JPH08226511A - Rotation transmitting mechanism of timepiece and portable timepiece - Google Patents

Abstract

PURPOSE: To provide a rotation transmitting device able to decrease torque fluctuation and transmission loss, able to take the large speed increasing ratio, and dispensing with any specialized shock absorbing mechanism in transmitting of the rotation of a rotary weight loaded in a timepiece. CONSTITUTION: A mechanism for using magnetic connection by magnets 50, 51 is adopted in order to transmit the rotational motion of a rotary weight 12 to an intermediate wheel 14. The rotational motion of the rotary weight wheel 13 to be interlocked with the rotary weight 12 is transmitted to an intermediate wheel end 14a of the intermediate wheel 14 through the magnets 50, 51. Electric current is generated on a generating coil 17 and charged into a secondary battery 1 after the torque is transmitted to a power generating rotor 15. A magnetic shielding mechanism is constituted of the rotary weight wheel 13 and the intermediate wheel end 14a, and the magnetic influence to a rotor 5 of a step motor, a stator 4, a coil block 3, etc., is restrained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission mechanism for rotating force in a timepiece, and more particularly to a transmission mechanism using magnetic force.

[0002]

2. Description of the Related Art Most of the rotation transmission mechanisms used in timepieces are meshing gears. As an example, a watch equipped with a power generation mechanism for generating power by movement of an arm based on a general quartz timepiece equipped with a step motor described in Japanese Patent Laid-Open No. 52-82478 is shown in FIG. explain.

In FIG. 7, reference numeral 12 denotes a one-sided rotary weight that rotates according to a change in the attitude of the timepiece, and together with an interlocked rotary weight wheel 33, a set screw 22 is attached to an inner ring 21a of a ball bearing 21, which is a rotary shaft. It is fixed. The intermediate wheel 34 has a pinion 34a meshing with the rotary weight wheel 33, and a gear part 34b meshing with the pinion 15a of the power generation rotor 15 having the permanent magnet 15b to transmit the rotation. Rotary weight 1
The rotation of 2 is accelerated to the generator rotor 15 by about 100 times. The gear portion 34b of the intermediate wheel 34 is guided by the backlash with the main body portion 34d, and is fixed by the pressing spring 23 with a spring force. Due to the rotation of the power generation rotor 15, the magnetic flux links the power generation coil 17 via the power generation stator 16 to generate power.
Then, the generated current is charged in the secondary power supply. The power generation stator 16 and the power generation coil 17 are fixed by a set screw 18 to a main plate 19 which is a base of the timepiece body. The intermediate wheel 34 and the power generation rotor 15 are axially supported by bearing members 20a and 20b whose upper and lower tenon portions are fixed to the rotary weight receiver 20 and bearing members 19a and 19b fixed to the main plate 19, respectively. . The outer ring 21b of the ball belling 21 is fixed to the rotary weight receiver 20 by crimping, and the rotary weight bearing 20 is screwed to the main plate 19 at another portion.

Further, Japanese Patent Application Laid-Open No. 61-153048 has been proposed as a general rotation transmission mechanism using a magnet. In this system, a magnet having a circular cross section is attracted between disc-shaped magnetic bodies provided on a main shaft and a driven shaft, and rotation is transmitted by the magnetic force. The aim is to replace the rotary table of a player, which was conventionally driven by a belt drive or a rim drive, with a magnet, thereby making it possible to secure a small size and a large reduction ratio with little torque fluctuation.

[0005]

Among the above-described rotation transmission mechanisms, the following problems are associated with the power generation train wheel as disclosed in Japanese Patent Laid-Open No. 52-82478.

In a portable timepiece, in order to ensure power generation performance, the rotary weight 12 is rotated up to about 10 times to the power generation rotor 15.
It is necessary to speed up to 0 times. In order to perform this in two stages of meshing, a large speed increasing ratio of approximately 10 times per stage is required. For that purpose, the point of miniaturization is to reduce the number of teeth of the kana as much as possible. However, in the case of a gear and a pinion, the number of teeth of pinion is generally 6 because of the meshing relationship.
You need more than one. In addition, in order to transmit the force of the rotary weight 12, it is necessary to have a sufficient tooth profile strength to withstand the force,
There are limits to miniaturization. Further, in the above case, the intermediate car 34
Since the pinion portion 34a is a separate body and the shaft portion 34c is driven into the main body portion, the root diameter of the pinion increases by that amount and the entire tooth profile also increases.

