EP0625423B1 - Printing unit with skewing and stopping device - Google Patents

Description

The present invention relates to a printing unit with rotating Printing unit cylinders.

A printing unit has a large number of rotating ones Printing unit cylinders. An offset printing unit comprises e.g. one Plate cylinder and a blanket cylinder. The plate cylinder and the blanket cylinder are on their opposite Ends rotatably mounted in the printing unit frame. Of the Plate cylinder applies a printing plate with a surface which defines a colored image, and which Blanket cylinder carries a printing blanket. During the Cylinder rotation in the printing unit is transferred to the Plate cylinder located on the colored image that is on the blanket cylinder at a gap between the Plate cylinder and the rubber blanket cylinder. The blanket on the blanket cylinder consequently transfers the colored image to the material that is currently being printed, e.g. be a paper web.

A printing unit normally comprises an inclination device, around the plate cylinder opposite the blanket cylinder slant. If the plate cylinder against the Blanket cylinder is tilted, the changes Angular position of the plate on the plate cylinder with respect to itself rubber blanket located on the blanket cylinder. The angular position of the colored image, which from the plate onto the rubber blanket - and thus on the web - is also transferred changed. By adjusting the inclination device the Alignment of the image with respect to the web adjusted.

An offset printing unit also includes a storage device. If the printing plate and / or the printing blanket has been serviced or need to be replaced, the cylinders are in the brought each parking position. Once the cylinders are in Parking position, they are spaced from each other, to access the printing plate, blanket and web receive.

EP 0 105 477 discloses a printing unit Rotary printing machine with a tilt and one Parking device, in which the printing unit cylinders are still with Bearings are provided. To the contact pressure between inclined plate cylinder and with it cooperating blanket cylinder will be constant the distance of the axes of rotation when the Plate cylinder largely relative to the rubber cylinder kept unchanged.

EP 0 193 012 A2 relates to a printing unit, the printing unit cylinder are also provided with bearer rings. With this solution is the parking of the printing unit cylinders from each other Spring packets caused by means of the spring force of the The cylinders become spring assemblies that act against the drive returned to their juxtaposed position.

The object of improvement on which the invention is based an inclination and storage device of a printing unit a rotary printing press, is according to the invention by Features of claim 1 solved.

The storage device moves the first and the second Printing unit cylinders towards and away from each other. This Parking device includes a motor means to the first and the second carrier opposite the frame move. The motor mean is between the first and connected to the second carrier and comprises a first Adjusting means, which is in connection with the first carrier second actuating means in connection with the second carrier stands, as well as a means to the first and the second adjusting means to shift in relation to each other.

In a preferred embodiment of the present invention the first printing unit cylinder is an upper plate cylinder and the second printing unit cylinder is a lower plate cylinder. A upper blanket cylinder is next to the upper plate cylinder arranged, and a lower blanket cylinder is next to that lower plate cylinder arranged. If the Incline the first carrier opposite the frame moves, the upper plate cylinder is compared to the upper Blanket cylinder inclined. If the Incline the second carrier opposite the frame moves, the lower plate cylinder is opposite the lower blanket cylinder inclined.

The first adjusting means provided in the motor means is an actuating cylinder loaded with a pressure medium. The second actuating means provided in the motor means a piston rod that is movably mounted in the actuating cylinder is and so reacts to pressure in the actuating cylinder. Of the Actuating cylinder is pivotally connected to the first carrier, and the piston rod is pivotable with the second bracket connected. If the actuating cylinder is pressurized, whereby the piston rod moves, the carriers become Parking shifted with respect to each other. Also be the actuating cylinder and the piston rod opposite the supports pivots when these beams from the inclination device be moved. Thus, the parking facility with the Carriers connected in such a way that these carriers are independent can be inclined from each other while still remain connected to each other via the parking facility.

According to the present invention, the Inclination device further a socket and a support means. The first carrier can be pivoted about an axis by means of the bushing stored. The first carrier is like this by means of the support means stored that he is in sliding contact with the proppant in moves in a direction that is transverse to the axis. The Inclination device swivels the first carrier around the axis and moves it - with sliding contact with the proppant - at the same time across.

In the preferred embodiment of the present invention the first carrier moves the end of the upper plate cylinder on a circular path that is centered on the Has axis of rotation of the upper blanket cylinder when the first Beam swiveled around the axis and at the same time under Sliding contact with the support means is moved transversely to it. The Proppant is preferably a wedge that is used for the purpose Pressure setting between the first and second beams is displaceable transversely to the first carrier, the Surface pressure between the printing plate and the printing blanket the gap between the upper plate cylinder and the upper one Adjusted blanket cylinder. Appropriate wedges are between the other printing unit cylinders.

