JP7634393B2 - Winding drive unit - Google Patents

Description

This disclosure relates to a winding drive device.

Conventionally, there is known technology for electrically winding up materials such as shutters and roller screens. To perform the electrically winding operation, a shaft-shaped winding drive device is placed inside the outer pipe around which the screen material is wound. The winding drive device is equipped with a motor and a circuit board for rotating the pipe (see, for example, Patent Document 1).

JP 2018-71399 A

To make the pipe that winds the material thinner and more compact, it is desirable to make the winding drive device placed inside the pipe itself thinner and reduce the cross-sectional dimensions.

The present disclosure relates to a winding drive device that includes a motor, a support portion that is connected to one axial end of the motor and extends along the motor to the other axial end, and has a pair of fixing pieces that face each other to fix the motor, and a bearing portion that is disposed on the other axial end of the motor and into which the motor and the pair of fixing pieces are inserted.

FIG. 2 is a front view showing the roller blind of the present embodiment. FIG. 2 is a partial cross-sectional view of the winding drive device of the present embodiment. FIG. 2 is a development view of the winding drive device of the embodiment. FIG. 2 is a front view of the motor of the present embodiment as viewed from the bearing side. FIG. 2 is a perspective view of the bearing portion of the embodiment as viewed from the inside. FIG. 4 is a front view of the bearing portion of the embodiment as viewed from the outside.

The following describes an embodiment of the present invention in detail with reference to the drawings. The roller blind 100 of this embodiment is arranged in a daylighting section of a building, such as a window. The roller blind 100 of this embodiment has a frame section 110, a pipe 111, a screen 120, and a winding drive device 1.

The frame unit 110 is a box-shaped cover that is attached above a window (not shown), for example, inside a building. The frame unit 110 covers the pipe 111 and the winding drive device 1. The frame unit 110 has a horizontally elongated shape that is long in the direction of the window.

The screen 120 is a thin, flat material with low rigidity that covers an opening such as a window and blocks outside views and sunlight. Examples of the screen 120 include fabric and a resin sheet, but the material is not limited.

The pipe 111 is a hollow, elongated cylinder that extends from one end of the frame section 110 to the other. An end of the screen 120 is fixed to the outside of the pipe 111. As the pipe 111 rotates, the screen 120 is wound up or hung from the pipe 111. A winding drive device 1, which will be described later, is disposed on one side of the end inside the pipe 111. A spring set 112, which can also be used manually, is disposed on the other side inside the pipe 111.

The winding drive device 1 is fixed to the pipe 111 and rotates the pipe 111. As shown in Figures 2 and 3, the winding drive device 1 has a motor 2, a gear head 3, a magnet 4, a substrate 5, a bracket 6 as a support, a bearing unit 7, an adapter 8, and a control device 9.

The motor 2 has a motor body 21, a rotating shaft 22, and an output shaft 23. The motor body 21 is arranged along the longitudinal direction of the pipe 111. As shown in Figs. 3 and 4, the motor body 21 is oval-shaped in cross section (an elliptical track shape with a straight line in one part), and the inside is formed into a solid column. That is, the motor body 21 has a pair of flat surfaces 211 facing each other in cross section, and a pair of curved surfaces 212 connecting the pair of flat surfaces 211 and facing each other. The rotating shaft 22 is a small diameter shaft that passes through approximately the center of the motor body 21. The rotating shaft 22 extends outward from the other end 21b side of the motor body 21. The output shaft 23 extends outward from one end 21a side of the motor body 21.

The gear head 3 is disposed at the end on the one end 21a side of the motor body 21. The gear head 3 is a reduction mechanism that reduces the speed of the motor 2. As shown in FIG. 2, the outer diameter of the gear head 3 is larger than the dimension connecting two opposing points on the outer surface of the motor 2.

The magnet 4 is disposed on the other end 21b of the motor body 21, which is the axial end of the motor 2. The magnet 4 is rotatably attached to the rotating shaft 22. The magnet 4 has a disk-like shape with a hole in the center through which the rotating shaft 22 can be inserted. The magnet 4 rotates while connected to the rotating shaft 22. The magnet 4, together with a sensor 52 described later, constitutes a magnetic encoder that detects the rotation of the motor 2.

