Typewriting machines – For line-spacing by incremental rotation of platen – By electric-power drive
Patent
1978-06-02
1980-12-30
Wright, Jr., Ernest T.
Typewriting machines
For line-spacing by incremental rotation of platen
By electric-power drive
4005752, 4006161, 400619, B41J 1976
Patent
active
042420067
ABSTRACT:
The present invention is an improved media advancement mechanism for use in combination with a printer that includes a frame, a print head mechanically coupled to the frame and a platen mechanically coupled to the frame so that a print media may pass between it and the print head. The printer also includes a pair of sprockets which are adapted to support the print media and which are mechanically coupled to the frame by a sprocket shaft. The improved media advancement mechanism includes a ratchet wheel which is mechanically coupled to the sprocket shaft in order to provide rotational motion thereto in response to an electrical signal from the printer thereby moving the print media incrementally. The improved media advancement mechanism also includes an adjustment plate pivotally coupled to a sidewall of the frame and a restraining device for restraining the adjustment plate from its pivotal motion. The improved media advancement mechanism further includes a solenoid with an armature which receives an electrical signal from the printer and which is mechanically coupled to and disposed on the surface of the adjustment plate, a pawl which is mechanically coupled to the armature of the solenoid and which is disposed so that it can mechanically engage the teeth of the ratchet wheel in order to impart rotational motion thereto and a spring which mechanically couples the pawl to the adjustment plate.
REFERENCES:
patent: 1481110 (1924-01-01), Pond
patent: 2056393 (1936-10-01), Didzuns
patent: 2456734 (1948-12-01), Ritzert
patent: 3414106 (1968-12-01), Moran et al.
patent: 3730082 (1973-05-01), Perry
patent: 3986594 (1976-10-01), Kondur, Jr.
patent: 4004671 (1977-01-01), Kondur, Jr.
patent: 4062436 (1977-12-01), Kondur, Jr.
patent: 4070963 (1978-01-01), Weaver
C. Itoh Electronics, Inc.
Johansen W. Edward
Wright, Jr. Ernest T.
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