Presser foot driving device and machine head of computerized embroidery machine

Abstract

The utility model 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] This utility model generally relates to the field of computerized embroidery machine technology, and more particularly to a presser foot drive device and a machine head for a computerized embroidery machine. Background Technology

[0002] In the field of computerized embroidery machine technology, the machine head of a computerized embroidery machine includes a presser foot, a presser foot driver, a presser foot cam, and a transmission mechanism. The transmission mechanism is located between and connects the presser foot cam and the presser foot driver. The presser foot cam rotates, which in turn causes the presser foot driver to move, thereby driving the presser foot to move.

[0003] However, for high-speed embroidery machines, the aforementioned transmission mechanism is quite noisy. Utility Model Content

[0004] This application aims to provide a presser foot drive device and a machine head for a computerized embroidery machine, which at least synchronizes the movement of the presser foot driver with the needle bar, and minimizes the instantaneous impact force when the presser foot driver contacts the presser foot slide to reduce noise.

[0005] This utility model provides a presser foot driving device, including: a presser foot cam assembly, a presser foot driver and a linkage mechanism, wherein the presser foot cam assembly includes a presser foot cam.

[0006] The presser foot driver performs linear reciprocating motion; the linkage 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 linkage mechanism includes multiple hinge positions. When the presser foot driver is in the lowest and highest positions, there are three adjacent hinge positions: a first hinge position, a second hinge position, and a third hinge position. The angle between the line connecting the hinge center corresponding to the first hinge position and the hinge center corresponding to the second hinge position, and the angle between the line connecting the hinge center corresponding to the third hinge position and the hinge center corresponding to the second hinge position, is between 170° and 190°.

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

[0009] As one possible implementation, the linkage mechanism includes a first two-hole linkage, a second two-hole linkage, a first three-hole linkage, and a second three-hole linkage.

[0010] 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 hinge to the housing of the machine head. One hole of the second three-hole connecting rod is used to hinge to the housing of the machine head. The second two-hole connecting rod is connected to the presser foot driver so that the presser foot driver can perform linear reciprocating motion.

[0011] As an implementation method, when the presser foot driver is in its lowest position, the hinge center corresponding to the first 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 hinge center A and hinge center B and the connecting line between hinge center C and hinge center B form an angle α, where α is between 170° and 190°.

[0012] As an implementation method, when the presser foot driver is in its highest position, the hinge center corresponding to the first 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, where β is between 170° and 190°.

[0013] As one possible implementation, the first two-hole connecting rod includes a first part and a second part that are independent of each other, and one hole of the first three-hole connecting rod and one hole of the second three-hole connecting rod are located between the first part and the second part.

[0014] As an implementation method, a hinged shaft fitted with a bearing passes through a hole in 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 roll friction;

[0015] Another hinged shaft, fitted with a bearing, passes through a hole in the second three-hole connecting rod, the first part, and the second part, causing the second three-hole connecting rod to roll and rub against the first two-hole connecting rod.

[0016] As an implementation, the second two-hole connecting rod includes a third and a fourth independent portion, and the other hole of the second three-hole connecting rod is at least partially located between the third and the fourth portions and the presser foot driver.

[0017] As an implementation method, a hinged shaft fitted with a bearing passes through another hole 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 roll friction;

[0018] Another hinged shaft fitted with a bearing passes through the presser foot driver, the third part, and the fourth part, causing the presser foot driver to roll and rub against the second two-hole connecting rod.

[0019] This utility model also provides a machine head for a computerized embroidery machine, including a housing and the aforementioned presser foot drive device, wherein the presser foot drive device is located inside the housing. One hole of the first three-hole connecting rod is hinged to the housing of the machine head, and one hole of the second three-hole connecting rod is hinged to the housing of the machine head.

[0020] The linkage mechanism of this application includes multiple hinge positions. When the presser foot driver is in the lowest and highest positions, there are three adjacent hinge positions: a first hinge position, a second hinge position, and a third hinge position. The line connecting the hinge center (A or D) of the first hinge position and the hinge center (B or E) of the second hinge position forms an angle between the line connecting the hinge center (C or F) of the third hinge position and the hinge center (B or E) of the second hinge position and the line between them. This angle helps to synchronize the presser foot driver with the needle bar movement, minimizing the impact force at the moment of contact between the presser foot driver and the presser foot sleeve, thereby reducing noise. It also ensures the pause time for the presser foot to press the fabric. Attached Figure Description

[0021] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0022] Figure 1 A three-dimensional structural diagram of a machine head provided for an embodiment of this utility model;

