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Pfaff
Sewing Machine
939 U
Pfaff 939 U User Manual
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12 - 27
Adjustment
●
Turn torsion spring
1
(screw
2)
in accordance with the
requirement
using nut
3
.
Fig. 12 - 26
12
.05.25
Torsion spring of the differentiation regulating shaft
on the PFAFF 939 U
Requirement
With the presser foot raised, the stitch length set at
"0"
, adjustment wheel
4
at
+ 4.5
and
adjustment wheel
5
at "
0
", guide pin
6
must be touching in connecting link
7
.
4
5
3
2
1
6
7
78
80
Table of Contents
Instruction Manual
1
Table of Contents
3
Contents
4
Safety
7
Regulations
7
General Notes on Safety
7
Safety Symbols
8
Important Notes for the User
8
Notes for Operating and Technical Staff
9
Operating Staff
9
Technical Staff
9
Danger
10
Proper Use
11
Specifications
12
Disposal of Machine
13
Transportation, Packing and Storage
14
Transportation to Customer's Premises
14
Transportation Inside the Customer's Premises
14
Disposal of Packing Materials
14
Storage
14
Explanation of Symbols
15
Controls
16
Main Switch
16
Keys on the Machine Head (Only on Machines with Quick-Flange Motor)
16
Pedal on the PFAFF 939 U
17
Pedal on the PFAFF 3704-2
17
Lever for Raising Presser Foot
18
Knee Lever (Only on the PFAFF 939 U)
18
Adjustment Lever for Zigzag Stitch and Needle Position
19
Reverse-Feed Key
19
Stitch Length Adjustment Wheel
20
Adjustment Wheels for the Top Feed (Only on the PFAFF 939 U)
20
Adjustment Lever for the Differential Feed (Only on the PFAFF 3704-2
21
Adjustment Wheel for Multi-Stitch and Zigzag Stitch (Only on the PFAFF 939 U)
21
Mechanical Edge Guide (Only on the PFAFF 3704-2/02)
22
Knee Switch (Only on the PFAFF 3704-2
22
Control Panel (Only on Machines with Quick-Eco-Drive Motor)
23
Screen Displays
23
Function Keys
23
Installation and Commissioning
25
Installation
25
Adjusting the Table Height
25
Fitting the Top Belt Guard (Only on the PFAFF 939 U)
26
Fitting the Reel Stand
26
Fitting the Quick-Flange Motor (Only on the PFAFF 939 U)
27
Fit the Belt Guard of the Quick Flange-Motor
27
Table Top Cutout for the PFAFF 939 U
28
Table Top Assembly for the PFAFF 939 U
29
Connecting the Plug-In Connections and Earth Cables
30
Commissioning
31
Switching the Machine On/Off
31
Basic Setting of the Machine Drive Unit
32
(Only on Machines with Quick-Eco-Drive-Motor)
32
Mounting/Connecting the Start Inhibitor (Only on Machines with Quick-Anbaumotor)
34
Setting up
35
Inserting the Needle
35
Winding the Bobbin Thread; Adjusting the Primary Thread Tension
36
Removing/Inserting the Bobbin Case
37
Threading the Bobbin Case, Adjusting the Thread Tension
37
Threading the Needle Thread / Adjusting the Needle Thread Tension
38
On the PFAFF 939 U and PFAFF 3704-2/03
38
On the PFAFF 3704-2/02
39
Setting the Zigzag Stitch and the Stitch Position
40
Adjusting the Stitch Length
40
Adjusting the Differential Feed on the PFAFF 939 U
41
Sewing Without Fullness
41
Ständig Mehrweite Einarbeiten
41
Applying Fullness Intermittently
42
Constantly Stretch the Top Material Ply
42
Adjusting the Differential Feed on the PFAFF 3704-2
43
Adjusting the Multi-Stitch or the Zigzag Stitch (on the PFAFF 939 U with Quick-Flange Motor)
44
Changing from Zigzag Stitch to Multi-Stitch
44
Changing from Multi-Stitch to Zigzag Stitch
44
Entering Start and End Backtacks or Condensed Stitches
45
