Sewing equipment capable of synchronously sewing various materials

Abstract

The invention provides sewing equipment capable of synchronously sewing various materials, and relates to the technical field of sewing equipment. During sewing operation, fabric is attached to the surface of a cloth pressing block at the lowermost end in a cloth pressing column, and the cloth pressing column is driven to rotate in the cloth conveying process; a group of cloth pressing blocks arranged in a cloth pressing column slide independently, different fabrics are combined to form combinations with different thicknesses when sewing operation is carried out on various different fabrics, and when the fabrics with different thicknesses are attached to the surfaces of the cloth pressing blocks, the fabrics are squeezed to contract inwards, so that the fabrics with different thicknesses are sewn, and the fabric pressing blocks are pressed to be pressed to be pressed to be pressed to be pressed to be pressed to be pressed to be pressed to be pressed to be pressed to be pressed. The cloth pressing block obtains elastic force by compressing the first spring, and the elastic force dynamically adapts to a new pressing mode, so that the cloth pressing block always keeps proper collision force to press and press the cloth, namely, the cloth pressing block adapts to different thickness changes of stacking and synchronous sewing of various cloth materials; and proper downward pressure is always provided for superposition of cloth made of various materials through the characteristic of elastic deformation.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewing equipment, and more specifically, relates to a sewing equipment capable of synchronously sewing multiple materials. Background Art

[0002] A sewing machine that can simultaneously sew multiple materials is of great significance in textile and garment manufacturing and various fabric processing industries. Under today's diversified market demands, fields such as clothing, household goods, and industrial products often need to sew fabrics of different materials together to achieve unique designs, functions, or quality requirements. This equipment helps manufacturers handle various complex fabric combinations, meet diverse production needs, and provide strong support for product innovation. Whether it is a large-scale clothing company or a small workshop focusing on customized products, this equipment can improve production efficiency and product quality. The current device usually requires the following technologies in practical applications:

[0003] 1. Precise needle and presser foot coordinated control technology ensures that fabrics of different materials are stably pressed and the stitches are even during sewing;

[0004] 2. Efficient feeding drive technology ensures that the feed dog can push the fabric stably and accurately according to the characteristics of different materials;

[0005] 3. Flexible pressure adjustment technology can accurately adjust the presser foot pressure for fabrics of different thicknesses and textures;

[0006] 4. Stable structural design technology ensures that the equipment maintains stable operation during long-term and high-intensity suturing work.

[0007] At present, in order to achieve the function of simultaneous sewing of multiple materials, a variety of equipment and methods are used. Some traditional sewing machines try to sew different materials by simply adjusting the presser foot pressure and feed speed. Although some high-end sewing machines have more sophisticated pressure adjustment and feed control functions, when faced with the complex sewing of multiple materials, they still rely mainly on the operator's experience to make manual adjustments, such as adjusting the presser foot height with the knee. In terms of fabric tightening, most rely on fixed-structure presser feet, which are difficult to automatically adapt to the thickness changes of different material combinations. Operators need to frequently change presser feet or manually intervene, which is cumbersome and inefficient.

[0008] However, there is a prominent problem with the above method, that is, the existing equipment lacks an effective fabric thickness adaptive pressing structure when facing the simultaneous sewing of fabrics of multiple materials. The conventional presser foot does not have a built-in adaptive mechanism that can sense the change in fabric thickness. Therefore, it is difficult to make the change in downward pressure in the early stage of the change in fabric thickness. During the sewing process, the fabric may move or fluctuate due to the change in thickness, which will cause the position of the sewing needle to be unstable when piercing the fabric, and then make the stitches uneven and inconsistent in density, seriously affecting the appearance of the product. For example, when making high-end clothing, uneven stitches will reduce the overall quality of the clothing. Summary of the Invention

[0009] In order to solve the above technical problems, the present invention provides a sewing device that can sew multiple materials simultaneously to solve the above problems.

[0010] The cam is connected to the upper and lower ends of the L-shaped support frame, and the cam is connected to the lower end of the L-shaped support frame in a sliding manner. The cam is connected to the lower end of the L-shaped support frame in a sliding manner. The cam is connected to the lower end of the L-shaped support frame in a sliding manner. The cam is connected to the lower end of the L-shaped support frame in a sliding manner. The cam is connected to the lower end of the L-shaped support frame in a sliding manner. The cam is connected to the lower end of the L-shaped support frame in a sliding manner. The cam is connected to the lower end of the L-shaped support frame in a sliding manner. The extending round rod is provided inside the cloth pressing column, and an adjusting mechanism for driving a group of sliding adjustment blocks to synchronously extend and retract is provided. The adjusting mechanism includes an adjusting shaft, a turntable and a group of arc guide grooves. The adjusting shaft is provided inside the cloth pressing column, and the turntable is fixedly connected to the outer surface of the adjusting shaft. A group of the arc guide grooves are all opened inside the turntable, and a group of the extending round rods are respectively arranged inside a group of arc guide grooves. The outer surface of the adjusting shaft is fixedly connected to a limiting ring, and a socket mechanism for the rotation of the limiting adjusting shaft is provided inside the cloth pressing column, and the socket mechanism includes a limiting ring, a socket groove and a second spring, the limiting ring is slidably connected to the inside of the cloth pressing column, the socket groove is opened inside the limiting ring, the limiting ring is socketed inside the socket groove, and the second spring is fixedly connected to the outer surface of the limiting ring.

