JP2007076909A - Safety device for multi-car elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To positively detect the abnormal approach of a car to avoid a contact situation. <P>SOLUTION: A multi-car elevator with two or more cars 1a, 1b provided in a travelable manner in a hoistway comprises rotating speed detectors 6a, 6b provided at hoisting machines 2a, 2b for driving the cars 1a, 1b, to detect the rotating speed of the respective hoisting machines 2a, 2b; absolute position detecting means 8a, 8b converting the rotating speed detected by the respective rotating speed detectors 6a, 6b into the absolute positions of the respective cars 1a, 1b; a relative distance computing means 9 computing the relative distance of the upper and lower cars 1a, 1b from the absolute positions of the respective cars 1a, 1b detected by the car absolute position detecting means 8a, 8b; and an operation control means 10 limiting the operation of the cars 1a, 1b when the relative distance reaches a predetermined distance or less. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a safety device for a multi-car elevator in which a plurality of cars travel independently in one hoistway.

  The multi-car elevator takes an operation form in which a plurality of cars travel independently in one hoistway for the purpose of improving the transportation efficiency of the elevator. However, while having such merits, there is a risk of coming into contact with the car.

  Therefore, conventionally, a safety device for a multi-car elevator has been proposed in order to avoid contact between upper and lower cars.

  In this multi-car elevator safety device, as shown in FIG. 5, two cars 52a and 52b are provided in a hoistway 51 so that they can run independently of each other, and the upper car 52a includes the car. An arcuate operating body 53 is provided so as to protrude vertically from 52a. For example, a J-shaped actuator 54 is provided on the lower car 52b so as to protrude downward from the car 52b. Further, a switch 55 for outputting a signal for stopping the operation of each of the cars 52a and 52b when the actuator 53 is pressed is attached to the upper part of the lower car 52b.

  In this multi-car elevator, the two cars 52a and 52b are running independently of each other. When the upper car 52a and the lower car 52b approach each other, the upper car 52a is provided. The lower end of the arcuate actuator 53 comes into contact with the contact of the switch 55, and an operation stop signal is sent from the switch 55 to an elevator control panel (not shown). Here, the elevator control panel determines that the two upper and lower cars 52a and 52b are abnormally approaching, and outputs a command to stop the operation of the two cars 52a and 52b.

  56u is a switch that operates when the upper car 52a is about to pass a predetermined position on the upper part of the hoistway, and 56d is a switch that is operated when the lower car 52b is about to pass a predetermined position on the upper part of the hoistway. (Patent Document 1).

As shown in FIG. 6, a conventional multi-car elevator safety device is provided with two cars 61a and 61b in a state where they can run independently in a hoistway (not shown), of which an upper car 61a is a car whose central part is suspended by a main rope 62a wound around a hoisting machine (not shown), and the lower car 61b does not interfere with the upper car 61a by another main rope 62b. The end side is suspended. A distance measuring device 63 and a car proximity detector 64 for measuring the distance from the upper car 61a are installed on the upper part of the lower car 61b. The distance measuring device 63 transmits the laser beam and receives the laser beam reflected from the upper car 61a, so that the distance between the upper car 61a and the lower car 61b is determined from the transmission / reception time of the laser beam. The distance between them is measured and notified to an elevator control panel (not shown). The car proximity detector 64 operates when the upper car 61a and the lower car 61b approach a certain distance, as in FIG. 5, and notifies the elevator control panel and the like that the car is in an abnormally close state. is there.
JP 59-133188 (pages 1 to 5, FIG. 11) Japanese Patent Laying-Open No. 2003-261276 (pages 35 to 38, FIG. 26)

However, the following problems have been pointed out in the safety devices for multi-car elevators as described above.
Consider a case where two cars 52a and 52b (including 61a and 61b in the hoistway 51) in the hoistway 51 travel in directions approaching each other at the same travel speed. Now, the traveling speed of the cars 52a and 52b is V0, and the time until the brakes for stopping the cars 52a and 52b are actuated after detecting the approaching state of the cars 52a and 52 by the switch 55 is T0. Assuming that the deceleration of the brake is α, the minimum relative distance L necessary for the two cars 52a and 52b not to contact each other can be expressed by the following equation (1).

