Carrier Return - IBM Selectric Reference Manual

No
Check Cam Release Lever and Lug 6.4
Binds or Rust on Cam or Release Lever
Interposer Spring Off Or in Wrong Hole
Wrong Spring I. I I
Keylever Pawl Spring
See Out t Mode
Check:
Latch
Cam Follower Is Broken
CARRI ER RETURN
No
Carrier Return Latch Eccentric Stud Off or Loose •
• Figure
6.0
6.0
6.1
6.2
6.3
6.4
6.5
CARRIER RETURN
Carrier Return Adjustments
With the Margin Rack held to the left, adjust the
unlatching link so that the keeper clears the actuat-
ing arm by
.005 11
-
.015 11
•
Adjust for a minimum of
.010",
maximum of
.020 11
clearance between the C/R S hoe and the Spri ng
Clutch. Note: The Carrier Return Spring Clutch
C lamp may be off or broken.
Adjust the Carrier Return Arm Screw for
.030
11
-.040"
overthrow between tne latch and the keeper with the
C/R Cam on the high point. The latch overthrow is
affected by platen load; therefore, insure that the
Platen is installed when making this adjustment.
With the interposer and cam latched, the release arm
lug should clear the interposer by
.025" - .035".
Binds - Check the following:
a. Feed Roll Mounting Arm hits the Tab Overthrow
Stop.
b. Dust Covers - Card Holders.
c. Anvi I and Front Carrier Shoes.
'd. Rear Carrier Shoe.
e. Escapement Cord is off its pulley.
f. Pinion Gear.
6.6
6.7
6.8
6.9
5-10
Yes
No
No
Carrier Return Latch To Keeper Clearance 6. I
Carrier Return Latch Overthrow 6.3, 6.10
Broken Spring Clutch
Left Margin 6.6
Nylon Shoe To Spring Clutch Clearance 6.2
An uneven left margin may be caused by:
a. The Clutch Unlatching Link being too short.
b. The overbank adjustment.
c. A worn Escapement Pawl. (Fig. 3. 1)
S.H.
The Tab Governor Spring Clutch must be free of
rust, di rt, and excess oi I. Too much oi I wi II cause
the clutch to bind or drag.
The Carrier Return Pinion and Spring Clutch must
a Iso be free of rust, dirt and oi I. Excess oil wi II
cause sluggish Tab and Escapement operation.
S. H. TORQUE LIMITER
Adjust the Extension Spring for 1 - 2 lb. of tension
on the Carrier, while holding the Carrier against a
carrier return operation. If the Torque Limiter
Spring appears to ride off the right side of the arbor,
replace the Extension Spring with a spring P/N
1115382
and readjust.
S . H. CARRI ER RETURN FAI LURES
Some partia I return fai lures can be traced to a
rounded edge on the CR latch. If this problem is
experi enced, rep lace the latch, PN
1128168.
Cur-
rent producti on latches have been reworked to
eliminate this possibility.