Spring-Driven Towel Dispenser with Tear-Triggered Indexing Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing dispensers for sheet materials like paper towels and toilet tissue are costly due to complex mechanisms and motorized parts, leading to increased maintenance and repair needs, and often require users to manually handle excessive product, which is wasteful and costly for facilities.
Innovation Solution
A dispenser design featuring a drive roller, indexing mechanism, and extension spring that allows for automatic dispensing of a selected sheet size, enabling hands-free operation and reducing costs by eliminating the need for automated components, with a stop release mechanism that stores energy to dispense a portion of sheet material after each use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If motorized parts and sensors are used for automatic dispensing, then dispensing automation is improved, but device complexity and cost increase
Solution Approach 1:
The system uses the user's own tearing action to trigger the dispensing mechanism. When the user tears the sheet material, this action directly releases the stop member, which then allows the spring to automatically dispense the next portion of material. The system serves itself by converting the user's necessary action (tearing) into the trigger for automatic replenishment.
Solution Approach 2:
The spring is pre-loaded and stored energy is prepared in advance during the dispensing cycle. The stop member is pre-positioned to block the indexing mechanism, and the spring is compressed ready to release. When triggered by the tearing action, the pre-stored energy immediately dispenses the next portion without requiring additional power or complex control systems.
2Extent of automation
If motorized parts and sensors are used for automatic dispensing, then dispensing automation is improved, but maintenance requirements increase
Solution Approach 1:
The system replaces expensive, complex motorized components with simple, inexpensive mechanical elements. The spring, stop member, and indexing mechanism are basic mechanical parts that are inexpensive to replace. Even if these components wear out or break, they can be quickly replaced by maintenance personnel without requiring specialized knowledge or tools, significantly reducing maintenance time and cost.
3Ease of operation
If numerous internal components are used in the dispenser, then dispensing functionality is improved, but reliability decreases
Solution Approach 1:
The patent removes the complex motorized parts and sensors from the system, extracting only the essential mechanical components needed for dispensing. The solution uses a minimal set of parts: a spring for energy storage, a stop member for controlling the indexing mechanism, and a simple tear-triggered release system. This reduction in component count directly improves reliability by eliminating potential failure points.
Solution Approach 2:
The dispensing mechanism is segmented into simple, independent functional elements: the indexing mechanism that measures dispensing amount, the stop member that controls the cycle, the spring that provides energy, and the tear-trigger that initiates replenishment. Each segment is simple and can be independently replaced if needed, improving overall system reliability through modularity and simplicity.
4Ease of operation
If non-restrictive manual dispensers are used, then ease of operation is improved, but product waste increases
Solution Approach 1:
The system changes the parameter of dispensing control from completely manual (user-determined amount) to mechanically controlled (fixed predetermined amount). The indexing mechanism ensures that each dispensing cycle releases a specific, pre-determined length of material, preventing users from taking excessive amounts while still allowing easy access. The spring-loaded mechanism automatically dispenses the correct portion without requiring user judgment or manual measurement.
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 dispenser provides a cost-effective, functional solution that reduces maintenance and waste by automatically dispensing a portion of sheet material with each use, ensuring continuous access without the need for complex motorized parts, thus lowering operational costs and improving user convenience.
Implementation Method 1
an extension spring configured to the indexing mechanism such that upon the user tearing the selected sized sheet of material, the dispenser is capable of dispensing a portion of sheet material
Data Source
AI summary
A dispenser for sheet materials is disclosed. The dispenser includes indexing mechanism and stop release member for dispensing a selected size of sheet material. The indexing mechanism includes an extension spring for dispensing a tail of sheet material from the dispenser. In embodiments, the dispenser includes a drive roller capable of rotating the indexing mechanism when a user removes the sheet material from the dispenser. The drive roller is prevented from rotating when the stop member engages stop release member.