JP2971359B2 - Clock gear structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear structure of a hand drive system of a timepiece, and more particularly to a gear structure of a hand drive system of a hand which is driven at a low torque.

[0002]

2. Description of the Related Art FIG. 4 is a diagram showing the configuration of a low torque pointer driving system of a conventional analog timepiece. In FIG.
The second hand drive system 30 that drives the second hand with a low torque includes a stepping motor 31, a fifth wheel & pinion 32, and a second hand wheel 33. Stator 31a of stepping motor 31
Is mounted on the lower plate 11 of the timepiece, and the rotor 31b is mounted on the lower plate 1
The stepping motor 31 is pivotally supported by the first plate 1 and the upper plate 13, and the rotation direction, the rotation angle, and the rotation angle of the stepping motor 31 are controlled by a control system (not shown).

The fifth wheel & pinion 32 is supported by the lower plate 11 and the upper plate 13.
The rotation speed of the rotor 31b is reduced to a predetermined speed by the fifth wheel & pinion 32, being meshed with the rotor 31b of the stepping motor 31. As shown in FIGS. 4 and 5, a substantially cylindrical shaft support portion 32 b protrudes from the fifth wheel & pinion 32 beyond the position of the ring tooth 32 a at the shaft support portion between the fifth wheel & pinion 32 and the upper plate 13. An engagement hole 13c is formed at an axial position of an engagement shaft 13a formed integrally with the upper plate 13.
Is formed, and the shaft support 32b is engaged with the engagement hole 13c.

One end of the shaft of the second hand wheel 33 is connected to the upper plate 13.
, The other end penetrates the middle plate to the lower plate 11 side, and the second hand shaft 33a is connected to the other end. The second hand shaft 33a penetrates through the lower plate 11 and is inserted into a through hole 241a of a minute hand pipe 241 protruding to the surface side on which a timepiece dial and the like are formed, and a second hand (not shown) is attached to the tip thereof. ing. The ring tooth portion of the second hand wheel 33 is meshed with the pinion portion of the fifth wheel & pinion 32, and makes one rotation per 60 seconds.

As shown in FIG. 6, an engaging hole 32c is formed in a shaft supporting portion 32b protruding from the fifth wheel & pinion 32 in the shaft supporting structure between the upper plate 13 and the fifth wheel & pinion 32. In some cases, an engagement shaft 13a formed integrally with the upper plate 13 is engaged with the engagement hole 32c.

[0006]

In the above-mentioned conventional pointer driving system, the fifth wheel & pinion 32 in both cases of FIGS.
The tip of the shaft support portion 32 b formed so as to protrude beyond the position of the wheel teeth 32 a of the fifth wheel & pinion 32. This fifth
After assembly, the wheel 32 has a tooth 32a meshed with the rotor 31b of the stepping motor 31, and a lower end portion of the lower plate 11
Therefore, the portion below the ring teeth 32a, that is, the portion that does not project from the plane S1 shown in FIGS. 5 and 6, is stably arranged in the timepiece body 10.

However, in the structure shown in FIG. 5, during storage or transportation of the assembled watch, for some reason,
When an external force is applied to the watch main body 10, a force for displacing the engagement shaft 13a via the upper plate 13 may be applied. When such a force is generated on the engagement shaft 13a, The protruding portion of the shaft support portion 32b above the ring teeth 32a, that is, the protruding portion from the plane S1 may be bent or damaged by this force. 5th car 3
When storing or transporting the parts that handle 2 as a single part, and even during assembly work, the shaft support part 32b
Protruding beyond the position of the ring teeth 32a is not desirable because accidents such as collision with other parts easily occur.

In the structure shown in FIG. 6, when an external force is applied to the timepiece body 10 for some reason during storage or transportation of the assembled timepiece, the engagement shaft is connected via the upper plate 13. A force for displacing the shaft 13a may be applied. When such a force is generated on the engagement shaft 13a, the protrusion of the shaft support portion 32b above the ring teeth 32a, that is, the protrusion from the plane S1 causes the protrusion. , The engagement shaft 13a
May be bent or damaged. Also, in this case, the bearing 32b protrudes beyond the position of the ring teeth 32a when storing or transporting the fifth wheel & pinion 32 as a single part, and also during assembly. Accidents such as collision with parts easily occur, which is not desirable.

