Pfaff 469 User manual

m
PFAFF
®
CIfafD
Instruction Book
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(PFAFP f 469
High-Speed Lockstitch
Differential-Feed Sewing Machine
Instruction Book
G-M PFAFFAG KAISERSLAUTERN BRANCH
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Foreword
The scope of this book is confined to such instructions as are conditioned by variations in the
design of the Pfaff 469 high-speed differential-feed sewing machine as compared with other
Pfaff high-speed seamers.
An outstanding feature ofthe Pfaff 469 isthe incorporation df sealed-for-life ball and needle
bearings in the machine arm and the needle head. '
Another salient feature is the arrangement of the feed driving and feed lifting eccentrics on the
bottom rather than the arm shaft. The bottom shaft is driven from the arm shaft by a cleated
belt and drives the hook shaft by means of helical gears. These driving elements are enclosed
in an oiltight gear case and are lubricated by an oil-soaked foam plastic sheet. The assemblies
controlling the differential-feed are disposed on two shafts inside and outside the gear case.
The sewing hook is lubricated by means of a gravity lubrication system incorporating a
centrifugal switch.
Since the armshaft is belted to the motor, the machine c^n be tilted back without remoylng
the V-belt.
Additional features of this new high-speed seamer are a novel stitch length control, separate
forward-reverse feed control, built-in bobbin winder and built-in lifting lever. •
Operators will like the modern functional design and the stream-lined belt guard which is
attached to the machine arm.
G. M. PFAFF AG
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R 8766
1. Setting Up the Machine
Like all the other models in the new range of high-speed seamers, the Pfaff 469 differential-
feed sewing machine can only be set up on a power table fitted with the new rubber hinge
bracket and cushion set
The front corners of the bedplate are face-milled on the underside and rest on matching rubber
cushions which are recessed into the tabletop.
At the back, the new-type hinge studs connect the machine with the pins in the two rubber
hinge brackets. This mounting prevents the machine from coming in contact with the tabletop.
The machine is carefully balanced and causes practically no vibration. Whatever vibration
there Is will be absorbed almost completely by the rubber hinge brackets.
2. Mounting the V-Belt
The machine are shipped with the belt guard removed. To mount the V-belt, lift the sewing
head slightly and place the belt on the machine and motor pulleys.
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Both belt guard sections are secured to the arm standard by inserting screw dthrough hole
b3 and spacing sleeve c in the rear section into screwhole d1 in the machine base and
tightening it securely.
Slightly turn out screws a1 and a2 (Fig. 1) and push the two belt guard sections together,
holding them close to the machine so that the above screws enter the appropriate slots in the
back wall of the belt guard.
To tighten the screws, insert the screwdriver through openings b1 and b2 (Fig. 2).
3. Test-Running the Machine
Before you test-run the machine, carefully remove all dirt which may have accumulated in
transit. Be sure to use only a brush and a cleaning rag for this purpose.
The Pfaff 469 must never be rinsed or cleaned with kerosene'because there is a danger that
the cleaning fluid enters the sealed-for-life bearings and dissolves the grease. For the same
reason, kerosene or gasoline must not be used for the regular cleaning of the machine.
Never attempt to eliminate hard working of the machine by squirting oil freely into the bearings
which you believe to be responsible for this fault. If oil enters the sealed-for-life bearings,
the grease will be thinned and flung
out of the bearing, thus rendering permanent lubrication
ineffective. ;
R
9145
Fig. 1 R
9144
Fig. 2
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4. Winding the Bobbin
The new high-speed seamer is fitted with a bobbin winder which is incorporated in the face
cover rather than mounted at the balance-wheel end of the machine, as was customary
previously (Fig. 5). Arranged at a convenient height, it is easy to operate and enables the
operator to wind bobbins quickly and neatly.
The bobbin winder driving motion emanates from the take-up crank. When the bobbin winder
is engaged, driving crank F at the rear end of spindle 17 is pushed into the circular path of
stud K
which engagesthe crankand,inthis way, drives the bobbin winder (Fig. 3).The bobbin
winder spindle is carried in a self-lubricating sintermetal bearing which requires no additional
lubrication.
