JPH0214633Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to a winding device for a lifting tape for a blind.

Prior Art Conventionally, the slats of horizontal blinds are each supported by a plurality of ladder cords suspended from a head box and their angles can be adjusted, as described in, for example, Japanese Utility Model Application Publication No. 129152/1983. The slat is raised and lowered by winding or unwinding the lifting tape, which passes through the slat and suspends and supports the bottom rail at the lowest part, using a winding shaft in the head box.

However, with such blinds, there is a risk that both sides of the slats may come off the ladder cords due to left-right swings of the bottom rail, so the ladder cords are positioned inside the lifting tape on both sides of the blind, and the ladder cords are connected to the slats using the lifting tapes. It was necessary to prevent misalignment.
In that case, when the upper end of the ladder cord is suspended from the winding shaft via a hanging member, the ladder cord hanging member is fitted inside the winding shaft for the lifting tape on both sides of the head box. It was necessary to provide a separate take-up shaft for the hanging member for support.

Moreover, in this case, the task of assembling the blind becomes complicated and takes a long time, and the number of parts increases, resulting in an increase in production costs.

Purpose This invention was made to solve the above problem, and its purpose is to support the ladder cord on either side of the lifting tape and to shorten the time required to assemble the blind. Another object of the present invention is to provide a winding device for a blind lifting tape, which can reduce the production cost.

Structure of the device In order to achieve the above object, the structure of this device is as follows:
A fitting shaft that rotatably supports a winding shaft with respect to a case fixed in the head box, and that fits the pulley part for winding up and down the blind lifting tape onto the winding shaft and the ladder cord hanging member. In a winding device for a blind lifting tape,
The fitting shafts are provided on both sides of the pulley shaft so as to sandwich the pulley portion, and both the fitting shafts are formed to have the same diameter, and a ladder cord is provided on the bottom of the case corresponding to both the fitting shafts. They each have an opening for passing through.

Embodiment An embodiment embodying this invention will be described below with reference to the drawings.A blind 1 has a ladder cord 3 hanging from both ends of a head box 2.
A plurality of slats 4 are supported on the ladder cord 3, and the upper end of a lifting tape 5 passing through each slat 4 on the outside of the ladder cord 3 is supported by a winding device 8 (described later) inside the head box 2, and a bottom rail 6 is attached at the lower end. Suspended. The blind 1 is raised and lowered by operating the operating string 7 hanging from one end of the head box 2 to wind up or unwind the lifting tape, thereby moving the bottom rail 6 up and down.

The winding device 8 that supports the lifting tape in the head box 2 will be explained with reference to FIG. The winding shaft 10 supporting the winding shaft 3 is rotatably supported. A drive shaft 11 in the shape of a rectangular bar extending in the longitudinal direction of the head box 2 is fitted into the axial center of the winding shaft 10, and
When the drive shaft 11 is rotated by this operation, the winding shaft 10 supported by the case 9 at both ends of the head box 2 is rotated in synchronism.

A pulley part 12 for winding up the lifting tape 5 is integrally formed in the center of the winding shaft 10, and the lifting tape 5 is wound around the pulley part 12.
Fitting shafts 14 for fitting the hanging members 13 of the ladder cord 3 are symmetrically formed on both sides of the pulley part 12, and the hanging members 14 are connected to one side of the pulley part 12 toward the inside of the blind 1. 13 are fitted. The hanging member 13 is molded from synthetic resin, has a partially open annular shape as shown in FIG. is ladder code 3
As shown in FIG. 8, a knot formed at the upper end of the ladder cord 3 is respectively latched. An engagement groove 16 is formed in the center from both sides of the hooking part 15 to the open end, and a protrusion 17 is formed inside the open end. Therefore, when this hanging member 13 is fitted to the fitting shaft 14, the eighth
As shown in the figure, the protrusion 17 comes into contact with the outer circumferential surface of the fitting shaft 14 and expands outward, so it rotates along with the fitting shaft 14 due to the friction caused by the repulsive force, and at that time The ladder cord 3 is the engagement groove 16
engage with.

Openings 31 for passing the ladder cord 3 therethrough are provided in the bottom surface of the case 9 corresponding to the two fitting shafts 14, respectively.

