Typewriting machines – Including adjustment for optimum printing plane – Responsive to thickness of record-medium
Patent
1991-03-04
1992-04-28
Eickholt, Eugene H.
Typewriting machines
Including adjustment for optimum printing plane
Responsive to thickness of record-medium
400656, 400703, B41J 1120
Patent
active
051082055
ABSTRACT:
A paper gap adjustment mechanism having two coaxially mounted cams which have a camming surface with a linear transition area for forms thickness adjustment and an adjacent ramp area for moving the platen open position plus a straight radius area at the top of the ramp area. A lever is attached to the cams for both controlling forms thickness and platen gap open but the printer operator actuates this lever itself only when controlling the forms thickness positions. A second lever is rotatable on the cam shaft also. The second lever is provided with detent means engageable by the first lever so that rotation of the second lever rotates the first lever and the cams from the set position of the first lever to the open position. The detent means has multiple set positions at which the first lever is engaged when the first lever is rotated to set thicknesses. Rotation of the second lever from the open position to closed position automatically returns the first lever to the prior set position. The invention also provides means operated by the first lever for indicating the paper thickness setting of the first lever. Means is also provided for detecting when the first lever has rotated to its open position.
REFERENCES:
patent: 3155032 (1964-11-01), Antonucci
patent: 4248146 (1981-02-01), Miyasaka et al.
patent: 4773772 (1988-09-01), Hanna et al.
patent: 4932797 (1990-06-01), Emenaker et al.
patent: 4990004 (1991-02-01), Kawahara et al.
"Printer Mechanisms", IBM Tech. Disclosure Bulletin, vol. 22, No. 8B, Jan. 1980, pp. 3525-3526.
Eickholt Eugene H.
Gasper John S.
International Business Machines Corp.
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