ES2395183B1 - Method for pressure adjustment in a flexographic printer machine and flexographic printer machine for implementation. - Google Patents

Method for pressure adjustment in a flexographic printer machine and flexographic printer machine for implementation. Download PDF

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Publication number
ES2395183B1
ES2395183B1 ES201100920A ES201100920A ES2395183B1 ES 2395183 B1 ES2395183 B1 ES 2395183B1 ES 201100920 A ES201100920 A ES 201100920A ES 201100920 A ES201100920 A ES 201100920A ES 2395183 B1 ES2395183 B1 ES 2395183B1
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Spain
Prior art keywords
printing
cylinder
torque
cylinders
inking
Prior art date
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Expired - Fee Related
Application number
ES201100920A
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Spanish (es)
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ES2395183A1 (en
Inventor
Alfonso CORBACHO TEJADA
Jordi PUIG VILÁ
Sebastiá BOTA OLIVERAS
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Comexi Group Industries SA
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Comexi Group Industries SA
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Priority to ES201100920A priority Critical patent/ES2395183B1/en
Publication of ES2395183A1 publication Critical patent/ES2395183A1/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F33/00Indicating, counting, warning, control or safety devices
    • B41F33/02Arrangements of indicating devices, e.g. counters
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F13/00Common details of rotary presses or machines
    • B41F13/08Cylinders
    • B41F13/24Cylinder-tripping devices; Cylinder-impression adjustments
    • B41F13/34Cylinder lifting or adjusting devices
    • B41F13/38Cylinder lifting or adjusting devices electrically or magnetically operated
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F31/00Inking arrangements or devices
    • B41F31/30Arrangements for tripping, lifting, adjusting, or removing inking rollers; Supports, bearings, or forks therefor
    • B41F31/32Lifting or adjusting devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F33/00Indicating, counting, warning, control or safety devices
    • B41F33/0072Devices for measuring the pressure between cylinders or bearer rings
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F5/00Rotary letterpress machines
    • B41F5/24Rotary letterpress machines for flexographic printing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41PINDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2213/00Arrangements for actuating or driving printing presses; Auxiliary devices or processes
    • B41P2213/10Constitutive elements of driving devices
    • B41P2213/11Motors
    • B41P2213/124Electric motors
    • B41P2213/128Linear electric motors

Abstract

The method comprises: in a first step, linearly moving a printing roll and an inking roll towards a central, counterpressure roll, causing said rolls to rotate, and monitoring the torque thereof, and, upon detection of a variation in torque, performing a first adjustment of pressure between said printing roll and one of said central, counterpressure or inking rolls; and, in a second step, a) carrying out printing; b) capturing an image from said printing; c) examining the quality of said captured image; and d) varying the pressure exerted between the printing roll and one of said central, counterpressure or inking rolls; and repeating said sequence of actions a) to d) to achieve an optimum level of pressure between the rolls. The press is designed in order to implement the method.

Description

Method for pressure adjustment in a flexographic printing machine and flexographic printing machine for its implementation

Technical sector

The present invention concerns in a first aspect a method for adjusting the printing pressure, using information captured from the printed image, applicable to a flexographic machine, equipped as is conventional with several printing groups arranged around a central backpressure cylinder on which the material to be printed is supported, and each of said printing groups integrating at least one printing cylinder and an inking cylinder (also called an ink applicator) that receives ink feed, said adjustment being necessary to achieve a correct impression.

It is well known in this sector that in order to execute printing tasks using an flexographic machine and achieve an optimal ink transfer, it is necessary to provide a correct pressure adjustment both between the inking cylinder and the printing cylinder, and between said printing cylinder and the material to be printed, that is to say the correct pressure between said cylinders, inking cylinder and printing cylinder and between the latter and the central backpressure cylinder, which supports the material to be printed.

The correct pressure between the cylinders of the inking group (printing cylinder and applicator cylinder and between the printing cylinder and the central counterpressure cylinder (material) is a critical factor for correct printing, and depends among other factors of the type of cliché a print, of the adhesive with which the cliché has been fixed to the cylinder, of the material on which it is to be printed, of the motif to be printed, etc. and therefore must be adjusted in each new print job.

In a second aspect, the invention also provides a printing machine for implementing said method.

