Sheet Feed Pressing Mechanism for Jammed Paper Removal
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Solution Overview
Problem
Conveyance in sheet feed devices often stops when a sheet is nipped between rollers, especially when the openable cover is opened during an operation, leading to cumbersome sheet removal and potential damage to the device.
Innovation Solution
A sheet feed device with a pressing member that presses back sheets nipped between rollers toward the stacking tray at predetermined timings, using sensors to detect sheet presence and operation states, and a roller separating mechanism to facilitate easy sheet removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the openable cover is opened during sheet feeding operation, then the user can access the stacking tray for sheet supply, but the sheet conveyance stops with the sheet nipped between feed rollers
Solution Approach 1:
The pressing member performs preliminary action by pressing the sheet back toward the stacking tray before the user can remove it, preventing the sheet from remaining nipped between the feed rollers when the cover is opened during operation
2Reliability
If the sheet remains nipped between feed rollers after conveyance stop, then the sheet can be held in position, but the sheet supply operation is hindered and device damage risk increases
Solution Approach 1:
The pressing member extracts the sheet from the nipped state between feed rollers by pressing it back toward the stacking tray, removing the harmful condition of the sheet being trapped and potentially damaging the device
3Ease of operation
If conventional sheet feed devices allow free sheet removal, then user access is easy, but sheets may remain nipped and cause operational issues
Solution Approach 1:
The pressing member provides self-service by automatically pressing the sheet back toward the stacking tray at predetermined timings, eliminating the need for user intervention to prevent sheets from remaining nipped between rollers
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
Prevents sheets from remaining nipped between rollers, ensuring smooth sheet supply operations and reducing the risk of damage to the device during openable cover usage.
Implementation Method 1
a pressing member configured to perform operation for pressing back a sheet that has been picked up from the stacking tray and is in a state of being nipped between the sheet feed rollers toward the stacking tray
Data Source
AI summary
A sheet feed device includes a stacking tray on which sheets P are stacked, and feed rollers convey the sheets P from the stacking tray. The sheet feed device also includes a pressing lever configured to press back, when there is a sheet picked up from the stacking tray and is in a state of being nipped between feed rollers, a leading end of the sheet P toward the stacking tray, and a roller separating mechanism configured to separate the sheet feed rollers performing the nipping from each other, when the pressing member performs the operation of pressing back the sheet.