Sheet Transport Apparatus Air Flow Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In image forming apparatuses with multiple transport paths, existing methods require multiple air-blowing fans and exhaust ducts to prevent paper jams, leading to increased manufacturing costs and apparatus size due to unnecessary air flow into unused paths.
Innovation Solution
A sheet transport apparatus with a movable guide portion that selectively directs sheets between transport paths, incorporating an air-blowing unit that blows air into the paths through a ventilation portion, allowing for targeted air flow without the need for multiple fans and ducts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air-blowing fans and exhaust ducts are disposed in each transport path, then steam exhaust capability is improved, but apparatus size and manufacturing cost increase
Solution Approach 1:
The patent merges the air-blowing function into a single shared unit that serves multiple transport paths through the movable guide portion. Instead of having separate fans for each path, one fan blows air through the ventilation portion to the movable guide, which then directs air to the active transport path. This consolidation reduces the number of components and apparatus size while maintaining steam exhaust capability.
Solution Approach 2:
The movable guide portion dynamically directs air flow to different transport paths based on which path is actively transporting sheets. The guide can move between positions to align the ventilation portion with either the first or second transport path, enabling a single air-blowing unit to adaptively serve multiple paths without requiring fixed infrastructure in each path.
2Device complexity
If communication ducts connect multiple transport paths to a single air-blowing fan, then apparatus size is reduced, but air flows into unused transport paths reducing efficiency
Solution Approach 1:
The movable guide portion acts as a dynamic flow controller that directs air exclusively to the active transport path. When the first transport path is active, the movable guide positions the ventilation portion to blow air into the first path; when the second path is active, the guide moves to direct air into the second path. This dynamic positioning prevents air from flowing into unused paths, eliminating energy waste while maintaining a compact single-fan configuration.
3Reliability
If air-blowing fan power is increased to compensate for air leakage into unused paths, then steam exhaust capability is maintained, but power consumption and apparatus size increase
Solution Approach 1:
The movable guide portion dynamically positions the ventilation portion to align with the active transport path, creating a focused air flow channel. This prevents air leakage into unused paths, so the air-blowing fan only needs to provide sufficient power for the active path rather than compensating for distributed losses across multiple paths. This reduces power consumption while maintaining effective steam exhaust capability.
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
This configuration effectively prevents paper jams by ensuring sufficient air flow only in active transport paths, reducing the size and cost of the apparatus while maintaining efficient steam removal.
Implementation Method 1
there has been a problem in that a sheet becomes stuck in a transport path (such a phenomenon will hereinafter be referred to as a paper jam) as a result of condensation occurring in an apparatus and in the transport path caused by steam generated by the sheet
Data Source
AI summary
A sheet transport apparatus includes a transport guide that is included in a first transport path along which a sheet is to be transported and a flapper that selectively guides the sheet, which is transported by passing through the first transport path, to a second transport path and a third transport path. The transport guide has an air-blowing hole that is positioned further upstream than the flapper in a transport direction of the sheet. The sheet transport apparatus further includes an air-blowing fan that blows air to the flapper from outside the first transport path via the air-blowing hole.