elevator equipment

Abstract

An elevator device according to the present disclosure includes a car; a counterweight; an elongated body that includes a first linear portion that is connected between the car and the counterweight and that is suspended from the car, a second linear portion that is suspended from the counterweight, and a curved portion connecting the first linear portion and the second linear portion; a first roller and a second roller that sandwich the first linear portion of the elongated body to guide the elongated body; and a third roller and a fourth roller that sandwich the second linear portion of the elongated body to guide the elongated body. A rotational axis of the first roller is parallel to a rotational axis of the second roller. Regarding positions in the vertical direction, a vertical position of the rotational axis of the first roller differs from a vertical position of the rotational axis of the second roller. A rotational axis of the third roller is parallel to a rotational axis of the fourth roller. Regarding positions in the vertical direction, a vertical position of the rotational axis of the third roller differs from a vertical position of the rotational axis of the fourth roller.

Description

[Technical Field]

[0001] The present disclosure relates to elevator systems. [Background technology]

[0002] In conventional elevator systems, a long body such as a balancing rope is sometimes suspended between the car and the counterweight to compensate for imbalances in weight between the car and the counterweight due to changes in the car's position (see, for example, Patent Document 1). A tension wheel is suspended from the lowest part of the balancing rope. The load of the tension wheel applies tension to the balancing rope, thereby suppressing vibration of the balancing rope. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2001-247276 Summary of the Invention [Problem to be solved by the invention]

[0004] When the tension load is added to the load of the balancing rope, the load on the connection between the balancing rope and the car increases accordingly, and the load on the connection between the balancing rope and the counterweight also increases. This also increases the load on the drive mechanism and other equipment that drives the car. This leads to an increase in the size of the elevator equipment and the installation space for the equipment, resulting in an increase in the size of the elevator system.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide an elevator system that can prevent the elevator system from becoming larger and can also prevent an increase in lateral sway of a long body suspended between a car and a counterweight. [Means for solving the problem]

[0006] The elevator apparatus according to the present disclosure includes a car, a counterweight, a long body connected between the car and the counterweight and having a first straight section suspended from the car, a second straight section suspended from the counterweight, and a curved section connecting the first straight section and the second straight section, a first roller and a second roller sandwiching the first straight section of the long body to guide the long body, and a third roller and a fourth roller sandwiching the second straight section of the long body to guide the long body, wherein the rotation axis of the first roller is parallel to the rotation axis of the second roller, and with respect to vertical position, the vertical position of the rotation axis of the first roller is different from the vertical position of the rotation axis of the second roller, and the rotation axis of the third roller is parallel to the rotation axis of the fourth roller, and with respect to vertical position, the vertical position of the rotation axis of the third roller is different from the vertical position of the rotation axis of the fourth roller. The tension wheel is not suspended from the elongated body, and the tension wheel is not suspended from the elongated body. The tension wheel further includes a roller support portion that supports the first roller, the second roller, the third roller, and the fourth roller so that the positions of the rotation axes of the first roller, the second roller, the third roller, and the fourth roller do not change in the horizontal direction. It is something. Further, an elevator apparatus according to the present disclosure includes a car, a counterweight, a long body connected between the car and the counterweight and having a first straight section suspended from the car, a second straight section suspended from the counterweight, and a curved section connecting the first straight section and the second straight section, first and second rollers sandwiching the first straight section of the long body to guide the long body, third and fourth rollers sandwiching the second straight section of the long body to guide the long body, fifth and sixth rollers sandwiching the first straight section of the long body to guide the long body, and seventh and eighth rollers sandwiching the second straight section of the long body to guide the long body, wherein the rotation axis of the first roller is parallel to the rotation axis of the second roller, and with respect to a vertical position, the vertical position of the rotation axis of the first roller is The vertical position of the rotation axis of the second roller is different from that of the third roller, and the rotation axis of the third roller is parallel to that of the fourth roller. In terms of vertical position, the vertical position of the rotation axis of the third roller is different from that of the fourth roller. The rotation axis of the fifth roller is perpendicular to the rotation axis of the first roller, and the rotation axis of the fifth roller is parallel to the rotation axis of the sixth roller. In terms of vertical position, the vertical position of the rotation axis of the fifth roller is different from that of the sixth roller. The rotation axis of the seventh roller is perpendicular to the rotation axis of the third roller, and the rotation axis of the seventh roller is parallel to the rotation axis of the eighth roller. In terms of vertical position, the vertical position of the rotation axis of the seventh roller is different from that of the eighth roller. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide an elevator device that can suppress an increase in size of the elevator device and can also suppress an increase in lateral sway of the elongated body suspended between the car and the counterweight. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a configuration diagram showing an elevator device according to a first embodiment. [Figure 2] 1 is a side view showing a main part of a long body guiding device according to Embodiment 1. FIG. [Figure 3] 1 is a perspective view showing a main part of a long body guiding device according to a first embodiment. [Figure 4] FIG. 10 is a diagram for explaining lateral vibrations that occur in the balancing ropes when the car is traveling. [Figure 5] 3 is an explanatory diagram relating to the installation positions of a first roller, a second roller, a third roller, and a fourth roller in the long body guiding device according to the first embodiment. FIG. [Figure 6]3 is an explanatory diagram relating to the installation positions of a first roller, a second roller, a third roller, and a fourth roller in the long body guiding device according to the first embodiment. FIG. [Figure 7] FIG. 10 is a perspective view showing a long body guiding device according to a second embodiment. [Figure 8] 10 is a cross-sectional view illustrating the arrangement of rollers in a long body guiding device according to a second embodiment. FIG. [Figure 9] 10 is a side view illustrating the arrangement of rollers in a long body guiding device according to a second embodiment. FIG. [Figure 10] FIG. 11 is a perspective view showing a long body guiding device according to a third embodiment. [Figure 11] FIG. 11 is a cross-sectional view showing a main part of a long body guiding device according to a third embodiment. [Figure 12] FIG. 11 is a side view showing a state in which the emergency stop device of the elevator system is activated and the lower curved portion of the compensating rope jumps up in the fourth embodiment. [Figure 13] FIG. 10 is a perspective view showing a long body guiding device according to a fourth embodiment. [Figure 14] FIG. 10 is a perspective view showing a state in which the hoisting machine brake or the safety device is activated and the curved portion of the balancing rope jumps up in the long body guiding device according to the fourth embodiment. [Figure 15] FIG. 13 is a perspective view showing a modified example of a long body guiding device according to the fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments will be described with reference to the drawings. Common or corresponding elements in the various drawings will be denoted by the same reference numerals, and descriptions thereof will be simplified or omitted.

