Presser foot driving device and machine head of computerized embroidery machine

Abstract

The invention discloses a presser foot driving device and a machine head of a computerized embroidery machine, the presser foot driving device comprises a connecting rod mechanism, the connecting rod mechanism comprises a plurality of hinging positions, and when a presser foot driver is located at the lowest position and the highest position, the connecting rod mechanism is hinged to the connecting rod mechanism. The multiple hinge positions include a first hinge position, a second hinge position and a third hinge position which are adjacent to one another, a connecting line of a hinge center (A or D) corresponding to the first hinge position and a hinge center (B or E) corresponding to the second hinge position, and a connecting line of a hinge center (B or E) corresponding to the third hinge position. The included angle between the connecting lines of the hinge center (C or F) corresponding to the third hinge position and the hinge center (B or E) corresponding to the second hinge position ranges from 170 degrees to 190 degrees, by adjusting the included angle, synchronous movement of the presser foot driver and a needle rod is facilitated, instant impact force generated when the presser foot driver makes contact with a presser foot sliding sleeve is reduced as much as possible, noise is reduced, and the service life of the presser foot sliding sleeve is prolonged. And meanwhile, the cloth pressing pause time of the presser foot is ensured.

Description

Technical Field

[0001] The invention generally relates to the technical field of computer embroidery machines, and in particular to a presser foot driving device and a machine head of a computer embroidery machine. Background Art

[0002] In the technical field of computer embroidery machines, the head of a computer embroidery machine includes a presser foot, a presser foot driver, a presser foot cam and a transmission mechanism, wherein the transmission mechanism is located between the presser foot cam and the presser foot driver and connects the two. The presser foot cam rotates, thereby causing the presser foot driver to move, and the presser foot driver drives the presser foot to move.

[0003] However, for high-speed embroidery machines, the above-mentioned transmission mechanism is noisy. Summary of the invention

[0004] The present application hopes to provide a presser foot drive device and a head of a computer embroidery machine, which are at least used to synchronize the movement of the presser foot drive and the needle bar, and to reduce the instantaneous impact force of the presser foot drive and the presser foot sleeve as much as possible to reduce noise.

[0005] The invention provides a presser foot driving device, comprising: a presser foot cam assembly, a presser foot driver and a connecting rod mechanism, wherein the presser foot cam assembly comprises a presser foot cam.

[0006] The presser foot driver performs linear reciprocating motion; the connecting rod mechanism is located between the presser foot driver and the presser foot cam, and connects the two so that the presser foot driver performs linear reciprocating motion.

[0007] The connecting rod mechanism includes multiple hinge positions. When the presser foot driver is in the lowest position and the highest position, there are three adjacent first hinge positions, a second hinge position and a third hinge position among the multiple hinge positions. The angle between a connecting line between a hinge center corresponding to the first hinge position and a hinge center corresponding to the second hinge position and a connecting line between a hinge center corresponding to the third hinge position and a hinge center corresponding to the second hinge position is between 170° and 190°.

[0008] As an implementable manner, at least one of the connecting rod corresponding to the first hinge position, the connecting rod corresponding to the second hinge position, and the connecting rod corresponding to the third hinge position is a reciprocating swinging rod.

[0009] As an implementable manner, the connecting rod mechanism includes a first two-hole connecting rod, a second two-hole connecting rod, a first three-hole connecting rod and a second three-hole connecting rod. The presser foot cam, the first three-hole connecting rod, the first two-hole connecting rod, the second three-hole connecting rod, and the second two-hole connecting rod are connected in sequence, one hole of the first three-hole connecting rod is used to be hinged on the shell of the machine head, one hole of the second three-hole connecting rod is used to be hinged on the shell of the machine head, and the second two-hole connecting rod is connected to the presser foot driver so that the presser foot driver performs linear reciprocating motion.

[0010] As an achievable method, when the presser foot driver is in its lowest position, the hinge center corresponding to a hole of the first three-hole connecting rod, the hinge center corresponding to the hinge position of the first three-hole connecting rod and the first two-hole connecting rod, and the hinge center corresponding to the hinge position of the first two-hole connecting rod and the second three-hole connecting rod are adjacent to each other, and the connecting line between the hinge center A and the hinge center B and the connecting line between the hinge center C and the hinge center B form an angle α, and α is between 170° and 190°.

