WO2024252054A1 - Laminar substrate feeder and processing machine couplable thereto - Google Patents

Abstract

The invention relates to a laminar substrate feeder for processing machines that comprises: - elements (2) for supplying and guiding at least one stack of laminar substrates (3) with an adjustable height gauge (4) for the passage of a single laminar substrate (3.1) at a time; - a feeding table (5) with suction and with a plurality of wheels (6) integral with at least one axis of rotation for feeding by means of the movement of the laminar substrate (3.1); - and traction means located after the gauge (4) in the direction of movement of the laminar substrate (3.1) to direct the laminar substrate (3.1) to the processing machine, wherein the feeding table (5) is stationary, and it comprises control means configured to selectively stop the rotation of the corresponding axis of rotation.

Description

DESCRIPTION

SHEET SUBSTRATE FEEDER AND PROCESSING MACHINE ATTACHED TO IT

Technical sector

The present invention relates to feeding machines for laminar substrates such as cardboard or corrugated cardboard sheets for feeding to a cardboard processing machine, specifically for a machine for applying preparation products, such as for example the application of varnish or primer for subsequent digital printing.

State of the art

For the processing of cardboard, in particular for the application of decorative or marking motifs by digital printing, it is often necessary to apply a preparation product, varnish or primer prior to printing with ink. This process is carried out by a roller machine for applying preparation products which, by combining different rollers, applies a layer of said preparation product with a certain thickness onto the cardboard surface. Conventionally, these machines, prior to the cardboard entering the application roller, comprise a vacuum table with wheels to direct the cardboard to the entry of the application rollers in an appropriate manner.

For process automation, these machines are combined with a cardboard feeder, which is designed to hold a stack of cardboard sheets and feeds them separately towards the preparation machine. This cardboard feeder is fixedly located at a location and the preparation product application machine is coupled to it.

The feeder consists of a hopper or adjustable area for supplying the stacked cardboard, comprising an adjustable gauge that leaves a passage space corresponding to the thickness of the cardboard sheet. At the bottom of said hopper there is a table with a plurality of wheels for moving/feeding the cardboard. each cardboard sheet. In order to have better traction, said feeding table comprises a suction table that sucks the cardboard sheet helping said wheels to better traction said cardboard sheet. Furthermore, at the exit of the gauge passage gap, the feeder comprises a lower feeding roller and a corresponding pressing roller on it to move the cardboard sheet to the feed inlet of the preparation machine.

In one operating cycle of this feeder, the vacuum table sucks a cardboard sheet, and by transmission of the rotation of the wheels said cardboard sheet moves in the direction of the preparation or processing machine at a speed according to the needs of the preparation machine. When the cardboard sheet exits the passage gap of the gauge and its front flank reaches the feed roller and its clamping roller, the suction table is raised so that the wheels are no longer in contact with the cardboard sheet (the wheels are fixed and the upper plate of the table rises so that the horizontal line of tangency to the upper part of the wheels is below the upper level of the plate of the table to avoid contact), the wheels being driven by a single motor. However, the suction continues to exist so that the outgoing cardboard sheet and the cardboard sheet immediately above it ready to exit, are sucked against the suction table, being a static element that produces retention of the cardboard sheet.

The outgoing cardboard sheet has sufficient traction to exit, due to the traction provided by the traction rollers, despite the retention caused by the raised suction table. In turn, the next cardboard sheet as it comes into contact with the raised suction table is retained, preventing the outgoing cardboard sheet from dragging it. Thus, when the back edge of the cardboard sheet reaches the gauge exit gap, being released from the cardboard package, the suction table lowers to its initial position where the wheels come into contact again with the next cardboard sheet to be extracted, starting the cycle again.

However, this implementation poses various problems that result in defects in the cardboard sheets and lower productivity.

One of the problems that arise is the friction of the cardboard sheet with the suction table in its raised position, which makes it necessary to make extra energy efforts, or a greater tread of the tamper roller to achieve sufficient traction.

The need for the pressing roller to be able to split the cardboard sheet when the wheels are no longer in contact with the cardboard sheet when raising the suction table causes certain cardboard sheets to be marked due to the pressing roller's impact, making them unsuitable for later use.

Another problem that arises due to the raising and lowering of the suction table is the damage caused to the perimeter ends by tears, breaks, bending, etc., caused by the guiding and retention elements of the cardboard package supply area. In addition, the same movement of raising and lowering the suction table causes friction with the output gauge, once again causing jams or damage that invalidate the cardboard sheet.

