Sheet Cassette Rib Oscillation Suppression
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Solution Overview
Problem
Conventional sheet feeding mechanisms in image forming apparatuses experience abnormal noise due to stickslip phenomena, which cause minute oscillations and affect the stability of sheet feeding, as existing solutions like oscillating spindles or rubber absorbing materials compromise the mutual suppress strength between feeding rollers and separating pads.
Innovation Solution
A sheet loading device with a rib formed on the rear surface of the sheet cassette, pressed by a pressing member, which reduces oscillations by curbing the deformation of the rib prone to oscillations and delays the intrinsic oscillation frequency of the sheet cassette, preventing resonance and maintaining stable sheet feeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an oscillating spindle is attached to the feeding roller holder to reduce oscillations, then noise is reduced, but the mutual suppress strength between the feeding roller and separating pad is affected, compromising sheet feeding stability
Solution Approach 1:
The bottom plate is segmented by adding a rib structure that divides the plate into separate regions. This segmentation allows the rib to act as an independent oscillation-absorbing element while maintaining the structural integrity and sheet feeding function of the overall bottom plate.
Solution Approach 2:
The oscillation suppression function is added in a new dimension by extending the bottom plate structure vertically with a rib. This rib protrudes from the bottom surface of the sheet cassette, creating a three-dimensional structure that absorbs oscillations without interfering with the two-dimensional sheet feeding path between the feeding roller and separating pad.
2Object-affected harmful factors
If rubber oscillation absorbing material is arranged between the sheet loading plate and spring, then oscillations are reduced, but the mutual suppress strength between the sheet loading plate and feeding roller is affected, hampering stable sheet feeding
Solution Approach 1:
The bottom plate is segmented by adding a rib structure that divides the plate into separate regions. This segmentation allows the rib to act as an independent oscillation-absorbing element while maintaining the structural integrity and sheet feeding function of the overall bottom plate.
Solution Approach 2:
Instead of using expensive rubber oscillation absorbing material that may degrade over time, the invention uses a simple rib structure made of the same material as the bottom plate. This rib structure provides durable, long-term oscillation suppression without the degradation issues associated with elastic materials.
3Object-affected harmful factors
If the sheet cassette structure is modified to reduce oscillations, then noise is reduced, but the structural complexity of the sheet cassette increases
Solution Approach 1:
The bottom plate is segmented by adding a rib structure that divides the plate into separate regions. This segmentation allows the rib to act as an independent oscillation-absorbing element while maintaining the structural integrity and sheet feeding function of the overall bottom plate.
Solution Approach 2:
The rib structure serves multiple functions: it reinforces the bottom plate structure, provides oscillation absorption, and maintains the overall structural integrity of the sheet cassette. This multi-functionality reduces the need for additional separate components.
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 oscillations and noise in the sheet cassette while maintaining stable sheet feeding performance by curbing rib oscillations and delaying intrinsic oscillation frequencies, ensuring smooth operation without compromising sheet feeding stability.
Implementation Method 1
a rib 26 that is formed on a rear surface of a bottom plate 27 of the sheet cassette 19
Implementation Method 2
which is pressed by a pressing member 30
Implementation Method 3
The feeding roller and a separating pad, which is arranged opposite the feeding roller, separate each single sheet and transmit the sheet
Implementation Method 4
during transmission of the sheet, the sheet causes a stickslip on the separating pad
Data Source
AI summary
A sheet cassette loads and houses therein a plurality of sheets. A separating unit separates the sheets loaded in the sheet cassette one by one. The separating unit is arranged in the sheet cassette in opposite to a feeding roller that conveys the sheets from the sheet cassette. A rib is formed on a rear surface of a bottom plate of the sheet cassette. The rib is pressed by a pressing member.