JP2873162B2 - Detecting foreign matter trapped in elevator doors - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for detecting a foreign object trapped in an elevator door, which detects that a string-like foreign object such as a rope is inserted in the elevator door.

[0002]

2. Description of the Related Art FIGS. 12 and 13 are front explanatory views showing a schematic structure of an elevator equipped with a conventional foreign matter trapping detecting device. FIG. 12 shows a state in which an elevator car door is fully opened, and FIG. Also shows a fully closed state. FIG.
2. In FIG. 13, 1 is a car room for carrying people and luggage, 2
Is a car door provided on the front of the car room 1, 3 is a car door driving rail attached to the car room frame, 4 is a device for hanging the car door on a driving rail, 5 is a safety shoe, and 6 is a safety shoe. A support arm, 7 is a safety shoe operation detection switch, 8 is a car door fully closed detection switch, 9 is a car fully closed detection switch operation cam fixed to a device 4 for hanging the car door on a driving rail, and 10 is a car door sill. , 11 is a machine room control circuit, 12 is a car door driving device, and 13 is an obstacle placed on the car door sill 10. 8 to 1
As shown in FIG. 1, a landing door 14 and a landing sill 15 that move in conjunction with the cage door 2 are provided in front of the cage door 2. Further, as shown in FIG. 11, a landing door fully closed detection switch 16 and a landing door fully closed detection switch operation cam 17 are provided above and above the landing door 14, respectively.

Next, the operation will be described. In the above-described conventional elevator, after the car door 2 and the landing door 14 are opened and a person gets on and off, the car door 2 and the landing door 14 are completely closed, and the car door fully closed detection switch 8 and the landing door fully closed detection switch 16 are respectively provided. Turns ON. Then, the ON signal is transmitted to the machine room control circuit 11, and the elevator is started. During the door closing operation, as shown in FIG. 12, if there is any obstacle 13 such as luggage in the traveling direction of the door, the safety shoe 5 installed at the tip of the basket door 2 usually detects the obstacle 13. Then, the safety shoe operation detection switch 7 is operated, and the signal is transmitted to the machine room control circuit 11. Then, the machine room control circuit 1
1 performs an operation of outputting a door opening command to the car door driving device 12 and reversing the door opening direction.

[0004] The above-described conventional device for detecting foreign object entrapment in an elevator door can sufficiently accurately detect an object having a certain degree of hardness and thickness, such as luggage, in the front of the door during the door closing operation. As shown in FIGS.
In the situation where the thin soft string-like foreign matter 18 is sandwiched between the car room and the landing, the safety shoe 5 cannot detect the foreign object 18 and the door closing operation is continued. An ON operation signal of the detection switch 16 is transmitted to the machine room control circuit 11, and the elevator is started while a foreign object such as a string is sandwiched between the doors, which may cause an extremely dangerous state.

FIGS. 8 to 10 show specific cases in which the safety shoe 5 does not operate. FIG. 8 respectively shows the case in which the string-like foreign matter 18 is easily bent due to softness, and the safety shoe 5 does not operate. In this case, FIG.
8 is caught in the gap below the safety shoe 5 and the safety shoe 5 does not operate, and FIG. 10 shows that a string-like foreign material 18 is caught between the car door sill 10 and the lower part of the car door 2. , The safety shoe 5 does not operate.

[0006]

As described above, a conventional elevator equipped with a device for detecting a foreign object caught in an elevator door has a small string-like soft object such as a rope in an elevator state in which the object extends between a car room and a landing. It could not detect that it was caught in the door. Therefore, when a power cord, a string, or the like of the vacuum cleaner is caught under the door of the elevator, the vehicle travels with the foreign material caught without being detected. This can lead to accidents such as elevator failures, dogs hanging in the collar, and
In some cases, there was a problem that a personal injury could occur. Therefore, it is an issue to solve such a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the elevator travels while a string-like foreign object such as a rope is sandwiched between the elevator door and the car room and the landing. Obtaining a foreign object trapping detection device for an elevator door that prevents a user disaster caused by a string or the like wrapping around a user inside or at a landing, damage to an elevator device, a failure to lock an elevator by shutting off a car door and a landing door switch, and the like. The purpose is to:

[0008]

According to the present invention, there is provided a device for detecting a foreign object being caught in an elevator door, wherein a full closing operation of a car door is completed.
With a rotating shaft that rotates after completion and before the elevator starts ,
A detection rod driving device having a detection rod having a length abutting on a foreign object such as a string sandwiched across the hall from the car room of the elevator is fixed to the rotation shaft, and is provided between the car door and the hall door, When the rotation shaft rotates, the detection rod abuts against foreign matter and hinders rotation, so that the foreign matter is detected before the elevator travels, and the elevator is prevented from traveling.

The detection rod driving device includes a stepping motor, and includes torque means having a function of providing a rotating torque and a stationary torque, and rotation angle detecting means having an encoder function of detecting a rotation angle.

