Browse Prior Art Database

Multi Function Restraining Knife

IP.com Disclosure Number: IPCOM000051898D
Original Publication Date: 1981-Mar-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Yanker, GM: AUTHOR

Abstract

It is known in the paper-handling art to shingle a stack of sheets in a first direction to remove the uppermost sheet from the control of the restraining knife and to then reverse the direction of the shingler or other picker/separator to feed the released sheet to a printer or the like. It has been customary to have a trailing edge detector or sensing means located at the opposite end of the stack from the restraining knife. While the position of the sensor may be adjustable, for a given stack it is usually fixed, requiring that all sheets in the stack be the same length. What is shown and described here is a leading edge sensor which enables sheets of varying lengths to be interspersed in the same stack.

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Multi Function Restraining Knife

It is known in the paper-handling art to shingle a stack of sheets in a first direction to remove the uppermost sheet from the control of the restraining knife and to then reverse the direction of the shingler or other picker/separator to feed the released sheet to a printer or the like. It has been customary to have a trailing edge detector or sensing means located at the opposite end of the stack from the restraining knife. While the position of the sensor may be adjustable, for a given stack it is usually fixed, requiring that all sheets in the stack be the same length. What is shown and described here is a leading edge sensor which enables sheets of varying lengths to be interspersed in the same stack.

In Fig. 1, the stack of sheets 1 is shingled in the direction of arrow 3. The topmost sheet 5 has been released from control of restraining knife 7. Restraining knife 7 includes an inlaid photocell 9 for interaction with light source
11. Knife 7 oscillates in the direction of arrows 13. In Fig. 2, knife 7 is shown at the high end of its stroke after the first sheet 5 is beginning its travel toward the print station in the direction of arrow 15. Conventional logic is used to determine when the photocell 9 is covered. That signal is used to stop the shingling operation in the direction of arrow 3 and to commence the feed operation in the direction of arrow 15.

The advantages accruing from the use of oscillating knife 7 are:

1. She...