To engage the bobbin winder, simply depress stop latch a located above the bobbin winder
spindle (Fig. 4). Thisaction causes the spindle to shift slightly to the right in which position
It is retained until a sufficient amount of thread has been wound on the bobbin. The thread
wound on the bobbin pushes the cam up and thereby stops the bobbin winder. The amount
ofthreadto be woundon the bobbin can be regulated by loosening screw b and setting cam
a higher or lower, as may be required. Set the cam higher for more thread, or lower for less
thread.
R 8643
4
Fig. 3
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Fig, 4 shows how to thread the machine for bobbin winding. Place the spool of thread on the
right-hand spool pin of the thread stand. Lead the thread from spool 1a (Fig. 4) up and
through the top thread guide of the thread stand, down and through thread guides 12, 13
and 14, clockwise around thread tension 15 and to bobbin 16.
it is recommended to take the thread after it has been pulled through thread guide 14 and
wind a few turns on the bobbin, then lead it clockwise around thread tension 15 and place
the bobbin on spindle 17.
Depending on the type of thread used, it should be wound on the bobbin tighter or looser.
The thread tension is regulated by turning thumb nut 18 back of the tension discs (Fig. 4).
Turn this nut clockwise for a looser tension, or counter-clockwise for a tighter tension.
if the thread should pile up at one end of the bobbin, adjust the position of the tension stud.
The set screw which secures this stud in position can be reached from below.
Whenever you have removed an empty bobbin from the machine, wind a few turns of thread
on it, place it on the bobbin winder spindle and start the winder.
It is a waste of time to work with a single bobbin or a single spool of thread because this
requires an additional unthreading and threading of the needle, and you cannot sew while
winding the bobbin.
R 9141
Fig. 4
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5. Threading the Needle
Because of the high speed of this machine, it is particularly importantthat the thread passes
to the needle smoothly.
Lead the thread from spool 1 up to the top thread guide of the thread stand and down to
thread guide 2. it is recommended to pass the thread first through the vertical hole from top
to bottom and then through the transverse hole of the guide, as shown in Figs. 5 and 5a,
in order to prevent it from snarling up on the guide and breaking.
Now lead the thread through all three holes of thread retainer 3 (from top to bottom), clockwise
around and between tension discs 4, through thread check spring 5, under slack thread
regulator 6, through thread guide 7. from right to left through the hole In take-up lever 8.
through thread guides 7, 9 and 10, and from left to right through needle eye 11.
R 9148
Fig. 5a
m
Fig. 5
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6. Regulating the Stitch Length
Two separate controls serve to regulate the length of stitch and reverse the direction of feed.
The large diameter of stitch length control St makes for an exceedingly fine stitch length
regulation. When this control is turned by one tooth, the stitch length is increased or decreased •
by Vss". or
0.5 mm. The stitch lengths from 0 to 5/2 stitches per inch are marked on the teeth
of the stitch length control in millimeters (Fig. 6).
In order to avoid that the stitch length setting will be disturbed while sewing, stitch length
control St is secured in position by a locking lever marked Sp in Fig. 6. This lever must be
pushed back slightly when setting the stitch length.
Finger-tip control Tserves to reverse the direction of feed and is operated for backtacking.
When lever T is pressed down, the machine will sew in reverse, making stitches of the length
set. When lever T is released, the direction of feed is instantly reversed by spring action and
the machine will resume forward stitching.
If desired, the machine can be fitted with a second treadle for switching from forward to
backward sewing. ;
••
7. Regulating the Pressure on the Material ?
A powerful flat spring in the machine arm exerts the necessary pressure onthe sewing fqiSt. ;
The amount of pressure is regulated by turning a small set screw which can be reachecf'by,
inserting a screwdriver through hole 19 on the right of the spool pin (Fig. 6a). Tur^ the
screw in for more pressure, or out for less pressure. -
r - ^
Fig. 6 R
9386 Fig. 6a
R 9147
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8. Lifting the Presser Bar
Since the arm standard has been set closer to the rear edge of the bedplate, the presser bar
lifting mechanism couldbe enclosedinthe machine armso that it isnot visible onthe outside.
