JPH09194158A - Idle running prevention device for elevator sheave - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the idle running of an elevator sheave when the car of an elevator is locked, and prevent the occurrence of abnormal friction between a main rope and the elevator sheave. SOLUTION: The idle running prevention device of an elevator sheave is formed out of a sheave sliding rotor 10 provided with a rotor which is brought into contact with the sheave 5 so as to be rotated, a linking chain 12 connecting with gears provided for the sheave sliding rotor 10 and a main rope sliding rotor 11 respectively, and of paired sheave idle running detection switches 13 which are adjacently disposed while a part of the linking chain being held in such a way that the slack of the linking chain 12 can be detected. When the movement of the main rope 14 is suspended with a car 1 locked, the main rope sliding rotor 11 is suspended, however, since the sheave sliding rotor 10 keeps rotating, the linking chain 12 is slackened, and a part of the slacking chain is brought into contact with the sheave idle running detection switch 13. By this constitution, it is judged that the sheave 5 is in an idle running condition, so that the rotation of the sheave 5 is thereby suspended.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an idling prevention device for an elevator sheave, and more particularly to an idling prevention device for an elevator sheave which detects idling of the sheave when the elevator car is locked to prevent abnormal friction of the main rope. .

[0002]

2. Description of the Related Art FIG. 12 is an external view of a slip prevention device for an elevator sheave disclosed in Japanese Utility Model Laid-Open No. 2-94875. As shown in FIG. 12, the car 1 is connected to the suspension weight 2 via the sheave 5 and the deflector 6 by the main rope 14. The hoisting machine 3 fixed to the machine base 7 rotates the sheave 5 clockwise or counterclockwise,
Run car 1 up and down. Further, an encoder 4 is attached to the hoisting machine 3, and the encoder 4 allows the sheave 5 to move.
Rotation is detected. Further, a deflector wheel rotation detector 8 including a roller that rotates in contact with the deflector wheel 6 is provided below the machine base 7.

For example, when the elevator car 1 is locked, the movement of the main rope 14 is stopped, but the sheave 5 continues to rotate because the hoisting machine 3 is driven. For this reason,
The main rope 14 and the sheave 5 may have an abnormal friction.

However, according to the above-mentioned conventional device, when the car 1 and the hanging weight 2 are locked and the movement of the main rope is stopped, the deflector wheel rotation detector 8 detects the rotation stop of the deflector wheel 6. , The encoder 4 detects that the sheave 5 continues to rotate, and therefore compares the two outputs to determine the idling of the sheave 5, thereby rotating the sheave,
That is, the drive of the winding machine 3 can be stopped.

[0005]

However, in the case of an elevator without a deflector wheel, the above-mentioned device cannot be used, and it is not possible to solve the problem when the elevator car is locked.

Further, in the case of an elevator without a deflecting vehicle, it is conceivable to provide various detecting devices for detecting the traveling state of the car on the car side, but in this case, it is necessary to add a control cable for the car. The equipment cost is high. Particularly, in the case of a dam waiter, a control cable is not attached, so that a new control cable must be attached, which also raises a problem that the equipment cost is high.

The present invention has been made in view of the above conventional problems, and an object thereof is to detect an idling of a sheave when an elevator car is locked to prevent abnormal friction between the main rope and the sheave. An object of the present invention is to provide a slip prevention device for an elevator sheave.

[0008]

In order to solve the above problems, an elevator sheave preventing device according to the present invention has the following features.

(1) In an elevator in which a main rope, which is mounted on a sheave and which connects a basket and a suspension weight, is moved forward and backward by the rotation of the sheave, the car travels in contact with the sheave. A roller, a main rope sliding roller that rotates in contact with the main rope and that rotates in conjunction with the sheave sliding roller, and a step-out rotation of the sheave sliding roller and the main rope sliding roller that rotate in conjunction with each other. And a sheave idling detector for detecting the sheave. The sheave of the sheave is stopped in accordance with the output of the sheave idle detector.

Therefore, even in an elevator without a deflector, it is possible to directly detect the rotation of the sheave and the movement of the main rope by the sheave sliding roller and the main rope sliding roller.
Further, by detecting the step-out rotation of the sheave sliding roller and the main rope sliding roller which rotate in conjunction with each other by the sheave idle detector, it is possible to detect the idle rotation of the sheave. And
By stopping the rotation of the sheave according to the output of the sheave idle detector, it is possible to prevent abnormal friction between the main rope and the sheave even in an elevator without a deflector.

