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Bidirectional Forms-Tensioning Feeding System

IP.com Disclosure Number: IPCOM000043754D
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Momot, ME: AUTHOR [+2]

Abstract

A technique is described whereby an operator-adjustable tensioning device is applied to forms being fed through a printer. Tensioning control is maintained regardless of which direction paper is fed, type of forms used and the effects of climatic conditions. In order to provide the proper control of paper as it is fed through the printing station of a high speed printer, the use of a longitudinal forms-tensioning device is applied to the forms-feeding mechanism. To obtain the proper tension, a slight overdrive ratio is applied to the paper drive rolls 1 in relation to the paper feed tractors 2. On-way (Sprag) clutches 3 and 4 are mounted on the paper drive roll shaft 5.

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Bidirectional Forms-Tensioning Feeding System

A technique is described whereby an operator-adjustable tensioning device is applied to forms being fed through a printer. Tensioning control is maintained regardless of which direction paper is fed, type of forms used and the effects of climatic conditions. In order to provide the proper control of paper as it is fed through the printing station of a high speed printer, the use of a longitudinal forms-tensioning device is applied to the forms-feeding mechanism. To obtain the proper tension, a slight overdrive ratio is applied to the paper drive rolls 1 in relation to the paper feed tractors 2. On-way (Sprag) clutches 3 and 4 are mounted on the paper drive roll shaft 5. In order to prevent damage to the forms from overdrive, a hysteresis clutch 6 is installed on the paper drive roll shaft 5 to effectively eliminate the overdrive to the paper rolls while maintaining tension or drag on the form. Torque characteristics of the hysteresis clutch 6 are controlled by adjusting the input voltage to the clutch. This enables different tensions to be applied to different forms to compensate for variables, such as form thickness, material and climatic condition changes. To provide for forms feeding in the reverse direction, the one-way clutch 3, which was used to drive the paper drive rolls 1 in the forward direction, is now disengaged. The drive is now controlled by the other one-way clutch 4 which is mounted on the same shaft b...