JP4097631B2 - Electric blind control device - Google Patents

Description

  The present invention relates to a control device for an electric blind.

  Conventionally, as a control device of this type of electric blind, one described in Patent Document 1 (Japanese Patent Laid-Open No. 64-62587) is known. In the control device described in this publication, detection means for detecting the height position of the blind, lower limit value setting instruction means for the user to set a lower limit value for lowering the blind, and lowering of the blind A storage means for storing a lower limit value, and a position detected by the detection means in accordance with a command from the lower limit value setting command means is stored in the storage means as a lower limit value, and when the lowering command is given from the outside, the detection means And a control means for controlling the motor to stop when the detected value and the lower limit value match by rotating the motor until the detected value matches the lower limit value stored in the storage means. Thereby, the current height position when instructed by the user from the lower limit value setting command means can be detected and stored as the lower limit position, and the lower limit position can be set.

  The detection means of the control device detects the height position by detecting the amount of rotation of the drum that winds and unwinds the lifting tape (lifting member) that lifts and lowers the blind. Specifically, a photo interrupter as detection means outputs a pulse signal at every predetermined rotation angle of the drum, and the height data is obtained by the control means counting this pulse signal. When the count value of the pulse signal reaches the value set as the lower limit position, it is determined as the lower limit position, the drive of the motor is stopped, and the blind stops descending.

  However, when the lifting tape is stretched due to a change with time, there is a problem that the relative height data obtained by the detecting means for detecting the rotation amount of the drum causes an absolute height and a deviation. .

  In other words, even if a certain upper limit position is initially set as height data = 0 (initial value), the position where height data = 0 obtained from the signal of the detection means by the subsequent stretching of the lifting tape is the upper limit position. It will fall below the position. Thus, the height data based on the detection means represents a height below the actual height, and the lower limit position determined based on the height data obtained from the detection means is also shifted downward from the initially set position. There is a problem that.

JP-A-64-62587

  The present invention has been made in view of such a problem, and even if there is a change in the length of the elevating member due to aging, the difference between the height data obtained by detecting the amount of rotation of the drum and the absolute height. It is an object of the present invention to provide an electric blind capable of reducing the size of the screen and stopping the shielding material at a desired height.

In order to achieve the above-mentioned object, the invention according to claim 1 is a control device for an electric blind that can lift and lower a shielding member by winding and unwinding a lifting member around a drum by driving a motor.
A height detecting means for detecting and outputting the rotation amount of the drum;
An upper limit switch that mechanically detects that the shielding material is in the upper limit position and outputs an upper limit position signal;
An initial position setting processing means for setting height data to an initial value when the upper limit switch outputs an upper limit position signal;
The shielding material with raising operation, when increasing operation obtains the current height data based on the rotation amount of the drum detected by the height detecting unit, and the current height data equal to the initial value limit If the upper limit position signal from the limit switch is not output, the initial irrespective to the upper limit position signal from the upper limit switch is output, the current height data on the detection of the rotation amount drum from the height detecting means A rising processing means for stopping the shielding material when the upper limit switch outputs an upper limit position signal ,
It is characterized by providing.

According to a second aspect of the present invention, when the rising processing means according to the first aspect outputs an upper limit position signal from the upper limit switch even though the current height data is not equal to the initial value, The rising of the shielding material is stopped, and the height data obtained based on the rotation amount of the drum is kept as it is without setting the current height data to the initial value.

  According to the present invention, at the time of initial setting, after the height data when the upper limit switch mechanically detects that the shielding material is in the upper limit position is set as the initial value, the lifting member is elongated due to secular change. Even if the height data obtained based on the rotation amount of the drum detected by the height detection means may become the initial value even though the upper limit position has not been reached, the upper limit from the upper limit switch Since the height data is maintained at the initial value until the position signal is output, the influence of the extension of the elevating member can be eliminated. By obtaining the current height data based on the amount of drum rotation from the height detection means with the upper limit position as the initial value, variations in height data can be prevented and errors with absolute height can be reduced. Thus, the shielding material can be stopped at a desired height.

  According to the invention described in claim 2, when the current height data is not equal to the initial value due to a defect in the lifting / lowering condition of the shielding material rather than the influence of the lifting / lowering member elongation, the upper limit position is reached. Since this is a temporary thing, the influence by the defect in the raising / lowering condition of a shielding material can be excluded by making the height data at that time into the initial value.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing an example of an electric blind 10 controlled by the electric blind control device according to the present invention. As the electric blind, any blind can be used as long as it can raise and lower the shielding material by winding and unwinding the lifting member with a drum by driving the motor. It is a horizontal blind made of slats. That is, a plurality of ladder cords 12 are suspended from the head box 11, and a large number of slats 14 and bottom rails 15 are supported by the ladder cords 12 in an aligned state. In addition, an elevating tape 16 that is an elevating member is suspended from the head box 11, and the elevating tape 16 is connected to a bottom rail 15 below the slat 14 through each slat 14.

