Double-crank mechanism embroidery machine head

Abstract

The utility model provides a double crank mechanism embroidery machine head relates to sewing embroidery technical field, including the casing, be equipped with the presser foot drive crank in the casing, the presser foot drive crank is connected with needle bar drive crank through same transmission shaft fixedly. Adopt double crank mechanism respectively simultaneously drive needle bar main part and presser foot main part, can make both sides keep a balanced state of opposition in the movement, the movement between two cranks can offset each other axial centrifugal swing, effectively control the vibration produced in axial, reduce the vibration and noise produced when equipment works. Through the coordinated transmission between control connecting rod, make presser foot main part cloth time meet the cooperation between the sewing mechanism, effectively improve the sewing performance. Through a plurality of connecting rod transmission, make presser foot main part and needle bar main part's movement more coordinated, in the both separation and contact instant is in the same speed state, reduce the vibration produced between the impact when mechanism movement, reduce noise and improve the sewing quality.

Description

Technical Field

[0001] This utility model relates to the field of sewing and embroidery technology, and in particular to a double crank mechanism embroidery machine head. Background Technology

[0002] The embroidery machine head contains key sewing modules such as the needle bar, presser foot, and thread take-up mechanism. It plays a crucial role in stitch formation during sewing and embroidery, and the coordinated movements of these mechanisms have interconnected time requirements. Therefore, the quality of the machine head structure directly affects the stability of the embroidery process. Most embroidery machines on the market adopt a multi-head, series-connected design, with the machine head components accounting for over 80% of the total machine parts. Therefore, the failure rate, noise, and vibration of embroidery machines primarily originate from the machine head components. Especially with the trend towards multi-head and ultra-high-speed embroidery machines, the stability and noise control requirements of the machine are particularly significant for the machine head.

[0003] Currently, one type of double-crank mechanism embroidery machine head uses a disc cam structure as the motion drive source for the presser foot movement. This type of cam is mainly made of engineering plastics. The biggest advantage of this type of cam is that the curve can be arbitrarily designed to control the movement trajectory of the presser foot. However, due to the shortcomings of material strength and processing precision, problems such as large-scale part damage and excessive noise often occur during operation. The current structure can no longer meet the needs of the development of embroidery machines. Utility Model Content

[0004] The purpose of this invention is to address the problem that in the existing technology, the presser foot movement mainly uses a disc cam structure as the motion drive source. This type of cam is mainly made of engineering plastics. The biggest advantage of this type of cam is that the curve can be arbitrarily designed to control the movement trajectory of the presser foot. However, due to the shortcomings of material strength and processing accuracy, problems such as large-scale part damage and excessive noise often occur during operation. The current structure can no longer meet the needs of the development of embroidery machines. Therefore, a double crank mechanism embroidery machine head is proposed.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a double-crank mechanism embroidery machine head, comprising a machine housing, a presser foot drive crank provided inside the machine housing, a needle bar drive crank fixedly connected to the presser foot drive crank via the same transmission shaft, a guide connecting rod pin installed inside the machine housing, a guide connecting rod body installed at one end of the guide connecting rod pin, a control connecting rod rotatably connected at one end of the guide connecting rod body, a drive connecting rod rotatably connected at one end of the control connecting rod, a transition connecting rod installed at one end of the drive connecting rod, a presser foot driver installed at one end of the transition connecting rod, a pin installed at one end of the presser foot driver, a guide cam installed inside the machine housing, the end of the pin away from the presser foot driver inserted into the guide cam, a presser foot body installed at one end of the presser foot driver, a needle bar body installed inside the presser foot body, and a needle clamp installed at the bottom end of the needle bar body.

[0006] Preferably, a noise-absorbing rubber ring is installed between the needle clamp and the needle bar body.

[0007] Preferably, when the presser foot drive crank and the needle bar drive crank are running synchronously, the presser foot drive crank and the needle bar drive crank perform symmetrical offset axial movements.

[0008] Preferably, one end of the support pin is mounted on the drive link.

