Multi-thread embroidery machine

Abstract

The utility model provides an advanced multi-thread embroidery machine which comprises a transmission operated by a handle, and the transmission allows a group of second gears mounted on a main driving shaft to be meshed with each other; the transmission is provided with a handle shell provided with a through hole, the handle can be locked at a selected speed through a first spring and a ball body, and the handle comprises at least one vertical line shaft column set. A movable arm of the first gear is provided with a smoothing rod; the pressure applied to the spool can be adjusted; the vertical line shaft column set can ascend and descend along with the movable arm and can rotate around the axis of the vertical line shaft column set along with the movable arm, so that a thread shaft is allowed to be replaced or removed, a plurality of embroidery threads can be processed at the same time, complex patterns with automatic color and luster gradually changing are generated, and work cannot be interrupted even under the condition that the embroidery threads are broken. The embroidery machine provided by the utility model has higher productivity and use elasticity, and reduces the maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of textile machinery technology, and more particularly to an industrial or hand embroidery machine for producing embroidery patterns on various textile materials. This utility model focuses specifically on improving the management of multiple embroidery threads, continuous operation, and speed variation in embroidery machines. This utility model belongs to the category of mechanical embroidery machines, which can process multiple embroidery threads simultaneously, thus producing intricate and multi-colored embroidery patterns without frequent manual intervention. Background Technology

[0002] Embroidery is an ancient technique in which decorative patterns are added to fabrics using embroidery threads (usually silk, cotton, or wool) to enhance their appearance. Embroidery is frequently used to elevate clothing, accessories, or interior textiles and can be done by hand or machine. Hand embroidery is one of the oldest and most traditional crafts, requiring a high degree of dexterity and patience, as each stitch is completed by hand with a fine needle. Various stitches, such as cross-stitch, outline stitch, and chain stitch, can be used to create a wide range of textures and patterns.

[0003] The innovation of embroidery threads themselves has also contributed greatly to the evolution of embroidery. In addition to traditional cotton and silk threads, metallic threads, fluorescent threads, and even synthetic fiber threads (such as polyester or nylon threads) are now widely used to enhance the special effects of embroidery designs.

[0004] The Kingdom of Morocco is renowned for the rich and intricate embroidery often found on its traditional clothing. Some of the most iconic garments, including the khaftan, djerraba, and short-sleeved robes, frequently feature striking hand-embroidered details. Moroccan embroidery, known for its regional diversity, plays a central role in these garment aesthetics, showcasing patterns that vary from region to region and city to city.

[0005] Moroccan embroidery is often highly intricate, particularly distinguished by its use of gold, silver, or silk threads to create geometric, floral, or calligraphic patterns on high-quality fabrics. Each region of Morocco has its own distinct style. For example, Fez is known for its exquisite floral embroidery, while Meknes is characterized by superior calligraphic designs. Tetouan and Sale are also renowned for their unique patterns and distinctive stitching techniques.

[0006] While traditional Moroccan embroidery is primarily done by hand, the introduction of embroidery machines has allowed for modern and diversified production while respecting ancestral patterns and techniques. This makes the garments more accessible to a wider audience, while preserving the high-quality craftsmanship for special occasions such as weddings.

[0007] Mechanical embroidery machines traditionally operate based on mechanical principles consisting of gears, levers, and cams. These machines were widely used in the 19th and 20th centuries, particularly during the two World Wars, for the production of military embroidery. They incorporated mechanical components to automate part of the embroidery process.

[0008] The main operating steps of a mechanical embroidery machine are as follows:

[0009] Mechanical needle movement: Mechanical embroidery machines use gears and cams to control the movement of the needle. Gears or slides drive the needle according to a predetermined pattern engraved on a drum or cylinder. This repetitive motion allows the needle to embroider on the fabric according to the pattern established by the operator.

[0010] Cam templates or shrink tubes: Embroidery patterns are often determined by a template or a series of cams fixed inside the machine. These cams are precision-cut metal or wooden blocks that guide the movement of various parts within the machine. In some cases, shrink tubes are used, which are devices that move a fabric frame located below the needle according to a larger hand-drawn pattern. This mechanical action copies the pattern onto the fabric at a smaller scale, allowing multiple identical copies to be produced.

[0011] Thread tension: In these machines, the thread tension is mechanically adjusted using screws and springs. The tension system maintains a constant tension on the thread to ensure uniform and even stitches. Improper tension adjustment can result in stitches that are too loose or too tight, affecting the quality of the embroidery.

[0012] Manual operation using a foot pedal: Some mechanical embroidery machines are operated manually using a foot pedal (similar to an old-fashioned sewing machine). The movement of the foot pedal transmits power to the machine's flywheel, which in turn actuates the internal mechanisms. The operator must coordinate skillfully to maintain a consistent rhythm and ensure regular and precise stitches.

[0013] Fabric frame: Like modern machines, mechanical embroidery machines use frames to hold the fabric in place. However, the operator must manually adjust the position of the frames between different parts of the embroidery, which requires extremely high precision to properly align the pattern and avoid misalignment.

[0014] Single thread usage: Mechanical machines are typically limited to using one embroidery thread at a time. If a pattern requires multiple colors, the operator must manually change the embroidery thread for each color, which slows down the embroidery process.

[0015] Manual fabric movement: In some machines, the movement of the fabric under the needle is not fully automated; the operator must manually adjust the fabric position to align with the embroidery pattern. This requires exceptional skill and experience to achieve consistent and aesthetically pleasing results.