  The upper ends of the vertical cords before and after the ladder cord 12 are connected to a rotating drum 18 in the head box 11, and the upper ends of the elevating tape 16 are connected to the elevating drum 20 in the head box 11 so as to be wound and unwound. Is done. A shaft 22 extending in the longitudinal direction passes through each of the rotary drum 18 and the lifting drum 20 in the head box 11. The shaft 22 is rotationally driven by a motor 24 disposed in the head box 11.

  The rotary drum 18 is connected to the shaft 22 via a clutch spring, and rotates with the shaft 22 within a predetermined angle range, while the elevating drum 20 cannot rotate relative to the shaft 22. , It always rotates together with the shaft 22. Therefore, when the motor 24 is driven to rotate the shaft 22 in a predetermined direction, the rotary drum 18 and the lifting drum 20 are rotated in the same direction. When the rotating drum 18 rotates to a predetermined angle, further rotation is prevented, and the rotating drum 18 rotates idly with the shaft 22 by the clutch spring. As the rotating drum 18 rotates, a relative motion is generated between the vertical cords before and after the ladder cord 12 so that the slat 14 rotates. The predetermined angle at which the rotating drum 18 can rotate is the slat. 14 rotation angles are supported.

  Further, when the elevating drum 20 rotates, the elevating tape 16 is wound around the elevating drum 20 or unwound from the elevating drum 20 according to the rotation direction, and the bottom rail 15 and the slats 14 are raised or lowered. It can be done.

  As shown in FIG. 2, the control device 28 for controlling the electric blind 10 includes a control circuit 30 constituted by a microprocessor, an encoder 32, a mechanical upper limit switch 34, a controller 36, and a motor drive. Circuit 50.

  The encoder 32 detects the rotation of the shaft 22 and the lifting drum 20, and includes a rotating plate with a slit that rotates together with the shaft 22, and a photo interrupter provided so as to sandwich the rotating plate. From the photo interrupter, the shaft 22 Each time a slit formed in the rotating plate passes corresponding to the predetermined rotation angle, a pulse signal is output. The control circuit 30 counts the output pulse signal from the encoder 32, and obtains the current elevation height position of the slat 14 by the counted value.

  The mechanical upper limit switch 34 is provided so as to protrude from the bottom of the head box 10 (see FIG. 1), and the slat 14 rises and the uppermost slat 14 contacts the upper limit switch 34. Then, a detection signal is generated.

  Further, the controller 36 has switches for instructing various operations of the blinds, and includes an ascending switch 38 for instructing raising of the slats, a stop switch 40 for instructing stopping, and a lowering switch 42 for instructing descending. , A rotation switch 44 for instructing rotation of the slats, a rotation switch 46 for instructing reverse rotation of the slats, and a lower limit position setting switch 48 for setting the lower limit position.

  The motor drive circuit 50 rotationally drives the motor 24 in either the forward or reverse direction based on the motor drive signal from the control circuit 30.

  Signals from the encoder 32, the upper limit switch 34, and the controller 36 are input to the control circuit 30, and a motor drive signal is output to the motor drive circuit 50 based on the results of processing by the following processing means. That is, the control circuit 30 includes operation processing means including an electric blind control processing means 30A, an initial position setting processing means 30B, a lower limit position setting processing means 30C, an ascending processing means 30D, and a descending processing means 30E. The means performs processing based on the flowcharts shown in FIGS.

  First, in the initial position setting process, as shown in FIG. 4, the motor 24 is driven to raise the slat 14 (step S12), and the slat 14 is raised to the maximum until the upper limit switch 34 is turned on. (Step S14), height data representing the elevation position in that state is set to 0 (initial value) (step S16). Thus, in the initial position setting, the mechanical upper limit position of the slat where the upper limit switch 34 operates is set as the initial position.

  Next, the lower limit position is set. In the lower limit position setting, as shown in FIG. 5, the motor 24 is driven to lower the slat 14 (step S22). During this descent, the signal pulses from the encoder 32 are counted and the height data is incremented (step S24). When the desired lower limit position is reached, the slat 14 is stopped by turning on the stop switch (step S26). When the lower limit position setting switch 48 is turned on at this height position (step S28), the current height data (X) is stored in the memory as the lower limit height data (step S30). Thus, a desired arbitrary height position can be set as the slat descending position.

  Thereafter, when various switches such as the raising switch 38, the lowering switch 42, the rotation switches 44 and 46, and the stop switch 40 serving as the slat operation switches of the controller 36 are turned on by the electric blind control process shown in FIG. Action is taken.

