Sewing machine presser foot and knife drive linkage

Abstract

The utility model provides a kind of sewing machine presser foot and cutter linkage driving device, belong to sewing machine technical field.It includes presser foot assembly, cutter assembly and the linkage driving mechanism being connected with presser foot assembly and cutter assembly, the linkage driving mechanism includes the electric drive piece with the driving shaft of the output circumferential power.By the driving shaft of single electric drive piece simultaneously connecting presser foot assembly and cutter assembly, and with opposite rotating direction drive both actions, linkage driving structure is formed, a set of independent driving mechanism is dispensed with, equipment internal installation space is greatly reduced, structure layout is simplified, it is beneficial to equipment miniaturization and portable research and development;It is ensured that presser foot and cutter action accurate cooperation simultaneously, avoid the problem such as cloth jam, thread end cutting not thoroughly caused by action out of step, reduce subsequent rework process, reduce equipment manufacturing cost and fault point quantity, shorten downtime maintenance time, improve equipment comprehensive operation efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of sewing machine technology and relates to a sewing machine presser foot and cutter linkage drive device. Background Technology

[0002] In the fields of garment processing and textile sewing, sewing machines, embroidery machines and other equipment are core sewing tools. The coordinated operation of their presser foot lifting mechanism and cutter mechanism directly affects sewing efficiency and finished product quality. The presser foot lifting mechanism needs to adjust the presser foot height in real time according to the fabric thickness and sewing process to ensure that the fabric is fed flat; the cutter mechanism needs to accurately trim thread ends and corners during sewing intervals to ensure that the sewn edges are clean. In traditional technology, due to the differences in the action logic and power requirements of the presser foot lifting mechanism and the cutting blade mechanism, they need to be equipped with independent drive mechanisms, such as independent motors, cylinders, or cam transmission components. This independent drive design has significant drawbacks: First, the two drive mechanisms require independent installation space inside the equipment, which not only leads to a larger overall size of the equipment but also increases the complexity of the internal structural layout—especially in the development of miniaturized and portable sewing equipment, where space conflicts are more prominent, limiting the optimization of the equipment structure and size reduction. Second, independent drives are prone to problems with poor synchronization of actions, such as the cutting blade moving prematurely before the presser foot is fully lifted, or the cutting blade lagging behind the presser foot's feeding rhythm, which not only affects sewing accuracy but may also cause fabric jamming and incomplete thread trimming, increasing subsequent rework processes. In addition, the setting of multiple drive mechanisms also increases the equipment manufacturing cost and maintenance difficulty. The increased number of parts leads to more potential failure points, and subsequent maintenance requires checking both systems separately, extending downtime for maintenance and reducing the overall operating efficiency of the equipment. Summary of the Invention

[0003] The purpose of this invention is to address the above-mentioned problems by providing a linkage drive device for the presser foot and the cutting blade of a sewing machine.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A sewing machine presser foot and cutter linkage drive device includes a presser foot assembly, a cutter assembly, and a linkage drive mechanism connected to the presser foot assembly and the cutter assembly. The linkage drive mechanism includes an electric drive component with a drive shaft capable of outputting circumferential power. Both ends of the drive shaft extend outside the electric drive component and are respectively connected to the presser foot assembly and the cutter assembly through a presser foot component transmission component and a cutter component transmission component. When the electric drive unit drives the presser foot assembly and the cutting blade assembly, the rotation directions of the drive shaft are opposite.

[0005] In the above-mentioned sewing machine presser foot and cutter linkage drive device, the two ends of the drive shaft are respectively connected to a first vertical output shaft and a second vertical output shaft through a split cam structure. The first vertical output shaft and the second vertical output shaft are respectively connected to the presser foot component transmission component and the cutter component transmission component. The split cam structures at both ends of the drive shaft are arranged in opposite directions.

