Edge folding device and bag opening equipment

Abstract

The utility model relates to an edgefold device and bag opening equipment, including bracing frame, two edgefold component, motor and lead screw-nut mechanism, lead screw-nut mechanism includes lead screw and nut, lead screw is equipped with two sections of external thread with opposite turning direction, two nut is respectively threaded connection with two sections of external thread, nut is equipped with connecting ring, the connecting ring is equipped with the motor, the motor is equipped with the motor. The connecting ring is provided with a connecting part, the two edge folding components are movably connected to the supporting frame, each edge folding component is provided with a connecting round hole, a matching part and a first edge folding structure, the connecting part is arranged in the circumferential direction of the threaded hole or the matching part is arranged in the circumferential direction of the connecting round hole, and the motor is in transmission connection with the lead screw. The nut is fixed to the edge folding component through a fastener matched with the connecting part or the matching part. According to the edge folding device, the position and the direction of the nut can be conveniently and accurately adjusted, the nut can be rapidly and efficiently installed at the preset position, it is guaranteed that the two edge folding components are symmetrically arranged, and therefore the bag opening precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of bag opening equipment, and particularly relates to a hemming device and a bag opening equipment. Background Technique

[0002] Bag opening equipment (or called bag opening machine, bag opening sewing machine, etc.) is an essential auxiliary processing machine in the clothing processing process, mainly used for sewing parts such as pockets and zippers in the clothing and luggage industries, and is widely used in the sewing industry.

[0003] The existing bag opening equipment usually includes a cutting device, a sewing device, a hemming device, and a pressing frame device adapted to the hemming device, etc. Among them, the pressing frame device is mainly used to tension and transfer the fabric, and the hemming device is mainly used to realize the hemming function on the fabric, and a bag mouth is formed through the cooperation of the hemming device and the pressing frame device. The bag mouth is usually a long strip structure, such as Figure 3As shown, the cutting device is mainly used for cutting fabrics, and the sewing device is mainly used for sewing fabrics. The existing bag opening process usually includes cutting, folding (or bag folding), sewing and other processes, wherein the folding process is usually achieved by a folding device, and the existing folding device is usually equipped with two folding parts arranged opposite to each other, and each folding part is respectively equipped with a separate folding power, which is connected to the corresponding folding part in a transmission manner. Initially, the two folding components are respectively at the positions where the distance between them is shortest, and the bag opening process generally includes the following steps: Step 1, cutting a seam that fits the bag opening in the bag opening area to form a foldable folded edge in the bag opening area; Step 2, moving the folding device to the position corresponding to the bag opening area, and inserting the folding component into the seam in the bag opening area; Step 3, using the folding power to drive the folding component to move in opposite directions away from each other, and using the movement of the folding component to drive the folding piece on the corresponding side to be folded to the inner side of the fabric to form the desired bag opening shape; Step 4, constraining the folded edge to maintain the state of the folded edge for subsequent sewing; Step 5, using the folding power to drive the folding component to return to the initial position so as to exit the bag opening area. The existing folding parts are usually constructed as L-shaped structures. For example, a bag mouth folding mechanism for clothing bag opening processing disclosed in Chinese patent CN212655959U, a bag folding mechanism for bag opening equipment disclosed in Chinese patent CN 218026643 U, etc., all use L-shaped folding parts, and need to be configured with four folding parts, and need to be configured with a folding power for each of the four folding parts, resulting in a relatively complex structure of the entire folding device, high cost, and large volume, which is not conducive to the miniaturization of the folding device. In order to solve this technical problem, a motor and a screw-nut mechanism are configured in the folding device. The motor drives the two relative folding parts to move synchronously in the opposite direction through the screw-nut mechanism, so as to achieve the effect of driving the two folding parts to open and approach each other; the folding device of this structure can reduce the amount of folding power, which is conducive to simplifying the structure, reducing costs and reducing volume.

