KR102529706B1 - MLCC arraying apparatus - Google Patents

Abstract

The present invention relates to an MLCC alignment device, comprising: a part feeder disposed on a fixed block to transport MLCCs along a conveying path; and an MLCC disposed on an upper part of the fixed block spaced apart from the part feeder and located inside the parts feeder. It includes multiple magnetic flux generating heads that are converted and aligned in a direction in which magnetic resistance is reduced, and the multiple magnetic flux generating heads include a fixed bracket disposed above the fixed block and spaced apart from the part feeder, and disposed below the fixed bracket to form a part feeder. Multiple holders located inside, and a plurality of MLCCs located inside the part feeder, arranged spaced apart at regular intervals with the N poles of each N pole and S pole facing downward in the multiple holders, in the direction of decreasing magnetic resistance. It is characterized in that it includes a plurality of magnets for switching, and a cylinder transfer mechanism disposed between the fixing bracket and the multi-holder to raise and lower the multi-holder at regular intervals in the vertical direction.

Description

MLCC arraying apparatus {MLCC arraying apparatus}

The present invention relates to an MLCC aligning device, and in particular, when an MLCC enters or enters a conveyance path of a part feeder, internal electrode layers included in a plurality of MLCCs are positioned horizontally to each other before entering the conveyance path so that they are adjacent to each other. An MLCC aligning device capable of aligning MLCCs by changing the direction of the MLCCs so that they are positioned in a direction with reduced magnetoresistance without interference between the MLCCs.

A multi-layer ceramic capacitor (MLCC) is mounted on a printed circuit board such that the arrangement direction of internal electrode layers disposed therein is constant. MLCC may generate acoustic noise due to vibration due to a piezo effect when a voltage is applied when the surface of the inner electrode layer is disposed to be parallel to the surface of the printed circuit board. In the MLCC, since the surface of the inner electrode layer is disposed perpendicular to the surface of the printed circuit board, generation of the piezo effect can be prevented by application of voltage. When MLCC is transported using a hopper and a feeder after manufacturing is completed, alignment is performed using a magnetic material so that the surface of the inner electrode layer is positioned in a direction perpendicular to the surface of the printed circuit board in advance to prevent the above-mentioned piezo effect during packaging. will do The MLCC alignment method is arranged using the principle that when a magnet is placed close to the MLCC, the internal electrode layer is attached in the direction of reducing magnetic resistance. A technology for aligning MLCCs using a conventional MLCC alignment method using magnets is disclosed in Korean Patent Registration No. 10-0636871 (Patent Document 1).

Patent Document 1 relates to a multilayer electronic component alignment device, and is configured to include a component feeder, a magnetic field generating unit, and a means for applying electricity. The component feeder provides a conveyance path through which a plurality of laminated electronic components are supplied in a row, and includes a bowl having a side wall portion having an outer circumferential surface and an inner circumferential surface in which a bottom portion and a spiral passage are formed, wherein the bottom portion and the spiral passage are conveyed. function as The magnetic field generator is disposed on the outer rear surface of the component feeder and applies either a vertical magnetic field or a horizontal magnetic field to the multilayer electronic components moving on the transport path, and the means for applying electricity is a first electromagnet disposed outside the spiral passage in the radial direction. and a second electromagnet disposed below the bowl.

A conventional laminated electronic component alignment device, that is, an MLCC alignment device, such as Patent Document 1 reduces magnetic resistance by applying a magnetic field to a magnetic field generating unit, that is, a magnetic field where a magnet is disposed on the outer rear surface of a component feeder and transferred along a conveyance path. The direction of the MLCC is aligned and transferred. In the above-described conventional MLCC alignment device, magnets are disposed on the outer rear surface of the part feeder to change the direction of MLCCs transported along the conveying path, which is a spiral path formed in the ball, and transfer them, but the MLCCs transferred along the conveying path are in contact with each other. are transferred continuously. In the conventional MLCC alignment device, while a plurality of MLCCs are continuously transferred while being in contact with each other, the magnets are aligned by changing the direction of the MLCCs in the direction in which the magnetic resistance decreases, and then transferred. There is a problem that an error may occur in directional alignment of the MLCC.

