JPH0794321A - Magnetic chuck - Google Patents

Abstract

PURPOSE:To make it possible to operate the magnetic chuck by outside input power by a method wherein magnetic attraction force on the outer surface of a yoke is adjusted by the relative movement of a rod-like permanent magnet, on which a plurality of magnetic poles having different magnetization direction are formed axial in direction at a constant pitch, and non-magnetic yoke which is magnetically shut off and divided in axial direction at a fixed interval by non-magnetic material. CONSTITUTION:The magnetic chuck is composed of the rod-like permanent magnet 2, on which a plurality of magnetic poles, having different magnetizing directions, are formed in axial direction at a constant pitch, and a soft magnetic yoke 4, which is magnetically interrupted and divided by non-magnetic material at a fixed interval in axial direction, where the rod-like permanent magnet 2 is inserted, and a chuck main body having a through hole 10 surrounding the rod-like permanent magnet 2. The intensity of magnetic field of the closed loop of a magnetic circuit, to be formed passing through the adjacent soft magnetic yokes 4 which are divided by the relative movement in axial direction between the rod-like permanent magnet 2 and the chuck main body, can be adjusted in this magnet chuck. As a result, there is no limit on the number of attraction surfaces, and the magnetic chuck which is operated by the external input power and freely detachable, can be obtained in a simple manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnet chuck for fixing a soft magnetic material by using a magnetic attraction force.

[0002]

2. Description of the Related Art FIGS. 11 and 12 are schematic end views of a conventional rotary operation type magnet chuck. FIG. 11 shows an attracted state and FIG. 12 shows a non-attracted state. Reference numeral 1 denotes an attracted material of a soft magnetic material, and a through hole is formed at the center of a pair of soft magnetic material yokes 4 and 4 which face each other with a non-magnetic material 3 having a magnetic insulating ability interposed therebetween.
The permanent magnet 2 is rotatably inserted and can be closely attached to the attraction surfaces 40 and 41 of the magnet chuck M. FIG. 11 shows the attracted state, in which the magnetic flux from the N pole flows into the soft magnetic material 4, the attracted surface 40, the attracted material 1, the attracted surface 41, the soft magnetic material 4, and the S pole to form a closed magnetic path. Therefore, the adsorption surfaces 40 and 41 and the adsorbed material 1 are adsorbed. FIG. 12 shows a non-adsorbed state, in which the magnet 2 is rotated 90 ° with respect to FIG. 11. The magnetic flux emitted from the N pole flows with the soft magnetic material 4 and the S pole. Therefore, the magnetic flux does not substantially flow to the adsorption surfaces 40 and 41, and the adsorption action does not occur. In FIG. 11, the other surfaces 42 and 43 of the soft magnetic material 4 form a closed magnetic path as described above when the adsorbed material 1 is brought into close contact therewith, and similarly exhibit an adsorbing action. By the way, the other surfaces 44 and 45 of the soft magnetic material cannot form a closed magnetic path and have no substantial adsorptivity.

[0003]

However, in such a magnet rotating type structure, only two surfaces can be used as the attracting surfaces. Therefore, it is difficult to perform the work in the case of a machine tool that requires a large number of suction surfaces such as four surfaces and six surfaces. In addition, the attachment / detachment operation requires a magnet rotation operation, which complicates the operation mechanism when it is incorporated into automation of machinery. Therefore, it is an object of the present invention to provide a magnet chuck that can be attracted on multiple surfaces and has a simple operation mechanism.

[0004]

In order to achieve this object, according to the present invention, a rod-shaped permanent magnet formed by forming a plurality of magnetic poles having different magnetization directions at a constant pitch in the axial direction and a soft magnetic material yoke are not provided. A magnetic body is magnetically shielded and divided at regular intervals in the axial direction. A rod-shaped permanent magnet is inserted, and a chuck body having a through hole surrounding and surrounding the rod-shaped permanent magnet is formed. A magnetic chuck is characterized in that the magnetic field strength of a closed loop of a magnetic circuit formed across adjacent divided soft magnetic material yokes by axial relative movement with a main body is adjustable.

