A double-dash folding device

Abstract

This utility model discloses a double-dart folding device, relating to the field of garment processing technology. It includes a first folding mechanism, a folding mechanism, and a second folding mechanism. The first folding edge of the first folding plate forms a first fold in the fabric for sewing with a first thread. The second folding edge of the second folding plate forms a second fold in the fabric for sewing with a second thread. When the fabric is initially placed, the first thread is outside the range of the second folding plate, and the second folding plate does not affect the sewing process of the first thread. The folding piece is located in the fold formed by the fabric between the first and second folding plates. After the first thread is sewn, a folding driver drives the folding piece to move horizontally, causing the first fold to open and exposing the position of the second thread, which then sews the fabric on both sides of the second folding plate. This device, through a series of coordinated actions, automatically completes the folding process of two folds, enabling automated double-dart sewing.

Description

Technical Field

[0001] This utility model relates to the field of garment processing technology, and more specifically to a double-dart folding device. Background Technology

[0002] In garment craftsmanship, "darting" refers to the process of folding and sewing together excess fabric from a piece of clothing or trousers to create a three-dimensional curved surface on the flat fabric, thereby conforming to the contours of the human body such as the chest, waist, and hips. It is a folding and sewing technique that transforms flat fabric into a three-dimensional shape.

[0003] Currently available automated dart-gathering mechanisms on the market only sew one dart; there are no automated devices that sew two darts consecutively. Sewing two darts separately requires high skill levels, involves numerous and complex procedures, is extremely inefficient, and is highly dependent on skilled workers, resulting in high manufacturing costs.

[0004] For those skilled in the art, how to automate the folding and sewing of the two gather-up darts is a technical problem that needs to be solved. Utility Model Content

[0005] The core of this utility model is to provide a double-dart folding device that can automatically realize the double-dart folding process of fabric. The specific solution is as follows:

[0006] A double-dart folding device, comprising:

[0007] The first folding mechanism includes a first folding plate and a first driver, wherein the first driver is used to drive the first folding plate to translate; the first folding edge of the first folding plate is used to form a first fold in the fabric for sewing with a first thread.

[0008] A folding mechanism includes a folding piece and a folding driver, wherein the folding driver is used to drive the folding piece to translate; the folding piece is used to fold the first fold after stitching.

[0009] The second folding mechanism includes a second folding plate, the second folding edge of which is used to form a second fold in the fabric for sewing with a second thread.

[0010] When the fabric is placed in its initial state, the first seam is located outside the range of the second folding plate; and the folding piece is located in the fold formed by the fabric between the first folding plate and the second folding plate.

[0011] Optionally, the first folding plate, the folding piece, and the second folding plate are arranged in a top-to-bottom order or in a bottom-to-top order.

[0012] Optionally, the second folding mechanism includes a second driver for driving the second folding plate to move vertically.

[0013] Optionally, the first folding mechanism, the folding mechanism, and the second folding mechanism are mounted on the support member.

[0014] Optionally, it also includes a base plate, the support member being mounted on the base plate via a third driver, the third driver being used to drive the support member to move vertically.

[0015] Optionally, an airlock cylinder is provided on the base plate, which is used to connect with the airlock shaft on the template machine's pressing frame to achieve fixation.

[0016] Optionally, a second sewing notch is provided on the second folding plate to avoid the second seam.

[0017] Optionally, it also includes an extrusion mechanism, which includes an extrusion plate and a fourth driver, the fourth driver being used to drive the extrusion plate to move vertically;

[0018] The extrusion plate is used to extrude the fabric from above.

[0019] Optionally, a clearance notch is provided at the edge of the first fold of the first fold plate, and a pressing protrusion is provided on the surface of the pressing sheet, with the pressing protrusion facing the clearance notch.

[0020] The extrusion protrusions cooperate with the base plate to extrude two layers of fabric to form the first fold, leaving space for the first fold to be moved and removed.

[0021] Optionally, the extrusion piece has a clearance notch for avoiding the first and second seams.

