JPH0637357Y2 - Decorative body clock safety device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a stage movement stopping mechanism in a decorative timepiece.

[Prior Art] In recent years, the music is played according to the time signal such as the hour, and the stage, which is a movable member incorporated in the timepiece main body, is lowered, and the doll attached to the movable member is operated to draw attention of the viewer. Decorative body clock to be attached (for example, 1-70.188
No.) has come to be used.

In such a decorative body timepiece, as shown in FIG. 6, usually, a guide rail 25 is provided on the back surface 21 of the timepiece body 10, and a slider 36 is provided on a back plate 35 of a movable stage 31 as a movable member. By moving 36 along the guide rail 25, the movable stage 31 can be moved only in the vertical direction at a predetermined position without shaking, and the back plate of the movable stage 31 can be moved.
The wire 45 whose tip is fixed to 35 is moved up and down by winding up or sending it out to a pulley 43 which is rotated by a drive motor 41 via a worm gear 42, and is moved to a predetermined position of the back plate 21 in the timepiece body 10. An upper limit detection switch 63 such as a limit switch and a lower limit detection switch 65 are provided to detect the stop position of the movable stage 31, and thus the rotation of the drive motor 41 is stopped.

It should be noted that the drive motor 41 and the pulley 43 are incorporated in the rear of the front plate 12 of the timepiece body 10 to which the movement 15, the pointer 17, the dial 13 and the like are attached, so that they cannot be seen from the front of the timepiece body 10. Not even.

By the way, in a decorative body timepiece that incorporates a movable stage 31 as a movable member that moves up and down in a timepiece body 10 such as a wall clock, attention of the viewer is required for the movement of a decorative body such as a doll 37 attached to the movable stage 31 today. In order to attract more, complicated movement is required, the drive mechanism of the ornamental body becomes complicated and the weight increases, and the movable stage 31 may be incorporated in a relatively large wall clock, and the weight of the movable stage 31 is several. kg
As a result, the drive motor 41 having a large rotational torque has come to be used.

[Problems to be Solved by the Invention] As described above, since a motor having a strong rotational torque is used as a drive motor for moving the movable stage, it is interposed between the movable stage and the lower end of the timepiece main body when the movable stage is moved up and down. If a foreign object is caught or the upper limit detection switch fails, a large force is applied to the movable member and the lower end of the watch body when the movable member, which is the movable stage, continues to be lifted by the drive motor, and the movable member and the watch body are damaged. There was a risk of damage.

Except for such a fear, the present invention immediately stops the winding of the wire by the drive motor when an unexpected load is applied when the movable stage is raised.

[Means for Solving the Problem] The present invention is a decorative timepiece having a movable stage that moves up and down along a guide rail and has a movement range defined by an upper limit detection switch and a lower limit detection switch. Then, the tip of the wire is fixed to the movable stage via a coil spring, and when the coil spring is extended by a load, a detection switch that detects the extension of the coil spring and opens a contact is attached to the movable stage,
The detection switch is connected in series with the drive motor.

[Operation] In the present invention, the movable stage is hung on the wire via the coil spring provided at the tip of the wire, and the movable stage, which is the movable member, is vertically moved by the wire via the coil spring. Will grow.

Furthermore, because the detection switch that opens the contact when the coil spring expands is arranged in series with the drive motor, when the coil spring expands due to an increase in the load, the contact of the detection switch opens, and the power supply to the drive motor is cut off. Stop climbing.

[Example] An example of the safety device for a decorative timepiece according to the present invention is as follows.
As shown in FIG. 1 etc., the movable stage 31 as a movable member.
Is detected to stop the operation of the drive motor 41.

As shown in FIGS. 1 and 2, in this ornamental timepiece, the lower part of the timepiece main body 10 in which the dial 13 and the pointer 17 are provided on the front plate 12 is the movable stage 31, and as shown in FIG. In addition, the movable stage 31 which is usually a movable member is raised so that only the dial 13 attracts attention in front of the watch body 10.
The movable stage 31 descends as the time signal is played, and the doll 37 and other ornaments 38 placed on the pedestals 33 provided on the left and right of the movable stage 31 appear as shown in FIG. The doll 37 or the like is operated by a motor or the like incorporated in the base 33.

