Polishing apparatus

Abstract

To provide a polishing device which has a simple configuration and can be manufactured at a low cost while easily switching on / off of fixing of a workpiece by a magnet.SOLUTION: A belt conveyor mechanism 1 and a polishing mechanism 2 are provided, the belt conveyor mechanism 1 is provided with a work positioning mechanism 5 for fixing a work W on a conveyor belt 3, and the work positioning mechanism 5 is provided with a magnet part 6 and a magnet part moving mechanism 7 for switching and moving the magnet part 6 between an attraction position and a non-attraction position. The magnet part 6 is composed of a permanent magnetic 6a, and the magnet part moving mechanism 7 is provided with a turning link part 8 and a magnet arranging part 9, and is constituted so as to arrange the magnet part 6 in an attracting position by moving in the carrying direction of the work W while raising the magnet arranging part 9 by turning of the turning link part 8.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a polishing device that polishes and deburrs a workpiece while transporting the workpiece on a belt conveyor. [Background technology]

[0002] In this type of polishing device, a large polishing force acts on the workpiece, so a conveyor belt with a strong grip is used to prevent the workpiece from moving due to this polishing force. However, for small or long workpieces that have a small contact area with the conveyor belt, the grip force (friction force) is weak, so the workpiece is not held in place tightly enough and moves during processing, which can result in improper processing.

[0003] In order to solve the above problem, a device has been proposed in the past, as shown in Patent Document 1, which uses a magnet to improve the fixing force on the workpiece by the attraction action of the magnet. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 6-17857 Summary of the Invention [Problem to be solved by the invention]

[0005] When the workpiece is fixed with this magnet, the fixing force is much stronger than when there is no magnet, and even small or long workpieces can be polished properly without moving during the polishing process. However, when polishing large workpieces with a large contact area with the conveyor belt, the fixing force can become too large (strong), causing an overload on the motor that drives the conveyor belt or causing the conveyor belt to meander.

[0006] Furthermore, when fixing with a magnet, the workpiece is magnetized to some extent, but there are some workpieces that should not be magnetized due to the subsequent processing.

[0007] Therefore, fixing with magnets is not suitable for large workpieces or workpieces that you do not want to magnetize, so it is necessary to turn the magnetic fixing on and off. However, if an electromagnet, which allows you to easily switch the magnetic force on and off, is used, electrical control is required, making the device configuration complex. In addition, to obtain a large adhesive force over a wide area that covers the polishing range via a non-magnetic conveyor belt, a high-performance electromagnet must be used, which creates the problem of high manufacturing costs.

[0008] The present invention has been made in consideration of the current situation, and aims to provide a polishing device that can easily switch on and off the fixation of the workpiece using a magnet, has a simple configuration, and can be manufactured at low cost. [Means for solving the problem]

[0009] The gist of the present invention will be explained with reference to the accompanying drawings.

[0010] A polishing device includes a belt conveyor mechanism 1 for transporting magnetic workpieces W, and a polishing mechanism 2 for polishing the workpieces W transported by the belt conveyor mechanism 1. The belt conveyor mechanism 1 is composed of a conveyor belt 3 and a drive mechanism 4 for driving the conveyor belt 3. The drive mechanism 4 is provided with a workpiece positioning mechanism 5 for positioning the workpiece W placed on the conveyor belt 3. The workpiece positioning mechanism 5 has a magnet portion 6 for attracting the workpiece W on the conveyor belt 3, and a magnet portion 6 for attracting the workpiece W to an attraction position where the magnet portion 6 exerts an attraction effect and a polishing mechanism 2 for polishing the workpiece W transported by the belt conveyor mechanism 1. and a magnet part moving mechanism 7 for switching between a non-adsorption position in which the workpiece W is not attracted and a non-adsorption position in which the workpiece W is not attracted, the magnet part 6 being composed of a permanent magnet 6a, and the magnet part moving mechanism 7 having rotating link parts 8 arranged parallel to each other at an interval in the conveying direction of the workpiece W, and magnet arrangement parts 9 arranged between the rotating link parts 8 and in which the magnet part 6 is arranged, the rotation of the rotating link parts 8 causes the magnet arrangement parts 9 to move upward in the conveying direction of the workpiece W, and the magnet part 6 is switched from the non-adsorption position to the adsorption position.