[0022] This invention provides a double-dart folding device. The first fold edge of a first folding plate forms a first fold in the fabric for sewing with a first thread. The second fold edge of a second folding plate forms a second fold in the fabric for sewing with a second thread. When the fabric is initially placed, the first thread is outside the range of the second folding plate, and the second folding plate does not affect the sewing process of the first thread. A folding piece is located within the fold formed by the fabric between the first and second folding plates. After the first thread is sewn, a folding actuator drives the folding piece to move horizontally, causing the first fold to open and exposing the position of the second thread, which then sews the fabric on both sides of the second folding plate. This device, through a series of coordinated actions, automatically completes the folding process of the two folds, enabling automated double-dart sewing. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is an isometric view of the overall structure of the double-dip folding device of this utility model;

[0025] Figure 2A A schematic diagram of the first embodiment showing the relative relationship between the first folding plate, the folding piece, and the second folding plate;

[0026] Figure 2B This is a schematic diagram of a second embodiment showing the relative relationship between the first folding plate, the folding piece, and the second folding plate.

[0027] Figure 3A This is an axonometric view of the structure of the first folding mechanism;

[0028] Figure 3B for Figure 3A A magnified view of a section within the dashed circle.

[0029] Figure 4 Axonometric drawing of the folding mechanism;

[0030] Figure 5 This is an axonometric view of the second folding mechanism.

[0031] Figure 6 This is the structural axonometric drawing of the base plate;

[0032] Figure 7A An isometric view of the extrusion mechanism from an oblique, upward perspective.

[0033] Figure 7B Axonometric view of the extrusion mechanism from a downward angle;

[0034] Figure 8 This is a schematic diagram of the double-dip folding device of this utility model in conjunction with the template machine;

[0035] Figure 9 This is a partial schematic diagram of the fabric in its flattened state.

[0036] The image includes:

[0037] First folding mechanism 10; first folding plate 110; first folding edge 111; clearance notch 112; first actuator 120;

[0038] Folding mechanism 20; Folding piece 210; Folding actuator 220;

[0039] Second folding mechanism 30; second folding plate 310; second folding edge 311; second sewing notch 312; second actuator 320;

[0040] Base plate 40; air lock cylinder 410;

[0041] Extrusion mechanism 50; extrusion plate 510; extrusion protrusion 511; clearance notch 512; fourth actuator 520;

[0042] Support component 60; Third drive 610; Template machine pressing frame 70; Air lock shaft 710;

[0043] Fabric X; First seam position A; Second seam position B; First step translation ①; Second step translation ②; First layer of fabric I; Second layer of fabric II; Third layer of fabric III; Fourth layer of fabric IV. Detailed Implementation

[0044] To enable those skilled in the art to better understand the technical solution of this utility model, the following will provide a detailed description of the double-dash folding device of this utility model in conjunction with the accompanying drawings and specific embodiments.

[0045] Combination Figure 1 As shown, the present invention provides a double-folding device including a first folding mechanism 10, a folding mechanism 20, and a second folding mechanism 30. The first folding mechanism 10 is used to form a first fold, and the second folding mechanism 30 is used to form a second fold.

[0046] Combination Figure 3A As shown, the first folding mechanism 10 includes a first folding plate 110 and a first driver 120. The first folding plate 110 has a plate-like structure, and the first driver 120 provides driving force to the first folding plate 110, which can drive the first folding plate 110 to translate along the X-axis. The first folding plate 110 is correspondingly provided with a slide rail to provide guidance, so that the first folding plate 110 can translate smoothly.

[0047] The first fold edge 111 of the first fold plate 110 is used to form a first fold in the fabric for sewing with a first thread; when forming the first fold, the fabric is folded 180° around the first fold edge 111 to form two layers, and the folded fabric contacts the upper and lower surfaces of the first fold plate 110 respectively, and the first fold edge 111 is used to position and form the first fold.

[0048] After the first fold is formed, the two layers of fabric that formed the first fold are sewn together to secure them, thus achieving the first dart.

[0049] Combination Figure 4As shown, the folding mechanism 20 includes a folding plate 210 and a folding driver 220. The folding plate 210 has a plate-like structure and is parallel to the first folding plate 110. The folding driver 220 provides driving force to the folding plate 210, which can drive the folding plate 210 to translate along the X-axis. The folding plate 210 is correspondingly provided with a slide rail to provide guidance, so that the folding plate 210 can translate smoothly.

