JP2013023836A - Lifting stop device of blind - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the degree of freedom of positions of a lifting cord and a lifting stop device in the lifting stop device of a blind for detecting loosening of the lifting cord and automatically stopping a lifting operation of the blind.SOLUTION: The lifting stop device comprises: a slider 38 arranged so as to reciprocate to a head box; and a micro-switch 36 capable of regulating rotation of a lifting drum 22 when the slider 38 is at a neutral position of a reciprocating range and releasing the regulation of the rotation of the lifting drum when the slider 38 is somewhere other than the neutral position of the reciprocating range. The slider 38 is capable of approaching the neutral position from any side of the reciprocating range, is on one side of the reciprocating rage to the neutral position when the lifting cord is in a tense state, and is moved to the neutral position when the lifting cord is loosened.

Description

  The present invention relates to a blind lift stop device that detects looseness of a lift cord and automatically stops the lifting operation of the blind.

  As a conventional blind lifting / lowering stopping device, there is one disclosed in Patent Document 1. This lifting / lowering stop device is composed of a turning lever and a micro switch. The turning lever is pivotally supported by the head box, and a lifting / lowering cord suspended from the take-up drum is inserted into the tip of the turning lever. The lifting / lowering cord, after passing through the distal end of the rotating lever, hangs down below the head box through a guide hole located below the distal end of the rotating lever, and from the base end of the rotating lever. The pressing part protrudes, and the pressing part can be brought into contact with and separated from the spring piece of the micro switch. When the lifting / lowering cord is in tension, the rotating lever rotates to the obstacle non-detection position with the tension acting from the lifting / lowering cord, and the pressing part presses the spring piece of the micro switch with this turning force, and the motor It is possible to operate. On the other hand, when the lifting / lowering cord is loosened, the urging force of the spring piece rotates the rotation lever in the direction separating the pressing portion from the spring piece of the micro switch, releasing the pressure of the spring piece and stopping the operation of the motor. An obstacle is detected and the vehicle is stopped.

JP 2007-177484 A

  However, in the conventional blind lifting / lowering stop device, since the micro switch is operated by the movement of the rotating lever, the relative relationship between the tip of the rotating lever and the position where the lifting / lowering cord hangs down. Is invariant, and there is a problem that the position of the lifting / lowering cord and the lifting / lowering stop device is not flexible.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a blind lifting / lowering stopping device capable of increasing the degree of freedom of the positions of the lifting / lowering cord and the lifting / lowering stopping device.

In order to achieve the above-mentioned object, the invention according to claim 1 is a rotating shaft that is rotatably supported in the head box, and a plurality of lifts that are provided in the head box and rotate in conjunction with the rotation of the rotating shaft. Ascending / descending movement of the blind by detecting slack of the lifting / lowering cord of the blind having a drum and a plurality of lifting / lowering cords coupled to the lifting / lowering drum so as to be wound and unwound and suspended from the head box. In the lift stop device that stops
The slider arranged so as to be able to reciprocate with respect to the head box, and the rotation of the elevating drum when the slider is in the neutral position of the reciprocating range, and the elevating drum when the slider is outside the neutral position of the reciprocating range A regulation means capable of releasing the regulation of rotation,
The slider can be approached from either side of the reciprocating range with respect to the neutral position.When the lifting / lowering cord is in tension, it is on either side of the neutral position, and when the lifting / lowering cord is loosened, the slider is in the neutral position. It is characterized by moving.

  The invention according to claim 2 is the invention according to claim 1, wherein the elevating cord can be suspended from at least two locations of the head box, and when the elevating cord hangs from the first position, When the lifting / lowering cord is pushed down in one direction so as to separate the slider from the neutral position in the tension state and the lifting / lowering cord hangs from the second position, the lifting / lowering cord separates the slider from the neutral position in the tension state of the lifting / lowering cord. It is characterized by extruding in the other direction.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein at least two guide portions capable of guiding the lifting / lowering cord are provided on the drum receiver that rotatably supports the lifting / lowering drum, and the guide portion is in a tensioned state. The lifting / lowering cord can be guided such that the lifting / lowering cord pushes out the slider.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the restricting means is a micro switch, and the slider is formed with a notch portion with which the tip of the spring piece of the micro switch contacts. The notch portion includes a bottom surface that receives the tip of the spring piece in a state where the slider is in a neutral position, and an inclined surface that is inclined so as to expand from both sides of the bottom surface toward the opening end portion. The inclined surface presses the spring piece of the microswitch when moving in any direction away from the neutral position.