[0023] Figure 2 An exploded view of the machine head provided for an embodiment of this utility model;

[0024] Figure 3 A partial explosion diagram of the machine head is provided for an embodiment of this utility model;

[0025] Figure 4 Schematic diagram of the movement of the presser foot drive device provided in the embodiment of this utility model Figure 1 ;

[0026] Figure 5 Schematic diagram of the movement of the presser foot drive device provided in the embodiment of this utility model Figure 2 ;

[0027] Figure 6 Schematic diagram of the movement of the presser foot drive device provided in the embodiment of this utility model Figure 3 ;

[0028] Figure 7 Schematic diagram of the movement of the presser foot drive device provided in the embodiment of this utility model Figure 4 ;

[0029] Figure 8 The motion curves of the presser foot driver and needle bar in related technologies are shown.

[0030] Figure 9 The motion curve diagram of the presser foot driver and the needle bar provided in the embodiment of this utility model;

[0031] Presser foot cam 10, first three-hole connecting rod 20, first hole 21, second hole 22, third hole 23;

[0032] First two-hole connecting rod 30, second three-hole connecting rod 40, fourth hole 41, fifth hole 42, sixth hole 43, second two-hole connecting rod 50, presser foot driver 60, guide rod 70, bearing 80. Detailed Implementation

[0033] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings.

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] A computerized embroidery machine consists of a frame, several machine heads, and several shuttle boxes.

[0036] The frame consists of a main beam and a lower frame. Along the length of the main beam, several machine heads are arranged at equal intervals. Along the length of the lower frame, several shuttle boxes are arranged at equal intervals. Each shuttle box corresponds to one of the machine heads and is located directly below the machine head.

[0037] The machine head includes a housing and a pressure foot drive device located inside the housing.

[0038] like Figure 1 and Figure 2 As shown, the presser foot drive device includes a presser foot cam assembly, a presser foot driver 60, a linkage mechanism, a presser foot, a needle bar, and a guide rod 70. Both the guide rod 70 and the needle bar are arranged vertically. The presser foot driver 60 is sleeved on the guide rod 70, and the presser foot driver 60 performs linear reciprocating motion along the guide rod 70. The presser foot is connected to the needle bar via a presser foot sleeve. With the cooperation of the presser foot driver 60 and the presser foot sleeve, the presser foot moves upwards or downwards.

[0039] The presser foot cam assembly includes a presser foot cam 10, which is sleeved on an upper shaft. The rotation of the upper shaft drives the presser foot cam 10 to rotate. A linkage mechanism is disposed between the presser foot cam 10 and the presser foot driver 60. The presser foot cam 10 causes the linkage mechanism to move, and the linkage mechanism causes the presser foot driver 60 to perform linear reciprocating motion along the guide rod 70.

[0040] The linkage mechanism includes a first two-hole link 30, a second two-hole link 50, a first three-hole link 20, and a second three-hole link 40, such as... 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.

[0041] The first three-hole connecting rod 20 includes a first hole 21, a second hole 22, and a third hole 23, which can be arranged in a triangular pattern. A first hinge shaft passes through the first hole 21 and can be connected to the housing via a bearing. The pressure foot cam 10 is hinged to the second hole 22.

[0042] The second three-hole connecting rod 40 has the same structure as the first three-hole connecting rod 20, and also includes a fourth hole 41, a fifth hole 42, and a sixth hole 43, which are arranged in a triangular pattern. The second hinge shaft passes through the sixth hole 43, and this second hinge shaft can be connected to the housing via a bearing.

[0043] The first two-hole connecting rod 30 includes a first part 31 and a second part 32, which are independent of each other and are in the shape of elongated plates. The second three-hole connecting rod 40 is positioned close to the first three-hole connecting rod 20, such that the fourth hole 41 is close to the third hole 23. The first part 31 and the second part 32 are located on both sides of the fourth hole 41 and the third hole 23, respectively. A third hinge shaft passes through the third hole 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; a fourth hinge shaft passes through the fourth hole 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. With this configuration, the first three-hole connecting rod 20 and the second three-hole connecting rod 40 are subjected to forces on both sides, which helps to suppress the vibration of the first three-hole connecting rod 20 and the second three-hole connecting rod 40, so that the pressure foot driver 60 can reciprocate stably and reliably in the vertical direction.

