Presser foot device for sewing tubular fabric

Abstract

The presser foot device is arranged adjacent to the sewing fluted disc and comprises a main transmission shaft and a first support, and the first support rotates by a certain angle by taking the main transmission shaft as an axis, so that the first support is provided with at least one working position and a non-working position; a presser foot and a presser foot rod are arranged on the first support, the presser foot is fixed at the front end of the presser foot rod, the presser foot rod is of a lever structure, and the rear end of the presser foot rod is driven by an air cylinder to move up and down; the lower end of the presser foot has a smooth bottom surface; when the first support is located at the working position, the presser foot extends into the sewing tooth disc, and when the first support is located at the non-working position, the presser foot is located outside the sewing tooth disc. When the presser foot mechanism is in a working position, the air cylinder drives the rear end of the presser foot rod to enable the presser foot to press a fabric downwards, so that a downward force is applied to the fabric, the fabric does not move along with a sewing needle when the sewing needle moves upwards, and the action stability is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of knitting machinery, and particularly relates to a presser foot device for sewing tubular fabrics. Background Art

[0002] Tubular fabrics generally refer to socks, and one end of them needs to be sewn after knitting. The most mainstream sewing equipment and methods are recorded in CN102046873A and its related applications. The technical solution is as follows: A sewing or crocheting head specifically for automatically closing a tubular knitted fabric at one of its axial ends, the sewing or crocheting head comprising: a pair of sewing members (2, 3), the pair of sewing members being movable along respective actuation paths and cooperating with each other to form a sewn chain stitch (30); and a cutting member (10), the cutting member (10) being actuable to cut the sewn chain stitch (30), characterized in that the cutting member (10) can cooperate with the sewn chain stitch (30) at a distance from the point where the sewn chain stitch (30) is formed or from the intersection of the paths of the pair of sewing members (2, 3), the distance being between 3 mm and 15 mm, the sewing members comprising: a needle (2) and a crochet hook (3), the needle (2) and the crochet hook (3) being movable along respective intersecting actuation paths to form the sewn chain stitch (30); a support hook (6), the support hook (6) being arranged to support the sewn chain stitch (30) being formed and being arranged near the intersection of the actuation paths and oriented such that the tip (6a) of the support hook is oriented along the travel direction (40) of the object being sewn or crocheted, the cutting member (10) being able to cooperate with the sewn chain stitch (30) near the tip (6a) of the support hook (6) of the sewn chain stitch (30).

[0003] The needle (2) and the crochet hook (3) constituting the above-mentioned sewing members, and the support hook (6) are generally commonly referred to as the large needle, the small needle, and the steel strip needle in China. Before starting the sewing operation, the sock has been hooked on the sewing teeth of the sewing tooth disc, and the sewing tooth disc is folded in half along its diameter into a semi-circle of 180 0 degrees, so that there are two coils to be sewn on one sewing tooth. Then the large needle and the small needle each carry a sewing thread, and a stitch is formed at the intersection of their trajectories. The folded sewing tooth disc rotates forward to cooperate with the formed stitch, so that the stitch stitches the two coils on the sewing teeth together. During the gap between two sewing operations, it depends on the steel strip needle to support the stitch so that it will not fall apart.

[0004] In the above-mentioned prior art, the movement directions of the large needle and the small needle are neither parallel nor perpendicular to the sewing tooth disc, and there will be no conflict in terms of force. In another solution, if the sewing needle moves parallel to the sewing tooth, it may drive the coil to be sewn during the operation, affecting the stability of the operation. Summary of the Invention

[0005] The purpose of the present utility model is to provide a presser foot device for sewing tubular fabrics, so as not to affect the sewing when the sewing needle and the serrated needle are parallel.

[0006] The present utility model adopts the following technical solution: A presser foot device for sewing tubular fabrics, which is arranged adjacent to the serrated disc, and is characterized in that: it includes a main transmission shaft and a first support. The first support rotates at a certain angle around the main transmission shaft, so as to have at least one working position and one non-working position; a presser foot and a presser foot rod are provided on the first support. The presser foot is fixed at the front end of the presser foot rod. The presser foot rod is a lever structure, and its rear end is driven by a cylinder to move up and down; the lower end of the presser foot has a smooth bottom surface; when the first support is in the working position, the presser foot extends into the serrated disc, and when the first support is in the non-working position, the presser foot is outside the serrated disc.

