A presser foot mechanism following a flat bed machine needle

Abstract

This utility model relates to the field of garment machinery technology, specifically a presser foot mechanism that moves in tandem with the needle of a flatbed sewing machine. The mechanism includes a follower rod, a drive seat, a follower base, a drive swing plate, a follower swing plate, a linkage plate, and a pattern sewing machine presser foot. The follower rod is vertically and parallel to the needle bar. The drive seat and follower base are fixed at the same horizontal position as the needle bar and follower rod, respectively. The lower ends of the drive swing plate and follower swing plate are hinged to their respective bases and have elongated grooves. The linkage plate slides through the elongated grooves via sliding pins at both ends, forming a purely mechanical transmission chain. The presser foot nozzle is fitted over the needle. Through hinged and sliding connections, the presser foot and needle move synchronously, solving the problems of puncture slippage and feed lag, thus improving sewing stability and quality.

Description

Technical Field

[0001] This utility model relates to the field of garment machinery technology, specifically to a presser foot mechanism that moves with the needle of a flatbed sewing machine. Background Technology

[0002] Currently, most presser feet on flatbed sewing machines on the market use independent lifting structures, such as pedal control or fixed pressure modes, lacking dynamic linkage with the needle movement. These traditional presser feet have the following technical defects: ① Lack of synchronous pressure during the piercing stage: When the needle pierces the fabric downwards, the traditional presser foot cannot press down synchronously, causing the fabric to slip or spring back due to lack of support at the moment of needle insertion, easily leading to loose stitches, skipped stitches, or fabric damage. Especially when sewing thick or smooth fabrics, the piercing force may "push up" the fabric, creating gaps that prevent the stitches from firmly securing the fabric layers; ② Motion lag during the feeding stage: When the needle completes piercing and rises, the traditional presser foot relies on an independent control mechanism to delay its rise, resulting in the presser foot not fully releasing pressure when the feed teeth push the fabric forward, causing the fabric to be unable to move smoothly due to frictional resistance. This not only reduces sewing efficiency but may also cause fabric wrinkles or stretching deformation due to pulling, especially in elastic fabrics or multi-layered splicing processes, easily leading to "fabric eating" and affecting fabric flatness; ③ Pressure mode cannot be dynamically adapted: Traditional presser feet use a fixed pressure design and cannot dynamically adjust the pressure according to the movement of the needle. For example, if the presser foot maintains high pressure when the needle rises, it will hinder the normal feed of the fabric; while if the pressure is insufficient during piercing, it cannot effectively fix the fabric, resulting in an uneven fabric surface and crooked stitches after sewing. Utility Model Content

[0003] To address the lack of existing technologies that employ purely mechanical structures to achieve synchronized movement between the presser foot and the needle throughout their entire stroke, making it difficult to simultaneously meet the dual requirements of "stable pressing during puncture" and "low-resistance fabric feeding during needle lifting," this utility model discloses a follow-up presser foot that dynamically matches the needle's trajectory. Through a mechanical linkage mechanism, it achieves synchronized up-and-down movement between the presser foot and the needle, thereby improving stability, feeding efficiency, and sewing quality during fabric sewing. The technical solution adopted is as follows:

[0004] A presser foot mechanism that moves with the needle of a flatbed sewing machine, including

[0005] The follower rod is slidably mounted on the head of the flatbed car, with its axis parallel to the axis of the needle bar of the flatbed car and both vertical.

[0006] The drive seat and the follower seat are fixed to the needle bar and the follower rod inside the machine head, respectively;

[0007] A drive swing plate is hinged at its lower end to a drive base and has a drive elongated oval groove. The extension direction of the elongated oval groove is consistent with the length direction of the drive swing plate.

[0008] A follower swing plate is hinged at its lower end to a follower seat and has a follower elongated oval groove. The extension direction of the follower elongated oval groove is consistent with the length direction of the follower swing plate.