[0005]

With the above construction, a rod-shaped permanent magnet formed by forming a plurality of magnetic poles having different magnetization directions at a constant pitch in the axial direction and a non-magnetic material are magnetically cut off and divided at regular intervals in the axial direction. When the magnetic flux flowing from the N pole of the rod-shaped permanent magnet to the adjacent S pole flows from the opposing soft magnetic material yoke to the adjacent soft magnetic material yoke to reach the adjacent S pole due to the relative position to the adjacent soft magnetic material yoke. While the magnetic attraction force acts on the attracted material located on the outer surface of the yoke, when the magnetic flux from the N pole flows to the adjacent S pole through the same soft magnetic material yoke, the magnetic attraction force is not exerted on the outer surface of the yoke. It will be. Therefore,
The magnetic attraction force on the outer surface of the yoke can be adjusted by the relative movement of the rod-shaped permanent magnet and the soft magnetic material yoke. Further, since the soft magnetic material yoke surrounds the rod-shaped permanent magnet, it is possible to form all the attracting surfaces in the axial direction on the outer circumference of the yoke body, and the number of attracting surfaces is not limited. Furthermore, since the operation of attaching and detaching the attracted material by magnetic attraction is also a relative movement in the axial direction,
It can be operated by a simple external input, such as an air cylinder or electric input, and can be easily incorporated into automatic machinery.

Further, when the division pitch of the soft magnetic material yoke divided in the axial direction by the non-magnetic material corresponds or substantially corresponds to the magnetic pole pitch of the rod-shaped permanent magnet, the axial direction of the rod-shaped permanent magnet and the chuck body is made. By relative movement, different magnetic poles can be distributed and positioned in the adjacent soft magnetic material yoke areas, and as a result, the magnetic flux flowing from the N pole to the adjacent S pole can effectively flow to the adjacent yoke, and the yoke outer surface On the other hand, when different magnetic poles are located in the same soft magnetic material yoke area, a closed loop of a magnetic circuit is formed in the soft magnetic material yoke, and a strong magnetic attraction force can be generated in the yoke outer surface. The magnetic attraction force can be made substantially zero (see FIG. 4).

According to the magnet chuck of the present invention, the magnetic attraction force can be generated on the entire surface, but the magnetic attraction force on each surface can be controlled independently. That is, the chuck body is formed into a polygonal columnar body or a columnar body, for example, a quadrangular prism, and magnetically cut and divided by a plane including a diagonal line thereof, and a through hole formed in each columnar body in a longitudinal direction thereof is formed. It is preferable to integrate a plurality of magnet chucks by inserting a bar-shaped permanent magnet having a plurality of magnetic poles having different magnetization directions at a constant pitch in each of the above-mentioned axial directions.
0 (a)). When two or more rod-shaped permanent magnets are inserted into each divided pillar to increase the magnetic flux density on the outer surface of the yoke, for example, as shown in FIG. It is necessary to consider the insertion position of each bar-shaped magnet so that the magnetic flux density inside the yoke can be made uniform so as to facilitate the flow. In addition, FIG.
When the chuck body is an octagonal prism as shown in Fig. 10 and when it is a cylinder as shown in Fig. 10 (d), it is divided into 8 or 4 in the longitudinal direction at the surface 33 toward the center, and 4, the rod-shaped permanent magnet 2 is inserted through the through hole 10. Here, a mounting hole 11 is formed in the center of the chuck body, and the chuck body is mounted at a predetermined position via a rotation shaft (not shown) made of a non-magnetic material. Further, a through-hole extending in the axial direction is formed at the center of the outer polygonal column, and the rod-shaped permanent magnet is inserted therein. By arranging a plurality of parts and dividing them, a magnetic attraction force corresponding to the division angle can be generated and erased on each divided chuck body surface (see FIG. 9).

