Paper Roll Dispenser Release Mechanism to Prevent Double Dispensing
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Solution Overview
Problem
Existing paper dispensers often require user intervention for roll changes and can result in double dispensing of paper due to premature activation of the reserve roll, especially when handling printed paper, which complicates the insertion and visibility of printed sides.
Innovation Solution
A dispenser design featuring a rotatably mounted blocking mechanism kinematically coupled with a pivoting scanning element, where the scanning element is arranged to rub against the paper roll, ensuring accurate detection of roll diameter and automatic release of the blocking mechanism without user intervention, allowing for seamless roll changes and accommodating printed paper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the blocking means is released early to allow reserve roll insertion, then the dispenser can accommodate printed paper with visible printed side, but double dispensing of paper occurs
Solution Approach 1:
The blocking means is designed to be dynamically positioned at different stages: initially blocking the guide track to prevent premature reserve roll insertion, then automatically retracting only after the sensing element confirms complete paper exhaustion. This dynamic timing prevents double dispensing while allowing printed paper handling capability.
Solution Approach 2:
The sensing element provides feedback about the paper roll diameter to control the timing of blocking means release. The system continuously monitors the dispenser roll diameter and only releases the blocking means when the sensing element detects that the paper is completely used up, ensuring accurate timing and preventing premature reserve roll insertion.
2Measurement precision
If the scanning element is mounted to pivot freely, then it can detect roll diameter changes, but it cannot properly detect printed paper orientation
Solution Approach 1:
The detection system is segmented into two independent functions: the scanning element pivots to detect roll diameter changes, while the blocking means position and sensing element alignment detect printed paper orientation. This segmentation allows each element to specialize in one detection task without compromising the other.
Solution Approach 2:
The blocking means serves as an intermediary element that provides a reference position for detecting printed paper orientation. When the blocking means is in its retracted position, it indicates that the paper is completely used up and the printed side is properly oriented, allowing the system to detect both diameter changes and print orientation simultaneously.
3Reliability
If the blocking means is held fixed during roll change, then roll insertion is prevented, but automatic roll change without user intervention fails
Solution Approach 1:
The blocking means is designed to be self-actuating through the paper exhaustion detection mechanism. When the sensing element detects that the dispenser roll diameter has decreased to a predetermined threshold (indicating complete paper usage), the blocking means automatically retracts without requiring user intervention, enabling automatic roll changes while maintaining reliable insertion control.
Solution Approach 2:
The blocking means is preliminarily positioned to block the guide track before paper exhaustion occurs. This preliminary blocking action ensures that reserve rolls cannot be inserted prematurely, and the system maintains this blocking state until the sensing element confirms complete paper usage, at which point the blocking means automatically retracts to allow roll change.
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
Enables automatic roll changes without user cooperation, preventing double dispensing and ensuring easy handling of printed paper by ensuring the printed side is visible, thus optimizing paper usage and user experience.
Implementation Method 1
a waiting position defined by a blocking means is provided for a reserve roll falling into the dispensing position under the influence of gravity
Implementation Method 2
a sensing element acted upon against the peripheral surface of the dispenser roll
Data Source
Figure 1~4
Figure 5~8
AI summary
Dispenser for paper from a dispenser roll (10) lying in a lower dispensing position, with a guide track (6) leading from above into the dispensing position, in which a waiting position for a reserve roll (20) defined by a blocking means (7) is provided, with a Means for detecting the diameter of the dispenser roll (10) and having means for releasing the locking means for the reserve roll (20) after the paper of the dispenser roll (10) has been used up, the means for detecting the diameter of the dispenser roll (10) pressing against the peripheral surface the dispenser roll (10) has a scanning element (11) which can be displaced by the falling reserve roll (20) and returns to the scanning position after the fall of the reserve roll.