Circuit Board Hook Mounting For Wire Harness Clearance
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Solution Overview
Problem
Existing circuit board mounting methods face challenges in securely fastening boards along a vertical direction without pinching electric wires and ensuring precise alignment, particularly in image forming apparatuses.
Innovation Solution
A circuit board mounting structure featuring a hook and rotation restricting portion that supports and secures the board, combined with a fitting mechanism to prevent wire pinching and ensure accurate positioning, utilizing a sheet metal member with half-punch processed protrusions for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a circuit board is fixed to a mounting surface along an up-down direction by a plurality of screws, then the circuit board can be securely fastened, but it is difficult to prevent the circuit board from falling and ensure precise alignment
Solution Approach 1:
The hook protruding from the mounting surface is inserted into the hanging hole of the circuit board before screw fastening. This preliminary action guides the circuit board into the correct position and prevents falling, enabling subsequent precise alignment and secure fastening by screws
2Reliability
If a hook is provided on the mounting surface to support the circuit board, then the circuit board can be prevented from falling, but rotation of the circuit board around the hook may occur
Solution Approach 1:
The rotation restricting portion is designed with an asymmetric shape that corresponds to the circuit board's edge shape. This asymmetric design allows the rotation restricting portion to contact the circuit board at a specific position, preventing rotation around the hook while maintaining the support function
3Reliability
If the circuit board is mounted close to the mounting surface with proper alignment, then secure attachment is achieved, but wire harness routing may be compromised
Solution Approach 1:
The wire harness routing path is designed to extend in the horizontal direction (left-right direction) rather than vertically. This dimensional change allows wire harnesses to be routed along the outer sides of the circuit board without interfering with the vertical mounting structure, achieving both secure attachment and proper wire routing
Data Source
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AI summary
A circuit board (5) has a first side (5a) (5a) and a second side (5b) (5b) that form both edges in a first direction, and a third side (5c) (5c) and a fourth side (5d) (5d) that form both edges in a second direction. The circuit board (5) has a hanging hole (51) and a plurality of screw insertion holes (52). The hanging hole (51) is formed in a portion of an edge portion along the first side (5a) (5a) of the circuit board (5) near the third side (5c) (5c). A mounting portion (6) (6) has a hook (61), a plurality of fastening holes (62), and a rotation restricting portion (63). The hook (61) is inserted into the hanging hole (51). The rotation restricting portion (63) restricts the rotation of the circuit board (5). A dimension of the hanging hole (51) in the first direction is larger than an up-down direction of the hook (61), and a plurality of wire harnesses (8) are wired from the mounting portion (6) (6) side via the outer sides of the third side (5c) (5c) and the fourth side (5d) (5d) of the circuit board (5).