WO2018220752A1

WO2018220752A1 - Brake device for elevator driving machines

Info

Publication number: WO2018220752A1
Application number: PCT/JP2017/020281
Authority: WO
Inventors: 聖史深貝
Original assignee: 三菱電機株式会社
Priority date: 2017-05-31
Filing date: 2017-05-31
Publication date: 2018-12-06

Abstract

At the start of the initial operation of this brake device 10 for elevator driving machines, first and second pins 62, 93 slide inside first grooves 92a, 92e when a rod 60 slides together with a piston 30. Once the wear of a brake pad 70 has progressed to the point that the brake pad 70 is thinner than a certain prescribed thickness, the first pin 62 enters a second groove 92b via a first communication groove 93a when the piston 30 moves in a direction approaching a disc 80. Similarly, the second pin 63 enters a second groove 92f via a first communication groove 93d. As a result, the rod 60 is screwed toward a spring case part 21 with respect to the piston 30 by an amount corresponding to the angle of rotation thereof, and the position of the brake pad 70 is adjusted in the direction approaching the disc 80.

Description

Brake device for elevator drive

The present invention relates to a brake device for an elevator drive machine that brakes by pressing a braking piece against a braked portion.

In order to brake a drive machine such as an elevator hoisting machine, a brake device for an elevator drive machine is known in which a brake pad as a brake piece is pressed against a brake disk as a braked portion to brake by a frictional force. In this brake system for an elevator drive machine, when the brake pad is worn, the gap between the brake disk and the brake pad is widened and the braking force is reduced.

The brake device for an elevator drive machine described in Patent Document 1 includes a plunger and a brake lever that contacts the lower surface of the plunger and rotates by movement of the plunger. A contact surface with multiple steps is provided on the lower surface of the plunger, and when the brake pad wears and becomes thin, the plunger and brake lever are brought into contact with each other at different contact surfaces to adjust the position of the plunger. By doing so, the gap between the brake pad and the disc is automatically adjusted.

JP 2008-7217 A

However, in the elevator drive machine brake device described in Patent Document 1, the position of the plunger is adjusted by a change in contact between the plunger and the brake lever, so that the application is applied to an elevator drive machine brake device that does not have a brake lever. There was a problem that it was not possible.

The present invention has been made to solve such problems, and provides a brake device for an elevator drive machine that automatically adjusts a gap between a brake pad and a disc without having a brake lever. The purpose is to do.

In order to solve the above-described problem, an elevator drive machine brake device according to the present invention includes a fixed portion, a first movable portion that is movable with respect to the fixed portion, and a first portion that is separated from the first fixed portion. A first urging portion that presses and moves the movable portion; a second movable portion that is connected to the first movable portion and is movable together with the first movable portion; a braking piece provided on the second movable portion; A braked part to which the piece is pressed and a position adjusting part that moves the position of the second movable part relative to the first movable part in a direction away from the fixed part when the thickness of the brake piece decreases.

The brake device for an elevator drive machine according to the present invention is connected to the first movable part, and is movable together with the first movable part, the brake piece provided on the second movable part, and the brake piece is pressed And a position adjusting unit that moves the position of the second movable part with respect to the first movable part in a direction away from the fixed part when the thickness of the brake piece is reduced. Even without this, the adjustment of the gap between the brake piece and the disc can be automatically performed.

It is sectional drawing of the brake device for elevator drives which concerns on Embodiment 1 of this invention. It is the schematic of the guide shown in FIG. 1 seen from the arrow A direction of FIG. FIG. 3 is a schematic view of the guide viewed from the direction of the BB line and the B′-B ′ line in FIG. 2. It is the schematic when a pin approachs into the 2nd groove | channel of the guide shown in FIG. It is the schematic of the position adjustment part shown in FIG. 2 when a pin approachs into the 2nd groove | channel of a guide. It is the schematic of the position adjustment part which concerns on Embodiment 2 of this invention.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the accompanying drawings.
1 is a cross-sectional view of an elevator drive machine brake device according to Embodiment 1 of the present invention.

The elevator driving machine brake device 10 constitutes an elevator driving machine brake device provided in an elevator driving machine such as an elevator hoisting machine. The casing 20 of the elevator drive brake device 10 is formed by joining a hollow substantially cylindrical spring case portion 21 and a hollow substantially cylindrical piston case portion 22 having an outer diameter and an inner diameter larger than the spring case portion 21. It is configured. The spring case portion 21 constitutes a fixed portion.

