Sensor Unit Protection Member for Sheet Conveyance
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Solution Overview
Problem
Conventional sheet conveyance devices are prone to malfunction due to foreign objects like staples and clips dropping onto control circuit boards, causing short-circuits and breakage, especially when a protection member like adhesive tape deteriorates over time and is costly to apply accurately.
Innovation Solution
A protection member with a hole portion is provided to cover the control circuit board, positioning the sensor unit within this hole to prevent foreign objects from reaching the circuit board, using abutting and claw-shaped engaging portions for secure attachment, and ensuring a small gap between the sensor and the protection member to prevent object contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hole is provided in the conveyance guide for ultrasonic wave transmission, then the sensor can detect sheets, but foreign objects may drop through the hole and cause malfunction
Solution Approach 1:
A protection member is introduced as an intermediary component between the conveyance guide hole and the control circuit board. This protection member allows ultrasonic waves to pass through while blocking foreign objects from reaching the circuit board, thus resolving the contradiction between sensor functionality and protection against harmful factors.
Solution Approach 2:
The protection member is implemented as a thin film or shell structure that can be positioned over the hole in the conveyance guide. This thin protective layer allows the sensor to function while preventing foreign objects from causing damage to the control circuit board.
2Object-affected harmful factors
If adhesive tape is used to protect the control circuit board, then foreign objects are blocked, but the tape may peel off due to temperature and humidity changes
Solution Approach 1:
Instead of using adhesive tape that may deteriorate, a more durable protection member is provided that can be securely attached to the conveyance guide. This protection member maintains its protective function without peeling off due to environmental changes.
3Object-affected harmful factors
If adhesive tape is stuck on the control circuit board, then protection is provided, but manufacturing cost increases due to the need for high sticking position accuracy
Solution Approach 1:
The protection member is attached to the conveyance guide rather than directly to the control circuit board. This intermediary approach simplifies the manufacturing process by eliminating the need for precise adhesive placement on the circuit board, thereby reducing manufacturing costs while maintaining protection.
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
This configuration effectively prevents short-circuits and breakage by blocking foreign objects from reaching the control circuit board, maintaining sensor functionality while reducing manufacturing costs and ensuring accurate positioning.
Implementation Method 1
the reception-side double feed detection sensor receives an ultrasonic wave signal transmitted from the transmission-side double feed detection sensor
Data Source
AI summary
A double feed detection sensor unit includes a double feed detection sensor for detecting a document via a hole on a conveyance guide, a control circuit board on which the double feed detection sensor and an element are provided, and a protection member provided to cover the element.