TWI856335B - Sewing machine and sewing method - Google Patents

Abstract

The present invention relates to a sewing machine, which comprises: a machine body and a displacement device installed on the machine body, wherein the displacement device has one or more thread outlets corresponding to one or more sewing needles of the sewing machine, and each thread outlet can allow a thread body to pass through; when the sewing machine is running, the displacement device drives the thread outlet to move back and forth on both sides of the sewing needle. In this way, the sewing machine sews at least one sewing thread on a material to be sewn, and one or more thread bodies pass through the thread outlet and are reciprocally arranged on both sides of the sewing needle, and the thread fixes the thread body on the material to be sewn. The present invention also relates to a sewing method for fixing the thread body with the sewing thread.

Description

Sewing machine and sewing method

The present invention relates to a sewing machine, and more particularly to a sewing machine having an innovative sewing structure and an innovative sewing method.

Existing sewing machines all use a sewing needle to penetrate the cloth (fabric) to sew the sewing thread to the cloth, and no sewing machine can fix the thread other than the sewing thread to the cloth.

One of the purposes of the present invention is to provide a sewing machine with an innovative structure, which can fix a thread body other than a sewing thread (i.e. a thread body other than a sewing thread) on a to-be-sewn object through a sewing thread.

One of the purposes of the present invention is to provide a sewing machine as mentioned above, so that the thread body can be fixed on the object to be sewn without passing through the object to be sewn.

One of the purposes of the present invention is to provide a sewing method for fixing a thread body other than the sewing thread (i.e., a thread body other than the sewing thread) with a sewing thread.

The sewing machine provided by the present invention comprises: A machine body, equipped with at least one needle bar, the bottom end of the needle bar has at least one sewing needle; A displacement device, installed on the machine body, and having at least one thread outlet, corresponding to the sewing needle, allowing at least one thread body to pass through the thread outlet; the displacement device drives the thread outlet to reciprocate on both sides of the sewing needle.

By means of the above structure, at least one sewing thread is sewn by the sewing needle on an object to be sewn; at least one thread body is passed through the thread outlet, and the displacement device reciprocates to lay the thread body on both sides of the sewing needle. During the sewing process, the sewing thread can fix the thread body on the object to be sewn.

The fixed wire body does not pass through the object to be sewn, so the wire body can be kept intact and the wire body can be prevented from being damaged.

In one implementation, the number of sewing strokes of the sewing needle is proportional to the number of displacement strokes of the thread outlet, and the ratio of the sewing stroke of the sewing needle to the displacement stroke of the thread outlet is not less than 2:1, preferably, between 2:1 and 10:1.

In one embodiment, the displacement device has a main shaft. When the main shaft rotates, the displacement device generates reciprocating motion, driving the outlet to reciprocate.

In one embodiment, the sewing machine has a transmission shaft, which drives the main shaft of the displacement device to rotate. When the transmission shaft rotates one circle, the sewing needle completes a sewing stroke; when the main shaft rotates one circle, the wire outlet completes a displacement stroke; the speed ratio of the transmission shaft to the main shaft is not less than 2:1, preferably, between 2:1 and 10:1.

In one embodiment, the displacement device includes: a main shaft, a reciprocating drive component and a reciprocating moving component, the main shaft is rotatably pivoted on the body; the reciprocating drive component is connected to the main shaft, and when the main shaft rotates, it drives the reciprocating drive component to reciprocate between a first position and a second position; the wire outlet is arranged on the reciprocating moving component; the reciprocating drive component drives the reciprocating moving component to reciprocate between an initial position and an end position, so that the wire outlet reciprocates on both sides of the sewing needle.

In one embodiment, the reciprocating drive component is an eccentric wheel connecting rod having an eccentric wheel end and a connecting rod end. The eccentric wheel end is mounted on the main shaft. The eccentric wheel connecting rod reciprocates in the radial direction of the main shaft, and the connecting rod end drives the reciprocating movement component to move.

In one embodiment, the reciprocating component is a swing arm having a swing fulcrum; the wire outlet is arranged on the swing arm; the eccentric wheel connecting rod drives the swing arm to swing back and forth between the initial position and the end position.

In one embodiment, it includes a rotating shaft rotatably mounted on the body; a swing arm connected to the rotating shaft; when the main shaft of the displacement device rotates, the rotating shaft is driven to rotate, driving the swing arm to reciprocate; the outlet is arranged on the swing arm.

In one embodiment, a reciprocating drive component is included, which is arranged between the main shaft and the rotating shaft. When the main shaft rotates, the reciprocating drive component is driven to reciprocate between a first position and a second position. The reciprocating drive component links the rotating shaft to reciprocate between a clockwise direction and a counterclockwise direction within an angle range.

In one embodiment, the displacement device further includes: a linkage mechanism disposed between the reciprocating drive component and the reciprocating moving component, and the reciprocating drive component drives the reciprocating moving component via the connecting rod mechanism.

In one embodiment, the linkage mechanism includes: a rotating member and a connecting rod, the rotating member has a rotating fulcrum; the connecting rod end of the eccentric wheel connecting rod is connected to the rotating member; one end of the connecting rod is connected to the rotating member, and the other end is connected to the rocker arm; the eccentric wheel connecting rod drives the rocker arm through the linkage mechanism.

In one embodiment, the sewing machine has a transmission mechanism, and the transmission mechanism has a transmission shaft; the transmission shaft is linked to the main shaft through a linkage assembly.

