Method and device for restarting typewriters and printers with s

Details Method and device for restarting typewriters and printers with s Method and device for restarting typewriters and printers with s

1987-07-27

1989-10-03

Wright, Jr., Ernest T.

Typewriting machines

Sheet or web

Including programmed-control-system for record-medium feed

400 5463/70/902, 318567, B41J 1142

Patent

active

048712728

ABSTRACT:
In a method for the operation of a typewriter, printer or the like with a stepping motor for the paper feed and a basic step inputting device, to accomplish feeding of the paper by a fraction of a line spacing, the feeding position set at the time of cutting off the machine is preserved by (1) storing the energization pattern last applied or information descriptive thereof in a value-preserving RAM at a first address, (2) storing a bit pattern contained in the control program in identical form at a second address of the value-preserving RAM, and (3) comparing the bit pattern of the control program which was stored in the second address of the RAM, when restarting the machine, with the bit pattern in the control program. The control program is stored preferably in a ROM of the central control unit, to verify as above the validity of the energization pattern stored in the RAM under the first address.

REFERENCES:
patent: 4085837 (1978-04-01), Takano et al.
patent: 4279523 (1981-07-01), Ringle
patent: 4497589 (1985-02-01), Figini
patent: 4550375 (1985-10-01), Sato et al.
IBM Technical Disclosure Bulletin, "Theft Protection for Typewriters", Compton, vol. 25, No. 4, Sep. 1982, pp. 1975-1977.
IBM Technical Disclosure Bulletin, "Memory Protect Circuit During Power Interruption", Ehrsam, vol. 26, No. 4, Sep. 1983, pp. 2046-2047.
IBM Technical Disclosure Bulletin, "Battery Backup Failure Detection", Desautels et al., vol. 26, No. 6, Nov. 1983, pp. 2811-2812.

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