Hinged Top of Form Sensor for Versatile Media Detection
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Solution Overview
Problem
Conventional top-of-form sensing apparatus in thermal transfer printers lack versatility in handling different media types, require adjustments for precise location detection, and are not easily removable for maintenance.
Innovation Solution
A modular optical sensor assembly with a hinged base and cover, featuring a flexible circuit with LEDs and photo sensors, capable of detecting various media indicators like black marks, holes, and notches on both sides, and allowing for plug-in-play installation and easy maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional transmissive or reflective sensors are used to detect media indicators, then the sensor can locate top-of-form positions, but the sensor assembly requires adjustments and cannot handle all media types universally
Solution Approach 1:
The sensor assembly is designed to perform multiple functions by integrating both transmissive sensing (for holes/notches/gaps) and reflective sensing (for black marks) capabilities within a single fixed assembly. The array of LEDs and photo sensors can detect various media indicators including holes, notches, gaps, and black marks on different sides of the media, eliminating the need for manual adjustments while handling all media types universally.
2Measurement precision
If the sensor assembly is made adjustable for precise location detection, then detection accuracy improves, but manufacturing costs and assembly complexity increase
Solution Approach 1:
The sensor assembly is pre-configured with an array of LEDs and photo sensors at fixed positions that are predetermined to achieve optimal detection accuracy. The assembly includes a specific arrangement of transmissive and reflective sensing elements that are factory-calibrated to detect media indicators at the required precision levels without requiring field adjustments, thereby simplifying manufacturing and assembly while maintaining high measurement precision.
3Ease of repair
If the sensor is made removable for easy maintenance, then maintenance accessibility improves, but connection reliability and signal stability may worsen
Solution Approach 1:
The sensor assembly is segmented into a modular design that can be easily removed and installed as a complete unit. The flexible circuit board with LEDs and photo sensors is configured to allow the entire sensor assembly to be detached and reattached without compromising connection reliability. This modular segmentation enables easy maintenance while maintaining stable electrical connections through proper connector design.
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 precise and versatile detection of media location without adjustments, reducing manufacturing costs and complexity, and facilitating easy maintenance by allowing the sensor to be fixed in a single location and easily removed for cleaning.
Implementation Method 1
This sensor shines a light at the label while another sensor measures how much light is getting through
Implementation Method 2
Instead of shining light through the label it shines light on the bottom of the media and monitors how much light is reflected back
Implementation Method 3
A flexible circuit communicably fixed to the base and cover and may include an array of light emitting diodes (LEDs)
Data Source
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Figure 3A~3B
AI summary
A sensing apparatus operable for sensing top of form indicators on media within a print station is provided. The sensing apparatus generally including a base and a cover hingedly attached to each other and being operable for manipulation between an open and closed position, a flexible circuit affixed to the interior surfaces of the base and cover, the flexible circuit comprising an array of optical sensing devices, and an interface connector integral the base for connection to a control unit of a print station. The optical sensing devices generally include any one of light emitting diodes and photo sensors and are operable for the detection of holes, notches, black marks and gaps located on a media passing through the sensing apparatus.