Patent ID: 11939179
Assignee: SCREEN HOLDINGS CO., LTD.
Field: Handling (Mechanical engineering)
Classification: CPC B | IPC B

Claim 2:
3. The base material conveying device according to claim 1, further comprising:
a dancer roller, the base material being wound on the dancer roller between the unwinding roll and the conveyor;
a roller driver which displaces the dancer roller so that a certain tension is given to the base material from the dancer roller;
a displacement amount detector which detects a displacement amount of the dancer roller; and
an encoder which measures a rotation amount of the unwinding roll,
wherein the value acquirer performs at least one operation of a pull-out operation of feeding the base material from the unwinding roll to the dancer roller and a pull-back operation of winding the base material on the unwinding roll from the dancer roller by driving the unwinding roll by the first driver with the conveyance of the base material by the conveyor stopped, and obtains the first initial diameter value by calculating the first initial diameter value based on a displacement amount of the dancer roller and a rotation amount of the unwinding roll during the execution of the one operation.