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3b.
Unlatching Motion
Tab latch engaged on, keeper
Tab latch Keeper
Figure 50. Tab Lever Mechanism
Adjusting Nuts
Figure 51. Friction Governor Mechanism
felt glued to the main spring drum. This control on
the rotation of the main spring drum provides a method
of reducing excessive carriage speed during tabulation.
The governor pawl is mounted by elongated holes to
a lIow the carriage to bui Id up some momentum before
the braking action of the governor begin.s.
Machines above serial number
475,055
contain a tabu-
lar governor mechanism designed to provide a uniform
carriage speed during tabular operation. The main
spring is wound in the opposite direction to the exist-
ing main spring for best operation of the governor.
The improved mechanism includes a4-inch plastic gear
25
Clutch Governor
Figure 52. Centrifugal Tab Governor
attached to the main spring drum. This gear is used to
drive a pinion gear which is attached to the centrifugal
governor assembly (Fig.
52).
Inside the governor housing are two governor arms.
During tabulationi the governor arms are thrown out,
due to centrifugal force, against the inside of. the gover-
nor housing. This causes a braking action which slows
the speed of the carriage. A spring attached between
the two governor arms is positioned to control the a-
mount of governor action. By positioning this spring
closer to the governor arm pivot points, more governing
action is obtained. To increase the carriage speed,
the spring should be moved away from the. governor arm
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