JP2902255B2 - Electric blind stop position adjusting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric blind stop position adjusting device.

[0002]

2. Description of the Related Art A conventional stop position adjusting device for an electric blind is disclosed in Japanese Patent Publication No. 53-22791. In the electric blind shown in this figure, a hollow screw shaft having one end connected to a rotating shaft rotated by a motor is rotatably supported on both side plates of the frame pair. The female screw of the locking piece is engaged with the hollow screw shaft. The small-diameter screw shaft is also rotatably supported on both side plates. On the small diameter screw shaft, two adjusting nuts for adjusting the upper and lower limit operation positions of the respective limit switches, and female screws of the pressing pieces are respectively engaged with the ends of the shaft more than the adjusting nut. Each pressing piece can press an ascending limit switch and a descending limit switch, respectively. The ascending limit switch and the descending limit switch are connected by a cable. A notch is formed in the frame so that the adjustment nut can be adjusted from outside.

[0003]

However, in the above-mentioned conventional electric blind, an extra length of cable is used between the up and down limit switches in order to adjust these positions. When the locking piece moves in the axial direction with the rotation of the hollow screw shaft, there is a problem that the locking piece is caught on the cable and causes disconnection or poor contact. Further, since the adjustment of the contact position between the pressing piece and the limit switch is performed by moving the adjustment nut, it must be operable from outside the headbox in order to move the adjustment nut. For this reason, there is a problem that a hole must be provided in the head box. The present invention is to solve such a problem.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems by connecting each limit switch by a conductive plate fixed to a limit switch case. That is, the stop position adjusting device for an electric blind according to the present invention includes a lifting cord (1) capable of moving up and down the blind (12).
8) a rotary drum (20) having one end connected to be capable of winding and unwinding; a motor (24) capable of driving the rotary drum (20) to rotate via a rotary shaft (22);
In a device in which a stop position adjusting device or the like capable of controlling the drive of the limit switch case is disposed in the head box (10), the limit switch case (26) has three
The two conductive plates (32, 34, 36) are provided in parallel, and the first conductive plate (32) located in the center and one conductive plate (32) adjacent thereto are provided with the first conductive plate (32).
The limit switch (38) is in contact with the second limit switch (4) between the conductive plate (34) located at the center and the other conductive plate (36) adjacent thereto.
0) is in contact with each of the limit switches (3
8 and 40), the internal threads formed on these two external threads formed on the outer circumference of two rotatable adjusting shafts (48, 50) extending in the longitudinal direction of the limit switch case (26) One end of the adjustment shaft (48, 50) is connected to an adjustment dial (52, 5) provided outside the limit switch case (26).
The movable body (58) that can be brought into contact with these limit switches (38, 40) is provided so as not to rotate but to be movable in the axial direction between the limit switches (38, 40). The movable body (58) has a female screw formed on the outer circumference of a rotatable screw shaft (58) extending the entire length in the longitudinal direction of the limit switch case (26). The screw shaft (58) is engaged with the rotary shaft (22) so as to rotate integrally therewith. The limit switch case (26) may be installed such that the adjustment dials (52, 54) protrude outside from the end of the headbox (10).

[0005]

When the rotary shaft is driven to rotate by the motor, the screw shaft in the limit switch case is rotated and guided by this, the moving body moves in a predetermined direction according to the rotation direction of the screw shaft. To activate it. As a result, the driving of the motor is stopped, and the lifting or lowering of the blind is stopped. When the screw shaft rotates in a direction opposite to the rotation direction, the moving body moves in a direction opposite to the above direction, contacts the other limit switch and activates it. The wiring between the limit switches is such that each limit switch shares one of the three conductive plates,
Since the contact is performed by straddling the two conductive plates, even if the moving body moves between the limit switches as described above, the movable body does not get caught on the wiring of the limit switches. As a result, there is no possibility that the wiring is broken or a contact failure occurs. The rotation of the adjustment shaft is performed by an adjustment dial outside the limit switch case, and the position of each limit switch is adjusted by the rotation of the adjustment shaft. The limit switch case is installed such that the end on the adjustment dial mounting side is fitted to the end of the head box as a head box cap. This allows
There is no need to form a hole in the headbox to enable operation of the adjustment dial.

[0006]

FIG. 1 is an overall view of an electric blind to which the present invention is applied. The upper end of the pleated screen 12 (blind) is fixed to the head box 10, and the bottom rail 14 is attached to the lower end of the pleated screen 12. The pleated screen 12 is provided with pleats at predetermined vertical dimensions so as to be foldable, that is, expandable and contractible in the vertical direction. The elevating cord 18 passes through a through hole 16 provided at each pleat portion. One end of the lifting cord 18 is connected to the bottom rail 14. The other end of the lifting cord 18 is guided by a code guide 19 disposed in the head box 10 and is connected to a rotating drum 20 so as to be wound and unwound.
The pleated screen 12 expands and contracts in the vertical direction by winding and unwinding the lifting cord 18 around the rotating drum 20. The rotating drum 20 is provided with a rotating shaft 22 so as to rotate integrally therewith. The rotation shaft 22 can be driven to rotate by a motor 24 via a coupling 23.
A limit switch case 26 for controlling the driving of the motor 24 is provided at the right end of the head box 10 in FIG. A connector 28 extends from the left end of the head box 10 in FIG.

