JP2524730Y2 - Clock train guide structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention relates to an improvement in a train wheel guide structure of a pointer type timepiece.

[Conventional technology]

FIG. 4 is a cross-sectional view of a wheel train guide structure of a conventional pointer-type timepiece. The third wheel & pinion 3 guides the lower tenon 3a by a mortise portion 1a of the base plate 1 serving as a base frame, and forms a dowel 1b on the outer peripheral portion of the gear 3b for preventing falling during assembly. At the time of installation in the automatic assembly line, the third wheel 3 is a tenon guide slope 1c of the main plate 1.
Until the mortise hole 1a is guided into the mortise 1a and the train wheel bridge 7 is assembled and the upper tenon 3c is guided and supported, the train wheel bridge 7 is assembled without being supported by the dowel 1b for preventing the base plate from falling down. The structure was easy.

[Problems to be solved by the invention]

However, in the prior art described above, due to a light impact or the like until the incorporation of the train wheel bridge in an automatic assembly line or the like, the train wheel protrudes above the handle hole engaging portion, and even when the train wheel bridge is assembled, the upper tenon is not removed. There has been a problem that the mounting failure is not widespread and parts are damaged.

Therefore, the present invention solves such a problem, and its purpose is to incorporate a wheel train, to improve mortise standing, and to prevent parts destruction due to a mortise of a wheel train during transportation in an automatic assembly line or the like. To prevent and provide product quality stability.

[Means for solving the problem]

A wheel train for displaying and transmitting the hands of a pointer-type timepiece, and a timepiece consisting of a base frame supporting the wheel train and holding a timepiece component, wherein at least one wheel train body portion of the wheel train or the vicinity of the side surface of the kana portion. A wall-shaped portion is formed on the base frame, and the wall-shaped portion is formed in an arc shape on an opposite side of the wheel train meshing with the wheel train, and a projection 1b is provided near an outer peripheral portion of a gear of the wheel train. The wheel train holding length H of the wall shape portion is formed longer than the engagement length I including the tenon and the slope of the wheel train, and the plane of the wall shape portion and the trunk portion or the kana portion of the wheel train is formed. The gap D is smaller than the width C of the tenon guide slope provided on the main plate for guiding and supporting the wheel train.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments. First
FIG. 2 is a plan view showing an embodiment of the present invention. FIG. 2 is a cross-sectional view showing the main wheel train section of FIG. 1 and 2, reference numeral 1 denotes a base plate serving as a base frame integrally formed of engineering plastic, and reference numeral 7 denotes a train wheel bridge also integrally formed of plastic, which guides and supports a tenon of each wheel train. I have. 2 is a second wheel with a minute hand, 4 is a fourth wheel with a second hand, and 3 is a third wheel that meshes with the fourth wheel 4 and the second wheel 2 for transmission. 6 is a rotor which is a rotor of the electromagnetic motor, 5 is meshed with the rotor 6 and the fourth wheel 4,
The fifth wheel and the eighth wheel for transmission are hour wheel with hour hand.

The third wheel & pinion 3 is guided by a slope 1c formed integrally with the main plate 1 at the time of assembling, and the lower tenon 3a and the lower tenon 1a are engaged and incorporated. While the train wheel bridge 7 is assembled, the upper handle is guided by the slope 7c formed in the upper mortise 7a of the train wheel bridge 7 without falling down by the fall prevention dowel 1b formed on the main plate 1. 3c is designed to be incorporated. The third wheel & pinion 3 has a wall-shaped portion 1d of the main plate 1 near the side surface of the key portion 3d. The height of the wall-shaped portion 1d is configured such that the holding length H between the pinion portion 3d of the third wheel & pinion 3 is longer than the engagement length I including the length of the tenon and the slope, and will be described later. As described in detail, even if the third wheel moves upward, it is structured to prevent the tenon from coming off. Further, the wall-shaped portion 1d of the main plate 1 has a crescent shape with a gap of D so that the third wheel 3 does not move on the side opposite to the second wheel in a plane, and the gap D is below the main plate. It is configured to be smaller than the width of the tenon slope 1c.

FIG. 3 shows a state in which the third wheel & pinion 3 comes off from the lower mortise during transportation of an automatic assembling line or the like before assembling the train wheel bridge 7 of FIG. 2 of the present invention. In this state, the third wheel 3 because it has still sectional retained length H ₁ fall outside the tenon and slope by the wall-shaped portion 1d of the base plate 1, never in the lateral direction displacement movement. Further, even if the plane clearance D is moved to the wall surface portion 1d, the lower tenon 3a of the third wheel & pinion 3 does not come off from the slope 1c because the plane clearance D <the ground plane slope width C. Due to its own weight, it is naturally incorporated into the mortise 1a.

Regarding the tenon of the train wheel when assembling the train wheel bridge, by forming a dovetail preventing dowel at the same time as forming a wall shape near the body or kana part to prevent it from coming off upwards, Smooth installation of the train wheel receiving becomes possible,
Parts such as the train wheel bridge and the main plate can be completely eliminated.

Although the present invention has been described with respect to an example in which a wall shape is formed on the base plate, the same effect can be achieved even when the present invention is applied to a train wheel bridge, a circuit bridge or the like. In addition, although the description has been given of the example in which the structure is integrally formed of plastic, the effect is the same even when the present invention is implemented with a metal ground plate or the like.

[Effect of the invention]

As described above, according to the present invention, a wall-shaped portion is formed by the base plate near the side surface of the trunk portion or the kana portion of the wheel train, and the holding length H between the wheel train and the tenon of the wheel train and the slope are formed. The engagement length is longer than the engagement length I, and the mortise of the train wheel can be prevented from being tenoned and the tenon can be improved during the transportation of the automatic assembly line, and the train wheel bridge can be smoothly assembled. The parts such as the train wheel bridge and the main plate can be completely eliminated. Furthermore, this leads to stabilization of the process of automatic assembly and stabilization of the quality of the assembled product, and the effect is great.

Furthermore, not only the assemblability of the train wheel is improved, but also the mortise is improved, as well as the mortise during transportation in the automatic assembly line and the fall of the train wheel are prevented. Can be returned to the original position again.

[Brief description of the drawings]

 FIG. 1 is a plan view showing an embodiment of the present invention. FIG. 2 is a sectional view showing a main wheel train section of FIG. FIG. 3 is a cross-sectional view showing a state before assembling the train wheel receiver of FIG. FIG. 4 is a main sectional view showing a conventional example. 1… Ground plate 2… Second wheel 3… Third wheel 4… Fourth wheel 7… Wheel train receiver

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mamoru Sato 6-31-1, Kameido, Koto-ku, Tokyo Seiko Electronic Industries Co., Ltd. 64-19190 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A wheel train guiding structure for a timepiece comprising a wheel train for displaying and transmitting a hand of a pointer-type timepiece, and a base frame supporting the wheel train and holding a timepiece component, wherein at least one wheel of the wheel train A wall-shaped portion is formed on the base frame near the side surface of the row body portion or the kana portion, and the wall-shaped portion is formed in an arc shape on an opposite side of the wheel train meshing with the wheel train. A protrusion 1b is provided in the vicinity of the outer peripheral portion of the wheel train, and the train wheel holding length H of the wall shape portion is formed longer than the engagement length I including the tenon and the slope of the train wheel. A wheel train guide structure for a timepiece, wherein a plane clearance D between a body portion and a kana portion of the train wheel is configured to be smaller than a width C of a tenon guide slope portion provided on a main plate for guiding and supporting the wheel train.