Spinning mechanism of sewing machine and sewing machine

Abstract

The invention relates to the technical field of sewing machines, in particular to a needling mechanism of a sewing machine and the sewing machine comprising the needling mechanism. The needle rod is vertically arranged in the vertical direction, and a machine needle is arranged at the lower end of the needle rod; the needle rod pricking head is fixedly arranged on the needle rod; one end of the rotary connecting rod is hinged to the needle rod pricking head through a connecting pin shaft perpendicular to the needle rod, and a rotary pin shaft is arranged at the other end of the rotary connecting rod; the curved-surface sliding groove is fixedly arranged and opposite to the needle rod at intervals, the curved-surface sliding groove extends from top to bottom and is provided with a curved-surface section extending in an arc shape, and the rotating pin shaft is in sliding fit with the curved-surface sliding groove; the eccentric crank is driven by the upper shaft to rotate around the center of the eccentric crank, and the eccentric crank is provided with an eccentric point with an increased eccentric distance; one end of the needle bar connecting rod is hinged to the eccentric point position of the eccentric crank through an eccentric pin shaft, and the other end of the needle bar connecting rod is hinged to the rotating pin shaft; and the upper shaft, the eccentric pin shaft, the rotating pin shaft and the connecting pin shaft are parallel to one another. The distance between the needle at the upper dead center and the upper surface of the needle plate can be increased.

Description

Technical Field

[0001] The present invention relates to the technical field of sewing machines, and in particular to a material-piercing mechanism of a sewing machine and a sewing machine comprising the material-piercing mechanism. Background Art

[0002] like Figure 1 As shown, the conventional sewing machine material-piercing mechanism in the prior art is that the eccentric crank 1a is driven by the upper shaft to rotate 360° around the center of the eccentric crank 1a. The eccentric crank 1a is provided with an eccentric point with an eccentric distance from the center of the eccentric crank 1a. The eccentric point position of the eccentric crank 1a is hinged to one end of the needle bar connecting rod 2a. The other end of the needle bar connecting rod 2a is hinged to the middle of the needle bar piercing head 3a and is between the slide groove seat 5a and the needle bar 6a. One end of the needle bar piercing head 3a is fixed at the middle position of the needle bar 6a, and the other end of the needle bar piercing head 3a is sleeved with a rectangular slider 4a. The slide groove seat 5a is provided with a vertical slide groove parallel to the needle bar 6a. The slider 4a on the needle bar piercing head 3a can be slid up and down and embedded in the vertical slide groove on the slide groove seat 5a, thereby realizing that the eccentric crank 1a driven by the upper shaft drives the needle bar 6a to move up and down in the vertical direction. The lower end of the needle bar 6a is equipped with a needle chuck 7a, on which a machine needle 8a is arranged. The machine needle 8a is located above the needle plate 11a, and a curved needle 12a is arranged below the needle plate 11a. The curved needle 12a is driven by a curved needle driving mechanism and cooperates with the up and down movement of the machine needle 8a to hook the thread. According to the cooperation relationship between the machine needle 8a and the curved needle 12a when hooking the thread, the distance between the machine needle 8a and the upper surface of the needle plate 11a at the upper dead point (that is, the highest point where the machine needle 8a rises above the needle plate 11a) is usually less than 10 mm. In order to realize the sewing process, a tension needle 9a and a presser foot 10a are arranged between the needle chuck 7a and the needle plate 11a. The height of the presser foot 10a is limited by the height position of the upper dead point of the machine needle 8a, making it difficult to meet customer needs for the sewing of ultra-thick clothing fabrics.

[0003] In addition, in the conventional piercing mechanism, the changing trend of the needle 8a's downward piercing and upward movement is limited by the structure. The speed change law of the needle 8a's downward piercing movement is acceleration-deceleration-acceleration, and vice versa. In the stitch construction stages such as the bending needle 12a's offline needle thread loop, the generation of the needle thread loop, the bending needle 12a's hooking of the needle thread loop, and the tightening of the needle thread several times, it is difficult to find the best speed section (sewing tension) in the relatively simple needle 8a's movement change law to maintain the stitching process without loosening and with a suitable tightening degree, thereby restricting the higher requirements of the new fabric on the sewing process and limiting the adaptability of the sewing machine to clothing fabrics. Summary of the invention

