Stitching mechanism of sewing machine and sewing machine

Abstract

The present application relates to sewing machine technical field, especially to a kind of material of sewing machine and a kind of sewing machine comprising the material of sewing machine.The material of sewing machine includes: needle bar, vertically arranged along up and down direction and lower end is equipped with needle;Needle bar head, fixedly arranged on needle bar;Rotary connecting rod, one end is hinged with needle bar head by the connecting pin shaft perpendicular to needle bar, and the other end is provided with rotating pin shaft;Curved surface sliding groove, fixedly arranged and spaced from needle bar, curved surface sliding groove extends from top to bottom and has curved surface section extending in arc shape, rotating pin shaft and curved surface sliding groove slidingly cooperate;Eccentric crank, driven by upper shaft to rotate around its center, eccentric crank has eccentric point with eccentricity increasing arrangement;Needle bar connecting rod, one end is hinged on the eccentric point position of eccentric crank by eccentric pin shaft, and the other end is hinged on rotating pin shaft;Upper shaft, eccentric pin shaft, rotating pin shaft and connecting pin shaft are parallel to each other.The distance of needle to the upper surface of needle plate at top dead center can be improved.

Description

Technical Field

[0001] This invention relates to the field of sewing machine technology, and more particularly to a material-feeding mechanism for a sewing machine and a sewing machine including the material-feeding mechanism. Background Technology

[0002] like Figure 1 As shown, in the conventional sewing machine needle insertion mechanism of the prior art, the upper shaft drives the eccentric crank 1a to rotate 360° around the center of the eccentric crank 1a. The eccentric crank 1a has an eccentric point with an eccentric distance between it and the center of the eccentric crank 1a. The position of the eccentric point 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 head 3a and is located between the slide seat 5a and the needle bar 6a. One end of the needle bar head 3a is fixed at the middle position of the needle bar 6a. The other end of the needle bar head 3a is fitted with a rectangular slider 4a. The slide seat 5a has a vertical slide groove parallel to the needle bar 6a. The slider 4a on the needle bar head 3a can slide up and down and is embedded in the vertical slide groove on the slide seat 5a. Thus, the upper shaft drives the eccentric crank 1a to drive the needle bar 6a to move up and down in the vertical direction. A needle chuck 7a is installed at the lower end of the needle bar 6a, and a machine needle 8a is mounted on the needle chuck 7a. The machine needle 8a is located above the needle plate 11a, and a curved needle 12a is located below the needle plate 11a. The curved needle 12a is driven by a curved needle drive mechanism and works in conjunction with the up-and-down movement of the machine needle 8a to hook the thread. Based on the working relationship between the machine needle 8a and the curved needle 12a during thread hooking, the distance between the upper stop point of the machine needle 8a (i.e., the highest point where the machine needle 8a rises above the needle plate 11a) and the upper surface of the needle plate 11a is typically less than 10mm. To achieve the sewing process, a tensioning needle 9a and a presser foot 10a are provided between the needle chuck 7a and the needle plate 11a. The height of the presser foot 10a is limited by the height of the upper stop point of the machine needle 8a, making it difficult to meet customer needs for sewing ultra-thick garment fabrics.

[0003] Furthermore, in the aforementioned conventional needle-punching mechanism, the changing trends of the needle 8a's downward and upward movements are structurally limited. The speed variation pattern of the needle 8a's downward punting movement is acceleration-deceleration-acceleration, and vice versa for upward movement. During the stitch construction stages, such as the looper 12a removing the thread loop, generating the thread loop, the looper 12a hooking the thread loop, and several tightening of the thread, it is difficult to find the optimal speed range (sewing tension) within the relatively simple needle 8a movement pattern to maintain the stitch without slack and with appropriate tightness. This restricts the higher requirements of sewing processes for new fabrics and limits the sewing machine's adaptability to various garment 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 needle insertion mechanism for a sewing machine that can increase the distance between the needle at the upper stop point and the upper surface of the needle plate.

