Printing Head Sensor Cover for Ink Mist Interference Detection
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Solution Overview
Problem
Ink mist generated during printing can adhere to interference object sensors in printing apparatuses, leading to potential detection failures and increased maintenance needs.
Innovation Solution
A printing apparatus with a cover mechanism that switches a detector between shielded and exposed states to reduce mist adherence on interference object sensors, allowing the sensors to move in tandem with the printing head and maintain effective detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the detector is continuously exposed to detect interference objects, then detection reliability is improved, but mist adherence increases causing detection failure
Solution Approach 1:
The cover is configured to dynamically change position based on head movement state. When the head is stationary, the cover shields the detector to prevent mist adherence. When the head moves, the cover opens to allow detection. This dynamic adjustment resolves the contradiction by making the detector exposed only when necessary for detection while shielded when mist generation is likely.
Solution Approach 2:
The detector alternates between shielded and exposed states in periodic cycles synchronized with head movement. The detector is exposed during head movement periods when mist generation is minimal, and shielded during stationary periods when mist accumulates. This periodic switching maintains detection reliability while minimizing mist adherence.
2Ease of repair
If the detector is shielded to prevent mist adherence, then maintenance effort is reduced, but detection capability is lost
Solution Approach 1:
The cover dynamically switches between shielded and exposed states based on real-time head movement detection. This ensures the detector remains clean (reducing maintenance) while maintaining detection capability whenever the head is in motion and mist generation is low.
Solution Approach 2:
The cover proactively shields the detector before mist can adhere, and opens the cover in advance when head movement begins to enable detection. This preliminary action prevents mist accumulation while ensuring detection readiness, reducing both maintenance needs and detection failures.
3Reliability
If the detector remains exposed for continuous detection, then interference object detection is reliable, but mist accumulates on the detector
Solution Approach 1:
The detector operates in periodic cycles of exposure and shielding. During head movement phases, the detector is exposed to detect interference objects. During stationary phases, the detector is shielded to prevent mist accumulation. This periodic operation maintains both detection reliability and detector cleanliness.
Solution Approach 2:
The cover dynamically adjusts its shielding state based on head movement status. When the head moves, the cover opens allowing the detector to detect interference objects. When the head stops, the cover closes to protect the detector from mist. This dynamic response maintains detector cleanliness while enabling reliable detection during movement.
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
Reduces mist adherence on interference object sensors, simplifies configuration, and minimizes maintenance efforts while ensuring reliable detection of interference objects.
Implementation Method 1
a light-emitting sensor head and a photoreceptor sensor head which are examples of an interference object sensor. The light-emitting sensor head and the photoreceptor sensor head detect the interference object
Data Source
AI summary
A printing apparatus includes a head that faces a medium supported by a medium support unit and ejects a liquid, an interference object sensor including a detector that detects an interference object with the head, and a cover that can switch the detector to a shielded state and to an exposed state.