Jack JK-T1790 Manual page 150

4.旋梭压片装置的调整 Adjustment of the bobbin presser unit
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.
5.线张力 Thread tension
缝纫机停止时，拧松螺母○
的距离调整为 8～15mm，然后用止动器螺丝○
○
1
位置，再拧紧螺母○
2
Loosen nut ○ and adjust the position with
2
stopper spring ○
3
front end of machine bed to bobbin presser ○
is 8 to 15 mm when the sewing machine stops. Then
tighten nut ○ .
2
（1）挑线弹簧（直锁眼缝）
Thread take-up spring (purl stitch)
1) 挑线弹簧○ 的挑线量为 8～10mm，始动强度 0.06
1
～ 0.1N 左右较为适当。
The thread take-up amount of thread take-up
spring ○ is 8 to 10 mm, and the appropriate
1
pressure at the start is approximately 0.06 to
0.1N.
2) 改变挑线弹簧的动作量时，请拧松螺丝○
螺丝刀插到线张力杆○
To change the stroke of the thread take-up
spring,loosen screw
screwdriver into the slot of thread tension post
, and turn it.
○
3
3) 改变挑线弹簧的强度时，请在螺丝○
下，把细螺丝刀插到线张力杆○
节。向右转动之后，挑线弹簧的强度变强，向左转
动之后，强度变弱。
To change the pressure of the thread take-up
spring, insert a thin screwdriver into the slot
of thread tension post ○
tightened,and turn it. Turning it clockwise
will increase the pressure of the thread take-up
spring.Turning
decrease the pressure.
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把机台前端和旋梭压脚
2
。
so that the distance from the
的缺口部转动调节。
3
, insert
○
2
拧紧的状态
2
的缺口部转动调
3
while screw ○
3
it counterclockwise
调整
3
1
，把细
2
a thin
is
2
will