DE2343102C3 - Rotary printing machine for indirect printing - Google Patents

Description

10. Rotary printing machine according to one of claims 8 and 9, characterized in that the bores (105) in the gears (93) with rolling element guides (106) for play-free recording

me of the coupling pins (104) are equipped.

11. Rotary printing machine according to one of claims 8 to 10, characterized in that the Gears (93) each relative to the part (99) carrying their bearing (97, 98) by a limited amount

Amount are radially movable.

12. Rotaüoiis printing press according to one of the Claims 1 to 11, characterized in that the forme cylinders (21) in the frame block (61) are axially are adjustable.

13. Rotary printing machine according to one of claims 1 to 12, characterized in that on dtr holder (85) fixed bearing blocks (81) for the forme cylinder (21) each on one side of a through the forme cylinder axis (27) and the bracket (85) perpendicularly crossing plane on one Support (86) supported by Absland from the adjacent side of the bracket (85) and through at least one screw bolt (83) are held in contact with this support (86) while on the other side of the plane between the bracket (85) and the respective bearing block (81) a hard one Spring (87) is provided, against which the bearing block (81) by means of at least one further screw bolt (84) is curious.

14. Rotary printing machine according to claim 13,

characterized in that with two bearing blocks (81) arranged next to one another for zv / ei Forme cylinder (21) the supports (86) on the adjacent areas of the two bearing blocks (81) and the springs (87) are provided on the areas of the bearing blocks (81) facing away from one another.

15. Rotary printing machine according to claims 6 and 7 and one of claims 13 and 14, characterized in that the paint roller sets

(72) are arranged on the bearing blocks (81) of the forme cylinder (21).

16. Rotary printing machine according to one of claims 1 to 15, characterized in that a Gear drive for driving the printing unit, a main drive wheel (91), a meshing with this, on the axis of the transfer cylinder (22) seated wheel (92), with this meshing gears (93) for driving the forme cylinder (21), at least one meshing with two gears (93) Intermediate wheel (94) and wheels (95) meshing with the intermediate wheel (94) for driving Contains inking rollers (71).

The invention relates to a rotary printing machine for indirect printing, in particular indirect printing High pressure, with at least two forme cylinders, which are stored with one and the same in a machine frame Transfer cylinder, to which a printing cylinder is assigned, work together, the printing exporting area of the transfer cylinder only

: occupies part of its scope.

A sheet-fed printing machine is known (DT-PS K) O 824), which has two on a transfer cylinder has irbeitende forme cylinder. Both the transfer cylinder and the two forme cylinders are all in the machine frame or foundation Jer machine arranged or stored, each for itself.

Furthermore, a subdivided forme cylinder is known (DT-PS 4 7 i 734). whose parts are adjustable relative to each other. This forme cylinder can be used in a multicolor rotary printing press, with four such forme cylinders working on a transfer cylinder which has two transfer areas in an arrangement diagram. It is a banknote or sheet-fed printing machine with a special mode of operation in which the individual sheets have to pass through the machine twice in different positions.

In the case of a multi-color sheet-fed rotary press, in which one printing unit has two superposed in the stationary machine frame, one Has printing unit cylinders assigned to a common printing cylinder (DT-AS 12 34 736), it is known in a frame inking units that can be moved obliquely upwards from the printing unit cylinders on steep tracks and to store two further printing unit cylinders assigned to the inking units around the machine to be able to equip optionally as letterpress or offset printing machine.

It is also a variable wet offset-dry offset rotary printing press known ("Druckwelt" 29/72 of October 20, 1972, advertisement from Robert Giebeler K.G.), in which three printing units for three colors each form individual units that are set up separately and spaced apart. This is about three separate printing journeyman optionally to be able to equip with printing units and cylinders for different printing processes. This is done as operational aids for the assembly and transport of the elements to be removed or installed Carriages are used, each of which is driven next to the printing units and each of which is a printing unit of the unit in question can record with its cylinders.

In a known rotary machine for the production of chromo, iris and mosaic images (DT-PS 2 81 943) three color cylinders give partial images to one of three fields of a downstream cylinder off, the ink cylinders being lifted from this cylinder when they are not assigned fields of the same pass them. From the cylinder having the three fields the partial images arrive unmixed -oif the forms of a forme cylinder, to which collecting rollers are assigned, in order to color the parts of the shapes into a full image to unite, whereupon the pressure takes place in cooperation with a printing cylinder.

