A method for improving stitch accuracy in a sewing apparatus

Abstract

The application discloses a method for improving sewing needle spacing accuracy of sewing equipment, which comprises a sewing machine body, a needle and a needle plate arranged on the sewing machine body, a feeding work station for conveying sewing materials is formed between the needle and the needle plate, the needle is driven by a main shaft to move up and down, and the needle spacing is adjusted by a needle spacing adjusting assembly, a detection module for detecting the planar displacement variation of the sewing materials in the feeding work station is arranged on the sewing machine body, a stepping motor is controlled by a main controller to compensate the needle spacing according to the moving distance of the sewing materials; the moving distance AL of the sewing materials within T time is detected in real time by the detection module during the sewing process, and the moving speed V of the sewing materials is converted, and then the needle spacing is controlled in real time by the moving speed V of the sewing materials, the needle spacing is increased when the speed is slowed down, and the needle spacing is decreased when the speed is increased, so that the accuracy of the sewing needle spacing is improved, the consistency of the sewing needle spacing is ensured, and the sewing quality is ensured.

Description

Technical Field

[0001] This invention relates to the field of sewing machine technology, and more specifically to a method for improving the stitch length accuracy of sewing equipment. Background Technology

[0002] Synchronous sewing machines use a presser foot and feed dog to feed material simultaneously, making them particularly suitable for sewing thick materials. They can effectively solve the wrinkling problem that may occur when sewing multiple layers. Stepper synchronous sewing machines control the stitch length in real time through a stepper motor, making stitch length control flexible and convenient.

[0003] Currently, existing synchronous sewing machines, when sewing with the same stitch length setting, suffer from uneven sewing movement speeds due to the different operating speeds of the main spindle motors, which in turn affects sewing quality. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a method for improving the stitch length accuracy of sewing equipment to solve the above-mentioned problems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for improving the stitch length accuracy of sewing equipment, comprising a sewing machine body, and a needle and a needle plate disposed on the sewing machine body, wherein a feeding station for conveying sewing material is formed between the needle and the needle plate, the needle is driven by a main shaft to move up and down, and the stitch length is adjusted by a stitch length adjustment component, and a detection module for detecting the change in planar displacement of sewing material within the feeding station is disposed on the sewing machine body, the main controller receives the detection module and controls a stepper motor to perform stitch length compensation based on the distance the sewing material moves.

[0006] Furthermore, the detection module is a contact displacement sensing module that comes into direct contact with the sewing fabric; Alternatively, the detection module may be an optical detection module with its detection end facing the sewn fabric.

[0007] Furthermore, the optical detection module includes an optical flow sensor and an MCU microcontroller. The MCU microcontroller continuously reads the fabric movement distance ΔL detected by the optical sensor at intervals T and calculates the fabric movement speed V.

[0008] Furthermore, a contact displacement sensing module or an optical detection module is fixed on the needle plate.

[0009] Furthermore, a contact-type displacement sensing module or an optical detection module is fixed above the feeding station of the sewing machine body.

[0010] Furthermore, the formula for converting fabric movement speed is: V = ΔL / T; T is the interval time, and ΔL is the distance the sewing material moves during that interval time.

[0011] Furthermore, V0 is the set fabric movement distance, L0 is the set stitch length, and K is the control coefficient; The needle pitch for step control is L = L0 + K*(V0 - V); If L>Lmax, then L=Lmax; If L <Lmin L=Lmin。

[0012] The beneficial technical effects of this invention are as follows: This invention uses a detection module to detect the distance ΔL of the sewing material moving within a time T during the sewing process in real time, and converts it into the sewing material moving speed V. Then, the stitch length is controlled in real time by the sewing material moving speed V. When the speed is slowed down, the stitch length increases, and when the speed is fastened, the stitch length decreases, thereby improving the accuracy of the sewing stitch length, so as to ensure the consistency of the sewing stitch length and ensure the quality of the sewing. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall situation in Embodiment 1 of the present invention.

[0014] Reference numerals: 1. Main controller; 2. Optical detection module; 3. Optical flow sensor; 4. MCU microcontroller; 5. Stepper motor. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Identical components are denoted by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, and the terms "bottom surface," "top surface," "inner," and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0016] Example 1, referring to Figure 1 As shown, a method for improving the stitch length accuracy of a sewing machine is provided, including a sewing machine body and a needle and needle plate disposed on the sewing machine body. A feeding station for conveying sewing material is formed between the needle and needle plate. The needle is driven by a spindle to move up and down, and its stitch length is adjusted by a stitch length adjustment component. A detection module for detecting the change in planar displacement of the sewing material in the feeding station is provided on the sewing machine body. The detection module is received by the main controller 1 and controls the stepper motor 5 to perform stitch length compensation according to the distance the sewing material moves.

