Dynamic Speed Control for Variable Pack Stacking in Print Processing
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Solution Overview
Problem
Existing print further processing systems face inefficiencies in producing small stacks or packs due to fixed cycle times, leading to reduced throughput and increased energy consumption, especially when handling varying product sizes and regionalization demands.
Innovation Solution
The system dynamically adjusts its operating speed based on a predefined production plan, allowing for the formation of stacks or packs of varying sizes by reducing production speed and introducing empty positions in the product sequence to manage load and energy use efficiently, utilizing multiple stacking devices and collating apparatuses to optimize throughput and reduce mechanical stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the processing cycle time is reduced to increase throughput, then productivity improves, but the minimum cycle time of about 2 seconds cannot be reduced further with known systems
Solution Approach 1:
The patent implements dynamic speed adjustment of the conveyance system, allowing the processing speed to vary continuously between minimum and maximum values based on real-time stack size requirements. This enables the system to adapt its cycle time dynamically rather than being constrained by a fixed minimum cycle time, thereby improving throughput for variable pack sizes.
Solution Approach 2:
The system changes the operational parameters (conveyance speed, processing speed) based on the detected stack size. By adjusting these parameters in real-time, the system can optimize the cycle time for each specific packing scenario, reducing the effective minimum cycle time and increasing overall productivity.
2Productivity
If multiple stacking apparatuses are arranged in parallel to increase capacity, then productivity improves, but device complexity and space requirements increase
Solution Approach 1:
The patent makes a single stacking apparatus capable of handling multiple stack sizes by implementing variable speed conveyance and dynamic product sequence adjustment. This multi-functional capability allows one apparatus to replace what would traditionally require multiple fixed-capacity apparatuses, reducing device complexity and space requirements while maintaining high processing capacity.
Solution Approach 2:
By introducing dynamic speed control and real-time sequence adjustment, a single stacking apparatus can adapt its capacity to match varying production demands, effectively replacing the need for multiple fixed-capacity apparatuses arranged in parallel.
3Productivity
If the production speed is maintained at maximum level, then productivity improves, but energy consumption and system wear increase
Solution Approach 1:
The system implements periodic acceleration and deceleration cycles based on the production plan and actual stack size requirements. Rather than maintaining constant maximum speed, the conveyance system accelerates to maximum speed during high-demand periods and reduces speed during low-demand periods, optimizing energy consumption while maintaining overall productivity.
Solution Approach 2:
The system uses feedback from stack size detection and production plan analysis to dynamically adjust production speed. This feedback mechanism allows the system to optimize the balance between productivity and energy consumption by reducing speed only when and where necessary, rather than maintaining constant maximum speed throughout the entire production process.
4Adaptability or versatility
If small stacks are produced to meet regionalization demands, then adaptability improves, but the same cycle time as large packs is required reducing efficiency
Solution Approach 1:
The patent implements dynamic speed adjustment that correlates with stack size. When small stacks are detected or planned, the system automatically reduces the conveyance speed to match the reduced processing requirements, maintaining optimal cycle times for each stack size. This dynamic adaptation allows efficient processing of both small and large stacks without the penalty of using the same cycle time for all pack sizes.
Solution Approach 2:
The system changes operational parameters (conveyance speed, processing speed) based on the detected or planned stack size. This parameter adjustment enables the system to maintain high processing efficiency for small stacks by reducing the cycle time proportionally to the stack size, rather than using the same fixed cycle time required for large packs.
Data Source
AI summary
The invention proposes a method for operating a print further processing system for producing and processing printed products, in particular for forming stacks or packs of printed product collections comprising completed final printed products such as periodicals and newspapers, which are preferably put together from a main product and a plurality of part products and/or inserts. The printed products are produced in accordance with a predefined production plan and, by means of a stacking device, are processed to form a sequence of packs (S1-S9) of individually predefined size; in order to produce part packs, the processing speed of the parts of the print further processing system that are connected upstream of the stacking device is reduced and, when a threshold value (T) is exceeded, empty positions are formed deliberately in the section of the product sequence allocated to the pack (S). The threshold value (T) is preferably a predefined value of the difference Δ in the size of successive packs (Sn−Sn+1).