EP3927551B1 - Handling carriage for the cylinder of a printing unit in a printing machine - Google Patents

Description

The invention relates to a mobile carriage for handling a rotary cylinder in a printing unit of a printing machine and a printing machine.

A flexographic printing machine is used in the packaging industry to print a continuous web or plate-like material, such as a sheet of cardboard. The machine consists of several successive printing units, which are placed one after the other, each printing unit printing a different color.

A printing unit includes a plate cylinder, around which a flexible plate with raised patterns is wound and stretched. The plate cylinder prints the patterns directly by contact with the same color during each of its rotations. The plate prints the sheet after being coated with ink, thanks to a screened cylinder with cells, called an anilox, and an inking device, equipped with a doctor blade chamber, an ink reservoir, and at least one pump.

The screen cylinder has cells on its circumferential surface intended to retain the ink to be deposited on the plate of the plate cylinder. The volume of these cells varies depending on the work that is to be carried out. Thus, it is necessary to plan the use of different screen cylinders for each specific job that is to be carried out. For example, a screen cylinder used for printing with large solid areas, that is to say large areas inked uniformly, is not suitable for finer prints without large solid areas. This means exchanging these screen cylinders depending on the print quality that is to be obtained on the support.

State of the art

The document EP 1464490 describes a method and device for loading and exchanging the cylinders of the printing units of a printing machine.

A first disadvantage is that an operator is obliged to enter between the printing units to exchange the anilox cylinders, which requires particular attention on his part regarding his safety.

Another disadvantage is the relatively long time required to carry out the operation of exchanging the screened cylinders, which immobilizes the operation of the machine, thus reducing its productivity.

An additional disadvantage is that exchanging the cylinders requires two operators.

Statement of the invention

The invention aims to solve one or more of these drawbacks. The invention thus relates to a mobile carriage according to claim 1 and a printing machine according to claim 10.

The dependent claims relate to embodiments of the invention.

Brief description of the drawings

• [Fig.1] est une vue latérale d'une machine d'impression flexographique ;
• [Fig.2] est une vue latérale d'un groupe imprimeur de la machine d'impression de la Figure 1 associé à un chariot de manipulation de cylindre ;
• [Fig.3] est une vue partielle en perspective de la partie basse de la machine d'impression de la Figure 1 associée à un chariot de manipulation ;
• [Fig.4] est une vue en perspective partielle d'un chariot de manipulation selon un mode de réalisation de l'invention, en position déployée ;
• [Fig.5] est une vue en perspective d'un chariot de manipulation selon un mode de réalisation de l'invention, en position rétractée ;
• [Fig.6] est une vue en perspective d'un organe de support du chariot de manipulation de la Figure 5 ;
• [Fig.7],
• [Fig.8],
• [Fig.9],
• [Fig.10] et
• [Fig.11] sont des vues de côté schématiques de la manipulation d'un cylindre par un organe de support d'un chariot à différentes phases d'un processus de chargement du cylindre dans un groupe imprimeur ;
• [Fig.12] est une vue arrière de la partie haute d'un chariot selon un mode de réalisation de l'invention ;
• [Fig.13] est une vue de dessus du chariot de la Figure 12 ;
• [Fig.14] est une vue en coupe latérale du chariot de la Figure 12 détaillant un actionneur ;
• [Fig.15] est une vue de dessus d'un bras d'actionneur du chariot de la Figure 12, en position de préhension ;
• [Fig.16] est une vue en coupe partielle d'un cylindre reposant sur une coulisse d'un groupe imprimeur ;
• [Fig.17] est une vue de côté du cylindre de la Figure 16, en coupe au niveau d'une bride ;
• [Fig.18],
• [Fig.19],
• [Fig.20],
• [Fig.21] et
• [Fig.22] sont des vues de côté de différentes positions d'un actionneur et d'un organe de support à différentes étape d'une mise en place d'un cylindre dans un groupe imprimeur.

