Presser bar oscillating mechanism and sewing machine

Abstract

The present application relates to sewing machine technical field, especially a kind of pressure bar swing mechanism and sewing machine.The pressure bar swing mechanism includes machine shell, pressure bar, presser foot assembly and automatic driving assembly, pressure bar can be axially moved and is arranged on machine shell along the direction of cloth feeding and deflects, the bottom end of pressure bar is axially connected with presser foot assembly, and pressure bar can drive presser foot assembly to carry out lift presser foot action, automatic driving assembly is arranged on machine shell and is hinged with pressure bar by driving end;And sewing machine uses the pressure bar swing mechanism described above.The pressure bar swing mechanism and sewing machine of the present application have large adjustment range, high adjustment accuracy and can be automatically adjusted.

Description

Technical Field

[0001] This invention relates to the field of sewing machine technology, and more particularly to a pressure bar swing mechanism, and a sewing machine employing the pressure bar swing mechanism. Background Technology

[0002] A flatbed sewing machine is a common sewing device in the textile machinery industry. It can sew two or more layers of fabric together by forming a lockstitch using a needle, shuttle, and two threads. During the sewing process, the presser foot, as one of the important components of the flatbed sewing machine, not only holds the fabric down but also guides the stitch to ensure its evenness and stability.

[0003] However, on existing flatbed sewing machines, the presser foot can only be adjusted up and down with the presser bar but cannot rotate on its own angle. This design is sufficient for sewing most fabrics of ordinary thickness. But when sewing fabrics of special thickness (such as thicker denim and thinner tulle), the fixed angle of the presser foot may lead to poor thread take-up due to an unsuitable thread take-up groove size on the presser foot, thus affecting the quality and efficiency of thread take-up.

[0004] To address the issue of poor yarn take-up, some manufacturers have attempted to add adjustable mechanisms to the presser foot, allowing users to adjust the angle of the presser foot plate according to different fabric thicknesses, thereby optimizing the yarn take-up quality. For example, an adjustable presser foot mechanism disclosed in patent CN222064857U adjusts the angle of the presser foot plate by adjusting the position of the spring suspension on the presser foot plate. However, in actual use, this mechanism still has the following problems: (1) The angle adjustment range is limited and cannot fully meet the needs of fabrics of various thicknesses; (2) Each angle adjustment requires manual adjustment, which cannot be adjusted in time when the thickness changes rapidly; (3) The accuracy of the angle adjustment is also very limited, which may affect the yarn take-up quality because it is impossible to adjust to the optimal angle accurately. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a pressure bar swing mechanism and a sewing machine with a large adjustment range, high adjustment accuracy and automatic adjustment capability.

[0006] The present invention adopts the following technical solution:

[0007] The present invention provides a pressure bar swing mechanism, including a housing, a pressure bar, a pressure foot assembly, and an automatic drive assembly. The pressure bar is axially movable and deflected on the housing along the fabric feeding direction. The bottom end of the pressure bar is axially connected to the pressure foot assembly, and the pressure bar can drive the pressure foot assembly to perform a lifting action. The automatic drive assembly is mounted on the housing and is hinged to the pressure bar through a drive end.

[0008] Preferably, it also includes a pressure bar support assembly, which is rotatably mounted on the housing in the fabric feeding direction, and the pressure bar is axially movable and passes through the pressure bar support assembly.

[0009] Preferably, it also includes a pressure regulating assembly, which includes a pressure regulating guide rod, a pressure regulating rod guide seat, and a spring. The bottom end of the pressure regulating guide rod is limited and installed in the receiving groove of the pressure regulating rod guide seat, and the pressure regulating rod guide seat can deflect relative to the pressure regulating guide rod along the fabric feeding direction. The pressure regulating rod guide seat is connected to the top end of the pressure rod, and the spring is sleeved on the pressure regulating guide rod and is always in a compressed state to apply pressure to the pressure foot assembly.

[0010] Preferably, it also includes a presser foot lifting assembly, which includes a lifting drive sub-assembly, a presser foot lifting plate, and a presser rod guide. The lifting drive sub-assembly is mounted on the machine housing. The presser foot lifting plate is connected to the drive end of the lifting drive sub-assembly, and the presser foot lifting plate has a mating groove with a top opening. The presser rod guide is sleeved and fixed on the presser rod, and the protruding end of the presser rod guide passes through the mating groove. The protruding end of the presser rod guide can deflect within the mating groove along the fabric feeding direction.