The present invention provides a sewing method, comprising: using at least one sewing needle of a sewing machine to sew at least one sewing thread on a material to be sewn in a sewing direction, and each sewing thread sews a plurality of sewing segments along the sewing direction; in the process of the sewing needle sewing the sewing thread, at least one thread body is reciprocated along the sewing direction on both sides of the sewing needle, and after the thread body moves from the first side to the second side of the sewing needle, it is pressed on the material to be sewn by one sewing segment of the sewing thread; after the thread body moves from the second side to the first side of the sewing needle, it is pressed on the material to be sewn by another sewing segment of the sewing thread.

Thus, when the sewing machine performs sewing operations, the sewing thread fixes the thread body to the object to be sewn.

In the above-mentioned sewing method, the sewing machine is equipped with a displacement device, which drives the thread body to move back and forth on both sides of the sewing needle. Each thread body is fixed by a stitch segment, and the thread body is against the stitch segment.

10, 10’, 10”, 10’”: sewing machine

11: Body

12: Machine head

13: Needle bar

14(14a~14c): sewing needle

15: Press the foot bar

16: Foot press

17: Motherboard

18: Sewing pinholes

19: Drive shaft

191:Pulley

20, 20’, 20”: linkage set

21: First connecting shaft

22: Pulley

23: Belt

24: Second connecting shaft

25, 26: Universal joint

28: Transmission shaft

30, 30’: displacement device

32: Bracket

34: Arm

35, 35’: Main axis

36: Support

40, 40’: Reciprocating drive component (eccentric wheel connecting rod)

401: Connecting rod end

42: Eccentric wheel

44: Connecting rod

441: Circle Department

50, 50’: Reciprocating component (rocker arm)

52: Hub terminal

54(54a~54c): Cable outlet

52:Shaft

56: Long groove

52: Suspension

572: Screw-on components

572: Free end

58: Tube body

70, 70’: linkage mechanism

71: Rotating parts

72: pivot

73: First end

74: Second end

76: Connecting rod

80: Fabric (to be sewn)

801: Front

802: Back

82:Seam

821: Cross-departmental

83(83a~83d):Seam segment

84(84a, 84b): Line body

86: Bottom line

90~98: Sewing structure

D: Sewing direction

X:Virtual line

P, Q: Position

T(T1~T3): Needle insertion

R: Right side

L: Left side

101~106: Gear

111: Rods

112: Joint

120: Rotating axis

122: Horizontal arm

The purpose, features and effects achieved by the present invention can be understood from the following descriptions and drawings of several preferred embodiments, among which: Figure 1 is a three-dimensional diagram of a sewing machine of the first preferred embodiment of the present invention.

Figure 2 is a three-dimensional diagram of the sewing machine of the first preferred embodiment of the present invention from another viewing angle.

Figure 3 is the front view of the sewing machine in Figure 1.

FIG. 4 shows a top view mainly showing the displacement device of the sewing machine in FIG. 1 , and other parts of the sewing machine are omitted in the figure.

Figures 5 to 7 show the three-dimensional diagram of the displacement device in Figure 1 and its motion status.

Figure 8 shows a top view of a seam line and a thread body being sewn on an object to be sewn.

Figure 9 is a cross-sectional view taken along line 9-9 of Figure 8.

Figures 10A to 10C show schematic diagrams of the sewing process of the sewing machine sewing the seam line and the thread body.

FIG. 11 shows a top view of another embodiment of sewing a seam line and a thread body on an object to be sewn.

FIG. 12 shows an embodiment of sewing a seam line and two seam bodies on an object to be sewn.

Figure 13 shows a schematic diagram of the thread outlet of the sewing needle and the swing arm in Figure 5.

Figure 14 is a partial three-dimensional diagram of the sewing machine of the second preferred embodiment of the present invention.

Figure 15 is a schematic diagram of the thread outlet of the sewing needle and the swing arm in Figure 14.

Figures 16 and 17 show the operating status of the sewing machine in Figure 14.

Figure 18 shows a top view of a plurality of seams and a plurality of thread bodies being sewn on an object to be sewn.

Figure 19 is a three-dimensional diagram of the sewing machine of the third preferred embodiment of the present invention.

Figure 20 is a side view of Figure 19.

Figure 21 is a three-dimensional diagram of the displacement device of this embodiment.

Figure 22 is a top view of Figure 21.

Figure 23 is a schematic diagram of a sewing machine of the fourth preferred embodiment of the present invention.

Figures 24A and 24B show schematic diagrams of the front and back of a sewing structure sewn by a one-needle three-thread overlock machine using the structure of the present invention, wherein a thread body of the present invention is fixed by a sewing thread.

Figures 25A and 25B show the front and back schematic diagrams of the structure of the present invention applied to the sewing structure of a two-needle four-thread overlock machine, wherein: the two-thread body of the present invention is fixed by two stitches.

Figures 26A and 26B show the front and back schematic diagrams of the structure of the present invention applied to the sewing structure of a three-needle three-thread three-machine sewing machine, wherein: the two-thread body of the present invention is fixed by two stitches.

Figures 27A and 27B show the front and back schematic diagrams of the structure of the present invention applied to the sewing structure of a three-line loom with two needles and four threads, wherein: the two-thread body of the present invention is fixed by two stitches.

Figures 28A and 28B show the front and back schematic diagrams of the structure of the present invention applied to the sewing structure of three-needle five-thread three-book loom sewing, wherein: the three-line body of the present invention is fixed by three stitches.

FIG. 1 and FIG. 2 show a sewing machine 10 of the first preferred embodiment of the present invention. Please refer to FIG. 8. The sewing machine 10 can sew a sewing thread 82 and a thread body 84 on a material to be sewn, such as cloth 80, fabric, leather, plastic, paper or the like. The thread body 84 is fixed to the material to be sewn by the sewing thread 82 and does not pass through the material to be sewn.