[0011] As an achievable method, when the presser foot driver is in its highest position, the hinge center corresponding to a hole of the second three-hole connecting rod, the hinge center corresponding to the hinge position of the second three-hole connecting rod and the second two-hole connecting rod, and the hinge center corresponding to the hinge position of the second two-hole connecting rod and the presser foot driver are adjacent to each other, and the connecting line between the hinge center D and the hinge center E and the connecting line between the hinge center F and the hinge center E form an angle β, and β is between 170° and 190°.

[0012] As an implementable manner, the first two-hole connecting rod comprises a first part and a second part which are independent of each other, and a hole of the first three-hole connecting rod and a hole of the second three-hole connecting rod are located between the first part and the second part.

[0013] As an implementable manner, a hinge shaft sleeved with a bearing passes through a hole of the first three-hole connecting rod, the first part and the second part, so that the first three-hole connecting rod and the first two-hole connecting rod have rolling friction; Another hinge shaft sleeved with a bearing passes through a hole of the second three-hole connecting rod, the first part and the second part, so that the second three-hole connecting rod and the first two-hole connecting rod have rolling friction.

[0014] As an implementable manner, the second two-hole connecting rod comprises a third part and a fourth part which are independent of each other, and another eyelet of the second three-hole connecting rod and the presser foot driver are at least partially located between the third part and the fourth part.

[0015] As an achievable manner, a hinged shaft sleeved with a bearing passes through another eyelet of the second three-hole connecting rod, the third part and the fourth part, so that the second two-hole connecting rod and the second three-hole connecting rod are in rolling friction; Another hinged shaft sleeved with a bearing passes through the presser foot driver, the third part and the fourth part, so that the presser foot driver and the second two-hole connecting rod have rolling friction.

[0016] The present invention also provides a head of a computer embroidery machine, comprising a housing and the above-mentioned presser foot driving device, wherein the presser foot driving device is located in the housing. One eye of the first three-hole connecting rod is hinged on the housing of the head, and one eye of the second three-hole connecting rod is hinged on the housing of the head.

[0017] In the above scheme, the connecting rod mechanism of the present application includes multiple hinged positions. When the presser foot driver is at the lowest position and the highest position, there are three adjacent first hinged positions, second hinged positions and third hinged positions among the multiple hinged positions. The connecting line of the hinge center (A or D) corresponding to the first hinged position and the hinge center (B or E) corresponding to the second hinged position, and the connecting line of the hinge center (C or F) corresponding to the third hinged position and the hinge center (B or E) corresponding to the second hinged position have an angle between 170° and 190°. By adjusting the size of the angle, it is helpful to synchronize the movement of the presser foot driver and the needle bar, and to reduce the instantaneous impact force of the presser foot driver and the presser foot sliding sleeve as much as possible to reduce noise. At the same time, the pause time of the presser foot pressing the cloth is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 A schematic diagram of a three-dimensional structure of a machine head provided by an embodiment of the present invention; Figure 2 An exploded schematic diagram of a machine head provided by an embodiment of the present invention; Figure 3 A partial exploded schematic diagram of a machine head provided by an embodiment of the present invention; Figure 4 Schematic diagram of the movement of the presser foot driving device provided in an embodiment of the present invention Figure 1 ; Figure 5 A schematic diagram of the motion of the presser foot driving device provided in an embodiment of the present invention Figure 2 ; Figure 6 A schematic diagram of the motion of the presser foot driving device provided in an embodiment of the present invention Figure 3 ; Figure 7 A schematic diagram of the motion of the presser foot driving device provided in an embodiment of the present invention Figure 4 ; Figure 8 It is a motion curve diagram of the presser foot driver and the needle bar in the related art; Fig. 9 A motion curve diagram of a presser foot driver and a needle bar provided in an embodiment of the present invention; The presser foot cam 10, the first three-hole connecting rod 20, the first eyelet 21, the second eyelet 22, and the third eyelet 23; The first two-hole connecting rod 30 , the second three-hole connecting rod 40 , the fourth eyelet 41 , the fifth eyelet 42 , the sixth eyelet 43 , the second two-hole connecting rod 50 , the presser foot driver 60 , the guide rod 70 , and the bearing 80 . DETAILED DESCRIPTION

[0019] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0020] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] The computer embroidery machine comprises a frame, a plurality of machine heads and a plurality of rotary hook boxes.

