Patent ID: 8351830
Filing Date: 2013-01-08
Classification: B65G,G03G

Abstract:
1. A belt conveying device, comprising: an endless belt stretched by a plurality of rollers; a drive unit that is connected to one of the plurality of rollers and drives the roller; a plurality of belt velocity detectors that are arranged at a plurality of locations along a belt width direction perpendicular to a moving direction of the endless belt and detect conveyance velocities of the endless belt; and a belt-inclination calculating unit that calculates an inclination of the endless belt in the moving direction from a difference between conveyance velocities of the endless belt detected by the plurality of belt velocity detectors, wherein the plurality of belt velocity detectors include: wherein the belt-inclination calculating unit calculates an inclination with respect to the moving direction of the endless belt based on a time difference between a plurality of mark detection signals obtained from the mark detector and a result calculated by the belt-velocity calculating unit, wherein the scale portions are provided in both edges of the endless belt in the belt width direction perpendicular to the moving direction of the endless belt, the mark detector is provided in both edges in the belt width direction so as to correspond to the scale portions, and wherein an interval between the marks provided in one edge portion of the endless belt in the belt width direction is larger than an interval between the marks provided in the other edge portion.