Abstract The specification describes a holdback device for controlling the flow of a web of paper in a high-speed line printer. The device prevents reverse movement of the web, for example when being printed upon, and allows forward movement of it. The backward movement - caused by the web being gripped between the rotating character shaft and the printing hammers - results in the misalignment of printed characters, and may even cause damage to the web. The devices described have a blade or pawl movably mounted in contact with the paper web, and pivotally bearing on a fixed surface. If reverse movement starts to take place the blade or pawl pivots on the fixed surface and grips the web between it and a drum contacting the other side of the web. The drum is free to move only in a sense such as to move the web in the forward direction and it is driven in this sense simultaneously with or immediately prior to movement of the web in the forward direction - when the printing of a line of characters has been completed thus aiding the unlocking of the blade or pawl.
Inventors
👤 Ronald John Frank Eitel
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-27 07:57
CPC Classifications
B; B41; B41J; B41J15/00; B41J15/16
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
194 words
Paper-feeding apparatus including a planar bad for supporting a web of paper to be fed; means for feeding the web in one direction along the bed having a gap therein extending transverse to said one direction; a roller having an axis of rotation mounted in the gap with said axis extending parallel to said planar bed and transversely to said one direction such that a part of the surface of the roller lies in the plane of the bed; a member resiliently mounted relative to said roller such that the web may be fed freely between the member and the roller in said one direction and is gripped between the member and the roller by a wedging action acting substantially along a line parallel to said axis of rotation as a result of movement of the web in a second direction opposite to said one direction; means for rotating the roller about its axis to move said part of the surface of the roller in said one direction to facilitate the release of the web from the wedging action when the web is moved in said one direction after movement in the second direction.
Claim 2
Dependent Claim
194 words
Paper-feeding apparatus including a planar bad for supporting a web of paper to be fed; means for feeding the web in one direction along the bed having a gap therein extending transverse to said one direction; a roller having an axis of rotation mounted in the gap with said axis extending parallel to said planar bed and transversely to said one direction such that a part of the surface of the roller lies in the plane of the bed; a member resiliently mounted relative to said roller such that the web may be fed freely between the member and the roller in said one direction and is gripped between the member and the roller by a wedging action acting substantially along a line parallel to said axis of rotation as a result of movement of the web in a second direction opposite to said one direction; means for rotating the roller about its axis to move said part of the surface of the roller in said one direction to facilitate the release of the web from the wedging action when the web is moved in said one direction after movement in the second direction.
Claim 3
Dependent Claim
44 words
Apparatus as claimed in Claim 1 wherein the rotating means is operative to rotate the roller intermittently, rotation of the roller being initiated immediately prior to feeding the web in said one direction and continued until the web is moving in said one direction.