US 12,326,221 B2
Entry detection system
Yasuhiro Tsuda, Tokyo (JP)
Assigned to Daifuku Co., Ltd., Osaka (JP)
Appl. No. 18/009,565
Filed by Daifuku Co., Ltd., Osaka (JP)
PCT Filed Apr. 23, 2021, PCT No. PCT/JP2021/016445
§ 371(c)(1), (2) Date Dec. 9, 2022,
PCT Pub. No. WO2021/251012, PCT Pub. Date Dec. 16, 2021.
Claims priority of application No. 2020-102444 (JP), filed on Jun. 12, 2020.
Prior Publication US 2023/0204157 A1, Jun. 29, 2023
Int. Cl. F16P 3/14 (2006.01)
CPC F16P 3/141 (2013.01) [F16P 3/144 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An entry detection system for detecting an object entering a predefined region, the system comprising:
an entry detection sensor configured to detect whether or not a part of the object is present in an entry detection plane having a predetermined area;
a muting sensor section configured to detect the object in order to disable the entry detection sensor from detecting the object, the muting sensor section comprising a first unit and a second unit; and
a control unit configured to control operation of the entry detection sensor based on a detection result of the muting sensor section,
wherein:
a passing direction is a direction orthogonal to the entry detection plane, a passing direction-first side is one side in the passing direction, and a passing direction-second side is another side in the passing direction,
the first unit comprises a pair of first sensors disposed on the passing direction-first side of the entry detection plane in so as to be spaced apart and opposed in a width direction extending parallel to the entry detection plane,
each of the two first sensors detects whether or not the object is present within a predefined first detection range,
the first detection range extends from each of the two first sensors toward each other in the width direction, and a pair of the first detection ranges are set so as to be spaced apart from each other in the width direction,
the second unit comprises a pair of second sensors disposed on the passing direction-second side of the entry detection plane so as to be spaced apart and opposed in the width direction,
each of the two second sensors detects whether or not the object is present within a predefined second detection range, the second detection range extends from each of the second sensors toward each other in the width direction, and a pair of the second detection ranges are set so as to be spaced apart from each other in the width direction, and
the control unit disables the entry detection sensor in response to at least one of a first detection state and a second detection state being established, the first detection state is a state in which both of the two first sensors detect the object, and the second detection state is a state in which both of the two second sensors detect the object.