Winding shaft mounting structure for electric shutter device

Abstract

To provide a winding shaft mounting structure of an electric shutter device capable of reducing repair costs in the event of a problem with the electric motor.SOLUTION: The winding shaft mounting structure of an electric shutter device is a device for attaching a winding shaft 31 with a shaft 31a at one end and a motor case 31b at the other end to an existing side plate 134 of an existing shutter case 130 provided with an existing case bracket 136 having multiple protrusions 136a. The motor case 31b is provided with a fitting portion 40, and an adapter 80 having a case attachment portion 81 fitted to the fitting portion 40 and a bracket attachment portion 82 engaged with the projection 136a of the existing case bracket 136 is interposed between the motor case 31b and the existing case bracket 136.SELECTED DRAWING: Figure 14

Description

[Technical field]

[0001] The present invention relates to a winding shaft mounting structure for an electric shutter device. [Background technology]

[0002] Some electric shutter devices have an electric motor built into the winding shaft. In this type of electric shutter device, a shaft bracket is provided on one side plate of the shutter case, and a case bracket is provided on the other side plate, and the winding shaft is attached between the side plates via these brackets (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-138754 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, when a malfunction occurs in the electric motor of the electric shutter device, it is preferable to deal with it by replacing only the winding shaft including the electric motor. However, since a considerable amount of time has passed since the installation of the electric shutter device, it is possible that the supply of the electric motor that needs to be replaced has already ended. In such a situation, it is possible to deal with it by replacing it with an electric motor of a different model or an electric motor of a different manufacturer. However, if the model of the electric motor or the manufacturer is different, the case bracket already installed on the side plate and the motor case often do not match. Ultimately, even if a malfunction occurs only in the electric motor, it is necessary to replace the entire electric shutter device including the shutter case, which causes problems such as a large repair cost.

[0005] SUMMARY OF THE PRESENT EMBODIMENT In view of the above-mentioned circumstances, an object of the present invention is to provide a winding shaft mounting structure for an electric shutter device that can reduce repair costs when a malfunction occurs in the electric motor. [Means for solving the problem]

[0006] In order to achieve the above object, the mounting structure for a resin part according to the present invention is a winding shaft mounting structure for an electric shutter device for mounting the other end of a winding shaft having a shaft at one end and a motor case at the other end to a side plate of a shutter case provided with a case bracket having a plurality of protrusions, and an adapter having a case mounting portion attached to the motor case and a bracket mounting portion that engages with the protrusions of the case bracket is interposed between the motor case and the case bracket. The projections of the case bracket are provided at positions spaced apart from one another on the same circumference, and the bracket mounting portion of the adapter is provided with an engagement wall portion that can be inserted between the projections and that, when inserted between the projections, engages with the projections to restrict relative rotation in a direction along the circumference with respect to the case bracket. It is characterized by the fact that Effect of the Invention

[0007] According to the present invention, by interposing an adapter between the case bracket attached to the side panel and the motor case, it becomes possible to attach the winding shaft to the shutter case of an existing electric shutter device in its current state, thereby making it possible to reduce repair costs in the event of a malfunction in the electric motor. [Brief description of the drawings]