Background of the invention Numerous methods are known for adjusting the printing pressure in a flexographic machine.

In patent ES 2308716 an automatic adjustment is described by reading the printed surface and based on the comparison of the position of each of the monochrome prints of the different groups registered at different times by at least one sensor station. The method requires a sensor system for each printing group, where during a registration process it is located

respectively one printing cylinder after another in the printing position, and that

It comprises the following stages:

-a single sensor station records each monochrome print obtained

-the correction signals for the actuator or actuators of a printing cylinder

5
they are obtained from the monochrome image of each printing cylinder and the

information regarding the rotational movements of at least one cylinder of

Print.

Said patent ES 2308716 solves the problem of making the correct adjustment of

1 o
working pressures, but the method described implies that they cannot be performed

more than one color at the same time (being monochrome images) and this entails a great

waste of material and time when adjusting.

To solve the problem of the material and time spent making the adjustment,

fifteen
we can find in the state of the art various patents that try to make

more or less precise adjustments with minimal waste.

Thus, in EP 1 916 102 an adjustment system based on a series of

theoretical calculations on the outside of the machine, where the value of the

twenty
diameter of the printing and inking cylinder sleeves. From said

theoretical calculations are recalculated the final positions of the drives of

positioned. This procedure minimizes waste in time and material, but by

being a purely theoretical procedure the reliability of the adjustment is very low, since

not only the diameter of the rollers is involved in the printing process, but also

25
also and fundamentally the type of cliché to be printed, the ink, the substrate on

which is printed, ... all factors determining the correct pressure of

Print. This procedure is valid to find the contact point of the

printing cylinders and inking each other and the printing cylinder with the material,

but not to determine the correct pressure between them.

30

Patent application EP 1 018 426 discloses a flexographic printer in the

that an automatic procedure can be performed to adjust a cylinder of

printing, an applicator cylinder and a back pressure cylinder. Said procedure

It comprises the following stages:

35
   • first, and with the help of the cylinder's rotating drive motor

of printing, said printing cylinder is brought to a slow rotation;

then the applicator cylinder, which still does not rotate, slowly moves in its radial direction against the printing cylinder;

as soon as the printing cylinder and the applicator cylinder come into contact, a rotation of the rotation torque of the rotating drive motor of the

5 printing cylinder, which is registered by a rotary encoder (of said motor);

• the position that the applicator cylinder has reached at this time is stored by a printer control unit as zero position of said applicator cylinder;

Or • the printing cylinder is then moved - which continues to rotate - against the counterpressure cylinder until there is another change in the torque of your rotating drive motor;

• the position of the printing cylinder is stored in the control unit as zero position of the printing cylinder; Y

15 • the path that the print cylinder has traveled until it comes into contact with the backpressure cylinder is added to the zero position of the applicator cylinder The adjustment process according to the approach sequence according to the EP

1 018 426 has, however, disadvantages since the forces acting on the surface of the cylinder when the cylinders come into contact can be very high.

0 The tests have shown that the clichés mounted on the printing cylinders already show damage after some automatic adjustment cycles performed in accordance with this approach process.

On the other hand, the patent application W02010 / 142405 discloses a flexographic printer in which it is tried to solve the inconveniences of the automatic cycle 25 described in the application EP 1 018 426, especially those related to the damages that can be caused on the surface of the cliché . Said patent application WO 2010/142405 proposes a device and a method for adjusting the cylinders of a printer that do not damage the printing cylinder, in which the rotation drive of the cylinders of the inking group is controlled by a control unit of the printer

0 which is arranged in such a way that it operates in a weakened flow mode (limited torque) at least one of the rotating drive motors of the cylinders during mutual adjustment.


According to patent application WO 2010/142405, in order not to damage the raised areas of the printing cylinder during the adjustment procedure, the control unit reduces the current produced by the torque that is applied to the cylinder drive, so that the drive undergoes a weakening of the field and of this

way the magnetic flux in the engine working area is reduced below the value

nominal, which results in a reduction in torque at the drive

same speed When under such conditions a rotating cylinder contacts another

cylinder the torque and with it the force acting during the contact of the cylinders

5
on the surface of the cylinder, they are very small and thus the surfaces of

cliches are not damaged.

