Front end connecting structure of curtain driver and electric curtain

Abstract

The utility model discloses a front end connecting structure of a curtain driver and an electric curtain, the front end connecting structure is applied between the curtain driver and a transmission case, the front end connecting structure comprises a horizontal meshing part and a convex edge which are correspondingly arranged, in the curtain driver and the transmission case, one is provided with the horizontal meshing part, and the other is provided with the convex edge. The horizontal meshing part comprises a vertical wall and a vertical groove body defined by the vertical wall, and the protruding edge extends into the vertical groove body so that the curtain driver can be fixed to the transmission box in one or more directions on the horizontal plane. The front end connecting structure can offset the counter-acting force of the gear of the transmission case to a large extent in the horizontal direction, the installation stability of the curtain driver is guaranteed, meanwhile, the corresponding structure of the curtain driver and the transmission case is simplified, and the installation convenience of the curtain driver is improved.

Description

Technical Field

[0001] The utility model relates to the field of smart home, in particular to a front end connection structure of a curtain driver and an electric curtain. Background Art

[0002] Current electric curtains usually include transmission boxes located on both sides of the curtains, and a curtain driver installed on one of the transmission boxes. The curtain driver drives a belt in the curtain to rotate through the transmission box to drive the curtain to open and close.

[0003] Since the existing curtain drive is installed independently relative to the transmission box, the gears in the transmission box will generate a large reverse force when driving the curtain to open and close. This reverse force will affect the structural stability of the curtain drive to a certain extent. Based on this, the current curtain drive requires a complex connection structure with screws to achieve installation relative to the transmission box, which will increase production costs and make disassembly and assembly of the curtain drive inconvenient. Utility Model Content

[0004] The utility model provides a front end connection structure of a curtain driver and an electric curtain, which are used to solve the problem that the existing curtain driver is subjected to a large reverse force from a transmission box gear, resulting in a complex curtain driver structure, high production cost and inconvenient assembly and disassembly.

[0005] On the one hand, an embodiment of the utility model provides a front-end connection structure of a curtain drive, which is applied between the curtain drive and a transmission box. The front-end connection structure includes correspondingly arranged horizontal bite parts and convex edges. In the curtain drive and the transmission box, one is provided with a horizontal bite part, and the other is provided with a convex edge. The horizontal bite part includes a vertical wall and a vertical groove body surrounded by the vertical wall. The convex edge extends into the vertical groove body to fix the curtain drive to the transmission box in one or more directions on the horizontal plane.

[0006] Furthermore, the convex edge extends into the vertical groove in the vertical direction, so that the curtain driver can be detachably fixed on the transmission box in the vertical direction.

[0007] Furthermore, the number of the horizontal bite parts and the convex edges is two pairs, and the opening directions of the notches of the vertical groove bodies of the two horizontal bite parts are opposite.

[0008] Further, the horizontal engaging portion includes a convex groove, which includes an inner vertical wall formed on the side wall of the curtain drive or the transmission box, a middle vertical wall formed by extending outward from the inner vertical wall, and an outer vertical wall formed by extending from the end of the middle vertical wall, and the inner vertical wall, the middle vertical wall and the outer vertical wall together form a vertical groove body.

[0009] Furthermore, the convex edge is a column formed on the side wall of the curtain drive or the transmission box, or the convex edge is an outer vertical wall of the convex groove.

[0010] Furthermore, the horizontal engaging portion is arranged on the curtain driver, including a first convex groove and a second convex groove, the convex edge is arranged on the transmission box, including a column and an outer vertical wall of the third convex groove, the first convex groove is arranged corresponding to the third convex groove, and the second convex groove is arranged corresponding to the column.

[0011] Furthermore, the cross-sectional areas of the vertical groove bodies of the first convex groove and the second convex groove gradually increase in the vertical direction from bottom to top, and transition surfaces are also provided at the bottom ends of the upright column and the third convex groove.

[0012] Furthermore, the front end connection structure includes a groove formed on the bottom surface of the transmission box, the opening of the groove is set downward, the third convex groove is formed on the front edge of the groove, and the column is formed on the rear edge of the groove.

