JP3820723B2 - Electric shutter obstacle detection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an obstacle detection device for an electric shutter, and more particularly to an improvement in an obstacle detection device that stops a switch by detecting a load applied to a shutter curtain that is being lowered.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there is known an obstacle sensing device that stops a shutter curtain by transmitting the load to an opening / closing device such as an electric motor that is a driving source when the shutter curtain when lowered comes into contact with the obstacle.
[0003]
FIG. 5 is a conceptual diagram of a shutter equipped with a conventional obstacle sensing device. When a shutter 5 that moves up and down a shutter curtain 3 disposed in an opening 1 of a building is detected, an obstacle is sensed during the raising and lowering. An obstacle sensing device 7 for safely controlling the shutter curtain 3 is provided.
[0004]
As the obstacle sensing device 7, a method of sensing a load (load sensing method) applied to the opening / closing device 9 that moves the shutter curtain 3 up and down is frequently used because of its low cost.
[0005]
This load sensing type obstacle sensing device 7 detects the current value of the switch 9 or detects the amount of rotation using a tachometer or an encoder, and detects the amount of obstacle between the shutter curtain 3 and the obstacle from the fluctuation of the current value and the amount of rotation. The opening / closing device 9 is driven and controlled to detect contact with an object and to stop or reversely lift the shutter curtain 3.
[0006]
[Problems to be solved by the invention]
However, the shutter curtain is normally configured to generate an urging force in a direction in which the shutter curtain is wound up, that is, in a direction in which the shutter curtain is lifted. In doing so, it must have a driving torque that resists the urging force and does not stop due to the weight of the shutter curtain itself.
[0007]
Therefore, to stop the switch when the shutter curtain is lowered (closed) and touches the obstacle, the obstacle must be borne by the force necessary to stop the switch, In other words, since the switch is driven so that the shutter curtain is lowered onto the obstacle after the shutter curtain touches the obstacle, the weight of the shutter curtain and the descent force by the switch are applied to this obstacle. Is generated, and the force is required to operate the obstacle sensing device. This force becomes the sensing power of the obstacle sensing device, and if this sensing power is large, Overload.
[0008]
In addition, when the sensing force is large, that is, the force applied to the obstacle is sufficiently large and the obstacle is sensed, the shutter curtain has a small opening opening. Therefore, even if the curtain weight touches an obstacle, the contact cannot be detected, and the switch continues to drive with the shutter curtain still in contact with the obstacle. The shutter curtain sometimes loosened inside the case.
[0009]
Accordingly, the present invention has been made in view of the above circumstances, and in an obstacle sensing device that senses a load applied to a switch and stops the lowering of the shutter curtain, when the lowering shutter curtain contacts the obstacle An object of the present invention is to provide an obstacle detection device for an electric shutter that can reduce the load applied to the obstacle.
[0010]
[Means for Solving the Problems]
Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments.
The obstacle detection device for an electric shutter according to the present invention supports a winding cage 19 around which a shutter curtain 61 is wound so as to be rotatable with respect to a support shaft 11, and from an opening / closing device 21 provided on the support shaft 11. An outer wheel 13 to which a rotational driving force is transmitted;
An inner wheel 37 that is rotatably supported by the support shaft 11 and that is biased in a direction to wind up the shutter curtain 61 by a take-up spring 43 that is externally attached to the support shaft 11;
An elongated hole 45 that is formed in the inner wheel 37 and is elongated along the circumferential direction;
An outer wheel pin 49 that is coaxial with the support shaft 11 and protrudes from the outer wheel 13 and is slidably fitted in the longitudinal direction of the elongated hole 45;
It is stretched over the outer wheel pin 49 and the inner wheel 37, and a force smaller than the moment generated by the weight of the shutter curtain 61 hanging from the winding basket 19 is applied to the inner wheel 37. A wheel spring 51 for urging the outer wheel 13 in the winding direction is provided.
[0011]
In this obstacle sensing device, when the lower end of the shutter curtain 61 comes into contact with the obstacle 63, the weight of the shutter curtain 61 is borne by the obstacle 63, and the wheel spring 51 that has been extended due to the shutter curtain 61 being in a suspended state. Contracts.
With this pulling force, the outer wheel 13 is urged in the shutter curtain ascending direction via the outer wheel pin 49, and the load on the obstacle 63 is reduced accordingly.
