JUKI MF-7900 Series Engineer's Manual page 115

Adjustment procedures
1. Adjusting the upper knife pressure
Standard adjustment position of thrust collars ❶ and ❷ is such that
a clearance of 10 mm is provided between them.
Place thrust collar ❶ between spring ❺ and bushing ❸ . Press
thrust collar ❶ against the end face of bushing ❸ and Fix thrust
collar ❶ , using setscrew ❹ , with pressed against the end face of
bushing ❸ .
(1) To increase the knife pressure
Move thrust collar ❷ to the left (in direction A). Then, tight-
en setscrew ❻ . Loosen setscrew ❹ of thrust collar ❶ once.
Tighten setscrew ❹ to fix thrust collar ❶ with pressed against
the end face of bushing ❸ by the spring pressure.
(2) To decrease the knife pressure
Move thrust collar ❷ to the right (in direction B). Then, tight-
en setscrew ❻ . Loosen setscrew ❹ of thrust collar ❶ once.
Tighten setscrew ❹ to fix thrust collar ❶ with pressed against
the end face of bushing ❸ by the spring pressure.
* Standard assembly procedure of the thrust collar for the MF-
7900-H22,23:
Assemble the thrust collar, spring and thrust collar in the written
order.
(Caution) Set the knife pressure as low as possible within the
range where cloth is smoothly cut for use.
2. Adjusting the lateral position of the lower knife
(1) Loosen waste cloth pipe setscrews ❼ .
(2) Loosen lower knife holder setscrew ❽ , and move lower knife
holder ❾ in the lateral direction to adjust.
(3) After the adjustment, fix it with lower knife holder setscrew ❽ ,
and perform "7.-(2)-1. Adjusting the upper knife pressure".
(4) Perform the adjustment of the position of waste cloth pipe with
waste cloth pipe setscrews ❼ .
Results of Improper adjustment
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