[0013] Furthermore, the front connection structure further comprises a wing plate horizontally arranged on the curtain drive, the wing plate extending outwardly from the side wall surface of the curtain drive, the first convex groove is formed at the head of the wing plate, and the second convex groove is formed at the tail of the wing plate;

[0014] The groove also includes a lateral opening facing the curtain transmission box. When the outer vertical wall of the third convex groove extends into the vertical groove body of the first convex groove in the vertical direction, and the column extends into the vertical groove body of the second convex groove in the vertical direction, the curtain drive is fixed to the transmission box in the vertical direction, and the wing plate extends into the transmission box groove through the lateral opening and is placed on the groove surface of the transmission box groove.

[0015] Furthermore, the front end connection structure further comprises an elastic ejector disposed above the groove surface of the transmission box groove, and the wing plate comprises a stopper located at the rear portion, the stopper is used to cooperate with the elastic ejector of the transmission box, and comprises a guide surface and a placement surface;

[0016] When the outer vertical wall of the third convex groove extends into the vertical groove body of the first convex groove in the vertical direction, and the column extends into the vertical groove body of the second convex groove in the vertical direction, the curtain drive is fixed to the transmission box in the vertical direction, and the placement surface supports the elastic ejector.

[0017] Furthermore, the elastic ejector includes a slide groove formed on the groove surface, an ejector body located in the slide groove, and a compression spring. The compression spring is arranged between the bottom of the slide groove and the ejector body, so that the ejector body can slide relative to the slide groove and reset under the action of the compression spring.

[0018] Furthermore, the first convex grooves, the second convex grooves and the wing plates are each in two pairs, the two pairs of the first convex grooves are symmetrically arranged on the driver, and the two pairs of the wing plates are symmetrically arranged on the driver.

[0019] On the other hand, an embodiment of the utility model further provides an electric curtain, including a curtain driver and a transmission box, wherein the curtain driver and the transmission box are provided with a front end connection structure of any of the above-mentioned curtain drivers.

[0020] Furthermore, the curtain driver includes an output gear driven by a motor, and the transmission box includes an input gear for driving a curtain belt. The output gear and the input gear are arranged horizontally. When the convex edge extends into the vertical groove in the vertical direction to complete the fixation of the curtain driver to the transmission box in the vertical direction, the output gear of the curtain driver meshes with the input gear of the transmission box.

[0021] The embodiment of the utility model is provided with a front-end connection structure on the curtain drive and the transmission box, and the front-end connection structure includes a correspondingly arranged horizontal bite portion and a convex edge, the horizontal bite portion includes a vertical wall and a vertical groove body surrounded by the vertical wall, and the convex edge extends into the vertical groove body, so that the curtain drive of the embodiment of the utility model meets the condition of being installed relative to the transmission box in the vertical direction. When the curtain drive is installed on the transmission box, the convex edge is located in the vertical groove body, and the vertical wall of the horizontal bite portion fixes the curtain drive in one or more directions on the horizontal plane. Since the reaction force of the gear in the transmission box is also located in the horizontal direction, the horizontal bite portion and the convex edge of the embodiment of the utility model can offset the reaction force to a large extent in the horizontal direction, thereby improving the installation stability of the curtain drive, and can effectively avoid the problems of complex structure, high production cost, and inconvenient disassembly and assembly caused by the installation of complex structure with screws, simplifying the corresponding structure of the curtain drive and the transmission box, and ensuring the convenience of installation of the curtain drive. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 It is a partial view of the curtain of the second embodiment of the utility model from a bottom-up perspective, in which the curtain drive is not installed on the transmission box, and the figure shows the front end connection structure of the curtain drive of the second embodiment of the utility model;

[0024] Figure 2 yes Figure 1Another partial view from below of the curtain drive mounted on the transmission box, with the transmission box cover hidden;

[0025] Figure 3 yes Figure 2 A perspective view of the middle drive housing and the transmission case housing when they are in an installed state, viewed from above;

[0026] Figure 4 yes Figure 3 A perspective view from a bottom perspective when the middle driver housing and the transmission case housing are in a separated state;