The substrate 5 is disposed and fixed at the other end 21b of the motor body 21, which is the axial end of the motor 2. A sensor 52 for detecting the rotation speed of the magnet 4 is disposed on the substrate 5. A plurality of harnesses 51 extend from the substrate 5, transmitting input/output of the motor 2 and input/output of the sensor 52 to an external control device 9. As shown in FIG. 3, the substrate 5 has the same oval shape as the other end of the motor body 21 in a plan view, and has a pair of opposing flat surfaces 511 and a curved surface 512 connecting the flat surfaces 511 to each other. In FIG. 4, the substrate 5 is omitted in order to show the shape of the end face of the motor body 21, but the substrate 5 has the same shape as the end face of the motor body 21 in a plan view.

The bracket 6 is a support member for fixing the motor 2 and gear head 3 inside the pipe 111. The bracket 6 has a connection part 61 and a pair of fixing pieces 62. As shown in FIG. 3, the connection part 61 is connected to an end face of the gear head 3 at one end side of the axial direction of the motor 2.

The pair of fixed pieces 62 are arranged in pairs facing each other on the outside of the gear head 3 and the motor 2. As shown in FIG. 3, the pair of fixed pieces 62 are provided on the outside of the pair of flat surfaces 211 of the motor body 21, extending from one end side to the other end side along the motor 2. The pair of fixed pieces 62 are narrow metal plates, and are bent at approximately a right angle from the gear head 3 side to a position beyond the motor 2, the substrate 5, and the magnet 4. The pair of fixed pieces 62 are bent in a direction approaching each other at the intermediate portion from the one end side to the other end side where the fixed pieces 62 extend. The pair of fixed pieces 62 have a first fixed piece 621, a second fixed piece 622, and a step 63. The first fixed piece 621 is a portion that extends to one end side of the motor 2 and is connected to the gear head 3. The second fixed piece 622 is a portion that extends from the end of the first fixed piece 621 to the other end 2b side of the motor 2. The step 63 is formed between the first fixed piece 621 and the second fixed piece 622. As shown in FIG. 2, when comparing the distance D1 between the first fixed pieces 621 on the connection portion 61 side and the distance D2 between the pair of second fixed pieces 622, the distance D1 is greater than the distance D2. The step 63 is bent at an angle and formed at the boundary between the portion where the distance D1 is formed and the portion where the distance D2 is formed. The pair of fixed pieces 62 are inserted into the bearing portion 7 described below to fix the motor 2.

The bearing unit 7 is disposed at the end of the winding drive device 1, i.e., the other end 2b side of the motor 2, and is a member into which the motor 2 is inserted. The bearing unit 7 is attached to the end of the pipe 111 and fixed to the end of the frame unit 110. The bearing unit 7 has a tube portion 71, a disk portion 72, and a restricting portion 73.

The cylindrical portion 71 has a cylindrical shape extending along the insertion direction of the motor 2. An end of the motor 2, i.e., the other end 2b and a pair of fixing pieces 62 are inserted into the cylindrical portion 71. The cylindrical portion 71 has a pair of flat portions 710 and a pair of curved portions 714. The pair of flat portions 710, a part on the periphery of the cylindrical portion 71 and another part facing this part, form the flat wall surface of the cylindrical portion 71. The pair of flat portions 710 are the parts where the fixing piece 62 is located when the fixing piece 62 is inserted inside the cylindrical portion 71. The distance D3 connecting the opposing outer surfaces of the cylindrical portion 71 is greater than the distance D1 between the first fixing pieces 621 of the pair of fixing pieces 62. The distance D3 is the distance connecting the pair of flat portions 710 of the cylindrical portion 71. The pair of curved portions 714 have a curved surface that connects the pair of flat portions 710.

