Pfaff 433 User manual

PFAFF 433
High Speed Sewer
INSTRUCTION BOOK
G. M. PFAFF AG, Sewing Machine Factory, KAISERSLAUTERN
From the library of: Superior Sewing Machine & Supply LLC

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From the library of: Superior Sewing Machine & Supply LLC

Insfruction Book
PFAFF 433
Single-Needle Flaf-Bed Loclcstifch Sewer
with Automatic Lubrication
From the library of: Superior Sewing Machine & Supply LLC

PFAFF 433
Brief Description of Machine
The PFAFF 433 is o single needle, lockstitch, high speed sewing machine,
organized with link take-up and horizontal rotary hook, which incorporates
many important mechanical improvements while retaining oil worthwhile
features of the service-proven PFAFF 134. Depending on the material to
be sewn, this machine is capable of operating at speeds up to 5,000 s.p.m.
which has made the incorporation of a forced feed lubrication system and
o separate hook oiling system an absolute necessity.
Since all manipulations for threading the machine, regulating the stitch
length, backtacking and the like are the same as with previous models, no
expensive retraining of operators is required.
With its modern and functional design, rugged construction and perfect
performance, the
PFAFF 433 satisfies the greatest demands in the sewing
industry.
Varieiies of the PFAFF 433
The PFAFF 433 is available in the following varieties:
Model
Class of Work
Maximum
Lengfhof Sfitch
(Stitchesp.Inch)
Maximum
Speed (s.p.m.)
Needle
System
Presser Foot
Clearance
ASheer, ight-
weight fabrics
75,000
133 R
BMedium-weight
fabrics
64,700
134R
C
Medium-heavy
fabrics
5V. 4,400
134 R
^/u"
The above varieties differ in the needle bar rise, presser bar lift, maximum
stitch length and take-up motion and are particularly well adapted to the
class of work they are intended to perform.
1. Setting Up the Machine
In most instances the PFAFF 433 is fitted for individual power drive. Head
and power table are packed separately.
The machine is driven by a '/i HP
clutch motor. (Type of current and tension optional to suit local require
ments.)
Power is transmitted from the motor to the sewing machine by means of
a V-belt, wide (DIN 2215).
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For 50-cycle current a 2,800 r.p.m. motor should be used, while a 3,400
r.p.m. motor is appropriate for 60-cycle current.
The motor pulley can be easily exchanged to alter the maximum sewing
speed of the machine.
The below table should be consulted for all data regarding the maximum
number of stitches which can be obtained with motor pulleys of different
diameters.
50 Cycles 60
Cycles
Balance Wheel
dm ^
Diameter of Motor Pulley
dm D Order No.
Stitches
per
Minute
Diameter of Motor Pulley
dm D OrderNo.
Stitches
per
Minute
3"
3'
99089 3,800
3^/s2"
3-/32
' 99086
3,800
2^'/64"
3"
3 "/u"
4'/.4'
99090 4,000
31-/3/'
3"/84
' 99087 4,000
2^-/64"
3"
4"/44" 4^8"
99091 4,2C0
3"/84"
3^V84 '
99088 4,300
2^V64"
3"
4'V3:"
4"/84
' 99092 4,400
3"/84"
3 -/,8
' 99089
4,600
3"
4^V.4"
4"/3=
' 99093 4,700
3'V.6"
4'/64'
99090
4,800
2^V^4"
3"
4"/»" S'/b"
99094
5,000
4"/m"
4^/8-
99091 5,000
dm = effective diameter;
D = total diameter
Unpack the head cautiously in order to avoid damage to the machine.
After taking off the lid of the box, unscrew the wood screws which hold
the cushioned wooden blocks that support the machine head in the box.
Cautiously lift out the head, wipe off the dust and mount it on the rubber
pads on the table. To facilitate the mounting of the V-belt, slip the belt
on the machine pulley, slightly tilt back the machine and pull the belt onto
the motor pulley. Adjusting the V-belt tension is instructed in Section 20.
The machine is dispatched without oil In the reservoirs and must not be
run while in this condition.
2. Filling the Oil Reservoirs
The amount of oil which is needed for the first two fillings comes with the
machine in o can. The oil used in the PFAFF 433 is a spindle oil with o
viscosity of 110S/70»F (US) or 95R/70°F (Br.) which has proved very satis
factory for the lubrication of high speed sewing machines. To fill the main
reservoir take out screw d (Photo 1), fill in about one pint (.5 I) of oil obd
wait a few minutes until it has drained down into the reservoir. Then -check
the oil level gauge to see if the amount of oil filled up is sufficient. The oil
level should be between the "max." and "min." marks when the machine
is inoperative. Never remove the top cover to fill up oil there.