[0027] Figure 5 yes Figure 4 A three-dimensional diagram from a top-down perspective;

[0028] Figure 6 yes Figure 1 A cross-sectional view of the curtain drive installed on the transmission box, the cross section is a vertical plane and the cutting position is located at the elastic ejector;

[0029] Figure 7 It is a partial view of the curtain of the third embodiment of the utility model from an upward perspective, and the curtain drive is in a state where it is not installed on the transmission box;

[0030] Figure 8 yes Figure 7 Another partial view from below of the curtain drive mounted on the transmission housing, with the transmission housing cover hidden. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0032] When the embodiments of the present invention mention ordinal numbers such as "first" and "second", unless they do express the meaning of order according to the context, they should be understood as being used only for distinction. When the present application refers to A and B being symmetrically arranged on C, it includes the case where A and B are directly arranged on C, and also includes the case where A and B are arranged on C through other components. The symmetrical arrangement referred to in the present application includes but is not limited to axisymmetry, plane symmetry and mirror symmetry.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] First embodiment:

[0035] The present embodiment provides a front-end connection structure of a curtain drive, which is applied between the curtain drive and a transmission box. The front-end connection structure includes correspondingly arranged horizontal bite portions and convex edges. In the curtain drive and the transmission box, one is provided with a horizontal bite portion, and the other is provided with a convex edge. The horizontal bite portion includes a vertical wall and a vertical groove body surrounded by the vertical wall. The convex edge extends into the vertical groove body to fix the curtain drive to the transmission box in one or more directions on a horizontal plane.

[0036] In this embodiment, the horizontal bite portion and the convex edge correspond to each other one by one, and the number of the horizontal bite portion and the convex edge is multiple. The horizontal bite portion includes a countersunk hole arranged on the transmission box, a vertical groove body is formed in the middle of the countersunk hole, and the surrounding wall of the vertical groove body forms a vertical vertical wall. The convex edge is a column arranged on the curtain driver corresponding to the countersunk hole, and the convex edge extends into the vertical groove body in the vertical direction, so that the curtain driver can be detachably fixed on the transmission box in the vertical direction.

[0037] As a specific solution but not limitation, the front connection structure also includes a horizontal latch member arranged between the curtain drive and the transmission box, and the horizontal latch member is used to provide vertical support force for the curtain drive when the column is inserted into the countersunk hole.

[0038] The embodiment of the utility model is provided with a front-end connection structure on the curtain drive and the transmission box, and the front-end connection structure includes a correspondingly arranged horizontal bite portion and a convex edge, the horizontal bite portion includes a vertical wall and a vertical groove body surrounded by the vertical wall, and the convex edge extends into the vertical groove body, so that the curtain drive of the embodiment of the utility model meets the condition of being installed relative to the transmission box in the vertical direction. When the curtain drive is installed on the transmission box, the convex edge is located in the vertical groove body, and the vertical wall of the horizontal bite portion fixes the curtain drive in one or more directions on the horizontal plane. Since the reaction force of the gear in the transmission box is also located in the horizontal direction, the horizontal bite portion and the convex edge of the embodiment of the utility model can offset the reaction force to a large extent in the horizontal direction, thereby improving the installation stability of the curtain drive, and can effectively avoid the problems of complex structure, high production cost, and inconvenient disassembly and assembly caused by the installation of complex structure with screws, simplifying the corresponding structure of the curtain drive and the transmission box, and ensuring the convenience of installation of the curtain drive.

[0039] Second embodiment:

[0040] Please refer to Figure 1 As shown in the figure, this embodiment provides a front-end connection structure of a curtain drive, which is applied between the curtain drive and the transmission box. The front-end connection structure includes correspondingly arranged horizontal bite parts and convex edges. In the curtain drive and the transmission box, the horizontal bite part is arranged on the driver, and the convex edge is arranged on the transmission box. The horizontal bite part includes a vertical wall and a vertical groove body 4 formed by the vertical wall. The convex edge extends into the vertical groove body 4 to fix the curtain drive to the transmission box in one or more directions on the horizontal plane.

