JP3645527B2 - Assist device for lifting equipment for hanging stage for stage production - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an assist device for a lifting device for a stage effect hanging object.
[0002]
[Prior art]
For the stage of a theater, a hall or the like, a so-called stage production hanging material such as a background panel, a curtain, or a large tool is used. Such a suspended object needs to be raised and lowered every time the scene of the stage changes, and for this reason, a suspended object lifting apparatus is used.
[0003]
[Problems to be solved by the invention]
Lifting devices for hanging objects are roughly classified into manual type and electric type. In the manual type, an operator lifts and lowers a suspended object by manually operating a rope at a corner of the stage. The manual type has the advantage that the speed can be subtly changed at an appropriate timing according to the demands of the director and the movement of the performers, but it has the disadvantage of requiring a lot of labor due to human power. . For this reason, it has been attempted to reduce the labor of the operator by providing a suspended counterweight.
[0004]
However, the weights of the suspended loads vary, and those that are heavy are over 100 kg. It is cumbersome to change the counterweight according to the weight of the suspended object. It is in the fact that it is manually operated with effort.
[0005]
On the other hand, the electric type has the advantage of eliminating the need for human power, but it is difficult to realize subtle movements. In addition, in order to realize movements that match the stage production, a computer and complex computer software are required, which greatly increases Cost.
[0006]
Then, an object of this invention is to provide the assist apparatus of the raising / lowering apparatus of the hanging for stage effects which can implement | achieve each advantage of a manual type and an electric type. More specifically, the present invention provides an assist device for lifting equipment for stage effects, which can realize the advantages of both manual and electric by adding to the existing lifting equipment for manual suspension as a retrofit. For the purpose.
[0007]
[Means for Solving the Problems]
The present invention includes a string-like body that suspends a suspended object at one end, a first pulley on which the string-like body is adjusted, a counterweight attached to the other end of the string-like body, and a second pulley A manually operated string that is tuned to the second pulley and has one end attached to the counterweight and manually operating the other end to raise and lower the counterweight to raise and lower the suspended object. An assisting device attached to a lifting device for stage effect suspension, comprising: a rotating wheel that presses against the first pulley by a spring force of a spring material; a motor that rotates the rotating vehicle; A first rotation detecting means for detecting the rotation of the rotating wheel, and a second rotation detecting means for detecting the rotation of the second pulley. And the second rotation detecting means Detecting the rotation speed of the the rolling wheel second roller, the peripheral speed of said rotating wheel is provided with a control unit for controlling the rotational speed of the motor to be equal to the peripheral speed of the second pulley.
[0009]
Further preferably, the provided second rotation detecting means concurrently serve as rotation detection means for detecting a rotational direction of the second roller, the rotation direction of the second pulley that the rotation direction detecting means detects, A control unit for controlling the rotation direction of the motor is provided.
[0011]
Preferably, a brake switch unit and a brake unit that brakes the motor by operating the brake switch unit are provided.
[0012]
According to the present invention, an operator can easily lift and lower a suspended object with a small amount of labor with the help of power of an assist device.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing an entire lifting device for a stage effect hanging, FIG. 2 is a side view of an assist device, and FIG. 3 is a block diagram of a control system.
[0014]
In FIG. 1, reference numeral 1 denotes a baton on the stage 2, which holds stage effect hangings such as background panels and curtains. The baton 1 is suspended by being attached to one end of a rope 3 as a plurality of string-like bodies.
[0015]
A plurality of rolls 4 are provided on the ceiling above the baton 1. The rope 3 circulates around the roll 4 and is tuned to a first pulley 5 provided at the upper corner of the stage 2, and the other end of the rope 3 is connected to a counterweight 6 via a stopper 7 and a suspension rod 8. Is attached.
[0016]
A second pulley 10 is disposed below the first pulley 5. The second pulley 10 is tuned with a rope 11 as a string for manual operation. One end of the rope 11 is attached to the upper portion of the counterweight 6 via a stopper 7 and a hanging strap 8. When the operator holds the other end of the rope 11 with his hand and pulls it downward (arrow a), the counterweight 6 rises (arrow b) and the baton 1 falls (arrow c). The weight of the counterweight 6 may be heavier or lighter than the weight of the suspended object (on the baton 1 side). When released, the counterweight 6 is lowered by its own weight, and the baton 1 is raised.
[0017]
Reference numeral 12 denotes a fixing tool for the rope 11 provided on the stage 2. The fixture 12 is provided with a third pulley 13, and the other end of the rope 11 is tuned to the third pulley 13 and attached to the lower portion of the counterweight 6. Reference numeral 14 denotes a rope fixing stopper. When the stopper 14 is screwed, the lower end of the rope 11 is fixed to the fixing tool 12.
