Brother BAS-761 Service Manual download pdf (Page 50)

5. ADJUSTMENT

BAS-7610

5-10

1. Stroke : Adjust → Loosen set-screw (2), Turn the whole unit of the tension regulator assembly

2. Force : Adjust → Insert a screwdriver tip into the groove of tension stud (3), Turn the tension stud

(The tension in the thread take-up spring when it is pulling the upper thread straight to the side at the point where the

spring starts to move.)

In the case of “ X2.4 rotary hook “ specification, the thread guide, R can also adjust thread tightening. (It is because the

width of adjustment of a position is large.)

It will be good tightening if a size A is enlarged.

If a size A is enlarged when using inelastic thread, thread may break.

Reference

T - 105 (twisted) thread : Size A → 12 - 19 mm

Inelastic thread : Size A → 10 mm or less

1338S

(1)

5 - 10 mm

1339S

(2)

X1.7 rotary hook

X2.4 rotary hook

(3)

.4 -

0.4 - 0.6 N

1340S

1341S

1679S

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Brother BAS-761 Service Manual Page 50