KR20150137382A - Carrying apparatus - Google Patents

Abstract

Disclosed is a transfer device. The transfer device according to the present invention comprises: a tray combined with or accommodating an article and having a magnet shaft formed at a lower end part; a roller for transmitting a rotating force to the tray so that the tray can be transferred; and a magnet supporter installed below the tray and forming a repulsive force caused by a magnetic force between the magnetic shaft and the magnet supporter, wherein a force transmitted to the roller from the tray is reduced by the repulsive force between the magnet shaft and the magnet supporter. According to the present invention, provided can be a transfer device wherein the reduced load of the tray is transmitted to the roller even if the self-load of the tray is not reduced, and the separation of the tray is prevented even if a shock caused by the outside or the malfunction of the device is exerted on the transfer device or a guide device.

Description

CARRYING APPARATUS

The present invention relates to a transfer device, and more particularly, to a transfer device in which a tray to which a part or a product is coupled or received is placed on a roller in a state in which a load is reduced by a repulsion force between magnets, .

A carrying apparatus refers to a device in which a number of components are combined for the purpose of transporting goods, and is mainly used in a factory or a place where a large number of articles such as an airport are transported.

Various types of transfer devices are used in the production line of the factory depending on the type, size and characteristics of the parts and products to be produced. The transfer device used for transferring the parts susceptible to contamination or impurity contamination, such as an LCD glass substrate, So that the trays to which the components are coupled are conveyed along the installation direction of the rollers while they are seated on the rotating rollers.

Korean Patent Registration No. 646,943 discloses a tray guiding device, and Japanese Patent Publication No. 646,943 discloses a tray having a granular tray to be transported by a transporting device, and a pair of upper and lower surfaces of the tray, And a guide unit configured to be selectively in contact with the roller.

Korean Patent Publication No. 646,943 discloses that the swinging motion of the upper portion of the tray conveyed to the granular phase is removed by the support of the roller and the abrasion of a part of the tray is prevented and the tray is stably supported by the roller, There is an advantage of speeding up.

However, in the conventional conveying device or guide device including the Korean Patent Publication No. 646,943, since the rotating roller is supported by most of the load of the tray to which the component or the product is coupled, friction occurs between the stiffener and the roller When slippage occurs, the roller or the LCD substrate is subject to shaking or impact, which shortens the life of the roller rapidly or generates particles, thereby increasing the defective occurrence rate of the LCD glass substrate.

In addition, since the lower end of the tray is supported only by a roller that rotates at the lower side of the stiffener, the conventional conveying device or guide device including the Korean Patent Publication No. 646,943 has a certain level There has been a problem that the tray is disengaged from the roller.

(0001) Korean Patent Registration No. 646,943 (Registered on November 11, 2006)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a conveyance apparatus and a conveyance apparatus which prevent a drop of a tray even when a load of a reduced tray is transmitted to a roller even if a self- .

The object is achieved according to the present invention by a method of manufacturing a magnetic recording medium, comprising: a tray to which an article is coupled or received and a magnet shaft is formed at a lower end; A roller for transmitting a rotational force to the tray so that the tray is transferred; And a magnet supporter provided below the tray and forming a repulsive force by magnetic force with the magnet shaft, wherein a force transmitted from the tray to the roller is transmitted to the roller by a repulsive force between the magnet shaft and the magnet supporter When the transporting device is operated.

The magnet shaft is elongated in the conveying direction of the tray, the roller supports the magnet shaft, and the magnet supporter can be alternately installed with the roller.

Wherein the magnet supporter includes a supporter body and a first magnet installed on a first installation space inside the supporter body, the magnet shaft includes a shaft body and a first member provided on a second installation space inside the shaft body 2 < / RTI > magnet.

Wherein the magnet supporter is provided with a first opening portion which is opened or closed by a first cover so that the first magnet is installed on or separated from the first installation space and the second magnet is mounted on the second installation space And a second opening that is opened or closed by the second cover may be formed on the second cover.

At least one of the first magnet and the second magnet may be installed to be rotatable or movable in the first installation space or the second installation space by a repulsive force between the first magnet and the second magnet.

The lubricant is filled in the first installation space or the second installation space in which the first magnet or the second magnet is rotatably or movably installed so that the rotational speed or the moving speed of the first magnet or the second magnet is delayed .