An additional problem arises from the minimum length of cardboard sheet that must be fed in a given production process. During operation of the feeder, in order for the cardboard sheet to have enough time to come out of the gauge and be able to be broken up by the feed roller and its depressor roller before the suction table has been raised and the traction of its wheels is lost due to the rear side of the cardboard sheet overhanging the first wheel axle and preventing the wheels from feeding the next cardboard sheet prematurely, a minimum length must be left between the rear of the cardboard and the first wheel axle. This limitation leads to very short suction tables which would not have sufficient traction force for longer cardboard sheets that might be present in other production batches.

In the US Patent document US20220063938A1, one of the problems mentioned above is attempted to be solved. Thus, in order to eliminate the pressing roller and avoid damaging the cardboard sheet, document US20220063938A1 discloses a feeder with a suction table and its corresponding wheels at the gauge output, achieving the necessary traction to feed the machine in this case for processing cardboard to make boxes. This alternative solves the aforementioned problem of the pressing roller, however, with the movement of the suction table, friction will continue to occur on the perimeters of the cardboard sheet.

Another problem that arises in the feeder is in cases where it includes Two or more cardboard stacks to be fed in parallel lines. In these cases, it is necessary to provide an intermediate separator so that each cardboard sheet is correctly positioned in its line of movement. Since the suction feeding table moves, the separator cannot be supported as this would prevent the free movement of the suction table, leaving a space between the separator and the feeding table. This situation causes the substrate being fed to not be guided on the separator side at the moment when the feeding table is down, so that jams or misalignments of the substrate may occur during its feeding movement.

In view of the disadvantages or limitations of the current solutions described above, a solution is needed that prevents damage to the cardboard sheets, while providing faster movement of the cardboard sheets for feeding to a processing machine and smoother movements that will prevent misalignments.

Object of the invention

In order to meet this objective and solve the technical problems discussed so far, as well as providing additional advantages that may be derived later, the present invention provides a feeder for laminar substrates for processing machines comprising:

- supply and guiding elements for at least one stack of laminar substrates with a height-adjustable gauge for the passage of a single laminar substrate at a time,

- a feeding table with suction and with a plurality of displacement wheels arranged integral with at least one axis of rotation for feeding by means of the displacement of the laminar substrate,

- and traction means located after the gauge in the direction of movement of the laminar substrate to direct the laminar substrate to the processing machine, where the feed table is fixed, and comprises control means configured to selectively stop the rotation of the corresponding rotation axis.

With this configuration it is possible to keep the feeding table fixed, that is, immobile to receive the laminar substrates on it, and stop the rotation axis whose wheels can interact with the next substrate ahead of time, understood as the axis of corresponding rotation, the rotation axis driven independently or part of a group of axes, with a single independent drive, which will be selectively stopped according to the requirements of the substrate feed.

The axis of rotation of the invention is understood to be the axes that have the function of dragging the substrate, and there may be additional axes, for example, in order to distribute the support of the load, but in this case without the extra function of dragging, said additional axes therefore not being included in the definition of axis of rotation according to the invention. Although they could also form part of a practical alternative of the invention.

Thanks to this arrangement, it is possible to keep the suction table fixed without having to raise it to avoid the traction of the wheels, as occurs in the state of the art. Consequently, the stack of substrates does not move, thus avoiding damage to the perimeter ends of said substrates caused by their friction with the guiding and retention elements of the supply and feeding area of the stack of laminar substrates. The supply area is understood to be a hopper, or a space delimited by adjustable walls depending on the dimensions of the laminar substrate.

Another of the problems present in the state of the art that is solved with the invention is that friction with the suction table is avoided when it is in an elevated position. In the present invention, the protruding substrate is always in contact with the drive wheels until it exits the passage gauge, which reduces energy efforts.

Additionally, maintaining the traction by the wheels makes it possible to move the substrate at the required speed without the need to use a pressing roller, or by reducing the pressing pressure of said roller. The traction of the feed roller located at the outlet will be sufficient, added to the traction provided by the wheels that maintain contact with the laminar substrate, which, in addition, since there is no friction with the suction table as in the state of the art, provides greater traction than in known solutions. In this way, the laminar substrate is prevented from being marked by the pressing of the roller and having to be discarded.

