Sewing machine head structure and sewing machine

Abstract

The present invention discloses a sewing machine head structure, including a casing, characterized in that a presser foot is arranged on the casing, a connecting rod is installed on the upper side of the presser foot and located in the casing, a cover tube is sleeved on the upper side of the connecting rod, a sealing plug is fixedly connected to the upper side of the connecting rod and located in the cavity, the cover tube is fixedly connected to the casing, an electromagnetic air pump is installed on the side of the ventilation duct away from the cover tube, and an adjusting mechanism for adjusting the air pressure in the cavity is also arranged on the upper side of the cover tube. The electromagnetic air pump is first started, and the electromagnetic air pump is used to continuously blow air into the cover tube, so that the pressure in the cover tube is increased, and the sealing plug is pushed downward, thereby driving the presser foot to move downward together through the connecting rod, so that the presser foot presses the cloth, and at the same time, as the electromagnetic air pump continuously sprays air, the pressure in the cover tube will gradually increase, and at this time, the pressure in the cover tube is adjusted by the adjusting mechanism, so that it can respond quickly and reduce the labor intensity of workers.

Description

Technical Field

[0001] This invention relates to the field of sewing machine technology, specifically to a sewing machine head structure and a sewing machine. 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. During the operation of a sewing machine, due to the varying thickness of the fabric, it is often necessary to adjust the height of the presser foot to suit the thickness of the fabric.

[0003] Currently, the presser foot pressure adjustment device mainly includes a presser rod assembly for mounting the presser foot at the lower end, a pressure adjusting spring sleeved on the presser rod assembly, a pressure adjusting screw set at the upper end of the presser rod assembly, and a pressure adjusting nut. The pressure adjusting screw is screwed into the sewing machine housing and locked by the pressure adjusting nut. The presser foot pressure is adjusted by screwing the pressure adjusting screw into the sewing machine housing to different depths.

[0004] The presser foot pressure adjustment device is manually adjustable, which is somewhat inconvenient to operate. In particular, during the process of continuously increasing the presser foot pressure, it is necessary to increase the depth of the pressure adjusting screw into the housing. After long-term use, the force on the threads on the outer circumference of the pressure adjusting screw will increase. When the threads on the outer circumference of the pressure adjusting screw are subjected to heavy pressure for a long time and frequent adjustment of the presser foot pressure, the wear resistance and service life of the pressure adjusting screw are significantly affected. Summary of the Invention

[0005] In order to solve at least one of the technical problems mentioned in the background art, the present invention aims to provide a sewing machine head structure and a sewing machine that can respond quickly and accurately, while reducing the labor intensity of workers.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a sewing machine head structure, comprising a machine housing, characterized in that a presser foot is provided on the machine housing, a connecting rod is installed on the upper side of the presser foot and inside the machine housing, a cover is sleeved on the upper side of the connecting rod, a cavity is opened in the cover, a through hole for the connecting rod to pass through is opened on the lower side of the cover, a sealing plug is fixedly connected to the upper side of the connecting rod and inside the cavity, the cover is fixedly connected to the machine housing, a ventilation pipe is provided on the upper side of the cover, an electromagnetic air pump is installed on the side of the ventilation pipe away from the cover, and an adjustment mechanism for adjusting the air pressure inside the cavity is also provided on the upper side of the cover.

[0007] Furthermore, a guide groove is provided on the peripheral side wall of the connecting rod, and a limit block is fixedly installed on the inner wall of the perforation.

[0008] Furthermore, the adjustment mechanism includes a housing fixedly installed on the circumferential side of the cover cylinder. The housing has a first air hole communicating with the cavity and a second air hole communicating with the first air hole. The first air hole and the second air hole are coaxial, and the inner diameter of the first air hole is smaller than that of the second air hole. A plug for blocking the first air hole is slidably disposed in the second air hole. The housing has a vent hole communicating with the second air hole. An electromagnet is fixedly installed on the inner wall of the second air hole, and a magnetic block is fixedly installed on the side of the plug near the electromagnet.

[0009] Furthermore, the side of the plug closest to the first vent is a conical surface, and the gap between the annular circumferential surface of the plug and the inner wall of the second vent is 0.2mm-0.4mm.

