Sheet shutter drive device and shutter device

Abstract

To suppress staining of a sheet.SOLUTION: A sheet shutter drive device 30, which is configured to drive an openable / closable sheet 32 for closure of a building opening, includes a drive shaft 34 that rotates by receiving a driving force, a cylindrical drive drum 36 that is arranged coaxially with the drive shaft 34 and has an anodized outer peripheral surface, and a connecting member 38 that connects the drive shaft 34 and the drive drum 36.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to a sheet shutter drive device and a shutter device. [Background technology]

[0002] Patent Document 1 describes a sheet-type shutter curtain formed using a flexible sheet. The shutter curtain is wound on a winding drum which is assembled into a cylindrical shape using a first half, a second half, and a third half. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-44496 Summary of the Invention [Problem to be solved by the invention]

[0004] In a sheet shutter drive device, if the outer peripheral surface of the drive drum around which the sheet is wound is coated with various types of paint to ensure durability, the paint from this coating will adhere to the sheet and stain it.

[0005] The present disclosure aims to suppress staining of seats. [Means for solving the problem]

[0006] The sheet shutter drive device of the first embodiment is a sheet shutter drive device for driving a sheet that can be opened and closed to block an opening in a building, and has a drive shaft that rotates when it receives a driving force, a cylindrical drive drum that is arranged coaxially with the drive shaft and has an anodized outer surface, and a connecting member that connects the drive shaft and the drive drum.

[0007] In this sheet shutter drive device, the drive shaft and drive drum are connected by a connecting member. When the drive shaft receives a driving force and rotates, the drive drum also rotates. When a sheet is wrapped around the drive drum, the sheet is driven and moved by the drive drum.

[0008] The outer surface of the drive drum is anodized. This allows a coating to be formed on the outer surface of the drive drum without painting, achieving the desired durability. Because the outer surface of the drive drum is not painted, paint does not adhere to the seat, preventing seat contamination.

[0009] In the second aspect of the sheet shutter drive device, in the first aspect, the connecting member has a disk-shaped core that is coaxially attached to the drive shaft, a fastening member that fastens the drive drum and the core, and a connecting member that connects the drive shaft and the core.

[0010] The drive shaft and the drive drum can be connected via the core. The core is disk-shaped and is attached coaxially to the drive shaft, so the drive drum can be maintained coaxial with the drive shaft.

[0011] The drive drum and core are fastened together with a fastening member. The drive shaft and core are connected together with a connecting member. Compared to a configuration in which the drive drum and core are welded together, or a configuration in which the drive shaft and core are welded together, this configuration provides higher positional accuracy between the drive shaft and core, and between the core and drive drum. Because no welding is required, painting such as baking is not required, and paint does not adhere to the sheet.

[0012] In the sheet shutter drive device of the third aspect, in the first or second aspect, the fastening member includes a bolt that passes through the drive drum and is screwed into the outer surface of the core, and whose head does not protrude from the outer surface of the drive drum.

[0013] The bolt has a simple structure in which it passes through the drive drum and is screwed into the outer surface of the core, allowing the drive drum and core to be connected with high positional accuracy. The bolt head does not protrude from the outer surface of the drive drum, which reduces damage to the seat caused by the bolt head coming into contact with the seat.

[0014] In the sheet shutter driving device of the fourth aspect, in the third aspect, a drum recess for accommodating the head of the bolt is formed on the outer peripheral surface of the driving drum.

[0015] By accommodating the bolt head in the drum recess, a structure can be achieved in which the bolt head does not protrude from the outer circumferential surface of the drive drum. This eliminates the need to create a recess by countersinking or otherwise processing the outer circumferential surface of the drive drum, and makes it possible to stably obtain a shape that prevents the bolt head from protruding from the outer circumferential surface of the drive drum.

[0016] In the fifth aspect of the sheet shutter driving device, in the fourth aspect, a drum convex portion that protrudes radially inward at a position behind the drum concave portion is formed on the inner surface of the driving drum, and a core concave portion in which the drum convex portion is accommodated is formed on the outer surface of the core.

[0017] The drum protrusions on the inner peripheral surface of the drive drum are received in the recesses on the outer peripheral surface of the core, and the drum protrusions engage with the core recesses, thereby preventing misalignment between the drive drum and the core.

[0018] The drum protrusions are formed at positions behind the drum recesses, so that, for example, by locally pressing the positions of the drum recesses, the drum protrusions can be formed at the same time.

[0019] In the sixth aspect of the sheet shutter drive device, in the fifth aspect, the core includes, on one of the drive shafts, a first core of relatively small diameter that is arranged near the axial end and does not have the core recess formed therein, and a second core that is arranged near the axial center and has a relatively larger diameter than the first core and has the core recess formed therein.

