Web feed mechanism for feeding a web from a roll
US4570870A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 23, 1984 |
| Grant date | Feb 18, 1986 |
| Priority date | — |
| Expiry date | Oct 23, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B15/67
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A web feed mechanism for stepwise or continuously feeding a web, such as a printing medium of a printer, or the like, from a roll of web. In the web feed mechanism, slackness, if any, can be absorbed by applying a drag force to the outermost winding of the web roll through a radially inwardly biased sliding member that slides tangentially of the web roll either in the forward direction, in which the web is to be let off from the web roll, or in the backward direction, in which the web is to be taken up onto the web roll. The sliding member is spring biased to slide backward. Upon the web being let off the web roll, the drag slides the sliding member forward, charges its spring and thereby keeps the web under tension. Upon discontinuance of web unwinding, slackness in the web is absorbed by the spring biasing the sliding member to drag the web roll to roll backward.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.