TW201932664A - Sewing machine and method for closing open end of tubular knitted articles - Google Patents

Abstract

The present invention is concerned with a sewing machine and sewing method used thereof. The sewing machine is configured to knit and close an open end of a tubular knitted article, comprises a frame, a knitting head and a thread cutter. The knitting head and the thread cutter are disposed rotatablely on the frame, the knitting head having a needle, a needle-shaped hook and a knot making peg, to form thread knots, and the thread cutter is configured to cut the knitting thread, wherein the thread cutter is configured in a fashion that enables its movement relative to the knitting head.

Description

Sewing machine for sewing open end of tubular knitted fabric and knitting method thereof

The present invention relates to a method and a machine for sewing an open edge of a tubular or tubular fabric (for example, a sock), particularly a sewing machine and a knitting method using a pair of knitting needles.

Tubular knitwear, such as socks, are produced using circular knitting machines. During production, the two ends of the tubular knitwear have openings, and one end (toe cover) is moved from the knitting needle of the knitting machine to another station for knitting and sewing. The operation of moving the tubular knitwear to the toe bag stitching station can be performed manually or in an automated manner as described in patent EP2377979.

As described in EP2377979, when the socks knitting cycle on the knitting machine is completed, the stitches in the last-to-knit rank will be received from the knitting needles respectively, and the majority of the stitches in the last-knit rank will be divided into 2 Half of the braided rows (semi-rank), and moving half of the braided rows and the other half of the braided rows overlap each other correspondingly. This stacking operation is performed using a circumferential mechanism that includes a pair of semi-circular elements that can rotate 180 degrees, of which a semi-circular element can swing on the other semi-circular element, while all coils are arranged along one semi-circle and correspondingly formed. Many pairs of stitches. With the operation of the circumferential mechanism, the pair of coil sets is moved to a position ready for sewing to sew one end of the tubular fabric (toe cover).

A knitting mechanism designed to sew a toe sleeve may require one or two knitting needles, a knitting machine with a single knitting needle is used to form a knitting loop, and a knitting machine with two knitting needles is used to form two knitting threads. Knitting loop.

In conventional technology, it is known that the use of a machine with a knitting needle to sock a toe cover of a sock still has defects, such as the risk of the yarn spreading.

A knitting machine with two knitting needles basically includes a needle, a needle-shaped hook, and a peg for knotting.

The knitting needles and crochet needles of the knitting machine are provided with holes at positions close to the edge of the tip to allow a thread to pass through. When the knitting needle penetrates the coil group, move into one side of the coil group and thread it out on the other side, and at the same time, pull up the knitting thread through the coil group. After the knitting needle and the weaving thread pass through the loop group, the knitting thread of the knitting needle will be retained by the crochet. The knitting needles are withdrawn from the last loop that has been threaded in, and at the same time, the knitting thread remaining in the crochet remains in the loop group. Thereby, the coil group is knotted with a double knot.

The above operation is repeated one by one for each pair of coil groups until the toe sleeve suture step is completed. When the toe sleeve is stitched, there are no leftover knitting pairs of stitches on the knitting needle. Therefore, thread knots are placed on the knot making peg. The tip of the suture-forming shank moves outwards and has a conical shape for placing a knitted suture. Thereby, an extra knit stitch is formed. In this position, one end of the extra knitted suture remains in the tubular knitwear (sock) and the other end is in the suture forming handle, so it needs to be cut to release. When the extra knitted stitch is cut and released, part of the extra knitted stitch remains in the sock, while another part of the extra knitted stitch remains in the stitch forming handle. The extra knitted stitch remains in the stitch forming shank portion and is positioned next to the knitting start end of the toe sleeve of the continuation socks. Therefore, a predetermined length of knitted suture can be retained by this method at the beginning and end of the toe cover knitting process for manufacturing socks.

