Rolled product dispenser
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Solution Overview
Problem
Existing rolled product dispensers often result in an inappropriate length of the product tail due to overspinning of the dispensing roller, leading to bacterial contamination and product waste, and can be damaged by incorrect rotation of the turn knob.
Innovation Solution
A rolled product dispenser with a rotating drum assembly that includes a return mechanism to bias the drum back to a stationary configuration and a blocking mechanism with radially protruding teeth to prevent rotation beyond a predetermined angular position, controlling the length of the product tail.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the dispensing roller is allowed to rotate freely in both directions, then the turn knob can be manually rotated to rotate the drum in either direction for new roll installation or tear correction, but the roller may overspin in the wrong direction causing product web to unthread or mechanism damage
Solution Approach 1:
The system dynamically changes the rotational characteristics of the drum based on operational needs. During normal dispensing, the drum rotates freely in the dispensing direction. During manual operation, the one-way clutch engages to allow bidirectional rotation. The blocking mechanism dynamically prevents rotation beyond predetermined angular positions, providing adaptive control that resolves the contradiction between versatility and reliability.
Solution Approach 2:
The one-way clutch bearing acts as an intermediary between the turn knob and the dispensing roller. It mediates the rotational force, allowing the turn knob to rotate the drum in both directions during manual operation, while preventing the drum from rotating in the wrong direction during automatic dispensing, thus protecting the mechanism from damage.
2Productivity
If the dispensing roller rotates without restriction, then dispensing operation is simple and quick, but the tail length becomes inappropriate leading to bacterial contamination and product waste
Solution Approach 1:
The blocking mechanism with stoppers is pre-configured at predetermined angular positions to automatically limit the rotation of the dispensing roller. This preliminary action ensures that the tail length is controlled before excessive rotation can occur, preventing bacterial contamination and product waste while maintaining simple and quick dispensing operation.
Solution Approach 2:
The blocking mechanism provides mechanical feedback by engaging the stoppers at predetermined angular positions during drum rotation. This feedback automatically limits the tail length to appropriate dimensions, preventing overspinning that would lead to contamination and waste, while allowing rapid dispensing operation to continue.
3Reliability
If a one-way clutch is used to prevent wrong direction rotation, then mechanism damage is prevented, but the device complexity increases
Solution Approach 1:
The one-way clutch bearing is implemented as a simple, inexpensive mechanical component that provides reliable protection against mechanism damage. While it does increase device complexity slightly, the clutch is designed to be a maintenance-free, long-lasting component that prevents costly damage to the dispensing mechanism, making the added complexity worthwhile.
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 solution effectively reduces the length of the product tail to a consistent, manageable length between pulls, minimizing waste and contamination while preventing damage to the dispenser, and reducing noise through limited tooth engagement.
Implementation Method 1
a return mechanism biasing the rotating drum assembly towards a stationary configuration by rotating same in the counter dispensing rotation direction
Implementation Method 2
a blocking mechanism allowing rotation of the rotating drum assembly in the dispensing rotation direction and preventing rotation of the rotating drum assembly in the counter dispensing rotation direction beyond at least one predetermined angular position
Data Source
AI summary
A rolled product dispenser for dispensing a web of rolled product is described. The rolled product dispenser comprises a dispensing assembly, a return mechanism, and a blocking mechanism. The dispensing assembly includes a rotating drum assembly having a peripheral wall configured to be contoured at least partially by the web of rolled product. The rotating drum assembly is rotatable in a dispensing rotation direction and a counter dispensing rotation direction along at least 90 degrees. The return mechanism biases the rotating drum towards a stationary configuration by rotating same in the counter dispensing rotation direction. The blocking mechanism is engageable with the rotating drum assembly to prevent rotation thereof in the counter dispensing rotation direction beyond at least one predetermined angular position.