JPH0541196Y2 - - Google Patents

Description

[Detailed description of the invention] Purpose of the invention (industrial application field) This invention detects an obstacle on the descending path of the slats of an electric shutter and automatically lowers the slats. This invention relates to an obstacle detection device that causes a stop.

(Prior Art) Conventionally, in an electric shutter that is raised and lowered by the driving force of a motor, if the lowering of the slats is blocked by an obstacle on the lowering path, the motor and other lifting devices may be damaged, or the obstacle itself may be damaged. In order to prevent damage to the motor, an obstacle detection device is provided to immediately stop the operation of the motor if the slat comes into contact with an obstacle.

(Problem to be solved by the invention) However, with the above-mentioned obstacle detection device, if the slat is automatically stopped from descending due to an obstacle, and the obstacle is removed, the slat immediately starts descending. Therefore, there was a problem with safety when removing obstacles.

Structure of the invention (means for solving the problems) In order to solve the above problems, this invention operates a motor based on the operation of an operation switch to raise and lower the slats, and at the same time removes obstacles on the slats' lowering path. In an electric shutter that automatically stops motor operation when an obstacle is detected, infrared light is emitted based on the operation of first and second microswitches 10 and 11 that detect an obstacle on the descending path of the slat 4. A transmitting device 22, a receiving device 21 that receives the infrared light and activates relays R1, R2, and R3 to stop the operation of the motor M and activate the warning buzzer 19, and a bottom slat 7 that touches the floor. A third micro switch 9 detects the floor surface when it comes into contact and disables the operation of the first and second micro switches, a reset switch 18 cancels the operation of the relay, and a closing of the slat lowering switch 17. In some cases, the configuration includes a relay R4 for disabling the operation of the reset switch 18.

(Function) When the reset switch 18 is operated after the lowering switch 17 is deactivated by the above means, the warning buzzer 19 stops sounding and the lowering switch 17 is activated again.
The slat 4 can now be lowered by operating the button.

(Embodiment) An embodiment embodying this invention will be described below with reference to the drawings. As shown in FIG. 3, the shutter 1 has guide rails 2 erected on both sides, and the upper end of the guide rail A winding shaft (not shown) rotatably driven by a motor described later is rotatably supported within the storage case 3 connecting the winding shafts, and slats 4 connected vertically in multiple stages are suspended from the winding shaft. As the winding shaft rotates due to the operation of the motor, each slat is moved up and down while being guided by guide rails 2 at both ends thereof.

As shown in FIG. 2, each slat 4 is composed of a hollow body 5 whose lower edge is partially opened over its entire length in the longitudinal direction, and a connecting piece 6 that projects upward from the body 5. A piece 6 is suspended from the main body 5 of the upper slat 4 so as to be retractable. Therefore, each slat 4 is connected so as to be vertically expandable and retractable by the connecting piece 6 extending and retracting from the upper slat. Further, the bottom slat 7 at the lowest level has a short connecting piece 8, and is suspended and supported from the slat 4 at the upper level in a non-expandable manner.

The bottom slat 7, like the slat 4 above it, moves up and down while its both ends are guided by the guide rails 2. A third micro switch 9 is attached to the lower edge of one end of the bottom slat 7 located within the guide rail 2, and is configured to open when the bottom slat 7 comes into contact with the floor surface.

First and second micro-switches 10 and 11 are attached to the slat 4 two steps above the bottom slat 7 in the main body 5 at both ends thereof, and the circuit is closed when the connecting piece of the lower slat 4 comes into contact with the slat 4. It's becoming like that.

On one side of the bottom slat 7 is a transmitting unit 12.
are attached, and the micro switches 9, 10, 1
Based on the operation of step 1, infrared light is emitted. A receiving unit 13 is attached to the magsa part of the storage case 3 above the transmitting unit 12.
Receive the signal from 2.

A control unit 14 is attached near the storage case 3, and a switch box 15 is provided below the control unit 14 near the guide rail 2. The switch box 15 is provided with an up switch 16, a down switch 17, a reset switch 18, and a warning buzzer 19.

