JPH0682011U - Occupancy detection device - Google Patents

Abstract

(57) [Abstract] [Purpose] In the presence detection device consisting of a reflective photoelectric sensor that detects the presence or absence of luggage, when a white luggage tag is attached to the luggage placed on the luggage placement surface. An object of the present invention is to prevent occurrence of a situation in which sensor light from a light emitter is reflected by the tag, and a light receiver receives the reflected light and erroneously detects that there is no seat. In the presence detection apparatus, a photosensor 1 having a light emitting body 1a and a light receiving body 1b and a reflector 2 are opposed to each other in an oblique manner with a loading surface of a luggage therebetween, and a sensor optical path L is obliquely formed. Set.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a configuration of an occupancy detection device for detecting the presence or absence of a luggage, which is provided on a luggage placement portion of a conveyor device such as a stacker crane.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, an occupancy detection device including a reflective photoelectric sensor for detecting the presence or absence of luggage has been known. For example, in an automated warehouse, it may be installed on the slide fork of a stacker crane that loads and unloads cargo, or it may be installed on the loading and unloading station bed for loading and unloading cargo. ing.

Here, the configuration of the conventional presence detection apparatus will be described with reference to FIG. FIG. 3 is a side view of a lifting platform of a stacker crane equipped with a conventional seat detection device. An in-situ detection device using a reflective photoelectric sensor reflects a light from the light emitting body 1a of the photo sensor 1 which has both the light emitting body 1a and the light receiving body 1b to the side of the luggage placement portion. The reflectors 2 are installed so as to face each other, and when the luggage is not placed on the luggage placement surface, the light from the light emitter 1a is reflected by the reflector 2 as shown in FIG. When the light receiver 1b receives the reflected light, it is confirmed that there is no seat. On the other hand, when the luggage is placed, the luggage absorbs the light from the light emitter 1a. The light is not collected and does not reach the reflector 2, and the light receiver 1b does not receive the light from the reflector 2. At this time, it is detected that the load is placed, and based on the detection of the placement of the load, when the stacker crane is equipped with the load, the driving of the slide fork is started.

[0004]

[Problems to be solved by the device]

 In the conventional seating detection device, the photosensor 1 and the reflector 2 are fixed in position with the luggage mounting surface therebetween, and the sensor optical path L between both members is horizontal. On the other hand, depending on the luggage, a luggage tag may be attached to the side surface. When the mount of this tag is white, as shown in FIG. 4, the light from the light emitter 1a of the photosensor 1 is reflected by the mount F, and the reflected light is received by the light receiver 1b of the photosensor 1. In other words, there is a situation that the slide fork does not start driving, for example, in the stacker crane described above, even though the load P is placed and no one is present.

[0005]

[Means for solving the problem]

 The present invention uses the following means in order to solve the above problems. That is, in the photoelectric sensor of the reflection type for detecting the presence or absence of the luggage arranged in the luggage placement section, the presence detection device is configured by setting the sensor optical path in an oblique direction with respect to the loading surface of the luggage.

[0006]

[Action]

 Since the sensor light path is passed obliquely with respect to the luggage placed on the luggage placement surface, even if the luggage tag attached to the side of the luggage matches the sensor light path, the reflection of the sensor by the mount of the luggage tag The light escapes from the photoreceptor, preventing malfunctions.

[0007]

【Example】

 An embodiment of the configuration of the present invention will be described with reference to the accompanying drawings. Fig. 1 is a perspective view of a stacker crane equipped with the seating detection device of the present invention, and Fig. 2 is a side view of the lifter part of the stacker crane in which the sensor optical path of the seating detection device is set obliquely. The case where the pedestal detection device is installed on the lift table 3 of S will be described. In the stacker crane S, as shown in FIG. 1, an upper frame 11 is provided horizontally on the upper part between the front mast 8 and the rear mast 9 and on the lower part. The traveling body 12 is installed horizontally, and the upper frame 11 and the traveling body 12 are mounted between the guide rails 16 and the traveling rails 17.

A drive unit 13 having a traveling motor and a lifting motor installed therein is arranged at the front part of the traveling body 12, and an operation panel 15 is arranged at the rear part so that an operator can operate on step 14. Has been done. An ascending / descending platform 3 is disposed between the front mast 8 and the rear mast 9, and front and rear columns 5 and 6 are provided up and down on the front and rear of the elevating platform 3, respectively. , And guide rollers 7, 7 ... Are arranged on the rear surface of the rear column 6 so as to sandwich the front mast 8 and the rear mast 9 to serve as an elevating guide for the elevating table 3 and a lifting roller chain. 10 and 10 are hung above the front support column 5 and the rear support column 6 and connected to the drive unit 13, and the raising and lowering platform 3 is driven up and down by the drive of a raising and lowering motor. A slide fork 4 for loading and unloading luggage to and from a loading / unloading station or a rack of a warehouse is arranged between the front support column 5 and the rear support column 6 so that the slide fork 4 can move in the left and right directions.