[0041] In this embodiment, the curtain drive includes a drive housing 1, and the transmission box includes a transmission box housing 2 and a transmission box cover 21. The protrusion extends into the vertical groove in the vertical direction so that the curtain drive can be detachably fixed to the transmission box in the vertical direction.

[0042] In this embodiment, the number of the horizontal bite parts and the convex edges is two pairs, and the opening directions of the notches of the vertical grooves of the two horizontal bite parts are opposite. As a specific implementation scheme of the opposite opening directions, the notches of the vertical grooves of the two horizontal bite parts can be arranged opposite to each other, or arranged back to back. In this embodiment, the notches of the vertical grooves of the two horizontal bite parts are arranged opposite to each other. The vertical grooves with opposite openings can form a clamping force in the opening direction, thereby improving the structural stability between the horizontal bite parts.

[0043] In this embodiment, the horizontal bite portion includes a convex and concave groove, which includes an inner vertical wall formed on the side wall of the drive housing, a middle vertical wall formed by extending outward based on the inner vertical wall, and an outer vertical wall formed by extending from the end of the middle vertical wall. The inner vertical wall, the middle vertical wall and the outer vertical wall together form a vertical groove body.

[0044] It should be noted that in some solutions of other embodiments, the inner vertical wall can be designed integrally with the side wall of the driver housing or the transmission box housing. The evolution and replacement based on the above description all belong to the protection scope of the present utility model.

[0045] The convex edge is a column 3 formed on the side wall of the transmission box housing 2, or the convex edge is an outer vertical wall of the convex groove.

[0046] As a specific solution but not limitation, the horizontal engaging portion is arranged on the driver housing 1, including a first convex groove 4 and a second convex groove 5, and the convex edge is arranged on the transmission box housing 2, including an outer vertical wall 61 of a column 3 and a third convex groove 6, the first convex groove 4 is arranged corresponding to the third convex groove 6, and the second convex groove 5 is arranged corresponding to the column 3, and the cross-sectional area of ​​the vertical groove body of the first convex groove 4 and the second convex groove 5 gradually increases in the vertical direction from bottom to top, and a transition surface is also provided at the bottom end of the column 3 and the third convex groove 6.

[0047] As a specific solution but not limitation, the front end connection structure includes a groove 7 formed on the bottom surface of the transmission box housing 2, the opening of the groove 7 is set downward, the head edge of the groove 7 is formed with the third convex groove 6, and the tail edge of the groove 7 is formed with the column 3.

[0048] As a preferred solution but not a limitation, the front connection structure further includes a wing plate 8 horizontally arranged on the driver housing 1, the wing plate 8 extends outward from the side wall surface of the driver housing 1, the first convex groove 4 is formed at the head of the wing plate 8, and the second convex groove 5 is formed at the tail of the wing plate 8;

[0049] The groove 7 also includes a lateral opening 71 facing the curtain transmission box. When the outer vertical wall 61 of the third convex groove 6 extends into the vertical groove body 41 of the first convex groove 4 in the vertical direction, and the column 3 extends into the vertical groove body 51 of the second convex groove 5 in the vertical direction, the curtain drive is fixed to the transmission box in the vertical direction, and the wing plate 8 extends into the groove 7 of the transmission box housing through the lateral opening 71 and rests on the groove surface 72 of the transmission box housing groove.

[0050] As a preferred solution but not a limitation, the front end connection structure further includes an elastic ejector 9 disposed above the groove surface 72 of the transmission case housing groove, and the wing plate 8 includes a stopper 10 located at the rear, the stopper 10 is used to cooperate with the elastic ejector 9 of the transmission case, and includes a guide surface 101 and a placement surface 102;

[0051] When the outer vertical wall 61 of the third convex groove 6 extends into the vertical groove body 41 of the first convex groove 4 in the vertical direction, and the column 3 extends into the vertical groove body 51 of the second convex groove 5 in the vertical direction, the curtain drive is fixed to the transmission box in the vertical direction, and the placement surface 102 supports the elastic ejector 9.

