Edge folding device and bag opening machine

Abstract

The utility model relates to an edge folding device and a bag opening machine, the edge folding device comprises a base, a telescopic power and an edge folding module, the edge folding module comprises a plurality of edge folding parts, an elastic part and two end parts, the two end parts are oppositely arranged, at least one end part is movably connected to the base, and the moving direction of the end parts is a first direction; each edge folding component is movably arranged between the two end components, the elastic piece is arranged between at least two adjacent edge folding components, and a hook-shaped first edge folding structure is constructed on the side face of each edge folding component; the end parts are in transmission connection with the adjacent edge folding parts; the telescopic power is mounted on the base, is in transmission connection with the movable end parts and is used for adjusting the distance between the two end parts; the bag opening device can meet the bag opening requirements of bag openings of various sizes, the bag opening process is simpler and more efficient, the cost is lower, and the universality is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of bag opening equipment, in particular to a folding device and a bag opening machine. Background Art

[0002] A bag opening machine (or bag opening equipment, bag opening sewing machine, etc.) is a sewing machine specially used for forming bag openings. It is mainly used for sewing pockets, zippers and other parts in the clothing, luggage and other industries, and is widely used in the sewing industry.

[0003] The existing bag opening machine generally includes a laser cutting device, a sewing device, a folding device and a folding frame device. The laser cutting device is mainly used to cut the fabric, the sewing device is mainly used to sew, and the folding frame device is mainly used to constrain the fabric and form a fold with the folding device. The bag opening process of the existing bag opening machine generally includes: (1) determining the area on the fabric where the bag opening needs to be sewn, which can be called the bag opening area, such as Figure 1 (2) using a laser cutting device to cut out the desired seam in the bag opening area, the seam is usually Y-shaped, such as Figure 2 As shown, at the same time, four folding pieces (or pocket edge pieces) can be formed on the fabric by processing and sewing; (3) a folding device adapted to the desired pocket opening is inserted into the pocket opening area, and the folding piece is folded along the edge of the pocket opening to the inner side of the pocket opening by the folding device to form the desired pocket opening shape, such as Figure 3 As shown, the bag opening forming process is completed; subsequently, the zipper placement or bag lip placement or sewing process can be performed according to different actual needs.

[0004] In the bag opening machines disclosed in the prior art, the folding devices configured therein all adopt an L-shaped structure, so that the folding devices of the L-shaped structure can be used to drive the folding pieces to form bends. For example, a bag opening machine for garment bag opening processing disclosed in Chinese patent CN 111575926 A, a continuous production garment bag opening machine disclosed in Chinese patent CN 112430916 A, and a bag opening folding mechanism for garment bag opening processing disclosed in Chinese patent CN 212655959U, etc., because the existing folding devices all adopt an L-shaped structure and have fixed sizes, they are only suitable for making bag openings of corresponding sizes. When the size of the bag opening changes, it is necessary to replace the folding device adapted thereto, which is not only troublesome to operate, but also costly and needs to be solved urgently. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a folding device with adjustable length, which can meet the folding requirements of bags of different sizes. The main concept is:

[0006] A folding device comprises a base, a telescopic power and a folding module, wherein the folding module comprises a folding part, an elastic part and two end parts, wherein the two end parts are arranged relatively to each other, at least one end part is movably connected to the base, and the moving direction of the end part is a first direction; each folding part is movably arranged between the two end parts, and the moving direction of the folding part is the first direction, the elastic part is arranged between at least two adjacent folding parts, and the side surface of each folding part is respectively constructed with a hook-shaped first folding structure; the end parts are transmission-connected to the adjacent folding parts; the telescopic power is installed on the base, the telescopic power is transmission-connected to the movable end part, the telescopic power is used to adjust the distance between the two end parts, when the two end parts are close to each other, the elastic potential energy of the elastic part increases, and when the end parts are away from each other, the elastic potential energy of the elastic part decreases. In the present solution, elastic pieces are respectively arranged on both sides of the folding parts, and the elastic force of the elastic pieces is along the first direction, so that the force along the first direction can be transmitted between the two folding parts through the elastic pieces; through the cooperation of the two end parts, the elastic pieces and the folding parts, the folding module can be extended and retracted along the first direction, and when the end parts are close to each other, the elastic pieces are squeezed, and the elastic pieces synchronously transmit the force between the folding parts and the folding parts, so that the distance between the folding parts and the folding parts can be synchronously reduced, so as to achieve the purpose of reducing the length of the folding module to adapt to a smaller bag opening, and in this process, the elastic potential energy of each elastic piece gradually increases; when the end parts are away from each other, the elastic piece is automatically released. The elastic potential energy causes the distance between the folding parts to increase synchronously, thereby achieving the purpose of increasing the length of the folding module to adapt to the bag opening of a larger size, and in this process, the elastic potential energy of the elastic part gradually decreases; by configuring the telescopic power, the telescopic power can be used to effectively adjust the length of the folding module, which is conducive to realizing automatic adjustment and control; and based on the present design, in the process of extending and shortening the folding module, it can be ensured that the folding parts can always be distributed relatively evenly between the two end parts, which can better meet the folding requirements of the two side edges along the length direction in bag openings of different sizes, thereby solving the problem of achieving better folding effects on the two side edges along the length direction in bag openings of different sizes. By constructing a first hook-shaped folding structure on the side of the folding part, the change of the spacing between the folding parts will not affect and interfere with the first folding structure, and because the spacing between the folding parts can be changed synchronously and evenly, the first folding structures can cooperate with each other under different spacings and can adapt to the long sides of the bag opening of different lengths, so as to jointly assist the long sides in bag openings of different sizes to realize the folding function, which can solve the problem of folding the long sides in bag openings of different sizes.

[0007] In order to solve the problem of adapting to the folding requirements of the two wide sides of the bag openings of different sizes, in some solutions, a first folding structure in a hook shape is also constructed on the end surface of the folding component located at the end. At this time, the length of the folding module is equal to the distance between the two folding components located at the end. Through the expansion and contraction of the folding module, the distance between the two folding components located at the end can be adapted to the bag openings of different lengths, so that the first folding structure of the end surface of the folding component can fold the two wide sides of the bag opening.

[0008] In order to solve the problem of adapting to the requirements of folding the two wide sides of the bag openings of different sizes, in other schemes, the end of the end member away from the folding member is constructed with a second folding structure in the shape of a hook. In the process of folding, the movement of the end member drives the second folding structure in the shape of a hook to move synchronously along the first direction, which can not only adapt to the bag openings of different lengths, but also drive the folding pieces at both ends of the bag opening to bend by the movement of the second folding structure along the first direction, so that the wide side of the bag opening forms a folding. Since the spacing between the two end members is adjustable, the second folding structure on the end member can be used to assist the folding pieces at both ends of the bag openings of different sizes to bend and form a folding in the process of opening the bag, so as to realize the folding function, and can solve the problem of folding the two ends of the bag openings of different sizes along the length direction.