[0018]
An assist device 20 is provided on the side of the first pulley 5. Next, the assist device 20 will be described with reference to FIG. In FIG. 2, 16 is a frame on which the second pulley 10 is mounted, and 17 is a pedestal provided above the frame 16. The first pulley 5 and the assist device 20 are mounted on the pedestal 17. The assist device 20 is attached to an existing lifting device afterward.
[0019]
The assist device 20 includes a motor 21 as a power unit and a rotating wheel 23 that is driven by the motor 21 via the speed reducer 22 and rotates. As the motor 21, an inexpensive general-purpose motor can be used. The motor 21 has a first encoder 24 as first rotation detecting means. The first encoder 24 detects the rotational speed of the motor 21, but since the rotational speed of the rotating wheel 23 is a parameter of the rotational speed of the motor, the first encoder 24 serves as a rotation detecting means for the rotating wheel 23. It is also. As will be described later, the motor 21 rotates in a direction in which the counterweight 6 is raised or lowered.
[0020]
Reference numeral 25 denotes a fixing member fixed on the base 17, and a plurality of (two in this example) bolts 26 are attached thereto. A spring material 27 such as a coil spring is attached to the bolt 26, and the circumferential surface of the rotating wheel 23 is transverse to the first pulley 5 and / or the rope 3 tuned to the first pulley 5 by the spring force. It is elastically pressed from. In order to prevent idle rotation (idle slip) of the rotating wheel 23 in contact with the first pulley 5 and / or the rope 3, it is desirable to increase the friction coefficient by providing irregularities on the peripheral surface of the rotating wheel 23. Alternatively, the rotating wheel 23 and the first pulley 5 may be engaged with each other to prevent idle rotation.
[0021]
In FIG. 2, when the counterweight 6 rises, the first pulley 5 rotates in the clockwise direction d. At this time, the rotating wheel 23 rotates in the counterclockwise direction e by driving the motor 21 as described later. This assists the rotation of the first pulley 5 in the clockwise direction (that is, the direction in which the counterweight 6 is raised) d. In FIG. 1, reference numeral 15 denotes a foot-type switch unit for controlling the motor 21 provided in the vicinity of the fixture 12. By operating this switch unit 15, the motor 21 becomes drivable. When the second encoder 28 (described later) detects that the rope 11 has started to be pulled downward a, the motor 21 starts driving. The switch unit may be another switch unit such as a manual type.
[0022]
In FIG. 2, a second encoder 28 as a second rotation detecting means is in contact with the second pulley 10. Reference numeral 29 denotes a mounting member for mounting the second encoder 28 on the lower surface of the base 17. The second encoder 28 detects the rotation speed and rotation direction of the second pulley 10. That is, the second encoder 28 also serves as a rotation direction detection unit of the second pulley 10. When the weight of the counterweight 6 is heavier than that on the baton 1 side, when the counterweight 6 is raised, the operator pulls the rope 11 downward (arrow a). At this time, the second pulley 10 The rotation direction and the rotation speed are detected by the second encoder 28.
[0023]
FIG. 3 is a block diagram of the control system. The first encoder 24 and the second encoder 28 are connected to the control unit 30, and the control unit 30 controls the motor 21. When the second encoder 28 detects that the switch unit 15 has been stepped on and the second pulley 10 has started rotating due to the operation of the rope 11, the control unit 30 drives and rotates the motor 21.
[0024]
In FIG. 1, reference numeral 18 denotes a brake (brake) switch provided on the stage 2. The switch unit 18 is also preferably a foot-operated type. In FIG. 3, the control unit 30 has a braking unit 31. When the brake switch unit 18 is operated by stepping on the brake switch unit 18, the brake unit 31 stops driving the motor 21. The brake switch unit 18 is for stopping the baton 1 at a predetermined position, and is also for stopping the motor 21 to prevent danger. The braking unit 31 is an electrical torque brake and is a known one.
[0025]
The assist device 20 is configured as described above, and its handling operation will be described next. First, the case where the weight of the counterweight 6 is heavier than the weight on the baton 1 side will be described. In FIG. 1, the operator steps on the switch portion 15 with his / her foot, holds the rope 11 and pulls it downward a. At this time (ie, at the start of pulling), the rotation direction f of the second pulley 10 and the pulling-down speed V1 (FIG. 2) of the rope 11 are detected by the second encoder 28. The descending speed V1 of the rope 11 is equal to the peripheral speed of the second pulley 10. Therefore, the control unit 30 controls the rotational speed of the motor 21 so that the peripheral speed V2 (FIG. 2) of the rotating wheel 23 becomes equal to the peripheral speed V1 of the second pulley 10. The peripheral speed V2 is determined as a parameter of the output of the first encoder 24.
