EP1435292A1 - Process and system for automatically loading and unloading matrix printing plates on cylinders for printing assemblies for flexographic printing machines - Google Patents
Process and system for automatically loading and unloading matrix printing plates on cylinders for printing assemblies for flexographic printing machines Download PDFInfo
- Publication number
- EP1435292A1 EP1435292A1 EP03425001A EP03425001A EP1435292A1 EP 1435292 A1 EP1435292 A1 EP 1435292A1 EP 03425001 A EP03425001 A EP 03425001A EP 03425001 A EP03425001 A EP 03425001A EP 1435292 A1 EP1435292 A1 EP 1435292A1
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- EP
- European Patent Office
- Prior art keywords
- matrix
- holding cylinder
- plate
- plates
- cam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F27/00—Devices for attaching printing elements or formes to supports
- B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
- B41F27/1206—Feeding to or removing from the forme cylinder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F3/00—Cylinder presses, i.e. presses essentially comprising at least one cylinder co-operating with at least one flat type-bed
- B41F3/46—Details
- B41F3/81—Inking units
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F31/00—Inking arrangements or devices
- B41F31/02—Ducts, containers, supply or metering devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F9/00—Rotary intaglio printing presses
- B41F9/06—Details
- B41F9/08—Wiping mechanisms
- B41F9/10—Doctors, scrapers, or like devices
- B41F9/1081—Doctors, scrapers, or like devices using two or more blades
Definitions
- the present invention refers to a process and a system for automatically loading and unloading matrix printing plates on matrix-holding cylinders used in printing assemblies for rotating machines for flexographic printing.
- every matrix-holding cylinder contains 8 plates to be placed on its surface, and where, in a printing machine, there are a plurality of printing assemblies, each one containing four cylinders (for four-colour printing), the cylinders can easily reach 40 as a number and the total plates 320 as a number. With these numbers, it is evident that, as it often occurs when printing newspapers, when it is necessary to replace at the last possible moment and quickly one or more plates in particular cylinder positions and in particular printing assemblies, the operations of removing the old plate and of replacing it with a new plate require long times by a single operator, or require the presence of many operators, in the end creating long, complex and costly processes.
- Object of the present invention is solving the above-said prior art problems, providing a completely automated process and system for loading and unloading matrix printing plates on or from matrix-holding cylinders, thereby removing all manual prior art operations, reducing tooling times and costs and reducing the number of working operators.
- a further object of the present invention is providing a process and a device of the above-mentioned type that allow automating also the steps upstream of those of installing the plates, thereby providing a completely automated line in which the plates are prepared in composition, recognised by readers and sensors, and then transported downstream for the automatic assembling on matrix-holding cylinders.
- Such system substantially comprises:
- the above-mentioned system can further comprise attracting means 34 for attracting the front end of the plate 1 in a position adapted to facilitate its supply on the matrix-holding cylinder 3 or its supply on the receiving means 7.
- every matrix-holding cylinder 3 is adapted to contain a plurality of matrix printing plates 1 on its external surface, and each one of the plates 1 comprises an identification code (not shown); with such configuration, adapted for the final, completely automated solution, the system further comprises:
- the above-described system can further comprise strongly-attracting means 36 (for example at least one electromagnet) placed in the receiving means 7: such strongly-attracting means 36 attract the plate 1 against the receiving means 7 by overcoming the thrust force provided by the rotation of the matrix-holding cylinder 3, and thereby the plate 1 is kept in a fixed and unmoving position on the receiving means 7 by the strongly-attracting means 36 to realise the final unloading of the plate 1 from the cylinder 3.
- strongly-attracting means 36 for example at least one electromagnet
- the above-described system is adapted to realise the loading and unloading of plates 1 according to the established means and sequences; if a completely automated operation of unloading already-installed plates 1 on the cylinder 3 is also made necessary, the system is further equipped with:
- Pushing means 8 (composed of at least one piston) can further be present for pushing the plate 1 in an operating position on the hooking recess that can be found on the cylinder 3.
- the receiving and inserting means 7 can be composed of a frame 7 that is extended for the whole longitudinal extension of the matrix-holding cylinder 3: such frame 7 is equipped with holding means 40 of the plates 1 against the frame 7 during their sliding movement on the frame 7.
- the frame 7 is further equipped with detecting means 42 for the position of the plates 1, in which the detecting means 42 are adapted to rotatingly control the matrix-holding cylinder 3 in order to phase its position with respect to the advancement of the plates 1 for their phased loading or unloading on or from the cylinder 3.
- the holding means 40 are composed of a plurality of magnets 40 and the detecting means 42 are composed of a plurality of sensors 42.
- the frame 7 can be further equipped with rotating means 44 (preferably composed of a plurality of rubber wheels 44) whose rolling action facilitates the displacement of the plates 1 on the frame 7.
- the pressing means 12 are composed of at least one rubber wheel 12
- the attracting means 34 are composed of at least one magnet 34.
- the opening means 16, 18, 20, 22, 24, 26 are composed of a first and a second wheel 16, 18 adapted to roll onto the surface of the control means 28: the first and second wheels 16, 18 are respectively integral (through a junction 19) with a third and a fourth wheel 20, 22, that are adapted to control the mobile hooking means 23 and that are placed at an end of a respective toothed shaft 24, 26.
- the movement of the movable hooking means 23 is transferred, for the whole extension of the matrix-holding cylinder 3, from the wheels 16, 18, 20, 22 to the movable hooking means 23 themselves through the toothed shafts 24, 25 that are mechanically connected to the movable hooking means 23.
