JP2002311161A - Eccentricity clock having spindle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an eccentricity clock having a spindle where clocking error due to shock can be reduced. SOLUTION: Buffer materials 72-74 made of an elastic body are provided between a rotary spindle 31 for automatically winding up a spring and a movement 60, thus absorbing vibration that is generated when a rotary spindle 31 deviates from the rotary region of the rotary spindle 31 and collides with the movement 60 using the buffer materials 72 and 74. As a result, even if the rotary spindle 31 tries to be vibrated in an axial direction by shock applied to the clock, the rotary spindle 31 comes into contact with the buffer materials 72-74, hence the vibration of the rotary spindle 31 is attenuated rapidly, thus nearly preventing the clock from advancing due to vibration and reducing clocking error due to shock even if the vibration reaches a speed regulation means such as a generator and a balance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a timepiece with an eccentric weight which obtains mechanical energy for driving a mainspring and a generator by swinging of an eccentric weight provided therein.

[0002]

2. Description of the Related Art Conventionally, the driving of hands such as a minute hand and an hour hand has been performed.
The mechanical energy stored in the mainspring is used, and a hand-operated speed is controlled by a mechanical electronic control timepiece controlled by an electronic circuit (Japanese Patent Laid-Open No. 8-5758). In other words, in a mechanical electronically controlled timepiece, the mechanical energy stored in the mainspring is transmitted to a generator in a wheel train connected with hands, the mechanical energy is converted into electric energy by the generator, and the electric energy is controlled for rotation. The rotation control means controls the rotation speed of a rotor provided in the generator. If a control circuit including an IC and a crystal oscillator is provided as a rotation control means, the hand movement speed can be controlled with high accuracy. Accuracy can be realized, and for high-end products, high accuracy within ± 10 seconds per year can be realized.

[0003] Conventionally, an eccentric weight that is mounted on an arm or the like and swings in response to the movement of the arm or the like is provided, and the torque generated by the eccentric weight is used to wind up a mainspring or rotate a generator. Automatic clocks and clocks with a power generation function are used. As long as the timepiece with the eccentric weight is mounted on the arm or the like, the mainspring is wound up and the generator is driven to rotate automatically, and can be continuously driven semi-permanently without stopping. .

Here, Japanese Patent Application Laid-Open No. 11-223676 discloses a timepiece with an eccentric weight which can prevent damage due to a large impact applied to the eccentric weight. That is, this eccentric weight-equipped timepiece is provided with a movable support member that supports the eccentric weight so as to be able to move radially outward and a pair of support rings that are arranged outside the rotation area of the eccentric weight. When a large impact is applied to the eccentric weight of such an eccentric weight in the rotation direction of the eccentric weight, the eccentric weight moves radially outward, and the outer peripheral edge of the eccentric weight contacts the support ring. As a result, the rotating eccentric weight is frictionally braked, so that even if a large impact is applied, a large torque is not suddenly applied to the generator or the mainspring, and the teeth of gears for transmitting the driving force to the generator and the mainspring are controlled. Damage is prevented. Further, since the pair of support rings are disposed so as to sandwich the outer peripheral portion of the eccentric weight therebetween, even if a large impact is applied to the eccentric weight along the longitudinal direction of the rotating shaft, the support rings on both sides thereof are provided. The ring limits the axial movement of the eccentric weight and does not vibrate the eccentric weight significantly in the axial direction. Thus, even if a large impact is applied, damage to the rotating shaft that rotatably supports the eccentric weight is prevented.

[0005]

In such a timepiece with an eccentric weight, damage due to a large impact can be prevented, but the axial vibration of the eccentric weight due to the impact cannot be rapidly attenuated. When the vibration in the direction continues, in the mechanical electronic timepiece, the vibration due to the impact reaches the train wheel and the generator equipped with a plurality of gears, and the vibration is generated between the rotor provided in the generator and its bearing. The frictional resistance and the frictional resistance between the gears of the train wheel and its bearings are reduced and the watch is advanced, so if it is subjected to frequent shocks, the timekeeping error, which is the indication error of the timekeeping hands, tends to increase. ,
There is a problem. In particular, in a wristwatch that receives a high frequency of impact, there is a high possibility that the timekeeping error will be so large that it cannot be ignored. Further, even in a mechanical timepiece provided with a governor that controls the oscillation cycle of a swinging balance as a rotation control unit, if the axial vibration of the eccentric weight continues, the vibration is generated by a gear forming a wheel train, Frictional resistance with the bearing, and
Since the timepiece is advanced by lowering the frictional resistance between the balance and the bearing, there is a problem that the timekeeping error is liable to be increased when receiving a frequent impact. Similarly, in an analog quartz timepiece that displays time with hands, in the case of generating power by the rotational driving force of the eccentric weight, if the axial vibration of the eccentric weight continues, the vibration forms a wheel train. The frictional resistance between the gear and its bearing is reduced, and the second hand, which advances one second at a time, may advance two seconds or jump two seconds. There is a problem that a time measurement error is likely to increase when subjected to an impact.

An object of the present invention is to provide a timepiece with an eccentric weight in which a time measurement error due to an impact is reduced even when an impact is received.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a timepiece having an eccentric weight, wherein the time is indicated by a pointer and the eccentric weight is swingably provided. A vibration absorbing means for absorbing vibration generated when the vehicle collides with the vehicle. Here, as the eccentric weight, the swingable range is 360.
Oscillating weight that is less than one degree,
In addition, any of the rotary weights whose swingable range is 360 degrees or more and can rotate any number of rotations can be adopted. According to the present invention, even if the eccentric weight attempts to vibrate in the axial direction due to the impact, the eccentric weight contacts the vibration absorbing means, and the vibration of the eccentric weight is absorbed by the vibration absorbing means. Therefore, even if the vibration reaches a speed adjusting means such as a generator or a balance or a wheel train, the clock hardly advances due to the vibration, and a time measurement error due to an impact is reduced.

