Circular Stitcher Pin Lock Mechanism for Sewing Machine
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Solution Overview
Problem
Conventional circular stitchers for sewing machines face challenges in secure detachable attachment of pins, leading to rattling and displacement issues during circular stitching, making precise alignment difficult and resulting in undesired stitch patterns.
Innovation Solution
A circular stitcher design featuring a base attachable to the sewing machine, a pin support with a lock mechanism that secures the pin in place, and a needle that pierces the workpiece cloth from underneath, allowing easy attachment and detachment while preventing rattling, and enabling precise alignment through a mechanism that utilizes an engagement catch and elastic member for secure pin retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the clearance between the stopper hole of the stopper plate and the needle base plate is increased to facilitate attachment/detachment, then the ease of operation is improved, but the needle base plate becomes susceptible to rattling, leading to displacement in circular stitch patterns
Solution Approach 1:
The attachment structure is divided into separate components: a stopper plate with stopper holes, a needle base plate with insertion holes, and a dedicated lock mechanism. This segmentation allows each component to perform its specific function - the clearance between holes facilitates easy attachment/detachment while the lock mechanism separately provides secure locking to prevent rattling, thus resolving the contradiction between ease of operation and alignment precision.
Solution Approach 2:
A lock mechanism acts as an intermediary element between the stopper plate and needle base plate. This intermediary component mediates the connection by providing a positive locking action that secures the needle base plate to the stopper plate, eliminating the rattling problem that would otherwise result from the necessary clearance for easy attachment/detachment operations.
2Manufacturing precision
If the clearance between the stopper hole of the stopper plate and the needle base plate is reduced to eliminate rattling, then the alignment precision is improved, but attachment/detachment of the needle base plate becomes troublesome
Solution Approach 1:
The attachment structure is divided into separate components: a stopper plate with stopper holes, a needle base plate with insertion holes, and a dedicated lock mechanism. This segmentation allows each component to perform its specific function - the clearance between holes facilitates easy attachment/detachment while the lock mechanism separately provides secure locking to prevent rattling, thus resolving the contradiction between ease of operation and alignment precision.
Solution Approach 2:
A lock mechanism acts as an intermediary element between the stopper plate and needle base plate. This intermediary component mediates the connection by providing a positive locking action that secures the needle base plate to the stopper plate, eliminating the rattling problem that would otherwise result from the necessary clearance for easy attachment/detachment operations.
3Ease of operation
If a detachable attachment structure is implemented to allow pin removal, then the ease of operation is improved, but the pin becomes susceptible to rattling and displacement
Solution Approach 1:
The attachment structure is divided into separate components: a stopper plate with stopper holes, a needle base plate with insertion holes, and a dedicated lock mechanism. This segmentation allows each component to perform its specific function - the clearance between holes facilitates easy attachment/detachment while the lock mechanism separately provides secure locking to prevent rattling, thus resolving the contradiction between ease of operation and alignment precision.
Solution Approach 2:
A lock mechanism acts as an intermediary element between the stopper plate and needle base plate. This intermediary component mediates the connection by providing a positive locking action that secures the needle base plate to the stopper plate, eliminating the rattling problem that would otherwise result from the necessary clearance for easy attachment/detachment operations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures secure attachment and detachment of the pin, prevents rattling, and maintains precise alignment, resulting in consistent and accurate circular stitch patterns without displacement, enhancing user safety and operational ease.
Implementation Method 1
an elastic member that biases the engagement catch toward the engagement recess
Data Source
AI summary
A circular stitcher for a sewing machine having a bed and a needle plate, and a feed dog includes a base attachable to an upper surface of the bed or the needle plate; a pin support seized movably in a predetermined direction by the base and having an engagement subject; a pin having an engagement engagable with the engagement subject of the pin support and a needle that pierces a workpiece cloth from an underside of the workpiece cloth at a laterally spaced position from a needle drop point, the needle assuming a center of rotational cloth feed executed by the feed dog during circular stitching; and a lock mechanism provided in the pin support and releasably locking the engagement and the engagement subject together.