JP2009257938A - Electrically controlled mechanical clock - Google Patents

Abstract

An electronic device capable of increasing the duration while maintaining the generator size even when the mainspring size is increased, or promoting the miniaturization of the generator while maintaining the duration without changing the mainspring size. To provide a controlled mechanical clock.
SOLUTION: A generator 8 driven by a mechanical energy of a mainspring 10 to generate electric power, driven by electric power generated by the generator 8, and driven by controlling a rotation cycle of the generator 8. An electronically controlled mechanical timepiece 1 provided with a control circuit that brakes the train wheel 20 to regulate the drive train wheel 20, and adds and subtracts train wheel 30 that rotates forward and backward according to the winding and unwinding of the mainspring 10. The solar wheel 47 and an air viscosity adjusting lever 82 that is rotated by the sun wheel 47 and whose planar overlap amount with the rotor inertia plate 9 of the generator 7 changes according to the number of turns of the mainspring 10 are provided. .
[Selection] Figure 1

Description

  The present invention relates to an electronically controlled mechanical timepiece, and more particularly to an electronically controlled mechanical timepiece having a winding wheel train that is driven when the mainspring is wound and a rewinding wheel train that is driven when the mainspring is unwound.

An electronically controlled mechanical timepiece described in Patent Document 1 is known as a watch (watch) that drives a train wheel using a mainspring as a mechanical energy source. Not only in this electronically controlled mechanical timepiece, but in the mainspring generally used in the timepiece, the torque accumulated in the mainspring rapidly increases at the time of final winding tightening. In order to guarantee the accuracy when this large torque is output, the electronically controlled mechanical timepiece applies an electromagnetic brake by a generator.
The maximum brake torque of the electromagnetic brake is determined by the number of coil turns and the number of flux linkages in the generator. The maximum brake torque needs to be larger than the mainspring torque, and the larger the mainspring torque, the larger the maximum brake torque needs to be.

JP-A-8-5758

However, since the maximum brake torque is set in consideration of the balance between the generator size and the required duration, even if a large spring is used to increase the duration, the maximum break torque corresponding to it is set. As an output generator, there is a problem that the number of turns increases and the size increases.
On the other hand, if the maximum brake torque is suppressed in order to reduce the generator size, the output mainspring torque needs to be reduced, and there is a problem that the duration is shortened.

  The object of the present invention is to increase the duration while maintaining the generator size even when the mainspring size is increased, or to promote the downsizing of the generator while maintaining the duration without changing the mainspring size. It is to provide an electronically controlled mechanical clock that can be used.

  An electronically controlled mechanical timepiece according to the present invention includes a mainspring, a generator that is driven by a mechanical power of the mainspring through a train wheel to generate electric power, and is driven by electric power generated by the generator, and the rotation period of the generator An electronically controlled mechanical timepiece including a control circuit that brakes the train wheel by controlling the train wheel to control the train wheel, the rotating body driven by the torque output by the mainspring, A rotating gear that rotates forward and backward according to winding and unwinding of the mainspring, and an air viscosity adjustment that is rotated by the rotating gear and that the amount of planar overlap with the rotating body changes according to the number of windings of the mainspring. And a lever.

According to the present invention, the air viscosity adjusting lever is provided so that the amount of overlap with the rotating body changes in accordance with the number of turns of the mainspring. It can be configured to maximize the air-viscosity resistance generated between the two. Therefore, it can be opposed to the large spring torque from the wound mainspring by the air viscous resistance, and the brake torque by the electromagnetic brake in the generator can be reduced accordingly.
For this reason, the number of coil turns in the generator can be reduced by a small amount of brake torque, and the generator and thus the electronically controlled mechanical timepiece can be reduced in size.
On the other hand, if a generator that generates the same brake torque as before is used, the mainspring torque can be increased by the amount of assist due to air viscosity resistance, so a larger size mainspring is used without changing the generator size. Can extend the duration.

