JP2018035565A - Rolling screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling screen capable of preventing a weight member from moving up and down while making the weight member large-sized in adjusting a daylighting quantity by relative movements of front and rear double screens and further in switching of an elevating operation.SOLUTION: A rolling screen according to the present invention is configured to suspend front and rear double screens 5a, 5b, and comprises two take-up shafts 4a, 4b, and an operation device 10 which allows the two take-up shafts 4a, 4b to rotate. The operation device 10 comprises a rotation transmission mechanism which is operable in lighting control according to how the front and rear double screens 5a, 5b overlap with each other such that a rotation quantity by which the first screen 5a is unwound by the take-up shaft 4a is substantially equal to a rotation quantity by which the second screen 5b is wound from the take-up shaft 4b, and a rotation quantity by which the first screen 5a wound by the take-up shaft 4a is substantially equal to a rotation quantity by which the second screen 5b is unwound from the take-up shaft 4b.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a roll screen that suspends and supports a plurality of screens in an overlapped state, and more particularly, to a roll screen that can adjust the amount of light collected in a room by adjusting the overlap of the screens.

  2. Description of the Related Art Conventionally, a roll screen has been proposed that can adjust the amount of light collected into the room by moving the double superimposed screens in the vertical direction (see, for example, Patent Document 1).

  In such a roll screen, a translucent part that partially transmits light and a light-shielding part that blocks light are alternately formed in stripes on the screen, and the screen is suspended in a doubled state. Has been. Then, by operating the operating means, the front and rear screens are relatively moved in the vertical direction, and the amount of light collected can be adjusted by adjusting the degree of overlap between the light transmitting portion and the light shielding portion.

  In addition, a roll screen is disclosed in which two screens are overlapped and the upper end of each screen is wound on a separate winding shaft, or the screen can be moved up and down (for example, Patent Document 2). , 3). In the roll screens disclosed in Patent Documents 2 and 3, each winding shaft is always rotated in the same direction in synchronization with the operation of the operation string, and the two screens are moved up and down simultaneously. When adjusting the amount of light collected, if the operating string is operated in the reverse direction after the screen is lifted / lowered, only one winding shaft is rotated within a predetermined rotation angle, so that the translucent part and the light shielding part are in the vertical direction. By moving relative to each other, it is possible to adjust the amount of light collected by adjusting the overlapping width of the light shielding portion with respect to the light transmitting portion. In the roll screen disclosed in Patent Document 3, the relative movement range of the screen can be adjusted from the outside.

  On the other hand, a roll screen is disclosed in which two screens are overlapped and the upper end of each screen is wound up by a double structure winding shaft, or the screen can be moved up and down (for example, patent document). 4). In the technique of Patent Document 4, two weight bars are individually attached to the lower end portions of the respective screens, a single cover for accommodating the two weight bars is provided, and the cover is attached to the two weight bars. When adjusting the overlapping width of the light-shielding portion with respect to the light-transmitting portion by making the relative movement possible by its own weight, the two weight bars are configured to move relative to each other inside the cover.

Japanese Patent No. 3349812 Japanese Patent No. 4955102 Japanese Patent No. 5539836 Japanese Patent No. 4800876

  In the techniques disclosed in Patent Documents 1, 2, and 3, when adjusting the amount of light collected by adjusting the overlapping width of the light shielding portion with respect to the light transmitting portion, the height of the weight bar provided at the lower limit of the screen moves up and down. There is a problem that it ends up. When such a vertical movement of the weight bar occurs, problems such as light leakage from the lower end of the weight bar and loss of airtightness occur.

  Further, the technique disclosed in Patent Document 4 has a problem in that a single cover that accommodates two weight bars is enlarged in the height direction by an amount necessary for adjusting the amount of light collection, thereby impairing the design. .

  For this reason, when adjusting the amount of light extraction by relative movement of the double front and rear screens, and further switching the lifting operation, the weight bar (weight bar and bottom cover) is prevented from being enlarged while preventing the weight bar from moving up and down. In particular, there is a demand for a technique that prevents light leakage from below in a manner in which the amount of collected light can be adjusted by a weight member in the lower limit position, and that increases airtightness in a manner in which the amount of ventilation can be adjusted.

  In view of the above-described problems, the object of the present invention is to move the weight member up and down while suppressing the enlargement of the weight member when adjusting the amount of light collected by the relative movement of the double front and rear screens and when switching the lifting operation. An object of the present invention is to provide a roll screen that can prevent this.

  The roll screen of the present invention is a roll screen that suspends front and rear double screens, and includes two winding shafts, and an operation device that can operate rotation of the two winding shafts, The operation device is configured to rotate the first screen from one winding shaft when performing dimming operation by overlapping the first screen and the second screen constituting the front and rear double screen. On the other hand, the rotation amount for rewinding the second screen by the other winding shaft can be operated almost equally, and the rotation amount for rewinding the first screen from the one winding shaft, A rotation transmission mechanism capable of operating the rotation amount of winding the second screen by the other winding shaft substantially equal to each other is provided.

  In the roll screen according to the present invention, the rotation transmission mechanism may be configured to take up the first screen from the one take-up shaft when the first screen and the second screen are moved up and down. When the second screen is wound from the other winding shaft and the first screen is rewound from the one winding shaft, the second screen is rewound from the other winding shaft. It is characterized by.

  Further, in the roll screen according to the present invention, the rotation transmission mechanism may be configured such that when the transition from the dimming operation to the ascending operation is continuously performed or when the dimming operation is continuously performed to the descending operation, The relative relationship between the rotation direction of the shaft and the rotation direction of the other winding shaft is continuously switched so as to be a relative relationship in the opposite rotation direction.

  Further, in the roll screen of the present invention, the rotation transmission mechanism is configured to have a gear structure of a rotation transmission path for dimming operation when transmitting the rotation of the one winding shaft to the rotation of the other winding shaft. And a gear configuration of a rotation transmission path for lifting operation.