[0009] In order to better adapt to the bag openings of different lengths and fold the long sides of the bag openings of different sizes, further, the side surfaces of the end components are respectively constructed with a third folding structure in a hook shape, the third folding structure is adapted to the first folding structure, and the third folding structure is used to assist the folding. The third folding structure on the side surface of the end component can cooperate with the first folding structure on the side surface of the folding component, so as to form a folding structure with a longer size and a more continuous structure on the side surface of the entire folding module, which can not only meet the folding requirements of the long sides of the bag openings of different sizes, but also help to achieve better folding functions and better folding effects.

[0010] In order to solve the problem of folding the two ends of the bag openings of different sizes along the length direction, further, the second folding structure includes a positioning surface and a raised portion protruding from the positioning surface, the raised portion is configured with a limiting surface for limiting the folding piece, and the positioning surface and the limiting surface form a hook shape, so as to cooperate with the corresponding folding process to fold the two ends of the bag opening along the length direction.

[0011] Preferably, the first folding structure is adapted to the second folding structure. The second folding structure, the first folding structure and the third folding structure are adapted to each other, which can effectively prevent the folding actions in the two directions from interfering with each other, making the folding actions in the two directions more coordinated and facilitating the folding actions in the two directions at the same height, thereby simplifying the bag opening process.

[0012] In order to solve the problem of meeting the requirements of folding the long edges of bags of different sizes, preferably, the first folding structure includes a positioning surface and a raised portion protruding from the positioning surface, the raised portion is configured with a limiting surface for limiting the folding piece, and the positioning surface and the limiting surface form a hook shape; the third folding structure includes a positioning surface and a raised portion protruding from the positioning surface, the raised portion is configured with a limiting surface for limiting the folding piece, and the positioning surface and the limiting surface form a hook shape; the positioning surface of the third folding structure is adapted to the positioning surface of the first folding structure, and the limiting surface of the third folding structure is adapted to the limiting surface of the first folding structure. In order to cooperate with the corresponding folding process to perform the folding of the two long edges of the bag opening, and to meet the folding requirements of the long edges of bags of different lengths.

[0013] Furthermore, the invention further comprises a guide mechanism, wherein the guide mechanism comprises a guide part and a plurality of movable parts adapted to the guide part, the guide part is arranged along the first direction, each movable part respectively forms a moving pair with the guide part, and each folding part is respectively connected to the guide part through the cooperation between each movable part and the guide part. In order to guide the movement of the folding part through the cooperation between each movable part and the guide part, not only each part has the freedom to move along the first direction, but also the movement accuracy of the folding part along the first direction can be improved.

[0014] In order to solve the problem of improving the movement accuracy of the folding part, further, the guide part adopts a guide shaft, the guide shaft is arranged along the first direction, the movable part is a guide hole adapted to the guide shaft, the guide hole is constructed in the folding part, and the folding part is sleeved on the guide shaft through the guide hole; the guide shaft is installed on one of the end parts, and the other end part is constructed with a guide hole adapted to the guide shaft, and the guide shaft passes through the guide hole; the elastic member is sleeved on the guide shaft. In this scheme, by directly installing the guide shaft on the end part, the end part is used as the positioning reference of the guide shaft, so that the end part and the guide shaft act synchronously, and the folding part moves along the guide shaft, thereby eliminating the error caused by the different positioning references, which is conducive to further improving the movement accuracy of the folding part. By sleeved the elastic member on the guide shaft, so that the guide shaft can be used to support the elastic member, and it can be ensured that the elastic force direction of the elastic member is consistent with the first direction, the stability of the elastic member can be effectively improved.

[0015] To further improve the movement accuracy of the folding component, each end component is further equipped with at least one guide shaft, and the guide shafts are parallel to each other, so that at least two guide shafts are used to guide the movement process of the folding component and the end component, thereby further improving the movement accuracy.

[0016] Preferably, the elastic member is a conical spring or a cylindrical helical compression spring.

[0017] In order to solve the problem of improving the movement accuracy of the end component along the first direction, further, it also includes a guiding mechanism, the guiding mechanism includes a guiding part and a movable part adapted to the guiding part, the guiding part is arranged along the first direction, the movable part is movably constrained to the guiding part, the guiding part is connected to the base, and the movable end component is connected to the movable part; it also includes a linear drive module arranged along the first direction, the telescopic power is connected to the linear drive module, and the linear drive module is connected to the end component. By configuring the guiding mechanism, the movement of the end component is guided by the cooperation of the guiding part and the movable part, and the movement accuracy of the end component along the first direction is improved; by configuring the linear drive module, the position of the end component is adjusted along the first direction by using the telescopic power, so as to achieve the purpose of adjusting the length of the folding module according to actual needs.

[0018] The sixth aspect of the utility model is to solve the problem of simplifying the folding process and improving the folding precision. Further, the two end parts are movably connected to the base, the two end parts are symmetrically arranged, and the telescopic power drives the two end parts to move synchronously in opposite directions. With such a design, the telescopic movement of the folding module can be driven with the middle position of the two end parts as the center, so as to achieve the purpose of adjusting the length of the folding module with the middle position of the two end parts as the center. In this way, in actual use, not only can the action be simplified and the number of positioning times be reduced, thereby effectively simplifying the folding process and improving the folding efficiency, but also the folding precision can be improved.

[0019] Preferably, the linear drive module comprises a rotating shaft and a nut, the rotating shaft comprises an intermediate shaft section and a screw section connected to both ends of the intermediate shaft section, the threads of the two screw sections are in opposite directions, the screw sections are respectively threadedly connected with nuts, the nuts are connected to the end parts, and the telescopic power is connected to the intermediate shaft section in a transmission manner. The telescopic power is used to drive the rotating shaft to rotate, so that the rotation of the rotating shaft can drive the two nuts to move synchronously in the opposite direction, and then the two end parts can be driven to move synchronously in the opposite direction, so as to achieve the purpose of adjusting the length of the hemming module with the middle position of the two end parts as the center.

[0020] A bag opening machine comprises a frame and the folding device, wherein the folding device is installed on the frame.

[0021] Compared with the prior art, the folding device and bag opening machine provided by the utility model can meet the bag opening needs of bags of various sizes, which not only makes the bag opening process simpler and more efficient, but also can effectively reduce costs and significantly improve versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a partial top view of the fabric.

[0024] Figure 2 Laser cut fabrics.

[0025] Figure 3 The fabric after the hem is folded inwards to form the pocket.

[0026] Figure 4 This is a front view of a folding device provided in an embodiment of the utility model, and the dotted line direction in the figure is the first direction.

[0027] Figure 5 for Figure 4 Right view of .

[0028] Figure 6 The utility model is provided in a folding device, a partial structural schematic diagram of an end component.

[0029] Figure 7 for Figure 6 main view.

[0030] Figure 8 for Figure 6 Right view of .

[0031] Fig. 9 The present invention is a schematic diagram of the partial structure of a folding component in a folding device provided in an embodiment of the present invention.

[0032] Fig.10 for Fig. 9 Right view of .

