ES2339617T3 - PRINT UNIT FOR A PRINT PRESS IN COIL. - Google Patents

Abstract

A printing unit (100) for a printing press for web material is disclosed, comprising: a plate cylinder (2) mounted rotatably at its ends (20) on two supports (1) mounted to slide horizontally on linear guides (5) integral with the sides (50) of the press structure, the plate cylinder (2) being designed to press against a drum (7) on which the web material to be printed runs; an anilox roll (4) mounted rotatably at its ends (20) on two supports (3) mounted to slide horizontally on linear guides (5), the anilox roll (4) being designed to press against the plate cylinder (2) to transfer ink from the anilox roll (4) to the plate cylinder (2); drive screws (6) operationally connected to the supports (1, 3) to drive them in translation; at least one handle (8) mounted in at least one of the supports (1, 3) that can be operated by the operator so as to uncouple said support (1, 3) both from the end (20) of the mandrel of the plate cylinder (2) or of the anilox roll (4) and from the drive screw (6).

Description

Printing unit for a printing press in coil.

The present invention relates to a unit of Printing for a coil printing press.

As it is known, a printing press it comprises a plurality of printing units through the that the band material to be printed is fed, which can be paper, cardboard, self-adhesive paper, plastic or a band composite laminate

Each printing unit is used to apply a color to the web material, and substantially comprises a set of three rollers between which the band material is fed (also referred to hereafter as a film for reasons of brevity), to which the color is transferred.

This set of three rollers comprises in particular an inking roller or anilox roller, which has in its outer surface a plurality of cells to retain the ink. The anilox roller collects the ink from a rubber roller that immersed in a special bucket or directly from a container, called "regulating blade in closed chamber" adapted to fill the anilox roller cells and transfer the ink to a  iron cylinder, which in turn applies it to a film that it is fed between said cylinder holder and a drum or large print cylinder

The structural details of the various rollers of a printing unit are not further described, because they must be considered known per se , and in any case as not forming the specific content of the invention.

The three rollers mentioned above of the printing unit have their axes parallel to each other and generally horizontal. In a printing unit, the cylinder printing belongs to the fixed structure of the machine, because It does not require replacement or position changes and is usually common to the various printing units, which are arranged to along its circumference, while the anilox roller and the cylinder holder undergo replacement or changes of frequent position; for this reason they are mounted on supports that they slide on the press frame and are operated by of screws mounted and anchored in the lateral parts of the press frame.

In particular, in most units of Currently existing printing, replacement of the iron cylinder each time the format is changed, that is, when a change in surface length is required external cylinder, and therefore a change in diameter.

At each makeover, it does not require a change of the diameter of the cylinder holder, only the plate replacement with the new image.

According to the prior art, the change of sleeves of the flat iron cylinder and anilox roller is long and complex. In fact, changing such a sleeve takes place in two stages. In the first stage the operator must release the end of the cylinder mandrel of its support. In the second stage the operator must move the support to create enough space to change the sleeve

Both stages are complex. In fact, in the first stage the operator must work in a narrow space due to the presence of the support. In the second stage the operator has difficulty moving the stand, because the screw drive is screwed into the bracket and therefore the movement of the bracket is conditioned to the operation of the screw drive

The object of the present invention is to overcome the drawbacks of the prior art by providing a unit printing that is practical, versatile and that can guarantee a quick and easy change of the sleeves of the anilox rollers and the flat iron cylinders.

In particular, an object of the invention is release the support of the cylinder holder and the anilox roller both of the chuck and the drive screw to ensure A quick sleeve change.

These objects are achieved with the unit of impression according to the invention having the characteristics listed in the attached independent claim 1.

Advantageous embodiments of the invention are described in the dependent claims.

The printing unit for a press roll printing according to the invention comprises:

- an iron cylinder mounted so swivel at its ends on two brackets mounted for slide horizontally on linear guides in solidarity with sides of the structure of the press, said design being designed iron cylinder to press against a drum on which runs the web material for printing,

- an anilox roller rotatably mounted at its end on two supports mounted to slide horizontally on said linear guides, said design being designed anilox roller to press against said cylinder to transfer the ink from the anilox roller to the cylinder iron holder, and

- connected drive screws operatively to said supports to produce their displacement.

The printing unit according to the invention it also comprises at least one handle mounted on at least one of said stands and that can be operated by the operator to decouple said support from both the mandrel end of said cylinder holder or said anilox roller as said drive screw

In this way the operator, through said handle, can move the relative support, without interfering with the chuck of the cylinder holder or anilox roller or with the bracket drive screw, to leave a space Enough to change the sleeve.

The advantages of the invention, which allows a Quick and easy replacement of cylinders or sleeves, are obvious.

