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Forms Tension Mechanism

IP.com Disclosure Number: IPCOM000061489D
Original Publication Date: 1986-Aug-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Kluvo, KG: AUTHOR [+3]

Abstract

A forms tension mechanism, as shown in Fig. 1, has a drag finger assembly 1 which is rotatably mounted around a shaft 2 to press against the drag bar 3. This tension mechanism applies a drag force to the forms as they are pulled across the platen by a pair of form feed tractors or the like. Referring to the figures, the drag finger assembly is generally L-shaped in cross-section and is rotatably mounted to pivot around locating shaft 2. A plurality of parallel, upstanding fingers 5 extend upwardly from the base of the drag finger assembly like the teeth of a comb. A resilient member forms a triangular spring 6 having one end attached to the drag finger assembly and the other end in contact with cam 7. The location shaft may be held by a pair of frames 8. The drag bar 3 may also be positioned in the frames 8.

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Forms Tension Mechanism

A forms tension mechanism, as shown in Fig. 1, has a drag finger assembly 1 which is rotatably mounted around a shaft 2 to press against the drag bar 3. This tension mechanism applies a drag force to the forms as they are pulled across the platen by a pair of form feed tractors or the like. Referring to the figures, the drag finger assembly is generally L-shaped in cross-section and is rotatably mounted to pivot around locating shaft 2. A plurality of parallel, upstanding fingers 5 extend upwardly from the base of the drag finger assembly like the teeth of a comb. A resilient member forms a triangular spring 6 having one end attached to the drag finger assembly and the other end in contact with cam 7. The location shaft may be held by a pair of frames 8. The drag bar 3 may also be positioned in the frames 8. The fingers 5 press against the drag bar with a force dependent upon the position of the cam 7 which, in combination with triangular spring 6, urges the fingers 5, in unison, against the drag bar to sandwich the forms along the dotted line paper path P, as illustrated. The force applied by the cam and triangular spring urges the fingers against the drag bar and applies an even load against the forms to be printed. This design balances the forces applied to the left side of tensioning mechanism against the forces applied to the right side so that a constant load will be distributed across the width of the mechanism which is independent...