Sewing machine and needling mechanism thereof

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 needling mechanism comprises a needle rod, a needle rod and a needle rod, the needle bar pricking head is fixedly arranged on the needle bar, and a pricking head shaft perpendicular to the needle bar extends on the needle bar pricking head; the sliding groove is fixedly arranged and is parallel to the needle rod, and the pricking head shaft is in sliding fit with the sliding groove; the needle bar crank is fixedly arranged on an upper shaft which is driven to rotate; one end of the needle rod connecting rod is hinged to the needle rod crank through a connecting rod shaft; one end of the small connecting rod is hinged to the binding head shaft; one end of the delay connecting rod is hinged to the fixed fulcrum through a connecting shaft; the other end of the needle rod connecting rod, the other end of the small connecting rod and the other end of the delay connecting rod are mutually hinged through connecting pins; the upper shaft, the connecting rod shaft, the connecting pin, the connecting shaft and the binding head shaft are parallel to one another. The needle punching material depth can be reduced, and fabric damage caused by a needle is improved; the height of the highest point of needle recovery is increased, and the discharging space is 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] The needle piercing process of the sewing machine is as follows: Figure 1-1 to Figure 1-4 As shown, multiple needles 100 are arranged side by side, for example, three needles. After the needle tips of a row of needles 100 are inserted into place below the needle plate 200, the curved needle 300 located below the needle plate 200 starts to move horizontally and passes through each needle 100 in turn to hook the thread. At the same time, the needle 100 starts to rise, and the sewing line is formed by the horizontal movement of the curved needle 300 and the up and down movement of the needle 100.

[0003] like Figure 1-1 The figure shows the state when the needle 100 pierces the material to the deepest point. At this time, the distance between the needle tip of the needle 100 and the upper surface of the needle plate 200 is recorded as a. The deeper the needle tip of the needle 100 penetrates, the larger the dimension a is, and the easier it is for the needle handle of the needle 100 (the thick part on the upper part of the needle 100) to penetrate the fabric and damage the fabric fiber. Therefore, a smaller dimension a is desired.

[0004] like Figure 1-2 The figure shows the state when the needle 100 moves to the highest point. At this time, the distance between the needle tip of the needle 100 and the upper surface of the needle plate 200 is b. The higher the needle 100 can move, the larger the dimension b is, and the larger the material discharge space between the needle tip of the needle 100 and the upper surface of the needle plate 200 is, which can accommodate thicker fabrics. Therefore, a larger dimension b is desired.

[0005] like Figure 1-3 As shown in the figure, the curved needle 300 passes the first machine needle 100 and starts to hook the thread. At this time, the distance between the tip of the curved needle 300 and the tip of the first machine needle 100 is recorded as c. In this state, the machine needle 200 starts to rise, and the curved needle 300 moves horizontally from left to right along the direction shown in the figure and passes through each machine needle 100 in turn to hook the thread. Figure 1-4 As shown in the figure, the state of the curved needle 300 passing through the third machine needle 100, at this time, the distance between the tip of the curved needle 300 and the tip of the third machine needle 100 is also recorded as c. The dimension c is the minimum value to ensure that the curved needle 300 can normally hook the thread. When the curved needle 300 passes through each machine needle 100, the distance between the tip of the curved needle 300 and the tip of the corresponding machine needle 100 must be ≥ c to ensure that the curved needle 300 can normally hook the thread.

[0006] At present, the piercing mechanism of the sewing machine usually adopts a conventional crank slider mechanism. The speed of the needle 100 rising from the lowest point is related to the driving radius of the needle bar crank. If the dimension a is to be reduced while ensuring the dimension c, the speed of the needle 100 rising needs to be slowed down. The conventional crank slider mechanism can only reduce the driving radius, but this will also reduce the dimension b, reducing the material discharge space between the needle tip of the needle 100 and the upper surface of the needle plate 200. The conventional crank slider mechanism cannot reduce the dimension a while ensuring that the dimension b remains unchanged or increases the dimension b.

