670/680
Service Instructions
IMPORTANT
READ CAREFULLY BEFORE USE
KEEP FOR FUTURE REFERENCE
All rights reserved.
Property of Dürkopp Adler AG and protected by copyright. Any reuse of these contents,
including extracts, is prohibited without the prior written approval of Dürkopp Adler AG.
Copyright © Dürkopp Adler AG 2017
Table of contents
1 About these instructions ...........................................................5
1.1 For whom are these instructions intended?.................................. 5
1.2 Representation conventions – symbols and characters...............5
1.3 Other documents..........................................................................7
1.4 Liability..........................................................................................7
2 Safety...........................................................................................9
2.1 Basic safety instructions...............................................................9
2.2 Signal words and symbols used in warnings..............................10
3 Working basis........................................................................... 13
3.1 Order of the settings...................................................................13
3.2 Laying the cable guide................................................................13
3.3 Gages.........................................................................................14
3.4 Removing the covers..................................................................16
3.4.1 Access to the underside of the machine.....................................16
3.4.2 Removing the arm cover ............................................................17
3.4.3 Removing the head cover...........................................................17
3.4.4 Removing the valve cover..........................................................18
3.4.5 Removing the rear cover............................................................19
3.5 Flats on shafts ............................................................................19
3.6 Locking the machine in place.....................................................20
3.7 Setting the handwheel into position............................................22
4 Setting the handwheel scale ...................................................23
5 Positioning the arm shaft.........................................................24
6 Positioning the toothed belt wheels....................................... 25
6.1 Positioning the upper toothed belt wheel....................................25
6.2 Positioning the lower toothed belt wheel....................................26
7 Stitch length adjusting wheels................................................28
7.1 Setting the upper stitch length adjusting wheel..........................28
7.2 Setting the lower stitch length adjusting wheel...........................31
7.3 Setting the stitch length limit.......................................................32
7.4 Setting the eccentric for the forward and backward stitches...... 33
7.5 Setting the feed dog bar.............................................................34
7.6 Setting the initial position of the feed gear..................................35
8 Needle bar linkage....................................................................37
8.1 Aligning the needle bar linkage sideways...................................37
8.2 Setting transmission lever ..........................................................39
8.3 Setting the thread lever ..............................................................40
9 Post bed feed............................................................................ 41
9.1 Aligning the post bed feed.......................................................... 41
9.2 Setting the feed dog feed movement..........................................43
9.3 Setting the feed dog stroke movement.......................................44
9.4 Setting the feed dog height.........................................................45
9.5 Setting the compensating weight................................................46
9.6 Setting the needle penetration in the feed direction...................47
Service Instructions 670/680 - 00.0 - 07/2017 1
Table of contents
10 Position of the hook and needle .............................................48
10.1 Setting the hook height...............................................................48
10.2 Setting the loop stroke................................................................49
10.3 Setting the needle bar height......................................................50
10.4 Setting the hook side clearance .................................................51
10.5 Setting the needle guard ............................................................52
11 Setting the bobbin case lifter ..................................................53
11.1 Setting the lifting gap..................................................................53
11.2 Setting the timing for opening.....................................................54
12 Sewing feet................................................................................55
12.1 Setting the initial position of the lifting gear................................56
12.2 Setting an even sewing foot stroke.............................................57
12.3 Setting the stroke movement for the feeding foot.......................58
12.4 Setting the sewing foot pressure................................................59
12.5 Setting the sewing foot lifting height...........................................60
12.5.1 Setting the mechanical sewing foot lifting...................................60
12.5.2 Setting the sewing foot lifting height...........................................62
13 Setting the needle thread tension...........................................64
14 Winder .......................................................................................66
14.1 Setting the winder.......................................................................66
14.2 Setting the hook thread guide.....................................................69
15 Thread cutter............................................................................. 70
15.1 Setting the height of the thread-pulling knife..............................71
15.2 Setting the cutoff curve...............................................................72
15.3 Setting the swivel range of the thread-pulling knife.................... 73
15.4 Setting the cutting pressure........................................................74
15.5 Setting the hook thread clamp....................................................75
15.6 Setting point in time for cutting...................................................76
16 Setting the potentiometer........................................................ 77
17 Edge cutter (only 680).............................................................. 79
17.1 Assembling and setting the blade...............................................80
17.1.1 Assembling the counter blade ....................................................80
17.1.2 Assembling and setting the movable blade................................80
17.1.3 Setting the cutting pressure and blade position..........................82
17.2 Setting the timing of the blade stroke movement ....................... 83
17.3 Setting the stroke height of the blade.........................................84
18 Stitch loosening unit................................................................ 85
18.1 Setting the swivel movement timing...........................................86
18.2 Setting the position of the swivel movement ..............................88
18.3 Setting the height of the stitch loosening finger..........................89
18.4 Setting the height stop for the stitch loosening unit....................90
18.5 Setting the drive ratio of the stitch loosening
finger when raising the sewing foot:...........................................91
19 Setting the automatic material thickness detection.............. 92
2 Service Instructions 670/680 - 00.0 - 07/2017
Table of contents
20 Programming ............................................................................95
21 Maintenance............................................................................101
21.1 Cleaning ...................................................................................102
21.2 Lubricating................................................................................104
21.3 Servicing the pneumatic system...............................................106
21.3.1 Setting the operating pressure .................................................106
21.3.2 Draining the water condensation..............................................107
21.3.3 Cleaning the filter element........................................................108
21.4 Lubricating movable bolt on the edge cutter device.................109
21.5 Parts list....................................................................................109
22 Decommissioning...................................................................111
23 Disposal...................................................................................113
24 Troubleshooting .....................................................................115
24.1 Customer Service.....................................................................115
24.2 Messages of the software.........................................................115
24.3 Errors in sewing process ..........................................................121
25 Technical data.........................................................................123
26 Appendix .................................................................................125
Service Instructions 670/680 - 00.0 - 07/2017 3
Table of contents
4 Service Instructions 670/680 - 00.0 - 07/2017
About these instructions
1 About these instructions
These instructions have been prepared with utmost care. They contain information and notes intended to ensure long-term and reliable operation.
Should you notice any discrepancies or if you have improvement requests,
then we would be glad to receive your feedback through Customer
Service ( p. 115).
Consider the instructions part of the product and store them in a place
where they are readily available.
1.1 For whom are these instructions intended?
These instructions are intended for:
With regard to minimum qualification and other requirements to be met by
personnel, please also follow the chapter Safety ( p. 9).
• Specialists:
This group has the appropriate technical training for performing
maintenance or repairing malfunctions.
1.2 Representation conventions – symbols and characters
Various information in these instructions is represented or highlighted by the
following characters in order to facilitate easy and quick understanding:
Proper setting
Specifies proper setting.
Disturbances
Specifies the disturbances that can occur from an incorrect setting.
Cover
Specifies which covers must be disassembled in order to access the components to be set.
Service Instructions 670/680 - 00.0 - 07/2017 5
About these instructions
1.
2.
…
•
Steps to be performed when operating the machine (sewing and
equipping)
Steps to be performed for service, maintenance, and installation
Steps to be performed via the software control panel
The individual steps are numbered:
First step
Second step
The steps must always be followed in the specified order.
Lists are marked by bullet points.
Result of performing an operation
Change to the machine or on the display/control panel.
Important
Special attention must be paid to this point when performing a step.
Information
Additional information, e.g. on alternative operating options.
Order
Specifies the work to be performed before or after a setting.
References
Reference to another section in these instructions.
Safety Important warnings for the user of the machine are specifically marked.
Since safety is of particular importance, hazard symbols, levels of danger
and their signal words are described separately in the chapter Safety
( p. 9).
Location
information
If no other clear location information is used in a figure, indications of right
or left are always from the user's point of view.
6 Service Instructions 670/680 - 00.0 - 07/2017
About these instructions
1.3 Other documents
The machine includes components from other manufacturers. Each manufacturer has performed a hazard assessment for these purchased parts and
confirmed their design compliance with applicable European and national
regulations. The proper use of the built-in components is described in the
corresponding manufacturer's instructions.
1.4 Liability
All information and notes in these instructions have been compiled in
accordance with the latest technology and the applicable standards and
regulations.
Dürkopp Adler cannot be held liable for any damage resulting from:
• Breakage and damage during transport
• Failure to observe these instructions
• Improper use
• Unauthorized modifications to the machine
• Use of untrained personnel
• Use of unapproved parts
Transport
Dürkopp Adler cannot be held liable for breakage and transport damages.
Inspect the delivery immediately upon receiving it. Report any damage
to the last transport manager. This also applies if the packaging is not
damaged.
Leave machines, equipment and packaging material in the condition in
which they were found when the damage was discovered. This will ensure
any claims against the transport company.
Report all other complaints to Dürkopp Adler immediately after receiving
the product.
Service Instructions 670/680 - 00.0 - 07/2017 7
About these instructions
8 Service Instructions 670/680 - 00.0 - 07/2017
Safety
2 Safety
This chapter contains basic information for your safety. Read the instructions carefully before setting up or operating the machine. Make sure to
follow the information included in the safety instructions. Failure to do so
can result in serious injury and property damage.
2.1 Basic safety instructions
The machine may only be used as described in these instructions.
These instructions must be available at the machine's location at all times.
Work on live components and equipment is prohibited. Exceptions are
defined in the DIN VDE 0105.
For the following work, switch off the machine at the main switch or
disconnect the power plug:
• Replacing the needle or other sewing tools
• Leaving the workstation
• Performing maintenance work and repairs
• Threading
Missing or faulty parts could impair safety and damage the machine.
Only use original parts from the manufacturer.
Transport Use a lifting carriage or forklift to transport the machine. Raise the
machine max. 20 mm and secure it to prevent it from slipping off.
Setup The connecting cable must have a power plug approved in the relevant
country. The power plug may only be assembled to the power cable by
qualified specialists.
Obligations
of the operator
Follow the country-specific safety and accident prevention regulations and
the legal regulations concerning industrial safety and the protection of the
environment.
All the warnings and safety signs on the machine must always be in legible
condition. Do not remove!
Missing or damaged warnings and safety signs must be replaced
immediately.
