JPH08160164A - Home Position Detection Device for Analog Clock Movement - Google Patents

Abstract

(57) [Abstract] [Purpose] The whole structure of the analog timepiece movement can be simplified and manufactured at low cost.
The amount of movement of the home position detecting small hole per minute feed is increased, and it is possible to quickly escape from the sensor to improve the resolution. [Structure] A small hole 6S for home position detection is provided in a disc body 6 continuously provided on the outer circumference of the minute hand feed gear 5, and a planetary gear 8 mounted on a mounting shaft 7 standing on the upper surface of the minute hand feed gear 5 Similarly, a small hole 8S for home position detection is provided, and the position where the small holes 6S and 8S intersect is detected by the sensor 1
3 detects as home position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an analog timepiece movement, and more particularly to a home position detecting device suitable for use in an analog timepiece movement.

[0002]

2. Description of the Related Art For example, in an electronic time recorder,
When the analog clock is automatically adjusted after initial settings or after a power failure, a signal for time adjustment is issued at 0:00 of the analog display time, which is used as the reference for time adjustment. The signal is, for example, actual Kaihei 2-124593
It was obtained by using the home position detecting device having the configuration as shown in FIG. 4 of the publication and FIG. 7 of the present application.

That is, FIG. 7 is a plan view of the above-mentioned conventional apparatus, in which A is a gear for driving a long hand which is rotated by a gear F of a motor (not shown) and B is a short hand. The drive gear, C is a drive gear integrally formed with the long hand drive gear A, D is an interlocking gear that meshes with the drive gear C and is interlocked and rotated, E is integrally formed with the interlocking gear D, and It is a drive pinion that meshes with the short hand driving gear B and rotates in conjunction therewith, and G and H are the small holes (slits) provided in the respective long hand driving and short hand driving gears A and B. When the small holes G and H of both of them are completely coincident with each other, the light transmission type sensor S detects the home position, while the home position is not on the center of the sensor S, or when the home position is too far. The motor drives the long hand drive gear A It has a mechanism to fix interest.

[0004]

However, the conventional home position detecting device constructed as described above uses a large number of gears and pinions, and therefore the structure becomes complicated and the size and cost increase. In addition, the clock feed is generally one minute feed, and the two eyelets G and H must not be overlapped for one minute before and after the standard time when these eyelets G and H overlap, so clear this. In order to achieve this, a very high processing accuracy is required, and the manufacturing cost is further increased, or the amount of movement of the small hole H of the short needle driving gear C per minute feed is very small at 0.5 °, and the sensor S Since the small hole H does not easily escape, there is a problem that the resolution is poor and the accuracy and stability are lacking.

Therefore, a technical problem of the present invention is that the entire structure can be easily manufactured, and at a low cost, and the amount of movement of the home position detecting eyelet per minute feed is increased, It is to improve the resolution.

[0006]

[Means for Solving the Problems] Means taken in the present invention for solving the above technical problems are as follows.

A stepping motor is provided with a mounting shaft projecting from the surface of a minute hand feed gear that rotates once per hour. A planetary gear is mounted on this mounting shaft, and the planetary gear has a tooth ratio of 12:11. In the analog timepiece movement configured so as to mesh with both the hour hand feed gear and the sun gear and make one rotation of the minute hand feed gear, the hour hand feed gear rotates 1/12 according to the number of teeth of each gear. And

(1) A small hole is formed in each surface of the minute hand feed gear and the planetary gear, and a sensor for detecting light passing through when the small holes of these gears are overlapped is provided. Configure to obtain a reference signal for clock adjustment by detecting light.

(2) A disc body is continuously provided on the outer circumference of the minute hand feed gear, and a small hole of the minute hand feed gear which overlaps the small hole of the planet gear and transmits the light of the sensor is bored in this disc body portion. thing.

(3) By rotating the stepping motor in the horizontal direction, the flanges projecting on the left and right sides of the stepping motor are fitted into the bottom surface of the gear box containing the hand-moving gear mechanism including the minute hand feed gear, and stepping is performed. The left and right locking blocks are installed to attach the motor to the position where the pinion meshes with the minute hand feed gear, and the flange fitted in this locking block is locked at the entrance of either one of these locking blocks. A stopper is provided, and the stopper can be freely pushed into the box against the elasticity.

