JPH0324928Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field of the Invention) The present invention relates to a mechanism for converting rotational motion of a motor or the like or linear motion of a cylinder or the like into intermittent rotational motion.

(Prior Art) A ratchet mechanism as shown in FIG. 14 is known as a mechanism for periodically rotating a gear or the like in a fixed direction. This ratchet mechanism has a driven gear 100.
The driving claw 101 and the regulating claw 102 are engaged with each other, and the driven gear 100 is rotated by one rotation of the driving claw 101.
In order to rotate the driven gear 100 by one frame and prevent the driven gear 100 from rotating back, the regulating claw 102
2 is biased toward the driven 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 complicated. It is difficult to assemble into a limited space, the manufacturing of the members that make up the mechanism is troublesome, the noise caused by the collision between the gear and pawl is large, and there is a limit to high-speed operation.

(Purpose of the invention) The present invention was developed in view of the above-mentioned conventional problems.The purpose of the invention is to significantly reduce the size of the device compared to the conventional one, to facilitate the manufacture of component parts, and to reduce operating noise. An object of the present invention is to provide an intermittent rotation mechanism that can reduce intermittent rotation.

(Structure of the invention) In order to achieve the above object, the present invention meshes a driven gear in which a magnetic pin is slidably inserted with a driving gear driven by a motor etc., and a driven gear is attached to one side of the driven gear. Fixed bodies are arranged in such a way that a magnet part whose facing part is the north pole and a magnet part which is the south pole are arranged spaced apart or adjacent to each other in the circumferential direction, and the magnet pin is driven on the other surface of the driven gear. A driven rotary body is provided with recesses into which the gears are fitted when protruding from the gear, and the driven rotary body is provided at intervals equal to the spacing between the magnet parts, and when the driven gear is rotated by the drive gear, the magnet pin is inserted into the magnet part of the fixed body. This attraction and separation causes the magnet pin to move into and out of the recessed portion of the driven rotating body, and the driven gear and the driven rotating body are engaged and disengaged, thereby causing the driven rotating body to rotate intermittently.

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

Fig. 1 is a longitudinal sectional view of the first embodiment of the present invention, and the second
The drawings are a sectional view taken along the line A--A in FIG. 1, FIG. 3 is an exploded perspective view of the main components of the first embodiment, and FIG. 4 is a perspective view showing the operation of the first embodiment.

In the figure, reference numeral 1 denotes a case, and a drive shaft 3 of a motor 2 capable of forward and reverse rotation is inserted into the case 1, and a drive gear 4 is fitted onto the drive shaft 3. Further, a driven rotating body 5 having a rotating shaft 5a is disposed in the case 1, and a driven gear 6 is rotatably fitted onto the rotating shaft 5a of the driven rotating body 5, and the driven gear 6 and the driving gear 4 are engaged. A rotating shaft 5a protruding from the driven gear 6 is rotatably inserted into a fixed body 7 fixed to the case 1. In the figure, the fixed body 7 is assembled on the upper surface of the driven gear 6, and the driven rotating body 5 is assembled on the lower surface thereof.

The driven gear 6 is provided with a through hole 8 that is open on both the surface facing the fixed body 7 and the surface facing the driven rotary body 5, and a magnet shorter than the length of the through hole 8 is provided in the through hole 8. The pin 9 is slidably inserted.

Two magnets 10 and 11 are buried in the fixed body 7 spaced apart in the circumferential direction, and each magnet 10 and 11
The magnetic poles are reversed. For example, for the magnet 10, the portion facing the driven gear 6 is S.
Regarding the poles and magnets 11, the part facing the driven gear 6 is the N pole, and when the driven rotating body 5 is rotated clockwise in FIG. 2, the part of the magnet pin 9 facing the fixed body 7 is the S pole. , the portion facing the driven rotating body 5 is set as the north pole.

Further, a plurality of recesses 12 are formed on the surface of the driven rotary body 5 facing the driven gear 6. The recesses 12 are sized to fit the magnet pins 9 and are provided in the circumferential direction of the driven rotating body 5.
... is made equal to the distance between the magnets 10 and 11 embedded in the fixed body 7. An operating piece 13 is attached to the end of the rotating shaft 5a of the driven rotating body 5 that protrudes from the case 1. This operation piece 1
3 actuates limit switches 14a, 14b, and 14c. For example, when the driven rotary body 5 is at the reference position as shown in FIG. The limit switch 14b is actuated when the driven rotating body 5 rotates by a predetermined angle, and the limit switch 14c is actuated when the driven rotating body 5 further rotates.