  According to the present invention, since the slider can approach the neutral position from either side, the position of the lifting / lowering cord can be changed accordingly. The degree of freedom of position can be increased. Therefore, for example, a common lifting / lowering stop device can be used for different types of blinds in which the lifting / lowering cord hangs from the head box at different positions.

  Further, by providing at least two guide portions in the front-rear direction on the drum receiver, the position at which the lifting / lowering cord is suspended can be selected according to the type of blind.

  In addition, since the bottom surface of the notch and the inclined surfaces on both sides cooperate with the spring piece of the microswitch, the microswitch can be turned on and off reliably when approaching from either side of the slider. It can be carried out.

It is a front view of the blind which implements this invention. It is a disassembled perspective view of each member containing the raising / lowering stop apparatus of embodiment of this invention. It is a perspective view showing the state which assembled | attached each member shown in FIG. It is a fragmentary sectional view showing the raising / lowering drum part in a head box. FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. 4 (the lifting cord and the ladder cord are omitted). It is a top view showing embodiment of the raising / lowering stop apparatus of this invention. It is side sectional drawing showing distribution of the raising / lowering cord hanging from three different positions of the head box (elevating drum), (a) is the rear side of the head box (elevating drum), (b) is the head The front side of the box (elevating drum), (c) is the center of the head box (elevating drum). It is side sectional drawing which shows the state of the raising / lowering cord suspended from the back side of the head box (elevating drum), and the raising / lowering stop apparatus, (a) is a state when rotation of an raising / lowering drum is not controlled, (b) is Each of the states when rotation of the lifting drum is restricted is shown. It is side sectional drawing which shows the state of the raising / lowering cord suspended from the center of the head box (elevating drum) and the raising / lowering stop apparatus, (a) is a state when rotation of an raising / lowering drum is not controlled, (b) is raising / lowering. Each state when the rotation of the drum is restricted is shown. It is a top view which shows the state of the raising / lowering cord suspended from the back side of the head box (elevating drum) and the raising / lowering stop device, (a) is a state when rotation of the raising / lowering drum is not controlled, (b) is the raising / lowering. Each state when the rotation of the drum is restricted is shown. It is a top view which shows the state of the raising / lowering cord suspended from the center of the head box (elevating drum) and the raising / lowering stop device, (a) is the state when rotation of the raising / lowering drum is not regulated, (b) is the raising / lowering drum. Each of the states when the rotation of the is regulated is represented.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an example of a blind to which the lifting / lowering stop device of the present invention is applied. The blind 10 includes a head box 12, a ladder cord 16 hanging from the head box 12, and a shielding member 14 supported by the ladder cord 16. And a lifting / lowering cord 18 that can be hung from the head box 12 and can move the shielding member 14 up and down, and a bottom rail 19 that is positioned below the shielding member 14 and to which the lower end of the ladder cord 16 and the lifting / lowering cord 18 is connected. In this example, the shielding member 14 is composed of a large number of aligned slats, but is not limited thereto, and may be an arbitrary shielding member such as a screen.

  In the head box 12, a rotating shaft 20, a lifting drum 22, a rotating drum 24, a drum receiver 26, a power transformer 40, a power unit 42, a motor 44, and a control unit 46 are disposed.

  The rotating shaft 20 extends in the longitudinal direction of the head box 12 and can be rotated by a motor 44. The drive of the motor 44 is controlled by the control unit 46, and electric power is supplied to the motor 44 from the commercial power supply via the power transformer 40 and the power supply unit 42.

  A plurality of elevating drums 22 are provided at intervals in the longitudinal direction of the rotary shaft 20, and the upper end of the elevating cord 18 is connected to each elevating drum 22 so as to be wound and unwound. A rotary drum 24 is coaxially provided at one end of the elevating drum 22 via a drum hub 25, and each upper end of the vertical cord of the ladder cord 16 is connected to each rotary drum 24 so that it can be wound and unwound. Is done.

  The rotating shaft 20 passes through the shaft centers of the elevating drum 22 and the rotating drum 24, the elevating drum 22 rotates integrally with the rotation of the rotating shaft 20, and the rotating drum 24 is interlocked with the rotation of the elevating drum 22. Thus, it is configured to rotate integrally with a predetermined angle, but to rotate idle beyond that.

  As shown in FIGS. 2 to 4, each elevating drum 22 and each rotary drum 24 are rotatably supported with respect to a drum receiver 26 fixed to the head box 12.

