JPH0239271Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention mainly relates to interior clocks, and in particular provides a novel clock in which the clock body is indirectly rotated using the rotation of a pointer, etc. as power. It is something.

(Prior art) In the conventional technology, as shown in FIG.
By rotating a pointer, for example, a minute hand 4, which is supported on a fulcrum Q of a stand 2, the main body of the watch is directly rotated with the minute hand 4 as a fixed axis.

However, this type of operation has the disadvantage that the pointer 4 directly drives the watch body 1 to rotate in the direction of the arrow P, resulting in an overload on the pointer, which increases the burden on the movement. .

(Technical Issues) The present invention was developed in view of the shortcomings of the prior art, and it aims to reduce the burden on the movement from the pointer when it uses the rotation of the pointer as a driving force to impart rotational movement to the watch body. The technical challenge is to provide the watch body with small torque and high rotational efficiency.

(Technical Means) In order to solve the above-mentioned technical problem, in the present invention, instead of using the pointer that is directly rotationally driven as the rotation axis of the watch body as in the past, the pointer is driven by the independent rotational movement of the pointer. By converting the power into balance movement using the weight, it is possible to impart large rotational movement to the watch body with small torque without putting any load on the movement itself. As shown in the illustrated embodiment (FIGS. 2 to 4), the configuration is as follows.

Reference numeral 10 denotes a rotating clock tower main body, and the rotating clock tower main body 10 has a stand 11, an arm 12 attached to the stand 11 so as to be rotatable in an eccentric angle, a clock main body 13 attached to one end of the arm 12, and the other end. It consists of a balancer 14 attached to.

15 is a watch body 13 forming a dial surface 15A.
The outer case 15 has a clock movement M housed inside the outer case 15.

16 is the hour hand, 17 is the minute hand, 18 is the second hand,
They are fitted onto pointer shafts 19 that respectively protrude from the clock movement M toward the center of the dial surface 15A. Further, a weight 20 is appropriately attached to the rear end portion of the minute hand, and the minute hand 17 is rotated by the movement drive of the clock movement M.
The center of gravity _G1 of the entire watch body 13 is configured to move as appropriate.

The arm 12 is pivotally supported on a fulcrum shaft 21 fitted to the stand 11.
1 as a rotation axis, the watch body 13 is configured to be rotatable in an eccentric angle, and the balance conditions between the watch body 13 and the balancer 14 are as follows.

That is, as shown in FIG. 3, the outer case 15, the hour hand 16, the minute hand 17, which constitute the pointer relationship,
The watch body 13, excluding the second hand 18 and weight 20, is balanced left and right around the balancer 14 and the Y-axis, and the minute hand 17, which has a weight 20, is always in a vertical position and left and right with the fulcrum shaft rod 21 as the base point. It is designed to maintain a balance between

In this case, the force applied by the weight 20 is made larger than the balance change caused by the hour hand 16 and the second hand 18.

Therefore, as the minute hand 17 with the weight 20 rotates, the center of gravity G ₁ of the watch body 13 moves, so that the center of gravity G1 of the watch body 13 moves through the arm 12.
3 and the balancer 14 with respect to the fulcrum shaft 21 as a reference point, the arm 12 is rotated at an angular angle about the fulcrum shaft 21 as the rotation axis, and the minute hand 17 is always in the vertical direction. That direction will be maintained. Next, the left-right balance relationship using the fulcrum shaft rod 21 as a reference point is as follows.

As shown in FIG. 3, when the arm 12 is located on the horizontal X-ray axis (zero inclination) and the minute hand 17 with the weight 20 faces vertically, the direction of the minute hand 17 makes an angle of 90 degrees with the X-ray axis. The weight acting on the center of gravity G ₁ of the watch body 13 including the hands is M ₁ g,
The distance between the center of gravity G ₁ and the fulcrum shaft rod 21 is L ₁ ,
Assuming that the weight M ₂ g acting on the center of gravity G ₂ of the balancer 14 is L 2 and the distance between the center of gravity G ₂ and the fulcrum shaft 21 is L ₂ , the left-right balance relationship with the fulcrum shaft 21 as the reference point is as follows: M ₁ g・L ₁ = M ₂ g・L ₂ .

(effect) The above technical means works as follows.

First, the arm 12 is positioned on the horizontal X-ray axis, and the weight 20 of the minute hand 17 is positioned vertically downward on the horizontal X-ray axis.
When making an angle of 90° with the shaft, the watch body 13 and balancer 14 are in a state of left-right balance with the fulcrum shaft rod 21 as a reference point, and at this time the watch body 12
No rotational force is generated.

Next, as shown in FIG. 4, when the minute hand with the weight 20 is rotated in the direction of arrow A by the movement drive of the timepiece movement M, the timepiece body 13
The center of gravity G ₁ of is moved by a distance ΔL ₁ in the direction of the left arrow D.

In this case, the center of gravity of movement from the fulcrum shaft rod 21
The distance to G ₁ is L ₁ +△L ₁ , and the arm 1
_{If the inclination from the} horizontal Working in the direction of mark B, the balancer floats and rotates counterclockwise, and the arm 12 rotates about the fulcrum shaft rod 21 as the rotation axis.

Therefore, as the minute hand 17 of the timepiece body 13 rotates, the timepiece body 13 continues to rotate around the fulcrum shaft 21 while maintaining balance in synchronization with the minute hand speed.

(Effects) The present invention has the following unique effects.

In particular, the movement of the center of gravity _G1 of the watch body 13 caused by the rotational movement of the minute hand 17 with the weight 20 allows the watch body 13 to rotate while maintaining left and right balance, resulting in a large rotational movement with a small torque. In addition, since the clock body independently revolves around the fulcrum shaft rod 21 as the center of rotation, it has great effects such as being able to be used in a wide range of interior clocks and the like.

[Brief explanation of the drawing]

FIG. 1 is an overall front view of a watch body showing the prior art. Figures 2 to 4 show an embodiment of the present invention, Figure 2 is a perspective view of the entire rotating clock tower body, and Figures 3 to 4 explain the principle of rotation of the clock body. It is a mechanism diagram. 13: Watch body, 14: Balancer, 17: Minute hand, 20: Weight, 21: Fulcrum shaft rod, 18: Arm.

Claims (1)

[Scope of utility model registration request] A minute hand 17 having a weight 20 on a part thereof is attached to a watch body 13, and the watch body 13 is attached to one end of the arm 12, and a balancer 1 is attached to the other end.
4 and attach the arm 12 to the fulcrum shaft rod 21.
A timepiece in which a timepiece main body 13 rotates around a fulcrum shaft rod 21 as the minute hand 17 rotates by being pivotally supported so as to be rotatable at an eccentric angle.