  For example, when the lowering switch 42 is turned on, as shown in FIG. 6, the motor 24 is driven to lower the slat 14 (step S32), the signal pulses from the encoder 32 are counted, and the height data is obtained. It is incremented (step S34), and it is determined whether the height data is equal to the lower limit height data X (step S36). If equal, it indicates that the lower limit position has been reached, so the motor is stopped and the slat 14 is stopped (step S38). If, for example, a stop switch or the like is turned on before reaching the lower limit position, the slat 14 can be stopped at that position, and the slat 14 can be held at an arbitrary height position.

  When the ascent switch 38 is turned on, as shown in FIG. 7, the motor 24 is driven to raise the slat 14 (step S42), the signal pulses from the encoder 32 are counted, and the height data is decremented. Then, it is determined whether or not the upper limit switch 34 is turned on (step S46), and then it is determined whether or not the height data = 0 (step S48).

In Ideally, upper limit switch 34 at the initial position setting as is supposed to be the height data = 0 when turned ON, in fact, the upper limit limit switch 34 is turned ON Nevertheless, the height data may not be zero. For example, when the ladder cord 12 is sandwiched between adjacent slats 14 due to the folding of the slats 14 when the slats 14 are raised, the slats 14 have a large folding margin and the height data is greater than zero. This is because the uppermost slat 14 may come into contact with the upper limit switch 34. In this case, the drive of the motor 24 is stopped and the slat 14 is stopped (step S60). However, since it is a transient failure, the height data is not changed and is not 0 (greater than 0). Value).

  On the other hand, although the upper limit switch 34 is not turned on, the height data may be zero. This occurs when the elevating tape 16 is stretched due to aging. In such a case, the ascending operation of the slat 14 is continued (step S50), the height data = 0 (step S52), the upper limit switch is turned on (step S54), or another switch is turned on. (Step S56), the ascending operation is continued. When the upper limit switch is turned on, the height data is set to 0 (step S58), the drive of the motor 24 is stopped, and the slat 14 is stopped.

  As a result, even when the elevating tape 16 is stretched, the position where the upper limit switch 34 is turned ON is reset as height data = 0 each time the slat 14 is moved up to the upper limit. Next, when the slat 14 is lowered, the signal pulse from the encoder 32 is incremented from the position where the uppermost slat 14 contacts the upper limit switch 34, and the position lowered by X is set to the lower limit position. It can be. In this way, the lower limit position can be held at the set height position regardless of the elongation of the lifting tape 16.

  In step S46 described above, the reason why the height data is not 0 when the upper limit switch 34 is ON has been described as being due to a poor convolution of the slat 14, but in addition to this, It can also be caused by the lifting tape 16 shrinking due to aging. In such a case, the phenomenon that the upper limit switch 34 is continuously turned on before the height data becomes 0 continues, so when this is detected and the upper limit switch 34 is turned on. In addition, by resetting the height data to 0, it is possible to cope with a case where the elevating tape 16 is contracted in the same manner as when it is extended.

It is a whole block diagram of the electric blind controlled by the control apparatus of this invention. It is a block diagram of the control apparatus of this invention. It is a main flowchart showing blind control. It is a flowchart showing an initial position setting process. It is a flowchart showing a descent | fall position setting process. It is a flowchart showing a descent | fall process. It is a flowchart showing a raise process.

Explanation of symbols

10 Electric blind 14 Slat (shielding material)
16 Lifting tape (lifting member)
20 Lifting drum 24 Motor 28 Control device 30B Initial position setting processing means 30D Ascending processing means 32 Encoder (height detection means)
34 Upper limit switch

Claims (2)

A control device for an electric blind capable of lifting and lowering a shielding material by winding and unwinding a lifting member on a drum by driving a motor,
A height detecting means for detecting and outputting the rotation amount of the drum;
An upper limit switch that mechanically detects that the shielding material is in the upper limit position and outputs an upper limit position signal;
An initial position setting processing means for setting height data to an initial value when the upper limit switch outputs an upper limit position signal;
The shielding material with raising operation, when increasing operation obtains the current height data based on the rotation amount of the drum detected by the height detecting unit, and the current height data equal to the initial value limit If the upper limit position signal from the limit switch is not output, the initial irrespective to the upper limit position signal from the upper limit switch is output, the current height data on the detection of the rotation amount drum from the height detecting means A rising processing means for stopping the shielding material when the upper limit switch outputs an upper limit position signal ,
A control device for an electric blind, comprising: When the upper limit position signal is output from the upper limit switch even though the current height data is not equal to the initial value, the ascent processing means stops the raising of the shielding material and the current height data. 2. The control device for an electric blind according to claim 1, wherein the height data obtained based on the amount of rotation of the drum is kept as it is without setting the data as an initial value.

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