Reversible ribbon drive mechanism

Details Reversible ribbon drive mechanism Reversible ribbon drive mechanism

1976-04-08

1977-04-26

Wright, Jr., Ernest T.

Textiles: fiber preparation

B41J 3344

Patent

active

040196186

ABSTRACT:
A diameter sensing, reversible ribbon drive mechanism including disabling cams pivotal about the axes of the ribbon spools for disabling the drive and detent pawls for one spool and enabling similar pawls for the other spool. A first link connecting the drive pawls is oscillated during each printing cycle. A second link connecting the disabling cams carries a coupler which is moved into one coupling relation with the first link by a diameter sensing device which senses a depleted condition of one of the spools to cause the first link to transfer movement to the second link to reverse the conditions of the drive and detent previously enabled pawls.

REFERENCES:
patent: 675659 (1901-06-01), Kimball
patent: 1522874 (1925-01-01), Ekman
patent: 1544891 (1925-07-01), Crook
patent: 1578209 (1926-03-01), Rosien
patent: 1971568 (1934-08-01), Kranz
patent: 2126347 (1938-08-01), Ruttiman
patent: 3602353 (1971-08-01), Chvatlinsky et al.

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