Middle presser foot structure and sewing machine

Abstract

The utility model discloses a middle presser foot structure and a sewing machine, relates to the technical field of sewing machines, and aims to solve the problem that the existing sewing machine is easy to leak down during sewing, the middle presser foot structure comprises a middle presser foot which is movably arranged on an upper machine head, and the middle presser foot is in a bowl shape; the bottom of the middle presser foot is sequentially provided with a needle passing hole and a cloth pressing cavity from top to bottom, the needle passing hole and the cloth pressing cavity are coaxially arranged and communicated with each other, the diameter of the cloth pressing cavity is larger than that of the needle passing hole, a needle hole plate matched with the cloth pressing cavity is arranged under the middle presser foot, and the cloth pressing cavity is matched with the needle hole plate. Cloth and down feather (wrapped in sewing cloth) are pressed during sewing, the down feather is prevented from being brought out of the sewing cloth by a machine needle and a sewing thread, and down feather leakage is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewing machine technical field, more specifically, relate to a middle presser foot structure and sewing machine. BACKGROUND

[0002] Sewing machine is with one or more sewing line, on the seam material forms one or more stitches, makes one or more seam material interlaced or sewn up the machine. Sewing machine can sew cotton, hemp, silk, wool, synthetic fiber etc. fabric and leather, plastic, paper product, sews the neat and beautiful, flat firm, sewing speed is fast, easy to use, therefore get the widespread use.

[0003] Sewing machine when carrying out first filling after sewing, will appear the situation of leaking down, will lead to sewing quality reduction, sewing stitch is bad, cloth scrap etc. situation, influence clothing quality and the economy of factory, the existing method is to increase a middle presser foot mechanism on the sewing machine, make the cloth around the needle in the sewing process be pressed by the middle presser foot, to improve the sewing quality, but the existing sewing machine middle presser foot mechanism still cannot very good solve the problem of leaking down and bad sewing effect.

[0004] Therefore, how to solve the existing sewing machine when sewing easy to appear the problem of leaking down, is the urgent problem of the present technical personnel in the field. CONTENT OF THE UTILITY MODEL

[0005] Therefore, the utility model aims at providing a middle presser foot structure, which can prevent the needle and the sewing thread from taking the down from the sewing cloth and avoid the situation of leaking down.

[0006] Another object of the utility model is to provide a sewing machine comprising the above-mentioned middle presser foot structure, which can improve the sewing effect.

[0007] In order to achieve the above object, the utility model provides the following technical scheme:

[0008] A middle presser foot structure, which comprises a movable middle presser foot arranged on a sewing head, the middle presser foot is in the shape of a bowl, the bottom of the middle presser foot is sequentially provided with a needle passing hole and a cloth pressing cavity from top to bottom, the needle passing hole and the cloth pressing cavity are coaxially arranged and mutually penetrated, the diameter of the cloth pressing cavity is larger than that of the needle passing hole, and a needle hole plate is arranged below the middle presser foot and cooperates with the cloth pressing cavity.

[0009] Preferably, the middle presser foot comprises a bowl bottom and a bowl body, the connecting part of the bowl bottom and the bowl body is connected by a circular arc, the top of the bowl body is provided with an inner concave arc surface, and the bowl bottom is provided with the needle passing hole and the cloth pressing cavity.

[0010] Preferably, the bowl body is provided with a connecting part extending along the axial direction of the cloth pressing cavity, the connecting part is provided with a waist-shaped mounting hole extending along the axial direction of the cloth pressing cavity, and the connecting part is connected with the sewing head through the mounting hole and a screw.

[0011] Preferably, the upper machine head is fixed to the machine frame, and the lower machine head is further arranged on the machine frame and located below the upper machine head, and the top end of the lower machine head is provided with a needle plate in a circular ring structure, and the needle hole plate is arranged in the mounting hole in the middle of the needle plate.

[0012] Preferably, the upper machine head is provided with a first driving motor, a first synchronous wheel assembly is arranged on the driving shaft of the first driving motor, the first synchronous wheel assembly is connected to the upper rotating shaft, the upper rotating shaft is provided with a needle bar crank, one end of the needle bar crank is connected to one end of the thread lifting connecting rod assembly, the middle part of the thread lifting connecting rod assembly is fixed to the machine frame, and the other end of the thread lifting connecting rod assembly is connected to the needle assembly.

