DE112021007859T5 - One-side opening type door device for elevators - Google Patents

Abstract

In a side-opening type door device for an elevator, a belt gripper is attached to a toothed belt. A door main body is connected to the toothed belt through the intermediary of the belt gripper, and performs a door opening/closing operation by movement of the toothed belt caused by rotation of a first pulley and a second pulley. A mass body is attached to the toothed belt and is moved together with the toothed belt. Further, the mass body is mounted on the toothed belt at such a position that it is moved in a direction opposite to a movement direction of the belt gripper at the time of opening and closing operation of the door main body.

Description

Technical area

The present disclosure relates to a side opening type door device for an elevator.

Background of the invention

In a related art car door opening and closing device, an endless transmission rope body is wound around a pair of pulleys. A car door is connected to the transmission rope body. For example, a toothed belt is used as the transmission rope body (see, for example, Patent Literature 1).

Citation list

Patent literature

[PTL1] JP 2008-168957 A

Summary of the invention

Technical task

In the cabin opening and closing device described above, while a cabin door performs an opening and closing operation at a constant speed, the vibration of the timing belt cord may resonate with the excitation vibration caused by the engagement between the timing belt and the pair of pulleys, which may generate noise.

This disclosure has been made to solve the problem described above, and has an object to provide a side-opening type door device for an elevator capable of suppressing the vibration of a toothed belt.

Solution to the task

According to this disclosure, there is provided a side-opening type door device (a side-opening type door device) for an elevator, which includes a first pulley; a second pulley arranged to be spaced apart from the first pulley; a toothed belt wound around the first pulley and the second pulley and having a plurality of belt teeth; a belt gripper attached to the toothed belt; a door main body connected to the toothed belt through the intermediary of the belt gripper and configured to perform an opening/closing operation (opening and closing operation) by movement of the toothed belt caused by rotation of the first pulley and the second pulley; and a mass body attached to the toothed belt and configured to be moved together with the toothed belt. The mass body is attached to the toothed belt at such a position as to be moved in a direction opposite to a movement direction of the belt gripper at a time of opening/closing operation of the door main body.

Advantageous effects of the invention

According to the side opening type door device for an elevator of this disclosure, it is possible to suppress swinging of the toothed belt.

Short description of the drawings

• 1 is a schematic configuration view illustrating an elevator according to a first embodiment.
• 2 is a front view of a cabin door device from 1 , seen from a stop.
• 3 is a front view showing the cabin door device of 2 in the fully opened state.
• 4 is a model diagram illustrating an upper section of a timing belt of 2 .
• 5 is a model diagram to illustrate the equilibrium of forces on three point masses from 4 .
• 6 is a model diagram illustrating a model of the upper section of the timing belt of 2 when one of the fixed ends is subjected to a displacement excitation.
• 7 is a diagram showing the temporal change of the displacement of the five point masses from 6 .
• 8th is a graph showing, for example, a relationship between door opening/closing time, door speed, and motor torque.
• 9 is a side view showing a mass body made of 2 .
• 10 is a sectional view along the line XX of 9 .
• 11 is a side view showing a first modification example of the mass body of 2 .
• 12 is a sectional view along the line XII-XII of 11 .
• 13 is a side view illustrating a second modification example of the mass body of 2 .
• 14 is a sectional view along the line XIV-XIV of 13 .
• 15 is a side view illustrating a third modification example of the mass body of 2 .
• 16 is a sectional view along the line XVI-XVI of 15 .
• 17 is a side view illustrating an example in which the mass body is attached to a timing belt with a joint.
• 18 is a side view illustrating a relevant portion of a toothed belt according to a second embodiment.

Description of the embodiments

Embodiments will be described below with reference to the drawings.

First embodiment

1 is a schematic configuration view illustrating an elevator according to a first embodiment. In 1 A machine room 2 is provided in an upper section of an elevator shaft 1. A hoisting machine 3, a deflection pulley 4 and an elevator control device 5 are installed in the machine room 2.

The hoist 3 includes a traction sheave 6, a hoist motor (not shown) and a hoist brake (not shown). The hoist motor drives the traction sheave 6. The hoist brake keeps the traction sheave 6 in a stationary state. In addition, the hoist brake brakes the rotation of the traction sheave 6.

Suspension bodies 7 are wound around the traction sheave 6 and the deflection sheave 4. A plurality of ropes or a plurality of belts are used as suspension bodies 7. A cabin 8 is connected to a first end section of the suspension bodies 7. A counterweight 9 is connected to a second end section of the suspension bodies 7.

The cabin 8 and the counterweight 9 are suspended on the suspension bodies 7 and are moved vertically in the elevator shaft 1 by rotation of the traction sheave 6. The elevator control device 5 controls the hoisting machine 3 to control a travel path of the cabin 8.

A pair of car guide rails (not shown) and a pair of counterweight guide rails (not shown) are installed in the elevator shaft 1. The pair of car guide rails guide the vertical movement of the car 8. The pair of counterweight guide rails guide the vertical movement of the counterweight 9.

