574
571
574
ADJUSTMENT MANUAL
591
This Adjustment Manual is valid for machines
from the following serial numbers onwards:
# 6 500 120
296-12-19 196/002
Justieranleitung engl. 07.12
The reprinting, copying or translation of PFAFF Service Manuals, whether in whole or in part,
is only permitted with our previous authorization and with written reference to the source.
PFAFF Industriesysteme
und Maschinen AG
Hans-Geiger-Str. 12 - IG Nord
D-67661 Kaiserslautern
Index
Contents ................................................................................ Page
1 Adjustment ........................................................................................................................... 5
1.01 Tools, gauges and other accessories .................................................................................... 5
1.02 Abbreviations ......................................................................................................................... 6
1.03 Explanation of the symbols .................................................................................................... 6
1.04 Adjusting the basic machine .................................................................................................. 7
1.04.01 Needle position in sewing direction (on the PFAFF 571 and 591) ......................................... 7
1.04.02 Needle position in sewing direction (on the PFAFF 574) ........................................................ 8
1.04.03 Preliminary adjustment of the needle height ......................................................................... 9
1.04.04 Needle rise, hook clearance, needle height and needle guard (on the PFAFF 571) .................10
1.04.05 Needle rise, hook clearance, needle height and needle guard (on the PFAFF 574) .................12
1.04.06 Needle rise, hook clearance, needle height and needle guard (on the PFAFF 591) .................14
1.04.07 Needle position crosswise to sewing direction (on the PFAFF 571) .................................... 16
1.04.08 Needle position crosswise to sewing direction (on the PFAFF 574) .................................... 17
1.04.09 Needle position crosswise to sewing direction (on the PFAFF 591) .................................... 18
1.04.10 Height and stroke of the bobbin case opener ...................................................................... 19
1.04.11 Height of the feed wheel (on the PFAFF 571) ...................................................................... 20
1.04.12 Height of the feed wheel (on the PFAFF 574) ...................................................................... 21
1.04.13 Height of the feed wheel (on the PFAFF 591) ...................................................................... 22
1.04.14 Stitch length control eccentric ............................................................................................. 23
1.04.15 Stitch length scale disk ........................................................................................................ 24
1.04.16 Shaft crank to feed wheel drive ........................................................................................... 25
1.04.17 Shaft crank to roller presser drive ........................................................................................ 26
1.04.18 Clearance between roller presser and feed wheel .............................................................. 27
1.04.19 Roller presser ....................................................................................................................... 28
1.04.20 Stitch length on stitch length scale ...................................................................................... 29
1.04.21 Synchronization of roller presser and feed wheel ................................................................ 30
1.04.22 Retainer (only on model 574) ............................................................................................... 31
1.04.23 Knee lever ............................................................................................................................ 32
1.04.24 Needle thread tension release ............................................................................................. 33
1.04.25 Thread check spring (PFAFF 571 and 591) ........................................................................... 34
1.04.26 Thread check springs (PFAFF 574)........................................................................................ 35
1.04.27 Bobbin winder ...................................................................................................................... 36
1.04.28 Pressure of roller presser .....................................................................................................37
1.04.29 Lubrication ...........................................................................................................................38
1.04.30 Re-engage safety coupling ...................................................................................................39
1.05 Adjusting the edge trimmer -725/04 .................................................................................... 40
1.05.01 Position of the knife holder (on model 571) ......................................................................... 40
1.05.02 Position of the knife holder (on models 574 and 591) .......................................................... 41
1.05.03 Knife stroke (on model 571) ................................................................................................. 42
3
Index
Contents ................................................................................Page
1.05.04 Knife stroke (on models 574 and 591) .................................................................................. 43
1.05.05 Cutting stroke (on model 571).............................................................................................. 44
1.05.06 Cutting stroke (on models 574 and 591) .............................................................................. 45
1.05.07 Knife position ....................................................................................................................... 46
1.06 Adjusting the thread trimmer -900/83 .................................................................................. 47
1.06.01 Resting position of the roller lever / radial position of the control cam ................................ 47
1.06.02 Position of the thread catcher holder ...................................................................................48
1.06.03 Position of the thread catcher .............................................................................................. 49
1.06.04 Knife position and knife pressure ......................................................................................... 50
1.06.05 Bobbin thread retaining spring ............................................................................................. 51
1.06.06 Manual cutting test .............................................................................................................. 52
1.06.07 Releasing the tension .......................................................................................................... 53
1.06.08 Linkage rod (only for the PFAFF 574) ...................................................................................54
1.07 Adjustment of backtacking mechanism -911/.. ..................................................................... 55
1.07.01 Needle in needle hole (only for PFAFF 571 and 591) ........................................................... 55
1.07.02 Coupling for roller presser drive ........................................................................................... 56
1.07.03 Bevel gears for feed wheel drive ......................................................................................... 57
1.07.04 Bevel gear play ..................................................................................................................... 58
1.07.05 Adjusting the magnets ......................................................................................................... 59
1.08 Parameter settings ...............................................................................................................60
2 Block diagram ..................................................................................................................... 61
4
Adjustment
1 Adjustment
Please observe all notes from Chapter 1 Safety of the instruction manual!
