Sewing machine with automatic trimming function

Abstract

The invention discloses a sewing machine with an automatic edge cutting function, relates to the technical field of sewing machines, and solves the problem that uniform product quality cannot be ensured due to the fact that sewing and edge cutting on cloth cannot be performed simultaneously. The sewing machine comprises a sewing machine body, a machine table and an upper shaft which rotates to drive sewing needles to move up and down, and further comprises a needle head assembly and a needle head assembly, a blade; a cutter; the blade is in transmission connection with the upper shaft through the transmission assembly, and the upper shaft can drive the blade to rotate through the transmission assembly. The sewing machine can sew two sewing lines at the position, close to the edge, of the cloth, so that the flanging amplitude of the edge of the cloth is smaller, meanwhile, rough selvedge, flanging or prying edge of the edge of the cloth are cut off while sewing is conducted, sewing and edge cutting are conducted at the same time, reworking and secondary cutting are not needed, the production efficiency is greatly improved, and the production cost is reduced. And meanwhile, the cutting precision is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of sewing machines, and particularly to a sewing machine with an automatic edge-cutting function. Background Art

[0002] A high-head sewing machine is a sewing device specially designed for sewing materials such as thick materials and genuine leather. Its characteristics include a high-head design and durability. High-head sewing machines usually have a relatively wide needle pitch adjustment range, are suitable for sewing materials of various thicknesses, and have a strong structure that can withstand large pressures and frictions.

[0003] Some fabrics are composite fabrics composed of multiple layers. A sewing line needs to be sewn at the edge part close to the composite fabric for subsequent edge wrapping. During the sewing process of a high-head sewing machine, the position where the single sewing line on the fabric is under great stress. Therefore, it is easy to cause the edge part of the fabric to delaminate and no longer be tightly pressed together, resulting in the situation of edge turning and edge prying. This is not conducive to the subsequent edge wrapping of the fabric edge. The conventional method is to use a cutting machine to cut off the excess turned or pried edge part along the edge of the sewn fabric after the sewing line on the fabric is sewn, for subsequent edge wrapping. However, this will add an extra process, affecting production efficiency. At the same time, the distance from the sewing line to the edge on each piece of fabric cannot be guaranteed to be consistent, affecting product quality. Summary of the Invention

[0004] The purpose of the present invention is to solve the above problems and design a sewing machine with an automatic edge-cutting function, which solves the problem that the quality of products cannot be guaranteed to be unified because sewing and edge-cutting on the fabric cannot be carried out simultaneously.

[0005] To achieve the above purpose, the technical solution of the present invention is as follows: A sewing machine with an automatic edge-cutting function, the sewing machine includes a sewing machine body, a machine table, and an upper shaft that rotates to drive the sewing needle to move up and down, and further includes: A needle head assembly, the needle head assembly is installed on the sewing machine body and is in transmission connection with the upper shaft. The needle head assembly has two sewing needles that form two sewing lines on the fabric; A blade for cutting the excess frayed or pried edge outside the sewing line on the fabric; A cutting knife, the cutting knife is located below the blade and is configured to be misaligned with the blade. The cutting knife is inclined, and the cutting edge of the cutting knife faces the side where the fabric is located; A transmission assembly, the blade is in transmission connection with the upper shaft through the transmission assembly, and the upper shaft can drive the blade to rotate through the transmission assembly.

[0006] Further, the transmission assembly includes a first transmission assembly and a second transmission assembly. The upper shaft is drivingly connected to the first transmission assembly through a belt. The first transmission assembly is drivingly connected to the second transmission assembly through a belt. The blade is mounted on the second transmission assembly.

[0007] Further, the first transmission assembly includes a first fixing plate, a first transmission shaft, two synchronous pulleys respectively mounted at both ends of the first transmission shaft, and two bearing seats fixedly mounted on the first fixing plate. The first transmission shaft is rotatably connected to the two bearing seats through bearings respectively. The upper shaft is drivingly connected to the synchronous pulley through a belt.

[0008] Further, a hinge is provided on one side of the first fixing plate away from the first transmission shaft. The first fixing plate is hinged to the machine table through the hinge. At least one support adjustment mechanism is provided on the first fixing plate. The support adjustment mechanism supports between the sewing machine body and the first fixing plate.

