High speed variable intensity printing system

Details High speed variable intensity printing system High speed variable intensity printing system

1979-06-07

1981-11-24

Wright, Jr., Ernest T.

Typewriting machines

Including type-set-assemblage mounted on carrier and...

Imprint by pivoting of type-head-carrier and type-head...

400320, B41J 132

Patent

active

043021174

ABSTRACT:
The present invention relates to a high speed printing system, in which the printing intensity of each type element, applied onto a record media, is varied in accordance with the surface area of the type element. The system employs a double control mode, in each hammering operation, for carrying out the variation of the printing intensity. The double control mode is comprised of a first control mode and a second control mode, which follows immediately after the first control mode. In the first control mode, a maximum energizing current is supplied to a hammer means, comprising a dc motor, for hammering a selected type element to produce a desired character on the record media. In the second control mode, an energizing current is applied to the hammer means. The latter energizing current has variable peak amplitude which is suitable for carrying out fine control of the printing intensity in accordance with the size of the surface area of each type element.

REFERENCES:
patent: 3628644 (1971-12-01), Cralle et al.
patent: 3712212 (1973-01-01), Beery
patent: 3858509 (1975-01-01), Grundherr
patent: 3866533 (1975-02-01), Gilbert et al.
patent: 3980169 (1976-09-01), Decker et al.
patent: 4062285 (1977-12-01), Deetz et al.
patent: 4103617 (1978-08-01), O'Brien et al.
patent: 4162131 (1979-07-01), Carson et al.
patent: 4162858 (1979-07-01), Brandenburg
patent: 4192230 (1980-03-01), Blom et al.
patent: 4192619 (1980-03-01), Lau
IBM Technical Disclosure Bulletin, "Character Impression Control Mechanism", Engles, vol. 1 No. 4 Dec. 1958, p. 44.
IBM Technical Disclosure Bulletin, "Print Hammer Flight Time Variation Control", Barcomb et al., vol. 22 No. 8A Jan. 1980, pp. 3171-3172.

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