Browse Prior Art Database

Trailing Edge Restraint

IP.com Disclosure Number: IPCOM000086174D
Original Publication Date: 1976-Aug-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Sobey, PW: AUTHOR

Abstract

In moving paper past an ink jet printing station, it is essential that the trailing edge of the printed document must not contact the ink jet printer fog collector. Also, any pinch rollers should be far enough below the fog zone so that the roller shafts do not accumulate enough ink to track on the document.

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Trailing Edge Restraint

In moving paper past an ink jet printing station, it is essential that the trailing edge of the printed document must not contact the ink jet printer fog collector. Also, any pinch rollers should be far enough below the fog zone so that the roller shafts do not accumulate enough ink to track on the document.

The mechanism illustrated eliminates any problem in these two areas while not causing any decrease in machine throughput. The spring loaded rollers used to index the document are all mounted on a common bar. Leaf springs are wide feeler gauge stock areas. The rollers are connected to the leaf springs with a punch stock shaft. The roller bar connecting all of the springs is attached to the print drum at its left and right ends. The roller bar is free to rotate about the print drum shaft on two bearings.

The roller bar is spring loaded to a home position. When the document is being printed the rollers rest 19 degrees below the horizontal center line of the print drum. This is outside of the heavy fog zone created by the printer. A microswitch, not shown, located inside the diameter of the print drum senses the trailing edge of the document. A signal from the microswitch activates a magnet, not shown, attached to the end of the roller bar. The top of the magnet armature detents into a ratchet, not shown, that is attached to the print drum shaft and allows the pinch rollers to follow the displacement of the print drum. The pinch rollers be...