Adler 744-122 Service Manual

Contents

Part 3: Service Instructions 744-122

Home

Page

1.	Notes Prior to Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3
2.	Transport Carriage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3
2.1	Right End Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4
2.2	Left End Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
2.3	Marking on the Material Guide Rail and the Material Stopper . . . . . . . . . . . . . . . . .	5
2.4	Transport Carriage Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
2.5	Material Guide Rail Stroke Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7
3.	Material Stopper Mounting and Material Stopper . . . . . . . . . . . . . . . . . . . . . .	9
4.	Distance from the Material Guide Rail to the Needle . . . . . . . . . . . . . . . . . . . .	10
5.	Light Barrier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	11
6.	Synchronizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	12
7.	Adjusting the Machine Head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	13
7.1	Folding Over the Machine Head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	13
7.2	Adjustment Disk to the Arm Shaft Crank . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	14
7.3	Position of the Lower Timing Belt Pulley . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	14
7.4	Rocker Bolt for the Hook Drive and the Left Shaft Bearing . . . . . . . . . . . . . . . . . . .	15
7.5	Hook Drive Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	16
7.6	Needle Avoidance Movement of the Hook (Ellipse Width) . . . . . . . . . . . . . . . . . . .	16
7.7	Symmetry of Looper Motion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	18
7.8	Hook in Hook Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	19
7.9	Setting the Hook to the Needle Center . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	19
7.10	Needle Rod Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	19
7.11	Needle Protector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	20
7.12	Bobbin Disk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	20
7.13	Needle Thread Catcher . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	21
8.	Thread Trimmer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	22
9.	Throw-Over Stacker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	26
9.1	Distance to the sewing unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	26
9.2	Setting the Opening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	26
9.3	Setting the Height of the Counterholder . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	26
9.4	Setting the Position of the Placement Plate . . . . . . . . . . . . . . . . . . . . . . . . . . .	26
9.5	Setting the Speed of the Smoother Movement . . . . . . . . . . . . . . . . . . . . . . . . .	27

Part 3: Service Instructions

1. Notes prior to adjustment

Transport carriage

These servicing instructions describe the adjustments to the sewing unit in the appropriate order.

Here it is to be noted that the various adjustment positions are interdependent. It is therefore essential that the adjustments be made in the order described.

Attention Danger of Breakage!

After disassembly and prior to restarting the sewing unit, the required adjustments must be made as described in these instructions. The sewing unit must not be started with the wrong direction of motor rotation.

Attention Risk of Injury!

Should adjustments have to be made in the area of the needle and the needle not be absolutely necessary to these, it should be removed to avoid injuries.

The main switch should always be turned off. The only exceptions are those adjustments which must be made with testing, setting or sewing programs from the control unit.

Attention!

With some adjustments it is necessary to move the transport carriage manually.

This is possible with the main switch OFF.

When the main switch is ON, e.g. when the testing program is to be used, the step motor is under current and its braking effect stops manual movement. In this case the fuse 3 for the step motor must be removed from the control panel. For all adjustments to parts forming stitches a faultless needle must be used.

Upon request you will receive the following adjustment gauges:

Order no. Application

933 80207 Dail gauge

933 80193 Angle for the looper symmetry setting

933 80194 Indicator for the looper symmetry setting

933 80200 Feeler gauge for the thread take-up disk

933 80203 Gauge for the hook drive housing

933 80221 Gauge for the rocker bolt in the hook drive

An adjustment disk in the machine head has the notches A,B,C and D. An arresting pin, order no. 211700, for locking into the various adjustment positions can be found in the package with the unit. In conjunction with the letters on the handwheel the arresting pin can be pushed into one of the notches through a hole.

Caution in the area of moving machine parts - Risk of Injury -

The transport carriage is guided on the extension pipes at the front by the ball sleeves 2 and at the back by the track rollers 1.

They have been set tight at the factory. To remove axial play only loosen the excentrically bearinged lower rollers 1 and set tight. Check for ease of movement.

The transport carriage is advanced by the step motor for the following speeds: Stitch condensing, Normal stitch length and transport carriage return. Through a coding on the material stopper it is possible by primary seams to reduce return speed for a partial or complete run according to the rail form. See 5.1.10 of the Microcontrol summary.


1		2

2.1_ Right End Position

If the right position has been set with the L<-W->R key, right diode bright, then the carriage will stop at the right.

The distance between the middle of the cylinder 4 and the middle of the needle should be 212.5_mm in the right end position.

Main switch off

- Risk of Injury -

Preliminary Adjustments

–The b417.6 selector switch on the back of the control unit front panel must be set closed for 1000 mm and open for 1250 mm, appropriate to the rail length used.

–With the main switch Off, set the transport carriage with the bracket 6 over the switch b7. There must be a gap of 0.5 mm between the bracket 6 and the switch b7.

Also between timing belt clamp 9 and switch b8.

–With lit right diode and a long tap of the L<-W->R key, set the parameter value to 0 with the numeric keypad.

–A gap of 105 mm must be set between the cast guide 8 under the machine arm and the clamp piece 5.

–In order to avoid a collsion of the transport carriage with the machine head during a malfunction of the step motor, the safety stopper 7 is to be set at a distance of 25 mm from the machine head at the right.

The distance of the safety stopper 11 at the left behind the machine head should be 45 mm at 1000 mm sewing length and 58 mm at 1250 mm sewing length.

–Switch b8 serves as a safety switch. Its distance from the mounting plate 10 should be 53 mm by 1000 mm sewing length and 55 mm by 1250 mm sewing length.

All setting measurements can be seen together in the following dimension sketch.

