JPH0725746Y2 - Alarm clock train structure of electronic clock - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a wheel train structure of a pointer type electronic wrist watch, particularly a minute alarm.

[Conventional technology]

FIG. 5 shows a sectional view of a main part of a conventional alarm train wheel structure in which a minute alarm is added to a pointer type electronic wrist watch, and FIG. 6 is a plan view of the main part showing the arrangement of the train wheel part. The rotation transmitted from the drive wheel train (not shown) has a second hand 3 having a second hand 2 fitted to a second hand shaft 1 and a minute hand shaft to which a minute hand 4 is fitted.
It is transmitted to the minute gear 6 fixed to the minute pinion 5 integrally formed with 5a. Further, from the minute pinion 5 to the Hino back wheel 9 consisting of the Hino back wheel 7 and the Hino back pinion 8, the hour hand shaft from the Hino back wheel 9
Rotation is transmitted to the hour wheel 12 having the hour hand 11 fitted in the 10a, and a known wheel train is constructed. Here, the size of the minute pinion 5 is set under the condition that the rotation speed of the minute pinion 5 is 12 times that of the hour wheel 12 as is well known. The number of teeth of the minute pinion 5 is about 10, and the module has a pitch diameter of about 1 mm with a pitch diameter of about 1 mm. On the other hand, since the minute hand shaft 5a is positioned so as to be sandwiched between the second hand shaft 1 and the hour hand shaft 10a, the body diameter B of the hour hand shaft 10a is determined, and usually the body diameter B The minimum value is around 1 mm depending on the processing conditions. Therefore, the outermost diameter of the split pinion 5 and the body diameter B are approximately the same, and the root diameter A of the split pinion 5 is generally smaller than the body diameter B as shown in the figure. Is usually.

Therefore, a contact wheel that synchronizes with the minute pinion 5 and requires the same number of revolutions
13 is a shape larger than the minute pinion 5,
It is rotatably attached to 12 body diameters B. The minute contact car
The rotation transmission to 13 is carried out from the Hinoura Kana 8 via a middle wheel 14 provided to rotate in the same direction as the respective hands, and the Hinouraden E wheel 15 is composed. It is performed by Ekana 16 and Hino Uraden Egear 17. A minute contact spring 18 is fixed to the minute contact wheel 13, and when the alarm is not set, the minute contact spring 18 has a minute indicator hand 19 fitted thereto and is formed of a synthetic resin. A conductive member 21 and a non-conductive member 2 which are circumferentially provided in a strip shape on a surface 20a facing the split contact spring 18.
The non-conductive member 22 of the laminated contact plate 23 made of 2 is pressed and slid.

The split contact spring 18 is a support surface of the hour wheel 12 and is made of a conductive member from the main plate 24, which is anode-grounded (not shown), to the hour wheel 12 and is also made of the electrically conductive member from the hour wheel 12. Further, electrical continuity is achieved through the split contact wheel 13. At the time of alarm setting, the split contact spring 18 contacts the conductive member 21 arranged in the cutout portion (not shown) of the non-conductive member 22, and the anode current is used as an alarm signal for the conductive member 21. It is led to an alarm circuit (not shown) through a guide lead plate 25 which is electrically connected to the member 21.

Incidentally, the intermediate transfer car 14 and the Hinoura transmission car 15 are pivotally supported by the main plate 24, and 26 is the intermediate transfer car 14 and the Hinoura transmission car 15.
And a reference support plate for supporting the alarm reference vehicle 20, respectively.

[Problems to be solved by the device]

As described above, in order to add the minute alarm function to the conventional pointer wheel train, the minute contact wheel, which is larger than the minute minute pinion, is mounted on the barrel of the hour wheel in synchronism with the minute pinion at the same rotational speed. There is a need. For that purpose, the Hinoura transmission wheel that receives the transmission from the Hinoura vehicle that constitutes the pointer wheel train and meshes with the minute contact wheel is naturally larger than the Hinoura vehicle, and It is also necessary to use an intermediate wheel for matching the rotation direction of the contact wheel with the minute pinion. For this reason, in the conventional minute alarm train wheel, in addition to the pointer train wheel, a new car that pivots is added and it is necessary to provide a large arrangement space near the center of the watch
In particular, the addition of the minute alarm function on a small watch is a major bottleneck in terms of wheel train arrangement. An object of the present invention is to solve the above problems and to provide a minute alarm train wheel structure suitable for a small timepiece.

[Means for Solving the Problems]

In order to achieve the above object, the present invention has the following configuration. That is, a minute contact wheel having the number of teeth and the module equal to the minute pinion forming the indicator wheel train and having a root diameter equal to or larger than the barrel diameter of the hour wheel is provided between the hour wheel and the alarm reference wheel. The intermediate contact wheel is integrally formed coaxially with the Hino back wheel.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of an essential part showing an alarm wheel train structure of an electronic wrist watch according to an embodiment of the present invention, and FIG. 2 is a plan view showing a planar meshing relationship of the essential wheel train part.