Next, the electric circuit that controls this shutter 1 will be explained according to FIG.
A commercial power supply of 100V is supplied between power supply terminals A and B to the control unit 5, and the power is applied to the control unit 14 via a switch box 15. Four relays are provided within the control unit 14. The relay has a normally open contact R1a operated by an excitation coil R1, a normally open contact R2a and a normally closed contact R2b operated by an excitation coil R2, a normally open contact R3a operated by an excitation coil R3, and an excitation coil R4. The normally closed contact R4b is operated by the normally closed contact R4b. Moreover, inside the control unit 14,
Transformer 20 that steps down the 100V commercial power supply to 12V
is provided, and its 12V power supply voltage is supplied to the receiver 13.

The receiving unit 13 contains the transmitting unit 12.
A receiving device 21 and one relay are provided to receive infrared light from. The relay includes an excitation coil R5 that is excited when the receiving device 21 receives infrared light from the transmitting unit 12, and a normally open contact R5 that is closed by the excitation of the excitation coil R5.
It is composed of a.

To explain the connection configuration of each relay and switch as described above, a lift switch 16 and lift drive terminals t1, t3 of a motor M are connected in series between power supply terminals A and B, and the lift switch 16 is closed. Then, the motor M is driven to rotate in the direction of raising the slat. The lowering switch 17 has a contact R2b and a motor M.
are connected in series with the downward drive terminals t2 and t3,
When these are connected between power terminals A and B and the lowering switch 17 and contact R2b are both closed, the motor M is driven to rotate in the direction of lowering the slat. Further, the lowering switch 17 and the excitation coil R4 are connected in series between power terminals A and B, and when the lowering switch 17 is closed, the excitation coil R4 is excited and the normally closed contact R4b is closed. There is.

The reset switch 18 has contacts R4b and R2a.
and excitation coil R3 are connected in series, and when these are connected between power supply terminals A and B, and the reset switch 18 and contacts R4b and R2a are both closed, excitation coil R3 is excited. There is. A contact R5a is connected in series to the excitation coils R1 and R2 connected in parallel, and when these are connected between power terminals A and B and the contact R5a is closed, the excitation coils R1 and R2 are excited and the contact is closed. R1
a, R2a are closed, and contact R4b is opened.

A normally open contact R1 is connected between both terminals of the transformer 20.
a and a warning buzzer 19 are connected in series, and when the contact R1a is closed, the warning buzzer 19 emits a warning sound. The normally open contact R3a is connected to the receiving device 21, and when the excitation coil R3 is excited and the contact R3a is closed, the excitation of the excitation coil R5 is released.

The transmitting unit 12 contains a transmitting device 22 and a dry cell 23 as a power source for the transmitting device 22. The transmitting device 22 is connected in parallel to the first and second micro switches 10,
The first and second microswitches 10, 11 and the third microswitch 9 are connected in series, and the third microswitch 9 is closed and the first and second microswitches 10, 1
When either or both of the first and second terminals are closed, the transmitter 22 emits infrared light.

Next, the operation of the shutter configured as described above will be explained.

Now, when the lift switch 16 of the switch box 15 is pressed in order to pull up the slat 4 and open the shutter, the motor M is activated, the winding shaft is rotated, and the slat 4 is sequentially wound into the storage case 3. When the lift switch 16 is opened after the slat 4 has been pulled up to the desired position, the operation of the motor M is stopped, and the slat 4 is maintained in the pulled up state to the desired position.

On the other hand, when the lowering switch 17 is pressed to lower the slat 4 and close the shutter, contact R
Since the circuit 2b is always closed, the motor M operates to lower the slat 4. In this state, the bottom slat 7 contacts an obstacle and is prevented from descending, so that the connection piece 8 of the upper slat 4 of the bottom slat 7 connects both the first and second microswitches 10 and 11 or When either one is closed, the circuit consisting of the third microswitch 9 and the first and second microswitches 10 and 11 is closed, so that the infrared rays are transmitted from the transmitting device 22 to the receiving device 21. Light is emitted.

Then, in order to receive the infrared light and excite the exciting coil R5, the receiving device 21 opens the normally open contact R5a.
is closed. When the contact R5a is closed,
Since the excitation coils R1 and R2 are excited and the contact R1a is closed, the warning buzzer 19 sounds and at the same time,
Contact R2b is opened to stop the operation of motor M, and contact R2a is closed. Therefore, as soon as the bottom slat 7 comes into contact with an obstacle, a warning sound is emitted and the lowering movement of the slat 4 is stopped.