Ideally, the knitted stitches retained at the beginning and end of the toe cover of the sock should have an approximate length, typically between 8 and 10 millimeters (mm). On the other hand, in addition to the knitting stitches remaining at the beginning and end of the toe sleeve knitting process of manufacturing socks, after the last knitting row of the socks, various lengths of yarn segments will be left in the socks.

Conventional technology has many machines for cutting external knitting stitches and methods for the same. As described in patent EP 2300653, a cutter is provided on the head of a sewing machine to cut knitting stitches at a predetermined distance, like a cutter. The distance from the suture forming handle. However, the machine described in patent EP 2300653 cannot cut knitting stitches formed on both ends of a sock after weaving (almost standard length), and after weaving the last knitting row of the sock, it cannot cut the knitting left on the sock. A thread segment (a segment of a knit that belongs to a sock). Therefore, after the last knitting row of the sock is knitted, the snippet of thread left on the sock is likely to have a loose end arbitrarily hanging in all directions.

In order to solve the foregoing deficiency, the present invention provides a sewing machine for sewing an open end of a tubular knitted fabric, comprising a base, a sewing machine head, and a wire cutting device, a sewing machine head is pivotably connected to the base, and a wire cutting device can Pivotally connected to the base, the sewing machine head has a knitting needle, a needle-shaped crochet hook, and a stitch forming handle for forming a knitted stitch, and the thread cutting device is used to cut the knitted stitch, The wire cutting device can move relative to the sewing machine head.

According to the above arrangement, the sewing machine is provided with an air inlet controlled by the wire cutting device.

According to the above arrangement, the driving force for driving the wire cutting device relative to the sewing head is provided by the sewing head itself or by a separate actuator.

According to the above-mentioned setting, the distance between the position where the knitting stitches are formed and the wire cutting device is changed between 3 to 30 millimeters (mm) regardless of the position of the sewing machine head and the wire cutting device. Preferably, the The distance varies between 20 and 30 millimeters (mm).

The present invention also provides a knitting method for sewing the openings of a tubular knitted fabric. Using the sewing machine as described above, the steps include: forming the openings of the tubular knitted fabric into a plurality of pairs of coil groups arranged along a semicircle, and introducing the sewing head of the sewing machine. The weaving thread starts by weaving the paired coil groups to form a knitting stitch; and after completing the knitting operation of all the paired coil groups, the sewing machine head forms an additional knitting stitch, using a movable thread cutting device on the sewing machine Cutting additional knitted seams; wherein the wire cutting device is movable relative to the sewing machine head.

The present invention also provides a sock produced by using the aforementioned knitting method, the sock comprising a knitting stitch at 8 to 10 millimeters (mm) at both ends for a knitting operation.

In this way, in addition to being able to cut extra knitted stitches, the wire cutting device can also be displaced relative to the sewing machine head, thereby adjusting the length of the knitted stitches left on the tubular knitted fabric (socks) after cutting, and The length of the knitting stitches left on the sewing machine head is used as the starting end and the ending end in the manufacturing process of the socks.

The embodiment provided by the present invention is a sewing machine including a base (10); a sewing machine head (20) is rotatably disposed on the base (10) and is pushed by a sewing machine head cam (11) of the base (10); The first motor (12), preferably a stepping motor, is disposed on the base (10). The output end of the first motor (12) is provided with a two-arm crank (12a) and an arm (12b) connected to each other, wherein One end of the arm (12b) is connected to the cam of the sewing machine head (11), so that the first motor (12) can drive the sewing machine head (20) to rotate around the rotation shaft (29). In addition, the moving mechanism of the aforementioned sewing machine head (20) can also be provided using a known linear mechanism.

One end of the cutting tool arm (30) is connected to the base (10), and rotates around the arm shaft (39). In addition, as shown in FIG. 2, the first stopper (13) projects upward from the base (10) to stop the sewing machine head (20) and position the sewing machine head (20) at the knitting position.

