Presser foot assembly of sewing machine

Abstract

The utility model relates to the technical field of sewing machine presser feet, and discloses a sewing machine presser foot assembly which comprises an installation head and a presser foot, a square-column-shaped inner groove is formed in the installation head, a through opening is formed in the bottom of the inner groove, a lifting block is movably installed in the inner groove, and a rod groove is formed in the bottom of the lifting block. A connecting rod is fixedly mounted at the top of the presser foot, the top end of the connecting rod penetrates through the through opening, extends into the inner groove and is movably inserted into a rod groove in the bottom of the lifting block, a spring is fixedly connected between the top of the inner wall of the rod groove and the top end of the connecting rod, a tooth groove is formed in the left side of the lifting block, and a groove is formed in the left side of the inner wall of the inner groove. According to the cloth sewing machine, the presser foot can apply pressure to cloth with different thicknesses, and when the cloth passes through the sewing position of the cloth, the presser foot can adjust and adapt to the thickness of the sewing position of the cloth, so that the cloth can be sewn smoothly.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing machine presser feet, in particular to a sewing machine presser foot assembly. Background Art

[0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material, so that one or more layers of sewing materials are interwoven or sewn together. The presser foot is an important part of the sewing machine, which is used to apply pressure on the surface of the sewing material to keep the sewing material fixed and ensure the accuracy and reliability of the sewing machine. Usually, when a sewing machine sews fabric, a certain length of thread ends need to be left at the eye of the machine needle at the beginning of the sewing stage to ensure that the thread will not fall out of the eye of the machine needle when sewing. A certain length of thread ends on the eye of the machine needle will remain at the initial sewing position of the sewing material when sewing, forming a "bird's nest" and affecting the beauty of the sewing material.

[0003] However, when using a sewing machine to sew fabrics of different thicknesses, if the presser foot cannot be properly pressed on the top of the fabric, the fabric will not move smoothly, causing uneven stitch distances on the narrow edge lines or material jamming, which will seriously affect the aesthetics of the sewing. In addition, after some fabrics are folded and sewn, the thickness of the folded part will be much thicker than other parts of the fabric, which will prevent the presser foot from passing through the folded part. For this reason, the present application proposes a sewing machine presser foot assembly. Utility Model Content

[0004] In order to solve the problems raised in the above-mentioned background technology, the utility model provides the following technical solutions: a sewing machine presser foot assembly, including a mounting head and a presser foot, the mounting head is provided with a square columnar inner groove, a through opening is provided at the bottom of the inner groove, a lifting block is movably installed inside the inner groove, a rod groove is provided at the bottom of the lifting block, a connecting rod is fixedly installed on the top of the presser foot, the top end of the connecting rod passes through the through opening and extends into the inner groove and is movably inserted into the rod groove at the bottom of the lifting block, and a spring is fixedly connected between the top of the inner wall of the rod groove and the top end of the connecting rod, a tooth groove is provided on the left side of the lifting block, and a tooth groove is provided on the inner groove. A groove is provided on the left side of the inner wall, a bearing is fixedly installed in the groove, a rotating tube is fixedly inserted between the inner ring walls of the bearing, a gear located in the tooth groove is fixedly installed at one end of the rotating tube, a screw hole connected to the groove is provided on the left side of the mounting head, an adjusting bolt is threadedly inserted in the screw hole, one end of the adjusting bolt is movably inserted in the rotating tube, first sliding grooves are provided at the top and bottom of the inner wall of the rotating tube, first sliders are fixedly installed at the top and bottom of one end of the adjusting bolt located inside the rotating tube, and the two first sliders are respectively located in the corresponding first sliding grooves and can slide therein.

[0005] Preferably, one side of the inner wall of the tooth groove is provided with teeth, and the side wall of the gear is meshingly connected with the teeth on one side of the inner wall of the tooth groove.

[0006] Preferably, a slot is provided at the top of the connecting rod, and an insertion rod is fixedly installed at the top of the inner wall of the rod slot. The insertion rod passes through between the springs and is movably inserted into the slot at the top of the connecting rod.

[0007] Preferably, second sliding grooves are provided on both sides of the inner wall of the rod groove, and second sliding blocks are fixedly installed on both sides of the outer wall of the connecting rod. The two second sliding blocks are respectively located in the corresponding second sliding grooves and can slide therein.

[0008] Preferably, a third sliding groove is opened on the right side of the inner wall of the inner groove, and two rotatable rollers are fixedly installed on the right side of the lifting block. The two rollers are located in the third sliding groove and can rotate therein.