[0016] For example, French patent FR730878 relates to a crank-operated mechanical embroidery machine designed to perform straight stitches, edge stitches, and zigzag stitches. This machine is equipped with special needles that maintain their vertical position while performing lateral skip stitches. This feature allows for complex embroidery work containing varying adjustable needle skip stitch amplitudes.

[0017] A unique feature of this machine is that its needle can be moved laterally via a control lever and a specific guiding system. The span of this lateral needle movement can be adjusted during use, allowing the needle to follow a precise path according to the needs of the embroidery. The lateral movement of the needle is controlled by a needle holder mounted on a forked lever, which is guided through an arc-shaped slot to adjust the height of the needle relative to the circular path of the feed teeth below. This ensures that the needle and feed teeth operate efficiently even at high speeds.

[0018] Therefore, this type of machine includes an insertable differential mechanism to control the synchronous movement between the needle and the feed teeth. This mechanism adjusts the position of the feed teeth according to the variation in the needle's lateral jump, ensuring that the feed teeth are always in the correct position relative to the needle.

[0019] This machine is operated by a crank, whose rotational motion is transmitted to different mechanical components via a series of gears and drive shafts. This system controls not only the vertical and lateral movement of the needles, but also the rotation of the feed teeth located below the needle plate.

[0020] This machine is designed for a wide range of embroidery applications, including running stitch, edge stitch, and zigzag stitch, making it particularly suitable for complex embroidery requiring precise control of the needle and feed teeth. This improvement increases speed and accuracy while ensuring machine stability in both industrial and manual operations.

[0021] British Patent GB2121445 relates to an embroidery machine equipped with a dedicated standby device for embroidery machines. This type of embroidery machine allows several important components (including needles, sleeves, and presser feet) to automatically retract and reposition themselves when sewing power is interrupted. The standby device includes a lever and a cam mechanism, wherein each component is raised by an individual lever connected to a specific cam, allowing the vertical component to be moved out of the work area and returned to its operating position when sewing resumes.

[0022] Technically, this system uses multiple grooved cams and oscillating levers to synchronize the vertical movement of the needle, sleeve, and presser feet. These components are operated by rotating the cams 180 degrees to raise or lower them when work is paused or resumed. The levers are designed to raise these components, moving them away from the sewing area to clear space above the fabric, making it easier to change materials or correct stitches.

[0023] Furthermore, this new design incorporates a mechanism that allows adjustment of the needle height via a swing lever coupled to the main and auxiliary cams, thereby adjusting the length of the loops formed by the embroidery thread. This structure allows for precise adjustment of the embroidery loop length by correcting the center positions of the upper and lower needle stops, ensuring the continuity and consistency of the embroidery.

[0024] Other variations of the embodiments include an auxiliary locking mechanism that is synchronized with the main swing arm to enhance vertical needle movement control, providing more precise stitch management, and even for use in large-scale production environments.

[0025] Similarly, US Patent 1670978 relates to improvements in crank-operated embroidery machines, sewing machines, and openwork sewing machines. The presser foot is fixed to a rod and oscillates around two mutually perpendicular axes (XX axis and YY axis); guided by a hinge, it performs a vertical reciprocating motion. The hinge is mounted on a vertical tube and has several protrusions with smooth drilled holes to allow smooth, backlash-free movement. A rigid component (E) is mounted on the tube in a backlash-free manner, serving as a main shaft to stabilize the overall system and prevent accidental lateral movement. The oscillating component is positioned with screws (W1, W2, W3, W4) to ensure stable and precise alignment. This mechanism is based on the principle of a gimbal suspension, allowing the component to oscillate around the XX and YY axes while maintaining a fixed point on the ZZ vertical axis. This improves the system's durability and precision and reduces wear. Utility Model Content

[0026] The main purpose of this utility model is to provide a multi-thread embroidery machine with an improved structural design, which allows the lid structure, lining structure and zipper structure to be connected together without a sewing process, thereby shortening the assembly time of connecting the lid structure, lining structure and zipper structure.

[0027] This utility model relates to improvements in crank-operated embroidery machines, sewing machines, and openwork sewing machines, and in particular to improvements in a pivot mechanism that allows the presser foot to move vertically and guides the fabric.

[0028] This invention addresses the technical challenges encountered in changing the speed of the bobbin assembly in sewing or embroidery machines without complex disassembly and gear replacement. Previously, to obtain different suitable speeds for specific sewing or embroidery needs, the machine had to be stopped, certain gears disassembled, and replaced with gears of different sizes, resulting in lengthy interruptions and increased costs.

[0029] To solve this problem, this utility model provides a multi-thread embroidery machine, including a frame and at least one needle, which is operably connected to a needle bar to form embroidery stitches on a fabric; a presser foot guide arm with a U-shaped lower end, which, after installation, can move vertically parallel to the needle bar and slidably accommodate the needle bar; the presser foot guide arm can descend synchronously with the needle bar to press the fabric onto the position where the needle passes through via a presser foot; when the needle rises, the vertically moving presser foot guide arm can press the fabric onto the circumference of the needle and move the fabric horizontally; characterized in that the multi-thread embroidery machine includes:

[0030] A gearbox operated by a handle is mounted on the frame and engages with a carriage and a keyway gear located on a main drive shaft; the gearbox allows a set of second gears mounted on the main drive shaft to mesh with each other; the gearbox is equipped with a handle housing with perforations on its upper surface to indicate corresponding rotational speeds; the handle can be locked at a selected speed and secured to the selected speed using a first spring and a ball engaging with the perforations; and

[0031] At least one vertical spool assembly is mounted on the frame and rotates around a first gear axis; the movable arm of the first gear is equipped with a smoothing rod; the pressure applied to the spool can be adjusted by a second spring pressing against the spool and an adjusting nut; the vertical spool assembly can be raised and lowered with the movable arm and can rotate around its axis with the movable arm to allow for the replacement or removal of the spool.