[0007] When the first support of the present utility model is in the non-working position, it is ineffective; when the first support is in the working position, the cylinder drives the rear end of the presser foot rod to make the presser foot press down on the fabric, thereby giving the fabric a downward force. In this way, when the sewing needle moves upward, the fabric will not move with it, ensuring the stability of the action. Description of the Drawings

[0008] Figure 1 is the structural schematic diagram of this embodiment.

[0009] Figure 2 is the schematic diagram of the sewing needle and the driving mechanism in this embodiment.

[0010] Figure 3 is Figure 2 the exploded schematic diagram of

[0011] Figure 4 is the schematic diagram of the yarn guide and the presser foot in the embodiment.

[0012] Figure 5 is Figure 4 the exploded schematic diagram of

[0013] The reference signs in the drawings are as follows: 1 - serrated disc; 10 - serrated needle; 2 - main transmission shaft; 20 - main gear; 3 - first support; 31 - first transverse transmission shaft; 311 - bevel gear; 312 - first transverse transmission shaft drive gear; 32 - first longitudinal rod; 33 - second transverse rod; 331 - second transverse rod end sleeve; 34 - eccentric connecting rod; 35 - sewing needle rod limit seat; 38 - first support drive cylinder; 39 - first support return member; 4 - second support; 41 - upper part of the second support; 42 - middle part of the second support; 43 - lower part of the second support; 5 - sewing needle rod; 51 - sewing needle; 52 - second limiting member; 53 - universal wheel; 6 - yarn nozzle rod; 61 - yarn nozzle; 62 - yarn nozzle rod drive gear; 63 - yarn nozzle rod driven gear; 64 - yarn nozzle rod support; 65 - yarn nozzle rod support member; 66 - yarn nozzle rod drive wheel; 67 - tail of the yarn nozzle rod; 7 - presser foot rod; 71 - presser foot; 72 - presser foot rod drive cylinder; 8 - scissor device.

[0014] The reference signs appearing in the background art section are direct references to the literature and are not related to the drawings of this specification. Detailed implementation mode

[0015] See Figures 1 to 3 This embodiment includes a serrated disc 1, on which serrated needles 10 are arranged; in Figure 1 the state shown, the annular serrated disc has been folded into a semi-annular shape of 180 0 degrees, and two loops of the socks have been hooked on each serrated needle. At this time, the upper semi-ring is irrelevant to the purpose of the invention, so only the lower semi-ring is shown in the figure. During the sewing process, the serrated disc 1 rotates counterclockwise.

[0016] The main transmission shaft 2 and all the components provided thereon are arranged in the adjacent area of the serrated disc. As can be seen in the figure, the first support 3 is an important platform, and a large number of components are directly or indirectly provided on the first support 3. The first support 3 itself is sleeved on the main transmission shaft 2 and rotates at a certain angle around the main transmission shaft 2 under the combined action of the first support drive cylinder 38 and the first support return member 39. The first support drive cylinder has a number of set piston strokes to control the distance of pushing the first support, and the first support return member has elasticity to reversely push the first support when the piston retracts. Thus, the first support 3 has three set positions, namely the first working position, the second working position and the non-working position. In the non-working position, the first support 3 is relatively far away from the serrated disc 1. From a top view, at this time, the presser foot 71 is outside the serrated disc 1, and the sewing needle 51 is separated from the serrated needle 10; in the first working position and the second working position, the first support 3 is relatively close to the serrated disc 1. From a top view, at this time, the presser foot 71 is inside the serrated disc 1. Among them, in the first working position, the sewing needle 51 coincides with the longitudinal groove of the serrated needle 10, and in the second working position, the sewing needle 51 is separated from the serrated needle 10.