[0011] The polishing apparatus according to claim 1 is characterized in that it is provided with a switching operation unit 10 that operates the magnet unit moving mechanism 7, and this switching operation unit 10 is configured to be manually operable.

[0012] Furthermore, in the polishing apparatus described in claim 1, the work positioning mechanism 5 is provided with a biasing member 11 that applies a biasing force to the magnet part moving mechanism 7, and this biasing member 11 is configured to bias the magnet arrangement part 9 in the movement direction when the magnet part 6 is positioned at the adsorption position.

[0013] Furthermore, in the polishing apparatus described in claim 2, the work positioning mechanism 5 is provided with a biasing member 11 that applies a biasing force to the magnet part moving mechanism 7, and this biasing member 11 is configured to bias the magnet arrangement part 9 in the movement direction when the magnet part 6 is positioned at the adsorption position.

[0014] Furthermore, in the polishing apparatus described in any one of claims 1 to 4, the work positioning mechanism 5 has an upward movement regulating means 12 that regulates the movement of the magnet arrangement portion 9, and this upward movement regulating means 12 is configured to regulate the movement of the magnet arrangement portion 9 and stop the magnet arrangement portion 9 when the magnet portion 6 reaches the absorbing position when switching and moving the magnet portion 6 from the non-absorbing position to the absorbing position.

[0015] Furthermore, in the polishing apparatus described in any one of claims 1 to 4, the magnet portion 6 is provided with a predetermined length in the transport direction of the workpiece W, and further, is configured so that both ends in the transport direction have a smaller adhesive force than other portions.

[0016] Furthermore, in the polishing apparatus described in claim 5, the magnet portion 6 is provided with a predetermined length in the transport direction of the workpiece W, and further, is configured so that the adhesive force at both ends in the transport direction is smaller than that of other portions. [Effects of the Invention]

[0017] Since the present invention is configured as described above, it is possible to easily switch on and off the fixation of the workpiece by the magnet, and it is possible to provide a polishing device that has a simple configuration and can be manufactured at low cost. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 2 is an explanatory diagram showing a belt conveyor mechanism and a polishing mechanism according to the present embodiment. [Figure 2]FIG. 2 is a perspective view showing the belt conveyor mechanism of the present embodiment. [Figure 3] FIG. 2 is an exploded perspective view showing the belt conveyor mechanism of the present embodiment. [Figure 4] FIG. 2 is a plan view showing the magnet portion of the present embodiment. [Figure 5] FIG. 2 is a perspective view showing a magnet portion position switching mechanism of the present embodiment. [Figure 6] 3A and 3B are explanatory diagrams showing an attractive position and a non-attractive position of the magnet part in this embodiment. [Figure 7] 5A to 5C are explanatory diagrams showing the operation of the workpiece positioning mechanism of the present embodiment. [Figure 8] 1A is an explanatory diagram showing a state of the biasing member when the magnet portion is in the attracting position, and FIG. 1B is an explanatory diagram showing a state of the biasing member when the magnet portion is in the non-attracting position in this embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0019] A preferred embodiment of the present invention will be briefly described below, illustrating the operation of the present invention with reference to the drawings.

[0020] In the present invention, the magnet part moving mechanism 7 can switch and move the magnet part 6 that attracts the workpiece W on the conveyor belt 3 between an attracting position where it exerts an attracting effect on the workpiece W and a non-attracting position where it does not exert an attracting effect on the workpiece W.

[0021] Therefore, when polishing a large workpiece W for which the adhesive force becomes too great, by not allowing the magnet section 6 to exert its adhesive effect, it is possible to prevent overloading of the drive motor 15 that drives the conveyor belt 3 and meandering of the conveyor belt 3.Furthermore, when polishing a workpiece W that should not be magnetized, it is possible to prevent the workpiece W from becoming magnetized.

[0022] Furthermore, in the present invention, the magnet section 6 is composed of a permanent magnet 6a, and the magnet section moving mechanism 7 is a link mechanism that includes rotating link sections 8 that are arranged parallel to each other and spaced apart in the conveying direction of the workpiece W, and magnet arrangement sections 9 that are arranged between these rotating link sections 8, so that the structure is simple and can be manufactured inexpensively.

