JP2022068529A - Item detector - Google Patents

Abstract

To improve the accuracy of detecting an item.SOLUTION: An item detector 40 provided with detection means for detecting whether or not an item is present in a detection area C, wherein the detection means includes a light emitting unit (41 and 44) provided on one of a pair of side walls (50 and 60) defining a width dimension of the detection area C and a plurality of light receiving units (42 and 45) provided on the other of the pair of side walls (50 and 60), emits light from the light emitting units (41 and 44) in a manner that passes through the detection area C, and detects whether or not an item is present based on the state of light incidence on the light receiving units (42 and 45).SELECTED DRAWING: Figure 8

Description

The present invention relates to a product detection device.

Conventionally, some vending machines that sell products are designed to pay out the products stored in the product racks of the product storage to the product take-out area.

This type of vending machine is provided with a detection means for detecting a product in a detection area in the middle of the product when the product is dispensed from the product rack to the product removal area. The detection means includes a plurality of light emitting elements and a plurality of light receiving elements, and is provided so that the light emitted from each of the light emitting elements passes through the detection region and is incident on the corresponding light receiving element.

In the vending machine configured as described above, when the product passes through the detection region, the incident from the light emitting element to the light receiving element is blocked by the product, and the incident state in the light receiving element changes. Therefore, by monitoring the incident state of the light receiving element, it becomes possible to detect whether or not the product has been discharged from the product rack to the product removal area (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2011-60014

In the above-mentioned detection means, if the light emitted from the light emitting element reaches the corresponding light receiving element without being diffused, it is not necessary to consider the influence of the reflected light, and the product can be detected with high accuracy. It will be possible. However, a light emitting element having high straightness is generally expensive, and often has a great influence on the manufacturing cost of the product detection device. Therefore, in order to perform accurate detection while suppressing the manufacturing cost of the product detection device, it is necessary to consider the influence of the diffusion of the light emitted from the light emitting element.

That is, the light emitted from the light emitting element is not only incident on the light receiving element directly corresponding to the light emitting element (hereinafter, also referred to as "direct light"), but is also diffused and irradiated from the light emitting element to face the light emitting element. Some are incident on another light receiving element that is not arranged (hereinafter, also referred to as "diffused light"). Since the optical path of this diffused light to the light receiving element is different from that of the direct light, the diffused light may be incident on another light receiving element even when the direct light is blocked from being incident on the corresponding light receiving element. In such a case, even though the product has passed through the detection area, the light is continuously incident on one of the light receiving elements in the detection means, and it is difficult to perform accurate detection. It becomes. Especially when the product passing through the detection area is small, the influence of the diffused light is remarkable.

An object of the present invention is to provide a product detection device capable of improving the detection accuracy of a product in view of the above circumstances.

In order to achieve the above object, the product detection device according to the present invention is a product detection device provided with a detection means for detecting the presence or absence of a product in the detection region, and the detection means defines a width dimension of the detection region. A light emitting portion provided on one of the pair of side wall portions and a plurality of light receiving portions provided on the other side of the pair of side wall portions are provided, and light is emitted from the light emitting portion in a manner of passing through the detection region. It is characterized in that the presence or absence of a product is detected based on the state of light incident on the light receiving portion.

Further, according to the present invention, in the product detection device, the light emitting portion forms the first light emitting element arranged on the depth side of the first side wall portion forming the pair of side wall portions and the pair of side wall portions. A second light emitting element is provided on the front side of the second side wall portion, and the light receiving portion is provided at predetermined intervals along the depth direction on the depth side of the second side wall portion with respect to the second light emitting element. A plurality of first light receiving elements arranged in the above, and a plurality of second light receiving elements arranged at predetermined intervals along the depth direction on the front side of the first light emitting element in the first side wall portion. It is characterized by being equipped with.

Further, according to the present invention, in the product detection device, the first side wall portion is a region in which the first light emitting element is arranged and a region in which the second light receiving element adjacent to the first light emitting element is arranged. The second side wall portion is provided with a first shielding member for partitioning the above, and the second side wall portion is a region in which the second light emitting element is arranged and a region in which the first light receiving element adjacent to the second light emitting element is arranged. It is characterized by being provided with a second shielding member for partitioning and.

