Paper Towel Dispenser Handle Linkage for Reliable Switch Actuation
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Solution Overview
Problem
Existing paper towel dispensers lack an efficient and reliable control mechanism for the electric motor driving the rotatable toweling support roller, particularly in switching between operational modes and ensuring proper actuation of mechanical switches during rotation.
Innovation Solution
A control apparatus with a handle system connected to the rotatable paper toweling support drum, which rotates to open and close control switches, allowing for precise control of the dispenser's functions, including mode selection, delay, and sensitivity settings, thereby eliminating the need for expensive manufacturing techniques and ensuring proper switch actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical electrical switch system with a cam-like interior surface is used to control the electric motor, then the switch actuation mechanism is established, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent replaces the complex cam-like mechanical switch actuation system with a simpler mechanical linkage system consisting of a lever arm and pivot point. The lever arm rotates about the pivot point to directly actuate the electrical switch, eliminating the need for complex cam surfaces and reducing manufacturing complexity while maintaining reliable switch actuation.
2Adaptability or versatility
If manually actuated slidable mode control switches are used to change operational modes, then mode selection capability is provided, but the device complexity increases
Solution Approach 1:
The patent combines the mode selection function with the existing mechanical control structure by integrating mode control switches into the lever arm assembly. The lever arm system serves dual purposes: actuating the electrical switch for motor control and selecting operational modes, thereby reducing overall device complexity while maintaining versatility.
Solution Approach 2:
The lever arm mechanism is designed to perform multiple functions: it acts as both the actuator for the electrical switch and the selector for different operational modes. This multi-functional design reduces the number of separate components needed and simplifies the overall control system while providing adaptability across different operating modes.
3Device complexity
If the control switch is positioned close to the rotatable paper toweling support drum, then the control mechanism is compact, but proper switch actuation during rotation becomes difficult
Solution Approach 1:
The patent positions the electrical switch and lever arm actuation mechanism asymmetrically relative to the rotating drum, placing them at strategic locations where the lever arm can effectively engage and disengage during rotation. This asymmetric positioning ensures reliable switch actuation at specific rotational positions while maintaining a compact overall design.
Solution Approach 2:
The lever arm is pre-positioned and biased to engage the switch at the appropriate moment during the drum's rotation cycle. The mechanical linkage is designed so that the lever arm naturally contacts the switch before the drum completes its rotation, ensuring timely and accurate actuation without requiring complex timing mechanisms.
Data Source
AI summary
Control apparatus for controlling operation of a paper towel dispenser includes control switches and a handle having two relatively movable handle portions rotating when a paper toweling support drum rotates. One of the handle portions has projections which engage the switches when the handle rotates.