Positioning device and sewing apparatus

Abstract

The utility model discloses a positioning device and sewing equipment. The utility model discloses a positioning device, including support cylinder, guide piece, first positioning piece and first drive part. The guide piece is fixedly connected in the outer peripheral wall of support cylinder, and the guide piece is opened with the guide groove in. The first positioning piece includes the positioning portion and the sliding portion who are connected with each other. The first drive part is connected the first positioning piece, and the first drive part is used for driving the first positioning piece movement to make the first positioning piece rotate around the axis of support cylinder. Through connecting the guide piece in the inner peripheral wall of support cylinder, and opening the guide groove that extends along the circumference of support cylinder in it, and letting the sliding portion slide in the guide groove, make the first positioning piece rotate around the outer peripheral wall of support cylinder in the positioning process, improve the fitting degree of positioning device and support cylinder, guarantee the clearance between the first positioning piece and support cylinder to keep stable, avoid the situation that the first positioning piece and support cylinder will be stuck with the hat brim, improve the positioning effect to the hat brim.

Description

Technical Field

[0001] This utility model relates to the field of sewing technology, specifically to a positioning device and sewing equipment. Background Technology

[0002] In the field of sewing technology, there are automatic sewing machines for hat brims that can improve sewing production efficiency. Before sewing the hat brim, it needs to be fixed in a fixed position on a support cylinder so that the sewing machine can sew the brim. However, the positioning device in related technologies has the problem of not fitting properly with the support cylinder on which the brim is placed. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a positioning device that can better fit the support tube on which the brim of a hat is placed.

[0004] This utility model also proposes a sewing device having the above-mentioned positioning device.

[0005] According to a first aspect of the present invention, a positioning device is applied to brim positioning and includes a support cylinder, a guide member, a first positioning member, and a first driving member. The brim can be placed on the support cylinder and conforms to the outer peripheral wall of the support cylinder. The guide member is fixedly connected to the outer peripheral wall of the support cylinder, and a guide groove is formed in the guide member, extending circumferentially along the support cylinder. The first positioning member includes a positioning part and a sliding part connected to each other. The positioning part is used to abut against the edge of the brim to allow the brim to slide circumferentially relative to the support cylinder to a preset position. The sliding part is slidably disposed in the guide groove. The first driving member is connected to the first positioning member and is used to drive the first positioning member to move, so that the first positioning member rotates about the axis of the support cylinder.

[0006] The positioning device according to the embodiments of this utility model has at least the following beneficial effects: The support cylinder is manufactured in a cylindrical shape to better place and press the curved brim into place. Positioning devices in related technologies also consist of a positioning element and a guiding mechanism; however, the guide mechanism's track is linear. Therefore, regardless of whether the guide mechanism is vertically or inclined, the positioning element will not fit well with the cylindrical support cylinder during the telescopic positioning process. This results in the positioning element not being able to properly approach the outer wall of the support cylinder to abut the edge of the brim, leading to poor fit. Furthermore, during positioning, there is a risk that the brim may get stuck in the gap between the positioning element and the outer peripheral wall of the support cylinder. The positioning device of this utility model connects the guide member to the inner peripheral wall of the support cylinder and opens a guide groove extending circumferentially along the support cylinder. The sliding part of the first positioning member is slidably disposed in the guide groove, so that the first positioning member will rotate around the outer peripheral wall of the support cylinder during the positioning process. This improves the fit between the positioning device and the support cylinder, ensures that the gap between the first positioning member and the support cylinder remains stable, avoids the situation where the first positioning member and the support cylinder jam the brim, and improves the positioning effect of the brim.

[0007] According to some embodiments of the present invention, the positioning device further includes a first mounting part, a second mounting part, and two connecting rods. Two first positioning members are symmetrically arranged along the central axis of the support cylinder. Each first positioning member is rotatably connected to one of the connecting rods. The ends of the two connecting rods away from the first positioning members are rotatably connected to the first mounting part. The first mounting part is slidably connected to the second mounting part in the vertical direction. The second mounting part is disposed below the support cylinder. The first driving member is used to drive the first mounting part to slide relative to the second mounting part in the vertical direction, thereby causing the connecting rods to rotate, so that the first positioning member rotates around the axis of the support cylinder.

