Hoist for elevator

Abstract

The utility model provides a traction machine for an elevator. The traction machine can reduce maintenance and inspection work time. The elevator hoist (20) is provided with: a sheave (21) on which a main rope is erected; a brake mechanism (32) including: a movable unit (42) including a liner (43) for applying a braking force to the sheave (21); and a biasing unit (52) having a main body (54) that houses a plunger (53) provided with a rod section (53A), the rod section (53A) being in contact with an adjustment bolt (46) attached to the movable unit (42), and when the main body (54) is in a power-on state, the contact surface of the rod section (53A) pressing the adjustment bolt (46) against the biasing force of the compression spring (45), displacing the movable unit (42) to a position where the braking force does not act, and pressing the adjustment bolt (46) against the biasing force of the compression spring (45) when the main body (54) is in a power-on state. The adjustment bolt (46) is provided with a cylindrical member (60) with a threaded hole, and the cylindrical member (60) with the threaded hole is screwed with the adjustment bolt (46) in a state of being displaceable in a direction of approaching or separating from the rod part (53A).

Description

Technical Field

[0001] The utility model relates to an elevator traction machine provided in an elevator for raising and lowering an elevator car through a main rope. Background Art

[0002] The elevator traction machine includes: a sheave and a brake mechanism, wherein the sheave frame is provided with a main rope for lifting and lowering the elevator car, and the brake mechanism applies a braking force to the sheave. The brake mechanism includes a movable unit and a force applying unit, wherein the movable unit uses a sliding member to apply a braking force to the sheave, and the force applying unit applies a force to the movable unit. The movable unit is always forced in a direction in which the braking force acts on the sheave, and when the braking force is released, the force applying unit applies a force to the movable unit in a direction opposite to the above-mentioned force, thereby releasing the braking state of the sheave.

[0003] The force applying unit includes a plunger with a rod installed and a main body composed of a coil or the like, and the rod is configured to protrude from the main body. When the main body is in a powered state, the plunger moves a predetermined distance by magnetic force, thereby the rod applies force to the movable unit, thereby achieving a state in which the braking force of the movable unit does not act on the sheave. On the other hand, in a non-powered state, the rod is pressed back by the force of the movable unit, thereby the plunger is pressed back to the predetermined distance, thereby achieving a state in which the braking force acts on the sheave.

[0004] Patent document 1 discloses a traction machine for an elevator, which includes a braking mechanism comprising: a lining (sliding member) and a lever portion on which the lining is installed, wherein the lining is pressed against a rotating body through the lever portion by the force of a first force-applying member, and an actuator (main body) including a movable iron core (plunger) is used to move the lever portion in a direction to separate the lining from the rotating body.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent No. 6674666 Utility Model Content

[0008] Issues to be Solved by Utility Models

[0009] However, in order to confirm that the plunger is properly driven during maintenance and inspection, it is necessary to measure the length of the rod portion extending from the main body when the power is not supplied. However, since the rod portion is always urged by the movable unit, it is difficult to measure the length of the rod portion extending from the main body, and maintenance and inspection work requires time and effort.

[0010] The utility model aims to provide an elevator traction machine capable of reducing the time of maintenance and inspection operations.

[0011] Means for solving problems

[0012] The utility model discloses a traction machine for an elevator, comprising: a rope wheel, on which a main rope for an elevator is installed; a braking mechanism, comprising: a movable unit, the movable unit having a sliding member and a force member, the sliding member causes a braking force to act on the rope wheel, and the force member applies force in a direction in which the sliding member presses the rope wheel; the force unit has a main body, the main body accommodates a plunger provided with a rod, and the rod abuts against a bolt installed on the movable unit; when the main body is in an energized state, the rod overcomes the force of the force member and presses the bolt, so that the movable unit is shifted to a position where the braking force does not work; a cylindrical member is provided on the bolt, and the cylindrical member is screwed with the bolt in a state in which it can be shifted in a direction close to or away from the rod.

[0013] In the elevator hoisting machine of the present invention, the cylindrical member may be provided with an opening for visually confirming the position of the rod.

[0014] In the elevator hoisting machine of the present invention, the cylindrical member may be provided with a measurement reference surface, and the measurement reference surface is parallel to a main body side reference surface provided on the main body when the cylindrical member abuts against or approaches the rod portion.

[0015] In the elevator hoisting machine of the present invention, the tubular member may be configured such that the bolt is displaced to a position where the braking force does not act by applying force in a direction away from the main body through a brake release lever inserted between the tubular member and the main body.