Please refer to Figures 1 to 3. The sewing machine 10 has a body 11. The head 12 of the body 11 is equipped with a needle bar 13 and a presser bar 15. The bottom end of the needle bar 13 is equipped with a sewing needle 14, and the bottom end of the presser bar 15 is equipped with a presser foot 16. The machine plate 17 of the sewing machine 10 is provided with a sewing needle hole 18, so that the sewing needle 14 can be inserted into the sewing needle hole 18. A feed tooth (not shown) is provided below the sewing needle hole 18. The sewing machine defines a sewing direction D at the sewing needle hole 18. The sewing direction D is the reciprocating movement direction of the feed tooth. The feed tooth continuously pushes the sewing object to be sewn to move along the sewing direction D. The body 11 is provided with a plurality of mechanisms interconnected with each other. The body 11 is provided with a transmission mechanism, which includes a transmission shaft 19 provided on the body 11, and the transmission shaft 19 is driven by a motor or a belt or a chain. The transmission mechanism drives all mechanisms of the sewing machine 10 to operate, including making the needle bar 13 move up and down reciprocatingly to perform sewing operations. The above structure is an existing structure of the sewing machine and will not be described in detail. The structure of the sewing machine 10 below the machine plate 17 is also omitted in this specification. The structures of other parts of the sewing machine are not related to the present invention and will not be described in detail.

The sewing machine 10 of the present invention further includes: a displacement device 30 and a thread outlet 54 provided on the displacement device 30, the thread outlet 54 being used to guide the thread body 84. The thread outlet 54 is located above the machine plate 17, corresponding to the sewing needle 14.

Please refer to Figures 3 to 5. The displacement device 30 is installed outside the body 11 and includes: a main shaft 35, a reciprocating driving component (40) and a reciprocating moving component (50).

A bracket 32 is fixedly mounted on one side of the machine body 11; the main shaft 35 is rotatably pivoted on the bracket 32 and can drive the reciprocating drive member (40) to operate. The main shaft 35 can be driven by another transmission mechanism, such as an electric motor, or by human power through a belt pulley to drive the main shaft. In this embodiment, the main shaft 35 is driven by the transmission shaft 19 of the sewing machine 10 itself, please refer to Figure 1, and the transmission shaft 19 drives the main shaft 35 through a linkage assembly 20. The linkage assembly 20 is installed outside the body 11, and has a first linkage shaft 21, which is rotatably installed on two bearings 211. The rear end of the first linkage shaft 21 is connected to the pulley 191 of the drive shaft 19 through a pulley 22 and a belt 23; a second linkage shaft 24, one end of which is connected to one end of the first linkage shaft 21 through a universal joint 25, and the other end is connected to one end of the main shaft 35 through a universal joint 26. Through the linkage assembly 20, the main shaft 35 can be driven to rotate when the drive shaft 19 rotates.

The reciprocating drive member is connected to the main shaft 35, and the main shaft 35 can drive the reciprocating drive member to reciprocate between a first position and a second position. The reciprocating drive member can be an eccentric member or a cam member. When the main shaft 35 rotates, the reciprocating drive member reciprocates in the radial direction of the main shaft 35, and then reciprocates between the first position and the second position. The reciprocating drive member of the preferred embodiment is an eccentric wheel connecting rod 40, whose two ends are respectively an eccentric wheel end and a connecting rod end 401. The eccentric wheel end is installed on the main shaft 35, and its connecting rod end 401 can reciprocate between the first position and the second position. Specifically, the eccentric wheel connecting rod 40 is composed of an eccentric wheel 42 and a connecting rod 44. The eccentric wheel 42 is fixed on the main shaft 35. One end of the connecting rod 44 is sleeved on the eccentric wheel 42 with a ring portion 441. When the eccentric wheel 42 rotates, the end of the connecting rod 44 (i.e., the connecting rod end 401) reciprocates between the first position and the second position.

A support 36 is mounted on the body 11 in an appropriate manner. For example, the bracket 32 extends an arm, and the support 36 is mounted on the arm, so that the support 36 becomes a part of the bracket 32. The support 36 of the preferred embodiment clamps the pressure foot rod 15 and is supported by the pressure foot rod 15. The bracket 32 and the support 36 can be made into a part of the body 11 for the installation of the displacement device 30.

The reciprocating member can be designed to be linearly displaced or swayingly displaced. The reciprocating member of the present embodiment is a swing arm 50, one end of which is a pivot end 52, which is rotatably pivoted on the support 36. The swing arm 50 uses the pivot end 52 as a swinging fulcrum and can swing back and forth between an initial position and an end position. A wire outlet 54 is located at one end of the swing arm 50 and is adjacent to the sewing needle 14. The connecting rod end 401 of the eccentric wheel connecting rod 40 can be directly connected to the swing arm 50 to drive the swing arm 50 to move. Please refer to Figure 4. When the eccentric wheel connecting rod 40 is located at the first position, it drives the rocker arm 50 to move to the initial position, so that the thread outlet 54 is located on one side of the needle 14; when the eccentric wheel connecting rod 40 is located at the second position, it drives the rocker arm 50 to move to the end position, so that the thread outlet 54 is located on the other side of the needle 14. Therefore, when the main shaft 35 rotates, the reciprocating drive component (40) drives the reciprocating moving component (50) to operate, so that the thread outlet 54 reciprocates on both sides of the needle 14.

Please refer to Figure 4. The location of the needle 14 forms a virtual line X in the sewing direction D. The two sides of the needle 14 are the two sides of the virtual line X. The thread outlet 54 of the swing arm 50 reciprocates on the two sides of the needle 14, which means that the thread outlet 54 reciprocates on the two sides of the virtual line X. The line connecting the position P on one side of the needle 14 and the position Q on the other side of the thread outlet 54 is not parallel to the virtual line X. Preferably, the line connecting the positions P and Q is perpendicular or approximately perpendicular to the virtual line X.