[0012]
The outer wheel 13 is formed in an annular shape,
The inner wheel 37 is formed with a groove-like gap 41 that is continuous in the circumferential direction at the periphery,
A configuration in which the inner peripheral edge of the outer wheel 13 is slidably inserted into the concave groove 41 and the outer wheel 13 is supported on the peripheral edge of the inner wheel 37 so as to be relatively rotatable.
[0013]
According to this configuration, the inner peripheral edge of the outer wheel 13 is slidably inserted into the concave groove-shaped gap 41 formed on the peripheral edge of the inner wheel 37 so that it can rotate with respect to the support shaft 11 and be relative to each other. The separately rotatable inner wheel 37 and outer wheel 13 can be attached to the support shaft 11 in an integral structure.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of an obstacle detection device for an electric shutter according to the present invention will be described in detail with reference to the drawings.
[0015]
FIG. 1 is a front view of an electric shutter equipped with an obstacle sensing device according to the present invention, FIG. 2 is an enlarged view of an end portion of a winding cage in FIG. 1, and FIG.
[0016]
In a shutter case (not shown) disposed at an upper edge portion of an opening portion such as a window of a building such as a house, a support shaft 11 is connected to both ends via a pair of brackets disposed at both left and right end portions. Supported and fixed horizontally.
[0017]
Circular outer wheels 13 are rotatably attached to both ends of the support shaft 11 and the outer periphery of the central portion.
[0018]
Each outer wheel 13 is provided with three holding holes 15 (see FIG. 3) that are equally spaced in the circumferential direction, and connecting rods 17 are inserted and fixed in the holding holes 15, respectively.
Therefore, the outer wheel 13 and the connecting rod 17 constitute a cylindrical frame-shaped winding basket 19 that is rotatably supported by the support shaft 11.
A shutter curtain 61 is wound around the outer periphery of the winding basket 19.
[0019]
Further, between the outer wheel 13 on one end side of the support shaft 11 on the right side in FIG. 1 and the outer wheel 13 in the center portion, the opening / closing machine 21 is fixed inside the take-up basket 19. .
[0020]
The switch 21 includes at least an electric motor 23, transmission means 25 that transmits the rotation of the electric motor 23 to the winding basket 19, a receiver 27 that receives a remote operation signal, and a control unit (not shown). It is configured.
[0021]
The transmission means 25 winds the pinion 31 connected to the output shaft of the electric motor 23 via a clutch mechanism 29 such as a dog clutch, a rotating member 33 equipped with an internal gear meshing with the pinion 31, and the rotating member 33. The connecting plate 35 is connected to the take-up basket 19.
[0022]
Accordingly, when the electric motor 23 of the opening / closing machine 21 fixed to the support shaft 11 rotates, the pinion 31 rotates the rotating member 33, and the rotating member 33 rotates the winding basket 19 via the connecting plate 35. ing.
[0023]
Further, the control unit of the switch 21 detects the current value of the electric motor 23 or detects the rotation amount using a tachometer or an encoder, and the shutter curtain 61 and the obstacle 63 are detected from fluctuations in the current value and rotation amount. A known obstacle sensing function for driving and controlling the electric motor 23 is provided so as to stop or reversely lift the shutter curtain 61 by sensing the contact with the motor.
[0024]
Moreover, in this embodiment, each outer wheel 13 which comprises the winding cage | basket 19 is formed in the annular | circular shape, The circular inner wheel 37 and circular winding spring fixing plate 39 which are shown in FIG. The support shaft 11 is rotatably attached.
[0025]
As shown in FIG. 2, the inner wheel 37 and the take-up spring fixing plate 39 are integrally fixed to the outer peripheral edge so as to form a concave groove-like gap 41 continuous in the circumferential direction, and are fixed to the support shaft 11. It is rotatable and attached to the support shaft 11.
[0026]
The outer wheel 13 formed in an annular shape has an inner peripheral hole at the center, and the inner peripheral edge of the inner peripheral hole is slidably held in the groove 41. That is, the outer wheel 13 is supported on the outer peripheral edge of the inner wheel 37 so as to be relatively rotatable.
[0027]
Further, between the outer wheel 13 on the other end side (left side in FIG. 1) of the support shaft 11 and the outer wheel 13 in the center portion, a winding made of two coil springs having one end fixed to the support shaft 11. A take-up spring 43 is wound.
