JPH10114484A - Engagement checking device of elevator door - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate work for adjusting the distance between an engaging roller and a vane. SOLUTION: An engaging checking device of an elevator door is provided with a position detecting plate 16 provided on a landing door 1, a laser device 17 for irradiating the position detecting plate 16, and a detector 18 for integrating a change of an optical path. The detector 18 integrates the number of grooves 16b of the position detecting plate 16 as the time of the change of the reciprocating required time of the radiating light with the change of the optical path by the depth of the groove, the distance between an engaging roller 7 and a vane 8 can be easily confirmed from the times, and the positional adjustment of an attaching fitting supporting the engaging roller 7 is correctively performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator door engagement inspection device for monitoring a distance between an engagement roller provided on an elevator landing door and a vane provided on a car door. .

[0002]

2. Description of the Related Art FIG. 8 is a front view schematically showing a landing door 1 and a car door 5, which are conventional elevator doors, from the landing side. FIG. 9 is an enlarged schematic view of the upper surface of the right half of FIG. In the following, the respective positions when the landing door 1 and the car door 5 are open (the positions indicated by solid lines in FIG. 8) are open positions, and the respective positions when the doors are closed (the positions indicated by dotted lines in FIG. 8). ) Is called the closed position. Also,
Since the operation of the double-opening elevator door as shown in the figure is symmetrical, the following description will be made only for the elevator door on the right side when viewed from the landing side.

As shown in FIGS. 8 and 9, a landing door 1 is provided.
Is hung on a hanger 4 movable along a hanger track 3 provided on a side wall 2 a of the hoistway 2. The car door 5 also has a mechanism similar to that of the landing door 1 and has a car 6 by a hanger truck 3a and a hanger 4a.
It is attached to open and close freely.

An engaging roller 7 is attached to the back surface of the hanger 4 of the landing door 1 via an attachment 9. The engagement roller 7 has a roller 7a and a movable roller 7b,
Each is rotatably supported by a mounting bracket 9. It should be noted that the movable roller 7b is arranged with respect to the roller 7a by an arrow a in FIG.
Can be moved in the direction of. The position at which the mounting bracket 9 that supports the roller 7a and the movable roller 7b is mounted on the hanger 4 can be adjusted right and left in the figure. The dimension that the roller 7a and the movable roller 7b have in the horizontal direction at the closed position of the landing door 1 is Smm (hereinafter, referred to as an interval S), and this value is always constant.

[0005] On the back surface of the car door 5, a vane 8 composed of a fixed vane 8a and a movable vane 8b is provided. Here, the fixed vane 8a is fixed to the car door 5, while the movable vane 8b is provided on the car door 5 so as to be movable with the movement of the car door 5 toward the fixed vane 8a. Fixed vane 8 in closed position of car door 5
The distance between a and the movable vane 5b is Rmm (hereinafter referred to as the distance R). Note that the interval R is wider than the interval S, and
When the car door 5 is in the closed position, the value is always kept constant.

As shown in FIG. 9, the car 6 has a driving device (not shown) for driving the car door 5 and a limit switch connected to the driving device for stopping the car door 5 at the open position. 10, while the car door 5 includes a cam 11 for operating the limit switch 10.

When the car 6 passes through each stop floor where the landing door 1 is provided, or when the car 6 is at each stop floor, the landing door 1 and the car door 5 are closed (in the closed position). In a certain state, the engagement roller 7 is located between the fixed vane 8a and the movable vane 8b (a state shown by a dotted line in FIGS. 8 and 9). At this time, the movable roller 7b and the fixed vane 8a
Is T1 mm, and the distance between the roller 7a and the movable vane 8b is T2 mm (hereinafter, referred to as a distance T1 and a distance T2, respectively).

When the car 6 moves along the hoistway 2, the landing door 1 and the car door 5 are in the closed position. At this time, since the movable roller 7b and the fixed vane 8a maintain the interval T1 and the roller 7a and the movable vane 8b maintain the interval T2mm, when the car 6 passes the stop floor where the landing door 1 is provided, The vanes 8 pass without touching the engagement rollers 7.

However, the car 6 stops on any floor,
When the car door 5 is opened by a driving device (not shown), the fixed vane 8a moves as the car door 5 moves to the right in the drawing.
Engages with the movable roller 7b (that is, the interval T1 disappears). At the same time, the movable vane 8b drawn toward the fixed vane 8a by the operation mechanism (not shown) engages with the roller 7a (that is, the interval T2 is eliminated). When the car door 5 is further opened in a state where the engaging roller 7 and the vane 8 are engaged, the landing door 1 is moved to the car door 5.
It is structured to open in conjunction with. When the car door 5 and the landing door 1 are closed from the open position, the operation is reverse to that described above.