Both in EP 1916102 and in both EP patent applications

1018426 and WO 2010/142405, however, the real problem is not solved

consisting in the adjustment of the correct working pressure. In this background,

1O
detects a zero point of contact of the printing cylinder with the material and contact

of the cylinders of the inking group (applicator cylinder and printing cylinder) with each other,

but then an approach movement of between 1 O and 100 microns must be applied

(see page 5 lines 20 to 23 of application WO 2010/142405) to achieve the optimum

work pressure. This approach between 1 O and 100 microns is for consideration.

fifteen
of the machine operator, so that an optimum is not automatically achieved

work adjustment.

In ES 2300209 a method of positional adjustment of bodies is proposed

printers in flexographic printing machines comprising the following steps:

a) move linearly in approximation by guide provisions of a

twenty
first printing cylinder towards the support drum by means of a linear motor;

b) detecting that a point of contact has been reached between said first cylinder

printing, or a cliché fixed around it, and the sheet material

resting on the support drum;

e) rotate the support drum, and allow the first roller to rotate

25
impression dragged by the friction support drum, through the material

laminate, or spin them both synchronously: the support drum and the

first printing cylinder; Y

d) detect the linear approach-distance positions on said

guide arrangements of the first printing roller.

30
This method includes in step e) an action that involves friction

which can in some cases result in damage to the material, or errors, and adjustment

It depends on the reliability of the detection in the final stage d).

The objective of the present invention is to present a method of adjusting the

35
   working pressure applied to inking and printing cylinders, in which

really determine automatically the optimum working pressure, with the help of

a print image acquisition device, such as a linear camera and

allowing to perform a part of the method simultaneously with several groups of

printing avoiding the downtime between the printing zone and the zone of

viewed, saving a significant volume of print material, automating

5
the adjustment and avoiding the intervention of the operator and the possible errors that may

commit.

Brief exposition of the invention

For this purpose the present pressure adjustment method is executed in a

1 o
Conventional flexographic printing machine equipped with several printing groups

arranged around a central backpressure cylinder on which it is located

the material to be printed, integrating each of said printing groups at least one

printing cylinder and an inking cylinder, capable of rotation by means of a

drive motor in rotation, said printer machine associated with

fifteen
image acquisition means, such as a linear camera or other system, capable of

capture a print image of each print group and of the set or of a

selected group of them. In addition, the flexographic printing machine has

of a control unit for detection of one or more movement parameters

Rotating cylinders, such as torque, electrical intensity consumed by

twenty
said drive motor in rotation or the speed of rotation.

The pressure setting of each of the printing groups in relation to the

back pressure cylinder is made by means of positioning engines that

they apply to the bearing axes of said printing and inking cylinders, in their

radial direction, a linear displacement

25
The method, for a printing group, comprises two distinct stages.

In a first stage the following actions are carried out:

- linearly move said printing cylinder and said cylinder

inking towards said central backpressure cylinder, rotating them,

actively or passively, and monitoring its torque, and

30
-make, from a detection of a torque variation, a first

pressure adjustment between at least said printing cylinder with said

back pressure cylinder or between said printing cylinders and

Inker

This ensures a contact position between the different cylinders.

35
   In a second stage a fine pressure adjustment is carried out by at least

a sequence that includes the following actions:

a) make an impression on a sheet material arranged on

said central backpressure cylinder,

b) capture at least one image of at least part of said

printing, for example using a linear camera,

5
e) analyze the quality of said captured image; Y

d) vary the pressure exerted by the printing cylinder on the cylinder

of central back pressure, or the pressure between said two cylinders,

by means of the aforementioned positioning engines.

And the aforementioned sequence of actions a) to d) will be repeated until a point is reached

1 o
Optimum pressure between the cylinders determined by the optimum image quality

captured

According to the proposed method, the first stage of pressure adjustment is

performed simultaneously in several printing groups and said second stage is

You can perform group by group or simultaneously depending on the type of reason to

fifteen
to print.

In addition, the second fine adjustment stage is performed with torque monitoring.

actuation of at least one of said printing and inking cylinders.

During the first stage of pressure adjustment, it is also planned

twenty
monitor the torque of the positioning motors, and that said motors operate in at

minus said first stage in torque limitation mode (reduced torque).

Other features of the invention will appear more clearly from

reading an example of embodiment described below with the help of

some sheets of drawings.