The cabin 8 comprises a cabin frame 10 and a car 11. The suspension bodies 7 are connected to the cabin frame 10. The cabin 11 is supported by the cabin frame 10. A device for a cabin door 12 is provided on the cabin 11. The cabin door device 12 opens and closes a cabin door.

A door control unit 13 is provided on the top of the cabin 8.

Landing door devices 14 are provided at the landings of a plurality of floors. Each of the landing door devices 14 opens and closes one of the associated landing doors. When the car 8 has landed, each of the outer door devices operates in conjunction with the car door device 12.

2 is a front view of the cabin door device 12 from 1 viewed from the landing side to show the cabin door device 12 in a fully closed state. 3 is a front view of the cabin door device 12 of 2 in a fully opened state. The car door device 12 according to the first embodiment is a side opening type door device.

The car door device 12 includes the door control unit 13, a door bracket 21, a door motor 22, a first pulley 23, a second pulley 24, an endless formed toothed belt 25, a first door main body 26, a second door main body 27, a belt gripper 28, a link mechanism (not shown), and a mass body 29.

The door bracket 21 is fixed to an upper portion of the cage 11. A door rail 21a is formed on the door bracket 21.

The door motor 22 is attached to the door support 21. The first pulley 23 is attached to a rotary shaft of the door motor 22 and is rotated by the door motor 22. A rotation center of the first pulley 23 is parallel to a depth direction of the cabin 8 and extends horizontally. The depth direction of the cabin 8 is a direction parallel to a Y-axis of 2 .

The second pulley 24 is provided on the door bracket 21. Further, the second pulley 24 is arranged to be spaced apart from the first pulley 23 in a direction of opening and closing operations of the first door main body 26 and the second door main body 27. The direction of opening and closing operations of the first door main body 26 and the second door main body 27 is a direction parallel to a width direction of the cabin 8 and parallel to an X-axis of 2 is.

Further, a rotation center of the second pulley 24 is parallel to the rotation center of the first pulley 23. Further, the first pulley 23 and the second pulley 24 are arranged at the same position in a height direction of the cabin 8. The height direction of the cabin 8 is a vertical direction and a direction parallel to a Z axis of 2 .

The timing belt 25 is wound around the first pulley 23 and the second pulley 24. In addition, the timing belt 25 is moved to rotate by the rotation of the first pulley 23 and the second pulley 24. As shown in 9 As shown, the toothed belt 25 has a plurality of belt teeth 25a. A plurality of belt teeth (not shown) are formed on the first pulley 23 and the second pulley 24, respectively.

When the first door main body 26 is in a fully closed position, it is located closer to a door stop side than the second door main body 27. Specifically, when the second door main body 27 is in a fully closed position, it is located closer to a door pocket side than the first door main body 26.

At the time of opening and closing operation, the first door main body 26 is moved at a higher speed than the speed at which the second door main body 27 is moved. Specifically, the first door main body 26 is a high-speed door. At the time of opening and closing operation, the second door main body 27 is moved at a lower speed than the first door main body 26. Specifically, the second door main body 27 is a low-speed door.

The first door main body 26 includes a first door panel 31 and a first door hanger 32. The first door hanger 32 is attached to an upper surface of the first door panel 31.

The second door main body 27 includes a second door panel 33 and a second door hanger 34. The second door hanger 34 is attached to an upper surface of the second door panel 33.

A plurality of door rollers (not shown) are provided on each of the first door hangers 32 and the second door hanger 34. At the time of opening and closing operations of the first door main body 26 and the second door main body 27, the plurality of door rollers are moved while rolling on the door rail 21a.

The first door main body 26 and the second door main body 27 are suspended on the door rail 21a. Further, at the time of opening and closing operations, the first door main body 26 and the second door main body 27 are guided by the door rail 21a to be moved in the width direction of the cabin 8. Specifically, the direction of opening and closing operations of the first door main body 26 and the second door main body 27 is a direction parallel to the X-axis of 2 .

The belt gripper 28 is attached to either an upper portion or a lower portion of the timing belt 25. In the first embodiment, the belt gripper 28 is attached to the lower portion of the timing belt 25.

The lower portion of the timing belt 25 is a portion located below the first pulley 23 and the second pulley 24 when the first door main body 26 is in the fully closed position. The upper portion of the timing belt 25 is a portion located above the first pulley 23 and the second pulley 24 when the first door main body 26 is in the fully closed position.

Further, the belt gripper 28 is fixed to the first door hanger 32. The first door main body 26 is connected to the timing belt 25 through the mediation of the belt gripper 28. As a result, the first door main body 26 performs the opening/closing operation by the movement of the timing belt 25 caused by the rotation of the first pulley 23 and the second pulley 24. The door motor 22 generates a driving force to cause the first door main body 26 to perform the opening/closing operation.