(2) In an elevator in which a main rope, which is mounted on a sheave and which connects a basket and a suspension weight, is moved forward and backward by the rotation of the sheave, the car travels in contact with the sheave. A roller, a main rope sliding roller that rotates in contact with the main rope, an interlocking annular zone that interlocks the sheave sliding roller and the main rope sliding roller, and detects looseness of the interlocking annular zone. And a pair of sheave / wheel idle detection switches disposed adjacent to each other with a part of the belt sandwiched therebetween. When the interlocking ring contacts the sheave / wheel idle detection switch, the rotation of the sheave is stopped.

Therefore, the elevator car is locked,
When the sheave sliding roller rotates but the main rope sliding roller does not rotate, the interlocking ring zone is loosened or pulled so that the belt comes into contact with one of the pair of sheave idle detection switches. By this, it detects the slip of the sheave,
The rotation of the sheave can be stopped. Therefore, it is possible to prevent abnormal friction between the main rope and the sheave even in an elevator without a deflector.

(3) In an elevator in which a main rope, which is mounted on a sheave and connects a basket and a suspension weight, is moved forward and backward by the rotation of the sheave, the car is run, and a sheave sliding roller that is in contact with the sheave, A sheave chain gear fixed coaxially with the sheave sliding roller, a main rope sliding roller rotating in contact with the main rope, and a main rope fixed so as to be able to slip coaxially with the main rope sliding roller. Chain gears,
The sheave car chain gear and an interlocking chain that connects the main rope chain gear, and the main rope sliding roller or the main rope chain gear has a friction caused by slip of the main rope chain gear due to idling of the sheave. A heat sensing element for detecting heat is built in, and the rotation of the sheave is stopped according to the output of the heat sensing element.

That is, when the car of the elevator is locked, the movement of the main rope stops and the rotation of the main rope sliding roller stops, but the sheave continues to rotate, so that the sheave sliding roller and the sheave chain are stopped. The gears continue to rotate. Therefore, the main rope chain gear fixed to the main rope sliding roller so as to be slippery is forcibly rotated by the interlocking chain so as to interlock with the rotation of the sheave chain gear. Friction heat caused by slipping of the main rope chain gear due to idling of the sheave is detected by the heat sensing element built in the main rope sliding roller, and rotation of the sheave is stopped in response to this heat sensing. Can be made. Therefore, it is possible to prevent abnormal friction between the main rope and the sheave even in an elevator without a deflector.

(4) In an elevator in which a main rope, which is mounted on a sheave and connects a basket and a hanging weight, is moved forward and backward by the rotation of the sheave, the sheave sliding roller that is in contact with the sheave, A sheave chain gear fixed coaxially with the sheave sliding roller, a main rope sliding roller rotating in contact with the main rope, and a main rope fixed so as to be able to slip coaxially with the main rope sliding roller. Chain gears,
An interlocking chain that connects the sheave wheel chain gear and the main rope chain gear, and a shift detector that detects a rotation shift between the main roller sliding roller and the main rope chain gear, and the output of the shift detector Stop the rotation of the sheave according to.

That is, when the car of the elevator is locked, the movement of the main rope stops and the rotation of the main rope sliding roller stops, but the sheave continues to rotate, so that the sheave sliding roller and the sheave chain are stopped. The gears continue to rotate. Therefore, the main rope sliding gear fixed to the main rope sliding roller is forcibly rotated by the interlocking chain so as to interlock with the rotation of the sheave chain gear. And the main rope chain gear are out of rotation. Since this rotation deviation is detected by the deviation detector and the rotation of the sheave is stopped, abnormal friction between the main rope and the sheave can be prevented even in an elevator without a deflector, and furthermore, the sheave can be instantaneously It is possible to detect the idling of.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described.

Embodiment 1. FIG. 1 is a layout view of a first embodiment of a slip prevention device for an elevator sheave according to the present invention. 2 is a diagram showing the configuration of the idling prevention device for an elevator sheave according to the first embodiment, and FIG. 3 is a view of X1 of FIG.
It is a sectional view taken along the line -X2. The same components as those of the conventional elevator described above are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 1, the slip prevention device for an elevator sheave according to the present embodiment has a main body fixed to a machine base 7 and provided with rollers that rotate in contact with the sheave 5 to rotate the sheave 1.
0, a main rope sliding rotating body 11 having a body fixed to the machine base 7 and rotating in contact with the main rope 14, a sheave sliding rotating body 10 and a main rope sliding rotating body 11, respectively. An interlocking chain 12 that is an interlocking ring zone that connects the provided gears, and a pair of sheaves that are fixed to the machine base 7 and are arranged adjacent to each other with a part of the interlocking chain 12 sandwiched therebetween so as to detect looseness It consists of a slip detection switch 13. This sheave idle detection switch 13 functions as a sheave idle detector that detects out-of-step rotation between a roller that rotates in contact with the sheave that rotates in conjunction with it and a roller that rotates in contact with the main rope.