In at least one of the supporter body and the magnet shaft, elastic means may be interposed between the supporter body and the first magnet or between the shaft body and the second magnet.

Wherein the elastic means comprises a first elastic means and a second elastic means spaced apart from each other between the supporter body and the first magnet or between the shaft body and the second magnet and the first elastic means and the second The elastic means may be deformed at different strains by a change in the repulsive force between the first magnet and the second magnet when the tray is moved.

The above objects are achieved by a transfer device according to the present invention, further comprising a magnet guider formed on both sides of the magnet shaft along a conveying direction of the tray, and forming a repulsive force by magnetic force with the magnet shaft.

According to the present invention, there is provided a tray comprising: a tray to which an article is coupled or received, and a magnet shaft is formed at a lower end; A roller for transmitting a rotational force to the tray so that the tray is fed; And a magnet supporter which is installed under the tray and forms a repulsive force by magnetic force with the magnet shaft and the force transmitted from the tray to the roller is reduced by the repulsion force between the magnet shaft and the magnet supporter, It is possible to provide a conveying apparatus in which the load of the reduced tray is transmitted to the rollers even if the self-load of the tray is not reduced.

In addition, since the magnetic guider is formed on both sides of the magnet shaft along the transport direction of the tray and forms a repulsive force by the magnetic force with the magnet shaft, It is possible to provide a conveyance device in which separation of the tray is prevented even if the tray is applied.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A and FIG. 1B are views showing the entire configuration of a transfer device according to an embodiment of the present invention;
2A and 2B are views showing a partial configuration of a transfer apparatus according to an embodiment of the present invention;
FIGS. 3A and 3B illustrate a magnet shaft and a magnet supporter of a transfer device according to an embodiment of the present invention; FIGS.
4 is a view showing a magnet shaft and a magnet supporter of a transfer device according to another embodiment of the present invention.
5 shows a conveying device according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, the well-known functions or constructions are not described in order to simplify the gist of the present invention.

The conveying apparatus of the present invention is configured so that the tray is prevented from being separated from the tray even when the load of the tray is reduced and the load of the reduced tray is transmitted to the roller and an impact is exerted on the conveying device or the guide device due to external or malfunction of the device.

FIGS. 1A and 1B are views showing the overall configuration of a transfer apparatus according to an embodiment of the present invention. FIGS. 2A and 2B are views showing a partial configuration of a transfer apparatus according to an embodiment of the present invention, Fig. 4 is a view showing a magnet shaft and a magnet supporter of a conveyance apparatus according to another embodiment of the present invention, Fig. 5 is a view showing the magnet shaft and the magnet supporter of the present invention ≪ RTI ID = 0.0 > a < / RTI >

1A and 2B, a conveying apparatus 1 according to an embodiment of the present invention is configured such that a tray 10 is seated on a roller 30 in a state in which a load is reduced by a repulsive force between magnets, 30, and includes a tray 10, a magnet shaft 20, a roller 30, and a magnet supporter 40. The tray 10, the magnet shaft 20, the roller 30,

The tray 10 is a configuration in which articles are combined or received, and an existing tray can be used as it is. Hereinafter, the tray 10 is used to transfer an LCD glass substrate (not shown) coupled to a television or a smartphone. Of course, the parts or products to be coupled to the tray 10 are not limited to the LCD glass substrate, and the shape of the tray 10 can be variously changed depending on the type, size, and characteristics of parts and products.

As shown in Figs. 1A to 3B, the magnet shaft 20 is configured to be engaged with the lower end of the tray 10 and to contact the roller 30, and is formed long along the conveying direction of the tray 10. The magnet shaft 20 is seated on the roller 30 which rotates when the tray 10 is fed and receives the force in the conveying direction from the roller 30. [ The magnet shaft 20 is preferably formed in a cylindrical shape along the conveying direction of the tray 10, and a detailed description thereof will be given later with a description of the magnet supporter 40.

The roller 30 has a structure in which a rotational force is transmitted to the tray 10 so that the tray 10 is fed and the center of the outer circumferential surface of the roller 30 rotates in the circumferential direction As shown in FIG.

