Adjustment Of Feed Dog Height And Longitudinal Movement (Mechanism With Differential Feed) - JUKI MS-3580 Serie Manual De Instrucciones

8. Adjustment of feed dog height and longitudinal movement
(mechanism with differential feed)
WARNING :
Perform the work after turning OFF the power to prevent accidents caused by the abrupt start of the
sewing machine.
(1) Height of main feed dog
The standard height is defi ned when the main feed dog 1 attains the highest level and the root section of the main feed
dog 1 coincides with the upper face of the main feed dog throat plate 2 .
(2) Height of differential feed dog
The standard height of the differential feed dog 3 is defi ned when the main feed dog 1 attains the highest level and
bottom face "B" of differential feed dog 3 lightly touch upper face "A" of main feed dog 1 .
Check for No bind.
(3) Adjustment of longitudinal movement of main feed dog
The maximum amount of feed of the main feed dog 1 is 3.6 mm. (Standard : 3.2 mm)
When the main feed dog 1 attains its maximum feeding amount, the standard positioning is secured when Clearance
"C" and Clearance "D" are equalized. Clearance "C" is defi ned as the distance from the feed groove front section of
the throat plate 2 to the front section of the main feed dog 1 in position where the main feed dog 2 stays in the most
advanced position. Clearance "D" is defi ned as the distance from the feed groove rear section of the throat plate 2 to the
rear section of the main feed dog 1 in position where the main feed dog 1 has attained the most retreated position.
(4) Adjustment of vertical height of main feed dog and differential feed dog
For the feed rocking lever eccentric pin 4 of the feed dog, the standard positioning of the groove is horizontal.
The vertical height of the main and differential feed dogs ( 1 and 3 ) can be simultaneously adjusted by turning the feed
rocking lever eccentric pin 4 . Basically, however, this function should be used in standard position.
(5) Gradient of main feed dog and differential feed dog
Front lowering condition is standard.
Height of main feed dog
1
Coincidence
Clearance of the main feed dog in
the most advanced position
1
C
2
Top surface
2
Longitudinal
directions
− 33 −
Height of differential feed dog
B
Lightly
touch
A
Clearance of the main feed dog
in the most retreated position
1
D
3
2