JPS6219985Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a two-hand watch, and more specifically, to the structure of a thin watch. Conventionally, for this type of watch, efforts were made to reduce the thickness of parts and the gaps between parts, etc.
Watches have been made thinner. However, there are limits to this method, so if you want to make the device even thinner, a different configuration or structure must be considered. Therefore, the present invention attempts to propose a structure that satisfies such requirements. According to the present invention, the above-mentioned objective is to first arrange the fourth gear that drives the minute hand gear and the date rear gear that is driven by the minute hand gear on almost the same plane for a minute hand gear having a minute hand. In order to omit the gap between the two, and to provide an alarm clock using such a device, a second hour hand gear that meshes with the hour hand gear having an hour hand and an indicator gear having an indicator hand, respectively, is provided. and a second indicator gear are arranged coaxially, and the second hour hand gear or the indicator cam plate associated therewith is arranged so that the fourth gear and the minute gear do not interfere with each other in a plane. . Furthermore, by making the outer circumferential surfaces of the two base plates that rotatably support the gear train of the timepiece above and below the external surfaces of the timepiece body, the thickness equivalent to the exterior parts can be omitted.

The embodiments shown in the drawings will be described below.

First, regarding the embodiments shown in FIGS. 1 to 3,
Its structure will be explained. The upper case 1 and the lower case 2 are molded from plastic material, and both are connected by screws 3.
are connected to each other by The inner surface of both cases above is
A mortise hole 2a for rotationally supporting the gear and pivot shafts 1b, 2b are integrally molded, and the outer surface is formed as the external appearance of the timepiece. The rotor pinion 4 is molded from a plastic material, and has mortise holes 4b on its upper and lower surfaces, which engage with the pivot shafts 1b and 2b of both cases, together with a pinion 4a. A rotor magnet 5 is fixed to the rotor pinion 4, and its circumferential surface has S and N poles magnetized at equal intervals. The stator 6 has a coil 28 coupled to a crystal oscillation circuit and a frequency dividing circuit (not shown).
For example, the magnets are alternately excited every 5 seconds. As a result, the rotor 4 intermittently rotates in one direction by 180 degrees every 5 seconds. The second gear 7, the third gear 8, and the fourth gear 9 are all molded from plastic material, and have pinions 7a, 8a, 9a, and tenons 7b, 8b, 9 that rotationally engage with the mortise holes 2a of the lower case, respectively.
b, and mortise holes 7c, 8c, and 9c that rotationally engage with the pivot shaft 1b of the case. In this way, the rotor pinion 4 and the gears 7, 8, 9 are pivotably received by the upper and lower cases 1, 2 and can rotate with low friction, and a reduction gear train is formed by sequentially connecting pinions and gears. 10 is a minute hand pinion, one end of which is rotatably supported by the lower case 2 and passes through the case 2;
A hand turning knob 11 is fixed to the tip, and the other end is rotatably supported on the inner periphery of a pipe 14a of an hour hand gear 14, which will be described later. And the above minute hand kana 10
has a groove 10a in its midsection, and a minute hand 1 at the tip.
The minute hand shaft 16 fixed at 5 is press-fitted and fixed. 1
2 is a minute hand gear that meshes with the pinion of the No. 4 gear, and has two elastic arms 12a having circular arc portions 12b. The elastic arm 12a engages with the groove 10a of the minute hand pinion, and the minute hand pinion 10 and the minute hand gear 12 form a slip mechanism well known in clock mechanisms. Reference numeral 14 denotes the above-mentioned hour hand gear, which is gear-coupled to the minute hand pinion 10 via the date gear 30.

