Rotary Die Pin Ejector Insert With Compressible Core
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Solution Overview
Problem
Existing rotary die cutting systems face challenges in efficiently separating cut parts from media and preventing the accumulation of small die cut slugs in die cavities, which complicates setup and reduces operational flexibility.
Innovation Solution
A pin eject system with removably attached inserts on the rotary die cutting cylinder and anvil roll, utilizing compressible cores to bias ejector pins outward, facilitating the separation of cut parts and allowing for easy setup and changeover between jobs, eliminating the need to install pins through the cylinder bore.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pins are installed through the bore of the cylinder, then the pin eject system can separate cut parts from media, but the setup time and complexity increase
Solution Approach 1:
The system divides the pin eject mechanism into separate modular components: inserts with recesses are attached to the outer surface of the cylinder, while pins are held in corresponding recesses in the anvil roll. This segmentation eliminates the need to install pins through the entire cylinder bore, reducing setup time while maintaining the separation function.
Solution Approach 2:
The insert assembly acts as an intermediary component between the cylinder and the pin eject mechanism. By attaching inserts to the outer surface of the cylinder, the system provides a mounting interface that eliminates the need for through-bore installation, thereby reducing setup complexity and time while preserving the pin eject functionality.
2Reliability
If pins are installed through the bore of the cylinder, then the pin eject system can prevent slug accumulation, but the device complexity increases
Solution Approach 1:
The pin eject system is segmented into independent components: inserts with recesses attached to the cylinder outer surface, and pins held in separate recesses in the anvil roll. This segmentation simplifies the overall device structure by eliminating through-bore installation requirements and reducing the complexity of the cylinder assembly process.
Solution Approach 2:
Instead of installing pins through the cylinder bore from the inside out, the system inverts the approach by attaching inserts to the outer surface of the cylinder and holding pins in external recesses in the anvil roll. This inversion simplifies the installation process and reduces device complexity while maintaining the pin eject function to prevent slug accumulation.
3Ease of manufacture
If fixed pin configurations are used, then the manufacturing is simplified, but the adaptability to different media thickness and cut depth is reduced
Solution Approach 1:
The system employs removable inserts that can be easily attached and detached from the cylinder outer surface. This dynamic configuration allows the pin eject system to be adapted to different media thickness and cut depth requirements by selecting appropriate insert configurations, while the inserts themselves can be manufactured using standard processes.
Solution Approach 2:
The insert design provides universal functionality by being removable and replaceable. The same insert structure can be used with different pin configurations to accommodate various media thickness and cut depth requirements, making the system versatile while maintaining ease of manufacture through standardized insert components.
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 pin eject system effectively separates cut parts from media, prevents slug accumulation, reduces setup time, and enhances operational flexibility by allowing for customizable pin lengths and configurations based on media thickness and cut depth.
Implementation Method 1
The pin is located within the insert and is biased outward from the outer surface of the rotary die cutting cylinder by a compressible, springing core disposed in the bore of the rotary cutting cylinder
Implementation Method 2
the portion of the media in the cavity pushes against the ejector pin and the pin retracts through its hole in the insert against the compressible core
Data Source
AI summary
An insert assembly is received in a recess on the outer surface of a rotary cutting cylinder. The insert has a hole for a slug ejector pin which is slidingly engagable with the insert. The hole is arranged on the insert to communicate with a through hole in the recess that extends into the interior of the cylinder. When the slug ejector pin is inserted in the pin hole, the pin proximal end is received in the recess hole adjacent to the compressible core and the pin distal end projects from an outer surface of the insert. When the pin is assembled with the insert and the insert is assembled with the cylinder, the pin proximal end operatively engages the compressible core when the pin retracts into the pin hole of the insert and the pin proximal end operatively engages the insert when the pin projects from the pin hole.