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

Claim 6:
7. The base material conveying device according to claim 1, further comprising:
a winding roll on which the base material conveyed by the conveyor is wound;
a second driver which rotationally drives the winding roll to wind the base material on the winding roll; and
a second diameter meter which includes a second sensor facing the base material wound on the winding roll and measures a plurality of second measured winding diameter values corresponding to the conveying distance by measuring the diameter of the base material wound on the winding roll a plurality of times by the second sensor at the time of conveying the base material by the conveyor,
wherein:
the value acquirer obtains a second initial diameter value which is a value of the diameter of the base material wound on the winding roll before the conveyance of the base material by the conveyor is started,
the winding diameter calculator calculates a plurality of second calculated winding diameter values corresponding to the conveying distance by calculating the value of the diameter of the base material wound on the winding roll a plurality of times at the time of conveying the base material by the conveyor based on the second initial diameter value and the thickness value of the base material obtained by the value acquirer and the conveying distance measured by the conveying distance meter;
the filter unit smooths the plurality of second measured winding diameter values corresponding to the conveying distance by a second low-pass filter to extract a plurality of second smoothed winding diameter values corresponding to the conveying distance;
the difference calculator calculates a plurality of second differences corresponding to the conveying distance by performing an operation of calculating a difference between the second calculated winding diameter value and the second smoothed winding diameter value while compensating for a delay by the second low-pass filter for the plurality of second calculated winding diameter values and the plurality of second smoothed winding diameter values; and
the corrector corrects the plurality of second calculated winding diameter values corresponding to the conveying distance by the plurality of second difference corresponding to the conveying distance.