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US 5,007,749 AGranted
Cartridge including tension means for a typewriter correction ribbon
AssigneeIng. C. Olivetti & C., S.p.A.
InventorsRemo Falconieri, Sergio Uggetti
Life of this patent
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AssigneeIng. C. Olivetti & C., S.p.A.
InventorsRemo Falconieri, Sergio Uggetti
Estimating the term…
A cartridge for a correction ribbon for typewriters comprises a container for a supply reel and a receiving reel. A tensioning device comprises a toothed ring on the supply rell and a spring which is pivoted in the container and which has one end engaged with the toothed ring to tension the ribbon. The container can be removably fixed to the lower part of a cartridge for a typing ribbon which in turn can be fitted on a support of the machine. The support is movable from a viewing position to a typing position in which the typing ribbon is in front of the point of typing and to a correction position in which the correction ribbon is in front of the point of typing. The receiving reel of the cartridge, in use, is capable of co-operating with a feed mechanism which provides for forward feed movement of the ribbon in each correction cycle. For that purpose the receiving reel comprises a series of frontal teeth provided in the lower part of its flange, the container comprises an opening and the feed mechanism comprises a ratchet co-operating with the frontal teeth through the opening for a forward feed cycle of the correction ribbon when the support moves between the viewing position and the correction position.
A cartridge for a correction ribbon for typewriters, comprising a container accommodating a supply reel on which said correction ribbon is initially wound and a receiving reel on which said correction ribbon is rewound after having been used, said receiving reel co-operating with a feed mechanism of said typewriter to produce a unidirectional feed movement of said ribbon in each correction cycle and a tensioning device for said supply reel for tensioning said ribbon in opposition to said feed movement said feed mechanism, said tensioning device comprising a toothed ring having a series of peripheral teeth integral with said supply reel, and a spring element having a fixed part bearing against said container and a yielding part having an end engaged with said teeth of said toothed ring to urge said supply reel in a direction opposite to said feed movement of said correction ribbon for tensioning said ribbon, and in which said end of said spring element of being intermittently disengaged from said teeth during said feed movement of said ribbon and being held in engagement with one of said teeth for a given operating travel during which the end of said spring element applies said tensioning action to said supply reel.
A cartridge for a correction ribbon for typewriters, comprising a container accommodating a supply reel on which said correction ribbon is initially wound and a receiving reel on which the correction ribbon is rewound after having been used, said container being removably fixed on a lower part of cartridge for a typing ribbon which in turn can be mounted on a support of said typewriter which is movable selectively from a viewing position, in which a point of typing is visible, to a typing position in which said typing ribbon is in front of said point of typing and a correction position in which said correction ribbon is in front of said point of typing, said receiving reel being actuated by a feed mechanism of said typewriter responsive to a displacement of said support about said correction position to produce unidirectional feed movement of said correction ribbon in each correction cycle, said cartridge for the correction ribbon comprising a series of frontal teeth provided in a lower part of a flange of said receiving reel and an opening in a bottom of said container in alignment with a given part of said series of frontal teeth and in which said cartridge for the correction ribbon can be used in machines in which said feed mechanism comprises a ratchet pivoted on a fixed support and having a terminal tooth capable of cooperating with said frontal teeth through said opening in said bottom of said container, and a spring element which applies a thrust force to said ratchet in a direction towards said flange, said thrust force being resisted by movement for mounting of said cartridge for the correction ribbon on said movable support of said typewriter.
Dependencies are inferred from the claim text.