[0050] After the first fold is sewn to complete the first dart, before sewing the second dart, the first fold after sewing is folded over by the fold piece 210 so that the two layers of fabric of the first dart do not overlap with the seam of the second dart.

[0051] Combination Figure 5 As shown, the second folding mechanism 30 includes a second folding plate 310, which is parallel to the folding piece 210 and the first folding plate 110. The second folding edge 311 of the second folding plate 310 is used to form a second fold in the fabric for sewing with a second thread.

[0052] When the second fold is formed, the fabric is folded 180° around the edge 311 of the second fold to form two layers. The folded fabric contacts the upper and lower surfaces of the second fold plate 310 respectively. The edge 311 of the second fold is used to position and form the first fold.

[0053] After forming the second fold, the two layers of fabric forming the second fold are sewn together to secure them, thus achieving the second dart.

[0054] Combination Figure 2A , Figure 2B As shown, in the initial state, the Z-axis positions (vertical height positions) of the first folding plate 110, the folding piece 210, and the second folding plate 310 are different, and the folding piece 210 is located between the first folding plate 110 and the second folding plate 310.

[0055] When fabric X is placed in its initial state, the placement process can be completed manually. Fabric X is folded into four layers: I, II, III, and IV. Layers I and II are respectively attached to the two surfaces of the first folding plate 110, forming a first fold around the edge 111 of the first fold. Layers III and IV are respectively attached to the two surfaces of the second folding plate 310, forming a second fold around the edge 311 of the second fold. Layers II and III contact the two surfaces of the folding piece 210, and are tensioned by the edges of the folding piece 210. After the fabric is folded into its initial state according to layers I, II, III, and IV, tension needs to be applied to the edges of layers I and IV to tighten the fabric, causing the fabric to form a first fold at the edge 111 of the first fold and a second fold at the edge 311 of the second fold.

[0056] There is a certain gap between position A of the first seam (which sews and secures layers I and II) and the first fold seam, and a certain gap between position B of the second seam (which sews and secures layers III and IV) and the second fold seam. (Combined) Figure 9 As shown, when the first seam is sewn to the fabric for the first dart, the two triangular areas of the folded fabric layers I and II are stacked and fixed; when the second seam is sewn to the fabric for the second dart, the two triangular areas of the folded fabric layers III and IV are stacked and fixed.

[0057] Combination Figure 2A , Figure 2B As shown, when the fabric is placed in the initial state, the first seam position A is outside the range of the second fold plate 310, that is, the projection of the first seam position A along the Z-axis is outside the range of the second fold plate 310. At this time, when the sewing equipment sews the first seam, only the two layers of fabric I and II are sewn and fixed.

[0058] The folding piece 210 is located in the fold formed by the fabric (layers II and III) between the first folding plate 110 and the second folding plate 310. After the first seam secures layers I and II and completes the first dart, the folding piece 210 pulls the fabric along the X-axis, causing the layers I and II of the first dart to move and avoid the second seam position B. When the second seam is subsequently sewn to complete the second dart, only layers III and IV are sewn and secured. It should be noted that before the folding piece 210 pulls the fabric along the X-axis, the first folding plate 110 is first moved along the X-axis so that the first folding plate 110 avoids the second seam position B. That is, after the first folding plate 110 moves, the projection of the second seam position B along the Z-axis is outside the range of the first folding plate 110.

[0059] This utility model's double-dart folding device, through the coordinated action of the first folding plate 110 and the flipping piece 210, automatically completes the folding process of two seams, allowing the fabric to be folded according to the requirements of the two darts. This allows sewing equipment to sew two seams separately, automating the two-dart sewing process and reducing manual operation. Only manual intervention is required to fold the fabric to its initial state; no manual intervention is needed during the material feeding and position changes. This device ensures precise positioning of the two darts, improving the processing accuracy of the two darts.

[0060] Based on the above scheme, this utility model provides two specific structural forms: 1) the first folding plate 110, the folding piece 210, and the second folding plate 310 are arranged in order from top to bottom; 2) the first folding plate 110, the folding piece 210, and the second folding plate 310 are arranged in order from bottom to top.

