A guide for sewing arc-shaped pockets and a sewing machine

Abstract

The present application belongs to the technical field of sewing machines, and particularly relates to a cloth guide for sewing an arc-shaped pocket and a sewing machine. The cloth guide comprises a cloth guide base, the cloth guide base is provided with cloth guide clamps for guiding two pieces of cloth with locked edges to a sewing machine for sewing, the cloth guide clamps are composed of left and right oppositely arranged first and second elastic sheets, a vertical clamping gap is formed between the first and second elastic sheets, the clamping gap is matched with the locked edges of the two pieces of cloth, and the locked edges of the cloth are kept in a vertical state during sewing; an arc-shaped cloth guide surface is formed on the front side and top of the cloth guide clamps, the arc-shaped cloth guide surface is a continuous arc surface extending from the front side to the top, and is used for guiding the sewing track of the arc-shaped pocket. The cloth guide for sewing an arc-shaped pocket and the sewing machine provided by the present application are used for sewing an arc-shaped pocket with locked edges, and can ensure that the sewing thread is accurately located at the middle position of the two pieces of cloth.

Description

Technical Field

[0001] This invention belongs to the technical field of sewing machines, specifically relating to a fabric guide and sewing machine for sewing curved pockets. Background Technology

[0002] In garment manufacturing, it is often necessary to sew two pieces of fabric with overlock edges together. For example, in processes such as sewing French pockets or piecing together shirt panels, the edges of two pieces of fabric, after being overlocked, need to be sewn together. In traditional sewing methods, the overlock edges of the two pieces of fabric are overlapped and sewn together from top to bottom by a sewing machine. Because the overlock edge has a certain thickness and stiffness, the two pieces of fabric tend to skew to one side during sewing, causing the seam to deviate from the center, resulting in an uneven seam and affecting product quality and aesthetics.

[0003] There are already some auxiliary sewing devices in the prior art. For example, Chinese invention patent CN212834442U (publication date 2021.03.30) discloses a transmission device for facilitating bag sewing, including an upper clamping plate, a lower clamping plate, and an arc-shaped guide plate. The two ends of the arc-shaped guide plate are connected to the upper clamping plate and the lower clamping plate respectively. The upper clamping plate and the lower clamping plate are inclined and one end forms a material outlet and the other end forms a material inlet. The arc-shaped guide plate is located at the material inlet. A guide rod is fixed to the end of the upper clamping plate and the lower clamping plate near the material inlet. An orifice-shaped rod is fixed on the guide rod.

[0004] However, existing auxiliary sewing devices cannot solve the problem of skewing when sewing overlock fabric. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a fabric guide and sewing machine for sewing curved pockets, which can ensure that the seam is accurately positioned in the middle of the two pieces of fabric when sewing curved pockets with overlock edges.

[0006] To solve the above-mentioned technical problems, the objective of this invention is achieved through the following technical solution: A fabric guide for sewing curved pockets includes a fabric guide base. The fabric guide base is provided with a fabric guide clip for guiding two pieces of fabric with overlock edges to a sewing machine for sewing. The fabric guide clip consists of a first elastic piece and a second elastic piece arranged opposite each other, forming a vertical clamping gap between the first and second elastic pieces. The clamping gap is adapted to the overlock edges of the two pieces of fabric, ensuring that the overlock edges remain vertical during sewing. The front and top sides of the fabric guide clip are formed with curved fabric guide surfaces, which are continuous arc surfaces extending from the front side to the top surface, used to guide the sewing trajectory of the curved pocket.

[0007] As a further improvement of the present invention, the arc-shaped guide fabric surface is an outwardly convex long arc, the rear side of the guide fabric clip is formed with an inwardly concave small arc surface, and the sewing point of the sewing machine is located on the rear side adjacent to the end of the guide fabric clip.

[0008] As a further improvement of the present invention, the upper end of the guide cloth base is provided with a mounting protrusion, and the bottoms of the first elastic sheet and the second elastic sheet are respectively fixed to the two sides of the mounting protrusion by fasteners.

[0009] As a further improvement of the present invention, the first elastic sheet and the second elastic sheet are provided with corresponding through holes in the middle, and a clamping locking member is inserted in the through hole. The clamping locking member drives the first elastic sheet and the second elastic sheet to move closer to each other, so that the distance between the first elastic sheet and the second elastic sheet gradually decreases from bottom to top. The distance at the bottom is determined by the width of the mounting protrusion. The middle part is narrowed by the clamping locking member, and the top free end is further narrowed under the action of elastic deformation.

