A presser foot drive device, a machine head, and a computerized embroidery machine

Abstract

This application discloses a presser foot drive device, a machine head, and a computerized embroidery machine. The presser foot drive moves from its lowest position to its highest position. When the presser foot drive approaches the center position between its lowest and highest positions, and is below this center position, the speed of the presser foot drive is at its maximum value. That is, when the presser foot drive is about to approach the center position between its lowest and highest positions, its speed has reached its maximum value. This helps to shorten the time for the presser foot drive to move from its lowest to its highest position, thereby improving the movement efficiency of the presser foot.

Description

Technical Field

[0001] This invention generally relates to the field of computerized embroidery machine technology, and specifically to a presser foot drive device, a machine head, and 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 faster the presser foot cam rotates, the less stable the aforementioned transmission mechanism becomes after prolonged high-speed operation. Summary of the Invention

[0004] This application aims to provide a presser foot drive device, a machine head, and a computerized embroidery machine, which at least enables the presser foot driver to reciprocate stably and reliably in the vertical direction, thereby driving the presser foot to reciprocate stably and reliably in the vertical direction, which is helpful for high-speed embroidery.

[0005] The present invention provides a presser foot driving device, comprising: a presser foot cam assembly, a presser foot driver, and a linkage mechanism.

[0006] The presser foot cam assembly includes a presser foot cam; the presser foot driver performs linear reciprocating motion; the linkage mechanism is located between the presser foot driver and the presser foot cam, and the linkage mechanism includes a first two-hole linkage, a second two-hole linkage, a third two-hole linkage, a fourth two-hole linkage, a fifth two-hole linkage, and a three-hole linkage.

[0007] The presser foot cam, the first two-hole connecting rod, the second two-hole connecting rod, the three-hole connecting rod, and the third two-hole connecting rod are connected in sequence. The fourth two-hole connecting rod and the first two-hole connecting rod are connected to the same position of the presser foot cam, and the fifth two-hole connecting rod and the second two-hole connecting rod are connected to the same position of the first two-hole connecting rod. The third two-hole connecting rod connects to the presser foot driver, so that the presser foot driver performs linear reciprocating motion.

[0008] As an implementation method, the fourth two-hole connecting rod and the first two-hole connecting rod are respectively disposed on both sides of the pressure foot cam, and the fifth two-hole connecting rod and the second two-hole connecting rod are respectively disposed on both sides of the first two-hole connecting rod.

[0009] As one possible implementation, one end of the fourth two-hole connecting rod is pinned, one end of the fifth two-hole connecting rod is pinned, and one hole of the three-hole connecting rod is pinned. The first plane passing through the pin connection axis of the fourth two-hole connecting rod is perpendicular to the connecting line between the pin connection center of the fourth two-hole connecting rod and the pin connection center of the three-hole connecting rod. The second plane passing through the pin connection axis of the three-hole connecting rod is perpendicular to the connecting line between the pin connection center of the fourth two-hole connecting rod and the pin connection center of the three-hole connecting rod. The pin connection center of the fifth two-hole connecting rod is located in the area between the first plane and the second plane.

[0010] As an implementation method, the angle between the line connecting the pin connection center of the fourth two-hole connecting rod and the pin connection center of the fifth two-hole connecting rod and the line connecting the pin connection center of the fifth two-hole connecting rod and the pin connection center of the three-hole connecting rod is θ, where 150°≤θ≤180°.

[0011] In one possible implementation, the presser foot driver moves from its lowest position to its highest position when the line connecting the rotation center and geometric center of the presser foot cam is perpendicular to the line connecting the hinge center of the presser foot cam and the geometric center of the first two-hole connecting rod. The angle between the first two-hole connecting rod and the fifth two-hole connecting rod is α, the angle between the fifth two-hole connecting rod and the second two-hole connecting rod is β, and the angle between the second two-hole connecting rod and the three-hole connecting rod is γ, where 60°≤γ, β, α≤110°.

[0012] As an implementation method, the length of the fifth two-hole connecting rod is less than the length of the fourth two-hole connecting rod.

[0013] As an alternative implementation, the fourth two-hole connecting rod is bent to avoid the pin connection position of the fifth two-hole connecting rod.

[0014] The present invention also provides a head for a computerized embroidery machine, including the presser foot drive device described above.

[0015] The present invention also provides a computerized embroidery machine, including the machine head of the computerized embroidery machine described above.