  As shown in FIG. 5, five openings 26 a, 26 b, 26 c, 26 b, and 26 a into which the elevating cord 18 and the ladder cord 16 can be inserted are formed on the bottom surface of the drum receiver 26. The openings 26a, 26a, and 26c are for insertion of the lifting / lowering cord 18, and the lifting / lowering cord 18 is inserted through any one of the three openings. The openings 26 b and 26 b are for inserting the upper ends of the two vertical cords of the ladder cord 16. In this example, the openings 26 a, 26 b, 26 c, 26 b, 26 a are front and rear so that the lifting / lowering cord 18 and the ladder cord 16 can hang from the head box 12 at substantially the same position in the longitudinal direction of the head box 12. It is substantially aligned in the direction and symmetrically formed in the front and rear.

  In a portion corresponding to the boundary between the elevating drum 22 and the rotary drum 24 of the drum receiver 26, a ladder code guide portion for arranging the two vertical cords of the ladder cord 16 obliquely from the rotary drum 24 to the opening 26b. Is provided. As shown in FIG. 4, the ladder code guide portion includes an upper guide portion 26d that guides each vertical cord from above and a lower guide portion 26e that guides each vertical cord from below. The upper guide portion 26d is formed near the lower portion of the rotary drum 24, and the contact surface with the ladder cord 16 is a smooth curved surface. The lower guide portion 26e is formed near the upper portion of the opening 26b at a position obliquely below the upper guide portion 26d, and the contact surface with the ladder cord 16 is a smooth curved surface. By guiding with the two upper guide portions 26d and the lower guide portions 26e, the two vertical ladder cords 16 of the ladder cord 16 are smaller than the diameter of the rotary drum 24 from the front and rear sides of the rotary drum 24, respectively. The openings 26b and 26b can be arranged with a low resistance obliquely downward and with their front and rear widths gradually becoming smaller.

  Furthermore, a separator 30 and a drum cover 32 are attached to the drum receiver 26 so as to correspond to the upper portions of the openings 26a to 26c.

  As shown in FIG. 5, the separator 30 is fixed to the front and rear portions of the drum receiver 26, and surrounds a substantially lower half of the lower part in the circumferential direction in the vicinity of the end of the lifting drum 22 on the rotary drum 24 side. The remaining upper half of the lifting drum 22 is surrounded by a drum cover 32, and the lower end of the drum cover 32 is connected to the upper end of the separator 30. A gap is formed between the separator 30 and the drum cover 32 and the elevating drum 22 so that one elevating cord 18 can be inserted, so that the elevating cord 18 does not overlap each other and is tightly wound around the elevating drum 22. It is supposed to be.

  As shown in FIG. 5, the separator 30 is formed with a first insertion hole 30a, a second insertion hole 30b, and a third insertion hole 30c through which the lifting / lowering cord 18 is inserted at three positions in the front-rear direction. The 26 openings 26a, 26c, and 26a communicate with each other. As a result, the lifting / lowering cord 18 from the lifting / lowering drum 22 is inserted into one of the insertion holes 30a, 30b, and 30c, and passes through one of the corresponding openings 26a, 26c, and 26a of the drum receiver 26. Hanging from the box 12. Of the wall surfaces of the separator 30 forming the insertion holes 30a, 30b, 30c, the wall surface of the lifting / lowering cord 18 on the winding direction side of the lifting / lowering drum 22 is formed with a smooth curved surface that guides the lifting / lowering cord 18, respectively. A portion 30d, a second guide portion 30e, and a third guide portion 30f are formed. Further, a first through hole 30g and a second through hole 30h penetrating the first insertion hole 30a and the second insertion hole 30b of the separator 30 are respectively formed on the side walls (see FIG. 2). .

  In addition, an elevator stop device according to the present invention is disposed at the bottom of the drum receiver 26. The lifting / lowering stop device according to the present invention has a micro switch (regulating means) 36 and a slider 38. For this reason, the bottom of the drum receiver 26 houses the micro switch 36 and the slider 38 as shown in FIG. A recess 26g is formed, and a guide groove 26h for guiding the reciprocating motion of the drum receiver 26 of the slider 38 in the front-rear direction is formed. The guide groove 26h is formed over the entire length of the drum receiver 26 in the front-rear direction.

  The micro switch 36 is restrained so as not to move within the recess 26 g of the drum receiver 26. The microswitch 36 has a spring piece 36a that is always urged away from the main body, and a roller 36b is attached to the tip of the spring piece 36a. Further, a contact 36 c is provided near the base of the spring piece 36 a of the main body of the micro switch 36.