For the fine adjustment of the right end position see the next page.

b8 10

212,5 mm

5 b7 6

105 mm

25mm

8 7

Fine Adjustment

–Switch on main switch.

–With the right diode lit and a longer tap of the L<-W->R key, set the parameter to 0 with the numeric keypad.

–Conduct a reference run by pressing the <-O-> key. The carriage travels to the left.

When reaching the switch b7 this is run past by a bit. The step motor switches over and at first runs at low speed to the reference point (b7) and then runs with return speed to thr right end position.

The distance between the middle of the cylinder 4 and the middle of the needle should then be 212.5 mm. The right end position is to be precisely set by adjusting the bracket_6 and repeated reference runs.

Note!

This is the initial carriage position which must be exactly adhered to in order to be able to alternate work with different material guide rails.

2.2 Left end position

Set the left position with the L<-W->R key. The left diode lights up.

Conduct a refernce run with the <-O-> key. The carriage stops in the left end position. This position corresponds to the position of the switch b7 as described in Section 2.1. It must not be altered.

In order to avoid a collision of the carriage by a possible malfunction, the stopper 7 is to be set at a distance of 25 mm from the cast part 8. See illustration in Sec. 2.1 and the dimension sketch.

2.3Marking on the material guide rail and the material stopper

The marking 3 on the rail and the marking 2 on the material stopper must lie exactly opposite each other. They show the extreme sewing length range 1000 or 1250 mm, that is, the seam end.

The curved rail contour must correspond to that of the material stopper.

After loosening the screws 1 located at the left and right the rail can be aligned in its slots to the contour of the material stopper.

The carriage end position set at switch b7 may not be changed for this purpose.

1	2	3

Mounting plate

Step motor

bracket for the left end position 212.5 mm

	Last
	guide
	under
Stopper for the right carriage end position	the head	Stopper for the left carriage end position

Cylinder for the rail

Needle

Table-top

* Measure by long transport carriage (Sewing length 1250 mm)

2.4 Transport Carriage Guide

Turn main switch off - Risk of Injury -

With curved material guide rails the guide rod 2 is moved within an allowable range crosswise to the direction of sewing.

The range is properly set if there is a distance of 135 mm between the transport carriage 3 and the clamping piston 4 when the guide rod 2 is pulled to its rest at the front of the unit.

For a perfect laying-on of the rail the guide rod must be set tight and parallel to the table top.

–Loosen the clamping piece 8 and set the dimension 135 mm.

–When tightening the clamping piece 8 take care that the stroke cylinder 1 is vertically aligned.

–Measure the distance to the material slider bed with the guide rod 2 in its forward and rear positions.

–Should the distances not be equal, first loosen the guide beads 6.

–Achieve parallelism of the guide rod 2 by adjusting the excentrically bearinged guide rollers 5.

This is to be performed appropriate to the measurement results so that first one of the rollers is loosened and turned slightly.

The transport carriage is to be held tight by the second roller.

–Set the guide rails 6 tight on roller 7.

Take care that the guide rod can still be easily moved.

The left guide rod is to be adjusted in the same manner.

135 mm

2.5Stroke cylinder for the material guide rail

Turn main switch off - Risk of Injury -

A perfect laying-on of the material guide rail is dependent on the setting of the stroke cylinder 1.

As described in 2.4, the stroke cylinder 1 must be set vertically.

The lowering stroke should be so dimensioned that the material guide rail just barely securely lays on to the material slider bed.

A stroke cylinder 1 set too low worsens the laying on of the material guide rail.

The material guide rail, which is pretensioned along its whole length, could lift in the middle.

–Loosen screw 9.

–Set the height of the stroke cylinder 1 appropriately.

–Tighten screw 9.

11 10 1 2

88 mm

3._ Material stopper mounting and material stopper

Turn main switch off - Risk of Injury -

The material stopper mounting 2 must be in a specific initial position in order to be able to interchange material stoppers for various seam configurations without having to make further adjustments.

At the stopper bolt 5 lying on the stopper there must be a distance of 88_mm between the front of the guide pipe_10 and the front edge_1 of the material stopper mounting 2.

–Loosen nut 4.

–Move the stopper bolt 5 so that there is a gap of 88 mm between the front edge_1 and the angle_11.

–Tighten nut 4.

The equidistant interval from the seam to the material edge (seam interval) is determined by the material stopper 6.

Prerequisite for the setting is that the adjustments for the right transport carriage end position as per Section 2.1 and the markings on the rail and material stopper as per Section 2.3 have been carried out correctly.

–Loosen screw 3.

–Align the material stopper 6 so that there is an equidistant seam interval between it and the material guide rail along their complete length, e.g. 10 mm.

–Tighten screw 3.

The sewing unit can only be started when the material stoppers have reached their end position, this is, when the switch b3 for the left stopper and the switch b4 for the right stopper have been activated.

–Turn main switch on.

–Key in Program 63 on the "PROGRAM" switch and activate with the STOP key. Enter the number 4 for switch b4.

–Push the stopper all the way to the back until at rest. - B4+ must appear in the display.

–Should this not be the case then a gap of 0.5 mm must be set between the contact maker 7 and the switch b4. Set contact maker so far over the switch until B4+ appears.

–Set switch b3 in the same manner.

–The forward and back movements of the material stoppers should be continuous, not jerky.

They can be adjusted at the throttle valves 8 and 9.

The right material stopper has an advance function, this means that when the transport carriage has passed the right material stopper this then starts its movement to the front to again position the material.

The timing is fixed in the controls.

+ 18 hidden pages