[0028]
The other ends of the winding springs 43 are fixed to the respective winding spring fixing plates 39.
[0029]
The inner wheel 37 integrated with the take-up spring fixing plate 39 is urged by the take-up springs 43 in the rotational direction in which the shutter curtain 61 is taken up.
[0030]
As shown in FIG. 3, the inner wheel 37 has a long hole 45 formed in the vicinity of the outer peripheral edge along the circumferential direction.
[0031]
In the present embodiment, four long holes 45 are provided at equal intervals in the circumferential direction of the inner wheel 37.
[0032]
The inner wheel 37 is provided with a single inner wheel pin 47 that projects in the same direction as the support shaft 11.
[0033]
Further, the outer wheel 13 is provided with an outer wheel pin 49 protruding in the same direction as the support shaft 11, and the outer wheel pin 49 is formed in the elongated hole 45 formed in the inner wheel 37 in the longitudinal direction of the elongated hole 45. It is freely slidable and is fitted freely.
That is, the outer wheel pin 49 and the inner wheel 37 rotate relative to each other within a range in which the outer wheel pin 49 moves within the elongated hole 45.
[0034]
As shown in FIG. 3, a wheel spring 51 is stretched between the tip of the outer wheel pin 49 penetrating the elongated hole 45 and the inner wheel pin 47.
[0035]
The wheel spring 51 is formed of a tension coil spring, and is set to have a pulling force having a smaller force than the moment generated in the outer wheel 13 by the dead weight of the shutter curtain 61 that is suspended with respect to the winding basket 19. The outer wheel 13 is urged with respect to the inner wheel 37 in the direction in which the curtain 61 is wound (clockwise in FIG. 3).
[0036]
Accordingly, since the load of the shutter curtain 61 does not act on the wheel spring 51 in a state where the shutter curtain 61 does not hang down, the outer wheel pin 49 has an inner wheel pin 49 as shown in FIG. 47 is arranged at the end of the long hole on the side approaching 47.
[0037]
Next, the operation of the obstacle sensing device configured as described above will be described with reference to FIG.
FIG. 4 is an explanatory diagram showing the state of the obstacle sensing device according to the present invention before and after the shutter curtain 61 contacts the obstacle 63.
[0038]
First, when the opening / closing device 21 receives a shutter closing signal, the winding basket 19 rotates via the electric motor 23, the transmission means 25, and the connecting plate 35, and the shutter curtain 61 starts to descend.
[0039]
Since the shutter curtain 61 is in a suspended state with respect to the winding basket 19, the wheel spring 51 having a force smaller than the weight of the shutter curtain 61 is in an extended state, and as shown in FIG. The wheel pin 49 is located at the end of the long hole on the side away from the inner wheel pin 47.
[0040]
In this state, the inner wheel 37 is urged in the clockwise direction (broken arrow direction) in FIG. 4A by the winding spring 43 with respect to the support shaft 11, and the outer wheel 13 is supported by the support shaft 11. 11 is urged clockwise through the outer wheel pin 49.
[0041]
Therefore, the opening / closing machine 21 rotates the outer wheel 13 counterclockwise against the urging force of the winding spring 43, and the shutter curtain 61 is rewound.
[0042]
Next, as shown in FIG. 4B, when the lower end of the shutter curtain 61 comes into contact with the obstacle 63, the weight of the shutter curtain 61 is borne by the obstacle 63, and the shutter curtain 61 side of the shutter curtain 61 is arranged. Weight is reduced.
[0043]
Here, since the shutter curtain 61 is in a suspended state with respect to the winding basket 19, the tension of the wheel spring 51 that has been in an extended state is reduced by reducing the weight of the shutter curtain 61. The outer wheel pin 49 is moved so as to be pulled to the end of the long hole on the side approaching the inner wheel pin 47.
[0044]
That is, when the shutter curtain 61 comes into contact with the obstacle 63, the wheel spring 51 urges the outer wheel 13 in the shutter curtain ascending direction (the clockwise direction in FIG. 4B). Only the weight of 61 will be reduced.
[0045]
In this state, the outer wheel pin 49 and the inner wheel pin 47 are connected by the contracted wheel spring 51, and the outer wheel 13 is connected to the outer wheel 13 via the inner wheel 37 (in FIG. 4B). The urging force in the clockwise direction, that is, the urging force of the winding spring 43 is received.
