Pfaff 441-O User manual

®442-R
441 -O
442-0
Service Manual
Pfaff, D 6750 Kaiserslautern, Postfach 3020/3040, Telex: 045753
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Important note:
ThisServiceManual applies also to the Raff 441-0 and 442-0. Deviations in the illustrations do not
affect the adjustment of the machines. The Sen/ice Manual is based on a two-needle machine.
When adjusting a single-needle machine, simply ignore the adjustment procedure for the left
needle and the left sewing hook. A separate Service Manual is available for adjusting the
Pfaff 441-R (0)-705/03: -755/03.
Tools, gauges and other items required for adjusting Raff machines 442-R, 441-0 and 442-0
1 set of screwdrivers with blades from 2 to 10 mm wide
1 set ofwrenches withopeningsfrom 7 to 14 mm wide
1 set of alien keysfrom 2 to 6 mm
1feed dog gauge, part No. 91-129995-05
1adjusting gauge, part No. 91 -129573-91
1C-clamp, part No. 880137/00
1 metal rule
1wrapper of needles: system 134 (for7 mmfabric clearance)
system 134-35 (for 9 mm fabric clearance)
2strips of white
paper
Sewing thread and testing material
Technical data
Maximumsewing speed: 5000 s.p.m.
Balance wheel: 65 mm eff. dia.
Drive: clutchmotor0,550 kW(% HP)
lever-operated Stop motor0,550 kW(% HP)
electronic-stop-motor 0,550 kW(%HP)
Needle system: 134 (for7 mmfabric clearance)
134-35 (for 9 mm fabric clearance)
Fabric clearance: 7 or 9 mm
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Correct
setting:
Scale ring in reverse-feed control
With the stitch length set at "0", the "0" mark on scale ring 3 should be opposite
mark 4.
1.0.1
1.1 Take the needles out of the needle holder.
1.2 Remove the knee levertogetherwith its coupling sleeve.
1.3 Tum knurled disc 1 as far as it will go in the direction in which the reverse-feed control
starts to move downwards.
1.4 Loosen screw 2 and turn scale ring 3until the "0" mark Is opposite mark 4.
1.5 Inthis position, tighten screw 2.
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Correct
setting:
Zeroing the bottom feed
The feed dog must not move forward when you turn the balance wheel with the
stitch length set at "0".
2.0.1
2.1 Remove the left upper plastic plug on the back of the arm standard.
2.2 Unscrew the gearcase cover on the underside of the machine base (collecting the oil, if
any, in a container).
2.3 Loosen screw 1 of the counter-balance.
2.4 Make sure the stitch length is set at "0", then loosen both clamp screws 2 (Fig. 2.0.1) just
sufficiently to allow crank 3 to be turned on its shaft against resistance.
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2.5 Tofacilitateadjustment,insertascrewdriverinthe slot offeed rock shaftcrank4 (Fig.2.0.2).
2.0.2
2.0.3
2.6 Turn the balance wheel and simultaneously adjust rod 5 (Fig. 2.0.3) connected to
crank 3 (Fig. 2.0.1) until the feed dog (or rather the screwdriver in the feed rock shaft
crank) Is completely motionless.
2.7 Inthis position, tighten both clamp screws 2 securely.
2.8 Leave the screwdriver in the slot of feed rock shaftcrank 4 (Fig. 2.0.2) for the subsequent
adjustments.
2.9 Check this adjustment (see "Correct setting").
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Correct
setting:
3.0.2
Bottom feed driving motion
With the machine set for its longest stitch and the needle bar positioned at bottom
deadcenter, the feed dog should not move when the reverse-feed control is operated.
J
3.0.1
3.1 Loosen both screws 1 (Fig. 3.0.1) Infeed driving eccentric 2 just sufficientlyto allow the
eccentric to be turned on its shaft against resistance.
3.2 Bring the needle bar to bottom dead center.
3.3 Pushthe C-clampontothe needlebar,push itupagainstthe needlebarframeandtighten
its screw.
