Cloth feeding and presser foot lifting mechanism of sewing machine

Abstract

The utility model provides a cloth feeding and presser foot lifting mechanism of a sewing machine, which comprises a driving motor, a first cam and a second cam are fixedly sleeved on an output shaft of the driving motor, a first connecting rod and a second connecting rod are further hinged on the output shaft, a first roller is hinged on the first connecting rod, and the first roller is contacted with the side surface of the first cam; the driving motor operates and drives the first cam and the second cam to rotate, the first cam drives the first connecting rod to swing through the first roller when rotating, and the second cam drives the second connecting rod to swing through the second roller when rotating. The first connecting rod is connected with a differential tooth and drives the differential tooth to perform differential feeding, and the second connecting rod is connected with a presser foot and drives the presser foot to move up and down. Compared with the prior art, the cloth feeding and presser foot lifting mechanism of the sewing machine has the advantages that cloth feeding and presser foot lifting driving can be achieved through one driving motor at the same time, cost is saved, and meanwhile occupied space is greatly saved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sewing equipment technical field relates to a sewing machine's cloth feeding, lifting presser foot mechanism. BACKGROUND

[0002] The sewing machine often needs to use the cloth feeding and the action of lifting presser foot when carrying out the sewing work, the corresponding sewing machine has the cloth feeding mechanism and the lifting presser foot mechanism, in the prior art, the cloth feeding mechanism and the lifting presser foot mechanism are generally independent mechanisms, are driven by different motors or electromagnets, and the space occupied is large, and the cost is high. SUMMARY

[0003] The utility model discloses a sewing machine's cloth feeding, lifting presser foot mechanism that a drive motor realizes cloth feeding and lifting presser foot drive simultaneously is provided for the above -mentioned problems existing in the prior art.

[0004] The utility model discloses a sewing machine's cloth feeding, lifting presser foot mechanism, including drive motor, the first cam and second cam are set fixed with on the output shaft of drive motor, still articulate to have first connecting rod and second connecting rod on the output shaft, articulate to have first roller on the first connecting rod, and the first roller with first cam side surface contact, articulate to have second roller on the second connecting rod, and the second roller with second cam side surface contact, drive motor runs and drives first cam and second cam rotation, when first cam rotates, through first roller drive first connecting rod swing, when second cam rotates, through second roller drive second connecting rod swing, and the first connecting rod is connected with differential tooth and drives differential tooth differential feeding, and the second connecting rod is connected with presser foot and drives presser foot moves up and down.

[0005] In the above-mentioned sewing machine's cloth feeding, lifting presser foot mechanism, the first connecting rod is connected with the differential tooth through the crank connecting rod cloth feeding assembly, the crank connecting rod cloth feeding assembly includes first crank, transmission shaft, swing seat, two first swing plates, two second swing plates, second crank, feeding shaft, the first crank is articulated in the frame, one end of the first crank is articulated in the end of the first connecting rod, the other end of the first crank is fixedly connected with the transmission shaft, the swing seat is fixed at the end of the transmission shaft, the swing seat includes connecting portion and the installation portion located at both sides of the connecting portion, the swing seat is similar to U type, one end of two first swing plates is respectively articulated in the end of two installation portions, the other end of two first swing plates is respectively articulated with the end of two second swing plates, the second crank is articulated between two second swing plates, the feeding shaft is fixed on the second crank, and both ends of the feeding shaft are articulated in the frame, and the feeding shaft is connected with the differential tooth.

[0006] In the fabric feeding and presser foot lifting mechanism of the sewing machine, the first connecting rod drives the first crank, the transmission shaft and the swing base to rotate when the first connecting rod swings, the rotation of the swing base drives the feeding shaft to rotate through the first swing plate, the second swing plate and the second crank, and the feeding shaft drives the differential tooth to feed differentially.

