JPH0816247A - Lifting position detection device and lifting abnormality detection device - Google Patents

Abstract

(57) [Summary] [Purpose] To accurately detect the position of the lifted member and to detect abnormalities during lifting. [Structure] The rotating body 6 is moved along with the vertical movement of the suspension member 2.
Is rotated, and the rotation amount of the rotating body 6 causes the lifted and lowered members 4,
It is converted to a lifting position P of 5 and output. Further, the contact pressure F between the suspension member 2 and the rotating body 6 is detected, the detected contact pressure F is compared with a predetermined threshold value, and an abnormal signal is output based on the comparison result.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for detecting an ascending / descending position of a member to be lifted and an abnormality during ascending / descending, and more particularly to a device for detecting an ascending / descending position of a blind (slat, bottom lam) and an ascending / descending condition. .

[0002]

2. Description of the Related Art In an electric blind, since the elevation of the blind is automatically controlled, a position sensor for detecting the elevation of the blind, that is, the slats as the members to be elevated and lowered and the bottom rail is used as a control device. Built into.

As a technique for detecting the ascending / descending position of this type of blind, there is, for example, the technique disclosed in Japanese Patent Publication No. 4-16591. In the technique described in this publication, as shown in FIG. 15, the number of rotations of the shaft 32 for raising and lowering the lifting tape 33 on which the slats and the like are suspended is detected, and the raising and lowering positions of the slats and the like are detected by this number of rotations. It

Further, as seen in JP-A-2-190591 and JP-A-63-167887, a lifting tape is formed by forming a large number of holes in the longitudinal direction of the lifting tape or drawing a continuous striped pattern. There is a technique for detecting the ascending / descending position of a slat or the like by counting the number of holes or the number of stripes in accordance with the vertical movement of the.

Further, as disclosed in Japanese Patent Laid-Open No. 2-197685, the contact point of the variable resistor is changed according to the ascending / descending position of a slat or the like, and the resistance value corresponding to the change is converted to the ascending / descending position and output. There is technology.

[0006]

[Problems to be Solved by the Invention]
In the technology for detecting the rotation speed described in Japanese Patent No. 16591, the rotation speed of the lifting shaft 32 (the rotation speed of the rotation drive motor) is increased as shown in comparison with FIGS. 15 (a) and 15 (b). ) Is the same value, when the shaft 32 takes up the lifting tape 33 and the take-up diameter is small ((a) in the figure), the moving speed of the tape 33 is slow and the take-up diameter is large. In this case ((b) in the figure), the moving speed of the tape 33 is high. The difference becomes more remarkable as the winding diameter increases.

Therefore, when the moving speed of the tape 33 is controlled based on the output of the sensor for detecting the number of rotations, the number of rotations cannot be used as it is as the moving speed of the tape 33. It is necessary to make a corresponding correction. This makes control extremely complicated and difficult.

Further, even if the winding amount of the tape 33 is the same, depending on the tightening condition of the tapes,
The winding diameter may be different, which causes the tape 33
An error may occur in the ascending / descending speed (position) of. Also,
Similarly, an error will occur due to the difference in elasticity of the tape 33. For this reason, for example, when controlling the ascending / descending positions of a plurality of blinds having different specifications in synchronization with each other, the accuracy of control deteriorates.

Further, the technique of forming a large number of holes or drawing a continuous striped pattern in the longitudinal direction of the lifting tape described in Japanese Patent Application Laid-Open No. 2-190591, etc., is in a blind that emphasizes aesthetic appearance. This is unfavorable because it will spoil the aesthetics. Furthermore, the lifting tape
This is a part that is greatly affected by the installation environment, and there is a risk that the positional information will be lost due to the striped pattern disappearing due to changes over time due to sunlight, dirt, and the like.

Further, in the technique for reading the resistance value of the variable resistor disclosed in the above-mentioned Japanese Patent Laid-Open No. 2-197685,
As the total length of the blind in the vertical direction becomes longer, a large variable resistor is required, which leads to an increase in cost. On the other hand, if the variable resistor is commonly used to avoid cost increase, the accuracy of position measurement deteriorates as the total length of the blind becomes longer, as is clear from measurement engineering.

