JP2002309868A - Power-assisted blind - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power-assisted blind which enables even a powerless user to conduct operations for ascent/descent of a relatively heavy Venetian blind, such as a wooden blind and a large blind for a high window, with agility by manual pulling. SOLUTION: In a method adopted by this blind (1), an operating cord (8), which is looped over an operating pulley (7), is pulled to rotate the operating pulley (7), rotation of the operating pulley (7) is transferred to an elevating mechanism (3) via a reduction gear (5), and the elevating mechanism (3) is rotated to make the blind (1) ascend/descend. A drive motor (6) is directly connected to an output shaft of the reduction gear (5), and a clutch (4) is interposed between the output shaft of the reduction gear (5) and the elevating mechanism (3). The blind (1) is provided with a control circuit (15) which rotates the drive motor (6) when the operating cord (8) is pulled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric assist blind for electrically assisting a manual operation of raising and lowering a blind.

[0002]

2. Description of the Related Art Hand-operated wooden venetian blinds and large venetian blinds for high windows are heavy. Therefore, reduction gears are used to reduce lifting and lowering operations. However, if the gear ratio is increased to reduce the force required for operation, , Operation time becomes longer,
There is a problem that operability becomes poor.

[0003] However, when such a venetian blind is completely electrically driven, there is a problem that it becomes very expensive.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve this problem, and the problem is that even a weak user can use a wooden venetian blind, a large venetian blind for high windows, and the like. It is an object of the present invention to provide an auxiliary system capable of manually lifting and lowering a heavy blind at a desired speed.

[0005]

In order to achieve the above-mentioned object, a means employed by the present invention is a blind of a system in which an operating code applied to a pulley for rotating a reduction gear is pulled to raise and lower the blind. An object of the present invention is to introduce a method of connecting a drive motor, controlling the drive motor in accordance with the operation direction and operation speed of the user, and assisting the raising and lowering operation of the blind with the drive motor.

For this reason, a detecting means for detecting the operation of the operation code is provided, and when the detecting means detects the ascending operation, the drive motor is started to rotate the blind in the ascending direction. At this time, when the operation speed detected by the detection means is higher than the set speed, the voltage of the drive motor is suppressed, and when it is lower, the voltage is increased. The set speed is preferably adjustable. When the detecting means detects the lowering operation, the drive motor is separated from the reduction gear to lower the blind by its own weight, or the drive motor is rotated in the blind lowering direction. The operation direction can be detected by providing limit switches on both sides of the operation code on the pulley. Non-contact sensors can also be used. The operation speed can be detected by a sensor that detects the number of rotations of the pulley per predetermined time.

Known lower limit position detecting means and obstacle stop detecting means are provided to stop the drive motor immediately when the blind comes into contact with the lower limit position or an obstacle.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A blind according to the present invention will be described based on an embodiment shown in the drawings.

FIG. 1 is a perspective view of a main part of an electric assist blind according to an embodiment of the present invention, and FIG. 2 is a principle view of the blind of FIG.

As shown in FIG. 1 and FIG.
The head box 2 has an elevating mechanism 3, a clutch 4 having an output shaft directly connected to an input shaft of the elevating mechanism, a reduction gear 5 having an output shaft directly connected to an input shaft of the clutch, and an output shaft of the reduction gear. A drive motor 6 directly connected to the output shaft is provided internally. An operation pulley 7 is fixed to an input shaft of the reduction gear 5 projecting from the head box 2, and an operation code 8 is hung on the operation pulley. An elevation detection switch 9 and an elevation detection switch 10 for detecting the elevation and descent of the operation code 8 are arranged in a part of the head box 2.

As shown in FIG. 2, the slack of the rotation speed detecting sensor 11 for detecting the rotation speed of the operation pulley 7 per predetermined time and the slack of the lifting cord 12 for hanging the blind indicate that the blind 1 has come into contact with the obstacle. An obstacle detection sensor 13 for detecting the object and a lower limit position sensor 14 for detecting that the blind 1 has reached the lower limit position are provided, and signals of these switches and sensors are input to the control circuit 15.

