Ink ribbon cassette for printer
US4449838A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 28, 1982 |
| Grant date | May 22, 1984 |
| Priority date | — |
| Expiry date | Jul 28, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J35/08
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An ink ribbon cassette for impact type printers comprises an ink roller of plastic sponge impregnated with ink and an endless type ink ribbon contacting with the ink roller. The ink ribbon is provided with a proper tension by a leaf spring member. At the time of assembly, the pressure of the leaf spring on the ribbon is not yet impressed. After the setting of ribbon, the bow-shaped leaf spring is reversed to opposite side in a snap action, being pushed from the outside, thereby to impress the tension. In another example, when the ink volume impregnated in the ink ribbon decreases after long use of the cassette, pressure is applied to the ink roller by the spring member, by changing the side of it bow part and squeezing ink to transfer to the ink ribbon, thereby prolonging the service time of the ink ribbon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.