3.4 Set the machine for its longest stitch.
3.5 Movethe reverse-feed control up and down and simultaneously turn feed driving
eccentric 2 until its notch (see arrow in Fig.3.0.1) is visible and the feed dog (or
rather the screwdriverin feed rock shaft crank3) is completely motionless.
3.6 Inthis position, securelytighten the accessible screw 1.
3.7 Remove the C-clamp from the needle bar.
3.8 Also tighten the second screw 1.
3.9 Pull the screwdriver out of the slot in feed rock shaft crank 3.
3.10 Check this adjustment (see "Correct setting").
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Correct
setting:
Lower needle bar driving crank
With the stitch length set at "0", the flat surface of lower needle bar driving crank 4
should be so positioned that its edge is parallel to the edge of the bedplate.
4.0.1
4.0.2
4.1 Take out screws 1 of clip bracket 2 and remove the bracket.
4.2
Set the machine for its longest stitch.
4.3 Loosen screws 3.
4.4 Set the stitch length at "0".
4.5 Turn lower needle bar driving crank 4 so that the edge of its flat surface is parallel
to the edge of bedplate.
4.6 Inthis position,tighten the accessible screw 3.
4.7 Againset the machineforitslongeststitchand tightenthe second screw3,too.
4.8 Replace bracket2 and tighten screws 1.
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Correct
setting:
5.1
5.2
5.3
5.4
Counter-balance
With the machine set for its longest stitch, counter-balance 2 should move freely
when the reverse-feed control is operated.
5.0.1
Set the machine for its longest stitch.
Makesure screw 1 ofcounter-balance2 is loose (Fig.5.0.1), move the latteras faras it will
go, turning itinthe direction indicated by an arrow.
Turnthe counter-balancebackbyabt.1 mmagain, and inthis position tighten screw1.
Check this adjustment (see "Correct setting").
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Correct
setting:
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
Bottom feed lifting motion
When the needle bar is at bottom dead center, the feed dog should be at its
highest point.
n
W
Set the stitch length at "0".
Loosen clamp screw 1.
Turn out screw 3 incollar 2 by half a turn.
Insert ascrewdriver in the slot of bottom feed lifting crank 4 and bring the needle bar to
bottom dead center.
Push the C-clamponto the needle bar, push itup against the needle bar frame and tighten
its screw.
Turn coiiar 2 on the collar of the lifting eccentric until the feed dog (or screwdriver)
is at bottom dead center.
Inthis position, tighten clamp screw 1.
Remove the C-clampfrom the needle bar and tighten screw 3.
Pull the screwdriver out of the slot of bottom feed lifting crank 4 and check this adjustment
(see "Correct setting").
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Correct
setting:
7.1
7.2
7.3
7.4
7.5
7.6
7.7
Note:
Clearance between presser foot and needle plate
Withpresserbar lifter1 raised, there shouid be a ciearance of7.0 mm (needie system
134) or 9.0 mm (needle system 134-35) between presserfootand needle plate.
7mm(9mm)
f
Take out the two screws of the face cover and remove the latter.
Unscrew the cover on the back of the machine arm.
Raise presser bar lifter1 and screw on the presser foot.
Loosen both screws 2 inthe presser bar collar.
Push the 7-mm (or9-mm)thickpart ofthe gauge under the presserfootso that itsrecess
faces downwards (Fig.7.0.1).
Push the presserfoot downonto the gaugeand adjustItlaterally so that its sides are
parallel to the edges of the needle plate slot.
Inthis position, tighten both screws 2.
Adjust the presser footpressure by turning regulating screw4 (Fig. 9.0.1)inor outwhen
you make asewing test.
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Correct
setting:
Feed dog height
Withthe stitch length set at "0" and the needle bar positioned at bottom dead center,
the feed dog should be centered in its slots and contact the gauge throughout its
entire length (Fig. 8.0.2).
