Edge covering strip guiding device and edge covering machine

Abstract

The utility model relates to an edge covering strip guiding device and an edge covering machine. The edge covering strip guiding device comprises an edge covering cylinder. The edge covering cylinder is provided with a cloth conveying channel for conveying edge covering strips, and a cloth inlet and a cloth outlet are formed in the two ends of the cloth conveying channel. A first rotating shaft is arranged on one side, behind the cloth outlet, of the edge covering cylinder; when the edge covering cylinder exits from the edge covering state, the cloth outlet rotates towards the convex side around the first rotating shaft; and meanwhile, the first rotating shaft moves towards the concave side of the edge covering cylinder in the edge covering state. According to the edge covering strip guiding device, the edge covering barrel quits from the edge covering state through a set of composite motion, the concave side of the cloth outlet always faces the feeding teeth through the composite motion, a sending-out section can be folded in the same mode as a reverse folding section, and therefore the edge covering strip with the uniform width can be formed in the edge covering ending process and the edge covering initial process. The edge is neat, and the surface is flat.

Description

Technical Field

[0001] This utility model relates to the field of edge binding operation technology in sewing technology, specifically to an edge binding strip guide device and an edge binding machine. Background Technology

[0002] Fabric is primarily woven from warp and weft threads. If the exposed edges of the fabric are not treated, the warp and weft threads can easily separate, causing the fabric edges to fray and become fraying. Therefore, it is generally necessary to protect the fabric edges during the sewing process. One such protective measure is to bind the fabric edges.

[0003] It should be noted that the technology of using a binding tube to fold and feed the binding strip is a mature existing technology. Similar binding tube structures can be found in Chinese patent documents such as CN215668470U and CN213037971U. However, for the overall binding technology integrated into an industrial sewing machine, an automated, efficient, and stable binding device needs to not only guide the binding strip but also handle auxiliary tasks such as cutting the binding strip, and it is necessary to ensure the efficient and stable operation of the industrial sewing machine.

[0004] To ensure the consistency and neatness of the binding, the fabric outlet of the binding tube is generally placed near the presser foot, allowing the fabric to be inserted into the notch of the binding tube. At this point, there is practically no space between the binding tube and the presser foot for cutting; neither hot nor cold cutting mechanisms have sufficient room to maneuver. Furthermore, even if the cutting action can be completed, it cannot be guaranteed that the fabric to be bound will not be cut incorrectly. Therefore, the cutting mechanism is generally designed upstream of the binding tube or integrated into the conveyor path of the binding strip on the binding tube. While designing the cutting mechanism upstream of the binding tube can achieve the cutting task, it involves the reloading of the binding strip, making it difficult to apply in automated mass production. A solution integrating the cutting mechanism into the conveyor path of the binding strip on the binding tube has been disclosed in Chinese Patent Document CN218756418U. However, it should be noted that because the binding tube gradually deforms and narrows along the material output direction, and its cross-section is curved during the process, the applicant found during actual testing and debugging that, on the one hand, it is difficult to ensure stable cutting of the binding strip through the cooperation of the moving blade and the binding tube wall; on the other hand, the cut binding strip may still become clogged inside the binding tube due to the influence of the narrowed binding tube surface, seriously affecting the continuity of operation and production efficiency. Therefore, similar solutions are also difficult to widely apply in industrial sewing machines.

[0005] In practice, applicants still prefer to install a cutting mechanism downstream of the binding tube (i.e., outside the outlet of the binding tube along the direction of the binding strip feed), so that the binding strip is always inside the binding tube before and after cutting, and there is no issue of feeding reliability.

[0006] The applicant has filed a Chinese patent application related to the binding tube, application number 202410713883.4, entitled "Binding Tube Assembly and Binding Machine," which has been published. To achieve the arrangement of the cutting mechanism, the applicant provides a controlled-movement binding tube solution in the aforementioned patent. When cutting is required, the binding tube is moved to provide space for the cutting mechanism to operate.

[0007] However, in the above solution, the binding tube mainly moves in a reciprocating linear motion, and in practice, its linear motion direction is basically perpendicular to the binding direction of the fabric. In reality, the binding strip undergoes a flipping and folding process after exiting the binding tube. Therefore, as the binding tube moves backward in a straight line, its original flipping position will not change. In other words, the binding strip that continues to be exposed outside the binding tube exit as the binding tube moves backward is not folded. If it continues to be used for binding and sewing, it will create obvious and unsightly outward flipping and wrinkles at the end of the binding.

[0008] The content of the prior art cited in the above background section is considered to be the content described in this application based on the reference. Utility Model Content

[0009] Given that the finishing effect of the existing binding tube is not good after one binding cycle, resulting in appearance problems such as outward turning, wrinkles, and uneven binding width at the end of the binding cycle and the beginning of the next binding cycle, this utility model provides a binding strip guide device and a binding machine.

[0010] The present invention provides a binding strip guide device, including a binding tube;

[0011] The binding tube has a fabric feeding channel for conveying the binding strip, and a fabric inlet and a fabric outlet are formed at both ends of the fabric feeding channel;

[0012] The fabric feeding channel at the fabric outlet has a U-shaped cross section, and the concave side of the binding tube is defined based on the direction of the inner concave surface of the U-shaped cross section, and the convex side of the binding tube is defined based on the direction of the outer convex surface of the U-shaped cross section.

[0013] In the edge-binding state, the front is defined by the direction of material exiting the fabric outlet; the rear is defined by the opposite direction of material exiting the fabric outlet.

[0014] The binding tube has a first pivot on one side behind the fabric outlet;

[0015] When the binding tube exits the binding state, the fabric outlet rotates around the first rotating axis to the convex side; and at the same time, the first rotating axis moves to the concave side of the binding tube in the binding state, so that while the binding tube rotates, there is at least a translational component towards the concave side of the binding tube in the binding state, thereby ensuring that the binding strip always flows out along the reverse binding channel when the binding tube exits the binding state.

[0016] Preferably, the edge banding guide device includes a fixed guide component and a movable component;

[0017] The movable component includes an edge-binding tube and a rolling component that is rolled on the guide component; in the movable component, the rolling component is drivenly connected to the first rotating shaft of the edge-binding tube, and the first rotating shaft is fixedly connected to the edge-binding tube.

[0018] Preferably, when exiting the binding state, the binding cylinder moves upward along the axial direction of the first rotating shaft.

[0019] Preferably, the edge banding guide device includes a fixed guide component and a movable component;

[0020] The movable component includes an edge-binding tube and a rolling component that is rolled on the guide component; the rolling component is drivenly connected to a first rotating shaft of the edge-binding tube, and the edge-binding tube is circumferentially fixed to the first rotating shaft;

[0021] The movable component includes a support surface disposed below the binding tube, the lower surface of the binding tube being in contact with the support surface, and an elastic component being disposed between the binding tube and the movable component, the elastic component pressing the binding tube against the support surface along the axial direction of the first rotating shaft.

[0022] Preferably, the movable component is coaxially and fixedly connected to the first rotating shaft.

