Pfaff 436 User manual

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PFAFF 436
One Needle Locksfifch Superspeed Sewer
with Automatic Lubrication
INSTRUCTION BOOK
G. M. PFAFF AG, Sewing Machine Factory, KAISERSLAUTERN
>/- •
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Ind ex
Section
Brief Description of the Machine
Varieties of the PFAFF 435
1. Setting Up the Machine
2. Filling In the Oil
3. Testing the Machine
4. Taking Qjt the Bobbin Case Cover ...
5. Winding the Bobbin
6.
Threading the Bobbin Case
7. Threading the Needle
8. Drawing Up the Bobbin Thread
9. Regulating the Thread Tensions .
10. Regulating the Pressure on the Material
11. Choosing the Proper Needle
12. Changing the Needle
13. Regulating the Length of Stitch .
14. The Knee Lifter
15. The Hook
16. The Mechanical Opener
17. Tilting the Head of the Machine . . . .
18. Taking the Hook Apart
19. Service and Maintenance
Instructions for Mechanics
20. The V-Belt Drive
21. Regulating the Automatic Lubrication System
22. Regulating the Lubrication of the Head Parts
23. Regulating the Lubricalion of the Hook . . .
24. Changing the Oil
Page
2
2
2
3
10
11
12
13
14
14
14
15
16
18
20
21
22
23
25
25. Regulating the Throw of the Threcid Check Spring 25
26. Setting the
Needle Bar at Correct Height .
27. Timing the Hook
28. Changing the Hook
29. Timing the Mechanical Opener ....
30. Disassembling the Link Take-up ....
31. Adjusting the Length of Stitch for Forward and Reverse Feeding
32. Removing the Oil Reservoir and Taking the Oil Pump Apart
33. Probable Causes of Sewing Troubles .
27
28
29
29
31
34
35
36
From the library of: Superior Sewing Machine & Supply LLC

Instruction Book
PFAFF 436
One Needle Lookstifch Superspeed Sewer
with Automatic Lubrication
This Instruction Book contains useful instructions for
operators and mechanics alike and therefore should be
made available to both rather than put away In your files.
From the library of: Superior Sewing Machine & Supply LLC

