JPH08177342A - Electric blind driving method - Google Patents

Abstract

PURPOSE: To promote the simplification of structure by performing the stopping, positioning and holding of a stepping motor with a gear head, rotating and driving a ladder code pulley, with the stopping torque alone of the motor and the gear head in a state of being unexcited. CONSTITUTION: A decelerating gear head is attached to a stepping motor 4 driving three lifting units 6, 7 and 8 of a blind 20 in a headbox 15, while in the case where it is made into a state of being unexcited, the stopping torque of the motor and the gear head alone is made so as to be larger than load due to weight of the blind 20. When this blind 20 is made to go up and down with the stepping motor 4, if this motor 4 is stopped, retention of the blind 20 at those of stopping, positioning and stopping positions is carried out without using a brake. With this constitution, structural simplification in this stepping motor 4 and its low-unit cost of production are well promotable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for driving an electric blind, and more particularly, for carrying out stop positioning and stop holding of a blind only by stopping torque of a motor body and a gear head of a non-excited stepping motor without using a brake. Regarding new improvements in.

[0002]

2. Description of the Related Art As a conventional electric blind driving method of this kind, a structure of a motor unit composed of a combination of a gear head, a stepping motor and a holding brake is generally used, and a signal from a control unit of a blind body is transmitted. The driver receives it and inputs a pulse to this motor to raise and lower the blind. Further, when the blind is stopped at an arbitrary position, the blind is stopped and held by an electromagnetic brake (which is released when excited) operated by the force of a spring when not excited. In addition, since the non-excitation operation is performed even during a power failure, the same stop and hold as described above was performed.

[0003]

Since the conventional electric blind drive method is configured as described above, the following problems exist. That is, since the electromagnetic holding brake must be provided in the motor section, the structure of the motor section becomes complicated, and a power source for releasing the holding brake is required when the motor is driven.

The present invention has been made in order to solve the above problems, and in particular, the blind stop positioning and stop holding are performed only by the stop torque of the stepping motor and gear head in the non-excited state without using a brake. It is an object of the present invention to provide an electric blind drive method that is performed.

[0005]

According to the blind driving method of the present invention, a blind is hung on a plurality of lifting units in a headbox via a ladder cord and a lifting tape, and the lifting units are driven by a stepping motor. In the electric blind driving method described above, the blind is stopped and positioned and stopped and held at a predetermined position only by a motor body of the stepping motor in a non-excited state and a gear head attached to the stepping motor.

[0006]

In the electric blind drive method according to the present invention, since the stop torque of the stepping motor and the gear head in the non-excited state is larger than the load when the blind is suspended, the stepping motor is moved at a predetermined position when the blind is moved up and down. By shutting off the excitation of the blind, the blind can be stopped and held at a predetermined position without using a conventional brake. Therefore, the conventional brake is not required, the structure of the motor part is simplified, and an inexpensive blind device can be obtained.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the electric blind driving method according to the present invention will be described in detail below with reference to the drawings. In FIG. 1, reference numeral 15 is a head box provided on a wall (not shown) or the like, and inside the head box 15, a plurality of lifting units 6, 7, 8 are arranged at predetermined intervals. The hoisting shaft 12 provided and connected to each of the lifting units 6, 7, and 8 has a pulley 6a,
7a and 8a are provided.

The bottom rail 14 and the slat 1 are attached to each of the pulleys 6a, 7a, 8a through the lifting tape 10 and the ladder cord 11 or only the ladder cord 11.
3 is suspended.

An end portion 12a of the winding shaft 12 is connected to a stepping motor 4 via a coupling 5, and a power cord 1 and a controller 2 are connected to the stepping motor 4 via a control circuit 3. There is. In addition, a rotation sensor (not shown) made up of a photo interrupter having a simple structure is built in the stepping motor 4, and a rotation signal of one rotation / one pulse method from the rotation sensor is input to the control circuit 3. Stepping motor 4
Is configured to be detected as normal or abnormal.

As shown in FIG. 2, the stepping motor 4 comprises a motor body 4a and a reduction gear head 4b connected to the motor body 4a, and a mounting screw 4c provided on the gear head 4b. It is fixed to the head box 15. Therefore, when the motor body 4a is in a non-excited state, the stop torque of only the motor body 4a and the gear head 4b is the blind (slat 1).
3, the bottom rail 14 and the like) 20 is increased so that the reduction ratio is larger than the load due to the weight, and the non-excitation torque is also increased. By being excited,
The blind 20 can be positioned and stopped at a predetermined position.

[0011]

Since the electric blind drive method according to the present invention is configured as described above, the following effects can be obtained. That is, without using the conventional brake, the blind can be stopped and positioned and stopped only by the stop torque of the motor body of the stepping motor and the gear head in the non-excited state (including power failure), and the structure of the stepping motor can be simplified. And cost reduction can be achieved. In addition, a power source for operating the brake is not needed, and labor can be saved.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an apparatus to which an electric blind driving method according to the present invention is applied.

FIG. 2 is an enlarged configuration diagram showing the stepping motor of FIG.

[Explanation of symbols]

 4 Stepping motor 4a Motor body 4b Gear head 6, 7, 8 Lifting unit 10 Lifting tape 11 Ladder coat 15 Head box 20 Blind

Claims (1)

[Claims] 1. A blind (20) is hung from a plurality of lifting units (6, 7, 8) in a head box (15) via a ladder cord (11) and a lifting tape (10) to provide the lifting unit. In the electric blind drive method in which (6,7,8) is driven by the stepping motor (4), it is attached to the motor body (4a) of the stepping motor (4) and the stepping motor (4) in the non-excited state. A method of driving an electric blind, characterized in that the blind (20) is stopped and positioned and stopped and held at a predetermined position only by the gear head (4b).