An automatic seam assembly apparatus control method

Abstract

The application discloses an automatic seam splicing equipment control method, which comprises the following steps: S1, one-time sewing is performed, the position of a first cloth piece is detected, and a first working speed is determined; S2, whether deviation occurs is determined according to the position of the first cloth piece, and deviation of the cloth piece is corrected; S3, a middle deviation correction device follows the first working speed to correct the deviation, the position of the middle deviation correction device is detected, and whether the middle deviation correction device needs to exit after avoiding is determined; S4, after the middle deviation correction device exits, secondary sewing is started, the position of a second cloth piece and a second working speed are detected; S5, whether deviation occurs is determined according to the position of the second cloth piece, and deviation of the cloth piece is corrected; S6, tail deviation correction follows the second working speed to correct the deviation, the position of the tail deviation correction device is detected, and whether the tail deviation correction device needs to exit after avoiding is determined; and S7, sewing is completed after the tail deviation correction device exits after avoiding. The automatic seam splicing correction can adapt to size deviation of upper and lower cloth pieces of different lengths within a range, and effectively reduces the influence of individual differences of the cloth pieces on automatic sewing.

Description

Technical Field

[0001] This invention relates to the technical field of automatic seam sewing equipment control methods, and in particular to an automatic seam sewing equipment control method. Background Technology

[0002] In T-shirt sewing, the front and back seams of a T-shirt require a serge operation because the side seams of the front and back pieces are of different lengths. This serge operation aligns the starting and ending seams of the front and back pieces through sewing. In garment factories, this serge operation is traditionally done manually. This requires a high level of skill, is time-consuming, and results in significant variations in garment quality between different workers. Currently, automated front and back seam sewing devices on the market use robotic arms to press down templates for sewing. These devices have fixed requirements on the shape of the front and back fabric pieces and can only perform automated sewing for general pieces without serge operations. Furthermore, the number of templates is insufficient to accommodate the complex and diverse garment styles available in the market.

[0003] For example, an "Automatic Sewing and Cutting System and Method and Its Application" disclosed in Chinese patent literature, publication number CN105926174B, discloses a folding device including a suction device for fixing the cut pieces, a positioning device for defining the placement position of the cut pieces, and an action device for folding the cut pieces; a sewing device for sewing the folded cut pieces according to a predetermined trajectory; a cutting device for cutting the sewn cut pieces according to a predetermined trajectory; a feeding device for sequentially transporting the cut pieces from the folding device to the sewing device and the cutting device; and a control device electrically connected to the folding device, the sewing device, the cutting device, and the feeding device. However, this solution does not consider the problem of fabric offset during the cutting process. Summary of the Invention

[0004] To address the issues of low efficiency in front and rear panel redundancy operations and difficulty in resolving fabric offset, this invention provides an automatic sewing equipment control method. By adjusting the distance difference of the clamps, it adapts to fabric panels of different lengths, allowing the sewing device to be unrestricted by the requirement that the side seam lengths of the front and rear panels be consistent. The method straightens the fabric panel and uses photoelectric detection in conjunction with a motor to move it left and right to correct the shape differences between the front and rear fabric panels.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An automatic sewing equipment control method includes the following steps: S1. Performing a first sewing operation, detecting the position of a first fabric piece, and determining a first working speed; S2. Determining whether a deviation has occurred based on the position of the first fabric piece, and correcting the deviation of the fabric piece; S3. A middle correction device follows the first working speed to correct the deviation, detecting the position of the middle correction device and determining whether it needs to be withdrawn; S4. After the middle correction device withdraws, starting a second sewing operation, detecting the position of a second fabric piece and a second working speed; S5. Determining whether a deviation has occurred based on the position of the second fabric piece, and correcting the deviation of the fabric piece; S6. A tail correction device follows the second working speed to correct the deviation, detecting the position of the tail correction device and determining whether it needs to be withdrawn; S7. The sewing is completed after the tail correction device withdraws. In the first sewing stage, the front half of the fabric piece is sewn. During this stage, the local position of the fabric piece is detected and corrected, with the correction device moving synchronously with the fabric. Once the correction device reaches its predetermined position, the first sewing stage is completed, thus finishing the front half of the fabric piece. In the second sewing stage, the rear half of the fabric piece is sewn. During this stage, the overall position of the fabric piece is detected and corrected, with a second correction device moving synchronously with the fabric. Once the second correction device reaches its predetermined position, the second sewing stage is completed. This achieves segmented sewing and correction of the fabric piece. The correction device can be controlled based on the positions of the upper and lower pieces of the fabric piece, allowing for localized correction followed by overall correction, improving the efficiency of the sewing process. The position of the correction device determines the sewing stage, facilitating adjustments to the correction position based on the length of the fabric piece. Segmented correction improves accuracy and prevents the middle part of the fabric piece from shifting.

