JPH06100106A - First-in article detection device - Google Patents

Abstract

PURPOSE:To certainly detect existence of a thin bar material in a first-in article detection device to prevent double storage of an automatic warehouse. CONSTITUTION:Below the cargo receiving seat of a cargo handling gear 20, photoelectric sensors 21, 22, 23, 24 are furnished in a plural number. Positions and angles of these photoelectric sensors 21-24 are set so as to detect a bar material B at whichever position of a shelf the bar material B is located. On the deep side of the shelf, regressive reflectors 18, 19 are set in correspondence with the photoelectric sensors. The control device, when one of the photoelectric sensors 21 24 detects oblique light, judges that a first-in article exists.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for inspecting whether or not a load is already stored in a shelf in an automatic warehouse, and particularly to a crane stop allowable range for a thin detection object such as a bar material. The invention relates to a device that can be reliably detected.

[0002]

2. Description of the Related Art In an automatic warehouse, a control device manages which rack stores a load and which rack does not have a load. However, in order to prevent double storage, a photoelectric detector is provided in a cargo handling device that carries a load and travels, and the presence or absence of a load (referred to as a first-come-first-served product) in the shelf is detected by the presence or absence of reflected light. The photoelectric detector is provided below the cargo seat of the cargo handling device. (JP-A-56-48309)

[0003]

As a general rule, in an automatic warehouse that stores bar materials having a small cross section such as aluminum sash mold materials and small diameter pipes, a plurality of bar materials are
I try to store them in one shelf. However, in some cases, one bar may be stored in one shelf. In this case, the position of the one bar member on the shelf is not a specific position. Therefore, it is difficult to detect the bar material with one photoelectric detector installed below the load receiving seat of the cargo handling device.

It is an object of the present invention to provide a first-in-first-served product detecting device capable of easily detecting a bar material.

[0005]

According to the present invention, photoelectric detectors are provided below the cargo-handling seat of the cargo-handling apparatus at different vertical positions and vertical angles, and the photoelectric detectors are provided on the back side of the shelf. Is provided with a recursive reflector.

[0006]

Since a plurality of photoelectric detectors are arranged as described above, the bar material can be detected regardless of the position of the bar material.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. The shelf is composed of a pillar 11 and a cargo receiving seat 12. The other pillar and load receiving seat are not shown. There is an auxiliary pillar 15 on the back side of the shelf, and a reflector mounting seat 16 is installed at a relatively lower portion of the shelf. The recursive reflectors 18, 1 are attached to the mounting seat 16.
9 are installed. The retroreflectors 18 and 19 are bar materials B
Are installed separately in the longitudinal direction and the vertical direction.

Photoelectric detectors 21, 22, 23, 24 are installed below the cargo seat (not shown) of the cargo handling device 20 for transporting the bar material B toward the recursive reflection plates 18, 19. . Each photoelectric detector consists of a light emitter and a light receiver. The photoelectric detectors 21 and 22 face the recursive reflection plate 18, and the photoelectric detectors 23 and 24 face the recursive reflection plate 19. The height positions and sizes of the recursive reflection plates 18 and 19 and the height positions and angles of the photoelectric detectors 21, 22, 23 and 24 are determined in consideration of the size and position of the bar material B. . Further, the sizes of the recursive reflection plates 18 and 19 are determined in consideration of the stop error in the traveling direction and the vertical direction of the cargo handling device 20.

The control device which inputs the detection results of the photoelectric detectors 21, 22, 23 and 24 determines that there is a first-in-stock product when one photoelectric detector detects the light shielding.

[0010]

According to the present invention, the presence / absence of a pre-inserted product can be accurately detected even for a bar material having a small diameter.

[Brief description of drawings]

FIG. 1 is a perspective view of a first-in-goods detection device according to an embodiment of the present invention.

[Explanation of symbols]

18, 19 ... Recursive reflector, 20 ... Cargo handling equipment 21, 21
2, 23, 24 ... Photoelectric detector, B ... Bar material.

Claims (1)

[Claims] 1. A plurality of photoelectric detectors having different vertical positions and different vertical angles are provided below the cargo seat of the cargo handling device, and the recursive property corresponding to the photoelectric detectors is provided on the back side of the shelf. A first-in-goods detection device having a reflection plate.