Sewing machine adjusting device

Abstract

The application relates to the technical field of sewing machines, in particular to a sewing machine adjusting device. The sewing machine adjusting device comprises a driving mechanism, a tooth adjusting mechanism, a differential ratio adjusting mechanism and a stitch length adjusting mechanism. The driving mechanism comprises a driving piece and a rotating shaft. The tooth adjusting mechanism comprises a tooth adjusting cam and a feed dog linkage unit. The differential ratio adjusting mechanism comprises a differential ratio cam and a differential ratio adjusting unit. The stitch length adjusting mechanism comprises a stitch length cam, a stitch length needle shaft and a stitch length adjusting unit. The tooth adjusting cam, the differential ratio cam and the stitch length cam are all fixed to the rotating shaft. The application simultaneously satisfies the data adjustment of the tooth height, the differential ratio and the stitch length by setting a single driving mechanism, simplifies the stitch length adjusting mechanism, improves the adjusting efficiency, saves the production cost of the whole machine and reduces the volume of the whole machine.

Description

Technical Field

[0001] This application relates to the field of sewing machine technology, and in particular to a sewing machine adjustment device. Background Technology

[0002] Sewing machines are mainly used as mechanical devices for sewing together materials such as fabrics and leather. To meet the different sewing needs of different fabrics, it is necessary to adjust the structure so that the sewing machine has different stitch lengths, differential ratios, and tooth heights.

[0003] Existing sewing machine adjustment devices typically employ multiple motors or power sources to drive adjustments for stitch length, differential ratio, and tooth height, respectively. These devices are complex in structure, bulky, and have low automation. Furthermore, they are cumbersome to operate, inefficient in adjustment, and cannot quickly adjust to the user's desired state, thus affecting usability. Utility Model Content

[0004] Therefore, it is necessary to provide a sewing machine adjustment device that can simultaneously achieve stitch length, differential ratio, and fork tooth height through a simple structure, thereby reducing the overall machine volume and improving the degree of automation and adjustment efficiency.

[0005] To solve the above-mentioned technical problems, this application provides the following technical solution:

[0006] A sewing machine adjustment device for adjusting the stitch length, differential ratio, and tooth height of a sewing machine, the sewing machine adjustment device comprising:

[0007] A drive mechanism includes a drive component and a rotating shaft. The rotating shaft is connected to the drive component and, along the circumferential direction of the rotating shaft, a tooth adjustment angle area, a differential ratio adjustment angle area, and a pin pitch adjustment angle area are sequentially arranged on the rotating shaft.

[0008] The tooth adjustment mechanism includes a tooth adjustment cam and a tooth feeding linkage unit. The tooth adjustment cam is fixed to the rotating shaft and has a first protrusion. The first protrusion corresponds to the tooth adjustment angle area, and as the rotating shaft rotates, the first protrusion is linked with the tooth feeding linkage unit in the tooth adjustment angle area.

[0009] A differential ratio adjustment mechanism includes a differential ratio cam and a differential ratio adjustment unit. The differential ratio cam is fixed to the rotating shaft and has a second protrusion. The second protrusion corresponds to the differential ratio adjustment angle region, and as the rotating shaft rotates, the second protrusion is linked with the differential ratio adjustment unit in the differential ratio adjustment angle region.

[0010] A stitch length adjustment mechanism includes a stitch length cam, a stitch length opening shaft, and a stitch length adjustment unit. The stitch length cam is fixed to the rotating shaft and has a third protrusion corresponding to the stitch length adjustment angle area. The stitch length adjustment unit has an opening groove. One end of the stitch length opening shaft engages with the third protrusion, and the other end engages with the opening groove. As the rotating shaft rotates, the third protrusion engages with the stitch length opening shaft in the stitch length adjustment angle area, driving the stitch length opening shaft to extend into the opening groove, thereby controlling the operation of the stitch length adjustment unit.