[0006] In the above-mentioned sewing machine presser foot and cutter linkage drive device, the split cam structure includes a mating wheel and a drive wheel. The drive wheel is fixedly mounted on the drive shaft, and the mating wheel is rotatably mounted on the first vertical output shaft and the second vertical output shaft. The drive wheel is provided with a drive surface, and the drive surface is located on the side of the drive wheel facing the mating wheel. In the split cam structure connecting the drive shaft and the first vertical output shaft, the mating wheel is located below the drive wheel; In the split cam structure connecting the drive shaft and the second vertical output shaft, the mating wheel is located on the upper side of the drive wheel; When the drive shaft drives the first vertical output shaft to move through the split cam structure, the drive wheel and the mating wheel in the split cam structure connecting the drive shaft and the second vertical output shaft disengage; when the drive shaft drives the second vertical output shaft to move through the split cam structure, the drive wheel and the mating wheel in the split cam structure connecting the drive shaft and the first vertical output shaft disengage.

[0007] In the above-mentioned sewing machine presser foot and cutter linkage drive device, the outer end of the drive wheel is also provided with a rest surface, the rest surface is connected to the drive surface, and the radial distance between each position on the rest surface and the axis of the drive wheel is equal. The outer end of the drive wheel also has a protruding limiting part, which is connected to the rest surface on the side away from the drive surface.

[0008] In the above-mentioned sewing machine presser foot and cutter linkage drive device, the first vertical output shaft includes an upper connecting part, a middle connecting part and a lower connecting part. The upper connecting part and the lower connecting part are respectively connected to the middle connecting part through adjusting screw sleeves. The mating wheel is set on the upper connecting part, and the lower connecting part is connected to the presser foot transmission component. It also includes a first output shaft limiting block and a second output shaft limiting block fixed on the frame. The middle connecting part passes through the first output shaft limiting block and slides with it. The second output shaft limiting block has two limiting protrusions. The second vertical output shaft passes vertically through the two limiting protrusions and slides with them. A drive block connected to the cutting blade transmission component is fixed in the middle of the second vertical output shaft. The drive block is located between the two limiting protrusions. A spring seat is also fixed at the bottom of the second vertical output shaft. A linear return spring is provided between the spring seat and the limiting protrusion located on the lower side.

[0009] In the above-mentioned sewing machine presser foot and cutter linkage drive device, the presser foot assembly includes a presser foot base and a presser foot disposed directly above the presser foot base, and a guide plate is provided on the side of the presser foot; The aforementioned cleaver assembly includes a cleaver mounting roller rotatably mounted on a presser foot base and a cleaver positioned at the front end of the cleaver mounting roller. The cleaver is located on the side of the presser foot away from the guide plate. A cleaver seat is also protruding from the presser foot base. The cutting surface of the cleaver abuts against the side wall of the cleaver seat, and the cutting surface and the cleaver seat can form a shearing engagement.

[0010] In the aforementioned sewing machine presser foot and cutter linkage drive device, the presser foot transmission component includes a first presser foot transmission plate, a swing arm, and a second presser foot transmission plate. The middle part of the first presser foot transmission plate is rotatably connected to a transmission plate connecting plate fixed on the machine frame via a rotating shaft. The outer end of the first presser foot transmission plate is fixedly connected to the bottom end of the lower connecting part. The side of the first presser foot transmission plate away from the lower connecting part is connected to a drive plate connected to the swing arm via a hook connector. The end of the swing arm away from the drive plate is connected to the inner end of the second presser foot transmission plate. The presser foot assembly is located at the outer end of the second presser foot transmission plate. A return torsion spring is provided at the inner end of the first presser foot transmission plate, and the return torsion spring connects the first presser foot transmission plate and the machine frame.

[0011] In the above-mentioned sewing machine presser foot and cutter linkage drive device, the upper side of the second presser foot transmission plate is also connected to a presser foot adjustment component; The presser foot adjustment assembly includes a hollow tube connected to the frame. An adjustment shaft that is slidably connected to the lower part of the hollow tube and rotatably connected to the second presser foot transmission plate is provided. A rotating shaft is screwed to the upper part of the hollow tube. The rotating shaft and the hollow tube are screwed together. An adjustment spring is provided between the rotating shaft and the adjustment shaft. A limiting groove with a lower opening is also provided at the lower part of the hollow tube. An adjustment limiting rod that is inserted into the limiting groove is fixedly connected to the adjustment shaft.

