CN214878035U - Carton placement system - Google Patents

Abstract

The application discloses carton placement system. The carton placing system comprises a transmission device, a moving device and a distance measuring device. The conveying device is used for conveying materials; the moving device moves the materials to a fixed height above the conveying device; the distance measuring device is arranged on the conveying device and used for detecting the distance between the bottom surface of the material and the conveying surface of the conveying device; the mobile device releases the material when the material is at a release height, which is determined according to the distance and the fixed height. In the carton placing system of this application embodiment, range unit detects the distance between the bottom surface of material and transmission device's the conveying face, and mobile device releases the material when the material is in the release height, and the release height is confirmed according to distance and fixed height to make mobile device can the high-speed migration release material of release and material can not appear damaging, thereby improve the efficiency of placing the material, with the work efficiency who improves carton placing system.

Description

Carton placement system

Technical Field

The application relates to the technical field of intelligent robots, in particular to a carton placing system.

Background

With the development of robotics, industrial automation is becoming more and more popular, and factories use more and more manipulators to replace manual work to perform production operations of mass products. Nowadays, when machinery is received and is replaced workman's transport material to place the conveyer belt, often because the shape or the size of material are different, for avoiding placing the material and appearing damaging, the manipulator often need slowly descend and place the material, leads to manipulator work efficiency lower. How to guarantee that the material can not appear damaging the time, improve the work efficiency of manipulator is the problem that needs solve urgently.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a carton placing system.

The carton placing system of this application embodiment includes transmission device, mobile device and range unit. The conveying device is used for conveying materials; the moving device moves the materials to a fixed height above the conveying device; the distance measuring device is arranged on the conveying device and used for detecting the distance between the bottom surface of the material and the conveying surface of the conveying device; the mobile device releases the material when the material is at a release height, the release height being determined from the distance and the fixed height.

In some embodiments, the distance measuring device includes a mounting plate and a plurality of first sensors, the plurality of first sensors are disposed on the mounting plate and are sequentially arranged along an extending direction of the mounting plate, the mounting plate is disposed on the conveying device, and the extending direction is perpendicular to the conveying surface.

In some embodiments, any two adjacent first sensors of the plurality of first sensors are equally spaced.

In some embodiments, the mounting plate is sequentially provided with a plurality of mounting holes along the extending direction, and the first sensor is arranged through the mounting holes.

In certain embodiments, the carton placement system further comprises a control device coupled to the plurality of first sensors.

In certain embodiments, the control device comprises a hub comprising a plurality of power supply interfaces, the power supply interfaces being connected to the first sensor.

In some embodiments, the first sensor emits laser light in a direction in which the material is located, after the laser light is blocked by the material, the first sensor receives the laser light reflected by the material to generate a first signal, and sends the first signal to the control device, and the control device determines the thickness of the material according to the number of the received first signals and determines the distance according to the thickness and the fixed height.

In some embodiments, the first sensors are numbered sequentially according to the number of the mounting height, the mounting height is the distance between the first sensors and the conveying surface, the first sensors emit laser light in the direction of the material, the first sensors receive the laser light reflected by the material to generate second signals, and send the second signals to the control device, the second signals include the number of the first sensors, and the control device determines the distance according to the number in the second signals.

In some embodiments, the number of the first sensor and the installation height are in one-to-one correspondence, the higher the installation height is, the larger the number of the first sensor is, and the control device determines the distance according to the minimum number in all the second signals; or the higher the mounting height is, the smaller the number of the first sensor is, and the control device determines the distance according to the maximum number of all the second signals.

In some embodiments, the distance measuring device includes a second sensor that emits laser light toward the bottom surface of the material and receives the laser light reflected by the bottom surface of the material to detect the distance.

In the carton placing system of this application embodiment, distance measuring device detects the distance between the bottom surface of material and transmission device's the conveying face, and mobile device releases the material when the material is in the release height, and the release height is confirmed according to distance and fixed height to improve the efficiency of placing the material and the damage can not appear in the material, in order to improve carton placing system's work efficiency.

Additional aspects and advantages of embodiments of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments of the present application.

Drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a perspective view of a carton placement system according to certain embodiments of the present application;

FIG. 2 is a perspective view of a distance measuring device and a control device of the carton placement system according to certain embodiments of the present application;

FIG. 3 is a schematic plan view of a distance measuring device of certain embodiments of the present application measuring a material;

FIG. 4 is a schematic plan view of another embodiment of a distance measuring device of the present application measuring a material;

FIG. 5 is a schematic plan view of a first sensor of a distance measuring device according to some embodiments of the present disclosure measuring materials sequentially decreasing in height from large to small and in number from top to bottom;

FIG. 6 is a schematic plan view of a first sensor of certain embodiments of the present application measuring materials sequentially and incrementally from large to small in installation height and numbered from top to bottom;

fig. 7 is a perspective view of a distance measuring device as a second sensor in the carton placement system according to some embodiments of the present application.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the embodiments of the present application, and are not to be construed as limiting the embodiments of the present application.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise" indicate orientations or positional relationships based on the orientation or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be considered as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

Referring to fig. 1, the present application provides a carton placement system 100. The carton placement system 100 includes a transport device 10, a moving device 20, and a ranging device 30. The conveying device 10 is used for conveying materials 40; the moving device 20 moves the material 40 to a fixed height above the conveying device 10; the distance measuring device 30 is arranged on the conveying device 10, and the distance measuring device 30 detects the distance between the bottom surface 41 of the material 40 and the conveying surface 11 of the conveying device 10; the moving means 20 releases the material 40 when the material 40 is at a release height, which is determined by the distance and the fixed height.

Wherein the fixed height is a height that is set in advance for the carton placement system 100. The fixed height ensures that when the moving device 20 drives the material 40 of any size to move above the conveying device 10, no collision occurs between the material 40 and the conveying device 10. Likewise, the release height is a height that is set in advance by the carton placement system 100, and specifically, the release height is a distance between the bottom surface 41 of the material 40 and the conveying surface 11 of the conveyor 10 when the material 40 is released. The release height is related to the material 40 actually transferred, for example, when the material 40 is a carton, the release height may be higher. For another example, when the material 40 is glass, the release height needs to be low to ensure that the material 40 does not break when the material 40 is released onto the conveying surface 11. In general, the release height is a combined height by considering the falling resistance of the material 40 and the impact resistance of the conveying device 10, at which the material 40 and the conveying device 10 are not damaged due to the excessively high release height, and at the same time, the work efficiency of the carton placing system 100 can be improved.

In the carton placing system 100 according to the embodiment of the present application, the distance measuring device 30 detects the distance between the bottom surface 41 of the material 40 and the conveying surface 11 of the conveying device 10, the moving device 20 releases the material 40 when the material 40 is at the release height, and the release height is determined according to the distance and the fixed height, so that the moving device 20 can move quickly to the release height to release the material 40, the efficiency of placing the material 40 is improved, the material 40 is not damaged, and the work efficiency of the carton placing system 100 is improved.

Referring to fig. 1 and 2, the carton placing system includes a conveying device 10, a moving device 20, a distance measuring device 30, and a control device 50.

The transfer device 10 is used for transferring material, and the transfer device 10 comprises a movable conveying surface 11, through which conveying surface 11 the material 40 can be transferred to the next production line or placing area. In one embodiment, the conveying surface 11 may be a conveyor belt, and the conveying surface 11 moves around the conveyor 10 to move the material 40 on the conveyor 10. In another embodiment, the conveying surface 11 may be composed of a plurality of cylinders which are in the same plane and tangent to each other, and when the material 40 is transported by the transporting device 10, the plurality of cylinders on the conveying surface 11 rotate in the same direction, so as to move the material 40 on the transporting device 10.

The moving device 20 may be a mechanical arm, the moving device 20 may clamp the material 40 to carry the material 40, and the moving device 20 may drive the material 40 to move to a fixed height above the conveying device 10, so that the distance measuring device 30 may detect a distance between the bottom surface 41 of the material 40 and the conveying surface 11 of the conveying device 10, thereby obtaining a vertical moving distance of the moving device 20 to the conveying device 10 and a releasing height of the material 40 when the material 40 is required to be released, and completing releasing the material 40, thereby preventing the material 40 from being too high from the conveying device 10 when the material 40 is placed on the moving device 20, damaging the material 40 and the conveying device 10, and simultaneously preventing the moving device 20 or the material 40 from colliding with the conveying device 10 due to an excessively large vertical distance of the moving device 20 to the conveying device 10, and improving the service life and safety of the carton placing system 100. And the distance between the bottom surface 41 of the material 40 and the conveying surface 11 of the conveying device 10 is detected by the distance measuring device 30 to be the release height of the material 40, so that the moving device 20 can be rapidly moved from the fixed height to the release height, thereby improving the working efficiency of the carton placing system 100.