The other end (open end) of the cutting tool arm (30) is provided with a wire cutting device capable of moving along a circular trajectory. The wire cutting device includes a fixed tool (31) and a movable tool (32) which can be moved closer to and farther from the fixed tool ( 31). The disc (32b) is arranged on the cutter, whereby the movable cutter (32) can be pressed on the stationary cutter (31).

The second stopper (14) is disposed on the sewing machine head (20) between the sewing machine head (20) and the cutting tool arm (30), and can be used to stop the cutting tool arm (30). In addition, the base (10) is also provided with a spring (15), the two ends of which are respectively connected to the base (10) and the cutting tool arm (30), and when the cutting tool arm (30) is unloaded, it is pushed against the cutting tool arm (30) toward the sewing machine. The head (20) moves. As shown in FIG. 10 (or FIG. 11C), the sewing machine head (20) itself can rotate to a certain degree. However, when the second gear (14) contacts the cutting tool arm (30), the sewing machine head (20) and the cutting tool arm ( 30) Will rotate together. Optionally, the second stopper (14) can be changed to the cutting tool arm (30).

Alternatively, the driving mode of the cutting tool arm (30) and the wire cutting device may be an independent actuator separated from the driving of the sewing machine head (20). To this end, an additional motor element can be connected to the pivot arm shaft (39). However, it should be noted that the movement of the driving wire cutting device may be a linear mechanism or a mechanism that generates a general plane motion, and the wire cutting device is moved along a linear trajectory or on a plane. When the cutting tool arm (30) is driven by an independent actuator, the sewing machine head (20) can also be fixed on the base (10).

One end of the sewing machine head (20) is provided with a knitting needle (1), a needle-shaped crochet (2), and a suture-forming handle (3) is provided adjacent to the needle-shaped crochet (2). Place the formed knitted seams.

The knitting needles (1) and crochet needles (2) used for knitting operations are driven by a second motor (25), preferably a stepper motor. As shown in FIG. 1, the output of the second motor (25) is provided with a first plate (21) and a second plate (22) connected to each other. One end of the first plate (21) is connected to the second motor ( 25). The other end of the first plate (21) is connected to the needle control lever (23) by eccentric rotation. The connection point between the knitting needle control lever (23) and the first plate (21) is also connected to one end of the second plate (22). The position of the second plate (22) near the other end is connected to the crochet control lever (24) by eccentric rotation.

The needle control lever (23) is embedded in the sewing machine head (20) with a swing bearing, and the other end is fixed with the needle (1) to drive it. The crochet control lever (24) is embedded in the sewing machine head with a swing bearing. (20) The body, the other end of which is fixed with a crochet hook (2) to drive its action. In this position, the power source is first transmitted to a gear set (28) having two gears that mesh with each other at 90 degrees, and then to the crochet (2). Therefore, when the second motor (25) completes a cycle, the knitting needle (1) and the crochet needle (2) will move in synchronization.

The cutting tool arm (30) is in the shape of an elongated arm, and includes two arm portions positioned mutually to form an obtuse angle. As described above, the cutting tool arm (30) is rotatably connected to the base (10) through the arm shaft (39).

A support piston (35) is provided at one end of the cutting tool arm (30) near the wire cutting device, and a movable rod (32) is driven by a piston rod (34) to generate an action. The suction pipe (33) is provided on the upper part of the cutting tool arm (30). The suction pipe (33) extends to the rear of the movable cutter (32). When the movable cutter (32) is in the lower position, the air inlet (33a) of the suction pipe (33) is closed. Although the suction pipe (33) always keeps the state of inhaling, no energy is consumed when the air inlet (33a) is closed.

When the knitting operation is advanced to the stage of stitching the opening of the tubular knitted fabric, as shown in FIG. 3, the pair of loop groups (42) are stitched along a semicircle as described in patent EP 2377979. At the same time, the knitting needles (1) and crochet needles (2) used for the knitting operation are positioned perpendicular to the horizontal knitting axis (41) of the pair of loop groups (42), as shown in FIG. At the same time, the cutting tool arm (30) is positioned adjacent to the trajectory of the stitched coil group (42). At this position, the distance between the workstation where the knitting stitches are formed and the position where the knitting stitches will be cut by the wire cutting device is about 30 millimeters (mm).

