Patent ID: 7775518
Filing Date: 2010-08-17
Classification: B65H

Abstract:
1. A sheet carrying device comprising: first and second rollers arranged at different positions from each other in a direction orthogonal to a sheet carrying direction, each of which can be separately driven to rotate; a first pair of sensors including at least two sensors arranged in an upstream vicinity of the first and second rollers in the sheet carrying direction and arrayed in the direction orthogonal to the sheet carrying directions; a second pair of sensors including at least two sensors arranged in a downstream vicinity of the first and second rollers in the sheet carrying direction and arrayed in the direction orthogonal to the sheet carrying direction; a first skew determining unit configured to determine a quantity of skew of the sheet in accordance with a detection result from the first pair of sensors; a first control unit configured to separately control driving of each of the first and second rollers to carry the sheet in such a manner as to reduce the quantity of skew determined by the first skew determining unit; a second skew determining unit configured to determine a quantity of skew of the sheet in accordance with a detection result from the second pair of sensors; and a second control unit configured to separately control driving of each of the first and second rollers to carry the sheet in such a manner as to reduce the quantity of skew determined by the second skew determining unit.