JP5595062B2 - Roll screen - Google Patents

Description

  The present invention relates to a roll screen capable of winding a screen by a spring force stored in a winding spring built in a winding pipe.

  Conventionally, in this type of roll screen, a take-up pipe has a built-in clutch mechanism, and the clutch mechanism can be temporarily fixed in a state where the screen is pulled out from the take-up pipe by a desired length. When the screen is removed from the take-up pipe for replacement or washing, the screen is completely pulled out from the take-up pipe against the spring force of the take-up spring, and the screen is taken up in the direction in which the screen is taken up by the take-up pipe. Pipe rotation is blocked by the clutch mechanism. Thus, since all the screens are pulled out from the winding pipe and temporarily fixed by the clutch mechanism, the screen can be removed from the winding pipe.

  However, in the conventional roll screen, when the winding pipe is unintentionally rotated by a predetermined angle or more, the clutch mechanism is released and the winding pipe is rotated by the spring force of the winding spring, so that the winding pipe is wound. There was a problem that the initial winding by the spring was released. Here, the initial winding means a spring force in the winding direction of the screen stored in the winding spring in a state where the screen is completely wound on the winding pipe.

  For example, Patent Documents 1 and 2 disclose roll screens and roll blinds having a mechanism for solving this problem. In the roll screen shown in Patent Document 1, one end of the take-up spring is configured to be fixed to a support means disposed on the side of the take-up pipe, and the other end of the take-up spring is connected to the take-up pipe. Moreover, it is comprised so that the spring force provided to the winding spring can be released without rotating a winding pipe by hold | maintaining in the state which cancelled | released fixing of the end of the winding spring by a support means. In the roll screen configured as described above, one end of the winding spring can be held in the unlocked state, so that one end of the winding spring can be released in this unlocked state to completely cancel the spring force. it can. In such a state in which the spring force is completely released, the winding spring does not rotate unintentionally, so that the screen can be replaced with peace of mind.

  Moreover, in the roll blind shown by patent document 2, a winding shaft is rotatably supported by a pair of side bracket surface fixed to a mounting surface, and a winding shaft is rotated by drooping a screen from a winding shaft. Thus, the screen is configured to move up and down. Also, the urging means urges the take-up shaft in the screen take-up direction in the take-up shaft, and the rotation of the take-up shaft due to the urging force of the urging means is prevented by the clutch device and the screen is suspended at a desired position. Configured to support down. Further, the stopper device for preventing the rotation of the winding shaft has a lock rod inserted into the side bracket and the pipe cap at the end of the winding shaft. In the roll blind constructed as described above, the lock rod is inserted into the side bracket and the pipe cap at the end of the take-up shaft to prevent unnecessary release of the clutch device when the screen is attached to or detached from the take-up shaft. it can.

JP 2006-225992 A (Claim 1, paragraph [0015]) JP 2007-277779 (Claim 1, paragraph [0016]), paragraph [0026])

  However, in the roll blind shown in the above-mentioned conventional patent document 1, when the used screen is removed from the winding pipe, the spring force of the winding spring is completely released. After attaching to the take-up pipe, it is necessary to apply the released spring force to the take-up spring, and there is a problem that it takes a lot of time to attach and detach the screen. Moreover, in the conventional roll blind shown in Patent Document 2, a lock bar that is used only when the screen is replaced or washed is required as a separate part, so that the lock bar may be lost. Furthermore, in the conventional roll blind shown in Patent Document 2, the end cover is usually attached to the side bracket to improve the appearance, but the lock rod is inserted into the side bracket and the pipe cap at the end of the winding shaft. When this is done, it is necessary to remove the end cover or to make a hole for inserting the lock rod into the end cover, which may reduce workability or impair the appearance of the end cover.

  The object of the present invention is to prevent the spring force of the winding spring from being unintentionally released when the screen is removed from the winding pipe or attached to the winding pipe in order to replace or wash the screen. Another object of the present invention is to provide a roll screen that can be easily removed and attached in a relatively short time without losing parts and without losing its appearance.

