Roll Paper Holder Detection for Narrow Widths
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Solution Overview
Problem
Existing printing devices lack a structure to accommodate roll paper with narrow widths, causing the remaining amount detecting section to be blocked by partition portions, preventing accurate detection of roll paper remaining amounts.
Innovation Solution
A printing device with a roll paper holder that accommodates both standard and narrow-width roll papers, featuring a remaining amount detecting section and a partition portion with a detection assistance section, which includes projections to detect the remaining amount of narrow-width roll papers by adjusting its position based on the roll paper diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a partition portion is installed in the roll paper holder to accommodate narrow-width roll paper, then the adaptability of the printing device is improved, but the remaining amount detecting section is blocked by the partition portion, causing the measurement precision to deteriorate
Solution Approach 1:
The partition portion is divided into two functional segments: a first partition wall that contacts the narrow-width roll paper to prevent displacement, and a second partition wall that extends to guide the roll paper. This segmentation allows the partition to fulfill its structural support function while minimizing obstruction to the detection path of the remaining amount detecting section.
Solution Approach 2:
The partition portion is designed with selective height in different dimensions. The first partition wall has a height sufficient to contact the roll paper, while the second partition wall extends further to guide the roll paper. This dimensional variation allows the partition to provide comprehensive support for narrow-width roll papers without uniformly blocking the detection area, thus resolving the contradiction between adaptability and measurement precision.
2Stability of the object's composition
If the partition portion is made tall to securely hold narrow-width roll paper, then the stability of the roll paper is improved, but the detection assistance section cannot properly detect the remaining amount, causing the measurement precision to deteriorate
Solution Approach 1:
The partition portion is designed with different local qualities at different locations. The first partition wall has sufficient height to contact and stabilize the narrow-width roll paper, providing local stability where needed. The second partition wall extends further to guide the roll paper. This local quality differentiation allows the partition to provide comprehensive support while maintaining detection capability, resolving the contradiction between stability and measurement precision.
Data Source
AI summary
A printing device includes a roll paper holder configured to accommodate a first roll paper and a second roll paper and having first and second side walls configured to contact side surfaces of the first roll paper, a remaining amount detecting section having a first projection projecting from the first side wall to detect a remaining amount of the first roll paper accommodated in the roll paper holder, a roll paper guide configured to be installed in the roll paper holder and having a third side wall configured to contact a side surface of the second roll paper when the second roll paper is accommodated in the roll paper holder, and a detection assistance section provided on the roll paper guide and having a second projection projecting from the third side wall in a state of being in contact with the first projection.