JPH0324930Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field of the Invention) The present invention relates to a mechanism for converting tensile motion of a wire, rod, etc. into intermittent rotational motion.

(Prior Art) A ratchet mechanism as shown in FIG. 10 is known as a mechanism for periodically rotating a gear or the like in a fixed direction. This ratchet mechanism meshes a drive pawl 101 and a restriction pawl 102 with a gear 100, so that one rotation of the drive pawl 101 causes the gear 100 to rotate one frame, and the restriction pawl 102 prevents the gear 100 from rotating back. The regulating pawl 102 is urged in the direction of the gear 100 by a spring 103.

Furthermore, not only the above-mentioned ratchet mechanism but also generally applied intermittent rotation mechanisms combine gears and pawls.

(Problems with the prior art) Since the conventional intermittent rotation mechanism described above combines gears and pawls, there is a limit to how small the mechanism itself can be made, and furthermore, a return spring must be provided for the pawls, which is extremely difficult to achieve. It is difficult to assemble into a limited space, and the manufacturing of the members that make up the mechanism is also troublesome. Further, the conventional mechanism generates a large amount of operating noise due to the engagement between gears and pawls, and cannot operate at high speed.

(Purpose of the invention) The present invention was created in view of the problems of the conventional methods mentioned above.The purpose of the invention is to be able to be significantly smaller than the conventional ones, to make the component parts easy to manufacture, and to be able to operate at high speed. An object of the present invention is to provide an intermittent rotation mechanism that can reduce operating noise and the like.

(Structure of the invention) In order to achieve the above object, the invention provides an intermediate rotating body in which a magnetic pin is slidably inserted into a case, a tension member and a return spring are attached to the arm of this intermediate rotating body, On the other hand, on one surface of the intermediate rotating body, a fixed body is stacked, in which the part facing the intermediate rotating body is provided with a magnet part whose part is the north pole and a magnet part which is the south pole, spaced apart or adjacent to each other, and on the other surface of the intermediate rotating body The driven rotary body is stacked with a driven rotary body provided with a recess into which the magnet pin is inserted, and the intermediate rotary body is rotated by a predetermined angle by pulling a tension member, and then rotated back by a return spring.During this reciprocating rotation, the intermediate rotary body The magnet pin is attracted and repelled by the magnet part of the fixed body, and this attraction and repulsion
The structure is such that the repulsion causes the magnet pin to engage and disengage from the recessed portion of the driven rotating body, thereby converting it into intermittent rotational motion.

(Example) An example of the present invention will be described below based on the accompanying drawings.

Figure 1 is a longitudinal sectional view of the mechanism according to the present invention, Figure 2 is a plan view of the mechanism, Figure 3 is an exploded perspective view of the main components of the mechanism, and Figure 4 is a perspective view showing the operation of the mechanism. It is a diagram.

In the figure, reference numeral 1 denotes a cylindrical body, and a support plate 3 is fixed to the upper end of this cylindrical body 1 with nuts 2, and a case 5 is attached to this support plate 3 via screws 4. The case 5 consists of a cylindrical case body 5a and a semicircular outer part 5b formed on the outside of the case body 5a.
A driven rotary body 6 is provided, and an intermediate rotary body 7 is rotatably inserted into a rotating shaft 6a of the driven rotary body 6. A part of the intermediate rotating body 7 is integrally provided with an arm part 8 that projects from the case body 5a into the case outer part 5b, and a through hole 9 is bored in the thickness direction in a part of the intermediate rotating body 7. A magnet pin 10 shorter than the length of the through hole 9 is slidably inserted into the through hole 9.

Further, a return spring 11 is stretched between the arm 8 and the inner surface of the case outer part 5b, and one end of a tension member 12 such as a wire or rod is fixed to a part of the arm 8, so that it can be operated externally. This allows the arm 8 to rotate against the return spring 11 to the position shown by the imaginary line in FIG.

Further, the lower end of the rotating shaft 6a protruding from the case body 5a into the cylinder 1 engages with the operating rod 13.
An operating piece 13a provided on the operating rod 13 selectively operates limit switches 14a, 14b, and 14c.

