An adaptive deviation rectifying method suitable for planar fabric laying

Abstract

This invention discloses an adaptive correction method for flat fabric pieces. A fabric moving mechanism is located on the front side of the sewing table. A small correction wheel and a near-end correction sensor are located on the sewing table surface near the right side of the presser foot of the overlock machine. A large correction wheel, a far-end correction sensor, and a far-end positioning sensor are located on the sewing table surface to the right of the small correction wheel. The correction method includes: when the fabric piece experiences a negative Y-axis offset, the small and large correction wheels rise, increasing the X-axis moving speed of the fabric moving mechanism; when the fabric piece experiences a positive Y-axis offset, the small and large correction wheels descend and roll into contact with the fabric piece, while the control mechanism slows down the X-axis moving speed of the fabric moving mechanism. This correction method can automatically adapt to fabric pieces of various sizes, correct the sewing edge position of the fabric piece in real time, effectively offset the differences in edge alignment between different fabric pieces, and effectively improve the effect of overlock sewing.

Description

Technical Field

[0001] This invention relates to the field of sewing device technology, and in particular to an adaptive correction method suitable for flat fabric pieces. Background Technology

[0002] Most automatic overlock sewing equipment on the market currently uses robotic arms or other auxiliary fabric movement mechanisms to replace manual sewing of fabric pieces. However, during use, the fabric pieces move according to a predetermined procedure. Due to the different materials and sizes of the fabric pieces being sewn, the fabric pieces will deviate to varying degrees during the sewing process, resulting in overlocking or underlocking of the fabric pieces, poor overlocking effect, and low yield. Therefore, most methods can only sew fabric pieces of the same size and type, lacking versatility and making them difficult to promote. To solve this problem, it is necessary to eliminate the influence of different fabric pieces on the edge alignment of the overlock sewing. Chinese patent document CN104389116A, published on March 4, 2015, discloses an automatic edge-aligning sewing machine. When the lower layer photodetector detects the lower layer fabric piece, a feedback signal controls the lower layer air pipe to blow air. When the edge-aligning sensor detects a fabric signal, a feedback signal stops the lower layer feeding motor. An automatic fabric detection and adjustment device adjusts the lower fabric piece in the Y direction. Above the upper fabric support plate, a drive wheel device has a drive wheel support seat. The lower part of the drive wheel support seat is connected to a cylinder. The extension and retraction of the cylinder rod can move the drive wheel support seat up and down, causing the fabric drive wheel on it to contact / separate from the fabric. When the upper layer photodetector detects the upper fabric piece, a feedback signal controls the cylinder to pull down, causing the drive wheel support seat to move downwards. Simultaneously, a feedback signal controls the upper layer air pipes I and II to blow air. When the edge-aligning sensor detects a fabric signal, a feedback signal stops the upper layer feeding motor. The automatic fabric detection and adjustment device adjusts the upper fabric piece in the Y direction. This patent uses sensor detection and longitudinal motor correction, but this method requires a mechanism to move the fabric to the opposite edge and stop the alignment, which affects the sewing efficiency. In addition, the fabric moving mechanism imposes a large limitation on the size of the fabric. Summary of the Invention

[0003] The purpose of this invention is to solve the problems of varying degrees of offset during the fabric sewing process in existing technologies, resulting in poor sewing effects and low product yield. It also addresses the issues of existing correction methods requiring a mechanism to move the fabric to the opposite edge and then stop, leading to low sewing efficiency, and the fabric moving mechanism having significant limitations on fabric size. The invention provides an adaptive correction method suitable for planar fabrics, which automatically adapts to fabrics of various sizes, corrects the sewing edge position in real time, effectively offsets differences in edge alignment between different fabrics, and effectively improves the sewing effect of the fabric edges.

[0004] The technical solution adopted by this invention to solve the above-mentioned technical problems is an adaptive correction method for planar fabric pieces, including a control unit, a sewing table, and an overlock sewing machine located behind the sewing table. A fabric movement mechanism is provided on the front side of the sewing table. A small correction wheel and a near-end correction sensor are provided on the sewing table near the right side of the presser foot of the overlock sewing machine. A large correction wheel and a far-end correction sensor are provided on the sewing table to the right of the small correction wheel. A far-end positioning sensor is provided on the sewing table in front of the far-end correction sensor. Both the small and large correction wheels are lifting wheels. Initially, the small and large correction wheels are in a raised state. The fabric movement direction is defined as the X-axis, the forward direction of the sewing table as the Y-axis, the near-end correction sensor and the far-end correction sensor are on the same straight line along the X-axis, and the far-end positioning sensor and the far-end correction sensor are on the same straight line along the Y-axis. The adaptive correction method for planar fabric pieces includes the following steps:

[0005] S1. When the remote correction sensor detects that the fabric is completely covered, it determines that the fabric has a negative Y-axis offset. The small correction wheel and the large correction wheel are in the raised state. At the same time, the control unit increases the X-axis moving speed of the fabric moving mechanism, so that the X-axis moving speed V2 of the front side of the fabric is greater than the X-axis moving speed V1 of the rear side of the fabric.

