发明名称 |
CASSETTE FOR A PRINTING RIBBON FOR TYPEWRITERS |
摘要 |
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.
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申请公布号 |
US5085531(A) |
申请公布日期 |
1992.02.04 |
申请号 |
US19900492807 |
申请日期 |
1990.03.18 |
申请人 |
ING. C. OLIVETTI & C., S.P.A. |
发明人 |
GILLIO, CLAUDIO |
分类号 |
B41J32/00;B41J33/52;B41J35/28 |
主分类号 |
B41J32/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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