[0023] Preferably, when the binding tube is out of the binding state, the rolling component rolls along an arc path on the guide component, causing the movable component to rotate toward the concave side of the binding tube in the binding state.

[0024] Preferably, the movable component is provided with a swing arm, one end of which is rotatably disposed at the second pivot, and the rolling component is rotatably disposed on the swing arm and rolls in cooperation with the guide component; the center of the arc path coincides with the second pivot.

[0025] Preferably, when the binding tube exits the binding state, the rolling component rolls along a straight path on the guide component, causing the moving component to translate towards the concave side of the binding tube in the binding state.

[0026] Preferably, the guide component is a rack, the movable component is a gear, and the gear meshes and rolls on the rack.

[0027] Preferably, the active component includes a drive device for driving the active component to roll.

[0028] Preferably, the driving device and the rolling assembly are coaxially fixed.

[0029] Preferably, the driving device is coaxially arranged with the second rotating shaft, and the driving device is connected to the rolling assembly in a transmission manner.

[0030] Preferably, a check plate is provided in the fabric feeding channel of the binding tube, the check plate being used to prevent the binding strip from retracting in a direction opposite to the conveying direction.

[0031] Preferably, the check sheet is an elastic sheet, and one end of the elastic sheet is pressed against the edge strip along the conveying direction of the edge strip.

[0032] Preferably, it further includes a shearing mechanism having a shearing component capable of controlled movement;

[0033] When the binding tube exits the binding state, the shearing component moves to contact the binding strip and cuts the binding strip.

[0034] This utility model also provides an edge-binding machine, including the edge-binding strip guiding device described in any of the above claims.

[0035] Preferably, the needle plate of the binding machine has a reciprocating feeding tooth, the binding strip guide device is located behind the feeding tooth, and the binding cylinder extends forward to the feeding side of the feeding tooth in the binding state.

[0036] Preferably, a guide is fixedly provided on the needle plate. The guide is located between the feed tooth and the fabric outlet of the extended binding tube. The guide is used to guide the cut binding strip.

[0037] In the binding strip guiding device of this utility model, the binding tube exits the binding state through a set of compound movements. Specifically, it is composed of the binding tube rotating around the first rotating axis and the first rotating axis moving towards the concave side of the binding tube. The rotation of the binding tube causes the fabric outlet to move towards the convex side while retracting. The movement of the first rotating axis towards the concave side causes the binding tube as a whole to have a moving component towards the concave side, thereby reducing the displacement of the fabric outlet on the convex side.

[0038] This combined motion ensures that the concave side of the fabric outlet always faces the feed teeth. This allows the feeding section to naturally complete the folding of the binding strip and naturally concave into the reverse binding channel throughout the entire process of the binding tube movement under the force of the pulling action, forming the same folding method as the reverse folding section. As a result, a binding appearance with uniform width, neat edges, and a flat surface can be formed in both the finishing and initial processes of binding. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of a binding tube in the prior art;

[0040] Figure 2 This is a schematic diagram of the feeding process of the edge-sealing cylinder in the existing technology when sealing a single layer.

[0041] Figure 3 This is a schematic diagram of the feeding process of the edge-sealing cylinder during double-layer edge sealing in the prior art;

[0042] Figure 4 This is a schematic diagram of the operation of the edge-sealing tube during double-layer edge sealing in the prior art;

[0043] Figure 5 A schematic diagram of a movable edge-sealing tube in the prior art;

[0044] Figure 6 This is a schematic diagram of the structure of the edge banding guide device 1 of this utility model;

[0045] Figure 7 This is a simplified schematic diagram of the motion of the edge banding guide device 1 of this utility model;

[0046] Figure 8 Motion simulation data for an embodiment of the edge banding guide device 1 of this utility model;

[0047] Figure 9 This is a schematic diagram of the structure of the edge-binding tube 3 in the edge-binding strip guide device 1 of this utility model;

[0048] Figure 10 This is a schematic diagram of the edge banding guide device 1 with a cutting mechanism 34 in this utility model;

[0049] Figure 11 This is a schematic diagram of the edge-binding machine with edge-binding strip guide device 1 in this utility model;

[0050] Figure 12 This is a partially enlarged schematic diagram of the edge-binding machine at the machine head in this utility model;

[0051] Figure 13 This is a schematic diagram of another embodiment of the edge banding guide device 1 of this utility model;

[0052] Figure 14 This is a schematic diagram of another embodiment of the edge banding guide device 1 of this utility model;

[0053] Figure 15 This is a schematic diagram of another embodiment of the edge banding guide device 1 of this utility model;

[0054] Figure 16The edge banding guide device 1 of this utility model Figure 15 A schematic diagram of the multi-link mechanism 4 in the embodiment;

[0055] Figure 17 This is a schematic diagram of the binding tube of the binding strip guide device 1 of the present invention.

[0056] In the picture:

[0057] 1: Binding strip guide device; 11: Guide assembly; 12: Rolling assembly; 13: Moving assembly; 131: Swing arm; 132: Support surface; 133: Elastic assembly; 134: Rotating assembly; 1341: Spiral guide groove; 135: Fixing assembly; 14: Drive device; 2: Binding machine; 21: Presser foot; 22: Sewing needle; 23: Needle plate; 24: Feed dog; 25: Guide; 3: Binding tube; 31: Fabric feeding channel; 311: Fabric inlet; 312: Fabric outlet; 3121: Side; 3 122: Ridge; 3123: Reverse wrapping channel; 3124: Material stop groove; 313: Anti-return plate; 32: Serpentine bracket; 33: Pressing plate; 34: Shearing mechanism; 341: Shearing assembly; 342: Hot cutting knife; 343: Sliding shaft; 4: Multi-link mechanism; 41: Connecting rod; 42: Rocker arm; 421: Slide groove; 422: Fixed end; F: Direction of movement; O: First rotating shaft; O2: Second rotating shaft; W: Binding strip; W1: Guide section; W2: Feeding section; W3: Reverse folding section; WW: Main fabric. Detailed Implementation

[0058] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. In this specification, the dimensions of the drawings do not represent the actual dimensions. They are only used to illustrate the relative positional and connection relationships between the components. Components with the same name or the same reference numeral represent similar or identical structures and are limited to illustrative purposes.

[0059] Figure 1 A schematic diagram of the structure of the edge-sealing tube 3 in the prior art (attached) Figure 1-5 (All views are perspective views, not orthographic views). The binding tube 3 is used not only to guide the binding strip W to the front of the presser foot of the sewing machine head, but also to constrain the binding strip W into the required fold shape during binding, so that the binding strip W can be neatly and reliably sewn to the edge of the main fabric WW. To achieve the above purposes, the binding tube 3 typically includes a feed channel 31. In the prior art, as shown in sections AA and BB, the feed channel 31 has a fabric inlet 311 and a U-shaped fabric outlet 312. As shown in section CC, the fabric outlet 312 has a certain angle relative to the feed direction of the feed channel 31. The presence of the angle makes the fabric outlet 312 have a U-shaped section not only in the fabric feed direction (section AA), but also when viewed along the direction of the U-shaped opening (section DD). Reference Figure 1 With the angle set, the fabric outlet 312 will form tapered, constricted side portions 3121 on both sides and a concave ridge 3122 between the two side portions, clearly forming a reverse wrapping channel 3123 formed by the side portions 3121. Optionally, a serpentine support 32 may be provided in addition to the fabric inlet 311 of the binding tube 3 to flatten the binding strip W and feed it into the fabric inlet 311.