[0016] In the above-described scheme, both the left and right sides of the presser foot cam and the first two-hole connecting rod are subjected to force, which helps to suppress the vibration of the presser foot cam and the first two-hole connecting rod, thereby improving the stability of the presser foot driver's movement. Furthermore, the presser foot driver moves from its lowest position to its highest position. When the presser foot driver approaches the center position between its lowest and highest positions, and is below this center position, the speed of the presser foot driver is at its maximum value. That is, the presser foot driver is about to approach the center position between its lowest and highest positions when its speed is already at its maximum. This helps to shorten the time it takes for the presser foot driver to move from its lowest to its highest position, thereby improving the movement efficiency of the presser foot. Attached Figure Description

[0017] 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: Figure 1 A three-dimensional structural diagram of a machine head provided in an embodiment of the present invention; Figure 2 A front view schematic diagram of a machine head provided in an embodiment of the present invention. Figure 1 ; Figure 3 A front view schematic diagram of a machine head provided in an embodiment of the present invention. Figure 2 ; Figure 4 A 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 movement of the presser foot driving device provided in an embodiment of the present invention. Figure 2 ; Figure 6 for Figure 5 A magnified view of a portion of the image; Figure 7 A schematic diagram of the movement of the presser foot driving device provided in an embodiment of the present invention. Figure 3 ; Figure 8 A schematic diagram of the movement of the presser foot driving device provided in an embodiment of the present invention. Figure 4 ; Presser foot cam 10; Linkage mechanism 20, first two-hole link 21, second two-hole link 22, third two-hole link 23, three-hole link 24, fourth two-hole link 25, fifth two-hole link 26, pin connection center of fourth two-hole link 271, pin connection center of fifth two-hole link 272, pin connection center of three-hole link 273; Presser foot driver 30, presser foot 40, guide rod 50, needle bar 60. Detailed Implementation

[0018] 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 invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0019] 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.

[0020] A computerized embroidery machine includes a frame (not shown), several machine heads (not shown), and several shuttle boxes.

[0021] The frame includes a main beam (not shown) and a lower frame. Along the length of the main beam, several shuttle heads are arranged at equal intervals. Along the length of the lower frame, several shuttle boxes are arranged at equal intervals. Each shuttle box 40 corresponds to one of the shuttle heads and is located directly below the shuttle head.

[0022] The machine head includes a housing and a pressure foot drive device located inside the housing.

[0023] like Figure 1 and Figure 2 As shown, the presser foot drive device includes a presser foot cam assembly, a presser foot driver 30, a linkage mechanism 20, a presser foot 40, a needle bar 60, and a guide rod 50. Both the guide rod 50 and the needle bar 60 are arranged vertically. The presser foot driver 30 is sleeved on the guide rod 50 and performs linear reciprocating motion along the guide rod 50. The presser foot 40 is sleeved on the needle bar 60, and the presser foot driver 30 enables the presser foot 40 to perform linear reciprocating motion along the needle bar 60.

[0024] 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 20 is disposed between the presser foot cam 10 and the presser foot driver 30. The presser foot cam 10 causes the linkage mechanism 20 to move, and the linkage mechanism 20 causes the presser foot driver 30 to perform linear reciprocating motion along the guide rod 50.

[0025] The linkage mechanism 20 includes a first two-hole link 21, a second two-hole link 22, a third two-hole link 23, a fourth two-hole link 25, a fifth two-hole link 26, and a three-hole link 24. like Figure 1 As shown, the presser foot cam 10, the first two-hole connecting rod 21, the second two-hole connecting rod 22, the three-hole connecting rod 24, and the third two-hole connecting rod 23 are connected in sequence, with the third two-hole connecting rod 23 hinged to the presser foot driver 30. The fourth two-hole connecting rod 25 and the first two-hole connecting rod 21 are respectively located on the left and right sides of the presser foot cam 10, and are connected to the same position on the presser foot cam 10. The fifth two-hole connecting rod 26 and the second two-hole connecting rod 22 are respectively located on the left and right sides of the first two-hole connecting rod 21, and are connected to the same position on the first two-hole connecting rod 21. In this way, both the left and right sides of the presser foot cam 10 and the first two-hole connecting rod 21 are subjected to force, which helps to suppress the vibration of the presser foot cam 10 and the first two-hole connecting rod 21, thereby improving the stability of the presser foot driver 30's movement.

[0026] In addition, the other end of the fourth two-hole connecting rod 25 is pinned to the inner wall of the housing, the other end of the fifth two-hole connecting rod 26 is pinned to the inner wall of the housing, and one hole of the three-hole connecting rod 24 is pinned to the inner wall of the housing.

[0027] like Figure 2 As shown, the first plane D passing through the pin connection axis of the fourth two-hole connecting rod 25 is perpendicular to the connecting line between the pin connection center 271 of the fourth two-hole connecting rod 25 and the pin connection center 273 of the three-hole connecting rod 24. The second plane E passing through the pin connection axis of the three-hole connecting rod 24 is perpendicular to the connection line between the pin connection center 271 of the fourth two-hole connecting rod 25 and the pin connection center 273 of the three-hole connecting rod 24. The pin connection center 272 of the fifth two-hole connecting rod 26 is located in the area between the first plane D and the second plane E.