Referring to fig. 2, the distance measuring device 30 includes a mounting plate 31 and a plurality of first sensors 32. The plurality of first sensors 32 are disposed on the mounting plate 31 and are sequentially arranged along the extending direction of the mounting plate 31. The distance measuring device 30 may be a laser reflection type photoelectric distance measuring device or an acoustic distance measuring device, wherein the distance measuring device has a distance measuring function, and the application takes the case that the distance measuring device 30 is a laser reflection type photoelectric distance measuring device as an example, it can be understood that the distance measuring device 30 is not limited to the laser reflection type photoelectric distance measuring device.

The mounting plate 31 is disposed on the transfer device 10, and the extending direction of the mounting plate 31 is perpendicular to the conveying surface 11 of the transfer device 10. The mounting plate 31 has a plurality of mounting holes 311 formed therein in sequence along the extending direction, and the first sensor 32 is inserted into the mounting holes 311.

In one embodiment, the first sensor 32 is disposed through the mounting hole 311 and the end far away from the transmission device 10 may be provided with a screw thread, and the first sensor 32 is fixed on the mounting hole 311 by the nut and the screw thread, so as to realize the detachable connection of the first sensor 32, and facilitate the later maintenance, cleaning and replacement with the first sensor 32.

The first sensor 32 is connected to the power supply interface 511 to enable the control device 50 to control the plurality of first sensors 32. In one embodiment, the plurality of first sensors 32 are connected to a power interface 511, so that the control device 50 controls the power-on and power-on of the plurality of first sensors 32 simultaneously. In another embodiment, each first sensor 32 is individually connected to one power supply interface 511, on one hand, so that the control device 50 can individually control the power-on and power-on of one first sensor 32, and on the other hand, each first sensor 32 is individually connected to one power supply interface 511, so that the interference of signals transmitted among a plurality of first sensors 32 can be avoided.

In one embodiment, the distance between any two adjacent first sensors 32 of the plurality of first sensors 32 is the same, and the fixed height is the height position (as shown in fig. 3) of the first sensor 32 that is farthest from the conveying surface 11 of the conveying device 10 when the moving device 20 moves to the first sensor 32 of the plurality of first sensors 32. The control device 50 controls the plurality of first sensors 32 to be started, the plurality of first sensors 32 emit laser to the direction of the material 40, when the moving device 20 moves the material 40 to a fixed height above the conveying device 10, the laser emitted by the plurality of first sensors 32 is shielded by the material 40, part of the first sensors 32 can generate first signals according to the received laser emitted by the material 40 and send the first signals to the control device 50, and the control device 50 determines the thickness of the material 40 according to the number of the received first signals.

For example, there are 7 first sensors 32 in total, and the laser light of the first sensor 32 closest to the conveying surface 11 of the conveying device 10 is spaced from the conveying surface 11 by 0 centimeter (cm), and the spacing between two adjacent first sensors 32 is 10 cm. In one example, when the number of the first signals received by the control device 50 is 3, as shown in fig. 3, the thickness of the material 40 is 20 cm, the control device 50 can judge that the distance between the bottom surface 41 of the material 40 and the conveying surface 11 of the conveying device 10 is 40 cm according to the thickness of the material 40 and the fixed height, and according to the release height, the vertical distance that the moving device 20 needs to move towards the conveying device 10 can be obtained, so that the moving device 20 can be quickly moved to the release height to release the material 40, and the work efficiency of the carton placing system 100 can be improved. In another example, when the number of the first signals received by the control device 50 is 3, as shown in fig. 4, the thickness of the material 40 is greater than 20 cm and less than 30 cm, the control device 50 may determine that the distance between the bottom surface 41 of the material 40 and the conveying surface 11 of the conveying device 10 is greater than 30 cm and less than 40 cm according to the thickness and the height of the material 40, and the release height is greater than or equal to the distance between two adjacent first sensors 32 to ensure that the material 40 does not collide with the conveying device 10 when the material 40 vertically moves to the conveying device 10 for a distance greater than 30 cm. In summary, when the distance between two adjacent first sensors 32 is the same, the release height is greater than or equal to two adjacent first sensors 32, so that the moving device 20 can safely and quickly move to the release height to release the material 40, thereby improving the working efficiency of the carton placing system 100.

In one embodiment, the plurality of first sensors 32 are numbered sequentially according to the size of the mounting height, which is the distance between each first sensor 32 and the conveying surface 11. The control device 50 controls the plurality of first sensors 32 to be turned on, the plurality of first sensors 32 emit laser light in the direction of the material 40, when the moving device 20 moves the material 40 to a fixed height above the conveying device 10, the laser light emitted by the plurality of first sensors 32 is shielded by the material 40, a part of the first sensors 32 can generate second signals according to the received laser light emitted by the material 40, and send the second signals to the control device 50, wherein the second signals comprise the number of the first sensors 32, and the control device 50 can determine the distance between the bottom surface 41 of the material 40 and the conveying surface 11 of the conveying device 10 according to the received number.

