Pfaff Industrial POWERline 3741 Guide

This instruction manual applies to
machines from software version 1.2 and
serial number 2 763 625 onwards
Justieranleitung engl. 09.10
ADJUSTMENT MANUAL
3741
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The reprinting, copying or translation of PFAFF Service 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
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Index
Contents ................................................................................ Page
1Adjustment ........................................................................................................................... 4
1.01 Notes on adjustment ............................................................................................................. 4
1.02 Tools, gauges and other accessories for adjusting ............................................................... 4
1.03 Abbreviations ......................................................................................................................... 4
1.04 Explanation of the symbols....................................................................................................4
1.05 Adjusting the basic machine .................................................................................................. 5
1.05.01 Basic position of the balance wheel (adjustment aid)............................................................ 5
1.05.02 Zero position of the bottom and needle feed ........................................................................ 6
1.05.03 Feed dog motion of bottom feed dog and needle feed .........................................................7
1.05.04 Feeding motion of the bottom feed dog ................................................................................ 8
1.05.05 Height of the bottom feed dog .............................................................................................. 9
1.05.06 Feeding stroke difference .................................................................................................... 10
1.05.07 Preliminary adjustment of the needle height....................................................................... 11
1.05.08 Needle rise, hook clearance, needle height and bobbin case position finger ...................... 12
1.05.09 Bobbin case opener ............................................................................................................. 13
1.05.10 Bobbin winder...................................................................................................................... 14
1.05.11 Thread check spring and thread regulator............................................................................ 15
1.05.12 Sewing foot pressure........................................................................................................... 16
1.05.13 Lubrication ........................................................................................................................... 17
1.05.14 Reengaging the slip clutch................................................................................................... 18
1.06 Adjusting the thread trimmer -900/81.................................................................................. 19
1.06.01 Resting position of the roller lever / radial position of the control cam................................ 19
1.06.02 Position and height of the thread catcher ............................................................................ 20
1.06.03 Knife pressure...................................................................................................................... 21
1.06.04 Bobbin thread clamp spring ................................................................................................. 22
1.06.05 Manual cutting test .............................................................................................................. 23
1.07 Setup.................................................................................................................................... 24
1.07.01 Set reference position.......................................................................................................... 24
1.07.02 Stitch length adjustment...................................................................................................... 25
1.07.03 Commissioning the scanner ................................................................................................ 26
1.08 Parameter settings............................................................................................................... 27
1.08.01 Selecting and altering the parameters ................................................................................. 27
1.08.02 Parameter list....................................................................................................................... 28
1.09 Description of the error messages ...................................................................................... 37
1.10 Inputs / Outputs................................................................................................................... 38
1.11 Pin assignment .................................................................................................................... 39
1.12 Importend Sevice-information............................................................................................. 42
2Pneumatics-switch diagram PFAFF 3741 + 3745.............................................................. 43
3Circuit diagrams................................................................................................................. 44
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Adjustment
4
1 Adjustment
Please observe all notes from Chapter 1Safety of the instruction manual!
In particular care must be taken to see that all protective devices are refitted
properly after adjustment, see Chapter 1.06 Danger warnings of the instruc-
tion 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!
1.01 Notes on adjustment
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 adjust-
ments, 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 specific 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.
1.02 Tools, gauges and other accessories for adjusting
Screwdrivers with blade width from●2to 10 mm
Spanners (wrenches) with jaw width from●7to 14 mm
1●set Allen keys from 1.5to 6mm
Metal rule (part No.●08-880 218-00)
Sewing thread and test materials●
1.03 Abbreviations
t.d.c. = top dead centre
b.d.c. = bottom dead centre
1.04 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 qualified staff only)
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Adjustment
5
Fig. 1 - 01
1
2
2
127-01
1.05 Adjusting the basic machine
1.05.01 Basic position of the balance wheel (adjustment aid)
Requirement
When the needle bar is positioned at t.d.c., the marking "0" on the scale should be level
with the top edge of the belt guard (see arrow).
Adjust the scale dial●1(four screws 2) in accordance with the requirement.