[0020] Because multiple cores are attached to one drive shaft, rotational force can be transmitted from the cores to the drive drum more stably than in a structure where only one core is attached. The first core is positioned closer to the axial end than the second core, and is inserted into the inside of the drive drum before the second core when assembled inside the drive drum. The first core has a smaller diameter than the second core, making it easy to insert. The second core has a larger diameter than the first core, so it transmits rotational force to the drive drum more efficiently. The first core does not have a core recess, making it easy to mold. The second core has a core recess, so engagement with the drum protrusion can be effective in suppressing misalignment between the drive drum and the core.

[0021] In the seventh aspect of the sheet shutter drive device, in any one of the second to sixth aspects, the connecting member includes a core key groove formed on the inner surface of the core, a shaft key groove formed on the outer surface of the drive shaft, and a key accommodated in the core key groove and the shaft key groove.

[0022] The drive shaft and core can be connected with high positional accuracy using a simple structure in which the key is accommodated in the core keyway and shaft keyway.

[0023] In the sheet shutter drive device of the eighth aspect, in the seventh aspect, the length of the shaft keyway in the axial direction of the drive shaft is longer than the thickness of the core, both longitudinal ends of the key protrude from the core, and the collar is fixed to the core on both sides in the thickness direction of the core, and an auxiliary keyway in which the key is accommodated is formed on an extension of the core keyway.

[0024] The portions of the key that protrude from the core at both ends in the longitudinal direction are accommodated in the shaft keyway of the drive shaft and the auxiliary keyway of the collar. The collar is fixed to the core. Therefore, the portions of the key that protrude from the core can also transmit the rotation of the drive shaft to the core. Compared to a structure in which both ends of the key in the longitudinal direction do not protrude from the core, the portions of the key that transmit the rotation of the drive shaft to the core can be secured longer.

[0025] A shutter device of a ninth aspect includes a sheet shutter drive device of any one of the first to eighth aspects, the sheet that contacts the drive shaft of the sheet shutter drive device, and a winding roll that winds up the sheet.

[0026] The sheet wound onto the winding sheet is in contact with the drive shaft of the sheet shutter drive device, so that the sheet can be moved by the rotation of the drive shaft to open and close the opening of the building.

[0027] Since the outer peripheral surface of the drive drum is not painted, paint does not adhere to the sheet, and staining of the sheet can be suppressed. [Effects of the Invention]

[0028] The present disclosure can suppress staining of the sheet. [Brief explanation of the drawings]

[0029] [Figure 1] FIG. 1 is a perspective view showing a shutter device according to a first embodiment. [Figure 2] FIG. 2 is a perspective view showing an outline of a winding device for a sheet shutter in the shutter device of the first embodiment. [Figure 3] FIG. 3 is a perspective view showing the sheet shutter driving device of the first embodiment. [Figure 4] FIG. 4 is an exploded perspective view showing the sheet shutter driving device of the first embodiment. [Figure 5] FIG. 5 is a front view showing the sheet shutter driving device of the first embodiment. [Figure 6] FIG. 6 is a cross-sectional view taken along line 6-6 in FIG. 5, showing the sheet shutter driving device of the first embodiment. [Figure 7A] 7A is a cross-sectional view taken along line 7A-7A in FIG. 5, showing the sheet shutter driving device of the first embodiment. [Figure 7B] 7B is an enlarged cross-sectional view of a portion 7B in FIG. 7A showing the sheet shutter driving device of the first embodiment. [Figure 7C]FIG. 7C is a side view showing a core corresponding to FIG. 7A of the sheet shutter driving device of the first embodiment. [Figure 8A] 8A is a cross-sectional view taken along line 8A-8A in FIG. 5, showing the sheet shutter driving device of the first embodiment. [Figure 8B] 8B is an enlarged cross-sectional view of a portion 8B in FIG. 8A showing the sheet shutter driving device of the first embodiment. [Figure 8C] FIG. 8C is a side view showing a core corresponding to FIG. 8A of the sheet shutter driving device of the first embodiment. [Figure 9] FIG. 9 is a cross-sectional view showing the drive drum of the sheet shutter drive device of the first embodiment. [Figure 10] FIG. 10 is an enlarged cross-sectional view showing the sheet shutter driving device of the first embodiment at the position of the connecting member. [Figure 11] FIG. 11 is an enlarged cross-sectional view showing the sheet shutter driving device of the first embodiment at the position of the connecting member. [Figure 12] FIG. 12 is a side view showing the collar of the sheet shutter driving device of the first embodiment. [Figure 13] FIG. 13 is an explanatory diagram showing the relationship between the end portion of the sheet shutter driving device and the contact block of the first embodiment. [Figure 14] FIG. 14 is a cross-sectional view showing a sheet shutter driving device of a first modified example. [Figure 15] FIG. 15 is a cross-sectional view showing a sheet shutter driving device of a second modified example. DETAILED DESCRIPTION OF THE INVENTION

[0030] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that arrow H shown in the drawings indicates the up-down direction (vertical direction) of shutter device 10, arrow W indicates the width direction (horizontal direction) of shutter device 10, and arrow L indicates the depth direction (horizontal direction) of shutter device 10. In the following description, the direction indicated by arrow W in FIG. 1 will be referred to as the left side of shutter device 10, and the direction opposite to the direction indicated by arrow W will be referred to as the right side of shutter device 10. In the following description, the direction indicated by arrow L in FIG. 1 will be referred to as the rear side of shutter device 10, and the direction opposite to the direction indicated by arrow L will be referred to as the front side of shutter device 10.