Furthermore, the preferred embodiment of the present comprises Invention for the storage of one end of the lower Blanket cylinder a third carrier. The weight of the third Carrier is supported on the second carrier, so that the third carrier is moved down from the second carrier, when the second carrier moves down from the piston rod becomes. The third carrier and the lower blanket cylinder, the is stored on the third carrier, thus fall under the Gravity down into a parking position when the second carrier and the lower plate cylinder from the Piston rod are brought into the respective parking position.

Fig. 1

zeigt eine schematische Ansicht eines erfindungsgemäßen Druckwerks,

Fig. 2

zeigt Teile der in Fig. 1 abgebildeten Einrichtung,

Fig. 3

zeigt andere Teile der in Fig. 1 abgebildeten Einrichtung, und

Fig. 4

zeigt weitere Teile der in Fig. 1 abgebildeten Einrichtung.

The present invention with all of its features is explained in more detail below to the person skilled in the art on the basis of the description of a preferred embodiment and the associated drawings.

Fig. 1

shows a schematic view of a printing unit according to the invention,

Fig. 2

shows parts of the device shown in Fig. 1,

Fig. 3

shows other parts of the device shown in Fig. 1, and

Fig. 4

shows further parts of the device shown in Fig. 1.

A printing unit 10 according to the invention is shown schematically in FIG. 1 shown. It can e.g. a lithographic Act offset printing unit with which both sides of a web 12th be printed. The printing unit 10 includes an upper one Plate cylinder 14 and an upper blanket cylinder 16, the is provided above the web 12, and a lower one Plate cylinder 18 and a lower blanket cylinder 20, the is provided below the web 12. The cylinders 14-20 are rotatable in the part consisting of two side walls 22 stored, with a side wall is shown in Fig. 1. A Motor 24 drives a gear train (not shown) that with the cylinders 14 - 20 is connected so that these - as indicated in Fig. 1 by arrows - turn. Motor 24 and Wheel train can be designed according to the prior art.

The upper plate cylinder 14 carries a pressure plate, which is a too printing image defined. The pressure plate 30 is as a thin one Sheet formed and so on the upper plate cylinder 14 stored by this around the upper plate cylinder 14th is wound around. A locking means 32, which in the upper Plate cylinder 14 is provided, the pressure plate 30 stops this upper plate cylinder 14 fixed. The upper Blanket cylinder 16 carries a printing blanket 34, which acts as a sleeve is formed, which in turn on the upper blanket cylinder 16 is mounted so that this sleeve telescopically over the upper blanket cylinder 16 slips. Another tubular one Blanket 36 is correspondingly on the lower blanket cylinder 20 stored; and locking means 40 secures one other printing plate 38 is on the lower plate cylinder 18th

When the cylinders 14-20 through the engine 24 and Rotate gear train, both pressure plates 30, 38 with color to form the colored images on it. The inked image on the upper printing plate 30 is on the the gap between the upper plate cylinder 14 and the upper one Transfer blanket cylinder 16 provided blanket 34. Consequently the top blanket 34 transfers the inked image to the upper side of the web 12 at the gap 44 which is from the upper and the lower blanket cylinder 16, 20 is formed. The lower one Printing plate 38 transfers the colored image to the lower one Printing blanket 36 at the gap 46 which is from the lower Plate cylinder 18 and the lower blanket cylinder 20 are formed becomes. Thus, the lower blanket 36 transfers the inked Picture at the gap 44 on the lower side of the web 12. Das Printing unit 10 thus prints on both sides of the web at the same time 12th

As illustrated in FIG. 2, the printing unit 10 further comprises a plurality of beams attached to a side wall 22 on one End of the pressure cylinder 14-20 are stored. A first carrier 50 is connected to the upper plate cylinder 14. A second Carrier 52 is connected to the upper blanket cylinder 16. A third carrier 54 is with the lower plate cylinder 18th connected, and a fourth bracket 56 is connected to the lower one Blanket cylinder 20 connected. For parking and tilting the printing unit cylinders 14-20 are the carriers 50-54 to one another slidably arranged. A corresponding arrangement of Carrier is with the opposite ends of the Printing unit cylinders 14-20 with the other side wall 22 connected. The other carriers are for parking - but not for inclination - movable relative to each other arranged as described above.

