JP2001318173A - Movement for clock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size of a movement for clock by securing the strength and characteristics of a driving motor. SOLUTION: This movement for clock is provided with the driving motor having rotor housing spaces 311i and 311f in a stator 11, and a bearing 336 for a fifth wheel and pinion which journals the fifth wheel and pinion interlocked with the rotor. A notch 311d for relieving the bearing 336 is provided on the side face of the outer periphery of the stator 311 adjacently to the spaces 311i and 311f, and the bearing 336 is faced to the notch 311d.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive motor having a rotor and a stator, and a gear bearing for supporting a transmission gear interlocked with the rotor. The watch movement provided.

[0002]

2. Description of the Related Art Generally, a timepiece movement for driving a timepiece hand has a driving motor consisting of a rotor and a stator, a transmission gear directly connected to the driving motor and transmitting this driving force to the hands, and a transmission gear. A gear bearing that supports the gear is provided. The transmission gear is a gear interposed between the motor and a pointer wheel such as a second hand wheel, and the pointer wheel rotates at a predetermined speed as the driving motor rotates. As shown in FIG. 9, the driving motor is usually a stator 3 having a U-shape.
11, a bobbin 311a around which a coil fixed to the arm of the stator is wound, and a rotor (not shown) for applying a driving force to the transmission gear. The stator 311, the rotor, and the transmission gear are attached to a middle plate 330 housed inside the movement. The middle plate 330 is provided with a stator mounting portion 330A for mounting the stator 311 and a gear receiving portion 330B having a shaft hole 337 for inserting the second hand wheel and a shaft hole 338 for inserting the third wheel.

[0003] Today, in order to reduce the size of timepieces, it is necessary to reduce the size of the timepiece movement. FIG.
As shown in FIG. 7, on the stator mounting portion 330A, the seventh wheel bearings 334, 6 each supporting a seventh wheel, a sixth wheel, and a fifth wheel as transmission gears for transmitting the driving force of the rotor to the second hand wheel.
Number wheel bearing 335, Number 5 wheel bearing 336 and stator 31
1 are provided with bosses 331 and 332 for positioning. The sixth wheel bearing 33 is provided on the stator 311.
5 relief hole 311e and 5th wheel bearing 336 relief hole 3
11j and fitting holes 311b and 311c for inserting the bosses 311 and 312 to position the stator. When attaching the stator 311 to the stator attachment portion 330A, the bearing 335 for the sixth wheel and the escape hole 311
e, the fifth wheel & pinion bearing 336 is fitted in the relief hole 311j, and the bosses 311 and 312 are fitted in the fitting holes 311b and 311b, respectively.
By fitting into the 311c, the arrangement space of the stator 311, the sixth wheel bearing 335 and the fifth wheel bearing 336 is shared, and the movement can be downsized.

The U-shaped stator 311 includes:
To accommodate a rotor (not shown), storage notches 311f and 311i are formed in the inner periphery of the stator 311 as spaces. By providing the storage notches 311f and 311i while keeping the width of the stator small, the portion adjacent to the storage notch is thin (thin portion 311g, 311g).
311h). By storing the rotor in the storage notches 311e and 311f formed on the inner periphery of the stator 311, a relatively large rotor can be arranged in the stator without increasing the size of the stator.

The pair of storage notches 311f and 311i provided on the stator 311 have different shapes. Thus, characteristics such as the rotation direction and the rotation torque of the rotor are determined.

[0006]

If an escape hole (fitting hole 311j shown in FIG. 9) for a gear bearing is provided in the vicinity of a thin portion of the stator, magnetic flux leaks from the escape hole to rotate the drive motor. Characteristics such as torque may be reduced. The rotation of the rotor serves as a driving force for driving the hands of the timepiece. If the characteristics of the motor fall, the display of the time itself is hindered. In addition, since the clearance hole of the gear bearing is provided in the thin portion, there is a possibility that the stator may be damaged when the clearance hole is formed by punching.

In order to solve the above-mentioned problems, the width of the stator is set to be large and a clearance hole for a gear bearing is provided on the stator at a distance from this space, or the clearance hole is not provided on the stator. Providing a gear bearing on the receiving part has also been performed.

However, if the stator is provided with an escape hole at a certain distance from the storage notch, the size of the stator and the transmission gear increases, and the movement accordingly increases. When a bearing is provided on the gear receiving portion, the size of the transmission gear increases, and accordingly, the movement also increases.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a timepiece movement that can maintain the strength and characteristics of a driving motor and can be downsized.