In the electronically controlled mechanical timepiece of the invention, it is desirable that the rotating body is a rotor inertia plate provided in a rotor of the generator.
According to the present invention, since the rotor inertia plate of the rotor that the generator originally has is used, it is not necessary to provide a dedicated rotating body that is branched from the train wheel and driven at high speed, and the number of parts is prevented from greatly increasing. it can.

In the electronically controlled mechanical timepiece according to the invention, the rotating gear includes an winding wheel train that is driven by winding the mainspring and a rewinding wheel train that is driven when the mainspring is wound back. A row of gears is desirable.
According to the present invention, since the rotating gear is a gear constituting an addition / subtraction wheel train, by providing a power reserve display train wheel driven by such a rotating gear, the number of turns of the mainspring can be displayed, Convenience can be improved.

  According to the present invention, by using the air viscous resistance as a load when the mainspring is unwound, the electromagnetic brake in the generator can be assisted, and the brake torque by the electromagnetic brake can be reduced. As a result, even when the mainspring size is increased, the duration can be increased while maintaining the generator size, or the generator can be reduced in size while maintaining the duration without changing the mainspring size.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic plan view of an electronically controlled mechanical timepiece 1 according to an embodiment of the present invention. In FIG. 1, an electronically controlled mechanical timepiece 1 displays a mainspring 10, a drive wheel train 20 as a train wheel driven by mechanical energy generated by the mainspring 10, and the remaining mechanical energy of the mainspring 10. And an addition / subtraction wheel train 30 used in the above.

  The mainspring 10 is housed in a barrel 11, and the outer end of the mainspring 10 is fixed to a barrel gear 12 formed on the outer periphery of the barrel 11 when the electronically controlled mechanical timepiece 1 is a manual winding timepiece. When the electronically controlled mechanical timepiece 1 is a self-winding timepiece, the mainspring 10 is brought into contact with the inner periphery of the barrel 11 and when the torque of a predetermined value or more is applied, the mainspring 10 slides with respect to the inner circumference of the barrel 11. It is configured. Further, the inner end of the mainspring 10 is fixed to a barrel 13 provided at the center of the barrel 11, and the barrel 13 is integrally formed with a barrel 14 that can rotate integrally with the square wheel 15. It can be rotated. The square wheel 15 is connected to a winding portion (not shown), and when the winding stem, which is a part of the winding portion, is rotated, the square wheel 15 is rotated and the mainspring 10 is wound up.

  The drive wheel train 20 includes a second wheel 2 that meshes with the barrel wheel 12, a third wheel 3 that meshes with the second wheel 2, a fourth wheel 4 that is arranged coaxially with the second wheel 2 and meshes with the third wheel 3, four. The speed increasing wheel train includes a fifth wheel 5 that meshes with the number wheel 4 and a sixth wheel 6 that meshes with the fifth wheel 5. A minute hand is attached to a cylindrical pinion (not shown) integral with the center wheel & pinion 2, and an hour hand is attached to a hour wheel to which rotation is transmitted from the hour pinion via a minute wheel. A second hand is attached to the tip of the shaft portion of the fourth wheel 4.

  Further, in the electronically controlled mechanical timepiece 1, the rotation of the sixth wheel 6 which is the highest speed is transmitted to the rotor 8 of the generator 7, and the rotation of the rotor 8 is controlled by the electrical energy generated by the generator 7. The drive wheel train 20 is configured to adjust the speed. The rotor 8 is integrally provided with a disc-shaped rotor inertia plate 9 which is a rotating body, and the rotor inertia plate 9 functions to suppress rotation unevenness of the rotor 8. In FIG. 1, the outer diameter dimensions of the second wheel 2 and the fourth wheel 4 are substantially the same, and are therefore shown in a state of being overlapped with each other in the drawing.

  The generator 7 includes a pair of stator bodies 7A and 7A and coils 7B and 7B wound around the stator bodies 7A and 7A, respectively. The coils 7B and 7B and a circuit block (not shown) Are electrically connected. And the electromagnetic brake is applied to the rotor 8 by the control circuit provided in the circuit block, and the hand movement control is performed.