Regarding the transmission performance, in the case of meshing with the gear and the pinion, torque fluctuation is always generated and the transmission efficiency is reduced. In particular, in the case of meshing where the speed increasing ratio is large, this variation becomes large and is also less susceptible to variations in the center distance.

When the rotary weight 12 rapidly rotates, the intermediate wheel 34 has a slip mechanism for absorbing shock so that the transmission wheel train cannot follow the rotation due to inertia or the like and a part of the wheel train is not damaged. Are required, which is disadvantageous in terms of cost and space.

Next, the method using a magnet as described in JP-A-61-153048 has the above-mentioned advantages as a transmission mechanism, but is generally used for large equipment. There is no proposal to use it for small devices such as mobile watches. This is because the motor of the current mainstream portable quartz timepiece has a characteristic that its performance is affected by other magnetic fields. That is, installing a mechanism using a magnet near a member using magnetic force, such as a motor, adversely affects the operation of the motor due to the magnetic force of this magnet and impairs the function as a timepiece. Because. Therefore, it has been conventionally unsuitable to adopt a transmission mechanism using a magnet in a small timepiece such as a portable timepiece.

Further, it has been naturally considered that the rotation angle of the motor must be accurately transmitted in order to keep time, and that transmission by gears is optimal for that purpose.

In view of this, the present invention employs a magnet that has been unsuitable for conventional timepieces, so that it is possible to secure a large speed increasing ratio despite its small size, to enable rotation transmission with little torque fluctuation, and a shock absorbing mechanism. It is an object of the present invention to provide a rotation transmission mechanism of a timepiece that has both of the above and does not adversely affect other members such as a motor that uses magnetic force.

[0012]

A rotation transmission mechanism of a timepiece according to the invention has two rotating members, a first and a second rotating members each having a cylindrical portion made of a magnetic material, and at least one cylindrical magnet. Then, this cylindrical magnet is attracted to the outer circumferences of the cylindrical portions of both rotary members by magnetic force, and the rotation of one rotary member is transmitted to the other rotary member by the attraction force of the cylindrical magnets. It is characterized by having a magnetic shielding mechanism for suppressing the influence of the magnetic force of the cylindrical magnet on the member.

In this case, the rotating members are axially supported by the supporting member so that the cylindrical portions do not overlap each other, and two cylindrical magnets are used, and the first cylindrical magnet is connected to the outer circumferences of the cylindrical portions of both rotating members. The magnetic force is attracted on the side of, and the second cylindrical magnet is attracted on the other side.
It is preferable that the rotary member is configured so that the bidirectional rotation of the rotary member is transmitted to the second rotary member.

Alternatively, the second rotating member has a cylindrical magnet, and the outer periphery of the cylindrical portion of the first rotating member and the outer periphery of the cylindrical magnet of the second rotating member are brought into contact with each other to be axially supported by the supporting member. It is desirable that the rotary motion of the first rotary member be transmitted to the second rotary member by the attraction force by the magnetic force of the cylindrical portion of the first rotary member and the magnet of the second rotary member.

Further, the rotation transmission mechanism of such a timepiece is
It is preferable that the portable timepiece is configured by being mounted as a transmission mechanism that transmits the rotation of the rotary weight whose center of gravity and the center of rotation are eccentric.

