Main rope sway suppression device

Abstract

To provide a main rope swing suppression device that can smoothly suppress the lateral swing of the main rope. [Solution] The main rope sway suppression device 30 is attached to the car-side main rope group 12A above the elevator car 14 and includes a connector 34 to which one end of a sway suppression rope 52 that suppresses the sway of the car-side main rope group 12A is connected, a pulley 44 provided at the same height as the connector 34, and a traction unit 70 that pulls the sway suppression rope 52, which is stretched over the pulley 44 while connected to the connector 34, downward. The traction unit 70 is provided with a slack suppression mechanism 80 that suppresses slack in the sway suppression rope 12 by applying a preload in a predetermined direction.

Description

Technical Field

[0001] The present invention relates to a device for suppressing the sway of a main rope, and more particularly to a device for suppressing the sway of a main rope that occurs due to the sway of a building in which an elevator is installed caused by an earthquake or the like.

Background Art

[0002] In a rope-type elevator installed in a high-rise building, in many cases, a machine room is provided directly above the upper part of the hoistway of the car, and a hoisting machine for driving the car is installed in the machine room. A main rope is hung on a sheave that forms part of this hoisting machine. A car is connected to one end side of the main rope, and a counterweight is connected to the other end side, and each is suspended by the main rope. Then, by rotating the sheave of the hoisting machine forward or backward, the car guided by a pair of car guide rails laid in the vertical direction is configured to move up and down.

[0003] In an elevator having such a configuration, for example, when the building shakes due to long-period seismic motion, the main rope that suspends the car from the top of the building also experiences horizontal sway (hereinafter, this horizontal sway of the main rope is referred to as "lateral sway") in substantially the same direction as the sway of the building.

[0004] Conventionally, the magnitude of the sway of the main rope is estimated from the magnitude of the sway of the building sensed by a long-period vibration sensor installed in the building, and according to the degree of the magnitude of the sway of the main rope, the elevator is controlled for operation, such as temporarily stopping the operation of the elevator.

[0005] However, there is a problem in that even after the building's vibrations subside, normal elevator operation cannot be resumed until the main rope's vibrations have stabilized. Furthermore, if the main rope resonates with the frequency of building vibrations caused by earthquakes or strong winds, the main rope's vibrations may become larger. In such cases, the main rope may come into contact with and damage equipment installed in the elevator shaft. If equipment is damaged, repair work by maintenance personnel will be required, which will result in a longer period before normal operation can be resumed.

[0006] In this regard, Patent Document 1 discloses a device for suppressing the lateral sway of a main rope, in which a connector attached to the main rope is stretched across a pulley mounted at the same height as the connector, and the lateral sway of the main rope is suppressed by pulling the other end of a sway-suppressing rope, one end of which is connected to the connector, to pull the main rope horizontally. It also discloses a tension-applying mechanism that suppresses slack in the sway-suppressing rope by biasing the sway-suppressing rope located between the connector and the pulley in a downward direction via a tension-applying pulley. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2021-187665 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] In the sway suppression device described in Patent Document 1, the sway suppression rope is biased via a tension-applying pulley in a direction perpendicular to the pulling direction of the sway suppression rope. Therefore, if the sway suppression rope comes off the tension-applying pulley, it becomes impossible to prevent the slack in the sway suppression rope. In such cases, slack occurs in the sway suppression rope, which presents a problem in that the lateral sway of the main rope cannot be smoothly suppressed.

[0009] The present invention aims to provide a main rope swing suppression device that can smoothly suppress the lateral swing of the main rope. [Means for solving the problem]

[0010] The present invention provides a main rope sway suppression device that suppresses the sway of a main rope when sway occurs in the main rope that suspends an elevator car, and comprises a connector attached to the main rope above the elevator car, a pulley provided at the same height as the connector, and a traction unit that pulls a sway suppression rope stretched over the pulley while connected to the connector in a predetermined direction, wherein the traction unit is provided with a slack suppression mechanism that suppresses slack in the sway suppression rope by applying a preload in a predetermined direction.