[0016] Effect of utility model

[0017] According to the elevator traction machine of the utility model, the cylindrical member is screwed with the bolt in a state that it can be displaced in the direction of approaching or leaving the rod. Therefore, the length from the main body to the cylindrical member can be measured in a state where the cylindrical member is abutted or close to the rod. Here, the length of the cylindrical member part included in the length from the main body to the cylindrical member is a constant size. Therefore, by subtracting the length of the cylindrical member part from the length from the main body to the cylindrical member, the length of the rod protruding from the main body can be confirmed. Thus, the effort required to measure the length of the rod protruding from the main body can be reduced. As a result, the effort of maintenance and inspection operations can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a diagram showing a schematic structure of an elevator in this embodiment.

[0019] Figure 2 (a) in the equation is Figure 1 The overall structure of the traction machine included in the figure, and partly includes a partial enlarged view of the structure inside the force application unit in the brake mechanism, Figure 2(b) is a diagram showing the structure of the hoisting machine in a top view.

[0020] Figure 3 (a) is a cross-sectional view showing the structure inside the force applying unit in the demagnetized state. Figure 3 (b) is a cross-sectional view showing the internal structure of the force applying unit in the excited state.

[0021] Figure 4 (a) is a diagram showing the installation position of the cylindrical member with threaded holes relative to the adjustment bolt when not in use. Figure 4 (b) is a diagram showing the position of the cylindrical member with threaded holes during use, i.e., during maintenance and inspection. Figure 4 (c) in Figure 4 A partially enlarged view of the cylindrical component with a threaded hole included in (b).

[0022] Figure 5 (a) is a diagram showing the structure of a cylindrical member with a threaded hole from a side view. Figure 5 (b) is a diagram showing the structure of the cylindrical member with a threaded hole in a top (planar) view.

[0023] Figure 6 (a) is a top view of the brake release lever. Figure 6 (b) is a side view of the brake release lever.

[0024] Figure 7 It is a top view showing a state where the brake release lever is attached to the hoisting machine.

[0025] Explanation of symbols

[0026] 10: Elevator;

[0027] 11: Well;

[0028] 14: Main rope;

[0029] 15: Elevator car;

[0030] 20: Traction machine (traction machine for elevator);

[0031] 30, 32: brake mechanism;

[0032] 40: adjusting bolt;

[0033] 42: movable unit;

[0034] 43: Lining (sliding member);

[0035] 44: brake lever;

[0036] 45: compression spring (force applying member);

[0037] 46: adjusting bolt;

[0038] 52: force application unit;

[0039] 53: plunger;

[0040] 53A: Rod;

[0041] 53B: Washer;

[0042] 53C: compression spring;

[0043] 54: main body (main body);

[0044] 55: Electromagnetic part;

[0045] 56: hood;

[0046] 56S: outer surface (main body side reference surface);

[0047] 60: cylindrical member with threaded hole;

[0048] 60R: right side end surface (measurement reference surface);

[0049] 62: cover;

[0050] 62A, 62B: opening;

[0051] 62F: Bottom;

[0052] 70, 72: brake release lever;

[0053] SP: gap;

[0054] P1: Braking position;

[0055] P2: non-braking position;

[0056] X, Y: horizontal direction;

[0057] Z: vertical direction. DETAILED DESCRIPTION

[0058] Hereinafter, an elevator 10 according to an embodiment of the present invention will be described with reference to the accompanying drawings. In addition, in each figure, the dimensions of the components are not necessarily uniform. In each figure, the horizontal direction perpendicular to the axial direction of the sheave 21 is represented as the horizontal direction X, the horizontal direction perpendicular to the horizontal direction X is represented as the horizontal direction Y, and the vertical direction is represented as the vertical direction Z.

[0059] Figure 1 1 is a schematic diagram showing the overall structure of the elevator 10. Figure 1As shown, the elevator 10 is a rope-type elevator using a traction method as a driving method, and a machine room 12 is provided just above a hoistway 11. The elevator 10 is provided with a traction machine (elevator traction machine) 20 and a deflection wheel 13 in the machine room 12, and a main rope 14 is wound around a sheave 21 of the traction machine 20 and the deflection wheel 13, and an elevator car 15 is suspended from one end of the main rope 14, and a counterweight 16 is suspended from the other end.