Requirements
to be met by
the personnel
Only qualified specialists may:
• set up the machine
• perform maintenance work and repairs
• perform work on electrical equipment
Only authorized persons may work on the machine and must first have
understood these instructions.
Service Instructions 670/680 - 00.0 - 07/2017 9
Safety
Operation Check the machine during operating for any externally visible damage.
Stop working if you notice any changes to the machine. Report any changes
to your supervisor. Do not use a damaged machine any further.
Safety
equipment
Safety equipment should not be removed or deactivated. If it is essential
to remove or deactivate safety equipment for a repair operation, it must be
assembled and put back into operation immediately afterward.
2.2 Signal words and symbols used in warnings
Warnings in the text are distinguished by color bars. The color scheme is
based on the severity of the danger. Signal words indicate the severity of
the danger.
Signal words Signal words and the hazard they describe:
Signal word Meaning
DANGER (with hazard symbol)
If ignored, fatal or serious injury will result
WARNING (with hazard symbol)
If ignored, fatal or serious injury can result
CAUTION (with hazard symbol)
If ignored, moderate or minor injury can result
CAUTION (with hazard symbol)
If ignored, environmental damage can result
NOTICE (without hazard symbol)
If ignored, property damage can result
Symbols The following symbols indicate the type of danger to personnel:
Symbol Type of danger
General
Electric shock
10 Service Instructions 670/680 - 00.0 - 07/2017
Safety
Symbol Type of danger
Puncture
Crushing
Environmental damage
Examples Examples of the layout of warnings in the text:
DANGER
Type and source of danger!
Consequences of non-compliance.
Measures for avoiding the danger.
This is what a warning looks like for a hazard that will result in serious
injury or even death if ignored.
WARNING
Type and source of danger!
Consequences of non-compliance.
Measures for avoiding the danger.
This is what a warning looks like for a hazard that could result in
serious or even fatal injury if ignored.
CAUTION
Type and source of danger!
Consequences of non-compliance.
Measures for avoiding the danger.
This is what a warning looks like for a hazard that could result in
moderate or minor injury if the warning is ignored.
Service Instructions 670/680 - 00.0 - 07/2017 11
Safety
CAUTION
Type and source of danger!
Consequences of non-compliance.
Measures for avoiding the danger.
This is what a warning looks like for a hazard that could result in
environmental damage if ignored.
NOTICE
Type and source of danger!
Consequences of non-compliance.
Measures for avoiding the danger.
This is what a warning looks like for a hazard that could result in pro-
perty damage if ignored.
12 Service Instructions 670/680 - 00.0 - 07/2017
Working basis
3 Working basis
3.1 Order of the settings
Order
The setting positions for the machine are interdependent.
Always comply with the order of individual setting steps as specified.
It is absolutely essential that you follow all notices regarding prerequisites
and subsequent settings that are marked with in the margin.
NOTICE
Property damage may occur!
Risk of machine damage from incorrect order.
It is essential to follow the working order specified in these
instructions.
3.2 Laying the cable guide
Ensure that all cables are laid in the machine such that the function of moving parts is not hampered.
To lay the cable guide:
1. Lay any excess cabling neatly in proper cable snakes.
2. Bind together the cable loops with cable ties.
Important
Tie loops wherever possible to fixed parts.
The cables must be secured firmly.
3. Cut off any overlapping cable ties.
NOTICE
Property damage may occur!
Excess cables can impair the functioning of moving machine parts.
This impairs the sewing function and can result in damage.
Lay excess cable as described above.
Service Instructions 670/680 - 00.0 - 07/2017 13
3.3 Gages
Working basis
Gage Reference
Locking peg
• Locking/unplugging the machine
Setting gage (0868 290113)
• Setting the needle bar linkage
Setting gage (0868 290153)
• Setting the post bed feed
Setting gage (0808 290163)
• Setting the post bed feed
Setting gage (0868 290184)
• Positioning the sliding shaft
14 Service Instructions 670/680 - 00.0 - 07/2017
Working basis
Gage Reference
Setting gage (0868 290020)
• Setting transmission lever
Setting gage (0868 290184)
• Setting the needle bar linkage
• Setting the post bed feed
Auxiliary gage (0667 295050)
• Setting the basic setting for
mechanical stitch adjustment
Service Instructions 670/680 - 00.0 - 07/2017 15
3.4 Removing the covers
WARNING
Risk of injury from moving parts!
Crushing possible.
Switch off the machine before removing covers.
WARNING
Risk of injury from sharp parts!
Punctures possible.
Switch off the machine before removing covers.
Working basis
For many settings, you will have to remove the machine covers first in
order to access the components.
This chapter describes how to remove and then assemble the individual
covers again. The text for each type of setting work then specifies only the
cover that needs to be removed at that particular time.
3.4.1 Access to the underside of the machine Cover
To access the components on the underside of the machine, swivel up the
machine head.
To tilt the machine head:
1. Tilt the machine head as far as it will go.
Do NOT tilt the machine on the control panel.
16 Service Instructions 670/680 - 00.0 - 07/2017
Working basis
①②
①
②
3.4.2 Removing the arm cover
Abb. 1: Removing the arm cover
(1) - Arm cover (2) - Screws
To remove the arm cover:
1. Loosen the screws (2).
2. Remove the arm cover (1).
3.4.3 Removing the head cover
Abb. 2: Removing the head cover
(1) - Head cover (2) - Screws
Service Instructions 670/680 - 00.0 - 07/2017 17
Working basis
①
②
To remove the head cover:
1. Loosen the screws (2).
2. Remove the head cover (1).
3.4.4 Removing the valve cover
Important
When removing and placing the valve cover, be sure not to pull off any
cables.
Abb. 3: Removing the valve cover
(1) - Screws (2) - Valve cover
To remove the valve cover:
1. Loosen the screws (1).
2. Remove the valve co ver (2).
18 Service Instructions 670/680 - 00.0 - 07/2017
Working basis
①
②
①②
3.4.5 Removing the rear cover
Abb. 4: Removing the rear cover
(1) - Rear cover (2) - Screws
To remove the rear cover:
1. Loosen the screws (2).
2. Remove the rear cover (1).
3.5 Flats on shafts
Abb. 5: Flats on shafts
(1) - Flat (2) - Shaft
Some shafts have flat surfaces at the points where the components are
screwed on. This stabilizes the connection and makes setting easier.
For all settings on the surface, the first screw is screwed in rotational
direction onto the surface.
Service Instructions 670/680 - 00.0 - 07/2017 19
Working basis
①②③
Important
Always ensure that the screw faces are completely flush with the surface.
3.6 Locking the machine in place
Abb. 6: Locking the machine in place (1)
(1) - Large arresting groove
(2) - Small arresting groove
(3) - Locking peg
For some settings, the machine must be locked in place. To do this, the
locking peg (3) from the accessory pack is inserted into a slot on the arm
shaft crank, blocking the arm shaft.
There are 2 securing positions:
• Position 1: Loop stroke position
• 5 mm end in the large arresting groove (1)
• Setting the loop stroke and needle bar height
• Position 2: Handwheel zero position
• 3 mm end in the small arresting groove (2)
• Setting the handwheel position and checking the top dead center
for the needle bar
20 Service Instructions 670/680 - 00.0 - 07/2017
Working basis
④
Abb. 7: Locking the machine in place (2)
(4) - Locking opening
Locking the machine in place
To lock the machine in place:
1. Remove the plug from the locking opening (4).
2. Turn the handwheel until the appropriate arresting groove (1) or (2) is
in front of the locking opening (4):
• Small arresting groove (2) at handwheel position 0°
• Large arresting groove (1) at handwheel position 203°
3. Insert the locking peg (3) with the appropriate end into arresting
groove (1) or (2).
Removing the lock
To remove the lock:
1. Pull the locking peg (3) out of arresting groove (1) or (2).
2. Insert the plug into the locking opening (4).
Service Instructions 670/680 - 00.0 - 07/2017 21
3.7 Setting the handwheel into position
①
②
Abb. 8: Setting the handwheel into position
(1) - Graduated scale (2) - Marking
Working basis
For some settings, the graduated scale (1) on the handwheel has to be
moved to a certain position.
To set the handwheel into position:
1. Turn the handwheel until the specified number on the graduated
scale (1) is next to the marking (2).
22 Service Instructions 670/680 - 00.0 - 07/2017
Setting the handwheel scale
①
②
③
4 Setting the handwheel scale
Proper setting
1. Lock the machine in place at position 2 ( p. 20).
The handwheel is at position 0°.
If a different degree number is next to the marking, then you will have
to reset the graduated scale.
Abb. 9: Setting the handwheel scale
(1) - Slot
(2) - Marking
To set the handwheel scale:
1. Lock the machine in place at position 2 ( p. 20).
2. Loosen the fastening screw for the handwheel through the slot (1).
3. Turn the handwheel so that the marking (2) points to the degree number
0° on the handwheel scale (3).
4. Tighten the fastening screw.
5. Turn the handwheel to 50° and tighten the 2nd the fastening screw.
(3) - Handwheel scale
Service Instructions 670/680 - 00.0 - 07/2017 23
5 Positioning the arm shaft
①
②
③
WARNING
Risk of injury from moving parts!
Crushing possible.
Switch off the machine before you check and set
the position of the arm shaft crank.
Abb. 10: Positioning the arm shaft
Positioning the arm shaft
(1) - Threaded pins
(2) - Machine casting
Proper setting
The 3 threaded pins (1) on the arm shaft crank (3) are seated completely
on the flat. The arm shaft crank (3) is flush with the machine casting (2).
To position the arm shaft:
1. Remove the arm cover ( p. 17).
2. Loosen the threaded pins (1).
3. Turn the arm shaft crank (3) such that the threaded pins (1) are seated
completely on the flat of the arm shaft.
4. Push the arm shaft (3) to the right as far as it will go and flush with the
machine casting.
5. Tighten the threaded pins (1).
(3) - Arm shaft crank
24 Service Instructions 670/680 - 00.0 - 07/2017
Positioning the toothed belt wheels
⑤
①
②
③④
6 Positioning the toothed belt wheels
Proper setting
The two toothed belt wheels must be positioned above each other so that
the toothed belt can run correctly. The winder wheel is directly next to the
upper toothed belt wheel and determines its alignment.