[0060] Figure 2 for Figure 1 A schematic diagram of the feeding of the edge-sealing tube 3 during single-layer edge sealing. (Reference) Figure 2 The diagram shows the cut after sewing. A single-layer binding refers to the binding strip W being folded in half (not necessarily symmetrically), with the edge of the main fabric WW sandwiched between the two layers of the folded binding strip W. The edge of the main fabric WW is protected by the binding strip W, which largely eliminates problems like edge fraying. If a serpentine support 32 exists for the single-layer binding, the binding strip W, from the rolled-up storage, alternately passes through the gaps of the serpentine support 32 at the guide section W1, advancing in an S-shape. During this advancement, it gradually flattens out and prevents premature folding of the binding strip W. The binding strip W is shaped into a U-shaped cross-section by the feed channel 31, which gradually changes to a U-shape, and is then fed out from the outlet 312. Referring to the diagram of the binding strip folding, after exiting the outlet 312, the binding strip W is reversed and fed out along the reversed-fold channel 3123 of the outlet 312. The reversed-folding here can be referenced... Figure 2 The diagram shows a binding tube 3. When the binding strip W exits the fabric outlet 312, it folds to one side to form an inner folded surface (the normal of the inner folded surface points inward into the U-shaped cross-section, concave into the wrapping channel 3123). However, when the binding strip W passes through the wrapping channel 3123, it undergoes a process of being squeezed inward from the center towards the ridge 3122. The squeezing force is generally provided by the main fabric WW, while the edge portion of the binding strip W located on the side 3121 does not shrink inward. Through this deformation, the original inner folded surface flips into the outer folded surface of the reverse fold section W3, i.e., the inner and outer folded surfaces are flipped. Furthermore, the direction of movement F of the binding strip W changes naturally after the wrapping, from extending along the normal of the fabric outlet 312 through the angled cut of the fabric outlet 312 to moving along the normal of the wrapping channel 3123 or roughly along the normal of the wrapping channel 3123.

[0061] Figure 3 for Figure 1 A schematic diagram of the feeding of the edge-sealing cylinder 3 during double-layer edge sealing. (Reference) Figure 3 The diagram shows the cut after sewing; the so-called double-layer binding refers to... Figure 2 Based on the single-layer binding shown, the edges of each side of the binding strip W are folded inward into the U-shape, thus concealing and protecting the edges of the binding strip W within the binding. At this point, the binding strip W has a four-layer structure at the folded section W3. Figure 3 The general structure of the double-layered edge-sealing tube 3 is similar to Figure 2 They are basically the same, the difference being that, for double-layer binding, the shrinkage ratio between the inlet 311 and outlet 312 of the fabric feeding channel 31 is different, and additional guide ridges or other structures may be formed in the fabric feeding channel 31 so that the binding strip W has the cross-sectional shape required for the secondary folding when it is fed out of the outlet 312.

[0062] Figure 4 This is a schematic diagram of the binding tube 3 during double-layer binding (the light-colored lines represent the portion covered by the main fabric WW). During the binding sewing process, the feed dog 24 continuously advances the main fabric WW and the folded section W3. To ensure that the binding strip W is neatly and stably positioned at the edge of the main fabric WW and evenly covers the edge of the main fabric WW during sewing, the fabric outlet 312 of the binding tube 3 extends forward to the front of the feed dog 24 during sewing, so that the edge of the main fabric WW about to enter the feed dog 24 enters the folded channel 3123 and is wrapped by the folded section W3. At this time, one side 3121 is above the main fabric WW, and the other side of the main fabric WW is below the main fabric WW. The reciprocating motion of the feed dog 24, in conjunction with the presser foot 21, drives the binding strip W and the main fabric WW to move together. In this situation, the binding strip W is continuously fed along the direction of movement F and continuously transforms into the folded section W3 after exiting the fabric outlet 312. During this sewing, the process is basically stable.

[0063] The applicant disclosed a movable binding tube 3 in Chinese patent document entitled "Binding Tube Assembly and Binding Machine" with application number 202410713883.4, the schematic diagram of which is shown in the figure. Figure 5 When the binding and cutting operation is completed, the binding tube 3 moves generally in the opposite direction of the feeding direction of the binding strip W, F2, and exits directly in front of the feed tooth 24. At this time, due to the retraction of the binding tube 3, a feeding section W2 is formed between the feed tooth 24 and the fabric outlet 312, exposing the fabric outlet 312, and providing space between the presser foot 21 and the fabric outlet 312 for the corresponding cutting mechanism to move. The cutting mechanism cuts the binding strip W at the feeding section W2. When the binding operation restarts, the binding tube 3 extends forward until the fabric outlet 312 is directly in front of the feed tooth 24, and clamps the main fabric WW in the reverse binding channel 3123 between the sides 3121.

[0064] Based on the aforementioned prior art, those skilled in the art understand that aesthetically pleasing and neat edging depends on the stable and consistent folding of the edging strip W during continuous feeding. Firstly, it is necessary to stably ensure that the edging strip W consistently forms the reverse fold section W3 used during sewing, that is, to ensure that the edging strip W can achieve the expected folding. Secondly, it is also necessary to form uniform and consistent crease positions on this basis; otherwise, the edge of the edging may be wavy, with inconsistent width.

[0065] Figure 5 The original intention of this technical solution is to create space for the cutting mechanism by moving the binding tube 3, thereby cutting the binding strip W at the feeding section W2 before the fabric outlet 312. In this way, the binding strip W continues to pass through the feeding channel 31 after cutting, eliminating the problem of unstable feeding caused by refeeding. However, this solution did not consider other related issues at the outset, namely, how to ensure that the binding strip W forms the preset folded shape for binding during the movement of the binding tube 3. The development of this technical solution mainly focused on the cutting problem. When designing the movement of the binding tube 3 to provide the corresponding cutting space, those skilled in the art assumed that the movement of the binding tube 3 would not affect the shape formation of the binding strip W, and naturally did not make any targeted improvements to this design.

[0066] In addition, in design Figure 5 When providing the technical solution, those skilled in the art have suggested using an additional swaying mechanism to allow the fabric outlet 312 of the binding tube 3 to sway appropriately towards the feed dog 24 during its forward extension. This allows "the binding strip at the front end of the binding tube to bypass the presser foot and enter between the presser foot and the needle plate in a swinging manner, which facilitates the binding strip directly contacting the product to be processed in one go." This essentially assumes that after cutting, it is only necessary to ensure that the binding strip enters the preset position. The swaying motion described here is more about ensuring that when the binding strip W contacts the main fabric WW, it has a movement towards the feed dog 24, thereby smoothly feeding it into the space between the feed dog 24 and the presser foot 21 along the feeding direction of the main fabric WW. In other words, when this solution is formed, it is assumed that as long as the binding strip W can enter the sewing position, the binding operation can be carried out, and it is assumed that the shape of the binding strip W entering the sewing operation is as expected.

