JPH0329079Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a permanent magnetic chuck with a thin structure.

[Problems to be solved by conventional techniques and ideas]

In recent years, with advances in material technology, various devices have become smaller and lighter, and thinner magnetic chucks, particularly permanent magnet chucks, have also appeared.

Here, conventional permanent magnet chucks are turned on and off by mechanically operating the magnetic element, and the permanent magnets that make up the magnetic element have the same pitch as the magnetic pole pitch of the attracting face plate. Arranged. In addition, rare earth magnets are used as permanent magnets to meet the demand for strong attraction.
Since many disc-shaped products are manufactured and easily available, disc-shaped products of various diameters are generally incorporated into chucks.

As described above, the conventional device has a structure in which the magnetic element is a structure in which a large number of small disk-shaped rare earth magnets are embedded in the frame and mechanically slid, and therefore the structure is complicated. That is, in order to assemble a disk-shaped permanent magnet onto a sliding member, it is extremely complicated because it is necessary, for example, to form a hole that matches the disk magnet, insert the magnet into the hole, and bond the magnet.
Another drawback is that the entire device is expensive because it uses expensive rare earth magnets.

Ferrite magnets are cheaper magnetic materials than rare earth magnets.

However, it is not widely used in conventional thin permanent magnet chucks. This is because its magnetic properties, such as coercive force and magnetic permeability, are insufficient, and a strong attractive force cannot be obtained with a magnetic element that is simply an array of thin ferrite magnets.

This invention was made in consideration of the above points,
To provide a thin permanent magnet type chuck with simple structure and low cost.

[Means to solve the problem]

In order to achieve the above object, the present invention includes an attraction face plate having magnetic poles arranged at a predetermined pitch, and a magnet element disposed below the attraction face plate and having a plurality of magnets arranged alternately at the predetermined pitch.
In a permanent magnetic chuck that attracts and releases a workpiece on the attraction face plate by sliding the magnet element along the magnetic pole arrangement direction at the predetermined pitch, the magnet element is made of a single sheet of plate-shaped magnetic material. A permanent magnet characterized in that the plate-shaped magnetic body is segmented and magnetized so that different poles appear alternately and without gaps at the predetermined pitches, and the magnetized areas resulting from this magnetization constitute each of the magnets. It provides a formula check.

[Effect]

The magnet element of the present invention is made of a plate-shaped magnetic material, and this plate-shaped magnetic material is segmented and magnetized so that different poles appear alternately and without gaps at a predetermined pitch, and the magnetized areas resulting from this magnetization constitute each of the magnets. are doing. Therefore, magnetic poles appear alternately and continuously on the surface of the plate-shaped magnetic body, and lines of magnetic force are generated from the entire surface of the plate-shaped magnetic body. The suction action is performed by the entire surface of the chuck's suction face plate.

[Effect of idea]

As described above, the present invention is a magnet element made of a plate-shaped magnetic material that is segmented and magnetized so that different poles appear alternately and without gaps at a predetermined pitch, and the magnetized areas due to this magnetization constitute each of the magnets. Since the attraction face plate is constructed using magnets, it is possible to construct a permanent magnet type chuck that is thin yet capable of strong attraction, and even if a ferrite magnet is used, a small and strong chuck can be provided. Moreover, since the plate-shaped magnetic body is composed of a single sheet, the mechanism for holding the magnet element is simplified, and the assembly process can be reduced. As a result of using a magnet element made of a plate-shaped magnetic material in place of the conventional multiple magnets, it is no longer necessary to attach each magnet one by one when using multiple magnets, and the manufacturing process is greatly simplified in this respect as well. can be converted into

〔Example〕

FIG. 1 is a partial vertical sectional view of an embodiment of the present invention. The attraction face plate 1 is formed by alternately stacking magnetic poles 2a and polarization plates 3, and arranging end magnetic poles 2b at both ends. A bottom plate 5 is provided below the attraction face plate 1 via a main body frame 4 made of a non-magnetic material, and a magnet element 6 made of a plate-shaped ferrite magnet is provided between the attraction face plate 1 and the bottom plate 5. , 7b, the magnetic pole 2a can be slid in the stacking direction (longitudinal direction of the chuck).