[0017] This invention uses a detection module to detect the distance ΔL that the sewing material moves in real time within a time T during the sewing process, and converts it into a sewing material movement speed V. The stitch length is then controlled in real time by the sewing material movement speed V. When the speed is slower, the stitch length increases, and when the speed is faster, the stitch length decreases, thereby improving the accuracy of the sewing stitch length, ensuring the consistency of the sewing stitch length, and ensuring the quality of the sewing.

[0018] The detection module is a contact displacement sensing module that comes into direct contact with the sewing material. Alternatively, the detection module may be an optical detection module 2 with its detection end facing the sewn fabric; In this embodiment, the detection module used is an optical flow detection module 2 with the detection end facing the sewing fabric. The optical flow detection module 2 includes an optical flow sensor 3 and an MCU microcontroller 4. The MCU microcontroller 4 reads the detection information detected by the optical flow sensor 3 in real time via a high-speed serial port to obtain the moving distance ΔL of the sewing fabric within time T, and converts it into the sewing fabric moving speed V. Meanwhile, the MCU microcontroller 4 can be integrated with the main controller 1, or the two can be connected separately via communication.

[0019] It should be noted that the optical flow detection module 2 used in this embodiment has a built-in optical flow sensor, also known as an optical tracking sensor. This sensor measures position changes by optically acquiring continuous surface images and mathematically determining the direction and magnitude of movement. It integrates an image acquisition system, a digital signal processor, and a four-wire serial port. The image acquisition system acquires surface images through a lens and illumination system, and the digital signal processor processes these images to determine the direction and distance of movement, thereby calculating the relative movement distance of the fabric. The MCU microcontroller 4 can read the fabric movement distance ΔL from the four-wire serial port of this sensor. Since this optical flow sensor is existing technology, its composition and working principle will not be described in detail in this specification.

[0020] Furthermore, in order to facilitate the fixing of the contact displacement sensing module or optical detection module 2 onto the needle plate; of course, the contact displacement sensing module or optical detection module 2 is fixed above the feeding station of the sewing machine body.

[0021] To convert the distance ΔL that the fabric moves in time T into its speed V, the formula for calculating the fabric speed is as follows: V = ΔL / T; T is the interval time, and ΔL is the distance the sewing material moves during that interval time.

[0022] After the MCU microcontroller 4 transmits the converted continuous turning angle information to the main controller 1, the main controller 1 calculates the required stitch length compensation amount based on the continuous sewing material movement speed. The stitch length compensation amount is calculated as follows: V0 is the set sewing material movement distance, L0 is the set stitch length, and K is the control coefficient. The needle pitch for step control is L = L0 + K*(V0 - V); If L>Lmax, then L=Lmax; If L <Lmin L=Lmin。

[0023] Subsequently, the main controller 1 controls the displacement of the stepper motor 5 according to the calculated stitch pitch compensation amount, so as to achieve the purpose of compensating for the stitch pitch error.

[0024] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A method for improving the stitch length accuracy of a sewing machine, comprising a sewing machine body, and a needle and a needle plate disposed on the sewing machine body, wherein a feeding station for conveying sewing material is formed between the needle and the needle plate, the needle is driven to move up and down by a spindle, and the stitch length is adjusted by a stitch length adjustment component, characterized in that: The sewing machine body is equipped with a detection module for detecting the change in planar displacement of the sewing material in the feeding operation station. The main controller (1) receives the data and controls the stepper motor (5) to perform stitch compensation based on the distance the sewing material moves.

2. The method for improving the stitch length accuracy of sewing equipment according to claim 1, characterized in that: The detection module is a contact displacement sensing module that comes into direct contact with the sewing fabric. Alternatively, the detection module may be an optical detection module with the detection end facing the sewn fabric (2).

3. The method for improving the stitch length accuracy of sewing equipment according to claim 1, characterized in that: The optical detection module includes an optical flow sensor (3) and an MCU microcontroller (4). The MCU microcontroller (4) continuously reads the fabric movement distance ΔL detected by the optical sensor (3) at intervals T and calculates the fabric movement speed V.

4. A method for improving the stitch length accuracy of a sewing machine according to claim 2 or 3, characterized in that: The contact displacement sensing module or optical detection module (2) is fixed on the needle plate.

5. A method for improving the stitch length accuracy of a sewing machine according to claim 2 or 3, characterized in that: The contact displacement sensing module or optical detection module (2) is fixed above the feeding station of the sewing machine body.

6. A method for improving the stitch length accuracy of a sewing machine according to claim 1 or 3, characterized in that: The formula for calculating the fabric movement speed is: V = ΔL / T; T is the interval time, and ΔL is the distance the sewing material moves during that interval time.

7. The method for improving the stitch length accuracy of sewing equipment according to claim 1, characterized in that: V0 is the set fabric movement distance, L0 is the set stitch length, and K is the control coefficient; The needle pitch for step control is L = L0 + K*(V0 - V); If L>Lmax, then L=Lmax; If L <Lmin L=Lmin。

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