On the other hand, according to the present invention, a rod-shaped permanent magnet formed by forming a plurality of magnetic poles with different magnetization directions at a constant pitch in the axial direction, and a soft magnetic material yoke surrounding and surrounding the rod-shaped permanent magnet. It is possible to form a large magnetic attraction surface by connecting in parallel a magnet chuck made up of a chuck body that is magnetically shielded and divided by a non-magnetic material at regular intervals in the axial direction (see FIG. 5). It is also possible to form the composite chuck body having a wide magnetic attraction surface by arranging the composite chuck bodies connected in parallel so as to form each side surface of a quadrangular prism as shown in FIG. In one of these composite chuck bodies, if one of the movable magnets is fixed, the strength of magnetic attraction can be increased by strengthening and canceling the superposition of the magnetic flux of the fixed rod magnet and the movable rod magnet (see FIG. 6). That is, an even number of rod-shaped permanent magnets formed by forming a plurality of magnetic poles having different magnetization directions at a constant pitch in the magnetic flux canceling axial direction are inserted, and the rod-shaped permanent magnets are inserted and extend in the axial direction surrounding the rod-shaped permanent magnets. A plurality of soft magnetic material yokes, which are magnetically separated by a non-magnetic material in the axial direction at regular intervals, and half of which are opposed to the soft magnetic material yokes through the through holes. It is fixed to the integrated structure and the other half is slidably inserted as movable magnets, and the movable magnets are moved in the axial magnetic pole pitch to connect the same poles of each rod-shaped permanent magnet with a soft magnetic material yoke to generate an attractive force. Also, the movable magnet may be configured to move the magnetic pole pitch in a direction opposite to the movable direction to form a closed loop of the magnetic circuit via the soft magnetic material yoke so that the attraction force becomes substantially zero.

The relative movement of the rod-shaped magnet can be controlled by an air cylinder or an electric input, but an electromagnetic plunger having at least a part of the rod-shaped magnet as a mover of the electromagnetic plunger is combined with the magnet chuck to be integrated. With the structure, the rod-shaped permanent magnet can be moved in the axial direction by an electric operation input (see FIG. 7). At that time, if a stopper is provided on at least one end of the magnet chuck and the stopper is made of a soft magnetic material or a permanent magnet (see FIG. 8), the operation state can be stored, so that it can be easily incorporated into an automatic machine / equipment. Becomes

[0010]

FIG. 1 shows a partial cut view of the present invention. Reference numeral 2 is a rod-shaped permanent magnet provided with a plurality of magnetic poles in the axial direction, and 7 is a rod for operating the magnet 2, which is integrated with the magnet. Reference numeral 4 is a square soft magnetic yoke provided at a magnetic pole pitch interval, and 3 is a non-magnetic material provided between the soft magnetic yokes 4, and the soft magnetic yoke 4 and the non-magnetic material 3 have an integral structure and have a magnet 2 A hole (a through hole) 10 for receiving is provided. Further, stoppers 5 and 6 that determine the movable range of the magnet 2 are provided at both ends of the integrated structure.

FIG. 2 shows a rod-shaped permanent magnet 2, which contains Mn-Al-C as a main component.
Since the axis of easy magnetization is aligned in the direction of extrusion, the rod-shaped permanent magnet can be formed by integrally forming a plurality of magnetic poles having different magnetization directions at a constant pitch in the axial direction. The characteristic in the axial direction is the residual magnetic flux density 0.55T (55
00 Gauss), coercive force of 200 KA / m (2500 Oersted), and radial characteristic of residual magnetic flux density of 0.27T
(2700 gauss), coercive force 144 KA / m (1800
(Oersted). An ordinary ferrite magnet may be joined together to form a rod-shaped permanent magnet. At that time, it is necessary to interpose a non-magnetic material or a soft magnetic material at the joint between the magnets so that the magnetic flux in the axial direction flows out to the outer peripheral surface.

