Sewing machine head

Abstract

This utility model relates to the field of sewing machine technology and discloses a sewing machine head, including a housing with a cavity open at one end. An end cap is provided at the opening of the cavity. A presser foot bar and a needle bar, with their lower ends extending out of the housing, are arranged side-by-side within the cavity. The extended end of the presser foot bar is provided with a presser foot. A presser foot lifting mechanism is provided within the cavity for raising the presser foot. The presser foot lifting mechanism includes an adjusting block on the presser foot bar and a manual presser foot lifting assembly on the inner wall of the cavity. An adjusting assembly for adjusting the presser foot lifting height and pressure is provided at the top of the housing. The adjusting assembly allows for better adjustment of the height the presser foot is raised by the manual presser foot lifting assembly and the pressure the presser foot applies to the fabric. Compared to existing sewing machines where the end cap needs to be removed for presser foot lifting height adjustment, this sewing machine head allows for adjustment without removing the end cap. The adjustment operation is simple and convenient, requiring no special tools such as screwdrivers, which is beneficial for practical use.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, and more specifically, to a sewing machine head. Background Technology

[0002] A sewing machine is a machine that uses one or more sewing threads to create one or more stitches on fabric, allowing one or more layers of fabric to interweave or sew together. A sewing machine mainly consists of four parts: the sewing head, the base, the transmission, and accessories. Among them, the sewing head is the main part of the sewing machine, and it consists of mechanisms for feeding, hooking, taking up the thread, feeding, winding, pressing, and dropping the feed dog.

[0003] Currently, most sewing machines use a presser foot lifting function during the sewing process. The conventional presser foot lifting function is driven by hand. Usually, a manual presser foot lifting component and an adjusting block on the presser foot bar are installed inside the sewing machine head. The operator lifts the presser foot by moving the manual presser foot lifting component to raise the adjusting block. However, in actual use, in order to adjust the height of the presser foot, it is necessary to remove the end cover of the machine head, loosen the adjusting block on the presser foot bar with a screwdriver or other tools, and move it along the presser foot bar to adjust the distance between it and the manual presser foot lifting component. The operation is cumbersome and requires repeated adjustments, which is time-consuming and laborious, and affects the normal operation of the sewing machine. Utility Model Content

[0004] The purpose of this invention is to provide a sewing machine head to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A sewing machine head includes a housing with a cavity open at one end. An end cap is provided at the opening of the cavity. A presser foot bar and a needle bar, with their lower ends extending out of the housing, are arranged side by side in the cavity. The extended end of the presser foot bar is provided with a presser foot. A presser foot lifting mechanism is provided in the cavity for raising the presser foot. The presser foot lifting mechanism includes an adjusting block provided on the presser foot bar and a manual presser foot lifting component provided on the inner wall of the cavity. An adjusting component for adjusting the presser foot lifting height and pressure is provided at the top of the housing.

[0007] Furthermore, the adjustment assembly includes a fixed cylinder extending through the housing into the cavity, a liftable insert rod inserted into the upper end of the presser foot rod, the upper end of the insert rod extending into the fixed cylinder, a pressure adjustment component for adjusting the lifting and lowering of the insert rod to adjust the presser foot pressure, and a height adjustment component for driving the adjustment block to lift and lower along the presser foot rod to adjust the presser foot lifting height.

[0008] Furthermore, the upper end of the presser foot bar is provided with a socket for inserting the insert rod, and a fixing post is provided outside the insert rod and at the upper end. A spring is provided on the insert rod sleeve between the fixing post and the upper end of the presser foot bar.

[0009] The pressure regulating component includes a hand-tightening bolt threaded into the fixed cylinder. The hand-tightening bolt has a first through hole for the insertion rod to be inserted. The hand-tightening bolt presses against the upper end of the fixed column to realize the lifting and lowering of the insertion rod in the insertion hole.

[0010] Furthermore, the bottom wall of the insertion hole is provided with a threaded hole, the insertion rod is provided with a second through hole, the fixing column is provided with a lifting cavity that communicates with the second through hole, and the side wall of the lifting cavity is provided with a sliding groove opposite to the fixing column along the axial direction.

[0011] The height adjustment component includes an adjustment rod that is slidably disposed in the second through hole and whose lower end is threaded into the threaded hole. The lifting cavity is provided with a liftable mounting plate, which is rotatably mounted on the adjustment rod. The side wall of the mounting plate is provided with a mounting plate that extends out of the corresponding slide groove. The mounting plate is fixedly connected to the adjustment block by a connecting rod.

[0012] Furthermore, the upper end of the fixed cylinder extends outward to form a mounting ring, which is fixedly mounted to the housing by screws.

