Print medium advancing mechanism including print head retraction

Details Print medium advancing mechanism including print head retraction Print medium advancing mechanism including print head retraction

1982-08-02

1984-04-24

Wright, Jr., Ernest T.

Typewriting machines

Typing by other than type-face or type-die

Thermal

400320, 400568, 400569, 400636, 400902, 400903, 400904, 400185, 346 76PH, 346136, B41J 320

Patent

active

044445210

ABSTRACT:
A single stepper motor is utilized in a printing device to lift a print head from the surface of recording material upon the initial angular rotation of the stepper motor output drive shaft and to move the recording material within the printing device upon further rotation of said drive shaft. The print head is returned to the surface of the recording material by operating the stepper motor in the reverse direction until the output drive shaft of the stepper motor traverses an angular displacement equal but opposite to the initial angular displacement. A cam surface couples the output drive shaft of the stepper motor to a drive gear and transforms the initial angular displacement of the output drive shaft into linear motion to lift the print head from the surface of the recording material. Further rotation of the stepper motor drive shaft rotates the drive gear to move material within the printing device. Cam configurations are disclosed for movement of the paper in one or both directions through the printing device.

REFERENCES:
patent: Re29832 (1978-11-01), Hayakawa
patent: 3787886 (1974-01-01), McCrady
patent: 3810192 (1974-05-01), Okabe
patent: 3845850 (1974-11-01), Herr et al.
patent: 3855448 (1974-12-01), Hanagata et al.
patent: 3951247 (1976-04-01), Montanari
patent: 3955663 (1976-05-01), Ecker
patent: 4013159 (1977-03-01), Okabe
patent: 4030587 (1977-06-01), Walker
patent: 4030588 (1977-06-01), Hanagata et al.
patent: 4173273 (1979-11-01), Hanakata
patent: 4350987 (1982-09-01), Hanagata et al.

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