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Print Belt

IP.com Disclosure Number: IPCOM000081276D
Original Publication Date: 1974-May-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Williams, KB: AUTHOR

Abstract

The combination print and timing belt clamps the leading edge of an aligned document and pulls it past the print area. The document is carried by the clamp until it is completely out of the print area, with the trailing edge constrained to the print drum to facilitate printing on the entire sheet. The sheet is unclamped as the next sheet is being carried to the print area by the other clamp on the print belt. The two document clamps are located one-half of a belt revolution apart and are connected by a series of wide timing belts. Since the clamps extend continuously across the width of the paper path, the pulleys which drive the timing belts contain axial grooves which the clamps phase into.

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Print Belt

The combination print and timing belt clamps the leading edge of an aligned document and pulls it past the print area. The document is carried by the clamp until it is completely out of the print area, with the trailing edge constrained to the print drum to facilitate printing on the entire sheet. The sheet is unclamped as the next sheet is being carried to the print area by the other clamp on the print belt. The two document clamps are located one-half of a belt revolution apart and are connected by a series of wide timing belts. Since the clamps extend continuously across the width of the paper path, the pulleys which drive the timing belts contain axial grooves which the clamps phase into.

The axial distances between the pulleys which are located near the printer include cylinders, also containing clamp grooves, with an outside diameter a few thousandths of an inch larger than the wrapped belt outside diameter, and are chosen to allow an integer number of six lines per inch and 5.333 lines per inch indexes along the circumference of the paper. The clamps are spring loaded closed and are opened by the motion of the clamps driving the clamp ears by opening pins.

At the paper accepting locations, the opening pins are electromagnetically withdrawn after paper is inserted allowing the clamp to spring shut on the leading edge of the paper. At the unclamping position, stationary pins are used to open the clamp, with continued motion of the clamp causing th...