An optical tracking sensor bending seam detection system
By using optical tracking sensors on the sewing machine to detect the movement and flatness of the fabric, calculate the turning angle and compensate the needle distance, the problem of large differences in the needle distance between the existing sewing machines in the curved seam and the straight seam is solved, and the consistency between the needle distance is achieved before and after turning, and the quality and efficiency of the sewing products are improved.
Patent Information
- Application Number
- CN202410164023.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-05
- Publication Date
- 2025-04-01
AI Technical Summary
The existing sewing machines do not use bending joint detection devices, resulting in a large difference in the hourly gap between the curved joints and straight joints, and the needle distance between the stitches is too large and small, resulting in inconsistent sewing of the sewing products, poor sewing effect, and affecting quality.
The optical tracking sensor bending joint detection system is used to detect the movement and flatness of the fabric, calculate the turning angle and feed it back to the sewing machine controller to compensate for the needle distance bending joint.
The consistency between the needle pitch and the front and back turns is achieved, the quality and efficiency of the sewing products are improved, and the inaccuracy of manual correction and time waste are avoided.
Smart Images
Figure CN119736764A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of sewing machines, in particular to a bent seam detection system of an optical tracking sensor applied to a sewing machine. Background Art
[0002] The existing sewing machine does not use a curved seam detection device, which leads to a particularly large difference in stitch length between curved and straight seams, and the stitch length between stitches will be large or small, resulting in inconsistent sewing of the sewn products, poor sewing effect, and affecting the sewing quality. At present, there are also ways to manually correct the mechanical angle to adjust the size of the stitch length, and there are also ways to manually adjust the sewing machine's electronic control parameters to compensate. No matter which method is used, there are the following defects:
[0003] 1. The compensation is not accurate. Manual correction compensation can only be performed by estimating the turning angle, and it is impossible to make the stitch length of the turning seam and the straight seam consistent;
[0004] 2. The efficiency is low. When turning is required, sewing must be stopped and then corrected manually, which wastes a lot of time. Summary of the invention
[0005] In view of the above-mentioned defects of the prior art, an object of the present invention is to provide an optical tracking sensor bending seam detection system.
[0006] The technical solution of the present invention is: an optical tracking sensor bent seam detection system, including an optical tracking sensor and a sewing machine controller. The optical tracking sensor is used to detect the movement of the cloth and the flatness of the cloth. When the optical tracking sensor detects that the cloth moves to the left a large extent and there are wrinkles or unevenness on the left side of the cloth, it can be judged according to the value of the left shift that the cloth is making a left turn for sewing. The turning angle is calculated by the difference in forward and backward moving speeds of the left and right sides of the cloth, and is fed back to the sewing machine controller to perform stitch length bent seam compensation.
[0007] Furthermore, when the optical tracking sensor detects that the fabric moves to the right a lot and there are wrinkles or unevenness on the right side of the fabric, it can be judged based on the right shift value that the fabric is making a right turn when sewing. The turning angle is calculated by the difference in forward and backward moving speed of the left and right sides of the fabric, and fed back to the sewing machine controller for stitch length bend compensation.
[0008] Furthermore, the optical tracking sensor has an X-axis detection module and a Y-axis detection module. The X-axis detection module detects left and right movement of the cloth, and the Y-axis detection module detects front and back movement of the cloth. There are two Y-axis detection modules and they are distributed on the left and right, one for detecting the front and back movement of the left side of the cloth, and the other for detecting the front and back movement of the right side of the cloth.
[0009] Furthermore, the optical tracking sensor has a Z-axis detection module, and the Z-axis detection module is used to detect whether the cloth is sewn in a left turn or a right turn.
[0010] Furthermore, there is a light emitting diode inside the optical tracking sensor, and the light it emits can illuminate the bottom surface of the fabric. Part of the light reflected back by the light surface passes through a group of optical lenses and is transmitted to a micro-hole imager for imaging. When the fabric is moved, its movement trajectory will be recorded as a group of coherent images taken at high speed. The digital microprocessor inside the optical tracking sensor is used to analyze and process a series of images taken on the movement trajectory. By analyzing the changes in the positions of feature points on these images, the X-axis and Y-axis coordinates are generated to determine the movement direction and distance of the fabric, so that the fabric can be accurately positioned.
[0011] The application of the optical tracking sensor bent seam detection system provided by the present invention has the beneficial effect that the present invention can detect the turning angle of the sewn fabric, and then feed it back to the sewing machine controller to perform stitch length bent seam compensation to achieve consistency of stitch length before and after turning. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a schematic diagram of the detection adjustment process of the present invention;
[0013] Figure 2 A circuit diagram of a sensor driving module of an optical tracking sensor of the present invention;
[0014] Figure 3 A circuit diagram of a voltage stabilizing module of an optical tracking sensor of the present invention;
[0015] Figure 4 A circuit diagram of the communication interface of the optical tracking sensor of the present invention. DETAILED DESCRIPTION
[0016] In order to more intuitively and completely understand the technical solution of the present invention, a non-limiting feature description is now provided in conjunction with the accompanying drawings of the present invention as follows:
[0017] like Figure 1 — Figure 4 As shown, an optical tracking sensor bent seam detection system includes an optical tracking sensor and a sewing machine controller. The optical tracking sensor is used to detect the movement of cloth and the flatness of cloth. When the optical tracking sensor detects that the cloth moves to the left a lot and there are wrinkles or unevenness on the left side of the cloth, it can be judged according to the left shift value that the cloth is making a left turn for sewing. The turning angle is calculated by the difference in forward and backward moving speeds of the left and right sides of the cloth, and the angle is fed back to the sewing machine controller to perform stitch length bent seam compensation.
