Pfaff 1243-712/02 Guide

ADJUSTMENT MANUAL
296-12-19 316/002
Adjustment manual engl. 11.15
This adjustment manual applies to machines
from the serial number 7 262 540 and
software version 0435/002 onwards.
1243-712/02

Reprinting, copying and translation - including excerpts - from PFAFF adjustment manuals is
permitted only with our prior approval and the listing of sources.
PFAFF Industriesysteme
und Maschinen GmbH
Hans-Geiger-Str. 12 - IG Nord
D-67661 Kaiserslautern

Table of Contents
Contents ..................................................................................Page
13 Adjustment ........................................................................................................................... 5
13.01 Tools, gauges and other accessories .................................................................................... 5
13.02 Abbreviations ......................................................................................................................... 5
13.03 Explanation of symbols.......................................................................................................... 5
13.04 Adjusting basic machine ........................................................................................................ 6
13.04.01 Needle position to needle hole .............................................................................................. 6
13.04.02 Needle height (pre-calibrating) ............................................................................................... 7
13.04.03 Hook-to-needle clearance, needle bar rise, needle height and needle guard ........................ 8
13.04.04 Bobbin case opener ............................................................................................................... 9
13.04.05 Safety clutch ........................................................................................................................ 10
13.04.06 Presser stroke movement.................................................................................................... 11
13.04.07 Presser stroke...................................................................................................................... 12
13.04.08 Needle thread tension release............................................................................................. 13
13.04.09 Thread check spring ............................................................................................................. 14
13.04.10 Bobbin winder...................................................................................................................... 15
13.04.11 Presser foot pressure .......................................................................................................... 16
13.05 Adjusting thread trimmer -900/56 .................................................................................... 17
13.05.01 Control cam ( pre-calibrating ) .............................................................................................. 17
13.05.02 Tripping lever........................................................................................................................ 18
13.05.03 Pawl ..................................................................................................................................... 19
13.05.04 Engaging solenoid................................................................................................................ 20
13.05.05 Release cam ........................................................................................................................ 21
13.05.06 Engaging lever ..................................................................................................................... 22

Table of Contents
Contents ..................................................................................Page
13.05.07 Connecting rod .................................................................................................................... 23
13.05.08 Control cam (pre-calibrating) ................................................................................................ 24
13.05.09 Catch.................................................................................................................................... 25
13.05.10 Thread catcher height .......................................................................................................... 26
13.05.11 Knife..................................................................................................................................... 27
13.05.12 Thread catcher reverse position........................................................................................... 28
13.05.13 Bobbin thread clamp spring ................................................................................................. 29
13.06 Parameter settings .............................................................................................................. 30
13.07 Internet update of control P40 CD ...................................................................................... 30
14 Circuit Diagrams 91-191 585-95 ....................................................................................... 31

Adjustment
5
13 Adjustment
Observe and comply with all instructions in the operating manual's chapter
1 Safety! In particular make sure that all safety covers are installed again
correctly after making adjustments, see chapter 1.06 Operating manual
hazard information!
Unless otherwise stated, the machine must be disconnected from the power
supply before all adjustment work!
Risk of injury due to accidental machine start-up!
Notes on adjustment
All adjustments in this manual are based on a fully assembled machine and may only be
carried out by technical staff trained for this purpose. Machine covers, which have to be
removed and replaced to carry out checks and adjustments, are not mentioned in the text.
The order of the following chapters corresponds to the most logical work sequence for
machines that have to be completely adjusted. Both the preceding and following chapters
must be observed if only specific individual work steps are carried out. Screws and nuts
indicated in brackets () are fastenings for machine parts, which must be loosened before any
adjustment and tightened again afterwards.
13.01 Tools, gauges and other accessories
●1 set of screwdrivers with knife widths from 2 to 10 mm
●1 set of wrenches with jaw widths from 7 to 14 mm
●1 set of Allen keys from 2 to 6 mm
●1 metal ruler (order no. 08-880 218-00)
●Needle rise gauge (order no. 61-111 600-02)
●Screw clamp (order no. 61-111 600-35)
13.02 Abbreviations
t.d.c. = top dead centre
b.d.c. = bottom dead centre
13.03 Explanation of symbols
Activities to be performed or important information in this adjustment manual are
emphasised by symbols. The symbols used have the following meaning:
Note, information
Maintenance, repairs, adjustment, service work
(only to be carried out by technical staff)

