Sewing machine double cam convenient to install

Abstract

The utility model discloses a sewing machine double cam convenient to install, which relates to the technical field of sewing machines and comprises a sewing machine body and a cam fixing device. A mounting frame is fixedly connected to the interior of the sewing machine body, two transmission shafts are rotatably connected to the interior of the mounting frame, large cams are fixedly connected to the left ends of the two transmission shafts, small cams are fixedly connected to the surfaces of the two large cams, and three through holes are formed in the surface of each large cam; the cam fixing device comprises a connecting plate, a dismounting pressing rod, a cylindrical fixing clamping block and a spring, the connecting plate is slidably connected to the interior of the transmission shaft, the dismounting pressing rod is slidably connected to the interior of the transmission shaft, and the lower end of the dismounting pressing rod is fixedly connected to the right end of the connecting plate. And the large cam can be replaced by pressing the dismounting and mounting pressing rod with fingers, the convenience of dismounting and mounting the large cam by a user is improved, and the practicability of the large cam is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a double cam for a sewing machine which is convenient to install. Background Art

[0002] Sewing machines are widely used in the garment processing industry. A sewing machine is a machine that uses one or more sewing bottom threads to form one or more stitches on the sewing material, so as to interweave or stitch together one or more layers of sewing materials. The sewing process of a sewing machine is actually a process in which the feed dog plate, the presser foot and the sewing needle cooperate to feed and stitch. When starting to sew, the fabric is placed under the presser foot to be sewn. First, the presser foot descends to contact and press the fabric, and the feed dog plate is lifted to the bottom surface of the fabric. The presser foot and the feed dog plate move relatively synchronously to bite the fabric. At the same time, the sewing needle reaches the surface of the fabric synchronously with the presser foot, and the sewing needle pierces the fabric with the upper thread and makes a knotting action with the lower thread.

[0003] The currently disclosed patent: CN217536349U discloses a double-cam feed mechanism of a sewing machine. By adopting the synchronous driving mode of double cams to control the up-and-down and front-and-back swing of the feed dog mounting frame, there is no need to add a guiding structure, which simplifies the feed structure, reduces the production cost of the equipment, improves the assembly efficiency of the sewing machine, and at the same time, through the simultaneous and same-direction rotation of the double cams, the stability of the up-and-down movement and the movement of the feed dog plate is ensured, and the sewing quality of the product is improved.

[0004] Based on the above search, the following problems exist in the use of the above patent: The double-cam feed mechanism ensures the stability of the up-and-down movement and the movement of the feed dog plate through the simultaneous and same-direction rotation of the double cams, and improves the sewing quality of the product. However, the cam is fixedly installed inside the sewing machine through bolts. Due to the narrow space inside the sewing machine, it is not convenient for the user to rotate the bolts with a screwdriver. When the user needs to replace the cam, it affects the convenience of the user to disassemble and assemble the cam, and reduces the practicability of the cam. Content of the Utility Model

[0005] The purpose of the present utility model is to at least solve one of the technical problems existing in the prior art, and provide a double cam for a sewing machine which is convenient to install, which can solve the problem that the cam is fixedly installed inside the sewing machine through bolts. Due to the narrow space inside the sewing machine, it is not convenient for the user to rotate the bolts with a screwdriver. When the user needs to replace the cam, it affects the convenience of the user to disassemble and assemble the cam, and reduces the practicability of the cam.

[0006] To achieve the above object, the present utility model provides the following technical solutions: A double cam for a sewing machine that is easy to install, comprising a sewing machine body and a cam fixing device; an installation frame is fixedly connected inside the sewing machine body, two transmission shafts are rotatably connected inside the installation frame, large cams are fixedly connected to the left ends of the two transmission shafts, small cams are fixedly connected to the surfaces of the two large cams, and three through holes are provided on the surfaces of the two large cams; the cam fixing device includes a connecting plate, a disassembly and assembly pressing rod, a cylindrical fixing block and a spring, the connecting plate is slidably connected inside the transmission shaft, the disassembly and assembly pressing rod is slidably connected inside the transmission shaft, the lower end of the disassembly and assembly pressing rod is fixedly connected to the right end of the connecting plate, the upper end of the disassembly and assembly pressing rod extends to the outside of the transmission shaft, a cylindrical fixing block is slidably connected inside the transmission shaft, a spring is fixedly connected to the bottom of the cylindrical fixing block, the lower end of the spring is fixedly connected to the inner wall of the transmission shaft, and the left end of the connecting plate is fixedly connected to the lower end of the cylindrical fixing block.

[0007] Preferably, first gears are fixedly connected to the right ends of the two transmission shafts.

[0008] Preferably, a support frame is fixedly connected inside the sewing machine body, and a rotating rod is rotatably sleeved inside the support frame.

[0009] Preferably, a second gear is fixedly connected to the left end of the rotating rod, and the second gear is meshed with both of the first gears.

