Sheet Feeding Device Residual Length Control
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Solution Overview
Problem
Conventional sheet supply apparatuses face challenges in maintaining a uniform residual length of the first roll when joining sheets via an adhesive on the second roll, leading to wasteful excessive residual lengths and variability in the sheet supply.
Innovation Solution
A sheet supply apparatus with a controller that calculates and monitors the residual length of the first roll, controlling the rotation of support shafts to synchronize the peripheral speed of the second roll with the sheet from the first roll, ensuring the adhesive is at the correct position for uniform joining, thereby achieving a predetermined target residual wound length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the instructive signal is output when the residual length reaches a predetermined length, then the joining operation can be performed, but the residual length becomes variable and excessive waste occurs
Solution Approach 1:
The system performs preliminary calculation of the residual length based on the relationship between the number of rotations and the sheet length. The control unit calculates the residual length in advance by multiplying the number of rotations of the first support shaft by the sheet length per rotation, enabling proactive control before the joining operation is triggered, thus avoiding excessive waste and achieving precise residual length control.
Solution Approach 2:
The control unit continuously monitors the number of rotations of the first support shaft and uses this feedback to calculate and update the residual length in real-time. This feedback mechanism allows the system to adjust the timing of the joining operation to achieve the target residual length, preventing both excessive waste and insufficient residual length.
2Manufacturing precision
If the adhesive position is not synchronized with the pressing position, then the joining mechanism cannot perform accurate joining, but synchronizing requires complex control
Solution Approach 1:
The system replaces complex mechanical synchronization mechanisms with a computational approach. The control unit calculates the timing and position of the adhesive based on the rotational speed and position of the second support shaft, using mathematical relationships rather than mechanical linkages or sensors to achieve precise synchronization between the adhesive position and pressing position.
Data Source
AI summary
A first shaft control section is configured to control rotation of a first support shaft supporting a first roll such that a sheet is unwound from the first roll at a predetermined running speed. A second shaft control section is configured to execute a first rotation control of regulating a rotational speed of a second support shaft supporting a second roll such that a peripheral speed of the second roll coincides with the predetermined running speed of the sheet of the first roll. The second shaft control section is configured to regulate the rotational speed of the second support shaft by acceleration or deceleration such that an adhesive on an outer peripheral surface of the second roll arrives at a pressing position when a target joining portion of the sheet of the first roll meets the pressing position.