JP5963335B1 - Elevator speed detector and elevator - Google Patents

Abstract

An elevator speed detection device and an elevator capable of correctly detecting the speed of a car even when a car sways or the like occur. According to one embodiment of the present invention, a guide rail 12 having rail side surfaces 10 and 11, a car 14 guided by the rail side surfaces 10 and 11 of the guide rail 12, and the guide rail 12 on the car 14. One of the first and second rotary encoders 15 and 16 rotating on the rail side surfaces 10 and 11 around the horizontal rotation shaft held at equal intervals, respectively, and the output from the rotary encoders 15 and 16 When an output having a large rotational speed value is selected and the rotational speed value exceeds a predetermined set value, the controller 17 outputs a stop command, and the car is driven by the friction braking force applied to the guide rail 12 by the stop command from the controller 17. An elevator speed detection device is provided that includes an emergency stop device for emergency stop 14. [Selection] Figure 1

Description

  The present invention relates to an elevator speed detector and an elevator using the same.

  In the elevator, the governor rope connected to the car is wound around the governor (governor), and when the descending speed of the car exceeds the preset speed, the governor restrains the governor rope and the emergency stop device provided on the car The car is brought to an emergency stop (see, for example, Patent Document 1).

  In recent years, the number of elevators having a long lifting / lowering stroke has increased due to the increase in the number of buildings, and an elevator having a structure in which long objects are eliminated from the hoistway has been expected. As one of the long object-less elevators, introduction of a low press governor (low press governor) that brakes a car without using a governor rope is considered (for example, see Patent Document 2). It is necessary to detect an abnormality in the car speed in order to operate the emergency stop device, and an electronic safety elevator is known in which a rotary encoder is provided in the governor and the car speed is calculated as the governor rotates (see, for example, Patent Document 3). ).

JP 2010-247997 A JP 2006-151610 A JP 2014-118290 A

  However, in an elevator equipped with a governor, the car moving up and down along the guide rail may cause car sway, vibration, and unbalanced load. It cannot be detected correctly.

  The present invention was devised in view of such problems, and an object thereof is to provide an elevator speed detection device and an elevator that can correctly detect the speed of a car even when a car sways or the like occurs. .

  In order to solve such a problem, according to one embodiment of the present invention, a guide rail having one and other rail side surfaces, a car guided by the rail side surfaces of the guide rail, and the guide to the car Either of the first and second rotary encoders rotating on the side surfaces of the one and the other rails around a horizontal rotation axis held with the rails sandwiched at equal intervals, and any of the outputs from these rotary encoders When an output having a large rotational speed value is selected and the rotational speed value exceeds a predetermined setting value, a controller that outputs a stop command and a friction braking force applied to the guide rail by the stop command from the controller An elevator speed detecting device comprising: an emergency stop device for emergency stopping the car is provided. That.

  According to another embodiment of the present invention, a guide rail having one and the other rail side surface, a car guided by the rail side surface of the guide rail, the car and the counterweight are moved up and down by the main rope. A hoisting machine to be driven; and first and second rotary encoders that respectively rotate on the side surfaces of the one and the other rails around a horizontal rotation shaft held by the cage with the guide rails held at equal intervals; A controller provided in the car that selects an output having a larger rotational speed value from among the outputs from these rotary encoders and outputs a stop command when the rotational speed value exceeds a predetermined set value; The car is provided with an emergency stop by the frictional braking force applied to the guide rail by the stop command from the controller. Elevator, wherein is provided a safety device which, further comprising a.

  According to the present invention, the speed of a car can be correctly detected even when a car shakes or the like occurs.

1 is a schematic configuration diagram of an elevator according to a first embodiment of the present invention. It is a figure which shows the hoistway plane of the elevator which concerns on 1st Embodiment of this invention. It is a perspective view which shows the single example of the rotary encoder which concerns on 1st Embodiment of this invention. It is a figure showing the example of composition of the speed detector for elevators concerning a 1st embodiment of the present invention. It is a front view which shows an example of the emergency stop apparatus of the elevator which concerns on 1st Embodiment of this invention. It is a figure which shows the signal waveform example of the output signal from the 1st and 2nd rotary encoder of the elevator which concerns on 1st Embodiment of this invention. It is a top view which shows the example of arrangement | positioning of the rotary encoder used for the elevator which concerns on 2nd Embodiment of this invention.