FIG. 2 is a perspective view of the limit switch case 26. Hollow rectangular parallelepiped limit switch case 26
On the inner surface of one of the longitudinal walls 30, three conductive plates 32, 34, and 36 are provided in parallel over the entire length of the longitudinal wall 30 in the longitudinal direction at predetermined intervals in the width direction. I have. A first limit switch 38 and a second limit switch 40 are in contact with each other across the conductive plates 32 and 34 and the conductive plates 34 and 36 (see FIG. 3). The first limit switch 38 and the second limit switch 40 are provided with operating pieces 35 and 37 in directions facing each other. The operating pieces 35 and 37 can operate the first limit switch 38 and the second limit switch 40, respectively, when they are pressed. The first limit switch 38 and the second limit switch 40 include connecting members 39 and 41 that project in the direction of the longitudinal wall 42 facing the longitudinal wall 30 of the limit switch case 26 and have internal threads at the ends, respectively. It is formed integrally. The adjusting shafts 48 and 50, each of which has a thread formed on the outer circumference, are connected to the longitudinal wall 4.
2 are rotatably supported on opposing width direction walls 44 and 46 of the limit switch case 26 at predetermined intervals vertically in FIG. The ends of the adjustment shafts 48 and 50 on the width direction wall 46 side are connected to adjustment dials 52 and 54 that can rotate them from outside the limit switch case 26 as shown in FIG. The female screw of the connecting member 39 of the first limit switch 38 is fitted to the adjusting shaft 48, and the female screw of the connecting member 41 of the second limit switch 40 is fitted to the adjusting shaft 50. By rotating 50,
First limit switch 38 and second limit switch 4
0 moves in the axial direction. A screw shaft 56 having a thread formed on its outer periphery is rotatably supported through the center position of the width direction wall portions 44 and 46. As shown in FIG. 5, the end of the screw shaft 56 on the width direction wall 44 side is rotatably connected to the rotation shaft 22 via the coupling 23. The screw shaft 56 is fitted to a moving body 58 having a female screw formed at the center, and the moving body 58 provided so as not to rotate as described later is rotated in the axial direction by rotating the screw shaft 56. Can be moved. The moving body 58
One end thereof is located between the first limit switch 38 and the second limit switch 40, and the other end extends from the inner surface of the longitudinal wall portion 42 to the entire length in the longitudinal direction as shown in FIG. The projection 60 is movably fitted to the projection 60. The limit switch case 26 is installed at the right end of the head box 10 in FIG. 1, and the width direction wall 46 of the limit switch case 26 serves as a right end cap of the head box 10.

Next, the operation of this embodiment will be described.
When raising the pleated screen 12, the motor 24
The rotary shaft 22 is driven to rotate, thereby rotating the rotary drum 20 in the winding direction of the lifting cord 18 integrally therewith. As a result, the lifting cord 18 is wound around the rotating drum 20, so that the pleated screen 12 rises. At the same time, the rotation of the rotation shaft 22 is also transmitted to the screw shaft 56 via the coupling 23. As the screw shaft 56 rotates, the moving body 58 moves rightward in FIG. 4 and contacts and presses the operating piece 35 of the first limit switch 38. As a result, the first limit switch 38 is operated, so that the drive of the motor 24 is stopped and the rise of the pleated screen 12 is stopped. Pleated screen 1
When the pleated screen 12 is lowered, the rotation shaft 22 is driven to rotate by the motor 24 in a direction opposite to the direction in which the pleated screen 12 is raised. As a result, the rotary drum 20 rotates in the direction in which the lifting cord 18 is unwound, so that the pleated screen 12 descends. At the same time, the rotation of the rotary shaft 22 causes the screw shaft 56 to rotate in a direction opposite to the direction in which the pleated screen 12 is raised. Thereby, the moving body 58 moves leftward in FIG. 4 and contacts and presses the operating piece 37 of the second limit switch 40. Thereby, the second limit switch 4
Since 0 operates, the driving of the motor 24 stops, and the lowering of the pleated screen 12 stops.