[0018] When the optical tracking sensor detects that the fabric moves to the right a lot and there are wrinkles or unevenness on the right side of the fabric, it can be judged based on the right shift value that the fabric is turning right when sewing. The turning angle is calculated by the difference in speed between the left and right sides of the fabric and fed back to the sewing machine controller for stitch length bend compensation.
[0019] The optical tracking sensor has an X-axis detection module and a Y-axis detection module. The X-axis detection module detects the left and right movement of the cloth, and the Y-axis detection module detects the front and back movement of the cloth. There are two Y-axis detection modules and they are distributed on the left and right, one for detecting the front and back movement of the left side of the cloth, and the other for detecting the front and back movement of the right side of the cloth.
[0020] When sewing fabric, if you make a turn, it will inevitably cause wrinkles on one side of the fabric.
[0021] The optical tracking sensor has a Z-axis detection module, and the Z-axis detection module is used to detect whether the fabric is sewn in a left turn or a right turn.
[0022] There is a light emitting diode inside the optical tracking sensor. The light it emits can illuminate the bottom surface of the fabric. Part of the light reflected back by the light surface passes through a set of optical lenses and is transmitted to a micro-hole imager for imaging. When the fabric is moved, its movement trajectory will be recorded as a set of coherent images taken at high speed. The digital microprocessor inside the optical tracking sensor is used to analyze and process a series of images taken on the movement trajectory. By analyzing the changes in the positions of feature points on these images, the X-axis and Y-axis coordinates are generated to determine the movement direction and distance of the fabric, so that the fabric can be accurately positioned.
[0023] The optical tracking sensor includes a sensor driver module, a voltage regulator module, and a communication interface. Their circuit diagrams are shown in the following figure. Figure 2 — Figure 4 shown.
[0024] The invention can detect the turning angle of sewing fabric, and then feed back to the sewing machine controller to perform needle pitch bending compensation, so as to achieve the consistency of needle pitch before and after turning.
[0025] Of course, the above are only preferred embodiments of the present invention, and the patent scope of the present invention is not limited thereto. All simple modifications and equivalent structural changes made using the contents of the specification and drawings of the present invention should be included in the patent protection scope of the present invention.
Claims
1. An optical tracking sensor bending seam detection system, characterized in that: It includes an optical tracking sensor and a sewing machine controller. The optical tracking sensor is used to detect the movement and flatness of the fabric. When the optical tracking sensor detects that the fabric moves to the left a lot and there are wrinkles or unevenness on the left side of the fabric, it can be judged that the fabric is turning left when sewing according to the value of the left movement. The turning angle is calculated by the difference in the forward and backward moving speed of the left and right sides of the fabric, and the feedback is given to the sewing machine controller to compensate for the stitch length bend.
2. The optical tracking sensor bending seam detection system according to claim 1, characterized in that: When the optical tracking sensor detects that the fabric moves to the right a lot and there are wrinkles or unevenness on the right side of the fabric, it can be judged based on the right shift value that the fabric is turning right when sewing. The turning angle is calculated by the difference in speed between the left and right sides of the fabric and fed back to the sewing machine controller for stitch length bend compensation.
3. The optical tracking sensor bending seam detection system according to claim 1, characterized in that: The optical tracking sensor has an X-axis detection module and a Y-axis detection module. The X-axis detection module detects the left and right movement of the cloth, and the Y-axis detection module detects the front and back movement of the cloth. There are two Y-axis detection modules and they are distributed on the left and right, one for detecting the front and back movement of the left side of the cloth, and the other for detecting the front and back movement of the right side of the cloth.
4. The optical tracking sensor bending seam detection system according to claim 3, characterized in that: The optical tracking sensor has a Z-axis detection module, and the Z-axis detection module is used to detect whether the fabric is sewn in a left turn or a right turn.
5. The optical tracking sensor bending seam detection system according to claim 1, characterized in that: There is a light emitting diode inside the optical tracking sensor. The light it emits can illuminate the bottom surface of the fabric. Part of the light reflected back by the light surface passes through a set of optical lenses and is transmitted to a micro-hole imager for imaging. When the fabric is moved, its movement trajectory will be recorded as a set of coherent images taken at high speed. The digital microprocessor inside the optical tracking sensor is used to analyze and process a series of images taken on the movement trajectory. By analyzing the changes in the positions of feature points on these images, the X-axis and Y-axis coordinates are generated to determine the movement direction and distance of the fabric, so that the fabric can be accurately positioned.