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Experience has shown fhof It is of advantage to lubricate the hook sepero-
tely. The reservoir which supplies oil to the rotary hook is located under
top cover b on the machine arm. (Photo 1).
Photo 1
Take out screw c end fill about 5 cu. In. of oil Into the hook oil reservoir
(Photo 21).
As long as the red tip of the float spindle is visible In oil level tube S
(Photo 21) while the machine is In operation, there Is enough oil in the
reservoir. If, however, the red tip Is flush with the top surface of the oil
sealer nut, oil should be filled up.
mm—V
Photo 2
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3. Testing the Machine
It is recommended to test-run the machine with needle thread and bobbin
case removed. Before you plug the power lead into the electric circuit,
niake sure that the voltage of the circuit is the same as that indicated on
the rating plate of your sewing machine, and ascertain that the machine
pulley will turn toward you. Never must the pulley turn in the opposite
direction as this is bound to cause trouble in the lubrication system.
The direction of rotation of the motor can best be checked before mounting
the belt. If the
belt has been mounted, hold the balance wheel, switch on
the motor and tip on the treodle. From the jerk of the balance wheel you
can tell In which direction it will rotate. If it rotates in the wrong direction,
simply exchange the two wires on the motor terminals.
Start the machine by pressing down the treadle.
Never run Ihe machine unless you have placed a piece of fabric under the
presser foot or raised the presser bar.
For the regulation of the oil flow to the hook see Section 23.
SYSTEM
Photo 3
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4. Taking Out fhe Bobbin Case
Raise fhe take-up lever to its highest position, lift the latch of the bobbin
case with thumb and forefinger of your left hand and pull the bobbin case
out of the machine as shown in photo 3.
As long as you hold the latch open, the bobbin cannot fall out.
5. Winding fhe Bobbin
For this operation the power-driven bobbin winder is used which features
a number of improvements. (Photo 4).
The bobbin winder spindle runs in a sintered steel bushing which makes
lubrication of the winder completely superfluous.
Photo 4
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In order to reduce somewhot the high speed of the machine, the diameter
of the bobbin winder pulley has been Increased to
The V-groove in the rim of the pulley has been designed with an obtuse-
angled profile so that the V-belt will fit into it perfectly and, if necessary,
even oround belt may be used.
The bobbin winder is quietly stopped by means of an adjustable leather
pad.
Awindshield which is mounted on the winder base prevents the thread from
being dragged over toward the belt by air suction.
Fasten the bobbin winder to the table with Its driving pulley far enough
from the machine belt so that it will not touch the belt when the winder
is disengaged.
Pass the thread from spool 1 through thread guide 2, clockwise around and
between tension discs 3, and to the bobbin. Pull the thread through the
slot in the bobbin, from the inside. Place the bobbin on spindle 5 and hold
the end of the thread until the winder has made a few revoilutions. Start
the winder by pressing down engaging lever 6. When sufficient thread has
been wound on the bobbin, the winder will stop automatically. The amount
of thread to be wound on the bobbin is regulated by screw 7.
Turn it to the right
for more thread;
end to the left for less thread.
6. Threading ihe Bobbin Case
Insert a full bobbin into the bobbin case so that the thread draws on the
top from 1he left toward the right, as shown in photo 5.
Photo 5
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Pull the thread into slot 1 end draw it under the tension spring into delivery
eye 2. Place the bobbin case with the bobbin on the center stud in the
bobbin case base and moke sure that the end of the latch points toward
you. Press the bobbin case all the way in until it clicks info position audibly.
This is very important as, otherwise, needle or bobbin case breakage may
result.
7. Threading the Needle
To thread the PFAFF 433 is not difficult at all since the thread passes in
clear
view of the operator, similar to the PFAFF 133 and 134. (Photo 6).
Photo 6
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