[0033] Fig.11 It is a schematic diagram of the three-dimensional structure of another folding device provided in an embodiment of the utility model.

[0034] Fig.12 for Fig.11 Right view of .

[0035] Fig.13 for Fig.11 The front view shows that the length of the hemming module is the smallest.

[0036] Fig.14 for Fig.11Front view, the hemming module has the largest length.

[0037] Fig.15 It is a schematic diagram of the partial structure of another folding device provided in an embodiment of the utility model.

[0038] Fig.16 It is a structural schematic diagram of another folding component in a folding device provided in an embodiment of the utility model.

[0039] Fig.17 This is a schematic diagram of the partial structure of a bag opening device provided in Example 4 of the utility model.

[0040] Fig.18 This is a schematic diagram of the folding device aligning with the bag opening area during the bag opening process.

[0041] Fig.19 This is a schematic diagram of the lower end of the folding device being inserted into the bag opening area during the bag opening process.

[0042] Fig. 20 This is a schematic diagram of adjusting the length of the folding device and adapting the length of the bag opening during the bag opening process.

[0043] Fig.21 This is a schematic diagram of the process of opening a bag, in which the pull-out plate is extended and the folded edge piece is pressed against the positioning surface.

[0044] Fig. 22 This is a schematic diagram of the folding device moving upward and pressing the folding piece during the bag opening process.

[0045] Fig.23 This is a schematic diagram of the upper pressing plate clamping the folding edge during the bag opening process.

[0046] Fig.24 This is a schematic diagram of the drawer plate moving in the opposite direction and exiting the folding device during the bag opening process.

[0047] Fig.25 This is a schematic diagram of adjusting the length of the folding device to be smaller than the bag opening length after the folding is completed during the bag opening process.

[0048] Markings in the figure are as follows: fabric 1, pocket opening 11, pocket opening area 12, seam 13, folding piece 14; folding device 2, base 21, base 211, folding module 23, lifting power 24, linear drive module 25, elastic member 26; end member 3, second folding structure 31, third folding structure 32, positioning surface 33, protrusion 34, limit surface 35, guide surface 36, sinking groove 37, guide shaft 38; folding member 4, first folding structure 41, guide hole 42, groove 43; guide rail 51, slider 52; rotating shaft 61, intermediate shaft section 62, screw section 63, nut 64, screw 65, active pulley 66, driven pulley 67, synchronous belt 68; frame 7; folding frame pressing device 8, folding forming module 81, lower pressure plate 82, upper pressure plate 83, pull-out plate 84. DETAILED DESCRIPTION

[0049] The technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, rather than all the embodiments. The components of the embodiment of the utility model generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiment of the utility model. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the utility model.

[0050] Example 1

[0051] The present embodiment provides a folding device suitable for bag opening equipment, including a base 21, a telescopic power 22 and a folding module 23, wherein the structure of the base 21 can be determined according to actual needs, and other mechanisms in the folding device 2 can be directly or indirectly installed on the load-bearing frame.

[0052] In this device, the folding module 23 is mainly used to insert the fabric 1 and cooperate with other mechanisms to achieve the folding function. In this embodiment, the folding module 23 includes a plurality of folding components 4, an elastic component 26 and two end components 3, such as Figure 4 and Figure 5 As shown, the two end parts 3 are arranged opposite to each other, and at least one end part 3 is movably connected to the base 21 so that it can move relative to the base 21. For the convenience of description, in this embodiment, the moving direction of the end part 3 is taken as the first direction (or called the X direction). Figure 4 As shown, the first direction is preferably a horizontal direction.

[0053] In this embodiment, the telescopic power 22 is installed on the base 21. Figure 4 and Fig.11 As shown, the telescopic power 22 is mainly used to provide power for the telescopic movement of the folding module 23. During implementation, the telescopic power 22 can be a stepper motor or a servo motor. The telescopic power 22 is connected to the movable end member 3 in a transmission manner so as to drive the end member 3 to move along the first direction by the telescopic power 22, so as to accurately adjust the position of the end member 3 along the first direction by the telescopic power 22, thereby effectively adjusting the distance between the two end members 3, and achieving the purpose of changing the length of the folding module 23.

[0054] like Figure 4 and Fig.11 As shown, each folding component 4 is movably disposed between the two end components 3, and the folding component 4 can move relative to the base 21, and the moving direction of the folding component 4 is consistent with the moving direction of the end component 3. Figure 4 As shown, an elastic member 26 is provided between two adjacent folding parts 4, so that the folding parts 4 are separated from each other by the elastic member 26 therebetween, and the folding parts 4 and the end parts 3 can also be driven to move synchronously by the elastic member 26. In this embodiment, the elastic member 26 preferably adopts a compression spring, and the elastic member 26 can be configured to always have elastic force during actual use, so that there is always an interaction force between the folding parts 4 and the folding parts 4, and the interaction force is the elastic force of the elastic member 26, so that when the two end parts 3 approach each other, the elastic member 26 is squeezed, and the elastic member 26 synchronously transmits the interaction force between the folding parts 4 and the folding parts 4, and the spacing between the folding parts 4 and the folding parts 4 can be synchronously reduced, so as to achieve the purpose of reducing the length of the folding module 23 to adapt to the smaller bag opening 11, and in this process, the elastic potential energy of each elastic member 26 gradually increases; as shown Fig.13 and Fig.14 As shown, when the end parts 3 move away from each other, the distance between the folding parts 4 and the folding parts 4 increases synchronously, so as to increase the length of the folding module 23 to adapt to the bag opening 11 with a larger size, and in this process, the elastic potential energy of the elastic part 26 gradually decreases; with such a design, no matter whether the folding module 23 is extended or shortened, it can ensure that each folding part 4 is always distributed relatively evenly between the two end parts 3, which can better meet the folding requirements of the two side edges (i.e., the long sides) along the length direction of bag openings 11 of different sizes, and can achieve better folding effects on the two side edges along the length direction of bag openings 11 of different sizes.

[0055] In addition, since the folding device 2 can automatically adjust the length of the folding module 23 through the telescopic power 22, and can ensure that at any length, each folding component 4 can be distributed relatively evenly between the two end components 3, in actual use, it can meet the folding requirements of bag openings 11 of different sizes, without the need for manual disassembly and replacement of the folding device 2, making the bag opening process simpler and more efficient.

[0056] In implementation, the number of the folding components 4 can be determined according to actual needs. In implementation, the folding device 2 can be preferably configured with at least two folding components 4, such as Figure 4 As shown, it is more conducive to achieving a better hemming effect on both sides along the length direction of the bag opening 11. At this time, when the two end parts 3 are close to each other, the spacing between the adjacent hemming parts 4 is synchronously reduced, and when the end parts 3 are away from each other, the spacing between the adjacent hemming parts 4 is synchronously increased.