  As shown in FIG. 2, the slider 38 has a cylindrical main body, and a protrusion 38a is formed on the outer peripheral surface of the slider 38 over the entire length with a 180 degree separation in the circumferential direction. Protruding pieces 38b projecting in a diametrical direction at positions 90 degrees apart in the circumferential direction, and diametrically projecting at both axial ends of the slider 38 at a position 180 degrees circumferentially away from the projecting pieces 38b. A first locking piece 38e and a second locking piece 38f are respectively formed. The protruding piece 38b is disposed so as to be positioned on the microswitch 36 side, and one of the two protruding ridges 38a is fitted into the guide groove 26h of the drum receiver 26. As a result, the slider 38 can slide in the front-rear direction of the drum receiver 26 along the guide groove 26h. Further, the first locking piece 38e and the second locking piece 38f of the slider 38 pass through the first through hole 30g and the second through hole 30h of the separator 30, respectively. Is prevented from falling off the guide groove 26h from the guide groove 26h.

  The projecting piece 38b of the slider 38 is formed with a notch for receiving the roller 36b at the tip of the spring piece 36a of the micro switch 36. As best shown in FIG. And two inclined surfaces 38d that are inclined so as to expand from both sides of the bottom surface 38c toward the opening end of the notch.

  When the roller 36b at the tip of the spring piece 36a of the micro switch 36 is in contact with any one of the inclined surfaces 38d in the front and rear sliding range along the guide groove 26h of the slider 38, the inclined surface 38d is in contact with the micro switch 36. Therefore, the contact 36c is in a pressed state, and the output signal of the microswitch 36 is an off signal.

  On the other hand, when the slider 38 slides back and forth along the guide groove 26h to reach the neutral position, the roller 36b at the tip of the spring piece 36b of the microswitch 36 abuts on or is received by the bottom surface 38c. The 36 spring pieces 36a are separated from the contact point 36c by the biasing force. As a result, the output signal of the micro switch 36 becomes an ON signal, and is input to the control unit 46 to stop the driving of the motor 44.

  As described below, the first locking piece 38e and the second locking piece 38f of the slider 38 can be pressed by the tension of the lifting / lowering cord 18 depending on the position where the lifting / lowering cord 18 is arranged. The slider 38 is urged by the tension of the lifting / lowering cord 18.

  In this example, the lifting / lowering cord 18 can be distributed in three ways as shown in FIGS. 7A, 7B and 7C using the same lifting drum 22 and drum receiver 26. For example, in the case of a type that does not allow the lifting / lowering cord to penetrate the slat as the shielding material as in the high shielding type, a hole for inserting the lifting / lowering cord 18 into the slat as the shielding material 14 is not formed, and the lifting / lowering cord is not formed. 18 hangs down the front side or the rear side of the shielding material 14, and therefore, the arrangement that hangs down from the rear side and the front side of the head box 12 as shown in FIGS. 7A and 7B is one. It is good to prepare for the blinds. Further, in the case of a type in which the lifting / lowering cord penetrates through the slat as the shielding material like a standard type blind, it is provided with a distribution that hangs down from the center position in the front-rear direction of the head box 12 as shown in FIG. Good.

  As shown in FIG. 7A, when the lifting / lowering cord 18 is hung on the rear side of the shielding material 14, the lifting / lowering cord 18 is brought into contact with and separated from the lifting / lowering drum 22 on the rear side of the lifting / lowering drum 22. Is guided to the rearmost first guide portion 30d to pass through the first insertion hole 30a, the rear side of the first locking piece 38e on the rear side of the slider 38 of the lifting / lowering stop device is suspended, and the opening 26a is opened. Insert and hang from the head box 12. Here, the first guide portion 30d has the lifting / lowering cord 18 so that the lifting / lowering cord 18 pushes the first locking piece 38e when the lifting / lowering cord 18 is in a tensioned state, and the slider 38 is separated from the neutral position in one direction. To guide you. In this way, since the lifting / lowering cord 18 hangs from the rear side of the head box 12, the lifting / lowering cord 18 can be suspended from the rear side of the shielding member 14.