[0010] Embodiment 1 Fig. 1 is a configuration diagram showing an elevator apparatus according to a first embodiment. In this disclosure, as shown in Fig. 1, a three-axis Cartesian coordinate system having an X axis, a Y axis, and a Z axis is used, and the positive direction of the X axis is defined as the vertically downward direction. In this disclosure, when the position, shape, orientation, etc. of each component element are mentioned, unless otherwise specified, this refers to the position, shape, orientation, etc. of each part of the elevator apparatus when it is stationary.

[0011] In Fig. 1, a machine room 2 is provided above a hoistway 1 of an elevator system. The machine room 2 is provided with a hoisting machine 4 having a driving sheave 3, a deflector sheave 5 arranged apart from the driving sheave 3, and a control panel 6 corresponding to a control device that controls the operation of the elevator system. A car 7 and a counterweight 8 are provided in the hoistway 1 so that they can move up and down. The hoisting machine 4 corresponds to a drive device that drives the car 7 and the counterweight 8. Note that the elevator system of the present disclosure is not limited to the example shown in the figure, and can also be applied to an elevator system in which the hoisting machine 4 and control panel 6 are arranged in the hoistway 1 and there is no machine room 2.

[0012] A suspension body 9 that suspends a car 7 and a counterweight 8 is wound around the drive sheave 3 and the deflector sheave 5. The car 7 is connected to one end of the suspension body 9. The counterweight 8 is connected to the other end of the suspension body 9. The suspension body 9 is, for example, a rope or a belt. The drive sheave 3 is rotated by the driving force of the motor of the hoisting machine 4. The car 7 and the counterweight 8 each move up and down within the hoistway 1 as the drive sheave 3 rotates. The car 7 and the counterweight 8 move in opposite directions.

[0013] A counter rope 12 is suspended between the car 7 and the counter weight 8. The counter rope 12 corresponds to a flexible long body for compensating for the weight balance. By suspending the counter rope 12 between the car 7 and the counter weight 8, any imbalance in the weight balance between the car 7 side and the counter weight 8 side is compensated. The long body for compensating for the weight balance in the present disclosure is not limited to a rope-like body such as the counter rope 12. The long body in the present disclosure may be, for example, a long body formed by coating a chain with resin. As the long body formed by coating a chain with resin, for example, Whisperflex ("Whisperflex" is a trademark) or the like may be used. The long body for compensating for the weight balance in the present disclosure may also be a belt-like body.

[0014] A car-side rope suspending section 10 is provided on the car 7. The car-side rope suspending section 10 corresponds to the car-side long body suspending section. A counterweight-side rope suspending section 11 is provided on the counterweight 8. The counterweight-side rope suspending section 11 corresponds to the counterweight-side long body suspending section. As shown in Figure 1, the car-side rope suspending section 10 is preferably provided at the bottom of the car 7. The counterweight-side rope suspending section 11 is preferably provided on the side of the counterweight 8.

[0015] One end of the counter rope 12 is connected to the car-side rope suspending section 10. The other end of the counter rope 12 is connected to the counter weight-side rope suspending section 11. The counter rope 12 is suspended between the car-side rope suspending section 10 and the counter weight-side rope suspending section 11 by its own weight alone. In other words, the counter rope 12 does not suspend a tension wheel.

[0016] The counter ropes 12 have a first straight section 15 suspended from the car 7, a second straight section 16 suspended from the counter weight 8, and a curved section 13 connecting the lower ends of the first straight section 15 and the second straight section 16. Specifically, the first straight section 15 is a section that extends vertically downward in a straight line from the car-side rope suspending section 10 to the point where the counter ropes 12 start to curve. Similarly, the second straight section 16 is a section that extends vertically downward in a straight line from the counter weight-side rope suspending section 11 to the point where the counter ropes 12 start to curve. The curved section 13 may be shaped like a semicircle. As described above, in this embodiment, no tension pulley is provided in contact with the curved section 13.

[0017] The horizontal distance between car-side rope suspension section 10 and counterweight-side rope suspension section 11 is called the "suspension point distance" and is represented by the symbol D. The suspension point distance D corresponds to the horizontal distance between the long body suspension sections. The suspension point distance D corresponds to the horizontal distance between the center line of first straight section 15 and the center line of second straight section 16.

[0018] The car 7 and counterweight 8 move up and down while maintaining the value of the suspension point distance D. Below the counterweight ropes 12, a portion of the counterweight ropes 12 is bent to form a curved portion 13. As the car 7 and counterweight 8 move, the counterweight ropes 12 move while maintaining the position where the curved portion 13 is formed, changing the lengths of the first straight portion 15 and the second straight portion 16. That is, when the car 7 descends and the counterweight 8 ascends, the first straight portion 15 shortens and the second straight portion 16 lengthens. At this time, the position and shape of the curved portion 13 are maintained. Similarly, when the car 7 ascends and the counterweight 8 descends, the first straight portion 15 lengthens and the second straight portion 16 shortens. At this time, the position and shape of the curved portion 13 are maintained.

[0019] In the pit portion at the bottom of the hoistway 1, a car shock absorber (not shown) and a counterweight shock absorber (not shown) are installed on the bottom of the hoistway 1. The car shock absorber is a device for mitigating the impact that the car 7 receives when it collides with the floor, i.e., the bottom surface of the hoistway 1. The counterweight shock absorber is a device for mitigating the impact that the counterweight 8 receives when it collides with the floor, i.e., the bottom surface of the hoistway 1. In addition, a long body guide device 14 that guides the counterweight rope 12 is installed at the bottom of the hoistway 1.

[0020] FIG. 2 is a side view showing a main part of the elongated body guiding device 14 according to the first embodiment. FIG. 3 is a perspective view showing a main part of the elongated body guiding device 14 according to the first embodiment. The elongated body guiding device 14 includes a first roller 14a and a second roller 14b. The first roller 14a and the second roller 14b each contact the first straight portion 15 of the balancing rope 12. With the first straight portion 15 of the balancing rope 12 sandwiched between the first roller 14a and the second roller 14b, the first roller 14a and the second roller 14b rotate to guide the balancing rope 12. The rotation axis of the first roller 14a is parallel to the rotation axis of the second roller 14b. With respect to the vertical position, the vertical position of the rotation axis of the first roller 14a is different from the vertical position of the rotation axis of the second roller 14b. The first roller 14a and the second roller 14b correspond to a first roller pair.

[0021] The elongate body guiding device 14 includes a third roller 14c and a fourth roller 14d. The third roller 14c and the fourth roller 14d each contact the second straight portion 16 of the balancing rope 12. With the second straight portion 16 of the balancing rope 12 sandwiched between the third roller 14c and the fourth roller 14d, the third roller 14c and the fourth roller 14d rotate to guide the balancing rope 12. The rotation axis of the third roller 14c is parallel to the rotation axis of the fourth roller 14d. With respect to the vertical position, the vertical position of the rotation axis of the third roller 14c is different from the vertical position of the rotation axis of the fourth roller 14d. The third roller 14c and the fourth roller 14d correspond to the second roller pair.