  Further, in the roll screen of the present invention, the gear structure of the rotation transmission path for the lifting operation is a first transmission path, a driving gear for rotating the one winding shaft, and the other winding shaft. And a first transmission gear unit that transmits the rotation of the driving gear directly or indirectly to the driven gear with a play angle, and a rotation transmission path for the dimming operation. The gear configuration transmits the rotation of the driving gear directly or indirectly as a second transmission path to the driven gear with a switching angle, and according to the presence or absence of rotation transmission by the first transmission path. It includes a second transmission gear unit that switches rotation transmission by the second second transmission path.

  Further, in the roll screen of the present invention, the second transmission gear unit is rotated from the driving gear by the second transmission path while being rotated and transmitted from the driving gear to the driven gear by the first transmission path. The rotation transmission to the driven gear is interrupted, and the rotation transmission from the drive gear to the driven gear by the second transmission path is performed while the rotation transmission is not transmitted from the drive gear to the driven gear by the first transmission path. It has a cam clutch mechanism.

  In the roll screen according to the aspect of the invention, the first transmission path and the second transmission path may be separated in a front-rear direction that is substantially perpendicular to an axial direction of the two winding shafts in the operation device. Or the first transmission path and the second transmission path are separated from each other in the left-right direction that is substantially parallel to the axial direction of the two winding shafts in the operating device. Is configured as an integral switching mechanism.

  According to the present invention, when the front and rear double screens are moved relative to each other, particularly when the light intensity is adjusted by the relative movement of the front and rear double screens and when the lifting operation is switched, the weight member is prevented from being enlarged. However, the vertical movement of the weight member can be prevented.

It is a front view which shows schematic structure of the roll screen of 1st Embodiment by this invention. It is a section side view showing a schematic structure of a roll screen of a 1st embodiment by the present invention. It is a cross-sectional side view which shows schematic structure of the operating device of one Example in the roll screen of 1st Embodiment by this invention. (A), (b), (c) is a perspective view which shows roughly the gear structure of the 1st transmission path in the operating device of one Example which concerns on this invention, respectively. (A), (b) is a side view for demonstrating the amount of idle rotation of the transmission gear unit with a play in the 1st transmission path in the operating device of one Example which concerns on this invention, respectively. (A), (b), (c), (d) is a perspective view which shows roughly the gear structure of the 2nd transmission path in the operating device of one Example which concerns on this invention, respectively. (A) is a disassembled perspective view which shows schematic structure of the transmission gear unit with a cam clutch in the 2nd transmission path in the operating device of one Example which concerns on this invention, (b) is the transmission gear unit with the said cam clutch. It is a figure which shows the expansion | deployment state for one round of the outer surface about the switching drum which comprises a part of. (A) is a side view which shows the operation example at the time of the light control operation in the operating device of one Example which concerns on this invention, (b) is schematic operation | movement at the time of the light control operation in the said transmission gear unit with a cam clutch. It is front sectional drawing which shows the enlarged sectional view. (A) is a side view which shows the operation example at the time of raise operation in the operating device of one Example which concerns on this invention, (b) is the outline operation | movement at the time of raise operation in the said transmission gear unit with a cam clutch, and its It is front sectional drawing which shows an expanded sectional view. (A), (b), (c) is a cross-sectional side view schematically showing operations at the time of stopping, dimming operation, and raising operation of the roll screen of the first embodiment according to the present invention, respectively. (A), (b) is a cross-sectional side view which shows the schematic structure of the roll screen of 2nd Embodiment by this invention, and the schematic structure of an operating device, respectively. (A) thru | or (c) is a front view which shows schematic structure of the screen with the material | dough of the modification applicable to the roll screen of each embodiment by this invention, respectively.

  Hereinafter, roll screens according to embodiments of the present invention will be described with reference to the drawings. In addition, in the present specification, with respect to the front view of the roll screen shown in FIG. 1, the upper and lower directions in the drawing are respectively the upper direction (or upper side) and the lower direction (or lower side) according to the hanging direction of the screen. The left direction in the figure is defined as the left side of the roll screen, and the right direction in the figure is defined as the right side of the roll screen. Moreover, in the example demonstrated below, let the side to visually recognize be a front side (or indoor side) with respect to the front view of the roll screen shown in FIG. 1, and let the opposite side be a rear side (or outdoor side).

[First Embodiment]
(Roll screen configuration)
First, the roll screen of 1st Embodiment by this invention is demonstrated according to drawing. The roll screen of the first embodiment shown in FIG. 1 and FIG. 2 has support brackets 3 attached to both ends of a frame 2 that is attached to an attachment surface such as a window frame via the attachment bracket 1. Two winding shafts 4a and 4b are rotatably supported.

  The winding shafts 4a and 4b are supported by the support bracket 3 at a predetermined interval in the vertical direction, and are supported in a state slightly offset in the front-rear direction.

  The upper end of the outdoor first screen 5a is attached to the winding shaft 4a, and the upper end of the indoor second screen 5b is attached to the winding shaft 4b. The first and second screens 5a and 5b are suspended so as to be overlapped with each other in close proximity to the winding shafts 4a and 4b.

  In this example, as shown in FIG. 2, in particular, the take-up shafts 4a and 4b are configured to support the first and second screens 5a and 5b from the outdoor side, respectively.

  In the winding shafts 4a and 4b, a predetermined braking force is applied to the rotational torque of the spring motor 41 and the winding shafts 4a and 4b, respectively, for reducing the operating force when the first and second screens 5a and 5b are wound. A brake unit 42 to be applied is accommodated.

  The lower ends of the first and second screens 5a and 5b are attached to a weight bar 6 (see FIG. 2), and both ends of the weight bar 6 are rotatably supported by a bottom cover 7 that opens upward. Yes. The first and second screens 5a and 5b are guided upward from the bottom cover 7 through the opening. Such weight bar 6 and bottom cover 7 are configured as weight members.

  In the first and second screens 5a and 5b, a light transmitting portion 8 that transmits light and a light shielding portion 9 that blocks light are formed in stripes in the vertical direction at equal intervals. In the state where the light transmitting portions 8 of the first and second screens 5a and 5b overlap, external light can be taken from the light transmitting portions 8, and the light transmitting portions 8 of the first and second screens 5a and 5b In a state where the light shielding portions 9 overlap, external light can be blocked.