[0007] In the fabric feeding and presser foot lifting mechanism of the sewing machine, the second connecting rod is connected with a presser foot through a pull rod linkage assembly, the pull rod linkage assembly comprises a swing block, a first pull rod, a rear lever, a second pull rod, a front lever and a presser foot lifting plate, the swing block is hinged to the end of the second connecting rod, a swing rotating shaft is arranged on the swing block, the swing rotating shaft is fixed on the frame, the second connecting rod drives the swing block to rotate around the swing rotating shaft, the middle part of the rear lever is hinged to the frame through a rear rotating shaft and can swing flexibly with the rear rotating shaft as the center of rotation, the middle part of the front lever is hinged to the frame through a front rotating shaft and can swing flexibly with the front rotating shaft as the center of rotation, a swing connecting shaft is arranged on the swing block, the two ends of the rear lever are respectively provided with a first rear connecting shaft and a second rear connecting shaft, the two ends of the front lever are respectively provided with a first front connecting shaft and a second front connecting shaft, the two ends of the first pull rod are respectively hooked to the swing connecting shaft and the first rear connecting shaft, the two ends of the second pull rod are respectively hooked to the second rear connecting shaft and the first front connecting shaft, the second front connecting shaft is arranged in the end of the presser foot lifting plate to connect the presser foot lifting plate and the front lever, and the presser foot is connected with the presser foot lifting plate.

[0008] In the fabric feeding and presser foot lifting mechanism of the sewing machine, the second connecting rod drives the swing block to rotate around the swing rotating shaft when the second connecting rod swings, the rotation of the swing block drives the rear lever to rotate through the first pull rod, the rotation of the rear lever drives the front lever to rotate through the second pull rod, and the rotation of the front lever is converted into the up-down movement of the presser foot lifting plate, thereby completing the lifting of the presser foot.

[0009] In the fabric feeding and presser foot lifting mechanism of the sewing machine, the pull rod linkage assembly further comprises a lifting transmission block, a lifting transmission rod, a presser foot movement guide frame and a presser foot connecting plate, the bottom surface of the lifting transmission block is in contact with the presser foot lifting plate and synchronously lifts with the presser foot lifting plate, a lifting recess is formed on the presser foot lifting plate, a lifting protrusion is formed on the end of the lifting transmission block, the lifting protrusion is located in the lifting recess, the lifting transmission rod is arranged in the lifting transmission block, the presser foot movement guide frame is fixed to the bottom of the lifting transmission rod, the presser foot connecting plate is installed on the side of the presser foot movement guide frame, and the presser foot is fixed to the bottom of the presser foot connecting plate.

[0010] The first cam and the second cam are provided with a connecting ring, the first cam, the connecting ring and the second cam are integrally formed, a first hinged block is formed on the side surface of the first cam, a long strip-shaped first hinged hole is formed on the first connecting rod, the first hinged block is located in the first hinged hole, a second hinged block is formed on the side surface of the second cam, a long strip-shaped second hinged hole is formed on the second connecting rod, and the second hinged block is located in the second hinged hole.

[0011] Compared with the prior art, the feed mechanism and the presser foot lifting mechanism of the sewing machine can drive the differential tooth and the presser foot through the first cam and the second cam respectively, the different shapes of the first cam and the second cam can control the transmission processes of the differential tooth and the presser foot respectively, the differential tooth and the presser foot can accurately operate, one driving motor can drive the feed and the presser foot lifting, the cost is saved, the occupied space is greatly saved, the structure is simple and ingenious, and the operation is stable and reliable. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 FIG. 1 is a schematic diagram of the three-dimensional structure of the feed mechanism and the presser foot lifting mechanism of the sewing machine.

[0013] Figure 2 FIG. 2 is a schematic diagram of the three-dimensional structure of part of the feed mechanism and the presser foot lifting mechanism of the sewing machine.

[0014] Figure 3 FIG. 3 is a schematic diagram of the three-dimensional structure of the pull rod linkage assembly of the feed mechanism and the presser foot lifting mechanism of the sewing machine.