L = 2 × {V0 × T0 + V0 ² / (2 × α)} (1)
Here, T0 = 0.3 s and α = 1.5 m / s ² are used as general numerical values of the brake operation time T0 and the brake deceleration α in the above equation. Therefore, when both cars 52a and 52b are traveling at a traveling speed of 120 m / min (= 2 m / s), L = about 4 m, but exactly double 240 m / min (= 4 m / s). When traveling at a traveling speed, the distance is 13 m. That is, if the traveling speed is increased, the possibility of contact is increased unless a very long relative distance L is maintained.

  In the case of an elevator traveling at a relatively low speed, it is possible to avoid contact between the two cars 52a and 52b by using the mechanical switches (53 and 55) and 64 as described above. However, when the elevator is caused to travel at a higher speed as the building becomes taller, it is necessary to attach a long projecting body (operating body 53 or car proximity detector 64) based on the formula (1). However, attaching a very long projecting body may cause interference with other components of the elevator, strength, misalignment of the projecting body due to the shaking of the car, etc. It is difficult to realize in terms of detection accuracy and the like.

  Further, although the distance measuring device 63 shown in FIG. 6 is different in structure from the above-described projecting body, there is a problem that it becomes difficult to adjust the optical axis of the laser light as the relative distance between the two cars 61a and 61b increases. is there. In other words, if the cars 61a and 61b are inclined due to a slight reflection deviation of the laser light or the passenger's boarding position in the cars 61a and 61b, the reflected laser light cannot be received accurately. In addition, when smoke or dust enters the hoistway in an emergency, the laser beam is blocked by the smoke or the like, and it becomes difficult to receive the reflected laser beam.

  Further, in order to accurately receive the laser beam even if the relative distance L between the cars 61a and 61b is long, it is necessary to increase the output of the distance measuring device 63, but there is a problem that the cost increases.

  The present invention has been made in view of the circumstances as described above, and provides a safety device for a multi-car elevator that can reliably detect an abnormal approach of a car and avoid contact between the upper and lower cars. With the goal.

  In order to solve the above-mentioned problems, the present invention provides an absolute position detecting means for detecting the absolute position of each car of a multi-car elevator provided so that two or more cars can run in a hoistway, and the car. Relative distance calculating means for calculating the relative distance of each car from the absolute position of each car detected by the absolute position detecting means; and when the relative distance of each car approaches a predetermined distance or less, the car Is a safety device for a multi-car elevator provided with operation control means for limiting the speed of the vehicle.

  Further, the present invention is provided in each car of a multi-car elevator provided so that two or more cars can run in the hoistway, and when each car is running in a direction approaching each other, and A relative distance detecting hand for detecting the first and second relative distances set in correspondence with each of the cars traveling in the same direction and approaching each other; and the first or second relative A safety device for a multi-car elevator provided with operation control means for restricting the operation of each car when it is detected that a distance is approached.

  Further, according to the present invention, the relative distance detecting means is newly attached to any one of the respective cars, and has a predetermined first length from the one car surface to the other car. The operating body and the other car are attached to and protruded from the other car in the direction of the one car, and predetermined first and second distances (first distance <second distance). When the first and second switches provided at positions having the above and the respective cars are traveling in the same direction and approaching each other, the operating body of the one of the cars moves the first switch. The means for detecting that the first relative distance has been approached when operated and the respective cars approaching each other in the same direction, the actuating body of the one car has the second switch The second relative distance when operating It is further added to the configuration and means for detecting that approached.

  Furthermore, the present invention provides a main rope wound around a hoisting machine or a governor sheave that moves up and down according to the traveling of each car of a multi-car elevator provided so that two or more cars can run in the hoistway. Alternatively, a relative distance detecting means provided on a governor rope for detecting that each of the cars has reached a predetermined relative distance, and when the relative distance detecting means detects that the predetermined relative distance has been reached, the car Is a safety device for a multi-car elevator provided with operation control means for restricting traveling of the vehicle.

  According to the present invention, it is possible to provide a safety device for a multi-car elevator that can reliably detect an abnormal approach of a car and can avoid contact with each car.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
1 and 2 are a schematic front view and a schematic top view showing one embodiment of a safety device for a multi-car elevator according to the present invention. Here, FIG. 1 shows a roping configuration for raising and lowering two upper and lower cars installed in a hoistway, and FIG. 2 shows an arrangement relationship of components related to two upper and lower cars.