In the above eccentric weight-equipped timepiece, it is preferable that a vibration absorbing means is provided between the eccentric weight and the movement, and a cushioning material made of an elastic body is adopted. In this way, when the eccentric weight moves toward the movement due to the impact,
First, the contact between the eccentric weight and the movement is prevented because of contact with the cushioning material, and the rotating weight does not vibrate significantly. Moreover, even if the eccentric weight vibrates, the vibration is absorbed by the cushioning material and the vibration of the eccentric weight is rapidly attenuated. , The frictional resistance with the bearing hardly decreases. For this reason, even if an impact is applied, the timepiece hardly advances, and the time measurement error due to the impact is further reduced.

In the timepiece with eccentric weight described above, a relatively soft elastic body made of any of rubber, soft synthetic resin and thermoplastic elastomer can be used as the cushioning material. If a cushioning material made of such a relatively soft elastic body is employed, the cushioning material can be easily deformed even with a small force, so that the cushioning material is flexibly deformed without repelling the movement of the eccentric weight, Even with a thin cushioning material, the vibration of the eccentric weight can be efficiently absorbed, and even if the gap between the eccentric weight and the movement is narrow, the vibration of the eccentric weight can be reliably attenuated. In addition, since the elastic body made of rubber, soft synthetic resin, or thermoplastic elastomer can be easily processed into various shapes, the cushioning material must have a complicated shape to cope with the collision point between the eccentric weight and the movement. Even if it becomes
It is possible to reliably obtain a cushioning material capable of reliably damping the vibration of the eccentric weight without making the production of the cushioning material difficult.

Alternatively, an elastic body formed of a hard metal in a spring shape can be used as the cushioning material. As described above, even the elastic body made of a metal and formed in a spring shape can be easily deformed with a small force, so that the cushioning material is flexibly deformed without repelling the movement of the eccentric weight, and the eccentric weight is not deformed. Vibration is efficiently absorbed. In addition, since the metal elastic body has low frictional resistance on the surface, when the eccentric weight collides with the cushioning material, the amount of swing energy absorbed by the cushioning material from the eccentric weight is reduced, and the eccentric weight is reduced by the cushioning material. , The loss of the oscillating energy of the eccentric weight is reduced.

Further, it is desirable that the cushioning material has an adhesive surface that can be covered with a release paper on the back surface, and is fixed by the adhesive surface. With this configuration, it is not necessary to separately provide a fixing means such as a screw hole in the eccentric weight or the movement when fixing the cushioning material to the eccentric weight or the movement, so that the cushioning material is installed on the designed eccentric weight-equipped timepiece. In this case, it is not necessary to modify the clock with the eccentric weight, and even if the cushioning material is provided, the step of applying the adhesive is not required, and the assembling work of the clock with the eccentric weight is not complicated.

In the above-mentioned eccentric weight-equipped timepiece, the eccentric weight is a rotary weight rotatably provided on the movement, and the rotary weight has an arm rotatably supported by the movement; A weight portion provided at a portion serving as a free end of the arm portion, and the cushioning member is an elastic body provided on one of the rotating weight and the movement and protruding toward the other. Preferably, there is. Here, as the rotating weight, any of those that can rotate in only one of the clockwise and counterclockwise directions and those that can rotate in both the clockwise and counterclockwise directions can be adopted. . According to the above description, by appropriately setting the protrusion size of the cushioning material, when the eccentric weight moves in the direction approaching the movement, the eccentric weight always comes into contact with the cushioning material before contacting the movement. In addition, the direct collision between the eccentric weight and the movement is reliably prevented, and the rotary weight does not vibrate greatly, so that the time measurement error due to the impact is reliably reduced.

In this case, a plurality of elastic bodies scattered on a circumference coaxial with the rotation area of the oscillating weight can be used as the cushioning material. According to this configuration, by appropriately setting the number of cushioning members and their intervals, when the eccentric weight moves in the direction approaching the movement, the eccentric weight contacts the movement regardless of the rotational angle position of the rotating eccentric weight. Before coming into contact with the cushioning material, the collision between the eccentric weight and the movement is reliably prevented, and the rotating weight does not vibrate significantly. Become so.

Alternatively, an elastic body extending along the circumferential direction of the rotation area of the rotary weight can be used as the cushioning material. As described above, if the cushioning material extending along the circumferential direction of the rotation area of the oscillating weight is adopted and arranged on a coaxial circumference with the rotation axis of the oscillating weight, the oscillating weight deviating from the rotation area can be viewed in plan Since the entire overlapping part is in contact at the same time, even if the cushioning material is relatively soft and slender, this cushioning material will receive the vibration of the rotating weight on a sufficiently wide surface and will absorb the vibration quickly. Also from this point, the timing error due to the impact is reduced.

In the above eccentric weight, the rotary weight has a fan shape in plan view, and its outer peripheral edge portion is protruded toward the movement side to be thick. Preferably, the weight portion is provided, and the cushioning material is attached to a portion of the weight portion facing the movement. With this configuration, the cushioning material is provided on the rotating weight side, so that the cushioning material is always disposed between the weight portion and the movement regardless of the rotation angle position of the rotating weight, and the weight portion and the movement In addition to avoiding a direct collision with the cylinder, the shock absorber quickly absorbs the displacement of the weight when the weight is to be displaced by a large impact. Vibration can be reliably absorbed.

At this time, the movement has a surface facing the rotating weight formed in a step-like shape according to the shape of the rotating weight, and the movement has an uppermost step and the rotation It is preferable that a receiving member to which a weight is rotatably attached is provided, and that the cushioning material be attached to an outer peripheral edge of the receiving member. With this configuration, even if the cushioning material is provided at a position close to the rotation axis of the oscillating weight, at this position, the displacement of the oscillating weight is smaller than the outer peripheral edge, and the cushioning material fixed to the movement side is attached to the oscillating weight. It can be provided in close proximity. Thereby, since the received shock is light, the vibration width of the rotary weight is small, and even if the vibration provided by the weight provided on the weight cannot be sufficiently absorbed, the buffer provided at a position close to the rotating shaft is not used. Since the vibration of the oscillating weight is absorbed, even if the vibration is caused by a slight impact, the vibration is quickly damped, and in the case of a large impact, the cushioning material of both the movement and the oscillating weight absorbs the vibration.

