®
Industrial
1295
1296
ADJUSTMENT MANUAL
This Adjustment Manual is valid for machines
from the following serial numbers onwards:
# 2 730 099
296-12-18 640/002
Justieranleitung engl. 06.09
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Contents
Contents ............................................................................... Chapter - Page
13
Adjustment .............................................................................................................. 13 - 1
Notesonadjustment ................................................................................................ 13 - 1
Tools, gauges and other equipment .......................................................................... 13 - 1
Abbreviations............................................................................................................ 13 - 1
Explanation of the symbols ...................................................................................... 13 - 1
13.01
13.02
13.03
13.04
13.05
Adjusting the basic machine ................................................................................. 13 - 2
Position of the bottom feed dog crosswise to sewing direction ................................ 13 - 2
Adjusting the bottom feed dog in sewing direction.................................................... 13 - 3
Bottomfeeddogheight ............................................................................................ 13 - 4
Needleheight(preliminaryadjustment)..................................................................... 13 - 5
Needleinneedle-holecentre ..................................................................................... 13 - 6
Bottomfeeddogliftingmotion.................................................................................. 13 - 7
Feeding stroke of bottom and top feeds.................................................................... 13 - 8
Hook clearance, needle rise, needle height and needle guard ................................... 13 - 9
Topfeedstroke......................................................................................................... 13 - 11
Topfeedliftingmotion .............................................................................................. 13 - 12
Bobbin case opener .................................................................................................. 13 - 13
Slipcoupling ............................................................................................................. 11 -14
Needle-threadtensionrelease................................................................................... 13 - 15
Thread check spring, without subclass -900/56 ........................................................ 13 - 16
Thread check spring on the PFAFF 1296 with subclass -900/56 ............................... 13 - 17
Bobbinwinder .......................................................................................................... 13 - 18
Pressure of the lifting presser ................................................................................... 11 - 19
13.05.01
13.05.02
13.05.03
13.05.04
13.05.05
13.05.06
13.05.07
13.05.08
13.05.09
13.05.10
13.05.11
13.05.12
13.05.13
13.05.14
13.05.15
13.05.16
13.05.17
13.06
Adjustingthethreadtrimmer-900/56........................................................................ 13 - 20
Engagingsolenoid..................................................................................................... 13 - 20
Control cam (preliminary adjustment) ....................................................................... 13 - 21
Control lever spring action ........................................................................................ 11 - 22
Controlleverstroke .................................................................................................. 13 - 23
Thread-trimmerdrivelinkage .................................................................................... 13 - 24
Linkage bar (only on the PFAFF 1296)....................................................................... 13 - 25
Threadcatcherheight ............................................................................................... 13 - 26
Threadcatcherrestingposition ................................................................................. 13 - 27
Knifepressure .......................................................................................................... 13 - 28
Bobbinthreadtrappingspring ................................................................................... 13 - 29
Control cam (final adjustment).................................................................................. 13 - 30
Release lever............................................................................................................ 11 - 31
Release rod .............................................................................................................. 13 - 32
13.06.01
13.06.02
13.06.03
13.06.04
13.06.05
13.06.06
13.06.07
13.06.08
13.06.09
13.06.10
13.06.11
13.06.12
13.06.13
13.07
13.07.01
Parametersettings ................................................................................................... 13 - 33
Parameter list ........................................................................................................... 13 - 33
14
Circuit diagrams ....................................................................................................... 14 - 01
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Adjustment
13
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 refitted
properly after adjustment, see Chapter 1.06 Danger warnings of the instruction
manual!
Unless stated otherwise, during all adjustment work the machine must be
disconnected from the electric and pneumatic power supply!
Danger of injury if the machine is started accidentally!
For the adjustments in this chapter the PFAFF 1296 two-needle machine is
illustrated. On the PFAFF 1295 single-needle machines various adjustments only
have to be carried out on one side, i.e. in the right-hand hook area. This is
referredtointhedifferentchapters.
13.01
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
adjustments, 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 specific 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
loosenedbeforeadjustmentandtightenedagainafterwards.
13.02
Tools, gauges and other equipment
● Screwdrivers withi blade widths from 2 to 10 mm
● Spanners (wrenches) in sizes from 7 to 13 mm
● Allen keys from 1.5 to 6 mm
● Metal rule (part No. 08-880 218-00)
● Needle-rise gauge (part No. 61-111 600-01)
● Gauge, (top feed stroke 7 mm) (Part No. 61-111 633-61)
● Screw clamp (part No. 61-111 600-35)
13.03
13.04
Abbreviations
t.d.c. = top dead centre
b.d.c. = bottom dead centre
Explanation of the symbols
In this adjustment manual, symbols emphasize operations to be carried out or important
information. The symbols used have the following meaning:
Note,information
Service, repair, adjustment, maintenance
(work to be carried out by qualified staff only)
13 - 1
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Adjustment
13.05
Adjusting the basic machine
13.05.01
Position of the bottom feed dog crosswise to sewing direction
Requirement
The bottom feed dog must be the same distance from the left and right side of the feed slots.