For this reason, conventionally, in the structure shown in FIG. 5, the shaft supporting portion 32b protrudingly formed on the fifth wheel & pinion 32 is formed with a sufficiently large diameter for safety, and is shown in FIG. In the structure, the engagement shaft 13a formed integrally with the upper plate 13
Was formed with a sufficiently large diameter for safety.

As described above, in the shaft supporting structure of the upper plate 13 and the fifth wheel & pinion 32, the shaft supporting portion 3 protrudingly formed on the fifth wheel & pinion 32.
2b or the engaging shaft 1 formed integrally with the upper plate 13
If the diameter of 3a is formed to be large, the torque loss at the fifth wheel & pinion 32 becomes large, and it becomes necessary to increase the torque of the stepping motor 31, which hinders downsizing of the pointer driving system. At the same time, noise during operation also increases. Further, as described above, even when the fifth wheel & pinion 32 is handled as a single component, if the shaft support portion 32b protruding from the fifth wheel & pinion 32 has a protruding portion from the plane S1 shown in FIGS. In addition, the chance of causing an accident due to interference with other members during storage or assembly increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent damage to a shaft supporting portion of a drive system due to external force and torque loss during driving after assembly. It is an object of the present invention to provide a gear structure of a timepiece that can reduce noise at the time of manufacture and can be easily handled as a single component during storage and assembly.

[0012]

In order to achieve the above object, the present invention provides a gear rotatably supported on a timepiece base plate, a gear meshed with the gear and a rotatable shaft mounted on the timepiece base plate. A timepiece wheel driving mechanism for transmitting a predetermined torque from the gear wheel to the wheel wheel, wherein the handwheel is supported by a wheel and a fixed portion of the timepiece. The structure is configured such that the tip of the protruding portion from the gear supported by the fixed portion does not protrude beyond the meshing portion of the gear.

[0013]

According to the driving system of the pointer of the present invention, a driving motor,
For example, a torque from a stepping motor is rotatably supported on a main plate of a timepiece and transmitted to gears meshing with the stepping motor. Next, the wheel is rotatably supported by the main plate of the timepiece and transmitted to the wheel engaged with the gear, whereby the low-torque pointer is driven by the wheel. In this case, in the shaft support portion, the tip of the protruding portion from the gear supported by the ground plate is configured not to protrude beyond the meshing portion of the gear with the stepping motor, and is stored during assembly and during transportation. Even if external force is applied to the timepiece or external force is applied at the time of assembly, the protrusions are not damaged at the shaft support, noise during operation is reduced, and parts management of the gear alone becomes easy. .

[0014]

1 to 3 show an embodiment of the present invention.
This will be described with reference to FIG. FIG. 1 is a sectional view showing the configuration of a hand drive system of an analog timepiece to which an embodiment of the present invention is applied, FIG. 2 is a diagram showing the configuration of a main part of the embodiment, and FIG. It is sectional drawing which shows a structure.

In FIG. 1, a timepiece body 10 includes a lower plate 1.
An intermediate plate 12 is provided at a substantially central position of a space formed by the first plate 1 and the upper plate 13, and the lower plate 11, the intermediate plate 12
And the second hand drive system 30
A, minute hand drive system 20, hour hand wheel 40, minute wheel 50 and manual correction shaft 60 are fixed or supported.

The second hand drive system 30A comprises a stepping motor 31, a fifth wheel 32A and a second hand wheel 33. 4, the stator 31a of the stepping motor 31 is mounted on the lower plate 11 of the timepiece, and the rotor 31b is pivotally supported by the lower plate 11 and the upper plate 13. As shown in FIG. The rotation direction, rotation angle, and rotation speed of the motor 31 are controlled by a control system (not shown).

The fifth wheel & pinion 32A includes a lower plate 11 and an upper plate 13
The wheel teeth 32a of the fifth wheel & pinion 32A are meshed with the rotor 31b of the stepping motor 31, and the rotation speed of the rotor 31b is reduced to a predetermined speed by the fifth wheel & pinion 32A. . Axle support 3 of 5th wheel 32A
2b, as shown in FIG. 2, is formed in a substantially cylindrical shape so as to protrude to the same position as the ring teeth 32a. And ground plate 1
The shaft support portion 32b is engaged with an engagement hole 13c formed at a shaft center position of the engagement shaft 13a provided at a predetermined position of No. 3.

