Browse Prior Art Database

Paper Metering and Registration

IP.com Disclosure Number: IPCOM000078453D
Original Publication Date: 1973-Jan-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Fitch, EL: AUTHOR [+2]

Abstract

In certain copier systems copy paper delivered from a supply roll, is cut into sheets of various discrete lengths in the course of the copying process. The ability to select a wide variety of lengths enables the system user to conserve paper, by tailoring the copy sheet length to the size of the copied image.

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Paper Metering and Registration

In certain copier systems copy paper delivered from a supply roll, is cut into sheets of various discrete lengths in the course of the copying process. The ability to select a wide variety of lengths enables the system user to conserve paper, by tailoring the copy sheet length to the size of the copied image.

As indicated in the drawing, the desired ability to select cutting lengths over a wide range of choices is achieved by mechanically coupling the copy paper feed rolls through gearing 1 and magnetic clutch 3 to drum Shaft 5, which drives the electrographic copy drum. Clutch 3 is selectively engaged and disengaged during the copying (drum rotation) cycle, to feed the paper into copying contact with the drum. Disc 7, which is coupled through gears to the drum drive shaft 5 contains slots 9. These provide for intermittent communication between light source 11 and photocell 15, at increments of disc rotation corresponding to quarter inch movements of the copy paper. Selected pulse outputs of photocell 15 are used to control disengagement of the clutch and cutting of copy paper at the knife location (e.g., after counting of a selected number of photocell pulses). Thus, the paper may be cut (e.g., by operation of a solenoid controlling the cutting knife) to lengths which are arbitrary integer multiples of a quarter inch. This incremental feed could be made finer by adding more slots in the timing disc.

Photocell 17 and light 19 are u...