JP3237257B2 - Automatic door position detection device - 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 the position of an automatic door in an automatic opening / closing door system installed at an entrance of a building or a vehicle.

[0002]

2. Description of the Related Art In an automatic door, a door is always closed, and when a door passing object, for example, a person or an object approaches the door, the door is quickly detected and the door is opened, and the door passing object passes through the door. The door is configured to close as soon as possible. For this purpose, a control device is provided which detects when a person or an object approaches or passes through the door, and opens or closes the door accordingly. The control device must open and close the door in a timely manner. At this time, the opening and closing of the door, particularly the opening, is performed at a certain speed. However, if the opening or closing speed of the door is too high, there is a problem that the door strongly hits the door frame and the door or the door frame is broken at an early stage. For this reason, the door opens or closes as quickly as possible, but it is desirable that the door move as slowly as possible at the end of the opening or closing stroke, that is, at the moment when the door hits the door frame. In order to control the movement speed of the door, a position detecting device for detecting the position of the door is required.

FIG. 5 is a schematic view of a conventional door structure provided with such an automatic door position detecting device. The door frame 2 has a closed part 2A (almost half of the door frame 2) which is always closed. (A dashed line hatched portion) and an opening 2B which is opened when the door is fully opened.
(Width dimension M) is fitted. In this case, the width M of the door 1 is slightly larger than １ ／ of the width of the door frame 2, that is, M = １ ／ · L + α. On the upper side of the door 1, a comb-shaped light shielding plate 3 whose length is equal to the width dimension M of the door 1
A position detection sensor 4 including a light-emitting unit 4A and a light-receiving unit 4B is fixed to the door frame 2 at the center of the width of the frame 2 across the front and rear surfaces of the light-shielding plate 3. In FIG. 5, the light-emitting portion 4A and the light-receiving portion 4B of the position detection sensor 4 are drawn vertically relative to each other, but the actual position is as shown in the cross section of the door 1 shown in FIG. At the position sandwiching the front and rear surfaces. This position detection sensor 4
Are formed as linear encoders. With the movement of the door 1, the comb-shaped light-shielding plate 3 also moves, and at that time, the light emitting portion 4A
Until the door is completely closed, light passing through the gap between the comb teeth of the comb-shaped light-shielding plate 3 and the light-shielding portion alternately, and the position detection sensor 4 outputs signals A and B as shown in FIG. Output.
By counting these signals A and B, the position of the door 1 can be detected.

[0004]

In the automatic door position detecting device described above, even when the door 1 is completely opened (the state shown in FIG. 5), it is completely closed (the door 1 moves rightward in FIG. 5). Then, even if the right side of the door 1 is in contact with the right end face of the door frame), the position of the door 1 can be detected.
The length of the light shielding plate 3 is equal to the width dimension M of the door 1, that is, M = １ ／ · L + α with respect to the width dimension L of the door frame 2.
(Α is the effective width of the position detection sensor 4), and the position detection sensor 4 is installed at substantially the center of the width of the door frame 2. That is, in this case, when the door is completely opened, the front end of the light shielding plate 3 is at the position of the position detection sensor 4, and when the door is completely closed, the rear end of the light shielding plate 3 is at the position of the position detection sensor 4. Therefore, the position detection sensor 4 can output a signal over the entire stroke of the door from the fully opened state to the completely closed state.

However, in this case, there are the following problems. That is, the door 1 and therefore the light-shielding plate 3 also move over the entire stroke from the right side to the left side of the door frame 2 when the door 1 is opened and closed. On the other hand, a control device 5 in the automatic opening / closing door equipment is usually mounted on the upper part of the door frame 2. Since the control device 5 cannot be installed in the movement path of the light-shielding plate 3, it is installed above the light-shielding plate 3 or installed behind the light-shielding plate 3. Actually, since the depth dimension (about 10 cm) of the storage space of the door frame 2 is small, the control device 5 is installed in the door frame 2 above the position avoiding the moving space of the light shielding plate 3. Therefore, the size of the door frame 2 itself is increased, and the size of the automatic opening / closing door equipment is also increased.

[0006] In view of the above problems, an object of the present invention is to provide
An object of the present invention is to provide an automatic door position detecting device that can install a control device at a position above a door frame and at the height of a light shielding plate without increasing the size of the entire door.

[0007]

According to the present invention, there is provided an automatic door position detecting apparatus comprising: a light-shielding plate attached to an upper side of a door; and a light-emitting unit disposed to face the light-shielding plate in the front-rear direction. A position detection sensor comprising a light receiving unit,
The light-shielding plate is a comb-shaped light-shielding plate having a length shorter than the width of the door, and the tip thereof is located at least by the width of the position detection sensor from the end surface of the door, and at least two position detection sensors are provided. Provided above, the interval between adjacent position detection sensors is shorter than at least the length of the light shielding plate,
The distance between the position detection sensor at the forefront of the door closing direction and the end face of the door frame contacting the door when the door is completely closed is greater than the distance between the end face of the door frame and the end face of the light-shielding plate, and The distance between the position detection sensor at the tip and the end face of the door frame with which the door contacts when the door is completely open is set to be larger than the distance between the end face of the door frame and the end face of the light shielding plate. In this case, instead of the light-shielding plate, the N-pole and the S-pole may be alternately magnetized and a magnetic tape may be used, and a position detection sensor composed of a magnetic sensor may be used in place of the position detection sensor composed of the light emitting portion and the light receiving portion. .

