TM 10-3530-207-14
4-49. BUTTON SEWING MACHINE MAINTENANCE ADJUSTMENT PROCEDURES - continued.
s.
To adjust the tension of the thread nipper.
NOTE
Decreasing the tension may be required when operating with heavier material.
(1)
The thread nipper (1) should hold the thread tightly while the machine Is in its stopped position.
(2)
Should adjustment be necessary, loosen screw (2) in the collar (3) and move the collar (3)
downward for tighter thread nipping or upward for less thread grip. When the required adjustment
is obtained, securely tighten screw (2).
t.
To adjust the timing of the thread nipper.
(1)
When the machine is in its stopped or locked position, the stud (4) on the underside of the thread
nipper, releasing lever (8), should rest upon the center of the stud (5) on the top surface of the
cam (6).
(2)
To adjust, loosen the nut (7) at the upper side of the thread nipper (1) releasing lever (8). By
means of nut (7), move the stud (4) forward or backward. When correct adjustment is made, securely
tighten the nut (7).
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