Please refer to FIG5 , the swing arm 50 has a shaft 55 and a suspension rod 57, the pivot end 52 is located at one end of the shaft 55; an elongated slot 56 is provided in the shaft 55; one end of the suspension rod 57 is connected to the elongated slot 56 of the shaft 55 by a screw element 571, and can be fixed at different positions of the elongated slot 56 to adjust the swing displacement of the suspension rod 57. A hollow tube 58 is fixed to the free end 572 of the suspension rod 57, and the free end (bottom end) of the tube 58 forms the wire outlet 54. Please refer to FIG2 , the aforementioned wire body 84 can be inserted from one end (top end) of the tube 58 and pass out from the wire outlet 54. FIG. 13 shows another embodiment of the wire outlet 54. A hole is provided at the free end 572 of the suspension rod 57. The hole forms the wire outlet 54. The wire body 84 is passed through the wire outlet 54, entering from one end of the wire outlet 54 and exiting from the other end.

In the preferred embodiment, the eccentric wheel connecting rod 40 drives the swing arm 50 through the linkage mechanism 70. The linkage mechanism 70 includes a rotating member 71 and a connecting rod 76. The central part of the rotating member 71 is pivoted on the arm 34 of the bracket 32 by a pivot 72, so that the rotating member has a rotating fulcrum. When the rotating member 71 rotates, its first end and second ends 73 and 74 can produce reverse displacement. The connecting rod end 401 of the eccentric shaft connecting rod 40 is pivoted to the first end 73 of the rotating member 71. One end of the connecting rod 76 is connected to the second end 74 of the rotating member 71, and the other end is connected to the rod body 55 of the swing arm 50. Thereby, the eccentric wheel connecting rod 40 drives the swing arm 50 to reciprocate through the linkage mechanism 70.

Please refer to Figure 2. When the sewing machine 10 is in use, the sewing thread 82 is inserted into the sewing needle 14, and the thread body 84 is inserted from the thread outlet 54 of the swing arm 50. The thread body 84 can be reflective yarn, luminous yarn, decorative yarn, conductive yarn, metallic yarn or other thread with specific properties or functions, and can also be various threads, fibers or yarns.

Taking the case of sewing the sewing thread 82 and the thread body 84 on a piece of fabric 80 as an example, when the sewing machine 10 is operated, the operations shown in FIG. 4 and FIG. 5 to FIG. 7 will be generated. Please refer to Figure 5, which shows that the eccentric wheel connecting rod 40 is located at the first position of its reciprocating stroke, and the swing arm 50 is located at the initial position of its reciprocating displacement stroke. At this time, based on the direction of the figure, the maximum eccentricity of the eccentric wheel connecting rod 40 is located on the right side, and its connecting rod end 401 is located at the rightmost dead point of the stroke. The connecting rod 76 of the linkage mechanism 70 and the swing arm 50 are located at the leftmost dead point of their displacement stroke. The thread outlet 54 of the swing arm is in the initial position, located on one side (first side) of the sewing needle 14, and the needle rod 13 and the sewing needle 14 are located at the upper dead point of their sewing stroke.

When the sewing machine 10 is in operation, the transmission shaft 19 drives the displacement device 30 to operate via the linkage group 20. At this time, the linkage group 20 drives the main shaft 35 to rotate clockwise. Please refer to Figure 6, which shows that the main shaft 35 and the eccentric wheel connecting rod 40 rotate 90 degrees clockwise. At this time, the eccentric shaft connecting rod 40 and its connecting rod end 401 will be displaced to the left by half of the stroke, and the rotating member 71 rotates counterclockwise, so that the second end 74 of the rotating member 71 drives the connecting rod 76 and the swing arm 50 to move to the right by half of the stroke. The needle bar 13 and the sewing needle 14 move downward to the lower dead point of the sewing stroke, and the sewing needle 14 passes through the fabric 80 with the sewing thread 82. At the same time, the outlet 54 moves to the middle position shown at point B in Figure 4, which is half of its travel.

When the transmission shaft 19 drives the main shaft 35 to continue to rotate 90 degrees clockwise to the position shown in FIG. 7, the eccentric shaft connecting rod 40 and its connecting rod end 401 move to the left to the dead point of the stroke, that is, the second position; the rotating member 71 rotates counterclockwise to the dead point of its rotation stroke, and the second end 74 of the rotating member 71 drives the connecting rod 76 and the rocker arm 50 to move rightward to the rightmost end of its stroke. The end point, that is, the swing arm 50 swings to the end position, the thread outlet 54 moves to the other side (second side) of the sewing needle 14, driving the thread body 84 to the other side (second side) of the sewing needle 14. At the same time, the needle bar 13 and the sewing needle 14 return to the upper end point of their sewing stroke, and the sewing needle 14 passes through the fabric 80 upward with the sewing thread 82, and the sewing needle 14 completes a sewing stroke.

When the main shaft 35 rotates 180 degrees clockwise from the position of FIG. 7, it returns to the position of FIG. 5, so that the eccentric wheel connecting rod 40 returns from its second position to the first position, and drives the rotating member 71 to rotate clockwise, so that the second end 74 of the rotating member 71 drives the connecting rod 76 and the rocker arm 50 to move leftward to the leftmost dead point of its displacement stroke, and the rocker arm 50 returns to At the initial position, the thread outlet 54 returns to one side (first side) of the sewing needle 14, and drives the thread body 84 to move from the other side (second side) of the sewing needle 14 to one side (first side) of the sewing needle 14. At the same time, the needle bar 13 and the sewing needle 14 complete a sewing stroke again, that is, the sewing needle 14 carries the sewing thread 82 downward through the fabric 80 and upward out of the fabric 80.