[0015] Figure 4 FIG. 4 is a schematic diagram of the three-dimensional structure of the feed mechanism and the presser foot lifting mechanism of the sewing machine located in the rack.

[0016] In the figure, 1 is a driving motor, 101 is an output shaft, 11 is a first cam, 12 is a second cam, 13 is a first connecting rod, 14 is a second connecting rod, 15 is a first roller, 16 is a second roller, 17 is a second hinged hole, 18 is a second hinged block, 2 is a crank connecting rod feed assembly, 21 is a first crank, 22 is a transmission shaft, 23 is a swing seat, 24 is a first swing plate, 25 is a second swing plate, 26 is a second crank, 27 is a feeding shaft, 3 is a pull rod linkage assembly, 31 is a swing block, 32 is a first pull rod, 33 is a rear lever, 34 is a second pull rod, 35 is a front lever, 36 is a presser foot lifting plate, 37 is a swing shaft, 38 is a lifting transmission block, 39 is a lifting transmission rod, 310 is a presser foot movement guide frame, 311 is a presser foot connecting plate, 4 is a differential tooth, 5 is a presser foot, and 6 is a rack. DETAILED DESCRIPTION

[0017] The utility model discloses the following specific embodiments are combined with the drawings, and the technical scheme of the utility model is further described, but the utility model is not limited to these embodiments.

[0018] As Figures 1-4 The utility model discloses a sewing machine's cloth feeding, lift the presser foot mechanism, including drive motor 1, the output shaft 101 of drive motor 1 is set fixed with first cam 11 and second cam 12. The output shaft 101 still articulates with first connecting rod 13 and second connecting rod 14, and first connecting rod 13 articulates with first roller 15, and first roller 15 contacts the side of first cam 11, and second connecting rod 14 articulates with second roller 16, and second roller 16 contacts the side of second cam 12. Drive motor 1 runs and drives first cam 11 and second cam 12 rotate, and when first cam 11 rotates, first roller 15 drives first connecting rod 13 swing, and when second cam 12 rotates, second roller 16 drives second connecting rod 14 swing. First connecting rod 13 is connected with differential tooth 4 and drives differential tooth 4 differential feeding, and second connecting rod 14 is connected with presser foot 5 and drives presser foot 5 move up and down.

[0019] The above technical scheme: first cam 11 and second cam 12 are equipped with connecting ring, and first cam 11, connecting ring and second cam 12 are integrally formed. The side of first cam 11 is made with first articulation block, and first connecting rod 13 is made with long strip-shaped first articulation hole, and first articulation block is located in first articulation hole. The side of second cam 12 is made with second articulation block 18, and second connecting rod 14 is made with long strip-shaped second articulation hole 17, and second articulation block 18 is located in second articulation hole 17.

[0020] The technical scheme above: the first connecting rod 13 is connected with the differential tooth 4 through the crank connecting rod cloth feeding assembly 2. The crank connecting rod cloth feeding assembly 2 comprises a first crank 21, a transmission shaft 22, a swing seat 23, two first swing plates 24, two second swing plates 25, a second crank 26 and a feeding shaft 27. The first crank 21 is hinged in the frame 6, one end of the first crank 21 is hinged at the end of the first connecting rod 13, and the other end of the first crank 21 is fixedly connected with the transmission shaft 22. The swing seat 23 is fixed at the end of the transmission shaft 22, the swing seat 23 comprises a connecting portion and two mounting portions on both sides of the connecting portion, and the swing seat 23 is approximately U-shaped. One end of the two first swing plates 24 is respectively hinged at the end of the two mounting portions, and the other end of the two first swing plates 24 is respectively hinged with the end of the two second swing plates 25. The second crank 26 is hinged between the two second swing plates 25, and the feeding shaft 27 is fixed on the second crank 26, and the two ends of the feeding shaft 27 are hinged in the frame 6. The feeding shaft 27 is connected with the differential tooth 4. The connection mode between the feeding shaft 27 and the differential tooth 4 is the same as the connection mode between the feeding shaft and the feeding tooth and the lower differential feeding tooth in the patent with the patent number "ZL201410442503.4" and the name "upper and lower differential feeding sewing machine". When the first connecting rod 13 swings, the first crank 21, the transmission shaft 22 and the swing seat 23 are rotated, the rotation of the swing seat 23 drives the feeding shaft 27 to rotate through the first swing plate 24, the second swing plate 25 and the second crank 26, and the feeding shaft 27 drives the differential tooth 4 to differentially feed.

