Patent ID: 8639174
Filing Date: 2014-01-28
Classification: B65H,G03G

Abstract:
1. An object length measurement device, comprising: a first rotating body configured to feed an object; a passage detection unit disposed on a downstream side of the first rotating body, and configured to detect a passage of the object at a set position in an object feeding path; a rotation amount measurement unit configured to measure a rotation amount of the first rotating body in a first measurement period from when the passage detection unit starts detecting the passage of the object at the set position to a set timing before the first rotating body completes feeding the object; a second rotating body disposed on a downstream side of the first rotating body and the passage detection unit, and configured to feed the object after the first rotating body feeds the object; a speed detection unit configured to detect a first feeding speed of the object while the object is fed by the first rotating body, and configured to detect a second feeding speed of the object in a second measurement period from the set timing to when the passage detection unit detects a completion of the passage of the object at the set position; and a calculation unit configured to calculate a feeding distance of the object per a set rotation amount of the first rotating body based on the first feeding speed of the object while the object is fed by the first rotating body, and configured to calculate a length of the object based on the rotation amount of the first rotating body in the first measurement period, the feeding distance, and the second feeding speed of the object in the second measurement period.