JP3785694B2 - Shutter obstacle detection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to an obstacle sensing device for a shutter equipped with an emergency operation to stop the shutter when an obstacle is sandwiched when the shutter is closed in an electrically operated shutter such as a grill type or a slat type. is there.
[0002]
[Prior art]
The electric shutter installed in the opening of the building is when the shutter curtain is lowered from the upper edge of the opening and the opening is closed, and there is an object or a person under the shutter curtain. This becomes an obstacle for closing the shutter, and there is a possibility of causing a damage accident by being sandwiched between the shutter curtain and the floor surface.
[0003]
In order to prevent such an accident, if there is an obstacle in the shutter device during the descent operation, the obstacle detection unit equipped in the shutter device detects this and the shutter curtain descends. The operation is stopped and accidents are prevented.
[0004]
FIG. 11 is a cross-sectional view of a seat plate portion of a shutter curtain provided with a conventional obstacle sensing device. Therefore, in general, in a shutter configured in consideration of this kind of safety purpose, as shown in FIG. 11, a micro switch B serving as a contact-type sensor is provided at the lower edge portion of the shutter curtain A as an obstacle detection means. When the shutter curtain A is lowered, a seat-shaped main body C equipped with a U-shaped obstacle sensor D with an open portion facing upward is suspended from the seat-plate main body C. When the obstacle sensor D rides on the obstacle X, the obstacle switch D is lifted with respect to the seat body C, and the microswitch B is turned on. (Not shown) was stopped or raised after the stop.
[0005]
[Problems to be solved by the invention]
The obstacle detection means configured as described above detects the obstacle X by the relative vertical movement of the obstacle detector D with respect to the seat body C and stops or reverses the shutter drive motor. However, even if the drive motor that is rotationally driven is braked and stopped or stopped and reverses, the shutter curtain A can be driven by mechanical structural reasons such as errors and clearances between the shutter curtain members and the inertial force. There will be a time lag before the descent stops completely.
[0006]
In other words, even when the shutter curtain A rides on the obstacle, there is a problem that the load of the shutter curtain itself accompanying the lowering of the shutter curtain A is applied to the obstacle X for some time.
[0007]
Therefore, in order to solve the above-described problem, the present invention eliminates the time lag that occurs after the obstacle is detected and when the shutter curtain is stopped when there is an obstacle below the shutter curtain. An object of the present invention is to provide an obstacle sensing device for a shutter that prevents an obstacle from being loaded with a load of a shutter curtain.
[0008]
[Means for Solving the Problems]
For this reason, in the obstacle detection device for a shutter according to the first aspect of the present invention, the obstacle can be moved up and down with respect to the seat plate main body 5 on the lower surface of the seat plate main body 5 located at the lower edge of the shutter curtain 2. A sensing body 6 is provided, and when the obstacle sensing body 6 senses an obstacle and moves upward with respect to the seat plate body 5, an obstacle sensing signal is output by operating the switch element 7A of the contact sensor 7. In the shutter obstacle detection device that stops the descent of the shutter curtain, a buffer member 109 that elastically deforms in the vertical direction is interposed between the obstacle sensor 6 and the switch element 7A of the contact sensor 7. The buffer member 109 is formed of a hollow triangular or inverted V-shaped member in which at least the front and rear pieces 109A and 109B or the left and right pieces are formed of an elastic body, and the front and rear or the left and right of the bottom portion thereof The top of the obstacle sensing body 6 is held on the front and rear or left and right, and the top of the obstacle sensing body 6 faces the switch element 7A or the power transmission members 11 and 10 for operating the switch element 7A. In the upward movement process of the obstacle sensor 6, the buffer member 109 indirectly switches the switch element 7A, and the bending allowance due to the elastic deformation of the buffer member 109 in the vertical direction is the operation of the switch element 7A. Later, during the time deviation in which the descent of the shutter curtain 2 stops, the obstacle sensing body 6 is allowed to rise with respect to the seat plate body 5 by the deflection of the buffer member 109. .
[0009]
According to such an obstacle sensing device for a shutter according to claim 1, when the lower edge of the shutter curtain 2 hits the obstacle X while the shutter curtain 2 is descending, the obstacle sensor 6 is moved by the obstacle X to the seat plate body. 5, the switch element 7 </ b> A of the contact sensor 7 is pressed through the buffer member 109. Then, an obstacle detection signal is transmitted from the contact type sensor 7 or a signal generator connected thereto to the upper shutter case side by wire or an optical signal, and the shutter drive motor is stopped or reversed after the stop. Then, the descent of the shutter curtain 2 stops. At this time, after the pressing operation of the switch element 7A, the buffer member 109 is deformed in the vertical direction by the amount of the descent length of the shutter curtain 2 during the time lag when the descent of the shutter curtain 2 stops. No load is applied.