[0022] The frame includes a main beam and a lower frame, and a plurality of machine heads are arranged at equal intervals in the length direction of the main beam. A plurality of rotary hook boxes are arranged at equal intervals in the length direction of the lower frame. The rotary hook boxes correspond to the machine heads one by one, and the rotary hook boxes are located directly below the machine heads.

[0023] The machine head comprises a casing and a presser foot driving device located in the casing.

[0024] like Figure 1 and Figure 2 As shown, the presser foot driving device includes a presser foot cam assembly, a presser foot driver 60, a connecting rod mechanism, a presser foot, a needle bar and a guide rod 70. The guide rod 70 and the needle bar are both arranged in a vertical direction, and the presser foot driver 60 is sleeved on the guide rod 70, and the presser foot driver 60 performs a linear reciprocating motion along the guide rod 70. The presser foot is connected to the needle bar through a presser foot sliding sleeve, and the presser foot moves upward or downward under the cooperation of the presser foot driver 60 and the presser foot sliding sleeve.

[0025] The presser foot cam assembly includes a presser foot cam 10, which is sleeved on the upper shaft. The upper shaft rotates to drive the presser foot cam 10 to rotate. The connecting rod mechanism is arranged between the presser foot cam 10 and the presser foot driver 60. The presser foot cam 10 moves the connecting rod mechanism, and the connecting rod mechanism makes the presser foot driver 60 perform linear reciprocating motion along the guide rod 70.

[0026] The connecting rod mechanism includes a first two-hole connecting rod 30, a second two-hole connecting rod 50, a first three-hole connecting rod 20 and a second three-hole connecting rod 40. Figure 2 As shown, the presser foot cam 10 , the first three-hole connecting rod 20 , the first two-hole connecting rod 30 , the second three-hole connecting rod 40 , and the second two-hole connecting rod 50 are connected in sequence, and the second two-hole connecting rod 50 is hinged to the presser foot driver 60 .

[0027] The first three-hole connecting rod 20 includes a first eyelet 21, a second eyelet 22 and a third eyelet 23, and the first eyelet 21, the second eyelet 22 and the third eyelet 23 can be arranged in a triangle. The first hinge shaft passes through the first eyelet 21, and the first hinge shaft can be connected to the housing through a bearing. The presser foot cam 10 is hingedly connected to the second eyelet 22.

[0028] The second three-hole connecting rod 40 has the same structure as the first three-hole connecting rod 20, and also includes a fourth eyelet 41, a fifth eyelet 42 and a sixth eyelet 43, which are arranged in a triangle. The second hinge shaft passes through the sixth eyelet 43, and the second hinge shaft can be connected to the housing through a bearing.

[0029] The first two-hole connecting rod 30 includes a first part 31 and a second part 32 which are independent of each other, and the first part 31 and the second part 32 are in the shape of a long strip. The second three-hole connecting rod 40 is arranged close to the first three-hole connecting rod 20, so that the fourth eyelet 41 is close to the third eyelet 23. The first part 31 and the second part 32 are respectively located on both sides of the fourth eyelet 41 and the third eyelet 23, and the third hinge shaft passes through the third eyelet 23, the first part 31, and the second part 32, so that the first two-hole connecting rod 30 is hinged to the first three-hole connecting rod 20; the fourth hinge shaft passes through the fourth eyelet 41, the first part 31, and the second part 32, so that the first two-hole connecting rod 30 is hinged to the second three-hole connecting rod 40. In this arrangement, the left and right sides of the first three-hole connecting rod 20 and the second three-hole connecting rod 40 are subjected to the force, which helps to suppress the shaking of the first three-hole connecting rod 20 and the second three-hole connecting rod 40, so that the presser foot driver 60 can stably and reliably reciprocate in the vertical direction.