Important
WARNING
Risk of injury from moving parts!
Crushing possible.
Switch off the machine before positioning the
toothed belt wheels.
The position of the upper toothed belt wheel is defined by the distance to
the winder wheel.
Therefore, you must first align the upper toothed belt wheel on the winde r
wheel and then align the lower toothed belt wheel so that the toothed belt
runs correctly over both wheels.
6.1 Positioning the upper toothed belt wheel
Abb. 11: Positioning the upper toothed belt wheel
(1) - Upper toothed belt wheel
(2) - Threaded pins
(3) - Winder wheel
(4) - Toothed belt
(5) - Flat of arm shaft
Service Instructions 670/680 - 00.0 - 07/2017 25
Positioning the toothed belt wheels
①
②
④
③
Proper setting
The 2 threaded pins (2) for the upper toothed belt wheel (1) are seated
flush on the arm shaft (5).
The distance between the winder wheel (3) and the upper toothed belt
wheel (1) must be 0.8 mm.
The toothed belt (4) runs correctly without running against the retaining
ring or slipping off.
To position the upper toothed belt wheel:
1. Remove the arm cover ( p. 17).
2. Push the toothed belt (4) sufficiently far to the side so that the 2 threaded
pins (2) can be reached.
3. Loosen the threaded pins (2).
4. Turn the upper toothed belt wheel (1) so that the threaded pins (2) are
seated flush on the flat of the arm shaft (5).
5. Move the upper toothed belt wheel (1) to the side so that the distance
to the winder wheel (3) is 0.8 mm.
6. Tighten the threaded pins (2).
7. Push the toothed belt (4) back.
6.2 Positioning the lower toothed belt wheel
Abb. 12: Positioning the lower toothed belt wheel
(1) - Toothed belt
(2) - Retaining ring
(3) - Lower toothed belt wheel
(4) - Threaded pins
Proper setting
The 2 threaded pins for the lower toothed belt wheel (3) are seated flush
on the flat of the lower shaft.
The toothed belt (1) runs correctly without running against the retaining
ring (2) or slipping off.
26 Service Instructions 670/680 - 00.0 - 07/2017
Positioning the toothed belt wheels
To position the lower toothed belt wheel:
1. Tilt the machine head ( p. 16).
2. Loosen the threaded pins (4).
3. Turn the lower toothed belt wheel (3) such that the threaded pins (4)
are seated on the flat of the arm shaft.
4. Move the lower toothed belt wheel (3) sufficiently far to the side so that
the toothed belt (1) makes contact with the retaining ring (2) without
being pushed away.
5. Tighten the threaded pins (4).
Service Instructions 670/680 - 00.0 - 07/2017 27
Stitch length adjusting wheels
①
②
⑥⑤
③
④
7 Stitch length adjusting wheels
WARNING
Risk of injury from moving parts!
Crushing possible.
Switch off the machine before you set the bottom
feed and the stitch regulator gear.
7.1 Setting the upper stitch length adjusting wheel
Abb. 13: Setting the upper stitch length adjusting wheel (1)
(1) - Spring (2) - Lever
Abb. 14: Setting the upper stitch length adjusting wheel (2)
(3) - Upper stitch length adjusting wheel
(4) - Screw
(5) - Shaft
(6) - Auxiliary gage (0667 295050)
28 Service Instructions 670/680 - 00.0 - 07/2017
Stitch length adjusting wheels
Proper setting
If the upper stitch length adjusting wheel (5) is set to 0, the stitch regulator
gear should not have any play.
To set the basic setting of the stitch adjustment:
1. Tilt the machine head ( p. 16).
2. Remove the spring (1).
3. Hold the upper stitch length adjusting wheel (3) in place with an auxiliary
gage (6).
4. Unscrew screw (4) and remove the upper stitch length adjusting
wheel (3).
5. Use a size 10 wrench to turn the shaft (5) so far to the right until the
lever (2) no longer has any play.
NOTICE
Property damage may occur!
Risk of breakage.
The stitch regulator parts may get stuck, resulting in the maximum
stitch length no longer being achieved.
Do not turn the shaft too far to the right.
6. Turn the scale of the upper stitch length adjusting wheel (3) to 0.
7. Place the upper stitch length adjusting wheel (3) again.
8. Tighten the screw (4).
9. Attach the spring (1) again.
10. Check the play of the lever (2).
Service Instructions 670/680 - 00.0 - 07/2017 29
Setting the eccentric
②
③
④
②
④
①
Abb. 15: Setting the eccentric
Stitch length adjusting wheels
(1) - Hole
(2) - Screw
Proper setting
The eccentric (4) must be set so that the open side (3) of the eccentric slot
is in line with the screw (2).
To set the eccentric:
1. Loosen the screw (2).
2. Turn the eccentric (4) through the hole (1) so that the open side ( 3) of
the eccentric slot is in line with the screw (2).
3. Tighten the screw (2).
(3) - Open side
(4) - Eccentric
30 Service Instructions 670/680 - 00.0 - 07/2017
Stitch length adjusting wheels
⑤
①
②
③
④
7.2 Setting the lower stitch length adjusting wheel
Abb. 16: Setting the lower stitch length adjusting wheel
(1) - Upper stitch length adjusting wheel
(2) - Scale
(3) - Lower stitch length adjusting wheel
To set the second stitch length:
1. Position the upper stitch length adjusting wheel (1) to 0.
2. Unscrew the screw (4).
3. Remove the lower stitch length adjusting wheel (3).
4. Use a size 10 wrench to turn the shaft (5) clockwise as far as it will go.
5. Turn scale (2) to 0.
6. Place the lower stitch length adjusting wheel (3) again.
7. Tighten the screw (4).
(4) - Screw
(5) - Shaft
Service Instructions 670/680 - 00.0 - 07/2017 31
Stitch length adjusting wheels
①
②
③
7.3 Setting the stitch length limit
If not all of the stitch lengths are available during sewing operation, a limit
can be placed on the maximum stitch length that can be set.
12, 9, or 6 mm can be selected as the maximum stitch length.
Abb. 17: Setting the stitch length limit
(1) - Upper stitch length adjusting wheel
(2) - Screw
To set the stitch length limit:
1. Position the upper stitch length adjusting wheel (1) to 0.
2. Hold the upper stitch length adjusting wheel (1) in place using a wrench.
3. Loosen the screw (2).
4. Remove the upper stitch length adjusting wheel (1).
5. Loosen the threaded pin from one of the 3 mark-off openings.
6. Screw the threaded pin into the mark-off opening for the required
maximum stitch length.
The slots are marked with numbers for the stitch length.
7. Turn the scale so that the 0 is exactly next to the adjusting mark.
8. Fit the upper stitch length adjusting wheel (1) and hold it in place using
a wrench.
9. Tighten the screw (2).
(3) - Mark-off slots
32 Service Instructions 670/680 - 00.0 - 07/2017
Stitch length adjusting wheels
①②
②
①
7.4 Setting the eccentric for the forward and backward stitches
Abb. 18: Setting the eccentric for the forward and backward stitches
(1) - Screw (2) - Eccentric
Proper setting
The forward and backward stitches are the same length.
As a test, sew a seam forward, stop, and sew a seam backward.
The insertions of the forward and backward stitches have to lie within one
another.
To set the eccentric for forward and backward stitches:
1. Tilt the machine head ( p. 16).
2. Loosen the screw (1).
3. Turn the eccentric (2) through the hole.
• Turn clockwise: the forward stitch becomes larger, the backward
stitch smaller
• Turn counterclockwise: the forward stitch becomes smaller, the
backward stitch larger.
4. Tighten the screw (1).
5. As a test, sew a seam forward, stop, and sew a seam backward.
The punctures of the forward and backward stitches have to lie within
one another.
If the punctures for forward and backward stitches do not lie within
one another, correct the setting.
Service Instructions 670/680 - 00.0 - 07/2017 33
7.5 Setting the feed dog bar
①
②③ ④ ⑤ ⑥ ④
⑩⑪
⑧
⑧
⑨
⑦
Abb. 19: Setting the feed dog bar (1).
Stitch length adjusting wheels
(1) - Lever
(2) - Adjusting ring
(3) - Adjusting ring
To set the feed dog bar:
1. Loosen the post bed feed ( p. 41).
2. Loosen the threaded pins on the adjusting rings (2) and (3).
3. Loosen the clamping screw on the lever (5).
4. Loosen the screws on levers (1) and (6).
Abb. 20: Setting the feed dog bar (2).
(4) - Shaft
(5) - Lever
(6) - Lever
(7) - Gage (0868 290184)
(8) - Screws
(9) - Feed dog bar
5. Screw the holder (11) onto the feed dog bar (9).
(10) - Bolt
(11) - Holder
34 Service Instructions 670/680 - 00.0 - 07/2017
Stitch length adjusting wheels
⑥⑦ ⑧ ③
⑨
⑩
②
①
③
④⑤
6. Screw the gage (7) onto the base plate.
7. Use the bolt (10) to connect the holder (11) and the gage (7).
8. Align the feed dog bar (9) to the holder (11).
9. Tighten the screws (8).
10. Tighten the shaft (4) with the adjusting rings (2) and (3) and tighten
the screws.
11. Set the stitch length to 0.
12. Tighten the clamping screw on the lever (5).
13. Position the needle bar with the gage ( p. 37).
14. Tighten the screws on the lever (6).
15. Tighten the screws on the lever (1).
16. Loosen the gage (7).
7.6 Setting the initial position of the feed gear
Abb. 21: Setting the initial position of the feed gear (1)
(1) - Spring
(2) - Bearing bolt
(3) - Shaft
(4) - Block
(5) - Screws
Service Instructions 670/680 - 00.0 - 07/2017 35
(6) - Adjusting frame
(7) - Adjusting ring
(8) - Shaft
(9) - Block
(10) - Screw
Stitch length adjusting wheels
To set the initial position of the feed gear:
1. Remove the spring (1).
2. Loosen the clamping screws on the blocks (4) and (9).
3. Loosen the screw (10).
4. Align the adjusting frame (6) sideways so that it sits in the center of
the cutouts in the shaft (3).