Similarly to the conventional pointer driving system, one end of the shaft portion of the second hand wheel 33 is supported by the upper plate 13 and the other end thereof penetrates the middle plate 12 to the lower plate 11. Second hand axis 3 at the end
3a is coupled. The second hand shaft 33a is attached to the lower plate 11
Is inserted through the through hole 241a of the minute hand pipe 241 protruding to the surface side on which the timepiece dial and the like are formed,
A second hand (not shown) is attached to the tip. The ring tooth portion of the second hand wheel 33 is meshed with the pinion portion of the fifth wheel & pinion 32, and makes one rotation per 60 seconds.

The minute hand drive system 20 includes a stepping motor 2
It is constituted by a first and fifth wheel 22, a third wheel 23 and a minute hand wheel 24. Stator 21 of stepping motor 21
a is mounted on the lower plate 11, and the rotor 21 b is mounted on the lower plate 11
The rotation direction, rotation angle and rotation speed of the stepping motor 21 are controlled by a control system (not shown). The fifth wheel 22 includes the lower plate 11 and the upper plate 1
3, the wheel teeth are meshed with the rotor 21b of the stepping motor 21, and the fifth wheel & pinion 22 rotates the rotor 2b.
1b is reduced to a predetermined speed. The third wheel & pinion 23 has one end of the pinion pivotally supported by the upper plate 13, and the other end thereof is disposed so as to pass through the middle plate 12, and the wheel teeth portion meshes with the pinion portion of the fifth wheel & pinion 22. Have been.

As shown in FIG. 3, the minute hand wheel 24 has a substantially T-shaped minute hand pipe 241 having a through hole 241a formed in the center thereof, and a disc-shaped minute hand pipe 241 on one end side peripheral edge. The minute hand receiving portion 242 is formed in the center of the minute hand receiving portion 242 and a through hole 243a is formed in the center portion.
And a minute hand gear 243 mounted on the upper surface 242a of the main body. In the state where the minute hand gear 243 is placed on the upper surface 242a of the minute hand receiving portion 242, one end of the minute hand pipe 241 is pivotally supported by the through-hole 121 of the middle plate 12, and The end side is inserted through a shaft portion of an hour wheel 40 that penetrates through the lower plate 11 and protrudes to a surface side on which a timepiece dial and the like are formed, and has a minute hand (not shown) attached to a tip end thereof. . The minute hand 24 is
The minute hand pipe 24 is configured to rotate.
The second hand shaft is inserted through the first through hole 241a, and its ring tooth portion is meshed with the pinion portion of the third wheel & pinion 23.

The hour wheel 40 has a substantially T-shape with a through-hole 40a formed in the center, and its ring tooth portion has a body 10
The hour hand pipe 401 penetrates through the lower plate 11 and protrudes toward the dial of the timepiece. An hour hand (not shown) is attached to a tip of the hour hand pipe 401. The hour hand wheel 40 is configured to rotate 30 degrees in one hour and one rotation in 12 hours, and a minute hand pipe 401 is inserted through the through hole 40a.

The minute wheel 50 is rotatably supported by a projection 11a formed on the lower plate 11, and has a wheel tooth portion of which is a minute hand wheel 2.
4 is engaged with the minute hand pipe 241, and
The rotation speed of the minute hand wheel 24 is reduced to a predetermined speed and transmitted to the hour hand wheel 40. In addition, the minute wheel 50 is configured to make one revolution in N (N is a positive integer) time, and its ring tooth portion is
It is arranged so as to mesh with the correction pinion 60a of the manual correction 60.

The manual correction shaft 60 is substantially T-shaped,
The correction pin 60a at the tip is pivotally supported by a projection 11b formed on the lower plate 11 while penetrating through an opening 13b formed on the upper plate 13.
From the watch body 10.
The manual correction shaft 60 is in phase with the minute hand wheel 24, and
When the minute hand wheel 24 is driven by the minute hand drive system 20, when the minute hand wheel 24 is driven by the minute hand drive system 20, as shown in FIG. When the minute hand drive system 20 is not operated, the head 60b rotates in the same phase as the minute hand wheel 24 via the wheel 50.
The position of the pointer can be manually corrected by rotating.