The magnet supporter 40 is disposed below the tray 10 so as to be spaced apart from the magnet shaft 20 and forms a repulsive force with the magnet shaft 20 by magnetic force. And the roller 30 are alternately installed.

In a conventional conveying apparatus, when a roller or a slider is caused to rotate between a roller and a stiffener such as a magnet shaft during driving of the roller, There is a problem that the lifetime of the roller is rapidly shortened or particles are generated and the incidence of defective of the LCD glass substrate is increased.

The conveying apparatus 1 of the present invention forms a repulsive force between the magnet shaft 20 and the magnet supporter 40 by the magnetic force during the feeding of the tray 10 to reduce the load applied from the tray 10 to the roller 30 Thereby solving the problems as described above.

Hereinafter, the magnet supporter 40 and the magnet shaft 20 will be described together to facilitate a better understanding of the technique that the magnet supporter 40 and the magnet shaft 20 form repulsive force with each other.

2A to 3B, the magnet supporter 40 includes a supporter body 41, a first magnet M1, and a first cover 42. The magnet shaft 20 includes a shaft body A first magnet 21, a second magnet M2, and a second cover 22.

The shaft body 21 is formed in a long cylindrical shape along the conveyance direction of the tray 10 and includes a coupling portion 21a and a magnetic force portion 21b. The shaft body 21 may be formed of a material having a high hardness because abrasion due to friction with the roller 30 may occur.

The engaging portions 21a are engaged with the lower end of the tray 10 and are preferably formed at regular intervals along the longitudinal direction of the shaft body 21. [ The engaging portion 21a is fastened to the lower end of the tray 10 by a fastening member such as a bolt.

The magnetic force portion 21b is a portion where the second magnet M2 is installed and is alternately formed with the engaging portion 21a along the longitudinal direction of the shaft body 21. [ The second installation space 20a in which the second magnet M2 is inserted is formed in the magnetic portion 21b in the shape of a long groove along the longitudinal direction of the shaft body 21. [

The second magnet M2 is constituted to generate a magnetic force and is provided as a permanent magnet. The second magnet M2 is formed into a long shape in the horizontal direction in a state in which the N pole and the S pole are formed in the vertical direction so as to form a repulsive force with the first magnet M1 in a longer section along the length of the shaft body 21 .

The second magnet M2 is inserted into the second installation space 20a through the second opening 20b and the second installation space 20a is formed in the second opening 20b in order to prevent the second magnet M2 from flowing. The second cover 22 is opened or closed. And the second cover 22 and the magnetic force portion 21b are fastened by a fastening member such as a bolt.

2A to 3B, the supporter body 41 of the magnet supporter 40 is formed to be long along the conveyance direction of the tray 10, and the lower end of the supporter body 41 is fixed to the paper surface or the fixing body L And the first magnet M1 is installed inside. The first installation space 40a in which the first magnet M1 is inserted is formed in the supporter body 41 in the shape of a long groove along the longitudinal direction of the supporter body 41. [

The first magnet M1 is constituted to generate a magnetic force and is provided as a permanent magnet. The first magnet M1 is disposed in a state in which the N pole and the S pole are disposed in the opposite direction to the second magnet M2 so as to form a repulsive force with the second magnet M2 in a longer section along the conveying direction of the tray 10 It is preferable to form a long shape in the left-right direction.

The first magnet M1 is inserted into the first installation space 40a through the first opening 40b and the first installation space 40a is formed in the first opening 40b to prevent the first magnet M1 from flowing. The first cover 42 is opened or closed. The first cover 42 and the magnetic force portion 21b are fastened by a fastening member such as a bolt.

When there are two magnets, the stronger the magnetic force between the two magnets is, the stronger the magnetic force between the two magnets becomes. Also, even though the magnets have the same distance, the magnetic force is stronger as the magnitude of the magnet increases (the stronger the magnetism is).

That is, the repulsive force between the first magnet M 1 and the second magnet M 2 can be adjusted according to the magnitude of the magnetic force or can be adjusted by the gap between the first magnet M 1 and the second magnet M 2. Of course, the repulsive force between the two magnets must be adjusted according to the load of the tray 10 to which the LCD glass substrate (not shown) is coupled, and the trembling between the magnet shaft 20 and the roller 30 due to the excessive load of the tray 10 Or about 50% of the load of the tray 10 to which the glass substrate is coupled so that the slip phenomenon is prevented.

