Image Recording Apparatus Sheet Feeding Path Switching Mechanism
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Solution Overview
Problem
Conventional image recording apparatuses require a large path-switching flap to direct sheets between main and resupply feeding paths, hindering downsizing efforts due to the need for significant space.
Innovation Solution
An image recording apparatus design featuring a first and second feeding path with guide members and rollers that allow sheets to be directed from the main path to a connected obliquely downward resupply path without a flap, using upper and lower-position guide members and rollers to manage sheet flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flap is used as the path-switching portion to direct sheets between main and resupply feeding paths, then the sheet can be switched between paths, but the apparatus size increases due to the large space required for the flap structure
Solution Approach 1:
The invention extracts and eliminates the flap component from the path-switching mechanism. Instead of using a traditional flap that pivots to direct sheets, the patent employs a fixed guide member configuration with selective engagement of guide members based on sheet size, thereby removing the need for moving path-switching parts and reducing apparatus volume.
Solution Approach 2:
The guide members are segmented into multiple discrete elements (first guide member, second guide member, third guide member) that can be selectively positioned or engaged. This segmentation allows the system to achieve path switching functionality through selective engagement of different guide member combinations rather than a single large movable flap.
2Reliability
If a large flap structure is used for path switching, then reliable sheet direction control is achieved, but the apparatus cannot be downsized
Solution Approach 1:
The invention introduces a guide member as an intermediary element between the sheet and the feeding paths. The guide member, rather than a large flap, serves as the mediating structure that directs sheets. By using a smaller, more compact guide member configuration, the system maintains reliable sheet direction control while reducing the space required.
Solution Approach 2:
The patent transitions from a two-dimensional flap movement (pivoting in a plane) to a three-dimensional arrangement of guide members that can be selectively engaged. This dimensional change allows for more compact space utilization while maintaining the sheet direction control function through vertical and lateral positioning of guide members rather than large horizontal flap movement.
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
Enables sheet transfer to the resupply path without a path-switching flap, reducing the apparatus size and improving space efficiency while maintaining double-face printing capabilities.
Implementation Method 1
a second feeding portion comprising at least one pair of rollers each consisting of an upper-position roller and a lower-position roller
Data Source
AI summary
An image recording apparatus includes a first upper-position guide member, a first lower-position guide member defining a first feeding path and a first feeding portion feeding a sheet in a feeding direction along the first feeding path. The image recording apparatus further includes a recording portion located downstream of the first feeding portion in the feeding direction, a second upper-position guide member, a second lower-position guide member defining a second feeding path and a second feeding portion comprising at least one pair of rollers each consisting of an upper-position roller and a lower-position roller. The second feeding portion feeds the sheet along the second feeding path and a first axis of the upper-position roller is located upstream of a second axis of the lower-position roller in the feeding direction.