Further, in the product detection device, the present invention constitutes a surface of the first side wall portion and allows light emitted from the second light emitting element to pass toward the plurality of second light receiving elements. A first cover formed on a first inclined surface that inclines in such a manner that the light passage hole gradually separates from the second side wall portion as it goes upward or downward, and forms the surface of the second side wall portion. In an embodiment in which a plurality of second light holes that allow light emitted from the first light emitting element to pass toward the plurality of first light receiving elements are gradually separated from the first side wall portion as they move upward or downward. It is characterized by having a second cover formed on an inclined second inclined surface.

According to the present invention, the detection means irradiates light from a light emitting portion provided on one of a pair of side wall portions that define the width dimension of the detection region in a manner of passing through the detection region, and the other of the pair of side wall portions. Since the presence or absence of a product is detected based on the incident state of light on a plurality of light receiving portions provided in the above, even if diffused light is generated, the presence or absence of a product can be detected by any of the light receiving portions, and the presence or absence of the product can be detected by diffused light or the like. It has the effect of suppressing erroneous detection and improving the detection accuracy of products.

FIG. 1 is a front view showing a vending machine to which the product detection device according to the embodiment of the present invention is applied. FIG. 2 is a cross-sectional side view showing a case where a vending machine to which the product detection device according to the embodiment of the present invention is applied is viewed from the right. FIG. 3 is a cross-sectional side view showing a case where a vending machine to which the product detection device according to the embodiment of the present invention is applied is viewed from the left. FIG. 4 is an exploded perspective view of the left wall portion shown in FIG. 2. FIG. 5 is an exploded perspective view of the left wall storage portion shown in FIG. FIG. 6 is an exploded perspective view of the right side wall portion shown in FIG. FIG. 7 is an exploded perspective view of the right side wall storage portion shown in FIG. FIG. 8 is a sectional plan view of the product detection device shown in FIGS. 2 and 3. FIG. 9 is an explanatory diagram showing the operation of the left side cover and the right side cover shown in FIGS. 4 and 6.

Hereinafter, preferred embodiments of the product detection device according to the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 show vending machines to which the product detection device according to the embodiment of the present invention is applied, FIG. 1 is a front view, and FIG. 2 is a cross-sectional side surface seen from the right. It is a figure, and FIG. 3 is a cross-sectional side view seen from the left.

The vending machine 1 illustrated here is a general-purpose vending machine for selling standard-sized products such as containers and boxes, or irregular-shaped products such as bags, and is provided with a main body cabinet 10 and a front door 20. There is.

The main body cabinet 10 is a rectangular housing having an opening (hereinafter, also referred to as a front opening) 10a on the front surface, and has a product storage 11 inside.

The product storage 11 is surrounded by a heat insulating material and has a heat insulating structure. The product storage 11 is provided with a plurality of product racks 13 in the vertical direction. These product racks 13 are erected between the rack support side plates (not shown) erected on both sides of the product storage 11 respectively. The product rack 13 is configured such that product columns 14 for storing products in the front-rear direction are arranged side by side on the left and right sides. The product column 14 is conventionally known, and stores the product by restraining the product between each pitch of the spiral 14a extending in the front-rear direction. Such a product column 14 pays out the frontmost product to the front side when the driving force from the driving source is transmitted to drive the product.

The product column 14 is not necessarily limited to the one in which the product is paid out by the rotation of the spiral 14a. For example, the product is placed in the upper horizontal extending portion of the transport belt stretched endlessly between the pair of front and rear pulleys. The product may be placed and the front product may be discharged to the front side due to the displacement of the transport belt.

The front door 20 has a size sufficient to close the front opening 10a of the main body cabinet 10, and is provided swingably on the left side edge portion on the front side of the main body cabinet 10. The front door 20 has a heat insulating structure, and is provided with a window portion 21 and a product outlet 22.

The window portion 21 is configured by disposing a transparent and heat-insulating face material 23 such as double glazing, and when the front opening 10a of the main body cabinet 10 is closed by the front door 20. In addition, it is possible to visually recognize the products stored in the front row in the product columns 14 of all the product racks 13 from the outside. Although not clearly shown in the figure, an identification number is set on the product column 14, and an identification number is displayed on the front end of the product column 14 so that the product column 14 can be visually recognized through the window portion 21.