- control means 28, 30, 32 are preferably composed of a cam 28 adapted to engage the first and second wheels 16, 18 during a rotation of the matrix-holding cylinder 3 in order to move the first and second wheels 16, 18 in an opening position of the mobile hooking means 23; then, the cam 28 is adapted to release the engagement of the first and second wheels 16, 18 during a further rotation of the matrix-holding cylinder 3 in order to snap the mobile hooking means 23 in engagement with the rear end of the plate 1, and moreover the cam 28 is adapted to assume a rest position, in which the cam 28 does not interfere with the rotation of the matrix-holding cylinder 3 and does not engage the first and second wheels 16, 18: the cam 28 assumes such rest position through the pull of elastic means 30 (commonly a pair of springs 30).
- the cam 28 is adapted to further assume a working position, in which it engages the first and/or second wheel 16, 18, and the cam 28 assumes such working position through the thrust of piston means 32 (commonly in a number of two, to guarantee an uniform thrust of the cam 28 itself to its working position).
- the piston means 32 are adapted to move the cam 28 in three respective working positions, one in engagement with the first wheel 16 only, one in engagement with the second wheel 18 only and one in engagement both with the first wheel 16 and with the second wheel 18, to allow the engagement of three possible combinations of plates 1 on the matrix-holding cylinder 3.
- the described system performs the loading operations when the cylinder 3 moves along a direction (called A), while it performs the unloading operations when the cylinder 3 moves in a direction (called B) whose sense is opposite with respect to the one of the loading direction A.
- every matrix-holding cylinder 3 contains eight matrix printing plates 1 mutually placed side by side on its external surface. It is obviously possible to provide for other cylinder configurations, containing a greater or lower number of plates 1, according to the end product that has to be obtained.
- the process for automatically loading matrix printing plates 1 on matrix-holding cylinders 3 on printing assemblies 5 for rotary flexographic printing machines of the present invention substantially comprises the steps of:
- the above-describe process can further comprise, before the step of pushing the front end of the plate 1 in contact with the fixed hooking means 9 of the matrix-holding cylinder 3, the further step of attracting, through the attraction means 34, the front end in a position that is adapted to facilitate the following step of pushing.
- every matrix-holding cylinder 3 contains a plurality of matrix printing plates 1 on its external surface, and each one of the plates 1 comprises an identification code
- the process further comprises the steps of:
- the above-mentioned unloading process can also comprise, after the step of placing the rear end of the plate 1 above the end of the means 7 for receiving the plate 1, the further step of attracting, through the attraction means 34, the rear end of the plate 1 outside the recess in the matrix-holding cylinder 3 in which the mobile hooking means 23 are placed.
- every matrix-holding cylinder 3 is adapted to contain a plurality of matrix printing plates 1 on its external surface, and each of the plates 1 comprises an identification code, there are provided the further steps of:
- the preferred embodiment deals with printing assemblies 5 in which there are four matrix-holding cylinders 3 to realise the four-colour printing.
- each cylinder 3 it has been necessary to arrange and place the respective frame 7 in mutually different positions and orientations, that all allowed the optimal use of the frame 7 for loading and unloading the plates 1: the optimum arrangement of the various frames 7 and cylinders 3 for the printing assembly with four cylinders 3 is the one shown in the drawings. It would obviously be possible to realise other mutual arrangements of frame 7 e cylinder 3 that obtain the same functionality, without departing from the scope of the invention, as pointed out by the enclosed Claims.
Abstract
Description
- The present invention refers to a process and a system for automatically loading and unloading matrix printing plates on matrix-holding cylinders used in printing assemblies for rotating machines for flexographic printing.
- In the flexographic printing field, for example for printing newspapers or various publications, it is necessary to load and unload matrix printing plates on matrix-holding cylinders through a first securing operation to fixed hooking means of the cylinder and then, after having rotated the cylinder, an opening operation of mobile hooking means in order to place thereon the rear end of the plate for the final fixing. All above-listed operations, including opening of the mobile hooking means, are manually performed, with obvious problems of times, accuracy and dangers for the operators (since the plates are made of metallic material and have cutting edges).
- In applications implying the printing of newspapers, where every matrix-holding cylinder contains 8 plates to be placed on its surface, and where, in a printing machine, there are a plurality of printing assemblies, each one containing four cylinders (for four-colour printing), the cylinders can easily reach 40 as a number and the total plates 320 as a number. With these numbers, it is evident that, as it often occurs when printing newspapers, when it is necessary to replace at the last possible moment and quickly one or more plates in particular cylinder positions and in particular printing assemblies, the operations of removing the old plate and of replacing it with a new plate require long times by a single operator, or require the presence of many operators, in the end creating long, complex and costly processes.
- While in the offset printing field there have been disclosed some partially-automated arrangements in plate-hooking operations (for example in documents DE-A-10024087 or DE-A-10139292), the different structure of plates of the offset type (that are generally made of aluminium and therefore are of a metallic, but not magnetic, material, differently from plates for flexographic printing) and the different needs for their connection to cylinders imply solutions that cannot be applied to the flexographic printing field. In such field, instead, there are nowadays no processes or systems that allow automatically loading or unloading plates on or from matrix-holding cylinders.
- Object of the present invention is solving the above-said prior art problems, providing a completely automated process and system for loading and unloading matrix printing plates on or from matrix-holding cylinders, thereby removing all manual prior art operations, reducing tooling times and costs and reducing the number of working operators.
- A further object of the present invention is providing a process and a device of the above-mentioned type that allow automating also the steps upstream of those of installing the plates, thereby providing a completely automated line in which the plates are prepared in composition, recognised by readers and sensors, and then transported downstream for the automatic assembling on matrix-holding cylinders.