[0016]

The transmission mechanism of the timepiece according to the present invention is constructed so as to transmit the rotational force using the magnet and not to exert a magnetic influence on other members using the magnetic force (in particular, the step motor). . That is, as in the invention described in claim 1, the power coupling between the two rotating members (first rotating member, second rotating member) via at least one cylindrical rotatable magnet ( It is provided with a magnetic shield mechanism that prevents the magnetic force of this magnet from affecting other mechanisms using the magnetic force. The magnetic shielding mechanism here needs to have a shielding property that does not adversely affect the operation of other members using magnetic force, and does not necessarily need to be magnetically sealed. The most desirable method of magnetic shielding is to secure a distance between this magnet and another mechanism that uses magnetic force as much as possible. However, according to the experiments by the present inventors, it is possible to detect a small device such as a portable timepiece. It has proved difficult to secure a sufficient distance for magnetic shielding if the case. Therefore, the above problem is solved by providing a physical magnetic shield mechanism around the magnet. Further, since the rotation transmission mechanism uses a magnet, it is possible to improve various problems caused by the meshing of gears.

The inventions set forth in claims 2 and 3 describe a preferred form of the cylindrical magnet for transmitting the rotational force.

According to the second aspect of the present invention, the first and second magnets are used to effectively not only rotate the first rotating member in one direction but also rotate in both directions. It is intended to be transmitted to the rotating member. That is, when the direction in which the magnet is attracted to the second rotating member matches the direction in which the first rotating member rotates, the rotational force is easily transmitted effectively, so that the rotation of each of the first rotating members is facilitated. By arranging two magnets corresponding to the directions, effective transmission of the rotational force is achieved.

According to the third aspect of the invention, the second rotating member is arranged so as to incorporate a magnet therein. In this case, the space between the first rotating member and the second rotating member can be reduced and the number of parts can be reduced. Further, since it becomes possible to stably transmit the rotational force regardless of the rotation direction of the first rotating member,
Only one magnet should be used.

According to a fourth aspect of the present invention, the rotation transmission mechanism described above is applied to the rotation transmission of the rotary weight in the portable timepiece. This rotary weight is used as an energy source of a power generation mechanism for obtaining electric power for driving a portable timepiece, and its rotating direction is arbitrary, and also performs irregular and sudden rotary motion. It is characterized by that. Further, in order to obtain sufficient generated power, the rotary motion of the rotary weight is accelerated at a considerable ratio. The present invention is to solve all of the disadvantages inherent in the rotation transmission of a rotation transmission mechanism using a gear that is normally used (difficult to downsize the tooth profile, torque variation, and a slip mechanism for shock absorption are required). It is a particularly suitable mechanism for transmitting the rotational force of the rotary weight that performs a special rotary motion.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

[Embodiment 1] FIG. 1 is a plan view showing a first embodiment of the present invention, FIG. 2 is a sectional view thereof, and FIGS. First, the overall configuration of the main part of a portable timepiece using the rotation transmission mechanism of the present invention will be described.

In FIGS. 1 and 2, 1 is a rechargeable secondary power source (large-capacity capacitor), 2 is a winding stem as an external operating member, 3 is a coil block constituting a step motor,
4 is a stator, 5 is a rotor, 6 is a fifth wheel, 7 is a fourth wheel to which a second hand is attached, 8 is a third wheel, 9 is a day wheel, 10 is a small iron wheel, and 11 is a clutch wheel. The above are the main constituent members for driving the hands of the timepiece.

Next, the structure of the power generation mechanism for supplying the generated power to the secondary power source 1 will be described. As a part of this power generation mechanism, 12 is a center of gravity that rotates due to a change in the attitude of the timepiece and a single-weight rotary weight whose center of rotation is eccentric.
Reference numeral 50 is a rotary spindle wheel made of a magnetic material that is interlocked with the rotation of the rotary spindle 12, 50 and 51 are cylindrical magnets attracted to the outer circumference of the rotary spindle wheel 12 by magnetic force, and 14 is also a magnet 50 and 51 and a magnetic body. An intermediate wheel that is attracted to the end portion 14a by magnetic force is shown. The intermediate wheel 14 has a gear portion 14b and meshes with a pinion portion 15a of a power generation rotor 15 having a permanent magnet 15b. Reference numeral 16 denotes a power generating stator, 17 denotes a power generating coil, and a set screw 18 serves as a base plate 19 as a base of the timepiece body.
It is fixed to. The intermediate wheel 14 and the power generation rotor 15 have bearing members 20a and 20b whose upper and lower tenon portions are fixed to the rotary weight receiver 20, respectively, and a bearing member 1 which is fixed to the main plate 19.
It is pivotally supported by a support member composed of 9a and 19b.
The rotary weight 12 and the rotary weight wheel 13 are guided by an inner ring 21 a of a ball bearing 21, which is a support member, and fixed by a set screw 22. Also, the outer ring 2 of the ball belling 21
1b is fixed to the rotary weight receiver 20 by caulking,
Is screwed to the main plate 19 at other portions.