[0006] When the fabric shifts negatively along the Y-axis (which poses a risk of over-over-over-over for the overlock machine), correction begins. First, the small and large correction wheels used for back edge correction are raised. Then, the X-axis movement speed of the fabric movement mechanism is linearly increased, causing a speed mismatch between the two sides of the fabric along the X-axis. At this time, the speed V2 on the outer side of the X-axis (front of the sewing table) is higher than the speed V1 on the inner side of the X-axis (back of the sewing table). Since the near end of the fabric is fixed by the presser foot of the overlock machine at the sewing point, the speed V2 being higher than V1 will cause the fabric to rotate inward (the near end of the fabric moves negatively along the Y-axis, and the far end of the fabric moves positively along the Y-axis). This effect causes the far end of the fabric to move positively along the Y-axis. The longer the correction time sensed by the far-end correction sensor, the greater the increase in the V2 speed on the front side of the X-axis, the greater the speed difference between the two sides of the X-axis, and the greater the force of the offset correction. The fabric is eventually corrected from its offset.

[0007] S2. When the remote correction sensor does not detect the fabric covering and the remote positioning sensor detects that the fabric is covered, it is determined that the fabric has a positive Y-axis offset. The small correction wheel and the large correction wheel descend and make rolling contact with the fabric. At the same time, the control unit slows down the X-axis moving speed of the fabric moving mechanism so that the X-axis moving speed V2 on the front side of the fabric is less than the X-axis moving speed V1 on the rear side of the fabric. When the fabric shifts in the positive Y-axis direction (which poses a risk of missing stitches for the overlock machine), the small and large correction wheels are pressed down first. Since the left rims of the small and large correction wheels are deflected towards the rear of the sewing table, there is an angle between the radial plane of the small and large correction wheels and the normal direction of fabric movement. Therefore, the rolling motion of the small and large correction wheels on the fabric can move the fabric backward, thus correcting the shift. Then, by slowing down the X-axis movement speed of the fabric movement mechanism, the speed of the fabric along the X-axis becomes mismatched, and the speed change is opposite to the negative Y-axis shift of the fabric (i.e., V1 is higher than V2). This causes the fabric to rotate outward, ultimately completing the correction of the positive Y-axis shift of the fabric.

[0008] S3. When the remote correction sensor detects that the fabric piece is partially covered, it determines that the fabric piece position is accurate, and the X-axis moving speed of the fabric piece moving mechanism remains unchanged. This invention addresses three situations regarding the position of the fabric piece edge relative to the correction sensor: the correction sensor is completely covered, partially covered, or not covered. When the correction sensor is partially covered, the fabric piece position is determined to be normal, and no correction is needed. The specific judgment criteria for each of the three situations can be determined based on the actual conditions of the sensor and the fabric piece.

[0009] The above-mentioned correction method is applicable to fabric pieces whose width is greater than the distance between the presser foot of the overlock sewing machine and the fabric moving mechanism. By detecting multiple sensors and cooperating with the fabric moving mechanism, the sewing edge position of the fabric piece is corrected in real time, effectively offsetting the differences in the sewing edge position of different fabric pieces, automatically making adaptive adjustments to the deviation of the fabric piece, and improving the overlock sewing effect of the fabric piece.

[0010] Preferably, the adaptive correction method of the present invention further includes the following steps:

[0011] S4. When neither the remote correction sensor nor the remote positioning sensor detects that the fabric is covered, and the near correction sensor detects that the fabric is completely covered, it determines that the fabric is the end and generates a negative Y-axis offset. The small correction wheel and the large correction wheel are in the raised state. At the same time, the X-axis moving speed of the fabric moving mechanism is increased, so that the X-axis moving speed V2 of the front side of the fabric is greater than the X-axis moving speed V1 of the rear side of the fabric.

[0012] S5. When the remote correction sensor, remote positioning sensor and near correction sensor do not detect the fabric covering, it is determined that the fabric is the end and a positive Y-axis offset occurs. The small correction wheel descends and rolls to contact the fabric. At the same time, the X-axis moving speed of the fabric moving mechanism is slowed down, so that the X-axis moving speed V2 of the front side of the fabric is less than the X-axis moving speed V1 of the rear side of the fabric.