[0057] In this embodiment, the end member 3 is connected to the adjacent folding member 4 by transmission, so that each folding member 4 can be synchronously driven by the end member 3. In one embodiment, the elastic member 26 can also be arranged between the end member 3 and the adjacent folding member 4, so that the end member 3 can be connected to the folding member 4 by transmission through the elastic member 26, as shown in the figure. For another example, in another embodiment, the end member 3 can also be directly fixedly connected to the adjacent folding member 4. Of course, in implementation, the end member 3 and the adjacent folding member 4 can also be an integrally formed component.

[0058] In specific implementation, the elastic member 26 may preferably be a helical compression spring (such as a cylindrical helical compression spring), a conical helical spring (or a truncated cone helical compression spring), a spiral helical spring, etc. In implementation, one, two or more elastic members 26 may be arranged between two adjacent folding parts 4, and the two ends of the elastic member 26 may be respectively connected to the corresponding folding parts 4, and there may be no connection between the elastic member 26 and the corresponding folding parts 4. Similarly, in implementation, one, two or more elastic members 26 may be arranged between the end part 3 and the adjacent folding part 4, and the two ends of the elastic member 26 may be respectively connected to the corresponding folding part 4 and the end part 3, and there may be no connection between the elastic member 26 and the corresponding folding part 4 or the corresponding end part 3.

[0059] To ensure that the end member 3 moves strictly along the first direction, in a more perfect solution, the folding device 2 further includes a guide mechanism, the guide mechanism includes a guide portion and a movable portion adapted to the guide portion, the guide portion is connected to the base 21 and arranged along the first direction, such as Figure 4 and Fig.11 As shown, the movable part is movably constrained by the guide part, and the movable end part 3 is connected to the movable part, which not only allows the end part 3 to have the freedom to move along the first direction, but also improves the movement accuracy of the end part 3 along the first direction. In implementation, the guide mechanism has multiple implementations. For example, in one implementation, the guide part can be a guide rail 51, the movable part can be a slider 52 adapted to the guide rail 51, and the end part 3 can be directly or indirectly connected to the slider 52 so as to move synchronously with the slider 52. For example, as Fig.11As shown, in this embodiment, two sets of guide mechanisms are configured, the guide part of the guide mechanism adopts a guide rail 51, the movable part of the guide mechanism adopts a slider 52, and the end member 3 is installed on a connecting plate, which simultaneously connects the sliders 52 in the two sets of guide mechanisms. Fig.11 As shown, the sliders 52 are respectively constrained on the corresponding guide rails 51, and the guide rails 51 are horizontally fixed to the base 21. The two guide rails 51 are parallel to each other. Fig.11 and Fig.12 As shown, it can not only ensure that the end member 3 moves strictly along the first direction, but also improve the bearing capacity. For another example, in other embodiments, the guide part in the guide mechanism can be a guide shaft 38, the guide shaft 38 is arranged along the first direction, the movable part in the guide mechanism can be a guide hole 42 adapted to the guide shaft 38, the guide hole 42 is sleeved on the guide shaft 38, the end member 3 is connected to a connecting member with the guide hole 42, or the guide hole 42 is directly constructed on the end member 3, and the end member 3 can also be ensured to move strictly along the first direction through the cooperation between the guide shaft 38 and the guide hole 42. For another example, the guide part in the guide mechanism can also be a guide groove constructed on the base 21, the guide groove is arranged along the first direction, the movable part in the guide mechanism can be a guide block adapted to the guide groove (such as a guide block of a T-shaped structure), the guide block is constrained by the guide groove and can move along the guide groove, and the end member 3 can be connected to the guide block, which can also achieve the same effect, and examples are not given one by one here.

[0060] During implementation, the folding device 2 also includes a linear drive module 25. The linear drive module 25 can be preferentially arranged along the first direction. The telescopic power 22 is connected to the linear drive module 25. The linear drive module 25 is connected to the end component 3, so that the telescopic power 22 can drive the end component 3 to move linearly along the first direction through the linear drive module 25. In order to adjust the position of the end component 3 along the first direction by using the telescopic power 22, the purpose of adjusting the length of the folding module 23 according to actual needs is achieved. During implementation, the linear drive module 25 can adopt an existing linear drive module 25. For example, the linear drive module 25 can adopt a screw 65 to drive the linear module or a synchronous belt 68 to drive the linear module or a gear rack to drive the linear module, etc. As an example, Figure 4 As shown, the linear drive module 25 adopts a screw-driven linear module, and the screw 65 drives the linear module including a screw 65 and a nut 64 adapted to the screw 65, the screw 65 is constructed with an external thread, the nut 64 is threadedly connected to the screw 65, the screw 65 can be set on the base 21 through a bearing seat, and the screw 65 is arranged along the first direction, the telescopic power 22 is transmission-connected with the screw 65, and is used to drive the screw 65 to rotate, the nut 64 is fixed to the end component 3, and the end component 3 is movably constrained by the guide mechanism, so that the telescopic power 22 can drive the end component 3 to move along the first direction through the screw 65.

[0061] In order to make the length of the folding device 2 adjustable, in one embodiment, one end member 3 in the folding device 2 is movably connected to the base 21, and the end member 3 can be connected to the telescopic power 22 through the above embodiment, so that the end member 3 can move along the first direction, and the other end member 3 can be fixedly installed on the base 21, so that the telescopic power 22 can drive one of the end members 3 to move to adjust the spacing between the two end members 3, thereby achieving the purpose of effectively adjusting the length of the folding device 2. In another embodiment, both end members 3 in the folding device 2 can be movably connected to the base 21. During implementation, the two end members 3 can share a set of guide mechanisms, or a set of guide mechanisms can be configured for each of the two end members 3. During implementation, only one telescopic power 22 can be configured, and the two end members 3 can be connected to the same telescopic power 22 in transmission, so that the telescopic power 22 can be used to drive the two end members 3 to move at the same time. Two telescopic powers 22 can also be configured, and the two telescopic powers 22 are respectively connected to the two end members 3 in transmission, so that the two end members 3 can be driven to move by the two telescopic powers 22. As an example, the two end parts 3 can be connected to the same set or multiple sets of guide mechanisms, so as to share one or more sets of guide mechanisms, so that the two end parts 3 can move along the first direction; when two telescopic powers 22 are configured, the two telescopic powers 22 can be respectively connected to the two end parts 3 through two linear drive modules 25, and the two end parts 3 are symmetrically arranged. The two telescopic powers 22 drive the two end parts 3 to move synchronously in the opposite direction, such as Figure 4 As shown, in order to effectively adjust the length of the folding device 2. As another example, the two end parts 3 can be connected to the same set or multiple sets of guide mechanisms, so as to share one or more sets of guide mechanisms, so that the two end parts 3 can move along the first direction; in the case of configuring a telescopic power 22, the linear drive module can include a screw 65 and two nuts 64 adapted to the screw 65, the screw 65 is constructed with two sections of external threads with opposite rotation directions, the two nuts 64 are respectively threadedly connected to the two sections of external threads, the telescopic power 22 is transmission-connected to the screw 65, and the two nuts 64 are respectively connected to the two end parts 3, so that the telescopic power 22 can be used to drive the two end parts 3 to move synchronously in the opposite direction, and can drive the middle folding part 4 to move synchronously, so as to achieve the purpose of effectively changing the length of the folding device 2. Of course, in other embodiments, the two end parts 3 can also be connected to different guide mechanisms respectively.