- The above and other objects and advantages of the invention, as will readily appear from the following description, are obtained by a process and a system for loading the plates on matrix-holding cylinders, and by a process and a system for unloading the plates from matrix-holding cylinders as pointed out in the independent Claims. Preferred embodiments and non-trivial variations of the present invention are the object of the dependent Claims.
- The present invention will be better described by some preferred embodiments thereof, provided as a nonlimiting example, with reference to the enclosed drawings, in which:
- Figure 1 is a schematic side view of a printing assembly comprising four preferred embodiments of the system of the present invention in respective orientations according to the placement of the four matrix-holding cylinders used for four-colour printing;
- Figure 2 is a schematic view that shows the positions of eight plates on two respective matrix-holding cylinders;
- Figure 3 is a front view of a matrix-holding cylinder and the frame;
- Figure 4 is a detailed view of the cylinder and of one of the plate-holding means;
- Figure 5 is a more detailed side sectional view of the printing assembly in Fig. 1;
- Figure 6 is an enlarged view of part of Fig. 5 that shows one of the four systems of the invention contained therein;
- Figure 7 is a side view that better shows the cam control means for the wheels of the system of the invention;
- Figure 7A is a front view corresponding to Fig. 7;
- Figure 8 is a front view of the wheels and the coaxial cylinders supporting them;
- Figures 9 to 12 are four top views of the four operating positions of the cam control means; and
- Figures 13 to 36 are views of the various detailed steps of the process of the invention, seen from two different operating positions.
- With reference to the Figures, a preferred embodiment of the system for automatically loading and unloading
plates 1 on and from matrix-holding cylinders 3 ofprinting assemblies 5 of flexographic printing machines, is shown. - Such system substantially comprises:
- means 7 for receiving and inserting the
plate 1 on the matrix-holdingcylinder 3; - fixed hooking means 9 for the matrix-holding
cylinder 3, commonly known in the art, that are adapted to hook the front end of theplate 1, after that it has been placed on themeans 7 and has been advanced till it engages the fixedhooking means 9; - pushing means 8 adapted to push the
plate 1 to engage the fixedhooking means 9; -
pressing means 12 for keeping theplate 1 in contact with the external surface of the matrix-holdingcylinder 3 during its rotation; - opening means 16, 18, 20, 22, 24, 26, controlled by
control means 28, 30, 32, adapted to open the mobile
hooking means 23 of the matrix-holding
cylinder 3 during a first rotation of thecylinder 3 to place thereon the rear end of theplate 1, and adapted to close themobile hooking means 23 in gripping engagement with the rear end of theplate 1. - For a better final operation, as will be described below, the above-mentioned system can further comprise attracting
means 34 for attracting the front end of theplate 1 in a position adapted to facilitate its supply on the matrix-holdingcylinder 3 or its supply on thereceiving means 7. - According to the embodiment shown, every matrix-
holding cylinder 3 is adapted to contain a plurality ofmatrix printing plates 1 on its external surface, and each one of theplates 1 comprises an identification code (not shown); with such configuration, adapted for the final, completely automated solution, the system further comprises: - means for programming a loading sequence of the
plates 1 on the matrix-holding cylinder 3, in which such programmed sequence is stored in a central control and command unit (not shown), and in which the sequence establishes the identification code of therespective plate 1 to be placed in one of the foreseen positions on the matrix-holding cylinder 3; - means for automatically supplying the plurality of
plates 1 onto the receiving and inserting means 7; - means for reading the identification code of each one
of the
plates 1 and coupling it with the identification code of the programmed sequence; and - means for loading each one of the
plates 1 onto the matrix-holding cylinder 3 according to the programmed sequence contained in the central control and command unit. - Moreover, the above-described system can further comprise strongly-attracting means 36 (for example at least one electromagnet) placed in the receiving means 7: such strongly-attracting
means 36 attract theplate 1 against thereceiving means 7 by overcoming the thrust force provided by the rotation of the matrix-holdingcylinder 3, and thereby theplate 1 is kept in a fixed and unmoving position on thereceiving means 7 by the strongly-attractingmeans 36 to realise the final unloading of theplate 1 from thecylinder 3. - The above-described system is adapted to realise the loading and unloading of
plates 1 according to the established means and sequences; if a completely automated operation of unloading already-installedplates 1 on thecylinder 3 is also made necessary, the system is further equipped with: - means for programming a sequence of unloading of
plates 1 from the matrix-holding cylinder 3, in which such programmed sequence is stored in a central control and command unit, and in which the sequence establishes the identification code of therespective plate 1 to be extracted from one of the provided positions on the matrix-holding cylinder 3; and - means for unloading each one of the
plates 1 from the matrix-holdingcylinder 3 on thereceiving means 7 according to the programmed sequence contained in the central control and command unit. - Pushing means 8 (composed of at least one piston) can further be present for pushing the
plate 1 in an operating position on the hooking recess that can be found on thecylinder 3. - The Figures show a practical preferred, but nonlimiting, embodiment of the system of the invention. According to what is shown in such Figures, therefore, for example the receiving and inserting