[0011] Preferably, the second spring is fixedly connected to the inner surface of the cloth pressing column, and a pressing groove is provided inside the limiting collar.

[0012] Preferably, the L-shaped additional support frame and the outer surface of the adjustment shaft are provided with a lifting mechanism for removing the loosened cloth, and the lifting mechanism includes a spur gear, a rack and a spline.

[0013] Preferably, the spur gear is sleeved on the outer surface of the adjusting shaft, the spur gear is rotatably connected to the inside of the cloth pressing column, and the rack is fixedly connected to the outer surface of the L-shaped mounting support frame.

[0014] Preferably, the spur gear and the rack are on the same horizontal line, the spline is fixedly connected to the outer surface of the adjusting shaft at one end close to the spur gear, a spline slot is provided inside the cloth pressing column, and the spline and the spline slot are on the same horizontal line.

[0015] Preferably, the outer surface of the adjusting shaft is fixedly connected with a non-slip striped handle bar, and the outer surfaces of the cloth pressing column and the non-slip striped handle bar are both fixedly connected with two sets of graduated directional marks.

[0016] Preferably, a clamping mechanism for sliding the limited height adjustment plate is provided inside the L-shaped additional support frame, and the clamping mechanism includes a sliding column, a triangular plug-in block, two third springs and a group of triangular slots, and the sliding column is slidably connected inside the L-shaped additional support frame.

[0017] Preferably, the triangular plug is fixedly connected to the outer surface of the sliding column, the two third springs are fixedly connected to the outer surface of the triangular plug, the two third springs are fixedly connected to the outer surface of the L-shaped additional support frame, a group of triangular slots are opened inside the height adjustment plate, and the triangular plug is clamped inside a group of triangular slots.

[0018] Preferably, a ball bearing is sleeved on the inner surface of the height adjustment plate, and the cloth pressing column is sleeved on the inner surface of the ball bearing.

[0019] Preferably, a group of feed dogs are provided inside the sewing machine head, the lower end of the sewing machine head is fixedly connected to a sewing workbench, and a pedal is provided inside the sewing workbench.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention provides a cloth pressing block. When the feed dog moves to feed the cloth, the material is conveyed to the lower end of the sewing needle for sewing. During the sewing operation, the cloth will be in contact with the surface of the cloth pressing block at the lower end of the cloth pressing column, and the cloth pressing column is driven to rotate during the cloth feeding process. A group of cloth pressing blocks arranged inside the cloth pressing column all slide independently. When sewing a variety of different fabrics, different fabric combinations form combinations of different thicknesses. When fabrics of different thicknesses are in contact with the surface of the cloth pressing block, they will be squeezed inwardly. The cloth pressing block obtains elastic force by compressing the first spring. This elastic force dynamically adapts to the new pressing method, so that it always maintains an appropriate resistance force to press the cloth down, that is, it adapts to the different thickness changes of the superimposed and synchronous sewing of a variety of cloth materials, and through its elastic deformation characteristics, it always provides appropriate downward pressure for the superposition of cloths of various materials, responds to the change of cloth thickness in the first time, thereby avoiding the position movement or fluctuation of the cloth.

[0022] In the present invention, a turntable is provided, and the adjusting shaft will drive the turntable installed on its surface to rotate. When the turntable rotates, the surface of the round rod is squeezed out through the circular arc guide groove opened inside. The circular arc guide groove has an arc shape and is opened at an angle. The rotation of the turntable synchronously pulls a group of sliding adjustment blocks to slide, thereby actively adjusting the extended position of the cloth pressing block. The cloth pressing block has a smaller initial elastic force when it fits the cloth, and the same smaller elastic force will provide a smaller downward pressure. Therefore, when facing fabrics with different downward pressure requirements, the production needs of more fabrics can be met by actively adjusting the extended length and downward pressure of the cloth pressing block, avoiding the phenomenon of insufficient downward pressure when facing thicker fabrics and pinching when facing thinner fabrics.

[0023] When the adjusting shaft is turned, the adjusting shaft drives the cloth pressing column to rotate as a whole. When the adjusting shaft is turned, the adjusting shaft will push the spur gear outward, and the spur gear will be pushed outward and meshed with the rack. At this time, the adjusting shaft is turned to rotate, and the adjusting shaft drives the cloth pressing column to slide upward and rise as a whole through the meshing of the spur gear and the rack, thereby quickly releasing the downward resistance to the cloth. In addition, this height adjustment method can quickly adjust the placement height of the cloth pressing column when facing fabrics with large thickness differences.

