JPS6241273Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an improvement of the reference contact mechanism of a watch.

Conventional hour hand wheel in which a reference wheel with a reference hand and an hour wheel with an hour hand are coaxially supported, and which moves in the axial direction by engaging and disengaging a hole provided in the reference wheel and a protrusion provided in the hour hand wheel. A reference contact mechanism in which a driven age spring constitutes a contact terminal and the generation and stop of an alarm sound is controlled by the age spring coming into contact with and separating from a fixed contact is disclosed in, for example, Japanese Utility Model Application Publication No. 51-44365. and is generally widely used.

In this type of indicator contact mechanism, the hour hand wheel moves in the axial direction when the protrusion provided on the hour wheel engages and disengages from the hole provided in the indicator wheel, so the hour hand in the time display section moves back and forth. Therefore, there were also problems from a visual perspective. As an improvement, a gear 1 that meshes with an hour hand gear (not shown) and a gear 2 that meshes with a reference gear (not shown) as shown in FIG. There was one in which the gear 1 was rotatably mounted, and the gear 1 had a projection 1a and the gear 2 had a hole 2a so that they could fit into each other. In this method, the center shaft 3 is press-fitted and fixed to the conductive metal base plate 4, and the base of the age spring 5 is fixed to the metal base plate 4.
Further, a terminal 6 is provided on the metal base plate 4, and a power source and a time alarm are connected in series to the base of the spring 5 and the terminal 6. The standard operation in such a structure is that the gear 1 falls at a set time, and this displacement causes the spring 5 to come into contact with the central shaft 3, closing the electric circuit and signaling the time. However, at present, the simplicity of machining, the good machining accuracy,
Problems arose, such as the fact that it could not be used with base plates made of synthetic resin, which is often used due to its low cost.

The present invention has been made to solve the above problems.

Hereinafter, a detailed explanation will be given based on examples.

In the first embodiment of the present invention, as shown in FIGS. 2, 3, and 4, the hour hand gear 7 is fixed to the hour hand pipe 8, and the hour hand pipe 8 is made of synthetic resin. It is rotatably held on the base plate 11.
The reference gear 9 is fixed to a reference pipe 10, and this reference pipe 10 is rotatably held on a base plate 11. The central shaft 14, whose base is implanted into the base plate 11 by press-fitting or caulking, is itself made of a conductive material, and two gears 12 and 13 are mounted so as to be rotatable. The center shaft 14 also has a ring-shaped projection 1 in the middle of the shaft.
The step 14b has a diameter difference from that of the step 4a.
The gear 12 meshes with the hour hand gear 7, and the ratio of the number of teeth between the two is normally set to 1:1. Further, the gear 12 is formed with one or more protrusions 12a and a chevron 12b on the upper part thereof. Gear 13 is reference gear 9
The ratio of the number of teeth between the two is normally set to 1:1. Further, the gear 13 is formed with a hole 13a into which the protrusion 12a can fit. Agebane 1
5 itself is made of a conductive material, and is fixed to the base plate 11 with screws, etc., and the tip thereof is shaped like a chevron 12b of the gear 12.
This is the gear pressing surface that comes into contact with the top surface of gear 1.
2 in the axial direction. Therefore, the tip of the protrusion 12a of the gear 12 is always in contact with the upper surface of the gear 13. The gear 13 is pivotally supported on the base side of the central shaft 14, and the length of the ring-shaped protrusion 14a and the base plate 11 are set to be longer than the thickness of the gear 13.
Therefore, a space is formed between the gear 13 and the base plate 11. The lead 16 is made of an elastic conductive member such as a metal spring, conductive rubber, or conductive synthetic resin, and is disposed in the space between the gear 13 that meshes with the reference gear 9 and the base plate 11. There is. In the embodiment, the lead 16 is fixed to the base plate 11, and a hole 16b is formed at one end of the lead 16.
The central shaft 14 is press-fitted into contact with b. The other end of this lead 16 is molded to extend outward from the outer diameter of the gears 12 and 13, and a terminal hole 16a is formed at the other end to serve as a connection terminal for a reference notification means consisting of a power source and a timer. has been done. In addition, the power source and the time signal as a reference notification means are connected in series, one end is connected to the age spring 15, and the other end is connected to the lead 16, and when the age spring 15 and the central shaft 14 come into contact, it closes and the time signal is emitted. is starting to occur.

The operation of the guideline structure of the present invention will be described below. First, the reference gear 9 and gear 13 are set at predetermined time positions via a reference turning mechanism (not shown). The clock train (not shown) rotates normally and rotates the hour hand gear 7 at a constant speed, so that the gear 1
2 also rotates at the same speed as the hour hand gear 7. and,
When the estimated set time comes, the protrusion 12a of the gear 12
reaches the position of the hole 13a of the gear 13, and is fitted into this hole 13a by the spring 15. Therefore, the lower surface of the gear 12 moves downward to a position where the upper surface of the ring-shaped stepped portion 14a of the central shaft 14 is located, and the gear pressing surface of the swallowtail spring 15 comes into contact with the upper end of the central shaft 14. As a result, the power source and the time signal are closed as an electric circuit, and current flows through the time signal (generally a bell or buzzer), causing it to ring. Then, as time passes further, the protrusion 12a comes out of the hole 13a,
The gear 12 moves upward against the age spring 15,
The age spring 15 and the central shaft 14 are no longer in contact with each other,
The alarm will stop ringing.