The opening and closing operation of the first door main body 26 is transmitted to the second door main body 27 by means of the connecting mechanism. Thus, the second door main body 27 performs the opening and closing operation in conjunction with the first door main body 26.

The door control unit 13 controls the door motor 22 to thereby control the opening and closing operation of the first door main body 26. Further, the door control unit 13 maintains a constant maximum speed for 0.5 second or more during the opening and closing operation of the first door main body 26.

The mass body 29 is mounted on the timing belt 25 at such a position that it is moved in a direction opposite to the moving direction of the belt gripper 28 at the time of opening and closing operation of the first door main body 26. Specifically, the mass body 29 is mounted on the other of the upper and lower portions of the timing belt 25. In the first embodiment, the mass body 29 is fixed to the upper portion of the timing belt 25. The mass body 29 is moved together with the timing belt 25.

Furthermore, the mass body 29 is mounted on the timing belt 25 at such a position that it does not collide with the first pulley 23 and the second pulley 24 during the opening and closing operations of the first door main body 26 and the second door main body 27.

When the first door main body 26 is in the fully closed position, the belt gripper 28 is located closer to the first pulley 23 than at an intermediate position between the first pulley 23 and the second pulley 24. When the first door main body 26 is in the fully closed position, the mass body 29 is located closer to the second pulley 24 than at the intermediate position between the first pulley 23 and the second pulley 24.

A mass of the mass body 29 is 10% or less of a mass of the first door main body 26. Further, the mass of the mass body 29 is 20% or more and 100% or less of a mass of the timing belt 25 per meter.

Next, an effect of the mass body 29 is described. 4 is a model diagram illustrating the upper portion of the timing belt 25 of 2 . In 4 A right fixed end belongs to the first pulley 23. Furthermore, a left fixed end belongs to the second pulley 24.

It is assumed that a plurality of point masses are arranged at certain intervals on the upper portion with a length L. Among them, m _i represents a mass of an i-th point mass, m _i-1 represents a mass of an (i-1)-th point mass, m _i+1 represents a mass of an (i+1)-th point mass, and y _i represents a displacement amount of the i-th point mass in the vertical direction.

5 is a model diagram to illustrate the balance of forces on the three point masses of 4 . In 5 Δx represents a distance between the adjacent point masses. When the number of divisions of the model is N, Δx is L/N, where N is a natural number. Further, "y" represents a displacement amount of each of the point masses in the vertical direction, T represents a force in the horizontal direction acting on each of the point masses, that is, the tension of the timing belt 25, and F represents an external force in the vertical direction acting on each of the point masses.

An equation of motion for the displacement amount “y” of the point mass in the vertical direction is obtained as expression (1) from the equilibrium of forces of 5 .
[Expression 1] $$m_i\frac{d^2{y}_i}{d{\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="DE112021007859T5\_0010.png,DE112021007859T5\_0012.png"\; state="\{\{state\}\}">t</figure-callout>}}^2}=T_i\frac{y_{i+1}-y_i}{\mathrm{\Delta }x}-T_{i-1}\frac{y_i-y_{i-1}}{\mathrm{\Delta }x}+F_i$$

In this case, the external force in the vertical direction does not act on the timing belt 25 during the opening and closing operation of the first door main body 26. Therefore, assuming that the external force acting on the point mass is zero and the tension T of the timing belt 25 is a constant value, Expression (2) is obtained.
[Expression 2] $$\frac{d^2{y}_i}{d{\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="DE112021007859T5\_0010.png,DE112021007859T5\_0012.png"\; state="\{\{state\}\}">t</figure-callout>}}^2}=\frac{1}{m_i}\frac{T}{\mathrm{\Delta }x}\left(y_{i+1}-2y_i+y_{i-1}\right)$$

From expression (2), it can be seen that a displacement amount y _i of the i-th point mass is determined depending on a displacement amount y _i-1 of the (i-1)-th point mass and a displacement amount y _i+i of the (i+1)-th point mass. This applies to each of the point masses. Specifically, the displacement amount "y" of each of the point masses is determined by the displacement amounts "y" of two point masses that belong to the corresponding point mass.

Now consider a case where the (i-1)-th point mass is a fixed end and this fixed end is subjected to a displacement excitation according to pressure (2). In the device of the car door 12, this case belongs to an excitation of the toothed belt 25 caused by the door motor 22 and the first pulley 23 or the second pulley 24.

Specifically, the door motor 22 generates a torque for driving the first door main body 26. Thus, the timing belt 25 is excited in the vertical direction by the door motor 22. This displacement excitation is expressed by the following expression.
[Expression 3] $$y_{i-1}=A\text{sin}\left(\omega t\right)$$

If expression (3) is substituted into expression (2), one obtains expression (4).
[Expression 4] $$\frac{d^2{y}_i}{d{\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="DE112021007859T5\_0010.png,DE112021007859T5\_0012.png"\; state="\{\{state\}\}">t</figure-callout>}}^2}=\frac{1}{m_i}\frac{T}{\mathrm{\Delta }x}\left(y_{i+1}-2y_i\right)+\frac{1}{m_i}\frac{T}{\mathrm{\Delta }x}A\text{sin}\left(\omega t\right)$$

The stress T and the distance Δx are both constant values. Therefore, from expression (4), it can be seen that the mass of the point mass needs to be increased in order to reduce the vertical acceleration of the point mass caused by the displacement excitation at the fixed end and to reduce the displacement amount of the point mass in the vertical direction.

