Sheet Feeding Device Registration Mark Alignment Control
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Solution Overview
Problem
Conventional sheet supply apparatuses require a long time to align registration marks on two rolls, leading to delays in sheet supply due to variable rotational positions of registration marks on the second roll.
Innovation Solution
A sheet supply apparatus with a controller that adjusts the rotation start time and acceleration of the second support shaft to align registration marks on the first and second rolls via an adhesive, ensuring the marks face each other quickly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the peripheral speed of the second roll is regulated based on calculated positional deviation, then the registration marks can be aligned, but the time required to join the sheets increases due to variable actual positions of registration marks
Solution Approach 1:
The system performs preliminary detection of the actual position of the registration mark on the second roll before the joining operation. By detecting the initial position offset and calculating the required speed adjustment in advance, the system can regulate the peripheral speed of the second roll to ensure accurate alignment without excessive delay, thus resolving the contradiction between alignment precision and joining time.
Solution Approach 2:
The system implements a feedback mechanism where the actual position of the registration mark on the second roll is continuously monitored and used to adjust the peripheral speed of the second roll. This closed-loop control ensures that the registration marks are aligned accurately while minimizing the time required for the speed regulation process, thereby resolving the technical contradiction.
2Reliability
If the actual position of registration mark on the second roll is not constant, then the positional deviation varies, but maintaining speed regulation accuracy becomes difficult
Solution Approach 1:
The system uses feedback from the detected actual position of the registration mark to continuously adjust the peripheral speed of the second roll. This feedback mechanism ensures reliable sheet joining despite variations in the initial position, while the control system is designed to manage the complexity efficiently through automated calculations and adjustments.
Solution Approach 2:
The system dynamically changes the peripheral speed parameter of the second roll based on the detected actual position of the registration mark. By adjusting this key parameter in response to position variations, the system maintains reliable sheet joining without requiring overly complex control mechanisms, thus resolving the contradiction between reliability and device complexity.
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 approach significantly reduces the time required to join the sheets, allowing for a more efficient sheet supply by synchronizing the rotation of the second roll with the running speed of the first roll.
Implementation Method 1
a joining mechanism which joins the respective sheets of the first roll and the second roll to each other by a pressing operation of pressing the sheet run from the first roll rotating in association with rotation of the first support shaft to an adhesive provided on an outer peripheral surface of the second roll
Data Source
AI summary
A first shaft control section controls a first support shaft so that a sheet is unwound from the first roll at a predetermined running speed. A second shaft control section executes an adjustive control of adjusting at least one of a rotation start time and a rotational acceleration of the second support shaft so that, when a first joining target mark on the sheet of the first roll moves to a first reference position, a second joining target mark on an outer peripheral surface of the second roll arrives at a second reference position in a rotational direction thereof, and a peripheral speed of the second roll coincides with the running speed of the sheet of the first roll.