Variable-diameter opposite-side sewing device and method for curved surface patch of flat knitting machine

By using a variable-diameter cylinder device that allows for the synchronous expansion and contraction of inner and outer cylinders, along with an electromagnetic pressing mechanism, controllable deformation, automatic edge alignment, and automatic demolding of the fan-shaped two-dimensional curved sheet are achieved. This solves the problems of low sewing efficiency, inconsistent quality, and low automation in existing technologies, and realizes a highly efficient and stable sewing process.

CN122279849APending Publication Date: 2026-06-26JIANGNAN UNIV
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Patent Information

Application Number
CN202610664616.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-14
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

In the existing technology, the stitching of fan-shaped two-dimensional curved surface sheets has problems such as low efficiency, inconsistent quality, inability to adapt to special shape deformation, difficulty in automatic edge alignment and demolding, and existing equipment cannot meet the needs of continuous production.

Method used

A variable-diameter cylinder device with synchronous expansion and contraction of inner and outer cylinders is adopted, combined with an electromagnetic pressing mechanism, to achieve controllable deformation, automatic edge alignment and automatic demolding of curved sheets. Automatic demolding of finished products is achieved by axial movement of the inner cylinder.

Benefits of technology

It enables continuous, automated, and high-quality edge-to-edge stitching of fan-shaped two-dimensional curved sheets, solving the problems of controllable deformation from two-dimensional to three-dimensional, automatic edge-to-edge stitching, and automatic demolding, thereby improving production efficiency and finished product quality.

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Abstract

The invention discloses a variable-diameter opposite-edge sewing device and method for curved surface patches of a flat knitting machine, and belongs to the technical field of textile machinery. The device comprises a curling mechanism and a sewing mechanism, the curling mechanism comprises a variable-diameter cylinder device and a pressing mechanism matched with the variable-diameter cylinder device. The variable-diameter cylinder device comprises an inner-layer cylinder and an outer-layer cylinder, and synchronous expansion or contraction of the inner-layer cylinder and the outer-layer cylinder is achieved through corresponding telescopic connecting rods and a center main shaft. The pressing and holding mechanism is controlled by an electromagnet, and accurate pressing and holding of the curved surface sheet are achieved by switching the magnetic pole direction. According to the device, by means of the curling mechanism and the sewing mechanism, expansion of the fan-shaped curved surface sheet from a two-dimensional structure to a three-dimensional structure is achieved in the rotating process, and meanwhile automatic edge alignment sewing of the curved surface sheet is achieved. The inner-layer cylinder can axially move relative to the outer-layer cylinder, so that the sewn curved surface sheet finished product can be automatically separated from the outer-layer cylinder. According to the device, grabbing, curling, expanding, aligning and demolding are synchronously achieved, and the device is suitable for variable-diameter opposite-edge sewing of curved surface patches.
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