[0017] The first support is provided with a first longitudinal rod 32. The shape of the second support 4 is as Figure 3 shown, having an upper part 41, a middle part 42 and a lower part 43. There are two connection relationships between the first support 3 and the second support 4, namely the first transverse transmission shaft 31 and the second transverse rod 33. Among them, there is also an eccentric connecting rod 34 between the first transverse transmission shaft 31 and the second support 4; one end of the first transverse transmission shaft 31 is a bevel gear 311, which meshes with the first transverse transmission shaft driving gear 312 sleeved on the main transmission shaft 2, and the other end is rotationally matched with the eccentric connecting rod 34. The upper part 41 of the second support 4 is also rotationally matched with the eccentric connecting rod 34, that is, the upper part 41 of the second support is rotatably connected to the first transverse transmission shaft 31 non-coaxially and is driven by it; one end of the second transverse rod 33 is rotationally connected to the middle part 42 of the second support 4, and the end sleeve 331 at the other end is sleeved on the first longitudinal rod 32 of the first support, and the two are slidably matched.

[0018] Through the above connection relationship, when the first transverse transmission shaft driving gear 312 rotates, the first transverse transmission shaft 31 is driven to rotate through the bevel gear 311. Due to the action of the eccentric connecting rod 34, the upper part 41 of the second support makes a circular motion on the vertical plane; at the same time, because of the existence of the second transverse rod 33, the middle part 42 of the second support can only move up and down; under the combined action of these two motion modes, the motion trajectory of the lower part 43 of the second support is a trajectory similar to an ellipse.

[0019] The lower part 43 of the second support has a concave arc surface, which is a semi-cylindrical shape in this embodiment, and of course it can also be a bowl shape or a similar shape.

[0020] A suture needle rod limiting seat 35 is also fixedly installed on the first support 3. The suture needle rod 5 passes through the longitudinal through hole of the suture needle rod limiting seat 35 and moves up and down therein; a suture needle 51 is fixedly installed at the upper end of the suture needle rod 5. The suture needle 51 has a sharp needle tip, and a hook groove with an opening direction opposite to the needle tip is provided at the neck to facilitate hooking the suture when moving downward; a second limiting member 52 is fixed to the lower part of the suture needle rod 5, and one end of the second limiting member 52 is rotationally connected to the middle part 42 of the second support; the lower end of the suture needle rod 5 is connected to a universal wheel 53, which is matched with the concave arc surface of the lower part 43 of the second support.

[0021] Through the above connection relationship, when the middle part 42 of the second support moves up and down, the suture needle rod 5 is also driven to move up and down through the second limiting member 52; at the same time, the matching relationship between the lower part 43 of the second support and the universal wheel 53 enables the suture needle rod 5 to rotate around its own axis, and as the swinging direction of the lower part 43 of the second support changes, the rotation of the suture needle rod 5 is reciprocating.

[0022] See Figure 4 , Figure 5This embodiment further includes a yarn nozzle rod 6 and a yarn nozzle 61. A yarn nozzle rod support 64 is fixed on the first support 3. The yarn nozzle rod support member 65 is cylindrical, disposed within the yarn nozzle rod support 64, and rotatably engaged therewith; the yarn nozzle rod 6 passes through the radial through-hole of the yarn nozzle rod support member and is slidably engaged therewith; the head of the yarn nozzle rod 6 is the yarn nozzle 61. A yarn nozzle rod driving gear 62 is provided on the main transmission shaft 2, meshed with a yarn nozzle rod driven gear 63, and the yarn nozzle rod driven gear 63 is connected to a yarn nozzle rod driving wheel 66; the tail 67 of the yarn nozzle rod is eccentrically connected to the yarn nozzle rod driving wheel 66.

[0023] With the above connection relationship, when the yarn nozzle rod driving gear 62 drives the yarn nozzle rod driving wheel 66 to rotate, the tail 67 of the yarn nozzle rod will perform a circular motion on the horizontal plane, and at this time the yarn nozzle 61 also performs a circular motion.

[0024] This embodiment further includes a presser foot rod 7 and a presser foot 71. The presser foot 71 has a smooth bottom surface. The presser foot rod is indirectly connected to the first support, with the front end fixing the presser foot rod 71 and the rear end being pushed by a presser foot rod driving cylinder 72 and being provided with a reset mechanism. When the presser foot rod driving cylinder 72 pushes upward, the presser foot 71 is pushed downward to press on the stitch disc 1.

[0025] This embodiment also includes a scissor device 8. The scissor device is a prior art and will not be elaborated here.

