Middle presser foot eccentric wheel mechanism of sewing machine

Abstract

The utility model relates to the technical field of sewing machines, and discloses a sewing machine middle presser foot eccentric wheel mechanism which comprises a driving mechanism and a linkage mechanism, the driving mechanism comprises a main shaft, an eccentric wheel is fixedly connected to the main shaft, an eccentric ring is movably arranged on the outer side of the eccentric wheel, and the eccentric ring is connected with the linkage mechanism in a matched mode. The linkage mechanism comprises a clamping fixing block, a driven rod is fixedly connected into the clamping fixing block, a swing mechanism is arranged at the end of the driven rod, an ejector rod is arranged at the lower end of the swing mechanism, an auxiliary adjusting piece is arranged on the eccentric ring, and the auxiliary adjusting piece can drive the ejector rod to rise in height. According to the novel presser foot eccentric wheel mechanism applied to the sewing machine, by arranging the linkage mechanism and the swing mechanism, the number of parts, swinging up and down, of the ejector rod is reduced, later maintenance of the sewing machine is facilitated, abrasion between the parts is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to an eccentric wheel mechanism for a presser foot in a sewing machine. Background Art

[0002] The sewing machine presses the fabric with the presser foot, passes the thread from the bottom to the top of the fabric through the thimble, and sews the fabric. The traditional presser foot up and down mechanism requires a multi-link drive to achieve the effect of the presser foot moving up and down reciprocatingly.

[0003] However, the traditional presser foot up and down mechanism requires multi-link assembly for coordination, which causes trouble for the later maintenance of the sewing machine. Due to too many parts, the maintenance cost is high and the maintenance efficiency is low. In addition, the large number of parts will cause greater friction between each other, which in turn causes wear of the parts, seriously affecting the use of the sewing machine.

[0004] In order to solve the above problems, the present application proposes an eccentric wheel mechanism for a presser foot in a sewing machine. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides an eccentric wheel mechanism for a presser foot in a sewing machine, so as to at least solve one of the problems raised by the background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an eccentric wheel mechanism for a presser foot in a sewing machine, comprising a driving mechanism and a linkage mechanism, wherein the driving mechanism comprises a main shaft, an eccentric wheel is fixedly connected to the main shaft, an eccentric ring is movably arranged on the outer side of the eccentric wheel, the eccentric ring is matched and connected with the linkage mechanism, the linkage mechanism comprises a clamping and fixing block, a driven rod is fixedly connected to the clamping and fixing block, a swing mechanism is arranged at the end of the driven rod, a push rod is arranged at the lower end of the swing mechanism, an auxiliary adjusting member is arranged on the eccentric ring, and the auxiliary adjusting member can drive the push rod to rise in height.

[0007] A further technical improvement of the utility model is that a first connecting block is fixedly connected to the outer side of the eccentric ring near the center end of the main shaft, a transmission block is matched with the first connecting block, a swing block is matched with the transmission block, the swing block is sleeved and connected to the driven rod, and the clamping fixed block is arranged on the outer side of the swing block, and the connection points in the linkage mechanism are all connected with a rotating shaft.

[0008] A further technical improvement of the utility model is that the swing mechanism includes a fixed plate, a clearance hole is opened on the fixed plate, a movable guide plate is arranged in the clearance hole, the end of the guide plate is fixedly connected to the driven rod, and the end of the driven rod is arranged through the clearance hole, a rocker rod is rotatably connected to the guide plate, the lower end of the rocker rod is rotatably connected to a limiting block, the limiting block is fixedly connected to the top rod, and the connection points in the swing mechanism are also connected through a rotating shaft.

[0009] A further technical improvement of the utility model is that the auxiliary adjusting member comprises a motor, a clamping driving block is provided at the output end of the motor, the end of the clamping driving block is rotatably connected to an auxiliary rod, the outer side wall of the eccentric ring is fixedly connected to a second connecting block, the upper end of the auxiliary rod is rotatably connected to the second connecting block, and the connection points of the auxiliary adjusting member are all connected via a rotating shaft.

[0010] A further technical improvement of the utility model is that the clamping drive block and the output end of the motor are detachably arranged and fixedly connected by screws, and the clamping fixing block and the driven rod are detachably arranged and fixedly connected by screws.

[0011] A further technical improvement of the present invention is that the second connecting block is arranged 30° counterclockwise above the first connecting block.

[0012] The utility model provides an eccentric wheel mechanism for a presser foot in a sewing machine, which has the following beneficial effects:

[0013] This new type is applied to the eccentric wheel mechanism of the presser foot in a sewing machine. By setting a linkage mechanism and a swing mechanism, the number of parts for the top rod to swing up and down is reduced, which is convenient for the later maintenance of the sewing machine, reduces the wear between parts, and increases the service life.

