Machine head and embroidery machine

Abstract

The utility model discloses a machine head and an embroidery machine, a presser foot driver which is matched with a presser foot transmission component and receives power transmitted by the presser foot transmission component is arranged on a guide rod, and the presser foot driver is provided with a presser foot driving structure which drives a presser foot to move up and down along with the presser foot driver. The presser foot driver drives the presser foot to act, a presser foot spring for driving the presser foot to work between the needle bar and the presser foot can be completely omitted, after the presser foot touches the bottom, the needle bar relatively independent of the presser foot driver operates independently, corresponding embroidery actions are completed freely, extra compression of the presser foot spring by the needle bar is omitted, and continuous compression of the presser foot spring by the needle bar is avoided. According to the utility model, invalid energy for continuously compressing the presser foot spring is effectively saved, the pressure generated when the transmission shaft drives the needle bar and the presser foot to move downwards is relieved, and the driving output force of the transmission shaft and the motor is relatively balanced when the needle bar and the presser foot move downwards and then return after moving downwards to a low point. And the operation of the whole machine head is relatively balanced. And vibration and noise of the machine head and the machine body are reduced.

Description

Technical Field

[0001] The utility model relates to a machine head and an embroidery machine. Background Art

[0002] On the needle bar of the existing widely used embroidery machine head, there is usually a presser foot spring for driving the presser foot to move downward, and on the machine head, there is also a lifting driver for lifting the presser foot upward through a presser foot cam. When the embroidery machine is working, the needle bar driving cam drives the needle bar to reciprocate up and down through a needle bar transmission assembly and a needle bar driver.

[0003] When the needle bar moves downward, the downward moving needle bar drives the presser foot to move downward through the presser foot spring to press the cloth. When the needle bar moves upward, the presser foot driving cam lifts the presser foot upward through a presser foot transmission assembly and the upward moving lifting driver. The running strokes of the needle bar and the presser foot are not completely consistent, and the stroke of the needle bar is much larger than that of the presser foot. When the needle bar drives the presser foot to move downward through the presser foot spring, after the presser foot touches the bottom, the needle bar still needs to continue to move downward. The continuously downward moving needle bar will continuously and additionally squeeze the presser foot spring. As the spring continues to be compressed until the needle bar moves downward to the lowest point, the rebound force of the spring also reaches the maximum. At this time, the driving motor and the corresponding main shaft of the embroidery machine need to bear the maximum load. Usually, the driving force of each machine head needle bar on the presser foot spring can reach up to 1200 gf (gram-force) at most, and finally it will all become the load on the main shaft. When the number of machine heads is large, this additional driving force will greatly increase the load on the main shaft, restricting the increase in the number of machine heads or restricting the transmission accuracy of the main shaft.

[0004] In addition, when the motor drives the main shaft to drive the needle bar to move from the highest point to the lowest point, it is necessary to overcome the reaction force of the presser foot spring, and the load of the motor and the main shaft is continuously increasing. When the needle bar moves from the lowest point to the highest point, the load of the motor and the main shaft decreases instantaneously. In this way, within a cycle of the rotation of the main shaft, an extremely unbalanced load of the motor and the main shaft, and a relative imbalance in the operation of the machine head needle bar and the presser foot are formed, which is one of the main sources of vibration and noise of the embroidery machine and will affect the stable operation and service life of the embroidery machine in the long run. Summary of the Utility Model

[0005] In order to solve the problems existing in the prior art during use, the utility model provides a machine head and an embroidery machine with reasonable combination, which can effectively reduce the load of the embroidery machine and increase the balance of the motor, transmission shaft and machine head during the operation of the embroidery machine.

[0006] The technical solution of the present utility model to solve the existing problems is: A machine head, including a machine head housing, a needle bar, a presser foot, a transmission shaft, a needle bar driver, a needle bar jumping structure, a needle bar driving cam and a presser foot driving cam. The needle bar driving cam and the presser foot driving cam are arranged on the transmission shaft. It further includes a needle bar transmission assembly for transmitting the power of the needle bar driving cam to the needle bar driver, and a presser foot transmission assembly for transmitting the power of the presser foot driving cam. As an improvement, it further includes a presser foot driver arranged on a guide rod, cooperating with the presser foot transmission assembly and receiving the power transmitted by the presser foot transmission assembly, and capable of jumping. The presser foot driver is provided with a presser foot driving structure for driving the presser foot to move up and down along with the presser foot driver, and the presser foot driver is provided with a presser foot jumping structure for driving the presser foot driver to jump. The guide rod is installed at the corresponding position of the machine head housing.