[0026] This embodiment works as follows:

[0027] Two sock coils to be sewn are hooked on the sewing teeth 10 of the stitch disc 1. In the Figure 1 shown direction, the stitch disc 1 rotates counterclockwise, with each advancement of one sewing tooth as one beat; the first support driving cylinder 38 and the first support reset member 39 cooperate to push the first support 3 to the working position. At this time, the presser foot 71 extends into the projection area of the stitch disc 1, and the presser foot rod driving cylinder 72 pushes upward, causing the presser foot 71 to press downward on the sock to be sewn, preventing the sock coil from detaching from the sewing tooth due to an upward force in the subsequent steps.

[0028] The main transmission shaft 2 rotates. Through the cooperation relationship between the first transverse transmission shaft driving gear 312 and the bevel gear 311, the first transverse transmission shaft 31 is driven to rotate, causing the eccentric connecting rod 34 to rotate about the first transverse transmission shaft 31. In cooperation with the connection relationship of the second transverse rod 33 and the first longitudinal rod 32, the second support 4 moves up and down, and at the same time, the lower part 43 of the second support generates a motion similar to an ellipse. The sewing needle rod 5 moves up and down along the sewing needle rod limit seat 35 under the drive of the second limiting member 52; at the same time, under the cooperation of the universal wheel 53 and the arcuate concave surface of the lower part 43 of the second support, it rotates reciprocally about its own axis.

[0029] When the first support 3 is in the first working position, the suture needle bar 5 performs the above-mentioned movement. At this time, the suture needle 51 passes through the longitudinal groove of the suture tooth needle 10, that is, the suture needle passes through the coil hooked on the suture tooth needle, hooks the suture thread, and then passes through the coil hooked on the suture tooth needle again; when the first support 3 is in the second working position, the suture needle bar 5 performs the above-mentioned movement again. At this time, the suture needle 51 is separated from the suture tooth needle 10, the suture needle passes outside the coil hooked on the suture tooth needle, hooks the suture thread, and then returns from outside the coil hooked on the suture tooth needle.

[0030] The suture thread extends from the yarn guide 61, and the other end is itself hooked on the hook groove of the suture needle. Through the reciprocating movement inside and outside the coil, the two coils on the suture tooth needle are sutured together; as the suture tooth disc rotates, a pair of coils are sutured in each beat, thus forming a stitch and completely suturing the sock.

[0031] After completing the suturing of one sock, the scissors device cuts the excess suture thread. Therefore, when starting to suture the next sock, one end of the suture thread is at the yarn guide, and the other end is at the scissors device; at this time, it is necessary to let the suture needle move up and down twice in the second working position to ensure that the suture thread is hooked and the first pair of coils are sutured.

[0032] The above process is continuous. Although the rotation of the suture tooth disc can be divided into several beats, the coils hooked on it are always in a moving state due to inertia; therefore, it is necessary to prevent the suture needle from hooking the coil during movement. For this reason, this patent designs to let the suture needle rotate around its own axis. In this way, when the suture needle moves downward, it is also rotating, and the rotation direction is the same as the advancing direction of the suture tooth disc, thus avoiding the possibility of the hook groove of the suture needle hooking the coil.

[0033] While driving the first horizontal transmission shaft 31, the main transmission shaft 2 also drives the yarn guide rod 6 through the yarn guide rod driving gear 62, and then makes the yarn guide 61 perform a circular motion on the horizontal plane. The motion projections of the suture needle in the first working position and the second working position both fall on the trajectory of this circular motion, so as to ensure that the motion trajectory of the suture needle intersects with the suture thread and can hook the suture thread for sewing operations.

Claims

1. A presser foot device for sewing tubular fabrics, arranged adjacent to a sewing toothed disc, characterized in that: It includes a main transmission shaft and a first support, the first support rotates at a certain angle with the main transmission shaft as the axis, so as to have at least one working position and one non-working position; the first support is provided with a presser foot and a presser foot rod, the presser foot is fixed at the front end of the presser foot rod, the presser foot rod is a lever structure, and its rear end is driven by a cylinder to move up and down; the lower end of the presser foot has a smooth bottom surface; when the first support is in the working position, the presser foot extends into the sewing tooth disk, and when the first support is in the non-working position, the presser foot is outside the sewing tooth disk.

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