A one-piece cast sewing machine head

Abstract

The utility model relates to sewing machine head, more specifically relates to a kind of integral casting type sewing machine head, to avoid the vibration and noise produced in the process of high-speed operation caused by the matching precision not enough in the process of assembly of cover type head, using following scheme: including head body, the rear end of head body is provided with mounting hole, the back and front two sides in the inside of head body are respectively provided with first shaft hole and second shaft hole, first shaft hole and second shaft hole are located on same axis, operating port on the side wall of head body is provided with to the axis. The sewing machine head of integral casting is used, reduces the matching error generated by butt joint assembly due to cover type split structure, guarantees the installation precision of head internal components from the structural root.

Description

Technical Field

[0001] This utility model relates to a sewing machine head, and more specifically, to an integrally cast sewing machine head. Background Technology

[0002] In the field of sewing machine manufacturing and application, the sewing head, as the core transmission and execution component, directly determines the sewing machine's operational stability, noise level, and stitch quality through its structural design and assembly precision. Insufficient fitting precision during the assembly process of an open-top sewing head leads to vibration and noise during high-speed operation. Under high-speed sewing machine operation, these assembly precision defects are further amplified: on the one hand, imprecise fit between the shaft system and components causes severe mechanical vibration, not only shortening the service life of internal parts but also transmitting it through the machine body to the worktable, affecting the stability of sewing operations; on the other hand, abnormal friction and collision of components during vibration generate significant operating noise, failing to meet the requirements of modern industrial production for a low-noise environment. Utility Model Content

[0003] This utility model provides an integrally cast sewing machine head to improve the defects of open-type sewing machine heads.

[0004] The above objectives are achieved through the following technical solutions:

[0005] An integrally cast sewing machine head includes a head body, a mounting hole at the rear end of the head body, a first shaft hole and a second shaft hole respectively on the left and right sides inside the head body, the first shaft hole and the second shaft hole are located on the same axis, and an operating port facing the axis is provided on the side wall of the head body.

[0006] The machine head body is integrally connected with a perforated baffle, and the holes on the perforated baffle allow the shafts on the first shaft hole and the second shaft hole to pass through.

[0007] The perforated baffle coincides with the axis.

[0008] The operating ports include a first side port, a second side port, and a third side port, which are arranged on the side wall of the machine head body and distributed from back to front, with the first side port facing the first shaft hole.

[0009] The side length of the second side opening occupies four-fifths of the length of the nose section.

[0010] The operating ports include a first side port, a second side port, and a third side port, which are arranged on the side wall of the machine head body and distributed from back to front. The first side port is located on the rear side of the perforated baffle and faces the first shaft hole.

[0011] The shaft is provided with an annular groove. When the shaft passes through the mounting hole from back to front and the rear part of the shaft enters the machine head body, the annular groove can be exposed from the operating port.

[0012] It also includes a base that can be detachably connected to the machine head body, and a pin fixed to the upper end of the base, the diameter of which is smaller than the width of the annular groove.

[0013] The machine head body has threaded holes, and the base can be detachably connected to the machine head body by screwing screws into the threaded holes.

[0014] The shaft is provided with an annular groove. When the shaft passes through the mounting hole from back to front and the rear part of the shaft enters the machine head body, the annular groove can be exposed from the second side opening and / or the third side opening.

[0015] The beneficial effects of this utility model of an integrally cast sewing machine head are as follows:

[0016] The sewing machine head is made of a single piece of cast iron, which reduces the fitting errors caused by the docking assembly of the split structure. This ensures the consistency of the installation benchmarks of the internal components of the machine head from the structural source. By designing mounting holes and shaft holes, radial offset during shaft insertion is effectively avoided, ensuring the straightness of the shaft. The assembly path design of the shaft parts on the side opening allows the shaft parts to be accurately fitted during shaft pushing.

[0017] The integrated machine head body has higher structural rigidity and integrity, which greatly enhances the support strength compared with the split structure and can effectively suppress the deformation of the shell during high-speed operation; the internal integrated baffle structure not only provides stable support for the shaft, but also separates the internal space of the machine head to avoid mutual interference and collision of parts during operation.