FIG. 2A shows a change state of the surface magnetic flux density when the rod-shaped magnet 2 is a cylinder and the magnetic poles are magnetized in a ring shape, and FIG. 2B shows the inside and outside of the magnet 2 at that time. Shows the state of the magnetic flux flowing through. Here, the interval at which the maximum fluctuation of the surface magnetic flux density occurs is called the magnetic pole pitch. Like this, rod-shaped M
In order to complete the magnetized state of FIG. 2 using the n-Al-C material, as shown in FIG. 2 (c), the rod-shaped magnet material 2 is inserted into the outer cylinder 51 at a constant axial position on the outer circumference thereof. Magnetizer 5 including coils 52 and 52 wound with a magnetic pole pitch
Magnetize at 0. In this magnetizer 50, the direction of the magnetizing current is set so that the magnetizing direction is reversed at the magnetic pole pitch interval, so that the magnetic force lines flow from the inside of the magnet to the outer peripheral surface of the magnet as shown by the magnetic force lines 53, 53 in the figure. Therefore, the axial and radial characteristics of the magnet material can be fully utilized and the magnetic flux can be converged on the outer peripheral surface.

Now, FIG. 3, which is a cut cross section of FIG.
The structure and operation of the magnet chuck will be described in detail with reference to FIG. FIG. 3 shows the attracted state, and the attracted material 1 is in close contact with the outer surface of the magnet chuck. The magnetic flux generated from the N pole flows from the soft magnetic material yoke 4 closely adjacent to the adsorbed material 1 closely adhering to the outside, and then from the adjacent soft magnetic yoke 4 closely adjacent to the S pole and opposed to the S magnetic pole to the closed magnetic path. create. Therefore, the attracted material 1 is attracted to the soft magnetic material yoke 4. 9 is a magnetic pole pitch (see FIG. 2 (a)), and 8 is a gap, which is half the magnetic pitch. Further, in this state, the magnet 2 is in contact with one stopper 6. FIG. 4 shows a non-adsorbed state, in which the magnet 2 is in contact with one stopper 5 and is movable by half the magnetic pole pitch. The magnetic flux emitted from the N pole flows from the same soft magnetic material yoke 4 to the S pole. Therefore, the attractive force is substantially zero on the outer surface of the soft magnetic material yoke 4. Although four suction surfaces are used in the embodiment, the outer surface may be a polyhedron or a column.

FIG. 5 shows an embodiment in which two rod-shaped permanent magnets are provided. Although not shown, two rod-shaped permanent magnets 2 provided with the operating rod 7 are provided, and the soft magnetic material yoke 4 magnetically serves. By being combined, the magnetic flux to the outer surface increases and the attractive force also increases. It is also possible to provide a plurality of holes and a plurality of rod-shaped permanent magnets 2.

FIG. 6 shows an embodiment in which two rod-shaped permanent magnets are provided and the attachment / detachment operation is performed by one rod-shaped magnet. The rod-shaped permanent magnet 2a is fixed to stoppers 5 and 6. An operating rod 7 is attached to one of the rod-shaped permanent magnets 2b. Figure 6
In this state, the attracted material 1 is not shown, but the same poles of the two rod-shaped magnets 2a and 2b are magnetically connected by the soft magnetic yoke 4. There is a gap 9 between the end of the magnet 2b and the stopper 5, which is the same as the magnetic pole pitch. Although the non-adsorbed state is not shown, when the air gap 9 is zero, that is, when the magnets 2b are in contact with the stopper 5, the magnets 2a and 2b form a closed magnetic path via the soft magnetic material yoke 4 and are substantially outside. The suction force on the side surface becomes zero. A plurality of magnets 2a and 2b may be provided in pairs.

FIG. 7 shows an embodiment in which an external operation is performed by electric input. Further, as the structure shows, a closed structure is possible. An electromagnetic plunger 20 is integrated with the non-magnetic material 3. Reference numeral 21 is a drive coil, and 22 is an electric input lead wire. Reference numeral 23, which is integrated with the stopper 5, is made of a soft magnetic material or a permanent magnet and has a function of storing the state.