In one embodiment, the three color cylinders are in an angular range that is approximately third part of the circumference and thus approximately the circumferential length of a field of the three fields containing cylinder corresponds. However, this has no particular purpose and is for the way of working the machine is irrelevant, because the three color cylinders each cycle by their own assigned cylinder can be lifted off and employed again at this, so that each color cylinder only ever comes into contact with the same field.

To meet the increased requirements for the Di uckausführung z. B. from Haftetikelten appears In principle, an indirect printing process is very suitable, although apart from the normal offset process (Wet offset process) specifically the indirect letterpress or dry offset process comes. Here, as in other cases, there are still special problems when the Printing should be done in multiple colors. Achieving good registration is extraordinary important. The difficulties that are already committed in this regard increase considerably, if it is a print product, a:>. besides printing there is also an or several other operations, such as. B. punching or gluing are to be carried out, while on the other hand, however the use of a rotary printing process should not be dispensed with.

The object of the invention is to provide a compact web-fed rotary offset printing machine, in particular for indirect letterpress printing, with which flawless multi-color printing is possible and which increased demands on the print quality can be met, with easy accessibility to the cylinders and inking units should be guaranteed.

In a printing press of the type mentioned, the invention provides that the opposite to the Transfer cylinder adjustable forme cylinder in a laterally movable from the machine frame worn gesture blocks are stored and can be coupled to a drive arranged on the machine frame, and that the forme cylinder and the impression cylinder in one of the axis of the transfer cylinder as Vertex measured angle are arranged around the transfer cylinder, which is smaller or is at most approximately equal to the angle that includes the circumferential area of the transfer cylinder not intended for printing.

With the invention, the object is achieved in a particularly advantageous manner and a compact rotary printing press Created for indirect printing that not only takes up little space, but the i.a. also has the great advantage that the frame block is a very rigid and stable unit can be carried out, which then also to achieve a high level of accuracy and flawless Compliance with the required relative position of the parts recorded by it leads. With that it is possible made to achieve excellent printing results without great mechanical effort.

The lateral movement of the frame block ensures that the Parts and the parts remaining in the machine frame after moving the frame block to the side are freely accessible. The arrangement of the forme cylinder and the printing cylinder in an angular range, which corresponds to the circumferential area of the transfer cylinder not intended for printing or smaller than this, not only contributes to the compact design of the machine, but also brings, among other things. also the advantage that there is a position which in particular can form the standstill position of the machine in which neither the forme cylinder nor the impression cylinder with the peripheral frame forming the printing surface of the transfer cylinder is in contact.

The advantages of the invention are achieved in particular when the frame block has four form cylinder

which contains.

A four-color print of high quality can then be achieved in the dry offset process.

A very useful version of the printing machine is characterized by being parallel to the axis of the Horizontal guides running through the transfer cylinder for the frame block.

This makes it possible to move the forme cylinder in the horizontal guides by moving the frame block from a working position on the transfer cylinder od quickly and without external aids. The like. Into a To transfer distance from the transfer cylinder having position.

A particularly stable design results from the fact that the Gcstellblock as a frame Traverses and end-side, at an angle to each other struts is formed, with the struts or bearing blocks for the forme cylinders are arranged with these brackets connected. Lower trusses of the frame block can in particular be part of zo horizontal guides.

In addition to the forme cylinders, the frame block can also contain sets of inking rollers assigned to them, while the ink fountains belonging to the inking roller sets are on $ 2 that are separate from the frame block Side walls of the machine frame are attached. It can also be useful that the To arrange inking roller sets as exchangeable units on the frame block.