Accordingly, when the interval between the first magnet M1 and the second magnet M2 is shortened, permanent magnets of smaller magnetism can be used as the first magnet M1 and the second magnet M2.

That is, as shown in the embodiment of the present invention, when the first opening 40b is formed on the upper side, it is preferable that the first installation space 40a extends toward the first cover 42, (42) is formed with a groove into which the upper portion of the first magnet (M1) is inserted so as to extend the first installation space (40a).

2A to 3B, a magnet shaft 20 coupled with a tray 10 is conveyed together with a tray 10, and a plurality of magnet supporters 40 alternately installed with the roller 30 in the course of conveyance, And repulsive force. A plurality of magnet supporters 40 are provided with a first magnet M1 having the same magnetism and a second magnet M2 having the same magnetism is provided for each magnetic force portion 21b in the magnet shaft 20. Accordingly, the repulsive force by the magnetic force between the magnet shaft 20 and the magnet supporter 40 is kept constant during the feeding of the tray 10.

1A and 2B, an arrangement interval (hereinafter referred to as a "first gap") between the first magnets M1 of the plurality of magnet supporters 40 and a spacing distance between the second magnets M2 of the magnet shaft 20 (Hereinafter referred to as a 'second interval') is preferably a divisor of the other.

For example, when the first interval is 100CM and the second interval is 50CM, the second interval is a divisor of the first interval, so that the distance between the first magnet M 1 and the second magnet M 2 along the length direction of the magnet shaft 20 The repulsive force is constant and the load of the tray 10 supported by each roller 30 is kept constant.

At least one of the distance between the end portions of the first magnet M1 (hereinafter referred to as a "first distance") and the distance between the end portions of the second magnet M2 (hereinafter referred to as a "second distance" The length of the first magnet M1 and the length of the second magnet M2 may be shorter than the length of the second magnet M2.

For example, if the first distance is 40CM, the second distance is 30CM, the first magnet M1 is 100CM, and the second magnet M2 is 120CM, one of the second magnets M2 must be the first magnet M1 So that the load of the tray 10 is dispersed by the repulsive force during the process of transporting the tray 10.

Referring to FIGS. 1A and 2B, the second magnet M2 moves on the upper side of the plurality of first magnets M1 in the process of conveying the tray 10, The repulsive force generated between the first magnet M1 and the second magnet M2 is changed by the second distance.

That is, when the front side (in the moving direction) of the second magnet M2 is located between the second distances, the repulsive force in the vertical direction is not formed between the second distances and the front side of the second magnet M2 is not in contact with the first magnet The second magnet M2 and the rear side of the first magnet M1 form a repulsive force in the up and down directions while the second magnet M2 and the first magnet M1 move in the vertical direction It is impossible to form a repulsive force in the vertical direction.

Therefore, the magnitude of the repulsive force formed by one of the first magnet M1 and the second magnet M2 varies in the process of conveying the tray 10, and the load supported by the roller 30 is in the form of a sinusoidal curve Change.

4A, any one or more of the first magnet M1 and the second magnet M2 may be attached to the first installation space 40a by the repulsive force between the first magnet M1 and the second magnet M2, Or the second installation space 20a so that the load supported by the roller 30 can be kept constant. In the following description, it is assumed that the second magnet M2 is installed so as to be movable up and down in the second installation space 20a.

The vertical length of the second installation space 20a is longer than the vertical length of the second magnet M2 so that the second magnet M2 can move up and down by a repulsive force with the first magnet M1, The magnet M2 moves in the vertical direction in accordance with the change of the repulsive force with the first magnet M1.

This minimizes the amplitude of the repulsive force in which one of the first magnet M1 and the second magnet M2 is formed in a sinusoidal shape in the process of conveying the tray 10, 10 are kept constant.

The side surface of the second magnet M2 is arranged in the second installation space 20a so that the fluid in the second installation space 20a moves upward or downward of the second magnet M2 when the second magnet M2 moves up and down. A gap is formed at a certain interval from the side surface of the substrate.

The lubricant R may be filled in the second installation space 20a such that the moving speed of the second magnet M2 is delayed and the lubricant R may be filled in the second installation space 20a between the side surface of the second magnet M2 and the inner surface of the second installation space 20a The moving speed of the second magnet M2 in the vertical direction can be adjusted.