[0032] The multi-thread embroidery machine includes an L-shaped spool support mounted on the frame and equipped with at least one rotating spool holder with a horizontal axis perpendicular to the pivot of the spool flange. The L-shaped spool support allows for adjustment of the rotation of the embroidery thread around the hole according to different positions. A pin connected to a movable locking arm holds the carriage in the desired position while allowing the spool column support to rotate along a longitudinal axis relative to the frame via a fourth gear.

[0033] The multi-thread embroidery machine, wherein a lifting assembly includes:

[0034] A needle bar that can move vertically through its upper and lower parts, and its upper end is provided with a third gear with upper and lower flanges;

[0035] At least one needle is concentrically fixed at the lower end of the needle bar; a third gear is installed in the center of the needle bar; when the fabric to be embroidered is pushed forward parallel by the fabric feeding mechanism, the rotation of a drive motor or drive pulley is transmitted to the needle bar via the third gear, driving the needle bar to rotate toward the fabric to be embroidered; and

[0036] A support body located at the rear of the upper end of the needle bar, and a lifting assembly capable of vertically moving at the front end of the support body; the lifting assembly includes a base, a first driving point extending laterally from the upper end, and a fork-shaped assembly protruding outward and providing a clamping effect.

[0037] The multi-thread embroidery machine, wherein the presser foot guide arm includes a four-way tube; the four-way tube allows the upper end of the presser foot guide arm to swing around two horizontal axes, the four-way tube has two flat surfaces, each with a through hole, the two through holes sharing an axis aligned with or parallel to the center side of the needle bar; the other two flat surfaces have smooth cylindrical holes, each of the smooth cylindrical holes being joined to a block with a trunnion.

[0038] The multi-thread embroidery machine further includes: a sleeve and several mating first bevel gears; the first bevel gears can drive the fifth gear and the sixth gear; the sixth gear holds a needle plate, aligning it with the upper surface of the base plate and vertically aligning it with the curved needle that mates with the machine needle; the curved needle is connected to a vertical shaft installed in a fixed bearing sleeve, and the needle plate is rotated to mate with each machine needle via the sixth gear and its associated mechanism; the curved needle is driven by a seventh gear installed on a shaft provided in the bearing, wherein the shaft is keyed to a second bevel gear and the first bevel gear, and the associated mechanism is driven by a handle.

[0039] The multi-thread embroidery machine, wherein the guide wire mechanism includes: a rod of a brake assembly, which is slidably disposed within a drilled hole of a block; the block is embedded in the front end and has an arc-shaped extended support portion, the concave portion of the block and the support portion being shaped to fit around the outer periphery of a collar; a bolt penetrates the support portion to secure the block to the collar; a first helical spring is installed in the drilled hole and positioned by an adjustable helical plug and engaged with the rear surface of the rod to elastically resist the retraction of the rod within the drilled hole; the rod has a groove to accommodate a stop screw for guiding the rod and preventing rotational movement; a stop member is provided at the end of the rod to resist the stop screw, so that the rod remains within the drilled hole; a relatively light second helical spring is provided on the outer periphery of the rod, engaged between the brake and the front end of the block to apply an initial tension to the flange.

[0040] In the multi-thread embroidery machine, a presser foot guide arm is U-shaped, wherein the lateral dimension of the presser foot guide arm is larger than the longitudinal dimension of the vertical spool column assembly, so as to allow the spool column assembly to rotate around the axis of the presser foot guide arm.

[0041] In the aforementioned multi-thread embroidery machine, the belt drive system is replaced by a motorized drive system coupled to the main drive shaft.

[0042] This invention provides an integrated speed change device that allows for quick and easy adjustment of the spindle speed without disassembling or replacing gears. The device includes a carriage mounted on the machine spindle, which engages different gears by moving the carriage, each gear corresponding to a specific speed; and a locking arm with a spring pin that engages with a predetermined hole on a fixed support frame to position the carriage, thus ensuring the stability and precision of speed adjustment.

[0043] This invention provides the possibility of quickly and efficiently changing the rotational speed of the bobbin assembly, reducing downtime and eliminating the need for most expensive gears. This solution is also adaptable to other machine architectures, offering greater flexibility for various sewing and embroidery operations.

[0044] Another technical problem this invention seeks to solve is how to vary the pressure on the spool bearing according to the rotational speed. Indeed, as the speed of the spool assembly increases, centrifugal force pushes the spool away from its axis, thus interfering with the tension of the embroidery thread and affecting the quality of the embroidery stitches. This phenomenon is particularly troublesome for maintaining consistent work quality.

[0045] To address this problem, the first improvement provided by this invention is the integration of a spring-loaded tensioner within the system. This tensioner is designed to swing freely on its pivot screw. It is mounted on a support fixed to the frame. This design allows the tensioner to adjust the pressure applied to the spool according to the rotational speed of the spool assembly, thereby ensuring constant thread tension under all operating conditions.