When the landing door 1 and the car door 5 are both in the open position, the distance between the fixed vane 8a and the movable vane 8b is R0 mm, and the distance between the roller 7a and the movable roller 7b is
Have a horizontal dimension of S0 mm, where R0 = S0.

However, when the landing door 1 and the car door 5 are closed, an object is pinched when the door is closed, or the mounting position of the mounting bracket 9 that supports the engaging roller 7 is shifted due to long-term use. Since the intervals T1 and T2 between the mating roller 7 and the vane 8 are shifted, the vane 8 comes into contact with the engaging roller 7 when the vane 8 passes by the engaging roller 7 as the car 6 moves. Cases arise. In such a case, the elevator door locking device (not shown) is activated, and the safety device that detects this activates, thereby stopping the car 6. Therefore, in order to prevent such inconvenience, the engagement roller 7
It is necessary to periodically inspect the mounting position of the mounting bracket 9 that supports the, and to perform maintenance work to maintain the above-mentioned intervals T1 and T2 at a constant value.

[0012]

However, in the maintenance work for adjusting the distances T1 and T2 between the vane 8 and the engaging roller 7, the worker sets the distances T1 and T2 for each floor. In addition to having to visually confirm the operation, it is difficult to perform the work itself, and the adjustment of the intervals T1 and T2 is also performed by the worker's judgment, so that the intervals T1 and T2 for each floor after the maintenance work vary. was there.

Accordingly, an object of the present invention is to provide a device for measuring the distance between an engaging roller and a vane provided on each of a landing door and a car door of an elevator, thereby improving the efficiency of inspection work and improving the efficiency of each floor. It is an object of the present invention to provide an elevator door engagement inspection device capable of preventing the variation of these intervals in the above.

[0014]

An elevator door engagement checking device according to the present invention is provided on a car that moves up and down in a hoistway of an elevator, a vane provided on a car door side, and a landing door side, An engaging roller that engages with the vane during the opening and closing operation of the car door to open and close the landing door in conjunction with the car door, optical means provided on the car, and optical means provided on the landing door, A position detection plate that receives the irradiation light, and a detection unit that detects an interval between the vane and the engagement roller at a closed position of the car door and the landing door based on a change in light passing through the position detection plate. is there.

The position detecting plate is a comb-shaped member having a groove provided in a direction perpendicular to the opening / closing direction of the landing door and in a direction in which irradiation light from the optical means is irradiated vertically. Detecting the interval between the vane and the engaging roller by integrating the number of grooves as the number of changes in the required reciprocating time of the irradiation light due to a change in the optical path length according to the depth of the grooves. Is what you do.

Further, the position detecting plate is a step-shaped member which is perpendicular to the opening / closing direction of the landing door and has a step in a direction in which irradiation light from the optical means is irradiated vertically. The distance between the vane and the engagement roller is detected by integrating the number of changes in the optical path length due to the step as the number of changes in the required reciprocating time of the irradiation light.

Further, the optical means is an optical laser device.

Further, the position detecting plate is provided with a plurality of slits in a direction parallel to the opening / closing direction of the landing door and in a direction in which irradiation light from the optical means is irradiated vertically.
The interval between the vane and the engaging roller is detected by integrating the number of times of transmission of light transmitted through the gap of the slit as the number of times light is received by the optical means.

Further, the optical means is a photoelectric switch.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a side view schematically showing an elevator including an elevator door engagement inspection device according to Embodiment 1 of the present invention. FIG. 2 is a front view schematically showing a landing door 1 and a car door 5 of the elevator including the elevator door engagement inspection device according to Embodiment 1 of the present invention from the landing side. FIG. 3 is a diagram schematically showing the upper surface of the left half of FIG. 2 in an enlarged manner from the car side.

As shown in FIGS. 1 and 3, the elevator door engagement inspection device according to the first embodiment of the present invention includes a position detecting plate 16 screwed to the upper end of the landing door 1, a car 6 And a laser device 17 which is an optical unit attached to the upper surface of the laser device. The laser device 17 mounted on the upper surface of the car 6 is connected to a detector 18 which is a detecting means for detecting the position of the irradiation point on the position detecting plate 16.
In addition, as shown in FIG.
A D converter 18a, a microcomputer 18b, and a display unit 18c are provided.
8b is connected to the limit switch 10. The display section 18c is for displaying the distance between the engagement roller 7 and the vane 8.

