ES2547473B1 - Introducing device for the supply of laminar bodies in a graphic printing station - Google Patents

Abstract

Introducing device for the supply of laminar bodies in a graphic printing station, to simultaneously introduce laminar bodies at the same level and in parallel with each other and in continuous, comprising storage areas for laminar bodies where the laminar bodies are arranged in a vertical stack, the storage area being provided with independent travel means for extracting the laminar bodies from the storage area to an external conveyor means linked to the graphic printing station. The displacement means are located on a movable bed with respect to a fixed bed previously arranged to the graphic printing station, said displacement means comprising rotating drive belts driven by motor means, being linked to a vacuum aspiration device; presenting the movable bed front stop means which are in contact with the front of the laminar bodies.

Description

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Introducing device for the supply of laminar bodies in a station of

graphic printing

DESCRIPTION OBJECT OF THE INVENTION

The purpose of the present patent application of the invention is to register an introducing device for the supply of laminar bodies in a graphic printing station that incorporates notable innovations and advantages.

More specifically, the invention proposes the development of an introductory device intended for manipulation, for example, of cardboard plates of different sizes to be subsequently treated in a digital printing station in a continuous manner and with the minimum separation between the plates of cardboard, so productivity increases.

BACKGROUND OF THE INVENTION

In the printing of cardboard sheets or sheet material, the application of flexographic printing technique is well known today. This technique consists essentially of passing the cardboard plate between two rollers, one of which we will call a click holder where the click that has the desired printing pattern adheres. The operation of this technique is that each round of the click-holder roller prints a cardboard plate.

In flexographic printing, the perimeter of the click roller determines the development of the machine, that is, the distance between the beginning of one plate and the beginning of the next plate. This distance must remain constant regardless of the length of the plates. For this, in an installation of cardboard plate manufacturing provided with a flexographic printing station there is an introducing device that coordinates with the speed of rotation of the click-roller, allowing only one plate to be introduced for each turn of the carrier roller -cliche. For this reason, when printing plates of small dimensions, the distance between them is greater than when printing plates of larger dimensions.

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Although flexographic printing obtains acceptable printing results, it is increasingly being extended in the use of digital printing also for the printing of cardboard plates. Digital printing has a number of advantages over flexographic printing, such as the fact that it allows printing plates without limit of the length of the same, a printing group can have the four basic colors unlike flexographic printing where it is It is necessary to use four printing bodies, each with one of the colors. Another advantage also of digital printing is that there is no need for cliches since the change of pattern in the printing is done digitally and therefore instantaneously with the consequent saving of time, fabrication, storage and maintenance as well as the fact of presenting superior print quality. However, the speed of digital printing is still much lower than flexography, therefore, and taking into account the differences between both technologies, a plate introducer adapted to the requirements of digital printing is necessary and at the same time increase Your productivity

DESCRIPTION OF THE INVENTION

The present invention has been developed in order to provide an introducing device that is configured as a novelty within the field of application and resolves the aforementioned drawbacks, also providing other additional advantages that will be apparent from the accompanying description. then

It is therefore an object of the present invention to provide an introducer device.

for the supply of laminar bodies in a graphic printing station, in particular

planned to simultaneously introduce laminar bodies of the same or different size at

same level and in parallel with each other and with the ability to deposit such bodies

laminar one behind the other in a continuous way, with the minimum possible separation, of

so that the leading edge of a laminar body is in contact or practically in

contact with the final edge of the anterior laminar body. Such an introducer is of the type that

It comprises at least one storage area for laminar bodies where bodies

Layers are arranged in a vertical stack, the storage area being provided

of displacement means to extract a laminar body from the zone of

storage to an external conveyor medium linked to the printing station

graph. More particularly, the invention is characterized by the fact that the means of

displacement are located on a movable bench with respect to a fixed bench

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provided prior to the graphic printing station, said displacement means comprising rotating drive belts provided with a plurality of through holes therein and driven by motor means, being linked to a vacuum aspirator device; and in which the fixed bed has trailing rollers or aspirating belts through which the laminar bodies pass. In addition, the movable bed has stop means that are in contact with the front of the sheet bodies.

