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Journal Roll Drive Mechanism

IP.com Disclosure Number: IPCOM000076029D
Original Publication Date: 1971-Dec-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Matuck, GC: AUTHOR [+2]

Abstract

Described is a mechanism which can be used for varying the drive of a take-up roll and thereby compensate for increasing diameter of the roll as paper is added to the roll. Illustrated is a braking mechanism which is responsive to the increasing diameter of the take-up roll as paper is wound on the roll. A bellcrank pivotly arranged in contact with the paper roll senses the diameter of the paper roll and pivots about its pivot point as the paper roll increases in diameter. The bellcrank is displaced clockwise about the pivot point; thus, taking up the brake spring wound around the brake drum. As this spring is moved off of the drum, it limits the angular throw of the magnet armature which is connected to the other end of the spring.

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Journal Roll Drive Mechanism

Described is a mechanism which can be used for varying the drive of a take- up roll and thereby compensate for increasing diameter of the roll as paper is added to the roll. Illustrated is a braking mechanism which is responsive to the increasing diameter of the take-up roll as paper is wound on the roll. A bellcrank pivotly arranged in contact with the paper roll senses the diameter of the paper roll and pivots about its pivot point as the paper roll increases in diameter. The bellcrank is displaced clockwise about the pivot point; thus, taking up the brake spring wound around the brake drum. As this spring is moved off of the drum, it limits the angular throw of the magnet armature which is connected to the other end of the spring. Thus when the magnet is pulsed, the armature throw is restricted by the brake spring as a function of the angular displacement of the bellcrank which is dependent on the diameter of the paper roll. As the roll increases the diameter, the throw of the magnet armature decreases; thus moving a fixed amount of paper onto the take-up roll which is independent of the diameter of the take-up roll itself.

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