Sewing machine with adjustable presser foot pressure

Abstract

The utility model provides a sewing machine of adjustable pressure of presser foot belongs to sewing machine technical field. It solved the problem such as insufficient work stability of existing sewing machine. This sewing machine of adjustable pressure of presser foot, including the casing, the motor fixed on the casing, the swing board hinged on the casing and the presser foot bar of being worn and being able to slide up and down on the casing, the fixedly connected with the sliding seat on the presser foot bar, the swing board is connected with the pull rod between the pivot of motor, still hinged to the sliding block embedded in the sliding seat on the swing board, the lower end of presser foot bar is connected with the presser foot assembly, the fixedly connected with the guide seat of being located one side of presser foot bar on the casing, the side surface of guide seat has the guide groove along vertical setting towards presser foot bar, the fixed block of being located below the sliding seat is fixedly connected on presser foot bar, the sliding block embedded in the guide groove is hinged to the fixed block, and the two side surfaces of sliding block are respectively with the two side surfaces of guide groove abut. This sewing machine can improve the stability of work.

Description

Technical Field

[0001] This utility model belongs to the field of sewing machine technology and relates to a sewing machine with adjustable presser foot pressure. Background Technology

[0002] A sewing machine is a machine that sews fabric together using thread. A sewing machine consists of a needle bar mechanism, thread take-up mechanism, feed mechanism, thread hook mechanism, pressing mechanism, thread winding device, and lubrication device, among which the pressing mechanism includes a presser foot for pressing the fabric down.

[0003] Traditional presser feet typically adjust pressure by compressing a spring using an adjusting screw. However, this method lacks real-time pressure control, and the spring pressure varies significantly between thin and thick materials. Another approach directly adjusts presser foot pressure by controlling the rotational force of a motor, as illustrated in patent document CN204199003U. This sewing machine includes a servo motor, whose output shaft is fixedly connected to a roller. The outer ring of the roller is connected to one end of a pull rod, and the other end of the pull rod is connected to one end of a swing plate. The other end of the swing plate is fixedly connected to a slider, which is embedded in the slider groove of the presser foot crank. The presser foot crank is fixed to a vertically mounted presser foot rod, which also has a pulley bracket. The pulley bracket has a pin and a pulley fixedly mounted on it. The pin movably passes through a guide seat with a transverse groove. The pulley connects to the presser foot bracket, and the presser foot is fixedly mounted on the presser foot bracket.

[0004] In the aforementioned sewing machine, the servo motor rotates, driving the presser foot upwards to lift it, allowing the fabric to be placed on the feed plate below the presser foot. The servo motor then rotates in the opposite direction, driving the presser foot downwards to press the fabric firmly against the feed plate. The fabric is then moved via the feed bracket to perform the sewing operation. The pressure applied to the fabric during sewing is controlled by the rotational force of the servo motor, allowing for different pressure settings for different fabrics. However, in this sewing machine, the presser foot lever is only limited by a pin and rollers, making it prone to circumferential wobbling during operation, affecting the stability of the sewing machine. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a sewing machine with adjustable presser foot pressure, thus solving the technical problem of insufficient working stability in existing sewing machines.

[0006] The objective of this utility model can be achieved through the following technical solutions: A sewing machine with adjustable presser foot pressure includes a machine housing, a motor fixed to the machine housing, a swing plate hinged to the machine housing, and a presser foot rod that passes through the machine housing and can slide up and down. A sliding seat is fixedly connected to the presser foot rod. A pull rod is connected between the swing plate and the motor shaft. A sliding block embedded in the sliding seat is also hinged to the swing plate. A presser foot assembly is connected to the lower end of the presser foot rod. The machine housing has a guide seat located on one side of the presser foot rod. The guide seat has a vertically arranged guide groove on the side facing the presser foot rod. A fixing block located below the sliding seat is fixedly connected to the presser foot rod. A slider embedded in the guide groove is hinged to the fixing block. The two sides of the slider are respectively abutted against the two sides of the guide groove.

[0007] When the sewing machine is working, the motor rotates, driving the swing plate to swing via a pull rod. The swing plate, through a sliding block, drives the sliding seat and presser foot bar to move up and down. During the up-and-down movement of the presser foot bar, the slider slides within the guide groove of the guide seat. The two sides of the slider are respectively in contact with the two sides of the guide groove, thus limiting the slider's position. This, in turn, restricts the presser foot bar circumferentially by the cooperation of the slider and the guide seat, reducing circumferential wobbling of the presser foot bar. Therefore, this sewing machine can improve operational stability.