[0009] Further, the support adjustment mechanism includes a fixing block and a support member. The fixing block is fixed on the first fixing plate. One end of the support member is hinged to the fixing block, and the other end is telescopically connected to the sewing machine body.

[0010] Further, a waist-shaped hole is provided on the support member. The waist-shaped hole extends along the length direction of the support member. A fastening bolt is threadedly connected to the side wall of the sewing machine body. The fastening bolt passes through the waist-shaped hole to fix the support member on the outer wall of the sewing machine body. Further, the second transmission assembly includes a second fixing plate, a second transmission shaft, a synchronous pulley fixed at one end of the second transmission shaft, and two bearing seats fixed on the second fixing plate. The second transmission shaft is respectively rotatably connected to the two bearing seats. The first transmission assembly is drivingly connected to the synchronous pulley on the second transmission shaft through a belt. The blade is detachably mounted at one end of the second transmission shaft away from the synchronous pulley.

[0011] Further, a needle plate is provided on the machine table. The needle plate has a first avoidance hole for the sewing needle to pass through and a second avoidance hole for avoiding the blade. The cutter is located in the second avoidance hole and is inclined.

[0012] Further, the side of the blade's cutting edge facing the fabric has a plurality of protrusions.

[0013] Further, a first presser foot assembly and a second presser foot assembly are provided on the sewing machine body. The first presser foot assembly is located on one side of the second presser foot assembly. The needle head assembly is located on one side of the second presser foot. The second presser foot assembly has a round hole for the sewing needle to pass through up and down.

[0014] Compared with the prior art, its beneficial effects are as follows: The sewing machine of the present invention drives the needle assembly to move up and down by rotating the upper shaft. The needle assembly has two sewing needles, so two sewing lines can be sewn at the position near the edge of the fabric, so as to reduce the flanging or prying of the fabric edge. During the rotation of the upper shaft on the sewing machine, power is transmitted to the blade through the transmission assembly to drive the blade to rotate. During the rotation of the blade, it will cooperate with the cutting knife below to cut off the flanging or prying of the fabric edge for subsequent edge wrapping.

[0015] The technical solution of the present invention can sew two sewing lines at the position near the edge of the fabric at the same time, so that the flanging amplitude of the fabric edge is smaller. At the same time, while sewing, the frayed edges, flanging or prying of the fabric edge are cut off, and sewing and edge cutting are carried out at the same time. In this way, there is no need for rework and secondary cutting, which greatly improves the production efficiency, and at the same time, the cutting accuracy will be higher. The distance from the edge of each piece of fabric to the sewing line is the same, with higher uniformity and better quality, which is beneficial for subsequent unified edge wrapping. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of the sewing machine in the present invention; Figure 2 is a schematic diagram of the structure of the sewing machine from another perspective in the present invention; Figure 3 is a schematic diagram of the structure of the sewing machine body in the present invention; Figure 4 is a schematic diagram of the structure of the first transmission assembly and the support adjustment mechanism in the sewing machine; Figure 5 is a schematic diagram of the first transmission assembly in the sewing machine; Figure 6 is a schematic diagram of the second transmission assembly in the sewing machine; Figure 7 is a schematic diagram of the structure of the blade in the sewing machine; Figure 8 is a schematic diagram of the structure of the needle plate in the sewing machine.

[0017] In the figure, 1, sewing machine body; 2, upper shaft; 21, handwheel; 3, machine table; 4, needle assembly; 41, sewing needle; 5, blade; 501, protrusion; 6, first transmission assembly; 61, first fixing plate; 62, first transmission shaft; 7, second transmission assembly; 71, second fixing plate; 72, second transmission shaft; 8, synchronous pulley; 9, bearing seat; 10, hinge; 11, support adjustment mechanism; 111, fixing block; 112, support member; 1121, waist-shaped hole; 12, needle plate; 121, first avoidance hole; 122, second avoidance hole; 13, first presser foot assembly; 14, second presser foot assembly; 15, cutting knife. Detailed implementation mode

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0019] As Figures 1 - 3 shown, an embodiment of the present invention provides a sewing machine with an automatic edge-cutting function. This sewing machine is a high-head sewing machine and can sew thick fabrics, especially composite fabrics with multiple layers.

