Patent ID: 7870986

Claim:
A clearance adjustment method for a lead-in roller clearance adjustment mechanism including a pair of lead-in rollers for guiding a web with a clearance therebetween, a clearance adjustment mechanism for adjusting an amount of clearance between the pair of lead-in rollers, a drive source for driving the clearance adjustment mechanism, and a first detector for detecting any one of a corresponding one of output position of the drive source and the amount of clearance, and the lead-in roller clearance adjustment mechanism being configured to adjust the amount of clearance automatically, the method comprising: inputting a web thickness of the web; setting the amount of clearance at a value to prevent a tow portion of an automated paper threading device from clashing with the lead-in rollers before the automated paper threading device threads the web into a lead-in roller unit; and setting the amount of clearance at a value corresponding to the inputted web thickness of the web after the automated paper threading device threads the web into the lead-in roller unit.