Differential adjustment device and sewing machine having the same

Abstract

The utility model provides a kind of differential adjusting device and sewing machine with it, comprising: main shaft, can rotate around its own axis;Transmission shaft, can rotate around its own axis, and it is parallel and interval arrangement with main shaft, first transmission component is arranged between main shaft and transmission shaft, to drive transmission shaft rotation by first transmission component;Swing component, can rotate around predetermined axis;Intermediate transmission component, with transmission shaft, first transmission component and swing component are all hinged, to drive transmission shaft rotation under the drive of first transmission component and swing component;Drive part, second transmission component is arranged between drive part and swing component, including first crank connecting rod mechanism, drive shaft and second crank connecting rod mechanism that are sequentially connected from drive part to swing component, to drive swing component rotation under the drive of second transmission component, to solve the problem that the upper differential sewing machine in prior art needs manual adjustment when adjusting differential amount, leading to the problem of large adjustment error.

Description

Technical Field

[0001] This utility model relates to the field of sewing equipment technology, and more specifically, to a differential adjustment device and a sewing machine having the same. Background Technology

[0002] In the field of sewing equipment, differential sewing machines are widely used in processes such as curved hem of shirts, sleeves of suits, hem seams of down jackets, and zipper installation to achieve wrinkle prevention and shrinkage effects, meeting the needs of high-quality sewing.

[0003] Currently, the differential sewing machines on the market mainly use a manual adjustment method in the form of a stitch distance dial when adjusting the differential amount. That is, the swing direction and angle of the upper differential feed shaft are adjusted by manually rotating the stitch distance knob.

[0004] However, this manual adjustment method has the following technical drawbacks: manual adjustment usually requires stopping the machine, which not only increases the operator's labor intensity but also reduces production efficiency. Especially in continuous production, frequent machine stops for adjustment will seriously affect the smoothness of the production line. The scale lines on the stitch length knob can only represent a rough value, and the range between two scale lines actually represents a numerical range. This method leads to a large error during adjustment, especially when fine adjustments are needed. This error will be more obvious and difficult to meet the needs of high-precision sewing. In addition, the adjuster often needs to try many times to find the appropriate stitch length. This process is both time-consuming and labor-intensive, especially when multiple fine adjustments are needed, resulting in low adjustment efficiency. Utility Model Content

[0005] The main objective of this invention is to provide a differential adjustment device and a sewing machine having the same, so as to solve the problem that in the prior art, differential sewing machines require manual adjustment when adjusting the differential amount, resulting in a large adjustment error.

[0006] To achieve the above objectives, according to one aspect of the present invention, a differential adjustment device is provided, comprising: a main shaft, which is rotatable about its own axis and is connected to a differential tooth assembly for driving the upper differential tooth of the differential tooth assembly to perform lifting and lowering movements; a transmission shaft, which is rotatable about its own axis and is connected to the differential tooth assembly for driving the upper differential tooth of the differential tooth assembly to perform back-and-forth movements, the transmission shaft being parallel to and spaced apart from the main shaft, and a first transmission component being provided between the main shaft and the transmission shaft for driving the transmission shaft to rotate through the first transmission component; a swing assembly, which is rotatable about a predetermined axis parallel to the main shaft; an intermediate transmission component, which is hinged to the transmission shaft, the first transmission component, and the swing assembly for driving the transmission shaft to rotate under the drive of the first transmission component and the swing assembly; and a drive component, which is connected to the swing assembly through a second transmission component, the second transmission component including a first crank-connecting rod mechanism, a drive shaft, and a second crank-connecting rod mechanism sequentially connected from the drive component to the swing assembly for driving the swing assembly to rotate under the drive of the second transmission component.

[0007] Furthermore, the drive shaft can rotate about its own axis, and the drive shaft, main shaft, and transmission shaft are all parallel to each other and spaced apart; and / or; the first crank-connecting rod mechanism includes a first crank, a first connecting rod, and a second crank that are hinged in sequence, the first crank is fixedly connected to the output shaft of the drive component, and the first crank is hinged to the first end of the first connecting rod, the second crank is fixedly connected to the first end of the drive shaft, and the second crank is hinged to the second end of the first connecting rod.

[0008] Furthermore, the first crank-connecting rod mechanism further includes a first connecting pin. The first crank includes a first crank fixing part and a first crank connecting part connected in sequence. The first crank fixing part is provided with a first crank fixing part pin hole, and the first crank connecting part is provided with a first crank connecting part pin hole. The first crank fixing part pin hole is fixedly sleeved on the output shaft of the drive component, and the first connecting pin is rotatably passed through the first crank connecting part pin hole and the first end of the first connecting rod; and / or the first crank-connecting rod mechanism further includes a second connecting pin. The second crank includes a second crank fixing part and a second crank connecting part connected in sequence. The second crank fixing part is provided with a second crank fixing part pin hole, and the second crank connecting part is provided with a second crank connecting part pin hole. The second crank fixing part pin hole is fixedly sleeved on the first end of the drive shaft, and the second connecting pin is rotatably passed through the second crank connecting part pin hole and the second end of the first connecting rod.