[0010]

In the device for detecting foreign object entrapment in an elevator door according to the present invention, the rotation shaft is linked to the full closing operation of the car door by a signal from the car door full closing detection switch output by the full closing operation of the car door. When rotated, the detection rod fixed to this rotating shaft comes into contact with a string-shaped foreign object that is pinched from the elevator car room to the landing,
Rotation is hindered. By preventing the rotation of the rotating shaft in this way, it is detected before the elevator travels that the string-like soft object is trapped from the elevator car room to the landing, and based on the detection signal, The drive control device of the elevator can be operated to prevent the traveling of the elevator.

[0011]

【Example】

Embodiment 1 FIG. An embodiment of the present invention will be described below with reference to FIGS. In the figure, a car door 2, a device 4 for hanging the car door on a car door drive rail 3, a safety shoe 5, an arm 6 supporting the safety shoe, a car door full-close detection switch 8, a car full-close detection switch operating cam 9, a car door Threshold 1
0, the configuration of the machine room control circuit 11 is the same as that of the prior art, and the description is omitted.

A detection rod driving device 20 having a stepping motor (not shown) is fixed to the outer surface of the car door 2. The detection rod driving device 20 has a function of applying a rotating torque and a stationary torque to the rotating shaft 21 by the function of a stepping motor, and can rotate the rotating shaft 21 at an arbitrary angle to stop the rotating shaft 21 at that position. It is configured to also have the function of an encoder that can detect the rotation angle of the shaft 21. The rotating shaft 21 has a rod shape, and a detection rod 22 having a length sufficient to reach a foreign substance to be detected is fixed to an end. The detection rod drive device 20 is connected to the machine room control circuit 11 via a detection rod control device 23 installed in the elevator machine room. The detection rod control device 23 has a function of outputting a drive command to the detection rod drive device 20 including a stepping motor and a function of reading an output as an encoder for detecting the rotation angle of the rotating shaft 21. Similarly to the conventional example shown in FIGS. 8 to 11, at the front side of the car door 2, a hall door 14 that moves in conjunction with the car door 2 and a hall threshold 15 are provided, and
Above and above the landing door 14, a landing door fully closed detection switch 16 and a landing door fully closed detection switch operation cam 17 are provided, respectively.
Are provided.

Next, the operation of this embodiment will be described.
As described above, the detection device of the present embodiment, which includes the detection rod driving device 20, the rotating shaft 21, the detection rod 22, and the detection rod control device 23, detects a foreign object trapped in the elevator door. As a result, the rotating shaft 21 of the stepping motor provided in the detection rod driving device 20 can be continuously rotated at an arbitrary angle of 360 degrees, and a static torque can be generated at an arbitrary position. , 2
The rotating shaft 21 can be fixed at an arbitrary position such as 2A and 22B. Normally, as shown in FIG. 2, the rotating shaft 21 is provided with a detection rod 22 fixed to the distal end of the rotating shaft 21.
Is controlled by the detection rod control device 23 so that a fixed torque is generated such that the direction of rotation of the basket sill is perpendicular to the upper surface of the basket sill 10 and is stationary. This position is defined as the fixed position of the detection rod 22.

1 to 3, when the ON signal of the car door full-close detection switch 8 and the ON signal of the landing door full-close detection switch 16 (FIG. 11) are sent to the machine room control circuit 11 at the end of the door closing operation. Then, the command to start the elevator is interrupted, and the detection rod control device 23 outputs a command to the detection rod driving device 20 to rotate the rotating shaft 21 clockwise (360 degrees). When the detection rod driving device 20 receives the instruction and rotates the rotation shaft 21 one clockwise, the detection rod 22 attached to the end of the rotation shaft 21 moves between the basket door threshold 10 and the landing threshold 15. One rotation in space. One rotation of the rotation shaft 21 is transmitted to the detection rod control device 14 by the rotation angle detection function of the detection rod drive device 20. If the time required for one rotation is within a specified time, the machine room control circuit 11
Starts the elevator. This one rotation of the detection rod is always performed after the door is closed.

FIGS. 4 and 5 and FIGS. 6 and 7 show examples of a mode in which a string-like foreign material 18 is sandwiched between the basket sill 10 and the landing sill 15, respectively. Objects are sandwiched between the lower part of the basket threshold and the lower part of the landing threshold,
This shows a state in which the detection rod abuts on a string-shaped object and cannot be rotated.
6 and 7 show a state in which the string-shaped object is sandwiched between the car door and the landing door, the detection rod 22 contacts the string-shaped object, and the detection rod cannot be rotated.

After the door is closed, the detection rod 22 is
Attempts to make one clockwise rotation in response to a command from 3,
(1) The detection rod 22 hits the foreign substance 24 and cannot make one rotation. Or (2) the detection rod 22 is a string-like foreign substance 1
Due to the mechanical load caused by contact with 8, it takes more than a specified time to make one rotation. In any of the above cases,
Preventing the starting of the elevator based on the computation result of the signal from the machine room control circuit 11 detects rod control device 23, the door causes the door to open <br/>. In the case of (1), before the door opening operation, the detection rod 2
2 is rotated counterclockwise to return the detection rod 22 to the original fixed position, and then the door opening operation is performed.