[0004] Since in the above step three, the folding device usually corresponds to the center position of the middle seam in the bag opening area, in order to improve the bag opening accuracy, the two relative folding parts should be symmetrically arranged along the center of the seam, so that they can be synchronously moved in opposite directions by the same distance under the drive of the motor to ensure that the folding amount on both sides of the bag opening is the same, and there will be no problem of large folding amount on one side and small folding amount on the other side. However, it is found in actual application that due to the limitations of the existing nut mounting structure, it is difficult to symmetrically install the two relative folding parts during assembly, especially under the influence of manufacturing errors, assembly errors and other factors, it is difficult to ensure that the two relative folding parts are symmetrically connected to the screw-nut mechanism, so that it is easy to have a large folding amount on one side and a small folding amount on the other side, which seriously affects the bag opening accuracy and needs to be solved urgently. Utility Model Content

[0005] In the first aspect of the present utility model, to solve the above technical problems, a hemming device is provided, which is very convenient for adjusting the position and orientation of the nut. It can not only quickly and efficiently install the nut at a predetermined position, but also is conducive to ensuring the symmetrical arrangement of the two hemming components, thereby being conducive to improving the bag opening accuracy. The main concept is as follows:

[0006] A hemming device includes a support frame, two hemming components, a motor, and a lead screw-nut mechanism. Among them,

[0007] The lead screw-nut mechanism includes a lead screw and nuts. The lead screw is configured with two external threads with opposite helix directions. The nuts are configured with threaded holes adapted to the lead screw. The two nuts are respectively threadedly connected to the two external threads. One end of the nut is configured with a connecting ring, and the connecting ring is configured with a connecting portion.

[0008] The two hemming components are arranged oppositely and are respectively movably connected to the support frame. The hemming components are configured with connecting round holes adapted to the nuts, cooperating portions adapted to the connecting portions, and a first hemming structure in a hook shape. The connecting portion is arranged along the circumferential direction of the threaded hole or the cooperating portion is arranged along the circumferential direction of the connecting round hole.

[0009] The motor is drivingly connected to the lead screw. The nut is inserted into the connecting round hole and fixed to the flanging component by a fastener that fits the connecting portion or the mating portion. In this solution, by drivingly connecting the motor to the lead screw and constructing external threads with opposite helix directions at both ends of the lead screw, at the same time, threadedly connecting two nuts to the two external threads respectively, and fixing the two nuts to the two flanging components respectively, so as to drive the two flanging components to move synchronously and in opposite directions by the motor, achieving the purpose of driving the two flanging components to open and approach each other; by constructing a connecting round hole on the flanging component that fits the nut, not only can the nut be inserted into the connecting round hole, but also the nut can be manually rotated to adjust the position of the nut and the flanging component connected thereto; by constructing a connecting ring at one end of the nut and a connecting portion on the connecting ring, at the same time, constructing a mating portion on the flanging component that fits the connecting portion, so that the nut can be fixed to the flanging component by a fastener that fits the connecting portion or the mating portion, achieving the purpose of fixing the nut; by arranging the connecting portion along the circumferential direction of the threaded hole or arranging the mating portion along the circumferential direction of the connecting round hole, on the one hand, during assembly, the position and orientation of the nut can be conveniently and precisely adjusted as needed, which is beneficial to ensuring that the two opposite flanging components are symmetrically connected to the lead screw-nut mechanism; on the other hand, it ensures that the connecting portion and the mating portion of the nuts at different orientations are in a mutually matching state, so that the position of the nut can be quickly fixed by a fastener after the adjustment is in place, thereby making the flanging device very convenient for adjusting the position of the flanging component, and can quickly and efficiently install the two flanging components to the predetermined position, and is beneficial to improving the bag opening accuracy. In addition, compared with the existing flanging devices, the structure of this flanging device is more simplified, the cost is lower, the volume is smaller, and it better meets the market demand.

[0010] To solve the problem of facilitating the adjustment of the nut orientation, in some preferred solutions, the connecting portion includes a plurality of through holes, and the through holes are respectively evenly distributed along the circumferential direction of the threaded hole; the mating portion is a screw hole that fits the through hole. By constructing the connecting portion to include a plurality of through holes, when assembling the nut and adjusting the nut orientation, the through holes can be aligned with the screw holes, ensuring that the nut after the adjustment is in place can be fixed to the flanging component by a fastener that fits the screw hole.