: Korea Patent Registration No. 10-0636871

An object of the present invention is to solve the above-mentioned problem, by entering the conveying path in a state where the inner electrode layers included in each of a plurality of MLCCs are positioned horizontally with each other before the MLCC enters or enters the conveying path of the parts feeder. It is an object of the present invention to provide an MLCC aligning device capable of aligning MLCCs by changing the direction of the MLCCs so that they are positioned in a direction in which magnetoresistance is reduced without interference between MLCCs adjacent to each other.

Another object of the present invention is to prevent adjacent MLCCs from being disturbed by rotation of MLCCs by changing the direction of MLCCs so that they are positioned in a direction with reduced magnetoresistance without interference between MLCCs adjacent to each other, thereby stably aligning MLCCs. It is to provide an MLCC alignment device capable of conveying.

The MLCC aligning device of the present invention includes a component feeder disposed on a fixed block to transport a multi-layer ceramic capacitor (MLCC) along a transport path, and a component feeder disposed on an upper portion of the fixed block to be spaced apart from the component feeder. It includes a multiple magnetic flux generating head that aligns MLCCs located inside by converting them in a direction in which magnetic resistance is reduced, wherein the multiple magnetic flux generating head includes a fixing bracket disposed on top of the fixing block and spaced apart from the part feeder; Multiple holders disposed at the bottom of the fixed bracket and located inside the part feeder, and the N poles of each N (N) pole and S (S) pole in the multiple holders are arranged spaced apart at regular intervals toward the lower side A plurality of magnets that convert a plurality of MLCCs located inside the part feeder in a direction in which magnetic resistance is reduced, and a cylinder transfer disposed between the fixing bracket and the multi-holder to raise and lower the multi-holder at regular intervals in the vertical direction. Characterized in that it includes a mechanism.

The MLCC aligning device of the present invention enters into the conveying path in a state where the inner electrode layers included in each of the plurality of MLCCs are positioned horizontally with each other before the MLCC enters or enters the conveying path of the parts feeder, thereby causing interference between adjacent MLCCs. There is an advantage in that the direction of the MLCCs can be reversed and aligned so that the direction of the MLCCs is positioned in the direction of reduced magnetoresistance without any interference between adjacent MLCCs. There is an advantage in that the MLCCs can be stably aligned and transported by preventing the adjacent MLCCs from being disturbed by the rotation of .

1 is a plan view of an MLCC alignment device of the present invention;
Figure 2 is a side view of the MLCC alignment device shown in Figure 1
3 is a perspective view of an MLCC positioned in a direction in which magnetoresistance increases among the MLCCs shown in FIG. 1;
4 is a side view of the MLCC shown in FIG. 3;
5 is a side view of an MLCC showing a state in which the MLCC shown in FIG. 4 is rotated in a direction in which magnetic resistance decreases;
6 is a side view of an MLCC in a state in which the MLCC shown in FIG. 5 is completely rotated in a direction in which magnetoresistance is reduced;

Hereinafter, an embodiment of the MLCC alignment device of the present invention will be described with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, the MLCC alignment device of the present invention includes a fixed block 110, a part feeder 120, and a multi-magnetic flux generating head 130.

The fixed block 110 generally supports the MLCC alignment device of the present invention, and the part feeder 120 is disposed on the upper part of the fixed block 110 to transfer the multi-layer ceramic capacitor (MLCC) 10 to the conveying path 123. ), and the multi-magnetic flux generating head 130 is disposed on the top of the fixing block 110 to be spaced apart from the part feeder 120, and the magnetic resistance of the MLCC 10 located inside the part feeder 120 Sort by switching in the decreasing direction.

A specific embodiment of the MLCC alignment device of the present invention will be described.

The fixed block 110 is formed as a cylindrical block as shown in FIGS. 1 and 2, and the part feeder 120, the multiple magnetic flux generating head 130, and the linear feeder 140 are disposed spaced apart from each other. That is, the part feeder 120 is disposed on the upper part of the fixed block 110 based on the center, and the part feeder 120 is spaced apart from the multiple magnetic flux generating head 130 is disposed, and the part feeder 120 and the multiple magnetic flux A linear feeder 140 is disposed to be spaced apart from the generating head 130.

As shown in FIGS. 1 and 2, the part feeder 120 includes a bowl feeder 121 and an electric motor 122.