In particular, according to the obstacle sensing device of the first aspect, not only when the obstacle X is located immediately below the shutter curtain 2, but also when the obstacle X is biased to the front side or the rear side (or the left and right sides), The front piece 109 </ b> A or the rear piece 109 </ b> B (right piece or left piece) of the member 109 is elastically deformed and absorbs the descending length of the shutter curtain 2.
[0010]
Further, in the obstacle detection device for a shutter according to claim 2, the obstacle detector 6 is provided on the lower surface of the seat plate main body 5 located at the lower edge of the shutter curtain 2 so as to be movable up and down with respect to the seat plate main body 5. When the obstacle sensing body 6 senses the obstacle X and moves upward with respect to the seat plate body 5, the obstacle sensing signal is output by operating the switch element 7A of the contact type sensor 7 and the shutter curtain 2 In the obstacle detection device for a shutter that stops the descent, a cushioning member 9 that elastically deforms in the vertical direction is interposed between the seat plate body 5 and the contact sensor 7, and In the upward movement process of the obstacle sensing body 6, the deflection of the buffer member 9 switches the switch element 7A. After the operation of the switch element 7A in the subsequent deflection of the buffer member 9, During the time shift descent of the shutter curtain 2 is stopped, the bending of the buffer member 9, characterized by being configured to allow an increase with respect to the seat plate body 5 of the obstacle sensing member 6.
[0011]
According to such an obstacle sensing device for a shutter according to claim 2, when the lower edge of the shutter curtain 2 hits the obstacle X while the shutter curtain 2 is being lowered, the obstacle detector 6 is moved by the obstacle X to the seat plate body. 5, the switch element 7 </ b> A of the contact sensor 7 is pressed through the buffer member 9. Then, an obstacle detection signal is transmitted from the contact type sensor 7 or a signal generator connected thereto to the upper shutter case side by wire or an optical signal, and the shutter drive motor is stopped or reversed after the stop. Then, the descent of the shutter curtain 2 stops. At this time, after the pressing operation of the switch element 7A, the shock-absorbing member 9 is deformed in the vertical direction by the amount of the descent length of the shutter curtain 2 during the time lag when the descent of the shutter curtain 2 stops, and the obstacle X No load is applied.
[0012]
1 to FIG. 3 and Embodiment 2 of FIG. 4, the seat plate main body 5 is attached to the lower surface of the seat plate main body 5 located at the lower edge of the shutter curtain 2. On the other hand, an obstacle sensing body 6 is provided so as to be movable up and down, and when the obstacle sensing body 6 senses the obstacle and moves up relative to the seat plate body 5, the switch element 7A of the contact sensor 7 is operated. In the shutter obstacle sensing device which outputs an obstacle sensing signal to stop the descent of the shutter curtain, the vertical direction is provided between the obstacle sensing body 6 and the switch element 7A of the contact sensor 7. Buffer members 9 and 109 which are elastically deformed are interposed, and in the upward movement process of the obstacle sensing body 6 with respect to the seat plate body 5, the switch elements 7A of the switch element 7A are caused by the elastic deformation of the buffer members 9 and 109 in the vertical direction. Operation To those that are configured to permit upward movement relative to the seat plate body 5 of the obstacle sensing member 6.
[0013]
In addition, as shown in the first embodiment of FIGS. 1 to 3, the buffer member 9 is fixed on the obstacle sensor 6 facing the switch element 7A or a power transmission member that operates the switch element 7A. It is an elastic body provided at a position. This elastic body can be constituted by a leaf spring, a coil spring, or a sponge-like cushion body. Further, the vertical movement of the obstacle sensor 6 is transmitted to the switch element 7A via the buffer member 9 between the switch element 7A and the buffer member 9 or between the buffer member 9 and the obstacle sensor 6. You may make it interpose power transmission members, such as a lever member and a rotation member.
[0014]
Furthermore, as shown in Embodiment 3 in FIG. 5, the buffer member 209 may be formed on the lower surface of the obstacle sensor 6.
