Tension Storage Mechanism for Stepped Digital Textile Printer Feed
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Solution Overview
Problem
Digital textile printers face challenges in maintaining stable fabric tension during stepped feeding, leading to fabric overfeeding, wrinkles, and uneven printing due to deceleration and stopping issues, which result in tension loss and bunching of slack fabric.
Innovation Solution
A tension storage mechanism is integrated into the feed mechanism of digital textile printers, which applies tension during forward motion and releases it to pull the fabric taut in a reverse direction after each feed step, ensuring consistent tension and preventing slack accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the fabric is fed through a roll that resists spin due to a slip-clutch or by transferring through two round static bars creating high friction, then tension is built when the fabric is in motion, but the system has no ability to contribute required tension between steps when no pulling action is carried out
Solution Approach 1:
The patent applies dynamics by making the tensioning system adaptive between different operational phases. The fabric feed system dynamically adjusts tension application: during motion, friction-based tensioning operates; between steps, the system transitions to a different mechanism (such as a cam-driven or spring-loaded tensioning device) that actively maintains tension without requiring fabric motion. This dynamic adaptation resolves the contradiction between building tension during motion and maintaining tension during static periods.
Solution Approach 2:
The patent introduces an intermediary tensioning mechanism that acts as a mediator between the friction-based feed rollers and the fabric. This intermediary device (such as a tensioning roller with adjustable pressure or a spring-loaded idler) continuously applies counter-pressure to the fabric, ensuring tension is maintained even when the primary feed mechanism is not actively pulling. This intermediary element bridges the gap between motion-based and static tension requirements.
2Stability of the object's composition
If the fabric is fed at higher tension to prevent bunching of slack at the sides, then the slack fabric is stretched and bunching is prevented, but the system requires continuous high tension which is difficult to maintain during deceleration and stopping in stepped feed
Solution Approach 1:
The patent applies periodic action by synchronizing the tensioning mechanism with the stepped feed cycle. During the acceleration and constant velocity phases of each feed step, the tensioning system applies higher tension to prevent bunching. During deceleration and stopping phases, the tensioning mechanism modulates or reduces tension application to match the fabric's inertial state. This periodic adjustment of tension timing resolves the contradiction between maintaining stable tension and preserving stepped feed productivity.
Solution Approach 2:
The patent implements feedback control where sensors detect fabric tension, position, and feed rate in real-time. This feedback information is used to dynamically adjust the tensioning mechanism's force application. When the system detects deceleration or stopping conditions, the feedback loop automatically reduces tension to prevent over-tensioning while still maintaining enough tension to prevent bunching. This closed-loop control resolves the contradiction by making tension stability dependent on actual operational conditions rather than constant high tension.
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
This solution maintains stable fabric tension throughout the printing process, preventing wrinkles and ensuring even, accurate printing by actively retrieving any overfeed and maintaining fabric tautness between steps.
Implementation Method 1
a tension store into the feed mechanism of a stepped feed digital printer, which is tightened by the feed and releases to cause a pullback
Data Source
AI summary
A textile feed for a stepped operation digital textile printer, comprises a textile feeding mechanism, and a tension storage mechanism. The textile feeding mechanism feeds the textile in a forward direction onto the printer, but is at the same time mechanically connected to a tension storage mechanism which is tensioned by the forward feeding. At the end of the feed step, the tension storage mechanism releases respectively stored tension to cause the feed mechanism to briefly reverse feed, thereby to pull the textile taut and take up any slack caused by the feeding step. The textile is thus kept taut, to allow effective digital printing by the printer.