DE2949957C2 - Printing unit for a web-fed rotary offset printing machine - Google Patents

Description

with the inking and dampening units attached to the cylinders the pressure cylinder unit are adjustable, thereby marked that

- The inking unit module (12) is pivotably mounted in the side stands (22, 24) that it is in a disengaged position outside the area directly above the printing cylinder unit ^; t (14) is pivotable, the inking unit side cheeks (32, 34) being arranged directly adjacent to the side stands (22, 24),

- The printing unit side cheeks (80, 82) are supported with a lower section on the side stands (22,24) and the printing cylinder unit (14) after loosening the connection with the Side stands (22, 24) and pivot !, the upper inking module unit (12) in their The disengagement division can be freely removed upwards from the printing unit (10),

- The upper modular inking unit (12) only with an inking roller (42) that comes into contact with the plate cylinder (90) when the modular inking unit (12) is in the working position. is provided, and

- The ink application roller (42) and the associated one Plate cylinders (90) are provided with drive gears (170 or 172) which, when the inking unit module (12) is pivoted, in their working position engage with each other, with their pitch circle diameter are dimensioned so that they the diameters of the rollers driven by them and Cylinder (42 or 90) essentially correspond.

2. Printing unit according to claim 1, characterized in that the printing unit side walls (80,82) and the inking unit side walls (32,34) of the inking unit module unit (12) of different Are thick.

3. Printing unit according to claim 1 or 2, characterized in that the plate cylinders (90, 92) associated dampening units (18, 20) than from the Printing unit (10) removable modular units are formed.

The invention relates to a printing unit for a web-fed rotary offset printing machine according to the preamble of claim 1.

ίο Such a printing unit is from the DE-AS 14 36 541 known This pressure unit is above of the printing unit at least one traverse is arranged. When changing the printing unit, the inking and Dampening of the printing unit in the machine. That The upper inking unit is arranged to be pivotable, but the pivoting range is limited by a pneumatic working cylinder which is only used to adjust the inking unit to the plate cylinder of different diameters. The printing unit must therefore be removed from the side of the printing unit in this device. This training requires special equipment in order to be able to move the printing unit within the printing unit, and also requires certain constructive measures to ensure that the To be able to adjust the rollers and / or drive elements adjacent to the printing unit to adapt to an exchange printing unit of a different size.

All of these restrictions have the practical use of convertibles that can be converted directly in the print shop Make printing units very expensive and cumbersome. What especially for machines for simultaneous Front and back printing applies, with two paper webs arranged one above the other and the paper web at the same time printing blanket cylinders, the egg NEN roll gap between them form through which the Paper web is passed in a substantially horizontal web guide. The complexity of such Rubber-to-rubber printing units - horizontal web feedthroughs made it impossible to Chen means for exchanging the printing unit in the printing unit, although for one

Possibility from the point of view of the application

there was a need

The invention is therefore based on the object of a

To create printing unit for a web-fed rotary offset printing machine, which can be easily manufactured, repaired and can be serviced, and which can be easily and quickly converted in the print shop by removing the printing unit and replacing it with another printing unit

to be able to take into account such different requirements for the printing process.

This object is achieved according to the invention by the features contained in claim 1 It is essential for the invention that the entire Completely modular printing unit is and is designed so that the individual assemblies or modules of the printing unit easily and Have it serviced quickly, removed and / or replaced with an exchange unit. The upper inking unit of the Printing unit is pivotably mounted about a substantially horizontally extending axis, so that it is between a working position, which it assumes during the printing operation, and in which the inking roller of the inking unit is in contact with the adjacent plate cylinder of the printing unit for the transfer of printing ink to the printing unit, and can be moved back and forth in a pivoted position in which the printing unit is freely accessible.

In this position of the inking unit, the printing unit can move in a substantially perpendicular direction from the Printing unit are lifted out, for which conventional lifting equipment can be used, as they normally are provided movable on rails above the printing machine in a print shop. Further Moving the upper inking unit module into its swiveled-out position allows easy replacement and / or repairing the inking unit rollers and other components contained in the inking unit.

