US 4,565,128 AGranted

Rotary wheel printer

AssigneeAlps Electric Co., Ltd.

InventorsNaoki Moriyama, Hiroshi Koike, Osamu Hatakeyama

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Abstract

A rotary wheel printer such as a daisy wheel printer includes a rotatable platen for receiving a paper sheet partially therearound, a carriage movable along the platen, and a type wheel mounted on the carriage in confronting relation to the platen and having a plurality of type fonts. The type wheel is inclined with respect to a horizontal plane, and first drive means are mounted on the carriage and inclined with respect to the horizontal plane for driving the type wheel to rotate about is own axis. Hammer means are also mounted on the carriage for pressing the type fonts and second drive means are mounted on the carriage for driving the hammer means. A ribbon cassette is mounted on the carriage and accommodates an ink ribbon, the ribbon cassette having slanted surfaces at a front portion thereof in which the ink ribbon is exposed adjacent to the print wheel. The slanted surfaces are inclined at the same angle as the type wheel, and the ribbon feeder means for successively feeding the ink ribbon are accommodated in the ribbon cassette. Third drive means are mounted on the carriage for driving the feeder means.

A rotary wheel printer comprising:

(a) a rotatable platen adapted to receive a paper sheet wound partially therearound;
(b) a carriage movable along said platen;
(c) a type wheel mounted on said carriage in confronting relation to said platen and having a plurality of type fonts, said type wheel being inclined with respect to the horizontal plane;
(d) first drive means mounted on said carriage and inclined with respect to the horizontal plane for driving said type wheel to rotate about its own axis to bring a selected font into a printing position;
(e) hammer means mounted on said carriage for pressing the type font held in said printing position one at a time against said platen;
(f) second drive means including a solenoid mounted on said carriage for driving said hammer means, said hammer means having a hammer lever interconnecting said hammer means and said solenoid and including an engagement portion at one end thereof, said solenoid having a drive shaft including a smaller-diameter neck portion sandwiched by said engagement portion;
(g) a ribbon cassette mounted on said carriage and accomodating an ink ribbon, said ribbon cassette having means including forward arm portions having slanted surfaces inclined at the same angle as said type wheel for extending the ribbon thereacross;
(h) ribbon feeder means for successively feeding said ink ribbon accomodated in said ribbon cassette in one direction;
and
(i) third drive means mounted on said carriage for driving said ribbon feeder means,
wherein said engagement portion comprises a pair of annular portions confronting each other with a clearance gap defined therebetween and having free ends, respectively, said smaller-diameter neck portion of said drive shaft being inserted in said clearance gap and sandwiched between said annular portions, said annular portions having other peripheral surfaces resiliently held against end surfaces of said smaller-diameter neck portion.

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Abstract

Claims1