[0028] In a specific embodiment, such as Figure 3 As shown, the pin connection center 272 of the fifth two-hole connecting rod 26 is located in the region between the first plane D and the second plane E. The angle between the line connecting the pin connection centers 271 of the fourth two-hole connecting rod 25 and 272 of the fifth two-hole connecting rod 26 and the line connecting the pin connection center 272 of the fifth two-hole connecting rod 26 and 273 of the three-hole connecting rod 24 is θ, where 150°≤θ≤180°.

[0029] For example, the angle between the line connecting the pin connection center 271 of the fourth two-hole connecting rod 25 and the pin connection center 272 of the fifth two-hole connecting rod 26 and the line connecting the pin connection center 272 of the fifth two-hole connecting rod 26 and the pin connection center 273 of the three-hole connecting rod 24 is 165°.

[0030] In practical applications, there is a risk of interference between the pin corresponding to the pin center 272 of the fifth two-hole connecting rod 26 and the fourth two-hole connecting rod 25. Therefore, the fourth two-hole connecting rod 25 is set to be curved, or the length of the fifth two-hole connecting rod 26 is less than the length of the fourth two-hole connecting rod 25.

[0031] The following is passed Figures 4-8 The working process of the presser foot drive device is described below. The presser foot cam 10 has a rotation center A and a geometric center B. The rotation center A is a point on the rotation axis of the presser foot cam 10; the geometric center B is the center of symmetry of the circular cam part of the presser foot cam 10; and the hinge position between the presser foot cam 10 and the first two-hole connecting rod 21 is the hinge center C.

[0032] like Figure 4As shown, at the current moment, the presser foot cam 10 is in its highest working position, and the line connecting the rotation center A and the geometric center B, and the line connecting the hinge center C and the geometric center B, are on the same straight line. Correspondingly, the presser foot driver 30 is in its lowest working position. The presser foot driver 30 moves from its lowest working position to its highest working position.

[0033] like Figures 4 to 5 As shown, the pressure foot cam 10 moves from its highest working position to its lowest working position. Figure 5 As shown, at the current moment, the pressure foot cam 10 is between its highest and lowest working positions. The line connecting the rotation center A and the geometric center B is perpendicular to the line connecting the hinge center C and the geometric center B.

[0034] Correspondingly, such as Figure 6 As shown, the presser foot driver 30 moves from its lowest position to its highest position. When the line connecting the rotation center and geometric center of the presser foot cam 10 is perpendicular to the line connecting the hinge center C and geometric center B, the angle between the first two-hole connecting rod 21 and the fifth two-hole connecting rod 26 is α, the angle between the fifth two-hole connecting rod 26 and the second two-hole connecting rod 22 is β, and the angle between the second two-hole connecting rod 22 and the three-hole connecting rod 24 is γ, where 60°≤γ, β, α≤110°.

[0035] At the current moment, the presser foot driver 30 is near the center position between its lowest and highest positions, and is below this center position. The speed of the presser foot driver 30 is at its maximum value; that is, the presser foot driver 30 is about to approach the center position between its lowest and highest positions, and its speed is already at its maximum. This helps to shorten the time it takes for the presser foot driver 30 to move from its lowest to its highest position, thereby improving the movement efficiency of the presser foot 40.

[0036] like Figure 7 As shown, at the current moment, the presser foot cam 10 is in its lowest working position, and the line connecting the rotation center A and the geometric center B, and the line connecting the hinge center C and the geometric center B, are on the same straight line. Correspondingly, the presser foot driver 30 is in its highest working position. The presser foot driver 30 moves from its highest working position to its lowest working position.

[0037] like Figures 7 to 8 As shown, the pressure foot cam 10 moves from its lowest working position to its highest working position. Figure 8 As shown, at the current moment, the pressure foot cam 10 is between its lowest and highest working positions. The line connecting the rotation center A and the geometric center B is perpendicular to the line connecting the hinge center C and the geometric center B.

[0038] Correspondingly, the presser foot driver 30 moves from its highest position to its lowest position. At the current moment, the presser foot driver 30 is near the center position between its highest and lowest positions, and the presser foot driver 30 is above this center position.

[0039] The present invention also provides a head for a computerized embroidery machine, the head of which includes the aforementioned presser foot drive device. The head of the computerized embroidery machine has the advantages of the aforementioned presser foot drive device, where the left and right sides of the presser foot cam 10 and the first two-hole connecting rod 21 are subjected to force, which helps to suppress the vibration of the presser foot cam 10 and the first two-hole connecting rod 21, thereby helping to improve the stability of the presser foot driver 30's movement.

