JPH0523180U - Hand wheel of mobile watch - Google Patents

Abstract

(57) [Abstract] [Purpose] In a pointer wheel, two pointer gears that are selectively attached to the axle can be prepared without increasing the cost. [Structure] As a minute hand gear 12, a punch recess 12e is formed in a connecting portion 12d between a tooth portion 12a and arms 12b and 12b.
A minute hand gear 12A having no punch and a minute hand gear 12B having a punch recess 12e are prepared, and one of the minute hand gears 12 is selected and the axle 11 is press-fitted into its center hole 12c. For example, in the case of an ordinary wristwatch, the minute hand wheel 1 in which the axle 11 is press-fitted into the center hole 12c of the minute hand gear 12B.
Use 0. On the other hand, in the case of a wristwatch using a large minute hand, the minute hand wheel 10 in which the axle 11 is press-fitted into the center hole 12c of the minute hand gear 12A is used.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention can be applied to mobile watches such as watches and pocket watches. More specifically, the present invention relates to a hand wheel such as a minute hand wheel in such a portable timepiece in which a hand wheel is attached to an axle.

[0002]

[Prior Art]

 For example, in a minute hand wheel, the axle is usually formed by press-fitting the axle into the center hole of the minute hand gear. For example, a diver's watch has a large hand that is attached with a large hand for reasons such as design.In such a portable timepiece, the inertial force applied to the minute hand when a shock is applied increases, and the minute hand gear and axle There was a case where slippage occurred at the press-fitting joint between and, the axle rotated, and the hands moved, causing the time display to go wrong.

In order to solve such a problem, it is conceivable to strengthen the press fit between the center hole and the axle, but this was very difficult in manufacturing.

Therefore, in some conventional minute hand wheels, for example, two minute hand gears 1 as shown in FIGS. 3 and 4 are prepared and selectively attached to the axle 2. The minute hand gear 1 is formed by arranging two parallel arms 1b and 1b in the radial direction in an annular tooth portion 1a and providing a center hole 1c in the center thereof. Then, a minute hand gear 1A having narrow arms 1b and 1b as shown in FIG. 4 and a minute hand gear 1B having wide arms 1b and 1b as shown in FIG. 3 are prepared. Then, in the case of an ordinary portable timepiece, a minute handwheel in which the axle 2 is press-fitted into the center hole 1c of the minute hand gear 1A having the narrow arms 1b and 1b shown in FIG. 4 is used. In the case of a portable timepiece that uses a large hand like this, a minute hand wheel in which an axle 2 is press-fitted into its center hole 1c using a minute hand gear 1B having wide arms 1b 1b as shown in FIG. 3 is used. .

Thus, in the minute hand wheel using the minute hand gear 1A shown in FIG. 4, the slip torque can be reduced, and the operability of the crown can be improved especially in the female portable timepiece. On the other hand, in the minute hand wheel using the minute hand gear 1B of FIG. 3, the press-fitting coupling force between the axle 2 and the minute hand gear 1B is strengthened, and in particular, the time deviation due to inertia when a mobile watch such as a diver's watch is impacted. Was prevented.

[0006]

[Problems to be solved by the device]

 However, conventionally, the minute hand gear is usually formed by first punching out the surrounding annular portion and the arms 1b and 1b, then cutting the outer periphery, and finally punching out the center hole 1c. Therefore, in order to prepare two minute hand gears having the narrow arms 1b and 1b and the wide arms 1b and 1b, it is necessary to prepare two complicated molds, which increases the cost. There was a problem.

Therefore, an object of the present invention is to provide, in a pointer wheel, two pointer gears that are selectively attached to an axle without increasing the cost.

[0008]

[Means for Solving the Problems]

 Therefore, the present invention forms a pointer gear such as the minute hand gear 12 by an annular tooth portion 12a and two parallel arms 12b and 12b extending in the radial direction thereof, as shown in the following illustrated embodiments, for example. In a pointer wheel such as a minute wheel 10 of a portable timepiece in which an axle 11 is elastically sandwiched between the arms 12b and 12b of the pointer gear and the pointer gear is attached to the axle 11, A pointer gear such as a minute hand gear 12A having no punch concave portion 12e and a pointer gear such as a minute hand gear 12B having a punch concave portion 12e are selectively provided at a connecting portion 12d between the portion 12a and the arms 12b and 12b. It is characterized in that it is attached to the axle 11.