  FIG. 2 shows a partially enlarged view of the addition / subtraction wheel train 30. As shown in FIGS. 1 and 2, the addition / subtraction train wheel 30 includes a winding train wheel 40, a rewind train wheel train 50, and a power reserve display train wheel 60.

  The winding wheel train 40 is engaged with the first planet transmission wheel 41 meshed with the barrel 18, the second planet transmission wheel 42 meshed with the first planet transmission wheel 41, and the second planet transmission wheel 42 meshed with the second planet transmission wheel 42. The three planetary transmission wheel 43, the second solar wheel 44 meshing with the third planetary transmission wheel 43, the first planetary wheel 45A meshing with the second solar wheel 44, and the first planetary wheel 45A are integrated. A planetary wheel 45 having a second planetary wheel 45B, a planetary intermediate wheel 46 which is arranged coaxially with the second sun wheel 44 and fixes the planetary wheel 45 so as to be rotatable on a planetary plane, and meshes with the second planetary wheel 45B. And a sun wheel 47 as a rotating gear.

  On the other hand, the rewind wheel train 50 includes a sun wheel 47 as an output wheel, a planetary wheel 45, a planetary intermediate wheel 46, a fifth planetary transmission wheel 51 meshing with the planetary intermediate wheel 46, and a fifth planetary transmission wheel 51. And a fourth planetary transmission wheel 52 that meshes with. The fourth planetary transmission wheel 52 is meshed with the barrel gear 12.

  The power reserve display train 60 includes an arc gear 61 that meshes with the sun wheel 47, and a power reserve needle wheel 62 that meshes with the arc gear 61 and to which the power reserve needle 63 is fixed. The arc gear 61 has a plurality of teeth partially formed in an arc shape at two locations on a virtual circle centered on the central axis 61 </ b> A, one meshing with the sun wheel 47, and the other being the power reserve needle wheel 62. Is engaged. According to such an arc gear 61, the rotational movement of the sun wheel 47 is transmitted to the power reserve needle wheel 62 via the arc gear 61, so that the degree of freedom of the layout of the power reserve needle 63 can be increased.

  According to the winding wheel train 40, the rewinding wheel train 50 and the power reserve display train wheel 60, when the barrel 14 is rotated by the winding operation of the mainspring 10, the torque is transmitted to the first planetary transmission wheel 41. Are transmitted to the second planetary transmission wheel 42, the third planetary transmission wheel 43, the second sun wheel 44, the planetary wheel 45, and the sun wheel 47. Here, when the mainspring 10 is wound up, the barrel gear 12 is slow to rotate and is almost stopped, so that the planetary intermediate wheel 46 to the fourth planetary transmission wheel 52 are fixed, and the planetary wheel 45 rotates on the spot and moves to the sun. The car 47 is rotated. The torque transmitted to the sun wheel 47 is transmitted to the arc gear 61 and the power reserve needle wheel 62 so that the power reserve needle 63 rotates.

  Further, when the mainspring 10 is unwound, since the barrel 14 is stopped, the first planet transmission wheel 41 to the second sun wheel 44 are stopped. When the barrel gear 12 is rotated, the torque is sequentially decelerated from the fourth planet transmission wheel 52 and transmitted to the fifth planet transmission wheel 51 and the planetary intermediate wheel 46. At this time, since the second solar wheel 44 meshed with the second planetary wheel 45B is stopped, the planetary vehicle 45 revolves while rotating around the second solar wheel 44. As a result, the sun wheel 47 meshing with the first planetary wheel 45 </ b> A rotates in the direction opposite to that during the winding operation of the mainspring 10. The torque transmitted to the sun wheel 47 is transmitted to the arc gear 61 and the power reserve needle wheel 62 so that the power reserve needle 63 rotates in the direction opposite to that during the winding operation.

  In the present embodiment, the reduction ratio from the barrel gear 12 (the barrel 14) to the sun wheel 47 is set to 1/27, and the winding number of the mainspring 10 is “7.5” (the rotation angle is 360). (° × 7.5 = 2700 °), the sun wheel 47, that is, the power reserve needle 63 is set to rotate 100 °. Here, the setting of the reduction ratio and the operating angle of the power reserve hand 63 may be appropriately set according to the size, specifications, etc. of the electronically controlled mechanical timepiece 1.