The completely modular construction of the printing unit according to the invention enables also the use of side walls or sides cheeks for the individual modules, which are dimensioned so that they offer the module in question sufficient stability and rigidity without incurring any costs excessive use of materials. This means that the printing unit, as the heaviest unit, is the most stable Support required Accordingly, the weighing of the printing unit is relatively thick executed to ensure the required stability. In contrast, the other side wall parts and in particular the main upwardly directed parts thereof are made of material of reduced thickness to lower the material cost. It can of course be the case that a Pressure unit the stability requirements make it necessary to have side wall parts or side walls of different sizes Thickness to use in different places. Such deviations are intended by the claimed Construction to be included.

The modular construction of the printing unit also eliminates one of the most undesirable manufacturing problems of printing units for web-fed rotary offset printing machines, namely the need for a whole Scrap the side stand if there is a tolerance deviation or a wrong hole in the production of the stand has occurred In the training according to the invention, each of the modules is manufactured separately and a Manufacturing defect is limited to a specific module and does not make a total kickstand unusable. In this way, rejects are reduced and labor costs are saved considerably. In addition, the adjustability or adjustability of the individual modules of the printing unit to one another allows the compensation of tolerance deviations that occurred during production.

In the following the invention is described in more detail with reference to the drawings. It shows

Fig. 1 is an essentially schematic side view a printing unit according to the invention seen from the drive side;

F i g. 2 shows an end view of the side stand of the printing unit according to FIG. 1, from the left of the Fig. 1 seen;

F i g. 3 is an end view of the side stand of the printing unit according to FIG. 1, from the right side in Fig, 1 seen;

F i g. 4 is a substantially schematic, exploded view Side view in which the upper inking module unit of the printing unit is swiveled out, the position making the printing unit accessible is shown, the printing unit in the vertically raised position Position can be seen and the two dampening systems have moved out of the side of the printing unit;

F i g. Figure 5 is a generally schematic internal side view of the printing unit. from which the individual modules can be seen with their associated cylinders and rollers;

6 is an enlarged schematic side view the area of engagement between the plate cylinder of a first impression cylinder unit and the inking roller of the upper color module unit; and

F i g. 7 one of the F i g. 6, but in which a second exchange printing cylinder unit is shown is the plate cylinder has a larger diameter than that of the first impression cylinder unit

The printing unit 10 shown in the figures is of modular construction and roughly comprises one upper inking module unit 12, a printing cylinder unit 14, a lower inking module unit 16, so- • -vie an upper and a lower dampening unit 18 and 20. A pair of upright, laterally spaced from each other arranged, irregularly shaped, identical side stands 22 and 24 carries dk> single month

dule der Druckeir.heil 10. As from the following Description will emerge, form the side stands 22, 24 together with the associated side cheeks of the individual modules of the printing unit 10 as a whole, the side walls 26, 28 of the printing unit 10.

These side walls 26,28 carry a series of around their horizontal axes and rotatable cylinders or rollers are made by conventional means, including for example lower transverse ties 30 (see FIG. 5), which extend between the side posts 22, 24, against one another stiffened and kept at the right distance from each other.

In detail, the upper inking unit module unit 12 comprises a pair of spaced-apart, identical inking unit side cheeks 32, 34 which are generally rectangular in shape and, in the illustrated embodiment, consist of about 19 mm thick metal plates. This inking system Seitenwar.gen 33, 34 carry the individual parts of the inking unit module 12, namely an ink fountain 36, an ink fountain roller 38, which is partially arranged within the ink fountain 36, and a roller train 40 including a relatively large inking roller 42, which with a elastic jacket is provided. The roller train 40 comprises a pair of ink fountain rollers 44, 46 which are oscillatable to and fro between the ink fountain roller 38 and a hard, metallic friction roller 48 which is in tangential rolling contact with the inking roller 42. Additional, traversing distribution rollers 50 and 52 are arranged in a similar manner on the circumference of the inking rollers 42 at a distance from one another. Each of the two distribution rollers 50 and 52 is a set ven three weighting rollers 54 _? 56.58 associated with increasing diameters, as shown in FIG. 5 shows an additional weight roller 60 is in tangential rolling contact with the inking roller 42, namely adjacent to the lowermost distribution roller 52 , 34 provided ynd.

The sense and purpose of Waianzuges 40 is the inking roller 42 to provide printing ink and the printing ink on it in such a way evenly to distribute all retransferred from a plate cylinder 90 Images of the print motif are completely eliminated before recolored sections the inking roller 42 again to transfer ink into contact with the plate cylinder 90

the pressure cylinder unit 14 arrive.