[0014] This new type is applied to the eccentric wheel mechanism of the presser foot in a sewing machine. By setting an auxiliary adjustment part, the motor drives the auxiliary rod to drive the eccentric ring to rotate at a larger angle, so that the top rod rises to a greater height and can adapt to thicker fabrics. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0016] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the driving mechanism and linkage mechanism inside the casing of the utility model;

[0018] Figure 3This is a schematic diagram of the auxiliary rod and fixed plate structure of the utility model;

[0019] Figure 4 It is a plan view of the linkage mechanism of the utility model;

[0020] Figure 5 This is a schematic diagram of the linkage mechanism structure of the utility model;

[0021] Figure 6 This is a schematic diagram of the structure of the auxiliary adjustment member of the utility model;

[0022] Figure 7 This is a schematic diagram of the structure of the swing mechanism of the utility model;

[0023] Figure 8 for Figure 3 Enlarged structural diagram at A in the middle.

[0024] In the figure: 1. body; 2. casing; 3. main shaft; 4. push rod; 5. eccentric wheel; 6. eccentric ring; 7. first connecting block; 8. second connecting block; 9. transmission block; 10. swing block; 11. fixed block; 12. driven rod; 13. fixed plate; 14. guide plate; 15. auxiliary rod; 16. limit block; 17. drive block; 18. rotating shaft; 19. motor; 20. swing arm. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] See also Figure 1-8 A presser foot eccentric wheel mechanism in a sewing machine comprises a driving mechanism and a linkage mechanism, the driving mechanism comprises a main shaft 3, an eccentric wheel 5 is fixedly connected to the main shaft 3, an eccentric ring 6 is movably arranged on the outer side of the eccentric wheel 5, the eccentric ring 6 is matched and connected with the linkage mechanism, the linkage mechanism comprises a clamping and fixing block 11, a driven rod 12 is fixedly connected inside the clamping and fixing block 11, a swing mechanism is arranged at the end of the driven rod 12, a push rod 4 is arranged at the lower end of the swing mechanism, an auxiliary adjusting member is arranged on the eccentric ring 6, and the auxiliary adjusting member can drive the push rod 4 to rise in height.

[0027] Specific working principle and implementation method: In the traditional sewing machine, the multi-link connection method is used to drive the push rod 4 up and down to drive the presser foot to press the cloth, but the traditional multi-link is difficult to maintain, severely worn and easily damaged; through the present design, the rotation of the main shaft 3 can be used as the drive, and the outer end of the main shaft 3 is driven by the driving member, and the driven rod 12 is limited to rotate inside the casing 2, and the rotation of the main shaft 3 drives the eccentric wheel 5 to rotate. When the eccentric wheel 5 rotates, the sleeve eccentric ring 6 is driven to swing left and right, and the left and right swing of the eccentric ring 6 drives the linkage mechanism to produce a linkage effect, and the clamping fixed block 11 is driven by the linkage mechanism to drive the driven rod 12 to rotate back and forth, and the driven rod 12 drives the swing mechanism to swing back and forth when it rotates back and forth. The push rod 4 is arranged at the lower end of the swing mechanism, and the push rod 4 is driven by the swing mechanism to move up and down in the casing 2 to achieve the presser foot effect; the advantage of such a design is that, through the linkage mechanism and the swing mechanism, the number of parts of the push rod 4 that swing up and down is reduced, which is convenient for the later maintenance and maintenance of the sewing machine, and reduces the wear between parts and improves the service life.

[0028] like Figure 5 As shown, the eccentric ring 6 is fixedly connected to the outer side of the center end of the main shaft 3 with a first connecting block 7, and the first connecting block 7 is matched with a transmission block 9, and the transmission block 9 is matched with a swing block 10, the swing block 10 is sleeved and connected with the driven rod 12, and the clamping fixed block 11 is arranged on the outer side of the swing block 10, and the connection points in the linkage mechanism are all connected with a rotating shaft 18; the main shaft 3 rotates and the eccentric wheel 5 rotates with the main shaft 3, due to the eccentric setting, the rotating protruding part of the eccentric wheel 5 pushes the eccentric ring 6 to move outward, and when the rotating protruding part of the eccentric wheel 5 rotates inward, it pushes the eccentric ring 6 to move inward, thereby driving the eccentric ring 6 to move back and forth, and the eccentric ring 6 drives the first connecting block 7 to swing back and forth, and the transmission block 9 connected to the first connecting block 7 through the rotating shaft 18 moves left and right to drive the swing block 10 to swing back and forth with the driven rod 12 as the center, thereby driving the driven rod 12 to rotate back and forth, and then the driven rod 12 drives the swing mechanism to drive the top rod 4 to swing up and down.

[0029] like Figure 7 As shown, the swing mechanism includes a fixed plate 13, a clearance hole is opened on the fixed plate 13, a movable guide plate 14 is arranged in the clearance hole, the end of the guide plate 14 is fixedly connected to the driven rod 12, and the end of the driven rod 12 is arranged through the clearance hole, the guide plate 14 is rotatably connected to the swing rod 20, the lower end of the swing rod 20 is rotatably connected to the limit block 16, the limit block 16 is fixedly connected to the top rod 4, and the connection points in the swing mechanism are also connected through the rotating shaft 18; the fixed plate 13 is fixed in the casing 2, and when the driven rod 12 reciprocates, the guide plate 14 is driven to reciprocate and swing with the driven rod 12 as the center of the circle, and then the guide plate 14 drives the swing rod 20 to swing reciprocatingly up and down, so that the limit block 16 and the top rod 4 move up and down within the casing 2.

