Anti-static Brush for Encoder Scale Dust Control
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Solution Overview
Problem
Recording apparatuses face issues with dust and particles entering the encoder scale, leading to reduced detection accuracy due to potential electrical charging, which attracts dust and particles.
Innovation Solution
Incorporating an anti-static unit with a brush that is grounded via a base attached to the main body frame using an adhesive and elastic fixation, ensuring the brush contacts the encoder scale outside the reading region to prevent charging and maintain positional accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the encoder scale is electrically charged to prevent dust attachment, then dust and particles are repelled, but detection accuracy is reduced due to electrical interference
Solution Approach 1:
The harmful electrical charge is extracted from the encoder scale by providing a separate anti-static brush that contacts a non-reading region of the scale, allowing the reading region to remain electrically neutral and maintain detection accuracy while the anti-static brush prevents dust attachment through controlled discharge
Solution Approach 2:
The anti-static brush acts as an intermediary element between the encoder scale and ground, providing a controlled electrical discharge path that prevents dust attachment without interfering with the optical detection process in the reading region
2Manufacturing precision
If the base is attached using adhesive material, then positioning accuracy is improved, but the adhesive may peel off over time
Solution Approach 1:
Holes are provided in advance in the base at positions that do not affect anti-static brush functionality, allowing mechanical fastening to be performed before final assembly, ensuring both positioning accuracy and attachment durability
Solution Approach 2:
The adhesive material and mechanical fastening methods are combined to work together - adhesive provides initial positioning and distribution of fastening forces, while mechanical fasteners provide long-term structural support and prevent adhesive peeling
3Reliability
If the base is fastened by a fastener, then attachment reliability is improved, but the base may be rotated or twisted during fastening
Solution Approach 1:
Holes are pre-provided in the base at strategically positioned locations that do not interfere with anti-static brush contact with the encoder scale, allowing mechanical fastening to be performed without affecting the positional accuracy of the anti-static brush
Solution Approach 2:
The base is designed with differentiated regions - areas with holes for fastening that do not affect anti-static functionality, and areas that maintain structural integrity to prevent rotation or twisting during fastening operations
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
The anti-static unit effectively reduces the risk of dust and particle attachment to the encoder scale, maintaining detection accuracy and preventing smudging of the medium by ensuring the encoder scale remains grounded and free from electrical charges.
Implementation Method 1
an anti-static unit having an anti-static brush that is in contact with the encoder scale and a base that holds the anti-static brush
Implementation Method 2
the encoder scale can be easily grounded with a simple configuration
Data Source
AI summary
A printer includes an encoder scale having a reading region that is read by an encoder that detects a motion of a transport driving roller, and an anti-static unit having an anti-static brush that is in contact with the encoder scale and a base that supports the anti-static brush, wherein the anti-static brush is in contact with a region of the encoder scale other than the reading region.