Cloth feeding mechanism of sewing machine

Abstract

The utility model belongs to the technical field of sewing machines, and particularly relates to a cloth feeding mechanism of a sewing machine, which comprises a feed dog frame, the tooth feeding assembly is connected to one end of the tooth frame and used for driving the tooth frame to move left and right; the feed lifting assembly is connected to the other end of the feed rack and used for driving the feed rack to move up and down; the feed lifting assembly comprises a feed lifting cam, a feed lifting connecting rod and a traction connecting rod, one end of the traction connecting rod is used for being hinged to a rack, and the other end of the traction connecting rod is hinged to the output end of the feed lifting crank. The lifting period of the feed dog frame is changed through the feed lifting connecting rod and the traction connecting rod, so that when the feed lifting assembly drives the feed dog frame to be lifted, the feed dog assembly can synchronously drive the feed dog frame to move left and right, and therefore a movement track which is overall in an oval shape is formed, and the cloth feeding mechanism has a better cloth feeding effect.

Description

Technical Field

[0001] This utility model belongs to the field of sewing machine technology, and specifically refers to a sewing machine fabric feeding mechanism. Background Technology

[0002] Chinese invention patent application 201210015052.7 discloses a continuous feeding mechanism for a sewing machine, which includes a feeding shaft, a lower shaft, a feeding crank, a first lifting tooth connecting rod, a lifting tooth cam, a first tooth frame, and a first feeding tooth.

[0003] This patent achieves the lifting of the feed dog by the cooperation of a lifting cam and a first lifting linkage, and in conjunction with a feed crank, realizes the feeding action of the sewing machine. However, since the feed dog in this patent is only implemented by the connected lifting cam and the first lifting linkage, its motion cycle is not well coordinated with the feed crank, which can easily lead to the actual motion trajectory of the feed dog being as follows: Figure 1 The hill-like shape shown affects the fabric feeding effect. Summary of the Invention

[0004] The purpose of this invention is to provide a fabric feeding mechanism for a sewing machine.

[0005] The purpose of this utility model is achieved as follows:

[0006] The sewing machine fabric feeding mechanism includes,

[0007] Dental frame, equipped with a feeding toother;

[0008] A tooth feeding assembly, connected to one end of the dental frame, is used to drive the dental frame to move left and right;

[0009] A tooth lifting assembly, connected to the other end of the dental frame, is used to drive the dental frame to move up and down; the tooth lifting assembly includes:

[0010] The tooth-lifting cam is driven to rotate by the tooth-lifting shaft;

[0011] The tooth-lifting crank has an input end and an output end; the input end is rotatably connected to the tooth-lifting cam and is driven by the tooth-lifting cam to move.

[0012] A tooth-lifting linkage, one end of which is connected to the tooth frame, and the other end of which is hinged to the output end of the tooth-lifting crank; and

[0013] The traction link has one end hinged to the frame and the other end hinged to the output end of the lifting crank.

[0014] Furthermore, the tooth-lifting shaft is the motor shaft of the tooth-lifting motor.

[0015] Furthermore, the tooth-lifting crank is connected to a tooth-lifting shaft, and the tooth-lifting connecting rod and the traction connecting rod are both rotated onto the tooth-lifting shaft.

[0016] Furthermore, the tooth-lifting shaft is located below the tooth-lifting cam, and the tooth-lifting connecting rod is connected to the front end of the tooth-lifting shaft and rotates upward to the tooth frame.

[0017] Furthermore, a hinge pin is provided at one end of the traction link that is hinged to the frame. The hinge pin is fixed on the frame, and one end of the traction link is rotatably mounted on the hinge pin.

[0018] Furthermore, the tooth-lifting cam includes an eccentric wheel portion, which is circular, and the axis of the eccentric wheel portion is offset from the axis of the tooth-lifting shaft; the input end of the tooth-lifting crank is rotatably mounted on the eccentric wheel portion.

[0019] The outstanding and beneficial technical effects of this utility model compared to the prior art are:

[0020] By using the tooth-lifting linkage and traction linkage of this patent to change the lifting cycle of the dental frame, the tooth-feeding component can simultaneously drive the dental frame to move left and right when the tooth-lifting component drives the dental frame to lift, thereby forming an overall elliptical motion trajectory, so that the feeding mechanism described in this patent has a better feeding effect. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the fabric feeding trajectory of the existing fabric feeding mechanism.