The numbers of the first sensors 32 may decrease sequentially from the large to the small through the installation height, that is, the higher the installation height is, the larger the numbers are, when the control device 50 receives the second signal, the control device 50 may determine the distance between the bottom surface 41 of the material 40 and the conveying surface 11 of the conveying device 10 through the smallest number in the second signal. The numbers of the first sensors 32 may also be decreased from small to large by the installation height, and the numbers decrease from top to bottom, that is, the higher the installation height, the smaller the numbers, and when the control device 50 receives the second signal, the control device 50 may determine the distance between the bottom surface 41 of the material 40 and the conveying surface 11 of the conveying device 10 by the largest number in the second signal.

In one example, the numbers of the first sensors 32 are sequentially decreased from the large to the small by the installation height, that is, the numbers are larger as the installation height is higher, and the distance between two adjacent first sensors 32 is 10 cm, as shown in fig. 5. The mounting height corresponding to the number 7 is 60 cm, the mounting height corresponding to the number 6 is 50 cm, the mounting height corresponding to the number 5 is 40 cm, the mounting height corresponding to the number 4 is 30 cm, the mounting height corresponding to the number 3 is 20 cm, the mounting height corresponding to the number 2 is 10 cm, the mounting height corresponding to the number 1 is 0 cm, when the control device 50 receives 3 second signals, the three signals correspond to 7, 6 and 5, the control device 50 can obtain that the distance between the bottom surface 41 of the material 40 and the conveying surface 11 of the conveying device 10 is less than or equal to 40 cm and greater than 30 cm through the number 5, and can obtain that the distance between the bottom surface 41 of the material 40 and the conveying surface 11 of the conveying device 10 is 40 cm according to the fact that the release height is greater than or equal to the distance between two adjacent first sensors 32, namely the release height is greater than or equal to 10 cm, thereby obtaining the vertical distance that the moving device 20 needs to move towards the conveying device 10, so as to satisfy the condition that no collision occurs between the materials 40 and the conveying device 10, and the moving device 20 can move to the releasing position safely and quickly to release the materials 40, so as to improve the working efficiency of the carton placing system 100.

In another example, the numbers of the first sensors 32 are sequentially increased from the large to the small by the installation height, that is, the numbers are smaller as the installation height is higher, and the distance between two adjacent first sensors 32 is 10 cm, as shown in fig. 6. The mounting height corresponding to the number 1 is 60 cm, the mounting height corresponding to the number 2 is 50 cm, the mounting height corresponding to the number 3 is 40 cm, the mounting height corresponding to the number 4 is 30 cm, the mounting height corresponding to the number 5 is 20 cm, the mounting height corresponding to the number 6 is 10 cm, the mounting height corresponding to the number 7 is 0 cm, when the control device 50 receives 3 second signals, the three signals correspond to 1, 2 and 3, the control device 50 can obtain that the distance between the bottom surface 41 of the material 40 and the conveying surface 11 of the conveying device 10 is less than or equal to 40 cm and greater than 30 cm through the number 3, and according to the fact that the release height needs to be greater than or equal to the distance between two adjacent first sensors 32, namely the release height needs to be greater than or equal to 10 cm, the distance between the bottom surface 41 of the material 40 and the conveying surface 11 of the conveying device 10 can be equal to 40 cm, thereby obtaining the vertical distance that the moving device 20 needs to move towards the conveying device 10, so as to satisfy the condition that no collision occurs between the materials 40 and the conveying device 10, and the moving device 20 can move to the releasing position safely and quickly to release the materials 40, so as to improve the working efficiency of the carton placing system 100.

Referring to fig. 7, the distance measuring device 30 may further include a second sensor 33, specifically, the second sensor 33 is vertically disposed, and the second sensor 33 can emit laser to the bottom surface 41 of the material 40 and receive the laser reflected by the material 40. In one embodiment, the moving device 20 moves the material 40 to a fixed height, and the second sensor 33 can emit laser light to the bottom surface 41 of the material 40 and receive the laser light reflected by the material 40, and further obtain the vertical distance that the moving device 20 needs to move to the conveying device 10 according to the laser light reflected by the material 40 to obtain the distance from the bottom surface 41 of the material 40 to the conveying surface 11, so that the moving device 20 can move to the release position safely and quickly to release the material 40, thereby improving the working efficiency of the carton placing system 100.

