20
Caution
▶
After disassembling and adjusting a safety device, always place it back to the original position
and check whether it functions as intended.
▶
Use both hands when pushing the machine backward or returning it to the original position.
Due to the weight of the machine, your hand can get stuck in the machine if you should slip.
▶
When adjusting the machine with the switch on, be sure to pay extreme caution.
▶
Only trained engineers must perform troubleshooting or inspection of the machine.
▶
For electrical repair or inspection, consult with qualified technicians or agent.
9) Height and Tension Adjustment of Presser Foot
(1) As in Fig. 29, remove the rubber plug
②
in the face plate
and place the presser foot
③
on the needle plate. Then,
loosen the presser bar fixing screw
④
and adjust the
height of the presser bar. The presser foot
③
will fall
when the presser bar is lifted and rise when the presser
bar is moved down. Move the presser foot lifter
⑤
manually to place the bottom face of the presser foot
5.5mm above the top face of the needle plate and tighten
the presser bar fixing screws firmly.
(2) Tension adjustment
As described in Fig. 29, the tension of the presser foot
will grow stronger when the tension adjusting screw
⑥
is
turned clockwise and weaker when turned
counterclockwise. Make sure to screw in the fixing nut
①
after adjustment.
10) Adjustment of Automatic Knee-Lifter (Optional)
An automatic knee-lifter will be attached to the sewing machine at point of delivery. The lifting amount of the presser foot
when automatically lifting the knee is controlled by the automatic knee-lifting solenoid shaft crank
①
. First, loosen the
solenoid cover fixing screw
③
and remove the solenoid cover
②
. If the solenoid shaft
⑤
is moved left and the fixing screw
④
is tightened when the solenoid crank shaft fixing screw
④
is loose, the lifting amount of the presser foot grows smaller. If the
solenoid shaft
⑤
is moved to the right, the lifting amount will grow bigger. Assemble the cover back after the adjustment is
completed. (The presser foot lifting amount for the automatic knee-lifter will be set to 13mm by default at point of delivery.)
[Fig. 29]
[Fig. 30]
Top Face of the Needle Plate
Weaker
Stronger
Keystone Sewing Machine Company, Inc.