[0021] In the above technical solution: the second connecting rod 14 is connected with the presser foot 5 through the pull rod linkage assembly 3. The pull rod linkage assembly 3 comprises a swing block 31, a first pull rod 32, a rear lever 33, a second pull rod 34, a front lever 35, and a presser foot lifting plate 36. The swing block 31 is hinged at the end of the second connecting rod 14, and a swing shaft 37 is arranged on the swing block 31 and fixed on the rack 6. The second connecting rod 14 drives the swing block 31 to rotate around the swing shaft 37. The middle part of the rear lever 33 is hinged on the rack 6 through a rear shaft and can swing flexibly around the rear shaft as the center of rotation. The middle part of the front lever 35 is hinged on the rack 6 through a front shaft and can swing flexibly around the front shaft as the center of rotation. The swing block 31 is provided with a swing connecting shaft, the two ends of the rear lever 33 are respectively provided with a first rear connecting shaft and a second rear connecting shaft, and the two ends of the front lever 35 are respectively provided with a first front connecting shaft and a second front connecting shaft. The two ends of the first pull rod 32 are respectively hooked on the swing connecting shaft and the first rear connecting shaft, and the two ends of the second pull rod 34 are respectively hooked on the second rear connecting shaft and the first front connecting shaft. The second front connecting shaft is arranged in the end of the presser foot lifting plate 36 to connect the presser foot lifting plate 36 and the front lever 35. The presser foot 5 is connected with the presser foot lifting plate 36. When the second connecting rod 14 swings, it drives the swing block 31 to rotate around the swing shaft 37. The rotation of the swing block 31 drives the rear lever 33 to rotate through the first pull rod 32. The rotation of the rear lever 33 drives the front lever 35 to rotate through the second pull rod 34. The rotation of the front lever 35 is converted into the up-down movement of the presser foot lifting plate 36, thereby completing the lifting of the presser foot 5.

[0022] In the above technical solution: the pull rod linkage assembly 3 further comprises a lifting transmission block 38, a lifting transmission rod 39, a presser foot movement guide frame 310, and a presser foot connecting plate 311. The bottom surface of the lifting transmission block 38 is in contact with the presser foot lifting plate 36 and synchronously lifts with the presser foot lifting plate 36. The presser foot lifting plate 36 is provided with a lifting groove, and the end of the lifting transmission block 38 is provided with a lifting protrusion. The lifting protrusion is located in the lifting groove, and the lifting protrusion and the lifting groove cooperate to limit the left-right movement of the lifting transmission block 38 relative to the presser foot lifting plate 36, preventing the lifting transmission block 38 from moving too much to the left or right and separating from the presser foot lifting plate 36, and ensuring that the lifting transmission block 38 is always in contact with the presser foot lifting plate 36, i.e., ensuring that the presser foot lifting plate 36 can always drive the lifting transmission block 38 to synchronously lift. The lifting transmission rod 39 is fixedly arranged in the lifting transmission block 38. The presser foot movement guide frame 310 is fixed at the bottom of the lifting transmission rod 39. The presser foot connecting plate 311 is installed on the side of the presser foot movement guide frame 310. The presser foot 5 is fixed at the bottom of the presser foot connecting plate 311.