[0011] Preferably, the through hole is a round hole.

[0012] To solve the problem of facilitating the adjustment of the nut orientation, in some preferred solutions, the connecting portion includes at least two slotted holes, the slotted holes are arc-shaped structures, and the through holes are respectively evenly distributed along the circumferential direction of the threaded hole; the mating portion is a screw hole that fits the slotted hole. By constructing the connecting portion to include at least two slotted holes, when assembling the nut and adjusting the nut orientation, the screw holes can be aligned with the slotted holes, ensuring that the nut after the adjustment is in place can be fixed to the flanging component by a fastener that fits the screw hole.

[0013] Preferably, the fitting portion includes at least two screw holes, and the screw holes are evenly distributed along the circumferential direction of the connecting circular hole, so as to fix the nut more firmly.

[0014] To solve the problem of facilitating the adjustment of the nut orientation, in some preferred solutions, the fitting portion includes a plurality of through holes, and the through holes are evenly distributed along the circumferential direction of the connecting circular hole; the connecting portion is a screw hole adapted to the through hole, and the through hole is a circular hole or a slotted hole. By constructing the fitting portion to include a plurality of through holes, when assembling the nut and adjusting the nut orientation, the through holes can be aligned with the screw holes, ensuring that the nut after adjustment can be fixed to the hemmed component through a fastener adapted to the screw hole.

[0015] To simplify the control, further, the two nuts are symmetrically arranged along the center of the lead screw. The two hemmed components connected to the nuts can be symmetrically arranged along the center of the lead screw, so that during the bag opening process, by aligning the center of the lead screw with the center of the middle seam of the bag mouth area, it can be ensured that the two hemmed components are exactly symmetric with respect to the center of the seam, which is not only simpler but also can ensure that the hemmed amounts at both ends of the bag mouth are the same.

[0016] Preferably, a transmission portion is provided at the middle position of the lead screw, and the two external threads are symmetrically constructed on both sides of the transmission portion, and the motor is in transmission connection with the transmission portion.

[0017] Preferably, the transmission portion is a driven gear or a driven pulley.

[0018] Preferably, the motor is fixed to the support frame, the output shaft of the motor is in transmission connection with the driving pulley, and a transmission belt is tensioned between the driving pulley and the transmission portion, so that the motor can drive the lead screw through the belt transmission mechanism.

[0019] To solve the problem of improving the movement accuracy of the hemmed component, further, a guiding mechanism is further included, and the hemmed component is connected to the support frame through the guiding mechanism. This not only enables the hemmed component to move relative to the support frame, but also ensures that the hemmed component moves strictly along a straight line, thereby effectively improving the movement accuracy of the hemmed component and achieving the purpose of improving the bag opening accuracy.

[0020] Preferably, the guiding mechanism adopted is a guide rail slider mechanism.

[0021] In the second aspect of the present utility model, to solve the problem of meeting the hemmed requirements of bag mouths with different lengths, further, at least two intermediate components are further included, wherein

[0022] The hemmed component is configured with a guiding hole and a guiding rod adapted to the guiding hole. The guiding rod of one hemmed component passes through the guiding hole of the other hemmed component, and the two guiding rods are parallel to each other;

[0023] On both sides of each intermediate component, a second flanging structure in the shape of a hook is respectively constructed. Each intermediate component is respectively constructed with a sliding hole adapted to the guide rod. The intermediate component is sleeved on the guide rod through the sliding hole, and each intermediate component is arranged in columns between the two flanging components;

[0024] Elastic components are respectively arranged between two adjacent intermediate components, and elastic components are arranged between the flanging component and the intermediate component;

[0025] When the two flanging components approach each other, they synchronously drive the intermediate components to approach each other, and the elastic potential energy of the elastic component increases. When the two flanging components move away from each other, the elastic component releases the elastic potential energy and synchronously drives each intermediate component to move away from each other. In this solution, by configuring intermediate components between the two flanging components and respectively constructing a second flanging structure in the shape of a hook on both sides of the intermediate component, so as to use the second flanging structure to assist in flanging the long side of the bag mouth, this flanging device only needs to configure one motor to realize the flanging work in two directions of the bag mouth; by respectively arranging elastic components between the two intermediate components, so as to use the elastic components to play a lateral transmission force, so that the change in the distance between the two flanging components can synchronously drive the change in the distance between the intermediate components, not only making each intermediate component evenly distributed between the two flanging components in any state, which is more conducive to flanging, but also can automatically adapt to different lengths of bag mouths by combining each second flanging structure, with better versatility.