6 is a model diagram illustrating a model of the upper portion of the timing belt 25 of 2 when one of the fixed ends is subjected to a displacement excitation. 7 is a diagram showing the temporal change of the displacement of five point masses from 6 . In 7 a dotted line represents a case where the masses of all point masses are equal. Furthermore, a solid line represents a case where only the mass of the i-th point mass is larger than the mass of each of the other four point masses.

As in 7 As shown, the displacement amount "y" of each of the point masses in the vertical direction in the case where the mass of one point mass is larger than the mass of each of the other point masses is smaller than in the case where the masses of all the point masses are equal. From this result, which is expressed by the expression (4), it is understood that when the toothed belt 25 is subjected to displacement excitation, an effect of suppressing vibration is achieved by partially increasing the mass of the toothed belt 25.

Next, how the timing belt 25 vibrates as a whole when the mass of the timing belt 25 is partially increased is described using expressions (5) to (9). In this example, the mass of the i-th point mass is larger than the mass of each of the other point masses. In addition, the masses of the four point masses except the i-th point mass are equal.

Expression (5) expresses the displacement amount of the i-th point mass of 6 out of.
[Expression 5] $$\frac{d^2{y}_i}{d{\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="DE112021007859T5\_0010.png,DE112021007859T5\_0012.png"\; state="\{\{state\}\}">t</figure-callout>}}^2}=\frac{1}{m_i}\frac{T}{\mathrm{\Delta }x}\left(y_{i+1}-2y_i\right)+\frac{1}{m_i}\frac{T}{\mathrm{\Delta }x}Asin\left(\omega t\right)$$

Expression (6) expresses the amount of displacement of the (i+1)-th point mass from 6 out of.
[Expression 6] $$\frac{d^2{y}_{i+1}}{\mathrm{<figure-callout\; id="2"\; label="d\; t"\; filenames="DE112021007859T5\_0010.png,DE112021007859T5\_0012.png"\; state="\{\{state\}\}">d</figure-callout>}{t}^{}{}^2}=\frac{1}{m_{i+1}}\frac{T}{\mathrm{\Delta }x}\left(y_{i+2}-2y_{i+1}+y_i\right)$$

Expression (7) expresses the displacement amount of the (i+2)-th point mass of 6 out of.
[Expression 7] $$\frac{d^2{y}_{i+2}}{\mathrm{<figure-callout\; id="2"\; label="d\; t"\; filenames="DE112021007859T5\_0010.png,DE112021007859T5\_0012.png"\; state="\{\{state\}\}">d</figure-callout>}{t}^{}{}^2}=\frac{1}{m_{i+2}}\frac{T}{\mathrm{\Delta }x}\left(y_{i+3}-2y_{i+2}+y_{i+1}\right)$$

Expression (8) expresses the displacement amount of the (i+3)-th point mass of 6 out of.
[Expression 8] $$\frac{d^2{y}_{i+3}}{\mathrm{<figure-callout\; id="2"\; label="d\; t"\; filenames="DE112021007859T5\_0010.png,DE112021007859T5\_0012.png"\; state="\{\{state\}\}">d</figure-callout>}{t}^{}{}^2}=\frac{1}{m_{i+3}}\frac{T}{\mathrm{\Delta }x}\left(y_{i+4}-2y_{i+3}+y_{i+2}\right)$$

Expression (9) expresses the displacement amount of the (i+4)-th point mass of 6 out of.
[Expression 9] $$\frac{d^2{y}_{i+4}}{\mathrm{<figure-callout\; id="2"\; label="d\; t"\; filenames="DE112021007859T5\_0010.png,DE112021007859T5\_0012.png"\; state="\{\{state\}\}">d</figure-callout>}{t}^{}{}^2}=\frac{1}{m_{i+4}}\frac{T}{\mathrm{\Delta }x}\left(-2y_{i+4}+y_{i+3}\right)$$

When the displacement amount y _i , that is, an amplitude of the i-th point mass is decreased, an input yi to the (i+1)-th point mass is decreased. Thus, the displacement amount y _i+i of the (i+1)-th point mass is also decreased. When the displacement amount y _i+i of the (i+1)-th point mass is decreased, a displacement amount y _i+2 of the (i+2)-th point mass is also decreased. Subsequently, a displacement amount y _i+3 of the (i+3)-th point mass and a displacement amount y _i+4 of the (i+4)-th point mass are also decreased in sequence.