[0009] The linkage plate has a drive pin and a follower pin respectively at both ends. The drive pin passes through the drive elongated oval groove and can slide relative to the drive elongated oval groove along the groove length and rotate around its own axis. The follower pin passes through the follower elongated oval groove and can slide relative to the follower elongated oval groove along the groove length and rotate around its own axis.

[0010] The presser foot of the pattern sewing machine includes a presser foot handle and a presser foot nozzle. The presser foot handle is fixed to the lower end of the follower rod, and the presser foot nozzle is tubular and sleeved on the outside of the needle of the flatbed sewing machine.

[0011] Furthermore, it also includes a lifting foot plate and a lifting foot cylinder; the lifting foot cylinder is fixed on the body of the flatcar; the middle part of the lifting foot plate is hinged to the body of the flatcar, its left end is hinged to the cylinder rod of the lifting foot cylinder, and its right end is hinged to the linkage plate. The hinge axis between the lifting foot plate and the linkage plate is located above the hinge axis between the linkage plate and the follower swing plate; and the inner end of the lifting foot plate is recessed to form a stepped facade; the linkage plate has an end facade, and the stepped facade abuts against the end facade. When the lifting foot cylinder presses down on the left end of the lifting foot plate during its stroke, it drives the follower swing plate, follower seat, follower rod and pattern machine presser foot to rise. At the same time, the right end of the linkage plate rotates upward around the hinge axis between the lifting foot plate and the linkage plate, driving the drive swing plate, needle bar and machine needle to the upper needle position.

[0012] Furthermore, the length of the linkage plate is 5-20 times the height of its end face.

[0013] Furthermore, an adjusting nut is screwed to the upper end of the follower rod, and a spring is sleeved on the follower rod between the adjusting nut and the follower seat. The spring force is adjusted by adjusting the upper and lower positions of the adjusting nut so that the follower sliding pin always abuts against the upper end of the follower elongated groove.

[0014] Furthermore, sliding sleeves are fixed on the body of the flat car near both ends of the follower rod. The upper sliding sleeve is in movable engagement with the circumferential surface of the adjusting nut, and the lower sliding sleeve is in sliding engagement with the follower rod.

[0015] Furthermore, when the needle bar moves up and down and drives the drive swing plate to move synchronously, the drive swing plate first generates a free stroke relative to the drive sliding pin—that is, when the drive swing plate swings, the drive sliding pin slides along the length of the drive elongated groove until the drive sliding pin abuts against the end of the drive elongated groove; after the free stroke ends, the drive swing plate pushes the linkage plate to move synchronously through the drive sliding pin, thereby driving the follower swing plate, follower rod and pattern machine presser foot to move up and down; the cooperation between the drive elongated groove and the drive sliding pin makes the movement of the follower rod lag behind the movement of the needle bar; the lifting amplitude of the follower rod is smaller than the lifting amplitude of the needle bar.

[0016] Furthermore, the length of the driving elongated groove is 30%-70% of the single-stroke displacement of the needle bar.

[0017] Furthermore, the length of the follower elongated groove is 10%-30% of the single-stroke displacement of the needle bar.

[0018] Furthermore, different models of pattern maker pressers are selected according to the different thicknesses of the needles.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. Purely mechanical synchronous linkage to achieve precise matching of presser foot and needle movement.

[0021] By employing a purely mechanical structure—with the follower rod and needle bar set parallel and vertically, and the drive swing plate and follower swing plate hinged together via a linkage plate—a rigid transmission chain is constructed: needle bar movement → swing plate transmission → follower rod lifting and lowering. This ensures that the presser foot and the needle move synchronously up and down throughout their entire stroke. Compared to traditional independent lifting presser feet that rely on pedals or springs for control and require no electronic signals or manual intervention, the rigid mechanical connection eliminates movement delays, allowing the presser foot to press down synchronously during needle puncture and lift synchronously during needle lifting. This fundamentally solves the core problems of "fabric slippage during puncture" and "presser foot lag during feeding."