  As shown in FIGS. 1 to 4 and 7, a first aspect of the present invention is that a winding pipe 12 that winds a screen 11 so as to be drawable is rotatably supported by a pair of support members 13 and 14. In a roll screen configured so that a take-up spring 16 is built in the take-up pipe 12 and a spring force for rotating the screen 11 in a direction to take up the screen 11 in the take-up pipe 12 is stored in the take-up spring 16. One end of 16 is attached to one support member 13 via a spring force holding mechanism 36, and the other end of the winding spring 16 is connected to the winding pipe 12, and the spring force holding mechanism 36 is stored in the winding spring 16. It is configured to hold the spring force unreleasably at an arbitrary drawing position of the screen 11.

  The second aspect of the present invention is an invention based on the first aspect, and further, as shown in FIGS. 1 to 4, the spring force holding mechanism 36 rotates the winding pipe 12 together with the winding spring 16. It is characterized by comprising switching means 37 for switching between a spring rotation position and a free rotation position where the winding pipe 12 rotates freely independently of the winding spring 16.

  The third aspect of the present invention is an invention based on the second aspect, and as shown in FIGS. 1 to 4 and 6, the switching means 37 is slidable in the winding pipe 12 in the axial direction. And a slide member 38 that is non-rotatable in the circumferential direction, and a movable piece 39 that is provided on one of the support members 13 and that is switched between a spring rotation position and a free rotation position when the slide member 38 is engaged and disengaged. It is characterized by having.

  In the roll screen according to the first aspect of the present invention, the spring force holding mechanism holds the spring force stored in the take-up spring in an unreleasable state at any drawing position of the screen, so that the screen is completely or almost completely removed from the take-up pipe. If the spring force of the take-up spring is held unreleasable by the spring force holding mechanism in the pulled-out state, the take-up pipe rotates more than a predetermined angle when the screen is removed from or attached to the take-up pipe. Even so, the spring force of the winding spring is not unintentionally released. As a result, it is possible to carry out the work relatively easily without deliberately attaching and detaching the screen to the take-up pipe. Therefore, this work can be easily carried out in a very short time. In addition, the roll screen of the present invention does not require the use of the above-mentioned lock bar, compared with the conventional roll blind, which may have lost the lock bar, which is a separate part used only when the screen is replaced or washed. There is no such thing as a lost rod. Furthermore, in order to insert the lock rod into the side bracket and the pipe cap at the end of the winding shaft, by removing the end cover or making a hole for inserting the lock rod in the end cover, workability may be reduced or Compared with the conventional roll blind, which may impair the appearance of the end cover, the roll screen of the present invention does not require the end cover to be removed when attaching and detaching the screen to the take-up pipe. Since it is not necessary to open, the above-described detachment workability is not deteriorated, and the appearance of the end cover is not impaired.

  In the roll screen according to the second aspect of the present invention, when the switching means is switched to the free rotation position in a state where the screen is not pulled out or slightly pulled out from the winding pipe, the winding pipe is turned into the winding spring. Therefore, the screen can be pulled out from the take-up pipe without applying any spring force of the take-up spring to the take-up pipe. As a result, the operation of pulling out the screen from the winding pipe is facilitated. Further, when the switching means is switched to the free rotation position after all or almost all of the screen is pulled out from the winding pipe, when the screen is pulled out from the winding pipe, the screen is pulled out against the spring force of the winding spring. Although necessary, the screen can be wound around the take-up pipe by the spring force of the take-up spring by switching one of the replaced or washed screens to the take-up pipe and then switching the switching means to the spring rotation position. . As a result, the work of winding the screen around the winding pipe is facilitated.

  In the roll screen according to the third aspect of the present invention, when the sliding member of the switching means is locked to the movable piece in a state where the screen is not pulled out from the winding pipe or is slightly pulled out, the switching means is Since the winding pipe is freely rotated independently of the winding spring by switching to the free position, the screen is wound without applying the spring force of the winding spring to the winding pipe as described above. Can be withdrawn from the intake pipe. As a result, the operation of pulling out the screen from the winding pipe is facilitated. When the slide member of the switching means is locked to the movable piece with all or almost all the screen pulled out from the winding pipe, the switching means is switched to the free position, and the winding pipe is connected to the winding spring. Since the screen rotates independently, it is necessary to pull out the screen against the spring force of the winding spring when pulling the screen out of the winding pipe. After the mounting, the slide member of the switching means is detached from the movable piece, and the switching means is switched to the spring rotation position, so that the screen can be wound around the winding pipe by the spring force of the winding spring as described above. it can. As a result, the work of winding the screen around the winding pipe is facilitated.

