Reciprocating Needle Plate for Variable Gauge Tufting
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Solution Overview
Problem
Conventional tufting machines face limitations in efficiently shifting the backing fabric relative to the needles, particularly in broadloom tufting, due to the location of needle plate fingers, which restricts the ability to create variable gauge and patterned fabrics effectively.
Innovation Solution
A backing shifter mechanism that allows for precise lateral shifting of the backing fabric by using a reciprocating needle plate with laser-cut needle fingers and a rocker arm assembly, enabling shifts of up to 2.5 inches, simulating finer gauge tufting machines and providing patterning advantages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional needle plate fingers are used to support backing fabric, then the backing fabric can be supported during tufting, but the ability to shift backing fabric laterally is restricted
Solution Approach 1:
The needle plate fingers are designed to be movable rather than fixed, allowing them to reciprocate laterally between a first position during tufting and a second position during backing fabric shifting. This dynamic repositioning enables the same structure to serve dual functions: supporting the fabric during needle penetration and clearing the path during lateral shifts, thereby improving ease of operation without permanently increasing device complexity.
Solution Approach 2:
The needle plate structure is segmented into movable fingers that can independently reciprocate laterally. This segmentation allows the fingers to move out of the way during backing fabric shifting operations while remaining in position to support the fabric during tufting, resolving the contradiction between supporting fabric stability and enabling lateral shifting capability.
2Manufacturing precision
If backing fabric is shifted laterally to create variable gauge and patterned fabrics, then aesthetic appearance and stitch density are improved, but yarn interference increases
Solution Approach 1:
The needle plate fingers reciprocate to a cleared position before the backing fabric is laterally shifted. This preliminary action of moving the fingers out of the way prevents yarn interference during the shifting operation, allowing the backing fabric to be repositioned accurately without yarn obstruction, thereby maintaining high stitch placement precision while eliminating the harmful interference effect.
Solution Approach 2:
The needle plate fingers perform periodic reciprocation between the first position (during tufting) and the second position (during shifting). This periodic motion ensures that fingers are clear of the yarn path when lateral shifting occurs, preventing yarn interference, while returning to the support position to maintain stitch placement precision in the subsequent tufting cycle.
3Length of moving object
If needle plate fingers remain stationary during shifting, then structural simplicity is maintained, but shifting distance is limited to less than 2.5 inches
Solution Approach 1:
The needle plate fingers are designed with lateral reciprocation capability, transforming from a static structure to a dynamic one. This allows the fingers to move with the backing fabric during large lateral shifts (up to 2.5 inches or more) while maintaining their support function, thereby increasing the achievable shift distance without prohibitively increasing mechanism complexity.
Data Source
AI summary
Backing fabric shifting relative to needles and gauge parts for seizing yarns is utilized in a tufting machine having needle plate fingers or backing support that reciprocates in synchronization with the cycles of the needles to support the backing during penetration of the backing fabric while allowing backing shifts between stitches.