More specifically, as shown in FIG. 2, the sheave sheave rotating body 10 has a sheave sheave roller 21 that rotates in contact with the sheave 5, and is coaxial with the sheave sheave roller 21, that is, as shown in FIG. As shown in FIGS. 4 and 5, it comprises a sheave sliding roller 21 and a sheave chain gear 22 fixed by a shaft 23. Further, the main rope sliding rotating body 11 includes a main rope sliding roller 31 that rotates in contact with the main rope 14 and a main rope sliding roller 31 that is coaxial with the main rope sliding roller 31, that is, as shown in FIGS. 31 and a main rope chain gear 32 fixed by a shaft 33. As shown in FIG. 7, a groove is formed on the roller surface of the main rope sliding roller 31 so that the main rope 14 can be engaged with the main rope 14 without deviating to the left or right. Further, in the interlocking chain 12, both gears 22 and 32 are connected to each other such that a sheave chain gear 22 and a main rope chain gear 32 have a vertical slack. In the present embodiment, the sheave wheel sliding roller 21 and the main rope sliding roller 31 prevent the sheave wheel and the main rope from slipping during normal traveling of the elevator, and the sheave wheel chain gear 22 and the main rope chain, respectively. The diameter of each roller is set so that the gear 32 is synchronized.

Further, a pair of sheave idle detection switches 13
As shown in FIG. 3, each comprises a switch body 41 fixed to the machine base 7, and a detection switch arm 42 attached to the tip of the switch body 41 and operated by the contact of the interlocking chain 12. In the present embodiment, the detection switch arm 42 is arranged so as not to come into contact with the vertically slackened interlocking chain 12 during normal traveling of the elevator.

Next, the operation of the idling prevention device for an elevator sheave according to this embodiment will be described with reference to FIGS.

Normally, when the elevator is operating up, the sheave 5 rotates counterclockwise (in FIG. 1). Therefore, the sheave sliding roller 21 in contact with the sheave 5 rotates clockwise (in FIG. 2), and the sheave chain gear 22 coaxially fixed to the sheave sliding roller 21 also rotates clockwise (in FIG. 2). ) To rotate. At the same time, since the main rope 14 on the car 1 side rises, the main rope sliding roller 31 rotates clockwise (in FIG. 2) and the main rope chain gear 32 coaxially fixed to the main rope sliding roller 31. Also rotates clockwise (in Fig. 2). At this time, the rotations of the sheave chain gear 22 and the main rope chain gear 32 are synchronized, so that the interlocking chain 12
Has a certain amount of slack in the upper and lower central portions, and does not come into contact with any of the pair of sheave idle detection switches 13,
Move to the right (in Fig. 2).

If the car 1 and the hanging weight 2 are locked and the movement of the main rope 14 is stopped, the rotation of the main rope roller 31 is stopped. This also stops the rotation of the main rope chain gear 32. However, since the sheave 5 continues to rotate counterclockwise, the sheave sliding roller 21
At the same time, the sheave chain gear 22 also continues to rotate clockwise. Therefore, the slack portion at the lower center of the interlocking chain 12 is pulled, and the slack portion at the upper center further slackens. The back surface of the loosened upper side interlocking chain 12 pushes the lower detection switch 42 downward to operate the sheave idle detection switch 13. The signal from the sheave idling detection switch 13 is output to a control device (not shown) in the machine room, and the control device determines that the sheave 5 is idling and rotates the sheave 5, that is, the hoist 3 A command is issued to the hoisting machine 3 to stop the driving of. As a result, the rotation of the sheave 5 can be stopped, and abnormal friction between the main rope and the sheave can be prevented even in an elevator without a deflector.

