JPH0462288A - Motor driven venetian blind - Google Patents

Abstract

PURPOSE:To make it possible to raise and lower a blind without changing inclination of slats by making a ladder-drum remain stopped during the rising and falling of the blind. CONSTITUTION:When a blind is raised and lowered, an electromagnetic clutch is turned OFF to erase the magnetism of a coil 37, and the transfer of rotation from the first rotary shaft 11 to the second rotary shaft 12 is interrupted. Then, a motor 13 is rotated to rotate a rising and falling drum 15, and a rising and falling tape 16 is wound up or down to raise and lower the blind. At that time, the second rotary shaft 12 remains stopped, a ladder-drum 20 connected through gearings 23, 24 and 25 also remains stopped, so that the inclination of slats 18 remains unchanged. During the rising and falling of the blind, the rising and falling tape 16 does not scratch the circumferential edge of a rising and falling tape hole 19 of the slat 18, so that the slat 18 is not vibrated, the rising and falling tape 16 is not worn, and the front and the rear edges of both up and down slats 18 do not come into collision so that noises do not occur. According to the constitution, the blind can be raised and lowered smoothly and calmly.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to improvements in electric Venetian blinds.

[Prior Art] In an electric Venetian blind in which the rotating shaft of the blind is rotationally driven by a motor, as disclosed in Japanese Patent Publication No. 2-6917, the lifting drum that winds the lifting cord or tape rotates integrally with the rotating shaft. However, the rudder drum that tilts the slats back and forth is slipably attached to the rotating shaft. When the motor is rotated normally and the blind is raised or lowered, the rudder drum rotates with the rotating shaft until it hits the stopper, and then slips. However, since the lifting drum rotates together with the rotating shaft, the slats do not move while the blind is being raised or lowered. The slope is always close to the vertical limit.

[Problems to be Solved by the Invention] Conventional Novenetian blinds always have their slats oriented at the near-vertical inclination limit when going up and down.

There was a problem in which the light environment in the room became abnormal when the blinds were raised and lowered0. For example, when trying to raise the blinds in a room where the blinds have been lowered and dimmed, all the slats become vertical and the interior lights up for a moment. Get dark.

When the blind is raised and lowered, the lifting cord passes through the lifting cord hole of each slat, but since each slat is nearly vertical, the lifting cord rubs against each lifting cord hole. As a result, there was a problem in that the slats caused slight vibrations and the lifting cords were worn out.

When the slats are vertical when going up and down, there is a problem in that the front and rear edges of the upper and lower slats collide with each other, creating a harsh noise.

The present invention has been made to solve the above problems, and its purpose is to provide an electric Venetian blind that can be moved up and down without changing the inclination of the slats.

[Means for Solving the Problems] In order to achieve the above object, the means adopted by the present invention includes a head box, a first rotating shaft rotatably supported by the head box, and a first rotating shaft that is rotatably supported by the head box. A rotating motor, an elevating drum holder attached to the head box, an elevating cord or tape wrapped around the elevating drum, and a ladder drum holder fixed to the head box.
a ladder drum supported coaxially with the elevating drum by the ladder drum holder; a ladder cord or tape having an upper end attached to the ladder drum; and each slat supported by the ladder cord and tilting back and forth as the ladder drum rotates; In an electric Venetian blind equipped with a lowermost slat that is suspended from a lifting cord or tape wrapped around the lifting drum and is raised and lowered by the rotation of the lifting drum, the head is connected to the second rotation axis parallel to the first rotation axis. A rotation transmission means that is attached to the box and includes an electromagnetic clutch between the first rotation shaft and the second rotation shaft is provided, and a rotation transmission mechanism that transmits the rotation of the second rotation shaft to the rudder drum is provided.

[Operation] When the first rotating shaft is rotated, the lifting drum rotates and winds up or lowers the lifting cord or tape, so the lowermost slat moves up and down and the blind opens and closes. If the electromagnetic clutch of the one-rotation transmission means is disengaged at this time, the rotation of the first rotation shaft is not transmitted to the second rotation shaft, and the second rotation shaft remains stopped.