[0005] To solve the above technical problems, the present application adopts the following technical solutions:

[0006] The present application provides a sewing machine's material piercing mechanism, comprising: a needle bar vertically arranged along the up-down direction and having a needle fixed at the lower end; a needle bar head fixed on the needle bar; a rotating connecting rod hingedly connected to the needle bar head through a connecting pin shaft perpendicular to the needle bar at one end and having a rotating pin shaft at the other end; a curved slide groove fixedly arranged and spaced opposite to the needle bar, the curved slide groove extending from top to bottom and having a curved section extending in an arc shape, the rotating pin shaft slidingly fitted with the curved slide groove; an eccentric crank driven by an upper shaft to rotate around its center, the eccentric crank having an eccentric point with an increased eccentricity; a needle bar connecting rod hingedly connected at one end to the eccentric point of the eccentric crank and hingedly connected at the other end to the rotating pin shaft; the upper shaft, the eccentric pin shaft, the rotating pin shaft and the connecting pin shaft being parallel to each other.

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

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

[0009] Preferably, a sliding sleeve is sleeved on the end of the rotating pin shaft away from the rotating connecting rod, the sliding sleeve being slidingly embedded in the curved slide groove.

[0010] Preferably, the maximum swing angle of the rotating connecting rod is less than 90°.

[0011] Preferably, the curved slide groove is arranged on a slide groove seat, and the slide groove seat is fixedly arranged on the housing of the sewing machine.

[0012] Preferably, the lower end of the needle bar is provided with a needle clamp head, a plurality of needles are arranged on the needle clamp head, the plurality of needles are arranged in a row in a spaced manner, and the needle tips of the plurality of needles are arranged from high to low in sequence.

[0013] The present application also provides a sewing machine comprising the sewing machine's material piercing mechanism as described above.

[0014] Preferably, the sewing machine further comprises a needle plate, a curved needle and a curved needle driving assembly, the needle plate is located below the needle bar, the curved needle is located below the needle plate, and the curved needle driving assembly drives the curved needle to move and cooperates with the up-down movement of the needle to form a sewing stitch of the sewing machine.

[0015] Compared with the prior art, the present application has the following advantages:

[0016] The sewing machine's needling mechanism of the present application, the curved slide is designed as a non-vertical form with an arc-shaped extending curved section, a rotating connecting rod and a rotating pin shaft are additionally arranged between the curved slide and the needle bar head, the rotating connecting rod is used to realize the reversing sliding of the rotating pin shaft in the curved section of the curved slide, the needle bar connecting rod is hinged with the rotating connecting rod, compared with the prior art's needling mechanism which uses the way that the slider on the needle bar head is directly embedded in the vertical slide in the slide seat, under the condition that the main shaft speed is unchanged, the needle bar connecting rod's lifting speed is increased due to the eccentricity increase of the eccentric point of the eccentric crank, and the curved section of the curved slide is designed as an arc-shaped extension, which increases the stroke, so that the overall length of the needling process can be kept unchanged, and the acceleration of the needle movement can be controlled, thereby breaking the time sequence characteristics of the constructed stitch in the prior art, and increasing the distance between the needle and the upper surface of the needle plate at the top dead center, thereby increasing the needling space and the maximum thickness of the fabric that can be sewn, effectively solving the needling requirement of the super-thick garment fabric. BRIEF DESCRIPTION OF DRAWINGS

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

[0018] Figure 2 is a structural schematic diagram of the sewing machine's needling mechanism of the embodiment of the present application.

[0019] Figure 3 is Figure 2 is a schematic diagram of another view of the needling mechanism.

[0020] Figure 4 is a schematic diagram of the needling mechanism of the sewing machine of the embodiment of the present application, when the curved slide as a whole extends in an arc shape.

[0021] Figure 5 is a structural schematic diagram of the sewing machine of the embodiment of the present application.

[0022] Figure 6 is a schematic diagram of the hooking position of the sewing machine of the embodiment of the present application.

