Printer having gap adjusting apparatus for print head

Details Printer having gap adjusting apparatus for print head Printer having gap adjusting apparatus for print head

1992-03-12

1992-10-20

Crowder, Clifford D.

Typewriting machines

Including adjustment for optimum printing plane

Responsive to thickness of record-medium

400 55, 400 59, B41J 1120

Patent

active

051564645

ABSTRACT:
The invention provides an apparatus capable of manually adjusting a gap between a print head and a platen so as to prevent a print operation from being executed when the gap is outside of an appropriate range for a paper being used. The position of the print head can be manually adjusted by use of an adjusting lever. Further, the print head can be moved by a step motor under the control of a CPU to adjust the gap. After the gap adjustment is accomplished by the adjusting lever, the CPU causes the print head to shift toward a rear standard position and stores the count N1 of driving pulses required for the shift movement. The set printing gap is detected on the basis of this value N1. The print head is then moved until it contacts the printing sheet and a count N2 of driving pulses required for the contact movement is stored in the memory of the CPU. The paper thickness is measured on the basis of this value N2. Based on the paper thickness, an adequate gap range is read out from the ROM and, if the set printing gap is outside of this range, a warning is given.

REFERENCES:
patent: 4676675 (1987-06-01), Suzuki
patent: 4865475 (1989-09-01), Takahashi
patent: 4881835 (1989-11-01), Niikawa
patent: 4974974 (1990-12-01), Yoshida et al.
patent: 4990004 (1991-02-01), Kawahara et al.
patent: 5074685 (1991-12-01), Shimizu et al.
patent: 5088842 (1992-02-01), Ito et al.
patent: 5088843 (1992-02-01), Hori

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