When the obstacle is removed from this state, the first and second microswitches 10 and 11 are opened, so the transmission of infrared light from the transmitter 22 is stopped, but the receiver 21 continues to operate the excitation coil. Continue to excite R5. Then, when the operation of the lowering switch 17 is released to open the circuit, the excitation of the excitation coil R4 is canceled and the contact R4b is closed. When the reset switch 18 is pressed to close the circuit in this state, the excitation coil R3 is excited and the contact R3a is closed, so the excitation of the excitation coil R5 is released and the contact R
5a is opened, and along with this, the exciting coil R
1. Since the excitation of R2 is released, the contact R1a is opened and the warning buzzer is stopped, the contact R2a is opened and the contact R2b is closed, and the lowering switch 17 is operated to lower the slat 4 again. You will be in a state where you can get it.

Furthermore, when the slats 4 are lowered and the bottom slats 7 contact the floor as described above, the microswitches 9 are first opened, and in this state, each slat 4 is contracted and the first and second microswitches 1
Even if 0 and 11 are closed, the transmitting device 22 does not transmit infrared light. Therefore, bottom slat 7
When the shutter hits the floor, no warning sound is emitted and the operation of the motor M is not stopped, so the shutter can be closed reliably. When the bottom slat 7 comes into contact with an obstacle while descending, either or both of the first and second microswitches 10 and 11 are closed, and infrared light is transmitted from the transmitting device 22 to the receiving device 21. Based on the reception of the infrared light by the receiving device 21, the warning buzzer 19 emits a warning sound and the operation of the motor M is stopped. Therefore, damage to the motor M and other elevating mechanisms due to obstacles can be prevented, and damage to the obstacles themselves can also be prevented.

Further, when the bottom slat 7 comes into contact with the floor surface, the operation of the third micro switch 9 reliably releases the operation of the transmitting device 22. The obstacle detection means is configured to operate the first and second micro switches 10 and 11 by utilizing the expansion and contraction of the two-stage slat 4 suspended above the bottom slat 7. When the bottom slat 7 hits an obstacle, the operation of the motor M can be reliably stopped by operating the first and second micro switches 10 and 11, and when the bottom slat 7 hits the floor, the operation of the motor M can be reliably stopped. can reliably disable the operation of the first and second microswitches 10, 11, and the operation of the third microswitch 9 and the first and second microswitches 10, 1 can be reliably disabled.
1 can be attached extremely easily to the lower edge of the bottom slat 7 and to the main body 5 of the slat 4 located two steps above the bottom slat 7 without requiring attachment precision. Furthermore, since the first and second micro-switches 10 and 11 are provided near both sides of the slat 4, if an obstacle comes into contact with one side of the bottom slat 7, only one side of the bottom slat 7 will prevent the bottom slat from descending. Either of the microswitches will operate reliably even if the state is interrupted.

Effects of the device As detailed above, this device prevents the slat 4 from being lowered immediately even when an obstacle is removed.
By operating the reset switch 18 and the lowering switch 17 after once releasing the lowering switch 17, the slat 4 can be lowered again, which has the excellent effect of allowing extremely safe removal of obstacles. Demonstrate.

[Brief explanation of the drawing]

Fig. 1 is a partially enlarged front view of a shutter showing an embodiment embodying this invention, Fig. 2 is a side view thereof, Fig. 3 is a front view of the shutter, and Fig. 4 is a diagram showing how to drive this shutter. This is an electrical circuit diagram for. Slut...4, Bottom Slut...7, Third Micro Switch...9, First Micro Switch...10, Second Micro Switch...1
1. Lower switch... 17. Reset switch...
...18, Warning buzzer...19, Receiving device...2
1. Transmission device...22. Motor...M. Relay...
...R1, R2, R3, R4.

Claims (1)

[Scope of utility model registration request] In an electric shutter that operates a motor to raise and lower the slats based on the operation of an operating switch, and automatically stops the operation of the motor when an obstacle is detected on the slat's lowering path, an obstacle on the lowering path of the slat 4 is detected. A transmitting device 22 transmits infrared light based on the operation of first and second microswitches 10 and 11 that detect The operation of the warning buzzer 19 is stopped and the warning buzzer 19
a receiving device 21 that operates the bottom slat 7;
a third micro switch 9 that detects the floor surface when it comes into contact with the floor surface and disables the operation of the micro switch; a reset switch 18 that cancels the operation of the relay; and a slat lowering switch 1.
An obstacle detection warning circuit for an electric shutter, comprising a relay R4 that disables the operation of the reset switch 18 when the reset switch 7 is closed.