[0010]

SUMMARY OF THE INVENTION The present invention has a driving motor in which a space for accommodating a rotor is formed in a stator, and a gear bearing for supporting a transmission gear interlocked with the rotor. In a timepiece movement in which a gear bearing is provided, a notch for the gear bearing is provided on the outer peripheral side surface of the stator so as to be adjacent to the space, and the gear bearing faces the notch for the escape.

[0011] Therefore, the distance between the space for accommodating the rotor and the accommodation notch can be set to be larger than in the prior art, so that the strength and characteristics of the drive motor can be maintained. In addition, since the gear bearing is provided in the space where the stator is arranged, the timepiece movement can be reduced in size.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific example of the present invention will be described below with reference to FIGS. As shown in FIG. 1, the watch 1
Hour hand 210, minute hand 220,
And the second hand 230 and these hands 210, 220, 23
And a clock movement 300 for driving the clock 400 when the preset reference time is reached.
Is an alarm clock that generates an audible sound by hitting with a driving bell motor 500. The wake-up sound is stopped by pressing a stop switch 600 provided on the timepiece 1. Further, the power supply for the timepiece movement 300 and the driving bell motor 500 is configured to be obtained from the battery stored in the battery storage section 700 via the circuit board 800.

The watch movement 300 of this embodiment is
As shown in FIGS. 3 and 6, a driving motor 310 including a stator 311 and a rotor 312 having a U-shape is provided.
And a transmission gear train 320 interposed between the drive motor 310 and the second hand wheel 324.

The stator 311 is made of a U-shaped iron core wound with a coil 311a, and the rotor 312 is provided with a magnet for generating a rotational torque.

The transmission gear train 320 is, as shown in FIG.
It is composed of three transmission gears, including a seventh wheel & pinion 321 meshing with the rotor 312, a sixth wheel & pinion 322 meshing with the seventh wheel, and a fifth wheel & pinion 323 meshing with the sixth wheel. The fifth wheel & pinion 323 meshes with the second hand wheel 340, and the three transmission gears rotate the second hand wheel 340 once a minute.

The second hand wheel 340 meshes with the third wheel & pinion 341, and the third wheel & pinion 341 meshes with the minute wheel & pinion 342. Also,
The minute hand wheel 342 meshes with the Hino minute wheel 343, and the Hino minute wheel 3
Reference numeral 43 meshes with the hour wheel 344. As a result, the second hand wheel 34
0 is decelerated, the minute hand wheel 342 is rotated once per hour, and the minute hand wheel 342 is decelerated to rotate the hour hand wheel 344 once every 12 hours.

Bearings are provided on the middle plate 330 and the dust cover 350, respectively, and the shaft of each transmission gear is supported by these bearings. 7th car 321, 6th car 322 and 5th car 3
One shaft of the shaft 23 is supported by a bearing provided on the middle plate 330, and the other shaft is supported by a bearing provided on the dust cover 340.

As shown in FIG. 4, the middle plate 330 is a lower plate 3
It is fixed in a space formed by the dust cover 60 and the dust cover 350. The driving motor 31 is also provided in this space.
0, transmission gear train 320, second hand wheel 340, third wheel 341
The minute hand wheel 342, the minute wheel wheel 343, and the hour hand wheel 344 are fixed, and the drive motor 310 and the transmission gear train 320 are attached to the middle plate 330.

As shown in FIG. 4, the middle plate 330 has a stator mounting portion 330A for mounting the stator 311, a shaft hole 337 for supporting the second hand wheel and a shaft hole 3 for supporting the third wheel.
38, the gear receiving portion 330B and the stator mounting portion 3
A rotor bearing 330 </ b> C is provided near 30 </ b> A and supports the rotor 312.

As shown in FIG.
On A, 7th car 321, 6th car 322, 5th car 323
And bosses 331 and 332 for positioning the 7th and 6th wheel bearings 335 and 336 and the stator 311, respectively. As shown in FIG. 7, the seventh wheel bearing 334, the sixth wheel bearing 3
The 35th and 5th wheel bearings 336 are formed of cylindrical bosses, into which one shaft of the 7th wheel 321, one shaft of the 6th wheel 322 and one shaft of the 5th wheel 323 are inserted, respectively. By doing so, the transmission gear train 320 can be supported on the middle plate 330. The gear receiving portion 330 </ b> B has a second hand wheel through-hole 337 through which the shaft of the second hand wheel 340 is inserted, and a third wheel & pinion through hole 338 for supporting the third wheel & pinion 341. As shown in FIG. 8, the stator mounting portion 330A is not on the same plane as the gear receiving portion 330B, and is located at a position lowered by the thickness T of the stator 311.