Other characteristics and advantages of the invention will emerge clearly from the description given below, for information purposes only and in no way limiting, with reference to the appended drawings, in which:

• [ Fig. 1 ] is a side view of a flexographic printing machine;
• [ Fig.2 ] is a side view of a printing unit of the printing machine of the Figure 1 associated with a cylinder handling trolley;
• [ Fig. 3 ] is a partial perspective view of the lower part of the printing machine of the Figure 1 associated with a handling trolley;
• [ Fig.4 ] is a partial perspective view of a handling trolley according to one embodiment of the invention, in the deployed position;
• [ Fig.5 ] is a perspective view of a handling trolley according to one embodiment of the invention, in the retracted position;
• [ Fig.6 ] is a perspective view of a support member of the handling trolley of the Figure 5 ;
• [ Fig.7 ],
• [ Fig.8 ],
• [ Fig.9 ],
• [ Fig. 10 ] And
• [ Fig. 11 ] are schematic side views of the handling of a cylinder by a support member of a carriage at different stages of a process of loading the cylinder into a printing group;
• [ Fig. 12 ] is a rear view of the upper part of a trolley according to one embodiment of the invention;
• [ Fig. 13 ] is a top view of the trolley of the Figure 12 ;
• [ Fig. 14 ] is a side sectional view of the carriage of the Figure 12 detailing an actuator;
• [ Fig. 15 ] is a top view of an actuator arm of the carriage of the Figure 12 , in gripping position;
• [ Fig. 16 ] is a partial sectional view of a cylinder resting on a slide of a printing unit;
• [ Fig. 17 ] is a side view of the cylinder of the Figure 16 , in section at the level of a flange;
• [ Fig. 18 ],
• [ Fig. 19 ],
• [ Fig. 20 ],
• [ Fig. 21 ] And
• [ Fig. 22 ] are side views of different positions of an actuator and a support member at different stages of installing a cylinder in a printing unit.

The X direction is a longitudinal direction and is defined by referring to the direction of travel or feeding of the plate elements in the packaging manufacturing machine, in the plate element receiving station, along their median longitudinal axis. The Y direction is a transverse direction and is defined as the direction perpendicular in a horizontal plane to the direction of travel of the plate elements. The Z direction is a vertical direction, perpendicular to the transverse direction Y. The upstream and downstream directions are defined by referring to the direction of movement of the plate elements, following the longitudinal direction throughout the packaging manufacturing machine, from the machine inlet to the machine outlet and the plate element receiving station.

Detailed disclosure of preferred embodiments

As represented by the Fig. 1 , a flexographic printing machine 100 comprises a margin station 1 followed by printing stations or printing groups positioned one after the other 2, 3, 4, 5, 6. The sheets to be printed 102 are transported in the longitudinal direction and in the cardboard travel direction (Arrow F) through these different stations by means of suction conveyors 7.

There Fig. 2 is a schematic representation of a printing unit 2 (printing units 3 to 6 being identical here). The printing unit 2 comprises a printing cylinder 8, a pressure cylinder 19, a screened cylinder 10 known as an anilox and a doctor blade chamber 13. The printing cylinder 8, the pressure cylinder 19, the screened cylinder 10 and the doctor blade chamber 13 cooperate with each other. The printing unit 2 comprises a reserve station 11 for screened cylinders 17 in the lower part of the printing machine 100. The printing machine 100 comprises a handling carriage 9 for the screened cylinders 17.

There Fig. 3 is a partial perspective view of the lower part of the printing machine 100. The reserve station 11 comprises supports 110 intended to support the ends of the screen cylinders 17. A storage station 14 is also arranged in the lower part of the margin station 1. This storage station 14 can comprise locations for three screen cylinders 17. This storage station 14 here comprises two reserve stations joined together and provided with supports 110 similar to those of the printing groups 2 to 6.

The carriage 9 for handling screened cylinders is common to the printing units 2 to 6 and to the margin station 1. The carriage 9 is movable in a plane horizontal. The carriage 9 is in particular configured to pass through the reserve stations 11 of the different printing groups 2 to 6. The carriage 9 is here guided in translation in the longitudinal direction by means of a guidance system 103. The guidance system 103 comprises rails or rolling paths 104 extending in the longitudinal direction.

