Jack JK-T1790 Manual page 148

2.上线切线的调整 Adjusting the needle thread trimmer
警告
WARNING:
为了防止突然起动造成人身事故，请关掉电源，确认马达确实停止转动后再进行操作。
To protect against possible personal injury due to abrupt start of the machine, be sure to start
the following work after turning the power off and ascertaining that the motor is at rest.
（3）内旋梭的固定调整
Adjusting the bobbin case positioning stopper
用固定螺丝○ 把内旋梭固定器○
3
的端面的咬合调整为 0～0.2mm。
Adjust with setscrew○
top end of bobbin case positioning stopper ○
and the end of inner hook ○
（1）上线切刀的切线力的调整
Adjusting the thread grasping force of the
needle thread trimmer
上线切刀切线力不稳定的话，始缝时上线容易跳线。
If the needle thread trimmer fails to provide
consistent thread grasping force, the needle
thread can slip off at the beginning of sewing.
1) 上线切线力弱时，拧松螺丝○
If the thread grasping force of the needle
thread trimmer has reduced, loosen setscrews
and detach needle thread trimmer ○
○
1
2) 用手把压线弹簧前端轻轻弄弯，把压线弹簧○
上切刀○ 的接触间隙调整为没有间隙。
4
Slightly bend the top end of thread presser
spring ○ so that it comes in contact with
3
thread trimming blade of upper knife ○
the length with no clearance and so that the
needle thread trimmer securely holds the thread
regardless of the position of the thread
trimming blade at which the thread is trimmed.
- 141 -
的前端和内旋梭○
1
so that the contact of the
3
is 0 to 0.2 mm.
2
，卸下上线切刀○
1
.
2
4
2
1
。
2
和
3
over