[0011] In the main rope sway suppression device of the present invention, the slack suppression mechanism may be configured to pull the sway suppression rope in a predetermined direction using a spring.

[0012] In the main rope sway suppression device of the present invention, the slack suppression mechanism may be configured to pull the sway suppression rope in a predetermined direction using a weight. [Effects of the Invention]

[0013] According to the main rope sway suppression device of the present invention, a slack suppression mechanism is provided that applies a preload to the sway suppression rope in the same direction as the predetermined direction in which the traction unit pulls the sway suppression rope. Therefore, the occurrence of slack can be suppressed throughout the entire length of the sway suppression rope. As a result, slack is less likely to occur in the sway suppression rope, and the lateral sway of the main rope can be smoothly suppressed. [Brief explanation of the drawing]

[0014] [Figure 1] This is an overall configuration diagram of an elevator to which a main rope sway suppression device, which is one embodiment of the present invention, is applied. [Figure 2]Figure 2(a) is a perspective view of the main rope sway suppression device included in Figure 1. Figure 2(b) is a plan view of the main rope sway suppression device shown in Figure 2(a). [Figure 3] Figure 3 is a side view showing the overall configuration of the main rope sway suppression device. [Figure 4] Figure 4(a) schematically shows the configuration of the actuator when the drive-side sway suppression rope is not being pulled, and Figure 4(b) schematically shows the configuration of the actuator when the drive-side sway suppression rope is being pulled. [Figure 5] Figure 5(a) shows the configuration of a modified slack suppression mechanism. Figure 5(b) shows the state in which the slack in the drive-side sway suppression rope is suppressed by the downward movement of the weight in the slack suppression mechanism shown in Figure 5(a). [Figure 6] This figure shows the state in which the arm of the modified slack suppression mechanism moves downward, thereby pulling the rope for suppressing drive-side sway. [Modes for carrying out the invention]

[0015] The following describes an elevator 10 to which a main rope sway suppression device, which is one embodiment of the present invention, is applied, with reference to the drawings. In each figure, "X" indicates the horizontal direction X which is approximately parallel to the longitudinal direction of the upper beam 14A-1, "Y" indicates the horizontal direction Y which is perpendicular to the horizontal direction X, and "Z" indicates the vertical direction Z which is perpendicular to the horizontal directions X and Y, respectively. In addition, the horizontal direction X may be referred to as the X direction and the horizontal direction Y as the Y direction as needed.

[0016] FIG. 1 is a diagram showing a schematic configuration of an elevator 10. In FIG. 1, for simplicity of illustration, the main rope group 12 is shown as a single rope. As shown in FIG. 1, the elevator 10 is a traction-type rope elevator. A car frame 14A that supports a car 14 is suspended from one end side of a main rope group 12 composed of a plurality of main ropes 12-1, 12-2, 12-3, … (see FIG. 2), and a counterweight 15 is suspended from the other end side. A main rope swing suppression device (hereinafter referred to as “swing suppression device”) 30 is attached to the car frame 14A. Further, the car 14 is configured to be able to move up and down in the vertical direction Z along a pair of guide rails (not shown) provided on the wall surface of the hoistway 17 corresponding to the car 14. Similarly, the counterweight 15 is also provided so as to be able to move up and down in the vertical direction Z along a pair of guide rails (not shown) provided corresponding to the counterweight 15.

[0017] Furthermore, one end of a compensation rope 16 having a function of compensating for the imbalance of the weight of the main rope group 12 whose suspended weight varies depending on the up and down position of the car 14 is connected to the car frame 14A. This compensation rope 16 is stretched over a deflector sheave 19 installed in a pit 17-1 at the bottom of the hoistway 17, and the other end side is connected to the lower end of the counterweight 15.