Thus, when the sewing machine 10 is in operation, the needle bar 13 and the sewing needle 14 repeat their sewing strokes to sew the sewing thread 82 to the fabric 80. At the same time, the displacement device 30 reciprocates, driving the thread outlet 54 to reciprocate on both sides of the sewing needle 14, and the thread body 84 is reciprocated on both sides of the sewing needle 14 and pressed by the sewing thread 82, completing the sewing operation of sewing the sewing thread 82 and the thread body 84 to the object to be sewn.

In the above-mentioned operation process, the sewing needle 14 completes two sewing strokes, and the swing arm 50 and its thread outlet 54 complete one displacement stroke, and the thread outlet moves from the first side of the sewing needle 14 to the second side of the sewing needle, and then returns to the first side of the sewing needle. Therefore, the ratio of the sewing stroke of the sewing needle 14 to the displacement stroke of the swing arm 50 is 2:1.

FIG8 shows a top view of the sewing machine 10 sewing the sewing thread 82 and the thread body 84 onto the fabric 80, and the sewing thread 82 fixes the thread body 84.

Please refer to FIG. 9 . During the sewing process, the fabric 80 is continuously fed along the sewing direction D. The sewing needle of the sewing machine 10 pierces the fabric 80 at a lower needle position T, driving the sewing thread 82 from the front surface 801 of the fabric 80 to the bottom surface 802 of the fabric. Then the sewing needle 14 pulls the sewing thread 82 upward to the front surface 801 of the fabric, completing a sewing stroke. During a sewing stroke, the sewing thread 82 generates a turn at the bottom surface 802 of the fabric 80, and the turn forms a span 821, which crosses a bottom line 86 (the bottom line is not the subject of the present invention and will not be described in detail). When performing the next sewing stroke, the fabric 80 moves a distance on the sewing machine 10, and the needle 14 performs another sewing stroke at another lower needle position T, driving the sewing thread 82 to penetrate the bottom surface 802 of the fabric 80 again, and then driving the sewing thread 82 upward to pass through the front surface 801 of the fabric 80. In this way, the sewing stroke is repeated. In each sewing stroke, the sewing thread 82 forms a span 821 on the bottom surface of the fabric 80, so that the bottom thread 86 and the sewing thread 82 are hooked and pulled with each other. At the same time, on the front side 801 of the fabric 80, the seam line 82 forms a seam segment 83 at every two adjacent lower stitches T, and the seam segments 83 are arranged along the sewing direction D of the fabric 80. Usually, the seam segments 83 are of the same length and are arranged at equal intervals. The seam segments 83 shown in the figure are arranged in a straight line as an example, but this is not limited to this. For example, the seam segments 83 can also be arranged in an arc shape.

During the sewing process, the seam 82 and the thread body 84 are continuously released, and the thread body 84 is pressed by the seam section 83 of the seam 82 and fixed to the front side 801 of the fabric 80. The thread body 84 is laid on both sides of the seam 82 along the sewing direction D, passing through the seam sections 83 in sequence, and is pressed by the seam sections 83. In the sewing direction D, the thread body 84 is close to the seam 82 that fixes the thread body.

FIG10 is a schematic diagram showing the sewing process of the seam thread 82 and the thread body 84. As shown in FIG10A, during sewing, the fabric 80 moves in the sewing direction D, and the needle 14 performs a sewing stroke at the lower needle position T1. The displacement device 30 drives the thread outlet 54 from the initial position to the end position, so that the thread body 84 is released from the first side (e.g., the right side R) of the needle to the second side (e.g., the left side L). Next, as shown in FIG. 10B , the sewing needle performs another key stroke at another needle insertion position T2 and generates a stitch section 83a between the needle insertion positions T1 and T2, pressing the thread body 84. Afterwards, the displacement device 30 drives the thread outlet 54 to move from the end position to the initial position, and pulls the thread body 84 from the second side (left side L) to the first side (right side R). As shown in FIG. 10C As shown, the sewing needle performs another sewing stroke at the next lower needle position T3, so that the sewing line 82 generates another sewing segment 83b, pressing the thread body 84. This is repeated to complete the sewing structure 90 shown in Figure 8. The sewing line 82 and the thread body 84 are sewn on the front side of the fabric 80, and the thread body 84 reciprocates through the sewing segments 83 on the left and right sides of the sewing line 82.

In the sewing structure 90 shown in FIG8 , the ratio of the sewing stroke of the sewing needle 14 to the displacement stroke of the swing arm 50 is 2:1 (for example, the speed ratio of the transmission shaft 19 to the main shaft 35 is 2:1), and the thread body 84 passes through the adjacent sewing segments 83 in sequence and regularly, and is pressed by each sewing segment 83.

Changing the speed ratio of the drive shaft 19 and the main shaft 35 can change the proportional relationship between the sewing stroke of the needle 14 and the displacement stroke of the swing arm 50. For example, adjusting the speed ratio to 3:1 or 4:1 can form a sewing structure 91 as shown in FIG. 11. The thread 84 does not pass through all the seam segments 83, but passes through the separated seam segments 83 regularly and is pressed by the separated seam segments 83. The seam segments 83c that press the thread 84 are separated, and the seam segments 83d located between the seam segments 83c do not press the thread 84. Two adjacent seam segments 83c that press the thread 84 can be separated by one to several seam segments 83d that do not press the thread. FIG11 shows that two adjacent sewing segments 83c pressing the thread body 84 are separated by a sewing segment 83d not pressing the thread body. The ratio of the sewing stroke of the needle 14 to the displacement stroke of the swing arm 50 is not less than 2:1. In practice, the ratio is between 2:1 and 10:1, preferably between 2:1 and 6:1, and most preferably between 2:1 and 4:1.