The cylindrical portion 71 has an opening 71a at one end. As shown in FIG. 6, the inside of the cylindrical portion 71 is partitioned by ribs formed inward from the peripheral wall that constitutes the cylindrical portion 71. A fixed piece insertion portion 711 and a harness insertion portion 712 into which a pair of fixed pieces 62 are inserted are formed on the inside of the cylindrical portion 71. The fixed piece insertion portion 711 and the harness insertion portion 712 will be described later.

The disk portion 72 has a generally disk-like shape that closes the other end of the tube portion 71. The outer shape of the disk portion 72 is larger than the outer diameter of the tube portion 71. The disk portion 72 has a through hole 721, a screw hole 722, and a fixed piece guide wall 723.

As shown in FIG. 6, the through hole 721 is formed on the circumferential outside of the outer edge of the magnet 4 in a cross-sectional view of the bearing portion 7. The through hole 721 has an arc-shaped portion along the outer periphery of the disk portion 72 and a straight portion connecting two opposing points on the outer periphery of the disk portion 72. The screw hole 722 is a hole for inserting a screw for fixing to the frame portion 110. As shown in FIG. 3, multiple harnesses 51 extending from the substrate 5 can be inserted into the through hole 721 in a direction away from the motor 2. As shown in FIG. 6, the through hole 721 is disposed on the circumferential outside of the outer diameter of the magnet 4 in a cross-sectional view of the bearing portion 7.

The fixed piece guide wall 723 is a rib that rises from the inner surface of the disk portion 72 and protrudes inward from the inner wall of the tube portion 71. The fixed piece guide wall 723 is disposed on the side opposite the side on which the through hole 721 of the disk portion 72 is formed. The fixed piece guide wall 723 is formed as a pair so as to protrude inward from two opposing points on the periphery of the tube portion 71. The fixed piece guide wall 723 guides the fixed piece 62 to be inserted toward the center of the disk portion 72 from the fixed piece guide wall 723.

The restricting portion 73 is composed of a rib rising from the inner surface of the disk portion 72. The restricting portion 73 is formed on the side of the linear portion of the through hole 721. The through hole 721 is formed on the outer periphery of the restricting portion 73. As shown in FIG. 5, the restricting portion 73 is formed at a position away from the fixed piece guide wall 723 and facing the fixed piece guide wall 723. The restricting portion 73 rises continuously so as to connect the two opposing points of the cylindrical portion 71, whereas the fixed piece guide wall 723 is formed as a pair protruding from two opposing points of the cylindrical portion 71. As shown in FIG. 5, the restricting portion 73 has an approximately U-shaped shape in a vertical cross-sectional view of the bearing portion 7, and has a high height portion 73a and a low height portion 73b. The high height portion 73a is formed as a pair on the peripheral side of the cylindrical portion 71 and extends from the inner surface of the disk portion 72 to the end of the cylindrical portion 71. The short portion 73b is located closer to the inner circumference of the tube portion 71 than the tall portion 73a, connects the pair of tall portions 73a together, and extends along the side of the through hole 721. The short portion 73b rises from the inner surface of the disk portion 72 to a lower height than the tall portion 73a. The restricting portion 73 separates the through hole 721 from the rest of the interior of the tube portion 71.

As shown in FIG. 6, a fixed piece insertion portion 711 into which a pair of fixed pieces 62 can be inserted is formed inside the restricting portion 73, the fixed piece guide wall 723, and the flat portion 710 of the tube portion 71. The fixed piece insertion portion 711 and the through hole 721 are separated by the restricting portion 73, and the side of the restricting portion 73 toward the through hole 721 forms the harness insertion portion 712.

The restricting portion 73 restricts the movement of the harness 51 passing through the through hole 721, and restricts the harness 51 to extend toward the harness insertion portion 712. The restricting portion 73 stands between the through hole 721 and the fixed piece insertion portion 711 as a barrier, so that the harness 51 passing through the through hole 721 does not enter the fixed piece insertion portion 711. As shown in FIG. 2, the second fixed piece 622 is inserted inside the fixed piece insertion portion 711, and the end of the other end 21b side of the motor main body 21, the substrate 5, and the magnet 4 are arranged inside the pair of second fixed pieces 622. The magnet 4 rotates according to the rotating shaft 22 of the motor 2, but the restricting portion 73 prevents the harness 51 from interfering with the rotating magnet 4.

