Double-needle splicing equipment and method capable of easily controlling processing quality

Abstract

The invention discloses double-needle splicing and sewing equipment capable of easily controlling processing quality and a method. The double-needle splicing and sewing equipment comprises a rack, a cloth strip supply device, a sewing device, a turning plate mechanism, a feeding mechanism and a control system, the plate turning mechanism comprises a left side plate and a right side plate which are driven by a first motor and a second motor to rotate respectively. The left side plate and the right side plate are each provided with a vacuum adsorption unit or a puncture positioning unit. A horizontal state positioning mechanism and a vertical state positioning mechanism are arranged below the left side plate and the right side plate; the horizontal state positioning mechanism comprises a lifting driving unit and a supporting piece; the vertical state positioning mechanism comprises an overturning driving unit and two groups of chucks; the feeding mechanism comprises a material supporting mechanism, and the material supporting mechanism is connected with a Y-axis driving mechanism and a Z-axis driving mechanism. The material supporting mechanism comprises two material supporting pieces arranged at intervals in the X-axis direction, a middle pressing core located between the two material supporting pieces, an X-axis opening and closing driving mechanism and a mounting base. Accurate material turning, supporting and feeding are achieved, and the double-needle abutted seam machining quality is improved.

Description

Technical Field

[0001] This invention relates to sewing technology, and in particular to a double-needle sewing equipment and method that is easy to control in terms of processing quality, which is mainly but not limited to the double-needle sewing processing of cap pieces. Background Technology

[0002] Reference Figure 14 and Figure 15 As shown, taking a baseball cap as an example, its crown is formed by sewing together several adjacent cap pieces A1 to create a hemispherical crown. In actual sewing, two adjacent cap pieces A1 are overlapped and sewn on one side. Then, the two cap pieces A1 are turned outwards from the center seam A2 as a reference. The presser foot needs to be placed on top of the two cap pieces A1 after they are turned out, and double needle sewing is performed on both sides of the center seam A2. During sewing, a side strip A3 is placed on the inside of the cap piece A1. The side strip covers the center seam A2 of the two cap pieces A1. The two sides of the side strip A3 form a sewing track A4 with the corresponding positions of the two cap pieces A1's center seam A2.

[0003] Currently, the common practice is to manually unfold the two cap flaps (sewn on one side) and place them under the sewing machine head, where they are held down by the presser foot before double-needle sewing. This method is inefficient and makes it difficult to guarantee consistent sewing precision. Some industry researchers have explored tooling for automatically unfolding cap flaps. In use, this tooling fixture is driven by a multi-axis motion servo mechanism, forming a template. The fixture clamps the fabric flaps and moves them along a specified contour curve to complete the sewing. However, its structure is complex, and its application to existing mature double-needle sewing machines requires significant modifications, making it difficult to directly apply to existing double-needle sewing machines. Furthermore, current automatic cap flap unfolding systems use cylinders with linear drive and fixed strokes, relying on connecting parts for rotation control. This inevitably leads to inconsistent opening and closing smoothness, and the need for manual electric cylinder control further complicates operation and limits efficiency improvements.

[0004] Therefore, a new technical solution needs to be researched to address the above problems. Summary of the Invention

[0005] In view of this, the present invention addresses the deficiencies of the existing technology, and its main objective is to provide a double-needle stitching device and method that is easy to control in terms of processing quality, which achieves precise material turning, supporting, and feeding, thereby improving the processing quality of double-needle stitching.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A double-needle sewing machine with easily controllable processing quality includes a frame and a fabric strip supply device and a sewing device mounted on the frame. The frame is also equipped with a flipping mechanism, a feeding mechanism and a control system, which are respectively connected to the flipping mechanism, the feeding mechanism, the fabric strip supply device and the sewing device. The flipping mechanism includes a left side plate and a right side plate, which can flip up and down around an axis. It also includes a first motor for driving the left side plate to flip up and down and a second motor for driving the right side plate to flip up and down. Both the left side plate and the right side plate are provided with vacuum adsorption units for adsorbing the sheet material; or, both the left side plate and the right side plate are provided with puncture positioning units for piercing the sheet material. A horizontal positioning mechanism and a vertical positioning mechanism are provided below the left and right side plates; the horizontal positioning mechanism includes a lifting drive unit and a support component, and the lifting drive unit drives the support component to move up and down; the vertical positioning mechanism includes a flipping drive unit and two sets of clamps, and the flipping drive unit drives the two sets of clamps to flip up and down. The feeding mechanism includes a material support mechanism, which is connected to a Y-axis drive mechanism and a Z-axis drive mechanism. The material support mechanism includes two material support components spaced apart along the X-axis, an intermediate pressure core located between the two material support components, an X-axis tensioning and closing drive mechanism, and a mounting base. The two material support components are connected to the X-axis tensioning and closing drive mechanism. The X-axis tensioning and closing drive mechanism drives the two material support components to move away from the material pieces on both sides of the middle seam along the X-axis or to move towards each other and reset synchronously. The X-axis tensioning and closing drive mechanism and the intermediate pressure core are respectively mounted on the mounting base.

[0007] As a preferred embodiment, the first motor is connected to a first drive wheel, a first transmission wheel, and a first synchronous belt; the first drive wheel is connected to the first motor, the first transmission wheel is rotatably sleeved on the shaft and connected to the left side plate, and the first synchronous belt is connected between the first drive wheel and the first transmission wheel; The second motor is connected to a second drive wheel, a second transmission wheel, and a second synchronous belt; the second drive wheel is connected to the second motor, the second transmission wheel is rotatably sleeved on the shaft and connected to the right side plate, and the second synchronous belt is connected between the second drive wheel and the second transmission wheel.