[0007] As a further improvement, the guide rod is a needle bar guide rod installed with a needle bar driver, and the presser foot driver is arranged below the needle bar driver.

[0008] As a further improvement, the guide rod is a presser foot guide rod, and the presser foot guide rod is arranged non-coaxially with the needle bar guide rod installed with the needle bar driver.

[0009] As a further improvement, the presser foot driving structure includes a card slot arranged on the presser foot driver and cooperating with the corresponding position of the presser foot at the working station.

[0010] As a further improvement, the presser foot jumping structure includes an independent second jumping driving motor, a second swing arm arranged on the shaft of the second jumping driving motor, and a transmission assembly connecting the second swing arm to drive the presser foot driver to deflect and jump.

[0011] As a further improvement, the needle bar jumping structure includes a jumping driving motor, and a first swing arm arranged on the shaft of the jumping driving motor for driving the needle bar driver to deflect and jump; the presser foot jumping structure includes a second swing arm for driving the presser foot driver to deflect and jump, and a second transmission connecting rod is arranged between the first and second swing arms for transmitting the power of the first swing arm to the second swing arm.

[0012] As a further improvement, the first swing arm is provided with a first transmission assembly for driving the needle bar driver to deflect and jump; the second swing arm is provided with a second transmission assembly for driving the needle bar driver to deflect and jump.

[0013] As a further improvement, the presser foot is sleeved on the needle bar; and / or the presser foot is sleeved on a guide rod arranged non-coaxially with the needle bar.

[0014] As a further improvement, the presser foot driver includes a sliding block sliding on a guide rod, and a rotatable and resetable rotating block provided on the sliding block. The rotating block is provided with a card slot that cooperates with a driving projection provided on the presser foot. The card slot is provided with a guiding inclined surface on the upper side for guiding the driving projection provided on the presser foot to deflect into the card slot through the presser foot driver. The card slot constitutes a presser foot driving structure.

[0015] As a further improvement, the second transmission assembly includes a protruding rod provided on the second swing arm. A pressing wheel is provided on the protruding rod, and a transmission track cooperating with the pressing wheel is provided on the presser foot driver.

[0016] As a further improvement, the presser foot driver includes a sliding block sliding on a guide rod, and a rotatable and resetable rotating block provided on the sliding block. A buffer spring for buffering the impact of the presser foot is provided between the rotating block and the sliding block.

[0017] The present utility model also discloses an embroidery machine. A machine head assembled with any one or a combination of any multiple of the above solutions is installed on the embroidery machine. The embroidery machine includes a machine body, and at least one of the above machine heads is provided on the machine body.

[0018] Compared with the prior art, the present utility model provides a presser foot driver that is arranged on a guide rod, cooperates with a presser foot transmission assembly, receives the power transmitted by the presser foot transmission assembly, and can achieve jumping. The presser foot driver is provided with a presser foot driving structure for driving the presser foot to move up and down along with the presser foot driver. Through the cooperation of the presser foot driving cam and the presser foot transmission assembly, power is transmitted to the presser foot driver, causing the presser foot driver to slide along the guide rod, driving the presser foot to perform corresponding actions, and enabling the presser foot to cooperate with the needle bar to complete embroidery during the embroidery process. And the presser foot driver is provided with a presser foot jumping structure for driving the presser foot driver to achieve jumping, so as to meet the requirements of replacing the needle bar and corresponding embroidery processes during the color-changing process, realize the need for jumping, and enable the embroidery machine to work normally.

[0019] The present utility model drives the presser foot to act through the presser foot driver, completely replacing the existing structure of driving the presser foot by the needle bar and the presser foot spring. The beneficial effect is that the structure of the present utility model can completely eliminate the presser foot spring for driving the presser foot between the needle bar and the presser foot. The presser foot driver drives the presser foot to operate independently. After the presser foot touches the bottom, the needle bar, which is relatively independent of the presser foot drive, drives the needle bar to operate independently through the needle bar driving cam and the needle bar transmission assembly, freely completing its corresponding embroidery actions, eliminating the additional compression of the presser foot spring by the needle bar. At the same time, when the presser foot touches the bottom, the continuous compression of the presser foot spring by the needle bar is avoided. Effectively saving the ineffective energy expended in continuously compressing the presser foot spring, reducing the pressure on the transmission shaft when driving the needle bar and the presser foot to move downward. Relatively, when the transmission shaft and the machine body drive motor drive the needle bar and the presser foot to move downward and then return after reaching the low point, the driving output force is more balanced. The entire machine head can operate more smoothly, reducing the vibration and noise of the machine head and the machine body. Brief Description of the Drawings

[0020] Figure 1 is a schematic structural view of the head of the present utility model.