To mount the knee lever, push it over the lower end of vertical shaft r under the tabletop.
The lever is held in place by angular bracket s which snaps into place after transverse pin u
has entered cutouts t in right-angled coupling sleeve q (Fig. 7). When the coupling sleeve is
pushed onto the end ofthe shaft, resilient bracket s must be compressed to open it slightly
(see Fig. 7).
Motion istransmitted from the vertical shafttothe presser footby means ofa crank, aconnection
and a bellcrank lever which raises the presser foot. A small hand lever C (Fig. 9) serves to
lock the presser foot inits highest position. This lever is flicked to the left to retain the presser
foot after it has been raised by knee action.
To facilitate tilting the sewing head back without removing the knee lever completely, the
knee lever rock shaftis no longer screwed to the angular sleeve, but rather held in place bya
spring-loaded pin V (Fig. 7). As a result, the knee lever can be pulled forward off its shaft
with ajerk.
A new feature ofthis knee leveris a hinged knee platefitted with a foam plastic pad which is
contoured to hug the operator's knee.
R 9158
Fig. 7
10
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9. Lubrication
Recent advances in the design of needle bearings have made it possible to ensure a satisfactory
permanent lubrication of this machine without the incorporation of an automatic lubrication
system.
Thanks to the incorporation of sealed-for-life bearings, the machine does not have to have
an oiltight base so that various feed mechanisms and special attachments can be easily
installed, a feature which opens up a practically unlimited field of applications to this high
speed sewing machine.
With all essential points of friction having been fitted with saaled-for-life ball and needle
bearings, there is no need to provide a gravity lubrication system, except for the sewing hook.
The oil reservoir of the hook lubrication system is located in the machine arm and supplies oil
to
the sewing hook through a plastic tube. The oil flow is controlled by shut-off valve V which
is opened by centrifugal switch F on the hook shaft when the machine is running, and closed
when it stops, thus preventing any oil leakage (Fig. 10).
The oil level in the reservoir of the hook lubrication system can be inspected through the oil
sight glass. If it is below the mark on the oil sight glass, top up the reservoir by inserting the
spout of an ordinary oil can into the small hole above the oil sight glass. The flow of oil to the
sewing hook, in addition, can be regulated by screw w(Fig. 8) to suit different operational
requirements. Turn this screw in for less oil, or out for more oil.
y.
R 8603
Fig. 8
11
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The correct setting for normal operation can be determined by a simple test, as follows:
Remove needle plate and feed dog and place a sheet of paper over the opening. Then run
the machine for about ten seconds at top speed. The setting is correct if two thin lines of
spray oil appear on the paper.
In contrast to the sealed-for-life ball and needle bearings in the needle head which must
n|ver be oiled, take-up lever link z is lubricated bya wick which is enclosed inan oil tubeand
is soaked with oil from the hook oil reservoir (Fig. 9).
To oil the needle bar bearings, put a few drops of oil into the foam-plastic-lined oil dents x
and y on the upper and lower needle bar bushings (Fig. 9). This should be done rather fre
quently during the first few weeks of operation. Occasionally, also apply some oil to the
presser bar.
12
R 8900
Fig. 9
Pressure on the material is exerted
bv fiat spring B. After the presser
foot has been raised by knee
action, it Is retained in this position
by lever C.
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The feed driving and feed regulating mechanisms as well as the hook shaft driving gears in
the gear case are lubricated by two oil-soaked foam plastic sheets (pad lubrication).
Oil has to be changed only once a year. To do this, tilt the machine back and unscrew the ' > ,
gear case cover. '
If the foam plastic sheets are to be re-used, they should first be washed in gasoline in order,'
to remove the metal grit which has accumulated on them.
In most instances, however, it will be better to replace the old foam plastic sheets by new
ones which may be ordered by Nos. 91-069 299-05 and 91-069302-05. These new sheets
must be well soaked with sewing machine oil (2.7'E/50''C), Order No. 280-1-120110, the
same that is used in the hook lubrication system.
To soak both sheets thoroughly requires about 4 fl. oz., or 130 cu. cm., of oil.