Further details and features of the invention emerge from the subclaims. In the The following description and the drawing show exemplary embodiments of the invention. It shows

1 shows a printing machine for processing web-shaped material,

F i g. 2 the arrangement of the cylinders of the printing machine and some parts of the same in schematic form Depiction,

3 shows the block of the printing press in Front view,

F i g. 4 shows a cross section through a guide of the frame block,

5 shows a frame of the frame block without Built-in components in a perspective view in relation to the machine frame,

Fig. 6 the arrangement of drive elements !! the Printing press,

F i g. 7 a coupling between a forme cylinder and an associated drive wheel,

8 is an end view of the drive wheel according to FIG. 7 on a smaller scale,

9 shows a device for adjusting a forme cylinder in the axial direction,

F i g. 10 two bearing blocks for adjacent forme cylinders in a section along the line XH-XIl in FIG. 11,

F i g. 11 the arrangement of a bearing block on a bracket of the Gcstcllblockcs.

The machine 1 shown in Fig. 1 is used to produce adhesive labels from two-day tape material 2, which is drawn off from a roll 3 and runs through the machine in its longitudinal direction. In the way of the strip 2 are successively a punch 4 equipped for example with a steel strip cut with transverse vertical working movement directed towards web 2, a feed device 5 for the web with back and forth h <i movable grippers 5a, a printing device designated as a whole by the number 6, one of the latter associated storage device 7, a feed device 8 with continuously driven feed rollers 8a and a device 9 for pulling off the waste filter resulting from the punching and making up the area between the adhesive labels 10 arranged. The latter is wound into a roll 11, while the carrier material 12 with the finished Hafletiketten the role 13 results.

The above-mentioned parts and devices of the machine 1 can be used individually or in groups be driven or by a not specifically shown, extending in the longitudinal direction of the machine Main shaft can be driven via clutches and the like.

Although the movement of the web 2 by means of the device 5 takes place intermittently, as is the case for the Working of the punch 4 is required, the printing of the web by means of a rotary operating Printing device 6 causes. The transition to a continuous feed movement of the web 2, as they is effected by the device 8, takes place subsequent to the printing process with the aid of the storage device 7th

The illustrated printing device 6 is set up to carry out four-color printing in the dry offset process. As shown in FIGS. 1 to 3 and in particular from FIG. 2, four forme cylinders 21 are arranged around a central transfer cylinder 22 in the manner of a salellite, with a printing cylinder 23 cooperating with the latter. The transfer cylinder 22 is coated on part of its circumference with a material suitable for transferring the printing ink, e.g. B. a rubber blanket, which forms the "printing surface" 24, the circumferential length of which in the embodiment shown is slightly less than half the circumference of the transfer cylinder 22, corresponding to a circumferential angle υ of, for example, 160 ° or 170 °. The remaining part (360 ° -u) of the transfer cylinder 22 is set back radially inward from the printing surface 24 by an amount r, such that this part does not interact with the printing cylinder 23 when the transfer cylinder 22 rotates, but rather a gap opposite it or leaves space, as can also be seen from FIG. In the illustrated embodiment, the forme cylinder 21 and the printing cylinder 23 are also arranged at an angle around the transfer cylinder 22 which is slightly smaller than the angle 360 ° -u which includes the circumferential area of the transfer cylinder 22 not intended for printing. This has the advantage, among other things, that there is a position of the transfer cylinder 22, namely that shown in FIG. 2, in dci, apart from the printing cylinder 23, none of the forme cylinders 21 with which the rubber blanket or the like forming the printing surface 24 is in contact. This position is expediently provided as a standstill position for the printing machine. This can easily be achieved by using the appropriate circuit.

The forme cylinders 21 each have a printing forme 25 fastened to it in an exchangeable manner, for example wise a plastic plate attached to the respective cylinder for the drying process. V01 dic.ic printing forms are part of this on de forme cylinders 21 by suction, i. H. unti Application of negative pressure, held.

The diameter of the forme cylinder 21 are ii Ratio of 1: 2 to the diameter of the Ubcrir μιιημν / ylindcn, 22. The length of the printing formes 25 a

the forme cylinders 21 and the angular position of the latter relative to one another and to the transfer cylinder 22 is chosen so that all of the printing formes 25 one after the other when the printing machine is working Print image with the printing ink on one and the same area, namely the printing surface 24, des Transfer cylinder 22 release. The web 2 thus receives from a single transfer cylinder 22 when passing between this and the printing cylinder 23, an imprint in four colors. It has shown that it is possible in this way, with relatively very little mechanical effort to achieve a four-color print of unexpectedly good quality. The coloring of the printing forms 25 on the Form cylinders 21 are carried out with the aid of inking units assigned to them, which are shown in FIG. 2 only are indicated schematically and denoted by the numeral 26.