[0008] According to some embodiments of the present invention, the positioning device further includes a second driving member and a base. The second mounting part is slidably connected to the base in a vertical direction. The first positioning member can be driven by the first driving member to be in the highest position. The second driving member is used to drive the second mounting part to slide relative to the base in a vertical direction to raise or lower the highest position.

[0009] According to some embodiments of the present invention, the positioning device further includes a lead screw, the second driving member is a motor, the power end of the second driving member is fixedly connected to one end of the lead screw, the lead screw is threadedly connected to the second mounting part, and the second driving member is used to drive the lead screw to rotate around its own central axis so that the second mounting part is raised or lowered relative to the base.

[0010] According to some embodiments of the present invention, the positioning device further includes an operating handle, which is fixedly connected to the end of the lead screw away from the second driving member, and the lead screw can be rotated when the operating handle is driven.

[0011] According to some embodiments of the present invention, the operating handle is coaxially arranged with the lead screw, the diameter of the operating handle is larger than the diameter of the lead screw, and / or the operating handle also has an anti-slip surface, which is arranged around the outer periphery of the operating handle.

[0012] According to some embodiments of the present invention, the positioning part includes a first segment, a second segment, and a third segment connected in sequence. The first segment is vertical and close to the outer peripheral surface of the support cylinder. The second segment is bent upward relative to the first segment. The outer peripheral wall of the support cylinder, the first segment, and the second segment together define an abutment groove. The abutment groove is used to abut the edge of the brim. The third segment is bent relative to the second segment and extends from bottom to top in a direction away from the support cylinder.

[0013] According to some embodiments of the present invention, the positioning device further includes a sensor, which is installed on the first positioning member and is used to detect whether the first positioning member abuts the edge of the brim when the first positioning member slides to the preset position.

[0014] According to some embodiments of the present invention, the positioning device further includes a second positioning member, which protrudes upward relative to the outer peripheral surface of the support cylinder, and is used to abut against and position the front end surface of the brim.

[0015] The sewing equipment according to a second aspect embodiment of the present invention includes the positioning device described in any one of the first aspect embodiments.

[0016] The sewing equipment according to the embodiments of the present invention has at least the following beneficial effects: The positioning device of the present invention connects the guide member to the inner peripheral wall of the support cylinder and opens a guide groove extending circumferentially along the support cylinder inside it, and allows the sliding part of the first positioning member to slide in the guide groove, so that the first positioning member will rotate around the outer peripheral wall of the support cylinder during the positioning process, thereby improving the fit between the positioning device and the support cylinder, ensuring that the gap between the first positioning member and the support cylinder remains stable, avoiding the situation where the first positioning member and the support cylinder jam the brim, and improving the positioning effect of the brim. The sewing equipment using this positioning device can effectively improve the positioning effect of the brim and the sewing quality.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0019] Figure 1 This is a perspective view of the positioning device in one embodiment of the present utility model;

[0020] Figure 2 This is a first front view of the positioning device in one embodiment of the present invention;

[0021] Figure 3 This is a second front view of the positioning device in one embodiment of the present invention;

[0022] Figure 4 for Figure 3 Enlarged view of region A in the middle;

[0023] Figure 5 This is a partial structural schematic diagram of the positioning device in one embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the structure of a positioning device in the prior art.

