Printer Driver Linefeed Adjustment for Transport Error
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Solution Overview
Problem
Existing image recording apparatuses face errors in sheet transport due to instantaneous force applied by transport rollers, leading to variations in transport amount and affecting image quality, while stopping sheets before transport rollers increases recording time.
Innovation Solution
An image recording apparatus with a controller that determines linefeed amounts and adjusts them to prevent the sheet from traveling past the transport roller pair while it is decelerating, ensuring accurate transport and reducing recording time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the sheet is stopped at a fixed position immediately before traveling past the transport roller pair, then the variation among sheets of errors in the transport amount is reduced, but the error in the transport amount of the sheet traveling past the transport roller pair is not reduced, adversely affecting image quality
Solution Approach 1:
The controller performs preliminary identification of linefeed operations that would cause the sheet to travel past the roller pair during deceleration, and pre-calculates adjusted linefeed amounts before execution. This preliminary planning prevents transport errors without requiring stopping the sheet at fixed positions, thereby maintaining both stability and precision.
Solution Approach 2:
The controller dynamically adjusts the linefeed amount parameter based on the deceleration state of the roller pair. By changing the linefeed amount from the determined value to an adjusted value when deceleration is detected, the system optimizes transport precision without sacrificing overall stability or requiring additional stopping operations.
2Manufacturing precision
If the sheet is stopped at a fixed position immediately before traveling past the transport roller pair, then the transport amount is controlled, but the time required for completing image recording on the sheet is extended, impeding high-speed image recording
Solution Approach 1:
The controller identifies and plans adjusted linefeed operations in advance based on predicted deceleration events, rather than reacting by stopping the sheet during recording. This preliminary planning allows continuous high-speed operation while maintaining precise transport control through pre-calculated adjustments.
Solution Approach 2:
The system dynamically adjusts linefeed amounts in real-time based on the actual deceleration state of the roller pair during operation. This dynamic adaptation enables precise transport control without fixed stopping positions, maintaining both accuracy and high-speed productivity throughout the recording process.
3Stability of the object's composition
If the transport rollers are brought into contact with each other after the sheet travels past them, then an instantaneous force applies to the sheet in the transport direction, but this causes an error in the transport amount of the sheet
Solution Approach 1:
The controller monitors the deceleration state of the roller pair as feedback and uses this information to adjust linefeed amounts accordingly. This feedback mechanism compensates for the instantaneous force effect during deceleration, maintaining transport precision without disrupting the natural contact and deceleration process of the rollers.
Data Source
AI summary
An image recording apparatus includes a roller pair for transporting a sheet, a recording head, and a controller. The controller determines a linefeed amount by which the sheet is transported by the roller pair between corresponding two adjacent passes of the recording head. The controller executes image recording on the sheet by alternately repeating a linefeed operation for rotating the roller pair by the determined linefeed amount to transport the sheet in a transport direction, and a pass recording operation in which the controller causes the roller pair to stop and the recording head to perform a pass and to record part of an image on the sheet. Upon determining that a linefeed operation would cause the sheet to travel past the roller pair while the roller pair is decelerating, replace for the linefeed operation a determined linefeed amount by an adjusted linefeed amount.