Patent ID: 9400472
Filing Date: 2016-07-26
CPC Classification: G03G

Claim Text:
1. A belt conveyance apparatus, comprising: a belt; a driving roller to rotate and drive the belt; a first sensor to directly detect a surface speed of the belt; a second sensor to detect a rotation speed of the driving roller; a first calculator to calculate a first deviation from a target speed based on the surface speed and the target speed; a memory to store a correction value corresponding to the first deviation; a second calculator to calculate a second deviation from the target speed corrected by the first deviation based on the target speed, the first deviation and the rotation speed of the driving roller; a controller to control the rotation speed of the driving roller based on the second deviation; and a switch to switch the first deviation to be used for calculating the second deviation by the second calculator to the correction value stored in the memory when the controller judges that the first sensor is abnormal, wherein when the correction value stored in the memory is used by the second calculator after the switch switches the first deviation to the correction value, the second calculator calculates the second deviation from the target speed, the correction value, and the rotation speed of the driving roller.