[0025] Reference numerals: Positioning device 100, support cylinder 101, guide member 102, first positioning member 103, second positioning member 104, first driving member 105, second driving member 106, lead screw 107, first mounting part 108, connecting rod 109, second mounting part 110, base 111, cap 112, sensor 113, positioning part 201, sliding part 202, operating handle 203, anti-slip surface 204, guide groove 205, first section 401, second section 402, third section 403, abutment groove 404. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0027] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0029] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0030] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] refer to Figures 1 to 3 According to a first aspect embodiment of the present invention, a positioning device 100 is used for positioning a brim 112, comprising a support cylinder 101, a guide member 102, a first positioning member 103, and a first driving member 105. The brim 112 can be placed on the support cylinder 101 and fits against the outer peripheral wall of the support cylinder 101. The guide member 102 is fixedly connected to the outer peripheral wall of the support cylinder 101, and a guide groove 205 is formed in the guide member 102, extending circumferentially along the support cylinder 101. The first positioning member 103 includes a positioning part 201 and a sliding part 202 connected to each other. The positioning part 201 is used to abut against the edge of the brim 112 so that the brim 112 slides relative to the support cylinder 101 circumferentially to a preset position, and the sliding part 202 is slidably disposed in the guide groove 205. The first driving member 105 is connected to the first positioning member 103. The first driving member 105 is used to drive the first positioning member 103 to move so that the first positioning member 103 rotates around the axis of the support cylinder 101.

[0032] The support tube 101 is manufactured in a cylindrical shape to better accommodate and press the curved brim 112 into place. (Reference) Figure 6 In related technologies, the positioning device 100 also consists of positioning elements ( Figure 6 Component 412 shown) and guide mechanism ( Figure 6 The component 411 shown is composed of, but is made of Figure 6 It is known that the guide mechanism has a straight track. Therefore, regardless of whether the guide mechanism is vertically or inclined, the positioning component will not fit the cylindrical support tube 101 well during the telescopic positioning process. This results in the positioning component not being able to get close to the outer wall of the support tube 101 to abut the edge of the brim 112. The fitting effect is poor, and there is a risk that the brim 112 may get stuck in the gap between the positioning component and the outer peripheral wall of the support tube 101 during positioning. The positioning device 100 of this utility model connects the guide member 102 to the inner peripheral wall of the support cylinder 101 and opens a guide groove 205 extending circumferentially along the support cylinder 101. The sliding part 202 of the first positioning member 103 is slidably disposed in the guide groove 205, so that the first positioning member 103 will rotate around the outer peripheral wall of the support cylinder 101 during the positioning process. This improves the fit between the positioning device 100 and the support cylinder 101, ensures that the gap between the first positioning member 103 and the support cylinder 101 remains stable, and avoids the situation where the first positioning member 103 and the support cylinder 101 jam the brim 112, thereby improving the positioning effect of the brim 112.

[0033] It should be noted that, Figure 2 The diagram shows the state of the first positioning member 103 in the retracted state, that is, in the lowest position. Figure 3 The diagram shows the first positioning member 103 in the extended state, that is, in the highest position. At this time, the first positioning member 103 is used to abut and position the two sides of the brim 112.

[0034] It should be noted that the guide groove 205 can be used as... Figure 2 and Figure 3 The opening shown can be inside the guide member 102, or it can be on the outer surface of the guide member 102, or it can be directly on the outer circumferential surface of the support cylinder 101. It can be designed to be concentric and coaxial with the outer surface of the support cylinder 101.

[0035] refer to Figures 1 to 3In some embodiments of this utility model, the positioning device 100 further includes a first mounting part 108, a second mounting part 110, and two connecting rods 109. Two first positioning members 103 are symmetrically arranged along the central axis of the support cylinder 101. Each first positioning member 103 is rotatably connected to a connecting rod 109. The ends of the two connecting rods 109 away from the first positioning member 103 are rotatably connected to the first mounting part 108. The first mounting part 108 is slidably connected to the second mounting part 110 in the vertical direction. The second mounting part 110 is disposed below the support cylinder 101. The first driving member 105 is used to drive the first mounting part 108 to slide relative to the second mounting part 110 in the vertical direction, thereby causing the connecting rods 109 to rotate, so that the first positioning member 103 rotates around the axis of the support cylinder 101. The symmetrical design of the linkage 109 transmission structure allows the first drive member 105 to synchronously control the extension or retraction of the two first positioning members 103 through the two linkages 109 rotatably connected to the first mounting part 108. This enables both sides of the brim 112 to be simultaneously abutted and positioned, improving the accuracy and synchronization of the brim 112 positioning and enhancing the positioning effect of the brim 112.