  The light transmitting portion 8 provided on the first and second screens 5a and 5b can be configured to have high air permeability, and the light shielding portion 9 can be configured to have low air permeability. Therefore, the air permeability can be adjusted by adjusting the overlapping width of the light shielding part 9 with respect to the light transmitting part 8.

  An operating device 10 is attached to the right support bracket 3 shown in FIG. 1, and an endless ball chain 11 is suspended from the operating device 10. Then, by operating the ball chain 11, the winding shafts 4a and 4b are rotated in the same direction at the same speed, and the first and second screens 5a and 5b can be moved up and down collectively.

  Further, when the ball chain 11 is pulled in the reverse direction after the first and second screens 5a and 5b are moved up and down, only the lower winding shaft 4b is rotated only by a predetermined angle, and the first and second screens 5a. , 5b can be relatively moved in the vertical direction.

  The ball chain 11 is connected to the connector 12 to be endless, and restriction members 13a and 13b are attached to restrict the ascending / descending ranges of the first and second screens 5a and 5b.

  When the first and second screens 5a and 5b are pulled up to the upper limit, the regulating member 13a comes into contact with the back side of the case 14 of the operating device 10, and further operation of the ball chain 11 in the same direction is possible. Be blocked. Further, when the first and second screens 5a and 5b are lowered to the lower limit, the regulating member 13b comes into contact with the front side of the case 14 and further operation of the ball chain 11 in the same direction is prevented.

  The connector 12 includes a ball locking portion that locks the ball of the ball chain 11 and a connecting portion that connects the ball locking portion. When the connector 12 is pulled with a force greater than a preset tensile force, A stop part comes off from a connection part.

(Operating device)
Next, a specific configuration of the operating device 10 will be described. As shown in FIG. 1, a pulley 15 is rotatably supported in a case 14 of the operating device 10, and a ball chain 11 is hooked on the pulley 15. Then, the pulley 15 is rotated in the forward and reverse directions by the operation of the ball chain 11.

  The operation device 10 has a structure shown in FIG. 3, and has a function that enables the first and second screens 5 a and 5 b to be moved up and down and the light adjustment operation to adjust the overlapping state of the light transmitting portion 8 and the light shielding portion 9. have.

  More specifically, as shown in FIG. 3, the operating device 10 includes a drive gear 16, a transmission gear unit 17 with play, a transmission gear 21, a transmission gear unit 22 with a cam clutch, and a driven gear 31.

  The drive gear 16 is rotatably supported by the case 14 below the case 14 of the operating device 10, and the driven gear 31 is rotatably supported by the case 14 above the case 14.

  The central axis of the drive gear 16 is coaxial with the central axis of the take-up shaft 4b, and the drive gear 16 is located on the right end side of the take-up shaft 4b and engages with the relative rotation incapable of relative rotation. Further, the center axis of the driven gear 31 is coaxial with the center axis of the winding shaft 4a, and the driven gear 31 is located on the right end side of the winding shaft 4a and is engaged so as not to be relatively rotatable.

  The drive gear 16 and the driven gear 31 have the same number of teeth. From the drive gear 16 rotated based on the operation of the ball chain 11, either the transmission gear unit 17 with play or the transmission gear unit 22 with cam clutch is connected. Rotational force is applied through.

  At this time, as will be described in detail later, the driven gear 31 is rotated in the same direction as the driving gear 16 at the same speed based on the rotation of the driving gear 16 during the raising / lowering operation. The driven gear 31 is rotated at the same speed in the opposite direction to the driving gear 16 based on the rotation of the driving gear 16. Then, the rotation of the driven gear 31 is continuously switched from the dimming operation to the ascending operation (or from the dimming operation to the descending operation) by the driving gear 16 rotated in one direction based on the operation of the ball chain 11. It has become.

  That is, in the case 14 of the operating device 10, the first transmission path TR1 that operates when the first and second screens 5a and 5b are moved up and down and the light control operation that operates when the first and second screens 5a and 5b are dimmed. A second transmission path TR2 is provided. That is, the first transmission path TR1 transmits the rotation from the driving gear 16 to the driven gear 31 via the transmission gear unit 17 with play during the lifting operation. On the other hand, the second transmission path TR2 transmits rotation from the drive gear 16 to the driven gear 31 via the transmission gear 21 and the transmission gear unit 22 with a cam clutch during the dimming operation.

(First transmission path)
As shown in FIGS. 4A, 4B, and 4C, the first transmission path TR1 is configured by meshing the drive gear 16, the transmission gear unit 17 with play, and the driven gear 31, respectively.

  As shown in FIG. 4A, the driven gear 31 has a central shaft hole 311 that is rotatably supported by a cylindrical shaft extending from the case 14. Further, as shown in FIG. 4C, the drive gear 16 is integrally formed with a pulley 15 on which the ball chain 11 can be hooked, and its central shaft hole 161 can be rotated by a cylindrical shaft extending from the case 14. It is supported.

  And the transmission gear unit 17 with a play for comprising 1st transmission path | route TR1 is comprised from the transmission gear 18, the intermediate | middle collar 19, and the transmission gear 20, as shown in FIG.4 (b). In this example, the two transmission gears 18 and 20 have the same number of teeth.

  The transmission gear 18 is configured to mesh with the drive gear 16, and a central shaft hole 181 is rotatably supported by a cylindrical shaft extending from the case 14. Further, a cylindrical portion 185 protrudes on the right side of the transmission gear 18 in the figure, and a transmission piece 183 that protrudes in a fan shape in the radial direction on the rotation guide recess 182 constituting the inner peripheral surface of the cylindrical portion 185. Is formed.