When replacing the foam plastic sheets, make sure they fit properly and the large spur gear
runs freely in the cutout of the large sheet. As you replace the gear case cover, check to see
that the gasket is not defective and make sure you tighten all screws evenly in order to prevent
oil from seeping out.
The oscillating feed rock shaft is grease-lubricated. Qrea^ is replenished through nipple N
at the left end of the shaft (Fig. 10). '
.-'m
Note
When filling the hookoil reservoir or topping Itup,take carethat noair bubbles remain inthe
oil tube
leading to shut-off valve V (Fig. 10) because this would interrupt the flow of oil.
If an air bubble should nevertheless have formed ahead of shut-off valve V, pull the oil tube
offthe shut-offvalve nipple, holditsend upso that the airbubble risesto the surface.Cautiously
replace the oil tube on the nipple, making sure no air is trapped in It.
An air bubble which may have formed Inthe short section of the oiltube is immaterialbecause
it can escape through oil flow regulating valve w (Fig. 10).
13
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R 8767
Fig. 10
The gear case cover and foam-plastic sheet P are removed. To absorb dripping oil, place a collucotton pad under
the machine. Bottom drive shaft A carries both feed driving eccentrics
SI and S2 and hook shaft drivinggear T
in the gear case, and feed lifting eccentrics H1 and H2 as well as bobbin case opener eccentric K near its left end.
The hook shaft carries centrifugal switch F whose stud pushes the valve stem to the right when the machine is in
operation, thereby opening hook lubrication shut-off valve V. When in its inoperative position, the valve stem
should be positioned '/i'". or 1.5 mm. from the stud. The valve prevents the oil fromseeping out when the machine
is not in operation.
The stitch length setting of the front feed dog is transmitted to shaft L, the left crank mechanism in the gear case,
the inner feed rock shaft, and the left adjustable crank which, in turn, transmits it to the left feed bar.
The stroke of the back feed dog Is varied by means of two large thumb screws, a and b, on shaft IVI and lever c
which connects with the treadle chain. This lever varies the stroke of the right feed bar by means of the right crank
mechanism in the gear case.
14
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R 8412
Fig. 11
The clearance between both feed dogs is smallest when the differential feed is disengaged or when both feed
dogs are at the beginning or endtdf t^eir strokes Instretching and gathering, respectiveiy. •
10. Differential Feed
In order to produce durable seams or preventseam puckering, the sewing industryfrequently
employs machinesfitted with differential feed which can be set to gather or stretch the fabric
while sewing.
To this end, the Pfaff 469 is equipped with two feed dogs arranged in tandem. For ordinary
sewing, both feed dogs are set so that their length oftravelis the same. Ifthey are set to move
differentially, the machine gathers or stretches,
The Pfaff 469 is set for ordinary sewing, gathering or stretching by turning the two large
thumb screws a and b below the bedplate (Fig. 10).
11. Setting the Machine for Ordinary Sewing
Toset both feed dogs so that their length of travelis the same, turn in thumb screws a and b
as faras they will go. Set the stitch length control on "0" and checkto see that crankc, which
connects with the treadle pitman, is in its horizontal position. To double-check this setting,
watch the feed motion and check whether both feed dogs rise and fall exactly perpendicularly.
Ifadjustment is required, turn both thumb screws in or out, as may be required.
The machine can now be set for any desired stitch length without disturbing the relative
positions of the feed dogs.
12. Setting the Machine for Gathering
To produce a gathering effect, the stroke ofthe front feed dog must be longer thanthe stroke
of the rearfeed dog. This is accomplishedbyturning out thumb screw a (Fig. 10).
Thedifferential feed motionis controlled by asmalltreadle.The harderthis treadle isdepressed,
the longer the stroke ofthe front feed dog will be and the more the fabric will be gathered.
15
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For gathering, the stitches must not be set too long because the stroke of the front feed dog
is dependent on the stitch length set, I.e. the amount of gathering decreases as the stitch
Igngth increases. How far thumb screw a has to be turned out for the amount of gathering
desired can be easily determined by a few test runs.
Each thumb screw hastwo flat spots on its threaded stud which are engaged by a spring.
Thjs spring secures the screw in position and prevents it from turning as a result of machine
vibration. In addition, this spring makes it easier to cound the number of turns when turning
tbe screw in or out for adjustment.