Further, in the above-mentioned timepiece with eccentric weight, the rigidity of the arm portion is set so that the natural frequency of the rotary weight when the rotary weight vibrates in a direction intersecting with the rotation surface thereof is 100 Hz or more. Is desirably set. Here, a watch such as a wristwatch or a pocket watch often receives a vibration of a frequency of 50 to 60 Hz under a normal use condition, and the natural frequency of the longitudinal vibration of the rotating weight is 50.
When the frequency is in the vicinity of Ｈｚ60 Hz, the rotating weight resonates and the amplitude increases, so that it easily collides with the movement. When the rotating weight collides with the movement, vibration of a relatively high frequency is generated, and friction between the rotor of the generator or the balance as a speed adjusting means and its bearing, and the gears forming the wheel train are formed. Then, the frictional resistance with the bearing is reduced, so that the possibility that the clock advances is increased. Therefore,
If the rigidity of the arm portion of the oscillating weight is improved as compared with the conventional one and the natural frequency of the oscillating weight becomes 100 Hz or more,
As long as it is used under normal use conditions, the resonance phenomenon of the rotating weight is unlikely to occur, and the frictional resistance between the rotor or balance and the bearing, and the frictional resistance between the gear wheel of the wheel train and the bearing do not decrease, and the watch Is prevented from proceeding.

Further, in the timepiece with the eccentric weight described above, the arm is fixed to a rotation shaft provided on the movement with a screw penetrating the arm, and a head of the screw and the arm are connected to each other. And between the arm and the rotating shaft, it is preferable that damping members for suppressing the longitudinal vibration of the rotating weight are interposed. With this configuration, even if the rotating weight vibrates in a normal rotating operation,
Since the vibration damping material absorbs the vibration of the rotary weight and does not transmit the vibration to the movement side, the vibration does not reach the speed control means such as the generator or the balance, and the time measurement error due to the vibration is reduced.

In the above eccentric weighted timepiece, a relatively soft elastic body made of any of rubber, soft synthetic resin and thermoplastic elastomer can be used as the vibration damping material. If such a damping material made of a relatively soft elastic body is adopted, the damping material can be easily deformed even with a small force, so that the damping material is flexibly deformed without repelling the movement of the eccentric weight. Thus, even the thin damping material can efficiently absorb the vibration of the eccentric weight.

Alternatively, as the vibration damping material, an elastic body formed of a hard metal in a spring shape can be employed.
In this way, even with an elastic body made of metal and formed in a spring shape,
Since it is easily deformed even with a small force, the vibration damping material is flexibly deformed without repelling the movement of the eccentric weight, and the vibration of the eccentric weight can be efficiently absorbed.

Further, it is desirable that the vibration damping material has an adhesive surface on the back surface which can be covered with release paper, and is fixed by the adhesive surface. In this case, if the damping material is attached to the periphery of the screw insertion hole through which the arm portion penetrates, the damping material does not fall off the eccentric weight, so that the damping material may be interposed. The work of attaching the eccentric weight to the movement can be easily performed, and the work of assembling the timepiece with the eccentric weight does not become complicated.

In the above eccentric weight-equipped timepiece, the movement includes a wheel train for transmitting the driving force of the mainspring in order to rotationally drive the hands, and a speed control means for controlling a rotation speed of the hands. Is preferably provided. As described above, a timepiece with an eccentric weight that rotationally drives the hands is always provided with a rotating body such as a generator rotor and a speed control means balance.The rotating shaft of such a rotating body and its rotating axis are When the eccentric weight vibrates due to an impact, the display time of the hands is advanced. However, if the cushioning material as described above is provided and the vibration of the eccentric weight is absorbed by the cushioning material, the vibration of the eccentric weight is quickly attenuated. Therefore, even if the vibration reaches the speed control means such as a generator or a balance, the clock does not remarkably advance due to the vibration, and the time measurement error due to the impact is reduced.

Further, in the timepiece with the eccentric weight described above, a generator is provided to which the driving force of the mainspring is transmitted via the wheel train, and the speed regulating means is a power generated by the generator. It is desirable to operate and control the rotation speed of the rotor provided in the generator. If the above-described cushioning material is provided on the eccentric weight watch that is also such a mechanical electric control timepiece, and the vibration of the eccentric weight is absorbed by the cushioning material, the timekeeping error due to the impact is reduced. In the case of speed control, even if a slight shock is applied to the watch, even if the watch is a popular product, ± 1
High accuracy within 5 seconds and within ± 10 seconds per year for high-end products will be maintained.

In the present invention, as the above-mentioned timepiece with an eccentric weight, the speed adjusting means may be a mechanical timepiece that rotates the escape wheel & pinion at a predetermined rotation speed with an pallet engaged with a periodically vibrating balance. Can be adopted. If such a mechanical timepiece is provided with the cushioning material as described above and the vibration of the eccentric weight is absorbed by the cushioning material, the vibration due to the impact is quickly absorbed, and even if a slight impact is applied to the timepiece, the speed regulation is performed. Since the frictional resistance of the balance of the means, the ankle and the escape wheel, and the gear wheel of the wheel train and its bearings does not decrease, the clock almost does not advance even if an impact is applied, and the accuracy of the indicated time is maintained. become.

Alternatively, in the present invention, as the above-described timepiece with an eccentric weight, the movement includes a wheel train including a plurality of gears to which the hands are connected, a step motor for rotating and driving the wheel train, An analog quartz timepiece provided with a speed control means for controlling the rotation speed of the step motor can also be employed. If such an analog quartz timepiece is provided with the above-mentioned cushioning material and the vibration of the eccentric weight is absorbed by the cushioning material, the vibration due to the impact is quickly absorbed,
Even if a slight shock is applied to the timepiece, the frictional resistance of the gear train and its bearings will not decrease, so that the clock will hardly advance even if an impact is applied, so that the accuracy of the indicated time is maintained. Become.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic structure of a wristwatch 1 which is an eccentric weighted timepiece according to the present embodiment. In FIG. 1, a wristwatch 1 has a barrel provided with a mainspring 11 which is a mechanical energy source for supplying mechanical energy.
10 and a generator 20 that generates electric power with the driving force of the mainspring 11
And an automatic winding mechanism that automatically winds the mainspring 11
30; a wheel train 40 as a driving force transmitting means for transmitting the driving force of the mainspring 11 to the generator 20; and a control circuit 50 as a rotation control means for controlling the rotation speed of the rotor 21 of the generator 20. It is an electronically controlled mechanical clock. The barrel 10 includes a barrel 12 to which the inner end of the mainspring 11 is fixed, a square wheel 13 fixed to the barrel 12, and a barrel wheel 14 engaged with the train wheel 40. I have. Among them, the square wheel 13 is engaged with a round wheel (not shown), the automatic winding mechanism 30 and the kohaze 15, and is prevented from rotating in the reverse direction by engaging with the kohaze 15.