[0009] Furthermore, the second crank-connecting rod mechanism includes a third crank and a second connecting rod. The third crank is fixedly connected to the second end of the drive shaft, and the third crank is hinged to the first end of the second connecting rod. The second end of the second connecting rod is hinged to the swing assembly.

[0010] Furthermore, the second crank-connecting rod mechanism includes a third connecting pin. The third crank includes a third crank fixing part and a third crank connecting part connected in sequence. The third crank fixing part is provided with a third crank fixing part pin hole, and the third crank connecting part is provided with a third crank connecting part pin hole. The third crank fixing part pin hole is fixedly sleeved on the second end of the drive shaft, and the third connecting pin is rotatably passed through the third crank connecting part pin hole and the first end of the second connecting rod.

[0011] Furthermore, the swing assembly also includes: a swing seat, which includes two side plates and a base plate. The two side plates are arranged opposite each other along a predetermined axis, and the base plate is disposed between the two side plates to be connected to the two side plates respectively, so as to form a mounting groove for accommodating at least a portion of the first transmission assembly and at least a portion of the intermediate transmission assembly; a connecting shaft, the predetermined axis being the axis of the connecting shaft; wherein, the side plate away from the transmission shaft is provided with a first side plate pin hole, a second side plate pin hole and a third side plate pin hole arranged sequentially at intervals along a predetermined direction, and the side plate near the transmission shaft is provided with a second side plate pin hole and a third side plate pin hole arranged sequentially at intervals along a predetermined direction, the connecting shaft is rotatably passed through the second side plate pin hole, and a fourth connecting pin is also provided on the second crank connecting rod mechanism, the fourth connecting pin being rotatably passed through the second end of the second connecting rod and the first side plate pin hole.

[0012] Furthermore, the intermediate transmission assembly includes: a first swing link, at least a portion of which is disposed in a mounting groove, and a first end of which is hinged to a pin hole in a third side plate; a second swing link, the first end of which is hinged to a second end of the first swing link and to the output end of the first transmission assembly; and a first swing crank, the first end of which is hinged to a second end of the second swing link, and the second end of which is fixedly connected to a transmission shaft.

[0013] Furthermore, the intermediate transmission assembly also includes: a fifth connecting pin, which is rotatably disposed in the pin hole of the third side plate and the first end of the first swing link; a sixth connecting pin, which is rotatably disposed in the second end of the first swing link, the first end of the second swing link, and the output end of the first transmission assembly; and a seventh connecting pin. The first swing crank includes a first swing crank fixing part and a first swing crank connecting part connected in sequence. The first swing crank fixing part is provided with a first swing crank fixing part pin hole, and the first swing crank connecting part is provided with a first swing crank connecting part pin hole. The seventh connecting pin is rotatably disposed in the first swing crank connecting part pin hole and the second end of the second swing link. The first swing crank fixing part pin hole is fixedly sleeved on the transmission shaft.

[0014] Furthermore, the first transmission assembly also includes: an eccentric wheel, which is fixedly sleeved on the main shaft; and a third swing link, the first end of which is fixedly sleeved on the eccentric wheel, and the second end of which is hinged to both the first end of the second swing link and the second end of the first swing link.

[0015] According to a second aspect of the present invention, a sewing machine is also provided, including the differential adjustment device described above.

[0016] By applying the technical solution of this utility model, the second transmission assembly, composed of a first crank-connecting rod mechanism, a drive shaft, and a second crank-connecting rod mechanism, can achieve precise angle and direction control of the swing assembly. This precise control is further translated into precise adjustment of the rotation of the transmission shaft, enabling the upper differential tooth of the differential tooth assembly to achieve the ideal differential effect in various sewing requirements, reducing material waste and improving product quality. Through the coordinated work of the intermediate transmission assembly, the first transmission assembly, and the swing assembly, it can quickly respond to the signals of the drive component, ensuring timely differential adjustment even on a high-speed sewing machine, guaranteeing sewing quality. Furthermore, through the driving capability, it can automatically adjust the differential amount of the upper differential tooth of the differential tooth assembly without manual intervention, greatly improving the efficiency and continuity of sewing operations. This effectively solves the problem in the prior art where upper differential sewing machines require manual adjustment when adjusting the differential amount, resulting in large adjustment errors. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0018] Figure 1 A schematic diagram of the differential adjustment device according to the present invention in one direction is shown; and

[0019] Figure 2 A schematic diagram of the differential adjustment device according to the present invention is shown in another direction;

[0020] Figure 3 It shows Figure 2 A magnified view of point A shown below;

[0021] Figure 4 The figure shows a schematic diagram of the structure of the first crank according to the present invention;

[0022] Figure 5 The figure shows a schematic diagram of the structure of the second crank according to the present invention;

[0023] Figure 6The figure shows a schematic diagram of the structure of the third crank according to the present invention;

[0024] Figure 7 The figure shows a schematic diagram of the structure of the swing seat according to the present invention;

[0025] Figure 8 The figure shows a schematic diagram of the structure of the first oscillating crank according to the present invention.