[0008] [Figure 1] 1 is a vertical cross-sectional view of an electric shutter device to which a winding shaft mounting structure according to an embodiment of the present invention is applied. [Diagram 2] 2 is an exploded perspective view of the electric shutter device shown in FIG. 1, seen from the outside of the room. [Diagram 3] This shows a shutter case to be applied to the electric shutter device shown in Figure 1, where (a) is an external oblique view, (b) is an oblique view showing one of the side panels that make up the shutter case, and (c) is an oblique view showing the other side panel that makes up the shutter case. [Figure 4]2A shows the components of the electric shutter device shown in FIG. 1, and FIG. 2B is an enlarged perspective view of the main part of the motor case which is one end of the winding shaft. [Diagram 5] 2 is a plan view of a main portion showing a connection portion between a side plate and a shaft of a winding shaft in the electric shutter device shown in FIG. 1. [Figure 6] 2 is an enlarged view showing an end face of a motor case in a winding shaft applied to the electric shutter device shown in FIG. [Figure 7] This shows the connection between the side panel and the motor case of the winding shaft in the electric shutter device shown in Figure 1, where (a) is an oblique view of the main part as seen from the outside of the room with the slat guide omitted, and (b) is an oblique view of the main part as seen from the building side with the slat guide omitted. [Figure 8] 2 is a perspective view of a connection portion between a side plate and a motor case of a winding shaft in the electric shutter device shown in FIG. 1, as viewed from the outside of the room. FIG. [Figure 9] 2 is a view of a side plate to which a motor case of a winding shaft is connected in the electric shutter device shown in FIG. 1, as viewed from the inner surface side. [Figure 10] 2A shows the winding shaft and adapter of the electric shutter device shown in FIG. 1, where FIG. 2A is an exploded oblique view of the main parts of the motor case of the winding shaft and the adapter, and FIG. 2B is an oblique view of the main parts with the adapter fitted into the motor case of the winding shaft. [Figure 11] This shows an existing shutter case that was applied to an existing electric shutter device, where (a) is an external oblique view, (b) is an oblique view showing one of the existing side panels that make up the existing shutter case, and (c) is an oblique view showing the other existing side panel that makes up the existing shutter case. [Figure 12] This shows the relationship between the bracket for the existing case that was attached to the existing shutter case and the adapter, where (a) is a view of the bracket for the existing case from the inner surface side of the side plate, (b) is a view of the adapter from the inner surface side of the side plate, and (c) is a view of the adapter engaged with the bracket for the existing case from the inner surface side of the side plate. [Figure 13]2 is a cross-sectional view of a main portion of the electric shutter device shown in FIG. 1 in a state where an adapter is fitted into a fitting portion provided on a motor case of a winding shaft. [Figure 14] This shows the existing side panel and winding shaft of the existing shutter case shown in Figure 11, where (a) is an exploded oblique view and (b) is an oblique view of the state where the winding shaft is attached to the bracket for the existing case of the existing side panel. [Figure 15] This shows the existing side panel of the existing shutter case shown in Figure 11 and an adapter to be attached to the motor case of the winding shaft, where (a) is an exploded oblique view and (b) is an oblique view of the adapter attached to the bracket for the existing case of the existing side panel. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] A preferred embodiment of the winding shaft mounting structure of the electric shutter device according to the present invention will be described in detail below with reference to the attached drawings. In the following, for convenience, the terms "prospect direction" and "finding direction" may be used. The "prospect direction" is the direction along the depth of the electric shutter device, as shown by arrow A in the figure. A surface along the prospect direction may be called a "prospect surface." The "finding direction" is a direction along the top and bottom perpendicular to the prospect direction in the case of an object that extends along the horizontal direction, such as an upper frame. In the case of an object that extends along the vertical direction, such as a vertical frame, the direction along the horizontal direction perpendicular to the prospect direction is called the "finding direction." A surface along the prospect direction may be called a "finding surface."

[0010] 1 and 2 show an electric shutter device to which a winding shaft mounting structure according to an embodiment of the present invention is applied. The electric shutter device exemplified here is attached to the upper part of a frame 10 of a fitting such as a sliding window. A shutter box 20 is configured in a portion of the frame 10 of the fitting to which the electric shutter device is attached that is above the upper frame 11. The shutter box 20 is for housing and supporting the electric shutter device, and is configured in a horizontally elongated rectangular parallelepiped shape by extending the upper ends of the left and right vertical frames 12 above the upper frame 11 and installing a roof plate 21 between the upper ends of the extended vertical frames 12.

[0011] The electric shutter device arranged in the shutter box 20 described above winds and unwinds the shutter curtain 32 around the winding shaft 31 provided in the shutter case 30. As shown in Figs. 1 to 3, the shutter case 30 is configured by providing side plates 34 on both sides of the back plate 33 so as to face each other. The upper side and the outdoor side portion between the left and right side plates 34 in the shutter case 30 are detachably covered by a front cover 35a. A shaft bracket 36 for supporting the winding shaft 31 is attached to the opposing portions of the side plates 34. The winding shaft 31 incorporates an electric motor 37 and its control unit 38, and rotatably supports a winding roll 39 on its outer periphery, and can rotate the winding roll 39 in both directions relative to each other by driving the electric motor 37. The control unit 38 controls the rotation direction and rotation speed of the electric motor 37 based on commands given from a remote control or indoor terminal device (not shown) described later.