As shown in FIG. 7, the rotor bearing 330C
Is formed by a cylindrical boss, and the rotor 312 is supported by fitting the shaft of the rotor 312 into the inside.

On the inner periphery of the U-shaped stator 311, storage notches 311 f and 311 i are formed as spaces for housing the rotor in the stator. Since the storage notches 311f and 311i are provided while keeping the width of the stator 311 small, the portions adjacent to the storage notches are thin and thin portions 311g and 311h are formed. Thereby, a relatively large rotor arrangement space can be secured in a small stator. A pair of storage notches 311f and 311 provided in the stator 311
i have different shapes, which determine characteristics such as the rotation direction and the rotation torque of the rotor.

Further, as shown in FIG.
The relief hole 311e of the sixth wheel bearing 335, the notch 311d of the fifth wheel bearing 336, and the boss 311,
312 are provided with fitting holes 311b and 311c.
The escape notch 311d is provided on the outer peripheral side surface of the stator so as to be adjacent to the storage notch 311i. The escape notch 311d has an arc substantially the same shape as the outer periphery of the fifth wheel & pinion bearing 336.

The stator 311 is attached to the stator mounting portion 330A.
When attaching the 6th wheel bearing 335, the 5th wheel bearing 336, and the bosses 311 and 312, respectively,
e, it can be attached by fitting it into the escape notch 311d and the fitting holes 311b and 311c.

The movement can be downsized by sharing the arrangement space for the fifth wheel bearing 336 and the stator 311. In addition, the distance between the notch for storage and the notch for escape can be maximized, and the characteristics of the drive motor can be maintained.

In this specific example, the stator has a U-shape. However, a stator having a square shape in which a connecting plate is fixed to surround a rotor may be used.

In this specific example, the driving motor is of a continuous rotation type. However, the present invention is not limited to this, and a stepping motor can be used. When a stepping motor is used, the fifth wheel is engaged with the rotor, and the second hand wheel is engaged with the fifth wheel. The bearing of the fifth wheel & pinion may face the escape notch of the stator.

[0028]

According to the present invention, the strength and characteristics of the driving motor can be maintained, and the timepiece movement can be reduced in size.

[Brief description of the drawings]

FIG. 1 is a front view showing a timepiece according to a specific example of the present invention.

FIG. 2 is a view showing a timepiece movement according to a specific example of the present invention.

FIG. 3 is a view showing the inside of a timepiece movement according to a specific example of the present invention.

FIG. 4 is a diagram showing a middle plate according to a specific example of the present invention.

FIG. 5 is a view showing a state where a stator is attached to an intermediate plate according to a specific example of the present invention.

FIG. 6 is a view showing a state in which a stator and a gear bearing are mounted on an intermediate plate according to a specific example of the present invention.

FIG. 7 is a perspective view showing a state where a stator is attached to an intermediate plate according to a specific example of the present invention.

FIG. 8 is a sectional view taken along line AA shown in FIG. 6;

FIG. 9 shows a conventional example, and shows a state in which a stator is attached to an intermediate plate.

[Explanation of symbols]

 300 Timepiece Movement 310 Driving Motor 311 Stator 311d Escape Notch 311f Storage Notch 311i Storage Notch 312 Rotor 320 Transmission Gear Train 323 5th Wheel (Transmission Gear) 340 Second Hand Wheel 330 Middle Plate 330A Stator Mounting Section 336 5 Wheel bearings (gear bearings)

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Shigeru Fukuoka 1-2-1 Kinshi, Sumida-ku, Tokyo Rhythm Watch Industry Co., Ltd. F-term (reference) 2F001 AA01 AF00 AG01 AG05 AG07 AG12 5H607 BB01 BB10 BB14 CC01 CC03 DD01 DD02 DD03 DD17 EE31 EE36 GG00

Claims (1)

[Claims] 1. A driving motor having a space for accommodating a rotor formed in a stator, and a gear bearing for pivotally supporting a transmission gear interlocking with the rotor, wherein the gear bearing is provided in a space in which the stator is arranged. In the timepiece movement provided, a notch for relief of the gear bearing is provided on the outer peripheral side surface of the stator so as to be adjacent to the space, and the gear bearing faces the relief notch. Movement.