JUKI MF-7900 Series Engineer's Manual page 55

Adjustment procedures
(1) Changing the feed driving motion
Loosen two setscrews of the feed driving eccentric cam ❶ .
1)
Carry out the adjustment when the hole A in the feed driving
rod ❷ aligns with the setscrew of the feed driving eccentric
cam ❶ .
Shift the 2nd pin ❸ to the left.
2)
Bring the feed driving eccentric cam ❶ into contact with the po-
3)
sitioning cam ❹ .
Tighten two setscrews of the feed driving eccentric cam ❶ .
4)
5) To return the timing to the standard adjustment, return the 2nd
pin ❸ to its home position. Assemble the feed driving eccentric
cam ❶ and the 2nd pin ❸ so that they come in contact with
each other. (To obtain the timing of the standard adjustment,
the 2nd pin ❸ should be positioned at the rightmost end of the
hole.)
(Caution) Check to be sure that "the 2nd pin ❸ or the position-
ing cam ❹ is in contact with the feed driving eccen-
tric cam ❶ " so as to prevent the setscrews from
loosening.
Note that, however, the 2nd pin ❸ can move to the
right or left. It is therefore necessary to make sure
that a clearance is provided between feed driving ec-
centric cam ❶ and positioning cam ❹ before check-
ing the timing.
(2) Changing the feed rocking motion
Loosen two setscrews of the feed rocking eccentric cam ❺ .
1)
Carry out the adjustment when the hole B in the feed rocking
rod ❻ aligns with the setscrew of the feed rocking eccentric
cam ❺ .
Shift the 1st pin ❼ to the right.
2)
Bring the feed rocking eccentric cam ❺ into contact with the
3)
positioning cam ❹ .
Tighten two setscrews of the feed rocking eccentric cam ❺ .
4)
5) To return the timing to the standard adjustment, return the 1st
pin ❼ to its home position. Assemble the feed rocking eccen-
tric cam ❺ and the 1st pin ❼ so that they come in contact with
each other. (To obtain the timing of the standard adjustment,
the 1st pin ❼ should be positioned at the leftmost end of the
hole.)
(Caution) Check to be sure that "the 1st pin ❼ or the position-
ing cam ❹ is in contact with the feed rocking eccen-
tric cam ❺ " so as to prevent the setscrews from
loosening.
Note that, however, the 1st pin ❼ can move to the
right or left. It is therefore necessary to make sure
that a clearance is provided between feed rocking ec-
centric cam ❺ and positioning cam ❹ before check-
ing the timing.
Results of Improper adjustment
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