In particular, if the mass of the toothed belt 25 is partially increased, the input to an adjacent one of the point masses, that is, a right side of each of the expressions (5) to (9). As a result, the vibration of the toothed belt 25 can be reduced as a whole.

In the device 12 for the car door according to the first embodiment, the mass body 29 is fixed to the toothed belt 25. Further, the mass body 29 is arranged at such a position that it is moved in the direction opposite to the moving direction of the belt gripper 28 during the opening and closing operation of the first door main body 26.

Thus, the vibration of the timing belt 25 can be suppressed. As a result, noise generated during the opening and closing operation of the first door main body 26 and the second door main body 27 can be reduced.

8th is a graph showing, for example, a relationship between door opening/closing time, door speed, and motor torque.

For example, as in 8th As shown in Fig. 1, it is assumed that a maximum speed, that is, a constant speed in the door opening/closing operation of the first door main body 26 is 400 mm/s when the door opening/closing operation has an acceleration region, a constant speed region and a deceleration region. Further, it is assumed that the distance between the plurality of belt teeth 25a is 5 mm. In this case, the toothed belt 25 is excited at 80 Hz at the time of the opening and closing operation of the first door main body 26.

Meanwhile, it is assumed that a linear density “ρ” of the timing belt 25 is 0.065 kg/m, the fixed pitch L which is a distance between a center of the first pulley 23 and a center of the second pulley 24 is 1,500 mm, and the tension T of the timing belt 25 when the motor torque generated by the door motor 22 is constant is 150 N. In this case, if a square root of T/ρ is represented by “α”, a natural frequency of string vibration of the timing belt 25 is: 1/2L×α=16 Hz. Thus, a fifth-order component of the string vibration and an excitation frequency are equal to each other. Therefore, the timing belt 25 can swing widely.

In the first embodiment, the mass body 29 is fixed to the toothed belt 25. This suppresses the resonance between the excitation vibration caused by the meshing of the first pulley 23 and the second pulley 24 and the string vibration in the toothed belt 25.

Furthermore, the mass body 29 is only attached to the toothed belt 25. This enables a simple configuration.

Furthermore, the mass of the mass body 29 is 10% or less of the mass of the door main body 26. This can suppress distortion of the timing belt 25 under the mass of the mass body 29.

Furthermore, the mass of the mass body 29 is 20% or more and 100% or less of a mass of the timing belt 25 per meter. Thus, a distortion of the timing belt 25 under the mass of the mass body 29 can be sufficiently suppressed.

Furthermore, during the opening and closing operation of the first door main body 26, the door control unit 13 maintains the constant maximum speed for 0.5 second or more. Thus, a difference in the width of the cabin can be compensated for simply by changing the time for maintaining the constant maximum speed. Thus, the software setting for controlling the opening and closing operation can be facilitated.

However, in a control method that increases the time for maintaining a constant maximum speed, when the above-described excitation vibration and the string vibration resonate with each other, the resonance state is maintained to thereby increase the vibration. In the first embodiment, the mass body 29 is fixed to the toothed belt 25. Thereby, the oscillation of the toothed belt 25 can be suppressed while facilitating the software setting.

A specific configuration of the mass body 29 is described below. 9 is a side view illustrating the mass body 29 of 2 . 10 is a sectional view along the line XX of 9 .

The mass body 29 comprises a first element 41 having a flat plate shape, a second element 42 and a plurality of fastening means 43.

The first member 41 is held in contact with a surface of the timing belt 25 located on a side opposite to the plurality of belt teeth 25a. A plurality of through holes 41a are formed in the first member 41.

The second member 42 includes a base portion 42a in the form of a flat plate and a plurality of projecting portions 42b serving as stopper portions. The base portion 42a is held in contact with the distal end surfaces of the plurality of belt teeth 25a. The plurality of projecting portions 42b project from the base portion 42a toward the first member 41.

Each of the protruding portions 42b is inserted into a recessed portion between two adjacent ones of the belt teeth 25a and fitted into the recessed portion. Specifically, the plurality of protruding portions 42b are engaged with the plurality of belt teeth 25a. The plurality of belt teeth 25a thus regulates the movement of the mass body 29 in a longitudinal direction of the toothed belt 25 relative to the toothed belt 25. The longitudinal direction of the toothed belt 25 is a direction parallel to an X-axis of 9 .

A plurality of threaded holes 42c are formed in the base portion 42a. For example, a bolt is used for each of the fasteners 43. Each of the fasteners 43 is inserted into a corresponding one of the through holes 41a and screwed into a corresponding one of the threaded holes 42c. The fasteners 43 are arranged on an outer side of the timing belt 25 in a width direction of the timing belt 25. The width direction of the timing belt 25 is a direction parallel to the depth direction of the cabin 8 and parallel to a Y axis of 10 is.

By screwing each of the fastening means 43 into one of the corresponding threaded openings 42c, the toothed belt 25 is clamped between the first part 41 and the second part 42.