[0060] Figure 2 (a) shows the structure of the front side of the hoisting machine 20 and partially includes a partial enlarged view showing the internal structure of the force applying unit 52. Figure 2 (b) is a top view showing the structure of the traction machine 20. Figure 2 (a) and Figure 2 In (b), in order to avoid complicated illustration, some structures are omitted and the cross-sectional hatching is omitted for representation. Figure 2 (a) and Figure 2 As shown in (b) in FIG. 2 , in addition to the sheave 21, the hoisting machine 20 also includes a rotating body 22 coaxially mounted with the sheave 21 and a pair of left and right brake mechanisms 30, 32 for applying a braking force to the rotating body 22. Here, since the brake mechanisms 30, 32 have the same structure, the right brake mechanism 32 will be mainly described in the following description, and the description of the left brake mechanism 30 will be appropriately omitted. The brake mechanism 32 includes a movable unit 42 and a force applying unit 52 for applying a force to the movable unit 42.

[0061] The movable unit 42 includes: a lining (sliding member) 43, a brake lever 44, a compression spring (biasing member) 45, and an adjustment bolt 46. The lining 43 causes a braking force to act on the rotating body 22. The brake lever 44 rotatably supports the lining 43. The compression spring 45 urges the brake lever 44 in a direction approaching the rotating body 22. The adjustment bolt 46 abuts against a rod portion 53A of a biasing unit 52 described later. The lower end portion of the brake lever 44 is axially supported by a rotating shaft 44B, and the brake lever 44 is biased by a compression spring 45 installed on the upper portion and rotates in a direction to press the lining 43 against the rotating body 22. The rotating body 22 is mounted on the rotating shaft of the sheave 21 provided on the front side, and the braking force acts on the rotating body 22, so that the braking force also acts on the sheave 21.

[0062] The adjustment bolt 46 penetrates the upper end portion 44A of the brake lever 44 in the horizontal direction X, and is fixed to the upper end portion 44A using a nut NT1 in a state of being screwed into a threaded hole provided in the upper end portion 44A.

[0063] The force applying unit 52 includes a plunger 53 and a main body (main body) 54. The plunger 53 is a movable iron core and is provided with a rod 53A for applying force to the adjustment bolt 46. The main body 54 accommodates the plunger 53. The main body 54 includes a cover 56, which blocks the electromagnetic part 55 surrounding the plunger 53 and the end opening of the main body 54. The outer surface 56S of the cover 56 (see Figure 4 (b)) in FIG. 5 corresponds to the main body side reference surface of the present invention. The plunger 53 is provided with a rod portion 53A. The rod portion 53A protrudes to the outside from a through hole 56H provided in the cover portion 56.

[0064] The electromagnetic part 55 is composed of a coil or the like, and has the function of moving the plunger 53 toward the cover part 56 side by magnetic force when power is supplied. The cover part 56 is made of a ferromagnetic metal such as iron, and has the function of attracting the plunger 53 by magnetic force when the electromagnetic part 55 is in a power-on (excitation) state. In addition, a compression spring 53C is installed between the washer 53B installed at the end of the rod part 53A and the cover part 56. The end surface T (refer to Figure 3 (a) shows a state where the adjustment bolt 46 of the movable unit 42 abuts against the adjustment bolt 46 of the movable unit 42 .

[0065] Further references Figure 3 (a) and Figure 3 In (b), the operation of the brake mechanism 32 is described. Figure 3 (a) is a cross-sectional view showing the structure inside the force applying unit 52 in the brake mechanism 32 at the brake position P1. Figure 3 (b) is a cross-sectional view showing the structure inside the force applying unit 52 at the non-braking position P2. Figure 3 (a) and Figure 3 In (b), in order to avoid complicated illustration, some cross-section hatching is omitted for representation. Figure 3 As shown in (a) in the figure, when the electromagnetic part 55 is in a non-energized state, the force of the adjustment bolt 46 of the movable unit 42 is greater than the elastic force of the compression spring 53C that urges the plunger 53 toward the cover part 56, so the plunger 53 of the force-applying unit 52 moves in a direction away from the cover part 56 and is held in the braking position P1. At this time, a magnetic gap (clearance) GP is formed between the cover part 56 and the plunger 53.

