Cutting of book blocks by a set of eccentric disc tools

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Kolomiiets A. B., Vatuliak Yu. V. № 1 (79) 103-111 Image Image

Non-stop cutting of book blocks is characterized by significant short-term efforts. Uneven energy consumption by the cutting tools drive motor reduces the reliability of the equipment. The aim is to develop a compact device for trimming book blocks with a set of eccentric disk tools, which will reduce the load on the drive (and thus reduce its power consumption) by providing periodic sequential contact of the blades of the disk tools with the book block during trimming.

The improved device for trimming book blocks consists of two straight knife holders located on both sides of the book block clamped in the conveyor, which is moving at a constant speed. Movable eccentric disc knives are evenly mounted on the knife holders, they are driven by a chain or belt drive from a common motor. Disc knives are located on knife holders with the ability to rotate around their own shafts with eccentricity. The eccentricity of rotation of each cutting disc knife offsets by a cyclic angle of one relative to the adjacent tools on the knife holder. Disc knives sequentially trim the block so that at a certain moment in time a small part of the tools carries out a cutting process. The design of the cutting device has been developed. The analysis of geometrical parameters of eccentric disk cutting tools is carried out, it shows their influence on the value of the cutting angle. The advantages of redistribution of the book block trimming process from the short part of the tool movement cycle to the full rotation of their movement are substantiated. Dependencies for calculating the maximum values of cutting angles are necessary for the optimal design of devices for trimming book blocks with a set of disk eccentric tools.

Previous research has shown that the change in cutting forces and maximum cutting angles are relating directly. Therefore, we would expect a reduction in power peaks when trimming book blocks and, consequently, a reduction in the power consumption of the device’s motor. Studies prove the energy efficiency of the device.

Keywords: book block, eccentric disc tool, angle of cutting, clamp, transporter, straight knife holder, direction of cutting.

doi: 10.32403/0554-4866-2020-1-79-103-111


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