The first carrier 50 has a substantially circular shape Main section 60 and a web section 62, which itself extends horizontally to section 60. The web portion 62 of the first beam 50 has a curved lower surface 64 that faces the second carrier 52. The main section 60 of the first carrier 50 is on a bushing 65 in the side wall 22 stored. The bush 65 defines an upper stop axis 66. The first carrier 50 is displaceable relative to the side wall arranged that this pivoted about the upper storage axis 66 can be.

The upper plate cylinder 14 has a central axis 68 and is so mounted in a bearing 70 that it is about this axis 68th turns. This bearing 70 is on the main section 60 of the first Supported 50 to deal with this with respect to the To move side wall 22. The upper plate cylinder 14 will thus supported by the first carrier to engage with the first Moving the carrier with respect to the side wall 22.

The second bracket 52 is attached to the side wall 22 and carries a bearing 74 in which the upper blanket cylinder 16th is rotatably supported about its central axis 76. The upper Blanket cylinder 16 is thus on the second carrier 52 on the Sidewall mounted, with the axis 76 of the second carrier in is fixed with respect to the side wall 22.

A first wedge arrangement 80 is also on the second carrier 52 and a second wedge assembly 82. The first Wedge assembly 80 includes a first wedge 84 and one Threaded rod 86, which passes through a through hole in the second carrier 52 is sufficient. The first wedge 84 is on the Rod 86 stored and when rotating the rod 86 relative to the second carrier 52 horizontally displaceable. Corresponding second wedge assembly 82 includes a second wedge 88 and a threaded rod 90 passing through a through hole extends into the second carrier 52. When turning the rod 90 in with respect to the second support 52, the second wedge is 88 horizontally displaceable to this support 52. To turn the A handle 92 is provided on the rod 90.

The third carrier 54 is analogous to the first carrier 50 formed and has a substantially circular Main section 94 and an elongated web section 96, which extends horizontally to this main section 94. Of the Web portion 96 of the third carrier 54 has a curved top surface 98 opposite the fourth beam. Of the The main section 94 of the third carrier 54 is in the socket 99 the side wall 22 attached. The socket 99 defines a lower one Abstellachse 100. The third carrier 54 is in relation to the Sidewall 22 is pivotable about the lower storage axis 100 stored.

The lower plate cylinder 18 includes a central axis 102 and is rotatably supported in a bearing 104 about the axis 102. This Bearing 104 is on the main portion 94 of the third bracket 54 provided to face up to this third carrier 54 To move side wall 22. The lower plate cylinder 18 is thus mounted on the third carrier 54 so that it with this is slidably disposed with respect to the side wall 22.

The fourth carrier 56 is supported in the side wall 22 in such a way that he is in relation to this side wall 22 by a A bearing 112 is pivotable between the stop axis 110 and has a bearing 112 in which the lower blanket cylinder 20 around the central Axis 114 is rotatable. The lower blanket cylinder 20 is over the fourth carrier 56 is mounted so that this with the fourth Carrier 56 is arranged movable relative to the side wall 22.

There is also a third wedge arrangement on the fourth carrier 56 120 is provided, which is analogous to the first wedge arrangement 80 is formed and includes a third wedge 122, so is mounted on a threaded rod 124 so that it is horizontal with this is displaceable relative to the fourth carrier 56. This fourth carrier 56 also has a curved upper surface 126, which is opposite the second carrier 52, and one End stop 128 on. This end stop 128 is located compared to an adjustable limiting means 130, which on the Side wall 22 is provided.

An actuating cylinder 140 is pivotable with the first carrier 50 in connected to the vicinity of the outer end of the web portion 62, such as illustrated in Fig. 2. A piston rod 142 is of that Actuating cylinder 130 is pivotable with the third bracket 54 in connected to the vicinity of the outer end of the web portion 96. A Parking control means, shown schematically in Fig. 2 is, controls the pressure in the actuating cylinder 140. Das Parking control means 150 can be a corresponding device include the operator of the printing unit 10 to move the Piston rod 142 can be operated as desired, so that these can be moved in and out of the actuating cylinder.

When the web in the printing unit 10 - as shown in Fig. 1 - prints the carriers 50-56 take the ones indicated in FIG Positions. The curved top surface 64 on the first Carrier 50 is located on the first wedge 84, which on the second carrier 52 is provided. The top on the top Plate cylinder 14 provided pressure plate 30 is then against the upper one provided on the upper blanket cylinder 16 Blanket 34 pressed, causing ink on this top blanket 34 is transmitted.