Next, the operation of the above configuration will be described. Second hand drive system 30A that receives an operation instruction from a control system (not shown)
The stepping motor 31 rotates at a predetermined speed. The rotation speed of the rotor 31b of the stepping motor 31 is 5
The speed is reduced to a predetermined speed by the second wheel 32A and transmitted to the second hand wheel 33.

Similarly, the stepping motor 21 of the minute hand drive system 20 that has received an operation instruction from a control system (not shown) rotates at a predetermined speed. Rotor 21 of stepping motor 21
The rotation speed b is reduced to a predetermined speed by the first fifth wheel & pinion 22, further reduced by the third wheel & pinion 23, and transmitted to the minute hand gear 243 of the minute hand wheel.

The rotation of the minute hand wheel 24 is controlled by rotating the minute hand pipe 24.
1 is transmitted to the minute wheel 50, and the minute wheel 50
Of the manual correction shaft 60 via the ring teeth of
And transmitted to the hour hand wheel 40 via the pinion of the minute wheel 50. At this time, since the manual correction shaft 60 has the same phase as the minute hand pipe 241 of the minute hand wheel 24, it rotates at the same speed as the minute hand wheel 24, and the hour hand wheel 40 rotates at a reduced predetermined speed.

At the time of manual correction, the head 60b of the manual correction shaft 60 is manually rotated clockwise or counterclockwise. The rotation of the manual correction shaft 60 is transmitted to the minute hand pipe 241 of the minute hand wheel 24 via the minute wheel 50 and the hour hand 4
0 is transmitted. At this time, the minute hand pipe 24 of the minute hand wheel 24
1 is in phase with the manual correction axis 60, so that the manual correction axis 6
The wheel rotates at the same speed as 0, and the hour wheel 40 rotates at a reduced speed.

According to this embodiment, since the tip of the shaft support 32b of the fifth wheel & pinion 32A coincides with the position of the ring teeth 32a meshing with the stepping motor 31, it is provided on the shaft support 32b and the upper plate 13. The second fifth wheel & pinion 32A is stable even when an external force is applied to the timepiece in the state of being supported by the engagement shaft 13a, and the engagement shaft 13a is
It will not bend or be damaged. For this reason, even if the diameter of the engagement shaft 13a is reduced, an external force is applied to the timepiece during storage or transportation after assembly, or when the external force is applied during assembly, the engagement shaft 13 13a is not damaged, noise during the operation of the second hand drive system 30A is reduced, and the shaft support 32b is located at the same position as the ring teeth 32a. Simplification is realized.

[0029]

As described above, according to the present invention,
Even if external force is applied to the watch during storage or transportation after assembly, or by application of external force during assembly, damage to the shaft support can be prevented, and noise during operation can be reduced.
There are advantages such as simplification of component management.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of a hand drive system of an analog timepiece to which an embodiment of the present invention has been applied.

FIG. 2 is a diagram showing a configuration of a main part of the embodiment.

FIG. 3 is a sectional view showing the structure of the minute hand wheel of FIG. 1;

FIG. 4 is a diagram showing a configuration of a low torque pointer driving system portion of a conventional analog timepiece.

FIG. 5 is a diagram showing a gear structure of a conventional low torque pointer drive system.

FIG. 6 is a view showing another gear structure of a conventional low torque pointer driving system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Watch main body 11 ... Lower plate 12 ... Middle plate 13 ... Upper plate 30A ... Second hand drive system 31 ... Stepping motor 32A ... Second 5th wheel 32a ... Wheel tooth 33 ... Second hand wheel

Claims (1)

(57) [Claims] 1. A timepiece having a gear rotatably supported by a timepiece base plate and a wheel engaged with the gear and rotatably supported by the timepiece baseplate. A timepiece gear structure for transmitting a torque of a predetermined torque to a vehicle, wherein a shaft supporting structure of the gear and the timepiece base plate has a tip end of a protrusion from the gear supported by the base plate, A gear structure of a timepiece that is configured not to protrude beyond a mesh portion of a gear.