US PATENT SUBCLASS 400 / 220
.~.~ Alternative pawl-and-ratchet drive including ratchet directly connected to spool or spindle

Current as of: June, 1999
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400 /   HD   TYPEWRITING MACHINES

191  DF  INCLUDING INTERPOSED INKING DEVICE (E.G., RIBBON) FOR RECORD-MEDIUM {15}
218  DF  .~ Ribbon-reversing mechanism {4}
220.~.~ Alternative pawl-and-ratchet drive including ratchet directly connected to spool or spindle {2}
220.1  DF  .~.~.~> Including a common pawl member (e.g.. double-toothed pawl)
220.2  DF  .~.~.~> Including member interposed in pawl drive path

DEFINITION

Classification: 400/220

Alternative pawl-and-ratchet drive including ratchet directly connected to spool or spindle:

(under subclass 218) Subject matter wherein opposite ends of the ribbons* are attached respectively to first and second cylindrical members, the first member having a first ratchet* secured thereon to be driven by a first pawl* and thereby move the ribbon in the first direction by winding it on the first member, and the second member having a second ratchet secured thereon to be driven by a second pawl and thereby move the ribbon in the opposite direction by winding it on the second member, and wherein means are provided for causing the first pawl to be operative in its driving relationship with the first ratcher while the second pawl is caused to be inoperative, or for causing the second pawl to be operative in its driving relationship with the second ratchet while the first pawl is caused to be inoperative.

SEE OR SEARCH THIS CLASS, SUBCLASS:

236.1, for pawl-and-ratchet drive for ribbon feeding.