JP2003192242A - Main rope runout suppressing device and main rope runout suppressing method for elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a main rope vibration restraining device for an elevator capable of restraining vibration of a main rope even when a car is stopped. <P>SOLUTION: The displacement of the car 8 is detected by a displacement gauge 14 equipped with a reflection part 12 on an upper part of the car 8 and a light projecting and receiving device 13 on an upper part of an elevator shaft 1. The tension variation of the main rope 5 is detected by the displacement. A tension control signal for eliminating the tension variation is calculated by a tension control device 15 based on the information on the tension variation of the main rope 5. A tension adjusting device 16 is provided on a car side rope locking part 6. The tension adjusting device 16 displaces an end part of the main rope 5 in accordance with the tension control signal. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator main rope runout restraint apparatus and a main rope runout restraint method for restraining the runout of a main rope for suspending a car.

[0002]

2. Description of the Related Art Generally, when the tension acting on a main rope that suspends a car fluctuates due to acceleration / deceleration of a car, car shake due to mischief, or vertical vibration of a building due to an earthquake, the main rope vibrates vertically. , Also displaced horizontally. The horizontal displacement of the main rope, that is, the runout, increases as the height of the building increases and the head of the building increases. Especially when the car is located near the bottom floor,
The length of the main rope extending upward from the car becomes long, and the runout of the main rope may spread over the entire plane of the hoistway.

When the main rope swings in this manner, the main rope interferes with hoistway equipment such as guide rails, hall door devices, and various switches for car control, and the hoistway equipment and main rope are damaged. To do. On the other hand, for example, Japanese Patent Laid-Open No. 4-286
In Japanese Patent No. 586, a correction value for suppressing the tension change of the main rope is calculated from the deviation value between the acceleration command value sent to the hoisting machine and the actual car acceleration value to control the motor of the hoisting machine. , Thereby, a method of suppressing the swing of the main rope that occurs during traveling of the car is shown.

[0004]

SUMMARY OF THE INVENTION In the above-described conventional main rope runout suppressing method, the motor torque control is performed by superposing the car speed control and the correction control for suppressing the tension change of the main rope. Since the control is performed while the car is running, the control is considerably complicated, and sufficient effects cannot be obtained during acceleration / deceleration in which a large current needs to be supplied to the motor. Further, the swing of the main rope occurs even when the car is stopped, but the conventional suppression method cannot suppress the shake of the main rope while the car is stopped.

The present invention has been made to solve the above-mentioned problems, and a main rope runout suppressing device for an elevator, which is capable of restraining the runout of the main rope even when the car is stopped. And to obtain a method for suppressing main runout.

[0006]

A main rope runout suppressing device for an elevator according to the present invention comprises a main rope, a car suspended by the main rope, and a drive device for raising and lowering a car via the main rope. A tension control device that is provided in an equipped elevator and that suppresses the runout of the main rope, and a tension detection device that detects a tension change of the main rope, and a tension control signal that cancels the tension change based on information from the tension detection device. And a tension adjusting device for displacing the end portion of the main rope based on the tension control signal to adjust the tension of the main rope so as to suppress the tension change.

Further, the main rope runout suppressing device for an elevator according to the present invention is an elevator equipped with a main rope, a car suspended by the main rope, and a drive device for moving the car up and down through the main rope. A tension detecting device which is provided to suppress the swing of the main rope and detects a tension change of the main rope, and calculates a tension control signal for canceling the tension change based on the information from the tension detecting device. A tension control device and a tension adjusting device that adjusts the tension of the main rope so as to suppress the change in tension by vertically displacing the drive device based on the tension control signal are provided.

Further, the main rope runout suppressing device for an elevator according to the present invention includes a main rope, a car suspended by the main rope, a drive device for raising and lowering a car via the main rope, and a hoistway. Provided in an elevator provided with a return wheel around which the main rope is wound, which suppresses vibration of the main rope, a tension detection device for detecting a tension change of the main rope, information from the tension detection device The tension control device that calculates the tension control signal that cancels the tension change based on the above, and the rotational force is applied to the return wheel based on the tension control signal to suppress the tension change of the main rope so as to suppress the tension change. Is equipped with a tension adjusting device for adjusting.