[0067] However, during prototype debugging, it was found that the technical solution did not work as expected. This was because the solution only focused on the layout of the shearing mechanism, completely ignoring the potential impact on the shape of the binding strip W when the position of the binding cylinder 3 was dynamically adjusted.

[0068] refer to Figure 5When all the technologies are laid out, we clearly notice that the feeding section W2 and the reverse folding section W3 have different extension directions and folding directions. The switching between the feeding section W2 and the reverse folding section W3 is achieved through two main factors: firstly, the angled design at the fabric outlet 312 creates a reverse wrapping channel 3123 on the side of the lateral feed tooth 24; secondly, the feed tooth 24 drives the binding strip W and the main fabric WW to move, causing the binding strip W to continuously advance along the direction of movement F. Due to the pull of the feed tooth 24 on the binding strip W, it inevitably deforms in that direction. At this point, the binding strip W is supported by the side 3121 and the ridge 3122 at the black triangle position shown in the diagram, thus naturally confining it within the reverse wrapping channel 3123, changing from an outward fold at the feeding section W2 to an inward fold at the reverse folding section W3.

[0069] Continuing to consider this further, when the binding tube 3 retracts, the feed section W2 is exposed. At this point, the feed section W2 is no longer supported by the binding tube 3, which is why it can be cut at the feed section W2. Considering the situation after cutting, the folded section W3 can continue to be sewn, but the cut feed section W2, as shown in the diagram, no longer has the support of the binding tube 3. Therefore, it obviously cannot spontaneously complete the transition from the outward fold of the feed section W2 to the inward fold of the folded section W3. In other words, when continuing the binding finishing work, the feed section W2 will not be able to wrap around the edge of the main fabric WW in the expected folding manner of the folded section W3. The feed section W2 may extend outward from the edge of the main fabric WW as shown in the diagram, forming a tail. When the corrector for the binding strip W is added, it can indeed prevent the binding strip W from protruding, but it still cannot guarantee that the feed section W2 can spontaneously transform into an inward folded shape like the reverse fold section W3. Therefore, the feed section W2 is more often pressed against the surface of the main fabric WW in a random shape and sewn, which creates obvious wrinkles and an uneven feel at the edge of the main fabric WW surface, and cannot form an effective binding starting section.

[0070] Consider the scenario of restarting the binding process. The first issue is that the continuous feeding of the binding strip W comes from the reciprocating motion of the feed teeth 24. However, the delivery section W2, which remains on the binding cylinder 3 after cutting, is initially impossible to be driven by the feed teeth 24 because it doesn't contact them. Therefore, when the binding cylinder 3 is extended forward, it's uncertain whether the delivery section W2 will extend forward with it or retract accordingly. During the debugging process, sometimes due to the high friction between the binding strip W and the binding cylinder 3, and the relatively loose binding strip W between the binding cylinder 3 and the incoming roll with sufficient allowance, the delivery section W2 might extend forward along with the binding cylinder 3. However, retraction also occurs, with the worst-case scenario being that the delivery section W2 retracted into the fabric feeding channel 31.

[0071] Even if the feed section W2 doesn't retract, it's difficult to achieve the desired technical effect. The feed section W2 generally extends outwards along the fabric outlet 312 (the U-shaped cross-section provides some support, ensuring the feed section W2 maintains a forward extension). Therefore, during its extension, the feed section W2 primarily abuts against the edge of the main fabric WW and accumulates. Then, under the continuous friction of the main fabric WW, it gradually enters the feed dog 24 and is sewn. Although it can eventually be sewn to form an edging, initially, the accumulated edging strip W does not form a stable folded section W3. Therefore, the resulting edging will have problems such as looseness, wrinkles, uneven edges, and inconsistent width. Even with the addition of a sway mechanism, the feed direction of the feed section W2 remains unchanged, and the final stopping position of the edging tube 3 also remains unchanged. Therefore, the sway mechanism is unlikely to achieve the desired effect of facilitating the feed section W2's entry into the feed dog 24 and presser foot 21.

[0072] Figure 6 This is a schematic diagram of the hemming strip guide device 1 of this application. To avoid problems caused by the linear motion of the hemming tube 3, the hemming strip guide device 1 of this application provides a function that allows the hemming tube 3 to simultaneously translate and rotate. (Reference) Figure 1 The schematic diagram shows that for the binding tube 3, we define the front-to-back direction according to the feeding direction of the binding strip W, specifically, the direction in which the binding strip W is fed out from the fabric outlet 312 is defined as the front. That is, referring to this definition, the fabric inlet 311 is located behind the fabric outlet 312. Furthermore, since the feeding channel 31 of the binding tube 3 has a U-shaped cross-section at the fabric outlet 312, which obviously gives the binding tube 3 an outwardly convex surface and an inwardly concave surface, we define the side pointed to by the inwardly concave surface of the feeding channel 31 of the binding tube 3 as the concave side, and conversely, the opposite side as the convex side. Obviously, during the binding process, the sewing mechanism, such as the feed dog 24, is located on the concave side of the fabric outlet 312, and the reverse-folded section W3 flowing out of the fabric outlet 312 from the reverse binding channel 3123 also flows out from the concave side to between the feed dog 24 and the presser foot 21.

[0073] The binding strip guide device 1 includes a movably disposed binding tube 3. A first rotating shaft O is located on the binding tube 3, positioned behind the fabric outlet 312. The binding tube 3 rotates around the first rotating shaft O, the direction of rotation defined as causing the fabric outlet 312 to rotate relative to the first rotating shaft O towards the convex side of the fabric outlet 312. Furthermore, while the binding tube 3 rotates, the first rotating shaft O can move towards the side pointed to by the concave side when the binding tube 3 begins to rotate (meaning at least a translational component exists in this direction).

[0074] refer to Figure 7The diagram illustrates the trajectory T1 of the binding strip W during the movement of the binding tube 3. For reference, the diagram also shows the trajectory T2 of the fabric outlet 312 moving in a circle around the initial position of the first rotating axis O. Considering the process of the binding tube 3 moving from a stable binding position (i.e., the binding state) to a certain position and then stopping, under the combined motion of the first rotating axis O and the rotation of the binding tube 3, the fabric outlet 312 moves backward on one hand and continuously rotates towards its convex side on the other. Because the binding strip W is pressed down by the feed teeth 24, the backward movement causes the fabric outlet 312 of the binding tube 3 to continue to eject W, forming an unsewn feed section W2. During this process, the distance between the fabric outlet 312 and the folding section W3 continues to increase. Therefore, the feeding section W2 is always pulled by the folding section W3. Furthermore, we note that during rotation, the concave side of the fabric outlet 312 always faces the folding section W3. In other words, under the pulling force, the feeding section W2 inevitably has the shortest possible path connecting the fabric outlet 312 and the folding section W3, as shown in the figure. Referring to the detailed design at the fabric outlet 312, this allows the feeding section W2 to naturally complete the folding of the binding strip W and naturally become concave within the folding channel 3123 throughout the entire movement of the binding cylinder 3 under the pressure of the pulling force. Figure 17 As shown, the binding tube 3 has a baffle groove 3124 extending outward along the direction of the reverse wrapping channel 3123 on the concave side. It has a groove extending from the reverse wrapping channel 3123 and ridges protruding on both sides of the groove. The ridges on both sides block the reverse-wrapped fabric strips in the baffle groove 3124 to prevent the reverse-wrapped fabric strips from deviating to both sides of the baffle groove 3124.