[0022] 2. Dynamic pressing and precise alignment enhance sewing stability.

[0023] -Puncture stage: The presser foot is tubularly fitted on the outside of the needle. The pressing area is strictly coaxial with the needle puncture point, which can accurately fix the fabric around the needle, avoid the rebound of thick materials or the slippage of smooth materials, and reduce the loosening of stitches, skipped stitches and fabric damage.

[0024] - Feeding stage: The follower rod rises synchronously with the needle bar, the presser foot releases the fabric in time, and the feed teeth can push the fabric without obstruction, eliminating the frictional resistance caused by the independent lifting lag of the traditional presser foot, significantly improving the feeding smoothness of elastic fabrics or multi-layered fabrics, and avoiding problems such as "fabric eating" and "wrinkles".

[0025] 3. The mechanical structure is simple and reliable, suitable for industrial-grade high-frequency operations.

[0026] - No power source dependence: It achieves its function only through mechanical components such as swing plate, sliding pin, and elongated groove, without the need for motor, sensor or pneumatic system. It has strong resistance to oil and dust interference and can operate stably in harsh industrial environments to meet the needs of 24-hour continuous sewing.

[0027] - Compact and stable transmission chain: The design of "fixed" drive seat and follower seat and hinged lower end of swing plate ensures short mechanical transmission path and high rigidity, reduces movement gap and vibration, low maintenance cost and convenient disassembly and adjustment, and is suitable for household and industrial flat sewing machines.

[0028] 4. Versatile structural design, compatible with diverse sewing scenarios

[0029] The tubular sleeve structure of the presser foot nozzle can be adapted to different types of needles, and the parallel layout of the follower rod and needle bar fits the standard head space of the flatbed sewing machine, enabling the "follower presser foot" function without modifying existing equipment. Through the cooperation of the drive plate, the follower plate, and the linkage plate, the presser foot movement trajectory can be dynamically adjusted according to the elongated groove parameters as specified later in the claims, balancing the puncture stability of thick materials and the feeding flexibility of thin materials, significantly improving fabric adaptability and sewing quality.

[0030] In summary, this utility model, through the innovative design of a mechanical linkage structure, breaks through the technical bottlenecks of traditional presser feet, which are characterized by "asynchronous movement, lagging control, and complex structure," and has significant advantages in terms of synchronization, stability, reliability, and adaptability to various scenarios. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the present invention and the flatbed cart.

[0032] Figure 2 This is a schematic diagram of the structure of this utility model.

[0033] Figure 3 for Figure 2 A structural diagram from another perspective.

[0034] Figure 4 This is a schematic diagram of the linkage plate and the lifting pressure foot plate of this utility model. Detailed Implementation

[0035] like Figure 1-4 The presser foot mechanism shown is a type of presser foot mechanism that moves with the needle of a flatbed sewing machine, including...

[0036] The follower rod 201 is slidably mounted on the head of the flatbed 100, and its axis is parallel to the axis of the needle bar 101 of the flatbed 100, both being vertical.

[0037] The drive seat 202 and the follower seat 203 are respectively fixed on the needle bar 101 and the follower bar 201 inside the machine head;

[0038] The driving swing plate 204 is hinged at its lower end to the driving base 202 and has a driving elongated groove 2041. The extension direction of the elongated groove 2041 is consistent with the length direction of the driving swing plate 204.

[0039] The follower swing plate 205 is hinged at its lower end to the follower seat 203 and has a follower elongated circular groove 2051. The extension direction of the follower elongated circular groove 2051 is consistent with the length direction of the follower swing plate 205.

[0040] The linkage plate 206 has a drive pin 208 and a follower pin 209 respectively mounted at both ends. The drive pin 208 passes through the drive elongated circular groove 2041 and can slide relative to the drive elongated circular groove 2041 along the groove length and rotate around its own axis. The follower pin 209 passes through the follower elongated circular groove 2051 and can slide relative to the follower elongated circular groove 2051 along the groove length and rotate around its own axis.