In particular care must be taken to see that all protective devices are refi tted
properly after adjustment, see Chapter 1.06 Danger warnings of the instruc-
tion manual!
If not otherwise stated, the machine must be disconnected from the electrical
power supply. Danger of injury due to unintentional starting of the machine!
Notes on adjustment
All following adjustments are based on a fully assembled machine and may only be carried
out by expert staff trained for this purpose.
Machine covers, which have to be removed and replaced to carry out checks and adjust-
ments, are not mentioned in the text.
The order of the following chapters corresponds to the most logical work sequence for
machines which have to be completely adjusted. If only specifi c individual work steps are
carried out, both the preceding and following chapters must be observed.
Screws, nuts indicated in brackets ( ) are fastenings for machine parts, which must be
loosened before adjustment and tightened again afterwards.
1.01 Tools, gauges and other accessories
● 1 set of screwdrivers with blade widths from 2 to 10 mm
● 1 set of open-ended wrenches with opening sizes from 7 to 13 mm
● 1 set of allen keys from 1.5 to 6 mm
● 1 clamp (Order No. 08-880 137-00)
● 1 metal rule (Order No. 08-880 218-00)
● 1 gauge (Order No. 08-880 136-01)
● Sewing thread and test material
5
Adjustment
1.02 Abbreviations
1.03 Explanation of the symbols
TDC = top dead center
BDC = bottom dead center
In this adjustment manual, symbols emphasize operations to be carried out or important in-
formation. The symbols used have the following meaning:
Note, information
Service, repair, adjustment, maintenance
(work to be carried out by qualifi ed staff only)
6
Adjustment
1.04 Adjusting the basic machine
1
.04.01 Needle position in sewing direction (on the PFAFF 571 and 591)
Requirement
With the stitch length set at its minimum, the needle should be positioned in the centre
of the needle hole, as seen in the direction of sewing.
1
Fig. 1 - 01
● Set the minimum stitch length.
● Adjust needle bar (screw 1) according to the requirement.
7
Adjustment
61-078
1.04.02 Needle position in sewing direction (on the PFAFF 574)
Requirement
The needle should be positioned in the centre of the needle hole as seen in the direction
of sewing.
2
61-077
1
Fig. 1 - 02
● Adjust needle bar (screws 1 and 2) according to the requirement.
8
Adjustment
1.04.03 Preliminary adjustment of the needle height
Requirement
When the needle bar is at TDC, there must be a clearance of approx. 21 mm between the
needle point and the needle plate.
2
1
21 mm
90-036
Fig. 1 - 03
● Adjust needle bar 1 (screw 2), without turning it, according to the requirement.
9
Adjustment
1.04.04 Needle rise, hook clearance, needle height and needle guard (on the PFAFF 571)
Requirement
With the needle bar positioned 2,4 mm after BDC and the stitch length set at "0.8"
1. the hook point must be at needle centre with a hook-to-needle clearance of
0.05 to 0.1 mm;
2. the top of the needle eye must be 0.8 to 1.0 mm below the hook point;
3. the needle guard 6 must touch the needle lightly.
6
9
2 3
7
8
1
6
4
129-002
10
5
Fig. 1 - 04
● Set stitch length at "0.8".
● Loosen both screws 1, 2, 3, 4 and 5.
● Bring needle bar to 2.4 mm past BDC:
5
61-023
0,8 - 1 mm
Adjustment
● Set hook point at needle centre, making sure that the needle is not defl ected by needle
guard 6.
● Adjust needle height according to Requirement 2.
● Adjust hook post according to Requirement 1 and tighten screws 4 and 5.
● Making sure that there is some play in the bevel gear, tighten screws 1.
● With retaining collar 7 touching bevel gear 8 tighten screws 2 and 3.
● Adjust needle guard 6 (screw 9) according to requirement 3.
When the hook is changed, make sure that
the markings 10 and 11 are both on one side.
10
11
11
Adjustment
1.04.05 Needle rise, hook clearance, needle height and needle guard (on the PFAFF 574)
Requirement
With the needle bar positioned 2,4 mm after BDC
1. the hook point must be at needle centre with a hook-to-needle clearance of
0.05 to 0.1 mm;
2. the top of the needle eye must be 0.8 to 1.0 mm below the hook point;
3. the needle guard 9 must touch the needle lightly.
0,8 - 1 mm
9
7
7
129-002
7
8
7
9
129-001
8
14
8
1
2
4
5
6
3
10 11
12
13
61-025
12
Fig. 1 - 05
● Loosen screws 1, 2, 3, 4, 5, 6 and 7.