Adjustment
6
13.04 Adjusting basic machine
13.04.01 Needle position to needle hole
Rule
The needle should pierce the centre of the needle hole exactly.
●Loosen the screws 1, 2 and 3.
●Move the needle directly over the needle hole by turning the handwheel.
●Move the needle bar frame 4 according to the rule.
●Tighten the screws 1, 2 and 3.
3
Fig. 13 - 01
2
1
4

Adjustment
7
Fig. 13 - 02
13.04.02 Needle height (pre-calibrating)
Rule
When the needle bar is in b.d.c., the clearance between the needle bar and needle plate
should be 23 mm.
●Adjust the needle bar 1 (screw 2) without twisting according to the rule.
1
2
23 mm

Adjustment
8
13.04.03 Hook-to-needle clearance, needle bar rise, needle height and needle guard
Rule
With the needle rise positioned 1.8 mm after b.d.c. of the needle bar:
1. The hook point should be at the needle midpoint and have a clearance of 0.05 to
0.1 mm to the needle.
2. The upper edge of the needle eye should be 0.8 to 1.0 mm under the tip of the hook.
3. the needle guard 5 should lightly touch the needle.
●Loosen the screws 1 and 2.
●Move the needle bar to b.d.c. and slide the 1.8 mm thick feeler gauge with its cutout
tightly under the lower needle bar bearing. Move the screw clamp so that it touches the
feeler gauge and tighten it.
●Remove the feeler gauge and turn the handwheel in the direction of rotation until the
screw clamp rests on the needle bar bearing.
●Adjust the hook bearing bracket 3 according to rule 1.
●Tighten the screws 1
●Set the hook point on the middle of the needle and take care that the needle is not
squeezed by the needle guard 5.
●Tighten the screws 2, ensuring that the bevel gear 4 is not too tight, but that there is not
too much play on the hook.
●Adjust the needle height according to rule 2.
●Align the needle guard 5 according to rule 3.
Fig. 13 - 03
1
2
1
3
4
0.8 - 1 mm
0.05 - 0.1 mm
5

Adjustment
9
13.04.04 Bobbin case opener
●Thread the machine and insert the testing material.
●Sew a few stitches by turning the handwheel and carry out a check according to the rule.
●Turn the bobbin case opener 1 ( screw 2 ) according to the rule.
Fig. 13 - 04
2
1
3
4
Rule
The needle thread should not become jammed between the bobbin case opener 1 and
the bobbin case base 3 or between the retaining lug 4 and the retaining dog of the needle
plate.

Adjustment
10
13.04.05 Safety clutch
The safety clutch 4 is set ex works. If the thread jams, the safety clutch 4
disengages to avoid damage to the hooks. The process to engage the clutch is
described below.
●Remove the thread jam.
●Press the catch 1 and turn the handwheel until the pawl 2 engages in the groove 3.
Fig. 13 - 05
4
4
1
2
3

Adjustment
11
13.04.06 Presser stroke movement
Rule
The presser foot 3 and the tip of the needle should reach the stitch platen at the same
time when turning the handwheel.
●Slide the lever 1 (screw 2) in its slotted lever until you feel it reach the upper stop.
●Lower the presser foot 3 onto the needle plate.
●Loosen the screws 4 until the eccentric 5 is difficult to turn on the shaft.
●Turn the eccentric 5 according to the rule.
●Tighten the screws 4.
Fig. 13 - 06
1
2
54
3

Adjustment
12
13.04.07 Presser stroke
Rule
1. When the needle bar is in b.d.c., the clearance between the clamp 1 and needle plate
should be 172 mm.
2. The presser foot 5 should lift 20 mm off the needle plate in its upper turning point at
maximum stroke adjustment.
Fig. 13 - 07
●Move the needle bar to b.d.c.
●Adjust the clamp 1 (screws 2) according to rule 1.
●Slide the lever 3 (screw 4) in its slotted lever until you feel it reach the upper stop.
●Move the presser foot 5 to its upper turning point by turning the handwheel.
●Turn the crank 6 (screw 7) according to rule 2.
20 mm
172 mm
1
2
5
4
3
6
7

Adjustment
13
13.04.08 Needle thread tension release
Rule
1. The tension discs should start to open with the thread lever positioned 10 mm before
t.d.c.
2. When the thread lever is at t.d.c., there should be a clearance of 1.0 mm between the
tension discs.
●Adjust the thread lever to a position 10 mm before t.d.c.
●Turn the eccentric 1 (screws 2) according to rule 1.
●Turn the handwheel until the tension discs are at the maximum distance from each other.
●Move the thread tension (screw 3) according to rule 2.
Fig. 13 - 08
2
1
1.0 mm
3

