JPH0541195Y2 - - 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 electric shutters that are 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. and,
As an example of such an obstacle detection means,
A safety device described in Publication No. -45356 has been proposed.

(Problem to be solved by the invention) However, in the above-mentioned safety device, an obstacle detector is provided at the lower edge of the slat curtain, which is constructed by connecting multiple slats vertically, and the lower edge of the shutter is There is a need for a floor detection lever that disables the operation of the obstacle detector when it comes into contact with the floor to protrude below the obstacle detector.
There was a problem in that the detection mechanism provided at the lower edge of the slat curtain was complicated.

Structure of the invention (means for solving the problem) In order to solve the above problem, this invention projects a connecting piece upward from the main body of the slat, and connects the connecting piece to the main body of the upper slat in a manner that it can be retracted from the main body of the upper slat. In a shutter in which multiple stages of slats are vertically extendable and retractable and the slats are suspended and supported so that they can be raised and lowered by a winding shaft that is rotationally driven by a motor, a transmitting unit is provided on the bottom slat at the lowest stage of the slats, and A receiving control unit is provided above the transmitting unit to stop the motor when it receives infrared light from the transmitting unit, and a receiving control unit is installed on both sides of the upper slat of the bottom slat based on the insertion of the lower slat connecting pieces of the slat. A third micro switch is provided at the lower edge of one end of the bottom slat to detect the floor surface and disable the operation of the micro switch. It is configured with a switch.

(Function) With the above means, when the bottom slat 7 comes into contact with an obstacle, the operation of the motor M is automatically stopped by the operation of the first and second micro switches 10 and 11, and the micro switch 9 is placed on the floor. When they come into contact, the operation of the microswitches 10 and 11 is disabled.

(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 in the storage case 3 connecting the winding shafts, and slats 4 connected in multiple stages in the vertical direction are suspended from the winding shaft. As the winding shaft rotates due to the operation of the motor, each slat connects both ends to the guide rail 2.
The robot is designed to be raised and lowered while being guided by the robot.

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 6 of the lower slat 4 comes into contact with the slat 4. It is becoming more and more like this.

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 supply 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 raising the slat. Further, the lower switch 17 and the excitation coil R4 are connected in series between power terminals A and B, and when the lower switch 17 is closed, the excitation coil R4 is excited and the normally closed contact R4b is opened. 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 houses a transmitting device 22 and a dry battery 23 as a power source for the transmitting device 22. The transmitting device 22 has first and second microswitches 10 connected in parallel,
11 and a third microswitch 9 are connected in series, and the third microswitch 9 is closed and the first and second microswitches 10, 1 are connected in series.
1 is closed, the transmitting device 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 6 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 19 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. It becomes possible to do so.

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 reliably closed.

As described above, in this shutter, when the bottom slat 7 comes into contact with an obstacle while the slat 4 is descending, either or both of the first and second microswitches 10 and 11 are closed, and the transmitting device 22 is transferred to the receiving device. Infrared light is emitted towards the motor 21, and upon reception of the infrared light by the receiver 21, a 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.

Furthermore, 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. One of the microswitches will operate reliably even if the switch is in a closed state.

Effects of the Invention As described in detail above, this invention is applicable to each of the microswitches 9 and 9 constituting the obstacle detection device that stops the operation of the motor M that raises and lowers the slat 4 only when the bottom slat 7 comes into contact with an obstacle. 10,11
can be attached to the bottom slat 7 and the slat 4 very easily without requiring mounting precision, and the first and second micro switches 1
Since the screws 0 and 11 are attached to both sides of the slat 4, the operation of the motor M can be reliably stopped regardless of the position of the obstacle. Furthermore, since this invention has an extremely simple structure, it exhibits an excellent effect in that malfunctions and failures do not occur.

[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. Slats...4, Main body...5, Connecting pieces...6,
Bottom slat...7, Micro switch...
9, 10, 11, transmitting unit...12, receiving unit...13, control unit...13, motor...M.

Claims (1)

[Claims for Utility Model Registration] 1. Protruding a connecting piece upward from the main body of the slat,
A shutter in which the connecting piece is retractably connected to the main body of the upper slat to connect multiple slats so that they can extend and contract up and down, and the slats are suspended and supported so that they can be raised and lowered by a winding shaft that is rotationally driven by a motor. A transmitting unit 12 is provided on the bottom slat 7 at the lowest stage of the slat, and reception control units 13 and 14 are provided above the transmitting unit to stop the motor M when receiving infrared light from the transmitting unit. First and second microswitches 10 and 11 are provided on both sides of the upper slat 4 of the rat 7, which operate based on retraction of the connecting piece 6 of the lower slat of the slat 7 to transmit infrared light from the transmitting unit. An obstacle detection device for an electric shutter, characterized in that a third micro switch 9 is provided at the lower edge of one end of the bottom slat 7 to detect the floor surface and disable the operation of the micro switch. 2 First and second micro switches 10, 11
The bottom slat 7 connects the slat 4 two steps above.
An obstacle detection device for an electric shutter according to claim 1, characterized in that the device is provided in a utility model.