Before the web 2 reaches the printing unit, it is over a compensating roller 31 and a stationary roller 37 out, the compensating roller 31 in the direction of the arrow 32 shown in Figure 2 on or in lateral guides 33 can be moved back and forth by a certain amount.

In the illustrated embodiment of the printing machine, the transfer cylinder 22 and the printing cylinder are 23 mounted in a part 14 of the machine frame 15 (FIG. 3), while the one with the transfer cylinder 22 cooperating forme cylinder 21 are combined in a frame block 61 and with form this one unit. The forme cylinder 21 and the transfer cylinder 22 are shown in FIG. 3 without printing forms, Elevators etc shown. In the frame block 61, those associated with the forme cylinders 21 are also in each case Inking rollers 71, each of which are also combined to form inking roller sets 72, are arranged, while the associated ink fountains 73 with ink fountain roller 74 on a vertical part 16 of the Machine frame 15 are attached with not particularly shown conventional fastening means. the Transfer of the printing ink from the ink fountain roller 74 to the ink rollers 71 of the ink roller sets 72 can by means of a not specifically shown lifter of a type known per se or by means of another Element. The arrows 75 in FIG. 3 indicate the transfer movement by a lifter.

The frame block 61 with the forme cylinders 21 and the inking roller sets 72 of the inking unit forms one from the machine frame 15 separable unit. The design is like this in the example shown made that the frame block 61 in guides 66 a horizontal movement transversely to the direction of web travel, i. H. can run parallel to the axis of the transfer cylinder 22. After moving out of the The frame block 61 becomes the working line in its end position through a correspondingly long area held by overlapping guide parts. In the extended position of the frame block 61 are both the transfer cylinder 22 and the impression cylinder 23 as well as all parts of the frame block 61 itself, So the inking rollers 71 and, namely after the removal of the latter, also the forme cylinders 21 Easily accessible so that all necessary work can be carried out without difficulty. This also includes the mounting and removal of printing forms.

F i g. 4 shows an embodiment of the guides 66 of the frame block 61. A with a longitudinal spar 62 of the Frame block 61 firmly connected prism body 67 is supported via roller bearings 68 in a V-shaped Groove 70 of the machine frame 15 from. One in a groove 67a of the prism body 67 with a corresponding fit engaging bar 69 fastened to the machine frame 15 serves in addition to the weight of the frame block 61 as a safeguard against lifting off the guide.

The frame block 61 includes a frame-like

ίο Frame, as Fig.5 shows in principle. The same has cross members 62, 63, which are attached to the front side by struts 64 and arranged at an angle to one another the front side are also connected to one another by an apron 65. The lower traverses 62 can For example, the prism body 67 of a guide of the in FIG. 4 type shown. On the struts 64 are bearing blocks 81 for the forme cylinder 21 directly or above in a manner to be explained Intermediate links attached. Dash-dotted lines are shown in FIG. 5 schematically the machine frame 15 with the with it connected parts 14 and 16 indicated, the arrow 60 indicating the direction of movement of the frame block 61 when moving out of the working position on the transfer cylinder 22 or when moving back into this

»5 indicates work position. The struts 64 are expedient at an angle of 90 ° to each other, so that with a four-color printing unit also the two Axes of adjacent forme cylinders 21 going planes are at such an angle of 90 °, as this from FIG. 3 can be seen.