[0011]

Each of the means described in (1), (2) and (3) above operates as follows.

The long hand drive gear A of the above conventional apparatus rotates 6 ° per minute, and the short hand drive gear B rotates 6 ° × 1 / min.
In contrast to the rotation of 12 = 0.5 °, according to the means described in (1) above, the minute hand feed gear on which the planetary gear is mounted is 6
When rotated by ° (1 minute), the planet gear on this gear has 1 tooth.
Since the number of teeth of the sun gear is 11 or 22 with 2 or 24, 6 ° × 11/12 or 6 ° × 2 from the meshing of these
2/24 = 5.5 ° rotation, and since this 5.5 ° rotation is centered on the mounting axis of the minute hand feed gear that rotates 6 °, conventionally, the rotation speed of 0. The small hole of the needle feed gear that can escape only 5 ° can be largely and quickly released from the sensor, so that resolution can be improved and accuracy and stability can be improved, and the number of gears (pinions) used is small. It is possible to reduce the size and cost by simplifying the configuration of the entire device.

According to the means described in the above (2), the small hole of the minute hand feed gear is bored not in the surface of the minute hand feed gear but in the disc body continuously provided on the outer periphery thereof, so that the minute hand feed gear can be moved more than the central axis. Since the small hole is provided at the farthest position, the amount of movement of the small hole when the minute hand feed gear is fed by 1 minute can be made larger than that in which the minute hand feed gear itself is provided with the small hole. Since the amount of movement of the planetary gears mounted on the feed gear can be made large, these small holes can be quickly and largely missed from the sensor to improve the resolution and accuracy.

According to the means described in the above (3), when the entire stepping motor is horizontally rotated while the stopper is pressed by one flange, the left and right flanges are formed on the bottom surface of the gear box. The stepping motor can be installed in the locking block so that the pinion meshes with the minute hand feed gear, and when the flange is inserted in the locking block, the stopper re-projects due to elasticity and the flange Since it is locked in the fitted state, it is possible to mount the stepping motor on the gear box side surely with one touch just like a twist lock.

As described above, the above-mentioned technical problems can be solved by the above-mentioned means, and the problems of the conventional art can be solved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the home position detecting device in the above-described analog timepiece movement according to the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view for explaining the internal structure of an analog timepiece movement equipped with a home position detecting device according to the present invention. In the figure, 1 is a dial (back plate) of an analog timepiece, and 2 is a dial. The gear box 3 attached to the back side of the dial 1 is a stepping motor attached to the bottom surface of the gear box 2 by a one-touch attachment means described later.
Is a minute hand rotating shaft which is inserted through the center of the gear box 2 and whose tip is projected to the front surface of the dial 1. The attaching part 11a of the minute hand 11 is attached to the tip of this rotating shaft 4, and the rotating shaft The gear part 5a of the minute hand feed gear 5 fixed to the intermediate part of 4
However, the pinion 3a of the stepping motor 3 is engaged with the pinion 3a, and when the stepping motor 3 rotates, the minute hand 11 is fed by a minute.

Reference numeral 7 denotes a mounting shaft which is erected on the outer upper surface of the minute hand feed gear 5. A planetary gear 8 having a total of 12 or 24 teeth 8a is rotatably mounted on the mounting shaft 7.
The planetary gear 8 has a cylindrical shaft portion 10b integrally formed.
The teeth 10a of the hour hand feed gear 10 rotatably fitted to the long hand rotation shaft 4 and the teeth of the cylindrical sun gear 9 connected to the back plate of the dial 1 so as to surround the minute hand rotation shaft 4. It meshes with both 9a.

