IBM Selectric Reference Manual

b. Late Style - With the carrier resting at the left
margin
stop, adjust the margin rack overbank guide
(Fig. 212) left or right on the margin rack to ob-
tain a clearance of .001" to .005" between the
stop latch on the carrier and the left hand margin
stop. On machines equipped with a floating stop
latch, the floating action of the latch must be re-
moved, by pulling the latch to the right with a
spring
hook, before this clearance can be observed.
The adjustment of the overbank guide on the mar-
gin rack determines the rest position of the margin
rack. The adjustment insures that the left margin
stop
wi II set accurately when the stop is sli d to the
right against the margin stop latch on the carri er.
In addition, the adjustment of the overbank guide,
plus the amount of lateral motion that the guide
permits the rack (due to the design of the guide)
during a carrier return operation, automatically
provides the carrier with the overbank required for
proper
escapement pawl re-entry at the completion
of a carrier return operation.
9. Clutch Unlatching - With either style margin rack held
to its extreme left position, the carrier return latch
keeper should clear the latch by .005" to .015" at the
unlatching point (Fig. 213). Check by manually hold-
ing the latch at the unlatching point whi Ie the machine
is idling •. Lengthen or shorten the carrier return unlat-
ching link to obtain this clearance.
/- ...........
/: j '\ Latch Held Even
Margin Rack ! ,11 With The Keeper Corner
Held To The II ~
Left ............
Margin Ra:k" / . .........
/ .005" to .015" ~
Clutch Unlatching Adjustment
NOTE: Should the clutch fail to properly latch (on
machines equipped with the Early Style margin rack)
after the clutch unlatching adjustment has been com-
pleted, check the margin rack eccentric adjustment
which is located in the Margin Control section. The
eccentric may be holding the rack too far to the left
restricting the margin rack motion thereby reducing the
amount of bite that the latch may take on the keeper.
10. Torque Limiter - The torque limiter should transmit 1 to
2 pounds pull on the carrier as the carrier is unlatching
the clutch at the left margin.
If a spring scale is avai lable, the adjustment may be
checked by holding against the carrier with the push
end of the scale and allowing the carrier to slowly un-
latch the clutch at the left margin.
2-72
If no scale is available, the torque may be estimated
by holding the carrier while the clutch is engaged. The
torque limiter should slip readily yet return the carrier
positively without any hesitation when the carrier is
released.
The adjustment is made by adjusting the eccentri c stud
in
the torque limiter hub. If sufficient adjustment is
not available at the eccentric, the torque limiter
spring may be shifted on the torque limited hub by po-
sitioning the torque limiter spring clamp.
NOTE: The carrier return clutch arbor should have an
end play of .004" to .006" between the torque limiter
hub
and the C-clip on the operational shaft. Adjust
the play by positioning the torque limiter hub laterally
on the shaft. The end play can be adjusted easily if
the torque limiter spring is moved to the right, off the
torque limiter hub.
11. Carri er Return Interlock Contact -
a. Form the N/C support so that the O/P lifts the
N/C contact .002" to .005" (Fig. 214).
b. Form the N/O support so that the O/p clears the
N/O contact .035" to .045" (Fig. 214).
O/P
N/C Support
FIGURE 214. Carrier Return Interlock Inactive
c. With the carri er return clutch latched, posi ti on
the mounting bracket so that the N/O contact
rises .010" to .020" from the N/O support (Fig.
215) .
NOTE: The N/O contacts must remain closed during
return
of the carrier to the left margin.
Excessive rise on the contact straps wi II cause the
contacts to bounce.
Latched Position
Mtg. Brkt.
N/O Contact
o
FIGURE 215. Carrier Return Interlock Active
NOTE: 835 Printer Interlock contact timing - make at
200
0
± 20
0
•

IBM Selectric Specifications

General

Type	Electric typewriter
Introduced	1961
Keyboard Layout	QWERTY
Carriage Return	Electric
Manufacturer	IBM
Printing Technology	Typeball (golf ball)
Power Source	AC Power
Power Supply	120V AC