Ss Lever Unit; Installing The Ss Lever Unit; Adjusting The Ss Lever Unit - JUKI MF-7900 Series Engineer's Manual

(7) SS lever unit

WARNING :
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.

1) Installing the SS lever unit

❶
Install SS lever unit ❹ using setscrews 1 ❶ of SS lever unit, setscrews 2 ❷ of SS lever unit and wash-
1.
ers ❸ of SS lever unit supplied as accessories.
* Temporarily tighten setscrews 2 ❷ of SS lever unit at the center position of the elongated hole
and securely tighten setscrews after performing the trial sewing and adjusting the stitch pitch of
the short stitch.
In addition, install the SS cover after finishing the work of securely tightening of setscrews.
Refer to "(7)-2) Adjusting the SS lever unit" for how to adjust and install the SS lever unit.

2) Adjusting the SS lever unit

WARNING :
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. In addition, cut
the air supply from air compressor.
Loosen setscrews ❷ of SS lever ❶ , move the SS lever ❶ up and down to adjust the position, and the
1.
stitch pitch of the short stitch can be adjusted.
* Commendable stitch pitch is 1.4 mm. (The center position of the elongated hole of SS lever ❶ is
the standard.)
Turn SS lever ❶ in the direction A to increase the stitch pitch, and turn it in the direction B to decrease
the stitch pitch.
When the adjustment is completed, install SS cover ❹ using setscrew ❸ supplied as accessories. Set-
2.
screw ❺ has to be tightened together with the pitch scale plate.
❷
B
A
❶
❸
❷
❹
– 163 –
❸
❺
❹