25

Brief description of the drawings

Fig. 1 is a schematic view of a flexographic printing machine for

Implement the method of this invention.

Fig. 2 schematically illustrates the elements involved in the method of

30
adjustment of the present invention, according to an embodiment example.

Fig. 3 is a block diagram explaining the proposed method.

Detailed description of an execution example

A typical printing group of a printing machine is shown in Fig. 2

35
   flexographic, associated with a central backpressure cylinder 1, integrating a cylinder of

impression 2 and an inking cylinder 3, which are facing each other in printing situation

and capable of rotation with the help of a respective rotating drive motor

5, 4.

The printing machine to implement the method of this invention

it has means associated with a control unit (not illustrated) for detection of

5
one or more parameters of the rotary movement of cylinders 2, 3, in particular the torque

of rotation, the electrical intensity consumed by said motors of rotation drive

4, 5, or the rotation speed (obtained by means of detectors 6, 7, such as

rotary transducers).

Figure 2 shows pressure adjustment means 8, 9, 1O, 11,

1 o
implemented in this exemplary embodiment by means of an electric motor assembly

spindle, hereinafter referred to as positioning motors, which apply to the ends

of the bearing axes of said printing cylinders 2 and inking 3, in their direction

radial, a linear displacement in approximation or distance with respect to the cylinder of

back pressure 1, central.

fifteen
The printing machine also has image capture means

C (see Fig. 1) for acquisition of visual information of the impressions made by

each group G1 to G8, by several groups or by the group of groups G1 to G8 of the

machine.

The method proposed by this invention comprises, for each group of

twenty
Print:

A first stage in which said printing cylinder moves linearly

2 and said inking cylinder 3 towards said central backpressure cylinder 1,

by turning them (through motors 4, 5), actively or passively, and

monitoring its turning torque (by conventional means such as by tracking

25
of the evolution of the intensity of the current consumed by each motor 4, 5), and

perform, from a detection during said monitoring, a torque variation,

(increase above a certain threshold) a first pressure adjustment between the

minus said printing cylinder 2 with said backpressure cylinder 1 or between said

printing cylinders 2 and inking 3, thereby ensuring that a

30
contact position between the different cylinders.

In a second stage a fine adjustment of pressures is carried out by means of one or

more sequences, including said sequence the following actions:

a) make an impression on a sheet material L arranged on

said central backpressure cylinder 1,

35
   b) capture at least one image of at least part of said

printing, for example by a linear camera C,

e) analyze the quality of said captured image; Y

d) vary the pressure exerted by the printing cylinder 2 on the central counterpressure cylinder 1, or the pressure between said two cylinders 2, 3, by means of said positioning motors 8, 9, 10,

5 11.

One or more sequences with the aforementioned actions will be used until an optimum pressure point is reached between the printing cylinder 2 and the inking cylinder 3, and between the printing cylinder 2 and the backpressure cylinder 1.

Fig. 3 clearly shows the proposed method and it shows

1O that the mentioned first stage of pressure adjustment can be carried out simultaneously in several printing groups (GROUP01 to GROUP n) which represents a significant saving by avoiding the successive printing of the different groups, also avoiding the dead time that exists between the printing groups and the viewing area, saving a significant number of meters of test sheet material.

On the other hand, said second stage is carried out group by group and advantageously with a monitoring of the driving torque of at least one of said printing cylinders 2 and inking 3.

According to other characteristics of the proposed method:

• in said first adjustment stage it is also planned to also monitor the 20 torque of the positioning motors 8, 9, 10, 11;

in said first stage the positioning motors 8, 9, 1O, 11, will operate in torque limitation mode (reduced torque);

the linear displacements of the cylinders 2, 3, are performed alternatively by operating the positioning motors 8, 11 on a

25 end of a carrier shaft of cylinders 2, 3, or engines 9, 1On the other end or all of the positioning motors 8, 9, 1O and 11, on both ends of both cylinders 2, 3 at the same time. As the invention has indicated in a second aspect, it proposes a flexographic printing machine having a conventional general structure, which

30 is illustrated in Fig. 1, formed by a central backpressure cylinder 1, on which a sheet material L displaced from a reel runs through a rewinder D and rolled up forming a reel of printed material by means of a rewinder R.


