JPH09317358A - Obstruction sensor for shutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use radio waves for transmitting and receiving the sensing of an obstruction and stably transmit and receive the sensing, and to improve the reliability of control at the time of obstruction sensing further. SOLUTION: When a sensor 6 is brought into contact with an obstruction at the time of the opening and closing of a shutter, the sensor 6 is operated, and a coding circuit 8 for a transmitting means 7 outputs a sensing signal and the sensing signal is transmitted in specified carrier frequency from a modulation circuit 9. The carrier frequency is varied within a specified frequency range during the transmission of the sensing signal by a frequency variable circuit 10. Accordingly, the sensing signal can be received in either varied frequency even when an attenuation point in a certain frequency is generated in a receiving section. The received sensing signal is output to a control panel, and the shutter is controlled so as to be instantaneously opened and closed safely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter obstacle sensing device for sensing contact with an obstacle while the shutter is being opened and closed and outputting a signal to a control device to safely control the shutter curtain.

[0002]

2. Description of the Related Art Shutters installed in stores, banks, factories, etc. are provided with an obstacle sensing device for sensing contact with an obstacle when opening and closing. This is especially provided for shutters that open and close unattended or by remote control.

The obstacle detection device is provided on a seat plate portion on the indoor side at the lower end of the shutter curtain, and a transmitter operated by a switch operated when an obstacle comes into contact with the seat plate, and a transmission unit is provided on the upper shutter case side. The sensing signal is optically transmitted to the section. The sensing signal optically received by the receiving unit sends a stop signal to the shutter control panel to stop the driving of the opening / closing device.

As described above, the sensing signal may be wirelessly transmitted in addition to the optical transmission. The opening and closing of the shutter curtain is generally performed by radio transmission using radio waves using a remote control, but regarding the sensing device, radio transmission using radio waves is not commonly used due to the following reasons.

[0005]

Although it is possible to transmit a sensing signal from this obstacle sensing device using radio waves, the height of the shutter curtain at the time when the obstacle is sensed in the radio wave system. Depending on the position, environmental conditions such as the ceiling, height, and depth in the room, the radio waves may be diffusely reflected and the reflected signals may cancel each other out and be attenuated. This is a radio disturbance due to the local occurrence of attenuation points due to multipath.

For example, in an environmental condition where the interior of the room is sealed with concrete, if an obstacle sensing device is provided inside the room, the transmitter provided on the shutter curtain side that opens and closes and the shutter case fixed on the shutter case side. Due to the positional relationship with the receiver, if this attenuation point occurs at the height position where the shutter curtain is opened and closed, even if an obstacle is detected at this attenuation point, the radio wave of the detection signal on the receiver side The reception cannot be performed properly. in this way,
Although the sensing signal is transmitted by radio waves from the transmitter, the sensing signal may not be detected by the receiver side. The same problem occurs not only indoors but also outdoors where there are many walls and the like.

Further, even if the reliability is improved, it is impossible to provide a transceiver suitable for any environment because the environmental conditions are different depending on the installation location of the shutter. As described above, wireless transmission using radio waves has not been widely used because the reliability of quick shutter curtain stop control, which is required when an obstacle is detected, cannot be improved if there is a radio wave obstacle.

The present invention has been made in order to solve the above-mentioned problems, and wireless radio waves are used for transmitting and receiving the detection of obstacles, which can be performed stably, and the reliability of control at the time of obstacle detection is further improved. An object of the present invention is to provide an obstacle sensing device for a shutter that can be operated.

[0009]

In order to achieve the above object, an obstacle sensing device for a shutter according to the present invention is an obstacle sensing device for a shutter, which senses an obstacle when the shutter curtain is opened and closed and performs corresponding opening / closing control. 3, a sensor 6 provided on the seat plate of the shutter curtain, which operates when an obstacle is detected, and a transmitter 7 that modulates a sensor signal at a predetermined carrier frequency f0 by the operation of the sensor 6 and transmits the signal.
A frequency changing means 10 which is connected to the transmitting means 7 and changes the carrier frequency f0 within a predetermined frequency range ± fs within the transmission period t of the sensing signal.

Further, as described in claim 2, the transmitting means 7 transmits the sensing signal a plurality of times by one operation of the sensing body 6, and the frequency varying means 10 performs the plurality of times. The transmitted sensing signal is given frequency ±
The configuration may be changed within the range of fs.

