JP2008291546A - Dive stop device in electric shutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dive stop device in an electric shutter capable of stopping the fall of a shutter curtain speedily by using a brake having a small capacity. <P>SOLUTION: This dive stop device in the electric shutter is provided with a winding drum 3 for the shutter curtain 1 rotated and driven by an opening and closing machine 4, a first detection means for detecting the rotational speed of the opening and closing machine 4, a second detection means for detecting the rotational speed of a driven shaft of the winding drum 3, a means for comparing the rotational speed detected by the first detection means with the rotational speed detected by the second detection means and determining the synchronization of the rotation of the opening and closing machine with the rotation of the driven shaft of the winding drum 3 or the non-synchronization of them, and a driven side brake means 13 for stopping the rotation of a winding body when the rotation of the opening and closing machine is asynchronous with the rotation of the driven shaft. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a sudden descent stop device for an electric shutter.

If the drive part (including roller chain or gear) is damaged when opening or closing the building opening with an electric shutter, the shutter curtain may drop suddenly due to its own weight. The descent needs to be stopped.

In the conventional sudden descent stop device, when the shutter curtain is in a sudden descent state due to damage to the drive unit, the number of rotations of the winding body increases. Therefore, by measuring the rotation speed (driven side speed) of the winding body, When the rotation speed of the body reaches a predetermined speed set in advance, the brake is operated in the sudden descent stop device to stop the descent of the shutter curtain urgently. A similar sudden descent stop device is disclosed in Patent Document 1.

However, in the conventional sudden descent stop device, when the rotating speed of the winding body reaches a predetermined speed, that is, when the falling speed of the shutter curtain becomes a high speed state, the falling shutter curtain is stopped urgently, The load of the brake built into the sudden descent stop device becomes large, and it is necessary to use an expensive brake with a large capacity to immediately stop the falling shutter curtain. On the other hand, a brake with a small capacity slips. Even if the brake is operated, the falling shutter curtain may not stop immediately.
JP-A-8-93365

It is an object of the present invention to provide a sudden descent stop device for an electric shutter that can quickly stop a shutter curtain that falls using a brake having a small capacity.

The technical means employed by the present invention in order to achieve the above-described objects are: a shutter curtain winding body that is rotationally driven by the driving means; a first detection means that detects the rotational speed of the driving means; and the winding body. The second detection means for detecting the rotation speed of the drive means, the rotation speed detected by the first detection means and the rotation speed detected by the second detection means are compared, and the rotation of the driving means and the rotation of the winding body are compared. An electric shutter comprising: a means for determining synchronization / asynchronization with the motor; and a driven brake means for stopping the rotation of the winding body when the rotation of the driving means and the rotation of the winding body are asynchronous. A sudden descent stop device.

In one aspect, the winding body includes a drive shaft on one end side and a driven shaft on the other end side, and the first detection means detects the rotation speed of the drive shaft as the rotation speed of the drive means. The second detecting means detects the rotational speed of the driven shaft as the rotational speed of the winding body. The driven brake means stops the rotation of the winding body by stopping the rotation of the driven shaft. In a more specific mode example, a driving means (opening / closing machine) is built in one end side of the winding body, and the first detection means is a driving shaft of the driving means (motor shaft of the opening / closing machine). The rotational speed is detected as the rotational speed of the driving means. Further, in a more specific mode example, a sudden descent stop mechanism provided with driven brake means for stopping the rotation of the winding body is provided on the other end side of the winding body, and the second detection means is The rotational speed of the driven shaft is detected as the rotational speed of the winding body. Further, the driving means is not limited to the winding body built-in type, and rotation of a rotating shaft (for example, a motor rotating shaft of the opening / closing machine) of driving means (opening / closing machine) separately provided outside the winding body. The speed may be detected as the rotational speed of the driving means.

In the present invention, since abnormality is determined based on the synchronous speed / non-synchronization of the rotational speed of the driving means and the rotational speed of the winder, the rotational speed of the winder is equal to or higher than a predetermined speed (that is, the shutter curtain has a normal lowering speed). The shutter curtain can be prevented from falling at an early stage by detecting an anomaly before it is accelerated and lowered. In addition, since the driven brake means is operated at a stage where the rotational speed of the winding body is low, the load applied to the driven brake means is small, the static friction torque required for the driven brake means can be suppressed, and the cost can be reduced. Can be planned. Since the driven brake means is operated at a stage where the rotational speed of the winding body is low, the braking distance and the braking time until the shutter curtain is stopped can be shortened, and the safety is improved. Further, according to the second aspect of the present invention, since the rotational speeds of the drive shaft and the driven shaft respectively provided at both ends of the winding body are directly detected, the detection accuracy is good, and the driven brake is the rotation of the driven shaft. Is stopped directly, so that the rotation of the winding body can be stopped more quickly.