The product outlet 22 is an opening for the user to receive the purchased product, and is formed at a position below the window portion 21 in the front door 20. The opening upper edge 22a of the product outlet 22 is set to be located further below the product rack 13 arranged at the bottom. The product outlet 22 is always closed by the take-out lid 24 provided on the front door 20, and can be opened by pushing the take-out lid 24 inward. The take-out lid 24 is supported by the front door 20 via the upper end portion by an opening / closing shaft 24a along the left-right direction. Although not explicitly shown in the figure, a gasket is provided in the portion of the front door 20 located around the product outlet 22 to prevent the internal atmosphere of the product storage 11 and the outside air from flowing through the product outlet 22. It is arranged on the entire circumference of the portion facing the take-out lid 24.

Further, as shown in FIG. 1, the front door 20 is provided with the operation unit 30 integrated in a portion on the side of the window unit 21. The operation unit 30 is for the user to operate when using the vending machine 1, and is a bill insertion slot 31, a coin insertion slot 32, a return lever 33, a coin return port 34, an input section 35, and a display section 36. It is equipped with. The bill insertion slot 31 is an opening for receiving bills, and the coin insertion slot 32 is an opening for receiving coins. The return lever 33 is operated when returning money. The coin return port 34 is a portion where returned coins and change are paid out. The input unit 35 is for performing an input operation for instructing a product to be purchased. In the present embodiment, the input unit 35 is provided with a numeric keypad that is effective when money is inserted and that directly inputs the identification number of the product column 14 that stores the purchased product. The display unit 36 is for displaying the input information input from the input unit 35 and various information necessary for using the vending machine 1 such as during sale, input amount, out of change, and cancellation of bills. ..

The product storage 11 is provided with an evaporator 15a as a cooling means. The evaporator 15a constitutes a refrigerating cycle in which the refrigerant is circulated with the compressor 15b, the condenser 15c, etc. arranged in the machine room 12 defined in the lower region of the product storage 11, and is shown in its own illustration. The refrigerant that passes through the non-refrigerant passage and the air inside the product storage room 11 that passes around itself are heat-exchanged to cool the air.

The air cooled around the evaporator 15a is sucked into the ventilation passage 18 from the suction port 17a of the rear duct 17 installed on the back surface of the product storage 11 by driving the blower fan 16. By blowing out from the outlet 17b after passing through the product rack 13, the product stored in the product rack 13 (product column 14) is cooled.

A product take-out position 19 is formed in front of the machine room 12. The product take-out position 19 is a position where the product is discharged from the product column 14 by rotating the spiral 14a of the arbitrary product column 14, and the user can take out the product through the product take-out port 22.

A product detection device 40 is provided on the front side of the machine room 12 in the product storage 11. The product detection device 40 includes a pair of left and right left wall portions (first side wall portions) 50 and right side wall portions (second side wall portions) 60, and the rear end portions of the left side wall portion 50 and the right side wall portion 60 are connected to each other. It is configured to be connected to the connecting portion 70.

As shown in FIG. 4, the left side wall portion 50 includes a left side wall storage portion 51 and a left side cover (first cover) 52. As shown in FIG. 5, the left side wall storage portion 51 is a rectangular housing formed by fastening the left side storage base 511 and the left side storage cover 512 with fastening screws or the like. The left side wall storage portion 51 is installed by attaching the left side storage base 511 to the left side surface 11L of the product storage 11.

The left side wall storage portion 51 has a storage space inside, and the left side light emitting element (the first light emitting element) penetrates the left side mounting hole 513a of the left side mounting metal 513 extending in the front-rear direction in the left side storage base 511. 1 light emitting element) 41 and a plurality of (12 in the illustrated example) left light receiving elements (second light receiving elements) 42 are attached.

The left light emitting element 41 is attached to the rearmost side (depth side) in the front-rear direction, which is the depth direction, in the left wall storage portion 51 (left storage base 511). The left light emitting element 41 irradiates, for example, infrared light or the like. The plurality of left light receiving elements 42 are arranged at predetermined intervals along the front-rear direction on the front side (front side) of the left light emitting element 41.

The left side storage cover 512 has a plurality of left side communication holes 512a in a region facing the portion penetrating the left side mounting hole 513a in the left side light emitting element 41 and the portion penetrating the left side mounting hole 513a in the plurality of left side light receiving elements 42. It is formed.