[0022] Figure 2 This is a schematic diagram of the fabric feeding mechanism in Example 1.

[0023] Figure 3 This is a schematic diagram of the dental frame and tooth lifting assembly in Example 1.

[0024] Figure 4 This is an exploded view of the tooth-lifting assembly in Example 1.

[0025] Figure 5 This is a schematic diagram of the fabric feeding trajectory of the fabric feeding mechanism in this patent application.

[0026] Figure 6 This is a schematic diagram of the fabric feeding mechanism in Example 2.

[0027] The meaning of the labels in the diagram:

[0028] 1. Dental frame; 11. Feeding dog;

[0029] 2. Tooth feeding assembly; 21. Tooth feeding seat; 22. Tooth feeding crank; 23. Tooth feeding connecting rod; 24. Tooth feeding motor; 25. Linkage mechanism; 251. Linkage cam; 252. Linkage crank; 253. Linkage swing arm;

[0030] 3. Tooth lifting assembly; 31. Tooth lifting cam; 311. Eccentric wheel; 32. Tooth lifting crank; 33. Tooth lifting connecting rod; 34. Traction connecting rod; 35. Tooth lifting motor; 351. Tooth lifting pressure shaft; 36. Tooth lifting shaft; Detailed Implementation

[0031] The present invention will be further described below with reference to specific embodiments:

[0032] Example 1:

[0033] The sewing machine feeding mechanism includes a feed dog 1, a feed dog assembly 2, and a lift dog assembly 3. The sewing machine feeding mechanism is used to fix the feed dog 11 on a machine frame. The feed dog 11 is fixed on the feed dog 1 by screws. The lift dog assembly 3 is located on the left side of the feed dog 1, and the feed dog assembly 2 is located on the right side of the feed dog 1.

[0034] like Figure 2 As shown, the tooth feeding assembly 2 includes a tooth feeding seat 21, which is connected to a tooth feeding crank 22 that drives it to reciprocate. The tooth feeding crank 22 is then connected to a tooth feeding connecting rod 23, which is connected to a tooth feeding motor 24. The tooth feeding motor 24 is fixed on the housing. The tooth feeding motor 24 drives the tooth feeding connecting rod 23 to move, which in turn drives the tooth feeding crank 22 to swing, thereby driving the tooth feeding seat 21 to swing. The swing of the tooth feeding seat 21 drives the dental frame 1 to move left and right.

[0035] like Figure 2 , 3 As shown, the tooth lifting assembly 3 is connected to the left side of the dental frame 1 and is used to drive the dental frame 1 to move up and down. The tooth lifting assembly 3 includes a tooth lifting cam 31, a tooth lifting crank 32, a tooth lifting connecting rod 33, and a traction connecting rod 34. The tooth lifting cam 31 is driven to rotate by a tooth lifting shaft 351. The tooth lifting cam 31 includes an eccentric wheel portion 311, which is circular, and the axis of the eccentric wheel portion 311 is offset from the axis of the tooth lifting shaft. The input end of the tooth lifting crank 32 is rotatably mounted on the eccentric wheel portion 311. The tooth-lifting motor 35 is fixed on the frame. The tooth-lifting cam 31 is provided on the motor shaft of the tooth-lifting motor 35, which is the tooth-lifting shaft 351. The tooth-lifting crank 32 is connected to one end face of the tooth-lifting cam 31 and is set downward. A tooth-lifting shaft 36 is fixed on the other end of the tooth-lifting crank 32 along the motor shaft of the tooth-lifting motor 35. The tooth-lifting shaft 36 is located on the lower side of the tooth-lifting cam 31. The tooth-lifting connecting rod 33 and the traction connecting rod 34 are rotatably connected on the tooth-lifting shaft 36.