The automatic hoisting mechanism 30 includes a rotary weight 31 as an eccentric weight rotatably provided in both clockwise and counterclockwise directions, and a switching wheel provided between the rotary weight 31 and the square wheel 13. 32, 33 and a transmission car 34. The switching wheel 32 transmits only the clockwise rotational driving force of the rotary weight 31 to the transmission wheel 34 among the rotary driving forces transmitted from the rotary weight 31. Further, the switching wheel 32 transmits the rotational driving force in both the clockwise direction and the counterclockwise direction to the switching wheel 33 at a constant speed. The switching wheel 33 transmits only the clockwise rotation driving force of the switching wheel 32, that is, only the counterclockwise rotation driving force of the rotary weight 31 among the rotation driving forces transmitted from the switching wheel 32. The transmission wheel 34 is driven to rotate only clockwise by the switching wheels 32, 33. And
Even if the rotary weight 31 rotates in any of the clockwise direction and the counterclockwise direction, the automatic winding mechanism 30 automatically winds the mainspring 11 by the rotation driving force. The round hole wheel is also connected to a winding stem (not shown) via a notch wheel (not shown) so that when the crown provided at the end of the winding stem is manually rotated, the mainspring 11 can be wound up. Has become.

The wheel train 40 increases the rotational driving force of the barrel wheel 14 with a plurality of gears from a second wheel & pinion 42 to a fifth wheel & pinion 45 and transmits the rotational driving force to the rotor 21 of the generator 20. The gears 42 to 45 are set with a speed increase ratio for rotating the rotor 21 of the generator 20 at a rotation speed with good power generation efficiency. Also, the second car
A third wheel & pinion 43 is engaged with 42. In this third wheel 43,
A fourth wheel & pinion 44, which is provided coaxially with the second wheel & pinion 42 and rotates separately from the second wheel & pinion 42, is engaged. As a result, the rotational driving force of the center wheel & pinion 42 is increased and transmitted to the center wheel & pinion 44. The hour hand on the rotating shaft of the second wheel & pinion 42
47 is provided, and a minute hand 49 is provided on the rotation shaft of the fourth wheel & pinion 44. The hour hand 47 and the minute hand 49 are time display means. The time display means includes a dial (not shown) engraved with a numeral indicating time and the like. Also, wheel train 40
Are rotatably supported by bearings (not shown).

The generator 20 has a stator 23 having a substantially annular shape and a coil 22 wound around an intermediate portion thereof.
A rotor made of a permanent magnet between the gaps of the stator 23
This is an AC generator with 21 rotatably provided. Here, the number of rotations of the rotor 21 is set so that the generator 20 can generate power efficiently.
The dimension of the gap between the rotor 21 and the stator 23, the material of the permanent magnet forming the rotor 21, the thickness and the number of turns of the coil 22 are appropriately set.

The control circuit 50 generates a braking current flowing through the coil 22 of the generator 20, and applies an electromagnetic braking force to the rotor 21 with the braking current. The control circuit 50 includes a rectifier circuit including a diode and a smoothing capacitor.
51, a current adjustment circuit 52 for adjusting the current flowing through the coil 22, and a rotation speed control circuit for outputting a predetermined control signal corresponding to the rotation speed of the rotor 21 of the generator 20 to the current adjustment circuit 52.
53 are provided. Note that the rectifier circuit 51 and the current adjustment circuit 52 are connected in parallel to both ends of the coil 22 of the generator 20. The AC power obtained by the generator 20 is converted into DC power by the rectifier circuit 51, and this DC power is supplied to the rotation speed control circuit 53. Note that the frequency of the braking current is about one hundred and several tens Hz.

The current adjusting circuit 52 is a circuit in which a switching element such as a transistor and a DC resistor are connected in series, and the ON / OFF operation of the switching element is repeated at a high speed to adjust the ON time with respect to the OFF time. Has become. Thus, the control circuit 50 adjusts the braking current flowing through the coil 22 of the generator 20 to finely adjust the braking force of the electromagnetic brake applied to the rotor 21.

The rotation speed control circuit 53 compares a reference signal obtained from a crystal oscillator (not shown) which always oscillates at a stable frequency with the rotation speed of the rotor 21 detected based on the AC output voltage of the generator 20. By outputting a control signal calculated based on the difference to the current adjustment circuit 52, the rotor
The braking force of the electromagnetic brake applied to the rotor 21 is adjusted so that the rotor 21 rotates at a predetermined rotation speed. As the control signal, for example, a rectangular wave voltage signal in which a High state and a Low state are alternately repeated can be adopted.
When the rotational speed of the rotor 21 is reduced, the ratio of the High state time to the Low state time, in other words, the duty ratio is increased, thereby increasing the braking force of the electromagnetic brake, while increasing the rotor 21 of the generator 20. When the rotation speed of the electromagnetic brake is increased, the duty ratio is reduced, thereby weakening the braking force of the electromagnetic brake.