From the graphic representations of FIGS. 1, 2 and FIG. 5 shows that the upper modular inking unit 12 is pivotably attached to the printing unit 10, in order to be able to pivot them about a generally horizontal axis. The side stands 22,24 are provided with upright side plates 62, 64, on the insides of which the inking unit-Scitenwangen 32, 34 of the inking unit module unit are directly adjacent 12 are arranged. A pivot shaft 66 is supported in the upright side plates 62, 64 and serves to hold the inking unit side walls 32, 34 in a pivotable manner.

Furthermore, a mechanism 68 for stepless adjustment and / or pivoting of the inking unit module unit 12 is provided on the side stand 24. In addition Mechanism 68 includes a pivot arm 70 attached to pivot shaft 66. A lead screw 72 is articulated to the end of the pivot arm 70 facing away from the pivot shaft 66. These The threaded spindle 72, in turn, is screwed into a nut 74. The nut 74 is about a horizontal axis pivotable and held in place by a block 76 attached to the side stand 24. Finally there is one more Operating handle 78 is provided on the end of the threaded spindle 72 facing away from the pivot arm 70.

As can be easily seen from the drawing, a rotation of the threaded spindle 72 by means of the operating handle 78 causes a corresponding movement of the pivot arm 70 and the Pivot shaft 66; this in turn leads to pivoting of the entire inking unit module unit 12 about the axis determined by the pivot shaft 66.

The printing cylinder unit 14 includes a pair of laterally spaced apart from one another, the cylinder receiving printing unit side cheeks 50, 82, which rest on the upper edge, the side stand 22,24. These side walls are made relatively thick, for example from about 38 mm thick sheet steel, because the relatively heavy printing cylinder unit 14 to achieve the best possible printing result must be supported sufficiently firmly. The illustrated printing cylinder unit 14 comprises a pair of blanket cylinders 84 and 86, which are arranged obliquely one above the other are (see F i g. 5) and together a printing gap between them for the passage and printing of a Form paper web 88 in front and back printing. The printing cylinder unit 14 also has a pair Plate cylinder 90 and 92, one of which is in tangential rolling contact with the associated so Blanket cylinder 84 and 86 respectively, as shown.

The lower modular inking unit 16 is connected to the upper modular inking unit 12 already described essentially identical. The inking unit module 16 has a pair of inking unit side cheeks 94, 96 which are arranged at a lateral distance from one another and which carry the rollers of the inking unit module unit 16 made of about 19 mm thick sheet steel, the middle ice Pivot bolts 98, 100 are pivotably mounted on the side edges 22.24. The inking unit sidewalls 94, 96 are each provided with a keyhole-like slot 101, which serves to accommodate a relatively large, elastic paint application roller 102. The inking unit side walls 94, 96 also serve as a holder for a weighting roller 104 and oscillating distribution rollers 106 and 108, which are in tangential rolling contact with the inking roller 102. Fer The inking unit sidewalls 94, 96, groups of weighting rollers 110, 112, 114.

As best seen in Fig. 5 can be seen wearing the Side stand 22,24 an ink fountain 116, an ink fountain roller 118, reciprocating ink fountain roller ' zen 120 and 122 and a distribution roller 124. Although the overall arrangement of the upper and lower inking unit modules 12, 16 is essentially identical in the case of the lower inking unit module 16, only the specified proportion of rollers is stored in the inking unit side walls 94, 96 of the module.

The part of the entire lower inking unit, designed as an inking unit module unit 16, is Mechanism 126 (Fig. 5) changeable in its position. The mechanism 126 comprises a pneumatic piston: ben cylinder unit 128 with a cylinder 129 and a piston rod 130 extending therefrom. The piston rod 130 is in a threaded cap 132 screwed in, whereby the effective length of the piston rod 130 is adjustable. The threaded cap 132 is in turn articulated in a downwardly directed tab 134, which is part of the inking unit side wall 96. The cylinder 129 is articulated on one Arm 136 Articulated The arm 136 is about a horizontal one Axis pivotable, which is determined by a pivot pin 138 which extends through the side stand 24 A gear 140 is attached to the pivot pin 138 in a rotationally fixed manner. A worm 142 carried by a bracket 144 is in engagement with the gear 140. An elongated, rotatable ' The right rod 146 is attached to the screw 142 and has an operating handle 148 at its other end. Additionally is a pair of threaded provided limit stops 149 attached to the inking unit side wall 94 in order to facilitate a precise setting of the inking unit-müduieinheii IS.