[0007] As a result, the current sewing machines have major defects in sewing thick materials. During the process of needle 100 piercing the material, when needle 100 pierces to the lowest point, the needle handle pierces the fabric due to the material being pierced too deeply, resulting in large pinholes on the fabric, which can easily damage the fabric. If needle 100 is raised, the bent needle 300 will not be able to hook the thread loop of needle 100, resulting in skipped stitches. When needle 100 rises to the highest point, the height of needle 100 is not enough, which will affect the height of the presser foot. Usually, the bottom surface of the presser foot does not exceed the needle tip of needle 100, and the height of the presser foot directly affects the thickness of the fabric that can be sewn. Therefore, the maximum height of needle 100 rises determines the thickness of the fabric that can be sewn. If the distance between the needle tip of needle 100 and the upper surface of needle plate 200 is insufficient, thicker fabrics cannot be inserted.

[0008] The invention patent application with publication number CN117468181A discloses a sewing machine, which swaps the positions of the cam member and the guide rail, which can, to a certain extent, achieve an upstroke distance greater than the downstroke distance and reduce the needle recovery speed, but the ultimate effect is limited. After making such a structural change, the original head shape of the sewing machine is completely changed, which increases the difficulty of the production process and significantly reduces the aesthetics. Summary of the invention

[0009] 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 reduce the speed of the needle rising back during the process of the curved needle hooking the thread, thereby ensuring that the curved needle hooks the thread normally, and at the same time reduce the depth of the lowest point of the needle and increase the height of the highest point of the needle rising back.

[0010] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0011] The present invention provides a material-piercing mechanism of a sewing machine, comprising: a needle bar equipped with a machine needle; a needle bar piercing head fixedly arranged on the needle bar, a piercing head shaft extending from the needle bar piercing head and perpendicular to the needle bar; a slide groove fixedly arranged and parallel to the needle bar, the piercing head shaft and the slide groove slidingly cooperate; a needle bar crank fixedly arranged on an upper shaft driven to rotate; a needle bar connecting rod, one end of which is hinged to the needle bar crank through a connecting rod shaft; a small connecting rod, one end of which is hinged to the piercing head shaft; a delay connecting rod, one end of which is hinged to a fixed fulcrum through a connecting shaft; the other end of the needle bar connecting rod, the other end of the small connecting rod and the other end of the delay connecting rod are hinged to each other through a connecting pin; the upper shaft, the connecting rod shaft, the connecting pin, the connecting shaft and the piercing head shaft are parallel to each other.

[0012] Preferably, it also includes a sliding base, the slide groove is arranged on the sliding base, and the sliding base is fixed on the casing of the sewing machine.

[0013] Preferably, the fixed fulcrum is a sliding base.

[0014] Preferably, the fixed fulcrum is a casing of the sewing machine.

[0015] Preferably, a sliding block is provided on one end of the tying head shaft away from the needle rod, and the sliding block is slidably arranged in the sliding groove.

[0016] Preferably, a stopper is provided on the tying head shaft, and the stopper is located on a side of the slide block close to the needle rod and is clamped on the outer side of the slide groove.

[0017] Preferably, a needle cob is provided at the lower end of the needle bar, and a plurality of machine needles are mounted on the needle cob. 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.

[0018] 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.

[0019] The present invention also provides a sewing machine, comprising the material-piercing mechanism of the sewing machine as described above.