[0036] It should be noted that the reference Figure 1 In some embodiments of this utility model, the first driving component 105 is cylinder driven. Figure 1 The first driving component 105, as indicated, is the air inlet and outlet of the air source. The second mounting part 110 is a cylinder, and the first mounting part 108 is the piston rod inside the cylinder. Thus, the first driving component 105, through the air inlet, drives the first mounting part 108 to move vertically relative to the second mounting part 110. The cylinder-driven structure is simple and can be adapted to the lower space of the support cylinder 101 of different shapes and sizes. Furthermore, the extension and retraction of the cylinder can be controlled by a solenoid valve, making remote control relatively easy. The cylinder-driven system also has advantages such as fast response speed, facilitating the quick contact of the first positioning component 103 with the cap 112, and smooth movement. In some embodiments, the first driving component 105 can also be a motor, which then drives the first mounting part 108 to move up and down relative to the second mounting part 110 through a gear and rack.

[0037] refer to Figure 1 , Figure 2 and Figure 5In some embodiments of this utility model, the positioning device 100 further includes a second driving member 106 and a base 111. The second mounting part 110 is slidably connected to the base 111 in the vertical direction. The first positioning member 103 can be driven by the first driving member 105 to be in the highest position. The second driving member 106 is used to drive the second mounting part 110 to slide relative to the base 111 in the vertical direction to raise or lower the highest position. In actual processing, the brim 112 has different size specifications for production. When the brim 112 is relatively long, the two side edges of the brim 112 are lower than the top of the support cylinder 101, and the highest position of the first positioning member 103 should also be lowered so that it can just abut the edge of the brim 112. When the brim 112 is relatively short, the two side edges of the brim 112 are higher than the top of the support cylinder 101, and the highest position that the first positioning member 103 can slide to should also be raised. The highest position here is the preset position mentioned in the text, that is, the position that abuts the brim 112. Therefore, the design of the second drive member 106 enables the second mounting part 110 and the first mounting part 108, connecting rod 109, first positioning member 103 and other components provided on the second mounting part 110 to rise or fall as a whole, so that the positioning device 100 can adapt to the positioning requirements of brim 112 of different lengths.

[0038] refer to Figure 1 and Figure 2 In some embodiments of this utility model, the positioning device 100 further includes a lead screw 107, and the second driving member 106 is a motor. The power end of the second driving member 106 is fixedly connected to one end of the lead screw 107. The lead screw 107 is threadedly connected to the second mounting part 110. The second driving member 106 is used to drive the lead screw 107 to rotate around its own central axis, so that the second mounting part 110 is raised or lowered relative to the base 111. Since the highest position of the first positioning member 103 only needs to be adjusted when changing the size of the brim 112, there is no need to frequently raise or lower the second mounting part 110. The lifting mechanism of the lead screw 107 has good self-locking performance. Without external force, the load will not cause the second mounting part 110 to descend on its own, ensuring the safety and reliability of the operation. In addition, the transmission accuracy is high, which can accurately control the lifting stroke of the second mounting part 110 to better meet the positioning requirements of the first positioning member 103 for the brim 112. The motor drive of the second driving member 106 is also relatively smooth and easy to set up a remote control device for starting and stopping. In some embodiments of this utility model, worm gear transmission can also be used to adjust the position of the second driving member 106, or gear rack, sprocket and chain transmission methods can be selected to realize the lifting and lowering of the second mounting part 110.

[0039] refer to Figures 1 to 3In some embodiments of this utility model, the positioning device 100 further includes an operating handle 203, which is fixedly connected to the end of the lead screw 107 away from the second driving member 106. When the operating handle 203 is driven, the lead screw 107 can rotate. In this way, even if the second driving member 106 fails or loses power due to other factors, the lead screw 107 can still be driven to rotate by the operating handle 203, thereby realizing the lifting function of the second mounting part 110 and improving the overall operational stability of the equipment. It should be noted that when the second driving member 106 can operate normally, it is preferable to drive the lead screw 107 to rotate by the second driving member 106, and the second driving member 106 and the operating handle 203 cannot be driven at the same time to improve safety performance and component life.