[0024] In the present invention, through the triangular plug-in block, when the height adjustment plate slides as a whole to adjust the placement height, the inclined surface of the triangular slot opened inside it will fit with the inclined surface of the triangular plug-in block, thereby pushing it toward the inside of the L-shaped additional support frame and compressing the third spring. The third spring and a group of triangular slots correspond to different placement heights of the height adjustment plate respectively. When adjusting to the next placement height, the triangular plug-in block is pushed by the third spring to be clamped in the triangular slot, thereby ensuring the stability of the height placement of the height adjustment plate.

[0025] In the present invention, through the limiting collar, when performing the operation of canceling the limit of the adjusting shaft, the staff pulls the limiting collar outward by fitting the surface of the pressing groove, and the sliding of the limiting collar causes the limiting ring and the sleeve groove to lose fit. At this time, the limiting collar will compress the second spring to contract. After the adjusting shaft is adjusted to complete the extension length of multiple fabric pressing blocks, the pulling on the limiting collar is released. At this time, the limiting collar is pushed inward by the second spring, so that the limiting collar is reset and sleeved on the surface of the limiting collar, so that the limit and free states of the adjusting shaft can be adjusted quickly and efficiently, so that the downward adjustment work can be carried out more efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the connection structure of the sewing machine head of the present invention;

[0028] Figure 3 This is an exploded view of the L-shaped mounting support frame connection of the present invention;

[0029] Figure 4 is an exploded view of the height adjustment plate connection of the present invention;

[0030] Figure 5 The present invention Figure 4 Enlarged view of point A in the middle;

[0031] Figure 6 This is an exploded view of the connection of the cloth pressing column of the present invention;

[0032] Figure 7 This is an exploded view of the connection of the cloth pressing block of the present invention;

[0033] Figure 8 This is an exploded view of the adjustment shaft connection of the present invention;

[0034] Figure 9 This is the second spring connection explosion diagram of the present invention

[0035] Figure 10 It is an exploded view of the spline connection of the present invention.

[0036] In the figure, the correspondence between the component names and the figure numbers is: 11, sewing machine head; 12, L-shaped additional support frame; 13, height adjustment plate; 14, fabric pressing column; 15, sliding adjustment block; 16, first spring; 17, fabric pressing block; 18, extending round rod; 19, adjusting shaft; 21, turntable; 22, arc guide groove; 23, limiting ring; 24, limiting collar; 25, sleeve groove; 26, second spring; 27, pressing groove; 28, spur gear; 29, rack; 31, plug-in spline; 32, spline slot; 33, anti-slip striped handle bar; 34, indexing direction mark; 35, sliding column; 36, triangular plug-in block; 37, third spring; 38, triangular slot; 39, ball bearing; 41, feed dog; 42, sewing workbench; 43, pedal. DETAILED DESCRIPTION