[0031] Furthermore, the left-right direction of the shutter device 10 may be referred to as the "width direction," and the front-to-rear direction of the shutter device 10 may be referred to as the "shutter depth direction." Note that the above terms "left," "right," "front," and "rear" are directions defined for the sake of convenience. Therefore, the configuration of the shutter device 10 is not limited to these directions.

[0032] (Overall composition) 1 and 2, the shutter device 10 is an opening / closing device attached to an opening 16 of a building. The shutter device 10 includes a frame 12, a winding roll 24, a sheet shutter drive device 30, a sheet 32, and a contact block 80. The frame 12, the winding roll 24, the sheet 32, the sheet shutter drive device 30, and the contact block 80 are basically symmetrical in a front view with respect to a center line CL of the shutter device 10 in the width direction of the shutter device 10 (hereinafter referred to as the "width direction"). Note that the "width direction" also corresponds to the width direction of the opening 16. The opening 16 is, for example, an entrance to a room such as a freezer, a refrigerator, or a warehouse. Hereinafter, closing the opening 16 will sometimes be referred to as "closing," and opening the opening 16 will sometimes be referred to as "opening."

[0033] The shutter device 10 may be applied to entrances and window openings of a building, and can be applied to an opening 16 to be opened and closed so as to close the opening 16. The opening 16 to which the shutter device 10 is applied is specifically an opening formed in the side wall of a structure or the like, and opening in the lateral direction (side).

[0034] The shutter device 10 is configured symmetrically with respect to a center line CL in the width direction. That is, the shutter device 10 is configured symmetrically on the left and right.

[0035] (Frame 12) The frame 12 includes a pair of side frames 22 and a shutter case 18. The pair of side frames 22 each extend in the up-down direction (hereinafter referred to as the "up-down direction") of the shutter device 10, and are arranged on both sides of an opening 16 such as a loading entrance in the width direction, at both ends of the sheet 32 ​​in the width direction. The "up-down direction" also corresponds to the height direction of the opening 16 and the height direction of the sheet 32 ​​when the opening 16 is closed.

[0036] The cross section of the side frame 22 taken perpendicular to its longitudinal direction is U-shaped with an opening on the inner side in the shutter width direction (i.e., the side closer to the center line CL of the shutter device 10 in the width direction).

[0037] Furthermore, guide rails 14 (FIG. 2) extending in the vertical direction are disposed inside each of the pair of side frames 22. The pair of guide rails 14 guide the seat 32 in the vertical direction so that the seat 32 moves in the vertical direction.

[0038] As shown in FIG. 1 , the shutter case 18 is formed in a box shape and extends in the width direction so as to connect the upper ends of the pair of side frames 22. A cross section of the shutter case 18 cut in a direction perpendicular to its longitudinal direction has a rectangular tubular shape extending from above the side frames 22 to one side (the right side in the drawing) in the depth direction of the shutter device 10 (hereinafter referred to as the "shutter depth direction"). The interior of the shutter case 18 is hollow. The shutter case 18 protrudes forward relative to the pair of side frames 22. A rear surface 18B of the shutter case 18 is fixed to, for example, a wall surface (not shown) at the upper edge of the opening 16. The interior of the shutter case 18 is in communication with the interiors of the pair of side frames 22 and the pair of guide rails 14 through openings at the upper ends of the pair of side frames 22 and the pair of guide rails 14.

[0039] (winding roll 24) As shown in Fig. 2, the take-up roll 24 is a roll that takes up the sheet 32. The take-up roll 24 is disposed inside the shutter case 18 at one side in the shutter depth direction. One end of the sheet 32 ​​is attached to the take-up roll 24. This one end is the upper end when the sheet 32 ​​closes the opening 16 (hereinafter referred to as the "closed state").

[0040] The winding roll 24 extends in the width direction. In other words, the axial direction of the winding roll 24 is the width direction. Furthermore, the winding roll 24 is rotatably supported by a frame member (not shown). The winding roll 24 is biased, for example, by a biasing member (not shown), so as to rotate in a direction in which the sheet 32 ​​is wound up (hereinafter referred to as the "winding direction"). In this configuration, a force in the winding direction is applied to the sheet 32 ​​by the winding roll 24.