The ball feeder 121 is disposed on the upper side of the fixed block 110 to receive the MLCC 10 from the outside and align and convey it to the conveying path 123, and the conveying path 123 is formed at the inner edge of the motor ( The vibration and rotation of 122 cause the MLCC 10 to be transported. This conveyance path 123 is formed inside the ball feeder 121 in a spiral shape. The end 123a of one side of the transport path 123 is arranged so that the center of the lower surface of the multiplex holder 132 of the multiple magnetic flux generating head 130 is aligned, and the number of magnets 133 disposed in the multiple holder 132 The N (N) pole of the MLCC 10 positioned at the end 123a on one side of the conveying path 123 causes the magnetic resistance to be switched in the decelerating direction. The other end 123b of the transport path 123 is linearly transported by the linear feeder 140 so that the MLCC 10 transported along the transport path 123 is transported to the linear transport path 141 of the linear feeder 140. It is connected to the end of one side of the furnace 141. The electric motor 122 is disposed on the upper side of the fixing block 110 to be located on the lower side of the ball feeder 121 so that the MLCC 10 located inside the ball feeder 121 is transported along the conveying path 123 The ball feeder 121 is rotated while vibrating, and a detailed description is omitted as the resonant technology is applied.

As shown in FIGS. 1 and 2 , the multi-magnetic flux generating head 130 includes a fixing bracket 131 , a multi-holder 132 , a plurality of magnets 133 and a cylinder transfer mechanism 134 .

The fixing bracket 131 is disposed above the fixing block 110 to be spaced apart from the part feeder 120 to support the multiple magnetic flux generating head 130, and includes a vertical member 131a and a horizontal member 131b. do. The vertical member 131a is disposed above the fixing block 110. That is, the vertical member 131a is disposed to be spaced apart from the part feeder 120 while being fixed to the upper portion of the fixing block 110, and the upper side is formed to extend higher than the upper portion of the ball feeder 121 in the vertical direction. The horizontal member (131b) is connected to the upper portion of the vertical member (131a) and the magnet 133 is connected to one side. That is, one end of the horizontal member 131b extends in the horizontal direction from the top of the vertical member 131a to pass through the top of the ball feeder 121 and is positioned inside the ball feeder 121.

The multiple holder 132 is disposed under the fixing bracket 131 and is located inside the part feeder 120. That is, the multi-holder 132 is connected to the lower part of the fixing bracket 131 so as to move up and down from the inside of the part feeder 120 . The multi-holder 132 has a cylinder transfer mechanism 134 connected to the upper portion, and is moved up and down in a vertical direction at a constant height by the cylinder transfer mechanism 134, and a plurality of insertion grooves 132a into which magnets are inserted at the bottom are constant. It is formed to be spaced apart at intervals and arranged in L×K, and L and K are each a natural number greater than 1. For example, multiple holders 132 are formed by arranging 2×3 as shown in FIG. 1 .

A plurality of magnets 133 are arranged spaced apart at regular intervals with the N pole of each N (N) pole and S (S) pole facing downward in the multi-holder 132 and located inside the part feeder 120 The plurality of MLCCs 10 are switched in a direction in which magnetic resistance is reduced. That is, the plurality of magnets 133 are inserted into the insertion groove 132a formed in the multiple holder 132 with the N pole of the N pole and the S pole facing downward, and are arranged in an L×K arrangement, and L and K are Each is a natural number greater than 1, and the magnetic resistance of the MLCC 10 in which the lower part of the N pole is located inside the part feeder 120 in a state where each is inserted into the multiple holder 132 by the magnet 133 is reduced The MLCC 10 located on the top of the MLCC 10 located inside the part feeder 120 is moved up and down from the height at which it is aligned and switched in the direction in which the magnetic resistance is reduced to the height at which it is aligned. Here, the plurality of magnets 133 arranged and arranged in L×K are connected in parallel to each other and arranged to have L×K polarities to generate lines of magnetic force to the plurality of MLCCs 10 located inside the part feeder 120. generated to rotate the MLCC 10 according to the direction between the inner electrode layer 13 of the MLCC 10 and the line of magnetic force.

