Browse Prior Art Database

Apparatus for Generating Timing Signal for a Belt Type Copier

IP.com Disclosure Number: IPCOM000050628D
Original Publication Date: 1982-Nov-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 3 page(s) / 57K

Publishing Venue

IBM

Related People

Klein, RD: AUTHOR [+2]

Abstract

U.S. Patent 4,025,186 describes a belt-type electrophotographic copier wherein two tracks of indicia are disposed along one edge of the belt. One of the tracks is a low frequency track which is utilized to identify the panel wherein images are placed. The other track is a high frequency track which is utilized to generate electrical signals for activating the processing station which performs on the image area of the belt.

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Apparatus for Generating Timing Signal for a Belt Type Copier

U.S. Patent 4,025,186 describes a belt-type electrophotographic copier wherein two tracks of indicia are disposed along one edge of the belt. One of the tracks is a low frequency track which is utilized to identify the panel wherein images are placed. The other track is a high frequency track which is utilized to generate electrical signals for activating the processing station which performs on the image area of the belt.

This article describes a belt-type electrophotographic copier wherein a single track of indicia is utilized to identify image panels and to generate electrical signals for activating stations which perform on the image area of the belt. The indicia on the common track which is utilized to identify the image panels has a larger area than the indicia used to activate the processing stations.

Fig. 1 shows the photoconductor 10 with a single timing track disposed on one edge of the photoconductor. The timing track includes a plurality of high frequency indicia 12 and a plurality of low frequency indicia 14. The wider indicia is used to identify the panel areas where an image is to be placed on the photoconductor, while the high frequency mark generates the signal which is used to activate the various processing stations which operate within the image area of the photoconductor. A single sensor is used to produce a pulse having a width proportional to the width of each mark on the belt. The machine control logic (either software or hardware) samples the sensor output at a high frequency (relative to the pulse) to perform a pulse-width measurement on each pulse. The control logic then determines whether the sensed mark is a short timing mark or a longer image panel mark based upon the resulting pulse width measurement. The panel marking signal is utilized by the system to determine where the image goes while the high frequency timing mark is utilized by the system to activate the necessary processing station.

Fig. 2 shows a block diagram of a hardware implementation of the detection circuitry. Fig. 3 shows the waveforms which are generated by Fig. 2 at various sections of the circuitry. The sensor package 70 (Fig. 2) is mounted relative to the single track of indicia shown on the photoconductor of Fig. 1.

The analog signal which is generated from the sensor is shaped into a square signal 110 by squaring circuit 10. The square sign...