[0020] Compared with the prior art, the present invention has significant improvements:

[0021] The piercing mechanism of the sewing machine of the present invention is provided with a connecting pin, a small connecting rod and a delay connecting rod between the needle bar connecting rod and the piercing head shaft of the needle bar piercing head, so that the needle recovery speed in the process of the curved needle hooking the thread is reduced under the action of the delay connecting rod. Therefore, it is not necessary to reduce the radius of the needle bar crank to ensure that the curved needle hooks the thread normally, while reducing the depth of the lowest point of the needle and increasing the height of the highest point of the needle recovery, so that when the needle is lowered to the lowest point, it is higher than that of the existing conventional piercing mechanism, that is, the needle does not need to penetrate deeply into the fabric when piercing the material, thereby ensuring that the fabric is not damaged by the needle. At the same time, when the needle is recovered to the highest point, it is higher than that of the conventional piercing mechanism, that is, when the needle is recovered to the highest point, there is enough distance between the needle tip and the upper surface of the needle plate for material release, thereby being able to sew thicker fabrics. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1-1 This is a schematic diagram of the state when the sewing machine needle pierces the material to the deepest point during the process.

[0023] Figure 1-2 This is a schematic diagram of the state when the sewing machine needle moves to the highest point during the process of piercing the material.

[0024] Figure 1-3 This is a schematic diagram of the state in which the curved needle passes through the first needle and starts to hook the thread during the sewing machine needle piercing the material.

[0025] Figure 1-4 This is a schematic diagram of the state when the bent needle passes through the third needle during the sewing machine needle piercing the material.

[0026] 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.

[0027] Figure 3 yes Figure 2 Enlarged schematic diagram of part A in the middle.

[0028] Figure 4 yes Figure 2 Schematic diagram of part A from another angle.

[0029] Figure 5 It is a schematic diagram of the relationship between the needle tip height and the upper shaft rotation angle during the piercing process of the piercing mechanism of the sewing machine according to an embodiment of the present invention.

[0030] The reference numerals are described as follows:

[0031] 100 Needles

[0032] 200 Needle Plate

[0033] 300 Curved needle

[0034] 400 Looper Drive Assembly

[0035] 1 Needle bar

[0036] 2 Needle bar head

[0037] 3. Tie head shaft

[0038] 4 Chutes

[0039] 5 Needle bar crank

[0040] 6 Upper shaft

[0041] 7 Needle bar connecting rod

[0042] 8 Connecting rod shaft

[0043] 9 Small connecting rod

[0044] 10 Delay Link

[0045] 11 Connecting shaft

[0046] 12 Connecting pin

[0047] 13 Sliding base

[0048] 14 Sliders

[0049] 15 Stopper

[0050] 16-pin cobalt DETAILED DESCRIPTION

[0051] 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.

[0052] 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.

[0053] 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.

[0054] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0055] like Figures 2 to 5 The figure shows an embodiment of the material-piercing mechanism of the sewing machine provided by the present invention.

[0056] See also Figure 2 and Figure 4 The piercing mechanism of the sewing machine of this embodiment includes: a needle bar 1, a needle bar piercing head 2, a piercing head shaft 3, a slide groove 4, a needle bar crank 5, an upper shaft 6, a needle bar connecting rod 7, a connecting rod shaft 8, a small connecting rod 9, a delay connecting rod 10, a connecting shaft 11 and a connecting pin 12.

[0057] Among them, a machine needle 100 is installed on the needle bar 1, and the needle bar 1 is arranged vertically, and the machine needle 100 is installed at the lower end of the needle bar 1. Preferably, a needle cobalt 16 is provided at the lower end of the needle bar 1, and a plurality of machine needles 100 are installed on the needle cobalt 16, and the plurality of machine needles 100 are arranged in a row at intervals, and the needle tips of the plurality of machine needles 100 are arranged in sequence from high to low. When the needle bar 1 moves up and down, the needle cobalt 16 and the machine needle 100 are driven to move up and down synchronously.

[0058] 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. A piercing head shaft 3 extends from the needle bar piercing head 2, and the piercing head shaft 3 is perpendicular to the needle bar 1. Preferably, the piercing head shaft 3 and the needle bar piercing head 2 are an integral part.