There Fig. 4 is a perspective view of the lower part of a carriage 9 for handling screened cylinders 10 or 17. The carriage 9 comprises a chassis 90 in its lower part. The chassis 90 is movable in a horizontal plane including the longitudinal direction. The chassis 90 moves in the longitudinal direction while being driven by a motor 900. The chassis 90 comprises a safety device 901, provided with bumpers at its front and rear parts, pressure against these bumpers being able to induce an emergency stop of the carriage 9.

A support member 91 is mounted on the chassis 90. The support member 91 is here generally in the form of a plate. The support member 91 is configured to support and hold a cylinder 10 so that the axis of rotation of this cylinder is oriented in the transverse direction. The support member 91 here comprises bearing surfaces 911, positioned at its transverse ends. The bearing surfaces 911 here have U-shaped recesses, in order to be able to hold a cylinder 10 in a stable manner with its axis of rotation oriented in the transverse direction Y. A drive device 902 is configured to drive the support member 91 in translation relative to the chassis 90 in the vertical direction. The drive device 902 thus makes it possible to hold the support member 91 either in the retracted position or in different deployed positions. The retracted position of the support 91 makes it possible in particular to move the carriage 9 under the printing groups 2 to 6. The deployed positions make it possible in particular to manipulate a cylinder 10 in the reserve stations 11 or inside the printing groups 2 to 6. Such a drive device 902 has a structure, for example based on a geared motor and a chain transmission plus a screw and ball nut.

In order to be able to have a reduced vertical footprint when the support member 91 is retracted, the support member 91 is here advantageously mounted on the chassis 90 by means of a pantograph mechanism 903. The pantograph mechanism 903 thus comprises two intersecting slides supporting the support member 91.

The carriage 9 further comprises an actuator 92, not shown in the Fig. 4 for the sake of readability. The Fig. 5 is a perspective view of the carriage 9 provided with an actuator 92. The Fig. 6 is a perspective view of the support member 91 provided with the actuator 92, observed in a different orientation. As detailed below, the actuator 92 is mounted on the support member 91. The actuator 92 is configured to cooperate with a cylinder 10 when the latter is positioned remotely above the support member 91, as detailed below. A drive device 910 is configured to drive the actuator 92 in translation relative to the support member 91, in the longitudinal direction X.

A control circuit not shown is configured to control the movements of the mobile frame 90 and the movements of the support member 91. The control circuit is also configured to control the actuator 92.

THE Figs. 7 to 11 are schematic side views of the manipulation of a cylinder 17 involving the frame 90 and the support member 91 during the first stages of loading this cylinder 17 into the printing group 2. The subsequent stages of loading the cylinder 10 into the printing group 2, implementing the actuator 92, will be detailed later.

In the configuration illustrated in the Fig. 7 , cylinders 17 rest on supports 110 of a reserve station 11 positioned under the printing group 2. This sequence may correspond to an exchange of a screened cylinder. An exchange of a screened cylinder is for example necessary during a change of job requiring the use of a screened cylinder 17 having a configuration of its cells more suitable than the configuration of the cells of the previous screened cylinder to carry out this new job. In the configuration illustrated in Fig. 7 , a screen cylinder 10 was previously removed from the printing unit 2.

In the configuration illustrated in the Fig. 8 , the carriage 9 is positioned in the longitudinal direction, so that the bearing surfaces 911 are placed under one of the cylinders 17. The drive device 902 then raises the support member 91 until the bearing surfaces 911 come into contact with the cylinder 17 and then lift this cylinder 17 above its support 110.