  This multi-car elevator is provided such that two passenger cars 1a and 1b can run in the vertical direction in an independent state in a hoistway (not shown). The hoisting machines 2a and 2b are installed in the upper part of the hoistway so as not to interfere with the two upper and lower cars 1a and 1b traveling in the hoistway. One end of the main ropes 3a and 3b wound around these hoisting machines 2a and 2b is connected to each car via car lower sheaves 4a-4a and 4b-4b arranged below the car 1a and 1b. 1a and 1b are hung around to be held and fixed to predetermined fixed ends 5a and 5b (5b is not shown). Although not shown, a counterweight is suspended from the other ends of the main ropes 3a and 3b.

  Further, rotation speed detectors 6a and 6b such as a pulse generator for generating a pulse each time a predetermined rotation angle or a predetermined rotation speed is detected are mounted on the rotation shafts of the hoisting machines 2a and 2b. The pulses generated from the rotation speed detectors 6 a and 6 b are transmitted to the elevator control device 7. The elevator control device 7 includes absolute position detection means 8 a and 8 b and a relative distance calculation means 9. The absolute position detection means 8a, 8b obtains control signals for rotationally driving the hoisting machines 2a, 2b, and pulses generated from the rotational speed detectors 6a, 6b based on the traveling directions of the cars 1a, 1b. Is counted up and down, and the car positions of the cars 1a and 1b are detected from the counted values. The relative distance calculation means 9 calculates the relative distance between the upper and lower cars 1a and 1b from the car positions of the cars 1a and 1b obtained by the absolute position detection means 8a and 8b.

  The elevator control device 7 is provided with operation control means 10. The operation control means 10 determines the relative distance between the upper and lower two cars 1a and 1b calculated by the relative distance calculating means 9 and the determination relative distance corresponding to the abnormal approach of the two upper and lower cars 1a and 1b. And compare. Then, when the relative distance between the upper and lower cars 1a and 1b becomes substantially equal to the relative distance for determination, it is determined that the vehicle is abnormally approached, and an operation control command for limiting the operation of the cars 1a and 1b is issued. Output.

  In addition to the hoisting machines 2a and 2b for raising and lowering the passenger cars 1a and 1b, the elevators 1a and 1b are provided with the elevator cars 1a and 1b when the elevator cars 1a and 1b reach a speed higher than a set speed. In order to stop the traveling, the governor sheaves 11a-11a, 11b-11b are installed at the upper and lower portions of the hoistway that covers the traveling range of the cars 1a, 1b so as not to interfere with each other. These upper and lower governor sheaves 11a, 11a, 11b, and 11b are endlessly spanned with governor ropes 12a and 12b, respectively. The cars 1a and 1b and the governor ropes 12a and 12b are connected to each other via links 13a and 13b, respectively. When each of the cars 1a and 1b travels at a speed equal to or higher than the set speed, the governor sheaves 11a, 11a, 11b, and 11b stop rotating, and accompanying this, the brake devices (see FIG. It stops by operating to grip the main rail (not shown).

Next, the operation of the safety device according to the present invention configured as described above will be described.
When a speed command with a running direction is output from the operation control means 10 in the elevator control device 7 to drive and rotate the hoisting machines 2a and 2b, a rotational speed generator attached on the rotating shaft of the hoisting machines 2a and 2b. Pulses corresponding to the rotation angle or the rotation speed are generated from 6a and 6b. Based on the generated pulses, the car positions of the cars 1a and 1b are detected. At this time, the relative distance calculation means 9 calculates the relative distance between the two cars 1a and 1b from the car positions detected by the absolute position detection means 8a and 8b, and outputs the relative distance to the operation control means 10. The operation control means 10 stores in advance a relative distance for determination representing an abnormal approach of the two cars 1a and 1b, and the relative distance sent from the relative distance calculation means 9 exceeds the relative distance for determination. Is approached abnormally. And it controls so that rotation of each hoisting machine 2a, 2b is restrict | limited, and the contact of both the car 1a, 1b is avoided.

  As an example of restricting the rotation of the hoisting machines 2a and 2b, for example, when both the cars 1a and 1b are operating ascending, the traveling speed of the lower car 1b is suppressed or stopped. Alternatively, it is conceivable to increase the traveling speed of the upper car 1a. In addition, when the two cars 1a and 1b are traveling in directions approaching each other, different determination relative distances are used than when the two cars 1a and 1b are traveling in the same direction. When the relative distance between the two cars 1a and 1b approaches the relative distance for determination, control is performed so that the operations of the cars 1a and 1b are stopped simultaneously.