[0041] (Sheet shutter driving device 30) As shown in Fig. 2, the sheet shutter drive device 30 is a device that drives the sheet 32 ​​in the up and down direction. The sheet shutter drive device 30 is disposed inside the shutter case 18, on the other side in the shutter depth direction, and above the pair of guide rails 14. The sheet shutter drive device 30 is disposed along the width direction. In other words, the axial direction of the sheet shutter drive device 30 is the width direction.

[0042] As shown in FIGS. 3 to 6, the sheet shutter driving device 30 has a driving shaft , a driving drum , and a connecting member .

[0043] The drive shaft 34 is divided into a left drive shaft 34L and a right drive shaft 34R. The drive drum 36 is cylindrical and is disposed coaxially with the drive shaft 34. The left drive shaft 34L and the right drive shaft 34R are integrated via a connecting member 38 and the drive drum 36.

[0044] Both ends of the drive shaft 34 protrude in the axial direction beyond the drive drum 36. Both ends of the drive shaft 34 are rotatably supported by frame members (not shown).

[0045] A pair of gear members 28 are attached to the drive shaft 34 at both ends in the width direction of the drive drum 36. The gear members 28 are made of metal, for example, and have a plurality of gear teeth arranged in the circumferential direction, which engage with the guide blocks 41 of the seat 32.

[0046] The right drive shaft 34R has a step 40 formed at its end. The step 40 is a flat cutout portion of the outer periphery of the right drive shaft 34R. The boundary between the portion of the right drive shaft 34R where the step 40 is formed and the portion where it is not formed is a step.

[0047] A plurality of female threads 42 are formed on the end of the right drive shaft 34R. At least one female thread is formed on the step portion 40. A male screw (not shown) is screwed into the female thread 42, and a drive force transmission mechanism (not shown) and the like are fixed. A drive motor (not shown) is connected to the drive force transmission mechanism. The drive shaft 34 receives the drive force of the drive motor via the transmission mechanism, and rotates in the forward and reverse directions. The drive drum 36 also rotates integrally with the drive shaft 34.

[0048] The drive drum 36 is a cylindrical member made of aluminum. The outer peripheral surface of the drive drum 36 is anodized. This anodizing process forms an aluminum oxide coating on the outer peripheral surface of the drive drum 36. A portion of the sheet 32 ​​is wrapped around the drive drum 36 of the sheet shutter drive device 30.

[0049] As shown in Figures 3 to 5, drum recesses 44 are formed on the outer peripheral surface of the drive drum 36. As also shown in Figures 7A and 7B, the drum recesses 44 are recessed radially inward. There are multiple drum recesses 44, each extending in the axial direction of the drive drum 36. Each of the drum recesses 44 has a uniform shape in the axial direction of the drive drum 36. The drum recesses 44 are formed at equal intervals (central angles) in the circumferential direction of the drive drum 36. In this embodiment, there are three drum recesses 44, and the central angle θ1 in the circumferential direction is 120 degrees.

[0050] A plurality of bolt holes 46 are formed at predetermined positions in the drum recess 44. In each drum recess 44, the bolt holes 46 are formed at the same axial positions as the connecting members 38, as will be described later.

[0051] As will be described later, when the bolt 48 is inserted into the bolt hole 46 and screwed into the female thread 68 of the core 52, the head of the bolt 48 is housed in the drum recess 44 of the drive drum 36. This prevents the head of the bolt 48 from protruding from the outer circumferential surface of the drive drum 36.

[0052] On the inner peripheral surface of the drive drum 36, a drum convex portion 50 is formed. The drum convex portion 50 has a shape protruding radially inward. In the present embodiment, the drum convex portion 50 is formed at a position on the back side corresponding to the drum concave portion 44. Therefore, the drum convex portion 50 is located radially inward of the drum concave portion 44.

[0053] The number of drum convex portions 50 is the same as the number of drum concave portions 44, and each extends in the axial direction of the drive drum 36. The drum convex portion 50 has a constant shape in the axial direction of the drive drum 36. The drum convex portions 50 are formed at equal intervals (in this embodiment, a central angle of 120 degrees) in the circumferential direction of the drive drum 36.

[0054] As shown in FIG. 9, the inner diameter of the drive drum 36, specifically, the inner diameter of the portion where the drum convex portion 50 is not formed is D1. On the other hand, in the drive drum 36, the radius of the inscribed circle C2 at the position where the drum convex portion 50 is formed, that is, at the position of the drum convex portion 50, is D2. And there is a relationship of D2 < D1.

[0055] As shown in FIG. 4, two connecting members 38 are provided per one drive shaft 34. In the present embodiment, since there are two drive shafts 34 (left drive shaft 34L and right drive shaft 34R), there are four connecting members 3%8. Hereinafter, the connecting member closer to the center in the axial direction of the drive drum 36 may be distinguished as the connecting member 38A, and the connecting member closer to the end may be distinguished as the connecting member 38B.

