A sewing machine

Abstract

The utility model provides a sewing machine belongs to sewing machine technical field. It has solved the problem of easy wearing and tearing between existing swing frame and needle bar. The sewing machine, including the casing, horizontal wear in the casing swing axle, fixedly connected in swing axle one end swing frame and vertical wear in swing frame needle bar, be provided with the positioning structure of swing frame upper portion and lower portion can be positioned to swing frame on casing, swing frame is integral type structure, swing frame upper portion and lower portion all are along vertical direction and are opened to limit hole, and the position of two limit holes is opposite, two limit holes in swing frame all wear the guide cylinder that is cylindrical, the lower extreme of needle bar passes two guide cylinders in proper order, the inner wall of two guide cylinders all are opened to recessed and are circular annular and are used for accommodating lubricating oil lubricating groove. The sewing machine has the advantages of not easy wearing and tearing.

Description

Technical Field

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

[0002] A sewing machine is a machine that sews fabric together with thread. It includes a needle bar mechanism, thread take-up mechanism, feed mechanism, thread hooking mechanism, pressing mechanism, thread winding device, and lubrication device. Sewing machines can be classified according to their structure or sewing process into flatbed sewing machines, chain stitch machines, overlock machines, buttonhole machines, and bag sealing machines, among others.

[0003] For example, the applicant designed a sewing machine reinforced with a swing frame and applied for a Chinese patent with application number 202121506054.7 and publication number CN215051189U. This swing frame reinforced sewing machine includes a machine housing, a swing shaft passing through the housing, a swing frame fixedly connected to the swing shaft, the swing shaft driving the swing frame to swing around the swing shaft, a lower positioning member fixedly connected to the lower end of the swing frame, a lower positioning surface and a lower pressure plate for axially positioning the lower positioning member on the machine housing, and an upper positioning member fixedly connected to the upper end of the swing frame. The upper end of the positioning component has a positioning part, which has a positioning surface one and a positioning surface two facing opposite directions. Both positioning surfaces one and two are perpendicular to the swing axis. The positioning part has a swing hole that passes through positioning surfaces one and three. The swing hole is arc-shaped and arranged around the swing axis. A positioning rod passes through the swing hole. One end of the positioning rod is fixed to the machine housing. The outer side of the other end of the positioning rod has a protruding abutment part that is opposite to positioning surface two. The upper end of the machine housing has an upper positioning surface that is opposite to positioning surface one. Positioning surface one abuts against the upper positioning surface, and the abutment part abuts against positioning surface one. In this sewing machine reinforced with a swing frame, the lower pressure plate, the lower positioning surface, and the positioning rod achieve axial positioning of the swing frame and the upper positioning component, thereby improving the swing stability of the swing frame.

[0004] In the aforementioned sewing machine reinforced with a swing frame, the needle bar used for sewing is vertically inserted into the swing frame. After the swing frame is axially positioned, friction easily occurs between the needle bar and the swing frame during the up-and-down movement of the needle bar, causing wear. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a sewing machine that solves the problem of easy wear between the existing swing frame and needle bar.

[0006] The objective of this utility model can be achieved through the following technical solutions: A sewing machine includes a housing, a horizontally inserted swing shaft within the housing, a swing frame fixed to one end of the swing shaft, and a needle bar vertically inserted within the swing frame. The housing is provided with a positioning structure capable of axially positioning the upper and lower parts of the swing frame. The swing frame is characterized by being an integral structure, with vertically extending limit holes through both the upper and lower parts of the swing frame, the two limit holes being directly opposite each other. Cylindrical guide cylinders are inserted into each of the two limit holes of the swing frame. The lower end of the needle bar passes sequentially through the two guide cylinders. The inner walls of the two guide cylinders are provided with recessed, annular lubrication grooves for accommodating lubricating oil.

[0007] In this sewing machine, a guide cylinder is installed in the limiting holes at the upper and lower parts of the swing frame, and the needle bar passes through both guide cylinders. The two guide cylinders guide the axial movement of the needle bar and limit its radial movement, preventing the needle bar from moving around and directly rubbing against the swing frame, thus avoiding wear. Furthermore, by creating lubrication grooves on the inner walls of the guide cylinders and filling them with lubricating oil, the needle bar can be lubricated during axial movement relative to the guide cylinders, further reducing friction and wear.

[0008] In the aforementioned sewing machine, the guide cylinder within the lower limiting hole of the swing frame has two ends extending outward from the corresponding ports of the limiting hole. The outer side of the upper end of the guide cylinder has an outwardly protruding, annular flange, and the lower end face of the flange abuts against the upper port of the corresponding limiting hole. The position of the guide cylinder is limited by the flange abutting against the port, ensuring a smooth lubrication effect.

[0009] In the aforementioned sewing machine, an annular groove is provided on the outer side of the upper end of the guide cylinder, and the groove is located below the aforementioned protruding edge. This groove can also be used to store lubricating oil, thereby lubricating the guide cylinder and the swing frame and reducing wear.

[0010] In the aforementioned sewing machine, the outer side of the lower end of the guide cylinder has a tapered surface, and the diameter of the tapered surface gradually increases from bottom to top. The tapered surface facilitates the insertion of the guide cylinder into the limiting hole.

[0011] In the aforementioned sewing machine, there are several lubrication grooves distributed at intervals along the axial direction of the guide cylinder. Lubricating oil can be placed in each of the lubrication grooves to provide multi-point lubrication for the axial movement of the needle bar, further reducing wear.

