JP2574933Y2 - Time difference adjustment mechanism for hands - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time display correcting mechanism of a pointer display type.

[0002]

2. Description of the Related Art There have been proposed various time difference correcting mechanisms for correcting a time difference of an indicator display type by correcting only an hour hand by one hour without stopping the display of a second hand or a minute hand. . As a general structure of the time difference correcting mechanism, the second hour wheel holding the hour hand and the first hour wheel engaging with the Hino back kana are separated, and the two hour wheels are divided into 12 equal parts, that is, one hour. (30 degrees in angle)
There is a mechanism having a mechanism that corrects only the hour hand by one hour by forcibly rotating only the second hour wheel that holds the hour hand when correcting the time difference. However, with such a structure, the hourly index accuracy is not clear, resulting in a slippery correction.

[0003] As another structure, a Hino reverse gear engaged with a minute pinion holding a minute hand and a Hino reverse pinion engaged with an hour wheel holding an hour hand are separated into 12 equal parts of an hour wheel. , Ie 1
The time reduction ratio of the hour wheel (30 degrees in angle) and the reduction gear ratio of the hour wheel are index-coupled, and when the time difference is corrected, only the hour wheel holding the hour hand is forcibly rotated to correct only the hour hand by one hour. Some make it possible. However, in the case of such a structure using two hourly wheels or a reduction ratio configuration of Hino Ura Kana and hourly wheel, the index accuracy for each hour is not clear, and the time difference is corrected. It has a drawback that accurate positioning is difficult.

In order to improve such a structure, as a mechanism for improving the sense of moderation at the time of correcting the time difference by forcible rotation of the hour hand at the time of the above-described index coupling, the rotation shafts of the opposed two-wheeled wheels are opposed to each other. There has also been proposed a configuration in which a plurality of magnets are arranged at designated positions to obtain a sense of moderation by magnetic force. Such a configuration is described, for example, in JP-B-48-3.
No. 6911, for example.

[0005]

However, arranging a plurality of magnets opposed to each other in the direction of the rotation axis of the two wheeled vehicles as proposed in Japanese Patent Publication No. 48-36911 is structurally difficult. It is very difficult to assemble a thick magnet with a large number of parts, and a small number of small magnets in the two-wheeled vehicle. It is difficult to assemble the two-wheeled vehicle. There are drawbacks. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks and to provide a low-cost pointer display type time difference correction mechanism having a simple structure and a small number of parts.

[0006]

To achieve the above object, according to an aspect of the present invention, the partial vehicle for holding the minute hand has a minute pinion, when the hour wheel to hold the needle stem, the winding to the true rotation Linked knob
Car, transmission for transmitting the rotation of the thumbwheel to the hour wheel
In a hand -held timepiece having a car,
A transmission gear formed of a transmission gear and a transmission pinion;
And the transmission pinion are configured to rotate freely with each other, and are coupled to each other by a magnetic force in the radial direction with respect to the rotation axis.
A correction wheel that engages with the winding wheel, and the rotation of the correction wheel
And a correction member for transmitting the data to the control unit.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view of a main part showing a wheel train structure of a timepiece movement according to an embodiment of the present invention, and FIG. 2 is a plan view of a main part showing a magnetic coupling portion between a Hino back gear and a Hino back kana according to an embodiment of the invention. It is.

In FIG. 1, a second wheel 7 at the center of a clock holding a second hand 11, a third wheel 8 meshing with the second wheel 7, and a minute hand 10
, A minute wheel 5 comprising a minute pinion 5a and a minute gear 5b, a Hino reverse gear 1 having a tooth portion 1a, a Hino reverse pinion 2 fitted with a Hino reverse gear 1 and having a kana portion 2a; The hour wheel 6 holding the hour hand 9 meshes with the pinion 2a of the back pinion 2 to form a normal clock reduction wheel train. The Hino reverse gear 1 is rotated with its teeth 1a always meshing with the minute pinion 5a. In the case of the Hino reverse gear 1, the hook 2 a is formed by the tooth 6 of the hour wheel 6.
b and the shaft portion 2b of the Hino back wheel 2 that engages with each other are loosely fitted, and unlike the conventional relationship between the gear and the hook of the back wheel, are configured to be mutually rotatable.