means 7 can be composed of aframe 7 that is extended for the whole longitudinal extension of the matrix-holding cylinder 3:such frame 7 is equipped withholding means 40 of theplates 1 against theframe 7 during their sliding movement on theframe 7. Theframe 7 is further equipped withdetecting means 42 for the position of theplates 1, in which the detecting means 42 are adapted to rotatingly control the matrix-holdingcylinder 3 in order to phase its position with respect to the advancement of theplates 1 for their phased loading or unloading on or from thecylinder 3. - In particular, the holding means 40 are composed of a plurality of
magnets 40 and the detecting means 42 are composed of a plurality ofsensors 42. - Moreover, the
frame 7 can be further equipped with rotating means 44 (preferably composed of a plurality of rubber wheels 44) whose rolling action facilitates the displacement of theplates 1 on theframe 7. - In the above-described preferred embodiment of the system, moreover, the pressing
means 12 are composed of at least onerubber wheel 12, and the attractingmeans 34 are composed of at least onemagnet 34. - Still more, the opening means 16, 18, 20, 22, 24, 26 are composed of a first and a
second wheel second wheels fourth wheel 20, 22, that are adapted to control the mobile hooking means 23 and that are placed at an end of arespective toothed shaft cylinder 3, from thewheels toothed shafts 24, 25 that are mechanically connected to the movable hooking means 23. - Moreover, the control means 28, 30, 32 are preferably composed of a
cam 28 adapted to engage the first andsecond wheels cylinder 3 in order to move the first andsecond wheels cam 28 is adapted to release the engagement of the first andsecond wheels cylinder 3 in order to snap the mobile hooking means 23 in engagement with the rear end of theplate 1, and moreover thecam 28 is adapted to assume a rest position, in which thecam 28 does not interfere with the rotation of the matrix-holdingcylinder 3 and does not engage the first andsecond wheels 16, 18: thecam 28 assumes such rest position through the pull of elastic means 30 (commonly a pair of springs 30). Finally, thecam 28 is adapted to further assume a working position, in which it engages the first and/orsecond wheel cam 28 assumes such working position through the thrust of piston means 32 (commonly in a number of two, to guarantee an uniform thrust of thecam 28 itself to its working position). - In particular, the piston means 32 are adapted to move the
cam 28 in three respective working positions, one in engagement with thefirst wheel 16 only, one in engagement with thesecond wheel 18 only and one in engagement both with thefirst wheel 16 and with thesecond wheel 18, to allow the engagement of three possible combinations ofplates 1 on the matrix-holding cylinder 3. - The described system performs the loading operations when the
cylinder 3 moves along a direction (called A), while it performs the unloading operations when thecylinder 3 moves in a direction (called B) whose sense is opposite with respect to the one of the loading direction A. - Moreover, in case of printing newspapers as shown in the Figures (where for clarity the wider printing stations each comprising a plurality of
printing assemblies 5 have been omitted), every matrix-holding cylinder 3 contains eightmatrix printing plates 1 mutually placed side by side on its external surface. It is obviously possible to provide for other cylinder configurations, containing a greater or lower number ofplates 1, according to the end product that has to be obtained. - With the above-described system, it is possible to realise, with the same equipment, a process for loading and a process for unloading
plates 1 on and from matrix-holding cylinders 3 as described below. - First of all, the process for automatically loading
matrix printing plates 1 on matrix-holding cylinders 3 onprinting assemblies 5 for rotary flexographic printing machines of the present invention substantially comprises the steps of: - placing at least one
matrix printing plate 1 on themeans 7 for receiving and inserting theplate 1 on the matrix-holdingcylinder 3; - slidingly advancing the
plate 1 on the receiving and inserting means 7 till the front end of theplate 1 arrives at a coupling position with the matrix-holdingcylinder 3; - pushing, through the pushing means 8, the front end of
the
plate 1 in contact with the fixed hooking means 9 of the matrix-holdingcylinder 3; - rotating (direction A) the matrix-holding
cylinder 3 till the fixed hooking means 9 engage the front grippingedge 11 of theplate 1; - freeing the
plate 1 from the pushing of the pushing means 8 engaged with the matrix-holdingcylinder 3; - rotating (direction A) the matrix-holding
cylinder 3 keeping theplate 1 in contact with its external surface through thepressing means 12; - opening, through the opening means 16, 18, 20, 22, 24,
26 controlled by the control means 28, 30, 32, the
mobile hooking means 23 of the matrix-holding
cylinder 3 when thecylinder 3 rotates; - after a 180° rotation (direction A) of the matrix-holding
cylinder 3, placing the rear end of theplate 1 next to the opened mobile hookingmeans 23; and - closing the mobile hooking
means 23 engaging the rear end of theplate 1 through the control means 28, 30, 32. - The above-describe process can further comprise, before the step of pushing the front end of the
plate 1 in contact with the fixed hookingmeans 9 of the matrix-holdingcylinder 3, the further step of attracting, through the attraction means 34, the front end in a position that is adapted to facilitate the following step of pushing. - Moreover, in the configuration where every matrix-holding
cylinder 3 contains a plurality ofmatrix printing plates 1 on its external surface, and each one of theplates 1 comprises an identification code, the process further comprises the steps of: - programming a loading sequence of the