[0013] Preferably, the needle assembly comprises a needle bar joint connected to the thread lifting connecting rod assembly, a needle bar is arranged in the needle bar joint, one end of the needle bar is connected to a needle, one end of the needle bar joint is connected to a sliding block, and the sliding block slides along the limiting sliding rail of the upper machine head.

[0014] Preferably, both ends of the needle bar are provided with sliding sleeves, the sliding sleeves are fixed to the upper machine head, and the needle bar is movably arranged in the sliding sleeves.

[0015] Preferably, the lower machine head is provided with a second driving motor, a second synchronous wheel assembly is arranged on the driving shaft of the second driving motor, the second synchronous wheel assembly is connected to the lower rotating shaft, and the lower rotating shaft is provided with a rotating hook assembly.

[0016] Preferably, the lower machine head is further provided with a tensioning wheel assembly for adjusting the tightness of the synchronous belt of the second synchronous wheel assembly.

[0017] A sewing machine comprising the middle presser foot structure according to any one of the preceding claims.

[0018] The middle presser foot structure comprises a middle presser foot movably arranged on the upper machine head, and a needle movably arranged on the upper machine head, and the needle and the middle presser foot are driven to move by the upper machine head to realize the sewing process. The bottom of the middle presser foot is sequentially provided with a needle passing hole and a pressing cloth cavity from top to bottom, the needle passing hole and the pressing cloth cavity are coaxially arranged and mutually penetrated, the diameter of the pressing cloth cavity is larger than that of the needle passing hole, so that the needle and the sewing thread can pass through the needle passing hole and the pressing cloth cavity. The needle passing hole can protect the needle and make the sewing stable and beautiful. The bottom of the needle passing hole is provided with the pressing cloth cavity, the bottom of the middle presser foot is provided with a needle hole plate matched with the pressing cloth cavity, and the pressing cloth cavity and the needle hole plate are matched to press the cloth and the down (wrapped in the sewing cloth) during sewing to prevent the needle and the sewing thread from taking the down out of the sewing cloth and avoid the down leakage. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the description of the embodiments or the prior art will be briefly introduced as follows. Obviously, the drawings in the following description only represent the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the provided drawings.

[0020] Figure 1 The structure schematic diagram of the sewing machine provided by the present application is shown in the figure.

[0021] Figure 2 The structure schematic diagram of the middle presser foot structure when working is shown in the figure.

[0022] Figure 3 The sectional view of the middle presser foot structure when working is shown in the figure.

[0023] Figure 4 The structure schematic diagram of the middle presser foot structure is shown in the figure.

[0024] Figure 5 The sectional view of the middle presser foot structure is shown in the figure.

[0025] Figure 6 The exploded view of the upper machine head provided by the present application is shown in the figure.

[0026] Figure 7 The exploded view of the needle assembly provided by the present application is shown in the figure.

[0027] Figure 8 The exploded view of the lower machine head provided by the present application is shown in the figure.

[0028] Reference signs:

[0029] 01-sewing cloth;

[0030] 1-upper machine head;

[0031] 2-needle;

[0032] 3-middle presser foot, 31-passing needle hole, 32-pressing cloth cavity, 33-connection part, 331-mounting hole;

[0033] 4-needle hole plate;

[0034] 5-lower machine head;

[0035] 6-needle plate;

[0036] 7-first driving motor;

[0037] 8-first synchronous wheel assembly;

[0038] 9-upper rotating shaft;

[0039] 10-needle bar crank;

[0040] 11-thread take-up lever assembly;

[0041] 12-needle bar joint;

[0042] 13-needle bar;

[0043] 14-slid;

[0044] 15-limiting slide rail;

[0045] 16-sliding sleeve;

[0046] 17-second drive motor;

[0047] 18-second synchronous wheel assembly;

[0048] 19-lower rotating shaft;

[0049] 20-shuttle assembly;

[0050] 21-tensioning wheel assembly. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0052] In the utility model, unless explicitly defined and limited, the terms such as "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected, can be mechanically connected, or electrically connected, can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0053] It should be noted that the orientation words such as "upper" and "lower" in the following are defined based on the drawings of the specification.

[0054] The core of the utility model is to provide a middle presser foot structure, which can prevent the machine needle 2 and the sewing thread from taking out the down from the sewing cloth 01, and avoid the occurrence of the down leakage. Another core of the utility model is to provide a sewing machine comprising the above-mentioned middle presser foot structure, which can improve the sewing effect.