[0008] As a preferred embodiment, the shaft is connected to the sewing machine head end to a folding mechanism that folds up the sewing edge between two pieces of material; the folding mechanism includes a clamping cylinder and a pushing cylinder. The clamping cylinder is connected to a pair of clamps that open and close along the X-axis, which are used to clamp the sewing edge between the two pieces of material. The pushing cylinder is connected to the clamping cylinder to drive the clamping cylinder to swing and move.

[0009] As a preferred embodiment, the clamping cylinder is mounted on a cylinder seat, which is provided with a connecting shaft and a connecting crank. The telescopic rod of the flat-push cylinder is connected to the connecting shaft through a fisheye connector. The fisheye connector is rotatable relative to the connecting shaft. The upper end of the connecting crank is provided with a shaft hole, and it is rotatably sleeved on the shaft body facing the sewing machine head end through the shaft hole.

[0010] As a preferred embodiment, a workpiece sensing unit is provided below the right side plate, and correspondingly, a sensing hole is provided on the right side plate. When the workpiece sensing unit senses that the workpiece has been placed on the right side plate, the control system controls the right side plate to automatically flip upward.

[0011] As a preferred embodiment, the left side plate is connected to a first ring portion, and one end of the first transmission wheel extends axially to a first extension portion. The first ring portion is fitted onto the first extension portion and fixedly connected. The left side plate is also connected to a second ring portion, and a first bearing is fitted onto the shaft body. The second ring portion is fitted onto the first bearing.

[0012] As a preferred embodiment, the right side plate is connected to a third ring, and one end of the second drive wheel extends axially to a second extension. The third ring is fitted onto the second extension and fixedly connected. The right and left side plates are also connected to a fourth ring, and a second bearing is fitted onto the shaft. The fourth ring is fitted onto the second bearing.

[0013] As a preferred embodiment, a feeding guide panel is provided between the flipping mechanism and the sewing device. The feeding guide panel has a guide groove extending along the Y-axis, which is positioned directly opposite the middle gap between the left and right side plates.

[0014] As a preferred embodiment, a retaining groove is provided through the bottom of the guide groove to keep the folded edge in position.

[0015] A double-needle stitching method with easily controllable processing quality, which utilizes the double-needle stitching equipment with easily controllable processing quality described in any of the preceding claims, includes the following steps: Step 1: When the material is being laid out, the left side panel is set vertically upwards and the right side panel is set horizontally. Place the two single-sided sewn pieces flat on the right side panel, with the middle sewn edge of the two pieces against the left side panel as the placement and positioning reference. Step 2: The control system controls the second motor to drive the right side plate to rotate upward 90 degrees and stack vertically on the right side of the left side plate, with the two pieces sandwiched between the left and right side plates. Step 3: The flip drive unit drives the two sets of chucks to flip upwards and move closer together to further clamp the left and right side plates; Step 4: The vacuum adsorption unit or the puncture positioning unit starts working, and the two pieces are stably adsorbed onto the left side plate and the right side plate respectively. Step 5: The left and right side plates are flipped downwards away from each other at an angle of 20-60 degrees, and both extend inclinedly to the top of the shaft to form a V-shape; at this time, the two pieces are attached to the left and right side plates respectively, and open into a V-shape as the left and right side plates are flipped downwards. Step 6: The material support mechanism moves downward under the drive of the Z-axis drive mechanism, and the middle pressure core presses on the middle seam of the two material pieces; the left and right side plates continue to flip downward away from each other until they are both in a horizontal state. During the process of approaching the horizontal state, the lifting drive unit drives the support members to rise to support the bottom of the left and right side plates respectively; the two material support members act on the two material pieces and, under the drive of the X-axis opening and closing drive mechanism, synchronously open the two material pieces away from each other along the X-axis, so that a cap-piece flat area is formed between the two material support members and the middle pressure core; Step 7: Under the drive of the Y-axis drive mechanism, the material support mechanism moves along the Y-axis to below the sewing machine head of the sewing device, and sends the stretched material sheet to below the sewing machine head. The presser foot and / or positioning component below the sewing machine head positions the stretched material sheet. Under the drive of the Y-axis drive mechanism, the material support mechanism moves along the Y-axis to reset. The sewing device performs double-needle sewing, and the fabric strip supply device simultaneously provides fabric strips to sew the fabric strips onto the material sheet, forming two sewing tracks located on the left and right sides of the middle seam respectively.

[0016] Compared with existing technologies, this invention has significant advantages and beneficial effects. Specifically, as can be seen from the above technical solution, it mainly achieves precise material turning, supporting, and feeding through the setting of a flipping mechanism and a feeding mechanism, thereby improving the processing quality of double-needle stitching. Among them, two motors control the left and right side plates respectively, and the flipping mechanism is equipped with a horizontal state positioning mechanism and a vertical state positioning mechanism for the two key states of the flipping mechanism, which improves the accuracy of material feeding and supporting. Before double-needle stitching, the cap piece and other workpieces are pressed down, positioned, opened, and fed in a Y-axis direction. It is easy to combine with mature double-needle stitching equipment that is easy to control the processing quality for implementation. In particular, the setting of the middle pressure core can press and position the middle stitching of the workpiece to avoid displacement. At the same time, it is conducive to the two supporting components to smoothly and accurately open the two pieces, which is beneficial to improving the processing quality of double-needle stitching.

