JP3066219U - Curtain opening and closing device - Google Patents

Abstract

(57) [Problem] To provide a curtain body opening / closing device that can securely and firmly fix a lifting cord to a curtain body and that can easily and easily perform a work of adjusting a hanging dimension thereof. A lifting / lowering cord (5) of a curtain opening / closing device (1) is attached to a string fixing tool (1).
2 and is inserted substantially perpendicularly into the groove 17 and the concave portion 18 of the winding portion 14 and wound around the winding shaft 15. The elevating cord 5 is inserted again into the groove 17 of the winding part 14, overlaps with the elevating cord 5 previously wound, and overlaps the projection 22 protruding from the winding shaft 15. The end of the lifting cord 5 is connected to the cord receiving part 19 of the cord fixing part 19 corresponding to its thickness.
a and 19b are inserted and fixed substantially horizontally. The locking portion 20 of the string fixing device 12 is fixed to the ring 7 attached to the lower edge of the curtain 6 and attached.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a curtain opening / closing device that opens and closes a curtain such as a curtain or a screen with a lifting cord.

[0002]

[Prior art]

 Conventionally, when the above-mentioned lifting cord is fixed to the curtain body, there is a method of fixing with a cord fixing tool as described later. For example, a string fixing device 30 according to a first conventional example shown in FIG. 10 is configured such that a lifting / lowering cord 35 is inserted through a conical holding case 31 and circulates around a hanging portion 33 of a hanging portion 32. The lifting member 32 is inserted into the holding case 31, and the lifting / lowering cord 35 is sandwiched and fixed between the holding case 31 and the string hook 33.

[0003] Further, a string fixing device 36 of a second conventional example shown in FIG. 11 inserts a lifting / lowering cord 35 into a vertically long holding case 37 and circulates around a pin 39 attached to a guide hole 38 of the holding case 37. After that, the pin 39 is pushed between the tapered portions 40, 40 formed in the holding case 37, and the lifting cord 35 is clamped and fixed between the pin 39 and the tapered portion 40.

[0006] Furthermore, in a third conventional example of a string fixing tool 43 shown in FIG. 12, a lifting portion 35 is formed by inserting an elevating cord 35 through an upper end of a tool body 44 and forming a lower end of the tool body 44. This structure is wound around 45 and fixed. The hook 34 of the hanging member 32, the hook 41 of the holding case 39, and the hook 46 of the component body 44 are engaged with the ring 7 attached to the lower edge of the curtain 6.

[0005]

[Problems to be solved by the invention]

 The above-mentioned string fixing devices 30 and 36 have a structure in which the elevating string 35 is clamped and fixed. Therefore, if the elevating string 35 is thick, the contact resistance at the time of insertion and removal is large, and it takes time and effort to adjust the hanging dimension. Takes time.

On the other hand, if the elevating cord 35 is thin, the contact resistance at the time of clamping is small, and the hanging part 33 and the pin 39 are easy to fall off. There is a problem that it is limited to only the elevating cord 35 having a height.

Further, when the drooping load applied to the lifting / lowering cord 35 fluctuates, the strap hooking part 33 of the strap fixture 30 and the pin 39 of the strap fixture 36 move up and down, and the winding of the strap fixture 43 The lifting cord 35 wound around the part 45 may be loosened, and it is difficult to maintain the fixed state of the lifting cord 35.

In addition, since the hanging length of the lifting cord 35 fluctuates by the pushing amount of the hanging portion 33 and the pin 39, the lifting cord 35 must be fixed to a hanging dimension in consideration of the pushing amount, and a predetermined length is required. There is a problem that it is difficult to adjust the hanging dimension.

[0009] In view of the above problem, the present invention is to wind a hoisting cord in a state of crossing the winding part of the cord fixing device, and to bite one or a plurality of protrusions protruding from the winding part into the hoisting string. Accordingly, an object of the present invention is to provide a curtain body opening / closing device that can securely and firmly fix a lifting / lowering cord to a curtain body, and that can easily and easily adjust a hanging dimension thereof.

