Printing Press Transport Speed Control for Waste Reduction
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Solution Overview
Problem
The synchronization of transport speeds between printing unit cylinders, folder cylinders, and conveyor devices in a printing press becomes inefficient during the transition from production to post-production, leading to unnecessary waste and reduced economic efficiency, as printed products are often sent to waste containers instead of further processing.
Innovation Solution
A method is implemented where the transport speed of printed products from the folder to the conveyor device is controlled by generating a signal independent of the current printing speed, maintaining optimal transport speeds until all products are processed, and then increasing speeds to ensure all products are moved to further processing or the mailroom, reducing waste and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transport speed is synchronized with printing machine speed during production, then printing efficiency is maintained, but during transition to post-production the folder and conveyor run empty causing waste
Solution Approach 1:
The control method dynamically adjusts the transport speed of the folder and conveyor device based on the operational state. During production, speeds are synchronized with the printing machine. During transition to post-production, the folder and conveyor continue running at optimized speeds independent of the stopped printing units, preventing empty runs and material waste while maintaining productivity during active printing.
Solution Approach 2:
The control method anticipates the transition from production to post-production by monitoring printing machine speed. When the printing machine slows down or stops, the system proactively maintains or adjusts folder and conveyor operation to ensure they don't run empty, thereby preventing waste before it occurs rather than reacting after the fact.
2Stability of the object's composition
If folder and conveyor speeds are reduced when printing speed decreases, then synchronization is maintained, but printed products cannot be fully transported to further processing
Solution Approach 1:
The system dynamically determines operational states (production vs. post-production) and adjusts speed control strategies accordingly. During production, speeds are synchronized. During post-production, the folder and conveyor operate independently at speeds optimized for completing product transport, ensuring all printed products reach further processing regardless of printing machine status.
Solution Approach 2:
The control method uses feedback from the printing machine's operational state to regulate folder and conveyor speeds. By monitoring whether the system is in production or post-production mode, the controller automatically adjusts speed relationships to maintain synchronization when needed and ensure complete product transport when printing stops.
3Ease of operation
If folder and conveyor run empty after printing stops, then transition to post-production is smooth, but approximately 40-50 copies are wasted and sent to waste container
Solution Approach 1:
The control method takes preliminary action by detecting when the printing machine enters post-production mode and proactively maintaining folder and conveyor operation. This prevents the folder and conveyor from running empty, ensuring that all printed products including the final 40-50 copies are successfully transported to further processing rather than being wasted in the waste container.
Solution Approach 2:
The invention converts the potentially harmful effect of continued folder and conveyor operation (which would normally cause empty runs and waste) into a beneficial outcome. By intelligently maintaining operation during post-production, the system ensures complete product transport and transforms what would be wasted material into salable products, improving economic efficiency.
Data Source
Figure 1
Figure 2
Figure 3a~3c
AI summary
The invention relates to controlling the transport of printed products (07) produced in a printing press (16), the printed products being transported from a delivery system (17) of a folding apparatus (01) of this printing press to a conveyor device (19) of a system (21) for further processing the printed products, the conveyor device being arranged downstream from the folding apparatus. At least during a continuous reduction of a transport speed (v06) of a substrate which is guided through the printing press and from which the printed products are produced, a signal indicating the current transport speed of the substrate is transmitted to the conveyor device of the system for further processing these printed products. Below a pre-set value for the continuously falling transport speed of the substrate, the signal which indicates this transport speed and which is transmitted to the conveyor device of the system for further processing the printed products is generated by a set-point generator (27) independently of the actual transport speed of the substrate and is transmitted to the conveyor device of the system for further processing the printed items.