Printing apparatus having head gap adjusting device

Details Printing apparatus having head gap adjusting device Printing apparatus having head gap adjusting device

1994-09-12

1996-03-19

Funk, Stephen

Typewriting machines

Including adjustment for optimum printing plane

Responsive to thickness of record-medium

400 59, B41J 1120

Patent

active

054998760

ABSTRACT:
A printing apparatus includes a printing head for printing on a bank book, a platen disposed opposite the printing head, and a cam mechanism for moving the platen. A sensor detects the thickness of the bank book which is between the printing head and the platen, and a sensor moving mechanism moves the sensor toward or away from the platen. A controller controls the operation of the cam mechanism and the sensor moving mechanism as the sensor is moved to a measuring position approaching the printing head. The printing head is moved toward the platen according to a detected value and then the sensor is retracted from the measuring position. As a result, after moving the printing head, the sensor does not contact the surface of the bank book, and therefore does not produce jamming or oblique feeding of the bank book during a line feed or printing operation.

REFERENCES:
patent: 4589784 (1986-05-01), Valle et al.
patent: 4676675 (1987-06-01), Suzuki et al.
patent: 4780007 (1988-10-01), Weeks et al.
patent: 5074685 (1991-12-01), Shimizu et al.

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