  Hereinafter, an elevator speed detection device and an elevator according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7. In the drawings, the same portions are denoted by the same reference numerals, and redundant description is omitted.

(First embodiment)
FIG. 1 is a schematic configuration diagram of an elevator according to a first embodiment of the present invention. FIG. 2 is a diagram showing a hoistway plane of the elevator according to the present embodiment. In these drawings, the same reference numerals denote the same elements. The elevator according to this embodiment is guided by guide rails 12 and 13 each having a rail side surface 10 (one rail side surface) and a rail side surface 11 (the other rail side surface), and rail side surfaces 10 and 11 of the guide rails 12 and 13. And a basket 14 to be played. The elevator includes a rotary encoder 15 (first rotary encoder) and a rotary encoder that rotate on rail side surfaces 10 and 11 around a horizontal rotation shaft held by a car 14 with one guide rail 12 sandwiched at equal intervals. 16 (second rotary encoder).

  Further, the elevator according to the present embodiment selects an output having a larger rotational speed value from among the outputs from the rotary encoders 15 and 16, and when the rotational speed value exceeds a predetermined set value, a stop command is issued. And a left and right emergency stop devices 18 and 19 for emergency stopping the car 14 by a friction braking force to the guide rails 12 and 13 according to a stop command from the controller 17. Yes. Left and right refer to the left wall surface of the hoistway and the right wall surface of the hoistway when looking at the back of the car from the entrance of the car 14.

  The guide rails 12 and 13 are erected on the hoistway 20. The guide rail 12 has a rail top surface 27 (FIG. 2) along the vertical direction, and has one and the other rail side surfaces 10 and 11 on the sides of the rail top surface 27, respectively. The guide rail 12 has a T-shaped horizontal cross-sectional shape. Within this horizontal cross section, the guide rail 12 has a constriction in the middle part from the rail top surface 27 on the rail side surface 10 toward the rail bottom. The rotary encoders 15 and 16 rotate in each surface area of the portion from the constriction to the rail top surface 27. The shape and structure of the guide rail 13 are substantially the same as those of the guide rail 12.

  The car 14 is connected to a main rope 21, and a counterweight 22 is connected to the other end of the main rope 21. The main rope 21 is wound around a hoisting machine 23, and the car 14 moves up and down the hoistway 20 together with the counterweight 22 in a sliding manner by the hoisting and unwinding driving of the hoisting machine 23. The car 14 is surrounded by a car frame 24, and a car floor 25 (FIG. 1) is provided on a lower beam 26 of the car frame 24. Under the lower beam 26, emergency stop devices 18 and 19 are provided.

  FIG. 3 is a perspective view showing an example of the rotary encoder 15 alone. The above described symbols represent the same elements. The rotary encoder 15 includes a unit case 40 that is movable with respect to the car 14 and two horizontal rotary shafts that are supported by the unit case 40 in parallel with each other and have a fixed inter-axis distance L (only one of them is shown in the figure). And an outer peripheral portion 41 around these horizontal rotation axes, and a signal generator 42 for outputting rotational speed information around the horizontal rotation axes. The rotary encoder 15 is provided with a sensor in the outer peripheral portion 41, and outputs a rotational angular velocity obtained by multiplying the rotational radial position of the sensor and the rotational angle or rotational speed detected by the sensor. The rotary encoder 16 has the same shape and structure as the rotary encoder 15 and has an outer peripheral portion 41 having the same diameter as the outer peripheral portion 41 of the rotary encoder 15.

  FIG. 4 is a diagram illustrating a configuration example of the elevator speed detection device according to the first embodiment of the present invention. This figure shows a horizontal cross-sectional structure of the elevator speed detection device by a horizontal plane passing through the position AA ′ having the same hoistway height in FIG. The unit case 40 is provided on the lower beam 26 of the car 14 so as to be horizontally displaceable. The inter-axis distance L is determined to be a constant value by the radius of the outer peripheral portion 41 and the inter-surface distance D between the rail side surfaces 10 and 11. Specifically, the outer peripheral portion 41 has a diameter that is ½ of the remaining dimension obtained by subtracting the inter-plane distance D between the rail side surfaces 10 and 11 from the inter-axis distance L. The outer peripheral portion 41 has a material having wear resistance. The outer peripheral portion 41 is held by the car 14 so as to be freely rotatable without receiving any rotational resistance force in any rotation direction. The signal generator 42 outputs, for example, a rotation speed value. The outer peripheral portion 41 of the rotary encoder 15 generates a pressing force against the rail side surface 10 due to the displacement in the distance direction between the horizontal rotation axes, and the controller 17 selects the rotation speed value of the rotary encoder 15 that has received this pressing force. To do. The pressing force is generated by car swaying, vibration, or offset load.