[0010] Furthermore, the connecting rod includes a first rod and a second rod. The first rod is fixedly connected to the sealing plug, and a connecting member is fixedly connected to the side of the first rod away from the sealing plug. The second rod is fixedly connected to the pressure foot, and a locking member is provided on the side of the second rod away from the pressure foot.

[0011] Furthermore, the connecting component includes a connecting block, the connecting block having a plug-in track and a locking groove disposed within the plug-in track on its peripheral side, the locking component including a circular groove on one side of the second rod, a first magnet fixedly installed on the bottom wall of the circular groove, a second magnet fixedly installed on the connecting block, the magnetic poles of the first magnet and the second magnet being opposite on their opposing faces, and a protrusion fixedly connected to the inner wall of the circular groove, when the protrusion is sequentially inserted into the plug-in track and slides into the locking groove, the first magnet and the second magnet come into contact, and the first rod and the second rod are in a locked state.

[0012] Furthermore, the upper side of the cover is open, and a cap is threadedly installed on the upper side of the cover, with a rubber sealing ring provided between the cap and the cover.

[0013] Furthermore, the outer casing is equipped with a control panel, which is connected to the electromagnet via electrical signals.

[0014] Furthermore, it includes a foot pedal and a support, on which a worktable is fixedly mounted, and the sewing machine head mechanism is set on the worktable.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: First, the electromagnetic air pump is started to draw air into the hood, thus creating a negative pressure state inside the hood. Under this negative pressure, the sealing plug moves upward, which in turn moves the presser foot along with the connecting rod, raising the presser foot and facilitating the placement of the fabric to be processed on the processing table. Then, the electromagnetic air pump is started again, changing its operating mode to continuously blow air into the hood, increasing the pressure inside the hood and pushing the sealing plug downward. This, in turn, moves the presser foot downward along with the connecting rod, pressing the fabric. Simultaneously, as the electromagnetic air pump continues to blow air, the pressure inside the hood gradually increases. The pressure inside the hood is then adjusted by the regulating mechanism, enabling a rapid response and reducing the labor intensity of the workers. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the sewing machine head structure of the present invention;

[0018] Figure 3 This is a schematic diagram of the internal structure of the sewing machine head of the present invention;

[0019] Figure 4 This is a schematic diagram of the presser foot, connecting rod, and cover structure of the present invention;

[0020] Figure 5 This is a cross-sectional view of the cover structure of the present invention;

[0021] Figure 6 For the present invention in Figure 5 Enlarged view of a portion of the structure at point A;

[0022] Figure 7 For the present invention in Figure 5 Enlarged schematic diagram of the structure at point B in the middle;

[0023] Figure 8 This is a schematic diagram of the connecting member and locking member of the present invention;

[0024] Figure 9 This is a cross-sectional view of the connecting member and locking member of the present invention.

[0025] In the diagram: 1. Housing; 2. Presser foot; 3. Connecting rod; 31. First rod; 32. Second rod; 33. Connecting component; 331. Connecting block; 332. Insertion rail; 333. Locking groove; 34. Locking component; 341. Circular groove; 342. First magnet; 343. Second magnet; 344. Protrusion; 4. Cover; 5. Cavity; 6. Perforation; 7. Sealing plug; 8. Ventilation pipe; 9. Adjustment mechanism; 91. Outer shell; 92. First vent; 93. Second vent; 94. Plug; 95. Vent hole; 96. Electromagnet; 97. Magnetic block; 10. Guide groove; 11. Limiting block; 12. Cap; 13. Rubber sealing ring; 14. Control panel; 15. Foot pedal; 16. Support; 17. Workbench. Detailed Implementation

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Please see Figure 1 This embodiment provides a sewing machine, including a foot pedal 15 and a support 16. A worktable 17 is fixedly installed on the support 16, and a sewing machine head structure is provided on the worktable 17.

[0028] Please see Figures 2-5 The sewing machine head structure includes a machine housing 1, a presser foot 2 on the machine housing 1, a connecting rod 3 installed on the upper side of the presser foot 2 and inside the machine housing 1, a cover 4 sleeved on the upper side of the connecting rod 3, a cavity 5 opened inside the cover 4, a through hole 6 opened on the lower side of the cover 4 for the connecting rod 3 to pass through, a sealing plug 7 fixedly connected on the upper side of the connecting rod 3 and inside the cavity 5, the cover 4 fixedly connected to the machine housing 1, a ventilation pipe 8 provided on the upper side of the cover 4, an electromagnetic air pump installed on the side of the ventilation pipe 8 away from the cover 4, and an adjustment mechanism 9 for adjusting the air pressure inside the cavity 5 also provided on the upper side of the cover 4.

