Scanning Device Clutch Mechanism for Jam Removal
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Solution Overview
Problem
Existing scanning devices face challenges in efficiently removing documents stuck due to paper jams or double feeds, which can cause mechanical stress and damage to components, and existing solutions require continuous motor operation leading to noise and wear.
Innovation Solution
A scanning device with a clutch unit that selectively connects a manual knob to document feeding rollers, allowing manual rotation only when jams occur, and a cover that opens to disconnect rollers during normal operation to prevent unnecessary motor load and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor operates continuously to convey documents, then document feeding is maintained, but wear and noise increase
Solution Approach 1:
The patent applies the dynamics principle by making the connection between the knob and document feeding rollers conditional rather than fixed. The clutch unit dynamically engages or disengages the mechanical connection based on operational needs - connected during jam removal when manual rotation is required, and disconnected during normal operation to prevent wear and noise. This dynamic switching resolves the contradiction by allowing the system to adapt its connectivity state to different operational phases.
2Ease of operation
If the knob is always connected to the rollers, then manual rotation is always possible, but unnecessary motor load and wear occur during normal operation
Solution Approach 1:
The clutch unit implements dynamic connectivity by engaging the knob to the rollers only when needed for jam removal. During normal operation, the clutch disconnects the knob, eliminating unnecessary motor load and wear. This dynamic engagement/disengagement mechanism resolves the contradiction between maintaining ease of operation and preventing component wear.
Solution Approach 2:
The patent extracts the manual rotation capability from the continuous operational state, making it available only when necessary. The clutch unit separates the knob connection from the continuous operational phase, extracting it to be available only during jam removal. This extraction principle resolves the contradiction by removing the harmful continuous connection while preserving the useful manual rotation capability when needed.
3Object-affected harmful factors
If the cover remains closed during jam removal, then the scanning path is protected, but document access is difficult
Solution Approach 1:
The cover is segmented into different functional zones or states - a closed state for normal operation that protects the scanning path, and an open state for jam removal that provides document access. The clutch unit works in coordination with the cover, being connected only when the cover is open. This segmentation resolves the contradiction by allowing the cover to serve both protective and accessible functions at different times.
Solution Approach 2:
The system dynamically transitions between closed and open cover states coordinated with the clutch engagement. The cover remains closed during normal operation to protect against contamination, and opens only when needed for jam removal. This dynamic state change resolves the contradiction between protection and accessibility.
Data Source
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AI summary
A scanning device and an image forming apparatus are provided. The scanning device includes document feeding rollers to convey a document along a document feeding path, a scanning member provided on the document feeding path to read images from the document, a cover to open and close a part of the document feeding path, a knob to manually rotate the document feeding rollers, and a clutch unit to selectively connect at least one of the document feeding rollers to the knob in correspondence with opening and closing operations of the cover.