Seat Heater Wire Sewing Synchronization
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Solution Overview
Problem
Conventional sewing technologies struggle to attach preformed heating wires with miniature waves and sharp turns to a substrate due to wire stiffness, needle deviation, slower sewing process, and potential deformation of metal strands, leading to reduced durability and stability of seat heaters.
Innovation Solution
A sewing machine with a wire-forming unit and wire-feeding conduit synchronizes the needle puncture pattern with the wire curvature, using sensors to regulate needle hits and sewing thread placement in gaps between wave shapes of the formed heating wire, ensuring secure attachment and maintaining the wire's shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sewing technology is used to attach straight heating wire, then the wire can be easily sewn onto the substrate, but the wire breaks when bent and has reduced durability
Solution Approach 1:
The heating wire is pre-formed into a corrugated shape with a minimum bending radius of 3mm before attachment to the substrate. This preliminary shaping allows the wire to accommodate bending stresses without breaking during subsequent sewing operations, thereby improving durability while maintaining ease of manufacture
Solution Approach 2:
The wire geometry is changed from straight to corrugated with specific parameters (minimum bending radius of 3mm, wave magnitude of 7mm, bending period of 8mm). This parameter change enables the wire to flex without breaking during sewing, resolving the contradiction between durability and manufacturability
2Reliability
If formed wire with sharp turns and miniature waves is used, then more wire length can be packed and temperature reduced, but conventional sewing cannot achieve the desired route replication
Solution Approach 1:
The wire is pre-formed into corrugated shapes with controlled geometry (3mm minimum radius, 7mm wave magnitude, 8mm bending period) before attachment. This preliminary formation ensures the wire maintains its desired route with sharp turns and miniature waves during sewing, achieving both high durability and manufacturing precision
Solution Approach 2:
The wire is given a corrugated curved shape with minimum bending radius of 3mm instead of being straight. This curvature allows the wire to pack more length into the heater (reducing temperature) while maintaining route precision during sewing, as the pre-formed curves resist deviation
3Manufacturing precision
If smaller sewing zig-zag pitch is used for sharper curves, then the wire route precision improves, but the sewing process slows down
Solution Approach 1:
The wire is pre-formed into corrugated shapes with controlled geometry before sewing. This preliminary action allows the use of larger zig-zag pitch during sewing while maintaining route precision, thereby resolving the contradiction between precision and sewing speed
4Productivity
If the wire is kept straight for easy sewing, then the sewing process is faster, but the wire breaks when bent and durability is reduced
Solution Approach 1:
The wire is pre-formed into corrugated shapes with minimum bending radius of 3mm before sewing. This preliminary shaping allows the wire to be sewn at normal speeds without breaking during bending, resolving the contradiction between sewing speed and durability
Solution Approach 2:
The wire geometry is changed from straight to corrugated with specific parameters. This parameter change enables the wire to accommodate bending stresses during high-speed sewing, maintaining both productivity and reliability
5Reliability
If formed wire is used to prevent crease damage, then the heater becomes more durable, but conventional attachment methods cannot securely attach the formed wire
Solution Approach 1:
The wire is pre-formed into corrugated shapes with controlled geometry before attachment. This preliminary formation, combined with synchronized needle puncture timing, enables secure attachment of the formed wire to the substrate, resolving the contradiction between durability and attachment feasibility
Solution Approach 2:
A sensor detects the position of the formed wire and provides feedback to synchronize the needle puncture timing. This feedback mechanism ensures accurate needle placement relative to the wire's wave pattern, enabling secure attachment of the pre-formed wire and resolving the manufacturing difficulty
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 results in a more durable seat heater with improved wire retention and reduced risk of wire slippage, enhancing the longevity and performance of the heating system.
Implementation Method 1
a formed resistance wire sewn onto a substrate
Data Source
AI summary
A seat heater includes a substrate. A formed heating wire is disposed on the substrate. A sewing thread attaches the formed heating wire to the substrate. A method of fabricating the seat heater includes forming a straight heating wire into a formed heating wire having miniature wave shape, feeding the formed heating wire onto a substrate, and attaching the formed heating wire onto the substrate by sewing a thread.