[0023] Furthermore, because the magnet section 6 attracts the workpiece W, a force acts on the magnet section 6 to move in the movement direction (transport direction) of the workpiece W as the workpiece W moves, but in the present invention, when the magnet section 6 is switched and moved from the non-attraction position to the attraction position, the magnet arrangement section 9 on which the magnet section 6 is provided moves upward in the transport direction of the workpiece W, and the magnet section 6 is positioned at the attraction position, so there is no risk of the fixing force of the magnet section 6 on the workpiece W being reduced, and a stable fixing force can be exerted on the workpiece W. If the magnet arrangement section 9 on which the magnet section 6 is provided were configured to move upward in the opposite direction to the transport direction of the workpiece W, and the magnet section 6 were positioned at the attraction position, the attraction effect of the magnet section 6 on the workpiece W would be reduced. [Example]

[0024] Specific embodiments of the present invention will be described with reference to the drawings.

[0025] As shown in FIG. 1, this embodiment is a polishing apparatus including a belt conveyor mechanism 1 for transporting a magnetic workpiece W, and a polishing mechanism 2 for polishing the workpiece W transported by this belt conveyor mechanism 1.

[0026] This embodiment also has a housing (not shown), in which the belt conveyor mechanism 1 and the polishing mechanism 2 are housed.

[0027] Although this embodiment shows a case where the polishing apparatus of the present invention is applied to a deburring apparatus, the present invention is not limited to application to a deburring apparatus.

[0028] Each component of this embodiment will be described in detail below.

[0029] First, the polishing mechanism 2 will be described.

[0030] As shown in FIG. 1, the polishing mechanism 2 of this embodiment has two polishing processing sections. The polishing processing section 2a on the entrance side of the conveying direction is equipped with a polishing brush for rough grinding, and the polishing processing section 2b on the exit side of the conveying direction is equipped with a polishing brush for finishing.

[0031] The number of polishing units and the type of polishing brushes can be changed as appropriate.

[0032] Next, the belt conveyor mechanism 1 will be described.

[0033] FIG. 2 shows the belt conveyor mechanism 1 in this embodiment, and FIG. 3 is an exploded perspective view thereof.

[0034] As shown in FIG. 3, the belt conveyor mechanism 1 includes a conveyor belt 3 and a drive mechanism 4 that drives the conveyor belt 3.

[0035] The drive mechanism 4 is composed of a U-shaped frame member 13 that extends in the left-right direction (the direction in which the work W is transported) and opens downward, a pair of rotating rollers 14 provided at both longitudinal ends of this frame member 13, and a drive motor 15 that drives one of the rotating rollers 14.

[0036] As shown in Figure 3, the frame member 13 has an opening 13b formed on the upper surface 13a that is large enough to expose the magnet portion 6, and two plate-shaped members shown in Figure 3 (hereinafter, the lower plate-shaped member will be referred to as the "lower plate-shaped member 16" and the upper plate-shaped member will be referred to as the "upper plate-shaped member 17") are stacked on this upper surface 13a.

[0037] The lower plate-shaped member 16 is formed in the same shape and size as the upper surface 13a of the frame member 13, and is formed in the center in the same shape as the planar external shape of the magnet portion 6, with a fitting opening portion 16a into which the magnet portion 6 can be fitted.

[0038] The upper plate-like member 17 is made of a non-magnetic material (stainless steel in this embodiment), is formed to have the same shape and size as the lower plate-like member 16, and has a flat upper surface that comes into contact with the conveyor belt 3. The upper plate-like member 17 is provided on the lower plate-like member 16 so as to close the fitting opening 16a formed in the lower plate-like member 16.

[0039] In other words, when the magnet portion 6 is positioned in the non-adsorption position, the upper plate-shaped member 17 is configured to eliminate the step caused by the fitting opening portion 16a of the lower plate-shaped member 16 and flatten the conveyor surface (work transport surface).Furthermore, if this upper plate-shaped member 17 is made of a magnetic material such as an iron plate, the magnet portion 6 will be strongly adsorbed, making it difficult to operate the switching operation unit 10, so the upper plate-shaped member 17 is made of a non-magnetic material.

[0040] The drive mechanism 4 is also provided with a workpiece positioning mechanism 5 that positions (fixes) the workpiece W placed on the conveyor belt 3.

[0041] This work positioning mechanism 5 is configured to exert an adhesive force (fixing force) on the magnetic workpiece W by the adhesive force of the magnet, and as shown in Figures 4 and 5, it comprises a magnet part 6 and a magnet part moving mechanism 7 that switches and moves this magnet part 6 between an adhesive position where it exerts an adhesive effect on the workpiece W and a non-adhesive position where it does not exert an adhesive effect on the workpiece W, and is provided inside the frame member 13 (below the upper surface 13a of the frame member 13).