[0021] Figure 2 is a side view of the head drive of the present utility model.

[0022] Figure 3 is a schematic structural view of the drive part of the head of the present utility model.

[0023] Figure 4 is Figure 3 an enlarged schematic view of the a position of

[0024] Figure 5 is a side view of the drive part of the head of the present utility model.

[0025] Figure 6 is an enlarged schematic view of the structure of the presser foot drive of the head of the present utility model.

[0026] Figure 7 is a side view of the presser foot drive of the mechanism of the present utility model.

[0027] Figure 8 is Figure 7 an enlarged schematic view of the b position of Detailed Embodiment

[0028] Head housing 1, needle bar holder 2, needle bar driver 21, needle bar transmission assembly 22, needle bar guide rod 23, transmission shaft 3, presser foot transmission assembly 4, large connecting rod 41, lifting and pressing auxiliary connecting rod 42, first small connecting rod 43, second small connecting rod 44, presser foot driver 5, presser foot 51, driving convex block 52, sliding block 53, rotating block 54, card slot 55, guiding inclined plane 56, transmission track 57, presser foot jumping structure 6, second swing arm 61, second transmission assembly 62, extending rod 63, pressing wheel 64, jumping driving motor 7, first swing arm 71, first transmission assembly 72, second transmission connecting rod 8, main shaft 9.

[0029] Refer to Figures 1-8, in this embodiment, a machine head includes a machine head housing 1, a needle bar, a presser foot 51, a transmission shaft 3 for driving the needle bar and the presser foot to move, a needle bar driver 21, a needle bar jumping structure for driving the needle bar driver 21 to achieve a jumping motion, a needle bar driving cam disposed on the transmission shaft 3, and a presser foot driving cam disposed on the transmission shaft 3. The needle bar and the presser foot can be directly or through a frame body disposed at corresponding positions of the machine head as needed. In this embodiment, in order to be applicable to most existing machine heads, a needle bar frame 2 is usually provided, and the needle bar and the presser foot are disposed on the needle bar frame 2. The needle bar and the presser foot can completely adopt the existing technical structure cooperation, but there is no need to provide a presser foot spring between the presser foot and the needle bar. As described, the presser foot can be sleeved on the needle bar; or / and the presser foot is sleeved on a guide rod that is not coaxially disposed with the needle bar. The transmission shaft 3 can be a main shaft disposed on the machine body and directly connected to the needle bar driving cam and the presser foot driving cam on each machine head; or it can be disposed on each machine head and connected to the main shaft on the machine body that transmits the power of the driving motor to supply power to each machine head. In this embodiment, preferably, the transmission shaft 3 is disposed on the machine head housing and cooperates with the main shaft 9 disposed on the machine body through a gear assembly, a synchronous belt pulley assembly, etc. The main shaft 9 drives the transmission shaft 3, and the transmission shaft 3 drives the needle bar driving cam and the presser foot driving cam mounted on the transmission shaft 3 to rotate.

[0030] It further includes a presser foot driver 5 disposed on the guide rod, cooperating with the presser foot transmission assembly 4 and receiving the power transmitted by the presser foot transmission assembly 4, and capable of achieving a jump. The guide rod can be mounted at a corresponding position of the machine head housing 1, and the specific structure and position can be set according to the existing technical structure for the purpose of guiding the presser foot driver 5. The presser foot driver 5 is provided with a presser foot driving structure for driving the presser foot to move up and down with the presser foot driver 5, and the presser foot driver 5 is provided with a presser foot jumping structure 6 for driving the presser foot driver 5 to achieve a jump.

[0031] Inside the machine head housing 1, there is usually a needle bar transmission assembly 22 for transmitting the power of the needle bar driving cam to the needle bar driver 21, and a presser foot transmission assembly 4 for transmitting the presser foot driving cam. The needle bar transmission assembly 22 and the presser foot transmission assembly 4 can adopt the existing connecting rod group transmission structure as needed.

[0032] Specifically in this embodiment, such as Figures 3-8, the presser foot transmission assembly 4 includes a large connecting rod 41 with a fulcrum, a lifting and pressing auxiliary connecting rod 42 with a fulcrum, and a first small connecting rod 43 connecting the large connecting rod 41 and the lifting and pressing auxiliary connecting rod 42. A second small connecting rod 44 for driving the presser foot driver to reciprocally slide along the guide rod is provided between the lifting and pressing auxiliary connecting rod 42 and the presser foot driver 5. The presser foot driving cam cooperates with the large connecting rod 41 to drive the large connecting rod 41 to reciprocally rotate around the fulcrum. The reciprocating large connecting rod drives the lifting and pressing auxiliary connecting rod 42 to reciprocate through the first small connecting rod 43. The reciprocating lifting and pressing auxiliary connecting rod 42 drives the second small connecting rod 44 to cause the presser foot driver 5 to reciprocally slide on the guide rod (such as the needle bar guide rod 23). The fulcrums of the large connecting rod 41 and the lifting and pressing auxiliary connecting rod 42 can be set on the head shell as needed. The settings of the connecting rods of the presser foot transmission assembly 4 are based on the ability to meet the requirements for driving the presser foot driver 5 to perform embroidery work.