  The controller 17 selects the larger one of the output signal including the rotation speed value on the rail side surface 10 from the rotary encoder 15 and the output signal including the rotation speed value on the rail side surface 11 from the rotary encoder 16. To do. The function of the controller 17 is executed by software such as a CPU, a ROM, and a RAM.

  FIG. 5 is a front view showing an example of the safety device 18. FIG. 1 shows an example when the direction from A to A ′ is viewed in FIG. The above described symbols represent the same elements. The emergency stop device 18 includes a wedge 30 having a braking surface 28 on the rail side surface 10 side and an inclined surface 29 formed so as to be inclined downward from the rail side surface 10 from the upper side to the lower side. And a wedge 31 on the rail side surface 11 side having a shape. Further, the emergency stop device 18 includes wedge receivers 33 and 34 each having a pressing surface 32 for applying a force from the inclined surfaces 29 to the rail side surfaces 10 and 11 on the inclined surfaces 29 of the wedges 30 and 31, respectively. , 31, and a lift mechanism 38 that moves these lifts 36, 37 from a normal lower position to an upper position in response to a stop command from the controller 17.

  The wedge receivers 33 and 34 urge the wedges 30 and 31 toward the rail top surface 27, respectively. The pulling mechanism 38 may be provided on the lower beam 26. The pulling mechanism 38 includes, for example, a plurality of wires each having one end connected to the lifts 36 and 37, an electric actuator connected to each other end of the wires, and a drive circuit for the electric actuator. The safety device 19 on the side of the guide rail 13 has substantially the same structure as the structural example of the safety device 18.

  Next, the operation of the elevator (FIGS. 1 to 5) according to this embodiment having the above-described configuration will be described.

  At the time of elevator installation or inspection, an operator first attaches the unit case 40 having the two rotary encoders 15 and 16 to the car 14. Two rotary encoders 15 and 16 are arranged so as to sandwich the guide rail 12 therebetween. Further, the distance between the two rotary encoders 15 and 16 in the unit case 40 is fixed, and these rotary encoders 15 and 16 are arranged with the distance L between the two rotating shafts as measured by the operator. . The unit case 40 itself is movable in the left-right direction.

  FIG. 6 is a diagram illustrating signal waveform examples of output signals from the rotary encoders 15 and 16. A waveform A represented by a solid line is a detection signal of the first rotary encoder 15. A waveform B represented by a broken line is a detection signal of the second rotary encoder 16. The horizontal axis represents the height position in the hoistway 20. The vertical axis represents the detected rotation speed value (detection speed).

  At the start of traveling, the rotary encoders 15 and 16 output the same signal waveform (see I in FIG. 6). The elevator control unit 39 determines the destination floor according to the car position and the car call from each floor, and causes the car 14 to travel from the departure floor to the destination floor in a determined speed pattern. The speed pattern of the car 14 changes at a constant acceleration from the start of travel, reaches the rated speed, maintains this rated speed for a while, and then stops at the destination floor while decreasing the speed at a constant deceleration. In the rotary encoder 15, the outer peripheral portion 41 comes into contact with the guide rail 12 on the right side when viewed from above (FIG. 3), and is driven to rotate on the rail side surface 10. The rotary encoder 16 is driven to rotate on the left side with the outer peripheral portion 41 contacting the rail side surface 11.

  The car 14 shakes and vibrates due to passengers getting on and off or increasing the number of passengers. Due to the deviation of the position of the passenger on the car floor 25, an uneven load is generated in the car 14. The rotary encoders 15 and 16 are displaced in the direction of the distance between the horizontal axes due to the car swaying, vibrating, or offset load of the car 14. Since the distance between the horizontal rotation axes is set to the distance L, a pressing force is generated on one of the rail side surfaces 10 and 11 due to the displacement. Due to the displacement of the rotary encoder 15 to the right or left (FIG. 3), the rotary encoder 16 is also displaced to the right or left. For example, when the rotary encoders 15 and 16 are displaced to the left side (FIG. 3) due to a car shake or the like, the rotary encoder 15 is separated from the rail side surface 10. When the driven rotation of the rotary encoder 15 by the rail side surface 10 is interrupted, the value of the waveform A falls. The rotary encoder 16 continues to output a constant waveform B (see II in FIG. 6). The controller 17 selects a waveform B having a large rotation speed value among the waveforms A and B. That is, the controller 17 selects the waveform B of the rotary encoders 15 and 16 that has received the pressing force.