[0041] The presser foot 207 of the pattern making machine includes a presser foot handle 2071 and a presser foot nozzle 2072. The presser foot handle 2071 is fixed to the lower end of the follower rod 201, and the presser foot nozzle 2072 is tubular and sleeved on the needle 102 of the flatbed 100.

[0042] I. Core Working Principle

[0043] This mechanism achieves the "lagging follow-up + amplitude attenuation" motion between the presser foot and the needle through a composite mechanical transmission chain of "needle bar movement → swing plate idle stroke sliding → rigid transmission → follower rod lifting and lowering". The specific transmission path is as follows:

[0044] Needle bar 101 reciprocates → drive swing plate 204 swings slide pin idle stroke → linkage plate 206 pushes and pulls → follower swing plate 205 swings slide pin secondary idle stroke → follower rod 201 lifts and lowers in stages → presser foot 207 follows with lag - power input: needle bar 101 is driven by the main shaft of the flat sewing machine to make vertical reciprocating motion, which drives the drive swing plate 204 to swing through drive seat 202;

[0045] - Transmission core: The driving elongated groove 2041 of the driving swing plate 204 and the driving sliding pin 208 form a "free stroke-rigid transmission" cooperation: In the initial stage of swing plate swing, the sliding pin slides freely in the groove for free stroke. After the swing plate swings through a certain angle, the sliding pin abuts the end of the groove and pushes the linkage plate 206 to transmit power; The following elongated groove 2051 of the following swing plate 205 and the following sliding pin 209 form a second free stroke, realizing the secondary lag and amplitude attenuation of the following rod 201 movement;

[0046] - Motion constraint: The follower rod 201 is set vertically parallel to the needle bar 101, and the presser foot nozzle 2072 is sleeved on the outside of the needle 102 to ensure that the movement trajectory of the presser foot is coaxial with the needle and avoid deviation.

[0047] II. Specific Work Process

[0048] Phase 1: Delayed follow-up process during the needle compression puncture phase

[0049] 1. Needle bar descent and drive plate idle stroke:

[0050] The needle bar 101 moves downward under the drive of the main shaft, and the drive seat 202 moves downward synchronously. The drive swing plate 204 swings clockwise with the lower hinge point as the axis. At this time, the drive sliding pin 208 slides upward in the drive elongated groove 2041. The length of the empty stroke groove is consistent with the swing direction of the swing plate. The linkage plate 206 is not pushed at the moment, and the presser foot 207 remains stationary, allowing the needle 102 to penetrate the fabric first to form a guide hole.

[0051] 2. Rigid transmission start-up and follower rod compression:

[0052] When the drive swing plate 204 swings until the drive sliding pin 208 abuts the top of the elongated groove 2041, the idle stroke ends, and the swing plate pulls the linkage plate 206 downward through the sliding pin. The linkage plate 206 drives the follower sliding pin 209 to slide downward in the follower elongated groove 2051 until it abuts the end of the groove, pushing the follower swing plate 205 to swing counterclockwise, thereby driving the follower rod 201 to slide downward.

[0053] 3. Presser foot delays and presses down to fix the fabric:

[0054] The presser foot 207 at the lower end of the follower rod 201 only begins to press down after the needle 102 has completed the initial puncture. The tubular structure of the presser foot nozzle 2072 precisely presses down on the fabric around the needle, avoiding increased puncture resistance or slippage of smooth fabric due to premature pressing of thick materials, and ensuring that the stitches are firmly fixed between the fabric layers.

[0055] Phase 2: The attenuation process of the needle lifting and feeding stage

[0056] 1. Needle bar upward movement and drive plate reset idle stroke:

[0057] After the needle bar 101 completes the puncture, it moves upward, and the drive seat 202 drives the drive swing plate 204 to swing counterclockwise to reset. The drive sliding pin 208 slides downward in the drive elongated groove 2041 for a free stroke, without pulling the linkage plate 206. The needle 102 first disengages from the fabric to make room for the feed dog.

