JPS6354866B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a blade angle control device for an electric blind that raises, lowers, and tilts the blades using a drive shaft rotated by a motor.

Conventionally, in such electric blinds,
In order to stop the blade at a desired angle, such as 45°, 90°, or 135°, a complex mechanism including multiple limit switches and control circuits corresponding to the desired angle was required.

The object of the present invention is to provide a blade angle control device that stops a blade at a desired angle with an extremely simple mechanism, and the blade is rotated by a motor to raise, lower, and tilt the blade. A clutch drum is fixed on the drive shaft, and a vane angle control disc is rotatably mounted approximately in the center of the clutch drum. A coil spring having an inner diameter slightly smaller than the diameter is installed, both ends of the coil spring protrude outward in the radial direction to form a pair of protrusions, and one protrusion is locked to the disk, A frame body that rotatably supports the clutch drum is provided with a pair of braking parts for regulating the rotation of the coil spring, and when the disc rotates to the final rotational position of one of the blades, one of the protruding parts moves to the braking part. When the disc rotates to the final position of the other vane, the other of the protrusions comes into contact with the other braking part to expand the coil spring. One or more actuating parts corresponding to a desired vane angle are formed on the disc, and a limit switch is provided which is actuated by the actuating part to stop the rotation of the motor. It is characterized by this.

This will be explained below with reference to the drawings.

1 and 2 show a lifting and tilting device for an electric blind equipped with a vane angle control device according to the present invention, and in the figures, 1 is a blind headbox, 2 is a blind vane, Reference numeral 3 denotes a ladder cord that supports the vane, 4 a lifting cord that raises and lowers the vane, 5 a drive shaft that raises, lowers, and tilts the vane, and 6 a motor that rotates the drive shaft.

The upper end of the rudder cord 3 is hung over the tilting drum 7, and the upper end of the elevating cord 4 is attached to the elevating drum 8. By rotating the drums 7 and 8 by the motor 6, the blades can be raised and lowered and tilted. is configured to do so. 9 shows an embodiment of the blade angle control device according to the present invention. As shown in an enlarged view in FIG.
, a clutch drum 11 fixed on the drive shaft 5 supported in the frame, a blade angle control disk 12 rotatably mounted on the clutch drum, and a blade angle control disk 12 rotatably mounted on the clutch drum. A coil spring 13 is provided which connects the disk 12 and the clutch drum 11, but interrupts the connection between the two when the blades are raised or lowered.

As clearly seen in the exploded perspective view of FIG. 4, the clutch spring 13 has one protrusion 13a.
, it is engaged in the notch groove of the disc 12.
The other protrusion 13b of the spring protrudes in the radial direction, and inside the frame 10, there is a
A braking portion 14a that acts against the end of the coil spring to loosen the spring when the disk 12 rotates until the rotation of the vane reaches its final position, as will be described later.
and 14b are provided.

In the illustrated example, the coil spring 13 is connected to the disk 1
A pair of coil springs are arranged on both sides of the drive shaft 5, and act in opposite directions depending on the direction of rotation of the drive shaft 5, but the desired purpose can be achieved even when these coil springs are integrated.

The blade angle control disk 12 is formed with one or more actuating parts corresponding to a desired blade angle, and is provided with a limit switch that is actuated by this actuating part to stop the rotation of the motor. .
In the illustrated embodiment, the vane angles are 0°, 45°, 90°,
It is adapted to be adjusted to 135° and 180°, and operating recesses 15b, 15c, and 15a are formed on the side surface of the disc 12 at positions corresponding to 45°, 90°, and 135°, and these limit switch 16b, 1 with an arm actuated by engaging recess 15;
6c and 16a are provided.

Next, the operation of the above device will be explained. FIG. 5 shows the control panel for the blind described above. For example, if the blade angle is to be set at 90 degrees, ie, in a horizontal device, the knob 17 on the control panel should be set at the 90 degree position. The motor 6 is then activated to rotate the drive shaft 5 and the disc 12 with it.
When the blade rotates to the 90° position, the tip of the arm of the corresponding limit switch 16c enters the recess 15c, stopping the rotation of the motor and the blade stopping at this angle. Next, if you want to set the vane at 135°, just set the knob 17 to the 135° position. As a result, as before, the motor 6 is driven to rotate the drive shaft 5, and the tip of the arm of the corresponding limit switch 16a enters the recess 15a, stopping the rotation of the motor, and the blade plate is rotated at 135 degrees. It will be stopped at the position. When raising and lowering the vane, the control disc 12 is rotated by the drive shaft 5 until the vane reaches its final rotational position, that is, until the vane reaches the 0° or 180° position. As shown in FIG.
a or 14b, and the subsequent rotation of the drive shaft 5 acts to loosen the coil spring 13, so the vane angle control disk 12 and clutch drum 11 become free and the rotation of the drive shaft is controlled. The blind blades are raised and lowered by rotating the lifting drum without being transmitted to the disc.

As described above, the present invention is an electric blind of the type in which the blades of the blind are raised, lowered, and tilted by a single drive shaft, and the blades can be stopped at a desired angle using an extremely simple mechanism. In addition, the blind can be raised and lowered, and therefore a complicated mechanism or complicated circuit as in the conventional method is not required, so there are few failures and a blade angle control device is provided at a low cost.

[Brief explanation of drawings]

1 and 2 are a side view and a plan view showing the elevation and tilting positions of the vanes of an electric blind equipped with a vane angle control device according to the present invention, and FIGS. 3 and 4 are according to the present invention. Enlarged side view and exploded perspective view showing one embodiment of the vane angle control device, No. 5
The figure is a front view showing the control panel of the blind, and FIGS. 6 and 7 are explanatory diagrams showing the operation of the blade angle control device. 1... Head box, 2... Wing plate, 3... Rudder cord, 4... Lifting cord, 5... Drive shaft,
6...Motor, 7...Tilt drum, 8...Elevating drum, 9...Blade angle control device, 10...Frame body,
11...Clutch drum, 12...Blade angle control disc, 13...Coil spring, 14a, 14
b...Brake part, 15...Operating recess, 16...Limit switch, 17...Knob.

Claims (1)

[Claims] 1. A clutch drum is fixed on a drive shaft rotated by a motor to raise and lower and tilt the vanes, and a vane angle control disk is rotatably mounted approximately in the center of the clutch drum. Coil springs having an inner diameter slightly smaller than the outer diameter of the clutch drum are attached to the parts protruding from both sides of the disc, and both ends of the coil springs protrude outward in the radial direction to form a pair of protrusions. and locking one protrusion to the disc,
The frame body that rotatably supports the clutch drum has
A pair of brake parts are provided to restrict the rotation of the coil spring, and when the disc rotates to the final rotational position of one of the blades, one of the protrusions comes into contact with one of the brake parts to expand the coil spring. , and when the disk rotates to the final rotational position of the other vane, the other of the protrusions abuts the other braking section to expand the coil spring, and on the disk, one corresponding to the desired vane angle,
Alternatively, a blade angle control device for an electric blind, comprising a plurality of actuating parts and a limit switch that is actuated by the actuating parts to stop the rotation of the motor.