Pfaff Industrial 1245 Guide

1245
1246
296-12-19 303/001
adjustment Manual engl. 10.15
This adjustment manual applies to machines
from the serial number 7262 454 and
software version 0435/002 onwards.
ADJUSTMENT MANUAL

Reprinting, reproduction and/or translation of PFAFF adjustment manuals (including parts
thereof) is only permitted with our prior agreement and citation of the source.
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 Feed dog position crossways to sewing direction................................................................. 6
13.04.02 Feed dog position in sewing direction ................................................................................... 7
13.04.03 Feed dog height..................................................................................................................... 8
13.04.04 Needle position to needle hole .............................................................................................. 9
13.04.05 Needle height (pre-calibrating) ............................................................................................. 10
13.04.06 Bottom and top feed sliding movement .............................................................................. 11
13.04.07 Bottom transporter stroke movement (only in machine versions with a P)......................... 12
13.04.08 Hook-to-needle clearance, needle bar rise, needle height and needle guard ...................... 13
13.04.09 Top feed lift.......................................................................................................................... 14
13.04.10 Top feed stroke movement ................................................................................................. 15
13.04.11 Bobbin case opener (make this adjustment on both bobbin case openers with the
Pfaff 1246) ........................................................................................................................... 16
13.04.12 Safety clutch ........................................................................................................................ 17
13.04.13 Needle thread tension release............................................................................................. 18
13.04.14 Thread check spring (with the PFAFF 1245 and PFAFF1246 without thread trimmer -900/56) . 19
13.04.15 Thread check spring (with the PFAFF 1246 with thread trimmer -900/56) ............................... 20
13.04.16 Bobbin winder...................................................................................................................... 21
13.04.17 Presser foot pressure .......................................................................................................... 22
13.05 Adjusting thread trimmer -900/56........................................................................................ 23
13.05.01 Control cam ( pre-calibrating ) .............................................................................................. 23
13.05.02 Tripping lever ....................................................................................................................... 24
13.05.03 Pawl ..................................................................................................................................... 25

Table of Contents
Contents..................................................................................Page
13.05.04 Engaging solenoid................................................................................................................ 26
13.05.05 Release cam ........................................................................................................................ 27
13.05.06 Engaging lever ..................................................................................................................... 28
13.05.07 Connecting rod .................................................................................................................... 29
13.05.08 Control cam (pre-calibrating) ................................................................................................ 30
13.05.09 Catch.................................................................................................................................... 31
13.05.10 Connecting rod (only with the PFAFF 1246) ........................................................................ 32
13.05.11 Thread catcher height (make this adjustment on both thread catchers
with the PFAFF 1246) ....................................................................................................................33
13.05.12 Knife (make this adjustment on both knives with the PFAFF 1246) .................................... 34
13.05.13 Thread catcher reverse position (make this adjustment on both thread catchers
with the PFAFF 1246) .......................................................................................................... 35
13.05.14 Bobbin thread clamp spring (make this adjustment on both clamp springs
with the PFAFF 1246) .......................................................................................................... 36
13.05.15 Tension release lever........................................................................................................... 37
13.06 Adjusting lifting lever with subclass -911/97........................................................................ 38
13.07 Adjusting lifting lever without subclass -911/97................................................................... 39
13.08 Parameter settings ............................................................................................................. 40
13.09 Internet update of control P40 CD ...................................................................................... 40
14 Circuit Diagrams 91-191 585-95 ....................................................................................... 41

Adjustment
5
13 Adjustment
The illustrations in this chapter show the PFAFF 1245 single- needle machine.
Various settings must be duplicated with the PFAFF 1246 two-needle machine,
i.e. in the left and right hook area.
An indication is given in the respective chapters where some illustrations are to
be considered as a mirror image.
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
O1 set of screwdrivers with knife widths from 2 to 10 mm
O1 set of wrenches with jaw widths from 7 to 14 mm
O1 set of Allen keys from 2 to 6 mm
O1 metal ruler (order no. 08-880 218-00)
ONeedle rise gauge (order no. 61-111 600-01)
OScrew clamp (order no. 61-111 600-35)
OTop feed lift gauge (order no. 61-111 633-61).
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 Feed dog position crossways to sewing direction
Rule
The bottom transporter should have the same clearance on the right and left in the needle
plate recess.
OLoosen both of the screws 1 and 2.
OAdjust the rock shaft 3 according to rule 1.
OTighten the screws 1
The surfaces of the tacks 4 must face the screws 1 and the rock shaft 3 must
have no backlash nor move sluggishly.
OThe screws 2 remain loosened for the subsequent adjustments.
Fig. 13 - 01
21
4
3
1
4

