JPH04255479A - Reciprocator - Google Patents

Abstract

PURPOSE:To reciprocate a reciprocating member in noncontact condition by making use of magnetism. CONSTITUTION:An induction coil 9 is attached to a reciprocating member 6, which is provided reciprocatably and recoverably to the origin by the energizing force of an energizing member, and also a cylindrical magnet group 1, where bar magnets 2 in pairs are provided at specified intervals in circumferential direction, is provided opposite to this induction coil 9. The line of magnetic force lines 3 crosses the induction coil 9 by the rotation of the magnetic group 1, and an induced current is generated in the induction coil 9, and repulsion occurs between the induction coil 9 and the magnet group 1, and the reciprocating member 6 moves in the direction that it goes away from the magnet group 1. When the induced current is reduced, the reciprocating member 6 moves in the direction of the magnet group 1 by the biasing force of the biasing member 12.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a reciprocating device, and more particularly to a reciprocating device that utilizes magnetism.

0002

[Prior art and its problems] Conventionally, reciprocating devices used in places that require reciprocating motion include those that utilize the forward and backward movement of a cylinder, etc., and those that utilize the driving force of a motor, etc. is generally known.

However, since the reciprocating device configured as described above uses a cylinder, motor, etc. as a driving source, it is not possible to obtain reciprocating motion in a non-contact state. It cannot be used in a sealed vacuum container.

As shown in FIG. 3, a reciprocating device that eliminates the above-mentioned drawbacks is a reciprocating device that is supported by a bearing 21 so as to be able to reciprocate, and is returned to its origin by the urging force of urging members 22. A reciprocating member 1 that can be provided
A bar magnet 15 is attached to the tip of the reciprocating member 16, and a bar magnet 20 is provided so as to be movable forward and backward in the direction of the reciprocating member 16, facing the bar magnet 15 of the reciprocating member 16. There is also a structure in which the reciprocating member 16 is configured to be able to reciprocate in a non-contact state by the cooperation of the repulsive force of 20 and the urging force of the urging members 22, 22.

In this case, if the repulsive force between the bar magnets 15 and 20 of the reciprocating member 16 is f1, the strengths of both magnetic poles are m1 and m2, and the distance is r, then the repulsive force f1 is as follows.
The relationship is f1∝(m1・m2)/r・r, and the bar magnet 2
The movement of the reciprocating member 16 is not proportional to the movement of zero. Therefore, it is difficult to set the repulsive force, ie, the reciprocating stroke of the reciprocating member 16, to a desired value.

The present invention solves the problems of the conventional devices as described above, and is capable of obtaining reciprocating motion even in a completely sealed vacuum container, and also reduces the reciprocating stroke of the reciprocating member. The object of the present invention is to provide a reciprocating device that can adjust the value to a desired value.

[0007]

[Means for Solving the Problems] In order to solve the above problems, the present invention provides an induction coil in a reciprocating member that is provided to be able to reciprocate and return to its origin by the urging force of an urging member. At the same time, a group of cylindrical magnets is rotated, in which a pair of bar magnets, with their axial directions in the same direction and opposite poles facing each other, are placed at predetermined intervals in the circumferential direction, facing this induction coil. When the magnet group rotates, the lines of magnetic force of the pair of bar magnets in the magnet group cross within the induction coil, generating an induced current in the induction coil, which causes repulsion between the magnet group and the induction coil. A force is generated,
The reciprocating member moves in a direction away from the magnet group, while
When the magnetic lines of force of the pair of bar magnets in the magnet group separate from the induction coil due to the rotation of the magnet group, the induced current in the induction coil disappears, and thereby the reciprocating member is urged by the urging member and the reciprocating member is urged by the urging member. A means for moving in a direction approaching a group of magnets is adopted, and a moving distance of the reciprocating member changes in proportion to the number of rotations of the group of magnets, and the reciprocating member is located within a vacuum container. It may be a means.