Whenthe smalltreadle is released, both feed dogs again move forward in unison. As a result,
the machine ceasesgathering and resumes ordinary sewing, making stitchesof the lengthset.
Ifthe machine is to be used for continuous gathering, its setting can be fixed by turning in
thumbscrewb (Fig. 10) as faras it will go.This eliminates the necessity of keeping the small
treadle depressed all the time.
13. Setting thd Machine for Stretching
To convert the Pfaff:469 frofn.'gathering to stretching, or vice versa, requires no exchanging
pr interchanging of fee(;|dbgs„^ -
•^egin by turning thumb sci^w a in as far as it will go so that both feed dogs move forward
in unison and their Ipngth of travel corresponds to the stitch length set.
For stretching, the stroke of the front feed dog must be shorter than the stroke of the rear feed
dog so that the former retains the material slightly while the latter advances it in accordance
with the stitch length set. The amount of stretching is regulated by turning thumb screw b out,
as appropriate. To establish the correct relationship between both feeding motions requires
but little practice.
Fig. 12
R 8411
Theclearance betweenboth feeddogs is largestwhenboth feed dogs are at the beginning or end of theirstrokes
in gathering and stretching, respectively.
16
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Fig. 13
Tv^' 6.-
R 8770 A
f -. :vy - .-^'. k f:
When setting the machine for stretching, care must be taken that thumb screw b is not turned
out beyond the point at which the front feed dog begins to feed in reverse.
Setting the machine for a longer stitch will automatically increase the amount of stretchih||.
The maximum amount of stretching will be obtained by setting the rear feed dog for its longest
forward stroke and turning
out thumb nut b to set the front feed dog for its maximum backward
stroke.
When the machine is set for stretching, depressing the small treadle will decrease the amount
of stretching and switch the machine to ordinary sewing. The operator can thus reduce the
amount of stretching, as desired, or eliminate stretching altogether.
14. Setting the Machine for Alternate Gathering and Stretching
Afterturning thumb screws a and b out as far as they willgo, practised operators will be able
to stretch and gather the fabric alternately while sewing.
Ifyou start sewing with this setting and without actuating the small treadle, the fabric will
be stretched more or less, depending on the stitch length set. The more you depress the
treadle, the more the amount of stretching will be reduced until the machine changes over to
ordinary sewing and then to gathering. The maximum amount of gathering is obtained when
the treadle is pressed down as far as it will go.
Changing over from gathering to stretching and vice versa by simply pressing the treadle down
more or less requires a great deal of skill on the part of the operator. Most operators will
therefore preferto set the desired amount of gathering or stretching by turning the regulating
screws In or out, as may be required.
17
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Ascale and a pointerare providedon the armstandard as a visual aid insetting the differential
feed. Pointer Zindicates the amount of gathering orstretching on the scale. Thegraduations
from 0 to + indicate the amount of gathering, while the graduations between 0 and —indicate
the amount of stretching. The graduation marks on the scale enable the operator to restore
any desired setting without having to sew a trial seam first (Fig. 13).
15. Varieties
To suit different operational requirements, the Pfaff 469 can be easily converted into the
following varieties by exchanging its organizational parts.
Model
Needle Max.
' Machine
Motor Pulley Needle Needle
Hole Stitch
Speed Size
System
Dia.
Length, in r.p.m. ^Dia•*
Order No. in
in
mm
in s.p'.m. in mm V100 mm
•A (1.0) 1.0
-:-5q00 . 11.8-• 16-4371^0-55 60
134
•A 1.2
7^'" -:5606
118
16-437.120-55 70 134
•A (1.4) 1.4
5000 118 16-437120-55
80 134
B
1.6 514
4800 112 16-437110-55 90-100
134
B (1.8)
1.8 514 4800 112
16-437110-55 100-110 134
C (2.0)
2.0
514 4300 100 16-437090-55
120 134
C 2.2
514
4300 100 16-437090-55 140 134
*) If desired, fitted with Needle System 133.
**) Primarily intended for stretching.
•*•) dm = mean diameter.