[0023] The feed mechanism and the presser foot lifting mechanism of the sewing machine drive the differential tooth 4 and the presser foot 5 through the first cam 11 and the second cam 12 respectively, the different shapes of the first cam 11 and the second cam 12 can control the transmission process of the differential tooth 4 and the presser foot 5 respectively, so that the differential tooth 4 and the presser foot 5 can operate accurately, one driving motor 1 can realize the driving of the feed mechanism and the presser foot lifting mechanism, which saves the cost, greatly saves the occupied space, and has the simple and ingenious structure and stable and reliable operation.

[0024] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, without deviating from the spirit of the present application or exceeding the scope defined by the appended claims.

[0025] Although the terms driving motor 1, output shaft 101, first cam 11, second cam 12, first connecting rod 13, second connecting rod 14, first roller 15, second roller 16, second hinged hole 17, second hinged block 18, crank connecting rod feed assembly 2, first crank 21, transmission shaft 22, swing seat 23, first swing plate 24, second swing plate 25, second crank 26, feeding shaft 27, pull rod linkage assembly 3, swing block 31, first pull rod 32, rear lever 33, second pull rod 34, front lever 35, presser foot lifting plate 36, swing shaft 37, lifting transmission block 38, lifting transmission rod 39, presser foot movement guide frame 310, presser foot connecting plate 311, differential tooth 4, presser foot 5, rack 6 are used more frequently in this article, but the possibility of using other terms is not excluded. Using these terms is only to facilitate the description and explanation of the essence of the present application; any additional limitation is contrary to the spirit of the present application.

[0026] The contents not described in detail in the specification belong to the prior art known to those skilled in the art. The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, without deviating from the spirit of the present application or exceeding the scope defined by the appended claims.

Claims

1. A fabric feeding and presser foot lifting mechanism for a sewing machine, characterized in that... The system includes a drive motor (1), on which a first cam (11) and a second cam (12) are fixedly mounted. A first connecting rod (13) and a second connecting rod (14) are also hinged to the output shaft (101). A first roller (15) is hinged to the first connecting rod (13), and the first roller (15) contacts the side of the first cam (11). A second roller (16) is hinged to the second connecting rod (14), and the second roller (16) contacts the side of the second cam (12). The drive motor (1) runs and drives the first cam (11) and the second cam (12) to rotate. When the first cam (11) rotates, it drives the first connecting rod (13) to swing through the first roller (15). When the second cam (12) rotates, it drives the second connecting rod (14) to swing through the second roller (16). The first connecting rod (13) is connected to a differential tooth (4) and drives the differential tooth (4) to feed material differentially. The second connecting rod (14) is connected to a pressure foot (5) and drives the pressure foot (5) to move up and down.

2. The fabric feeding and presser foot lifting mechanism of the sewing machine according to claim 1, characterized in that... The first connecting rod (13) is connected to the differential tooth (4) via the crank-connecting rod feeding assembly (2). The crank-connecting rod feeding assembly (2) includes a first crank (21), a drive shaft (22), a swing seat (23), two first swing plates (24), two second swing plates (25), a second crank (26), and a feeding shaft (27). The first crank (21) is hinged inside the frame (6). One end of the first crank (21) is hinged to the end of the first connecting rod (13), and the other end of the first crank (21) is fixedly connected to the drive shaft (22). The swing seat (23) is fixed to the end of the drive shaft (22). The swing seat (23) includes a connecting part and mounting parts located on both sides of the connecting part. The swing seat (23) is approximately U-shaped. One end of the two first swing plates (24) is respectively hinged to the ends of the two mounting parts. The other end of the two first swing plates (24) is respectively hinged to the ends of the two second swing plates (25). A second crank (26) is hinged between the two second swing plates (25). The feeding shaft (27) is fixed on the second crank (26). At the same time, both ends of the feeding shaft (27) are hinged in the frame (6). The feeding shaft (27) is connected to the differential tooth (4). When the first connecting rod (13) swings, it drives the first crank (21), the transmission shaft (22) and the swing seat (23) to rotate. The rotation of the swing seat (23) drives the feeding shaft (27) to rotate through the first swing plate (24), the second swing plate (25) and the second crank (26). The feeding shaft (27) drives the differential tooth (4) to feed differentially.