Further, the main rope runout restraint device for an elevator according to the present invention includes a main rope, a car suspended by the main rope, a drive device for raising and lowering a car via the main rope, and a hoistway. Is provided in the elevator equipped with a return wheel around which the main rope is wound, which suppresses the swing of the main rope, and is a tension detecting device for detecting a tension change of the main rope, from the tension detecting device. Based on the information, a tension control device that calculates a tension control signal that cancels the tension change, and by displacing the return wheel in the vertical direction based on the tension control signal, the tension change of the main rope is suppressed. It is provided with a tension adjusting device for adjusting the tension.

Further, as the tension detecting device, a displacement gauge for detecting the tension change of the main rope by detecting the displacement of the car is used. Further, as the tension detecting device, an accelerometer mounted on the car and used to detect the change in tension of the main rope by detecting the acceleration of the car was used. Furthermore, a tension detecting device having a pressing roller that presses the main rope with a predetermined pressing force and that is displaced horizontally according to the tension of the main rope is used. Further, as the tension detecting device, a load meter that detects the change in tension of the main rope by detecting the load of the driving device was used.

The elevator main rope runout suppressing method according to the present invention is based on the step of detecting the tension change of the main rope suspending the car when the car is stopped, and the magnitude and frequency of the tension change. Then, a step of calculating a tension control signal that cancels the tension change and a step of adjusting the tension of the main rope so as to suppress the tension change based on the tension control signal are included.

Further, the tension of the main rope is adjusted by driving a drive device for raising and lowering the car.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1. 1 is a configuration diagram showing a main rope runout suppressing device for an elevator according to Embodiment 1 of the present invention. The elevator roping method shown in FIG. 1 is 2: 1.
It is a roping method.

In the figure, a drive device 2 is arranged above the hoistway 1. The drive device 2 has a motor 3 and a drive sheave 4. A main rope 5 is wound around the drive sheave 4. One end of the main rope 5 is connected to a car side rope stopper 6 provided on the upper part of the hoistway 1. The other end of the main rope 5 is connected to the balance weight side rope stop portion 7 provided on the upper portion of the hoistway 1.

The drive sheave 4 of the main rope 5 and the rope stop 6 on the car side
A car 8 is hung between and. Below the car 8, a pair of car suspension wheels 9 around which the main ropes 5 are wound are provided. A counterweight 10 is suspended between the drive sheave 4 of the main rope 5 and the counterweight-side rope stop portion 7. A counterweight suspension vehicle 11 around which the main rope 5 is wound is provided on the counterweight 10. The car suspension wheel 9 and the counterweight suspension wheel 11 function as moving pulleys when the car 8 and the counterweight 10 are moved up and down.

A reflecting portion 12 for reflecting electromagnetic waves is provided on the top of the car 8. Above the hoistway 1, there is provided a light projecting / light receiving unit 13 that emits electromagnetic waves toward the reflecting unit 12 and receives the electromagnetic waves reflected by the reflecting unit 12. As the electromagnetic wave, for example, laser light or millimeter wave is used.

A displacement gauge 14 as a tension detecting device has a reflecting portion 12 and a light emitting / receiving portion 13. Further, the displacement meter 14 measures the distance from the time until the electromagnetic wave emitted from the light projecting / receiving unit 13 is reflected by the reflecting unit 12 and returns to the car 8 and detects the change in tension of the main rope 5.

The detection signal from the displacement gauge 14 is sent to the tension controller 15. The tension control device 15 calculates a tension control signal that cancels the tension change based on the magnitude and frequency of the tension change detected by the displacement gauge 14. A tension adjusting device 16 for displacing one end of the main rope 5 is provided on the car side rope stopper 6. Tension adjusting device 1
6 adjusts the tension of the main rope 5 so as to suppress the change in tension by displacing one end of the main rope 5 in the vertical direction based on the tension control signal from the tension control device 15. The main rope shake suppressing device according to the first embodiment includes a displacement gauge 14, a tension control device 15, and a tension adjusting device 16.

In such a main rope runout suppressing device, the main rope 5
When a change in tension of the main rope 5 is detected via the displacement gauge 14, one end of the main rope 5 is vertically displaced so as to cancel the change in tension. As a result, vertical vibration and horizontal vibration of the main rope 5 are suppressed.
Therefore, the swing of the main ropes 5 can be suppressed even when the car 8 is being lifted or lowered or when the car 8 is stopped. Further, since the tension change is suppressed in a system different from the operation control of the drive device 2, the control is easy.

The concrete construction of the tension adjusting device 16 is not particularly limited. For example, the car side rope stopper 6
May be moved up and down by a linear motor. Further, the driving force of the rotary motor may be converted into a linear motion to move the car side rope stopper 6 up and down. Furthermore, main rope 5
The car side rope stopper 6 may be moved up and down by a hydraulic cylinder or an air cylinder as long as it can cope with the change in tension.

