EP0433622B1 - Printing machine with pressure rollers including an exchangeable pressure sleeve - Google Patents

Description

The invention relates to a printing press with at least one impression roller, which is provided with an interchangeable sleeve-shaped impression roller jacket and is provided with detachable bearings in such a way that it is freely cantilevered in the machine frame in the region of its one journal in order to change the impression roller jacket.

In a printing machine of this type known from DE-PS 35 00 319, a bearing can be detached by pulling it off a shaft journal of the impression roller with the associated bearing block, which is displaceably guided on guide rods. After the bearing has been pulled off, it can then be swiveled together with the bearing block after loosening the guide rods from a supporting side wall by means of a swivel bracket, so that the impression roller held in the other undissolved bearing between an extendable support shell and a retractable support yoke for the purpose of exchange the impression sleeve can be removed. In the known printing press, the devices for removing a bearing and for freely cantilevering the impression roller in the other bearing are relatively complex. Furthermore, the complete removal of a bearing with the associated bearing block from a shaft journal requires Presseurs made a complete breakthrough through a side wall supporting the impression roller, which, if it should be possible at all for design reasons, leads to a weakening of the side wall and thus of the machine frame.

The object of the invention is therefore to provide a printing press of the type specified at the outset, which enables the replacement of a press cover in a simple manner.

According to the invention, this object is achieved in a printing press of the generic type in that the bearings consist of folding bearings with hinged bearing shells which, after being released, allow the impression roller to pivot out in a horizontal plane that one side of the impression roller is extended with one over the associated folding bearing Shaft journal is provided, on the upper end region of which a support shell is supported, which is rotatable about a vertical axis in the machine frame but is axially immovable, and that a movable horizontal support rail or slideway is provided, which is connected to the impression roller or a shaft part connected to it the bearings can be adjusted and locked from below, so that the impression roller held between the support shell and the support rail can be pivoted out of the open folding bearings about the vertical pivot axis of the support shell. The printing press according to the invention thus allows a replacement of a impression roller jacket in a simple manner in that devices are provided which hold the impression roller after opening the folding bearing and allow its pivoting about a vertical axis provided near a folding bearing, so that it swings out and projects freely held impressioner in its inclined position can remove the impression jacket for its exchange.

The folding bearings are of a known design and allow the bearings to be opened and closed quickly. When swiveling out, the impression roller is rotated about the vertical axis of the support shell, the slideway of the support rail positioned against the impression roller forming the other abutment to the support shell.

The support shell can consist of a shell of a plain bearing, so that it does not have to be removed even during printing.

The support rail is expediently held on the end region of a support lever which is pivotably mounted in the machine frame and which can be pivoted between its pivoted-out holding position and its folded-in ready position by means of a support device. The support rail can be attached to the piston rod of a pressure medium piston-cylinder unit. Furthermore, the support lever carrying the support rail can also be pivoted by a pressure medium-piston-cylinder unit.

The support device expediently consists of a toggle lever system, one end of which is mounted on the support lever and the other end of which is mounted on the machine frame and which can be blocked in its extended position holding the lever in its support position. One of the toggle levers is expediently provided with a groove, between the legs of which the other toggle lever is mounted, so that the other toggle lever partially dips into the groove in the folded position. This configuration enables a space-saving arrangement of the support device, since the toggle lever support lever system forming a four-joint system can be folded in such a way that the support lever in the folded position parallel to the outer toggle lever.

In a further embodiment of the invention it is provided that the support lever and the toggle lever system are arranged in the recess of a side part of the machine frame in such a way that they can be folded into this recess in the ready position. This configuration enables a space-saving construction, whereby side parts of the machine frame do not have to be weakened by openings.

The outer toggle lever is expediently fastened to a shaft which is mounted between fork-shaped bearing pieces and is connected to an actuating lever by means of which it can be pivoted between the support position and the inoperative position of the toggle lever support lever system. The actuating lever can be fastened to the shaft by a ring which is provided with a locking bolt which can be locked in the support position and in the rest position in corresponding locking holes in a bearing piece, so that the rest position and the support position are secured.

