Method and apparatus for feeding documents with variable driving force
CA 1100538 A · Owner: Ibm Canada Limited - Ibm Canada Limitee · Inventors: Henderson, Peter J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, To feed sheet material such as punched cards copy sheets and the, like along a given feed path the driving force applied to the material is altered in dependence upon the specific driving force requirements at any given portion of the feed path. Where a pair of feed rollers are used, (a drive roller and or idler roller) the driving force is, varied by selectively varying the nip pressure between the rollers. Control of nip pressure can be effected by electro-magnetic means operatively connected one or other of the idler and drive rollers. CA9-79-001
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted May 5, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 5, 1998.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.