[0011] It is understood that this application, by setting a drive mechanism, sequentially sets an adjustment angle zone, a differential ratio adjustment angle zone, and a stitch length adjustment angle zone on the rotating shaft of the drive mechanism. Combined with the adjustment mechanism, differential ratio adjustment mechanism, and stitch length adjustment mechanism, when the rotating shaft rotates to the corresponding angle zone, the tooth height, differential ratio, or stitch length can be adjusted accordingly. That is, by setting a single drive mechanism, the data adjustment of tooth height, differential ratio, and stitch length can be satisfied simultaneously, and the adjustment of the three data does not affect each other, improving the automation level of the sewing machine adjustment device. Moreover, the setting structure of adjusting the corresponding data by rotating the shaft is relatively simple and can improve the adjustment efficiency. At the same time, in the stitch length adjustment mechanism, when the rotating shaft rotates to the stitch length adjustment angle zone, the third protrusion can directly cooperate with the stitch length opening shaft to realize the control of the action of the stitch length adjustment unit. That is, through the direct cooperation between the stitch length cam and the stitch length opening shaft, the stitch length can be adjusted without the need for intermediate structure conversion, simplifying the sewing machine adjustment device and saving costs and the size of the whole machine.

[0012] In one embodiment, the needle spacing adjustment unit includes a needle opening cam, a pawl, a needle adjusting shaft, and an adjusting eccentric wheel. The needle opening cam is fixed to the needle adjusting shaft, and one side of the needle opening cam is connected to the adjusting eccentric wheel and the other side is connected to the pawl in the axial direction of the needle adjusting shaft.

[0013] The third protrusion can push the needle spacing opening shaft in the needle spacing adjustment angle area, so that the needle spacing opening shaft extends into the needle opening groove and separates the pawl from the needle opening cam, thereby driving the needle adjustment shaft to rotate and adjust the needle spacing.

[0014] Understandably, with this setup, the needle pitch adjustment can be completed through two actions: rotating the shaft to extend the needle pitch opening shaft into the opening slot and rotating the needle adjustment shaft. In other words, through simple structural settings and driving actions, the needle pitch can be adjusted without affecting the tooth height and differential ratio, which improves the automation efficiency of needle pitch adjustment and reduces the structural complexity of the needle pitch adjustment mechanism, thereby reducing the cost of structural setup and the volume occupied by the structure.

[0015] In one embodiment, the needle spacing adjustment mechanism further includes an elastic element and a movable block. The elastic element is wound around the needle spacing opening shaft, and the end of the elastic element away from the opening groove is connected to the needle spacing opening shaft, while the end of the elastic element close to the needle spacing opening shaft is connected to the movable block.

[0016] When the needle spacing opening shaft extends into the needle opening groove, the movable block abuts against the needle opening cam and compresses the elastic element, so that the needle spacing opening shaft has a tendency to return to its original position.

[0017] Understandably, the elastic element allows the stitch length adjustment mechanism to automatically return to its initial position after the stitch length adjustment is completed, enabling the stitch length opening shaft to disengage from the opening slot and reset to the position where the stitch length cam can push the stitch length opening shaft. This facilitates the stitch length adjustment mechanism to automatically reset to its initial position for the next stitch length adjustment. Furthermore, the movable block compresses the elastic element when the stitch length opening shaft extends into the opening slot, giving the stitch length opening shaft a tendency to reset. This prevents the stitch length opening shaft from getting stuck in the opening slot and being unable to reset, thus preventing the stitch length from being adjusted again. This further improves the automation level of the sewing machine's adjustment device.

[0018] In one embodiment, the feed dog linkage unit includes a one-way transmission component and a feed dog control linkage. One end of the one-way transmission component is movably connected to the dog adjusting cam, and the other end is fixed to the feed dog control linkage.

[0019] When the rotating shaft rotates back and forth in the tooth adjustment angle zone, the tooth adjustment cam is linked to the one-way transmission component, which in turn drives the feed tooth control linkage to move, thereby adjusting the tooth height.

[0020] Understandably, by setting up a one-way transmission component and a feed dog control linkage, the height of the feed dog can be adjusted by rotating the shaft back and forth in the feed dog angle zone. This allows the feed dog height adjustment in the sewing machine adjustment device to be matched with the adjustment of the stitch length and differential ratio, enabling the simultaneous adjustment of three sewing machine data through a single power source.

[0021] In one embodiment, in the circumferential direction of the tooth adjusting cam, the first protrusion has a first segment and a second segment connected to each other, the cross-sectional radius of the first segment being smaller than the cross-sectional diameter of the second segment;

[0022] When the rotating shaft rotates back and forth in the tooth adjustment angle zone, the one-way transmission component switches contact between the first segment and the second segment to drive the feed tooth control linkage to move and adjust the tooth height.

