An embroidery frame for tensioning embroidery materials

Abstract

The present invention discloses an embroidery frame for tensioning embroidery materials, which includes a main frame formed by sequentially connecting four side frames end to end; there is one auxiliary baffle arranged at an interval with one of the side frames inside the main frame, or two auxiliary baffles respectively arranged at intervals with two opposite side frames; a plurality of tensioning devices are connected between the side frames and the auxiliary baffles arranged at intervals; the tensioning device includes a fixed seat, a sliding seat, at least one sliding rod, and a driving mechanism; the fixed seat and the sliding seat are respectively arranged on the auxiliary baffle and the side frame, or the side frame and the auxiliary baffle; one end of the sliding rod is fixedly connected to the fixed seat, and the other end can slide axially through the sliding seat; the driving mechanism can drive the sliding rod to slide, so that the distance between the auxiliary baffle and the side frame is reduced to a preset minimum threshold and maintained. The beneficial effects of the present invention are as follows.

Description

Technical Field

[0001] The present invention relates to an embroidery frame, especially an embroidery frame for tensioning embroidery materials. Background Art

[0002] The embroidery frame of an embroidery machine is used to fixedly clamp the embroidery material, which is a rectangular structure formed by connecting four side frames. The four sides of the embroidery material are clamped by the thread clamping structure arranged on the side frames or the thread grooves arranged on the inner sides of the side frames. The quality of embroidery has a great relationship with the flatness and tension of the embroidery material. The existing embroidery frames have disadvantages in this regard.

[0003] Based on the above disadvantages, the patent with the publication number CN206457619U discloses a flat embroidery machine and an embroidery paper fixing mechanism. When installing the backing paper, first disassemble the vertical connecting cloth and the horizontal connecting cloth, and respectively sew and connect them to the four side edges of the backing paper. After the connection is completed, then install the vertical connecting cloth and the horizontal connecting cloth onto the upper frame, lower frame, left frame, and right frame in sequence. When installing the two horizontal connecting cloths onto the left frame and the right frame, first complete the installation of one horizontal connecting cloth, then tighten the backing paper and buckle the other horizontal connecting cloth into the staple nails to directly tighten the backing paper horizontally. After the installation is completed, control the tensioning roller to rotate to tighten the backing paper vertically to achieve the installation and flattening of the backing paper. This embroidery paper fixing mechanism has the following defects: the steps of installing the backing paper are relatively cumbersome, and the tension of the backing paper depends on the connection strength between the hook surface adhesive tape and the rough surface of the vertical connecting cloth. During the embroidery process, when the embroidery needle pierces into the backing paper, it will generate a pulling force on the backing paper pointing to the embroidery position, which easily damages the connection between the hook surface and the vertical connecting cloth and cannot ensure the flatness and tension.

[0004] Another example is the patent with the publication number CN208604323U, which discloses an embroidery machine and its embroidery frame, including an outer frame, an inner frame, a stretching device, and a clamping device. Among them, the outer frame is used to fix the embroidery frame to the embroidery machine and provide an installation position and support for other parts of the embroidery frame; the inner frame is composed of multiple independent frame bars, and each frame bar is located inside the outer frame, and preferably each frame bar can be evenly distributed along the circumferential direction of the inner side of the outer frame. Each frame bar is respectively connected to the outer frame through a stretching device, and the stretching device is used to drive the frame bar to approach or move away from the outer frame; the clamping device is arranged on the frame bar and is used to cooperate with the frame bar to clamp the embroidery cloth. Although this embroidery frame can tighten the embroidery cloth by pulling the inner frame through the stretching device to improve the embroidery quality, during embroidery, when the embroidery needle pierces into the embroidery cloth, it will generate a pulling force on the embroidery cloth pointing to the embroidery position, which will generate an inward pulling force on the inner frame, thereby reducing the tension of the embroidery cloth and still having a negative impact on the embroidery quality. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an embroidery frame for tensioning embroidery materials, which can maintain the tension state of the embroidery cloth while tensioning the embroidery cloth, thereby improving the quality of embroidery.

[0006] The present invention is achieved through the following technical solutions.

[0007] An embroidery frame for tensioning embroidery fabric includes a main frame formed by sequentially connecting four side frames end to end; within the main frame, there is one auxiliary partition arranged at an interval from one of the side frames, or two auxiliary partitions respectively arranged at intervals from two opposite side frames; a plurality of tensioning devices are connected between the spaced side frames and auxiliary partitions; the tensioning device includes a fixed seat, a sliding seat, at least one sliding rod, and a driving mechanism; the fixed seat and the sliding seat are respectively arranged on the auxiliary partition and the side frame, or the side frame and the auxiliary partition; one end of the sliding rod is fixedly connected to the fixed seat, and the other end can slide axially through the sliding seat; the driving mechanism can drive the sliding rod to slide, so that the distance between the auxiliary partition and the side frame is reduced to a preset minimum threshold and maintained.

