Driving device for presser foot and needle bar

Abstract

The utility model provides a driving device for a presser foot and a needle bar, which comprises a driving shaft and a guide bar, a presser foot eccentric cam and a needle bar eccentric cam are arranged on the driving shaft, a driving bar is arranged outside the presser foot eccentric cam, and a needle bar eccentric cam is arranged outside the needle bar eccentric cam. A first transmission assembly and a second transmission assembly which are used for driving the presser foot driving block to move up and down along the guide rod are arranged between the driving rod and the presser foot driving block, the first transmission assembly is provided with a first rotating fulcrum, and the second transmission assembly is provided with a second rotating fulcrum; and an adjusting structure which is detachable or can adjust the angle to enable the presser foot to complete the required action is arranged between the first transmission component and the second transmission component. The device can be adjusted according to actual requirements, and the presser foot is accurately driven to complete corresponding actions according to embroidery requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of embroidery machines, in particular to a driving device for a presser foot and a needle bar. Background Art

[0002] In order to save space, existing embroidery machines usually use the same drive shaft to drive the presser foot and the needle bar. The drive shaft is provided with two eccentric cams or eccentric cam grooves, which cooperate with the connecting rod to drive the presser foot and the needle bar respectively. The eccentric cam groove rotates at high speed, and is subjected to large forces, which are easy to burst and damage. When the eccentric cam rotates, the swing amplitude of the driving connecting rod is small. Usually, a transmission component is set to drive the presser foot driving frame to slide up and down. The transmission components are fixed or rotatably connected, and driven by the transmission between the transmission rods. The position of the presser foot driving frame is not accurate enough.

[0003] If an eccentric cam is set, the presser foot driving cam and the needle bar driving cam are usually not symmetrically set, that is, the farthest points of the presser foot driving cam and the needle bar driving cam from the center of the driving shaft are not in a straight line. At this time, the two cams generate inertial force when they rotate, which makes the force on the driving shaft unbalanced, increases the load on the driving shaft, that is, increases the load on the driving motor, and shortens the service life of the driving shaft. Summary of the invention

[0004] In order to solve the above problems of the prior art, the utility model provides a driving device for a presser foot and a needle bar, and the driving mechanism can be adjusted as needed to more accurately drive the presser foot driving frame to complete corresponding actions as required.

[0005] The technical solutions adopted are as follows:

[0006] A driving device for a presser foot and a needle bar comprises a driving shaft and a guide rod. The driving shaft is provided with a presser foot eccentric cam and a needle bar eccentric cam, the presser foot eccentric cam is provided with a driving rod outside, a first transmission assembly and a second transmission assembly are provided between the driving rod and the presser foot driving block for driving the presser foot driving block to move up and down along the guide rod, the first transmission assembly has a first rotating fulcrum, the second transmission assembly has a second rotating fulcrum, and a detachable or angle-adjustable adjustment structure is provided between the first and second transmission assemblies so that the presser foot can complete the required action.

[0007] Furthermore, the first transmission assembly includes a first bent rod arranged on a first rotating fulcrum, one end of the first bent rod is arranged on the driving rod, and the other end is provided with a first connecting rod.

[0008] Furthermore, the second transmission assembly includes a second bent rod arranged on a second rotating fulcrum, one end of the second bent rod is connected to the first connecting rod, and the other end is provided with a second connecting rod, and the second connecting rod is connected to the presser foot driving block.

[0009] Furthermore, the adjustment structure is arranged between the first connecting rod and the second bending rod.

[0010] Furthermore, a transmission pin is provided at one end of the first connecting rod that cooperates with the second bent rod, and the adjustment structure includes a clamping ring provided at one end of the second bent rod that cooperates with the first connecting rod and provided on the transmission pin, and an adjustment bolt provided on the clamping ring.

[0011] Furthermore, the three points of the presser foot eccentric cam, the presser foot cam's farthest point from the drive shaft axis, the needle bar eccentric cam, the needle bar cam's farthest point from the drive shaft axis, and the drive shaft axis are on the same straight line, and the farthest point of the presser foot cam and the needle bar cam's farthest point are respectively located on both sides of the drive shaft axis.