[0061] exist Figure 2AIn the structure shown, the first folding plate 110, the folding piece 210, and the second folding plate 310 are arranged in a top-to-bottom order. When the fabric is placed in the initial state, four layers of fabric (ⅠⅡⅢⅣ) are formed from bottom to top.

[0062] exist Figure 2B In the structure shown, the first folding plate 110, the folding piece 210, and the second folding plate 310 are arranged in order from bottom to top. When the fabric is placed in the initial state, four layers of fabric, I, II, III, and IV, are formed from top to bottom.

[0063] Regardless of the arrangement order, in the initial state, the first seam position A of the two layers of fabric (ⅠⅡ) for the first seam to be sewn together must be outside the range of the second fold plate 310.

[0064] exist Figure 2A , Figure 2B In the structure shown, both the first fold plate 110 and the second fold plate 310 move to the left along the X-axis; for the trousers, two darts need to be sewn onto the left and right sides of the body respectively. Figure 2A , Figure 2B When the indicated direction of movement applies to the left main body, the first folding plate 110 and the second folding plate 310 applied to the right main body both move to the right along the X-axis. The two different main bodies require a symmetrical movement structure for the mirror barrel.

[0065] The second folding mechanism 30 includes a second driver 320, which drives the second folding plate 310 to move vertically, in conjunction with... Figure 5 As shown, the second driver 320 drives the second folding plate 310 to move along the Z-axis. The second folding plate 310 only performs one-dimensional motion and does not need to move along the X-axis and Y-axis.

[0066] The movement direction of the second folding plate 310 is perpendicular to its surface. When the second folding plate 310 moves along the Z-axis, it can move closer to or further away from the first folding plate 110 and the folding piece 210. Before placing the fabric, the second folding plate 310 moves away from the first folding plate 110 and the folding piece 210 along the Z-axis to facilitate the folding and placement of the fabric. After the folding and placement of layers I, II, and III of the fabric are completed, the second folding plate 310 moves closer to the first folding plate 110 and the folding piece 210 along the Z-axis. The second folding plate 310 presses against the folding piece 210, and then the fabric is folded to form the fourth layer of fabric.

[0067] Of course, in addition to moving the second folding plate 310 along the Z-axis, the first folding plate 110 and the folding piece 210 can also be moved synchronously along the Z-axis to achieve the same placement process. For example, for Figure 2BIn the structure shown where the first folding plate 110 and the folding piece 210 are located above the second folding plate 310, the first folding mechanism 10 and the folding mechanism 20 can be installed on the vertical moving structure to drive the first folding plate 110 and the folding piece 210 to move closer to or further away from the second folding plate 310 simultaneously.

[0068] Combination Figure 1 As shown, the first folding mechanism 10, the folding mechanism 20, and the second folding mechanism 30 are mounted on the support member 60, which serves as the bracket for the three components, forming an integrated assembly.

[0069] Combination Figure 1 , Figure 6 As shown, the double-dart folding device of this utility model also includes a base plate 40. The base plate 40 is a plate-shaped structure located below the first folding mechanism 10, the folding mechanism 20, and the second folding mechanism 30. The base plate 40 is used to support the bottommost layer of fabric, such as... Figure 2A As shown, the base plate 40 supports the first layer of fabric from below; as Figure 2B As shown, the base plate 40 supports the IV layer of fabric from below.

[0070] The support member 60 is mounted on the base plate 40 via the third driver 610. The third driver 610 is used to drive the support member 60 to move vertically, thereby driving the first folding mechanism 10, the folding mechanism 20, and the second folding mechanism 30 to move vertically synchronously.

[0071] When placing the fabric, the third driver 610 drives the support 60 to move vertically away from the base plate 40, and the second driver 320 drives the second folding plate 310 away from the folding piece 210, thus facilitating the folding and placement of the fabric.

[0072] Combination Figure 6 , Figure 8 As shown, an airlock cylinder 410 is installed on the base plate 40. The airlock cylinder 410 is used to connect with the airlock shaft 710 on the template machine pressing frame 70 to achieve fixation. This device can be applied to the template machine and has universality. It can reuse the template machine to drive the entire double-dip folding joint device to move.