[0026] The above figures include the following reference numerals:

[0027] 10. Main spindle; 20. Drive shaft; 30. First transmission assembly; 40. Swing assembly; 50. Intermediate transmission assembly; 60. Drive component; 70. Second transmission assembly; 80. Differential gear assembly;

[0028] 610. Output shaft;

[0029] 310. Eccentric wheel; 320. Third swing linkage;

[0030] 410, Swing seat; 420, Mounting slot; 430, Connecting shaft;

[0031] 411. Side panel; 412. Bottom panel;

[0032] 510. First swing link; 520. Second swing link; 530. First swing crank;

[0033] 411-1, First side plate pin hole; 411-2, Second side plate pin hole; 411-3, Third side plate pin hole;

[0034] 710. First crank-connecting rod mechanism; 720. Drive shaft; 730. Second crank-connecting rod mechanism;

[0035] 711. First crank; 712. First connecting rod; 713. Second crank;

[0036] 731. Third crank; 732. Second connecting rod;

[0037] 711-1, First crank fixing part; 711-2, First crank connecting part; 711-3, Pin hole of the first crank fixing part; 711-4, Pin hole of the first crank connecting part;

[0038] 713-1, Second crank fixing part; 713-2, Second crank connecting part; 713-3, Pin hole of second crank fixing part; 713-4, Pin hole of second crank connecting part;

[0039] 731-1, Third crank fixing part; 731-2, Third crank connecting part; 731-3, Third crank fixing part pin hole; 731-4, Third crank connecting part pin hole;

[0040] 530-1, First oscillating crank fixing part; 530-2, First oscillating crank connecting part; 530-3, Pin hole of the first oscillating crank fixing part; 530-4, Pin hole of the first oscillating crank connecting part;

[0041] 100, First connecting pin; 200, Second connecting pin; 300, Third connecting pin; 400, Fourth connecting pin; 500, Fifth connecting pin; 600, Sixth connecting pin; 700, Seventh connecting pin. Detailed Implementation

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0043] like Figures 1 to 8 As shown, a differential adjustment device of this utility model includes: a main shaft 10, which is rotatable around its own axis and is connected to a differential tooth assembly 80 for driving the upper differential tooth of the differential tooth assembly 80 to move up and down; a transmission shaft 20, which is rotatable around its own axis and is connected to the differential tooth assembly 80 for driving the upper differential tooth of the differential tooth assembly 80 to move back and forth, the transmission shaft 20 being parallel to and spaced apart from the main shaft 10, and a first transmission component 30 being provided between the main shaft 10 and the transmission shaft 20 for driving the transmission shaft 20 to rotate; and a swing component 40, which is rotatable around a predetermined axis. The linear rotation is parallel to the main shaft 10; the intermediate transmission assembly 50 is hinged to the transmission shaft 20, the first transmission assembly 30 and the swing assembly 40, so as to drive the transmission shaft 20 to rotate under the drive of the first transmission assembly 30 and the swing assembly 40; the driving component 60 is provided with a second transmission assembly 70 between the driving component 60 and the swing assembly 40, the second transmission assembly 70 includes a first crank-connecting rod mechanism 710, a drive shaft 720 and a second crank-connecting rod mechanism 730 connected in sequence from the driving component 60 to the swing assembly 40, so as to drive the swing assembly 40 to rotate under the drive of the second transmission assembly 70.

[0044] As can be seen, the second transmission assembly 70, composed of the first crank-connecting rod mechanism 710, the drive shaft 720, and the second crank-connecting rod mechanism 730, can achieve precise angle and direction control of the swing assembly 40. This precise control is further transformed into precise adjustment of the rotation of the transmission shaft 20, enabling the upper differential tooth of the differential tooth assembly 80 to achieve the ideal differential effect in various sewing requirements, reducing material waste and improving product quality. Through the coordinated work of the intermediate transmission assembly 50, the first transmission assembly 30, and the swing assembly 40, it can quickly respond to the signal of the drive component 60, ensuring timely differential adjustment even on a high-speed sewing machine, guaranteeing sewing results. Furthermore, through the driving capability of the drive component 60, the differential amount of the upper differential tooth of the differential tooth assembly 80 can be automatically adjusted without manual intervention, greatly improving the efficiency and continuity of sewing operations. This effectively solves the problem in the prior art where upper differential sewing machines require manual adjustment when adjusting the differential amount, resulting in large adjustment errors.

[0045] The differential tooth assembly 80 of this utility model also includes a differential tooth lifting mechanism and a differential tooth translation mechanism. The differential tooth lifting mechanism is connected between the main shaft 10 and the upper differential tooth and is used to drive the upper differential tooth to lift. The differential tooth translation mechanism is connected between the transmission shaft 20 and the upper differential tooth and is used to drive the upper differential tooth to move back and forth.