[0046] The tensioner support, equipped with screws and springs, plays a crucial role in this device. The tensioner support allows the tensioner to automatically adjust according to speed changes, ensuring precise control of the pressure on the spool. This pressure can also be fine-tuned using an adjusting nut, providing flexibility to meet the specific needs of each sewing job.

[0047] Another key improvement of this invention is the management of centrifugal force. As the rotation speed increases, centrifugal force often pushes the spool away from its central axis. Fortunately, the oscillation of the tensioner slightly reduces the pressure on the spool, compensating for this centrifugal force, thereby maintaining stable embroidery thread tension and preventing spool vibration or uncontrolled movement.

[0048] To ensure optimized pressure adjustment, the screw and adjusting nut system is designed for high precision. This precision is crucial for the machine to adapt to different types of embroidery thread and various speeds, significantly increasing the equipment's versatility. This adaptability also ensures consistent work quality regardless of the usage environment.

[0049] Furthermore, this invention also employs a novel type of tube and needle to address another issue related to the winding of braided thread around the needle. The tube is elongated and positioned to precisely guide the braided thread to the sewing disc, eliminating the risk of interrupting the work or causing stitch defects during winding. Attached Figure Description

[0050] Figure 1 A perspective view showing a preferred embodiment of the embroidery machine of this utility model;

[0051] Figure 2 This invention presents an exploded perspective view of the embroidery machine frame assembly, with particular emphasis on the various components of the final assembly and their configuration.

[0052] Figure 3 This invention presents an exploded perspective view of the embroidery thread tension mechanism of the embroidery machine.

[0053] Figure 4 This invention presents an exploded perspective view of the speed change mechanism of the embroidery machine.

[0054] Figure 5 This invention presents an exploded perspective view of the needle bar mechanism of the embroidery machine.

[0055] Figure 6 This invention presents an exploded perspective view of the rotating spool column support body of the embroidery machine according to the present invention.

[0056] Figures 7 to 9 This invention presents a three-dimensional exploded and assembled diagram of the fabric pressing foot bar of the embroidery machine.

[0057] Figure 10 This invention presents an exploded perspective view of the main shaft and transmission components of the embroidery machine.

[0058] Figure 11 This invention presents an exploded perspective view of the double-spindle hook mechanism of the embroidery machine.

[0059] Figure 12 This invention presents an exploded perspective view of the manual coupling mechanism of the embroidery machine.

[0060] Figure 13 This invention presents an exploded perspective view of the hook and loop mechanism of the embroidery machine.

[0061] Figure 14 This invention presents an exploded perspective view of the lower arm mechanism beneath the worktable of the embroidery machine.

[0062] Figure 15 This invention presents an exploded perspective view of the speed change mechanism of the embroidery machine.

[0063] Figure 16 This image shows an example of a decorative embroidery piece made using the embroidery machine of this invention.

[0064] Explanation of reference numerals in the attached drawings: 1-Frame; 100-Main control console; 105-Vertical spool assembly; 109-Lifting assembly; 109a-Base; 109b-First driving point; 111-First gear; 114-Second spring; 115-Smoothing rod; 13-Pressure foot guide rod support arm; 130-Pressure foot guide rod; 131-Pressure cloth foot; 135-Support body; 136-Main shaft; 137-Front cam; 141-Ternary shaft; 14-Four-way tube gearbox; 15-Spool assembly; 17-Sleeve rod; 2-Base plate; 200-Fixed bearing sleeve; 201-Bearing; 301-First helical spring; 302-Adjustable helical plug; 303-Rod; 304-Stop; 305-Block; 3051-Arc-shaped extension support; 3052-Drill hole; 307-Lever; 310-Bolt; 311-Second helical spring; 4-Transmission; 400-Housing; 4001-Spherical body; 4002-First spring; 4003-Perforation; 401-Handle; 402-Belt drive System; 403-Main drive shaft; 403a-Locking arm; 403b-Slide carriage; 406, 407, 408, 409-Coaxial gears; 414-Main cam; 419-Pin; 5-Lifting assembly; 501-Snapping assembly; 502-Second gear; 504-Third gear; 506-Vertical tube; 510-Needle bar; 511-Support body; 512-Clamping assembly; 513-Needle; 520-Fork assembly; 6-Feeding transmission mechanism; 7-Thread reel mechanism; 700 - Bollard support (column); 701- Rotating bollard; 702- Bollard flange; 703- Shaft; 705, 707- Fourth gear; 708- Pin; 8- Hand crank transmission mechanism; 806- Fifth gear; 809- Second bevel gear; 813- Handle; 818- Sleeve; 819- Shaft; 820- Seventh gear; 821- First bevel gear; 900- Vertical shaft; 903- Sixth gear; 905- Needle plate; 906- Curved needle; O- Center point; L- Lateral dimension. Detailed Implementation

[0065] The present invention will be further described below with reference to specific embodiments and accompanying drawings. The advantages and features of the present invention will become clearer with the description.

[0066] Numerous specific details are provided in the following description to aid in understanding the present invention. However, it should be noted that the present invention is not limited to the embodiments described herein; the present invention can be implemented in many different ways, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments described below.