[0073] Combination Figure 5 As shown, a second sewing notch 312 is provided on the second fold plate 310 to avoid the second seam. The second seam is sewn and fixed to the two layers of fabric III and IV at the second sewing notch 312. That is, before sewing the second seam, the second fold plate 310 remains stationary, and the edge 311 of the second fold of the second fold plate 310 always contacts the shaping second fold.

[0074] There is an angle between the second fold edge 311 and the second sewing notch 312, and they intersect at the end opening of the second sewing notch 312 to facilitate sewing and forming a triangular dart structure.

[0075] In addition to providing a second sewing notch 312 at the edge of the second folding plate 310, a horsehair lining can also be provided at the edge of the second folding plate 310.

[0076] Combination Figure 1 As shown, the double-folding device of this utility model also includes a pressing mechanism 50, which is located above the first folding mechanism 10, the folding mechanism 20, the second folding mechanism 30, and the base plate 40.

[0077] Combination Figure 7A , Figure 7B As shown, the extrusion mechanism 50 includes an extrusion plate 510 and a fourth driver 520. The extrusion plate 510 has a flat plate structure, and the fourth driver 520 is used to drive the extrusion plate 510 to move vertically (Z-axis). The extrusion plate 510 can move vertically relative to the support member 60. When the support member 60 moves vertically, it drives the first folding plate 110, the folding plate 210, the second folding plate 310, and the extrusion plate 510 to move synchronously.

[0078] The extrusion plate 510 is used to extrude the fabric from above, while the base plate 40 supports the fabric from below. When sewing the first and second seams, the extrusion plate 510 and the base plate 40 work together to extrude the fabric from both the top and bottom sides, positioning the fabric and preventing it from shifting during the sewing process and causing the seam to become skewed.

[0079] An avoidance notch 512 is provided through the surface of the extrusion sheet 510 to avoid the first seam and the second seam. The width of the avoidance notch 512 is greater than the distance between the first seam and the second seam. When the extrusion sheet 510 presses down on the fabric, the position A of the first seam and the position B of the second seam are both located within the avoidance notch 512.

[0080] Combination Figure 3A , Figure 3B As shown, a clearance notch 112 is provided at the first fold edge 111 of the first fold plate 110. The number and form of the clearance notches 112 are not limited. Figure 3B The image shows five independent, spaced U-shaped gaps, which could also be a single, large U-shaped gap. The clearance gap 112 vertically penetrates the first fold plate 110.

[0081] Combination Figure 7BAs shown, the surface of the extrusion sheet 510 is provided with an extrusion protrusion 511, and the protrusion height of the extrusion protrusion 511 is greater than the thickness of the first folding plate 110. The extrusion protrusion 511 is directly opposite the clearance notch 112. When the extrusion sheet 510 approaches the first folding plate 110, the extrusion protrusion 511 extrudes the two layers of fabric (I and II). The extrusion protrusion 511, through the clearance notch 112, cooperates with the upper surface of the base plate 40 to extrude the fabric.

[0082] The extrusion protrusion 511 and the base plate 40 work together to form two layers of fabric (I and II layers of fabric) for the first fold. Since the protrusion height of the extrusion protrusion 511 is greater than the thickness of the first fold plate 110, the distance between the lower surface of the extrusion piece 510 and the upper surface of the base plate 40 is greater than the thickness of the first fold plate 110, leaving space for the first fold plate 110 to be moved and removed.

[0083] Before sewing the first seam, the extrusion plate 510 moves downwards towards the base plate 40, and the extrusion protrusion 511 and the base plate 40 clamp the first fold (two layers of fabric, I and II), positioning the first fold. Then, the first fold plate 110 moves away from the first fold along the X-axis, so that the first seam is not interfered with by the first fold plate 110 when sewing the first seam. After the first seam is sewn, the extrusion plate 510 moves upwards away from the base plate 40, and the folding plate 210 pulls the sewn first fold away from the position B of the second seam.

[0084] During the process of sewing the first seam, in addition to moving the first fold plate 110 in advance to avoid the first seam, a horsehair lining can also be placed at the edge 111 of the first fold of the first fold plate 110. The first fold is positioned by the horsehair lining, so it is not necessary to remove the first fold plate 110 before sewing the first seam.