FIG. 2 shows a movement 60 of the wristwatch 1. The movement 60 integrates the barrel 10, the generator 20, the automatic winding mechanism 30, the wheel train 40, and the control circuit 50 so as to be housed in a case (not shown) provided in the wristwatch 1. In FIG.
In the movement 60, the rotary weight 31 is rotatably provided via a ball bearing 71. As shown in FIG. 3, the rotary weight 31 has a fan-shaped overall planar shape, and its outer peripheral edge portion protrudes in multiple stages toward the movement 60 and is thick. Then, the arm portion in which the thinned portion of the rotating weight 31 is rotatably supported by the movement 60
31A. A lightening hole 31C is formed in the arm 31A in order to give the rotating weight 31 an appropriate rigidity (see FIG. 3). On the other hand, the thickened part of the rotating weight 31
A weight provided at the free end of the arm 31A
31B. The weight 31B is formed of a material having a large specific gravity, such as a tungsten alloy or a gold alloy. Here, the arm 31A has a larger thickness dimension than the arm of the ordinary oscillating weight, an arm having a lightening hole 31C smaller than the arm of the ordinary oscillating weight, and an angle wider than that of the ordinary oscillating weight. It is formed in a fan shape, has a smaller radial dimension than a normal oscillating weight, or is made of a material harder than a normal material forming a oscillating weight, and is larger than a normal arm portion. Rigidity is set. Thus, when the rotating weight 31 longitudinally vibrates in a direction intersecting with the rotating surface due to an impact applied to the wristwatch 1, the natural frequency of the rotating weight 31 is configured to be 100 Hz or more.

As shown in FIG. 4, the movement 60 has a surface facing the rotating weight 31 formed in a step-like shape according to the shape of the rotating weight 31. The movement 60 is provided with a receiving member 61 which forms the uppermost stage and to which the rotary weight 31 is rotatably attached.

Such a rotary weight 31 and the movement 60
As shown in FIG. 2, vibration absorbing means for absorbing vibration generated when the wristwatch 1 receives an impact and the oscillating weight 31 deviates from the rotation area of the oscillating weight 31 and collides with the movement 60 is provided. Is provided. And the vibration absorbing means is rubber,
The cushioning members 72 to 74 are made of a relatively soft elastic body made of either a soft synthetic resin or a thermoplastic elastomer. These cushioning members 72 to 74 extend along the circumferential direction of the rotation area of the rotating weight 31.

That is, as shown in FIG. 3, the weight 31B has
The opposing surface facing the movement 60 is formed in multiple stages,
These surfaces extend along the outer peripheral edge of the rotary weight 31.
Of the cushioning materials 72 to 74 described above, the cushioning materials 72 and 73 are
The elastic body is provided on the 31 side and protrudes toward the movement 60 side. The cushioning member 72 has an elongated shape corresponding to the facing surface 75 that protrudes most toward the movement 60 among the three facing surfaces. The back surface of the cushioning material 72 is an adhesive surface, and the cushioning material 72 is fixed to the facing surface 75 by the adhesive surface. The cushioning member 73 has an elongated shape corresponding to the middle facing surface 76 among the three facing surfaces. The back surface of the cushioning material 73, like the cushioning material 72,
The adhesive surface is used as an adhesive surface.
Fixed to 76.

On the other hand, the receiving member 61 of the movement 60
As shown in the figure, together with the adjacent receiving member 62, a partly cut-out substantially circular plane shape is formed. The notch 77 and the recess 78 for accommodating the head of the screw are provided in the peripheral portion of the receiving member 61 as described above, and the notch 79 is provided in the peripheral portion of the receiving member 62 as described above. Have been. A cushioning member 74 extending along the outer peripheral edges is fixed to the outer peripheral edges of the receiving members 61 and 62. Here, the cushioning member 74 is an elastic body provided on the movement 60 side and protruding toward the rotating weight 31 side. And cushioning material
The 74 has multiple cutouts with different lengths.
The receiving members 61 and 62 are attached to the receiving members 61 and 62, respectively, avoiding the recesses 7 and 79 and the recess 78. The back surface of the cushioning material 74 is
As with 73, it is an adhesive surface, and this adhesive surface
74 is fixed to the receiving members 61 and 62.

FIG. 5 shows the support structure of the rotary weight 31 in an enlarged manner. In FIG. 5, an outer ring 81 of a ball bearing 71 is fixed to a receiving member 61 on the movement 60 side,
An inner ring 83 provided inside the outer ring 81 with the ball 82 interposed therebetween serves as a rotation axis of the rotary weight 31. The oscillating weight 31 is
It is fixed to the inner ring 83 by a screw 84 penetrating the arm 31A.

Here, the rotary weight 31 is provided between the head 84A of the screw 84 and the arm 31A of the rotary weight 31 and between the arm 31A of the rotary weight 31 and the inner ring 83 of the ball bearing 71. , A vibration damping material that suppresses longitudinal vibration that vibrates in a direction that intersects with the plane of rotation 8
5, 86 are interposed respectively. These damping materials 85, 8
Each of 6 is a relatively soft elastic ring made of any of rubber, soft synthetic resin and thermoplastic elastomer. The back surfaces of the vibration damping materials 85 and 86, specifically, the surface facing the arm 31A is an adhesive surface like the cushioning materials 72 to 74. With this adhesive surface, the vibration damping materials 85 and 86 It is fixed to the arm 31A. Before the fixing, the cushioning materials 72 to 73 and the vibration damping materials 85 and 86 had their adhesive surfaces on the back surfaces covered with release paper (not shown). The release paper secures the adhesive strength of the back surfaces of the cushioning materials 72 and 73 until the release paper is fixed.

According to the above-described embodiment, the following effects can be obtained. That is, between the oscillating weight 31 and the movement 60, the cushioning materials 72 to 74 made of an elastic body are provided, and the vibration of the oscillating weight 31 is absorbed by the cushioning materials 72 to 74. Accordingly, even if the rotating weight 31 deviates from the rotation area of the rotating weight 31 and collides with the movement 60, and the rotating weight 31 vibrates due to this collision, the vibration is immediately attenuated and reaches the rotor 21 of the generator 20. However, the wristwatch 1 hardly advances due to the vibration, and the time designation error due to the impact can be reduced. In particular, when the weight 31B is formed of a material having a large specific gravity, the effect of reducing the above-described time designation error becomes more remarkable. Specifically, when the weight 31 having the weight 31B formed of a material having a large specific gravity, such as a tungsten alloy or a gold alloy, is used, the peripheral portion of the weight 31 becomes significantly heavier than the other portions, resulting in an impact. Thereby, the arm 31A is easily bent, and the frequency of collision between the rotary weight 31 and the movement 60 is increased. However,
Between the oscillating weight 31 and the movement 60, the aforementioned cushioning materials 72 to
By providing the 74 and eliminating the direct collision between the rotating weight 31 and the movement 60 and preventing the wristwatch 1 from moving forward, the weight 31B made of a material having a large specific gravity such as a tungsten alloy or a gold alloy can be adopted. , The time designation error can be effectively reduced.