[0008] As a further improvement of the present invention, the locking mechanism includes a first driving cylinder; the first driving cylinder is arranged on the auxiliary partition or the side frame, and its piston rod is parallel to the sliding rod, and the two are directly or indirectly fixedly connected; the sliding rod is provided with a first limiting structure. When the first driving cylinder drives the sliding rod to slide and the distance between the auxiliary partition and the side frame is reduced to the preset minimum threshold, the first limiting structure abuts against the sliding seat to prevent the sliding rod from continuing to slide.

[0009] As a further improvement of the present invention, an elastic buffer layer is attached to the end face of the first limiting structure facing the sliding seat.

[0010] As a further improvement of the present invention, a maximum threshold is preset for the distance between the side frame and the auxiliary partition; the sliding rod is provided with a second limiting structure. When the first driving cylinder drives the sliding rod to slide and the distance between the auxiliary partition and the side frame is increased to the preset maximum threshold, the second limiting structure abuts against the sliding seat to prevent the sliding rod from continuing to slide.

[0011] As a further improvement of the present invention, the first driving cylinder and the sliding seat are both arranged on the auxiliary partition or the side frame, and the two are of an integral structure.

[0012] As a further improvement of the present invention, the driving mechanism includes a first link structure and a second link that are hinged; the first link structure is directly or indirectly hinged to the side frame to form a first hinge point, and the second link structure is directly or indirectly hinged to the auxiliary partition or the sliding rod to form a second hinge point; by rotating the first link structure and the second link structure, when the distance between the first hinge point and the second hinge point reaches the maximum or minimum value, the distance between the auxiliary partition and the side frame is reduced to the preset minimum threshold.

[0013] As a further improvement of the present invention, the first link structure and the second link structure rotate within a vertical range.

[0014] As a further improvement of the present invention, the first link structure includes two supports, two support plates, and a rotating shaft; the two supports are fixedly arranged on the side frame at intervals, the two support plates are respectively hinged to the two supports, and both ends of the rotating shaft are rotatably connected to the two support plates so that the rotating shaft can rotate around its axis; the second link structure is connected to the rotating shaft.

[0015] As a further improvement of the present invention, a handle is connected between the two support plates.

[0016] As a further improvement of the present invention, the second link structure penetrates through the rotating shaft, and two nuts are threadedly sleeved to clamp and fix the rotating shaft.

[0017] As a further improvement of the present invention, the sliding seat is arranged on the side frame, and the fixed seat is arranged on the auxiliary gear; the support is located on the side of the sliding seat facing away from the fixed seat, and a straight groove is formed at the top of the sliding seat to avoid the second link structure; the second link structure is hinged to the sliding seat.

[0018] As a further improvement of the present invention, the first link structure and the second link structure rotate within a horizontal range.

[0019] As a further improvement of the present invention, a swing structure is integrally connected to the first link structure or the second link structure.

[0020] As a further improvement of the present invention, the drive mechanism further includes a second drive cylinder, the second drive cylinder is hinged to the side frame and can rotate within a horizontal range, and the piston rod of the second drive cylinder is hinged to the swing structure.

[0021] As a further improvement of the present invention, the sliding seat is arranged on the side frame, and the fixed seat is arranged on the auxiliary gear; the first link structure is hinged to the sliding seat; a detachable connecting seat is sleeved on the sliding rod, and the second link structure is hinged to the connecting seat.

[0022] As a further improvement of the present invention, the part of the sliding rod passing through the sliding seat is sleeved with the connecting seat.

[0023] As a further improvement of the present invention, the auxiliary gear is arranged at an interval from the longer side frame.

[0024] As a further improvement of the present invention, limiting structures extending outward to both sides are provided at both ends of the auxiliary gear, and the limiting structures are abutted against the corresponding side frames.

[0025] Advantages of the present invention:

[0026] The present invention pulls the auxiliary frame through a tensioning device, so that the distance between the auxiliary frame and the side frame is reduced to a preset minimum threshold, and this minimum threshold is maintained during the embroidery process, so that the embroidery material is always in a tensioned state, improving the stability of embroidery and the quality of embroidery. Description of the Drawings

[0027] Figure 1 Schematic structural diagram of the embroidery frame for tensioning the embroidery material in Embodiment 1;

[0028] Figure 2 Schematic structural diagram of the tensioning device in Embodiment 1;

[0029] Figure 3 Schematic structural diagram of the tensioning device in another perspective in Embodiment 1;

[0030] Figure 4 Schematic structural diagram of the tensioning device in Embodiment 2;

[0031] Figure 5 Schematic structural diagram of the tensioning device in Embodiment 3. Detailed Embodiments

[0032] The present invention will be further described in detail below with reference to the drawings and embodiments.

