Four-thread embroidery machine

Abstract

The utility model discloses a four-thread embroidery machine which comprises a thread coil mechanism, a shaft rod and a presser foot guide rod support arm, the thread coil mechanism is provided with a shuttle race guide rod and two fork parts, each fork part bears a shuttle core, and knitting threads are led out from the shuttle cores, enter an open hole of a pivoting crank through the shuttle race guide rod and descend towards the upper part of a presser foot guide rod; a cambered surface cam is arranged on the shaft rod and can move the presser foot sliding block crank along the direction of the cloth feeding rod; the presser foot guide rod supporting arm is provided with a presser foot guide rod used for containing the protruding position of the lower edge of the needle bar long sleeve. According to the utility model, four embroidery threads can be processed at the same time, so that multicolor gradient complex embroidery patterns can be generated. The embroidery machine disclosed by the utility model is combined with an improved system, can be used for synchronizing components, managing the tension of embroidery threads and preventing the embroidery threads from being tangled, and can accurately control the movement of a machine needle and fabrics through a novel J-shaped bent arm mechanism.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of industrial or hand embroidery machine for producing embroidery pattern on various textile materials in the field of textile machinery science and technology.The utility model belongs to the secondary field of mechanical embroidery machine, four embroidery threads can be processed simultaneously, so that complex and multicolor gradient embroidery pattern can be produced without frequent manual intervention. BACKGROUND

[0002] Mechanical embroidery machine relies on purely mechanical system without digital assistance, and produces pattern on fabric by the coordinated movement of needle and embroidery frame. One of the most famous innovations in this field is the development of embroidery machine capable of producing chain stitch and guipure stitch, which can provide diversified texture and embossed pattern on fabric.

[0003] Among these machines, a special type brings significant changes to mechanical embroidery: hand-guided (hand-guided) embroidery machine. This type of machine is used to produce continuous stitches such as Beauvais stitch (or chain stitch), which can manually follow the pattern drawn on the fabric and is famous for this. The fabric is positioned by a crank system or a foot pedal system, the needle action is synchronized with the embroidery frame, and it has the freedom of movement that is rare in traditional mechanical machines. This mechanism operates on a universal drive device, and the operator guides the fabric below the needle to form a pattern, making the pattern more traditional and manual, while also benefiting from machine assistance to ensure regular stitches.

[0004] The key mode in this field is that the machine is good at "under-knitting" and chain stitch, which is highly praised for adding thin ropes, beads, and other composite decorative elements. This mode is equipped with an additional rotary shuttle that can hook the embroidery thread and weave it around the needle to form continuous loops or delicate decorative edges.

[0005] The principle of this type of embroidery machine is based on the ability to mechanically repeat the movement of the needle accurately to produce standard patterns with stitch variations. In addition, some models can perform towel embroidery or guipure embroidery, which use multiple layers of embroidery thread to provide a completely different three-dimensional effect.

[0006] The main feature of this machine is to include a hand-operated feed system below the machine table controlled by a handle, which allows the operator to guide the movement of the embroidery frame according to the pattern to be produced. Some machines also include accessories for sewing sequins, knitting threads, and even performing bead embroidery, thus enhancing their versatile functions and capabilities to produce outstanding embroidery products through manual control.

[0007] Although digital embroidery machines exist, mechanical embroidery machines continue to be used because of their ability to replicate unique, highly time-verified, and highly precise hand-embroidered pieces. In situations where process touch and detail quality are paramount, such as uniform production or decorative embroidery on delicate fabrics, mechanical embroidery machines remain the preferred choice of use.

[0008] Such embroidery machines embody a balance between handcraft and mechanization, allowing embroidery to retain the charm and precision of handcraft while benefiting from the efficiency of mechanization to mass-produce without sacrificing the quality of the finished product.

[0009] Moroccan embroidery is an ancient technique that distinguishes itself by its opulence and diversity, deeply rooted in the country's clothing and religious traditions. Traditional Moroccan garments, such as the kaftan, djellaba, and short-sleeved kaftan, are adorned with intricate embroidery that varies according to religion, city, and even family. Each embroidery tells a story, conveying the unique symbols, beliefs, and cultural elements of each group. These patterns are often inspired by nature, Islamic geometry, or calligraphic symbols, reflecting the influence of Islamic and Andalusian art, which permeates the identity of Moroccans.

[0010] Each region of Morocco has its unique embroidery style, distinguishing different traditional garments. For example, the city of Fez is known for its floral embroidery made with silk thread, creating exquisite and detailed patterns on high-quality fabrics. In contrast, the city of Meknes stands out for its strict geometric patterns, often using gold and silver thread, symbolizing precision and stability. The embroidery of Tetouan is not influenced by Andalusian art, using a specific needle technique to create design patterns reminiscent of Arabesques (vine) style; the embroidery of Rabat combines more abstract designs, emphasizing a more free and contemporary style.

[0011] Embroidered garments occupy a central place in religious and festive events, such as weddings, religious ceremonies, and major celebrations. The hand-embroidered patterns in silk, gold, and silver threads add a special touch of splendor to the garments. These embroideries not only adorn the clothes, but also enhance the spiritual and cultural connection, as each design and the thread used carry a meaning and symbolism. However, due to the intricacy of these embroideries, they require a rare and time-honored handcraft that is passed down from generation to generation. Despite the undeniable beauty of hand-embroidered patterns, modernization and increasing demand have pushed the craft towards embroidery machines. Classic mechanical embroidery machines, such as those used in the mid-19th century, speed up the embroidery process while maintaining a certain level of craftsmanship. However, these machines do not always capture the precision and authenticity of traditional Moroccan patterns, limiting their use to reproducing embroideries for special occasions.