[0046] Preferably, the differential tooth lifting mechanism includes a first differential eccentric wheel, a first differential connecting rod, a first differential crank, a first swing shaft, a second swing crank, a drive rod, a differential lifting rod, a roller, and a differential tooth fixing seat.

[0047] The first differential eccentric wheel is fixedly mounted on the main shaft 10. The first end of the first differential connecting rod is sleeved on the first differential eccentric wheel, and the second end is rotatably connected to the first differential crank fixedly mounted on the first swing shaft, so that the first swing shaft can swing around its own axis through the rotation of the first differential eccentric wheel. The first end of the second swing crank is fixedly connected to the first swing shaft, and the second end is provided with a rotatable rotating body that abuts against the first end of the drive rod. The drive rod is rotatably mounted on the pressure rod guide, and the second end of the drive rod abuts against the top of the differential lifting rod. The differential lifting rod is rotatably connected to the pressure rod guide, so that the differential lifting rod can be raised and lowered through the swing of the drive rod. The roller is rotatably mounted at the bottom end of the differential lifting rod and is located in the sliding groove of the differential tooth fixing seat for mounting the upper differential tooth, for driving the upper differential tooth to rise and fall.

[0048] Preferably, the differential tooth translation mechanism includes a fork crank, a first slider, a feeding rocker crank, a feeding rocker shaft, a feeding rocker arm bushing, and a rocker arm shaft.

[0049] The fork crank is fixedly mounted on the transmission shaft 20. The first slider is rotatably mounted on the first end of the feeding rocker crank and is slidably connected in the fork groove of the fork crank to drive the feeding rocker crank to swing back and forth. The second end of the feeding rocker crank is fixedly mounted on the feeding rocker shaft that can rotate around its own axis. The feeding rocker arm bushing is fixedly connected to the feeding rocker shaft to drive the feeding rocker arm bushing to swing back and forth. The top end of the rocker arm shaft is vertically mounted in the feeding rocker arm bushing, and the bottom end is rotatably connected to one side of the differential tooth fixing seat to drive the differential tooth fixing seat to swing, thereby driving the upper differential tooth to move back and forth.

[0050] like Figure 1 As shown, the drive shaft 720 can rotate around its own axis, and the drive shaft 720, the main shaft 10, and the transmission shaft 20 are all parallel to each other and spaced apart, which ensures that no interference occurs during differential adjustment. At the same time, it increases the layout freedom of the adjustment device, enabling the device to adapt to equipment with different space constraints and enhancing its applicability.

[0051] Specifically, the first crank-connecting rod mechanism 710 includes a first crank 711, a first connecting rod 712, and a second crank 713 that are hinged in sequence. The first crank 711 is fixedly connected to the output shaft 610 of the drive component 60, and the first crank 711 is hinged to the first end of the first connecting rod 712. The second crank 713 is fixedly connected to the first end of the drive shaft 720, and the second crank 713 is hinged to the second end of the first connecting rod 712. The introduction of the first crank-connecting rod mechanism 710 forms an effective angle conversion and amplification mechanism. The small angle change of the drive component 60 is transmitted through the first crank 711 and the first connecting rod 712 and finally amplified into a significant swing of the drive shaft 720 and the swing assembly 40, thereby precisely controlling the differential amount of the transmission shaft 20 and improving the sewing accuracy.

[0052] like Figure 1 , Figure 4 and Figure 5As shown, the first crank-connecting rod mechanism 710 further includes a first connecting pin 100. The first crank 711 includes a first crank fixing part 711-1 and a first crank connecting part 711-2 connected in sequence. The first crank fixing part 711-1 is provided with a first crank fixing part pin hole 711-3, and the first crank connecting part 711-2 is provided with a first crank connecting part pin hole 711-4. The first crank fixing part pin hole 711-3 is fixedly sleeved on the output shaft 610 of the drive component 60. The first connecting pin 100 is rotatably passed through the first crank connecting part pin hole 711-4 and the first end of the first connecting rod 712. The upper and / or the first crank-connecting rod mechanism 710 further includes a second connecting pin 200. The second crank 713 includes a second crank fixing part 713-1 and a second crank connecting part 713-2 connected in sequence. The second crank fixing part 713-1 is provided with a second crank fixing part pin hole 713-3, and the second crank connecting part 713-2 is provided with a second crank connecting part pin hole 713-4. The second crank fixing part pin hole 713-3 is fixedly sleeved on the first end of the drive shaft 720, and the second connecting pin 200 is rotatably passed through the second crank connecting part pin hole 713-4 and the second end of the first connecting rod 712.

[0053] By specifying the structure of the first crank 711 and the second crank 713, and using the first connecting pin 100 and the second connecting pin 200 for hinge connection, the accuracy of power transmission is ensured, the backlash and oscillation during the movement are reduced, and the precision of the adjustment process is improved. In addition, the addition of the first connecting pin 100 and the second connecting pin 200 not only strengthens the connection between the components, but also reduces the friction and wear of the connecting rod during the movement through its rotatable characteristics, thus extending the service life of the entire differential adjustment device.