[0042] In this embodiment, the attraction position of the magnet part 6 refers to a position where the magnet part 6 fits into the fitting opening 16a of the lower plate-like member 16 provided on the upper surface 13a of the frame member 13, and the upper surface of the magnet part 6 is flush with the upper surface of the lower plate-like member 16. The non-attraction position is not limited to a position where the attraction force (magnetic force) of the magnet part 6 does not act on the workpiece W at all, but also includes a position where some attraction force acts on the workpiece W but does not generate an attraction force that firmly fixes the workpiece W, in other words, a position where a weak attraction force that allows easy movement acts.

[0043] The magnet section 6 is made up of a plurality of permanent magnets 6a (neodymium magnets are used in this embodiment), and is provided in a magnet placement section 9 of the magnet section moving mechanism .

[0044] Specifically, the magnet section 6 is configured such that each permanent magnet 6a extends (vertically) on the magnet arrangement section 9 for a predetermined length in the transport direction of the workpiece W (in this embodiment, the length covers almost the entire longitudinal area of ​​the magnet arrangement section 9), and further, the number of permanent magnets 6a arranged at both ends of the longitudinal direction (transport direction) of the magnet section 6 is smaller than in other parts, so that the adhesive force on the workpiece W is smaller.

[0045] Specifically, as shown in FIG. 4, the magnet section 6 has permanent magnets 6a arranged in a row only at both ends in the longitudinal direction (transport direction), and the permanent magnets 6a are arranged in three rows in the other portions.

[0046] Furthermore, at both ends of the magnet section 6 in the longitudinal direction (transport direction), as shown in Figure 6, permanent magnets (thin plate-shaped permanent magnets 6b) that are thinner than the other permanent magnets 6a are used, and further, a plate-shaped non-magnetic member 6c is stacked on top of this thin plate-shaped permanent magnet 6b so that it has the same thickness (height) as the other permanent magnets 6a, and is configured so that its adhesive force on the workpiece W is smaller (weaker) than that of the other permanent magnets 6a.

[0047] 5 and 6, the magnet unit moving mechanism 7 is configured as a parallel crank mechanism and includes rotating link units 8 arranged parallel to each other at an interval in the conveyance direction of the workpiece W, a magnet arrangement unit 9 pivotally mounted between these rotating link units 8, and a switching operation unit 10, and is configured so that when an operator manually operates the switching operation unit 10, the rotating link units 8 rotate as shown in Fig. 7, and the rotation of this rotating link unit 8 causes the magnet arrangement unit 9 to move upward in the conveyance direction of the workpiece W and place the magnet unit 6 at the adsorption position. Note that hereinafter, in this embodiment, the movement of the magnet arrangement unit 9 upward in the conveyance direction of the workpiece W will be referred to as the upward movement of the magnet arrangement unit 9.

[0048] Specifically, each rotating link section 8 is composed of a pair of link plates 8a arranged opposite each other at a distance in the width direction (short direction) of the frame member 13, a first crankshaft 8b installed between the upper ends of the link plates 8a, and a second crankshaft 8c installed between the lower ends of the link plates 8a, with the first crankshaft 8b pivotally attached to a bearing section 9a provided in the magnet arrangement section 9, and the second crankshaft 8c pivotally attached to a bearing section (not shown) provided in the frame member 13.

[0049] In addition, in this embodiment, in one of the rotating link sections 8, the operating shaft 10a of the switching operation section 10 is configured to be the second crank shaft 8c (the operating shaft 10a of the switching operation section 10 is configured to also serve as the second crank shaft 8c).

[0050] Although the switching operation unit 10 of this embodiment is configured to be manually operable, the switching operation unit 10 may also be configured to be automated using a cylinder device such as an air cylinder.

[0051] The workpiece positioning mechanism 5 also includes an upward movement restricting means 12 that restricts upward movement of the magnet placement section 9, and a biasing member 11 that applies a biasing force to the magnet section moving mechanism .

[0052] The upward movement regulating means 12 is configured to regulate the upward movement of the magnet arrangement section 9 and stop the magnet arrangement section 9 when the magnet section 6 is switched from the non-adsorption position to the adsorption position, and to stop the magnet arrangement section 9 when the magnet section 6 reaches the adsorption position.In this embodiment, the upward movement regulating means 12 is configured as an abutment section (stopper) that the magnet arrangement section 9 abuts against when the magnet section 6 reaches the adsorption position.