It is the sectional view on the AA line of FIG. 3 which shows the roll screen of this invention embodiment. It is the BB sectional view taken on the line of FIG. It is CC sectional view taken on the line of FIG. 1 which shows the state which removed the case for initial winding adjustment. It is the DD sectional view taken on the line of FIG. 2 which shows the state which removed the case for initial winding adjustment. It is the EE sectional view taken on the line of FIG. It is a principal part perspective view which shows the state just before attaching a slide member to a winding pipe. It is a longitudinal cross-sectional view of the roll screen.

  Next, an embodiment for carrying out the present invention will be described with reference to the drawings. As shown in FIG. 7, the roll screen 10 includes a winding pipe 12 that winds the screen 11 so that the screen 11 can be pulled out, a pair of side plates 13 and 14 that rotatably support both ends of the winding pipe 12, and a winding. A winding spring 16 incorporated in the pipe 12. A set frame 17 extending in the horizontal direction is provided on the upper edge of the window frame of the room. The pair of side plates 13 and 14 are attached to both ends of the set frame 17, and the winding pipe 12 is rotatably supported by the side plates 13 and 14. In the winding pipe 12, from the side plate 13 side (right side in FIG. 7) to the other side plate 14 side (left side in FIG. 7), the initial winding adjusting device 18, the constant braking device 19, and the overspeed The hour braking device 21 and the operation clutch 22 are arranged in this order.

  As shown in FIGS. 1 and 2, the initial winding adjusting device 18 has a cross hole 23 a that is rotatably attached to one side plate 13 and into which a tip of a plus driver (not shown) can be inserted at one end face. The formed adjusting shaft 23, an intermediate shaft 24 having one end coupled to the other end of the adjusting shaft 23 so as not to rotate relative to the other end, and an output having one end coupled to the other end of the intermediate shaft 24 so as to be swingable by a predetermined angle. A shaft 26, a fixing ring 27 fixed to one side plate 13 so as to surround the outer peripheral surface of the adjustment shaft 23, and an outer peripheral edge of the fixing ring 27 are provided so as to be rotatable relative to the fixing ring 27. The rotary ring 28 includes an initial winding adjustment case 29 attached to the rotary ring 28 so as to accommodate one end of the output shaft 26 and the intermediate shaft 24. An initial winding clutch spring 31 is accommodated between the initial winding adjusting case 29 and the output shaft 26 (FIGS. 1, 2, and 5). This initial winding clutch spring 31 is a torsion coil spring, which allows the adjustment shaft 23 to rotate in a direction in which a spring force is applied to the winding spring 16 and releases the spring force applied to the winding spring 16. Has a function of preventing rotation of the adjusting shaft 23. A pipe insertion member 12a is inserted into one end of the winding pipe 12, and one end of the winding pipe 12 is fitted into the initial winding adjustment case 29 via the pipe insertion member 12a so as to be relatively rotatable.

  One end of a fixed shaft 32 is coupled to the other end of the output shaft 26 so as not to be relatively rotatable, and a moving wheel 33 is fitted to the other end of the fixed shaft 32 so as to be relatively rotatable (FIGS. 1, 2, and 7). The moving wheel 33 is inserted into the winding pipe 12 in a relatively non-rotatable manner, and a fixed wheel 34 is fitted into one end of the fixed shaft 32 in a relatively non-rotatable manner. The winding spring 16 is a torsion coil spring. One end of the winding spring 16 is attached to one side plate 13 via a fixed ring 34, an initial winding adjusting device 18, and a spring force holding mechanism 36, and the other end of the winding spring 16 is wound via a moving wheel 33. It is coupled to the intake pipe 12. Then, by rotating the adjustment shaft 23, a spring force for rotating the screen 11 in the winding direction of the winding pipe 12 is stored in the winding spring 16.

