Typewriting machines – Sheet or web – Including friction-feed means
Patent
1986-10-27
1987-08-25
Burr, Edgar S.
Typewriting machines
Sheet or web
Including friction-feed means
4006371, B41J 13036
Patent
active
046889582
ABSTRACT:
Disclosed is a paper feeding mechanism for a printer which comprises: a pinch roller urged against a platen; a platen bearing for rotatably supporting the platen; a cam portion formed on the platen bearing; a paper pressing lever for supporting a paper pressing roller; a connecting lever for driving the paper pressing lever in response to rotation of the cam portion; a cam follower lever fixed on a rotatable support shaft and provided with a cam follower engageable with a cam surface of the cam portion; a support arm fixed on the support shaft so as to be displaced in response to rotation of the support shaft; a roller receiver for bearing the pinch roller at one end portion of the roller receiver; connecting means for rotatably movably connecting a tip end portion of the support arm and the other end of the roller receiver; a tension spring stretched between the support arm and the roller receiver; and a protrusion and a protrusion receiver provided on one and the other of the support arm and the roller receiver respectively, the protrusion and the protrusion receiver being disposed at a position slightly separated from a line of action of spring force of the tension spring toward the connecting means. The cam surface of the cam portion includes a first, a second and a third positioning cam surface portion different in radius from each other, the first, second and third positioning cam surface portions being selectively followed by the cam follower for displacing the cam follower lever into selected one of three swung positions. The cam surface further includes a switch pressing cam surface portion for turning on/off a switch of a paper feeding motor.
REFERENCES:
patent: 1988189 (1935-01-01), Dobson
patent: 4641830 (1987-02-01), Okuda et al.
Adams Bruce L.
Burr Edgar S.
Lisehora James
Seikosha Co. Ltd.
Wilks Van C.
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