Furthermore, a fixed body 16 fixed with screws 15 is arranged inside the case body 5a on the upper surface of the intermediate rotating body 7,
The upper end of the rotating shaft 6a is rotatably inserted into the fixed body 16. As shown in FIG. 3, the fixed body 16 has three magnets 17, 1 spaced apart in the circumferential direction.
8 and 19 are buried so that the magnets 17 and 19 have the same magnetic pole direction, and the magnet 18 has the magnetic pole direction opposite to that of the magnets 17 and 19. For example, the fixed body 1 of the magnet pin 10
When the part facing magnet 6 is the N pole, magnet 1
For magnets 7 and 19, the portion facing the intermediate rotating body 7 is the south pole, and for the magnet 18, the portion facing the intermediate rotating body 7 is the north pole.

Further, a plurality of recesses 20 are formed on the surface of the driven rotary body 6 facing the intermediate rotary body 7. The recesses 20 are sized to fit the magnet pins 10 and are provided in the circumferential direction of the driven rotating body 6, and the intervals between the recesses 20 are equal to the distance between the magnets 1 embedded in the fixed body 16.
7 and 18 or the spacing between magnets 18 and 19.

Next, the operation of the mechanism according to the present invention will be explained based on FIGS. 4A to 4C.

First, assume that the state shown in FIG. 4A is the reference position. In this state, the magnet pin 10 is
is repelled, and the end of the magnet pin 10 hits the driven rotating body 6.
It fits into the recess 20 of. When the intermediate rotating body 7 is rotated in the direction of the arrow a by externally operating the tension member 12 from this state, the intermediate rotating body 7 and the driven rotating body 6 are connected via the magnet pin 10 as shown in FIG. 4B. are engaged, so the driven rotating body 6 also rotates integrally. This rotation causes the operation piece 1 to
3a moves away from the limit switch 14a and toward the limit switch 14b. Furthermore, when the intermediate rotating body 7 rotates and the magnet pin 10 comes to the position of the magnet 19,
As shown in FIG. 4C, the magnet pin 10 is attracted and comes out of the recess 20. In this state, tension member 1
2, the engagement between the intermediate rotating body 7 and the driven rotating body 6 has been released, so that only the intermediate rotating body 7 is reversely rotated in the direction b by the tensile force of the return spring 11. When the magnet pin 10 comes to the position of the magnet 18 again, the magnet pin 10 is repelled by the magnet 18 and fits into another recess 20 adjacent to the recess 20. When the tension member 12 is externally operated again, the driven rotating body 5 rotates by the same action as described above, and the limit switch 14c is operated by the operating piece 13a.

In addition, in the above operation explanation, the magnets 18 and 19
Although an example has been shown in which the magnet pin 10 of the intermediate rotating body 7 is attracted and repelled in between, it can be moved from the reference position shown in FIG. The intermediate rotating body 7 can also be rotated in the C direction. In this case, the magnet 17 acts in the same manner as the magnet 19, and the operating piece 13a moves away from the limit switch 14a and toward the limit switch 14c, and further from the limit switch 14c toward the limit switch 14b.

Furthermore, the mechanism according to the present invention can be applied not only to actuating a predetermined limit switch in electrical equipment, but also to all kinds of uses, an example of which is shown in FIG. FIG. 5 shows an example in which the damping force adjustment of a shock absorber is applied. In this shock absorber, a hollow rod 23 having a piston 22 fixed thereon is slidably fitted into a cylinder 21, and the driven rotation is inserted into the hollow rod 23. Insert the rotating shaft 6a extending from the body, and
The damping force is adjusted by aligning the orifice holes 24a of the plate body 24, which has a plurality of orifice holes 24a formed at the lower end thereof, with the oil holes 25. Here, the orifice hole 24a corresponds to the operating piece 13a described in the first to third embodiments.

6 to 9 are diagrams showing other examples of the fixed body, and in the example shown in FIG. 6, two magnets 26 and 27 with different magnetic pole directions are embedded in the fixed body 16. . When using the fixed body 16 having such a structure,
The driven rotating body 6 rotates intermittently only in a fixed direction.