[0085] by Figure 1 , Figure 2A The structure is presented in sequence, and the specific action process is explained in conjunction with it:

[0086] First, lift the extrusion sheet 510, then lift the second folding plate 310.

[0087] Place the fabric and fold it to form the first layer of fabric I, the second layer of fabric II, and the third layer of fabric III.

[0088] The second fold plate 310 is pressed down, folding the fabric to form the fourth layer of fabric IV. Pull the two ends of the fabric to make it taut.

[0089] The extrusion plate 510 presses down, and the extrusion protrusion 511 and the base plate 40 work together to extrude the two layers of fabric (I and II). After the extrusion plate 510 presses down, the two ends of the fabric are released.

[0090] The first folding plate 110 is moved out by translation (the first translation is performed along arrow ①). The first folding plate 110 is moved to a position outside the first seam position A and the second seam position B, without interfering with the sewing of the first and second seams.

[0091] The entire double-dart folding device is moved to the template machine to begin sewing the first seam for the first dart gathering.

[0092] Lift and loosen the two layers of fabric (ⅠⅡ) by pressing sheet 510. Move folded sheet 210 horizontally (following arrow ② for the second horizontal movement), pulling the first gather-up dart to a position that avoids the second seam B.

[0093] The entire double-dart folding device is moved to the template machine to begin sewing the second seam for the second dart gathering.

[0094] Sewing is complete; collect the materials.

[0095] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A double fold and crease saving device, characterized in that, include: The first folding mechanism (10) includes a first folding plate (110) and a first driver (120), wherein the first driver (120) is used to drive the first folding plate (110) to translate; the first folding edge (111) of the first folding plate (110) is used to form a first fold in the fabric for sewing with a first thread; The folding mechanism (20) includes a folding piece (210) and a folding driver (220), wherein the folding driver (220) is used to drive the folding piece (210) to translate; the folding piece (210) is used to fold the first fold after sewing; The second folding mechanism (30) includes a second folding plate (310) and a second folding edge (311) of the second folding plate (310) for forming a second fold in the fabric for sewing with a second thread. When the fabric is placed in the initial state, the first seam is located outside the range of the second fold plate (310); and the fold piece (210) is located in the fold formed by the fabric between the first fold plate (110) and the second fold plate (310).

2. The dual folding and creasing apparatus of claim 1, wherein The first folding plate (110), the folding piece (210), and the second folding plate (310) are arranged in a top-down order or in a bottom-up order.

3. The dual folding and creasing apparatus of claim 2, wherein, The second folding mechanism (30) includes a second driver (320) for driving the second folding plate (310) to move vertically.

4. The dual folding and creasing apparatus of claim 3, wherein, The first folding mechanism (10), the folding mechanism (20), and the second folding mechanism (30) are mounted on the support member (60).

5. The dual folding and creasing apparatus of claim 4, wherein, It also includes a base plate (40), and the support member (60) is mounted on the base plate (40) by a third driver (610) for driving the support member (60) to move vertically.

6. The dual folding and creasing apparatus of claim 5, wherein, An airlock cylinder (410) is provided on the base plate (40). The airlock cylinder (410) is used to connect with the airlock shaft (710) on the template machine pressing frame (70) to achieve fixation.

7. The dual folding and creasing apparatus of claim 1, wherein, The second folding plate (310) is provided with a second sewing notch (312) for avoiding the second seam.

8. The double tuck folding and creasing device of any one of claims 1 to 7, wherein, It also includes an extrusion mechanism (50), which includes an extrusion plate (510) and a fourth driver (520) for driving the extrusion plate (510) to move vertically; The extrusion plate (510) is used to extrude the fabric from above.

9. The dual folding and creasing apparatus of claim 8, wherein, An avoidance notch (112) is provided at the first fold edge (111) of the first fold plate (110), and an extrusion protrusion (511) is provided on the surface of the extrusion piece (510), with the extrusion protrusion (511) facing the avoidance notch (112). The extrusion protrusion (511) and the base plate (40) work together to extrude two layers of fabric to form the first fold, leaving space for the first fold plate (110) to be moved and removed.

10. The dual folding and creasing apparatus of claim 8, wherein, The extrusion piece (510) has a clearance notch (512) for avoiding the first and second sutures.

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