Adjusting The Feed Locus; Changing The Feed Driving Movement - JUKI MF-7523 Instruction Manual

17. Adjusting the feed locus

WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the follow-
ing work after turning the power off and ascertaining that the motor is at rest.

(1) Changing the feed driving movement

❶
❺
❸
❻
❸
B
❸
C
D
❹
❼
❽
❷
A
❻
❼
❽
❸
‒ 23 ‒ – 23 – – 23 –
Timing of the feed driving eccentric cam can be retarded
from the standard adjustment by 10°.
1) Remove cloth plate, left ❶ and rubber plugs ❷ .
2) Insert a hexagonal wrench key into the hole from which
the rubber plug is removed to loosen two setscrews ❺
and ❻ of positioning cam ❸ and setscrews ❼ and ❽
of feed driving eccentric cam ❹ .
3) Move positioning cam ❸ to the left. Disengage the
convex section from the 1st concave section. Then,
engage the convex section A with the 2nd concave
section B.
4) Fix positioning cam ❸ on flat section C with positioning
cam setscrew No. 2 ❻ , while lightly pressing the cam
to the right.
5) Check to be sure that feed driving eccentric cam ❹ is
movable. Then, tighten setscrew No. 1 ❺ .
6) Fix feed driving eccentric cam ❹ with eccentric cam
setscrews No. 1 ❼ and No. 2 ❽ , while pressing the
cam in the opposite direction to its normal movement.
Check to be sure that the "positioning cam
❸
is in contact with the feed driving eccen-
❹
tric cam" (section D) so as to prevent
the setscrews from loosening.