Thanks to these characteristics, an introducing device is obtained that allows the laminar bodies, regardless of their size (in particular, width and length) to enter the digital printing station continuously having the minimum distance between them so that it is reduced the time in which the heads of the digital printer are inactive, so that the productivity ratio of the digital printing station is increased. The provision of the drag belts with a vacuum vacuum device prevents the plates or laminar bodies from slipping unlike the use of a conventional belt, ensuring the necessary grip of the iron during the acceleration action of the iron itself until the beginning or leading edge of the sheet body (for example, a cardboard sheet) is in contact or very close to the end end or rear edge of the sheet body adjacent thereto before reaching the drive rollers that rotate at the same speed as a Conveyor belt associated with the printing station.

Another advantage is that the distance (or length value) between the stop means and the drive rollers can be varied by having a movable bed that can move away or approach with respect to the fixed bed provided with the rollers of drag, being suitable for long laminar bodies since an increase in the aforementioned distance allows to increase the time available for the front part of a laminar body to reach the back of the anterior laminar body thus decreasing! the acceleration and the forces derived from it.

It is understood herein that the front part of the laminar body refers to the edge or edge located in front taking as reference the direction of advance of the laminar bodies from the introducer device towards the printing station.

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Preferably, the movable bed is movable by means of a rack system linked to a base surface or floor.

In a particularly preferred embodiment, said rack system is based on the use of a motorized cogwheel coupled to the movable bed, said cogwheel gearing on a rack fixed on the base surface or ground, thus being a simple construction system. and low maintenance.

In a preferred embodiment, the introducer device has two storage areas arranged parallel to each other, each of the storage areas being provided with independent travel means. In this way, it is possible to increase the loading or working capacity of the introducer device since two rows of laminar bodies of the same or different size can be printed simultaneously.

Advantageously, each of the displacement means is driven by independent motor means.

Advantageously, the storage area is laterally delimited by axially movable positioners in a transverse direction with respect to the direction of travel of the laminar bodies, which allow the cardboard plates to be positioned correctly on the storage areas.

According to another aspect of the invention, the rotating drive belts are mounted in tanker assemblies that can move in a transverse direction with respect to the direction of travel of the laminar bodies so that they can be placed in the most appropriate position depending on the measurements of the laminar bodies to manipulate. Each of said tank assemblies comprises at least three pulleys arranged in a triangular arrangement, seen laterally, one of them being a driving pulley that transmits the movement to the rotating drive belt.

In a particular embodiment, the drive means consist of a servomotor coupled to a drive shaft that transmits the movement to the rotating drive pulley on which the rotating drive belt is coupled.

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Advantageously, the introducer device may include a detector sensor for the detection of a sliding situation of a laminar body with respect to a rotating drive belt, said detector sensor being located between the stop means which are in contact with the front part of the laminar bodies and the drag rollers, so that said sliding can be corrected by modifying the operating parameters of the motor means. In this way, the distance between laminar bodies can be maintained in a constant and determined way.

Other features and advantages of the introducer device object of the present invention will be apparent from the description of a preferred, but not exclusive, embodiment, which is illustrated by way of non-limiting example in the accompanying drawings, in which:

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1.- It is a schematic view in side elevation of an introducer device according to the present invention;

Figure 2.- It is a schematic top plan view of the introducer device shown in Figure 1; Y

Figure 3.- It is an enlarged schematic view of the area of the movable bed that is part of the introducer device.

DESCRIPTION OF A PREFERRED EMBODIMENT

In view of the aforementioned figures and, according to the numbering adopted, an example of a preferred embodiment of the invention can be observed therein, which comprises the parts and elements that are indicated and described in detail below.

Thus, as shown in the figures, the introducing device is provided for the supply of cardboard sheets to a digital graphic printing station to be printed, for example, with advertising information, indications on the products to be transported in the boxes. , etc.