  As shown in FIG. 7B, when the lifting / lowering cord 18 is suspended from the front side of the shielding member 14, the lifting / lowering cord 18 is brought into contact with and separated from the lifting drum 22 on the front side of the lifting / lowering drum 22, The third guide hole 30c is guided through the third guide hole 30c on the front side, and the opening 26a is inserted through the third insert hole 30c to be suspended from the head box 12. Thereby, since the lifting / lowering cord 18 hangs from the front side of the head box 12, the lifting / lowering cord 18 can be suspended from the front side of the shielding member 14. Since the distribution shown in FIG. 7B is used simultaneously with the distribution shown in FIG. 7A, the lifting / lowering stop device can be omitted from the distribution shown in FIG. 7B.

  As shown in FIG. 7C, when the lifting / lowering cord 18 is inserted and suspended in the hole in the center in the front-rear direction of the shielding member 14, the lifting / lowering cord 18 contacts and separates from the lifting / lowering drum 22 at the center of the lifting / lowering drum 22. The lifting / lowering cord 18 is guided to the second guide portion 30e in the center to be inserted through the second insertion hole 30b, and the front side of the second locking piece 38f on the front side of the slider 38 of the lifting / lowering stop device is suspended, and the opening portion 26c. And is suspended from the head box 12. Here, when the lifting / lowering cord 18 is in a tension state, the second guide portion 30e pushes the lifting / lowering cord 18 so that the second locking piece 38f is pushed out and the slider 38 is separated from the neutral position in the other direction. 18 is guided. Thus, since the lifting / lowering cord 18 hangs from the center of the head box 12, the lifting / lowering cord 18 can be suspended by being inserted through a hole formed in the center of the shielding member 14.

  In this way, it is possible to realize any one of the three types of lifting cord 18 for the drum receiver 26 and the lifting stop device having the same configuration and arrangement.

  In the blind 10 in which the lifting / lowering cord 18 is arranged as shown in FIG. 7 (a), when the lifting / lowering cord 18 is in a tension state, the lifting / lowering cord 18 is moved as shown in FIGS. 8 (a) and 10 (a). The first locking piece 38e of the slider 38 is pressed so that the slider 38 slides away from the neutral position in one direction, and the roller 36b at the tip of the spring piece 36a of the microswitch 36 is inclined on one side. Located on the surface 38d. As a result, an off signal is output from the microswitch 36, and normal operation is performed. Therefore, the motor 44 can be driven, and when the motor 44 operates, the elevating drum 22 rotates and the elevating cord 18 is wound or unwound. Further, the rotary drum 24 rotates and tilts the shielding material 14.

  On the other hand, when the bottom rail 19 comes into contact with an obstacle when the shielding member 14 is lowered, and the slack of the lifting / lowering cord 18 occurs, the pressing force from the lifting / lowering cord 18 is applied to the first locking piece 38e of the slider 38. As shown in FIGS. 8B and 10B, the tip of the spring piece 36a of the micro switch 36 is pressed by the pressing force that the spring piece 36a of the micro switch 36 presses the inclined surface 38d. The roller 38b rolls and the slider 38 slides to a neutral position where it abuts or is received by the bottom surface 38c of the slider 38. Thereby, the signal of the micro switch 36 becomes an ON signal, and the drive of the motor 44 is stopped. Therefore, the rotation of the lifting drum 22 is stopped, and it is possible to prevent the lifting cord from being continuously unwound while being loosened.

  In the blind 10 in which the lifting / lowering cord 18 is arranged as shown in FIG. 7 (c), when the lifting / lowering cord 18 is in a tension state, the lifting / lowering cord 18 is moved as shown in FIGS. 9 (a) and 11 (a). The second locking piece 38f of the slider 38 is pressed so that the slider 38 slides away from the neutral position in the other direction, and the roller 36b at the tip of the spring piece 36a of the microswitch 36 is inclined to the other side. Located on the surface 38d. As a result, an off signal is output from the microswitch 36, and normal operation is performed. Therefore, when the motor 44 is operated, the elevating drum 22 rotates and the elevating cord 18 is wound or unwound. Further, the rotary drum 24 rotates and tilts the shielding material 14.

  On the other hand, when the bottom rail 19 comes into contact with an obstacle when the shielding member 14 is lowered, and the slack of the lifting / lowering cord 18 occurs, the pressing force from the lifting / lowering cord 18 is applied to the second locking piece 38f of the slider 38. As shown in FIGS. 9 (b) and 11 (b), the tip of the spring piece 36a of the micro switch 36 is pressed by the pressing force with which the spring piece 36a of the micro switch 36 presses the inclined surface 38d. The roller 38b rolls and the slider 38 slides to a neutral position where it abuts or is received by the bottom surface 38c of the slider 38. Thereby, the signal of the micro switch 36 becomes an ON signal, and the drive of the motor 44 is stopped. Therefore, the rotation of the lifting drum 22 is stopped, and it is possible to prevent the lifting cord from being continuously unwound while being loosened.

