JPH0545995Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a train wheel guide member structure for a train wheel that enables a watch to be in two states: normal carrying and time adjustment.

[Summary of the idea]

This invention uses a clutch plate that is linked to an external operating member to connect and disengage the second wheel and third wheel with the minute hand in the structure of the wheel train guide member for a watch wheel train, and the rotation to the fourth wheel with the second hand. To provide a simple structure that enables time adjustment of hours and minutes without transmitting information.

[Conventional technology]

The wheel train structure of the conventional clock structure is such that the second wheel is equipped with a gear that has a pinion pinion and has elasticity at the center, and rotation is transmitted to the second wheel by an external operating member, and the gear is moved between the pinion and the center wheel. By rotating freely, it is possible to adjust the hours and minutes without transmitting rotation to the fourth wheel.

[Problem that the invention attempts to solve]

Conventionally, the wheel train structure has the following problems because the spring elastic part is formed in the second wheel gear with an outer diameter of about 3 mm, and there is no margin for spring design.

(1) The slipping torque of the second gear is not stable, so break-in of the spring part is required.

(2) If there are large variations in parts and the slippage torque is too high, it will cause wear and damage to the external correction mechanism (second pinion, sun gear, small iron wheel, wheel wheel, etc.). Therefore, the external correction mechanism parts must be made of metal or hardened materials, which have poor workability and cannot reduce costs.

(3) On the other hand, if the slippage torque is too low, a slight impact will add rotational moment to the minute hand when the watch is being carried, causing a slipping phenomenon, causing the minute hand to rotate independently and causing a time lag.

Therefore, in order to solve these problems, the present invention abolishes the conventional gear sliding mechanism that uses minute spring torque of the second gear, and provides a structure that partially disengages the gear train part when adjusting the time. The purpose is to provide a structure that ensures the reliable operation of the guide member.

[Means for solving problems]

To disengage a part of the gear train when adjusting the time, either move the entire corresponding numbered wheel, that is, both the upper and lower wheels in parallel to attach and detach the gears and pinion mesh, or move the upper and lower gears in parallel.
It is conceivable to move either the lower or lower part and tilt the number wheel to attach and detach the gear or pinion engagement, but the present invention will be described with regard to the latter structure.

[Effect]

In this invention, in order to position the clutch plate that guides the number wheel in order to move it, the engaging part that interlocks with the external operating member is made of an elastic body, thereby stabilizing the amount of engagement between the wheel trains in the normal carrying state. This is how it was done.

〔Example〕

To fix the seconds and adjust the hours and minutes, you can either engage and disconnect between the second gear and the third pinion, or connect and disconnect between the third gear and the fourth pinion.
This embodiment is an example of the former and will be described in detail below based on the drawings.

FIG. 1 is a plan view of the present invention, FIG. 2 is a cross-sectional view taken along the line A-A', and FIG. 3 is a cross-sectional view showing the clutch plate and the winding stem contact portion.

1 is a main plate which is a watch frame, and 2 is a winding stem which is an external operating member. When the winding stem is in a portable state, it is loosely engaged with the wheel 3, and when the winding stem is pulled out to adjust the time, it frictionally engages with the wheel 3 and transmits rotational force of the winding stem. The winding stem has an uneven portion 2-a that functions as a click, and an elastic portion 4-a of the battery positive terminal 4.
The plane position is determined by engagement with the

Reference numeral 5 denotes a clutch plate, and on the clutch plate there is provided a gear train guide holding portion for the lower part 6-a of the third wheel & pinion 6, and the gear train is guided around a shaft 1-a provided on the main plate as the center of rotation.

The clutch plate has an elastic portion 5-a that comes into contact with the winding stem tip 2-b in the carrying state, and the tip portion 5-d is positioned by making contact with the main plate, and the second gear 8-a and the third pinion 6 -b meshes.

Reference numeral 8 is the second wheel, which is made up of the aforementioned gear and pinion 8-b, and a minute hand is attached to the tip. 9 is the sun wheel and is always engaged with the second kana and the wheel 3. 10 is an hour wheel, the gear meshes with the hour hand, and the hour hand is attached to the tip. The gear train part is the fifth wheel & pinion 11,
It consists of a rotor 12, and 13 is a gear train bridge that guides the rotor, the fifth wheel, the fourth wheel, the third wheel, and the top of the second wheel. The bottom of each wheel, except for the third wheel, is guided by main plate 1. The rotor is rotated by an electric signal, decelerated by gears, and each number wheel displays seconds, minutes, and hours in an analog manner, and performs a known function.