Next, the operation of the clock section will be described. A step motor drive signal is output to the coil block 3 from a circuit (not shown) every second, and accordingly, the rotor 5 rotates every 180 °. The rotation is reduced to 1/30 via the fifth wheel 6 and transmitted to the fourth wheel 7 which is the second wheel. Furthermore, the rotation is 1/60 through the third wheel.
Is transmitted to the minute wheel (not shown), and further to the hour wheel (not shown) via the back wheel 9 of the day.

On the other hand, regarding the operation of the power generation mechanism, first, when the arm wearing the portable timepiece moves, the rotary weight 12 rotates, and the rotary weight wheel 13 rotates in conjunction therewith. The rotation of the intermediate wheel 1 is performed through magnets 50 and 51 attracted by magnetic force.
4 and the power generation rotor 15. This train wheel is a speed-up train wheel, and when the rotary weight 12 makes one revolution, the power generation rotor 15 makes about 100 revolutions. Then, the magnetic flux generated from the magnet 15b of the power generation rotor 15 flows into the power generation coil 17 via the power generation stator 16 and a power generation current is generated in the coil by the electromagnetic induction effect. This is rectified by a diode or the like to charge the secondary power supply 1. Using this as a power source, the timepiece drive circuit is operated to drive the aforementioned step motor. Next, the magnets 50, 51 are transferred from the rotary spindle 13 to the intermediate wheel 14.
A portion for transmitting the rotation via will be described in detail with reference to FIG.

Since the cylindrical magnets 50 and 51 are vertically magnetized, the magnetic flux generated from the magnets is closed in the arrow direction. Since the rotary spindle 13 and the intermediate wheel end portion 14a have a thickness substantially equal to or larger than the thickness of the magnet, most of the magnetic flux from the magnet does not leak to the other. That is, the rotary weight wheel 13 and the intermediate wheel end portion 14a constitute a magnetic shield mechanism. With this magnetic shield mechanism, it is possible to suppress adverse effects particularly on the rotational drive of the step motor. It should be noted that the rotary spindle 13 does not have to be made entirely of a magnetic material, or may have a magnetic material only at the attracting portion for the magnets 50 and 51.

The speed increasing ratio is determined by the outer diameter of the rotary spindle 13 and the outer diameter of the intermediate wheel end portion 14a. In the conventional example shown in FIG. 7, the outer diameter of the pinion 34a of the intermediate wheel is increased to some extent because of the meshing of gears, but in this example, there is no tooth profile, so the diameter can be reduced. As a result, it becomes possible to take a larger speed increasing ratio than the conventional one.

As a result, the upper tenon diameter 14c of the intermediate wheel 14
Can be reduced, and the bearing loss can be reduced. Further, when there is a pinion, it must be separated from the main body, but in this example, it can be integrated with the intermediate car body, which is advantageous in terms of cost and eccentricity.

The reason for using two magnets, 50 and 51, is to reliably transmit the rotation without being influenced by the rotation direction of the rotary weight 12. That is, the rotary weight 12 rotates counterclockwise (see FIG.
(In the direction indicated by the arrow), the magnet 50 is
The force is reliably transmitted to the intermediate wheel 14 because it is moved to the side. On the contrary, since a force is applied to the magnet 51 in the direction away from the intermediate wheel 14, sometimes the force is not transmitted.
When the rotary weight 12 rotates in the opposite direction, the magnet 51 works effectively. Since this power generation mechanism is a system that generates power regardless of which direction the rotary weight 12 rotates, it is effective to provide magnets on both sides. However, since these are matters to be determined by the load during rotation, when the load is low,
Alternatively, if the amount of power generation is satisfied only by rotation transmission on one side, one magnet may be used.