[0054] Preferably, the design of the first crank connecting pin hole 711-4 with the first connecting pin 100, the second crank connecting pin hole 713-4 and the second connecting pin 200 simplifies the assembly and maintenance process of the device. Once it is necessary to replace or adjust the components in the first crank connecting rod mechanism 710, it is only necessary to remove the corresponding connecting pins, without disassembling the entire device, which greatly saves maintenance time and costs.

[0055] Preferably, the second crank-connecting rod mechanism 730 includes a third crank 731 and a second connecting rod 732. The third crank 731 is fixedly connected to the second end of the drive shaft 720, and the third crank 731 is hinged to the first end of the second connecting rod 732. The second end of the second connecting rod 732 is hinged to the swing assembly 40, forming a direct energy transmission path from the drive component 60 to the swing assembly 40. This reduces intermediate links in the energy transmission process, improves the efficiency of energy conversion and response speed, and the combination of the third crank 731 and the second connecting rod 732 makes the movement of the swing assembly 40 smoother, avoids sudden speed changes or changes in direction during the adjustment process, reduces interference with the sewing process, and ensures the continuity of the sewing work.

[0056] like Figure 1 and Figure 6 As shown, the second crank-connecting rod mechanism 730 includes a third connecting pin 300. The third crank 731 includes a third crank fixing part 731-1 and a third crank connecting part 731-2 connected in sequence. The third crank fixing part 731-1 is provided with a third crank fixing part pin hole 731-3, and the third crank connecting part 731-2 is provided with a third crank connecting part pin hole 731-4. The third crank fixing part pin hole 731-3 is fixedly sleeved on the second end of the drive shaft 720. The third connecting pin 300 is rotatably passed through the third crank connecting part pin hole 731-4 and the first end of the second connecting rod 732. The use of the third connecting pin 300 ensures the hinge stability between the third crank 731 and the second connecting rod 732, reduces the shaking and deviation during power transmission, and makes the power transmission from the drive shaft 720 to the swing assembly 40 more precise, thereby improving the adjustment accuracy of the entire differential adjustment device.

[0057] Preferably, the third connecting pin 300 makes the maintenance and adjustment of the second crank connecting rod mechanism 730 more intuitive and convenient. When it is necessary to repair or replace parts, only the third connecting pin 300 needs to be removed, without disassembling the entire device, which greatly saves maintenance time and costs.

[0058] like Figure 2 and Figure 7 As shown, the swing seat 410 includes two side plates 411 and a base plate 412. The two side plates 411 are arranged opposite each other along a predetermined axis, and the base plate 412 is disposed between the two side plates 411 to be connected to the two side plates 411 respectively, so as to form a mounting groove 420 for accommodating at least a part of the first transmission assembly 30 and at least a part of the intermediate transmission assembly 50. The design of the double side plates 411 and the base plate 412 of the swing seat 410 forms a stable frame structure, which effectively supports the partial structure of the first transmission assembly 30 and the intermediate transmission assembly 50, enhances the load-bearing capacity of the entire device, and ensures stable operation under high-intensity sewing operations.

[0059] A connecting shaft 430 has a predetermined axis. The side plate 411 furthest from the drive shaft 20 has a first side plate pin hole 411-1, a second side plate pin hole 411-2, and a third side plate pin hole 411-3 spaced apart along a predetermined direction. The side plate 411 closest to the drive shaft 20 has a second side plate pin hole 411-2 and a third side plate pin hole 411-3 spaced apart along a predetermined direction. The connecting shaft is rotatably mounted in the second side plate pin hole 411-2. The first side plate pin hole 411-1, the second side plate pin hole 411-2, and the third side plate pin hole 411-3 allow the connecting shaft 430 to have different installation positions, which provides a basis for the adjustment device. An adjustable differential ratio is provided, enhancing the adaptability and flexibility of the equipment in the face of different sewing needs. The second crank connecting rod mechanism 730 is also provided with a fourth connecting pin 400. The fourth connecting pin 400 is rotatably passed through the second end of the second connecting rod 732 and the first side plate pin hole 411-1. By precisely designing the position and spacing of the first side plate pin hole 411-1, the second side plate pin hole 411-2 and the third side plate pin hole 411-3, the hinge between the fourth connecting pin 400 and the first side plate pin hole 411-1 is made so that the swing of the swing component 40 is more controllable, enabling more delicate differential adjustment and improving the quality and consistency of sewn products.

[0060] like Figure 3 As shown, the intermediate transmission assembly 50 includes: a first swing link 510, at least a portion of which is disposed in the mounting groove 420, and the first end of the first swing link 510 is hinged to the third side plate pin hole 411-3; a second swing link 520, the first end of which is hinged to the second end of the first swing link 510 and the output end of the first transmission assembly 30; and a first swing crank 530, the first end of which is hinged to the second end of the second swing link 520, and the second end of which is fixedly connected to the transmission shaft 20. The introduction of the first swing link 510 and the second swing link 520, in conjunction with the third side plate pin hole 411-3 on the swing seat 410, enables smooth power transmission during adjustment, reducing the possible interruption or unevenness of energy transmission during high-speed operation, making the differential adjustment process smoother and improving the fluidity of the sewing process.