[0022] The elongate body guiding device 14 includes a roller position fixing member 14i. The roller position fixing member 14i fixes the positions of the rotation axes of the first roller 14a, the second roller 14b, the third roller 14c, and the fourth roller 14d so that they do not move. That is, the roller position fixing member 14i supports each roller so that the positions of the rotation axes of the first roller 14a, the second roller 14b, the third roller 14c, and the fourth roller 14d do not move in any of the X-axis, Y-axis, and Z-axis directions. In this example, the roller position fixing member 14i is fixed to a pit portion. In this embodiment, since the positions of the rotation axes of the first roller 14a, the second roller 14b, the third roller 14c, and the fourth roller 14d are fixed, the shape and size of the curved portion 13 of the counter rope 12 can be reliably maintained when the car 7 and counter weight 8 are raised and lowered. Furthermore, since there is no need for a mechanism for changing the positions of the rotation axes of the first roller 14a, the second roller 14b, the third roller 14c, and the fourth roller 14d, the structure is simplified and the size can be reduced.

[0023] The roller position fixing member 14i corresponds to a roller support part that supports the first roller 14a, the second roller 14b, the third roller 14c, and the fourth roller 14d so that the horizontal positions of the rotation axes of the first roller 14a, the second roller 14b, the third roller 14c, and the fourth roller 14d do not change.

[0024] Each of the first roller 14a, the second roller 14b, the third roller 14c, and the fourth roller 14d may be, for example, a metal roller, a metal roller coated with a resin, a metal roller coated with a rubber, a resin roller, or a rubber roller.

[0025] Each of the first roller 14a, the second roller 14b, the third roller 14c, and the fourth roller 14d may have a bearing on its rotation shaft. The bearing may be a rolling bearing.

[0026] The rotation axes of the first roller 14a, the second roller 14b, the third roller 14c, and the fourth roller 14d are perpendicular to a plane including the curved portion 13. That is, these rotation axes are parallel to the Z-axis direction in FIG. 1 and also parallel to the rotation axis of the traction sheave 3.

[0027] Here, the relationship between the lateral vibration generated in the counter ropes 12 when the car 7 travels and the respective positions of the first roller 14a to the fourth roller 14d will be described with reference to FIG. 4. FIG. 4 is a diagram for explaining the lateral vibration generated in the counter ropes 12 when the car 7 travels. FIG. 4A is a schematic diagram showing a state in which lateral vibration is generated in the counter ropes 12 when the car 7 travels, when the counter ropes 12 are suspended between the car 7 and the counter weight 8 without the long body guide device 14 shown in FIGS. 1 to 3 being installed. When the car 7 travels upward or downward, a pendulum-like lateral vibration is generated below the counter ropes 12 depending on the acceleration / deceleration, as shown in FIG. 4A. Here, the lateral vibration generated in the counter ropes 12 is a vibration generated in the left-right direction within a plane including the curved portion 13, i.e., within the XY plane.

[0028] FIG. 4B is a schematic diagram showing the lateral vibration of the counter ropes 12 when the car 7 travels in a case where only the second roller 14b and the fourth roller 14d of the long-element guide device 14 are installed. When the car 7 travels upward or downward, lateral vibration occurs in the counter ropes 12 due to acceleration or deceleration. The example in FIG. 4B shows a state in which, when lateral vibration occurs in the counter ropes 12, the leftward displacement of the first straight portion 15 of the counter ropes 12 is restrained by the second roller 14b, thereby reducing the pendulum-like displacement. On the other hand, the example in FIG. 4B shows a state in which, because no roller is installed inside the lower curved portion 13 of the counter ropes 12, the inward displacement of the curved portion 13 is not restrained, and the curved portion 13 is displaced inward. Furthermore, when the counter ropes 12 collide with a roller, a local bending displacement occurs in the counter ropes 12, with the roller acting as a fulcrum. This bending displacement becomes a lateral vibration with a short wavelength and propagates through the counter ropes 12.

[0029] FIG. 4C is a schematic diagram showing the state of the balancing ropes 12 when the car 7 is traveling, when the first roller 14a, second roller 14b, third roller 14c, and fourth roller 14d of the elongated body guiding device 14 are installed. The effect of arranging four rollers as shown in FIG. 4C will be explained. When lateral vibration occurs in the balancing ropes 12, as explained using FIG. 4B, the second roller 14b, which is arranged on the outside of the lower curved portion 13 of the balancing ropes 12, restrains the leftward displacement of the first straight portion 15 of the balancing ropes 12. The fourth roller 14d restrains the rightward displacement of the second straight portion 16 of the balancing ropes 12. The first roller 14a restrains the rightward displacement of the first straight portion 15 of the balancing ropes 12 and regulates the hanging shape of the balancing ropes 12 so that the first straight portion 15 is vertical. That is, the first roller 14a regulates the hanging shape of the balancing ropes 12 so that the first straight portion 15 is maintained at a right angle to the YZ plane. The third roller 14c restrains the leftward displacement of the second straight portion 16 of the balancing ropes 12 and regulates the hanging shape of the balancing ropes 12 so that the second straight portion 16 is vertical. That is, the third roller 14c regulates the hanging shape of the balancing ropes 12 so that the second straight portion 16 is maintained at a right angle to the YZ plane. As described above, the roller arrangement in FIG. 4C has the effect of reliably suppressing pendulum-like lateral vibration that can occur in the balancing ropes 12 when the car 7 is traveling.

[0030] As described above, in the elongated body guiding device 14, the first straight portion 15 of the compensating rope 12 is sandwiched between the first roller 14a and the second roller 14b, which are located at different heights in the vertical direction. As a result, the bending of the compensating rope 12 is constrained at the positions where the first roller 14a and the second roller 14b are located. This makes it possible to suppress the propagation of short-wavelength vibrations along the compensating rope 12, which are generated by the starting shock when the car 7 starts to travel or by acceleration or deceleration. In contrast, assuming that the first roller 14a and the second roller 14b are located at the same height, the bending of the compensating rope 12 is not constrained at the positions where the first roller 14a and the second roller 14b are located, and therefore the propagation of short-wavelength vibrations along the compensating rope 12 cannot be suppressed.

