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Overthrow: Check for 1-degree to 3-degree overthrow with
the clutch latched. The clamp should be replaced if the
clamp faces contact when tightened. The clutch spring
should be replaced if it becomes distorted.
4.6.9 Punch Clutch Adjustments
4.6.9.1 Standard Method
Sleeve Latching Surface Lead Distance: This adjustment
establishes the correct relationship between the clutch
spring and the outer and inner sleeves (Figures 4-24 and
4-25).
1. Loosen the clamping screw. The clamping collar is a
separate part and can be moved independently of the
innersleeve.
2. Trip the clutch armature and turn the index wheel(not
the drive pulley) forward until the inner- and outer-
sleeve latching surfaces can be observed.
3. Move the clamping screw to an accessible position while
holding the two sleeves with their latching surfaces
visible.
4. Turn the outer sleeve clockwise against the spring
(Figure 4-25). The sleeve moves very easily in a
counterclockwise direction. Therefore, keep the outer-
sleeve protrusion snug against the end of the spring to
avoid a false indication of the latching surface distances.
5. Position the inner-sleeve latching surface behind the
outer-sleeve latching surface as shown in Figure 4-25,
and keep the clamping screw accessible.
6. Tighten the clamping screw. While tightening this screw,
press the clamping collar and inner sleeve toward the
machine base, and keep the outer-sleeve protrusion
against the spring.
Latching Surfaces
Clamping Screw
Detent Collar
Outer Sleeve
Detent
Inner Sleeve
Clutch Spring
Clutch Drive Pulley
Figure 4-24. Punch Clutch Components
1/8" to 3/16"
Inner Sleeve
Outer Sleeve
Spring
Move Inner Sleeve
to Get Required
Measurement Between
Sleeve Latching Surfaces
Protrusion
Hold in Clockwise
Direction Keeping the Sleeve
Protrusion Snug Against the Spring
Figure 4-25. Punch Clutch Adjustment
Overthrow: This adjustment times the clutch to the index.
The clamping screw must be loosened so that the shaft can
be turned without disturbing the previously established
relationship between the spring and the inner and outer
sleeves.
1. Loosen the clamping screw approximately 1/4 turn.
Allow the shaft to be turned inside the spring with some
resistance, but not so loose that the spring will move
inside the innersleeve.
2. Turn the index wheel forward until the inner- and
outer-sleeve latching surfaces are driven against the
armature. (If you cannot turn the index beyondthis
point, the clamp is too tight; and it is necessary to
loosen the clamp more.)
3. Continue turning the index wheel forward to 347
degrees, 2 degrees beyond the point where the detent
drops into place. While turning the index wheel, hold the
inner sleeve against the armature to overcome the
tendency of the sleeve to move backward.
4. Tighten the clamping screw securely.
5. Check the clutch adjustment (use 4.6.8) and repeat if
necessary.
4.6.9.2 Alternate Method
The abbreviated method can be used to make the adjust-
ment after becoming more familiar with the operation of
the clutch.
1. Loosen the clamping screw and use the index wheel to
position the sleeve and collar to an accessible location.
2. Hold the outer sleeve against the spring tip, and set the
inner sleeve for the correctlead.
3. Tighten the collar so that the index can be turned with
some resistance after the sleeves are stopped by the
armature.
4. Turn the index wheel to 347 degrees and tighten the
clampsecurely.
5. Check the clutch adjustment (use 4.6.8) and repeat if
necessary.
29FEMM~
(4/69)
4-13
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