PFAFI= 436
Brief Descrlpfion of the Machine
The PFAFF436 One Needle Lockstitch Superspeed Sewing Machine, fitted
with link take-up and horizontal rotary hook, in its mechanical set-up may
be regarded as an improved model of the PFAFF 134. The high sewing speed
of this machine, ranging from 4,000 to 5,000 stitches per minute depending
on the grade of material sewn, has mode it mandatory that it be provided
with a forced feed lubrication system.
Since the manipulations required for this machine, such as for threading
the needle, regulating the length of stitch, and tying off seams, have not
been changed, operators need not bs retrained and expenses for such re
training are eliminated.
With its
modern, functional design, sturdy construction, and its sewing
properties of highest perfection, this machine satisfies any demand in all
branches of the sewing industry.
Variefies off the PFAFF 436
The PFAFF 436 is availoble in the following three varieties:
Model
Class of Work
Maximum
Length of Stifch
(Stitches p.
Indit
Maximum
Speed (Stitches
per Minute)
Needle
System
Presser Foot
Clearence
A
Sheer, light
weight fobrics 75,000
133 R
''Ua"
BMedium
weight
fabrics
64,800
134 R
CMedium
heavy
fabrics
5'/,
4,500 134 R"/ic '
The above models of the PFAFF 436 differ in regard to the maximum
length of stitch, the needle bar rise, the presser foot clearance, and the
take-up motion, and thereby are particularly adapted to the class of work
they are intended for.
1. Setting Up the Machine
In most instances the PFAFF 436 is fitted for individual power drive to
be
set up on on individual power table.
The machine is driven by a '/» HP motor, friction clutch type. (Type of
current and tension optional to suit local requirements).
Power is transmitted from the motor to the sewing machine by means
of a V-belt, 2V0.1" wide (DIN 2215).
For 50 cycle current, a motor performing 2,800 R.P.M. should be used,
whereas for 60 cycle current, a motcr performing 3,400 R.P.M. would be
appropriate.
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The motor pulley can easily be exchanged to alter the maximum number
of stitches
per minute of the machine.
The below table should be consulted for all data regarding the maximum
number of stitches obtainable in relation to the various motor pulley diame
ters.
Diameter of
Balar^ce Wheel
50 Cycles 60 Cycles
Diameter of
Motor Pulley
Stitches
per Minute
Diameter of
Motor Pulley
Stitdies
per Minute
(64 mm)
3'Vei" (95 mm)
3'"/ic" (100mm)
4'Vg4" (106mm)
4%2" (112mm)
4 (118 mm)
4,200
4,400
4,600
4,800
5,100
3 (80 mm)
3'Vn2" (85 mm)
3
35/^,," (90 mm)
3^'/c.i" (95 mm)
3";ic" (100 mm)
4,200
4,500
4,800
5,000
5,300
Head and stand are packed separately. The head should be unpacked
very carefully lo avoid damage. After taking off the lid of the box, unscrew
the wood screws holding the cushioned wooden blocks supporting the
machine head inside the box. Take the head out carefully, remove the dust
thoroughly, and set it up on the rubber pads on the table. To facilitate
mounting the rubber V-belt, place the belt on the machine pulley, lift up
the motor somewhat, and than pull the belt on the motor pulley. Setting
the V-belt tension is instructed in Section 20.
The machine Is dispatched without oil filling in the oil reservoirs and must
not be run while in this condition!
2. Filling In ihe Oil
The amount of oil required for the first two fillings comes with the
machine in a can. It is a spindle oil, viscosity 3.2° Engler
at 20° C, which
has proved very satisfactory for the lubrication of the PFAFF 436. To fill
Photo 1
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in the oil, proceed as follows: Remove screw d (Photo 1), fill in about 1pint
(0.5 1) of oil, and wait a few minutes until it has accumulated in the oil
reservoir. Now check at the oil level gauge in the front of the oil reservoir
(Photo 2) if the amount of oil filled in is sufficient. The oil level should be
between the two marks indicating the maximum and minimum levels of 0.6
and 0.3 I respectively with the machine being idle. Under no circumstances
should the top cover be removed and oil be filled in there. Experience fias
shown that it is of advantage to lubricate the hook separately. Oil reservoir
b serving this purpose is on top of the machine arm (Photo 1). To fill up the
hook oil, remove screw c, and fill in approximately 4.5—4.9 cu. in. (75—80
cm^) of oil. ,As long
as the red point of the float .spindle is visible in the
oil level tube while the machine is in operation, there is sufficient oil in the
reservoir. If, however, the red point of .the float spindle is flush with the
top surface of the oil sealer nut, oil should be filled up.
Photo 2
3. Testing the Machine
It Is recommended to test-run the machine with thread and bobbin case
removed. First of all, however, make sure that the line voltage corresponds
with the voltage given on the rating plate of the motor, and that the ma
chine pulley rotates in the proper direction, i. e. toward the operator. Never
must the motor rotate in reverse direction. Therefore, before running the
machine, cut in the
motor, hold the balance wheel with your right hand, tip
on the
treadle, and make sure by the jerk of the balance wheel that it
rotates in the proper direction. If not, simply exchange the two motor ter
minals. Now press down the treadle and, while running the machine, check
ot the oil gauge dome on the top of the machine arm if the pump works
correctly (indicator cap in top position).
For regulating the hook lubrication
system, see Section 23.
Note: Never run the machine unless a piece of fabric is inserted under
the presser foot or the latter is raised.
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4. Taking Ouf fhe Bobbin Case Cover
Raise the thread take-up to its highest position, open the bobbin case
latch with the thumb nail of your left hand, and, by means of this lotch,
pull the
bobbin case cover out as shown in photo 3.
Note: As long as the latch is open, the bobbin cannot fall out of the
bobbin case.
iilTiTIM
SYSTEM ISA-
Photo 3
5. Winding the Bobbin
For this operation the bobbin winder for power drive (Photo 4) is used
which features a number of improvements.
The bobbin winder spindle runs in a sintered steel bushing making lubrica
tion of the winder completely superfluous.
To reduce the high speed somewhat, the diameter of the bobbin winder
pulley has been increased to
The rim of the pulley was given a V-shaped profile so as to make the
concave bottom surface of the V-belt fit on it well. If necessary, even a
round belt can be used.
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hjLv
Photo 4
Fasten the bobbin winder to the table with its driving pulley for enough
from the machine belt so that it will not touch the belt when the winder
is disengaged. Awindshield mounted on the winder base prevents the
thread from being dragged over toward the belt by the suction. An adiust-
oble leather pad mounted on the base serves to stop the winder silently.
Pass the thread from the spool 1through eyelet 2, clockwise around and
between the tension discs 3, to the bobbin. Now pass the end of the thread
inside-out through the slot in the face of the bobbin, place the latter on
the bobbin winder spindle 5, and hold the loose end of thread until the
winder has made a few revolutions. Start the winder by pressing down the
flap of engaging lever 6. When sufficient thread has been wound on the
bobbin, the wincier will stop automatically. The amount of thread to be
wound on the bobbin is regulated by screw 7.
Turning it right—More thread
Turning it left —Less thread
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6. Threading ihe Bobbin Case
Insert the full bobbin into the bobbin case cover so that the thread un
winds clockwise (Photo 5).
Pull the thread into the slot 1, and draw it under the tension spring into
the delivery
eye 2. Place the bobbin case cover with the bobbin on the
center stud in the bobbin case base so that the bobbin case latch points
toward the operator. Press the bobbin case in until it clicks in position
audibly. This is very innportant
as otherwise needle or bobbin case breakage
may result.
Photo 5
7. Threading fhe Needle
Threading the PFAFF 436 presents no difficulty since the thread, as with
PFAFF 133/134 machines, passes in plain view of the operator (Photo 6) so
that every user should be familiar with it. Pass the thread from the thread
unwinder to thread guide pin 1 and, to prevent vibration of the thread at
high speed, through both of its holes. By the same token, pass it through
all three holes in fhe thread retainer 2 as shown in photo 6, and then be
tween tension discs 3, to threod check spring 4, below guide 5, through
guide 6, right-left through the take-up eyelet 7, down to thread guide 8 and
needle bar eyelet 9, and left-right through the needle eye 10.
8. Drawing Up the Bobbin Thread
Hold the end of the needle thread, and turn the balance wheel toward
you until the needle moves down and up again, thus catching the bobbin
thread which comes up through the needle hole in a loop (Photo 7). Place
both threads back under the presser foot.
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Photo 6
Basic Rule: Stop the machine or commence sewing only with the take-up
in its highest position.
This precaution should always be taken to prevent jamming of the thread
in the hook race, or slipping out of the needle eye. In this case it is no't
necessary to hold the needle and bobbin threads when commencing to sew.
9. Regulating the Thread Tensions
To obtain a perfect seam, observe the following points:
The needle and bobbin threads should be locked in fhe center of the
material as shown in Fig. 8.
Turning the tension nut M clockwise makes the needle thread tension
tighter; turning it counter-clockwise will make it looser (Photo 6).
8
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