Laser Capsule Marking System with Indexing Wheels
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Solution Overview
Problem
The pharmaceutical industry faces challenges in accurately and efficiently marking medicinal capsules while maintaining quality control and assurance, as conventional methods are inadequate for high-production rates and quality standards.
Innovation Solution
A system and method utilizing coaxial indexing wheels, a feeding mechanism, a laser marker device, an inspection system, a rejection subsystem, and a collection device for high-speed laser marking of pharmaceutical capsules, ensuring precise and permanent marking with UV laser technology, and quality verification through cameras and sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional marking processes are used, then device complexity is reduced, but manufacturing precision and productivity are insufficient for pharmaceutical standards
Solution Approach 1:
The system divides the marking process into distinct functional zones (loading zone, marking zone, inspection zone, reject zone, unloading zone) along the indexing wheel circumference. Each zone performs a specific operation, allowing the complex pharmaceutical-grade marking process to be broken down into manageable, precision-controlled segments that can be independently optimized.
Solution Approach 2:
The patent replaces conventional mechanical marking methods with a laser marker device that uses optical energy to mark capsules. This substitution enables higher precision marking without the mechanical contact and variability associated with traditional mechanical marking systems, while the laser can be precisely controlled through digital positioning.
2Productivity
If high-production rates are achieved, then productivity increases, but quality control and measurement precision may deteriorate
Solution Approach 1:
The indexing wheels rotate continuously through all zones (loading, marking, inspection, reject, unloading) without stopping between operations. This continuous motion allows high-volume production while maintaining consistent quality control, as each capsule passes through all processing stages in an uninterrupted flow rather than being batch-processed.
Solution Approach 2:
The first inspection system captures images of marked capsules and provides real-time feedback on marking quality. The system can identify defective markings and trigger rejection actions, creating a closed-loop quality control system that maintains precision even at high production rates by immediately detecting and correcting deviations.
3Reliability
If multiple inspection and rejection systems are added, then reliability and measurement precision improve, but device complexity increases
Solution Approach 1:
The inspection system and rejection system are merged into a single integrated quality control station on the indexing wheel. The first inspection system and rejection subsystem work in conjunction within the same operational zone, allowing quality assurance functions to be combined rather than separated into independent systems, thereby improving reliability without proportionally increasing overall system complexity.
4Manufacturing precision
If capsules are transported through multiple zones with pausing, then manufacturing precision is maintained, but loss of time increases
Solution Approach 1:
The indexing wheels use periodic indexing motion with brief pauses at each zone to allow precision operations (marking during pause in marking zone, inspection during pause in inspection zone). This periodic stop-and-go motion enables high-precision work at each stage while maintaining overall system throughput through rhythmic, synchronized operation of multiple wheels.
Solution Approach 2:
Capsules are pre-positioned in pockets on the indexing wheels before reaching the marking zone, and the laser marker is pre-positioned and calibrated. This preliminary preparation ensures that when the capsule arrives at the marking zone during the pause, the marking operation can begin immediately with precise positioning, minimizing actual marking time while maintaining precision.
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 high-production rates of up to 50,000 capsules per hour with accurate and permanent marking, maintaining quality control by identifying and rejecting defective capsules, and ensuring compliance with industry standards.
Implementation Method 1
A system and method for high-production laser marking of capsules consumable by humans for therapeutic purposes
Implementation Method 2
ensuring precise and permanent marking with UV laser technology
Data Source
AI summary
A laser capsule marking system and method may comprise at least two indexing wheels, a feeding mechanism, a laser marker, a first inspection system, a rejection subsystem, a reject verification sensor, and a collection device. The wheels are coaxial and have respective circumferential peripheries with multiple open pockets distributed thereabout. Each pocket is configured to releasably receive a pharmaceutical capsule doped with pigment particles reactive to laser light. The indexing wheels are configured to be incrementally rotated in alternating indexing fashion for transporting discrete arrays of respective pockets through a loading zone, an inspection zone, a marking zone, a reject zone, and an unloading zone. An actuatable reject block may be provided to simultaneously blow a rejected capsule from its pocket, and draw it in for transport to a rejection bin. Each circumferential periphery may be comprised of multiple arcuate shoes removably and replaceably secured to their respective indexing wheel.