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Title:
PRESS DEVICE, TERMINAL DEVICE, ESTIMATED-BALL-SCREW-LIFESPAN CALCULATION METHOD, AND PROGRAM
Document Type and Number:
WIPO Patent Application WO/2020/049370
Kind Code:
A1
Abstract:
This invention is for simply and highly accurately estimating the lifetime of a ball screw. A device according to this invention comprises an initial load coefficient storage unit for storing a load coefficient for a ball screw, a load value detection unit, a differential value calculation unit, an average axial-direction-load-value calculation unit, an average rotation speed calculation unit, and an estimated-ball-screw-lifespan calculation unit. The load value detection unit detects values for the axial-direction load applied to the ball screw. The differential value calculation unit calculates the amount of variation in the detected axial-direction-load values. A load coefficient adjustment unit adjusts the load coefficient for the ball screw stored by the initial load coefficient storage unit on the basis of the calculated amount of load value variation. The average axial-direction-load-value calculation unit calculates an average axial-direction-load value on the basis of the detected load values. The average rotation speed calculation unit calculates the average rotation speed of the ball screw. The estimated-ball-screw-lifespan calculation unit uses the adjusted load coefficient, the calculated average axial-direction-load value, and the calculated average rotation speed of the ball screw to calculate an estimated lifespan corresponding to how the ball screw is used.

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Inventors:
IWASAKI AKIKO (JP)
Application Number:
PCT/IB2019/052943
Publication Date:
March 12, 2020
Filing Date:
April 10, 2019
Export Citation:
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Assignee:
JANOME SEWING MACHINE CO LTD (JP)
International Classes:
G01M13/02; B30B15/28
Domestic Patent References:
WO2018025634A12018-02-08
WO2009027255A22009-03-05
Foreign References:
JP2017181180A2017-10-05
JP2001271902A2001-10-05
JP2005061882A2005-03-10
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