[0029] When processing fabric, the pressure between the presser foot 2 and the fabric needs to be adjusted according to the fabric thickness to facilitate the movement of the fabric at the machine head. The specific working method is as follows: First, start the electromagnetic air pump to draw air into the cover cylinder 4, so that the cover cylinder 4 is in a negative pressure state. At this time, under the negative pressure of the cover cylinder 4, the sealing plug 7 will move upward, thereby driving the presser foot 2 to move together through the connecting rod 3, so that the presser foot 2 is raised, making it easier to place the fabric to be processed on the processing table;

[0030] Then the electromagnetic air pump is restarted. At this time, the working mode of the electromagnetic air pump changes and it will continuously blow air into the cover cylinder 4, which will increase the pressure inside the cover cylinder 4 and push the sealing plug 7 to move downward. This will drive the presser foot 2 to move downward through the connecting rod 3, so that the presser foot 2 presses the fabric. At the same time, as the electromagnetic air pump continues to blow air, the pressure inside the cover cylinder 4 will gradually increase. At this time, the adjustment mechanism 9 needs to adjust the pressure inside the cover cylinder 4.

[0031] First, set a required pressure value for the adjusting mechanism 9, which is the pressure value calculated based on the pressure of the presser foot 2 on the fabric. When the pressure inside the cover cylinder 4 exceeds this pressure value, the adjusting mechanism 9 will release the gas inside the cover cylinder 4, that is, release the pressure inside the cover cylinder 4. When the pressure inside the cover cylinder 4 is less than this pressure value, the adjusting mechanism 9 will not release the gas.

[0032] Therefore, this application uses the adjusting mechanism 9 to regulate the gas pressure inside the shroud 4, thereby achieving pressure regulation. Simultaneously, an electromagnetic air pump draws air from the shroud 4, raising the pressure foot 2. This equipment can be fully automated, meaning both the electromagnetic air pump and the adjusting mechanism 9 are electrically connected to the controller, allowing for programmed automation based on scenario requirements; or it can be semi-automated, again with both the electromagnetic air pump and the adjusting mechanism 9 electrically connected to the controller, allowing manual adjustment of the electromagnetic air pump's on / off state and operating mode, as well as the preset pressure value for the adjusting mechanism 9's air release, via buttons. This enables rapid response and reduces worker workload.

[0033] Please see Figures 5-7 To prevent the connecting rod 3 from shifting, a guide groove 10 is provided on the side wall of the connecting rod 3, and a limit block 11 is fixedly installed on the inner wall of the through hole 6. Through the interaction force between the limit block 11 and the inner wall of the guide groove 10, the connecting rod 3 can only move up and down in the vertical direction and cannot rotate.

[0034] Please see Figures 5-6 The adjusting mechanism 9 specifically includes a housing 91 fixedly installed on the side of the cover 4. A first vent 92 communicating with the cavity 5 is opened inside the housing 91. A second vent 93 communicating with the first vent 92 is also opened inside the housing 91. The first vent 92 and the second vent 93 are coaxial, and the inner diameter of the first vent 92 is smaller than that of the second vent 93. A plug 94 for blocking the first vent 92 is slidably disposed inside the second vent 93. A vent 95 communicating with the second vent 93 is opened on the housing 91. An electromagnet 96 is fixedly installed on the inner wall of the second vent 93. A magnetic block 97 is fixedly installed on the side of the plug 94 near the electromagnet 96. A control panel 14 is installed on the housing 91, and the control panel 14 is electrically connected to the electromagnet 96. When the electromagnet is energized, the opposing surfaces of the electromagnet 96 and the magnetic block repel each other.

[0035] When it is necessary to adjust the pressure of the cavity 5 inside the cover 4, the electromagnet 96 is energized by adjusting the control panel 14. After the electromagnet 96 is energized, it repels the magnetic block 97. Since the magnetic block 97 is installed on the plug 94, it pushes the plug 94 to block the first air hole 92. As long as the force exerted by the pressure inside the cavity 5 on the plug 94 is less than the magnetic repulsion force between the electromagnet 96 and the magnetic block 97, the plug 94 will not move. Therefore, when it is necessary to release the air in the cavity 5, the magnetic repulsion force between the electromagnet 96 and the magnetic block 97 can be adjusted by adjusting the amount of electricity supplied to the electromagnet 96 through the control panel 14.