In the configuration illustrated in the Fig. 9 , the carriage 9 is moved in the longitudinal direction X to place the cylinder 17 present on the bearing surfaces 911 vertically in the space 23 available between two printing units 2 and 3. A protective cover 21 is opened, in order to free up access for the purpose of placing the cylinder 17 opposite the cylinder 8 and the doctor blade chamber 13. Such a protective cover 21 is provided in particular to limit ink projections during the operation of the machine 100. An operator can thus enter the interior of the printing unit 2 during the operation of the machine 100. The drive device 902 then raises the support member 91 until the cylinder 17 is positioned above slides 22. The slides 22 take for example the form of rails oriented in the longitudinal direction X, and positioned with a transverse spacing corresponding substantially to the length of the cylinder 17.

In the configuration illustrated in the Fig. 10 , the carriage 9 is moved in the longitudinal direction X to place the cylinder 17 with its ends vertical to the slides 22.

In the configuration illustrated in the Fig. 11 , the drive device 902 then lowers the support member 91 until the cylinder 17 comes to bear by its ends on the slides 22, and until the contact between the bearing surfaces 911 and this cylinder 17 is eliminated.

There Fig. 12 is a rear view of the upper part of the carriage 9 according to one embodiment of the invention. More precisely, the Fig. 12 illustrates the actuator 92 and the support member 91 on which the actuator 92 is mounted. The Fig. 13 is a top view of the upper part of the carriage 9. The Fig. 14 is a side sectional view of the carriage 9, detailing a portion of the actuator 92.

The actuator 92 here comprises gripping members 93 and 94 arranged at transverse ends of the actuator 92. The gripping members 93 and 94 are movable relative to the support member 91 in the direction longitudinal. The gripping members 93 and 94 are here slidably mounted relative to the support member 91 in the longitudinal direction. The gripping members 93 and 94 may, for example, be slidably mounted on respective guide rails (not shown) of the support member 91.

The drive device 910 drives the gripping members 93 and 94 to slide in the longitudinal direction. The gripping members 93 and 94 are driven in longitudinal sliding by screw and ball nut drive mechanisms respectively. Screw and ball nut mechanisms make it possible in particular to drive the actuator 92 with a mechanism having a reduced bulk. The gripping members 93 and 94 comprise in particular vertical uprights 934 and 944 respectively. The gripping members 93 and 94 are guided in longitudinal sliding relative to the support member 91, by means of these vertical uprights 934 and 944. As better illustrated in the Fig. 14 , the vertical uprights are hollowed out in their downstream part, in order to facilitate the passage of the actuator 92 between cylinders 17 present in a reserve station 11.

The gripping members 93 and 94 comprise respective lugs 931 and 941. These lugs 931 and 941 are positioned at an upstream longitudinal end of the gripping members 93 and 94. The upstream longitudinal end of the gripping members 93 and 94 is here movable in the transverse direction relative to the support member 91. In this embodiment, the gripping members 93 and 94 comprise arms 932 and 942 respectively. The lugs 931 and 941 project transversely outwards relative to the arms 932 and 942 respectively.

These arms 932 and 942 are pivotally mounted around respective vertical axes 930 and 940. A pivoting of the arms 932 and 942 thus makes it possible to modify the transverse position of the lugs 931 and 941 respectively. The pivoting of the arms 932 and 942 is exerted by respective jacks 936 and 946, controlled by the control circuit.

The axes 930 and 940 are here fixed on a crosspiece 920. The crosspiece 920 extends in a transverse direction and secures the upper ends of the uprights 934 and 944. Such a crosspiece 920 makes it possible to stiffen the actuator. 92. In the present case, the arms 932 and 942 are transversely cantilevered relative to the upright 934 and 944 respectively. Such a crosspiece 920 thus makes it possible to stiffen the actuator 92 in the face of pivoting torques exerted on the arms 932 and 942.

In the illustrated example, the actuator 92 is provided with at least one sensor for determining the presence of an object near the end of the arms 932 and 942. In the example, the actuator 92 comprises inductive sensors for determining the presence of a flange of a cylinder 17 near the lugs 931 and 941. An inductive sensor 933 is in particular fixed to the end of the arm 932, and an inductive sensor 943 is in particular fixed to the end of the arm 942.