[0066] On the other hand, Figure 3As shown in (b), when the electromagnetic part 55 is in the energized (excited) state, the plunger 53 overcomes the force of the adjustment bolt 46 and is pulled toward the cover part 56 by the magnetic force, thereby moving to the non-braking position P2 on the cover part 56 side. In addition, since a buffer member not shown is arranged between the cover part 56 and the plunger 53, the moving distance of the plunger 53 when the electromagnetic part 55 changes from the non-energized state to the energized state is slightly shorter than the above-mentioned magnetic gap GP. In this way, the adjustment bolt 46 is displaced outwardly, in other words, in the direction away from the cover part 56, through the plunger 53, and the movable unit 42 rotates in the direction away from the rotating body 22, thereby becoming a state in which the liner 43 is away from the rotating body 22 and the braking force does not act on the rotating body 22.

[0067] Here, in order to operate the plunger 53 normally, the size of the magnetic gap GP formed when the electromagnetic part 55 is in a non-energized state needs to be a predetermined size. However, the size of the magnetic gap GP, which is the gap between the plunger 53 and the cover part 56 , cannot be directly measured.

[0068] Therefore, during maintenance inspection, the following operation is performed: the length of the rod 53A protruding from the cover 56 is measured when the electromagnetic part 55 is in a non-energized state, for example, by comparing it with the length of the rod 53A protruding from the cover 56 when it is energized, to confirm the size of the above-mentioned magnetic gap GP.

[0069] However, since the rod 53A contacts the adjustment bolt 46 , it is difficult to measure the length from the end surface T of the rod 53A to the cover 56 using a measuring instrument such as a vernier caliper, and there is a problem that the measurement requires time and effort.

[0070] Therefore, in this embodiment, by using the threaded cylindrical member 60 mounted on the adjustment bolt 46, the length of the rod portion 53A protruding from the cover portion 56 is measured to confirm that the size of the magnetic gap GP is an appropriate size. Figure 4 (a)~ Figure 5 (b) of FIG. 1 illustrates a measurement method using the threaded cylindrical member 60 .

[0071] Figure 4 (a) is a diagram showing the installation position of the threaded hole cylindrical member 60 relative to the adjustment bolt 46 when not in use. Figure 4 As shown in (a) of FIG. 1 , the cylindrical member 60 with a threaded hole is screwed with the adjustment bolt 46 in a state that it can be displaced in a direction close to or away from the rod portion 53A. In addition, the cylindrical member 60 with a threaded hole is installed in a retracted position, wherein the retracted position is a position adjacent to the upper end portion 44A of the brake lever 44 away from the rod portion 53A when not in use (not undergoing maintenance inspection).

[0072] on the other hand, Figure 4(b) is a diagram showing the position of the threaded hole cylindrical member 60 during maintenance inspection. Figure 4 (c) in Figure 4 A partial enlarged view of the cylindrical member 60 with threaded holes included in (b). Figure 4 (b) and Figure 4 As shown in (c), when performing maintenance and inspection work, the threaded cylindrical member 60 is displaced from the above-mentioned escape position toward the cover portion 56 to a position where the bottom surface 62F of the cover portion 62 and the rod portion 53A abut or approach each other as described in detail later.

[0073] Here, Figure 5 (a) is a diagram showing the structure of a cylindrical member with a threaded hole from a side view. Figure 5 (b) is a diagram showing the structure of a cylindrical member with a threaded hole from a top view (in other words, from a plan view). Figure 5 (a) and Figure 5 As shown in (b) of FIG. 1 , the threaded cylindrical member 60 is provided with a bottomed cylindrical cover 62 on the left side thereof, and a threaded hole 64 is provided penetrating from the right end surface 60Q to the axial center of the bottom surface 62F of the cover 62 .

[0074] The inner space D of the cover 62 is formed to a size that allows the rod 53A to be inserted, in other words, to be formed to a substantially cylindrical shape that allows the rod 53A to be covered. In addition, openings 62A and 62B are provided on the side of the cover 62. Thus, the inner space D of the cover 62 can be visually confirmed from the outside.

[0075] However, if the end surface T of the rod portion 53A (see Figure 3 If the adjusting bolt 46 is separated by the force of the bottom surface 62F of the internal space D of the cover portion 62, the protruding length of the rod portion 53A from the cover portion 56 of the main body 54 cannot be accurately measured.