[0023] Among them, the reference signs are explained as follows:

[0024] 1a eccentric crank 7 eccentric crank

[0025] 2a needle bar connecting rod 8 needle bar connecting rod

[0026] 3a needle bar head 9 eccentric pin shaft

[0027] 4a slider 10 slide sleeve

[0028] 5a slide seat 10' slider

[0029] 6a needle bar 11 slide groove seat

[0030] 7a needle clamp head 12 needle clamp head

[0031] 8a machine needle 13 machine needle

[0032] 9a needle 13-1 left machine needle

[0033] 10a presser foot 13-2 middle machine needle

[0034] 11a needle plate 13-3 right machine needle

[0035] 12a curved needle 14 needle plate

[0036] 1 needle bar 15 curved needle

[0037] 2 needle bar clamp head 16 curved needle seat

[0038] 3 rotating connecting rod 17 slide bar

[0039] 4 connecting pin shaft 18 fixed seat

[0040] 5 rotating pin shaft 19 curved needle crank

[0041] 6 curved surface slide groove 20 slide bar frame

[0042] 61 curved surface section 21 connecting shaft

[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 application will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate the present application, and are not limiting to the present application.

[0046] In the description of the present application, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" are only for description purposes, and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] In addition, in the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0049] As shown in Figures 2 to 4 , an embodiment of the needle mechanism of the sewing machine provided by the present application is provided.

[0050] Referring to Figure 2 and Figure 3 , the needle mechanism of the sewing machine of the embodiment comprises a needle bar 1, a needle bar head 2, a rotating connecting rod 3, a curved sliding 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 the lower end of the needle bar 1 is provided with a needle clamp head 12. Preferably, the lower end of the needle bar 1 is provided with a needle clamp head 12, and a plurality of needles 13 are arranged on the needle clamp head 12. The plurality of needles 13 are arranged in a row with a certain interval, and the needle tips of the plurality of needles 13 are arranged from high to low. The needle bar 1 moves up and down, driving the needle clamp head 12 and the needles 13 to move up and down synchronously.

[0052] The needle bar head 2 is fixedly arranged on the needle bar 1. Preferably, the needle bar 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 hingedly connected to the needle bar head 2 through a connecting pin shaft 4, so that the end of the rotating connecting rod 3 can freely rotate relative to the needle bar head 2 with the connecting pin shaft 4 as the center. The connecting pin shaft 4 is perpendicular to the needle bar 1. Preferably, the connecting pin shaft 4 and the needle bar head 2 are an integral part.

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

[0055] The curved slide groove 6 is fixedly arranged and opposite to the needle bar 1, and extends from top to bottom and has a curved section 61 extending in an arc shape, so that the curved slide groove 6 is different from the vertical slide groove structure in the prior art which extends vertically in the up-down direction, and forms a curved slide groove 6 in a non-vertical form. The rotating pin shaft 5 is in sliding fit with the curved slide groove 6, that is, the rotating pin shaft 5 is slidably arranged in the curved slide groove 6. Preferably, the sewing machine of the embodiment further 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 fixedly arranged on the machine shell of the sewing machine, so that the curved slide groove 6 is fixedly arranged. Preferably, a sliding sleeve 10 is sleeved on one end of the rotating pin shaft 5 away from the rotating link 3, and the sliding sleeve 10 is slidably arranged in the curved slide groove 6, that is, the rotating pin shaft 5 is in sliding fit with the curved slide groove 6 through the sliding sleeve 10. The sliding sleeve 10 is preferably cylindrical.

[0056] The eccentric crank 7 is driven to rotate around the center thereof by the upper shaft, and the center of the eccentric crank 7, that is, the center of the eccentric crank 7, is fixedly arranged on the upper shaft, so that the eccentric crank 7 is driven to rotate around the center of the eccentric crank 7 by the upper shaft. The eccentric crank 7 has an eccentric point with an increased eccentric distance, and the eccentric distance 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, and the eccentric distance of the eccentric point of the eccentric crank 7 is increased compared with the eccentric distance of the eccentric crank 1a of the needle bar mechanism with the vertical slide groove structure extending vertically in the up-down direction in the prior art.

