FI59752C - BELASTNINGSANORDNING FOER VALSGRUPP - Google Patents

Description

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Patent Meddelat (51) K * .ik? /Int.ci.3 B 41 F 13/24 SUOM I —FI N LAN D (21) PwirttllnkMiui-hcwumeknlni 750566 (22) Hakemlspilvt - AmMcnlngadag 27-02.75 ^ (23) Alkupilvt —Gllti | h «t« Dai 27-02.75 (41) Tullut julklMkil - Bllvtt off * ntll | 28/8/76

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Patent- och ragistarstyralsan v 'AmWuui utl «« d och uti.ikrtftun public · ™; 30. Ob. »1 (32) (33) (31) Privilege requested —B« fird prlorltet (71) Oy Wartsila Ab, Värtsilä, FI; Sörnäisten rantatie 9 ~ 11, 00530 Helsinki 53, ^ Finland -Finland (FI) (72) Jorma Toropainen, Helsinki, Finland-Finland (FI) (54) Roller group loading device - Belastningsanordning för valsgrupp

The invention relates to a device according to the preamble of claim 1.

In general, compressing a row of rolls formed by superimposed rolls so that a compressive force is evenly distributed along the length of the rolls in each roll nip is difficult to perform because the loaded rolls bend, resulting in an uneven distribution of the pressing force in the roll nip. In order to reduce the deflection of the rollers, the rollers can be made stiffer, for example by increasing their outer diameter, or by providing them with a suitable known deflection compensation device. However, these solutions are expensive and cannot even be applied in all cases.

The object of the invention is to provide a device by means of which a relatively even load distribution is achieved in the roller row of the printing unit of an offset printing machine in a simple manner. The features of the invention appear from claim 1. Since in the device according to the invention the load is not applied to the roller bearings but directly to the jacket surface by means of rolling rings, the loading force has a shorter torque arm with respect to the roller casing. As a result, the uniformity of the load distribution is greatly improved, and in most cases it becomes so good that no other measures need to be taken to equalize the load distribution.

In order to obtain a suitable load distribution, it is advantageous for the load rollers to be combined into two roller load units which are articulated so that both rollers of the load unit load the roll row at least substantially equally. Since there must be a load at both ends of the roll row, it is most preferable to arrange the load so that one end of the roll row has a fixed load roller system and the other end of the roller row has a movable load roller system whose adjustable load force is adjustable.

The invention will now be described in more detail with reference to the accompanying drawing, in which - Figure 1 shows a front view of a printing roll group of an offset printing machine according to the invention, and - Figure 2 shows the same printing roll group in an axial direction of the rolls.

In the drawing, means the rollers of 1 printing unit of an offset printing machine, 2 machine bodies and 1 bearing housings of rollers guided in 3 bodies. At both ends of each roll there is a so-called a rolling ring, i.e. a ring, which accurately determines the distances between the axes of rotation of the rollers.

These rolling rings are loaded by load rollers 5, both at the upper end of the roller row and at its lower end.

Figure 2 shows the actual load system better. The load rollers 5 are paired together into load units 6, which are mounted at 7 so that both rollers of the unit load the row of rollers with at least substantially the same force. The upper load roller system is fixed, but the lower load roller system is movable and its load force can be adjusted. In the embodiment shown, the loading force is obtained from the working cylinder 8, but another suitable power source can equally well be used. The movable load unit is attached to a rotating lever arm 9. There are two of these arms, one at each end of the lower roll.

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Instead of the lever arm shown in the figure, another movable load system can just as well be used. The load system is designed to provide an equal load at both ends of the loaded roll.

The invention is not limited to the embodiment shown, but several variations of the invention are conceivable within the scope of the appended claims.

Claims (3)

An apparatus for providing a uniform compressive force in a row of rolls of a plurality of rolls (1) of an offset printing machine, the rolls being provided at both ends with shaft pins for bearing the printing machine body (2), characterized in that at least the outer rolls have the main compression of the roll row is arranged by means of relatively short loading rollers (5) or the like arranged to load the roll row through the rolling rings of said outer rollers (* 0), thus transferring the compressive force directly to said part of the frame of the outer rollers free of the central area of the body. Device according to Claim 1, characterized in that the load rollers (5) are included in two-roller load units (6) which are articulated so that both rollers (5) of the load unit (6) load the roller row at least substantially equally. Device according to Claim 1 or 2, characterized in that the load rollers (5) are included in load units (6) which load both ends of the rollers (1), which are arranged in such a way that the load units (6) at both ends of the rollers (1) load rollers basically as many. Device according to one of the preceding claims, characterized in that one end of the roller row has a fixed load roller system and the other end of the roller row has a movable load roller system, the load force caused by which is adjustable.