The between the surfaces of the upper pressure plate 30 and the upper blanket 34 at the gap 42 (Fig. 1) prevailing pressure can be adjusted by changing the horizontal position of the first Wedge 84 between the first 50 and the second carrier 52 is varied. In particular, the surface pressure in the Gap 42 can be narrowed by moving the first wedge 84 to the left is shifted as illustrated in FIG. 2. In this case This wedge exerts greater force, causing the first carrier 50 and the second carrier 52 are pressed apart. The of The force exerted on the first wedge 84 also presses the upper one Plate cylinder 14 and the upper blanket cylinder 16 apart, resulting in a backlash and reduction in Surface pressure at the gap 42 leads. Accordingly, the Surface pressure in the gap 42 can be increased by the first Wedge 84 is shifted to the right, as in FIG. 2 illustrated.

If the third carrier 54 is in the position indicated in FIG. 2 occupies the curved upper surface 98 on the Web section 96 to the third wedge 122 on the fourth carrier 56. By means of the actuating cylinder 140 and the piston rod 142 the third carrier 54 is held in this position. This third Carrier 54 in turn holds fourth carrier 56 in position, wherein the curved top surface 126 on the fourth support 56 to the second wedge 88 abuts on the second carrier 52. The lower one Printing plate 38 and lower blanket 36 are then used Ink transfer pressed together at the gap 46. Also stand the lower blanket 36 and the upper blanket 34 with the respective opposite side surfaces of the web 12 at the gap 44 in a color transfer relationship and are thus at this Gap 44 effectively pressed together.

Analogously to the adaptation of the surface pressure in the gap 42 also adapted the surface pressure in the gap 44 or 46 by the horizontal position of the second 88 or third Keils 122 is adjusted. According to this feature of the present The invention includes the printing unit cylinders of the printing unit 10 no bearer rings, which in a conventional printing unit Control the surface pressure in the respective cylinder gap. In the printing unit 10, the surface pressure in the gap 42nd or 44 or 46 by means of the adjustable wedge arrangement 80 or 82 or 120 controlled, depending on the actuating status of actuating cylinder 140 and piston rod 142.

As soon as printing is finished, the Printing unit cylinders 14 - 20 parked apart. The Parking control means 150 is actuated to the actuating cylinder 140 to put pressure so that the piston rod 142 out the actuating cylinder 140 moved out. The piston rod 142 moves then down, as shown in Fig. 2, and pivots the third beam 54 clockwise around the lower one Abstellachse 100. The weight of the fourth carrier 56 and about half the weight of the lower blanket cylinder 20 and of the lower blanket 36 bear on the third carrier 54 whose curved upper surface 98 is the third wedge 122. The fourth carrier 56 is mounted such that it is separated from the third Carrier is carried down, i.e. rather, under the Influence of gravity moves down when the third Carrier 54 is moved downward from piston rod 142. By gravity becomes the fourth carrier 56 becomes clockwise around the intermediate stop axis 110 and from the second Carrier swung away. In this way the fourth moves away Carrier 56 from the second carrier 52 until the end stop the limiting means 130 hits the side wall 22. So the fourth carrier 56 can assume its parking position, in which is spaced from the second support 52. At Continued downward movement of the piston rod 142 then third bracket 54 pivoted away from the fourth bracket 56. Of the third carrier 54 becomes as long as from fourth carrier 56 moved away until the web portion 96 of the third carrier 54 the lower stop 160 hits the side wall 22. So will the third carrier 54 is brought into its parking position in which it is spaced from the fourth carrier 56.

After the pivotal movement of the third bracket 54 from the lower stop has been stopped, the actuating cylinder 140 pressured further so that this one Performs upward movement as shown in FIG. 2. Contrary to that The first carrier 50 becomes clockwise around the upper shut-off axis 66 swiveled. Such movement of the first bracket 50 sets continues until the web portion 62 of the first carrier 50 strikes an upper stop 162 on the side wall 22. So the first carrier 50 is brought into its parking position, in which it is spaced from the second carrier 52.

When the carrier 50, 54 and 56 in the respective parking position have been brought, the printing couple cylinders 14-20 the respective gap 42, 44 and 46 sufficiently far from each other turned off that access to the respective printing plate and the respective blanket is possible. When printing again should be included, the carrier 50, 54 and 56 as well the cylinders 14, 18 and 20 in their respective working positions moved back after - under the influence of the Parking control means - the above-mentioned movement sequence has been reversed. As mentioned above, is to turn off the Printing unit cylinders 14 - 20 to a corresponding carrier arrangement the opposite ends of these printing unit cylinders 14-20 intended.