By the way, in the left side wall accommodating portion 51, the left side shielding plate (first shielding member) 43 is between the left side light emitting element 41 and the left side light receiving element 42 (the rearmost left side light receiving element 42) adjacent thereto. Is installed through the rectangular elongated hole 513b of the left side mounting metal 513 and through the elongated hole 512b of the left side storage cover 512, whereby the area where the left side light emitting element 41 is arranged and the region thereof and the left side light emitting element 41 are arranged. The area where the left light receiving element 42 adjacent to the left light emitting element 41 is arranged is partitioned. That is, the left side shielding plate 43 divides the area where the left side light emitting element 41 is arranged and the area where the left side light receiving element 42 adjacent to the left side light emitting element 41 is arranged.

The left side cover 52 is formed by processing, for example, sheet metal or the like, and covers the right side of the left side wall storage portion 51 (the right side of the left side storage cover 512), and is attached to the left side surface 11L of the product storage 11 with mounting screws. It is attached. The left side cover 52 has a left side inclined surface (first inclined surface) 521 that gradually inclines to the left as the region facing the plurality of left side communication holes 512a goes upward. That is, the left side cover 52 has a left side inclined surface 521 that inclines in a manner of gradually separating from the right side wall portion 60 toward the upper side.

The left side cover 52 has a left side emission hole (first emission hole) 521a and a plurality of left side light transmission holes (first communication hole) at the same height position as the left side communication hole 512a on the left side inclined surface 521. 521b is formed along the front-rear direction.

The left emission hole 521a has an elongated hole shape that is long in the front-rear direction, and allows light emitted from the left light emitting element 41 to pass through. The plurality of left light transmitting holes 521b are provided corresponding to the left light receiving elements 42 on the front side of the left emission hole 521a, and are formed so as to be slightly displaced forward from the corresponding left communication holes 512a. ..

As shown in FIG. 6, the right side wall portion 60 includes a right side wall storage portion 61 and a right side cover (second cover) 62. As shown in FIG. 7, the right side wall storage portion 61 is a rectangular housing formed by fastening the right side storage base 611 and the right side storage cover 612 with fastening screws or the like. The right side wall storage portion 61 is installed by attaching the right side storage base 611 to the right side surface 11R of the product storage 11.

The right side wall storage portion 61 has a storage space inside, and the right side light emitting element (the first light emitting element) penetrates the right side mounting hole 613a of the right side mounting metal 613 extending in the front-rear direction in the right side storage base 611. (2 light emitting elements) 44 and a plurality of (12 in the illustrated example) right light receiving elements (first light receiving elements) 45 are attached.

The right light emitting element 44 is attached to the frontmost side (front side) in the front-rear direction, which is the depth direction, in the right side wall storage portion 61 (right side storage base 611). The right light emitting element 44 irradiates, for example, infrared light or the like. The plurality of right light receiving elements 45 are arranged at predetermined intervals along the front-rear direction on the rear side (depth side) of the right light emitting element 44.

The right storage cover 612 has a plurality of right communication holes 612a in a region facing the portion penetrating the right mounting hole 613a in the right light emitting element 44 and the portion penetrating the right mounting hole 613a in the plurality of right light receiving elements 45. It is formed.

By the way, in the right side wall accommodating portion 61, the right side shielding plate (second shielding member) 46 is between the right side light emitting element 44 and the right side light receiving element 45 (the most front right side light receiving element 45) adjacent thereto. Is installed so as to penetrate the rectangular elongated hole 613b of the right side mounting metal 613 and also penetrate the elongated hole 612b of the right side storage cover 612, whereby the area where the right side light emitting element 44 is arranged and the region thereof. The area where the right light receiving element 45 adjacent to the right light emitting element 44 is arranged is partitioned. That is, the right side shielding plate 46 divides the area where the right side light emitting element 44 is arranged and the area where the right side light receiving element 45 adjacent to the right side light emitting element 44 is arranged.

The right side cover 62 is formed by processing, for example, sheet metal or the like, and covers the left side surface of the right side wall storage portion 61 (the left side surface of the right side storage cover 612), and is attached to the right side surface 11R of the product storage 11 with mounting screws. It is attached. The right side cover 62 has a right side inclined surface (second inclined surface) 621 that gradually inclines to the right as the region facing the plurality of right side communication holes 612a goes upward. That is, the right side cover 62 has a right side inclined surface 621 that inclines in a manner of gradually separating from the left side wall portion 50 toward the upper side.