[0055] Please refer toFigure 1 、 Figure 2 and Figure 3 A medium pressure foot structure comprises a movable medium pressure foot 3 arranged on a machine head 1, and a movable needle 2 arranged on the machine head 1, the needle 2 and the medium pressure foot 3 are driven to move by the machine head 1 to realize the sewing process, the medium pressure foot 3 is in the shape of a bowl, the bottom of the medium pressure foot 3 is sequentially provided with a needle passing hole 31 and a cloth pressing cavity 32 from top to bottom, the needle passing hole 31 and the cloth pressing cavity 32 are coaxially arranged and penetrate each other, the diameter of the cloth pressing cavity 32 is larger than that of the needle passing hole 31, so that the needle 2 and the sewing thread can pass through the needle passing hole 31 and the cloth pressing cavity 32, the needle passing hole 31 can play a role of needle protection, and the sewing is stable and beautiful, the lower surface of the needle passing hole 31 is provided with the cloth pressing cavity 32, the needle hole plate 4 cooperating with the cloth pressing cavity 32 is arranged directly below the medium pressure foot 3, the cloth pressing cavity 32 and the needle hole plate 4 cooperate to press the cloth and the down (wrapped in the sewing cloth 01) during sewing, so as to prevent the needle 2 and the sewing thread from taking the down out of the sewing cloth 01, and avoid the situation of down leakage.

[0056] The medium pressure foot structure arranged in the above manner has the advantages of good down leakage prevention effect, stable sewing, beautiful sewing stitch, simple structure and convenient use.

[0057] Please refer to Figure 3 、 Figure 4 and Figure 5 The medium pressure foot 3 comprises a bowl bottom and a bowl body, the connection between the bowl bottom and the bowl body is connected by a circular arc transition, the top of the bowl body has an inner concave arc surface, and the bowl bottom is provided with the needle passing hole 31 and the cloth pressing cavity 32.

[0058] It should be noted that the needle passing hole 31 and the cloth pressing cavity 32 are arranged on the bowl bottom, so that the needle 2 and the sewing thread can pass through the needle passing hole 31 and the cloth pressing cavity 32, the needle passing hole 31 can play a role of needle protection during sewing, and the cloth pressing cavity 32 and the needle hole plate 4 cooperate to press the cloth and the down (wrapped in the sewing cloth 01) during sewing, so as to prevent the needle 2 and the sewing thread from taking the down out of the sewing cloth 01.

[0059] The diameter of the needle passing hole 31 is slightly larger than that of the needle 2, and the diameter of the cloth pressing cavity 32 is larger than that of the needle passing hole 31.

[0060] In the above case, the bowl body is provided with a connecting part 33 extending along the axis direction of the cloth pressing cavity 32, the connecting part 33 is provided with a waist-shaped mounting hole 331 extending along the axis direction of the cloth pressing cavity 32, and the connecting part 33 is connected with the machine head 1 through the mounting hole 331 and a screw.

[0061] It can be understood that the medium pressure foot 3 is connected with the machine head 1 through the screw, and the mounting height of the medium pressure foot 3 can be adjusted by arranging the waist-shaped mounting hole 331. The medium pressure foot 3 is driven to move up and down by the machine head 1 to realize the function of lifting the pressure foot.

[0062] Further, the upper machine head 1 is fixed to the frame, and the lower machine head 5 is arranged below the upper machine head 1. The top end of the lower machine head 5 is provided with a needle plate 6 in a circular ring structure. The needle hole plate 4 is arranged in the mounting hole 331 in the middle of the needle plate 6.

[0063] It should be noted that the middle part of the needle plate 6 is formed with a cylindrical needle hole plate 4. The middle part of the needle hole plate 4 is provided with a through hole for the needle 2 to pass through. The up-and-down movement of the needle 2 along the through hole of the needle hole plate 4 is driven by the up-and-down movement of the presser foot 3 and the needle 2 driven by the upper machine head 1.

[0064] Please refer to Figure 6 The first driving motor 7 is arranged on the upper machine head 1. The first driving motor 7 is provided with a driving shaft. The first synchronous wheel assembly 8 is arranged on the driving shaft of the first driving motor 7. The first synchronous wheel assembly 8 is connected to the upper rotating shaft 9. The needle bar 13 crank 10 is arranged on the upper rotating shaft 9. One end of the needle bar 13 crank 10 is connected to one end of the thread lifting connecting rod assembly 11. The middle part of the thread lifting connecting rod assembly 11 is fixed to the frame. The other end of the thread lifting connecting rod assembly 11 is connected to the needle 2 assembly.