  The spring force holding mechanism 36 has a spring rotation position where the winding pipe 12 rotates together with the winding spring 16 (FIGS. 1 and 3), and the winding pipe 12 rotates freely independently of the winding spring 16. A switching means 37 for switching to any one of the free rotation positions (FIGS. 2 and 4) is provided. The switching means 37 is slidable in the axial direction on the take-up pipe 12 and non-rotatably mounted in the circumferential direction, and the slide member 38 provided on one side plate 13 engages and disengages. Accordingly, there is a movable piece 39 that switches between the spring rotation position and the free rotation position. The slide member 38 has an outer diameter that is slightly larger than the outer diameter of the winding pipe 12 and an inner diameter that is slightly larger than the outer diameter of the rotating ring 28 and the outer diameter of the initial winding adjustment case 29. The slide ring part 38a which contacts the one end surface of 12 removably, and the three slide protrusions which were provided integrally with the slide ring part 38a and protruded radially inward from the inner peripheral surface of the slide ring part 38a 38b, and three slide legs 38c that are provided integrally with these protrusions 38b and extend in parallel to the center line of the slide ring portion 38a from the tip of the protrusion 38b (FIGS. 1 to 4 and FIG. 6). ). The three slide protrusions 38b and the three slide leg portions 38c are arranged at equal intervals (every 120 degrees) in the circumferential direction on the slide ring portion 38a.

  The three slide legs 38c are slidably inserted in the winding pipe 12 in the axial direction and are non-rotatable in the circumferential direction. Specifically, on the outer peripheral surface of the pipe insertion member 12a inserted into one end of the winding pipe 12, three insertion recesses 12b extending in the axial direction at regular intervals (every 120 degrees) in the circumferential direction. Are formed, and the three slide legs 38c are slidably inserted into these insertion recesses 12b (FIGS. 1, 2, and 6). In the vicinity of the tips of these slide legs 38c, resistance application protrusions 38d that provide resistance to sliding of the slide legs 38c in the axial direction are provided. Further, the fixing ring 27 is formed with three fixing recesses 27 a that are equally spaced in the circumferential direction (every 120 degrees) and that extend toward the center of the fixing ring 27. The rotating ring 28 is formed with three rotating grooves 28a extending in the radial direction at regular intervals (every 120 degrees) in the circumferential direction. Further, the case 28 for initial winding adjustment is formed with three case recesses 29a that are equally spaced in the circumferential direction (every 120 degrees) and extend toward the center of the case 28. Each rotation groove 28a and each case recess 29a are arranged to coincide with each other, and each slide groove 38a can be inserted into each rotation groove 28a and each case recess 29a. .

  The movable piece 39 is housed in the three fixing recesses 27a and urged by the compression coil spring 41 so as to protrude outward from the fixing recesses 27a (FIGS. 3 and 4). The three movable pieces 39 are rotated at the front end when the rotating ring 28 and the initial winding adjustment case 29 are rotated so that the rotating concave groove 28a and the case concave portion 29a coincide with the fixing concave portion 27a. It is comprised so that it may protrude in 28a. In addition, an inclined surface 39a is formed on the surface of the distal end portion of the movable piece 39 that faces the slide projecting piece 38b so as to be lowered toward the distal end. Further, a pair of engaged protrusions 27b and 27b are provided so as to protrude toward each other on the outer end side portion of the fixing recess 27a, and a pair of engagement protrusions 39b and 39b are provided on the proximal end side portion of the movable piece 39. Protruding in directions away from each other. The engaging protrusion 39b of the movable piece 39 is engaged with the engaged protrusion 27b of the fixing recess 27a, thereby preventing the base end portion of the movable piece 39 from jumping out of the fixing recess 29a.

  When the slide protrusion 38 b of the slide member 38 is pressed against the inclined surface 39 a of the movable piece 39, the distal ends of the three movable pieces 39 resist the elastic force of the compression coil spring 41 and are within the three fixing recesses 27. And the switching means 37 is switched to the free position, so that the winding pipe 12 freely rotates independently of the winding spring 16, and the spring force stored in the winding spring 16 is arbitrarily applied to the screen 11. It is comprised so that it cannot hold | maintain in the drawer position (FIGS. 2 and 4). Further, when the slide projecting piece 38b is detached from the movable piece 39, the tip ends of the three movable pieces 39 project into the three rotating grooves 28a by the elastic force of the compression coil spring 41, and the switching means 37 is provided with the spring. When the operation clutch 22 is allowed to rotate in the winding direction of the winding pipe 12 due to the spring force of the winding spring 16 to switch to the rotating position, the spring force stored in the winding spring 16 is applied to the winding pipe. 12 (FIGS. 1 and 3).