That is, since the ladder drum remains stationary while the blind is being raised and lowered, the inclination angle of the slat remains unchanged throughout. Therefore, unlike conventional blinds, when the blind is being raised or lowered, the slats are close to the vertical limit of inclination, so the light environment may suddenly change, or the lifting cord or tape may rub against the edge of the slat's lifting cord or tape hole, causing the blind to rise or lower. All phenomena such as abrasion of the cord or tape, vibration of the slats, and noise caused by collision between the front and rear edges of the upper and lower slats are all prevented.

[Example] The apparatus of the present invention will be explained based on embodiments shown in the drawings.

As shown in FIGS. 1 and 2, first and second rotating shafts 11 and 12 are provided in parallel in the head box 10 of the blind, and the first rotating shaft 11 is rotationally driven by a motor 13. The first rotating wheel 11 has the center of the cross section of the head box 10,
The upper corners of the cross section of the head box 10 extend in the longitudinal direction to the second rotation shaft 12, respectively.

An elevating drum 15 is fixed to the first rotating wheel 11, and an elevating tape 16 is wound around the elevating drum. Lifting drum 1
5 is supported by an elevating drum holder 17 fixed to the head box 10.

The rudder drum 20 is rotatably attached to a rudder drum holder 21 fixed to the head box 10, and the center of rotation of the rudder drum 20 coincides with the first rotating wheel 11. The upper end of a ladder cord 22 is fixed to the ladder drum 20. The lower end of the lifting tape 1B passes through the lifting cord hole 13 of each slat l-18 and is fixed to the bottom rail, which is the lowermost slat 18. Ladder cord 22 supports each slat 18 threaded through the weft. The elevating drum holder and the ladder drum holder may be separate or integrated.

A driving gear 23 is attached to a portion of the second rotating shaft 12 that passes through the rudder drum holder 21 so as to rotate therewith, and a driven gear 24 is attached to the rudder drum 20 integrally.

An intermediate gear 25 connecting the driving gear 23 and the driven gear 24 is pivotally supported on the rudder drum holder 21.

Zero rotation transmission means 30 in which a rotation transmission means 30 including an electromagnetic clutch is interposed between the first rotation shaft 11 and the second rotation wheel 12
As shown in FIG. 3, the first and second rotating shafts 11.1
A main gear 32 is fixed to the first rotating shaft 11 within the frame. The rotation of the main gear 32 is transmitted to the slave gear 3 via an idle gear 33 pivotally supported by the frame 31.
4. The follower gear 34 is rotatably fitted onto a follower gear receiver 35 fixed to the second rotating shaft 12 . Follow gear 3
The coil 37 of the electromagnetic clutch is located outside the center of the extension part 36 of 4.
is disposed, and a magnet body 38 of an electromagnetic clutch integrally formed with the follower gear 34 is located around the open end of the coil. A drive-side shaft body 40 as an armature of the electromagnetic clutch is fitted onto the extension portion 3B of the slave gear 34 so as to be movable in the axial direction and mutually rotatable, and the drive-side shaft body 40 is moved away from the magnet body 38 by a spring 39. When the coil 37 is energized and excited, the armature's driving side shaft body 40 comes into close contact with the magnet body 3B against the spring 39 due to the magnetic force, and the cylindrical driven side shaft body 45 that rotates together with the driven gear 34 rotates. 82 is fixed to the rotating shaft 12 at a position following the drive-side shaft body 40 .

A brake cylinder 42 coaxially protrudes into the driven shaft body 45.
is formed integrally with the frame body 31, and a brake spring 43 is externally fitted onto the brake body. A slit 46 is formed in the peripheral wall of the driven side shaft body 45, and a projection 41 that projects in the axial direction is provided on the disc-shaped drive side shaft body 40 that protrudes from the slit so as to intersect both ends of the brake spring 43. The protrusion 41 is inserted into the slit 46 and placed between both protruding end openings of the brake spring 43. When the drive side shaft body 40 rotates, the protrusion 41
Since the brake spring 43 is always relaxed from the brake body 42, the rotation of the driving shaft 40 is transmitted to the driven shaft 45. However, when the driven side shaft body 5 tries to rotate with respect to the drive side shaft body 40, the slit 4
Since the brake spring 43 is always fastened to the brake body 42, rotation from the driven shaft body 45 is prevented.