[0030] In addition, if Figure 3 As shown, a bearing 80 is sleeved on the third hinge shaft, so that the hinge of the first two-hole connecting rod 30 and the first three-hole connecting rod 20 is rolling friction, reducing the friction at the hinge, which helps to suppress the noise at the hinge; at the same time, it helps the presser foot driver 60 to move stably and reliably; similarly, a bearing 80 is sleeved on the fourth hinge shaft, so that the hinge of the first two-hole connecting rod 30 and the second three-hole connecting rod 40 is rolling friction, reducing the friction at the hinge, which helps to suppress the noise at the hinge; at the same time, it helps the presser foot driver 60 to move stably and reliably; The second two-hole connecting rod 50 has the same structure as the first two-hole connecting rod 30, and also includes a third part and a fourth part. The third part and the fourth part are in the shape of a long strip. The second three-hole connecting rod 40 is arranged close to the presser foot driver 60, so that the fifth eyelet 42 is close to the presser foot driver 60. The third part and the fourth part are respectively located on both sides of the fifth eyelet 42 and the presser foot driver 60, and the fifth hinge shaft passes through the fifth eyelet 42, the third part, and the fourth part, so that the second three-hole connecting rod 40 is hinged to the second two-hole connecting rod 50; the sixth hinge shaft passes through the presser foot driver 60, the third part, and the fourth part, so that the second two-hole connecting rod 50 is hinged to the presser foot driver 60. In this way, the left and right sides of the second three-hole connecting rod 40 and the presser foot driver 60 are subjected to the action force, which helps to suppress the shaking of the second three-hole connecting rod 40 and the presser foot driver 60, so that the presser foot driver 60 can stably and reliably reciprocate in the vertical direction.

[0031] Of course, it is understandable that reference Figure 3 As shown, a bearing 80 is sleeved on the fifth hinge shaft, so that the hinge between the second three-hole connecting rod 40 and the second two-hole connecting rod 50 is rolling friction; a bearing 80 is sleeved on the sixth hinge shaft, so that the hinge between the second two-hole connecting rod 50 and the presser foot driver 60 is rolling friction.

[0032] The following Figure 4-Figure 7 , the working process of the presser foot driving device is explained, wherein the hinge center corresponding to the second eyelet 22 of the first three-hole connecting rod 20 is defined as A; the hinge center corresponding to the hinge position of the first three-hole connecting rod 20 and the first two-hole connecting rod 30 is defined as B; the hinge center corresponding to the hinge position of the first two-hole connecting rod 30 and the second three-hole connecting rod 40 is defined as C; the hinge center corresponding to the sixth eyelet 43 of the second three-hole connecting rod 40 is defined as D; the hinge center corresponding to the hinge position of the second three-hole connecting rod 40 and the second two-hole connecting rod 50 is defined as E; the hinge center corresponding to the hinge position of the second two-hole connecting rod 50 and the presser foot driver 60 is defined as F.

[0033] The first two-hole connecting rod 30 , the second two-hole connecting rod 50 , the first three-hole connecting rod 20 and the second three-hole connecting rod 40 are reciprocating swinging rods.

[0034] like Figure 4 As shown, at the current moment, the presser foot cam 10 is in its highest working position, and correspondingly, the presser foot driver 60 is in its lowest working position. Among them, the hinge center A, the hinge center B, and the hinge center C in the connecting rod mechanism are adjacent to each other, the hinge center B is located between the hinge center A and the hinge center C, and the angle between the connecting line between the hinge center A and the hinge center B and the connecting line between the hinge center C and the hinge center B is α, 170°≤α≤190°.

[0035] When the angle α gradually approaches 180° from 170°, the presser foot driver 60 stays at its lowest working position for a longer time, that is, the closer the angle α is to 180°, the longer the presser foot driver 60 stays at its lowest working position. When the angle α gradually approaches 190° from 180°, the presser foot driver 60 stays at its lowest working position for a gradually reduced time, that is, the closer the angle α is to 180°, the longer the presser foot driver 60 stays at its lowest working position.

[0036] like Figure 8 and Fig. 9 As shown, Figure 8 The motion curves of the presser foot driver and the needle bar in the related art are shown. Fig. 9 The motion curves of the presser foot driver and the needle bar of the present application are shown.

[0037] from Figure 8 It can be seen that due to the asynchronous movement of the presser foot driver and the needle bar, there is an impact force when the presser foot driver and the presser foot sleeve contact each other, which generates noise. Based on this, the present application adjusts the angle α to control the time the presser foot driver 60 stays at its lowest working position, that is, to adjust the angle α. Figure 8 The trough curve of the motion curve of the middle presser foot driver is adjusted to Fig. 9 In the corresponding area curve, it helps that the curve between the crest and the trough of the motion curve of the changed presser foot driver coincides with the curve between the crest and the trough of the motion curve of the needle bar, thereby helping the presser foot driver to move synchronously with the needle bar and minimize the instantaneous impact force of the contact between the presser foot driver and the presser foot sleeve to reduce noise.