2
8.1 Set the stitch length at "0".
8.2 Bring the needle bar to bottom dead center.
8.3 Loosenclamp screws 1 offeed liftingcrank2 and clamp screws 3 offeed rockshaftcrank4.
8.4
Place the machine feed gauge so under the presser foot that its recess faces downwards
and its front edge is flush with the front edge of the needle plate.
8.5 Lower the presser bar lifterto rest the presser foot on the gauge.
8.6 Center the feed dog in its slots.
8.7 Push the feed bar upwardsuntil the feed dog contacts the gauge, and hold itinthis position.
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8.8 Turn eccentric bushing 5 located under feed rock shaft crank 4 until the feed dog is
in contact with the gauge throughout its entire length (Fig. 8.0.2); the feed dog now
protrudes 1.1 mm from the needle plate surface.
8.9 inthis position, tighten clamp screws 1 and 3, making sure that the feed dog is still centered
in its slots.
8.10 Check this adjustment (see "Correctsetting").
8.11
Raise the presser bar lifter and remove the gauge from under the presser foot.
10
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Correct
setting:
Centering the needles in the needle holes
With the stitch length set at "0", the needles should be centered exactly Inthe re
spective needle holes. (ItIsrecommended to Inserttwonew needles)
9.0.2
9.1 Unscrew the coveron the back of the machine arm near the balancewheel.
9.2 Unscrew the presser footand the threadtensionbase plate.
9.3 Set thestitchlengthat"0", and
bring the needlebartotopdead center.
9.4 inserttwoneedles Into the needleholderso thattheir long groovesfaceeach other(note
the needle system).
9.5 Loosenscrew11ncollar2 onthe needle bar driving shaft which isaccessiblethroughthe
aperture (see arrowin Fig.9.0.1).
9.6 Aiso loosen clamp screw3 inthe needlebar driving crank (Fig. 9.0.3).
11
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9.7 Turn the balance wheel to position the needles above the needle holes.
9.8 Turn the balance wheel while moving the needle bar frame sideways until both
needles are centered in their needle holes both lengthwise and crosswise (Fig. 9.0.2).
9.9 Inthis position, push coilar 2 to the right as far as it wiii go and tighten screw 1.
9.10 Also tighten clamp screw 3, making
sure the needle bar drivingshaft has no end play.
9.11 Check this adjustment (see "Correct setting").
9.0.3
12
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10
Preliminary adjustment of needle bar height
Correct When the needle bar Isat top dead center, there should be a clearance of 17 mm be
setting: tweenneedlepointand needle plateon Model S machines,and a clearanceof22mm
on Model L machines.
Model S = 33 mm needle bar stroke
Model L = 38 mm needle bar stroke
17mm(22mm)
10.0.1
10.0.2
10.1 Bringthe needle bar to top dead center.
10.2 Loosen hexagon screw 1 inthe needle bar connecting stud.
10.3 Adjust the needlebarvertically untilthere is a clearanceof17mmbetweenneedle
point and needle plate on Model S machines, or a ciearance of22mmon Model L
machines. Make sure the needie bar is not turned in the process.
10.4 Inthis position, tighten hexagon screw 1.
13
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11
Correct
setting:
Hook timing, hook-to-needle clearance and needle bar height
Withthe stitch length set at "0" and the needlebar positioned 1.8 mm past bottom dead
center(needle rise position)each hook pointshould be exactly oppositethe centerline
of the respective needle, the lateral clearance between hook point and needle being
0.1 mm. Also, Inthis position, the hook points should be positioned 0.8 mm above the
top edge of the respective needle eye.
\
11.0.1
11.0.2
11.0.3
11.1 Set the stitch length at "0".
11.2 Unscrewthe needle plate and the feed dog.
11.3 Loosen alien screw1, which Isaccessible through the holeinthe bevel gearcase cover,
and alien screw 2 between both bevel gearcases.
11.4 Loosen both screws 3, which areaccessible through the holes inthe bevel gearcases.
14
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11.5 Loosen screws 4 of the bobbin case opener eccentrics.
