Adjustment Of The Feed Dog In Longitudinal Direction; Longitudinal Position Of The Feed Dog - JUKI MF-7523 Instruction Manual

19. Adjustment of the feed dog in longitudinal direction

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

(1) Longitudinal position of the feed dog

0.6±0.2mm
❶
❺
A
❸
1.6±0.2mm
❷
❹
‒ 27 ‒ – 27 – – 27 –
1) Position of the main feed dog
It is the standard that the position where the clearance
from the edge of the slot of the throat plate to the front
face of the main feed dog is 0.6 ± 0.2 mm at the po-
sition where the main feed dog travels to the extreme
front position (operator's side) when feed momentum is
set to 3.6 mm (maximum).
When fixing setscrew ❷ in the main feed lever, adjust
the clearance from the edge of the slot of the throat
plate to the front face of the main feed dog to 0.6 ±
0.2 mm when the feed dog travels to the extreme front
position (operator's side), press the main feed lever to
the rocking bar side, and fix it with setscrew.
When the fixing position of the main feed lever slips
greatly out of position, abnormal noise or abrasion will
be caused.
2) Position of the differential feed dog
It is the standard that the position where the clearance
provided between main feed dog and differential feed
dog is 1.6 ± 0.2 mm when the differential feed ratio is set
to 1 : 1 after adjusting the position of the main feed dog.
When fixing setscrew ❶ in the differential feed lever, set
the differential feed ratio to 1 : 1, adjust the clearance
provided between the main feed dog and the differential
feed dog to 1.6 ± 0.2 mm, press the differential feed
lever to the rocking bar side, and fix it with setscrew.
When the fixing position of the differential feed lever
slips greatly out of position, abnormal noise or abrasion
will be caused.
When the adjustment value changes great-
ly, feed dog or throat plate will be broken.
Remove rubber plugs ❸ and ❹ without
removing cover ❺ . Then, the feed dog
can be adjusted by loosening differential
feed lever setscrew ❶ and main feed lever
setscrew ❷ .
Cover ❺ is applied with sealant. The
sealant has to be removed when removing
cover ❺ . Remove cover ❺ while peeling
off the sealant by tightening an M4 screw
in tapped hole A.