Then, on the right side cover 62, at the same height position as the right side communication hole 612a on the right side inclined surface 621, the right side emission hole (second emission hole) 621a and a plurality of right side light transmission holes (second light transmission hole) are provided. 621b is formed along the front-rear direction.

The right-side emission hole 621a has an elongated hole shape that is long in the front-rear direction, and allows light emitted from the right-side light emitting element 44 to pass through. The plurality of right light transmitting holes 621b are provided on the rear side of the right emission hole 621a corresponding to the right light receiving element 45, and are formed so as to be slightly displaced rearward from the corresponding communication holes.

In the product detection device 40 having the above configuration, as shown in FIG. 8, of the light emitted from the left light emitting element 41 and passing through the left communication hole 512a and the left emission hole 521a, the right light transmission hole 621b And the light that has passed through the right side communication hole 612a can be incidented by the plurality of right side light receiving elements 45. Then, it becomes possible to detect the presence or absence of a product in the passing region of the light emitted from the left light emitting element 41 (the region "A" in FIG. 8) based on the incident state of the light on the plurality of right light receiving elements 45. .. Further, in the product detection device 40, among the light emitted from the right light emitting element 44 and passing through the right side communication hole 612a and the right side emission hole 621a, the light passing through the left side light transmission hole 521b and the left side communication hole 512a is a plurality of left sides. It can be incidented by the light receiving element 42. Then, it becomes possible to detect the presence or absence of a product in the passing region of the light emitted from the right light emitting element 44 (the region "B" in FIG. 8) based on the incident state of the light on the plurality of left light receiving elements 42. ..

As described above, the product detection device 40 forms the product detection region C at the height position where the left light emitting element 41, the left light receiving element 42, the right light emitting element 44, and the right light receiving element 45 are installed, and the detection region C is formed. It is possible to detect the presence or absence of a product in. This detection region C is formed in a region slightly above the product take-out position 19, and is located in the width direction (left-right direction) of the detection region C at the left side wall portion 50 and the right side wall portion 60 of the product detection device 40. The dimensions are specified.

In the product detection device 40, the left light emitting element 41 and the right light emitting element 44 form a light emitting unit, and the left light receiving element 42 and the right light receiving element 45 form a plurality of light receiving units. The detection means is configured by.

According to the product detection device 40 having the above configuration, light is emitted from the left side light emitting element 41 or the right side light emitting element 44 in a manner of passing through the detection region C, and the plurality of right side light receiving elements 45 or the plurality of left side light receiving elements 45. Since the presence or absence of a product is detected based on the incident state of light on the 42, the presence or absence of a product can be detected by any of the light receiving elements 42 and 45 even if diffused light is generated, and erroneous detection due to diffused light or the like is suppressed. Therefore, it is possible to improve the detection accuracy of the product. In particular, by reducing the size between the pitches of the plurality of light receiving elements 42 and 45, it is possible to improve the detection accuracy of a small product in the detection region C.

According to the product detection device 40, the left side shielding plate 43 partitions a region in which the left side light emitting element 41 is arranged and a region in which the left side light receiving element 42 adjacent to the left side light emitting element 41 is arranged. Moreover, since the right side shielding plate 46 divides the area where the right side light emitting element 44 is arranged and the area where the right side light receiving element 45 adjacent to the right side light emitting element 44 is arranged, it is irradiated from the left side light emitting element 41. It is possible to prevent the occurrence of erroneous detection due to the incident of the light emitted from the adjacent left light receiving element 42 or the incident of the light emitted from the right light emitting element 44 by the adjacent right light receiving element 45. Can be improved.

According to the product detection device 40, the left light-transmitting hole 521b is formed on the left-side inclined surface 521 of the left-side cover 52, and the right-hand light-transmitting hole 621b is formed on the right-side inclined surface 621 of the right-side cover 62. As shown in FIG. 9, among the light emitted from the left light emitting element 41 or the right light emitting element 44, the light that does not pass through the light passing holes 521b and 621b is reflected upward and emitted to the outside of the detection region C. This makes it possible to prevent erroneous detection due to reflected light and improve detection accuracy.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made.