[0057] One end of the needle bar link 8 is hingedly connected to the eccentric point position of the eccentric crank 7 through the eccentric pin shaft 9, and the other end of the needle bar link 8 is hingedly connected to the rotating pin shaft 5. Preferably, the end of the needle bar link 8 hingedly connected to the rotating pin shaft 5 is between the rotating link 3 and the curved slide groove 6. The eccentric pin shaft 9 is arranged in parallel with the upper shaft and the rotating pin shaft 5, that is, the upper shaft, the eccentric pin shaft 9, the rotating pin shaft 5 and the connecting pin shaft 4 are parallel to each other. The eccentric crank 7 drives the needle bar link 8 to move when the eccentric crank 7 rotates, the needle bar link 8 drives the rotating pin shaft 5 to slide up and down along the curved slide groove 6 when the needle bar link 8 moves, and drives the needle bar 1 and the needle 13 to move up and down through the rotating link 3.

[0058] The stitching mechanism of the sewing machine of the embodiment has the curved surface sliding groove 6 designed as a non-vertical form with the curved surface section 61 extending in an arc shape, and the rotating connecting rod 3 and the rotating pin shaft 5 are additionally arranged between the curved surface sliding groove 6 and the needle bar needle head 2. The rotating connecting rod 3 is used to realize the reversing sliding of the rotating pin shaft 5 in the curved surface section 61 of the curved surface sliding groove 6. The needle bar connecting rod 8 is hinged with the rotating connecting rod 3. Compared with the prior art stitching mechanism which uses the slider 4a on the needle bar needle head 3a to be directly embedded in the vertical sliding groove of the sliding groove seat 5a in a vertically sliding manner, the eccentricity of the eccentric point of the eccentric crank 7 is increased to increase the lifting speed of the needle bar connecting rod 8, and the curved surface section 61 of the curved surface sliding groove 6 extending in an arc shape is designed to increase the stroke, so that the overall time of the stitching process can be kept unchanged, and the acceleration of the needle 10 can be controlled. Therefore, the time sequence characteristics of the stitch of the prior art can be broken, the distance between the needle 13 and the upper surface of the needle plate 14 at the top dead center can be increased, the space for feeding the material can be increased, the maximum thickness of the fabric that can be sewn can be increased, and the sewing demand for the super-thick garment fabric can be effectively solved. In actual application, the stitching mechanism of the sewing machine of the embodiment can increase the distance between the needle 13 and the upper surface of the needle plate 14 at the top dead center by 5 mm without affecting the stitch, so that the maximum thickness of the fabric that can be sewn is doubled.

[0059] In the embodiment, the swing angle of the rotating connecting rod 3 is uniquely determined to ensure that the needle 13 does not shake or become unstable during the up-and-down movement. The swing angle of the rotating connecting rod 3 is limited by the length and installation angle of the rotating connecting rod 3, and the specific swing angle can be designed according to the movement characteristics required by the needle 13. Preferably, the maximum swing angle of the rotating connecting rod 3 is less than 90°.

[0060] In the embodiment, to ensure that the stitch requirement is met, preferably, the curved surface sliding 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. Therefore, the lifting speed of the needle 13 during the stitch can be slowed down through the control of the curved surface climbing and the curved surface curvature of the curved surface section 61, so as to increase the stitch holding time and ensure that the stitch is not affected. The instantaneous speed of the needle 13 at the non-stitch stage and the top and bottom dead centers can be increased, so as to increase the distance between the needle 13 and the upper surface of the needle plate 14 at the top dead center.

[0061] The thread feeding mechanism of the sewing machine of the embodiment can provide different downward feeding or upward feeding accelerations according to different thread construction stages, so as to provide different thread tension in the non-continuous thread tension stage, and thus provide the best thread tension in cooperation with the thread supply and demand system, so that the thread can have a proper tension, and the stability of the sewing machine and the adaptability of the fabric are improved.