[0062] In order to enable the folding component 4 to move along the first direction, there are multiple implementation methods. As an example, each folding component 4 can be connected to the above-mentioned guide mechanism respectively. At this time, the guide mechanism needs to be configured with multiple movable parts so that the folding component 4 can be guided by the guide mechanism, that is, the guide mechanism can guide the folding component 4 and the end component 3 at the same time. For example, the guide part in the guide mechanism can adopt a guide rail 51, and the movable part adopts a slider 52 adapted to the guide rail 51. The guide mechanism is configured with multiple sliders 52 for the guide rail 51, and the end component 3 and each folding component 4 are respectively connected to different sliders 52, so that the end component 3 and each folding component 4 can strictly move along the first direction. As another example, the folding device 2 can also be configured with a set of independent guide mechanisms for each folding component 4, such as Figure 4 and Figure 5 As shown, that is, the guide mechanism of the end part 3 and the guide mechanism of the folding part 4 are independent of each other. When implemented, the structure of the guide mechanism of the folding part 4 can be the same as the guide mechanism of the end part 3. For example, the guide mechanism of the folding part 4 can include a guide part and a plurality of movable parts adapted to the guide part. The guide part is arranged along the first direction. The guide part can be a guide rail 51, a guide shaft 38, a guide groove, etc. Each movable part and the guide part respectively form a moving pair along the first direction. The movable part can be a slider 52, a guide hole 42, a guide block, etc. adapted to the guide part. Each folding part 4 is connected to the guide part through the cooperation of each movable part and the guide part. At this time, it can be understood that the elastic member 26 between the folding part 4 and the folding part 4 can also be arranged between two adjacent movable parts. Moreover, in the case where the guide part adopts a guide shaft 38, the elastic member 26 can also be sleeved on the guide shaft 38 to improve the stability of the elastic member 26 and avoid the problem of local sagging of the elastic member 26 due to gravity.

[0063] In order to facilitate the folding of the two sides (i.e., the long sides) of the bag openings 11 of different sizes along the length direction, during implementation, the side of the folding component 4 is constructed with a first folding structure 41 in a hook shape, and the first folding structure 41 is used to assist the folding of the long side of the bag opening 11, such as Fig. 9 and Fig.10As shown. In actual use, since the first folding structure 41 is constructed on the side of the folding part 4, the change in the spacing between the folding parts 4 will not affect and interfere with the first folding structure 41, and since the spacing between the folding parts 4 changes synchronously and evenly, the first folding structures 41 can cooperate with each other under different spacing conditions, and jointly assist the long sides of the bag openings 11 of different sizes to achieve the folding function. In one embodiment, the end part 3 can be used only to transmit power without the need for folding action and folding coordination. At this time, the lower end of the end part 3 should be higher than the lower end of the folding part 4 to avoid interfering with the folding action of the first folding structure 41. Based on this, in a further embodiment, a first folding structure 41 in the shape of a hook is also constructed on the end face of the folding component 4 at the end. At this time, the length of the folding module 23 is equal to the distance between the two folding components 4 at the end. Through the expansion and contraction of the folding module 23, the distance between the two folding components 4 at the end can be adapted to the bag openings 11 of different lengths, so that the first folding structure 41 constructed on the end face of the folding component 4 can fold the two wide sides of the bag opening 11. It can also be understood that at this time, the first folding structure 41 is constructed around the entire folding module 23, so as to meet the folding requirements of different lengths and different widths.

[0064] In another embodiment, the end member 3 is not only used to transmit power, but also can perform folding action and folding coordination. At this time, the end of the end member 3 away from the folding member 4 is configured with a hook-shaped second folding structure 31, such as Figure 6-Figure 8 As shown, the second folding structure 31 is used to assist the folding of the two ends of the bag opening 11. Specifically, during the folding process, the movement of the end member 3 can be used to drive the hook-shaped second folding structure 31 to move synchronously along the first direction, and the movement of the second folding structure 31 along the first direction can be used to drive the folding piece 14 at the end of the bag opening 11 to bend, so as to form a folded edge at the end of the bag opening 11 along the length direction, as shown in FIG. Figure 4 As shown, since the spacing between the two end parts 3 is adjustable, the second folding structure 31 on the end part 3 can be used to assist the folding pieces at both ends of the bag opening 11 of different sizes to bend and form folds during the bag opening process to meet the folding requirements of any size. In this case, the folding requirements of the bag openings 11 of different widths and lengths can be met at the same time. In implementation, the lower end of the end part 3 can be flush with the lower end of the folding part 4, as shown in FIG. Figure 4 As shown, the second folding structure 31 is adapted to the first folding structure 41, so that the second folding structure 31 and the first folding structure 41 are adapted to each other, which can effectively prevent the folding actions in the two directions from interfering with each other, making the folding actions in the two directions more coordinated. For example, the first folding structure 41 can be the same as the second folding structure 31, such as Fig. 9 and Fig.10 shown.

[0065] In this embodiment, the first hem structure 41 may include a positioning surface 33 located on the inner side and a raised portion 34 protruding from the positioning surface 33, and the raised portion 34 is configured with a limiting surface 35 for limiting the hem piece 14, such as Figure 8 and Fig. 9 As shown, the positioning surface 33 and the limiting surface 35 form a hook shape. Figure 6-Figure 8 As shown, the second folding structure 31 may also include a positioning surface 33 located on the inner side and a protruding portion 34 protruding from the positioning surface 33, as shown in FIG. Figure 6-Figure 8 As shown, that is, in the direction away from the folding part 4, the protrusion 34 is located on the outside of the positioning surface 33, and the protrusion 34 is located at the lower end of the positioning surface 33, as shown in FIG. Figure 6-Figure 8 As shown, at the same time, the protrusion 34 is configured with a limiting surface 35 for limiting the folding piece 14, so that the positioning surface 33 and the limiting surface 35 form a hook shape, so as to cooperate with the corresponding folding process to realize the folding function.

[0066] In implementation, the positioning surface 33 can be configured as a vertical plane, such as Figure 6-Figure 8 As shown, in addition, the positioning surface 33 can also be constructed as an inclined surface inclined to the vertical direction. Of course, the positioning surface 33 can also be constructed as an arc surface. The positioning surface 33 is mainly used to locate the folding position. The positioning surfaces 33 on the two end parts 3 correspond to each other, and the positioning surfaces 33 on the two sides of the folding part 4 also correspond to each other. In implementation, the distance between the two positioning surfaces 33 in the two end parts 3 can be used as the length of the folding module 23 along the first direction, and the length can be adjusted by the telescopic power 22, so that the length is adapted to bag openings 11 of different sizes to meet the bag opening requirements of bag openings 11 of different sizes. In implementation, the limiting surface 35 can preferably adopt a plane. When the positioning surface 33 adopts a vertical plane, the two are perpendicular to each other, such as Figure 6-Figure 8 As shown, a better folding effect can be achieved. In addition, the limiting surface 35 can also be a curved surface or an inclined surface inclined to the horizontal direction. In implementation, the limiting surface 35 can be a single surface or a combination of multiple surfaces. In implementation, the limiting surface 35 in the first folding structure 41 can be flush with the limiting surface 35 in the second folding structure 31, such as Fig. 9 and Fig.10 As shown, it is beneficial to perform hemming actions in two directions at the same height, thereby simplifying the bag opening process.