According to the above construction, the sensor 6 is activated when an obstacle is touched while the shutter is opened or closed. The transmission circuit 7 generates a sensing signal based on the operation of the sensing body 6 to generate a predetermined frequency f.
Send with 0. However, this sensing signal is changed and transmitted within the range of frequency ± fs by the frequency varying means 10 during the transmission. The receiving unit 3 receives the detection signal and outputs it to the control panel 4, and safety control such as opening / closing of the shutter is performed. Depending on the height position when an obstacle is detected while the shutter is open / closed, an attenuation point may occur due to the distance between the sensor and the receiver, the effect of multipath, etc., but the frequency f0 of the detection signal itself is fs only. Since the configuration is variable, it becomes possible to transmit and receive radio waves at any of the varied frequencies, and the sensing signal can be stably transmitted to the receiving unit.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an overall view showing an obstacle sensing device for a shutter according to the present invention. The shutter obstacle sensing device 1 includes a sensor 2, a receiver 3, a control panel 4,
The switch M is generally configured.

Based on the opening / closing operation of the operating portion 5, the control panel 4 drives and controls the opening / closing device M in the corresponding direction to open / close the shutter curtain. When the sensor 2 provided on the seat plate of the shutter curtain senses that an obstacle is touched at the time of opening / closing, a sensing signal is transmitted to the receiving unit 3. The sensor 2 and the receiver 3 wirelessly transmit and receive a sensing signal via the transmitting antenna 2a and the receiving antenna 3a, respectively. The opening / closing device M, the control panel 4, and the receiving unit 3 are provided inside a shutter case in which the shutter curtain is wound and housed. Receiving antenna 3
“a” may be provided not only outside the shutter case but inside the shutter case. The receiving unit 3 receives the sensing signal and outputs it to the control panel 4.

FIG. 2 is a block diagram showing the internal structure of the sensor 2. The sensing body 6 operates when an obstacle comes into contact with the seat plate when the shutter is opened and closed. The sensing body 6 can be constituted by a micro switch, and its contact is closed by a movement when an obstacle comes into contact with a movable seat plate to be in an operating state. In addition, the sensor 6 may be composed of a tape switch or the like.

The transmitting means 7 includes an encoding circuit 8 and a modulation circuit 9.
It consists of. The encoding circuit 8 generates a predetermined code string indicating a sensing signal when the sensor 6 is activated. The modulation circuit 9
The generated sensing signal is modulated at a predetermined frequency and transmitted from the transmitting antenna 2a.

The transmitting means 7 includes a frequency changing means 10
Is connected and the transmission frequency is changed. The frequency changing means 10 is composed of an oscillation circuit 11 and a sweep circuit 12.
The oscillator circuit 11 is composed of an oscillator that oscillates a carrier frequency f0 (for example, 315 MHz) for wireless transmission, and sets the carrier frequency f0 to ± fs based on the sweep signal of the sweep circuit 12.
It is made variable in the frequency range (for example, ± 70 kHz). The sweep frequency ± fs of this sweep signal is
It can be varied using various signals that are widely used, such as waves, but since the period t during which the sensing signal is transmitted and output is several hundred msec,
A sweep signal having a shape suitable for sweeping the fs within the transmission period t is used.

The sensing signal is transmitted from the transmitting antenna 2a with a predetermined output and is received by the receiving antenna 3a of the receiving unit 3. The receiving unit 3 uses the carrier frequency f0 ± fs
It suffices if a tuner is provided which is capable of detecting this sensing signal in synchronization with. That is, when fs is set to about 70 kHz, it is possible to receive using an existing widely used tuner for remote control. The receiving unit 3 can receive even a sensing signal in which the carrier frequency is time-variable by the sweep, and outputs it to the control panel 4 when receiving. The control panel 4 safely controls the opening and closing of the shutter such as stopping and reversing the opening and closing of the shutter when the sensing signal is input.

Next, the operation of the above structure will be described.
By opening and closing the shutter curtain, the height position of the sensor 2 (transmission antenna 2a) provided on the seat plate changes, and the distance to the reception antenna 3a on the shutter case side correspondingly changes. Then, when the shutter curtain contacts an obstacle at a certain height position, the transmitter 2 wirelessly transmits the sensing signal.

At this time, the sensor 2 sets the frequency to f0 ± f
The sensing signal changed in s is transmitted. Then, even when the distance at the time of this contact coincides with the attenuation point at the carrier frequency f0, a certain frequency within the changed fs range can be received by the receiving unit 3. The received sensing signal is output to the control panel 4 and safety control is executed, such as immediately opening and closing the shutter.