[0012] In the above-mentioned sewing machine presser foot and cutter linkage drive device, the cutter transmission component includes a first cutter drive plate connected to the drive block and a second cutter drive plate connected to the cutter mounting roller. The first cutter drive plate and the second cutter drive plate have an included angle and are fixed by a tightening bolt. The end of the cutter mounting roller away from the cutter is circumferentially limited and axially slidably connected to the second cutter drive plate through a spline key structure.

[0013] In the aforementioned sewing machine presser foot and cutter linkage drive device, the cutter mounting roller is also fitted with a tensioning spring that can drive the cutter mounting roller to move closer to the cutter seat.

[0014] Compared with existing technologies, the advantages of this utility model are: 1. The presser foot assembly and the cutting blade assembly are connected simultaneously by the drive shaft of a single electric drive unit, and they are driven to move in opposite directions to form a linkage drive structure. This design eliminates a separate drive mechanism, greatly reduces the internal installation space of the equipment, simplifies the structural layout, and facilitates the development of miniaturized and portable equipment. At the same time, it ensures precise coordination between the presser foot and the cutting blade, avoiding problems such as fabric jamming and incomplete thread cutting caused by asynchronous movements, reducing subsequent rework processes, lowering equipment manufacturing costs and the number of failure points, shortening downtime for maintenance, and improving the overall operating efficiency of the equipment.

[0015] 2. The drive shaft is connected to the first and second vertical output shafts by a split cam structure with opposite orientations at both ends, thereby driving the presser foot assembly and the cutter assembly respectively. The split cam structure with opposite orientations can accurately convert the circumferential power of the drive shaft into vertical output power, and ensure that the action logic of the presser foot assembly and the cutter assembly is adapted to the sewing process requirements. This design solves the problems of low power transmission efficiency and poor action coordination in traditional independent drive mechanisms, further enhances the stability of linkage drive, avoids the decrease in sewing accuracy caused by power transmission deviation, and simplifies the power transmission structure, reduces the number of internal parts of the equipment, and reduces structural complexity.

[0016] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0017] Figure 1 This is a three-dimensional drawing of the present invention; Figure 2 This is a three-dimensional view of another aspect of this utility model; Figure 3 This is a schematic diagram of the linkage drive mechanism; Figure 4 This is a structural diagram of the split cam structure; Figure 5 This is a structural schematic diagram of the pressure foot transmission component; Figure 6 This is a structural diagram of the transmission components of the cutting blade; Figure 7 This is a schematic diagram of the presser foot adjustment assembly. Detailed Implementation

[0018] like Figures 1-7As shown, a sewing machine presser foot and cutter linkage drive device includes a presser foot assembly 1, a cutter assembly 4, and a linkage drive mechanism 2 connected to the presser foot assembly 1 and the cutter assembly 4. The linkage drive mechanism 2 includes an electric drive component 202 with a drive shaft 201 capable of outputting circumferential power. Both ends of the drive shaft 201 extend outside the electric drive component 201 and are respectively connected to the presser foot assembly 1 and the cutter assembly 4 via a presser foot transmission component 101 and a cutter transmission component 401. When the electric drive component 202 drives the presser foot assembly 1 and the cutter assembly 4 to move, the rotation directions of the drive shaft 201 are opposite.

[0019] In this invention, the presser foot assembly and the cutting blade assembly are simultaneously connected by the drive shaft of a single electric drive unit, and the two are driven to move in opposite directions of rotation, forming a linkage drive structure. This design eliminates a separate drive mechanism, significantly reduces the internal installation space of the equipment, simplifies the structural layout, and facilitates the miniaturization and portability of the equipment. At the same time, it ensures precise coordination between the presser foot and the cutting blade, avoiding problems such as fabric jamming and incomplete thread cutting caused by asynchronous movements, reducing subsequent rework processes, lowering equipment manufacturing costs and the number of failure points, shortening downtime for maintenance, and improving the overall operating efficiency of the equipment.