FIG. 8 is a diagram for explaining the operation of the electromagnetic plunger. FIG. 8A shows the attracting state of the electromagnetic plunger, and the respective poles of the electromagnetic plunger 20 and the magnet 2 are in the attracting state. In this state, even if the excitation input is zero, the magnet 2 is attracted to the iron core of the electromagnetic plunger 20 and holds the state.
(B) The figure shows the repulsive state of the electromagnetic plunger.
Electromagnetic plunger 20 and each pole of magnet 2 repel each other,
Will come into contact with 23. In this state, even if the excitation input is set to zero, the magnet 2 and the stopper 23 are attracted to each other and the state is maintained.

FIG. 9 is a sectional view of the front surface of the soft magnetic material yoke for adjusting the suction force on the outer surface thereof.
The soft magnetic material yoke 4 is divided by the non-magnetic material 33 and has an integral structure. The magnetic flux from the rod-shaped permanent magnet 2 is supplied to the outer surface of each soft magnetic material yoke at the angle shown, and the attraction force is adjusted independently for each surface according to the amount thereof. In addition,
Adjustment by division other than implementation is also possible.

FIG. 10 is a front sectional view showing an embodiment in which the outer surface of the soft magnetic material yoke 4 is detached and attached independently. The outer surface 33 and the soft magnetic material yoke 4 are magnetically divided and have an integral structure. Therefore, the rod-shaped permanent magnets 2a, 2b, 2c, and 2d are not magnetically coupled, and independent attachment / detachment operations of the respective attracting surfaces are possible.

As described above, according to the present invention, a plurality of magnetic poles N and S having different magnetization directions are provided alternately in the axial direction,
Preferably, all or most of the constituent magnetic poles have a bar-shaped permanent magnet having the same magnetic pole pitch, and a plurality of soft magnetic material yokes having a structure which is close to and surrounds the permanent magnet and is slightly shorter than the magnetic pole pitch in the axial direction at magnetic pole pitch intervals. A non-magnetic material is provided between the soft magnetic material yokes to form an integrated structure, and the permanent magnet is moved in the axial direction by a half pitch of the magnetic pole pitch with respect to the chuck body so that the magnetic pole and the soft magnetic material yoke face each other. An attractive force is generated on the surface of the magnetic material yoke that does not face the permanent magnet, and the magnetic pole is magnetically short-circuited by the soft magnetic material yoke by moving the magnetic pole half pitch in the direction opposite to the moving direction. , Because the adsorption force is set to substantially zero,
The outer circumference of the magnet chuck can be the entire suction surface, and the number of suction surfaces is not limited. Further, the attachment / detachment operation is also movable in the axial direction, and it can be operated by a simple external input, for example, an air cylinder or an electric input, and can be easily incorporated into an automatic machine / equipment.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional perspective view of a magnet chuck according to an embodiment of the present invention,

2 is a graph (a) and a schematic view (b) showing a magnetized state of the rod-shaped permanent magnet shown in FIG. 1, a cross-sectional view showing a magnetizing step, FIG.

FIG. 3 is an operation explanatory view of the magnet chuck shown in FIG. 1, showing an attracted state.

FIG. 4 is an operation explanatory diagram similar to FIG. 3, showing a non-suction state.

FIG. 5 is a perspective view of a composite magnet chuck according to another embodiment of the present invention,

FIG. 6 is a sectional view of another embodiment of the composite magnet chuck of the present invention,

FIG. 7 is a partial cross-sectional perspective view of another embodiment for explaining the driving operation of the magnet chuck of the present invention,

FIG. 8 is a sectional view for explaining the operation of the magnet chuck of FIG.

