JPS6231902Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a table clock whose main body tilts from side to side like a pendulum, giving it a dynamic feel.

As illustrated in FIG. 1, a table clock in which a support shaft 1 is formed horizontally at the tip of one arm of a standing doll A, and a clock body B is supported on the upper surface of the support shaft 1 so as to be tiltable left and right. is generally known. In other words, in the case of this type of clock, which is well known as a mainspring type, a weight is fixed to an escape (escape) that engages with a ratchet wheel (also called an escape wheel) inside the clock body B so that it swings in a pendulum shape. Even if the entire watch body B tilts from side to side, the weight inside the watch body B hangs straight down due to gravity, so as the watch body B tilts, the ratchet wheel rotates one pitch at a time, rotating the pointer on the front dial. In addition to displaying the time, the weight moves within the watch body B so that the entire watch body B continues to tilt. In that case, the time is "late"
The adjustment of "advance" and "advance" is performed by adjusting the length of the pendulum 2. However, spring-type clocks generally have the drawbacks of having to be wound frequently and having poor time accuracy, so this type of table clock has also come to have a built-in battery-powered clock such as a transistor oscillation circuit or crystal oscillation type. . That is, a battery clock is installed inside the casing of the watch body B, and the hands on the front dial are rotated by a stepping motor or the like to accurately display the time. A ratchet wheel provided in the watch is rotated, and a pendulum-like weight is attached to the escaper engaged with the ratchet wheel, so that the movement of the weight causes the watch body B to continuously tilt from side to side.

However, in the above-mentioned table clock with a built-in battery clock whose main body can be tilted from side to side, the rotation period of the battery clock such as a stepping motor does not necessarily match the horizontal tilt period of the main body. That is, the rotation period of a battery-powered watch is uniformly determined by the oscillation frequency of a crystal oscillator, etc., but the tilting period of the watch body is related to the length of the pendulum 2, etc., so the two do not match. For this reason, the rotational torque of the battery clock is transmitted to the ratchet wheel through a kind of friction clutch, but due to poor friction, only the tilting movement of the clock itself stops, or the hands stop at the same time. Such failures occurred frequently.

The present invention aims to solve the above-mentioned drawbacks, and the friction clutch fixes the spiral center of a coil spring made of an elastic wire wound in a conical shape to the drive shaft on the battery watch side, and also fixes the periphery of the coil spring. is configured to elastically slide into contact with the inner bottom surface and inner peripheral surface of the bottomed cylinder on the ratchet side, and transmit rotation from the transmission shaft to the coil spring in a direction that increases the degree of winding of the coil spring. be.

An embodiment of the present invention will be described below with reference to the drawings.

First, each part of the battery watch housed in the casing 3 of the watch body B will be explained. 4 is a battery, 5 is a circuit board incorporating a crystal oscillator, an integrated circuit, etc., and 6 is a battery watch.
is an electromagnetic coil excited by the signal, and 7 is a rotor. Since the electric circuits of these stepping motors are well known, a detailed explanation will be omitted. The rotor 7 rotates from the pinion 8 to the rotation axis 10 of the second hand 9.
The signal is transmitted to the gear 11 fixed to the . Further, a gear 13 meshes with a pinion 12 that is integrally fixed to the rotation shaft 10 with a gear 11, and a pinion 14 that is integral with the gear 13 is connected to a gear 17 that is arranged concentrically with the rotation shaft 16 of the long hand 15. It meshes with the Further, a pinion 18 fixed to the rotating shaft 16 meshes with a gear 19, and a pinion 2 rotates integrally with the gear 19.
0 meshes with a gear 23 fixed to the rotating shaft 22 of the hour hand 21. Therefore, when the second hand 9 rotates due to the rotational drive of the stepping motor, the long hand 15 and the short hand 16 rotate at a fixed ratio, and the time can be displayed on the front dial 24 by these hands. 25
is a transparent glass front. 26 is a knob shaft for setting the time, and a pinion 27 at the tip thereof is connected to the gear 19.
It meshes with the The structure of each part of these battery clocks is the same as that of ordinary known table clocks.

However, behind the battery-powered watch, the following mechanism is provided in order to continuously tilt the entire watch body B left and right by rotationally driving the battery-powered watch. That is, 28 is a transmission shaft to which a pinion 29 that meshes with the gear 11 is fixed, 30 is a pinion that is fixed to the transmission shaft, 3 is a gear that meshes with the pinion 30, and the gear 31 is parallel to the transmission shaft 28. It is fixed to a supported transmission shaft 32, and when the stepping motor rotates, the gear 11 and pinions 29, 30 are
The gear 31 is caused to rotate intermittently at a constant speed through a small angle in the direction of the arrow shown in the figure. (See Figures 5 and 6). Reference numeral 33 denotes a bottomed cylinder rotatably supported on the transmission shaft 32 so as to face one side of the gear 31, and meshing teeth 3 are provided on the outer periphery of the cylindrical body.
4 is engraved. And 35 is this gear 31
The coil spring is arranged between the bottomed cylindrical body 33 and is made by winding a narrow band-shaped elastic wire in a conical shape, and the coil spring is fixed to the base of the gear 31 by fixing the spiral center to the base of the gear 31. The coil spring 35 is concentrically fixed to the power transmission shaft 32 on the side of the battery watch, and the peripheral edge of the coil spring 35 is elastically slid into contact with the inner bottom surface and the inner circumferential surface of the bottomed cylinder 33. Reference numeral 36 denotes a ratchet wheel; 37 denotes an escape having a pair of engagement pins 38, 38 alternately engaged with the outer periphery of the ratchet wheel; 40 is a hook-shaped mounting piece 4 attached to the escape 37 via the support shaft 39.
1' is a weight attached in a pendulum shape.
And a pinion 41 provided integrally with the ratchet wheel 36
are meshed with the meshing teeth 34. A planar cross-shaped support piece 43 is rotatably supported by a pin 44 on a support frame 42 extending below the casing 3, and a pair of supporting pins 45 protrude from the lower surface of both ends of the support piece. The tips abut on jewel bearings 46 provided at intervals on the support shaft 1, supporting the entire watch body B so as to be tiltable left and right.