  When the car sway does not continue and the horizontal displacements of the rotary encoders 15 and 16 return to the uniform position, the rotary encoder 15 comes into contact with the rail side surface 10 and resumes the driven rotation. The value of waveform A rises again, and rotary encoders 15 and 16 continue to output waveforms A and B having the same value (see III in FIG. 6).

  Further, when the rotary encoders 15 and 16 are displaced to the right side (FIG. 3) due to a car shake or the like, the rotary encoder 16 is separated from the rail side surface 11 and the value of the waveform B falls. On the other hand, the rotary encoder 15 outputs a waveform A (see IV in FIG. 6). The controller 17 selects the waveform A that has been pressed by the guide rail 12.

  The rotary encoder 16 resumes the driven rotation on the rail side surface 11 due to the disappearance of the car shake or the like. The value of the waveform A rises again, and the rotary encoders 15 and 16 output the waveforms A and B having the same value (see V in FIG. 6). Thereafter, the values of the waveforms A and B become zero due to the landing of the car 14 on the destination floor.

  As described above, the controller 17 uses the higher value of the detection values of the two rotary encoders 15 and 16 as the positive detection value, and obtains the speed information of the car 14.

  Assuming that only one rotary encoder 15 is attached to the car 14, when the car sways in the direction in which the rotary encoder 15 moves away from the rail side surface 10, the rotary encoder 15 has insufficient pressing force. As shown in the waveform drop example II or IV in FIG. 6, the value of the detected waveform A by the rotary encoder 15 decreases. The controller 17 detects a value lower than the actual value due to a decrease in the pressing force of the rotary encoder 15, and the controller 17 cannot detect the correct car speed. That is, if only one rotary encoder is provided for one guide rail 12, there is a risk that a car speed lower than the actual car speed is detected.

  According to the elevator speed detection device and the elevator according to the present embodiment, even when the car sways, either one of the two rotary encoders 15 and 16 is always pressed against the guide rail 12, By using the maximum value of the two output rotation speed values as the detection value, the correct car speed can be detected. Even when the pressing force of the rotary encoders 15 and 16 against the guide rail 12 becomes excessive, the rotary encoders 15 and 16 do not output a value higher than the rotational speed value at the time of driven rotation. A value higher than the actual car speed is never detected. In the elevator speed detection device and the elevator according to the present embodiment, the values of the rotary encoders 15 and 16 can be monitored without risk of erroneous detection.

  Further, the controller 17 constantly compares the detected value of the detected value of the rotary encoders 15 and 16 with the higher value of the car descending speed threshold. If the higher detection value exceeds the threshold value due to the lowering of the car 14, the controller 17 notifies the emergency stop devices 18 and 19 of a stop command to the pulling mechanism 38. As shown in FIG. 5, when the emergency stop device 18 lifts the lifts 36 and 37 upward by the pulling mechanism 38, the wedges 30 and 31 move upward, and the wedges 30 and 31 sandwich the guide rail 12. The left braking surface 28 and the right braking surface 28 are pressed against the rail side surfaces 11 and 10, respectively, and a frictional force is generated. The wedges 30 and 31 are pushed up by the frictional force and are press-fitted into the gap between the pair of wedge receivers 33 and 34 and the guide rail 12. The car 14 decelerates and stops safely.

  By providing the controller 17 in the car 14 without providing it in the elevator control unit 39, it is possible to immediately cope with an abnormality in the car 14. Even if data exchange between the car 14 and the elevator control unit 39 is interrupted, an abnormality can be dealt with.

  Thus, according to the elevator speed detection device and the elevator according to the present embodiment, the speed of the car 14 can be correctly detected even when car swaying or the like occurs in a configuration that does not use a governor rope. . The speed of the car 14 can be correctly detected in an elevator having a low press governor configuration in which the car 14 is braked without using the governor and the governor rope.