  The intermediate collar 19 is a member that is coupled to transmit the rotation of the transmission gear 18 to the transmission gear 20 with a play angle θ, and has a two-stage cylindrical outer shape of a large diameter portion 193 and a small diameter portion 194. The central shaft hole 191 is rotatably supported coaxially with the transmission gear 18 by the cylindrical shaft extending from the case 14. In addition, a transmission piece 192 that protrudes in a fan shape in the axial direction is formed on the left side of the large diameter portion 193 in the figure. A transmission piece 195 protruding in a fan shape in the axial direction is formed on the right side of the small diameter portion 194 in the figure.

  The large-diameter portion 193 of the intermediate collar 19 is rotatably supported by the rotation guide recess 182 of the transmission gear 18, and the transmission piece 192 of the intermediate collar 19 is on the same rotational locus with respect to the transmission piece 183 of the transmission gear 18. It is supposed to be located in. Accordingly, as shown in FIG. 5A, the rotation of the transmission piece 183 of the transmission gear 18 can be transmitted to the transmission piece 192 of the intermediate collar 19 with a free angle θ1.

  The transmission gear 20 is configured to mesh with the driven gear 31, and each of the left two-stage center shaft holes 201, 202 and the right center shaft hole 203 is formed continuously. The central shaft hole 201 rotatably supports the outer peripheral wall of the cylindrical portion 185 in the transmission gear 18, and the central shaft hole 202 supports the small diameter portion 194 of the intermediate collar 19 so as to be rotatable. The central shaft hole 203 is supported by the cylindrical shaft extending from the case 14 so as to be rotatable coaxially with the transmission gear 18 and the intermediate collar 19.

  Further, a transmission piece 204 is formed on the central shaft hole 202 of the transmission gear 20 so as to project in a fan shape in the radial direction at the boundary position with the central shaft hole 203, and this transmission piece 204 is a transmission piece of the intermediate collar 19. 195 is located on the same rotation trajectory. Therefore, as shown in FIG. 5B, the transmission piece 195 of the intermediate collar 19 can transmit the rotation with a play angle θ <b> 2 to the transmission piece 204 of the transmission gear 20.

  That is, the transmission gear unit with play 17 is transmitted to the transmission gear 20 with a play angle θ that is substantially defined by the sum of the play angles θ1 and θ2 with respect to the rotation of the transmission gear 18, and θ> 360 degrees. It is configurable. The play angle θ is an angle determined by the vertical width of the translucent portion 8, the diameters of the winding shafts 4a and 4b, and the number of teeth of each gear, and the translucent portions in the first and second screens 5a and 5b. 8 depends on the adjustment range relating to the degree of overlap between 8 and the light shielding portion 9. Therefore, if the required play angle θ <360 degrees, the intermediate collar 19 can be integrated with the transmission gear 18 or the transmission gear 20.

  The first transmission path TR1 formed in this way has the same speed in the same direction to the driven gear 31 through the transmission gear unit 17 with play when the first and second screens 5a and 5b are moved up and down. In the dimming operation, the rotation of the drive gear 16 is not transmitted to the driven gear 31 via the transmission gear unit 17 with play due to the play angle θ (that is, the idling angle). It has become.

  Therefore, when the first and second screens 5 a and 5 b are moved up and down, the winding shaft 4 b is rotated based on the rotation of the drive gear 16, and the idle transmission gear unit 17 is operated based on the rotation of the drive gear 16. When the driven gear 31 rotates with an angle θ (that is, idling angle), the winding shaft 4a rotates in the same direction at the same speed.

  That is, from the viewpoint of the first transmission path TR1, when the drive gear 16 that rotates the winding shaft 4b rotates in the direction of arrow A as shown in FIG. 2, the transmission gear unit 17 with play shown in FIG. In the angle range (play angle θ) until the transmission piece 183 contacts the transmission piece 192 and further the transmission piece 195 contacts the transmission piece 204, the rotation of the drive gear 16 is not transmitted to the driven gear 31. However, when the play angle θ passes, the rotation of the drive gear 16 is transmitted to the driven gear 31 and the winding shaft 4a is transmitted to rotate in the direction of arrow A.

  Similarly, from the viewpoint of the first transmission path TR1, when the drive gear 16 that rotates the winding shaft 4b rotates in the direction of arrow B as shown in FIG. 2, the transmission gear unit with play shown in FIG. 17, the rotation of the drive gear 16 is transmitted to the driven gear 31 in the angle range (play angle θ) until the transmission piece 183 contacts the transmission piece 192 and further the transmission piece 195 contacts the transmission piece 204. However, when the play angle θ passes, the rotation of the drive gear 16 is transmitted to the driven gear 31 and the winding shaft 4a is transmitted to rotate in the direction of arrow B.

(Second transmission path)
As shown in FIGS. 6A, 6 </ b> B, 6 </ b> C, and 6 </ b> D, the second transmission path TR <b> 2 includes a driving gear 16, a transmission gear 21, a transmission gear unit 22 with a cam clutch, and a driven gear 31. Are configured to mesh with each other.

  The driven gear 31 shown in FIG. 6A and the drive gear 16 shown in FIG. 6D are as described with reference to FIGS. 4A and 4D, respectively.

  As shown in FIG. 6C, the transmission gear 21 is configured as a flat gear, and its central shaft hole 211 is rotatably supported by a cylindrical shaft extending from the case 14 and meshes with the drive gear 16. Yes.

  The transmission gear unit 22 with a cam clutch for constituting the second transmission path TR2 is, as shown in FIG. 6B, a cam clutch mechanism having a brake spring 27 and the like between a pair of transmission gears 23 and 28. Has a structure provided. The end portions 27a, 27b of the brake spring 27 are locked by locking portions 141, 142 provided on the case 14 shown in FIG.

  With reference to FIG. 7, the structure of the transmission gear unit 22 with a cam clutch is demonstrated. As shown in FIG. 7A, the transmission gear unit 22 with a cam clutch includes a transmission gear 23, a switching drum 24, a switching ball 25, a switching case 26, a brake spring 27, and a transmission gear 28. In this example, the number of teeth of the two transmission gears 23 and 28 is the same, and the number of teeth of the transmission gear 21 shown in FIG. 6C and the transmission gears 18 and 20 shown in FIG. Is the same number.