[0007] Preferably, step S1 includes: before sewing, checking the positions of the top and bottom sides of the fabric piece to be sewn; straightening each side of the fabric piece and determining its position; and after starting sewing, determining the overall movement speed of the fabric piece as the first working speed. Before checking the positions of the top and bottom sides of the fabric piece to be sewn, fixing both ends of each side of the fabric piece to be sewn to the same position; straightening each side of the fabric piece and checking its position; comparing the positions of the top and bottom sides and sewing them together until the positions of the top and bottom sides are the same. By straightening the top and bottom sides of the fabric piece from their ends and then sewing them together, fabric pieces of different lengths can also be sewn together. At the same time, checking the positions of the top and bottom sides of the sewn fabric piece allows for the correction of fabric pieces of different lengths on both sides.

[0008] Preferably, step S2 includes setting offset thresholds for both sides of the fabric piece, adjusting the fabric piece at the seam after either side reaches the offset threshold, and correcting the deviation according to the movement parameters of the seam adjustment. Setting vertical offset thresholds for both sides forms a threshold range that includes the fabric piece's seam position, ensuring that the corrected position of the fabric piece matches the seam position, thus preventing uneven seams caused by fabric offset and resulting in sewing deviations.

[0009] Preferably, S3 includes a central correction device that moves with the fabric piece at a first working speed, detects the position of the central correction device at a fixed position, and completes one sewing cycle when the central correction device reaches the fixed position. By detecting the position of the central correction device, the working position of the first half of the fabric piece can be obtained, and local correction of the fabric piece can be achieved. This allows the correction to follow the movement of the fabric piece, improving sewing accuracy and avoiding inaccurate correction caused by excessively long fabric pieces or different lengths on both sides of the fabric piece. It also prevents correction in one area from affecting the rest of the fabric piece.

[0010] Preferably, step S4 includes controlling the tail correction device after the middle correction device retracts. At this time, the positions of both sides of the fabric piece are detected and recorded as the second fabric piece position, and the sewing speed at this time is recorded as the second working speed. After the middle correction device retracts, the detection of the fabric piece position becomes the detection of the position of the entire area of ​​the fabric piece to be sewn, including the positions of both sides of the fabric piece between the positions where the tail correction device and the middle correction device retracted. By detecting the position of the fabric piece at this time, the correction efficiency is improved, and segmented correction is achieved.

[0011] Preferably, step S5 includes setting a second offset threshold. When the position of the second fabric piece exceeds the second offset threshold, the remaining area to be sewn on the fabric piece is sewn while simultaneously correcting the deviation. A tail-end correction device corrects the deviation of the entire fabric piece from its end. All positions of the remaining area to be sewn on the fabric piece are detected, i.e., straight-line detection is performed. Correction is performed when any position on the fabric piece exceeds the second offset threshold. The correction result is judged based on the position closest to the tail-end correction device, ensuring that both sides of the fabric piece are within the second offset threshold. The tail-end correction device corrects the deviation of the straightened fabric piece, improving correction efficiency and effectiveness.

[0012] Preferably, S6 includes controlling the tail-end correction device to perform overall correction on the fabric piece from the end of the fabric piece, correcting deviations at any position on the fabric piece. The control of the middle correction device and the tail-end correction device are not performed simultaneously; only one of the middle or tail correction devices is controlled. The tail-end correction device is activated only after the middle correction device has exited its position. The position detection of the tail-end correction device is the same as that of the middle correction device, and the redundant control releases the clamp after the tail-end correction device reaches its position. This allows for correction on both sides of the remaining fabric piece, achieving segmented correction.