[0056] As shown in FIG. 7A, the connecting member 38A has a core 52A, a bolt 48, and a coupling member 54. As shown in FIG. 8A, the connecting member 38B has a core 52B, a bolt 48, and a coupling member 54. The cores 52A and 52B are collectively referred to as the core 52.

[0057] As shown in Figures 10 and 11, the core 52 is a disk-shaped member having a predetermined thickness. The drive shaft 34 is inserted through the center of the core 52. The drive shaft 34 and the core 52 are connected and integrated by a connecting member 54, and the drive shaft 34 and the core 52 rotate together. In one drive shaft 34, a core 52B located near the end in the axial direction and a core 52A located near the center in the axial direction are attached to each of the left drive shaft 34L and the right drive shaft 34R. As will be described later, when the drive shaft 34 is inserted and fixed inside the drive drum 36, the core 52B is inserted into the drive drum 36 first, and then the core 52A is inserted into the drive drum 36. The core 52B is an example of a first core, and the core 52A is an example of a second core.

[0058] The coupling member 54 is configured to include a core keyway 56 , a shaft keyway 58 , and a key 60 .

[0059] Core keyway 56 is formed by partially expanding the diameter of the inner circumferential surface of the mounting hole in the center of core 52. Core keyway 56 continues from one end to the other axial end of core 52.

[0060] Shaft keyway 58 is formed on the outer peripheral surface of drive shaft 34 at a position corresponding to core keyway 56. Shaft keyway 58 is formed to be longer in the axial direction of drive shaft 34 than thickness T1 of core 52. Both ends of shaft keyway 58 in the longitudinal direction (axial direction) are curved in an arc shape, and are located outside core 52 in the axial direction.

[0061] As shown in Figures 7A and 8A, core keyway 56 and shaft keyway 58 form a keyhole that is continuous in the axial direction of core 52 and has a rectangular cross-sectional shape in the direction perpendicular to the axial direction.

[0062] The key 60 is housed in the core keyway 56 and the shaft keyway 58. When viewed in a direction perpendicular to the longitudinal direction (axial direction), the shape of the key 60 is a rectangle that engages with the keyhole formed by the core keyway 56 and the shaft keyway 58. As a result, the rotational force of the drive shaft 34 is transmitted to the core 52 via the key 60, causing the core 52 to rotate integrally with the drive shaft 34.

[0063] 10 and 11, the length L1 of the key 60 is longer than the thickness T1 of the core 52. Both ends of the key 60 in the longitudinal direction protrude from the core 52 in the axial direction.

[0064] 12 is attached to both sides of the core 52 in the thickness direction. The collars 62 are disk-shaped members with a smaller diameter than the core 52. The drive shaft 34 is inserted through the center of the collars 62.

[0065] An auxiliary key groove 64 is formed on the inner peripheral surface of the central mounting hole of the collar 62. The auxiliary key groove 64 has the same cross-sectional shape in a direction perpendicular to the axial direction as the core key groove 56 of the core 52. As a result, the auxiliary key groove 64 is formed on an axial extension of the core key groove 56. The portion of the key 60 that protrudes axially from the core 52 is received in the auxiliary key groove 64. In other words, the portion of the key 60 that protrudes axially from the core 52 engages with the shaft key groove 58 and the auxiliary key groove 64.

[0066] A retaining ring 66 is attached to the drive shaft 34 at a position further outward (outward in the axial direction) from the collar 62. The retaining ring 66 holds the collar 62 in a predetermined position in the axial direction and prevents the key 60 from falling off.

[0067] As shown in FIGS. 7C and 8C , a female thread 68 is formed on the outer circumferential surface of the core 52. The number of female threads 68 in one core 52 is equal to the number of drum recesses 44 in the drive drum 36. In this embodiment, the number of drum recesses 44 is three, and therefore the number of female threads 68 in one core 52 is also three. The multiple female threads 68 are formed at regular intervals around the circumferential direction of the core 52. In this embodiment, the three female threads 68 are formed at positions where the central angle θ1 is 120 degrees. The female threads 68 correspond one-to-one to the bolts 48. The bolts 48 inserted into the bolt holes 46 in the drive drum 36 are screwed into the female threads 68. This fastens the drive drum 36 to the core 52. As also shown in FIGS. 7B and 8B , the heads of the bolts 48 are housed in the drum recesses 44 and do not protrude from the outer circumferential surface of the drive drum 36. In particular, as shown in FIG. 13, the head of the bolt 48 does not protrude toward the inner surface 80N of the contact block 80.