[0010] As a further improvement of the present invention, the clamping gap at the top of the first elastic sheet and the second elastic sheet is less than the sum of the thicknesses of the fabric overlock, and the first elastic sheet and the second elastic sheet clamp the overlock by their own elastic deformation.

[0011] As a further improvement of the present invention, it also includes a guide rod, which is arranged vertically, and the guide base is fixed to the upper end of the guide rod. The guide rod is connected to a driving device for driving the guide to move vertically; the driving device can be a cylinder or the like.

[0012] The present invention also provides a sewing machine equipped with the aforementioned fabric guide. The sewing machine is side-mounted and includes a sewing head and a sewing base. A vertical sewing operation gap is formed between the sewing head and the sewing base. The fabric guide is disposed between the sewing head and the sewing base, and the clamping gap of the fabric guide clamps the overlock edge of two pieces of fabric. The presser foot on the sewing head moves from one side of the sewing head to the other side of the sewing base and presses the fabric guided by the fabric guide onto the feed dog of the sewing base. The sewing needle on the sewing head reciprocates horizontally to sew the fabric.

[0013] As a further improvement of the present invention, the sewing machine further includes a cloth-pulling mechanism, which is disposed on the side of the cloth guide away from the sewing needle, and the cloth-pulling mechanism assists in pulling the cloth to move.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention provides a fabric guide for sewing curved pockets. The first and second elastic sheets, which are arranged opposite each other, clamp the overlock edge, so that the overlock edge always remains vertical during the sewing process and will not deviate to either side. This ensures that the needle is accurately sewn along the middle position of the two pieces of fabric, resulting in neat and beautiful stitches.

[0015] 2. This invention features an arc-shaped guide surface on the elastic sheet, which guides the arc-shaped sewing trajectory, making it particularly suitable for sewing products with arc-shaped contours, such as French pockets. By changing the elastic sheet with different curvatures, different sewing needs can be met.

[0016] 3. The front side of the guide cloth clip of the present invention is formed with an outwardly convex long arc. The outwardly convex long arc constitutes an arc-shaped template for the fabric overlock. When the fabric travels along the arc surface, its overlock is forced to bend to match the curvature of the arc surface, thereby determining the shape accuracy of the arc stitch by the curvature of the guide cloth clip, without depending on the operator's technique.

[0017] 4. Based on the convex long arc, the present invention has a concave small arc surface formed on the rear side, which reduces the area occupied by the end of the guide cloth clamp in the horizontal direction, making room for the sewing machine head, presser foot and sewing needle, and avoiding interference between the guide cloth clamp and the moving parts of the sewing machine during the sewing process.

[0018] 5. The present invention also provides a sewing machine for sewing curved pockets. By using a side-mounted sewing machine, the needle is positioned horizontally, which is reasonably matched with the vertical clamping gap of the fabric guide and the vertical state of the fabric. This achieves a working method in which the overlock is vertically centered, the fabric is horizontally pressed, and the needle is horizontally sewn. The structure is reasonable and the operation is convenient. Attached Figure Description

[0019] Figure 1 This is a perspective view of the fabric guide of the present invention; Figure 2 It is a sewing machine equipped with a fabric guide; Reference numerals: 1. Guide base; 2. First elastic piece; 3. Second elastic piece; 4. Clamping gap; 5. Arc-shaped guide surface; 6. Concave small arc surface; 7. Mounting protrusion; 8. Clamping locking element; 9. Guide rod; 10. Machine head; 11. Machine base; 12. Presser foot; 13. Feed dog; 14. Sewing needle. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-2 : Example 1 Fabric guide for sewing curved pockets Comparison Appendix Figure 1 This embodiment provides a fabric guide for sewing curved pockets, including a fabric guide base 1. The fabric guide base 1 is provided with a fabric guide clip, which consists of a first elastic piece 2 and a second elastic piece 3 arranged opposite each other. A vertical clamping gap 4 is formed between the first elastic piece 2 and the second elastic piece 3, and the clamping gap 4 is adapted to the overlock edge of the two pieces of fabric, so that the overlock edge of the fabric remains vertical during sewing.

