Patent ID: 7754117

Claim:
A sheet forming apparatus equipped with two rolls arranged in parallel with each other leaving a gap therebetween, wherein a sheet having a front face and a back face goes through between the two rolls driven to rotate while the front face and the back face thereof are abutting the rolls, respectively, the apparatus comprising: a roll position adjustment device adjusting the position of at least one of the two rolls thereby to increase or decrease a roll gap between the two rolls; a roll position measurement device measuring a displacement of the roll position adjustment device or the position of the at least one roll adjusted by the roll position adjustment device, or both, to determine the roll gap between the two rolls; a pressing load measurement device configured to measure a pressing load acting on at least one of the two rolls; a roll position controller configured to perform a constant pressing load control in which the position of at least one of the two rolls is adjusted by the roll position adjustment device so that a deviation of a measurement value measured by the pressing load measurement device from a target control value of the pressing load becomes zero; and a sheet take-off speed controller controlling a sheet take-off speed of the sheet between the two rolls to maintain a constant sheet thickness based on measurements by the roll position measurement device under the constant pressing load control by the roll position controller.