Support spindle assembly for a roll
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Solution Overview
Problem
Dispensing from coreless paper rolls without a rotational brake mechanism often results in overspinning, leading to paper waste and accessibility issues, as the braking force is dependent on friction which is difficult to control.
Innovation Solution
A support spindle assembly with a rotatable sleeve and a resilient member that provides rotational resistance by exerting an axial force, preventing free-wheeling of the coreless paper roll during dispensing, utilizing a compression spring and bushing for controlled friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tab assembly utilizing friction between the spindle member and the center of the coreless roll is used, then the braking force is entirely dependent on friction, but it becomes difficult to anticipate or control the braking force exerted on the roll
Solution Approach 1:
The invention changes the friction parameter from an uncontrollable variable to a controlled variable by introducing a resilient member (spring) that applies a predetermined axial load. This transforms the braking force from being entirely friction-dependent to being controlled by the spring force, making it predictable and reliable.
Solution Approach 2:
The resilient member acts as an intermediary between the spindle member and the rotatable sleeve, mediating the force transmission. Instead of direct friction contact between the spindle and roll center, the spring provides a controlled intermediate force that ensures predictable braking action.
2Ease of operation
If no rotational brake mechanism is used, then the roll can spin freely during dispensing, but this results in overspinning and paper waste
Solution Approach 1:
The invention converts the potentially harmful effect of friction (which was previously uncontrollable and caused unpredictable braking) into a beneficial controlled braking force. By using the resilient member to apply a predetermined axial load, the friction between the rotatable sleeve and spindle element becomes a useful, controllable braking mechanism that prevents overspinning while allowing smooth dispensing.
3Reliability
If a resilient member is introduced to provide rotational resistance, then controlled braking force is achieved, but the device complexity increases
Solution Approach 1:
The invention changes the state of the spindle element from a purely passive rotational support to an active braking mechanism by introducing a resilient member. This single component addition transforms the system's behavior by providing controlled axial load, thereby achieving reliable braking force control without requiring multiple complex components.
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 prevents overspinning by providing a predictable braking force, reducing paper waste and ensuring the leading tail of the paper remains accessible, enhancing user convenience and environmental sustainability.
Implementation Method 1
The resilient member is arranged to cooperate with the spindle base and with the rotatable sleeve in order to provide the rotatable sleeve with rotational resistance. The resilient member exerts an axial force directly or indirectly on the rotatable sleeve, which gives rise to rotational resistance caused by friction.
Implementation Method 2
A support spindle assembly with a rotatable sleeve and a resilient member that provides rotational resistance by exerting an axial force, preventing free-wheeling of the coreless paper roll during dispensing, utilizing a compression spring and bushing for controlled friction.
Data Source
AI summary
A support spindle assembly for rotatably supporting a coreless paper roll for dispensing, the support spindle assembly including a spindle base, a spindle element having a central longitudinal axis (X) and having first and second ends, the spindle element being attached to the spindle base at the first end and rotationally fixed in relation to the spindle base and a rotatable sleeve rotatably disposed about the spindle element, and rotatable in relation to the spindle base and to the spindle element. The support spindle assembly includes a resilient member disposed about the first end of the spindle element, which resilient member is arranged to cooperate with the spindle base and with the rotatable sleeve in order to provide the rotatable sleeve with a rotational resistance.