[0033] Embodiment 1:

[0034] Referring to Figures 1 - 3 , an embroidery frame for tensioning the embroidery material includes a main frame formed by connecting four side frames end to end in sequence. The main frame is in the shape of a rectangular structure with different lengths, which is basically the same as the prior art. The side frames are made of aluminum alloy profiles and are cut at their two ends using cutting equipment, and then the four side frames are adjacently spliced and fixedly connected using fasteners such as screws.

[0035] Combined with Figure 1 shown, the main frame has two longer side frames and two shorter side frames. The longer side frames are denoted as X-direction side frames 11, and the shorter side frames are denoted as Y-direction side frames 12. There is an auxiliary frame 13 arranged at an interval from one of the X-direction side frames 11 inside the main frame. The width of the auxiliary frame 13 is slightly narrower than that of the X-direction side frame 11, and the length of the auxiliary frame 13 is slightly smaller than the distance between the two Y-direction side frames 12. The auxiliary frame 13, the two Y-direction side frames 12, and the X-direction side frame 11 opposite to the auxiliary frame 13 are respectively used to clamp the four sides of the embroidery material. As for how these three clamp the embroidery material, it is the prior art. Clamping structures for clamping the embroidery material can be provided on the auxiliary frame 13, the Y-direction side frames 12, and the X-direction side frame 11, or grooves with clamping functions can be opened on the sides of these three facing the embroidery material to clamp the embroidery material.

[0036] A plurality of tensioning devices 2 are connected between the spaced-apart secondary brackets 13 and the X-direction side frames 11. The tensioning device 2 includes a fixed seat 21, a sliding seat 22, a sliding rod 23, and a driving mechanism. The fixed seat 21 and the sliding seat 22 are respectively installed on the secondary bracket 13 and the X-direction side frame 11. The fixed seat 21 generally presents a block structure protruding from the top surface of the secondary bracket 13 and extends a certain length in the length direction of the secondary bracket 13. Both ends thereof respectively have vertically penetrating mounting holes, and mating holes are pre-drilled at corresponding positions on the secondary bracket 13. The fixed seat 21 is fixedly installed on the top surface of the secondary bracket 13 through fasteners such as screws. The sliding seat 22 has a similar structure and is fixed to the top surface of the X-direction side frame 11 in the same manner. The number of sliding rods 23 is set according to actual requirements and is set to two in this embodiment. The sliding rods 23 are basically horizontal and arranged in the Y direction. One end of the sliding rod 23 is fixedly connected to the fixed seat 21. The sliding rod 23 can penetrate the fixed seat 21 in the Y direction and the two are in interference fit. A holding hoop 23-1 that fits on the fixed seat 21 is sleeved on the end of the sliding rod 23 that penetrates the fixed seat 21. When the sliding rod 23 is subjected to a pulling force from the direction of the sliding seat 22, the acting force of the holding hoop 23-1 against the fixed seat 21 and the high frictional force generated by the interference fit between the fixed seat 21 and the sliding rod 23 jointly maintain the fixed connection state between the sliding rod 23 and the fixed seat 21 and prevent the sliding rod 23 from slipping off the fixed seat 21 along its axial direction; the other end of the sliding rod 23 penetrates the sliding seat 22 in the Y direction and can slide through the sliding seat 22. Some lubricating oil can be appropriately applied to the part of the sliding rod 23 that penetrates the sliding seat 22 to reduce the frictional loss between the sliding rod 23 and the sliding seat 22.

[0037] The driving mechanism includes a first driving cylinder 31. A hydraulic cylinder, a pneumatic cylinder, or an electric cylinder can be used. In comparison, the pneumatic cylinder has a simpler structure, lower failure rate, and longer service life, which conforms to the characteristics of high-frequency use times in the embroidery field; the air compression ratio of the pneumatic cylinder is greater than that of the hydraulic cylinder, so its working stability and better response; the output force of the pneumatic cylinder is also relatively large. Although the accuracy is not as good as that of the electric cylinder, with the following first limiting structure 32 and second limiting structure, this defect can also be solved. Therefore, the pneumatic cylinder is the preferred solution. The first driving cylinder 31 is arranged on the X-direction side frame 11 and is an integral structure with the sliding seat 22. In fact, the base of the first driving cylinder 31 in this embodiment is larger than that of a conventional driving cylinder. Structurally, it extends and expands to both sides in the X direction, and the equipment drills a channel allowing the sliding rod 23 to slide through in the extended part, thus forming an integral overall structure with the first driving cylinder 31 in the middle and the sliding seat 22 on both sides.