As shown in FIG. 1, the movable stage 31 is a slider that is perpendicular to the central back surface of the back plate 35 of the movable stage 31.
36 is fixed, a guide rail 25 that engages with the slider 36 is vertically provided on the front surface of the back plate 21 of the timepiece body 10, and the slider 36 is provided on the movable stage 31 by moving up and down along the guide rail 25. The structure is such that the movable stage 31 can be moved up and down without shifting the horizontal position of the base 33, the magnet 61 is attached to the back surface of the back plate 35 of the movable stage 31, and the proximity switch is set as the upper limit detection switch on the front surface of the rear surface 21 of the watch body.
When the movable stage 31 is lowered to a predetermined position by attaching it as a lower limit detection switch 65 and a lower limit detection switch 65, a magnet is used as a lower limit detection switch 65 as a proximity switch.
61, a structure in which the movable stage 31 is stopped from descending, and a proximity switch as an upper limit detection switch 63 provided above detects that the movable stage 31 has risen to a predetermined position and stops the movable stage 31 from rising. I am trying.

The drive mechanism of the movable stage 31 is a wire 45 driven by a drive motor 41 attached to the back surface of the back plate 21 of the timepiece body 10.
This drive motor
Reference numeral 41 denotes a motor having a brake mechanism.When the drive motor 41 is not energized, a motor having a structure for applying a braking force to the rotating shaft to prevent the rotating shaft from rotating due to an external force is used. One end of the wire 45 is fixed to the pulley 43 attached to the rotating shaft of the motor 41, and the wire 45
The other end is fixed to the back plate 35 of the movable stage 31 so as to be arranged in parallel with the guide rail 25 via the guide pulley 29.

In fixing the end portion of the wire 45 to the back plate 35 of the movable stage 31, in this embodiment, the movable stage 31 is hung by the wire 45 via the coil spring 47, as shown in FIGS. 1 and 4. , The end of the wire 45 is coupled to one end of the coil spring 47, the other end of the coil spring 47 is engaged and fixed to a support pin 49 attached to the back plate 35 of the movable stage 31, and the coil spring
A fixing member 51 called a dog is attached to the wire 45 so as to be located near 47.

The fixing metal fitting 51 is a metal fitting that can be moved up and down along the wire 45 by loosening the screw 52, and can be fixed at a predetermined position of the wire 45 by tightening the screw 52 after positioning. The actuator 56 of the micro switch attached as the detection switch 55 to the back plate 35 of the movable stage 31 by the fixing metal fitting 51 is slightly pushed down, the contact of the micro switch which is the detection switch 55 is closed, and the detection switch 55 is always in the ON state. The position of the fixing bracket 51 is determined so that

The detection switch 55 is mechanically a movable stage.
Although it is attached to the back plate 35 of 31, the circuit is connected to the motor in series with the drive motor 41, and an annular portion is formed in the actuator 56 of the detection switch 55, and the annular portion is formed in the annular portion. Prevent the wire 45 from coming off the actuator 56 by passing the wire 45 through it, so that the fixing metal fitting 51 is always kept in contact with the actuator 56 so that the fixing metal fitting 51 does not accidentally come off from the actuator 56. .

Since the ornamental timepiece according to this embodiment is provided with the drive motor 41 on the back surface of the back plate 21 of the timepiece body 10, it is mounted to cover the drive motor 41 and attach the timepiece body 10 to a wall or the like. A plate 19 is provided behind the back plate 21.

Further, as shown in FIG. 5, the coil spring 47 has a spring constant of 1.6 kg / mm and uses a coil spring 47 which does not deform under a load of about 4.5 kg or less. When the coil spring 47 extends by about 2 mm, the actuator 56 moves upward due to the extension of the coil spring 47 to open the contact of the micro switch, and the micro switch as the detection switch 55 is attached at a position where it is turned off.

