JPH045769Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a reciprocating drive device equipped with a bed and a table that are coupled so as to be able to reciprocate through rolling elements, and is used for assembling various precision instruments. It can be used as a positioning device necessary for the process.

(Prior art) As shown in Japanese Unexamined Patent Publication No. 47-20537, the repulsive force and attractive force of two fixed electromagnets and a permanent magnet placed between them with springs on both sides are used at the same time. Magnetic engines that perform reciprocating motion are known.

(Problem that the invention aims to solve) However, the above conventional technology is aimed at continuous reciprocating motion, and the shock when the magnet and electromagnet collide with each other is reduced by the spring, and at the same time, the polarity is automatically changed by the polarity converter. It is designed so that the two stop positions are opposite to each other, and it is not designed to selectively stop at two stop positions on the left and right.

(Means for Solving the Problems) The present invention is a reciprocating drive device that includes a bed and a table that are coupled through rolling elements so as to be able to reciprocate, in which a magnetic pole is disposed on the lower surface of the center of the table, and a magnetic pole is provided at both ends of the bed. An electromagnetic coil is provided at the end of the reciprocating motion, and stoppers are disposed at two stop positions at the ends of the reciprocating motion, and at the stop position where the table is blocked by the stoppers, the axis of the magnet of the table is located inside the axis of the electromagnetic coil. The electromagnetic coil is shifted as shown in FIG.

(Effect) The electromagnetic force generated between the magnet and the electromagnetic coil is
A component force is generated to move the table in a straight line, and the table is moved and held at two stop positions regulated by a stopper. When the direction of the electromagnetic force is reversed by switching the energization to the electromagnetic coil, the table moves back and is held at the opposite stop position.

(Embodiment) FIGS. 5 and 6 show a reciprocating drive device which is the premise of the present invention, and is itself well known. The bed 1 is placed inside a table 2 having a U-shaped cross section, and is attached to a fixing member 5. The table 2 is attached to a member 6 for linear movement. A large number of balls 3 are interposed between both sides of the bed 1 and the inner surface of the table 2. Each ball 3 is rotatably connected to each other by a retainer 4. Round rod-shaped ways 7 are arranged on both sides of the bed 1 and on the inner surface of the table 2, respectively.
Each ball 3 touches them at 4 points. A preload plate 9 is provided along one inner surface of the table 2 and presses the two ways 7a toward the ball 3.

By adjusting the amount of tightening of the preload bolts 9, the preload plate 8 adjusts the contact pressure between each ball 3 and the eight ways 7, and eliminates play between them. Gate-shaped stop plates 10 are fixed to both end faces of the table 2 to prevent the retainer 4 from being pulled out.

FIGS. 1 and 2 show an example in which the present invention is implemented in the above-mentioned reciprocating drive device. A permanent magnet 18 is placed on the lower center surface of the table 2 with its north pole facing downward. 16 and 17 are electromagnets arranged at both ends of the bed 1, and the coil 16
a, 17a, and is buried in the bed 1, with its pole facing upward.

When the electromagnets 16 and 17 are energized in the illustrated state, and the upper pole of the electromagnet 16 becomes the north pole and the upper pole of the electromagnet 17 becomes the south pole, an attractive force acts between the permanent magnet 18 and the electromagnet 17, Since a repulsive force acts between the table 2 and the electromagnet 16, the table 2 moves to the left as shown in FIG. This exercise is stopper 14
It is stopped at that position. At this stop position, the axis a of the permanent magnet 18 is located in front (on the right side) of the axis b of the electromagnet 17, so the electromagnet 1
If the energization of the table 7 continues, the resulting electromagnetic force component will continue to press the table 2 against the stopper, acting to maintain the stopped state.

When the direction of current to the coils 16a and 17a is reversed and the electromagnet 16 is set to the south pole and the electromagnet 17 is set to the north pole, an attractive force is created between the permanent magnet 18 and the electromagnet 16.
A repulsive force is generated between the permanent magnet 18 and the electromagnet 17. . Since the axis a of the permanent magnet 18 is shifted toward the front side (to the right) than the axis b of the electromagnet 17, the repulsive force generates a component force that drives the table 2 rightward. As a result, table 2 moves to the right and the fourth
As shown in the figure, it comes into contact with a stopper 15 and stops. In this state, the axis a of the permanent magnet 18 is on the front side (left side) of the axis c of the electromagnet 16, so it generates a component force to maintain the stop as described above, and a component force to start the reverse rotation. can occur.

Note that since the bed 1 and table 2 are usually made of aluminum, no magnetic short circuit occurs.

Although not shown in the drawings, it is also possible to use a bearing in which the rolling elements are rollers, or a bearing in which the rolling elements circulate endlessly within the table. The same method can be applied even when the length of the bed and the table are not equal (for example, the length of the bed is longer).

(Effects) According to the present invention, in a reciprocating drive device that includes a bed and a table that are coupled through rolling elements so as to be able to reciprocate, a magnetic pole is provided on the lower center surface of the table, and electromagnetic coils are provided at both ends of the bed to reciprocate. A stopper is disposed at two stop positions at the end of the movement, and at the stop position where the table is stopped by the stopper, the axis of the magnet of the table is shifted to be located inside the axis of the electromagnetic coil. The generated electromagnetic force includes a component force in the direction of the linear motion, and a means for reversing the energizing current of the electromagnetic coil is provided, so that the electromagnetic coil moves in the reverse direction at two stop positions at the ends of the reciprocating motion. This has the effect that reciprocating motion can be performed with a smaller electromagnetic force than in conventional devices.

[Brief explanation of drawings]

1 to 4 show an embodiment of the present invention,
Figure 1 is a side view, Figure 2 is a front view, Figures 3 and 4.
The figures are front views at different operating positions, and Figure 5 is a side view showing the reciprocating drive device that is the premise of the present invention.
FIG. 6 is a front view of the same. 1...Bed, 2...Table, 3...Ball, 14,15...Stopper, 16,17...
Electromagnet, 16a, 17a... Coil, 18... Permanent magnet.

Claims (1)

[Scope of utility model registration request] In a reciprocating drive device that includes a bed and a table that are coupled to each other for reciprocating motion via rolling elements, a magnetic pole is provided at the bottom center of the table, and electromagnetic coils are provided at both ends of the bed to allow two stops at the ends of the reciprocating motion. A stopper is disposed at the stop position, and when the table is stopped by the stopper, the axis of the magnet of the table is shifted to be located inside the axis of the electromagnetic coil, and the electromagnetic force generated by the table is shifted to the linear movement. A reciprocating drive device, characterized in that the reciprocating drive device includes means for reversing the energizing current of the electromagnetic coil.