FIG. 9 is an end view of a magnet chuck capable of performing surface attraction force control according to the present invention,

FIG. 10 is an end view of another composite magnet chuck according to the present invention capable of independently controlling the attraction force on each side surface,
(A) is a case where the chuck body is a quadrangular prism, (b) is a case where the chuck body is a quadrangular column and a plurality of rod-shaped permanent magnets are inserted into each divided column, and (c) is a case where the chuck body is an octagonal column. , (D), if the chuck body is a cylinder, (e)
Shows the case where each surface of the chuck body is formed of a composite.

FIG. 11 is an end view for explaining the operation of the conventional rotary operation type magnet chuck, showing an attracted state.

FIG. 12 is an end view for explaining the operation of the same magnet chuck as in FIG. 11, showing a non-adsorbed state.

[Explanation of symbols]

 1 Adsorbed Material 2 Permanent Magnet 3 Non-Magnetic Material 4 Soft Magnetic Yoke 5, 6 Stopper 7 Operation Rod 10 Through Hole 20 Electromagnetic Plunger

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[Procedure amendment]

[Submission date] August 25, 1994

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a partial cross-sectional perspective view of a magnet chuck according to an embodiment of the present invention,

FIG. 2 is a graph (a) and a schematic diagram (b) showing a magnetized state of the rod-shaped permanent magnet shown in FIG. 1, a cross-sectional view showing a magnetizing step,

FIG. 3 is an operation explanatory view of the magnet chuck shown in FIG. 1, showing an attracted state.

FIG. 4 is an operation explanatory diagram similar to FIG. 3, showing a non-suction state.

FIG. 5 is a perspective view of a composite magnet chuck according to another embodiment of the present invention,

FIG. 6 is a sectional view of another embodiment of the composite magnet chuck of the present invention,

FIG. 7 is a partial cross-sectional perspective view of another embodiment for explaining the driving operation of the magnet chuck of the present invention,

FIG. 8 is a sectional view for explaining the operation of the magnet chuck of FIG.

FIG. 9 is an end view of a magnet chuck capable of performing surface attraction force control according to the present invention,

FIG. 10: Independent control of suction force on each side according to the present invention
The end view of another compound magnet chuck that can
The case where the main body of the rack is a square prism is shown.

FIG. 11: Independent suction force control of each side according to the present invention
The end view of another compound magnet chuck that can
The main body of the rack is a square pole, and multiple rod-shaped permanent magnets are inserted into each divided pole.
The case where it is entered is shown.

FIG. 12: Independent control of suction force on each side according to the present invention
The end view of another compound magnet chuck that can
The case where the main body of the hook is an octagonal prism is shown.

FIG. 13: Independent control of suction force on each side according to the present invention
The end view of another compound magnet chuck that can
The case where the main body of the hook is a cylinder is shown.

FIG. 14: Independent control of suction force on each side according to the present invention
The end view of another compound magnet chuck that can
The case where each surface of the main body is formed of a composite is shown.

FIG. 15 is an end view for explaining the operation of the conventional rotary operation type magnet chuck, showing an attracted state.

FIG. 16 is an end view for explaining the operation of the same magnet chuck as FIG . 15 , showing a non-adsorbed state.

[Explanation of symbols] 1 Adsorbed material 2 Permanent magnet 3 Non-magnetic material 4 Soft magnetic yoke 5, 6 Stopper 7 Operating rod 10 Through hole 20 Electromagnetic plunger

[Procedure 3]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

FIG. 15

[Figure 6]

[Figure 7]

[Figure 8]

[Figure 9]

[Figure 10]

FIG. 11

[Fig. 13]

FIG. 16

[Fig. 12]

FIG. 14

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukio Nakanishi 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. Sanyo Special Steel Co., Ltd.