This introducer device comprises a pair of adjacent storage areas (1)

located on a movable bench (2) and intended to be placed in each of them in a

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stacked a plurality of cardboard sheets (3). Each of the storage areas (1) is provided with means of movement, which will be detailed below, which allow the extraction of the cardboard sheets (3) from each of the storage areas (1) towards a Conveyor belt (4) linked to the digital graphic printing station, indicated in general with reference (5). This description will not go into greater detail in the description of the digital graphic printing station (5) since it can be any of those currently available in the market and is not part of the invention itself.

Each of the storage areas (1) is laterally delimited by positioners (6) that can be moved axially with the aid of guiding means in a transverse direction with respect to the direction of movement of the cardboard plates (3) that It is indicated by arrows (f) in Figure 2, allowing its adjustment to the dimensions of the cardboard sheets.

With particular reference now to the displacement means, these comprise for each of the storage areas (1) of two tanker assemblies, generally indicated by reference (7), which are provided with rotating drive belts (8 ) which include a plurality of through holes (9) therein. Such rotating drive belts (8) are driven by three pulleys (10) that are part of the tanker assembly (7), one of the pulleys being a driving pulley that transmits the movement to the rotating drive belt (8) by the action of a servomotor (11). It will be very evident by one skilled in the art that the number of pulleys (10) can be variable.

Each of the rotating drive belts (8) is linked to a vacuum aspiration device that has a vacuum chamber (12) that aims to prevent the sliding of the cardboard plates (3) with respect to the rotating drive belts ( 8) when they are ejected out of the movable bed (2) by sucking the cardboard plate (3) through the through holes (9) of the rotating drive belts (8).

In addition, the movable bed (2) has front stop means defined by plates that are in contact with the front of the laminar bodies while a fixed bed (13) arranged after the movable bed (in the direction of operation ) has a pair of drive rollers (14) facing each other in a plane

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vertical leaving a space through which the cardboard sheets (3) from the storage areas (1) pass.

Additionally, the movable bed (2) also has rear stop means that are in contact with the back of the cardboard sheets (3), which include a roller (15) supported on a support structure (16) that It comprises an arm that is substantially "L" shaped. Advantageously, the support structure (16) is coupled to a rack system that has a rack plate (17) fixed to the support structure (16) that engages with a cogwheel ( 20) coupled to the movable bed (2) The rack system arrangement allows to regulate the distance between the aforementioned front stop means and the rear stop means Mention that the rollers (15) can be adjusted in height thanks to the arrangement of a secondary rack system (18) arranged in the support structure (16).

As can be seen more clearly in Figure 3, the movable bed (2) can move longitudinally in the direction of advance of the cardboard sheets (3) through a rack system that has a rack (18), coupled in the ground, which meshes with a motorized cogwheel (19) coupled to the movable bed. In order to ensure the positioning of the movable bed (2) on the rack (18), a vertical drive interlocking system is included, generally indicated by reference (21), such that in a blocking position it prevents the involuntary movement of the movable bed (2) on said rack (18).

In addition, a sensor (22) provided for detecting a sliding situation of the cardboard plates (3) with respect to the rotating drive belts (8) is mounted on the movable bed (2) of the introducing device of the present description. ).

To prevent an iron prior to contacting the rotating drive belts (8)

come into contact with such rotating drive belts (8) while it is still sliding

a cardboard plate (3) towards the drive rollers (14), with the consequent

friction between the underside of the cardboard plate (3) to be introduced and the straps

rotating trailers (8), advantageously in the storage area (1),

lifting plates (23) on which the cardboard plates (3) rest on a

condition prior to contacting the means of travel, such plates being

elevators (23) driven by drive means that are detailed more

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ahead. Just at the moment when the back of the plate comes into contact with the drive rollers (14) the lifting plates (23) go to an elevated position with respect to the position of the rotating drive belt (8) with that the rotating drive belt (8) can reduce its speed until it stops completely. At this time the 5 lifting plate (23) descends leaving the cardboard stack again on the rotating drive belts (8) without friction between the cardboard plates to be introduced and the belt.