[0067] In a more perfect embodiment, the outer side surface of the protrusion 34 in the first folding structure 41 is further configured with a guide surface 36, and the guide surface 36 extends to the lower end of the folding part 4, and the width of the folding part 4 gradually decreases from the upper edge of the guide surface 36 to the lower end of the folding part 4. Fig. 9 and Fig.10As shown, the folding component 4 is formed into a structure with a small lower end and a large upper end along the width direction of the folding module 23, and the resistance when the folding module 23 is inserted into the fabric 1 can also be reduced. Similarly, the outer side surface of the protrusion 34 in the second folding structure 31 is also configured with a guide surface 36, such as Figure 5-Figure 8 As shown, the guide surface 36 extends to the lower end of the end member 3, and the thickness of the end member 3 along the first direction gradually decreases from the upper edge of the guide surface 36 to the lower end of the end member 3. Figure 7 As shown, a structure with a small lower end and a large upper end is formed along the length direction of the folding module 23, which can reduce the resistance when the folding module 23 is inserted into the fabric 1, prevent the insertion action from driving the fabric 1 to move and cause errors, and facilitate faster and more accurate realization of the bag opening function.

[0068] In a further embodiment, the side of the end member 3 is also configured with a third folding structure 32 in a hook shape, the third folding structure 32 is adapted to the first folding structure 41, and the third folding structure 32 is used to assist the long side of the bag opening 11 in folding. Figure 5-Figure 8 As shown, the third folding structure 32 on the side of the end component 3 can cooperate with the first folding structure 41 on the side of the folding component 4, so as to form a folding structure with a longer size and a more continuous structure on the side of the entire folding module 23, which can not only meet the folding requirements of the long sides of the bag openings 11 of different sizes, but also help to achieve better folding functions and better folding effects. In implementation, the third folding structure 32 can be connected to the second folding structure 31, and the structure of the third folding structure 32 can be the same as the second folding structure 31 or the first folding structure 41. For example, the third folding structure 32 also includes a positioning surface 33 and a protruding portion 34 protruding from the positioning surface 33, such as Figure 4 and Figure 5 As shown, the protrusion 34 is configured with a limiting surface 35 for limiting the hemming piece 14, and the limiting surface 35 in the third hemming structure 32 can be flush with the limiting surface 35 in the second hemming structure 31 and the limiting surface 35 in the first hemming structure 41, as shown in FIG. Figure 4-Figure 10 As shown, the positioning surface 33 in the third folding structure 32 can be flush with the positioning surface 33 in the first folding structure 41 and perpendicular to the positioning surface 33 in the second folding structure 31, which is conducive to performing folding actions in two directions at the same height, thereby simplifying the bag opening process. At the same time, the outer side surface of the protrusion 34 in the third folding structure 32 is also configured with a guide surface 36, which extends to the lower end of the end member 3. From the upper edge of the guide surface 36 to the lower end of the end member 3, the width of the end member 3 gradually decreases, as shown in FIG. Figure 5 and Figure 8 As shown, the end part 3 is formed into a structure with a small lower end and a large upper end along the width direction of the folding module 23, and the resistance when the folding module 23 is inserted into the fabric 1 can also be reduced.

[0069] Example 2 In the folding device 2 provided in this embodiment, the two end parts 3 are respectively movably connected to the base 21, and the two end parts 3 are symmetrically arranged. The telescopic power 22 drives the two end parts 3 to move synchronously in opposite directions, so that the folding module 23 can be driven to be telescoped with the middle position of the two end parts 3 as the center, so as to achieve the purpose of adjusting the length of the folding module 23 with the middle position of the two end parts 3 as the center. In this way, in actual use, not only the action can be simplified and the number of positioning times can be reduced, thereby effectively simplifying the folding process and improving the folding efficiency, but also the folding accuracy can be improved.

[0070] In one embodiment, the folding device 2 is configured with two telescopic powers 22, and the two telescopic powers 22 are respectively connected to the two end parts 3 through two linear drive modules 25, and the two end parts 3 are driven to move synchronously in the opposite direction through the synchronous action of the two telescopic powers 22, such as Figure 4 The linear drive module 25 can be implemented by using the above-mentioned technology, which will not be described in detail here.

[0071] In the preferred embodiment provided in this embodiment, the folding device 2 is equipped with a telescopic power 22, the linear drive module 25 includes a rotating shaft 61 and two nuts 64, the rotating shaft 61 includes an intermediate shaft section 62 and a screw rod 65 section 63 connected to both ends of the intermediate shaft section 62, as shown in FIG. Fig.11 and Fig.12 As shown, the threads of the two screw rods 65 and 63 are in opposite directions, and the screw rods 65 and 63 are respectively threadedly connected with nuts 64, and the two nuts 64 are respectively connected to the two end parts 3, as shown in FIG. Fig.11 and Fig.12 As shown, the telescopic power 22 is connected to the intermediate shaft section 62 in a transmission manner, so that the telescopic power 22 can be used to drive the rotating shaft 61 to rotate, so that the rotation of the rotating shaft 61 can drive the two nuts 64 to move synchronously in the opposite direction, and then the two end parts 3 can be driven to move synchronously in the opposite direction, so as to achieve the purpose of adjusting the length of the hemming module 23 with the middle position of the two end parts 3 as the center. In implementation, the telescopic power 22 can be preferably connected to the intermediate shaft section 62 through a gear transmission mechanism or a belt transmission mechanism. For example, Fig.11 and Fig.12 As shown, the output shaft of the telescopic power 22 is provided with a driving pulley 66, and the intermediate shaft section 62 is provided with a driven pulley 67. A synchronous belt 68 is tensioned between the driving pulley 66 and the driven pulley 67, so that the telescopic power 22 can be used to drive the rotating shaft 61 to rotate forward or reverse.

[0072] In order to ensure that the fabrics 1 of different thicknesses can be folded smoothly and the folding effect can be ensured, in a further embodiment, a sinking groove 37 is further constructed on one side of the limiting surface 35 of the second folding structure 31 close to the positioning surface 33, such as Fig.15Similarly, the first folding structure 41 of the limiting surface 35 near the positioning surface 33 of the side is also structured with a sinking groove 37, such as Fig.15 and Fig.16 The third folding structure 32 of the limiting surface 35 near the side of the positioning surface 33 is also configured with a sinking groove 37, such as Fig.16 As shown, not only can the area of ​​the first limiting surface 35 be reduced, thereby reducing the friction during the folding process, but also an accommodating space can be formed near the positioning surface 33, so that fabrics 1 of different thicknesses can be bent smoothly and achieve the desired bending effect.