The cylinder transfer mechanism 134 is disposed between the fixing bracket 131 and the multi-holder 132 to raise and lower the multi-holder 132 to a certain height in the vertical direction, and a pneumatic cylinder is used as the cylinder transfer mechanism 134. . For example, in the cylinder transfer mechanism 134, the lower part of each N pole of the plurality of magnets 133 is positioned in contact with the part feeder 20 on the inside of the part feeder 120, and the MLCC 10 has reduced magnetic resistance. The MLCC 10 located on top of the MLCC 10 located inside the part feeder 120 is moved up and down from the height aligned in the direction of turning in the direction of decreasing magnetic resistance to the height aligned.

As shown in FIGS. 1 and 2, the linear feeder 140 is a linear transport path 141 that guides the MLCC 10 that is transported and discharged along the transport path 123 on one side of the part feeder 120 to be transported in a straight line. ) is formed.

The operation according to the configuration of the MLCC alignment device of the present invention will be described.

In the MLCC alignment device, a plurality of MLCCs 10 introduced into the ball feeder 121 in a state in which the ball feeder 121 of the part feeder 120 is vibrated and rotated by the motor 122 are shown in FIGS. It can be located in the state of 6. The MLCC 10 shown in FIG. 4 is located inside the ball feeder 121 so as to be perpendicular to the magnetic force generated from the plurality of magnets 133 of the multiple magnetic flux generating head 130, and shown in FIG. The MLCC 10 is located inside the ball feeder 121 so as to be opposite to the magnetic force generated from the plurality of magnets 133 of the multiple magnetic flux generating head 130, and the MLCC 10 shown in FIG. It is a state located inside the bowl feeder 121 to be horizontal with the magnetic force generated from the plurality of magnets 133 of the multiple magnetic flux generating head 130.

The MLCC 10 shown in FIGS. 4 to 6 will be described in detail as follows. The MLCC 10 shown in FIG. 4 is located inside the ball feeder 121 in a direction in which the magnetic resistance is reduced, and is positioned perpendicular to the magnetic force to maintain a stable state, but is moved by the vibration of the motor 122. In this state, if the plurality of magnets 133 are approached by lowering them to a certain height, they can more easily rotate to the state of FIG. 5 and change the direction to the state of FIG. 6.

The MLCC 10 shown in FIG. 5 is located inside the ball feeder 121 in a previous state for being rotated in a direction for reducing magnetic resistance, and in a state of moving by vibration of the motor 122, a plurality of When the magnet 133 is lowered to a certain height and approached, the direction can be changed to the state of FIG. 6 more easily than the MLCC 10 shown in FIG. 4 .

The MLCC 10 shown in FIG. 6 is located inside the bowl feeder 121 in a direction in which the magnetic resistance is reduced, and is positioned horizontally with the magnetic force to maintain a stable state, thereby vibrating the motor 122. Even when the plurality of magnets 133 are lowered to a certain height and approached in a state of movement by the rotation in the state of FIG. 5 than the MLCC 10 shown in FIG. 4, it is not easy to change the direction. Here, the falling heights all represent the same height, and in the MLCC 10, the main material of the external electrodes 12 formed at the ends of both sides is copper (Cu), so the effect on the magnetic force of the magnet 133 is smaller than that of the internal electrode layer 13. receive

In order to rotate the MLCC 10 shown in FIG. 4 or 5 to the state shown in FIG. 6 using the above-described operation, the height of the lifting and lowering of the plurality of magnets 133 is such that the MLCC 10 shown in FIG. 6 is horizontal with the line of magnetic force. It is set to be able to change the direction of the MLCC 10 shown in FIGS. 4 and 5 while maintaining it, and these settings are calculated and set through repeated experiments.

For example, the plurality of MLCCs 10 are aligned at one end 123a of the transport path 123 and transported along the transport path 123 by the multiple magnetic flux generating head 130 shown in FIG. 3 or 4. After the shown MLCC 10 is converted to a position where the magnetic resistance is reduced as shown in FIG. 5 and maintained in the most stable state with respect to the line of magnetic force as shown in FIG. 6, the end of one side of the conveying path 123 ( In 123a), they are sorted and transported. In the multi-magnetic flux generating head 130, a plurality of magnets 133 are arranged in a multi-holder 132 with the N poles of each N (N) pole and S (S) pole facing downward and spaced apart from each other at regular intervals, L × K It is arranged in, and is repeatedly raised and lowered to a certain height by the cylinder transfer mechanism 134. That is, the plurality of magnets 133 are arranged in L×K, and the plurality of MLCCs 10 are placed in contact with the inner lower surface of the ball feeder 121 or other MLCCs are moved up and down by the cylinder transfer mechanism 134. Even when located on the top of (10), the magnetic force of each of the plurality of magnets 133 is transmitted, and each MLCC 10 is rotated as shown in FIG. 5 in the state of FIG. 4 in a direction in which the magnetic resistance is reduced, The direction is changed to the state and aligned at the end 123a on one side of the conveying path 123.