plates 1 on the matrix-holdingcylinder 3, in which such programmed sequence is stored in a central control and command unit, and in which the sequence establishes the identification code of therespective plate 1 to be placed in one of the foreseen positions on the matrix-holdingcylinder 3; - automatically supplying the plurality of
plates 1 onto the receiving and insertingmeans 7; - reading the identification code of each one of the
plates 1 and coupling it with the identification code of the programmed sequence; and - loading each one of the
plates 1 onto the matrix-holdingcylinder 3 according to the programmed sequence contained in the central control and command unit. - With the same system, a process for automatically unloading
matrix printing plates 1 from matrix-holdingcylinders 3 is also realised, in which the following steps are substantially provided: - opening the mobile hooking
means 23 of the matrix-holdingcylinder 3 through the control means 28, 30, 32 disengaging the mobile hooking means 23 from the rear end of theplate 1; - through a rotation (direction B) of the matrix-holding
cylinder 3, placing the rear end of theplate 1 above the end of themeans 7 for receiving theplate 1; - through a further rotation (direction B) of the matrix-holding
cylinder 3, sliding theplate 1 onto the receiving means 7 keeping theplate 1 in contact with the receiving means 7 on one hand, and in contact with the surface of the matrix-holdingcylinder 3 on the other hand that has still not come in contact with the receiving means 7; - through a further rotation (direction B) of the matrix-holding
cylinder 3 till a global rotation of 180° is performed, taking the recess in which the fixed hookingmeans 9 of the matrix-holdingcylinder 3 are placed, and therefore the front end of theplate 1, in engagement with the fixed hookingmeans 9, next to the area in which the receiving means 7 are placed; - activating the strongly-attracting
means 36 placed in the receiving means 7, so that the strongly-attractingmeans 36 attract theplate 1 against the receiving means 7 overcoming the pushing force exerted by the rotation of the matrix-holding cylinder 3: theplate 1 is kept in a fixed and unmoving position onto the receiving means 7 by the strongly-attractingmeans 36; - through a further rotation (direction B) of the matrix-holding
cylinder 3, freeing the unmoving front end of theplate 1 from the engagement with the fixed hookingmeans 9; and - deactivating the strongly-attracting
means 36 in order to allow removing theplate 1 from the receiving means 7. - The above-mentioned unloading process can also comprise, after the step of placing the rear end of the
plate 1 above the end of themeans 7 for receiving theplate 1, the further step of attracting, through the attraction means 34, the rear end of theplate 1 outside the recess in the matrix-holdingcylinder 3 in which the mobile hookingmeans 23 are placed. - Also in this unloading process, in the configuration where every matrix-holding
cylinder 3 is adapted to contain a plurality ofmatrix printing plates 1 on its external surface, and each of theplates 1 comprises an identification code, there are provided the further steps of: - programming a sequence of unloading of
plates 1 from the matrix-holdingcylinder 3, in which such programmed sequence is stored in a central control and command unit, and in which the sequence establishes the identification code of therespective plate 1 to be extracted from one of the provided positions on the matrix-holdingcylinder 3; and - unloading each one of the
plates 1 from the matrix-holdingcylinder 3 on the receiving means 7 according to the programmed sequence contained in the central control and command unit. - With reference, finally, to Figures 13 to 36, the various detailed steps of the process of the invention are show, seen from two different operating positions. In particular, the various detailed operating steps are as follows:
- angular positioning of the matrix-holding
cylinder 3 for depositing plates (Fig. 13); - moving the
rubber wheel 12 onto the cylinder 3 (Fig. 14); - manual depositing of plate one (Fig. 14);
- starting the rotation of the matrix-holding cylinder 3 (Fig. 14);
- actuating the
piston 8 for plate one o.s. (operator side) (Fig. 15); - actuating the
piston 8 for plate one o.s. (Fig. 16); - actuating the
cam 28 on o.s. (Fig. 17); - actuating the
piston 8 for plate one on transfer side (t.s.) (Fig. 18); - actuating the
piston 8 for plate one t.s. (Fig. 19) ; - verifying position of
cam 28 o.s. (Fig. 20); - actuating the
cam 28 t.s. (Fig. 21); - actuating unlock of plate one o.s. (Fig. 22);
- actuating unlock of plate two o.s. (Fig. 23);
- actuating unlock of plate one o.s. (Fig. 24);
- actuating unlock of plate two o.s. (Fig. 25);
- verifying position of
cam 28 t.s. (Fig. 26); - actuating the
cam 28 o.s. (Fig. 27); - actuating unlock of plate three t.s. (Fig. 28);
- actuating unlock of plate four t.s. (Fig. 29);
- actuating unlock of plate three t.s. (Fig. 30);
- actuating unlock of plate four t.s. (Fig. 31);
- verifying position of
cam 28 o.s. (Fig. 32); - actuating the
cam 28 t.s. (Fig. 33); - verifying position of
cam 28 t.s. (Fig. 34); - detaching the
rubber wheel 12 from the matrix-holding cylinder 3 (Fig. 35); and - stopping the rotation of matrix-holding cylinder 3 (Fig. 36).
- As can be seen by the Figures, the preferred embodiment deals with
printing assemblies 5 in which there are four matrix-holdingcylinders 3 to realise the four-colour printing. According to the position in which eachcylinder 3 is placed, it has been necessary to arrange and place therespective frame 7 in mutually different positions and orientations, that all allowed the optimal use of theframe 7 for loading and unloading the plates 1: the optimum arrangement of thevarious frames 7 andcylinders 3 for the printing assembly with fourcylinders 3 is the one shown in the drawings. It would obviously be possible to realise other mutual arrangements of frame 7e cylinder 3 that obtain the same functionality, without departing from the scope of the invention, as pointed out by the enclosed Claims.