Next, the time adjustment state will be explained. By pulling out the winding stem, the restriction on the position of the clutch plate by the tip of the winding stem is released, and the clutch plate is aligned with the main plate axis 1-a.
It is rotated clockwise by the U-shaped elastic portion 5-c with the rotation center at , and the tip end portion 5-d comes into contact with the reset pin 7 implanted in the base plate.

The lower part of the third wheel is guided and held by a clutch plate.
As described above, since the clutch plate operates, it tilts using the third uppermost side 6-c of the gear train bridge as a guide, and the third pinion and the second gear are disengaged from each other. In conjunction with this, the wheel is connected to the winding stem convex portion 2-b by interference, and the rotation of the winding stem is controlled from the rear gear to the second wheel and pinion.
The hour wheel makes it possible to adjust the hours and minutes while keeping the second hand fixed.

The present invention provides a new structure that improves the stability of positioning the clutch plate that guides and holds the third wheel.

The amount of engagement between the second gear and the third pinion in the mobile state is:
It is approximately 0.1 to 0.15 mm, and in order to stabilize the gear train efficiency, the clutch plate must be constantly guided to a fixed position. The clutch plate engages with the tip of the winding stem, and the clutch plate tip 5-d contacts the base plate 1-b and is positioned.

The clutch plate that comes into contact with the tip of the winding stem has an elastic portion that absorbs displacement of the tip of the winding stem, and this elastic force is larger than that of the U-shaped elastic portion 5-c.

As is clear from the figure, the position of the clutch plate relating to the meshing of the second wheel and third wheel is determined only by the rigid portion, and a structure is provided in which the clutch plate operating portion is provided with an elastic body.

The wheel train structure in which the second wheel and third wheel are engaged and disengaged by the action of the clutch plate eliminates the need for the conventional sliding mechanism using the metal second gear by improving the positioning structure of the clutch plate. The rotational load during time adjustment can be reduced to almost zero, eliminating the drawbacks of the conventional structure mentioned above, and
All wheel train members can be made of plastic, simplifying manufacturing and reducing parts costs.

Further, although the winding stem, which is an external operating member, is directly brought into contact with the clutch plate as a member for operating the clutch plate, the same effect can be obtained by interposing another motion transmitting member between the external operating member and the clutch plate.

Also, the difference between the elastic force of the winding stem abutting part of the clutch plate and the elastic force of the U-shaped elastic part that operates the entire clutch plate is:
It is necessary that the elastic force of the winding stem contact portion be large, and the larger the difference, the better.

[Effect of idea]

As described above, according to the present invention, the engaging part that interlocks with the external operating member of the clutch is provided with an elastic part and a rigid part that is positioned in contact with the main plate, so that there is no significant variation in dimensions. Even if the winding stem is erroneous, the variation error can be absorbed without affecting the meshing of the gears, and the clutch plate can always be guided to a fixed position.
It is possible to provide a timepiece body with an extremely high quality wheel train structure, by constantly stabilizing the amount of meshing of the gears and without reducing the efficiency of gear transmission force due to wear of the gears or variations in meshing.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the present invention in a normal carrying state. FIG. 2 is a sectional view taken along line A-A' in FIG. FIG. 3 is a sectional view showing the clutch plate and the winding stem contact portion. 1... Main plate, 2... Winding stem, 5... Clutch plate,
6...Third wheel, 8...Second wheel.

Claims (1)

[Scope of claim for utility model registration] A winding stem which is an external operating member, a reset pin implanted in the main plate, a fourth wheel with a second hand, a third wheel with a second hand, and a second wheel with a minute hand, which are bearing between the main plate and the bearing. A wheel train guide member for a watch consisting of a wheel train such as a number wheel, and a clutch plate that bears one side of the third axle, rotates around a shaft provided on the main plate, and is interlocked with the external operating member. In the structure, the clutch plate is composed of an elastic part that is interlocked with an external operating member and a tip part, and the tip part is positioned in contact with a convex part provided on the main plate, and also comes into contact with the reset pin when adjusting the time. A timepiece wheel train guide member structure characterized by the following.