[0013] S6. When neither the remote correction sensor nor the remote positioning sensor detects that the fabric piece is covered, and the near-end correction sensor detects that the fabric piece is partially covered, it determines that the fabric piece is the end and the position is accurate, and the X-axis moving speed of the fabric piece moving mechanism remains unchanged.

[0014] When the fabric piece is partially bound and sewn, and it is nearing the end of the fabric piece, if the end of the fabric piece fails to cover the far-end correction sensor and the far-end positioning sensor, and the bound fabric piece is sewn to the point where the far-end positioning sensor cannot detect the fabric piece, then the near-end correction sensor and the small correction wheel are used to correct the deviation. The way the fabric piece moving mechanism and the near-end correction sensor work together is the same as the way it works with the far-end correction sensor. Considering that the fabric piece has moved to a position close to the presser foot of the overlock sewing machine at this time, the small correction wheel is pressed down to improve the efficiency of the movement correction and achieve a better correction effect.

[0015] Preferably, a small baffle plate is provided on the sewing table surface to the right of the presser foot of the overlock sewing machine. The small baffle plate has a wheel groove, a small correction wheel is set in the wheel groove, and a near-end correction sensor is set on the small baffle plate. The near-end correction sensor is located on the rear side of the left end of the wheel groove.

[0016] Preferably, a large baffle plate is provided on the right side of the small baffle plate, a large correction wheel is located on the front side of the middle of the large baffle plate, a sensor hole is provided on the sewing table surface on the right side of the large baffle plate, and a remote correction sensor is located in the sensor hole.

[0017] Preferably, both the small and large fabric guards include a rear guard edge for limiting the backward movement of the fabric and an upper guard edge for limiting the upward tilting of the fabric. The front side of the upper guard edge is provided with a guide edge to facilitate the entry of the fabric. The rear guard edge and the upper guard edge work together to limit the rear edge (sewing edge) of the fabric, preventing the fabric from deviating excessively backward. The guide edge can reduce the probability of fabric jamming in the overlock sewing machine and improve machine stability.

[0018] Preferably, both the large and small corrective wheels are rubber wheels. In the initial state, the left rims of both wheels are deflected towards the rear of the sewing table. The radial plane of the large corrective wheel makes an angle of 7-13 degrees with the X-axis, while the radial plane of the small corrective wheel makes an angle of 32-38 degrees with the X-axis. Initially, the large and small corrective wheels descend and contact the fabric. Rotation of these wheels causes the fabric to shift rearward, thus achieving the corrective function. Using rubber wheels increases the friction between the large and small corrective wheels and the fabric.

[0019] Preferably, the small correction wheel is mounted on the small correction wheel lifting cylinder via a connecting mechanism, and the small correction wheel lifting cylinder is fixed on the small sewing platform in the middle of the sewing table. The large correction wheel is mounted on the large correction wheel lifting cylinder via a connecting mechanism, and the large correction wheel lifting cylinder is fixed on the sewing table.

[0020] Preferably, the fabric moving mechanism is a synchronous belt positioned opposite the overlock sewing machine, parallel to the X-axis, with an adhesive coating on its outer surface. The synchronous belt has a large contact area with the fabric, allowing for better control of the fabric's moving speed; the adhesive coating on the outer surface of the synchronous belt increases the friction between the belt and the fabric.

[0021] The fabric movement mechanism has several alternative structures, including a motor coupled with rollers, a motor coupled with a track, or other speed-regulating devices that move the outer front end of the fabric piece. These can be installed on the upper part of the sewing table, on the table itself, or in another convenient position to contact the fabric piece. Near-end correction sensors, far-end correction sensors, and far-end positioning sensors are used to detect the fabric piece's position. Besides sensors, visual inspection, reflective photoelectric sensors, pressure sensors, and other mechanisms capable of acquiring fabric piece position information can also be used. In this invention, the terms "near-far" and "far-end" are relative, and the number of sensors can also be changed. The large and small correction wheels serve to assist in correcting the near-end alignment, and alternative methods such as blowing air or flicking exist.

[0022] The beneficial effects of this invention are that it effectively solves the problems of varying degrees of offset during the fabric sewing process in existing technologies, resulting in poor sewing effects and low product yield. It also addresses the issues of existing correction methods requiring a mechanism to assist the fabric in moving to the opposite edge and stopping the alignment process, leading to low sewing efficiency, and the significant limitations of the fabric moving mechanism on fabric size. This invention is an adaptive correction method applicable to planar fabrics, adaptable to fabrics of various sizes, and capable of real-time correction of the opposite edge position during fabric sewing. It can effectively offset the differences in the opposite edge alignment of different fabrics, effectively improving the edge sewing effect of the fabric. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of an application structure of the adaptive correction method for planar fabrics according to the present invention;

[0024] Figure 2 This is a schematic diagram of a wide fabric correction method for the adaptive correction method of the present invention applicable to planar fabrics;

[0025] Figure 3 This is a flowchart illustrating the adaptive correction method for planar fabrics, applicable to the present invention, specifically for wide fabrics.