[0008] In the aforementioned sewing machine with adjustable presser foot pressure, the fixed block has a cylindrical protrusion, and the slider is fitted onto the protrusion. After the slider is fitted onto the protrusion of the fixed block, rotating the slider can adjust its circumferential position on the protrusion, allowing the slider to better adapt to the guide seat and ensuring smooth sliding.

[0009] In the aforementioned sewing machine with adjustable presser foot pressure, the guide seat's side facing away from the presser foot bar rests against the inner side of the machine housing, and the guide seat is fixedly connected to the machine housing by bolts. Several bolts are located on one side of the guide groove and are arranged vertically. This ensures the guide seat is stably fixed to the machine housing, thereby stabilizing the presser foot bar through the slider and the guide seat's circumferential positioning, thus ensuring stable operation of the sewing machine.

[0010] In the aforementioned sewing machine with adjustable presser foot pressure, a motor base is fixedly connected to the machine housing, the motor is fixedly connected to the motor base, a drive gear is fixedly connected to the motor shaft, and a driven gear meshing with the drive gear is hinged to the motor base. One end of the pull rod is hinged to the driven gear. When the motor is working, it drives the drive gear to rotate, which in turn drives the driven gear to rotate, thereby driving the presser foot lever to move up and down via the pull rod. The drive and driven gears allow for speed reduction, enabling more precise control of the presser foot by the motor.

[0011] In the aforementioned sewing machine with adjustable presser foot pressure, the motor base has an arc-shaped limiting groove, into which the hinge shaft between the pull rod and the driven gear is embedded. The limiting groove is used to limit the rotation angle of the driven gear, preventing excessive rotation.

[0012] In the aforementioned sewing machine with adjustable presser foot pressure, an oil groove is provided on the side of the slider. The oil groove can store lubricating oil, which provides lubrication for the slider's sliding motion, allowing the slider to slide smoothly within the guide groove.

[0013] Compared with the prior art, the present invention has the following advantages: A fixed block is fixedly connected to the presser foot bar, located below the sliding seat. A slider is hinged to the fixed block. The slider is embedded in the guide groove of the guide seat, and the two sides of the slider are respectively in contact with the two sides of the guide groove of the guide seat. The cooperation between the guide seat and the slider limits the presser foot bar in the circumferential direction, reduces the wobbling of the presser foot bar in the circumferential direction, and makes the sewing machine work stably. Attached Figure Description

[0014] Figure 1 This is a 3D diagram of a sewing machine.

[0015] Figure 2 This is a 3D view of the sewing machine hidden behind its casing.

[0016] Figure 3 This is a partial 3D view of the sewing machine.

[0017] Figure 4 This is a three-dimensional view of the guide seat, slider, and fixing block of this sewing machine.

[0018] In the diagram, 1 is the housing; 2 is the motor; 3 is the swing plate; 4 is the presser foot rod; 5 is the sliding seat; 6 is the pull rod; 7 is the sliding block; 8 is the presser foot assembly; 9 is the guide seat; 9a is the guide groove; 10 is the fixing block; 10a is the protruding post; 11 is the slider; 11a is the oil groove; 12 is the bolt; 13 is the drive gear; 14 is the motor base; 14a is the limit groove; and 15 is the driven gear. Detailed Implementation

[0019] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0020] like Figure 1 and Figure 2As shown, a sewing machine with adjustable presser foot pressure includes a housing 1. A motor base 14 is fixedly connected to the right end of the housing 1, and a motor 2 is fixedly connected to the motor base 14. The shaft of the motor 2 passes through the motor base 14 and is fixedly connected to a drive gear 13. A driven gear 15 is hinged to the motor base 14, meshing with the drive gear 13, and is located to the left of the drive gear 13. A presser foot rod 4 that can slide up and down is provided at the left end of the housing 1. A swing plate 3 is hinged to the rear side wall of the left end of the housing 1, and a pull rod 6 is hinged between the swing plate 3 and the driven gear 15. A sliding seat 5 is fixedly connected to the presser foot rod 4, and a sliding block 7 embedded in the sliding seat 5 is also hinged to the swing plate 3. A presser foot assembly 8 is connected to the lower end of the presser foot rod 4. The pull rod 6 can also be directly hinged to the drive gear 13. Figure 3 As shown, the motor base 14 has an arc-shaped limiting groove 14a, and the hinge shaft between the pull rod 6 and the driven gear 15 is embedded in the limiting groove 14a. In this embodiment, the hinge shaft between the pull rod 6 and the driven gear 15 is a shaft screw, and the head of the shaft screw is located in the limiting groove 14a.