[0012] Therefore, it is extremely important to develop machines specifically designed for Moroccan embroidery. These machines must not only faithfully reproduce complex patterns, but also respect the uniqueness of the region and the technical requirements of each type of embroidery. For example, the tight stitches and exquisite patterns of Fez City embroidery require precise control of thread tension and execution speed, while the abstract design patterns of Rabat City embroidery require more flexibility in stitch selection. Current embroidery machine designs are often used for standard embroidery and cannot meet these specific needs.

[0013] Developing mechanical embroidery machines adapted to Moroccan craftsmanship helps preserve historical heritage while meeting modern production needs. These machines can be equipped with hand-guided systems and mechanical adjustments to help complete complex multi-thread patterns and maintain the authenticity of handcrafted works. Innovations in needle design, rotating shuttle, and transmission action also allow for embroidery with a variety of different fabrics and threads, respecting the techniques and secrets of traditional embroidery.

[0014] For example, Moroccan Patent Application No. 67481, one of the prior art, describes an embroidery machine comprising at least one needle operatively connected to a needle bar to form an embroidery stitch on a fabric; a presser foot guide arm with a U-shaped lower end mounted for vertical movement parallel to the needle bar and slidably housing the needle bar therein. The presser foot guide arm can be synchronized with the needle bar to press the fabric at the point where the needle passes through the fabric; the presser foot guide arm is also mounted for horizontal movement when the needle is raised, moving the fabric by pressing around the needle.

[0015] This embroidery machine includes a gearshift operated using a presser foot slider crank; a series of keyed gears are provided on the main shaft and connected to a carriage; the gearshift interacts with the carriage. This gearshift can engage with the gear set mounted on the main shaft, allowing the operator to adjust the speed and stitch length of the embroidery.

[0016] For example, French Patent No. FR730878 relates to a mechanical embroidery machine driven by a crank, designed to perform flat, satin, and pique stitching. This embroidery machine comprises a special needle capable of lateral jump and simultaneous maintenance of its vertical position. This feature allows the embroidery of complex patterns with adjustable jump amplitude during the operation. This embroidery machine uses a control rod for the lateral displacement of the needle and a specific guide system, which can be adjusted according to the embroidery requirements. In addition, the embroidery machine has a differential mechanism that synchronizes the movement of the needle with the hook to ensure that the tip of the hook is in the correct position relative to the needle.

[0017] British Patent No. GB2121445 describes an embroidery machine that includes a standby mechanism that retracts and resets important components such as the needle, the presser bar support arm, and the presser bar when the embroidery process is paused. This system uses slotted cams and swing levers to synchronize the vertical movement of these components, allowing them to be raised from the work area and returned to the operating position when embroidery is resumed. In addition, this invention includes a mechanism that changes the height of the needle to adjust the stitch length, thus allowing precise control of the consistency of the stitches.

[0018] Finally, US Patent No. US1670978 relates to an improvement in crank-type embroidery, sewing, and lace machines. It is characterized by including a presser foot firmly mounted on a rod that oscillates around two perpendicular axes X-X and Y-Y and is guided by a hinge mounted on a vertical tube for vertical reciprocating movement. The hinge and a solid component ensure smooth movement without jumps, providing stability to the system and preventing unnecessary lateral displacement. This mechanism, based on the principle of a gimbal suspension, allows oscillation around multiple axes while maintaining a fixed point on the vertical axis (Z-Z), thus improving the durability and accuracy of the system while reducing wear. Invention content

[0019] The main purpose of the present invention is to provide a four-thread embroidery machine with an improved structure that allows the box cover structure, the inner lining structure, and the zipper structure to be connected together without using the sewing process, thereby shortening the assembly time of the box cover structure, the inner lining structure, and the zipper structure.

[0020] The present invention relates to an improvement in embroidery machines, particularly designed for Moroccan hand-cranked embroidery and lace sewing. More precisely, the improvement of the present invention aims to synchronize the mechanism and the pivoting component mechanism, allowing the presser foot to move vertically and guide the fabric. This improvement helps multi-thread embroidery, including two embroidery threads or knitting threads and two sewing threads. The purpose of these mechanisms is to increase the number of threads that can be used and modify the embroidery machine components to prevent tangles of embroidery threads under the needle plate, breakage of embroidery threads, and wrinkling of the fabric, while introducing modifications to the needle holder and optimizing the synchronization of parts.

[0021] The present utility model discusses the technical problem that will affect the proper function of the embroidery machine and cause production interruption. One of the most common topics is mechanical jamming, which usually occurs due to poor synchronization of parts or accumulation of embroidery thread in the important area of the machine. This problem will cause the machine to suddenly stop operating, and often requires partial disassembly to identify the source of the problem and remove the jammed moving parts.

[0022] Another common problem that the present utility model aims to solve is the bunching of embroidery thread, characterized by the entanglement of embroidery thread below the needle plate, forming a chaotic mass. This defect is often caused by incorrect embroidery thread tension setting or improper bobbin threading.

[0023] Embroidery thread breakage is also a recurring problem, especially when the embroidery thread quality is poor, the needle is worn out, or the embroidery thread is improperly threaded through the tension guide. Excessive embroidery thread tension or friction with the guide will cause rapid wear and frequent breakage of the embroidery thread.

[0024] Fabric wrinkling is another common defect that the present utility model seeks to solve. Often, when the embroidery thread tension is too high or the fabric is improperly taut, the embroidered product will exhibit a wrinkled or corrugated appearance.