[0015]
According to the shutter obstacle sensing device shown in the third embodiment of FIG. 5, when the buffer member 209 hits the obstacle, the obstacle pushes the obstacle sensor 6 together with the buffer member 209 by the obstacle, and the switch element 7A. In the ascending process of the obstacle sensor 6 with respect to the seat body 5, the buffer member 209 bends after the operation of the switch element 7 </ b> A, thereby allowing the obstacle sensor 6 to rise.
[0016]
Any of the shutter obstacle detection devices described above includes an obstacle between the obstacle detector 6 and the buffer members 9, 109, between the buffer members 9, 109 and the switch element 7A, or both. Power transmission members 10 and 11 that transmit the operation of the sensing body 6 to the switch element 7A may be provided.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
The obstacle detection device for a shutter according to the present invention is provided in an electric shutter 1 disposed in an opening of a building. As shown in FIG. 1, the electric shutter 1 includes a slat-type shutter curtain 2 housed in a shutter case 3 provided on the upper edge of an opening of a house, and guide rails provided on the left and right sides of the opening. 4 and is configured to open and close the opening.
[0018]
Hereinafter, the obstacle detection device for a shutter according to the present invention will be specifically described with reference to the drawings for each embodiment.
[0019]
Embodiment 1 (see FIGS. 1 to 3):
As shown in FIG. 2, the obstacle detection device for the shutter according to the first embodiment is mounted on the seat plate body 5 at the lowermost edge of the shutter curtain 2. That is, the seat plate main body 5 is configured by a member having a substantially groove-shaped cross section with the lower side opened, and projecting suspension portions 5A and 5A are formed on the inner side of the lower edge, and the open portion thereof is formed. In the fitted state, an obstacle sensing body 6 is suspended below the seat plate body 5 so as to be movable up and down. The obstacle sensing member 6 is constituted by a substantially groove-shaped cross-section member whose upper side is open, and projecting engagement portions 6A and 6A supported by the suspension portions 5A and 5A are provided on the outer side of the upper edge. Is formed.
[0020]
Further, a contact sensor 7 made of a micro switch is mounted inside the seat plate body 5, and the switch element 7A is disposed so as to protrude downward. This contact type sensor 7 is equipped with a switch lever 8 having a roller 8A at the tip, and in response to this, the obstacle sensor 6 is made of an elastic member such as a leaf spring. A configured buffer member 9 is mounted, through which the obstacle sensor 6 corresponds to and is associated with the switch element 7A of the contact sensor.
In addition, as shown in FIG. 2, a guide groove 14 formed of a projecting piece having a substantially L-shaped cross section for accommodating a wiring connected to the switch element 7A is formed inside the seat plate body 5.
[0021]
In this embodiment, as shown in FIG. 2, the buffer member 9 is made of a leaf spring whose base is fixed to the upper surface of the obstacle sensor 6, and the horizontal free end of the inclined upper side faces the switch element 7A. is doing.
[0022]
The buffer member 9 pushes up the roller 8A of the switch lever 8 to indirectly switch the switch element 7A (see FIG. 2), but the subsequent bending allowance is an obstacle sensing body for the seat plate body 5. In the ascending process 6, after the switch element 7 </ b> A is operated, the obstacle sensing body 6 is set to be allowed to rise by the deflection of the buffer member 9 during the time deviation in which the descent of the shutter curtain 2 stops ( (See FIG. 3).
[0023]
For this reason, even if the shutter curtain 2 continues to descend for a period of time from when it detects that the seat plate body 5 has climbed on the obstacle until the shutter curtain 2 finishes descending, the load of the shutter curtain 2 on the obstacle Is not loaded.
[0024]
In Embodiment 1 described above, an example in which the buffer member 9 is configured by a leaf spring has been described. However, the cushion member 9 may be configured by a cushion member, a cylindrical member, or a coil spring as illustrated in FIG.
[0025]
When the buffer member 9 is constituted by a coil spring, as shown in FIG. 6, it is constituted by a conical coil spring, the large diameter side is attached to the obstacle sensing body 6, and the small diameter side is contacted and separated from the switch element 7A. It is set as the structure made to oppose.
According to such a structure, as shown in FIGS. 6 (A) to 6 (C), when the obstacle sensing body 6 is raised with respect to the seat plate body 5 by the obstacle X, each diameter portion of the coil spring. Will be compressed in a spiral shape, that is, even if the shutter curtain 2 continues to descend for a time from when it is detected that the seat plate body 5 has climbed on the obstacle until the shutter curtain 2 descends, The load of the shutter curtain 2 is not applied to the obstacle X.