4
1
X
X
2
4
1
3
Fig. 11 - 01
● Loosen screws 1 and 2.
● Position rock shaft 3 according to Requirement..
● Tighten screw 1.
The flats of pins 4 must face screws 1 and rock shaft 3 must neither have any
play nor bind.
Leave screws 2 loose for the following adjustments.
13 - 2
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Adjustment
13.05.02
Adjusting the bottom feed dog in sewing direction
Requirement
With the longest stitch length set, the bottom feed dog must not strike the feed slot at the
front or rear end of its stroke.
1
2
Fig. 11 - 02
● Set the longest stitch length.
● Turn rock shaft 1 according to Requirement. and tighten screws 2.
13 - 3
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Adjustment
13.05.03
Bottom feed dog height
Requirement
With the stitch length set at "0" the feed dog must protrude from the needle plate by the
height of its teeth when at its highest position.
2
1
Fig. 11 - 03
● Set stitch length „0“.
● Turn the balance wheel to set the bottom feed dog at its highest position.
● Adjust bracket 1 (screws 2) according to Requirement.
On machines without bottom-feed lifting phase (without "P") the feed dog
height may be reduced somewhat if necessary.
13 - 4
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Adjustment
13.05.04
Needle height (preliminary adjustment)
Requirement
With the needle bar at b.d.c. the clearance between needle bar and needle plate must be
15 mm.
2
1
1
Fig. 11 - 04
● Re-position the height of needle bar 1 (screws 2) according to Requirement, but do not
turn it.
13 - 5
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Adjustment
13.05.05
Needle in needle-hole centre
Requirement
With the stitch length set at "0" the needle must enter exactly in the centre of the needle
hole.
4
3
0
1
2
3
7
6
5
8
9
1
2
Fig. 11 - 05
● Remove vibrating presser 1 and lifting presser 2.
● Set the stitch length at "0" and set the needle bar at t.d.c.
● Insert a new needle, loosen screws 3, 4, 5 and 6.
● Turn the balance wheel to set the needle immediately above the bottom feed dog.
● Shift the position of needle bar frame 7 according to Requirement.
● Tighten screws 3, 4 and 5.
● Move stop 8 up against needle bar frame 7 and tighten screw 6.
There must be no binding of needle bar frame 7 in guide 9 nor in the top-feed
drive linkages.
13 - 6
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Adjustment
13.05.06
Bottom feed dog lifting motion
Requirement
1. With the needle bar at b.d.c. the feed dog must be at its highest position.
2. When the longest stitch length is set and the balance wheel is turned, the bottom feed
dog must reach the top side of the needle plate at the same time as the needle.
1
2
Fig. 11 - 06
This adjustment does not apply to machines without bottom-feed dog lifting
phase (without "P")
● Set needle bar at b.d.c.
● Turn eccentric 1 (screws 2) according to Requirement 1.
● In this position tighten the accessible screw 2 just enough to allow eccentric 1 to be
turned against a resistance.
● Turn eccentric 1 slightly according to Requirement 2.
● Tighten both screws 2.
13 - 7
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Adjustment
13.05.07
Feeding stroke of bottom and top feeds
Requirement
With the longest stitch length set and the needle bar at b.d.c. neither the top- nor bottom
feed must make any movement when the reverse-feed lever is operated.
2
1
Fig. 11 - 07
● Set the longest stitch length.
● Undo screw 1 enough to allow eccentric 2 to be turned on the shaft against a resistance.
● Set needle bar at b.d.c.
● First turn eccentric 2 so that its highest eccentric point is facing "downwards."
● Now turn it slightly in rotation direction according to Requirement.
● Tighten screw 1.
13 - 8
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Adjustment
13.05.08
Hook clearance, needle rise, needle height and needle guard
Requirement
With the stitch length set at "3" and in needle-rise position (= 1.8 mm past b.d.c. on version
"B" or 2.0 mm past b.d.c. on version "C")
1. The hook point must be at the "needle centre" and the clearance between hook and
needle 0.05 to 0.1 mm,
2. the top end of the needle eye must be 0.8 to 0.1 mm below the hook point, and
3. needle guard 8 must touch the needle just lightly.
0.05 - 0.1 mm
1
1
8
6
7
7
6
2
3
2
3
1
1
4
5
Fig. 11 - 08
● Set the stitch length at "3" and loosen screws 1, 2 and 3.
● Loosen screws 4 at the front and rear side.
● Position posts 5 according to Requirement 1.
● Tighten screws 1 and 4.
● Set the needle bar at b.d.c. and place the 1.8 or 2.0 mm thick feeler gauge close under
the needle bar bearing, move the screw clamp up against the feeler gauge and screw it
tight.
● Remove the feeler gauge and turn the balance wheel in sewing direction until the screw
clamp is against the needle bar bearing.
13 - 9
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Adjustment
● Set the hook point at the needle centre, making sure that the needle is not deflected by
needle guard 8.
● Making sure that bevel gear 6 is not too close, but the hook has not too much play,
tighten screws 2.