[0013] Preferably, both the first and second correction devices employ a multi-segment lateral movement correction method driven by a motor during operation. Before the first correction device begins operation, a control redundancy device is used to control the sewing of the fabric piece. This sewing control includes redundancy operations on the fabric piece. The redundancy device comprises upper and lower clamps, and the redundancy operations include straightening the fabric piece and aligning its upper and lower sides. The control redundancy device moves at the same speed as the fabric piece. This multi-segment lateral movement correction method achieves rapid and effective correction, and decouples the fabric piece transport and lateral correction within the device, ensuring they do not interfere with each other. This improves the correction effect while maintaining sewing efficiency.

[0014] The present invention has the following advantages:

[0015] (1) By adjusting the distance difference of the clamps, the device can adapt to fabric pieces of different lengths, so that the sewing device is not limited to the requirement that the side seam lengths of the front and rear pieces be consistent. The device straightens the fabric pieces and moves left and right through photoelectric detection and motor to correct the shape difference between the front and rear fabric pieces. (2) The device can be controlled to correct the deviation according to the position of the upper and lower pieces of the fabric to be sewn. It realizes the correction of the fabric pieces first locally and then the correction of the fabric pieces as a whole, which improves the correction efficiency in the sewing process. The sewing stage can be determined according to the position of the correction device, which makes it easy to adjust the correction position according to the length of the fabric pieces to be sewn. The segmented correction improves the accuracy of the correction and avoids (3) By straightening the upper and lower sides of the fabric piece from the end and then stitching them together, fabric pieces of different lengths can also be stitched together. At the same time, the position of the upper and lower sides of the fabric piece after stitching is detected, thereby realizing the correction of the different lengths of fabric pieces on both sides; (4) The method of aligning the double pieces by using the clamps has not yet been applied to the automated equipment for sewing double pieces, and can adapt to the size deviation of the upper and lower fabric pieces of different lengths within the range, effectively reducing the impact of individual differences of fabric pieces on automated sewing; it can meet the double-piece sewing of normal-sized fabrics, and can also meet the double-piece sewing of smaller-sized (children's clothing) fabrics. Attached Figure Description

[0016] The accompanying drawings described below are merely exemplary. Those skilled in the art can derive other embodiments based on the provided drawings without any inventive effort.

[0017] Figure 1 This is a schematic diagram of the steps of the automatic seam sewing equipment control method in this invention.

[0018] Figure 2 This is a logical schematic diagram of the automatic seam sewing equipment control method in this invention.

[0019] Figure 3 This is a schematic diagram of the correction logic in the embodiment.

[0020] Figure 4 This is a schematic diagram of the overall structure of the automatic stitching device in this invention.

[0021] In the picture:

[0022] 1-Overlock sewing machine; 2-Redundant device; 3-Tail correction device; 4-Intermediate correction device. Detailed Implementation

[0023] The following specific embodiments illustrate the implementation of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] As shown in Figure 1, in a preferred embodiment, the present invention discloses an automatic sewing equipment control method, including the following steps: S1, performing one sewing operation, detecting the position of a first fabric piece, and determining a first working speed; S1 includes, before performing one sewing operation, detecting the positions of the upper and lower sides of the fabric piece to be sewn, straightening each side of the fabric piece and determining its position, and after starting one sewing operation, detecting the overall movement speed of the fabric piece as the first working speed. Before detecting the positions of the upper and lower sides of the fabric piece to be sewn, fixing both ends of each side of the fabric piece to be sewn to the same position, straightening each side of the fabric piece and detecting its position, comparing the positions of the upper and lower sides and sewing them together until the positions of the upper and lower sides are the same. By straightening the upper and lower sides of the fabric piece from their ends and then sewing them together, fabric pieces of different lengths can also be sewn together. At the same time, detecting the positions of the upper and lower sides of the sewn fabric piece, thereby achieving the correction of fabric pieces of different lengths on both sides.

