A laser cutting device for garment production

Abstract

The application relates to a laser cutting device for garment production and belongs to the technical field of garment processing, which comprises a cutting machine body, a sensing module and a control module, the control module is electrically connected with the cutting machine body and the sensing module respectively, the sensing module comprises a tension sensor, the tension sensor is electrically connected with the control module, the tension sensor is used for monitoring the tension force borne by current cloth and uploading the tension force to the control module, after the control module receives the tension data, whether the tension data exceeds a threshold value is judged, when the threshold value is exceeded, the moving speed of a laser cutting head of the cutting machine body is reduced according to the instruction.

Description

Technical Field

[0001] This invention belongs to the field of garment processing technology, and specifically relates to a laser cutting device for garment production. Background Technology

[0002] Clothing is a necessity of life. With the increasing demand for warmth and aesthetics, clothing is no longer limited to the traditional production method of directly making garments from textiles, but also includes production methods that print on fabric and then cut it. Modern garment production methods include fabric cutting, which involves driving a roll of fabric pre-printed with garment patterns through a laser cutting machine. The laser cuts the fabric into shapes similar to the main structure of the garment. These shaped fabrics are then sewn into finished garments. For example, Chinese Patent Publication CN107584220A discloses a laser cutting bed specifically for garment fabric production, including a base, a bed body, a power plug, and an information processor. The bed body is mounted on the base, the power plug is mounted on the bed body, the information processor is located on one side of the power plug, and a controller is located on one side of the information processor. A support frame is mounted on the bed body, a cross arm is mounted on the top of the support frame, a guide rail is mounted on the cross arm, a laser cutter is mounted on the guide rail, a length detector is located on one side of the laser cutter, a control panel is located on the front of the head of the cross arm, a display screen is mounted on the control panel, function keys are located below the display screen, a motor is mounted at the tail of the cross arm, and rollers are mounted on the bed body. Its advantages are: small equipment size, small space occupation, operators can obtain fabrics of different lengths by setting the length parameters of the fabric to be cut, wide applicability, and high degree of intelligence. However, conventional cutting methods only consider the cutting process. When the rolled fabric is unrolled and dragged through the laser cutting machine, the force on different parts of the fabric varies due to the dragging force. When a piece of fabric subjected to a large dragging force is cut, the tension resisting the dragging force disappears during the cutting process, which may cause the fabric to shift and affect the cutting accuracy. The above-mentioned methods do not have compensation measures for this. Therefore, a laser cutting device for garment production that takes into account tensile tension and has high cutting accuracy is needed. Summary of the Invention

[0003] To address the aforementioned problems in the existing technology, this invention provides a laser cutting device for garment production, which features high cutting precision while taking into account tensile tension.

[0004] The objective of this invention can be achieved through the following technical solutions: A laser cutting device for garment production includes a cutting machine body, a sensing module, and a control module. The control module is electrically connected to both the cutting machine body and the sensing module. The sensing module includes a tension sensor, which is electrically connected to the control module. The tension sensor monitors the tension force on the fabric and uploads the tension force to the control module. After receiving the tension data, the control module determines whether the tension data exceeds a threshold. If the threshold is exceeded, the control module instructs the laser cutting head of the cutting machine body to reduce its movement speed.

[0005] As a preferred embodiment of the present invention, the sensing module is used to monitor the tension Z of the current fabric and upload the tension data Z to the control module. The control module is used to adjust the moving speed of the laser cutting head to A1 times the original speed, where A1 = Z0 / Z × c, Z0 is the pre-inputted tension reference value, and c is the pre-inputted correction coefficient.

[0006] As a preferred technical solution of the present invention, the sensing module further includes a flatness monitoring module, which is used to monitor the flatness of the current fabric and upload it to the control module. The control module determines whether the flatness is higher than a threshold, and corrects the movement speed of the laser cutting head downward when it is higher than the threshold. As a preferred embodiment of the present invention, the sensing module is used to monitor the flatness P of the current fabric and upload the flatness data P to the control module. The control module is used to adjust the moving speed of the laser cutting head to A1×A2 times the original speed, where A2=P0 / P×d, P0 is the pre-input flatness reference value, and d is the pre-input correction coefficient.