The first invention of the present invention has been made in view of the above problems of the prior art, and does not cause an error due to the number of rotations of the shaft for winding the lifting tape or the tightening condition of the tapes. Moreover, it does not affect the aesthetic appearance and is not affected by aging,
Further, it is another object of the present invention to provide a device for detecting the ascending / descending position of an ascended / descended member, which does not increase the cost due to the total length of the blind.

Furthermore, the second invention of the present invention is based on the first invention.
An apparatus capable of accurately detecting an abnormality that occurs during lifting and lowering of a lifted / lowered member is configured by a structure including a main component common to the main components of the invention, and the provision thereof. It is intended.

[0013]

Therefore, the first aspect of the present invention
According to the invention, an elevating position detecting device for detecting an elevating position of an elevating member when the elevating member is moved up and down by vertically moving a long hanging member on which the elevating member is suspended. In the above, a rotating body disposed with its rolling surface in contact with the hanging member so as to be driven to rotate in accordance with the vertical movement of the hanging member, and And a conversion means for converting the member into an up-and-down position.

Further, according to the second aspect of the present invention, when the elevating member is moved up and down by vertically moving a long suspension member on which the elevating member is suspended,
In a lift abnormality detecting device for detecting a lift abnormality of the lifted member, a rolling surface is arranged so as to be in contact with the hanging member so as to be rotationally driven with the vertical movement of the hanging member. Abnormal signal by comparing the contact pressure detected by the rotating body, the contact pressure detecting means for detecting the contact pressure between the suspension member and the rotating body, and the contact pressure detecting means with a predetermined threshold value. And an abnormality detecting means for outputting.

[0015]

According to the construction of the first aspect of the invention, as shown in FIG. 1, the rotating body 6 is rotated as the hanging member 2 moves in the vertical direction, and the amount of rotation of the rotating body 6 is raised and lowered. It is converted to the ascending / descending position P of the members 4 and 5 and output.

According to the structure of the second aspect of the invention, as shown in FIG. 9, the contact pressure F between the suspension member 2 and the rotating body 6 is detected, and the detected contact pressure F is set to a predetermined threshold. The value is compared, and an abnormal signal is output based on the comparison result.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the lifting position detecting device and the lifting abnormality detecting device according to the present invention will be described below with reference to the drawings.

First Embodiment FIG. 1 is a diagram showing the construction of an embodiment of an ascending / descending position detecting device, which is applied to detection of the ascending / descending position of an electric blind 1. The up-and-down position of the blind 1 is specifically the up-and-down position of the slat 4 and the bottom rail 5 as its constituent elements.

As shown in FIG. 1, a lifting tape 2, which is a long suspension member, has slats 4 whose posture angle can be adjusted and a bottom rail 5 which serves as a weight during lifting. It has been lowered. Lifting tape 2 is
The tape is wound around the tape winding shaft 3 so as to be freely wound.

On one surface 2a of the tape 2, a rotating body (pulley) 6 is indicated by an arrow B as the tape 2 moves in the vertical direction A.
The rotating body 6 is provided so that the rolling surface 6a of the rotating body 6 is brought into contact with the rotating body 6 so as to be driven to rotate as shown in FIG. The shaft 7 of the rotating body 6 is rotatably supported at a predetermined position.

The encoder 8 (for example, a pulse encoder is used) is attached to the rotating body 6 and converts the amount of rotation of the rotating body 6 into the ascending / descending position P of the slats 4 or the like and outputs it as a position signal P.

FIG. 2 is a block diagram showing the configuration of a control device for controlling the vertical position of the electric blind 1 shown in FIG.

As shown in FIG. 2, this control device constitutes a general feedback control system, and the command circuit 1
A signal indicating the target ascending / descending position Pd of the slats 4 and the like from 2 is output to the control circuit 11. On the other hand, the position sensor 10 is composed of the rotating body 6 and the encoder 8. As described above, the position sensor 10 outputs a signal indicating the current elevating position P of the slat 4 or the like to the control circuit 11.