Further, as the tension adjusting device 16, an electric induction fluid (electric dielectric fluid) whose viscosity changes according to an electric signal
(See, for example, Japanese Patent Laid-Open No. 2000-255938), by actively changing the rigidity of the spring of the car side rope stopper 6, the end portion of the main rope is substantially moved up and down to suppress the change in tension. The device may be applied.

Further, a tension adjusting device having an adjusting sheave for winding one end of the main rope and a motor for rotating the adjusting sheave may be used. In this case, by winding the main rope around the adjusting sheave or sending the main rope out of the adjusting sheave, the substantial end of the main rope is moved up and down, causing the main rope to swing. Suppressed.

Furthermore, in the above example, the elevator of the 2: 1 roping system is shown, but the same main rope deflection suppressing device can be applied to the elevator of the 1: 1 roping system. In this case, since the terminal of the main rope is connected to the car, the main rope shake suppressing device is mounted on the car.

Further, in the above example, the tension adjusting device 16 is provided only on the car side rope fastening portion 6, but it may be provided on the counterweight side rope fastening portion 7. Further, in the above example, the reflecting portion 12 is arranged in the car 8 and the light projecting / light receiving portion 13 is arranged in the upper part of the hoistway 1, but they may be reversed.

Embodiment 2. Next, FIG. 2 is a configuration diagram showing a main rope shake suppressing device for an elevator according to Embodiment 2 of the present invention. The elevator roping method shown in FIG. 2 is a 1: 1 roping method. In the figure,
A machine room 21 is provided above the hoistway 1. A machine base 22 is installed in the machine room 21. A drive device 23 is mounted on the machine base 22. The drive device 23 has a motor 24 and a drive sheave 25.

A deflector wheel 26 is provided in the machine room 21. A main rope 27 is wound around the drive sheave 25 and the deflector wheel 26. The car 8 is suspended at one end of the main rope 27. The counterweight 10 is hung at the other end of the main rope 27.

An accelerometer 28 as a tension detecting device is mounted on the car 8. The accelerometer 28 detects a change in tension of the main rope 27 by measuring the vertical vibration of the car 8. The detection signal from the accelerometer 28 is sent to the tension controller 29. The tension control device 29 calculates a tension control signal that cancels the tension change of the main rope 27 based on the acceleration detected by the accelerometer 28.

A tension adjusting device 30 for vertically displacing the drive device 23 is provided between the machine base 22 and the drive device 23. The tension adjusting device 30 is the tension control device 2
By displacing the drive device 23 in the vertical direction based on the tension control signal from the cable 9, the tension of the main rope 27 is adjusted so as to suppress the tension change. The main rope shake suppressing device according to the second embodiment includes an accelerometer 28, a tension control device 29, and a tension adjusting device 30.

In such a main rope runout suppressing device, the main rope 2
When the vibration of the main rope 27 is detected and a change in the tension of the main rope 27 is detected via the accelerometer 28, the drive device 23 is vertically displaced so as to cancel the change in the tension. As a result, vertical vibration and horizontal vibration of the main rope 27 are suppressed. Therefore, the swing of the main ropes 27 can be suppressed even when the car 8 is being raised or lowered or when the car 8 is stopped. Further, since the tension change is suppressed in a system different from the operation control of the drive device 23, the control is easy.

Embodiment 3. Next, FIG. 3 is a configuration diagram showing a main rope shake suppressing device for an elevator according to a third embodiment of the present invention. In the figure, a car side return wheel 31 and a counterweight side return wheel (not shown) are provided at the upper part of the hoistway 1. A drive device (not shown) for raising and lowering the car 8 and the counterweight (not shown) is arranged in the lower part of the hoistway 1.

The main rope 32 is wound in the order of a car suspension car 9, a car side return car 31, a drive sheave (not shown) of a drive device, a counterweight side return car and a counterweight suspension car (not shown). It is hung. In the hoistway 1, a pressing roller 33 that is rotated in contact with the main rope 32 is provided. Pressing roller 33
Is pressed against the main rope 32 with a predetermined pressing force, and is displaced in the horizontal direction according to a change in tension of the main rope 32.

