Adjustment Of Threads Tension Release Assembly; Adjustment Of Scissoring Pressure Of Movable Knife And Fixed Knife; A, Arm Bed Mechanism - HIGHLEAD GC20638-25 Instruction Manual

the thread trimmer cam so that the movable knife starts moving when the green mark point on the
balance wheel comes in line with the black mark point on the arm.
Note: To adjust, Loosen two thread trimmer cam clamp screws A.
24) Adjustment of needle threads tension release assembly (Fig.34)
A Turn the balance wheel by hand until the needles reach the lowest position.
B
Maintaining the needle position, depress the cam follower crank and put the cam roller into the groove
of thread trimmer cam.
C Turning the balance wheel by hand, adjust the thread tension release cam so that the tension disc close
when the white mark point on the balance wheel comes in line with the black mark point on the arm.
D
To adjust, loosen two tension release cam clamp screws
A.
E
Opening degree of tension disc should be adjusted with the tension release roller
B
mounted on the
convex portion of thread release cam, as shown in Fig. To adjust, loosen the screws C and draw the
wire.
F Make fine adjustment by loosening the nut
D.
G Loosen the nut D and make the outer casing approach rightward to increase the opening value.
White park point
I
Thread trimmer
cam
ScrewC
Cam follower
~Jut
D
Arm
""-...
25) Adjustment of scissoring pressure of movable knife and
fixed V~rtife (Fig.35)
i\ Loosen the fixed knife bracket clamp bolt/\.
B
Turn the vertical position adjusting
set"C\\
l3 to adjust meshing
pressure and then righter the hexagon socket head cap scre'vv
i\.
Note:
Since excess pressure causes large torque to the thread
trim·11ing mechanism and trimming fitilurc.
:tdju~t
it so
II
point
I_
Fig.34
Fig.35