The control circuit 11 takes the deviation between the input target ascending / descending position Pd and the current ascending / descending position P and outputs a signal corresponding to this deviation to the drive circuit 13. The drive circuit 13 generates a drive signal V according to the input signal and outputs it to the motor 9. As a result, the motor 9 drives the tape winding shaft 3 to rotate in the direction of arrow C in response to the drive signal V,
The lifting tape 2 is moved vertically in the direction of arrow A. In this way, the slat 4 and the bottom rail 5 are moved to the target lifting position Pd.

When the attitude angle of the slat 4 is adjusted according to the movement of the lifting tape 2, the position sensor 10 can be used as a slat attitude angle sensor.

FIGS. 3 to 8 show a concrete structure or a modification of the position sensor 10 shown in FIG.

That is, in FIG. 3, the rotating shaft of the pulley 6 and the rotating shaft of the rotating plate 14 of the pulse encoder 8 are connected by the connecting member 18, and the rotating plate 14 is rotated according to the rotation of the pulley 6. Has become. Then, light is generated from the light generation circuit 15, and this light passes through the slit 14 a on the rotary plate 14. The light passing through the slit 14a is added to the pulse signal generation circuit 16 and output as a pulse signal via the comparator 17 and the like. And
This pulse signal is added to the counter at the subsequent stage, and the pulse is counted by this counter,
The relative elevation position or absolute elevation position of the slat 4 or the like is detected. An absolute encoder may be used as the encoder.

FIG. 4 shows the case where a multi-turn potentiometer 8'is used. In this case, unlike the counter, the position information (resistance value) is not erased even when the power is turned off, which is suitable for the absolute position measurement.

FIG. 5 shows the lifting tape 2 and the pulley 6.
In order to increase friction between and to eliminate slippage,
The tape 2 is arranged so as to be bridged over the two pulleys 6 and 6 '.

Similarly, in FIG. 6, in order to increase the friction between the pulley 6 and the lifting tape 2, the contact area between them is increased.

Similarly in FIG. 7, in order to increase the friction,
The tape 2 is arranged so as to be sandwiched from both sides by two pulleys 6 and 6 '.

FIG. 8 shows that in order to increase the friction as well,
The unevenness 2b is provided in the longitudinal direction of the lifting tape 2 ',
The concavities and convexities 2b are configured to mesh with the teeth of a rotating body configured as a sprocket 19.

As described above, by increasing the friction and eliminating the slip, the accuracy of detecting the ascending / descending position can be further improved.

Second Embodiment In the second embodiment, in addition to the structure of the first embodiment described above, a component for judging an abnormality when the slat 4 and the bottom rail 5 are moved up and down is added. It is a thing.

That is, as shown in FIG. 9, the rolling surface 6a of the rotating body 6 is in contact with the surface 2a on one side of the lifting tape 2 as in the case of the first embodiment. A pressure sensor 20 for detecting a force F (contact pressure F) with which the lifting tape 2 presses the rotating body 1 is added. One end of a spring 21 is connected to the rotating body 6, and the rotating body 6 and the tape 2 are brought into contact with each other with a contact pressure F balanced with the elastic force of the spring 21.

Here, if any abnormality occurs during lifting or lowering, the tension or the like of the tape 2 changes and the contact pressure F changes. Therefore, if the contact pressure F is above or below a predetermined threshold value indicating an abnormality, this case is determined to be abnormal, and the determination result is output. In the drawings, an encoder or the like that outputs the ascending / descending position P is omitted.

FIG. 10 shows the specific structure of FIG. 9, in which one end of the spring 21 is connected to the rotating body 6 and the other end is connected to the spring fixing member 23. Thus the rotating body 6
Is the elastic force of the spring 21 and the pressing force (contact pressure) F of the tape 2.
Are located in a balanced position, and can swing from the position in the directions D1 and D2 substantially perpendicular to the surface 2a of the tape 2.

