Pfaff Industrial 3819 Guide

This adjustment manual applies to machines from
the following serial numbers onwards:
# 2 808 742
3819
296-12-19 291/002
Adjustment manual engl. 11.15
ADJUSTMENT MANUAL
-20/02
-40/01

Reprinting, reproduction and/or translation of PFAFF instruction manuals
(including parts thereof) is only permitted with our prior agreement and
citation of the source.
PFAFF Industriesysteme
und Maschinen GmbH
Hans-Geiger-Str. 12 - IG Nord
D-67661 Kaiserslautern

Table of Contents
Contents ..................................................................................................Page
13 Adjustment ........................................................................................................................... 4
13.01 Notes on adjustment ............................................................................................................. 4
13.02 Tools, gauges and other accessories .................................................................................... 4
13.03 Abbreviations ......................................................................................................................... 4
13.04 Explanation of symbols.......................................................................................................... 4
13.05 Adjusting basic machine ........................................................................................................ 5
13.05.01 Needle height (pre-calibrating) ............................................................................................... 5
13.05.02 Hook driving eccentric (pre-calibrating).................................................................................. 6
13.05.03 Feed lifting eccentric ............................................................................................................. 7
13.05.04 Spreader driving eccentric ..................................................................................................... 8
13.05.05 Feed driving eccentric and drive to needle bar frame............................................................ 9
13.05.06 Feed dog position ................................................................................................................ 10
13.05.07 Feed dog height................................................................................................................... 11
13.05.08 Needle position to needle hole ............................................................................................ 12
13.05.09 Hook position crossways to sewing direction ..................................................................... 13
13.05.10 Hook position to sewing direction / readjusting hook eccentric .......................................... 14
13.05.11 Readjusting needle height ................................................................................................... 15
13.05.12 Spreader position in sewing direction.................................................................................. 16
13.05.13 Spreader position crossways to sewing direction ............................................................... 17
13.05.14 Needle guard and thread-loop support ................................................................................ 18
13.05.15 Compensation weight.......................................................................................................... 19
13.05.16 Feed difference.................................................................................................................... 20
13.05.17 Clearance between presser foot and needle plate .............................................................. 21
13.05.18 Needle thread regulation and take-up lever guard ............................................................... 22
13.05.19 Looper thread regulation...................................................................................................... 23
13.05.20 Stitch length limitation ......................................................................................................... 24
13.05.21 Puller: roller clearance setting ............................................................................................. 25
13.05.22 Pressure tank ...................................................................................................................... 26
13.05.23 Cutting unit ......................................................................................................................... 27
13.05.24 Skip stitch system .............................................................................................................. 28
13.05.25 Pleating attachment ............................................................................................................ 29
14 Circuit Diagrams ................................................................................................................ 30
14.01 Circuit diagrams ................................................................................................................... 30

Adjustment
4
13 Adjustment
Observe and comply with all instructions in the operating manual's chapter 1
Safety! In particular make sure that all safety covers are installed again correct-
ly after making adjustments, see chapter 1.06 Operating manual hazard infor-
mation!
Unless otherwise stated, the machine must be disconnected from the power
supply before all adjustment work!
Risk of injury due to accidental machine start-up!
13.01 Notes on adjustment
All adjustments in this manual are based on a fully assembled machine and may only be
carried out by technical staff trained for this purpose. Machine covers, which have to be
removed and replaced to carry out checks and adjustments, are not mentioned in the text.
The order of the following chapters corresponds to the most logical work sequence for
machines that have to be completely adjusted. Both the preceding and following chapters
must be observed if only specific individual work steps are carried out. Screws and nuts
indicated in brackets () are fastenings for machine parts, which must be loosened before any
adjustment and tightened again afterwards.
13.02 Tools, gauges and other accessories
1set of screwdrivers with knife widths of 2 to 10 mm
1set of wrenches with jaw widths from 6to 22 mm
1set of Allen keys of 1.5to 6mm
1metal ruler (order no. 08-880 218-00
Needle rise gauge (order no. 61-111 600-01)
Screw clamp (order no. 61-111 600-35)
Adjustment pin (order no. 61-111 643-55)
Needles, system (62-57)
Thread and testing material
13.03 Abbreviations
t.d.c. = top dead centre
b.d.c. = bottom dead centre
13.04 Explanation of symbols
Activities to be performed or important information in this adjustment manual are empha-
sised by symbols. The symbols used have the following meaning:
Note, information
Maintenance, repairs, adjustment, service work
(only to be carried out by technical staff)

