Auxiliary Clamp Arm; Adjusting The Cloth Feeding Speed (-52 Specifications) - Brother DH4-B981 Instruction Manual

9. STANDARD ADJUSTMENTS

9-19. Auxiliary clamp arm (-02, -52)

9-20. Adjusting the cloth feeding speed (-52 specifications)

q
Becomes slower
Becomes faster
w
Becomes faster
Becomes
slower
w
Approx.
9.6 mm
64
q
0987Q
0988Q
Maximum height
(approx. 11.6 mm)
q
Approx.
9.1 mm
0989Q
DH4-B981
Trimming of the lower thread and gimp is carried out when
the work clamps rise. The auxiliary clamp arm q en-
dures that the material does not move during thread trim-
ming, in order to maintain a stable thread length after trim-
ming.
Turn the A-side needle valve q or B-side needle valve w
to adjust the cloth feeding speed.
NOTE:
* The cloth feeding speed is adjusted to an appropriate
* speed at the time of shipment from the factory, and should
* not be changed unnecessarily.
At the time of shipment
A-side needle valve ... At a height of approximately 9.6
A-side needle valve ... mm from the surface of the valve
A-side needle valve ... body (turned 6 full rotations from
A-side needle valve ... the maximum height)
B-side needle valve ... At a height of approximately 9.1
B-side needle valve ... mm from the surface of the valve
B-side needle valve ... body (turned 7 full rotations from
B-side needle valve ... the maximum height)