Paper Sheet Separating Device Using Negative Pressure and Torque
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Solution Overview
Problem
Conventional paper sheet separating and take-out devices face challenges in maintaining performance over time and throughput due to wear of rubber rollers, jamming issues with thick and thin sheets, and degradation of separating ability when handling multiple overlapped sheets.
Innovation Solution
A paper sheet separating and take-out device incorporating a deposit section, a supply mechanism, a take-out mechanism, and a separating mechanism that applies negative pressure and separating torque to securely separate sheets, with an auxiliary mechanism for controlling the take-out and separation process, including metal rollers for extended life and improved throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rubber rollers are used to increase friction coefficient for better separating performance, then separating ability is improved, but roller life is noticeably shortened due to wear and abrasion
Solution Approach 1:
The patent replaces the expensive, long-lasting metal roller with a cheaper, shorter-lived rubber roller that can be easily replaced. The rubber roller provides sufficient separating performance through its friction coefficient, and when it wears out, it can be quickly swapped without replacing the entire roller assembly, thus resolving the contradiction between maintaining separating performance and extending operational life.
Solution Approach 2:
The patent changes the surface properties of the roller by using rubber material with a high friction coefficient instead of metal. This parameter change in surface material and friction characteristics enables effective separation of paper sheets while the roller can be replaced when worn, addressing both the need for good separating performance and the acceptance of limited service life.
2Productivity
If take-out speed of paper sheets is heightened to improve throughput, then productivity is improved, but abrasion of rubber rollers progresses faster, shortening their life
Solution Approach 1:
The system is designed to operate at high speeds to maximize throughput, accepting that the rubber rollers will wear faster. The rollers are made replaceable and relatively inexpensive, so they can be frequently replaced without significantly impacting overall system productivity. This resolves the contradiction by prioritizing throughput while managing roller life through easy replacement.
3Reliability
If separating rollers are arranged fixedly to apply consistent separating force, then separating performance is maintained, but jamming occurs when handling both thick and thin sheets
Solution Approach 1:
The patent introduces a movable belt that can dynamically adjust its position and contact pressure with the paper sheets. Instead of fixed separating rollers, the belt can move to accommodate variations in sheet thickness, applying appropriate separating force adaptively. This dynamic adjustment capability resolves the contradiction between maintaining consistent separating performance and handling diverse sheet thicknesses without jamming.
4Reliability
If multiple separating mechanisms are arranged along the take-out direction to handle overlapped sheets, then separating ability for multiple sheets is improved, but device complexity increases
Solution Approach 1:
The patent designs a single movable belt that performs multiple separating functions by adjusting its position and movement characteristics. Instead of installing multiple separate separating mechanisms, the universal belt can handle different numbers of overlapped sheets by modifying its operation, thus resolving the contradiction between improving separating ability for overlapped sheets and avoiding increased device complexity.
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 device effectively maintains performance and throughput by securely separating overlapped sheets without jamming, extending the life of rollers, and enhancing processing speed and efficiency.
Implementation Method 1
applies a negative pressure to the paper sheet to be taken out onto the conveyance path
Implementation Method 2
The separating roller applies a separating torque which directs towards a direction opposite to the take-out direction to second and subsequent paper sheets on the side of the separating roller. As a result, the second and subsequent paper sheets are braked so as to be separated from the first paper sheet.
Data Source
AI summary
A take-out device includes a take-out mechanism which takes out postal matters supplied to a take-out position at one end of a deposit section one by one, a separating mechanism which separates second and subsequent postal matters that are carried along with a postal matter to be taken out from the take-out position, and an auxiliary mechanism which applies a negative pressure to the postal matter on the take-out position so as to feed it in both forward and opposite directions. The separating mechanism applies a negative pressure to the postal matter on the conveyance path via a plurality of adsorption holes of a separating roller so as to adsorb it, and applies a separating torque in an opposite direction to the take-out direction thereto.