The electric shutter device includes a shutter curtain 1, guide rails 2 that guide both ends in the width direction of the shutter curtain 1, a winding drum 3 that winds up the shutter curtain 1, and a winding drum 3 that rotates and winds the shutter curtain 1. And an opening / closing machine 4 that opens and closes the opening portion. The electric shutter device further includes a control unit that performs opening / closing control of the shutter curtain 1 and an operation unit that gives a predetermined command to the control unit, and the operation unit typically raises and stops the shutter curtain 1. The switch box is provided with three switches U, S, and D for commanding the lowering operation.

In order to open the shutter curtain 1 in the closed state during a normal opening / closing operation, an upward signal is output to the opening / closing device 4 via the control unit by turning on the raising switch U of the switch box. And the rotation of the motor rotation shaft is transmitted to the winding drum 3, and the motor rotation shaft and the winding drum 3 are rotated in synchronization with each other. The shutter curtain 1 is raised. In order to close the shutter curtain 1 in the open state, when the lowering switch D of the switch box is turned on, a lowering signal is output to the opening / closing machine 4 via the control unit, and the motor rotating shaft of the opening / closing machine 4 is connected to the winding drum. 3 rotates the shutter curtain 1 in the feeding direction, the rotation of the motor rotation shaft is transmitted to the winding drum 3, and the motor rotation shaft and the winding drum 3 rotate in synchronization to lower the shutter curtain 1. Further, when the shutter curtain 1 is raised and lowered, the raising and lowering of the shutter curtain 1 is stopped by turning on the stop switch S of the switch box.

As shown in FIGS. 2 and 3, a switch 4 is built in one end side (drive side) of the winding drum 3, and the rotation of the rotating shaft of the motor 5 of the switch 4 is transmitted to the winding drum 3. Thus, the winding drum 3 is rotationally driven by the opening / closing machine 4. That is, the rotating shaft of the motor 5 constitutes the driving shaft of the winding drum 3. More specifically, the rotation of the motor rotation shaft is taken out as rotation of the output shaft 7 through the reduction unit 6 at a reduction ratio of 25: 1. The output shaft 7 and the winding drum 3 are fixed by connecting means 8, and the winding drum 3 rotates integrally with the output shaft 7. Further, the opening / closing machine 4 of the present invention is not limited to the type with a built-in winding body, but an opening / closing machine is provided outside the winding drum 3 to wind the rotation of the opening / closing machine via a transmission means such as a chain or a belt. It may be transmitted to the body.

The motor 5 of the opening / closing machine 4 incorporates first detection means for detecting the rotational speed of the motor rotation shaft. The rotational speed information of the motor rotation shaft detected by the first detection means is transmitted to the control unit. In one preferred form, the first detection means is a position sensor provided with a Hall element. It will be readily understood by those skilled in the art that other position sensors such as an encoder can be employed as the first detection means.

A sudden descent stop mechanism 9 is built in the other end side (driven side) of the winding drum 3. The sudden descent stop mechanism 9 includes a first driven shaft 10, a speed increasing portion 11, a second driven shaft, and second detection means. 12 and a non-excitation brake 13 are provided. The speed increasing portion 11, the second driven shaft, the second detection means 12, and the non-excitation brake 13 are built in the casing 90, and the first driven shaft 10 protrudes from the casing 90 and is wound via the connecting means 14. It is fixed to the drum 3 and rotates integrally with the winding drum 3. The rotation transmitted from the winding drum 3 to the first driven shaft 10 via the connecting means 14 is accelerated by the speed increasing portion (speed increasing ratio 1:25 in this embodiment) 11 and transmitted to the second driven shaft. The The second detection means 12 detects the rotational speed of the second driven shaft. The rotational speed information of the second driven shaft detected by the second detection means 12 is transmitted to the control unit. In one preferred form, the second detection means is a position sensor provided with a Hall element. It will be readily understood by those skilled in the art that other position sensors such as an encoder can be employed as the second detection means.

The opening / closing machine 4 and the sudden descent stop mechanism 9 built in each end of the winding drum 3 are supported by brackets 15 and 16, respectively. The motor 5 and the first detection means wiring 17, the non-excitation brake means 13 and the second detection means 12 wiring 18 are drawn from the switch 4 and the sudden descent stop mechanism 9 and extend along the brackets 15 and 16, respectively. And is electrically connected to the control unit.