In addition, in the example shown in FIG. 7, a plurality of magnets 28 are embedded at equal intervals in the circumferential direction of the fixed body 16, and with this structure, the continuous rotation of the intermediate rotary body 7 is converted into driven rotation. It can be replaced by continuous intermittent rotation of the body 6. However, in this case, it is necessary to wrap the tension member 12 around the intermediate rotating body so that the intermediate rotating body 7 rotates more than once in one tensioning operation.

FIG. 8 shows an example in which the fixed body 16 itself is made of a permanent magnet. With this configuration, the same effect as when three magnets are buried is achieved. However, for positioning during assembly, it is more advantageous to embed the magnet.

Furthermore, in the example shown in FIG. 9, magnets 31, 31, 32, 32,
33 are buried. Here, the magnets 31, 31 have the same magnetic pole direction, and the magnets 32, 32, 33 have magnetic poles in the opposite direction to the magnet 31. For example, when the portion of the magnet pin 10 facing the fixed body 16 is set as the south pole, the portion of the magnet 31 facing the intermediate rotating body 7 is set as the north pole. Further, the spacing between the recesses 20, 20 and the spacing between the magnets 31, 33 are made equal, and the magnet 3
1 and the magnet 32 are buried close to each other.

With such a configuration, the attraction effect by the magnet 31 will be exerted only when the magnet 31 and the magnet pin 10 are in the same position. Therefore, when the intermediate rotating body 7 and the driven rotating body 6 are engaged and rotated together, the magnet pin 10 is attracted by the magnet 31 and does not come off from the recess 20. Therefore, the engagement/disengagement position between the intermediate rotating body 7 and the driven rotating body 6 can be determined accurately.

In addition, in the case of the present invention, since the frequency of collision between the magnet and the magnet pin is high, in order to extend the life of these parts, it is possible to coat at least one of the magnet or the magnet pin with aluminum foil or a resin film. good.

(Effects of the invention) As explained above, according to the invention, a fixed body is superimposed on one surface of the intermediate rotating body that is rotated by externally operating the tension member, and the fixed body is superimposed on the ground in driven rotation, and the magnet provided on the intermediate rotating body is By attracting or repelling the pin to a magnet provided on the fixed body, the intermediate rotating body and the driven rotating body are engaged and disengaged, the rotational motion of the intermediate rotating body is intermittently transmitted to the driven rotating body, and the driven rotating body The mechanism can be rotated by a desired angle, making it significantly more compact than conventional intermittent rotation mechanisms, and reducing the noise associated with operation.Furthermore, the mechanism itself is easy to assemble, and high-speed operation is ensured. It has many effects such as:

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of the mechanism according to the present invention, Fig. 2 is a plan view of the same mechanism, Fig. 3 is an exploded perspective view of the main components constituting the mechanism according to the present invention, and Figs. 4 A to C.
10 is a perspective view illustrating the operation of the mechanism according to the present invention, FIG.
The figure shows a conventional mechanism. In the drawings, 1 is a cylinder, 5 is a case, 6 is a driven rotating body, 7 is an intermediate rotating body, 8 is an arm, 9 is a through hole, 11 is a lintern spring, 12 is a tension member, 10 is a magnet pin, 16 is a fixed body, 17,1
8, 19, 26, 27, 28, 29, 30, 3
1, 32, and 33 are magnet parts, and 20 is a recessed part.

Claims (1)

[Scope of utility model registration request] an intermediate rotating body having an arm housed in a case and protruding from a peripheral surface; a return spring interposed between the arm and the case; and one end fixed to the arm and biased by the return spring. a tension member that pulls in a direction opposite to that of the intermediate rotating body; a magnet pin that is slidably inserted into a through hole formed in the thickness direction of the intermediate rotating body; A fixed body in which a magnet part whose part facing the intermediate rotating body is the north pole and a magnet part which is the south pole are provided spaced apart or adjacent to each other in the circumferential direction, and a fixed body is provided in the case so as to overlap the other surface of the intermediate rotating body. An intermittent rotation mechanism characterized by comprising a driven rotary body having a plurality of recesses provided in the circumferential direction at intervals equal to the intervals of the magnet parts, into which magnet pins inserted into the intermediate rotary body fit.