[0020] Specifically, the two ends of the drive shaft 201 are connected to a first vertical output shaft 102 and a second vertical output shaft 402 via a split cam structure 3, respectively. The first vertical output shaft 102 and the second vertical output shaft 402 are respectively connected to the presser foot transmission component 101 and the cutter transmission component 401; the split cam structures 3 at both ends of the drive shaft 201 are arranged in opposite directions. The drive shaft is connected to the first and second vertical output shafts via a split cam structure with opposite orientations at both ends, thereby driving the presser foot assembly and the cutting blade assembly respectively. The split cam structure with opposite orientations can accurately convert the circumferential power of the drive shaft into vertical output power, and ensure that the action logic of the presser foot assembly and the cutting blade assembly is adapted to the sewing process requirements - such as the cutting blade preparing to cut when the presser foot is raised, or the cutting blade resetting when the presser foot is pressed down to feed material. This design solves the problems of low power transmission efficiency and poor action coordination in traditional independent drive mechanisms, further enhances the stability of linkage drive, avoids the decrease in sewing accuracy caused by power transmission deviation, and simplifies the power transmission structure, reduces the number of internal parts of the equipment, and reduces structural complexity.

[0021] Specifically, the split cam structure 3 includes a mating wheel 301 and a driving wheel 302. The driving wheel 302 is fixedly mounted on the driving shaft 201, and the mating wheel 301 is rotatably mounted on the first vertical output shaft 102 and the second vertical output shaft 402. The driving wheel 302 is provided with a driving surface 303, and the driving surface 303 is located on the side of the driving wheel 302 facing the mating wheel 301. In the split cam structure 3 connecting the driving shaft 201 and the first vertical output shaft 102, the mating wheel 301 is located below the driving wheel 302. In the split cam structure 3 of the vertical output shaft 402, the mating wheel 301 is located on the upper side of the drive wheel 302; when the drive shaft 201 drives the first vertical output shaft 102 to move through the split cam structure 3, the drive wheel 302 and the mating wheel 301 in the split cam structure 3 connecting the drive shaft 201 and the second vertical output shaft 402 disengage; when the drive shaft 201 drives the second vertical output shaft 402 to move through the split cam structure 3, the drive wheel 302 and the mating wheel 301 in the split cam structure 3 connecting the drive shaft 201 and the first vertical output shaft 102 disengage.

[0022] The split cam structure employs a combination of drive wheels and mating wheels. By adjusting the vertical position of the mating wheels relative to the drive wheels (matting wheels on the presser foot side are below, mating wheels on the cutter side are above), when the drive shaft drives one set of output shafts, the other set of drive wheels disengages from the mating wheels. This design ensures that the presser foot assembly and the cutter assembly operate completely independently without interference. For example, when the presser foot adjusts its height, the cutter mechanism remains stationary, preventing malfunctions. When the cutter is cutting, the presser foot mechanism maintains its current stable state. This effectively solves the "action superposition interference" problem that easily occurs in traditional linkage structures, ensuring that when the presser foot adjusts its height in real time according to the fabric thickness and sewing process, the cutter will not move prematurely or lag behind. At the same time, it ensures that when the cutter accurately cuts thread ends and corners, the presser foot will not shift, affecting the flat conveying of the fabric, significantly improving sewing accuracy and finished product quality.

[0023] Specifically, the outer end of the drive wheel 302 is provided with a rest surface 304, which is connected to the drive surface 303. The radial distance between each position on the rest surface 304 and the axis of the drive wheel 302 is equal. The outer end of the drive wheel 302 is also provided with a limiting part 305, which is connected to the side of the rest surface 304 away from the drive surface 303. The rest surface design at the outer end of the drive wheel ensures that the output shaft remains in a fixed position when the mating wheel contacts the rest surface. This ensures that the presser foot assembly or the cutting blade assembly remains stable during specific stages of the sewing process (such as the presser foot stably holding the fabric feed, or the cutting blade waiting for the next action after cutting), preventing component shaking caused by the continuous rotation of the drive wheel. The limiting part restricts the range of motion of the mating wheel, preventing it from detaching from the drive wheel and ensuring the reliability of power transmission. This design solves the problems of no clear rest position and easy dislocation of components in traditional cam structures, improves the operational stability of the linkage drive mechanism, avoids sewing interruptions caused by component shaking or dislocation, extends the service life of the equipment, and reduces the maintenance frequency caused by component dislocation.