[0018] The main rope group 12 is stretched over a winding drum 18A and a deflecting sheave 18B of a hoisting machine 18 installed in a machine room M directly above the hoistway 17, and has a function of relatively moving up and down the car 14 and the counterweight 15 by rotating the winding drum 18A forward or backward by a hoisting machine motor (not shown). In addition, a control unit 20 for comprehensively controlling the operation of the hoisting machine 18 and the operation of the swing suppression device 30 is provided in the machine room M. In this embodiment, the operation of the swing suppression device 30 is controlled by the control unit 20 provided in the machine room M, but the present invention is not limited to this. For example, a control unit for controlling the operation of the swing suppression device 30 may be provided on the upper surface 14R of the car 14.

[0019] In the following description, the portion of the main rope group 12 that suspends the car 14 is referred to as the car-side main rope group 12A, and the portion that suspends the counterweight 15 is referred to as the counterweight-side main rope group 12B as necessary. According to the above definition, the lengths of the car-side main rope group 12A and the counterweight-side main rope group 12B in the main rope group 12 vary depending on the ascending and descending positions of the car 14. Here, the car-side main rope group 12A indicated by the dashed line in FIG. 1 schematically shows an example of the state when the car-side main rope group 12A undergoes lateral sway (detailed later).

[0020] FIG. 2(a) is a perspective view of the sway suppression device 30. FIG. 2(b) is a plan view of the sway suppression device 30. In FIG. 2(b), in order to avoid frequent illustration, the illustration of the car-side main rope group 12A below the upper beam 14A-1 and the coupler 34 is omitted, and the cross-sectional hatching of the car-side main rope group 12A is omitted. FIG. 3 is a view showing the side configuration of the sway suppression device 30. In FIG. 3, the arrangement configuration of the actuator 73 built in the traction unit 70 is shown by a dashed line.

[0021] As shown in FIGS. 2(a) to 3, the sway suppression device 30 has a function of suppressing the lateral sway of the car-side main rope group 12A when the car-side main rope group 12A sways in the horizontal direction (hereinafter, the sway of the car-side main rope group 12A in this horizontal direction is referred to as "lateral sway"). The sway suppression device 30 includes a support 32, a coupler 34 attached to the car-side main rope group 12A located above the car 14, and two sway suppression units 40, 42 that suppress the lateral sway of the car-side main rope group 12A.

[0022] The support 32 is attached to the upper beam 14A-1 that forms a part of the car frame 14A, and is a structure having a substantially square frame shape in a top view provided so as to surround the car-side main rope group 12A.

[0023] As shown in Figures 2(a) to 3, the vibration suppression units 40 and 42 are arranged so as to be orthogonal to each other in a top view. Since the vibration suppression units 40 and 42 have almost identical configurations, the following description will mainly focus on vibration suppression unit 40, and the description of vibration suppression unit 42 will be omitted as appropriate.

[0024] As shown in Figures 2(a) to 3, the sway suppression unit 40 has the function of suppressing the lateral sway of the car-side main rope group 12A via sway suppression ropes 52 and 54 connected to the connector 34. The sway suppression unit 40 comprises pulleys 44 and 46 that face each other with the connector 34 in between and are installed at the same height as the connector 34, a traction unit 70 configured to be able to pull the sway suppression rope 52 stretched across the pulley 44, and an elastic unit 49 connected to one end of the sway suppression rope 54 stretched across the pulley 46.

[0025] The traction unit 70 includes a housing 72 having a vertically elongated box-like external shape and an actuator 73 housed in the housing 72. The actuator 73 is a linear actuator, either electrically or hydraulically operated, and has the function of pulling the sway suppression rope 52 downward (in a predetermined direction).

[0026] In the following description, the portion of the sway suppression rope 52 located on the connector 34 side of the pulley 44 will be referred to as the connector-side sway suppression rope 52A, and the portion located on the traction section 70 side of the pulley 44 will be referred to as the drive-side sway suppression rope 52B as appropriate, as needed.

[0027] Furthermore, the vibration suppression unit 40 includes pivoting mechanisms 60 and 61 that rotatably support both pulleys 44 and 46, respectively. In the following description, since the configuration of each pivoting mechanism 60 and 61 is the same, the description will mainly focus on the configuration of pivoting mechanism 60, and the description of pivoting mechanism 61 will be omitted as appropriate.