An upper dampening unit 18 is arranged below the upper inking unit 12 to the side of the printing cylinder unit 14. The dampening unit 18 comprises a water tank 150 for receiving a supply of dampening liquid and a pair of water tank rollers 152 and 154 which are in tangential contact with one another both immerse tangentially in the dampening liquid within the water tank 150, and of which the water tank roller 152 is a metallic roller and the The water box roller 154 is a rubber intermediate roller. In addition, there is a metallic transfer roller 156 provided, together with an application roller 158, the elastic jacket of which is in tangential contact with the transfer roller 156 as well as with the adjacent plate cylinder 90 is located

A lower dampening unit 20 is identical to the upper dampening unit 18 and likewise comprises a water tank 159, a water tank roller 161, an intermediate roller 160, and a transfer roller 162 and an applicator roller 164.

The individual parts of the upper and lower dampening units 18 and 20, which are designed in modular form, are each in one extendable, drawer-like frame 166, 168 arranged which can be pulled out of the machine in the horizontal direction. Pneumatic cylinders, not shown, are used around the upper 18 or to move the lower dampening unit 20 into the printing unit 10 or to move it out of it again.

As is familiar to the person skilled in the art, drive elements are provided, with which at least certain of the rollers arranged within the modules of the printing unit 10 can be set in rotation. In the practical

see version, a single drive is provided, which has the appropriate transmission gear Plate cylinder 9P, 92 and blanket cylinder 84, 86 of the impression cylinder unit 14 and the inking rollers 42, 102 and the distribution rollers 50, 52, 106, 108 of the Inking module units 12, 16 drives (the ink fountain w ^ '. Ien 38, 118 of the upper and lower inking module units 12 and 16 are driven by friction from driven rollers). Also the inking rollers 44, 46, 120 that can be moved to and fro and 122 are driven to reciprocate. The individual distribution rollers 50, 52, 106, 108 are apart from the rotational movement, it is also provided with a drive for an axial traversing movement. Finally, there are also separate drive and transmission arrangements for the upper and lower The dampening unit 18 or 20 is provided.

F i g. 6 shows an enlarged, essentially schematic section of the lower part of the upper part Inking unit module unit 12 and the upper part of the impression cylinder unit 14. The only inking roller 42 is shown together with a drive gear 170 connected to it. A gear 172 connected to the plate cylinder 90 is also shown. the Gears 170 and 172 are in meshing engagement with one another. It is essential to emphasize that the pitch circle diameter of the gear 170 is essentially the same as the diameter of the inking roller 42 and the pitch circle diameter of the gear wheel 172 in the Weser''lichen with the effective diameter of the Plate cylinder 90 is identical. The mutual engagement of the gears 170 and 172 serves to change the jacket to bring the inking roller 42 and the plate cylinder 90 into tangential rolling contact with one another.

As already mentioned above, the modular inking units 12 and 16 each have only a single inking roller 42, 102 which is in tangential contact with the adjacent plate cylinder 90, 92. This allows a simple replacement of a Impression cylinder unit 14 against a second impression cylinder unit 14a, which has plate cylinder 90a and blanket cylinder 84a of different diameters. This case is shown in FIG. 7 illustrates, according to which the printing cylinder unit 14a is in use, its Plate cylinder 90a has a larger effective diameter than the plate cylinder 90 shown in FIG is shown. Even with the printing cylinder unit 14a correct the pitch circle diameter of the gear wheel 172a connected to the plate cylinder 90a and that of the im Operation effective diameter of the plate cylinder 90a itself match. In this way there can be a proper engagement between the with the inking roller 42 connected gear 170 and the gear 172a connected to the plate cylinder 90a will.

Conventional inking units generally use a plurality of inking rollers, which are located in Are in contact with a single plate cylinder. As can be readily seen, such an arrangement makes changing the plate cylinder a difficult task since the position of all associated inking rollers must also be changed. The single inking roller 42 used according to the invention, 102, however, together with the gear arrangement described, avoids the need to change any roller positions and therefore facilitates FIG a considerable amount of changeover of the printing unit

If necessary or desired, the upper one

To bring the inking unit module unit 12 out of engagement with the plate cylinder 90, a (not shown) Piston-cylinder unit are actuated to lift the inking roller 42 from the plate cylinder 90, 5 without the associated gears being disengaged from one another. Similarly, a Slight disengagement of the lower inking unit module 16 can be caused by the piston-cylinder unit 128, which is used for the inking roller 102 to pivot in such a way that it no longer has any tangential contact with the plate cylinder 92. These Constructive designs enable a simple and effective change between printing operations and non-printing operation of the printing unit 10.