The additional features of the invention they will be more evident through the detailed description to then, which refers to an embodiment merely by way of example and therefore not limiting it illustrated in the attached figures, in which:

Figure 1 is a side elevation view schematic showing a part of a side of a press of printing in which a printing unit according to the invention is Displays in the working state and the printing printer cylinder it is shown by a dashed line;

Figure 2 is a view like Figure 1 which shows the printing unit in the disassembly position, in the that the cylinder and the anilox roller are at a distance from each other;

Figure 3 is a view like Figure 1 which show the print unit in the sleeve change position, in which the supports have moved away from the cylinder holder and the respective anilox roller;

Figures 4, 5 and 6 are three enlarged views of the iron unit illustrated in Figures 1, 2 and 3, respectively;

Figures 4A, 5A and 6A are three views in section taken respectively along the planes horizontals of section A-A of figures 4, 5 and 6;

Figure 7 is a sectional view like the figure 4A, but showing the iron unit of figure 4 in neat cutting;

Figure 8 is a perspective view of the iron unit of figure 4; Y

Figure 9 is a perspective view of the handle of the ironing unit of figure 8.

The printing unit according to the invention, designated entirely with reference number 100, it Describe with the help of the figures. Many pieces shown in Figures 1-3, although shown individually,  they should be understood as symmetrically arranged pairs in both opposite sides of the press.

For reasons of clarity, the side of the press 100 that can be seen in Figures 1-3 indicates hereinafter as the operator side. In addition, the equal reference numbers designate equal parts or Similar.

With specific reference now to Figure 1, the printing unit 100 comprises a first pair of supports 1 adapted to support a cylinder 2 portaaplanchas and a second pair of supports 3 adapted to support an anilox roller or roller 4 inked with a plurality of cells on its surface external The supports 1 and 3 are mounted on roller carriages or of recirculating balls, in turn mounted in a sliding way on 5 linear guides arranged horizontally, in the direction longitudinal of the press. The cars are mounted so in solidarity with the respective supports (1, 3) and guides 5 are mounted in solidarity with the sides 50 of the frame of the press.

A container called the "regulatory blade in closed chamber "(not shown), designed to be filled with paint or ink and adapted to fill the cells engraved on the 4 anilox roller with paint or ink, is mounted on the 4 anilox roller In turn, roller 4 anilox transfers the ink to the cylinder 2 portaaplanchas, which is pressed against a drum 7 or large print cylinder, which is usually motorized. The band material film (not shown), which runs on the drum 7, passes through the gap between the drum 7 and the 2-cylinder cylinder that is responsible for the Image transfer

The supports (1, 3) of the cylinder holder and of the anilox roller are driven by means of 6 ball screws respective that move by screws 60 female respectively rotatably mounted on side 50 of the press. The 60 female screws are rotated by means of motors 66 electric, possibly through a belt drive. The screws 6 are arranged longitudinally between the two guides 5. The 50 side of the press has an opening 51 through that the screws 6 pass through. The opening 51 is sufficiently large enough to allow removal and / or insertion of the sleeve of the 2-cylinder or the 4-anilox roller during the sleeve change.

According to the invention, a handle 8, which protrudes in the operator side so that an operator can grab it, is mounted on each support (1, 3). Handle 8 is adapted to uncouple the respective support (1, 3) from both the screw 6 of drive like cylinder 2 plate holder or roller 4 anilox respective.

A locking / unlocking device 9 that can operated by the operator is also mounted on each support (1, 3) to lock the handle 8 during the operation of press and to unlock handle 8 to change the sleeve.

Figure 7 shows a sectional view, taken along a horizontal plane of the section at the axis level of the cylinder 2 holder, illustrating one of the two supports 1 of the cylinder holder, that is, the support 1 arranged in the operator side However, support 3 should be considered of the anilox roller arranged on the operator side has a substantially similar structure.

The support 1 has a hole 10 cross section designed to accommodate the end 20 of a mandrel 21 that supports sleeve 22 of the cylinder holder. Coinciding with the transverse hole 10, the support 1 has a pin 11 cylindrical protruding backwards, that is, into machine. As also shown in Figure 8, the spike 11 has a lateral opening 12 adapted to allow the passage of the end 20 of the mandrel.

Going back to figure 7, a hole 13 longitudinal that communicates with the transverse hole 10 is formed in the support 1. The longitudinal hole 13 has a diameter smaller than the transverse hole 10 and is adapted to Sliding the drive screw 6. He longitudinal hole 13 is located near the surface rear of bracket 1.