[0026] Figure 4 This is a schematic diagram of the initial state of the large and small corrective wheels of the present invention.

[0027] In the diagram: 1. Overlock sewing machine, 2. Near-end correction sensor, 3. Small fabric guard plate, 4. Small correction wheel, 5. Sewing table, 51. Small sewing table, 6. Large fabric guard plate, 7. Far-end correction sensor, 8. Far-end positioning sensor, 9. Large correction wheel, 10. Fabric piece, 11. Fabric piece moving mechanism, 12. Wheel groove, 13. Small correction wheel lifting cylinder, 14. Large correction wheel lifting cylinder. Detailed Implementation

[0028] The specific implementation of the technical solution of the present invention will be further described below through examples and in conjunction with the accompanying drawings.

[0029] Example 1

[0030] In such Figure 1 In Embodiment 1 shown, an adaptive correction method for flat fabric pieces is described using an overlock sewing machine for edge stitching. The structure includes a control unit, a sewing table 5, and an overlock sewing machine 1 located behind the sewing table. The fabric piece 10 moves along the X-axis, and the sewing table 5 moves along the Y-axis. A fabric piece moving mechanism 11 is located on the front side of the sewing table 5. This mechanism is a synchronous belt positioned opposite the overlock sewing machine, with its length parallel to the X-axis and an outer surface coated with a rubber layer. A small correction wheel 4 and a near-end correction sensor 2 are located on the sewing table near the right side of the presser foot. In this embodiment, a small baffle plate 3 is located on the sewing table to the right of the presser foot. The small baffle plate 3 has a groove 12, and the small correction wheel 4 is located within this groove. The near-end correction sensor 2 is located on the small baffle plate 3, behind the left end of the groove 12. Both the small baffle plate 3 and the large baffle plate 6 include a rear baffle for limiting the backward movement of the fabric piece 10 and an upper baffle for limiting the upward tilting of the fabric piece. The front side of the upper baffle plate has a guide edge to facilitate the entry of the fabric piece. The rear baffle plate and the upper baffle plate work together to limit the rear edge (sewing edge) of the fabric piece and prevent the fabric piece from deviating too far back. The guide edge can reduce the probability of fabric jamming in the overlock sewing machine and improve the stability of the machine.

[0031] A large correction wheel 9 and a remote correction sensor 7 are provided on the sewing table to the right of the small correction wheel 4. A remote positioning sensor 8 is provided on the sewing table in front of the remote correction sensor 7. A large baffle plate 6 is provided on the right side of the small baffle plate 3. The large correction wheel 9 is located on the front side of the middle of the large baffle plate 6. A sensor hole is provided on the sewing table to the right of the large baffle plate 6. The remote correction sensor 7 is located in the sensor hole.

[0032] Both the small correcting wheel 4 and the large correcting wheel 9 are lifting wheels. In the initial state, the small correcting wheel 4 and the large correcting wheel 9 are in the raised state, and the left rim of the small correcting wheel 4 and the large correcting wheel 9 are deflected toward the rear side of the sewing table. In this embodiment, both the large correcting wheel 9 and the small correcting wheel 4 are rubber wheels. Using rubber wheels can increase the friction with the fabric. In the initial state, it is preferable that the radial plane of the large correcting wheel 9 and the X-axis make an angle of 10 degrees, and the radial plane of the small correcting wheel 4 and the X-axis make an angle of 35 degrees. When the fabric piece 10 shifts forward, the large correcting wheel 9 and the small correcting wheel 4 descend and contact the fabric 10. The movement of the fabric piece 10 causes the large correcting wheel 9 and the small correcting wheel 4 to roll on the fabric piece 10. Since the left rim of the large correcting wheel 9 and the small correcting wheel 4 deflects towards the rear of the sewing table 5, that is, there is an angle between the radial plane of the large correcting wheel 9 and the small correcting wheel 4 and the normal moving direction of the fabric piece 10, the large correcting wheel 9 and the small correcting wheel 4 can cause the fabric piece 10 to shift backward when they roll, thereby achieving correction. In this embodiment, the small correcting wheel 4 is mounted on the small correcting wheel lifting cylinder 13, which is fixed on the small sewing table 51 in the middle of the sewing table 5. The large correcting wheel 9 is mounted on the large correcting wheel lifting cylinder 14, which is fixed on the sewing table 5.