[0075] This motion control scheme achieves two main objectives: First, it ensures that the resulting delivery segment W2 has the same folding pattern as the reverse fold segment W3, which is fundamentally different from the delivery segment formed by the reciprocating motion mechanism in the prior art, which differs from the reverse fold segment W3. Second, it ensures that the resulting delivery segment W2 naturally enters the reverse wrapping channel 3123, forming a reverse wrapping fold shape identical to that during the edge wrapping operation, and that the delivery segment W2 naturally extends from the reverse wrapping channel 3123, completing the reversal.

[0076] Considering the first point, when the feed section W2 is cut off at a certain point in the middle, a portion of it connects to the reverse fold section W3. During the finishing of the hem, as the sewing progresses, this portion of the feed section W2 continues to be sewn to the edge of the main fabric WW. Because the feed section W2 has the same folded shape as the reverse fold section W3, it can be stably and evenly fed in during the sewing process along with the work of the feed dog 24, thus forming a hem with uniform width, neat edges, and a flat surface. However, in the prior art, because the folding directions between the feed section W2 and the reverse fold section W3 are opposite, and there is a lack of technology to complete the reverse folding of the feed section W2 during the continued hem sewing process, as mentioned above, it obviously does not possess the technical effect of the technical solution of this application.

[0077] Considering the second point, when the feed section W2 is cut at a certain point in the middle, a part of it is exposed at the fabric opening 312. Due to the pulling effect before it was cut, after being exposed at the fabric opening 312, it spontaneously becomes concave within the reverse wrapping channel 3123. This not only completes the reversal, that is, from pointing in front of the fabric opening 312 when it flows out of the fabric opening 312, it changes to pointing towards the concave side of the fabric opening 312 after passing through the reverse wrapping channel 3123, but also completes the reverse wrapping, so that the feed section W2 flowing out from the reverse wrapping channel 3123 has the same folded shape as the reverse folding section W3. When the next round of hemming begins, the hemming tube 3 is reset. At this time, since the feeding section W2 has the same folding shape as the required reverse folding section W3 and extends towards the concave side of the fabric outlet 312, at the end of the reset process, the feeding section W2 basically achieves the same direction and movement direction as the edge of the main fabric WW. Since the feeding section W2 already has the required folding shape, it can be smoothly connected between the feeding tooth 24 and the presser foot 21, ensuring the stability and reliability of the hemming start process. Furthermore, based on the reasons mentioned at the end, it also ensures the neatness and beauty of the hemming start position.

[0078] There is a third point: due to the translational motion component during the movement of the first rotating shaft O, compared to directly designing the binding tube 3 as rotating around a fixed axis with a trajectory T2, the trajectory T1 of the fabric outlet 312 in this technical solution is obviously flatter, which has several advantages. Firstly, given that the binding tube 3 is generally mounted on the needle plate 23, positioned towards the side where the feed dog 24 feeds the fabric and with the convex side facing outwards, it is relatively close to the edge of the needle plate 23. An excessively protruding trajectory T2 actually exceeds the space that the sewing machine body can cover and shield, potentially causing hidden dangers during movement, such as accidental injury to the operator's limbs. Secondly, if it simply rotates around a fixed axis, according to... Figure 7As illustrated, although the distance from the folding section W3 to the fabric outlet 312 is also increasing, achieving a pulling effect, the angle between its delivery section W2 and the binding tube 3 tends to become acute during rotation. This will adversely affect the folding of the binding strip W at the folding channel 3123. In contrast, the angle change in the technical solution of this application, although fluctuating during movement, is not as significant. Finally, the advantage of a flatter trajectory closer to the needle plate 23 is that it facilitates the layout of the cutting mechanism. The working stroke of the cutting mechanism can be reduced and controlled within the space where the needle plate 23 is located. However, if designed to rotate around a fixed axis, the cutting mechanism must adopt a large travel stroke, extending beyond the needle plate 23 to the trajectory T2 to cut the binding strip W.

[0079] Figure 6 This is also a schematic diagram of a specific embodiment of this application. In this embodiment, the movement of the first rotating shaft O and the rotation of the binding tube 3 are linked by a set of mechanical mechanisms. Specifically, the binding strip guide device 1 includes a fixed guide component 11 and a movable component 13. The movable component 13 includes a rolling component 12 that is rolled on the guide component 11. The movable component also includes the binding tube 3, and the rolling component 12 and the first rotating shaft O of the binding tube 3 are connected in a transmission ratio within the movable component 13. The first rotating shaft O is fixed on the binding tube 3. Therefore, when the rolling component 12 rolls on the guide component 11, not only does the movement of the first rotating shaft O toward the concave side of the initial position of the fabric outlet 312 be realized through the movement of the movable component 13, but the rotation of the first rotating shaft O is also realized simultaneously, which is equivalent to the rotation of the binding tube 3. This scheme simultaneously fixes the movement relationship between the rolling component 12 and the binding tube 3, thereby solidifying the movement trajectory of the fabric outlet 312, which is beneficial to ensuring the stability of the system operation.

[0080] Figure 6 In this embodiment, the movable component 13 is coaxially and fixedly connected to the first rotating shaft O. This is a special case of a transmission connection, equivalent to a fixed 1:1 transmission ratio between the two. Furthermore, to simplify the transmission mechanism design as much as possible, especially to simplify the fit between the guide component 11 and the rolling component 12. Figure 6In the optimal embodiment, the guide component 11 extends along an arc path, with the arc axis of the guide component 11 being the second rotating shaft O2. The movable component 13 is provided with a swing arm 131, one end of which is rotatably disposed at the second rotating shaft O2, and the rolling component 12 is rotatably disposed at the other end of the swing arm 131 and rolls in cooperation with the guide component 11. In this scheme, since the arc paths of the swing arm 131 and the guide component 11 are concentric, the swing arm 131 can ensure normal contact and transmission between the guide component 11 and the rolling component 12 during movement. Therefore, there is no need to set other limiting mechanisms or other accessories to restrict and ensure the rolling cooperation between the rolling component 12 and the guide component 11. At this time, the movement path of the first rotating shaft O is an arc, but it is undeniable that it has a component of concave side movement towards the initial position of the edge-sealing cylinder 3. The guide component 11 and the rolling component 12 are preferably engaged by gears, wherein the guide component 11 is a rack and pinion, and the rolling component 12 is a gear that rolls with it. Specifically, in the above embodiments, since the guide component 11 has an arc path, it can be a rack extending from the arc path. To drive the movable component 13 and the edge-sealing cylinder 3, the rolling component 12 is typically used as the active component in the motion engagement, and the drive device is connected to the rolling component 12 via a transmission. The drive device and the rolling component 12 are coaxially fixed, for example, with a coaxially fixed stepper motor. However, considering that the guide component 11 is located at the moving end of the swing arm 131, an excessively large mass of the movable component would result in a large moment of inertia, which is detrimental to equipment motion control and high-speed operation. Therefore, a drive device such as a stepper motor is typically coaxially mounted at the second rotating shaft O2, and the drive device and the rolling component 12 are driven by a transmission system, such as a synchronous belt connecting the rotating shaft of the drive device and the rotating shaft of the rolling component 12.

