Stepping roller machine inner and outer corner sewing stitch length automatic compensation structure

Abstract

The utility model discloses a stepping roller machine inner and outer corner sewing needle pitch automatic compensation structure which comprises a roller machine body, a machine needle, an upper feeding roller and a lower feeding roller, the machine needle, the upper feeding roller and the lower feeding roller are arranged on the roller machine body, and a feeding operation station used for conveying sewing materials is formed among the machine needle, the upper feeding roller and the lower feeding roller. The machine needle is driven by a main shaft to move up and down and is driven by a needle pitch adjusting assembly to achieve needle pitch adjustment, a detection module used for detecting the plane displacement variation of a sewing material in a feeding work station is arranged on the roller vehicle body, and the detection module is a contact type displacement sensing module in direct contact with the sewing material; or the detection module is an optical detection module of which the detection end faces the sewing material; the displacement variation of the sewing material in the X-Y coordinate direction is detected and obtained in real time in the sewing process through the detection module and converted into the continuous turning angle of the inner corner and the outer corner, and then the angle is used for compensating the stitch length error, so that the sewing stitch length is consistent, and the sewing quality is ensured.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, specifically to an automatic compensation structure for stitch length at the inner and outer corners of a stepping roller sewing machine. Background Technology

[0002] Roller sewing machines, used for sewing and embellishing leather, are primarily used for sewing high-end leather shoes, bags, straps, and curved belts. Stepper roller sewing machines, in particular, utilize stepper motors to drive the upper and lower rollers and needle for synchronous feeding, and can adjust the stitch length using a stitch length adjustment component.

[0003] Because the stitch length changes when sewing inside and outside corners on a stepping roller sewing machine—that is, the stitch length becomes smaller when sewing inside corners and larger when sewing outside corners—there is a problem of uneven stitches when sewing curved lines.

[0004] The current solution involves manual intervention to achieve stitch length compensation, using external buttons to achieve fixed stitch length compensation for internal and external corners. However, this method has the following problems: 1. It is inconvenient to operate manually, easy to press the wrong button, and once the wrong button is pressed, the sewing material will be ruined; 2. The amount of stitch length compensation is fixed each time, and continuous compensation cannot be achieved. As a result, the stitch length after compensation often still has deviation, affecting the quality of sewing. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this utility model is to provide an automatic compensation structure for the stitch length at the inner and outer corners of a stepping roller sewing machine, thereby solving the aforementioned problems.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an automatic compensation structure for stitch length at the inner and outer corners of a stepping roller sewing machine, comprising a roller body, a needle, an upper feed roller, and a lower feed roller mounted on the roller body, wherein a feeding station for conveying sewing material is formed between the needle, the upper feed roller, and the lower feed roller, the needle is driven by a spindle 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 the sewing material within the feeding station is provided on the roller body, the detection module being a contact displacement sensing module that is in direct contact with the sewing material;

[0007] Alternatively, the detection module may be an optical detection module with its detection end facing the sewn fabric.

[0008] Furthermore, the contact displacement sensing module or optical flow detection module is fixed on the lower roller bracket, which is a connector on the roller body used to connect the lower feeding roller; or the contact displacement sensing module or optical flow detection module is fixed on the lower base plate of the roller body.

[0009] Furthermore, the needle spacing adjustment component includes an upper roller stepper motor, a lower roller stepper motor, and a swaying needle stepper motor for adjusting the forward and backward amplitude of the needle bar. The upper roller stepper motor, the lower roller stepper motor, and the swaying needle stepper motor adjust the needle spacing of the needle bar.

[0010] Furthermore, the upper feeding roller is connected to the upper roller stepper motor, which drives the rotation of the upper feeding roller. The lower feeding roller is connected to the lower roller stepper motor, which drives the rotation of the lower feeding roller.

[0011] The beneficial technical effects of this utility model are: by using a detection module to detect and obtain the displacement change of the sewing material in the XY coordinate direction in real time during the sewing process, and converting it into the continuous turning angle of the inner and outer corners, the angle is then used to compensate for the stitch length error, so as to ensure the consistency of the sewing stitch length and ensure the quality of the sewing. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this utility model;

[0013] Figure 2 This is a schematic diagram of part A of the present invention;

[0014] Figure 3 This is a schematic diagram of the detection module structure of this utility model.

[0015] Reference numerals: 10, Roller body; 101, Needle; 102, Upper feed roller; 103, Lower feed roller; 104, Feeding station; 105, Lower roller bracket; 20, Needle pitch adjustment assembly; 201, Upper roller stepper motor; 202, Lower roller stepper motor; 203, Swing needle stepper motor; 30, Detection module; 301, Optical detection module. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Identical components are indicated 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.