In addition, as shown in FIG. 12 , in practice, two wire outlets can be provided on the sewing machine 10 to reciprocately displace on both sides of the sewing needle to lay two wire bodies 84a and 84b, and the two wire bodies 84a and 84b pass through the sewing section 83 of the sewing line 82 and are pressed by the sewing section 83 to form the sewing structure 92 of FIG. 12 . The two wire bodies 84a and 84b can pass through the sewing sections 83 symmetrically or asymmetrically. The two wire outlets can be driven by a displacement device 30, or the sewing machine can be provided with two displacement devices, and the two wire outlets are driven by the two displacement devices respectively.

Figure 14 shows the sewing machine 10' of the second preferred embodiment of the present invention. Only a partial structure is shown in the figure, and the same components use the component symbols of the first preferred embodiment.

The sewing machine 10' is equipped with multiple needle bars 13, multiple sewing needles 14, multiple presser bars 15 and multiple presser feet 16. For example, 2 to 10 sewing needles 14 can sew multiple seams at the same time. This embodiment shows three needle bars, three sewing needles and three presser feet. The sewing machine 10' can sew three seams at the same time.

The support 36 clamps one or more foot press rods 15. The suspension rod 57 of the swing arm 50 is provided with three thread outlets 54, which correspond to the three sewing needles 14 respectively, so that three thread bodies 84 can pass through the three thread outlets 54 respectively. Please refer to Figure 15. When the swing arm 50 reciprocates, the three thread outlets 54 reciprocate on both sides of the corresponding sewing needles 14 respectively.

As shown in Figures 16 to 18, when the sewing machine 10' performs sewing operations, the three needles 14 (14a to 14c) perform sewing strokes, and can sew three sewing threads 82 on a sewing object 80 at the same time, and the swing arm 50 drives the three thread outlets 54 (54a to 54C) to move back and forth on both sides of the three needles, so that the three thread bodies 84 move on both sides of the three needles and are pressed by the sewing segments 83 of the sewing threads 82. In this way, multiple thread bodies 84 can be fixed on the sewing object at the same time to form the sewing structure 93 of Figure 18.

FIG. 19 to FIG. 21 show a sewing machine 10' of the third preferred embodiment of the present invention, which has a displacement device 30' mounted on the machine body 11. The sewing machine may be a machine having a needle 14 or a plurality of needles. The main shaft 35' of the displacement device 30' is disposed on the machine body 11 and is driven by a drive shaft 19 of the machine body 11 through a linkage group 20' formed by gears 101 and 102. The speed ratio of the transmission shaft 19 to the main shaft 35' is 2:1 to 10:1. When the main shaft 35' rotates, a reciprocating member (50') can be linked by a reciprocating drive member (40') to reciprocate. In this embodiment, the reciprocating drive member is an eccentric shaft connecting rod 40', and the reciprocating member is a swing arm 50' having one or more outlets 54.

A rotating shaft 120 is rotatably pivoted on the machine body 11, and one end (bottom end) thereof passes through the machine body. One end 501 of the swing arm 50' is connected to one end of the rotating shaft 120. The eccentric shaft connecting rod 40' can drive the rotating shaft 120 to rotate, thereby driving the swing arm 50' to move back and forth. The rotating shaft 120 is provided with a transverse arm 122; the eccentric wheel connecting rod 40' of the eccentric wheel connecting rod 40' is fixed to the main shaft 35', and its connecting rod 44 is connected to a rod 111, and one end of the rod 111 is pivoted to the transverse arm 122 of the shaft rod 120 by a pivoting portion 112. The swing arm 50' has a suspension rod 57, one end of which is connected to the swing arm 50', and the other end of which is provided with a wire outlet 54 for the wire body 84 to pass through. The rod 111 and the shaft 120 form a linkage mechanism 70', so that the eccentric shaft connecting rod 40' drives the swing arm 50' to move. The shaft 120 is the swing fulcrum of the swing arm 50'.

Please refer to Figure 22. When the main shaft 35' rotates, the connecting rod end (i.e., connecting rod 44) of the eccentric shaft connecting rod 40' drives the rod 111 to move horizontally. The rod drives the shaft 120 to reciprocate between the clockwise direction and the counterclockwise direction within an angle range through the transverse arm 122. In turn, the rocker arm 50' and the suspension rod 57 are driven to reciprocate angularly.

As shown in FIG22, when the eccentric wheel connecting rod 40' is in the first position, the rocker arm 50' is in an initial position, and the thread outlet 54 is located on one side of the needle 14 (as shown by the solid line in FIG22); when the eccentric wheel connecting rod 40' is in the second position, the rotating shaft 120 is driven to rotate clockwise, so that the rocker arm 50' is displaced clockwise to an end position, so that the thread outlet 54 is located on the other side of the needle 14 (as shown by the dotted line in FIG22). When the eccentric shaft connecting rod 40' returns to the first position, the rotating shaft 120 is driven to rotate counterclockwise, so that the rocker arm 50' returns counterclockwise to the initial position. Therefore, when the displacement device 30' is actuated, the thread outlet 54 reciprocates on both sides of the needle 14. The speed ratio of the drive shaft 19 and the main shaft 35' in this embodiment is 2:1, so that the sewing thread 82 and the thread body 84 form the sewing structure 90 of Figure 8.