It can also be seen that the adjustability of the inking module units 12 and 16 in relation to Printing cylinder unit 14 offers a simple possibility of precisely setting the inking unit Modiileinheilen 12. 16 during operation and thus slight dimensional tolerances to compensate that may have arisen during the manufacture of the machine. A driving disengagement of the inking unit modular units 12, 16 can be achieved by Press, d. H. can be made by turning the operating handles 78 and 148, whereby the tooth wheels 170,172 of the inking rollers 42,102 and the Plate cylinders 90, 92 are disengaged from one another.

If it is desired to exchange the printing cylinder unit 14, the printing unit 10 is out of operation taken and the operating handle 78 is operated so that the upper inking unit 12 is pivoted into its, the Pressure cylinder unit 14 is moved accessible position, which is best shown in FIG. 4 can be seen. In this position the upper inking unit module unit 12 can the entire printing cylinder unit 14 in a substantially vertical direction upwards out of the Printing unit 10 are lifted out. This can usually be done by using it from above the machine arranged hoists that can be moved on rails happen as they are common in printing areas.

In addition, in the swiveled-out position of the upper inking unit module unit 12, the rollers can be moved Easily check and replace this inking unit module unit 12. This is especially true for the color Carrying roller 42, which is specially designed for this in the keyhole like slots 61 is held.

When the printing cylinder unit 14 is removed from the printing unit 10, the lower inking unit module unit 16 and in particular its inking roller is also there

102 easily accessible. The latter is also held in keyhole-like slots 101 and can without Difficulties are exchanged if necessary. As mentioned above, an exact Adjustment of the position of the modular part

les of the inking module unit 16 through the piston-cylinder unit 128 and the limit stops 149 be effected.

If a new thin cylinder unit 14a is used it is only necessary to add this new one To bring printing cylinder unit 14a into its position in the printing unit 10 and there by conventional To attach fasteners (not shown). The printing unit 10 is particularly useful of Druckzyündereinheiten 14, 14a with changing Suitable for plate cylinder diameters. The design with a single ink transfer roller facilitates in to a large extent the transition from one thin cylinder unit 14 to another 14a. After the new

: Printing cylinder unit 14a has been used, the

^; ; upper inking module unit 12 back in its ar-

.; ^:; working position swiveled. Due to the fact that

| j a plate cylinder 90 with only two lines of contact

^i; a has application rollers, namely with the inking roller

I 42 and the applicator roller 158 of the dampening unit 18, can

p every practically occurring size of a plate

Insert cylinder 90.

| j The dampening units 18 and 70 can be removed from the side

| jj printing unit 10 can be pulled out. To this

'! Purpose are the dampening units 18, 20 as independent input

j :) units trained and guided on rails, of which

j | they are worn. This also allows the entire

ii Replace th dampening units 18, 20 as desired.

$ From the above description it can be seen that

% the special, inventive design of the pressure

J§ unit 10 a quick and easy conversion and / or

"Repairs at the island made possible without this

'ΐ time-consuming and costly machine downtimes

i'i and delays occur.

i * i A printing unit is specifically used as an exemplary embodiment

£ ■ 10 for a perfecting printing unit described

M. been practiced. The invention can be in the same way

Hi Apply to pressure units in which the pa-

I pier web 88 is only printed on one side. In this case 2s

^: "the printing cylinder unit 14 only needs an upper one

Plate cylinder 90 and an upper blanket cylinder 84 to contain. Only an impression cylinder needs to be provided below the web.

30th

For this purpose 3 sheets of drawings

35

40

45

50

55

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65

Claims (1)

Patent address: 1. Printing unit for a web-fed rotary offset printing machine for variable formats - with two side stands, - One with at least one plate cylinder and one blanket cylinder as well as one for horizontal print material guidance in the underneath the Blanket cylinder arranged impression cylinder provided impression cylinder unit in modular design, which can be exchanged as a whole and connected to the side stands by means of two printing unit side panels and can be brought into engagement with the machine drive, - At least one inking unit arranged above the printing cylinder unit, which as with two inking unit side cheeks provided modular unit formed and pivotable in the Side stand is mounted, - at least one dampening unit,