[0010]

[Means for Solving the Problems]

 The invention according to claim 1, wherein the end of the elevating cord for elevating and lowering the curtain is wound around a winding part of a cord fixing device attached to the lower end side edge of the curtain, and is pulled up and closed. An opening / closing device, wherein a groove portion into which the elevating cord is inserted substantially vertically is formed in a winding portion of the string fixing device, and the groove is wound around the winding surface on the winding surface of the winding portion. It is a curtain opening / closing device in which a projection is formed to project radially in opposition to the elevating cord.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the protrusion formed on the winding portion is provided in a predetermined manner in a circumferential direction along a winding surface of the winding portion. It is characterized in that it is a curtain opening / closing device formed plurally at intervals.

According to a third aspect of the present invention, there is provided a curtain opening / closing device in which the plurality of projections are arranged in a staggered direction with respect to the winding surface of the winding portion, in addition to the configuration of the second aspect. It is characterized by the following.

According to a fourth aspect of the present invention, in addition to the configuration of the first, second, or third aspect, a string fixing portion for inserting and fixing an end of the elevating string substantially horizontally below the winding portion. And a curtain body opening / closing device in which a plurality of concave string receiving portions are formed in the string fixing portion substantially corresponding to the thickness of the lifting / lowering string.

According to a fifth aspect of the present invention, in addition to the configuration of the fourth aspect, the string fixing portion includes a string receiving portion for fixing the thick lifting and lowering string, and a string receiving portion for fixing a thin lifting and lowering string. It is characterized in that it is a curtain opening / closing device formed independently.

[0015]

[Action]

 The curtain opening / closing device according to claim 1, before or after fixing the string fixing device to the lower end side edge of the curtain, sets the end of the lifting / lowering cord substantially perpendicular to the groove of the winding portion. Insert and wind on the winding surface of the winding part. The lifting cord is inserted into the groove again, and overlaps with the lifting cord wound around the winding part so as to intersect, and the protrusion protruding from the winding part is cut into the lifting cord and fixed.

In the curtain opening / closing device according to the second aspect, in addition to the operation according to the first aspect, by making the plurality of protrusions bite into the lifting / lowering string, the resistance applied to the lifting / lowering string increases, and This prevents the lifting cord from being displaced in the direction in which the rotation is released.

According to a third aspect of the present invention, in addition to the operation of the second aspect, the curtain opening / closing device has a plurality of protrusions which are alternately bitten into the lifting / lowering string, thereby providing resistance to the lifting / lowering string. The biting force increases, and the lifting cord is prevented from being displaced in the direction in which the winding is released.

According to a fourth aspect of the present invention, in addition to the operation of the first, second, or third aspect, each of the string fixing portions in which the elevating string is formed in a size corresponding to the thickness of the string. By inserting and fixing the cord approximately horizontally to the string receiving portion, the lifting cord is pulled by the hanging load in the insertion direction, and the lifting cords having different thicknesses are securely fixed.

According to a fifth aspect of the present invention, in conjunction with the operation of the fourth aspect, the curtain body opening and closing device is capable of independently moving a plurality of lifting and lowering strings having different thicknesses into a size substantially corresponding to the thickness of each string. The elevating cords are individually fixed by inserting and fixing them into the formed cord receiving portions.

[0020]

[Effect of the invention]

 According to this invention, the lifting cord is superimposed in a crossing state and wound around the winding part of the cord fixing device, and one or more projections are cut into the lifting cord, so that the end of the lifting cord is Can be securely and firmly fixed to the curtain. In addition, the more the drooping load is applied to the lifting cord, the larger the amount of bite of the protrusion becomes, so that it is difficult to loosen, and the displacement of the lifting cord in the direction in which the winding is released can be positively prevented. , Can be maintained at a predetermined hanging dimension.

Moreover, since the elevating cord is wound so as to intersect, the cord is not limited to a cord having a specific thickness, type, material, and combination, and any cord can be used. In addition, the hanging dimension of the elevating cord hardly changes during winding, and the hanging string can be wound and fixed in a state of hanging to a predetermined length, and the operation of adjusting the hanging dimension can be performed easily and easily.

[0022] Furthermore, by staggering the plurality of projections, the resistance and the biting force applied to the lifting cord are increased, and the lifting cord is prevented from being displaced in the direction in which the winding is released. it can.

Furthermore, since the elevating cord is inserted and fixed substantially horizontally to each cord receiving part of the cord fixing part corresponding to the thickness of the cord, it is pulled by the drooping load in the insertion direction, and Different lifting cords can be securely fixed. In addition, since the elevating cord is fixed by winding and inserted and fixed by double locking, it can be fixed more firmly than a conventional cord fixing device.

