Key Sheet Protruding Part Fixes Display Member in Compact Printers
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Solution Overview
Problem
Existing printing devices with limited space around the display member face challenges in securely attaching a display member without play, as previous techniques require sufficient space for fixing elastic members.
Innovation Solution
A printing device configuration that includes a casing, a display member, a printed circuit board, and a key sheet with protruding parts that apply force to the display member, eliminating the need for additional space around the display member for secure mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an elastic member is fixed to the supporting plate with screws to secure the display member, then the display member can be firmly attached without play, but sufficient free space around the display member is required which is not available in compact printing devices
Solution Approach 1:
The key sheet is divided into multiple functional segments: a base sheet portion that provides elasticity and a peripheral edge that contacts the display member, and multiple key tops that protrude to engage with recesses in the supporting plate. This segmentation allows the key sheet to perform both attachment and positioning functions without requiring additional space around the display member.
Solution Approach 2:
The key sheet serves multiple functions simultaneously: it acts as an elastic member for securing the display member, provides key tops for engagement with the supporting plate, and its peripheral edge serves as a positioning element. This multi-functionality eliminates the need for separate components and reduces the required space around the display member.
2Reliability
If the key sheet's peripheral edge faces the edge face of the display member to apply upward urging force, then the display member can be secured without play in limited space, but the key sheet structure becomes more complex
Solution Approach 1:
The key sheet merges the functions of the elastic member, positioning element, and engagement component into a single integrated structure. The base sheet and key tops are combined in one piece, eliminating the need for separate elastic members and positioning components, thus reducing overall device complexity while achieving reliable display member fixation.
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 secure mounting of the display member without play, even in devices with limited space, by using the key sheet's protruding parts to apply an upward urging force, effectively gripping the display member from multiple edges.
Implementation Method 1
The base sheet provides elasticity and is positioned beside the display member
Data Source
AI summary
A printing device includes: a casing, a display member, a printed circuit board, and a key sheet. The display member is configured to display information thereon. The display member has an edge face. The key sheet is fixed to the casing and faces the printed circuit board. The key sheet includes: a base sheet, a plurality of key tops, and a protruding part. The base sheet provides elasticity and is positioned beside the display member. The base sheet has a peripheral edge facing the edge face of the display member. The plurality of key tops is provided at the base sheet. The protruding part is provided at the base sheet. The protruding part includes a first protruding part protruding from the peripheral edge of the base sheet toward the display member and contacting the edge face of the display member to urge the display member.