Print Control Apparatus for Roll Paper Double-Sided Printing
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Solution Overview
Problem
Conventional printing technologies face issues with double-sided printing on roll paper, such as unevenness and paper slip due to differences in print medium shape and weight between the front and back surfaces, leading to suboptimal printing results and potential conveyance problems.
Innovation Solution
A print control apparatus that includes a reception unit for double-sided printing jobs, a print control unit for printing on roll-shaped media, a drive control unit for managing the printing process, and a cutting control unit for cutting the roll paper after printing the first surface, using distinct drive parameters for each surface to address the shape and weight differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same driving force is used for both roll paper and cut paper, then the printing apparatus can maintain simple control logic, but paper slip occurs due to the weight difference between roll paper and cut paper
Solution Approach 1:
The patent applies dynamics by making the driving force adjustable rather than fixed. The control unit dynamically changes the driving force magnitude based on the detected print medium type (roll paper or cut paper), allowing the system to adapt to different weight conditions and prevent paper slip while maintaining simple control logic
Solution Approach 2:
The patent changes the physical parameter of driving force magnitude according to the print medium type. By detecting whether roll paper or cut paper is loaded and adjusting the corresponding driving force parameter, the system resolves the contradiction between simple control logic and conveyance precision
2Power
If a large driving force is applied to convey heavy roll paper, then roll paper can be conveyed properly, but cut paper is conveyed with excessive force causing paper slip
Solution Approach 1:
The system dynamically adjusts the driving force magnitude based on the detected print medium type. When roll paper is detected, a larger driving force is applied; when cut paper is detected, a smaller driving force is applied, preventing both under-conveyance and over-conveyance scenarios
Solution Approach 2:
The control unit changes the driving force parameter according to the print medium type detection results, optimizing the power application to match the actual load conditions and maintain precise conveyance control
3Area of stationary object
If roll paper is used for double-sided printing, then large area printing is enabled, but the shape change after cutting causes unevenness in printing
Solution Approach 1:
The patent applies preliminary action by detecting the print medium type before the printing process begins. This advance detection allows the control unit to pre-adjust the driving force and other printing parameters according to the specific medium type, preventing printing unevenness before it occurs
Solution Approach 2:
The system changes multiple printing parameters including driving force, conveyance speed, and suction force according to the detected print medium type, ensuring optimal printing conditions for both roll paper and cut paper while maintaining large area printing capability
Data Source
AI summary
An embodiment of the present invention is directed to reducing problems in double-sided printing using roll paper. An apparatus in the embodiment includes a unit configured to cause a print unit to print on a roll-shaped print medium based on a received job for roll paper, a unit configured to control drive upon printing on the roll-shaped print medium, and a unit configured to cause a cutting unit to cut the roll-shaped print medium after printing the first surface of the roll-shaped print medium. The apparatus controls drive based on a first drive parameter for suppressing a first sheet-floating upon printing on the first surface of the roll-shaped print medium, and controls drive based on a second drive parameter for suppressing a second sheet-floating upon printing on the second surface of a cut print medium.