That is, the bowl feeder 121 is loaded with a plurality of MLCCs 10 to be packed on a reel (not shown) inside, and the MLCCs 10 are vibrated and rotated by the electric motor 122. Ball feeder 121 As shown in FIG. 2 by vibration, bounce, or rotation, it may be positioned in a state of being seated on the bottom surface of the ball feeder 121 or positioned on the upper surface of another MLCC 10, and also, the MLCC 10 As shown in FIG. 2, the MLCC 10 may gather and wait to enter the end 123a of one side of the conveyance path 123 in a state inclined between the MLCC 10 and the MLCC 10.

In the multi-magnetic flux generating head 130, a plurality of magnets 133 arranged in a multi-holder 132 are repeatedly raised and lowered at a constant height by a cylinder transfer mechanism 134 to the inside of the ball feeder 121. The plurality of magnets 133 are repeatedly raised and lowered in a vertical direction toward the plurality of MLCCs 10 waiting to enter the end 123a on one side of the conveyance path 123 at a constant height. As shown in FIG. 2 by repetitive lifting and lowering of the plurality of magnets 133, the plurality of MLCCs 10 located inside the ball feeder 121 at various heights and postures are converted to a direction in which magnetic resistance is reduced, and the MLCC ( 10) before entering the end 123a on one side of the transport path 123, the internal electrode layer 13 is allowed to enter in a state where the direction is changed to be perpendicular to the bottom surface of the transport path 123. That is, the direction of the plurality of MLCCs 10 is changed by the plurality of magnets 133 before entering the end 123a on one side of the transport path 123 so that the direction can be easily changed without interfering with each other. do.

The change of direction of the plurality of MLCCs 10 aligned at one end 123a of the conveying path 123 causes the MLCC 10 shown in FIG. 3 or 4 to have magnetic resistance by the multiple magnetic flux generating head 130. After being converted as shown in FIG. 5 in the decreasing direction, it is conveyed in an aligned state at the end 123a on one side of the conveying path 123 as shown in FIG. 6 . In the multi-magnetic flux generating head 130, a plurality of magnets 133 are arranged in a multi-holder 132 with the N poles of each N (N) pole and S (S) pole facing downward and spaced apart from each other at regular intervals, L × K It is arranged in, and is repeatedly raised and lowered to a certain height by the cylinder transfer mechanism 134.

The MLCC 10 is aligned as shown in FIG. 6 at one end 123a of the conveyance path 123, that is, the inner electrode layer 13 of the MLCC 10 is vertically aligned with the bottom surface of the conveyance path 123. It is continuously conveyed along the conveying path 123 while maintaining the same state, and is conveyed to the other end 123b of the conveying path 123. The MLCC 10 is conveyed along the linear conveyance path 141 of the linear feeder 140 in a state conveyed to the other end 123b of the conveyance path 123. After the MLCC 10 is transported along the linear transport path 141 of the linear feeder 140, the internal electrode layers 13 are packaged on a reel (not shown) so that the inner electrode layers 13 are horizontal to each other. Here, the plurality of MLCCs 10 are conveyed along the linear transfer path 141 of the linear feeder 140 in the state shown in FIG. 6, and when conveyed in the state shown in FIG. 4, the MLCCs 10 are rotated to The internal electrode layers 130 included in each of the MLCCs 10 are transported so that they are horizontal to each other. That is, in the plurality of MLCCs 10, each inner electrode layer 130 is rotated to be horizontal with the bottom surface of the conveying path 123 and then conveyed along the linear conveying path 141 of the linear feeder 140 to reel (shown) not shown), when the MLCC 10 is mounted on a printed circuit board (not shown) using a reel, the internal electrode layer 13 included in the MLCC 10 is level with the surface of the printed circuit board, so that the MLCC 10 It allows mounting without additional direction change.