[0028] As shown in Figures 2(a) and 2(b), the rotating mechanism 60 includes a base 62 attached to an upper frame 32-1 which constitutes part of the support 32, and a movable base 64 which is rotatably supported on the base 62 along the horizontal direction. More specifically, the movable base 64 is rotatably supported on the base 62 via a cylindrical shaft 63 which will be described in detail later. The movable base 64 is also equipped with a support part 44-1 that pivotally supports the pulley 44 described above. The base 62 and the movable base 64 are each composed of plates that have a substantially rectangular shape in plan view.

[0029] With the above configuration, when the vibration suppression rope 52 pulls the connector 34 (see Figure 3), the pulley 44 can be rotated according to the position of the connector 34. Therefore, the force with which the traction unit 70 pulls the drive-side vibration suppression rope 52B can be smoothly applied to the connector 34 via the connector-side vibration suppression rope 52A.

[0030] As shown in Figures 2(a) and 2(b), the cylindrical shaft 63 has a hollow structure 63A in the center of the shaft that is roughly annular in plan view, and is attached so as to penetrate the base 62 and the movable base 64 in the thickness direction. The cylindrical shaft 63 has the role of rotatably supporting the movable base 64 on the base 62, as shown by the dashed-dotted and double-dotted lines in Figure 2(b). In addition, the drive-side sway suppression rope 52B is inserted through the cylindrical shaft 63 and is positioned to extend from the traction section 70 toward the pulley 44.

[0031] Here, the mounting position of the cylindrical shaft 63 to the movable base 64 and the base 62 is preferably set such that the hollow structure 63A is located where the drive-side sway suppression rope 52B extends from the pulley 44 toward the traction section 70, while the drive-side sway suppression rope 52B is applying tension to the connector 34.

[0032] As a result, as shown by the dashed and double-dotted lines in Figure 2(b), the pivot point of the movable platform 64 when it rotates can be positioned around the vertically extending drive-side sway suppression rope 52B (see Figure 2(a)) in a plan view. Therefore, when the movable platform 64 equipped with the pulley 44 rotates, the horizontal displacement of the drive-side sway suppression rope 52B is reduced, and the lateral sway of the drive-side sway suppression rope 52B associated with the rotation of the pulley 44 can be suppressed. As a result, it is possible to prevent the drive-side sway suppression rope 52B from slackening or falling off the pulley 44 as the pulley 44 rotates.

[0033] Figure 4(a) schematically shows the configuration of the actuator 73 when the drive-side sway suppression rope 52B is not being pulled, and Figure 4(b) schematically shows the configuration of the actuator 73 when the drive-side sway suppression rope 52B is being pulled. As shown in Figures 4(a) and 4(b), the actuator 73 has a main body 74A, an arm 74B configured to extend and retract vertically relative to the main body 74A, and a slack suppression mechanism 80.

[0034] As shown in Figure 4(a), the slack suppression mechanism 80 includes a lever 74C attached perpendicularly to the tip of the arm 74B, an annular base 74D, and an elastic spring 75, and plays a role in suppressing slack in the sway suppression rope 52B by constantly pulling the sway suppression rope 52B downward. A threaded portion 52E is attached to one end of the drive-side sway suppression rope 52B by crimping or the like.

[0035] Nuts NT1 and NT2 are screwed onto the threaded portion 52E, with the nuts inserted through the through hole H1 provided in the lever 74C and the annular base 74D directly below it. Both nuts NT1 and NT2 are attached in a double-nut system to prevent loosening of the threaded portion 52E, and by engaging with the annular base 74D, they serve to fix the drive-side vibration suppression rope 52B to the annular base 74D. An elastic spring 75 is installed in a compressed state between the annular base 74D and the lever 74C, and the vibration suppression rope 52B is held in a downward position by the elastic force of this elastic spring 75.