Moreover, by providing the cushioning members 72 to 74 between the oscillating weight 31 and the movement 60, the oscillating weight 31 is prevented from directly colliding with the movement 60, so that the harsh sound generated at the time of collision can be reduced. In addition, it is possible to prevent the movement 60 from being damaged, and to prevent the generation of cuttings due to the collision between the rotating weight 31 and the movement 60. And since the movement 60 will not be scratched, even as a back skeleton with glass fitted in the back cover,
The aesthetic appearance of the wristwatch 1 can be maintained for a long time, and there is no swarf that may be clogged between gears or the like to stop the wheel train 40, so that problems such as the wristwatch 1 stopping unexpectedly during use can be prevented. .

The material of the cushioning members 72 to 74 is rubber,
Employs a relatively soft elastic body made of either soft synthetic resin or thermoplastic elastomer, and cushions even with a small force.
Since the cushions 72 to 74 are easily deformed, the cushioning members 72 to 74 are flexibly deformed without repelling the movement of the rotating weight 31, and the vibration of the rotating weight 31 is reduced even with the thin cushioning materials 72 to 74. , The rotary weight 31 and the movement 60
The vibration of the rotary weight 31 can be surely attenuated even if the gap between the rotating weight 31 is small. In addition, since the elastic body made of any of rubber, soft synthetic resin, and thermoplastic elastomer can be easily processed into various shapes, the cushioning material 72- Even if the 74 has a complicated shape, manufacturing of the cushioning members 72 to 74 does not become difficult, and the cushioning members 72 to 74 capable of reliably damping the vibration of the rotary weight 31 can be obtained reliably and easily. .

Further, since the back surfaces of the cushioning materials 72 to 74 are made to be adhesive surfaces and fixed by this adhesive surface, the cushioning materials 72 to 74 are fixed.
To fix 74, use fixing means such as screw holes
It is not necessary to separately provide the clock 60 with the eccentric weight, and the retrofitting of the clock 1 with the eccentric weight is not necessary, and the cushions 72 to 74 are installed. Even if it does so, the process of applying an adhesive becomes unnecessary, and the assembling work of the eccentric weighted timepiece 1 does not become complicated.

For the weight 31 rotatably provided on the movement 60, the cushioning members 72 to 74 are elastic bodies extending along the circumferential direction of the rotation area of the weight 31. Since the cushioning members 72 to 74 are arranged on the same coaxial circumference, the entire weight of the cushioning members 72 to 74 comes out of the rotation area and overlaps in plan view at the same time, so that the cushioning members 72 to 74 are relatively soft. And, even if it is elongated, the vibration of the oscillating weight 31 is received on a sufficiently wide surface, and the vibration of the oscillating weight 31 can be quickly absorbed. From this point as well, it is possible to reduce the timing error due to the impact. it can.

Further, a rotary weight 31 having a sector shape in plan view, an outer peripheral edge portion thereof protruding toward the movement 60 and having a large thickness, and the thickened portion serving as a weight portion 31B is employed. Then, cushioning members 72, 73 are attached to the portion of the weight portion 31B facing the movement 60, and the cushioning materials 72, 73 are located between the weight portion 31B and the movement 60 regardless of the rotation angle position of the rotating weight 31. Since it is always arranged, the weight 31B
Direct collision between the weight 60 and the movement 60 can be reliably avoided.In addition, if the weight 31B is largely displaced by a large impact, the displacement of the weight 31B is quickly absorbed by the cushioning members 72 and 73. , Vibration of the rotary weight 31 can be reliably and quickly absorbed.

The receiving member 6 forming the uppermost step of the movement 60 in which the surface facing the rotary weight 31 is formed in a step-like shape.
A cushioning material 74 is attached to the outer peripheral edges of the weights 1 and 62, and the surface of the cushioning material 74 facing the rotating weight 31 is provided close to the rotating weight 31, so that the cushioning material 72 provided on the weight 31A is provided. The buffer material 74 absorbs relatively small vibrations that cannot be absorbed by the shock absorbers 73 and 73. Since the absorption is performed, the vibration of the rotary weight 31 can be reliably and promptly absorbed.

Further, the rigidity of the arm 31A is set so that the natural frequency of the longitudinal vibration of the oscillating weight 31 becomes 100 Hz or more, and the oscillating weight 31 does not resonate in normal use. And the movement 60 are less likely to collide with each other, and the frictional resistance between the rotor 21 and the bearing and the frictional resistance between the gears 42 to 45 of the wheel train 40 and the bearing are reduced by the collision between the rotary weight 31 and the movement 60. Is reduced,
The advance of the wristwatch 1 can be prevented.

Further, the arm 31A of the oscillating weight 31 is fixed to the inner ring 83 of the ball bearing 71 provided in the movement 60 by a screw 84 penetrating the arm 31A of the oscillating weight 31.
84 between the head 84A and the arm 31A, and between the arm 31A and the inner ring 83, a vibration damping material 85 for suppressing the longitudinal vibration of the rotating weight 31;
86 are interposed, and the normal weight
Even if 31 vibrates, the vibration of the oscillating weight 31 is absorbed by the damping materials 85 and 86, so that the vibration of the oscillating weight 31
The vibration is hardly transmitted to the side, and the vibration does not reduce the frictional resistance of the bearing of the rotor 21, so that the time measurement error due to the vibration can be reduced.

Further, the vibration damping materials 85 and 86 made of a relatively soft elastic material made of any of rubber, soft synthetic resin and thermoplastic elastomer are employed so that the vibration damping materials 85 and 86 can be easily deformed by a small force. As a result, the vibration damping members 85 and 86 are flexibly deformed without repelling the movement of the rotating weight 31, and the vibration of the rotating weight 31 can be efficiently absorbed even with the thin vibration damping materials 85 and 86. it can.