[0037] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0038] See also Figures 1-10The present invention provides a sewing device that can sew a variety of materials synchronously, including a sewing machine head 11, the lower end of the sewing machine head 11 is fixedly connected to an L-shaped additional support frame 12, the L-shaped additional support frame 12 is slidably connected to the interior of the height adjustment plate 13, the height adjustment plate 13 is rotatably connected to a cloth pressing column 14, the cloth pressing column 14 is provided with an elastic mechanism for pressing against cloths of different materials, the elastic mechanism includes a group of sliding adjustment blocks 15, a group of first springs 16 and a group of cloth pressing blocks 17, the group of sliding adjustment blocks 15 are all slidably connected to the interior of the cloth pressing column 14, the group of first springs 16 are respectively fixedly connected to the outer surface of the group of sliding adjustment blocks 15, and the group of cloth pressing blocks 17 are respectively fixedly connected to the outer surface of the group of first springs 16 away from the group of sliding At one end of the movable adjustment block 15, a group of cloth pressing blocks 17 are all slidably connected to the inside of the cloth pressing column 14, and the outer surfaces of a group of sliding adjustment blocks 15 are fixedly connected with a protruding round rod 18. The cloth pressing column 14 is provided with an adjustment mechanism for driving a group of sliding adjustment blocks 15 to synchronously extend and retract. The adjustment mechanism includes an adjusting shaft 19, a turntable 21 and a group of arc guide grooves 22. The adjusting shaft 19 is provided inside the cloth pressing column 14, the turntable 21 is fixedly connected to the outer surface of the adjusting shaft 19, a group of arc guide grooves 22 are all opened inside the turntable 21, a group of protruding round rods 18 are respectively provided inside a group of arc guide grooves 22, the outer surface of the adjusting shaft 19 is fixedly connected to the limiting ring 23, and the cloth pressing column 14 is provided with a sleeve for rotating the limited adjustment shaft 19 The connecting mechanism includes a limiting collar 24, a sleeve groove 25 and a second spring 26. The limiting collar 24 is slidably connected to the inside of the cloth pressing column 14. An L-shaped mounting support frame 12 is installed on the lower surface of the sewing machine head 11 near the position of the sewing needle by screwing a bolt. The L-shaped mounting support frame 12 provides support for the lifting and lowering adjustment of the height adjustment plate 13, and the height adjustment plate 13 provides support for the rotation of the cloth pressing column 14 through a ball bearing 39. When the feed dog 41 moves to feed the fabric, the material is conveyed to the lower end of the sewing needle for sewing. During the sewing operation, the fabric will fit with the surface of the fabric pressing block 17 at the lower end of the fabric pressing column 14, and drive the fabric pressing column 14 to rotate during the fabric conveying process. A group of cloth pressing blocks 17 arranged inside the pressing column 14 are all independently slidable. When sewing a variety of different fabrics, different fabric combinations form combinations of different thicknesses. When fabrics of different thicknesses are in contact with the surface of the cloth pressing block 17, they will be squeezed inward and contracted. The cloth pressing block 17 obtains elastic force by compressing the first spring 16. This elastic force dynamically adapts to the new downward pressure method, so that it always maintains appropriate resistance force to press the cloth down, that is, it adapts to the different thickness changes of multiple fabric materials superimposed and sewn synchronously, and through its elastic deformation characteristics, it always provides appropriate downward pressure for the superposition of multiple fabrics. The interior of the cloth pressing column 14 is sleeved and adjusted by a bearing to provide support for the rotation of the adjustment shaft 19.The surface of the adjusting shaft 19 can slide in the bearing by installing a set of splines. The extended round rod 18 installed on the surface of the sliding adjustment block 15 is larger than the thickness of the turntable 21, specifically twice its thickness. When the adjusting shaft 19 is in the initial position, the limiting collar 24 can be pulled outward to make the adjusting shaft 19 free. At this time, the surface of the anti-slip striped handle rod 33 is gripped and the adjusting shaft 19 is rotated. The anti-slip striped handle rod 33 provides an anti-slip effect for gripping. The adjusting shaft 19 will drive the turntable 21 installed on its surface to rotate. When the turntable 21 rotates, it squeezes the inner arc guide groove 22. The arc guide groove 22 extends outward from the surface of the round rod 18, and is angled. The rotation of the turntable 21 synchronously pulls a set of sliding adjustment blocks 15 to slide, thereby actively adjusting the extension position of the fabric pressing block 17. The initial elastic force of the fabric pressing block 17 is relatively small when it is in contact with the fabric, and this smaller elastic force will provide less downward pressure. Therefore, when facing fabrics with different downward pressure requirements, by actively adjusting the extension length and downward pressure of the fabric pressing block 17, the production needs of a wider range of fabric materials can be met, avoiding the phenomenon of insufficient downward pressure when facing thicker fabrics and pinching when facing thinner fabrics.