[0036] With the above configuration, the slack suppression mechanism 80 constantly applies a tensile force to the sway suppression rope 52B even when the arm 74B is not moving downward, in other words, when the actuator 73 is not pulling the sway suppression rope 52B. As a result, a preload can be applied by pulling the drive-side sway suppression rope 52B in the same direction as the pulling section 70 pulls the sway suppression rope 52, thereby effectively suppressing slack in the sway suppression rope 52B regardless of the drive state of the actuator 73.

[0037] Furthermore, since the elastic force of the elastic spring 75 also acts on the coupling side vibration suppression rope 52A (see Figure 3) via the drive side vibration suppression rope 52B, slack in the coupling side vibration suppression rope 52A can also be effectively suppressed.

[0038] In this embodiment, the car-side main rope group 12A is pulled using the swing suppression ropes 52 and 54, but it is also possible to pull the car-side main rope group 12A using only the swing suppression rope 52. In this case as well, the swing of the car-side main rope group 12A can be suppressed by the pulling unit 70 pulling the swing suppression rope 52.

[0039] Furthermore, as shown in Figure 2(a), the pulley 44 may be equipped with retaining clips 44A, 44B, and 44C to prevent the swing-suppressing rope 52 from falling off. This makes it possible to more reliably prevent the swing-suppressing rope 52 from falling off the pulley 44. The pulley 46 has the same configuration as the pulley 44.

[0040] Furthermore, each of the main ropes 12-1, 12-2, 12-3, ... that constitute the cage-side main rope group 12A is inserted through a through hole provided in the connector 34, corresponding to each of the main ropes 12-1, 12-2, 12-3, ... Here, each of the main ropes 12-1, 12-2, 12-3, ... may be made movable in the vertical direction Z relative to the connector 34, or they may be fixed to the connector 34 using fixing fittings such as bolts.

[0041] As shown in Figure 2(b), it is preferable that the swing-suppressing ropes 52 and 54 are connected to the connector 34 at one end via joints 34A and 34B, which are rotatable around an axis substantially parallel to the vertical Z direction. By using joints 34A and 34B in this way, the bending force acting on the swing-suppressing ropes 52 and 54 when the car-side main rope group 12A is swinging laterally can be mitigated. Universal joints may also be used as joints 34A and 34B.

[0042] Furthermore, the other end of the sway-suppressing rope 54, which is stretched across the pulley 46, is connected to an elastic unit 49 attached to the side of the support 32 directly below the pulley 46. This elastic unit 49 houses a spring (not shown), and tension is applied to the sway-suppressing rope 54 by pulling it downwards due to the elastic force of the spring.

[0043] Through the aforementioned elastic unit 49 and elastic spring 75, tension is applied to the entire range of the swing suppression ropes 52 and 54, regardless of whether the car-side main rope group 12A is swinging laterally or not. As a result, slack in the swing suppression ropes 52 and 54 is suppressed.

[0044] Furthermore, the connector 34 is pulled in opposite directions to each other via the sway-suppressing ropes 53 and 55, in a direction substantially parallel to the horizontal direction Y. In this way, the connector 34 is configured to be held at the origin position P in the center of the support 32 while being pulled in directions substantially parallel to the horizontal direction X and the horizontal direction Y, respectively.

[0045] As described above, the traction unit 70 and the elastic unit 49 hold the sway suppression ropes 52 and 54 in a state where they are pulled in opposite directions, thus suppressing slack and bending of the sway suppression ropes 52 and 54.

[0046] In this embodiment, the vibration suppression unit 40 is equipped with an elastic unit 49, but a traction unit having the same configuration as the traction unit 70 may be provided instead of the elastic unit 49. In this case, the same effect as in this embodiment can be obtained by the traction mechanism pulling the vibration suppression rope 54.

[0047] The traction unit 70 is attached to the side of the support 32 and has the function of pulling the swing suppression rope 52 when the car-side main rope group 12A swings laterally. By attaching the traction unit 70 to the side of the support 32 rather than the top surface 14R of the elevator car 14 in this way, the driving noise of the traction unit 70 is less likely to be transmitted inside the elevator car 14.