[0025] The technical solution adopted by the present utility model is:

[0026] A four-thread embroidery machine, comprising at least one needle operatively connected to a needle bar to form embroidery stitches on a fabric; a presser foot guide arm parallel to the needle bar, mounted for vertical movement, and the interior of the presser foot guide arm can accommodate a sliding needle bar; the presser foot guide arm and the needle bar can be synchronized by a presser foot guide; characterized in that the four-thread embroidery machine comprises:

[0027] A thread disc mechanism having a shuttle bed guide and two prongs, the shuttle bed guide is fixed to a pivot crank, each prong carries a bobbin, the bobbin is wound with embroidery thread or knitting thread, and can freely rotate on a spindle to unravel the knitting thread; the knitting thread is guided from the bobbin, enters the hole extending downward from the pivot crank through the shuttle bed guide, and descends towards the upper part of the presser foot guide, passes through the guide slot hole in the needle bar long sleeve, and reaches the lower segment of the presser foot ring, then passes through the inclined hole in the lower segment; the lower segment is screwed to the pin guided by the lower part of the presser foot guide arm from the lower end of the presser foot bar section; the pin is provided with a central through hole for the needle and a shaft ring to pass through;

[0028] Four bobbins, two of which are used for embroidery or knitting of embroidery thread bodies and are installed on the thread disc mechanism, and the other two are used for binding the thread bodies of fabric embroidery edge on the fabric installed on the embroidery machine or supplied to the embroidery machine from an external source;

[0029] A shaft rod with an arc cam on it, the arc cam is able to move the presser foot slider crank in the direction of the feed bar; or when the presser foot slider crank is replaced, a spring is used to move the presser foot slider crank in the opposite direction of the feed bar to offset the effect of the presser foot slider crank and eliminate any unnecessary movement; and

[0030] A presser bar support arm with a presser bar with a specific curved section to accommodate the lower edge protrusion of the needle bar long sleeve.

[0031] The four-thread embroidery machine, wherein a main shaft of the four-thread embroidery machine is provided with a main gear; the main gear drives an intermediate gear, the intermediate gear in turn drives a shaft rod and a cam, and the cam is swingingly mounted on a swing rod of a bolt; a lower arm of the swing rod is provided with a slot hole for a bolt to pass through; the bolt is also engaged with a slot hole corresponding to the swing rod swinging around a horizontal shaft.

[0032] The four-thread embroidery machine, wherein the needle bar vertically moves through upper and lower parts, and an upper end thereof includes a pinion gear having upper and lower collars and at least one needle fixed concentrically at a lower end of the needle bar, and the pinion gear is mounted at a middle part of the needle bar; when a feed mechanism pushes a fabric to be embroidered in a horizontal direction, a rotating action of a driving motor or a driving pulley is transmitted to the needle bar through the pinion gear, so that the needle bar rotates toward the fabric to be embroidered.

[0033] The four-thread embroidery machine, wherein the presser bar support arm includes a cross head allowing an upper end of the presser bar support arm to swing around two horizontal shafts, the cross head is provided with two flat surfaces with holes, and centers of the holes are aligned with or parallel to the needle bar located in the center; the other two flat surfaces of the cross head are provided with smooth cylindrical holes, and a component with a trunnion is accommodated and engaged in the smooth cylindrical holes.

[0034] The four-thread embroidery machine, wherein a sleeve shaft and a matched first bevel gear are included; a first gear and a second gear are drivable; the second gear supports a needle plate aligned with an upper surface of a workbench, and the needle plate is aligned with a curved needle matched with the needle in a vertical direction; the curved needle is connected to a vertical shaft rod mounted in a fixed bearing sleeve, and the needle plate is driven in a conventional rotating manner through the second gear and its associated mechanism to match the needle; the curved needle is also actuated in a rotating manner through an axle gear mounted on a seat shaft rod provided with keys in the gear seat, and the seat shaft rod is connected with the first bevel gear and the second bevel gear, and is driven by a handle of a hand crank mechanism.

[0035] The four-thread embroidery machine, wherein a rod of a brake assembly is slidably arranged in a hole of a block; the front end of the block is embedded in a recess and equipped with an arc-shaped support part, and the support part is sleeved on the outer periphery of a shaft ring; a bolt penetrating the support part fastens the block to the shaft ring; a coil spring is arranged in the hole and positioned by an adjustable screw head; the coil spring is engaged with the rear end surface of the rod to elastically resist the retraction of the rod in the hole; the rod is provided with a groove for accommodating an adjusting screw to guide the rod and prevent the rotation of the rod; a stopper is arranged at the end of the rod to resist the screw to keep the rod in the hole; a coil spring is arranged on the outer periphery of the rod and engaged between the brake and the front end of the block to exert an initial tension on the flange.

[0036] The four-thread embroidery machine, wherein the belt driving system is replaced by a motor driving system coupled to the main shaft.

[0037] Compared with the prior art, the first improvement of the utility model is that a spring-loaded thread tensioner is integrated in the system. The tensioner is designed to swing freely around its shaft screw and is installed on the support body fixed on the rack. This structure allows the tensioner to adjust the pressure on the bobbin according to the speed of the bobbin column, ensuring constant thread tension under all working conditions. The tensioner support body is provided with a screw and a spring, which can automatically adjust according to the speed change, providing accurate bobbin pressure control. An adjusting nut is also included, which allows fine adjustment of the bobbin pressure to provide flexibility for specific sewing needs.

[0038] In addition, the embroidery machine of the utility model is equipped with an arm body, which is provided with a cross head designed to allow the upper end of the arm body to swing around two horizontal shafts. The cross head is characterized by two central flat surfaces, each containing a pair of aligned or parallel needle bars. The other two lateral flat surfaces of the cross head are provided with smooth cylindrical holes, which cover a trunnion assembly inserted therein for optimal support.

