HIGHLEAD GC1998-MCDZ, Инструкция по эксплуатации

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14) Adjustment of forward/backward stitch length
(1) Loosen screw
①
on the right of the adjustment arm.
(2) Turn the eccentric shaft
②
and adjust.
(3) The forward stitch length will increase and the backward
length will decrease when the eccentric shaft
②
is turned
counterclockwise.
(4) The forward stitch length will decrease and the backward
length will increase when the eccentric shaft
②
is turned
clockwise.
15) Adjustment of knife engagement
a. Position of fixed knife
(1) As a standard, the dimension between the fixed
knife's end and the needle center is 2.5mm.
(2) The standard relation of the knife (left) and fixed
knife is shown in the figure. As a standard, Di-
mension A is 0.3mm.
(3) When Dimension A is too large, the three piece
of threads will be cut, and can cause the needle
thread to come out from needle after trimming. If
too small, the thread may not be trimmed cor-
rectly.
(4) Adjust by adjusting the installation of the fixed
knife.
b. Knife engagement amount
(1) When the sewing machine is rotated while the
solenoid is activated, the knife (left) will be rotated by
the thread trimming cam.
As a standard, the knife engagement amount should be
1.5 to 2.0mm when the knife (left) moves the most.
(2)Adjust by adjusting the installation of the drive arm.
c. Adjustment of knife engagement pressure
(1)As a standard, the knife (left) and fixed knife should
start contacting at the position shown in the figure.
2) To adjust the engagement pressure, loosen the lock nut
②
and then adjust the adjustment screw
①
.