Further, normally, when the elevator is in the down operation, the sheave 5 rotates clockwise (in FIG. 1). Therefore, the sheave sliding roller 21 in contact with the sheave 5 rotates counterclockwise (in FIG. 2) and is coaxial with the sheave sliding roller 2.
The sheave chain gear 22 fixed to 1 also rotates counterclockwise (in FIG. 2). At the same time, since the main rope 14 on the car 1 side descends, the main rope sliding roller 31 rotates counterclockwise (in FIG. 2) and is coaxially fixed to the main rope sliding roller 31. 32 also rotates counterclockwise (in FIG. 2). At this time, since the rotations of the sheave wheel chain gear 22 and the main rope chain gear 32 are synchronized, the interlocking chain 12 has a certain amount of slack in the upper and lower central portions thereof, and a pair of sheaves provided facing each other up and down. It moves to the left without touching any of the slip detection switches 13 (in FIG. 2).

Here, if the car 1 and the hanging weight 2 are locked and the movement of the main rope 14 is stopped, the rotation of the main rope roller 31 is stopped. This also stops the rotation of the main rope chain gear 32. However, since the sheave 5 continues to rotate in the clockwise direction, the sheave sheave roller 21 and the sheave chain gear 22 also continue to rotate counterclockwise. For this reason, the slack part in the center upper portion of the interlocking chain 12 is pulled, and the pulled upper surface of the interlocking chain 12 on the upper side pushes up the upper detection switch 42 to operate the sheave and idle rotation detection switch 13. The signal from the sheave idling detection switch 13 is output to a control device (not shown) in the machine room, and the control device determines that the sheave 5 is idling and rotates the sheave 5, that is, the hoist 3 A command is issued to the hoisting machine 3 to stop the driving of. By this, sheave 5
It is possible to stop the rotation of the vehicle, and it is possible to prevent abnormal friction between the main rope and the sheave even in an elevator without a deflector.

Embodiment 2 FIG. FIG. 8 is a front view of a main rope sliding rotating body with a built-in heat sensing element of the idling prevention device for an elevator sheave according to the second embodiment, and FIG. 9 is a sectional view taken along line M1-M2 of FIG. is there.

In the idling prevention device for an elevator sheave according to the first embodiment, as shown in FIG. 2, a sheave sliding roller 21 and a main rope sliding roller 31 which detect the tension state of the interlocking chain and rotate in an interlocking manner. However, the slip prevention device of the elevator sheave according to the present embodiment detects the friction heat between the main rope sliding roller 31 and the main rope chain gear 32. The idle rotation of the sheave 5 is detected by detecting the out-of-step rotation between the sheave sliding roller 21 and the main rope sliding roller 31 that rotate in conjunction with each other. The other configurations are the same as those in the first embodiment.

That is, in the present embodiment, the main rope sliding rotating body 50 includes the main rope sliding roller 31 which rotates in contact with the main rope 14 and the main rope sliding roller 31 which is coaxial with the main rope sliding roller 31 and is capable of slipping. The main rope chain gear 32 fixed to the shaft 33 on the moving roller 31. Also,
Main rope sliding roller 31 and main rope chain gear 51
Have linings 53 and 54 fixed to the surfaces in contact with each other. Further, in the vicinity of the lining 53 of the main rope sliding roller 31, a heat sensing element 52 that detects friction heat between the lining 53 and the lining 54 due to slip of the main rope chain gear 51 due to idling of the sheave 5 is built in. ing.

Next, the operation of the slip prevention device for an elevator sheave according to this embodiment will be described with reference to FIGS. 1 and 9.

Similar to the first embodiment, when the car 1 and the suspension weight 2 are locked while the elevator is traveling, the rotation of the main rope sliding roller 31 is stopped, but the sheave 5 continues to rotate. Therefore, the sheave wheel chain gear 22 continues to rotate together with the sheave wheel sliding roller 21, and the rotational force of the sheave wheel chain gear 22 is transmitted to the main rope chain gear 51 via the interlocking chain 12. The slip of the main rope chain gear 51 causes the lining 53 and the lining 54 to slide and generate heat. This heat generation is detected by the heat sensing element 52 built in the vicinity of the lining 53, and the heat sensitive output from the heat sensing element 52 is input to the control device (not shown) in the machine room. As a result, the control device determines that the sheave 5 is idling and stops the rotation of the sheave 5, that is, the drive of the hoisting machine 3.

Therefore, according to the present embodiment, unlike the first embodiment, since it is not necessary to detect the slack of the interlocking chain 12, the sheave of the sheave sliding body 10 and the main rope sliding rotation of the heat sensing element 52 are incorporated. Even if the straight line connecting both axes of the body 50 does not appear parallel, even if the straight line is vertical, it is possible to detect the idling of the sheave 5 and prevent abnormal friction between the main rope and the sheave 5.