[0081] For this preferred embodiment Figure 8 The results of the motion simulation are presented. The mechanism parameters used for the motion simulation are: swing arm 131 length 115mm, rolling component 12 radius 16mm, fabric outlet 312 in the binding tube 3 distance from the first rotating axis O 35mm, and the rolling component 12 and guide component 11 are internally engaged. Because the binding tube 3 has a certain eccentricity relative to the first rotating axis O on the movable component 13, the initial position of the fabric outlet 312 is not located on the x-axis. The initial angle of the fabric outlet 312 relative to the x-axis is approximately 20 degrees (0.1 rad). Based on actual conditions, the rotation of the binding tube 3 generally does not exceed 90 degrees (1.57 rad). The left figure shows the motion trajectory of the fabric outlet 312 with the second rotating axis O2 as the origin and the forward / backward direction as the x-axis. This is consistent with... Figure 7The conclusion is that it corresponds. In addition, the middle figure is a schematic diagram of the length of the feeding section W2 when the edge-sealing tube 3 rotates from 20 degrees to 90 degrees. It generally rises linearly, indicating that the feeding section W2 can always be pulled and kept in the reverse wrapping channel 3123 with a predetermined folded shape. The right figure shows the angle change curve between the feeding section W2 and the feeding channel 31 when the binding tube 3 rotates from 20 degrees to 90 degrees. The included angle only increases from 1.57 rad to 1.77 rad, that is, the actual range of the included angle is about 90-100 degrees. This is basically a state of maintaining a roughly right angle with respect to the side of the feeding channel 31 facing the reverse wrapping channel 3123. Therefore, it can ensure that the binding strip W forms the fold shape required by the reverse folding section W3 stably and evenly. However, if this included angle is too different from a right angle, the side 3121 and the ridge 3122 may not achieve the expected folding effect on the binding strip W. For example, if the binding tube 3 rotates around a fixed axis, the included angle between the feeding section W2 and the feeding channel 31 will eventually be close to 45 degrees. At this time, the binding strip W at the side 3121 may shrink, resulting in uneven folding.

[0082] In other embodiments, different transmission ratios between the movable component 13 and the first rotating shaft O can be set using several transmission devices. For example, in addition to achieving different transmission ratios, several gear sets may also be used to meet special requirements such as reversing the transmission of the first rotating shaft O. Such a design can ensure the coordination between the moving direction of the first rotating shaft O and the rotation direction of the edging cylinder 3, ensuring that the two move in a coordinated manner along a preset direction.

[0083] The guide assembly 11, through its cooperation with the rolling assembly 12, provides at least a translational component of the concave movement of the first rotating shaft O toward the initial position of the binding tube 3. The specific path of the guide assembly 11 does not require particular limitation of the cooperation mechanism. Although Figure 6 A technical solution with an arc-shaped path for the guide component 11 is presented, but the possibility of using a straight path or other curved paths is not excluded. For example... Figure 8 The image shows an example of linear motion.

[0084] Figure 9 This is a schematic diagram of the structure of the binding tube 3 of this utility model. Generally speaking, the technical solution of this application can be achieved by using the binding tube structure in the prior art. Generally speaking, the resistance between the binding strip W and the binding tube 3 can overcome its backlash, but in order to ensure that the backlash phenomenon occurs and to ensure its working stability, it is preferable to design a reliable anti-backlash mechanism. Figure 9 This is an embodiment of such a binding tube 3. The binding tube 3 has a feeding channel 31 for feeding the binding strip W and guiding the binding strip W to a preset cross section. A check plate 313 is provided in the feeding channel 31 to prevent the binding strip W from retracting in the opposite direction to the feeding direction.

[0085] During the process of retracting the binding cylinder 3 from the extended binding state to the retracted state in a compound motion mode to cut the binding strip W, since the binding strip W is still intact and can be driven forward or held by the feed tooth 24, the binding cylinder 3 is only equivalent to retracting relative to the binding strip W, or the binding strip W can be considered to be accelerating forward relative to the binding cylinder 3. At this time, the anti-return piece 313 basically does not hinder the forward movement of the binding strip W. When the binding cylinder 3 returns from the retracted state to the extended binding state, it should be noted that the end of the binding strip W has been cut off, so there is no possibility of fixing the end of the binding strip W or pulling it forward. If the binding cylinder 3 is reset to the binding state under the combined motion, the binding strip W will retract relative to the feeding channel 31. If there is no obstruction, the binding strip W may retract in the feeding channel 31 during the reset of the binding cylinder 3, causing the feed section W2, which has a good folded shape and direction and has been formed in the reverse wrapping channel 3123 in front of the outlet 312 after cutting, to retract into or behind the feeding channel 31. On the one hand, since the binding strip W is soft, this may lead to the problem of unstable feeding caused by difficulty in refeeding, consistent with the prior art. On the other hand, even if feeding can be relatively stable, the feed section W2 re-feeding from the outlet 312 does not actually have the advantages of the original feed section W2. It does not have the same folded shape as the expected reverse folding section W3, nor does it have the corresponding direction pointing to the side of the reverse wrapping channel 3123. The anti-reverse piece 313 can be as follows: Figure 9 The image shown is merely an elastic sheet, one end of which is pressed against the edge strip W along the forward direction of the edge strip W. When the edge strip W tends to retract, the edge strip W is further forced and thus prevented from moving because the contact end of the elastic sheet has an acute angle with the retraction direction.

[0086] Generally, in equipment such as overlock machines and sewing machines, a cutting mechanism 34 is required to match the overlock tube 3 to achieve controlled cutting of the overlock strip W. In the embodiments of this application, it is preferable to integrate the cutting mechanism 34 and the overlock tube 3 into the same device as the overlock strip guide device 1. In this case, the position between the cutting mechanism 34 and the overlock tube 3 is relatively fixed after proper adjustment and is not affected by the specific installation position, thus avoiding the inconvenience of adjustment caused by separate installation on the needle plate 23. The cutting mechanism 34 has a controllable moving cutting component 341, which is placed on the concave side below the initial position of the overlock tube 3 and can generate a movement component in the direction away from and towards the overlock tube 3. During its movement towards the overlock tube 3, the cutting component 341 contacts and cuts the overlock strip W. Figure 10In this embodiment, the cutting component 341 is preferably a hot-cutting blade 342, i.e., an electric heating wire disposed at the end of the cutting component 341, which melts the binding strip W when it contacts the binding strip W after heating. Generally, cutting the feed section W2 only requires the cutting mechanism 34 to move close to the binding cylinder 3 to contact the main fabric WW. In a specific technical solution, it is preferable to place the cutting mechanism 34 between the binding cylinder 3 and the presser foot 21, and to make the cutting mechanism 34 move along the concave-convex direction of the binding cylinder 3 in the binding state, or at least have a movement component in the concave-convex direction.