[0053] Specifically, in this embodiment, as shown in Figure 7, the opening edge of the opening 13b provided on the upper surface 13a of the frame member 13 is configured to serve as the upward movement restriction means 12, and when the tip of the magnet arrangement portion 9 abuts against this upward movement restriction means 12 (opening edge), the upward movement of the magnet arrangement portion 9 is restricted (the magnet arrangement portion 9 stops), and the magnet portion 6 is held in the adsorption position.

[0054] In addition, when the magnet section 6 is switched from the adsorption position to the non-adsorption position, the downward movement of the magnet arrangement section 9 is restricted by the magnet arrangement section 9 abutting against the second crank shaft 8c of the rotating link section 8, and the position at which the magnet arrangement section 9 abuts against the second crank shaft 8c is a position at which the magnet section 6 provided in the magnet arrangement section 9 exerts almost no adsorption force on the work W on the conveyor belt 3.

[0055] That is, in this embodiment, the second crankshaft 8c of the rotary link portion 8 is configured to also serve as downward movement restricting means for restricting downward movement of the magnet placement portion 9.

[0056] In addition, the biasing member 11 is configured to bias the magnet arrangement portion 9 in an upward movement direction when the magnet portion 6 is positioned in the attraction position, and to bias the magnet arrangement portion 9 in a downward movement direction when the magnet portion 6 is positioned in the non-attraction position.

[0057] Specifically, the biasing member 11 is a spring member (tension spring), and as shown in FIG. 8, is mounted between a biasing member mounting portion 18 provided on the frame member 13 and a biasing member connecting portion 19 provided on the operating shaft 10a of the switching operation unit 10, and is configured so that by pulling this biasing member connecting portion 19, a biasing force also acts on the rotating link portion 8 (link plate 8a provided on the operating shaft 10a), thereby applying an upward movement bias or a downward movement bias to the magnet arrangement portion 9.

[0058] In detail, as shown in Figures 8(a) and (b), in both the state where the magnet portion 6 is in the attraction position and the state where the magnet portion 6 is in the non-attraction position, the biasing member connecting portion 19 is subjected to the pulling action of the biasing member 11 (tension spring) when it is beyond the dead point (dotted line in the figure), and in the attraction position, the biasing member connecting portion 19 is biased in the direction of rotation (clockwise in the figure) when the magnet arrangement portion 9 is moved upward from the non-attraction position to the attraction position, and in the non-attraction position, the biasing member connecting portion 19 is biased in the direction of rotation (counterclockwise in the figure) when the magnet arrangement portion 9 is moved downward from the attraction position to the non-attraction position.In particular, when the magnet portion 6 is in the attraction position, the biasing member connecting portion 19 is configured to be in a position far beyond the dead point so that the magnet portion 6 does not move downward on its own and release the attraction force (fixing force) on the workpiece W being processed.

[0059] In other words, in this embodiment, when the magnet part 6 is positioned in the attraction position, the spring member 11 applies a spring force that tends to move the work W upward in the transport direction, while the upward movement restriction means 12 restricts this movement. As a result, the magnet part 6 is prevented from moving on its own in the direction of the non-attraction position, and the attraction force (fixing force) of the magnet part 6 to the work W acts stably.

[0060] As described above, in this embodiment, the magnet section moving mechanism 7 is composed of a pivoting link section 8 and a magnet arrangement section 9, but the configuration of the magnet section moving mechanism 7 is not limited to this, and it can function appropriately as long as the configuration allows the magnet section 6 to exert an adhesive and non-adhesive effect when the magnet arrangement section 9 moves.

[0061] The effects of the present embodiment configured as above will be described below.

[0062] In this embodiment, the magnet part 6 that attracts the workpiece W on the conveyor belt 3 can be switched and moved between an attraction position where it exerts an attraction effect on the workpiece W and a non-attraction position where it does not exert an attraction effect on the workpiece W simply by the operator manually switching the switching operation unit 10 provided on the magnet part moving mechanism 7.

[0063] Therefore, when polishing a large workpiece W for which the adhesive force becomes too great, the magnet part 6 is placed in the non-adhesive position to prevent the magnet part 6 from exerting its adhesive effect, thereby preventing overload of the drive motor 15 for the conveyor belt 3 and meandering of the conveyor belt 3.Furthermore, when polishing a workpiece W that should not be magnetized, the same operation can be used to prevent the workpiece W from becoming magnetized.

