Pivot Member Encoder for Double-Fed Paper Detection
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Solution Overview
Problem
Paper handling machines, such as ATMs and printers, experience jams and errors due to double-fed currency notes, leading to efficiency deterioration and potential banking accidents when sheets are not properly separated.
Innovation Solution
An apparatus with a pivot member and encoder portion is used to detect double-fed paper by amplifying the minute shift caused by contact with the paper, allowing a sensor to count slits and prevent jams and errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a paper handling machine uses a simple feeding mechanism, then the device complexity is reduced, but the reliability deteriorates due to inability to detect double-fed paper
Solution Approach 1:
The pivot member acts as an intermediary mechanical element that translates the subtle presence of multiple paper sheets into a measurable rotational displacement. When paper contacts the pivot member, it causes rotation around the rotary shaft, which is then detected by the sensor system, enabling indirect detection of double-fed paper without complex direct sensing mechanisms
Solution Approach 2:
The invention replaces complex mechanical detection mechanisms with a sensor-based detection system. The encoder portion with slits and the optical sensor substitute for traditional mechanical switches or complex linkages, using optical field interaction to detect the rotational position and determine whether double-fed paper occurred
2Measurement precision
If the rotary shaft is positioned closer to the encoder portion, then the measurement precision is improved, but the stability of the pivot member deteriorates
Solution Approach 1:
The invention addresses the stability-precision trade-off by moving the detection mechanism to a different spatial dimension. The encoder portion with its slit pattern creates an optical measurement field perpendicular to the pivot member's rotation plane, allowing precise angular measurement without compromising the mechanical stability of the pivot assembly in its original configuration
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
Accurately detects double-fed paper, preventing jams and banking accidents, and ensuring machine efficiency by reliably identifying overlapped sheets in various paper handling machines.
Implementation Method 1
amplifying a minute shift amount of the pivot member using an encoder portion of the pivot member
Data Source
AI summary
Disclosed are an apparatus and method for detecting double-feed of paper to prevent banking accidents or jam in a paper handling machine for handling paper, sheets of currency note are not separated by a sheet separating means and thus plural sheets are double fed. The apparatus includes paper feeding means for guiding upper and lower surfaces of the paper and feeding the paper, a pivot member pivotally installed to a rotary shaft, and having a contact portion disposed in a paper feeding path of the paper feeding means and contacting with one surface of the feeding paper, and an encoder portion with a plurality of slits, in which the rotary shaft is closer to the contact portion rather than the encoder portion, and a sensor for counting the number of slits of the encoder portion when the pivot member pivots. The present invention can accurately detect the overlay of the paper having a thin thickness with a simple construction. Also, the present invention can detect the overlay of the paper, regardless of a size and thickness of the paper and a transferring direction of the paper.