[0023] In one embodiment, the one-way transmission assembly includes an adjusting crank, a first eccentric shaft, a one-way actuator, and a ball joint. The adjusting crank abuts against the tooth adjusting cam and is connected to one end of the ball joint via the first eccentric shaft. The one-way actuator is located on the first eccentric shaft to control the one-way movement of the first eccentric shaft. The other end of the ball joint is connected to the feed tooth control linkage.

[0024] It is understandable that by setting up the one-way device, the first eccentric axis can be controlled to rotate in one direction, so that the tooth height can be adjusted by rotating the shaft back and forth in the tooth adjustment angle area. In this way, the ratio of the tooth adjustment angle area to the rotatable angle of the shaft is reduced, which makes it easier to set up the differential ratio angle area and the pin distance angle area.

[0025] In one embodiment, the unidirectional transmission assembly further includes a second eccentric shaft, and the ball joint is connected to the feed tooth control joint via the second eccentric shaft.

[0026] Understandably, the addition of a second eccentric shaft increases the range of motion of the feed dog control linkage, thereby increasing the range of tooth height adjustment and expanding the applicability of the sewing machine adjustment device to meet users' needs for different tooth heights.

[0027] In one embodiment, the differential ratio adjustment unit includes a differential connecting rod, a slider assembly, and a feed crank. One end of the differential connecting rod is connected to the peripheral side of the second convex portion of the differential ratio cam, and the other end is connected to the slider assembly. The slider assembly is movably connected to the feed crank.

[0028] The second protrusion rotates with the shaft, causing the differential connecting rod to drive the slider assembly to slide on the feed crank to adjust the differential ratio.

[0029] In one embodiment, the slider assembly includes a differential eccentric crank, a differential crank, a differential connecting plate, and a slider. The differential eccentric crank is fixed to the differential connecting rod and connected to one end of the differential crank. The other end of the differential crank is connected to the differential connecting plate. The slider is connected to the differential connecting plate and has a movable groove. The feeding crank passes through the movable groove.

[0030] In one embodiment, the rotation angle of the rotating shaft also has a clearance area, which is located between the tooth adjustment angle area and the needle pitch adjustment angle area to accommodate the installation of the differential ratio adjustment mechanism, the tooth adjustment mechanism and the needle pitch adjustment mechanism.

[0031] Compared with existing technologies, the sewing machine adjustment device described above, by setting up a drive mechanism, sequentially sets an adjustment angle zone, a differential ratio adjustment angle zone, and a stitch length adjustment angle zone on the rotating shaft of the drive mechanism. Combined with the adjustment mechanism, differential ratio adjustment mechanism, and stitch length adjustment mechanism, when the rotating shaft rotates to the corresponding angle zone, the tooth height, differential ratio, or stitch length can be adjusted accordingly. That is, by setting up a single drive mechanism, the data adjustment of tooth height, differential ratio, and stitch length can be satisfied simultaneously, and the adjustment of these three data points does not affect each other, improving the automation level of the sewing machine adjustment device. Furthermore, the setting structure of adjusting corresponding data by rotating the shaft is relatively simple, improving adjustment efficiency. In addition, in the stitch length adjustment mechanism, when the rotating shaft rotates to the stitch length adjustment angle zone, the third protrusion can directly cooperate with the stitch length opening shaft to control the action of the stitch length adjustment unit. That is, through the direct cooperation between the stitch length cam and the stitch length opening shaft, the stitch length adjustment can be achieved without the need for intermediate transition structures, simplifying the sewing machine adjustment device and saving costs and overall machine size. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of the sewing machine adjustment device provided in this application.

[0034] Figure 2 This is a schematic diagram illustrating the structure of the tooth adjustment angle area, differential ratio adjustment angle area, pin pitch adjustment angle area, and wheel gap area on the rotating shaft provided in this application.

[0035] Figure 3 This is a schematic diagram of a portion of the structure of the sewing machine adjustment device provided in this application, near the tooth adjustment mechanism.

[0036] Figure 4 This is a side view of the tooth-adjusting mechanism provided in this application.

[0037] Figure 5 This is a partial structural diagram of the sewing machine adjustment device provided in this application, near the differential ratio adjustment mechanism.