[0007] As a preferred embodiment of the present invention, the sensing module further includes an online smoothness monitoring module, which is used to monitor the edge smoothness of the fabric that was previously cut and upload the smoothness to the control module. When the control module determines that the smoothness is below a threshold, it adjusts the movement speed of the laser cutting head downward.

[0008] As a preferred technical solution of the present invention, the sensing module is used to monitor the flatness M of the fabric cutting edge and upload the edge flatness M to the control module. The control module is used to adjust Z0 to A3 times the original value, where A3=M / M0×e, M0 is a pre-inputted edge flatness reference value, and e is a pre-inputted correction coefficient.

[0009] As a preferred embodiment of the present invention, it also includes a control panel, which is electrically connected to the control module. The control panel is used to input Z0, P0, M0 and c, d, e parameters, and to display the calculation results of A1, A2, A3 and the current laser cutting head movement speed in real time.

[0010] The beneficial effects of this invention are as follows: (1) By setting up a sensor module to monitor the current tension of the fabric, the operating speed of the laser cutting head is reduced when the tension is high, thereby reducing the risk of fabric micro-displacement caused by excessive changes in the tension distribution of the fabric due to excessive cutting speed. When the tension is low, the operating speed is appropriately increased to improve the overall production efficiency, thereby improving the cutting accuracy and fabric positioning stability. (2) By setting up a flatness monitoring module, the flatness of the fabric is monitored. When the flatness of the fabric is low, it is highly likely that the winding tension is too high, causing the fabric to wrinkle or local bulge. The tension adjustment mechanism is automatically triggered to reduce the winding tension and the laser cutting head is linked to pause the feed. The operation continues after the flatness is restored to the threshold range, thereby avoiding the cutting path deviation and edge burrs caused by uneven fabric surface, and further improving the cutting accuracy. (3) By introducing smoothness monitoring data, when the smoothness of the previous batch of cut fabric is low, the upper limit of the tension threshold is automatically reduced to ensure that the laser cutting head can be triggered to reduce the running speed at a lower tension, thus avoiding the aggravation of burrs on the cutting edge due to local loosening of the fabric or fluffy fibers. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a block diagram of the control loop of the present invention. Detailed Implementation