[0059] The slide groove 4 is fixedly arranged, and the slide groove 4 is arranged parallel to the needle bar 1. Preferably, the slide groove 4 extends vertically. The piercing head shaft 3 is slidably matched with the slide groove 4, that is, the piercing head shaft 3 can be slidably inserted into the slide groove 4 along the slide groove 4, so that the up and down movement of the piercing head shaft 3 is constrained by the slide groove 4, which can guide and limit the up and down movement of the needle bar piercing head 2 and the needle bar 1. Preferably, the piercing mechanism of the sewing machine of this embodiment also includes a sliding base 13, and the slide groove 4 is arranged on the sliding base 13, and the sliding base 13 is fixed on the casing of the sewing machine, so that the slide groove 4 is fixedly arranged. Preferably, a slider 14 is provided on the end of the piercing head shaft 3 away from the needle bar 1, and the slider 14 can be slidably arranged in the slide groove 4, that is, the piercing head shaft 3 is slidably matched with the slide groove 4 through the slider 14. Furthermore, a stopper 15 is provided on the piercing head shaft 3 , which is located on the side of the slider 14 close to the needle rod 1 and is clamped to the outer side of the slide groove 4 . The stopper 15 is fixed on the piercing head shaft 3 so that the slider 14 is always kept in the slide groove 4 .

[0060] The needle bar crank 5 is fixed on the upper shaft 6, and the upper shaft 6 is driven to rotate, driving the needle bar crank 5 to rotate synchronously therewith.

[0061] One end of the needle bar connecting rod 7 is hinged to the needle bar crank 5 through the connecting rod shaft 8, and the needle bar connecting rod 7 is driven to move when the needle bar crank 5 rotates.

[0062] One end of the small connecting rod 9 is hinged on the needle head shaft 3, which is used to drive the needle head shaft 3 to move up and down, thereby driving the needle bar needle head 2, the needle bar 1, the needle cobalt 16 and the machine needle 100 to move up and down.

[0063] One end of the delay link 10 is hinged to a fixed fulcrum through a connecting shaft 11, and the fixed fulcrum may be a sliding base 13 or a housing of a sewing machine, that is, one end of the delay link 10 may be hinged to the sliding base 13 or the housing of the sewing machine through the connecting shaft 11. The connecting shaft 11 may be an axial screw.

[0064] The other end of the needle bar connecting rod 7, the other end of the small connecting rod 9 and the other end of the delay connecting rod 10 are hinged to each other through a connecting pin 12, and the upper shaft 6, the connecting rod shaft 8, the connecting pin 12, the connecting shaft 11 and the tying head shaft 3 are parallel to each other.

[0065] Therefore, the piercing mechanism of the sewing machine of this embodiment is additionally provided with a connecting pin 12, a small connecting rod 9 and a delay connecting rod 10 between the needle bar connecting rod 7 and the piercing head shaft 3 of the needle bar piercing head 2. When the needle bar crank 5 rotates and drives the needle bar connecting rod 7 to move, the needle bar connecting rod 7 drives the connecting pin 12 to move, thereby driving the small connecting rod 9 and the delay connecting rod 10 to move, so that the small connecting rod 9 drives the piercing head shaft 3 to move, and under the constraint of the slide groove 4, the piercing head shaft 3 moves up and down with the needle bar piercing head 2, the needle bar 1, the needle cobalt 16 and the machine needle 100, and at the same time the delay connecting rod 10 rotates The connecting shaft 11 swings and reacts on the connecting pin 12, which can control the speed at which the small connecting rod 9 drives the piercing head shaft 3 to move up and down, thereby reducing the recovery speed of the machine needle 100 during the thread hooking process of the bending needle 300 under the action of the delay connecting rod 10. Therefore, it is not necessary to reduce the radius of the needle bar crank 5 to ensure that the bending needle 300 can hook the thread normally (that is, to ensure the dimension c), while reducing the depth of the lowest point of the machine needle 100 (that is, reducing the dimension a) and increasing the height of the highest point of the needle 100 (that is, increasing the dimension b). Figure 5 As shown, when the needle 100 is inserted to the lowest point, it is higher than the existing conventional piercing mechanism, that is, the needle 100 does not need to penetrate very deeply into the fabric when piercing the material, thereby ensuring that the fabric is not damaged by the needle 100. At the same time, when the needle 100 rises to the highest point, it is higher than the conventional piercing mechanism, that is, when the needle 100 rises to the highest point, there is enough distance between the needle tip of the needle 100 and the upper surface of the needle plate 200 to release the material, thereby being able to sew thicker fabrics.