[0061] In one embodiment of this utility model, the intermediate transmission assembly 50 further includes a first swing linkage group, which includes two opposing first swing linkages 510. The first end of each first swing linkage 510 is hinged to each third side plate pin hole 411-3 in a one-to-one correspondence. The intermediate transmission assembly 50 also includes a second swing linkage group, which includes two opposing second swing linkages 520. The first end of each second swing linkage 520 is hinged to the second end of each first swing linkage 510 and the output end of the first transmission assembly 30. The first swing crank 530 is disposed between the two second swing linkages 520.

[0062] like Figures 1 to 3 As shown, the intermediate transmission assembly 50 further includes: a fifth connecting pin 500, which is rotatably disposed in the third side plate pin hole 411-3 and the first end of the first swing link 510; and a sixth connecting pin 600, which is rotatably disposed in the second end of the first swing link 510, the first end of the second swing link 520, and the output end of the first transmission assembly 30. The presence of the fifth connecting pin 500 and the sixth connecting pin 600 ensures the accuracy of the first swing link 510 and the second swing link 520 during swinging, reduces displacement deviation during transmission, and makes the entire differential adjustment more precise.

[0063] The intermediate transmission assembly 50 also includes a seventh connecting pin 700. The first swing crank 530 includes a first swing crank fixing part 530-1 and a first swing crank connecting part 530-2 connected in sequence. The first swing crank fixing part 530-1 is provided with a first swing crank fixing part pin hole 530-3, and the first swing crank connecting part 530-2 is provided with a first swing crank connecting part pin hole 530-4. The seventh connecting pin 700 is rotatably passed through the first swing crank connecting part pin hole 530-4 and the second end of the second swing connecting rod 520. The first swing crank fixing part pin hole 530-3 is fixedly sleeved on the transmission shaft 20. The connection between the seventh connecting pin 700 and the first swing crank 530 forms a direct energy conversion path from the connecting rod mechanism to the transmission shaft 20. This design ensures minimal energy loss during the conversion process, improves transmission efficiency, and makes the differential adjustment response rapid.

[0064] Preferably, the use of the fifth connecting pin 500, the sixth connecting pin 600 and the seventh connecting pin 700 simplifies the connection between the components, so that when maintaining or replacing the components, it is only necessary to loosen or tighten the corresponding connecting pins, without the need for complete disassembly, which reduces maintenance costs, shortens the non-working time of the equipment and improves production efficiency.

[0065] Optionally, the first transmission assembly 30 further includes an eccentric wheel 310, which is fixedly sleeved on the main shaft 10. The eccentric wheel 310 serves as the first power conversion link, converting the rotational motion of the main shaft 10 into a connecting rod motion with differential characteristics. This design makes power conversion more direct and efficient, reduces energy loss during the conversion process, and improves the overall energy utilization efficiency of the device.

[0066] The first transmission assembly 30 also includes a third swing link 320. The first end of the third swing link 320 is fixedly sleeved on the eccentric wheel 310. The second end of the third swing link 320 is hinged to the first end of the second swing link 520 and the second end of the first swing link 510. The first end of the third swing link 320 is fixed on the eccentric wheel 310, while its second end is hinged to the second swing link 520 and the first swing link 510, forming a linked differential adjustment. This enables more complex and precise differential adjustment actions, improving the flexibility and accuracy of the adjustment to adapt to different sewing needs.

[0067] This utility model also provides a sewing machine including the aforementioned differential adjustment device. Due to the adoption of precise differential adjustment technology, the sewing machine of this application can better control the tension difference between the upper and lower layers of fabric, avoiding wrinkles, twisting and misalignment. Especially when sewing complex structures such as the curved hem of a shirt and the upper sleeve of a suit, it can significantly improve the quality of the sewing product.

[0068] In this invention, the main shaft 10, transmission shaft 20, drive shaft 720, and connecting shaft 430 are all rotatably mounted on the frame of the sewing machine, and the drive component 60 is fixedly mounted on the frame of the sewing machine.

[0069] Preferably, the drive component 60 of this invention uses a stepper motor, which can precisely control the rotation angle of the output shaft 610. In the prior art, manual adjustment using a needle distance dial often requires stopping the machine. Furthermore, the scale lines on the needle distance knob typically only represent a single value, with a range between the scale lines, leading to large adjustment errors. Adjusting to the appropriate needle distance often requires considerable time, resulting in low efficiency. Therefore, the differential adjustment motor of the sewing machine in this embodiment can quickly and accurately rotate to the set angle, thereby achieving rapid and precise adjustment of the upper needle distance, simplifying the adjustment process. Moreover, by simply writing the upper needle distance adjustment parameters into the sewing program, automatic adjustment of the upper needle distance can be achieved during sewing without stopping the machine, making the adjustment process quick.

