JPH0539195Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a safety device for an electric shutter that is attached to an opening in a building.

[Problems to be solved by the prior art and the invention] Today, in this type of electric shutter, if there is an obstacle during the lowering operation of the shutter curtain, a detection switch installed on the seat plate detects this. A safety device is provided to emergency stop the lowering of the shutter curtain. However, for example, in cases where the shutter is made up of multiple panel bodies connected by a chain, the shutter curtain is extended even after the seat board has landed, and each panel body (or slat)
If this safety device is used for something that requires sealing a gap between The disadvantage is that the shutter curtain stops lowering when detected, leaving it in a half-open state and not allowing it to be fully closed.

Therefore, some seat plate position detection means such as a micro switch is installed in the area before the seat plate lands, and the input of the detection signal before the seat plate is switched so that it is not considered as obstacle detection. Since the position is adjusted mechanically, the accuracy is poor, and there is a limit to reducing the distance from the floor, making it impossible to detect obstacles just before the seat hits the ground. This has become a problem as there is a danger that, for example, the toe may become pinched.

[Means for solving the problem] In view of the above-mentioned circumstances, the present invention was devised for the purpose of providing a safety device for electric shutters that can eliminate these drawbacks. In an electric shutter that opens and closes the shutter curtain using the driving force of
A plurality of obstacle detection means are arranged in parallel in the left and right direction at the lower end of the shutter curtain, and a detection signal from the obstacle detection means is input to the drive control section of the electric motor, and the first detection An obstacle detection determination unit that determines that an obstacle is detected as abnormal if there is no signal input from at least one of the remaining obstacle detection means within a preset time from when the signal is input. This feature is characterized in that the shutter curtains are connected to each other to perform an emergency stop of the shutter curtain.

With this configuration, the present invention makes it possible to accurately determine whether a landing or an obstacle has been detected.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawing, 1 is a shutter curtain of a panel shutter, and the shutter curtain 1 is constructed by connecting a plurality of panel bodies 2 in a series with a predetermined interval in the vertical direction by a connecting chain 3. The opening/closing machine 5 (electric motor) installed inside the shutter case 4 is driven forward and backward to move up and down to open and close the opening. The lower ends of the succeeding panel bodies 2 are successively brought into contact with each other to seal the gap between the panel bodies 2 and completely close them.

Reference numeral 6 denotes a seat plate connected to the lowermost end of the shutter curtain 1, and the seat plate 6 has a plurality of detecting parts 6a in the left and right direction (four sets in total in the embodiment) that can freely appear and retract downward. It is attached, and there are also 6 seat boards.
Detection switches SW1 to SW4 are provided inside to detect the retracted posture of each of the detection sections 6a, respectively. When the detection unit 6a hits an obstacle or the floor and sinks into the seat plate 6, the detection signals from the detection switches SW1 to SW4 are transmitted to the transmitter 7 provided on the seat plate 6 and the shutter case 4. The signal is input to a control unit 9, which will be described later, via a receiver 8 provided on the side.

Next, obstacle detection control by the control section (obstacle detection/judgment section) 9 will be explained based on FIG. 3.
This obstacle detection control will be performed during the closing operation, but first the detection switches SW1 to SW4 are
It is determined whether any of them is in the ON state. This judgment is made continuously, but if it is judged as YES, a timer is set for a set time T, which will be described later, and it is further checked whether all detection switches SW1 to SW4 are turned ON before the set time T elapses. Deciding. If all the remaining detection switches SW1 to SW4 are turned on within the set time,
It is determined that the seat board 6 has landed on the floor, but if any of the detection switches SW1 to SW4 remains OFF and the set time T has elapsed, it is determined that the seat board 6 has touched an obstacle. When this is determined, the driving of the switch 5 is stopped urgently via the opening/closing control circuit (drive control section) 11, and at the same time, the alarm means 12 issues an alarm.

Here, the set time T is determined as follows. That is, it is assumed that the detection switches SW1 to SW4 are turned on at the same time when the seat plate 6 lands on the ground, and that the lowering speed of the shutter curtain 1 is V. Then, if the minimum dangerous height of the seat board 6 (for example, 20 mm) that is expected to occur when the seat board 6 lands is H, the shutter curtain 1 will be lowered by H. The time t required for this is t=H/V. Therefore, the set time T is set to a value equal to or smaller than this time t (T≦t). Moreover, when the seat plate 6 lands, the detection switch is activated.
SW1 to SW4 are not turned on at the same time, and during time _T1
In the case of ON, the set time T needs to be set longer than the time T ₁ (T>T ₁ ) in consideration of the error time t ₂ as well as the above conditions.
Also, if the floor surface is sloped, time T ₁
may be longer than the above-mentioned time t, but in such a case, in what order should the detection switches SW1 to SW4 be turned on when lowered under normal conditions?
Moreover, the time difference at that time is set in advance (this setting can be done, for example, by switching the control unit 9 to the registration mode during inspection and maintenance, landing on the ground, and registering this as a normal state). ), at the time of landing, if the order of turning on detection switches SW1 to SW4 is out of order, or if detection switches SW1 to SW4 are turned on within a predetermined time,
If there is an abnormality such as the ON operation not continuing, this can be detected as an obstacle.

