Mechanism, assembly and sheet material dispenser for manually actuating rotation of a roller
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Solution Overview
Problem
Conventional sheet material dispensers face issues with premature component failure due to abrupt transitions in resistive forces during user interaction, leading to maintenance challenges and potential breakage of internal parts.
Innovation Solution
A mechanism with a movable rotation axis and urging members that smoothly transition between transmission and non-transmission states, preventing excessive force from causing component disconnection, thereby reducing the risk of early failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a protective arrangement is provided to isolate sensitive components from excessive user forces, then component strength is improved, but the device complexity increases
Solution Approach 1:
The rotation axis is made movable between a first position (connecting driver and driven members) and a second position (disconnecting them). This dynamic reconfiguration allows the mechanism to automatically protect sensitive components from excessive forces by disengaging the power transmission path when needed, without requiring complex protective structures.
Solution Approach 2:
The rotation axis acts as an intermediary element between the actuating member and the driven member. By making this intermediary movable, it can mediate the force transmission and disconnect the driver from the driven member when excessive forces are applied, thereby protecting sensitive components while maintaining a relatively simple overall structure.
2Reliability
If the rotation axis is made movable to disconnect driver and driven members, then reliability is improved, but the device complexity increases
Solution Approach 1:
The rotation axis transitions from a fixed position to a movable one, enabling automatic disconnection between the driver and driven members. This dynamic capability significantly improves reliability by preventing component failure under excessive loads, while the movement mechanism remains relatively simple, involving basic mechanical elements rather than complex control systems.
Solution Approach 2:
The mechanism automatically protects itself from damage through the movable rotation axis. When excessive forces are applied, the rotation axis naturally moves to the second position, disconnecting the power transmission and preventing component failure. This self-protecting feature enhances reliability without requiring external control systems or complex monitoring mechanisms.
3Ease of operation
If urging members are added to control rotation axis position, then ease of operation is improved, but the device complexity increases
Solution Approach 1:
Urging members (such as springs) are introduced to provide counter-forces that control the position of the rotation axis. These urging members ensure the axis returns to the first position after disconnection and maintain proper engagement during normal operation. The addition of these relatively simple mechanical elements significantly improves ease of operation by providing controlled, predictable behavior, while the complexity increase remains minimal.
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 mechanism enhances dispenser durability and reliability by smoothing transitions between user force states, reducing the risk of component failure and allowing safe manual actuation of the roller for sheet material dispensing.
Implementation Method 1
a first urging member configured to urge the rotation axis in the first position
Data Source
AI summary
A mechanism is provided for manually actuating rotation of a roller of a sheet material dispenser for dispensing a predetermined length of sheet material. The mechanism includes a frame member; a driven member configured for coupling with the roller; an actuating member configured to rotate about a rotation axis in a first direction through manual actuation by a user; and a driver member coupled with the actuating member. The rotation axis is movably mounted on the frame member to be movable between a first position allowing rotation of the roller caused by rotation of the actuating member in the first direction, and a second position preventing rotation of the roller caused by rotation of the actuating member in the first direction. The mechanism includes a first urging member configured to urge the rotation axis in the first position. A related assembly and dispenser including the mechanism are also provided.