Claims (37)
- Process for automatically loading matrix printing plates (1) on matrix-holding cylinders (3) on printing assemblies (5) for rotary flexographic printing machines, characterised in that it comprises the steps of:placing at least one matrix printing plate (1) on means (7) for receiving and inserting the plate (1) on the matrix-holding cylinder (3);slidingly advancing said plate (1) on said receiving and inserting means (7) till the front end of said plate (1) arrives at a coupling position with said matrix-holding cylinder (3);pushing, through pushing means (8), the front end of said plate (1) in contact with fixed hooking means (9) of said matrix-holding cylinder (3);rotating (direction A) said matrix-holding cylinder (3) till the fixed hooking means (9) engage the front gripping edge (11) of said plate (1);freeing said plate (1) from the pushing of said pushing means (8) engaged with the matrix-holding cylinder (3);rotating (direction A) the matrix-holding cylinder (3) keeping said plate (1) in contact with its external surface through pressing means (12);opening, through opening means (16, 18, 20, 22, 24, 26) controlled by control means (28, 30, 32), the mobile hooking means (23) of said matrix-holding cylinder (3) when said cylinder (3) rotates;after a 180° rotation (direction A) of said matrix-holding cylinder (3), placing the rear end of said plate (1) next to said opened mobile hooking means (23) ; andclosing said mobile hooking means (23) engaging the rear end of said plate (1) through said control means (28, 30, 32).
- Process according to Claim 1, characterised in that it comprises, before said step of pushing the front end of said plate (1) in contact with the fixed hooking means (9) of said matrix-holding cylinder (3), the further step of attracting, through attraction means (34), said front end in a position that is adapted to facilitate the following step of pushing.
- Process according to Claim 1 or 2, wherein every matrix-holding cylinder (3) is adapted to contain a plurality of matrix printing plates (1) on its external surface, and each one of said plates (1) comprises an identification code, characterised in that it further comprises the steps of:programming a loading sequence of the plates (1) on the matrix-holding cylinder (3), said programmed sequence being stored in a central control and command unit, said sequence establishing the identification code of the respective plate (1) to be placed in one of the foreseen positions on the matrix-holding cylinder (3);automatically supplying the plurality of plates (1) onto said receiving and inserting means (7);reading the identification code of each one of said plates (1) and coupling it with the identification code of the programmed sequence; andloading each one of said plates (1) onto said matrix-holding cylinder (3) according to the programmed sequence contained in said central control and command unit.
- Process for automatically unloading matrix printing plates (1) from matrix-holding cylinders (3) on printing assemblies (5) for rotary flexographic printing machines, characterised in that it comprises the steps of:opening the mobile hooking means (23) of said matrix-holding cylinder (3) through control means (28, 30, 32) disengaging said mobile hooking means (23) from the rear end of said plate (1);through a rotation (direction B) of said matrix-holding cylinder (3), placing the rear end of said plate (1) above an end of means (7) for receiving the plate (1);through a further rotation (direction B) of said matrix-holding cylinder (3), sliding said plate (1) onto said receiving means (7) keeping said plate (1) in contact with said receiving means (7) on one hand, and in contact with the surface of said matrix-holding cylinder (3) on the other hand, such surface having still not come in contact with said receiving means (7);through a further rotation (direction B) of said matrix-holding cylinder (3) till a global rotation of 180° is performed, taking the recess in which the fixed hooking means (9) of said matrix-holding cylinder (3) are placed, and therefore the front end of said plate (1) in engagement with said fixed hooking means (9), next to the area in which said receiving means (7) are placed;activating strongly-attracting means (36) placed in said receiving means (7), said strongly-attracting means (36) attracting said plate (1) against said receiving means (7) overcoming the pushing force exerted by the rotation of said matrix-holding cylinder (3), said plate (1) being kept in a fixed and unmoving position onto said receiving means (7) by said strongly-attracting means (36);through a further rotation (direction B) of said matrix-holding cylinder (3), freeing the unmoving front end of said plate (1) from the engagement with said fixed hooking means (9); anddeactivating said strongly-attracting means (36) in order to allow removing said plate (1) from said receiving means (7).
- Process according to Claim 4, characterised in that it comprises, after said step of placing the rear end of said plate (1) above the end of the means (7) for receiving the plate (1), the further step of attracting, through attraction means (34), the rear end of said plate (1) outside the recess in said matrix-holding cylinder (3) in which said mobile hooking means (23) are placed.
- Process according to Claim 4 or 5, wherein every matrix-holding cylinder (3) is adapted to contain a plurality of matrix printing plates (1) on its external surface, and each of said plates (1) comprises an identification code, characterised in that it further comprises the steps of:programming a sequence of unloading of plates (1) from the matrix-holding cylinder (3), said programmed sequence being stored in a central control and command unit, said sequence establishing the identification code of the respective plate (1) to be extracted from one of the provided positions on the matrix-holding cylinder (3); andunloading each one of said plates (1) from said matrix-holding cylinder (3) on said receiving means (7) according to the programmed sequence contained in said central control and command unit.
- Process according to any one of the previous Claims, characterised in that said receiving and inserting means (7) are composed of a frame (7) that is extended for the whole longitudinal extension of said matrix-holding cylinder (3), said frame (7) being equipped with holding means (40) of said plates (1) against said frame (7) during their sliding movement on said frame (7), said frame (7) being further equipped with detecting means (42) for the position of said plates (1), said detecting means (42) being adapted to rotatingly control the matrix-holding cylinder (3) in order to phase its position with respect to the advancement of said plates (1) for their phased loading or unloading on or from said cylinder (3).
- Process according to Claim 7, characterised in that said holding means (40) are composed of a plurality of magnets (40) and said detecting means (42) are composed of a plurality of sensors (42).
- Process according to Claim 7 or 8, characterised in that said frame (7) is further equipped with rotating means (44) whose rolling action facilitates the displacement of said plates (1) on said frame (7).
- Process according to any one of the previous Claims, characterised in that said rotating means (44) are composed of a plurality of rubber wheels (44).
- Process according to any one of the previous Claims, characterised in that said pushing means (8) are composed of at least one piston (8).
