JPH01187190A - Controller for elevator door - Google Patents

Abstract

PURPOSE:To smoothly open and close a door panel by installing an eccentric cam and an approach sensor onto a door position detecting device and continuously detecting the opening/closing position of the door. CONSTITUTION:When a pattern generating circuit 9 is operated by the opening instruction signal 10a for a door panel 1 which is supplied from an operation circuit 10, a motor 6 is drive-controlled through a motor control circuit 11 by an output signal 9a. When the door panel 1 starts opening operation, a shaft 30 and an eccentric cam turn in interlocking with the swing of a door link 2, and the distance from an approach sensor varies. An analogue output approach sensor possesses the characteristic for generating an output signal corresponding to the distance between a detected body and the sensor. Therefore, the signal 7a outputted from the sensor change continuously, and the signal 8a which is corrected in a door position detecting circuit 8 and outputted into the circuit 9 change continuously on the basis of the signal 7a. Therefore, the continuous change of the control electric current for the motor 6 is permitted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an elevator door control device for smoothly controlling the opening/closing speed of a door panel.

(Prior Art) FIG. 1 shows an elevator door opening/closing mechanism and its opening/closing control device.

In FIG. 1, reference numeral 1 indicates a door panel of an elevator door, and this door panel 1 is connected to a door drive motor 6 via a door link 2, a connecting rod 3, a door link drive sprocket 4, and a chain 5. Further, as is clear from the figure, an elevator door position detection device 7 (described in detail with reference to FIG. 6) is connected to the fulcrum of the door link 2.

This type of elevator door opening/closing control is performed as follows.

In FIG. 1, a detection signal 7a from a position detection device 7 is sent to a door position detection circuit 8, from which a door position signal 8 is sent.
a and is sent to the pattern generation circuit 9. Here, the generation pattern 9a is switched according to the door position signal 8a.

The pattern generation circuit 9 operates in response to an opening/closing command from the operation operation circuit 10, and when the command is received, the motor control circuit 11 operates according to the generation pattern 9a, and the door panel 1 is opened and closed.

FIG. 6 shows a conventional elevator door position detection device 7. As shown in FIG.

This position detection bag! f7 is the axis 1 of the fulcrum of the door link 2
The position detection device 7 has a plurality of timing cams 13 fixed on a shaft 12, and a plurality of switches 15 arranged opposite to the timing cams 13.

During the opening/closing operation of the door panel 1, when the door link 2 swings, the timing cam 13 rotates accordingly, the switches 15 are sequentially turned on, and this becomes a detection signal 7a and is sent to the door position detection circuit 8.

(Problems to be Solved by the Invention) By the way, in this type of multi-stage cam type position detection device 7,
Since the detection signal 7a changes stepwise as shown in FIG. 7, the generation pattern 9a that changes according to the level of the detection signal 7a also changes stepwise.

Therefore, near the switching position of generation pattern 9a,
As is clear from the figure, a problem arises in that the opening/closing speed of the door panel 1 changes rapidly and smooth opening/closing operations are no longer performed.

If the number of stages of the timing cam 13 is increased in order to solve this problem, the problem of increased cost and increased size of the device will arise.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an elevator door control device that eliminates the audibility problem of the above-mentioned conventional technology and is capable of continuously detecting the open/closed position of the elevator door.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a shaft that rotates according to the amount of movement of the door panel, an eccentric cam fixed on the shaft, and a shaft that opposes the eccentric cam. The present invention is characterized in that a position detection device is configured with a proximity sensor arranged at That is.

(Function) According to the present invention, when the door panel is opened and closed, the shaft rotates, and the eccentric cam fixed on this shaft rotates. When this eccentric cam rotates, the distance from the proximity sensor placed opposite to it changes. Here, the proximity sensor used has a characteristic of generating an output signal according to the distance between the eccentric cam and the sensor, and a change in distance is output as a change in the output of the sensor.

(Embodiment) Hereinafter, an embodiment of an elevator door control device according to the present invention will be described with reference to FIGS. 1 to 4.

In FIG. 1, reference numeral 1 indicates a door panel of an elevator door, and this door panel 1 is connected to a door drive motor 6 via a door link 2, a connecting rod 3, a door link drive sprocket 4, and a chain 5.

Further, as is clear from the figure, an elevator door position detection device 7 (described in detail with reference to FIG. 2) is connected to the fulcrum of the door link 2.

Further, this door panel 1 is formed to be movable along a hanger rail 22 provided on a hanger case 21, and the upper end is provided with a door hanger 23 and a hanger roller 24.
It is suspended from a hanger rail 22 via a hanger rail 22, and its lower end is guided to a sill 25 on the floor.