[0004] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a material-piercing mechanism of a sewing machine, which can increase the distance between the upper dead point of the machine needle and the upper surface of the needle plate.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The present invention provides a material-piercing mechanism of a sewing machine, comprising: a needle bar, which is vertically arranged in the up-down direction and has a machine needle installed at the lower end; a needle bar piercing head, which is fixed on the needle bar; a rotating connecting rod, one end of which is hinged to the needle bar piercing head through a connecting pin shaft perpendicular to the needle bar, and the other end of which is provided with a rotating pin shaft; a curved slide groove, which is fixedly arranged and spaced opposite to the needle bar, the curved slide groove extends from top to bottom and has a curved surface section extending in an arc shape, and the rotating pin shaft is slidably matched with the curved slide groove; an eccentric crank, which is driven by an upper shaft to rotate around its own center, and the eccentric crank has an eccentric point arranged to increase the eccentric distance; a needle bar connecting rod, one end of which is hinged to the eccentric point position of the eccentric crank through an eccentric pin shaft, and the other end is hinged to the rotating pin shaft; the upper shaft, the eccentric pin shaft, the rotating pin shaft and the connecting pin shaft are parallel to each other.

[0007] Preferably, the curved slide groove further has an upper vertical section and a lower vertical section extending vertically, and the upper vertical section, the curved section and the lower vertical section are connected in sequence from top to bottom.

[0008] Preferably, the curved slide groove extends in an arc shape from top to bottom as a whole.

[0009] Preferably, a sliding sleeve is sleeved on one end of the rotating pin away from the rotating connecting rod, and the sliding sleeve can be slidably embedded in the curved sliding groove along the curved sliding groove.

[0010] Preferably, the maximum swing angle of the rotary link is less than 90°.

[0011] Preferably, it also includes a slide groove seat, the curved slide groove is arranged on the slide groove seat, and the slide groove seat is fixed on the casing of the sewing machine.

[0012] Preferably, a needle chuck is provided at the lower end of the needle bar, and a plurality of machine needles are mounted on the needle chuck. The plurality of machine needles are arranged in a row at intervals, and the needle tips of the plurality of machine needles are arranged in sequence from high to low.

[0013] The present invention also provides a sewing machine, comprising the material-piercing mechanism of the sewing machine as described above.

[0014] Preferably, it also includes a needle plate, a bent needle and a bent needle drive assembly, the needle plate is located below the needle bar, the bent needle is located below the needle plate, and the bent needle drive assembly drives the bent needle to move and cooperates with the up and down movement of the machine needle to form the sewing line of the sewing machine.

[0015] Compared with the prior art, the present invention has significant improvements:

[0016] The piercing mechanism of the sewing machine of the present invention designs the curved slide groove as a non-vertical form with a curved surface segment extending in an arc shape, and a rotating connecting rod and a rotating pin are added between the curved slide groove and the needle bar piercing head. The rotating connecting rod realizes the reversing sliding of the rotating pin in the curved surface segment of the curved slide groove, and the needle bar connecting rod is hinged with the rotating connecting rod. Compared with the piercing mechanism of the prior art, the sliding block on the needle bar piercing head is directly slidably embedded in the vertical slide groove on the slide groove seat, and when the main shaft speed remains unchanged, due to the eccentric point of the eccentric crank The eccentricity increase setting increases the lifting speed of the needle bar connecting rod, and the curved surface segment design of the curved slide groove extending in an arc shape increases the stroke, thereby keeping the overall duration of the embroidery process unchanged, and at the same time the acceleration of the needle movement can be regulated, thereby breaking the timing characteristics of the construction stitches of the prior art, and achieving the goal of increasing the distance between the upper dead point of the needle and the upper surface of the needle plate while completing the construction stitches, thereby increasing the material discharge space and increasing the maximum thickness of the sewable fabric, effectively solving the sewing needs of ultra-thick clothing fabrics. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a conventional sewing machine material-piercing mechanism in the prior art.

[0018] Figure 2 It is a structural schematic diagram of a material-piercing mechanism of a sewing machine according to an embodiment of the present invention.

[0019] Figure 3 yes Figure 2 A schematic diagram of the piercing mechanism from another perspective is shown.

[0020] Figure 4 It is a schematic diagram of a curved slide groove extending in an arc shape as a whole in a material-piercing mechanism of a sewing machine according to an embodiment of the present invention.

[0021] Figure 5 Schematic diagram of the structure of a sewing machine according to an embodiment of the present invention.

[0022] Figure 6 Schematic diagram of the thread hooking position of the sewing machine according to the embodiment of the present invention.