As shown in FIG. 4, when the knitting needle (1) is set on the sewing machine head (20), and the first pair of coil groups (42) to be knitted are aligned and aligned with each other, the tip of the knitting needle (1) and the thread The weaving thread of the hole (1a) adjacent to the tip passes through the pair of coil groups (42). Before the first loop group (42) of the needle (1) passes through, the crochet (2) grasps the thread passing through the needle (1), and the thread first passes through the hole (2a) at the tip of the crochet (2). ) Is pulled out, the knitting needle (1) penetrates the pair of coil groups (42) and leaves the knitting thread in the pair of coil groups (42). Therefore, the first pair of coil sets (42) are knitted and stitched together. When the first pair of stitches (42) is stitched, the knitted stitches (44b) that have been retained on the stitch forming handle (3) are also located on the first stitch pair (42).

When the first pair of loops (42) is finished weaving, the pair of loops (42) carried by the semicircular element is rotated in a known manner about the weaving axis (41) in direction 43. As a result, the coil group (42) of the second pair is aligned with the knitting needle (1). The knitting operation is repeated in the knitting direction (5) (as shown in Fig. 12) to all the pairs of stitches to form a knitted stitch (42a) to a stitch group (42). Next, the knitting stitches (44b) are fixed to the first pair of stitches (42) and the knives (31, 32) are advanced toward the wire cutting device.

As shown in FIG. 5, the movable cutter (32) is partially moved upward (32 a) away from the fixed cutter (31), and thus the air inlet (33 a) of the suction pipe (33) is opened. The knitted suture (44b) provided in the first coil group (42) is sucked into the air inlet (33a) of the suction pipe (33). Next, the knitted suture (44b) fixed to the first loop group is positioned between the two knives (31, 32).

As shown in FIG. 6, when the movable cutter (32) is moved downward (32 a), the knitting stitches (44 b) are cut, and a length of about 8 to 10 millimeters (mm) is left on the socks. Another segment of the knitted suture (44b) is sucked in by the suction pipe (33).

When the knitting operation of all the pairs of stitches (42) is completed, additional knitting stitches (44) must be formed. Additional knitting stitches (44) are generated at the stitch forming handle (3), the tapered tip (3a) of the stitch forming handle (3) can be moved outward, and the stitch forming handle (3) has a tapered portion for Knit stitching (4) is placed. As a result, when an additional knitted stitch (44) of 30 to 40 millimeters (mm) in length is formed, the sewing machine head (20) rotates along the direction (29a) with the shaft (29) as the axis, and further away from the secondary coil group (42). With this action, the final knitted stitch (44) is positioned between the knives (31, 32), and the knives (31, 32) are opened due to the upward movement of the movable knives (32). When in this position, the tip (3a) of the suture forming handle (3) provided on the sewing machine head (20) and the cutters (31, 32) of the wire cutting device are separated by a distance of about 20 to 30 millimeters (mm).

As shown in Figure 9, when the movable knife (32) is moved downward, the knitted stitching is cut into two sections, of which a section of about 8 to 10 millimeters (mm) is left in the socks, and the length is about 20 to 30 millimeters (mm) Another segment of) remains in the suture forming handle (3).

As shown in FIG. 10, when the toe bag is sewn and the knitting stitches (44a, 44b) are cut, the sewing machine head (20) is pivoted along its axis (29) and is fully rotated about 90 degrees in the direction (29aa). . At the same time, the cutting tool arm (30) will rotate in the direction (39a) with the arm shaft (39) as the axis, and will only partially rotate due to the setting of the second gear (14). The component is removed.

