Single Super Feed Cam Mechanism for Compact Sewing Machines
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional feed generating devices for sewing machines require a large arrangement space and increased operational force due to multiple super feed cams and a complex feed releasing mechanism, compromising size and operability when sewing multiple utility and super patterns.
Innovation Solution
A feed generating device with a single super feed cam and multiple feed contacts that can contact the cam at different phases, utilizing a switching mechanism to generate various combinations of forward and backward cloth feeds, reducing the need for additional space and operational complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple super feed cams are provided to enable sewing of multiple super patterns, then the versatility of the sewing machine is improved, but the arrangement space and device complexity increase
Solution Approach 1:
A single super feed cam is designed to perform multiple functions by providing multiple contact locations around its circumference. Different feed contacts can contact the cam at different locations to generate different super patterns, eliminating the need for multiple separate cams and reducing arrangement space.
Solution Approach 2:
The super feed cam is segmented into multiple contact locations, each corresponding to a different super pattern. The feed contact can be positioned at different segments of the cam to select different patterns, allowing one cam to replace multiple cams.
2Adaptability or versatility
If multiple super feed cams and a feed releasing mechanism are provided, then the versatility is improved, but the device complexity and operational force increase
Solution Approach 1:
The pattern selection function is merged into the existing pattern selection dial. The same dial that selects utility patterns also selects super patterns by rotating to different positions, eliminating the need for a separate feed releasing mechanism and reducing operational complexity.
Solution Approach 2:
The pattern selection dial is given universal functionality to control both utility patterns and super patterns. By rotating the dial to different positions, the user can select from multiple utility patterns or switch to super patterns without requiring additional control mechanisms.
3Adaptability or versatility
If the number of feed cams is increased to provide more pattern options, then the versatility is improved, but the operational force required increases
Solution Approach 1:
The pattern selection dial controls a single feed contact that can engage with either utility feed cams or the super feed cam depending on the dial position. This universal control mechanism reduces the number of separate switching mechanisms needed, thereby reducing the operational force required.
Data Source
AI summary
A feed generating device for a sewing machine capable of selectively sewing one of a plurality of utility patterns and a plurality of super patterns including a single super feed cam generating a cloth feed for sewing the super pattern, a single or a plurality of feed contacts capable of contacting the super feed cam and a switching mechanism that moves the feed contact to a plurality of contact locations having different swing phases with respect to the super feed cam. The cloth feed for sewing the super pattern is a combination of a forward feed and a backward feed and by moving the feed contact to either one of a plurality of contact locations by the switching mechanism, cloth feed including different patterns of combination of the forward feed and the backward feed are generated.