11.6 Also loosen hexagon screws 5 ofthe hook bearing brackets.
11.7 Bringthe needle bar to bottom dead center.
11.8 Push the 1.8-mm-thick blade of the gauge onto the needle bar immediately below its
lower bearing, push the C-clamp up against the blade and tighten its screw.
11.9 Pull out the gauge and turn the balance wheel in its normal direction until the C-clamp
contacts the needle bar bearing.
11.10 Turn both hooks on their shafts so that their points are opposite the center iine of
the respective needle. Inthis position(needle rise position), the hook points should be
positioned0.8 mmabove the top edge ofthe respective needle eye. Ifnecessary, adjust
the needle bar height.
11.11 Adjust the hook bearing brackets laterally until there is a clearance of 0.1 mm be
tween the hook points and the needles.
11.12 Inthis position, securely tighten hexagon screws 5.
11.13 Adjustthe leftpart ofthe maindriveshaft so that the clutchhas a playof0.5 mm.
11.14 Inthis position, tightenalienscrews 1 and 2, makingsure that the bevelgears are neither
set too close nor have too much play.
11.15 Tightenone each ofscrews 4 ofthe bobbin case opener eccentric.
11.16 Push the bushings up against the bevel gears and tightenbothscrews 3 on each.
11.17 Remove the C-clamp fromthe needle bar.
11.18 Check this adjustment (see "Correct setting").
11.19 Do not tighten the second screws 4
as yet.
Note: In
case the hooks have to be exchanged, make surethe marks on hook bearing and hook
are on the same side (see Fig. 11.0.4)
15
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12
12.1
Correct
setting:
12.0.1
12.1.1
12.1.2
12.1.3
12.1.4
12.1.5
12.1.6
Bobbin case openers
Right bobbin case opener eccentric
When thetake-upleverisat bottom deadcenter,shaft3ofthe right bobbin caseopener
should be exactly atitsrear point ofreversal, asseeninthe direction offeed(see arrow).
a
Screw on the feed dog.
Also screwontheneedle plate, making surethatthelugsof both bobbin case bases enter
the
appropriate slotsonthe underside ofthe needle plate.
Loosen screw 1 in the right bobbin case opener eccentric, which was tightened previously.
Turnthe balancewheelto bring the take-upleverto bottom dead center.
Turn the right bobbin case openereccentric 2onitsshaft until shaft3is exactly at
its rearpointof reversal (see arrow).
Inthis position, tighten screws1 securely.
16
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12.2 Left bobbin case opener eccentric
Correct
setting: When
the take-up lever Isat bottom dead center,shaft6 of the left bobbin case opener
shouldbe exactlyat itsfront pointofreversal, as seen inthe direction offeed (see arrow).
12.2.1 Loosen screw 4 in the left bobbin case opener eccentric, which was tightened previously.
12.2.2 Turn the balance wheel to bring the take-up leverto bottom dead center.
12.2.3 Turn the left bobbin case opener eccentric 5 on its shaft until shaft 6 is exactly at
its front point of reversal (see arrow). Inthis position, tighten screw 4securely.
17
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12.3 Right bobbin case opener
Correct Whenshaft 1ofthe rightbobbin case opener isat itsrear pointofreversal (see arrow),
setting: as seen inthe direction of feed, there should be a clearance of 0.3 to 0.5 mm between
the lugofthe rightbobbin case base and the rear edge ofthe needie plate slot.
12.3.1
12.3.2
12.3.3
12.3.4
12.3.5
12.3.6
12.0.2
12.0.3.
Bring the needle bar to bottom dead center.
Turn the balance wheel inits normal direction until shaft1ofthe right bobbin case opener
is at its rear pointof reversal (see arrow).
Loosenclampscrew2 ofthe connecting crankonthe right shaft1.
Reposition the connecting crank on its shaft so that there is a clearance of 0.3 to
0.5mmbetweenthe lugofthe rightbobbincase base andthe rearedgeofthe needle
plate slot.
In this position, tighten clamp screw 2, making surethatthe connecting crank isnot tilted.
Checkthis adjustment(see "Correct setting").
18
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