[0017] To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0018] Figure 1 This is a perspective view of a double-needle stitching device for easy quality control, according to an embodiment of the present invention. Figure 2 This is a perspective view of the flip-plate mechanism of a double-needle stitching device that is easy to control in terms of processing quality, according to an embodiment of the present invention; Figure 3 This is an exploded view of the flip-plate mechanism of a double-needle stitching device that is easy to control in terms of processing quality, according to an embodiment of the present invention; Figure 4Another exploded view of the flip-plate mechanism of the double-needle stitching device, which is an embodiment of the present invention, and which facilitates the control of processing quality. Figure 5 This is a cross-sectional view of the flip-plate mechanism of a double-needle stitching device that is easy to control in terms of processing quality, according to an embodiment of the present invention; Figure 6 This is a perspective view of the folding mechanism of a double-needle stitching device with easily controllable processing quality, according to an embodiment of the present invention; Figure 7 Another perspective view of the folding mechanism of the double-needle stitching equipment, which is easy to control in terms of processing quality, according to an embodiment of the present invention. Figure 8 This is another cross-sectional view of the flip-plate mechanism of the double-needle stitching device, which is easy to control the processing quality according to an embodiment of the present invention; Figure 9 This is a perspective view of the horizontal positioning mechanism of a double-needle stitching device that is easy to control in terms of processing quality, according to an embodiment of the present invention. Figure 10 This is a perspective view of the vertical positioning mechanism of a double-needle stitching device that is easy to control in terms of processing quality, according to an embodiment of the present invention. Figure 11 This is an exploded view of the feeding mechanism of a double-needle stitching device that is easy to control in terms of processing quality, according to an embodiment of the present invention; Figure 12 This is a perspective view of the material support mechanism of a double-needle stitching device that is easy to control in terms of processing quality, according to an embodiment of the present invention; Figure 13 This is another perspective view of the material support mechanism of the double-needle stitching device, which is easy to control in terms of processing quality, according to an embodiment of the present invention; Figure 14 This is a structural diagram of a baseball cap; Figure 15 This is another structural illustration of a baseball cap. Detailed Implementation

[0019] Please refer to Figures 1 to 13 As shown, it illustrates the specific structure of an embodiment of the present invention.

[0020] In the description of this invention, it should be noted that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0021] Please refer to Figure 1As shown, a double-needle sewing machine with easily controllable processing quality includes a frame and a flipping mechanism, a feeding mechanism, a fabric strip supply device, and a sewing device mounted on the frame. It also includes a control system (which includes an industrial control screen). The control system is connected to the flipping mechanism, the feeding mechanism, the fabric strip supply device, and the sewing device. During operation, a cap piece is placed on the flipping mechanism, which pre-opens the cap piece. Then, the feeding mechanism presses it down to the middle seam of the cap piece and further opens and positions it to the left and right, before feeding it to the sewing device. The fabric strip supply device provides a fabric strip to the sewing device, with the strip located below the middle seam of the cap piece. Double-needle sewing is performed at the sewing device, sewing the fabric strip onto the cap piece, forming two sewing tracks located on the left and right sides of the middle seam.

[0022] Specifically: Please refer to Figures 2 to 10 As shown, the flip-plate mechanism, It includes a left side plate 401 and a right side plate 402, which can be flipped up and down around an axis 403. It also includes a first motor 41 for driving the left side plate 401 to flip up and down and a second motor 42 for driving the right side plate 402 to flip up and down. The axis 403 is mounted on a flip plate base 40, and a first support 4001 and a second support 4002 are provided on the flip plate base 40 to support the two ends of the axis 403.

[0023] Both the left side plate 401 and the right side plate 402 are provided with vacuum adsorption units 411 for adsorbing the sheet; or, both the left side plate 401 and the right side plate 402 are provided with puncture positioning units for piercing the sheet.

[0024] The first motor 41 is connected to a first drive wheel 411, a first transmission wheel 412 and a first synchronous belt 413; the first drive wheel 411 is connected to the first motor 41, the first transmission wheel 412 is rotatably sleeved on the shaft 403 and connected to the left side plate 401, and the first synchronous belt 413 is connected between the first drive wheel 411 and the first transmission wheel 412. The second motor 42 is connected to a second drive wheel 421, a second transmission wheel 422 and a second synchronous belt 423; the second drive wheel 421 is connected to the second motor 42, the second transmission wheel 422 is rotatably sleeved on the shaft 403 and connected to the right side plate 402, and the second synchronous belt 423 is connected between the second drive wheel 421 and the second transmission wheel 422.

[0025] In the material feeding state, the left side plate 401 is vertically positioned upwards, and the right side plate 402 is horizontally positioned. Two single-sided sewn material pieces (such as cap pieces) are placed flat on the right side plate 402, and the vertically positioned left side plate 401 can be used as a placement and positioning reference. Typically, a workpiece sensing unit is provided below the right side plate 402, and correspondingly, a sensing hole is provided on the right side plate 402. When the workpiece sensing unit senses that the workpiece is placed on the right side plate 402 in place (the material piece covers the sensing hole), the second motor 42 drives the right side plate 402 to flip upwards.