[0044] In addition, such as Figure 3As shown, a bearing 80 is sleeved on the third hinge shaft, so that the hinge joint between the first two-hole connecting rod 30 and the first three-hole connecting rod 20 is subject to rolling friction, reducing the frictional force at the hinge joint and helping to suppress noise at the hinge joint; 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 joint between the first two-hole connecting rod 30 and the second three-hole connecting rod 40 is subject to rolling friction, reducing the frictional force at the hinge joint and helping to suppress noise at the hinge joint; at the same time, it helps the presser foot driver 60 to move stably and reliably.

[0045] The second two-hole connecting rod 50 has the same structure as the first two-hole connecting rod 30, and also includes a third and a fourth part. The third and fourth parts are elongated plates. The second three-hole connecting rod 40 is positioned close to the presser foot actuator 60, so that the fifth hole 42 is close to the presser foot actuator 60. The third and fourth parts are located on both sides of the fifth hole 42 and the presser foot actuator 60, respectively. The fifth hinge shaft passes through the fifth hole 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 actuator 60, the third part, and the fourth part, so that the second two-hole connecting rod 50 is hinged to the presser foot actuator 60. With this arrangement, the second three-hole connecting rod 40 and the presser foot actuator 60 are subjected to forces on both sides, which helps to suppress the vibration of the second three-hole connecting rod 40 and the presser foot actuator 60, so that the presser foot actuator 60 can reciprocate stably and reliably in the vertical direction.

[0046] 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 joint between the second three-hole connecting rod 40 and the second two-hole connecting rod 50 is subject to rolling friction; a bearing 80 is sleeved on the sixth hinge shaft, so that the hinge joint between the second two-hole connecting rod 50 and the pressure foot driver 60 is subject to rolling friction.

[0047] The following is passed Figures 4-7 The working process of the presser foot drive device is described below. Specifically, the hinge center corresponding to the second hole 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 hole 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; and 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.

[0048] Among them, 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.

[0049] like Figure 4As 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. In the linkage mechanism, hinge centers A, B, and C are adjacent to each other, with hinge center B located between hinge centers A and C. The angle between the line connecting hinge centers A and B and the line connecting hinge centers C and B is α, where 170°≤α≤190°.

[0050] As the included angle α gradually approaches 180° from 170°, the dwell time of the presser foot actuator 60 in its lowest working position increases. In other words, the closer the included angle α is to 180°, the longer the presser foot actuator 60 remains in its lowest working position. As the included angle α gradually approaches 190° from 180°, the dwell time of the presser foot actuator 60 in its lowest working position gradually decreases. In other words, the closer the included angle α is to 180°, the longer the presser foot actuator 60 remains in its lowest working position.

[0051] like Figure 8 and Figure 9 As shown, Figure 8 The motion curves of the presser foot driver and needle bar in the related technology are shown. Figure 9 The motion curves of the presser foot driver and needle bar of this application are shown.

[0052] from Figure 8 It is known that the asynchronous movement of the presser foot driver and the needle bar causes an impact force and generates noise when the presser foot driver contacts the presser foot sleeve. Based on this, this application adjusts the included angle α to control the dwell time of the presser foot driver 60 in its lowest working position, that is, to... Figure 8 The trough region curve of the motion curve of the medium pressure foot driver is adjusted to Figure 9 The corresponding curves in the middle help the modified presser foot driver's motion curve, which is between the peaks and troughs, to coincide with the needle bar's motion curve, which is also between the peaks and troughs. This helps synchronize the presser foot driver and the needle bar's movement, minimizing the impact force at the moment of contact between the presser foot driver and the presser foot slide, thereby reducing noise.

[0053] 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 pressure foot cam 10 is between its highest working position and its lowest working position.

[0054] like Figure 6As 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. In the linkage mechanism, hinge centers D, E, and F are adjacent to each other, with hinge center E located between hinge centers D and F. The angle between the line connecting hinge centers D and E and the line connecting hinge centers F and E is β, where 170°≤β≤190°.

[0055] As the included angle β gradually approaches 180° from 170°, the dwell time of the presser foot actuator 60 in its high and low working positions increases. In other words, the closer the included angle α is to 180°, the longer the presser foot actuator 60 stays in its highest working position. As the included angle β gradually approaches 190° from 180°, the dwell time of the presser foot actuator 60 in its highest working position gradually decreases. In other words, the closer the included angle β is to 180°, the longer the presser foot actuator 60 stays in its high and low working positions.

[0056] like Figure 8 and Figure 9 As shown, Figure 8 The motion curves of the presser foot driver and needle bar in the related technology are shown. Figure 9 The motion curves of the presser foot driver and needle bar of this application are shown.