[0031] Similarly, in the elongated body guiding device 14, the second straight portion 16 of the balancing rope 12 is sandwiched between the third roller 14c and the fourth roller 14d, which are positioned at different heights in the vertical direction. As a result, the bending of the balancing rope 12 is constrained at the positions where the third roller 14c and the fourth roller 14d are positioned. This makes it possible to suppress the propagation of short-wavelength vibrations along the balancing rope 12, which are generated by the starting shock when the car 7 starts to travel or by acceleration or deceleration. In contrast, assuming that the third roller 14c and the fourth roller 14d are positioned at the same height, the bending of the balancing rope 12 is not constrained at the positions where the third roller 14c and the fourth roller 14d are positioned, and therefore the propagation of short-wavelength vibrations along the balancing rope 12 cannot be suppressed.

[0032] 5 is an explanatory diagram illustrating the installation positions of the first roller 14a, the second roller 14b, the third roller 14c, and the fourth roller 14d in the long object guiding device 14 according to the first embodiment. The first roller 14a, the second roller 14b, the third roller 14c, and the fourth roller 14d may be arranged as shown in FIG. 5. That is, the rollers may be arranged so that at least one of the vertical distance from the bottom of the curved portion 13 of the balancing rope 12 to the center of the lowermost roller among the first roller 14a and the second roller 14b and the vertical distance from the bottom of the curved portion 13 of the balancing rope 12 to the center of the lowermost roller among the third roller 14c and the fourth roller 14d is equal to or greater than half (D / 2) of the suspension point distance D, which is the horizontal distance between the first straight portion 15 and the second straight portion 16 of the balancing rope 12.

[0033] As shown in Figure 4A, when the car 7 travels, pendulum-like lateral vibrations occur in the compensating ropes 12. At this time, the displacement of the lateral vibrations reaches a maximum at a position D / 2 above the lowest part of the curved portion 13 of the compensating ropes 12. In contrast, by arranging the rollers as described above, each roller restrains the left-right displacement of the compensating ropes 12 near the position where the displacement of the lateral vibrations of the compensating ropes 12 reaches a maximum. Therefore, by arranging the rollers in this manner, it is possible to more reliably suppress the occurrence of lateral vibrations in the compensating ropes 12 while the car 7 is traveling.

[0034] 5, the vertical distance from the bottom of the curved portion 13 of the compensating rope 12 to the center of the lower one of the first roller 14a and the second roller 14b is equal to D / 2. Also, the vertical distance from the bottom of the curved portion 13 of the compensating rope 12 to the center of the lower one of the third roller 14c and the fourth roller 14d is equal to D / 2.

[0035] Further, the vertical distance from the lowermost part of the curved portion 13 of the balance rope 12 to the center of the roller located below among the first roller 14a and the second roller 14b, and the vertical distance from the lowermost part of the curved portion 13 of the balance rope 12 to the center of the roller located below among the third roller 14c and the fourth roller 14d, it is preferable that at least one of the distances is D or less, and more preferably 3D / 4 or less. Thereby, near the position where the displacement of the lateral vibration of the balance rope 12 becomes maximum, each roller restrains the displacement of the balance rope 12 in the left - right direction. Therefore, by arranging each roller in this way, the occurrence of lateral vibration generated in the balance rope 12 during the travel of the cage 7 can be more reliably suppressed.

[0036] FIG. 6 is an explanatory view regarding the installation positions of the first roller 14a, the second roller 14b, the third roller 14c, and the fourth roller 14d in the long - body guiding device 14 according to the first embodiment. The first roller 14a, the second roller 14b, the third roller 14c, and the fourth roller 14d may be arranged as shown in FIG. 6. That is, when the vertical distance from the lowermost part of the curved portion 13 of the balance rope 12 to the lowermost position where the cage 7 or the balance weight 8 can move is PD, the vertical distance from the lowermost part of the curved portion 13 of the balance rope 12 to the upper end of the roller located below among the first roller 14a and the second roller 14b is A, and the vertical distance between the center of the first roller 14a and the center of the second roller 14b is r, each roller may be arranged so as to satisfy the relationship of 0 < r < (PD - A). Note that the "lowermost position where the cage 7 or the balance weight 8 can move" corresponds to the same height as the floor surface in the cage 7 when the cage 7 collides with the cage buffer and the cage buffer is most compressed, or the same height as the lower end of the balance weight 8 when the balance weight 8 collides with the balance - weight buffer and the balance - weight buffer is most compressed.

[0037] As shown in Fig. 4B, when lateral vibration occurs in the compensating ropes 12 and the compensating ropes 12 collide with a roller, the compensating ropes 12 bend locally with the roller as a fulcrum, generating lateral vibration with a short wavelength. In contrast, by arranging the rollers so as to satisfy the conditions described using Fig. 6, the local bending of the compensating ropes 12 can be more reliably restrained, and the propagation of lateral vibration with a short wavelength can be more reliably suppressed. Therefore, the occurrence of lateral vibration occurring in the compensating ropes 12 while the car 7 is traveling can be more reliably suppressed.

[0038] 6, the upper end of the upper one of the first roller 14a and the second roller 14b is located at a position lower than the lowest level to which the car 7 can move. The upper end of the upper one of the third roller 14c and the fourth roller 14d is located at a position lower than the lowest level to which the counterweight 8 can move.

[0039] In an elevator system equipped with the long body guide device 14 of this embodiment, the suspension shape of the counter ropes 12 can be made closer to an ideal shape that is less prone to lateral sway, and this ideal shape can be reliably maintained while the car 7 is traveling. This reliably prevents an increase in lateral sway of the counter ropes 12 when the car 7 and counter weight 8 are moving. Furthermore, because no load from a tension sheave or the like is applied to the counter ropes 12, the burden on equipment such as the car-side rope suspension unit 10, the counter weight-side rope suspension unit 11, and the hoist 4 can be reduced. This prevents these equipment from becoming larger, and also prevents the elevator system from becoming larger.

[0040] Generally, in a configuration in which tension sheaves are not suspended from the counter ropes 12, the shape and curvature radius of the curved portion 13 formed below the counter ropes 12 may deviate from the design values depending on the stiffness of the counter ropes 12. If the car 7 and counter weight 8 are moved with the shape and curvature radius of the curved portion 13 of the counter ropes 12 significantly deviating from the design values, the lateral sway of the counter ropes 12 is likely to increase. In contrast, in this embodiment, by providing the first roller 14a, the second roller 14b, the third roller 14c, and the fourth roller 14d, the shape and curvature radius of the curved portion 13 of the counter ropes 12 can be reliably maintained in accordance with the design values without tension sheaves. Therefore, the lateral sway of the counter ropes 12 can be more reliably suppressed when the car 7 and counter weight 8 move.

[0041] In this embodiment, the horizontal positions of the first roller 14a, the second roller 14b, the third roller 14c, and the fourth roller 14d do not change. Therefore, when the car 7 and the counterweight 8 move, the shape and curvature radius of the curved portion 13 of the counterrope 12 can be more reliably maintained in a state conforming to the design values. Furthermore, when the car 7 and the counterweight 8 move, the horizontal distance between the center line of the first straight portion 15 and the center line of the second straight portion 16 can be more reliably maintained in a state equal to the suspension point distance D.

