Fly Sewing Machine Auxiliary Conveyance for Short Fly Stability
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Solution Overview
Problem
In fly sewing machines, short flies are unstable when transferred and tend not to be properly stitched to the slide fastener chain due to extrusion force and frictional forces, leading to inconsistent stitching.
Innovation Solution
A fly sewing machine configuration that includes a fly supply unit, a fly transfer unit, a chain feed unit, an auxiliary conveyance unit with rollers and needle sections, and a sewing machine part, which stabilizes the feeding of flies and slide fastener chains, allowing for proper stitching even with short flies by using an auxiliary conveyance unit with rollers and needle sections to press and align the flies and chains before stitching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the fly length is shorter than the distance between the transfer speed-adjusting part and the pressing member, then the sewing machine can handle smaller flies, but the flies become unstable during transfer due to extrusion force and frictional force
Solution Approach 1:
An auxiliary conveyance unit is introduced as an intermediary mechanism between the chain feed unit and the sewing machine part. This unit includes a conveyance roller that rotates to positively convey the fly and chain assembly, preventing instability caused by extrusion force and friction during transfer. The intermediary mechanism ensures reliable transport even when fly length is shorter than the distance between transfer points.
Solution Approach 2:
The auxiliary conveyance unit performs preliminary action by conveying the fly and chain together before they reach the sewing machine part. This preliminary conveyance ensures proper positioning and stability of the fly on the chain before stitching begins, preventing transfer instability that would occur with short flies in the traditional configuration.
2Adaptability or versatility
If the fly length is shorter than the distance between transfer points, then smaller flies can be processed, but the flies are not normally stitched to the slide fastener chain
Solution Approach 1:
The auxiliary conveyance unit acts as an intermediary that ensures precise positioning of the fly and chain assembly before it reaches the sewing machine part. The conveyance roller provides controlled transport that maintains manufacturing precision even when processing short flies that would otherwise be unstable during transfer.
Solution Approach 2:
The auxiliary conveyance unit performs preliminary positioning and stabilization of the fly and chain before they enter the sewing machine part. This preliminary action ensures that short flies are properly aligned and secured to the chain, enabling accurate stitching that would otherwise be impossible with the traditional configuration.
3Productivity
If the transfer speed-adjusting part sends flies at required timing, then the sewing process can be synchronized, but short flies are extruded downstream by the next fly
Solution Approach 1:
The auxiliary conveyance unit merges the conveyance of the fly and the chain into a single integrated action. The conveyance roller simultaneously transports both components together, preventing the extrusion of short flies by the next fly while maintaining synchronization with the sewing process. This merged conveyance approach preserves both productivity and position stability.
Solution Approach 2:
The auxiliary conveyance unit serves as an intermediary mechanism that buffers between the fly transfer unit and the sewing machine part. It provides controlled conveyance that prevents extrusion forces from disrupting fly position stability, while still allowing synchronized operation with the sewing process to maintain productivity.
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
Ensures stable feeding and proper attachment of flies to the slide fastener chain, enabling reliable stitching even when fly lengths are shorter than the distance between transfer points, improving the stability and consistency of the stitching process.
Implementation Method 1
frictional force with the slide fastener chain fed by the chain feed unit
Data Source
AI summary
There is provided a fly sewing machine. A fly supply unit is configured to supply flies to a transfer passage. A fly transfer unit is configured to transfer and send the fly supplied by the fly supply unit toward the downstream side thereof. A chain feed unit is configured to feed a slide fastener chain onto the flies sent by the fly transfer unit. An auxiliary conveyance unit is configured to press the flies and the slide fastener chain which are overlapped by the chain feed unit from above or below, and to send the flies and the slide fastener chain toward the downstream side thereof. A sewing machine part is configured to stitch together the flies and the slide fastener chain sent by the auxiliary conveyance unit.