[0073] Example 3

[0074] The main difference between this embodiment 4 and the above-mentioned embodiments is that in the folding device 2 provided in this embodiment, the guide mechanism includes a guide shaft 38 and a guide hole 42 adapted for the guide shaft 38, the guide shaft 38 is arranged along the first direction, the guide hole 42 is constructed on the folding component 4, and the folding component 4 is sleeved on the guide shaft 38 through the guide hole 42, so that the folding component 4 can form a sliding fit with the guide shaft 38 through the guide hole 42, and the guide shaft 38 can not only be used to support the folding component 4, but also can be used to guide the movement of the folding component 4, thereby improving the movement accuracy.

[0075] In implementation, the guide shaft 38 can be fixed to the base 21, and in order to further improve the movement accuracy of the folding component 4, in another embodiment, the guide shaft 38 can be installed on one of the end components 3, and at the same time, the other end component 3 is also configured with a guide hole 42 adapted to the guide shaft 38, and the guide shaft 38 passes through each guide hole 42, such as Figure 11-Figure 14 As shown, by directly installing the guide shaft 38 on the end member 3, the end member 3 is used as the positioning reference of the guide shaft 38, so that the end member 3 and the guide shaft 38 move synchronously, and the folding member 4 moves along the guide shaft 38, thereby eliminating the error caused by the different positioning references, which is conducive to further improving the movement accuracy of the folding member 4. In implementation, the number of shafts can be determined according to actual needs, and can be one, two, three, etc., and in order to further improve the movement accuracy of the folding member 4, in one embodiment, each end member 3 is respectively installed with at least one guide shaft 38, and each guide shaft 38 is parallel to each other, such as Figure 11-Figure 14 As shown, the guide shafts 38 installed on different end parts 3 can be staggered with each other, so that at least two guide shafts 38 can be used to guide the movement process of the folding part 4 and the end part 3 at the same time, thereby further improving the movement accuracy. At this time, the elastic member 26 can be sleeved on the guide shaft 38, such as Figure 11-Figure 14 As shown, the guide shaft 38 is used to support the elastic member 26, and the elastic force direction of the elastic member 26 can be ensured to be consistent with the first direction, thereby effectively improving the stability of the elastic member 26. In this embodiment, the elastic member 26 is a conical spring, such as Figure 11-Figure 14 As shown, the conical spring can be compressed into a flat shape so that the distance between two adjacent folding parts 4 is greatly reduced when compressed to the extreme position, making the structure of the entire folding module 23 more compact and smaller in size, and can meet the needs of larger bag openings 11 while meeting the needs of smaller bag openings 11.

[0076] In a further embodiment, one side or both sides of the folding part 4 are configured with a groove 43 adapted to fit the elastic member 26, such as Fig.16 As shown, the groove 43 is communicated with the guide hole 42. Similarly, one side of the end part 3 is constructed with a groove 43 adapted to the elastic member 26, and the groove 43 is communicated with the guide hole 42; the groove 43 is used to accommodate at least part of the elastic member 26, so that when the length of the folding module 23 is reduced, the elastic member 26 can be received in the corresponding groove 43, so that two adjacent folding parts 4 can contact each other, and adjacent folding parts 4 and the end part 3 can contact each other, so that the minimum length of the folding module 23 can be shorter, so as to meet the requirements of opening bags of smaller sizes.

[0077] Example 4

[0078] This embodiment provides a bag opening device, including a frame 7 and the folding device 2 in the above embodiment. The base 21 of the folding device 2 can be connected to the frame 7, such as Fig.17 As shown, the folding device 2 can be used to meet the folding requirements of bag openings 11 of different sizes.

[0079] During implementation, the folding device 2 can be configured to be vertically lifted along the frame 7 so as to cooperate with the folding frame pressing device 8 to perform the folding action. As an example, as shown in the figure, it also includes a lifting power 24, a linear drive module 25 and a base 221. The base 21 can be connected to the base 221 through a linear guide rail 51 (including a guide rail 51 and a slider 52) arranged in the vertical direction. The base 221 is connected to the frame 7. The lifting power 24 can be fixed to the base 221 and connected to the base 21 through a linear drive module 25 arranged in the vertical direction. The linear drive module 25 can be a screw-nut mechanism or a gear-rack mechanism or a belt drive mechanism. As shown in the figure, the height of the folding device 2 in the vertical direction can be adjusted by the lifting power 24.

[0080] In a more complete solution, a control module is also included, and the control module is electrically connected to the telescopic power 22 and the lifting power 24.

[0081] In a more complete solution, the bag opening device further includes a folding frame pressing device 8 adapted to the folding device 2, wherein the folding frame pressing device 8 is used to constrain the fabric 1 and to clamp the folding piece 14 so as to sew the folded edge later.

[0082] In implementation, the folding device 2 can be arranged above the folding frame pressing device 8, such as Fig.17 As shown, the folding frame device 8 is equipped with two groups of folding forming modules 81, each group of folding forming modules 81 includes two folding forming modules 81 arranged opposite to each other, and the two groups of folding forming modules 81 are arranged crosswise, so that the four folding forming modules 81 form a rectangle, so as to assist the folding of the four sides of the bag opening 11. For example, the folding forming module 81 includes a lower pressing plate 82, an upper pressing plate 83 and a pull plate 84, as shown in FIG. Fig.18 As shown, the pull-out plate 84 is arranged between the lower pressing plate 82 and the upper pressing plate 83. The lower pressing plate 82 can be an elastic plate so as to use its own elastic force to press the fabric 1 downward; the pull-out plate 84 can move horizontally under the drive of the pull-out power. For example, the pull-out power can be a cylinder, and the pull-out plate 84 is connected to the pull-out power so as to use the cylinder to drive the pull-out plate 84 to extend and retract; the upper pressing plate 83 can press the fabric 1 upward under the drive of the upper pressing power. For example, the upper pressing power can be a cylinder, and the upper pressing plate 83 is connected to the upper pressing power so as to use the upper pressing power to drive the upper pressing plate 83 to move up and down so as to compress or decompress the hemming sheet 14. In implementation, each lower pressing plate 82 can be independent of each other or connected as a whole.

