Roll Sheet Conveying Apparatus Tension Control
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Solution Overview
Problem
Existing roll sheet conveying apparatuses require time-consuming and power-consuming identifying operations to maintain constant tension, which may not function effectively due to varying friction loads caused by the type, remaining amount, and use environment of the roll sheet.
Innovation Solution
A system comprising a sheet conveying apparatus with encoders to detect rotation amounts, an obtaining unit for friction load torque, a storing unit for friction load information, and a controlling unit that estimates moment of inertia to adjust motor driving and maintain constant tension without a special identifying operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a preliminary identifying operation is performed to measure load on the roll sheet, then appropriate tension can be applied according to conveying speed, but time and power are consumed for the identifying operation
Solution Approach 1:
The patent performs friction load torque measurements continuously during the actual conveying operation rather than requiring a separate preliminary identifying operation. The system measures torque at multiple timings during sheet conveying and uses these measurements to calculate moment of inertia in real-time, eliminating the need for dedicated calibration time while maintaining accurate tension control throughout the operation.
Solution Approach 2:
The system uses the normal conveying operation itself to gather the necessary measurement data. By measuring motor output current and rotation speed during actual sheet conveying, the system derives friction load torque and moment of inertia from the operational data, allowing the system to self-calibrate without external intervention or separate identifying operations.
2Reliability
If a preliminary identifying operation is performed to measure load on the roll sheet, then appropriate tension can be applied according to conveying speed, but power is consumed for the identifying operation
Solution Approach 1:
The patent performs friction load torque measurements continuously during the actual conveying operation rather than requiring a separate preliminary identifying operation. The system measures torque at multiple timings during sheet conveying and uses these measurements to calculate moment of inertia in real-time, eliminating the need for dedicated calibration time while maintaining accurate tension control throughout the operation.
Solution Approach 2:
The system uses the normal conveying operation itself to gather the necessary measurement data. By measuring motor output current and rotation speed during actual sheet conveying, the system derives friction load torque and moment of inertia from the operational data, allowing the system to self-calibrate without external intervention or separate identifying operations.
3Reliability
If drive control is based on data obtained by performing the identifying operation, then tension can be maintained according to conveying speed, but the control does not function normally when friction load varies due to sheet type, remaining amount, or use environment
Solution Approach 1:
The patent implements dynamic recalculation of moment of inertia during the conveying operation based on continuously measured friction load torque. Instead of using a fixed value obtained from preliminary identifying, the system updates the moment of inertia calculation as the roll sheet is consumed and conditions change, allowing the control to adapt to varying sheet types, remaining amounts, and environmental factors throughout the operation.
Solution Approach 2:
The system continuously measures motor output current and rotation speed during conveying, calculates friction load torque from these measurements, and uses this feedback to recalculate moment of inertia. This closed-loop feedback mechanism ensures the control parameters remain accurate despite changes in sheet conditions, roll remaining amount, or environmental variations.
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
Enables real-time control of motor driving to maintain constant sheet tension during roll sheet consumption, improving operational efficiency and reducing power consumption by eliminating the need for special identifying operations.
Implementation Method 1
a friction load on the rotation of the roll sheet may vary depending on the remaining amount, type, lot, or use environment of the roll sheet
Implementation Method 2
it is desirable to apply certain tension between the roll sheet and a conveying roller for conveying the roll sheet
Data Source
AI summary
A print apparatus has a supporting section for supporting a roll of a continuous sheet, a driving mechanism having a motor for rotating the roll supported by the supporting section, a detection unit configured to detect a rotation state of the roll supported by the supporting section, a conveyance roller for conveying the continuous sheet drawn out from the roll and a print unit configured to form an image on the continuous sheet conveyed by the conveyance roller. A control unit is configured to obtain information indicating a moment of inertia of the roll supported by the supporting section based on detected values of the detection unit and to adjust a driving torque of the motor based on the obtained information, intermittently during printing.