[0048] Furthermore, the control unit 20 (see Figure 1) detects the swing of the car-side main rope group 12A via multiple rope swing detection sensors (not shown) installed in the elevator shaft 17, and controls the operation of the swing suppression device 30 to suppress the lateral swing of the car-side main rope group 12A based on the detection results. More specifically, the control unit 20 can control the swing suppression units 40 and 42 to excite the car-side main rope group 12A, in other words, to cause it to swing laterally, in response to the incident wave, which is the lateral swing of the car-side main rope group 12A caused by building sway, so that a reflected wave is generated that cancels out the incident wave. This makes it possible to suppress the lateral swing of the car-side main rope group 12A.

[0049] Regarding the operation control of the swing suppression device 30 in the control unit 20 (see Figure 1), an appropriate operation pattern for suppressing the lateral swing of the car-side main rope group 12A may be calculated in advance using simulations or the like and used. Alternatively, an appropriate operation pattern for suppressing the lateral swing of the car-side main rope group 12A may be calculated experimentally by operating the swing suppression device 30 while the car-side main rope group 12A is actually swinging laterally.

[0050] In this embodiment, the control unit 20 determines the position where the swing amplitude of the car-side main rope group 12A is maximum in the vertical Z direction, based on the position information of the car-side main rope group 12A obtained from a rope swing detection sensor (not shown). The control unit 20 then calculates the X and Y components of the swing amplitude of the rope group 12A at the position where the swing amplitude is maximum, and controls the drive of the swing suppression device 30 based on the magnitude of these X and Y components.

[0051] More specifically, the control unit 20 controls the drive of the sway suppression unit 40 based on the X-direction component described above, and controls the drive of the sway suppression unit 42 based on the Y-direction component described above. In this way, the X-direction and Y-direction components of the lateral sway of the main rope group 12A on the car side are suppressed separately by the sway suppression units 40 and 42, respectively.

[0052] According to the main rope sway suppression device 30 of this embodiment, a slack suppression mechanism 80 is provided that constantly applies a preload to the sway suppression rope 52 in the same direction as the predetermined direction in which the traction unit 70 is pulling the sway suppression rope 52. Therefore, slack in the sway suppression rope 52 can be suppressed over its entire length. As a result, slack is less likely to occur in the sway suppression rope 52, and the sway suppression rope 52 can be appropriately pulled in conjunction with the traction unit 70. As a result, lateral sway of the cage-side main rope group 12A can be smoothly suppressed.

[0053] In this embodiment, an example is given in which the lateral sway of the car-side main rope group 12A is suppressed by arranging the sway suppression units 40 and 42 orthogonally. However, the sway suppression device 30 may be equipped with only one of the sway suppression units 40 or 42. In this case as well, it is possible to suppress the lateral sway of the car-side main rope group 12A.

[0054] In the above embodiment, a configuration was described in which a slack suppression mechanism 80 is provided in the traction section 70 to suppress slack in the swing suppression rope 52 by the elastic force of an elastic spring 75. However, the present invention is not limited thereto. For example, instead of the slack suppression mechanism 80, a slack suppression mechanism 90 that uses a weight to suppress slack in the swing suppression rope 52 may be provided in the traction section 70. The configuration of the slack suppression mechanism 90 according to this modified example will be explained using Figures 5(a) and 5(b). In the following description, parts that have the same configuration as the above embodiment will be indicated by the same reference numerals as appropriate and their explanations will be omitted, and only parts with different configurations will be explained.

[0055] Figure 5(a) shows the configuration of the slack suppression mechanism 90. Figure 5(b) shows the state in which the slack of the drive-side sway suppression rope 52B is suppressed by the downward movement of the weight 94 of the slack suppression mechanism 90 shown in Figure 5(a). As shown in Figures 5(a) and 5(b), the slack suppression mechanism 90 includes plates 91 and 92 arranged vertically, and support columns 93A and 93B connecting the plates 91 and 92. The plates 91 and 92 are supported on the side portion of the support body 32 (see Figure 3). A lever 74E and weights 94A, 94B, 94C, ... are inserted into each of the support columns 93A and 93B in a stacked state so as to be movable in the vertical direction. Lever 74E is formed to be longer than lever 74C in the above embodiment, and has substantially the same configuration as lever 74C except that it is provided with through holes C1 and C2 for inserting support columns 93A and 93B and a through hole C3 for inserting the drive-side sway suppression rope 52B.

