Recording Apparatus Sheet Conveyance Abnormality Handling
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Solution Overview
Problem
Current recording apparatuses lack effective conveyance abnormality handling for both cut sheets and continuous sheets, leading to unnecessary waste when trying to discharge continuous paper.
Innovation Solution
A recording apparatus with separate conveyance paths for cut sheets and continuous sheets, along with a common path, and a control system that manages sheet conveyance, allowing for appropriate jam handling by detecting abnormalities and selectively discharging cut sheets from the first conveyance path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conventional control method (rotating conveyance roller to discharge sheet) is applied to continuous sheet recording, then conveyance abnormality handling is performed, but continuous paper is discharged more than necessary increasing waste paper
Solution Approach 1:
The patent segments the sheet conveyance system into two distinct conveyance paths: a first conveyance path for cut sheets and a second conveyance path for continuous sheets. This segmentation allows the control apparatus to identify which path the sheet is traveling through and apply appropriate discharge control, preventing unnecessary discharge of continuous sheets while maintaining effective jam handling for cut sheets.
Solution Approach 2:
The patent implements dynamic control by making the discharge operation conditional based on real-time detection of sheet type and conveyance path. The control apparatus dynamically adjusts the discharge behavior: it performs discharge operations for jams in the first conveyance path (cut sheets) but suppresses discharge operations for jams in the second conveyance path (continuous sheets), adapting the system behavior to the current operating mode.
2Device complexity
If a single conveyance path is used for both cut sheets and continuous sheets, then device complexity is reduced, but appropriate conveyance abnormality handling cannot be performed for different sheet types
Solution Approach 1:
The patent divides the conveyance system into segmented paths (first conveyance path for cut sheets, second conveyance path for continuous sheets) that merge into a common conveyance path. This segmentation enables the system to track and identify which type of sheet is being conveyed, allowing appropriate abnormality handling for each sheet type while sharing common components.
Solution Approach 2:
The patent creates a universal conveyance system where the common conveyance path and recording portion can handle both cut sheets and continuous sheets. The control apparatus provides multi-functionality by detecting the sheet type and conveyance path, then applying the appropriate discharge control strategy, making the same hardware capable of handling multiple sheet types appropriately.
Data Source
AI summary
A recording apparatus includes a recording portion that records an image on a sheet, a first conveyance path in which a cut sheet serving as the sheet is conveyed toward the recording portion, a second conveyance path in which a continuous sheet serving as the sheet is conveyed toward the recording portion, a common conveyance path in which the sheet is conveyed in a conveying direction from a junction point at which the first conveyance path and the second conveyance path join together to the recording portion, and a control portion that controls the conveyance of the sheet. When the sheet is not detected in the second conveyance path after a sheet conveyance abnormality is detected, while the sheet is detected in the common conveyance path, the control portion performs a discharge operation of conveying the cut sheet from the first conveyance path toward the recording portion.