  As shown in FIG. 7, the operation clutch 22 includes an operation clutch fixed shaft 22 a that is rotatably supported by the other side plate 14, and an operation clutch case 22 b that is rotatably supported by the other side plate 14. The operation clutch drum 22c fitted to the operation clutch fixed shaft 22a and formed with a cam groove (not shown) on the outer peripheral surface, and the shaft of the operation clutch fixed shaft 22a on the inner peripheral surface of the operation clutch case 22b. A guide groove (not shown) formed extending in the direction, and a rolling element (not shown) for an operation clutch that rolls in a space where the cam groove and the guide groove overlap. The other end of the winding pipe 12 is fitted into the operation clutch case 22b so as not to be relatively rotatable. When the screen 11 is slightly pulled out and released in a state in which the spring force of the take-up spring 16 is acting on the take-up pipe 12 in the direction in which the screen 11 is taken up, the operation clutch 22 is caused by the spring force of the take-up spring 16. When the screen 11 is slightly pulled out and released in a state where the winding pipe 12 is prevented from rotating in the winding direction and the winding pipe 12 is prevented from rotating in the winding direction, the spring force of the winding spring 16 is released. The winding pipe 12 is configured to be allowed to rotate in the winding direction.

  The constant braking device 19 includes a constant braking clutch 42 and a constant rotary damper 43 (FIG. 7). The constant braking clutch 42 has a constant clutch case 42a and a constant clutch mechanism 42b. The constant rotary damper 43 includes a constant damper case 43a, a constant damper shaft 43b loosely inserted in the case 43a, and a constant damper rotation resistance applying portion (between the case 43a and the shaft portion 43b). (Not shown). The constant damper shaft 43b is provided so as to extend from the constant damper case 43a into the constant clutch case 42a. One end of the constant damper shaft 43b is coupled to the other end of the fixed shaft 32 so as to be relatively rotatable. The constant damper case 43a is configured to rotate integrally with the winding pipe 12 via the constant clutch case 42a and the driving wheel 33. When the winding pipe 12 rotates in the winding direction of the screen 11, the constant damper shaft 43 b is always fixed to the fixed shaft 32 by the clutch mechanism 42 b, and an effective rotational resistance is generated at the constant damper rotational resistance applying portion. For this reason, when the rotation of the damper case 43a and the winding pipe 12 is suppressed and the winding pipe 12 rotates in the drawing direction of the screen 11, the damper portion 43b is always fixed to the fixed shaft 32 by the clutch mechanism 42b. In addition, since an effective rotational resistance is not generated in the constant damper rotational resistance applying portion, the constant damper shaft portion 43 b is configured to always rotate together with the damper case 43 a and the winding pipe 12. That is, the rotary damper 43 always generates a rotational resistance at the rotation applying portion for the damper during winding of the screen 11, so that the winding pipe 12 is always decelerated and the rotation resistance for the damper is always applied while the screen 11 is being pulled out. Since no rotational resistance is generated in the portion, the take-up pipe 12 is configured not to decelerate. Thus, the constant braking device 42 always decelerates the rising speed of the screen 11.

  The over-rotation braking device 21 includes an over-rotation rotary damper 44 and an over-rotation braking clutch 46 (FIG. 7). The over-rotation rotary damper 44 includes an over-rotation damper case 44a, an over-rotation damper shaft 44b loosely inserted in the case 44a, and an over-rotation interposed between the case 44a and the shaft 44b. A damper rotational resistance applying portion (not shown). The over-rotation braking clutch 46 includes an over-rotation clutch case 46a, an over-rotation clutch guide shaft 46b loosely inserted in the case 46a, and an over-rotation inserted between the case 46a and the guide shaft 46b. An hour clutch slide piece 46c and an over-rotation clutch rotary piece 46d. One end of the over-rotation damper case 44a is always coupled to the damper case 43a so as not to be relatively rotatable, and the other end of the over-rotation damper case 44a is inserted into one end of the over-rotation clutch case 46a so as not to be relatively rotatable. The Further, the other end of the clutch case 46a at the time of over-rotation is coupled to the operation clutch case 22b through the coupling member so as not to be relatively rotatable, and is configured to rotate integrally with the winding pipe 12. One end of the overspeed damper shaft 44b is always coupled to the other end of the damper shaft 43b so as to be relatively rotatable, and the other end of the overspeed damper shaft 44b is one end of the overspeed clutch guide shaft 46b. The other end of the clutch guide shaft 46b is coupled to one end of the operation clutch fixed shaft 22a so as not to be relatively rotatable.