[0040] Furthermore, the presser foot driver 30 moves from its lowest position to its highest position. When the line connecting the rotation center and geometric center of the presser foot cam 10 is perpendicular to the line connecting the hinge center C and the geometric center B, the angle between the first two-hole link 21 and the fifth two-hole link 26 is α, the angle between the fifth two-hole link 26 and the second two-hole link 22 is β, and the angle between the second two-hole link 22 and the three-hole link 24 is γ, where 60°≤γ, β, α≤110°.

[0041] At the current moment, the presser foot driver 30 is near the center position between its lowest and highest positions, and is below this center position. The speed of the presser foot driver 30 is at its maximum value; that is, the presser foot driver 30 is about to approach the center position between its lowest and highest positions, and its speed is already at its maximum. This helps to shorten the time it takes for the presser foot driver 30 to move from its lowest to its highest position, thereby improving the movement efficiency of the presser foot 40.

[0042] The present invention also provides a computerized embroidery machine, including the aforementioned machine head. The computerized embroidery machine has the advantages of the aforementioned presser foot drive device, and therefore will not be described further.

[0043] It should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., 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 the invention 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 the invention. 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 the invention, unless otherwise stated, "a plurality of" means two or more.

[0044] 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 invention involved in this application is not limited to 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 (30); the presser foot driver (30) performs linear reciprocating motion; Linkage mechanism (20); The linkage mechanism (20) is located between the presser foot driver (30) and the presser foot cam (10), and the linkage mechanism (20) includes a first two-hole link (21), a second two-hole link (22), a third two-hole link (23), a fourth two-hole link (25), a fifth two-hole link (26), and a three-hole link (24). The presser foot cam (10), the first two-hole connecting rod (21), the second two-hole connecting rod (22), the three-hole connecting rod (24), and the third two-hole connecting rod (23) are connected in sequence. The fourth two-hole connecting rod (25) and the first two-hole connecting rod (21) are connected to the same position of the presser foot cam (10), and the fifth two-hole connecting rod (26) and the second two-hole connecting rod (22) are connected to the same position of the first two-hole connecting rod (21). The third two-hole connecting rod (23) is connected to the presser foot driver (30) so that the presser foot driver (30) performs linear reciprocating motion. Among them, one end of the fourth two-hole connecting rod (25) is pinned, one end of the fifth two-hole connecting rod (26) is pinned, and one end of the three-hole connecting rod (24) is pinned. The first plane (D) passing through the pin connection axis of the fourth two-hole connecting rod (25) is perpendicular to the connecting line between the pin connection center (271) of the fourth two-hole connecting rod (25) and the pin connection center (273) of the three-hole connecting rod (24); the second plane (E) passing through the pin connection axis of the three-hole connecting rod (24) is perpendicular to the connecting line between the pin connection center (271) of the fourth two-hole connecting rod (25) and the three-hole connecting rod (24). The connecting line between the pin connection centers (273) of the hole connecting rod (24) is perpendicular; the pin connection center (272) of the fifth two-hole connecting rod (26) is located in the area between the first plane (D) and the second plane (E); the connecting line between the pin connection center (271) of the fourth two-hole connecting rod (25) and the pin connection center (272) of the fifth two-hole connecting rod (26) and the connecting line between the pin connection center (272) of the fifth two-hole connecting rod (26) and the pin connection center (273) of the three-hole connecting rod (24) is θ, 150°≤θ≤180°.

2. The presser foot driving device according to claim 1, characterized in that, The fourth two-hole connecting rod (25) and the first two-hole connecting rod (21) are respectively disposed on both sides of the pressure foot cam (10). The fifth two-hole connecting rod (26) and the second two-hole connecting rod (22) are respectively disposed on both sides of the first two-hole connecting rod (21).

3. The presser foot driving device according to claim 1, characterized in that, The presser foot driver (30) moves from its lowest position to its highest position when the line connecting the rotation center (A) and geometric center (B) of the presser foot cam (10) is perpendicular to the line connecting the hinge center (C) and geometric center (B) of the presser foot cam (10) and the first two-hole connecting rod (21). The included angle between the first two-hole connecting rod (21) and the fifth two-hole connecting rod (26) is α, the included angle between the fifth two-hole connecting rod (26) and the second two-hole connecting rod (22) is β, and the included angle between the second two-hole connecting rod (22) and the three-hole connecting rod (24) is γ, 60°≤γ、β、α≤110°.

4. The presser foot driving device according to claim 1, characterized in that, The length of the fifth two-hole connecting rod (26) is less than the length of the fourth two-hole connecting rod (25).

5. The presser foot driving device according to claim 1, characterized in that, The fourth two-hole connecting rod (25) is bent to avoid the pin connection position of the fifth two-hole connecting rod (26).

6. A machine head for a computerized embroidery machine, characterized in that, The presser foot drive device includes any one of claims 1-5.

7. A computerized embroidery machine, characterized in that, Includes the head of the computerized embroidery machine as described in claim 6.

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