[0013] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0014] Please see Figure 1 A laser cutting device for garment production includes a cutting machine body, a sensing module and a control module. The control module is electrically connected to the cutting machine body and the sensing module respectively. The sensing module includes a tension sensor, which is electrically connected to the control module. In this embodiment, the cutting machine body is a common gantry laser cutting machine, which includes a laser cutting head, a servo motor system for driving the cutting head to move along the X / Y axis, and an unwinding mechanism and a winding mechanism for conveying the fabric. The fabric to be cut, which is usually pre-printed with the outline pattern of the garment, is installed on the unwinding mechanism. The front end of the fabric passes through the laser cutting head and is finally connected to the winding mechanism. During operation, the unwinding and rewinding mechanisms work together to pull the fabric section by section under the laser cutting head. When the area to be cut on the fabric moves directly under the cutting head, the conveying action stops, and the cutting head begins to cut according to the preset trajectory. After the cutting is completed, the fabric continues to move forward, sending the next section to be cut into the workstation. In actual production, during the unwinding and rewinding of rolled fabric, the tensile tension on the fabric is not constant due to factors such as the gradually decreasing fabric roll diameter and uneven fabric elasticity. When the tension on a certain area of ​​the fabric is too high, the fabric in that area is stretched and deformed. If the laser cutting head cuts at a normal speed at this time, once the fabric is cut, the tensile stress accumulated inside will be released instantly, causing the cut piece to spring back or shift. This results in a deviation between the actual cut piece outline and the design drawing, i.e., "shortage" or "distortion" problems, which seriously affect subsequent sewing processes. To this end, the sensing module includes a tension sensor, which monitors the tension force on the fabric and uploads the tension force to the control module. After receiving the tension data, the control module determines whether the tension data exceeds the threshold. When the threshold is exceeded, the control module instructs the laser cutting head of the cutting machine body to reduce its moving speed. Specifically, a floating or load-bearing roller is installed on one side of the laser cutting head in the feeding direction, contacting the bottom surface of the fabric. A strain gauge tension sensor is integrated on this roller shaft. The fabric remains pressed against the sensor throughout its movement, and the sensor monitors the instantaneous tension force on the fabric in real time. This tension force data Z is then uploaded to the control module at a fixed frequency. The control module adjusts the laser cutting head's movement speed to A1 times its original speed, where A1 = Z0 / Z × c, Z0 is the pre-inputted tension force reference value, and c is the pre-inputted correction coefficient. The control module has a preset tension reference value Z0. For example, for ordinary cotton fabric, Z0 can be set to 5 Newtons. At the same time, the operator can input a correction coefficient c in advance through the control panel. In this embodiment, the typical value range of c is 0.8-1.2. When the control module receives the real-time tension Z, it multiplies the current movement speed of the laser cutting head by a coefficient A1, where A1 = (Z0 / Z) × c; When Z > Z0, A1 < c, the cutting head speed is reduced to reduce the risk of micro-displacement of the fabric caused by excessive changes in the fabric tension distribution due to excessive cutting speed; when Z < Z0, A1 > c, the speed is moderately increased to improve processing efficiency while ensuring contour accuracy; this adjustment process is continuously executed in a single cutting action. By setting up a sensor module to monitor the current tension of the fabric, the operating speed of the laser cutting head is reduced when the tension is high to reduce the risk of micro-displacement of the fabric caused by excessive changes in the tension distribution of the fabric due to excessive cutting speed. When the tension is low, the operating speed is appropriately increased to improve the overall production efficiency, thereby improving the cutting accuracy and the stability of the fabric positioning. The above solution primarily addresses the cutting displacement problem caused by fluctuations in conveyor tension. However, in actual production, even if the tension is within the normal range, the fabric itself may exhibit unevenness such as localized wrinkles, bulges, or depressions due to uneven initial winding tension, moisture during storage, or material characteristics. When the laser cutting head passes through these uneven areas, the distance from the laser focus to the fabric surface changes, leading to incomplete cuts or scorched edges. Furthermore, the fabric at the wrinkled areas is prone to burrs after cutting, and these problems cannot be identified by tension sensors alone. To address this, a flatness monitoring module was introduced. This module monitors the flatness of the current fabric and uploads the data to the control module. The control module determines whether the flatness exceeds a threshold and adjusts the laser cutting head's movement speed downwards if it does. The sensing module is used to monitor the flatness P of the current fabric and upload the flatness data P to the control module. The control module is used to adjust the moving speed of the laser cutting head to A1×A2 times the original speed, where A2=P0 / P×d, P0 is the pre-input flatness reference value, and d is the pre-input correction coefficient. Specifically, the module is installed on one side of the feed direction of the laser cutting head. It can be a set of confocal laser displacement sensors or line laser profilometers. When the fabric is flattened and paused at the cutting station, the module quickly scans once along the width direction of the fabric, measures the distance from the fabric to the sensor, and generates a fabric surface height value. The control module calculates the flatness P of the current fabric based on the variance of several height values. The smaller the variance, the smaller the flatness P and the flatter the fabric. The larger the variance, the larger the flatness P and the less flat the fabric. Once the control module obtains the real-time flatness P, it will perform the following calculation: based on the original first-layer speed coefficient A1, it will multiply by a flatness correction coefficient A2, where A2 = (P0 / P) × d; When P is large, A2 < d, and the moving speed is further reduced to compensate for the decrease in cutting energy density caused by defocusing; when P approaches P0, A2 approaches d, and the moving speed returns to the baseline adjustment level. By setting up a flatness monitoring module, the flatness of the fabric is monitored. When the flatness of the fabric is low, it is highly likely that the winding tension is too high, causing wrinkles or local bulges in the fabric. The tension adjustment mechanism is automatically triggered to reduce the winding tension and the laser cutting head is linked to pause the feed. The operation will continue only after the flatness returns to the threshold range. This avoids cutting path deviation and edge burrs caused by uneven fabric surface, and further improves cutting accuracy.

