Title:
OPTICAL SAFETY DEVICE, PRESS BRAKE, AND WORK DETECTION METHOD
Document Type and Number:
WIPO Patent Application WO/2020/137644
Kind Code:
A1
Abstract:
A light reception amount acquisition unit 60 acquires a light reception amount of a light receiver 52 per unit time at certain sampling time intervals. A light shield detection unit 66 determines whether or not the acquired light reception amount of the light receiver per unit time becomes lower than a determination threshold value Th for detecting existence of a light shield for monitoring light B, thereby detecting existence/nonexistence of the light shield for the monitoring light B. A detection sensitivity of the light shield detection unit 66 is configured in such a manner that a normal sensitivity mode is switched to a high-sensitivity mode in the case where bending is an initial working based on a predetermined working program, and an acquired height position of the light receiver 52 becomes lower than a predetermined second height position LP2.
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Inventors:
AMANO KANEHIDE (JP)
SASAKI HIDEKI (JP)
AOKI TAKAYUKI (JP)
SUZUKI TAICHI (JP)
OHASHI HUMITAKA (JP)
SASAKI HIDEKI (JP)
AOKI TAKAYUKI (JP)
SUZUKI TAICHI (JP)
OHASHI HUMITAKA (JP)
Application Number:
PCT/JP2019/049092
Publication Date:
July 02, 2020
Filing Date:
December 16, 2019
Export Citation:
Assignee:
AMADA HOLDINGS CO LTD (JP)
International Classes:
B21D5/02; B30B15/00
Foreign References:
| JP2018051603A | 2018-04-05 | |||
| JPS62188906A | 1987-08-18 | |||
| JP2008543586A | 2008-12-04 | |||
| EP1914019A1 | 2008-04-23 | |||
| JP2016128180A | 2016-07-14 |
Attorney, Agent or Firm:
MIYOSHI Hidekazu et al. (JP)
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