The winding shaft 10 is located at one end of the head box 2.
A gear 18 is fitted to one end to prevent the rotation of the winding shaft 10 when the blind 1 reaches the lowest position or comes into contact with some obstacle and cannot be lowered. . The fitting hole 19 of the gear 18 has an enlarged diameter on one side, and an annular spring 20 is installed therein. One end 20a of the annular spring 20 is fixed to the circumferential surface of the fitting hole 19, and the other end 20b
When the gear 18 is fitted onto the winding shaft 10, it is fitted and fixed into a locking hole 21 on one side of the winding shaft 10 shown in FIG. Also, approximately from the protruding position of the other end 20b of the annular spring with respect to the center of the fitting hole 19,
A rotation regulating piece 22 is projected at a position shifted by 180 degrees.

Therefore, when the winding shaft 10 and the gear 18 rotatably fitted to the winding shaft 10 are relatively rotated by 180 degrees against the biasing force of the annular spring 20,
As shown in FIG. 6, the other end 20b of the annular spring comes into contact with the rotation restriction piece 22, making further relative rotation impossible.

A stopper 23 is provided below the gear 18 to restrict rotation of the gear 18. The stopper 23 is a guide protrusion 24 provided on the bottom surface of the case 9.
The blind 1 is movable in the front-rear direction along the winding shaft 10, that is, in the direction orthogonal to the winding shaft 10, and is formed so as to gradually become higher toward the rear as shown in FIG. It is always biased forward by a coil spring 25 disposed between. Note that the limit of movement to the stopper 23 is determined by the guide groove 26 provided on the side surface of the case 9 and the protrusion 2 protruding from the stopper 23 into the guide groove 26.
7. A projecting piece 28 that projects laterally from the stopper 23 to a position below the pulley portion 12 is provided with a vertical through hole 29 at its tip, and the lifting tape 5 hanging from the pulley portion 12 is inserted into the through hole 29. has been done. and,
The lifting tape 5 is guided by a roller 30 supported by the case 9 below the protruding piece 28 and is suspended below the head box 2.

When the weight of the bottom rail 6 and the slats 4 is acting on such a lifting tape 5, the fourth
As shown in the figure, the protruding piece 28 is moved rearward because it is tensioned linearly between the roller 3 and the pulley part 12 within the head box 2. Therefore, at this time, the stopper 23 is connected to the coil spring 2.
5, and its upper end does not engage with the gear 18, as shown in FIG.

Next, the operation of the lifting tape winding device configured as described above will be explained.

Now, when the blind 1 is not lowered to the lowest position or is not in contact with an obstacle, the weight of the bottom rail 6 and the slat 4 acts on the lifting tape 5, so as shown in FIGS.
As shown in the figure, the stopper 23 has been moved rearward and is in a position where it does not engage with the gear 18, so if the winding shaft 10 is rotated via the drive shaft 11 by operating the operating string 7, the slat 4 can be rotated. It can be raised and lowered as desired. At this time, when the winding shaft 10 is started, the hanging member 13 is attached to the winding shaft 10 as shown in FIG.
0, and after each slat 4 is tilted to an almost vertical state, the hanging member 13 and the fitting shaft 14
An idle rotation occurs between the slats 4, and each slat 4 is raised and lowered in a vertical state.

Furthermore, when the blind 1 is lowered to the lowest position, or when it comes into contact with some obstacle and cannot be lowered, the entire weight of each slat 4 and bottom rail 6 acts on the ladder cord 3 or the obstacle. Therefore, in that state, the winding shaft 10
When is further rotated in the same direction, the lifting tape 5 loosens within the case 9 as shown in FIG. Then, the stopper 23 is moved forward by the biasing force of the coil spring 25, as shown by the chain line in the figure, and the gear 18 engages with the stopper 23, as shown in FIG. 6, to prevent further rotation. .

Even if the gear 18 is prevented from rotating, the gear 18 and the take-up shaft 10 can rotate relative to each other within 180 degrees.
That is, in FIG. 6, at the moment when the rotation of the gear 18 is stopped by the stopper 23, the other end 20b of the annular spring, which is in the position shown by the solid line, moves toward the winding shaft 1.
When the take-up shaft 10 is rotated 180 degrees to the position shown by the chain line due to zero rotation, the rotation of the winding shaft 10 is stopped.