  Therefore, according to the embodiment as described above, the rotational speed detectors 6a and 6b are attached to the hoisting machines 2a and 2b, and the pulses with the rotational direction detected by the rotational speed detectors 6a and 6b are increased. Or it counts down and calculates the car position of each car 1a, 1b from the count value. Therefore, the relative distance between the two cars 1a and 1b can be accurately calculated from the car positions of the two cars 1a and 1b. Therefore, it is possible to reliably detect an abnormal approach between the two cars 1a and 1b without using a mechanical switch.

  In addition, even when the two cars 1a and 1b are traveling at high speed or a relative distance that is sufficiently separated, the relative distance that changes from moment to moment can be accurately calculated. Moreover, these can be realized safely and at low cost.

  In the above embodiment, the hoisting machines 2a and 2b are provided with the rotational speed detectors 6a and 6b. For example, even when attached to the car lower sheaves 4a and 4b and the governor sheaves 9a and 9b at the lower part of each car, Similarly, the car position or relative distance of each car 1a, 1b in the hoistway can be detected.

(Embodiment 2)
FIG. 3 is a schematic configuration diagram showing another embodiment of the safety device for a multi-car elevator according to the present invention.

  The multi-car elevator is provided such that two passenger cars 21a and 21b can travel in the vertical direction in an independent state in a hoistway (not shown). Of these two cars 21a and 21b, an operating body 22 having a length L1 is attached downward from one side surface of the upper car 21a.

  A bracket 23 having a predetermined length is attached upward from a side surface common to the attachment surface of the operating body 22 of the car 21a of the lower car 21b. A first switch 24b is attached at a position of a distance L2b from the upper surface of the car 21b of the bracket 23, and a second switch 24b is attached at a position of a distance L2a from the upper surface of the car 21b.

  These switches 24a detect that when the two cars 21a and 21b approach each other and come into contact with the operating body 22 attached to the car 21a, the switch 24a detects that the first relative distance that is abnormally approached has been reached. An approach signal is output to the elevator control device 25. Further, the switch 24b detects that the two relative distances that are abnormally approached when the two cars 21a and 21b approach and contact the operating body 22 attached to the car 21a. An approach signal is output to the elevator control device 25.

  The elevator control device 25 has an operation for determining a mode for restricting the operation of the passenger cars 21a and 21b based on the traveling directions of the upper and lower passenger cars 21a and 21b and the detection signals from the switches 24a and 24b. Control means 25a is provided. The detection signals from the switches 24a and 24b are sent to the elevator control device 25 through the tail cord 26.

  By the way, the reason why the operating body 22 having the length L is provided in the upper car 21a as described above and the proximity switches 24a and 24b are provided in the distance corresponding to L2a and L2b of the bracket 23 of the lower car 21b is as follows. Is to satisfy.

(B) When the two cars 21a and 21b are traveling in directions approaching each other, as is apparent from the calculation formula (1) described above, to stop one car 21a or 21b. It is necessary to secure twice the distance required for

(B) When the two cars 21a and 21b are traveling in the same direction, they may gradually approach due to a relative speed difference. In such a case, for example, both the cars 21a and 21b are traveling upward, but when the traveling speed of the lower car 21b is high, the lower car 21b is decelerated or the upper car 21a is accelerated. By doing so, it is possible to avoid contact between the cars 21a and 21b. As described above, safety can be ensured even when the relative distance is relatively short as compared with the case where the two cars 21a and 21b are traveling in directions approaching each other.

Next, the operation of the apparatus shown in FIG. 3 realized under the above conditions will be described.
When the two cars 21a and 21b approach each other, when the operating body 22 of the upper car 21a presses the proximity switch 21a of the lower car 21b, the proximity switch 24a is set to the first abnormal approach. 1 is detected, and an abnormal approach signal is output to the elevator controller 25. At this time, the distance at which the proximity switch 24a operates is L1 + L2a. However, when the two cars 21a and 21b are traveling in a direction approaching each other, the cars 21a and 21b stop each other. This is equivalent to the distance required for this. Accordingly, when the operation control means 25a receives an abnormal approach signal from the proximity switch 24a while the two cars 21a and 21b are traveling in directions approaching each other, the operation control means 25a immediately stops the two cars 21a and 21b. A control signal for outputting is output.