  The transmission gear 23 is configured to mesh with the transmission gear 21 shown in FIG. 6C, and its central shaft hole 231 is rotatably supported by a cylindrical shaft extending from the case 14. A switching gear 232 protrudes from the right side of the transmission gear 23 in the figure, and a circular recess 233 is formed at the tip of the switching gear 232.

  The switching drum 24 has a substantially cylindrical outer shape, and a switching groove portion 242 having a depth substantially equal to the hemisphere of the switching ball 25 is formed in the groove shape shown in FIG. The switching ball 25 can be relatively moved by 242. Further, the cylindrical drum extending from the case 14 for supporting the transmission gear 23 is inserted into the switching drum 24 and can be relatively moved in the axial direction while always meshing with the switching gear 232 of the transmission gear 23 (sliding). A gear groove 241 is formed. However, although the gear groove 241 will be described later with reference to FIG. 8 and FIG. On the right side, a shaft hole 243 having a larger diameter is formed.

  The switching case 26 has a substantially cylindrical outer shape, and is attached to the outer peripheral surface 263 so that the brake spring 27 is tightened. The end portions 27a and 27b of the brake spring 27 are locked by locking portions 141 and 142 provided on the case 14 shown in FIG. For this reason, the switching case 26 can rotate relative to the case 14, but a predetermined braking force is applied by the brake spring 27, so that the rotational force exceeding the predetermined braking force by the brake spring 27 is applied to the switching case 26. Unless this occurs, relative rotation of the switching case 26 with respect to the case 14 is prevented.

  The switching case 26 is formed with a shaft hole 261 that supports the outer peripheral surface of the switching drum 24 so as to be slidable in the axial direction. Further, a locking hole 262 having a depth approximately equal to the hemisphere of the switching ball 25 is formed on the shaft hole 261, and the switching ball 25 can be locked by the locking hole 262.

  The transmission gear 28 is configured to mesh with the driven gear 31 shown in FIG. 6A, and a central shaft hole 281 thereof is rotatably supported coaxially with the transmission gear 23 by the cylindrical shaft extending from the case 14. Further, a switching gear 282 protrudes from the left side of the transmission gear 28 in the figure, and a circular convex portion 283 is formed at the tip of the switching gear 282. The circular convex portion 283 of the transmission gear 28 is engaged with and supported by the circular concave portion 233 of the transmission gear 23 so as to be relatively rotatable. The transmission gears 23 and 28 have the same shape except that a circular concave portion 233 and a circular convex portion 283 are formed. However, since both the transmission gears 23 and 28 are supported by the cylindrical shaft extending from the case 14, it is possible to make the transmission gears 23 and 28 completely the same without forming the circular concave portion 233 and the circular convex portion 283.

  Then, the surface constituting the tooth portion of the transmission gear 23 is located at a position that substantially contacts one side surface (the left side in the drawing) of the switching case 26 and a position that substantially contacts the other side surface (the right side in the drawing) of the switching case 26. Are combined so that the surfaces constituting the teeth of the transmission gear 28 are positioned (see FIG. 8B or FIG. 9B described later).

  Here, FIG. 7B shows a developed state for one round of the outer surface of the switching drum 24. A switching groove portion 242 is formed on the outer surface of the switching drum 24. The switching groove portion 242 is roughly divided into a dimming region S2 constituting a switching angle θ ′, an ascending region S1 and a descending region through a state transition region. S3 is formed continuously in the form of].

  The switching angle θ ′ depends on the outer diameter of the switching drum 24, but the time required for the amount of rotation of the play angle θ in the first transmission path TR1 and the time required for the amount of rotation of the switching angle θ ′ are as follows. Set to match. Therefore, the switching angle θ ′ also depends on the adjustment range relating to the overlapping state of the light transmitting portion 8 and the light shielding portion 9 in the first and second screens 5a and 5b.

  That is, when the switching ball 25 is on the dimming region S2 constituting the switching angle θ ′, the switching case 26 is not rotated by the braking force of the brake spring 27, and the switching drum 24 is transmitted within the switching case 26. It slides to the 28th side. Then, the gear groove 241 of the switching drum 24 meshes with the switching gear 282 of the transmission gear 28, and the rotation of the transmission gear 23 is transmitted to the transmission gear 28. In the first transmission path TR <b> 1 during this time, the rotation of the drive gear 16 is not transmitted to the driven gear 31 by the action of the transmission gear unit 17 with play. Thereby, the rotation of the drive gear 16 shown in FIG. 6 (d) is transmitted to the driven gear 31 shown in FIG. 6 (a) in the reverse direction at the same speed, and the winding shafts 4a and 4b are moved in the reverse direction. The first screen 5a is rewound in accordance with the winding amount of the second screen 5b, and the light control operation of the first and second screens 5a and 5b becomes possible. Since the first screen 5a is rewound according to the winding amount of the second screen 5b, the weight bar 6 and the bottom cover 7 do not move up and down. In addition, when the switching ball 25 is on the light control region S2 constituting the switching angle θ ′, when the second screen 5b is rewound, the first screen 5a is also selected according to the amount of rewound of the second screen 5b. Is wound up, the weight bar 6 and the bottom cover 7 do not move up and down.

  On the other hand, when the switching ball 25 is on the ascending region S1 (or the descending region S3), the switching drum 24 slides toward the transmission gear 23 in the switching case 26, and the switching case 26 is subjected to the braking force by the brake spring 27. Rotate against it. Then, the gear groove 241 of the switching drum 24 does not mesh with the switching gear 282 of the transmission gear 28, and the rotation of the transmission gear 23 is not transmitted to the transmission gear 28. Thereby, the rotation of the drive gear 16 shown in FIG. 6 (d) is not transmitted to the driven gear 31. In the first transmission path TR1 during this period, the action of the transmission gear unit 17 with play causes the drive gear 16 to rotate. The rotation is transmitted to the driven gear 31 in the same direction and at the same speed, and the first and second screens 5a and 5b can be moved up and down.