Around the magnets 50 and 51, as shown in FIG. 4, the magnets 50 and 51 restrict the direction away from the intermediate wheel end portion 14a of the intermediate wheel 14 and the rotary spindle 13 with some clearance. Protrusions 52 and 53 are provided. this is,
As long as it is non-magnetic, it does not matter whether it is integrated with the rotary weight receiver 20 or a separate body. This role is to regulate the position of the magnet at the time of impact. In the case of this example, the position of the magnet is determined only by its attractive force. Therefore, when an impact is applied such as dropping the timepiece, the magnets may be separated from each car and may not function. However,
When the protrusions 52 and 53 are provided, the position of the magnet is regulated by the protrusion, and then the magnet can be returned to the initial position by the attraction force. The clearance A between the protrusions 52 and 53 and the rotary spindle 13 and the clearance B between the intermediate wheel 14 are
It is set smaller than the diameter of the magnets 50 and 51. As for the vertical direction, as shown in FIG.
0, the upper side is regulated by the rotary weight body 12a. Each is formed of a non-magnetic member.

Since the rotation is transmitted by the attraction force, when a shock such as dropping the watch is applied, the slip and the shock force can be released respectively. In FIG. 7 of the conventional example, therefore, a special structure in which the gear 34b of the intermediate wheel 34 is pressed by the pressing spring 23 has to be taken.
In this example, it is not necessary, which is advantageous in structure, space, and cost.

[Embodiment 2] Next, another embodiment of the present invention will be described with reference to FIG. In the above-described first embodiment, a separate magnet is provided between the rotary weight wheel 13 and the intermediate wheel 14.
The present embodiment is characterized in that the intermediate wheel itself is provided with a magnet. FIG. 5 is a sectional view of a main part of a rotation transmission mechanism showing a second embodiment of the present invention, and FIG.
Is equivalent to

In the figure, 40 is a cylindrical magnet, which is guided in the radial direction to the shaft portion of a magnet seat 45 made of a non-magnetic material and is fixed by adhesion or the like.
It is fixed to 4. The magnet 40 is vertically magnetized and attracted to the rotary spindle 13 made of a magnetic material. Other configurations are the same as in the first embodiment.

In the second embodiment, the magnet is directly provided on the intermediate wheel, which is advantageous in terms of reduction of the number of parts and space saving.

Regarding the load torque of the generator, in the above-described first embodiment, the intermediate wheels 14 are attracted to the rotary spindle 13 side by the magnets 50 and 51 to some extent, which becomes the bearing load of the intermediate wheels. However, in the present embodiment, the position of the intermediate wheel 46 that directly abuts against the rotary weight wheel 13 is determined, so that the bearing loss is further reduced.

The upper tenon of the intermediate wheel 14 is guided by the rotary weight receiver 20.
6 and is formed by an elongated hole 20c whose distance from the rotary spindle 13 can be changed, as shown in FIG. As a result, even if there are variations in parts, the rotary spindle wheel 13 and the magnet 40 of the intermediate wheel can be reliably attracted. Alternatively, the play of the bearing portion and the intermediate wheel 14 can be increased to deal with the variation.
However, it should be noted that the meshing amount variation with the next-stage power generation rotor 15 is larger than that of the circular hole.

In the first and second embodiments, the outer shape of the magnet is brought into direct contact with the mating component. However, in order to increase the friction coefficient, the outer circumference is covered with rubber or the upper and lower sides of the magnet are sandwiched by a magnetic material to form a magnetic path. It may be formed.

Although the two magnets are used in the above-described first embodiment, the number of magnets can be further increased. For example, another magnet may be superposed on the magnets 50 and 51. As a result, the reliability of rotation transmission can be further improved. Further, in the second embodiment, an example in which one magnet is used has been described, but the number of magnets may be increased in the same manner.

Further, although the above-mentioned embodiments have been described based on the structure of the electromagnetic induction power generation, the present invention is not limited to this.
It may be used for a transmission train wheel of a power generation system that strikes a piezoelectric element to generate power, a transmission train wheel for winding a mainspring, and the like.