With the mass body 29 described above, a displacement of the mass body 29 with respect to the toothed belt 25 can be suppressed.

11 is a side view illustrating a first modification example of the mass body 29 of 2 . 12 is a sectional view along the line XII-XII of 11 .

A mass body 29 in the first modification example includes a fixed member 44 and a plurality of fixing means 45.

The fastening means 44 comprises a first portion 44a having a flat plate shape, a second portion 44b having a flat plate shape and a connecting portion 44c.

The first portion 44a is held in contact with the surface of the timing belt 25 located on a side opposite to the plurality of belt teeth 25a. The second portion 44b is held in contact with the distal end surfaces of the plurality of belt teeth 25a. The connecting portion 44c connects the first portion 44a and the second portion 44b.

A plurality of through holes 44d are formed in the first portion 44a. A plurality of threaded holes 44e are formed in the second portion 44b.

For example, a bolt is used as each of the fastening means 45. Each of the fastening means 45 is inserted into a corresponding one of the through holes 44d and screwed into a corresponding one of the threaded holes 44e. As a result of screwing each of the fastening means 45 into a corresponding one of the fastening holes 44e, the timing belt 25 is clamped between the first portion 44a and the second portion 44b.

The plurality of fasteners 45 are arranged only on an outer side of one end portion of the timing belt 25 in the width direction. The connecting portion 44c is located on an outer side of the other end portion of the timing belt 25 in the width direction.

In the mass body 29 of the first embodiment, the plurality of fasteners 45 are arranged only on the outer side of the one end portion of the timing belt 25 in the width direction. As a result, interference of the mass body 29 by other devices can be suppressed.

As in 9 a plurality of protruding portions serving as stopper portions may be formed on the second portion 44b.

13 is a side view illustrating a second modification example of the mass body 29 of 2 . 14 is a sectional view along the line XIV-XIV of 13 .

The mass body 29 in the second modification example includes a pair of couplings 46 each having an endless shape and a coupled member 47.

The coupled member 47 includes a main portion 47a in the form of a flat plate, a first protruding portion 47b and a second protruding portion 47c.

The main portion 47a is held in contact with the surface of the timing belt 25 located on a side opposite to the plurality of belt teeth 25a. The first projecting portion 47b and the second projecting portion 47c project from the main portion 47a to a side opposite to the timing belt 25 so as to be spaced apart from each other in the longitudinal direction of the timing belt 25.

A U-shaped portion 47d is defined by a surface of the coupling member 47 that is located on a side opposite to the timing belt 25. The U-shaped portion 47d is formed between the first projecting portion 47b and the second projecting portion 47c of the coupling member 47.

Each of the clutches 46 surrounds the main portion 47a and the timing belt 25 to thereby hold the coupled member 47 on the timing belt 25. Each of the clutches 46 is formed, for example, from an annealed wire wound around the main portion 47a and the timing belt 25. In addition, each of the connecting pieces 46 is inserted between two adjacent belt teeth 25a of the timing belt 25 and into the U-shaped portion 47d.

Inserting each of the clutches 46 between two adjacent belt teeth 25a regulates the movement of the mass body 29 in the longitudinal direction of the toothed belt 25 with respect to the toothed belt 25. In detail, each of the clutches 46 functions as a stopper portion.

Also, the mass body 29 of the second embodiment can suppress a displacement of the mass body 29 with respect to the timing belt 25. Furthermore, an increase in the dimension of the mass body 29 in the width direction of the timing belt 25 can be suppressed, and thus the interference of the mass body 29 with other devices can be suppressed.

15 is a side view illustrating a third modification example of the mass body 29 of 2 . 16 is a sectional view along the line XVI-XVI of 15 .

A mass body 29 in the third modification example includes a fixed member 48 and a plurality of fixing means 49.

The fastener 48 includes a main portion 48a having a flat plate shape, a first protruding portion 48b having a flat plate shape, and a second protruding portion 48c having a flat plate shape.

The main portion 48a is held in contact with the surface of the timing belt 25 located on a side opposite to the plurality of belt teeth 25a. The first projecting portion 48b and the second projecting portion 48c project from the main portion 48a to the side of the timing belt 25 so as to be spaced apart from each other in the width direction of the timing belt 25. The timing belt 25 is caused to pass between the first projecting portion 48b and the second projecting portion 48c.

A plurality of through holes 48d are formed in the first projecting portion 48b. A plurality of threaded holes 48e are formed in the second projecting portion 48c.

For example, a bolt is used as each of the fasteners 49. Each of the fasteners 49 is inserted into a corresponding one of the through holes 48d and screwed into a corresponding one of the threaded holes 48e.

Further, each of the fasteners 49 is arranged parallel to the width direction of the timing belt 25 and is inserted between two adjacent belt teeth 25a. Accordingly, the movement of the mass body 29 in the longitudinal direction of the timing belt 25 with respect to the timing belt 25 is regulated. Specifically, each of the fasteners 49 functions as a stopper portion.

