Typewriting machines – Including type-set-assemblage mounted on carrier and... – Including type-faces movable relative to type-face-carrier
Patent
1983-10-14
1985-09-17
Burr, Edgar S.
Typewriting machines
Including type-set-assemblage mounted on carrier and...
Including type-faces movable relative to type-face-carrier
4001544, B41J 776, B41J 784
Patent
active
045417466
ABSTRACT:
An LED/photodetector structure is disclosed positioned to cooperate with a daisy wheel print element of a daisy wheel printer and a light interrupter such that under microprocessor control, a stepping motor will rotate and home the daisy wheel print element, sense the escapement pitch corresponding to that element, sense the font weight or impact force level associated with that print element and then cause the carrier to be translated to the left frame, thereby engaging the light beam interrupter with the left frame and forcing it into the light beam indicating the presence or the carrier at a known spacial position for homing of the carrier position.
The data carried by the print element in the form of apertures formed in the hub thereof and are all spacially positioned within one semicircular portion of the print element hub.
REFERENCES:
patent: 3574326 (1971-04-01), Koehn
patent: 3858509 (1975-01-01), Grundherr
patent: 4074798 (1978-02-01), Berger
Xerox Disc. Journal, "An Arrangement for Encoding Impact Energy . . . ", Sohl, vol. 1, Nos. 9/10, Sep./Oct. 1976, p. 25.
Xerox Disc. Journal, "Print Wheel Sensing Scheme", Cocksedge et al., vol. 4, No. 3, May/Jun. 1979, p. 415.
IBM Tech. Disc. Bulletin, "Single Sensor for Carrier Homing . . . ", Quinn, vol. 25, No. 11A, Apr. 1983, pp. 5818-5819.
IBM Technical Disclosure Bulletin, vol. 24, No. 1A, Jun. 1981, entitled "Pitch Sensing Device" by S. A. Okcuoglu et al., pp. 146-147.
Bobart Kevin L.
Samson Robert S.
Shakib Iraj D.
Burr Edgar S.
International Business Machines - Corporation
Letson Laurence R.
McDaniel James R.
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