[0052] As a preferred solution but not a limitation, the elastic ejector 9 includes a slide groove 91 formed on the groove surface 72, an ejector body 92 located in the slide groove 91, and a compression spring 93. The compression spring 93 is arranged between the bottom of the slide groove 91 and the ejector body 92, so that the ejector body 92 can slide relative to the slide groove 91 and reset under the action of the compression spring 93.

[0053] As a preferred solution but not a limitation, the first convex groove 4, the second convex groove 5 and the wing plate 8 are all two pairs, the two pairs of the first convex groove 4 are symmetrically arranged on the driver, the two pairs of the second convex groove 5 are symmetrically arranged on the driver, and the two pairs of the wing plates 8 are symmetrically arranged on the driver.

[0054] Combination Figure 4 As shown, the front end connection structure (including the first convex groove 4, the second convex groove 5 and the wing plate 8) on one side of the curtain drive can cooperate with the right transmission box to achieve a horizontal installation connection; and the front end connection structure on the other side symmetrical to the curtain drive can cooperate with the left transmission box after turning the direction to also achieve a horizontal installation connection.

[0055] By symmetrically arranging the first convex groove 4, the second convex groove 5 and the wing plate 8 on the driver, both ends of the curtain driver of the utility model can be used to adapt to the transmission box, further improving the installation flexibility and convenience of the curtain driver.

[0056] Third embodiment:

[0057] Please refer to Figure 7 and Figure 8 As shown, this embodiment provides an electric curtain, including a curtain driver 11 and a transmission box 12, and the curtain driver 11 and the transmission box 12 are provided with the front end connection structure of the curtain driver described in the second embodiment.

[0058] Furthermore, the curtain driver 11 includes an output gear 13 driven by a motor 15, and the transmission box 12 includes an input gear 14 for driving a curtain belt. The output gear 13 and the input gear 14 are arranged horizontally. When the convex edge extends into the vertical groove in the vertical direction to complete the fixation of the curtain driver to the transmission box in the vertical direction, the output gear 13 of the curtain driver is meshed with the input gear 14 of the transmission box.

[0059] The embodiment of the utility model is provided with a front-end connection structure on the curtain drive and the transmission box, and the front-end connection structure includes a correspondingly arranged horizontal bite portion and a convex edge, the horizontal bite portion includes a vertical wall and a vertical groove body surrounded by the vertical wall, and the convex edge extends into the vertical groove body, so that the curtain drive of the embodiment of the utility model meets the condition of being installed relative to the transmission box in the vertical direction. When the curtain drive is installed on the transmission box, the convex edge is located in the vertical groove body, and the vertical wall of the horizontal bite portion fixes the curtain drive in one or more directions on the horizontal plane. Since the reaction force of the gear in the transmission box is also located in the horizontal direction, the horizontal bite portion and the convex edge of the embodiment of the utility model can offset the reaction force to a large extent in the horizontal direction, thereby improving the installation stability of the curtain drive, and can effectively avoid the problems of complex structure, high production cost, and inconvenient disassembly and assembly caused by the installation of complex structure with screws, simplifying the corresponding structure of the curtain drive and the transmission box, and ensuring the convenience of installation of the curtain drive.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A front end connection structure of a curtain drive, applied between the curtain drive and a transmission box, characterized in that: The front end connection structure includes a correspondingly arranged horizontal bite portion and a convex edge. In the curtain drive and the transmission box, one is provided with a horizontal bite portion and the other is provided with a convex edge. The horizontal bite portion includes a vertical wall and a vertical groove body formed by the vertical wall. The convex edge extends into the vertical groove body to fix the curtain drive to the transmission box in one or more directions on the horizontal plane.

2. The front end connection structure of the curtain driver according to claim 1, characterized in that: The convex edge extends into the vertical groove in the vertical direction, so that the curtain driver can be detachably fixed on the transmission box in the vertical direction.

3. The front end connection structure of the curtain driver according to claim 2, characterized in that: There are two pairs of horizontal bite parts and convex edges, and the opening directions of the notches of the vertical groove bodies of the two horizontal bite parts are opposite.