Here, as shown in Figs. 1 and 2, if the No. 4 gear and the reverse gear are arranged so that they do not interfere with each other in a plane, and if they are placed in the space between the minute hand wheel and the hour hand wheel, then one stage of gears can be used. One of the objectives is achieved because the height space can be reduced. The pipe of the hour hand gear 14 passes through the pipe of the indicator gear 18 while being rotationally supported by the pipe, and the hour hand 25 is fixed to the tip thereof. The pipe 18a of the guide gear passes through the upper case 1 while being rotatably supported by the same, and a guide needle 17 is attached and fixed to the tip of the pipe 18a. Reference numeral 19 denotes a second reference gear that meshes with the above-mentioned reference gear, and is rotatably supported by a shaft 1c installed in the upper case 1. As detailed in FIG. 3, one end is vertical and the other end is inclined. Two cam holes 19a having surfaces are arranged on different radii. Also, the shaft 1c of the upper case
and rotatably supported by the shaft 2c of the lower case,
A second hour hand gear 20 that meshes with the hour hand gear 14 is placed on the second indicator gear 19, and has two holes 20a corresponding to the cam holes 19a of the second indicator gear, as shown in FIG. This hole 20a is also formed with one side being a vertical surface and the other side being an inclined surface. The guide cam plate 21 is rotatable and guided so as to be vertically movable by the center pipe of the second hour hand gear 20, and corresponds to the hole 20a of the second hour hand gear and the cam hole 19a of the second guide gear. It has two cams 21a that
1a passes through the hole 20a of the second hour hand gear and normally slides on the surface of the second reference gear 19, one surface of the cam is a vertical surface 21b, and the other surface is an inclined surface 2.
1c. 22 is a guide pinion that meshes with the second guide gear 19, and on the top thereof,
It has an elastic arm 22a that engages with a click portion 2d formed in the lower case 2, the upper end of which passes through the lower case, and a reference time set knob 23 is fixed to the upper end. On the other hand, the detection switch 24 is related to the reference cam plate 21, and is normally opened by the reference cam plate 21, and when the cam 21a of the reference cam plate falls into the cam hole 19a of the second reference gear, it is activated by its own spring force. Closed. Then, the detection switch 2
Reference numeral 4 controls the gate of the alarm control circuit 26, and when the gate is closed, the gate is opened and the alarm device 27 is activated.

As shown in Fig. 2, if the fourth gear, the second hour gear, the second hour hand gear, or the reference cam plate are arranged so that they do not interfere with each other in the plane, they will interfere with each other in the height direction. This allows the height space to be minimized. In addition, when the target time is reached, the target cam plate only acts in the axial direction, and the second
Since the hour hand gear and the second indicator gear do not act in the axial direction, the thickness of the gear parts of the hour hand gear, second hour hand gear, indicator gear, and second indicator gear can be made thinner, and the height space is also advantageous. Become. As mentioned above, if the outer surfaces of the upper and lower cases are used directly as the exterior surfaces of the watch, there is no need for additional exterior parts to cover the movement, and the required thickness of the exterior parts can be omitted, making the watch even more attractive. It can be made thinner.

As explained above, according to the present invention, the watch can be made extremely thin, making it possible to provide a small and pocketable watch.Also, since the main plate of the movement is configured to double as an exterior part, it is possible to make the watch extremely thin. This also has the advantage of being advantageous in terms of cost as it can eliminate the cost.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention, FIG. 2 is a plan view of the inside of the watch shown in FIG. 1, and FIG. 3 is a cross-sectional view of the reference detection section in FIG. 1. 1... Upper case, 2... Lower case, 9... 4th gear, 10... Minute hand kana, 30... Back gear.

Claims (1)

[Scope of utility model registration request] In a two-hand watch that drives a minute hand and an hour hand from an electromechanical converter via a gear train, a fourth gear that drives the minute hand gear, a date back gear that is connected to a pinion of the minute hand gear and drives the hour hand gear; a first guide gear that is coaxial with the minute hand gear and the hour hand gear and has a guide hand; a second guide gear that meshes with the first guide gear; and a second hour hand gear that is coaxial with the second guide gear and meshes with the hour hand gear. , a guide cam plate that is coaxial with the second guide gear and acts on the second guide gear and the second hour hand gear to detect the alarm time;
This wheel train of a timepiece is characterized in that the number gear, the rear gear, and the second hour hand gear do not interfere with each other in a plane, and the fourth gear and the rear gear are arranged almost on the same plane.