[0066] See also Figure 2 Preferably, the piercing mechanism of the sewing machine of this embodiment further comprises a needle plate 200, a looper 300 and a looper drive assembly 400. The needle plate 200 is located below the needle bar 1, the looper 300 is located below the needle plate 200, and the looper drive assembly 400 drives the looper 300 to move and cooperates with the up and down movement of the machine needle 100 to form the sewing stitch of the sewing machine. The looper drive assembly 400 can adopt an existing structure, which will not be described in detail herein.

[0067] 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.

[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: A needle bar (1) equipped with a machine needle (100); A needle bar piercing head (2) is fixedly mounted on the needle bar (1), and a piercing head axis (3) extending from the needle bar piercing head (2) and perpendicular to the needle bar (1); A slide groove (4) is fixedly arranged and parallel to the needle rod (1), and the piercing head shaft (3) is slidably matched with the slide groove (4); The needle bar crank (5) is fixedly mounted on the upper shaft (6) which is driven to rotate; A needle bar connecting rod (7), one end of which is hinged to the needle bar crank (5) through a connecting rod shaft (8); A small connecting rod (9), one end of which is hinged to the piercing head shaft (3); A delay link (10), one end of which is hinged to a fixed fulcrum via a connecting shaft (11); The other end of the needle bar connecting rod (7), the other end of the small connecting rod (9) and the other end of the delay connecting rod (10) are hinged to each other via a connecting pin (12); The upper shaft (6), the connecting rod shaft (8), the connecting pin (12), the connecting shaft (11) and the piercing head shaft (3) are parallel to each other.

2. The material-piercing mechanism of a sewing machine according to claim 1, characterized in that: It also comprises a sliding base (13), the sliding groove (4) is arranged on the sliding base (13), and the sliding base (13) is fixed on the casing of the sewing machine.

3. The material-piercing mechanism of a sewing machine according to claim 3, characterized in that: The fixed fulcrum is the sliding base (13).

4. The material-piercing mechanism of a sewing machine according to claim 1, characterized in that: The fixed fulcrum is the casing of the sewing machine.

5. The material-piercing mechanism of a sewing machine according to claim 1, characterized in that: A sliding block (14) is provided on one end of the piercing head shaft (3) away from the needle rod (1), and the sliding block (14) is slidably arranged in the sliding groove (4).

6. The material-piercing mechanism of a sewing machine according to claim 5, characterized in that: A stopper (15) is provided on the piercing head shaft (3), and the stopper (15) is located on a side of the slide block (14) close to the needle rod (1) and is clamped on the outer side of the slide groove (4).

7. The material-piercing mechanism of a sewing machine according to claim 1, characterized in that: A needle cobalt (16) is provided at the lower end of the needle bar (1), and a plurality of machine needles (100) are mounted on the needle cobalt (16). The plurality of machine needles (100) are arranged in a row at intervals, and the needle tips of the plurality of machine needles (100) are arranged in sequence from high to low.

8. The material-piercing mechanism of a sewing machine according to claim 1, characterized in that: It also includes a needle plate (200), a curved needle (300) and a curved needle drive assembly (400), wherein the needle plate (200) is located below the needle bar (1), the curved needle (300) is located below the needle plate (200), and the curved needle drive assembly (400) drives the curved needle (300) to move and cooperates with the up and down movement of the machine needle (100) to form the sewing stitch of the sewing machine.

9. 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 8.

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