[0056] Here, since the configurations of weights 94A, 94B, and 94C are all identical, the following explanation will mainly focus on weight 94A, and the explanations for the other weights 94B and 94C will be omitted as appropriate. Also, when there is no need to distinguish weight 94A from the other weights 94B and 94C, it will be referred to as "weight 94" as appropriate. Weight 94A is provided with through holes H2 and H4 for inserting the support columns 93A and 93B, and a through hole H3 for inserting the drive-side sway suppression rope 52B.

[0057] Furthermore, one end of the drive-side sway suppression rope 52B is inserted through a through hole 91A in the plate 91 and a through hole C3 in the lever 74E, and is also inserted through a through hole H3 in the center of the weight 94, and is engaged or connected to the weight 94 located at the lowest end via a nut NT3. This allows a preload to be constantly applied to the drive-side sway suppression rope 52B by the weight of the weight 94.

[0058] Figure 6 shows the state in which the arm 74B of the slack suppression mechanism 90 is moving downward, pulling the drive-side sway suppression rope 52B. As shown in Figure 6, when the arm 74B moves downward in conjunction with the drive of the actuator 73, the lever 74E attached to the tip of the arm 74B biases the weight 94 downward. Consequently, the drive-side sway suppression rope 52B is pulled downward via the weight 94, and the sway suppression rope 52 pulls the car-side main rope group 12A, thereby suppressing the lateral sway of the car-side main rope group 12A.

[0059] Even when using the modified loosening suppression mechanism 90 in this case, the same effect as the loosening suppression mechanism 80 according to the above embodiment can be obtained.

[0060] The present invention can be implemented in various forms with improvements, modifications, or alterations based on the knowledge of those skilled in the art, without departing from its spirit. Furthermore, the invention may be implemented in a form in which any of its defining features is replaced with other technologies, as long as the same function or effect is achieved. [Explanation of symbols]

[0061] 10 Elevators 12 Main rope groups 12-1, 12-2, 12-3 Main ropes 12A Main rope group on the cage side 12B Main rope group on the counterweight side 14. 14A cage frame 14A-1 Upper beam 30. Swing suppression device (Swing suppression device for the main rope) 32 Support 34 Connectors 34A, 34B fittings 40,42 Vibration suppression unit 44, 45, 46 Pulleys 49 Elastic Units 52, 53, 54, 55 Rope for suppressing sway 60, 61 Rotating Mechanism 62 base 63 Cylindrical shaft 64 Movable platform 70 Traction section 72 cabinets 73 Actuators 74A Main Unit 74B Arm 74C, 74E levers 74D Ring-shaped base 75 Elastic spring 80,90 Sagging suppression mechanism 91,92 Plate 91A through hole 93A,93B Post 94, 94A, 94B, 94C weights C1,C2,C3 through hole H1,H2,H3,H4 through hole X,Y horizontal direction Z vertical direction

Claims

1. A main rope swing suppression device that suppresses the swing of the main rope when swing occurs in the main rope that suspends an elevator car, A connector attached to the main rope above the aforementioned elevator car, A pulley provided at the same height as the aforementioned connector, A traction unit that pulls a swing-suppressing rope, which is stretched across the pulley while connected to the aforementioned connector, in a predetermined direction, Equipped with, The traction unit is provided with a slack suppression mechanism that suppresses slack in the swing suppression rope by applying a preload in the predetermined direction. A device to suppress the swing of the main rope.

2. The slack suppression mechanism is configured to use a spring to pull the swing suppression rope in the predetermined direction. The main rope sway suppression device according to claim 1.

3. The slack suppression mechanism is configured to use a weight to pull the swing suppression rope in the predetermined direction. The main rope sway suppression mechanism according to claim 1.

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