Referring to fig. 2, the control device 50 is used for controlling the distance measuring device 30. The control device 50 includes a hub 51, and the hub 51 includes a plurality of power supply interfaces 511, so as to simplify the connection between the control device 50 and the ranging device 30 and reduce the number of connection wires.

Specifically, the control device 50 is connected to the first sensor 32 or the second sensor 33 through the power supply interface 511 to control the first sensor 32 or the second sensor 33. When the control device 50 is activated, the first sensor 32 or the second sensor 33 is powered on to detect the distance between the bottom surface 41 of the material 40 and the conveying surface 11 of the conveyor 10, and when the control device 50 is deactivated, the first sensor 32 or the second sensor 33 is powered off, and the first sensor 32 or the second sensor 33 cannot detect the distance between the bottom surface 41 of the material 40 and the conveying surface 11 of the conveyor 10. The control device 50 is also used to process the signals transmitted by the first sensor 32 or the second sensor 33 to obtain the thickness of the material 40 and to obtain the distance between the bottom surface 41 of the material 40 and the conveying surface 11 of the conveyor 10 when the material 40 is in the fixed position by means of the thickness of the material 40 and the fixed height.

In one embodiment, a power interface 511 may be connected to the plurality of first sensors 32 to facilitate the control device 50 to control the powering on and powering on of the plurality of first sensors 32 simultaneously. In another embodiment, a power supply interface 511 is separately connected to a first sensor 32, on one hand, so that the control device 50 can separately control the power-on and power-on of a certain first sensor 32, and on the other hand, each first sensor 32 is separately connected to a power supply interface 511, so that the interference of signals transmitted among a plurality of first sensors 32 can be avoided.

In the description herein, reference to the terms "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a particular feature, structure, material, or characteristic described in connection with the embodiments or examples is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations of the above embodiments may be made by those of ordinary skill in the art within the scope of the present application, which is defined by the claims and their equivalents.

Claims (10)

1. A carton placement system, comprising:

a conveying device for conveying material;

a moving device that moves the material to a fixed height above the conveyor;

the distance measuring device is arranged on the conveying device and used for detecting the distance between the bottom surface of the material and the conveying surface of the conveying device;

the mobile device releases the material when the material is at a release height, the release height being determined from the distance and the fixed height.

2. A carton placement system according to claim 1, wherein said distance measuring means comprises a mounting plate and a plurality of first sensors arranged on said mounting plate and arranged one after the other along a direction of extension of said mounting plate, said mounting plate being arranged on said conveying means, said direction of extension being perpendicular to said conveying surface.

3. The carton placement system according to claim 2, wherein any adjacent two of the first sensors of the plurality of first sensors are equally spaced.

4. The carton placement system according to claim 2, wherein the mounting plate is sequentially provided with a plurality of mounting holes along the extending direction, and the first sensor is disposed through the mounting holes.

5. A carton placement system according to claim 2, further comprising a control device connected to the plurality of first sensors.

6. A carton placement system according to claim 5, wherein said control means comprises a hub comprising a plurality of power supply interfaces, said power supply interfaces being connected to said first sensor.

7. A carton placement system according to claim 5, characterized in that said first sensor emits a laser in the direction of said articles, said first sensor receives said laser reflected by said articles after said laser has been blocked by said articles to generate a first signal and sends said first signal to said control means, said control means determines the thickness of said articles according to the number of said first signals received and determines said distance according to said thickness and said fixed height.

8. A carton placement system according to claim 5, wherein said first sensors are numbered sequentially according to the size of a mounting height, said mounting height being the distance between said first sensor and said conveying surface, said first sensor emitting a laser in the direction of said articles, said first sensor receiving said laser reflected from said articles to generate a second signal and transmitting said second signal to said control means, said second signal comprising the number of said first sensor, said control means determining said distance based on the number in said second signal.

9. The carton placement system according to claim 8, wherein the number of the first sensor and the mounting height correspond one-to-one, the higher the mounting height, the larger the number of the first sensor, and the control device determines the distance according to the smallest number of all the second signals; alternatively, the first and second electrodes may be,

the higher the mounting height, the smaller the number of the first sensor, and the control device determines the distance from the largest number of all the second signals.

10. A carton placement system according to claim 1, wherein said distance measuring device comprises a second sensor that emits laser light toward the bottom surface of the item and receives laser light reflected from the bottom surface of the item to detect said distance.

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