5. Tighten the adjusting frame (6) axially with the bearing bolt (2) and
adjusting ring (7).
6. Position the upper stitch length adjusting wheel to 0.
7. Turn the adjusting frame (6) so that the plates are parallel.
8. Tighten the clamping screws on the blocks (4) and (9).
9. Attach the spring (1) again.
Information
The shaft (8) is fixed in the adjusting frame (6) with the screws (5).
36 Service Instructions 670/680 - 00.0 - 07/2017
Needle bar linkage
④⑤
①②③
8 Needle bar linkage
WARNING
Risk of injury from moving parts!
Crushing possible.
Switch off the machine before you check and set
the needle bar linkage.
8.1 Aligning the needle bar linkage sideways
NOTICE
Property damage may occur!
Risk of breakage.
After setting the needle bar linkage, check the distance between the
hook tip and the needle and correct it if necessary.
Abb. 22: Aligning the needle bar linkage sideways (1)
(1) - Adjusting ring
(2) - Adjusting ring
(3) - Spring guide
(4) - Socket
(5) - Feeding foot bar
To align the needle bar linkage sideways:
1. Remove the arm cover ( p. 17).
2. Remove the head cover ( p. 17).
3. Loosen the screws on the adjusting rings (1) and (2).
4. Disassemble the spring guide (3) and socket (4).
5. Disassemble the feeding foot bar (5).
Service Instructions 670/680 - 00.0 - 07/2017 37
Needle bar linkage
⑥
⑦
Abb. 23: Aligning the needle bar linkage sideways (2)
(6) - Gage (0686 290113) (7) - Needle bar
6. Use the gage (6) as illustrated above.
7. Insert the needle bar (7) without the needle block and thread guide into
the hole of the gage (6).
8. Tighten the adjusting rings (1) and (2) and screws.
9. Disassemble the gage (6).
10. Re-assemble the spring guide (3), feeding foot bar (5) and socket (1).
Order
Then check the following setting:
• Distance between the hook tip and needle ( p. 51)
38 Service Instructions 670/680 - 00.0 - 07/2017
Needle bar linkage
⑤⑥
①
②
③
④
8.2 Setting transmission lever
Abb. 24: Setting transmission lever (1)
(1) - Clamping screw
(2) - Lever
(3) - Bolt
The lever (5) transmits the movement of the feed shaft to the needle bar
linkage.
To set the transmission lever:
1. Remove the head cover ( p. 17).
2. Position the upper stitch length adjusting wheel to 0.
3. Loosen the thrust bolts on the lever (5).
4. Fit gage (4) to the bolt (3) and press it down as far as it will go.
5. Loosen the clamping screw (1) on the lever (2).
6. Position the needle bar linkage with the gage (6).
7. Tighten the clamping screw (1).
8. Tighten the thrust bolts on the lever (5).
9. Disassemble the gages (6) and (4).
(4) - Gage (0868 290020)
(5) - Lever
(6) - Gage (0868 290194)
Service Instructions 670/680 - 00.0 - 07/2017 39
8.3 Setting the thread lever
①② ② ①
AB
Abb. 25: Setting the thread lever
(1) - Threaded pins (2) - Pull rod
To set the thread lever:
Needle bar linkage
1. Loosen the screws (1).
2. Align the thread lever sideways so that the play of the pull rod (2) on
the crosshead is the same at positions A and B.
3. Tighten the threaded pins (1).
40 Service Instructions 670/680 - 00.0 - 07/2017
Post bed feed
①
9 Post bed feed
WARNING
Risk of injury from moving parts!
Crushing possible.
Make sure the machine is switched off before
checking and setting the post bed feed.
9.1 Aligning the post bed feed
Abb. 26: Aligning the post bed feed (1)
(1) - Gage (0868 290194)
To align the post bed feed:
1. Tilt the machine head ( p. 16).
2. Position the upper stitch length adjusting wheel to 0.
3. Position the needle bar linkage with the gage (1).
Service Instructions 670/680 - 00.0 - 07/2017 41
Abb. 27: Aligning the post bed feed (2)
②
③
④
⑤
⑥
⑦
⑧
⑩
⑪
⑫
⑨
⑬
⑨
Post bed feed
(2) - Holder
(3) - Bolt
(4) - Thrust bolt
4. Loosen the screws on the levers (5) and (7).
5. Loosen the clamping screw on the lever (6).
Abb. 28: Aligning the post bed feed (3)
(5) - Lever
(6) - Lever
(7) - Lever
(8) - Feed dog lever
(9) - Screws
(10) - Gage (0868 290153)
6. Screw the post bed feed (13) onto the base plate (12).
7. Use the bolt (3) to connect the post bed feed (13) to the holder (2).
8. Turn the handwheel into the 180° position.
The needle bar is at the bottom dead center.
The needle plunges into the needle hole.
9. Insert the gage (10) into the post bed feed (13).
10. Slide the feed dog lever (8) up as far as it will go.
11. Align the post bed feed (13) to the needle and the gage (11).
12. Tighten the screws (9).
(11) - Gage (0868 290163)
(12) - Base plate
(13) - Post bed feed
42 Service Instructions 670/680 - 00.0 - 07/2017
Post bed feed
①
13. Fix the bolt (3) in place using the thrust bolt (4).
14. Tighten the screws on the levers (5) and (7).
In doing so, note the feed dog height ( p. 45).
15. Tighten the clamping screw on the lever (6).
16. Disassemble the gages (1), (10) and (11).
9.2 Setting the feed dog feed movement
Abb. 29: Setting the feed dog feed movement
(1) - Pusher eccentric
Proper setting
At handwheel position 180°, the feed dog must move as little as possible
when the largest stitch length is set.
1. Set the largest stitch length.
2. Move the handwheel into the 180° position.
3. Move the stitch adjustment lever and check the feed dog movement.
To set the feed dog feed movement:
1. Tilt the machine head ( p. 16).
2. Loosen the screws on the pusher eccentric (1).
3. Set the pusher eccentric (1).
4. Tighten the screws on the pusher eccentric (1).
5. Move the stitch adjustment lever and check the feed dog movement.
Service Instructions 670/680 - 00.0 - 07/2017 43
9.3 Setting the feed dog stroke movement
①
Abb. 30: Setting the feed dog stroke movement
(1) - Stroke eccentric
Post bed feed
Proper setting
The feed dog has the same height to the throat plate at the front and rear
dead center.
To set the feed dog stroke movement:
1. Tilt the machine head ( p. 16).
2. Loosen the screws on the stroke eccentric (1).
3. Turn the stroke eccentric (1).
4. Tighten the screws on the stroke eccentric (1).
5. Turn the handwheel and check the feed dog movement.
44 Service Instructions 670/680 - 00.0 - 07/2017
Post bed feed
①②
9.4 Setting the feed dog height
Abb. 31: Setting the feed dog height
(1) - Feed dog (2) - Lever
Proper setting
In its highest position, the feed dog must protrude 0.8 mm over the throat
plate.
To set the feed dog height:
1. Tilt the machine head ( p. 16).
2. Turn the handwheel until the feed dog (1) has reached its highest
position.
3. Loosen the screws on the lever (2).
4. Turn the lever (1) so that the feed dog (1) protrudes 0.8 mm over
the throat plate.
5. Tighten the screws on the lever (2).
Service Instructions 670/680 - 00.0 - 07/2017 45
9.5 Setting the compensating weight
①②③
Abb. 32: Setting the compensating weight
Post bed feed
(1) - Compensating weight
(2) - Hex key
(3) - Base plate
Proper setting
The compensating weight is such that an inserted hex key is parallel to the
base plate at handwheel position 30°.
To set the compensating weight:
1. Tilt the machine head ( p. 16).
2. Loosen the screws on the compensating weight (1).
3. Turn the compensating weight (1).
4. Insert the hex key (2) and check that it is parallel to the base plate (3).
5. Tighten the screws on the compensating weight (1).
46 Service Instructions 670/680 - 00.0 - 07/2017
Post bed feed
①
②
9.6 Setting the needle penetration in the feed direction
Abb. 33: Setting the needle penetration in the feed direction
(1) - Needle (2) - Feed dog
Proper setting
If the stitch length is 0, the needle penetrates the center of the needle hole
of the feed dog.
To set the needle penetration in the feed direction:
1. Set the stitch length to 0.
2. Insert the new needle.
3. Turn the handwheel and lower the needle bar.
4. Check the position of the needle in the needle hole.
5. If the needle does not penetrate the center of the needle hole, re-align
the post bed feed ( p. 41).
Service Instructions 670/680 - 00.0 - 07/2017 47
Position of the hook and needle
④
③②
①
⑤
10 Position of the hook and needle
WARNING
Risk of injury from moving parts!
Crushing possible.
Switch off the machine before you check and set
the position of the hook and needle.
NOTICE
Property damage may occur!
There is a risk of machine damage, needle breakage or damage
to the thread if the distance between needle groove and hook tip is
incorrect.
Check and, if necessary, reset the distance to the hook tip after
inserting a needle with a new size.
10.1 Setting the hook height
The hook height is adjusted to the movement of the thread lever.
The hook height is set at the factory to the dimension 4.7-
between the upper edge of the throat plate and the upper edge of the bobbin case nose).
The hook height must be reset after changing the hook shaft.
Abb. 34: Setting the hook height
(dimension
0.1
(1) - Hook
(2) - Screw
(3) - Retaining ring
(4) - Adjusting washers
(5) - Oil thrower washer
48 Service Instructions 670/680 - 00.0 - 07/2017
Position of the hook and needle
①③②
To set the hook height:
1. Measure the existing hook height.
2. Disassemble the hook (1).
3. Loosen the screw (2).
4. Pull the oil thrower washer (5) up and off.
5. Shim the corresponding number of adjusting washers (4).
6. Place the oil thrower washer (5).
7. Tighten the screw (2).
8. Assemble the hook (1).
10.2 Setting the loop stroke
Abb. 35: Set the loop stroke
(1) - Needle
(2) - Hook tip
(3) - Clamping ring
Proper setting
The loop stroke is 2 mm.