[0036] When the pressure inside cavity 5 exceeds the set pressure value, the pushing force of the pressure inside cavity 5 on the plug 94 will be greater than the magnetic repulsion force between electromagnet 96 and magnetic block 97. As a result, the gas inside cavity 5 enters the second air hole 93 through the gap between plug 94 and the inner wall of the first air hole 92, and then is discharged to the outside through the vent 95, thereby releasing the gas inside cavity 5. When adjusting the pressure of presser foot 2 for different fabrics, it is only necessary to adjust the magnitude of the stable pressure of cavity 5, that is, to adjust the magnetic repulsion force between magnetic block 97 and electromagnet 96, and thus adjust the current of electromagnet 96 through control panel 14.

[0037] Please see Figure 6 The side of the plug 94 closest to the first vent 92 is a conical surface, and the gap between the annular circumferential surface of the plug 94 and the inner wall of the second vent 93 is 0.1mm-0.3mm. Therefore, when the plug 94 just separates from the inner wall of the first vent 92, the gas in the cavity 5 can be expelled outwards, resulting in sensitive gas release and relatively stable pressure within the cavity 5.

[0038] To facilitate the replacement of its internal components, the connecting rod 3 includes a first rod 31 and a second rod 32. The first rod 31 is fixedly connected to the sealing plug 7, and a connecting member 33 is fixedly connected to the side of the first rod 31 away from the sealing plug 7. The second rod 32 is fixedly connected to the pressure foot 2, and a locking member 34 is provided on the side of the second rod 32 away from the pressure foot 2.

[0039] Please see Figure 5 , Figure 8 and Figure 9 The first rod 31 and the second rod 32 are connected by the cooperation between the connecting member 33 and the lock, and the first rod 31 and the second rod 32 can also be separated.

[0040] The upper side of the cover 4 is open, and a cap 12 is threadedly installed on the upper side of the cover 4. A rubber sealing ring 13 is provided between the cap 12 and the cover 4.

[0041] When it is necessary to replace or disassemble the presser foot 2 or the connecting rod 3, first separate the first rod 31 from the second rod 32, then open the cap 12, and then the first rod 31 drives the sealing plug 7 out of the opening on the upper side of the cover 4 to complete the separation.

[0042] Please see Figure 5 , Figure 8 and Figure 9 The connecting member 33 includes a connecting block 331. The connecting block 331 has a plug-in track 332 and a locking groove 333 in the plug-in track 332 on its peripheral side. The locking member 34 includes a circular groove 341 on one side of the second rod 32. A first magnet 342 is fixedly installed on the bottom wall of the circular groove 341. A second magnet 343 is fixedly installed on the connecting block 331. The magnetic poles of the first magnet 342 and the second magnet 343 are opposite on opposite sides. A protrusion 344 is fixedly connected to the inner wall of the circular groove 341. When the protrusion 344 is inserted into the plug-in track 332 in sequence and slides into the locking groove 333, the first magnet 342 and the second magnet 343 come into contact, and the first rod 31 and the second rod 32 are in a locked state.

[0043] When it is necessary to lock the first rod 31 and the second rod 32, first insert the connecting block 331 on the first rod 31 into the circular groove 341, and then insert the protrusion 344 along the insertion track 332. By relative sliding, the protrusion 344 is inserted into the locking groove 333. After the protrusion 344 is inserted into the locking groove 333, the connecting block 331 also contacts the bottom wall of the circular groove 341, that is, the first magnetic block 97 contacts the second magnetic block 97.

[0044] The first rod 31 drives the second rod 32 to move up and down mainly by the mutual magnetic attraction between the first magnetic block 97 and the second magnetic block 97. The interaction between the protrusion 344 and the locking groove 333 restricts the first rod 31 and the second rod 32 from rotating relative to each other after locking, preventing the pressure foot 2 from shifting. When it is necessary to disassemble the first rod 31 and the second rod 32, only a downward pulling force needs to be applied to the second rod 32, so that the first magnetic block 97 and the second magnetic block 97 separate relative to each other. At the same time, the protrusion 344 also disengages from the locking groove 333. Then, the first rod 31 and the second rod 32 are rotated relative to each other, so that the protrusion 344 slides out along the insertion track 332, completing the separation of the first rod 31 and the second rod 32.