Adjustment
7
13.04.02 Feed dog position in sewing direction
Rule
The bottom transporter should have the same clearance at the front and back in the
needle plate recess in forward and reverse feed at the maximum stitch length setting.
OSet the maximum stitch length.
OTurn the rock shaft 1 according to the rule and tighten the screws 2.
Fig. 13 - 02
2
1

Adjustment
8
13.04.03 Feed dog height
Rule
The bottom transporter should protrude above the needle plate by the tooth height in its
upper turning point at stitch length regulation "0".
Fig. 13 - 03
2
1
OSet the stitch length to "0".
OMove the feed dog to its upper turning point by turning the handwheel.
OAdjust the bracket 1 (screws 2) according to the rule.
The feed dog height can be reduced slightly if required in machines without
a bottom feed lifting stage (without P).

Adjustment
9
13.04.04 Needle position to needle hole
Rule
The needle should pierce the middle of the needle hole exactly (with stitch length regulation "0").
Fig. 13 - 04
1
2
6
5
4
9
8
7
3
OUnscrew the top feed foot 1 and the presser foot 2.
OSet the stitch length to "0" and move the needle bar to t.d.c.
OInsert a new needle, loosen the screws 3, 4, 5 and 6.
OMove the needle directly over the needle hole by turning the handwheel.
OMove the needle bar frame 7 according to the rule.
OTighten the screws 3, 4 and 5.
OMove the stop 8 so that it touches the needle bar frame 7 and tighten the screws 6.
The needle bar frame 7 in the guide 9 and the top feed drive rods should move
easily.

Adjustment
10
13.04.05 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 15 mm.
OAdjust the needle bar 1 (screw 2) without twisting according to the rule.
Fig. 13 - 05
2
15 mm
1

Adjustment
11
13.04.06 Bottom and top feed sliding movement
Rule
The top and bottom feed should not move when the reverse-feed lever is activated with
maximum stitch length regulation and when the needle bar is in b.d.c.
OSet the maximum stitch length.
OLoosen the screws 1 only to such an extent that the eccentric 2 is difficult to turn on the
shaft.
OMove the needle bar to b.d.c.
OWhile maintaining this position, initially position the eccentricity of the eccentric 2 to "up"
and then adjust it slightly so that it complies with the rule when the reverse-feed lever is
activated.
OTighten the screws 1.
Fig. 13 - 06
1
2

Adjustment
12
13.04.07 Bottom transporter stroke movement (only in machine versions with a P)
2
1
Fig. 13 - 06
OMove the needle bar to b.d.c.
OTurn the eccentric 1 (screws 2) according to rule 1.
OTighten the accessible screw 2 in this position so that the eccentric 1 is still difficult to
turn.
OTurn the eccentric 1 a little further according to rule 2.
OTighten both the screws 2.
Rule
1. The bottom transporter should be in its upper turning point when the needle bar is in
b.d.c.
2. The tooth tips of the feed dog should be at the same level as the surface of the needle
plate with maximum stitch length regulation, when the needle points pierce the middle
of the needle holes.