[0062] Specifically, in the embodiment, the acceleration of the needle 13 is controlled by the curvature of the curved section 61 of the curved slide groove 6, and the instantaneous speed of the needle 13 at the non-thread construction stage and the upper and lower dead points is increased, and the thread is kept slightly loose under the condition of being strongly pulled. When the needle 13 penetrates the fabric from the top, the thread is pressed into the fabric part of the penetration from the bottom, and the looped thread around the needle 13 pulls the penetration part of the fabric, which will not be excessively tight, and the speed of the needle loop generation is accelerated, the speed of the needle loop collection is slowed down, the stability of the needle loop is maintained, and the problems such as needle skipping and needle skipping are reduced. When the needle 13 is in the thread removal stage, the tension of the thread before thread removal is reduced, and a certain acceleration of the needle 13 is increased after thread removal, so that the thread can be smoothly pulled out of the needle plate tongue, and the thread can be kept slightly loose under the condition of not being strongly pulled, so as to avoid the quality problems such as half-moon-shaped lifting (arch) of the sewing part of the fabric.

[0063] In the embodiment, the extension curve of the curved slide groove 6 from top to bottom and the curvature of the curved section 61 can also increase the time of the needle loop generation and maintenance stage and the needle bending thread removal stage, provide operation space for adjusting the needle bending movement characteristics, and be conducive to the relative stability of the needle bending hooking needle loop action.

[0064] In other embodiments, referring to Figure 4 , the curved slide groove 6 can extend in an arc shape from top to bottom, that is, the extension curve of the curved slide groove 6 from top to bottom is a circular arc curve, the control accuracy of each time period can be reduced, and only a certain time period requirement (such as the needle bending hooking needle loop and thread removal stage) is designed (corresponding to the curved section 61 design). At this time, in order to improve the stability of the thread feeding mechanism, the cylindrical sleeve 10 on the rotating pin shaft 5 can be replaced by an arc-shaped sliding block 10' matched with the circular arc curve of the curved slide groove 6, and the length size and installation angle of the rotating connecting rod 3 also have adaptive adjustment changes.

[0065] As shown in Figures 5 to 6 , based on the thread feeding mechanism of the sewing machine of the application, the application also provides a sewing machine. The sewing machine of the embodiment includes the thread feeding mechanism of the sewing machine described above in the embodiment.

[0066] Referring toFigure 5 The sewing machine of the embodiment further comprises a needle plate 14, a hook 15 and a hook driving assembly. The needle plate 14 is located below the needle bar 1, the hook 15 is located below the needle plate 14, and the hook driving assembly drives the hook 15 to move and cooperates with the up-and-down movement of the needle 13 to form a sewing stitch of the sewing machine. The structure of the hook driving assembly can adopt the existing structure, and the key component size and the limiting angle can be adjusted and changed to adapt to the timing characteristics of the construction stitch formed by the above-described material piercing mechanism, so as to complete the construction stitch in cooperation with the above-described material piercing mechanism.

