Sheet Feeding Airflow Angles for Double-Feed Separation
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Solution Overview
Problem
Existing paper feeding devices struggle with double-feeding of media due to inadequate separation mechanisms between stacked sheets, leading to inefficiencies in the feeding process.
Innovation Solution
A feeding device that includes a supply unit to float media, a feeding unit to stick and feed the media, a separating unit to supply air obliquely downward to separate the second medium from the first, and a blasting unit to blast air obliquely downward with a larger angle than the supply angle, enhancing separation and preventing double-feeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air is supplied obliquely downward to separate the second medium from the first medium, then separation effectiveness is improved, but double-feeding may still occur due to insufficient separation force
Solution Approach 1:
The patent employs pneumatic separation by supplying air obliquely downward between stacked media. The separating unit uses air pressure to lift and separate the second medium from the first medium, preventing double-feeding while maintaining reliable separation. This pneumatic approach replaces mechanical separation methods with fluid-based separation.
Solution Approach 2:
The patent introduces a blasting unit that dynamically enhances the separation process by blasting air at a larger angle than the separating unit. This dynamic adjustment of air supply angles and pressures allows the system to adapt to different media types and stacking conditions, improving separation effectiveness without compromising feeding efficiency.
2Reliability
If a blasting unit with a larger blasting angle is added to enhance separation, then double-feeding prevention is improved, but device complexity increases
Solution Approach 1:
The patent combines the separating unit and blasting unit into a coordinated pneumatic separation system. Both units work together with complementary air supply angles - the separating unit provides baseline separation while the blasting unit enhances separation at a larger angle. This merging of functions achieves reliable double-feeding prevention through a integrated system rather than separate independent mechanisms.
Solution Approach 2:
The patent uses pneumatic principles to manage the complexity of the dual-unit system. By controlling air pressure and flow dynamics, the system achieves effective separation without requiring complex mechanical linkages or control mechanisms. The pneumatic approach simplifies the overall system architecture compared to mechanical separation methods.
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 prevents double-feeding by increasing the separation force between media sheets, ensuring smooth and efficient feeding of papers in image forming apparatuses.
Implementation Method 1
a supply unit that supplies air between a plurality of stacked media and that floats the media
Implementation Method 2
a separating unit that supplies the air obliquely downward to a front surface side of a second medium positioned immediately below a first medium stuck to the feeding unit from a downstream side to an upstream side in a medium feeding direction and that separates the second medium from the first medium
Implementation Method 3
a blasting unit that blasts the air obliquely downward to the front surface side of the second medium from the downstream side to the upstream side in the medium feeding direction and that has a blasting angle of the air with respect to the medium feeding direction larger than a supply angle of the air of the separating unit
Data Source
AI summary
A feeding device includes a supply unit that supplies air between plural stacked media and that floats the media, a feeding unit that makes the media floated by the supply unit stick thereto and that feeds the media, a separating unit that supplies the air obliquely downward to a front surface side of a second medium positioned immediately below a first medium stuck to the feeding unit from a downstream side to an upstream side in a medium feeding direction and that separates the second medium from the first medium, and a blasting unit that blasts the air obliquely downward to the front surface side of the second medium from the downstream side to the upstream side in the medium feeding direction and that has a blasting angle of the air with respect to the medium feeding direction larger than a supply angle of the air of the separating unit.