  When the barrel 14 is rotated, the torque corresponding to the winding amount of the mainspring 10 is transmitted to the sun wheel 47 and added as a rotation in a predetermined direction. When the mainspring 10 is rewound and the barrel gear 12 rotates, the mainspring is rotated. Torque corresponding to the unwinding amount of 10 is transmitted and subtracted as rotation in the opposite direction. Accordingly, the number of turns of the mainspring 10 is calculated by the winding wheel train 40 and the rewinding wheel train 50 including the sun wheel 47 in common, and the number of turns of the mainspring 10 is indicated by the rotational position of the sun wheel 47.

  Here, a sun lever 70 extending outward from the center of the rotating shaft of the sun wheel 47 is fixed. Therefore, the sun lever 70 rotates in conjunction with the sun wheel 47 and operates according to the remaining amount of the mainspring 10 in synchronization with the power reserve needle 63. The sun lever 70 contacts the fifth planetary transmission wheel 51 and locks the rotation of the sun wheel 47 to the return side in a state where the mainspring 10 has been unwound and has reached the duration. As a result, the mainspring 10 is prevented from further rewinding, so that the power reserve needle 63 does not indicate a position further returned from the zero display position, and the situation where the speed adjustment becomes impossible due to insufficient torque does not occur. .

  On the other hand, when the mainspring 10 is completely wound up, the sun lever 70 comes into contact with the pin 71 driven into the main plate 1A, and locks the rotation of the solar wheel 47 toward the winding-up side. This prevents further winding of the mainspring 10, so that the power reserve needle 63 does not indicate a position further advanced from the full display position.

  Below, the most characteristic structure of this invention is demonstrated based on FIG. 2, FIG. FIG. 3 is an enlarged cross-sectional view of the rotor 8 and the sun wheel 47 portion. 2 and 3, the sun wheel 47 is engaged with an arc intermediate gear 80 having the same shape as the arc gear 61 of the power reserve display train 60. An external gear 81 meshes with the arc intermediate gear 80, and an air viscosity adjusting lever 82 having a flat surface with a predetermined area perpendicular to the rotation axis is integrally provided on the external gear 81. Therefore, the arc intermediate gear 80 and the air viscosity adjusting lever 82 also rotate in conjunction with the sun wheel 47 and operate according to the remaining amount of the mainspring 10 in synchronization with the power reserve needle 63.

  In FIG. 2, the position of the air viscosity adjusting lever 82 indicated by the solid line is a position where the mainspring 10 is approximately on the side where the mainspring 10 is wound up, and in terms of the position of the power reserve needle 63, the position where the remaining amount display is substantially full It is in. At this time, the air viscosity adjusting lever 82 is in a position where it enters the maximum with respect to the rotor inertia plate 9 of the rotor 8 so as to be close to the base plate 1A side. In this state, the air viscosity adjusting lever 82 is planarly overlapped with the rotor inertia plate 9 in the maximum area, so that the air viscosity resistance generated in the gap between the rotor inertia plate 9 and the air viscosity adjusting lever 82 is maximized. . As a result, when the mainspring 10 tries to rewind, a very large mainspring torque is output. On the other hand, this air viscous resistance becomes a load, and assists the brake torque of the electromagnetic brake by the generator 7. .

  Such an air viscosity adjusting lever 82 rotates in a direction away from the rotor inertia plate 9 as the mainspring is unwound, and the air viscosity resistance generated between the rotor inertia plate 9 and the air viscosity adjustment lever 82 is reduced. After the mainspring 10 has returned by a predetermined number of turns, the air viscosity adjusting lever 82 is completely removed from the overlapping position of the rotor inertia plate 9, and no air viscous resistance is generated. For this reason, in a state where the mainspring 10 is almost unwound, no air-viscous resistance is generated, and a situation in which the duration is shortened due to the air-viscous resistance does not occur.