[0012] In this embodiment, as shown in Fig. 4, a winding shaft 31 is applied in which a cylindrical shaft 31a protrudes from one end of a winding roll 39 and a resin columnar motor case 31b protrudes from the other end, and the winding shaft 31 is attached between the left and right side plates 34 by connecting the shaft 31a and the motor case 31b to a shaft bracket 36. More specifically, the shaft bracket 36 is originally intended to support the shaft 31a, and as shown in Fig. 3(b) and Fig. 3(c), each of the shaft brackets 36 is configured to have a horizontal bottom wall 36a, two side walls 36b provided on both sides of the horizontal bottom wall 36a, and a mounting wall 36c provided so as to bend from each side wall 36b in a direction substantially perpendicular to the horizontal bottom wall 36a. The shaft bracket 36 is attached to the side plate 34 at a substantially central portion of the inner surface 34a via the mounting wall 36c with the support opening 36d between the side wall portions 36b opening obliquely upward toward the outside. The shaft bracket 36 may be attached to the side plate 34 by spot welding or the like, or by screws. The distance between the two side wall portions 36b is formed to a dimension capable of accommodating the shaft 31a of the winding shaft 31. As shown in FIG. 5, the shaft 31a of the winding shaft 31 can be detachably attached to the shaft bracket 36 by passing a connecting pin 36e through the side wall portions 36b and the shaft 31a with the shaft 31a disposed between the horizontal bottom wall portion 36a and the two side wall portions 36b.

[0013] On the other hand, as shown in FIG. 4(b), the motor case 31b of the winding shaft 31 is provided with a fitting portion 40 that opens on the end face and the circumferential face. The fitting portion 40 is concave and has two abutment surfaces 41 that face each other with a mutual distance substantially equal to the width of the two side wall portions 36b of the shaft bracket 36, a closed end surface 42 that is provided to connect one end of each abutment surface 41, and two open edge surfaces 43 that extend in a direction away from each other from the other end edge of each abutment surface 41. As shown in FIG. 6, a relief portion 44 is provided at each of the meeting portions that are the inside corners of the abutment surface 41 and the closed end surface 42. The relief portion 44 is formed to be concave and prevents the abutment surface 41 and the closed end surface 42 from directly contacting each other. 6 and 7, the motor case 31b having the fitting portion 40 can be fitted to the shaft bracket 36 with the side wall portions 36b of the shaft bracket 36 abutting against the two abutment surfaces 41, respectively, and with the end faces of the side wall portions 36b abutting against the closed end surface 42. Furthermore, by passing the connecting pin 36f through the motor case 31b and the side wall portions 36b, the motor case 31b can be detachably attached to the shaft bracket 36.

[0014] Further, a cable insertion hole 51 and a wire insertion hole 52 are provided on the end face of the motor case 31b. As shown in Fig. 9, the cable insertion hole 51 is provided for inserting cables such as a power cable 61 and its connector 61a for supplying power to the electric motor 37 and the control unit 38 built in the winding shaft 31, and a terminal communication cable 62 for connecting an external device such as an indoor terminal device to the control unit 38, into and out of the motor case 31b, and a plurality of cable insertion holes are provided on the periphery of the motor case 31b. The wire insertion hole 52 is provided for inserting an operation wire 63, which is pulled when the braked state of the winding roll 39 relative to the winding shaft 31 is released to manually operate the shutter curtain 32, into and out of the motor case 31b, and is the only one provided in the substantially central part of the motor case 31b.

[0015] As shown in FIG. 1, the shutter curtain 32 is formed by connecting a plurality of slats 32a to each other, and one end of the shutter curtain 32 is connected to the winding roll 39. When the winding roll 39 rotates around the winding shaft 31 by the driving of the electric motor 37, the shutter curtain 32 can be wound and unwound around the winding roll 39. As shown in FIG. 1 and FIG. 2, the left and right vertical frames 12 are provided with guide rails 13 on the outside of the room. The shutter curtain 32 unwound from the winding roll 39 has both edges inserted into the guide rails 13, and can close the opening of the frame body 10. As shown in FIG. 1, a winding space 32A is provided between the outer circumferential surface of the winding roll 39 and the back plate 33 and the front cover 35a so that the shutter curtain 32 does not come into contact with the back plate 33 and the front cover 35a even when the shutter curtain 32 is completely wound around the winding roll 39. In addition, a larger mutual gap is secured between the side plates 34 of the shutter case 30 than between the shutter curtains 32, and the shutter curtain 32 wound up on the winding roll 39 does not come into contact with the inner surface 34a of the side plate 34. Note that reference numeral 35b in Fig. 2 denotes a side cover that covers the outer surface of the part of the side plate 34 that protrudes outside the room beyond the vertical frame 12.