As the F i g. 10 and 11, two adjacent forme cylinders 21 are each supported in bearing blocks 81 that are also adjacent to one another by means of roller bearings 82. Each bearing block 81 is fixed with screw bolts 83 and 84 on a bracket 85 which is connected to the struts 64 of a frame (FIGS. 3 and 5) of the frame block 61 or can also be formed by this itself. Each bearing block 81 is supported on one side of a plane E passing through the forme cylinder axis 27 and traversing the bracket 85 on a support 86 in the form of a cylinder pin running parallel to the forme cylinder axis 27 at a distance from the underside of the bracket 85. The bearing block 81 is held in contact with this support 86 by the screw bolt 83, while on the other side of the plane E between the bracket 85 and the bearing block 81 a hard spring 87, namely a disk spring assembly, is provided against which the bearing block 81 is tensioned by means of the other screw bolt 84. The cylinder pin forming the support 86 is itself received in correspondingly semi-cylindrical recesses of the holder 85 and the bearing block 81.
The plate spring assembly is selected in its stiffness se that the bearing block 81 perfectly retains its position even under the forces occurring during operation and acting on the forme cylinder 21 while it can give way under exceptional loads, such as when entering several layers of paper (so-called crumple) , s <that damage is avoided. In addition, it is possible, by slightly turning de screw bolts 83, 84 in one or the other direction, a slight pivoting movement of the bearing block 81 about the support 86 as the pivot point ζ, whereby a very sensitive setting de forme cylinder 21 relative to the frame of the frame blocks 61 and so that the transfer cylinder 22 is possible.

709 643/274

The bearing blocks 81 are also still with a support surface 88 for the ink rollers 71 containing Color roller sets 72 are provided, as shown in FIG. 11 recognize Thus, when the forme cylinder 21 is adjusted by adjusting the bearing blocks 81, the Inking rollers 71 of this adjustment movement, their position relative to the forme cylinder 21 remaining unchanged. The fixing of the ink roller sets 72 on the bearing blocks 81 can be done with the help of screws, Throw-over brackets or other suitable elements that are available to the skilled person and are not specifically shown.

The arrangement of some drive elements for the printing press is partially schematic in FIG An electric motor 90 rotates a main drive gear 91 which is connected to one on the axis of the Transfer cylinder 22 seated wheel 92 meshes. With this centrally located wheel 92 there are four Forme cylinder drive wheels 93 in engagement, two of which engage in an intermediate wheel 94, which in turn with two wheels 95 for the drive of inking rollers 71 is in engagement. With all of the above Wheels are helical gears.

The main drive wheel 91, on the other hand, is still in engagement with a further gearwheel%, on the axis of which the cam 35 sits, which controls the reciprocating movement of the compensating roller 31 in the working cycle of the printing device, as has already been explained above

In Figure 7 the bearing is of a form cylinder drive wheel 93 shown in detail in larger scale, the drive wheel 93 is mounted on a bearing pin 99 with the aid of bearings 97, 98, the larger in diameter part 100 has an external thread and with this in a In the machine frame part 16 seated threaded bushing 101 is screwed.By turning the bearing pin 99 in one direction or the other, the thread results in an axial displacement, which, due to the helical teeth of the gears 93 and 92, a rotation of the wheel 93 relative to the wheel 92 and thus a slight Angular adjustment of the wheel 93 takes place. Since the associated forme cylinder 21 can be coupled to the wheel 93 in an unchangeable angular position, as will be explained below, a very sensitive angular adjustment of the forme cylinder 21 relative to the transfer cylinder 22 can be carried out. This applies to each of the existing forme cylinders 21. A lock nut 102 screwed onto the external thread 100 serves to secure the set position.

The roller bearing 97, 98 of the drive gear 93 is designed in such a way that this wheel 93 can be moved radially by a limited amount, that is to say transversely to the axis of the bearing journal 99. This serves to facilitate coupling of the drive wheel 93 with a coupling part 103 fastened on the axis 27 of the associated forme cylinder 21 and to bridge adjustment movements of the forme cylinder 21 or its mounting in the frame block 61 and relative to the transfer cylinder 22.

In the embodiment shown, the coupling part 103 has two protruding coupling pins 104 which each have different distances a and b from the central axis of the forme cylinder 21. In the drive state 93, two bores 105 are provided at corresponding distances from its axis, which in this exemplary embodiment are formed by roller body guides 106 with upstream guide caps 107 serving to facilitate the insertion of the coupling pins 104 . The coupling pins 104 are provided with tapered ends at the front.