Further, in the hoistway 1, a pair of rotating rollers 34, which are rotated in contact with the main ropes 32, are provided at intervals in the vertical direction. The pair of rotating rollers 34,
The main rope 32 is received above and below the pressing roller 33, and the change of the trajectory of the main rope 32 due to the pressing of the pressing roller 33 is prevented. The tension detecting device 35 according to the third embodiment includes a pressing roller 33 and a rotating roller 34, and detects a tension change of the main rope 32 by the displacement of the pressing roller 33 in the horizontal direction.

The detection signal from the tension detector 35 is sent to the tension controller 36. The tension control device 36 calculates, based on the signal from the tension detection device 35, a tension control signal that cancels the tension change of the main rope 32. A rotating force applying device 37 as a tension adjusting device is connected to the car side return wheel 31. The torque applying device 37 applies a torque to the car side return wheel 31 as needed.

Further, the rotational force imparting device 37, based on the tension control signal from the tension controller 36, causes the car side return wheel 31 to move.
By rotating, the tension of the main rope 32 is adjusted so as to suppress the change in tension. The main rope shake suppressing device according to the third embodiment includes a tension detecting device 35, a tension controlling device 36, and a rotational force applying device 37.

In such a main rope runout suppressing device, the main rope 3
2 is shaken and the tension change of the main rope 32 is caused by the tension detecting device 3
When detected by 5, the rotational force is applied to the car side return wheel 31 so as to cancel the change in tension. This allows
Vertical vibration and horizontal vibration of the main rope 32 are suppressed. Therefore, even when the car 8 is moving up and down, the car 8
It is possible to suppress the swing of the main ropes 32 even when the vehicle is stopped. Further, since the tension change is suppressed by a system different from the operation control of the drive device, the control is easy.

In the above example, the rotating force is applied to the car side return wheel 31, but the rotating force may be applied to the counterweight side return wheel.

Fourth Embodiment In addition, in the third embodiment,
A rotational force is applied to the car side return wheel 31, but as shown in FIG. 4, for example, a return wheel displacement device 38 for vertically displacing the car side return wheel 31 or the counterweight side return wheel is used as a tension adjusting device. May be.

Embodiment 5. Next, FIG. 5 is a configuration diagram showing a main rope shake suppressing device for an elevator according to a fifth embodiment of the present invention. In the figure, a machine base 22 and a drive unit 24
A load meter 41 as a tension detecting device is provided between and. The load meter 41 detects a change in the load applied to the drive device 24 while the car 8 is stopped, so that the main rope 27
The change in tension of is detected.

The tension detection signal from the load meter 41 is output to the tension controller 42. The tension control device 42 is used for the car 8
During the stop, the tension control signal for canceling the tension change is calculated based on the magnitude and frequency of the tension change detected by the load meter 41. In addition, the tension control device 42
The tension control signal from is output to the drive device 23. In the drive device 23, the tension of the main rope 27 is adjusted based on the tension control signal so as to suppress the tension change.

In the elevator, even when the car 8 is stopped, if the building vibrates due to an earthquake or the car 8 is shaken by mischief, the main rope 27
The tension of fluctuates. As a result, the main rope 27 vibrates vertically and is also displaced in the horizontal direction with a certain period and amplitude as shown by the two-dot chain line in the figure.

At this time, the greater the fluctuation of the tension, the greater the amplitude of the horizontal vibration of the main rope 27 becomes. Therefore,
By detecting a change in tension of the main rope 27, horizontal vibration of the main rope 27 can also be detected. There are various methods for detecting the tension of the main rope 27, but the fifth embodiment
Then, the load meter 41 is used for detection.

The load meter 41 receives a force obtained by adding the weight of the driving device 23 itself and the tension of the main rope 27, but since the weight of the driving device 23 does not change, the fluctuation of the detection output is caused by the main rope 27. Changes in tension. When the amplitude and cycle of the tension change of the main rope 27 are input to the tension control device 42, for example, the vertical vibration waveform of the car 8 is calculated, the motor 24 is driven by this waveform, and the main vibration is generated via the drive sheave 25. The rope 27 is vibrated. Thereby, the tension vibration generated in the main rope 27 is suppressed, and the vibration of the main rope 27 is greatly suppressed.

Further, since the horizontal vibration of the main rope 27 is suppressed while the car 8 is stopped, the swing of the main rope 27 does not increase due to the fluctuation of the length of the main rope 27 after the start of traveling, and It is not necessary to increase the control force for suppressing the vibration.

Sixth Embodiment In the fifth embodiment,
Although the load cell 41 is used as the tension detecting device, for example, as shown in FIG.
As shown in, the displacement gauge 14 and the accelerometer 28 similar to those of the first embodiment may be used to detect the tension change of the main rope 27 while the car 8 is stopped.

