IBM 01 Maintenance Manual page 42

MODEL 01
CUSTOMER ENGINEERING
4. Index pawl spring broken or loose
5. Detent roller arm out of adjustment
6. Broken or weak hook lever spring, causing failure
rotate the platen backwards
7. Worn detent roller
8. No lubrication on the hook lever spring
Maintenance
Lubricate all links, clevises, and pivot points with IBM
ET oil. To prevent the clutch pulley spring from rusting'
lubricate it by running the spring through an oily cloth:
Grease springs and bearing or sliding surfaces.
TABULAR MECHANISM
Depression of the tab key lever releases a single lobe cam(
As the cam assembly moves it develops a pull on the tao'
bell crank. The tab operating link transfers the motion of
the bell crank to the tab actuating lever. As the tab actuating
lever moves toward the front of the machine, it contacts the
tab lever and pivots it about its mounting point. This motion
moves the right end of the tab lever toward the rear, strik-
ing the pawl release lever and removing the escapement
pawls from the rack. The tab lever moves far enough to the
rear to allow the tab latch to spring in front of it and hold
the tab lever in the latched-out position. Tab lever extension
parts contact an upright stud of the rebound check lever,
moving the rebound check lever to the rear.
The carriage begins to move to the left under tension
of the main spring until the tip of the tab lever strikes a
set tab stop. This forces the tab lever over to the left and
allows it to become disengaged from the tab latch. Now the
tab lever begins to restore to its rest position, allowing tht{
pawls to re-enter the escapement rack. The rebound checlt
lever moves into place to the right of the set tab stop as the
tab lever is forced to the left. It is now in a position to block
any movement of the carriage toward the right as the car-
riage tends to rebound. When the tab lever restores to rest,
it moves the rebound check lever to rest (Figure 22).
As the tab lever is latching out, it moves the tab governoi,
pawl which engages the friction plate to regulate the speed
at which the carriage moves.
Removal
KEY LEVER, BELL CRANK AND CAM.
To remove these
parts, follow the procedure outlined under the
appropriat~
sections of this manual. '
TAB LEVER ASSEMBLY.
Unhook the tab lever spring and
remove the two mounting screws which secure the tab lever
assembly to the rear rail. Remove the margin rack, being
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