[0065] It can be understood that the first driving motor 7 is arranged on the upper machine head 1. One synchronous wheel of the first synchronous wheel assembly 8 is arranged on the motor shaft of the first driving motor 7. The other synchronous wheel is arranged on the upper rotating shaft 9. The two synchronous wheels are connected by a synchronous belt. The upper rotating shaft 9 is connected to the needle bar 13 crank 10 through a bearing. The thread lifting connecting rod assembly 11 is fixed to the upper machine head 1 and the needle bar 13 crank 10.

[0066] During sewing, the driving shaft of the first driving motor 7 is driven to rotate to drive one of the synchronous wheels to rotate. The power is transmitted to the other synchronous wheel through the synchronous belt. The power is transmitted to the upper rotating shaft 9 through the synchronous wheel. The power is transmitted to the needle bar 13 crank 10. The power is transmitted to the needle 2 assembly through the thread lifting connecting rod assembly 11 to drive the needle 2 assembly to move up and down.

[0067] Please refer to Figure 7 The needle 2 assembly includes a needle bar joint 12 connected to the thread lifting connecting rod assembly 11. The needle bar joint 12 is provided with a needle bar 13. One end of the needle bar 13 is connected to the needle 2. One end of the needle bar joint 12 is connected to the sliding block 14. The sliding block 14 slides along the limiting sliding rail 15 of the upper machine head 1.

[0068] It should be noted that the needle bar 13 is fixed to the upper machine head 1 and the thread lifting connecting rod assembly 11 through the needle bar joint 12, the sliding block 14 and the limiting sliding rail 15. The needle 2 is fixed to the needle bar 13. The needle 2 cooperates with the lower machine head 5 to complete the sewing function. During sewing, the sliding block 14 and the limiting sliding rail 15 can limit and guide the needle 2.

[0069] In the above embodiment, the needle bar 13 is provided with a sliding sleeve 16 at both ends, the sliding sleeve 16 is fixed to the upper head 1, and the needle bar 13 is movably arranged in the sliding sleeve 16.

[0070] It can be understood that the sliding sleeve 16 includes an upper sleeve and a lower sleeve, and the upper sleeve and the lower sleeve are fixed to the upper head 1. During sewing, the first driving motor 7 drives the motor shaft to rotate to drive one of the synchronous wheels to rotate, the power is transmitted to the other synchronous wheel through the synchronous belt, and the power is transmitted to the upper shaft 9 through the synchronous wheel, and then transmitted to the needle bar 13 crank 10 through the thread tensioning connecting rod assembly 11, and then transmitted to the needle bar joint 12 to drive the needle bar joint 12 to move up and down, thereby driving the needle bar 13 and the needle 2 to move up and down along the upper sleeve and the lower sleeve.

[0071] Please refer to Figure 8 , the lower head 5 is provided with a second driving motor 17, a second synchronous wheel assembly 18 is installed on the driving shaft of the second driving motor 17, the second synchronous wheel assembly 18 is connected with a lower shaft 19, and a rotating shuttle assembly 20 is arranged on the lower shaft 19.

[0072] It should be noted that the second driving motor 17 is installed on the lower head 5, the large synchronous wheel of the second synchronous wheel assembly 18 is installed on the second driving motor 17, the small synchronous wheel is installed on the lower shaft 19, the second driving motor 17 drives the large synchronous wheel to rotate, the large synchronous wheel drives the small synchronous wheel to rotate through the synchronous belt, and then drives the lower shaft 19 and the rotating shuttle assembly 20 to rotate, thereby cooperating with the upper head 1 to complete the sewing action.

[0073] In the above case, the lower head 5 is also provided with a tensioning wheel assembly 21 for adjusting the tightness of the synchronous belt of the second synchronous wheel assembly 18.

[0074] It can be understood that the tensioning wheel assembly 21 plays a role in adjusting the tightness of the synchronous belt.

[0075] In summary, the middle presser foot structure provided by the utility model has the functions of preventing wool leakage and stable sewing, the wire hole can play a needle protection effect, the machine sewing stability is improved, the design of the cloth pressing cavity 32 plays a wool leakage prevention effect, the structure is simple, the reliability is high, and the cost is low.

[0076] In addition to the middle presser foot structure disclosed in the above embodiments, the utility model also provides a sewing machine comprising the above-mentioned middle presser foot structure, and the structures of other parts of the sewing machine please refer to the prior art, and details are not repeated herein.