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Adjustment
6
Fig. 1 - 02
1.05.02 Zero position of the bottom and needle feed
Requirement
At stitch length setting "0"
turning the handwheel, the bottom transporter and the needle bar should not move, and1.
the bolt of lever2. 7should be set to the middle position of recess 8.
A gap of3. 0.3 mm should exist between initiator 5and switching plate 4.
Turn machine on, stitch platen motor moves to reference position.●
Turn shaft●1of the stitch platen (screws 2and 3) in accordance with requirement 1.
Move switching plate●4in accordance with rule 3and tighten screws 2.
Set bolt●6of lever 7to the middle of recess 8, and tighten screws 3.
Check rule settings and adjust where required.●
1
3
4
2
0,3 mm
5
41
5
X
=
X
67
8
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Adjustment
7
Fig. 1 - 03
1.05.03 Feed dog motion of bottom feed dog and needle feed
Requirement
Bottom transporters, as well as the needle bar should not move, when stitch
platen 3is activated with handwheel at 190° or higher.
Adjust eccentric●1(screws 2) in accordance with the requirement. Make sure that the
cut-out (see arrow) is visible.
1
2
3
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Adjustment
8
Fig. 1 - 04
1.05.04 Feeding motion of the bottom feed dog
Requirement
When the balance wheel is positioned at 180°, the feed dog should be at t.d.c.
Adjust eccentric●1(screws 2) in accordance with the requirement.
1
2
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Adjustment
9
Turn lifting crank●1(screws 2) in accordance with requirement 1.
Adjust eccentric sleeve●3and feed bar 5(screws 4) in accordance with requirement 2
The height of the bottom feed dog can be increased or reduced by moving
crank 6(nut 7) up or down.
Fig. 1 - 05
0,5 mm
12
3
4
5
2
4
127-091
7
6
1.05.05 Height of the bottom feed dog
Requirement
When the needle bar is positioned at b.d.c. (balance wheel position1. 180°), the bottom
feed dog should be positioned 0.5mm horizontally above the top edge of the needle
plate, when crank 6is in the centre of the slot.
The bottom feed dog should be positioned in the centre of the needle plate slot.2.
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Adjustment
10
12
Fig. 1 - 06
1.05.06 Feeding stroke difference
Requirement
With the maximum stitch length set, when the balance wheel is turned the feeding
strokes of the needle and the bottom feed dog should be the same.
With connecting rod●1(nut 2) increase ("+") or reduce (-) the needle feed stroke in
accordance with the requirement.
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Adjustment
11
Without turning it, re-position needle bar●1(screw 2) in accordance with the requirement.
1.05.07 Preliminary adjustment of the needle height
Requirement
When the needle bar is positioned at t.d.c. (balance wheel position 0°), the clearance be-
tween the needle point and the needle plate should be 22 mm.
Fig. 1 - 07
1
2
22 mm
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Adjustment
12
Fig. 1 - 08
1.05.08 Needle rise, hook clearance, needle height and bobbin case position finger
Requirement
For stitch length setting "4.0" and needle bar position 2.0 mm to u.T.
( = handwheel position 202°):
The hook point should be positioned at needle centre with a needle cut clearance of1.
0.05 – 0.10 mm.
The top of the needle eye should be positioned2. 0.8mm below hook point 6.
Needle guard3. 7should slightly touch the needle.
Loosen both screws of the gear drive of hook●1(under cover 2).
Adjust hook●1and hook bearing 3(screws 4and 5) in accordance with requirement 1.
Without turning it, re-position the needle bar in accordance with the requirement●2, also
see Chapter 1.05.08 Preliminary adjustment of the needle height.
Adjust needle guard●7(screw 8) in accordance with requirement 3.
Set a low cog clearance for screw●9.
If the needle size is changed, a quick adjustment of hook bearing 3is possible,
after loosening screws 4and 5.
0,8 mm
6
5
5
6
8
2
4
3
1
9
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Adjustment
13
1.05.09 Bobbin case opener
Requirement
When turning the handwheel, the horn1. 4should be lifted off the stitch platen 5on the
right turning point of the bobbin lift 1by the thread thickness.
Bobbin lift upper edge, and lower bobbin upper edge should be at same level.2.