Adjustment
5
13.05 Adjusting basic machine
13.05.01 Needle height (pre-calibrating)
Rule
When the needle bar is at t.d.c., the clearance between the needle point and
needle plate should be approx. 12 mm with a needle bar stroke of 36 mm.
Adjust the needle bar 1(screw 2) without twisting according to the rule.
Fig. 13 - 01
12 mm
2
1

Adjustment
6
13.05.02 Hook driving eccentric (pre-calibrating)
Insert the adjustment pin 1in the hole 2.
Turn the eccentric 3(screws 4) according to the rule.
Remove the adjustment pin 1.
Rule
When the needle bar is in b.d.c., the round side of the adjustment pin 1
(order no. 61-111 643-55) should engage in the groove 5.
Fig. 13 - 02
1
3
2
3
4
5

Adjustment
7
13.05.03 Feed lifting eccentric
Rule
When the needle bar is in b.d.c., the groove 3should be positioned vertically above the
shaft 4.
Turn the eccentric 1(screws 2) according to the rule.
Fig. 13 - 03
12
4
3

Adjustment
8
13.05.04 Spreader driving eccentric
Rule
1. When the needle bar is in b.d.c., the groove 5of the eccentric 1should be
positioned vertically above the shaft 3.
2. The spreader holder 4should move 6mm.
Turn the eccentric 1(screws 2) according to rule 1or adjust (axially) according to rule 2.
Fig. 13 - 04
1
2
3
5
3
6 mm
4

Adjustment
9
13.05.05 Feed driving eccentric and drive to needle bar frame
Rule
When the needle bar is in b.d.c.,
1. the groove 7of the eccentric 1should be positioned vertically above the shaft 5and
2. the crank 3should be positioned vertically to the shaft 6
Turn the eccentric 1(screws 2) according to rule 1.
Turn the crank 3(screw 4) according to rule 2.
Fig. 13 - 05
3
6
4
2
7
5
1

Adjustment
10
13.05.06 Feed dog position
Rule
The feed dog 4should move laterally and longitudinally in the centre of the needle plate
recess at maximum stitch length.
Align the attachment 1(screws 2and 3) according to the rule.
Fig. 13 - 06
1
2
3
4
=
=

Adjustment
11
13.05.07 Feed dog height
Rule
When the needle bar is in b.d.c. and with maximum stitch length regulation, the front
teeth of the feed dog 3 should be positioned 1.1 mm above the needle plate.
Loosen the screw 1 .
Adjust the feed bar 2according to the rule.
Tighten the screw 1.
Loosen the nut 4 on the stop screw 5.
Screw in the stop screw 5 up to the stop and secure it with the nut 4.
Fig. 13 - 07
3
2
1
5
4
1.1 mm
3

Adjustment
12
Fig. 13 - 08
13.05.08 Needle position to needle hole
Rule
1. The needle should pierce the middle of the needle hole crossways to the sewing
direction.
2. When the needle bar is in b.d.c., there should be a clearance of 0.8mm between
the needle and the front edge of the needle hole.
Align the needle bar frame (screws 1, 2and 3) according to rule 1.
Adjust the needle bar (screw 3) according to rule 2.
2
0.8 mm
1
3

Adjustment
13
Fig. 13- 09
13.05.09 Hook position crossways to sewing direction
Rule
The hooks 1should be parallel to the needle plate recess
1. if the hook points are at the needle midpoint,
2. there should be a clearance of 0.1mm between the hook point and the needle.
Set the hook point at the needle midpoint by turning the handwheel.
Align the hook 1(screws 2) according to rule 1.
Adjust the bracket 3(screws 4) according to rule 2.
1
4
3
1
0.1 mm
2

