Printer Guide Piece in Depressed Portion for Back Feeding Alignment
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Solution Overview
Problem
During the back feeding process in label printers, deflection of continuous paper leads to a loss of tension, causing the paper to deviate from the guided range, resulting in deteriorated printing quality due to the inability of the damper to bias the paper effectively.
Innovation Solution
A printer design that includes a movement restricting portion with a guide piece housed in a depressed portion, where the guide piece abuts the side edge of the paper, ensuring it remains within the guided range, even during deflection, and a damper portion that provides tension to the paper, with the inner damper positioned downstream to maintain paper alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the continuous paper is fed backward during back feeding, then the next label can be positioned for printing, but the paper deflects and loses tension, causing it to deviate from the guide range
Solution Approach 1:
The patent introduces a depressed portion (a third dimension/depth element) in the feed path where the continuous paper temporarily sinks during back feeding. This dimensional change allows the paper to be contained and guided properly without deflecting outward, resolving the contradiction between enabling back feeding and maintaining printing position accuracy
Solution Approach 2:
The guide piece acts as an intermediary element that is housed in the depressed portion and contacts the side edge of the continuous paper. This intermediary structure prevents the paper from deviating during back feeding while allowing the damper to maintain tension, thus enabling both productive back feeding and precise printing alignment
2Stability of the object's composition
If the damper biases the continuous paper during forward feeding, then the paper remains aligned, but during back feeding the damper can no longer bias the paper effectively due to loss of tension
Solution Approach 1:
The depressed portion creates a localized three-dimensional space that maintains the geometric relationship between the damper and the continuous paper during back feeding. By confining the paper within the depressed portion, the damper can continue to exert biasing force effectively even when the paper is being fed backward, thus maintaining both alignment stability and tension reliability
Solution Approach 2:
The guide piece serves as a mediator that works in conjunction with the damper to maintain paper tension and alignment during back feeding. The guide piece prevents lateral deviation while the damper maintains longitudinal tension, ensuring the paper remains properly biased and aligned throughout the back feeding process
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
Prevents deterioration of printing quality by maintaining paper alignment and tension during back feeding, ensuring consistent printing position and density.
Implementation Method 1
a damper portion disposed between the printing unit and the medium supply unit, the damper portion being configured to give tension to the print medium
Data Source
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AI summary
A printer includes a medium supply unit, a printing unit, a feed unit, which feeds a print medium along a feed direction that is any one of a first direction toward the printing unit from the medium supply unit or a second direction toward the medium supply unit from the printing unit on a reference surface, a depressed portion, which is disposed using the reference surface as a reference, and a movement restricting portion, which includes a guide piece and restricts a movement of the print medium to a direction perpendicular to the feed direction of the print medium by housing at least a part of the guide piece in the depressed portion and abutting a side edge of the print medium on the guide piece, and a side edge on a side of the printing unit of the guide piece is disposed at a position close to an inner wall surface on the printing unit side of the depressed portion with respect to an inner wall surface on a side of the medium supply unit of the depressed portion.