Therefore, not only when a thick and hard foreign substance is caught in the cage door 2 but also when a soft foreign substance in the form of a string such as a rope is caught, a situation in which the elevator travels as it is may occur. Eliminate dangerous driving completely.

[0018]

As described above, according to the present invention,
The detection rod is rotated in conjunction with the fully closed operation of the car door, and if there is a string-like foreign object caught in the elevator door, the presence of the foreign object is determined by utilizing the fact that the detection rod does not rotate normally. Detected before the start of the elevator to prevent the start of the elevator, so that not only thick and hard foreign substances, but also rope-like or other string-like soft foreign substances can be pinched in any position of the elevator door. Even so, it is possible to completely eliminate the situation in which the vehicle travels as it is, and to enhance safety.

Therefore, the following effects can be obtained.

(1) The occurrence of a user disaster caused by a string wrapping around a user or a pet or the like in a car or a landing is prevented.

(2) It is possible to prevent the breakage of the equipment due to the string or the like wrapping around the elevator equipment and to prevent the elevator from becoming inoperable due to the damage of the equipment.

(3) The string pushes the basket door in the opening direction,
The cage door fully closed switch is shut off to prevent the elevator from being disabled between floors.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of an elevator provided with an embodiment of a foreign object entrapment detecting device according to the present invention.

FIG. 2 is an explanatory front view showing the entire configuration of the elevator of FIG. 1;

FIG. 3 is an explanatory diagram showing each position of the detection rod when the detection rod of the foreign object entrapment detection device of the present invention makes one rotation.

FIG. 4 is a side view showing a state in which a string-shaped object is sandwiched between a lower part of a basket sill and a lower part of a landing sill and a detection rod abuts on the string-shaped object and cannot be rotated in one embodiment of the present invention.

FIG. 5 is an explanatory front view of the elevator in the state of FIG. 4;

FIG. 6 is an explanatory side view showing a state in which a string-shaped object is sandwiched between a car door and a landing door and a detection rod abuts on the string-shaped object and the detection rod cannot be rotated in one embodiment of the present invention.

FIG. 7 is an explanatory front view of the elevator in the state of FIG. 6;

FIG. 8 is a cross-sectional view of a portion where a string-like object is sandwiched between a car door and a landing door in a conventional device for detecting foreign object jamming in an elevator door, as viewed from above.

FIG. 9 is a cross-sectional view of a portion where a string-shaped object is sandwiched between lower parts of a safety show, as viewed from above, in a conventional device for detecting a foreign object being caught in an elevator door.

FIG. 10 is a cross-sectional view of a portion where a string-shaped object is sandwiched between a lower part of a car door and a lower part of a landing door in the conventional apparatus for detecting foreign object entrapment in an elevator door, as viewed from above.

FIG. 11 is an explanatory diagram showing a state in which a car door and a landing door are fully closed in a conventional device for detecting foreign object entrapment in an elevator door.

FIG. 12 is an explanatory front view showing a state in which a car door is fully opened in a conventional device for detecting foreign object entrapment in an elevator door.

FIG. 13 is an explanatory front view showing a state in which a car door is fully closed in a conventional device for detecting foreign object entrapment in an elevator door.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Car room 2 Car door 3 Car door drive rail 4 Device for hanging the car door on the drive rail 5 Safety shoe 6 Arm supporting the safety shoe 7 Safety shoe operation detection switch 8 Car door fully closed detection switch 9 Car door fully closed detection Switch operation cam 10 Car door sill 11 Machine room control circuit 12 Car door drive device 14 Hall door 15 Hall sill 16 Hall door full-close detection switch 17 Hall door full-close detection switch operation cam 18 String-like foreign matter 20 Detection rod drive 21 Rotary axis 22 Detection rod 23 Detection rod control device

Claims (2)

(57) [Claims] 1. After the full closing operation of the car door is completed, the elevator
A detection rod driving device comprising a rotation shaft that rotates before the start of the vehicle, and a detection rod having a length that abuts against a foreign matter such as a string sandwiched from a car cabin of an elevator to a landing is fixed to the rotation shaft. Provided between a car door and a landing door, when the rotating shaft rotates, the detection rod abuts against foreign matter to prevent rotation, so that the foreign matter is detected before the elevator travels, and the elevator travels. A device for detecting foreign matter being caught in an elevator door, characterized in that the foreign matter is prevented. 2. The apparatus for detecting foreign object entrapment in an elevator door according to claim 1, wherein the detection rod driving device includes a stepping motor, a torque means for applying a rotational torque and a static torque, and a rotational angle for detecting a rotational angle. A device for detecting foreign matter being caught in an elevator door, comprising: a detection unit.