[0087] The technical solution of this application also includes an edge-binding machine 2 with an edge-binding strip guide device 1. Figure 11 as well as Figure 12 This is a structural schematic diagram of the edge-binding machine 2. Figure 12 for Figure 11 An enlarged schematic diagram of the machine head section. The binding strip guide device 1 is located on the needle plate 23 of the binding machine 2 and in the space behind the feed tooth 24. The fabric outlet 312 of its binding tube 3 extends forward to one side of the feed tooth 24 during binding. Optionally, a guide 25 is also provided between the feed tooth 24 and the fabric outlet 312 of the extended binding tube 3. The guide 25 is fixedly installed on the needle plate 23 and has a guide surface that protrudes from the needle plate 23. When the fabric outlet 312 moves away from the feed tooth 24 and the binding strip W is cut, the cut binding strip W, which has already been sewn together with the main fabric WW, still needs to be sewn to complete the finishing. At this time, although there is no support and guidance from the fabric outlet 312, the guide 25 can still guide the binding strip W with the required folded shape to be conveyed in an orderly and stable manner along the edge of the main fabric WW.

[0088] Figure 13 This is a schematic diagram of the improved binding strip guide device 1 of this application. Note that to ensure the proper positioning of the folded section W3, so that it smoothly enters between the feed dog 24 and the presser foot 21 after wrapping the main fabric WW, the fabric outlet 312 should be located almost simultaneously in the binding state, to the side of the feed dog 24, directly opposite the main fabric WW inlet. (Reference) Figure 11 This means that the binding tube 3 needs to be basically against the surface of the needle plate 23, and even the lower side 3121 of its fabric outlet 312 may be lower than the surface of the needle plate 23, so that the reverse binding channel 3123 can be directly opposite the inlet between the feed tooth 24 and the presser foot 21. It can also be determined that, for the binding tube 3, during the process of the binding strip W moving from the fabric inlet 311 to the fabric outlet 312, the width of the binding strip W remains unchanged, but the cross-sectional shape changes. In single-layer binding, it changes from a near-straight shape to a U-shaped fold. Figure 2 When double-layered binding, the original straight shape changes to a double fold. Figure 3 In any case, for the binding tube 3, this will inevitably result in the width of the inlet 311 along the height direction being significantly greater than the width of the outlet 312, i.e., as shown below. Figure 1 As shown. When the binding tube 3 rotates around the first pivot O, the lower end of the wider fabric inlet 311 may interfere with the surface of the needle plate 23. To avoid this problem, it is not enough for the binding tube 3 to merely move in the same horizontal plane when moving from the binding state to the retraction state; it also needs to move upward along its first pivot O so that, during retraction, the binding tube 3 rises in the height direction to increase the distance between itself and the needle plate 23, thereby preventing a collision between the fabric inlet 311 and the needle plate 23. In this embodiment, the height direction has a general meaning, that is, the direction upward along the needle when the sewing machine is installed in a posture known to those skilled in the art, with the base fixed at the bottom and the needle direction vertical. When restarting a round of binding operations, the binding tube 3 completes the reverse process of the above process, that is, it returns from the retraction state to the binding state. During this process, the binding tube 3 reverses and recovers around the first rotating axis O, and the movable component 13 also recovers. In addition, the binding tube 3 simultaneously descends along the first rotating axis O to restore the height of the binding state so as to be directly aligned with the feed inlet between the feed tooth 24 and the sewing needle 22.

[0089] Figure 13 In one implementation of this solution, the movement of the binding tube 3 in the height direction is achieved by the motion drive of the movable component 13. In this embodiment, the binding strip guide device 1 has a support surface 132 fixed below the binding tube 3. A portion of the lower surface of the binding tube 3 contacts the support surface 132. An elastic component 133 is provided between the binding tube 3 and the movable component 13, and the elastic component 133 presses the binding tube 3 against the surface of the support surface 132. Therefore, when the binding tube 3 moves, the lower surface of the binding tube 3 is always in contact with the support surface 132, that is, the binding tube 3 is floating in the height direction. Based on this, the height of the support surface 13 along the vertical projection path of the guide component 11 is varied, and its height gradually transitions from a lower position when the binding tube 3 is binding to a higher position when it is retracting. When the binding tube 3 moves, its shaft moves along the guide path of the guide assembly 11, which forces the binding tube 3 to change its height accordingly under the constraint of the support surface 132, thereby avoiding interference when retracting. At the same time, it ensures that the height is lower when binding than when retracting, and is in the correct position between the feed tooth 24 and the presser foot 21.

[0090] Figure 14In another embodiment of this scheme, also based on the lifting and lowering movement of the binding tube 3 driven by the movable component 13, a rotating component 134 linked to the rolling component 12 is provided on the movable component 13. The rotating component 134 is rotatably arranged around the first rotating axis O and can slide along the first rotating axis O. When the movable component 13 is driven to move by the rolling component 12, the rotating component 134 rotates around the axis in conjunction. The rotating component 134 is fixedly connected to the binding tube 3. The movable component 13 also includes a fixed component 135 fixed relative to the swing arm 131. The fixed component 135 and the rotating component 134 form a helical sliding pair, and its helical guide groove 1341 is centered on the first rotating axis O. The helical guide groove 1341 can be provided on the rotating component 134 or the fixed component 135. Thus, when the rotating component 134 rotates around the axis in conjunction, the binding tube 3 moves accordingly. At the same time, under the side effect of the helical movement, the rotating component 134 and the binding tube 3, which are fixed together, move up and down along the first rotating axis O.

[0091] Figure 15 In order to be in Figure 14 Alternatively, an improved embodiment based on other embodiments may be provided, offering a movable component 13 driven by a single power source and a shearing mechanism 34. The linkage between the two is achieved by providing a multi-link mechanism 4 between the shearing tube 3 and the shearing mechanism 34. See details for further information. Figure 16 The schematic diagram after concealing the shielding structure shows that the multi-link mechanism 4 includes a connecting rod 41 and a rocker arm 42. One end of the connecting rod 41 is rotatably connected to an eccentric position of the rolling assembly 12, and the other end is rotatably connected to one end of the rocker arm 42. The other end of the rocker arm 42 slides and rotates between the rocker arm 42 and the shearing mechanism 34. Specifically, this can be achieved by a sliding groove 421 with kinematic fit between the end of the rocker arm 42 and the shearing mechanism 34, and a sliding shaft 343 sliding within the sliding groove 421. The sliding shaft 343 and the sliding groove 421 can be respectively set on the shearing mechanism 34 and the rocker arm 42, or vice versa. The middle position of the connection between the rocker arm 42 and the connecting rod 41 and the connection between the rocker arm 42 and the shearing mechanism 34 is rotatably connected to the fixed end 422. As the rolling assembly 12 rotates, the rocker arm 42 is driven to rotate around the fixed end 422 via the aforementioned four-bar linkage. This rotation, through the sliding groove 421 and the sliding shaft 343, causes the shearing mechanism 34 to move along a predetermined path, such as the concave-convex direction of the binding tube 3 in the binding state. Besides being eccentrically connected to the rolling assembly 12, the connecting rod 41 can also be flexibly rotatably connected to other moving components within the same motion mechanism, such as the binding tube 3 and the rotating assembly 134, since the rolling assembly 12 is movably connected to the binding tube 3, the rotating assembly 134, and other moving components.