Further, the back surfaces of the damping materials 85 and 86 are made to be adhesive surfaces, and are fixed by the adhesive surfaces.
When fixing 86, use a fixing means such as a screw hole
It is not necessary to separately provide the eccentric weight watch 1 with the eccentric weight 1, and there is no need to modify the eccentric weight clock 1 when installing the damping materials 85 and 86 on the designed eccentric weight watch 1. By attaching the damping materials 85 and 86 around the insertion holes, the damping materials 85 and 86 do not fall off the rotating weight 31, so that even if the damping materials 85 and 86 are interposed, the rotation The work of attaching the weight 31 to the movement 60 can be easily performed, and the assembling work of the timepiece 1 with the eccentric weight does not become complicated.

Further, the generator 20 is driven by the mainspring 11 through the train wheel 40, and the control circuit 50 having a crystal oscillator is connected to the generator
The above-mentioned cushioning members 72 to 74 are provided in a mechanical electric control timepiece which is operated by electric power of 20 and controls the rotation speed of the rotor 21 of the generator 20 by this control circuit 50, and the rotating weight 31 is Is absorbed, so that the time measurement error due to the impact is reduced, and the high precision of the mechanically controlled timepiece that controls the speed by using the quartz oscillator can be maintained even if it receives an impact.

Note that the present invention is not limited to the above embodiments, but includes the following modifications. That is, the cushioning material and the vibration damping material are not limited to those made of a relatively soft elastic body made of any of rubber, soft synthetic resin and thermoplastic elastomer, but may be an elastic body formed of a hard metal in a spring shape. In this case, if a thin leaf spring or the like that extends in the circumferential direction of the rotation area of the rotating weight is used as the cushioning material, the cushioning material can be easily deformed with a small force. In addition to being able to efficiently absorb the vibration of the oscillating weight, the surface of the metal has low frictional resistance, so even if the oscillating weight collides, the amount of kinetic energy in the rotating direction that the cushioning material absorbs from the oscillating weight becomes small, Even if the vibration of the oscillating weight is absorbed by the cushioning material, the loss of rotational energy of the oscillating weight can be reduced.

The means for fixing the cushioning material and the vibration damping material is not limited to an adhesive type which is fixed with an adhesive provided on the back surface, but may be a screw type which is fixed with a connector such as a screw, or a back surface. The mortise may be of a fixed press-fit type, for example, by press-fitting a tenon in a hole provided on the movement or the eccentric weight side.

Further, the cushioning material provided near the periphery of the case is not limited to an elastic body provided on the rotating weight side and protruding toward the movement, and conversely, provided on the movement side and facing the rotating weight. A projecting elastic body may be used. In short, when the eccentric weight moves in the direction approaching the movement by appropriately setting the projecting dimension,
Before the eccentric weight comes into contact with the movement, the eccentric weight only needs to come into contact with the cushioning material. Similarly, as a cushioning material provided in a radially intermediate portion of the case, provided on the movement side,
The elastic body is not limited to the elastic body protruding toward the oscillating weight, but may be an elastic body provided on the oscillating weight side and protruding toward the movement.

At this time, the cushioning material is not limited to a band-like material extending along the circumferential direction of the rotation area of the rotary weight, but may be a point-like material partially provided on a circumference coaxial with the rotation area of the rotary weight. It may be. For example, as the cushioning material provided on the oscillating weight, as shown in FIG. 6, a point-like cushioning material 72A provided on the outer peripheral edge of the oscillating weight 31 or on a circumference coaxial with the rotation area of the oscillating weight 31, Specifically, as shown in FIG. 7, a plurality of cushioning members 72B scattered on the outer peripheral edge of the rotary weight 31 can be employed. As the cushioning material provided in the movement, a cushioning material provided in a point shape on the circumference coaxial with the rotation area of the rotating weight, or as shown in FIG. 8, a lowermost stage of the movement 60 formed in a step shape is formed. As shown in FIG. 9, a point-shaped buffer 74A may be scattered on the outer periphery of each step of the movement 60, as shown in FIG. In short, when the oscillating weight moves in the direction approaching the movement due to the impact, before the oscillating weight and the movement come into contact, the oscillating weight and the cushioning material, or the movement and the cushioning material come into contact first, in other words,
The dimensions and position of the cushioning material may be set so that the first contact of the rotating weight and the movement becomes the cushioning material.

Further, the automatic winding mechanism switches the direction of the rotational driving force of the rotating weight so that the mainspring can be wound even if the rotating weight rotates in either the clockwise direction or the counterclockwise direction. Not only a switching wheel type having a pair of switching wheels, but also includes a V-shaped pawl lever that swings in conjunction with the rotation of the rotary weight and a ratchet wheel disposed between the V-shaped pawl levers. When the pawl lever swings clockwise, the pawl provided at one end of the V-shape transmits the rotational driving force to the ratchet wheel, and when the pawl lever swings counterclockwise, the other end of the V-shape The pawl provided may be a pawl lever type automatic winding mechanism for transmitting the rotational driving force to the ratchet wheel, and the specific structure of the automatic winding mechanism may be appropriately selected for implementation.

Further, the rotating weight is not limited to the one that can rotate in both clockwise and counterclockwise directions.
It may be one that can rotate only in one of the clockwise direction and the counterclockwise direction. In addition, the eccentric weight has a swingable swing angle of 360 degrees or more, and is not limited to a rotary weight that can rotate for any number of rotations, and the swingable angle is less than 360 degrees, that is, one rotation. An oscillating weight that cannot be used may be used. Further, the rotating weight is not limited to a two-piece shape in which the separately formed arm and weight are joined to each other, and may be a one-piece shape in which the arm and the weight are integrally formed from the beginning, or Three or more divided parts may be joined to each other.

Further, the clock with an eccentric weight is not limited to the one in which the rotation speed of the rotor of the generator is regulated by the control circuit.
A self-winding mechanical watch equipped with speed control means that controls the rotation speed of the escape wheel, with an ankle that is swung by a vibrating balance,
Alternatively, an analog quartz watch with a power generation function may be used, in which a hand is connected to a gear constituting a wheel train and a speed control means for controlling a rotation speed of a step motor for rotating the wheel train is provided. Any self-winding timepiece having a speed control means that supports a rotating body such as a gear forming a wheel train with a bearing may be used. In addition, the clock with the eccentric weight is not limited to the wristwatch, and may be a portable watch of another type.
In short, any watch having an automatic winding mechanism for winding the mainspring by the eccentric weight may be used.

