5-24.Button Clamp Opener (B917A); 5-25.Thread Take-Up Lever; 5-26.Main Tension - Brother CB3-B917 Service Manual

Chainstitch button sewer
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5-24.Button clamp opener (B917A)

Button clamp
lifter lever
Adjustment plate
Button clamp
opener claw B
Button clamp
opener claw B

5-25.Thread take-up lever

518s
Cotton thread

5-26.Main tension

Decrease
Main tension
control nut
Roller
Contact
51702s
Button clamp open lever
Button clamp open
lever
0 – 1 mm
517s
Thread take-up lever
Less
More
Synthetic thread
Increase
519s
1. When the pulley is turned and, at the final stitch, the Button
clamp lifter lever and the roller contact, adjust the
adjustment plate so that the button clamp opener claw B
contacts the button clamp open lever at the same time.
2. In the above condition, adjust the button clamp opener
claw B so that the clearance of the button clamp opener
claw B and of the button clamp open lever is 0 – 1 mm.
Adjust the thread take-up lever position according to the
thread used.
Cotton thread
With the machine in the stop position, set the bottom of the
thread take-up lever to the top reference line.
Synthetic thread
With the machine in the stop position, set the bottom of the
thread take-up lever to the bottom reference line.
Turn the main tension control nut to adjust the thread tension.
B916A
If, after attaching the button, long threads remain hanging
from the back side of the material, adjust the main tension
for stronger tension.
CB3-B916A/B917A
5. ADJUSTMENT
40

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