IBM B-1 Instruction Manual page 34

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Figure 62. Air Cylinder

The margin control bellcrank aslo keeps the carriage return tab

interlock from rotating and through the I inkage prevents the

clutch latch from following the clutch lever. As the carriage

return cam completes its rotation, all parts restore to rest and

the oper(ltion is complete.

In both of the above operations, the pull on the carriage return

tape operates the

ne space mechan i sm to index the platen.

The tape pulls the index pawl carrier down against the tension

of the spring loaded. index lever. As the pawl knockout lever

leaves the upper index pawl stop, the index pawl is allowed to

rotate under spring tension. This rotation raises the index pawl

knockout lever, and allows the point of the index pawl to move

forward and engage a platen ratchet tooth. The ratchet is ro-

tated until the index pawl strikes the lower index pawl stop.

The rotation of the ratchet has caused a ratchet tooth to lower

the spring loaded detent roller as the tooth passes over the

roller. As the index pawl strikes the lower stop, the detent

roller again enters the low point between two ratchet teeth

(Ind holds the ratchet in the new position (Fig. 63). The rat-

chet has serrations .within its inner circumference that are en-

gaged with matching serrations on the platen ratchet driver

Left Platen Knob

Detent Release

lever

Figure 63. Detent Release

(Fig. 64). The driver is confiRed to an elongated slot in the

platen end plug, so that any rotation of the ratchet causes

the driver and the platen to rotate the same amount. The

Serrations

Bushing

Release Shaft

Set Screw

pi'tE'i1

End Plug·::

Platen Var iable Button Tool

Figure 6:4. Platen Mechanism

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