[0067] This utility model is described in detail with reference to the accompanying drawings. In this detailed description, for ease of explanation, a three-dimensional view of the embroidery machine of this utility model is presented. This utility model can be implemented to a general scale; the drawings are merely examples to illustrate the utility model and not to limit its scope of protection. Furthermore, the three-dimensional dimensions (length, width, and depth) shown in the drawings are only illustrative.

[0068] In this detailed description of the invention, the term "embroidery" refers to a decorative technique that includes using embroidery thread to add various decorative patterns to beautify textiles. These patterns are created using specific stitches performed mechanically to produce intricate designs.

[0069] Please refer to the accompanying drawings. This utility model relates to an embroidery machine designed to produce intricate decorative embroidery patterns on various textiles. The operating center of the embroidery machine is a long arm, which allows operation on the fabric surface while facilitating precise material handling. Adjustable pressure feet firmly position the fabric, ensuring appropriate tension for achieving even embroidery.

[0070] This utility model provides a multi-thread embroidery machine, including at least one needle 513, operably connected to the needle 513 to form embroidery stitches on a fabric; a presser foot guide arm 13 with a U-shaped lower end, which, after installation, can move vertically parallel to the needle bar 510 and slidably accommodate the needle bar therein; the presser foot guide arm 13 can descend synchronously with the needle bar 510 so that the fabric is pressed onto the position where the needle passes through via a presser foot 131; when the needle 513 rises, the vertically movable presser foot guide arm 130 can press the fabric around the needle 513 and move the fabric horizontally; wherein: the multi-thread embroidery machine includes:

[0071] A transmission 4 operated by a handle 401 engages with a carriage 403b and a keyway gear located on a main drive shaft 403; the transmission allows a set of coaxial gears 407, 408, 406, and 409 mounted on the main drive shaft 403 to mesh with each other; the transmission is equipped with a handle housing with perforations 4003 located on the upper surface of the handle housing 400 to indicate the corresponding rotational speed; the handle 401 can be locked at a selected speed and is secured to the selected speed using a first spring 4002 and a ball 4001 that engages with the perforation; and

[0072] At least one vertical spool assembly 105 rotates around a first gear 111 axis; the movable arm of the first gear 111 is equipped with a smoothing rod 115; the pressure applied to the spool can be adjusted by a second spring 114 pressing against the spool and an adjusting nut; the vertical spool assembly can be raised and lowered with the movable arm and can rotate around its axis with the movable arm to allow the spool to be replaced or removed.

[0073] The thread spool mechanism 7 includes an L-shaped thread spool support 700, which is mounted on the frame 1 and equipped with at least one rotating thread holder 701 with a horizontal axis perpendicular to the pivot 703 of the thread spool flange 702. This support allows the rotation of the embroidery thread around the hole to be adjusted according to different positions. The pin 708 connected to the movable locking arm holds the carriage in the desired position, while allowing the thread spool support to rotate along a longitudinal axis relative to the frame 1 via the fourth gears 705 and 707.

[0074] One of the lifting components 5 includes:

[0075] A needle bar 510, which can be vertically translated via upper and lower parts, and its upper end is characterized by a third gear 504 with upper and lower flanges;

[0076] At least one needle 513 is concentrically fixed at the lower end of the needle bar 510; a third gear 504 is installed at the center of the needle bar 510; when the fabric to be embroidered is pushed forward parallel by the fabric feeding mechanism, the rotation of a drive motor or drive pulley is transmitted to the needle bar 510 via the third gear 504, driving the needle bar to rotate toward the fabric to be embroidered; and

[0077] A support body 135 located at the upper rear of the needle bar 510, and a lifting assembly that can move vertically at the front end of the support body 135; the lifting assembly includes a base 109a, a first driving point 109b extending laterally from the upper end, and a fork-shaped assembly 520 that protrudes outward and provides a clamping effect.

[0078] The presser foot guide arm 13 includes a four-way tube 145. The four-way tube 145 allows the upper end of the presser foot guide arm 13 to swing around two horizontal axes. Its unique feature is that the four-way tube 145 has two flat surfaces, each with a through hole. The two through holes share an axis that is aligned with or parallel to the central side of the needle bar 510. The other two flat surfaces are characterized by having smooth cylindrical holes. Each of the smooth cylindrical holes is joined with a block having an trunnion 141.

[0079] The device includes a tube 818 and several mating first bevel gears 821; the first bevel gears 821 can drive the fifth gear 806 and the sixth gear 903; the sixth gear 903 holds a needle plate 905, aligning it with the upper surface of the base plate 2 and vertically aligning it with the bent needle 906 that mates with the needle 513; the bent needle 906 is connected to a vertical shaft 900 installed in a fixed bearing sleeve 200, and the needle plate 905 is rotated in a conventional manner via the sixth gear 903 and its associated mechanism to mate with each needle; the bent needle 906 is also conventionally driven by a seventh gear 820 installed on a shaft 819 provided in the bearing 201, wherein the shaft 819 is keyed to the second bevel gear 809 and the first bevel gear 821, and the associated mechanism is driven by a handle 813.