[0038] A connecting structure 23-A is fixedly sleeved on the parts of two sliding rods 23 passing through the sliding seat 22. The connecting structure 23-A presents a plate-like structure or a block-like structure extending along the X direction in terms of structure. It connects the two sliding rods 23, making their axial sliding completely synchronous and avoiding the situation of jamming caused by the misalignment of the two sliding rods 23 in the axial direction. The output end of the first driving cylinder 31 faces away from the fixed seat 21. The piston rod 311 assembled at the output end is parallel to the two sliding rods 23, and the piston rod 311 is fixedly connected to the connecting structure 23-A. It can be fixed in a directly fixed manner or in a detachable connection manner. From the perspective of disassembly, repair and replacement, it is preferably fixed in a detachable manner. Specifically, holes can be opened on the connecting structure, and fasteners are used to fixedly connect the connecting structure and the piston rod.

[0039] When the first driving cylinder 31 is started, the piston rod drives the sliding rod 23 to slide, thereby changing the distance between the X-direction side frame 11 and the auxiliary stop 13. The sliding rod 23 drives the auxiliary stop 13 to move into the main frame under the drive, and the distance between the X-direction side frame 11 and the auxiliary stop 13 increases, which can make the embroidery material clamped by the auxiliary stop 13, the X-direction side frame 11 and the Y-direction side frame 12 in a relaxed state, facilitating the removal of the completed embroidery material and loading of new embroidery material; the sliding rod 23 drives the auxiliary stop 13 to move out of the main frame under the drive, and the distance between the X-direction side frame 11 and the auxiliary stop 13 decreases, making the clamped embroidery material tightened, which is mainly reflected in two aspects. On the one hand, the flatness will be improved, and the parts of the embroidery material far from the X-direction side frame 11, the Y-direction side frame 12, and the auxiliary stop 13, especially the central area of the embroidery material, will not collapse downward, and the clamped embroidery material can maintain a flat state. On the other hand, when the embroidery material is just tightened to a flat state, there are also differences in the tension of different positions of the embroidery material. The closer the embroidery material is to the four sides (the X-direction side frame 11, the Y-direction side frame 12, and the auxiliary stop 13), the lower the tension, showing an approximately linear inverse relationship. Therefore, the embroidery material not only needs to be flattened, but also the tension of different positions of the embroidery material needs to be approximately the same.

[0040] When an embroidery machine is embroidering, the embroidery material needs to be kept flat to ensure the accurate needle dropping position of the embroidery needle. If the embroidery material is not flat and shows a downward collapse as a whole, then there will be a horizontal deviation in the needle dropping position, resulting in deformation or even misshaping of the embroidered pattern. Moreover, the depth of each needle drop of the embroidery needle is set based on the flat embroidery material. The downward collapse will also cause the needle not to reach the proper position, affecting the embroidery quality. During embroidery, each position of the embroidery material also needs to maintain a relatively high tension. If the embroidery material is only flattened, the closer it is to the central area, the more insufficient the tension will be. When being pierced and pulled out by the embroidery needle, it will be subjected to a vertical force, causing the embroidery material to experience up and down fluctuations similar to elastic vibrations, damaging the embroidery quality. Therefore, each position of the embroidery material needs to have sufficient tension and maintain a tight state to have the performance of resisting vibrations during embroidery.

[0041] In practical applications, the overall tension degree of the embroidery material needs to be controlled more precisely. If the tension is too low, elastic vibrations are likely to occur during embroidery. If the tension is too high, the embroidery material is likely to be torn, or the needle holes on the embroidery material are likely to burst during embroidery, resulting in damage to the embroidery material. Therefore, a minimum threshold needs to be set for the distance between the auxiliary baffle 13 and the side frame, that is, the sliding rod 23 pulls the fixed seat 21 and the auxiliary baffle 13 to reduce the distance between the auxiliary baffle 13 and the side frame until the distance between the two is reduced to the minimum threshold. In this state, the tension of the embroidery material is appropriate.

[0042] A first limiting structure 32 is provided on the part of the sliding rod 23 between the fixed seat 21 and the sliding seat 22. The first limiting structure 32 only needs to present a structure protruding radially outward along the sliding rod 23 in terms of its structural form. When the distance between the auxiliary baffle 13 and the side frame is reduced to the minimum threshold, the first limiting structure 32 abuts against the sliding seat 22. In this embodiment, the first limiting structure 32 is set as a collar fixedly sleeved on the sliding rod 23. In addition, the connection relationship between the first limiting structure 32 and the sliding rod 23 is detachable, which can cope with embroidery materials of different sizes, textures and thicknesses.