[0038] Figure 6 This is a partial structural diagram of the sewing machine adjustment device provided in this application, near the stitch length adjustment mechanism.

[0039] The component labels are as follows:

[0040] 100. Sewing machine adjusting device; 10. Drive mechanism; 11. Drive component; 12. Rotating shaft; 121. Tooth adjustment angle zone; 122. Differential ratio adjustment angle zone; 123. Needle pitch adjustment angle zone; 124. Wheel gap zone; 20. Tooth adjustment mechanism; 21. Tooth adjustment cam; 211. First convex part; 2111. First section; 2112. Second section; 22. Feed dog linkage unit; 221. One-way transmission assembly; 2211. Adjusting crank; 2212. First eccentric shaft; 2213. One-way actuator; 2214. Ball joint; 2215. Second eccentric shaft; 222. Feed dog control linkage; 30. Differential ratio adjustment mechanism 31. Differential ratio cam; 311. Second convex part; 32. Differential ratio adjustment unit; 321. Differential connecting rod; 322. Slider assembly; 3221. Differential eccentric crank; 3222. Differential crank; 3223. Differential connecting plate; 3224. Slider; 323. Feeding crank; 40. Stitch pitch adjustment mechanism; 41. Stitch pitch cam; 411. Third convex part; 42. Stitch pitch opening shaft; 43. Stitch pitch adjustment unit; 431. Opening groove; 432. Opening cam; 433. Pawl; 434. Adjusting shaft; 435. Adjusting eccentric wheel; 436. Elastic element; 437. Moving block; 50. Sensor; 60. Magnet. Detailed Implementation

[0041] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0042] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0044] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0046] Please see Figures 1 to 6 This application provides a sewing machine adjustment device 100, which is mainly used to adjust the stitch length, differential ratio, and tooth height of the sewing machine. Through structural simplification and single power source drive, it realizes the adjustment of the three data of stitch length, differential ratio, and tooth height of the sewing machine, thereby reducing the overall volume of the sewing machine and improving the degree of automation and adjustment efficiency, so as to quickly adjust to the state required by the user and facilitate use.

[0047] Specifically, the sewing machine adjustment device 100 includes a drive mechanism 10, a tooth adjustment mechanism 20, a differential ratio adjustment mechanism 30, and a stitch length adjustment mechanism 40. The drive mechanism 10 includes a drive component 11 and a rotating shaft 12. The rotating shaft 12 is connected to the drive component 11, and along the circumferential direction of the rotating shaft 12, a tooth adjustment angle area 121, a differential ratio adjustment angle area 122, and a stitch length adjustment angle area 123 are sequentially arranged on the rotating shaft 12. The tooth adjustment mechanism 20 includes a tooth adjustment cam 21 and a feed dog linkage unit 22. The tooth adjustment cam 21 is fixed to the rotating shaft 12 and has a first protrusion 211. The first protrusion 211 corresponds to the tooth adjustment angle area 121, and as the rotating shaft 12 rotates, the first protrusion 211 is linked with the feed dog linkage unit 22 in the tooth adjustment angle area 121. The differential ratio adjustment mechanism 30 includes a differential ratio cam 31 and a differential ratio adjustment unit 32. The differential ratio cam 31 is fixed to the rotating shaft 12 and has a first protrusion 211. The first protrusion 211 corresponds to the tooth adjustment angle area 121, and as the rotating shaft 12 rotates, the first protrusion 211 is linked with the feed dog linkage unit 22 in the tooth adjustment angle area 121. The needle spacing adjustment mechanism 40 includes a needle spacing cam 41, a needle spacing opening shaft 42, and a needle spacing adjustment unit 43. The needle spacing cam 41 is fixed to the rotating shaft 12 and has a third protrusion 411, which corresponds to the needle spacing angle adjustment area 123. The needle spacing adjustment unit 43 has an opening groove 431. One end of the needle spacing opening shaft 42 cooperates with the third protrusion 411, and the other end cooperates with the opening groove 431. As the rotating shaft 12 rotates, the third protrusion 411 cooperates with the needle spacing opening shaft 42 in the needle spacing angle adjustment area 123 and drives the needle spacing opening shaft 42 to extend into the opening groove 431 to control the operation of the needle spacing adjustment unit 43.