[0077] It should be noted that in the present specification, relational terms such as first and second are used only to distinguish one entity from another, and do not necessarily require or imply that there is any such actual relationship or order between these entities.

[0078] The various embodiments are described in the specification by way of progression, each building on the last to facilitate ease of understanding. The same reference numerals are used throughout the drawings and like structure are denoted with like reference numerals.

[0079] The above has carried out the detailed introduction to the sewing machine of the utility model of one medium pressure foot structure. The principle and implementation mode of the utility model have been set forth in this article by applying specific examples, the above embodiment is only used for helping understanding the method and its core thought of the utility model. It should be pointed out that, for ordinary skilled person in the art, on the premise of not departing from the principle of the utility model, the utility model can also be improved and modified in several ways, these improvements and modifications also fall within the protection scope of the utility model claims.

Claims

1. A medium pressure foot structure, characterized in that, The utility model provides a sewing machine needle plate structure, including movable be provided with middle presser foot (3) of upper head (1), the middle presser foot (3) is bowl-shaped, the bottom of middle presser foot (3) is sequentially provided with the needle hole (31) of the needle (2) of upper head (1) and presser foot cavity (32) from top to bottom, the needle hole (31) is coaxial with presser foot cavity (32) and is mutually through, the diameter of presser foot cavity (32) is greater than the diameter of needle hole (31), the bottom of middle presser foot (3) is provided with the needle hole plate (4) with presser foot cavity (32) cooperation.

2. The presser foot structure according to claim 1, characterized by The middle presser foot (3) includes a bowl bottom and a bowl body, the connection between the bowl bottom and the bowl body adopts a circular arc transition connection, the top of the bowl body has an inwardly recessed arc surface, the bowl bottom is provided with the needle hole (31) and the presser foot cavity (32).

3. The presser foot structure according to claim 2, characterized in that The bowl body is provided with a connecting portion (33) extending along the axis direction of the presser foot cavity (32), the connecting portion (33) is provided with a waist-shaped mounting hole (331) extending along the axis direction of the presser foot cavity (32), and the connecting portion (33) is connected with the upper head (1) through the mounting hole (331) and a screw.

4. The presser foot structure according to claim 1, characterized by The upper head (1) is fixed on a machine frame, and a lower head (5) is further arranged on the machine frame, the lower head (5) is located below the upper head (1), the top end of the lower head (5) is provided with a needle plate (6), the needle plate (6) is a circular ring structure, and the needle hole plate (4) is arranged in a mounting hole in the middle of the needle plate (6).

5. The presser foot structure according to claim 4, characterized in that A first driving motor (7) is arranged on the upper head (1), a first synchronous wheel assembly (8) is arranged on the driving shaft of the first driving motor (7), the first synchronous wheel assembly (8) is connected with an upper rotating shaft (9), the upper rotating shaft (9) is provided with a needle bar crank (10), one end of the needle bar crank (10) is connected with a thread lifting linkage assembly (11), the middle of the thread lifting linkage assembly (11) is fixed on the machine frame, and the other end of the thread lifting linkage assembly (11) is connected with a needle assembly.

6. The presser foot structure according to claim 5, characterized by The needle assembly comprises a needle bar joint (12) connected with the thread lifting linkage assembly (11), the needle bar joint (12) is provided with a needle bar (13) therein, one end of the needle bar (13) is connected with the needle (2), one end of the needle bar joint (12) is connected with a sliding block (14), and the sliding block (14) slides along a limiting sliding rail (15) of the upper head (1).

7. The presser foot structure according to claim 6, characterized in that Both ends of the needle bar (13) are provided with sliding sleeves (16), the sliding sleeves (16) are fixed on the upper head (1), and the needle bar (13) is movably arranged in the sliding sleeves (16).

8. The presser foot structure according to claim 4, characterized by A second driving motor (17) is arranged on the lower head (5), a second synchronous wheel assembly (18) is arranged on the driving shaft of the second driving motor (17), the second synchronous wheel assembly (18) is connected with a lower rotating shaft (19), and the lower rotating shaft (19) is provided with a rotating hook assembly (20).

9. The presser foot structure according to claim 8, characterized in that The lower head (5) is further provided with a tensioning wheel assembly (21) for adjusting the tightness of a synchronous belt of the second synchronous wheel assembly (18).

10. A sewing machine characterized by comprising: The utility model provides a sewing machine needle plate structure, including the middle presser foot structure of any one of claims 1-9.

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