FIG. 4 is an enlarged schematic view showing an elevator door engagement inspection device according to Embodiment 1 of the present invention. As shown in FIG. 4, the position detection plate 16 is
a is a comb-shaped member provided with 40 grooves at 0.5 mm intervals so as to irradiate the laser light from the laser device 17 perpendicularly to the opening and closing direction of the landing door 1 with a groove 16 b having a width of 0.5 mm. is there. The irradiation surface 16 located between the 20th groove 16b from the left in the figure and the 20th groove 16b from the right in the figure.
a (that is, the irradiation surface 16 located at the center of the 40 grooves 16b)
a) is set as a base point 16c, and as shown in FIG. 3, the laser device 17 moves the landing door 1 to the normal open position.
The irradiation light of the laser device 17 is applied to the base point 16 of the position detection plate 16.
It is arranged to irradiate c.

Therefore, as shown in FIG.
6, the range in which the position can be actually detected is a section of 40 mm centering on the base point 16c (that is, 20 mm left and right in the figure centering on the normal open position). When the position of the landing door 1 in the open position exceeds this range due to the positional shift of the mounting bracket 9 being supported,
Since it is impossible at first, the position detection plate 16 having such a size is sufficient.

The laser device 17 includes an irradiation unit and a light receiving unit (both not shown). The microcomputer 18b connected to the laser device 17 via the A / D converter 18a has not only a function of calculating the required reciprocating time of the laser light based on the irradiation and light receiving signals of the laser device 17, but also a reciprocating operation. A function of integrating the number of changes in the required time and calculating the interval between the engagement roller 7 and the vane 8 is also provided.

Therefore, with the elevator door engagement checking device according to the first embodiment of the present invention being operated, the landing door 1 is opened in conjunction with the car door 5 as shown in FIGS. (The landing door 1 moves in the direction of the arrow a in the figure), and the irradiation point of the laser beam scans on the irradiation surface 16a of the position detection plate 16 from the right side to the left side in the figure. At this time, when the limit switch 10 is operated, the microcomputer 18b determines the number of the grooves 16b to be irradiated with the laser light until the landing door 1 stops at the closed position in conjunction with the car door 5 by the groove 16b. Are integrated as the number of changes in the required reciprocating time of the laser light caused by the change in the optical path length of the laser light by the depth. Note that the integration performed by the microcomputer 18b ends when the limit switch 10 operates.

At this time, if the number of changes in the required reciprocating time calculated by the microcomputer 18b is 20 times before the landing door 1 stops at the open position due to the operation of the limit switch 10, the laser beam will reach the base point 16c. The landing door 1 is in the normal open position (ie, at the interval T1,
There is no shift in T2).

Further, as described above, the grooves 16b having a width of 0.5 mm are formed at intervals of 0.5 mm on the irradiation surface 16a, so that the laser beam irradiates the grooves 16b with the movement of the landing door 1. And before irradiating the adjacent groove 16b,
This means that the landing door 1 has moved by 1 mm. Therefore, if the number of changes in the required round trip time accumulated by the microcomputer 18b is 20-N times, the landing door 1 is shifted Nmm to the left from the normal open position in the figure, and if it is 20 + N times,
The landing door 1 is shifted by N mm to the right in the drawing from the normal open position.

Such a positional deviation of the landing door 1 from the normal open position in the open position corresponds to a deviation in the mounting position of the mounting bracket 9 of the engagement roller 7 with respect to the hanger 4. Here, the intervals corresponding to the intervals T1 and T2 when the mounting position of the mounting bracket 9 is displaced are U
1, U2.

The number of changes in the required round-trip time is 20-N times,
That is, when the landing door 1 in the open position is shifted Nmm to the left in the drawing from the normal open position, the mounting bracket 9 is shifted Nmm to the right from the normal mounting position, and U1 =
T1-Nmm, U2 = T2 + Nmm. When the number of times of the change of the required round-trip time is 20 + N times, that is, when the landing door 1 is shifted Nmm to the right side in the figure from the normal open position,
The mounting bracket 9 is shifted to the left by N mm from the normal mounting position, and U1 = T1 + Nmm and U2 = T2-Nm.
m.