[0013] Furthermore, the bottom of the cavity is provided with a mounting cylinder that penetrates the housing and allows the presser foot rod to pass through. The inner wall of the mounting cylinder is provided with a limiting groove along its radial direction, and the outer wall of the presser foot rod is provided with a limiting block that slides within the limiting groove.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention allows for better adjustment of the height of the presser foot raised by the manual presser foot assembly and the pressure of the presser foot on the fabric through the adjustment component. Compared with existing sewing machines where the end cap needs to be removed when adjusting the presser foot height, this sewing machine head can be adjusted without removing the end cap. Moreover, the adjustment operation is simple and convenient, without the need for special tools such as screwdrivers, which is beneficial for practical use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a sewing machine head according to the present invention.

[0017] Figure 2 This is a schematic diagram of the structure of the adjustment component installed on the presser foot rod in this utility model.

[0018] Figure 3 This is a cross-sectional view of the adjustment component installed on the presser foot rod in this utility model.

[0019] Figure 4 This is a schematic diagram of the structure between the pressure foot rod and the insertion rod in this utility model.

[0020] Figure 5 This is a schematic diagram of the structure of the adjustment block and adjustment rod in this utility model.

[0021] Figure 6 This is a schematic diagram of the structure between the hand-tightening bolt and the fixed cylinder in this utility model.

[0022] The meanings of the labels in the diagram are as follows:

[0023] 10. Housing; 11. Cavity; 20. Presser foot lever; 21. Presser foot; 30. Needle bar; 41. Adjusting block; 42. Manual presser foot lifting assembly; 50. Adjusting assembly;

[0024] 110. Fixing cylinder; 111. Mounting ring; 120. Insert rod; 121. Fixing post; 130. Spring; 140. Hand-tightening bolt; 150. Adjusting rod; 160. Connecting rod; 170. Mounting cylinder;

[0025] 301. Insertion hole; 302. Threaded hole; 311. Second through hole; 312. Slide groove; 321. Limiting block;

[0026] 410. Installation disk; 411. Installation plate;

[0027] 501. First through hole. Detailed Implementation

[0028] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments are merely illustrative of this utility model and are not intended to limit it.

[0029] The following is in conjunction with the appendix Figures 1-6 This embodiment will be described in further detail.

[0030] like Figure 1 As shown, a sewing machine head in this embodiment includes a housing 10, and a cavity 11 with an open end is provided inside the housing 10. An end cap (not shown in the figure) is provided at the opening of the cavity 11. Specifically, the end cap is installed on the housing 10 by screws to seal the cavity 11.

[0031] The cavity 11 contains a presser foot rod 20 and a needle bar 30, both extending out of the housing 10. The extended end of the presser foot rod 20 is fitted with a detachable presser foot 21 via screws. The lower end of the needle bar 30 is fitted with a sewing needle. The cavity 11 contains a presser foot lifting mechanism for raising the presser foot 21. The presser foot lifting mechanism includes an adjusting block 41 on the presser foot rod 20 and a manual presser foot lifting assembly 42 on the inner wall of the cavity 11. The top of the housing 10 contains an adjusting assembly 50 for adjusting the lifting height and pressure of the presser foot 21.

[0032] In this embodiment, the manual presser foot lifting assembly 42 is an existing structure. In actual use, the manual presser foot lifting assembly 42 is used to lift the adjusting block 41 below the adjusting block 41, thereby lifting the presser foot rod 20 and the presser foot 21. When the manual presser foot lifting assembly 42 is reset, the presser foot rod 20 and the presser foot 21 can move down so that the presser foot 21 can press the fabric tightly onto the needle plate.

[0033] In this embodiment, by adjusting the settings of the component 50, the height of the presser foot 21 raised by the manual presser foot lifting component 42 and the pressure of the presser foot 21 pressing the fabric can be adjusted more effectively. Compared with the existing sewing machines, which require the end cap to be removed when adjusting the height of the presser foot 21, the sewing machine head in this embodiment does not need to be removed to perform the adjustment operation. Moreover, the adjustment operation is simple and convenient, without the need for special tools such as screwdrivers, which is beneficial to practical use.

[0034] Combination Figure 2 and Figure 3 As shown, in this embodiment, the adjustment component 50 includes a fixed cylinder 110 that extends through the housing 10 into the cavity 11. Specifically, the top of the cavity 11 has an upper mounting hole that extends through the housing 10, and the fixed cylinder 110 extends through the upper mounting hole into the cavity 11. In order to achieve the fixed installation of the fixed cylinder 110, in this embodiment, the upper end of the fixed cylinder 110 extends outward to form a mounting ring 111, and the mounting ring 111 is fixedly installed on the housing 10 by screws.

