Installation Tool For Thread Insert Installation Tool For Thread Insert,Helicoil Inserting Tool,Helicoil Threaded Mandrel Tool,Helicoil Prewinder Installation Tool Shenyang Helisert Technology Co., Ltd , https://www.helisert.comAnalysis of the Skills for Single-Sheet Main Roller Support Bearings
Sheet-fed offset presses are increasingly becoming the mainstream in the printing industry due to their superior layout and high print quality demands. As a result, domestic manufacturers have evolved from producing monochrome and two-color machines to four-color and multi-color models. Each color unit in these presses consists of components like the plate cylinder, blanket cylinder, pressure roller, and transfer roller, along with ink systems. The working accuracy of the main roller directly impacts the final print quality.
In response to the growing demand for precision, both domestic and international printer manufacturers have raised their expectations for the performance of main roller bearings. Bearings play a crucial role in ensuring smooth operation, and many manufacturers are willing to invest more in high-quality bearings to enhance product value.
Over time, the development of sheet-fed presses has led to significant innovations in main roller bearings. From brass plain bearings to roller bearings, and from needle bearings to combined and three-ring bearing systems, the design has continuously improved. These advancements have increased the precision of the bearings, simplified installation, and enhanced protection.
Firstly, needle roller bearings offer greater rigidity compared to tapered roller bearings due to their smaller roller diameter. Companies have developed double-column misaligned needle bearings that match the rigidity of copper sleeve sliding bearings. In terms of grouping, the needle rollers used in printing machine applications are grouped at 1 μm, which is more precise than the standard 2 μm grouping found in general bearings. This allows for clearance less than 1 μm, meeting the requirements of high-end printers and reducing the need for complex wallboard processing.
Secondly, while needle roller bearings are effective, they often require high-precision housings and careful installation. To address this, manufacturers introduced roller bearings with an integrated flanged outer ring. These bearings can be pre-tightened for better precision and rigidity, and the use of a tapered inner ring allows for easy adjustment of clearance. This system enables zero clearance in printing cylinder bearings, making it easier for manufacturers to handle alignment and stability issues. Brands like Manroland, Heidelberg, Libbey, and Beiren widely use this type of bearing, making it the standard in modern printing machines.
Thirdly, inspired by the automotive industry, printer manufacturers are seeking modular components that simplify assembly, reduce errors, and lower rework rates. Bearings are now supplied as high-precision units with easier installation and maintenance. For example, the three-ring bearing unit integrates the bearing and the pressure sleeve, providing support, pressure application, and registration functions all in one. This design has been widely accepted by manufacturers and is now commonly used in new and retrofitted models.
The use of labyrinth seals and cylindrical rollers ensures smooth lubrication and long service life. This makes the three-ring bearing not only highly efficient but also the most durable option available. It shifts the focus of precision from in-house production to specialized bearing manufacturing, aligning with modern industrial trends.
In conclusion, the various bearing solutions for single-sheet main roller support systems are well-suited to meet the needs of domestic manufacturers looking to develop more advanced and distinctive products. With high demands on precision and reliable support for rotating and linear components, these technologies are proving to be essential in the evolving printing industry.
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Source: Bearing Network | Date: April 10, 2013