[0021] The front and top sides of the guide fabric clip are formed with arc-shaped guide fabric surfaces 5, which are continuous arc surfaces extending from the front side to the top surface, used to guide the sewing trajectory of the arc-shaped pocket. The curvature of the arc matches the curvature of the arc-shaped pocket to be sewn, and the fabric is smoothly guided as it travels along the arc surface, resulting in an arc-shaped stitch. By replacing elastic pieces with different arc-shaped guide fabric surfaces 5, sewing needs with different curvatures can be accommodated. In this embodiment, the arc-shaped guide surface 5 is an outwardly convex long arc, and the rear side of the guide clip is formed with an inwardly concave small arc surface 6, which reduces the area occupied by the end of the guide clip in the horizontal direction, making room for the sewing machine head, presser foot and sewing needle, and avoiding interference during sewing.

[0022] The sewing point of the sewing machine is located on the rear side of the end of the guide cloth clamp, so that the overlock edge is immediately sewn by the needle after it is released from the clamping gap. The free travel of the overlock edge is extremely short, which can prevent the overlock edge from deflecting due to its own elasticity or hardness after it is released from the constraint, and ensure that the needle always passes through the middle position of the two overlock edges.

[0023] The upper end of the guide cloth base 1 is provided with a mounting protrusion 7. The bottoms of the first elastic sheet 2 and the second elastic sheet 3 are respectively fixed to the left and right sides of the mounting protrusion 7 by fasteners. The first elastic sheet 2 and the second elastic sheet 3 are integrally formed metal sheets, such as spring steel sheets, which have good elasticity and durability.

[0024] The first elastic sheet 2 and the second elastic sheet 3 have corresponding through holes in their middle portions, and a clamping locking member 8 passes through the through holes. The clamping locking member 8 drives the first elastic sheet 2 and the second elastic sheet 3 to move closer to each other, so that the distance between the first elastic sheet 2 and the second elastic sheet 3 gradually decreases from bottom to top. Specifically, the distance at the bottom is determined by the width of the mounting protrusion 7, the middle portion is narrowed by the clamping locking member 8, and the top free end is further narrowed under the action of elastic deformation.

[0025] The clamping gap 4 at the top of the first elastic sheet 2 and the second elastic sheet 3 is less than the sum of the thicknesses of the two fabric edges. When the edge enters the clamping gap 4, the first elastic sheet 2 and the second elastic sheet 3 are stretched open and elastically deformed, relying on their own elastic deformation to clamp the edge.

[0026] The fabric guide also includes a fabric guide rod 9. The fabric guide rod 9 is vertically arranged, and the fabric guide base 1 is fixed to the upper end of the fabric guide rod 9. The fabric guide rod 9 is connected to a drive device that drives the fabric guide to move vertically. The drive device can be a cylinder or the like. The drive device drives the fabric guide to move between the upper and lower material positions, facilitating loading and unloading by the operator.

[0027] Example 2 Sewing machine for making curved pockets Comparison Appendix Figure 2This embodiment provides a sewing machine equipped with the aforementioned fabric guide. The sewing machine is mounted on its side, that is, rotated 90 degrees relative to a conventional sewing machine, and includes a sewing head 10 and a base 11. A vertical sewing operation gap is formed between the sewing head 10 and the base 11. The fabric guide is disposed between the sewing head 10 and the base 11, and the clamping gap 4 of the fabric guide clamps the overlock edges of two pieces of fabric, keeping the overlock edges vertically centered.

[0028] The presser foot 12 on the machine head 10 moves horizontally from one side of the machine head 10 to the side of the machine base 11, pressing the fabric guided by the fabric guide onto the feed dog 13 of the machine base 11. The sewing needle 14 on the machine head 10 reciprocates in the horizontal direction. The sewing needle 14 is located outside the fabric guide and sews the fabric outside the fabric guide.

[0029] Preferably, the sewing machine further includes a fabric feeding mechanism. The fabric feeding mechanism is located on the side of the fabric guide away from the sewing needle 14, and is used to assist in pulling the fabric to move, ensuring that the fabric is fed smoothly and steadily during the sewing process.

[0030] Its workflow is as follows: The drive unit moves the fabric guide to the loading position. The operator places two pieces of fabric with overlocked edges onto the fabric guide clamp, so that the overlocked edges of the two pieces of fabric enter the clamping gap 4 from the top of the first elastic plate 2 and the second elastic plate 3. The first elastic plate 2 and the second elastic plate 3 generate clamping force on the overlocked edges by their own elastic deformation, clamping the overlocked edges in the clamping gap 4 and keeping the overlocked edges in a vertical state.

