The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 18, 1983
Filed:
Sep. 08, 1981
Isao Suzuki, Yokohama, JP;
Haruyuki Serikawa, Yokohama, JP;
Bridgestone Tire Company Limited, Tokyo, JP;
Abstract
A method of measuring the stretch of a conveyor belt, wherein opposite ends of a belt having embedded therein steel cord cores in the longitudinal direction thereof are joined to each other, including: previously providing magnetic marks at two positions spaced apart a given distance from each other and interposing a joint of the steel cord cores of the conveyor belt therebetween; disposing two magnetic sensors spaced a given distance apart from each other in the running direction of the conveyor belt, in adjacent but non-contacting relation to the conveyor belt; detecting a period of time during which either one of the two magnetic marks moves across the two magnetic sensors during running of the conveyor belt and measuring the running speed of the conveyor belt based on the period of time and a distance across the two magnetic sensors; detecting also during running of the conveyor belt a time at which one of the magnetic marks in front in the running direction of the conveyor belt reaches one of the magnetic sensors in front in the running direction of the conveyor belt and a time at which the other of the magnetic marks in the rear in the running direction of the conveyor belt reaches the other of the magnetic sensors in the rear in the running direction of the conveyor belt and measuring a difference in time therebetween; and calculating the value of the stretch between the magnetic marks of the conveyor belt based on the measured running speed of the conveyor belt, the measured difference in time, a ratio between the distance across the magnetic marks and the distance across the magnetic sensors.