Furthermore, since the thick lifting and lowering cord and the thin lifting and lowering string are inserted into and fixed to the string receiving portions independently formed in a size corresponding to the thickness of each of the strings, it is necessary to fix each of the strings. A stable fixing force can be obtained.

[0025]

【Example】

 One embodiment of the present invention will be described in detail below with reference to the drawings. The drawings show, as an example of a curtain, a curtain opening / closing device for lifting and opening a curtain with a lifting / lowering cord. In FIGS. 1 and 8, the curtain opening / closing device 1 is used, for example, for windows and walls of buildings and vehicles. The rotating shaft 3 inside the rail 2 laid on a fixed portion (not shown) such as a portion, a ceiling portion, etc., is rotated forward and reverse to wind up or down the winding cord 5 on a winding drum 4 fixed on the rotating shaft 3. At the same time, the curtain 6 is pulled up and closed in accordance with the operation. Further, the winding drum 4 on the rotating shaft 3 suspended on the lower surface of the rail 2 may be fixed.

A plurality of the above-mentioned winding drums 4 are fixed at predetermined intervals with respect to the entire length of the rotating shaft 3, and an upper end portion of a lifting / lowering cord 5 formed with a predetermined hanging dimension is fixed to a winding surface thereof. doing.

The lower end of the lifting / lowering cord 5 is inserted into a ring 7 attached to the back surface of the curtain 6 at a predetermined interval in the vertical direction, and is fixed to the lower end side edge of the curtain 6. It is wound and fixed on the fixture 12. Further, the lifting cord 5 may be inserted through an annular insertion (not shown) knitted on the curtain 6 itself.

On the other hand, the upper end side edge of the curtain 6 is fixed to the entire front side of the rail 2 by a fixing member (not shown) such as a hook-and-loop fastener, a magnet, an adhesive tape, a hook or an adhesive or an adhesive. doing.

The operation cord 8 hanging at the end (right end) of the rail 2 is held in an operation unit 9 fixed to the end of the same side, and circulates around a pulley 10 fixed to the end of the rotating shaft 3. I have.

By pulling down one end of the operation cord 8 with a user's hand, the pulley 10 is rotationally fixed or unlocked by a lock mechanism (not shown) built in the operation unit 9. At the time of releasing the fixing, one end side of the operation cord 8 is pulled down, and the rotating shaft 3 is rotated forward and reverse in a direction for winding or rewinding the lifting cord 5 on the winding drum 4.

Note that, without using the winding drum 4, the plurality of lifting / lowering strings 5 are bundled together and connected to the operation string 8, and the operation of the operation string 8 is lowered to collectively move the lifting / lowering strings 5. The curtain 6 may be pulled up and down by opening and closing by performing a lifting operation.

Further, a motor with a speed reducer (not shown) may be directly connected to the end of the rotating shaft 3 and opened and closed by a wireless or wired control switch (not shown). The opening and closing operation of the curtain 6 may be detected by, for example, a detection sensor, a limit switch, or the like, and the opening and closing of the curtain 6 may be stopped at a preset position.

As shown in FIG. 2, FIG. 3, and FIG. 4, the cord fixing device 12 is integrally formed of a hard synthetic resin such as polyacetal, polycarbonate, or polyvinyl chloride. Is attached between the lower end of the lifting cord 5 and the lower edge of the curtain 6. In addition, as a member in place of the elevating cord 5, for example, a striated body made of resin, metal, or fiber such as a cord, a wire, a rope, a belt, or the like may be used.

A winding portion 14 for winding and fixing the elevating cord 5 is formed forward on the front surface of the upper end side of the tool body 13 constituting the string fixing device 12, and at the lower end side of the tool body 13, The locking portion 20 for locking the ring 7 is formed rearward (or forward). Note that the string fixing tool 12 may be formed of a material such as metal, wood, or the like.

The above-mentioned winding portion 14 is formed in a substantially T-shape when viewed from the side, and a winding shaft 15 around which the lifting cord 5 is wound is attached to the center of the upper end side front surface of the component body 13. At the front end of the winding shaft 15, a retaining portion 16 which is substantially circular (or elliptical) when viewed from the front and is larger than the outer diameter of the winding shaft 15 is formed.