[0009] Preferably, one end of the presser foot drive crank is mounted to the control linkage.

[0010] Preferably, the guide cam has a limiting groove that matches the pin.

[0011] Preferably, the pin is relatively long.

[0012] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0013] In this invention, a double-crank mechanism is used to simultaneously drive the needle bar body and the presser foot body, maintaining a balanced opposing state during movement. The movement between the two cranks cancels out axial centrifugal swing, effectively controlling axial vibration and reducing vibration and noise during operation. By controlling the coordinated transmission between the connecting rods, the presser foot body's fabric pressing time matches the coordination between the sewing mechanisms, effectively improving sewing performance. Through multiple linkages, the movement of the presser foot and needle bar is more coordinated, ensuring they move at the same speed at the moment of separation and contact. This reduces vibrations caused by impacts during movement, lowers noise, and improves sewing quality. The presser foot drive crank and needle bar drive crank employ a high-speed bearing structure, both fixed on the same drive shaft. During operation, they drive the guide linkage, control linkage, drive linkage, and adapter linkage respectively, maintaining symmetrical axial movement to keep them balanced and effectively reducing vibrations from axial movement. When the presser foot driver descends, it contacts the needle bar at approximately the same speed, causing the needle clip to separate from the presser foot and the noise-absorbing rubber ring. This effectively reduces impact vibrations, lowers noise, and improves sewing quality. This design makes the structure more suitable for high-speed embroidery and reduces wear on parts. Attached Figure Description

[0014] Figure 1 This utility model provides a schematic diagram of the internal structure of the housing of an embroidery machine head with a double crank mechanism;

[0015] Figure 2 This utility model provides a schematic diagram of the external structure of the presser foot drive crank of the head of a double-crank mechanism embroidery machine.

[0016] Figure 3 This utility model provides a schematic diagram of the external structure of the drive linkage of a double-crank mechanism embroidery machine head;

[0017] Figure 4 This utility model provides a side view of the presser foot body of a double-crank mechanism embroidery machine head;

[0018] Figure 5 This utility model provides a schematic diagram of the external structure of the presser foot driver of a double-crank mechanism embroidery machine head;

[0019] Figure 6 This utility model presents a schematic diagram of the external structure of the sound-absorbing rubber ring of the head of a double-crank mechanism embroidery machine.

[0020] Illustration: 1. Housing; 2. Presser foot drive crank; 3. Needle bar drive crank; 4. Support pin; 5. Guide link pin; 6. Guide link body; 7. Control link; 8. Drive link; 9. Adapter link; 10. Presser foot driver; 11. Presser foot body; 12. Needle bar body; 13. Noise-absorbing rubber ring; 14. Needle clamp; 15. Guide cam; 16. Pin. Detailed Implementation

[0021] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0022] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0023] Example 1, as Figure 1-6 As shown, this utility model provides a double-crank mechanism embroidery machine head, including a machine housing 1. A presser foot drive crank 2 is provided inside the machine housing 1. The presser foot drive crank 2 is fixedly connected to a needle bar drive crank 3 via the same transmission shaft. A guide connecting rod pin 5 is installed inside the machine housing 1. A guide connecting rod body 6 is installed at one end of the guide connecting rod pin 5. A control connecting rod 7 is rotatably connected to one end of the guide connecting rod body 6. A drive connecting rod 8 is rotatably connected to one end of the control connecting rod 7. A transition connecting rod 9 is installed at one end of the drive connecting rod 8. A presser foot driver 10 is installed at one end of the transition connecting rod 9. A pin 16 is installed at one end of the presser foot driver 10. A guide cam 15 is installed inside the machine housing 1. The end of the pin 16 away from the presser foot driver 10 is inserted into the guide cam 15. A presser foot body 11 is installed at one end of the presser foot driver 10. A needle bar body 12 is installed inside the presser foot body 11. A needle clamp 14 is installed at the bottom end of the needle bar body 12.

