Title:
DEVICE AND METHOD FOR DETECTING DEFECT IN CARDBOARD SHEET, AND CARDBOARD BOX MANUFACTURING MACHINE
Document Type and Number:
WIPO Patent Application WO/2024/053377
Kind Code:
A1
Abstract:
The present invention provides a device and method for detecting defects in a cardboard sheet, and a cardboard box manufacturing machine. The defect detection device detects defects in a cardboard sheet in which a first crease recess is formed in one surface in the thickness direction and a second crease recess having a depth that is smaller than that of the first crease recess is formed in another surface in the thickness direction, the defect detection device comprising: a measurement device that is arranged opposing the one surface or the other surface, and measures and acquires, as a measured distance, the distance from the arrangement position to a leading end of the cardboard sheet or the distance from the arrangement position to the first crease recess or the second crease recess; a storage device that stores a preset threshold value; and a determination device that compares the threshold value and the measured distance by using a prescribed determination range set in advance from the leading end of the cardboard sheet towards a rear end, thereby identifying a magnitude relationship between the measured distance and the threshold value, and determines front and back defects or forward and rear defects of the cardboard sheet.
Inventors:
TAKEMOTO SHUICHI (JP)
NADACHI MITSUHIRO (JP)
NADACHI MITSUHIRO (JP)
Application Number:
PCT/JP2023/029999
Publication Date:
March 14, 2024
Filing Date:
August 21, 2023
Export Citation:
Assignee:
MITSUBISHI HEAVY IND MACH SYSTEMS LTD (JP)
International Classes:
B31F7/00; B31B50/04
Foreign References:
| JP2021115839A | 2021-08-10 | |||
| JP2017203660A | 2017-11-16 | |||
| US20030137667A1 | 2003-07-24 | |||
| US20090091761A1 | 2009-04-09 | |||
| JPS6072513U | 1985-05-22 | |||
| JP2021115839A | 2021-08-10 |
Attorney, Agent or Firm:
SAKAI INTERNATIONAL PATENT OFFICE (JP)
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