4b, any one or more of the first magnet M1 and the second magnet M2 may be attached to the first installation space 40a by a repulsive force between the first magnet M1 and the second magnet M2, Or the second installation space 20a, the load supported by the roller 30 can be kept constant. In the following description, it is assumed that the second magnet M2 is rotatably installed in the second installation space 20a.

The center of the second magnet M2 is rotatably coupled to the magnet shaft 20 in the second installation space 20a by the rotation axis A and the second magnet M2 is rotated by the first And is rotated in a clockwise or counterclockwise direction within a certain angle in accordance with the change of the repulsive force with the magnet M1. This minimizes the amplitude of the repulsive force that the first magnet M1 and the second magnet M2 form in a sinusoidal curve in the process of conveying the tray 10, 10 are kept constant.

The side surface of the second magnet M2 is disposed in the second installation space 20a so that the fluid in the second installation space 20a moves upward or downward of the second magnet M2 when the second magnet M2 rotates. A gap with a predetermined gap is formed between the side surfaces. The second installation space 20a may be filled with the lubricant R so that the rotation speed of the second magnet M2 is delayed. The rotation speed of the second magnet M2 can be adjusted by adjusting the gap between the side surface of the second magnet M2 and the inner surface of the second installation space 20a.

4C, the conveying apparatus 1 according to another embodiment of the present invention includes a supporter body 41 and a magnet shaft 20, and the supporter body 41 and the first magnet The load supported by the roller 30 is kept constant by interposing the elastic means E between the shaft body 21 and the second magnet M2. In the following description, it is assumed that the elastic means E is installed in the second installation space 20a.

The elastic means E is installed on the upper side of the second magnet M2 in the second installation space 20a and the second magnet M2 is mounted on the elastic means E in the up and down direction due to the elastic deformation. Accordingly, it is possible to minimize the amplitude of the repulsive force of the first magnet M1 and the second magnet M2 formed in a sinusoidal shape during the feeding of the tray 10, 10 are kept constant. Of course, the resilient means E may be installed in the second installation space 20a below the second magnet M2.

The elastic means E can be variously applied to compression springs, tension springs, compressible fluids and the like, and the moving speed of the second magnet M2 in the up and down direction can be adjusted according to the elasticity of the elastic means E.

4d, the resilient means E includes a first resilient member 41 interposed between the supporter body 41 and the first magnet M1, or between the shaft body 21 and the second magnet M2, Means E1 and second elastic means E2.

The first elastic means E1 and the second elastic means E2 are deformed to different strain rates by the change of the repulsive force between the first magnet M1 and the second magnet M2 when the tray 10 is moved, The magnet M2 is moved in the vertical direction while being rotated.

The conventional conveying apparatus has a problem that when the lower end of the tray is supported only by the roller which rotates at the lower side of the reinforcing member and the impact is applied to the conveying apparatus by an external or a device malfunction,

5, the conveying device 1 according to another embodiment of the present invention is provided with the magnet shaft 20 on both sides of the magnet shaft 20 along the conveying direction of the tray 10, And a magnet guider 50 that forms a repulsive force by the magnet guider 50. The above-described problem is solved.

The magnet guider 50 includes a guider body 51 and a third magnet M3. The guider body 51 is formed on both sides of the magnet shaft 20 in the conveying direction, and one end of each guider body 51 faces the magnet shaft 20 in a horizontal direction.

The third magnet M3 is provided at one end of the guider body 51 and the third magnet M3 is opposed to the third magnet M3 of the magnet shaft 20 by a magnetic repulsive force The fourth magnet M4 is installed. Therefore, even if a certain level or more of impact is applied to the conveying apparatus 1 due to external or malfunction of the apparatus, the deviation of the tray 10 from the roller 30 by the repulsive force between the third magnet M3 and the fourth magnet M4 .

In the conventional conveying apparatus, both side surfaces of the tray upper end are supported by the rollers along the conveying direction of the tray, friction or slippage occurs on the roller and the tray upper end, impact is applied to the LCD glass substrate, There is a problem that the LCD glass substrate is contaminated.