Adjustment
13
13.04.08 Hook-to-needle clearance, needle bar rise, needle height and needle guard
(The setting of the left hook is omitted with the PFAFF 1245)
Rule
When the needle rise is positioned 2.0 mm after b.d.c. of the needle bar and with stitch
length regulation "3",
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.
OSet the stitch length to "3".
OLoosen the screws 1, 2 and 3.
OMove the needle bar to b.d.c. and slide the feeler gauge corresponding to the version
with its recess tightly under the lower needle bar bearing. Move the screw clamp so that
it touches the feeler gauge and tighten it.
ORemove the feeler gauge and turn the handwheel in the direction of rotation until the
screw clamp rests on the needle bar bearing
OAdjust the hook bearing bracket 4 according to rule 1.
OTighten the screws 1
OSet the hook point on the middle of the needle and take care that the needle is not
squeezed by the needle guard 5.
OTighten the screws 2, ensuring that the bevel gear 6 is not too tight, but that there is not
too much play on the hook.
OAdjust the retaining collar 7 up against the bevel gear 6 and tighten the screws 3.
OAdjust the needle height according to rule 2.
OAlign the needle guard 5 according to rule 3.
With the PFAFF 1246 it is important to readjust the position of the connecting
rod to the thread trimmer attachment after changing the needle gauge (see
chapter 13.05.10 Connecting rod) .
Fig. 13 - 08
2
6
3
4
11
11
0.8 - 1 mm
0.05 - 0.1 mm
5
4
2
3
77
6

Adjustment
14
13.04.09 Top feed lift
Rule
The presser foot 1 and top feed foot 2 should each lift 7.0 mm off the needle plate when
turning the handwheel at the maximum top feed lift position and when the stitch length
is set to "0".
OSet the maximum top feed lift and set the stitch length to "0".
OFit the presser foot 1.
OTurn the handwheel in the direction of rotation until the top feed foot 2 has reached its
highest point.
OTurn the crank 3 (screws 4) according to the rule.
OCarry out a check according to the rule.
Fig. 13 - 09
1
2
3
4

Adjustment
15
13.04.10 Top feed stroke movement
Rule
The presser foot 6 and the needle point should reach the needle plate at the same time at
maximum top feed lift if the presser foot 1 rests on the needle plate.
OLoosen the screw 1.
OSlide the lever 2 in its slotted lever until you feel it reach the upper stop (maximum top
feed lift); tighten the screw 1.
OLower the presser foot 3 onto the needle plate.
OLoosen the screws 4 until the eccentric 5 is difficult to turn.
OTurn the eccentric 5 according to the rule.
OTighten the screws 4.
OCarry out a check according to the rule.
Fig. 13 - 10
12
3
4
6
5

Adjustment
16
13.04.11 Bobbin case opener (make this adjustment on both bobbin case openers with the
Pfaff 1246).
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.
OThread the machine and insert the testing material.
OFit the sewing foot.
OSew a few stitches by turning the handwheel and carry out a check according to the
rule.
OTurn the bobbin case opener 1 (screw 2) according to the rule.
Fig. 13 -11
2
1
3
4

Adjustment
17
13.04.12 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.
ORemove the thread jam.
OPress the catch 1 and turn the handwheel until the pawl 2 engages in the groove 3.
Fig. 13 - 12
44
1
2
3

Adjustment
18
13.04.13 Needle thread tension release
Rule
When the presser foot is raised, both tension discs should be at least 0.5 mm apart.
ORaise the presser foot with the hand lever.
OAlign the pressure plate 1 behind the tension mounting plate 2 according to the rule.
The release pin 3 must not be loaded with effective tension.
The clearance of 0.5 mm is the minimum size and may be over 1 mm with
thick types of yarn.
Fig. 13 -13
2
1
3
0.5 mm

Adjustment
19
13.04.14 Thread check spring (with the PFAFF 1245 and PFAFF1246 without thread trimmer -900/56)
OAdjust the stop 1 (screw 2) according to the rule.
OTurn 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).
Fig. 13 - 14
2
134
5
7 mm

Adjustment
20
13.04.15 Thread check spring (with the PFAFF 1246 with thread trimmer -900/56)
OTurn the screw 2 (screw 3) to set the spring tension of the thread check spring 1.
OTurn the support 4 (screw 5) according to the rule.
OTurn the screw 7 (screw 8) to set the spring tension of the thread check spring 6.
OTurn the support 9 (screw 10) according to the rule.
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 springs 1 and 6 should be finished when the needle
points puncture the material (spring deflection = approx. 7 mm).
Fig. 13 - 15
2
1
3
7 mm
6
49
7
5
810