Pfaff 1296 User Manual
1295
Industrial
®
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
The reprinting, copying or translation of PFAFF Adjustment 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
Contents
Contents ............................................................................... Chapter - Page
13
13.01 Notes on adjustment ................................................................................................ 13 - 1
13.02 Tools, gauges and other equipment .......................................................................... 13 - 1
13.03 Abbreviations ............................................................................................................ 13 - 1
13.04 Explanation of the symbols ...................................................................................... 13 - 1
13.05 Adjusting the basic machine ................................................................................. 13 - 2
13.05.01 Position of the bottom feed dog crosswise to sewing direction ................................ 13 - 2
13.05.02 Adjusting the bottom feed dog in sewing direction .................................................... 13 - 3
13.05.03 Bottom feed dog height ............................................................................................ 13 - 4
13.05.04 Needle height (preliminary adjustment) ..................................................................... 13 - 5
13.05.05 Needle in needle-hole centre ..................................................................................... 13 - 6
13.05.06 Bottom feed dog lifting motion .................................................................................. 13 - 7
13.05.07 Feeding stroke of bottom and top feeds .................................................................... 13 - 8
13.05.08 Hook clearance, needle rise, needle height and needle guard ................................... 13 - 9
13.05.09 Top feed stroke ......................................................................................................... 13 - 11
13.05.10 Top feed lifting motion .............................................................................................. 13 - 12
13.05.11 Bobbin case opener .................................................................................................. 13 - 13
13.05.12 Slip coupling ............................................................................................................. 11 -14
13.05.13 Needle-thread tension release ................................................................................... 13 - 15
13.05.14 Thread check spring, without subclass -900/56 ........................................................ 13 - 16
13.05.15 Thread check spring on the PFAFF 1296 with subclass -900/56 ............................... 13 - 17
13.05.16 Bobbin winder .......................................................................................................... 13 - 18
13.05.17 Pressure of the lifting presser ................................................................................... 11 - 19
Adjustment .............................................................................................................. 13 - 1
13.06 Adjusting the thread trimmer -900/56 ........................................................................ 13 - 20
13.06.01 Engaging solenoid ..................................................................................................... 13 - 20
13.06.02 Control cam (preliminary adjustment) ....................................................................... 13 - 21
13.06.03 Control lever spring action ........................................................................................ 11 - 22
13.06.04 Control lever stroke .................................................................................................. 13 - 23
13.06.05 Thread-trimmer drive linkage .................................................................................... 13 - 24
13.06.06 Linkage bar (only on the PFAFF 1296) ....................................................................... 13 - 25
13.06.07 Thread catcher height ............................................................................................... 13 - 26
13.06.08 Thread catcher resting position ................................................................................. 13 - 27
13.06.09 Knife pressure .......................................................................................................... 13 - 28
13.06.10 Bobbin thread trapping spring ................................................................................... 13 - 29
13.06.11 Control cam (final adjustment) .................................................................................. 13 - 30
13.06.12 Release lever............................................................................................................ 11 - 31
13.06.13 Release rod .............................................................................................................. 13 - 32
13.07 Parameter settings ................................................................................................... 13 - 33
13.07.01 Parameter list ........................................................................................................... 13 - 33
14 Circuit diagrams ....................................................................................................... 14 - 01
Adjustment
13 Adjustment
13.01 Notes on 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
referred to in the different chapters.
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
loosened before adjustment and tightened again afterwards.
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 Abbreviations
t.d.c. = top dead centre
b.d.c. = bottom dead centre
13.04 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
13 - 1
Service, repair, adjustment, maintenance
(work to be carried out by qualified staff only)
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
Adjustment
Fig. 11 - 01
1
X
X
3
2
4
1
● 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
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
Fig. 11 - 02
● Set the longest stitch length.
● Turn rock shaft 1 according to Requirement. and tighten screws 2.
2
13 - 3
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.
tooth height
Adjustment
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
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
Fig. 11 - 04
● Re-position the height of needle bar 1 (screws 2) according to Requirement, but do not
turn it.
1
15 mm
13 - 5
1
2
3
0
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.
Adjustment
4
3
7
5
6
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
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
13 - 7
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.
13.05.07 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.
Adjustment
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
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
8
6
2
7
3
6
23
1
7
1
1
4
5
0.8 - 1 mm
13 - 9
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.
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
height preliminary adjustment).
● 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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