More particularly, such drive means that allow the lifting and lowering of the lifting plate (23) to be carried out comprise a pair of rotary actuator assemblies, each of which has a rotation axis (24) attached to a cam mechanism (25) that is linked by the upper part of the lifting plate (23), as can be seen more clearly in Figure 3.

The details, shapes, dimensions and other accessory elements used in the manufacture of the introductory device of the invention may be conveniently substituted by others that do not depart from the scope defined by the claims included below.

Claims (15)

5 10 fifteen twenty 25 30 1. Introducing device for the supply of laminar bodies in a graphic printing station, in particular intended to simultaneously introduce laminar bodies of the same or different size at the same level and in parallel with each other and continuously, comprising at least one storage area (1) for laminar bodies where the laminar bodies are arranged in a vertical stack, the storage area being provided with independent displacement means for extracting one or more laminar bodies from the storage area (1) to a conveyor means external linked to the graphic printing station (5), characterized by the fact that the displacement means are located in a movable bed (2) with respect to a fixed bed (13) previously arranged to the graphic printing station (5 ), such displacement means comprising rotating drive belts provided with a plurality of through holes along them and driven by motor means, being linked to a vacuum vacuum device; the movable bed (2) presenting front stop means which are in contact with the front part of the laminar bodies; and in which the fixed bed (13) has drag rollers or aspirating belts through which the laminar bodies pass. 2. An introducer device according to claim 1, characterized in that the movable bed (2) is movable by means of a rack system linked to a base surface or floor. 3. An introducing device according to claim 2, characterized in that the rack system has a motorized gearwheel coupled to the movable bed (2), said gearwheel gearing on a rack fixed on the base surface or floor. 4. An introducer device according to claim 1, characterized in that it has two storage areas (1) arranged in a parallel fashion to each other, each of the storage areas (1) being provided with independent means of movement. 5 10 fifteen twenty 25 30 5. An introducing device according to claim 4, characterized in that each of the displacement means is driven by motor means independent of each other. 6. An introducer device according to claim 1, characterized in that the storage area (1) is laterally delimited by axially movable positioners (6) in a transverse direction with respect to the direction of travel of the laminar bodies. 7. An introducer device according to claim 1, characterized in that each of the rotating drive belts (8) is mounted on a tanker assembly (7) movable in a transverse direction with respect to the direction of movement of the bodies laminar, said tank assembly (7) presenting at least three pulleys (10) arranged in a triangular arrangement, seen laterally, one of them being a driving pulley that transmits the movement to the rotating drive belt (8). 8. An introducer device according to claims 1 and 7, characterized in that the driving means consist of a servo motor coupled to a drive shaft that transmits the movement to the rotating drive pulley on which the rotating drive belt is coupled. 9. An introducer device according to claim 1, characterized in that it comprises a sensor for detecting a sliding situation of a laminar body with respect to a rotating drive belt, said sensor being disposed between the front stop means and the drag rollers. 10. An introducer device according to claim 1, characterized in that the movable bed has rear stop means which are in contact with the back of the laminar bodies. 11. An introducer device according to claim 10, characterized in that the rear stop means include regulation means for regulating the distance between the front stop means and the rear stop means. 12. An introducer device according to claim 11, characterized in that the regulation means consist of a secondary rack system. 13. Introducing device according to claim 1, characterized in that the 5 sheet bodies consist of cardboard sheets (3). 14. An introducer device according to claim 1, characterized in that the storage area (1) includes at least one lifting plate (23) on which the laminar bodies rest in a condition prior to contacting the means of 10 displacement, such a lifting plate (23) being driven by drive means. 15. An introducer device according to claim 14, characterized in that the driving means for raising / lowering the lifting plate (23) comprise at least one rotary actuator assembly having a rotation axis (24) connected to a mechanism of 15 cam (25) linked with said lifting plate (23).