The control unit compares the rotational speed (driving side speed) of the motor shaft of the switch 4 detected by the first detecting means with the rotational speed (driven side speed) of the second driven shaft detected by the second detecting means. And means for determining whether or not the rotation of the driving means of the winding drum 3 and the rotation of the winding drum 3 are synchronized. In the embodiment, the rotation ratio of the motor rotation shaft that looks at the rotation speed of the driving means of the winding drum 3 and the second driven shaft that looks at the rotation speed of the winding drum 3 is 1: 1, and the rotation speeds can be compared as they are. . However, the rotation ratio between the rotation of the driving means of the winding drum 3 and the rotation of the winding drum 3 is not necessarily 1: 1. In that case, the determination means determines whether the rotation speed of the driving means of the winding drum 3 and the rotation speed of the winding drum 3 are the same after converting the speed ratio. It is determined whether or not the ratio between the rotational speed of the driving means and the rotational speed of the winding drum 3 maintains a certain ratio. Further, the rotation speed of the winding drum 3 is not necessarily limited to that seen by the rotation of the second driven shaft of the sudden descent stop mechanism 9. For example, the rotation speed of the winding drum 3 is connected to the connecting means 14 that connects the first driven shaft 10 and the winding drum 3. Two detection means may be mounted.

In the control unit, when the rotation speed of the driving means of the winding drum 3 and the rotation speed of the winding drum 3 are different, or when a constant ratio is not maintained, the rotation of the driving means of the winding drum 3 and the winding drum. 3, the control unit determines that the non-excited brake 13 is in a non-energized state and operates the non-excited brake 13, and the second driven of the sudden descent stop mechanism 9 on the driven side of the winding drum 3. Stop the rotation of the shaft. When the rotation of the second driven shaft is stopped, the rotation of the winding drum 3 is stopped via the first driven shaft 10 and the connecting means 14, and the descent of the shutter curtain 1 is stopped.

In the sudden descent stop device for the electric shutter configured in this way, when the shutter curtain 1 is lowered or raised, the rotation of the motor shaft of the switch 4 and the rotation of the driven shaft of the sudden descent stop mechanism 9 are synchronized. Is determined to be in a normal state, and the raising / lowering operation is performed as it is. If an abnormality occurs in the driving means of the winding drum 3 during ascent and descent, the rotation of the driving means of the winding drum 3 is not synchronized with the rotation of the motor shaft of the switch 4 and the rotation of the driven shaft of the sudden descent stop mechanism 9. By detecting the asynchronism between the speed and the rotational speed of the winding drum 3, the non-excitation brake 13 is operated to stop the rotation of the driven shaft of the sudden descent stop mechanism 9 on the driven side of the winding drum 3. An error display may be performed. The error display is displayed on, for example, a switch box. In the present invention, since abnormality is determined based on the rotation speed of the driving means of the winding drum 3 and the synchronization / asynchronization of the rotation speed of the winding drum 3, the rotation speed of the winding drum 3 is equal to or higher than a predetermined speed (that is, the shutter curtain is It is possible to prevent the shutter curtain 1 from falling at an early stage by detecting an abnormality before the vehicle descends at a speed higher than the normal lowering speed. Further, since the non-excitation brake 13 is operated at a stage where the rotational speed of the winding drum 3 is low, the load applied to the non-excitation brake 13 is small, the static friction torque required for the non-excitation brake 13 can be suppressed, and the cost can be reduced. Can be planned.

INDUSTRIAL APPLICABILITY The present invention can be used as an abrupt descent stop device when a drive unit is damaged in an electric shutter.

It is a whole schematic front view and side view of an electric shutter. It is a front view of the upper part of a shutter device. It is a figure similar to FIG. 2, Comprising: It is a front view of only a winding body. It is a figure which shows a sudden descent stop mechanism. It is a block diagram explaining the sudden descent stop device concerning the present invention. It is a flowchart explaining the sudden descent stop apparatus based on this invention. It is a flowchart explaining the conventional sudden descent stop apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shutter curtain 3 Winding drum 4 Opening / closing machine 5 Motor 7 Output shaft 8 Connection means 9 Sudden descent stop mechanism 10 1st driven shaft 13 Non-excitation brake

Claims (2)

A winding body of a shutter curtain that is rotationally driven by a driving means;
First detecting means for detecting the rotational speed of the driving means;
Second detection means for detecting the rotational speed of the winding body;
Means for comparing the rotation speed detected by the first detection means and the rotation speed detected by the second detection means to determine the synchronization / asynchronization between the rotation of the drive means and the rotation of the winding body;
When the rotation of the driving means and the rotation of the winding body are asynchronous, driven brake means for stopping the rotation of the winding body;
Sudden descent stop device for electric shutter equipped with The winding body has a drive shaft on one end side, a driven shaft on the other end side,
The first detecting means detects the rotational speed of the drive shaft, the second detecting means detects the rotational speed of the driven shaft, and the driven brake means stops the rotation of the driven shaft. The sudden descent stop device according to claim 1, wherein the rotation of the winding body is stopped.

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