[0033] In actual production, the fabric piece 10 will undergo some changes in state during the sewing process (for example, the fabric piece will experience changes in stress due to the sewing thread, the fabric piece itself will be uneven in material, and there will be frictional contact with some mechanisms during the movement, etc., causing it to shift in position at the original speed. This invention can keep the fabric piece at a reasonable opposite edge position by changing the speed of the fabric piece moving mechanism in real time.

[0034] Figure 3 This is a flowchart of the correction method of the present invention. After the fabric piece 10 is placed on the sewing table 5, the control unit of the overlock sewing machine 1 provides a preset speed parameter. During the overlock sewing process, the near-end correction sensor 2, the far-end correction sensor 7 and the far-end positioning sensor 8 detect in real time whether the fabric piece 10 has shifted.

[0035] In this embodiment, the near-end correction sensor 2 and the far-end correction sensor 7 are on the same straight line along the X-axis, and the far-end positioning sensor 8 and the far-end correction sensor 7 are on the same straight line along the Y-axis. The adaptive correction method applicable to planar fabric pieces includes the following steps:

[0036] S1. When the remote correction sensor 7 detects that the fabric piece 10 is completely covered, it determines that the fabric piece 10 has a negative Y-axis offset. The small correction wheel 4 and the large correction wheel 9 are in the raised state. At the same time, the control unit increases the X-axis moving speed of the fabric piece moving mechanism 11, so that the X-axis moving speed V2 of the front side of the fabric piece 10 is greater than the X-axis moving speed V1 of the rear side of the fabric piece 10.

[0037] When fabric piece 10 shifts negatively along the Y-axis (which poses a risk of over-wrapping for fabric hemming), correction begins. First, the small correction wheel 4 and the large correction wheel 9 are raised (in the initial state). Then, the X-axis movement speed of the fabric piece moving mechanism 11 is linearly increased, causing a speed mismatch between the two sides of the fabric piece 10 along the X-axis. At this time, the speed V2 on the outer side of the X-axis (front of the sewing table) is higher than the speed V1 on the inner side of the X-axis (back of the sewing table). Since the proximal end of fabric piece 10 is fixed by the presser foot of the overlock sewing machine 1 at the sewing point, the speed V2 being higher than V1 will cause fabric piece 10 to rotate inward (the proximal end of fabric piece 10 moves negatively along the Y-axis, and the distal end of the fabric piece moves positively along the Y-axis) (see...). Figure 2 This effect causes the far end of the fabric piece 10 to move in the positive direction of the Y-axis. The longer the inner correction time sensed by the far end correction sensor 7, the greater the increase in V2 speed on the front side of the X-axis, the greater the speed difference between the two sides of the X-axis, and the greater the force of offset correction. Finally, the offset of the fabric piece 10 is corrected.

[0038] S2. When the remote correction sensor 7 does not detect that the fabric piece 10 is covered and the remote positioning sensor 8 detects that the fabric piece 10 is covered, it is determined that the fabric piece 10 has a positive Y-axis offset. The small correction wheel 4 and the large correction wheel 9 descend and roll into contact with the fabric piece 10. At the same time, the control unit slows down the X-axis moving speed of the fabric piece moving mechanism 11 so that the X-axis moving speed V2 of the front side of the fabric piece 10 is less than the X-axis moving speed V1 of the rear side of the fabric piece 10.

[0039] When fabric piece 10 shifts in the positive Y-axis direction (which poses a risk of missing stitches for fabric edging), the small corrective wheel 4 and the large corrective wheel 9 are pressed down first. Because the left rims of the small corrective wheel 4 and the large corrective wheel 9 deflect towards the rear of the sewing table 5, there is an angle between the radial plane of the small corrective wheel 4 and the large corrective wheel 9 and the normal direction of movement of fabric piece 10 (see...). Figure 4 Therefore, the rolling motion of the small correction wheel 4 and the large correction wheel 9 on the fabric piece 10 can move the fabric piece 10 to the rear, thus correcting the deviation. Then, by slowing down the X-axis movement speed of the fabric piece moving mechanism 11, the speed of the fabric piece 10 on both sides of the X-axis is mismatched, and the speed change is opposite to the negative Y-axis offset of the fabric piece 10 (i.e., V1 is higher than V2), which causes the fabric piece 10 to rotate outward, and finally completes the correction of the positive Y-axis offset of the fabric piece 10.

