Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Document Tracking System

IP.com Disclosure Number: IPCOM000074956D
Original Publication Date: 1971-Jul-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 3 page(s) / 34K

Publishing Venue

IBM

Related People

Duff, ML: AUTHOR [+3]

Abstract

The circuit arrangement shown constitutes a single stage or cell in a counter arrangement for document tracking in a document transport system. It can be shown that where documents must be tracked over long distances, it is advantageous to use counting or shift register arrangements rather than sequentially arranged timing circuits such as single shots, in order that any cumulative errors may be reduced or eliminated. The arrangement shown constitutes a single intermediate stage or cell in a series of stages or cells, sufficient to provide appropriate counts for the documents in a document transport.

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 52% of the total text.

Page 1 of 3

Document Tracking System

The circuit arrangement shown constitutes a single stage or cell in a counter arrangement for document tracking in a document transport system. It can be shown that where documents must be tracked over long distances, it is advantageous to use counting or shift register arrangements rather than sequentially arranged timing circuits such as single shots, in order that any cumulative errors may be reduced or eliminated. The arrangement shown constitutes a single intermediate stage or cell in a series of stages or cells, sufficient to provide appropriate counts for the documents in a document transport.

Driving pulses are provided by a suitable type of pulse generator connected to the document transport, which provides electrical pulses corresponding to increments of travel of the transport. In the present arrangement these pulses are supplied to a frequency divider, not shown, which halves the frequency, and the drive pulses are supplied to a first and second trigger T1 and T2, by a line designated as DRIVE/2. The triggers T1 and T2 are connected to provide a modified two-stage binary counter, which is stable in the 00 state. It ignores all the drive pulses supplied on the driving line until a START signal from the preceding cell, such as the signal START B, is provided on the line shown. Thereafter, the cell will count in the order 0 1, 1 1, 1 0, and 0 0. The carry signal to the next stage designated by the legend, START C, is generated on the third count corresponding to the condition,1 0 of the triggers T1 and T2 by combining the outputs, as shown, in an AND circuit 5. The next drive pulse will then advance the succeeding cell to 0 1 and advances the cell, such as cell B, to the state 0 0. The circuit is capable of bypassing the 0 0 or reset state if a new input is supplied to it at an appropriate time. The cell, of course, can be expanded by adding binary triggers as required and adding suitable additional inputs to the carry circuit.

An important feature of the present arrangement is the use of an additional trigger, CORR, which enables corrections to be made, depending upon w...