  Further, the overspeed clutch guide shaft 46b is provided to extend into the overspeed clutch case 46a. A female screw 46e is formed on the inner peripheral surface of the clutch case 46a at the time of overspeed, and a male screw 46f is formed on the outer peripheral surface of the slide piece 46c for the clutch at the time of overspeed. The over-rotation clutch slide piece 46c is fitted so as not to rotate with respect to the over-rotation clutch guide shaft 46b but to be slidable in the axial direction. An over-rotation clutch rotary piece 46d is fitted into one end of the over-rotation clutch guide shaft 46b so as to be relatively rotatable, and the over-rotation clutch rotary piece 46d is integrated with the over-rotation damper shaft 44b. Combined to rotate. The over-rotation clutch slide piece 46c and the over-rotation clutch rotary piece 46d are formed on opposite end surfaces with protrusions 46g and 46h that engage with each other when close to each other.

  The over-rotation damper case 44a is configured to rotate integrally with the take-up pipe 12 via the over-rotation clutch case 46a and the operation clutch case 22b. That is, the damper case 44a is configured to always rotate integrally with the winding pipe 12 while the screen 11 is moved up and down. When the projection 46g of the over-rotation clutch slide piece 46c and the projection 46h of the over-rotation clutch rotary piece 46d are separated, the over-rotation damper shaft portion 44b together with the over-rotation damper case 44a. Since it rotates and effective rotation resistance does not generate | occur | produce in the rotation resistance provision part for dampers at the time of overspeed, the braking device 21 at the time of overspeed is comprised so that a deceleration effect may not be exhibited. On the other hand, when the protrusion 46g of the clutch slide piece 46c for over-rotation and the protrusion 46h of the rotary piece 46d for over-rotation clutch are coupled, the rotation of the damper shaft 44b during over-rotation stops and the over-rotation occurs. Since effective rotational resistance is generated in the damper rotational resistance applying section, the over-rotation braking device 21 is configured to exhibit a deceleration action. Thus, the over-rotation braking device 21 suppresses further increase in the rotation speed of the winding pipe 12 when the rotation speed of the winding pipe 12 increases to near the upper limit value when the screen 11 is wound. It has become.

  The operation of the roll screen 10 configured in this way will be described. When the screen 11 is replaced or washed, the spring force of the take-up spring 16 is held unreleasable by the spring force holding mechanism 36 in a state where the screen 11 is pulled out from the take-up pipe 12 or almost all. Specifically, the slide member 38 is slid, and the three slide protrusions 38b of the slide member 38 are pressed against the inclined surfaces 39a of the three movable pieces 39, respectively. At this time, the tip portions of the three movable pieces 39 are pushed into the three fixing recesses 27a against the elastic force of the compression coil spring 41, and the switching means 37 is switched to the free position (FIGS. 2 and 4) The take-up pipe 12 rotates freely independently of the take-up spring 16, and the spring force stored in the take-up spring 16 is held in an unreleasable position at an arbitrary drawing position of the screen 11. That is, the fixing of the rotating ring 28 to the fixing ring 27 of the initial winding adjusting device 18 is released, and the winding pipe 12 is moved to the slide member 38, the rotating ring 28, the initial winding adjusting case 29, the adjusting shaft 23, and the intermediate shaft 24. The output shaft 26, the fixed shaft 32, the take-up spring 16, the constant braking device 19, the over-rotation braking device 21 and the operation clutch 22 rotate freely. Even if the winding pipe 12 is rotated by a predetermined angle or more in this state, the spring force of the winding spring 16 is not released unintentionally. However, when the switching means 37 is switched to the free rotation position, the operation clutch 22 is not completely free, and the winding pipe 12 may be temporarily fixed by the operation clutch 22, By temporarily rotating the winding pipe 12 in the direction in which the screen 11 is pulled out, the temporary fixing of the winding pipe 12 is released.