[0039] The arm body itself has a J-shaped bending pattern, one section of which is designed to accommodate the needle holder. This unique arm body design optimizes needle bar positioning and movement while maintaining substantial mechanical stability, enabling the completion of complex and precise embroidery products.

[0040] In addition, the utility model adopts a new middle tube and needle configuration to solve another problem related to the winding of the stitching thread around the needle. The middle tube has been lengthened and positioned to accurately guide the stitching thread to the thread disc, thereby eliminating the risk of work interruption or sewing defects due to thread winding. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is a perspective view of a preferred embodiment of the embroidery machine of the utility model;

[0042] Figure 2 is a partial front view of the four-thread embroidery machine of the present application;

[0043] Figure 3 is an exploded perspective view of the rotating bobbin post of the embroidery machine of the present application;

[0044] Figure 4 is an assembled perspective view of the rotating bobbin post of the present application;

[0045] Figure 5 is an isometric perspective view of the rotating bobbin post of the present application from another angle;

[0046] Figure 6 is an exploded perspective view of the presser foot rotating mechanism and manual error mechanism of the embroidery machine of the present application;

[0047] Figure 7 、 Figure 8 、 Figure 9 is an exploded perspective view and assembled perspective view of the presser foot drive system of the embroidery machine of the present application;

[0048] Figure 10 is an exploded perspective view of the main shaft and transmission assembly of the embroidery machine of the present application;

[0049] Figure 11 is an exploded perspective view of the needle holding system of the embroidery machine of the present application;

[0050] Figure 12 is a schematic view of the embroidery machine of the present application;

[0051] Figure 13 is an exploded perspective view of the embroidery thread tension system of the embroidery machine of the present application;

[0052] Figure 14 is an exploded perspective view of the shaft guide bearing mechanism below the worktable surface of the embroidery machine of the present application;

[0053] Figure 15 is an exploded perspective view of the transmission mechanism between the system below and above the worktable surface of the embroidery machine of the present application;

[0054] Figure 16 is a practical perspective view of the embroidery machine of the present application;

[0055] Figure 17 is an exploded perspective view of the presser foot of the embroidery machine of the present application;

[0056] Figure 18 is an assembled perspective view of the presser foot of the embroidery machine of the present application.

[0057] Explanation of reference numerals: 1 embroidery machine; 1a machine frame; 100 support console; 101 machine frame; 109 presser foot slider crank; 109a base; 109b first driving point; 120 spring; 121 screw; 13 presser foot guide arm; 130 presser foot guide; 131 presser foot; 132 presser foot ring; 133 shaft collar; 134 shaft pin; 135 presser foot lifting guide; 136 shaft rod; 137 cam with curved surface; 138 intermediate gear; 140 swing lever; 140a pull rod; 141 trunnion; 142 wire guide; 143 wire guide; 145 cross head; 150 swing lever; 151 arm; 2 worktable; 200 fixed bearing sleeve; 201 gear base; 301 helical spring; 302 adjustable screw head; 303 rod body; 304 stopper; 305 block; 3051 support part; 3052 hole diameter; 307 pull rod; 310 bolt; 311 helical spring; 35 cam; 402 belt drive system; 403 main shaft; 404 main gear; 414 main cam; 416 cam; 416a pin; 419 pin; 5 lifting member; 501 control assembly; 502 second gear member; 504 pinion; 506 needle bar long sleeve; 509 shaft collar; 510 needle bar; 511 support body; 512 clamping assembly; 513 machine needle; 520 fork-shaped jaw assembly; 520a needle bar driving cam; 7 thread disc mechanism; 700 spool support; 701 shuttle bed guide; 702 shuttle core; 703 fork; 703' fork; 704 pivoting crank; 705 guide sleeve; 706 gear; 706a gear; 707 shaft rod; 708 shaft rod; 709 shaft rod; 720 cylindrical body; 8 hand-cranking transmission mechanism; 802 gear; 803 gear; 804 gear; 806 first gear; 809 second bevel gear; 810 shaft rod; 811 crank; 812 crank arm; 813 handle; 815 shaft rod; 816 shaft rod; 818 sleeve shaft; 819 seat shaft rod; 820 shaft gear; 821 first bevel gear; 900 vertical shaft rod; 903 second gear; 904 curved needle; 905 needle plate; 906 curved needle; O center point. DETAILED DESCRIPTION

[0058] The advantages and features of the present application will become more apparent with the following description in conjunction with the accompanying drawings.

[0059] The following description provides certain specific details, which are for purposes of explanation and not limitation. It is noted that the present application is not limited to the specific implementations described herein. Rather, one skilled in the art will recognize many modifications and variations that can be made without departing from the spirit of the present application. Thus, it is intended that the present application cover all such modifications and variations as fall within the scope of the present application.

[0060] The details of the present application are related to the accompanying drawings. The embroidery machine perspective view shown in the detailed description of the present application is for better illustration. The example shown in the accompanying drawings can be implemented with general proportions, and is only used to illustrate the present application, but not to limit the scope of protection. In addition, the three-dimensional dimensions of length, width and depth in the drawings are only used as examples.

[0061] In the context of the present description, the term "embroidery" refers to a decorative technique in which various decorative patterns are added to textiles using embroidery thread (such as embroidery thread or knitting thread) to beautify them. These patterns are created using mechanical means to perform specific needlework to create intricate designs.

[0062] Referring to the drawings, the present application relates to an embroidery machine designed to produce complex decorative embroidery patterns on various textiles. The center of operation of the embroidery machine is an arm that allows work on the surface of the fabric while facilitating precise control of the embroidery thread. The height-adjustable presser foot firmly fixes the fabric in place, ensuring proper tension to achieve uniform embroidery.