  On the other hand, when the actuating body 22 of the upper car 21a presses the proximity switch 24b of the lower car 21b, it detects that the second relative distance, which is the second abnormal approach, is reached from the proximity switch 24b. An approach signal is output to the elevator control device 25. At this time, the distance at which the proximity switch 24b operates is L1 + L2b, but this distance is a distance necessary for taking some measures when the two cars 21a and 21b are traveling in the same direction.

  Therefore, when the operation control means 25a of the elevator controller 25 receives an abnormal approach signal from the proximity switch 24b while the two cars 21a and 21b are traveling in the same direction, for example, both the cars 21a and 21b When traveling on the upper side, if the traveling speed of the lower car 21b is high, the lower car 21b is decelerated or if the upper car 21a is accelerated, the mutual car 21a, 21b It is possible to avoid contact.

  Therefore, according to the embodiment as described above, one of the upper and lower two cars 21a and 21b is set to the protruding distance L2b and L2a from the car 21a or 21b. The switches 24b and 24a are provided, and the operating body 22 having a protruding distance L1 from the car 21b or 21a is attached to the other car 21b or 21a. When the two cars 21a and 21b are traveling in directions approaching each other, it can be reliably detected that the switch 24a is abnormally approaching the relative distance L1 + L2a that can be avoided by the switch 24a.

  Further, when the two cars 21a and 21b are approaching while traveling in the same direction, it is possible to reliably detect that they are abnormally approaching the relative distance L1 + L2b that can be avoided by the switch 24b.

(Embodiment 3)
FIG. 4 is a schematic configuration diagram showing another embodiment of the safety device for a multi-car elevator according to the present invention.

  In this multi-car elevator, two cars 31a and 31b are provided so as to be able to run in the vertical direction independently in a hoistway (not shown). In addition, each hoisting machine (not shown) is installed in the upper part of the hoistway at a position where it does not interfere with the upper and lower two cars 31a and 31b traveling in the hoistway. Each car 31a, 31b is suspended from one end of a main loaf (not shown) wound around these hoisting machines.

  In addition, governor sheaves 32a, 32a, 32b, and 32b (lower governor sheaves 32a and 32b are not shown) are disposed at the upper and lower portions of the hoistway with an interval that covers the traveling range of each of the cars 31a and 31b. Governor ropes 33a and 33b are looped over the governor sheaves 32a, 32a, 32b and 32b, respectively. Governor ropes 33a and 33b are fixed to the respective cars 31a and 31b via links 34a and 34b, respectively.

  Thus, since the governor sheaves 32a, 32a, 32b, 32b are connected to the car 31a, 31b, the governor sheaves 32a, 32a, 32b, 32b rotate at a speed corresponding to the traveling speed of the car 31a, 31b. To do. Therefore, when the cars 31a and 31b reach a speed equal to or higher than a preset traveling speed, the governor sheaves 32a, 32a, 32b, and 32 stop rotating. As a result, braking force acts on the cars 31a and 31b via the links 34a and 34b, so that a brake device (not shown) inside the cars 31a and 31b operates and stops.

  In the present apparatus, the relative distances at which the two cars 31a and 31b are abnormally close to the predetermined positions of the governor rope 33a connected to the upper car 31a and the governor rope 33b connected to the lower car 31b. A set of switches 36a and 36b including a contact that operates when approaching is attached. When the switches 36a and 36b come into contact with each other, the switches 36a and 36b send to the elevator control device (not shown) that the relative distance that is abnormally approached has been reached. The elevator control device can be configured as shown in FIG. 3, for example, and has built-in operation control means for limiting the speed of the cars 31a and 31b.

  As the switches 36a and 36b, a switch that detects the relative distance between the cars 31a and 31b, such as a contact switch shown in FIG. 3, a proximity switch 6 using a permanent magnet, or an optical switch, is used. In FIG. 4, a pair of switches 36a and 36b is used. However, a switch is provided so as to detect the first relative distance and the second relative distance based on the same idea as in FIG. It may be.

