Jamming detection

Abstract

Abstract THIS SUPERVISORY DETECTION ARRANGEMENT FOR A DOCUMENT HANDLING SYSTEM PARTICULARLY PROVIDES FOR AN ALARM CONDITION WHENEVER DOCUMENTS ARE LOST FROM THE CONVEYING PATH AND WHEN THEY ARE JAMMED UP OR OTHERWISE ABNORMALLY DELAYED. A DOCUMENT PASSING IN FRONT OF A FIRST PHOTOCELL A THE ENTRANCE OF A DOCUMENT CONVEYOR PATH STARTS A SHIFT REGISTER SHIFTING A 1STATE THROUGH IT AT A MAIN CLOCK PULSE RATE. A NUMBER OF REGISTERING BISTABLE DEVICES CORRESPONDING WITH A SAME NUMBER OF PHOTOCELLS, PLACED ALONG THE CONVEYOR PATH ARE SET BY AN INTERMEDIATE CLOCK PULSE PHASE-SHIFTED WITH RESPECT TO THE MAIN CLOCK PULSE WHEN A CORRESPONDING SHIFT REGISTER STAGE IS SET. EACH REGISTERING BISTABLE DEVICE IS RESET BY A DOCUMENT PASSING IN FRONT OF A CORRESPONDING PHOTOCELL AND ITS CONDITION IS TESTED WHEN THE SAME OR ONE OF THE FOLLOWING SHIFT REGISTER BISTABLE DEVICES IS IN THE 1-STATE AND AT THE OCCURENCE OF A SECOND INTERMEDIATE CLOCK PULSE. ALARM CONDITIONS ARE THUS DETECTED WHEN THE REGISTERING BISTABLE HAS NOT BEEN RESET. D R A W I N G

Inventors

• 👤 R Terryn

Bibliographic Details