Sewing Machine Guide Elements Perpendicular Alignment
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Solution Overview
Problem
Existing sewing machines require manual alignment of material web edges, leading to mechanical loading and potential misalignment issues during the sewing process, especially when dealing with non-congruent material webs that need to form a three-dimensional shape.
Innovation Solution
The axes of rotation of the guide elements are arranged perpendicularly to the support surface, allowing for larger, more stable guide elements that provide a substantial contact area for better alignment and clamping of material webs, reducing mechanical loading and ensuring precise edge alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If guide wheels are mounted parallel to the support surface for alignment of material webs, then edge alignment capability is provided, but the contact surface is small causing punctiform clamping and excessive mechanical loading on the material webs
Solution Approach 1:
The guide elements are rotated 90 degrees around the axis parallel to the support surface, changing their orientation from parallel to perpendicular relative to the support surface. This dimensional reorientation allows the guide elements to extend substantially parallel to the support surface while maintaining vertical clamping capability, thereby enlarging the contact surface from punctiform to line-like contact and distributing mechanical loads more evenly across the material webs.
Solution Approach 2:
The orientation parameter of the guide elements is changed from parallel to perpendicular mounting relative to the support surface. This parameter change transforms the contact geometry from point contact to extended line contact, increasing the contact surface area and reducing mechanical stress concentration on the material webs while preserving alignment functionality.
2Ease of operation
If guide elements are configured with small contact area for minimal interference, then material web feed is simple, but clamping stability is insufficient causing material webs to shift during sewing
Solution Approach 1:
By reorienting the guide elements perpendicular to the support surface instead of parallel, the invention creates extended clamping surfaces that run substantially parallel to the support surface. This dimensional change provides sufficient clamping stability through increased contact area while maintaining simple material web feed operation, as the guide elements still allow free movement in the feed direction while preventing lateral displacement.
Data Source
AI summary
A sewing machine includes a contact area for two superimposed material webs, which have edges and which are to be sewn together by the sewing machine, wherein, in order to align the edges of the material webs to each other, there is a bottom guide element under the contact area for the bottom material web and a top guide element for the top material web above the contact area, wherein the guide elements are each rotatably mounted about a rotation axis. The rotation axes of the guide elements are arranged extending perpendicular to the contact area.