Roll Body Load Measurement for Recording Apparatus
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Solution Overview
Problem
Large roll bodies with significant flexural deformation cause shifts in the center of gravity, leading to improper conveyance and potential damage during rotation, as existing measurement methods are inadequate for accurately assessing load fluctuations in such large rolls, resulting in uneven feeding and risk of breakage.
Innovation Solution
Implementing a control system that measures load and drive speed during a single rotation of the roll body, divided into multiple portions, and adjusts motor control to prevent excessive hanging and flexural deformation, with optional modes for reduced measurement time or load fluctuation assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the roll body is made large to increase recording medium capacity, then the quantity of recording medium increases, but flexural deformation occurs causing the center of gravity to shift from the shaft center
Solution Approach 1:
The system performs preliminary measurement of the relationship between load and drive speed before actual recording operation. By measuring the load characteristics when the roll body rotates once and storing this data, the control part can later adjust motor drive conditions based on the actual load characteristics, compensating for the instability caused by flexural deformation and center of gravity shift.
2Measurement precision
If measurement is performed during single rotation of large roll body, then load fluctuation accuracy improves, but recording medium hangs down excessively in peripheral part
Solution Approach 1:
The control part uses the measured load characteristics as feedback to adjust motor drive conditions. By measuring the load when the roll body rotates once and using this information to control subsequent motor operation, the system achieves accurate load compensation without requiring the roll body to rotate once during actual recording, thus preventing excessive hanging of the recording medium.
3Quantity of substance
If the roll body weight increases to increase capacity, then more recording medium can be stored, but the load on the drive motor increases causing breakage risk
Solution Approach 1:
The system changes the drive parameters (drive speed and torque) based on the measured load characteristics. By measuring the relationship between load and drive speed when the roll body rotates once, the control part adjusts motor parameters during operation to maintain optimal load conditions, preventing excessive load even when the roll body weight increases for higher capacity.
4Loss of time
If the roll body is left stationary for a while after mounting, then setup time is reduced, but flexural deformation occurs shifting center of gravity
Solution Approach 1:
The system performs preliminary measurement of load characteristics after the roll body is mounted and left stationary. This measurement captures the actual load conditions including any flexural deformation that occurred during stationary periods. The control part then uses this measured data to adjust drive conditions, compensating for the center of gravity shift without requiring additional setup time.
Data Source
AI summary
A recording apparatus includes an ink discharge part, a first drive part that drives a rotation of a roll body in which the recording medium is wound, a second drive part that drives the conveyance part that conveys the recording medium, and a control part that controls operations of the first drive part and the second drive part. The control part drives the first drive part in a halted state of the second drive part and executes a measurement that measures a relationship between a load and a drive speed when conveying the recording medium and the control part executes the measurement for a single rotation of the roll body. The control part also provides a first measurement mode to execute the single rotation which is divided into plural number.