[0026] When the material is clamped, the right side plate 402 flips upward to switch from a horizontal state to a vertical stack on the right side of the left side plate 401. At this time, the cap is clamped between the left side plate 401 and the right side plate 402. In the pre-supported state, the left side plate 401 and the right side plate 402 are flipped downwards away from each other at an angle of 20-60 degrees, and both extend obliquely above the shaft 403 to form a V-shape; at this time, the two caps are respectively attached to the left side plate 401 and the right side plate 402, and open into a V-shape as the left side plate 401 and the right side plate 402 are flipped downwards; In the supporting state, the left side plate 401 and the right side plate 402 continue to flip downwards away from each other until both are in a horizontal state. In this stage, a supporting mechanism is usually configured to press down on the material sheet and spread the two material sheets to the left and right. In the supporting state, the vacuum adsorption unit 411 releases the adsorption effect on the material sheet (or the piercing positioning unit releases the piercing positioning of the material sheet). Therefore, during the process of the left side plate 401 and the right side plate 402 continuing to flip downwards away from each other to a horizontal state, the material sheet will not flip with the left side plate 401 and the right side plate 402. Subsequently, it is once again in the waiting state, i.e. the feeding state, and the left side plate 401 flips upward to switch from the horizontal state to the vertical state.

[0027] In this embodiment, the left side plate 401 is connected to a first ring portion 4011, and one end of the first transmission wheel 412 extends axially with a first extended portion. The first ring portion 4011 is sleeved on the first extended portion and fixedly connected. The first extended portion can be designed as a cylinder with an irregular cross-section on its circumference. The irregular cross-section refers to, for example, having two or more inclined surfaces on the circumference, preferably arranged at uniform intervals along the circumference. An internal threaded hole is provided on the first ring portion 4011, and a screw is inserted into the internal threaded hole with its inner end abutting against the inclined surface, thereby achieving mutual fixation between the first ring portion 4011 and the first extended portion. The left side plate 401 is also connected to a second ring portion 4012, and a first bearing is sleeved on the shaft 403. The second ring portion 4012 is sleeved on the first bearing.

[0028] In this embodiment, the right side plate 402 is connected to a third ring portion 4021, and one end of the second transmission wheel 422 extends axially with a second extended portion. The third ring portion 4021 is sleeved on the second extended portion and fixedly connected. Similarly, the second extended portion can be designed as a cylinder with an irregular cross-section on its circumference. The irregular cross-section refers to, for example, having two or more inclined surfaces on the circumference, preferably arranged at uniform intervals along the circumference. An internal threaded hole is provided on the third ring portion 4021, and a screw is inserted into the internal threaded hole with its inner end abutting against the inclined surface, thereby achieving mutual fixation between the third ring portion 4021 and the second extended portion. The right side plate 402 is also connected to a fourth ring portion 4022, and a second bearing is sleeved on the shaft 403. The fourth ring portion 4022 is sleeved on the second bearing.

[0029] The shaft 403, facing the sewing machine head 50, is connected to a folding mechanism that tilts / arcically folds the middle sewing edge of two pieces of fabric upwards. The folding mechanism includes a clamping cylinder 43 and a folding cylinder 44. The clamping cylinder 43 is connected to a pair of clamps 431 that open and close along the X-axis, used to clamp the middle sewing edge of the two pieces of fabric. One clamp has an X-axis guide plate extending horizontally towards the bottom of the other clamp, with the bottom of the other clamp located above the X-axis guide plate. During the opening and closing action, the bottom of the other clamp moves relative to the X-axis guide plate. The folding cylinder 44 is connected to the clamping cylinder 43 to drive the clamping cylinder 43 to swing upwards. The clamping cylinder 43 is mounted on a cylinder seat 4301. The cylinder seat 4301 is provided with a connecting shaft 4302 and a connecting crank 4303. The telescopic rod of the push-folding cylinder 44 is connected to the connecting shaft 4302 via a fisheye connector, which is rotatable relative to the connecting shaft 4302. The upper end of the connecting crank 4303 has a shaft hole, and it is rotatably fitted onto the end of the shaft 403 facing the sewing machine head 50 through the shaft hole. The end of the shaft 403 facing the sewing machine head 50 extends beyond the outer end of the second upright 4002. In use, when the clamp grips the middle sewing edge of two pieces of material, the push-folding cylinder 44 drives the clamping cylinder 45 to swing upwards, causing the middle sewing edge of the two pieces of material to be folded upwards from a vertically downward position.

[0030] Therefore, the flipping mechanism is controlled by two motors, one for the left side plate and one for the right side plate. The motors are easy to control precisely and can control different strokes multiple times, improving the accuracy of feeding and supporting the material, which is beneficial to improving the quality of double-needle stitching. Secondly, the use of the workpiece sensing unit enables automatic motor control, eliminating the need for manual operation of the start switch, simplifying operation, improving work efficiency, and reducing the risk of human error. Furthermore, its structure is compact and reasonable, integrating a folding mechanism on the shaft facing the sewing machine head. This mechanism can clamp and position the lower end of the fabric when it is clamped, which is beneficial to the overall centering and positioning of the fabric. At the same time, the folding mechanism can fold the middle sewing edge of the two pieces of material, which is beneficial to the subsequent double-needle stitching processing quality and better flatness.

[0031] Furthermore, for the flip-up mechanism, a horizontal positioning mechanism and a vertical positioning mechanism are provided below the left side plate 401 and the right side plate 402.