[0070] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0071] This utility model discloses a differential adjustment device, comprising: a main shaft 10, which is rotatable around its own axis and is connected to a differential tooth assembly 80 for driving the upper differential tooth of the differential tooth assembly 80 to move up and down; a transmission shaft 20, which is rotatable around its own axis and is connected to the differential tooth assembly 80 for driving the upper differential tooth of the differential tooth assembly 80 to move back and forth, the transmission shaft 20 being parallel to and spaced apart from the main shaft 10, and a first transmission component 30 being provided between the main shaft 10 and the transmission shaft 20 for driving the transmission shaft 20 to rotate; and a swing component 40, which is rotatable around a predetermined axis. The rotation is parallel to the main shaft 10; the intermediate transmission assembly 50 is hinged to the transmission shaft 20, the first transmission assembly 30 and the swing assembly 40, so as to drive the transmission shaft 20 to rotate under the drive of the first transmission assembly 30 and the swing assembly 40; the driving component 60 is provided with a second transmission assembly 70 between the driving component 60 and the swing assembly 40, the second transmission assembly 70 includes a first crank-connecting rod mechanism 710, a drive shaft 720 and a second crank-connecting rod mechanism 730 connected in sequence from the driving component 60 to the swing assembly 40, so as to drive the swing assembly 40 to rotate under the drive of the second transmission assembly 70.

[0072] Thus, this invention utilizes the second transmission assembly 70, composed of the first crank-connecting rod mechanism 710, the drive shaft 720, and the second crank-connecting rod mechanism 730, to achieve precise angle and direction control of the swing assembly 40. This precise control is further translated into accurate adjustment of the rotation of the transmission shaft 20, enabling the differential adjustment device to achieve ideal differential effects in various sewing requirements, reducing material waste and improving product quality. Through the coordinated work of the intermediate transmission assembly 50, the first transmission assembly 30, and the swing assembly 40, it can quickly respond to the signals of the drive component 60, ensuring timely differential adjustment even on a high-speed sewing machine, guaranteeing sewing results. Furthermore, through the driving capability of the drive component 60, automated dynamic adjustment can be achieved, automatically adjusting the differential amount according to real-time sewing conditions without manual intervention, greatly improving the efficiency and continuity of sewing operations. This effectively solves the problem in existing differential sewing machines where manual adjustment of the differential amount is required, leading to large adjustment errors.

[0073] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0074] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0075] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0076] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0077] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0078] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A differential control device, characterized in that, include: The main shaft (10) is rotatable around its own axis and is connected to the differential tooth assembly (80) for transmission, so as to drive the upper differential tooth of the differential tooth assembly (80) to perform lifting and lowering movements; A drive shaft (20) is rotatable around its own axis and is connected to the differential tooth assembly (80) to drive the upper differential tooth of the differential tooth assembly (80) to move back and forth. The drive shaft (20) is parallel to and spaced apart from the main shaft (10). A first transmission assembly (30) is provided between the main shaft (10) and the drive shaft (20) to drive the drive shaft (20) to rotate through the first transmission assembly (30). A swing assembly (40) is rotatable about a predetermined axis, which is parallel to the main shaft (10); An intermediate transmission assembly (50) is hinged to the transmission shaft (20), the first transmission assembly (30), and the swing assembly (40) to drive the transmission shaft (20) to rotate under the drive of the first transmission assembly (30) and the swing assembly (40). A drive component (60) is provided, and a second transmission component (70) is provided between the drive component (60) and the swing assembly (40). The second transmission component (70) includes a first crank-connecting rod mechanism (710), a drive shaft (720) and a second crank-connecting rod mechanism (730) connected sequentially from the drive component (60) to the swing assembly (40) to drive the swing assembly (40) to rotate.

2. The differential adjustment device according to claim 1, characterized in that, The drive shaft (720) is rotatable about its own axis, and the drive shaft (720), the main shaft (10), and the transmission shaft (20) are all parallel to each other and spaced apart; and / or; The first crank-connecting rod mechanism (710) includes a first crank (711), a first connecting rod (712), and a second crank (713) that are hinged in sequence. The first crank (711) is fixedly connected to the output shaft (610) of the drive component (60), and the first crank (711) is hinged to the first end of the first connecting rod (712). The second crank (713) is fixedly connected to the first end of the drive shaft (720), and the second crank (713) is hinged to the second end of the first connecting rod (712).