[0063] The present application provides a solution that integrates several mechanisms to improve existing embroidery machines, particularly a crankshaft-type sewing machine that uses four threads and is equipped with a drive mechanism to sew decorative hems on fabrics.

[0064] The present application provides a means to easily adjust the driving action amplitude regardless of the driving direction. The present application also provides an improved way to carry and actuate the presser foot and lifting assembly to allow easy adjustment of the pressure exerted by the presser foot and lifting assembly on the embroidery thread.

[0065] Referring to Figures 1-18 As shown, the embroidery machine according to the first embodiment of the present application includes a hinge or crosshead 145. This hinge or crosshead 145 allows the presser foot guide 130, which is driven to perform reciprocating motion, to oscillate around two orthogonal axes and another two intermediate axes when it slides on a needle bar long sleeve 506 to perform its up and down and guiding actions. The crosshead 145 is characterized by having a housing with two cylindrical or spherical surfaces or a flat surface with a truncated spherical portion, and two flat surfaces with smooth cylindrical holes. The housing contains a component with two cylindrical surfaces and two flat surfaces, and is provided with trunnions 141 that can engage with the smooth cylindrical holes.

[0066] In the first embodiment, the crosshead 145 has two smooth holes; the screw of the presser foot guide 130 has a cylindrical end that engages with the smooth holes to allow the presser foot guide 130 to pivot around the X-X' axis. The crosshead 145 is pivoted by a bearing in which the cylindrical shaft of the pivoting component rotates. The bearing is firmly fixed to the vertically movable sliding presser foot guide 130.

[0067] The cross head 145 has a recessed portion with two symmetrically arranged partial cylindrical surfaces and two flat surfaces.

[0068] It should be noted that in this structure, the cross head assembly cannot move along the Y-Y axis or the X-X axis when it swings around the X-X axis and the other intermediate axes, and the center point O will always remain on the Z-Z axis when the pivot block performs vertical reciprocating motion due to machine operation.

[0069] Please refer to Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 13 , which shows the first embodiment of the present application, including a support console 100, which is provided with a plurality of rectangular grooves to accommodate mechanical components. The support console 100 includes an upper part 101 and a lower part. The upper and lower parts support a vertically movable needle bar 510, which includes a pinion 504 with an upper collar and a lower collar at the upper end, and at least one needle 513 fixed concentrically at the lower end. The pinion 504 is installed at the central part of the needle bar 510. When the fabric to be embroidered is pushed horizontally forward by a fabric feeding mechanism, the rotation of a driving motor or a driving pulley is transmitted to the needle bar 510 through the pinion 504, causing the needle bar to rotate towards the fabric to be embroidered. A presser foot lifting guide 135 is provided at the rear of the upper end of the needle bar 510, and a presser foot slider crank 109 of a vertically movable lifting assembly is installed at the front end of the presser foot lifting guide 135. The presser foot slider crank 109 includes a base 109a, a first driving point 109b extending transversely from the upper end, and a fork-shaped clamping jaw assembly 520 that can protrude to contact and produce a clamping effect. A horizontally rotatable main cam 414 is installed on the support body. The rear end of the main cam 414 is provided with a pin 419 to contact the upper surface of the needle bar driving cam 520a.

[0070] Please refer to Figure 7 、 Figure 10 、 Figure 11As shown, according to this configuration, when the main shaft 403 of the embroidery machine is continuously rotated, it drives the main cam 414 to perform a rotating motion, which is converted by the pin 419 into vertical movement of the lifting member 5, and the needle 513 is vertically moved by the lifting member 5. The upper and lower parts of the support console 100 support a vertically movable needle bar long sleeve 506, which is parallel to the right needle bar 510. The upper end of the needle bar long sleeve 506 is fixed with a second gear member 502. The front end of the shaft 136 is provided with an arc cam 137, and a swing rod can swing under the action of the arc cam 137.

[0071] As shown in the figures, Figure 6 , Figure 12 , Figure 15 As shown, the gear transmission mechanism includes a sleeve shaft 818 and a matching bevel gear 821; the bevel gear 821 can drive the first gear 806 and the second gear 903. The second gear 903 supports a needle plate 905, which is aligned with the upper surface of the workbench 2, and vertically corresponds to the curved needle 906 cooperating with the needle 513. The curved needle 906 is connected with a vertical shaft 900 installed in a fixed bearing sleeve 200. In the two examples shown in the figures, the needle plate 905 is driven in the existing rotating mode by cooperating with the needle through the second gear 903 and its associated mechanism; the curved needle 906 is driven by the shaft gear 820 installed on the shaft set in the gear base 201. The seat shaft 819 is provided with a protruding key which can engage with the second bevel gear 809 and the first bevel gear 821, and is driven by the handle 813 of the hand-operated transmission mechanism 8.

[0072] As shown in the figures, Figure 6 , Figure 10 , Figure 12 , Figure 15 As shown in the above configuration, when the sleeve shaft 818 is rotated by using the handle 813, in addition to rotating the needle bar long sleeve 506 and the retaining assembly around its axis to adjust the needle 513 as needed, it allows the direction of the embroidery stitch to be changed, and the support ring and the curved needle 906 are operated synchronously. When the seat shaft 819 is reciprocated by the main shaft 403 driving the mechanism shown in the figures, the curved needle 906 can work with the needle 513 during embroidery sewing to produce embroidery stitches. It should be understood that the above-mentioned machine form includes a presser bar 130 or an associated mechanism which can be of the existing type and operated in the existing manner, and works correctly with the rest of the machine mechanism shown in the figures. In the preferred configuration, as shown in the figures, the presser bar 130 is installed on the machine by using a ball joint, through which the presser bar 130 can be properly synchronized with the associated mechanism to raise and lower the presser foot 131.