Bobbin lift3. 1should be in the right turning point at handwheel position "300°".
Screw4. 7to the return spring of the bobbin lift should be positioned approx. 10 mm above
the lock nut 8.
Bobbin lift●1( screw 2) must be turned and moved according to requirements 1 and 2.
Excenter ( screw under cover●3) must be turned in accordance with requirement 3.
Adjust screw●7(nut 8) in accordance with requirement 4.
The thread must be able to pass unhindered between bobbin case opener 1
and bobbin case 6
Fig. 1 - 09
4
5
1
6
2
+
-
3
10 mm
8
7
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Adjustment
14
Fig. 1 - 10
1.05.10 Bobbin winder
Requirement
When the bobbin winder is engaged, the winding spindle must be driven reliably.1.
When it is disengaged, friction wheel 3should not be touching drive wheel 1.
When it is switched off, the bobbin winder must click securely into its end position2.
(knife raised).
Adjust drive wheel●1(screw 2) in accordance with the requirement.
2
1
3
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Adjustment
15
1.05.11 Thread check spring and thread regulator
Requirement
The movement of thread regulator1. 3must be completed when the needle point enters
the material (spring stroke approx. 7mm).
When the thread loop is at its largest while being passed around the hook, the check2.
thread spring 3should rise slightly from the rest 1.
Position rest●1(screw 2) in accordance with requirement 1.
Turn sleeve●4(screw 2) to adjust the tension of thread check spring 3.
Position thread regulator●5(screw 6) in accordance with requirement 2.
For technical reasons it may be necessary to deviate from the indicated spring
stroke or spring tension.
Move thread regulator 5(screw 6) towards ("+") (= more thread) or ("-")
(= less thread)
Fig. 1 - 11
2
4
5
6
3
7 mm
1
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Adjustment
16
Fig. 1 - 12
1.05.12 Sewing foot pressure
Requirement
The material should be fed properly even at maximum speed and with the smallest stroke.
Turn adjustment wheel●1in accordance with the requirement.
1
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Adjustment
17
1.05.13 Lubrication
Requirement
After 10 seconds operation at 800 rpm, a light oil strip should appear on a paper strip held
to the clamp foot.
Check that the machine is filled with oil and that the oil lines are free of air.●
Run the machine for●2– 3min.
Do not put your hands into the needle area when the machine is running!
Danger of injury from moving parts!
With the machine running, hold the paper strip against the hook and check the require-●
ment.
If necessary, regulate amount of oil with screw●1
127-093
Fig. 1 - 13
1
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Adjustment
18
Fig. 1 - 14
127-095
1
1.05.14 Reengaging the slip clutch
Clutch 1is pre-set by the manufacturer. If the thread jams, clutch 1disengages
in order to avoid damage to the hooks.
Below is a description of how to engage clutch 1.
Eliminate the jammed thread.●
Brace clutch●1as shown in Fig. 1-18, and turn the balance wheel until you feel clutch 1
engage again.
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Adjustment
19
1.06 Adjusting the thread trimmer -900/81
1.06.01 Resting position of the roller lever / radial position of the control cam
Requirement
When the take-up lever is at t.d.c. (balance wheel position1. 60 °), control cam 1should
just have moved roller lever 5into its basic position.
When the thread trimmer is in its resting position, there should be a clearance of2.
0.1mm between roller lever 5and control cam 1.
Adjust control cam●1(screws 2) in accordance with requirement 1.
Adjust screw●3(nut 4) in accordance with requirement 2
Fig. 1 - 15
1
2
3
4
5
0,1 mm
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Adjustment
20
Press roller lever●1against control cam 2.
Adjust thread catcher●3(screw 4) in accordance with the requirement
The height of thread catcher 3is pre-set by the manufacturer and, if necessary,
it can be adjusted with washers under thread catcher 3on the base of the hook
bearing.
Fig. 1 - 16
2
4
1
127-096
3
5
1.06.02 Position and height of the thread catcher
Requirement
When the needle bar is positioned at b.d.c. (balance wheel position 180°) the edges of
thread catcher 3and knife 5should be flush (see arrow).
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