[0021] like Figure 1 and Figure 2 As shown, a guide seat 9 located on one side of the presser foot rod 4 is fixedly connected to the housing 1, in conjunction with... Figure 4 As shown, the guide seat 9 has a vertically arranged guide groove 9a on the side facing the presser foot rod 4. A fixing block 10 located below the sliding seat 5 is fixedly connected to the presser foot rod 4. A slider 11 is hinged to the fixing block 10 and embedded in the guide groove 9a. The two sides of the slider 11 are respectively in contact with the two sides of the guide groove 9a. Oil grooves 11a are provided on both sides of the slider 11. The fixing block 10 has a cylindrical protrusion 10a, and the slider 11 is fitted onto the protrusion 10a. The slider 11 can also be connected to the fixing block 10 by a shaft screw, that is, the shaft screw passes through the slider 11 and is threaded into the fixing block 10. Through holes are provided on the upper and lower sides of the slider 11, through which lubricating oil can be added to the protrusion 10a. The guide seat 9, facing away from the presser foot 4, rests against the inner side of the housing 1, and is fixedly connected to the housing 1 by bolts 12. Several bolts 12 are located on one side of the guide groove 9a and are arranged vertically. The bolts 12 pass through the rear sidewall of the housing 1 and are threaded into the guide seat 9. Generally, two or three bolts 12 are provided.

[0022] When the sewing machine is working, the motor 2 rotates, driving the swing plate 3 to swing via the pull rod 6. The swing plate 3, through the sliding block 7, drives the sliding seat 5 and the presser foot 4 to move up and down. During the up and down movement of the presser foot 4, the slider 11 slides up and down within the guide groove 9a of the guide seat 9. The two sides of the slider 11 are respectively in contact with the two sides of the guide groove 9a, thus limiting the slider 11 by the two sides of the guide groove 9a. This, in turn, limits the circumferential movement of the presser foot 4 by the cooperation of the slider 11 and the guide seat 9, reducing the circumferential wobbling of the presser foot 4. Therefore, this sewing machine can improve its working stability.

[0023] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A sewing machine with adjustable presser foot pressure, comprising a machine housing (1), a motor (2) fixed to the machine housing (1), a swing plate (3) hinged to the machine housing (1), and a presser foot rod (4) passing through the machine housing (1) and capable of sliding up and down, wherein a sliding seat (5) is fixedly connected to the presser foot rod (4), a pull rod (6) is connected between the swing plate (3) and the rotating shaft of the motor (2), and a sliding block (7) embedded in the sliding seat (5) is also hinged to the swing plate (3), and a presser foot assembly (8) is connected to the lower end of the presser foot rod (4), characterized in that, A guide seat (9) located on one side of the presser foot rod (4) is fixedly connected to the housing (1). The guide seat (9) has a guide groove (9a) arranged vertically on the side facing the presser foot rod (4). A fixing block (10) located below the sliding seat (5) is fixedly connected to the presser foot rod (4). A slider (11) embedded in the guide groove (9a) is hinged to the fixing block (10). The two sides of the slider (11) are respectively attached to the two sides of the guide groove (9a).

2. The sewing machine with adjustable presser foot pressure according to claim 1, characterized in that, The fixing block (10) has a cylindrical protrusion (10a), and the slider (11) is fitted onto the protrusion (10a).

3. The sewing machine with adjustable presser foot pressure according to claim 1, characterized in that, The guide seat (9) is attached to the inner side of the housing (1) on the side opposite to the presser foot rod (4), and the guide seat (9) is fixedly connected to the housing (1) by bolts (12). The bolts (12) are located on one side of the guide groove (9a), and there are several bolts (12) arranged vertically.

4. The sewing machine with adjustable presser foot pressure according to any one of claims 1-3, characterized in that, A motor mount (14) is fixedly connected to the housing (1), and the motor (2) is fixedly connected to the motor mount (14). A drive gear (13) is fixedly connected to the shaft of the motor (2). A driven gear (15) that meshes with the drive gear (13) is hinged to the motor mount (14), and one end of the pull rod (6) is hinged to the driven gear (15).

5. The sewing machine with adjustable presser foot pressure according to claim 4, characterized in that, The motor base (14) has an arc-shaped limiting groove (14a), and the hinge shaft between the pull rod (6) and the driven gear (15) is embedded in the limiting groove (14a).

6. The sewing machine with adjustable presser foot pressure according to any one of claims 1-3, characterized in that, An oil groove (11a) is provided on the side of the slider (11).

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