[0073] As shown in the figures, Figure 11As previously indicated, the needle 513 passes downward through the clamping assembly and has a considerable length due to the presence of the support body; the support body 511 of the needle 513 is clamped only at its upper end by the clamping assembly 512. The needle 513 is shown in the example as a sewing needle, and the lower end of the needle 513 slides through a guide which is part of, or is mounted on, the adjustable support body. This sliding joint can be an open dovetail joint, which is secured in the adjusted position by means of a screw, which can be used to clamp the joint in the dovetail slot. This joint is flat and is secured in the adjusted position by means of one or more adjusting screws. In any case, the needle mounting head can be provided with an annular flange; the flange can slide onto a collar 509 and is secured in this position by means of, for example, an adjusting screw, the collar 509 itself being secured in a needle bar long sleeve 506 by means of an adjusting screw.

[0074] Referring to Figure 10 , Figure 12 , Figure 17 During operation of the above-described embroidery machine, power can be supplied from any suitable source to the belt drive system 402 to rotate the main shaft 403, and thus the presser bar 130 and the needle 513 supported thereby, in a reciprocating motion in the vertical direction relative to the needle bar 510. At the same time, the needle plate 905 and the beak 904 are suitably actuated in synchronism with the needle 513 to form the embroidery stitches.

[0075] Referring to Figure 11 , Figure 17 During the above-described operation, the needle guide, the associated components, the presser bar arm and the presser foot 131 are raised and lowered in synchronism with the operation of the needle 513. At the same time, the presser bar 130 is actuated in the usual manner in conjunction with the above-described components. When the needle bar long sleeve 506 is moved up and down during these operations, the presser bar 130 is moved up and down in response, and its motion is transmitted to the presser bar lift guide 135 and the presser foot slider crank 109.

[0076] Referring to Figure 3 , Figure 10 , Figure 11 , Figure 13 , Figure 18The cam 416 cooperates with the pin 416a to tilt the pull rod 307, and thus control the embroidery thread passing through the hole of the pull rod 307. Meanwhile, the auxiliary lift installed on the support body is involved in the rotating action through the gear 706 of the support body, and cooperates with the lift rod action to properly control the embroidery thread according to the spacing of the needles 513. It is to be understood that the embroidery machine can be equipped with multiple mutually spaced needles. The needle spacing refers to the spacing of the lower end of the needle in operation. As long as the handle 813 is not operated, the embroidery stitches generated by the embroidery machine will extend in a specified direction in a straight line. If the hand rotating mechanism is manually rotated, the mechanism driven by the handle 813 will rotate the presser bar arm 13 and the presser foot 131 together with the needles 513, change the direction of the aforementioned embroidery stitches, and allow the stitches to be formed along an arc or other directions deviating from a straight line.

[0077] In a preferred embodiment of the present application, the overcasting thread can be wound on the periphery of the embroidery thread or the knitting thread under tension to form a decorative thick thread. In such a conventional embroidery machine, the tension of the overcasting thread wound on the embroidery thread is maintained at a constant value, so that the thickness or diameter of the entire length of the generated thick thread is consistent.

[0078] Another advantage of the present application is that when performing the overcasting thread winding operation, the tension of the overcasting thread is automatically changed at fixed time intervals, so that the decorative thick thread formed has a variable thickness or diameter along its entire length.

[0079] However, the present application can be applied to other types of embroidery machines using overcasting thread to wind embroidery thread to form a decorative thick thread. It is to be understood that the term "embroidery thread" used in the present application is broad, and thus includes sewing thread and other threads used for buried thread. The phrase "two or three thread overcasting" is used to describe such machines.

[0080] Referring to Figure 3 , Referring to Figure 11 , the machine embroidery of the present application also includes a spool mechanism 7, which has a shuttle bed guide rod 701 connected to the pivot crank 704 to support two fork portions 703, 703'. Each fork portion carries a bobbin 702, on which embroidery thread or knitting thread is wound. The bobbin is freely rotatable on the winding rod, unwinds the knitting thread, and can be removed from the fork portion together with the embroidery thread or knitting thread. The knitting thread is guided from the bobbin through a shuttle bed guide rod 701, enters an opening extending downward from the pivot crank 704, descends toward the upper part of the presser bar 130, and extends downward along a guide bushing; the guide bushing is locked into a pin guided by the lower part of the presser bar arm. The pin is provided with a central hole for the needle and a shaft ring.

[0081] Referring to Figure 8 , Figure 11A spring 120 is provided between the collar 133 of the tube joint and the flange of the upper end of the presser bar guide 135 (the guide bushing is pressed against the lower end of the presser bar), and the spring 120 acts as a buffer spring of the tube joint and can be adjusted according to the operation requirements to continuously push the knitting line forward. The lower section of the presser bar guide 130 is guided by the sleeve-shaped upper end portion in the upper portion of the presser bar guide 130, and the upper portion of the presser bar guide 130 is clamped to the needle bar by the shaft pin 134. The aforementioned lower section is retracted when the needle bar is lowered; and the lower section is moved downward under the influence of gravity when the needle bar is raised. The needle passes through the center of the knitting line and uniformly places the knitting line on the fabric. The knitting line is guided along the needle bar, the presser bar 131 and the tube joint and is developed by the latter and the fabric advancing mechanism of the embroidery machine.