The sewing machine provided in the foregoing embodiment can be used to stitch the opening of a tubular knitted fabric, and the knitting method used is as follows. First, the sewing machine head (20) is located at the knitting position, and the opening of the tubular knitted fabric forms a coil group (42) arranged along a semicircle. The sewing machine head (20) introduces a weaving thread (4) to continue the original knitting thread (44b). Knitting is started to form a knitted seam (42a). Next, the air inlet (33a) of the suction pipe (33) is opened to suck the knitted stitches (44b) to be cut, and the knitting stitches (44b) are cut with the cutters (31, 32), and the knitting stitches are continuously knitted (42a) The stitch sets (42) are connected by stitching until the knitting operation of all stitch sets (42) is completed. Subsequently, the sewing machine head (20) is used to form additional knitted stitches (44), and the sewing machine head (20) is driven to rotate to deviate from the knitting position and approach the cutting tool arm (30), so that the additional knitted stitches (44) are Positioned on the cutter (31, 32), as shown in FIG. 8 and FIG. 11B, and using the cutter (31, 32) to cut the extra knitted suture (44) to divide into two knitted sutures (44a, 44b). Finally, the sewing machine head (20) is driven to fully rotate and the cutting tool arm (30) is partially rotated to keep the cutting tool arm (30) away.

When the opening of another tubular knitted fabric is to be stitched, the steps in the previous paragraph may be repeated. Therefore, the present invention has a wire cutting device provided independently of the sewing machine head. The knitted stitches formed on both ends of the tubular knitted fabric can be cut, and the length of the cut knitted stitches (that is, the distance between the wire cutting device and the stitch forming handle) can be adjusted.

1‧‧‧ knitting needles

1a‧‧‧ Hole in the needle tip

2‧‧‧ crochet

2a‧‧‧Hole in crochet tip

3‧‧‧ suture forming handle

3a‧‧‧ suture forming handle tip

4‧‧‧ weaving thread

5‧‧‧ Knitting direction

10‧‧‧ base

11‧‧‧ cam of sewing machine head

12‧‧‧ the first motor

12a‧‧‧arm crank

12b‧‧‧arm

13‧‧‧First gear

14‧‧‧ second gear

15‧‧‧spring

20‧‧‧Sewing machine head

21‧‧‧The first plate

22‧‧‧Second plate

23‧‧‧ Needle control lever

24‧‧‧ Crochet lever

25‧‧‧Second motor

28‧‧‧Gear Set

29‧‧‧ rotating shaft of sewing machine head

29a‧‧‧ Direction of sewing machine part away from knitting position

29aa‧‧‧The direction of the sewing head completely away from the knitting position

30‧‧‧ cutting tool arm

31‧‧‧ fixed tool

32‧‧‧ movable knife

32a‧‧‧moving tool moving direction

32b‧‧‧platters

33‧‧‧ Suction tube

33a‧‧‧Air inlet

34‧‧‧Piston rod

35‧‧‧Piston

39‧‧‧ arm shaft

39a‧‧‧ Cutting tool arm rotation direction

41‧‧‧ Knitting Shaft

42‧‧‧coil set

42a‧‧‧ Knitting Stitches

43‧‧‧ direction

44‧‧‧ Uncut Knitted Stitches

44a ‧‧‧ tailored knitting stitches retained on socks

44b ‧‧‧ tailored knitting stitches remaining on the stitch forming handle

Figure 1 shows a schematic diagram of a sewing machine

FIG. 2 is a schematic diagram of the sewing machine from another angle.

FIG. 3 illustrates a top view of the sewing machine.

Fig. 4 shows a schematic diagram of the sewing machine, showing an initial step.

Fig. 5 shows a schematic diagram of a sewing machine showing a knitting process in which a portion of a knitted stitch is sucked by an air suction pipe.

FIG. 6 is a schematic diagram of a sewing machine showing a period of knitting operation in which an unnecessary portion of the knitted suture sucked in by the suction pipe is cut.

FIG. 7 shows a schematic diagram of a sewing machine, showing that after the knitting is completed, the sewing machine forms additional knitting stitches.