Sewing (Only on Machines with Quick-Eco-Drive-Motoren)
46
Darning Program
47
Counted Seam
47
Error Messages
48
Example of a Seam on the PFAFF 3704-2/02
48
Care and Maintenance
49
Cleaning
49
Lubricating the Hook
50
Oiling the Zigzag Drive
51
Cleaning the Air Filter of the Air-Filter / Lubricator
52
Checking/Adjusting the Air Pressure
52
Adjustment
53
Notes on Adjustment
53
Tools, Gauges and Other Accessories for Adjusting
53
Abbreviations
53
Check and Adjustment Aid
54
Adjusting the Basic Machine
55
Balancing Weight
55
Centering the Needle in the Needle Hole (in Sewing Direction)
56
Parallel Guiding of the Needle Bar
57
Locking Lever
58
Zero Stitch and Zigzag Stitch Scale
59
Centering the Needle in the Needle Hole (Crosswise to Sewing Direction)
60
Zigzag Stitch Width
61
Multi-Stitch Movement (Only on the PFAFF 939 U)
62
Zigzag Stitch Movement (Only on the PFAFF 3704-2
63
Needle Penetration Symmetry (Only on the PFAFF 3704-2
64
Zigzag Movement (Only on the PFAFF 939 U)
65
Target Positioning Sensor (Only on the PFAFF 939 U)
66
Needle Position Adjustment Lever
67
Adjustment Wheels for Differential Feed (Only on the PFAFF 939 U)
68
Zeroing the Differentiatio (Only on the PFAFF 939 U)
69
Differential Feed Synchronisation (Only on the PFAFF 3704-2
70
Position of the Stitch Length Adjustment Wheel on the PFAFF 939 U
71
Position of the Stitch Length Adjustment Wheel on the PFAFF 3704-2
72
Zeroing the Main Feed (Rear Feed Dog) on the PFAFF 939 U
73
Zeroing the Main Feed (Rear Feed Dog) on the PFAFF 3704-2
74
Zeroing the Differential Feed (Front Feed Dog) on the PFAFF 939 U
75
Zeroing the Differential Feed (Front Feed Dog) on the PFAFF 3704-2
76
Torsion Spring of the Reverse Feed Lever on the PFAFF 939 U
77
Torsion Spring of the Reverse Feed Lever on the PFAFF 3704-2
78
Torsion Spring of the Differentiation Regulating Shaft on the PFAFF 939 U
79
Torsion Spring of the Differentiation Regulating Shaft on the PFAFF 3704-2
80
Feeding Motion of the Main and Differential Feeds
81
Lifting Stroke of the Main and Differential Feed Dogs
82
Height of the Main and Differential Feed Dogs
83
Drive Belt in the Gearbox Housing
84
Hook Bearing Bracket
85
Hook Lubrication
86
Pre-Adjusting the Needle Height
87
Needle Rise, Hook-To-Needle Clearance and Bobbin Case Positioning-Finger
88
Final Adjustment of the Needle Height
89
Bobbin Case Opener Position
90
Bobbin Case Opener Motion
91
Presser Foot to Needle Plate Clearance / Presser Foot Pressure
92
Thread Diverter Pin
93
Limiting the Knee Lever Stroke
94
Knee Lever Play
95
Bobbin Winder
96
Stitch Condensation (Only on the PFAFF 3704-2/02)
97
Switching to Reverse Feed (Only on the PFAFF 3704-2/03)
98
Thread Puller (Only on the PFAFF 3704-2/02)
99
Adjusting the Thread Trimmer -900/24
100
Axial Position of the Control Cam
100
Preliminary Adjustment of the Control Cam
101
Position of the Thread Catcher and Cutting Test
102
Readjustment of the Control Cam
103
Needle Thread Tension Release
104
Parameter Settings
105
Selecting the User Level
105
Example of a Parameter Input
106
Liste der Parameter
107
Explanation of the Error Signals
108
Reset / Cold Start
109
Internet Update of the Machine Software
110
Wearing Parts
111
Circuit Diagrams
114
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Pfaff 939 U Specifications
General
Brand
Pfaff
Model
939 U
Category
Sewing Machine
Language
English
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