[0026]
Moreover, in Embodiment 1 mentioned above, although the example which arrange | positioned the contact-type sensor 7 in the seat-plate main body 5 was described vertically, as shown in FIG. 7, you may arrange | position diagonally.
In this case, a power transmission member 10 that can swing in the seat plate body 5 is disposed in order to transmit the rise of the obstacle sensing body 6 to the switch element 7A of the contact sensor 7.
[0027]
The bracket 15 for attaching the contact type sensor 7 is formed in a substantially U-shaped cross section, and is configured such that the wiring of the contact type sensor 7 runs along the inside of the bracket 15, that is, the wiring space and the contact type. The sensor 7 is also attached.
According to such a structure, the wiring of the contact type sensor 7 does not interfere with the power transmission member 10 shown in FIG. 7 in the seat plate body 5, and the reliability of the operation can be improved. The interior of the seat plate body 5 can be configured at an arrangement position with little dead space, and the seat plate body 5 can be downsized.
[0028]
Embodiment 2 (see FIG. 4):
Further, as another embodiment of the present invention, a configuration as shown in FIG. 4 can be adopted. Here, the first and second power transmission members 10 and 11 are provided in the seat plate body 5, and a hollow elastic member having a substantially triangular cross section is used as the buffer member 109. The unit is attached to the obstacle sensor 6.
[0029]
The buffer member 109 has at least front and rear pieces 109A and 109B formed of an elastic body, and projections 109D project from the front and rear and top of the bottom piece 109C, and the projections 109D around the bottom piece 109C and front and rear of the inner bottom surface of the obstacle sensor 6. It is rotatably engaged in the formed recess.
[0030]
The first power transmission member 10 corresponds to a cylindrical pivot portion 10A and a contact sensor 7 provided on the seat plate body 5, for example, a switch element (actuator) 7A for turning on / off the transmitter. The lever portion 10B is provided, and the pivot portion 10A is rotatably supported by the support portion 5B formed in the seat plate body 5.
[0031]
The second power transmission member 11 is a lever whose one end is supported by the support portion 5C in the seat plate body 5. When the obstacle sensor 6 is pushed up by the obstacle X, the second power transmission member 11 is interposed via the buffer member 109. The leg portion 10C formed on the lever portion 10B of the power transmission member 10 functions to push up, and a projection 109D at the top of the buffer member 109 is rotatable at the lower center of the second power transmission member 11. It has a recessed part to be suspended.
[0032]
Therefore, when the obstacle sensing body 6 comes into contact with the obstacle X, the buffer member 109 first pushes up each power transmission member 10 and 11 as shown in FIGS. 7A is indirectly switched, but in the process of ascent of the obstacle sensing body 6 with respect to the seat plate body 5 during the subsequent deflection, during the time deviation in which the descent of the shutter curtain 2 stops after the operation of the switch element 7A. As shown in FIG. 4C, the obstacle sensor 6 is allowed to rise due to the bending thereof.
[0033]
For this reason, even if the shutter curtain 2 continues to descend for a time from when it is detected that the seat body 5 has climbed the obstacle X to when the descent of the shutter curtain 2 ends, the shutter curtain 2 The load is not applied.
[0034]
The contact-type sensor 7 used in the second embodiment is composed of a transmitter that transmits a wireless obstacle detection signal such as an optical signal to the shutter case side by the operation of the switch element 7A.
[0035]
In addition, the buffer member 109 according to the second embodiment described above may be an inverted V shape having no bottom piece. Furthermore, the buffer member 109 may have a shape that extends substantially entirely in the width direction of the obstacle sensor 6, or may have a shape in which a plurality of buffer members 109 having a small width are provided at intervals.
Further, the front and rear pieces 109A and 109B may be left and right pieces formed on the left and right.
[0036]
Embodiment 3 (see FIG. 5):
Further, as still another embodiment of the present invention, a configuration as shown in FIG. 5 can be adopted. Here, an obstacle sensor 6 having a buffer member 209 is provided below the seat plate body 5, and the obstacle sensor 6 is directly associated with the switch element 7 </ b> A of the contact sensor 7. In the ascending process of the obstacle sensor 6 with respect to 5, the buffer member 209 allows the obstacle sensor 6 to be lifted during the time deviation in which the descent of the shutter curtain 2 stops after the operation of the switch element 7A. is doing. The buffer member 209 is formed of an elastic tube, but can be formed of a cushion material or the like.