[0057] from Figure 8 It is known that the asynchronous movement of the presser foot driver and the needle bar causes an impact force and generates noise when the presser foot driver contacts the presser foot sleeve. Based on this, this application controls the dwell time of the presser foot driver 60 at its highest working position by adjusting the included angle β. Figure 8 The peak region curve of the motion curve of the medium pressure foot driver is adjusted to Figure 9 The corresponding curves in the middle help the modified presser foot driver's motion curve, which is between the peaks and troughs, to coincide with the needle bar's motion curve, which is also between the peaks and troughs. This helps synchronize the presser foot driver and the needle bar's movement, minimizing the impact force at the moment of contact between the presser foot driver and the presser foot slide, thereby reducing noise.

[0058] like Figures 6 to 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 pressure foot cam 10 is between its lowest working position and its highest working position.

[0059] In summary, the linkage mechanism of this application includes multiple hinge positions. When the presser foot driver 60 is in its lowest and highest positions, there are three adjacent hinge positions: a first hinge position, a second hinge position, and a third hinge position. The angle between the line connecting the hinge center (A or D) of the first hinge position and the hinge center (B or E) of the second hinge position, and the angle between the line connecting the hinge center (C or F) of the third hinge position and the hinge center (B or E) of the second hinge position, is between 170° and 190°. By adjusting this angle, it helps to synchronize the movement of the presser foot driver and the needle bar, minimizing the impact force at the moment of contact between the presser foot driver and the presser foot slide, thereby reducing noise. It also ensures the pause time for the presser foot to press the fabric.

[0060] This utility model also provides a computerized embroidery machine, which includes the aforementioned presser foot drive device. The computerized embroidery machine possesses the advantages of the aforementioned presser foot drive device, and therefore will not be described in detail further.

[0061] It should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used above to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0062] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A presser foot driving device, characterized in that, include: A presser foot cam assembly, the presser foot cam assembly including a presser foot cam (10). Presser foot driver (60); the presser foot driver (60) performs linear reciprocating motion; A linkage mechanism; the linkage mechanism includes a plurality of sequentially hinged links, the linkage mechanism being located between the presser foot driver (60) and the presser foot cam (10), and connecting the two, so that the presser foot driver (60) performs linear reciprocating motion. The linkage mechanism includes multiple hinge positions. When the presser foot driver (60) is in the lowest and highest positions, there are three adjacent hinge positions: a first hinge position, a second hinge position, and a third hinge position. The line connecting the hinge center corresponding to the first hinge position and the hinge center corresponding to the second hinge position is perpendicular to the line connecting the hinge center corresponding to the third hinge position and the hinge center corresponding to the second hinge position. The angle between the two lines is between 170° and 190°.

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

3. The presser foot driving device according to claim 2, characterized in that, The linkage mechanism includes a first two-hole linkage (30), a second two-hole linkage (50), a first three-hole linkage (20), and a second three-hole linkage (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 to the housing of the machine head, and one hole of the second three-hole connecting rod (40) is used for hinged 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 the first 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. 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, where 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 the first 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. 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, where β is between 170° and 190°.

6. The presser foot driving device according to any one of claims 2-5, characterized in that, The first two-hole connecting rod (30) includes a first part (31) and a second part (32) that 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 fitted with a bearing passes through a hole in the first three-hole connecting rod (20), the first part (31) and the second part (32), causing the first three-hole connecting rod (20) to roll and rub against the first two-hole connecting rod (30); Another hinge shaft fitted with a bearing passes through a hole in the second three-hole connecting rod (40), the first part (31) and the second part (32), causing the second three-hole connecting rod (40) to roll and rub against the first two-hole connecting rod (30).

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

9. The presser foot driving device according to claim 8, characterized in that, A hinged shaft fitted with a bearing passes through another hole of the second three-hole connecting rod (40), the third part and the fourth part, causing the second two-hole connecting rod (50) to roll and rub against the second three-hole connecting rod (40); Another hinged shaft fitted with a bearing passes through the presser foot driver (60), the third part, and the fourth part, causing the presser foot driver (60) to roll and rub against the second two-hole connecting rod (50).

10. A machine head for a computerized embroidery machine, characterized in that, Includes a housing and the presser foot drive device according to any one of claims 1-9, The presser foot drive device is located inside the housing. One hole of the first three-hole connecting rod (20) is hinged to the housing of the machine head, and one hole of the second three-hole connecting rod (40) is hinged to the housing of the machine head.

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