[0032] The horizontal positioning mechanism includes a lifting drive unit 45 and a support member 46. The lifting drive unit 45 drives the support member 46 to move up and down. In this embodiment, the lifting drive unit 45 is a lifting cylinder. The telescopic end of the lifting cylinder is connected to a lifting plate 451. At least two support members 46 are provided, with their lower ends on the lifting plate 451. At least one support member 46 is used to support the left side plate 401, and at least another support member 46 is used to support the right side plate 402.

[0033] The vertical positioning mechanism includes a flipping drive unit 47 and two sets of clamps 48. The flipping drive unit 47 drives the two sets of clamps 48 to flip up and down. In this embodiment, the flipping drive unit 47 is a flipping clamping cylinder, which is also commonly referred to as a rotary clamping cylinder. The two sets of clamps 48 are respectively connected to the two rotating ends of the flipping clamping cylinder. The clamps 48 extend horizontally, with a clamping protrusion 481 extending upward from the top of their outer ends. The inner ends of the clamps 48 are respectively connected to the flipping cylinder. When the rotating clamping cylinder drives the two rotating ends to rotate 90 degrees upwards and closer together, the chuck 48 is in a vertical position, and the clamping protrusion 481 is horizontally inwards against the left side plate 401 and the right side plate 402 (referring to the left side surface of the left side plate 401 and the right side surface of the right side plate 402). When the rotating clamping cylinder drives the two rotating ends to rotate 90 degrees downwards and away from each other, the chuck 48 is in a horizontal position, and the clamping protrusion 481 is vertically upwards. The rotating drive unit 47 is located directly below the shaft 403, with the two rotating ends symmetrically located on the left and right sides of the downward projection area of ​​the shaft 403.

[0034] In the first state (also known as the clamping state), the left side plate 401 and the right side plate 402 are flipped upward and brought together in a vertical state. The flipping drive unit 47 drives the two sets of clamps 48 to flip upward and bring together to further clamp the left side plate 401 and the right side plate 402, so that the left side plate 401 and the right side plate 402 are more closely attached to the material. In the second state (also known as the material-supporting state), the left side plate 401 and the right side plate 402 are flipped downwards and moved away to a horizontal position. The lifting drive unit 45 drives the support member 46 to rise and support the bottom of the left side plate 401 and the right side plate 402 respectively, ensuring that they are in a horizontal and stable state and preventing them from tilting and collapsing downwards during material placement. Preferably, a workpiece sensing unit is provided below the right side plate 402, and correspondingly, a sensing hole is provided on the right side plate 402. When the workpiece sensing unit senses that the workpiece has been placed on the right side plate 402, the right side plate automatically flips upwards.

[0035] Preferably, after the flipping drive unit 47 drives the two sets of clamps 48 to clamp the left side plate 401 and the right side plate 402, the vacuum adsorption unit 411 or the puncture positioning unit starts working. The clamps 48 are set to correspond to the vacuum adsorption unit 411 or the puncture positioning unit for better clamping effect.

[0036] Therefore, by using a horizontal positioning mechanism, it is ensured that the material is in a stable horizontal state, preventing it from tilting and collapsing downwards during feeding. At the same time, it provides a precise horizontal position, which is conducive to the controllability of flipping to other positions. By using a vertical positioning mechanism, the left side plate 401 and the right side plate 402 are made to adhere more tightly to the material sheet. In this way, after further clamping, the vacuum adsorption unit is controlled to hold the sheet (or the piercing positioning unit is controlled to pierce the sheet), which improves the positioning firmness of the left side plate and the right side plate to the attached material sheet, so that the material sheet can be accurately flipped open according to the left side plate and the right side plate.

[0037] Please refer to Figures 11 to 13 As shown, the feeding mechanism, The system includes a material support mechanism 20 and a YZ-axis drive mechanism 10 for driving the material support mechanism 20 to move along the Y-axis and Z-axis. An industrial control screen 30 is mounted on the YZ-axis drive mechanism 10. However, the industrial control screen 30 is not limited to this mounting position; it only needs to be placed in a relatively stationary position on the frame. The YZ-axis drive mechanism 10 includes a base 11 and a Y-axis drive mechanism 12 and a Z-axis drive mechanism 13 mounted on the base. The material support mechanism 20 is connected to the Y-axis drive mechanism 12 and the Z-axis drive mechanism 13. The Y-axis drive mechanism 12 connects to and drives the Z-axis drive mechanism 13 to move horizontally along the Y-axis, and the Z-axis drive mechanism 13 connects to and drives the material support mechanism 20 to move vertically along the Z-axis.

[0038] The material support mechanism 20 includes two material support members 21 spaced apart along the X-axis, an intermediate pressure core 22 located between the two material support members 21, an X-axis tensioning and closing drive mechanism, and a mounting base 24. The two material support members 21 are used to respectively open the material sheets on both sides of the intermediate seam. The intermediate pressure core 22 is used to press against the intermediate seam. The two material support members 21 are connected to the X-axis tensioning and closing drive mechanism, which drives the two material support members 21 to synchronously move away from the material sheets on both sides of the opened intermediate seam or synchronously move towards each other to reset along the X-axis. The X-axis tensioning and closing drive mechanism and the intermediate pressure core 22 are respectively mounted on the mounting base 24. The bottom of the intermediate pressure core 22 extends downward beyond the bottom of the two material support members 21.