- Process according to any one of the previous Claims, characterised in that said pressing means (12) are composed of at least one rubber wheel (12).
- Process according to any one of the previous Claims, characterised in that said attraction means (34) are composed of at least one magnet (34).
- Process according to any one of the previous Claims, characterised in that said opening means (16, 18, 20, 22, 24, 26) are composed of a first and a second wheel (16, 18) adapted to roll onto the surface of said control means (28), said first and second wheels (16, 18) being respectively integral (through a junction 19) with a third and a fourth wheel (20, 22) adapted to control said mobile hooking means (23), said third and fourth wheels (20,22) being placed at an end of a respective toothed shaft (24, 26), said toothed shafts (24, 26) transferring the movement of the movable hooking means (23) from the wheels (16, 18, 20, 22) to the movable hooking means (23) themselves, said toothed shafts (24, 25) being mechanically connected to the movable hooking means (23).
- Process according to any one of the previous Claims, characterised in that said control means (28, 30, 32) are composed of a cam (28) adapted to engage said first and second wheels (16, 18) during a rotation of said matrix-holding cylinder (3) in order to move said first and second wheels (16, 18) in an opening position of said mobile hooking means (23), said cam (28) being adapted to release the engagement of said first and second wheels (16, 18) during a further rotation of said matrix-holding cylinder (3) in order to snap said mobile hooking means (23) in engagement with the rear end of said plate (1), said cam (28) being adapted to assume a rest position, in which said cam (28) does not interfere with the rotation of said matrix-holding cylinder (3) and does not engage said first and second wheels (16, 18), said cam (28) assuming said rest position through the pull of elastic means (30), said cam (28) being adapted to further assume a working position, in which said cam (28) engages said first and/or second wheel (16, 18), said cam (28) assuming said working position through the thrust of piston means (32).
- Process according to Claim 15, characterised in that said piston means (32) are adapted to move said cam (28) in three respective working positions, one in engagement with the first wheel (16) only, one in engagement with the second wheel (18) only and one in engagement both with the first wheel (16) and with the second wheel (18), to allow the engagement of three possible combinations of plates (1) on the matrix-holding cylinder (3).
- Process according to any one of the previous Claims, characterised in that said strongly-attracting means (36) are composed of at least one electromagnet (36).
- Process according to any one of the previous Claims, characterised in that the loading direction (A) has a rotation direction that is opposite with respect to the one of the unloading direction (B).
- Process according to any one of the previous Claims, characterised in that every matrix-holding cylinder (3) contains eight matrix printing plates (1) mutually placed side by side on its external surface.
- System for automatically loading and unloading matrix printing plates (1) from matrix-holding cylinders (3) on and from printing assemblies (5) for rotary flexographic printing machines, characterised in that it comprises:means (7) for receiving and inserting the plate (1) on the matrix-holding cylinder (3);fixed hooking means (9) for said matrix-holding cylinder (3), said fixed hooking means (9) being adapted to hook the front end of the plate (1) placed on said means (7) and being advanced till it engages said fixed hooking means (9);pushing means (8) adapted to push said plate (1) to engage said fixed hooking means (9);pressing means (12) for keeping said plate (1) in contact with the external surface of said matrix-holding cylinder (3) during its rotation;opening means (16, 18, 20, 22, 24, 26), controlled by control means (28, 30, 32), adapted to open the mobile hooking means (23) of said matrix-holding cylinder (3) during a first rotation of said cylinder (3) to place thereon the rear end of said plate (1), and adapted to close the mobile hooking means (23) in gripping engagement with the rear end of said plate (1).
- System according to Claim 20, characterised in that it further comprises attracting means (34) for attracting the front end of said plate (1) in a position adapted to facilitate its supply on said matrix-holding cylinder (3) or its supply on said receiving means (7).
- System according to Claim 20 or 21, wherein every matrix-holding cylinder (3) is adapted to contain a plurality of matrix printing plates (1) on its external surface, and each one of said plates (1) comprises an identification code, characterised in that it further comprises:means for programming a loading sequence of the plates (1) on the matrix-holding cylinder (3), said programmed sequence being stored in a central control and command unit, said sequence establishing the identification code of the respective plate (1) to be placed in one of the foreseen positions on the matrix-holding cylinder (3) ;means for automatically supplying the plurality of plates (1) onto said receiving and inserting means (7);means for reading the identification code of each one of said plates (1) and coupling it with the identification code of the programmed sequence; andmeans for loading each one of said plates (1) onto said matrix-holding cylinder (3) according to the programmed sequence contained in said central control and command unit.
- System according to any one of Claims 20 to 22, characterised in that it further comprises strongly-attracting means (36) placed in said receiving means (7), said strongly-attracting means (36) attracting said plate (1) against said receiving means (7) by overcoming the thrust force provided by the rotation of said matrix-holding cylinder (3), said plate (1) being kept in a fixed and unmoving position on said receiving means (7) by said strongly-attracting means (36) to realise the final unloading of said plate (1) from said cylinder (3).
- System according to any one of Claims 20 to 23, wherein every matrix-holding cylinder (3) is adapted to contain a plurality of matrix printing plates (1) on its external surface, and each of said plates (1) comprises an identification code, characterised in that it further comprises:means for programming a sequence of unloading of plates (1) from the matrix-holding cylinder (3), said programmed sequence being stored in a central control and command unit, said sequence establishing the identification code of the respective plate (1) to be extracted from one of the provided positions on the matrix-holding cylinder (3); andmeans for unloading each one of said plates (1) from said matrix-holding cylinder (3) on said receiving means (7) according to the programmed sequence contained in said central control and command unit.
