25.5±0.15mm
B
A
(8) Upper Feed Differential
– 11 –
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
is 1:1.
(9) Upper Feed Cam Timing
Requirement:
• When the needle is lowered, and the
inner presser foot is also lowered and
aligned with the upper surface of the
throat plate, the needle eyelet top end
should be aligned with the upper surface
of the throat plate.
A
B
Upper position (Direction
B
)
Smaller top feed amount
Lower position (Direction
A
)
Larger top feed amount
Standard Adjustment
Standard Adjustment
Top feed
Bottom feed
If the timing is early
(Direction A):
If the timing is late
(Direction B):
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