[0030] As shown in the figure, the auxiliary adjusting member includes a motor 19, and a clamping driving block 17 is provided at the output end of the motor 19. The end of the clamping driving block 17 is rotatably connected to the auxiliary rod 15, and the outer wall of the eccentric ring 6 is fixedly connected to the second connecting block 8. The upper end of the auxiliary rod 15 is rotatably connected to the second connecting block 8, and the connection points of the auxiliary adjusting member are all connected through the rotating shaft 18; the motor 19 is fixed to the lower end of the machine body 1. When the cloth pressed by the presser foot passes, the motor 19 is started to drive the clamping driving block 17, and the auxiliary rod 15 is driven to swing up and down through the clamping driving block 17. The upper end of the auxiliary rod 15 is connected to the second connecting block 8 through the rotating shaft 18. The eccentric ring 6 is driven to swing counterclockwise through the second connecting block 8 to a larger angle, thereby driving the driven rod 12 to rotate at a larger range of angles, so that the top rod 4 can move upward again at the height of the foundation, and thus can adapt to thicker cloth.

[0031] like Figure 4 and Figure 6 As shown, the clamping drive block 17 and the output end of the motor 19 are detachably arranged and fixedly connected by screws, and the clamping fixing block 11 and the driven rod 12 are detachably arranged and fixedly connected by screws; the clamping drive block 17 and the clamping fixing block 11 are fastened by screws, which facilitates the maintenance and care of the clamping drive block 17 and the clamping fixing block 11, and the operation is convenient and quick.

[0032] like Figure 5 As shown, the second connecting block 8 is located 30° counterclockwise above the first connecting block 7; the second connecting block 8 is located 30° counterclockwise above the first connecting block 7 to increase the rotation angle of the eccentric ring 6. Through this 30° angle, the top rod 4 can be moved higher upward to facilitate the placement of the cloth.

[0033] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A presser foot eccentric wheel mechanism in a sewing machine, characterized in that: The invention comprises a driving mechanism and a linkage mechanism, wherein the driving mechanism comprises a main shaft (3), an eccentric wheel (5) is fixedly connected to the main shaft (3), an eccentric ring (6) is movably arranged outside the eccentric wheel (5), the eccentric ring (6) is matched and connected to the linkage mechanism, the linkage mechanism comprises a clamping and fixing block (11), a driven rod (12) is fixedly connected inside the clamping and fixing block (11), a swing mechanism is arranged at the end of the driven rod (12), a push rod (4) is arranged at the lower end of the swing mechanism, and an auxiliary adjustment member is arranged on the eccentric ring (6), and the auxiliary adjustment member can drive the push rod (4) to rise in height.

2. The eccentric wheel mechanism for presser foot in a sewing machine according to claim 1, characterized in that: A first connecting block (7) is fixedly connected to the outer side of the eccentric ring (6) near the center of the main shaft (3); a transmission block (9) is matched with the first connecting block (7); a swing block (10) is matched with the transmission block (9); the swing block (10) is sleeved and connected to the driven rod (12); a clamping fixed block (11) is arranged outside the swing block (10); and the connection points in the linkage mechanism are all connected to a rotating shaft (18).

3. The eccentric wheel mechanism for presser foot in a sewing machine according to claim 1, characterized in that: The swing mechanism comprises a fixed plate (13), a clearance hole is formed on the fixed plate (13), a movable guide plate (14) is arranged in the clearance hole, the end of the guide plate (14) is fixedly connected to the driven rod (12), and the end of the driven rod (12) is arranged through the clearance hole, the guide plate (14) is rotatably connected to a swing rod (20), the lower end of the swing rod (20) is rotatably connected to a limit block (16), the limit block (16) is fixedly connected to the top rod (4), and the connection points in the swing mechanism are also connected via a rotating shaft (18).

4. The eccentric wheel mechanism for presser foot in a sewing machine according to claim 1, characterized in that: The auxiliary adjustment member comprises a motor (19), an output end of the motor (19) is provided with a clamping drive block (17), an end of the clamping drive block (17) is rotatably connected to an auxiliary rod (15), an outer side wall of the eccentric ring (6) is fixedly connected to a second connection block (8), an upper end of the auxiliary rod (15) is rotatably connected to the second connection block (8), and the connection points of the auxiliary adjustment member are all connected via a rotating shaft (18).

5. The eccentric wheel mechanism for presser foot in a sewing machine according to claim 4, characterized in that: The clamping drive block (17) and the output end of the motor (19) are detachably arranged and fixedly connected by screws, and the clamping fixing block (11) and the driven rod (12) are detachably arranged and fixedly connected by screws.

6. The eccentric wheel mechanism for presser foot in a sewing machine according to claim 4, characterized in that: The second connecting block (8) is located 30° counterclockwise above the first connecting block (7).

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