[0017] Example 1, referring to Figure 1As shown, an automatic stitch length compensation structure for sewing at inner and outer corners of a stepping roller carriage is provided. It includes a roller carriage body, and a needle, an upper feed roller, and a lower feed roller mounted on the roller carriage body. A feeding station for conveying sewing material is formed between the needle, the upper feed roller, and the lower feed roller. The needle is driven up and down by a spindle, and its stitch length is adjusted by a stitch length adjustment component. A detection module is installed on the roller carriage body to detect the change in planar displacement of the sewing material within the feeding station. This invention uses the detection module to detect and acquire the change in displacement of the sewing material in the XY coordinate direction in real time during the sewing process, and converts it into continuous turning angles at inner and outer corners. These angles are then used to compensate for stitch length errors, ensuring consistent sewing stitch length and guaranteeing sewing quality. The detection module is a contact displacement sensing module that directly contacts the sewing material.

[0018] In this embodiment, the detection module is an optical detection module with the detection end facing the sewing material. In use, the optical sensing module detects the information of the sewing material to obtain the displacement change ΔX in the X coordinate direction and the displacement change ΔY in the Y coordinate direction. The displacement change ΔX and displacement change ΔY are then converted into the continuous turning angle of the inner and outer corners according to the set continuous turning angle conversion formula.

[0019] It should be noted that the optical detection module used in this embodiment is an optical sensor, also known as an optical tracking sensor. It measures position changes by acquiring continuous surface images optically 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 displacement values ​​of ΔX and ΔY. The MCU microcontroller can read the ΔX and ΔY information from the sensor's four-wire serial port. Since this optical flow sensor is existing technology, its composition and working principle will not be described in detail in this specification.

[0020] To facilitate the detection and acquisition of the displacement changes of the sewing material by the optical detection module, a contact displacement sensing module or an optical flow detection module is fixed on the lower roller bracket. The lower roller bracket is a connector used by the roller body to connect the lower feed roller, or the contact displacement sensing module or the optical flow detection module is fixed on the lower base plate of the roller body.

[0021] The needle spacing adjustment assembly includes an upper roller stepper motor, a lower roller stepper motor, and a swaying needle stepper motor that adjusts the forward and backward amplitude of the needle bar. The needle spacing of the needle bar is adjusted by the upper roller stepper motor, the lower roller stepper motor, and the swaying needle stepper motor.

[0022] The upper feeding roller is connected to the upper roller stepper motor, which drives the rotation of the upper feeding roller. The lower feeding roller is connected to the lower roller stepper motor, which drives the rotation of the lower feeding roller.

[0023] In this embodiment, the displacement change of the fabric in the XY coordinate direction is detected and obtained in real time during the sewing process by the detection module, and it is converted into the continuous turning angle of the inner and outer corners. The angle is then used to compensate for the stitch length error, so as to ensure the consistency of the sewing stitch length and ensure the quality of the sewing.

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

Claims

1. A kind of step-by-step roller car inside and outside corner sewing needle pitch automatic compensation structure, including roller car body, and be set on the needle of roller car body, upper feed roller and lower feed roller, needle, upper feed roller and lower feed roller between the feed work station for conveying sewing material are formed, needle is driven by main shaft to move up and down, and it is driven to realize pitch adjustment by pitch adjustment component, it is characterized by: The roller vehicle body is provided with a detection module for detecting the planar displacement variation of the sewing material in the feeding work station, and the detection module is a contact type displacement sensing module directly contacting the sewing material. Or the detection module is an optical detection module with a detection end facing the sewing material.

2. The automatic compensation structure for the corner stitch of the step roller in and out of the car according to claim 1, characterized in that: The contact type displacement sensing module or the optical flow detection module is fixed on a lower roller support, which is a connecting member of the roller vehicle body for connecting a lower feeding roller.

3. The automatic compensation structure for the corner stitch of the step roller in and out of the corner according to claim 1, characterized in that: The stitch spacing adjusting assembly includes an upper roller stepping motor, a lower roller stepping motor, and a needle swinging stepping motor for adjusting the front and back amplitudes of the needle rod, and the stitch spacing of the needle rod is adjusted by the upper roller stepping motor, the lower roller stepping motor, and the needle swinging stepping motor.

4. The automatic compensation structure for the corner stitch of the step roller according to claim 3, characterized in that: The upper feeding roller is in transmission connection with the upper roller stepping motor, and the rotation of the upper feeding roller is driven by the upper roller stepping motor, and the lower feeding roller is in transmission connection with the lower roller stepping motor, and the rotation of the lower feeding roller is driven by the lower roller stepping motor.

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