● Loosen screws 8 slightly.
● Bring needle bar to 2.4 mm past BDC:
Adjustment
● Set both hook points at needle centre, making sure that the needles are not defl ected by
needle guard 9.
● Adjust needle height according to Requirement 2.
● Adjust both hook posts according to Requirement 1 and tighten screws 8.
● Tighten screws 1 and 6.
● Making sure that there is some play in the bevel gear, tighten screws 3 and 5.
● With retaining collar 10 touching bevel gear 11 tighten screws 2.
● With retaining collar 12 touching bevel gear 13 tighten screws 4.
● Tighten screws 7 on both sides of the post.
● Adjust needle guard 9 (screw 14) on both hooks according to rRquirement 3.
When a hook is changed, make sure that
the markings 15 and 16 are both on one side.
15
16
13
Adjustment
1.04.06 Needle rise, hook clearance, needle height and needle guard (on the PFAFF 591)
Requirement
With the needle bar positioned 2,4 mm after BDC
1. the hook point must be at needle centre with a hook-to-needle clearance of
0.05 to 0.1 mm;
2. the top of the needle eye must be 0.8 to 1.0 mm below the hook point;
3. the needle guard 6 must touch the needle lightly.
9
0,8 - 1 mm
5
6
129-051
5
4
1
2
3
61-028
4
7
14
8
Fig. 1 - 06
● Set stitch length at "0.8".
● Loosen screws 1, 2, 3, 4 and 5.
● Bring needle bar to 2.4 mm past BDC:
Adjustment
● Set hook point at needle centre, making sure that the needle is not defl ected by needle
guard 6.
● Adjust needle height according to Requirement 2.
● Adjust hook post according to Requirement 1 and tighten screws 4.
● Making sure that there is some play in the bevel gear, tighten screws 2.
● With retaining collar 7 touching bevel gear 8 tighten screws 1.
● Screws 5 remain loosened for further adjustments.
● Adjust needle guard 6 (screw 9) according to Requirement 3..
When the hook is changed, make sure
that the markings 10 and 11 are both
on one side.
10
11
15
Adjustment
1.04.07 Needle position crosswise to sewing direction (on the PFAFF 571)
Requirement
When the stitch length is set at its maximum, the needle must be positioned in the cen-
tre of the needle hole when entering and coming out of the needle plate.
2
2
1
2
2
Fig. 1 - 07
● Turn screws 1 (screws 2, on both sides of the post) according to the requirement.
61-029
16
Adjustment
1.04.08 Needle position crosswise to sewing direction (on the PFAFF 574)
Requirement
As seen crosswise to the sewing direction, the needles must penetrate in the centre of
their needle holes.
Fig. 1 - 08
1
2
2
2
2
● Shift bearing plate 1 (screws 2, on both sides of the post) according to the requirement.
17
Adjustment
1.04.09 Needle position crosswise to sewing direction (on the PFAFF 591)
Requirement
As seen crosswise to the sewing direction, the needle must penetrate in the centre of
the needle hole.
4
Fig. 1 - 09
1
4
2
4
90-035
3
2
18
● Adjust feed wheel post 1 (screws 2, 3 and 4) according to the requirement.
Adjustment
1.04.10 Height and stroke of the bobbin case opener
Requirement
1. The top edges of the bobbin case opener 1 and bobbin case base 3 should be on one
level.
2. When the bobbin case opener 1 has defl ected the bobbin case to its furthest point, the
catch of the bobbin case should be 0.3 – 0.5 mm from the back edge of the needle plate
recess.
3
129-006
1
Fig. 1 - 10
1
2
0,3 - 0,5 mm
129-007
● Adjust bobbin case opener 1 (screw 2) in accordance with requirement 1.
● Turn the balance wheel until the bobbin case opener has defl ected the bobbin case to its
furthest point.
● Adjust bobbin case opener 1 (screw 2) in accordance with requirement 2.
On the PFAFF 574 these adjustments must be repeated on the right post.
Depending on the thread size, a variation of the setting in Requirement 2 is
permitted.
19
Adjustment
1.04.11 Height of the feed wheel (on the PFAFF 571)
Requirement
1. When pressure is applied to the feed wheel 4, it should protrude from the needle plate
by tooth height (approx. 0.8 mm)
2. When no pressure is applied to the feed wheel 4 , it should have a vertical play of ap-
prox. 0.3 mm.
4
0,8 mm
Fig. 1 - 11
0,3 mm
1
5
2
1
3
20
● Swing out the roller presser.
● Loosen screws 1 and 2.
● Adjust drive wheel 3 according to requirement 1, taking care to see that the teeth of
drive wheel 3 and feed wheel 4 lock into each other properly.
● Tighten screws 1.
● Adjust guide 5 according to requirement 2 and tighten screws 2.
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