Printer Upper Guide Centering Mechanism
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Solution Overview
Problem
In clamshell printers, the gap between the upper guide and paper-width-direction regulating guides can cause paper to be taken into the gap and folded, especially with flexible thin paper, due to dimensional inaccuracies and the play in printer covers that allows the upper guide to lean, creating uneven gaps when the cover is closed.
Innovation Solution
Elastic urging members with projecting portions are provided on the upper guide and paper-width-direction regulating guides to ensure the upper guide is centered between the side guides, maintaining even gaps and preventing paper from being taken into the gap, while allowing smooth operation of the printer cover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a gap is provided between the upper guide and side guides to allow smooth opening and closing of the printer cover, then the ease of operation is improved, but the paper may be taken into the gap and folded
Solution Approach 1:
The upper guide is made movable in the paper width direction through the introduction of urging members (springs), allowing it to dynamically adjust its position. This enables the gap to remain small enough to prevent paper folding while still allowing sufficient movement for cover operation. The urging members provide a restoring force that centers the upper guide between the side guides, maintaining optimal gap dimensions throughout the cover's opening and closing cycle.
2Manufacturing precision
If dimensional accuracy of components is improved to reduce the gap size, then the paper folding prevention is improved, but the play in printer cover causing upper guide deflection remains
Solution Approach 1:
The invention changes the physical state of the upper guide assembly by introducing elastic urging members (springs). This transforms the rigid, dimensionally-dependent gap control into an elastic, force-balanced system. The urging members generate a restoring force that actively centers the upper guide between the side guides, compensating for dimensional variations and cover play without requiring extremely tight manufacturing tolerances.
3Measurement precision
If the outer width of upper guide inclusive of urging member projecting portions is greater than the inner width of side guides, then the upper guide is centered between side guides, but the device complexity increases
Solution Approach 1:
The urging members are integrated directly into the upper guide structure, merging the centering function with the guide itself. The projecting portions of the urging members become part of the upper guide's effective width, and the urging members serve dual purposes: providing the centering force and defining the gap dimensions. This integration reduces the need for separate, complex centering 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
The solution effectively prevents paper from being folded by maintaining consistent, small gaps between the upper guide and side guides, ensuring smooth opening and closing of the printer cover without paper interference, even with flexible papers.
Implementation Method 1
an urging member of elasticity is provided with a projecting portion that projects toward the paper-width-direction regulating guide
Data Source
AI summary
A paper conveying mechanism includes an elastic urging member provided on each side surface of an upper guide. The urging member includes a projecting portion that projects toward a side guide forming each end of a paper conveying path. An outer width of the upper guide inclusive of the projecting portion is greater than an inner width of the side guides. When a printer cover is closed, the upper guide is urged by the urging member substantially to the center of the inner width of the side guides, thereby producing gaps of substantially equal size on both sides of the upper guide in the paper width direction.