[0024] Specifically, the first vertical output shaft 102 includes an upper connecting part 103, a middle connecting part 104, and a lower connecting part 105. The upper connecting part 103 and the lower connecting part 105 are respectively connected to the middle connecting part 104 through adjusting screw sleeves 106. A mating wheel 301 is disposed on the upper connecting part 103. The lower connecting part 105 is connected to the pressure foot transmission component 101. It also includes a first output shaft limiting block 107 and a second output shaft limiting block 403 fixed on the frame. The middle connecting part 104 passes through the first output shaft limiting block 107 and is connected to the first output shaft. The limiting block 107 is slidably engaged. The second output shaft limiting block 403 has two limiting protrusions 404. The second vertical output shaft 402 vertically passes through the two limiting protrusions 404 and is slidably connected to the limiting protrusions 404. A driving block 405 connected to the cutting blade transmission component 401 is fixedly connected to the middle of the second vertical output shaft 402. The driving block 405 is located between the two limiting protrusions 404. A spring seat is also fixedly connected to the bottom end of the second vertical output shaft 402. A linear return spring 406 is provided between the spring seat and the limiting protrusion 404 located on the lower side. The first vertical output shaft allows for the detachable and length-adjustable upper, middle, and lower connecting parts via adjusting screw sleeves. This enables precise adjustment of the presser foot assembly's initial height and stroke according to different fabric thicknesses and sewing requirements, adapting to diverse sewing scenarios. The first and second output shaft limit blocks constrain the movement directions of the first and second vertical output shafts, ensuring unbiased vertical power transmission and preventing presser foot position deviations or cutter misalignment caused by output shaft wobbling. A linear return spring on the second vertical output shaft quickly resets the cutter assembly when the drive wheel disengages from the mating wheel, ensuring timely response for the next cutting action. This design solves the problems of non-adjustable component strokes, poor adaptability, and easy output shaft misalignment and delayed reset in traditional drive mechanisms. It improves the equipment's adaptability to different fabrics and sewing processes while ensuring the timeliness and accuracy of the cutter's action, reducing thread residue caused by delayed reset.

[0025] Specifically, the presser foot assembly 1 includes a presser foot base 123 and a presser foot 121 disposed directly above the presser foot base 123. A guide plate 122 is disposed on the side of the presser foot 121. The cleaver assembly 4 includes a cleaver mounting roller 407 rotatably disposed on the presser foot base 123 and a cleaver 408 disposed at the front end of the cleaver mounting roller 407. The cleaver 408 is located on the side of the presser foot 121 away from the guide plate 122. A cleaver seat 409 is also protruding from the presser foot base 123. The cutting surface of the cleaver 408 abuts against the side wall of the cleaver seat 409, and the cutting surface and the cleaver seat 409 can form a shearing engagement. The guide plate in the presser foot assembly guides the thread during sewing, preventing tangling or misalignment and ensuring even thread distribution, thus improving the aesthetics of the finished product. The shearing action between the cutter blade and its holder in the cutter assembly allows for precise cutting against the side wall of the holder during rotation, thoroughly trimming thread ends and corners, avoiding the incomplete cuts and rough edges common in traditional cutting methods. Furthermore, the cutter blade is mounted on the side of the presser foot furthest from the guide plate, optimizing component layout and avoiding spatial conflicts between the cutter blade, guide plate, and presser foot. This further simplifies the internal structure of the equipment and ensures that the actions of each component do not interfere with each other. This design optimizes both sewing details and structural layout, improving the neatness of sewn edges and enhancing the rationality of the equipment structure, reducing the risk of malfunctions caused by component layout conflicts.