[0042] In the illustrated example, an example has been described in which the first roller 14a is arranged closer to the second straight section 16 than the second roller 14b in the first roller pair, i.e., the first roller 14a is arranged on the inside and the second roller 14b is arranged on the outside. The present disclosure is not limited to these examples, and the second roller 14b may be arranged closer to the second straight section 16 than the first roller 14a. In other words, the first roller 14a may be arranged on the outside and the second roller 14b may be arranged on the inside.

[0043] In the illustrated example, an example has been described in which the third roller 14c is arranged closer to the first straight portion 15 than the fourth roller 14d in the second roller pair, i.e., the third roller 14c is arranged on the inside and the fourth roller 14d is arranged on the outside. The present disclosure is not limited to these examples, and the fourth roller 14d may be arranged closer to the first straight portion 15 than the third roller 14c. In other words, the third roller 14c may be arranged on the outside and the fourth roller 14d may be arranged on the inside.

[0044] In the example of Fig. 5, the diameter of the first roller 14a is equal to the diameter of the second roller 14b, and the diameter of the third roller 14c is equal to the diameter of the fourth roller 14d. In the example of Fig. 6, the diameter of the first roller 14a is smaller than the diameter of the second roller 14b, and the diameter of the third roller 14c is smaller than the diameter of the fourth roller 14d. However, the present invention is not limited to these examples, and the diameter of the first roller 14a may be larger than the diameter of the second roller 14b, or the diameter of the third roller 14c may be larger than the diameter of the fourth roller 14d.

[0045] 1, 2, 3, and 4C, the rotation axis of the first inner roller 14a is higher than the rotation axis of the second outer roller 14b, and the rotation axis of the third inner roller 14c is higher than the rotation axis of the fourth outer roller 14d.

[0046] 5 and 6, the rotation axis of the first inner roller 14a is positioned lower than the rotation axis of the second outer roller 14b, and the rotation axis of the third inner roller 14c is positioned lower than the rotation axis of the fourth outer roller 14d.

[0047] A groove that comes into contact with the counter rope 12 may be provided in the outer periphery of the first roller 14a, in a ring shape along the circumferential direction of the first roller 14a. A groove that comes into contact with the counter rope 12 may be provided in the outer periphery of the second roller 14b, in a ring shape along the circumferential direction of the second roller 14b. A groove that comes into contact with the counter rope 12 may be provided in the outer periphery of the third roller 14c, in a ring shape along the circumferential direction of the third roller 14c. A groove that comes into contact with the counter rope 12 may be provided in the outer periphery of the fourth roller 14d, in a ring shape along the circumferential direction of the fourth roller 14d. By providing grooves as described above on each roller, each roller can more appropriately guide the counter rope 12.

[0048] Embodiment 2 Next, a second embodiment will be described with reference to Figs. 7 to 9. The differences from the first embodiment will be mainly described, and the description of the commonalities will be simplified or omitted. The same reference numerals will be used to designate elements that are common to or correspond to the elements described above. Fig. 7 is a perspective view showing a long body guiding device 14A according to the second embodiment. Fig. 8 is a cross-sectional view illustrating the arrangement of the rollers of the long body guiding device 14A. Fig. 9 is a side view illustrating the arrangement of the rollers of the long body guiding device 14A.

[0049] According to this embodiment, it is possible to more reliably suppress the vibration component of the balancing ropes 12 that occurs in a plane direction perpendicular to the plane including the curved portion 13, that is, in the Z-axis direction.

[0050] In the elevator system of FIG. 1, when the car 7 travels without the long-item guide device 14A installed, the compensating ropes 12 may experience pendulum-like vibration in a direction perpendicular to the plane including the lower curved portion 13 of the compensating ropes 12, i.e., in a direction along the ZX plane. To suppress this vibration, the long-item guide device 14A is configured to further include a fifth roller 14e, a sixth roller 14f, a seventh roller 14g, and an eighth roller 14h in addition to the first roller 14a, the second roller 14b, the third roller 14c, and the fourth roller 14d, as shown in FIG. 7A. As shown in FIG. 7B, the long-item guide device 14A includes roller position fixing members 14i that fix the positions of the rotation axes of the first roller 14a through the eighth roller 14h. In this example, the roller position fixing members 14i are fixed to pits. The roller position fixing members 14i are not shown in FIG. 7A. Fig. 7B is a diagram of the elongate body guiding device 14A including the roller position fixing member 14i. Fig. 8A shows a cross-sectional view at the height of point A shown in Fig. 7A. Fig. 8B shows a cross-sectional view at the height of point B shown in Fig. 7A.

[0051] In this embodiment, the first roller 14a, the second roller 14b, the third roller 14c, and the fourth roller 14d are the same as those in the first embodiment, and therefore, description thereof will be omitted.

[0052] The fifth roller 14e and the sixth roller 14f guide the counter rope 12, sandwiching the first straight portion 15 of the counter rope 12 therebetween. Each of the fifth roller 14e and the sixth roller 14f is rotatable while in contact with the counter rope 12. The rotation axis of the fifth roller 14e is parallel to the rotation axis of the sixth roller 14f. The rotation axis of the fifth roller 14e is perpendicular to the rotation axis of the first roller 14a. The rotation axis of the sixth roller 14f is perpendicular to the rotation axis of the second roller 14b. With respect to the vertical position, the vertical position of the rotation axis of the fifth roller 14e is different from the vertical position of the rotation axis of the sixth roller 14f. The fifth roller 14e and the sixth roller 14f correspond to the third roller pair.

[0053] The seventh roller 14g and the eighth roller 14h guide the counter rope 12, sandwiching the second straight portion 16 of the counter rope 12 therebetween. Each of the seventh roller 14g and the eighth roller 14h is rotatable while in contact with the counter rope 12. The rotation axis of the seventh roller 14g is parallel to the rotation axis of the eighth roller 14h. The rotation axis of the seventh roller 14g is perpendicular to the rotation axis of the third roller 14c. The rotation axis of the eighth roller 14h is perpendicular to the rotation axis of the fourth roller 14d. With respect to vertical position, the vertical position of the rotation axis of the seventh roller 14g is different from the vertical position of the rotation axis of the eighth roller 14h. The seventh roller 14g and the eighth roller 14h correspond to the fourth roller pair. The roller position fixing member 14i fixes the positions of each of the first to fourth roller pairs.

