Print-head positioning system having a paper sensor

Details Print-head positioning system having a paper sensor Print-head positioning system having a paper sensor

1989-09-08

1993-03-16

Burr, Edgar S.

Typewriting machines

Including adjustment for optimum printing plane

Responsive to thickness of record-medium

400 57, B41J 25308

Patent

active

051939185

ABSTRACT:
A printer with a print-head distance-setting device for adjusting the distance (1) between print head (2) and print-material counter support (3) for recording-material carriers (4) of unequal thickness, resting on the print-material counter support (3), including a mechanical sensing member (5) for controlling a print head (2), adjustable in a direction perpendicular relative to the longitudinal direction of the slider carriage motion, where the print head (2) is disposed on a longitudinally movable print-head slider carriage (7), which print-head slider carriage (7) in turn is guided with a pair of parallel guide axles (9), of which one guide axle (9) is supported by way of a pair of eccentric-disposed pins (10) and of which the second guide axle (9) is cross-movably supported in the printer side walls (32). In order to achieve a simpler and more easily constructed print-head distance-setting device, which can in addition be controlled more accurately, an electrical analog signal, generatable by the setting motions of the sensing member (5), serves in a converted configuration of an electronic digital signal in an electronic circuit (11) for the control of a step motor (12), supported at a printer frame, where the step motor (12) forms a servo drive (13) for the pair of eccentric-disposed pins (10) of the guide axle (9).

REFERENCES:
patent: 4233895 (1980-11-01), Wehler
patent: 4420269 (1983-12-01), Ackermann et al.
patent: 4611698 (1986-09-01), Lehmann
patent: 4676675 (1987-06-01), Suzuki et al.
patent: 4847638 (1989-07-01), Moriyama
patent: 4883375 (1989-11-01), Karube et al.
patent: 4917512 (1990-04-01), Mimura et al.

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