Therefore, the microcomputer 18b
When the number of changes in the required round-trip time is detected 20 + N times, U1 and U2 are displayed on the display unit 18c as U1 = T1-Nm, respectively.
m, U2 = T2 + Nmm, so the worker
The mounting position of the mounting bracket 9 may be shifted to the left by N mm. Conversely, when the microcomputer 18b detects the number of changes in the required round-trip time 20-N times, the microcomputer 18b displays the display unit 18c.
Where U1 and U2 are respectively U1 = T1 + Nmm and U2 = T
Since it is displayed as 2-N mm, the operator may shift the mounting position of the mounting bracket 9 to the right by N mm.

As described above, using the elevator door engagement inspection device according to Embodiment 1 of the present invention,
Engaging roller 7 at the closed position of landing door 1 and car door 5
The gap between the intervals T1 and T2 between the blade and the vane 8 can be easily checked on the display unit 18c, so that the time and effort for maintenance work of the engagement roller 7 can be largely saved, and by accurately checking the interval, Maintenance work for adjusting the mounting position of the mounting bracket 9 that supports the engagement roller 7 with respect to the hanger 4 can be performed more accurately.

Embodiment 2 FIG. FIG. 5 is an enlarged top view showing an essential part of an elevator door engagement inspection device according to Embodiment 2 of the present invention. In the second embodiment, the configuration other than the position detection plate 20 conforms to the first embodiment. As shown in FIG. 5, the position detection plate 20 is screwed to the upper end of the landing door 1. Further, the position detection plate 20 has a stepped irradiation surface 20 provided so as to be perpendicular to the opening and closing direction of the landing door 1 and to be irradiated with the laser beam from the laser device 17 vertically.
a. The width of the irradiation surface 20a in the opening and closing direction of the landing door 1 is 1 mm.

There are 40 stepped irradiation surfaces 20a,
A base point 20b is provided at the 20th stage from the right in the figure. Such a position detection plate 20 is in a state where the landing door 1 is completely opened,
That is, when the landing door 1 is in the normal open position, the irradiation light of the laser device 17 provided on the upper surface of the car 6 is applied to the base point 20b.
It is arranged to irradiate the light.

Therefore, when the landing door 1 is opened in conjunction with the car door 5 with the elevator door engagement inspection device according to the second embodiment of the present invention being operated (the landing door 1 is indicated by an arrow a in the figure).
Direction), the irradiation point of the laser beam has a stepped irradiation surface 20.
a is scanned from right to left in the figure. At this time,
The microcomputer 18b accumulates the number of changes in the required reciprocating time of the laser light due to the change in the optical path length as the irradiation point rises stepwise on the irradiation surface 20a.

As described above, the microcomputer 18b calculates the number of irradiation surfaces 20a to be irradiated on the laser device by the time the limit switch 10 is operated and the landing door 1 stops at the open position. If the number of changes is 20-N times, the landing door 1 is shifted Nmm to the left from the normal open position in the figure, and if it is 20 + N times, the landing door 1 is shifted to the right from the normal open position in the figure. It can be confirmed that it is shifted by N mm.

Accordingly, similarly to the first embodiment, the above-described interval T when the mounting position of the mounting bracket 9 is displaced is determined.
Assuming that the intervals corresponding to T1 and T2 are U1 and U2, respectively, the microcomputer 18b detects the number of changes in the required round-trip time 20 + N times and displays the U / N on the display 18c.
1, U2 = U1 = T1-Nmm, U2 = T2 +
Since it is displayed as N mm, the worker may shift the mounting position of the mounting bracket 9 to the left by N mm. Further, the microcomputer 18b sets the number of times of change of the required round-trip time to 20-N
Times, U1 and U2 are displayed on the display unit 18c.
Since 1 = T1 + Nmm and U2 = T2-Nmm are displayed, the worker may shift the mounting position of the mounting bracket 9 to the right by Nmm.

As described above, by using the elevator door engagement inspection device according to Embodiment 2 of the present invention,
Engaging roller 7 at the closed position of landing door 1 and car door 5
The gap between the intervals T1 and T2 between the blade and the vane 8 can be easily checked on the display unit 18c, so that the time and effort for maintenance work of the engagement roller 7 can be largely saved, and by accurately checking the interval, Maintenance work for adjusting the mounting position of the mounting bracket 9 that supports the engagement roller 7 with respect to the hanger 4 can be performed more accurately.

Embodiment 3 FIG. 6 is an enlarged top view showing a main part of an elevator door engagement inspection device according to Embodiment 3 of the present invention. In the elevator door engagement inspection device according to the third embodiment, the configuration other than the photoelectric switch 30, the position detection plate 31, and the microcomputer 32, which are optical means, is the same as that of the first embodiment.