The automatic door position detecting apparatus according to the present invention includes a synthesizing circuit for synthesizing corresponding output signals of a plurality of position detecting sensors. When a light shielding plate is used, each position detecting sensor has its light emitting portion. Is a logical level of 1 or 0 when the light passes through or is blocked by the light-shielding plate, and is out of phase by 1/4 of the comb tooth pitch of the light-shielding plate.
When a magnetic tape is used, each position detection sensor detects two signals whose phases are shifted by half the magnetic pole pitch of the magnetic tape, and correspondingly outputs a two-phase logical signal. Is output. Further, in the automatic door position detecting device, the synthesizing circuit synthesizes the corresponding output signals of the position detecting sensors by using a logical sum circuit or a logical product circuit.

[0009]

According to the structure of the present invention, the light-shielding plate or the magnetic tape is made shorter than the width of the door, and the front end thereof is located at least by the width of the position detecting sensor from the end face of the door. There is space at the top of the door for the minute. Therefore, the control device can be arranged in this space when the door is completely closed, so that it is not necessary to make the whole door large. Further, at least two or more position detection sensors are provided, and an interval between adjacent position detection sensors is set to be shorter than at least the length of the light shielding plate or the magnetic tape. In this case, if a light-shielding plate or a magnetic tape overlaps with one position detection sensor, the light-shielding plate or the magnetic tape always comes to a position where it overlaps with a position detection sensor next to it before leaving the position detection sensor. Therefore, the signal output from the position detection sensor is not lost. However, this is only realized under the condition that a light-shielding plate or a magnetic tape overlaps one position detection sensor. In the present invention, therefore, the distance between the position detection sensor at the forefront of the door closing direction and the end face of the door frame contacting the door in the fully closed state of the door is the distance between the end face of the door frame and the end face of the light shielding plate or the magnetic tape. The distance between the position detection sensor, which is larger than the distance and the front end of the door in the opening direction of the door, and the end surface of the door frame with which the door contacts when the door is fully opened is the distance between the end surface of the door frame and the end surface of the light shielding plate or the magnetic tape. Set larger. Therefore, in this case, when the door is completely closed, the position detection sensor at the front end of the door in the closing direction overlaps with the light shielding plate or the magnetic tape, and when the door is completely open, it is at the front end of the door in the opening direction. Since the position detection sensor and the light shielding plate or the magnetic tape overlap, any one of the position detection sensors surely overlaps with the light shielding plate or the magnetic tape, and there is no signal loss. That is, the position of the door can be reliably detected.

[0010]

FIG. 1 shows an embodiment of the present invention in which two position detecting sensors are provided.
FIG. 5 is a schematic view of a door device in the case where a plurality of door devices are used. Here, those denoted by the same reference numerals as those in FIG. Reference numerals 4-1 and 4-2 denote position detection sensors having the same function as reference numeral 4 in FIG. In FIG. 1, the center of the first position detection sensor 4-1 is a = 1/4 from the left side of the door frame 2.
A second position detection sensor 4 at a position where L + α
2 is b = 1/4 from the center of the first position detection sensor 4-1.
-It is installed at a position separated by L and at an integral multiple of the comb tooth pitch. The light-shielding plate 3 has a length of 1 /
It is set to be larger than 4 · L + α and smaller than 1/2 · L, and is fixed to the door 1 with its left end aligned with the left end of the upper side of the door 1. With such a configuration, the first position detection sensor 4-1 uses the first position detection sensor 4-1 until the door 1 moves rightward by about １ ／ · L from the state of FIG. 1 (FIG. 2) (see FIG. 2). In FIG. 2), the first position detection sensor 1 and the second position detection sensor 4-2, and when the door 1 moves further rightward from this position (FIG. 3), the second position detection sensor 4- At 2, the position of the door 1 is detected. In this case, since the light shielding plate 3 has a longitudinal dimension shorter than the width dimension M of the door 1 and a left end thereof is aligned with a left end of the door, a space is formed above the door. Therefore, even if the door is completely closed, the light blocking plate 3 does not reach the door frame. This portion can be used as a place where the control device 5 is installed.