[0043] It is worth noting that, from the time when the embroidery needle contacts the embroidery material to the time when it completely pierces the embroidery material, it will continue to press the embroidery material downward, causing it to partially sag downward. In this process, the embroidery material will be pulled in a horizontal direction toward the embroidery position, and this pulling action will damage the tension of the embroidery material. On the one hand, most embroidery machines in this field are high-speed or even ultra-high-speed embroidery modes, and the pulling action on the embroidery material is high-frequency. On the other hand, when a multi-head embroidery machine is used, the embroidery material will be embroidered at multiple locations at the same time, and the pulling action on the embroidery material as a whole is high-intensity. In summary, the high-frequency and high-intensity pulling action on the embroidery material during the embroidery process will greatly damage the tension of the embroidery material. Therefore, the Y-axis side frame 12, the X-axis side frame 11 and the auxiliary frame 13 need to have sufficient clamping strength for the fabric. For the auxiliary gear 13, while having sufficient clamping force for the embroidery material, it is also necessary to maintain the minimum threshold distance between the auxiliary gear 13 and the side frame. Therefore, the first driving cylinder 31 must always remain in the open state, and the force output by the driving cylinder 31 is used to balance the pulling effect on the embroidery material during the embroidery process. Even if the pulling effect is too large occasionally, causing the auxiliary gear 13 to move toward the inside of the main frame and increase the distance, the force output by the first driving cylinder 31 can quickly pull the auxiliary gear 13 toward the outside of the main frame, so that the distance between the auxiliary gear 13 and the side frame is maintained at the minimum threshold again.

[0044] The first driving cylinder 31 is always in a started state. In the process of balancing the pulling effect generated by embroidery and the driving effect of the first driving cylinder 31, the first limiting structure 32 may repeatedly collide with the sliding seat 22. Therefore, an elastic buffer layer 321 is attached to the end surface of the first limiting structure 32 facing the sliding seat 22. Specifically, an elastic rubber ring is sleeved on the sliding rod 23, and the elastic rubber ring is tightly attached to the end surface of the first limiting structure 32 facing the sliding seat 22, thereby replacing the first limiting structure 32 from conflicting with the sliding seat 22, thereby protecting the first limiting structure 32 and the sliding seat 22.

[0045] There is a preset maximum threshold value for the distance between the side frame and the auxiliary gear 13, and the slide bar 23 is provided with a second limiting structure. The first driving cylinder 31 drives the slide bar 23 to slide, so that when the distance between the auxiliary gear 13 and the side frame increases to the preset maximum threshold value, the second limiting structure conflicts with the sliding seat 22 to prevent the slide bar 23 from continuing to slide. In this embodiment, the connecting structure 23-A in which the two slide bars 23 pass through the fixed seat 21 and are fixedly sleeved can serve as the second limiting structure, and the second limiting structure can prevent the slide bar 23 from detaching from the sliding seat 22.

[0046] Both ends of the auxiliary gear 13 are provided with a limiting structure 131 extending outward on both sides. The limiting structure 131 is against the Y-direction side frame 12. When the main frame moves along the X and Y directions, there is vibration. The limiting structure can prevent the two ends of the auxiliary gear 13 from colliding with the Y-direction side frame 12.

[0047] In this embodiment, the secondary file 13 is arranged at an interval from one of the X-direction side frames 11. Two secondary files 13 can also be arranged within the bamboo frame, respectively at intervals from the two X-direction side frames 11, which is set according to the actual application requirements. In this embodiment, the secondary file 13 is arranged at an interval from the X-direction side frame 11 to tension the embroidery material in the width direction. It can also be arranged such that the secondary file 13 is at an interval from the Y-direction side frame 12, that is, to tension the embroidery material in the length direction. In terms of effect, arranging the secondary file 13 at an interval from the X-direction side frame 11 is better. The sliding seat 22 and the first driving cylinder 31 can also be arranged on the secondary file 13, and the fixed seat 21 is arranged on the X-direction side frame 11. However, this will increase the load on the secondary file 13, and the frequent movement of the secondary file 13 will also cause trouble for the wiring arrangement of the first driving cylinder 31. Therefore, the position settings of the fixed seat 21, the sliding seat 22, and the first driving cylinder 31 in this embodiment are the preferred solutions.

