Printing Press Drive Control with Segmented Motor Torque Distribution
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Solution Overview
Problem
The existing drive systems for sheet-fed printing presses face challenges in achieving synchronous control between offset and intaglio printing sections due to high load variations, leading to rotational speed variations and printing issues such as sheet misalignment and gripping errors, necessitating the use of high-capacity motors and limiting high-speed operation.
Innovation Solution
A drive control method that includes a gear train connecting the offset and intaglio printing sections, with an auxiliary motor in the intaglio section to manage load variations, and a clutch and gripper release mechanism for independent driving, allowing the prime motor to drive both sections efficiently and reducing motor capacity requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single high-capacity prime motor is used to drive both offset and intaglio printing sections, then the printing press can handle high load variations and maintain printing pressure, but the motor capacity increases, cost increases, and high-speed operation becomes difficult
Solution Approach 1:
The drive system is segmented into two independent motors: a prime motor for the offset printing section and an auxiliary motor for the intaglio printing section. This segmentation allows each motor to be sized appropriately for its specific load requirements, eliminating the need for an oversized prime motor while maintaining reliable printing pressure in the high-load intaglio section.
2Power
If separate prime motors are used for offset and intaglio printing sections to downsize the drive system, then motor capacity is reduced and cost is lowered, but synchronous control becomes difficult due to load variations causing rotational speed variations
Solution Approach 1:
A feedback control system continuously monitors the rotational speeds of both the prime motor and auxiliary motor, and adjusts the auxiliary motor's speed to maintain synchronization with the prime motor. This feedback mechanism compensates for load variations in real-time, enabling precise synchronous control without requiring complex mechanical linkages.
3Speed
If separate prime motors are used to allow independent driving of printing sections, then high-speed operation is enabled and cost is reduced, but sheet transfer precision deteriorates due to rotational speed variations
Solution Approach 1:
The feedback control system not only maintains synchronous rotation between motors but also ensures precise phase alignment at the sheet transfer point. By continuously adjusting the auxiliary motor's speed and position based on prime motor feedback, the system guarantees accurate sheet transfer even during high-speed operation with independent motor驱动.
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
According to a drive control method and apparatus, an offset printing section (20) and an intaglio printing section (30) are connected together by a gear train (41, 42, 43, 40a, 40b, 44, 45). Separately from an offset printing section prime motor (142) for driving an entire sheet-fed printing press (10), an intaglio printing section auxiliary motor (148) is provided in the intaglio printing section (30) where load is heaviest and load variations are great. By so doing, the entire sheet-fed printing press (10) is driven by the offset printing section prime motor (142) and the intaglio printing section auxiliary motor (148). Moreover, the electric current value (driving torque value) of the intaglio printing section auxiliary motor (148) is controlled in accordance with an electric current value (torque value) for driving the offset printing section prime motor (142), the torque distribution rate of the intaglio printing section auxiliary motor (148), and the rated electric current value of the intaglio printing section auxiliary motor (148).