There Fig. 15 illustrates the gripping member 93 engaged with a flange 173 of a cylinder 17. In this configuration, the arm 932 is pivoted so as to introduce the lug 931 into a bore 174 of the flange 173. The bore 174 is offset relative to the axis of rotation of the cylinder 17. The introduction of the lug 931 into the bore 174 does not disturb the subsequent gripping of the bearing 172 by a disengageable bearing of the printing unit.

An example of a cylinder 17 configured to cooperate with the actuator 92 is illustrated with reference to Figs. 16 And 17 . There Fig. 16 is a partial sectional view of such a cylinder 17. The cylinder 17 has an anchoring surface 175 in its middle part. The cylinder 17 has a bearing surface 170 at each of its transverse ends (the transverse direction here corresponds to the Y direction detailed previously, i.e. the axis of rotation of the cylinder 17). A coupling part 171 is fixed to the end of the bearing surface 170. The coupling part 171 allows the printing unit to drive the cylinder 17 in rotation. A bearing 172 is fitted onto the bearing surface 170. The bearing 172 is used to ensure the rotational guidance of the cylinder 17 relative to the printing unit. A disengageable bearing (not shown) of the printing unit is thus configured to grip a peripheral surface of the bearing 172. The cylinder 17 is further configured to roll on the slides 22, bearing on the bearings 172. The cylinder 17 can thus be guided in sliding in the longitudinal direction, by means of the contact between the slides 22 and the bearings 172.

The flange 173 is here fixed on the bearing surface 170. The configuration of the flange 173 is here better illustrated in the Fig. 17 . At least one bore 174, in this case two opposite bores 174 formed in the flange 173 allow the lug 931 to selectively engage with the flange 173. When the lug 931 is engaged with the flange 17, the gripping member 93 can drive the cylinder 17 in translation in the longitudinal direction. Of course, the lug 941 can selectively engage with a similar flange at the other transverse end of the cylinder 17. The inductive sensors possibly positioned at the ends of the arms 932 and 942 allow in particular the control circuit to determine whether the lugs 931 and 941 are engaged or not with the flanges 173 of a cylinder 17.

The flange 17 here comprises flats 176, which allow the slide 22 to guide this flange 17 in sliding in the longitudinal direction. The flats 176 make it possible to keep the bores 174 always in the same orientation during the translation of the cylinder 17 on the slides 22 for locking the lugs 931 and 941 and introducing the cylinder 17 into the machine in the working position (200).

THE Figs. 18 to 22 are side views of different positions of the actuator 92 and the support member 91 at different stages of positioning a cylinder 17 in a printing unit.

In the configuration illustrated in the Fig. 18 , the cylinder 17 rests on the bearing surfaces 911 of the support member 91. The control circuit has previously commanded a rise of the support member 91, so that the support member 91 is positioned substantially at the same height as the slides 22 of a printing unit. The gripping members 93 and 94 are held in the retracted position, so as not to interfere with the flanges of the cylinder 17. The position of a bearing for driving the cylinder 17 in rotation by the printing unit is illustrated by the circle 200. This bearing 200 is positioned in an upstream position relative to the support member 91. The control circuit is configured to control the movement of the support member 91 longitudinally relative to the printing unit in the upstream direction.

In the configuration illustrated in the Fig. 19 , the support member 91 has led the cylinder 17 to a position where its ends are positioned vertically to the slides 22, with a spacing relative to the slides 22. The cylinder 17 is therefore still supported by the supports 911. The control circuit then controls a descent of the support member 91.

The descent of the support member 91 is continued until the cylinder 17 is supported at its ends by the slides 22, as illustrated in Fig. 20 The descent of the support member 91 is carried out so that the lugs 931 and 941 of the gripping members 93 and 94 are positioned at the height of the bores 174 of the flanges 173. Furthermore, the gripping members 93 and 94 are moved longitudinally so as to position the lugs 931 and 941 opposite the bores 174 of the flanges 173 (optical sensors can be implemented in order to ensure precise longitudinal positioning of the lugs 931 and 941 relative to the bores 174, by longitudinal movement of the actuator 92). The control circuit then controls the passage of the gripping members 93 and 94 into the deployed or locking position. The lugs 931 and 941 then engage in the bores 174 of the flanges 173. The control circuit is then configured to command the actuator 92 to drive the cylinder 17 to slide in the upstream direction. The actuator 92 thus slides in the upstream direction relative to the support member 91.