[0058] 2. Reverse transmission of the linkage plate and lifting of the follower rod:

[0059] After the drive pin 208 abuts against the bottom of the elongated groove 2041, the drive swing plate 204 pushes the follower pin 209 to slide upward in the follower elongated groove 2051 through the linkage plate 206 until it abuts against the end of the groove, pulling the follower swing plate 205 to swing clockwise, and the follower rod 201 slides upward.

[0060] 3. Presser foot amplitude decreases and lifts to release fabric:

[0061] The lifting amplitude of the follower rod 201 is less than that of the needle bar 101 due to the double idle stroke design. The presser foot 207 releases some pressure in advance, and the feed dog can smoothly push the fabric forward, avoiding the fabric friction resistance caused by the lag of the traditional presser foot due to full lifting. It is especially suitable for wrinkle-free feeding of elastic fabrics or multi-layer spliced ​​materials.

[0062] Phase 3: Continuous Sewing Cycle with Double Lag Synergy

[0063] When the needle bar 101 reciprocates continuously, the drive swing plate 204 and the follower swing plate 205 cooperate through the double idle stroke of the elongated groove and the sliding pin, so that the movement of the presser foot 207 always lags behind the needle and the amplitude gradually decreases. For example, the needle stroke is 20mm → the drive end decreases to 15mm → the follower end decreases to 10mm, forming a dynamic coordination of "the needle punctures first and the presser foot presses later" and "the needle is lifted first and the presser foot is released later", which accurately matches the needs of each stage of sewing.

[0064] III. Key Motion Characteristics

[0065] 1. Lag follow-up and amplitude graded decay:

[0066] - By cooperating with the idle stroke of the drive / follow-up elongated groove and the sliding pin, the lag time of the presser foot 207's pressing / lifting action compared to the needle 102 is determined by the length of the elongated groove, ensuring that the needle penetrates the fabric first, and then the presser foot presses it stably, reducing puncture resistance.

[0067] - The lifting range of the follower rod 201 is a certain proportion of the stroke of the needle bar 101, which avoids excessive compression of the fabric by the presser foot and is suitable for the needs of strong fixation of thick materials and light pressure of thin materials.

[0068] 2. Spatial coaxiality and pressing precision:

[0069] The presser foot nozzle 2072 is fitted on the outside of the needle 102, and the follower rod 201 is set vertically parallel to the needle bar 101 to ensure that the pressing area of ​​the presser foot is always coaxial with the needle puncture point. Even in multi-layer fabrics or precision embroidery scenarios, it can avoid fabric shift caused by presser foot misalignment and improve stitch neatness.

[0070] 3. Pure mechanical reliability and environmental adaptability:

[0071] - It requires no electricity or pneumatic drive, and achieves its function solely through mechanical components such as swing plate, sliding pin, and elongated groove. It is resistant to oil and dust interference and is suitable for industrial-grade high-frequency reciprocating sewing, such as high-speed conditions at 8000 rpm.

[0072] - Hinged and sliding connection methods are easy to maintain. Only the hinge points need to be lubricated regularly. Worn parts such as sliding pins and elongated groove swing plates can be quickly replaced. Maintenance costs are reduced by more than 70% compared to traditional electric pressure feet.

[0073] Through the above structural innovations, our organization has achieved breakthroughs in "motion control precision", "fabric adaptability" and "industrial environment reliability", effectively solving the core technical defects of traditional presser feet.