The hour hand feed gear 10 has 12 or 24 teeth 10a, and the sun gear 9 has 9 teeth 9a.
If the minute hand feed gear 5 makes one revolution due to the difference in the number of teeth, the hour hand feed gear 10 becomes 1/12.
When the minute hand feed gear 5 rotates 12 times by rotation, the hour hand feed gear 10 makes one rotation, and the planet gears 8 return to the same position and the same phase at exactly 0:00 and 12:00.

Reference numeral 12 is an hour hand, and 12a is a connecting portion for attaching the hour hand 12 to the tubular shaft portion 10b of the hour hand feed gear 10 and 1a is a head portion of a shaft tubular portion 8T formed on the planetary gear 8, A guide for preventing the planetary gear 8 from coming off the mounting shaft 7 is shown.

Next, in FIGS. 1 and 3, reference numeral 6 denotes a disk body continuously provided on the outer circumference of the minute hand feed gear 5 described above, and 6S and 8S have hour hands of exactly 0:00 and 12:00. At the same time, the disc body 6 and the planetary gear 8 have small holes formed in the surfaces thereof so that their centers coincide with each other.
A light transmissive sensor 13a for transmitting light to S and 8S and detecting this position as a home position.
2 shows a hook for fixing the inside of the gear box 2 to the inside of the side.

FIG. 2 is a bottom view of the gear box 2 to which the stepping motor 3 is attached, FIG. 5 is a bottom view of the gear box 2 showing a state in which the stepping motor 3 is also attached, and FIG. 6 is a Z of FIG. -Z is a cross-sectional view taken along the line Z, and in these drawings, reference numerals 2b and 2c are left and right locking blocks which are opened at one side of the bottom of the gear box 2 with the fitting openings facing in opposite directions. 3b and 3c are flanges projecting to the left and right sides of the stepping motor 3 described above. When the stepping motor 3 is rotated in the counterclockwise direction from the state of FIG. 5, the left and right flanges 3b and 3c are rotated.
c is fitted inside the left and right locking blocks 2b and 2c as shown in FIG. 2, the stepping motor 3 is attached to the bottom surface of the gear box 2, and the pinion 3a is attached to the minute hand feed gear 5 as shown in FIG. It is configured to be attached to the gear portion 5a in a state of being meshed with the gear portion 5a.

Also in the above drawings, 2a is a stopper projectingly formed on the bottom surface of the gear box 2 so as to close the entrance portion of the one locking block 2b, and 2H is a notch groove formed so as to surround the stopper 2a. When the stepping motor 3 is attached to the gear box 2, the stopper 2a is pushed by one flange 3b and is elastically pushed up in the direction of the arrow shown in FIG. Allows fitting, but once flange 3
When "b" is fitted into the locking block 2b, it is projected by elastic force to the return position shown in FIG. 6 and presses the side edge of the flange 3b fitted into the locking block 2b as shown in FIG. ,
The stepping motor 3 is structured so as to hold it so as not to come off from the gear box 2.

Since the home position detecting device in the analog timepiece movement according to the present invention has the structure as described above, the stepping motor 3 is mounted on the bottom surface of the gear box 2 just like a twist lock, and then the stepping motor is energized. When the minute hand feed gear 5 is rotated by the rotation of 3, the minute hand 11 is fed by 6 ° per minute, and when the minute hand feed gear 5 makes one revolution in this way, the planet gear 8 rotates the hour hand feed gear 10 by 1/12. , Move the hour hand 12 for 1 hour (30 °).

When the minute hand 11 and the hour hand 12 are moved to 0:00 or 12:00 in this way, as shown in FIG. 3, the small hole 6S and the planetary gear 8 provided in the disc body 6 of the minute hand feed gear 5 are shown.
The small hole 8S provided at the position is completely matched, and the sensor 13 detects this as the home position.
When the home position is not on the center line of the sensor 13 even at 2:00, that is, both the small holes 6S and 8S.
If 0 is not completely crossed, the control unit CPU performs a fast-forward operation of the stepping motor 3 before 0:01 or 12:01 to make a correction to completely cross both small holes 6S and 8S.