(Second Embodiment)
In the first embodiment, the rotary encoders 15 and 16 are provided in the car 14 via the unit case 40, but can be provided in another location of the rotary encoders 15 and 16. Unless otherwise specified, the elevator speed detector and the elevator according to the second embodiment of the present invention have the same configuration and output as the configurations and outputs of FIGS.

  FIG. 7 is a top view showing an arrangement example of the rotary encoder used in the elevator according to the second embodiment of the present invention. The above described symbols represent the same elements.

  The elevator according to this embodiment includes a base 43 provided on the car frame 24 and rail horizontal surfaces 11 around the horizontal rotation shaft provided on the base 43 and held by the base 43 with the guide rails 12 sandwiched at equal intervals. 10, first and second guide rollers 45, 46 that rotate on the top 10, and a third guide roller 47 that rotates on the rail top surface 27. These rotary encoders 15 and 16 rotate together with these guide rollers 45 and 46. The guide roller 47 may be provided with a rotary encoder 48 having the same structure as the rotary encoder 15. Each of the guide rollers 45, 46, 47 has a horizontal rotation shaft by a bearing (not shown) on the base 43 and is held around the horizontal rotation shaft. The rotary encoders 15, 16, and 48 are provided with a signal generator 42 (not shown) so that a detection signal is sent from the signal generator 42 to the controller 17. The elevator also includes a base 43 and guide rollers 45, 46 and 47 on the guide rail 13.

  In the elevator speed detecting apparatus and elevator according to the present embodiment having such a configuration, when the guide rollers 45 and 46 are displaced upward in FIG. The value of the waveform A from the rotary encoder 15 drops away from the side surface 10. The guide roller 46 continues to output a constant waveform B. The same applies to the case where the guide rollers 45 and 46 are displaced downward in the figure. Further, the output from the guide roller 47 continues to output a constant value unless the base 43 is separated from the rail top surface 27 of the guide rail 12. The controller 17 selects the output having the largest rotational speed value among the outputs from the rotary encoders 15 and 16 and the additional rotary encoder 48 in FIG.

  According to the elevator speed detection device and the elevator according to the present embodiment, a rotary encoder is added to the existing guide rollers 45, 46, and 47 in the car 14, and the speed of the car 14 can be increased in a low press governor configuration elevator by a simple configuration. It can be detected correctly.

(Modification)
In the above embodiments, the rotary encoders 15 and 16 may be provided on the guide rail 13 instead of the guide rail 12. Alternatively, a pair of rotary encoders 15 and 16 are provided on both of the guide rails 12 and 13, and four rotational speed values rotating on the rail side surfaces 10 and 11 of the guide rail 12 and the rail side surfaces 10 and 11 of the guide rail 13 respectively. The maximum value may be monitored.

  In each embodiment, the one that outputs a larger rotational speed value is selected from the two or three rotary encoders 15 or the like. However, when a plurality of rotary encoders 15 or the like output the same rotational speed value, Initial setting may be made so that the output signal of the rotary encoder 15 is selected on condition that there is no abnormal operation.

  In the second embodiment, one speed value is selected from three rotary encoders. However, when four or more rotary encoders are provided, the largest rotation among the rotation speed values from the four or more rotary encoders. Select the speed value signal. When these rotary encoders output the same rotation speed value, an initial setting may be made so as to select an output signal of any one rotary encoder such as the first rotary encoder.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. The hoistway arrangement in FIGS. 1 and 2 is an example, and the arrangement of elements constituting the elevator in the hoistway 20 can be variously modified. For example, the superiority of the elevator according to the present embodiment is not deteriorated at all with respect to a product that is simply implemented by changing a hoistway plane shape, a car shape, roping, and the like.

  In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

  DESCRIPTION OF SYMBOLS 10 ... Rail side surface (one rail side surface), 11 ... Rail side surface (the other rail side surface), 12, 13 ... Guide rail, 14 ... Car, 15 ... Rotary encoder (1st rotary encoder), 16 ... Rotary encoder ( (Second rotary encoder), 17 ... controller, 18, 19 ... emergency stop device, 20 ... hoistway, 21 ... main rope, 22 ... counterweight, 23 ... hoisting machine, 24 ... car frame, 25 ... car floor, 26 ... Lower beam, 27 ... Rail top surface, 28 ... Braking surface, 29 ... Inclined surface, 30, 31 ... Wedge, 32 ... Pressing surface, 33, 34 ... Wedge receiver, 36, 37 ... Lift, 38 ... Lifting mechanism, DESCRIPTION OF SYMBOLS 39 ... Elevator control part, 40 ... Unit case (housing), 41 ... Outer peripheral part, 42 ... Signal generator, 43 ... Base, 45 ... Guide roller (1st guide roller), 46 ... Guide roller The second guide roller), 47 ... guide roller (third guide rollers), 48 ... rotary encoder.