The adapter 8 is disposed opposite the bearing portion 7 and is a substantially disk-shaped part fixed to the output shaft 23 of the motor. The adapter 8 is connected to a large diameter portion 81 and a small diameter portion 82. The outer diameter of the large diameter portion 81 has a dimension that allows it to be fixed to the inner circumference of the pipe 111. The small diameter portion 82 is a substantially circular protrusion that has an outer diameter smaller than that of the large diameter portion 81 and is located approximately in the center of the large diameter portion 81 and protrudes outward from the large diameter portion 81. The small diameter portion 82 is fixed to the output shaft 23 of the motor 2 inside. The fixing method can be, for example, so-called D-cut fixing, but is not particularly limited.

The control device 9 is connected to the harness 51. The control device 9 is connected to a power source (not shown). The control device 9 estimates the position of the screen 120 based on the number of rotations of the magnet 4 read by the sensor 52, and drives the winding drive device 1 to open and close the screen 120.

According to this embodiment, the following effects are achieved. The winding drive device 1 is configured to include a motor 2, a support section 6 connected to one axial end of the motor 2 and extending along the motor 2 to the other end, and having a pair of opposing fixed pieces 62 for fixing the motor 2, and a bearing section 7 arranged on the other end of the motor 2 into which the motor 2 and the pair of fixed pieces 62 are inserted. By arranging the fixed pieces 62 that support the motor 2 so as to extend from one end of the motor 2 to the other end and configuring the fixed pieces 62 to have a pair of opposing fixed pieces 62, it is possible to reduce the cross-sectional dimensions of the winding drive device 1 compared to, for example, a case in which the entire outer periphery of the motor 2 is surrounded by a tubular member. Furthermore, by inserting the motor 2 and the pair of fixed pieces 62 into the bearing section 7, the motor 2 can be sufficiently supported even if the pair of fixed pieces 62 are located only on the outside of the two opposing points around the motor 2, so that the winding drive device 1 can be made smaller.

According to this embodiment, the motor 2 is formed in a columnar shape with a generally oval cross section, having a pair of flat surfaces 211 facing each other and a pair of curved surfaces 212 connecting the pair of flat surfaces 211 and facing each other. This allows the pair of fixing pieces 62 to be arranged so as to extend along the motor 2 outside the pair of flat surfaces 211. Therefore, the distance between the pair of fixing pieces 62 of the bracket 6 supporting the motor 2 can be made shorter than when the motor 2 is cylindrical. If the distance between the fixing pieces 62 is short, the width dimension of the cross section of the winding drive device 1 itself, including the motor 2 and the bracket 6, becomes smaller. In other words, the winding drive device 1 can be made thinner. This allows the winding drive device 1 to be made smaller in size, and can be housed in a pipe 111 with a small diameter.

According to this embodiment, the pair of fixing pieces 62 are bent in a direction approaching each other at the midpoint between the one end and the other end. This makes the distance between the pair of fixing pieces 62 shorter at the other end than at the one end. Therefore, even if a cylindrical bearing portion 7 or the like is disposed at the other end, it is possible to make the width dimension of the cross section of the winding drive device 1 small and narrow.

According to this embodiment, the pair of fixed pieces 62 includes a pair of first fixed pieces 621 extending to one end side, and a pair of second fixed pieces 622 extending from the pair of first fixed pieces 621 to the other end side. The bearing section 7 includes a tubular section 71 into which the motor 2 and the pair of fixed pieces 62 are inserted, and the distance D3 connecting the opposing outer surfaces of the tubular section 71 is made greater than the distance D1 connecting the pair of first fixed pieces 621. Because the distance D3 connecting the opposing outer surfaces of the tubular section 71 is greater than the distance D1 connecting the pair of first fixed pieces 621, it is possible to narrow the pipe 111 into which the winding drive device 1 is inserted to a dimension that allows the tubular section 71 of the bearing section 7 to be inserted.