[0068] As shown in Fig. 7C, core recesses 70 are formed on the outer peripheral surface of the core 52A. The positions at which the core recesses 70 are formed correspond to the drum protrusions 50 of the drive drum 36. Therefore, the number of core recesses 70 in one core 52A is equal to the number of drum protrusions 50 of the drive drum 36. In this embodiment, the number of drum protrusions 50 is three, and therefore the number of core recesses 70 in one core 52A is also three. The drum protrusions 50 are housed in the core recesses 70.

[0069] Each of the plurality of core recesses 70 is continuous from one end to the other end in the axial direction of the core 52A.

[0070] The outer diameter D3 of the core 52A (the outer diameter D3 of the portion where the core recess 70 is not formed) is slightly smaller than the inner diameter D1 of the drive drum 36 and larger than the inner diameter D2. Furthermore, the outer diameter D4 of a circle passing through the portion of the core 52A where the core recess 70 is formed is slightly smaller than the inner diameter D2 of the drive drum 36.

[0071] 8C, no recess corresponding to the core recess 70 of the core 52A is formed in the outer peripheral surface of the core 52B. The outer diameter D5 of the core 52B is slightly smaller than the inner diameter D2 of the drive drum 36. This outer diameter D5 may be equal to the inner diameter D4 of the core 52A. Furthermore, the overall outer diameter of the core 52B (outer diameter D5) is smaller than that of the core 52A (outer diameter D3).

[0072] (contact block 80) 2, a pair of contact blocks 80 are provided, and are arranged at the other side in the shutter depth direction and at both end sides in the shutter width direction inside the shutter case 18. Specifically, the contact block 80 is arranged opposite the gear member 28 in the sheet shutter driving device 30.

[0073] The contact block 80 is formed in an arc shape using a metal material (made of zinc die-cast in this embodiment) and is attached to a frame member (not shown). In this configuration, as shown in Fig. 13, when the guide block 41 engaged with the gear member 28 moves outward in the gear radial direction, it comes into contact with an inner surface 80N of the contact block 80, thereby preventing further movement of the guide block 41. This maintains the engagement between the gear member 28 and the guide block 41.

[0074] The seat 32 is disposed between a pair of side frames 22. The seat 32 is guided by left and right guide rails 14 erected at both ends of the width direction of the opening 16 of the building, allowing the opening 16 to be opened and closed.

[0075] The sheet 32 ​​is formed in a sheet shape with its thickness direction being the depth direction of the shutter in the closed state. The sheet 32 ​​is formed, for example, from a resin material and has flexibility that allows it to be deformed into a roll along the outer circumferential surface of the drive drum 36. Note that the material of the sheet 32 ​​is not limited to a resin material, and various materials can be used as long as the sheet 32 ​​has such flexibility. The sheet 32 ​​is formed in a rectangular shape that extends in the movement direction of the sheet 32. The end of the sheet 32 ​​in the movement direction is attached to the winding roll 24 (FIGS. 1 and 2).

[0076] When wrapped around the sheet shutter driving device 30, the sheet 32 ​​hangs down by its own weight and closes the opening 16. In the closed state, the sheet 32 ​​is disposed between the pair of side frames 22, as shown in FIG.

[0077] Next, the effects of this embodiment will be described.

[0078] The driving force of a drive motor (not shown) acts on the drive shaft 34 via a transmission mechanism (not shown). The drive shaft 34 and the drive drum 36 are connected by a connecting member 38, so the drive drum 36 rotates integrally with the drive shaft 34. This causes the sheet 32 ​​wrapped around the drive drum 36 to move up and down.

[0079] The drive drum 36 is made of aluminum, which allows for a lighter weight compared to a configuration made of a metal other than aluminum.

[0080] An aluminum oxide coating is formed on the outer peripheral surface of the drive drum 36 by anodizing. Therefore, compared to a configuration that is not anodized, the desired durability can be achieved without painting the outer peripheral surface of the drive drum 36. Because the outer peripheral surface of the drive drum 36 is not painted, paint does not adhere to the sheet 32, and staining of the sheet 32 ​​can be suppressed.

[0081] The connecting member 38 has a core 52 through which the drive shaft 34 and the drive drum 36 can be connected.

[0082] The core 52 is disk-shaped and is fixed coaxially to the drive shaft 34. Because the disk-shaped core 52 supports the drive drum 36 from the inner peripheral side, the cylindrical shape of the drive drum 36 can be maintained by the core 52. In addition, the drive drum 36 can be maintained coaxially with the drive shaft 34 by the core 52.

[0083] The drive drum 36 is fastened and fixed to the core 52 with bolts 48. If welding were used to secure the drive drum 36 to the core 52, it would be difficult to maintain the positional accuracy between the core 52 and the drive drum 36. However, in this embodiment, the positional accuracy between the core 52 and the drive drum 36 can be maintained. Furthermore, if welding were used to secure the drive drum 36 to the core 52, and the drive drum 36 were to be coated with a baking paint, the paint could adhere to the sheet 32. However, in this embodiment, the drive drum 36 is not coated, so the paint does not adhere to the sheet 32. In this embodiment, welding is not used to connect the drive shaft 34 and the drive drum 36, so welding fumes (chemical substances generated during welding) are not generated. Furthermore, if the drive drum 36 were welded to the core 52, distortion caused by welding could cause eccentricity (off-center). However, in this embodiment, the core 52 and the drive drum 36 are secured without welding, so eccentricity between the core 52 and the drive drum 36 is reduced.