Embodiment 3 FIG. 10 is a front view of a main rope sliding rotary body with a built-in heat sensing element of the idling prevention device for an elevator sheave of the third embodiment, and FIG. 11 is N1- of FIG.
It is sectional drawing which followed the N2 line.

In the slip prevention device for an elevator sheave according to the first embodiment, as shown in FIG. 2, a sheave sliding roller 21 and a main rope sliding roller 31 which detect the tension state of the interlocking chain and rotate in conjunction with each other. However, the slip prevention device of the elevator sheave according to the present embodiment detects a rotation deviation between the main roller sliding roller 31 and the main rope chain gear 32. By detecting
It was decided that out-of-step rotation between the sheave wheel sliding roller 21 and the main rope sliding roller 31, which rotate indirectly in conjunction with each other, was detected, and thereby the idling of the sheave 5 was detected. For other configurations,
This is the same as the first embodiment.

That is, in the present embodiment, the main rope sliding rotating body 60 comprises a main rope sliding roller 31 which rotates in contact with the main rope 14 and a main rope sliding roller 31 which is capable of slipping coaxially with the main rope sliding roller 31. A main rope chain gear 61 fixed to the shaft 33 on the moving roller 31. Also,
Main rope sliding roller 31 and main rope chain gear 32
Have linings 64 and 65 fixed to the surfaces in contact with each other. Furthermore, lining 64 and lining 6
5, the electric contacts 62 and 63 are attached to the surfaces in contact with each other. The electrical contact 62 and the electrical contact 63 are installed at positions where they contact each other during normal operation of the elevator.

Next, the operation of the slip prevention device for an elevator sheave according to this embodiment will be described with reference to FIGS. 1 and 11.

Similar to the first embodiment, if the car 1 or the hanging weight 2 is locked while the elevator is traveling, the rotation of the main rope sliding roller 31 is stopped, but the sheave 5 continues to rotate. Therefore, the sheave sheave chain gear 22 also continues to rotate together with the sheave sheave roller 21, and the rotational force of this sheave sheave chain gear 22 is transmitted to the main rope chain gear 61 via the interlocking chain 12. Due to the slip of the main rope chain gear 61, the lining 53 and the lining 54 slide, and the positions of the electric contacts 62 and 63 are deviated from each other, resulting in non-conduction. Then, before the main rope chain gear 61 further rotates and the electric contact 62 and the electric contact 63 contact again and become conductive, a control device (not shown) in the machine room detects this non-conduction and It is determined that the rope sliding roller and the main rope chain gear are out of step rotation, and it is determined that the sheave 5 is idling. As a result, the idling prevention device for the elevator sheave of the present embodiment stops the rotation of the sheave 5, that is, the drive of the hoisting machine 3.

Therefore, according to the present embodiment, unlike the first embodiment, it is not necessary to detect the slack of the interlocking chain 12, so that the sheave of the sliding sheave 10 and the main rope sliding with the electric contacts 62, 63 built-in. Whether the straight line connecting both axes of the rotating body 60 is inclined or vertical, it is possible to detect the idling of the sheave 5 and prevent abnormal friction between the main rope and the sheave 5. Furthermore,
Unlike the second embodiment, the idling of the sheave 5 can be instantly detected.

[0039]

As described above, according to the slip prevention device for an elevator sheave according to the present invention, even if the elevator does not have a deflector sheave, the sheave sheave roller and the main rope slide roller directly drive the sheave sheave. It is possible to detect the rotation of the main rope and the movement of the main rope, and detect the step-out rotation between the sliding roller of the sheave and the sliding roller of the main rope that are interlocked with each other by the sheave idle detector to detect this idle rotation of the sheave. Since the rotation of the sheave can be stopped according to the output of the container, it is possible to prevent abnormal friction between the main rope and the sheave even in an elevator without a deflector.

Further, the slack of the interlocking ring zone for interlocking rotation of the sheave wheel sliding roller and the main rope sliding roller can be detected by a pair of sheave sheave idle detection switches arranged adjacent to each other with a part of the belt band interposed therebetween. For example, there is no need for facility investment such as adding a control cable on the car side or newly installing a control cable on the car side in the case of a dam waiter, which is excellent in economic efficiency.

Further, the heat sensing element built in the main rope sliding roller detects friction heat caused by slip of the main rope chain gear due to idling of the sheave, or the main roller sliding roller and the main rope chain. By detecting out-of-step rotation with the gears with an out-of-step rotation detector and stopping the rotation of the sheave, facility investment such as adding or attaching a control cable to the car side is not required as in the above, which is economical. Excellent in performance.