[0016] As shown in Fig. 8, one side plate 34 (the right side plate when viewed from the outside in this embodiment) supporting the motor case 31b has three slat guides 70A, 70B, 70C arranged in parallel in the circumferential direction on the inner surface 34a facing the other side plate 34 so as to surround the winding shaft 31. These slat guides 70A, 70B, 70C are arranged in the gap between the shutter curtain 32 and the side plate 34 to form a storage space (not shown) between the side plate 34 and the slat guides 70A, 70B, 70C. As shown in Fig. 9, these storage spaces accommodate the power cable 61 and its connector 61a and the terminal communication cable 62 drawn out from the cable insertion hole 51 of the motor case 31b to the outside, as well as the intermediate portion of the above-mentioned operation wire 63. The slat guide 70B on the outside of the room accommodates electronic components 64 such as communication devices for connecting the control unit 38 to external devices such as a remote control and indoor terminal devices.

[0017] In the electric shutter device configured as described above, when an operation is performed from inside the building through a remote control or an indoor terminal device (not shown), the electric motor 37 rotates in a direction and at a rotation speed according to the operation through the electronic parts 64 and the control unit 38. This causes the shutter curtain 32 to be wound and unwound around the winding roll 39 of the winding shaft 31, and the opening of the frame body 10 is appropriately opened and closed. During these operations, the shutter curtain 32 moves inside the shutter case 30. However, the power cable 61, the terminal communication cable 62, the operation wire 63, and the electronic parts 64 are all arranged in the storage space between the slat guides 70A, 70B, and 70C and the side plate 34. Therefore, there is no concern that the shutter curtain 32 will come into contact with these cables 61 and 62, the operation wire 63, and the electronic parts 64.

[0018] In addition, the same shaft bracket 36 can be used for the shaft 31a of the winding shaft 31 and the motor case 31b, so the number of parts does not increase, which is advantageous in terms of manufacturing costs. Moreover, since the fitting portion 40 of the motor case 31b and the shaft bracket 36 are fitted together, the winding shaft 31 and the side plate 34 can be attached more firmly, which is also advantageous in terms of durability. Furthermore, the fitting portion 40 has a relief portion 44 at the meeting portion where the contact surface 41 and the closed end surface 42 meet, which is an inside corner of the fitting portion 40. Therefore, although the side wall portion 36b of the shaft bracket 36 is pressed against the contact surface 41 as the winding shaft 31 and the winding roll 39 rotate relative to each other, stress is prevented from concentrating at the meeting portion between the contact surface 41 and the closed end surface 42. As a result, there is no risk of damage to the motor case 31b even if the electric shutter device is used for a long period of time.

[0019] As shown in Fig. 10, an adapter 80 is prepared for this electric shutter device. As shown in Fig. 11, the adapter 80 is required when replacing the winding shaft 31 described above with a shutter case 130 of an existing electric shutter device having a case bracket 136 attached to one side plate 134. A shaft bracket for supporting the shaft 31a, for example, the same shaft bracket 36 as in the above-mentioned electric shutter device, is attached to the other side plate 134 of the shutter case 130. In the following, the components of the existing electric shutter device will also be described as necessary, but in order to clarify the differences from the components of the above-mentioned electric shutter device, the term "existing" may be used to refer to the components of the existing electric shutter device.

[0020] The bracket 136 for the existing case is a dedicated one used when mounting an existing motor case of an existing winding shaft (not shown) to be replaced to the existing side plate 134, and as shown in Figs. 11 and 12, it is substantially circular and has projections 136a at multiple positions (six positions in this embodiment) that are equally spaced from one another on the same circumference on the periphery. The projections 136a are substantially semicircular cylindrical shapes formed to be convex toward the center of the disk, and protrude in a direction that is substantially perpendicular to the inner surface 134a of the existing side plate 134. At the periphery of the bracket 136 for the existing case between the projections 136a, peripheral walls 136b are provided so as to protrude in the same direction as the projections 136a. The projection dimension of the peripheral wall 136b is about half the projection dimension of the projections 136a.