A second embodiment of the present invention will be explained with reference to FIG.

This is because the hole 17a of the lead 17 is formed into a cup shape so that a pressing force acts in the axial direction of the central shaft 14 in order to make the lead 17 more securely in contact with the central shaft 14. In addition, the second embodiment is as follows:
Since the structure is the same as that of the first embodiment except for the lead 17, the same reference numerals are used and the explanation is omitted.

A third embodiment of the present invention will be explained with reference to FIGS. 6 and 7.

This has a concave shape 18a in which the contact portion of the lead 18 with the center shaft 14 is applied in the radial direction of the center shaft 14 in order to ensure more reliable contact with the center shaft 14 of the lead 18. It is. The third embodiment has the same structure as the first embodiment except for the lead 18, so the same reference numerals will be used and the explanation will be omitted.

A fourth embodiment of the present invention will be explained with reference to FIG.

In this case, the contact portion of the center shaft 19 with the lead 20 has a concave shape 19a that has elasticity. In other words, the lead 20 receives an axial pressing force from the central shaft 19. In addition, the fourth
In the embodiment, except for the central axis 19 and the lead 20, the above-mentioned first
Since the structure is the same as that of the embodiment, the same reference numerals are used and the explanation thereof is omitted.

As described above, the present invention has the following features.

1. Because the base plate is molded from a non-conductive synthetic resin,
The base of the movable contact (agespring) that comes into contact with the central shaft contact at appropriate times can be directly fixed to the ground plate without an insulating member.

2. Since the ground plate itself is not used as a conductive part, the contact resistance at the electrical contact point can be set to the best condition without being affected by the finish of the surface of the ground plate.

3. It is possible to use a base plate molded from synthetic resin, which is inexpensive, has good processing accuracy, and is easy to process.

4. By simply inserting the center shaft into the reed and then press-fitting it into the base plate, the center shaft and the reed will surely come into contact, and no special process is required.

5. Since the lead is placed in the space formed between the gear that meshes with the reference gear and the main plate, even if the lead is deformed due to some influence, it will not impose an illegal load on the clock movement of the clock train. I have nothing to give. That is, when the lead is deformed, the wheel train that may come into contact with it is only the gear that meshes with the reference gear, and does not affect the gear that is rotated at a constant speed by the drive source.

6 The other end of the lead extends outward from the outer diameter of both gears that are pivotally supported on the central shaft, and since this other end is used as a connection terminal with the reference notification means, it is necessary to solder to form a conductive path. and pressure welding work can be easily performed without being hindered by the two gears.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main part of the conventional example, Fig. 2 is a sectional view of the main part of the first embodiment of the present invention, Fig. 3 is a sectional view taken along the line A-A, and Fig. 4 is a sectional view taken along the line B-B. , FIG. 5 is a sectional view of the main part of the second embodiment of the present invention. 6 is a sectional view of a main part of a third embodiment of the present invention, FIG. 7 is a sectional view taken along the line C--C, and FIG. 8 is a sectional view of a main part of a fourth embodiment of the present invention. 7... Hour hand gear, 9... Reference gear, 11... Main plate, 12/13... Gear, 14... Center axis, 15
...Agebane, 16...Lead, 17...Lead, 18...Lead, 19...Central axis, 20...
Lead.

Claims (1)

[Scope of claim for utility model registration] 2 meshing with the hour hand gear and indicator gear respectively
Each row of gears is rotatably mounted on a central shaft made of a single conductive member, one gear has a protrusion and the other gear has a hole so that they can fit together, and the central shaft itself Used as one of the standard contacts, and the above 2
In a watch that controls the indicator notification means for opening and closing the indicator contacts by moving one of the gears in the axial direction, the base of the central shaft is fixed to a main plate made of synthetic resin material, and A gear that meshes with the reference gear and a gear that meshes with the hour hand gear are pivotally supported on a central shaft, and one end of a swallowtail spring is fixed to the main plate, and the other end of the swallowtail spring engages around the shaft hole of the gear that meshes with the hour hand gear. The gears are always elastically pressed toward the base plate, and can be brought into contact with and separated from the tip of the center shaft by moving the gear in the axial direction.Furthermore, a space is formed between the gear meshing with the guide gear and the base plate to prevent elasticity. A lead made of a conductive material with heat is placed in the space between the base plate and the gear that meshes with the reference gear, and one end of the lead is pressed against the central axis, and the other end is at least A reference contact mechanism for a timepiece, characterized in that the gears extend outwardly, and the other end thereof is used as a connection terminal with a reference notification means.