[0080] The conductor mechanism includes: a rod 303 of a brake assembly, which is slidably disposed within a drilled hole 3052 of a block 305; the block is embedded in the front end and has an arc-shaped extended support portion 3051, the concave portion of the block and the support portion being shaped to fit around the outer periphery of a collar; a bolt 310 penetrates the support portion 3051 to secure the block 305 to the collar; a first helical spring 301 is installed in the drilled hole 3052 and is supported by an adjustable screw. The stopcock 302 is positioned and engaged with the rear surface of the rod 303 to elastically resist the retraction of the rod within the borehole; the rod 303 has a groove to accommodate a stop screw for guiding the rod and preventing it from rotating; a stop 304 is provided at the end of the rod to resist the stop screw, so that the rod remains within the borehole 3052; a relatively light second helical spring 311 is provided on the outer periphery of the rod 303, engaged between the brake and the front end of the block to apply an initial tension to the flange.

[0081] One of the presser foot guide rod arms 13 is U-shaped, wherein the lateral dimension “L” of component 130 (different from the 130 presser foot guide rod in the component symbol) is greater than the longitudinal dimension of the vertical spool column assembly 15, so as to allow the spool column assembly to rotate around the axis of the presser foot guide rod arm 13.

[0082] The belt drive system 402 can be replaced by a motorized drive system coupled to the main drive shaft 403.

[0083] The present invention provides a solution that integrates several mechanisms to improve existing embroidery machines. For example, the first improvement relates to an integrated speed change device (see [reference needed]). Figure 4 , Figure 5 , Figure 6 Appendix Figure 15As shown, this device allows for quick and easy adjustment of the spindle assembly speed without disassembling or replacing gears. The device includes a carriage 403b mounted on the main drive shaft 403 of the embroidery machine. Movement of the carriage 403b engages different coaxial gears 407, 408, 406, and 409, each corresponding to a specific speed. A locking arm 403a with a spring pin engages with a predetermined hole on a fixed support frame, keeping the carriage in position and thus ensuring the stability and accuracy of speed adjustment. The gearbox is equipped with a handle housing 400 having a perforation 4003 located on the upper surface of the handle housing 400 to indicate the corresponding rotational speed; the handle 401 can be locked at a selected speed and is fixed at the selected speed by a first spring 4002 and a ball 4001 that engages with the perforation, and at least one vertical spool assembly 105 that rotates around the axis of the first gear 111; the movable arm of the first gear 111 is equipped with a smoothing rod 115; the pressure applied to the spool can be adjusted by a second spring 114 pressing against the spool and an adjusting nut; the vertical spool assembly can be raised and lowered with the movable arm and can rotate around its axis with the movable arm to allow for the replacement or removal of the spool.

[0084] Please refer to Figure 5 , Figure 8 , Figure 9 , Figure 10 As shown: The machine according to the first embodiment of this utility model includes a hinge or four-way tube 145 for a crank-operated and feed transmission mechanism 6 of an embroidery machine and a sewing machine. When this hinge or four-way tube 145 slides on a vertical tube body 506 to perform its upward, downward and guiding actions, it allows the presser foot 130, driven by alternating linear motion, to swing around two orthogonal axes and two other intermediate axes. The aforementioned hinge or four-way tube 145 is provided with a shell, wherein two sides are cylindrical or spherical or have a section of flat spherical surface, while the other two sides are flat and have smooth cylindrical holes; a piece is joined inside the smooth cylindrical holes, which has two cylindrical surfaces and two flat surfaces and is provided with trunnions 141, constituting a unique feature.

[0085] In the first embodiment of this utility model, the four-way tube 145 is drilled with two smooth holes; the screw supporting the pressure foot 130 has a smooth cylindrical end that engages with the smooth holes, allowing the pressure foot 130 to pivot around the X-X' axis. The four-way tube 145 is further supported by a bearing, allowing the cylindrical axis of the pivot block to rotate within the bearing. The bearing is firmly fixed to the vertically moving sliding pressure foot.

[0086] A component is installed inside the four-way tube 145. As can be seen from its elevation and perspective views, this component has two cylindrical surfaces, while the other two flat surfaces are used to support the cylindrical trunnions. The four-way tube 145 has a corresponding recess, which has two symmetrically arranged partial cylindrical surfaces and two flat surfaces.

[0087] Please refer to Figure 9: As can be seen from this structure, when the four-way tube swings around the XX axis and other intermediate axes, it cannot move along the YY axis or XX axis. Moreover, when the pivot block moves vertically back and forth due to machine operation, the center point O will often remain on the ZZ axis.

[0088] Please refer to Figure 5 The diagram shows a first embodiment of the present invention. It includes a support console 100. The support console is rectangular and has multiple slots for fixing mechanical components. The support console includes upper and lower parts. The upper and lower parts support a vertically movable needle bar 510. The upper end of the needle bar has a third gear 504, which has upper and lower flanges. At least one needle 513 is concentrically fixed to the lower end of the needle bar 510. The third gear 504 is installed in the center of the needle bar 510. When the fabric to be embroidered is pushed horizontally forward by a fabric feeding mechanism, the rotation of a drive motor or drive pulley is transmitted to the needle bar 510 via the third gear 504, causing the needle bar to rotate toward the fabric to be embroidered.

[0089] Please refer to Figure 4 , Figure 5 , Figure 7 As shown: A support body 135 is located at the rear of the upper end of the needle bar 510. A vertically movable lifting assembly 109 is located at the front end of the support body 135. The lifting assembly 109 includes a base 109a, a first driving point 109b extending laterally from the upper end, and a fork-shaped assembly 520 for protruding clamping. A main cam 414 is rotatably mounted on the support body. A protruding pin 419 is provided at the rear end of the lever 307 to contact the upper surface of the main cam 414.