[0009]

[Action]

 In this invention, when a pointer such as a relatively large minute hand is assembled to the minute hand wheel 10, a minute hand gear 12A having no punch recess 12e is selected and attached to the axle 11, and the axle 11 is connected to the arm 12b. It is sandwiched between 12bb by a large elastic force.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows a minute hand wheel of a wrist watch according to an embodiment of the present invention. The minute hand wheel 10 includes an axle 11 and a minute hand gear 12. The axle 11 has a minute hand pinion 11a. Then, either one of the two minute hand gears 12A and 12B having different shapes shown in FIGS. 1A and 1B is selectively attached to the upper end of the axle 11 in the figure as appropriate.

As shown in FIG. 1, the minute hand gear 12 is formed by radially extending two horizontal arms 12b and 12b in an annular tooth portion 12a and providing a center hole 12c in the center thereof. When the minute hand gear 12A shown in FIG. 1 (a) is machined, for example, the surrounding annular portion and the arms 12b and 12b are first punched, the outer periphery is trimmed, and finally the central hole. 12c is punched out to form the minute hand gear 12A.

When machining the minute hand gear 12B shown in FIG. 1 (b), the outer peripheral teeth are cut in the same manner as in the case of (1) and then when the center hole 12c is punched out, the tooth portion 12a and the arm 12b. The punch recess 12e is punched out at the connecting portion 12d with 12b to form the minute hand gear 12B.

However, in the case of a normal wristwatch, the minute hand wheel 12B having the punch recess 12e shown in FIG. 1B is used, and the minute wheel 10 having the axle 11 pressed into the center hole 12c is used. On the other hand, in the case of a wristwatch using a large minute hand such as a diver's watch, a minute hand gear 12A having no punch recess 12e as shown in FIG. 1 (a) is used, and a minute hand in which the axle 11 is press-fitted into its center hole 1c. Use the car 10. Then, the axle 11 is sandwiched between the arms 12b and 12b by a relatively large elastic force to prevent the axle 11 from rotating due to an impact or the like.

By the way, in the above-described embodiment, when the minute hand gear 12B shown in FIG. 1 (b) is machined, the punch recess 12e is formed by punching in the center hole forming step, but at the same time as the center hole forming step. Alternatively, the press process may be separately performed in the previous step or the like.

[0015]

[Effect of the device]

 Therefore, according to the present invention, when the pointer gear is machined, only one complicated die used in the press process of the arm is required, and therefore, in the pointer wheel, two pointers selectively attached to the axle are provided. Gears can be prepared without increasing costs.

[Brief description of drawings]

1A and 1B respectively show a minute hand gear of a minute hand wheel according to an embodiment of the present invention, FIG. 1A is a minute hand gear without a punch recess, and FIG. 1B is a minute hand with a punch recess. It is a top view of a gear.

FIG. 2 is a vertical sectional view of the minute hand wheel.

FIG. 3 is a plan view showing a conventional minute hand gear having a wide arm.

FIG. 4 is a plan view showing a conventional minute hand gear having narrow arms.

[Explanation of symbols]

 10 minute hand wheel (indicator wheel) 11 axles 12A and 12B minute hand wheel (indicator wheel) 12a tooth part 12b arm 12d connecting part 12e punch recess

Claims (1)

[Scope of utility model registration request] 1. A pointer gear is formed by an annular tooth portion and two parallel arms extending in the radial direction, and an axle is elastically sandwiched between the arms of the pointer gear, and the pointer is attached to the axle. In a hand wheel of a portable timepiece configured by attaching a gear, a hand wheel having no punch recess and a hand gear having a punch recess are selectively attached to the axle in a connecting portion between the tooth portion and the arm, Handwheel for mobile watches.