[0076] Therefore, if Figure 4 As shown in (c) in FIG. 1 , the end surface T of the rod portion 53A is visually confirmed through the openings 62A and 62B (see FIG. 1 ). Figure 3 (a)) is only slightly in contact with the bottom surface 62F (in other words, the bottom surface 62F is in contact to such an extent that the rod portion 53A is not over-pressed), or the end surface T and the bottom surface 62F are close to each other to such an extent that there is an extremely small gap. Here, the extremely small gap refers to a gap of, for example, less than 0.02 mm. Moreover, the size of the extremely small gap can also be confirmed by inserting a gap gauge through the openings 62A and 62B. Thereafter, the distance L from the right side end surface (measurement reference surface) 60R of the threaded cylindrical member 60 to the outer side surface 56S of the cover portion 56 is measured (refer to Figure 4(b)), wherein the right end surface 60R is the right end surface 60R of the cylindrical member 60 which is substantially parallel to the outer surface 56S of the cover portion 56 and is located on the opposite side of the cover portion 56.

[0077] Thus, it is possible to confirm whether it is in a normal state, that is, when the electromagnetic part 55 changes from the non-energized state to the energized state, the plunger 53 moves to the non-braking position P2, so that the braking force no longer acts on the rotating body 22 via the movable unit 42. In addition, when the distance L is not within the preset allowable value, for example, by adjusting the fixing position of the adjustment bolt 46 relative to the brake lever 44 of the movable unit 42, the protruding length of the rod part 53A is adjusted.

[0078] According to the hoisting machine 20 of the present embodiment, the threaded hole cylindrical member 60 is displaced toward the cover portion 56 to a position where the bottom surface 62F of the cover portion 62 abuts against or is close to the rod portion 53A, and the distance L from the cover portion 56 to the threaded hole cylindrical member 60 is measured. Here, the length (thickness) TL of the threaded hole cylindrical member 60 included in the distance L (see Figure 4 (c)) in the figure is a constant length, in other words, a fixed value, and therefore, by subtracting the length corresponding to the fixed value, the length of the rod 53A protruding from the cover 56 can be confirmed. Here, the length TL corresponds to the distance between the right end surface 60R and the bottom surface 62F of the cylindrical member with a threaded hole 60. Thus, the time required to measure the length of the rod 53A protruding from the cover 56 can be reduced. As a result, the time required for maintenance and inspection operations can be reduced.

[0079] Next, a method for releasing the brakes of the hoisting machine 20 using the threaded hole cylindrical member 60 in the case of a power outage or the like will be described. In the above-mentioned hoisting machine 20, since the electromagnetic part 55 is in a non-energized state in the case of a power outage or the like, the braking force is applied to the rotating body 22 via the brake mechanisms 30 and 32. In this case, it is necessary for the maintenance personnel to manually temporarily release the braking state of the brake mechanisms 30 and 32, and to raise or lower the elevator car 15 to a predetermined entrance.

[0080] Therefore, in the present embodiment, the braking state of the brake mechanisms 30 , 32 is released using the threaded cylindrical member 60 and brake release levers 70 , 72 described later.

[0081] Figure 6 (a) is a top view of the brake release lever 72. Figure 6 (b) is a side view of the brake release lever 72. Figure 6 (a) and Figure 6As shown in (b) of FIG. 1 , the brake release lever 72 is a metal jig composed of a lever body 74 in the shape of a long rod and an insertion portion 76 installed at the end portion of the lever body 74. One end side of the insertion portion 76 is welded and fixed to the lever body 74, and the other end side is bent and extended to form a claw portion 78. The claw portion 78 is formed into a two-pronged flat plate in a manner that clamps the rod portion 53A.

[0082] like Figure 7 As shown in FIG. 1 , a bulge 78A is provided on the back side of the insertion portion 76. The bulge 78A is substantially semicircular in side view and is provided in a straight line in the width direction. When the threaded cylindrical member 60 is moved toward the cover portion 56, the bulge 78A is inserted into the gap SP (see FIG. 1 ) formed between the cover portion 56 and the threaded cylindrical member 60 in such a manner that the bulge 78A contacts the cover portion 56. Figure 7 ) and when force is applied to the lever body 74 toward the center of the rope pulley 21, the bulging portion 78A acts as a fulcrum.

[0083] In addition, preferably, the length of the gap SP is set to be slightly longer than the thickness of the claw portion 78 including the bulging portion 78A in order to insert the claw portion 78. Therefore, preferably, the size of the gap SP is adjusted in advance by rotating the threaded cylindrical member 60 relative to the adjustment bolt 46 to move from the escape position toward the cover portion 56.