[0026] Specifically, the presser foot transmission component 101 includes a first presser foot transmission plate 108, a swing arm 109, and a second presser foot transmission plate 110. The middle part of the first presser foot transmission plate 108 is rotatably connected to the transmission plate connecting plate 111 fixed on the frame via a rotating shaft. The outer end of the first presser foot transmission plate 108 is fixedly connected to the bottom end of the lower connecting part 105. The side of the first presser foot transmission plate 108 away from the lower connecting part 105 is connected to the drive plate 113 connected to the swing arm 109 via a hook connector 112. The end of the swing arm 109 away from the drive plate 113 is connected to the inner end of the second presser foot transmission plate 110. The presser foot assembly 1 is disposed at the outer end of the second presser foot transmission plate 110. A return torsion spring 114 is disposed at the inner end of the first presser foot transmission plate 108, and the return torsion spring 114 connects the first presser foot transmission plate 108 and the frame. The presser foot transmission component achieves power transmission through the cooperation of the first presser foot transmission plate 108, the swing arm 109, and the second presser foot transmission plate 110. This optimizes the force transmission path, enabling the power of the vertical output shaft to be efficiently transmitted to the presser foot assembly, improving the response speed and execution force of the presser foot lifting action, and ensuring the smoothness of the sewing operation of the equipment. The reset torsion spring at the inner end of the first presser foot transmission plate can drive the transmission plate to reset after the action is completed, ensuring that the presser foot assembly returns to the initial position in time, avoiding the trouble of manual reset, improving the automation level and work efficiency of the equipment, and reducing the number of operation steps. Specific process: When the driving surface of the drive wheel presses down on the mating wheel, the first vertical output shaft descends, the inner end of the first pressure foot transmission plate rises, and the reset torsion spring is compressed and accumulates elastic potential energy. At this time, the hook connector 112 moves upward and drives the swing arm to rotate through the drive plate, so that the pressure foot assembly realizes the pressing action; conversely, when the drive wheel rotates away from the mating wheel, the reset torsion spring 114 applies a reverse force to the first pressure foot transmission plate, so that the first vertical output shaft rises, and the pressure foot assembly completes the lifting action.

[0027] Preferably, a presser foot adjustment assembly is also connected to the upper side of the second presser foot transmission plate 110; the presser foot adjustment assembly includes a hollow tube 115 connected to the frame, an adjustment shaft 116 slidably disposed at the lower part of the hollow tube 115 and rotatably connected to the second presser foot transmission plate 110, a rotating shaft 117 screwed to the upper part of the hollow tube 115, the rotating shaft 117 and the hollow tube 115 being screwed together, an adjustment spring 118 being disposed between the rotating shaft 117 and the adjustment shaft 116, a limiting groove 119 with a lower opening being disposed at the lower part of the hollow tube 115, and an adjustment limiting rod 120 inserted into the limiting groove 119 being fixedly connected to the adjustment shaft 116. The presser foot adjustment assembly, through the cooperation of a hollow tube, adjusting shaft, rotating shaft, and adjusting spring, achieves precise adjustment of presser foot pressure and height. The screw-in structure of the rotating shaft precisely controls the compression of the adjusting spring, thereby adjusting the pressure of the presser foot on the fabric to adapt to different fabric thicknesses (e.g., thicker fabrics require increased pressure to ensure stable conveying, while thinner fabrics require reduced pressure to avoid fabric damage). The cooperation of the limiting slide and the adjusting limit rod restricts the movement range of the adjusting shaft, preventing excessive pressure adjustment that could damage components. This design solves the problems of traditional presser foot pressure being non-adjustable or having low adjustment precision, significantly improving the equipment's adaptability to fabrics of different thicknesses, avoiding fabric damage or conveying slippage due to improper presser foot pressure, while ensuring the safety and stability of pressure adjustment.

[0028] Specifically, the blade transmission component 401 includes a first blade drive plate 410 connected to the drive block 405 and a second blade drive plate 411 connected to the blade mounting roller 407. The first blade drive plate 410 and the second blade drive plate 411 have an included angle and are fixed by a tightening bolt 412. The end of the blade mounting roller 407 away from the blade 408 is circumferentially limited and axially slidably connected to the second blade drive plate 411 through a spline key structure. In the transmission component of the cutting blade assembly, the first and second cutting blade drive plates are fixed at an angle by tightening bolts. The cutting angle of the cutting blade can be precisely controlled by adjusting this angle to adapt to the cutting needs of different sewing edges (such as right-angled edges and beveled edges). The cutting blade mounting roller is connected to the second cutting blade drive plate via a toothed keyway, achieving circumferential limiting and axial sliding. This ensures that the mounting roller can be finely adjusted axially while transmitting rotational power, guaranteeing the cutting precision of the cutting blade and its holder. This design solves the problems of traditional cutting blades having non-adjustable cutting angles and low cutting precision, improving the diversity and accuracy of sewing edge cutting, avoiding a decline in finished product quality due to improper cutting angles or misalignment, and enhancing the flexibility and reliability of the cutting blade transmission.