The flexographic printing machine proposed by the second aspect of the invention has associated a linear camera C or another system for acquiring 35 print images, and as a particular feature incorporates a control unit (not illustrated), in connection with said detection means of pair and with said system of

acquisition of images and, planned to execute said first and second stages of the explained method.

A person skilled in the art could introduce changes and modifications in the

exemplary embodiments described without departing from the scope of the invention as is


defined in the appended claims.

Claims (8)

1.- Method for adjusting pressures in a flexographic printing machine, equipped with several printing groups (G1 to G8) arranged around a central backpressure cylinder (1) on which the material to be printed (L) is located, integrating each of said printing groups (G1 to G8) at least one printing cylinder (2) and an inking cylinder (3), capable of rotation by means of a rotating drive motor (4, 5), the printer having means (6, 7) associated with a control unit for detecting one or more parameters of the rotary movement of the cylinders (2, 3), such as the torque, electrical intensity consumed by said rotating drive motor (4, 5) or the speed of rotation, and the printer having pressure adjustment means that apply to the ends of said printing cylinders (2) and inking (3), in their radial direction, a linear displacement, and integrate positioning motors (8, 9, 10, 11), comprising the method, for each printing group (G1 to G8):
-
 in a first stage perform simultaneously in several printing groups (G1 to G8):
-
 linearly moving said printing cylinder (2) and said inking cylinder (3) towards said central counterpressure cylinder (1), rotating them, actively or passively, and monitoring their turning torque, and
-
 making, from a detection of a variation of torque, a first pressure adjustment between at least said printing cylinder (2) with said central backpressure cylinder (1) or between said printing cylinders (2) and inking (3);
-
 in a second stage, make a fine adjustment of pressures by means of at least one sequence that includes the following actions: a) make an impression on a sheet material (L) arranged on
said central backpressure cylinder (1), b) capturing at least one image of at least part of said printing, c) analyzing the quality of said captured image; and d) vary the pressure exerted by the printing cylinder (2) on the
central backpressure cylinder (1), or the pressure between said two printing cylinders (2) and inking (3), by means of said positioning motors (8, 9, 10, 11);
and repeat said sequence of actions a) to d) until an optimum pressure point is reached between the cylinders.
2- Method according to claim 1, characterized in that said second stage is performed group by group.
3- Method according to claim 1, characterized in that said second stage is also performed simultaneously in several printing groups (G1 to G8).
4. Method according to claim 1, characterized in that said second fine adjustment stage is carried out with monitoring of the driving torque of at least one of said printing cylinders (2) and inking (3).
5. Method according to any one of the preceding claims, characterized in that said first stage also comprises monitoring the torque of the positioning motors (8, 9, 10, 11).
6. Method according to claim 5, characterized in that said positioning motors (8, 9, 10, 11) operate in at least said first stage in a torque limitation or reduced torque mode.
7. Method according to claim 1, characterized in that said linear displacements are carried out alternatively by actuating the positioning motors (8, 9, 10, 11) on one end of an axis bearing the cylinders (2, 3), on the other extreme or over both at the same time.
8- Method according to claim 1, characterized in that said first stage is performed by applying a variable tangential speed to the material supported in the central counterpressure cylinder (1) and to the printing cylinders (2) and inking (3).
9. Method according to claim 8, characterized in that said first stage is performed by applying a tangential speed difference between the material supported in the central counterpressure cylinder (1) and the printing cylinders (2) and inking (3).
10. Method according to claim 9, characterized in that said first stage is performed by applying a tangential speed difference between the printing cylinders (2) and inking (3).
5 11.- Flexographic printing machine, comprising:
-
 a central counterpressure cylinder (1), rotatable, and at least one printing cylinder (2) and an inking cylinder (3), rotatable and linearly operable;
-
 drive means (4, 5) for carrying out said rotational drives 10;
-
 drive means (8, 9, 10, 11) for carrying out said linear drives;
-
 at least one image acquisition unit (C) of the printed material;
-
 means for the measurement of torque arranged to detect the torque of at least said printing cylinder (2); Y
-
 a control unit, in connection with said turning torque detection means and with said image acquisition unit (C), and intended to implement the method according to any one of the preceding claims.
12. Flexographic printing machine according to the preceding claim, comprising means for measuring the torque arranged to detect the torque of both printing cylinders (2) and inking (3).
SPANISH OFFICE OF THE PATENTS AND BRAND
Application no .: 201100920
SPAIN
Date of submission of the application: 12.08.2011
Priority Date:
REPORT ON THE STATE OF THE TECHNIQUE
51 Int. Cl.: B41F13 / 24 (2006.01) B41F13 / 34 (2006.01)
RELEVANT DOCUMENTS
Category
56 Documents cited Claims Affected
Y
WO 2010 142405 A2 (WINDMOELLER & HOELSCHER et al.) 16.12.2010, paragraphs [0034-0045]; figures. 1-12
