Dot-matrix printer with dot counter for efficient high-quality p

Details Dot-matrix printer with dot counter for efficient high-quality p Dot-matrix printer with dot counter for efficient high-quality p

1985-09-23

1987-03-31

Sewell, Paul T.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

400 54, 400124, B41J 312

Patent

active

046539409

ABSTRACT:
A dot-matrix printer with a print head having plural print elements which are disposed in a row and selectively activated to form a dot or dots in a vertical row of a dot matrix pattern representing a character, comprising: a device for calculating a dot ratio which is a ratio of the number of dots to be formed in a ratio-check area consisting of a predetermined number of vertical rows of dots in a print line, with respect to the maximum number of dots formable in the ratio-check area; a device for moving the ratio-check area along the print line; a device for checking if the dot ratio has exceeded a reference value; and a control device for printing the characters in the print line in plural movements of the print head if the print line includes the ratio-check area the dot ratio of which has exceeded the reference value. Also disclosed a dot-matrix printer, comprising a device for adding to a content of a memory numbers of dots which are formed by the print elements; a device for measing a time lapse; a device for subtracting a predetermined value from the content of the memory, at predetermined time intervals; a device for checking whether the content of the memory has exceeded a reference value; and a control device for controlling the print head so as to cool the print head if the content of the memory has exceeded the predetermined value.

REFERENCES:
patent: 4415907 (1983-11-01), Suemori
patent: 4464669 (1984-08-01), Sekiya
patent: 4536774 (1985-08-01), Inui
patent: 4574293 (1986-03-01), Inui
IBM Tech. Disc. Bulletin, by B. R. Cavill, vol. 24, No. 11A, Apr. 1982, pp. 5430-5432.

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