[0008]

[Operation] By adopting the above-mentioned means, this invention
When the magnet group rotates, the lines of magnetic force of the pair of bar magnets in the magnet group cross the induction coil of the reciprocating member, an induced current is generated in the induction coil, and a repulsive force is generated between the magnet group and the induction coil. Due to the repulsive force, the reciprocating member moves in a direction away from the magnet group against the biasing force of the biasing member. When the magnet group rotates further and the magnetic field lines of the bar magnet separate from the induction coil, the induced current in the induction coil disappears, and the reciprocating member is moved toward the origin, that is, in the direction toward the magnet group, by the biasing force of the biasing member. Moving. By repeating such movements, the reciprocating member reciprocates.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention shown in the drawings will be described below. FIG. 1 shows a first embodiment of a reciprocating device according to the present invention, and this reciprocating device includes a magnet group 1 attached to a rotating shaft of a drive source such as a motor, It is provided with a reciprocating member 6 that can reciprocate, and an induction coil 9 attached to the reciprocating member 6.

The magnet group 1 has a plurality of pairs of bar magnets 2 with their axes in the same direction and opposite polarities arranged at predetermined intervals in the circumferential direction, so that the whole has a cylindrical shape. The bar magnet 2 of the magnet group 1 is attached to the rotating shaft 5 of a drive source 4 such as a motor so that the axis of each bar magnet 2 is in the same direction as the axis of the rotating shaft 5.

The reciprocating member 6 includes a rod-shaped main body 7 through which a bearing 11 provided on the mounting member 10 passes, and a rod-shaped main body 7 which is integrally provided with the main body 7 and has a diameter larger than that of the main body 7. The induction coil 9 is attached to one end of the main body part 7 so as to face the magnet group 1, and there is a disc-shaped protrusion 8 between the protrusion 8 and the mounting member 10. is provided with biasing members 12, 12 that hold the reciprocating member 6 at the origin in a normal state and bias it toward the origin during reciprocation.

Next, the effects of the above will be explained. First, the drive source 4 such as a motor is operated to rotate the rotating shaft 5.
When rotated, as the rotating shaft 5 rotates, the magnet group 1 integrally attached to the rotating shaft 5 rotates, and the lines of magnetic force 3 of the most advanced bar magnet 2 in the rotational direction of the magnet group 1 reciprocate. An induced current is generated across the induction coil 9 of the member 6 and within the induction coil 9. This induced current generates a repulsive force between the magnet group 1 and the induction coil 9, and the reciprocating member 6 moves in a direction away from the magnet group 1 against the urging force of the urging members 12, 12.

Next, as the magnet group 1 rotates, the lines of magnetic force 3 of the most advanced bar magnet 2 in the rotation direction separate from the induction coil 9, the induced current disappears from within the induction coil 9, and the reciprocating member 6 is attached. It moves in the direction of the origin, that is, in the direction of the magnet group 1, by the biasing force of the biasing members 12, 12.

Next, due to the rotation of the magnet group 1, the lines of magnetic force 3 of the bar magnet 2, which is the second from the tip in the direction of rotation, are directed to the induction coil 9.
, an induced current is generated in the induction coil 9 as described above, and this induced current generates a repulsive force between the magnet group 1 and the induction coil 9, causing the reciprocating member 6 to push the biasing member 1
It moves in a direction away from the magnet group 1 against the urging forces of magnets 2 and 12.

When the magnetic line of force 3 of the second bar magnet 2 from the leading end in the rotational direction moves away from the induction coil 9 due to the rotation of the magnet group 1, the induced current in the induction coil 9 disappears, and the reciprocating member 6 It moves in the direction of the origin, that is, in the direction of the magnet group 1, by the biasing force of the biasing members 12, 12.

As described above, the induction current is repeatedly generated and extinguished in the induction coil 9 of the reciprocating member 6 due to the rotation of the magnet group 1, and the biasing member 12
, 12 causes the reciprocating member 6 to reciprocate.