Y
EP 1249346 A1 (WINDMOELLER & HOELSCHER) 16.10.2002, paragraphs [0020-0034]; figures. 1-12
TO
EP 0990520 A1 (FISCHER & KRECKE GMBH & CO) 05.04.2000, the whole document. 1.4-12
TO
EP 1018426 A1 (FISCHER & KRECKE GMBH & CO) 12.07.2000, paragraphs [0014-0025]; figures. 1-12
TO
EP 0788879 A1 (BOBST SA) 13.08.1997, column 7, line 21 - column 12, line 45; figures. 1-12
Category of the documents cited X: of particular relevance Y: of particular relevance combined with other / s of the same category A: reflects the state of the art O: refers to unwritten disclosure P: published between the priority date and the date of priority submission of the application E: previous document, but published after the date of submission of the application
This report has been prepared • for all claims □ for claims no:
Date of realization of the report 21.11.2012
Examiner G. Villarroel Álvaro Page 1/4
REPORT OF THE STATE OF THE TECHNIQUE
Application number: 201100920
Minimum documentation sought (classification system followed by classification symbols) B41F Electronic databases consulted during the search (database name and, if possible, terms of
search used) INVENES, EPODOC
State of the Art Report Page 2/4
 WRITTEN OPINION
Application number: 201100920
Date of Written Opinion: 21.11.2012
Statement
Novelty (Art. 6.1 LP 11/1986)
Claims Claims 1-12 IF NOT
Inventive activity (Art. 8.1 LP11 / 1986)
Claims Claims 1-12 IF NOT
The application is considered to comply with the industrial application requirement. This requirement was evaluated during the formal and technical examination phase of the application (Article 31.2 Law 11/1986).
 Opinion Base.
This opinion has been made on the basis of the patent application as published.
State of the Art Report Page 3/4
 WRITTEN OPINION
Application number: 201100920
1. Documents considered.
The documents belonging to the state of the art taken into consideration for the realization of this opinion are listed below.
Document
Publication or Identification Number publication date
D01
WO 2010 142405 A2 (WINDMOELLER & HOELSCHER et al.) 16.12.2010
D02
EP 1249346 A1 (WINDMOELLER & HOELSCHER) 16.10.2002
D03
EP 0990520 A1 (FISCHER & KRECKE GMBH & CO) 05.04.2000
D04
EP 1018426 A1 (FISCHER & KRECKE GMBH & CO) 12.07.2000
D05
EP 0788879 A1 (BOBST SA) 13.08.1997
2. Statement motivated according to articles 29.6 and 29.7 of the Regulations for the execution of Law 11/1986, of March 20, on Patents on novelty and inventive activity; quotes and explanations in support of this statement
The method of adjustment of pressures that the application is intended to be included in the state of the art since documents are found detailing a flexographic machine with the elements that are included in the preamble of the first Claim (see for example the documents D01 and D02) and also the method referenced in the first (see document D01) and second (see document D02) steps, therefore, taking both into consideration and for one skilled in the art, said first claim lacks inventive activity.
Going deeper into the aforementioned documents, the D01 proposes a flexographic printer and a procedure to adjust the cylinders of the same in which the actuation of the cylinders of the inking group is controlled by means of a control unit (also included in the D02 with equal purpose), which monitors the torque of the cylinder drive motors, anticipating the first stage of the application method. Document D02 details a device and method for adjusting printing on a rotary machine by adjusting the relative position of the printing rollers in which a camera that takes images and sends them to a control unit is provided and electronic regulation that operates the rollers and their drive motors, thus achieving optimum printing by test, as indicated in the second stage of the claimed method.
Both documents are considered to also nullify the inventive activity of claims 11 and 12.
Regarding the dependent claims, it is added that it is not considered inventive to carry out the adjustment simultaneously or sequentially in the printing groups since only a multiple control unit is needed and in that way the method does not vary or is affected object of the first claim.
In addition to those already mentioned D01 and D02, another example of monitoring the driving torque of the printing cylinders and / or of the positioning motors can be seen in document D03 (column 3, line 61 and following).
As for the operation of the torque-limiting positioning motors, mention of such a condition is obtained in document D01 which expressly indicates how the current produced by the torque in the cylinder drive is reduced. The fact of moving the cylinders by varying the tangential speed of the material supported in the central counterpressure cylinder and those of printing and inking is considered a work option that exists in the technical field at hand (see D01 paragraph 0042), also being possible the variation of the angular velocity (see document D03 column 4, line 54 and ss) whose direct consequence is the variation of the mentioned tangential velocity (having the data of the diameter of the cylinders) and / or the relative difference between the tangential velocities of printing and inking cylinders.
Common elements can be seen with the method and printer claimed in documents D04 and D05.
Therefore and according to all the above, it is considered that the invention as a whole lacks inventive activity according to article 8.1 of Patent Law 11/1986.
State of the Art Report Page 4/4
ES201100920A 2011-08-12 2011-08-12 Method for pressure adjustment in a flexographic printer machine and flexographic printer machine for implementation. Expired - Fee Related ES2395183B1 (en)