[0048] It should be explained that existing adjustment devices for adjusting stitch length, differential ratio, and tooth height in sewing machines mostly use multiple power sources, each corresponding to a specific adjustment. This is cumbersome, bulky, and has a low degree of automation. Repeated adjustments are required, resulting in low efficiency. Furthermore, some adjustment devices that use a single power source to adjust multiple sewing machine data have complex structures, requiring multiple transmission mechanisms and increasing costs. In contrast, this application sets up a drive mechanism 10, with tooth height adjustment angle zone 121, differential ratio adjustment angle zone 122, and stitch length adjustment angle zone 123 sequentially arranged on the rotating shaft 12 of the drive mechanism 10. Combined with the tooth height adjustment mechanism 20, differential ratio adjustment mechanism 30, and stitch length adjustment mechanism 40, when the rotating shaft 12 rotates to the corresponding angle zone, the tooth height, differential ratio, or stitch length can be adjusted accordingly. Thus, by setting a single drive mechanism 10, the data adjustment of the sewing machine's tooth height, differential ratio, and stitch length can be satisfied simultaneously, and the adjustment of the three data can be carried out in corresponding zones, so that the adjustment of the three data does not affect each other, thereby improving the automation level of the sewing machine adjustment device 100. Moreover, the setting structure of adjusting the corresponding data by rotating the shaft 12 is relatively simple and can improve the adjustment efficiency. At the same time, in the stitch length adjustment mechanism 40, when the shaft 12 rotates to the stitch length adjustment angle zone 123, it can directly cooperate with the stitch length opening shaft 42 through the third protrusion 411 to realize the control of the action of the stitch length adjustment unit 43, which simplifies its transmission structure and transmission process, reduces the overall machine cost, that is, by directly cooperating with the stitch length cam 41 and the stitch length opening shaft 42, the stitch length can be adjusted without the need for other intermediate structure conversion, which simplifies the sewing machine adjustment device 100, saves costs and the size of the whole machine, and improves the user experience.

[0049] Please refer to Figure 2 In this application, on the rotating shaft 12, the angle area between A and B is the pin pitch adjustment angle area 123, the angle area between B and C is the differential ratio adjustment angle area 122, and the angle area between C and D is the tooth adjustment angle area 121.

[0050] Here, the drive component 11 can be set as a servo motor, stepper motor, or other drive motor. Of course, it is not limited to this; the drive component 11 can also be set as other drive motors capable of driving the shaft to rotate, depending on the actual situation.

[0051] In this embodiment, the rotation angle of the rotating shaft 12 also has a wheel gap 124, which is located between the tooth adjustment angle area 121 and the needle pitch adjustment angle area 123 to accommodate the installation of the differential ratio adjustment mechanism 30, the tooth adjustment mechanism 20 and the needle pitch adjustment mechanism 40.

[0052] like Figures 1 to 4As shown, in the circumferential direction of the tooth adjustment cam 21, the first protrusion 211 has a first segment 2111 and a second segment 2112 connected to each other. The cross-sectional radius of the first segment 2111 is smaller than the cross-sectional diameter of the second segment 2112. When the rotating shaft 12 rotates back and forth in the tooth adjustment angle zone 121, the tooth feeding linkage unit 22 switches contact between the first segment 2111 and the second segment 2112 to adjust the tooth height.

[0053] Specifically, the feed dog linkage unit 22 includes a one-way transmission component 221 and a feed dog control linkage 222. One end of the one-way transmission component 221 is movably connected to the dog adjustment cam 21, and the other end is fixed to the feed dog control linkage 222. When the rotating shaft 12 rotates back and forth in the dog adjustment angle zone 121, the dog adjustment cam 21 is linked to the one-way transmission component 221, causing the one-way transmission component 221 to drive the feed dog control linkage 222 to move, thereby realizing the adjustment of the dog height. In this way, the purpose of adjusting the dog height by rotating the rotating shaft 12 back and forth in the dog adjustment angle zone 121 is achieved, so that the dog height adjustment in the sewing machine adjustment device 100 is adapted to the adjustment of the stitch length and differential ratio, realizing the simultaneous adjustment of three sewing machine data through a single power source.