ίο If in an embodiment with frame block 61 movable on guides, as shown as an example in FIGS. The frame block is represented 3 to 5 61 moved out of its working position on the transfer cylinder 22, including the coupling pins 104 come simultaneously disengaged from the drive gear 93. When pushing back the frame block 61 in the working position and the coupling pins 104 slide back into the Ball guides 106 formed bores 105 in the drive gear 93

ίο and the drive connection is restored. The different distances a, b of the two coupling pins 104 from the forme cylinder axis 27 in conjunction with the correspondingly arranged bores 105 in the drive gear 93 ensure that the coupling engagement can only come about at a very specific angular position of the forme cylinder 21 relative to the drive gear 93. Since the drive gears 93 in turn mesh with the central wheel 92 for the transfer cylinder 22, they cannot experience any arbitrary and undesired change in their angular position. This ensures that, in spite of the fact that the frame block 61 can be moved out of its working position, a correct positional assignment of all elements involved in the printing process is always achieved.

The transmission of a rotary movement from the gears 95 (Fig. 6) to the inking rollers 71, which in the Frame block 61 are arranged and are therefore traversed with this, also takes place in each case by means of a Coupling, which can be designed very simply. In an expedient embodiment, the to be driven inking roller 71 at one end of its axis has a coupling sleeve with one of a pin traversed axial opening into which a drive pin provided with a transverse slot at the end can intervene, which sits on the axis of the relevant gear 95 or through the end of this axis itself is formed. In addition, other coupling options are also conceivable.

F i g. 9 illustrates an embodiment of a forme cylinder mounting which enables the forme cylinder 21 to be adjusted in its axial direction. Ball bearings 112, 113 are provided on both sides of a disk 111 connected to the form cylinder axis 27 for the radial and axial mounting of the forme cylinder, these ball bearings being located in a housing 114 which, for example, has a square or rectangular outer cross-section and in a guide 115 with a corresponding cross-sectional shape i a bearing block 81 or the like by means of a threaded spindle 117 engaging in a threaded bushing 116 on a stationary part with a handwheel.

See S sheet drawings

Claims (9)

Patent claims: 1. Rotary printing machine for indirect printing, in particular indirect letterpress printing with at least two forme cylinders that work together with one and the same transfer cylinder stored in a machine frame to which a printing cylinder is assigned, the printing surface of the transfer cylinder only part of its circumference occupies, characterized in that the forme cylinders (21) adjustable with respect to the transfer cylinder (22) are mounted in a laterally displaceable frame block (61) carried by the machine frame (15) and with a drive (91 to 95) arranged on the machine frame (15) can be coupled, and that the forme cylinder (21) and the printing cylinder (23 ) are arranged around the transfer cylinder (22) at an angle measured as a vertex from the axis of the transfer cylinder (22), which is less than or at most approximately equal to the angle (360 ° - u) , which covers the circumferential area of the transfer cylinder (2 2) includes. 2. Rotary printing machine according to claim 1, characterized in that the frame block (61) contains four forme cylinders (21). 3. Rotary printing machine according to one of claims 1 and 2, characterized by parallel to the axis of the transfer cylinder (22) extending horizontal guides (66) for the frame block (61). 4. Rotary printing machine according to one of claims 1 to 3, characterized in that deir Frame block (61) as a frame with traverses (62, 63) and one end at an angle to one another Struts (64) is formed, with brackets (85) connected to the struts (64) or Bearing blocks (81) for the forme cylinder (21) are arranged. 5. Rotary printing machine according to claims 3 and 4, characterized in that the lower Traverses (62) of the frame block (61) is part of the horizontal guides (66). 6. Rotary printing machine according to one of claims 1 to 5, characterized in that the Sets (72) of inking rollers (71) assigned to forme cylinders (21) are arranged on the frame block (61) are, while the ink fountain (73) belonging to the ink roller sets (72) is attached to the frame block (61) separate side walls (16) of the machine frame (15) are attached. 7. Rotary printing machine according to claim 6, characterized in that the ink roller sets (72) are arranged as exchangeable units on the frame block (61). 8. Rotary printing machine according to one of claims 1 to 7, characterized in that in or on the machine frame (15, 16) mounted drivable gears (93) of the forme cylinder drive each have at least two parallel to its axis directed bores (105) and to the Form cylinders (21) or their axes (27) are each provided with coupling pins (104) which run parallel to the form cylinder axis and can be inserted into the bores (105) of the gearwheels (93). 9. Rotary printing machine according to claim 8, characterized in that at least two coupling pins (104) have different distances (u, b) from the forme cylinder axis (27) and the associated bores (105) in the gears (93) correspondingly different distances ( a, b) from the wheel axle.