[0026] An open-bag device includes a frame and the above-mentioned flanging device, and the flanging device is installed on the frame.

[0027] Compared with the prior art, for a flanging device and an open-bag device provided by the present utility model, during assembly, the position and orientation of the nut can be conveniently and precisely adjusted as needed. Not only can the nut be quickly and efficiently installed at the predetermined position, but also it is beneficial to ensure the symmetrical arrangement of the two flanging components, thereby being beneficial to improving the open-bag accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0029] Figure 1 It is one of the structural schematic diagrams of a flanging device provided in Embodiment 1 of the present utility model.

[0030] Figure 2 It is for Figure 1 the right view of

[0031] Figure 3 is the front view of Figure 1 .

[0032] Figure 4 One of the schematic structural diagrams of a nut in a hemming device provided in Embodiment 1 of the present utility model.

[0033] Figure 5 Another schematic structural diagram of a nut in a hemming device provided in Embodiment 1 of the present utility model.

[0034] Figure 6 The partial structural schematic diagram of the hemming component in a hemming device provided in Embodiment 1 of the present utility model.

[0035] Figure 7 is the Figure 3 cross-sectional view at A-A in

[0036] Figure 8 The front view of another nut in a hemming device provided in Embodiment 1 of the present utility model.

[0037] Figure 9 is the Figure 8 partial structural schematic diagram after the nut is installed on the hemming component in

[0038] Figure 10 The structural schematic diagram of a hemming device provided in Embodiment 2 of the present utility model.

[0039] Figure 11 is the Figure 10 front view, at this time, the two hemming components are in the initial state.

[0040] Figure 12 is the Figure 10 front view, at this time, the two hemming components are in the unfolded state.

[0041] Marking description in the figure: support frame 1; hemming component 2, first hemming structure 21, connecting round hole 22, screw hole 23, guiding hole 24, guiding rod 25; motor 3, driving pulley 31, transmission belt 32, screw-nut mechanism 33; screw rod 4, driven gear 41, external thread 42; nut 5, threaded hole 51, connecting ring 52, through hole 53, slotted hole 54; guide rail 61, slider 62; intermediate component 7, second hemming structure 71; elastic component 8; fastener 9. Detailed implementation manners

[0042] Next, in combination with the accompanying drawings in the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Usually, the components of the embodiments of the present utility model described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model to be protected, but only represents the selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present utility model.

[0043] Embodiment 1

[0044] In this embodiment, a hemming device is provided, which includes a support frame 1, two hemming components 2, a motor 3, and a lead screw-nut mechanism 33. Among them, as Figures 1-3 shown, the lead screw-nut mechanism 33 includes a lead screw 4 and a nut 5. The lead screw 4 is configured with two external threads 42 with opposite helix directions. The nut 5 is configured with a threaded hole 51 adapted to the lead screw 4, and an internal thread is configured in the threaded hole 51. As Figure 4 and Figure 5 shown, during assembly, the two nuts 5 are respectively threadedly connected to the two external threads 42. In this embodiment, the outer side surface of the nut 5 is configured as a cylindrical shape. As Figure 4 and Figure 5 shown, one end of the nut 5 is configured with a connection ring 52. During implementation, the connection ring 52 can preferably be configured as an annular structure. As Figure 4 and Figure 5 shown, the connection ring 52 is also configured with a connection portion.