The present disclosure is not limited to the above embodiment, and modifications, improvements, etc. within the scope of achieving the object of the present disclosure are included in the present disclosure. In the above embodiment, the motor body 21 of the motor 2 is described as being oval in cross section. However, as long as the motor 2 and the fixed piece 62 can be inserted into the bearing portion 7, the cross-sectional shape of the motor 2 is not important. For example, the motor body may be cylindrical and circular in cross section. In this case, it is preferable that the outer diameter of the gear head is larger than the outer diameter of the motor. Comparing the distance D1 between the first fixed pieces 621 of the bracket 6 and the distance D2 between the pair of second fixed pieces 622, it is preferable that the distance D1 is larger than the distance D2. It is preferable that the distance D3 connecting the opposing outer surfaces of the cylindrical portion 71 in the bearing portion 7 is larger than the distance D1 between the first fixed pieces 621 in the pair of fixed pieces 62. If the relationship between these distances D1, D2, and D3 is established, it is easy to insert the motor and the fixed piece into the bearing portion 7.

In the above embodiment, the shape of the substrate 5 has been described as being oval in plan view, the same as the other end of the motor body 21. However, if the motor is circular in cross section, the shape of the substrate and the motor may be circular.

In the above embodiment, an example was described in which the outer diameter of the gear head 3 is larger than the dimension connecting two opposing points on the outer surface of the motor 2, but it may be the same as or smaller than the dimension connecting two opposing points on the outer surface of the motor 2.

Furthermore, if the cross-sectional shape of the motor body 21 and the substrate 5 is approximately oval, and the relationship between the distance D1 between the pair of first fixed pieces 621, the distance D2 between the pair of second fixed pieces 622, and the distance D3 connecting the opposing outer surfaces of the cylindrical portion 71 in the bearing portion 7 is similar to the relationship described in the above embodiment, the fixed pieces 62 of the bracket 6 do not have to extend along the motor 2 outside the pair of flat surfaces 211 of the motor body 21. The pair of fixed pieces 62 may be along the curved surface 212 of the motor body 21.

Furthermore, in the above embodiment, the fixing piece 62 is described as being bent and formed with a step 63 between the pair of first fixing piece 621 and second fixing piece 622. However, the fixing piece may be linear.

In the above embodiment, the rotation speed of the motor 2 is detected by a magnetic encoder using the magnet 4 and the sensor 52. However, the device for detecting the rotation speed of the motor 2 is not limited to a magnetic encoder. It may be an optical encoder having a disk-shaped member.

In the above embodiment, an example was described in which the winding drive device 1 was installed on a roll screen 100 that was placed in a daylighting section. However, the winding drive device 1 may also be used in screens for video projection, smoke-proof sheets, shutters with small outer diameters, etc.

REFERENCE SIGNS LIST 1 Winding drive device, 2 Motor, 6 Bracket, 7 Bearing portion, 71 Cylinder portion, 211 Flat surface, 212 Curved surface, 621 First fixed piece, 622 Second fixed piece

Claims (3)

A motor;
a support portion connected to one end of the motor in the axial direction and extending along the motor toward the other end, the support portion having a pair of fixing pieces facing each other for fixing the motor;
a bearing portion disposed on the other end side of the motor and into which the motor and the pair of fixed pieces are inserted,
The pair of fixed pieces are bent in a direction approaching each other at a middle portion between the one end side and the other end side of the winding drive device. The winding drive device according to claim 1, wherein the motor is formed in a columnar shape with a generally oval cross section, having a pair of flat surfaces facing each other and a pair of curved surfaces connecting the pair of flat surfaces and facing each other. the pair of fixed pieces includes a pair of first fixed pieces extending toward the one end side, and a pair of second fixed pieces extending from ends of the pair of first fixed pieces at the intermediate portion on the other end side toward the other end side,
the bearing portion has a cylindrical portion into which the motor and the pair of fixed pieces are inserted,
The winding drive device according to claim 1 , wherein a distance between the opposing outer surfaces of the cylindrical portion is greater than a distance between the pair of first fixed pieces.

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