Claims (10)

A guide rail having one and other rail sides;
A car guided by the rail side surface of this guide rail,
First and second rotary encoders rotating on the side surfaces of the one and the other rails, respectively, around a horizontal rotation axis held by holding the guide rails at equal intervals in the cage;
A controller that selects an output having a larger rotational speed value from among the outputs from these rotary encoders, and outputs a stop command when the rotational speed value exceeds a predetermined set value;
An emergency stop device for emergency stop of the car by the friction braking force to the guide rail by the stop command from the controller;
An elevator speed detection apparatus comprising: The outer peripheral portion of one of the first rotary encoder and the second rotary encoder has a pressing force against the rail side surface due to displacement in the distance direction between the horizontal rotation axes,
The elevator speed detection device according to claim 1, wherein the controller selects the rotation speed value of the first rotary encoder and the second rotary encoder that has received the pressing force. .   The controller outputs an output signal including a rotational speed value on the one rail side surface from the first rotary encoder and an output signal including a rotational speed value on the other rail side surface from the second rotary encoder. The elevator speed detecting device according to claim 1 or 2, wherein one having a larger rotational speed value is selected. The first rotary encoder and the second rotary encoder are:
A housing movable relative to the car;
The horizontal rotation shaft that is supported in parallel with each other in this housing and the distance between the shafts is fixed;
An outer peripheral portion having the same diameter around the horizontal rotation axis;
The elevator speed detection apparatus according to claim 1, further comprising a signal generator that outputs rotation speed information about the horizontal rotation axis.   5. The elevator speed according to claim 4, wherein the outer peripheral portion has a diameter that is half the value of the remaining dimension obtained by subtracting the inter-plane distance between the one and the other rail side surfaces from the inter-axis distance. Detection device. The emergency stop device is
A wedge having a braking surface on the rail side surface of one of the one and the other rail side surfaces and an inclined surface formed to be inclined in a direction away from the rail side surface from above to below;
A wedge receiver having a pressing surface for applying a force from the inclined surface to the rail side surface on the inclined surface of the wedge;
A lift connected to the wedge;
The elevator speed detecting apparatus according to claim 1, further comprising a pulling mechanism that moves the lift from the lower position at a normal time to the upper position by the stop command. A base provided in the car frame,
A first guide roller and a second guide roller which are provided on the base and which are respectively rotated on the side surfaces of the one and the other rails around a horizontal rotation axis which is held by the base with the guide rails sandwiched at equal intervals; Prepared,
2. The elevator speed detecting device according to claim 1, wherein the rotary encoders rotate together with the first and second guide rollers. A guide rail having one and other rail sides;
A car guided by the rail side surface of this guide rail,
A hoisting machine that drives the cage and counterweight up and down by a main rope;
First and second rotary encoders that respectively rotate on the side surfaces of the one and the other rails around a horizontal rotation axis held by holding the guide rails at equal intervals in the cage;
A controller provided in the car that selects an output having a larger rotational speed value from among the outputs from these rotary encoders and outputs a stop command when the rotational speed value exceeds a predetermined set value; ,
An emergency stop device provided in the car for emergency stop of the car by a friction braking force to the guide rail by the stop command from the controller;
An elevator characterized by comprising: The outer peripheral portion of one of the first rotary encoder and the second rotary encoder has a pressing force against the rail side surface due to displacement in the distance direction between the horizontal rotation axes,
The elevator according to claim 8, wherein the controller selects the rotation speed value of the first rotary encoder and the second rotary encoder that has received the pressing force.   The controller outputs an output signal including a rotational speed value on the one rail side surface from the first rotary encoder and an output signal including a rotational speed value on the other rail side surface from the second rotary encoder. 10. The elevator according to claim 8 or 9, wherein one having a larger rotational speed value is selected.

Images