Printer

Details Printer Printer

1992-03-16

1993-03-09

Burr, Edgar S.

Typewriting machines

Sheet or web

Including skew correction responsive to position of sheet or...

400630, 271226, 271245, B41J 1142

Patent

active

051921510

ABSTRACT:
A printer including a print head; a paper path for a document to be printed; and a document transfer device. The document transfer device is arranged in connection with the paper path and provided with parallel drive pulleys (6) gripping the underside of the document and positioned on at least two sequential shafts (5) and with spring-actuated pressure rollers (9) pressing the document from above against the drive pulleys, at least a part of the pressure rollers being provided with drive and the rollers being arranged in parallel, like the drive pulleys, and disposed sequentially above the drive pulleys to form pairs of drive pulleys and pressure rollers. The printer also includes a stop device positioned on the paper path for straightening the document. Two springs (14, 16) pressing a pressure roller downwards against a drive pulley are arranged in connection with a support mechanism of each pressure roller (9) of the first row of pressure rollers, the stiffness of the first spring (14) being substantially stronger than the stiffness of the second spring (16). In addition, a lifting mechanism (17, 18) is provided, by the aid of which the stiffer spring (14) can be released, in which case only the weaker second spring (16) influences the pressure roller and presses it downwards.

REFERENCES:
patent: 3240487 (1966-03-01), Templeton
patent: 4743129 (1988-05-01), Keryhuel et al.
patent: 4878772 (1989-11-01), Fukumoto et al.

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