The vertically elongated groove 17 formed in the center of the front side of the winding portion 14 has a groove depth that equally divides the winding shaft 15 and the retaining portion 16 into right and left directions. The groove width is formed so that it can be inserted into the groove.

In addition, between the shaft parts 15 a, 15 a constituting the winding shaft 15 and the stopper parts 16 a, 16 a constituting the retaining part 16, The vertically long concave portion 18 formed in the center surface on the end side has a length and a width substantially equal to those of the groove portion 17 and is formed at a depth at which the lifting cord 5 is held in a state of being inserted in the vertical direction. , From the upper end to the lower end.

The pair of projections 22 formed on the lower peripheral surfaces of the shaft portions 15a, 15a have a substantially triangular shape (or a curved surface shape) when viewed from the side, and are formed in the axial direction or the circumferential direction. They are formed in alternate directions.

When viewed from the front, the projection 22 formed on the left shaft portion 15a is formed in a tapered shape for guiding the lifting cord 5 toward the front side, and the projection 22 formed on the right shaft portion 15a is formed with the lifting cord 5 It is formed in a tapered shape that guides toward the rear side. Further, a plurality of pairs of projections 22 may be formed at predetermined intervals on the upper peripheral surface, the side peripheral surface, and the entire peripheral surface of the winding shaft 15.

On the other hand, a substantially claw-shaped string fixing portion 19 formed on the base front surface of the locking portion 20 (substantially the center of the front surface of the component body 13) is capable of inserting the lifting cord 5 from below. It is formed in a downward shape that is clamped and fixed in a direction substantially orthogonal (or crossing) to the tool body 13 and is eccentric to the front with respect to the winding portion 14 when viewed from the side. Note that the string fixing portion 19 may be formed at a height that is substantially the same as the winding portion 14.

The string fixing portion 19 is brought close (or abutted) to an interval that is narrower than the thickness of the lifting / lowering cord 5 with respect to the front surface on the base end side of the locking portion 20, and the distal end is fixed to the string. The elevating cord 5 is formed to have an angle and a shape to be inserted and guided between the portion 19 and the locking portion 20.

As shown in FIG. 7 and FIG. 8, concave holding portions 19 a and 19 b are formed on the holding surface of the string fixing portion 19 so as to face the base front side of the locking portion 20. A thick lifting cord 5 is clamped and fixed to the lower cord receiving portion 19a (shown by a solid line in the drawing), and a thin lifting cord 5 is clamped and fixed to the upper cord receiving portion 19b (shown by a virtual line in the drawing). Is done.

The convex string restricting portion 19c formed between the string receiving portions 19a and 19b allows a thin string to pass and blocks a thick string. Note that a string formed of knitting or a material may be fixed to the string receiving portions 19a and 19b so that the thickness is displaced.

The above-mentioned locking portion 20 is formed in a substantially U-shape when viewed from the side, and the lower end side of the component body 13 is turned back to allow the locking and removal of the ring 7. It is formed to be flexible at an angle. The locking portion 20 may be formed in, for example, a C shape, a J shape, an L shape, or the like.

The retaining protrusion 21 formed on the rear surface on the base end side of the locking portion 20 is formed in a substantially trapezoidal shape when viewed from the side, and a step formed on the free end side of the locking portion 20. It protrudes (diagonally downwards) in the direction opposite to the portion 20a, and approaches (or abuts) the step 20a at the interval where the ring 7 is prevented from coming off.

In addition, the upper side end of the retaining projection 21 is inclined at an angle at which the ring 7 is locked and guided with respect to the locking portion 20, and the ring 7 is pulled out and guided at the lower side end. It is inclined to an angle. The locking portion 20 is flexible so that the locking of the ring 7 is permitted, and has elasticity that allows the ring 7 to be restored to a state in which the ring 7 is prevented from being pulled out.

The illustrated embodiment is configured as described above, and a method of fixing the elevating cord 5 and the curtain 6 constituting the curtain opening / closing device 1 with the cord fixture 12 will be described below.

First, as shown in FIG. 1, in a state where the curtain 6 is pulled down to the closed state, the lifting / lowering cord 5 pulled out from the winding drum 4 is inserted through a ring 7 attached to the curtain 6, and 6 hangs down an arbitrary length below the ring 7 attached to the lower edge of the lower end.