[0038] like Figures 4 to 5 As shown, the presser foot cam 10 moves from its highest working position to its lowest working position, and correspondingly, the presser foot driver 60 moves from its lowest working position to its highest working position. Figure 5 As shown, at the current moment, the presser foot cam 10 is between its highest working position and its lowest working position.

[0039] like Figure 6 As shown, at the current moment, the presser foot cam 10 is in its lowest working position, and correspondingly, the presser foot driver 60 is in its highest working position. Among them, the hinge center D, the hinge center E, and the hinge center F in the connecting rod mechanism are adjacent to each other, the hinge center E is located between the hinge center D and the hinge center F, and the angle between the connecting line between the hinge center D and the hinge center E and the connecting line between the hinge center F and the hinge center E is β, 170°≤β≤190°.

[0040] When the angle β gradually approaches 180° from 170°, the presser foot driver 60 stays at its high and low working positions for a longer time, that is, the closer the angle α is to 180°, the longer the presser foot driver 60 stays at its highest working position. When the angle β gradually approaches 190° from 180°, the presser foot driver 60 stays at its highest working position for a gradually reduced time, that is, the closer the angle β is to 180°, the longer the presser foot driver 60 stays at its high and low working positions.

[0041] like Figure 8 and Fig. 9 As shown, Figure 8 The motion curves of the presser foot driver and the needle bar in the related art are shown. Fig. 9 The motion curves of the presser foot driver and the needle bar of the present application are shown.

[0042] from Figure 8 It can be seen that due to the asynchronous movement of the presser foot driver and the needle bar, there is an impact force when the presser foot driver and the presser foot sleeve contact each other, which generates noise. Based on this, the present application adjusts the angle β to control the time the presser foot driver 60 stays at its highest working position, that is, to adjust the angle β. Figure 8 The peak area curve of the motion curve of the middle presser foot driver is adjusted to Fig. 9 In the corresponding area curve, it helps that the curve between the crest and the trough of the motion curve of the changed presser foot driver coincides with the curve between the crest and the trough of the motion curve of the needle bar, thereby helping the presser foot driver to move synchronously with the needle bar and minimize the instantaneous impact force of the contact between the presser foot driver and the presser foot sleeve to reduce noise.

[0043] like Figure 6 to Figure 7 As shown, the presser foot cam 10 moves from its lowest working position to its highest working position, and correspondingly, the presser foot driver 60 moves from its highest working position to its lowest working position. Figure 7 As shown, at the current moment, the presser foot cam 10 is between its lowest working position and its highest working position.

[0044] In summary, the connecting rod mechanism of the present application includes multiple hinged positions. When the presser foot driver 60 is at the lowest position and the highest position, there are three adjacent first hinged positions, second hinged positions and third hinged positions among the multiple hinged positions. The connecting line of the hinge center (A or D) corresponding to the first hinged position and the hinge center (B or E) corresponding to the second hinged position, and the connecting line of the hinge center (C or F) corresponding to the third hinged position and the hinge center (B or E) corresponding to the second hinged position have an angle between 170° and 190°. By adjusting the size of the angle, it is helpful to synchronize the movement of the presser foot driver and the needle bar, and to reduce the instantaneous impact force of the presser foot driver and the presser foot sliding sleeve as much as possible to reduce noise. At the same time, the pause time of the presser foot pressing the cloth is guaranteed.

[0045] The present invention also provides a computer embroidery machine, which includes the above-mentioned presser foot driving device. The computer embroidery machine has the advantages of the above-mentioned presser foot driving device, so it is not repeated here.

[0046] It should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used above to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0047] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

Claims

1. A presser foot driving device, characterized in that: include: A presser foot cam assembly, the presser foot cam assembly comprising a presser foot cam (10); A presser foot driver (60); the presser foot driver (60) performs linear reciprocating motion; A connecting rod mechanism; the connecting rod mechanism comprises a plurality of connecting rods hinged in sequence, the connecting rod mechanism is located between the presser foot driver (60) and the presser foot cam (10), and connects the two so that the presser foot driver (60) performs linear reciprocating motion, The connecting rod mechanism comprises a plurality of hinged positions; when the presser foot driver (60) is in the lowest position and the highest position, there are three mutually adjacent first hinged positions, a second hinged position and a third hinged position among the plurality of hinged positions; an angle between a connecting line between a hinge center corresponding to the first hinged position and a hinge center corresponding to the second hinged position and a connecting line between a hinge center corresponding to the third hinged position and a hinge center corresponding to the second hinged position is between 170° and 190°.