  Therefore, according to the embodiment as described above, the switches 36a and 36b are provided at predetermined positions of the governor ropes 33a and 31b connected to the passenger cars 31a and 31b, and when the switches 36a and 36b come into contact, abnormal approach It is possible to reliably detect that the relative distance is reached. As a result, contact between the cars 31a and 31b can be avoided beforehand by decelerating, accelerating or stopping the operation of the cars 31a and 31b.

  In the above-described embodiment, the switches 36a and 36b are provided on the governor ropes 33a and 31b. However, for example, the switches 36a and 36b may be provided on the main rope or the compen- sion rope.

  In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the summary, various deformation | transformation can be implemented. Moreover, each embodiment can be implemented in combination, and in that case, the effect of the combination can be obtained.

1 is a schematic front view showing an embodiment of a safety device for a multi-car elevator according to the present invention. 1 is a schematic top view showing an embodiment of a safety device for a multi-car elevator according to the present invention. The schematic block diagram which shows other embodiment of the safety device of the multi-car elevator which concerns on this invention. The schematic block diagram which shows other embodiment of the safety device of the multi-car elevator which concerns on this invention. The figure explaining the safety device of the conventional multi-car elevator. The figure explaining the safety device of the conventional multi-car elevator.

Explanation of symbols

  1a, 1b, 21a, 21b, 31a, 31b ... Riding car, 2a, 2b ... Hoisting machine, 3a, 3b ... Main rope, 4a, 4b ... Under car sheave, 6a, 6b ... Speed detector, 7, 25 ... Elevator control device, 8a, 8b ... absolute position detecting means, 9 ... relative distance calculating means, 10, 25a ... operation control means, 11a, 11b, 32a, 32b ... governor sheave, 12a, 12b, 33a, 33b ... governor rope, 22 ... actor, 23 ... bracket, 24a, 24b ... switch, 36a, 36b ... switch.

Claims (6)

Absolute position detecting means for detecting the absolute position of each car of a multi-car elevator provided so that two or more cars can run in the hoistway;
Relative distance calculating means for calculating the relative distance of each car from the absolute position of each car detected by the car absolute position detecting means;
A multi-car elevator safety device comprising: an operation control means for limiting a speed of the car when a relative distance between the cars approaches a predetermined distance or less. The safety device for a multi-car elevator according to claim 1,
The absolute position detection means is provided in a hoisting machine that drives each car or a governor sheave that stops rotating when each car reaches a speed equal to or higher than a predetermined speed, and each hoisting machine or each governor sheave A multi-car elevator safety device comprising a rotation speed detector that detects the rotation speed of the vehicle and outputs the rotation speed to the absolute position detection means. When two or more cars in a hoistway are provided in each car of a multi-car elevator provided to be able to run, and when each car is running in a direction approaching each other, A relative distance detection hand for detecting the first and second relative distances set in correspondence with each other when traveling in the same direction and approaching;
A multi-car elevator safety device comprising: an operation control means for restricting the operation of each of the cars when it is detected that the first or second relative distance is approached. The multi-car elevator safety device according to claim 3,
The relative distance detecting means is attached to one of the cars, and an operating body having a predetermined first length in the direction of the other car from one car surface, and the other car Is attached to the other car and protrudes in the direction of the car from the other car and is provided at a position having a predetermined first and second distance (first distance <second distance). And the second switch and each of the cars traveling in the same direction and approaching each other, the first relative when the operating body of the one car operates the first switch. When the means for detecting that the distance is close and each of the cars are approaching in the same direction, the second switch is operated when the operating body of the one car operates the second switch. Means to detect approaching relative distance Safety device for a multi-car elevator, characterized in that it comprises a. In the safety | security apparatus of the multi-car elevator of Claim 3 or Claim 4,
The operation control means stops the operation of the upper and lower cars when the relative distance detection means detects that each of the cars has approached the first relative distance, and the relative distance detection means A safety device for a multi-car elevator, wherein the operation of the car is restricted so that the relative distance between the upper and lower cars is increased when it is detected that each car has approached the second relative distance. . Provided on a main rope or governor rope wrapped around a hoisting machine or governor sheave that moves up and down according to the traveling of each car of a multi-car elevator provided so that two or more cars can run in the hoistway, A relative distance detecting means for detecting that each of the cars has reached a predetermined relative distance;
A safety device for a multi-car elevator, comprising: an operation control means for restricting the traveling of the car when the relative distance detecting means detects that a predetermined relative distance has been reached.

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