As shown in FIG. 6, the photoelectric switch 30 is
It is disposed so as to protrude from the upper part of the car 6 to the landing door 1 side via the fixing bracket 33. Further, the position detection plate 31
Is screwed to the upper end of the landing door 1 so that the position detection plate 31 is parallel to the opening / closing direction of the landing door 1 and irradiates the irradiation light from the irradiation unit 30a of the photoelectric switch 30 vertically. It has a slit 31b provided on the irradiation surface 31a. The opening width of the landing door 1 in the opening and closing direction of the landing door 1 is 1 mm, and 40 slits 31b are provided on the irradiation surface 31a at 1 mm intervals.

The position detecting plate 31 has a 20th slit 31b from the left side in the figure and a 20th slit 3b from the right side in the figure.
A base point 31c is provided on the irradiation surface 31a between the base point 31b and the irradiation surface 1b. Such a position detection plate 31 causes the car 6 to move when the landing door 1 is completely opened, that is, when the landing door 1 is in a normal open position.
Is arranged so that the irradiation light of the photoelectric switch 30 provided on the upper surface of the light source irradiates the base point 31c.

Therefore, when the landing door 1 is opened in conjunction with the car door 5 with the elevator door engagement inspection device according to Embodiment 3 of the present invention being operated (the landing door 1 is moved in the direction indicated by the arrow a in the figure).
Direction), the irradiation light scans the irradiation surface 31a from the right side to the left side in the figure. At this time, the microcomputer 31 accumulates the number of transmissions of the irradiation light transmitted through the slit 31b detected by the light receiving unit 30b of the photoelectric switch 30.

As described above, the microcomputer 18b calculates the number of irradiation surfaces 20a to be irradiated on the laser device by the time the limit switch 10 is operated and the landing door 1 stops at the open position. 20-N transmission times
If it is a turn, the landing door 1 is N
If it is 20 mm + N times, it can be confirmed that the landing door 1 is shifted N mm to the right in the figure from the normal open position.

Accordingly, similarly to the first and second embodiments, the intervals corresponding to the intervals T1 and T2 when the mounting position of the mounting bracket 9 is displaced are set to U, respectively.
If the microcomputer 18b detects the number of transmissions of the irradiation light transmitted through the slit 31b 20 + N times, the microcomputer 18b displays U1 and U2 on the display unit 18c, respectively.
= T1-Nmm and U2 = T2 + Nmm, so that the operator may shift the mounting position of the mounting bracket 9 to the left by N mm. When the microcomputer 18b detects the number of transmissions of the irradiation light transmitted through the slit 31b 20-N times, the microcomputer 18b displays U1 and U2 on the display unit 18c, respectively.
Since T1 + Nmm and U2 = T2-Nmm are displayed,
The operator may shift the mounting position of the mounting bracket 9 to the right by N mm.

As described above, if the engagement inspection device for an elevator door according to the third embodiment of the present invention is used,
Engaging roller 7 at the closed position of landing door 1 and car door 5
The gap between the intervals T1 and T2 between the blade and the vane 8 can be easily checked on the display unit 18c, so that the time and effort for maintenance work of the engagement roller 7 can be largely saved, and by accurately checking the interval, Maintenance work for adjusting the mounting position of the mounting bracket 9 that supports the engagement roller 7 with respect to the hanger 4 can be performed more accurately.

[0045]

According to the present invention, there is provided an elevator door engagement inspection device which is provided on an elevator hoistway, and includes a car, a vane provided on a car door side, and a car door provided on a landing door side. An engaging roller that engages with the vane during operation to open and close the landing door in conjunction with the car door, optical means provided on the car, and illumination light provided on the landing door and received from the optical means. And a detecting means for detecting an interval between the vane and the engaging roller at a closed position of the car door and the landing door based on a change in light passing through the position detecting plate. The distance between the vane and the engagement roller at the door closed position can be easily confirmed, and the work efficiency of maintenance and inspection for inspecting and adjusting the engagement roller can be improved.

The position detecting plate is a comb-shaped member having a groove provided in a direction perpendicular to the opening / closing direction of the landing door and in a direction in which the irradiation light from the optical means is irradiated vertically. Detecting the interval between the vane and the engaging roller by integrating the number of grooves as the number of changes in the required reciprocating time of the irradiation light due to a change in the optical path length according to the depth of the grooves. Therefore, the gap between the vane and the engagement roller can be accurately grasped by the engagement inspection device having a simple structure.