[0039] The sleeve groove 25 is provided inside the limiting collar 24, the limiting ring 23 is sleeved inside the sleeve groove 25, the second spring 26 is fixedly connected to the outer surface of the limiting collar 24, the second spring 26 is fixedly connected to the inner surface of the cloth pressing column 14, a pressing groove 27 is provided inside the limiting collar 24, and the outer surface of the L-shaped additional support frame 12 and the adjusting shaft 19 are provided with a lifting mechanism for removing and loosening the cloth. The lifting mechanism includes a spur gear 28, a rack 29 and a spline 31. The spur gear 28 is sleeved on the outer surface of the adjusting shaft 19, the spur gear 28 is rotatably connected to the inside of the cloth pressing column 14, the rack 29 is fixedly connected to the outer surface of the L-shaped additional support frame 12, the spur gear 28 and the rack 29 are on the same horizontal line, and the spline 31 is fixedly connected to the adjusting shaft 19. The outer surface of the joint shaft 19 is close to one end of the spur gear 28, and a spline slot 32 is provided inside the cloth pressing column 14. The plug-in spline 31 and the spline slot 32 are on the same horizontal line. The outer surface of the adjusting shaft 19 is fixedly connected with a non-slip striped handle rod 33, and the outer surfaces of the cloth pressing column 14 and the non-slip striped handle rod 33 are fixedly connected with two sets of graduated directional marks 34. A clamping mechanism for sliding the limited height adjustment plate 13 is provided inside the L-shaped additional support frame 12. The clamping mechanism includes a sliding column 35, a triangular plug block 36, two third springs 37 and a group of triangular slots 38. The sliding column 35 is slidably connected to the inside of the L-shaped additional support frame 12, the triangular plug block 36 is fixedly connected to the outer surface of the sliding column 35, and the two third springs 37 are fixedly connected The two third springs 37 are connected to the outer surface of the triangular plug-in block 36, and the two third springs 37 are fixedly connected to the outer surface of the L-shaped additional support frame 12. A group of triangular slots 38 are opened inside the height adjustment plate 13, and the triangular plug-in block 36 is clamped inside a group of triangular slots 38. After the fabric sewing process is completed, the staff needs to lift the fabric pressing column 14 to loosen its clamping of the fabric. At this time, the adjusting shaft 19 is pushed inward to slide (because the thickness of the protruding round rod 18 is twice that of the turntable 21, when the adjusting shaft 19 is pressed to slide, the turntable 21 also plays a role in limiting the protruding round rod 18). The sliding of the adjusting shaft 19 drives the plug-in spline 31 installed on its surface to slide and insert into the spline slot 32. At this time, the adjusting shaft 19 and the fabric pressing column 14 are combined into a When the adjusting shaft 19 is rotated, the adjusting shaft 19 will drive the fabric pressing column 14 to rotate as a whole. When the adjusting shaft 19 is pushed outward, the spur gear 28 will be pushed outward to extend (in the initial position, the spur gear 28 is arranged inside the fabric pressing column 14 and rotates inside the fabric pressing column 14 as the adjusting shaft 19 rotates). The spur gear 28 is pushed outward and meshes with the rack 29. At this time, the adjusting shaft 19 is rotated, and the adjusting shaft 19 drives the fabric pressing column 14 to slide upward as a whole through the meshing of the spur gear 28 and the rack 29, thereby quickly releasing the downward resistance to the fabric. In addition, this height adjustment method can quickly adjust the placement height of the fabric pressing column 14 when facing fabrics with large differences in thickness.When the height adjustment plate 13 is slid as a whole to adjust its placement height, the inclined surface of the triangular slot 38 provided therein mates with the inclined surface of the triangular insert 36, thereby pushing it toward the interior of the L-shaped mounting support frame 12 and compressing the third spring 37. The third spring 37 and a set of triangular slots 38 correspond to different placement heights of the height adjustment plate 13. When adjusting to the next placement height, the third spring 37 pushes the triangular insert 36 into the triangular slot 38, thereby ensuring the stability of the height adjustment plate 13.

[0040] The inner surface of the height adjustment plate 13 is sleeved with a ball bearing 39, and the cloth pressing column 14 is sleeved on the inner surface of the ball bearing 39. A group of feed teeth 41 are provided inside the sewing machine head 11, and the lower end of the sewing machine head 11 is fixedly connected to a sewing table 42. A pedal 43 is provided inside the sewing table 42. When sewing the fabric, the staff sits on one end of the sewing table 42 with the help of a bench, and the staff steps on the pedal 43 to drive the sewing needle and the presser foot to move back and forth. There is a suture thread inserted into the inside of the sewing needle, and the sewing thread is inserted into the sewing machine head. The position where the sewing needle and presser foot are installed inside 11 is equipped with a pressure-adjusting spring to adjust the pressure. When the pressure-adjusting spring is in a compressed state, it applies a downward force to the presser foot to press the fabric tightly. When facing thicker fabrics, such as denim, canvas, etc., the operator can rotate the pressure-adjusting knob to further compress the pressure-adjusting spring, increase the force of the spring on the presser foot, and then increase the pressure of the presser foot on the thick fabric, ensuring that the thick fabric is stable during the sewing process without sliding or shifting. On the contrary, for thin fabrics such as silk and chiffon, the spring can be appropriately released by adjusting the pressure-adjusting knob. The eccentric wheel is mounted on the driving shaft, and the eccentric wheel has an eccentric characteristic, which makes it move in a circular motion. When the eccentric wheel moves in a circular motion, a displacement change away from the axis will occur. One end of the connecting rod is connected to the eccentric wheel, and the other end is connected to the lifting and forward and backward moving mechanism of the feed dog 41. When the eccentric wheel rotates, the connecting rod is connected to the eccentric wheel. The rod is driven to perform reciprocating motion, thereby causing the feed dog 41 to produce a compound motion of up and down and front and back. The feed dog 41 will push the fabric forward during the reciprocating motion, and rhythmically deliver the fabric to the sewing area according to the set stitch length. When sewing in a straight line, the feed dog 41 pushes the fabric evenly to ensure that the stitches are even and neat. When sewing curves or complex patterns, the feed dog 41 works in conjunction with other parts of the sewing machine (such as the presser foot, needle bar, etc.) to accurately coordinate with the movement of the sewing needle, so that the fabric moves along the predetermined trajectory, ensuring the accuracy of the sewing pattern.

