ADF Document Stopper Unlocking Mechanism for Jam Prevention
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Solution Overview
Problem
Conventional automatic document feeding (ADF) devices experience paper jams and motor stalling due to friction between the document stopper and latch arm when multiple documents are stacked, requiring additional motors that increase complexity and power consumption.
Innovation Solution
The ADF device incorporates a document stopper that unlocks via a latch arm mechanism, utilizing a clutching unit with a spring and flag to facilitate rotation without additional motors, ensuring consistent document feeding even with multiple documents stacked.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate motor is added to rotate the bracket, then the document stopper can be unlocked reliably, but the device complexity increases
Solution Approach 1:
A flag is introduced as an intermediary component that translates the rotational motion of the ADF roller shaft into linear motion to push the latch arm, thereby unlocking the document stopper without requiring an additional motor
Solution Approach 2:
The system uses its own existing motor and rotational components (ADF roller shaft) to automatically unlock the document stopper through the flag mechanism, eliminating the need for external assistance or additional motors
2Reliability
If a separate motor is added to rotate the bracket, then the document stopper can be unlocked reliably, but the power consumption increases
Solution Approach 1:
The existing ADF roller shaft motor performs dual functions: driving document transport and unlocking the document stopper through the flag mechanism, thereby eliminating the need for additional power consumption from a separate motor
3Reliability
If friction between latch arm and document stopper is high, then the document stopper remains locked, but the bracket cannot rotate to pick up documents
Solution Approach 1:
The unlocking mechanism is segmented into distinct functional components: the latch arm for locking, the flag for unlocking, and the ADF roller shaft for driving, allowing independent optimization of locking stability and rotation capability
Solution Approach 2:
The system dynamically transitions between locked and unlocked states through the flag mechanism, which converts continuous rotational motion into discrete linear pushing motion to release the latch arm at the appropriate moment
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 paper jams and motor stalling by ensuring the document stopper unlocks reliably, simplifying the device configuration and reducing power consumption by eliminating the need for a separate motor.
Implementation Method 1
a spring that elastically acts on the flag
Implementation Method 2
The ADF roller 3 rotating in a counter-clockwise direction feeds the uppermost document D of the transported one through several documents D to a scanning unit (not shown)
Data Source
AI summary
An automatic document feeding (ADF) device includes a document feed tray wherein documents are stacked, a shaft rotatably disposed on the document feed tray, an automatic document feeding roller rotatably coupled to the shaft and transporting the documents one by one, a bracket rotatably coupled to the shaft, a pick-up roller rotatably coupled to the bracket and picking up the documents stacked on the document feed tray by using a rotating force received from the shaft, a document stopper disposed to be able to rotate about the same axis as the pick-up roller rotates about and limiting a movement of the documents stacked on the document feed tray, a latch arm locking the document stopper to limit the movement of the documents and prevent the document stopper from rotating, and a flag rotatably coupled to the shaft and pushing the latch arm to unlock the document stopper.