Dual-Side Tablet Printing Alignment via Score Line Detection
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Solution Overview
Problem
Existing tablet printing technologies only print on one side of a tablet, leading to issues with alignment and information loss when tablets are split along score lines, as printing directions often differ between the front and back sides, compromising the integrity of medical agent identification.
Innovation Solution
A tablet printing apparatus and method that includes conveyor belts and image capturing and printing heads to capture and align both sides of tablets, ensuring printing occurs in the same direction relative to score lines on both sides, using a controller to synchronize and correct printing positions based on captured image data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If printing is performed on both front side and back side of tablets using existing technologies, then printing coverage is improved, but printing direction alignment deteriorates causing information loss when tablets are split
Solution Approach 1:
The system captures images of the score line on the front side of tablets before printing on the back side. This preliminary action allows the control unit to determine the score line direction in advance and adjust the printing direction accordingly, ensuring that printing on both sides aligns properly when tablets are split along the score line.
Solution Approach 2:
The system uses image capture to detect the actual orientation of score lines on tablets, then feeds this information back to the control unit which adjusts the printing direction. This feedback mechanism ensures that printing direction is dynamically aligned with the score line orientation, preventing information loss when tablets are split.
2Reliability
If printing direction conforms to score line orientation, then information integrity is improved, but device complexity increases due to multiple image capturing and conveyor parts
Solution Approach 1:
The first and second image capturing parts serve multiple functions: they capture images for position detection, orientation detection of score lines, and provide data for printing direction determination. The conveyor parts not only transport tablets but also facilitate the turning operation. This multi-functionality reduces the need for additional dedicated components.
Solution Approach 2:
The system combines image capture, orientation analysis, and printing direction control into an integrated process. The control unit consolidates the functions of determining front side printing direction and back side printing direction based on the same score line image data, merging multiple control functions into a single coordinated system.
3Adaptability or versatility
If tablets are turned upside down between printing operations, then dual-side printing capability is improved, but processing time increases
Solution Approach 1:
The conveyor parts continuously transport tablets through the printing system without interruption. Tablets are turned upside down during continuous conveyance rather than being stopped for repositioning. The printing operations on front and back sides are performed in sequence during continuous motion, maintaining uninterrupted processing flow.
Solution Approach 2:
The system uses dynamic tablet repositioning where tablets are turned upside down during conveyance rather than static repositioning that would require stopping the process. The conveyor system enables dynamic adjustment of tablet orientation while maintaining continuous motion, reducing idle time between printing operations.
Data Source
AI summary
A first score line camera captures an image of one sides of a plurality of tablets being conveyed by a conveyor drum. During transfer from the conveyor drum to a first conveyor belt, all the tablets are turned upside down while their directional properties are maintained. A second score line camera captures an image of opposite side of the tablets being conveyed by the first conveyor belt. Based on image data about both the front sides and back sides of the tablets acquired by the first and second score line cameras, a first ink-jet head performs front-side printing process on a front side of a tablet to conform to a predetermined direction relative to a score line in this front side. The second ink-jet head performs back-side printing process on a back side of a tablet to conform to a direction on the back side same as the predetermined direction.