[0021] As shown in FIG. 10, the adapter 80 is formed by integrally molding a case mounting portion 81 that can be fitted into the fitting portion 40 of the motor case 31b and a bracket mounting portion 82 that can be engaged with the existing case bracket 136. The case mounting portion 81 is configured to have a rectangular base wall portion 81a and two side wall portions 81b that extend substantially parallel to each other in the same direction from both side edges of the base wall portion 81a. As shown in FIG. 13, the two side wall portions 81b are formed so that they abut against the two abutment surfaces 41 when placed in the fitting portion 40 of the motor case 31b and their extended ends protrude from the end faces of the motor case 31b. A wire insertion notch 81c is formed in the portion of the base wall portion 81a that faces the wire insertion hole 52 of the motor case 31b. As shown in Fig. 10 to Fig. 12, the bracket mounting portion 82 is configured by providing two engaging walls 82a extending from each side wall 81b in a manner substantially parallel to the base wall 81a and bending in a direction away from each other. The two engaging walls 82a have engaging notches 82b at their respective tips, and can be inserted between the two opposing protrusions 136a with these engaging notches 82b engaged with the circumferential surface of the protrusion 136a provided on the bracket for existing case 136 and with the tips engaged with the inner circumferential surface of the circumferential wall 136b. To mount the adapter 80 to the motor case 31b, a connecting pin (not shown) is inserted through the motor case 31b and the side wall 81b with the case mounting portion 81 fitted into the fitting portion 40.

[0022] As shown in Figures 14 and 15, the winding shaft 31 with the above-mentioned adapter 80 attached to the motor case 31b is attached between the existing side plates 134 in a state where relative movement with respect to the existing shutter case 130 is restricted by engaging the bracket attachment portion 82 of the adapter 80 with the bracket 136 for the existing case, and attaching the shaft 31a at the other end to the bracket 36 for the existing shaft from this state. Therefore, if a problem occurs only in the existing electric motor of the existing electric shutter device, it is possible to deal with it by applying the above-mentioned adapter 80 and replacing only the existing winding shaft including the existing electric motor with the above-mentioned winding shaft 31, and it is possible to suppress repair costs by applying it to the existing shutter case 130 as it is.

[0023] In the above embodiment, the motor case 31b is provided with the fitting portion 40 into which the shaft bracket 36 can be fitted, so that the shaft bracket 36 can also be used when attaching the motor case 31b to the side plate 34, and it is only necessary to provide the shaft bracket 36 on both side plates 34. This not only makes the manufacturing process extremely easy, but also reduces manufacturing costs by sharing parts. However, the motor case 31b does not need to have the fitting portion 40 into which the shaft bracket 36 can be fitted, and it does not necessarily need to be concave. For example, the case mounting portion of the adapter may be configured to be attached so as to sandwich the motor case. Furthermore, in the above-described embodiment, when a concave mating portion 40 is provided, a recess 44 is provided so as to be concave at the meeting portion between the closed end face 42 and the abutment surface 41. Therefore, even when the electric motor 37 is driven with the shaft bracket 36 or the adapter 80 engaged, damage to the motor case 31b caused by stress concentration at the meeting portion between the closed end face 42 and the abutment surface 41 can be prevented, but the present invention is not necessarily limited to this.

[0024] As described above, the winding shaft mounting structure of an electric shutter device according to the present invention is a winding shaft mounting structure for an electric shutter device for mounting the other end of a winding shaft having a shaft at one end and a motor case at the other end to a side panel of a shutter case having a case bracket having a plurality of protrusions, and is characterized in that an adapter having a case mounting portion attached to the motor case and a bracket mounting portion that engages with the protrusion of the case bracket is interposed between the motor case and the case bracket. According to this invention, by interposing an adapter between the case bracket attached to the side panel and the motor case, it is possible to attach the winding shaft to the shutter case of an existing electric shutter device in its current state, which makes it possible to reduce repair costs in the event of a malfunction in the electric motor.

[0025] The present invention is also characterized in that, in the winding shaft mounting structure of the above-mentioned electric shutter device, the motor case is provided with an engagement portion into which a shaft bracket for supporting the shaft can be fitted, and the case mounting portion of the adapter has a shape that allows it to be fitted into the engagement portion. According to this invention, a shaft bracket can be applied when attaching the motor case to the side plate, so that when attaching the winding shaft to the shutter case, it is sufficient to attach a shaft bracket to each side plate, which not only makes manufacturing work extremely easy but also makes it possible to reduce manufacturing costs by sharing parts.

