Printing Apparatus Roller Speed Control for Ink Timing
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Solution Overview
Problem
Existing printing technologies face challenges in maintaining appropriate discharge timing of liquid from a discharging head due to mismatched circumferential speeds between the driving roller and the driven rotational member, particularly when the recording medium is transported at high speeds, leading to difficulties in ink discharge from the discharging head.
Innovation Solution
A printing apparatus and method that adjust the rotational speed of the driving roller based on the linear pressure applied to the recording medium, using tension adjustments and coefficients specific to the type of recording medium, to ensure the transport speed of the recording medium is within an appropriate range, thereby synchronizing the discharge timing with the rotation position of the driven rotational member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transport speed of the recording medium is increased, then productivity is improved, but the discharge timing of liquid from the discharging head becomes inappropriate
Solution Approach 1:
The system dynamically adjusts the rotational speed of the driving roller based on the detected circumferential speed of the driven rotational member. The control unit modifies the driving roller's speed in real-time to compensate for speed differences, ensuring the recording medium transport speed remains within the appropriate range for accurate liquid discharge timing even at high productivity levels.
Solution Approach 2:
The rotation position detection unit continuously monitors the rotation position and circumferential speed of the driven rotational member. This feedback information is fed to the control unit, which compares the detected speed with the target speed and adjusts the driving roller's rotational speed accordingly to maintain synchronization between the recording medium transport and liquid discharge timing.
2Speed
If the circumferential speed of the driven rotational member exceeds that of the driving roller, then the transport speed becomes too fast, but maintaining speed matching increases device complexity
Solution Approach 1:
The system uses the driven rotational member's own rotation detection to self-regulate the driving roller's speed. The rotation position detection unit on the driven rotational member provides the necessary feedback, and the control unit automatically adjusts the driving roller speed based on this self-generated information, eliminating the need for external speed sensors on the driving roller or complex mechanical speed matching mechanisms.
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 approach effectively suppresses the transport speed of the recording medium to an appropriate range, ensuring consistent and accurate ink discharge from the discharging head, even when the circumferential speed of the driven rotational member exceeds that of the driving roller.
Implementation Method 1
a driving roller configured to transport a recording medium by rotation of the driving roller while being in contact with the recording medium
Implementation Method 2
a driven rotational member configured to be driven to rotate as a result of transport of the recording medium while being in contact with the recording medium
Data Source
AI summary
A printing apparatus includes: a driving roller configured to drive a recording medium by rotation thereof while being in contact with the recording medium; a discharging head configured to discharge liquid onto a recording medium; a driven rotational member configured to be driven to rotate as a result of transport of the recording medium while being in contact with the recording medium; a rotation position detection unit configured to detect a rotation position of the driven rotational member; and a control unit configured to rotate the driving roller to transport the recording medium and adjust a timing of discharging the liquid from the discharging head in accordance with a detection result of the rotation position detection unit. The control unit adjusts a rotational speed of the driving roller in accordance with a linear pressure applied to the recording medium on the driving roller.