[0033] During use, the presser foot driving cam can drive the presser foot transmission assembly 4 to act, and the presser foot transmission assembly 4 can drive the presser foot driver 5 to realize the action of the presser foot during embroidery. The presser foot driving cam and the presser foot transmission assembly 4 can completely adopt existing transmission structures, and the presser foot driver 5 can adopt an existing structure similar to or consistent with the needle bar driver 21. By directly driving the presser foot 51 to act through the setting of the presser foot driver 5 in the present utility model, it can completely replace the existing presser foot spring on the needle bar to drive the presser foot. In this way, the problem that the needle bar continues to move downward while still needing to compress the presser foot spring after the presser foot touches the bottom is effectively avoided, thereby reducing the resistance for the transmission shaft 3 to continue driving the needle bar downward, effectively reducing the load on the body driving motor and the main shaft 9, reducing the load of each head by 1200 g on average, and further improving the transmission accuracy of the body driving motor and the main shaft 9. Thus, it is beneficial to reduce the addition of more heads.

[0034] Since there is no need to set a presser foot spring, when the machine needle moves upward from the lowest point during the downward movement of the machine needle, the output of the transmission shaft and the motor is more stable, making the head and the entire body operate more balanced and stable.

[0035] As a preferred embodiment of guiding the presser foot driver 5, in this embodiment, the guide rod is the needle bar guide rod 23 installed with the needle bar driver 21, and the presser foot driver 5 is arranged below the needle bar driver 21. That is, the needle bar driver 21 and the presser foot driver 5 share the same guide rod.

[0036] As another embodiment of guiding the presser foot driver 5, the guide rod is an independent presser foot guide rod, and the presser foot guide rod is arranged non-coaxially with the needle bar guide rod installed with the needle bar driver 21. That is, two guide rods can be set at the corresponding position of the head shell 1, one of which is the needle bar guide rod and the other is the presser foot guide rod. The presser foot guide rod and the needle bar guide rod are arranged with different axes and do not interfere with each other.

[0037] The described presser foot drive structure includes a card slot provided on the presser foot driver 5 and cooperating with the corresponding position of the presser foot at the working station.

[0038] The presser foot jumping structure 6 can be independently provided as needed to meet the needs of embroidery. The presser foot jumping structure 6 can include an independent second jumping drive motor, a second swing arm provided on the shaft of the second jumping drive motor, and a transmission component connecting the second swing arm to drive the deflection and jump of the presser foot driver 5. The jumping transmission component can adopt a jumping transmission component similar to the needle bar jumping in the prior art.

[0039] The described needle bar jumping structure includes a jumping drive motor 7 and a first swing arm 71 provided on the shaft of the jumping drive motor to drive the deflection and jump of the needle bar driver 21; the presser foot jumping structure 6 includes a second swing arm 61 to drive the deflection and jump of the presser foot driver 5, and a second transmission link 8 for transmitting the power of the first swing arm 71 to the second swing arm 61 is provided between the first and second swing arms.

[0040] A first transmission component 72 for driving the deflection and jump of the needle bar driver 21 is provided on the first swing arm 71; a second transmission component 62 for driving the deflection and jump of the presser foot driver 5 is provided on the second swing arm 61.

[0041] The described presser foot driver 5 includes a sliding block 53 sliding on a guide rod (and the needle bar guide rod 23), a rotatable and resetable rotating block 54 provided on the sliding block 53. A card slot 55 cooperating with the driving convex block 52 provided on the presser foot is provided on the rotating block 54. A guiding inclined surface 56 for guiding the driving convex block 52 provided on the presser foot to enter the card slot through the deflection of the presser foot driver 5 is provided on the upper side of the card slot 55. The card slot 55 constitutes the presser foot drive structure and cooperates with the driving convex block 52 on the presser foot rod to drive the presser foot to perform a reciprocating motion adapted to embroidery.