In this way, the suction face plate 1, the main body frame 4, and the bottom plate 5 are
Since the magnet element 6 is disposed in the gap formed by the magnet element 6, the magnetic circuit on the attraction face plate can be switched by sliding the magnet element 6.

FIG. 2 is a plan view showing the embodiment shown in FIG. 1 with the suction face plate 1 removed. FIG. 2a shows the on state, and FIG. 2 b shows the off state.

The plate-shaped ferrite magnet forming the magnet element 6 is magnetized so that different poles appear alternately on the surface at the same pitch as the stacking pitch of the attraction face plate 1. This kind of magnetization has been easily realized due to recent advances in magnetic materials and advances in the magnetization method conventionally used to magnetize rubber belts, and it is possible to form a sharp magnetic pole pattern on the surface of a plate-shaped magnetic material. are being considered.

This chuck can be switched between the on state and the off state by moving the driven knobs 7a and 7b in the directions of arrows 8a and 8b. This is done by sliding the magnetic element half a pitch in the longitudinal direction of the magnet.

3A and 3B are partially enlarged views of the cross-sectional view shown in FIG. 1, with FIG. 3A showing the on state and FIG. 3B showing the off state. The magnet element 6 is a plate-shaped ferrite magnet, and is magnetized in sections so that N and S poles appear alternately at predetermined pitches (stacked pitches of the magnetic poles 2a) on the surface in contact with the attraction face plate 1.

As shown in FIG. 3a, N is attached to the bottom surface of the magnetic pole 2a.
When the centers of the poles and the S poles touch, a magnetic circuit (lines of magnetic force 9) appears on the pole face plate 1 via the magnetic pole 2a. Therefore, the permanent magnet chuck is turned on and attracts the workpiece (magnetic material).

As shown in Figure 3b, there is an N pole and an S pole on the bottom surface of the polarization plate 3.
If the centers of the poles touch, the magnetic circuit (magnetic lines of force 9) will be short-circuited at the magnetic pole 2a and will not appear on the magnetic pole face plate 1. Therefore, the permanent magnet chuck is turned off and releases the workpiece (magnetic material).

FIG. 4 is a cross-sectional view of a plate-shaped ferrite magnet magnetized so that different poles appear alternately on both the front and back surfaces. In this case, the bottom plate 5 in contact with the lower surface
Although it is necessary to use a magnetic material (such as iron), strong adsorption force can be obtained.

Note that various mechanisms such as a cam type mechanism can be adopted as the mechanism for sliding the magnetic element.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of one embodiment of the present invention, Fig. 2 is a plan view of the embodiment of Fig. 1 with the suction face plate removed, and Fig. 3 is a partially enlarged sectional view of Fig. 1; 4
The figure is a sectional view of a magnet element according to another embodiment of the present invention. 1...Adsorption face plate, 2a, 2b...Magnetic pole, 3...
Polarization plate, 4... Body frame, 5... Bottom plate, 6... Magnetic element, 7a, 7b... Followed knob.

Claims (1)

[Claims for Utility Model Registration] An attraction face plate in which magnetic poles are arranged at a predetermined pitch with a polarization plate in between, and a magnet element disposed below the attraction face plate and in which a plurality of magnets are arranged alternately at the predetermined pitches. In the permanent magnet chuck, which attracts and releases a workpiece on the attraction face plate by sliding the magnet element along the magnet arrangement direction at the predetermined pitch, the magnet element is a single ferrite plate. This plate-like magnetic material is segmented and magnetized so that different poles appear alternately and without gaps at the predetermined pitches, and the magnetized areas resulting from this magnetization constitute each of the magnets. Features a permanent magnet chuck.