[0037]
Also in this case, when the buffer member 209 comes into contact with the obstacle X, the buffer member 209 first pushes up the obstacle sensor 6 to perform the switching operation of the switch element 7A. In the ascending process of the obstacle sensor 6 with respect to, the obstacle sensor 6 is allowed to rise due to its deflection during the time deviation in which the descent of the shutter curtain 2 stops after the operation of the switch element 7A.
[0038]
For this reason, even if the shutter curtain 2 continues to descend for a time from when it is detected that the seat body 5 has climbed the obstacle X to when the descent of the shutter curtain 2 ends, the shutter curtain 2 The load is not applied.
[0039]
Embodiment 4 (see FIG. 8):
In the fourth embodiment, as shown in FIG. 8, a U-shaped bracket 16 is provided on the upper surface of the obstacle sensing body 6, and a contact-type sensor 7 made of a microswitch or the like and a leaf spring are provided on the U-shaped bracket 16. As shown in FIG. 8 (B), the switch element 7A of the contact-type sensor 7 is provided so as to protrude upward, and the buffer member 9 is provided with the switch element 7A. The cushioning member 9 extends upward and faces the inner surface of the seat plate main body 5 so as to be in contact with and away from the bracket.
[0040]
In this case, when the obstacle sensor 6 comes into contact with the obstacle, the obstacle sensor 6 rises together with the buffer member 9 and the contact sensor 7, and the deflection of the buffer member 9 switches the switch element 7A. However, in the process of raising the obstacle sensing body 6 with respect to the seat plate body 5 in the subsequent deflection allowance, the obstacle sensing is performed by the deflection during the time deviation in which the descent of the shutter curtain 2 stops after the operation of the switch element 7A. Allow the body 6 to rise.
[0041]
For this reason, even if the shutter curtain 2 continues to descend for a period of time from when it detects that the seat plate body 5 has climbed on the obstacle until the shutter curtain 2 finishes descending, the load of the shutter curtain 2 on the obstacle Will not be loaded.
[0042]
As another structure of the fourth embodiment, as shown in FIG. 9, the contact sensor 7 is provided with the switch element 7A facing upward through the U-shaped bracket 16 on the obstacle sensor 6. The cushioning member 9 made of a coil spring is disposed in a suspended state inside the seat plate main body 5 so that the switch element 7A and the cushioning member 9 are opposed to each other so as to be in contact with and away from each other.
[0043]
Further, as shown in FIG. 10, a buffer member 9 made of a coil spring is disposed in a suspended state inside the seat plate body 5, and a contact made of a micro switch is connected to the lower end of the buffer member 9 via a bracket 17. The shape sensor 7 is provided so that the switch element 7A faces downward, that is, the switch element 7A is in the hanging direction and is in a suspended state via the buffer member 9 in a facing state where the switch element 7A is in contact with and away from the obstacle sensing body 6. It is good.
[0044]
【The invention's effect】
The shutter obstacle sensing device according to claim 1 of the present invention has been described in detail above, and when the seat plate body located at the lower edge is in contact with the obstacle while the shutter curtain is being lowered, the contact sensor is used. In the obstacle detection device for a shutter, which operates and outputs a shutter stop signal, an obstacle sensor is provided below the seat plate body, and the obstacle sensor is provided via a buffer member. Corresponding to the switch element of the contact-type sensor, the buffer member indirectly switches the switch element, and the bending allowance due to the elastic deformation of the buffer member in the vertical direction causes the obstacle sensing to the seat plate body. In the process of raising the body, after the switch element is operated, during the time deviation in which the descent of the shutter curtain stops, the buffer member is bent to cause the obstacle sensing body to move relative to the seat plate body. To allow the temperature. From this, after pressing the switch element, the buffer member is deformed in the vertical direction by the amount of the shutter curtain descending length during the time lag when the shutter curtain descending stops, and the obstacle is loaded with the shutter load. Not. In particular, according to the obstacle sensing device of the first aspect, not only when the obstacle is directly under the shutter curtain, but also when the obstacle is biased to the front side or the rear side (or the left and right sides), The front piece or the rear piece (the right piece or the left piece) is elastically deformed to absorb the lowered length of the shutter curtain.