[0054] As described above, the long object guiding device 14A according to the second embodiment includes the first to fourth roller pairs to restrain the displacement of the compensating ropes 12. Therefore, an elevator system including the long object guiding device 14A can reliably suppress vibrations in the left-right direction of the plane including the curved portion 13 of the compensating ropes 12, as well as vibrations along a plane perpendicular to the plane including the curved portion 13. In the illustrated example, the following positional relationships exist: the centers of the lower rollers of the fifth roller 14e and the sixth roller 14f are higher than the centers of the lower rollers of the first roller 14a and the second roller 14b; the centers of the upper rollers of the fifth roller 14e and the sixth roller 14f are lower than the centers of the upper rollers of the first roller 14a and the second roller 14b; and the centers of the lower rollers of the seventh roller 14g and the eighth roller 14h are higher than the centers of the lower rollers of the third roller 14c and the fourth roller 14d. The center of the upper roller of the seventh roller 14g and the eighth roller 14h is lower than the center of the upper roller of the third roller 14c and the fourth roller 14d. This example is not limiting, and the following positional relationships may be used in the present disclosure. The center of the lower roller of the fifth roller 14e and the sixth roller 14f may be lower than the center of the lower roller of the first roller 14a and the second roller 14b. The center of the upper roller of the fifth roller 14e and the sixth roller 14f may be higher than the center of the upper roller of the first roller 14a and the second roller 14b. The center of the lower roller of the seventh roller 14g and the eighth roller 14h may be lower than the center of the lower roller of the third roller 14c and the fourth roller 14d. The center of the upper roller of the seventh roller 14g and the eighth roller 14h may be higher than the center of the upper roller of the third roller 14c and the fourth roller 14d.

[0055] Embodiment 3 Next, a third embodiment will be described with reference to Figures 10 and 11. The description will focus on differences from the first embodiment described above, and common explanations will be simplified or omitted. Elements that are common to or correspond to the elements described above will be given the same reference numerals. Figure 10 is a perspective view showing a long body guiding device 14B according to the third embodiment. Figure 11 is a cross-sectional view showing a main portion of the long body guiding device 14B. Figure 11A shows a main portion of the long body guiding device 14B at height A in Figure 10. Figure 11B shows a main portion of the long body guiding device 14B at height B in Figure 10.

[0056] In this embodiment, a description will be given of a configuration example of a long object guide device 14B in the case where a plurality of compensating ropes 12 are suspended. The elevator device of this embodiment includes a plurality of compensating ropes 12 arranged in parallel to each other.

[0057] In an elevator device such as that shown in Figure 1, if there is a large imbalance between the weight of the suspended body 9 on the car 7 side and the suspended body 9 on the counterweight 8 side, multiple counterweight ropes 12 may be hung as shown in Figure 10 to compensate for the imbalance weight.

[0058] The elongated body guiding device 14B shown in FIGS. 10 and 11 has a configuration suitable for a case in which multiple compensating ropes 12 are suspended. As shown in FIG. 11A, a plurality of parallel grooves 17 are formed in an annular shape around the circumferential direction of the first roller 14a on the outer periphery of the first roller 14a, each of which individually contacts the corresponding one of the multiple compensating ropes 12. A plurality of parallel grooves 17 are formed in an annular shape around the circumferential direction of the third roller 14c on the outer periphery of the third roller 14c, each of which individually contacts the corresponding one of the multiple compensating ropes 12. As shown in FIG. 11B, a plurality of parallel grooves 17 are formed in an annular shape around the circumferential direction of the second roller 14b on the outer periphery of the second roller 14b, each of which individually contacts the corresponding one of the multiple compensating ropes 12. A plurality of parallel grooves 17 are formed in an annular shape around the circumferential direction of the fourth roller 14d on the outer periphery of the fourth roller 14d, each of which individually contacts the corresponding one of the multiple compensating ropes 12.

[0059] In this embodiment, each of the multiple counter ropes 12 is guided by the corresponding groove 17 while individually contacting each of the first roller 14a to the fourth roller 14d. An elevator system equipped with such a long body guiding device 14B can bring the hanging shape of each of the multiple counter ropes 12 closer to an ideal shape that is less prone to lateral sway, and can reliably maintain that ideal shape even when the car 7 is traveling. This more reliably suppresses the increase in lateral sway of the counter ropes 12 when the car 7 and counter weight 8 are moving. Furthermore, because the load of a tension sheave or the like is not applied to the counter ropes 12, the burden on equipment such as the car-side rope suspension unit 10, the counter weight-side rope suspension unit 11, and the hoist 4 can be reduced. This prevents these equipment from becoming larger, and therefore the elevator system as a whole.

[0060] Embodiment 4 Next, a fourth embodiment will be described with reference to Figures 12 to 15. The description will focus on differences from the first embodiment, and common explanations will be simplified or omitted. Elements that are common to or correspond to the elements described above will be denoted by the same reference numerals.

[0061] In this embodiment, an example of a configuration will be described that more reliably prevents excessive load from being applied to the compensating ropes 12 when the emergency stop device (not shown) of the elevator device is activated and the lower curved portion 13 of the compensating ropes 12 jumps up.

[0062] FIG. 12 is a side view showing a state in which the emergency stop device of the elevator apparatus is activated, causing the lower curved portion 13 of the counter rope 12 to jump up in the air in the fourth embodiment. If an abnormality such as a power outage occurs in the elevator apparatus, a traction machine brake (not shown) provided on the traction machine 4 applies sudden braking. Furthermore, if an abnormality such as a break in the suspended body 9 or an abnormal increase in speed due to runaway of the control panel 6 occurs in the elevator apparatus, an emergency stop device (not shown) provided on the car 7 is activated, causing sudden braking. When such sudden braking occurs, a discrepancy occurs between the ascending and descending movements of the car 7 and the counter weight 8, which may cause a displacement in which the curved portion 13 jumps up in the upward direction, as shown in FIG. 12.

[0063] Fig. 13 is a perspective view showing a long body guiding device 14C according to embodiment 4. As shown in Fig. 13, long body guiding device 14C includes a first roller 14a, a second roller 14b, a third roller 14c, and a fourth roller 14d. The arrangement of these rollers is the same as the configuration described in embodiment 1.

[0064] The elongated body guiding device 14C includes a roller position fixing member 14j. The roller position fixing member 14j has four elongated holes 18a, 18b, 18c, and 18d formed therein. Each of the elongated holes 18a, 18b, 18c, and 18d has a slot that forms a rectangular opening that is long in the vertical direction. The first roller 14a is supported slidably along the elongated holes 18a and 18b in the vertical direction, i.e., the X-axis direction. The third roller 14c is supported slidably along the elongated holes 18c and 18d in the vertical direction, i.e., the X-axis direction. The vertical dimension of each of the elongated holes 18a, 18b, 18c, and 18d is L. The first roller 14a and the third roller 14c are restricted from moving left and right in the Y-axis direction. The first roller 14a and the third roller 14c do not move left and right in the Y-axis direction.

