JPH0510696U - Push-up prevention device for electric shutter - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a push-up prevention device for an electric shutter in which a seat plate has a function of detecting the winding upper limit position of a shutter curtain. [Structure] A central portion of a sensing lever 34 is rotatably supported by a seat plate 32. Since the center of gravity of the sensing lever 34 is located on the left side, it normally leans to the left. Sensing lever 34
A shield plate 58 is fixed to the shield plate 58, and the shield plate 58 interlocks with the sensing lever 34. A reflection plate 48 is attached to the upper surface of the seat plate 32 so as to reflect the light emitted from the photoelectric tube 52 arranged in the shutter case. The reflector 48 is provided on the sensing lever 3 when the sensing portion 42 of the sensing lever 34 contacts the block 46 at the upper limit position.
It is shielded by the shielding plate 58 which is inclined with the rotation of 4. As a result, the light reception is blocked, the phototube 52 is activated, a signal is input to the control device, and the raising operation of the shutter curtain is stopped.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a push-up prevention device for an electric shutter that prevents push-up of a shutter curtain at an upper limit position.

[0002]

[Prior Art]

 The electric shutter is equipped with a limit switch that stops the drive unit at the upper limit position of the shutter curtain when the shutter curtain moves up. However, in the conventional limit switch, the limit switch causes an error due to a setting error or the like, which causes an inconvenience that the shutter curtain is not stopped and controlled at the upper limit position.

[0003]

[Problems to be solved by the device]

 In consideration of the facts described above, an object of the present invention is to provide an electric shutter push-up prevention device having a seat plate having a function of detecting the roll-up upper limit position of the shutter curtain.

[0004]

[Means for Solving the Problems]

 The push-up prevention device for an electric shutter according to the present invention includes a seat plate attached to the bottom of the shutter curtain, a reflector plate attached to the upper surface of the seat plate, and a lintel portion for irradiating the reflector plate. A sensor that receives the reflected light, a sensing lever that has a central portion pivotally supported by the seat plate and is rotatable in the vertical direction, and a sensing lever that is provided on the lintel portion and that touches when the shutter curtain rises to the upper limit position. A block that touches and pushes down the end of the sensing lever, a shielding plate that is fixed to the sensing lever and that rotates together with the sensing lever to shield the reflector, and a shutter that receives an input signal from the sensor. And a control means for stopping the driving of the curtain.

[0005]

[Action]

 In the electric shutter push-up prevention device with the above configuration, the upper end of the sensing lever, which is pivotally supported on the seat plate in the up-down direction, acts as a lintel when the shutter curtain is rolled up and positioned at the upper limit. Abut the placed block. As a result, one end of the sensing lever is pushed down by the block and pivots downward around the central shaft support. By this rotation, the shield plate fixed integrally with the sensing lever also rotates, and the shield wall of the shield plate shields the reflector plate. When the reflector is shielded, the sensor cannot receive light and inputs a signal to the control means. As a result, the control means stops the drive of the shutter curtain and prevents the shutter curtain from being pushed up.

Further, even when the shutter curtain descends, if the obstacle comes into contact with the lower end of the sensing lever, the lower end is pushed up and pivots upward about the pivotal support. As a result, similarly to the operation when the shutter curtain is raised, the shielding wall of the shielding plate shields the reflection plate, the sensor cannot receive light, and a signal is input to the control means. As a result, the control means stops the drive of the shutter curtain, and the safety when using the electric shutter is ensured.

[0007]

【Example】

 FIG. 1 shows an electric shutter to which the present invention is applied.

In the shutter curtain 10, both end portions of the shutter curtain 10 are inserted into a guide rail 16 having a substantially U-shaped cross section which is vertically arranged from the lintel portion 12 to the floor surface 14 so that the shutter curtain 10 moves up and down. Is configured. The upper end portion of the shutter curtain 10 is attached to a winding shaft 18, and the shutter curtain 10 is wound by rotating the winding shaft 18 via a chain 20 by a motor 22 as an opening / closing device. Or it is rewound to open and close.

Further, a drive device 24 connected to the motor 22 is arranged above the lintel portion 12. An operation switch 26 is connected to the drive device 24. By operating the operation switch 26, the shutter curtain 10 can be moved up and down and stopped. Further, the drive device 24 is connected to the control device 28.

A seat plate 32 is attached to the lower end of the lowermost slat 30 of the shutter curtain 10 along the length direction of the slat 30. As shown in FIGS. 2 and 3, at the left end of the seat plate 32 in the width direction, a vertical portion 32A that bends downward and a protruding piece 32B that bends rightward from the tip of the vertical portion 32A are provided. Has been formed. A hook portion 38 of an arm 36 formed at the left end of the sensing lever 34 is hooked on the protruding piece 32B.

On the other hand, at the right end portion of the seat plate 32 in the width direction, a cylindrical guide tube 32C is formed by cutting the lower side surface portion along the axial direction. A cylindrical body 40A formed at the tip of a shaft member 40 that is erected from the substantially central portion of the sensing lever 34 is rotatably inserted in the guide cylinder 32C. At the right end of the sensing lever 34, a sensing part 42 is formed which is widened toward the front end thereof, so that when the shutter curtain 10 is at the upper limit, the sensing part 42 comes into contact with the block 46 fixed to the lintel part 12. It has become. Since the center of gravity of the sensing lever 34 is formed so as to be located on the left side of the shaft member 40, the sensing lever 34 is inclined downward to the left unless the part of the sensing lever 34 touches an object. ..