[0045] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A sewing machine head structure, comprising a housing (1), characterized in that: The casing (1) is provided with a presser foot (2), a connecting rod (3) is installed on the upper side of the presser foot (2) and located in the casing (1), a cover tube (4) is sleeved on the upper side of the connecting rod (3), a cavity (5) is provided in the cover tube (4), a through hole (6) for the connecting rod (3) to pass through is provided on the lower side of the cover tube (4), a sealing plug (7) is fixedly connected on the upper side of the connecting rod (3) and located in the cavity (5), the cover tube (4) is fixedly connected to the casing (1), a ventilation duct (8) is provided on the upper side of the cover tube (4), an electromagnetic air pump is installed on the side of the ventilation duct (8) away from the cover tube (4), and a regulating mechanism (9) for regulating the air pressure in the cavity (5) is also provided on the upper side of the cover tube (4); The regulating mechanism (9) comprises a shell (91) fixedly mounted on a side surface of the cover tube (4); a first air hole (92) communicating with the cavity (5) is provided in the shell (91); a second air hole (93) communicating with the first air hole (92) is provided in the shell (91); the first air hole (92) and the second air hole (93) are coaxial; the inner diameter of the first air hole (92) is smaller than that of the second air hole (93); a plug (94) for plugging the first air hole (92) is slidably arranged in the second air hole (93); an air vent (95) communicating with the second air hole (93) is provided on the shell (91); an electromagnet (96) is fixedly mounted on the inner wall of the second air hole (93); a magnetic block (97) is fixedly mounted on a side of the plug (94) close to the electromagnet (96); The housing (91) is equipped with a control panel (14), and the control panel (14) is electrically connected to the electromagnet (96). When the electromagnet (96) is energized, the opposing surfaces of the electromagnet (96) and the magnetic block (97) repel each other. The connecting rod (3) comprises a first rod (31) and a second rod (32); the first rod (31) is fixedly connected to the sealing plug (7); a connecting member (33) is fixedly connected to a side of the first rod (31) away from the sealing plug (7); the second rod (32) is fixedly connected to the presser foot (2); a locking member (34) is provided on a side of the second rod (32) away from the presser foot (2); The connecting member (33) comprises a connecting block (331), a plug-in track (332) and a locking groove (333) arranged in the plug-in track (332) are arranged on the peripheral side surface of the connecting block (331), the locking member (34) comprises a circular groove (341) arranged on one side of the second rod (32), a first magnet (342) is fixedly mounted on the bottom wall of the circular groove (341), a second magnet (343) is fixedly mounted on the connecting block (331), the first magnet (342) and the second magnet (343) have opposite magnetic poles on opposite surfaces, a protrusion (344) is fixedly connected to the inner wall of the circular groove (341), and when the protrusion (344) is sequentially inserted into the plug-in track (332) and slidably engaged in the locking groove (333), the first magnet (342) and the second magnet (343) are in contact, and the first rod (31) and the second rod (32) are in a locked state.

2. The sewing machine head structure according to claim 1, characterized in that: A guide groove (10) is provided on the peripheral side wall of the connecting rod (3), and a limit block (11) is fixedly installed on the inner wall of the through hole (6).

3. The sewing machine head structure according to claim 1, characterized in that: The side of the plug (94) close to the first air hole (92) is a conical surface, and the gap between the annular circumferential side surface of the plug (94) and the inner wall of the second air hole (93) is 0.1 mm-0.3 mm.

4. The sewing machine head structure according to claim 1, characterized in that: The upper side of the cover cylinder (4) is open, a cover cap (12) is threadedly mounted on the upper side of the cover cylinder (4), and a rubber sealing ring (13) is provided between the cover cap (12) and the cover cylinder (4).

5. A sewing machine comprising the sewing machine head structure according to any one of claims 1 to 4, characterized in that: It comprises a foot pedal (15) and a bracket (16); a workbench (17) is fixedly mounted on the bracket (16); and a sewing machine head mechanism is arranged on the workbench (17).

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