[0015] In the above scheme, the device can adjust the cutting speed in real time according to the current tension and flatness of the fabric. However, these adjustments are based on preset reference values. If a batch of fabric has special material properties, such as high elasticity, loose fibers, or if the laser cutting head itself experiences performance degradation due to long-term use, then controlling according to the original Z0 and P0 may still result in burrs or jagged unevenness on the cut fabric edges. The system lacks a calibration closed-loop mechanism. To this end, the sensing module also includes an online smoothness monitoring module, which monitors the edge smoothness of the fabric in the previous cut and uploads the smoothness data to the control module. The control module adjusts the laser cutting head's movement speed downwards when the smoothness is below a threshold. Specifically, the sensing module is used to monitor the flatness M of the fabric cutting edge and upload the edge flatness M to the control module. The control module is used to adjust Z0 to A3 times the original value, where A3 = M / M0 × e, M0 is the pre-input edge flatness reference value, and e is the pre-input correction coefficient. The online smoothness monitoring module can use a high-resolution line scan camera with a ring light source, or a high-precision laser contour sensor. It measures parameters such as the serration depth and the number of burrs along the trajectory of the cutting edge, and calculates the edge smoothness M. The higher the M value, the smoother the edge. This M value is then uploaded to the control module. Assuming M0=80 and e=1, if the detected smoothness M=70, then A3=70 / 80×1=0.875. The control module will adjust Z0 to 0.875 times the original value. In subsequent cutting, the system will use a lower tension threshold to determine whether speed adjustment is needed, because a lower threshold will more easily trigger speed reduction protection, thus sacrificing a small amount of speed in exchange for a smoother cutting edge.

[0016] By introducing smoothness monitoring data, when the smoothness of the fabric cut in the previous batch is low, the upper limit of the tension threshold is automatically reduced to ensure that a lower tension can trigger the laser cutting head to reduce its running speed, thus avoiding the aggravation of burrs on the cutting edge caused by local looseness of the fabric or fluffy fibers.

[0017] To facilitate operation, a control panel is also provided. This panel is electrically connected to the control module and has the following functions: inputting the aforementioned reference values ​​Z0, P0, M0 and correction coefficients c, d, e; displaying the currently calculated values ​​of A1, A2, A3 and the actual moving speed of the laser cutting head in real time; and allowing operators to modify these preset values ​​based on experience parameters for different fabric materials.

[0018] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A laser cutting device for garment production, characterized in that: The device includes a cutting machine body, a sensing module, and a control module. The control module is electrically connected to both the cutting machine body and the sensing module. The sensing module includes a tension sensor, which is electrically connected to the control module. The tension sensor monitors the tension force on the fabric and uploads the tension force to the control module. After receiving the tension data, the control module determines whether the tension data exceeds a threshold. If the threshold is exceeded, the control module instructs the laser cutting head of the cutting machine body to reduce its movement speed.

2. The laser cutting device for garment production according to claim 1, characterized in that: The sensing module is used to monitor the tension Z of the current fabric and upload the tension data Z to the control module. The control module is used to adjust the moving speed of the laser cutting head to A1 times the original speed, where A1 = Z0 / Z × c, Z0 is the pre-inputted tension reference value, and c is the pre-inputted correction coefficient.

3. The laser cutting device for garment production according to claim 2, characterized in that: The sensing module also includes a flatness monitoring module, which monitors the flatness of the current fabric and uploads the data to the control module. The control module determines whether the flatness is higher than a threshold and adjusts the movement speed of the laser cutting head downwards if it is higher than the threshold.

4. The laser cutting device for garment production according to claim 3, characterized in that: The sensing module is used to monitor the flatness P of the current fabric and upload the flatness data P to the control module. The control module is used to adjust the moving speed of the laser cutting head to A1×A2 times the original speed, where A2=P0 / P×d, P0 is the pre-input flatness reference value, and d is the pre-input correction coefficient.

5. The laser cutting device for garment production according to claim 4, characterized in that: The sensing module also includes an online smoothness monitoring module, which monitors the edge smoothness of the fabric that was previously cut and uploads the smoothness to the control module. When the control module determines that the smoothness is below a threshold, it adjusts the movement speed of the laser cutting head downward.

6. The laser cutting device for garment production according to claim 5, characterized in that: The sensing module is used to monitor the flatness M of the fabric cutting edge and upload the edge flatness M to the control module. The control module is used to adjust Z0 to A3 times the original value, where A3 = M / M0 × e, M0 is the pre-input edge flatness reference value, and e is the pre-input correction coefficient.

7. The laser cutting device for garment production according to claim 6, characterized in that: It also includes a control panel, which is electrically connected to the control module. The control panel is used to input parameters Z0, P0, M0, c, d, and e, and to display the calculation results of A1, A2, and A3 and the current laser cutting head movement speed in real time.

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