Next, the operation of the first embodiment 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 9 is repelled by the magnet 10, and the end of the magnet pin 9 fits into the recess 12 of the driven rotating body 5. From this state, motor 2
When the driven gear 6 is rotated in the direction of the arrow a, the driven gear 6 and the driven rotary body 5 are engaged with each other via the magnet pin 9, as shown in FIG. rotates as one. This rotation causes the operating piece 13 to move away from the limit switch 14a and toward the limit switch 14b. Further, the motor 2 is set so that when the driven gear 6 rotates and the magnet pin 9 reaches the position of the magnet 11, the motor 2 is stopped or reversed. Then, when the magnet pin 9 reaches the position of the magnet 11, the magnet pin 9 is attracted and comes out of the recess 12 as shown in FIG. 4C. If the motor 2 is reversed in this state, the driven gear 6
Since the engagement between the driven rotary body 5 and the driven rotating body 5 is released, only the driven gear 6 rotates in the reverse direction. When the magnet pin 9 comes to the position of the magnet 10 again, the magnet pin 9 is repelled by the magnet 10 and fits into another recess 12 adjacent to the recess 12. At this point, the motor 2 is stopped or rotated forward.
When the motor 2 is rotated in the normal direction again, the driven rotating body 5 rotates by the same action as described above, and the operating piece 13 operates the limit switch 14c.

The mechanism according to the present invention is applicable not only to operating limit switches in electrical equipment, etc., but also to various other uses, one example of which is shown in FIG. Fig. 5 shows an example in which the damping force adjustment of a shock absorber is applied.
A hollow rod 17 to which a rotor 6 is fixed is slidably fitted, a rotating shaft 5a extending from the driven rotating body is inserted into the hollow rod 17, and a plurality of orifice holes 18a are formed at the lower end of this rotating shaft 5a. Plate 1
8 and rotates the rotating shaft 5a to align the predetermined orifice hole 18a and the oil hole 19, thereby adjusting the damping force. Here, the orifice hole 18a corresponds to the operation piece 13.

FIG. 6 is an exploded perspective view showing the second embodiment,
In this embodiment, three magnets 20, 21, 2
2 is buried in the fixed body 7. Each magnet 20,2
1 and 22 are provided in the circumferential direction, and magnet 20 and magnet 2
1 and the spacing between the magnets 21 and 22 are made equal, and the magnetic poles of the magnets 20 and 22 are oriented in the same direction, and the magnetic poles of the magnet 21 are opposite to these. For example, when inserting the magnet pin 9 into the through hole 8 of the driven gear 6 so that the part of the magnet pin 9 facing the fixed body 7 becomes the S pole, the parts of the magnets 20 and 22 facing the driven gear 6 is the N pole, and the portion of the magnet 21 facing the driven gear 6 is the S pole.

The operation is based on the assumption that the reference position is a state in which the magnet 21 and the magnet pin 9 are aligned and the magnet pin 9 is repelled and fitted into the recess 12 of the driven rotary body 5.
When the driven gear 6 is rotated from the reference position in the direction of the arrow a or the direction of the arrow b using a motor capable of forward and reverse rotation, the driven gear 6 and the driven rotating body 5 are engaged with each other via the magnet pin 9. Therefore, the driven rotating body 5 also rotates integrally. Further, when the magnet pin 9 matches the magnet 20 or the magnet 22, the magnet pin 9 is attracted and comes out of the recess 12, and the driven gear 6
Since the engagement with the driven rotary body 5 is released, when the driven gear 6 returns to the reference position and rotates, only the driven gear 6 rotates and the driven rotary body 5 does not rotate.

Therefore, in the first embodiment, for example, after operating the limit switch 14b, the limit switch 14a could not be operated again until the limit switch 14c had been operated once. In the embodiment, by appropriately combining the rotations of the motors, the driven rotating body 5 can be rotated intermittently in either direction.

Although the above example shows a structure in which the magnets are buried spaced apart in the circumferential direction of the fixed body 7, as shown in FIG. 7, the fixed body itself is composed of permanent magnets 23,
The magnet 23 may be divided into a portion 23a where the portion facing the driven gear 6 is the south pole and a portion 23b where the portion is the north pole. However, embedding a pin-shaped magnet in the fixed body 7 is easier to position during assembly and is advantageous in terms of cost.

FIG. 8 shows another example of the fixed body 7, in which the fixed body 7 includes magnets 24, 24, 25, 25,
26 are buried. Here, the magnets 24, 24 have the same magnetic pole direction, and the magnets 25, 25, 26 have magnetic poles in the opposite direction to the magnet 24. For example, if the portion of the magnet pin 9 facing the fixed body 7 is the south pole, the portion of the magnet 24 facing the driven gear 6 is the north pole. Also, the distance between the recesses 12 and the magnet 2
4 and 26 are made equal, and the magnets 24 and 25 are buried close to each other. With such a configuration, the attraction effect of the magnet 24 will be exerted only when the magnet 24 and the magnet pin 9 are in the same position. Therefore, when the driven gear 6 and the driven rotating body 5 are engaged and rotated together, the magnet pin 9 is attracted by the magnet 24 and does not come off from the recess 12. Therefore, the engagement/disengagement position between the driven gear 6 and the driven rotating body 5 can be determined accurately. This arrangement of magnets can also be applied to the other embodiments described above.