A second transverse hole 14 that opens on the front surface of the support 1 and communicates with the longitudinal hole 13 is formed in the support 1. The second transverse hole 14 has a smaller diameter than the longitudinal hole 13 and is arranged at a certain distance from the first longitudinal hole 10. In particular, the second transverse hole 14 has an end 15 of decreasing section that communicates with the long hole 13
tudinal

The drive screw 6 has in its end a cylindrical block 61, fixed by means of a bolt 62 axial. The cylindrical block 61 radially has a hole 63 of decreasing section with a taper that is the continuation exact part 15 of decreasing section of the second hole 14 cross. A sleeve 68, which provides an area of contact with support 1, to act as a stop, is mounted on screw 6.

With reference also to figure 9, handle 8 it comprises a plate 80 from which a forward protrudes U-shaped grip 81, adapted to be grasped by a hand of the operator. A first pin 82 and a second pin 83 protrude backwards from the two ends of the plate 80.

The first pin 82 carries at its end a sleeve 84, which has a circular seat 85 inside which it can rotate the end 20 of the cylinder holder chuck. Bearings of rollers or balls are arranged in the seat 85 of the sleeve to facilitate the rotation of the end 20 of the mandrel. Sleeve 84 of the handle has a diameter such that it can be inserted into the first transverse hole 10 of support 1.

The second pin 83 of the handle has an end 86 of decreasing section adapted to engage, in a relationship of conical coupling, with holes 15 and 63 section decreasing formed respectively in the second hole 14 transverse of bracket 1 and screw end block 61 6 drive.

A lockout appendix 87, arranged in a central position between the two pins 82 and 83, protrudes towards back from the iron 80 of the handle. Appendix 87 lockout is in shape of an iron, folded in an L-shape, which has in its end an 8 8 U-shaped opening.

With particular reference to figures 4 and 8, the locking / unlocking device 9 comprises a lever 90 which can be operated by the operator. The lever 90 has a end protrusion that supports a bolt 91 that can slide in a vertical slot 92 formed in a block 93 integral with the front surface of the support 1. Block 93 is arranged between the two holes (10, 14) of the support housing the two pins (82, 83) of the handle. In this way, when the two spikes (82, 83) of the handle are arranged in the two holes (10, 14) of the support, bolt 91 engages in opening 88 of locking appendix 87 of the handle, blocking the handle 8 in solidarity with the support one.

Now the change operation of sleeve made with the printing unit 100 according to the invention.

As shown in Figures 1, 4 and 4A, the handles 8 are initially locked in a solidary manner in the respective supports 1 and 3 of the cylinder 2 and the 4 anilox roller In particular, the levers 90 of the locking / unlocking devices 9 are arranged so that the bolt 91 engages in opening 88 of the locking appendix of handles 8 of supports 1 and 3 of the cylinder holder and anilox roller In this situation, the levers 90 are inclined with respect to a vertical direction.

Therefore, the ends 20 of the chucks of the cylinder holder and anilox roller se hook into the respective sleeves 84 of the handles, to rotatably support the mandrels. The conical ends 86 truncated the handles of the handles are hooked in the holes 63 of decreasing section of the ends of the screws 6 of respective drive to make the supports (1, 3) be solidary with the drive screws 6.

During printing, cylinder 2 plate holder is in contact with drum 7 and roller 4 anilox It is in contact with the 2-cylinder cylinder.

When the sleeve is going to be changed, as is shown in figure 2, screws 60 female of screws 6 of balls are rotated, to cause axial displacement of the screws 6. The supports (1, 3) of the cylinder 2, and of roller 4 anilox move therefore together to the right of so that the cylinder 2 of the iron holder moves away from the drum 7. Subsequently, the displacement of the screws of the ironing unit and continues the movement of the screws the anilox unit. As a result, the anilox roller 4 moves away from the 2-cylinder cylinder holder to create a space sufficiently Great to change the sleeve.

At that time, as shown in the figure 5, the operator rotates the release lever 90, in the direction of arrow F1, to release bolt 91 and pull it down, in the direction of arrow F2, so that bolt 91 slides in slot 92, releasing the handle locking appendix 87. Then, as shown in Figure 5A, the operator grabs the grip 81 of the handle, pulling it towards itself in the sense horizontal of arrow F3, to move it away from support 1.

As a result, the pins 82 and 83 of the handle are slide into the respective holes 10 and 14 of the support 1. By both, the end 20 of the mandrel 21 is released from sleeve 84 and at same time the truncated conical end 86 of the second pin 83 of the handle is released from hole 63 of decreasing section of the block 61 of screw end 6. It should be noted that with a single operator maneuver, support 1 is released from both mandrel 21 as of screw 6.

At that time, as shown in the Figures 3, 6 and 6A, the operator can move the support 1 towards the left (in the direction of arrow F4 in figure 6A) by of handle 8, freeing up the space for the replacement of sleeve 22 of the cylinder holder. It should be noted that the end 20 of the mandrel does not interfere with pin 11 of bracket 1, because it passes to through the opening 12 of the pin 11. In addition, the screw 6 does not interferes with the support 1, because the cylinder block 61 in the screw end slides freely into hole 13 longitudinal of support 1.