[0064] Moreover, in this embodiment, the permanent magnet 6a is used for the magnet portion 6, and a parallel crank mechanism is adopted as the magnet portion moving mechanism 7, so that the structure is simple and can be manufactured at low cost.

[0065] Furthermore, in this embodiment, when the magnet section 6 is switched from the non-adsorption position to the adsorption position, the magnet arrangement section 9 on which the magnet section 6 is mounted moves upward in the direction of transport of the workpiece W, placing the magnet section 6 at the adsorption position. Therefore, the direction of the force acting on the magnet section 6 is opposite to the direction in which the magnet section 6 is moved to the non-adsorption position, so there is no risk of the magnet section 6 moving toward the non-adsorption position on its own during processing and the fixing force on the workpiece W being weakened. Furthermore, when the magnet section 6 is positioned at the adsorption position, the biasing member 11 applies a biasing force that causes the magnet arrangement section 9 to move upward, so the magnet section 6 is more reliably prevented from moving back, and the adhesive force (fixing force) of the magnet section 6 on the workpiece W acts stably.

[0066] The present invention is not limited to the present embodiment, and the specific configuration of each component can be designed as appropriate. [Explanation of symbols]

[0067] 1 Belt conveyor mechanism 2 Polishing mechanism 3. Conveyor Belt 4 Drive mechanism 5 Work positioning mechanism 6 Magnet section 6a Permanent magnet 7. Magnet moving mechanism 8 Rotating link 9 Magnet placement section 10 Switching operation section 11. Pressurizing member 12. Upward movement control measures double work

Claims

1. a polishing device comprising a belt conveyor mechanism for transporting magnetic workpieces and a polishing mechanism for polishing the workpieces transported by the belt conveyor mechanism, wherein the belt conveyor mechanism is composed of a conveyor belt and a drive mechanism for driving the conveyor belt, and the drive mechanism is provided with a work positioning mechanism for positioning the workpiece placed on the conveyor belt, the work positioning mechanism comprising a magnet portion for attracting the workpiece on the conveyor belt and a magnet portion moving mechanism for switching the magnet portion between an attracting position in which it exerts an attracting effect and a non-attracting position in which it does not exert an attracting effect, the magnet portion being composed of a permanent magnet, and the magnet portion moving mechanism comprising rotating link portions arranged parallel to each other and spaced apart in the transport direction of the workpiece, and magnet arrangement portions arranged between the rotating link portions and in which the magnet portion is disposed, and wherein the magnet arrangement portions are configured to move upward in the transport direction of the workpiece by rotation of the rotating link portions, and the magnet portion is switched and moved from the non-attracting position to the attracting position.

2. 2. The polishing apparatus according to claim 1, further comprising a switching operation unit for operating said magnet unit moving mechanism, said switching operation unit being configured to be manually operable.

3. 2. A polishing apparatus according to claim 1, wherein the workpiece positioning mechanism includes a biasing member that applies a biasing force to the magnet portion moving mechanism, and the biasing member is configured to bias the magnet arrangement portion in the movement direction when the magnet portion is positioned at the attraction position.

4. 3. A polishing apparatus according to claim 2, wherein the workpiece positioning mechanism includes a biasing member that applies a biasing force to the magnet portion moving mechanism, and the biasing member is configured to bias the magnet arrangement portion in the movement direction when the magnet portion is positioned at the attraction position.

5. In the polishing apparatus described in any one of claims 1 to 4, the workpiece positioning mechanism has an upward movement regulating means for regulating the movement of the magnet arrangement portion, and this upward movement regulating means is configured to regulate the movement of the magnet arrangement portion and stop the magnet arrangement portion when the magnet portion reaches the attraction position when switching and moving the magnet portion from the non-attraction position to the attraction position.

6. 5. A polishing apparatus according to claim 1, wherein the magnet portion is provided with a predetermined length in the direction of transport of the workpiece, and further characterized in that the magnet portion is configured so that the adhesive force at both ends in the direction of transport is smaller than that at other portions.

7. 6. A polishing apparatus according to claim 5, wherein the magnet portion is provided with a predetermined length in the direction of transport of the workpiece, and further characterized in that the magnetic force at both ends in the direction of transport is smaller than that at other portions.

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