[0011] Preferably, the lifting drive sub-assembly includes a lifting foot lever, a lifting foot cam, and a lifting foot lever body. The lifting foot lever is hinged to the housing and connected to the lifting foot cam via a lifting foot cam shaft. The lifting foot lever body is vertically mounted on the housing. The working surface of the lifting foot cam is in close contact with the working surface of the lifting foot lever body, and the lifting foot lever body is connected to the lifting foot plate.

[0012] Preferably, the pressure rod support assembly includes a pressure rod support and a pressure rod support swing shaft. The pressure rod support is fixedly connected to the pressure rod support swing shaft, and the pressure rod support swing shaft is rotatably mounted on the housing. The pressure rod is axially movable and passes through the pressure rod support. The automatic drive assembly is hinged to the pressure rod support via a drive end.

[0013] Preferably, the presser foot assembly includes a presser foot handle, a presser foot pin, and a presser foot plate. The bottom end of the presser bar is axially connected to the presser foot handle, and the presser foot plate is hinged to the presser foot handle via the presser foot pin.

[0014] Preferably, the automatic drive assembly includes a drive component, a drive crank, and a connecting rod. The drive component is fixed to the housing by a fixed bracket, the drive crank is fixed to the drive shaft of the drive component, and the connecting rod is hinged to the drive crank by a drive connecting rod pin and is also hinged to the pressure rod.

[0015] The present invention also provides a sewing machine employing any of the above-mentioned pressure bar swing mechanism.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] When in use, the pressure bar swing mechanism of the present invention can be activated by starting the automatic drive component, which will drive the pressure bar to adjust the angle, thereby allowing the pressure foot component to swing with the pressure bar to adjust the position of the take-up hole.

[0018] Obviously, compared with the existing solution of adjusting the position of the take-up hole by adjusting the angle of the presser foot plate relative to the presser foot handle, the presser rod swing mechanism of the present invention adjusts the position of the take-up hole by adjusting the angle of the presser rod, and the angle adjustment range is larger; moreover, since the presser rod swing mechanism of the present invention adjusts the angle of the presser rod through an automatic drive component, it can achieve a small angle deflection and the adjustment accuracy is also high.

[0019] The sewing machine of the present invention naturally possesses the aforementioned beneficial effects due to the use of the above-described pressure bar swing mechanism, which will not be elaborated further here. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the pressure rod swing mechanism in an embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the structure of the pressure rod swing mechanism after the housing is removed in an embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the structure of the pressure rod support assembly on the pressure rod swing mechanism in an embodiment of the present invention.

[0023] Figure 4 This is a schematic diagram of the structure of the pressure foot assembly on the pressure rod swing mechanism in an embodiment of the present invention.

[0024] Figure 5 This is a schematic diagram of the automatic drive component on the lever swing mechanism in an embodiment of the present invention.

[0025] Figure 6 This is a schematic diagram of the pressure adjustment component on the pressure lever swing mechanism in an embodiment of the present invention.

[0026] Figure 7 This is a schematic diagram of the structure of the pressure bar swing mechanism lifting pressure foot assembly in an embodiment of the present invention.

[0027] The reference numerals in the attached figures are explained as follows:

[0028] 1. Housing; 6. Voltage regulating assembly

[0029] 2. Pressure rod 601, pressure adjusting guide rod

[0030] 3. Pressure rod bracket assembly 602, pressure rod guide seat

[0031] 301, pressure rod bracket; 603, spring.

[0032] 302, pressure rod bracket swing shaft; 604, receiving groove.

[0033] 303, fixing screw; 605, adjusting screw

[0034] 4. Presser foot assembly 606, pressure adjusting nut

[0035] 401, Presser foot handle; 7, Presser foot lifting assembly

[0036] 402, Presser foot pin; 701, Presser foot lifting plate

[0037] 403, Pressure Foot Plate; 702, Pressure Rod Guide Frame

[0038] 5. Automatic drive component 703, mating slot

[0039] 501, driving component 704, protruding end

[0040] 502, Drive crank; 705, Lifting press foot handle

[0041] 503, connecting rod 706, pressure foot lifting cam

[0042] 504, Fixed bracket; 707, Lifting foot lever body

[0043] 505, Drive linkage pin; 708, Presser foot camshaft Detailed Implementation

[0044] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0045] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0048] See Figure 1 This embodiment provides a pressure bar swing mechanism, including a housing 1, a pressure bar 2, a pressure foot assembly 4, and an automatic drive assembly 5. The pressure bar 2 is axially movable and deflected on the housing 1 along the fabric feeding direction. The bottom end of the pressure bar 2 is axially connected to the pressure foot assembly 4, and the pressure bar 2 can drive the pressure foot assembly 4 to perform a lifting action. The automatic drive assembly 5 is mounted on the housing 1 and is hinged to the pressure bar 2 through a drive end.