The piston 30 is accommodated inside the piston case portion 22 so as to slide on the inner diameter 23 of the piston case portion 22 and move relative to the housing 20. The piston 30 constitutes a first movable part. The piston case part 22 is provided with a partition wall 24 perpendicular to the sliding direction of the piston 30, and the partition wall 24 has a communication hole 26 for communicating the space 25 surrounded by the inner diameter 23 and the outside 11 of the piston case part 22. Is provided. A protrusion 31 provided on the piston 30 is slidably inserted into the communication hole 26.

The space 25 is filled with oil. In addition, an orifice 40 that connects the space 25 and an external oil tank (not shown) is provided, and oil is discharged from the space 25 or injected into the space 25 via the orifice 40, The piston 30 slides due to the pressure. The space 25 may be filled with a fluid such as other liquid or air that slides the piston 30 with pressure instead of oil.

A first spring 50 and a second spring 51 are provided inside the spring case portion 21. One end of each of the first spring 50 and the second spring 51 is connected to the bottom surface 27 of the spring case portion 21, and the other end is connected to the piston 30. The first spring 50 and the second spring 51 apply a pressing force to the piston 30 so as to be separated from the spring case portion 21, and constitute a first biasing portion that presses and moves the piston 30.

A rod 60 is provided inside the piston 30. The rod 60 is provided through the partition wall 24 and the spring case portion 21, and a brake pad 70 is connected to an end portion on the side close to the partition wall 24. The brake pad 70 constitutes a braking piece, and the brake pad 70 is pressed against the disk 80 constituting the braked portion by the movement of the rod 60. A first screw portion 32 is provided inside the piston 30, and a second screw portion 61 is provided outside the rod 60, and is screwed into the first screw portion 32. Thereby, the rod 60 is rotatably connected to the piston 30. Since the rod 60 is connected to the piston 30, the rod 60 can move together with the piston 30 in a direction away from the spring case portion 21, that is, in a direction close to the disk 80, and constitutes a second movable portion.

A ring-shaped guide 90 is provided outside the bottom surface 27. The guide 90 is formed with a flange-shaped attachment portion 91 parallel to the bottom surface 27, and the attachment portion 91 is fixed to the bottom surface 27. Further, the guide 90 includes a groove installation portion 92 formed perpendicular to the bottom surface 27, that is, parallel to the longitudinal direction of the rod 60.

The rod 60 is provided with a first pin 62 and a second pin 63 perpendicular to the longitudinal direction of the rod 60. The first pin 62 and the second pin 63 are inserted into a groove, which will be described later, provided in the groove setting portion 92. As shown in FIG. 2, which is a view of the guide 90 viewed from the direction of arrow A in FIG. 1, one end 94a of the first pin spring 94 is connected to the mounting portion 91, and the other end 94b of the first pin spring 94 is the first. Connected to pin 62. Further, one end 95 a of the second pin spring 95 is connected to the attachment portion 91, and the other end 95 b of the second pin spring 95 is connected to the second pin 63. The first pin 62, the second pin 63, the guide 90, the first pin spring 94 and the second pin spring 95 constitute a position adjusting unit 96. The first pin spring 94 constitutes a second urging portion that urges the first pin 62 in the clockwise direction around the rod 60, and the second pin spring 95 urges the second pin 63 against the rod 60. A second urging portion that urges in the clockwise direction around the center is configured.

As shown in FIG. 3, which is a view of the guide 90 viewed from the BB line and the B′-B ′ line in FIG. 2, the first pin 62 is inserted into the groove installing portion 92 as shown in FIG. A plurality of parallel first to fourth grooves 92a to 92d provided in the moving direction of the rod 60 that coincides with the arrow A in FIG. 1, and mutually parallel first to fourth grooves 92a to 92d that connect the first to fourth grooves 92a to 92d. To third communication grooves 93a to 93c. Further, the first to fourth grooves are inserted into the groove mounting portion 92 on the side facing the first to fourth grooves 92a to 92d and the first to third communication grooves 93a to 93c. The first to fourth grooves 92e to 92h and the first to third communication grooves 93d to 93f having the same shapes as the 92a to 92d and the first to third communication grooves 93a to 93c are provided.

