Electrical Box Trajectory Restriction During Assembly
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Solution Overview
Problem
The existing arrangement of an electrical box overlapping a high voltage board and an engine board in image forming apparatuses obstructs the operator's field of view, leading to potential damage during assembly as the box may accidentally contact the boards.
Innovation Solution
The design includes a frame protruding plate on the mounting surface and a box protruding plate with engaging portions that allow the electrical box to be turned around a parallel axis, restricting its trajectory and preventing contact with the first electrical board during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the electrical box is arranged to overlap the high voltage board and engine board, then the area of the rear frame is reduced and space efficiency is improved, but the operator's field of view is obstructed and the risk of accidental contact with the first electrical board increases
Solution Approach 1:
The patent introduces an intermediary mechanism (the protruding plate with engaging portion) that acts as a mediator between the electrical box and the frame side plate. This intermediary structure guides the assembly process by providing a defined engagement path, allowing the operator to assemble the electrical box without needing to see the first electrical board directly, thus resolving the field of view obstruction problem while maintaining the compact overlapping arrangement
2Productivity
If the electrical box is arranged to overlap the high voltage board and engine board, then space efficiency is improved, but the electrical box may accidentally contact the first electrical board during assembly causing damage
Solution Approach 1:
The patent applies preliminary anti-action by designing the protruding plate and engaging portion structure that prevents accidental contact before it can occur. The engaging portion is specifically shaped and positioned to guide the electrical box into its final position without allowing it to contact the first electrical board during the assembly process, thus preventing potential damage before it happens
Solution Approach 2:
The protruding plate serves as an intermediary structure that mediates the assembly process. Its specific geometry with the engaging portion creates a controlled engagement path that separates the movement trajectory of the electrical box from the first electrical board, preventing harmful contact while enabling the compact overlapping arrangement
3Device complexity
If the electrical box is assembled without trajectory restriction, then assembly is simpler, but the electrical box cannot be precisely positioned and may contact the first electrical board
Solution Approach 1:
The protruding plate with its specifically designed engaging portion acts as a positioning intermediary. The geometry of the engaging portion (such as a groove or shaped feature) naturally guides the electrical box into the correct position during assembly, providing precise positioning without requiring complex alignment procedures or additional positioning devices, thus maintaining assembly simplicity while achieving precise positioning
Data Source
AI summary
An image forming apparatus includes a frame side plate. A mounting surface of the frame side plate on which a first electrical board is mounted has a frame protruding plate. An electrical box has a box protruding plate overlapping a side surface of the frame protruding plate when assembling of the electrical box to the frame side plate is completed, and engaging portions for assembling protruding in a thickness direction from the box protruding plate. When the electrical box is assembled to the frame side plate, with the engaging portions for assembling in engagement with first engaged portions formed on a protruding side end of the frame protruding plate, the electrical box as a whole is turned around an axis parallel to an extending direction of the frame protruding plate with the engaged portions as a fulcrum, thereby restricting a trajectory of the electrical box during assembling.