Sewing Machine Restriction Member for String Material Guidance
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Solution Overview
Problem
Conventional sewing machines face issues where a string-shaped material swung in a lateral direction can catch on the presser foot due to its limited size, especially when the up-and-down movement stroke of the presser foot is shortened.
Innovation Solution
The sewing machine incorporates a restriction member with a laterally elongated section that corresponds to the range of reciprocating movement of the guide member, ensuring that the string-shaped material is positioned beneath it and prevented from catching on nearby components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the up-and-down movement stroke of the presser foot is shortened, then sewing speed and productivity are improved, but the string-shaped material may catch on the presser foot due to insufficient coverage area
Solution Approach 1:
The presser foot is extended in the lateral direction (horizontal dimension) to form a laterally elongated section. This dimensional extension ensures that the presser foot covers the entire range of reciprocating movement of the guide member, preventing the string-shaped material from catching on the presser foot even when the up-and-down movement stroke is shortened for high-speed sewing.
2Adaptability or versatility
If the guide member is swung in the lateral direction for zigzag stitching, then sewing pattern flexibility is improved, but the string-shaped material may positionally deviate and interfere with the presser foot
Solution Approach 1:
The presser foot is extended in the lateral direction to match the range of reciprocating movement of the guide member. This lateral extension ensures that regardless of how much the guide member swings for zigzag stitching patterns, the string-shaped material remains covered by the presser foot and cannot interfere with it.
Solution Approach 2:
The presser foot is designed with a laterally elongated section that proactively covers the entire anticipated range of guide member movement before the sewing operation begins. This preliminary coverage prevents any potential interference between the string-shaped material and the presser foot during lateral swinging operations.
Data Source
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AI summary
The sewing machine is configured to prevent a string-shaped material, swung in a lateral direction via a guide member, from catching on a nearby component part (particularly, a presser foot) of the sewing machine. A guide member (29, 50) for guiding the string-shaped material (T) toward a sewing position reciprocates in a lateral direction to sew the string-shaped material (T) to a sewing workpiece through zigzag stitching. A restriction member (38, 60) is disposed close to the guide member (29, 50) and has a laterally elongated section (38c, 60c) having a length corresponding to a range of reciprocation of the guide member (29, 50). The string-shaped material extending from the guide member (29, 50) to the sewing position is positioned to be located beneath the laterally elongated section (38c, 60c) of the restriction member (38, 60). With the presence of the laterally elongated section (38c, 60c), when the guide member (29, 50) reciprocates, the string-shaped material being swung left and right by the guide member is reliably positioned (restricted) beneath the laterally elongated section. The restriction member (38, 60) may function as a presser foot too.