Pfaff 1246 User Manual
1245
1246
ADJUSTMENT MANUAL
This adjustment manual applies to machines
from the following serial numbers onwards:
# 6 500 124
296-12-19 200/002
Justieranleitung engl. 01.12
The reprinting, copying or translation of PFAFF Instruction 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 ........................................................................................................................... 4
1.01 Tools, gauges and other accessories for adjusting ............................................................... 4
1.02 Abbreviations ......................................................................................................................... 4
1.03 Explanation of the symbols .................................................................................................... 4
1.04 Adjusting the basic machine .................................................................................................. 5
1.04.01 Positioning the feed dog across the direction of sewing ....................................................... 5
1.04.02 Positioning the feed dog in the direction of sewing .............................................................. 6
1.04.03 Height of the bottom feed-dog ............................................................................................. 7
1.04.04 Pre-adjusting the needle height ............................................................................................. 8
1.04.05 Centering the needle in the needle hole ................................................................................ 9
1.04.06 Lifting motion of the bottom feed-dog. ................................................................................ 10
1.04.07 Driving motion of the bottom and top feeds ........................................................................ 11
1.04.08 Hook-to-needle clearance, needle rise, needle height and needle guard ............................ 12
1.04.09 Top-feed stroke .................................................................................................................... 14
1.04.10 Lifting motion of the top feed ............................................................................................. 15
1.04.11 Bobbin-case opener ............................................................................................................. 16
1.04.12 Safety clutch ........................................................................................................................ 17
1.04.13 Needle thread tension release ............................................................................................. 18
1.04.14 Bobbin winder ...................................................................................................................... 19
1.04.15 Presser-foot pressure ...........................................................................................................20
3
Adjustment
1 Adjustment
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 refi tted
properly after adjustment, see Chapter 1.06 Danger warnings of the instruction
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!
The illustrations in this section show the PFAFF 1245 single-needle machine.
For the PFAFF 1246 two-needle machine, various adjustments must be made
twice, i.e. to the left- and right-hand sewing hooks. This will be pointed out in
the respective sections, whereby it is often possible to apply the mirror image
of the illustrations.
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 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 for adjusting
● Screwdrivers withi blade widths from 2 to 10 mm
● Spanners (wrenches) in sizes from 7 to 14 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)
1.02 Abbreviations
t.d.c. = top dead centre
b.d.c. = bottom dead centre
1.03 Explanation of the symbols
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)
4
Adjustment
1.04 Adjusting the basic machine
1
.04.01 Positioning the feed dog across the direction of sewing
Requirement
The bottom feed dog must be the same distance from the left and right side of the need-
le-plate cutout.
3
4
Fig. 1 - 01
● Loosen screws 1 and 2.
● Laterally align rock shaft 3 in accordance with the requirement.
● Now tighten screws 1.
● Screws 2 remain loose for the following adjustments..
1
The fl at sides of pins 4 must be opposite the fl at sides of screws 1 and rock
shaft 3 must exhibit neither play nor stiffness.
4
2
1
5
Adjustment
1.04.02 Positioning the feed dog in the direction of sewing
Requirement
With the longest stitch set, the bottom feed dog must have the same clearance the front
and the back with respect to the needle-plate cutout when feeding both forwards and
backwards.
1
2
Fig. 1 - 02
● Set the longest stitch.
● Adjust rock shaft 1 in accordance with the requirement and tighten screws 2.
6
Adjustment
1.04.03 Height of the bottom feed-dog
Requirement
With the stitch length set at "0", the bottom feed dog must protrude over the needle plate
as high as the teeth when at TDC.
21
Fig. 1 - 03
● Set stitch length "0".
● Bring the bottom feed dog to its TDC by turning the handwheel.
● Adjust feed dog carrier 1 (screws 2) in accordance with the requirement.
If required, the feed dog height can be reduced a little on machines without a
bottom feed lifting phase (without P).
7
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