[Brief description of the drawings]

FIG. 1 is a layout view of a first embodiment of a slip prevention device for an elevator sheave according to the present invention.

FIG. 2 is a diagram showing a configuration of an idling prevention device for an elevator sheave according to the first embodiment.

3 is a cross-sectional view taken along line X1-X2 of FIG.

FIG. 4 is a diagram showing a configuration of a sheave sliding rotating body of the idling prevention device for an elevator sheave according to the first embodiment.

5 is a cross-sectional view taken along line Y1-Y2 of FIG.

FIG. 6 is a diagram showing a configuration of a main rope sliding rotating body of the idling prevention device for an elevator sheave according to the first embodiment.

7 is a sectional view taken along line Z1-Z2 of FIG.

FIG. 8 is a front view of a main rope sliding rotating body with a built-in heat sensing element of the idling prevention device for an elevator sheave according to the second embodiment.

9 is a cross-sectional view taken along line M1-M2 of FIG.

FIG. 10 is a front view of a main rope sliding rotary body with a built-in heat sensing element of an idling prevention device for an elevator sheave according to a third embodiment.

11 is a cross-sectional view taken along the line N1-N2 of FIG.

FIG. 12 is an external view of the attachment of a conventional idling prevention device for an elevator sheave.

[Explanation of symbols]

1 basket, 2 hanging weights, 3 hoisting machines, 5 sheaves,
6 Deflection wheel, 7 Machine stand, 10 Sheave rotating body, 1
1 Main rope sliding rotating body, 12 Interlocking chain, 13
Sheave slip detection switch, 14 main rope.

Claims (4)

[Claims] 1. An elevator in which a main rope, which is mounted on a sheave and which connects a basket and a suspension weight, is moved forward and backward by the rotation of the sheave so that the car travels. A sheave roller sliding roller that rotates in contact with the sheave. A main rope sliding roller that rotates in contact with the main rope and that rotates in conjunction with the sheave sliding roller, and detects out-of-step rotation of the sheave sliding roller that rotates in conjunction with the main rope sliding roller An idle sheave preventing device for an elevator sheave, comprising: a sheave sheave idle detector that stops the rotation of the sheave according to the output of the sheave idle detector. 2. An elevator in which a main rope, which is mounted on a sheave and connects a basket and a suspension weight, is moved forward and backward by the rotation of the sheave so that the car travels. A sheave roller sliding roller that rotates in contact with the sheave. A main rope sliding roller that rotates in contact with the main rope; an interlocking annular zone that interlocks the sheave sliding roller and the main rope sliding roller to rotate; and detects slack of the interlocking annular zone. An elevator characterized by having a pair of sheave idle detection switches disposed adjacent to each other with a part of the strip interposed therebetween, and stopping the rotation of the sheave when the interlocking ring comes into contact with the sheave idle detection switch. Anti-slip device for sheaves. 3. An elevator in which a main rope, which is mounted on a sheave and which connects a basket and a hanging weight, is moved forward and backward by the rotation of the sheave, thereby causing a car to travel, and a sheave roller sliding contact with the sheave, A sheave chain gear that is fixed coaxially with the sheave sliding roller, a main rope sliding roller that rotates in contact with the main rope, and a main rope chain that is slippery fixed coaxially with the main rope sliding roller A gear and an interlocking chain that connects the sheave wheel chain gear and the main rope chain gear, and the main rope sliding roller or the main rope chain gear has a slip of the main rope chain gear due to the idling of the sheave. An idling prevention device for an elevator sheave, comprising a heat sensing element for detecting the resulting frictional heat, and stopping the rotation of the sheave according to the output of the heat sensing element. 4. An elevator in which a main rope, which is mounted on a sheave and which connects a basket and a suspension weight, is moved forward and backward by the rotation of the sheave, and a car is run, wherein a sheave sliding roller in contact with the sheave, A sheave chain gear that is fixed coaxially with the sheave sliding roller, a main rope sliding roller that rotates in contact with the main rope, and a main rope chain that is slippery fixed coaxially with the main rope sliding roller A shift detector that detects a rotation shift between the main roller sliding roller and the main rope chain gear, and a shift detector that detects a shift between the main roller sliding roller and the main rope chain gear. An idling prevention device for an elevator sheave, characterized in that the rotation of the sheave is stopped according to the output of the container.