[0090] Please refer to Figure 4 , Figure 5 As shown: According to this configuration, when the main drive shaft 403 of the embroidery machine rotates continuously, it drives the main cam 414 to rotate. The pin 419 converts this rotational motion into the vertical movement of the lifting assembly 5, while the needle assembly 2 is driven to move vertically by the lifting assembly 5. The upper and lower parts of the support console 100 support a vertically movable sleeve 17, with the needle bar 510 parallel to the right side of the sleeve 17. A second gear 502 is fixed to the upper end of the needle bar 510. A front cam 137 is fixed to the front end of the main shaft 136. When the front cam 137 rotates, it causes a swing arm to swing.

[0091] Please refer to Figure 12 , Figure 13, Figure 14 As shown: The mechanism also includes a sleeve 818 and several first bevel gears 821 that cooperate with it; the first bevel gears 821 can drive the fifth gear 806 and the sixth gear 903. The sixth gear 903 engages a needle plate 905, which is aligned with the upper surface of the base plate 2 and vertically corresponds to the bent needle 906 that cooperates with the needle 513. The bent needle 906 is connected to a vertical shaft 900 mounted in a fixed bearing sleeve 200. In the two examples shown in the figure, the needle plate 905 is usually rotatable to cooperate with the needle. The seventh gear 820 is mounted on a shaft 819 axially mounted in the bearing 201. The bent needle 906 is usually operated via the seventh gear 820. The shaft 819 is keyed to the second bevel gear 809 and the first bevel gear 821 and is driven by the handle 813 of the hand crank transmission mechanism 8.

[0092] With the aforementioned configuration, rotating the shaft via handle 813 rotates the rotatable sleeve 506, resulting in the fastening assembly 501 rotating around its axis, adjusting the needle 513 as needed, and thus changing the direction of the embroidery stitch. The support ring and looper 906 work synchronously with the needle 513. The reciprocating motion of the shaft 819 via the main drive shaft 403 using the mechanisms shown in the figure allows the looper's action during embroidery to be appropriately related to the needle 513. The above-shown models of the machine also include a presser foot 131 or a conventional type of linkage mechanism, which can be operated in a conventional manner to cooperate with the remaining machine mechanisms.

[0093] In the preferred embodiments shown in the accompanying drawings, the pressing foot 130 is mounted on the machine via a ball joint, through which the pressing foot 130 can be appropriately synchronized with the associated mechanism to raise and lower the pressing foot 131.

[0094] As previously noted, the needle 513 extends downward through the fastening assembly and has a considerable length due to the presence of a support. The support 511 of the needle is fastened only at its upper end by a clamping assembly 512. The needle 513 is illustrated in the figures as a sewing machine needle, its lower end slidably passing through a guide, which is part of or supported on an adjustable support. This sliding joint can be an open dovetail joint, secured in its adjusted position with screws. The screws can be used to clamp the joint within the dovetail groove. This joint is flat and secured in its adjusted position with one or more adjusting screws.

[0095] Please refer to Figure 11As shown: an L-shaped spool bracket 700 is mounted on the frame 1 and equipped with at least one rotating spool holder 701 with a horizontal axis perpendicular to the pivot 703 of the spool flange 702; this bracket allows the rotation of the embroidery thread around the hole to be adjusted according to different positions; a pin 708 connected to a movable locking arm holds the carriage in the desired position, while allowing the spool column bracket to rotate along a longitudinal axis relative to the frame 1 fixed by the fourth gears 705 and 707.

[0096] Please refer to Figure 3 As shown: A brake assembly rod 303 is slidably disposed within a drilled hole 3052 of a block 305; the block is embedded in the front end and has an arc-shaped extended support portion 3051, the concave portion of the block and the support portion being shaped to fit around the outer periphery of a collar; a bolt 310 penetrates the support portion and secures the block 305 to the collar; a first helical spring 301 is installed in the drilled hole 3052 and positioned by an adjustable helical plug 302 and engaged with the rear surface of the rod 303 to elastically resist the rod retraction within the drilled hole; the rod 303 has a groove to accommodate a stop screw for guiding the rod and preventing rotational movement; a stop 304 is provided at the end of the rod to resist the stop screw, so that the rod remains within the drilled hole 3052; a relatively light second helical spring 311 is provided on the outer periphery of the rod 303, engaged between the brake and the front end of the block to apply an initial tension to the flange.

[0097] Please refer to Figure 4 As shown: The above description is based on the belt drive system 402, which can also be replaced by a motorized drive system coupled to the main drive shaft 403.

[0098] The above description is illustrative only and not restrictive. Those skilled in the art will understand that many modifications, variations or equivalents can be made without departing from the spirit and scope of the technical concept, but all will fall within the protection scope of this utility model.