Adjustment
14
Fig. 13 - 10
13.05.10 Hook position to sewing direction / readjusting hook eccentric
Rule
When the needle bar is positioned 6.0mm after b.d.c. and stitch length regulation is
6.0mm, the hook point should be at the needle midpoint.
Setting the maximum stitch length
Move the needle bar to a position 6.0mm after b.d.c. by turning the handwheel.
Secure the c-clamp to the needle bar in this position so that the upward movement of
the needle bar is blocked.
Adjust the bracket 1(screw 2) according to the rule.
Checking the hook driving eccentric
Turn the handwheel against the direction of rotation until the c-clamp lays flat again.
Measure the clearance between the hook point and the edge of the needle - the clear-
ance should be 5mm.
In the event that this differs, turn the handwheel in the direction of rotation until the c-
clamp lays flat again and make the following adjustment:
Measured value is larger than 5mm, turn the eccentric 3(screw 4) so that the hook
moves to the left by half the value of the measured difference.
Measured value is smaller than 5mm, turn the eccentric 3(screw 4) so that the hook
moves to the right by half the value of the measured difference.
Restore the setting indicated in the rule after a correction has been made to the eccen-
tric 3.
Maintain stitch length regulation for the next setting.
1
2
4
3

Adjustment
15
Fig. 13- 11
13.05.11 Readjusting needle height
Rule
If the hook point aligns with the front of the needle at maximum stitch length coming
from behind, the lower edge of the hook should be positioned 1.5– 2mm above the
needle eye.
Adjust the needle bar 1( screw 2) according to the rule.
Check the hook position the sewing direction, see chapter 1.05.10 Hook position in sew-
ing direction.
1
2
1.5 - 2 mm

Adjustment
16
Fig. 13 - 12
13.05.12 Spreader position in sewing direction
Rule
1. The spreader tip should be inclined approx. 45° downwards and be 11 mm away
from the spreader holder.
2. The clearance between the tip of spreader 1and the needle should be 4mm with
maximum stitch length regulation and the needle bar positioned in b.d.c.
Adjust the spreader 1(screws 2) according to rule 1.
Adjust the bracket 3(screw 4) according to rule 2.
3
1
1
2
2
4
1
45°
4 mm
11 mm
1

Adjustment
17
Fig. 13 - 13
13.05.13 Spreader position crossways to sewing direction
Rule
1. The tips of the spreader 1 should be 0.1 mm away from the hook at the side.
2. The tips of the spreader 1should be positioned 0.1mm above the back of the hook.
Place the hook eye next to the tips of the spreader 1by turning the handwheel.
Adjust the bracket 2(screws 3) according to rule 1.
Turn the handwheel until the tips of the spreader 1are positioned above the back of the
hook.
Adjust the bracket 2(screw 4) according to rule 2.
2
1
0.1 mm
4
3
0.1 mm
1
0.1 mm

Adjustment
18
13 - 14
13.05.14 Needle guard and thread-loop support
Rule
If the hook point is positioned at the needle midpoint coming from behind, the
1. guard 1should rest gently on the needle and the lower edge of it should be posi-
tioned 0.5mm above the needle point.
Align the guard 1(screws 2) according to rule 1.
0.5 mm
2
1

Adjustment
19
Fig. 13- 15
13.05.15 Compensation weight
Rule
When the needle bar is in t.d.c., the largest eccentricity of the compensation weight 1
should be in the bottom position.
Turn the compensation weight 1(screw 2) according to the rule.
2
1
1
2

Adjustment
20
13.05.16 Feed difference
Rule
The needle and bottom transporter should feed in the same way with maximum stitch
length regulation and when turning the handwheel.
Adjust the connecting rod 1(nut 2) according to the rule.
Connecting rod by " +" = larger needle feed or
by "
-" = smaller needle feed.
Fig. 13 - 16
2
1
1
+-