[0065] As described above, in this embodiment, first roller 14a is located closer to second straight portion 16 than second roller 14b and is provided so as to be movable in the vertical direction. Furthermore, third roller 14c is located closer to first straight portion 15 than fourth roller 14d and is provided so as to be movable in the vertical direction. In the illustrated example, first roller 14a and third roller 14c are disposed on the inner side of curved portion 13.

[0066] In this embodiment, the roller position fixing member 14j corresponds to a roller support portion that supports the first roller 14a, the second roller 14b, the third roller 14c, and the fourth roller 14d so that the horizontal positions of the rotation axes of the first roller 14a, the second roller 14b, the third roller 14c, and the fourth roller 14d do not change. In this embodiment, the roller position fixing member 14j supports the first roller 14a and the third roller 14c so that the positions of the rotation axes of the first roller 14a and the third roller 14c are movable in the X-axis direction, i.e., the vertical direction, but the positions of the rotation axes of the first roller 14a and the third roller 14c do not change in either the Y-axis or the Z-axis. In addition, the roller position fixing member 14j supports the second roller 14b and the fourth roller 14d so that the positions of the rotation axes of the second roller 14b and the fourth roller 14d do not change in either the X-axis, the Y-axis, or the Z-axis.

[0067] Under normal conditions when neither the hoist brake nor the safety device is in operation, the first roller 14a is supported by its own weight at the lower end portions of the elongated holes 18a and 18b, as shown in Figure 13. Similarly, the third roller 14c is supported by its own weight at the lower end portions of the elongated holes 18c and 18d.

[0068] Fig. 14 is a perspective view showing a state in which the hoist brake or the safety device is activated in the long body guiding device 14C according to the fourth embodiment, causing the curved portion 13 of the balancing rope 12 to jump up. When the hoist brake or the safety device is activated and the curved portion 13 of the balancing rope 12 jumps up, the balancing rope 12 comes into contact with the first roller 14a and the third roller 14c arranged on the inside of the curved portion 13, as shown in Fig. 14. After the curved portion 13 of the balancing rope 12 comes into contact with the first roller 14a and the third roller 14c, as the curved portion 13 further displaces upward, the first roller 14a displaces upward along the elongated holes 18a and 18b, and the third roller 14c displaces upward along the elongated holes 18c and 18d.

[0069] In the elevator apparatus of this embodiment equipped with such a long body guide device 14C, the first roller 14a and the third roller 14c are configured to be movable in the vertical direction, so that excessive loads can be more reliably prevented from acting on the counter ropes 12 and the long body guide device 14C when an emergency stop device or the like is activated and the curved portion 13 of the counter ropes 12 jumps up. Because excessive loads are not applied to the counter ropes 12, the burden on equipment such as the car-side rope suspension unit 10, the counter weight-side rope suspension unit 11, and the hoist 4 can be further reduced. This more reliably prevents these equipment from becoming larger, and also more reliably prevents the elevator apparatus from becoming larger.

[0070] The elevator device of this embodiment further includes a first stopper that restricts the upward displacement of first roller 14a in the vertical direction and a second stopper that suppresses the upward displacement of third roller 14c in the vertical direction. The upper ends of elongated holes 18a and 18b correspond to the first stopper. The upper ends of elongated holes 18c and 18d correspond to the second stopper.

[0071] When the first roller 14a is displaced upward by the distance L and reaches the upper ends of the elongated holes 18a and 18b, i.e., the first stoppers, the first roller 14a will no longer be displaced upward. When the third roller 14c is displaced upward by the distance L and reaches the upper ends of the elongated holes 18c and 18d, i.e., the second stoppers, the third roller 14c will no longer be displaced upward.

[0072] In this embodiment, by providing the first and second stoppers, it is possible to more reliably prevent the curved portion 13 of the compensating rope 12 from rising excessively when the curved portion 13 jumps up. Therefore, it is possible to more reliably prevent the compensating rope 12 from colliding with other parts.

[0073] Elastic bodies such as springs or rubber may be placed at the upper end portions of the elongated holes 18a, 18b, 18c, and 18d. The elastic bodies placed at the upper end portions of the elongated holes 18a and 18b can absorb the impact when the first roller 14a reaches the upper end of the elongated holes 18a and 18b. The elastic bodies placed at the upper end portions of the elongated holes 18c and 18d can absorb the impact when the third roller 14c reaches the upper end of the elongated holes 18c and 18d.

[0074] Fig. 15 is a perspective view showing a modified elongated body guiding device 14D according to embodiment 4. The example shown in Fig. 15 may be used instead of the example shown in Figs. 13 and 14. In elongated body guiding device 14C shown in Figs. 13 and 14, in the first roller pair, first roller 14a is positioned closer to second straight section 16 than second roller 14b. In contrast, in elongated body guiding device 14D shown in Fig. 15, second roller 14b is positioned closer to second straight section 16 than first roller 14a. In other words, second roller 14b is on the inside and first roller 14a is on the outside.

[0075] 13 and 14, in the second roller pair, the third roller 14c is positioned closer to the first straight section 15 than the fourth roller 14d. In contrast, in the long body guiding device 14D shown in Fig. 15, the fourth roller 14d is positioned closer to the first straight section 15 than the third roller 14c. In other words, the fourth roller 14d is on the inside and the third roller 14c is on the outside.

[0076] In the elongated body guiding device 14D shown in FIG. 15, the second roller 14b is supported so as to be slidable in the vertical direction, i.e., the X-axis direction, along the elongated holes 18a and 18b. The fourth roller 14d is supported so as to be slidable in the vertical direction, i.e., the X-axis direction, along the elongated holes 18c and 18d. When the second roller 14b displaces upward by a distance L and reaches the upper ends of the elongated holes 18a and 18b, the upper ends of the elongated holes 18a and 18b act as stoppers to restrict the upward displacement of the second roller 14b. This prevents the second roller 14b from displacing further upward. The upper ends of the elongated holes 18a and 18b correspond to third stoppers that restrict the upward displacement of the second roller 14b in the vertical direction.

[0077] In the elongated body guiding device 14D shown in FIG. 15, the fourth roller 14d is supported so as to be slidable in the vertical direction, i.e., the X-axis direction, along the elongated holes 18c, 18d. When the fourth roller 14d displaces upward by a distance L and reaches the upper ends of the elongated holes 18c, 18d, the upper ends of the elongated holes 18c, 18d act as stoppers, restricting the upward displacement of the fourth roller 14d. This prevents the fourth roller 14d from displacing further upward. The upper ends of the elongated holes 18c, 18d correspond to the fourth stoppers, which restrict the vertical upward displacement of the fourth roller 14d.