[0026] The present invention is also characterized in that, in the winding shaft mounting structure of the electric shutter device described above, the protrusions of the case bracket are provided at positions on the same circumference that are spaced apart from each other, and the bracket mounting portion of the adapter is provided with an engagement wall portion that can be inserted between the multiple protrusions and, when inserted between the multiple protrusions, engages with the protrusions to regulate relative rotation in a direction along the circumference with respect to the case bracket. According to this invention, by simply inserting the bracket mounting portion of the adapter between the multiple protrusions with the adapter already attached to the motor case, it is possible to restrict the relative rotation of the winding shaft with respect to the side plate, which is advantageous in terms of operability when attaching the motor case to the case bracket on the side plate.

[0027] The present invention is also characterized in that, in the winding shaft mounting structure of the electric shutter device described above, the case mounting portion of the adapter has a rectangular base wall portion and two side wall portions extending in the same direction from both side edges of the base wall portion, the bracket mounting portion of the adapter has two engaging wall portions extending in directions away from each other from the extending edges of the two side wall portions, and each engaging wall portion is provided with an engaging notch portion for engaging with a protrusion of the case bracket, the fitting portion of the motor case has two opposing abutment surfaces that abut against the outer surfaces of the two side wall portions, and forms a concave shape into which the adapter is fitted between the two abutment surfaces, one end of the case mounting portion opens to the circumferential surface of the motor case while the other end is closed, and the meeting portion between the closed end face of the fitting portion and the abutment surfaces is provided with a relief portion so as to be concave. According to this invention, since the motor case and the adapter are joined via the two side walls, a large joining area can be secured, which is advantageous in terms of strength. Moreover, since the motor case has relief portions at both corners of the closed end face, it is possible to prevent damage to the motor case due to stress concentration. [Explanation of symbols]

[0028] 30 shutter case, 31 winding shaft, 31a shaft, 31b motor case, 34 side plate, 34a inner surface, 36 shaft bracket, 37 electric motor, 40 fitting portion, 41 abutment surface, 42 closed end surface, 44 escape portion, 80 adapter, 81 case mounting portion, 81a base wall portion, 81b side wall portion, 82 bracket mounting portion, 82a engagement wall portion, 82b engagement cutout portion, 130 existing shutter case, 134 existing side plate, 136 existing case bracket, 136a protrusion

Claims

1. A winding shaft mounting structure for an electric shutter device for mounting a winding shaft having a shaft at one end and a motor case at the other end to a side plate of a shutter case provided with a case bracket having a plurality of protrusions, an adapter is interposed between the motor case and the case bracket, the adapter having a case mounting portion attached to the motor case and a bracket mounting portion that engages with a protrusion of the case bracket; the projections of the bracket for a case are provided at positions spaced apart from each other on the same circumference, A winding shaft mounting structure for an electric shutter device, characterized in that the bracket mounting portion of the adapter is provided with an engagement wall portion that can be inserted between the multiple protrusions and that, when inserted between the multiple protrusions, engages with the protrusions to regulate relative rotation in the direction along the circumference with respect to the case bracket.

2. A winding shaft mounting structure for an electric shutter device for mounting a winding shaft having a shaft at one end and a motor case at the other end to a side plate of a shutter case provided with a case bracket having a plurality of protrusions, an adapter is interposed between the motor case and the case bracket, the adapter having a case mounting portion attached to the motor case and a bracket mounting portion that engages with a protrusion of the case bracket; the motor case is provided with a fitting portion into which a shaft bracket for supporting the shaft can be fitted, the case mounting portion of the adapter has a rectangular base wall portion and two side walls extending in the same direction from both side edges of the base wall portion, and is configured in a shape that can be fitted into the fitting portion; the bracket attachment portion of the adapter has an engagement wall portion provided with an engagement notch portion that engages with the protrusion of the case bracket, the fitting portion of the motor case has two opposing abutment surfaces that abut against outer surfaces of the two side wall portions, and forms a recess between the two abutment surfaces into which the adapter is fitted, the case mounting portion has one end that opens to a peripheral surface of the motor case and the other end that is closed; A winding shaft mounting structure for an electric shutter device, characterized in that a recess is provided at the meeting portion between the closed end face of the fitting portion and the abutment surface so as to be concave.

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