Replacing And Adjusting The Upper Movable Knife - Brother RH-9820 Service Manual

7-23. Adjusting the lower thread feeding amount <-01 specifications only>
It is necessary for enough tension to be applied to the lower thread during the time from when the upper thread is picked up by
the eye looper at the first stitch until spreader L finishes opening, without the lower thread being pulled out by the thread nipper,
so that the first stitch can be sewn correctly at the sewing start.
Becomes less

7-24. Replacing and adjusting the upper movable knife

7-24-1. Replacing the upper movable knife
<-00 and –01 specifications>
<-00 and -01 specifications>
0399B
Becomes more
<-02 specifications>
<-02 specifications>
0401B
1. After automatic sewing is finished, switch to manual mode
and then press the start switch. (Refer to "7-6. Manual
sewing (manual mode)" in the instruction manual.)
2. Turn the upper shaft pulley and check the condition of the
lower thread.
<If adjustment is necessary>
3. Turn off the power, and then tilt back the machine head.
4. Loosen the two screws (1), and then move lower thread
guide C (2) in the direction of the arrow to adjust.
* If it is moved to the right, the lower thread feeding
amount will increase, and if it is moved to the left, the
amount will decrease.
5. Once adjustment is complete, securely tighten the two
screws (1).
1. Remove the screw (1), and then remove the upper
movable knife (2).
2. Install the new upper movable knife with the screw (1).
RH-9820
7. ADJUSTMENTS
166