Patent ID: 7167770

Claim:
A method of correcting transfer of a thin material transfer apparatus comprising a transfer roller which is rotated in accordance with a number of input transfer pulses; a sensor which detects a front end of a thin material transferred by the transfer roller; and a processing unit which is disposed downstream from the sensor, and performs a predetermined process on the transferred thin material, the method comprising the steps of: detecting a front end of a thin material by the sensor, and transferring the thin material from a position of the sensor by a transfer pulse number corresponding to a specified distance between the sensor and the processing unit, and a transfer pulse number corresponding to a reference transfer range from a position of the processing unit; performing the process in the processing unit on the transferred thin material, thereby obtaining a first processed thin material portion; transferring the thin material by a transfer pulse number corresponding to the reference transfer range; performing the process in the processing unit on the transferred thin material, thereby obtaining a second processed thin material portion; calculating a first correction value for correcting a transfer error based on the reference transfer range and a measured length of the second processed thin material portion, and calculating a second correction value for correcting a transfer error based on measured lengths of the first and second processed thin material portions; and correcting the transfer from the sensor position to the processing unit position, and the transfer from the processing unit position based on the first and second correction values.