Device for controlling the carriage return of a lead screw drive

Details Device for controlling the carriage return of a lead screw drive Device for controlling the carriage return of a lead screw drive

1984-08-08

1986-09-23

Pieprz, William

Typewriting machines

Carriage or carriage-moving or movement-regulating mechanism

Carriage-return mechanism

400317, 400322, 400328, B41J 1968

Patent

active

046132457

ABSTRACT:
Disclosed is a travelling control of printing head in which when a printing head is to be returned to its home position, the printing head is returned in a selected one of two modes, the first mode being such that a lead screw is reversely rotated upon completion of a desired printing operation to cause the printing head to return to its home position through a first guide groove provided for the forward travelling of the printing head and the second mode being such that the lead screw is rotated forward even after the completion of the desired printing operation and the guide groove is changed from the first one to a second one which is provided only for the return travelling of the printing head and which has a pitch larger than that of the first one so that the printing head can be quickly returned to its home position at a speed higher than that in the forward travelling. Thus, the return mode can be selected such that the time required for the printing head to return to its home position in the selected mode is shorter than in the other mode.

REFERENCES:
patent: 3628645 (1971-12-01), McFeaters et al.

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