[0042] In the embodiment of the present invention, the presser foot 51 can include a presser foot rod and a presser foot body structure for pressing the cloth connected to the presser foot rod. The driving convex block 52 is usually provided on the presser foot rod. Of course, the presser foot rod can be integrally provided with the presser foot body structure.

[0043] The second transmission component 62 includes a protruding rod 63 provided on the second swing arm 61. A pressing wheel 64 is provided on the protruding rod 63. A transmission track 57 cooperating with the pressing wheel 64 is provided on the presser foot driver 5.

[0044] A buffer spring for buffering the impact of the presser foot is provided between the rotating block 54 and the sliding block 53 of the presser foot driver 5. When the presser foot presses the cloth and accidentally encounters a hard object, the buffer spring can effectively buffer the hard impact of the presser foot on the hard object, playing a role in protecting the presser foot or the machine head.

[0045] An embroidery machine, on which a machine head that is any one or any combination of the above-mentioned solutions is installed. The embroidery machine includes a machine body, and at least one of the above-mentioned machine heads is provided on the machine body.

Claims

1. A machine head, comprising a machine head housing, a needle bar, a presser foot, a transmission shaft, a needle bar driver, a needle bar jumping structure, a needle bar driving cam and a presser foot driving cam, wherein the needle bar driving cam and the presser foot driving cam are arranged on the transmission shaft, and further comprising a needle bar driving assembly for transmitting the power of the needle bar driving cam to the needle bar driver, and a presser foot driving assembly for transmitting the power of the presser foot driving cam, characterized in that: It also includes a presser foot driver which is arranged on the guide rod, cooperates with the presser foot transmission assembly and receives power transmitted by the presser foot transmission assembly and can realize jumping. The presser foot driver is provided with a presser foot driving structure which drives the presser foot to move up and down with the presser foot driver. The presser foot driver is provided with a presser foot jumping structure which drives the presser foot driver to realize jumping. The guide rod is installed at the corresponding position of the machine head housing.

2. The handpiece according to claim 1, characterized in that: The guide rod is a needle bar guide rod equipped with a needle bar driver, and the presser foot driver is arranged below the needle bar driver.

3. The handpiece according to claim 1, characterized in that: The guide rod is a presser foot guide rod, and the presser foot guide rod is non-coaxially arranged with the needle bar guide rod on which the needle bar driver is installed.

4. The handpiece according to claim 1, characterized in that: The presser foot driving structure comprises a clamping groove arranged on the presser foot driver and matched with the corresponding position of the presser foot located at the working station.

5. The handpiece according to claim 1, characterized in that: The presser foot jumping structure comprises an independent second jumping driving motor, a second swing arm arranged on the shaft of the second jumping driving motor, and a transmission component connected to the second swing arm to drive the presser foot driver to deflect and jump.

6. The handpiece according to claim 1, characterized in that: The needle bar jumping structure includes a jumping drive motor and a first swing arm arranged on the jumping drive motor shaft to drive the needle bar driver to deflect and jump; the presser foot jumping structure includes a second swing arm that drives the presser foot driver to deflect and jump, and a second transmission connecting rod is arranged between the first and second swing arms to transmit the power of the first swing arm to the second swing arm.

7. The handpiece according to claim 6, characterized in that: The first swing arm is provided with a first transmission assembly for driving the needle bar driver to deflect and jump; the second swing arm is provided with a second transmission assembly for driving the needle bar driver to deflect and jump.

8. The handpiece according to claim 1, characterized in that: The presser foot sleeve is arranged on the needle bar; or / and the presser foot sleeve is arranged on a guide rod which is not coaxial with the needle bar.

9. The handpiece according to claim 1, characterized in that: The presser foot driver comprises a sliding block sliding on the guide rod, a rotating block rotatable and repositionable on the sliding block, the rotating block is provided with a slot matching with the driving protrusion provided for the presser foot, the slot is located on the upper side and is provided with a guiding inclined surface for guiding the driving protrusion provided for the presser foot to be deflected into the slot through the presser foot driver, and the slot constitutes a presser foot driving structure.

10. The handpiece according to claim 7, characterized in that: The second transmission assembly comprises a protruding rod arranged on the second swing arm, a pressing wheel is arranged on the protruding rod, and a transmission track matched with the pressing wheel is arranged on the presser foot driver.

11. The handpiece according to claim 1, characterized in that: The presser foot driver comprises a sliding block sliding on the guide rod, a rotating block arranged on the sliding block and capable of rotating and resetting, and a buffer spring for buffering the impact of the presser foot is arranged between the rotating block and the sliding block.

12. An embroidery machine equipped with the machine head according to any one of claims 1 to 11, characterized in that: The machine body comprises a machine body, and at least one machine head is arranged on the machine body.

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