[0020] This sewing machine mainly includes components such as a sewing machine body 1, a machine table 3, an upper shaft 2, a cutting knife 15, a needle assembly 4, a first transmission assembly 6, a second transmission assembly 7, a first presser foot assembly 13, and a second presser foot assembly 14.

[0021] Specifically, the sewing machine body 1 is fixedly installed on the machine table 3. The needle assembly 4, the first presser foot assembly 13, and the second presser foot assembly 14 are all installed on the head of the sewing machine body 1. The first presser foot assembly 13, the second presser foot assembly 14, and the needle assembly 4 move up and down.

[0022] The first presser foot assembly 13 mainly includes a first presser foot, and the second presser foot assembly 14 mainly includes a second presser foot. The shape of the second presser foot is similar to an "L" shape and is used to press the sewing part of the fabric so that the fabric will not warp during sewing. The first presser foot extends to one side of the second presser foot and is used to press the side of the sewing part on the fabric away from the edge.

[0023] Referring to Figure 3 , in this embodiment, the needle assembly 4 mainly includes two sewing needles 41. The two sewing needles 41 are spaced a certain distance apart and move up and down together simultaneously. There are two round holes penetrating up and down on the second presser foot, so that the sewing needles 41 can pass through the second presser foot during the up and down movement, contact the fabric, and sew the thread on the fabric.

[0024] There is a thread-hooking component (not shown in the figure) matching with the machine table 3 inside the machine table 3. The two sewing needles 41 cooperate with the thread-hooking component and sew two sewing lines at positions close to the edge of the fabric. Since the two sewing lines are spaced a certain distance apart and one of them is close to the edge of the fabric, the edge of the fabric can be sewn more tightly in this way, reducing the degree of prying or turning over of each layer at the edge of the fabric, which is beneficial for later edge binding.

[0025] Continue to refer to Figure 3The upper shaft 2 is mounted on the sewing machine body 1, and the upper shaft 2 controls the needle assembly 4, the first presser foot assembly 13 and the second presser foot assembly 14 to move up and down by rotating. A motor is installed in the sewing machine body 1 to control the rotation of the upper shaft 2.

[0026] One end of the upper shaft 2 extends to the outside of the sewing machine body 1, and a handwheel 21 is installed at its end. By manually rotating the handwheel 21, the upper shaft 2 can be controlled to rotate so as to lift the needle assembly 4, the first presser foot assembly 13 and the second presser foot assembly 14 upward to remove the fabric.

[0027] like Figure 4 、 Figure 5 As shown, the first transmission assembly 6 primarily consists of a first fixed plate 61, a bearing seat 9, a first transmission shaft 62, and a synchronous pulley 8. The first fixed plate 61 is hingedly connected to the machine platform 3 via a hinge 10. Two bearing seats 9 are provided, each mounted on the side of the first fixed plate 61 away from the hinge 10. The first transmission shaft 62 is horizontally positioned and rotationally connected to the two bearing seats 9. A synchronous pulley 8 is mounted at each end of the first transmission shaft 62. Utilizing the existing groove on the handwheel 21, the handwheel 21 is connected to the synchronous pulley 8 at one end of the first transmission shaft 62 via a belt, driving the first transmission shaft 62 as the upper shaft 2 rotates.

[0028] like Figure 6 As shown, the second transmission assembly 7 is mainly composed of a second fixed plate 71, a bearing seat 9, a second transmission shaft 72 and a synchronous wheel 8, wherein the second fixed plate 71 is fixedly mounted on the machine table 3 by screws, so the second transmission assembly 7 is removable, and two bearing seats 9 are provided, both of which are mounted and fixed on the second fixed plate 71. The second transmission shaft 72 is placed horizontally, and the second transmission shaft 72 is rotatably connected to the two bearing seats 9 through bearings. The synchronous wheel 8 is installed on the second transmission shaft 72 at one end close to the first transmission shaft 62, and the synchronous wheel 8 on the second transmission shaft 72 is connected to the synchronous wheel 8 on the first transmission shaft 62 through a belt. Therefore, when the first transmission shaft 62 rotates, the second transmission shaft 72 can be driven to rotate.