Claims

1. A multi-thread embroidery machine, comprising a frame (1) and at least one needle (513), the needle (513) being operably connected to a needle bar (510) to form embroidery stitches on a fabric; a presser foot guide arm (13) having a U-shaped lower end, which, after installation, is capable of vertically moving parallel to the needle bar (510) and slidably accommodating the needle bar (510); the presser foot guide arm (13) is capable of descending synchronously with the needle bar (510) to press the fabric onto the position through which the needle passes via a presser foot (131); when the needle (513) rises, the vertically moving presser foot guide arm (130) can press the fabric onto the circumference of the needle (513) and move the fabric horizontally; characterized in that, The multi-thread embroidery machine includes: A gearbox (4) operated by a handle (401) is mounted on the frame (1) and engages with a carriage (403b) and a keyway gear on the main drive shaft (403); the gearbox (4) allows a set of second gears (407, 408, 406, 409) mounted on the main drive shaft (403) to mesh with each other; the gearbox (4) is equipped with a handle housing (400) with a perforation (4003) located on the upper surface of the handle housing (400) to indicate the corresponding rotational speed; the handle (401) can be locked at a selected speed and is fixed at the selected speed by a first spring (4002) and a ball (4001) engaging with the perforation (4003); and At least one vertical spool assembly (105) is mounted on the frame (1) and rotates around the axis of a first gear (111). The movable arm of the first gear (111) is equipped with a smoothing bar (115). The pressure applied to the spool can be adjusted by a second spring (114) pressing against the spool and an adjusting nut. The vertical spool assembly can be raised and lowered with the movable arm and can rotate around its axis with the movable arm to allow for the replacement or removal of the spool.

2. The multi-thread embroidery machine according to claim 1, characterized in that, The spool mechanism (7) includes an L-shaped spool support (700) mounted on the frame (1) and equipped with at least one rotating spool holder (701) with a horizontal axis perpendicular to the pivot (703) of the spool flange (702); the L-shaped spool support (700) allows the rotation of the embroidery thread around the hole to be adjusted according to different positions; a pin (708) connected to a movable locking arm holds the carriage (403b) in the desired position, while allowing the spool post support to rotate relative to the frame (1) fixed by the fourth gear (705, 707) along a longitudinal axis.

3. The multi-thread embroidery machine according to claim 2, characterized in that, A lifting assembly (5) includes: A needle bar (510) is capable of vertical translation via its upper and lower parts, and its upper end is provided with a third gear (504) with upper and lower flanges. At least one needle (513) is concentrically fixed at the lower end of the needle bar (510); a third gear (504) is installed at the center of the needle bar (510); when the fabric to be embroidered is pushed forward parallel by the fabric feeding mechanism, the rotation of a drive motor or drive pulley is transmitted to the needle bar (510) via the third gear (504), driving the needle bar (510) to rotate toward the fabric to be embroidered; and A support (135) located at the upper rear of the needle bar (510), and a lifting assembly (5) that can move vertically at the front end of the support (135); the lifting assembly (5) includes a base (109a), a first driving point (109b) extending laterally from the upper end, and a fork-shaped assembly (520) that protrudes outward and provides a clamping effect.

4. The multi-thread embroidery machine according to claim 3, characterized in that, The presser foot guide arm (13) includes a four-way tube (145); the four-way tube (145) allows the upper end of the presser foot guide arm (13) to swing around two horizontal axes. The four-way tube (145) has two flat surfaces, each with a through hole. The two through holes share an axis that is aligned with or parallel to the central side of the needle bar (510). The other two flat surfaces have smooth cylindrical holes, and each of the smooth cylindrical holes is joined with a block having a trunnion (141).

5. The multi-thread embroidery machine according to claim 1, characterized in that, Also includes: A set of tubes (818) and several mating first bevel gears (821); the first bevel gears (821) can drive the fifth gear (806) and the sixth gear (903); the sixth gear (903) holds a needle plate (905) so that it is aligned with the upper surface of the base plate (2) and vertically aligned with the bent needle (906) that mates with the needle (513); the bent needle (906) is connected to a vertical shaft (900) installed in a fixed bearing sleeve (200), and the needle plate (905) is rotated to mate with each needle via the sixth gear (903) and its associated mechanism; the bent needle (906) is driven by a seventh gear (820) installed on a shaft (819) provided in the bearing (201), wherein the shaft (819) is keyed to a second bevel gear (809) and the first bevel gear (821), and the associated mechanism is driven by a handle (813).

6. The multi-thread embroidery machine according to claim 3, characterized in that, The wire guide mechanism includes: a rod (303) of a brake assembly, which is slidably disposed within a drilled hole (3052) of a block (305); the block (305) is embedded in the front end and has an arc-shaped extended support portion (3051), the concave portion of the block (305) and the support portion (3051) are shaped to fit around the outer periphery of a collar; a bolt (310) penetrates the support portion (3051) to secure the block (305) to the collar; a first helical spring (301) is installed in the drilled hole (3052) and is supported by an adjustable helical plug ( 302) is positioned and engaged with the rear surface of the rod (303) to elastically resist the retraction of the rod (303) in the borehole; the rod (303) is provided with a groove to accommodate a stop screw for guiding the rod (303) and preventing the rod (303) from rotating; a stop (304) is provided at the end of the rod to resist the stop screw so that the rod (303) remains in the borehole (3052); a relatively light second helical spring (311) is provided on the outer periphery of the rod (303) and engaged between the brake and the front end of the block (305) to apply an initial tension to the flange.

7. The multi-thread embroidery machine according to claim 1, characterized in that, One of the presser foot guide rod arms (13) is U-shaped, wherein the lateral dimension of the presser foot guide rod (130) is greater than the longitudinal dimension of the vertical spool column assembly (15) to allow the spool column assembly (15) to rotate around the axis of the presser foot guide rod arm (13).

8. The multi-thread embroidery machine according to claim 7, characterized in that, The belt drive system (402) is replaced with a motorized drive system coupled to the main drive shaft (403).

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