The presence detection device of the present invention will be described with reference to FIG. A photo sensor 1 is fixed to the front support column 5 of the stacker crane S, and a reflector 2 is fixed to the rear support column 6. The photo sensor 1 includes a light emitter 1a and a light receiver 1b, and is arranged so that the light from the light emitter 1a is reflected by the reflector 2 and received by the light receiver 1b. If the luggage is not present and the light receiver 1b does not receive light, the presence of the luggage is detected.

Then, the photosensor 1 and the reflector 2 are arranged so as to have different vertical heights, and the light emitter 1a, the light receiver 1b, and the reflector 2 are opposed to each other, and the sensor optical path L is inclined vertically. Set in a letter. With such a configuration, when the luggage P is placed on the slide fork 4 housed on the lifting table 3, the sensor light from the light emitter 1a is absorbed by the luggage and the light receiver 1b is reflected. It does not receive the reflected light from the body 2. As a result, it is detected that the baggage P inherited from the loading / unloading station is placed on the slide fork 4 (occupancy detection), and the stacker crane S operates based on the presence detection to move the slide fork 4 The upper load P is carried into the desired rack. When the stacker crane S is used for unloading from the rack, it detects that the slide fork 4 has inherited the load from the rack, and the stacker crane S operates based on the detection. The luggage is transported to the loading / unloading station.

On the other hand, when the luggage P is not placed on the slide fork 4, it is confirmed that the light receiving body 1 b receives the reflected light from the reflecting body 2 and that there is no seat. , The stacker crane S does not operate. Here, conventionally, since the sensor optical path is set horizontally, even if the luggage is placed on the slide fork 4, if a white mount tag is attached to the side surface of the luggage, it becomes white. The backing paper reflected the sensor light from the light receiver 1a, and the light receiver 1b received this reflector, and there was a situation in which the stacker crane S did not operate due to the absence of seats. As described above, in the seating detection device, the sensor optical path L is set to be diagonally up and down, so that even if the white mount tag F is attached to the side surface, the sensor optical path L matches the position of the tag F. Therefore, such false detection is avoided.

The photosensor 1 may be fixed to the rear support column 6 and the reflector 2 may be fixed to the front support column 5, and either the photosensor 1 or the reflector 2 may be set at a higher position. May be. Alternatively, one member may be fixed, and the other member may be attached to the column so that the member can be moved up and down so that the difference between the vertical positions can be adjusted.

The seat detection device as described above is also provided at the loading / unloading station provided at the starting end of the warehouse. That is, by confirming the presence of the load at the loading / unloading station, the slide fork 4 of the stacker crane S is driven to project, and the load on the loading / unloading station is taken over and transferred to the rack of the warehouse. To do. Alternatively, when unloading to the loading / unloading station, the load transported by the stacker crane S from the rack is placed on the loading / unloading station by the slide fork 4 and the loading / unloading station is moved to the loading / unloading station. When the seat detection device detects the presence of a load on the station, the slide fork 4 is driven to be stored in the storage position in the stacker crane S. Further, the seating detection device of this loading / unloading station also has the same configuration as the seating detection device of the stacker crane S, and the sensor optical path is set to the upper and lower diagonal, or the front and rear, or the left and right diagonal, Even if the white tag F is attached to the baggage P, it is possible to avoid the absence of a person due to a false detection.

[0014]

[Effect of device]

 The present invention has the following effects by being configured as described above. That is, since the sensor light path of the presence detection device is set in the oblique direction, even if the white mount tag is attached to the side of the luggage placed on the luggage placement surface and the sensor light path coincides with the position of the luggage tag. , The reflection of the sensor light by the luggage tag is in the direction of leaving, and it is not incident on the light receiving body, so that the situation that the presence of a luggage is erroneously detected as being unoccupied is avoided, and the drive based on the sensor detection is performed. The accuracy of control is improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a stacker crane equipped with the seat detection device of the present invention.

FIG. 2 is a side view of an elevating table part of a stacker crane equipped with an occupant detection device with a sensor optical path set obliquely.

FIG. 3 is a side view of a lifting platform of a stacker crane equipped with a conventional seat detection device.

FIG. 4 is a side view showing a state in which a luggage having a white mount tag attached to the side surface is placed in FIG. 3;

[Explanation of symbols]

 S Stacker crane L Sensor optical path P Luggage F White mount tag 1 Photo sensor 1a Light emitter 1b Light receiver 2 Reflector 3 Lift

Claims (1)

[Scope of utility model registration request] 1. In a photoelectric sensor of a reflection type for detecting presence / absence of luggage arranged in a luggage mounting portion, a sensor optical path is set in an oblique direction with respect to a loading surface of the luggage, and presence detection is performed. apparatus.