[0029] The blade 5 is mounted on the end of the second transmission shaft 72 away from the synchronous wheel 8. Rotation of the second transmission shaft 72 drives the blade 5 to rotate, thereby cutting the fabric. The blade 5 utilizes the power of the sewing machine itself, which is transmitted through the transmission assembly to drive the blade 5 to rotate. Therefore, modifications to the sewing machine are minimal and cost-effective.

[0030] like Figure 1 As shown, in order to prevent the first fixing plate 61 from turning over, two support adjustment mechanisms 11 are further provided on the first fixing plate 61 , which are respectively located near the two ends of the first fixing plate 61 .

[0031] refer toFigure 4 The support adjusting mechanism 11 is mainly composed of a fixed block 111 and a support member 112. The fixed block 111 is fixed on the first fixed plate 61. One end of the support member 112 is hinged to the fixed block 111, and the other end is adjustably connected to the sewing machine body 1.

[0032] A waist-shaped hole 1121 is provided on the support member 112. The waist-shaped hole 1121 extends along the length direction of the support member 112. At the same time, a threaded hole is provided on each side of the sewing machine body 1, and a fastening bolt is threadedly connected in the threaded hole. By flipping the first fixed plate 61, the tension of the belt between the handwheel 21 and the synchronous pulley 8 can be adjusted. After the tension is adjusted, the support members 112 of the two support adjusting mechanisms 11 are respectively located on both sides of the sewing machine body 1. Then, the fastening bolt is passed through the waist-shaped hole 1121 and threadedly connected to the threaded hole on the sewing machine body 1. Then, the fastening bolt is tightened, so that the support member 112 is fixed and cannot move. The support member 112 can support the first fixed plate 61 to prevent the first fixed plate 61 from flipping randomly.

[0033] When adjusting the tension of the belt, loosen the fastening bolt, and then flip the first fixed plate 61. At this time, one end of the support member 112 will also rotate relative to the first fixed plate 61, and the other end can telescopically move relative to the sewing machine body 1 through the waist-shaped hole 1121. After adjustment, tighten the fastening bolt again.

[0034] As Figure 7 shown, in this embodiment, a plurality of protrusions 501 are evenly distributed along the circumferential direction at the edge part of the blade 5, so that the shape of the blade 5 is similar to a polygon, and in this embodiment, the shape of the blade 5 is similar to a hexagon. The advantage of this design is that when the blade 5 rotates, the cutting angle between the part of the blade 5 with the protrusion 501 and the fabric is smaller, and the cutting will be sharper.

[0035] The position of the blade 5 is at the rear side close to the sewing needle 41. After the sewing thread at a certain part of the fabric is sewn, the blade 5 will cut off the turned edge or pried edge at the edge of the sewn part.

[0036] As Figure 2 、 Figure 8 shown, on the machine table 3, a needle plate 12 is installed below the sewing needle 41. At the same time, there is a groove on the machine table 3 for installing the needle plate 12. The needle plate 12 is fixedly installed in the groove by screws.

[0037] The needle plate 12 has two avoidance holes, namely a first avoidance hole 121 and a second avoidance hole 122, which correspond to the positions of the sewing needle 41 and the blade 5 respectively. In order to facilitate processing in this embodiment, the first avoidance hole 121 and the second avoidance hole 122 are connected.

[0038] During the up-and-down movement, the sewing needle 41 passes through the first avoidance hole 121, while the cutter 15 is located in the second avoidance hole 122 and is detachably connected to the needle plate 12. The cutting edge of the cutter 15 faces the side where the fabric is located. The cutter 15 is inclined and is horizontally offset from the blade 5. In this way, the blade 5 and the cutter 15 cooperate with each other, and their function is similar to that of scissors. When the fabric passes through the cutter 15 and the blade 5, the fabric will be subjected to the shearing force of the cutter 15 and the blade 5, making it easier to cut off the frayed, turned or pried parts at the edge of the fabric.

[0039] The above technical solutions only reflect the preferred technical solutions of the technical solutions of the present invention. Some changes that those skilled in the art may make to some parts thereof all reflect the principles of the present invention and fall within the protection scope of the present invention.

