Conveyance Device Movable Reflection Preventing Member
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Solution Overview
Problem
Existing conveyance devices face issues with erroneous detection due to dust accumulation on optical sensors when detecting the leading end of paper, as dust from paper powder and other sources interferes with the detection light, leading to inaccurate readings.
Innovation Solution
A conveyance device with a movable reflection preventing member that retracts after detecting the paper leading end, reducing dust accumulation and minimizing erroneous detection by using a flocked cloth or dark-colored coating to absorb detection light and prevent reflection from dust, and a movable body that covers the reflection preventing member to maintain cleanliness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a reflection-type optical sensor is used to detect the leading end of paper, then detection capability is improved, but dust accumulation on the sensor causes erroneous detection
Solution Approach 1:
The invention extracts and removes the harmful reflective surface from the optical sensor assembly by introducing a movable blackening member that covers the reflection preventing member. This separation isolates the light-receiving function from the dust accumulation problem, allowing the sensor to maintain detection accuracy while preventing erroneous detection from dust-induced reflections.
Solution Approach 2:
The movable blackening member acts as an intermediary element between the detection light and the reflection preventing member. By introducing this intermediate component, the system prevents direct interaction between dust on the reflection preventing member and the detection light, thereby eliminating the source of erroneous detection while preserving the ability to detect paper leading edges accurately.
2Object-affected harmful factors
If a reflection preventing member is provided to prevent dust attachment, then dust accumulation is reduced, but the structure becomes more complex
Solution Approach 1:
The invention applies dynamics by making the blackening member movable rather than fixed. The blackening member moves between a covering position (when no paper is present) and a retracted position (when paper is being detected), allowing the system to adapt its configuration based on operational needs. This dynamic approach prevents dust accumulation during non-detection periods while maintaining simplicity during active detection.
Solution Approach 2:
The movable blackening member performs periodic action by alternating between covering and retracting states based on the presence of paper. During periods when paper is not being conveyed, the blackening member covers the reflection preventing member to prevent dust accumulation. When paper is detected, the member retracts to allow detection. This periodic operation reduces overall dust accumulation without requiring permanent structural modifications.
3Speed
If the optical sensor is exposed to the conveyance path, then detection response is improved, but dust from paper powder attaches to the sensor
Solution Approach 1:
The invention applies preliminary action by positioning the movable blackening member to cover the reflection preventing member before paper enters the detection area. This preliminary covering prevents dust from attaching to critical surfaces during the period when paper is being conveyed past the sensor, ensuring that the sensor remains clean and functional for the next detection cycle while maintaining rapid response 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
The solution effectively reduces dust accumulation on the reflection preventing member, improving detection accuracy by minimizing light reflection from dust and reducing the need for frequent cleaning, thereby enhancing the reliability of paper detection.
Implementation Method 1
using a flocked cloth or dark-colored coating to absorb detection light and prevent reflection from dust
Data Source
AI summary
A conveyance device that conveys paper through a conveyance path along a surface thereof includes: a conveyance guide that has a guide surface to be a wall surface on one side of the conveyance path, an opening being formed in the guide surface; a paper detection unit at least including a detection member, which is arranged in a space that communicates with the conveyance path through the opening, and configured to detect, with the detection member, a leading end of the paper that reaches the opening; and a movable body that brings the detection member into a retracted state, in which a main part thereof is covered from the space, after the leading end of the paper is detected.