SU1708646A1 - Printing device in relief and surface printing machines - Google Patents

Abstract

The invention relates to the printing industry and can be used in inks for viscous paints, in printing machines for high and flat printing. The purpose of the invention is to improve the quality of printed products by ensuring the uniformity of the ink layer transferred to the plate cylinder. The printing device of machines for high and flat printing contains a printing machine including a plate cylinder, an inking machine including an ink supply group, a roll group having rollers with an elastic / surface and contact cylinders with them, rubbing and rolling rollers, the relative position adjustment mechanism rollers and cylinders and drive. The roll cylinder has elastic surfaces and is associated with the contact rollers and the forme cylinder by means of a rigid kinematic connection. 5 illustrations The invention relates to printing production and can be used in inks for viscous inks, for example in printing machines of high and flat printing. The aim of the invention is to improve the quality of printed products by ensuring uniform ink layer transferred to the plate cylinder. . Figure 1 shows a diagram of the contact of cylinders with elastic and rigid surfaces; in fig. 2, 3 and 4 - schemes of printing devices; in fig. 5 is a diagram of contacts of cylinders with elastic surfaces. The printing device of machines for high and flat printing (FIGS. 2, 3, 4) contains a duct cylinder 1, roll cylinders 2, and 3, ratting cylinder 4, rolling roller 5 in contact with The working surface of the plate cylinder 6. At the same time, the ductor cylinder 1 is made with a rigid surface and is matched with its cylindrical surface with a doctor blade 7, and the roll cylinders 2 and 3 and the knurling roller 5 are made with elastic surfaces. the apparatus (Fig. 2) is made with with a smooth surface, and in a colorful annapgje (FIC 4) with an elastic surface. These cylinders are installed after the contact zone of the knurling roller 5 with the surface of the plate cylinder 6. The cylinders of the dyeing apparatus are driven as follows: • respectively 8, 9, 10, 11, kinematically connected through gears 12, 13 and 14 with gear 15 fixed to the form of the plate cylinder 6. At the same time, the ramming cylinders 4 also have an axial drive (not shown). Ductor Cylinder 1 Th-V4 O 002: o > &

Description

The gear train 16 is associated with an individual drive motor 17 having a smooth adjustment of its angular velocity. At the same time, the squeegee 7 is provided with a sharp edge interacting with the cylindrical surface of the ductor 1. The drive of the knurling roller 5 is friction from contact with its surface of the roll 2, the rubbing roll 4 and the mold 6 cylinder.

The work of the proposed inking apparatus is as follows. The doctor cylinder 1. rotating from the individual electric motor 17, extracts with its cylindrical surface a certain layer of paint with a thickness determined by the size of the gap between its surface and the sharp edge of the squeegee. The paint layer removed by the dictor is split in the process of moving it with the surfaces of the rolling 2, 3, rubbing 4 cylinders and the rolling roller 5 in the corresponding contact zones between them. As a result, a paint layer is created on the surface of the rolling roller 5, which is technologically necessary to obtain a high-quality paint image on the imaging form elements on the plate cylinder 6. After the paint is transferred to the imaging shape elements, a relief is created on the surface of the rolling roller that corresponds to the imaging shape elements. This relief is eliminated on the surface of the knurling roller as a result of rotation and axial movement — relatively less than the surface.

rubbing cylinder 4.

Making the contact cylinders of the roll group with elastic surfaces avoids slippage of the latter in the contact zone, since both elastic surfaces of the contact cylinders are deformed on the plane. If the linear velocities of the points of both contacting surfaces on the contact area are equal, their relative linear velocity will be zero.

FIG. 5 of the 1st; points a and b are the boundaries of the contact zone with elastic surfaces.

For the first cylinder we have

OiM Ri3Cos "1, OiK Ri3Cosa, / cos

OG1CH Rl3

current radius to any point K of the pad,,

Vi OiKWi P1eOL cosai / cos «ii linear velocity of a point K. 1 008011 Ri9Wi« cosaii «cos ac / cos« ii Ri3ft i. cosai

projection of the linear velocity of the current point of the elastic surface of the cylinder onto the contact pad.

Thus, ViK const.

Similar calculations and on the calculation of the linear velocity V2 and its projection V2K for the 2nd cylinder on the contact area. In this case, W2k Ja2e- will take place (cos a2 const.

As can be seen from the diagram, in the case of equality

linear speeds Ri (Wi R (У2 (where Ri and R2 are the radii of the pitch circles of the driving gears of the respective cylinders with an elastic coating), the surfaces of the elastic driven cylinders do not slip in the contact zone.

Thus, using rollers with elastic surfaces as roll cylinders eliminates the slippage of these surfaces in the contact zones between themselves and the rolling roller, thereby stabilizing the thickness of the paint layer applied to the surface of the rolling roller, as well as significantly reducing the wear of these elastic surfaces.

As a result, the quality of printing is improved, and the wear of the elastic surfaces of the inking cylinders is reduced.

Claims (1)

Invention Formula The printing device of machines for high and flat printing, containing a printing machine, including a plate cylinder, an inking machine, including a paint supply group, a roll group having rollers with an elastic surface and contact cylinders with them, rubbing and rolling rollers, a mechanism for adjusting the relative position of the corresponding rollers and cylinders and actuator, characterized in that, in order to improve the quality of printed products by ensuring the uniformity of the color transferred to the plate cylinder a layer reeling cylinders have elastic surfaces and are associated with the contacting rollers and the plate cylinder by means of rigid kinematic linkage. .y 9- / J, // .JM / WWMI ffftf Kg ffSi S -e PS 9.W (2 (/ e.i