Hole Cutter for Thermoforming Packaging Machine
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Solution Overview
Problem
Conventional hole punching devices in thermoforming packaging machines are time-consuming and costly to reconfigure for different package sizes and layouts, with issues of maintenance and air consumption, and often result in misalignment or complete severance of chads due to loose threaded punches.
Innovation Solution
A rigid punch holder with reciprocating movement and a cross-cut knife apparatus that allows for efficient hole cutting and slicing, using a single actuator for all punches and a platen with adjustable recesses for film-cutting punches, ensuring reliable chad formation and reduced maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If individual pneumatic cylinders are used to punch holes in each package, then hole punching can be performed simultaneously across multiple packages, but the device complexity and maintenance costs increase significantly
Solution Approach 1:
The patent merges multiple individual pneumatic cylinders into a single pneumatic cylinder that drives a common punch holder containing multiple punches. This consolidation maintains the ability to punch holes in multiple packages simultaneously while reducing the number of pneumatic components from multiple cylinders to just one, thereby reducing device complexity and maintenance requirements while preserving productivity
2Ease of operation
If threaded cylindrical punches are used, then easy installation and removal is achieved, but the punches tend to loosen and turn over time causing misalignment
Solution Approach 1:
The patent segments the punch assembly into a modular punch holder that can be easily removed and replaced as a unit, while the individual punches within the holder are secured in a fixed position. This allows for easy maintenance by replacing the entire punch holder assembly rather than individual punches, while the internal segmentation of the holder ensures each punch remains securely positioned and aligned during operation
Solution Approach 2:
The punch holder is pre-configured with multiple punches in their correct positions and orientations before being installed in the machine. This preliminary arrangement ensures that when the punch holder is installed, all punches are immediately in their correct aligned positions, eliminating the need for individual adjustment and preventing loosening during operation
3Ease of manufacture
If the punch extends completely through the package, then hole cutting is thorough, but the chad is completely severed from the package
Solution Approach 1:
The patent applies partial action by designing the punch to extend only partially through the package thickness rather than completely through it. The punch penetrates sufficient depth to create a clean hole and separate the chad from the main package body, but stops before completely severing the chad, allowing it to remain attached for proper disposal while achieving thorough hole cutting
4Productivity
If multiple pneumatic cylinders are used for hole punching, then simultaneous punching of multiple packages is achieved, but air consumption and operating costs increase significantly
Solution Approach 1:
The patent combines the function of multiple pneumatic cylinders into a single pneumatic cylinder that drives a common punch holder. This single cylinder delivers the necessary force to move multiple punches simultaneously, achieving the same productivity as multiple cylinders while consuming significantly less pressurized air and reducing operating costs
Data Source
AI summary
An apparatus is provided for cutting holes and slicing through a web of formed, filled and sealed product packages in a thermoforming packaging machine. The apparatus uses a single actuator to move a row of film-cutting punches between extended and retracted positions for cutting holes and corresponding chads in a marginal film area of the web of thermoformed product packages and a cross cut knife to slice through the marginal film area to separate rows of the thermoformed product packages.