The distal side from the mounting portion 91 is one end of the first to fourth grooves 92a to 92d and the first to fourth grooves 92e to 92h, and the proximal side is the first to fourth grooves 92a to 92d and the first to fourth grooves. Assuming that the other ends of the grooves 92e to 92h are arranged in order of increasing distance from the mounting portion 91, one end of the

first grooves

92a and 92e, one end of the

second grooves

92b and 92f, one end of the

third grooves

92c and 92g, and the

fourth grooves

92d and 92h. The first to fourth grooves 92a to 92d and the first to fourth grooves 92e to 92h are provided. The first to third grooves 92a to 92c and the

second grooves

92a and 92f, the other ends of the

second grooves

92b and 92f, and the

third grooves

92c and 92g are arranged in order of distance from the mounting portion 91. The first to third grooves 92e to 92g are provided.

The first connecting

grooves

93a and 93d connect the other ends of the

first grooves

92a and 92e and a position slightly separated from the other ends of the

second grooves

92b and 92f. The first connecting

grooves

93a and 93d One

groove

92a, 92e is formed to be V-shaped. Similarly, the

second communication grooves

93b and 93e connect the other ends of the

second grooves

92b and 92f and a position slightly apart from the other ends of the

third grooves

92c and 92g, and the

second communication grooves

93b and 93e. And the

second grooves

92b and 92f are formed to be V-shaped. Similarly, the

third communication grooves

93c and 93f connect the other end of the

third grooves

92c and 92g and the other end of the

fourth grooves

92d and 92h, and the

third communication grooves

93c and 93f and the

third groove

92c and 92g are formed to be V-shaped.

Next, the operation of the embodiment of the present invention will be described with reference to FIGS. 1 to 5 of the accompanying drawings.
As shown in FIG. 1, when the brake of the elevator drive machine brake device 10 is released, oil is injected into the space 25 via the orifice 40. Then, the pressure in the space 25 rises, and the piston 30 is moved by the oil by the first spring 50 and the second spring 51 rather than the pressing force urged in the direction in which the piston 30 is separated from the spring case 21. The force biased in the direction approaching 21 becomes larger. Then, since the piston 30 and the rod 60 connected thereto move in the direction approaching the bottom surface 27, the brake pad 70 moves in a direction away from the disk 80. As a result, the brake on the disk 80 is released.

Further, when the brake device 10 for the elevator drive machine is braked, the oil is discharged from the space 25 via the orifice 40. Then, the pressure in the space 25 decreases, and the pressing force urged in the direction in which the piston 30 is separated from the spring case portion 21 by the first spring 50 and the second spring 51 causes the piston 30 to move to the spring case by the oil. It becomes larger than the force urged in the direction approaching the portion 21. Since the piston 30 and the rod 60 connected to the piston 30 move in the direction approaching the disk 80, a pressing force is applied to the brake pad 70 via the rod 60, and the brake pad 70 approaches the disk 80. Move to. As a result, the brake pad 70 is pressed against the disk 80, and the brake for the disk 80 is operated by the frictional force between the brake pad 70 and the disk 80.

The moving range of the piston 30 is limited to the sliding range between the piston 30 and the inner diameter 23 of the piston case portion 22. Further, since the brake pad 70 is pressed and rubbed against the disk 80, when the brake device 10 for an elevator drive machine performs a braking operation, the brake pad 70 gradually wears and becomes thin. Therefore, as the brake pad 70 becomes thinner, the sliding amount of the piston 30 required to press the brake pad 70 against the disk 80 increases. Further, when the brake pad 70 becomes thinner than a predetermined thickness, the brake pad 70 is not sufficiently pressed against the disk 80 even if the piston 30 moves to the limit of the moving range in the direction approaching the disk 80.

Here, at the start of the initial operation of the elevator drive machine brake device 10, as shown in FIG. 3, the first pin 62 is inserted into the first groove 92a, and the second pin 63 is inserted into the first groove 92e. Yes. When the rod 60 slides together with the piston 30, the brake pad 70 (see FIG. 1) has not yet been worn and has a thickness greater than a predetermined thickness. The pin 62 slides in the first groove 92a, and the second pin 63 slides in the first groove 92e.