The sliding of the cylinder 17 on the slides 22 is continued until the bearing surfaces of the cylinder 17 are positioned at the level of the bearings 200 of the printing unit, as illustrated in Fig. 21 . When the printing group determines that the cylinder 17 is in position, the bearings 200 can lock onto the bearings 172 of the cylinder 17.

The control circuit is configured to implement a reverse order of operations, in order to ensure the unloading of the cylinder 17 of the printing group.

The actuator 92 according to the invention thus makes it possible to automatically load or unload a cylinder in a printing unit. Such manipulation by the actuator 92 makes it possible to limit operator interventions in the printing unit and allows to reduce the loading or unloading cycle time of the cylinder. In addition, the configuration of the actuator 92 illustrated proves to be particularly compact, favoring its movement in the longitudinal direction in the reduced space available in the printing unit. Longitudinal movements of the actuator 92 can in fact be carried out while keeping the support member 91 stationary. The actuator 92 can thus carry out cylinder manipulations, where the support member 91 could not access due to its size.

In the illustrated embodiment, the actuator 92 further comprises a guidance system and a drive mechanism at each end of the cylinder 17, which allows for linear translation without the risk of offset between the left and right sides as may be the case with manual movement by two operators.

• récupérer un cylindre initialement en place dans le groupe imprimeur ;
• placer le cylindre récupéré dans un emplacement vide d'une station de stockage 11;
• récupérer un autre cylindre stocké dans un emplacement de la station de stockage 11 ;
• charger cet autre cylindre dans le groupe imprimeur ;
• relancer le cycle d'impression du groupe imprimeur avec cet autre cylindre.

Various examples of cylinder loading/unloading scenarios can be implemented using a carriage 9 according to the invention. For example, the carriage 9 can be controlled to replace a cylinder currently in use in a printing unit with another cylinder stored in a storage station. For this purpose, the control circuit can control the following sequence to the carriage 9:

• recover a cylinder initially in place in the printing group;
• placing the recovered cylinder in an empty location of a storage station 11;
• retrieve another cylinder stored in a location of storage station 11;
• load this other cylinder into the printing unit;
• restart the printing cycle of the printing unit with this other cylinder.

The carriage 9 can be implemented according to this scenario to change the cylinders of one or more printing groups during the same stopping phase of the printing cycle.

• récupérer un premier cylindre initialement en place dans un premier groupe imprimeur ;
• placer le premier cylindre récupéré dans un emplacement vide d'une station de stockage 11;
• récupérer un deuxième cylindre initialement en place dans un deuxième groupe imprimeur ;
• charger ce deuxième cylindre dans le premier groupe imprimeur ;
• récupérer le premier cylindre dans la station de stockage 11 ;
• charger ce premier cylindre dans le deuxième groupe imprimeur ;
• relancer le cycle d'impression du groupe imprimeur.

According to another example scenario, the carriage 9 can be controlled to swap a cylinder in the working position in one printing unit with another cylinder in the working position in another printing unit. For this purpose, the circuit command can command the following sequence to cart 9:

• recover a first cylinder initially in place in a first printing group;
• placing the first recovered cylinder in an empty location of a storage station 11;
• recover a second cylinder initially in place in a second printing group;
• load this second cylinder into the first printing group;
• retrieve the first cylinder from storage station 11;
• load this first cylinder into the second printing group;
• restart the printing cycle of the printing unit.

• récupérer le cylindre initialement en cours d'utilisation dans le groupe imprimeur ;
• placer le cylindre dans une station de lavage ;
• procéder au nettoyage du cylindre dans la station de lavage.

According to another example scenario, the carriage 9 may be commanded to implement the cleaning of a cylinder initially in use in a printing group. For this purpose, the control circuit may command the following sequence carriage 9:

• recover the cylinder initially in use in the printing group;
• place the cylinder in a washing station;
• proceed to cleaning the cylinder in the washing station.

