Stacking Cassette with Synchronized Conveyor Transfer
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Solution Overview
Problem
The challenge is to ensure safe and efficient stacking of blister packs onto a packaging conveyor while maintaining a high production rate, as existing methods struggle with forming accurate stacks and transferring them without disrupting the production line due to misalignments and dropping issues.
Innovation Solution
An object-handling system with a cassette that forms stacks from the bottom up, using a suction belt to deliver objects one at a time into an upwardly open stack well, where the floor is lowered to control the drop distance, and synchronized movement with the conveyor ensures accurate transfer into transversely aligned cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If objects are stacked by dropping them from the input device, then the stacking process is simple and fast, but the objects become misaligned and canted as the stack grows
Solution Approach 1:
A conveyor belt acts as an intermediary mechanism between the input device and the stack well. The belt transports objects horizontally to the discharge location directly above the stack well, ensuring precise vertical dropping position. This intermediary system decouples the high-speed input from the precision stacking requirement, maintaining both speed and alignment.
Solution Approach 2:
Objects are transported and positioned on the conveyor belt before being dropped into the stack well. The conveyor belt performs preliminary positioning, ensuring objects are correctly aligned horizontally before the vertical dropping action occurs. This preliminary alignment prevents misalignment issues during stacking.
2Device complexity
If the stack is formed by dropping objects from a fixed height, then the input device operates simply, but objects must fall through different distances as the stack grows causing misalignment
Solution Approach 1:
The conveyor belt provides a dynamic positioning system that adjusts object placement based on stack height. As the stack grows, the belt continues to transport objects to the same discharge location, maintaining consistent drop height. The dynamic conveyor system compensates for the increasing stack height, keeping the drop distance constant.
Solution Approach 2:
The solution introduces a horizontal transport dimension via the conveyor belt, separating the horizontal positioning function from the vertical stacking function. Objects are positioned in the horizontal dimension by the conveyor, then dropped vertically. This dimensional separation allows the input device to remain simple while achieving precise positioning.
3Productivity
If objects are stacked quickly to maintain high production rate, then productivity increases, but process safety decreases due to misalignments disrupting the production line
Solution Approach 1:
The conveyor belt serves as a safety intermediary that ensures consistent, controlled delivery of objects to the stack well. By maintaining a constant horizontal transport mechanism, it prevents the misalignments that would otherwise occur with direct dropping, thereby ensuring process safety while maintaining high production rates.
Solution Approach 2:
The system incorporates sensors that detect object position and stack height, providing feedback to control the conveyor belt and dropping mechanism. This feedback ensures that objects are consistently positioned and dropped at the correct locations, maintaining both high productivity and process safety by preventing misalignments.
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
This solution ensures consistent and controlled stacking with minimal misalignment, maintaining production rate and safety by using a synchronized cassette movement with the conveyor, where the stack is formed from the bottom up with uniform drop distances and securely transferred into the conveyor cells.
Implementation Method 1
an object-handling system has according to the invention an input device that delivers objects one at a time to a transfer station
Implementation Method 2
the input device drops the objects one at a time into the well
Data Source
AI summary
An input device delivers objects one at a time to a transfer station next to a conveyor extending in a transport direction. A cassette defines an upwardly open stack well shaped to receive the objects and has a floor. The cassette is held in an upstream stack-forming position underneath the input device while the input device drops the objects one at a time into the well, and the floor of the cassette is stepped downward each time an object is dropped into the well by a distance generally equal to a vertical height of the object. When a predetermined number of the objects has been dropped into the well, the cassette is displaced downstream out of the upstream stack-forming position synchronously with the conveyor at the transport speed while the stack of objects in the well is pushed transversely of the direction out of the well into the conveyor.