[0082] Referring to Figure 13 As shown, the rod body 303 of the brake assembly is slidably arranged in the hole 3052 of a block 305. The block is embedded in the front end and is provided with an arc-shaped extension support 3051, which is formed with a recess and a support portion for sleeving the outer periphery of a collar. A bolt 310 penetrating through the support 3051 penetrates and fastens the block 305 to the collar. A coil spring 301 is installed in the hole 3052 and is positioned by a screw head 302. The coil spring 301 is in engagement with the rear end face of the rod body 303 and elastically resists the retraction of the rod body in the hole when the brake engages the flange. The rod body 303 is provided with a groove for accommodating an adjusting screw for guiding the rod body and preventing the rotation of the rod body. The stopper 304 is arranged at the end of the rod body and is stopped by the screw to allow the rod body to be retained in the hole 3052. A relatively light coil spring 311 is arranged on the outer periphery of the rod body 303 and is engaged between the brake and the front end of the block to apply an initial tension to the flange.

[0083] When the edge line is sewn along the periphery of the fabric, the embroidery thread is pulled out from the bobbin according to the constant tension set by the existing tension joint. During the partial rotation of the bobbin, the outer protruding periphery of the flange engages the brake assembly, and the brake assembly elastically resists the rotation of the bobbin. When the brake initially engages, the light resistance of the coil spring 311 to the retraction of the rod body 303 gradually slows down the rotation of the bobbin. Therefore, when the edge line is sewn along the periphery of the fabric, only a slight constraint is applied to the edge line, so that the edge line is more tightly wrapped around the periphery of the fabric edge in a gradually thinning manner.

[0084] In a preferred embodiment of the present application, the embroidery machine 1 comprises a driving rod; the driving rod carries a movable fabric feeding foot and is arranged to use the fabric feeding presser foot slider crank to control the fabric feeding foot in a normal manner. A feature of the present application is a cam assembly for actuating the fabric feeding presser foot slider crank; the cam assembly is provided with a plurality of cam surfaces with continuously changing inclination angles and can be cyclically adjusted so that the cam surface engaged by the fabric feeding presser foot slider crank can transmit the desired movement amplitude to the fabric feeding foot.

[0085] The lifting assembly of the drive rod is carried by an axially movable tubular rod or slide presser guide arm, which contains a spring whose pressure can be adjusted by a suitable plug adjuster. This assembly is actuated in a single positive direction by a cam mounted on the control shaft of the embroidery machine and is returned by the spring.

[0086] Referring to Figure 11 The lifting member 5 carrying the machine needle 513 is limited to rotation and vertical movement within a cylindrical body as in the prior art. The lifting member 5 is provided with a circumferential slotted needle bar long sleeve 506 which slides on the cylindrical body and is clamped by the forked end of a forked jaw assembly 520 extending from the control assembly 501, and the lifting member 5 slides vertically within the guide of the frame 101. The control assembly 501 receives a reciprocating motion in the prior manner.

[0087] Referring to Figure 3 , Figure 4 , Figure 5 The machine needle cooperates with a thread disc mechanism 7. The thread disc mechanism 7 is carried by a guide sleeve 705 which rotates with a gear 706 which engages a shaft 707 guided in the guide sleeve 705. The shaft 708 is a shaft body which pivots in the support console 100 of the embroidery machine.

[0088] Referring to Figure 3 , Figure 6 The crank arm 812 rotates in a bearing below the worktable 2 and carries a crank 811. The crank 811 is operated to manually rotate the cylindrical body 720 and the guide sleeve 705. The shaft 810 engages a shaft 815 via a gear, which engages a shaft 816 via a gear 802. The shaft 810 carries a gear 803 which engages a gear 804, so that the sleeve can be rotated without affecting the action of the swinging hook to pick up the loop. The shaft 810 drives the shaft 708 to pivot in the arm via a plurality of engaged gears. The shafts 708, 709 carry a gear 706 which engages a gear 706a mounted to pivot about the axis XX' by an eccentric crank at its end, allowing the swinging shuttle bed guide 701 to rotate.

[0089] Referring to Figure 7 , Figure 8 , Figure 10As shown, the embroidery machine main shaft 403 is provided with a gear 404 to drive the intermediate gear 138, which in turn drives the shaft rod 136 and the cam 35, while the cam causes the swing rod 140 mounted on the bolt to swing. The lower arm of the pull rod 140a is provided with a slot hole for a bolt to pass through; the bolt is also engaged with the corresponding slot hole on the swing rod 140 around the horizontal axis. After adjusting the bolt in the slot hole, the swing of the pull rod 140a can be adjusted from zero to maximum. The other end of the pull rod 140a transmits a reciprocating motion to the slider, which is provided with a fork to engage the groove in the support console 100, allowing the slider to move up and down on the support console 100. The spacing wedge on the support console 100 can be adjusted by the screw 121 passing through the groove on the spacing wedge.

[0090] Please refer to Figure 7 、 Figure 8 、 Figure 9 As shown, the shaft rod 136 is provided with an arc cam 137, which can actuate the presser foot slider crank 109 in the direction of the feed rod 150; or when the replacement presser foot slider crank 109 is started, it can actuate the presser foot slider crank 109 in the opposite direction of the feed rod 150 with the assistance of the spring 120. To offset the effect of the presser foot slider crank 109 and thereby suppress any unnecessary movement, a shaft pin 134 can be provided to allow the arm 151 to swing.

[0091] The bobbin holder 700 is mounted on the frame 1a and is provided with a plurality of rotating bobbins; through this holder, the rotation of the embroidery thread around the hole can be adjusted according to different positions.

[0092] The above description is only illustrative and not limiting, and those skilled in the art can understand that many modifications, changes or equivalents can be made without departing from the spirit and scope of the technical concept defined, but all will fall within the protection scope of the present application.

