FR2459402A1 - DEVICE FOR FORMING THE RACKS IN PRINTING MACHINES - Google Patents

Abstract

A. THE INVENTION RELATES TO A DEVICE INTENDED FOR MOVABLE PARTS BY ROTATION OR TRANSLATION OF PRINTING MACHINES, ALLOWING A VERY NARROW GAME. B. THE LUBRICANT LAYER WHICH IS IN A SOLID STATE AND THE SLIDING SURFACE OF THE PART ARE IDENTICAL. C. THE USE OF A LUBRICATING LAYER AND A SPAN WHICH IS IN A SOLID STATE WILL MINIMIZE THE CLEARANCE NECESSARY FOR ROTATION OR TRANSLATION.

Description

The invention relates to a device for moving parts by

  rotation or translation, for example rolling pins of rolls, drums and rollers, as well as guides for rolling or sliding surfaces, in printing machines.

  In the construction of printing machines

  sea, to ensure the accuracy of the result of printing,

  knows of so-called support surfaces without play at low tolerances

  rances, in particular for cylinders (DD 64 064).

  Their disadvantage is that these surfaces-

  Supports said without play require special pads, expensive, or special arrangements, but that however, we can not ensure the absence of necessary clearance, because of the need for a slot lubrication (on average 40) for

  the admission of a lubricating agent into the bearing.

  This large lubrication gap significantly deteriorates the print result due to the change in height and roll position

  occurring during the passage of the canal, or in the position of impres-

this roll.

  The same drawbacks appear in the case of rolling or sliding guideways in printing machines, but here the problem of shifting must be added. The object of the invention is to improve the positioning and guiding of moving parts by rotation or

  by translation in printing machines, in order to

the product of printing.

  The invention aims to achieve

  bearings and guidance, with a very narrow, racing game.

  For this purpose, the invention proposes that the lubricating layer in the solid state and the sliding surfaces

of the bearing are identical.

  The bearing is provided for this purpose with a layer of nickel and graphite in the solid state or a layer consisting of molybdenum disulphide or a mixture of molybdenum, sulfur, molybdenum disulphide and others.

  molybdenum compounds and sulfur in the solid state.

  The invention will be better understood with the aid of an embodiment of realiation described below, and the accompanying drawings, in uuies the figures represent - Figure 1 a cylinder diagram for printing machine, - Figure 2 a bearing moving part in rotation (cylinder bearing).

  Figure 1 shows a group of cylinders

  of a printing machine, consisting of a printing cylinder

  1, an offset cylinder 2 and a platen roller 3.

  Each of these cylinders has a cylinder channel 1.1, 2.1 and 3.1 and a journal 1.2, 2.2 and 3.2. The pins are housed as shown in Figure 2, each in a bearing

  with sliding 4, itself mounted on the frame of the machine 5.

  On the sliding surfaces of the journals 1.2, 2.2 and 3.2, and / or on the sliding bearings 4, there is a lubricating layer 6. This lubricating layer 6 is identical to the sliding surface, that is to say that it is firmly bonded to the sliding bearing and / or trunnion, and is made of nickel and graphite, or molybdenum disulphide, or a mixture of molybdenum, sulfur, molybdenum disulfide and other molybdenum compounds and sulfur. The lubricating layer

  and at the same time sliding is here in the solid state.

  The invention is also applicable to guidance for movement

  translation and / or rotation. Thanks to the solution according to the invention, it is possible to maintain the lubrication slot to a very small dimension, and thus to propose

a landing almost without play.

3.- 2459402

Claims (3)

  1.- Support for moving part in rotation   or in translation, with a very narrow rotation   both a lubricating layer characterized in that the lubricating layer (6) which is in the solid state, and the surface   slip of the bearing, are identical.   2. Support according to claim 1, characterized in that the lubricating layer (6) is constituted   nickel and graphite, as a solid aggregate.   3. Support according to claim 1, characterized in that the lubricating layer (6) consists of molybdenum disulphide, or a mixture of molybdenum, sulfur, molybdenum disulphide, and other molybdenum compounds.   and sulfur, as a solid aggregate.