IBM Selectric - Page 13

1/16" To 3/32"
FIGURE 30. Radial Position of Cycle Clutch Collar
4.
3. Release the cycle clutch again by depressing
a keybutton.
4. Slowly hand cycle the machine unti I the check
pawl just drops into a tooth on the check rat-
chet. The print shaft gear should have rotated
one tooth so that the next tooth is in line with
the pencil mark. If the print shaft gear rotated
further than one tooth the collar must be moved
top toward the rear. Less than one tooth, move
it top toward the front.
A zero ti It, negative-five rotate character is used
because it offers the greatest resistance to the cycle
shaft during the restoring portion of a cycle, caus-
ing the cycle clutch spring to slip at the earliest
possible time.
NOTE: If the collar should become completely
loose, a good starting point may be obtained by
positioning the collar so that its adjusting screw
head is approximately in line with the high point
of the negative-five cam.
CAUTION: The cycle clutch stop attached to the
collar may prevent the shaft from reaching the
latched position. Any change in the cycle clutch
collar adjustment will necessitate a readjustment
of the stop; therefore it is usually best to loosen
the stop before attempting to adjust the collar.
Cycle Clutch Overthrow Stop - with the cycle cl utch
latched and the cycle shaft backed up against the check
pawl in its rest position, advance or retard the overthrow
stop on the cycle clutch collar so that it wi II allow the
cycle shaft to overthrow its latched position by .001"
to .015" {Fig. 31-New Style or Fig. 32-01d Style}.
NOTE: It is best -to set this adjustment on the low side
of the tolerance. Too much cycle shaft overthrow com-
bined with excessive backlash in the gear train could
allow the filter shaft to overthrow into the path of the
character interposers. This condition could result in
intermittent keyboard lock-up or intermittent touch pro-
blems.
11
Cycle Shaft Must Be Detented
When Setting The .007" To
.015" Overthrow
.007" To .015"
I
Pulley
FIGURE 31. Cycle Clutch Overthrow Stop,
New Style
FIGURE 32. Cycle Clutch Overthrow Stop,
Old Style
CAUTION: After adjusting the cycle clutch overthrow
stop check the cycle clutch sleeve end playas the over-
throw stop may bind against the sleeve.