In the above case, the repulsive force f2 between the magnet group 1 and the induction coil 9 is proportional to the temporal change in the magnetic field line φ of the magnet group 1, and if the number of turns of the induction coil 9 is N, then f2∝N・d
Since it becomes φ/dt, the repulsive force, that is, the moving distance of the reciprocating member 6 can be changed in proportion to the rotation speed of the drive source 4 such as a motor.

Therefore, the reciprocating member 6 is moved in a non-contact state.
By adjusting the rotation speed 4 of the drive source, the reciprocating stroke of the reciprocating member 6 can be set to a desired value.

Further, contrary to the above, it is also possible to set the moving distance of the reciprocating member 6 and control the rotation speed of the drive source 4 in accordance with the moving distance.

FIG. 2 shows a second reciprocating device according to the present invention.
The reciprocating device shown in this embodiment is one in which the reciprocating member 6 is provided in a completely sealed vacuum container 13 made of a non-magnetic material. Since the structure is the same as that shown in the first embodiment, the same parts as shown in the first embodiment are given the same numbers and a detailed explanation of the structure will be given. shall be omitted.

Also in this embodiment, the magnet group 1
is rotated together with the rotating shaft to generate or eliminate an induced current in the induction coil 9 of the reciprocating member 6, and by the urging force of the urging members 12, 12, the inside of the vacuum vessel 13 is This means that the reciprocating member 6 can be reciprocated without contact.

[0022] Therefore, since the inside of the vacuum container 13 can be completely sealed, there is no fear of dust or the like getting into the container 13, and reciprocating motion can always be achieved in a clean state. Become.

Also in this embodiment, the moving distance of the reciprocating member 6, that is, the reciprocating stroke, can be adjusted to a desired value by adjusting the rotation speed of the rotary shaft 5. In each of the above embodiments, a repulsive force is generated between the magnet group and the induction coil, but an attractive force may be generated by adjusting the magnetic lines of force of the magnet group.

[0024]

Effects of the Invention According to the present invention, with the above structure, the reciprocating member can be reciprocated in a non-contact state. This means that the reciprocating motion can be achieved in a clean state without the presence of dust or the like. In addition, since the repulsive force between the magnet group and the induction coil can be changed in proportion to the rotation speed of the magnet group, by adjusting the rotation speed of the magnet group, the moving distance of the reciprocating member, that is, the reciprocating This has excellent effects such as being able to set the stroke to a desired value.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a first embodiment of a reciprocating device according to the present invention.

FIG. 2 is a diagram showing a second embodiment of the reciprocating device according to the invention.

FIG. 3 is a diagram showing an example of a conventional reciprocating device.

[Explanation of symbols] 1...Magnet group 2, 15, 20... Bar magnet 3... Lines of magnetic force 4... Drive source 5...Rotation axis 6, 16...Reciprocating member 7... Main body 8...Protruding part 9...Induction coil 10...Mounting member 11, 21...Bearing 12, 22... biasing member 13...Vacuum container

Claims (3)

[Claims] 1. An induction coil is attached to a reciprocating member which is provided to be able to reciprocate and return to its origin by the urging force of an urging member, and the induction coil is opposed to the induction coil so that the axial directions thereof are in the same direction, A pair of bar magnets with different polarities facing each other is rotatably provided in a cylindrical magnet group at predetermined intervals in the circumferential direction, and when the magnet group rotates, the pair of bar magnets in the magnet group are rotated. The magnetic field lines of the magnet cross the induction coil, generating an induced current in the induction coil, which generates a repulsive force between the magnet group and the induction coil, causing the reciprocating member to move away from the magnet group. On the other hand, when the magnetic lines of force of the pair of bar magnets in the magnet group separate from the induction coil due to the rotation of the magnet group, the induced current in the induction coil disappears, thereby causing the reciprocating member to urge the urging member. A reciprocating device characterized in that the reciprocating device moves in a direction approaching the magnet group. 2. The reciprocating device according to claim 1, wherein the moving distance of the reciprocating member changes in proportion to the number of rotations of the magnet group. 3. The reciprocating device according to claim 1, wherein the reciprocating member is located within a vacuum vessel.