Combined paper advance and ink ribbon feed system
AssigneeMannesmann Aktiengesellschaft
InventorsLorenz Fromme, Wolfgang Hendrischk, Werner Rupp
Life of this patent
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Abstract
A matrix printer, having a movable print head, a paper feed and advance mechanism and an ink ribbon system, is driven by two motors; one for the print head and one for paper feeding and ribbon movement. This second motor is a reversible one and drives the paper advance when rotating in one direction and the ink ribbon when rotating in the opposite direction. Speed control for the paper feed phase is derived from a cam on the input shaft for the paper advance. A reset mechanism for that shaft is also included.
Claims11
In a printer having a print head, a paper advance mechanism, and an ink ribbon system, the print head being reversibly driven by a first motor, the combination for driving the paper advance mechanism and the ink ribbon system comprising:
- a second reversible motor;
- first means for coupling the paper advance mechanism to the second motor when rotating in a first direction;
- second means for coupling the ink ribbon system to the second motor when rotating in a second direction, opposite the first direction;
- and whereby
- the first and second means respectively are decoupled from the second motor when the second motor rotates in the second or the first direction.
In a matrix printer, a paper advance mechanism having a paper feed roller and comprising:
- a reversible motor;
- a shaft means;
- a one-way coupling means for coupling the shaft means to the motor when rotating in one direction only;
- a cam on the shaft means;
- control means operated by the cam;
- gear means for drivingly connecting the paper feed roller to the shaft means;
- and
- second control means operated by the first control means for causing the motor to reverse after one revolution of the cam.
Dependencies are inferred from the claim text.