Next, the features of the configuration of the present invention will be described. The front Symbol Date Roh back wheel 1, is coupled stator 3 made of a magnetic material is fixed. The coupling magnet 4 is fixed to the Hino back kana 2 at a substantially same cross-sectional height with a slight gap from the coupling stator 3. And this coupling stator 3
The coupling magnet 4 and the coupling magnet 4 are magnetically coupled to each other in the radial direction as shown in FIG. 2, and are always coupled at a constant magnetically stable position. In order to maintain this magnetic stability, the coupling magnet 4 uses an NS two-pole anisotropic magnet, and the coupling stator 3 has a stepped shape whose semicircle has a semicircle shifted from the center position. doing. With such a configuration, the rotation force of the Hino reverse gear 1 transmitted from the minute pinion 5a during the normal clock operation is such that the Hino reverse pinion 2 is connected to the Hino reverse gear 1 by the magnetic coupling force described above. It rotates integrally and the hour wheel 6
, The minute hand 10 and the hour hand 9 are rotated and the normal time is displayed. In the present invention,
One wheel train transmitting the rotation of the winding stem 12 described above to the hour wheel 6
And selected the Hino back-wheel as an example, but, of course, Makino 12
Transmission having a transmission gear and a transmission pinion, which exists between the
It is possible to construct a magnetic coupling in the carriage.

The hour wheel 6 has a tooth portion 6a that can rotate the hour wheel 6 by manual operation, in addition to a tooth portion 6b that meshes with the Hino back kana 2. The toothed portion 6a is rotatable when the inner boss portion 13a is press-fitted to the large diameter portion 12a of the winding stem 12 and the winding stem is rotated to one side.
Second correction wheel 14 that meshes with the 3 swingably retained Osamu
It is driven to rotate by engaging with the feed claw 15a of the correction lever 15 as a correct member . As described above, the correction lever 15 can rotate the hour wheel 6 by one rotation of the winding stem 12 when the feed pawl portion 15a is engaged with the tooth portion 6a of the hour wheel 6, and the date plate (not shown) 16
A claw portion for rotating and feeding the tooth portion 16a is provided, and by rotating the other side of the winding stem 12, the date plate 16 is rotated and the date plate 16 can also be fast-forwarded.

On the other hand, a small wheel 19 meshes with the tooth portion 1 a of the Hino reverse gear 1, and the pinion wheel 1 meshes with the small wheel 19.
8, the kanuki 17, the mandarin duck 20, and the above-described winding stem 12, etc., constitute a well-known back-around mechanism for time correction. As described above, the correction lever 15 is provided with a pawl (not shown) for rotating and feeding the tooth 16a of the date plate 16, although the feed pawl 15a is engaged with the tooth 6a of the hour wheel 6.
Depending on the rotation direction of the winding stem 12, either the hour wheel 6 or the date plate 16 can be rotationally fed.

Next, the correction operation of the timepiece will be described. At the time of normal time adjustment, it is the same as a conventional timepiece. That is,
The winding stem 12 is pulled out to a two-stage position by a crown (not shown), and the mandrel 20 is operated. Then, the kanuki 17 is operated in the clockwise direction in conjunction with the mandarin duck 20. As a result, the pinwheel 18 and the small iron wheel 19 that engage with the knuckle 17 are operated to a position where they engage. Here, the rotation of the winding stem 12 causes the pinion wheel 18 and the small iron wheel 19 to rotate, and the Hino reverse gear 1 and the minute wheel 5 rotate to correct the minute hand 10. Further, the Hino reverse gear 1 rotates the Hino reverse pinion 2 by the magnetic coupling described above. As a result, the hour wheel 6 meshing with the back cover 2 rotates to correct the hour hand 9. In addition, the kanuki 17
One end is a reset unit (not shown), and the movement of the clock stops. Further, the minute wheel 5 and the minute gear 5b have a slip structure, and the third wheel 8, the second wheel 7 and the second hand 11 have a very general well-known structure in which they are stopped.

