JUKI 35800 Series, Руководство инженера

Страница: 28 / 61

– 24 –
(8) Adjustment of feed dog height and longitudinal movement (differential feed dog mechanism)
1) Height of main feed dog
The standard height is defined when the main feed dog attains the highest level and the root section of
the main feed dog coincides with the upper face of the main feed dog throat plate .
2) Height of differential feed dog
The standard height of the differential feed dog is defined when the main feed dog attains the highest
level and a clearance of 0.05 to 0.1mm is secured between the upper face "A" of the main feed dog and
the bottom face "B" of the differential feed dog .
3) Adjustment of longitudinal movement of main feed dog
The maximum amount of feed of the main feed dog is 3.6 mm. (Standard: 3.2 mm)
When the main feed dog attains its maximum feeding amount, the standard positioning is secured when
Clearance "C" and Clearance "D" are equalized. Clearance "C" is defined as the distance from the feed
groove front section of the throat plate
to the front section of the main feed dog in position where the
main feed dog stays in the most advanced position. Clearance "D" is defined as the distance from the
feed groove rear section of the throat plate to the rear section of the main feed dog {1} in position where
the main feed dog has attained the most retreated position.
4) Adjsutment of vertical height of main feed dog and differential feed dog
For the feed rocking lever eccentric pin of the feed dog, the standard positioning of the driver groove is
horizontal.
The vertical height of the main and differential feed dogs (
and ) can be simultaneously adjusted by
turning the feed rocking lever eccentric pin . 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.
Top surface
Coincidence
Height of main feed dog
0.05 to 0.1mm
B
A
Height of differential feed dog
Clearance of the main feed dog in
the most retreated position
Longitudinal
directions
Clearance of the main feed dog
in the most advanced position
D
C
Driver groove
Standard Adjustment