[0041] Working principle:

[0042] In the first step, when sewing the fabric, the worker sits on one end of the sewing workbench 42 with the help of a bench, and steps on the pedal 43 with his foot to drive the sewing needle and the presser foot to move back and forth. The sewing thread is threaded inside the sewing needle, and a pressure-adjusting spring is set at the position where the sewing needle and presser foot are installed inside the sewing machine head 11 to adjust the pressure. The pressure-adjusting spring is in a compressed state, exerting a downward force on the presser foot to press the fabric tightly. When facing thicker fabrics, such as denim, canvas, etc., the operator can further compress the pressure-adjusting spring by rotating the pressure-adjusting knob, thereby increasing the force of the spring on the presser foot, and then increasing the pressure of the presser foot on the thick fabric, ensuring that the thick fabric is stable during the sewing process without sliding or shifting. On the contrary, for fabrics as thin as silk and chiffon, the spring can be appropriately relaxed by adjusting the pressure-adjusting knob to reduce the pressure of the presser foot on the fabric, preventing the thin fabric from being wrinkled or damaged, thereby sewing multiple pieces of fabric. A set of feed dogs 41 is provided. When the staff steps on the pedal 43, the driving mode of the feed dogs 41 depends on the eccentric wheel and the connecting rod mechanism. The eccentric wheel is installed on the driving shaft. As the shaft rotates, the eccentric characteristics of the eccentric wheel cause it to move in a circular motion, which will produce a displacement change that deviates from the axis. One end of the connecting rod is connected to the eccentric wheel, and the other end is connected to the lifting and forward and backward movement mechanism of the feed dog 41. When the eccentric wheel rotates, the connecting rod is driven to perform reciprocating motion, thereby causing the feed dog 41 to produce a compound motion of up and down and back and forth. The feed dog 41 will push the fabric forward during the reciprocating motion and rhythmically deliver the fabric to the sewing area according to the set stitch length. When sewing in a straight line, the feed dog 41 pushes the fabric evenly to ensure that the stitches are even and neat. When sewing curves or complex patterns, the feed dog 41 works in conjunction with other components of the sewing machine (such as the presser foot, needle bar, etc.) to accurately coordinate with the movement of the sewing needle so that the fabric moves along the predetermined trajectory to ensure the accuracy of the stitching pattern.

[0043] In the second step, an L-shaped additional support frame 12 is installed on the lower surface of the sewing machine head 11 near the needle by screwing a bolt. The L-shaped additional support frame 12 provides support for the lifting and lowering adjustment of the height adjustment plate 13, and the height adjustment plate 13 provides support for the rotation of the cloth pressing column 14 through a ball bearing 39. When the feed dog 41 moves to feed the fabric, the material is transported to the lower end of the needle for sewing. During the sewing operation, the fabric will fit into the surface of the fabric pressing block 17 at the lower end of the fabric pressing column 14, and drive the fabric pressing column 14 to rotate during the fabric feeding process. A group of fabric pressing blocks 17 arranged inside the fabric pressing column 14 all slide independently, which is very useful for sewing a variety of different fabrics. During operation, different fabric combinations form combinations of different thicknesses. When fabrics of different thicknesses fit against the surface of the fabric pressing block 17, they will be squeezed inward and contracted. The fabric pressing block 17 obtains elastic force by compressing the first spring 16. This elastic force dynamically adapts to the new downward pressing method, so that it always maintains appropriate resistance to press the fabric downward, that is, it adapts to the different thickness changes of multiple fabric materials superimposed and stitched synchronously, and through its elastic deformation characteristics, it always provides appropriate downward pressure for the superposition of multiple fabric materials. The interior of the fabric pressing column 14 is sleeved with an adjustable shaft 19 in the form of a bearing to provide support for the rotation of the adjusting shaft 19, and the surface of the adjusting shaft 19 can slide in the bearing by installing a set of splines (as shown in the attached manual). Figure 8As shown in FIG, the size of the protruding round rod 18 mounted on the surface of the sliding adjustment block 15 is larger than the thickness of the turntable 21, specifically twice its thickness. When the adjustment shaft 19 is in the initial position, the limiting collar 24 can be pulled outward to make the adjustment shaft 19 in a free state. At this time, the surface of the anti-slip striped handle rod 33 is gripped and the adjustment shaft 19 is rotated. The anti-slip striped handle rod 33 provides an anti-slip effect for gripping. The adjustment shaft 19 will drive the turntable 21 mounted on its surface to rotate. When the turntable 21 rotates, the surface of the protruding round rod 18 is squeezed through the circular arc guide groove 22 opened inside. The circular arc guide groove 22 has an arc shape and is opened at an angle. The rotation of the turntable 21 synchronously pulls a group of sliding adjustment blocks 15 to slide, thereby actively adjusting the extended position of the cloth pressing block 17. The cloth pressing block 17 has a smaller initial elastic force when it fits the cloth, and the same smaller elastic force will provide a smaller downward pressure. Then, when facing fabrics with different downward pressure requirements, by actively adjusting the extended length and downward pressure of the cloth pressing block 17, the production needs of more fabrics can be met, avoiding the phenomenon of insufficient downward pressure when facing thicker fabrics and pinching when facing thinner fabrics. When canceling the limit operation of the adjustment shaft 19, the staff pulls outwards by fitting the surface of the pressing groove 27. The limiting collar 24 slides, and the limiting collar 24 slides so that the limiting ring 23 and the sleeve groove 25 lose contact. At this time, the limiting collar 24 will compress the second spring 26 to shrink. After the adjustment shaft 19 is turned to adjust the extension length of multiple cloth pressing blocks 17, the pull on the limiting collar 24 is released. At this time, the limiting collar 24 is pushed inward by the second spring 26, so that the limiting collar 24 is reset and sleeved on the surface of the limiting collar 23. A limiting block similar to teeth is installed on the surface of the limiting collar 23. A group of limit blocks are sleeved on the inner surface of the sleeve groove 25 through a group of blocks, and are fixed on the surfaces of the anti-slip striped handle rod 33 and the cloth lower pressure column 14 respectively. Install the dividing pointing marks 34. The number of the two groups of dividing pointing marks 34 corresponds to the number and direction of the blocks and spline slots 32 on the surface of the limit ring 23. By making the dividing pointing marks 34 on the surface of the anti-slip striped handle rod 33 correspond to the dividing pointing marks 34 on the surface of the fabric pressing column 14, it is ensured that the limit ring 23 and the limit collar 24 are connected and the spline 31 and the spline slot 32 are accurately fitted. When designing the device, by controlling the number of teeth of the spur gear 28, it is ensured that when the spline 31 is slidably inserted into the spline slot 32, the spur gear 28 and the rack 29 are in a meshing state.

