Drum clamping mechanism for a printer

Details Drum clamping mechanism for a printer Drum clamping mechanism for a printer

1985-08-13

1986-12-09

Crowder, Clifford D.

Typewriting machines

Platen or platen-moving mechanism

For movement of platen other than for line-spacing

4005272, 400659, 101409, B41F 2104, B41J 1104

Patent

active

046277544

ABSTRACT:
A mechanism for clamping the leading edge of a sheet to be wrapped around a printing drum for printing in a plurality of colors includes a clip that is movably mounted in the drum so that it can be moved between an open position and a clamping position, the clip being biased to its clamping position. One or more deflectable cams are positioned adjacent to the drum for engagement by the clip. When the drum is rotated in its direction for printing successive colors on the sheet, the clip deflects the cam and remains in its clamping position. However, when the drum is rotated in the opposite direction to discharge a printed sheet, the clip is engaged by the cams and wedged thereby to its open position thereby releasing the printed sheet. The mechanism also includes provision for automatically discharging the printed sheet from the drum to a discharge path adjacent to the drum when the clip is opened.

REFERENCES:
patent: 1508951 (1924-09-01), Baker
patent: 2056922 (1936-10-01), Gegenheimer
patent: 2865289 (1958-12-01), Fowlie et al.
patent: 3221652 (1965-12-01), Mestre
patent: 4388628 (1983-06-01), Moriguchi et al.
patent: 4543004 (1985-09-01), Brandenburg et al.
Barber, Jr. et al., "Mechanism and Actuator for Clamping Sheets on a Drum", IBM Technical Disclosure Bulletin, vol. 23, No. 7A, Dec. 1980, pp. 2679-2682.

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