[0039] The X-axis opening and closing drive mechanism includes an opening and closing motor 23, a transmission assembly 231, and a screw 232. The transmission assembly 23 includes a first transmission wheel, a second transmission wheel, and a synchronous belt connecting the first and second transmission wheels. The first transmission wheel is connected to the opening and closing motor 23, and the second transmission shaft is connected to the screw 232. The opening and closing motor 23 drives the screw 232 to rotate around the X-axis via the transmission assembly 231. The screw 232 is provided with two reverse threads spaced left and right. Two support members 21 are respectively adapted to the two reverse threads, so that when the opening and closing motor 23 is working, the two support members 21 move towards each other or away from each other along the screw 232. The mounting base 24 is provided with an X-axis guide rail 241 extending along the X-axis, and the two support members 21 translate along the X-axis guide rail 241. A sensor 242 is provided on the mounting base 24, and a sensing part 215 is provided on at least one support member 21. The sensing part 215 cooperates with the sensor 242 to sense the position of the support member. The lower end of the support member 21 is the support part, and the upper end is the mounting part 211. The mounting part 211 is connected to the X-axis opening and closing drive mechanism. The support part is elastically floating vertically relative to the mounting part 211. Correspondingly, a first Z-axis guide rail 212 is provided on the mounting part 211 for the support part to float vertically along it. A first floating spring 213 is connected between the mounting part 211 and the support part. A lower limit adjustment part 214 and / or an upper limit adjustment part are provided on the mounting part 211 to adjust the vertical floating stroke of the support part.

[0040] The intermediate pressure core 22 is elastically floating vertically relative to the mounting base 24. A second floating spring 221 connects the intermediate pressure core 22 and the mounting base 24. An adjusting bolt 222 is provided on the mounting base 24 to adjust the tension of the second floating spring 221. A lower limit part 223 is provided on the mounting base 24 to limit the maximum downward floating of the intermediate pressure core 22. Of course, the lower limit part 223 can be designed to be adjustable to flexibly adjust the downward floating limit. A second Z-axis guide rail 224 is provided on the rear side of the mounting base 24 along which the intermediate pressure core 22 floats vertically.

[0041] In use, a manual or robotic arm places the cap pieces at the feeding station and flips them open at a small angle, forming a V-shape. The material support mechanism 20 moves downward under the drive of the Z-axis drive mechanism 13, and the intermediate pressure core 22 presses against the middle seam. The two material support members 21 act on the two cap pieces and, under the drive of the X-axis opening and closing drive mechanism, synchronously move away from each other along the X-axis, thus forming a cap piece flattening area between the two material support members 21 and the intermediate pressure core 22. The cap piece flattening areas on both sides are used for subsequent double-needle sewing operations. Then, the material support mechanism 20, driven by the Y-axis drive mechanism 12, translates along the Y-axis to below the sewing machine head 50, feeding the expanded cap piece to below the sewing machine head 50. The presser foot and / or positioning component below the sewing machine head 50 positions the expanded cap piece (then the material support mechanism 20, driven by the Y-axis drive mechanism 12, translates back to its original position along the Y-axis), and double-needle sewing is performed, followed by the unloading of the sewn material. Therefore, the feeding mechanism essentially completes the process of expanding the cap piece to a state suitable for double-needle sewing with the sewing machine head 50 and feeding the cap piece in this state to below the sewing machine head 50. Regarding the sewing machine head 50 and its presser foot, positioning component, etc., mature technologies can be used without modification. For mature double-needle sewing machines, this feeding mechanism is an added functional mechanism.

[0042] Below the material support mechanism 20, a feeding guide panel 100 is provided, located between the flipping mechanism and the sewing device. The feeding guide panel 100 has a guide groove 1 extending along the Y-axis. Below the guide groove 1, away from the sewing machine head 50, is a folding mechanism that folds up the middle sewing edges of the two material pieces. Below the guide groove 1, a retaining groove 2 is provided to hold and position the folded edge. When the middle sewing edges of the two material pieces are folded from a vertically downward position, and then the material support mechanism 20 feeds the workpiece along the Y-axis to below the sewing machine head 50, the middle sewing edges of the two material pieces are conveyed along the retaining groove 2, remaining horizontal or nearly horizontal.

[0043] Therefore, this feeding mechanism, through the setup of the Y-axis drive mechanism, Z-axis drive mechanism, and material support mechanism, enables the pressing, positioning, spreading, and Y-axis translation feeding of workpieces such as cap pieces before double-needle stitching. It is easy to integrate with mature double-needle stitching equipment with easily controllable processing quality (e.g., fabric strip supply devices and sewing devices can all adopt mature technologies). In particular, the setting of the intermediate pressure core can press and position the workpiece at the middle stitching point to avoid displacement. At the same time, it is beneficial for the two material support components to smoothly and accurately spread the two pieces, which is beneficial for subsequent double-needle stitching and edging, and improves the sewing processing quality.

[0044] Please continue to refer to Figure 1 As shown, the The fabric supply device and the sewing device can employ mature technologies, which will not be described in detail here.

[0045] Next, the working process of the double-needle stitching equipment in this embodiment, which is easy to control in terms of processing quality, will be introduced: 1. In the material feeding state, the left side plate 401 is set vertically upwards, and the right side plate 402 is set horizontally; two single-sided sewn material pieces (such as hat pieces) are placed flat on the right side plate 402, with the middle sewn edge of the hat piece against the left side plate 401 as the placement positioning reference; 2. Since the cap covers the sensing hole, the workpiece sensing unit (e.g., a photoelectric sensing unit) senses that the material has been placed in place. Then, the control system controls the second motor 42 to work, driving the right side plate 402 to rotate upward 90 degrees and be in a vertical state. At this time, it overlaps with the right side of the left side plate 401, and the cap is sandwiched between the left side plate 401 and the right side plate 402. 3. The clamp 431 clamps the middle sewing edge of the two pieces of material, and the push-folding cylinder 44 drives the clamping cylinder 45 to swing and shift, so that the middle sewing edge of the two pieces of material is pushed up from the vertical downward state.

