Rotary Laser Bottle Marking With Cam-Synchronized Moving Heads
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Solution Overview
Problem
Existing label-less PET bottle marking technologies face limitations in marking efficiency due to fixed laser heads, deformation of markings, and mechanical failures in pressing assemblies, which hinder high-speed and high-quality marking.
Innovation Solution
A label-free marking device with movable laser heads and mechanical pressing assemblies, utilizing a cam disc mechanism for synchronized movement and adjustable positioning, combined with a cam disc and lifting mechanisms for reliable and cost-effective marking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laser heads are fixed on the frame, then the structure is simple, but the marking speed is slow and productivity is reduced
Solution Approach 1:
The laser heads are made movable by coupling them to the rotating active disc through lifting mechanisms and cam tracks. As the active disc rotates to convey bottles, the laser heads dynamically follow the bottles' positions, enabling high-speed continuous marking without sacrificing structural simplicity
Solution Approach 2:
The laser heads are merged with the bottle conveying system by mounting them on the same rotating active disc. This integration ensures that the laser heads automatically follow the bottles during rotation, synchronizing the marking operation with the conveying process to maximize marking speed
2Productivity
If the active ring disc rotates at high speed, then productivity increases, but marking quality deteriorates due to deformation
Solution Approach 1:
The laser heads are dynamically coupled to the rotating active disc through lifting mechanisms that follow the cam track. This dynamic coupling ensures the laser heads maintain precise positional relationship with the bottles throughout high-speed rotation, preventing marking deformation while enabling high rotation speeds
Solution Approach 2:
The cam track mechanism provides geometric feedback that guides the laser heads' movement. The cam profile is designed to exactly match the required laser head trajectory, ensuring precise marking quality even at high rotation speeds through passive geometric control
3Reliability
If cylinder-driven pressing assemblies are used, then bottles are securely held, but reliability decreases due to malfunctions and costs increase
Solution Approach 1:
The complex cylinder-driven pressing mechanism is replaced with a simpler cam-based mechanical system. The cam track passively converts the rotation of the active disc into the required pressing motion, eliminating cylinders and reducing mechanical complexity while improving reliability
Solution Approach 2:
The pressing mechanism is designed to be self-regulating through the cam profile. As the active disc rotates, the cam automatically provides the pressing force needed to secure bottles in the trays without requiring external control systems or complex actuation mechanisms
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 device achieves faster marking speeds with improved marking quality and reliability, reducing mechanical failures and costs, while enabling efficient recycling of PET bottles.
Implementation Method 1
laser heads are movable with the disc-shaped conveying module to mark the packaging bottles
Implementation Method 2
laser printing technology is applied to mark bottle bodies
Implementation Method 3
a first cam disc, a pair of first fixing frames, a first active rotating disc, a first follower disc, first pressing mechanisms and storage trays; the first cam disc is sleeved on the first rotating shaft and free from rotation of the first rotating shaft, and an outer ring of the first cam disc is provided with a first cam track
Data Source
Figure 1~2
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AI summary
The present invention discloses a label-free marking device, comprising: a frame, a disc-shaped conveying module, a laser marking module and a first driving module, wherein the disc-shaped conveying module is connected with a feeding device and a discharging device respectively, and packaging bottles enter the disc-shaped conveying module from the feeding device, and return to a conveyor through the discharging device after completing label printing on the disc-shaped conveying module; the laser marking module comprises a plurality of laser heads, the laser heads are arranged on, and distributed around a circumference of, the disc-shaped conveying module, such that the laser heads are movable with the disc-shaped conveying module to mark the packaging bottles at corresponding positions; an output end portion of the first driving module is connected with the disc-shaped conveying module, and can drive the disc-shaped conveying module to rotate. The present invention produces clearer markings, achieves faster marking speed, meets production requirements better, and realizes better marking effects; in the present invention, the marking process is more stable, the adjustment and maintenance are more convenient, and it is easier to change contents and sizes of markings, it is not easy to fail, and the maintenance and production costs are low.