EP 0013293 B1 19830413 - PRINTER RIBBON SUPPLY MECHANISM WITH END-OF-RIBBON DETECTION
Title (en)
PRINTER RIBBON SUPPLY MECHANISM WITH END-OF-RIBBON DETECTION
Publication
Application
Priority
US 95821278 A 19781106
Abstract (en)
[origin: US4213575A] In a conventional ribbon supply spool structure which comprises a supply of ribbon wound on a hub rotatable about and axially movable with respect to a hub receiving member on which the hub is seated and which is coaxial with respect to the hub, an improved end of ribbon detection device is provided by the combination of deflectable spring means within the spool hub which exert a force when deflected having a first force component acting against but restrained by wound ribbon on the hub and a second component acting along the hub axis. A spring tensioned member exerts a force along the hub axis which opposes the component of force of the deflectable spring along the hub axis. In this manner, the deflectable spring and the spring tensioned member are maintained in static equilibrium at a selected point along said axis so long as the deflectable spring is restrained by a predetermined minimum of ribbon remaining wound on the hub. This predetermimned minimum of ribbon remaining wound is indicative of the end of ribbon. In the preferred embodiment this is in effect the point where the ribbon becomes substantially unwound.
IPC 1-7
IPC 8 full level
B65H 23/182 (2006.01); B41J 33/52 (2006.01); B41J 33/54 (2006.01); B41J 35/36 (2006.01)
CPC (source: EP US)
B41J 35/36 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0013293 A2 19800723; EP 0013293 A3 19801112; EP 0013293 B1 19830413; CA 1117889 A 19820209; DE 2965206 D1 19830519; IT 1162787 B 19870401; IT 7926804 A0 19791026; JP S5581184 A 19800618; JP S5916940 B2 19840418; US 4213575 A 19800722
DOCDB simple family (application)
EP 79103705 A 19790928; CA 336006 A 19790920; DE 2965206 T 19790928; IT 2680479 A 19791026; JP 10416379 A 19790817; US 95821278 A 19781106