[0045] As Figures 1-3As shown, two hemming members 2 are arranged oppositely and are respectively movably connected to the support frame 1. During implementation, the hemming member 2 can be connected to the support frame 1 through a guiding mechanism, which not only enables the hemming member 2 to move relative to the support frame 1, but also ensures that the hemming member 2 moves strictly along a straight line. During implementation, the guiding mechanism can adopt an existing guiding mechanism, which includes a guiding portion and a sliding portion adapted to the guiding portion. The sliding portion is movably constrained by the guiding portion. During implementation, the guiding portion can be a guiding groove formed on the support frame 1. Correspondingly, the sliding portion is a guiding block adapted to the guiding groove; the guiding portion can be a guiding rod 25 provided on the support frame 1. Correspondingly, the sliding portion is a guiding ring adapted to the guiding rod 25. Preferably, in this embodiment, the guiding mechanism adopted is a guide rail-slider mechanism. At this time, the guiding portion in the guide rail-slider mechanism is the guide rail 61, and the guide rail 61 is fixed to the support frame 1. The sliding in the guide rail-slider mechanism is the slider 62 adapted to the guide rail 61, and the hemming member 2 is fixed to the slider 62. During implementation, the two hemming members 2 can be connected to the support frame 1 through the same set of guide rail-slider mechanisms, as Figures 1-3 shown, or can be respectively connected to the support frame 1 through two sets of guide rail-slider mechanisms.

[0046] As Figure 1 , Figure 6 and Figure 7 shown, in this embodiment, the hemming member 2 is constructed with a connecting round hole 22 adapted to the nut 5, a cooperating portion adapted to the connecting portion, and a first hemming structure 21 in a hook shape. Among them, the shape and size of the connecting round hole 22 are adapted to the nut 5, so that the nut 5 can be inserted into the connecting round hole 22. After being inserted into the connecting round hole 22, the nut 5 can rotate relative to the connecting round hole 22 under the action of an external force to adjust the orientation of the nut 5.

[0047] As Figure 1 shown, during assembly, the motor 3 is in transmission connection with the lead screw 4 to drive the lead screw 4 to rotate. As Figure 1 , Figure 3 and Figure 7 shown, the nut 5 is inserted into the connecting round hole 22 and can be fixed to the hemming member 2 through a fastener 9 adapted to the connecting portion or the cooperating portion to achieve the purpose of fixing the nut 5.

[0048] To facilitate adjusting the orientation of the nut 5 as needed during the assembly process, in one implementation manner, the connecting portion can be arranged along the circumferential direction of the threaded hole 51. The cooperating portion can be a screw hole 23 (constructed with internal threads), and the cooperating portion can include at least two screw holes 23, and each screw hole 23 is evenly distributed along the circumferential direction of the connecting round hole 22, as Figure 6As shown, in order to more firmly fix the nut 5. At this time, the connecting portion has various implementation manners. For example, the connecting portion may include a plurality of through holes 53. The through holes 53 may be round holes, and each through hole 53 is uniformly distributed along the circumferential direction of the threaded hole 51, as Figure 4 and Figure 5 shown, so that when assembling the nut 5 and adjusting the orientation of the nut 5, the through hole 53 can be aligned with the screw hole 23, ensuring that the nut 5 after adjustment can be fixed to the flanging member 2 by the fastener 9 adapted to the screw hole 23, which is very simple and convenient. Another example is that the connecting portion may include at least two slotted holes 54, and each slotted hole 54 may be respectively configured as an arc-shaped structure, as Figure 8 and Figure 9 shown, and each through hole 53 may be uniformly distributed along the circumferential direction of the threaded hole 51, so that when assembling the nut 5 and adjusting the orientation of the nut 5, the screw hole 23 can be aligned with the slotted hole 54, ensuring that the nut 5 after adjustment can be fixed to the flanging member 2 by the fastener 9 adapted to the screw hole 23.

[0049] In addition, in another implementation manner, the mating portion may also be arranged along the circumferential direction of the connecting round hole 22. At this time, the connecting portion may be the screw hole 23, and the mating portion may include at least two screw holes 23, and each screw hole 23 is uniformly distributed along the circumferential direction of the connecting round hole 22, in order to more firmly fix the nut 5. Correspondingly, at this time, the mating portion also has various implementation manners. For example, the mating portion may include a plurality of through holes 53, and each through hole 53 is uniformly distributed along the circumferential direction of the connecting round hole 22. The through hole 53 may be a round hole or a slotted hole 54 with an arc-shaped structure, so that when assembling the nut 5 and adjusting the orientation of the nut 5, the through hole 53 can be aligned with the screw hole 23, ensuring that the nut 5 after adjustment can be fixed to the flanging member 2 by the fastener 9 adapted to the screw hole 23, achieving the same effect, which will not be elaborated here.