As described above, the MLCC aligning device of the present invention uses the large surface area of the plurality of magnets 133 before the MLCC 10 enters or enters the conveying path 123 of the part feeder 120, so that the MLCC has a magnetic resistance. The MLCCs 10 that are continuously transported along the conveying path 123 are converted to the decreasing direction and entered into the conveying path 123, and the MLCCs 10 adjacent to each other are aligned in the direction of decreasing magnetic resistance. It is possible to prevent the direction of increased magnetic resistance from being disturbed, and thus the MLCC 10 can be stably aligned and transported in a state where the direction of magnetic resistance is reduced.

The MLCC alignment device of the present invention is applied to the multilayer element component manufacturing industry.

10: MLCC 11: ceramic fired body
12: external electrode 13: internal electrode
110: fixed block 120: parts feeder
121: bowl feeder 122: electric motor
123: return path 130: multiple magnetic flux generating head
131: fixing bracket 132: multi-holder
131: magnet 134: cylinder transfer mechanism
140: linear feeder 141: linear transfer path

Claims (5)

A parts feeder disposed above the fixed block to transport a multi-layer ceramic capacitor (MLCC) along a transport path;
It includes a multi-magnetic flux generating head disposed on the fixed block spaced apart from the part feeder and aligning the MLCC located inside the part feeder by converting it in a direction in which magnetic resistance is reduced,
The multiple magnetic flux generating head includes a fixing bracket disposed above the fixing block and spaced apart from the part feeder, a multiple holder disposed below the fixing bracket and positioned inside the part feeder, and each of the multiple holders A plurality of magnets arranged at regular intervals with the N pole of the N (N) pole and the S (S) pole facing downward and converting a plurality of MLCCs located inside the part feeder in a direction in which the magnetic resistance is reduced; A cylinder transport mechanism disposed between the fixing bracket and the multiple holders to raise and lower the multiple holders in a vertical direction at a constant height,
The multi-holder has a cylinder transfer mechanism connected to the upper part, raised and lowered in a vertical direction at a constant height by the cylinder transfer mechanism, and a plurality of insertion grooves into which magnets are inserted at the bottom are spaced apart at regular intervals and arranged in L × K. The L and the K are each natural numbers greater than 1,
The plurality of magnets are inserted into the insertion groove formed in the multi-holder, respectively, and the MLCC, where the lower part of the N pole is located inside the part feeder by the cylinder transfer mechanism, is switched to the direction in which the magnetic resistance is reduced, and the part feeder is aligned. An MLCC aligning device in which the MLCC located on the upper side of the MLCC located inside is switched to a direction in which the magnetoresistance is reduced and moved up and down to a height at which it is aligned. According to claim 1,
The part feeder includes a bowl feeder having a conveyance path formed at an inner edge,
An electric motor disposed on the upper side of the fixing block to be located on the lower side of the ball feeder and vibrating and rotating the ball feeder so that the MLCC located inside the ball feeder is transported along the conveying path,
The transfer path is formed in a spiral shape on the inside of the ball feeder, and one end of the transfer path is arranged so that the center of the lower surface of the multiple holders of the multiple magnetic flux generating head is aligned with the N of the plurality of magnets disposed in the multiple holders. The pole causes the MLCC located at one end of the transfer path to be converted in the direction in which the magnetic resistance is decelerated, and the other end is the linear feeder's linear feeder so that the MLCC transferred along the transfer path is transferred to the linear feeder's linear feeder. MLCC alignment device connected to one end of the furnace. According to claim 1,
The fixing bracket includes a vertical member disposed above the fixing block to be spaced apart from the part feeder, and a horizontal member connected to the upper part of the vertical member and to which a cylinder transfer mechanism is connected to one side,
The multi-holder has a cylinder transfer mechanism connected to the upper part, raised and lowered in a vertical direction at a constant height by the cylinder transfer mechanism, and a plurality of insertion grooves into which magnets are inserted at the bottom are spaced apart at regular intervals and arranged in L × K. The L and the K are each natural numbers greater than 1,
The cylinder transfer mechanism is an MLCC alignment device in which a pneumatic cylinder is used. delete According to claim 1,
The part feeder is disposed on one side, and a linear feeder is disposed in which a linear conveyance path is formed to guide the MLCC to be conveyed and discharged along the conveyance path in a straight line.

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