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Pfaff
Sewing Machine
491
Pfaff 491 User Manual
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Adjustment
11 - 31
11.
04.27
Thread check spring
Requirement
1.
The movement of thread check spring
5
must be completed when the needle point
enters the material ( spring stroke approx.
7 mm
).
7 mm
1
Fig. 11 - 27
●
Position rest
1
(screw
2
) according to
requirement 1
.
●
To adjust the spring tension, turn screw
3
(screw
4
).
For technical sewing reasons it may be necessary to deviate from the indicated
spring stroke or spring tension.
3
5
4
2
68
70
Table of Contents
Instruction Manual
1
Table of Contents
3
Safety
6
Directives
6
General Notes on Safety
6
Safety Symbols
7
Important Points for the User
7
Operating and Specialist Personnel
8
Operating Personnel
8
Specialist Personnel
8
Danger
9
Proper Use
10
Specifications
11
Pfaff 471, 474, 491
12
Needles and Threads
12
Possible Models and Subclasses
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
On/Off Switch on Machines with Mini-Stop Motor
16
Without Edge Trimmer -725
16
And Edge Trimmer -725
16
Button on Machine Head (Only on Machines with -911
17
Pedal
17
Lever for Lifting Roller Presser
18
Knee Lever
18
Key for Setting Stitch Length
19
Swing out Roller Presser
19
Edge Trimmer -725/04 for 471
20
Edge Trimmer -725/04 for 474 and 491
21
Edge Trimmer -726/05 for 491
22
Installation and Commissioning
23
Installation
23
Adjusting the Table Height
23
Fitting the Tilt Lock
24
Tensioning the V-Belt (Does Not Apply to Machines with Mini-Stop Motor)
24
Fitting the V-Belt Guard
25
Fitting the Bottom V-Belt Guard (Does Not Apply to Machines with Mini-Stop Motor)
25
Fitting the Synchronizer
26
Fitting the Reel Stand
26
Switching the Machine On/Off
27
Commissioning
27
Setting up
28
Inserting the Needle on Model 471 and 491
28
Inserting the Needle on Model 474
29
Winding the Bobbin Thread; Adjusting the Primary Thread Tension
30
Removing/Inserting the Bobbin Case
31
Threading the Bobbin Case/Adjusting the Bobbin Thread Tension
31
Threading the Needle Thread and Regulating Its Tension on Model 471/491
32
Threading the Needle Thread and Regulating Its Tension on Model 474
32
Setting the Stitch Length
34
Care and Maintenance
35
Cleaning
35
Oiling the Hook
36
Filling the Oil Reservoir of the Thread Lubrication Unit
36
Lubricating the Bevel Gears
37
Checking/Adjusting the Air Pressure
38
Cleaning the Air Filter of the Air-Filter/Lubricator
38
Adjustment
39
Notes on Adjustment
39
Tools, Gauges and Other Accessories
39
Abbreviations
39
Adjusting the Basic Machine
40
Adjusting the Synchronizer
40
Needle Position in Sewing Direction on the PFAFF 471 and 491
41
Needle Position in Sewing Direction on the PFAFF 474
42
Preliminary Adjustment of the Needle Height
43
Needle Rise, Hook Clearance, Needle Height and Needle Guard on the PFAFF 471
44
Needle Rise, Hook Clearance, Needle Height and Needle Guard on the PFAFF 474
46
Needle Rise, Hook Clearance, Needle Height and Needle Guard on the PFAFF 491
48
Needle Position Crosswise to Sewing Direction on the PFAFF 471
50
Needle Position Crosswise to Sewing Direction on the PFAFF 474
51
Needle Position Crosswise to Sewing Direction on the PFAFF 491
52
Height of the Bobbin-Case Opener
53
Bobbin-Case Opener Stroke
54
Height of the Feed Wheel on the PFAFF 471
55
Height of the Feed Wheel on the PFAFF 474
55
Height of the Feed Wheel on the PFAFF 491
56
Stitch Length Control Eccentric
58
Stitch Length Scale Disk
59
Shaft Crank to Feed Wheel Drive
60
Shaft Crank to Roller Presser Drive
61
Clearance between Roller Presser and Feed Wheel
62
Roller Presser
63
Stitch Length on Stitch Length Scale
64
Synchronization of Roller Presser and Feed Wheel
65
Retainer (Only on Model 474)
66
Knee Lever
67
Needle Thread Tension Release
68
Thread Check Spring
69
Bobbin Winder
70
Pressure of Roller Presser
71
Re-Engage Safety Coupling
72
Adjusting the Edge Trimmer -725/04
73
Knife Stroke on Model 471
75
Knife Stroke on Models 474 and 491
76
Cutting Stroke on Model 471
77
Cutting Stroke on Models 474 and 491
78
Knife Position
79
Adjusting the Thread Trimmer -726/05 on Model 491
80
Position of the Knife to the Needle Plate
80
Knife Position Crosswise to Sewing Direciton
81
Knife Height
82
Cutting Stroke
83
Knife Stroke
84
Adjusting the Thread Trimmer -900/53
85
Removing the Cutter
85
Control Cam with Respect to Bobbin Opener and Tripping Lever
86
Radial Position of the Tripping Lever
87
Engaging Solenoid
88
Cutter Drive Lever
89
Control Cams for Bobbin Opener and Cutter (Using Adjustment Gauge)
90
Radial Position of the Control Cam in Relation to the Bobbin Opener
91
Control Cam for Cutter (Adjustment Without Gauge)
92
Cutter Control Lever for the Control Cam of the Cutter
93
Cutter Return Lever
94
Cutter Return Control
95
Fitting the Cutter
96
Eccentric Sleeve
97
Cutter Driving Rod
98
Cutter Function Test
99
Tension Release (Only on Machines with Thread Tension Control -906/10)
101
Adjustment of Backtacking Mechanism -911
102
Needle in Needle Hole (Only for PFAFF 471 and 491)
102
Coupling for Roller Presser Drive
103
Bevel Gears for Feed Wheel Drive (on the PFAFF 471 and 474)
104
Bevel Gear Play (on the PFAFF 471 and 474)
105
Bevel Gears for Feed Wheel Drive (on the PFAFF 491)
106
Bevel Gear Play (on the PFAFF 491)
107
Parameter Settings for the Quick-Ministop Motor
108
5
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Pfaff 491 Specifications
General
Brand
Pfaff
Model
491
Category
Sewing Machine
Language
English
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