[0046]
Due to the urging force of the take-up spring 43, the amount of rotation of the electric motor 23 that tries to drive the outer wheel 13 in the closing direction (counterclockwise) is changed.
[0047]
Then, the switch 21 senses the fluctuation of the rotation amount by the control unit, sends a stop signal to the electric motor 23, and stops.
[0048]
Thus, according to the obstacle sensing device described above, when the shutter curtain 61 contacts the obstacle 63, the wheel spring 51 acts in a direction to assist the urging force in the winding direction of the winding spring 43. Therefore, it is possible to reduce the load on the obstacle 63 when the shutter curtain 61 being lowered contacts the obstacle 63. At the same time, the sensing power when stopping the shutter curtain 61 is reduced.
[0049]
In the above-described embodiment, the example in which the outer wheel 13 and the inner wheel 37 are configured integrally has been described. However, the outer wheel 13 and the inner wheel 37 are separated from the support shaft 11 so as to be relatively rotatable. It may be attached by the body.
[0050]
【The invention's effect】
As described above in detail, according to the obstacle sensing device of the first aspect of the present invention, the outer wheel and the inner wheel are provided on the support shaft so as to be relatively rotatable, and the wheel spring extends over the outer wheel and the inner wheel. The wheel spring is configured to urge the outer wheel against the inner wheel in the shutter curtain winding direction as a force smaller than the moment generated by the weight of the shutter curtain hanging from the winding basket. Therefore, when the lower shutter curtain comes in contact with an obstacle, the outer wheel rotates in the winding direction with respect to the inner wheel, and the urging force in the winding direction by the winding spring against the inner wheel. Therefore, there is no obstacle to the obstacle without increasing the load by the switch. Sensing is performed, i.e., it is possible to reduce the load with respect to the obstacle.
[0051]
According to the obstacle sensing device of the second aspect, a circumferential groove groove is formed on the periphery of the inner wheel, and the inner periphery of the outer wheel is slidably inserted into the groove groove. Since the outer wheel is supported on the peripheral edge of the inner wheel so as to be relatively rotatable, the inner wheel and the outer wheel can be configured integrally, and the structure of the winding basket can be made compact.
[Brief description of the drawings]
FIG. 1 is a front view of an electric shutter including an obstacle sensing device according to the present invention.
FIG. 2 is an enlarged view of an end portion of the winding cage in FIG. 1;
3 is an AA arrow view in FIG. 2;
FIG. 4A is an explanatory diagram showing a state of the obstacle sensing device according to the present invention before the shutter curtain contacts the obstacle.
(B) It is explanatory drawing which shows the state of the obstruction detection apparatus based on this invention after a shutter curtain contacts an obstruction.
FIG. 5 is a front view of an electric shutter provided with a conventional obstacle sensing device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Support shaft 13 ... Outer wheel 19 ... Winding basket 21 ... Opening / closing machine 37 ... Inner wheel 41 ... Groove-shaped gap 43 ... Winding spring 45 ... Long hole 49 ... Outer wheel pin 51 ... Wheel spring 61 ... Shutter curtain

Claims (2)

An outer wheel that rotatably supports a winding cage around which the shutter curtain is wound, and a rotational driving force transmitted from an opening / closing device disposed on the supporting shaft;
An inner wheel that is rotatably supported by the support shaft and urged in a direction to wind up the shutter curtain by a take-up spring extrapolated to the support shaft;
An elongated hole formed in the inner wheel and elongated along the circumferential direction;
An outer wheel pin that is coaxial with the support shaft and protrudes from the outer wheel and is slidably fitted in the longitudinal direction of the elongated hole;
The outer wheel pin and the inner wheel are stretched over and the force is smaller than the moment generated by the weight of the shutter curtain in a suspended state with respect to the winding basket, and the outer wheel is wound around the inner wheel. An obstacle detection device for an electric shutter, comprising a wheel spring biased in a direction. The outer wheel is formed in an annular shape,
The inner wheel is formed with a groove-like gap continuous in the circumferential direction on the periphery,
The obstacle of the electric shutter according to claim 1, wherein an inner peripheral edge of the outer wheel is slidably inserted into the groove-like gap and the outer wheel is supported on the peripheral edge of the inner wheel so as to be relatively rotatable. Object sensing device.

Images