Next, as shown in FIGS. 5 and 6, the elevating cord 5 is inserted into the groove 17 of the winding part 14 formed on the cord fixing device 12, engaged with the concave part 18, and hangs vertically. .

The elevating cord 5 is circulated clockwise or counterclockwise as viewed from the front (indicated by a virtual line in FIG. 5), so that the elevating cord 5 is formed into a figure shape or an eight shape with respect to the winding shaft 15. It is wound (for example, once and a half turn or plural times or more), and is superimposed on the string engaged with the concave portion 18.

Next, as shown in FIGS. 7 and 8, the elevating cord 5 is inserted into the groove 17 of the winding part 14, superimposed on the cord wound on the winding shaft 15, and On the other hand, the pair of projections 22 protruding from the winding shaft 15 are made to bite. The number of windings may be changed according to the thickness of the elevating string 5, for example, a thick string is wound once, and a thin string is wound two or more times.

Next, the end of the lifting cord 5 is hung down below the winding part 14, and is inserted and fixed substantially horizontally to the cord receiving parts 19 a and 19 b of the cord fixing part 19. For example, a thick string is inserted and fixed in the string receiving portion 19a, and a thin string is inserted and fixed in the string receiving portion 19b.

Next, the locking portion 20 of the string fixing device 12 is locked to the ring 7 attached to the lower edge of the curtain 6, and the ring 7 is prevented from being removed by the retaining protrusion 21. Further, the string fixing device 12 may be directly locked to the lower edge of the curtain 6.

In the same manner as described above, the remaining lifting cords 5 hanging down on the back side of the curtain 6 are locked to the rings 7 attached to the lower end side edge of the curtain 6 via the cord fixing device 12. I do.

In a state where the curtain 6 is pulled up to the open state, the string fixing device 12 fixed to the lower end of the elevating string 5 may be locked to the ring 7 attached to the lower edge of the curtain 6. Alternatively, the lower end of the lifting / lowering cord 5 may be wound and fixed to the string fixing device 12 locked to the lower end side edge of the curtain 6.

As described above, the elevating cord 5 is superimposed in a crossing state and wound around the winding part 14 of the cord fixing device 12, and the pair of projections 22 protruding from the winding shaft 15 with respect to the elevating cord 5. As a result, the resistance applied to the lifting cord 5 is increased, and the end of the lifting cord 5 can be securely and firmly fixed to the lower edge of the curtain 6. In addition, the more the hanging load is applied to the lifting cord 5, the larger the amount of bite of the protrusion 22 becomes, so that it is difficult to loosen, and the displacement of the lifting cord in the direction in which the winding is released is positively prevented. And can be maintained at a predetermined hanging dimension.

Moreover, since the elevating cord 5 is wound so as to intersect, the cord is not limited to a cord having a specific thickness, type, material, and assembling method, and any cord can be used. In addition, the hanging dimension of the elevating cord 5 hardly changes when it is wound, and it can be wound and fixed in a state of hanging to a predetermined length, so that the operation of adjusting the hanging dimension can be performed easily and easily.

Further, since the elevating cords 5 having different thicknesses are inserted and fixed substantially horizontally in the cord receiving portions 19a and 19b of the cord fixing part 19, they are pulled in the insertion direction by the drooping load, and the thick cords and the thin cords are drawn. The string can be securely fixed. In addition, since the lifting cord 5 is wound and inserted and fixed, and is double-locked and fixed, it can be fixed more firmly than the string fixing tools 30, 36, 43 as in the conventional example.

Furthermore, since the lifting cord 5 is vertically engaged with the concave portion 18 of the winding part 14 and is fixed substantially perpendicularly to the cord fixing tool 12, the lifting cord 5 is opened and closed when the curtain 6 is opened and closed. Alternatively, it is possible to prevent the cord fixing device 12 from being eccentric or inclined, and the curtain 6 can be pulled up and down while maintaining an arbitrary suspended state.

Further, since the locking portion 20 of the string fixing device 12 is locked to the ring 7 attached to the lower edge portion of the curtain 6, the string fixing device 12 is fixed to the lower edge portion of the curtain 6. The labor and work of fastening and fixing are omitted, and the work of fixing and removing the string fixing device 12 to the lower edge portion of the curtain 6 can be performed easily and easily.