[0074] In another preferred embodiment, it further includes a foot lifting plate 210 and a foot lifting cylinder 211; the foot lifting cylinder 211 is fixed to the body of the flatcar 100; the middle part of the foot lifting plate 210 is hinged to the body of the flatcar 100, its left end is hinged to the cylinder rod of the foot lifting cylinder 211, and its right end is hinged to the linkage plate 206; the hinge axis between the foot lifting plate 210 and the linkage plate 206 is located above the hinge axis between the linkage plate 206 and the follower swing plate 205; and the inner end of the foot lifting plate 210 is recessed. The stepped facade 2101; the linkage plate 206 has an end facade 2061, the stepped facade 2101 abuts against the end facade 2061. When the lifting presser foot cylinder 211 extends and presses down the left end of the lifting presser foot plate 210, it drives the follower swing plate 205, follower seat 203, follower rod 201 and pattern machine presser foot 207 to rise. At the same time, the right end of the linkage plate 206 rotates upward around the hinge axis between the lifting presser foot plate 210 and the linkage plate 206, driving the drive swing plate 204, needle bar 101 and machine needle 102 to the upper needle position. One-button synchronous lifting of the presser foot and needle is achieved through pneumatic control: when the presser foot lifting cylinder presses down on the left end of the presser foot plate, the right end pushes the linkage plate upward through the stepped vertical surface to flip it up, simultaneously driving the follower rod (presser foot) and the drive swing plate (needle bar) to lift to the upper needle position, which facilitates quick fabric changes, adjustment of the sewing path, or handling of stitch faults; the lifting action and the mechanical follower mechanism do not interfere with each other (the hinge shaft is located above the transmission path, and the direction of force is perpendicular to the direction of movement of the follower rod), ensuring that the pneumatic assistance does not affect the mechanical synchronization during normal sewing, taking into account both efficiency and operational flexibility.

[0075] In another preferred embodiment, the length of the linkage plate 206 is 5-20 times the height of its end face 2061. By setting the length of the linkage plate 206 to 5-20 times the height of its end face 2061, a ratio similar to that of a power arm and a resistance arm is formed. By utilizing the change in lever arm during circular motion, the larger stroke of the needle bar can be efficiently converted into the smaller stroke of the presser foot, meeting the movement requirements of the presser foot, improving the working performance of the mechanism, and adapting to the differentiated stroke requirements of different sewing conditions.

[0076] In another preferred embodiment, the upper end of the follower rod 201 is screwed with an adjusting nut 213. A spring 214 is sleeved on the follower rod 201 between the adjusting nut 213 and the follower seat 203. The spring force is adjusted by adjusting the up and down position of the adjusting nut 213 so that the follower sliding pin 209 always abuts against the upper end of the follower elongated groove 2051. The spring force ensures that the follower sliding pin and the elongated groove always abut against each other. Rotating the adjusting nut can precisely control the spring compression, eliminate the gap between the follower sliding pin and the follower elongated groove, and avoid the sliding pin moving or transmission losing step due to vibration during high-speed sewing. The preload design ensures the motion response accuracy of the follower swing plate, especially under high-frequency reciprocating conditions (such as a sewing speed of 8000 times / minute), which can reduce the idle stroke error and improve the stability and consistency of the presser foot follow-up.

[0077] In another preferred embodiment, sliding sleeves 212 are fixed on the body of the flatbed 100 near both ends of the follower rod 201. The upper sliding sleeve 212 is in circumferential engagement with the adjusting nut 213, and the lower sliding sleeve 212 is in slidable engagement with the follower rod 201. The upper and lower sliding sleeves improve the stability and coaxiality of the follower rod's movement: the upper sliding sleeve is in circumferential engagement with the adjusting nut, limiting the radial sway of the follower rod; the lower sliding sleeve is in slidable engagement with the rod body, forming a double guide, ensuring that the follower rod moves accurately in the vertical direction, avoiding misalignment between the presser foot and the needle due to skew (e.g., misalignment exceeding 0.5mm will affect sewing accuracy); the smooth inner wall design of the sliding sleeve (e.g., a wear-resistant coating) reduces frictional resistance, improving the response speed of the follower rod, making it suitable for thin materials or high-speed sewing scenarios.

