Repeat action mechanism for power-operated typewriters

Claim 1

A repeat action mechanism for cyclically operating an instrumentality in a power-operated typewriter comprising, in combination, a frame, a rotatable toothed snatch roll mounted on the frame, a member operatively connected to the instrumentality and mounted on the frame for reciprocating movement from and to a normal position, said member being normally held in the normal position, a pawl rockably mounted on the member for rocking movement relative to the member to engage with and disengage from the roll, a trigger rockably mounted on the member for rocking movement relative to the member, a spring anchored to the pawl and trigger for urging the pawl in a direction for engaging the pawl with the roll, said trigger having a contacting portion for contacting the pawl to normally hold the pawl in the disengaged position from the roll against urging of the spring and tracing a fixed path during return of the member to the normal position, a key lever mounted on the frame for depression from a normal position to a first depressed and a second further depressed position, a control lever pivotally mounted on the key lever and having a first and a second portion formed on the free end thereof, a bottom end of said first portion being arranged to contact the trigger and urging the trigger transversely to the fixed path, upon depression of the key lever, to rock the trigger so as to release the pawl from the trigger and engage the pawL with the roll thereby initiating the operation of the instrumentality, and disengaging means mounted on the frame for rocking the pawl relative to the member to disengage the pawl from the roll following the movement of the member from the normal position, means for locating said first portion in said fixed path when the key is held depressed in either of said depressed positions for engaging with an end of the trigger returning with the member, whereby the trigger rocks the control lever to carry the first portion out of the fixed path and when the key lever is held depressed in the first depressed position with the trigger completely carrying the first portion out of the fixed path to thereby terminate the operation of the instrumentality in one cycle, and means arranging said second portion for contacting the trigger, when the key lever is held depressed in the second position, for urging the trigger transversely to the fixed path before the first portion is completely carried out of the fixed path thereby releasing the pawl from the trigger to engage the roll and to thereby cyclic repeat operation of the instrumentality.