To set the loop stroke:
1. Lock the machine in place at position 1 ( p. 20).
2. Set the upper stitch length adjusting wheel to 0.
3. Tilt the machine head ( p. 16).
4. Loosen the screws on the clamping ring (3).
5. Turn the hook so that the hook tip (2) is at the center of the needle (1).
6. Tighten the screws on the clamping ring (3).
Service Instructions 670/680 - 00.0 - 07/2017 49
Order
①② ③④
Then check the following setting:
• Thread cutter cam ( p. 72)
10.3 Setting the needle bar height
Abb. 36: Setting the needle bar height
Position of the hook and needle
(1) - Screw
(2) - Needle bar
(3) - Groove
(4) - Hook tip
Proper setting
When the stitch length is set to 0, the hook tip is in the loop stroke position
in the lower third of the needle groove.
To set the needle bar height:
1. Remove the head cover ( p. 17).
2. Set the upper stitch length adjusting wheel to 0.
3. Loosen the screw (2).
4. Move the needle bar (1) so that the hook tip (4) is in the lower third of
the needle groove (3).
When doing so, make sure that you do not turn the needle.
The groove (3) of the needle must face towards the hook tip (4).
5. Tighten the screw (2).
Order
Then check the following setting:
• Needle guard ( p. 52)
50 Service Instructions 670/680 - 00.0 - 07/2017
Position of the hook and needle
③
⑤
⑥
①
②
①
③
Max. 0.1 mm
④
10.4 Setting the hook side clearance
Abb. 37: Setting the hook side clearance
(1) - Threaded pins
(2) - Clamping ring
(3) - Screws
Proper setting
In the loop stroke position, the distance between the hook tip and the groove of the needle is no greater than 0.1 mm.
To set the hook side clearance:
1. Tilt the machine head ( p. 16).
2. Check whether the needle is pushed away by the needle guard (4) in
the loop stroke position.
If so: swivel down the needle guard.
3. Check the distance between the hook tip (6) and the gro ove (5) of the
needle.
The distance must not exceed 0.1 mm.
4. Loosen the screws (3).
5. Loosen the screws (1).
6. Move the hook housing sideways.
(4) - Needle guard
(5) - Groove
(6) - Hook tip
7. Set the loop stroke ( p. 49).
8. Tighten the screws (1).
9. Tighten the screws (3).
Service Instructions 670/680 - 00.0 - 07/2017 51
10.5 Setting the needle guard
①
②
Abb. 38: Setting the needle guard
Position of the hook and needle
(1) - Needle guard (2) - Screw
Proper setting
The machine is locked in place at position 1 ( p. 20).
The needle guard pushes the needle just enough away so that it
cannot be touched by the hook tip.
To set the needle guard:
1. Turn the handwheel and check how far the needle guard (1) pushes
the needle away.
2. Turn the screw (2) so that the needle guard (1) pushes the needle just
so far that the hook tip cannot touch it.
• To push away more forcefully: turn counterclockwise
• To push away less forcefully: turn clockwise
52 Service Instructions 670/680 - 00.0 - 07/2017
Setting the bobbin case lifter
④
①
②
①
②
④
③③
680 670
11 Setting the bobbin case lifter
1 1.1 Setting the lifting gap
Abb. 39: Setting the lifting gap
CAUTION
Risk of injury from moving parts!
Crushing possible.
Switch off the machine before setting the bobbin
case lifter.
(1) - Bobbin case nose
(2) - Bobbin case lifter
Proper setting
The bobbin case lifter (2) lifts the hook middle section (3) so far that the
needle thread can slip freely between the bobbin case nose (1) and the
throat plate slot.
To set the lifting gap:
1. Pull up the hook cover and pivot it.
2. Turn the handwheel until the bobbin case lifter (2) has reached its
highest lifting path.
3. Loosen the screw (4).
4. Set the bobbin case lifter (2) so that the bobbin case nose (1) is
positioned in the center of the throat plate cutout.
5. Tighten the screw (4).
(3) - Hook middle section
(4) - Screw
Service Instructions 670/680 - 00.0 - 07/2017 53
11.2 Setting the timing for opening
①
②
①
②
③
Abb. 40: Setting the timing for opening
Setting the bobbin case lifter
(1) - Bobbin case nose
(2) - Bobbin case lifter
(3) - Screw opening
Proper setting
When sewing, the needle thread must slip freely through the bobbin case
nose (1) and the bobbin case lifter (2).
To set the timing for opening:
1. Disassemble the hook cover.
2. Loosen the screw through the screw hole (3).
3. Move the handwheel into position.
• Class 670: 305°
• Class 680: 205°
4. Tighten the screw through the screw hole (3).
ü
54 Service Instructions 670/680 - 00.0 - 07/2017
Sewing feet
①
②③
12 Sewing feet
WARNING
Risk of injury from sharp and moving parts!
Puncture or crushing possible.
Switch off the machine before you set the sewing
feet.
NOTICE
Property damage may occur!
Machine can be damaged if the adjusting wheels are forced.
Do not attempt to use force to set a lower sewing foot stroke at the
right adjusting wheel.
Abb. 41: Sewing feet
(1) - Presser foot
(2) - Feeding foot
The 2 adjusting wheels (3) on the machine arm determine how high the
presser foot (1) and feeding foot (2) are raised when sewing.
The left adjusting wheel determines the normal sewing foot stroke.
The right adjusting wheel determines the increased sewing foot stroke.
The increased sewing foot stroke must NOT be lower than the norma l sewing foot stroke.
(3) - Adjusting wheels for the sewing
foot stroke
Service Instructions 670/680 - 00.0 - 07/2017 55
12.1 Setting the initial position of the lifting gear
①② ③④ ⑤
Abb. 42: Setting the initial position of the lifting gear
Sewing feet
(1) - Plates
(2) - Lifting gear
(3) - Screws
(4) - Screw
(5) - Cam
Proper setting
When the screw (4) is put away, the plates (1) of the lifting gear (2) are
parallel to each other.
To set the initial position of the lifting gear:
1. Remove the arm cover ( p. 17).
2. Turn the screw (4) so far that the cam (5) is free.
3. Loosen the screws (3).
4. Position the plates (1) so that they are parallel.
5. Tighten the screws (3).
56 Service Instructions 670/680 - 00.0 - 07/2017
Sewing feet
③
①
②
12.2 Setting an even sewing foot stroke
Abb. 43: Setting an even sewing foot stroke
(1) - Presser foot
(2) - Feeding foot
Proper setting
For sewing foot stroke 3, the presser foot and feeding foot are raised by
the same height.
To set an even sewing foot stroke:
1. Remove the arm cover ( p. 17).
2. Set the handwheel to position 0.
3. Loosen the screw (3).
4. Press the feeding foot (2) onto the throat plate.
5. Tighten the screw (3).
6. Place the arm cover.
7. Turn the adjusting wheel for the sewing foot stroke to 3.
8. Check whether the presser foot (1) and the feeding foot (2) are raised
to the same height and correct the setting if necessary.
(3) - Screw
Service Instructions 670/680 - 00.0 - 07/2017 57
Sewing feet
③
①
②
⑤
④
①
12.3 Setting the stroke movement for the feeding foot
Abb. 44: Setting the stroke movement for the feeding foot (1)
(1) - Feeding foot
(2) - Feed dog
Order
First, check the following setting:
• Even sewing foot stroke ( p. 57)
• The feed dog stroke movement ( p. 44)
Proper setting
The feeding foot (1) touches down exactly on the feed dog (2) when the
downward movement of the needle tip (3) reaches the upper edge of the
feeding foot. This occurs at handwheel position 95°.
Abb. 45: Setting the stroke movement for the feeding foot (2)
(3) - Needle tip
(1) - Feeding foot
(4) - Presser foot
58 Service Instructions 670/680 - 00.0 - 07/2017
(5) - Screws
Sewing feet
①
To set the stroke movement for the feeding foot:
1. Remove the arm cover ( p. 17).
2. Set the maximum stitch length.
3. Set the maximum sewing foot stroke.
4. Loosen the screws (5).
5. Turn the stroke eccentric.
When doing so, make sure that you do not move the stroke eccentric
axially.
6. Tighten the screws (5).
7. Check the setting and correct it if necessary.
12.4 Setting the sewing foot pressure
The adjusting wheel at the top left of the machine arm determines the
pressure for the sewing feet on the sewing material. The pressure can be
adjusted continuously by turning the adjusting wheel.
The correct pressure depends on the sewing material:
• Lower pressure for soft materials
• Higher pressure for durable materials
Abb. 46: Setting the sewing foot pressure
(1) - Adjusting wheel for the sewing
foot pressure
To set the sewing foot pressure:
1. Turn the adjusting wheel for the sewing foot pressure (1):
• Higher pressure: turn clockwise
• Lower pressure: turn counterclockwise
Service Instructions 670/680 - 00.0 - 07/2017 59
12.5 Setting the sewing foot lifting height
①②
③
①
CAUTION
Risk of injury from moving parts!
Crushing possible.
The machine must remain switched on so that
the sewing feet can be raised.
Exercise particular caution when setting the sewing
foot lifting height.
Do NOT place your hands under the sewing feet
when they are being lowered.
12.5.1 Setting the mechanical sewing foot lifting
Abb. 47: Setting the mechanical sewing foot lifting (1)
Sewing feet
(1) - Lifter lever
(2) - Spring guide
60 Service Instructions 670/680 - 00.0 - 07/2017
(3) - Lifter shaft
Sewing feet
⑥
⑤
④
Proper setting
The lifter shaft (3) must move smoothly, but must not have any axial play.
The play of the lifting mechanism should be approximately 0.5 mm between
the spring guide (2) and the lifter lever (1).
Abb. 48: Setting the mechanical sewing foot lifting (2)
(4) - Lifter block
(5) - Screw
To set the mechanical sewing foot lifting:
1. Remove the arm cover ( p. 17).
2. Remove the head cover ( p. 17).
3. Unscrew the electrical and pneumatic unit.
Tightening the lifter shaft
4. Loosen the screw (5).
5. Slide the lifter shaft (3) all the way to the right.
6. Slide the adjusting ring (6) onto the bearing bush.
7. Tighten the screw (5).
Make sure that the shaft can still run easily.