As described above, the combination of the tension detecting device and the tension adjusting device shown in the above-described first to sixth embodiments can be selectively changed in various ways. Embodiment 5
6 suppresses the swing of the main rope 27 only while the car 8 is stopped, but in the first to fourth embodiments, the shake of the main rope can be suppressed while the car is stopped and while the car is running. it can. While the car is traveling, the tension change of the main rope can be detected from the output of the encoder provided in the drive device (hoisting machine) and the torque current of the drive device.

In addition to the above, for example, a balance device installed in a car for detecting the load inside the car, a displacement meter for detecting the compression amount of the spring of the rope stopper, or the like can be used as the tension detecting device.

Further, when a load meter is used as the tension detecting device, the load at the end of the main rope is also detected.
A change in tension of the main rope can be detected. That is, the detected amounts of displacement, acceleration, and load can be equivalently detected regardless of the positions of the car, the end of the main rope, and the drive device, and the tension change of the main rope is obtained from the detection result. be able to.

[0048]

As described above, the main rope runout restraint device for an elevator according to the present invention cancels the tension change based on the information from the tension detecting device detecting the tension change of the main rope and the tension detecting device. A tension control device that calculates a different tension control signal by calculation, and a tension adjustment device that adjusts the tension of the main rope so as to suppress the tension change by displacing the end portion of the main rope based on the tension control signal Therefore, the swing of the main rope can be suppressed while the car is traveling or stopped, and the tension change can be suppressed by a system different from the drive device operation control, and control can be performed easily. You can

Further, the tension detecting device for detecting the tension change of the main rope, the tension control device for calculating the tension control signal for canceling the tension change based on the information from the tension detecting device, and the tension control signal Since a tension adjusting device that adjusts the tension of the main rope so as to suppress the change in tension by displacing the driving device in the vertical direction is provided, whether the main rope is running or stopped Can be suppressed, and the change in tension can be suppressed by a system different from the operation control of the drive unit, and the control can be easily performed.

Further, the tension detecting device for detecting the tension change of the main rope, the tension control device for calculating the tension control signal for canceling the tension change based on the information from the tension detecting device, and the tension control signal Since a tension adjusting device that adjusts the tension of the main rope so as to suppress the tension change by applying a rotational force to the return wheel is provided, the main rope can be used whether the car is running or stopped. Can be suppressed, and the change in tension can be suppressed by a system different from the operation control of the drive unit, and the control can be easily performed.

Furthermore, the tension detecting device for detecting the tension change of the main rope, the tension control device for calculating the tension control signal for canceling the tension change based on the information from the tension detecting device, and the tension control signal By displacing the return wheel in the vertical direction based on the above, a tension adjusting device for adjusting the tension of the main rope so as to suppress the change in tension is provided.
It is possible to suppress the swing of the main ropes while the car is traveling or stopped, and it is possible to easily control by suppressing the tension change in a system different from the drive device operation control. .

Further, as the tension detecting device, since the displacement gauge for detecting the tension change of the main rope by detecting the displacement of the car is used, the tension change can be detected with a simple structure. Furthermore, as a tension detection device, it is installed in the car,
Since the accelerometer that detects the tension change of the main rope by detecting the car acceleration is used, the tension change can be detected with a simple structure. Furthermore, since the tension detecting device having the pressing roller that presses the main rope with a predetermined pressing force and that is horizontally displaced according to the tension of the main rope is used, it is possible to detect the tension change with a simple structure. it can. Further, as the tension detecting device, since the load meter that detects the tension change of the main rope by detecting the load of the drive device is used, the tension change can be detected with a simple structure.

The elevator main rope runout suppressing method according to the present invention is based on the step of detecting the tension change of the main rope suspending the car when the car is stopped, the magnitude of the tension change and the frequency. Therefore, it includes a step of calculating a tension control signal that cancels the tension change and a step of adjusting the tension of the main rope so as to suppress the tension change based on the tension control signal. The swing of the rope can be suppressed. Further, since the tension of the main rope is adjusted by driving the driving device for raising and lowering the car, the tension of the main rope can be adjusted with a simple structure.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a main rope runout suppressing device for an elevator according to Embodiment 1 of the present invention.

FIG. 2 is a configuration diagram showing a main rope runout suppressing device for an elevator according to Embodiment 2 of the present invention.

