Information printing methods and apparatus

Details Information printing methods and apparatus Information printing methods and apparatus

1985-04-12

1985-12-03

Swell, Paul T.

Typewriting machines

Including adjustment for optimum printing plane

By adjustment of platen relative to carriage

400470, 400662, B41J 1120, B41J 11057

Patent

active

045563330

ABSTRACT:
Methods and apparatus for printing information on a sheet of material provide a circular platen with a first peripheral portion having a first radius and a second peripheral portion having a second radius exceeding the first radius. Such circular platen is mounted for rotation about an axis adjacent a print head. A sheet entry gap is provided between the platen and the print head by moving the first peripheral portion about the mentioned axis into first proximity to the print head, and a sheet is entered into such entry gap between the platen and the print head. A print gap relative to the print head is provided by moving the second peripheral portion of the platen about the mentioned axis into second proximity to the print head at the entered sheet. Since the mentioned first proximity is larger than the latter second proximity, jamming of the entering sheet at the print head is effectively avoided. On the other hand, the resulting smaller proximity readily permits realization of whatever small print gaps are typically required by dot-matrix print heads or other printing devices which print the desired information on the sheet at the print gap.

REFERENCES:
patent: 3967550 (1976-07-01), Busch
patent: 4069755 (1978-01-01), Beery
patent: 4462702 (1984-07-01), Fritz et al.
IBM Tech. Disc. Bulletin, R. H. Darling, vol. 9, No. 9, Dec., 1966, p. 907.

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