[0078] 15, it is also preferable to place elastic bodies at the upper end portions of the elongated hole portions 18a, 18b, 18c, and 18d, so that the shock generated when the second roller 14b and the fourth roller 14d are displaced upward and reach the upper ends of the elongated hole portions 18a, 18b, 18c, and 18d can be absorbed.

[0079] In the long body guide device 14D shown in Figure 15, when the curved portion 13 of the balancing rope 12 is not jumped up, the outer first roller 14a is at a higher vertical position than the inner second roller 14b, and the outer third roller 14c is at a higher position than the inner fourth roller 14d.

[0080] Of the features of the above-described multiple embodiments, two or more features that can be combined may be combined and implemented. [Industrial Applicability]

[0081] The elevator system according to the present disclosure can be used in an elevator system having a long body for weight compensation suspended between a car and a counterweight. [Explanation of symbols]

[0082] 1 elevator shaft, 2 machine room, 3 driving sheave, 4 hoist, 5 deflector, 6 control panel, 7 car, 8 counterweight, 9 suspended body, 10 car side rope hanging section, 11 counterweight side rope hanging section, 12 balancing rope, 13 curved section, 14 long body guide device, 14A long body guide device, 14B long body guide device, 14C long body guide device, 14D long body guide device, 14a first roller, 14b second roller, 14c third roller, 14d fourth roller, 14e fifth roller, 14f sixth roller, 14g seventh roller, 14h eighth roller, 14i roller position fixing member, 14j roller position fixing member, 15 1st straight part, 16 2nd straight part, 17 groove, 18a,18b,18c,18d long hole part

Claims

1. Basket, A counterweight and an elongated body connected between the car and the counterweight, the elongated body having a first straight portion suspended from the car, a second straight portion suspended from the counterweight, and a curved portion connecting the first straight portion and the second straight portion; a first roller and a second roller that sandwich the first linear portion of the elongated body and guide the elongated body; a third roller and a fourth roller that sandwich the second linear portion of the elongated body and guide the elongated body; Equipped with the rotation axis of the first roller is parallel to the rotation axis of the second roller; With respect to vertical positions, the vertical position of the rotation axis of the first roller is different from the vertical position of the rotation axis of the second roller; the rotation axis of the third roller is parallel to the rotation axis of the fourth roller; With respect to vertical positions, the vertical position of the rotation axis of the third roller is different from the vertical position of the rotation axis of the fourth roller; The elongated body does not hang a tension wheel, an elevator apparatus further comprising: a roller support portion that supports the first roller, the second roller, the third roller, and the fourth roller so that the positions of the rotation axes of the first roller, the second roller, the third roller, and the fourth roller do not change in the horizontal direction.

2. Basket, A counterweight and an elongated body connected between the car and the counterweight, the elongated body having a first straight portion suspended from the car, a second straight portion suspended from the counterweight, and a curved portion connecting the first straight portion and the second straight portion; a first roller and a second roller that sandwich the first linear portion of the elongated body and guide the elongated body; a third roller and a fourth roller that sandwich the second linear portion of the elongated body and guide the elongated body; a fifth roller and a sixth roller that sandwich the first linear portion of the elongated body and guide the elongated body; a seventh roller and an eighth roller that sandwich the second linear portion of the elongated body and guide the elongated body; Equipped with the rotation axis of the first roller is parallel to the rotation axis of the second roller; With respect to vertical positions, the vertical position of the rotation axis of the first roller is different from the vertical position of the rotation axis of the second roller; the rotation axis of the third roller is parallel to the rotation axis of the fourth roller; With respect to vertical positions, the vertical position of the rotation axis of the third roller is different from the vertical position of the rotation axis of the fourth roller; the rotation axis of the fifth roller is perpendicular to the rotation axis of the first roller; the rotation axis of the fifth roller is parallel to the rotation axis of the sixth roller; With respect to vertical positions, the vertical position of the rotation axis of the fifth roller is different from the vertical position of the rotation axis of the sixth roller; the rotation axis of the seventh roller is perpendicular to the rotation axis of the third roller; the rotation axis of the seventh roller is parallel to the rotation axis of the eighth roller; With respect to vertical positions, the vertical position of the rotation axis of the seventh roller is different from the vertical position of the rotation axis of the eighth roller.

3. 3. The elevator apparatus according to claim 1, wherein at least one of the vertical distance from the bottom of the curved portion of the elongated body to the center of the lower one of the first roller and the second roller and the vertical distance from the bottom of the curved portion of the elongated body to the center of the lower one of the third roller and the fourth roller is equal to or greater than half of the horizontal distance between the first straight portion and the second straight portion of the elongated body.

4. The vertical distance from the bottom of the curved portion of the elongated body to the lowest position to which the car or the counterweight can move is defined as PD, A is the vertical distance from the bottom of the curved portion of the elongated body to the top end of the lower roller of the first roller and the second roller, When the vertical distance between the center of the first roller and the center of the second roller is r, 0<r<(PD-A) 3. The elevator apparatus according to claim 1, wherein the following relationship is satisfied:

5. a groove that contacts the elongated body is provided in an outer circumferential portion of the first roller along a circumferential direction of the first roller, a groove that contacts the elongated body is provided in an outer circumferential portion of the second roller along a circumferential direction of the second roller, a groove that comes into contact with the elongated body is provided in an outer circumferential portion of the third roller along a circumferential direction of the third roller, 3. The elevator apparatus according to claim 1, wherein a groove that comes into contact with the elongated body is provided on an outer periphery of the fourth roller along a circumferential direction of the fourth roller.

6. a plurality of the elongated bodies arranged parallel to one another; a plurality of grooves that are in contact with the plurality of elongated bodies individually are provided in an outer circumferential portion of the first roller along a circumferential direction of the first roller, a plurality of grooves that are in contact with the plurality of elongated bodies individually are provided in an outer circumferential portion of the second roller along a circumferential direction of the second roller, a plurality of grooves that are in contact with the plurality of elongated bodies individually are provided in an outer circumferential portion of the third roller along a circumferential direction of the third roller, 3. The elevator apparatus according to claim 1, wherein a plurality of grooves that individually contact each of the plurality of elongated bodies are provided on the outer periphery of the fourth roller along the circumferential direction of the fourth roller.

7. the first roller is located closer to the second linear portion than the second roller and is provided so as to be movable in a vertical direction, 3. The elevator apparatus according to claim 1, wherein the third roller is located closer to the first straight portion than the fourth roller and is provided so as to be movable in the vertical direction.

8. a first stopper that restricts upward displacement of the first roller in the vertical direction; a second stopper that suppresses upward displacement of the third roller in the vertical direction; The elevator system of claim 7 further comprising:

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