[0009] Preferably, there is a gap between the top and bottom ends of the lifting block and the top and bottom of the inner groove.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] By turning the adjusting bolt, the gear is driven to mesh and rotate with the tooth groove on the side of the lifting block, thereby driving the lifting block to complete the adjustment of the upper and lower positions in the inner groove, and when the presser foot passes through the stitching and folding part of the fabric, the presser foot will push the connecting rod to move upward in the rod groove. After the presser foot passes through the stitching and folding part of the fabric, the elastic force of the spring will push the connecting rod and the presser foot down to their original positions, so that the presser foot can apply pressure to fabrics of different thicknesses, and when passing through the stitching part of the fabric, the presser foot can adjust and adapt to the thickness of the stitching part of the fabric, so that the fabric can be stitched smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 It is a schematic diagram of a partial cross-sectional structure of the utility model;

[0015] Figure 3 It is an enlarged structural schematic diagram of A of the utility model;

[0016] Figure 4 It is a schematic diagram of the cross-sectional structure of the connection between the lifting block and the connecting rod of the utility model;

[0017] Figure 5 This is a schematic diagram of the cross-sectional structure of the connection between the adjusting bolt and the rotating tube of the utility model;

[0018] In the figure: 1. mounting head; 2. inner groove; 3. lifting block; 4. rod groove; 5. connecting rod; 6. presser foot; 7. spring; 8. tooth groove; 9. groove; 10. bearing; 11. rotating tube; 12. gear; 13. adjusting bolt; 14. first slide groove; 15. first slider; 16. third slide groove; 17. roller; 18. second slide groove; 19. second slider; 20. slot; 21. plug rod. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with 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 of the embodiments; based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0020] Depend on Figure 1-5The utility model includes a mounting head 1 and a presser foot 6. A square columnar inner groove 2 is provided inside the mounting head 1. A through opening is provided at the bottom of the inner groove 2. A lifting block 3 is movably installed inside the inner groove 2. A rod groove 4 is provided at the bottom of the lifting block 3. A connecting rod 5 is fixedly installed on the top of the presser foot 6. The top of the connecting rod 5 extends through the through opening to the inner groove 2 and is movably inserted into the rod groove 4 at the bottom of the lifting block 3. A spring is fixedly connected between the top of the inner wall of the rod groove 4 and the top of the connecting rod 5. 7. A tooth groove 8 is provided on the left side of the lifting block 3, a groove 9 is provided on the left side of the inner wall of the inner groove 2, a bearing 10 is fixedly installed in the groove 9, a rotating tube 11 is fixedly inserted between the inner ring walls of the bearing 10, a gear 12 located in the tooth groove 8 is fixedly installed at one end of the rotating tube 11, a screw hole connected to the groove 9 is provided on the left side of the mounting head 1, an adjusting bolt 13 is threadedly inserted in the screw hole, one end of the adjusting bolt 13 is movably inserted in the rotating tube 11, and the top of the inner wall of the rotating tube 11 is fixedly installed with a gear 12 located in the tooth groove 8. The first slide groove 14 is provided at the top and bottom of the adjusting bolt 13 at one end of the rotating tube 11, and the first slider 15 is fixedly installed at the top and bottom of the adjusting bolt 13 at one end of the rotating tube 11. The two first sliders 15 are respectively located in the corresponding first slide grooves 14 and can slide therein. When adjusting the position height of the presser foot 6, by screwing the adjusting bolt 13 and rotating it with the screw hole, the adjusting bolt 13 will drive the two first sliders 15 at one end thereof to move left and right in the first slide groove 14 on the inner wall of the rotating tube 11. Under the cooperation of the first slider 15 and the first slide groove 14, the rotating tube 11 will rotate together with the rotation of the adjusting bolt 13 between the inner ring wall of the bearing 10, and the rotating tube 11 will then drive the gear 12 to mesh and rotate with the teeth on one side of the inner wall of the tooth groove 8, thereby driving the lifting block 3 to move up and down in the inner groove 2, and then allowing the lifting block 3 to drive the connecting rod 5 and the presser foot 6 to complete the up and down movement, so that the purpose of adjusting the horizontal height of the presser foot 6 can be achieved, so that the presser foot 6 is suitable for fabrics of different thicknesses.

[0021] At the same time, teeth are provided on one side of the inner wall of the tooth groove 8 , and the side wall of the gear 12 is meshedly connected with the teeth on one side of the inner wall of the tooth groove 8 , so that the gear 12 can mesh and rotate normally with the tooth groove 8 .