2. The presser foot driving device according to claim 1, characterized in that: At least one of the connecting rod corresponding to the first hinge position, the connecting rod corresponding to the second hinge position, and the connecting rod corresponding to the third hinge position is a reciprocating swinging rod.

3. The presser foot driving device according to claim 2, characterized in that: The connecting rod mechanism comprises a first two-hole connecting rod (30), a second two-hole connecting rod (50), a first three-hole connecting rod (20) and a second three-hole connecting rod (40). The presser foot cam (10), the first three-hole connecting rod (20), the first two-hole connecting rod (30), the second three-hole connecting rod (40), and the second two-hole connecting rod (50) are connected in sequence, one hole of the first three-hole connecting rod (20) is used for hinged connection to the housing of the machine head, and one hole of the second three-hole connecting rod (40) is used for hinged connection to the housing of the machine head. The second two-hole connecting rod (50) is connected to the presser foot driver (60) so that the presser foot driver (60) performs linear reciprocating motion.

4. The presser foot driving device according to claim 3, characterized in that: When the presser foot driver (60) is in its lowest position, The hinge center (A) corresponding to a hole of the first three-hole connecting rod (20), the hinge center (B) corresponding to the hinge position of the first three-hole connecting rod (20) and the first two-hole connecting rod (30), and the hinge center (C) corresponding to the hinge position of the first two-hole connecting rod (30) and the second three-hole connecting rod (40) are adjacent to each other, and the connecting line between the hinge center (A) and the hinge center (B) and the connecting line between the hinge center (C) and the hinge center (B) form an angle α, and α is between 170° and 190°.

5. The presser foot driving device according to claim 3, characterized in that: When the presser foot driver (60) is in its highest position, The hinge center (D) corresponding to a hole of the second three-hole connecting rod (40), the hinge center (E) corresponding to the hinge position of the second three-hole connecting rod (40) and the second two-hole connecting rod (50), and the hinge center (F) corresponding to the hinge position of the second two-hole connecting rod (50) and the presser foot driver (60) are adjacent to each other, and the connecting line between the hinge center (D) and the hinge center (E) and the connecting line between the hinge center (F) and the hinge center (E) form an angle β, and β is between 170° and 190°.

6. The presser foot driving device according to any one of claims 2 to 5, characterized in that: The first two-hole connecting rod (30) comprises a first part (31) and a second part (32) which are independent of each other. One hole of the first three-hole connecting rod (20) and one hole of the second three-hole connecting rod (40) are located between the first part (31) and the second part (32).

7. The presser foot driving device according to claim 6, characterized in that: A hinge shaft sleeved with a bearing passes through a hole of the first three-hole connecting rod (20), the first part (31) and the second part (32), so that the first three-hole connecting rod (20) and the first two-hole connecting rod (30) are subjected to rolling friction; Another hinge shaft sleeved with a bearing passes through a hole of the second three-hole connecting rod (40), the first part (31) and the second part (32), so that the second three-hole connecting rod (40) and the first two-hole connecting rod (30) are subjected to rolling friction.

8. The presser foot driving device according to any one of claims 2 to 5, characterized in that: The second two-hole connecting rod (50) comprises a third part and a fourth part which are independent of each other. Another eyelet of the second three-hole connecting rod (40) and the presser foot driver (60) are at least partially located between the third portion and the fourth portion.

9. The presser foot driving device according to claim 8, characterized in that: A hinge shaft sleeved with a bearing passes through another eyelet of the second three-hole connecting rod (40), the third part and the fourth part, so that the second two-hole connecting rod (50) and the second three-hole connecting rod (40) are subjected to rolling friction; Another hinged shaft sleeved with a bearing passes through the presser foot driver (60), the third part and the fourth part, so that the presser foot driver (60) and the second two-hole connecting rod (50) are subjected to rolling friction.

10. A head of a computer embroidery machine, characterized in that: The presser foot driving device comprises a housing and any one of claims 1 to 9, The presser foot driving device is located in the housing, one hole of the first three-hole connecting rod (20) is hinged on the housing of the machine head, and one hole of the second three-hole connecting rod (40) is hinged on the housing of the machine head.

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