- System according to any one of Claims 20 to 24, characterised in that said receiving and inserting means (7) are composed of a frame (7) that is extended for the whole longitudinal extension of said matrix-holding cylinder (3), said frame (7) being equipped with holding means (40) of said plates (1) against said frame (7) during their sliding movement on said frame (7), said frame (7) being further equipped with detecting means (42) for the position of said plates (1), said detecting means (42) being adapted to rotatingly control the matrix-holding cylinder (3) in order to phase its position with respect to the advancement of said plates (1) for their phased loading or unloading on or from said cylinder (3).
- System according to Claim 25, characterised in that said holding means (40) are composed of a plurality of magnets (40) and said detecting means (42) are composed of a plurality of sensors (42).
- System according to Claim 25 or 26, characterised in that said frame (7) is further equipped with rotating means (44) whose rolling action facilitates the displacement of said plates (1) on said frame (7).
- System according to any one of Claims 20 to 27, characterised in that said rotating means (44) are composed of a plurality of rubber wheels (44).
- System according to any one of Claims 20 to 28, characterised in that said pushing means (8) are composed of at least one piston (8).
- System according to any one of Claims 20 to 29, characterised in that said pressing means (12) are composed of at least one rubber wheel (12).
- System according to any one of Claims 20 to 30, characterised in that said attracting means (34) are composed of at least one magnet (34).
- System according to any one of Claims 20 to 31, characterised in that said opening means (16, 18, 20, 22, 24, 26) are composed of a first and a second wheel (16, 18) adapted to roll onto the surface of said control means (28), said first and second wheels (16, 18) being respectively integral (through a junction 19) with a third and a fourth wheel (20, 22) adapted to control said mobile hooking means (23), said third and fourth wheels (20,22) being placed at an end of a respective toothed shaft (24, 26), said toothed shafts (24, 26) transferring the movement of the movable hooking means (23) from the wheels (16, 18, 20, 22) to the movable hooking means (23) themselves, said toothed shafts (24, 25) being mechanically connected to the movable hooking means (23).
- System according to any one of Claims 20 to 32, characterised in that said control means (28, 30, 32) are composed of a cam (28) adapted to engage said first and second wheels (16, 18) during a rotation of said matrix-holding cylinder (3) in order to move said first and second wheels (16, 18) in an opening position of said mobile hooking means (23), said cam (28) being adapted to release the engagement of said first and second wheels (16, 18) during a further rotation of said matrix-holding cylinder (3) in order to snap said mobile hooking means (23) in engagement with the rear end of said plate (1), said cam (28) being adapted to assume a rest position, in which said cam (28) does not interfere with the rotation of said matrix-holding cylinder (3) and does not engage said first and second wheels (16, 18), said cam (28) assuming said rest position through the pull of elastic means (30), said cam (28) being adapted to further assume a working position, in which said cam (28) engages said first and/or second wheel (16, 18), said cam (28) assuming said working position through the thrust of piston means (32).
- System according to Claim 33, characterised in that said piston means (32) are adapted to move said cam (28) in three respective working positions, one in engagement with the first wheel (16) only, one in engagement with the second wheel (18) only and one in engagement both with the first wheel (16) and with the second wheel (18), to allow the engagement of three possible combinations of plates (1) on the matrix-holding cylinder (3).
- System according to any one of Claims 20 to 34, characterised in that said strongly-attracting means (36) are composed of at least one electromagnet (36).
- System according to any one of Claims 20 to 35, characterised in that the loading direction (A) has a rotation direction that is opposite with respect to the one of the unloading direction (B).
- System according to any one of Claims 20 to 36, characterised in that every matrix-holding cylinder (3) contains eight matrix printing plates (1) mutually placed side by side on its external surface.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03425001A EP1435292B1 (en) | 2003-01-02 | 2003-01-02 | Process and system for automatically loading and unloading matrix printing plates on cylinders for printing assemblies for flexographic printing machines |
AT03425001T ATE320346T1 (en) | 2003-01-02 | 2003-01-02 | DEVICE AND METHOD FOR AUTOMATICALLY FEEDING AND REMOVING CYLINDER PRINTING PLATES FROM A FLEXOGRAPHIC PRINTING MACHINE |
DE60304024T DE60304024D1 (en) | 2003-01-02 | 2003-01-02 | Apparatus and method for automatically feeding and removing printing plates for cylinders from a flexographic printing machine |
GB0702483A GB2435238A (en) | 2003-01-02 | 2007-02-09 | Inking device for a printing machine, in particular a flexographic printing machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03425001A EP1435292B1 (en) | 2003-01-02 | 2003-01-02 | Process and system for automatically loading and unloading matrix printing plates on cylinders for printing assemblies for flexographic printing machines |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1435292A1 true EP1435292A1 (en) | 2004-07-07 |
EP1435292B1 EP1435292B1 (en) | 2006-03-15 |
Family
ID=32479986
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03425001A Expired - Lifetime EP1435292B1 (en) | 2003-01-02 | 2003-01-02 | Process and system for automatically loading and unloading matrix printing plates on cylinders for printing assemblies for flexographic printing machines |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1435292B1 (en) |
AT (1) | ATE320346T1 (en) |
DE (1) | DE60304024D1 (en) |
GB (1) | GB2435238A (en) |
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Also Published As
Publication number | Publication date |
---|---|
EP1435292B1 (en) | 2006-03-15 |
GB2435238A (en) | 2007-08-22 |
DE60304024D1 (en) | 2006-05-11 |
ATE320346T1 (en) | 2006-04-15 |
GB0702483D0 (en) | 2007-03-21 |
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