Web feed mechanism for feeding a web from a roll

Details Web feed mechanism for feeding a web from a roll Web feed mechanism for feeding a web from a roll

1984-10-23

1986-02-18

Levy, Stuart S.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

2421561, G11B 1522, B65H 2306

Patent

active

045708703

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.

REFERENCES:
patent: 1379164 (1921-05-01), Bullis
patent: 1987141 (1935-01-01), Casper
patent: 3243137 (1966-03-01), Norman

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