Claims (13)

1. Mobile handling carriage (9) for handling a rotary roll (10, 17) in a printing unit (2) of a printing machine (100), the mobile handling carriage comprising:

   - a chassis (90) that is movable in a horizontal plane, the chassis (90) being configured to move in a longitudinal direction (X) of travel of sheet elements by being driven by a motor (900);

   - a support member (91) mounted on the chassis and configured to support and hold the roll (10) so that its axis of rotation is oriented in a transverse direction (Y) perpendicular in a horizontal plane to the longitudinal direction (X);

   - a first drive device (902) configured to drive the support member (91) in translation with respect to the chassis (90) in a vertical direction;

   - a control circuit configured to control a first sequence including successively:

   - raising the support member (91);

   - longitudinal translation of the support member (91) by moving the carriage (9) in a first direction;

   - lowering the support member (91);

   characterised in that the mobile carriage (9) further comprises:

   - an actuator (92) mounted on the support member (91) and configured to cooperate with the roll (10, 17) positioned at a distance above the support member (91);

   - a second drive device (910) configured to drive the actuator (92) in translation with respect to the support member (91), in the longitudinal direction (X); and in that:

   - the control circuit is further configured to subsequently control, in said first sequence:

   - longitudinal translation of the actuator (92) in the first direction.
2. Mobile carriage (9) according to claim 1, wherein the control circuit is configured to control a second sequence including successively:

   - longitudinal translation of the actuator (92) in a second direction opposite to the first direction;

   - raising the support member (91);

   - longitudinal translation of the support member (91) in the second direction;

   - lowering the support member (91).
3. Mobile carriage (9) according to claim 1 or 2, wherein the actuator (92) comprises first and second gripping members (93, 94) arranged at first and second transverse ends of the actuator (92), the first and second gripping members (93, 94) being movable with respect to the support member (91) in the longitudinal direction, the first and second gripping members each having one end which is movable in the transverse direction.
4. Mobile carriage (9) according to claim 3, wherein the first and second gripping members (93, 94) each comprise an arm pivot-mounted (932, 942) about a vertical axis (930, 940).
5. Mobile carriage (9) according to claim 3 or 4, wherein the first and second gripping members (93, 94) each comprise a lug (931, 941) at their movable end, the lug projecting with respect to its gripping member in the transverse direction.
6. Mobile carriage (9) according to any of claims 3 to 5, wherein the actuator (92) comprises an optical sensor configured to adjust the stroke of the actuator (92) with respect to the position of the rotary roll (17).
7. Mobile carriage (9) according to any of the preceding claims, wherein the support member (91) comprises at least one longitudinal guide rail, and wherein the actuator (92) is slidably mounted on the guide rail.
8. Mobile carriage (9) according to claims 3 and 7, wherein the first and second gripping members (93, 94) are mounted on a single cross-member (920) slidably mounted on the rail and driven in translation by the second drive device (910).
9. Mobile carriage (9) according to any of the preceding claims, wherein the support member (91) is mounted on the chassis (90) via a pantograph mechanism (903).
10. Printing machine (100) comprising:

    - a mobile carriage (9) according to any of the preceding claims;

    - a rotary roll (17);

    - a printing unit (2) comprising two slides (22) spaced apart in a transverse direction, the two slides (22) interfering with the rotary roll (17) held on the support member (91), during the lowering of the support member (91) during the first sequence.
11. Printing machine (100) according to claim 10, wherein the rotary roll (17) comprises:

    - a middle portion;

    - first and second flanges (173) fixed on either side of the central part, the flanges comprising at least one bore offset from the axis of rotation of the rotary roll (17).
12. Printing machine (100) according to claim 11, wherein the rotary roll comprises a flat area (176) parallel to the axis of rotation of the rotary roll (17).
13. Printing machine (100) according to claim 11 or 12, wherein the rotary roll comprises a set of cells for receiving ink.

Images