Periodically, check the fit of the controller cam rollers between the
upper and lower rails. Occasionally the upper rail needs to be adjust-
ed downward to compensate for the wear of the cam rollers and rail
edges. If the machine automatically advances noticeably farther when
the carriage is at one end, the roller fit may be loose and the upper rail
should be adjusted downward to remove the excess clearance. Then
move the cam to both ends of the rail and verify that the cam moves
freely. Periodically lubricate the cam rollers and wearing edges of the
rails with grease to prevent undue wear. Check the cam rollers for flat
spots and replace if necessary.
When the controller is properly adjusted, the carriage decelerates
to slow motion, the machine moves forward and the carriage travel
reverses and accelerates smoothly. If the carriage does not slow, but
goes in and out too fast during travel reversal, the cam arm needs to be
adjusted. The cam arm is provided with a slot to fine tune the carriage
travel shift speed. Adjust the cam arm clockwise, relative to the valve
shift, to reduce the travel speed and counter clockwise to increase the
travel speed.
For maximum automatic machine travel and to avoid carriage jerking it
is important that the carriage does not move
in and out of travel reversal to fast. If the cam arm is adjusted to far,
however, the carriage travel will be stopped and only machine travel
will result. In this case, the cam arm should be “backed up” to obtain
a slower carriage movement during shift and also allow maximum
automatic machine travel.
SECTION 3
SERVICE
050362
Page 56
3.2 - Shifting Mechanism Adjustment,
continued
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