When the user pulls the operation code 8 to raise the blind 1, the lift detection switch 9 is turned on. When the rise detection switch is turned on, the control circuit 15
Rotates the drive motor 6 in a direction in which the blind 1 rises at a predetermined rising voltage, and simultaneously activates the rotation speed detection sensor 11 to receive a rotation speed signal from the rotation speed detection sensor 11. When the received rotation speed signal is higher than the set rotation speed, the voltage applied to the drive motor 6 is decreased, and when the received rotation speed signal is lower, the voltage is increased to keep the rising speed of the blind 1 constant. As described above, since the drive motor 6 assists the raising operation of the blind 1, the force for pulling the operation code 8 by the user to raise the blind 1 is greatly reduced.

In order for the user to descend the blind 1,
When the operation code 8 is pulled, the lowering detection switch 10 is turned on. At this time, if the blind 1 can be lowered by its own weight, the control circuit 15 disengages the clutch 4 and lowers the blind 1 by its own weight. If the blind 1 cannot be lowered by its own weight, the drive motor 6 is rotated in the direction in which the blind 1 is lowered at a predetermined voltage for lowering, and the rotation number detection sensor 1 is used.
1 is operated to receive the rotation speed signal. The blind 1 is lowered at a constant speed by adjusting the voltage applied to the drive motor 6 by comparing the reception speed signal with the set speed. The control circuit 15 immediately stops the rotation of the drive motor 6 when an obstacle detection signal is input from the obstacle detection sensor 13 or when a lower limit reaching signal is input from the lower limit detection sensor 14. The control circuit 15 is provided with a dial for adjusting the set number of revolutions for maintaining the vertical speed of the blind 1 at a desired constant speed and a display plate for the set value.

[0014]

As described above, the electric assist blind of the present invention is a system in which the manual operation of the blind is assisted by the drive motor.
It is possible to raise and lower relatively heavy blinds such as wooden blinds and large blinds for high windows at a constant desired speed. The effect is excellent.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of an electric assist blind according to an embodiment of the present invention;

FIG. 2 is a diagram showing the principle of the blind in FIG. 1,

[Explanation of symbols]

 1: Blind 2: Head box 3: Elevating mechanism 4: Clutch 5: Reduction gear 6: Drive motor 7: Operation pulley 8: Operation code 9: Up detection switch 10: Down detection switch 11: Rotation speed detection sensor 12: Up / down code 13: Obstacle detection sensor 14: Lower limit detection sensor 15: Control circuit

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2E043 AA01 AA04 AB01 BB11 BE04 BE06 BE12 BE14

Claims (5)

[Claims] An operation cord (8) hung on an operation pulley (7) is pulled to rotate the operation pulley, and the rotation of the operation pulley is transmitted to a lifting mechanism (3) via a reduction gear (5). In a blind of a type in which the blind (1) is raised and lowered by rotating the lifting / lowering mechanism, a drive motor (6) is directly connected to an output shaft of the reduction gear, and a clutch is provided between the output shaft of the reduction gear and the lifting / lowering mechanism. An electric assist blind, wherein a control circuit (15) for rotating the drive motor when the operation code is pulled is provided with (4) interposed therebetween. 2. An up / down detection switch (9, 1) for detecting that an operation code is pulled in an up / down direction.
0) is provided, and the control circuit (15) rotates the drive motor (6) in the ascending direction when the up detection switch is turned on, and rotates the drive motor (6) in the down direction when the down detection switch is turned on. 2. The electrically assisted blind according to claim 1, wherein the blind is disengaged or the clutch is disengaged. 3. A rotational speed sensor (11) for detecting the rotational speed of the operation pulley (7) per predetermined time is provided, and the control circuit compares the rotational speed detected by the rotational speed sensor with the set rotational speed to determine the driving motor. The electric assist blind according to claim 1 or 2, wherein the rotational speed of (6) is adjusted. 4. The electric assist blind according to claim 3, wherein the set rotation speed is adjustable. 5. A control system comprising an obstacle detection sensor (13) for detecting that the blind (1) has come into contact with an obstacle and a lower limit detection sensor (14) for detecting that the blind has reached a lower limit position. The electric assist blind according to any one of claims 1 to 4, wherein the circuit (16) stops the drive motor (6) when receiving a detection signal from the obstacle detection sensor or the lower limit detection sensor. .