Browse Prior Art Database

Out of Sequence Sheet Feeding Detector

IP.com Disclosure Number: IPCOM000093211D
Original Publication Date: 1967-Jul-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 3 page(s) / 50K

Publishing Venue

IBM

Related People

Markovics, JA: AUTHOR

Abstract

The circuit detects the out-of-sequence feeding of printed sheets from a plurality of feed hoppers 1...4. The sheets are arranged in an ordered manner within each hopper, and from hopper to hopper.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 53% of the total text.

Page 1 of 3

Out of Sequence Sheet Feeding Detector

The circuit detects the out-of-sequence feeding of printed sheets from a plurality of feed hoppers 1...4. The sheets are arranged in an ordered manner within each hopper, and from hopper to hopper.

A printed mark, located on the bottom face of every other printed sheet in each hopper, is used to identify proper ordering. Thus every sheet with a mark on its bottom face should be followed by an associated sheet in the hopper with no mark. Proper ordering of the sheet-stacks between the hoppers is when the sheet arrangement in any given hopper is out-of-phase with the sheet arrangement in each of its two adjacent hoppers. For instance, the sheets are stacked in hopper 2 so that the bottom sheet has a mark on it and each alternate sheet in that stack has a blank. Adjacent hoppers 1 and 3 have their sheets stacked so that the bottom sheets are blank and their alternate sheets are marked. Thus, if all the bottom sheets are sampled simultaneously at any given time, proper ordering of the hoppers is indicated by a marked sheet in hopper 1, a blank sheet in hopper 2, a marked sheet in hopper 3. and a blank sheet in hopper 4.

Alternatively, proper ordering is indicated by a blank sheet in hopper 1, a marked sheet in hopper 2, a blank sheet in hopper 3, and a marked sheet in hopper 4. The same hopper-to-hopper arrangement holds when a greater number of hoppers is used. Any other combination of marked and blank sheets is an out-of-sequence condition and feeding of sheets must be stopped for corrective action.

Picker arm 21 beneath each feed hopper is vacuum operated. All arms 21 are mechanically linked together to operate simultaneously in an oscillating motion. Arms 21 pick one sheet at a time from the bottom of each stack and feed the sheets into feed rolls 44 for delivery to receiving trays 22, simultaneously for all hopper stations. A mark sensor MS is located beneath each hopper stack and senses the presence or absence of the printed mark on the exposed bottom sheet. Sampling the output of the MS's is timed by picker sync circuit 24. The latter is mechanically synchronized by the motion of arms 21 to provide an output timing pulse just before the sheets are picked from the bottom of stacks.

Each MS provides a pair of complementary outp...