In any case, during its movement the support 1 is slidably supported on guides 5 linear side of the press. When bracket 1 enters contact with the stop sleeve 68 mounted on the screw 6, is leave enough space for the extraction of sleeve 22 and for replacing it with another sleeve of a different format.

Once the sleeve has been replaced, the operator, by means of handle 8, pushes support 1 to the right,  until the end 20 of the mandrel re-enters the hole 10 of the pin 11 of the support. In this situation, hole 63 truncated tapered screw end block 6 is aligned with hole 14 of support 1. At that time, the operator push the handle 8 towards the support 1. In this way, the end 20 of the mandrel hooks into sleeve 84 of the first pin 82 of the grip and the end 86 of decreasing section of the second spike of the grip is hooked in the hole 63 of decreasing section of the screw end Finally, the operator operates the locking lever 90, so that handle 8 locks firmly on stand 1.

Even if figures 4-9 show an embodiment that refers to the change of the sleeve of the ironing unit, it is evident that the change of sleeve in the anilox unit takes place in the same way; In fact, the support 3 of the anilox unit is manufactured substantially from it so that the support 1 of the ironing unit.

However, it is clear that the invention is not limited to the particular embodiment described previously and illustrated in the appended claims, but can be made numerous modifications of detail available to an expert in the technique to it and it is understood that all are within the scope of the invention, as set forth in the claims attached.

Claims (10)

1. Printing unit (100) for a press printing for web material comprising: - a cylinder (2) mounted on the plate holder rotating way at its ends (20) on two supports (1) mounted to slide horizontally on linear guides (5) solidarity with the sides (50) of the structure of the press, said cylinder (2) being designed for pressing against a drum (7) on which the band material runs for printing, - an anilox roller (4) mounted so swivel at its ends (20) on two other supports (3) mounted  to slide horizontally on said linear guides (5), said anilox roller (4) being designed to press against said cylinder (2) for carrying the ink from the roller (4) anilox to the cylinder (2) plate holder, and - connected drive screws (6) operatively to said supports (1, 3) to produce their displacement, characterized in that it also includes: - at least one handle (8) mounted on at least one of said supports (1, 3) and which is adapted to decouple said support (1, 3) of both the end (20) of the mandrel of said cylinder (2) iron holder or of said anilox roller (4) as of said drive screw (6).

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2. Printing unit (100) according to claim 1, characterized in that said handle (8) comprises: - a first pin (82) that bears on its end a sleeve (84) in which a seat (85) is formed adapted to rotatably accommodate the end (20) of said mandrel of the cylinder (2) or the roller (4) anilox, Y - a second pin (83), whose end is hooks into a seat (63) of said screw (6) of drive

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3. Printing unit (100) according to claim 2, characterized in that said support (1, 3) comprises: - a first hole (10) of transverse passage in which can slide said sleeve (84) of the handle (8), - a longitudinal hole (13) in which it can said said drive screw (6), and - a second transverse hole (14) that is opens on the outer surface of the support and communicates with said longitudinal hole (13), said second pin (83) being able of the handle (8) sliding in said second hole (14) cross.

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4. Printing unit (100) according to claim 2 or 3, characterized in that said second pin (83) of the handle (8) has an end (86) of decreasing section adapted to engage, in a conical coupling relationship, with a seat (63) of decreasing section formed radially in a cylindrical block (61) disposed at the end of said drive screw (6). 5. Printing unit according to any one of claims 2 to 4, characterized in that a roller or ball bearing assembly is arranged in said seat (85) of the sleeve of the first pin (82) of the handle (8) for support the end (20) of the mandrel rotatably. 6. Printing unit according to any one of claims 2 to 5, characterized in that said support (1, 3) comprises a pin (11) protruding into the press and crossed by said first transverse hole (10), having said pin (11) a side opening (12) adapted to allow passage of the end (20) of said mandrel of the cylinder (2) or the roller (4) anilox. 7. A printing unit according to any one of the preceding claims, characterized in that it comprises a locking / unlocking device (9) that can be operated by the operator to lock / unlock said handle (8) on / of said support (1, 3 ). 8. A printing unit according to claim 7, characterized in that said locking / unlocking device (9)
It comprises a lever (90) that operates a bolt or pin (91) adapted to engage in a locking seat (88) of said handle (8).

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9. Printing unit according to any one of the preceding claims, characterized in that it comprises female screws (60) rotatably mounted on the side (50) and which are rotated by electric motors (66) to cause the movement of said screws ( 6) drive. 10. Coil printing press, characterized in that it comprises at least one printing unit (100) according to any one of the preceding claims.