  More specifically, the operations during the dimming operation and the ascending / descending operation in the transmission gear unit 22 with the cam clutch for configuring the second transmission path TR2 will be described with reference to FIGS. 8 and 9, respectively.

[Dimmer operation]
FIG. 8A is a side view showing an operation example during the light control operation in the operation device 10 of the embodiment according to the present invention, and FIG. 8B is a light control in the transmission gear unit 22 with a cam clutch. It is front sectional drawing which shows schematic operation | movement at the time of operation, and its expanded sectional view.

  As shown in FIG. 8 (a), in the case 14 of the operating device 10, the first transmission path TR1 that operates when the first and second screens 5a and 5b are moved up and down, the first and second screens 5a, A second transmission path TR2 that is activated during the dimming operation 5b is provided.

  During the dimming operation of the first and second screens 5a and 5b, the rotation of the drive gear 16 is not transmitted to the driven gear 31 by the action of the transmission gear unit 17 with play in the first transmission path TR1. ing.

  On the other hand, in the second transmission path TR2, the rotation of the driving gear 16 is transmitted to the driven gear 31 by the action of the transmission gear unit 22 with the cam clutch (indicated by the arrowheads in white in FIG. 8A). Rotation transmission).

  The operation of the transmission gear unit 22 with the cam clutch at this time is shown in FIG. The switching ball 25 is on the dimming region S2 constituting the switching angle θ ′, and the end portions 27a and 27b of the brake spring 27 are locked by locking portions 141 and 142 provided on the case 14, respectively. Therefore, the switching case 26 is not rotated by the braking force by the brake spring 27. When the switching ball 25 is on the dimming region S <b> 2 constituting the switching angle θ ′, the switching drum 24 slides toward the transmission gear 28 in the switching case 26.

  In the switching drum 24, the gear groove 241 is formed at a position about the center position in the axial direction from the left surface of the switching drum 24 as shown in the enlarged sectional view in FIG. A shaft hole 243 having a larger diameter is formed on the right side of the groove 241 in the drawing.

  In the state shown in FIG. 8B, the gear groove 241 of the switching drum 24 meshes with the switching gear 282 of the transmission gear 28, and the rotation of the transmission gear 23 is transmitted to the transmission gear 28. As a result, the rotation of the drive gear 16 is transmitted to the driven gear 31 in the reverse direction at the same speed, and the winding shafts 4a and 4b are rotated in the reverse direction at the same speed. The first screen 5a is rewound according to the amount to be taken, and the dimming operation of the first and second screens 5a and 5b becomes possible. Since the first screen 5a is rewound according to the winding amount of the second screen 5b, the weight bar 6 and the bottom cover 7 do not move up and down.

[Elevation operation (when ascending operation)]
FIG. 9A is a side view showing an example of operation during the raising operation in the operating device 10 of one embodiment according to the present invention, and FIG. 9B is a diagram showing the operation during the raising operation in the transmission gear unit 22 with the cam clutch. It is front sectional drawing which shows schematic operation | movement and its expanded sectional view.

  As shown in FIG. 9A, in the case 14 of the operating device 10, a first transmission path TR1 that operates when the first and second screens 5a and 5b are raised and lowered, and the first and second screens 5a and 5a, A second transmission path TR2 that is activated during the dimming operation 5b is provided.

  When the first and second screens 5a and 5b are moved up and down (ascending), the drive gear 16 rotates to the driven gear 31 in the first transmission path TR1 due to the action of the transmission gear unit 17 with play. Is transmitted (rotational transmission indicated by an arrowhead in FIG. 9A).

  On the other hand, in the second transmission path TR2, the rotation of the drive gear 16 is not transmitted to the driven gear 31 by the action of the transmission gear unit 22 with the cam clutch.

  The operation of the transmission gear unit 22 with a cam clutch at this time is shown in FIG. When the switching ball 25 is on the ascending region S1, the switching drum 24 slides toward the transmission gear 23 in the switching case 26, and the switching case 26 rotates against the braking force by the brake spring 27.

  In the switching drum 24, the gear groove 241 is formed at a position about the center position in the axial direction from the left surface of the switching drum 24 as shown in an enlarged sectional view in FIG. A shaft hole 243 having a larger diameter is formed on the right side of the groove 241 in the drawing.

  In the state shown in FIG. 9B, the gear groove 241 of the switching drum 24 is not engaged with the switching gear 282 of the transmission gear 28, and the rotation of the transmission gear 23 is not transmitted to the transmission gear 28. Thereby, the rotation of the drive gear 16 is not transmitted to the driven gear 31.

  On the other hand, in the first transmission path TR1 during this period, the rotation of the drive gear 16 is transmitted to the driven gear 31 at the same speed in the same direction by the action of the transmission gear unit 17 with play. Ascending operation of 5a, 5b becomes possible.

  When the switching ball 25 is on the lowering region S3, the operation is almost the same, and the gear groove 241 of the switching drum 24 is not engaged with the switching gear 282 of the transmission gear 28, and the rotation of the transmission gear 23 is transmitted to the transmission gear 28. It is not communicated. As a result, the rotation of the drive gear 16 is not transmitted to the driven gear 31, and the rotation of the drive gear 16 is directed to the driven gear 31 in the first transmission path TR <b> 1 by the action of the transmission gear unit 17 with play. Since rotation is transmitted at the same speed, the first and second screens 5a and 5b can be lowered.

  With such an operation, when the first and second screens 5a and 5b are collectively moved up and down, the ball chain 11 is operated in the reverse direction, and the drive gear 16 is rotated in the reverse direction. Until the rotation is transmitted to the driven gear 31 by the action of the gear unit 17, the take-up shaft 4a is rotated in the opposite direction to the take-up shaft 4b by the action of the transmission gear unit 22 with the cam clutch, and the dimming operation is possible. It becomes. For this reason, the first screen 5a is rewound according to the winding amount of the second screen 5b by the dimming operation by rotating the winding shaft 4a in the direction opposite to the winding shaft 4b, or Since the first screen 5a is wound according to the amount of rewinding of the two screens 5b, the weight bar 6 and the bottom cover 7 do not move up and down.