In the above-described embodiment, the left-side inclined surface 521 on which the left-side emission hole 521a and the plurality of left-side light-transmitting holes 521b are formed is inclined upward and gradually separated from the right-side wall portion 60, and is emitted to the right. The right inclined surface 621 formed with the holes 621a and the plurality of right light transmitting holes 621b was inclined so as to gradually separate from the left wall portion 50 toward the upward direction, but in the present invention, the left inclined surface is inclined. It may be inclined so as to gradually separate from the right side wall portion toward the lower side, or may be inclined so as to gradually separate from the left side wall portion toward the downward direction.

In the above-described embodiment, the left side light emitting element 41 and the right side light emitting element 44 are provided on the left side wall portion 50 and the right side wall portion 60, respectively, but in the present invention, the light emitting portion is provided on one of the side wall portions. A plurality of light receiving portions may only be provided on the other side of the side wall portion.

Although not mentioned in the above-described embodiment, the left light emitting element 41 and the left light receiving element 42 are attached in such a manner that the end faces penetrating the left side mounting hole 513a gradually incline to the left toward the front. Alternatively, the right light emitting element 44 and the right light receiving element 45 may be attached in such a manner that the end faces penetrating the right side mounting hole 613a gradually incline to the right toward the rear.

1 ... Vending machine, 10 ... Main body cabinet, 11 ... Product storage, 13 ... Product rack, 14 ... Product column, 19 ... Product take-out position, 20 ... Front door, 22 ... Product outlet, 40 ... Product detection device, 41 ... Left side light emitting element, 42 ... Left side light receiving element, 43 ... Left side shielding plate, 44 ... Right side light emitting element, 45 ... Right side light receiving element, 46 ... Right side shielding plate, 50 ... Left side wall part, 51 ... Left side wall storage part, 511 ... Left side storage base, 512 ... Left side storage cover, 52 ... Left side cover, 521 ... Left side inclined surface, 521a ... Left side emission hole, 521b ... Left side light-transmitting hole, 60 ... Right side wall part, 61 ... Right side wall storage part, 611 ... Right side storage base, 612 ... Right side storage cover, 62 ... Right side cover, 621 ... Right side inclined surface, 621a ... Right side emission hole, 621b ... Right side light transmission hole, C ... Detection area.

Claims (4)

A product detection device provided with a detection means for detecting the presence or absence of a product in the detection area.
The detection means
A light emitting portion provided on one of the pair of side wall portions that defines the width dimension of the detection region, and a light emitting portion.
A plurality of light receiving portions provided on the other side of the pair of side wall portions are provided.
A product detection device comprising irradiating light from the light emitting portion in a manner of passing through the detection region and detecting the presence or absence of a product based on the incident state of the light on the light receiving portion. The light emitting part is
A first light emitting element arranged on the depth side of the first side wall portion forming the pair of side wall portions, and a first light emitting element.
A second light emitting element arranged on the front side of the second side wall portion forming the pair of side wall portions is provided.
The light receiving part is
A plurality of first light receiving elements arranged at predetermined intervals along the depth direction on the depth side of the second light emitting element in the second side wall portion.
The first aspect of the present invention is characterized in that a plurality of second light receiving elements arranged at predetermined intervals along the depth direction are provided on the front side of the first light emitting element in the first side wall portion. Product detection device. The first side wall portion includes a first shielding member that separates a region in which the first light emitting element is arranged and a region in which the second light receiving element is arranged adjacent to the first light emitting element.
The second side wall portion includes a second shielding member that partitions a region in which the second light emitting element is arranged and a region in which the first light receiving element is arranged adjacent to the second light emitting element. The product detection device according to claim 2. As the plurality of first light-transmitting holes constituting the surface of the first side wall portion and allowing the light emitted from the second light emitting element to pass toward the plurality of second light receiving elements are directed upward or downward. A first cover formed on a first inclined surface that is inclined so as to be gradually separated from the second side wall portion.
As the plurality of second light-transmitting holes constituting the surface of the second side wall portion and allowing the light emitted from the first light emitting element to pass toward the plurality of first light receiving elements are directed upward or downward. The product detection device according to claim 2 or 3, further comprising a second cover formed on a second inclined surface that is inclined so as to be gradually separated from the first side wall portion.

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