Copy holder

Claim 2

In a data-sheet handling copy holder for use as an adjunct to a typewriter or other operator-indexed data machine, the copy holder comprising a copy holder head, a platen having a shaft journaled in said head, pressure means carried by said head for coacting with the platen to hold a data sheet therebetween, and drive means for periodically incrementally advancing the angular position of said platen shaft, said drive means comprising a positive-displacement pulse-operated motor having an output shaft coupled to said platen shaft and producing an incremental angular output-shaft advance which is directly proportional to the time duration of an input control-pulse signal, and control means for said motor, said control means comprising pulse-generator means operatively connected to said motor for supplying a control-pulse signal of predetermined duration, the improvement wherein said control means includes selector-switch means providing a selected one of first and second selectively available control inputs to said pulse-generator means and respectively determining first and second control-pulse signal outputs of predetermined first and second time duration, and push-button means operative upon said generator means for initiating the production of a pulse of thus-selected duration.

Claim 3

The copy-holder improvement of claim 1, wherein said control means includes selectively variable means operative upon at least one of said control inputs to said pulse-generator means for selectively varying the effective time duration of said one control input.

Claim 4

The copy-holder improvement of claim 1, wherein said control means includes independently selectively variable means for each of said switch-selected control inputs for independently selectively varying the effective time duration of each of said control inputs.

Claim 5

The copy-holder improvement of claim 1, wherein said selector-switch means includes a further operative position in which said push-button means is operative to continuously drive said motor as long as said push button is actuated.

Claim 6

The copy-holder improvement of claim 1, in which said motor includes electrically operated brake means operative upon said output shaft to brake the same against coasting rotation.

Claim 7

The copy-holder improvement of claim 1, in which said control means includes selectively operable means for determining the drive direction of said motor shaft.

Claim 8

The copy-holder improvement of claim 1, in which said control means is contained in a control unit having flexible electric-cable connection to said copy-holder head.

Claim 9

The copy-holder improvement of claim 1, in which said push-button means is a foot switch having flexible electric-cable connection to said pulse-generator means.

Claim 10

The copy-holder improvement of claim 1, in which said motor is of the high-torque synchronous hysteresis variety.

Claim 11

The copy-holder improvement of claim 1, in which said motor includes a friction-clutch connection to said platen shaft, and externally accessible selectively operable means for manually adjusting the angular position of said platen shaft.

Claim 12

A data-sheet handling copy holder for use as an adjunct to a typewriter or other operator-indexed data machine, the copy holder comprising a copy holder head, a platen having a shaft journaled in said head, pressure means carried by said head for coacting with said platen to hold a data sheet therebetween, and reversible drive means for periodically incrementally advancing the angular position of said platen shaft, said drive means comprising a positive-displacement pulse-operated motor having an output shaft coupled to said platen shaft and producing an incremental angular output-shaft advance which is directly proportional to the time duration of an input control-pulse signal, and control means for said motor, said control means comprising pulse-generator means operatively connected to said motor for supplying a control-pulse signal of predetermined duration, said control means including first selectively operable means for selecting the direction of drive of said motor, second selectively operable means providing a selected one of first and second selectively available control inputs to said pulse-generator means and respectively determining first and second control-pulse signal outputs of predetermined first and second time duration, and push-button means operative upon said generator means for initiating the production of a pulse of thus-selected duration.

Claim 13

A data-sheet handling copy holder for use as an adjunct to a typewriter or other operator-indexed data machine, the copy holder comprising a copy holder head, a platen having a shaft journaled in said head, pressure means carried by said head for coacting with said platen to hold a data sheet therebetween, and reversible drive means for periodically incrementally advancing the angular position of said platen shaft, said drive means comprising a positive-displacement pulse-operated motor having an output shaft coupled to said platen shaft and producing an incremental angular output-shaft advance which is directly proportional to the time duration of an input control-pulse signal, and control means for said motor, said control means comprising pulse-generator means operatively connected to said motor for supplying a control-pulse signal of predetermined duration, said control means including first selectively operable means for selecting the direction of drive of said motor, second selectively operable means providing a selected one of first and second selectively available control inputs to said pulse-generator means and respectively determining first and second control-pulse signal outputs of predetermined first and second time duration, and push-button means operative upon said generator means for initiating the production of a pulse of thus-selected duration.