[0023] The reference numerals are described as follows:

[0024] 1a Eccentric crank 7 Eccentric crank

[0025] 2a Needle bar link 8 Needle bar link

[0026] 3a Needle bar head 9 Eccentric pin

[0027] 4a Sliding block 10 Sliding sleeve

[0028] 5a Slide seat 10′ Slider

[0029] 6a Needle bar 11 Slide seat

[0030] 7a Needle chuck 12 Needle chuck

[0031] 8a Needle 13 Needle

[0032] 9a Stretch needle 13-1 Left needle

[0033] 10a Presser foot 13-2 Middle needle

[0034] 11a Needle plate 13-3 Right needle

[0035] 12a Looper 14 Needle Plate

[0036] 1 Needle bar 15 Looper

[0037] 2 Needle bar head 16 Looper seat

[0038] 3 Rotating link 17 Sliding rod

[0039] 4 Connecting pin 18 Fixing seat

[0040] 5 Rotating pin 19 Looper crank

[0041] 6 curved slide 20 slide bar rack

[0042] 61 Surface segment 21 Connecting axis

[0043] 62 Upper vertical section 22 Ball crank

[0044] 63 lower vertical section 23 ball connecting rod DETAILED DESCRIPTION

[0045] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0046] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0049] like Figures 2 to 4 The figure shows an embodiment of the material-piercing mechanism of the sewing machine provided by the present invention.

[0050] See also Figure 2 and Figure 3 The piercing mechanism of the sewing machine of this embodiment includes: a needle bar 1, a needle bar piercing head 2, a rotating connecting rod 3, a curved slide groove 6, an eccentric crank 7 and a needle bar connecting rod 8.

[0051] The needle bar 1 is vertically arranged in the up-down direction, and a machine needle 13 is installed at the lower end of the needle bar 1. Preferably, a needle chuck 12 is provided at the lower end of the needle bar 1, and a plurality of machine needles 13 are installed on the needle chuck 12. The plurality of machine needles 13 are arranged in a row at intervals, and the needle tips of the plurality of machine needles 13 are arranged in sequence from high to low. When the needle bar 1 moves up and down, the needle chuck 12 and the machine needle 13 are driven to move up and down synchronously.

[0052] The needle bar piercing head 2 is fixedly arranged on the needle bar 1 . Preferably, the needle bar piercing head 2 is fixedly connected to the needle bar 1 at the middle position of the needle bar 1 .

[0053] One end of the rotating connecting rod 3 is hinged to the needle bar piercing head 2 through the connecting pin 4, so that the end of the rotating connecting rod 3 can freely rotate relative to the needle bar piercing head 2 with the connecting pin 4 as the center. The connecting pin 4 is arranged perpendicular to the needle bar 1. Preferably, the connecting pin 4 and the needle bar piercing head 2 are integrated.

[0054] The other end of the rotating connecting rod 3 is provided with a rotating pin 5, and the rotating pin 5 is arranged parallel to the connecting pin 4. Preferably, the rotating pin 5 and the rotating connecting rod 3 are an integral part.

[0055] The curved slide 6 is fixedly arranged, and the curved slide 6 is spaced opposite to the needle bar 1. The curved slide 6 extends from top to bottom and has a curved section 61 extending in an arc shape, so that the curved slide 6 is different from the vertical slide structure that extends vertically in the up and down directions as a whole in the prior art, forming a non-vertical curved slide 6. The rotating pin 5 is slidably matched with the curved slide 6, that is, the rotating pin 5 can be slidably inserted into the curved slide 6 along the curved slide 6. Preferably, the piercing mechanism of the sewing machine of this embodiment also includes a slide seat 11, and the curved slide 6 is arranged on the slide seat 11, and the slide seat 11 is fixed on the housing of the sewing machine, so that the curved slide 6 is fixedly arranged. Preferably, a sliding sleeve 10 is sleeved on the end of the rotating pin 5 away from the rotating connecting rod 3, and the sliding sleeve 10 can be slidably embedded in the curved slide 6 along the curved slide 6, that is, the rotating pin 5 is slidably matched with the curved slide 6 through the sliding sleeve 10. The sliding sleeve 10 is preferably cylindrical.