[0018] The side opening and the working space of the front and rear mounting holes do not require complicated tools. The sewing machine head thread holder can be used directly to assist in the shaft feeding, which reduces the assembly difficulty and tool requirements and improves the production assembly efficiency of a single workstation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an integrally cast sewing machine head according to the present invention;

[0020] Figure 2 A cross-sectional view of a one-piece cast sewing machine head;

[0021] Figure 3 The shaft enters the annular groove, first side opening, second side opening, and third side opening of the machine head body.

[0022] Location diagram;

[0023] Figure 4 A schematic diagram of the shaft and annular groove;

[0024] Figure 5 This is a schematic diagram of the sewing machine head thread holder.

[0025] In the figure: 1. Head body; 2. Mounting hole; 3. First shaft hole; 4. Perforated baffle; 5. Second shaft hole; 6. First side opening; 7. Second side opening; 8. Third side opening; 9. Shaft; 10. Annular groove; 11. Base; 12. Insert post. Detailed Implementation

[0026] A one-piece cast sewing machine head includes a one-piece cast head body 1, with a mounting hole 2 at each of the front and rear ends of the head body 1. A first shaft hole 3 and a second shaft hole 5 are respectively provided on the front and rear sides inside the head body 1, and the two mounting holes 2, the first shaft hole 3, and the second shaft hole 5 are coaxially aligned. An operating opening facing the axis is provided on the side wall of the head body 1.

[0027] Among them, the mounting hole 2 at the rear end is the initial entry point of the shaft 9, which pushes the shaft 9 forward. The operating port is the assembly entry point for shaft system parts, which are installed on the shaft during the pushing process. Both the mounting hole 2 and the operating port can provide installation positions for the tool, which is used to assist in the installation of the shaft 9 or shaft system parts.

[0028] Among them, the two mounting holes 2 are also the bearing insertion inlets. Depending on the specific bearing model, corresponding bearing positioning steps can be set on the inner wall of the machine head body 1 to limit the axial position of the bearing and ensure the rotational stability of the shaft.

[0029] A guide groove can be set inside the head body 1 to push the shaft 9 forward, which can prevent radial offset when the shaft is inserted and ensure the straightness of the shaft. For example, the mounting hole 2 on the rear side can be used as a guide groove.

[0030] In a further optimized design, a perforated baffle 4 is integrally connected within the machine head body 1. The holes in the perforated baffle 4 allow the shafts on the first shaft hole 3 and the second shaft hole 5 to pass through. The perforated baffle 4 is cast as a single unit, serving both as a support structure for the shaft 9 and as a partition separating the internal space of the machine head body 1 to prevent interference between parts during operation. The axis of the holes in the perforated baffle 4 coincides with the axis of the mounting hole 2.

[0031] To further explain, the operating ports include a first side port 6, a second side port 7, and a third side port 8, which are arranged sequentially from back to front on the longitudinal wall of the right end of the machine head body 1. The first side port 6 is located behind the perforated baffle 4 and faces the first shaft hole 3. The side length of the second side port 7 occupies four-fifths of the length of the machine head body 1. The first side port 6 serves as an observation port for the shaft 9 as it enters the machine head body 1, allowing for inspection of whether the shaft 9 has shifted, and also facilitates insertion into the rear mounting hole 2, thus providing guidance. As the shaft 9 gradually enters the machine head body 1, less and less of it protrudes from the rear of the machine head body 1, reducing the gripping distance. In particular, once the rear of the shaft 9 is completely inside the machine head body 1, it becomes difficult to move it further forward. To solve this problem, an annular groove 10 is provided on the shaft 9. When the shaft 9 passes through the mounting hole 2 from back to front, and the rear of the shaft 9 enters the machine head body 1, the annular groove 10 can protrude from the left side of the second side port 7. By placing a tool in the annular groove 10, the shaft 9 can be dragged further to the right.