The rotation transmitted from the drive wheel train (not shown) to the minute gear 30 is transmitted through the minute pinion 32 having the minute gear 30 fixed thereto and the minute hand 31 fitted at the tip end thereof to the sun gear reverse gear 33 and the date wheel. It is transmitted to Hinoura Kurashi 35, which consists of Nora Ura 34. The split pinion 32 has the same number of teeth as that of the conventional split pinion 5 (shown in FIG. 5), and the pitch circle diameter is increased by a module. The Hinoura Kana 34
Engages with the hour wheel 37 in which the hour hand 36 is fitted and constitutes a well-known pointer wheel train. Reference numeral 38 is a second wheel to which a second hand 39 is fitted, and rotation is transmitted from a drive wheel train (not shown) via a second gear 40. Reference numeral 41 denotes a split contact wheel having the same number of teeth and modules as the split pin 32 and molded of synthetic resin, and an engaging portion 41a of the split contact wheel 41 is rotatably attached to a body portion 37a of the hour wheel 37. It is mounted, and the split contact wheel 41 is arranged between the hour wheel 37 and the alarm reference wheel 45. Further, the tooth contact portion 41b of the split contact wheel 41 meshes with a split contact intermediate wheel 42 which is provided at an end portion of the Hino back wheel 35 and detachably attached to a corner portion 35a. The split contact intermediate wheel 42 has the same number of teeth as the date counter gear 33 that meshes with the split pinion 32, and keeps the same rotational speed as the split pinion 32 and is synchronized therewith. Reference numeral 43 denotes a split-contact spring fixed to the outer peripheral portion of the engaging portion 41a of the split-contact wheel 41. FIG. 3 shows a top view of the split-contact wheel 41 to which the split-contact spring 43 is fixed. The minute contact spring 43 is a reference spring portion 43.
It is composed of a and a side pressure spring portion 43b. The reference spring portion 43
a is a band on the surface facing the minute contact spring 43 of the alarm reference wheel 45, which is rotatably attached to the body portion 37a of the hour wheel 37, outside the set time of the alarm. The laminated contact plate 46, which is composed of a conductive member 46b and a non-conductive member 46a which are provided around the non-conductive member 46a, is press-connected to the non-conductive member 46a. On the other hand, the side pressure spring portion 43b is the body portion 3 of the hour wheel 37.
The contact with 7a is intended. Here, since the hour wheel 37 serves as an anode via the support surface 47a of the hour wheel 37 of the main plate 47 that is electrically grounded (not shown) to the anode, the split contact spring 41 is also electrically connected. It is the anode. At the time when the alarm is set, the reference spring portion 43a contacts the conductive member 46b having the polarity of the cathode through the notch (not shown) provided in the non-conductive member 46a. By this contact, the anode current serves as an alarm signal and is guided to the reference lead plate 48 which is arranged by an alarm circuit (not shown) and which is always press-fitted to the conductive member 46b. FIG. 4 is a sectional view of an essential part showing an external operation portion of the alarm reference vehicle 45.

The alarm reference wheel 45 meshes with an alarm correction wheel 49 pivotally supported by the boss 47b of the main plate 47, and the alarm correction wheel 49 is engaged with the shaft portion 50a of the winding stem 50 which is an external operation member. The alarm correction transmission wheel 51 is engaged. The winding true 50
By pulling one step further, the corner portion 50b of the winding stem 50 engages with the central corner hole portion 51a of the alarm correction transmission wheel 51, and the alarm time can be corrected. That is, in the state where the winding stem is pulled to the first stage, by rotating the winding stem 50, the alarm reference wheel 45 is rotated and the alarm time can be set. Incidentally, when setting the alarm time, as is well known, the hand is attached so that the alarm signal is sent when the hands of the minute hand 31 and the alarm reference hand 44 coincide with each other. 52 is the alarm reference vehicle 45, the intermediate contact intermediate wheel 42 and the alarm correction vehicle 49
Is a pusher plate for supporting each of them, and is screwed (not shown) to the base plate 47.

[Effect of the Invention] As described above, according to the present invention, it is possible to sandwich and dispose between the hour wheel and the alarm reference wheel, that is, the split contact having a tooth bottom diameter equal to or larger than the body diameter of the hour wheel. The wheel has the same number of teeth and modules as the minute pinion, and the minute contact point wheel meshes with the intermediate contact point intermediate wheel that is integrally formed coaxially with the Hino back wheel, and rotates synchronously at the same rotational speed as the minute pinion. To do. Therefore, there is no need for an intermediate wheel for aligning the rotation directions of the minute pinion wheel and the minute contact wheel, and the minute contact wheel is the same as the conventional pointer wheel train except for the minute contact wheel which is essential in the configuration of the minute alarm wheel train. The alarm wheel train structure has a very simple structure only by adding an intermediate wheel, is particularly suitable for a small timepiece, is advantageous in cost, and has a large practical effect.

[Brief description of drawings]

1 and 4 are sectional views of an essential part of an electronic wrist watch showing an embodiment of the present invention, FIGS. 2 and 3 are plan views of the essential part of FIG. 1, and FIG. 5 is a conventional example. FIG. 6 is a cross-sectional view of the main part of FIG. 6, and FIG. 6 is a plan view of the main part of FIG. 31 ... minute hand, 32 ... minute kana, 35 ... Hino back wheel, 36 ... hour hand, 37 ... cylindrical wheel, 41 ... minute contact wheel, 45 ... alarm reference wheel, 48 ... reference lead plate.

Claims (1)

[Scope of utility model registration request] 1. An hour wheel and minute pin to which an hour hand and a minute hand are attached respectively, a Hino back wheel which constitutes a pointer wheel train meshing with the hour wheel and minute pin, an alarm circuit for alarm and the In an alarm wheel train consisting of an alarm guide wheel electrically connected to a guide lead plate guided from an alarm circuit, and a minute contact wheel arranged between the alarm guide wheel and the hour wheel, The number of teeth or modules of the split contact wheel is equal to that of the split pinion, the root diameter of the split contact wheel is equal to or larger than that of the barrel of the hour wheel, and the split contact wheel is An alarm wheel train structure for an electronic watch characterized by being rotatably engaged with an intermediate wheel intermediate wheel that is coaxially integrated with the back wheel.