[0054] Furthermore, the one-way transmission assembly 221 includes an adjusting crank 2211, a first eccentric shaft 2212, a one-way actuator 2213, and a ball joint 2214. The adjusting crank 2211 abuts against the tooth adjusting cam 21 and is connected to one end of the ball joint 2214 via the first eccentric shaft 2212. The one-way actuator 2213 is located on the first eccentric shaft 2212 to control the one-way movement of the first eccentric shaft 2212. The other end of the ball joint 2214 is connected to the feed tooth control linkage 222. Thus, the one-way device 2213 can control the first eccentric shaft 2212 to always move in the same direction, thereby enabling the shaft 12 to rotate back and forth in the tooth adjustment angle zone 121. This allows the first eccentric shaft 2212 to be unidirectionally transmitted to the feed tooth control link 222 via the ball joint 2214, thereby achieving tooth height adjustment. Furthermore, this configuration reduces the ratio of the tooth adjustment angle zone 121 to the rotatable angle of the shaft 12, making it easier to set up the differential ratio adjustment angle zone 122 and the needle distance adjustment angle zone 123.

[0055] In one embodiment, the one-way transmission assembly 221 further includes a second eccentric shaft 2215, through which the ball joint 2214 is connected to the feed dog control link 222. It is understood that the second eccentric shaft 2215 increases the range of motion of the feed dog control link 222, thereby increasing the adjustment range of the feed dog height and expanding the applicability of the sewing machine adjustment device 100, thus meeting the user's needs for different feed dog heights.

[0056] like Figure 1 and Figure 5As shown, the differential ratio adjustment unit 32 includes a differential connecting rod 321, a slider assembly 322, and a feeding crank 323. One end of the differential connecting rod 321 is connected to the peripheral side of the second protrusion 311 of the differential ratio cam 31, and the other end is connected to the slider assembly 322. The slider assembly 322 is movably connected to the feeding crank 323. The second protrusion 311 rotates with the rotating shaft, causing the differential connecting rod 321 to drive the slider assembly 322 to slide on the feeding crank 323 to adjust the differential ratio.

[0057] Furthermore, the slider assembly 322 includes a differential eccentric crank 3221, a differential crank 3222, a differential connecting plate 3223, and a slider 3224. The differential eccentric crank 3221 is fixed to the differential connecting rod 321 and connected to one end of the differential crank 3222. The other end of the differential crank 3222 is connected to the differential connecting plate 3223. The slider 3224 is connected to the differential connecting plate 3223, and the slider 3224 has a movable groove (not shown in the figure). The feeding crank 323 passes through the movable groove.

[0058] like Figure 1 and Figure 6 As shown, the stitch length adjustment unit 43 includes a needle opening cam 432, a pawl 433, a needle adjusting shaft 434, and an adjusting eccentric wheel 435. The needle opening cam 432 is fixed to the needle adjusting shaft 434, and one side of the needle opening cam 432 is connected to the adjusting eccentric wheel 435 and the other side is connected to the pawl 433 in the axial direction of the needle adjusting shaft 434. The third protrusion 411 can push the needle length opening shaft 42 in the needle length adjustment angle area 123, so that the needle length opening shaft 42 extends into the needle opening groove 431 and separates the pawl 433 from the needle opening cam 432, so as to drive the needle adjusting shaft 434 to rotate and realize the stitch length adjustment. With this configuration, the needle pitch adjustment can be completed in two steps: the rotation of the rotating shaft 12 causes the needle pitch opening shaft 42 to extend into the opening groove 431, and the rotation of the adjusting shaft 434. In other words, through a simple structural design and driving action, the needle pitch can be adjusted without affecting the tooth height and differential ratio, which improves the automation efficiency of needle pitch adjustment and reduces the structural complexity of the needle pitch adjustment mechanism 40, thereby reducing the cost of structural design and the volume occupied by the structure.

[0059] Furthermore, the stitch spacing adjustment mechanism 40 also includes an elastic element 436 and a movable block 437. The elastic element 436 is wound around the stitch spacing opening shaft 42, and one end of the elastic element 436 far away from the needle groove 431 is connected to the stitch spacing opening shaft 42, while the other end close to the stitch spacing opening shaft 42 is connected to the movable block 437. When the stitch spacing opening shaft 42 extends into the opening groove 431, the movable block 437 abuts against the opening cam 432 and compresses the elastic element 436, so that the stitch spacing opening shaft 42 has a tendency to return to its original position. Thus, after the stitch length adjustment is completed, the elastic element 436 drives the stitch length opening shaft 42 to disengage from the opening groove 431 and return to the position where the stitch length cam 41 can push the stitch length opening shaft 42. This facilitates the automatic return of the stitch length adjustment mechanism 40 to the initial position for the next stitch length adjustment. Furthermore, the movable block 437 can compress the elastic element 436 when the stitch length opening shaft 42 extends into the opening groove 431, giving the stitch length opening shaft 42 a tendency to return to its original position. This prevents the stitch length opening shaft 42 from getting stuck in the opening groove 431 and being unable to return to its original position, thus preventing the stitch length from being unable to be adjusted again. This further improves the automation level of the sewing machine adjustment device 100.