4. The front end connection structure of the curtain driver according to claim 3, characterized in that: The horizontal engaging portion includes a convex groove, which includes an inner vertical wall formed on the side wall of the curtain drive or the transmission box, a middle vertical wall formed by extending outward based on the inner vertical wall, and an outer vertical wall formed by extending from the end of the middle vertical wall. The inner vertical wall, the middle vertical wall and the outer vertical wall together form a vertical groove body.

5. The front end connection structure of the curtain driver according to claim 4, characterized in that: The convex edge is a column formed on the side wall of the curtain driver or the transmission box, or the convex edge is an outer vertical wall of the convex groove.

6. The front end connection structure of the curtain driver according to claim 5, characterized in that: The horizontal engaging portion is arranged on the curtain driver, including a first convex groove and a second convex groove. The convex edge is arranged on the transmission box, including a column and an outer vertical wall of the third convex groove. The first convex groove is arranged corresponding to the third convex groove, and the second convex groove is arranged corresponding to the column.

7. The front end connection structure of the curtain driver according to claim 6, characterized in that: The cross-sectional areas of the vertical groove bodies of the first convex groove and the second convex groove gradually increase in the vertical direction from bottom to top, and the bottom ends of the upright column and the third convex groove are also provided with transition surfaces.

8. The front end connection structure of the curtain driver according to claim 7, characterized in that: The front end connection structure comprises a groove formed on the bottom surface of the transmission box, the opening of the notch of the groove is arranged downward, the third convex-concave groove is formed on the front edge of the groove, and the column is formed on the rear edge of the groove.

9. The front end connection structure of the curtain driver according to claim 8, characterized in that: The front connection structure further comprises a wing plate horizontally arranged on the curtain drive, the wing plate extending outwardly from the side wall surface of the curtain drive, the first convex groove is formed at the head of the wing plate, and the second convex groove is formed at the tail of the wing plate; The groove also includes a lateral opening facing the curtain transmission box. When the outer vertical wall of the third convex groove extends into the vertical groove body of the first convex groove in the vertical direction, and the column extends into the vertical groove body of the second convex groove in the vertical direction, the curtain drive is fixed to the transmission box in the vertical direction, and the wing plate extends into the transmission box groove through the lateral opening and is placed on the groove surface of the transmission box groove.

10. The front end connection structure of the curtain driver according to claim 9, characterized in that: The front end connection structure further comprises an elastic ejector disposed above the groove surface of the transmission box groove, and the wing plate comprises a stopper located at the rear portion, the stopper is used to cooperate with the elastic ejector of the transmission box, and comprises a guide surface and a placement surface; When the outer vertical wall of the third convex groove extends into the vertical groove body of the first convex groove in the vertical direction, and the column extends into the vertical groove body of the second convex groove in the vertical direction, the curtain drive is fixed to the transmission box in the vertical direction, and the placement surface supports the elastic ejector.

11. The front end connection structure of the curtain driver according to claim 10, characterized in that: The elastic ejector comprises a slide groove formed on the groove surface, an ejector body located in the slide groove and a compression spring. The compression spring is arranged between the bottom of the slide groove and the ejector body, so that the ejector body can slide relative to the slide groove and reset under the action of the compression spring.

12. The front end connection structure of the curtain driver according to any one of claims 8 to 11, characterized in that: The first convex grooves, the second convex grooves and the wing plates are all in two pairs, the two pairs of the first convex grooves are symmetrically arranged on the driver, and the two pairs of the wing plates are symmetrically arranged on the driver.

13. An electric curtain, comprising a curtain driver and a transmission box, characterized in that: The curtain drive and the transmission box are provided with a front end connection structure of the curtain drive according to any one of claims 1 to 12.

14. The electric curtain according to claim 13, characterized in that: The curtain driver includes an output gear driven by a motor, and the transmission box includes an input gear for driving a curtain belt. The output gear and the input gear are arranged horizontally. When the convex edge extends into the vertical groove in the vertical direction to complete the fixation of the curtain driver to the transmission box in the vertical direction, the output gear of the curtain driver is meshed with the input gear of the transmission box.

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