  For example, as shown in FIG. 10A, at the bottom cover 7 at the height h, the light transmitting portion 8 and the light shielding portion 9 in the first and second screens 5a and 5b are overlapped in the front-rear direction. Suppose there is. In this state, when the dimming operation is performed as shown in FIG. 10B, the rotation transmission from the drive gear 16 to the driven gear 31 due to the action of the transmission gear unit 17 with play is not performed, and the transmission gear with the cam clutch is transmitted. Rotation is transmitted from the drive gear 16 to the driven gear 31 by the action of the unit 22, and a dimming operation in which the winding shaft 4 a is rotated in the direction opposite to the winding shaft 4 b becomes possible. Since the first screen 5a is rewound according to the winding amount of the second screen 5b by the light control operation by rotating the winding shaft 4a in the direction opposite to the winding shaft 4b, the bottom cover 7 It hardly moves up and down from the position of height h.

  When the operation of the ball chain 11 shifts from the dimming operation shown in FIG. 10 (b) to the ascending operation continuously, as shown in FIG. 10 (c), each of the first and second screens 5a and 5b The bottom cover 7 ascends from the position of the height h in a state where the light transmitting portions 8 (or the respective light shielding portions 9) substantially coincide with each other in the front-rear direction. The same operation is performed when the dimming operation is continuously shifted to the lowering operation. However, when the lowering operation is performed, for example, as shown in FIG. Further, the second screens 5a and 5b descend while maintaining the state in which the light transmitting portion 8 and the light shielding portion 9 overlap in the front-rear direction.

  The roll screen according to the present embodiment configured as described above can perform the operation of adjusting the light extraction amount without moving the weight bar 6 and the bottom cover 7 up and down.

  The dimming operation in the roll screen according to the present embodiment operates in the same way regardless of whether the weight bar 6 and the bottom cover 7 are at the lower limit position. A roll screen having a light control function or a ventilation adjustment function can be realized.

  In particular, when the bottom cover 7 is at the lower limit position, light leakage from below the bottom cover 7 can be prevented in a manner in which the amount of light extraction can be adjusted, or from the bottom of the bottom cover 7 in a manner in which the amount of ventilation can be adjusted. Can improve the airtightness.

  In addition, the weight bar 6 and the bottom cover 7 can be made smaller than the configuration in which the bottom cover 7 can be moved relative to the weight bar 6.

  In particular, in the present embodiment, the light quantity adjustment operation is performed without moving the weight bar 6 and the bottom cover 7 up and down with a configuration in which the front and rear double first and second screens 5a and 5b are brought closer to or in close contact with each other. Therefore, when the light transmitting portion 8 and the light shielding portion 9 in the first and second screens 5a and 5b are overlapped in the front-rear direction, the light shielding performance can be further improved.

[Second Embodiment]
Next, with reference to FIG. 11, the roll screen of 2nd Embodiment is demonstrated. In addition, the same reference number is attached | subjected to the component similar to the roll screen of 1st Embodiment mentioned above. When the light transmitting portion 8 and the light shielding portion 9 in the first and second screens 5a and 5b are overlapped in the front-rear direction, the front and back double first and second screens 5a, An air layer is positively provided between 5b so as to make the heat insulation work. However, it is desirable that both the light-transmitting portion 8 and the light-shielding portion 9 have low air permeability in order to exert a heat insulating function.

  That is, as shown in FIG. 11A, in this embodiment, the take-up shaft 4a supports the first screen 5a from the outdoor side, and the take-up shaft 4b supports the second screen 5b from the indoor side. The first and second screens 5a and 5b are respectively suspended in a substantially vertical direction.

  However, in this embodiment, the winding shafts 4a and 4b are configured to be rotatable in the reverse direction at the same speed during the lifting operation. Therefore, for example, as shown in FIG. 11 (b), the transmission gear unit 17 with play and the transmission with the cam clutch are compared with the operation device 10 having the structure shown in FIG. The arrangement of the gear units 22 is assumed to be interchanged.

  Therefore, at the time of the raising / lowering operation in the present embodiment, the winding shaft 4b is rotated based on the rotation of the driving gear 16, and based on the rotation of the driving gear 16, the transmission gear unit 17 with play by the first transmission path TR1 is used. When the driven gear 31 rotates, the winding shaft 4a rotates in the reverse direction at the same speed.

  On the other hand, during the dimming operation, the take-up shaft 4b is rotated based on the rotation of the drive gear 16, and is driven by the second transmission path TR2 via the transmission gear unit 22 with the cam clutch based on the rotation of the drive gear 16. When the gear 31 rotates, the winding shaft 4a rotates in the same direction at the same speed.

  In the second embodiment, the relative relationship with respect to the rotation direction of the winding shafts 4a and 4b is reversed as compared with the first embodiment, and the second screen 5b is wound by the dimming operation. The same is true in that the first screen 5a is rewound according to the amount, or the first screen 5a is wound according to the rewound amount of the second screen 5b. For this reason, also in the present embodiment, the dimming operation can be performed with almost no vertical movement of the weight bar 6 and the bottom cover 7.

  In the embodiment illustrated in FIG. 11, in order to improve the understanding of the basic structure, the first and second screens 5a and 5b are respectively suspended substantially vertically by the winding shafts 4a and 4b. An example is described.

  However, practically, a member having an opening is provided below the support bracket 3 so that the front and rear double first and second screens 5a and 5b are closer to each other below the winding shaft 4b. It is configured to guide the drooping of the front and rear double first and second screens 5a and 5b. Further, the bottom cover 7 is preferably constructed as shown in FIG. 2 so that the first and second screens 5a and 5b are guided upward.

  Therefore, when an air layer is positively provided between the front and rear double first and second screens 5a and 5b, the distance between the first and second screens 5a and 5b can be arbitrarily set.

  In the embodiment shown in FIG. 11, since an air layer is positively provided between the front and rear double first and second screens 5a and 5b, a heat insulating function is made to work rather than improving its light shielding performance. Others include the advantages exemplified in the first embodiment described above.