[0025] When using the machine, proceed with the pre-sewing preparation process by placing the fabric piece on the overlock sewing machine 1. Place the front ends of both sides of the fabric piece in the positioning device 2 on the overlock sewing machine 1. Fix the ends of both sides of the fabric piece with the upper and lower clamps of the positioning device 2. Use the control cylinder to operate the clamps of the positioning device to align the ends of both sides of the fabric piece, so that the upper and lower sides are in a positioning state. Then control the movement of the positioning device to ensure that the fabric piece is in a straight state. Finally, clamp the middle correction device in the middle of the fabric piece and control the middle correction device to move back to straighten the fabric piece, ensuring that the correction action is effective.

[0026] S2. Determine whether a shift has occurred based on the position of the first fabric piece, and correct the shifted fabric piece. S2 includes setting shift thresholds for both sides of the fabric piece, adjusting the seam of the fabric piece after either side reaches the shift threshold, and performing corresponding correction based on the movement parameters of the seam adjustment. Setting vertical and horizontal shift thresholds for both sides forms a threshold range that includes the seam position of the fabric piece. This ensures that the corrected position of the fabric piece matches the seam position, preventing uneven seams caused by fabric shift and subsequent sewing deviations.

[0027] S3: The middle correction device follows the first working speed to correct the deviation. The position of the middle correction device is detected, and it is determined whether it needs to be withdrawn. S3 includes the middle correction device moving forward with the fabric according to the first working speed, the position of the middle correction device being detected at a fixed position, and one sewing cycle being completed when the middle correction device reaches the fixed position. By detecting the position of the middle correction device, the working position of the first half of the fabric can be obtained, and local correction of the fabric can be achieved. This allows the correction to follow the movement of the fabric, improving the accuracy of sewing and avoiding inaccurate correction caused by excessively long fabric pieces or different lengths on both sides of the fabric piece. It also avoids the correction of one part affecting the rest of the fabric piece.

[0028] During use, a positioning sensor is installed at a fixed position. The first sewing process, i.e., one sewing, is before the positioning sensor detects that the middle correction device has reached its position. At this time, the movement speed of the positioning device, the middle correction device, and the fabric piece is kept synchronized and all connected to the encoder. The encoder controls the motors of the positioning device, the middle correction device, and the fabric piece to keep the fabric piece moving forward. During this process, due to interference from its own and external factors, the upper and lower layers of fabric pieces will deviate from the ideal position along the Y axis. The correction device includes a correction sensing plate, which is equipped with correction limit sensors. These limit sensors determine the threshold for fabric offset. The limit sensors are located at left and right limit points. When the fabric is positioned between these points, it is in a normal, unoffended state. If the correction sensing plate detects that the fabric has moved beyond the offset threshold, and the upper fabric piece is positioned beyond the left side of the left limit point, a negative offset is determined. In this case, the middle correction device clamping the upper fabric piece moves in the opposite direction of the offset, returning it to its normal state. If the upper fabric piece is positioned to the right of the right limit point, a positive offset is determined. The middle correction device clamping the upper fabric piece then moves in the opposite direction of the offset. When the lower fabric piece experiences the same offset, the middle correction device moves the clamping part to complete the correction. This achieves localized correction.

[0029] S4. After the middle correction device retracts, secondary sewing begins, detecting the position of the second fabric piece and the second working speed. S4 includes controlling the tail correction device after the middle correction device retracts. At this time, the positions of both sides of the fabric piece are detected and recorded as the second fabric piece position, and the sewing speed at this time is recorded as the second working speed. After the middle correction device retracts, the detection of the fabric piece position changes to the detection of the overall position of the fabric piece in the area to be sewn, including the positions of both sides of the fabric piece between the positions where the tail correction device and the middle correction device retracted. Detecting the current position of the fabric piece improves correction efficiency and achieves segmented correction.

[0030] S5. Determine whether a deviation has occurred based on the position of the second fabric piece, and correct the deviation of the fabric piece. S5 includes setting a second deviation threshold. When the position of the second fabric piece exceeds the second deviation threshold, correction is performed simultaneously while sewing the remaining area to be sewn on the fabric piece. The entire fabric piece is corrected from its end using a tail-correction device. All positions of the remaining area to be sewn on the fabric piece are detected, i.e., straightness is detected. Correction is performed when any position on the fabric piece exceeds the second deviation threshold. The correction result is judged based on the position closest to the tail-correction device to ensure that both sides of the fabric piece are within the second deviation threshold. The tail-correction device corrects the deviation of the straightened fabric piece, improving the efficiency and effectiveness of the correction.