[0056] The eccentric crank 7 is driven by the upper shaft to rotate around its own center. The upper shaft is driven by the motor to rotate. The center of the eccentric crank 7 (i.e., the center of the circle of the eccentric crank 7) is fixed on the upper shaft, so that the upper shaft drives the eccentric crank 7 to rotate around the center of the eccentric crank 7. The eccentric crank 7 has an eccentric point with an increased eccentricity. The eccentricity of the eccentric point of the eccentric crank 7 refers to the distance between the eccentric point and the center of the eccentric crank 7. The increased eccentricity of the eccentric point of the eccentric crank 7 refers to the increased eccentricity of the eccentric crank 1a of the piercing mechanism using a vertical slide structure that extends vertically in the up-down direction as a whole in the prior art.

[0057] One end of the needle bar connecting rod 8 is hinged to the eccentric point of the eccentric crank 7 through the eccentric pin 9, and the other end of the needle bar connecting rod 8 is hinged to the rotating pin 5. Preferably, one end of the needle bar connecting rod 8 hinged to the rotating pin 5 is between the rotating connecting rod 3 and the curved slide 6. The eccentric pin 9 is arranged parallel to the upper shaft and the rotating pin 5, that is, the upper shaft, the eccentric pin 9, the rotating pin 5 and the connecting pin 4 are parallel to each other. When the eccentric crank 7 rotates, the needle bar connecting rod 8 is driven to move, and when the needle bar connecting rod 8 moves, the rotating pin 5 is driven to slide up and down along the curved slide 6, and the needle bar piercing head 2 is driven to move up and down through the rotating connecting rod 3, thereby driving the needle bar 1 and the machine needle 13 to move up and down.

[0058] The piercing mechanism of the sewing machine of this embodiment designs the curved slide groove 6 as a non-vertical form with a curved surface section 61 extending in an arc shape, and a rotating connecting rod 3 and a rotating pin 5 are added between the curved slide groove 6 and the needle bar piercing head 2. The rotating connecting rod 3 realizes the reversing sliding of the rotating pin 5 in the curved surface section 61 of the curved slide groove 6. The needle bar connecting rod 8 is hinged to the rotating connecting rod 3. Compared with the piercing mechanism of the prior art, the slider 4a on the needle bar piercing head 3a is directly slidably embedded in the vertical slide groove on the slide groove seat 5a. Under the condition that the spindle speed remains unchanged, due to the eccentric curved The eccentricity of the eccentric point of the handle 7 is increased, so that the lifting speed of the needle bar connecting rod 8 is increased, and the curved surface segment 61 of the curved slide 6 is designed to extend in an arc shape, which increases the stroke, thereby maintaining the overall duration of the piercing process unchanged, and at the same time, the acceleration of the movement of the needle 10 can be regulated, thereby breaking the timing characteristics of the construction stitch of the prior art, and achieving the increase of the distance between the upper dead point of the needle 13 and the upper surface of the needle plate 14 while completing the construction stitch, thereby increasing the material discharge space, increasing the maximum thickness of the sewn fabric, and effectively solving the sewing requirements for ultra-thick clothing fabrics. In actual applications, the piercing mechanism of the sewing machine of this embodiment can achieve a maximum increase of 5mm in the distance between the upper dead point of the needle 13 and the upper surface of the needle plate 14 without affecting the construction stitch, thereby doubling the maximum thickness of the sewn fabric.

[0059] In this embodiment, the swing angle of the rotating link 3 is uniquely determined to ensure that there is no shaking or instability during the up and down movement of the machine needle 13. The swing angle of the rotating link 3 is limited by the length and installation angle of the rotating link 3, and the specific swing angle can be specifically designed according to the required movement characteristics of the machine needle 13. Preferably, the maximum swing angle of the rotating link 3 is less than 90°.

[0060] In this embodiment, in order to ensure that the requirements for constructing the stitches are met, preferably, the curved slide 6 also has an upper vertical section 62 and a lower vertical section 63 extending vertically, and the upper vertical section 62, the curved section 61 and the lower vertical section 63 are sequentially connected from top to bottom. As a result, the recovery speed of the needle 13 during the thread hooking process can be slowed down by controlling the curved surface climbing and the curvature of the curved section 61, thereby increasing the thread hooking holding time and ensuring that the constructing stitches are not affected, while the instantaneous speed of the needle 13 in the non-constructing stitch stage and the upper and lower dead points can be increased, which can increase the distance between the needle 13 and the upper surface of the needle plate 14 at the upper dead point.