When the wear of the brake pad 70 becomes thinner than the predetermined thickness, the sliding amount when the piston 30 slides in the direction approaching the disk 80 is increased as shown in FIG. Since the amount of movement of the rod 60 in the direction approaching the disk 80 also increases, the first pin 62 slides to the other end of the first groove 92a, that is, the entrance of the first connecting groove 93a, as shown in FIG. To do. As shown in FIG. 2, the first pin 62 is biased clockwise by the first pin spring 94, that is, toward the second groove 92b. Due to this biasing, as shown in FIG. 4, the first pin 62 enters the second groove 92b adjacent to the first groove 92a via the first communication groove 93a.

Similarly, when the piston 30 slides in the direction approaching the disk 80 as shown in FIG. 1, the second pin 63 is moved to the other end of the first groove 92e, that is, the entrance of the first communication groove 93d as shown in FIG. To slide. As shown in FIG. 2, the second pin 63 is biased clockwise by the second pin spring 95, that is, toward the second groove 92f. Due to this urging, as shown in FIG. 4, the second pin 63 enters the second groove 92f adjacent to the first groove 92e via the second communication groove 93d.

When the first pin 62 enters the second groove 92b and the second pin 63 enters the second groove 92f, the rod 60 moves from the

first grooves

92a and 92e to the

second grooves

92b and 92f as shown in FIG. Rotate clockwise at a rotation angle defined by the distance to. As shown in FIG. 1, the second screw portion 61 of the rod 60 is screwed into the first screw portion 32 of the piston 30, and the rod 60 is rotatably connected to the piston 30. The piston 30 is screwed in a direction away from the spring case portion 21 by an angle. When the rod 60 is screwed in a direction away from the spring case portion 21, the position of the brake pad 70 moves in a direction closer to the disk 80.

Next, as shown in FIG. 4, when the rod 60 slides together with the piston 30, the first pin 62 slides in the second groove 92b, and the second pin 63 slides in the second groove 92f. Since the

second grooves

92b and 92f are closer to the mounting portion 91 than the

first grooves

92a and 92e, that is, closer to the disk 80 (see FIG. 1), even if the rod 60 is screwed and moved, The sliding of the 2-pin 63 is not hindered.

Next, when the thickness of the brake pad 70 is further reduced by the progress of wear, the sliding amount when the piston 30 slides in the direction approaching the disk 80 is increased as shown in FIG. Since the amount of movement of the rod 60 in the direction approaching the disk 80 also increases, as shown in FIG. 4, the first pin 62 passes through the second communication groove 93b and is adjacent to the second groove 92b. The second pin 63 enters the third groove 92g adjacent to the second groove 92g via the second connecting groove 93e. Then, the rod 60 rotates clockwise at a rotation angle defined by the distance from the

second grooves

92b and 92f to the

third grooves

92c and 92g, and the rod 60 is the spring case portion 21 with respect to the piston 30 by the rotation angle. It is screwed in the direction away from. As a result, the position of the brake pad 70 is adjusted in the direction approaching the disc 80.

Next, similarly, when the thickness of the brake pad 70 is further reduced by the progress of wear, the first pin 62 is moved to the fourth groove 92d adjacent to the third groove 92c, and the second pin 63 is moved to the third groove 92g. Enters the fourth groove 92h adjacent to. Then, the rod 60 rotates clockwise at a rotation angle defined by the distance from the

third grooves

92c, 92g to the

fourth grooves

92d, 92h, and the rod 60 is the spring case portion 21 with respect to the piston 30 by the rotation angle. It is screwed in the direction away from. When the thickness of the brake pad 70 is decreased by the above operation, the rod 60 moves in a direction away from the spring case portion 21, so that the brake pad 70 moves closer to the disk 80, and the brake pad 70 Adjustment of the gap with the disk 80 is automatically performed.

As described above, in the elevator drive machine brake device 10, the spring case portion 21, the piston 30 movable with respect to the spring case portion 21, and the piston 30 are pressed and moved away from the spring case portion 21. First and

second springs

50 and 51, a rod 60 connected to the piston 30 and movable with the piston 30, a brake pad 70 provided on the rod 60, a disk 80 against which the brake pad 70 is pressed, and a brake When the thickness of the pad 70 is reduced, the position adjustment unit 96 that moves the position of the rod 60 with respect to the piston 30 in the direction away from the spring case unit 21 is provided. The clearance between the brake pad 70 and the disk 80 can be automatically adjusted.

