Loom Let-off Control for Tension Stability During Temple Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing loom technology experiences issues with fabric quality and warp insertion faults due to sudden changes in warp tension when the temple position is switched between operating and standby positions during the transition between weave sections of different densities, leading to unstable warp let-off control.
Innovation Solution
A warp let-off control method that adjusts the let-off motor speed by applying tension correction to the basic speed based on detected tension deviations, using an automatic temple position switching mechanism to cancel out tension changes during the displacement of the temple between operating and standby positions, employing different control modes to compensate for changes in warp tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the temple position is switched between operating and standby positions to adapt to different weave sections, then the fabric quality is improved by preventing crimping in high density sections, but the warp tension changes suddenly causing fabric quality reduction and warp insertion faults
Solution Approach 1:
The control device detects the temple position switching in advance and proactively adjusts the let-off motor speed before the temple actually moves. By predicting the upcoming tension change and compensating for it beforehand, the system prevents sudden tension fluctuations rather than reacting to them after they occur, thus maintaining warp tension stability during temple position transitions
Solution Approach 2:
The control device continuously monitors the temple position and let-off motor speed, using this feedback to dynamically adjust the let-off control. When temple position switching is detected, the system modifies the let-off motor speed based on the actual temple movement state, creating a closed-loop control that maintains stable warp tension despite temple position changes
2Reliability
If the let-off motor speed is adjusted to compensate for temple position changes, then the warp tension stability is improved, but the control complexity increases
Solution Approach 1:
The control device automatically detects temple position switching and independently adjusts the let-off motor speed without requiring external intervention or complex manual control. The system serves itself by using its own sensors and processors to monitor temple position and autonomously compensate for tension changes, reducing the need for additional complex control mechanisms
Solution Approach 2:
The control device adjusts the let-off motor speed parameter dynamically based on the temple position switching state. By changing the motor speed parameter in response to detected temple movement, the system simplifies the control approach to a single key parameter adjustment rather than requiring complex multi-parameter control systems
Data Source
Figure 1
Figure 2
Figure 3
AI summary
In a warp let-ff control method performed by a let-off device of a loom, the loom used for weaving a fabric (2a) having two or more weave sections with different densities, the loom including the let-off device that controls an amount of warp let-off by performing let-off control in which a let-off motor (5c) is driven in accordance with a detected tension and a target tension, and a temple device (40) including a temple (41) that is displaceable between an operating position and a standby position, the temple device automatically switching a position of the temple between the two positions in accordance with a weft density of one of the weave sections to be woven, the method includes controlling driving of a let-off motor with a control mode during a control period including a period during which the temple is displaced, the control mode adjusting an amount of warp let-off in a direction such that a change in a warp tension due to the displacement of the temple is cancelled out, the control mode being different from a control mode for performing let-off control in a normal operation of the loom after the control period.