[0041]

The present invention has the following effects due to the above-mentioned structure.

According to the first, second, and third aspects of the present invention, the outer diameter of the kana is not regulated as compared with the rotation transmission by the conventional gear, so that a large deceleration or speedup ratio can be achieved, and the size is small. Suitable for In addition, since it is transmitted by rolling between the outer periphery of the cylindrical portion of the train wheel and the outer periphery of the magnet, it is possible to perform rotation transmission with less transmission loss and less torque fluctuation than with gears. Moreover, no adverse magnetic influence is exerted on other members using magnetic force.

Of these, according to the invention of claim 2,
The rotating force can be stably transmitted regardless of the rotating direction of the first rotating member. According to the third aspect of the invention, the size can be further reduced and the number of parts can be reduced.

If the present invention is used in a transmission mechanism of a timepiece having a rotary weight, the input energy from the rotary weight can be efficiently used, and the mobile phone has good winding performance (power generation performance). Can be made into a watch.
Further, it is possible to slip away from the sudden movement of the rotary weight, and it is possible to reduce the impact on the timepiece parts without using a special mechanism.

[Brief description of drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of FIG.

3 is a cross-sectional view of a main part showing a contact portion between a train wheel and a magnet in FIG.

FIG. 4 is a plan view of a main portion showing a guide portion of the magnet in FIG.

FIG. 5 is a cross-sectional view of essential parts showing a second embodiment of the present invention.

FIG. 6 is a plan view of a main portion showing the intermediate wheel bearing portion of FIG.

FIG. 7 is a cross-sectional view showing a power generation mechanism portion that is an example of a transmission mechanism of a conventional timepiece.

[Explanation of symbols]

 1. Secondary power supply 2. Makishin 3. Coil block 4. Stator 5. Rotor 6. Fifth wheel 7. Fourth wheel 8. Third wheel 9. Back of the sun 10. Small iron car 11. Crawler 12. Slewing weight 13.33. Rotary weight wheel 14.34. Intermediate car 14a. Intermediate car end 14b. Gear part 14c. Upper mortise diameter 15. Power generation rotor 16. Power generation stator 17. Generator coil 18.22. Set screw 19. Ground plate 20. Revolving weight receiver 21. Ball bearing 23. Pressing spring 30. Train wheel bridge 40.50.51. Magnet 45. Magnet seat 52.53. protrusion

Claims (4)

[Claims] 1. A first member having a cylindrical portion formed of a magnetic material,
A second rotating member and at least one cylindrical magnet, and the cylindrical magnet is attracted to the outer circumferences of the cylindrical portions of the first and second rotating members by magnetic force, and the attracting force of the cylindrical magnet A timepiece having a magnetic shield mechanism that transmits the rotation of the first rotating member to the second rotating member and suppresses the influence of the magnetic force of the cylindrical magnet on other members that use magnetic force. Rotation transmission mechanism. 2. The rotating member is axially supported by a supporting member so that the cylindrical portions do not overlap each other, and has first and second cylindrical magnets, and the first cylindrical magnet is the first. And the outer circumference of the cylindrical portion of the second rotating member and the magnetic attraction on one side, and the second cylindrical magnet on the other side,
2. The rotation transmission mechanism of the timepiece according to claim 1, wherein the adsorption force is configured to transmit the bidirectional rotation of the first rotating member to the second rotating member. 3. The second rotating member has the cylindrical magnet, and the outer circumference of the cylindrical portion of the first rotating member and the outer circumference of the cylindrical magnet of the second rotating member are brought into contact with each other so that the shaft is supported by the supporting member. It is configured such that the rotational movement of the first rotating member is transmitted to the second rotating member by the attraction force by the magnetic force of the cylindrical portion of the first rotating member and the magnet of the second rotating member. The rotation transmission mechanism for a timepiece according to claim 1, wherein 4. A portable timepiece equipped with the rotation transmission mechanism for a timepiece according to any one of claims 1 to 3, as a transmission mechanism for transmitting the rotation of a rotary weight whose center of gravity and center of rotation are eccentric.