[0084] In this embodiment, bolts 48 are used as an example of fastening members. The drive drum 36 can be fixed to the core 52 with a simple structure and operation of inserting the bolts 48 into the bolt holes 46 of the drive drum 36 and screwing the bolts 48 into the female threads 68 of the core 52.

[0085] The heads of the bolts 48 are housed in the drum recesses 44 of the drive drum 36, and therefore do not protrude from the outer peripheral surface of the drive drum 36. This prevents the heads of the bolts 48 from coming into contact with the seat 32, thereby preventing damage to the seat 32.

[0086] Furthermore, it is not necessary to form a recess by performing a counterbore or other process on the outer peripheral surface of the drive drum 36 in order to prevent the head of the bolt 48 from protruding from the outer peripheral surface of the drive drum 36. Furthermore, by forming the drum recess 44, a shape that prevents the head of the bolt 48 from protruding from the outer peripheral surface of the drive drum 36 can be stably obtained.

[0087] In this embodiment, two cores 52 are attached to one drive shaft 34. Compared to a structure in which one core 52 is attached to one drive shaft 34, rotational force can be transmitted from the cores 52 to the drive drum 36 more stably.

[0088] When the drive shaft 34 and the connecting member 38 are assembled to the drive drum 36, the core 52B is inserted into the inside of the drive drum 36 before the core 52A. The core 52B has a smaller diameter than the core 52A, so it is easy to insert it into the inside of the drive drum 36. In contrast, the core 52A has a larger diameter than the core 52B, so it transmits rotational force to the drive drum 36 more easily.

[0089] Furthermore, when the core 52A is inserted inside the drive drum 36, the drum protrusion 50 on the inner peripheral surface of the drive drum 36 is housed in the core recess 70 on the outer peripheral surface of the core 52A, so that the core 52A can be positioned circumferentially relative to the drive drum 36. By positioning the core 52A relative to the drive drum 36, the connecting member 54A, drive shaft 34, and connecting member 54B can also be positioned circumferentially relative to the drive drum 36. By engaging the drum protrusion 50 with the core recess 70, the rotation of the core 52 can be transmitted to the drive drum 36 by this engaged portion, and relative misalignment in the circumferential direction can be suppressed.

[0090] In this embodiment, the drum protrusions 50 are formed on the inner and outer peripheral surfaces at the same positions as the drum recesses 44. Therefore, for example, by locally pressing the positions of the drum protrusions 50 from the outer peripheral surface side of the drive drum 36 to form the drum recesses 44, the drum recesses 44 can be formed at the same time.

[0091] Core 52 is connected and fixed to drive shaft 34 by connecting member 54. When welding is used to fix core 52 to drive shaft 34, it is difficult to maintain the positional accuracy between drive shaft 34 and core 52. However, in this embodiment, the positional accuracy between drive shaft 34 and core 52 can be maintained.

[0092] In this embodiment, the coupling member 54 has a structure in which a key 60 engages with a shaft keyway 58 and a core keyway 56. In other words, with the simple structure in which the key 60 engages with the shaft keyway 58 and the core keyway 56, the core 52 can be coupled to the drive shaft 34 while maintaining positional accuracy.

[0093] A collar 62 fixed to the core 52 is formed with an auxiliary keyway 64 on the axial extension of the core keyway 56. Both longitudinal ends of the key 60 protrude axially from the core 52, and these protruding portions are housed in the auxiliary keyway 64. That is, the portion of the key 60 that protrudes axially from the core 52 engages with the shaft keyway 58 and the auxiliary keyway 64. This makes it possible to effectively use the key 60, which is longer than the thickness T1 of the core 52, to achieve a structure that transmits the rotational force of the drive shaft 34 to the core 52.

[0094] In this embodiment, the outer diameter D5 of core 52B is smaller than the outer diameter D3 of core 52A. Core 52B is located closer to the axial end of each of left drive shaft 34L and right drive shaft 34R than core 52A. That is, when cores 52A and 52B are attached to the inside of drive drum 36, core 52B is inserted into the inside of drive drum 36 before core 52A. Because core 52B, which has a relatively smaller outer diameter, is inserted before core 52A, the insertion process is easy. Furthermore, because core 52A has a larger outer diameter than core 52B, this structure makes it easier to transmit rotational force from core 52A to drive drum 36.