Fig.1

eine Seitenansicht einer Lagerung eines Presseurs in einem Seitenteil einer Druckmaschine bei gelöstem Klapplager und an den Presseur angestellter Stützschiene, also eine Stellung des Presseurs, in der dieser einendig frei auskragend gehalten ist,

Fig.2

eine der Fig.1 entsprechende Seitenansicht, bei der das Klapplager geschlossen und die Stützeinrichtung in ihre Ruhestellung eingeklappt ist,

Fig.3

eine Ansicht der Stützeinrichtung gemäß der Schnittlinie III-III in Fig.1

Fig.4

einen Schnitt durch einen Kniehebel des Stützsystems,

Fig.5

einen Schnitt durch den Kniehebel längs der Linie V-V in Fig.4

Fig.6

einen Schnitt durch das Stützsystem längs der Linie VI-VI in Fig.1

Fig.7

eine Ansicht eines Klapplagers längs der Schnittlinie VII-VII in Fig.6.

An embodiment of the invention is explained below with reference to the drawing. In this shows

Fig. 1

1 shows a side view of a bearing of a impression roller in a side part of a printing press with the hinged bearing released and the support rail attached to the impression roller, that is to say a position of the impression roller in which it is cantilevered on one end

Fig. 2

1 shows a side view corresponding to FIG. 1, in which the folding bearing is closed and the support device is folded into its rest position,

Fig. 3

a view of the support device according to section line III-III in Fig.1

Fig. 4

a section through a toggle of the support system,

Fig. 5

a section through the toggle along the line VV in Fig.4

Fig. 6

a section through the support system along the line VI-VI in Fig.1

Fig. 7

a view of a folding bearing along the section line VII-VII in Figure 6.

On the left side frame 1 of a gravure printing press, not shown in the whole, a plate 2 is firmly screwed from the inside in a manner not shown. This plate 2 carries, in a manner known per se, a folding bearing 3 in which the shaft journal 4 of an impression roller 5 is mounted. The side frame, not shown, opposite the side frame of the gravure printing machine also has a plate which carries a folding bearing for receiving the right-hand shaft journal. In this respect, both side frames are constructed identically. However, the shaft journal 4 of the left side of the impression 5 is extended and protrudes into a recess 6 of the side frame 1. On this elongated shaft journal 4, a slide bearing part 7 is placed from above, which is firmly connected to a journal 8. The latter is rotatably mounted in a bracket 9 which is firmly connected to the side frame 1. The forces acting on the slide bearing part 7 are supported on the bracket 9 via a thrust bearing 10.

In addition to the console 9, a holder 11 is firmly connected to the side frame 1 by means of screws 12. On this holder 11, the two freely running legs 14 and 15 of a U-shaped arm 16 are articulated via the bolt 13. At the end of the arm 16 facing away from the bolt 13, a further bolt 17 is mounted in the two legs 14 and 15 and carries a lever 18 freely pivotable in the region between the legs 14 and 15. The latter is mounted on its end facing away from the bolt 17 via a further bolt 19 so that it can rotate freely in a link 20. As shown in FIG. 4, this handlebar consists of a solid piece into which a channel 21 is milled, the depth of which decreases towards its bearing bore 22. In the bearing bore 22, a shaft 23 is inserted, which is firmly connected to the handlebar 20 via a roll pin 24, which is inserted into the bore 24 '. The shaft is rotatably supported on both sides of the link 20 in holders 25 and 26 which are firmly connected to the side frame 1. In the area of the holder 26, the shaft 23 protrudes outward from the holder 26, a knob 28 being firmly attached to the projecting part 27 of the shaft 23. Furthermore, the holder 26 has two locking bores 29 and 30 (see FIGS. 1 and 2), a locking bolt 31 assigned to the knob 28 snapping into one of these two locking bores 29 and 30 depending on the angular position of the knob 28. In the case of FIGS. 1 and 3, the position of the knob 28 relative to the holder 26 is accordingly secured via the locking bolt 31 and the locking bore 30. As can also be seen from the figures, the U-shaped lever 16 has at its end facing away from the side frame 1 a running rail 32 which bears against a shoulder 33 of the impression roller 5 from below.