[0078] In another preferred embodiment, when the needle bar 101 moves up and down and drives the drive swing plate 204 to move synchronously, the drive swing plate 204 first generates a free stroke relative to the drive sliding pin 208—that is, when the drive swing plate 204 swings, the drive sliding pin 208 slides along the length of the drive elongated groove 2041 until the drive sliding pin 208 abuts against the end of the drive elongated groove 2041; after the free stroke ends, the drive swing plate 204 pushes the linkage plate 206 to move synchronously through the drive sliding pin 208, thereby driving the follower swing plate 205, the follower rod 201 and the pattern machine presser foot 207 to move up and down; the cooperation between the drive elongated groove 2041 and the drive sliding pin 208 makes the movement of the follower rod 201 lag behind the movement of the needle bar 101; the lifting amplitude of the follower rod 201 is smaller than the lifting amplitude of the needle bar 101. The presser foot movement is controlled by "idle stroke - rigid transmission" to achieve lag control and amplitude attenuation: the idle stroke of the drive pin in the elongated groove (the groove length is 30%-70% of the needle bar stroke) makes the presser foot pressing action lag behind the needle puncture by 0.05-0.2 seconds, allowing the needle to penetrate the thick material first to form a guide hole, and then the presser foot will stabilize and press down, reducing puncture resistance and preventing slippage between fabric layers; the amplitude attenuation characteristic avoids the stretching and deformation of elastic fabrics caused by excessive pressing of the presser foot, which is especially suitable for fragile fabrics such as knitted fabrics or silk.

[0079] In another preferred embodiment, the length of the driving elongated groove 2041 is 30%-70% of the single-stroke displacement of the needle bar 101. The length of the follower elongated groove 2051 is 10%-30% of the single-stroke displacement of the needle bar 101. Through the graded idle stroke design, the presser foot movement lags behind the needle in two ways, and the lifting amplitude decreases progressively. This ensures that the needle punctures first, followed by stable pressing by the presser foot, and also adapts to the needs of strong fixation for thick materials and light pressing for thin materials, significantly improving the sewing quality and efficiency of various fabrics.

[0080] In another preferred embodiment, selecting different models of pattern sewing machine presser feet according to different needle thicknesses ensures precise matching between the needle and presser foot holes, avoiding motion interference (such as needle-presser foot collision) and guaranteeing smooth sewing. Adapting to fabric characteristics, coarser needles paired with appropriate presser feet handle thicker materials, providing sufficient pressure; finer needles are used with finer presser feet for thinner materials, preventing fabric damage. Simultaneously, it optimizes stitch quality, reduces skipped stitches and thread breaks, resulting in even and aesthetically pleasing stitches, improving sewing quality and efficiency, and meeting diverse process requirements.

[0081] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A presser foot mechanism (200) that moves with the needle of a flatbed sewing machine, characterized in that, include The follower rod (201) is slidably set at the head of the flatbed (100), and its axis is parallel to the axis of the needle bar (101) of the flatbed (100), and both are vertical; The drive seat (202) and the follower seat (203) are fixed on the needle bar (101) and the follower rod (201) inside the machine head, respectively; The driving swing plate (204) is hinged at its lower end to the driving base (202) and has a driving elongated groove (2041) provided. The extension direction of the elongated groove (2041) is consistent with the length direction of the driving swing plate (204). The follower swing plate (205) is hinged at its lower end to the follower seat (203) and has a follower elongated circular groove (2051) provided. The extension direction of the follower elongated circular groove (2051) is consistent with the length direction of the follower swing plate (205). The linkage plate (206) has a drive pin (208) and a follower pin (209) respectively at both ends. The drive pin (208) passes through the drive elongated groove (2041) and can slide relative to the drive elongated groove (2041) along the groove length direction and rotate around its own axis. The follower pin (209) passes through the follower elongated groove (2051) and can slide relative to the follower elongated groove (2051) along the groove length direction and rotate around its own axis. The pattern machine presser foot (207) includes a presser foot handle (2071) and a presser foot nozzle (2072). The presser foot handle (2071) is fixed at the lower end of the follower rod (201), and the presser foot nozzle (2072) is tubular and sleeved on the needle (102) of the flatbed (100).

