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T-8421B
Brother T-8421B User Manual
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T
-8421B
TWIN NEEDLE DIRECT
DRIVE LOCK STITCHER
T
-8422B
TWIN NEEDLE DIRECT
DRIVE LOCK STITCHER
WITH THREAD TRIMMER
T
-8452B
TWIN NEEDLE DIRECT
DRIVE SPLIT
NEEDLE BAR
LOCK STITCHER WITH
THREAD
TRIMMER
T
-8722B
TWIN NEEDLE DIRECT
DRIVE LOCK STITCHER
WITH LARGE HOOK
AND
THREAD
TRIMMER
T
-8752B
TWIN NEEDLE DIRECT
DRIVE SPLIT
NEEDLE BAR
LOCK STITCHER WITH LARGE HOOK
AND THREAD TRIMMER
2
Table of Contents
Default Chapter
3
Safety Instructions
3
Table of Contents
7
1 Machine Specifications
8
2 Names of Major Parts
10
3 Installation
11
Installation
12
Table Processing Diagram
12
Power Switch
13
Machine Head
14
Operation Panel
14
Cotton Stand
14
Lubrication
16
Connecting the Cords
18
Opening the Control Box Cover
18
Other Cords
20
Test Operation (Operating the Treadle)
22
4 Preparation before Sewing
23
Installing the Needle
23
Removing the Bobbin
24
Winding the Lower Thread
25
Installing the Bobbin
26
Threading the Upper Thread
28
Adjusting the Stitch Length
30
Using the Knee Lifter
30
Using the Thread Wiper (Models with Thread Trimmer Only)
30
Corner Sewing Method (T-8452B, 8752B)
31
To Stop the Needle Bars (Right and Left)
31
Number of Stitches: Quick-Reference Guide
31
5 Using the Operation Panel (Basic Operations)
32
Names and Functions
32
Sewing Start and End Backtack Stitches
34
Sewing Fixed Stitches
35
Using the Lower Thread Counter
36
6 Using the Operation Panel (Advanced Operations)
37
Names and Functions
37
Adjusting the Needle up Stop Position
38
LOCK Key
38
Resetting All Settings to Their Defaults
38
7 Sewing
39
Backtacking
40
Sewing Condensed Stitches
41
8 Thread Tension
42
Adjusting the Thread Tension
42
Adjusting the Presser Foot Pressure
43
Adjusting the Presser Foot Floating Amount (Minute Lifting Amount)
44
Adjusting the Trailing Length after Thread Trimming (Models with Thread Trimmer Only)
44
Adjusting the Thread Take-Up Amount
45
9 Cleaning
46
Daily Cleaning Procedures
46
Lubricating Via the Oil Cover (Every 6 Months)
47
Draining Lubricating Oil
47
Applying Grease - When "GREASEUP" Appears (Semi Dry Specifications)
48
To Continue Sewing Temporarily Without Applying Grease
48
10 Adjusting the Rotary Hook Lubrication Amount
51
11 Troubleshooting
52
Sewing
52
Error Code Displays
57
Instruction Manual
61
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Brother T-8421B Specifications
General
Brand
Brother
Model
T-8421B
Category
Sewing Machine
Language
English
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