JP2002207086A - Timepiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a timepiece preventing fluctuation of hands. SOLUTION: Projection parts 18b, 18c and 18d are projected from a hand seat 18 side towards a hole part 18a. These projection parts 18b, 18c and 18d are formed in lengths positioning more center side than the diameter of the shaft part 12a, respectively. On the hand seat 18, when the hole part 18a in the center is inserted in the shaft part 12a during assembling, the projection parts 18b, 18c and 18d press the shaft part 15. In other words, a repulse force of pressing is added to the hand seat 18 and the shaft part 12a is bitten.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a timepiece for preventing wobbling of a hand.

[0002]

2. Description of the Related Art FIG. 3 is a sectional view showing a general timepiece mechanism. FIG. 4 is an enlarged sectional view showing a main part of FIG. In this timepiece, a main plate 1 arranged on the dial side, a train wheel bridge 2 arranged on the back cover side, the main plate 1 and the train wheel bridge 2 are arranged.
A driving mechanism for driving hands such as the minute hand 4 and the hour hand 5 is supported by the second main plate 3 disposed between the first and second base plates.

[0003] The base plate 1 and the second base plate 3 support a coil block 6 and a stator 7. The main plate 1 and the train wheel bridge 2 rotatably support the rotor 8 in opposition to the stator 7, and a third wheel 9 and a second wheel 10 to which the rotational force from the rotor 8 is transmitted. Hour wheel 11 and hour wheel 1
2 is supported. In addition, a display wheel support 13 is attached to the main plate 1.

As described above, in each wheel and axle of the drive mechanism supported by the shaft, wobbling occurs when the hands such as the minute hand 4 and the hour hand 5 are driven. In particular, in the case of a needle having a heavy self-weight such as a character design, the wobble becomes large. For this reason, a structure is known in which the needle seat 14 is disposed between the second main plate 3 and the hour wheel 12 to apply pressure to the hour wheel 12 so as to suppress wobble and thereby to prevent uneven hand movement.

FIG. 5 is an explanatory view for explaining a conventional needle seat. (A) shows a plane of the needle seat, and (b) shows a side surface at the time of mounting. This needle seat 14 is a thin ring-shaped circular member. The needle seat 14 has a hole 14a in the center portion and
2a, and insert a receiving member (not shown) from above into the needle seat 1
4 is fixed with a gap that does not cause plastic deformation.

[0006]

However, in the conventional timepiece described above, if the length of the axle is short at the time of assembling, the needle seat is not stable until the receiving member is installed after the needle seat is assembled. Had the problem of flying. For this reason, there has been a problem that the assembling time is long and the cost is high. Also, there is known a method of assembling the vehicle by linking the needle seat to a car and stabilizing the disc by lubricating. However, even in this case, there is a problem that the number of assembling steps increases and the cost increases. Further, in this case, the amount of oil may be excessive, and the stopping condition may be poor and may come off.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a timepiece that can reliably incorporate a needle seat at the time of an assembling operation to reduce the cost.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention has a rotary shaft for attaching a needle and rotating the needle, and a grip portion for gripping and fixing the rotary shaft. And a handpiece. By providing the holding portion on the needle seat, the needle seat can be reliably incorporated into the rotary shaft body.

Further, according to the present invention, the grip portion includes:
A clock provided on an inner peripheral portion of a center hole of the needle seat, wherein the projection elastically deforms and holds the rotary shaft when the needle seat is pivotally supported on the rotary shaft. It is.

Further, the grip portion is a surface of a portion narrow in the width direction of the needle seat, and when the needle seat is pivotally supported on the rotary shaft, the surface is elastically deformed in a plane. This is a timepiece in which the rotating shaft is held.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. The present invention is not limited by the embodiment. The mechanism of the timepiece is the same as that of the conventional one, and the same components are denoted by the same reference numerals.

(Embodiment 1) FIG. 1 is an explanatory view for explaining a needle seat fixing structure according to Embodiment 1 of the present invention.

(A) shows a plane of the needle seat, and (b) shows a side surface at the time of mounting. The needle seat 18 is a thin ring-shaped circular member. The needle seat 18 has a hole 18a in the center. In particular, projecting portions 18b, 18c, 18d project from the needle seat 18 toward the hole 18a from the hole 18a. The projections 18b, 18c, 18d
Are formed to have a length located on the center side of the outer diameter of the axle portion 12a.

In the needle seat 18 having the above-described structure, when the hole 18a in the center portion is inserted into the axle portion 12a during assembly, the protruding portions 18b, 18c, 18d press the axle portion 12a. In other words, the force due to the reaction when the needle seat 18 is pressed is applied to the needle seat 18 to hold the axle portion 12a and prevent the needle seat 18 from flying due to static electricity or the like. In this manner, with the axle portion 12a held, the receiving member (not shown) is fixed from above with a gap such that the needle seat 18 is not plastically deformed, and assembled.