Setting the lifter shaft play
8. Loosen the screws on the lifter block (4).
9. Move the lifter shaft (3) until play exists.
10. Tighten the screws on the lifter block (4).
(6) - Adjusting ring
Service Instructions 670/680 - 00.0 - 07/2017 61
Sewing feet
②③
①
12.5.2 Setting the sewing foot lifting height
Setting the height of the sewing feet locked with the hand lever
Abb. 49: Setting the height of the sewing feet locked with the hand lever
(1) - Hand lever
(2) - Eccentric washer
(3) - Lifting lever
Proper setting
If the sewing feet are locked with the hand lever (1) in the raised position,
they should be at a distance of 10 mm to the throat plate.
To set the height of the sewing feet locked with the hand lever:
1. Remove the arm cover ( p. 17).
2. Lift sewing feet.
3. Place the distance piece (10 mm) under the sewing feet.
4. Loosen the screws on the lifting lever (3).
5. Push the hand lever (1) down.
6. Push the lifting lever (3) onto the eccentric washer (2).
7. Tighten the screws on the lifting lever (3).
62 Service Instructions 670/680 - 00.0 - 07/2017
Sewing feet
②
①
Setting the height of the pneumatically raised sewing feet
Abb. 50: Setting the height of the pneumatically raised sewing feet
(1) - Screw (2) - Counternut
Proper setting
If the sewing feet are raised pneumatically or via the knee button, they
should be at a distance of 20 mm to the throat plate.
To set the height of the pneumatically raised feet:
1. Lower the sewing feet.
2. Turn the handwheel until the needle bar is at the top dead center.
3. Raise the sewing feet pneumatically and measure the lifting height.
4. Loosen the counternut (2).
5. Turn the screw (1).
• Increase the lifting pressure: turn counterclockwise
• Reduce the lifting pressure: turn clockwise
6. Tighten the counternut (2).
Service Instructions 670/680 - 00.0 - 07/2017 63
Setting the needle thread tension
③
④
①
②
13 Setting the needle thread tension
CAUTION
Risk of injury from moving parts!
Crushing possible.
Switch off the machine before setting the needle
thread tension.
Setting the thread tension spring
Abb. 51: Setting the thread tension spring
(1) - Thread tension spring
(2) - Tension disk
The thread tension spring holds the needle thread under tension from the
top dead center of the thread lever up to the point when the needle eye
plunges into the sewing material.
Proper setting
The thread tension spring does not contact the stop until the needle eye
has plunged into the sewing material.
The setting for the thread tension spring must be varied according to the
sewing material and the required sewing result.
64 Service Instructions 670/680 - 00.0 - 07/2017
(3) - Screw
(4) - Stop collar
Setting the needle thread tension
To set the thread tension spring:
1. Loosen the screw (3).
2. Turn the stop collar (4) to set the spring travel.
• Longer spring travel: turn counterclockwise
• Shorter spring travel: turn clockwise
3. Turn the tension disk (2) to set the spring tension.
• Greater spring tension: turn counterclockwise
• Lower spring tension: turn clockwise
Important
Do not twist the stop collar in doing so.
4. Tighten the screw (3).
Service Instructions 670/680 - 00.0 - 07/2017 65
14 Winder
③
④
①
②
WARNING
Risk of injury from moving parts!
Crushing possible.
Switch off the machine before setting the winder.
14.1 Setting the winder
Setting the winder filling quantity
Abb. 52: Setting the winder filling quantity
Winder
(1) - Screws
(2) - Screw
Proper setting
The winder wheel runs smoothly and without axial play.
The winding process will stop automatically when the required filling
quantity of the bobbin is reached.
To set the winder filling quantity:
1. Remove the arm cover ( p. 17).
2. Loosen the screws (1).
3. Remove the winder.
66 Service Instructions 670/680 - 00.0 - 07/2017
(3) - Winder lever
(4) - Arm
Winder
⑥
③⑧
⑥
⑤
⑤⑨⑩
⑦
The position of the arms (4) on the winder lever (3) determines the filling
quantity:
• Arm (4) parallel: automatic winding stop at 0.5 mm below the edge
of the winder
• Arm (4) closer together: automatic winding stop with larger filling
quantity
• Arm (4) further apart from each other: automatic winding stop with
smaller filling quantity
4. Turn the screw (2):
• Arms (4) closer together: turn counterclockwise
• Arms (4) further apart from each other: turn clockwise
5. Put the completely filled bobbin onto the winder.
6. Fold the winder lever (3) upwards as far as it will go to the thread.
Setting the winder spacing
Abb. 53: Setting the winder spacing
(3) - Winder lever
(5) - Thread-pulling knife
(6) - Winder spindle
(7) - Right-hand screw hole
To set the winder spacing:
1. Turn the winder spindle (6) such that the thread-pulling knife (5) is at
the top right and is facing the right-hand screw hole (7).
2. Loosen the threaded pin in the block (8).
3. Set the winder lever (3) so that the distance between the thread on the
bobbin and the winder lever is 2-3 mm.
4. Set the block (8) such that it is resting against the locking disk (9).
5. Set the block (8) such that its distance to the winder wheel (10) is
0.5 mm.
6. Tighten the threaded pin in the block (8).
(8) - Block
(9) - Locking disk
(10) - Winder wheel
Service Instructions 670/680 - 00.0 - 07/2017 67
Setting the winder run
⑪⑫ ⑬ ⑭ ⑬
⑧
⑩
Abb. 54: Setting the winder run
Winder
(8) - Block
(10) - Winder wheel
(11) - Threaded pin
(12) - Threaded pin
(13) - Switch cam
(14) - Leaf spring
To set the winder run:
1. Loosen the threaded pin (12).
2. Set the switch cam (13) such that it is just contacting the leaf spring (14)
when the block (8) has engaged in the locking disk.
3. Set the switch cam (13) such that the winder lever (3) has no axial play.
4. Tighten the threaded pin (12).
5. Re-assemble the winder.
68 Service Instructions 670/680 - 00.0 - 07/2017
Winder
①②
14.2 Setting the hook thread guide
Abb. 55: Setting the hook thread guide
(1) - Screw (2) - Hook thread guide
The position of the hook thread guide determines how the hook thread is
wound onto the bobbin.
Proper setting
The hook thread is wound on evenly over the entire width of the bobbin.
To set the hook thread guide:
1. Loosen the screw (1).
2. Turn the hook thread guide (2):
• To the front: The hook thread will be wound on further to the front
• To the rear: The hook thread will be wound on further to the rear
Service Instructions 670/680 - 00.0 - 07/2017 69
15 Thread cutter
①
②
③
④
⑤
⑥
⑦
⑧
Abb. 56: Thread cutter
Thread cutter
WARNING
Risk of injury from sharp parts!
Cutting possible.
Switch off the machine before setting the thread
cutter.
(1) - Thread-pulling knife
(2) - Knife carrier
(3) - Screw
(4) - Shaft
(5) - Screw
(6) - Lever
(7) - Lever
(8) - Control cam
The thread-pulling knife (1) cannot be moved on the knife carrier (3).
The thread-pulling knife (1) can thus be replaced without having to reset
the cutting pressure.
The screws (3) and (5) are tightened to the surfaces on the shaft (4).
To avoid a collision, the lever (6) must be fitted with its short side on the
lever (7).
The control cam (8) is designed for operating with the XL hook and the
XXL hook.
70 Service Instructions 670/680 - 00.0 - 07/2017
Thread cutter
①
②
③
④
⑤
⑥
Important
The control cam (4) and clamping ring are both mutually used as a stop
and must not be loosened at the same time.
15.1 Setting the height of the thread-pulling knife
Abb. 57: Setting the height of the thread-pulling knife
(1) - Thread-pulling knife
(2) - Knife carrier
(3) - Screw
Proper setting
The thread-pulling knife (1) travels as close as possible to the bobbin (6).
The distance between the thread-pulling knife (1) and the bobbin (6) must
not exceed 0.1 mm.
To set the height of the thread-pulling knife:
1. Loosen the screws on the knife carrier (2).
2. Turn the screw (3) to set the height of the thread-pulling knife.
The distance between the thread-pulling knife (1) and the bobbin (6)
must not exceed 0.1 mm.
3. Tighten the screws on the knife carrier (2).
In doing so, ensure that the screw (4) is flush with the surface of the
shaft (5).
(4) - Screw
(5) - Shaft
(6) - Bobbin
Service Instructions 670/680 - 00.0 - 07/2017 71
15.2 Setting the cutoff curve
①⑥ ⑤④
③②
Max. 0.1 mm
Abb. 58: Setting the cutoff curve
Thread cutter
(1) - Lever
(2) - Clamping ring
(3) - Control cam
(4) - Counter blade
(5) - Thread-pulling knife
(6) - Roller
Proper setting
The control cam (3) makes direct contact with the clamping ring (2).
The distance between the widest extent of the control cam (3) and the
roller (6) is no greater than 0.1 mm.
In the rest position, the thread-pulling knife (5) is flush with the cutting
edge of the counter blade (4).
The thread-pulling knife (5) must move smoothly, but must not have any
axial play.
To set the cutoff curve:
1. Tilt the machine head ( p. 16).
2. Loosen the threaded pins on the clamping ring (2).
3. Push the clamping ring (2) as far as it will go to the left.
4. Tighten the threaded pins on the clamping ring (2).
Important
Tighten the threaded pins on the clamping ring (2) before you loosen the
threaded pins on the control cam (3). The clamping ring (2) and control
cam (3) are both mutually used as a stop and must not be loosened at the
same time.
5. Loosen the threaded pins on the control cam (3).
6. Press the lever (1) against the solenoid.
7. Set the distance between the roller (7) and control cam (3) at the highest
point of the control cam (3) to 0.1 mm.
8. Tighten the threaded pins on the control cam (3).
9. Loosen the clamping screw on the lever (1).
72 Service Instructions 670/680 - 00.0 - 07/2017
Thread cutter
②
③
①
①
10. Turn the thread-pulling knife (5) so that the tip is flush with the cutting
edge of the counter blade (4).
11. Tighten the clamping screw on the lever (1).
In doing so, ensure that there is no axial play.
12. Loosen the threaded pins on the clamping ring (2).
13. Push the clamping ring (2) as far as possible to the right against the
control cam (3).