[0049] In this embodiment, the pressure bar swing mechanism can be used by activating the automatic drive component 5, which will drive the pressure bar 2 to adjust its angle, thereby causing the pressure foot component 4 to swing with the pressure bar 2 to adjust the position of the take-up hole.

[0050] Obviously, compared with the existing solution of adjusting the position of the take-up hole by adjusting the angle of the presser foot plate relative to the presser foot handle, the presser bar swing mechanism of this embodiment adjusts the position of the take-up hole by adjusting the angle of the presser bar, which has a larger angle adjustment range; moreover, since the presser bar swing mechanism of this embodiment adjusts the angle of the presser bar through the automatic drive component 5, it can achieve a small angle deflection and the adjustment accuracy is also high.

[0051] Preferably, see Figure 1 The pressure bar swing mechanism in this embodiment also includes a pressure bar support assembly 3. The pressure bar support assembly 3 is rotatably mounted on the housing 1 along the fabric feeding direction, and the pressure bar 2 is axially movable and passes through the pressure bar support assembly 3. In actual use, the pressure bar support assembly 3 can drive the pressure bar 2 to adjust its angle by activating the automatic drive assembly 5.

[0052] Preferably, see Figure 1 , Figure 2 and Figure 6The pressure bar swing mechanism in this embodiment also includes a pressure regulating component 6. The pressure regulating component 6 includes a pressure regulating guide rod 601, a pressure regulating rod guide seat 602, and a spring 603. The bottom end of the pressure regulating guide rod 601 is limited and installed in the receiving groove 604 of the pressure regulating rod guide seat 602, and the pressure regulating rod guide seat 602 can deflect relative to the pressure regulating guide rod 601 along the fabric feeding direction. The pressure regulating rod guide seat 602 is connected to the top end of the pressure bar 2. The spring 603 is sleeved on the pressure regulating guide rod 601 and is always in a compressed state to apply pressure to the pressure foot assembly 4.

[0053] The pressure regulating component 6 is designed so that after the pressure rod 2 completes the lifting action of the presser foot, the spring 603 drives the pressure rod 2 to descend, thereby driving the presser foot component 4 to fall to the lowest end; while the accommodating groove 604 on the pressure regulating rod guide seat 602 provides space for the deflection of the pressure rod 2 along the fabric feeding direction, avoiding interference from the presence of the pressure regulating guide rod 601 on the deflection of the pressure rod.

[0054] Better, see Figure 1 , Figure 2 and Figure 6 In this embodiment, the pressure regulating assembly 6 further includes a pressure regulating screw 605 and a pressure regulating nut 606. The pressure regulating screw 605 is marked with scale values ​​and is screwed onto the housing 1. The top end of the pressure regulating guide rod 601 is connected to the pressure regulating screw 605, and the pressure regulating nut 606 is screwed onto the portion of the pressure regulating screw 605 that protrudes from the housing 1. The pressure regulating assembly 6 can adjust the screw position of the pressure regulating screw 605 with reference to the scale values ​​to adjust the state of the spring 603, thereby adjusting the pressure of the pressure foot when the pressure foot assembly 4 is at its lowest point.

[0055] Preferably, see Figure 1 , Figure 2 and Figure 7 The pressure bar swing mechanism in this embodiment also includes a pressure foot lifting assembly 7. The pressure foot lifting assembly 7 includes a lifting drive sub-assembly, a pressure foot lifting plate 701, and a pressure bar guide 702. The lifting drive sub-assembly is mounted on the housing 1. The pressure foot lifting plate 701 is connected to the drive end of the lifting drive sub-assembly, and the pressure foot lifting plate 701 has a mating groove 703 with a top opening. The pressure bar guide 702 is sleeved and fixed on the pressure bar 2. The protruding end 704 of the pressure bar guide 702 passes through the mating groove 703, and the protruding end 704 of the pressure bar guide 702 can deflect within the mating groove 703 along the fabric feeding direction.

