JPH08179057A - Pendulum clock - Google Patents

Abstract

PURPOSE: To easily fit a pendulum to a clock frame with a simple structure. CONSTITUTION: A rear frame 4 is provided with a nearly V-shaped support projection 6a serving as a fulcrum S, and a pendulum 5 is provided with a reception section 8b having a nearly V-shaped receiving groove 8a supported by the support projection 6a. A cylinder section 5a centering on the fulcrum S is provided around the reception section 8b. Guide walls 4a with inner walls having the diameter slightly larger than the outer diameter of the cylinder section 5a are protruded on the rear frame 4 on both sides of the support projection 6a. The pendulum 5 is rockably fitted to the rear frame 4, and it is driven via an electromagnetic driving device K.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pendulum clock.

[0002]

2. Description of the Related Art Conventionally, in a pendulum timepiece in which a pendulum is incorporated in a timepiece frame, the tip of an edge serving as a fulcrum of the pendulum strongly collides with a receiving portion and is crushed due to vibration, impact, or the like generated during transportation of the timepiece. To prevent this, shock absorbers are attached to the pendulum of the watch and the individual packaging box of the watch. For this reason, in the case where the pendulum is incorporated in the timepiece frame, it takes time and labor to attach the cushioning material to the pendulum of the timepiece and the individual packaging box of the timepiece, resulting in extra cost. Therefore, there is a device in which the timepiece frame and the pendulum are separated and the user himself / herself attaches the pendulum to the timepiece frame to reduce the cost.

[0003]

However, in the second prior art in which the user himself / herself attaches the pendulum to the timepiece frame, the attachment of the pendulum is facilitated only by providing the bearing portion on the timepiece frame. There is a problem that it is difficult to attach the pendulum to the timepiece frame because no means such as a guide is provided.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pendulum timepiece having a simple structure so that the pendulum can be easily attached to the timepiece frame.

[0005]

In order to achieve the above object, the pendulum timepiece according to the present invention is a pendulum timepiece in which a pendulum driven by an electromagnetic drive device is swingably mounted on a timepiece frame. The watch frame is provided with a substantially V-shaped supporting protrusion serving as a fulcrum, and the pendulum is provided with a receiving portion having a substantially V-shaped receiving groove supported by the supporting protrusion. A cylindrical portion centering on a fulcrum is projected around the portion, and guide walls having inner walls having a diameter slightly larger than the outer diameter of the cylindrical portion are projected on both sides of the support projection on the timepiece frame. The guide wall preferably projects rearward from the rear end surface of the support protrusion. Engage with the support protrusion on the receiving part,
An engagement portion may be provided to prevent the pendulum from being disengaged in the axial direction.

[0006]

An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a dial 2 is provided on the front surface of the front frame 1, and a front cover C is provided in front of this dial. In the space between the front cover C and the dial 2, a pointer 3 including an hour hand and a minute hand is projected from the timepiece mechanical body (not shown) fixed to the back surface of the dial 2 through the dial 2 to the front. It is attached to a shaft (not shown).

As shown in FIGS. 2 to 4, a rear frame (clock frame) 4 is fixed to the rear surface of the front frame 1 with screws (not shown), and an electromagnetic drive device described later is mounted on the rear surface of the rear frame 4. A pendulum 5 which is driven via the pendulum is swingably mounted. Pendulum 5
Is located above the front frame 1, and the swinging motion of the pendulum 5 can be visually recognized from the front of the front frame 1. A lower bearing 6 is fixed to the center of the rear surface of the rear frame 4 with a screw 7, and the lower bearing 6 has a substantially V-shaped support projection 6a for swinging the pendulum 5 with the front end serving as a fulcrum S. Is protruding with the top facing up. An upper bearing 8 is fixed to the pendulum 5 at a substantially central position by a screw 9, and the upper bearing 8 has a substantially V-shaped receiving groove 8a (see FIG. 3) supported by a supporting protrusion 6a. A receiving portion 8b is provided. The receiving portion 8b is provided with a locking portion 8b1 (see FIG. 2), and the locking portion 8b1 engages with both end surfaces of the support protrusion 6a to prevent the pendulum 5 from coming off in the axial direction. . On the back surface of the pendulum 5, a cylindrical portion 5a centering on the fulcrum S is provided around the receiving portion 8b, and the supporting portion 6a of the rear frame 4 is supported by the receiving portion of the pendulum 5 by grasping the cylindrical portion with a finger. 8b can be attached.