FIG. 23 is a fourth preferred embodiment of the sewing machine 10'" of the present invention, and its displacement device 30 is the same as that shown in the first preferred embodiment, and it is unnecessary to describe it in detail.

The linkage assembly 20" of the sewing machine 10'" has a transmission shaft 28, which is installed on the machine body 11. One end of the transmission shaft 28 is engaged with a gear 104 of the transmission shaft 19 of the sewing machine through a gear 103, and the other end is engaged with a gear 106 of the main shaft 35 of the displacement device 30 through a gear 105. In this way, the transmission shaft 19 can drive the main shaft 35 through the linkage assembly 20", so that the displacement device 30 is actuated. Similarly, the speed ratio of the transmission shaft 19 to the main shaft 35' is 2:1 to 10:1.

Figures 8, 11, 12 and 18 show that the stitch 82 is sewn on the fabric in a flat-bed sewing machine. The structure of the present invention can be applied to the stitch structure formed by different types of sewing machines, such as a thread babylock (thread overlock), a three-bed machine (thread coverstitch; thread coverstitch with binding), or a flatlock machine. The flatlock machine can be divided into a one-needle (one sewing needle) three-thread (three-stitch) and a two-needle four-thread model; the three-bed machine has a two-needle three-thread, two-needle four-thread, and three-needle five-thread model; and the flatlock machine is a four-needle six-thread sewing machine.

24A and 24B show the displacement device (not shown) of the present invention disposed on a one-needle three-thread copier (not shown), and the front (FIG. 24A) and back (FIG. 24B) of a sewing structure 94 sewn on a fabric 80, which includes three sewing lines and a line body (reflective yarn, luminous yarn, conductive line body, etc.) 84. One of the three sewing lines 82 extends linearly on the front of the sewing structure 94, and the sewing line 82 has a plurality of sewing segments 83. The displacement device of the present invention reciprocates the thread body 84 on both sides of the needle (not shown) of the copier, so that the thread body 84 is pressed and fixed by the slit 83. Please refer to the above description for the process of thread body 84 being fixed by slit 83. The connection structure between the three slits is not the subject of the present invention and will not be described in detail.

Figures 25A and 25B show the front (Figure 25A) and back (Figure 25B) of a sewing structure 95 produced by placing the displacement device of the present invention on a two-needle four-thread copier (not shown), which includes four sewing lines and a two-thread body 84. Two of the four sewing lines 82 are sewn on the front of a fabric 80 and have a plurality of sewing segments 83 extending linearly. The displacement device reciprocates the two-thread body 84 on both sides of the two sewing needles of the copier, so that the two-thread body 84 is pressed by the sewing segments 83 of the two sewing lines 82 and fixed to the front of the fabric.

Figures 26A and 26B show that the displacement device of the present invention is set on the front (Figure 26A) and back (Figure 26B) of a sewing structure 96 sewn by a two-needle three-thread three-machine machine (not shown), which includes three sewing lines and a two-thread body 84. Two of the three sewing lines 82 are sewn on the front of the fabric 80 and have a plurality of sewing segments 83 extending linearly. The displacement device reciprocates the two-thread body 84 on both sides of the two sewing needles of the three-machine machine so that the two-thread body 84 is fixed by the sewing segments 83.

Figures 27A and 27B show that the displacement device of the present invention is set on the front (Figure 27A) and back (Figure 27B) of a sewing structure 97 sewn by a two-needle four-thread three-machine (not shown), which includes four sewing lines and a two-thread body 84. Two of the four sewing lines 82 are sewn on the front of the fabric 80 and have a plurality of sewing segments 83 extending linearly. The displacement device reciprocates the two-thread body 84 on both sides of the two sewing needles of the three-machine, so that the two-thread body 84 is fixed by the sewing segments 83.

Figures 28A and 28B show that the displacement device of the present invention is set on the front (Figure 28A) and back (Figure 28B) of a sewing structure 98 sewn by a three-needle five-thread three-machine machine (not shown), which includes five stitches and a three-wire body 84. Three stitches 82 of the five stitches are sewn on the front of the fabric 80 and have a plurality of stitch segments 83 extending linearly. The displacement device reciprocates the three-wire body 84 on both sides of the three needles of the three-machine machine so that the three-wire body 84 is fixed by the stitch segments 83 of the three stitches 82.

The stitching structure of the aforementioned four-needle six-thread parallel machine has four stitches 82 located on the front side of the fabric; one or four threads can be fixed by the stitches of the stitches.

Figures 24A to 28A exemplify that a plurality of thread bodies 84 are fixed by the sew segments 83 of a plurality of sews 82. In practice, only one thread body 84 may be fixed by one of the sews.

The present invention provides a sewing machine with an innovative sewing structure, which can fix one or more sewing threads and one or more thread bodies 84 on an object to be sewn, and the thread body 84 does not pass through the object to be sewn, so the structure and function of the thread body can be maintained intact to avoid damage or reduction of the function of the thread body.

The sewing machine of the present invention is an unprecedented creation, and the sewing method of the sewing machine is also the first method of its kind. The embodiments disclosed in the present invention are only for the purpose of illustrating the technical means of the present invention and are not intended to be limiting. Any equivalent modifications of the present invention shall be deemed to be within the scope of protection of the present invention.

