Sheet Feed Shaft Projections for Consistent Paper Conveying
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Solution Overview
Problem
Existing sheet feed mechanisms for printers face challenges in accurately conveying various sheet materials due to inconsistent apex angles of projections, leading to feeding unevenness and potential damage, particularly in inexperienced settings where adjustments are time-consuming and reliant on operator intuition.
Innovation Solution
A sheet feed shaft with projections formed on a metallic rod, where the apex angles α and β are defined by specific relational expressions (β=−0.002α²+0.854α−3.72 and 0.85β0≤β≤1.15β0) to ensure proper load distribution, and a manufacturing device that calculates and controls these angles to form projections suitable for different sheet materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the apex angle β in the thickness direction of the projection is set small, then feeding amount fluctuation is improved, but the projection deeply bites into the sheet material causing greater damage
Solution Approach 1:
The invention changes the geometric parameters of the projection by defining specific relationships between apex angle α (in circumferential direction) and apex angle β (in thickness direction). By setting β within a specific range relative to α through mathematical expressions, the projection shape is optimized to achieve consistent feeding while preventing excessive biting into the sheet material.
2Reliability
If the projection shape is adjusted based on operator's experience and intuition, then some sheet materials can be fed adequately, but adjustment takes time and performance is inconsistent for inexperienced combinations
Solution Approach 1:
The invention makes the system self-adjusting by incorporating mathematical relationships between apex angles directly into the projection design. The controller automatically calculates and sets the appropriate apex angle β based on the given apex angle α, eliminating the need for operators to rely on experience or perform time-consuming trial-and-adjustment processes.
Solution Approach 2:
The invention transforms the adjustment process from operator-dependent intuition to a systematic parameter relationship. By defining β as a function of α through specific mathematical expressions, the system automatically determines optimal projection geometry for different sheet materials, ensuring consistent performance regardless of operator expertise.
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 enables accurate and reliable sheet feeding with reduced unevenness and damage, stabilizing the feeding process without relying on operator experience, ensuring consistent performance across various sheet types.
Implementation Method 1
a perforating member to be attached to the holding member to form a projection on a peripherical surface of the metallic rod by plastic working to rise in a circumferential direction
Data Source
AI summary
A sheet feed shaft includes a metallic rod, and a plurality of projections formed by plastic working to rise in a circumferential direction at a plurality of regions in the circumferential direction and in an axial direction on a peripherical surface of the metallic rod. α and β satisfy following relations (a) and (b) in a range that the α is not less than 300 and not more than 110°,β0=−0.002α2+0.854α−3.72, (a)0.85×β0≤β≤1.15β0, (b)where an apex angle of the projections viewed from the circumferential direction of the metallic rod is defined as α, and an apex angle of the projections viewed from an axial direction of the metallic rod is defined as β.