In the table clock configured in this way, the time is displayed with high accuracy on the surface dial 24 by the battery clock in the casing 3 which uses the battery 4 as an energy source, and the rotation of the battery clock is driven by the transmission shaft 32. is transmitted to rotate the coil spring 35. That is, since the transmission shaft 32 rotates the coil spring 35 in a direction that increases its winding degree, the rotational torque of the transmission shaft 32 is accumulated in the coil spring 35. Since the peripheral edge 35' of the coil spring 35 is in sliding contact with the inner bottom surface and the inner peripheral surface of the bottomed cylinder 33, the rotational torque is transmitted to the bottomed cylinder 33, and the rotational torque is transmitted to the meshing teeth 34. , the ratchet wheel 3 via the pinion 41
6, and rotational torque in the direction indicated by the arrow is always transmitted to the ratchet wheel 36 from the coil spring 35. Therefore, if the entire watch body B is tilted left and right, the engagement pins 38, 38 of the escape 37 are alternately engaged with the ratchet wheel 36 by utilizing the property that the weight 40 hangs vertically. 36 rotates intermittently per pitch. Then, due to the movement of the center of gravity of the weight 40 within the casing at that time, the left and right tilting movement of the watch body B continues.

In that case, the rotation period of the battery clock, that is, the transmission shaft 32
The rotational speed of the clock body B and the rotational speed of the bottomed cylindrical body 33 do not necessarily match, and the rotational torque of the transmission shaft 32 is accumulated in the coil spring 35. However, the coil spring 35 is made of an elastic wire. is wound into a conical shape, and its peripheral edge 35' is connected to a bottomed cylindrical body 33.
Since the coil spring 35 is in elastic sliding contact with the inner bottom surface and inner circumferential surface of the coil spring 35, when rotational torque accumulates, the coil spring 35
As the outer diameter of the periphery of the coil spring 35 becomes smaller, the frictional resistance with the inner circumferential surface of the bottomed cylinder 33 naturally disappears, causing slippage and no longer transmitting rotation. It is possible to maintain a state in which rotational torque of a constant strength is accumulated. Therefore, sufficient rotational torque to move the weight 40 can be transmitted to the ratchet wheel 36, and no unnecessary load is applied to the stepping motor constituting the battery clock due to the action of the slip.

As explained above with respect to the embodiments, the battery-operated table clock according to the present invention, in which the entire clock body tilts from side to side, has the peripheral edge of the coil spring in elastic sliding contact with the inner and outer circumferential surfaces of the bottomed cylindrical body. Since rotation is transmitted from the transmission shaft on the battery watch side to the coil spring in a direction that increases the degree of winding of the coil spring, an appropriate rotational torque is always transmitted to the ratchet wheel, and no excessive torque is applied to the battery watch side. Since no load is applied, it is possible to provide accurate positioning with less failure and rich in dynamic taste.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view showing an example of a table clock in which the entire clock body tilts, Fig. 2 is a longitudinal sectional view showing the internal structure of the clock main body of the table clock according to the present invention, and Fig. 3
The figure is a cross-sectional view taken along the line - in Figure 2, and Figure 4 is a cross-sectional view of Figure 2.
FIG. 5 is a perspective view of the main parts, and FIG. 6 is a longitudinal sectional view showing the state in which the coil spring is attached. B... Watch body, 1... Support shaft, 3... Casing, 4... Battery, 5... Circuit board, 6... Electromagnetic coil, 7... Rotor, 9... Second hand, 15... Minute hand, 16 ...Hour hand, 24...Front dial, 32...
...Transmission shaft, 33...Bottomed cylinder, 35...Coil spring, 36...Rawl wheel, 37...Escape, 40...
...Weight.

Claims (1)

[Scope of utility model registration request] A watch body is supported on a support shaft so as to be tiltable from side to side, and a battery clock is provided inside the casing of the watch body, and its rotational drive rotates the pointer on the front dial, and at the same time, the rotation of the battery clock rotates the casing. A ratchet wheel provided inside the clock is rotated, and a weight is attached in a pendulum shape to the escaper engaged with the ratchet wheel, so that the movement of the center of gravity of the weight causes the main body of the watch to continuously tilt from side to side. When transmitting the rotational torque of a battery-powered watch to a ratchet wheel, the center of the spiral of a coil spring made of a conically wound elastic wire is fixed concentrically to the transmission shaft on the side of the battery-powered watch, and the peripheral edge of the coil spring is is in elastic sliding contact with the inner bottom surface and inner peripheral surface of the bottomed cylinder on the ratchet side, so that rotation is transmitted from the transmission shaft to the coil spring in a direction that increases the degree of winding of the coil spring. A table clock.