[0046] 4. The flipping drive unit 47 drives the two sets of clamps 48 to flip upward and move closer together to further clamp the left side plate 401 and the right side plate 402, so that the left side plate 401 and the right side plate 402 are more closely attached to the material sheet; 5. The vacuum adsorption unit 411 starts working, and the two caps are stably adsorbed on the left side plate 401 and the right side plate 102 respectively; 6. The left side plate 401 and the right side plate 402 are flipped downwards away from each other at an angle of 20-60 degrees. Both extend obliquely above the shaft 403 to form a V-shape. At this time, the two caps are respectively attached to the left side plate 401 and the right side plate 402, and open into a V-shape as the left side plate 401 and the right side plate 402 are flipped downwards. 7. The material support mechanism 20 moves downward under the driving action of the Z-axis drive mechanism 13, and the intermediate pressure core 22 presses on the intermediate seam; the left side plate 401 and the right side plate 402 continue to flip downward away from each other until they are both in a horizontal state. During the process of approaching the horizontal state, the lifting drive unit 45 drives the support member 46 to rise to support the bottom of the left side plate 401 and the right side plate 402 respectively, ensuring that they are in a horizontal and stable state, and avoiding downward tilting and collapse during the next material release; the two material support members 21 act on the two cap pieces and, under the driving action of the X-axis opening and closing drive mechanism, synchronously open the two material pieces away from each other along the X-axis, so that a cap piece flat area is formed between the two material support members 21 and the intermediate pressure core 22. The cap piece flat area on both sides is used for subsequent double needle sewing operations.

[0047] 8. Under the driving action of the Y-axis drive mechanism 12, the material support mechanism 20 translates along the Y-axis to below the sewing machine head 50, sending the expanded cap piece to below the sewing machine head 50. The presser foot and / or positioning component below the sewing machine head 50 positions the expanded cap piece (then the material support mechanism 20 is translated back along the Y-axis under the driving action of the Y-axis drive mechanism 12), and double-needle sewing is performed. The The fabric strip supply device simultaneously provides fabric strips, which are then sewn onto the cap piece, forming two sewing tracks located on the left and right sides of the central seam, respectively.

[0048] Additionally, it should be noted that: After the left side plate 401 and the right side plate 402 continue to flip downwards away from each other until both are in a horizontal state, the left side plate 401 flips upwards 90 degrees to be set vertically. At this time, the left side plate 401 and the right side plate 402 are in a waiting state for the next feeding. Items 3 and 4 mentioned above can be performed simultaneously or in reverse order.

[0049] The key design feature of this invention lies in its precise material turning, supporting, and feeding through the setup of a flipping mechanism and a feeding mechanism, thereby improving the processing quality of double-needle stitching. Specifically, two motors control the left and right side plates respectively, and horizontal and vertical positioning mechanisms are configured for the two key states of the flipping mechanism, improving the accuracy of material feeding and supporting. Before double-needle stitching, the cap piece and other workpieces are pressed down, positioned, opened, and fed along the Y-axis. This design is easily integrated with mature double-needle stitching equipment that allows for easy quality control. In particular, the intermediate pressure core provides pressure and positioning at the middle stitching point of the workpiece, preventing displacement. Simultaneously, it facilitates the stable and precise opening of the two material pieces by the two supporting components, further improving the quality of double-needle stitching operations.

[0050] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A double-needle sewing machine with easily controllable processing quality, comprising a frame and a fabric strip supply device and a sewing device mounted on the frame, characterized in that, The frame is also equipped with a flipping mechanism, a feeding mechanism, and a control system. The control system is connected to the flipping mechanism, the feeding mechanism, the fabric supply device, and the sewing device, respectively. The flipping mechanism includes a left side plate and a right side plate, which can flip up and down around an axis. It also includes a first motor for driving the left side plate to flip up and down and a second motor for driving the right side plate to flip up and down. Both the left side plate and the right side plate are provided with vacuum adsorption units for adsorbing the sheet material; or, both the left side plate and the right side plate are provided with puncture positioning units for piercing the sheet material. A horizontal positioning mechanism and a vertical positioning mechanism are provided below the left and right side plates; the horizontal positioning mechanism includes a lifting drive unit and a support component, and the lifting drive unit drives the support component to move up and down; the vertical positioning mechanism includes a flipping drive unit and two sets of clamps, and the flipping drive unit drives the two sets of clamps to flip up and down. The feeding mechanism includes a material support mechanism, which is connected to a Y-axis drive mechanism and a Z-axis drive mechanism. The material support mechanism includes two material support components spaced apart along the X-axis, an intermediate pressure core located between the two material support components, an X-axis tensioning and closing drive mechanism, and a mounting base. The two material support components are connected to the X-axis tensioning and closing drive mechanism. The X-axis tensioning and closing drive mechanism drives the two material support components to move away from the material pieces on both sides of the middle seam along the X-axis or to move towards each other and reset synchronously. The X-axis tensioning and closing drive mechanism and the intermediate pressure core are respectively mounted on the mounting base.

