Dispenser Locking Roller Mechanism for Tape Free End Control
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Solution Overview
Problem
Existing dispensers for length materials, such as adhesive tape, textile ribbons, and metallic wires, face challenges in preventing the free end from rolling back onto the reel, especially with materials that are springy or limp, leading to unwinding issues and creasing.
Innovation Solution
A dispenser with rotatable locking members and a movable frame that isolates the free end of the material, allowing for temporary locking and easy one-handed operation, featuring a spring-loaded mount and rollers with low friction coatings to prevent unwinding and tearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the free end of the length material is left loose for easy dispensing, then the ease of operation is improved, but the material may roll back onto the reel causing unwinding and loosening
Solution Approach 1:
A guide roller is introduced as an intermediary component between the free end of the material and the dispensing surface. The guide roller supports and directs the free end, preventing it from rolling back onto the reel while allowing controlled dispensing. This mediator resolves the contradiction by providing both stability and ease of operation.
2Reliability
If a locking mechanism is added to prevent roll back, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The dispenser utilizes the user's own hand as a self-service locking mechanism. When the user grasps the free end of the material to dispense it, the natural gripping action provides sufficient friction and control to prevent roll-back without requiring additional mechanical locking components. This eliminates device complexity while maintaining reliability.
3Reliability
If pressure is applied to prevent unwinding of springy materials, then the reliability is improved, but the material may tear or break
Solution Approach 1:
The guide roller provides a counterbalancing support force that opposes the springiness of the material without requiring excessive clamping pressure. By positioning the guide roller to support the free end at an optimal location, the system balances the material's elastic tendency to unwind with gentle guidance, preventing both unwinding and material damage.
4Ease of operation
If the dispenser is designed for one-handed operation, then the ease of operation is improved, but the control precision may be reduced
Solution Approach 1:
The function of precise control is extracted from the user's hand and assigned to the guide roller and dispensing surface. These fixed components provide stable geometric constraints that ensure precise material positioning and cutting, while the user's hand only needs to perform the simple task of grasping and dispensing, maintaining one-handed operation without sacrificing precision.
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
Effectively prevents the free end from rolling back onto the reel, allows for easy cutting and dispensing of materials, and reduces the risk of tearing or breaking, while enabling versatile use with various types of length materials.
Implementation Method 1
a first locking member defining a first axis and being radially biased towards the surface by a biasing member
Implementation Method 2
rollers with low friction coatings to prevent unwinding and tearing
Data Source
Figure 1
Figure 2~3
Figure 4~4a
AI summary
A dispenser (1) for length material (2) comprises a first resiliency biased locking roller (10) and a second locking roller (30) defining a nip (32) therebetween for the passage of length material (2) to be dispensed, the second roller (30) being carried on a frame (22) which upon appropriate movement causes the second roller (30) to move into a locking position in relation to the first locking roller (10) to clamp the length material (2) to prevent unreeling or return of the free end (34) thereto once appropriate cutting of a portion of the length material (2) has been effected.