[0035] In actual use, in order to realize the lifting and lowering installation of the presser foot rod 20 in the cavity 11, in this embodiment, the bottom of the cavity 11 is provided with a lower mounting hole that penetrates the housing 10. A mounting cylinder 170 is fixedly installed in the lower mounting hole. The presser foot rod 20 is provided through the mounting cylinder 170. In order to restrict the presser foot rod 20 and prevent it from rotating circumferentially in the mounting cylinder 170, in this embodiment, the inner wall of the mounting cylinder 170 is provided with a limiting groove along its radial direction, and the outer wall of the presser foot rod 20 is provided with a limiting block 321 that slides in the limiting groove.

[0036] In this embodiment, a liftable insert rod 120 is inserted into the upper end of the presser foot rod 20. The upper end of the insert rod 120 extends into the fixed cylinder 110. The fixed cylinder 110 is provided with a pressure adjusting component for adjusting the lifting and lowering of the insert rod 120 to adjust the pressure of the presser foot 21. The fixed cylinder 110 is also provided with a height adjusting component for driving the adjusting block 41 to rise and fall along the presser foot rod 20 to adjust the lifting height of the presser foot 21.

[0037] In this embodiment, the lifting height and pressure of the presser foot 21 can be effectively adjusted by using the pressure adjustment component and the height adjustment component, making the operation simple and convenient.

[0038] Combination Figure 4 and Figure 6 As shown, in this embodiment, the upper end of the presser foot rod 20 is provided with a insertion hole 301 for inserting the insertion rod 120. A fixing post 121 is provided outside the insertion rod 120 and at its upper end. The fixing post 121 is coaxial with the insertion rod 120 and its diameter is larger than that of the insertion rod 120, so that its two ends at the upper end form an abutment part. A spring 130 is provided on the insertion rod 120 between the fixing post 121 and the upper end of the presser foot rod 20.

[0039] The pressure regulating component includes a hand-tightening bolt 140 threaded into the fixed cylinder 110. The hand-tightening bolt 140 has a first through hole 501 for the insertion rod 120 to extend into. The hand-tightening bolt 140 presses the upper end of the fixed column 121 to realize the lifting and lowering of the insertion rod 120 in the insertion hole 301.

[0040] In this embodiment, the upper end of the spring 130 abuts against the lower abutment part, and the lower end abuts against the upper end of the presser foot rod 20. Under the action of the spring 130, the upper abutment part contacts the lower end of the hand-tightening bolt 140, causing the presser foot rod 20 to move the presser foot 21 downwards, so that its upper adjusting block 41 contacts the manual presser foot lifting assembly 42. At this time, the presser foot 21 moves downwards to press the fabric on the needle plate. The operator can then adjust the pressing foot by moving the manual presser foot lifting assembly 42 to adjust the adjusting block 41. The lower lifting adjustment block 41 and presser foot rod 20 are adjusted to compress the spring 130, thereby lifting the presser foot 21. It should be noted that when the presser foot assembly 42 is manually lifted to reset, so that the presser foot rod 20 moves the presser foot 21 downward under the action of the spring 130 to press the fabric, the force exerted by the spring 130 on the presser foot rod 20 is the pressure of the presser foot 21. Therefore, when it is necessary to adjust the pressure of the presser foot 21, the degree of compression of the spring 130 can be adjusted.

[0041] In this embodiment, the above-described structure allows the presser foot 21 to move up and down within the fixed cylinder 110 by turning the hand-tightening bolt 140 when pressing the fabric, thereby enabling its lower end to press against the upper end of the fixed post 121, thus allowing the insertion rod 120 to extend and retract within the insertion hole 301, thereby adjusting the compression degree of the spring 130. The operation is simple and convenient.

[0042] In this embodiment, in order to adjust the lifting height of the presser foot 21, combined with Figure 5 As shown, in this embodiment, the bottom wall of the insertion hole 301 is provided with a threaded hole 302, the insertion rod 120 is provided with a second through hole 311, the fixing column 121 is provided with a lifting cavity communicating with the second through hole 311, and the side wall of the lifting cavity is provided with a sliding groove 312 opposite to the axial direction of the fixing column 121.

[0043] The height adjustment component includes an adjustment rod 150 that is slidably disposed in the second through hole 311 and whose lower end is threaded into the threaded hole 302. The lifting cavity is provided with a liftable mounting plate 410, which is rotatably mounted on the adjustment rod 150. The side wall of the mounting plate 410 is provided with a mounting plate 411 that extends out of the corresponding slide groove 312. The mounting plate 411 is fixedly connected to the adjustment block 41 by a connecting rod 160.