3. The differential adjustment device according to claim 2, characterized in that, The first crank-connecting rod mechanism (710) further includes a first connecting pin (100). The first crank (711) includes a first crank fixing part (711-1) and a first crank connecting part (711-2) connected in sequence. The first crank fixing part (711-1) is provided with a first crank fixing part pin hole (711-3), and the first crank connecting part (711-2) is provided with a first crank connecting part pin hole (711-4). The first crank fixing part pin hole (711-3) is fixedly sleeved on the output shaft (610) of the drive component (60). The first connecting pin (100) is rotatably passed through the first crank connecting part pin hole (711-4) and the first end of the first connecting rod (712); and / or The first crank-connecting rod mechanism (710) further includes a second connecting pin (200). The second crank (713) includes a second crank fixing part (713-1) and a second crank connecting part (713-2) connected in sequence. The second crank fixing part (713-1) is provided with a second crank fixing part pin hole (713-3). The second crank connecting part (713-2) is provided with a second crank connecting part pin hole (713-4). The second crank fixing part pin hole (713-3) is fixedly sleeved on the first end of the drive shaft (720). The second connecting pin (200) is rotatably passed through the second crank connecting part pin hole (713-4) and the second end of the first connecting rod (712).

4. The differential adjustment device according to claim 2, characterized in that, The second crank-connecting rod mechanism (730) includes a third crank (731) and a second connecting rod (732). The third crank (731) is fixedly connected to the second end of the drive shaft (720), and the third crank (731) is hinged to the first end of the second connecting rod (732). The second end of the second connecting rod (732) is hinged to the swing assembly (40).

5. The differential adjustment device according to claim 4, characterized in that, The second crank-connecting rod mechanism (730) includes a third connecting pin (300). The third crank (731) includes a third crank fixing part (731-1) and a third crank connecting part (731-2) connected in sequence. The third crank fixing part (731-1) is provided with a third crank fixing part pin hole (731-3). The third crank connecting part (731-2) is provided with a third crank connecting part pin hole (731-4). The third crank fixing part pin hole (731-3) is fixedly sleeved on the second end of the drive shaft (720). The third connecting pin (300) is rotatably passed through the third crank connecting part pin hole (731-4) and the first end of the second connecting rod (732).

6. The differential adjustment device according to claim 4, characterized in that, The swing assembly (40) also includes: A swing seat (410) includes two side plates (411) and a base plate (412). The two side plates (411) are arranged opposite to each other along the predetermined axis. The base plate (412) is disposed between the two side plates (411) and connected to the two side plates (411) respectively to form a mounting groove (420) for accommodating at least a portion of the first transmission assembly (30) and at least a portion of the intermediate transmission assembly (50). A connecting shaft (430), wherein the predetermined axis is the axis of the connecting shaft (430); The side plate (411) away from the drive shaft (20) is provided with a first side plate pin hole (411-1), a second side plate pin hole (411-2) and a third side plate pin hole (411-3) arranged sequentially and spaced apart along a predetermined direction. The side plate (411) close to the drive shaft (20) is provided with a second side plate pin hole (411-2) and a third side plate pin hole (411-3) arranged sequentially and spaced apart along a predetermined direction. The connecting shaft is rotatably passed through the second side plate pin hole (411-2). The second crank connecting rod mechanism (730) is also provided with a fourth connecting pin (400). The fourth connecting pin (400) is rotatably passed through the second end of the second connecting rod (732) and the first side plate pin hole (411-1).

7. The differential adjustment device according to claim 6, characterized in that, The intermediate transmission assembly (50) includes: A first swing link (510) is provided in the mounting groove (420) at least part of which is hinged to the third side plate pin hole (411-3). The second swing link (520) is hinged at its first end to the second end of the first swing link (510) and the output end of the first transmission assembly (30). A first swing crank (530) is provided, the first end of which is hinged to the second end of the second swing connecting rod (520), and the second end of which is fixedly connected to the drive shaft (20).

8. The differential adjustment device according to claim 7, characterized in that, The intermediate transmission assembly (50) also includes: The fifth connecting pin (500) is rotatably disposed in the third side plate pin hole (411-3) and the first end of the first swing link (510); A sixth connecting pin (600) is rotatably disposed on the second end of the first swing link (510), the first end of the second swing link (520), and the output end of the first transmission assembly (30); and The seventh connecting pin (700) is provided. The first swing crank (530) includes a first swing crank fixing part (530-1) and a first swing crank connecting part (530-2) connected in sequence. The first swing crank fixing part (530-1) is provided with a first swing crank fixing part pin hole (530-3), and the first swing crank connecting part (530-2) is provided with a first swing crank connecting part pin hole (530-4). The seventh connecting pin (700) is rotatably passed through the first swing crank connecting part pin hole (530-4) and the second end of the second swing connecting rod (520). The first swing crank fixing part pin hole (530-3) is fixedly sleeved on the transmission shaft (20).

9. The differential adjustment device according to claim 7, characterized in that, The first transmission assembly (30) further includes: An eccentric wheel (310) is fixedly sleeved on the main shaft (10); The third swing link (320) has its first end fixedly sleeved on the eccentric wheel (310), and its second end is hinged to the first end of the second swing link (520) and the second end of the first swing link (510).

10. A sewing machine, characterized in that, Includes the differential adjustment device according to any one of claims 1-9.

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