The printing unit 10 further includes means for tilting the upper 14 and lower plate cylinders 18. As in FIG. 3 shown defines the socket 65 - in addition to the upper one Abstellachse 66 - an upper inclination axis 170. This socket 65 has a main portion 172 and an eccentric Section 174. This upper inclination axis 170 is the central axis of the main section 172. The upper storage axis 66 is the central axis of the eccentric portion 174. This main portion 172 of the bush 65 is on the side wall 22 stored so that it with respect to this side wall 22 around the upper inclination axis 170 is rotatable. If the main section 172 rotates about the upper tilt axis 170, rotates also the eccentric section 174 around this upper one Inclined axis 170. The upper parking axis 66 on the eccentric section 174 then moves on one on the upper inclined axis 170 centered circular path to the right or left, as shown in Fig. 3.

An inclination device 180 includes a lever 181 and an adjustment rod 182 which between the side wall 22 and the Main section 172 of the socket 65 are connected to one another. Of the Lever 181 and main section 172 are in turn together are connected to together around the upper tilt axis 170 to rotate. An end portion of the adjustment rod 182 is on the side wall 22 is pivotable about an axis 183 and by means of a Motors 185 also rotatably mounted about its own longitudinal axis 184. The other end of the adjustment rod 182 is one External thread and is provided by a sleeve with an internal thread 186 added, which is connected to the lever 181 so that this lever 181 is pivotable about an axis 188. When the adjustment rod 182 rotates in the sleeve 186, moves this moves into and out of the sleeve 186 and moves this sleeve 186 to the right or left, as in Fig. 3rd illustrated. Due to such movements of the sleeve 186 rotates the lever 180 and the bush 65 around the upper Inclination axis 170.

The first carrier 50 is on the eccentric section 174 of FIG Bush 65 rotatably mounted around this and thus also in the Bushing 65 is pivotable relative to the side wall 22 about the upper one Abstellachse 66 attached, as in relation to FIG. 2 already described. If the socket 65 is by means of the adjusting rod 182 rotates about the upper inclination axis 170, the rotates Main portion 60 of the first carrier 50 with the eccentric Section 174 of the bushing 65 about the upper inclination axis 170. The main section 60 of the first carrier 50 then moves in sliding contact with the upper surface or support surface 190 of the first wedge 84 to the right or left, the curved lower surface 64 of the first wedge 84 remains on top surface 190. The first Carrier 50 moves across upper blanket cylinder 14. The end of the upper plate cylinder 14 that of the first Carrier 50 is supported, moves transversely to this first Carrier 50. The opposite end of the top Plate cylinder 14 does not move across this first Beam 50. So the angular position of the axis 68 of the upper Plate cylinder 14 against the axis 76 of the upper Blanket cylinder 16 inclined when the first carrier 50th is moved transversely to the blanket cylinder 16. The amount by which the upper plate cylinder 14 is inclined by the Determines the amount by which the adjusting rod 182 moves by means of the Motor 185 rotates to turn bush 65 around the upper one To turn the tilt axis 170.

As described above, the axis 66 of the eccentric moves Section 174 of the socket 65 on a circular path that on the upper inclination axis 170 is centered. The main section 60 of the first carrier 50 moves with the eccentric Section 174 of the bushing 65 about this upper inclination axis 170. moreover, the curved lower surface 64 of the first beam guides 50 the web section 62, which rotates in Sliding contact with the top surface 190 of the first wedge 84 when the main section 60 is around the top Inclination axis 170 rotates. The curved lower surface 64 faces has a special radius of curvature that matches the top surface 190 and the socket 65 cooperate to make the entire first Carrier 50 on one on axis 76 of the upper one Blanket cylinder to move centered circular path. The axis 68 of the upper plate cylinder 14 thus runs on one on the Axis 76 of the upper blanket cylinder 16 centered circular path, when the upper plate cylinder 14 is tilted. That's why the distance between axes 68 and 76 remains in essentially unchanged when the plate cylinder 14 is slanted. Consequently, the remains Surface pressure in gap 42 essentially unchanged, when the upper plate cylinder 14 is tilted.

The socket 99 and an inclination device 200 are analogous with the lower plate cylinder 18 and the lower one Blanket cylinder 20 connected, as illustrated in Fig. 4.