● Move fixing collar 7 up against bevel gear 6 and tighten screws 3.
● Adjust the needle height according to Requirement 2 (see also Chapter 13.04.04, Needle
heightpreliminaryadjustment).
● position needle guard 8 according to Requirement 3.
After changing the needle clearance be sure to readjust the connecting linkage
of the thread trimmer mechanism (see also Chapter 13.05.6, Connecting
linkage).
13 - 10
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Adjustment
13.05.09
Top feed stroke
Requirement
With the longest top feed stroke set and the stitch length at "0", lifting presser 1 and
vibrating presser 2 must each rise from the needle plate by 7.0 mm when the balance
wheel is turned.
4
3
2
1
Fig. 11 - 09
● Set the longest top feed stroke and stitch length "0".
● Lower lifting presser 1.
● Turn the balance wheel in sewing direction until vibrating presser 2 has reached its
highest point.
● Turn crank 3 (srews 4) according to Requirement.
13 - 11
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Adjustment
13.05.10
Top feed lifting motion
Requirement
When lifting presser 1 is resting on the needle plate, vibrating presser 4 and needle point 5
must reach the needle plate at the same time at the highest top feed stroke.
3
2
5
1
4
Fig. 11 - 10
● Lower lifting presser 1 onto the needle plate.
● Loosen screws 2 just enough to allow eccentric 3 to be turned against a resistance on it
shaft.
● Turn eccentric 3 according to Requirement.
● Tighten screws 2.
13 - 12
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Adjustment
13.05.11
Bobbin case opener
Requirement
The needle thread must neither be trapped between bobbin case opener 3 and hook base
4 nor between position finger 5 and the retainer on the needle plate (see arrows).
2
6
5
1
3
4
Fig. 11 - 11
● Undscrew and remove post covers 1 (on left post from the rear).
● Undo screws 2 enough to allow bobbin case opener 3 to be turned on its shaft against a
resistance.
● Thread up the machine, place sewing material in and lower the lifting presser.
● Set bobbin case opener 3 according to Requirement.
● In this position, apply pressure on the bobbin case opener from the top, move clamp
collar 6 up against it and tighten screws 2.
13 - 13
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Adjustment
13.05.12
Slip coupling
Slip coupling 4 is adjusted at the works. When a thread jams, slip coupling 4
disengages, in order to avoid damage to the hooks. To engage the coupling
again, proceed as follows.
1
4
2
3
4
Fig. 11 - 12
● Remove jammed thread.
● Press plunger 1 and turn the balance wheel until pawl 2 engages groove 3.
13 - 14
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Adjustment
13.05.13
Needle-thread tension release
Requirement
With the lifting presser raised, there must be a clearance of at least 0.5 mm between
tension discs 4.
2
0.5 mm
1
3
4
Fig. 11 - 13
● Position pressure plate 1 behind mounting bracket 2 according to Requirement.
The clearance of 0.5 mm is a miminum setting and may be as much as 1 mm
for heavy threads.
When the tension is engaged, release pin 3 must not be under load.
13 - 15
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Adjustment
13.05.14
Thread check spring, without subclass -900/56
Requirement
The movement of thread check spring 5 must be finished when the needle pointe enters
the material (=spring stroke of about 7 mm).
5
3
1
2
4
Fig. 11 - 14
● Adjust stop 1 (screw 2) according to Requirement.
● To adjust the pressure of the spring, turn screw 3 (screw 4).
For technical reasons the length of the thread check spring stroke may vary
upwards or downwards a little.
13 - 16
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Adjustment
13.05.15
Thread check spring on the PFAFF 1296 with subclass -900/56
Requirement
The movements of thread check springs 1 and 6 must be finished when the needle points
enter the material (=spring stroke of about 7 mm).
8 10
5
1
6
4
2
7
9
3
Fig. 11 - 15
● To adjust the pressure of spring 1, turn screw 2 (screw 3).
● Adjust stop 4 (screw 5) according to Requirement.
● To adjust the pressure of spring 6, turn screw 7 (screw 8).
● Adjust stop 9 (screw 10) according to Requirement.
For technical reasons the length of the thread check spring stroke may vary
upwards or downwards a little.
13 - 17
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Adjustment
13.05.16
Bobbin winder
Requirement
1. With the bobbin winder engaged, drive wheel 1 must be driven reliably.
2. With the bobbin winder disengaged, friction wheel 5 must not run against drive wheel 1.
3. The bobbind winder must switch itself off when the filled thread is about 1 mm from
the rim of the bobbin.
1
5
2
4
3
Fig. 11 - 16
● Re-position drive wheel 1 (screws 2) according to Requirements 1 and 2.
● Re-position pin 3 (screw 4) according to Requirement 3.
13 - 18
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Adjustment
13.05.17
Pressure of the lifting presser
Requirement
1. The material must be properly fed, even at the highest sewing speed.
2. There must be no pressure marks on the material.
1
Fig. 11 - 17
● Turn screw 1 according to the Requirement.
13 - 19
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