B - Operations – Transporting – 41 – J
Patent
B - Operations, Transporting
41
J
197/106
B41J 32/00 (2006.01) B41J 33/52 (2006.01)
Patent
CA 2012545
A cassette for a printing ribbon for typewriters comprises a casing accommodating a supply spool, a receiving spool and a brake and take up device which operates on a tube of the supply spool and on the ribbon which is unwound from the supply spool. The tube is rotatable on a sleeve projecting from the bottom of the casing. The brake and take up device comprises a shoe for applying a braking action to an internal surface of the tube. A wire spring has an intermediate portion which engages in a seat of coupling means of the shoe. In a first position the shoe is urged against the surface of the tube and brakes the supply spool. In a second position the shoe is spaced from the internal surface of the tube and the supply spool is free to rotate. The spring also performs the slack ribbon take-up function and for that purpose comprises an end having an L-shaped bent portion which in turn is engaged with the ribbon to regulate the tension and unwinding of the ribbon which is unwound from the supply spool.
Cette invention concerne une cassette de ruban à imprimer pour machine à écrire. La cassette comprend un boîtier renfermant un dévidoir, un enrouleur et un dispositif de freinage et de reprise du mou qui agit sur un tube du dévidoir et sur le ruban déroulé. Le tube tourne sur un manchon faisant saillie du fond de la cassette. Le dispositif de freinage et de reprise du mou comprend un patin qui freine la rotation du tube en frottant contre sa paroi intérieure. Un fil ressort est en appui par sa partie intermédiaire sur un siège du moyen de montage du patin de freinage. Dans une première position, ce patin est plaqué contre la paroi intérieure du tube et freine le dévidoir. Dans une seconde position, il est en retrait de la paroi intérieure précitée et permet la libre rotation du dévidoir. Le ressort remplit également une fonction de reprise du mou et, à cette fin, comprend un bout replié en L sur lequel passe le ruban. Cette partie assure le réglage de la tension et du déroulement du ruban.
Ing. C. Olivetti & C. S.p.a.
Ridout & Maybee Llp
LandOfFree
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