The piston 30 includes a first screw portion 32, the rod 60 includes a second screw portion 61, the first screw portion 32 and the second screw portion 61 are screwed together, and the rod 60 rotates with respect to the piston 30. The position adjusting unit 96 can move the position of the rod 60 by rotating the rod 60 with respect to the piston 30, so that the position of the rod 60 can be moved with respect to the piston 30 with a simple configuration. it can.

The position adjusting unit 96 includes a guide 90 provided on the spring case portion 21, first and second pin springs 94 and 95 provided on the guide 90, and first and second pins provided on the rod 60. 62, 63, the first and second pin springs 94, 95 are connected to the first and

second pins

62, 63, and the guide 90 is a plurality of first to second pins provided in the moving direction of the rod 60. 4 grooves 92a to 92h, and first to third connecting grooves 93a to 93f that connect adjacent first to fourth grooves 92a to 92h, and the

first grooves

92a and 92e have first and second grooves. The

pins

62 and 63 are inserted, and the first and second pin springs 94 and 95 bias the first and

second pins

62 and 63 so that the rod 60 is biased in the direction of rotation with respect to the piston 30. , The first and

second pins

62 and 63 correspond to the first groove 92a, 2e, when the thickness of the brake pad 70 is reduced, the rod 60 is rotated by the urging force of the first and second pin springs 94 and 95 so that the first and

second pins

62 and 63 are in the first communication groove. Since it moves to the adjacent

second grooves

92b and 92f via 93a and 93d, the gap between the brake pad 70 and the disk 80 can be automatically adjusted.

In the first embodiment, the first to fourth grooves 92a to 92d and the first to fourth grooves 92e to 92h are provided in the groove setting portion 92. However, the first to fourth grooves 92a of the groove setting portion 92 are provided. A label is provided in the vicinity of .about.92d and the first to fourth grooves 92e.about.92h, and the date on which the first and

second pins

62, 63 enter the respective grooves is used to manage the wear date of the brake pad 70. Also good.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to the accompanying drawings.
In the second embodiment of the present invention, a detector is provided in the configuration of the brake device for an elevator drive machine according to the first embodiment.

As shown in FIG. 6, first and second detection switches 97 and 98 are provided on the bottom surface 27. The first and second detection switches 97 and 98 are electrically connected to an elevator control device (not shown) and constitute a movement sensor. The first detection switch 97 and the second detection switch 98 are provided outside the guide 90 and include

arm portions

97a and 98a. The

arm portions

97a and 98a are connected to the first detection switch 97 and the second detection switch 98 by

hinges

97b and 98b. Further, the

arm portions

97a, 98a are provided with

wheel portions

97c, 98c at the tips, and the

wheel portions

97c, 98c are pressed against and contact the first pin 62 and the second pin 63. The

wheel portions

97c and 98c have a length parallel to the longitudinal direction of the rod 60 so that the

wheel portions

97c and 98c come into contact with each other even if the first pin 62 and the second pin 63 slide. Other configurations are the same as those of the first embodiment.

Next, the operation of the second embodiment will be described. When the rod 60 is rotated as in the first embodiment, the first and

second pins

62 and 63 are also adjacent to the second to fourth grooves 92b to 92d and the second to fourth grooves 92f to 92h.

Wheel portions

97c and 98c pressed against the first and

second pins

62 and 63 are provided to move via the first to third communication grooves 93a to 93c and the first to third communication grooves 93d to 93f. The angle of the

arm portions

97a and 98a being changed changes. The first to the second to fourth grooves 92b to 92d and the second to fourth grooves 92f to 92h adjacent to the first and

second pins

62 and 63 detected by the change in angle of the

arm portions

97a and 98a. The first and second detection switches 97 and 98 detect the movement through the third communication grooves 93a to 93c and the first to third communication grooves 93d to 93f, and output them to an elevator control device (not shown). The maintenance person can check the rotation state of the rod 60 without directly observing.

As described above, the first and second detection switches 97 and 98 are provided, and the first and second detection switches 97 and 98 detect the movement of the first and

second pins

62 and 63, whereby the first and second detection switches 97 and 98 are detected. Since the first and second detection switches 97 and 98 for detecting the movement of the

pins

62 and 63 to the adjacent second to fourth grooves 92b to 92d and the second to fourth grooves 92f to 92h are provided, the rod 60 The maintenance person can check the rotation state of the brake pad 70 without directly observing it, and the wear of the brake pad 70 can be easily managed.