The stop positions when the pleated screen 12 is raised and lowered can be adjusted by adjusting dials 52 and 54. That is, the pleated screen 12
If you want to move the stop position when the
By rotating the adjustment dial 52, the adjustment shaft 48 is rotated to move the first limit switch 38 rightward in FIG. As a result, the distance between the moving body 58 and the first limit switch 38 increases, that is, the moving distance of the moving body 58 required for the moving body 58 to contact the first limit switch 38 increases. Axis 5
6 can be increased. Thus, the amount of the lifting cord 18 wound around the rotary drum 20 can be increased, and the stop position of the pleated screen 12 can be moved upward. Conversely, when it is desired to lower the stop position of the pleated screen 12, the adjustment shaft 52 is rotated in the opposite direction by rotating the adjustment dial 52 in the opposite direction, and the first limit switch 38 is turned on. It is moved to the left in FIG. This allows
Since the distance between the moving body 58 and the first limit switch 38 is reduced, that is, the moving distance of the moving body 58 required for the moving body 58 to contact the first limit switch 38 is reduced, the rotation of the screw shaft 56 is reduced. The number can be reduced. As a result, the lifting cord 18 is
Since the amount wound to zero can be reduced, the stop position of the pleated screen 12 can be moved downward. To change the stop position of the pleat screen 12 at the time of lowering further downward, the adjustment dial 5
By rotating the adjustment shaft 50 by rotating the
The limit switch 40 is moved leftward in FIG. This increases the distance between the moving body 58 and the second limit switch 40, that is, the moving body 58 necessary for the moving body 58 to contact the second limit switch 40.
Therefore, the number of rotations of the screw shaft 56 can be increased. Accordingly, the amount of the lifting cord 18 unwound from the rotary drum 20 can be increased, and the stop position of the pleated screen 12 can be moved downward. Conversely, when it is desired to change the stop position of the pleated screen 12 upward, the adjustment dial 54
Is rotated in the opposite direction to the above, so that the adjustment shaft 50 is rotated in the opposite direction to the above.
0 is moved rightward in FIG. Thereby, the moving body 5
8 and the second limit switch 40, that is, the moving body 58
Since the moving distance of the moving body 58 necessary for contacting the screw shaft 56 is reduced, the number of rotations of the screw shaft 56 can be reduced. Accordingly, the amount by which the lifting cord 18 is unwound from the rotary drum 20 can be reduced, so that the stop position of the pleated screen 12 can be moved upward.

[0010]

According to the present invention, the wiring between the limit switches is such that each limit switch shares one of the three conductive plates and makes contact across the two conductive plates. Therefore, even if the moving body moves between the limit switches as described above, the moving body does not get caught on the wiring of the limit switches. As a result, there is no possibility that the wiring is broken or a contact failure occurs. Further, since a cable for wiring between the limit switches is not required, a space for accommodating the cable in the limit switch case is not required. Thus, the size of the limit switch case can be reduced. An adjustment dial for adjusting the position of the limit switch is attached to the outside of one end of the limit switch case, and the end of the limit switch case is attached to the end of the head box as a head box cap. Installed in Thus, it is not necessary to form a hole in the head box for projecting the adjustment dial outside the head box. In addition, adjustment work of the arrangement position of the limit switch can be easily performed with a fingertip without using a tool such as a screwdriver.

[Brief description of the drawings]

FIG. 1 is an overall view of a blind in which a lifting and lowering rotation mechanism of the present invention is implemented.

FIG. 2 is a perspective view of a limit switch case.

FIG. 3 is a layout view of a limit switch.

FIG. 4 is a diagram showing a positional relationship between an adjustment shaft and a screw shaft.

FIG. 5 is a diagram in which a limit switch is attached to a head box.

FIG. 6 is a sectional view taken along line 6-6 in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Head box 12 Pleated screen (blind) 18 Elevating cord 20 Rotating drum 22 Rotating shaft 24 Motor 26 Limit switch case 30 Longitudinal wall part 32, 34, 36 Conductive plate 38 First limit switch 40 Second limit switch 48, 50 Adjustment axis 52, 54 Adjustment dial 56 Screw axis 58 Moving body

Claims (2)

(57) [Claims] 1. A rotary drum (20) having one end of an elevating cord (18) capable of elevating and lowering a blind (12) being connected to be rotatable and unwound. A motor (24) that can be driven to rotate, a stop position adjusting device that can control the driving of the motor (24), and the like. The longitudinal wall (3) of (26)
0), three conductive plates (32, 34, 36) are provided in parallel, and the first conductive plate (32) is located at the center of the conductive plate (34) and the other conductive plate (32) adjacent thereto. The limit switch (38) is in contact, and the second limit switch (40) is in contact with the conductive plate (34) located at the center and the other conductive plate (36) adjacent thereto. In the limit switches (38, 40), the female threads formed on them are formed on the outer periphery of two rotatable adjusting shafts (48, 50) extending in the longitudinal direction of the limit switch case (26). One end of each of the adjustment shafts (48, 50) is fitted to an adjustment dial (52, 5) provided outside the limit switch case (26).
4) It is connected so as to be able to rotate integrally with it. Between each limit switch (38, 40),
A moving body (58) that can come into contact with them is provided so as not to rotate, but to be movable in the axial direction. The moving body (58) has a female screw formed on the moving body (58) of the limit switch case (26). The screw shaft (58) is engaged with a male screw formed on the outer periphery of a rotatable screw shaft (58) extending the entire length in the longitudinal direction, and the screw shaft (58) is connected so as to rotate integrally with the rotation shaft (22). An electric blind stop position adjusting device, comprising: 2. The electric blind stop position adjusting device according to claim 1, wherein the limit switch case (26) is installed such that the adjustment dials (52, 54) protrude outside from the end of the head box (10).