[0059]

As described above, according to the present invention, even when an impact is received, a time measurement error due to the impact can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of the present invention.

FIG. 2 is a sectional view showing the movement of the embodiment.

FIG. 3 is a perspective view showing the oscillating weight of the embodiment.

FIG. 4 is a perspective view showing the movement of the embodiment.

FIG. 5 is an enlarged sectional view showing a main part of the embodiment.

FIG. 6 is a view corresponding to FIG. 3 showing a modified example of the oscillating weight of the present invention.

FIG. 7 is a view corresponding to FIG. 3, showing a different modification of the oscillating weight of the present invention.

FIG. 8 is a view corresponding to FIG. 4 showing a modification of the movement of the present invention.

FIG. 9 is a view corresponding to FIG. 4, showing a different modification of the movement of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wrist watch as an eccentric weight clock 11 Mainspring 20 Generator 21 Rotor 31 Rotating weight as an eccentric weight 31A Arm part 31B Weight part 40 Wheel train 47 Hour hand as a pointer 49 Minute hand as a pointer 50 Control which constitutes speed control means Circuit 60 Movement 61 Receiving member 72,72A, 72B Buffer material 73 Buffer material 74,74A, 74B Buffer material 84 Screw 84A Screw head 85,86 Damping material

Claims (19)

[Claims] 1. An eccentric weight-equipped timepiece having a movement in which a time is displayed by a pointer and an eccentric weight is swingably provided, the vibration generated when the eccentric weight collides with the movement. A timepiece with an eccentric weight, comprising a vibration absorbing means for absorbing vibration. 2. The timepiece with an eccentric weight according to claim 1, wherein the vibration absorbing means is provided between the eccentric weight and the movement, and a cushioning material made of an elastic body is adopted. A clock with an eccentric weight. 3. The timepiece with an eccentric weight according to claim 2, wherein the cushioning material is a relatively soft elastic body made of any of rubber, soft synthetic resin and thermoplastic elastomer. clock. 4. The timepiece with an eccentric weight according to claim 2, wherein the cushioning material is an elastic body formed of a hard metal in a spring shape. 5. The timepiece with an eccentric weight according to claim 2, wherein the cushioning material has an adhesive surface that can be covered with a release paper on a back surface, and is fixed by the adhesive surface. A clock with an eccentric weight, characterized in that: 6. The timepiece with an eccentric weight according to claim 2, wherein the eccentric weight is a rotary weight rotatably provided on the movement, and the rotary weight is the rotation weight. An arm portion rotatably supported on the arm and a weight portion provided at a portion serving as a free end of the arm portion. The cushioning material is provided on one of the rotating weight and the movement. A timepiece with an eccentric weight, characterized by being an elastic body protruding toward the other. 7. The timepiece with an eccentric weight according to claim 6, wherein the shock-absorbing material is an elastic body scattered on a circumference coaxial with a rotation region of the rotary weight. clock. 8. The timepiece with an eccentric weight according to claim 6, wherein the shock-absorbing material is an elastic body extending along a circumferential direction of a rotation region of the rotary weight. 9. The eccentric weight-equipped timepiece according to claim 6, wherein the rotating weight has a fan-shaped planar shape, and an outer peripheral edge portion thereof protrudes toward the movement and is thick. The thickened portion serves as the weight portion, and the cushioning material is attached to a portion of the weight portion facing the movement. Clock with a weight. 10. The timepiece with an eccentric weight according to claim 9, wherein the movement has a surface facing the oscillating weight formed in a step-like shape according to a shape of the oscillating weight. Is provided with a receiving member to which the uppermost step is formed and to which the rotary weight is rotatably attached, and the cushioning material is attached to an outer peripheral edge of the receiving member. Clock. 11. The eccentric weight-equipped timepiece according to claim 6, wherein a natural frequency of the rotating weight is 100 Hz when the rotating weight vibrates longitudinally in a direction intersecting the rotation surface. An eccentric weight-equipped timepiece characterized in that the rigidity of the arm is set as described above. 12. The timepiece with an eccentric weight according to claim 6, wherein the arm is fixed to a rotation shaft provided in the movement with a screw penetrating the arm. Between the head of the screw and the arm, and between the arm and the rotating shaft, a vibration damping material for suppressing the longitudinal vibration of the rotating weight is interposed. A clock with an eccentric weight. 13. An eccentric weight according to claim 12, wherein said vibration damping material is a relatively soft elastic body made of any of rubber, soft synthetic resin and thermoplastic elastomer. Clock. 14. The timepiece with an eccentric weight according to claim 12, wherein the vibration damping material is an elastic body formed of a hard metal in a spring shape. 15. A timepiece with an eccentric weight according to any one of claims 12 to 14, wherein the vibration damping material has an adhesive surface that can be covered with a release paper on a back surface, and is fixed by the adhesive surface. A clock with an eccentric weight, characterized in that it is a thing. 16. The timepiece with an eccentric weight according to any one of claims 1 to 15, wherein the movement comprises:
A timepiece with an eccentric weight, comprising: a mainspring for rotating and driving the hands; a wheel train transmitting the driving force of the mainspring; and a speed control means for controlling a rotation speed of the hands. 17. The timepiece with an eccentric weight according to claim 16, further comprising: a generator to which the driving force of the mainspring is transmitted via the wheel train, wherein the speed adjusting means generates the generator. A clock with an eccentric weight, which operates with electric power and controls the rotation speed of a rotor provided in the generator. 18. The timepiece with an eccentric weight according to claim 16, wherein said speed adjusting means rotates the escape wheel & pinion at a predetermined rotational speed with an pallet engaged with a periodically vibrating balance. A clock with an eccentric weight. 19. The timepiece with an eccentric weight according to claim 1, wherein the movement comprises:
A wheel train including a plurality of gears to which the hands are connected, a step motor for rotating the wheel train, and a speed control means for controlling the rotation speed of the step motor are provided. Clock with eccentric weight.