Drum Conveyance Mechanism Emergency Stop via Rotation Brake
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Solution Overview
Problem
Existing drum conveyance mechanisms in image forming apparatuses face challenges in instantly stopping the rotation of the conveying drum due to residual electric charge and inertia, leading to continued undesired rotation even after initiating an emergency shut-down, which complicates immediate termination.
Innovation Solution
Incorporating a second power supply to drive a rotation brake that prevents the driven rollers from rotating, allowing for instantaneous termination of the conveying drum's rotation by switching the power supply state using a power supply switch, independent of the drive motor's power supply interruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power supply to the drive motor is cut off during emergency shut-down, then the drum rotation should terminate, but the drum continues to rotate due to residual electric charge and inertia
Solution Approach 1:
The patent applies preliminary anti-action by introducing a rotation brake that actively counteracts the drum's rotation before it can continue undesired rotation. The brake is pre-positioned and immediately activated upon emergency shut-down detection, creating an opposing force to the rotational motion caused by inertia and residual charge, thereby achieving immediate termination of rotation.
Solution Approach 2:
The rotation brake serves as an intermediary component between the power supply system and the drum. When emergency shut-down occurs, the brake is activated as a mediating element to transfer and dissipate the rotational energy, preventing the drum from continuing to rotate due to residual electric charge and inertia. The brake acts as a buffer that absorbs the kinetic energy and brings the system to a safe stop.
2Reliability
If a rotation brake is added to prevent drum rotation, then emergency stop capability is improved, but device complexity increases due to additional power supply and control circuitry
Solution Approach 1:
The second power supply unit is designed with multi-functionality, serving both the rotation brake during emergency shut-down and potentially other system functions during normal operation. The control circuit is integrated to manage multiple functions through a unified control logic, reducing the need for separate dedicated circuits and thereby minimizing the increase in device complexity while maintaining improved emergency stop capability.
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
Enables immediate and controlled stopping of the conveying drum's rotation upon emergency shut-down, preventing continued undesired rotation and ensuring timely cessation of the conveyance process.
Implementation Method 1
a drive motor to rotate the drum to convey a sheet medium along an outer circumferential surface of the drum
Implementation Method 2
a rotation brake to prevent rotation of the driven roller
Data Source
AI summary
A drum conveyance mechanism includes a drum, a drive motor to rotate the drum to convey a sheet medium along an outer circumferential surface of the drum, a first power supply to supply an operating voltage to the drive motor, a driven roller to rotate as the drum rotates, a rotation brake to prevent rotation of the driven roller, a second power supply to supply an operating voltage to the rotation brake, and a power supply switch to switch a state of supply of the operating voltage from the first power supply and the second power supply.