This coil spring 47 may use an appropriate spring constant, but in the present embodiment, when the decorative body 38 such as the doll 37 is attached to the movable stage 31, the total weight of the movable stage 31 is 3 kg.
Since it becomes a remainder, the coil spring 47 extends at the time of starting or stopping the movement of the movable stage 31 in the vertical movement, so that the movable stage
The spring constant is selected so that the coil spring 47 does not expand under a load up to about 1.5 times that of the movable stage 31 so that the 31 does not vibrate vertically.

Then, the load for stopping the drive motor 41 can be determined by the spring constant and the mounting position of the fixing bracket 51 to the wire 45. In this embodiment, the load on the movable stage 31 is about 4 k.
g When an excessive external force is applied, the coil spring 47 extends about 2 mm, the fixing bracket 51 attached to the wire 45 rises by 2 mm, the detection switch 55 is turned off, and the drive motor 41 is de-energized. ing.

As described above, in the present embodiment, the detection switch 55 is always turned on, and when the unexpected load is applied, the detection switch 55 is turned off to cut off the power supply to the drive motor 41. As compared to a configuration in which the stop circuit is activated as a state, the circuit configuration can be simplified, and it is possible to eliminate the possibility that the detection mechanism is in a state where an abnormality cannot be detected in an emergency. If a load larger than a predetermined value is applied when rising, the drive motor
The rotation of 41 can be stopped to immediately stop the rise of the movable member.

[Advantage of the Invention] In the present invention, since the movable stage, which is a movable member, is suspended by the coil spring attached to the end of the wire, when an external force is applied to the movable stage, the coil spring is stretched, and this stretching normally causes This is a safety device for a decorative timepiece that stops the drive motor by turning off the detection switch that has been turned on.Therefore, if something is caught between the lower end of the watch body and the movable stage, or if the movable stage is the lower end of the watch body. Safety device for a decorative timepiece that can immediately and surely stop the rise of the movable stage by the drive motor when an unexpected external force is applied to the movable stage such as when the upper limit detection switch does not operate even when the movable stage is touched. Therefore, even if an abnormality occurs in the detection switch of this safety device, it is possible to prevent the drive motor from being driven to improve safety. It is a safety device.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a decorative timepiece having a safety device according to the present invention with a movable stage lowered, and FIG. 2 is a front view of the decorative timepiece showing the movable stage lowered, FIG. 3 is a front view of the ornamental timepiece showing a state in which the movable stage is housed, FIG. 4 is a view showing a main part of the safety device according to the present invention, and FIG. 5 is an extension of the coil spring used in the safety device. FIG. 6 is a graph showing a vertical sectional side view of a decorative timepiece that does not use the safety device according to the present invention. 10 = watch body, 13 = dial, 15 = movement, 17 = pointer, 21 = back plate, 25 = guide rail, 31 = movable stage,
35 = movable stage back plate, 36 = slider, 38 = decorative body, 41
= Drive motor, 43 = Pulley, 45 = Wire, 47 = Coil spring, 49 = Support pin, 51 = Fixing bracket, 55 = Detection switch,
56 = actuator, 61 = magnet, 63 = upper limit detection switch, 65 = lower limit detection switch.

Claims (1)

[Scope of utility model registration request] 1. A movable stage having a movable stage that moves up and down along a guide rail, and an upper limit detection switch and a lower limit detection switch that detect the position of the movable stage to determine the stop position of the movable stage. A safety device provided in a decorative body timepiece that defines a movement range of, a coil spring is provided at a tip of a wire for moving the movable stage up and down, and a fixing metal fitting is provided on a wire near the coil spring, A structure in which the movable stage is suspended by a coil spring is further provided, and a detection switch fixed to the movable stage and connected in series to a drive motor is provided. Turn on the detection switch,
A safety device for a decorative timepiece having a structure in which when the coil spring is extended by an external force, the pressing force applied to the detection switch by the fixing bracket is released and the detection switch is turned off.