16. The Pfaff 469-431
Atrimming machine organized with differential feed, the Pfaff 469-431 occupies a prominent
position among the subclasses of the Pfaff 469.
The vertical trimmer is arranged to the right of the needle and produces a clean cut, regardless
whether the machine is set for ordinary sewing, gathering or stretching.
The knife driving mechanism is arranged at the back of the machine arm. The knife driving
motion emanates from an eccentric on the arm shaft and is transmitted to the knife holder
bracket via a connection, an oscillating frame, a crank and a ball-joint connection. The knife
holder bracket moves up and down on a post.
Thanks to its favorable kinematical design and its pad and reservoir lubrication, the trimming
mechanism is capable of paring the edge of the fabric while the machine operates at top speed.
The trimmer is engaged and disengaged by operating a lever which is arranged within easy
reach of the operator and protrudes from under the machine arm. When this lever is actuated,
its rear end, via a link, rotates the knife engaging shaft. A cam secured on this shaft operates
a locking latch which keeps the knife engaging lever engaged in either one of two notches
in the engaging shaft flange.
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The trimming margin, i.e. the distance from the trimmed edge to the line of stitching, is pre
determined and can only be changed by replacing the needle plate insert.
Setting the knife higher or lower is accomplished by shortening or lengthening the drive
connection. The setting is correct ifthe upper end of the cutting edge is about Vaa",or 1.0 mm,
below the cutting edge of the stationary knife when the top knife is at the lowest point of
its stroke.
Attached to the knife holder by means of a shim prevfeusly, the knife is now secured In place
by adjustable jaws, but must still be pushed up as far as it will go.
The knife holder can be adjusted lengthyvise and crosswise.
The only time the knife holder has to be adjusted is after the needle plate insert has been
exchanged to obtain adifferent trimming margin.
To do this, engage the trimming mechanism and rotate the balance wheel until the knife is at
the lowest point of its stroke. Loosen the two set screws on the front of the knife holder and
adjust the latter so that the knife contacts'the stationary knife on the needle plate insert.
Tighten both screws securely. Makesure the knifeis set,correctiy lengthwise. Its lengthwise
setting is correct if it is centered in the needle plate cutout. To adjust,'loosen the screw on the
right-hand side of the knife holderand move the knife forward or backward, as may be required.
After the adjustment, tighten this screw securely.
Needle plate inserts are available for trimming margins ranging from about Vaa" to '/si"
(2.5-7.0 mm) in steps of about or 0.5 mm. On special request, subclass -431/2 and
-431/4 machines can be supplied for trimming margins ranging from about to 'Vaa"
(8.0-12.0 mm) in steps of about or 1.0 mm.
Upper and lower knives (the latter incorporated in the needle
plate insert) are available in the following varieties:
Subclass-431/1 Tool-steel top knife and tool-steel needle
plate insert with cutting edge
Subclass -431 /2 Tool-steel top knife and carbide-edged needle
plate insert
Subclass -431 /3 Carbide-edged top knife and tool-steel needle
plate insert with cutting edge
Subclass -431/4 Carbide-edged top knife and carbide-edged
needle plate insert
Unless specified otherwise on the order, subclass -431 machines will be supplied in version /4
fitted with a carbide-edged top knife and needle plate insert. This version is rated very highly
because both the top knife and the needle plate insert retain an exceptionally keen cutting
edge even when put to hard use. In this case. Model A and Bmachines will be fitted for a
trimming margin of Ve". or 3.0 mm, and Model C machines for ®/32", or 4.0 mm, these margins
being the most customary.
19
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Fig. 14
Fig. 16
fijpOOS Fig..l,^,
Employed for the simuliahgoLs stitchinji-„^'d fining ' Stitching and Irimrnmg the front edge of a sackcoal
of collars and cuffs previdti^io :ti^frt|^^er?ldoally^.^ previoH^.to lurning over. The edge tape Is attached
suited for the production of ^{(c^i^lg^de,''e(c. V..' simultart^usfy. v-
R 8999 Fig. 17
R 8973
R 9043
The knife actuating lever has a handy plate which Knife drivingmechanism of the Pfaff469.431, as seen
protrudes from under the machine arm. from the rear (cover removed).
20
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