[0048] Embodiment 2:

[0049] Under the high-frequency and high-intensity pulling effect on the embroidery material during the embroidery process, the tensioning device needs to have a sufficiently strong force on the secondary file 13 to maintain the distance between the secondary file 13 and the side frame at the minimum threshold. That is, in Embodiment 1, the first driving cylinder 31 needs to have a relatively high output force. The preferred air cylinder in Embodiment 1 has an output force that is directly proportional to the inner diameter of the cylinder barrel. There are two ways to strengthen the force on the secondary file 13. The first way is to enhance the output force of the air cylinder (the first driving cylinder 31), that is, to use a large-sized air cylinder. Although the output force is increased, there are two disadvantages: First, it is relatively heavy, increasing the load on the side frame; second, it occupies a relatively large volume and is prone to interference with other devices, affecting the spatial layout of the embroidery machine. The second way is to increase the number of tensioning devices between the secondary file 13 and the side frame, and there are also two disadvantages: First, it increases the load on the side frame; second, it will increase the cost.

[0050] Based on the defects existing in Embodiment 1, the driving mechanism in this embodiment is different from that in Embodiment 1. Refer to Figure 4 , in this embodiment, the driving mechanism includes a first link structure 41 and a second link structure 42. The first link structure 41 is hinged to the second link structure 42. The first link structure 41 is directly or indirectly hinged to the X-direction side frame 11 to form a first hinge point, and the second link structure 42 is directly or indirectly hinged to the secondary file 13 or the slide bar 23 to form a second hinge point; by rotating the first link structure 41 and the second link structure 42, when the distance between the first hinge point and the second hinge point reaches the maximum or minimum value, the distance between the secondary file 13 and the X-direction side frame 11 is reduced to the preset minimum threshold.

[0051] The first link structure 41 and the second link structure 42 form a planar linkage mechanism. When the distance between the first hinge point and the second hinge point reaches the maximum or minimum value (depending on the positions of the first hinge point and the second hinge point), the hinge point of the first link structure 41 and the second link structure 42 is in the dead center position, causing the planar linkage mechanism to be jammed. During the embroidery process, the pulling force on the embroidered fabric cannot pull the auxiliary baffle 13 towards the inside of the main frame, so that the distance between the auxiliary baffle 13 and the X-direction side frame 11 is maintained at the minimum threshold.

[0052] In this embodiment, the first link structure 41 and the second link structure 42 can rotate within the vertical range or within the horizontal range.

[0053] Furthermore, the sliding seat 22 is arranged on the X-direction side frame 11, and the fixed seat 21 is arranged on the auxiliary baffle 13. The first link structure 41 includes two supports 411, two support plates 412, and a rotating shaft 413. The two supports 411 are fixedly arranged on the X-direction side frame 11 at intervals and are located on the side of the sliding seat 22 facing outside the main frame. The two support plates 412 are respectively hinged to the two supports 411 and can be turned up and down. The two ends of the rotating shaft 413 are rotatably connected to the two support plates 412 so that the rotating shaft 413 can rotate around its axis. The second link structure 42 is rod-shaped and is longer than the first link structure 41 in length. One end of it is indirectly hinged to the auxiliary baffle 13. Specifically, a pivot structure 21-A is arranged on the fixed seat 21, and one end of the second link structure 42 is hinged to the pivot structure 21-A, and the other end is connected to the rotating shaft 413. By rotating the first link structure 41 and the second link structure 42, when the first link structure 41 and the second link structure 42 are collinear and the distance between the first hinge point and the second hinge point reaches the minimum value, the distance between the auxiliary baffle 13 and the X-direction side frame 11 is reduced to the minimum threshold. In addition, the second link structure 42 penetrates through the rotating shaft 413, and two nuts 421 are threadedly sleeved to clamp and fix the rotating shaft 413, that is, different minimum thresholds can be adjusted according to embroidered fabrics of different sizes.

[0054] A straight groove 221 is opened at the top of the sliding seat 22. The width of the straight groove 221 is slightly larger than that of the second link structure 42, and can avoid interference and collision with the sliding seat 22 when the second link structure 42 rotates.

[0055] In this embodiment, the rotation of the first link structure 41 and the second link structure 42 is manually operated. For the convenience of operation, handles 414 are connected to the ends of the two support plates 412 far away from the hinged supports 411.

[0056] When the hinge point of the first link structure 41 and the second link structure 42 is in a dead state, although it can maintain its structural state under horizontal forces (the pulling force generated by embroidery), it will be damaged if subjected to vertical forces. And the embroidery machine vibrates during operation, which easily causes the stability of the stuck state of the first link structure 41 and the second link structure 42 to deteriorate. Therefore, in practical applications, the hinge point of the first link structure 41 and the second link structure 42 can be slightly rotated downward by a certain amount. Even if the hinge point of the first link structure 41 and the second link structure 42 swings slightly up and down under vibration, if it swings upward, it will return to the dead point position, and if it swings downward, it will be blocked by the X-direction side frame 11, thus forming a self-locking state and maintaining a stronger stability at the minimum threshold.

