JPS57199907A - Measuring device for intervals of objects under continuous conveyance - Google Patents

Abstract

PURPOSE: Ensure the intervals of objects under continuous conveyance without the influence of their conveying states and shapes in measuring said intervals by using two rows of sensor arrays which are arranged at right angles to the conveying direction.

CONSTITUTION: Respectively three pieces of photosensors 58-1W58-3 and 59-1W 59-3 are disposed respectively in one row in the direction at right angles to the conveying direction. Each sensor consists of a pair of light emitting element and photodetector, and a sensor array 59 detects the leading edge of an object by detecting the point of the time when the first one out of 3 pieces is interrupted of light. A sensor array 58 detects the trailing edge of the object by detecting the point of the time when all of the three pieces are no longer interrupted of light. The time 60 since the passage of a succeeding object 57 through the array 59 until the passage of a preceding object through the array 58 is subjected from the time 61 required for the preceding object 56 from the array 59 up to the array 58. From the difference between these times and the speed of conveyance, the intervals of the objects are determined.

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