[0031] S6. The tail-end correction follows the second working speed for correction, detecting the position of the tail-end correction device and determining whether it needs to avoid or exit. S6 includes controlling the tail-end correction device to correct the entire fabric piece from the end of the fabric piece, correcting any deviation at any position on the fabric piece. The control of the middle correction device and the tail-end correction device are not performed simultaneously; only the middle correction device or the tail correction device is controlled independently. The tail-end correction device is activated after the middle correction device has avoided or exited. The position detection of the tail-end correction device is the same as that of the middle correction device, and the redundant control releases the clamp after the tail-end correction device reaches its position. It can correct both sides of the remaining fabric piece, achieving segmented correction.

[0032] In operation, when the positioning sensor detects that the middle correction device is in position, the first section of sewing ends. The middle correction device is connected to a correction avoidance device, which moves the middle correction device away from the fabric, preventing it from interfering with the operation of the tail correction device. At this time, the movement of the positioning device and the movement of the fabric are synchronized with the overlock sewing machine's operation based on encoder feedback, causing the fabric to move forward. The fabric correction function is completed by the tail correction device. The tail-end correction device also features a correction sensing plate with left and right limit points composed of left and right limit sensors. When the upper fabric piece is in the middle of the left and right limit points, the fabric piece is in a normal state with no offset. When the upper fabric piece is to the left of the left limit point, the fabric piece experiences a negative offset. When the fabric piece is in the middle of the left and right limit points, the fabric piece is in a normal state with no offset. After the correction sensing plate detects that the fabric piece has moved and exceeded the offset threshold, if the upper fabric piece is beyond the left side of the left limit point, it is determined that the fabric piece has experienced a negative offset. At this time, the middle correction device is controlled to move the part clamping the upper fabric piece in the opposite direction of the offset, returning to the normal state. If the upper fabric piece is to the right of the right limit point, it is determined that the fabric piece has experienced a positive offset. At this time, the middle correction device is controlled to move the part clamping the upper fabric piece in the opposite direction of the offset. When the lower fabric piece experiences the same offset, the middle correction device is controlled to move the part clamping the lower fabric piece to complete the correction. Once the tail correction device is in place, the upper and lower clamps of the redundant device release, and the overlock sewing machine completes the tail sewing.

[0033] S7. The tail correction device avoids and exits, and the sewing is completed. In the first sewing stage, the front half of the fabric piece is sewn. During this stage, the local position of the fabric piece is detected and corrected, with the correction device moving synchronously with the fabric. Once the correction device reaches its predetermined position, the first sewing stage is completed, thus finishing the front half of the fabric piece. In the second sewing stage, the rear half of the fabric piece is sewn. During this stage, the overall position of the fabric piece is detected and corrected, with a second correction device moving synchronously with the fabric. Once the second correction device reaches its predetermined position, the second sewing stage is completed. This achieves segmented sewing and correction of the fabric piece. The correction device can be controlled based on the positions of the upper and lower pieces of the fabric piece, allowing for localized correction followed by overall correction, improving the efficiency of the sewing process. The position of the correction device determines the sewing stage, facilitating adjustments to the correction position based on the length of the fabric piece. Segmented correction improves accuracy and prevents the middle part of the fabric piece from shifting.

[0034] When the first and second correction devices are in operation, they employ a multi-segment lateral movement correction method driven by a motor. Before the first correction device operates, a control redundancy device is used to control the sewing of the fabric. This sewing control includes redundancy operations on the fabric, with the redundancy device comprising upper and lower clamps. Redundancy operations include straightening the fabric and aligning its top and bottom edges. The control redundancy device moves at the same speed as the fabric. Compared to the commonly used motor-driven roller correction method, which suffers from the inability to correct deviations during turning and requires time, this method offers a faster and more effective correction response. Furthermore, rollers, which simultaneously transport the fabric forward, cannot produce excessive turning, limiting the correction effect. This method decouples the fabric transport movement from the lateral correction at the device level, ensuring they do not interfere with each other, thus improving the correction effect while maintaining sewing efficiency.