FIG. 3 is a configuration diagram showing a main rope runout suppressing device for an elevator according to Embodiment 3 of the present invention.

FIG. 4 is a configuration diagram showing an elevator main rope runout suppressing device according to a fourth embodiment of the present invention.

[Fig. 5] Fig. 5 is a configuration diagram showing a main rope shake suppressing device for an elevator according to Embodiment 5 of the present invention.

[Fig. 6] Fig. 6 is a configuration diagram showing a main rope shake suppressing device for an elevator according to Embodiment 6 of the present invention.

[Explanation of symbols]

2,23 Drive device, 5,27,32 Main rope, 8 car, 14 Displacement meter (tension detection device), 15, 29,36
Tension control device, 16, 30, 37 Tension adjustment device, 2
8 accelerometer (tension detection device), 31 car side return car,
33 pressing roller, 35 tension detecting device, 38 return wheel displacement device (tension adjusting device).

Claims (10)

[Claims] 1. An elevator equipped with a main rope and a drive system for raising and lowering the car via the main rope, the car being suspended by the main rope, and suppressing the swing of the main rope. A main rope runout suppressing device for an elevator, which is a tension detecting apparatus that detects a tension change of the main rope, and a tension control signal that cancels the tension change is calculated based on information from the tension detecting apparatus. A control device and a tension adjusting device that adjusts the tension of the main rope so as to suppress the change in tension by displacing the end portion of the main rope based on the tension control signal. Main rope runout restraint device for elevators. 2. An elevator equipped with a main rope and a drive system for raising and lowering the car through the main rope, the car being suspended by the main rope, and suppressing the swing of the main rope. A main rope runout suppressing device for an elevator, a tension detecting apparatus that detects a tension change of the main rope, and a tension control signal that cancels the tension change is calculated based on information from the tension detecting apparatus. And a tension adjusting device that adjusts the tension of the main rope so as to suppress the change in tension by vertically displacing the drive device based on the tension control signal. Main rope runout restraint device for elevators. 3. A main rope, a drive system for raising and lowering the car via the main rope, a car suspended by the main rope, and a drive device provided in the hoistway for winding the main rope. A main rope runout suppressing device for an elevator equipped with a return wheel and for suppressing runout of the main rope, which is a tension detecting device for detecting a change in tension of the main rope, and information from the tension detecting device. Based on the above, a tension control device that calculates a tension control signal that cancels the tension change, and a rotational force is applied to the return wheel based on the tension control signal to suppress the tension change. A main rope runout suppressing device for an elevator, comprising a tension adjusting device for adjusting the tension of the main rope. 4. A main rope, a drive system for raising and lowering the car via the main rope, a car suspended by the main rope, and a drive device provided in the hoistway for winding the main rope. A main rope runout suppressing device for an elevator equipped with a return wheel and for suppressing runout of the main rope, which is a tension detecting device for detecting a change in tension of the main rope, and information from the tension detecting device. Based on the above, a tension control device that calculates a tension control signal that cancels the tension change, and by displacing the return wheel in the vertical direction based on the tension control signal, the tension change is suppressed. A main rope runout suppressing device for an elevator, comprising a tension adjusting device for adjusting the tension of the main rope. 5. The displacement detecting device according to claim 1, wherein the tension detecting device is a displacement gauge that detects a change in tension of the main rope by detecting a displacement of the car. Main rope runout restraint device for elevators. 6. The accelerometer mounted on the car, wherein the tension detecting device is an accelerometer for detecting a change in tension of the main rope by detecting an acceleration of the car. 4. The main rope runout suppressing device for an elevator according to any one of 4 above. 7. The tension detecting device includes a pressing roller that presses the main rope with a predetermined pressing force and that is displaced horizontally according to the tension of the main rope. The main rope runout suppressing device for an elevator according to any one of claims 1 to 4. 8. The load detecting device according to claim 1, wherein the tension detecting device is a load meter that detects a change in tension of the main rope by detecting a load of the driving device.
The main runout restraint device for an elevator according to any one of 1. 9. A step of detecting a change in tension of a main rope that suspends the car when the car is stopped, such that the change in tension is canceled based on the magnitude and frequency of the change in tension. A main rope runout suppressing method for an elevator, comprising: a step of calculating a tension control signal by calculation; and a step of adjusting the tension of the main rope so as to suppress the tension change based on the tension control signal. 10. The main rope runout suppressing method for an elevator according to claim 9, wherein the tension of the main rope is adjusted by driving a drive device for raising and lowering the car.