  In this state, after the screen 11 is removed from the winding pipe 12 and replaced or washed, a new screen 11 or the washed screen 11 is attached to the winding pipe 12. Then, after the slide member 38 is slid in the opposite direction to disengage the slide protrusion 38b from the movable piece 39, the winding pipe 12 is rotated, so that the three rotation concave grooves 28a have three fixing grooves. Matching with the recesses 27a, the tip portions of the three movable pieces 39 project into the three rotation grooves 28a by the elastic force of the compression coil spring 41, so that the switching means 37 is switched to the spring rotation position (FIG. 1). And FIG. 3). That is, the rotary ring 28 of the initial winding adjusting device 18 is fixed to the fixing ring 27 and the fixing of the winding pipe 12 to the rotary ring 28 and the initial winding adjusting case 29 is released. One end is coupled to one side plate 13 through a fixed ring 34, a fixed shaft 32, an output shaft 26, an initial winding adjustment case 29, a rotating ring 28 and a fixed ring 27, and the other end of the winding spring 16 is a moving wheel 33. Is coupled to the take-up pipe 12. Thereby, the spring force of the winding spring 16 acts between the winding pipe 12 and the one side plate 13. If the winding pipe 12 is slightly rotated in the direction in which the screen 11 is pulled out in this state, the operation clutch 22 allows the winding pipe 12 to rotate in the winding direction by the spring force of the winding spring 16. The spring force stored in the take-up spring 16 is transmitted to the take-up pipe 12, and the screen 11 is taken up by the take-up pipe 12. As a result, it is possible to carry out the operation of attaching and detaching the screen 11 to and from the take-up pipe 12 with care, and this operation can be easily performed in a very short time. In the above operation, when the screen 11 is pulled out from the winding pipe 12, it is necessary to pull out the screen 11 against the spring force of the winding spring 16, but one end of the replaced or washed screen 11 is connected to the winding pipe 12. After the slide member 38 of the switching means 37 is detached from the movable piece 39 and the switching means 37 is switched to the spring rotation position, the screen 11 is wound around the winding pipe 12 by the spring force of the winding spring 16. Since it can be taken, the work of winding the screen around the 11 winding pipe 12 becomes easy.

  On the other hand, when the screen 11 is not pulled out or slightly pulled out from the winding pipe 12, the spring force of the winding spring 16 is held unreleasable by the spring force holding mechanism 36, that is, the slide member 38 is slid. When the three slide protrusions 38b of the slide member 38 are pressed against the inclined surfaces 39a of the three movable pieces 39, the switching means 37 is switched to the free position, and the winding pipe 12 is independent of the winding spring 16. And rotate freely. As a result, the screen 11 can be pulled out from the take-up pipe 12 without applying the spring force of the take-up spring 16 to the take-up pipe 12, so that the operation of pulling out the screen 11 from the take-up pipe 12 becomes easy. .

10 Roll screen 11 Screen 12 Winding pipe 13 One side plate (supporting member)
14 The other side plate (supporting member)
16 Winding spring 36 Spring force holding mechanism 37 Switching means 38 Slide member 39 Movable piece

Claims (3)

A winding pipe (12) for winding the screen (11) so that it can be pulled out is rotatably supported by a pair of support members (13, 14), and a winding spring (16) is built in the winding pipe (12). In the roll screen configured to store in the winding spring (16) a spring force for rotating the screen (11) in the winding direction of the winding pipe (12),
One end of the winding spring (16) is attached to one support member (13) via a spring force holding mechanism (36), and the other end of the winding spring (16) is connected to the winding pipe (12). Concatenated,
The roll screen, wherein the spring force holding mechanism (36) is configured to hold the spring force stored in the winding spring (16) in an unreleasable state at an arbitrary drawing position of the screen (11). .   The spring force holding mechanism (36) includes a spring rotation position where the winding pipe (12) rotates together with the winding spring (16), and the winding pipe (12) includes the winding spring (16). The roll screen according to claim 1, further comprising switching means (37) for switching to any one of a free rotation position that independently rotates freely.   The switching means (37) includes a slide member (38) slidably attached to the winding pipe (12) in the axial direction and non-rotatable in the circumferential direction, and the one support member (13). The roll screen according to claim 2, further comprising a movable piece (39) which is provided on the movable member and is switched between the spring rotation position and the free rotation position when the slide member (38) is engaged and disengaged.

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