[0050] During implementation, the fastener 9 may be a bolt or a screw, etc., as Figure 3 and Figure 7 shown. During implementation, the mating portion may preferably be constructed at the end of the flanging member 2. In this embodiment, through the cooperation of the nut 5 and the connecting round hole 22, during assembly, the relative position between the nut 5 and the lead screw 4 can be adjusted by rotating the nut 5, ensuring that the two nuts 5 can be symmetrically arranged along the center of the lead screw 4, as Figure 1 and Figure 3 shown, which is not only very simple, convenient and efficient, but also can effectively prevent the problem that the flanging amount on one side is large while the flanging amount on the other side is small during the bag opening process, and can significantly improve the bag opening accuracy; and through the cooperation of the fastener 9 and the connecting portion or the mating portion, the nut 5 after adjustment can be conveniently fixed.

[0051] In this embodiment, the first hemming structure 21 can be formed on the sides of the two hemming members 2 facing away from each other, as Figures 1-3 shown. During implementation, the first hemming structure 21 can be a convex portion formed on the side surface of the hemming member 2 and protruding outward, as Figure 3 shown, so that the entire first hemming structure 21 forms a hook shape by using the convex portion, and thus during the bag opening process, the first hemming structure 21 can be used to assist the hemming piece to be folded to the inner side of the fabric to achieve the purpose of hemming.

[0052] During implementation, the motor 3 can be drivingly connected to the end of the lead screw 4. In the preferred implementation provided in this embodiment, a transmission portion is provided at the middle position of the lead screw 4, as Figure 1 and Figure 3 shown. Two external threads 42 are symmetrically formed on both sides of the transmission portion respectively. At the same time, the motor 3 is drivingly connected to the transmission portion to drive the lead screw 4 to rotate through the transmission portion. During implementation, the transmission portion can be a driven gear 41 or a driven pulley. And during implementation, the transmission portion and the lead screw 4 can be integrally formed or fixed to the lead screw 4 through a fastener 9. As an example, in this embodiment, the motor 3 can be fixed to the support frame 1 and located above the hemming member 2, as Figures 1-3 shown; the output shaft of the motor 3 can be drivingly connected to a driving pulley 31. For example, the driving pulley 31 can be directly installed on the output shaft of the motor 3, as Figure 1 and Figure 3 shown. At this time, the transmission portion adopts a driven pulley, and a transmission belt 32 is also tensioned between the driving pulley 31 and the transmission portion, as Figure 1 and Figure 3 shown, so that the motor 3 can drive the lead screw 4 through the belt drive mechanism. During implementation, the transmission belt 32 can preferably adopt a synchronous belt to improve the transmission accuracy.

[0053] In a more perfect solution, this hemming device further includes a first limiting portion and a second limiting portion for restricting the axial movement of the lead screw 4. The first limiting portion and the second limiting portion are respectively connected to the support frame 1, and the first limiting portion and the second limiting portion are respectively used to restrict the movement of one end of the lead screw 4, so that the lead screw 4 can be restricted at a preset position through the cooperation of the first limiting portion and the second limiting portion. As an example, the lead screw 4 can adopt a stepped shaft, and the first limiting portion and the second limiting portion can be respectively arranged on both sides of the transmission portion to restrict the left and right movement of the transmission portion, so as to achieve the purpose of restricting the left and right movement of the lead screw 4. During implementation, the first limiting portion and the second limiting portion can adopt limiting plates, limiting rods, etc.