On the rear frame 4, a pair of guide walls 4a having inner walls having a diameter slightly larger than the outer diameter of the cylindrical portion 5a are provided on both sides of the support protrusion 6a. The guide wall 4a projects rearward from the rear end surface 6a1 of the support protrusion 6a. Therefore, even if the rear frame 4 is accidentally bumped into something hard when the timepiece is transported with the pendulum 5 removed, the support protrusion 6a is protected by the guide wall 4a, and the pendulum 5 is protected.
The tip of the edge serving as the fulcrum S of is not crushed. A permanent magnet 10 is fixed below the front of the pendulum 5, and the front side of the rear frame 4 in front of the position where the pendulum 5 is stationary (the neutral position) has a thin plate thickness. A coil 11 mounted on an electronic circuit (not shown) is provided, and the permanent magnet 10 and the coil 11 form an electromagnetic drive device K.

The pendulum 5 is normally removed from the rear frame 4 during transportation. In order to attach the pendulum 5 to the rear frame 4, the outer diameter of the cylindrical portion 5a is grasped and the outer diameter of the cylindrical portion 5a and the pair of guide walls 4 are provided between the pair of guide walls 4a of the rear frame 4.
When the pendulum 5 is mounted so that the centers thereof are aligned with each other, the pendulum 5 can be easily attached to the rear frame 4.

Although the rear frame and the lower bearing are separated and the pendulum and the upper bearing are separated in this embodiment, the present invention is not limited to this, and the rear frame and the lower bearing are integrally formed. Needless to say, the pendulum and the upper bearing may be integrated and the pendulum may be provided with the receiving portion as well as the supporting protrusion provided on the.

A pendulum driven via an electromagnetic drive supplies the drive with drive energy which is generally greater than the friction loss at the fulcrum. Therefore, in order to prevent the swing width of the pendulum from increasing with the passage of time so as to obtain a predetermined swing width, the contact portion is provided and the pendulum is brought into contact with this contact portion. Since the guide wall 4a of this embodiment can also serve as the contact portion of the pendulum, it is not necessary to newly provide the contact portion on the rear frame.

[0012]

As described above, according to the present invention, the watch frame is provided with the substantially V-shaped supporting protrusions serving as a fulcrum, and the pendulum is provided with the receiving portion having the substantially V-shaped receiving groove supported by the supporting protrusions.
Moreover, since the cylindrical portion centering around the fulcrum is projected around the receiving portion, and the guide wall having the inner wall having a diameter slightly larger than the outer diameter of the cylindrical portion is projected on both sides of the support projection on the timepiece frame. , The pendulum can be easily attached to the watch frame.

If the guide wall is made to project rearward from the rear end surface of the support protrusion, even if the rear frame is accidentally bumped against something hard when the timepiece is transported with the pendulum removed, Since it protects the support protrusions by hitting the wall, the tip of the edge that serves as the fulcrum of the pendulum does not collapse.

If the receiving portion is provided with the engaging portion that engages with the support projection and prevents the pendulum from coming off in the axial direction, the pendulum does not come off in the axial direction during the swing drive.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a main part of FIG.

3 is a partially cutaway rear view of FIG. 1. FIG.

FIG. 4 is a vertical sectional view of a main part of a rear frame.

[Explanation of symbols]

 4 Rear frame (clock frame) 4a Guide wall 5 Pendulum 5a Cylindrical part 6a Supporting protrusion 6a1 Rear end face 8a Receiving groove 8b Receiving part 8b1 Locking part S Support point K Electromagnetic drive device

Claims (3)

[Claims] 1. A pendulum timepiece in which a pendulum driven via an electromagnetic drive device is swingably mounted on a timepiece frame, wherein the timepiece frame has a substantially V-shaped supporting protrusion serving as a fulcrum. Is provided, and the pendulum has a substantially
A receiving portion having a V-shaped receiving groove is provided, and a cylindrical portion centering on the fulcrum is provided around the receiving portion, and the timepiece frame is provided on both sides of the support protrusion with A pendulum timepiece characterized in that a guide wall having an inner wall having a diameter slightly larger than the outer diameter of the cylindrical portion is provided in a protruding manner. 2. The pendulum timepiece according to claim 1, wherein the guide wall projects rearward from a rear end surface of the support protrusion. 3. The receiving portion according to claim 1 or 2, wherein the receiving portion is provided with an engaging portion that engages with the support protrusion and prevents the pendulum from being disengaged in the axial direction. Pendulum clock.