In a normal state, the contact sensors (switches) 22a and 22b as the pressure sensor 20 are arranged so as to sandwich the rotating body 6 at positions where the rolling surface 6a of the rotating body 6 does not contact. There is. The one contact sensor 22a is a sensor that detects that the rotating body 6 has moved in the direction D1 approaching the tape 2, and the other sensor 22a.
Reference numeral b is a sensor for detecting that the rotating body 6 has moved in the direction D2 away from the tape 2.

If the blind 1 comes into contact with an obstacle during the up-and-down movement and the tape 2 sags, the tension of the tape 2 decreases and the contact pressure F decreases.
Then, the rotating body 6 moves in the direction of the arrow D1 and eventually comes into contact with the contact sensor 22a, and the sensor 22a detects this. The signal S1 indicating the contact is applied to the detection circuit 24, and the detection circuit 24 has an abnormal rise and fall (tape slack).
Is output.

Similarly, when the blind 1 is caught by an obstacle and the tape 2 is difficult to move due to a load, the tension of the tape 2 increases and the contact pressure F increases. Then, the rotating body 6 moves in the direction of the arrow D2, and eventually contacts the contact sensor 22b.
Detects this. The signal S2 indicating the contact is applied to the detection circuit 24, and the detection circuit 24 outputs the signal S3 indicating the up / down abnormality (overload).

FIG. 11 is a flow chart showing the procedure of processing when the control device shown in FIG. 2 is applied to the structure of FIG.

That is, first, the initial position P0 of the ascending / descending position of the slat 4 and the bottom rail 5 is set, and the ascending / descending position P with this initial position P0 as the reference position is subsequently detected (step 101).

Next, the command value (target lift position) Pd for the lift position is input to the control circuit 11 (step 10).
2) The command value Pd and the current position P are compared (step 103).

If both are equal (YES at step 104), it is assumed that the slats 4 have moved to the target lift position Pd, and the drive signal V is turned off to stop the lift (step 109).

On the other hand, if the slats 4 and the like have not reached the target ascending / descending position Pd (determination N in step 104).
O), the procedure is moved to step 105, and it is determined whether the ascending / descending position has reached the upper limit position or the lower limit position.
Note that this determination can be made based on, for example, the detection signal of the limit switch (step 105). Then, if it is determined that the upper limit or the lower limit position has been reached, the drive for raising and lowering can no longer be continued, so the procedure moves to step 109 to stop the raising and lowering as described above ( Step 109).

When it is determined that the upper limit or the lower limit is not reached, it is determined whether the abnormality detection signal S3 is output from the detection circuit 24 (step 106).

When the abnormality detection signal S3 is not normally output, the drive signal V is continuously output to continue the ascending / descending (step 107), and a signal indicating the successive ascending / descending position P is obtained from the position sensor 10. (Step 10
8), the procedure shifts to the above step 102 again.

However, when the abnormality detection signal S3 is output, it is not preferable to continue the ascent / descent for safety and the like, so the procedure is shifted to step 109 and the blind 1 is stopped emergency.

12, 13 and 14 show another example of the structure of the pressure sensor 20. 13 is a view on arrow G of FIG. 12, and FIG. 14 is an equivalent circuit diagram of FIG.

As shown in these figures, four strain gauges R1, R2, R3 and R4 are provided on the rolling surface 6a of the rotating body 6,
Always one of the strain gauges is on the surface 2 of the lifting tape 2.
It is circumferentially provided at a constant interval so as to be in contact with a (see FIG. 13). Further, an electrode wire 25 electrically connected to the strain gauges R1 ... Is arranged on the rolling surface 6a, and this electrode wire 25 is electrically connected to an electrode 26 arranged on the processing circuit board 27. It is connected to the. The leaf spring 28 interposed between the rotating body 6 and the substrate 27 serves to press the electrode 26 on the substrate 27 against the electrode wire 25 on the rotating body 6.