[0061] The piercing mechanism of the sewing machine of this embodiment is designed with an extension curve of the curved slide 6 from top to bottom according to the requirements of constructing the stitches. By the coordinated action of the rotating pin 5 and the extension curve of the curved slide 6, different downward piercing or recovery accelerations can be provided according to different stages of constructing the stitches, thereby providing different stitch tensions in the stage of non-continuous stitch tension requirements, thereby cooperating with the supply and demand line systems to provide the best stitch tension, so that the stitches can have a suitable degree of tightening, thereby improving the stability of the sewing machine and the adaptability of the clothing fabrics.

[0062] Specifically, in this embodiment, the movement acceleration of the needle 13 is controlled by the curvature of the curved surface segment 61 of the curved slide 6, and the instantaneous speed of the needle 13 in the non-construction stitch stage and the upper and lower dead points is increased, and the suture is kept slightly loose under strong tension. When the needle 13 penetrates the fabric from above, the suture is pressed downward into the fabric part at the penetration point, and the looping thread around the needle 13 pulls down the penetration part of the fabric without excessive tightening, speeding up the needle thread loop generation speed, slowing down the needle thread loop winding speed, maintaining the stability of the needle thread loop, and reducing the occurrence of problems such as skipped stitches and fancy stitches. When the needle 13 is in the stage of being off-thread, the tightening degree of the thread before being off-thread is reduced, and the movement acceleration of the needle 13 is increased to a certain extent after being off-thread, so as to keep a small amount of slack on the thread, so that the thread wound on the needle plate tongue of the needle plate 14 when returning the cloth can be smoothly pulled out from the needle plate tongue, and a small amount of slack can be maintained without being strongly tightened, thereby avoiding quality problems such as half-moon-shaped drop (arching) at the sewing point of the fabric.

[0063] In this embodiment, through the extension curve design of the curved slide groove 6 from top to bottom and the curvature design of the curved segment 61, the time of the needle thread loop generation and holding stage and the bent needle thread loop decoupling stage can also be increased, providing operating space for adjusting the bent needle movement characteristics, which is conducive to the relative stability of the bent needle thread loop action.

[0064] In other embodiments, see Figure 4 , the curved slide 6 can be extended from top to bottom in an arc shape, that is, the extension curve of the curved slide 6 from top to bottom is a circular arc curve, which can reduce the control accuracy of each time period, and only retain the requirements of a certain time period (such as the needle and thread loop and thread removal loop stages of the curved needle hook machine) for design (corresponding to the design of the curved surface section 61). At this time, in order to improve the stability of the piercing mechanism, the cylindrical sliding sleeve 10 on the rotating pin 5 can be replaced with an arc-shaped slider 10' that matches the circular arc curve of the curved slide 6, and the length size and installation angle of the rotating connecting rod 3 can also be adjusted adaptively.

[0065] like Figures 5 and 6 As shown, based on the material piercing mechanism of the sewing machine of the present invention, the embodiment of the present invention further provides a sewing machine. The sewing machine of this embodiment includes the material piercing mechanism of the sewing machine of the present embodiment.

[0066] See also Figure 5 The sewing machine of this embodiment further comprises a needle plate 14, a looper 15 and a looper drive assembly. The needle plate 14 is located below the needle bar 1, and the looper 15 is located below the needle plate 14. The looper drive assembly drives the looper 15 to move and cooperates with the up and down movement of the needle 13 to form the sewing stitch of the sewing machine. The structure of the looper drive assembly can adopt the existing structure, and the size and limit angle of its key components can be adjusted and changed to adapt to the timing characteristics of the construction stitch formed by the above-mentioned piercing mechanism of this embodiment, so as to cooperate with the above-mentioned piercing mechanism to complete the construction stitch.