[0024] The overall effect of Embodiment 1 is that the presser foot drive crank 2 and the needle bar drive crank 3 adopt a high-speed bearing structure, both fixed on the same transmission shaft. During operation, they respectively drive the guide connecting rod body 6, control connecting rod 7, drive connecting rod 8, and adapter connecting rod 9. Furthermore, they exhibit symmetrical offset axial movement, maintaining a balanced state and effectively reducing vibrations generated by axial movement. The guide connecting rod pin 5 is fixed to the housing 1, and one end of the guide connecting rod body 6 is engaged with the guide connecting rod pin 5, ensuring that the presser foot drive crank 2 rotates along a predetermined trajectory during movement. The control connecting rod 7 connects the presser foot drive crank 2 to the drive connecting rod 8 for transmission. By controlling the positional relationship between the control connecting rod 7 and the drive connecting rod 8, the motion law of the presser foot drive crank 2 and the drive connecting rod 8 can be effectively controlled and changed. The drive connecting rod 8 and the presser foot driver 10 are connected for transmission via the adapter connecting rod 9. Through the transmission relationship between the drive connecting rod 8 and the adapter connecting rod 9, the motion law of the drive connecting rod 8 and the presser foot driver 10 can be effectively controlled and changed. The presser foot drive crank 2 is connected via the aforementioned multi-link linkage, forming an effective transmission chain. When the angle between the drive link 8 and the adapter link 9 is between 175 and 185 degrees, the presser foot driver 10 can be in a stopped state, and the presser foot body 11 can also be in a stationary state, effectively achieving the aforementioned stable presser foot pressing of the fabric, stabilizing the sewing process, improving stitch quality, and reducing thread breakage. When the angle between the guide link body 6 and the control link 7 is close to a flat angle, the movement speed of the drive link 8 can be changed, creating a differential speed change with the needle bar movement. This effectively controls the running speed and stroke of the presser foot driver 10, ensuring coordinated movement between the presser foot body 11 and the needle bar body 12.

[0025] Example 2, as Figure 1-6 As shown, a noise-absorbing rubber ring 13 is installed between the needle clip 14 and the needle bar body 12. When the presser foot drive crank 2 and the needle bar drive crank 3 run synchronously, the presser foot drive crank 2 and the needle bar drive crank 3 make symmetrical offset axial movements. One end of the support pin 4 is installed on the drive connecting rod 8, and one end of the presser foot drive crank 2 is installed with the control connecting rod 7. A limiting groove matching the pin 16 is opened in the guide cam 15. The pin 16 is relatively long.

[0026] The effect achieved by the entire embodiment 2 is that the presser foot driver 10 is only fixed at one point, pin 16. When the presser foot driver 10 reciprocates at high speed, it may deflect left and right, which may cause the connection between pin 16 and the adapter rod 9 to wear and be damaged. Therefore, the pin 16 is lengthened and a guide cam 15 is added to insert the pin 16 of the presser foot driver 10 into the guide cam 15, so as to ensure the stability of the presser foot driver 10 when it moves up and down and reduce the damage of parts. When the presser foot driver 10 descends, when the presser foot driver 10 and the needle bar body 12 are at basically the same speed, the presser foot body 11 and the presser foot driver 10 come into contact at this time. The needle clip 14 separates from the presser foot body 11 and the noise-absorbing rubber ring 13, which effectively reduces the impact vibration of the mechanism, reduces noise and improves the sewing quality. Through the above design, this structure is more suitable for high-speed embroidery and reduces the wear of parts.