[0012] Furthermore, the first rotation fulcrum and the second rotation fulcrum are both arranged on the machine head.

[0013] Compared with the prior art, the beneficial effects produced by the utility model are:

[0014] The utility model provides a driving device for a presser foot and a needle bar, comprising a presser foot eccentric cam and a needle bar eccentric cam arranged on a driving shaft, a driving rod being arranged on the presser foot eccentric cam, a presser foot driving block being driven to move up and down by a first transmission assembly and a second transmission assembly, the first transmission assembly and the second transmission assembly being both provided with corresponding rotating fulcrums, an adjusting structure for adjusting an angle being arranged between the first and the second transmission assemblies, which can be adjusted according to actual needs, and the presser foot can be accurately driven to complete corresponding actions according to the requirements of embroidery.

[0015] The presser foot eccentric cam and the needle bar eccentric cam are symmetrically arranged, so that the force on the drive shaft is relatively uniform, and it is not easy to produce errors during rotation, which reduces the load on the drive shaft and prolongs the service life of the drive shaft. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] Figure 2 It is a side view of the utility model;

[0018] Figure 3 It is a structural schematic diagram of a presser foot driving structure of the utility model at one angle;

[0019] Figure 4 This is a structural schematic diagram of the presser foot driving structure of the utility model from another angle;

[0020] Figure 5 The diagram is a positional relationship diagram of the presser foot eccentric cam and the needle bar eccentric cam;

[0021] Among them, the drive shaft 1, the presser foot eccentric cam 2, the farthest point 201 of the presser foot cam, the drive rod 3, the guide rod 4, the presser foot drive block 5, the first transmission assembly 6, the first curved rod 601, the first connecting rod 602, the second transmission assembly 7, the second curved rod 701, the second connecting rod 702, the first rotation fulcrum 8, the second rotation fulcrum 9, the adjustment structure 10, the clamping ring 1001, the adjustment bolt 1002, the transmission pin 11, the needle bar eccentric cam 12, the farthest point 1201 of the needle bar cam, and the machine head 13. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with specific embodiments.

[0023] refer to Figure 1-5 A presser foot and needle bar driving device comprises a driving shaft 1 and a guide rod 4, wherein a presser foot eccentric cam 2 and a needle bar eccentric cam 12 are arranged on the driving shaft 1, a driving rod 3 is arranged outside the presser foot eccentric cam 2, a first transmission assembly 6 and a second transmission assembly 7 for driving the presser foot driving block 5 to move up and down along the guide rod 4 are arranged between the driving rod 3 and the presser foot driving block 5, the first transmission assembly 6 has a first rotating fulcrum 8, the second transmission assembly 7 has a second rotating fulcrum 9, and an adjusting structure 10 which can be disassembled or adjusted in angle so that the presser foot can complete the required action is arranged between the first and second transmission assemblies.

[0024] The first rotation fulcrum 8 and the second rotation fulcrum 9 are both arranged on the machine head 13. The first transmission assembly 6 includes a first curved rod 601 arranged on the first rotation fulcrum 8, one end of the first curved rod 601 is arranged on the driving rod 3, and the other end is provided with a first connecting rod 602. The second transmission assembly 7 includes a second curved rod 701 arranged on the second rotation fulcrum 9, one end of the second curved rod 701 is connected to the first connecting rod 602, and the other end is provided with a second connecting rod 702, and the second connecting rod 702 is connected to the presser foot driving block 5.

[0025] by Figure 2 As a reference, the driving shaft 1 rotates clockwise to drive the presser foot eccentric cam 2 to rotate clockwise, and the driving rod 3 swings in the clockwise direction, driving the first curved rod 601 to swing in the clockwise direction, and the first connecting rod 602 will move in the direction away from the guide rod 4. Since the first connecting rod 602 is connected to the second curved rod 701, when the first connecting rod 602 moves in the direction away from the guide rod 4, the second curved rod 701 rotates counterclockwise around the second rotation fulcrum 9, driving the second connecting rod 702 to rotate counterclockwise, and the second connecting rod 702 is connected to the presser foot driving block 5, which will drive the presser foot driving block 5 to move upward. Similarly, when the driving shaft 1 rotates counterclockwise, the presser foot driving block 5 will move downward after being driven by the first and second transmission components.

