Escapement-initiating mechanism for typewriter

Claim 1

In a typebar printing mechanism: a. an escapement trip structure coupled to a shaft and responsive to limited angular reciprocal rotation of said shaft about its axis for initiating an escapement action; b. first and second means for initiating limited angular reciprocal rotation of said shaft; c. a ribbon lift structure coupled to a pivoted ribbon lift bar and responsive to the pivoting of said ribbon lift bar for raising a print ribbon guided by said ribbon lift structure to a print position; d. actuating means responsive to each printing cycle of the typebar printing mechanism for pivoting said ribbon lift bar; e. said first means comprising a first plurality of coupling links between said shaft and said ribbon lift bar for initiating limited angular reciprocal rotation of said shaft in response to each pivoting action of said ribbon lift bar; f. said second means comprising a second plurality of coupling links between said shaft and an actuator for initiating limited angular reciprocal rotation of said shaft in response to the selective operation of said actuator and without any pivoting action of said ribbon lift bar; g. said first plurality of coupling links including a one-way drive linkage for inhibiting the pivoting of said ribbon lift bar in response to the actuation of said second means; and h. said second plurality of coupling links including a one-way drive linkage for inhibiting the actuation of said actuator in response to the actuation of said first means.