Slitter Device Tension Control via Feedback
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Solution Overview
Problem
The existing slitter device fails to maintain the desired tension of sheet materials during the cutting process, leading to cutting defects and quality deterioration, particularly with prepreg sheets, due to variations in transport speed and resistance, which are not adequately accounted for in the control mechanisms.
Innovation Solution
A slitter device with a roll driving motor connected to the support roll, equipped with first and second tension detecting units to compare raw-cloth and divided material tensions, and a drive controller that adjusts the roll driving motor to maintain coincident tensions, ensuring appropriate cutting by the cutter device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the support roll is rotationally driven to synchronize peripheral speed with transport speed, then the sheet material is transported without wrinkles or scratches, but the tension of the sheet material cannot be maintained at the desired degree for proper cutting
Solution Approach 1:
A tension detector is installed to detect the actual tension of the sheet material in real-time. The detected tension value is fed back to the control unit, which adjusts the rotational speed of the support roll based on the tension feedback to maintain the desired tension level for proper cutting while preventing transport defects
Solution Approach 2:
The rotational speed of the support roll is made dynamically adjustable rather than fixed at synchronous speed. The control unit varies the rotational speed according to detected tension conditions, allowing the system to adapt between transport quality requirements and cutting quality requirements
2Productivity
If the transport speed is increased to improve productivity, then more sheet material can be processed, but the tension of the sheet material varies due to transport resistance, causing cutting defects
Solution Approach 1:
The tension detector continuously monitors sheet material tension during high-speed transport. When increased transport speed causes tension variations that would lead to cutting defects, the feedback signal triggers the control unit to adjust the support roll speed to compensate, maintaining optimal cutting tension despite high productivity demands
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
Provided is a slitter device including a cutter device (20) having a plurality of disk-shaped rotary blades (23) provided according to the number of divisions of a sheet material (SM), and having a support roll (21) to which the rotary blade (23) is pressed and around which the sheet material (SM) is wound, wherein a roll driving motor (MR) that is provided to rotationally drive the support roll (21) is controlled such that a tension of the sheet material is maintained to a desired degree and cutting of the sheet material by the cutting device is performed appropriately. The slitter device (1) includes a first tension detecting unit for obtaining a raw-cloth tension value which is a tension value of a sheet material fed out from a let-off mechanism (10); a second tension detecting unit for obtaining a divided material tension value which is the sum of the tension values of each of divided sheet materials; and a drive controller (47c) which controls an operating state of the roll driving motor such that the raw-cloth tension value and the divided material tension value coincide or substantially coincide with each other based on the comparison result of the raw-cloth tension value and the divided material tension value.