Corresponding to the socket 65, the socket 99 defines a lower one Inclination axis 202 in addition to the lower parking axis 100. According to the inclination device 180, the Inclination device 200 a lever 204 and a Adjustment rod 206, which between the side wall 22 and the Socket 99 are attached. If the adjustment rod 206 rotates about the longitudinal axis by means of a motor 208, rotate the lever 204 and the bushing 99 together around the lower one Inclination axis 202. The bush 99 and the third wedge 122 cooperate with the third carrier 54 to make it transverse to the lower blanket cylinder 20 so that the first Carrier 50 moves across the upper blanket cylinder 16. The axis 102 of the lower plate cylinder 18, which at one end is mounted so that it moves the third carrier 54, moves then transversely to the axis 114 of the lower blanket cylinder 20 on one on this axis 114 of the lower blanket cylinder centered circular path. So the lower plate cylinder 18 in with respect to the lower blanket cylinder 20 inclined. By means of the swivel connections between the actuating cylinder 140, the piston rod 142, the carriers 50, 54 can the Actuating cylinder 140 and the piston rod 142 with respect to the Carrier 50, 54 pivoted after the inclination thereof will. Therefore, the upper and lower plate cylinders 14, 18 are tilted independently of each other and remain nevertheless connected to each other for cylinder shutdown.

Claims (9)

1. Printing unit of a rotary printing machine, having a frame (22), a first printing-unit cylinder (14), whose one end is rotatably mounted in a first support (50) mounted movably on the frame (22), a second printing-unit cylinder (16), which is rotatably mounted in a second support (52) mounted on the frame (22), and having means (140) for engaging the first and second printing-unit cylinders (14, 16) against one another and disengaging the said cylinders from one another, having a skewing device (180) for adjusting the angular position of the two printing-unit cylinders (14, 16) relative to one another, which skewing device has an eccentric hub (65) which can be rotated about a skewing axis (170) by skewing means (181 to 188) and in which the first support (50) is mounted so as to be rotatable about a disengagement axis (66) by the engagement and disengagement means (140), characterized in that a supporting means (84) with a supporting surface (190) is provided, on which the first support (50) is mounted in such a way that it moves in a direction running transversely to the skewing axis (170) in sliding contact with the supporting surface (190) when the hub (65) is rotated.
2. Apparatus according to Claim 1, characterized in that the first support (50) has a surface (64) which abuts the supporting surface (190), at least one of these two surfaces (64, 190) being curved in such a way that the first support (50) moves on a circular path which is centred relative to the axis of rotation (76) of the second printing-unit cylinder (16).
3. Apparatus according to Claim 1 or 2, characterized in that the supporting means (84) comprise wedge arrangements (80, 82) which are configured to be moveable back and forth between the first and the second supports (50, 52), and by means of which the contact pressure between the first and the second printing-unit cylinders can be adjusted in the printing position.
4. Apparatus according to Claim 3, characterized in that the wedge arrangements (80, 82) can be displaced by means of threaded rods (86, 90).
5. Apparatus according to one of the preceding claims, characterized in that the first and second printing-unit cylinders (14, 16) are configured without bearer rings.
6. Apparatus according to one of the preceding claims, characterized in that a fourth printing-unit cylinder (20), mounted in a fourth support (56), is provided below the second printing-unit cylinder (16), and a third printing-unit cylinder (18), mounted in a third support (54), is provided below the fourth printing-unit cylinder (20), the third support (54) being pivotable about a lower disengagement axis (100), and the fourth support (56) being pivotable about an intermediate disengagement axis (110) into respective engagement and disengagement positions.
7. Apparatus according to Claim 6, characterized in that the engagement and disengagement means are formed by an adjusting cylinder (140) and an associated piston rod (142) which engage on the first support (50) and on the third support (54) and pivot them in such a way that, when the piston rod (142) is retracted, the printing-unit cylinders (14, 16, 18, 20) are in the engagement position and, when the piston rod (142) is extended, are in the disengagement position.
8. Apparatus according to Claim 7, characterized in that the third and fourth printing-unit cylinders (18, 20) are moved into the disengagement position under the effect of gravity when the piston rod (142) is being extended.
9. Apparatus according to Claim 7 or 8, characterized in that limiting means (130, 160) are provided which, when the piston rod (142) is being extended, limit the downward movement of the third and/or fourth printing-unit cylinders (18, 20) when the latter have reached the disengagement position

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