[0035] The redundant positioning device uses a cylinder to move the fabric pieces to align the upper and lower fabric pieces. Alternative methods exist, including motor-driven positioning and alignment, which can stretch and align the upper and lower fabric pieces. The method of aligning the redundant positions of two fabric pieces using grippers has not yet been applied to automated equipment for sewing two pieces, and it can accommodate dimensional deviations of upper and lower fabric pieces of varying lengths within a certain range, effectively reducing the impact of individual fabric piece differences on automated sewing.

[0036] In addition to sensors, methods such as gratings and vision can also be used to detect fabric offset.

[0037] This method allows for the double-piece sewing of both normal-sized and smaller (children's clothing) fabric pieces without requiring additional equipment during process switching.

[0038] In the second embodiment, the upper and lower pieces are clamped separately by clamps, and the ends of the upper and lower pieces are aligned by the movement of the air cylinder before sewing. The deviation correction method is achieved by moving the fabric clamping device left and right. For fabric pieces of different lengths, the method uses a combination of single-segment and multi-segment operation to achieve the desired effect.

[0039] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A control method for an automatic seam-sewing machine, characterized in that, The process includes the following steps: S1. Perform one sewing operation, detect the position of the first fabric piece, and determine the first working speed; before performing one sewing operation, detect the positions of the top and bottom sides of the fabric piece to be sewn, straighten each side of the fabric piece and determine its position, and after starting one sewing operation, detect the overall movement speed of the fabric piece as the first working speed; S2. Determine whether there is any deviation based on the position of the first fabric piece, and correct the deviation of the fabric piece; set deviation thresholds for both sides of the fabric piece, and adjust the fabric piece by splicing after either side reaches the deviation threshold, according to the movement parameters of the splicing adjustment. S3. The middle correction device performs correction according to the first working speed, detects the position of the middle correction device and determines whether it needs to be withdrawn; S4. After the middle correction device withdraws, the second sewing begins, and the position of the second fabric piece and the second working speed are detected; S5. Based on the position of the second fabric piece, it is determined whether a deviation has occurred, and the deviated fabric piece is corrected; S6. The tail correction device performs correction according to the second working speed, detects the position of the tail correction device and determines whether it needs to be withdrawn; S7. After the tail correction device withdraws, the sewing is completed.

2. The automatic seam-sewing equipment control method according to claim 1, characterized in that, The S3 includes a central correction device that moves forward with the fabric piece according to a first working speed, a central correction device that detects the position of the central correction device at a fixed position, and a sewing operation that is completed when the central correction device reaches the fixed position.

3. The automatic seam-sewing equipment control method according to claim 1, characterized in that, S4 includes controlling the tail correction device after the middle correction device is withdrawn. At this time, the positions of both sides of the fabric piece are detected and recorded as the second fabric piece position, and the sewing speed at this time is recorded as the second working speed.

4. The automatic seam-sewing equipment control method according to claim 1, characterized in that, S5 includes setting a second offset threshold. When the position of the second fabric piece exceeds the second offset threshold, the remaining area to be sewn on the fabric piece is sewn while the offset is corrected. The offset is corrected from the end of the fabric piece by the tail offset device.

5. The automatic seam-sewing equipment control method according to claim 4, characterized in that, S6 includes controlling the tail correction device to correct the overall deviation of the fabric piece from the end of the fabric piece, and correcting the deviation when the fabric piece deviates at any position.

6. The automatic seam-sewing equipment control method according to claim 5, characterized in that, When the middle correction device and the tail correction device are working, they adopt a method of multi-segment lateral movement correction driven by a motor to drive the gripper.

7. The automatic seam-sewing equipment control method according to claim 6, characterized in that, The sewing equipment is equipped with a redundancy device. Before the middle correction device works, the redundancy device is controlled to sew the fabric. The fabric piece is placed on the sewing equipment, and the front ends of both sides of the fabric piece are placed in the redundancy device on the sewing equipment. The ends of both sides of the fabric piece are fixed by the upper and lower clamps of the redundancy device. The clamps of the redundancy device are operated to align the ends of both sides of the fabric piece, so that the upper and lower sides are in a redundancy state. Then the redundancy device is controlled to move to ensure that the fabric piece is in a straight state.

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