Corner Sewing Method (T-8450B, 8750B); To Stop The Needle Bars (Right And Left); Number Of Stitches: Quick-Reference Guide - Brother T-8420B Instruction Manual
Twin needle lock stitcher, twin needle split needle bar lock stitcher, twin needle lock stitcher with large hook, twin needle split needle bar lock stitcher with large hook
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5-8. Corner sewing method (T-8450B, 8750B)
NOTE:
If using this machine in place of a single-needle machine, remove the needle which is not being used. In such cases, do not
use the procedures given below to stop the unused needle bar from moving, otherwise damage to the machine may result.
5-8-1. To stop the needle bars (right and left)
Push
5-8-2. Number of stitches: quick-reference guide
Sewing angle 40°
No. of stitches 6
<For 1/4" needle width>
Determine the stitch length from the chart above to make beautiful corner stitching.
The number of stitches of the outer needle varies according to the combination of sewing angle and stitch length.
[Example]
For a sewing angle of 40° and a stitch length of 2.9 mm, the number of stitches becomes 6.
Needle
stop
3131M
Sewing
30°
angle
No. of
Stitches
2
3
4
5
4.8
6
4.0
7
3.7
8
3.0
T-8420B, 8450B, 8720B, 8750B
Operate the stop lever after the needle has penetrated the
material and has stopped moving.
Do not sew at speeds of over 1,000 rpm while one of the
needle bars has been stopped.
<To stop operation of the left needle bar>
Move the stop lever (1) to the "L" position.
3128M
<To stop operation of the right needle bar>
Move the stop lever (1) to the "R" position.
Needle
stop
3129M
<To resume twin-needle sewing>
Press the push lever (2).
The stop lever (1) will then return to its original position
automatically.
3130M
40°
50°
60°
70°
4.6
4.6
3.5
3.0
4.4
3.4
2.8
2.3
3.5
2.7
2.2
1.8
2.9
2.3
1.9
1.5
2.5
2.0
1.6
2.2
1.7
5. PREPARATION BEFORE SEWING
80°
90°
100°
110°
120°
3.8
3.2
2.7
2.2
2.5
2.1
1.8
1.5
1.9
1.6
1.3
1.5
1.3
1.3
130°
140°
1.8
1.5
1.1
1.2
22
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