Recording Position Control Device Abnormality Detection via Timer Threshold
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Solution Overview
Problem
Conventional recording position correcting devices fail to accurately detect abnormalities in the moving operation of actuators, leading to printing misregistration due to erroneous position determination of head units, especially when unexpected vibrations or increased loads are applied, causing incomplete movement operations to be misinterpreted as completed.
Innovation Solution
A recording position control device that includes a controller, edge sensors, and a timer to detect meandering of the recording medium and correct the head units' positions, with an additional mechanism to measure the time period of the original-point determination operation, determining if the operation is normally executed by comparing the measured time period against a threshold, thereby preventing erroneous completion status transmissions from actuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the controller determines completion based only on completion status from actuators, then the operation is simple, but abnormality detection capability deteriorates
Solution Approach 1:
The controller implements feedback by measuring the actual time period of the original-point determination operation and comparing it with a predetermined threshold. This time-based feedback mechanism enables the system to detect abnormalities in actuator operation, such as when vibrations or increased loads cause incomplete movements to be misinterpreted as completed, thereby resolving the contradiction between operational simplicity and abnormality detection capability.
2Productivity
If the head units are arranged several meters apart, then the printing speed is improved, but color registration accuracy deteriorates due to meandering
Solution Approach 1:
Edge sensors detect meandering of the recording medium and provide feedback to the controller, which then generates correction amounts to adjust head unit positions. This feedback loop compensates for meandering effects, maintaining color registration accuracy despite the several-meter spacing between head units required for high-speed printing.
Solution Approach 2:
The system replaces mechanical rigid positioning with a control-based correction system. Instead of physically constraining head units to maintain precise positions, the system uses electronic control to measure meandering and dynamically correct positions, enabling both high speed and high precision.
3Speed
If the controller accepts completion status without time verification, then the processing speed is improved, but position determination accuracy deteriorates
Solution Approach 1:
The controller performs an additional time measurement action beyond simply accepting completion status. By measuring the time period and comparing it with a threshold, the system adds a verification step that ensures position determination accuracy without significantly impacting processing speed, as the time measurement occurs concurrently with the operation execution.
Data Source
AI summary
A recording position control device includes head units, edge sensors, head movers, a controller, and a timer. The controller performs an original-point determination operation of moving the head units to an original point and to control the head movers to move the head units in a direction to correct meandering of a recording medium. The controller performs a second round of the original-point determination operation after performing a first round of the original-point determination operation. The timer measures, as a measurement time period, a time period from when the controller issues an execution command of the second round to when the controller receives a completion status of the second round. In a case in which the measurement time period is equal to or shorter than a first threshold time period, the controller determines that the original-point determination operation of the head units has failed to be normally executed.