[0060] In this embodiment, the sewing machine adjustment device 100 further includes a sensor 50 and a magnet 60. The sensor 50 is disposed on the side of the drive member 11 facing the tooth adjustment mechanism 20, and the magnet 60 is disposed on the side of the tooth adjustment mechanism 20 facing the drive member 11. When the tooth height is at the lowest point, the magnet 60 can just contact the sensor 50 to control the sewing machine adjustment device 100 to achieve zero-position calibration reset.

[0061] The working principle of the sewing machine adjustment device in this application is as follows:

[0062] When tooth height needs to be adjusted, the control drive 11 drives the rotating shaft 12 to rotate back and forth in the tooth angle adjustment zone 121, so as to drive the tooth adjustment cam 21 to rotate back and forth between the first section 2111 and the second section 2112 through the adjustment crank 2211. At this time, through the action of the one-way device 2213, the first eccentric shaft 2212 rotates in the same direction and is transmitted to the second eccentric shaft 2215 through the ball joint 2214, so that the second eccentric shaft 2215 rotates and drives the tooth feeding control link 222 to move, thereby realizing the adjustment of tooth height.

[0063] When the differential ratio needs to be adjusted, the control drive 11 drives the rotating shaft 12 to rotate to the differential ratio adjustment angle zone 122, and continues to rotate in the differential ratio adjustment angle zone 122, so that the differential ratio cam 31 drives the differential eccentric crank 3221 to move through the differential connecting rod 321 connected to it. The differential eccentric crank 3221 transmits the differential eccentric crank 3221 and the differential connecting plate 3223 in sequence, so that the differential connecting plate 3223 can drive the slider 3224 to slide on the feeding crank 323, thereby realizing the adjustment of the differential ratio.

[0064] When the stitch length needs to be adjusted, the control drive 11 drives the rotating shaft 12 to rotate to the stitch length adjustment angle zone 123, and continues to rotate in the stitch length adjustment angle zone 123 to drive the stitch length cam 41 to rotate to the third protrusion 411 to push the stitch length opening shaft 42 into the opening groove 431, and to separate the pawl 433 from the opening cam 432. After that, the adjustment shaft 434 can be controlled to rotate, thereby realizing the adjustment of the stitch length.

[0065] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A sewing machine adjustment device for adjusting the stitch length, differential ratio, and tooth height of a sewing machine, characterized in that, The sewing machine adjustment device includes: A drive mechanism includes a drive component and a rotating shaft. The rotating shaft is connected to the drive component and, along the circumferential direction of the rotating shaft, a tooth adjustment angle area, a differential ratio adjustment angle area, and a pin pitch adjustment angle area are sequentially arranged on the rotating shaft. The tooth adjustment mechanism includes a tooth adjustment cam and a tooth feeding linkage unit. The tooth adjustment cam is fixed to the rotating shaft and has a first protrusion. The first protrusion corresponds to the tooth adjustment angle area, and as the rotating shaft rotates, the first protrusion is linked with the tooth feeding linkage unit in the tooth adjustment angle area. A differential ratio adjustment mechanism includes a differential ratio cam and a differential ratio adjustment unit. The differential ratio cam is fixed to the rotating shaft and has a second protrusion. The second protrusion corresponds to the differential ratio adjustment angle region, and as the rotating shaft rotates, the second protrusion is linked with the differential ratio adjustment unit in the differential ratio adjustment angle region. A stitch length adjustment mechanism includes a stitch length cam, a stitch length opening shaft, and a stitch length adjustment unit. The stitch length cam is fixed to the rotating shaft and has a third protrusion corresponding to the stitch length adjustment angle area. The stitch length adjustment unit has an opening groove. One end of the stitch length opening shaft engages with the third protrusion, and the other end engages with the opening groove. As the rotating shaft rotates, the third protrusion engages with the stitch length opening shaft in the stitch length adjustment angle area, driving the stitch length opening shaft to extend into the opening groove, thereby controlling the operation of the stitch length adjustment unit.