[0045]
According to a second aspect of the present invention, there is provided an obstacle sensing device for a shutter, comprising an obstacle sensing body having a buffer member, the obstacle sensing body corresponding to a switch element of the contact-type sensor, In the ascending process of the obstacle sensor, the switch element is switched by the deflection of the buffer member, and after the operation of the switch element, during the time shift in which the descent of the shutter curtain stops, Allow the obstacle sensor to rise relative to the seat plate body. Then, after the pressing operation of the switch element at this time, the buffer member is deformed in the vertical direction by the amount of the shutter curtain descending length during the time lag when the shutter curtain descending stops, and the seat body of the obstacle sensing body Even if the shutter curtain continues to descend for a period of time from when it is detected that the seat plate body has climbed on the obstacle until the shutter curtain descends, Shutter load is not applied.
[0046]
Therefore, when there is an obstacle when the shutter curtain is lowered, the cushioning member is elastically deformed in the vertical direction against the time shift that occurs after the obstacle is detected until the shutter curtain is stopped. An effect is obtained in which an upward stroke of the obstacle sensor with respect to the main body is generated, thereby preventing the load of the shutter curtain from being applied to the obstacle.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of an electric shutter device provided with an obstacle sensing device of the present invention. FIG. 2 (A) is a longitudinal side view showing a first embodiment of the obstacle sensing device of the present invention. Front view of main part [FIG. 3] (A) Longitudinal side view showing operation in the obstacle sensing device (B) Front view of main part [FIG. 4] (A) Longitudinal section showing Embodiment 2 of the present invention Side view (B) Longitudinal side view showing the second embodiment of the present invention (C) Longitudinal side view showing the second embodiment of the present invention FIG. 5 is a schematic longitudinal side view showing the third embodiment of the present invention. 6A is a vertical side view of another embodiment. FIG. 6B is a vertical side view of another embodiment. FIG. 6C is a vertical side view of another embodiment. FIG. Side view [Fig. 8] (A) Schematic longitudinal side view showing Embodiment 4 of the present invention (B) Schematic front sectional view [Fig. 9] Vertical side view of another embodiment Figure 10 is a longitudinal side view of another embodiment of FIG. 11 is a schematic longitudinal sectional view of a conventional example [Description of symbols]
DESCRIPTION OF SYMBOLS 1 ... Shutter 2 ... Shutter curtain 3 ... Shutter case 4 ... Guide rail 5 ... Seat board main body 6 ... Obstacle sensor 7 ... Contact type sensor 7A ... Switch element 9, 109, 209 ... Buffer member 10, 11 ... Power transmission member

Claims (2)

An obstacle sensor is provided on the lower surface of the seat plate body located at the lower edge of the shutter curtain so as to be movable up and down relative to the seat plate body. The obstacle sensor senses the obstacle and detects the obstacle. In the obstacle detection device for a shutter which stops the descent of the shutter curtain by outputting an obstacle detection signal by operating the switch element of the contact type sensor when it is moved upward, the obstacle detector and the contact type A shock-absorbing member that elastically deforms in the vertical direction is interposed between the switch element of the sensor and the shock-absorbing member is a hollow triangular or inverted V-shaped member in which at least the front and rear pieces or the left and right pieces are formed of an elastic body. The front / rear or left / right of the bottom part is held front / rear or left / right on the obstacle sensor, and the top part of the bottom is paired with the switch element or a power transmission member for operating the switch element. And which, in the upward course of the obstacle sensing member relative to the seat plate body, said cushioning member is indirectly switching operation the switch element, allowance deflection due vertical elastic deformation of the cushioning member, After the operation of the switch element, the obstacle sensor is allowed to rise with respect to the seat plate body by the deflection of the buffer member during a time lag when the descent of the shutter curtain stops. Obstacle sensing device for shutter. An obstacle sensor is provided on the lower surface of the seat plate body located at the lower edge of the shutter curtain so as to be movable up and down relative to the seat plate body. The obstacle sensor senses the obstacle and detects the obstacle. In the obstacle detection device for a shutter, which stops the descent of the shutter curtain by outputting an obstacle detection signal by operating a switch element of the contact type sensor when moved upward, the seat plate body and the contact type sensor A buffer member that elastically deforms in the vertical direction is interposed therebetween, and in the upward movement process of the obstacle sensor relative to the seat plate body, the deflection of the buffer member switches the switch element, and the buffer In the subsequent deflection of the member, after the operation of the switch element, the obstacle detection is performed by the deflection of the buffer member during the time deviation in which the descent of the shutter curtain stops. Shutter obstacle sensing device characterized by elevated by being configured to allow the.

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