Fly Edge Stitching Apparatus with Multi-Joint Conveyance
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Solution Overview
Problem
Existing edge stitching devices for flies, such as those found in trousers, face challenges due to the flexibility of the fly body, which causes deformation and inconsistent posture during stitching, leading to poor quality stitching. Additionally, the existing devices struggle to manage the positioning of the slide fastener tapes correctly, resulting in interference with the stitching process.
Innovation Solution
An edge stitching device that includes a clamping device with a holder and holder driving unit to stabilize the fly body, a multi-joint robot for continuous conveyance matching the shape of the fly body, and a tape separating device to ensure the non-sewn tape is positioned correctly above the sewing machine foot, preventing interference during stitching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the fly is conveyed using separate linear supply unit and rotation supply unit, then the fly can be supplied to the edge stitching unit, but the pressing position changes causing posture variation and poor stitching quality
Solution Approach 1:
The patent combines the linear supply unit and rotation supply unit into a single integrated conveying device that performs both linear movement and rotation simultaneously. This merging eliminates the pressing position changes that occur during transfer between separate units, maintaining constant posture of the fly throughout the conveying process and ensuring high stitching quality.
Solution Approach 2:
The conveying device is designed to perform multiple functions: it can convey the fly linearly, rotate it to appropriate orientations, and maintain constant pressing position throughout these operations. This multi-functionality replaces the need for separate specialized units while achieving better overall performance.
2Ease of manufacture
If both tapes of the slide fastener are stitched together with the fly body, then complete stitching is achieved, but the non-sewn tape interferes with the sewing machine foot
Solution Approach 1:
The patent extracts or separates the non-sewn tape from the stitching area by positioning it above the sewing machine foot while the fly body is being stitched. This extraction prevents the tape from interfering with the sewing machine foot while still maintaining the完整性 of the stitching process for the fly body.
Solution Approach 2:
The patent resolves the interference issue by changing the spatial dimension of the non-sewn tape positioning. Instead of having the tape lie flat in the same plane as the fly body under the sewing machine foot, the tape is positioned in a different dimension (above the foot), eliminating the harmful interference while maintaining stitching completeness.
Data Source
AI summary
An edge stitching device for a fly includes a table on which the fly is placed, a clamping device which sandwiches the fly in cooperation with the table, a sewing machine which edge-stitches an edge of a fly body, a cutter provided in the sewing machine and cut the fly body to form the curved side, and a clamping device conveying device which conveys the clamping device in a sandwiched state. The clamping device conveying device continuously performs: pre-edge-stitching conveyance, in which the clamping device is linearly conveyed toward the sewing machine in a state where the fly is sandwiched before edge stitching; and edge stitching conveyance, in which the clamping device is conveyed in a state where the fly is sandwiched during the edge stitching. In the edge stitching conveyance, the clamping device is conveyed in accordance with a shape of the curved side formed by the cutter.