When one minute has passed after the home position was detected by the sensor 13, the minute hand feed gear 5 rotates 6 °, and the planet gear 8 rotates on the minute hand feed gear 5 which rotates 6 ° as shown in FIG. 6 ° x 11/12 centered on the mounting shaft 7
Alternatively, since 6 ° × 22/24 = 5.5 ° is rotated, the small holes 6S and 8S can be quickly and largely missed with respect to the sensor 13, and the resolution can be improved.

Further, in the present invention, the small hole 6S provided in the minute hand feed gear 5 is located not at the upper surface of the gear but at the position of the disk body 6 which is continuously provided on the outer periphery of the gear 5, that is, away from the central minute hand rotation shaft 4. Since the small holes 6S are provided at the positions, the distance that the small holes 6S move for one minute is made larger, so that the small holes 6S and 8S can be released from the sensor 13 faster and larger, and the resolution can be improved. There is.

Incidentally, 8X in FIG. 4 shows a locus along which the mounting shaft 7 of the planetary gear 8 on the minute hand feed gear 5 moves.

[0029]

As described above, according to the home position detecting device in the analog timepiece movement according to the present invention, the small hole for home position detection is provided in the minute hand feed gear and the planetary gear, and after the home position is detected. Since each small hole is made to escape from the sensor quickly, and also largely, the resolution is good and the sensor does not erroneously detect the small hole, and it is possible to provide a highly accurate detection device. Combined with the fact that the installation can be done easily and reliably with a twist lock, and the overall structure of the device is relatively simple and can be manufactured at low cost, for example, analog clocks for time recorders, etc. It is suitable for the implementation.

[Brief description of drawings]

FIG. 1 is a front sectional view of an analog timepiece movement including a home position detecting device according to the present invention.

FIG. 2 is a bottom view of the analog timepiece movement shown in FIG.

FIG. 3 is a configuration diagram of a state where two small holes match and a sensor detects a home position.

FIG. 4 is a configuration diagram illustrating a moving state of a small hole provided in a planetary gear.

FIG. 5 is a bottom view illustrating a state in which a stepping motor is attached to the gear box.

6 is a cross-sectional view taken along the line ZZ of FIG.

FIG. 7 is a plan view illustrating the configuration of a conventional device.

[Explanation of symbols]

 2 Gear Box 2a Stopper 2b, 2c Locking Block 3 Stepping Motor 3a Pinion 3b, 3c Flange 4 Minute Hand Rotation Shaft 5 Minute Hand Feed Gear 6 Disc 6S Small Hole 7 Mounting Axis 8 Planetary Gear 8S Small Hole 9 Sun Gear 10 Hour Hand Feed Gear 11 Minute hand 12 Hour hand 13 Sensor

Claims (3)

[Claims] 1. A stepping motor causes an hourly movement.
A mounting shaft is provided so as to project from the surface of the rotating minute hand feed gear, and a planetary gear is attached to this mounting shaft. The planetary gear has a tooth ratio of 12:11. In the analog timepiece movement in which the hour hand feed gear rotates 1/12 according to the number of teeth of each of the above gears when the minute hand feed gear makes one revolution, the minute hand feed gear and the planetary gear are engaged. Make small holes on each side of
In addition, an analog timepiece movement characterized in that a sensor for detecting light passing therethrough when the small holes of both gears are overlapped with each other is provided, and a reference signal for clock adjustment is obtained by detection of light by this sensor Home position detection device. 2. A discoid body is continuously provided on the outer circumference of the minute hand feed gear, and a small hole of the minute hand feed gear which is overlapped with the small hole of the planet gear and transmits the light of the sensor is bored in the disc body part. The home position detecting device in the analog timepiece movement according to claim 1. 3. A stepping motor in which a flange provided on both left and right sides of the stepping motor is fitted to the bottom surface of a gear box containing a hand-moving gear mechanism including a minute hand feed gear by horizontally rotating the stepping motor. The left and right locking blocks that attach the pinion to the minute hand feed gear are provided, and the flange that is fitted into this locking block is locked at the entrance of either one of these locking blocks. 2. The home position detecting device for an analog timepiece movement according to claim 1, wherein a stopper is provided and the stopper can be pushed into the box against elasticity.