Claims

1. A four-thread embroidery machine comprising at least one needle (513) operably connected to a needle bar (510) for forming embroidery stitches on a fabric; a presser foot guide arm (13) parallel to the needle bar (510), mounted to be vertically movable, wherein the presser foot guide arm (13) contains a sliding needle bar; the presser foot guide arm (13) and the needle bar (510) are synchronously pressed via the presser foot guide arm (130); characterized in that, The four-thread embroidery machine includes: A single-line mechanism (7) has a shuttle bed guide rod (701) and two forks (703, 703'). The shuttle bed guide rod (701) is fixed to a pivot crank (704). Each fork carries a bobbin (702). Embroidery thread or braided thread is wound on the bobbin (702), and it can rotate freely on a spindle to untangle the braided thread. The braided thread is led out from the bobbin (702), enters the pivot crank via the shuttle bed guide rod (701), and then enters the pivot crank. The crank (704) extends downward through an opening and descends towards the upper part of a presser foot guide rod (130). It then descends along the longitudinal recess in the needle bar sleeve (506) through the guide slot in the guide wire section (143, 142) to the lower section of the presser foot ring (132), and then through the oblique hole in the lower section. The lower section is screwed from the lower end of the presser foot bar section to a pin that guides the lower part of the presser foot guide rod support arm (13). The pin has a central through hole for the needle and a collar to pass through. Four bobbins (702), two of which are used for embroidering or braiding embroidery thread and are mounted on the thread reel mechanism (7), and the other two bobbins (702) are used for binding the embroidery thread of the fabric to the fabric mounted on the embroidery machine (1) or supplied to the embroidery machine (1) from an external source; A shaft (136) has an arc-shaped cam (137) mounted thereon, the arc-shaped cam (137) being able to move the presser foot slider crank (109) along the feed rod (150); or, if starting to replace the presser foot slider crank, a spring (120) can be used to move the presser foot slider crank (109) in the opposite direction along the feed rod (150) to counteract the influence of the presser foot slider crank (109) and eliminate any unnecessary movement; and A presser foot guide arm (13) has a presser foot guide (130) with a specific curved section for accommodating the lower edge protrusion of the needle bar sleeve (506).

2. The four-thread embroidery machine according to claim 1, characterized in that, The main shaft (403) of the four-thread embroidery machine is provided with a main gear (404); the main gear (404) drives an intermediate gear (138), which in turn drives the shaft (136) and the cam (35), and the cam (35) swings the swing rod (140) mounted on the bolt; the lower arm of the pull rod (140a) is provided with a slot for a bolt to pass through; the bolt also engages with the slot provided in the swing rod (140) that swings around the horizontal axis.

3. The four-thread embroidery machine according to claim 2, characterized in that, The needle bar (510) moves vertically through the upper and lower parts, and its upper end includes a small gear (504) with upper and lower collars and at least one needle (513) concentrically fixed to the lower end of the needle bar (510). The small gear (504) is installed in the middle part of the needle bar (510). When a fabric feeding mechanism pushes the fabric to be embroidered in the horizontal direction, the rotation of a drive motor or drive pulley is transmitted to the needle bar (510) via the small gear (504), causing the needle bar (510) to rotate toward the fabric to be embroidered.

4. The four-thread embroidery machine according to claim 1, characterized in that, The presser foot guide arm (13) includes a crosshead (145) that allows the upper end of the presser foot guide arm (13) to swing around two horizontal axes. The crosshead (145) has two flat surfaces with holes, the central axis of which is aligned or parallel to the needle bar (510) located in the center. The other two flat sides of the crosshead (145) have smooth cylindrical holes, and the smooth cylindrical holes contain and engage an assembly with a trunnion (141).

5. The four-thread embroidery machine according to claim 1, characterized in that, Includes a cylindrical shaft (818) and a mating first bevel gear (821); capable of driving the first gear (806) and the second gear (903); the second gear (903) supports a needle plate (905) aligned with the upper surface of an alignment table (2), and the needle plate (905) is vertically aligned with a bent needle (906) that mates with a machine needle (513); the bent needle (906) is connected to a vertical shaft (900) mounted in a fixed bearing sleeve (200), and The needle plate (905) is driven in the existing rotational manner via the second gear (903) and its associated mechanism to cooperate with the needle; the bent needle (906) is also actuated in the rotational manner via the shaft gear (820) mounted on the seat shaft (819) which is axially mounted in the gear seat (201), wherein the seat shaft (819) is provided with key teeth to connect with the aforementioned first bevel gear (821) and second bevel gear (809), and is driven by the handle (813) of the hand crank transmission mechanism (8).

6. The four-thread embroidery machine according to claim 1, characterized in that, A rod (303) of a braking assembly is slidably disposed within a bore (3052) of a block (305); the front end of the block is embedded in a recess and equipped with an arc-shaped extending support (3051), and the support (3051) is used to fit around the outer periphery of a collar, and a bolt (310) penetrating the support (3051) secures the block (305) to the collar; a helical spring (301) is installed within the bore (3052) and is held and positioned by an adjustable helical plug (302); the helical spring (3052) is further positioned within the bore (3052). 1) Engages with the rear end face of the rod (303) to elastically resist the retraction of the rod (303) within the bore; the rod (303) is provided with a groove to accommodate an adjusting screw to guide the rod (303) and prevent the rod (303) from rotating; the stop (304) abuts against the screw at the end of the rod to keep the rod (303) within the bore (3052); a helical spring (311) is provided on the outer periphery of the rod (303) and engages between the brake and the front end of the block to apply an initial tension to the flange.

7. The four-thread embroidery machine according to claim 1, characterized in that, The belt drive system (402) can be replaced by a motor drive system coupled to the spindle (403).

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