JP2689122B2 - Curtain motor stop device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an improvement of a curtain motor stopping device, and more specifically, it will not move due to something being caught by the curtain when the opening and closing of the curtain is completed and during the opening and closing of the curtain. The present invention relates to a device that immediately stops a motor when it starts.

[Prior Art] A conventional device that not only automatically stops the motor of the curtain when the curtain is fully opened or closed but also stops the motor when an abnormality occurs during the opening and closing of the curtain As disclosed in No. 61-79421, a cord pulley is fitted to the drive shaft of the curtain motor, the detection pulley is brought into contact with the cord pulley, a magnet is attached to the detection pulley, and a hall element is provided in the bearing box of the detection pulley. The current supply to the curtain motor is stopped when the cycle of the output voltage of the hall element becomes slower than a predetermined value.

[Problems to be solved by the invention] When the curtain reaches the limit of opening and closing and the cord stops traveling, or when the curtain is caught by something while the cord is traveling and the cord stops traveling, the control circuit decelerates the cord pulley. Or, the curtain motor is stopped by detecting the stop, but a slight time lag from the stop of the running of the cord to the stop of the curtain motor is inevitable. In the conventional device, since the cord pulley was directly connected to the drive shaft of the curtain motor, the cord pulley rotates during the time lag to try to run the cord in a direction in which the cord cannot travel, so an excessive load acts on the cord. It was shortening the life of the cord. The present invention has been made to solve this, and an object of the present invention is to provide a device for stopping the rotation of the cord pulley at the same time as the traveling of the cord is stopped so that the curtain motor stops during the time lag. It is to prevent the cord pulley from forcibly running the cord.

[Means for Solving the Problems] Means adopted by the present invention to achieve the above object are a curtain rail, a curtain motor attached to the curtain rail, and a cord pulley connected to a drive shaft of the curtain motor. And a control circuit that detects the rotation speed of the cord pulley and stops the curtain motor when the rotation speed of the cord pulley falls below a predetermined speed, in which an elastic body is interposed between the drive shaft of the curtain motor and the code pulley. It is in.

As shown in FIG. 1 of the embodiment, a drive shaft 20 of a curtain motor 28 is provided with a key-shaped outer peripheral projection 22, and the radius of the shaft hole 11 of the code pulley 10 is formed slightly larger than the radius of the projection to drive the same. Fit the shaft 20 and attach the drive shaft 20 to the inner circumference of the cord pulley.
The inner peripheral projection 12 that engages with the outer peripheral projection 22 of
It is desirable to internally install a compression coil spring 25 in an arc-shaped space formed between the outer peripheral projection 22 and the outer peripheral projection 22.

[Operation] When the curtain reaches the opening / closing limit, or when something gets stuck while the curtain is opening / closing, the cord stops running. When the cord stops, the rotation of the cord pulley that runs the cord stops, and the control circuit that detects it stops the curtain motor. During the slight time lag between when the pulley stops and when the curtain motor stops, the torque of the curtain motor is compressed by the coil spring,
The cord pulley does not rotate. Unlike the conventional method, the cord pulley directly connected to the curtain motor does not overload the cord by forcibly sliding the stopped cord in the direction in which the cord cannot travel, so the cord has a long life. Significantly longer than.

[Example] An apparatus of the present invention will be described based on an example shown in the drawings. As shown in FIGS. 1 and 2, the cord pulley 10 is formed of a main body 14 and a flange 16, and a cord 30 is wound around an outer peripheral groove of the flange. The drive shaft 20 of the ultrasonic motor is inserted into the shaft hole 11 of the main body 14, and one key-shaped outer peripheral projection 22 is provided on the outer peripheral surface of the drive shaft. The inner radius of the shaft hole 11 is slightly larger than the radius of the outer peripheral projection 22. Shaft hole 11
A key-shaped inner peripheral projection 12 is also provided on the inner peripheral surface of the. A compression coil spring 24 is inserted into each of two arc-shaped voids in the shaft hole 11 formed by the inner peripheral projection 12 and the outer peripheral projection 22. Eight magnets 18 are fitted on one surface of the main body 14 at equal arc intervals. The Hall element 26 is arranged at a position facing the magnet 18. As shown in FIG. 3, the hall element 26 is fixed and supported inside the curtain rail 32, and the curtain motor 28 is fixed outside the curtain rail 32. The drive shaft 20 of the ultrasonic curtain motor 28 is a curtain rail 32.
The cord pulley 10 is supported by penetrating from outside to inside. Although not shown, a large number of curtain runners are slidably mounted inside the curtain rail 32, and the upper edge of the curtain 34 is mounted on the curtain runner. The leading curtain runner is locked to the cord 30, and the traveling of the cord 30 opens and closes the curtain 34. In order to regulate the opening / closing limit of the curtain 34, a stopper (not shown) for regulating the moving range of the leading runner is provided.

When the curtain motor 28 rotates, the outer peripheral protrusion of the drive shaft 20
22 is either one of the compression coil springs 24 depending on the rotation direction.
Since the inner peripheral projection 11 is pushed through the cord pulley 10 to rotate the cord, the cord 30 runs and the curtain 34 opens and closes. A compression coil spring is placed between the curtain motor 28 and the cord pulley 10.
Since 24 is interposed, a slight time lag occurs between the curtain motor 28 and the cord pulley 10 when starting and stopping the rotation.