[0044] The third step is that after the fabric sewing process is completed, the staff needs to lift the fabric pressing column 14 to loosen its clamping of the fabric, and at this time push the adjusting shaft 19 inward to slide (because the thickness of the protruding round rod 18 is twice that of the turntable 21, when the adjusting shaft 19 is pressed to slide, the turntable 21 also plays a limiting role on the protruding round rod 18), and the sliding of the adjusting shaft 19 drives the plug-in spline 31 mounted on its surface to slide and insert into the spline slot 32. At this time, the adjusting shaft 19 and the fabric pressing column 14 are combined into a whole. When the adjusting shaft 19 is screwed and rotated, the adjusting shaft 19 will drive the fabric pressing column 14 to rotate as a whole. When the adjusting shaft 19 is pushed outward, the spur gear 28 will be pushed outward to extend (in the initial position, the spur gear 28 is arranged inside the fabric pressing column 14 and rotates inside the fabric pressing column 14 as the adjusting shaft 19 rotates), and the spur gear 28 is pushed outward and meshes with the rack 29 When the fabric is in the state of being folded, the adjusting shaft 19 is rotated, and the adjusting shaft 19 drives the fabric pressing column 14 to slide upward as a whole through the meshing of the spur gear 28 and the rack 29, thereby quickly releasing the downward pressure on the fabric. In addition, this height adjustment method can quickly adjust the placement height of the fabric pressing column 14 when facing fabrics with large differences in thickness. When the height adjustment plate 13 slides as a whole to adjust the placement height, the inclined surface of the triangular slot 38 opened inside it will fit with the inclined surface of the triangular plug block 36, thereby pushing it into the L-shaped additional support frame 12 and compressing the third spring 37. The third spring 37 and a group of triangular slots 38 correspond to different placement heights of the height adjustment plate 13 respectively. When adjusting to the next placement height, the triangular plug block 36 is pushed by the third spring 37 to be clamped in the triangular slot 38, thereby ensuring the stability of the height placement of the height adjustment plate 13.

[0045] The embodiments of the present invention are presented for purposes of illustration and description and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are chosen and described in order to better illustrate the principles of the invention and its practical application and to enable those skilled in the art to understand the invention and design various embodiments with various modifications as suited for specific applications.

Claims

1. A sewing device capable of synchronously sewing a variety of materials, comprising a sewing machine head (11), wherein the lower end of the sewing machine head (11) is fixedly connected to an L-shaped mounting support frame (12), wherein a height adjustment plate (13) is slidably connected inside the L-shaped mounting support frame (12), wherein a cloth pressing column (14) is rotatably connected inside the height adjustment plate (13), wherein an elastic mechanism for pressing against cloths of different materials is provided inside the cloth pressing column (14), wherein the elastic mechanism is provided inside the cloth pressing column (14), wherein the elastic mechanism is provided for pressing against cloths of different materials, The elastic mechanism comprises a group of sliding adjustment blocks (15), a group of first springs (16) and a group of cloth pressing blocks (17); a group of the sliding adjustment blocks (15) are all slidably connected to the inside of the cloth pressing column (14); a group of the first springs (16) are respectively fixedly connected to the outer surface of a group of sliding adjustment blocks (15); a group of the cloth pressing blocks (17) are respectively fixedly connected to one end of the outer surface of a group of first springs (16) away from the group of sliding adjustment blocks (15); a group of the cloth pressing blocks (17) are all slidably connected to the inside of the cloth pressing column (14); a group of the outer surfaces of the sliding adjustment blocks (15) are all fixedly connected with a protruding round rod (18); an adjustment mechanism for driving the group of sliding adjustment blocks (15) to synchronously extend and retract is provided inside the cloth pressing column (14); the adjustment mechanism comprises an adjustment shaft (19), a turntable (21) and a group of circular arc guide grooves (22).