Next, a description will be given of a correction structure for correcting a time difference of only the hour hand. The winding stem 12 is pulled out to the one-step pulling position, and the boss portion 12a of the winding stem 12 and the inner boss portion 13a of the first correction wheel 13 are fitted. By rotating the winding stem 12 in this state, the first correction wheel 13 and the second correction wheel 14 are rotated, and the correction lever 15 held by the second correction wheel 14 is rotated.
Activate The correction lever 15 is provided with a feed claw 15a for rotatingly feeding the toothed portion 6a of the hour wheel 6, and rotates the toothed portion 6a of the hour wheel 6 back and forth by about 30 degrees corresponding to about one hour. Since the hour wheel 6 is constantly rotating and the position of the tooth portion 6a is slightly moving, the rotation feed of exactly 30 ° may not be possible depending on the position of the tooth portion 6a. Although not shown, the correction lever 15 has a tooth portion 16a of the date plate 16.
Is provided so that any of the hour wheel 6 and the date plate 16 can be rotationally fed according to the rotation direction of the winding stem 12.

The case in which the hour wheel 6 is rotated in this state and the time difference is corrected will be described in detail. Now, the number of teeth of the minute wheel 5 is 13
The number of teeth of the Hino reverse gear 1 is 26, the number of Hino reverse kana 2 is 6, and the hour wheel 6 meshing with the Hino reverse kana 2 is 36. As a result, the reduction ratio between the minute wheel 5 and the hour wheel 6 is
13/26 × 6/36 = 1/12, which is a general Hino back reduction gear train configuration. The hour of the hour wheel 6 is 30 °, and the angle of the Hino back kana 2 is equivalent to 30 ° × 36/6 = 180 °.

The coupling force between the Hino reverse pinion 2 and the Hino reverse gear 1 will be described with reference to FIG. The coupling magnet 4 fixed to the Hino back kana 2 is magnetized in two poles at 180 ° pairs in the radial direction. The coupling stator 3 fixed to the Hino reverse gear 1 has an inner diameter composed of eccentric circles mutually, and the coupling force between the Hino reverse pinion 2 and the Hino reverse gear 1 has a maximum of two locations in one round. And the coupling force is always applied to the stable coupling position at every 180 °. As described above, when the hour wheel 6 is rotated about 30 degrees by the correction lever 15 at an angle of about 1 hour, the Hino back kana 2 is rotated about 180 degrees. Here, Hino back kana 2 and Hino back gear 1
Is a triangular function curve that maximizes two places in one round, and the Hino back kana 2 is always 180 ° opposite to the Hino back gear 2 meshing with the minute wheel 5 It is bound to a stable binding position. Thus, the rotation feed amount of the hour wheel 6 is 30
In the extreme case, if the angle is in the range of 15 ° to 45 °, all the hands are connected to the opposite stable connection position, and the hour hand 11 can be corrected by just one hour.

Next, the magnitude of the aforementioned coupling force will be described. If the coupling force is larger than the motor torque of the timepiece, the Hino reverse gear 1 is configured with a speed increasing gear train from the minute wheel 5, the third wheel 8, the second wheel 7 to the rotor (not shown) of the motor. When the hour wheel 6 is forcibly rotated, the rotor of the motor is stopped or forcedly rotated and the time is changed. Conversely, when the coupling force is small and smaller than the single weight force of the hour hand 9, the hour wheel 6,
Hino back kana 2 rotates and the time difference is corrected without permission.

In the case of a normal electronic timepiece, the torque of the motor is 1.5 to 2.0 gcm at the minute indicator 5, and
Is 1.5 × 26/13 = 3 gcm or less.
In the case of the minute hand 10 having a normal size, the minute wheel 5 and the minute gear 5 are used.
If the slip torque of b is set to about 3 gcm, the minute hand 10 will not jump out of the minute hand 10 in ordinary carrying. Generally, hour hand piece weight / minute hand piece weight = 3 / 4th place, and 3 × 3/4 × 1/6 (Hino back kana 2, hour wheel 6 reduction ratio) = 0.375 gcm for Hino reverse gear 1 It is necessary. As described above, if the magnitude of the coupling force is set to about 0.5 gcm, even if the hour wheel 6 is forcibly rotated to correct the time difference, it is possible to correct only the hour hand 5 by one hour without stopping the clock. is there.

