Gated Hooks for Level Cut and Loop Pile Tufts
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Solution Overview
Problem
Existing tufting machines struggle to produce cut and loop pile tufts of consistent height, leading to variable tuft heights and yarn wastage due to the reliance on yarn tension and spring clips, which results in inefficient yarn usage and an uneven carpet surface.
Innovation Solution
The use of gated hooks on a tufting machine allows for the formation of cut and loop pile tufts at nearly equal heights by closing a gate instead of relying on yarn tension, enabling smoother operation and reducing yarn consumption by allowing tufting at lower pile heights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If yarn tension and spring clips are used to form cut and loop pile tufts, then loop pile tufts can be formed, but the tuft heights become variable and inconsistent
Solution Approach 1:
The patent replaces the mechanical yarn tension control system with a gate-controlled system. Instead of relying on variable yarn tension and spring clips to form loops, a gate structure selectively opens and closes to control yarn passage to the cutting blade, enabling precise and consistent tuft height formation through mechanical gating rather than elastic yarn tension.
Solution Approach 2:
The patent changes the control parameter from yarn tension (which is difficult to control precisely) to gate position and timing (which can be precisely controlled). By controlling when the gate opens and closes relative to the needle and cutting blade positions, the system achieves precise control over tuft height and consistency.
2Reliability
If higher pile heights are used to prevent tuft pulling, then tuft stability is improved, but yarn consumption increases significantly
Solution Approach 1:
The gate structure performs preliminary action by controlling yarn passage before the cutting blade acts. The gate ensures that yarn is delivered to the cutting zone at the precise moment and position needed, allowing lower pile heights to be used while maintaining tuft stability, thereby reducing yarn consumption by 15-25%.
Solution Approach 2:
The patent replaces the mechanical reliance on high pile height for tuft stability with a controlled yarn delivery system using the gate. This substitution allows precise control over where and how yarn is delivered to the backing, achieving stability at lower heights and reducing overall yarn consumption.
3Ease of manufacture
If spring clips are used to release loops from hooks, then loop formation is achieved, but operation smoothness deteriorates and yarn usage increases
Solution Approach 1:
The patent replaces the spring clip mechanical system with a gate-controlled yarn delivery system. Instead of using elastic spring clips to release loops from hooks, the gate selectively opens to allow yarn passage directly to the cutting blade, eliminating the need for spring clips and improving operational smoothness while reducing yarn usage.
Solution Approach 2:
The patent extracts and removes the spring clip component from the loop formation mechanism. By eliminating spring clips entirely and using the gate structure to control yarn delivery, the system achieves loop formation without the operational complications and yarn waste associated with spring clip mechanisms.
Data Source
AI summary
A tufting machine is provided with two transverse rows of needles, one row being associated with transverse row of loopers and the other second row of needles being associated with a transverse row of gated hooks. Novel and low pile height tufted fabrics can be created with this configuration.