[0057] Embodiment Case 3:

[0058] Although the tensioning device in Embodiment Case 2 can completely resist the pulling force on the embroidery material during the embroidery process, it still has defects: First, the tensioning device in Embodiment Case 2 is manually operated, which reduces efficiency; Second, when operating, the handle of the tensioning device can only be rotated one by one from left to right or from right to left. During this process, the secondary gear 13 deviates from the X direction, and the slide rod 23 of the tensioning device deviates from the Y direction. Although there is a mechanical gap between the slide rod 23 and the sliding seat 22 and there will be no jamming situation, after long-term use, wear will occur between the slide rod 23 and the sliding seat 22 or the slide rod 23 will be skewed.

[0059] Based on the defects existing in Embodiment Case 2, the drive mechanism in this embodiment case is different from that in Embodiment Case 2. Referring to Figure 5 , in this embodiment case, the drive mechanism includes a first link structure 51, a second link structure 52, a swing structure 53, and a second drive cylinder 54. Similar to Embodiment Case 2, the first link structure 51 is hinged to the second link structure 52. The first link structure 51 is directly or indirectly hinged to the X-direction side frame 11 to form a first hinge point, and the second link structure 52 is directly or indirectly hinged to the secondary gear 13 or the slide rod 23 to form a second hinge point; when rotating the first link structure 51 and the second link structure 52 so that the distance between the first hinge point and the second hinge point reaches the maximum or minimum value, the distance between the secondary gear 13 and the X-direction side frame 11 is reduced to a preset minimum threshold.

[0060] In this embodiment, the fixed seat 21 is arranged on the secondary file 13, and the fixed seat 21 is arranged on the X-direction side frame 11. The first link structure 51 and the second link structure 52 rotate within a horizontal range, and both are in the shape of flat arms. The first link structure 51 and the second link structure 52 are hinged by a pin shaft 5-A passing through both of them. The first link structure 51 is indirectly hinged to the X-direction side frame 11. Specifically, a vertical pin shaft 5-B is arranged on the top surface of the fixed seat 21, and the first link structure 51 is slidably sleeved on the pin shaft 5-B. The second link structure 52 is indirectly connected to the slide rod 23. Specifically, a connecting structure 23-B is fixedly sleeved on the part of the two slide rods 23 passing through the sliding seat 22. The connecting structure 23-B is in the shape of a plate structure or a block structure extending along the X direction in terms of structure, and a vertical pin shaft 5-C is arranged and slidably sleeved by the second link structure 52. The connecting structure 23-B and the slide rod 23 are in a detachable connection relationship, and adjusting the connection position of the connecting structure 23-B on the slide rod 23 can adapt to different minimum thresholds.

[0061] The swing structure 53 is also arranged in a flat structure and is an integral structure with the first link structure 51. The swing structure 53 extends outward to one side of the sliding seat 22. An installation seat 542 is arranged on the surface of the secondary file 13 on one side of the sliding seat 22 and on the side where the swing structure 53 extends. A second driving cylinder 54 that can rotate within a horizontal range is hinged on the installation seat 542. The second driving cylinder 54 can use a hydraulic cylinder, a pneumatic cylinder, or an electric cylinder, but a pneumatic cylinder is preferably used. A pivot structure 543 is arranged on the piston rod 541 of the second driving cylinder 54 for hinging with one end of the extended swing structure 53.

[0062] By starting the second driving cylinder 54, the rotation of the first link structure 51 and the second link structure 52 can be driven. When the distance between the first hinge point and the second hinge point reaches the maximum value, the distance between the secondary file 13 and the X-direction side frame 11 is reduced to a preset minimum threshold. At this time, the hinge points of the first link structure 51 and the second link structure 52 are at the dead points, so that the first link structure 51 and the second link structure 52 are in a stuck state, and the distance between the secondary file 13 and the X-direction side frame 11 is maintained at the preset minimum threshold.

[0063] The force output by the second driving cylinder 54 is used to drive the rotation of the first link structure 51 and the second link structure 52, drive the slide rod 23 to slide so that the distance between the secondary file 13 and the X-direction side frame 11 is reduced to the minimum threshold, and then the second driving cylinder 54 stops driving and locks the cylinder. The piston rod 541 is in a locked state. No matter the force generated by the main frame moving along the X direction or the Y direction or the vibration generated during the operation of the embroidery machine can push the piston rod 541 to expand and contract, so that the hinge points of the first link structure 51 and the second link structure 52 are kept at the dead point positions, thereby maintaining the minimum threshold.

