Blister Pack Punch Guidance for Precise Shearing and Defect Skipping
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Solution Overview
Problem
Existing punching devices for blister packs struggle with precise punch guidance and fail to efficiently eject defective portions, leading to potential damage and errors in the packaging process.
Innovation Solution
A punching device with movable punching elements, guided by precise punch guides and adjustable units, ensures accurate orientation and selective punching of blister packs, preventing defective portions from being processed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If linear guides with very small lateral play are used to guide punches, then punching precision is improved, but the risk of punch tilting and direct contact with the die increases
Solution Approach 1:
The invention replaces static linear guides with dynamic punch guides that can laterally displace relative to the punch. This dynamic capability allows the guide to accommodate minor misalignments and prevent punch tilting, while still maintaining punching precision through the guiding action. The guide's ability to move laterally resolves the contradiction by providing guidance without constraining the punch rigidly.
Solution Approach 2:
The punch guide acts as an intermediary element between the punch and the die. Instead of the punch directly contacting the die or being rigidly guided by linear guides, the punch guide mediates the interaction, providing lateral support and guidance while allowing controlled displacement. This intermediary structure prevents direct punch-die contact while maintaining punching precision.
2Manufacturing precision
If a narrow circumferential cutting gap is maintained between punch and die, then burr-free shearing is achieved, but the punching elements are vulnerable to wear and damage
Solution Approach 1:
The punch guide serves as a protective intermediary that prevents direct mechanical contact between the punch and die. By providing lateral guidance and support, the guide allows the maintenance of a narrow cutting gap for burr-free shearing while preventing the punching elements from experiencing damaging contact forces and wear.
Solution Approach 2:
The punch guide provides beforehand protection to the punching elements by preventing direct contact with the die before damage can occur. The guide structure anticipates and prevents harmful interactions, cushioning the punches from wear and damage while allowing the cutting gap to remain narrow for precision shearing.
3Productivity
If defective portions of the blister strip are punched out, then continuous processing is maintained, but separate ejection is required which is time-consuming and error-prone
Solution Approach 1:
The invention extracts defective portions of the blister strip from the continuous processing stream by preventing them from being punched out in the first place. Through detection and selective positioning, defective areas are identified and excluded from the punching operation, so they remain in the blister strip and are handled separately without requiring time-consuming ejection operations.
Solution Approach 2:
The system performs preliminary detection and positioning of defective portions before the punching operation. By identifying and marking defective areas in advance, the system prevents them from being punched out, thereby avoiding the need for subsequent separate ejection operations and maintaining continuous processing efficiency.
Data Source
AI summary
A punching device for punching out blister packs from a blister strip having at least a first and a second punching element. The first punching element has at least one punch and the second punching element has a die. The first punching element is movable back and forth in a punching direction in such a way that the punching device alternately assumes an open position and a closed position. The first punching element has a plurality of punch sets, each of which comprises a punch, an actuating plate and a plurality of punch guides, which extend between said punch and the actuating plate and are connected thereto, wherein the punch guides extend through a base plate of the first punch element. The base plate of the first punching element has a punch set stop, which is in contact with the actuating plate in an operating position of said punch.