14. Check the loop stroke ( p. 49).
15. Tighten the threaded pins on the clamping ring (2).
15.3 Setting the swivel range of the thread-pulling knife
Abb. 59: Setting the swivel range of the thread-pulling knife
(1) - Screw
(2) - Screw
Proper setting
The thread-pulling knife can move from its park position to the maximum
swivel angle without colliding with the hook cover.
The swivel range of the thread-pulling knife is at its smallest when the
eccentric bolt (3) is rotated by 180°.
To set the swivel range of the thread-pulling knife:
1. Loosen screws (1) and (2).
2. Turn the eccentric bolt (3).
3. Tighten screws (1) and (2).
4. Check the swivel range and readjust it if necessary.
Important
5. Reset the park position of the thread-pulling knife ( p. 72).
(3) - Eccentric bolt
Service Instructions 670/680 - 00.0 - 07/2017 73
15.4 Setting the cutting pressure
③
④
①
⑥
⑦
⑧
⑨
⑩
②
⑤
NOTICE
Property damage may occur!
Increased knife wear or breakage is possible.
Do not set the pressure of the counter blade too high.
Abb. 60: Setting the cutting pressure
Thread cutter
(1) - Thread-pulling knife
(2) - Screw
74 Service Instructions 670/680 - 00.0 - 07/2017
(3) - Lever
(4) - Control cam
(5) - Screw
The shape of the thread-pulling knife automatically creates the required
cutting pressure as soon as the thread-pulling knife and counter blade
make contact.
Proper setting
In the rest position, the hook thread clamp (10) makes contact with the
thread-pulling knife (1) without any pressure being applied.
Any 2 threads with the greatest strength used for sewing can be neatly cut
simultaneously.
(6) - Counter blade support
(7) - Screw
(8) - Eccentric
(9) - Counter blade
(10) - Hook thread clamp
Thread cutter
①
②
③
To set the cutting pressure:
1. Turn the handwheel until the thread-pulling knife (1) can be swung out
by hand.
2. Swivel the thread-pulling knife (1) so far that the distance between the
2 cutting edges is approx. 2 mm.
3. Loosen the screw (7).
4. Turn the counter blade support (6) by screwing the screw (5) against
the thread-pulling knife (1).
5. Loosen the screw (2).
6. Adjust the eccentric (8) so that the cutting edge of the counter blade
(9) is parallel to the cutting edge of the thread-pulling knife (1).
The counter blade (9) must abut on the thread-pulling knife (1).
7. Tighten the screw (2).
8. Tighten the screw (7).
9. Check the cutting pressure and readjust it if necessary.
15.5 Setting the hook thread clamp
Abb. 61: Setting the hook thread clamp
(1) - Thread-pulling knife
(2) - Hook thread clamp
To set the hook thread clamp:
1. Turn the handwheel until the thread-pulling knife (1) can be swung out
by hand.
2. Swivel the thread-pulling knife (1) so far that the distance between the
2 cutting edges is approx. 2 mm.
3. Loosen the screw (3).
4. Move the hook thread clamp (2) so that it abuts on the thread-pulling
knife (1).
5. Tighten the screw (3).
(3) - Screw
6. Check the clamping effect and readjust it if necessary.
Service Instructions 670/680 - 00.0 - 07/2017 75
15.6 Setting point in time for cutting
④
①⑤
②③
Abb. 62: Setting point in time for cutting
Thread cutter
(1) - Roller
(2) - Clamping ring
(3) - Control cam
Proper setting
The threads are cut when the thread lever is at the top dead center
(handwheel at position 60°).
To set the point in time for cutting:
1. Loosen the threaded pins on the control cam (3).
2. Swivel the thread-pulling knife (1) until the cutting edge of the threadpulling knife (1) lines up with the cutting edge of the counter blade (2).
3. Move the handwheel into the 60° position.
4. Push the control cam (3) to the left as far as it will go and against the
clamping ring (2).
5. Turn the control cam (3) until it is in contact with the roller (1).
6. Tighten the threaded pins on the control cam (3).
7. Check setting:
• Insert the thread into the thread-pulling knife (1) and slowly turn the
handwheel.
• Check the handwheel position at which the thread is cut.
(4) - Counter blade
(5) - Thread-pulling knife
• Readjust the setting if necessary.
76 Service Instructions 670/680 - 00.0 - 07/2017
Setting the potentiometer
③
④
⑤
①
②
16 Setting the potentiometer
The potentiometer adjusts the number of stitches to the set sewing foot
stroke and reduces the number of stitches if the sewing foot stroke is too
much.
Proper setting
The lifting gear is at 0.
If, at Technician level, the parameter t1004 is called and the OK button
is pressed, the display shows 1 in first place on the left and the corresponding maximum speed next to it.
Abb. 63: Setting the potentiometer (1)
(1) - ESC button
(2) - P button
(3) - Plus/Minus buttons
To set the potentiometer:
1. Remove the arm cover ( p. 17).
2. Switch off the machine.
3. Keep the buttons P (2) and Reset (4) pressed down simultaneously
and switch on the machine when doing so.
The display starts.
4. Release the buttons P (2) and Reset (4).
The display indicates the current level.
The potentiometer is set at technician level t1004.
If the display indicates a different level:
5. Calling the technician level using the Plus/Minus buttons (3):
As the case may be, press the Plus or Minus button below the letter
or the number until the display indicates t1004.
6. Press the OK button.
(4) - Reset button
(5) - OK button
Service Instructions 670/680 - 00.0 - 07/2017 77
Abb. 64: Setting the potentiometer (2)
⑨
⑥⑦
⑧
⑩⑪
Setting the potentiometer
(6) - Plates
(7) - Threaded pins
7. Check whether the plates (6) of the lifting gear are flush.
8. If the plates (6) are not flush:
• loosen the threaded pins (7), and the block (9) will be pulled
downward by spring force.
• Set the threaded pin (8) through the hole on the rear so that the pla-
tes (6) are flush.
• Tighten the threaded pins (7).
The lifting gear is at 0.
Abb. 65: Setting the potentiometer (3)
(8) - Threaded pin
(9) - Block
(10) - Threaded pin (11) - Potentiometer
9. Loosen the threaded pin (10).
10. Turn the potentiometer axle such that the left display shows 4 in the
11. Tighten the threaded pin (10) without the value in the display changing.
12. Press the ESC button twice.
Important
13. Switch off the machine.
14. Switch on the machine.
Switching off and on will save the setting.
78 Service Instructions 670/680 - 00.0 - 07/2017
first instance and the relevant maximum speed next to it.
Edge cutter (only 680)
⑤
④
①
②
③
⑥
17 Edge cutter (only 680)
The edge cutter can be electropneumatically switched via 2 switching
cylinders.
Abb. 66: Edge cutter
(1) - Eccentric
(2) - Lever
(3) - Movable bolt
Edge cutter function
When the edge cutter is activated, the eccentric (1) completes a stroke
movement through the arm shaft movement. The stroke movement is transmitted to the lever (2).
The movable bolt (3) is engaged in the hole of the lever (2) and is connected
to the lever (6). The movement of the lever (6) is transmitted to the pull rod
(5). The movement of the pull rod (5) moves the lever (4) up and down and
generates the cutter movement.
(4) - Lever
(5) - Pull rod
(6) - Lever
When the edge cutter is deactivated, the clevis pulls out the bolt (3) and
the lever (6) is moved into a different position. The torsion spring pulls the
pull rod downwards and the cutter upwards via the lever (4).
Service Instructions 670/680 - 00.0 - 07/2017 79
17.1 Assembling and setting the blade
①
②
①
②
①
③
17.1.1 Assembling the counter blade
Abb. 67: Assembling the counter blade
Edge cutter (only 680)
(1) - Screws (2) - Counter blade
To assemble the counter blade:
1. Clamp the counter blade (2) next to the throat plate.
The blade slant must point to the throat plate.
2. Fix the counter blade (2) in place using screws (1).
17.1.2 Assembling and setting the movable blade
Abb. 68: Assembling and setting the movable blade (1)
(1) - Screw
(2) - Threaded pin
(3) - Movable blade
80 Service Instructions 670/680 - 00.0 - 07/2017
Edge cutter (only 680)
③
⑤
④
⑦
⑧
⑥
To assemble and set the movable blade:
1. Loosen the screw (1).
2. Turn back the threaded pin (2).
3. Disassemble the movable blade (3).
Abb. 69: Assembling and setting the movable blade (2)
(3) - Movable blade
(4) - Screw
(5) - Screw
4. Press the button.
The knife carrier (7) moves down.
5. Loosen the screw (4).
6. Turn the screw (5) to move the knife carrier (7) to the side.
7. Loosen the threaded pin (8).
8. Press the button.
The knife carrier (7) moves up.
9. Insert a new movable blade (3).
The movable blade (3) is flush on top with the knife carrier (7).
10. Press the knife carrier (7) down manually.
11. Turn the screw (5) so that the movable blade (3) abuts on the counter
blade with as little pressure as possible.
The movable blade (3) fits exactly into the throat plate cutout.
12. Tighten the screw (4).
(6) - Screw
(7) - Knife carrier
(8) - Threaded pin
Service Instructions 670/680 - 00.0 - 07/2017 81
Edge cutter (only 680)
0.5 - 1 mm
①
②
③④ ④
17.1.3 Setting the cutting pressure and blade position
Abb. 70: Assembling and setting the blade (3)
(1) - Screws
(2) - Threaded pin
To set the cutting pressure:
1. Loosen the counternut (3).
2. Screw in or loosen the threaded pin (2) to set the cutting pressure.
• More cutting pressure: screw in the threaded pin (2).
• Less cutting pressure: loosen the threaded pin (2).
3. Tighten the counternut (3).
The threaded pin is also used for the stability of the movable
blade (3) and ensures a stable cutting pressure.
To set the blade position:
1. Loosen the screws (1).
2. Set the movable blade (4).
When the movable blade (4) is at the bottom dead center, there is a
gap of 0.5-1 mm between the front edge of the blade and the throat
plate.