FIG. 9 shows another embodiment of the cord fixing device 12, in which a plurality of pairs of projections 22 are formed at predetermined intervals in the circumferential direction along the circumference of the winding shaft 15. Since the plurality of protrusions 22 are staggered into the hoisting string 5 wound around the winding shaft 15, the resistance applied to the hoisting string 5 increases, and loosening hardly occurs.

When the drooping load applied to the lifting cord 5 increases, the winding force is applied in the direction in which the projections 22 bite, so that the lifting cord 5 is displaced in the direction in which the winding is released. Can be positively prevented.

Next, the thick lifting / lowering string 5 is inserted into and fixed to the string receiving portion 19 a of the string fixing portion 19 independently formed on the lower side, and the thin lifting / lowering string 5 is independently formed on the upper side. Since the fixing portion 19 is inserted and fixed to the string receiving portion 19b, the fixing force required for fixing each string can be stably obtained, and it is possible to obtain substantially the same or more effect than the above-described embodiment. it can. Note that the string receiving portion 19a may be formed on the upper side, and the string receiving portion 19b may be formed on the lower side.

In correspondence between the configuration of the present invention and the above-described embodiment, the curtain body of the present invention corresponds to the curtain 6 of the embodiment, but the present invention is limited to only the configuration of the above-described embodiment. Not something.

The winding drum 4 is rotated forward and reverse in a state where the string fixing device 12 fixed to the lower end portion of the lifting / lowering cord 5 is locked to the ring 7 attached to the lower edge of the curtain 6. The hanging dimension of the lifting cord 5 may be variably adjusted.

The curtain 6 may be suspended in a suspended state of, for example, a balloon type, a plain type, or the like by adjusting the hanging dimension of the lifting cord 5 variably.

[Brief description of the drawings]

FIG. 1 is a rear view of a curtain showing a mounting state of a string fixing device.

FIG. 2 is a perspective view showing an external shape of a cord fixing device.

FIG. 3 is a front view showing the string fixture before winding the string.

FIG. 4 is a side view showing the string fixing device before winding the string.

FIG. 5 is a front view showing a winding state of a lifting cord.

FIG. 6 is a sectional view taken along line AA of FIG. 6 showing a winding state of the lifting cord.

FIG. 7 is a front view showing a state where the end of the lifting cord is fixed.

FIG. 8 is a side view showing an attached state of the string fixing device.

FIG. 9 is a side view showing another embodiment of the cord fixing device.

FIG. 10 is a side view showing a string fixing state of the string fixing device of the first conventional example.

FIG. 11 is a front view showing a string fixing state of the string fixing device of the second conventional example.

FIG. 12 is a side view showing a string fixing state by a third conventional example of a string fixing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Curtain opening / closing apparatus 5 ... Elevating cord 6 ... Curtain 7 ... Ring 12 ... String fixing device 13 ... Tool body 14 ... Winding part 15 ... Winding shaft 16 ... Detachment part 17 ... Groove part 19 ... String fixing part 19a, 19b ... string receiving part 20 ... locking part 21 ... retaining projection 22 ... projection

Claims (5)

[Utility model registration claims] 1. A curtain opening / closing device which winds and lifts an end of a lifting / lowering cord for raising / lowering a curtain to a winding portion of a cord fixing device attached to a lower end side edge of the curtain. In the winding portion of the cord fixing device, a groove portion into which the lifting cord is inserted substantially vertically is formed, and on a winding surface of the winding portion, a lifting cord wound around the winding portion is provided. A curtain opening / closing device in which projections are formed so as to protrude radially in opposition. 2. The curtain opening / closing device according to claim 1, wherein a plurality of projections formed on the winding portion are formed at predetermined intervals in a circumferential direction along a winding surface of the winding portion. 3. The curtain opening / closing device according to claim 2, wherein the plurality of protrusions are arranged in a staggered direction with respect to a winding surface of the winding portion. 4. A string fixing portion for inserting and fixing an end of the lifting cord substantially horizontally is formed below the winding part, and the string fixing part substantially corresponds to the thickness of the lifting cord. The curtain body opening / closing device according to claim 1, 2 or 3, wherein a plurality of concave string receiving portions are formed. 5. The curtain body opening and closing device according to claim 4, wherein the string fixing portion is formed independently of a string receiving portion for fixing the thick lifting and lowering cord and a string receiving portion for fixing the thin lifting and lowering string.