[0067] Combination Figure 6 In this embodiment, three needles 13 are mounted on the needle chuck 12 at the lower end of the needle bar 1, which are the left needle 13-1, the middle needle 13-2 and the right needle 13-3. The left needle 13-1, the middle needle 13-2 and the right needle 13-3 generate the left needle thread loop C1, the middle needle thread loop C2 and the right needle thread loop C3 respectively. The bending needle 15 is mounted on the front end of the slide bar 17 through the bending needle seat 16, and the sliding rod 17 drives the bending needle 15 to move synchronously. The movement of the sliding rod 17 is a composite movement composed of the left and right movement provided by the fixed seat 18 on the sliding rod 17 and the bending needle crank 19, and the forward and backward swing provided by the sliding rod frame 20 connected to the sliding rod 17. Among them, the acceleration of the left and right movement provided by the bending needle crank 19 is determined by the change of the angle between the axis of the connecting shaft 21 and the horizontal plane, and the length of the bending needle crank 19 is the radius. In this embodiment, the instantaneous speed of the bending needle 15 passing through the left needle thread loop C1 / middle needle thread loop C2 / right needle thread loop C3 is set in the fastest range, and the instantaneous speed of the bending needle 15 moving to the right and taking off the left needle thread loop C1 / middle needle thread loop C2 / right needle thread loop C3 is set in the second fastest range. The angle change of the forward and backward swing provided by the slide rod frame 20 is affected by the matching angle of the ball crank 22 and the ball connecting rod 23. When the needle 13 is at the top dead center, by changing the spatial angle of the ball crank 22 and the ball connecting rod 23 and the position of the bending needle 15, the swing angle change of the bending needle 15 passing through the left needle thread loop C1 / middle needle thread loop C2 / right needle thread loop C3 is adjusted to the minimum, thereby achieving relative stability of the left needle thread loop C1 / middle needle thread loop C2 / right needle thread loop C3 in the stage of the bending needle 15 hooking the needle thread loop.

[0068] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A material-piercing mechanism for a sewing machine, characterized in that: include: The needle bar (1) is vertically arranged in the up-down direction and has a machine needle (13) mounted on the lower end; A needle bar piercing head (2) is fixedly mounted on the needle bar (1); A rotating connecting rod (3), one end of which is hinged to the needle bar piercing head (2) via a connecting pin (4) perpendicular to the needle bar (1), and the other end of which is provided with a rotating pin (5); A curved slide groove (6) is fixedly arranged and spaced opposite to the needle bar (1), the curved slide groove (6) extends from top to bottom and has a curved segment (61) extending in an arc shape, the rotating pin shaft (5) is slidably matched with the curved slide groove (6); an eccentric crank (7) is driven by the upper shaft to rotate around its own center, and the eccentric crank (7) has an eccentric point arranged to increase the eccentricity; A needle bar connecting rod (8), one end of which is hinged to the eccentric point of the eccentric crank (7) through an eccentric pin shaft (9), and the other end of which is hinged to the rotating pin shaft (5); The upper shaft, the eccentric pin shaft (9), the rotating pin shaft (5) and the connecting pin shaft (4) are parallel to each other.

2. The material-piercing mechanism of a sewing machine according to claim 1, characterized in that: The curved surface slide groove (6) also has an upper vertical section (62) and a lower vertical section (63) extending vertically, and the upper vertical section (62), the curved surface section (61) and the lower vertical section (63) are connected in sequence from top to bottom.

3. The material-piercing mechanism of a sewing machine according to claim 1, characterized in that: The curved sliding groove (6) extends in an arc shape from top to bottom as a whole.

4. The material-piercing mechanism of a sewing machine according to claim 1, characterized in that: A sliding sleeve (10) is sleeved on one end of the rotating pin (5) away from the rotating connecting rod (3), and the sliding sleeve (10) can be slidably embedded in the curved sliding groove (6) along the curved sliding groove (6).

5. The material-piercing mechanism of a sewing machine according to claim 1, characterized in that: The maximum swing angle of the rotating connecting rod (3) is less than 90°.

6. The material-piercing mechanism of a sewing machine according to claim 1, characterized in that: It also comprises a slide groove seat (11), the curved slide groove (6) is arranged on the slide groove seat (11), and the slide groove seat (11) is fixed on the casing of the sewing machine.

7. The material-piercing mechanism of a sewing machine according to claim 1, characterized in that: A needle clamp (12) is provided at the lower end of the needle bar (1), and a plurality of machine needles (13) are mounted on the needle clamp (12). The plurality of machine needles (13) are arranged in a row at intervals, and the needle tips of the plurality of machine needles (13) are arranged in sequence from high to low.

8. A sewing machine, characterized in that: A material-piercing mechanism for a sewing machine comprising the material-piercing mechanism as claimed in any one of claims 1 to 7.

9. The sewing machine according to claim 8, characterized in that It also includes a needle plate (14), a curved needle (15) and a curved needle drive assembly, wherein the needle plate (14) is located below the needle bar (1), and the curved needle (15) is located below the needle plate (14); the curved needle drive assembly drives the curved needle (15) to move and cooperates with the up and down movement of the machine needle (13) to form the sewing stitch of the sewing machine.

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