[0012] Compared with existing technologies, this sewing machine uses two guide cylinders to guide the axial movement of the needle bar and limit its radial movement, preventing the needle bar from moving around and directly rubbing against the swing frame, thus avoiding wear. Furthermore, by creating lubrication grooves on the inner walls of the guide cylinders and filling them with lubricating oil, the needle bar can be lubricated during axial movement relative to the guide cylinders, further reducing friction and wear. Attached Figure Description

[0013] Figure 1 This is a structural diagram of the sewing machine when the front cover is removed.

[0014] Figure 2 This is a structural diagram of the sewing machine when the casing is removed.

[0015] Figure 3 This is a cross-sectional view of the needle bar in this sewing machine.

[0016] In the figure, 1 is the housing; 2 is the swing shaft; 3 is the swing frame; 3a is the limiting hole; 4 is the needle bar; 5 is the positioning structure; 6 is the guide cylinder; 6a is the lubrication groove; 6b is the raised edge; 6c is the groove; and 6d is the conical surface. Detailed Implementation

[0017] 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.

[0018] like Figure 1 and Figure 2 As shown, this sewing machine includes a housing 1, a swing shaft 2 horizontally inserted within the housing 1, a swing frame 3 fixed to one end of the swing shaft 2, and a needle bar 4 vertically inserted within the swing frame 3. The housing 1 is provided with a positioning structure 5 capable of axially positioning the upper and lower parts of the swing frame 3. In this embodiment, the positioning structure 5 is the same as the scheme in the applicant's prior art, including a lower positioning surface and a lower pressure plate at the bottom, and a positioning rod at the top, to achieve axial positioning of the upper and lower parts of the swing frame 3 on the swing shaft 2, preventing axial shaking or movement of the swing frame 3. The difference here is that the swing frame 3 in this sewing machine is an integral structure, and the positioning rod at the top directly passes horizontally through the swing frame 3, instead of passing through the upper positioning member as in the prior art.

[0019] like Figure 3 As shown, the upper and lower parts of the swing frame 3 are both vertically oriented with limiting holes 3a, and the two limiting holes 3a are directly opposite each other. A cylindrical guide cylinder 6 is inserted into each of the two limiting holes 3a of the swing frame 3. The lower end of the needle rod 4 passes through the two guide cylinders 6 in sequence. The inner walls of the two guide cylinders 6 are provided with several recessed annular lubrication grooves 6a for accommodating lubricating oil, and the several lubrication grooves 6a are distributed at intervals along the axial direction of the guide cylinders 6.

[0020] In this embodiment, the guide cylinders 6 within the two limiting holes 3a have identical structures. The upper ends of both guide cylinders 6 extend through the upper ports of the two limiting holes 3a. The outer sides of the upper ends of both guide cylinders 6 have outwardly protruding, annular flanges 6b, with the lower end face of the flanges 6b abutting against the corresponding upper ports of the limiting holes 3a. Annular grooves 6c are formed on the outer sides of the upper ends of both guide cylinders 6, and the grooves 6c are located below the flanges 6b. The outer sides of the lower ends of both guide cylinders 6 have tapered surfaces 6d, with the diameter of the tapered surfaces 6d gradually increasing from bottom to top. The difference between the two guide cylinders 6 is that the lower end of the upper guide cylinder 6 does not extend through the lower port of the upper limiting hole 3a, while the lower end of the lower guide cylinder 6 extends through the lower port of the lower limiting hole 3a.

[0021] In this sewing machine, a guide cylinder 6 is installed in the limiting holes 3a at the upper and lower parts of the swing frame 3, and the needle bar 4 passes through the two guide cylinders 6. The two guide cylinders 6 guide the axial movement of the needle bar 4 and limit its radial movement, preventing the needle bar 4 from moving around and directly rubbing against the swing frame 3, thus avoiding wear. Furthermore, by opening a lubrication groove 6a on the inner wall of the guide cylinder 6 and filling it with lubricating oil, the needle bar 4 can be lubricated when moving axially relative to the guide cylinder 6, further reducing friction and wear.

[0022] 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, comprising a housing (1), a swing shaft (2) horizontally inserted within the housing (1), a swing frame (3) fixedly connected to one end of the swing shaft (2), and a needle bar (4) vertically inserted within the swing frame (3), wherein the housing (1) is provided with a positioning structure (5) capable of axially positioning the upper and lower parts of the swing frame (3), characterized in that, The swing frame (3) is an integral structure. The upper and lower parts of the swing frame (3) are vertically oriented with limiting holes (3a) and the two limiting holes (3a) are directly opposite each other. The two limiting holes (3a) of the swing frame (3) are each provided with a cylindrical guide cylinder (6). The lower end of the needle bar (4) passes through the two guide cylinders (6) in sequence. The inner walls of the two guide cylinders (6) are provided with a recessed annular lubrication groove (6a) for accommodating lubricating oil.

2. A sewing machine according to claim 1, wherein The guide cylinder (6) inside the lower limiting hole (3a) of the swing frame (3) extends out of the two ports of the corresponding limiting hole (3a). The outer side of the upper end of the guide cylinder (6) has an outwardly protruding annular flange (6b), and the lower end face of the flange (6b) abuts against the upper port of the corresponding limiting hole (3a).

3. A sewing machine according to claim 2, wherein The guide cylinder (6) has an annular groove (6c) on the outer side of its upper end, and the groove (6c) is located below the aforementioned protrusion (6b).

4. A sewing machine according to claim 1, 2, or 3, characterized in that, The outer side of the lower end of the guide cylinder (6) has a conical surface (6d), and the diameter of the conical surface (6d) gradually increases from bottom to top.

5. A sewing machine according to claim 1, 2, or 3, characterized in that, The number of lubrication grooves (6a) is several and they are distributed at intervals along the axial direction of the guide cylinder (6).

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