FIG. 9 is an exploded perspective view showing the third embodiment,
In this embodiment, the same number of magnets 27 as the number of recesses 12 formed in the driven rotating body 5 are embedded in the fixed body 7. The magnets 27 are arranged so that their magnetic poles are alternately reversed, and the spacing between the magnets 27, 27 and the spacing between the recesses 12, 12 are equal.

Thus, when the driven gear 6 is continuously rotated in one direction, the magnet pin 9 is alternately attracted and repelled by the magnets 27, and when it is attracted to the magnet 27, the driven gear 6 When only the driven gear 6 and the driven rotating body 5 rotate and are repelled by the magnet 27, the driven gear 6 and the driven rotary body 5 rotate integrally. Therefore, in the case of the third embodiment, continuous rotational motion of the motor etc. can be converted into intermittent rotational motion. Further, it is possible to achieve the same effect without using a motor capable of forward and reverse rotation as in the first embodiment.

FIG. 10 is a longitudinal sectional view of the mechanism according to the fourth embodiment,
FIG. 11 is a sectional view taken along line B-B in FIG. 10, and in this embodiment, the drive gear 4 of the above-described embodiment
Rack 28 is used as a. The rack 28 is slidably disposed inside the case 1 and is biased by a spring 29. By pulling a wire 30 or rod fixed to one end of the rack 28 with a cylinder unit or the like, the rack 28 can be moved. The driven gear 6 moves linearly in the direction a, and the driven gear 6 rotates in the direction b together with this movement. At this time, the through hole 8 of the driven gear 6
The magnet pin 9 inserted in
Since the driven gear 6 and the driven rotating body 5
rotates as a unit. At the position where the rack 28 reaches its travel limit, the magnet pin 9 aligns with a magnet (not shown) provided on the fixed body 7, and is attracted by this magnet to release the engagement between the driven gear 6 and the driven rotating body 5. When the rack 28 returns due to the elastic force of the spring 29, only the driven gear 6 rotates.

In addition, in the above description, the case where two magnets were embedded in the fixed body 7 was described, but three or more magnets may be embedded. Also, wire 3
In addition to a cylinder unit and a cam, manual operation can also be considered as a means for pulling zero.

12 and 13 are perspective views showing main parts of the fifth embodiment and the sixth embodiment, respectively. In the fifth embodiment, a helical gear 31 is used as a drive gear for rotating the driven gear 6, and In the sixth embodiment, a worm 32 is used as the drive gear. The other structures of these embodiments are the same as those shown in the first to third embodiments.

(Effects of the invention) As explained above, according to the invention, a fixed body is stacked on one side of the driven gear that meshes with the driven gear, a driven rotating body is stacked on the other side, and a magnet pin inserted into the driven gear is attached to the fixed body. By attracting or repelling the driven gear and the driven rotating body by attracting or repelling the magnetic part provided in the Since the mechanism can be rotated by only 100 degrees, it can be made much smaller than conventional intermittent rotation mechanisms, and the noise associated with operation can be reduced.Furthermore, the mechanism itself is easy to assemble, and high-speed operation can be ensured. It has many effects such as

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of the mechanism according to the first embodiment, Fig. 2 is a cross-sectional view taken along the line A-A in Fig. 1, and Fig. 3 is an exploded perspective view of the main components constituting the mechanism according to the first embodiment. 4A to 4C are perspective views illustrating the operation of the first embodiment, FIG. 5 is a vertical cross-sectional view showing a modified example of the operating section, and FIG. 6 is an exploded perspective view of the main components of the second embodiment. 7 and 8 are perspective views showing separate parts of the fixing body, FIG. 9 is an exploded perspective view of the main components of the third embodiment, and FIG. 10 is a longitudinal section of the mechanism according to the fourth embodiment. Figure 11 is a sectional view taken along line B-B in Figure 10, and Figure 1
Figure 2 is an exploded perspective view of the main components of the fifth embodiment;
Figure 3 is an exploded perspective view of the main components of the sixth embodiment;
FIG. 4 is a plan view of the conventional mechanism. In the drawing, 1 is a case, 4, 28, 31, 32 are drive gears, 5 is a driven rotating body, 6 is a driven gear, 7 is a fixed body, 8 is a through hole, 9 is a magnet pin, 10, 1
1, 20, 21, 22, 23a, 23b, 24,
25, 26, 27 are magnet parts, 12 is a recessed part, and 13 is an operation piece.

Claims (1)

[Scope of utility model registration request] A drive gear connected to a drive source such as a motor or a cylinder unit, a driven gear that meshes with the drive gear and has a through hole formed in the thickness direction, a magnet pin that is slidably inserted into the through hole, and a driven gear that is slidably inserted into the through hole. a fixed body which is provided overlappingly on one surface and has a magnet part whose part facing the driven gear is an N pole and a magnet part which is an S pole, respectively, spaced apart or adjacent to each other in the circumferential direction; and the other surface of the driven gear. an intermittent rotation mechanism comprising a driven rotary body provided with a plurality of recesses in the circumferential direction at intervals equal to the intervals of the magnet parts, and in which the magnet pins inserted into the driven gear are fitted.