2. The sewing machine adjusting device according to claim 1, characterized in that, The stitch length adjustment unit includes a needle opening cam, a pawl, a needle adjusting shaft, and an adjusting eccentric wheel. The needle opening cam is fixed to the needle adjusting shaft, and one side of the needle opening cam is connected to the adjusting eccentric wheel and the other side is connected to the pawl along the axial direction of the needle adjusting shaft. The third protrusion can push the needle spacing opening shaft in the needle spacing adjustment angle area, so that the needle spacing opening shaft extends into the needle opening groove and separates the pawl from the needle opening cam, thereby driving the needle adjustment shaft to rotate and adjust the needle spacing.

3. The sewing machine adjusting device according to claim 2, characterized in that, The needle spacing adjustment mechanism further includes an elastic element and a movable block. The elastic element is wound around the needle spacing opening shaft, and the end of the elastic element away from the opening groove is connected to the needle spacing opening shaft, while the end of the elastic element close to the needle spacing opening shaft is connected to the movable block. When the needle spacing opening shaft extends into the needle opening groove, the movable block abuts against the needle opening cam and compresses the elastic element, so that the needle spacing opening shaft has a tendency to return to its original position.

4. The sewing machine adjusting device according to claim 1, characterized in that, The feed dog linkage unit includes a one-way transmission component and a feed dog control linkage. One end of the one-way transmission component is movably connected to the dog adjustment cam, and the other end is fixed to the feed dog control linkage. When the rotating shaft rotates back and forth in the tooth adjustment angle zone, the tooth adjustment cam is linked to the one-way transmission component, which in turn drives the feed tooth control linkage to move, thereby adjusting the tooth height.

5. The sewing machine adjusting device according to claim 4, characterized in that, In the circumferential direction of the tooth adjusting cam, the first protrusion has a first segment and a second segment connected to each other, and the cross-sectional radius of the first segment is smaller than the cross-sectional diameter of the second segment. When the rotating shaft rotates back and forth in the tooth adjustment angle zone, the one-way transmission component switches contact between the first segment and the second segment to drive the feed tooth control linkage to move and adjust the tooth height.

6. The sewing machine adjusting device according to claim 5, characterized in that, The one-way transmission assembly includes an adjusting crank, a first eccentric shaft, a one-way actuator, and a ball joint. The adjusting crank abuts against the tooth adjusting cam and is connected to one end of the ball joint via the first eccentric shaft. The one-way actuator is located on the first eccentric shaft to control the one-way movement of the first eccentric shaft. The other end of the ball joint is connected to the feed tooth control linkage.

7. The sewing machine adjusting device according to claim 6, characterized in that, The unidirectional transmission assembly also includes a second eccentric shaft, and the ball joint is connected to the feed tooth control joint via the second eccentric shaft.

8. The sewing machine adjusting device according to claim 1, characterized in that, The differential ratio adjustment unit includes a differential connecting rod, a slider assembly, and a feeding crank. One end of the differential connecting rod is connected to the peripheral side of the second convex portion of the differential ratio cam, and the other end is connected to the slider assembly. The slider assembly is movably connected to the feeding crank. The second protrusion rotates with the shaft, causing the differential connecting rod to drive the slider assembly to slide on the feed crank to adjust the differential ratio.

9. The sewing machine adjusting device according to claim 8, characterized in that, The slider assembly includes a differential eccentric crank, a differential crank, a differential connecting plate, and a slider. The differential eccentric crank is fixed to the differential connecting rod and connected to one end of the differential crank. The other end of the differential crank is connected to the differential connecting plate. The slider is connected to the differential connecting plate and has a movable groove. The feeding crank passes through the movable groove.

10. The sewing machine adjusting device according to claim 1, characterized in that, The rotation angle of the rotating shaft also has a wheel gap area, which is located between the tooth adjustment angle area and the needle pitch adjustment angle area to accommodate the installation of the adjustment mechanism, the tooth adjustment mechanism and the needle pitch adjustment mechanism.

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