[0010] Preferably, the upper end of the cylindrical fixing block extends to the outside of the transmission shaft.

[0011] Preferably, a fixing card slot is provided inside the large cam, and the upper end of the cylindrical fixing block is slidably clamped inside the fixing card slot.

[0012] Compared with the prior art, the beneficial effects of the present utility model are:

[0013] 1. For this double cam for a sewing machine that is easy to install, after the user releases the disassembly and assembly pressing rod, the spring can release its elastic force and push the cylindrical fixing block to slide upward and be clamped inside the fixing card slot, thus completing the installation of the large cam. Through this installation method, the user no longer needs to rotate bolts with a screwdriver, and can replace the large cam by pressing the disassembly and assembly pressing rod with a finger, which improves the convenience of the user for disassembling and assembling the large cam and enhances the practicality of the large cam. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The following further illustrates the present utility model in conjunction with the drawings and embodiments:

[0015] Figure 1 It is a schematic diagram of the overall structure of a double cam for a sewing machine that is easy to install according to the present utility model;

[0016] Figure 2Schematic diagram of the internal structure of the sewing machine body of the present utility model;

[0017] Figure 3 Schematic diagram of the surface structure of the large cam of the present utility model;

[0018] Figure 4 Schematic cross-sectional structure diagram of the transmission shaft of the present utility model.

[0019] Reference numerals: 1, sewing machine body; 2, mounting bracket; 3, transmission shaft; 4, first gear; 5, support frame; 6, rotating rod; 7, second gear; 8, large cam; 9, small cam; 10, through hole; 11, connecting plate; 12, disassembly and assembly pressure rod; 13, cylindrical fixing block; 14, spring; 15, fixing card slot. Detailed implementation manners

[0020] This part will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the drawings. The function of the drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but it cannot be understood as a limitation on the protection scope of the present utility model.

[0021] In the description of the present utility model, it should be understood that for the orientation description, such as the upper, lower, front, rear, left, right, etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation on the present utility model.

[0022] In the description of the present utility model, greater than, less than, exceeding, etc. are understood as not including the number itself, and above, below, within, etc. are understood as including the number itself. If the first and second are described only for the purpose of distinguishing technical features, it cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0023] In the description of the present utility model, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.

[0024] Please refer to Figures 1-4, the present utility model provides a technical solution: a double cam for a sewing machine that is easy to install, including a sewing machine body 1 and a cam fixing device. Inside the sewing machine body 1, there is a fixedly connected mounting frame 2. Inside the mounting frame 2, there are two transmission shafts 3 rotatably connected. At the right ends of the two transmission shafts 3, there are fixedly connected first gears 4. Inside the sewing machine body 1, there is a fixedly connected support frame 5. Inside the support frame 5, there is a rotatably sleeved rotating rod 6. At the left end of the rotating rod 6, there is a fixedly connected second gear 7. The second gear 7 is meshed with both of the two first gears 4. At the left ends of the two transmission shafts 3, there are fixedly connected large cams 8. On the surfaces of the two large cams 8, there are fixedly connected small cams 9. On the surfaces of the two large cams 8, there are three through holes 10 opened.

[0025] When the sewing machine body 1 is in use, the rotating rod 6 can be driven to rotate by a driving device. When the rotating rod 6 rotates, it can drive the second gear 7 to rotate. When the second gear 7 rotates, it can drive the two first gears 4 and the two transmission shafts 3 to rotate simultaneously. When the transmission shafts 3 rotate, they can drive the large cams 8 and the small cams 9 to rotate simultaneously and drive the feeding assembly to convey the fabric.

[0026] The cam fixing device includes a connecting plate 11, a disassembly and assembly pressing rod 12, a cylindrical fixing block 13, and a spring 14. The connecting plate 11 is slidably connected inside the transmission shaft 3. The disassembly and assembly pressing rod 12 is slidably connected inside the transmission shaft 3. The lower end of the disassembly and assembly pressing rod 12 is fixedly connected to the right end of the connecting plate 11. The upper end of the disassembly and assembly pressing rod 12 extends to the outside of the transmission shaft 3. Inside the transmission shaft 3, there is a slidably connected cylindrical fixing block 13. At the bottom of the cylindrical fixing block 13, there is a fixedly connected spring 14. The lower end of the spring 14 is fixedly connected to the inner wall of the transmission shaft 3. The left end of the connecting plate 11 is fixedly connected to the lower end of the cylindrical fixing block 13. The upper end of the cylindrical fixing block 13 extends to the outside of the transmission shaft 3. Inside the large cam 8, there is a fixing card slot 15. The upper end of the cylindrical fixing block 13 is slidably clamped inside the fixing card slot 15.