3. Tighten the screws (1).
(3) - Counternut
(4) - Movable blade
82 Service Instructions 670/680 - 00.0 - 07/2017
Edge cutter (only 680)
①②
17.2 Setting the timing of the blade stroke movement
Abb. 71: Setting the timing of the blade stroke movement
(1) - Eccentric (2) - 1st screw in rotational direction
To set the timing of the blade stroke movement:
1. Remove the rear cover ( p. 19).
2. Move the handwheel into the 350° position.
The 1st screw in rotational direction (2) on the eccentric (1) is up.
3. If the 1st screw in rotational direction (2) is not up, loosen both screws
on the eccentric (1) and set the eccentric (1) correctly.
OR
1. Remove the rear cover ( p. 19).
2. Turn the handwheel until the needle is at the top dead center and the
blade is at the bottom dead center.
The 1st screw in rotational direction (2) on the eccentric (1) is up.
Service Instructions 670/680 - 00.0 - 07/2017 83
Edge cutter (only 680)
②
③
④
①
②
3. If the 1st screw in rotational direction (2) is not up:
• Loosen both screws on the eccentric (1).
• Turn the handwheel until the needle is at the top dead center and
the blade is at the bottom dead center.
• Re-tighten both screws.
17.3 Setting the stroke height of the blade
Abb. 72: Setting the stroke height of the blade
(1) - Threaded pin
(2) - Bolt
To set the stroke height of the blade:
1. Remove the rear cover ( p. 19).
2. Loosen the threaded pin (1).
3. Pull the bolt (2) out.
4. Insert the bolt (2) together with the transmission rod into the hole (4).
• Outside hole: stroke height of the blade 10 mm
• Inside hole: stroke height of the blade 20 mm
5. Tighten the threaded pin (3) in the hole (4).
(3) - Threaded pin
(4) - Hole
84 Service Instructions 670/680 - 00.0 - 07/2017
Stitch loosening unit
①
②
③
④
⑤
⑥
18 Stitch loosening unit
Abb. 73: Stitch loosening unit
(1) - Control cam
(2) - Sensor lever
(3) - Vertical shaft
Stitch loosening unit function
When the stitch loosening unit is activated, the probe (5) is on the
control cam (1).
The movement is transmitted via the sensor lever (2) and the vertical
shaft (3) on the lever (4).
The lever (4) moves the stitch loosening unit.
When the stitch loosening unit is deactivated, the pneumatic cylinder (6)
is extended. The probe (5) lifts off from the control cam (1) and no
movement is transmitted.
(4) - Lever
(5) - Probe
(6) - Pneumatic cylinder
Service Instructions 670/680 - 00.0 - 07/2017 85
Stitch loosening unit
①
18.1 Setting the swivel movement timing
NOTICE
Property damage may occur!
Risk of breakage if setting is incorrect.
Set the swivel movement to use it when the needle is at the top dead
center.
Abb. 74: Setting the swivel movement timing (1)
(1) - The 1st screw in rotational direction
To set the swivel movement timing:
1. Remove the rear cover ( p. 19).
2. Move the handwheel into the 180° position.
The needle is at the bottom dead center.
The 1st screw in rotational direction (1) on the control cam is up.
OR
86 Service Instructions 670/680 - 00.0 - 07/2017
Stitch loosening unit
④
③
②
Abb. 75: Setting the swivel movement timing (2)
(2) - Throat plate
(3) - Notch
1. Turn handwheel until the needle is at the top dead center.
The stitch loosening finger (4) is positioned over the center of the
needle hole (2).
The stitch loosening finger (4) is exactly in line with the notch (3) in
the sewing foot.
(4) - Stitch loosening finger
Service Instructions 670/680 - 00.0 - 07/2017 87
Stitch loosening unit
①
②
18.2 Setting the position of the swivel movement
Proper setting
The stitch loosening finger swivels in the center of the feeding foot. In the
left and right end position, the stitch loosening finger is at a distance of
approx. 0.3 mm to the feeding foot.
Abb. 76: Setting the position of the swivel movement
(1) - Screw (2) - Vertical shaft
To set the position of the swivel movement:
1. Remove the rear cover ( p. 19).
2. Loosen the screw (1).
3. Turn the vertical shaft (2) slightly.
4. Tighten the screw (1).
5. Test the swivel movement and readjust it if necessary.
88 Service Instructions 670/680 - 00.0 - 07/2017
Stitch loosening unit
①
18.3 Setting the height of the stitch loosening finger
Abb. 77: Setting the height of the stitch loosening finger
(1) - Nut and threaded pin
The height of the stitch loosening finger determines the looseness of
the seam.
To set the height of the stitch loosening finger:
1. Loosen the nut and threaded pin (1).
2. Move the threaded pin (1) into the long hole.
• Greater looseness of the seam: push the threaded pin (1) upwards
• Less looseness of the seam: Push the threaded pin (1) downwards
3. Tighten the nut and threaded pin (1).
Service Instructions 670/680 - 00.0 - 07/2017 89
Stitch loosening unit
①
②
③
18.4 Setting the height stop for the stitch loosening unit
The stitch loosening unit and the gear unit must not rest on the sewing
material during sewing to ensure a correct feed.
The height stop prevents the stitch loosening unit from lowering onto the
sewing material under its own weight.
Abb. 78: Setting the height stop for the stitch loosening unit
(1) - Threaded pin for height stop
(2) - Scanner for sewing material thickness
To set the height stop for the stitch loosening unit:
1. Screw in or unscrew the threaded pin (1).
• To set the scanner (2) and stitch loosening finger (3) lower:
Unscrew the threaded pin (1)
• To set the scanner (2) and stitch loosening finger higher:
Screw in the threaded pin (1)
(3) - Stitch loosening finger
90 Service Instructions 670/680 - 00.0 - 07/2017
Stitch loosening unit
①
18.5 Setting the drive ratio of the stitch loosening finger when
raising the sewing foot:
Abb. 79: Setting the drive ratio of the stitch loosening finger when raising the sewing foot:
(1) - Screw
To set the drive ratio of the stitch loosening finger when raising the sewing
foot:
1. Loosen the screw (1).
2. Move the screw (1) into the long hole.
• More stroke: move the screw (1) downwards
• Less stroke: move the screw (1) upwards
3. Tighten the screw (1).
4. Check the drive ratio and readjust it if necessary.
Service Instructions 670/680 - 00.0 - 07/2017 91
Setting the automatic material thickness detection
①
②
19 Setting the automatic material thickness detection
The sensor for automatic material thickness detection is located in the
machine head. The sensor must be set so that the automatic stitch
loosening can be set correctly using the OP1000 control panel ( p. 99).
Proper setting
Abb. 80: Setting the automatic material thickness detection (1)
(1) - Sensor (2) - Magnetic strips
The sensor (1) is located at a distance of 0.5 mm exactly above the
magnetic strip (2).
To set the automatic material thickness detection:
1. Remove the head cover ( p. 17).
92 Service Instructions 670/680 - 00.0 - 07/2017
Setting the automatic material thickness detection
⑥
③
④
⑤
0.5 mm
②
①
Abb. 81: Setting the automatic material thickness detection (2)
(3) - LED
(4) - LED
2. Loosen the screws (5).
3. Turn the threaded pins (6) to set the distance between the sensor (1)
and the magnetic strips (2).
• Increase the distance: Screw in the threaded pins (6).
• Reduce the distance: Loosen the threaded pins (6).
Abb. 82: Setting the automatic material thickness detection (3)
(5) - Screws
(6) - Threaded pins
(1) - Magnet (2) - Magnetic strips
Service Instructions 670/680 - 00.0 - 07/2017 93
Setting the automatic material thickness detection
4. Tighten the screws (5).
5. Move the sewing foot right up to the top with the hand lever
The LED (4) lights up green.
The LED (3) does not light up.
6. If the LED (3) lights up red, correct the setting.
94 Service Instructions 670/680 - 00.0 - 07/2017
Programming
③④ ⑤
②
⑥
⑦①
②
20 Programming
All software settings are performed using the OP1000 control panel.
The control panel is composed of a display and buttons.
Using the control panel you can:
• Use groups of buttons to select machine functions
• Read service and error messages.
Information
This chapter describes the machine-specific functions of the OP1000
control panel.
Refer to the Instructions for use DAC basic/classic for further informa-
tion on the control and the OP1000 control panel.
Abb. 83: Programming
(1) - Power LED
(2) - Thread button group
(3) - Function button
(4) - Programming button group
(5) - Seam program button group
(6) - LED for 2nd Stitch length
(7) - Display
Service Instructions 670/680 - 00.0 - 07/2017 95
OP1000 buttons and functions
Button Function
Thread button group
Start bartack • Sets the start bartack
Multiple start bartack • Sets the multiple start bartack
End bartack • Sets the end bartack
Multiple end bartack • Sets the multiple end bartack
Thread cutter • Activates or deactivates th e thread
Programming
cutter
Thread clamp • Activates or deactivates the thread
clamp
Needle position after sewing stop • Sets the needle position after sewing
stop
Sewing foot lift after thread cutter • Activates or deactivates the sewing
foot lift after the thread cutter
Sewing foot lift after sewing stop • Activates or deactivates the sewing
foot lift after sewing stops
Soft start • Activates or deactivates the soft start
Speed • Reduces the motor speed
Function button • Activates or deactivates any stored
function
Programming button group
ESC • Ends parameter mode
96 Service Instructions 670/680 - 00.0 - 07/2017
Programming
Button Function
A+ • Increases parameter
• Changes user level
• Selects subprogram
B+ • Increases parameter
• Changes to next higher category
• Selects subprogram
C+ • Increases parameter
• Selects subprogram
D+ • Increases parameter
• Selects subprogram
OK • Calls parameter or saves it
P • Starts or ends the parameter mode
A- • Decreases parameter
• Changes user level
• Selects subprogram
B- • Decreases parameter
• Changes to next lower category
• Selects subprogram
C- • Decreases parameter
• Selects subprogram
Service Instructions 670/680 - 00.0 - 07/2017 97
Button Function
D- • Decreases parameter
Reset • Resets the (piece) counter
Seam program button group
Seam program I • Activates seam program I
Seam program II • Activates seam program II
Programming
• Selects subprogram
Seam program III • Sets seam program III
98 Service Instructions 670/680 - 00.0 - 07/2017
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