[0054] Initially, the two nuts 5 can be in the position with the minimum spacing to facilitate smooth insertion into the fabric. During the bag opening process, first, a seam adapted to the bag opening is cut in the bag mouth area to form a foldable hem piece in the bag mouth area; then, the hemming device is moved to the position corresponding to the bag mouth area, so that the center of the hemming device (for example, the center of the lead screw 4) corresponds to the center of the seam in the lower bag mouth area; then, the hemming member 2 is vertically inserted into the seam in the bag mouth area from top to bottom. At this time, the two hemming members 2 are exactly symmetrically located on both sides of the seam; then, the motor 3 is used to drive the two hemming members 2 so that the hemming members 2 move synchronously in opposite directions, and the movement of the hemming members 2 is used to drive the corresponding side hem piece to be folded to the inner side of the fabric to form the required bag mouth shape; then, the folded hem piece is constrained to maintain the state of the hem piece for subsequent sewing; finally, the motor 3 is used to drive the hemming member 2 to return to the initial position to facilitate smooth withdrawal from the bag mouth area.

[0055] Embodiment 2

[0056] To meet the hemming requirements of bag mouths with different lengths, the main difference between this Embodiment 2 and the above Embodiment 1 is that the hemming device provided in this embodiment further includes at least two intermediate members 7, as Figures 10-12 shown, wherein,

[0057] as Figures 10-12 shown, the hemming member 2 is configured with a guiding hole 24 and a guiding rod 25 adapted to the guiding hole 24, and the guiding rod 25 can be parallel to the moving direction of the hemming member 2. During assembly, the guiding rod 25 of one hemming member 2 passes through the guiding hole 24 of the other hemming member 2, and the two guiding rods 25 are parallel to each other. During the synchronous movement of the two hemming members 2, the cooperation between the guiding hole 24 and the guiding rod 25 can further guide the hemming member 2.

[0058] as Figures 10-12 shown, on both sides of each intermediate member 7, a second hemming structure 71 in the shape of a hook is configured. During implementation, the second hemming structure 71 can be a protruding portion formed on the side surface of the intermediate member 7 and protruding outward, as Figure 10 shown, so as to use the protruding portion to make the entire second hemming structure 71 form a hook shape, so that during the bag opening process, the second hemming structure 71 can be used to assist the hem piece to be folded to the inner side of the fabric to achieve the purpose of hemming.

[0059] During implementation, each intermediate member 7 is respectively configured with a sliding hole adapted to the guiding rod 25. The intermediate member 7 can be sleeved on the guiding rod 25 through the sliding hole and can move along the guiding rod 25. The two guiding rods 25 can not only guide the intermediate member 7, as Figures 10-12As shown, the two guide rods 25 can also play a role in restricting the intermediate member 7, preventing the intermediate member 7 from rotating relative to the guide rods 25, and ensuring that the intermediate member 7 can only move along the guide rods 25; as Figures 10-12 shown, the intermediate members 7 are respectively arranged in columns between the two hemming members 2.

[0060] During implementation, elastic members 8 are respectively arranged between two adjacent intermediate members 7. At the same time, elastic members 8 are also arranged between the hemming members 2 and the intermediate members 7, as Figures 10-12 shown, during implementation, the elastic members 8 can be cylindrical helical compression springs, conical helical springs, scroll helical springs, etc. In a more perfect implementation, the elastic members 8 can also be sleeved on the guide rods 25. As shown in the figure, the stability of the elastic members 8 can be effectively improved, ensuring that the elastic members 8 strictly expand and contract along the length direction of the guide rods 25.

[0061] During actual use, when the motor 3 drives the two hemming members 2 to approach each other, the intermediate members 7 are synchronously driven to approach each other through the elastic members 8. During this process, the elastic potential energy of the elastic members 8 gradually increases. Since this process relies on the elastic members 8 to drive the intermediate members 7, the intermediate members 7 can be automatically and evenly distributed between the two hemming members 2, which is more conducive to assisting in hemming. When the motor 3 drives the two hemming members 2 to move away from each other, the elastic members 8 automatically release the elastic potential energy. During this process, the elastic members 8 can synchronously drive the intermediate members 7 to move away from each other, and the elastic potential energy of the elastic members 8 gradually decreases. Since this process relies on the elastic members 8 to drive the intermediate members 7, the intermediate members 7 can be automatically and evenly distributed between the two hemming members 2, which is more conducive to assisting in hemming. Therefore, with this design, not only can the intermediate members 7 be evenly distributed between the two hemming members 2 in any state, but also the combination of the second hemming structures 71 can be used to automatically adapt to bag mouths of different lengths to meet the hemming requirements of bag mouths of different lengths.