Note that 12 is a mode changeover switch for switching the control section 9 from the normal control mode to the registration mode, and 13 is a memory in which the set time T is stored. Further, 14 and 15 are limit switches for detecting whether the shutter curtain 1 is fully open or fully closed.

In the embodiment of the present invention constructed as described above, if there is no obstacle that obstructs the lowering operation of the shutter curtain 1, when the seat plate 6 lands on the floor, all the shutters will move as shown in FIG. 4A. Detection switches SW1 to SW4 are in the ON state within the set time T,
The opening/closing machine 5 is continuously driven until the full-close limit switch 15 is detected and activated. Furthermore, if there is a large obstruction in the opening, one of the detection spindles SW1 to SW4 will detect it as shown in FIG. Since SW1 to SW4 are not turned on, the drive of the switch 5 is stopped.
Furthermore, as shown in Figure 4C, if there is a small obstacle such as a toe, the detection switch is activated.
One of SW1 to SW4 is ON within the set time T
Since this condition does not occur, the drive of the opening/closing machine 5 is stopped.

As described above, in the present invention, although the obstacle detection means is provided at the lower end of the shutter curtain of the panel shutter, the detection switches SW1 to SW4 installed in parallel on the seat plate 6 are all activated within the set time. By determining whether it is in the ON state, it is possible to accurately and reliably determine whether it is landing or obstacle detection based on temporal judgment. Therefore, compared to conventional mechanical means, it is not only possible to detect obstacles with extremely high precision, but also to reduce the inoperable area for obstacle detection, and to reliably detect small obstacles such as toes. Therefore, human danger and damage to the shutter can be reliably prevented, and safety can be greatly improved.

It should be noted that the present invention is not limited to the above-mentioned embodiment. For example, as shown in FIG. Even if the control is carried out to raise the height by a predetermined height, the same effect as in the embodiment described above can be obtained.

[Operations and Effects] In summary, since the present invention is constructed as described above, the obstacle detection when the shutter curtain is lowered starts from the time when the first detection signal from any obstacle detection means is input. This is performed when there is no signal input from at least one of the remaining obstacle detection means until the set time.

Therefore, obstacle detection can be performed with high accuracy based on electrical time differences even immediately before landing, and the non-detection area can be significantly reduced compared to conventional mechanical methods. Even small obstacles such as toes can be detected, and human danger can be reliably prevented, and there is no risk of damage to the shutter curtain due to continued lowering operation with a small obstacle caught in between. , it can be made extremely safe.

In addition, this safety device is designed such that the shutter is made up of a plurality of panel bodies connected at predetermined intervals, and even after the seat plate lands, the shutter curtain is extended to seal the gap between each panel body. Even when used for something that requires it, the detection switch can accurately determine whether the operation is due to landing or detecting an obstacle, so the shutter curtain will stop in a half-open state when it detects landing. It is extremely convenient because it can be completely closed without any problems.

[Brief explanation of the drawing]

The drawings show an embodiment of the safety device for an electric shutter according to the present invention, in which FIG. 1 is an overall schematic perspective view of a panel shutter, FIG. 2 is a block diagram of the safety device, and FIG. FIG. 4 is a flowchart showing the procedure of obstacle detection control, FIGS. 4A, B, and C are explanatory diagrams of the same operation, and FIG. 5 is a flowchart showing another embodiment. In the figure, 1 is a shutter curtain, 5 is an opening/closing machine (electric motor), 6 is a seat plate, 6a is a detection section, 9 is a control section, and SW1-4 are detection switches.

Claims (1)

[Scope of utility model registration request] In an electric shutter that opens and closes a shutter curtain using the driving force of an electric motor, a plurality of obstacle detection means are arranged in parallel in the left and right direction at the lower end of the shutter curtain, and a drive control section of the electric motor is provided with a plurality of obstacle detection means arranged in parallel in the left and right direction. , when the detection signal from the obstacle detection means is input and there is no signal input from at least one of the remaining obstacle detection means within a preset time from when the first detection signal is input. 1. A safety device for an electric shutter, characterized in that the obstacle detection/judgment section that detects and judges the obstacle as abnormal is connected to perform an emergency stop of the shutter curtain.