The impression roller 5 can thus be pivoted around the pin 8 after the folding bearing 3 has been released and the folding bearing, which is associated with the side frame (not shown), has been released. whereby the pressure cylinder supports itself on the one hand via the shaft journal 4 on the bracket 9 and on the other hand on the running rail 32. The pivoting-out movement of the impression roller 5 is limited by a stop 34 provided on the running rail 32. In this end position, a sleeve-shaped impression roller jacket can then be exchanged for another. After this has been done, the pressure cylinder is pivoted back into the basic position shown in FIG. 6 and the folding bearing 3 and the folding bearing (not shown) on the other side are closed. The locking bolt 31 is then released and pivoted counterclockwise into the shaft 23 via the knob 28 until the knob 28 assumes the position shown in FIG. 2. In this position, the angular position of the knob 28 and thus that of the shaft 23 is secured via the locking bolt 31 and the locking bore 29. During this pivoting movement, the handlebar 20 is pivoted up from its position shown in FIG. 1 into the position shown in FIG. 2, the lever 18 partly lying in the milled channel 21 of the handlebar 20, i.e. the lever 18 is around the Bolt 19 has been pivoted downwards. This pivoting movement has at the same time caused that the U-shaped arm 16 has also been pivoted downward around the bolt 13 of the holder 11, so that the U-shaped arm 16 is also immersed in the recess 6 of the side frame 1 (see FIG. 2 ). As a result, the entire device, which enables a swiveling out of the impression roller for the purpose of changing sleeve-shaped impression sleeve jackets, is immersed in the recess 6 at normal pressure, so that it does not have a disturbing effect on the installation space.

In Figure 1, the folding storage 3 is shown open, whereas in Figure 2, the folding storage is closed. This folding bearing 3 is shown in side view in FIG. It's closed recognize that the folding bearing consists of a fixed part 35 and a pivotable part 36, the pivot point of the pivotable part 36 being designated 37. If the front part 36 of the folding bearing 3 is pivoted up using a handle 38, the locking pin 39 lies in the recess 40 of a locking lever 41, which is held by a compression spring 42 against a stop 43. Since the folding bearing shown schematically in FIG. 7 is known per se, so that a further description is not necessary.

The described releasable mounting of the impression roller is particularly suitable for impression rollers of gravure printing machines, since these work at significantly higher pressures than flexographic printing machines. The bearings described do not require breakthroughs in the side parts of the machine frames, so that weakenings are avoided.

Claims (8)

1. A printing machine with at least one pressure roller (5) which is provided with an exchangeable sleeve-shaped pressure roller cover and is provided with releasable bearings (3) in such a way that for changing the pressure roller cover, it is held in the zone of one of its journals (4) to project freely in the machine frame (1),
   characterized in that
   the bearings consist of hinged bearings (3) with bearing shells (36) that can be opened up, which after their release allow the pressure roller (5) to be swung out in a horizontal plane, that one side of the pressure roller (5) is provided with a journal (4) that is extended beyond the associated bearing (3), on whose upper end zone there bears a supporting shell (7) which is mounted in the machine frame for rotation round a vertical pin but is secured against axial displacement, and that provision is made for a movable horizontal supporting rail (32) or slide path which can from below be applied to or be fixed in position against the pressure roller (5), or a shaft portion (33) connected thereto, between the bearings (3), so that the pressure roller (5) held between the supporting shell (7) and the supporting rail (32) can be swung out of the opened hinged bearings (3) round the vertical pivot pin (8) of the supporting shell (7).
2. A printing machine according to claim 1, characterized in that the supporting shell (7) is a shell of a slide bearing.
3. A printing machine according to claim 1 or 2, characterized in that the supporting rail (32) is held at the end zone of a supporting lever (16) that is pivotably mounted in the machine frame (1), which is pivotable by a supporting device (18 to 29) between its swung out holding position (Figure 1) and its folded-in ready position (Figure 2).
4. A printing machine according to one of claims 1 to 3, characterized in that the supporting device consists of a knee lever system (18, 19, 20), one end whereof is mounted on the supporting lever (16) and whose other end is mounted in the machine frame (1) and which is lockable in its stretched position which holds the lever (16) in its supporting position.
5. A printing machine according to one of claims 1 to 4, characterized in that one of the knee levers (20) is provided with a groove (21), between whose sides the other knee lever (18) is mounted, so that in the folded-in position, the other knee lever (18) partly enters into the groove (21).
6. A printing machine according to claim 4 or 5, characterized in that the supporting lever (16) and the knee lever system are arranged in the recess (6) of a side part (1) of the machine frame in such a way that in the ready position, they can be folded into this recess.
7. A printing machine according to one of claims 4 to 6, characterized in that the outer knee lever (20) is secured on a shaft (23) which is mounted between fork-shaped bearing components (25, 26) and is connected to an actuating lever (28) by means of which it can be swung between the supporting position and the rest position of the knee lever-supporting lever system.
8. A printing machine according to claim 7, characterized in that the actuating lever (28) is secured on the shaft (23, 27) by a ring that is provided with a detent bolt (31) which can be engaged in the supporting position and the rest position in corresponding engagement bores (29, 30) of a bearing component (26).

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