[0092] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model. Any modifications and improvements made to the technical solution of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A binding strip guide device, comprising a binding tube (3); The edge-binding cylinder (3) has a feeding channel (31) for conveying the edge-binding strip (W), and an inlet (311) and an outlet (312) are formed at both ends of the feeding channel (31); The fabric feeding channel (31) at the fabric outlet (312) has a U-shaped cross section, and the concave side of the binding tube (3) is defined based on the direction of the inner concave surface of the U-shaped cross section, and the convex side of the binding tube (3) is defined based on the direction of the outer convex surface of the U-shaped cross section. The binding tube (3) forms a reverse binding channel (3123) facing the concave side at the fabric outlet (312); In the edge-binding state, the front is defined by the direction of material output from the fabric outlet (312); the rear is defined by the opposite direction of material output from the fabric outlet (312). Its features are, The binding tube (3) has a first rotating shaft (O) behind the fabric outlet (312); When the binding tube (3) exits the binding state, the fabric outlet (312) rotates around the first rotating shaft (O) toward the convex side; and at the same time, the first rotating shaft (O) moves toward the concave side of the binding tube (3) in the binding state, so that while the binding tube (3) rotates, there is at least a motion component toward the concave side of the binding tube (3) in the binding state, thereby ensuring that the binding strip (W) always flows out along the reverse binding channel (3123) when the binding tube (3) exits the binding state.

2. The edge banding guide device as described in claim 1, characterized in that, The edge banding guide device (1) includes a fixed guide assembly (11) and a movable assembly (13); The movable component (13) includes a binding tube (3) and a rolling component (12) that is rolled on the guide component (11); in the movable component (13), the rolling component (12) is drivenly connected to the first rotating shaft (O) of the binding tube (3), and the first rotating shaft (O) is fixedly connected to the binding tube (3); Alternatively, the edge-binding tube (3) may also include a retaining groove (3124) formed on the concave side and extending outward along the direction of the reverse wrapping channel (3123). The retaining groove has a groove portion extending from the reverse wrapping channel (3123) and raised edges on both sides of the groove portion, the edges on both sides confining the edge-binding strip within the retaining groove (3124).

3. The edge banding guide device as described in claim 1, characterized in that, When exiting the binding state, the binding cylinder (3) moves upward along the axial direction of the first rotating shaft (O).

4. The edge banding guide device as described in claim 3, characterized in that, The edge banding guide device (1) includes a fixed guide component (11), a movable component (13), and a support surface (132) fixed below the edge banding tube (3); The active component (13) includes a binding tube (3) and a rolling component (12) that is rolled on the guide component (11); the rolling component (12) is connected to the first rotating shaft (O) of the binding tube (3) and the binding tube (3) is circumferentially fixed to the first rotating shaft (O); The lower surface of the binding tube (3) is in contact with the support surface (132). An elastic component (133) is provided between the binding tube (3) and the movable component (13). The elastic component (133) presses the binding tube (3) against the surface of the support surface (132) along the axial direction of the first rotating shaft (O). The support surface (132) has a varying height so that the binding tube (3) can move up and down when it slides on the support surface (132).

5. The edge banding guide device as described in claim 2, characterized in that, The movable component (13) is coaxially and fixedly connected to the first rotating shaft (O); Alternatively, when the binding tube (3) exits the binding state, the rolling component (12) rolls along an arc path on the guide component (11) to make the moving component (13) move toward the concave side of the binding tube (3) in the binding state; Alternatively, when the binding tube (3) exits the binding state, the rolling component (12) rolls along a straight path on the guide component (11) to make the moving component (13) translate towards the concave side of the binding tube (3) in the binding state; Alternatively, the guide component (11) is a rack, and the movable component (13) is a gear, the gear meshing and rolling on the rack; Alternatively, it may also include a shearing mechanism (34) having a shearing component (341) capable of controlled movement; when the binding tube (3) exits the binding state, the shearing component (341) moves to contact the binding strip (W) and cuts the binding strip (W); it may also include a multi-link mechanism (4) including a link (41) and a rocker arm (42), one end of the link (41) being rotatably connected to the eccentric position of the rolling component (12), and the other end being rotatably connected to one end of the rocker arm (42), the other end of the rocker arm (42) sliding and rotating between the shearing mechanism (34).

6. The edge banding guide device as described in claim 2, characterized in that, The active component (13) is provided with a swing arm (131), one end of which is rotatably disposed at the second rotating shaft (O2). The rolling component (12) is rotatably disposed on the swing arm (131) and rolls in cooperation with the guide component (11). The center of the arc path coincides with the second rotating shaft (O2).

7. The edge banding guide device as described in claim 6, characterized in that, The active component (13) includes a drive device (14) for driving the active component (13) to roll.

8. The edge banding guide device as described in claim 7, characterized in that, The drive device (14) and the rolling assembly (12) are fixed coaxially; Alternatively, the driving device (14) is coaxially arranged with the second rotating shaft (O2), and the driving device (14) is connected to the rolling assembly (12) in a transmission manner.

9. The binding strip guide device according to any one of claims 1-8, characterized in that, A check piece (313) is provided in the fabric feeding channel (31) of the binding tube (3). The check piece (313) is used to prevent the binding strip (W) from retracting in the opposite direction to the conveying direction.

10. The edge banding guide device as described in claim 9, characterized in that, The check sheet (313) is an elastic sheet, and one end of the elastic sheet is pressed against the edge strip (W) along the conveying direction of the edge strip (W).

11. The binding strip guide device according to any one of claims 1-8, characterized in that, It also includes a shearing mechanism (34) having a shearing assembly (341) capable of controlled movement; When the binding tube (3) exits the binding state, the cutting component (341) moves to contact the binding strip (W) and cuts the binding strip (W).

12. An edge-binding machine, characterized in that, Includes the binding strip guide device as described in any one of claims 1-11.

13. The edge-binding machine as described in claim 12, characterized in that, The binding machine (2) has a reciprocating feed tooth (24) on its needle plate (23). The binding strip guide device (1) is located behind the feed tooth (24). The binding cylinder (3) extends forward to the feeding side of the feed tooth (24) in the binding state.

14. The edge-binding machine as described in claim 13, characterized in that, A guide (25) is fixedly installed on the needle plate (23). The guide (25) is located between the feed tooth (24) and the fabric outlet (312) of the extended binding tube (3). The guide (25) is used to guide the binding strip (W) into the feed tooth (24).

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