Paper Sheet Accumulation Drum with Retractable Members
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Solution Overview
Problem
In drum-type paper sheet accumulation devices, the increasing number of stacked banknotes leads to a misalignment issue due to varying thickness and crease differences, making high-accuracy speed control of the drum peripheral speed extremely difficult, as the outer diameter and peripheral speed increase, causing timing deviations between leading and following banknotes.
Innovation Solution
A paper sheet accumulation drum with retractable members on its outer surface, where the retractable members are elastically biased to protrude and retract inward uniformly, maintaining a constant outer radial position and peripheral speed regardless of the number of stacked banknotes, allowing for continuous alignment without complex speed control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If paper sheets are stacked on a cylindrical drum with constant outer circumferential length, then the drum can accumulate paper sheets, but the outer diameter increases with the number of stacked sheets, causing peripheral speed to increase and leading to misalignment
Solution Approach 1:
The patent applies the dynamics principle by making the drum's outer diameter variable rather than fixed. The drum is designed to expand radially as paper sheets are stacked, allowing the outer diameter to dynamically increase with the number of sheets. This dynamic adjustment maintains constant peripheral speed despite changing stack height, preventing misalignment while enabling continuous accumulation of paper sheets.
2Manufacturing precision
If the peripheral speed of the drum is decelerated to maintain alignment, then timing coincidence can be maintained, but high-accuracy speed control becomes extremely difficult due to varying thickness and crease differences
Solution Approach 1:
The patent applies parameter changes by modifying the drum's geometric parameter (outer diameter) to compensate for variations in paper sheet thickness and crease differences. Instead of controlling speed variations, the system changes the drum's radial dimension to maintain constant peripheral speed. This approach eliminates the need for complex speed control programs while ensuring precise timing coincidence of paper sheet leading ends.
3Quantity of substance
If the outer diameter of the drum increases with stacked banknotes, then more banknotes can be accumulated, but the peripheral speed of the outermost banknote increases, causing misalignment
Solution Approach 1:
The patent applies dynamics by designing a drum that dynamically adjusts its outer diameter based on the number of accumulated paper sheets. As sheets are stacked, the drum radially expands to accommodate the increased quantity while maintaining constant peripheral speed. This dynamic geometric adjustment allows unlimited accumulation capacity without speed-induced misalignment.
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 ensures constant linear velocity and alignment of paper sheets on the drum's outermost circumference, preventing misalignment and simplifying speed control, enabling efficient and accurate stacking and discharge of paper sheets without the need for precise speed adjustments.
Implementation Method 1
the retractable members are elastically biased to protrude and retract inward uniformly, maintaining a constant outer radial position
Data Source
Figure 1(a)
Figure 1(b)
Figure 2(a)
AI summary
In a drum-type paper sheet accumulation device that sequentially supplies paper sheets to an outer circumferential surface of a payout drum, accumulates the paper sheets by winding the paper sheets in a stacked state, and returns the paper sheets all at once, a technique is provided which can keep a linear velocity of a paper sheet located at an outermost circumference of the payout drum constant and can maintain an arranged state of the paper sheets without any particular speed control. A paper sheet accumulation drum 105 that stacks and accumulates paper sheets supplied one by one on an outer circumferential surface thereof while rotating, includes a plurality of retractable members 280 that are arranged on a paper sheet accumulation portion of the outer circumferential surface in a predetermined circumferential arrangement, are configured to be retractable between a most protruding position protruding radially outward and a retreat position retreating from the most protruding position radially inward, are each elastically biased in a protruding direction, and each come into contact with a paper sheet surface on an outer surface. The paper sheets are accumulated to spread over the retractable members.