Claims

1. A sewing machine with an automatic edge-cutting function, the sewing machine comprising a sewing machine body (1), a machine table (3), and an upper shaft (2) that rotates to drive a sewing needle (41) to move up and down, characterized in that, It further includes: a needle assembly (4), the needle assembly (4) is mounted on the sewing machine body (1) and is in transmission connection with the upper shaft (2), and the needle assembly (4) has two sewing needles (41) that form two stitching lines on the fabric; a blade (5) for cutting off the excess frayed edges or turned edges of the fabric outside the stitching line; a cutter (15), the cutter (15) is located below the blade (5) and is configured to be misaligned with the blade (5), the cutter (15) is inclined, and the cutting edge of the cutter (15) faces the side where the fabric is located; a transmission assembly, the blade (5) is in transmission connection with the upper shaft (2) through the transmission assembly, and the upper shaft (2) can drive the blade (5) to rotate through the transmission assembly.

2. The sewing machine with an automatic edge-cutting function according to claim 1, wherein, The transmission assembly includes a first transmission assembly (6) and a second transmission assembly (7), the upper shaft (2) is in transmission connection with the first transmission assembly (6) through a belt, the first transmission assembly (6) is in transmission connection with the second transmission assembly (7) through a belt, and the blade (5) is mounted on the second transmission assembly (7).

3. The sewing machine with an automatic edge-cutting function according to claim 2, wherein, The first transmission assembly (6) includes a first fixing plate (61), a first transmission shaft (62), two synchronous pulleys (8) respectively mounted at both ends of the first transmission shaft (62), and two bearing seats (9) fixedly mounted on the first fixing plate (61), the first transmission shaft (62) is rotatably connected to the two bearing seats (9) through bearings respectively, and the upper shaft (2) is in transmission connection with the synchronous pulley (8) through a belt.

4. A sewing machine with an automatic edge-cutting function according to claim 3, characterized in that, A hinge (10) is provided on one side of the first fixing plate (61) away from the first transmission shaft (62), the first fixing plate (61) is hinged to the machine table (3) through the hinge (10), and at least one support adjustment mechanism (11) is provided on the first fixing plate (61), and the support adjustment mechanism (11) supports between the sewing machine body (1) and the first fixing plate (61).

5. A sewing machine with an automatic edge trimming function according to claim 4, characterized in that, The support adjustment mechanism (11) includes a fixing block (111) and a support member (112), the fixing block (111) is fixed on the first fixing plate (61), one end of the support member (112) is hinged to the fixing block (111), and the other end is telescopically connected to the sewing machine body (1).

6. The sewing machine with an automatic edge cutting function according to claim 5, characterized in that, A waist-shaped hole (1121) is formed in the support member (112), the waist-shaped hole (1121) extends along the length direction of the support member (112), and a fastening bolt is threadedly connected to the side wall of the sewing machine body (1), and the fastening bolt passes through the waist-shaped hole (1121) to fix the support member (112) on the outer wall of the sewing machine body (1).

7. A sewing machine with an automatic edge-cutting function according to claim 2, characterized in that, The second transmission assembly (7) includes a second fixing plate (71), a second transmission shaft (72), a synchronous pulley (8) fixed to one end of the second transmission shaft (72), and two bearing seats (9) fixed on the second fixing plate (71). The second transmission shaft (72) is rotatably connected to the two bearing seats (9) respectively. The first transmission assembly (6) is in transmission connection with the synchronous pulley (8) on the second transmission shaft (72) through a belt. The blade (5) is detachably mounted on the end of the second transmission shaft (72) away from the synchronous pulley (8).

8. A sewing machine with an automatic edge trimming function according to claim 1, characterized in that, A needle plate (12) is provided on the machine table (3). The needle plate (12) has a first avoidance hole (121) for the sewing needle (41) to pass through and a second avoidance hole (122) for avoiding the blade (5). The cutting knife (15) is located in the second avoidance hole (122) and is inclined.

9. A sewing machine with an automatic edge-cutting function according to claim 1, characterized in that, The side of the cutting edge portion of the blade (5) facing the fabric has a plurality of protrusions (501).

10. A sewing machine with an automatic edge-cutting function according to claim 1, characterized in that, A first presser foot assembly (13) and a second presser foot assembly (14) are provided on the sewing machine body (1). The first presser foot assembly (13) is located on one side of the second presser foot assembly (14). The needle head assembly (4) is located on one side of the second presser foot. The second presser foot assembly (14) has a circular hole for the sewing needle (41) to pass through up and down.

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