[0029] Preferably, the cutting blade mounting roller 407 is further fitted with a tensioning spring 413 that drives the cutting blade mounting roller 407 to move closer to the cutting blade seat 409. The tensioning spring on the cutting blade mounting roller can continuously drive the cutting blade to move closer to the cutting blade seat, ensuring that the cutting blade and the cutting blade seat always maintain a tight cutting fit, avoiding the problem of incomplete cutting and thread residue caused by the increased gap between the cutting blade and the cutting blade seat due to component wear after long-term use. This design solves the problem of decreased cutting accuracy due to component wear in traditional cutting blade mechanisms, extends the service life of the cutting blade and the cutting blade seat, reduces the maintenance frequency caused by the increased cutting gap, and ensures the cleanliness of the sewn edges during long-term use, improving the stability and durability of the equipment operation.

[0030] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A linkage drive device for a sewing machine presser foot and cutter blade, comprising a presser foot assembly (1), a cutter blade assembly (4), and a linkage drive mechanism (2) connected to the presser foot assembly (1) and the cutter blade assembly (4), characterized in that, The linkage drive mechanism (2) includes an electric drive unit (202) with a drive shaft (201) capable of outputting circumferential power. Both ends of the drive shaft (201) extend out of the electric drive unit (202) and are respectively connected to the presser foot assembly (1) and the cutter assembly (4) through the presser foot transmission component (101) and the cutter transmission component (401). When the electric drive unit (202) drives the presser foot assembly (1) and the cutter assembly (4) to operate, the rotation direction of the drive shaft (201) is opposite.

2. The sewing machine presser foot and cutter linkage drive device according to claim 1, characterized in that, The drive shaft (201) is connected to a first vertical output shaft (102) and a second vertical output shaft (402) at both ends by a split cam structure (3). The first vertical output shaft (102) and the second vertical output shaft (402) are respectively connected to the presser foot transmission component (101) and the cleaver transmission component (401). The split cam structures (3) at both ends of the drive shaft (201) are arranged in opposite directions.

3. The sewing machine presser foot and cutter linkage drive device according to claim 2, characterized in that, The split cam structure (3) includes a mating wheel (301) and a driving wheel (302). The driving wheel (302) is fixedly mounted on the driving shaft (201). The mating wheel (301) is rotatably mounted on the first vertical output shaft (102) and the second vertical output shaft (402). The driving wheel (302) is provided with a driving surface (303) and the driving surface (303) is located on the side of the driving wheel (302) facing the mating wheel (301). In the split cam structure (3) connecting the drive shaft (201) and the first vertical output shaft (102), the mating wheel (301) is located below the drive wheel (302); In the split cam structure (3) connecting the drive shaft (201) and the second vertical output shaft (402), the mating wheel (301) is located on the upper side of the drive wheel (302); When the drive shaft (201) drives the first vertical output shaft (102) to move through the split cam structure (3), the drive wheel (302) and the mating wheel (301) in the split cam structure (3) connecting the drive shaft (201) and the second vertical output shaft (402) disengage; when the drive shaft (201) drives the second vertical output shaft (402) to move through the split cam structure (3), the drive wheel (302) and the mating wheel (301) in the split cam structure (3) connecting the drive shaft (201) and the first vertical output shaft (102) disengage.

4. The sewing machine presser foot and cutter linkage drive device according to claim 3, characterized in that, The outer end of the drive wheel (302) is also provided with a rest surface (304), the rest surface (304) is connected to the drive surface (303), and the radial distance between each position on the rest surface (304) and the axis of the drive wheel (302) is equal; The outer end of the drive wheel (302) is also provided with a limiting part (305), which is connected to the side of the rest surface (304) away from the drive surface (303).