[0062] It can be understood that during implementation, the number of the intermediate members 7 can be determined according to actual needs and will not be elaborated here.

[0063] Embodiment 3

[0064] This embodiment provides a bag opening device, including a frame and the hemming device in the above embodiment. The support frame 1 of the hemming device is connected to the frame so as to support the hemming device by using the frame.

[0065] During implementation, the support frame 1 of the hemming device can be fixedly connected to the frame or can be vertically liftably connected to the frame through a guide rail slider mechanism.

[0066] The above are only specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or substitutions, which should all be covered within the protection scope of the present utility model.

Claims

1. A folding device, characterized in that: It includes a support frame, two folding parts, a motor and a screw-nut mechanism, wherein: The screw-nut mechanism comprises a screw and a nut, wherein the screw is provided with two sections of external threads with opposite rotation directions, the nut is provided with a threaded hole adapted to the screw, the two nuts are respectively threadedly connected to the two sections of external threads, one end of the nut is provided with a connecting ring, and the connecting ring is provided with a connecting portion. The two folding parts are arranged opposite to each other and are movably connected to the support frame respectively. The folding parts are constructed with a connecting circular hole adapted to the nut, a matching part adapted to the connecting part and a first folding structure in a hook shape. The connecting part is arranged along the circumferential direction of the threaded hole or the matching part is arranged along the circumferential direction of the connecting circular hole. The motor is connected to the screw rod in a transmission manner, the nut is inserted into the connecting circular hole, and is fixed to the folding component through a fastener adapted to the connecting part or the matching part.

2. The folding device according to claim 1, characterized in that: The connecting portion comprises a plurality of through holes, each of which is evenly distributed along the circumferential direction of the threaded hole; and the matching portion is a screw hole adapted to the through hole.

3. The folding device according to claim 1, characterized in that: The connecting portion comprises at least two strip holes, the strip holes are arc-shaped structures, and the through holes are evenly distributed along the circumferential direction of the threaded hole; the matching portion is a screw hole adapted to the strip holes.

4. The folding device according to claim 1, characterized in that: The matching portion comprises at least two screw holes, and the screw holes are evenly distributed along the circumferential direction of the connecting circular hole.

5. The folding device according to claim 1, characterized in that: The matching portion includes a plurality of through holes, each of which is evenly distributed along the circumferential direction of the connecting circular hole; the connecting portion is a screw hole adapted to the through hole, and the through hole is a circular hole or a strip hole.

6. The folding device according to claim 1, characterized in that: The two nuts are symmetrically arranged along the center of the screw rod.

7. The folding device according to claim 1, characterized in that: A transmission part is arranged at the middle position of the screw rod, two sections of the external threads are symmetrically constructed on both sides of the transmission part, and the motor is in transmission connection with the transmission part.

8. The folding device according to claim 1, characterized in that: It also includes a guiding mechanism, and the folding component is connected to the supporting frame through the guiding mechanism.

9. The folding device according to claim 1, characterized in that: Also includes at least two intermediate components, wherein The folding component is constructed with a guide hole and a guide rod adapted to the guide hole, wherein the guide rod of one folding component passes through the guide hole of the other folding component, and the two guide rods are parallel to each other; A hook-shaped second folding structure is respectively constructed on both sides of each intermediate component, and each intermediate component is respectively constructed with a sliding hole adapted to the guide rod, and the intermediate component is sleeved on the guide rod through the sliding hole, and each intermediate component is arranged in a row between the two folding components; An elastic component is respectively arranged between two adjacent middle components, and an elastic component is arranged between the folding component and the middle component; When the two folding parts approach each other, the intermediate parts are synchronously driven to approach each other, and the elastic potential energy of the elastic part increases. When the two folding parts move away from each other, the elastic part releases the elastic potential energy and synchronously drives the intermediate parts to move away from each other.

10. A bag opening device, 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 installed on the frame.

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