Although not shown, the electric circuit of the curtain motor 28 includes an open button switch, a close button switch, and a stop button switch.When the open button switch is pressed, the curtain motor 28 rotates in the direction to open the curtain 34 and closes it. When the button switch is pressed, the curtain motor 28 rotates in the direction to close the curtain 34, and when the stop button switch is pressed, the curtain motor 28 stops.

As shown in FIG. 4, the control circuit calculates the speed of the code pulley by receiving the output signal of the hall element 26 that outputs a signal according to the strength of the magnetic field of the magnet 18 and the hall element, and A speed calculation circuit that outputs a corresponding signal,
When the signal from the speed calculation circuit is received, it is compared with the set value, and when it is smaller than the set value, a signal for activating the relay XS of the normally-closed open / close switch in series with the stop switch of the electric circuit is output. It consists of a comparison and determination circuit. This control circuit operates only when current is being supplied to the curtain motor.

When the close or open button switch is pressed, the curtain motor 28
Starts and rotates the cord pulley 10,
The rotation of the cord causes the cord 30 to run to open or close the curtain 34. When the curtain 34 reaches the open / close limit and the leading runner hits the stopper or the curtain 34 is caught by something, the leading runner cannot move, and the cord 30 stops running. Since tension is applied to the cord 30 and the sliding frictional resistance between the cord 30 and the cord pulley 10 is very large, when the cord 30 stops, the cord pulley 20 also stops rotating. The speed calculation circuit detects the rotation stop of the cord pulley 10 by the signal of the hall element 26, and the comparison determination circuit operates the relay XS by the signal of the speed calculation circuit to interrupt the current supply of the curtain motor 28. Will stop. There is a slight time lag from the stop of the cord pulley 10 to the stop of the curtain motor 28, during which the rotation of the drive shaft 20 of the curtain motor 28 is compressed between the outer peripheral projection 22 and the inner peripheral projection 12 of the code pulley 10. Since it is absorbed by the compression of the coil spring 24, after the traveling of the cord 30 is stopped, the curtain motor 28 rotates the cord pulley 10 during the time lag until the curtain motor 28 stops, and the cord 30 is forced to move in the direction in which traveling is impossible. Do not overload your vehicle to drive it.

Wear of the cord pulley 10 is prevented in advance. The detection of the rotation speed of the cord pulley 10 is not limited to the magnet and the Hall element, and any method can be used as long as it can be detected in a non-contact manner. For example, as shown in FIG. 5, a light emitter and a phototransistor can be used. In this case, open a plurality of through holes in the code pulley at equal arc intervals and arrange a light emitter on one side of the code pulley and a phototransistor on the other side, or install a plurality of mirrors on one side of the code pulley. The light emitter and the phototransistor may be arranged at arc intervals so that the phototransistor receives light reflected from the light emitter by the mirror. The curtain motor does not have to be limited to ultrasonic waves, and a known capacitor motor can be used. Although one inner protrusion and one outer protrusion are provided in the embodiment, two or more protrusions may be provided if necessary.

[Effects of the Invention] As described above, since the device of the present invention connects the drive shaft of the curtain motor and the code pulley via the elastic body, the control circuit detects the deceleration or stop of the code pulley and then stops the curtain motor. The rotation of the curtain motor is absorbed by the compression of the elastic body during the time lag until it is stopped, and the cord pulley does not forcibly rotate after it is stopped to apply an excessive load to the cord. Compared with the one in which the cord pulley is directly connected, the excellent effect that the life of the cord is significantly extended is obtained.

[Brief description of the drawings]

1 is a plan view showing a main part of an apparatus according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a curtain equipped with the apparatus of FIG. Is a partially cutaway front view, FIG. 4 is a block diagram of the apparatus of FIG. 1, and FIG. 5 is a view corresponding to FIG. 4 of another embodiment. In the figure, reference numeral 10 is a code pulley, 11 is a shaft hole, 12 is an inner peripheral protrusion, 18 is a magnet (control circuit), 20 is a drive shaft, 22
Is an outer peripheral protrusion, 24 is a compression coil spring (elastic body), 26 is a hall element (control circuit), 28 is a curtain motor, 32 is a curtain rail, and XS is a relay (control circuit).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshimitsu Honda 1-4-9 Shinkawa, Chuo-ku, Tokyo Tosoh Corporation (72) Inventor Hiroshi Onori 1-4-9 Shinkawa, Chuo-ku, Tokyo Tosoh Corporation

Claims (1)

(57) [Claims] 1. A curtain motor mounted on a curtain rail, a code pulley rotatably driven by the curtain motor mounted on the curtain rail, and a rotation speed of the code pulley detected to detect a predetermined rotation speed. A device comprising a control circuit for interrupting the current supplied to the curtain motor when the following is provided, wherein a key-shaped outer peripheral projection is provided on the outer peripheral surface of the drive shaft of the curtain motor,
A key-shaped inner peripheral protrusion is provided on the inner peripheral surface of the shaft hole of the cord pulley fitted on the drive shaft, and an elastic body is formed in an arc-shaped space formed between the outer peripheral protrusion and the inner peripheral protrusion in the shaft hole. A curtain motor stop device in which the curtain motor and the cord pulley are connected via the elastic body.