Also, the mass body 29 of the third embodiment can suppress a displacement of the mass body 29 with respect to the timing belt 25. Furthermore, an increase in the size of the mass body 29 in the width direction of the timing belt 25 can be suppressed, and thus the interference of the mass body 29 by other devices can be suppressed.

On the fastening elements 43 of 9 , the fastening means 45 of 11 or the fastening means 49 of 15 Rotation stoppers can be provided. The rotation stoppers can be used to prevent the mass body 29 from falling off the toothed belt 25.

In the 9 until 16 In the examples shown, a jointless belt is used as the toothed belt 25. The jointless toothed belt 25 already has an endless shape before it is wound around the first pulley 23 and the second pulley 24.

The use of the jointless toothed belt 25 described above can facilitate the assembly of the cabin door device 12.

In the meantime, as in 17 shown, a belt with a joint can be used as a toothed belt 25. The toothed belt 25 of 17 has a first end portion 25b and a second end portion 25c. The first end portion 25b and the second end portion 25c are connected by the mass body 29. Furthermore, the engagement of the plurality of protruding portions 42b with the plurality of belt teeth 25a prevents the first end portion 25b and the second end portion 25c from slipping out of the mass body 29.

The configuration described above allows easy adjustment of the length of the timing belt 25.

Second embodiment

18 is a side view illustrating a relevant portion of a toothed belt 25 according to a second embodiment. The configuration of a car door device 12 and the configuration of an elevator are the same as those of the car door device 12 and the elevator according to the first embodiment, except for the 18 shown configuration of the timing belt 25.

A weight part 25d is provided at a portion of the timing belt 25 according to the second embodiment in a longitudinal direction. The mass of the portion 25d per unit length is represented by M1. Further, the mass of the other portion 25e per unit length is represented by M0. The other portion 25e is a portion of the timing belt 25 excluding the portion having the weight 25d.

The mass M1 is set to be two or more times larger than the mass M0 by, for example, setting the material density of the weight portion 25d larger than the material density of the other portion 25e. More specifically, M1≥2×M0 is achieved.

The weighted portion 25d is located at such a position that it is moved in a direction opposite to a moving direction of a belt gripper 28 in an opening/closing operation of a first door main body 26. Specifically, the portion 25d is located at the same position as the position of the mass body 29 in the first embodiment.

Even with the configuration described above, the same effects as in the first embodiment can be achieved. In addition, the number of components can be reduced.

When a toothed belt is used for a landing door device 14, the mass body 29 according to the first embodiment or the portion 25d according to the second embodiment can be attached to the toothed belt for the landing door device 14.

Furthermore, the 2 and 3 The door motor 22 shown is a flat motor. The flat motor has a smaller dimension in a direction parallel to its rotary shaft than a dimension in a direction perpendicular to the rotary shaft. However, the door motor 22 may also be an elongated motor. The elongated motor has a larger dimension in a direction parallel to its rotary shaft than a dimension in a direction perpendicular to the rotary shaft.

Furthermore, the 2 and 3 In the device 12 for cabin doors shown, the rotary shaft of the door motor 22 is arranged parallel to the depth direction of the cabin 8. However, the direction in which the rotary shaft of the door motor 22 extends can be changed by providing a gear (not shown) between the door motor 22 and the first pulley 23.

At the 2 and 3 In the device of the car door 12 shown, the first pulley 23 is rotated directly by the door motor 22. However, a speed reduction mechanism (not shown) may be provided between the door motor 22 and the first pulley 23. The speed reduction mechanism includes a first transmission belt and a speed reduction pulley. The diameter of the speed reduction pulley is larger than the diameter of the first pulley 23. The first transmission belt transmits power from the door motor 22 to the speed reduction pulley.

When the speed reduction mechanism is provided between the door motor 22 and the first pulley 23, the door motor 22 may be arranged at a position separate from the first pulley 23, for example on the door bracket 21.

When the speed reduction mechanism is provided between the door motor 22 and the first pulley 23, the speed reduction pulley may be arranged coaxially with the first pulley 23. In this case, the first pulley 23 is rotated together with the speed reduction pulley.

When the speed reduction mechanism is provided between the door motor 22 and the first pulley 23, the speed reduction pulley may be arranged at a position separate from the first pulley 23. In this case, the reduction mechanism includes a transmission pulley and a second transmission belt in addition to the first transmission belt and the speed reduction pulley. The transmission pulley is arranged coaxially with the speed reduction pulley and is rotated together with the speed reduction pulley. The second transmission belt transmits the rotation of the transmission pulley to the first pulley 23.

Furthermore, the number of door main bodies may be one, three or more.

In addition, the overall layout of the elevator is not based on the layout in 1 limited. For example, a descent procedure can be a 2:1 descent procedure.

Furthermore, the elevator can be, for example, a machine room-less elevator, a double-deck elevator, and a single-shaft multi-car system elevator. The single-shaft multi-car system is a system in which an upper car and a lower car arranged directly below the upper car are moved vertically independently of each other in the common elevator shaft.