In this way, the rotation transmission means 30 transmits the rotation of the first rotation shaft 11 to the second rotation shaft when the electromagnetic clutch is on,
When the electromagnetic clutch is off, rotation from the driven shaft body 45 is blocked by the brake spring 43, so even if an external force acts on the slat 18, the second rotating shaft 12 does not rotate.
The inclination angle of the slat 18 remains unchanged.

When the blind moves up and down, the electromagnetic clutch is turned off, the coil 37 is demagnetized, and the coil 37 is moved from the first rotating shaft 11 to the second rotating wheel 1.
The rotation transmission to 2 is interrupted. Next, the motor 13 is rotated to rotate the lifting drum 15 to wind up or lower the lifting tape 16 to lift or lower the blind. At this time, the gear ring 12 remains stationary on the second rotating shaft, and the gear ring 2
Since the rudder drum 20 connected via 3.24.25 also remains stationary, the inclination of the slat 18 remains unchanged throughout. Therefore, while the blind is being raised and lowered, the raising and lowering tape 1B is inserted into the raising and lowering tape hole of the slat 18! Since the peripheral edges of the slats 8 are not rubbed, the slats 18 do not vibrate, the lifting tape 16 wears, and the front and rear edges of the upper and lower slats 18 do not collide to generate noise.

When adjusting the inclination of the slur 18, the electromagnetic clutch is turned on to excite the coil 37 and transmit the rotation of the first rotating shaft 11 to the second rotating shaft 12. Drive the motor 13 to
Then, the second rotating shafts 11 and 12 are slowly rotated to adjust the inclination angle of the slats 18. At this time, the first rotating wheel 11
The blinds move up and down slightly as the blinds rotate.

[Effects of the Invention] As described above, the blind of the present invention is different from the conventional blind in which the slat always rotates to the inclination limit and becomes nearly vertical when going up and down, but the inclination of the slat remains unchanged throughout the blind going up and down. The indoor light environment may suddenly change when raising and lowering the blind, the lifting cord or tape may rub against the slats and cause them to vibrate, the lifting cord or tape may become worn, or the front and rear edges of the upper and lower slats may collide with each other. All phenomena that cause unpleasant noises are eliminated, and the blinds move up and down smoothly and quietly, providing an excellent effect.

1 rotation shaft, 12 is the second rotation shaft, 13 is the motor, 15 is the lifting drum, 1B is the lifting tape, 17 is the lifting drum holder, 18 is the slat, 20 is the ladder drum, 21 is the ladder drum holder, 22 is the ladder hood , 23 is a drive gear,
24 is a driven gear, 30 is a rotation transmission means, 37 is a coil,
38 is a magnet, 38 is a spring, 40 is a driving shaft, 41 is a protrusion, 42 is a brake body, 43 is a brake spring, and 45 is a driven shaft.

Claims (1)

[Claims] 1) a head box (10), a first rotating shaft (11) rotatably supported by the head box, and a first
A motor (13) that rotationally drives a rotating shaft, an elevating drum holder (17) fixed to the head box, and an elevating drum (15) attached to the elevating drum holder so as to rotate integrally with the first rotating shaft. ), a lifting cord or tape (16) wound around the lifting drum (15),
The rudder drum holder (
21), a ladder drum (20) attached to the ladder drum holder coaxially with the lifting drum, a ladder cord (22) or tape whose upper end is supported by the ladder drum, and a ladder drum (20) that is mounted on the ladder drum holder coaxially with the lifting drum; a ladder cord (22) or tape whose upper end is supported by the ladder drum; The slats (which are supported by the ladder cord and tilt back and forth)
18) An electric Venetian blind comprising:
A second rotating shaft (12) is provided in the head box parallel to the first rotating shaft, and an electromagnetic clutch (37, 38, 39, 40) transmits the rotation of the first rotating shaft to the second rotating shaft.
), the rotation transmitting mechanism (2) transmitting the rotation of the second rotation shaft to the rudder drum.
3, 24, 25)).