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ES201100920A ES2395183B1 (en) 2011-08-12 2011-08-12 Method for pressure adjustment in a flexographic printer machine and flexographic printer machine for implementation.

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Application Number Priority Date Filing Date Title
ES201100920A ES2395183B1 (en) 2011-08-12 2011-08-12 Method for pressure adjustment in a flexographic printer machine and flexographic printer machine for implementation.
DE201220000246 DE202012000246U1 (en) 2011-08-12 2012-01-12 flexographic printing
PCT/ES2012/000219 WO2013024186A1 (en) 2011-08-12 2012-08-09 Method for the adjustment of pressures in a flexographic printing press and flexographic printing press for the implementation thereof

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ES2395183A1 ES2395183A1 (en) 2013-02-08
ES2395183B1 true ES2395183B1 (en) 2013-11-28

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Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
EP2660056B1 (en) * 2012-05-02 2018-04-18 Advanced Vision Technology (AVT) Ltd. Method and system for setting the contact pressure of the cylinders of a printing press without requiring special targets
DE102014101433B4 (en) * 2014-02-05 2016-03-24 CONPRINTA GmbH & Co. KG Printing unit for a flexographic printing machine and method for its operation
DE102016215748A1 (en) 2016-08-23 2018-03-01 Robert Bosch Gmbh Flexographic printing machine with different peripheral speeds on the anilox roller and the plate cylinder

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CH691225A8 (en) * 1996-02-09 2001-08-15 Bobst Sa Rotary printing machine.
EP0990520B1 (en) * 1998-08-29 2001-11-28 FISCHER & KRECKE GMBH & CO. Method and device for preventing collision in printing machines
DE19900258A1 (en) * 1999-01-07 2000-07-13 Fischer & Krecke Gmbh & Co Method for positioning two cylinders of a printing press against one another
DE20122584U1 (en) * 2001-03-27 2006-07-27 Windmöller & Hölscher Kg Print image setting device for rotary printing machine has camera feeding successively acquired print images to control or regulating unit that produces signals for participating rollers
DE102005004972A1 (en) 2005-02-03 2006-08-10 Windmöller & Hölscher Kg register process
DE602006012688D1 (en) 2006-10-23 2010-04-15 Fischer & Krecke Gmbh Method, Monatagevorrichtung and control unit for adjusting a roller in a printing press
ES2300209B1 (en) 2006-11-22 2009-05-01 Comexi, S.A. Method of positional adjustment of printer bodies in flexographic printer machines.
DE102009025053A1 (en) * 2009-06-10 2010-12-16 Windmöller & Hölscher Kg Device and method for mutual hiring at least two cylinders of a printing press

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DE202012000246U1 (en) 2012-05-02
ES2395183A1 (en) 2013-02-08
WO2013024186A1 (en) 2013-02-21

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