FIG. 8 shows a schematic diagram of the sewing machine, showing that when the sewing machine head is away from the knitting position to some extent, the extra knitting stitches are caught by the wire cutting device in the open position.

Fig. 9 shows a schematic diagram of a sewing machine, showing that the knitting stitches are cut.

FIG. 10 is a schematic diagram of the sewing machine, showing that after the knitting operation is completed, the sewing machine head is withdrawn from the knitting position and rotated approximately 90 degrees.

FIG. 11A is a schematic diagram of the sewing machine, showing that the sewing machine head is located at the knitting position.

FIG. 11B shows a schematic diagram of the sewing machine, showing the withdrawal of the sewing machine head from the knitting position.

FIG. 11C is a schematic diagram of the sewing machine, showing that the sewing machine head is rotated approximately 90 degrees along the cutting tool arm from the knitting position.

FIG. 12 is a partial enlarged view of a knitting needle, a needle-shaped crochet hook, and a stitch forming handle on a sewing machine head of the sewing machine.

Claims (14)

A sewing machine for sewing an opening of a tubular knitted fabric includes a base, a sewing machine head, and a wire cutting device, the sewing machine head is connected to the base, the wire cutting device is movably connected to the base, and the sewing machine head has a knitting needle. A needle-shaped crochet hook and a stitch forming handle are used for knitting to form a knitted stitch. The thread cutting device is used to cut the knitted stitch. The feature is that the thread cutting device can move relative to the sewing machine head. . The sewing machine according to claim 1, wherein the sewing machine head is movably disposed on the base, and the wire cutting device is driven relative to the sewing machine head by being driven by the sewing machine head or by an independent actuator. The sewing machine according to claim 1, wherein the movement of the wire cutting device follows a circular or linear trajectory, or moves on a plane. The sewing machine according to claim 1, wherein the wire cutting device has a cutting tool arm, and the cutting tool arm is rotatably connected to the base. The sewing machine according to claim 4, wherein a stopper is provided between the cutting tool arm and the sewing machine head. The sewing machine according to claim 1, wherein the wire cutting device in the running state is connected with an air inlet. The sewing machine according to claim 6, wherein the wire cutting device has a fixed cutter and a movable cutter, and the air inlet is located behind the movable cutter. The sewing machine according to claim 1, wherein the sewing machine head is pivotally connected to the base and is driven by a cam of the sewing machine head on the base to rotate. The sewing machine according to any one of claims 1 to 8, wherein the distance between the formation position of the knitting seam and the wire cutting device is between 3 and 30 mm regardless of the position of the sewing machine head and the wire cutting device. Between changes. The sewing machine according to claim 9, wherein the distance varies between 20 and 30 mm. A knitting method for sewing the open end of a tubular knitted fabric, using a sewing machine according to claim 1, the steps include: forming the opening of the tubular knitted fabric into a plurality of pairs of coil groups arranged along a semicircle, the A sewing machine head of a sewing machine introduces a weaving thread to start weaving the paired coil groups to form a knitting stitch; and after completing the knitting operation of all the paired coil groups, the sewing machine head forms an additional knitting stitching. A movable wire cutting device on the sewing machine cuts the additional knitted seam; wherein the wire cutting device is movable relative to the sewing machine head. According to the knitting method described in claim 11, when the sewing machine head is left with another extra knitting seam for sewing another tubular knitted fabric open section, the sewing machine head is in the process of sewing the pair of coil groups , Use this wire cutting device to cut another additional knitted seam. According to the knitting method described in claim 11, after the extra knitting seam is cut, the length of the part of the knitting seam remaining on the tubular knitting fabric is 8 to 10 mm, and the part of the knitting seam remaining on the sewing machine head is The length is 20 to 30 mm. A sock produced by using the knitting method according to claim 11, the sock comprising two knitted stitches with a length of 8 to 10 mm at both ends thereof.