2. The double-needle stitching equipment for easy quality control according to claim 1, characterized in that, The first motor is connected to a first drive wheel, a first transmission wheel, and a first synchronous belt; the first drive wheel is connected to the first motor, the first transmission wheel is rotatably sleeved on the shaft and connected to the left side plate, and the first synchronous belt is connected between the first drive wheel and the first transmission wheel; The second motor is connected to a second drive wheel, a second transmission wheel, and a second synchronous belt; The second drive wheel is connected to the second motor, the second transmission wheel is rotatably sleeved on the shaft and connected to the right side plate, and the second synchronous belt is connected between the second drive wheel and the second transmission wheel.

3. The double-needle stitching equipment for easy quality control according to claim 1, characterized in that, The shaft is connected to the sewing machine head end to a folding mechanism that folds up the sewing edge between two pieces of material; the folding mechanism includes a clamping cylinder and a pushing cylinder. The clamping cylinder is connected to a pair of clamps that open and close along the X-axis, which are used to clamp the sewing edge between the two pieces of material. The pushing cylinder is connected to the clamping cylinder to drive the clamping cylinder to swing and move.

4. The double-needle stitching equipment for easy quality control according to claim 3, characterized in that, The clamping cylinder is mounted on the cylinder seat, which is equipped with a connecting shaft and a connecting crank. The telescopic rod of the flat push cylinder is connected to the connecting shaft through a fisheye connector. The fisheye connector is rotatable relative to the connecting shaft. The upper end of the connecting crank is provided with a shaft hole, and it is rotatably sleeved on the shaft body facing the sewing machine head end through the shaft hole.

5. The double-needle stitching equipment for easy quality control according to claim 1, characterized in that, A workpiece sensing unit is provided below the right side plate. Correspondingly, a sensing hole is provided on the right side plate. When the workpiece sensing unit senses that the workpiece has been placed on the right side plate, the control system controls the right side plate to automatically flip upward.

6. The double-needle stitching equipment for easy quality control according to claim 2, characterized in that, The left side plate is connected to a first ring, and one end of the first transmission wheel extends axially to a first extension. The first ring is fitted onto the first extension and fixedly connected. The left side plate is also connected to a second ring, and a first bearing is fitted onto the shaft. The second ring is fitted onto the first bearing.

7. The double-needle stitching equipment for easy quality control according to claim 2, characterized in that, The right side plate is connected to a third ring, and one end of the second drive wheel extends axially to a second extension. The third ring is fitted onto the second extension and fixedly connected. The right and left side plates are also connected to a fourth ring, and a second bearing is fitted onto the shaft. The fourth ring is fitted onto the second bearing.

8. The double-needle stitching equipment for easy quality control according to claim 3, characterized in that, A feeding guide panel is provided between the flipping mechanism and the sewing device. The feeding guide panel has a guide groove extending along the Y-axis, which is positioned directly opposite the middle gap between the left and right side plates.

9. The double-needle stitching equipment for easy quality control according to claim 8, characterized in that, A retaining groove is provided below the guide groove to keep the folded edge in position.

10. A double-needle stitching method that facilitates quality control, characterized in that, The method utilizes the double-needle stitching equipment described in any one of claims 1 to 9, which allows for easy control of processing quality, and includes the following steps: Step 1: When the material is being laid out, the left side panel is set vertically upwards and the right side panel is set horizontally. Place the two single-sided sewn pieces flat on the right side panel, with the middle sewn edge of the two pieces against the left side panel as the placement and positioning reference. Step 2: The control system controls the second motor to drive the right side plate to rotate upward 90 degrees and stack vertically on the right side of the left side plate, with the two pieces sandwiched between the left and right side plates. Step 3: The flip drive unit drives the two sets of chucks to flip upwards and move closer together to further clamp the left and right side plates; Step 4: The vacuum adsorption unit or the puncture positioning unit starts working, and the two pieces are stably adsorbed onto the left side plate and the right side plate respectively. Step 5: The left and right side plates are flipped downwards away from each other at an angle of 20-60 degrees, and both extend inclinedly to the top of the shaft to form a V-shape; at this time, the two pieces are attached to the left and right side plates respectively, and open into a V-shape as the left and right side plates are flipped downwards. Step 6: The material support mechanism moves downward under the drive of the Z-axis drive mechanism, and the middle pressure core presses on the middle seam of the two material pieces; the left and right side plates continue to flip downward away from each other until they are both in a horizontal state. During the process of approaching the horizontal state, the lifting drive unit drives the support members to rise to support the bottom of the left and right side plates respectively; the two material support members act on the two material pieces and, under the drive of the X-axis opening and closing drive mechanism, synchronously open the two material pieces away from each other along the X-axis, so that a cap-piece flat area is formed between the two material support members and the middle pressure core; Step 7: Under the drive of the Y-axis drive mechanism, the material support mechanism moves along the Y-axis to below the sewing machine head of the sewing device, and sends the stretched material sheet to below the sewing machine head. The presser foot and / or positioning component below the sewing machine head positions the stretched material sheet. Under the drive of the Y-axis drive mechanism, the material support mechanism moves along the Y-axis to reset. The sewing device performs double-needle sewing, and the fabric strip supply device simultaneously provides fabric strips to sew the fabric strips onto the material sheet, forming two sewing tracks located on the left and right sides of the middle seam respectively.

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