[0064] First, different from Embodiment 1, the second driving cylinder 54 has a lower requirement for the output acting force. Therefore, a model with a low power and a small cylinder diameter can be selected. After the distance between the auxiliary gear 13 and the X-direction side frame 11 is reduced to the minimum threshold, the second driving cylinder 54 stops driving and does not need to be always in an open state, which extends the service life and reduces the energy consumption. Moreover, after the second driving cylinder 54 stops driving, locking the piston rod 541 plays a self-locking function for the first link structure 51 and the second link structure 52 to maintain the distance between the auxiliary gear 13 and the X-direction side frame 11 at the minimum threshold. Secondly, compared with Embodiment 2, all the tensioning devices can be started simultaneously to avoid the loss caused by the wear between the sliding rod 23 and the sliding seat 22 due to the deviation of the auxiliary gear 13 from the X-direction and the deviation of the sliding rod 23 from the Y-direction.

[0065] The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement it. However, it should not be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. An embroidery frame for tensioning embroidery fabric, comprising a main frame formed by sequentially connecting four side frames end to end; characterized in that: One auxiliary stop spaced from one of the side frames or two auxiliary stops spaced from two opposite side frames are provided inside the main frame; A plurality of tensioning devices are connected between the spaced side frame and the auxiliary stop; The tensioning device includes a fixed seat, a sliding seat, at least one sliding rod, and a driving mechanism; the fixed seat and the sliding seat are respectively arranged on the auxiliary stop and the side frame, or the side frame and the auxiliary stop; one end of the sliding rod is fixedly connected to the fixed seat, and the other end can slide axially through the sliding seat; The driving mechanism can drive the sliding rod to slide, so that the distance between the auxiliary stop and the side frame is reduced to a preset minimum threshold and maintained; the driving mechanism includes a first link structure and a second link structure hinged to each other; the first link structure is directly or indirectly hinged to the side frame to form a first hinge point, and the second link structure is directly or indirectly hinged to the auxiliary stop or the sliding rod to form a second hinge point; when the first link structure and the second link structure are rotated so that the distance between the first hinge point and the second hinge point reaches the maximum or minimum value, the distance between the auxiliary stop and the side frame is reduced to the preset minimum threshold; The auxiliary stop is spaced from the longer side frame.

2. The embroidery frame for tensioning embroidery material according to claim 1, characterized in that, The first link structure and the second link structure rotate within a vertical range.

3. The embroidery frame for tensioning embroidery materials according to claim 2, characterized in that, The first link structure includes two supports, two support plates, and a rotating shaft; the two supports are fixedly spaced on the side frame, the two support plates are respectively hinged to the two supports, and both ends of the rotating shaft are rotatably connected to the two support plates so that the rotating shaft can rotate around its axis; the second link structure is connected to the rotating shaft.

4. The embroidery frame for tensioning the embroidery material according to claim 3, characterized in that, A handle is connected between the two support plates.

5. The embroidery frame for tensioning embroidery materials according to claim 3, characterized in that, The second link structure penetrates through the rotating shaft and is threadedly sleeved with two nuts to clamp and fix the rotating shaft.

6. The embroidery frame for tensioning embroidery materials according to claim 3, characterized in that, The sliding seat is arranged on the side frame, and the fixed seat is arranged on the auxiliary stop; the support is located on the side of the sliding seat facing away from the fixed seat, and a straight groove is opened at the top of the sliding seat to avoid the second link structure; the second link structure is hinged to the sliding seat.

7. The embroidery frame for tensioning embroidery materials according to claim 1, characterized in that, The first link structure and the second link structure rotate within a horizontal range.

8. The embroidery frame for tensioning embroidery materials according to claim 7, characterized in that, A swinging structure is integrally connected to the first link structure or the second link structure.

9. The embroidery frame for tensioning embroidery materials according to claim 8, characterized in that, The driving mechanism further includes a second driving cylinder, which is hinged to the side frame and can rotate within a horizontal range, and the piston rod of the second driving cylinder is hinged to the swinging structure.

10. The embroidery frame for tensioning embroidery materials according to claim 8, characterized in that, The sliding seat is arranged on the side frame, and the fixed seat is arranged on the auxiliary stop; the first link structure is hinged to the sliding seat; a detachable connecting seat is sleeved on the sliding rod, and the second link structure is hinged to the connecting seat.

11. The embroidery frame for tensioning embroidery fabric according to claim 10, characterized in that, The part of the sliding rod passing through the sliding seat is sleeved with the connecting seat.

12. The embroidery frame for tensioning embroidery materials according to claim 1, characterized in that, Limit structures extending outward to both sides are provided at both ends of the auxiliary stop, and the limit structures abut against the corresponding side frames.

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