[0056] When the presser foot needs to be lifted, the lifting drive sub-assembly drives the presser foot lifting plate 701 to rise. The presser rod guide 702 is then lifted synchronously under the drive of the presser foot lifting plate 701. Since the presser rod guide 702 is sleeved and fixed on the presser rod 2, the presser rod 2 drives the presser foot assembly 4 to rise. In addition, the matching arrangement of the mating groove 703 and the protruding end 704 allows the presser foot lifting plate 701 to drive the presser rod guide 702 to rise through the mating groove 703. On the other hand, it also reserves space for the deflection of the presser rod 2 along the fabric feeding direction, avoiding interference between the presser rod guide 702 and the presser foot lifting plate 701, which would affect the deflection of the presser rod 2.

[0057] Preferably, see Figure 1 , Figure 2 and Figure 7 The lifting drive sub-assembly includes a presser foot lever 705, a presser foot cam 706, and a presser foot lever 707. The presser foot lever 705 is hinged to the housing 1 and connected to the presser foot cam 706 via a presser foot cam shaft 708. The presser foot lever 707 is vertically mounted on the housing 1. The working surface of the presser foot cam 706 is in close contact with the working surface of the presser foot lever 707. The presser foot lever 707 is connected to the presser foot lifting plate 701. When it is necessary to lift the presser foot lifting plate 701 through the lifting drive sub-assembly, the presser foot lever 705 is manually controlled to rotate the presser foot cam 706, which raises the presser foot lever 707, thereby lifting the presser foot lifting plate 701.

[0058] Preferably, see Figures 1 to 3 The pressure bar support assembly 3 includes a pressure bar support 301 and a pressure bar support swing shaft 302. The pressure bar support 301 is fixedly connected to the pressure bar support swing shaft 302, which is rotatably mounted on the housing 1. The pressure bar 2 is axially movable and passes through the pressure bar support 301. The automatic drive assembly 5 is hinged to the pressure bar support 301 via its drive end. The pressure bar support 301 provides guidance for the lifting and lowering of the pressure bar 2, while the pressure bar support swing shaft 302 enables the deflection of the pressure bar 2 along the fabric feeding direction.

[0059] Better, see Figure 2 and Figure 3 In this embodiment, the pressure rod bracket 301 is fastened to the pressure rod bracket swing shaft 302 by fixing screws 303.

[0060] Preferably, see Figure 1 , Figure 2 and Figure 4 The presser foot assembly 4 includes a presser foot handle 401, a presser foot pin 402, and a presser foot plate 403. The bottom end of the presser rod 2 is axially connected to the presser foot handle 401, and the presser foot plate 403 is hinged to the presser foot handle 401 through the presser foot pin 402.

[0061] Preferably, see Figure 1 , Figure 2 and Figure 5 The automatic drive assembly 5 includes a drive component 501, a drive crank 502, and a connecting rod 503. The drive component 501 is fixed to the housing 1 by a fixing bracket 504. The drive crank 502 is fixed to the drive shaft of the drive component 501. The connecting rod 503 is hinged to the drive crank 502 by a drive connecting rod pin 505, and the connecting rod 503 is also hinged to the pressure rod 2. When the automatic drive assembly 5 needs to drive the pressure rod 2 to deflect, the drive component 501 drives the drive crank 502 to rotate, which causes the connecting rod 503 to drive the pressure rod 2 to deflect synchronously.

[0062] Specifically, in this embodiment, the connecting rod 503 is hinged to the pressure rod support assembly 3, so as to... Figure 2 For example, defining the left side of the drawing as left and the right side as right, when the driving component 501 rotates clockwise, the driving crank 502 also rotates clockwise, causing the connecting rod 503 to move to the left. Simultaneously, the connecting rod 503 causes the pressure rod bracket 301 to swing counterclockwise around the pressure rod bracket pivot 302, and the pressure rod 2 swings counterclockwise along with the pressure rod bracket 301, thereby moving the pressure foot assembly 4 to the right, achieving the effect of adjusting the position of the pressure foot take-up hole forward. Conversely, when the driving component 501 rotates counterclockwise, it achieves the effect of adjusting the position of the pressure foot take-up hole backward. Furthermore, when it is necessary to lift the pressure foot, the driving component 501 needs to automatically return to the position where the pressure rod 2 is vertical to ensure that no interference occurs during the lifting of the pressure foot.

[0063] Preferably, in this embodiment, the drive unit 501 can be a drive motor or a rotary cylinder.