2. A sewing device capable of simultaneously sewing multiple materials as claimed in claim 1, characterized in that: The adjusting shaft (19) is arranged inside the cloth pressing column (14), the rotating disk (21) is fixedly connected to the outer surface of the adjusting shaft (19), a group of the arc guide grooves (22) are all opened inside the rotating disk (21), a group of the protruding round rods (18) are respectively arranged inside a group of the arc guide grooves (22), the outer surface of the adjusting shaft (19) is fixedly connected to the limiting ring (23), and a sleeve mechanism for the limited adjustment shaft (19) to rotate is provided inside the cloth pressing column (14), and the sleeve mechanism includes a limiting ring. A sleeve ring (24), a sleeve groove (25) and a second spring (26), wherein the limiting sleeve ring (24) is slidably connected to the inside of the cloth pressing column (14), the sleeve groove (25) is opened inside the limiting sleeve ring (24), the limiting circular ring (23) is sleeved inside the sleeve groove (25), the second spring (26) is fixedly connected to the outer surface of the limiting sleeve ring (24), the second spring (26) is fixedly connected to the inner surface of the cloth pressing column (14), and a pressing groove (27) is opened inside the limiting sleeve ring (24).

3. A sewing device capable of simultaneously sewing multiple materials as claimed in claim 2, characterized in that: The outer surfaces of the L-shaped mounting support frame (12) and the adjusting shaft (19) are provided with a lifting mechanism for removing and loosening the cloth, and the lifting mechanism comprises a spur gear (28), a rack (29) and a spline (31).

4. A sewing device capable of simultaneously sewing multiple materials as claimed in claim 3, characterized in that: The spur gear (28) is sleeved on the outer surface of the adjusting shaft (19), the spur gear (28) is rotatably connected to the inside of the cloth pressing column (14), and the rack (29) is fixedly connected to the outer surface of the L-shaped mounting support frame (12).

5. A sewing device capable of simultaneously sewing multiple materials as claimed in claim 4, characterized in that: The spur gear (28) and the rack (29) are on the same horizontal line, the plug-in spline (31) is fixedly connected to one end of the outer surface of the adjusting shaft (19) close to the spur gear (28), and a spline slot (32) is provided inside the cloth pressing column (14), and the plug-in spline (31) and the spline slot (32) are on the same horizontal line.

6. A sewing device capable of simultaneously sewing multiple materials as claimed in claim 5, characterized in that: The outer surface of the adjusting shaft (19) is fixedly connected to a non-slip striped handle bar (33), and the outer surfaces of the cloth pressing column (14) and the non-slip striped handle bar (33) are both fixedly connected to two sets of graduated directional markings (34).

7. A sewing device capable of simultaneously sewing multiple materials as claimed in claim 1, characterized in that: A clamping mechanism for sliding the limited height adjustment plate (13) is provided inside the L-shaped additional support frame (12), and the clamping mechanism comprises a sliding column (35), a triangular plug-in block (36), two third springs (37) and a group of triangular slots (38). The sliding column (35) is slidably connected inside the L-shaped additional support frame (12).

8. A sewing device capable of simultaneously sewing multiple materials as claimed in claim 7, characterized in that: The triangular plug (36) is fixedly connected to the outer surface of the sliding column (35), the two third springs (37) are fixedly connected to the outer surface of the triangular plug (36), the two third springs (37) are fixedly connected to the outer surface of the L-shaped mounting support frame (12), a group of triangular slots (38) are opened inside the height adjustment plate (13), and the triangular plug (36) is clamped inside the group of triangular slots (38).

9. A sewing device capable of simultaneously sewing multiple materials as claimed in claim 1, characterized in that: The inner surface of the height adjustment plate (13) is sleeved with a ball bearing (39), and the cloth pressing column (14) is sleeved on the inner surface of the ball bearing (39).

10. The sewing device capable of simultaneously sewing multiple materials as claimed in claim 1, characterized in that: A group of feed teeth (41) is provided inside the sewing machine head (11), a sewing workbench (42) is fixedly connected to the lower end of the sewing machine head (11), and a pedal (43) is provided inside the sewing workbench (42).

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