US 12,014,945 B2
Overhead transport vehicle and method for calculating rotation amount of winding drum in overhead transport vehicle
Keiichiro Suriki, Ise (JP); and Kazuya Aomoto, Ise (JP)
Assigned to MURATA MACHINERY, LTD., Kyoto (JP)
Filed by MURATA MACHINERY, LTD., Kyoto (JP)
Filed on Sep. 1, 2021, as Appl. No. 17/463,744.
Claims priority of application No. 2020-169670 (JP), filed on Oct. 7, 2020.
Prior Publication US 2022/0108905 A1, Apr. 7, 2022
Int. Cl. H01L 21/677 (2006.01); B66C 13/23 (2006.01); B66D 1/48 (2006.01); G01B 21/00 (2006.01); H01L 21/67 (2006.01); B66C 19/00 (2006.01)
CPC H01L 21/67733 (2013.01) [B66C 13/23 (2013.01); B66D 1/485 (2013.01); G01B 21/00 (2013.01); H01L 21/67259 (2013.01); H01L 21/67724 (2013.01); B66C 19/00 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An overhead transport vehicle comprising:
a lift stage to transfer an article;
a winding drum to overlap and wind a suspension attached to the lift stage; and
a controller to control a rotation amount of the winding drum to control a lifting/lowering amount of the lift stage; wherein
the controller is configured or programmed to execute:
a first processing including calculating, as individual values of the overhead transport vehicle, an individual value of an entire length of the suspension, an individual value of a diameter of the winding drum, and an individual value of a thickness of the suspension; and
a second processing including calculating a rotation amount of the winding drum with respect to a lifting/lowering amount of the lift stage based on the individual value of the entire length of the suspension, the individual value of the diameter of the winding drum, and the individual value of the thickness of the suspension calculated in the first processing.