[0040] S3. When the remote correction sensor 7 detects that the fabric piece 10 is partially covered, it determines that the position of the fabric piece 10 is accurate, and the X-axis moving speed of the fabric piece moving mechanism 11 remains unchanged. This invention addresses three situations regarding the position of the fabric edge relative to the correction sensor: the correction sensor is completely covered by the fabric piece, partially covered, or not covered. When the correction sensor is partially covered by the fabric piece, the fabric piece position is determined to be normal, and no correction is needed. The specific judgment criteria for each of the three situations can be determined based on the actual conditions of the sensor and the fabric piece.

[0041] S4. Neither the remote correction sensor 7 nor the remote positioning sensor 8 detected that the fabric piece 10 was covered. When the near correction sensor 2 detected that the fabric piece 10 was completely covered, it determined that the fabric piece 10 was the end and generated a negative Y-axis offset. The small correction wheel 4 and the large correction wheel 9 were in the raised state. At the same time, the X-axis moving speed of the fabric piece moving mechanism 11 was increased, so that the X-axis moving speed V2 of the front side of the fabric piece 10 was greater than the X-axis moving speed V1 of the rear side of the fabric piece 10.

[0042] S5. When the remote correction sensor 7, the remote positioning sensor 8 and the near correction sensor 2 do not detect the fabric piece 10 covering, it is determined that the fabric piece 10 is the end and a positive Y-axis offset occurs. The small correction wheel 4 descends and rolls to contact the fabric piece 10. At the same time, the X-axis moving speed of the fabric piece moving mechanism 11 is slowed down, so that the X-axis moving speed V2 of the front side of the fabric piece 10 is less than the X-axis moving speed V1 of the rear side of the fabric piece 10.

[0043] S6. Neither the remote correction sensor 7 nor the remote positioning sensor 8 detected that the fabric piece 10 was covered. When the near-end correction sensor 2 detected that the fabric piece 10 was partially covered, it determined that the fabric piece 10 was the end and the position was accurate. The X-axis moving speed of the fabric piece moving mechanism 11 remained unchanged.

[0044] When the fabric piece 10 has been partially bound and sewn, and it is nearing the end of the fabric piece, the far end of the fabric piece 10 fails to cover the far-end correction sensor 7 and the far-end positioning sensor 8. When the binding and sewing of the fabric piece 10 fails to make the positioning sensor at the far end sense the fabric piece, the near-end correction sensor 2 and the small correction wheel 4 are used to correct the deviation. The way the fabric piece moving mechanism 11 and the near-end correction sensor 2 cooperate is the same as the way it cooperates with the far-end correction sensor 7. Considering that the fabric piece 10 has moved to a position close to the presser foot of the overlock sewing machine, the small correction wheel 4 is pressed down to improve the efficiency of the movement correction and achieve a better correction effect.

[0045] The above-mentioned correction method is applicable to fabric pieces whose width is greater than the distance between the presser foot of the overlock sewing machine and the fabric moving mechanism. By detecting multiple sensors and cooperating with the fabric moving mechanism, the sewing edge position of the fabric piece is corrected in real time, effectively offsetting the differences in the sewing edge position of different fabric pieces, automatically making adaptive adjustments to the deviation of the fabric piece, and improving the overlock sewing effect of the fabric piece.

[0046] The correction method in this embodiment corrects the fabric deviation indirectly (by changing the speed of the fabric along the X-axis) rather than directly along the Y-axis. This avoids the situation where the flexible fabric only accumulates at the correction stress point, failing to achieve proper correction. It reduces wrinkles and marks on the fabric, increasing its aesthetic appeal. Furthermore, this correction method addresses the impact of different fabric sizes on sewing edge alignment without requiring structural adjustments or parameter changes when fabric dimensions change. It also ensures edge alignment stability, making the equipment more versatile and reducing design costs.

[0047] Example 2

[0048] The structure of Example 2 is the same as that in Example 1. It is applicable when the width of the fabric piece 10 is less than the distance between the presser foot of the overlock sewing machine and the fabric piece moving mechanism 11, and the fabric piece moving mechanism 11 stops. At this time, the adaptive correction method applicable to the flat fabric piece includes the following steps:

[0049] S7. When the remote correction sensor 7 does not detect that the fabric piece 10 is covered and the remote positioning sensor 8 detects that the fabric piece 10 is covered, it is determined that the fabric piece 10 has a positive Y-axis offset, and the small correction wheel 4 and the large correction wheel 9 descend and roll into contact with the fabric piece 10.

[0050] S8. When the remote correction sensor 7 detects that the fabric piece 10 completely or partially covers the correction wheel 4 and the large correction wheel 9, the system does not perform correction operation.

[0051] S9. When the remote correction sensor 7, the remote positioning sensor 8 and the near correction sensor 2 do not detect the coverage of the fabric piece 10, it is determined that the fabric piece 10 is the end and a positive Y-axis offset is generated. The large correction wheel 9 is in the raised state, and the small correction wheel 4 descends and rolls into contact with the fabric piece 10.