In the second embodiment, the

wheel portions

97c and 98c as the movement sensors are pressed against the first and

second pins

62 and 63 to detect an angular change of the first and

second pins

62 and 63. The first and second detection switches 97 and 98 are provided, but the mode of the movement sensor is not limited to this. For example, you may provide the movement sensor which detects the angle change of the 1st, 2nd pins 62 and 63 by non-contacts, such as a well-known photosensor.

In the first and second embodiments, the first to fourth grooves 92a to 92d and the first to fourth grooves 92e to 92h, the first to third communication grooves 93a to 93, and the first to third grooves Although the third connecting grooves 93d to 93g are provided, the number of grooves and connecting grooves may be any number, and the rod 60 is rotated clockwise for each groove in accordance with wear of the brake pad 70. If possible, the shape of the groove and the connecting groove may be other shapes.

Further, a first screw portion 32 is provided on the inner side of the piston 30 and a second screw portion 61 is provided on the outer side of the rod 60 and is screwed to the first screw portion 32 so that the rod 60 is rotated clockwise. The brake pad 70 is configured to be close to the disk 80 by rotating, but the first screw portion 32 and the second screw portion 61 are so-called reverse screws, and the rod 60 rotates counterclockwise. Thus, the brake pad 70 may be close to the disk 80.

Moreover, although the 1st spring 50 and the 2nd spring 51 comprised the 1st biasing part, and the 1st pin spring 94 and the 2nd pin spring 95 comprised the 2nd biasing part, each biasing part was comprised. What constitutes is not limited to a spring, but may be an urging portion using another elastic body such as rubber.

10 brake device for elevator drive, 21 spring case part (fixed part), 30 piston (first movable part), 32 first screw part, 50 first spring (first biasing part), 51 second spring (second 1 biasing part), 60 rod (second movable part), 61 second screw part, 62 first pin, 63 second pin, 70 brake pad (braking piece), 80 disc (braking part), 90 guide, 92a first groove (groove), 92b second groove (groove), 92c third groove (groove), 92d fourth groove (groove), 92e first groove (groove), 92f second groove (groove), 92g second 3 groove (groove), 92h 4th groove (groove), 93a 1st communication groove (communication groove), 93b 2nd communication groove (communication groove), 93c 3rd communication groove (communication groove), 93d 1st communication groove ( Communication groove), 93e second communication groove (communication groove), 93f second Communication groove (communication groove), 94 1st pin spring (2nd urging part), 95 2nd pin spring (2nd urging part), 96 Position adjustment part, 97 1st detection switch (movement sensor), 98th 2 detection switch (movement sensor).

Claims

A fixed part;
A first movable part movable with respect to the fixed part;
A first urging portion that presses and moves the first movable portion so as to be separated from the fixed portion;
A second movable part connected to the first movable part and movable together with the first movable part;
A braking piece provided on the second movable part;
A portion to be braked against which the braking piece is pressed by the movement of the second movable portion;
A brake device for an elevator drive machine, comprising: a position adjusting unit that moves a position of the second movable part relative to the first movable part in a direction away from the fixed part when the thickness of the braking piece decreases.
The first movable part includes a first screw part,
The second movable part includes a second screw part,
The first screw part and the second screw part are screwed together, and the second movable part is rotatable with respect to the first movable part,
2. The brake device for an elevator drive machine according to claim 1, wherein the position adjusting unit moves the position of the second movable unit by rotating the second movable unit with respect to the first movable unit.
The position adjustment unit includes a guide provided in the fixed portion, a second urging portion provided in the guide, and a pin provided in the second movable portion,
The second urging portion is connected to the pin,
The guide has a plurality of grooves provided in the movement direction of the second movable part, and a communication groove that connects the adjacent grooves.
The pin is inserted into the groove,
When the second urging portion urges the pin, the second movable portion is urged in a direction rotating with respect to the first movable portion,
The pin slides in the groove according to the movement of the second movable part, and when the thickness of the braking piece decreases, the pin passes through the connecting groove by the urging by the second urging part. The elevator drive machine brake device according to claim 2, wherein the brake device moves to the adjacent groove.
The elevator drive machine brake device according to claim 3, further comprising a movement sensor that detects movement of the pin to the adjacent groove.