[0026] The end of the first connecting rod 602 that matches the second curved rod is provided with a transmission pin 11, and the adjustment structure 10 is provided between the first connecting rod 602 and the second curved rod 701. The adjustment structure 10 includes a clamping ring 1001 provided at one end of the second curved rod that matches the first connecting rod and is provided on the transmission pin 11, and an adjustment bolt 1002 provided on the clamping ring 1001. The adjustment bolt 1002 can adjust the tightness of the clamping ring 1001, and can adjust the angle between the first connecting rod 602 and the first curved rod 701 as needed, and accurately drive the presser foot driving block 5 to complete the corresponding action according to the requirements of embroidery.

[0027] Compared with the prior art in which an eccentric cam groove is provided to drive the presser foot and the needle bar to move up and down, the eccentric cam drive is more stable, less prone to damage, and has a longer service life.

[0028] The three points of the presser foot eccentric cam 2, the presser foot cam farthest point 201 from the axis of the drive shaft 1, the needle bar cam farthest point 1201 from the axis of the drive shaft 1 and the axis of the drive shaft 1 are on the same straight line, and the presser foot cam farthest point 201 and the needle bar cam farthest point 1201 are respectively located on both sides of the axis of the drive shaft 1. The presser foot eccentric cam 2 and the needle bar eccentric cam 12 are symmetrically arranged, the force on the drive shaft 1 is more uniform, and it is not easily affected by the inertia force, which reduces the load on the drive shaft 1 and prolongs the service life of the drive shaft 1.

[0029] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A presser foot and needle bar driving device, comprising a driving shaft (1) and a guide rod (4), wherein the driving shaft (1) is provided with a presser foot eccentric cam (2) and a needle bar eccentric cam (12), characterized in that: The presser foot eccentric cam (2) is provided with a driving rod (3) outside, and a first transmission assembly (6) and a second transmission assembly (7) are provided between the driving rod (3) and the presser foot driving block (5) for driving the presser foot driving block (5) to move up and down along the guide rod (4). The first transmission assembly (6) has a first rotation fulcrum (8), and the second transmission assembly (7) has a second rotation fulcrum (9). An adjustment structure (10) is provided between the first and second transmission assemblies, which can be disassembled or adjusted in angle so that the presser foot can complete a desired action.

2. The driving device for the presser foot and the needle bar according to claim 1, characterized in that: The first transmission assembly (6) comprises a first bent rod (601) arranged on a first rotation fulcrum (8); one end of the first bent rod (601) is arranged on the driving rod (3), and the other end is provided with a first connecting rod (602).

3. The driving device for the presser foot and the needle bar according to claim 2, characterized in that: The second transmission assembly (7) comprises a second curved rod (701) arranged on the second rotation fulcrum (9), one end of the second curved rod (701) is connected to the first connecting rod (602), and the other end is provided with a second connecting rod (702), and the second connecting rod (702) is connected to the presser foot driving block (5).

4. The driving device for the presser foot and the needle bar as claimed in claim 3, characterized in that: The adjustment structure (10) is arranged between the first connecting rod (602) and the second curved rod (701).

5. The driving device for the presser foot and the needle bar according to claim 3, characterized in that: A transmission pin (11) is provided at one end of the first connecting rod (602) that cooperates with the second bent rod, and the adjustment structure (10) comprises a clamping ring (1001) provided at one end of the second bent rod that cooperates with the first connecting rod and provided on the transmission pin (11), and an adjustment bolt (1002) provided on the clamping ring (1001).

6. The driving device for the presser foot and the needle bar according to claim 1, characterized in that: The farthest point (201) of the presser foot eccentric cam (2) from the axis of the drive shaft (1), the farthest point (1201) of the needle bar eccentric cam (12) from the axis of the drive shaft (1), and the axis of the drive shaft (1) are located on the same straight line, and the farthest point (201) of the presser foot cam and the farthest point (1201) of the needle bar cam are located on both sides of the axis of the drive shaft (1), respectively.

7. The driving device for the presser foot and the needle bar according to claim 1, characterized in that: The first rotation fulcrum (8) and the second rotation fulcrum (9) are both arranged on the machine head (13).

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