In the case of a small timepiece such as a wristwatch, the needle seat 18 has a thickness of about 0.02 to 0.03 mm, the longest portion has a diameter of about 2.5 to 5 mm, and an inner diameter of about 2.5 to 5 mm. A thin plate of about 1.2 to 2 mm is preferred. Further, the needle seat can be formed by bending an elastic metal material such as beryllium copper or stainless steel cut into a circle. In the above description, the number of protrusions is not limited to three, but may be one, two, four, or more.

According to the first embodiment, the needle seat can be securely incorporated at the time of the assembling operation, so that the cost can be reduced.

(Embodiment 2) FIG. 2 is an explanatory view for explaining a needle seat fixing structure according to Embodiment 2 of the present invention.
(A) shows a plane of the needle seat, and (b) shows a side surface at the time of mounting. The needle seat 19 has an outer shape obtained by cutting out a thin circular plate-shaped member. The needle seat 19 has a hole 19a in the center. In particular, the hole 19a has straight portions 19b, 1
9c is molded. In addition, linear portions 19d and 19e are formed on the outer shape of the needle seat 19 as well as the linear portions 19b and 19c. That is, the linear portions 19b and 19c and the linear portion 19
The surface of the needle seat 19 formed by d and 19e is thinner in width than the arcuate surface, and can be elastically deformed in a planar manner so as to spread in the width direction.

In the needle seat 19 having the above-described configuration, when the central hole 19a is inserted into the axle portion 12a during assembly, the linear portions 19b and 19c press the axle portion 12a. The needle seat 19 holds the axle portion 12a by the force of the reaction when pressed down, and the linear portion 19b,
Since the surface of the needle seat 19 formed by 19c and the linear portions 19d and 19e is elastically deformed in a plane, the needle seat 19 is attached to the axle portion 12a in a stable state. As a result, flying of the outer shape of the needle seat 19 due to static electricity or the like is prevented. In this state, the receiving member (not shown) is attached to the needle seat 1 from above.
9 is fixed with a gap that does not cause plastic deformation, and then assembled.

In the case of a small timepiece such as a wristwatch, the needle seat 19 is preferably a thin plate having the same thickness, outer diameter and inner diameter as in the first embodiment. Similarly, the needle seat 19 may be formed by bending an elastic metal material cut out in a circular shape.

According to the second embodiment, the needle seat can be securely incorporated at the time of the assembling operation, so that the cost can be reduced. Furthermore, since the elastic deformation is performed two-dimensionally, the needle seat 19 can be held more stably in the axle portion 12a.

In the first embodiment, the case where the protrusion is provided has been described. However, instead of providing the protrusion, the length of the hole of the needle seat is located closer to the center than the outer diameter of the axle portion 12a. It may be formed into a diameter, and a notch may be provided on the hole side. This also allows the portion between the notches to obtain the same operation and effect as the above-described protrusion. In the second embodiment, the case where the outer shape is formed into a linear shape has been described. . Also with this, since stable elastic deformation can be obtained, the same operation and effect of holding the needle seat in the axle portion 12a more stably can be obtained.

As described above, according to the needle seat fixing structure of the present invention, the needle seat can be securely incorporated at the time of the assembling operation, so that the effect of reducing the cost can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a structure for fixing a needle seat according to a first embodiment of the present invention;

FIG. 2 is an explanatory view illustrating a structure for fixing a needle seat according to a second embodiment of the present invention.

FIG. 3 is a sectional view showing a general timepiece mechanism.

FIG. 4 is an enlarged sectional view showing a main part of FIG.

FIG. 5 is an explanatory view illustrating a conventional needle seat.

[Explanation of symbols]

 12 hour wheel 12a axle part 14 needle seat 14a hole part 18 needle seat 18a hole part 18b, 18c, 18d projecting part 19 needle seat 19a hole part 19b, 19c, 19d, 19e linear part

Claims (3)

[Claims] 1. A timepiece comprising: a rotating shaft body to which a needle is attached to rotate the needle; and a needle seat having a grip portion for gripping and fixing the rotating shaft body. 2. The holding portion is a projection provided on an inner peripheral portion of a center hole of the needle seat. When the needle seat is pivotally supported on the rotating shaft, the projection is formed by the projection. The timepiece according to claim 1, wherein the rotating shaft body is elastically deformed and held. 3. The grip portion is a surface of a narrow portion in the width direction of the needle seat, and when the needle seat is pivotally supported on the rotating shaft body, the surface is elastically deformed in a planar manner. 2. The method according to claim 1, wherein the rotating shaft body is held.
The clock described in.