  Thus, in the lifting / lowering stopping device of the present invention, since the slider 38 can slide to the neutral position from any sliding direction in the front-rear direction, the drum receiver 26, the lifting / lowering stopping device, the lifting drum 22, and the rotation It is possible to cope with different types of blinds such as a high shielding type or a standard type only by changing the arrangement of the lifting / lowering cord 18 without changing the parts and configuration of the drum 24 and the like. The degree of freedom of the position can be increased.

  Moreover, the lifting / lowering cord 18 is wound around the lifting / lowering drum 22 in the reverse direction only by reversing the mounting direction of the lifting / lowering stop device, the separator 30 and the drum cover 32 with respect to the drum receiver 26 to the left and right of the embodiment. Can also handle blinds.

  In the above description, the electric blind is intended, but the present invention is not limited to this, and the present invention can also be applied to a manual blind. In that case, it is preferable that the restricting means be able to restrict the rotation of the elevating drum 22 via the elevating drum 22 or the rotating shaft 20 or to release the restriction of the rotation according to the sliding of the slider 38. Further, as a means for sliding the slider 38 to the neutral position, the pressing force by which the spring piece 36a of the microswitch 36 presses the inclined surface 28d is used, but a spring provided separately so that the slider 38 is in the neutral position. The slider 38 may be urged by a spring with a force weaker than the pressing force of the lifting / lowering cord 18 in a tension state.

DESCRIPTION OF SYMBOLS 10 Blind 12 Head box 14 Shielding material 18 Elevating cord 20 Rotating shaft 22 Elevating drum 26 Drum receiver 30d 1st guide part 30e 2nd guide part 36 Micro switch (regulating means) (elevation stopping device)
36a Spring piece (lifting / stopping device)
36b Roller (tip)
38 Slider 38c Bottom (notch)
38d Inclined surface (notch)

Claims (4)

A rotary shaft (20) rotatably supported in the head box (12), and a plurality of lifting drums (22) provided in the head box (12) and rotating in conjunction with the rotation of the rotary shaft (20) The blind (10), which is connected to the lifting drum (22) so as to be wound and unwound and has a plurality of lifting cords (18) that can be hung from the head box (12) and lift the shielding material (14). In the lifting / lowering stopping device that detects the slack of the lifting / lowering cord (18) and stops the lifting / lowering operation of the blind,
The slider (38) disposed so as to be able to reciprocate with respect to the head box (10), and when the slider (38) is in the neutral position of the reciprocating range, the rotation of the elevating drum (22) is restricted, and the slider (38 ) Includes a regulating means (36) capable of releasing the regulation of the rotation of the elevating drum (22) when it is outside the neutral position of the reciprocating range,
The slider (38) is accessible from either side of the reciprocating range with respect to the neutral position, and when the lifting / lowering cord (18) is in a tension state, the slider (38) is on either side of the neutral position. A lifting / lowering stop device for a blind, characterized in that when it loosens, it moves to a neutral position.   The lifting / lowering cord (18) can be suspended from at least two locations of the head box (12), and when the lifting / lowering cord (18) hangs from the first position, the lifting / lowering cord (18) is lifted / lowered in a tension state. When the cord (18) pushes the slider (38) in one direction so as to be separated from the neutral position, and the lifting cord (18) hangs from the second position, the lifting cord is in the tension state of the lifting cord. The blind lifting / lowering stop device according to claim 1, wherein (38) is pushed in the other direction so as to be separated from the neutral position.   The drum receiver (26) that rotatably supports the elevating drum (22) is provided with at least two guide portions (30d, 30e) capable of guiding the elevating cord (18), and the guide portion has a tensioned elevating cord. The blind lifting / lowering stop device according to claim 1 or 2, characterized in that the lifting / lowering cord (18) can be guided so as to push out the slider (38).   The restricting means is a micro switch (36), and the slider (38) is formed with a notch that abuts the tip (36b) of the spring piece (36a) of the micro switch (36). ) In a neutral position, a bottom surface (38c) that receives the tip (36b) of the spring piece (36a), and an inclined surface that inclines so as to expand from both sides of the bottom surface (38c) toward the opening end ( 38d), and when the slider moves in any direction away from the neutral position, the inclined surface (38d) presses the spring piece (36a) of the microswitch (36). Item 4. The blind lifting / lowering stop device according to any one of items 1 to 3.

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