Printer with print gap control

Details Printer with print gap control Printer with print gap control

1992-09-30

1993-11-02

Eickholt, Eugene H.

Typewriting machines

Including adjustment for optimum printing plane

Responsive to thickness of record-medium

400 57, 400 59, 400124, B41J 2528, B41J 1120

Patent

active

052578674

ABSTRACT:
A printer having an adjusting apparatus for adjusting a head gap between a print head and a print sheet supported on a platen, is disclosed. In such printer, at first, a carriage 1 mounting the print head 8 thereon is advanced to the print sheet 6 by eccentrically rotating a guide bar 3 passed through a slide hole 1a with a solidable lubricant therebetween through a step motor 12 until a ribbon mask 9 contacts to the print sheet 6. And a drive pulse number Nm, which is input to the step motor 12 until the ribbon mask 9 contacts to the print sheet 6 and corresponds to moving distance of the carriage 1 from a standard position O, is calculated. Further, a value Na (=N1-Nm) representing a drive pulse number for the step motor 12 corresponding to a thickness of the print sheet 6, is calculated. Here, the N1 is a drive pulse number necessary to advance the carriage 1 toward the platen 2 till the ribbon mask 9 contacts to the platen 2 in case that the print sheet 6 is not supported on the platen 2 and stored in a NVRAM 29. Next, it is judged whether the calculated Na is bigger than or equal to a NaO which is stored in a ROM 25 and corresponds to a drive pulse number for the step motor 12 necessary to obtain the optimum gap between the print head 8 and the print sheet 6 when the print sheet 6 with 0.4 mm thickness is utilized.

REFERENCES:
patent: 4652153 (1987-03-01), Kotsuzumi et al.
patent: 4676675 (1987-06-01), Suzuki et al.
patent: 4990004 (1991-02-01), Kawahara et al.
patent: 5037217 (1991-08-01), Suzuki et al.
patent: 5051008 (1991-09-01), Honda et al.
patent: 5074685 (1991-12-01), Shimizu et al.
patent: 5118209 (1992-06-01), Bennet et al.
patent: 5156464 (1992-10-01), Sakai
patent: 5156466 (1992-10-01), Inagaki

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