[0052] S10. Neither the remote correction sensor 7 nor the remote positioning sensor 8 detects that the fabric piece 10 is covered. When the near-end correction sensor 2 detects that the fabric piece 10 is completely or partially covered, it determines that the fabric piece 10 is the end and the system does not perform correction operation.

[0053] The method of Example 2 is applicable to narrow fabric pieces, that is, to the situation where the fabric piece moving mechanism 11 on the front side of the sewing table cannot hold the fabric piece down. Usually, the position of the fabric piece moving mechanism 11 can be adjusted on the sewing table 5 to adapt to the correction of narrower fabric pieces. However, for the case where the fabric piece moving mechanism 11 still cannot hold the fabric piece down after adjusting its position, the present invention completes the correction of the fabric piece 10 by disabling the fabric piece moving mechanism 11 and using large and small correction wheels 9 and 4. When the fabric piece 10 deviates positively along the Y-axis, the small correcting wheel 4 and the large correcting wheel 9 descend, or the small correcting wheel 4 descends alone to roll into contact with the fabric piece 10. Since the left rim of the small correcting wheel 4 and the large correcting wheel 9 deflects towards the rear of the sewing table 5, that is, there is an angle between the radial plane of the small correcting wheel 4 and the large correcting wheel 9 and the normal moving direction of the fabric piece 10, the rolling action of the small correcting wheel 4 and the large correcting wheel 9 on the fabric piece 10 can move the fabric piece 10 to the rear, playing a corrective role, causing the fabric piece 10 to deviate negatively along the Y-axis, thus completing the correction. When the fabric piece 10 deviates negatively along the Y-axis, the baffle block structure on the small baffle plate 3 and the large baffle plate 10 prevents the fabric piece 10 from deviating excessively. Therefore, the correction method of the present invention is applicable not only to wide fabric pieces, but also to narrow fabric pieces with a very small width, thus ensuring that the present invention is adaptable to fabric pieces of various widths.

[0054] The correction method of the present invention is applicable to automated sewing equipment. It does not require the design of a special Y-axis correction mechanism. It only needs to control the fabric moving mechanism to complete the two tasks of auxiliary sewing movement and fabric edge alignment, thus avoiding the complex control task of Y-axis correction while sewing along the X-axis.

[0055] In addition to the embodiments described above, within the scope disclosed in the claims and specification of this invention, the technical features or technical data of this invention can be reselected and combined to form new embodiments. These can be achieved by those skilled in the art without creative effort. Therefore, these embodiments not described in detail in this invention should also be regarded as specific embodiments of this invention and within the protection scope of this invention.

Claims

1. A self-adaptive deviation correction method suitable for flat piece, comprising a control unit, a sewing table (5) and an overlock machine (1) arranged at the back side of the sewing table, characterized in that, The front side of the sewing table (5) is provided with a cloth moving mechanism (11), the sewing table near the right side of the overlock machine presser foot is provided with a small deviation wheel (4) and a near-end deviation sensor (2), the sewing table on the right side of the small deviation wheel (4) is provided with a large deviation wheel (9) and a far-end deviation sensor (7), the sewing table on the front side of the far-end deviation sensor (7) is provided with a far-end positioning sensor (8), the small deviation wheel (4) and the large deviation wheel (9) are both lifting wheels, in the initial state, the small deviation wheel (4) and the large deviation wheel (9) are in the raised state, the moving direction of the cloth (10) is the X-axis direction, the front direction of the sewing table (5) is the Y-axis direction, the near-end deviation sensor (2) and the far-end deviation sensor (7) are on the same straight line in the X-axis direction, the far-end positioning sensor (8) and the far-end deviation sensor (7) are on the same straight line in the Y-axis direction, and the adaptive deviation correction method suitable for the planar cloth includes the following steps: S1. When the far-end deviation sensor (7) detects that it is completely covered by the cloth (10), it is judged that the cloth (10) produces a Y-axis negative deviation, the small deviation wheel (4) and the large deviation wheel (9) are in the raised state, and at the same time, the control unit increases the X-axis moving speed of the cloth moving mechanism (11), so that the X-axis moving speed V2 of the front side of the cloth (10) is greater than the X-axis moving speed V1 of the rear side of the cloth (10); S2. When the far-end deviation sensor (7) does not detect that the cloth (10) is covered and the far-end positioning sensor (8) detects that it is covered by the cloth (10), it is judged that the cloth (10) produces a Y-axis positive deviation, the small deviation wheel (4) and the large deviation wheel (9) are lowered and in rolling contact with the cloth (10), and at the same time, the control unit slows down the X-axis moving speed of the cloth moving mechanism (11), so that the X-axis moving speed V2 of the front side of the cloth (10) is less than the X-axis moving speed V1 of the rear side of the cloth (10); S3. When the far-end deviation sensor (7) detects that it is partially covered by the cloth (10), it is judged that the position of the cloth (10) is accurate, and the X-axis moving speed of the cloth moving mechanism (11) remains unchanged.