Therefore, according to this embodiment, there are the following effects.
That is, in the electronically controlled mechanical timepiece 1 of the present embodiment, the air viscosity adjusting lever 82 whose amount of overlap with the rotor inertia plate 9 changes according to the number of turns of the mainspring 10 is provided, and when the mainspring 10 is rolled up, the rotor inertia Since the amount of overlap between the plate 9 and the air viscosity adjusting lever 82 is maximized and the air viscous resistance generated between them is maximized, the large spring torque output from the wound mainspring 10 is increased. It can be opposed by air viscosity resistance, and the brake torque by the electromagnetic brake can be reduced accordingly.

Therefore, since the electromagnetic brake to be generated may be small for the generator 7, the number of turns of the coil 7B can be reduced, and the downsizing of the generator 7 and the downsizing of the electronic control mechanical timepiece 1 as a whole can be promoted. it can.
In other words, if the generator 7 that generates the brake torque similar to the conventional one is used, even if the mainspring torque output from the mainspring 10 is increased, the air viscous resistance assists the brake torque. it can. For this reason, the mainspring 10 having a larger size can be adopted, and the duration can be extended.

  Since the rotor inertia plate 9 overlapping the air viscosity adjusting lever 82 is positioned on the outer peripheral side of the electronically controlled mechanical timepiece 1, the air viscosity adjusting lever 82 and the arc intermediate gear 80 can be easily arranged, and the layout and shape thereof. Can increase the degree of freedom.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
For example, in the above-described embodiment, the rotor inertia plate 9 is employed as the rotating body according to the present invention. However, the rotating body for generating the air viscous resistance is not limited to this. A dedicated rotating body that is branched from the fifth wheel 5 or the sixth wheel 6 and driven at high speed may be employed. However, as in the above-described embodiment, the rotor inertia plate 9 originally provided as the generator 7 is used as the rotor of the present invention, so that such a dedicated rotor needs to be provided separately from the rotor inertia plate 9. Therefore, the increase in the number of parts can be suppressed.

  In the above embodiment, the addition / subtraction train wheel 30 includes the winding train wheel 40, the rewind train wheel train 50, and the power reserve display train wheel 60, so that the number of turns of the mainspring 10 can be displayed. In the present invention, since it is sufficient to have a configuration in which the air viscous resistance can be varied according to the number of turns of the mainspring 10, it is not always necessary to display the number of turns of the mainspring 10, and the power reserve display train 60 and the like are omitted. Also good.

1 is a schematic plan view showing an electronically controlled mechanical timepiece according to one embodiment of the present invention. The elements on larger scale which show the principal part of the said embodiment. Sectional drawing which shows the said principal part.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Electronically controlled mechanical timepiece, 8 ... Generator, 9 ... Rotor inertia plate which is a rotating body, 10 ... Mainspring, 20 ... Drive train wheel which is a train wheel, 30 ... Addition / subtraction train wheel, 40 ... Winding train wheel, 47 ... a sun wheel that is a rotating gear, 50 ... a rewinding wheel train, 82 ... an air viscosity adjusting lever.

Claims (3)

A mainspring, a generator that is driven by the mechanical energy of the mainspring through a gear train to generate power, and is driven by the electric power generated by the power generator, and brakes the wheel train by controlling the rotation period of the generator. And an electronically controlled mechanical timepiece having a control circuit for adjusting the speed of the train wheel,
A rotating body driven by a torque output by the mainspring;
A rotating gear that rotates forward and backward in response to winding and unwinding of the mainspring;
An electronically controlled mechanical timepiece comprising: an air viscosity adjusting lever that is rotated by the rotating gear and that changes a planar overlap amount with the rotating body according to the number of turns of the mainspring. The electronically controlled mechanical timepiece according to claim 1,
An electronically controlled mechanical timepiece characterized in that the rotating body is a rotor inertia plate provided in a rotor of the generator. The electronically controlled mechanical timepiece according to claim 1 or 2,
The rotating gear is a gear of an addition / subtraction wheel train composed of a winding wheel train driven by winding the mainspring and a rewinding gear train driven by winding the mainspring back. Electronically controlled mechanical clock.

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