[0032] This tool is a sewing machine head thread holder, comprising a base 11 detachably connected to the machine head body 1 with screws, and a pin 12 fixed to the upper end of the base 11. The diameter of the pin 12 is smaller than the width of the annular groove 10, so that the pin 12 is just inserted into the annular groove 10. By holding the base 11, the bottom of the shaft 9 is moved forward by using the pin 12. Of course, the tool can also be inserted and moved by using the third side opening 8, depending on the number and position of the annular grooves 10 on the shaft 9.

[0033] This invention integrates the sewing machine head body 1 into a single casting, forming various holes and openings for the installation of the shaft 9 and related parts. This avoids the problems of insufficient fitting accuracy and vibration during high-speed operation that can occur with open-type sewing machine heads. During installation, the shaft is inserted from the rear, and when installing the fixed shaft parts, the parts are placed in from the side first. This way, the shaft parts follow the shaft to the designated position and are secured. The integral casting eliminates the fitting errors of a split structure, the side assembly ensures centering accuracy, and the strengthened support structure solves the vibration and noise generated during operation, making the sewing machine run more stably and improving the quality of the sewing stitches. In the actual product, the sewing machine head is formed using an integrated casting process and then machined, deburred, and polished to become the finished product. During assembly, shaft-type parts are first inserted through the mounting holes 2 on the rear side of the sewing head body 1. The shaft components to be assembled are then placed into the first to third side openings and inserted onto the shaft 9 during insertion. Next, using tools, the parts inserted onto the shaft are pushed to the designated stepped position inside the sewing head body 1 through the two mounting holes 2 and the first to third side openings. Finally, the bearing is inserted into the shaft 9 through the front and rear mounting holes 2 from the beginning and end, and then pushed into the designated bearing seat position and secured using tools. This design ensures the feasibility of shaft component installation while avoiding vibration and noise problems that occur during high-speed operation of a split-type sewing head after shaft component assembly, significantly improving the stability of the sewing needle.

Claims

1. A one-piece cast sewing machine head, characterized in that, The machine head body includes a mounting hole at its rear end. The front and rear sides of the machine head body are respectively provided with a first shaft hole and a second shaft hole, which are located on the same axis. An operating port facing the axis is provided on the side wall of the machine head body.

2. The integral cast sewing machine head according to claim 1, characterized in that, The machine head body is integrally connected with a perforated baffle, and the holes on the perforated baffle allow the shafts on the first shaft hole and the second shaft hole to pass through.

3. The integral cast sewing machine head according to claim 2, characterized in that, The perforated baffle coincides with the axis.

4. The integral cast sewing machine head according to claim 1, characterized in that, The operating ports include a first side port, a second side port, and a third side port, which are arranged on the side wall of the machine head body and distributed from back to front, with the first side port facing the first shaft hole.

5. The integral cast sewing machine head according to claim 4, characterized in that, The side length of the second side opening occupies four-fifths of the length of the nose section.

6. The integral cast sewing machine head according to claim 2, characterized in that, The operating ports include a first side port, a second side port, and a third side port, which are arranged on the side wall of the machine head body and distributed from back to front. The first side port is located on the rear side of the perforated baffle and faces the first shaft hole.

7. The integral cast sewing machine head according to any one of claims 1 to 6, characterized in that, The shaft is provided with an annular groove. When the shaft passes through the mounting hole from back to front and the rear part of the shaft enters the machine head body, the annular groove can be exposed from the operating port.

8. The integral cast sewing machine head according to claim 7, characterized in that, It also includes a base that can be detachably connected to the machine head body, and a pin fixed to the upper end of the base, the diameter of which is smaller than the width of the annular groove.

9. The integral cast sewing machine head according to claim 8, characterized in that, The machine head body has threaded holes, and the base can be detachably connected to the machine head body by screwing screws into the threaded holes.

10. The integral cast sewing machine head according to claim 4, characterized in that, The shaft is provided with an annular groove. When the shaft passes through the mounting hole from back to front and the rear part of the shaft enters the machine head body, the annular groove can be exposed from the second side opening and / or the third side opening.

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