Recording Apparatus Roller Conveyance Speed Control
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Solution Overview
Problem
Existing recording apparatuses face errors in conveyance speed due to variations in recording medium diameter, environment temperature, and friction, leading to inconsistencies in the number of lines recorded, which cannot be effectively adjusted.
Innovation Solution
A recording apparatus with a roller conveyance system that includes an acquisition unit for measuring conveyance amount, a recording timing generation unit for generating timing signals based on rotation, and a drive signal generation unit to adjust recording intervals, ensuring accurate line recording on the medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the driving roll is rotated at a predetermined speed by a motor, then the conveyance operation can be performed, but the actual conveyance speed of the recording medium may differ from the assumed speed due to factors like roller diameter variation, pressing force changes, and friction force variations
Solution Approach 1:
The patent employs a feedback mechanism where the actual conveyance speed is detected through sensors (such as encoders or tachometers) and this detected speed information is fed back to the control unit. The control unit then adjusts the motor drive signals accordingly to compensate for speed deviations caused by roller diameter variations, pressing force changes, and friction forces, ensuring the recording medium moves at the desired speed with high reliability.
Solution Approach 2:
The patent dynamically changes operational parameters based on detected conditions. When speed deviations are detected, the control unit adjusts motor parameters (such as pulse width modulation duty cycle or frequency) to compensate for the deviations. This parameter adjustment continues throughout the conveyance process to maintain accurate speed control despite varying roller characteristics and environmental conditions.
2Manufacturing precision
If the number of lines to be recorded is adjusted corresponding to the rotation amount of the driving roll, then recording accuracy can be maintained, but the existing systems cannot effectively control or adjust this parameter
Solution Approach 1:
The patent implements a dynamic adjustment system where the number of lines to be recorded is not fixed but can be changed in real-time based on detected conveyance speed and roller rotation characteristics. The control unit calculates the appropriate number of lines based on actual operational conditions and automatically adjusts recording parameters accordingly, providing both high precision and operational flexibility.
Solution Approach 2:
The system uses feedback from speed detection and roller position sensing to dynamically determine the number of lines to be recorded. The control unit continuously monitors actual conveyance conditions and adjusts the recording parameter (number of lines) based on this feedback, ensuring recording accuracy while allowing easy adjustment of operational parameters.
3Reliability
If eccentricity correction is implemented, then recording stability can be improved, but the complexity of the control system increases
Solution Approach 1:
The patent performs preliminary detection of roller eccentricity and speed variations using sensors before the actual recording process begins. The control unit pre-calculates correction values and adjusts operational parameters in advance to compensate for expected eccentricity effects, thereby improving recording stability without requiring complex real-time correction mechanisms during the recording process.
Solution Approach 2:
The system adjusts operational parameters (such as motor speed, recording head position, and timing signals) based on detected eccentricity conditions. By changing these parameters dynamically to compensate for roller eccentricity, the system achieves stable recording while managing control complexity through parameter-based correction rather than mechanical complexity.
Data Source
AI summary
A recording apparatus includes a recording head, a roller configured to convey a recording medium, an acquisition unit configured to acquire information about a conveyance amount for conveying the recording medium per a predetermined rotation amount of the roller, a recording timing generation unit configured to generate a plurality of timing signals for performing recording for one raster line according to a rotation of the roller during one rotation thereof, and a drive signal generation unit configured to generate a drive reference signal for performing the recording for the one raster line on the recording medium at a predetermined interval based on the conveyance amount information and the timing signal.