These configurations are the same as conventional ones.

According to this embodiment, the position detection device t7 has an eccentric cam 31 fixed to the shaft 30 as shown in FIG. 2, and an analog output proximity sensor 32 arranged to face the eccentric cam 31. It is configured. Here, the shaft 30 also serves as a fulcrum for the door link 2, and when the door link 2 swings, the shaft 30 rotates in conjunction with this.

Next, the operation of this embodiment will be explained.

In FIG. 1, the door panel 1 from the driving operation circuit 10
When the pattern generation circuit 9 is activated by the open command signal 10a, the motor 6 is driven and controlled by the output signal 9a via the motor control circuit 11.

The rotational force of the motor 6 is transmitted to the door panel 1 via a speed reduction device consisting of a chain 5 and a sprocket 4, a connecting rod 3, and furthermore a door link 2, whereby the door panel 1 starts an opening operation.

According to this embodiment, when the door panel 1 starts its opening operation, the shaft 30 and the eccentric cam 31 rotate in accordance with the rocking of the door link 2, and the distance to the proximity sensor 32 changes from g to L. Change. Here, the analog output proximity sensor 32 is the third
As shown in the figure, it has the characteristic of generating an output signal according to the distance between the detection object and the sensor.

Therefore, when the door panel 1 is opened or closed, the proximity sensor 3
The signal 7a output from 2 will change continuously. Therefore, based on this signal 7a, the position signal 8a corrected by the door position detection circuit 8 and output to the pattern generation circuit 9 changes continuously as shown in FIG. .

As a result, the output signal 9a from the pattern generation circuit 9 also becomes
It changes continuously and linearly depending on the position of the door panel 1.

Therefore, when the position detection device according to this embodiment is used, the position signal 8a corresponding to the opening operation position of the door panel 1 is continuously generated, so that the control current to the motor 6 can be continuously changed, which is different from the conventional one. The door panel 1 can be opened and closed more smoothly than when a multi-stage cam type position detection device is used.

In addition, since the sensor 32 uses a non-contact type, it has a long life, is resistant to water, oil, and dust, and has high reliability. Furthermore, it can accurately position the door panel 1 to open and close even immediately after power is restored. can be detected.

Further, in the conventional multi-stage cam type position detection device, wiring is required for the number of switches, but according to this embodiment, the wiring man-hours are significantly reduced. Furthermore, the entire device can be made smaller and lighter than conventional multi-stage cam type position detection devices.

FIG. 5 shows another embodiment in which the position detection device 7 is applied to a belt or chain driven door panel 1.

Here, the door panel 1 is connected to the motor 6 via a chain 35 and a sprocket 36, and the position detection device 7 is connected to the sprocket 36 via a speed reduction device 38. Note that the speed reduction device 38 is set so that the shaft 30 of the position detection device 7 rotates one rotation or less.

The present invention has been described above with reference to embodiments, but the sensor 3
It is also possible to use an analog output photoelectric sensor or the like for 2.

【Effect of the invention〕

As is clear from the above description, according to the present invention, there is provided a shaft that rotates according to the amount of movement of the door panel, an eccentric cam fixed on this shaft, and a proximity sensor arranged opposite to this eccentric cam. Since the position detection device is constituted by the proximity sensor and the eccentric cam, it is possible to continuously generate a position signal indicating the open/closed position of the door panel by detecting a change in the distance between the proximity sensor and the eccentric cam.

Therefore, the door panel of the elevator door can be opened and closed more smoothly than when a conventional multi-stage cam type position detection device is used.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of an elevator door control device according to the present invention, Fig. 2 is a perspective view showing a position detection device according to the present invention, and Fig. 3 shows characteristics of an analog output type proximity sensor. FIG. 4 is a diagram showing the relationship between the door panel position signal and opening/closing speed according to the present invention, FIG. 5 is a front view showing another embodiment of the elevator door control device according to the present invention, and FIG. is a perspective view showing a conventional position detection device;
The figure is a diagram showing the relationship between the position signal and opening/closing speed of a conventional door panel. DESCRIPTION OF SYMBOLS 1... Door panel, 6... Motor, 7... Position detection device, 30... Shaft, 31... Eccentric cam, 32...
・Proximity sensor. Applicant's agent Yu Sato 1 Figure 2 Figure 3

Claims (1)

[Claims] A position detection device is composed of a shaft that rotates according to the amount of movement of the door panel, an eccentric cam fixed on this shaft, and a proximity sensor placed opposite to this eccentric cam. 1. A control device for an elevator door, characterized in that a position signal indicating the open/close position of the door panel is continuously generated by detecting a change in distance between the door panel and the door panel.