11: Body

12: Machine head

13: Needle bar

14: Sewing needle

15: Press the foot bar

16: Foot press

17: Motherboard

18: Sewing pinholes

19: Drive shaft

20: Linkage group

21: First connecting shaft

22: Pulley

23: Belt

24: Second connecting shaft

25: Universal joint

30: Displacement device

36: Support

50: Reciprocating component

54: Cable outlet

57: Suspension

58: Tube body

82:Seam

84: Line body

D: Sewing direction

Claims (15)

A sewing machine comprises: a machine body, having a machine plate and at least one needle bar, the bottom of the needle bar having one or more sewing needles; a displacement device, externally connected to the machine body, having one or more thread outlets, located above the machine plate, for one or more thread bodies to pass through the thread outlets; each thread outlet corresponds to one sewing needle; the displacement device drives the thread outlet to reciprocate on both sides of the sewing needle; each thread outlet is only on the two sides of the sewing needle to which it corresponds. The sewing machine has a transmission shaft; a linkage group, which is installed on the machine body and connected to the transmission shaft and the displacement device; the transmission shaft drives the displacement device through the linkage group; the needle completes a sewing stroke when it is displaced up and down, and the outlet completes a displacement stroke when it is displaced and reset. The number of sewing strokes is proportional to the number of displacement strokes of the outlet. The ratio of the sewing stroke of the needle to the displacement stroke of the outlet is not less than 2:1. The sewing machine as described in claim 1, wherein: the displacement device has a main shaft, and when the main shaft rotates, the displacement device generates reciprocating motion, driving the wire outlet to reciprocate. The sewing machine as described in claim 2, wherein: the transmission shaft drives the main shaft of the displacement device to rotate, and when the transmission shaft rotates one circle, the sewing needle completes one sewing stroke; when the main shaft rotates one circle, the thread outlet completes one displacement stroke; the speed ratio of the transmission shaft to the main shaft is not less than 2:1. The sewing machine as described in claim 1, wherein: the displacement device comprises: a main shaft, a reciprocating drive component and a reciprocating moving component, the main shaft is rotatably pivoted on the machine body; the reciprocating drive component is connected to the main shaft, and when the main shaft rotates, the reciprocating drive component is driven to reciprocate between a first position and a second position; the wire outlet is arranged on the reciprocating moving component; the reciprocating drive component drives the reciprocating moving component to reciprocate between an initial position and an end position, so that the wire outlet reciprocates. The sewing machine as described in claim 4, wherein: the reciprocating driving member is an eccentric wheel connecting rod member having an eccentric wheel end and a connecting rod end, the eccentric wheel end is mounted on the main shaft, the eccentric wheel connecting rod member reciprocates in the radial direction of the main shaft, and the connecting rod end drives the reciprocating moving member to move. The sewing machine as described in claim 5, wherein: the reciprocating member is a swing arm having a swing fulcrum; the wire outlet is arranged on the swing arm; the eccentric wheel connecting rod drives the swing arm to swing back and forth between the initial position and the end position. The sewing machine as described in claim 2 comprises: a rotating shaft rotatably mounted on the machine body; a swing arm connected to the rotating shaft; when the main shaft of the displacement device rotates, the rotating shaft is driven to rotate, driving the swing arm to reciprocate; the wire outlet is arranged on the swing arm. A sewing machine as described in claim 7, wherein: a reciprocating drive member is disposed between the main shaft and the rotating shaft, and when the main shaft rotates, the reciprocating drive member is driven to reciprocate between a first position and a second position, and the reciprocating drive member is linked to the rotating shaft to reciprocate. The sewing machine as described in claim 4, wherein: the displacement device further comprises: a linkage mechanism disposed between the reciprocating drive member and the reciprocating moving member, the reciprocating drive member drives the reciprocating moving member via the connecting rod mechanism. The sewing machine as described in claim 6, wherein: the displacement device further comprises: a linkage mechanism, including: a rotating member and a connecting rod, the rotating member has a rotating fulcrum; the connecting rod end of the eccentric wheel connecting rod is connected to the rotating member; one end of the connecting rod is connected to the rotating member, and the other end is connected to the swing arm; the eccentric wheel connecting rod drives the swing arm through the linkage mechanism. A sewing machine as described in claim 4, wherein: the sewing machine has a transmission mechanism, the transmission mechanism has a transmission shaft; the transmission shaft and the main shaft are connected by a linkage assembly. The sewing machine as described in claim 6, wherein: the machine body is equipped with at least one foot presser; and further comprises: a support connected to the foot presser; one end of the swing arm is pivoted on the support. The sewing machine as described in claim 1, wherein: the linkage assembly is externally connected to the machine body, connecting the drive shaft and the displacement device. A sewing method includes: using one or more sewing needles of a sewing machine to sew one or more sewing threads on a to-be-sewn object in a sewing direction, and each sewing thread sews a plurality of sewing sections along the sewing direction; in the process of the sewing needle sewing the sewing thread, the sewing machine uses one or more thread outlets to reciprocately lay out one or more thread bodies along the sewing direction on both sides of the sewing needle, each of the thread outlets corresponds to one of the sewing needles, and each of the thread outlets only reciprocates on both sides of the corresponding sewing needle; each of the thread outlets drives a thread body from the first thread outlet of the corresponding sewing needle to the second thread outlet of the corresponding sewing needle. After moving to the second side, the thread body is pressed on the object to be sewn by a sewing section of the corresponding sewing thread; after each of the thread outlets drives the thread body to move from the second side of the corresponding sewing needle to the first side, the thread body is pressed on the object to be sewn by another sewing section of the corresponding sewing thread; the sewing needle completes a sewing stroke when it moves up and down, and the thread outlet completes a displacement stroke when it moves back, and the number of sewing strokes is proportional to the number of displacement strokes of the thread outlet, and the ratio of the sewing stroke of the sewing needle to the displacement stroke of the thread body is not less than 2:1. The sewing method as described in claim 14, wherein: the sewing machine is equipped with a displacement device, and the displacement device drives the thread outlet to move back and forth on both sides of the sewing needle; each of the thread bodies is fixed by a sewing segment of the sewing thread.

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