Dispenser Roll Lock Mechanism for Authorized End Plug Insertion
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Solution Overview
Problem
Existing dispensers for paper rolls face challenges in ensuring easy and correct insertion of replacement rolls while preventing the use of unauthorized or improperly sized rolls, which can lead to incorrect operation or user safety issues.
Innovation Solution
A lock mechanism with a guide slot of varying widths and a sliding element that uses a key-lock-system, where the end plug's bearing pin with specific diameter portions interacts with the guide slot and a lock element to ensure proper alignment and prevent incorrect rolls, combined with an end plug design that includes radially extending ribs and a flange-shaped stop for secure fitment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a key-lock system with varying guide slot widths is used to prevent unauthorized rolls, then security against unauthorized rolls is improved, but the complexity of the insertion mechanism increases
Solution Approach 1:
The guide slot is divided into multiple sections with different widths (first section with larger width, second section with smaller width). The bearing pin is correspondingly segmented into diameter portions that interact with different sections. This segmentation allows the mechanism to provide both security (by requiring precise geometric matching) and ease of operation (by guiding the insertion through defined paths).
Solution Approach 2:
The bearing pin acts as an intermediary element between the end plug and the guide slot. Its specific geometry with different diameter portions mediates the interaction, allowing authorized rolls to be easily inserted while preventing unauthorized ones. The lock element and sliding element also serve as intermediaries that translate the geometric matching into a secure locked state.
2Manufacturing precision
If a lock element with multiple diameter portions is used to ensure proper alignment, then the precision of roll placement is improved, but the difficulty of insertion increases
Solution Approach 1:
The guide slot is pre-configured with varying widths and the lock element is pre-positioned to engage at specific points during insertion. The first diameter portion of the bearing pin interacts with the first section of the guide slot to preliminarily guide and align the roll, while the second diameter portion interacts with the second section to finalize the precise placement. This preliminary action sequence ensures precision without making insertion difficult.
3Reliability
If a sliding element is added to control the lock element movement, then the reliability of the locking mechanism is improved, but the device complexity increases
Solution Approach 1:
The sliding element and lock element are combined into an integrated assembly where the sliding element controls the movement of the lock element. This merging reduces the number of independent components while maintaining the reliability of the locking mechanism. The varying widths of the guide slot sections work together with this combined element to ensure proper engagement and locking.
Data Source
AI summary
A lock mechanism for a dispenser in combination with an exchangeable roll of material is provided, wherein the roll includes at least one end plug with a bearing pin for mounting the roll to the lock mechanism. The lock mechanism comprises a lock housing with a guide slot for insertion of the bearing pin. The guide slot has a first section with a first width and a second section with a second width which is smaller than the first width. First and second sections are arranged in a direction perpendicular to the longitudinal extension of the guide slot and in a longitudinal direction of the bearing pin. A sliding element is mounted to the lock housing and movable between a first position closing or narrowing the width of the guide slot and a second position opening the guide slot. A lock element is mounted to the sliding element and is rotationally movable about an axis of rotation between a locked position and an unlocked position. The lock element has an engagement portion which, in a locked position, is engaged with a locking geometry of the lock housing.