The position detecting plate is a step-like member having a step perpendicular to the opening / closing direction of the hall door and having a step in a direction in which the irradiation light from the optical means is irradiated vertically. The interval between the vane and the engaging roller is detected by integrating the number of changes in the optical path length due to the step as the number of changes in the required reciprocating time of the irradiation light. With the device, the distance between the vane and the engagement roller can be accurately grasped.

Further, since the optical means is an optical laser device, highly accurate inspection can be performed with an optical means having a simple structure.

Further, the position detecting plate is provided with a plurality of slits in a direction parallel to the opening / closing direction of the landing door and in a direction in which the irradiation light from the optical means is irradiated vertically.
The interval between the vane and the engagement roller is detected by integrating the number of transmissions of the transmitted light transmitted through the gap of the slit as the number of receptions in the optical means. Thus, the distance between the vane and the engagement roller can be accurately grasped.

Furthermore, since the optical means is a photoelectric switch, highly accurate inspection can be performed with an optical means having a simple structure.

[Brief description of the drawings]

FIG. 1 is a side view schematically showing an elevator including an elevator door engagement inspection device according to Embodiment 1 of the present invention.

FIG. 2 is a front view schematically showing a landing door and a car door of the elevator including the elevator door engagement inspection device according to Embodiment 1 of the present invention from the landing side.

FIG. 3 is a diagram schematically showing an upper surface of a left half of FIG. 2 in an enlarged manner from a car side.

FIG. 4 is an enlarged schematic view showing an elevator door engagement inspection device according to Embodiment 1 of the present invention.

FIG. 5 is an enlarged top view showing an essential part of an elevator door engagement inspection device according to Embodiment 2 of the present invention.

FIG. 6 is an enlarged top view showing a main part of an elevator door engagement inspection device according to Embodiment 3 of the present invention.

FIG. 7 is an enlarged perspective view showing a main part of an engagement inspection device for an elevator door according to Embodiment 3 of the present invention.

FIG. 8 is a front view schematically showing a conventional elevator door from a landing side.

FIG. 9 is a top view schematically showing a part of a conventional elevator door.

[Explanation of symbols]

2 hoistway, 6 cars, 7 engaging rollers, 8 vanes,
16, 20, 31 Position detecting plate, 16b groove, 17 Laser device (optical means), 18 Detector (detecting means), 30
Photoelectric switch (optical means), 31b slit.

Claims (6)

[Claims] 1. A car that moves up and down in a hoistway of an elevator, a vane provided on the car door side, and a vane provided on the landing door side, which engages with the vane when opening and closing the car door. An engagement roller that opens and closes the landing door in conjunction with the car door, an optical unit provided on the car, and a position detection plate provided on the landing door and receiving irradiation light from the optical unit. An engagement check of an elevator door, comprising: detecting means for detecting an interval between the vane and the engaging roller at a closed position of the car door and the landing door based on a change in light passing through the position detection plate. apparatus. The position detection plate is a comb-shaped member having a groove provided in a direction perpendicular to an opening and closing direction of the landing door and in a direction in which irradiation light from the optical unit is irradiated vertically. The detecting means integrates the number of the grooves as the number of changes in the required reciprocating time of the irradiation light due to a change in the optical path length according to the depth of the grooves, so that the distance between the vane and the engagement roller is calculated. 2. The method according to claim 1, wherein the detecting is performed.
A device for checking engagement of an elevator door as described in the above. 3. The position detecting plate is a step-shaped member which is perpendicular to the opening / closing direction of the landing door and has a step in a direction in which irradiation light from the optical means irradiates vertically. Detecting an interval between the vane and the engaging roller by integrating the number of changes in the optical path length due to the step as the number of changes in the required reciprocating time of the irradiation light. A device for checking engagement of an elevator door as described in the above. 4. An elevator door engagement inspection device according to claim 2, wherein said optical means is an optical laser device. 5. The position detection plate is provided with a plurality of slits in a direction parallel to an opening / closing direction of the landing door and in a direction in which irradiation light from the optical unit irradiates vertically. 2. The elevator door according to claim 1, wherein the interval between the vane and the engagement roller is detected by integrating the number of times of transmission of the transmitted light passing through the gap of the slit as the number of times of light reception in the optical unit. Engagement inspection device. 6. An elevator door engagement checking device according to claim 5, wherein said optical means is a photoelectric switch.