The strain gauges R1, R2, R3 and R4 are
As shown in FIG. 14, a bridge circuit using 30 as a power source is configured. Therefore, as described above, when the contact pressure F becomes an abnormal value due to overload or the like, the resistance value of any of the strain gauges R1, R2, R3, and R4 becomes an abnormal value, and the equilibrium state of the bridge circuit is reached. Is broken, and this can be detected by the detection circuit 31, and the abnormality detection signal S
It can be output as 3.

As shown in FIG. 13, the strain gauges R1 ... Are covered with a protective insulating film 29 to improve durability.

The second embodiment has been described on the assumption of an apparatus capable of detecting an abnormality during the ascending / descending operation and further capable of detecting the ascending / descending position as in the first embodiment. However, as a second embodiment, it may be configured as a device that detects only an abnormality during lifting. In this case, it is possible to omit the provision of a device such as an encoder that converts the rotation amount of the rotating body to the up-and-down position.

In the embodiment described above, the case where it is applied to the blind 1 is assumed, but if the member to be lifted can be hung and lifted by a hanging member, a curtain, a roller blind, It can also be applied to take-up devices (winches, fishing rods, etc.), flag elevators, cranes, etc.

[0055]

As described above, according to the present invention, the rotating body is brought into contact with the hanging member, and the rotation amount of the rotating body is converted and output to the ascending / descending position of the lifted member. As described above, an error does not occur due to the rotational position of the shaft that winds the lifting tape, the degree of tightening of the tapes, and the like. Moreover, it does not impair the aesthetic appearance and is not affected by aging. Further, the length of the long suspension member does not increase the cost.

Further, according to the present invention, since the abnormality of the elevation is detected based on the detection result of the contact pressure of the rotating body, the abnormality of the elevation can be accurately detected.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of an embodiment of a lift position detecting device according to the present invention.

FIG. 2 is a block diagram showing a configuration of an elevation position control device applied to the embodiment.

FIG. 3 is a diagram showing a specific configuration example of the apparatus shown in FIG.

FIG. 4 is a diagram showing a modification of the device shown in FIG.

5 is a diagram showing a modification of the apparatus shown in FIG.

6 is a diagram showing a modification of the device shown in FIG.

FIG. 7 is a diagram showing a modification of the device shown in FIG.

FIG. 8 is a diagram showing a modification of the device shown in FIG.

FIG. 9 is a diagram showing a configuration of an embodiment of a lifting abnormality detecting device according to the present invention.

FIG. 10 is a diagram showing a specific configuration example of the device shown in FIG. 9.

11 is a flowchart illustrating a processing procedure when controlling the apparatus shown in FIG.

12 is a perspective view showing a configuration example of the pressure sensor shown in FIG.

13 is a view on arrow G in FIG. 12;

FIG. 14 is an equivalent circuit diagram of the device of FIG.

15 (a) and 15 (b) are diagrams used to explain the problems of the conventional technique.

[Explanation of symbols]

 1 Electric blind 2 Lifting tape 4 Slat 5 Bottom rail 6 Rotating body 8 Encoder 20 Pressure sensor

Claims (2)

[Claims] 1. An elevating position for detecting an elevating position of an elevating member when the elevating member is moved up and down by vertically moving a long hanging member on which the elevating member is suspended. In the detection device, a rotating body disposed by bringing a rolling surface into contact with the suspending member so as to be driven to rotate with the vertical movement of the suspending member, and a rotation amount of the rotating body, An up-and-down position detecting device comprising a conversion means for converting the up-and-down member into an up-down position. 2. An elevating and lowering device that detects an abnormal elevation of the lifted member when the lifted member is lifted by vertically moving a long hanging member on which the lifted member is suspended. In the abnormality detection device, a rotating body arranged with its rolling surface in contact with the suspending member so as to be driven to rotate in accordance with the vertical movement of the suspending member, the suspending member and the rotating body. Lifting abnormality including contact pressure detecting means for detecting contact pressure with the contact pressure detecting means and abnormality detecting means for outputting an abnormal signal by comparing the contact pressure detected by the contact pressure detecting means with a predetermined threshold value. Detection device.