FIG. 4 shows the first position detecting sensor 4-1 and the second position detecting sensor 4-1.
3 shows an example of a circuit for continuously synthesizing a position detection signal from the position detection sensor 4-2. The outputs of the first position detection sensor 4-1 are indicated by A1 and B1, the outputs of the second position detection sensor 4-2 are A2 and B2, and the combined outputs are A0 (OR) and B0 (O
R) or A0 (AND), B0 (AND). FIG. 4A shows a configuration of the first position detection sensor 4-4.
1. This is applied when the output of the second position detection sensor 4-2 is an open collector output. In this case A
It is only necessary to short-circuit the 1 output line and the A2 output line or the B1 output line and the B2 output line. Generally, FIG. 4 (B) or FIG.
As in (C), a position detection output can be easily obtained by using an OR circuit or an AND circuit.

In this embodiment, the number of the position detecting sensors is set to two, the mounting positions of these position detecting sensors are limited, and the size and position of the light shielding plate are also limited. However, the present invention is not limited to these. However, the present invention is not limited to this. The number of position detection sensors may be three or more as long as the position detection sensors are placed at positions that are integral multiples of the comb tooth pitch of the light shielding plate. Further, the length of the light-shielding plate and the mounting position of the position detection sensor may be arranged so that the comb teeth of the light-shielding plate overlap with at least one of the position detection sensors in a front-to-back relationship regardless of the position of the door. . Further, in the present embodiment, the position detection sensor is described as an optical type, but the same configuration can be applied when a magnetic type position detection sensor is used. In this case, a magnetic tape in which N and S poles are alternately magnetized is used instead of the light shielding plate 3, and a magnetic sensor is used instead of the light source 4A and the light receiver 4B.

[0013]

According to the present invention, by installing a plurality of position detecting sensors, the light shielding plate can be made shorter than the door width. If one end of this light shielding plate is set back from the right end of the upper side of the door by at least the width of the control device, it can be mounted. The control device can be installed in the empty space generated when the door is closed, and the automatic opening and closing door equipment can be downsized.

[Brief description of the drawings]

FIG. 1 is a schematic view of a door device provided with a door position detecting device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a state in which the door has moved rightward in FIG. 1 and has come to approximately the center of the door frame width;

FIG. 3 is a schematic diagram when the door is further moved rightward in FIG. 2 and the door is fully closed;

FIG. 4 is a connection diagram of output lines from a position detection sensor.

FIG. 5 is a schematic view of a door device provided with a conventional door position detecting device.

FIG. 6 is a sectional view showing the positional relationship between the door and the position detection sensor shown in FIG. 6;

FIG. 7 is an output signal diagram from a position detection sensor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Door 2 Door frame 3 Shield plate 4-1 Position detection sensor 4-2 Position detection sensor 5 Control device

Claims (7)

(57) [Claims] 1. A light-shielding plate attached to an upper side of a door, and a position detecting sensor comprising a light-emitting unit and a light-receiving unit disposed opposite to each other with the light-shielding plate sandwiched in a front-rear direction, wherein the light-shielding plate is provided. It is a comb-shaped light shielding plate with a length shorter than the width of the door,
The front end is located at least by the width of the position detection sensor from the end surface of the door, and at least two or more position detection sensors are provided, and the interval between adjacent position detection sensors is shorter than at least the length of the light shielding plate. Thus, the distance between the position detection sensor at the forefront of the door closing direction and the end face of the door frame that the door contacts in the fully closed state is greater than the distance between the end face of the door frame and the end face of the light shielding plate, and the door is opened. The distance between the position detection sensor at the front end in the direction and the end face of the door frame with which the door contacts when the door is completely open is set to be larger than the distance between the end face of the door frame and the end face of the light shielding plate. Automatic door position detection device. 2. A magnetic tape according to claim 1, wherein the magnetic tape is alternately magnetized with N poles and S poles instead of the light shielding plate, and the magnetic tape is replaced with a magnetic sensor instead of the position detection sensor comprising the light emitting portion and the light receiving portion. An automatic door position detecting device characterized by using a position detecting sensor. 3. A position detecting sensor according to claim 1, further comprising a synthesizing circuit for synthesizing corresponding output signals of the plurality of position detecting sensors. Automatic door position detection device. 4. The automatic door according to claim 2, further comprising a synthesizing circuit for synthesizing corresponding output signals of the plurality of position detection sensors. Position detection device. 5. The light-shielding plate according to claim 1, wherein each of the position detection sensors has a logic level of 1 or 0 when the light of the light-emitting portion passes through or is blocked by the light-shielding plate. 2 out of phase by 1/4 of the tooth pitch
An automatic door position detection device that outputs two signals. 6. A position detecting sensor according to claim 2, wherein each position detecting sensor detects two signals whose phases are shifted by a half of the magnetic pole pitch of the magnetic tape, and correspondingly outputs a two-phase logical signal. An automatic door position detecting device for outputting a signal. 7. The automatic door position detecting device according to claim 1, wherein the synthesizing circuit synthesizes corresponding output signals of the position detecting sensors by an OR circuit or an AND circuit. .