Therefore, when the blind 1 cannot be lowered, the stopper 23 is activated and the rotation of the winding shaft 10 is prevented via the gear 18, so that the lifting tape 5
will not be rewound unnecessarily. Furthermore, even if the lifting tape 5 momentarily loosens inside the case 9 due to a sudden downward operation, the weight of the bottom rail 6 and the slat 4 will be transferred to the lifting tape 5 during the 180 degree relative rotation between the gear 18 and the winding shaft 10. If this function is activated, the blind 1 can be smoothly lowered without blocking the rotation of the winding shaft 10. In addition, gear 18
Since the amount of unwinding of the lifting tape 5 due to the relative rotation between the winding shaft 10 and the winding shaft 10 is very small, there is no problem.

Further, the winding device 8 for the lifting tape of this blind 1 is provided on both sides of the pulley portion 12.
A fitting shaft 14 is provided for fitting the ladder cord hanging member 13 in such a manner as to sandwich the two fitting shafts 14, and both fitting shafts 14 are formed to have the same diameter, and the bottom surface of the case 9 corresponding to both fitting shafts 14 is provided. Since the openings 31 for passing the ladder cord 3 are provided in each of the parts, the hanging member 13 can be fitted to either side of the pulley part 12. Therefore, in this blind 1, the winding shaft 10 supporting the lifting tape 5 and the hanging member 13 of the ladder cord 3 on the left and right sides of the head box 2 can be used as a common member without changing the mounting direction. Since the hanging member 13 is supported by the fitting shaft 14 inside the pulley part 12 with respect to the blind 1, as shown in FIG.
is located inside the lifting tape 5. In this state, the relative outward movement of the ladder cord 3 with respect to the slat 4 is regulated by the lifting tape 5, so even if the bottom rail 6 swings from side to side, the slat 4 will not slip out from the ladder cord 3.

Furthermore, in the assembly work of this blind 1, there is no need to attach both the winding shaft for the lifting tape and the winding shaft for the hanging member, unlike in the past. The work time can be shortened since it is only necessary to install the winding shaft without changing the mounting direction.Moreover, since the winding shaft 10 can be used as a common member on both the left and right sides of the head box 2, the number of parts can be reduced and production costs can be reduced. It can be lowered.

Effects As detailed above, this invention provides fitting shafts for fitting the ladder cord hanging member on both sides of the pulley part so as to sandwich the same pulley part, so that both fitting shafts have the same diameter. At the same time, openings for passing the ladder cord through are provided in the bottom of the case corresponding to both fitting shafts, so that the ladder cord can be supported on either side of the lifting tape. In addition, during blind assembly work, you only need to install one take-up shaft in the same mounting direction for both the left and right sides of the head box, reducing work time. Since it can be used as a common member, the number of parts can be reduced and production costs can be lowered.

[Brief explanation of the drawing]

Figure 1 is a front view of the blind related to this invention, Figure 2 is a front view showing the lifting tape winding device of this invention, Figure 3 is an exploded perspective view of the winding shaft, and Figure 4 is the winding shaft and 5 and 6 are vertical sectional views showing the relative relationship between the stopper of the lifting tape, FIG. 7 is a side view of the winding shaft, and FIGS. 8 and 9. The figure is a longitudinal sectional view showing the relative relationship between the winding shaft and the ladder cord hanging member. Blind 1, head box 2, ladder cord 3, lifting tape 5, winding device 8, case 9, winding shaft 10, pulley portion 12, hanging member 13, fitting shaft 14, opening 31.

Claims (1)

[Claims for Utility Model Registration] A winding shaft 10 is rotatably supported with respect to a case 9 fixed in a head box 2.
A blind lifting tape winding device 8 is provided with a pulley portion 12 for winding up the lifting tape 5 of the blind 1 and a fitting shaft 14 for fitting the ladder cord hanging member 13. 14 are provided on both sides of the pulley part 12 so as to sandwich the pulley part 12, and both fitting shafts 1
4 are formed to have the same diameter, and openings 31 for passing the ladder cord 3 through are provided in the bottom of the case 9 corresponding to both the fitting shafts 14. Tape winding device.