[0083] The process flow of opening a bag using the bag opening device includes: step 1, horizontally clamping the fabric 1 between the lower pressing plate 82 and the drawing plate 84, such as Fig.18 As shown, at this time, the required gap has been cut in advance in the pocket area 12 on the fabric 1. Step 2, adjust the relative positions of the folding device 2 and the folding frame pressing device 8 so that the folding device 2 corresponds to the pocket area 12 below, and the center of the folding device 2 preferably coincides with the center of the pocket area 12, as shown in FIG. Fig.18 Step 3, according to the length of the bag opening 11, the length of the folding device 2 is adjusted by the telescopic power 22, so that the length of the folding device 2 is smaller than the length of the bag opening 11, as shown in FIG. Fig.18 Step 4, adjust the relative positions of the folding device 2 and the folding frame device 8 so that the lower end of the folding device 2 is inserted into the pocket area 12 until the plane where the fabric 1 is located corresponds to the positioning surface 33, and the protrusion 34 is located below the fabric 1, as shown in FIG. Fig.19 Step 5, according to the length of the bag opening 11, the length of the folding device 2 is adjusted again by the telescopic power 22, so that the folding device 2 is extended until the length of the folding device 2 (the length can be the distance between the two positioning surfaces 33 on the end surfaces of the two end parts 3) is adapted to the length of the bag opening 11, as shown in FIG. Fig. 20As shown, at this time, the second folding structures 31 at both ends of the folding module 23 correspond to the two wide sides of the bag opening 11 respectively, and the folding structure composed of the first folding structure 41 and the third folding structure 32 on the side of the folding module 23 is just adapted to the wide side of the bag opening 11, and in this process, the folding pieces 14 at both ends of the bag opening area 12 are squeezed by the positioning surface 33 and constrained by the limiting surface 35, so that the folding pieces 14 are automatically bent, as shown in FIG. Fig. 20 As shown, at this time, the pull-out plate 84 corresponds to the bent edge sheet 14. Step 6, control the pull-out plate 84 to move inward, and use the pull-out plate 84 to push the edge sheet 14 against the positioning surface 33, as shown in FIG. Fig.21 Step 7, adjust the relative positions of the folding device 2 and the folding frame pressing device 8, so that the folding device 2 moves upward relative to the folding frame pressing device 8, driving the protrusion 34 to press the folding sheet 14 against the pull-out plate 84, as shown in FIG. Fig. 22 As shown, a more perfect hem can be formed through this step, and at this time, the outer edge of the hem piece 14 is outside the raised portion 34, as shown in FIG. Fig. 22 Step 8, the upper pressing plate 83 is driven by the upper pressing force to clamp the hemming sheet 14, as shown in FIG. Fig.23 Step 9, driving the draw plate 84 to move in the opposite direction by the pulling power, so that the draw plate 84 exits the folding device 2, as shown in FIG. Fig.24 As shown, the folding work of the two wide sides of the bag opening 11 is completed. Similarly, the folding work of the two long sides of the bag opening 11 can also be completed by adopting the same process flow as above. When the folding is completed, the length of the folding device 2 is adjusted by the telescopic power 22 so that the length of the folding device 2 is smaller than the length of the bag opening 11, as shown in FIG. Fig.25 As shown, the folding device 2 is moved upward relative to the folding frame pressing device 8, and the fabric 1 and the folding frame pressing device 8 are withdrawn.

[0084] The above description is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention.

Claims

1. A folding device, characterized in that: It includes a base, a telescopic power and a folding module, wherein the folding module includes a folding component, an elastic component and two end components, wherein: The two end components are arranged opposite to each other, at least one end component is movably connected to the base, and the moving direction of the end component is a first direction; Each folding component is movably arranged between the two end components, and the moving direction of the folding component is the first direction. The elastic member is arranged between at least two adjacent folding components, and the side surface of each folding component is respectively constructed with a first folding structure in a hook shape; The end component is drivingly connected to the adjacent folding component; The telescopic power is installed on the base and is connected to the movable end parts in a transmission manner. The telescopic power is used to adjust the distance between the two end parts. When the two end parts are close to each other, the elastic potential energy of the elastic part increases, and when the end parts are away from each other, the elastic potential energy of the elastic part decreases.

2. The folding device according to claim 1, characterized in that: A first hook-shaped folding structure is also constructed on the end surface of the folding component located at the end.

3. The folding device according to claim 1, characterized in that: The end of the end component facing away from the folding component is configured with a second folding structure in a hook shape, and the second folding structure is adapted to the first folding structure; And / or, the side surfaces of the end parts are respectively constructed with a third folding structure in a hook shape, the third folding structure is adapted to the first folding structure, and the third folding structure is used for auxiliary folding.

4. The folding device according to claim 3, characterized in that: The second folding structure comprises a positioning surface and a raised portion protruding from the positioning surface, the raised portion is configured with a limiting surface for limiting the folding piece, and the positioning surface and the limiting surface form a hook shape; The first folding structure comprises a positioning surface and a raised portion protruding from the positioning surface, the raised portion is configured with a limiting surface for limiting the folding piece, and the positioning surface and the limiting surface form a hook shape; The third folding structure comprises a positioning surface and a raised portion protruding from the positioning surface, the raised portion is configured with a limiting surface for limiting the folding piece, and the positioning surface and the limiting surface form a hook shape; The positioning surface of the third folding structure is adapted to the positioning surface of the first folding structure, and the limiting surface of the third folding structure is adapted to the limiting surface of the first folding structure.

5. The folding device according to claim 1, characterized in that: It also includes a guiding mechanism, which includes a guiding part and a plurality of movable parts adapted to the guiding part, the guiding part is arranged along a first direction, and each movable part respectively forms a moving pair along the first direction with the guiding part, and each folding part is respectively connected to the guiding part through the cooperation between each movable part and the guiding part.

6. The folding device according to claim 5, characterized in that: The guide part adopts a guide shaft, and the guide shaft is arranged along the first direction. The movable part is a guide hole adapted to the guide shaft, and the guide hole is configured in the folding part, and the folding part is sleeved on the guide shaft through the guide hole; the guide shaft is installed on one of the end parts, and the other end part is configured with a guide hole adapted to the guide shaft, and the guide shaft passes through the guide hole; the elastic member is sleeved on the guide shaft; And / or, the elastic member is a conical spring or a cylindrical helical compression spring.

7. The folding device according to claim 1, characterized in that: It also includes a guide mechanism, the guide mechanism includes a guide portion and a movable portion adapted to the guide portion, the guide portion is arranged along a first direction, the movable portion is movably constrained to the guide portion, the guide portion is connected to the base, and the movable end member is connected to the movable portion; It also includes a linear drive module arranged along the first direction, the telescopic power transmission is connected to the linear drive module, and the linear drive module transmission is connected to the end component.

8. The folding device according to claim 7, characterized in that: The two end parts are movably connected to the base respectively, and the two end parts are symmetrically arranged. The telescopic power drives the two end parts to move synchronously in opposite directions.

9. The folding device according to claim 8, characterized in that: The linear drive module includes a rotating shaft and a nut. The rotating shaft includes an intermediate shaft section and a screw rod section connected to both ends of the intermediate shaft section. The threads of the two screw rod sections have opposite rotation directions. The screw rod sections are respectively threadedly connected with nuts, which are connected to the end parts. The telescopic power is transmission-connected to the intermediate shaft section.

10. A bag opening machine, characterized in that: It comprises a frame and the folding device described in any one of claims 1 to 9, wherein the folding device is connected to the frame.

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