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High-precision bearings for printing presses

by:JNSN     2022-03-15
INA High Precision Bearings for Presses Press bearings are used in the main cylinders of sheetfed and web-fed presses. Thanks to their load-carrying capacity, stiffness, precision and fine-tuning properties, they meet the core requirements for perfect support for printing presses, ie the highest print quality. These bearings are specially designed for each application by our application technicians and press manufacturers working closely together. Therefore, they can well meet the needs of customers. It is very important to match the design for a specific machine solution, because too high requirements are a waste of resources, and too low requirements can reduce machine performance. However, finding the best solution in bearing arrangement is not an easy task. The Schaeffler Group has extensive experience in bearing development, design and production, and its know-how can always provide the best solution for complex bearing applications. Moreover, we can also consider from both technical and economical aspects. Comprehensive solution for best printing quality Due to the complexity of application requirements, only a small part of printing machinery bearings can be standardized. Therefore, there are many types and sizes of printing press bearings. In addition to the typical multi-row, high-precision cylindrical roller bearings NN, NNU, N4N, N4U, it also includes floating bearing units with or without eccentric rings, locating bearing units, polygon bearings, combined linear and rotary bearing units and tapered roller bearing units Sub bearing unit. Bearings are available with or without seals. The journals at both ends of the drum can be cylindrical or conical in design. Printing machinery bearings are economical bearing arrangements that meet the demands of printing machinery for high throughput, low maintenance costs, and excellent print quality. State of the art Schaeffler Group has issued this latest sample TPI 222 replacing sample LFD. Data in the sample reflects technology and manufacturing levels as of January 2014. Not only reflects the progress of rolling bearing technology, but also contains experience in practical application. Any information in previous publications that differs from the data in this sample is invalid. Technical requirements: Press bearings are used for the centering of plate cylinders, blanket cylinders, impression cylinders and transfer cylinders. This means that the bearing has to meet a series of requirements as far as possible. The precision of the roller bearing arrangement has a decisive influence on the printing quality. Printing press bearings must ensure that all cylinders work together optimally during the printing process. There must be no relative movement in the radial and axial directions. Bearings therefore meet high demands in terms of zero clearance, rigidity and running performance. Also, the plate cylinder must be axially moved in a controlled manner to allow skew adjustment (diagonal registration function). Changing the center-to-center distance of the printing press cylinders In order to perform functions of the printing press such as press-on, off-press, or to compensate for different paper thicknesses, the center-to-center distance of the cylinders must be able to be changed. For this purpose, printing machinery bearings have eccentric rings that can be rotated through a certain angle reliably and with low friction, fig. 1 and page 13, fig. 2. Advantages of printing press bearings Compared to standard bearing solutions, printing press bearings from the Schaeffler Group offer users a range of benefits, as shown in the table below. Advantages Figure 2 Positioning by eccentric bearing rings 0001867F Advantages Description High precision is achieved by the precision of the bearing (tolerance class P5 or P4) and the bearing preload. Therefore, the bearing arrangement is zero clearance. The high precision and combination of high-rigidity bearing parts, and the preload, ensure the high radial rigidity of the system. Reliable eccentric adjustment Rolling element-based swivel bearings enable reliable, low-friction eccentric adjustment and prevent seizing and premature failure. Low operating temperature optimized structure design, bearing running friction is small. Therefore, the temperature rise is low. The compact structure combines all required functions in one bearing unit. Reduced parts count, simplified operation and more economical. There are obvious advantages in this aspect of the easy mounting of the bearing unit. Since multiple functions are combined into one bearing, installation is easier and safer.
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