[0067] In combination with Figure 6 In the embodiment, three needles 13 are arranged on the needle clamp head 12 at the lower end of the needle bar 1, which are a left needle 13-1, a middle needle 13-2 and a right needle 13-3 in sequence. The left needle 13-1, the middle needle 13-2 and the right needle 13-3 generate a left needle loop C1, a middle needle loop C2 and a right needle loop C3, respectively. The hook 15 is installed at the front end of the slide bar 17 through the hook seat 16 and is driven by the slide bar 17 to move synchronously. The movement of the slide bar 17 is a composite movement composed of the left-and-right movement provided by the fixed seat 18 arranged on the slide bar 17 and the front-and-back swing provided by the slide bar frame 20 connected to the slide bar 17. The acceleration of the left-and-right movement provided by the hook 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 hook crank 19 is the radius. In the embodiment, the instantaneous speed of the hook 15 in the stage of passing through the left needle loop C1 / middle needle loop C2 / right needle loop C3 is set in the fastest interval, and the instantaneous speed of the hook 15 in the stage of moving to the right to remove the left needle loop C1 / middle needle loop C2 / right needle loop C3 is set in the second fastest interval. The angle change of the front-and-back swing provided by the slide bar frame 20 is affected by the cooperation angle of the ball crank 22 and the ball connecting rod 23. When the needle 13 is at the top dead center, the angle change amount of the swing of the hook 15 in the stage of passing through the left needle loop C1 / middle needle loop C2 / right needle loop C3 is adjusted to the minimum by changing the spatial angle of the ball crank 22 and the ball connecting rod 23 and the position of the hook 15, so as to realize the relative stability of the left needle loop C1 / middle needle loop C2 / right needle loop C3 in the stage of hooking the needle loop of the hook 15.

[0068] The above only describes the preferred embodiments of the present application. It should be noted that those skilled in the art can make several improvements and replacements without departing from the technical principles of the present application, and these improvements and replacements should also be considered as the protection scope of the present application.

Claims

1. A feeding mechanism for a sewing machine, characterized in that, include: The needle bar (1) is vertically arranged in the up-down direction and the lower end is equipped with a needle (13). The needle bar head (2) is fixed on the needle bar (1); The rotating connecting rod (3) is hinged at one end to the needle bar head (2) via a connecting pin (4) perpendicular to the needle bar (1), and the other end is provided with a rotating pin (5). A curved slide groove (6) is fixedly installed and spaced apart from the needle bar (1). The curved slide groove (6) extends from top to bottom and has an arc-shaped curved section (61). The rotating pin (5) slides in cooperation with the curved slide groove (6). An eccentric crank (7) is driven by an upper shaft to rotate around its own center. The eccentric crank (7) has an eccentric point with an increased eccentricity. The needle bar connecting rod (8) is hinged at one end to the eccentric point of the eccentric crank (7) via an eccentric pin (9), and the other end is hinged to the rotating pin (5). The upper shaft, the eccentric pin (9), the rotating pin (5), and the connecting pin (4) are parallel to each other; 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 connected from top to bottom in sequence; With the spindle speed unchanged, the eccentricity of the eccentric point of the eccentric crank (7) is increased, which increases the lifting speed of the needle bar connecting rod (8). The curved surface groove (6) is designed with an arc-shaped extended curved surface section, which increases the stroke. Therefore, the overall time of the piercing process can be kept unchanged. At the same time, the distance between the upper stop point of the needle (13) and the upper surface of the needle plate is increased, which increases the feeding space.

2. The feeding mechanism of the sewing machine according to claim 1, characterized in that, A sliding sleeve (10) is fitted on one end of the rotating pin (5) away from the rotating connecting rod (3). The sliding sleeve (10) can be slidably embedded in the curved sliding groove (6) along the curved sliding groove (6).

3. The feeding mechanism of the sewing machine according to claim 1, characterized in that, The maximum swing angle of the rotating link (3) is less than 90°.

4. The feeding mechanism of the sewing machine according to claim 1, characterized in that, It also includes a slide seat (11), the curved slide (6) is provided on the slide seat (11), and the slide seat (11) is fixed on the housing of the sewing machine.

5. The feeding mechanism of the sewing machine according to claim 1, characterized in that, The lower end of the needle bar (1) is provided with a needle clamp (12), and multiple needles (13) are mounted on the needle clamp (12). The multiple needles (13) are arranged in a row at intervals, and the needle tips of the multiple needles (13) are arranged in order from high to low.

6. A sewing machine, characterized in that, Includes the feeding mechanism of a sewing machine as described in any one of claims 1 to 5.

7. The sewing machine according to claim 6, characterized in that, It also includes a needle plate (14), a curved needle (15) and a curved needle drive assembly. 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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