(Screen modification)
In the example of the above-described embodiment, the first and second screens 5a and 5b have the light transmitting portion 8 that transmits light and the light shielding portion 9 that blocks light, which are formed in stripes in the vertical direction at equal intervals. Although an example has been described, it need not be limited to this.

  For example, as a modification of the first and second screens 5a and 5b in the roll screen shown in FIG. 1, as illustrated in FIG. 12A, the first and second screens 5a and 5b are lower than the weight bar 6. A roll screen capable of adjusting the amount of light collected so that only a predetermined region at the upper and lower ends of the first and second screens 5a and 5b is a light transmitting portion 8 and the other region is a light shielding portion 9 when in position. can do.

  Moreover, as illustrated in FIG. 12B, the first and second screens 5 a and 5 b may be configured such that the light transmitting portion 8 and the light shielding portion 9 are checkered (or staggered).

  Further, as illustrated in FIG. 12C, the first and second screens 5 a and 5 b in which the light transmitting portion 8 and the light shielding portion 9 are striped obliquely in parallel can be formed.

  The present invention has been described above with reference to specific embodiments. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the technical concept thereof. For example, in the example of the embodiment described above, the operation using the ball chain for the rotation operation of the winding shafts 4a and 4b has been described as an example, but the rotation operation using a string-like operation cord may be used.

  In the example of each embodiment described above, the time required for the amount of rotation of the play angle θ in the first transmission path TR1 and the time required for the amount of rotation of the switching angle θ ′ are set to be substantially the same. , Strictness is not required. However, in order to make the switching transmission between the first transmission path TR1 and the second transmission path TR2 smoother, it is preferable that the rotation amount of the play angle θ ≧ the rotation amount of the switching angle θ ′.

  In the example of each embodiment described above, an example in which the first transmission path TR1 and the second transmission path TR2 are formed separately in the front-rear direction in the controller device 10 has been described. It is also possible to configure so as to be formed separately in the direction (the direction of the rotation axis of the winding shafts 4a and 4b).

  Furthermore, in the example of each embodiment described above, the transmission gear unit 17 with play for configuring the first transmission path TR1 and the transmission gear unit 22 with cam clutch for configuring the second transmission path TR2 are separated. Although described as a member, the first transmission path TR1 and the second transmission path TR2 can be configured as an integral switching mechanism. For example, it is realized by providing a mechanism for switching between the function of the transmission gear unit 17 with play and the function of the transmission gear unit 22 with cam clutch so as to form one transmission path.

  According to the present invention, it is possible to prevent the weight member from moving up and down while suppressing the enlargement of the weight member when adjusting the amount of light collected by the relative movement of the double front and rear screens, and further when switching the lifting operation. Useful for roll screen applications with dual screens.

DESCRIPTION OF SYMBOLS 1 Mounting bracket 2 Frame 3 Support bracket 4a, 4b Winding shaft 5a 1st screen 5b 2nd screen 6 Weight bar 7 Bottom cover 8 Translucent part 9 Light-shielding part 10 Operating device 11 Ball chain 14 Case of operating device 16 Drive gear 17 Transmission gear unit with play 21 Transmission gear 22 Transmission gear unit with cam clutch 31 Driven gear

Claims (7)

It is a roll screen that suspends front and rear double screens,
Two winding shafts,
An operation device that enables operation of rotation of the two winding shafts,
The operation device is configured to rotate the first screen from one winding shaft when performing dimming operation by overlapping the first screen and the second screen constituting the front and rear double screen. On the other hand, the rotation amount for rewinding the second screen by the other winding shaft can be operated almost equally, and the rotation amount for rewinding the first screen from the one winding shaft, A roll screen comprising a rotation transmission mechanism capable of operating a rotation amount of the second screen by the other winding shaft to be substantially equal.   When the first screen and the second screen are moved up and down, the rotation transmission mechanism moves the second screen from the other winding shaft when winding the first screen from the one winding shaft. 2, and when the first screen is rewound from the one winding shaft, the second screen is rewound from the other winding shaft. Roll screen as described.   When the rotation transmission mechanism continuously shifts from the dimming operation to the ascending operation, or when it continuously shifts from the dimming operation to the descending operation, the rotation direction of the one winding shaft and the other winding 3. The roll screen according to claim 1, wherein the roll screen is configured to be continuously switched so that the relative relationship in the rotation direction of the spindle is in the opposite rotation direction. 4.   When the rotation transmission mechanism transmits the rotation of the one winding shaft to the rotation of the other winding shaft, a gear configuration of a rotation transmission path for dimming operation and a rotation transmission path for lifting operation A roll screen according to any one of claims 1 to 3, characterized by comprising: The gear structure of the rotation transmission path for the lifting operation includes, as a first transmission path, a driving gear for rotating the one winding shaft, a driven gear for rotating the other winding shaft, and the A first transmission gear unit for transmitting rotation of the drive gear directly or indirectly to the driven gear with a play angle;
The gear structure of the rotation transmission path for the dimming operation transmits the rotation of the driving gear to the driven gear with a switching angle directly or indirectly as the second transmission path, and the first transmission path 5. The roll screen according to claim 4, further comprising a second transmission gear unit that switches the rotation transmission by the second second transmission path according to the presence or absence of the rotation transmission by.   While the second transmission gear unit transmits the rotation from the drive gear to the driven gear through the first transmission path, the second transmission gear unit cuts off the rotation transmission from the drive gear to the driven gear through the second transmission path. And a cam clutch mechanism that transmits rotation from the drive gear to the driven gear by the second transmission path while the rotation is not transmitted from the drive gear to the driven gear by the first transmission path. The roll screen according to claim 5.   The first transmission path and the second transmission path are configured to be separated in the front-rear direction which is substantially perpendicular to the axial direction of the two winding shafts in the operating device, or in the operating device In this configuration, the first transmission path and the second transmission path are configured as an integral switching mechanism that is separated in the left-right direction that is substantially parallel to the axial direction of the two winding shafts. The roll screen according to claim 5, wherein the roll screen is provided.