Drive Roller Torque Control for Recording Medium Tension
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Solution Overview
Problem
Existing image recording devices experience slipping and tension fluctuations in the recording medium due to velocity differences between drive rollers, leading to unstable transportation and positional inaccuracies in image recording.
Innovation Solution
An image recording device with a support member and a control unit that adjusts the torque of the first drive roller based on detected tension, maintaining stable medium tension by controlling the torque rather than relying on velocity differences between rollers, and incorporating a detection unit to monitor and adjust tension fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If velocity difference is provided between drive rollers to give tension to the recording medium, then the recording medium is transported, but slipping occurs between the drive roller and recording medium causing tension fluctuation
Solution Approach 1:
The patent applies feedback control by using a tension sensor to detect the actual tension of the recording medium and feeding this information back to the control unit. The control unit adjusts the drive roller's torque based on this feedback to maintain stable tension, preventing slipping and ensuring reliable transport without velocity differences between rollers.
Solution Approach 2:
The patent changes the control parameter from velocity difference to torque control. Instead of creating tension through velocity differences that cause slipping, the system controls tension by adjusting the torque of the drive roller, thereby maintaining stable transport conditions.
2Speed
If velocity difference is provided between drive rollers to give tension to the recording medium, then the recording medium is transported, but tension fluctuation occurs causing positional inaccuracy in image recording
Solution Approach 1:
The tension sensor provides continuous feedback on the recording medium tension to the control unit, which adjusts the drive roller torque accordingly. This feedback mechanism maintains constant tension throughout transport, ensuring high positional precision for image recording by eliminating tension-induced positioning errors.
Solution Approach 2:
The system transitions from velocity-based tension creation to torque-based tension control. By controlling the torque parameter of the drive roller based on tension sensor feedback, the system maintains stable tension and achieves precise positional control for image recording.
3Reliability
If torque control is used to give tension to the recording medium, then slipping is suppressed, but device complexity increases due to detection unit and control unit
Solution Approach 1:
The feedback control system uses a tension sensor to monitor actual tension and feeds this information to the control unit, which adjusts drive roller torque accordingly. This automated feedback mechanism stabilizes transport reliability while managing system complexity through intelligent control rather than mechanical 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 solution stabilizes the transportation of the recording medium, ensuring high positional precision and preventing damage from excessive tension fluctuations during image recording.
Implementation Method 1
a detection unit that detects the tension of the recording medium
Implementation Method 2
a control unit that gives tension to the recording medium by controlling the torque of the first drive roller based on the tension of the recording medium detected by the detection unit
Implementation Method 3
a transport unit that, by rotating a first drive roller and a second drive roller across which a recording medium is stretched, transports the recording medium from the first drive roller to the second drive roller
Data Source
AI summary
An image recording device including: a transport unit that transports a recording medium from a first drive roller to a second drive roller by rotating a first drive roller and a second drive roller across which a recording medium is stretched, a support member that supports the recording medium between the first drive roller and the second drive roller, a recording unit that ejects liquid on the recording medium supported on the support member and records an image, a detection unit that detects tension of the recording medium, and a control unit that gives tension to the recording medium by controlling the torque of the first drive roller based on the recording medium tension detected by the detection unit.