Although not shown, the magnet guider 50 is further provided on both sides of the upper end of the tray 10 along the conveying direction of the tray 10 so that the upper end of the tray 10 and the upper end of the tray 10 are urged May be formed. A fifth magnet (not shown) is formed on the upper end of the tray 10 to form a repulsive force with the third magnet M3.

When the magnet guider 50 is further provided on the upper end of the tray 10, there is an advantage that friction or slipping is prevented at the upper end of the tray 10 as the side surface of the upper end of the tray 10 is supported in a noncontact manner.

According to the present invention, there are provided a tray 10 to which an article is coupled or received, and a magnet shaft 20 is formed at a lower end thereof; A roller (30) for transmitting rotational force to the tray (10) so that the tray (10) is fed; And a magnet supporter 40 which is provided below the tray 10 and forms a repulsive force with the magnet shaft 20 by a magnetic force so that the force transmitted from the tray 10 to the roller 30 The load of the reduced tray 10 is transmitted to the roller 30 even if the self-load of the tray 10 is not reduced as the repulsive force between the magnet shaft 20 and the magnet supporter 40 is reduced, (1).

In addition, since the magnet guider 50 is formed on both sides of the magnet shaft 20 along the conveying direction of the tray 10 and forms a repulsive force with the magnet shaft 20 by the magnetic force, It is possible to provide the conveying apparatus 1 in which the tray 10 is prevented from falling off even if the apparatus 1 or the guide apparatus is subjected to an impact due to external or malfunction of the apparatus.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is obvious to those who have. Accordingly, it should be understood that such modifications or alterations should not be understood individually from the technical spirit and viewpoint of the present invention, and that modified embodiments fall within the scope of the claims of the present invention.

1: Feeder 10: Tray
20: Magnet shaft 30: Roller
40: Magnet supporter 50: Magnet guider
21: shaft body 41: supporter body
22: second cover 42: first cover
20a: second installation space 40a: first installation space
20b: second opening portion 40b: first opening portion
M2: second magnet M1: first magnet
E: Elastic means
E1: first elastic means
E2: second elastic means
R: Lubricant

Claims (9)

A tray to which the article is coupled or received, and a magnet shaft is formed at a lower end thereof;
A roller for transmitting a rotational force to the tray so that the tray is transferred; And
And a magnet supporter provided below the tray and forming a repulsive force by magnetic force with the magnet shaft,
Wherein a force transmitted from the tray to the roller is reduced by a repulsive force between the magnet shaft and the magnet supporter. The method according to claim 1,
Wherein the magnet shaft is elongated in a conveying direction of the tray,
The roller supporting the magnet shaft,
Wherein the magnet supporter is installed alternately with the roller. The method according to claim 1,
Wherein the magnet supporter includes a supporter body and a first magnet installed on a first installation space inside the supporter body,
Wherein the magnet shaft includes a shaft body and a second magnet disposed on a second installation space inside the shaft body. The method of claim 3,
Wherein the magnet supporter is provided with a first opening that is opened and closed by a first cover so that the first magnet is installed on or separated from the first installation space,
Wherein the magnet shaft is formed with a second opening that is opened or closed by a second cover so that the second magnet is installed on or separated from the second installation space. The method of claim 3,
Wherein at least one of the first magnet and the second magnet is installed to be rotatable or movable in the first installation space or the second installation space by a repulsive force between the first magnet and the second magnet Conveying device. 6. The method of claim 5,
The first installation space or the second installation space in which the first magnet or the second magnet is rotatably or movably installed is filled with a lubricant such that the rotational speed or the moving speed of the first magnet or the second magnet is delayed And a conveying device for conveying the sheet. The method of claim 3,
Wherein at least one of the supporter body and the magnet shaft is provided with elastic means between the supporter body and the first magnet or between the shaft body and the second magnet. 8. The method of claim 7,
The elastic means includes first and second elastic means spaced apart from each other between the supporter body and the first magnet or between the shaft body and the second magnet,
Wherein the first elastic means and the second elastic means are deformed at different strains by a change in the repulsive force between the first magnet and the second magnet when the tray is moved. The method according to claim 1,
Further comprising: a magnet guider formed on both sides of the magnet shaft along a conveying direction of the tray, the magnet guider forming a repulsive force by the magnetic force with the magnet shaft.

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