3. The fabric feeding and presser foot lifting mechanism of the sewing machine according to claim 1, characterized in that... The second connecting rod (14) is connected to the pressure foot (5) via a pull rod linkage assembly (3). The pull rod linkage assembly (3) includes a swing block (31), a first pull rod (32), a rear lever (33), a second pull rod (34), a front lever (35), and a pressure foot lifting plate (36). The swing block (31) is hinged to the end of the second connecting rod (14). A swing shaft (37) is threaded through the swing block (31). The swing shaft (37) is fixed on the frame (6). The second connecting rod (14) drives the swing block (31) to rotate around the swing shaft (37). The middle part of the rear lever (33) is hinged to the frame (6) via the rear shaft and can swing flexibly with the rear shaft as the center of rotation. The middle part of the front lever (35) is hinged to the frame (6) via the rear shaft. The part is hinged to the frame (6) via the front pivot and can swing flexibly with the front pivot as the rotation center. The swing block (31) is provided with a swing connecting shaft. The two ends of the rear lever (33) are respectively provided with a first rear connecting shaft and a second rear connecting shaft. The two ends of the front lever (35) are respectively provided with a first front connecting shaft and a second front connecting shaft. The two ends of the first pull rod (32) hook the swing connecting shaft and the first rear connecting shaft respectively. The two ends of the second pull rod (34) hook the second rear connecting shaft and the first front connecting shaft respectively. The second front connecting shaft passes through the end of the presser foot lifting plate (36) so that the presser foot lifting plate (36) and the front lever (35) are hinged together. The presser foot (5) is connected to the presser foot lifting plate (36). When the second link (14) swings, it drives the swing block (31) to rotate around the swing axis (37). The rotation of the swing block (31) drives the rear lever (33) to rotate through the first pull rod (32). The rotation of the rear lever (33) drives the front lever (35) to rotate through the second pull rod (34). The rotation of the front lever (35) is converted into the up and down movement of the presser foot lifting plate (36), thereby completing the lifting and lowering of the presser foot (5).

4. The fabric feeding and presser foot lifting mechanism of the sewing machine according to claim 3, characterized in that... The linkage assembly (3) further includes a lifting transmission block (38), a lifting transmission rod (39), a presser foot motion guide (310), and a presser foot connecting plate (311). The bottom surface of the lifting transmission block (38) is in contact with the presser foot lifting plate (36) and moves up and down synchronously with the presser foot lifting plate (36). The presser foot lifting plate (36) has a lifting groove. The end of the lifting transmission block (38) has a lifting protrusion. The lifting protrusion is located in the lifting groove. The lifting transmission rod (39) is inserted and fixed inside the lifting transmission block (38). The presser foot motion guide (310) is fixed to the bottom of the lifting transmission rod (39). The presser foot connecting plate (311) is installed on the side of the presser foot motion guide (310). The presser foot (5) is fixed to the bottom of the presser foot connecting plate (311).

5. The fabric feeding and presser foot lifting mechanism of the sewing machine according to claim 1, characterized in that... A connecting ring is provided between the first cam (11) and the second cam (12). The first cam (11), the connecting ring and the second cam (12) are integrally formed. A first hinge block is formed on the side of the first cam (11). A long strip first hinge hole is formed on the first connecting rod (13). The first hinge block is located in the first hinge hole. A second hinge block (18) is formed on the side of the second cam (12). A long strip second hinge hole (17) is formed on the second connecting rod (14). The second hinge block (18) is located in the second hinge hole (17).

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