[0040] refer to Figure 2 and Figure 3 In some embodiments of this utility model, the operating handle 203 is coaxially arranged with the lead screw 107, the diameter of the operating handle 203 is larger than the diameter of the lead screw 107, and / or, the operating handle 203 also has an anti-slip surface 204, which is arranged around the outer periphery of the operating handle 203. Since the end of the lead screw 107 away from the operating handle 203 is also connected to the second drive member 106, the lead screw 107 will be subject to a certain degree of resistance when it is rotated. Designing the diameter of the operating handle 203 to be larger than the diameter of the lead screw 107 can effectively increase the torque, making it easier to drive the lead screw 107 to rotate when applying torsional force to the operating handle 203. Similarly, the anti-slip surface 204 on the outer periphery of the operating handle 203 is to increase the friction and make it easier for the user to hold and rotate the operating handle 203 to achieve the rotation of the lead screw 107. This allows the user to manually adjust the highest position of the first positioning member 103, i.e. the preset position, even if the second drive member 106 fails, to adapt to the processing requirements of different sizes of brim 112.

[0041] refer to Figure 3 and Figure 4 In some embodiments of this utility model, the positioning part 201 includes a first segment 401, a second segment 402, and a third segment 403 connected in sequence. The first segment 401 is vertical and close to the outer peripheral surface of the support cylinder 101. The second segment 402 is bent upward relative to the first segment 401. The outer peripheral wall of the support cylinder 101, the first segment 401, and the second segment 402 together define an abutment groove 404, which is used to abut against the edge of the brim 112. The third segment 403 is bent relative to the second segment 402 and extends from bottom to top away from the support cylinder 101. This design allows the edge of the brim 112 to be guided by the third segment 403 during the positioning process, enabling it to slide into the abutment groove 404 formed by the first segment 401, the second segment 402, and the outer peripheral wall of the support cylinder 101. Figure 4The abutment groove 404 structure shown can also prevent the edge of the brim 112 from disengaging from the positioning part 201 during the upward sliding process, thereby improving the stability of the positioning process.

[0042] refer to Figure 1 and Figure 4 In some embodiments of this utility model, the positioning device 100 further includes a sensor 113, which is installed on the first positioning member 103. The sensor 113 is used to detect whether the first positioning member 103 abuts against the edge of the brim 112 when it slides to a preset position. The sensor 113 prevents the positioning device 100 from spinning idly when the brim 112 is not on the support cylinder 101 or is stuck in another position. Abnormalities can be detected, adjusted, and maintained immediately, improving safety and stability. Specifically, the sensor 113 can be in various forms. A pressure sensor 113 can be used and connected to the first segment 401 of the positioning part 201 to detect whether the first segment 401 is subjected to pressure when it slides to the preset position, or... Figure 1 As shown, a sensing element is positioned above the sensor 113. When the brim 112 is abutted by the first positioning member 103, a portion of the brim 112 will abut against the sensing element, causing it to bend and move closer to the sensor 113. The sensor 113 detects the change in the position of the sensing element, thus determining that the first positioning member 103 is abutting against the edge of the brim 112; otherwise, it is not abutting against the edge of the brim 112. Alternatively, an infrared sensor 113 can be used. When the first positioning member 103 abuts against the edge of the brim 112, infrared light is blocked by the brim 112, thus detecting the presence of the brim 112; otherwise, it is not abutting against the edge of the brim 112. Therefore, the sensor 113 can use various structures and forms, as long as it can detect the presence of the brim 112 when the first positioning member 103 abuts against the edge of the brim 112.

[0043] refer to Figure 1 In some embodiments of this utility model, the positioning device 100 further includes a second positioning member 104. The second positioning member 104 protrudes upward relative to the outer peripheral surface of the support cylinder 101 and is used to abut and position the front end face of the brim 112. The first positioning member 103 is used to position the two side edges of the brim 112. On this basis, the addition of the second positioning member 104 to abut and position the front end face of the brim 112 can further improve the positional accuracy of the brim 112, thereby enabling better processing of the brim 112 for sewing and other procedures.