FIG. 3 is a plan view of a main part of another embodiment of the present invention. In the case of FIG. 2, the aforementioned coupling force is determined by the magnitude of the magnetic force of the coupling magnet 4, the magnetic permeability of the coupling stator 3, the eccentricity of the eccentric circle of the inner diameter, the gap amount between the coupling magnet 4 and the coupling stator 3, and the like. , Can be easily set in consideration of the material and size of the coupling stator 3 and the coupling magnet 4. FIG. 3 shows a magnetic coupling portion between the Hino reverse gear 1 and the Hino reverse pinion 2, and the coupling stator 3
Is formed from an eccentric circle into a shape in which two projections are formed at 180 ° intervals. In this case, the magnetic coupling force can be increased by reducing the gap between the projection and the coupling magnet 4.

[0019]

According to the present invention as described above, according to the invention], an hour wheel for holding a minute wheel, when the needle for holding the minute hand, the tubular rotation of the winding stem
A transmission wheel for transmitting the power to the vehicle;
Reach pinion and rotates freely configured to each other, by and bound by a magnetic force in the radial direction with respect to the rotation axis, the rotation of the winding stem
In summary 30 ° rotary feed modifying member a hour wheel by correction wheel tell, without stopping the second hand and minute hand, just 1 hour by one hour it is possible to correct accurately.

Further, since the transmission gear and the transmission pin are mutually coupled by a magnetic force in the radial direction with respect to the rotation shaft, the transmission gear and the transmission pin are composed of one magnet and a stator which can be easily punched out. The time difference correction mechanism can be realized with a low-priced configuration with a small number of points. In addition, because the modified vehicle has a coupling part,
As compared with a time difference correction timepiece in which a connecting member is formed on an hour wheel like a conventional mechanism, the thickness of the central portion can be made thinner, and a great effect such as a thinner timepiece can be achieved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a wheel train structure of a timepiece movement showing an embodiment of the present invention.

FIG. 2 is a plan view of a main part showing the magnetic coupling of the Hino reverse gear and the Hino reverse kana showing the embodiment of the present invention.

FIG. 3 is a plan view of a main part of the magnetic coupling of the Hino reverse gear and the Hino reverse kana showing another embodiment of the present invention.

[Explanation of symbols] 1 day reverse gear 2 day reverse gear 3 coupling stator 4, coupling magnet 5 minute wheel 6 hour wheel 7 second wheel 8 3rd wheel 9 hour hand 10 minute hand 11 second hand 12 Makizuma 13 First modified car 14 Second modified car 15 Correction lever 16 Date plate 18 Tsumi car 19 Small iron car

Continuing on the front page (72) Inventor Norihisa Suzuki 6-11-12 Honcho, Tanashi-shi, Tokyo Citizen Watch Co., Ltd. Tanashi Factory (72) Inventor Zeno Shinfun 6-1-1, Honcho, Tanashi-shi, Tokyo No. Citizen Watch Co., Ltd. Examiner at Tanashi Works Tokio Goto (56) References JP-A-3-255980 (JP, A) JP-A-49-102382 (JP, A) JP-A 1-206286 (JP, A) Japanese Utility Model Hei 4-38587 (JP, U) Japanese Utility Model Utility Model 55-122182 (JP, U) Japanese Utility Model Utility Model 55-154489 (JP, U) Japanese Utility Model Utility Model 1-121890 (JP, U) Japanese Patent Publication 48 -36911 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) G04B 19/22 G04B 19/23 G04B 27/00 G04C 9/00

Claims (1)

(57) [Scope of request for utility model registration] 1. A fraction having a pinion minute wheel that holds the minute hand, when the hour wheel which holds the needle, stem, linked to the winding true rotary clutch
Car, transmission for transmitting the rotation of the thumbwheel to the hour wheel
In a hand -held timepiece having a car,
A transmission gear formed of a transmission gear and a transmission pinion;
And the transmission pinion are configured to rotate freely with each other, and are coupled to each other by a magnetic force in the radial direction with respect to the rotation axis.
A correction wheel that engages with the winding wheel, and the rotation of the correction wheel
A time difference correcting mechanism for a timepiece display type timepiece, wherein a correcting member for transmitting the time difference is provided .