[0027] When the user needs to replace the large cam 8, the user only needs to press the disassembly and assembly lever 12 with a finger. The sliding of the disassembly and assembly lever 12 can drive the connecting plate 11 and the cylindrical fixing block 13 to slide downward and compress the spring 14. At this time, the spring 14 gives a reverse elastic force to the cylindrical fixing block 13, and the cylindrical fixing block 13 slides and disengages from the inside of the fixing slot 15. The user slides the rotating rod 6 and disengages it from the surface of the transmission shaft 3 to complete the disassembly. Then, the user takes out a new large cam 8 and slides it onto the surface of the transmission shaft 3. After the user releases the disassembly and assembly lever 12, the spring 14 can release the elastic force and push the cylindrical fixing block 13 to slide upward and snap into the inside of the fixing slot 15, thus completing the installation of the large cam 8. Through this installation method, the user no longer needs to rotate the bolt with a screwdriver. By pressing the disassembly and assembly lever 12 with a finger, the user can replace the large cam 8, improving the convenience of the user for disassembling and assembling the large cam 8 and enhancing the practicality of the large cam 8.

[0028] Working principle: For this double cam for sewing machine that is convenient for installation, when the sewing machine body 1 is in use, the driving device can drive the rotating rod 6 to rotate. The rotation of the rotating rod 6 can drive the second gear 7 to rotate. The rotation of the second gear 7 can drive the two first gears 4 and the two transmission shafts 3 to rotate simultaneously. The rotation of the transmission shaft 3 can drive the large cam 8 and the small cam 9 to rotate simultaneously and drive the feeding assembly to convey the fabric. The user presses the disassembly and assembly lever 12 with a finger. The sliding of the disassembly and assembly lever 12 can drive the connecting plate 11 and the cylindrical fixing block 13 to slide downward and compress the spring 14. At this time, the spring 14 gives a reverse elastic force to the cylindrical fixing block 13, and the cylindrical fixing block 13 slides and disengages from the inside of the fixing slot 15. The user slides the rotating rod 6 and disengages it from the surface of the transmission shaft 3 to complete the disassembly. Then, the user takes out a new large cam 8 and slides it onto the surface of the transmission shaft 3. After the user releases the disassembly and assembly lever 12, the spring 14 can release the elastic force and push the cylindrical fixing block 13 to slide upward and snap into the inside of the fixing slot 15, thus completing the installation of the large cam 8, improving the convenience of the user for disassembling and assembling the large cam 8 and enhancing the practicality of the large cam 8.

[0029] The above has described the embodiments of the present invention in detail with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art in the technical field, various changes can be made without departing from the purpose of the present invention.

Claims

1. A double cam for a sewing machine that is convenient for installation, characterized in that, Including: A sewing machine body (1) and a cam fixing device; An installation frame (2) is fixedly connected inside the sewing machine body (1). Two transmission shafts (3) are rotatably connected inside the installation frame (2). Large cams (8) are fixedly connected to the left ends of the two transmission shafts (3). Small cams (9) are fixedly connected to the surfaces of the two large cams (8). Three through holes (10) are formed in the surfaces of the two large cams (8); The cam fixing device includes a connecting plate (11), a disassembly and assembly pressure rod (12), a cylindrical fixing block (13) and a spring (14). The connecting plate (11) is slidably connected inside the transmission shaft (3). The disassembly and assembly pressure rod (12) is slidably connected inside the transmission shaft (3). The lower end of the disassembly and assembly pressure rod (12) is fixedly connected to the right end of the connecting plate (11). The upper end of the disassembly and assembly pressure rod (12) extends to the outside of the transmission shaft (3). A cylindrical fixing block (13) is slidably connected inside the transmission shaft (3). A spring (14) is fixedly connected to the bottom of the cylindrical fixing block (13). The lower end of the spring (14) is fixedly connected to the inner wall of the transmission shaft (3). The left end of the connecting plate (11) is fixedly connected to the lower end of the cylindrical fixing block (13).

2. The double cam for a sewing machine that is easy to install according to claim 1, characterized in that: First gears (4) are fixedly connected to the right ends of the two transmission shafts (3).

3. The double cam for a sewing machine that is convenient for installation according to claim 2, wherein: A support frame (5) is fixedly connected inside the sewing machine body (1). A rotating rod (6) is rotatably sleeved inside the support frame (5).

4. The double cam for a sewing machine that is easy to install according to claim 3, wherein: A second gear (7) is fixedly connected to the left end of the rotating rod (6). The second gear (7) is meshed with the two first gears (4).

5. The double cam for a sewing machine that is convenient for installation according to claim 1, wherein: The upper end of the cylindrical fixing block (13) extends to the outside of the transmission shaft (3).

6. The double cam for a sewing machine that is easy to install according to claim 5, wherein: A fixing card slot (15) is formed inside the large cam (8). The upper end of the cylindrical fixing block (13) is slidably clamped inside the fixing card slot (15).

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