[0064] This embodiment also provides a sewing machine that employs the aforementioned pressure bar swing mechanism. Because the sewing machine of this embodiment uses the simple pressure bar swing mechanism described above, it can quickly adjust the position of the take-up hole; moreover, the entire take-up hole position adjustment process is simple and has high adjustment accuracy; furthermore, thanks to the presence of the pressure bar swing mechanism, the sewing machine can also achieve greater adaptability and flexibility.

[0065] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A lever swing mechanism, characterized in that, The device includes a housing (1), a pressure bar (2), a presser foot assembly (4), and an automatic drive assembly (5). The pressure bar (2) is axially movable and deflected on the housing (1) along the fabric feeding direction. The bottom end of the pressure bar (2) is axially connected to the presser foot assembly (4), and the pressure bar (2) can drive the presser foot assembly (4) to perform a presser foot lifting action. The automatic drive assembly (5) is mounted on the housing (1) and is hinged to the pressure bar (2) through a drive end.

2. The lever swing mechanism according to claim 1, characterized in that, It also includes a pressure bar support assembly (3), which is rotatably mounted on the housing (1) along the fabric feeding direction, and the pressure bar (2) is axially movable and passes through the pressure bar support assembly (3).

3. The lever swing mechanism according to claim 1, characterized in that, It also includes a pressure regulating assembly (6), which includes a pressure regulating guide rod (601), a pressure regulating rod guide seat (602), and a spring (603). The bottom end of the pressure regulating guide rod (601) is limited and installed in the receiving groove (604) of the pressure regulating rod guide seat (602), and the pressure regulating rod guide seat (602) can deflect relative to the pressure regulating guide rod (601) along the fabric feeding direction. The pressure regulating rod guide seat (602) is connected to the top end of the pressure rod (2). The spring (603) is sleeved on the pressure regulating guide rod (601) and is always in a compressed state to apply pressure to the pressure foot assembly (4).

4. The lever swing mechanism according to claim 1, characterized in that, It also includes a presser foot lifting assembly (7), which includes a lifting drive sub-assembly, a presser foot lifting plate (701), and a presser rod guide (702). The lifting drive sub-assembly is disposed on the housing (1). The presser foot lifting plate (701) is connected to the drive end of the lifting drive sub-assembly. The presser foot lifting plate (701) has a mating groove (703) with a top opening. The presser rod guide (702) is sleeved and fixed on the presser rod (2). The protruding end (704) of the presser rod guide (702) passes through the mating groove (703). The protruding end (704) of the presser rod guide (702) can deflect in the mating groove (703) along the fabric feeding direction.

5. The lever swing mechanism according to claim 4, characterized in that, The lifting drive sub-assembly includes a presser foot lever (705), a presser foot cam (706), and a presser foot lever (707). The presser foot lever (705) is hinged to the housing (1). The presser foot lever (705) is connected to the presser foot cam (706) via a presser foot cam shaft (708). The presser foot lever (707) is vertically mounted on the housing (1). The working surface of the presser foot cam (706) is in close contact with the working surface of the presser foot lever (707). The presser foot lever (707) is connected to the presser foot lifting plate (701).

6. The lever swing mechanism according to claim 2, characterized in that, The pressure rod support assembly (3) includes a pressure rod support (301) and a pressure rod support swing shaft (302). The pressure rod support (301) is fixedly connected to the pressure rod support swing shaft (302). The pressure rod support swing shaft (302) is rotatably mounted on the housing (1). The pressure rod (2) is axially movable and passes through the pressure rod support (301). The automatic drive assembly (5) is hinged to the pressure rod support (301) through the drive end.

7. The lever swing mechanism according to claim 1, characterized in that, The presser foot assembly (4) includes a presser foot handle (401), a presser foot pin (402), and a presser foot plate (403). The bottom end of the presser rod (2) is axially connected to the presser foot handle (401), and the presser foot plate (403) is hinged to the presser foot handle (401) through the presser foot pin (402).

8. The lever swing mechanism according to claim 1, characterized in that, The automatic drive assembly (5) includes a drive member (501), a drive crank (502), and a connecting rod (503). The drive member (501) is fixed to the housing (1) by a fixed bracket (504). The drive crank (502) is fixed to the drive shaft of the drive member (501). The connecting rod (503) is hinged to the drive crank (502) by a drive connecting rod pin (505), and the connecting rod (503) is hinged to the pressure rod (2).

9. A sewing machine, characterized in that, The lever swing mechanism according to any one of claims 1-8 is adopted.

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