Sewing Loop Positioning Device Guide Means Alignment
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Solution Overview
Problem
Existing positioning devices for sewing loops on garments fail to ensure precise and perfect alignment of strip ends with the central portion, leading to undesirable aesthetic effects due to protruding hems.
Innovation Solution
A positioning device with guide means, comprising perpendicular plates and rotating forks, that adjusts and aligns strip ends to perfectly overlap with the central portion during rotation, ensuring accurate positioning and alignment without protrusions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If rotating forks are used to rotate strip ends 180 degrees, then the ends are brought under the central portion of the strip, but the ends are not perfectly aligned with the central portion causing protruding hems
Solution Approach 1:
The patent introduces guide means as an intermediary element between the rotating forks and the strip ends. These guide means comprise guide elements that engage with the lateral edges of the strip and constrain the rotation path, ensuring the strip ends rotate precisely along an arc that brings them into perfect alignment with the central portion. This intermediary guiding mechanism eliminates the protruding hems problem by preventing misalignment during the rotation process.
Solution Approach 2:
The patent modifies the rotation parameter by introducing guide means that control the rotation path. The guide elements ensure that the strip ends rotate through a precise angular displacement with controlled lateral movement, changing the rotation parameter from a simple 180-degree rotation to a guided arc-shaped rotation that maintains perfect alignment throughout the motion, thereby eliminating protruding hems.
2Reliability
If blocking means are provided to hold the central portion fixed, then the strip can be positioned, but there is no mechanism to guide the ends during rotation for perfect superimposition
Solution Approach 1:
The guide means act as an intermediary between the blocking means and the rotating strip ends. While the blocking means hold the central portion fixed, the guide elements engage with the lateral edges of the strip ends during rotation, providing continuous guidance and constraint. This ensures that the ends follow the correct rotation path and achieve perfect superimposition on the central portion, enhancing both reliability and precision.
Solution Approach 2:
The positioning function is segmented into two independent but coordinated actions: the blocking means handle the central portion fixation, while the guide means handle the strip ends rotation guidance. This segmentation allows each component to perform its specific function optimally - the blocking means ensure stability of the central portion, while the guide means ensure precise rotation and alignment of the ends, together achieving reliable and precise positioning.
3Device complexity
If no guide means are provided for the ends during rotation, then the device construction is simpler, but the ends cannot be perfectly superimposed on the central portion
Solution Approach 1:
The guide means serve as a relatively simple intermediary structure that engages with the lateral edges of the strip. The guide elements can be straightforward mechanical components that guide the rotation without requiring complex mechanisms. This adds minimal complexity to the device construction while delivering the critical function of perfect alignment, making the precision gain worthwhile compared to the small increase in device complexity.
Data Source
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AI summary
The present invention refers to a positioning device and to a sewing machine comprising said device, to appropriately arrange and position a loop on a garment during processing.