[0036] Combination Figure 3 , 4As shown, the tooth-lifting shaft 36 is equipped with a bearing sleeve, through which the traction connecting rod 34 is first connected. The traction connecting rod 34 is arranged laterally, and its other end is rotatably connected to the frame located on the left side of the tooth-lifting cam 31. A hinge pin 341 is provided on one end of the traction connecting rod 34 that is hinged to the frame. The hinge pin 341 is fixed to the frame by fasteners, and one end of the traction connecting rod 34 is rotatably mounted on the hinge pin 341. The tooth-lifting connecting rod 33 is also connected to the traction connecting rod 34 via a bearing sleeve, and extends upward to the left side of the tooth frame 1, achieving connection through a hinge structure. During operation, the tooth-lifting motor 35 drives the tooth-lifting cam 31 to rotate. The rotation of the tooth-lifting cam 31 causes the tooth-lifting crank 32 to move up and down and swing, thereby moving the tooth-lifting shaft 36, which in turn drives the tooth-lifting connecting rod 33 to move up and down, thereby moving the tooth frame 1 up and down. At the same time, the traction connecting rod 34 is connected to the tooth-lifting shaft 36, which pulls the lower end of the tooth-lifting connecting rod 33, thereby changing the movement trajectory of the tooth-lifting connecting rod 33 and making it better cooperate with the tooth-feeding assembly 2.

[0037] refer to Figure 5 By using the tooth-lifting linkage 33 and traction linkage 34 of this patent to change the lifting cycle of the dental frame 1, the tooth-lifting assembly 3 can drive the dental frame 1 to lift, while the tooth-feeding assembly 2 can synchronously drive the dental frame 1 to move left and right, thereby forming a... Figure 5 As shown, the overall elliptical motion trajectory enables the fabric feeding mechanism described in this patent to have a better fabric feeding effect.

[0038] Example 2:

[0039] like Figure 6 As shown, most of the structure of this patent is the same as that of Embodiment 1. The difference is that this embodiment does not have the tooth-feeding motor 24, but only a tooth-lifting motor 35. The tooth-lifting motor 35 is mounted on the tooth-lifting shaft 351. The front end of the tooth-lifting shaft 351 is connected to the tooth-lifting cam 31, and the rear end of the tooth-lifting shaft 351 is connected to a linkage mechanism 25. The tooth-feeding assembly 2 is operated by the linkage mechanism 25. The linkage mechanism 25 specifically includes a linkage cam 251, which drives a linkage crank 252. The linkage crank 252 drives a linkage swing arm 253, which drives the tooth-feeding seat 21 to work, thereby realizing the operation of the tooth-feeding assembly 2.

[0040] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

[0041] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the disclosed technical content. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0042] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0043] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

Claims

1. Sewing machine fabric feeding mechanism, include, Dental frame (1), with feeding teeth (11) on the dental frame (1); The tooth delivery assembly (2) is connected to one end of the dental frame (1) and is used to drive the dental frame (1) to move left and right; A tooth lifting assembly (3), connected to the other end of the dental frame (1), is used to drive the dental frame (1) to move up and down; characterized in that, The tooth lifting assembly (3) includes: The tooth-lifting cam (31) is driven to rotate by the tooth-lifting shaft (351); The tooth-lifting crank (32) has an input end at one end and an output end at the other end; the input end is rotatably connected to the tooth-lifting cam (31) and is driven to move by the tooth-lifting cam (31); The tooth lifting linkage (33) has one end connected to the tooth frame (1) and the other end hinged to the output end of the tooth lifting crank (32); as well as The traction link (34) has one end hinged to the frame and the other end hinged to the output end of the lifting crank (32).

2. The sewing machine fabric feeding mechanism according to claim 1, characterized in that: The tooth lifting shaft (351) is the motor shaft of the tooth lifting motor (35).

3. The sewing machine fabric feeding mechanism according to claim 1, characterized in that: The tooth-lifting crank (32) is connected to a tooth-lifting shaft (36), and the tooth-lifting connecting rod (33) and the traction connecting rod (34) are both rotated onto the tooth-lifting shaft (36).

4. The sewing machine fabric feeding mechanism according to claim 3, characterized in that: The tooth lifting shaft (36) is located below the tooth lifting cam (31), and the tooth lifting connecting rod (33) is connected to the front end of the tooth lifting shaft (36) and rotates upward to the tooth frame (1).

5. The sewing machine fabric feeding mechanism according to claim 1, characterized in that: The traction link (34) is hinged to one end of the frame and is provided with a hinge pin (341). The hinge pin (341) is fixed on the frame, and one end of the traction link (34) is rotatably mounted on the hinge pin (341).

6. The sewing machine fabric feeding mechanism according to claim 1, characterized in that: The tooth-lifting cam (31) includes an eccentric wheel portion (311), which is circular, and the axis of the eccentric wheel portion (311) is offset from the axis of the tooth-lifting shaft (351); the input end of the tooth-lifting crank (32) is rotatably mounted on the eccentric wheel portion (311).

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