[0044] In this embodiment, the adjusting rod 150 passes through the mounting plate 410, and the mounting plate 410 is rotatably mounted on the adjusting rod 150 via a bearing. Since the connecting rod 160 is fixedly connected to the adjusting block 41 and the mounting plate 411, and the lower end of the adjusting rod 150 is threaded into the threaded hole 302, the adjusting block 41, the mounting plate 410, and the presser foot rod 20 are relatively fixed to form a whole. This allows the presser foot 21 to be raised when the manual presser foot assembly 42 lifts the adjusting block 41.

[0045] In actual use, since the presser foot rod 20 is restricted and cannot rotate circumferentially, the adjusting rod 150 is turned to move it up and down along the threaded hole 302, thereby driving the mounting plate 410 to move up and down in the lifting cavity. This allows the adjusting block 41 to move up and down along the presser foot rod 20, so that the distance between the adjusting block 41 and the manual presser foot lifting assembly 42 can be adjusted, thereby adjusting the height of the presser foot 21 raised by the manual presser foot lifting assembly 42. The adjustment operation is simple and convenient.

[0046] It should be noted that, in order to install the mounting plate 410 in the lifting cavity, the lifting cavity is designed with an opening at the top, and a sealing plate is welded to the opening to block it, thereby forming the insertion rod 120 in this embodiment.

[0047] In summary, the above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall fall within the scope of the patent of the present utility model.

Claims

1. A sewing machine head, comprising a housing (10), wherein a cavity (11) with one end open is provided inside the housing (10), and an end cap is provided at the opening of the cavity (11), characterized in that: Inside the cavity (11), there are a presser foot rod (20) and a needle rod (30) with their lower ends extending out of the housing (10). The extended end of the presser foot rod (20) is provided with a presser foot (21). Inside the cavity (11), there is a presser foot lifting mechanism for lifting the presser foot (21). The presser foot lifting mechanism includes an adjusting block (41) on the presser foot rod (20) and a manual presser foot lifting assembly (42) on the inner wall of the cavity (11). At the top of the housing (10), there is an adjusting assembly (50) for adjusting the lifting height and pressure of the presser foot (21).

2. A sewing machine head according to claim 1, characterized in that: The adjustment assembly (50) includes a fixed cylinder (110) that extends through the housing (10) into the cavity (11). A liftable insert rod (120) is inserted into the upper end of the presser foot rod (20). The upper end of the insert rod (120) extends into the fixed cylinder (110). The fixed cylinder (110) is provided with a pressure adjusting component for adjusting the lifting of the insert rod (120) to adjust the pressure of the presser foot (21). The fixed cylinder (110) is also provided with a height adjusting component for driving the adjusting block (41) to lift along the presser foot rod (20) to adjust the lifting height of the presser foot (21).

3. A sewing machine head according to claim 2, characterized in that: The upper end of the presser foot rod (20) is provided with a socket (301) for inserting the insert rod (120). A fixing post (121) is provided outside the insert rod (120) and at the upper end. A spring (130) is provided on the insert rod (120) between the fixing post (121) and the upper end of the presser foot rod (20). The pressure regulating component includes a hand-tightening bolt (140) threaded into the fixed cylinder (110). The hand-tightening bolt (140) has a first through hole (501) for the insertion rod (120) to extend into. The hand-tightening bolt (140) presses the upper end of the fixed column (121) to realize the lifting and lowering of the insertion rod (120) in the insertion hole (301).

4. A sewing machine head according to claim 3, characterized in that: The bottom wall of the insertion hole (301) is provided with a threaded hole (302), the insertion rod (120) is provided with a second through hole (311), the fixed column (121) is provided with a lifting cavity that communicates with the second through hole (311), and the side wall of the lifting cavity is provided with a sliding groove (312) opposite to the axial direction of the fixed column (121). The height adjustment component includes an adjustment rod (150) that is slidably disposed in the second through hole (311) and whose lower end is threaded into the threaded hole (302). The lifting cavity is provided with a lifting mounting plate (410), which is rotatably mounted on the adjustment rod (150). The side wall of the mounting plate (410) is provided with a mounting plate (411) that extends out of the corresponding slide groove (312). The mounting plate (411) is fixedly connected to the adjustment block (41) by a connecting rod (160).

5. A sewing machine head according to claim 2, characterized in that: The upper end of the fixed cylinder (110) extends outward to form a mounting ring (111), which is fixedly mounted on the housing (10) by screws.

6. A sewing machine head according to claim 1, characterized in that: The bottom of the cavity (11) is provided with an installation cylinder (170) that passes through the housing (10) and allows the presser foot rod (20) to pass through. The inner wall of the installation cylinder (170) is provided with a limiting groove along its radial direction, and the outer wall of the presser foot rod (20) is provided with a limiting block (321) that slides in the limiting groove.

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