Adjustment
14
Fig. 13 - 09
2
1
3
4
13.04.09 Thread check spring
●Adjust the stop 1 ( screw 2 ) according to the rule.
●Turn the screw 3 ( screw 4 ) to set the spring tension
The length of the thread check spring deflection may deviate slightly upwards or
downwards for reasons relating to the sewing technology.
Rule
The movement of the thread check spring 5 should be finished when the needle point
punctures the material (spring deflection = approx. 7 mm).
5
7 mm

Adjustment
15
Fig. 13 - 10
1
2
5
13.04.10 Bobbin winder
Rule
1. When the bobbin winder is switched on, the bobbin winder spindle should be moved
easily; when the bobbin winder is switched off, the friction wheel 5 must not touch
the drive wheel 1.
2. The bobbin winder should switch off automatically when the fill amount is still around
1 mm from the edge of the bobbin.
●Adjust the drive wheel 1 (screws 2) according to rule1.
●Adjust the bolt 3 (screws 4) according to rule 2.
3
4
1 mm

Adjustment
16
13.04.11 Presser foot pressure
Rule
The material should be transported properly even at top sewing speed.
No pressure marks should appear on the material.
●Turn the screw 1 according to the rule.
Fig. 13 - 11
1

Adjustment
17
13.05 Adjusting thread trimmer -900/56
13.05.01 Control cam ( pre-calibrating )
●Remove the catch 1 ( screws 2 ).
●Remove the plate 3 ( screws 4 ).
●Loosen the four screws of the control cam 5 and the screws 6 of the retaining collar 7.
●Move the control cam 5 sideways according to rule 1.
●Adjust the retaining collar 7 in this position so that it touches the control cam 5 and
tighten the screws 6.
●Move the thread lever to t.d.c. by turning the handwheel.
●Turn the control cam 5 in the direction of rotation according to rule 2, ensuring that it
rests on the retaining collar 7.
●Tighten the four screws of the control cam 5 in this position.
Rule
1. The bearing surface of the control cam 5 should be positioned centrally to the pawl
8 on the side.
2. When the thread lever is at t.d.c., the start of the largest eccentricity of the bearing
surface ( in the direction of rotation ) should be under the tip of the pawl 8.
Fig. 13 - 12
8
5
7
6
5
8
4
3
1
8
5
2

Adjustment
18
13.05.02 Tripping lever
Rule
The bevelled bolt of the tripping lever 6 (see arrow) should drop easily into the track of the
control cam 7 when the engaging lever 8 is activated in the needle rise position.
●Unscrew the screw 1 and swivel the connecting rod 2 away.
●Loosen the screws 3 and 4.
●Move the needle bar to the needle rise position by turning the handwheel.
●Move the clamping piece until it abuts the housing on the right.
●While maintaining this position, press the tripping lever 6 to the bottom of the cam track
and adjust according to the rule.
●Tighten the screw 3 in this position.
The screw 4 remains loosened to set the release cam.
Fig. 13 - 13
8
2
7
1
5
7
6
4
3

Adjustment
19
13.05.03 Pawl
Rule
There should be a clearance of 0.3 mm between the largest eccentricity of the control
cam 1 and the pawl 2 when the thread trimmer attachment is in the neutral position.
●Position the control cam 1 with its largest eccentricity under the pawl 2 by turning the
handwheel.
●Adjust the bearing bolt 3 (screw 4) according to the rule.
Fig. 13 - 14
13
2
0.3 mm
12
3
4

Adjustment
20
13.05.04 Engaging solenoid
Rule
There should be a clearance of 0.3 mm between the engaging lever 2 and the pawl 3 in
the needle rise position and when the engaging solenoid 5 is activated.
●Move the machine to the needle rise position by turning the handwheel.
●Loosen the screw 1 until the engaging solenoid is hard to push.
●Activate the engaging lever 2 by hand so that the pawl drops into place.
●Press the magnet armature 4 into the magnet housing 5 up to the stop and adjust the
magnet housing together with the magnet armature according to the rule.
●Tighten the screw 1 in this position.
Fig. 13 - 15
15
0.3 mm
2
3
4
5