[0084] Furthermore, when a force is applied to the threaded cylindrical member 60, the distance α between the tip 78P of the claw 78, which acts as a point of action, and the bulging portion 78A is preferably set to a length such that the tip 78P is located on the inner side of the axial center line CL of the adjustment bolt 46 when the claw 78 is inserted between the threaded cylindrical member 60 and the cover 56. More specifically, it is preferred that the distance between the tip 78P and the axial center line CL is set to a length within 15% of the distance between the bulging portion 78A and the axial center line CL. Thus, the force of the brake release lever 70 can be smoothly transmitted to the adjustment bolt 46 via the threaded cylindrical member 60.

[0085] Figure 7 2 is a top view showing a state where the brake release lever 72 is installed in the traction machine 20. Figure 7 As shown, when the electromagnetic part is in a non-energized state due to a power outage or the like, the threaded cylindrical member 60 is displaced from the avoidance position toward the direction close to the cover part 56. At this time, preferably, the threaded cylindrical member 60 is displaced toward the cover part 56 until the size of the gap SP between the threaded cylindrical member 60 and the cover part 56 is slightly larger than the thickness of the claw part 78 of the brake release lever 72.

[0086] Next, the brake release lever 72 is inserted into the gap SP, and the lever body 74 is forced toward the center of the sheave 21, thereby forcing the threaded cylindrical member 60 toward the movable unit 42 side, that is, away from the main body 54. As a result, the brake lever 44 (see FIG. 1 ) can be released by the threaded cylindrical member 60. Figure 2 (a)) in the figure is rotated in a direction away from the rotating body 22, so that the braking force does not act on the rotating body 22 through the lining 43.

[0087] In the same order as the above-mentioned brake mechanism 32, the brake release lever 70 having the same structure as the brake release lever 72 is also used in the brake mechanism 30 on the opposite side to release the brake state simultaneously with the brake mechanism 32, for example, within a few seconds. In this way, the brake state of the rotating body 22 can be temporarily released, and the elevator car 15 can be lowered to the desired entrance. In this way, by using the brake release levers 70 and 72, the brake state of the brake mechanisms 30 and 32 can be released by a single maintenance worker.

[0088] In addition, in the present embodiment, the magnitude of the braking force acting on the rotating body 22 via the brake mechanisms 30 and 32 is preferably set to a magnitude that can stop the rotating body 22 using only the braking force of any one of the brake mechanisms 30 and 32. In this case, during maintenance and inspection, after temporarily releasing the braking state of the brake mechanism 30 using the brake release lever 70 and performing an inspection of the working state, the brake mechanism 30 can be returned to the braking state, and then the brake release lever 72 can be used to temporarily release the braking state of the brake mechanism 32 and perform an inspection. Therefore, the working states of the brake mechanisms 30 and 32 can be checked respectively while the rotating body 22 is kept stopped. As a result, the operability of the maintenance and inspection work can be improved.

[0089] In this embodiment, the hoisting machine 20 is described as having two brake mechanisms 30 and 32, but the present invention is not limited thereto. For example, the hoisting machine 20 may have only one brake mechanism. In this case, the same effects as those of the above embodiment can be obtained.

[0090] The utility model can be implemented in the manner of adding various improvements, modifications or deformations according to the knowledge of those skilled in the art without departing from its purpose. In addition, it can also be implemented in the manner of replacing any technical feature with other technologies within the scope of producing the same action or effect.

Claims

1. An elevator traction machine, characterized in that: have: The rope sheave is equipped with the main rope for the elevator; Braking mechanism, comprising: a movable unit having a sliding member and a biasing member, wherein the sliding member applies a braking force to the sheave, and the biasing member applies a force in a direction in which the sliding member presses the sheave; The force applying unit comprises a main body, wherein the main body accommodates a plunger provided with a rod, wherein the rod abuts against a bolt installed on the movable unit; when the main body is in an energized state, the rod overcomes the force of the force applying member and presses the bolt, so that the movable unit is displaced to a position where the braking force does not work; The bolt is provided with a cylindrical member, and the cylindrical member is screwed to the bolt in a state where the cylindrical member can be displaced in a direction approaching or separating from the rod portion.

2. The elevator traction machine according to claim 1, characterized in that: The cylindrical member is provided with an opening for visually confirming the position of the rod.

3. The elevator traction machine according to claim 1, characterized in that: The cylindrical member is provided with a measurement reference surface, and the measurement reference surface is parallel to a main body side reference surface provided on the main body when the cylindrical member abuts against or approaches the rod portion.

4. The elevator traction machine according to claim 1, characterized in that: The cylindrical member is configured so that the bolt is displaced to a position where the braking force does not act by being urged in a direction away from the main body by a brake release lever inserted between the cylindrical member and the main body.

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