A reflection base 50, to which a rectangular reflection plate 48 is fixed, is fixed to the right upper surface of the seat plate 32. The reflection plate 48 is arranged in the shutter case 44 and reflects light emitted from the photoelectric tube 52 connected to the control device 28. The reflected light is received by the phototube 52 again.

A shield plate 58 having a shield wall 54 for preventing light scattering or shielding light is arranged at the peripheral portion of the reflector plate 48, that is, on three sides in the longitudinal direction and the width direction of the slat 30. There is. Since the reflection base 50 is fixed to the seat plate 52 while being inserted into the opening 62 provided in the base portion 60 of the shield plate 58, the movement of the shield plate 58 is not restricted by the reflection base 50. .. An attachment portion 62 fixed to the sensing lever 34 is formed at an end portion of the base portion 60 of the shield plate 58. The mounting portion 62 penetrates an elongated hole 64 formed in the shaft member 40 of the sensing lever 34, and its tip is fixed to the sensing lever 34 (see FIG. 3). As a result, as shown in FIGS. 3 and 4, the shielding wall 54 of the shielding plate 58 moves integrally with the sensing lever 34 in the rotation direction of the sensing lever 34 (direction of arrow A), and shields. When the plate 58 rotates in the direction of arrow A, irradiation of the photoelectric tube 52 is blocked.

On the other hand, as shown in FIG. 3, a stopper 66 is attached to the upper surface on the left side of the seat plate 32, and the lower end of the shutter curtain 10 reaches the upper limit regardless of whether the operation of the motor 22 is stopped. When positioned, the shutter curtain 10 is prevented from rising and is prevented from being pushed up.

Although the sectional structures of FIGS. 3 and 4 are extended in the longitudinal direction of the seat plate 32, the reflection plate 48 and the shielding plate 58 are arranged only at positions corresponding to the photoelectric tubes 52. ..

Next, the operation of the push-up prevention device for an electric shutter according to this embodiment will be described. As shown in FIG. 1, the shutter curtain 10 is opened and closed by operating the operation switch 26 to rotate the motor 22 in the forward or reverse direction, and the winding shaft 18 to wind or rewind the shutter curtain 10. Done by.

Here, as shown in FIG. 3, when the lowermost part of the slat 30 approaches the lintel portion 12 due to a malfunction of the limit when the shutter curtain 10 rises, as shown in FIG. The sensing portion 42 of the sensing lever 34 contacts the block 46. As a result, the sensing portion 42 of the sensing lever 34 is pushed downward and rotates in the direction of arrow A (see FIG. 3) about the columnar body 40A. When the sensing lever 34 rotates, the shield plate 58 tilts in the direction of arrow B. When the shield plate 58 is inclined, the shield wall 54 shields the reflection plate 48, and the photoelectric tube 52 cannot receive the reflected light of the reflection plate 48, as shown in FIG. Therefore, the phototube 52 operates and inputs a signal to the control device 28. With this input signal, the control device 28 controls the stop of the motor 22, and the raising operation of the shutter curtain 10 is stopped. This prevents damage to the switch of the electric shutter body.

On the other hand, when the obstacle comes into contact with the lower portion of the sensing lever 34, that is, the left end portion of FIG. 3 when the shutter curtain 10 descends, the left end portion of the sensing lever 34 is pushed upward (direction of arrow C), It rotates in the direction of arrow A around the columnar body 40A. As the sensing lever 34 rotates, the shielding wall 54 shields the reflection plate 48, and a signal is input from the photoelectric tube 52 to the control device 28, and stop control is performed, as in the case of rising.

[0019]

[Effect of the device]

 As described above, in the electric shutter push-up prevention device according to the present invention, the seat plate has a function of detecting the upper limit position of the shutter curtain, so that the shutter curtain does not stop due to an abnormality of the limit switch or the like. Pushing up can be prevented.

[Brief description of drawings]

FIG. 1 is a front view showing an electric shutter to which a push-up prevention device according to an embodiment is applied.

FIG. 2 is a perspective view showing a seat plate portion of the push-up prevention device according to the present embodiment.

FIG. 3 is a cross-sectional view showing a state before the push-up prevention device according to the present embodiment operates.

FIG. 4 is a cross-sectional view showing a state when the push-up prevention device according to the present embodiment is in operation.

[Explanation of symbols]

 28 Control Device (Control Means) 32 Seat Plate 34 Sensing Lever 46 Block 48 Reflector 52 Photoelectric Cell (Sensor) 58 Shield

Claims (1)

[Claims for utility model registration] Claims: 1. A seat plate attached to the bottom of the shutter curtain, and a reflector plate attached to the upper surface of the seat plate.
A sensor that is arranged in the lintel part and irradiates the reflecting plate to receive the reflected light, a sensing lever that is pivotally supported by the seat plate in the central part and is rotatable in the up-and-down direction, and provided in the lintel part And a shield plate that is in contact with the shutter curtain when the shutter curtain is raised to the upper limit position and pushes down the end portion of the sensing lever, and a shield portion that is fixed to the sensing lever and rotates integrally with the sensing lever to shield the reflector plate. And a push-up prevention device for an electric shutter, comprising: a control unit that stops driving the shutter curtain in response to an input signal from the sensor.