[0095] 13, in this embodiment, the head of the bolt 48 is housed in the drum recess 44 and does not protrude toward the inner surface 80N of the contact block 80. Since the head of the bolt 48 does not protrude, there is no need to form a stepped female thread in the drive drum 36, improving productivity. Furthermore, while it is difficult to maintain machining accuracy when forming a stepped female thread, in this embodiment, it is easy to maintain machining accuracy of the female thread 42.

[0096] Because the head of the bolt 48 does not protrude toward the inner surface 80N of the contact block 80, it is easy to insert a jig or tool between the drive drum 36 and the contact block 80. For example, it becomes easy to insert a jig between the drive drum 36 and the contact block 80 to measure the distance between the gear member 28 and the guide block 41. Furthermore, it becomes easier to perform inspections and measurements during manufacturing and maintenance of the sheet shutter drive device 30, which contributes to maintaining quality and results in a structure that is easy to maintain.

[0097] In this embodiment, it is also possible to use the structures of the reference examples shown in FIGS. 14 and 15 in combination.

[0098] In a sheet shutter driving device 90 of a first reference example shown in Fig. 14, the outer peripheral surface of the driving drum 36 is entirely covered with a cylindrical cover 92. The cover 92 makes it possible to realize a structure in which the outer peripheral surface of the driving drum 36 and the sheet 32 ​​do not come into direct contact with each other.

[0099] In a sheet shutter drive device 94 of a second reference example shown in Fig. 15, a plurality of puffing members 96 are attached to the outer peripheral surface of the drive drum 36. The puffing members 96 are arranged at predetermined intervals in the axial direction of the drive drum 36. These puffing members 96 also make it possible to realize a structure in which the outer peripheral surface of the drive drum 36 and the sheet 32 ​​do not come into direct contact with each other.

[0100] The configurations described in the above embodiments and reference examples can also be used in appropriate combinations. [Explanation of symbols]

[0101] 10 Shutter device 12 frames 14 Guide rail 16 Opening 18 Shutter Case 22 Side frame 24 Winding roll 28 Gear parts 30 Sheet shutter drive device 32 seats 34 Drive shaft 36 Drive drum 38 Connecting member 41 Guide Block 42 female thread 44 Drum recess 46 bolt holes 48 volts 50 Drum protrusion 52 Core 54 Connecting member 56 Core keyway 58 Shaft keyway 60 keys 62 Color 64 Auxiliary keyway 66 Retaining ring 68 Female thread 70 Core recess 80 Contact Block 90 Sheet shutter drive unit 92 Cover 94 Sheet shutter drive unit 96 Puffing material

Claims

1. A sheet shutter driving device for driving an openable and closable sheet to close an opening in a building, a drive shaft that rotates upon receiving a driving force; a cylindrical drive drum arranged coaxially with the drive shaft and having an anodized outer circumferential surface; a connecting member that connects the drive shaft and the drive drum; A sheet shutter drive device having the same.

2. The connecting member is a disk-shaped core that is coaxially attached to the drive shaft; a fastening member that fastens the driving drum and the core; a connecting member that connects the drive shaft and the core; The sheet shutter driving device according to claim 1 , further comprising:

3. 3. The sheet shutter driving device according to claim 2, wherein the fastening member includes a bolt that penetrates the driving drum and is screwed onto the outer peripheral surface of the core so that its head does not protrude from the outer peripheral surface of the driving drum.

4. 4. The sheet shutter driving device according to claim 3, wherein a drum recess for accommodating the head of the bolt is formed on the outer peripheral surface of the driving drum.

5. a drum protrusion protruding radially inward at a rear side position of the drum recess is formed on the inner peripheral surface of the drive drum, The sheet shutter driving device according to claim 4, wherein a core recess for receiving the drum protrusion is formed on the outer peripheral surface of the core.

6. The sheet shutter drive device described in claim 5, wherein the core includes, on one of the drive shafts, a first core of relatively small diameter that is located near the axial end and does not have the core recess formed therein, and a second core that is located near the axial center and has a relatively larger diameter than the first core and has the core recess formed therein.

7. The coupling member is a core key groove formed on the inner peripheral surface of the core; a shaft keyway formed on an outer peripheral surface of the drive shaft; a key accommodated in the core keyway and the shaft keyway; The sheet shutter driving device according to claim 2 , further comprising:

8. a length of the shaft keyway in the axial direction of the drive shaft is longer than a thickness of the core; Both ends of the key in the longitudinal direction protrude from the core, 8. The sheet shutter drive device according to claim 7, further comprising collars fixed to the core on both sides in the thickness direction of the core, the collars having auxiliary key grooves in which the keys are accommodated formed on the extensions of the core key grooves.

9. The sheet shutter driving device according to claim 1; the sheet that comes into contact with the drive shaft of the sheet shutter drive device; a winding roll that winds up the sheet; A shutter device having:

Images