Sewing Device Retractable Seating Curved Workpiece Interference
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Solution Overview
Problem
Conventional sewing devices cannot effectively sew curved workpieces without damaging them or causing positional misalignment, as they lack a mechanism to avoid interference with the receiving jig, especially when performing chain stitching or lock stitching.
Innovation Solution
A sewing device with retractable seating portions and a guiding mechanism that moves along a curved path to avoid undercut portions of the workpiece, allowing the sewing mechanism to operate without damaging the workpiece and maintaining its shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a receiving jig is used to hold the workpiece-to-be-sewn in a conventional sewing device, then the workpiece can be supported and positioned, but the receiving jig interferes with curved workpieces causing damage or positional misalignment
Solution Approach 1:
The seating portions are made movable rather than fixed, allowing them to be retracted from the workpiece during sewing operations. This dynamic configuration enables the seating portions to clear undercut portions of curved workpieces, preventing damage and misalignment while maintaining positioning accuracy when needed.
Solution Approach 2:
The receiving jig is divided into multiple independent seating portions that can be individually retracted. This segmentation allows selective retraction of specific seating portions based on the workpiece geometry, enabling the system to handle both flat and curved workpieces effectively without compromising positioning accuracy.
2Ease of operation
If the receiving jig is forcibly disposed on a curved workpiece, then the workpiece can be held, but the workpiece is damaged by the receiving jig
Solution Approach 1:
The seating portions are configured to be retractable, allowing them to dynamically adjust their position relative to the workpiece. This enables the system to hold the workpiece when needed while clearing away to prevent damage during sewing operations on curved surfaces.
3Reliability
If the receiving jig is used for curved workpieces, then the workpiece can be supported, but positional misalignment of the seam occurs
Solution Approach 1:
The retractable seating portions allow the system to maintain workpiece support during positioning while clearing the sewing path during actual sewing operations. This dynamic adjustment prevents seam misalignment on curved workpieces by ensuring the sewing mechanism operates without interference from the seating portions.
4Productivity
If a fixed sewing device is used for curved workpieces, then the sewing mechanism can operate, but interference with the receiving jig prevents proper thread circulation
Solution Approach 1:
The seating portions are made retractable to clear the sewing path when needed, enabling thread circulation and sewing operations on curved workpieces without requiring complex interference avoidance mechanisms.
Solution Approach 2:
The retractable seating portions serve multiple functions: they provide support and positioning when extended, and they clear the sewing path when retracted. This multi-functionality enables the system to handle both flat and curved workpieces with various sewing patterns without requiring separate specialized devices.
Data Source
AI summary
Provided are: a sewing device provided with a sewing mechanism which performs sewing on a work to be sewn using a sewing-machine needle, while holding the work to be sewn in a state of being shaped in a predetermined shape on a plurality of seating portions arranged in a sewing direction; and a sewing method. When the seating portions are withdrawn from the work to be sewn so as to avoid interference between the sewing mechanism and the seating portions, a guiding mechanism enables movement in a first withdrawing direction for avoiding a first undercut portion of the work to be sewn, and movement in a second withdrawing direction for avoiding a second undercut portion of the work to be sewn.