2. The presser foot mechanism that moves with the needle of a flatbed sewing machine according to claim 1, characterized in that, It also includes a foot lifting plate (210) and a foot lifting cylinder (211); the foot lifting cylinder (211) is fixed on the body of the flatcar (100); the middle part of the foot lifting plate (210) is hinged to the body of the flatcar (100), its left end is hinged to the cylinder rod of the foot lifting cylinder (211), and its right end is hinged to the linkage plate (206). The foot lifting plate (210) and the linkage plate (206) are connected. The hinge axis is located above the hinge axis of the linkage plate (206) and the follower swing plate (205); and the inner end of the lifting foot plate (210) is recessed to form a stepped facade (2101); the linkage plate (206) has an end facade (2061), the stepped facade (2101) abuts against the end facade (2061), when the lifting foot cylinder (211) presses down the left end of the lifting foot plate (210), it drives the follower swing plate (205), follower seat (203), follower rod (201) and pattern machine foot (207) to rise, and at the same time the right end of the linkage plate (206) rotates upward around the hinge axis of the lifting foot plate (210) and the linkage plate (206), driving the drive swing plate (204), needle bar (101) and needle (102) to be in the upper needle position.

3. The presser foot mechanism that moves with the needle of a flatbed sewing machine according to claim 2, characterized in that, The length of the linkage plate (206) is 5-20 times the height of its end face (2061).

4. The presser foot mechanism that moves with the needle of a flatbed sewing machine according to claim 1, characterized in that, The upper end of the follower rod (201) is screwed with an adjusting nut (213). A spring (214) is sleeved on the follower rod (201) between the adjusting nut (213) and the follower seat (203). The spring force is adjusted by adjusting the upper and lower positions of the adjusting nut (213) so that the follower sliding pin (209) always abuts against the upper end of the follower elongated groove (2051).

5. The presser foot mechanism that moves with the needle of a flatbed sewing machine according to claim 4, characterized in that, Sliding sleeves (212) are fixed on the body of the flat car (100) near both ends of the follower rod (201). The upper sliding sleeve (212) is in movable engagement with the circumferential surface of the adjusting nut (213), and the lower sliding sleeve (212) is in sliding engagement with the follower rod (201).

6. The presser foot mechanism that moves with the needle of a flatbed sewing machine according to claim 1, characterized in that, When the needle bar (101) moves up and down and drives the drive swing plate (204) to move synchronously, the drive swing plate (204) first generates a free stroke relative to the drive sliding pin (208) - that is, when the drive swing plate (204) swings, the drive sliding pin (208) slides along the length of the drive elongated groove (2041) until the drive sliding pin (208) abuts against the end of the drive elongated groove (2041); after the free stroke ends, the drive swing plate (204) pushes the linkage plate (206) to move synchronously through the drive sliding pin (208), thereby driving the follower swing plate (205), follower rod (201) and pattern machine presser foot (207) to move up and down; the cooperation between the drive elongated groove (2041) and the drive sliding pin (208) makes the movement of the follower rod (201) lag behind the movement of the needle bar (101); the lifting amplitude of the follower rod (201) is smaller than the lifting amplitude of the needle bar (101).

7. A presser foot mechanism that moves with the needle of a flatbed sewing machine according to claim 6, characterized in that, The length of the driving elongated groove (2041) is 30%-70% of the single-stroke displacement of the needle bar (101).

8. The presser foot mechanism that moves with the needle of a flatbed sewing machine according to claim 7, characterized in that, The length of the follower elongated groove (2051) is 10%-30% of the single-stroke displacement of the needle bar (101).

9. A presser foot mechanism that moves with the needle of a flatbed sewing machine according to claim 1, characterized in that, Select the appropriate presser foot (207) for the pattern making machine based on the different thicknesses of the needles.

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