2. The self-adaptive deviation correction method for planar fabric sheet according to claim 1, wherein The deviation correction method further includes the following steps: S4. When the far-end deviation sensor (7) and the far-end positioning sensor (8) both do not detect that the cloth (10) is covered and the near-end deviation sensor (2) detects that it is completely covered by the cloth (10), it is judged that the cloth (10) is the end and produces a Y-axis negative deviation, the small deviation wheel (4) and the large deviation wheel (9) are in the raised state, and at the same time, the X-axis moving speed of the cloth moving mechanism (11) is increased, so that the X-axis moving speed V2 of the front side of the cloth (10) is greater than the X-axis moving speed V1 of the rear side of the cloth (10); S5. When the far-end deviation correction sensor (7), the far-end positioning sensor (8) and the near-end deviation correction sensor (2) all do not detect the cloth (10) covering, it is judged that the cloth (10) is the end and generates Y-axis positive deviation, the small deviation correction wheel (4) is lowered and in rolling contact with the cloth (10), and the X-axis moving speed of the cloth moving mechanism (11) is slowed down, so that the X-axis moving speed V2 of the front side of the cloth (10) is less than the X-axis moving speed V1 of the rear side of the cloth (10); S6. When the far-end deviation correction sensor (7) and the far-end positioning sensor (8) all do not detect the cloth (10) covering and the near-end deviation correction sensor (2) detects being partially covered by the cloth (10), it is judged that the cloth (10) is the end and the position is accurate, and the X-axis moving speed of the cloth moving mechanism (11) remains unchanged.

3. The self adaptive deviation correction method for planar sheet applicable as claimed in claim 1, wherein, A small cloth blocking plate (3) is arranged on the right side of the presser foot of the overlock machine, a wheel groove (12) is arranged on the small cloth blocking plate (3), the small deviation correction wheel (4) is arranged in the wheel groove (12), the near-end deviation correction sensor (2) is arranged on the small cloth blocking plate (3), and the near-end deviation correction sensor (2) is located at the rear side of the left end of the wheel groove (12).

4. The self-adaptive deviation correction method for planar fabric sheet according to claim 3, wherein, A large cloth blocking plate (6) is arranged on the right side of the small cloth blocking plate (3), the large deviation correction wheel (9) is arranged at the front side of the middle part of the large cloth blocking plate (6), a sensor hole is arranged on the right side of the sewing table surface of the large cloth blocking plate (6), and the far-end deviation correction sensor (7) is arranged in the sensor hole.

5. The self adaptive deviation correction method for planar sheet applicable as claimed in claim 4, wherein, The small cloth blocking plate (3) and the large cloth blocking plate (6) all include a rear blocking edge for limiting the rear movement of the cloth (10) and an upper blocking edge for limiting the upward tilting of the cloth, and the front side of the upper blocking edge is provided with a guide edge facilitating the entry of the cloth.

6. The self adaptive deviation correction method for planar sheet applicable as claimed in claim 1, wherein, The large deviation correction wheel (9) and the small deviation correction wheel (4) are rubber wheels, the left side flanges of the small deviation correction wheel (4) and the large deviation correction wheel (9) are initially deflected to the rear side of the sewing table surface, the included angle between the radial plane of the large deviation correction wheel (9) and the X-axis is 7-13 degrees, and the included angle between the radial plane of the small deviation correction wheel (4) and the X-axis is 32-38 degrees.

7. The self adaptive deviation correction method for planar sheet applicable as claimed in claim 1, wherein, The small deviation correction wheel (4) is arranged on the small deviation correction wheel lifting cylinder (13) through a connecting mechanism, the small deviation correction wheel lifting cylinder (13) is fixed on the small sewing table (51) in the middle part of the sewing table surface, the large deviation correction wheel (9) is arranged on the large deviation correction wheel lifting cylinder (14) through a connecting mechanism, and the large deviation correction wheel lifting cylinder (14) is fixed on the sewing table surface.

8. The self-adaptive deviation correction method for planar fabric sheet according to any one of claims 1-7, characterized in that, The cloth moving mechanism (11) is a synchronous belt arranged opposite to the overlock machine, the synchronous belt is parallel to the X-axis, and a rubber coating layer is arranged on the outer surface of the synchronous belt.

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