Image-Forming Transfer Unit With High-Voltage Terminal Blocking
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Solution Overview
Problem
Existing image forming apparatuses lack an effective mechanism to prevent electric shocks when a movable unit supporting a transfer member is separated from an image-carrying member, exposing terminals and increasing the risk of user contact with transfer voltage.
Innovation Solution
An electric shock preventing mechanism that includes a movable unit, a first and second terminal, a blocking member, and a latch mechanism, which ensures the second terminal contacts the first terminal only when the movable unit is in a standard position, blocking access to the first terminal when separated, thereby preventing contact with the transfer voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the movable unit is separated from the image-carrying member for maintenance or replacement, then accessibility and ease of operation are improved, but the risk of electric shock increases due to exposed terminals
Solution Approach 1:
A blocking member is introduced as an intermediary element between the user and the first terminal. This blocking member physically obstructs access to the high-voltage terminal when the movable unit is in the separated position, thereby mediating the safety risk while maintaining operational accessibility.
Solution Approach 2:
The latch mechanism performs a preliminary action by automatically engaging the blocking member to block access to the first terminal before any user interaction with the exposed terminal can occur. This preliminary safety measure is triggered by the position of the movable unit itself, preventing the harmful effect before it can manifest.
2Object-affected harmful factors
If a power supply disconnection mechanism is added to prevent electric shock, then safety is improved, but device complexity increases
Solution Approach 1:
Instead of introducing a complex power supply disconnection mechanism, the patent uses a simple blocking member as an intermediary physical barrier. This approach achieves the same safety effect (preventing contact with high voltage) through a mechanically simple means rather than an electrically complex system.
Solution Approach 2:
The blocking member and latch mechanism constitute a simple, low-cost mechanical safety system compared to complex power disconnection mechanisms. These components are structurally simple and can be easily manufactured, maintaining safety without adding significant device complexity.
3Reliability
If terminals are kept connected during movable unit separation, then electrical connection reliability is improved, but safety deteriorates due to exposed high-voltage terminals
Solution Approach 1:
The safety function is segmented from the electrical connection function. The blocking member provides physical segmentation by creating a spatial barrier that separates the user access zone from the high-voltage terminal zone, allowing electrical connection to remain intact while safety is independently ensured through physical blocking.
Solution Approach 2:
The blocking member acts as an intermediary element that allows the electrical connection to remain connected (maintaining reliability) while simultaneously preventing harmful contact (improving safety). It mediates between the need for continuous electrical connection and the need for user safety by providing a physical barrier.
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
Effectively prevents electric shocks by ensuring the second terminal remains disconnected from the first terminal when the movable unit is separated, maintaining safety without a complex power supply disconnection mechanism.
Implementation Method 1
The transfer member causes the toner image to transition from the image-carrying member to the sheet by using an electric field caused by the transfer voltage
Data Source
AI summary
A transfer member is supported by a movable unit. A blocking member is movable between a blocking position at which an access path to a first terminal is blocked and an opening position at which the access path is opened. A second terminal is supported by the movable unit. Following movement of the movable unit, a latch mechanism latches the blocking member at the blocking position when the movable unit is located at a separated position and unlatches the blocking member when the movable unit moves from the separated position to a standard position. When the movable unit moves from the separated position to the standard position, the second terminal moves to a position at which the second terminal comes into contact with the first terminal through the access path.