Upper Feed Differential; Upper Feed Cam Timing - JUKI DU-1181 Engineer's Manual

(8) Upper Feed Differential

(9) Upper Feed Cam Timing

Standard Adjustment
Standard:
• Attach the slide block assembly
through the long eccentric hole so
that the distance between the cen-
ter of the upper feed driving shaft
and the center of the slide block
assembly bolt becomes 25.5 ± 0.15
mm.
• The ratio of bottom feed to top feed
B
is 1:1.
A
Upper position (Direction
Smaller top feed amount
Standard Adjustment
A
B
)
B
Requirement:
• When the needle
inner presser foot
aligned with the upper surface
throat plate, the needle eyelet top end
should be aligned with the upper surface
of the throat plate.
If the timing is early
(Direction A):
– 11 –
Top feed
Bottom feed
Lower position (Direction
Larger top feed amount
is lowered, and the
is also lowered and
of the
If the timing is late
(Direction B):
)
A