LIST OF REFERENCE SYMBOLS

12

Cabin door device,

13

Door control unit,

23

first pulley,

24

second pulley,

25

Timing belt,

25a

Belt teeth,

25b

first end section,

25c

second end section,

25d

part by weight,

26

first door main body,

28

Belt gripper,

29

mass body,

42b

protruding section (stopper section),

44

fixed element,

45

Fasteners,

46

Coupling (stopper section),

47

coupled element,

47d

U-shaped section,

48

fixed element,

49

Fasteners (stopper section)

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions.

Cited patent literature

• JP 2008168957 A [0003]

Claims (11)

A side opening type door device for an elevator, comprising: a first pulley (23); a second pulley (24) arranged to be spaced from the first pulley (23); a toothed belt (25) wound around the first pulley (23) and the second pulley (24) and having a plurality of belt teeth (25a); a belt gripper (28) fixed to the toothed belt (25); a door main body (26) connected to the toothed belt (25) through the intermediary of the belt gripper (28) and configured to perform an opening and closing operation by movement of the toothed belt (25) caused by rotation of the first pulley (23) and the second pulley (24); and a mass body (29) attached to the toothed belt (25) and configured to be moved together with the toothed belt (25), wherein the mass body (29) is attached to such a position on the toothed belt (25) that it is moved in a direction opposite to a moving direction of the belt gripper (28) at a time of opening and closing operation of the door main body (26). Side opening type door device for an elevator according to Claim 1 , wherein a seamless belt is used as the toothed belt (25). Side opening type door device for an elevator according to Claim 1 , wherein the toothed belt (25) has a first end portion (25b) and a second end portion (25c), and wherein the first end portion (25b) and the second end portion (25c) are connected by the mass body (29). Side-opening type door device for an elevator according to one of the Claims 1 until 3 , wherein a mass of the mass body (29) is 10% or less of a mass of the door main body (26). Side-opening type door device for an elevator according to one of the Claims 1 until 4 , wherein a mass of the mass body (29) is 20% or more and 100% or less of the mass of the toothed belt (25) per meter. Side-opening type door device for an elevator according to one of the Claims 1 until 5 , wherein the mass body (29) has a stopper portion (42b, 46, 49), and wherein the stopper portion (42b, 46, 49) is inserted between two adjacent teeth of the plurality of belt teeth (25a) and is configured to regulate the movement of the mass body (29) in a longitudinal direction of the toothed belt (25) with respect to the toothed belt (25). Side-opening type door device for an elevator according to one of the Claims 1 until 6 , wherein the mass body (29) comprises a fixed member (44, 48) and a fastening means (45, 49) fastened to the fixed member (44, 48), and wherein the fastening means (45, 49) is arranged only on an outer side of an end portion of the toothed belt (25) in a width direction. Side-opening type door device for an elevator according to one of the Claims 1 until 5 wherein the mass body (29) comprises a clutch (46) having an endless shape and a coupled member (47) coupled to the toothed belt (25) through the clutch (46), a U-shaped portion (47d) being defined by a surface of the coupled member (47) located on a side opposite to the toothed belt (25), and wherein the clutch (46) is inserted between two adjacent ones of the plurality of belt teeth (25a) and into the U-shaped portion (47d). Side-opening type door device for an elevator according to one of the Claims 1 until 5 , wherein the mass body (29) comprises a fixed member (44, 48) and a fastening means (45, 49) fastened to the fixed member (44, 48), and wherein the fastening means (45, 49) is arranged parallel to a width direction of the toothed belt (25) and is inserted between two adjacent ones of the plurality of belt teeth (25a). Side-opening type door device for an elevator according to one of the Claims 1 until 9 , further comprising a door control unit (13) configured to control the opening and closing operation of the door main body (26), wherein the door control unit (13) maintains a constant maximum speed for 0.5 seconds or longer during the opening and closing operation of the door main body (26). A side opening type door device for an elevator, comprising: a first pulley (23); a second pulley (24) arranged to be spaced from the first pulley (23); a toothed belt (25) wound around the first pulley (23) and the second pulley (24) and having a plurality of belt teeth (25a); a belt gripper (28) which is attached to the toothed belt (25); and a door main body (26) connected to the toothed belt (25) through the intermediary of the belt gripper (28) and configured to perform an opening and closing operation by movement of the toothed belt (25) caused by rotation of the first pulley (23) and the second pulley (24), wherein a weight part (25d) is provided at a portion of the toothed belt (25) in a longitudinal direction, a mass of the weight part (25d) per unit length being two or more times larger than a mass of a portion of the toothed belt (25) excluding the weight part (25d) per unit length, and wherein the weight part (25d) is arranged at such a position that it is moved in a direction opposite to a movement direction of the belt gripper (28) at the time of opening and closing operation of the door main body (26).

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