[0026]
As described above, by making the assist speed of the rotary wheel 23 (that is, the peripheral speed V2 of the rotary wheel 23) equal to the pulling down speed of the rope 11, that is, the peripheral speed V1 of the second pulley 10, the labor of the worker P Can be significantly reduced. Of course, it is not necessary for the peripheral speed V2 to be completely equal to the descending speed V1, and the labor of the worker P can be reduced by approaching this. When the baton 1 is lowered to a predetermined height by pulling the rope 11 downward a, the brake switch 18 is operated to stop the motor 21 and the stop 14 of the fixture 12 is operated. Fix the rope 11.
[0027]
When the baton 1 is raised, if the fixed state of the rope 11 by the stopper 14 is released, the counterweight 6 is lowered by its own weight, and the baton 1 is raised. When the baton 1 is raised to a predetermined height, the rope 11 is fixed by the stopper 14.
[0028]
Next, a case where the weight on the baton 1 side is heavier than the weight of the counterweight 6 will be described. First, the case where the baton 1 is lowered from the upper position will be described. In this case, if the stopper 14 is loosened, the baton 1 is heavier than the counterweight 6 and is lowered by its own weight. When the baton 1 is lowered to a predetermined position, the rope 11 is fixed by the stopper 14.
[0029]
Next, the case where the baton 1 is raised from the lower position will be described. In this case, the counterweight 6 are intended to be under side position indicated by a broken line. Therefore, the operator P pulls down the rope 11 extending downward from the lower part of the counterweight 6 (arrow g). Then, the second pulley 10 rotates counterclockwise h, and this rotation direction h is detected by the second encoder 28. Then, the control unit 30 assists the worker P by rotating the motor 21 in the direction in which the counterweight 6 descends (the direction in which the rotating wheel 23 rotates in the clockwise direction i in FIG. 2). When the baton 1 rises to a predetermined height, the brake switch unit 18 is operated to stop the motor 21 and fix the rope 11 with the stopper 14.
[0030]
【The invention's effect】
As described above, according to the present invention, it is possible to greatly reduce the labor of the worker who performs the lifting and lowering work of the suspended object. In addition, this assist device can be easily added to the existing manual lifting device and can be easily relocated.
[Brief description of the drawings]
FIG. 1 is a front view showing the entire lifting device for stage effect hangings. FIG. 2 is a side view of an assist device. FIG. 3 is a block diagram of a control system.
1 Baton 3 String (Rope)
5 First pulley 6 Counterweight 10 Second pulley 11 String for manual operation (rope)
DESCRIPTION OF SYMBOLS 15 Switch part 18 Brake switch part 20 Assist apparatus 21 Motor 23 Rotating wheel 24 1st encoder (1st rotational speed detection means)
28 Second encoder (second rotational speed detecting means)
30 Control unit 31 Brake unit

Claims (3)

A string that suspends a suspended object at one end, a first pulley on which the string is adjusted, a counterweight attached to the other end of the string, a second pulley, And a manually operated string for lifting and lowering the suspended object by manually operating the other end side and adjusting the weight of the counterweight. An assist device attached to a lifting device for a stage effect hanging,
A first rotation for detecting rotation of the rotating wheel, comprising: a rotating wheel that presses against the first pulley by a spring force of a spring material; a motor that rotates the rotating wheel; and a switch unit that controls the motor. Detection means and second rotation detection means for detecting the rotation of the second pulley are provided, and the rotation speed of the rotating wheel and the second pulley is detected by the first rotation detection means and the second rotation detection means. And a controller for controlling the rotation speed of the motor so that the peripheral speed of the rotating wheel becomes equal to the peripheral speed of the second pulley. Assist device. It said second rotation detection means concurrently serves as rotation detection means for detecting a rotational direction of the second roller, the rotation direction of the second pulley that the rotation direction detecting unit detects the rotation of the motor device for an elevator apparatus according to claim 1 Symbol stage effect for hanging of the mounting, characterized in that a control unit for controlling the direction. The assist device for a lifting device for a stage effect hanging according to claim 1 or 2 , further comprising a braking switch portion and a braking portion that brakes the motor by operating the braking switch portion.

Images