Sheet Detection Pressing Mechanism for Accurate Media Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The detection accuracy of sheet type in image forming apparatuses is reduced due to positional fluctuation or flapping of sheets at the measurement position of media sensors, particularly affecting optical sensors, and pressing members to suppress flapping can cause sheet conveyance failures.
Innovation Solution
A movable pressing member is used to stabilize the sheet position during measurement, moving between a separated position and a closer position based on the detection of the sheet's presence, ensuring accurate feature amount measurement without causing conveyance issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressing member is used to suppress sheet flapping during measurement, then measurement precision is improved, but sheet conveyance reliability deteriorates due to paper jams
Solution Approach 1:
The pressing member is made movable between a first position (separated from the sheet) and a second position (pressing the sheet). The moving unit dynamically adjusts the pressing member's position based on whether the sheet has reached the measurement position, allowing the system to optimize between measurement precision and conveyance reliability at different operational stages
Solution Approach 2:
The system detects sheet arrival at the measurement position in advance and only then activates the pressing member to move to the second position. This preliminary detection and conditional activation prevents unnecessary pressing that could cause paper jams, while ensuring pressing is applied timely to improve measurement precision
2Stability of the object's composition
If the pressing member is positioned close to the measurement unit, then sheet position stability is improved, but sheet conveyance fails due to pressing interference
Solution Approach 1:
The pressing member's position is dynamically controlled based on sheet presence detection. When the sheet is not at the measurement position, the pressing member remains at the first position (separated) to avoid interfering with conveyance. When the sheet arrives, the pressing member moves to the second position (close to measurement unit) to stabilize the sheet for accurate measurement
Solution Approach 2:
The harmful pressing action is extracted and separated from the continuous conveyance process. The pressing member is only activated (moved to second position) during the specific moment when the sheet is at the measurement position, removing the harmful effect during other phases of conveyance
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 enhances sheet detection accuracy while preventing sheet conveyance failures by stabilizing the sheet position during measurement, improving the reliability of sheet type discrimination.
Implementation Method 1
The media sensor measures feature amounts of the sheet by using, for example, an optical sensor or an ultrasonic wave sensor
Implementation Method 2
The media sensor measures feature amounts of the sheet by using, for example, an optical sensor or an ultrasonic wave sensor
Data Source
AI summary
A sheet detection device includes a measurement unit for measuring a feature amount of a sheet conveyed by a conveyance unit, a pressing member movable between a first position separated from the measurement unit and a second position closer to the measurement unit than the first position, and a moving unit configured to move the pressing member, wherein the pressing member is arranged by the moving unit at the first position in a case where the measurement unit detects that the sheet has not been conveyed to a measurement position of the measurement unit, wherein the moving unit is configured to move the pressing member from the first position to the second position in a case where the measurement unit detects that the sheet has been conveyed to the measurement position of the measurement unit.