[0027] Working Principle: In use, the presser foot drive crank 2 and needle bar drive crank 3 employ a high-speed bearing structure, both fixed to the same transmission shaft. During operation, they respectively drive the guide connecting rod body 6, control connecting rod 7, drive connecting rod 8, and adapter connecting rod 9. Furthermore, they exhibit symmetrical offset axial movement, maintaining balance and effectively reducing vibrations generated by axial motion. The guide connecting rod pin 5 is fixed to the housing 1, and one end of the guide connecting rod body 6 engages with the guide connecting rod pin 5, ensuring that the presser foot drive crank 2 rotates along a predetermined trajectory during movement. The control connecting rod 7 connects the presser foot drive crank 2 to the drive connecting rod 8 for transmission. By controlling the positional relationship between the control connecting rod 7 and the drive connecting rod 8, the motion patterns of the presser foot drive crank 2 and the drive connecting rod 8 are effectively controlled and altered. The drive connecting rod 8 and the presser foot driver 10 are connected and transmitted via the adapter connecting rod 9. The transmission relationship between the drive connecting rod 8 and the adapter connecting rod 9 effectively controls and alters the motion patterns of the drive connecting rod 8 and the presser foot driver 10. The presser foot actuator 10 is fixed at only one point, pin 16. During high-speed reciprocating motion, the presser foot actuator 10 may deflect left or right, causing wear and damage to the connection between pin 16 and the adapter rod 9. Therefore, pin 16 is lengthened, and a guide cam 15 is added to insert pin 16 into the guide cam 15, ensuring stability during the presser foot actuator 10's up-and-down movement and reducing component damage. The presser foot drive crank 2 is connected via the aforementioned multi-link linkage, forming an effective transmission chain. When the angle between the drive link 8 and the adapter link 9 is between 175 and 185 degrees, the presser foot actuator 10 can be in a stopped state, and the adapter link to the presser foot body 11 is also stationary, effectively achieving stable fabric pressing by the presser foot, stabilizing the sewing process, improving stitch quality, and reducing thread breakage. When the angle between the guide link body 6 and the control link 7 is close to a flat angle, the speed of the drive link 8 can be changed, creating a differential speed change with the needle bar movement. Effective control of the presser foot driver 10's operating speed and stroke ensures coordinated movement between the presser foot body 11 and the needle bar body 12. By altering the motion pattern, when the presser foot driver 10 descends, it contacts the needle bar body 11 at approximately the same speed as the needle bar body 12. At this point, the needle clip 14 separates from the presser foot body 11 and the noise-absorbing rubber ring 13, effectively reducing mechanical impact vibration, noise, and improving sewing quality. This design is more suitable for high-speed embroidery and reduces wear on parts.

[0028] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A double-crank mechanism embroidery machine head, comprising a housing (1), characterized in that: The housing (1) contains a presser foot drive crank (2), which is fixedly connected to a needle bar drive crank (3) via the same transmission shaft. A guide rod pin (5) is installed inside the housing (1). A guide rod body (6) is installed at one end of the guide rod pin (5). A control rod (7) is rotatably connected at one end of the guide rod body (6). A drive rod (8) is rotatably connected at one end of the control rod (7). A transition rod (9) is installed at one end of the drive rod (8). One end of the connecting rod (9) is equipped with a presser foot driver (10), and one end of the presser foot driver (10) is equipped with a pin (16). A guide cam (15) is installed inside the housing (1). The end of the pin (16) away from the presser foot driver (10) is inserted into the guide cam (15). One end of the presser foot driver (10) is equipped with a presser foot body (11). A needle bar body (12) is installed inside the presser foot body (11). A needle clip (14) is installed at the bottom end of the needle bar body (12).

2. The double-crank mechanism embroidery machine head according to claim 1, characterized in that: A noise-absorbing rubber ring (13) is installed between the needle clip (14) and the needle bar body (12).

3. The double-crank mechanism embroidery machine head according to claim 1, characterized in that: When the presser foot drive crank (2) and the needle bar drive crank (3) are running synchronously, the presser foot drive crank (2) and the needle bar drive crank (3) make symmetrical offset axial movements.

4. The double-crank mechanism embroidery machine head according to claim 1, characterized in that: A support pin (4) is installed at one end of the drive link (8).

5. The double-crank mechanism embroidery machine head according to claim 1, characterized in that: One end of the presser foot drive crank (2) is mounted to the control linkage (7).

6. The double-crank mechanism embroidery machine head according to claim 1, characterized in that: The guide cam (15) has a limiting groove that matches the pin (16).

7. The double-crank mechanism embroidery machine head according to claim 1, characterized in that: The pin (16) is relatively long.

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