[0031] The drive unit moves the fabric guide to the sewing position, which is the sewing operation gap between the machine head 10 and the machine base 11. At this time, the fabric guide is located between the machine head 10 and the machine base 11, the overlock is kept vertical and centered, and the fabric extends out flat from both sides of the fabric guide.

[0032] The presser foot 12 moves horizontally from one side of the machine head 10 to the other side of the machine base 11, pressing the fabric outside the guide onto the feed teeth 13 of the machine base 11.

[0033] The sewing needle 14 reciprocates horizontally, sewing the fabric on the outside of the fabric guide. Throughout the sewing process, the first elastic plate 2 and the second elastic plate 3 always hold the overlock edge within the clamping gap 4, keeping the overlock edge vertically centered and preventing it from tilting to either side. When sewing a curved pocket, the fabric travels along the curved guide surface 5, and the sewing needle 14 sews a curved stitch accordingly. The fabric feeding mechanism assists in pulling the fabric, ensuring smooth and stable feeding.

[0034] After sewing is completed, presser foot 12 is released, and the drive device moves the fabric guide to the unloading position. The operator removes the sewn fabric from the fabric guide clamp, completing one work cycle.

[0035] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A fabric guide for sewing curved pockets, characterized in that, Includes a guide base (1), on which a guide clip is provided to guide two pieces of fabric with overlock edges to a sewing machine for sewing. The guide clip consists of a first elastic piece (2) and a second elastic piece (3) arranged opposite to each other. A vertical clamping gap (4) is formed between the first elastic piece (2) and the second elastic piece (3). The clamping gap (4) is adapted to the overlock edges of the two pieces of fabric and makes the overlock edges of the fabric remain vertical during sewing. The front side and top of the guide clip are formed with an arc-shaped guide surface (5). The arc-shaped guide surface (5) is a continuous arc surface extending from the front side to the top surface, used to guide the sewing trajectory of the arc-shaped pocket.

2. A fabric guide for sewing curved pockets according to claim 1, characterized in that, The arc-shaped guide fabric surface (5) is an outwardly convex long arc, and the rear side of the guide fabric clip is formed with an inwardly concave small arc surface (6). The sewing point of the sewing machine is located on the rear side adjacent to the end of the guide fabric clip.

3. A fabric guide for sewing curved pockets according to claim 1, characterized in that, The upper end of the guide cloth base (1) is provided with a mounting protrusion (7), and the bottoms of the first elastic sheet (2) and the second elastic sheet (3) are respectively fixed to the two sides of the mounting protrusion (7) by fasteners.

4. A fabric guide for sewing curved pockets according to claim 3, characterized in that, The first elastic sheet (2) and the second elastic sheet (3) are provided with corresponding through holes in the middle. A clamping locking member (8) is inserted in the through hole. The clamping locking member (8) drives the first elastic sheet (2) and the second elastic sheet (3) to move closer to each other, so that the distance between the first elastic sheet (2) and the second elastic sheet (3) gradually decreases from bottom to top.

5. A fabric guide for sewing curved pockets according to claim 4, characterized in that, The clamping gap at the top of the first elastic sheet (2) and the second elastic sheet (3) is less than the sum of the thicknesses of the fabric edge lock. The first elastic sheet (2) and the second elastic sheet (3) clamp the edge lock by their own elastic deformation.

6. A fabric guide for sewing curved pockets according to claim 1, characterized in that, It also includes a guide rod (9), which is arranged vertically, and the guide base (1) is fixed at the upper end of the guide rod (9). The guide rod (9) is connected to a drive device that drives the guide to move vertically.

7. A sewing machine for sewing curved pockets, characterized in that, The sewing machine is equipped with a fabric guide as described in any one of claims 1-6. The sewing machine is side-mounted and includes a head (10) and a base (11). A vertical sewing operation gap is formed between the head (10) and the base (11). The fabric guide is disposed between the head (10) and the base (11). The clamping gap (4) of the fabric guide clamps the overlock edge of two pieces of fabric. The presser foot (12) on the head (10) moves from one side of the head (10) to the side of the base (11) and presses the fabric guided by the fabric guide onto the feed dog (13) of the base (11). The sewing needle (14) on the head (10) reciprocates in the horizontal direction to sew the fabric.

8. A sewing machine for sewing curved pockets according to claim 7, characterized in that, The sewing machine also includes a cloth-pulling mechanism, which is located on the side of the cloth guide away from the sewing needle (14) and assists in pulling the cloth to move.

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