[0044] The sewing equipment according to a second aspect embodiment of the present invention includes a positioning device 100 as described in any of the first aspect embodiments. The positioning device 100 of this embodiment connects a guide member 102 to the inner peripheral wall of a support cylinder 101, and provides a guide groove 205 extending circumferentially along the support cylinder 101. The sliding portion 202 of a first positioning member 103 slides within the guide groove 205, causing the first positioning member 103 to rotate around the outer peripheral wall of the support cylinder 101 during positioning. This improves the fit between the positioning device 100 and the support cylinder 101, ensuring a stable gap between the first positioning member 103 and the support cylinder 101, preventing the first positioning member 103 and the support cylinder 101 from jamming the brim 112, and improving the positioning effect of the brim 112. The sewing equipment using this positioning device 100 can effectively improve the positioning effect of the brim 112 and the sewing quality.

[0045] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A positioning device, used for positioning a hat brim, characterized in that, include: A support tube, wherein the brim can be placed on the support tube and fits against the outer peripheral wall of the support tube; A guide member is fixedly connected to the outer peripheral wall of the support cylinder, and a guide groove is provided inside the guide member, which extends along the circumference of the support cylinder. The first positioning element includes a positioning part and a sliding part connected to each other. The positioning part is used to abut against the edge of the brim so that the brim slides relative to the support cylinder in the circumferential direction to a preset position. The sliding part is slidably disposed in the guide groove. A first driving member is connected to the first positioning member, and the first driving member is used to drive the first positioning member to move so that the first positioning member rotates about the axis of the support cylinder.

2. The positioning device according to claim 1, characterized in that, The positioning device further includes a first mounting part, a second mounting part, and two connecting rods. Two first positioning members are symmetrically arranged along the central axis of the support cylinder. Each first positioning member is rotatably connected to one of the connecting rods. The ends of the two connecting rods away from the first positioning members are rotatably connected to the first mounting part. The first mounting part is slidably connected to the second mounting part in the vertical direction. The second mounting part is located below the support cylinder. The first driving member is used to drive the first mounting part to slide relative to the second mounting part in the vertical direction, thereby causing the connecting rods to rotate, so that the first positioning member rotates around the axis of the support cylinder.

3. The positioning device according to claim 2, characterized in that, The positioning device further includes a second driving member and a base. The second mounting part is slidably connected to the base in a vertical direction. The first positioning member can be driven by the first driving member to be in the highest position. The second driving member is used to drive the second mounting part to slide relative to the base in a vertical direction to raise or lower the highest position.

4. The positioning device according to claim 3, characterized in that, The positioning device further includes a lead screw, the second driving component is a motor, the power end of the second driving component is fixedly connected to one end of the lead screw, the lead screw is threadedly connected to the second mounting part, and the second driving component is used to drive the lead screw to rotate around its own central axis so that the second mounting part is raised or lowered relative to the base.

5. The positioning device according to claim 4, characterized in that, The positioning device further includes an operating handle, which is fixedly connected to the end of the lead screw away from the second driving member. When the operating handle is driven, the lead screw can be rotated.

6. The positioning device according to claim 5, characterized in that, The operating handle is coaxially arranged with the lead screw, the diameter of the operating handle is larger than the diameter of the lead screw, and / or the operating handle also has an anti-slip surface, which is arranged around the outer periphery of the operating handle.

7. The positioning device according to claim 1, characterized in that, The positioning part includes a first segment, a second segment, and a third segment connected in sequence. The first segment is vertical and close to the outer peripheral surface of the support cylinder. The second segment is bent upward relative to the first segment. The outer peripheral wall of the support cylinder, the first segment, and the second segment together define an abutment groove for abutting the edge of the brim. The third segment is bent relative to the second segment and extends from bottom to top away from the support cylinder.

8. The positioning device according to claim 1, characterized in that, The positioning device further includes a sensor, which is installed on the first positioning member. The sensor is used to detect whether the first positioning member abuts the edge of the brim when the first positioning member slides to the preset position.

9. The positioning device according to claim 1, characterized in that, The positioning device further includes a second positioning member, which protrudes upward relative to the outer peripheral surface of the support cylinder, and is used to abut and position the front end face of the brim.

10. A sewing machine used for sewing hat brims, characterized in that, Includes the positioning device as described in any one of claims 1 to 9.

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