Claims (8)

[Claims] 1. A rod-shaped permanent magnet formed by forming a plurality of magnetic poles having different magnetization directions at a constant pitch in the axial direction, and a soft magnetic material yoke are magnetically isolated by a nonmagnetic material at constant intervals in the axial direction. And a chuck main body having a through hole that surrounds and surrounds the rod-shaped permanent magnet and is surrounded by the rod-shaped permanent magnet. A magnetic chuck characterized in that the magnetic field strength of a closed loop of a magnetic circuit formed across magnetic material yokes is adjustable. 2. The soft magnetic material yoke divided in the axial direction by the non-magnetic material corresponds to or substantially corresponds to the magnetic pole pitch of the rod-shaped permanent magnet, and the rod-shaped permanent magnet and the chuck body are axially opposed to each other. The different magnetic poles are distributed and positioned in the adjacent soft magnetic material yoke areas by the movement to form a magnetic circuit closed loop across the adjacent yokes to generate a strong magnetic attraction force on the outer surface of the yoke, while the different magnetic poles are made the same soft magnetic material. 2. The magnet chuck according to claim 1, wherein the magnet chuck is located in the yoke area and forms a closed loop of a magnetic circuit in the soft magnetic material yoke so that the magnetic attraction force on the outer surface of the yoke is substantially zero. 3. The through hole formed in the longitudinal direction of each columnar body formed by magnetically blocking and dividing the chuck body in the form of an outer polygonal columnar body or a columnar body, and the surface facing the center thereof. One or more rod-shaped permanent magnets are inserted through each to integrate a plurality of magnet chucks, and each rod-shaped permanent magnet is slid to independently generate magnetic attraction force on each divided outer surface of the chuck body. The composite magnet chuck according to claim 1, wherein the composite magnet chuck is configured to. 4. The chuck body is a polygonal columnar body or a columnar body, and the rod-shaped permanent magnet is inserted into the center of the chuck body. The chuck body has a through hole that is adjacent to and surrounds the axially extending magnetism and extends from the through hole. A plurality of magnetic shield plates extending in the axial direction reaching the outer circumference of the chuck body are arranged around the through hole at a predetermined angle, and a magnetic attraction force corresponding to the dividing angle is slid to separate the chuck body from the chuck body. The composite magnet chuck according to claim 1 or 2, wherein the generation and erasure control is performed on the surface. 5. A rod-shaped permanent magnet formed by forming a plurality of magnetic poles having different magnetization directions at a constant pitch in the axial direction, and a soft magnetic material yoke surrounding and surrounding the rod-shaped permanent magnet with a non-magnetic material. The composite magnet chuck according to claim 1 or 2, wherein a magnet chuck composed of a chuck body magnetically shielded and divided at regular intervals in the axial direction is connected in parallel to form a wide magnetic attraction surface. 6. An even number of rod-shaped permanent magnets formed by forming a plurality of magnetic poles having different magnetization directions at a constant pitch in the axial direction,
The rod-shaped permanent magnet is inserted and has a plurality of through holes extending in the axial direction that surround the rod-shaped permanent magnet, and the soft magnetic material yoke is magnetically cut and divided at a constant interval in the axial direction by a non-magnetic material. Half of the chuck body is fixed to the integral structure by facing the soft magnetic material yoke through the through hole, and the other half is slidably inserted as a movable magnet. The same poles of the rod-shaped permanent magnets are connected by a soft magnetic material yoke to generate an attractive force, and the movable magnet is moved by a magnetic pole pitch in a direction opposite to the above moving direction to form a closed loop of a magnetic circuit via the soft magnetic material yoke. A magnet chuck that is constructed so that its attractive force is substantially zero. 7. An electromagnetic plunger comprising at least a part of a rod-shaped magnet as a mover of the electromagnetic plunger,
The magnet chuck according to any one of claims 1 to 6, wherein the magnet chuck is combined with the magnet chuck to form an integral structure, and the rod-shaped permanent magnet can be moved in the axial direction by an electric operation input. 8. The magnet chuck according to claim 1, wherein at least one end of the magnet chuck is provided with a soft magnetic material or a permanent magnet to serve as a stopper so that the operation state can be stored.