[0022] In addition, a slot 20 is provided at the top of the connecting rod 5, and an insertion rod 21 is fixedly installed at the top of the inner wall of the rod groove 4. The insertion rod 21 passes through between the springs 7 and is movably inserted into the slot 20 at the top of the connecting rod 5. The insertion rod 21 can make the connecting rod 5 more stable when moving up and down in the rod groove 4.

[0023] In addition, second sliding grooves 18 are opened on both sides of the inner wall of the rod groove 4, and second sliding blocks 19 are fixedly installed on both sides of the outer wall of the connecting rod 5. The two second sliding blocks 19 are respectively located in the corresponding second sliding grooves 18 and can slide therein. With the cooperation of the second sliding blocks 19 and the second sliding grooves 18, the range of up and down movement of the connecting rod 5 in the rod groove 4 can be limited, and the connecting rod 5 can be prevented from escaping from the rod groove 4.

[0024] In addition, a third slide groove 16 is opened on the right side of the inner wall of the inner groove 2, and two rotatable rollers 17 are fixedly installed on the right side of the lifting block 3. The two rollers 17 are both located in the third slide groove 16 and can rotate therein. The rollers 17 are in contact with the inner wall of the third slide groove 16, which can reduce the contact area between the outer wall of the right side of the lifting block 3 and the inner wall of the inner groove 2, so that the lifting block 3 can move up and down smoothly in the inner groove 2.

[0025] In addition, there is a gap between the top and bottom ends of the lifting block 3 and the top and bottom of the inner tank 2, so that space can be reserved for the up and down movement of the lifting block 3.

[0026] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sewing machine presser foot assembly, comprising a mounting head (1) and a presser foot (6), characterized in that: A square column-shaped inner groove (2) is provided inside the mounting head (1), a through opening is provided at the bottom of the inner groove (2), a lifting block (3) is movably installed inside the inner groove (2), a rod groove (4) is provided at the bottom of the lifting block (3), a connecting rod (5) is fixedly installed on the top of the presser foot (6), the top end of the connecting rod (5) passes through the through opening and extends into the inner groove (2) and is movably inserted into the rod groove (4) at the bottom of the lifting block (3), and a spring (7) is fixedly connected between the top of the inner wall of the rod groove (4) and the top end of the connecting rod (5), a tooth groove (8) is provided on the left side of the lifting block (3), a groove (9) is provided on the left side of the inner wall of the inner groove (2), and a bearing (10) is fixedly installed in the groove (9) A rotating tube (11) is fixedly inserted between the inner ring walls of the bearing (10), a gear (12) located in the tooth groove (8) is fixedly installed at one end of the rotating tube (11), a screw hole connected to the groove (9) is opened on the left side of the mounting head (1), an adjusting bolt (13) is threadedly inserted in the screw hole, one end of the adjusting bolt (13) is movably inserted in the rotating tube (11), a first slide groove (14) is opened at the top and bottom of the inner wall of the rotating tube (11), and a first slider (15) is fixedly installed at the top and bottom of one end of the adjusting bolt (13) located inside the rotating tube (11), and the two first sliders (15) are respectively located in the corresponding first slide grooves (14) and can slide therein.

2. A sewing machine presser foot assembly according to claim 1, characterized in that: One side of the inner wall of the tooth groove (8) is provided with teeth, and the side wall of the gear (12) is meshedly connected with the teeth on one side of the inner wall of the tooth groove (8).

3. A sewing machine presser foot assembly according to claim 1, characterized in that: A slot (20) is provided at the top of the connecting rod (5), and an insertion rod (21) is fixedly installed at the top of the inner wall of the rod groove (4). The insertion rod (21) passes through between the springs (7) and is movably inserted into the slot (20) at the top of the connecting rod (5).

4. A sewing machine presser foot assembly according to claim 1, characterized in that: Second sliding grooves (18) are provided on both sides of the inner wall of the rod groove (4), and second sliding blocks (19) are fixedly installed on both sides of the outer wall of the connecting rod (5). The two second sliding blocks (19) are respectively located in the corresponding second sliding grooves (18) and can slide therein.

5. The sewing machine presser foot assembly according to claim 1, characterized in that: A third sliding groove (16) is provided on the right side of the inner wall of the inner groove (2), and two rotatable rollers (17) are fixedly installed on the right side of the lifting block (3), and both rollers (17) are located in the third sliding groove (16) and can rotate therein.

6. A sewing machine presser foot assembly according to claim 1, characterized in that: There is a distance between the top and bottom ends of the lifting block (3) and the top and bottom of the inner tank (2).

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