5. The sewing machine presser foot and cutter linkage drive device according to claim 3, characterized in that, The first vertical output shaft (102) includes an upper connecting part (103), a middle connecting part (104) and a lower connecting part (105). The upper connecting part (103) and the lower connecting part (105) are respectively connected to the middle connecting part (104) through adjusting screw sleeves (106). A mating wheel (301) is set on the upper connecting part (103). The lower connecting part (105) is connected to the pressure foot transmission component (101). It also includes a first output shaft limiting block (107) and a second output shaft limiting block (403) fixed on the frame. The middle connecting part (104) passes through the first output shaft limiting block (107) and slides with the first output shaft limiting block (107). The second output shaft limiting block (403) has two limiting protrusions (404). The second vertical output shaft (402) vertically passes through the two limiting protrusions (404) and slides with the limiting protrusions (404). A driving block (405) connected to the cutting blade transmission component (401) is fixed in the middle of the second vertical output shaft (402). The driving block (405) is located between the two limiting protrusions (404). A spring seat is also fixed at the bottom of the second vertical output shaft (402). A linear return spring (406) is provided between the spring seat and the limiting protrusion (404) located on the lower side.

6. The sewing machine presser foot and cutter linkage drive device according to claim 5, characterized in that, The presser foot assembly (1) includes a presser foot base (123) and a presser foot (121) disposed directly above the presser foot base (123). A guide plate (122) is provided on the side of the presser foot (121). The cleaver assembly (4) includes a cleaver mounting roller (407) rotatably mounted on a presser foot base (123) and a cleaver (408) mounted at the front end of the cleaver mounting roller (407). The cleaver (408) is located on the side of the presser foot (121) away from the guide plate (122). A cleaver seat (409) is also protruding from the presser foot base (123). The cutting surface of the cleaver (408) abuts against the side wall of the cleaver seat (409), and the cutting surface and the cleaver seat (409) can form a shearing fit.

7. The sewing machine presser foot and cutter linkage drive device according to claim 6, characterized in that, The presser foot transmission component (101) includes a first presser foot transmission plate (108), a swing arm (109), and a second presser foot transmission plate (110). The middle part of the first presser foot transmission plate (108) is rotatably connected to the transmission plate connecting plate (111) fixed on the frame via a rotating shaft. The outer end of the first presser foot transmission plate (108) is fixedly connected to the bottom end of the lower connecting part (105). The side of the first presser foot transmission plate (108) away from the lower connecting part (105) is connected via... The hook connector (112) is connected to the drive plate (113) connected to the swing arm (109). The end of the swing arm (109) away from the drive plate (113) is connected to the inner end of the second presser foot transmission plate (110). The presser foot assembly (1) is located at the outer end of the second presser foot transmission plate (110). The inner end of the first presser foot transmission plate (108) is provided with a reset torsion spring (114), which connects the first presser foot transmission plate (108) and the frame.

8. The sewing machine presser foot and cutter linkage drive device according to claim 7, characterized in that, The upper side of the second presser foot transmission plate (110) is also connected to a presser foot adjustment assembly; The presser foot adjustment assembly includes a hollow tube (115) connected to the frame. The lower part of the hollow tube (115) is slidably provided with an adjustment shaft (116) that is rotatably connected to the second presser foot transmission plate (110). The upper part of the hollow tube (115) is screwed with a rotating shaft (117). The rotating shaft (117) and the hollow tube (115) are screwed together. An adjustment spring (118) is provided between the rotating shaft (117) and the adjustment shaft (116). The lower part of the hollow tube (115) is also provided with a limiting groove (119) with a lower opening. An adjustment limiting rod (120) that is inserted into the limiting groove (119) is fixedly connected to the adjustment shaft (116).

9. The sewing machine presser foot and cutter linkage drive device according to claim 6, characterized in that, The blade transmission component (401) includes a first blade drive plate (410) connected to the drive block (405) and a second blade drive plate (411) connected to the blade mounting roller (407). The first blade drive plate (410) and the second blade drive plate (411) have an included angle and are fixed by a top bolt (412). The end of the blade mounting roller (407) away from the blade (408) is circumferentially limited and axially slidably connected to the second blade drive plate (411) through a spline key structure.

10. The sewing machine presser foot and cutter linkage drive device according to claim 9, characterized in that, The blade mounting roller (407) is also fitted with a tensioning spring (413) that can drive the blade mounting roller (407) to move closer to the blade holder (409).

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