As a result, both the transmitting antenna 2a and the receiving antenna 3a are affected by radio wave conditions due to structures such as the ceiling height and depth in the room and the height position of the shutter at the time of obstacle detection at the time of installation. Instead, the sensor 2 can be stably transmitted and received by simply arranging it at an appropriate position when the sensor 2 detects an obstacle.

In the above description, the generation of the attenuation point is described by focusing only on the variation in the distance between the sensor 2 and the receiving antenna 3a. However, the attenuation point has a wall and a structure that affect the wireless transmission / reception by multipath and the like. It also depends on how things are arranged. However, by adopting a configuration in which the sensor 2 side varies the carrier frequency f0 by ± fs as in the above configuration, it is possible to similarly receive these at a certain frequency within the frequency range of ± fs. Become.

Although the sensor 2 having the above-mentioned configuration has described the example in which the sensing signal is transmitted once by the operation of the sensing body 6, since the sensing signal is transmitted in an extremely short time as described above,
The sensor 2 may be configured to transmit the same thing a plurality of times with a certain timing within a predetermined time. For this purpose, the encoding circuit 8 makes a plurality of times based on one operation of the sensor 6,
Output a sensing signal. In this case, the receiving unit 3 can output the sensing signal to the control panel 4 at least once.

In the above embodiment, the configuration in which the carrier frequency is varied during one transmission of the sensing signal has been described, but the sensor 2 is configured to transmit the sensing signal a plurality of times, and the sensing signal is transmitted a plurality of times. The configuration may be such that they are transmitted as different carrier frequencies. For example, the frequency f0 is transmitted in the first transmission, and the frequency f0 + fs is transmitted in the second transmission.
And the frequency f0-fs for the third time.

For such transmission, the encoding circuit 8
Outputs the same sensing signal a plurality of times, and the frequency varying means 10 changes the oscillation frequency by fs and outputs it to the transmitting means 9 each time. Even with such a configuration, since the transmission frequencies are different for a plurality of times, even if an attenuation point occurs between the transmission antenna 2a and the reception antenna 3a at a certain frequency and the reception unit 3 cannot receive it, reception at other frequencies is performed. become able to.

[0025]

According to the first aspect of the present invention, since the transmission frequency of the sensing signal is changed within a predetermined frequency range during the transmission of the sensing signal, the distance between the sensor and the receiving section, Attenuation points are not generated due to the influence of multipath, and the sensing signal transmitted from the sensor can be stably received by the receiving unit, and the corresponding shutter control can be immediately performed. Similarly, even if the sensing signal according to claim 2 is transmitted a plurality of times and the transmission frequency of each time is varied within a predetermined frequency range, the sensing signal is transmitted at any time. Will be able to receive stably. As a result, the shutter configured to transmit the sensing signal wirelessly can be used without being affected by the radio conditions due to structures such as the ceiling height and depth in the room, and the height position of the shutter when an obstacle is detected. Can be installed.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall configuration of a shutter obstacle detection device of the present invention.

FIG. 2 is a block diagram showing an embodiment of the apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Obstacle sensing device, 2 ... Sensor, 2a ... Transmission antenna, 3 ... Reception part, 3a ... Reception antenna, 4 ... Control panel, 5
... operation part, 6 ... sensor, 7 ... transmission means, 8 ... encoding circuit, 9 ... modulation circuit, 10 ... frequency varying means, 11 ... oscillation circuit, 12 ... sweep circuit.

Claims (2)

[Claims] 1. An obstacle sensing device for a shutter, which senses an obstacle when the shutter curtain is opened / closed and performs corresponding opening / closing control, wherein a sensing body is provided on a seat plate of the shutter curtain and is activated when the obstacle is sensed. Transmitting means for modulating and transmitting a sensing signal at a predetermined carrier frequency by the operation of the body; frequency varying means connected to the transmitting means for varying the carrier frequency within a predetermined frequency range within the transmission period of the sensing signal; An obstacle detection device for a shutter, comprising: 2. The transmitting means transmits a plurality of sensing signals by one operation of the sensing body, and the frequency varying means determines the sensing signals transmitted a plurality of times by a predetermined value. The shutter obstacle sensing device according to claim 1, wherein the obstacle sensing device is configured to be changed within a frequency range.