Preferably the control means of the laminar substrate feeder object of the invention are configured to stop the corresponding axis of rotation before the next sheet substrate being fed contacts the wheels on said axle.

Preferably, the feeder for laminar substrates object of the invention comprises a plurality of rotating axes with their corresponding wheels, comprising drive means for each axis and/or group of rotating axes, and the control means being configured to stop the drive means corresponding to the axis or group of axes to be stopped before the next laminar substrate being fed contacts the feed wheels of the corresponding rotating axis.

That is, the rotation axis will be stopped, whether it is driven independently or is part of a group of axes with the same drive that needs to be stopped, before it contacts the next substrate to be fed, to avoid moving the next substrate before it is due.

The moment at which the next substrate being fed might touch the wheels on a given axis would mark the limiting moment for stopping the rotation of said axis of rotation, the stopping moment being determined by the control means. The stopping moment at which said next substrate would touch the wheels being dependent on the distance between the axles, stiffness of the substrate, dimensions of the substrate, weight of the stack of substrates, density of the substrate material, etc.

This stopped shaft will stop providing traction, preventing the next substrate from being dragged and causing jams. The shafts and their corresponding wheels will preferably stop successively as the laminar substrate passes through the feed gauge, with all the shafts then being activated again for a new feeding cycle of the laminar substrate.

Another advantage of the present invention is that it is no longer necessary to leave a minimum length of the substrate before its rear flank meets the first wheel axle during extraction so that it can be divided by the feed roller as in the state of the art. With this solution, it will be possible to have a suction table as long as necessary.

According to a characteristic of the invention, the wheels attached to the axis of rotation are configured to have free movement in case their axis of rotation is stopped.

In this way, the wheels will turn at the same time as the turning axis, but in the case where a turning axis is stopped with a laminar substrate being fed, they will have freedom of rotation to prevent the laminar substrate being fed from being rubbed by the wheels due to the stopping of the turning axis. This configuration is especially interesting when there are groups of axes driven by the same drive, so that when the drive is stopped all the axes are stopped, or if for safety reasons it is desired to stop one of the turning axes in the feed before it has passed the rear flank of the substrate, or for example in the case where the substrate has already gained traction with the traction means located after the gauge.

According to a characteristic of the invention, at least one axis of rotation can rotate in the opposite direction to that corresponding to the movement of the laminar substrate, providing traction to the wheels in the opposite direction, being useful in case of needing to reposition a laminar substrate that for any reason had been dragged when it was not the right time.

According to another feature of the invention, the feeding table comprises means for lateral movement of the laminar substrate. The supply and guiding elements of the laminar substrate feeder comprise a lateral guide or stop for the laminar substrate, however, to avoid jams, a clearance is left with respect to said guide preferably of about 0.5 mm on each side. Thus, sometimes it may happen that the substrates are rotated with respect to their feeding direction due to said clearance. Therefore, thanks to this configuration of the table with means for lateral movement of the laminar substrate, it is possible to avoid misalignment of the laminar substrate, for example, by moving the substrate towards its left lateral guide to be fed referenced to said left guide.

These means of lateral movement of the substrate may be in the form of an engraving on the table which causes the substrates to tend to move laterally as they advance towards the feed, or at least a wheel configured to laterally move the substrate towards the corresponding lateral guide, which may be, for example, inclined axes, or wheels intercalated with the axes of the feed wheels. In this last case, the wheels could be hidden, for example, according to a pneumatic mechanism, hiding themselves when the substrate has already been brought against the side guide. In the case of inclined axes, it is contemplated that after the substrate has been brought against the guide and its wheels are exposed, the inclined turning axes are stopped, keeping their wheels free to turn in the direction of advance, with the feeding carried out by the aforementioned feed turning axes.

Thanks to this configuration, the alignment of the substrate can be corrected, being linked to the characteristic that the feeding table is fixed, which would not be possible in the known state of the art.

Preferably, the traction means at the gauge exit are at least one feed roller, or one feed roller with its corresponding pressing roller.

Even more preferably, the traction means at the exit of the gauge are a secondary feeding table with suction and with displacement wheels with independently driven axles and/or axles driven jointly by a single or several drives. This configuration is possible thanks to the maintenance of traction by the wheels of the feeding table that maintain contact with the exiting substrate. The combination of a secondary suction table at the exit of the gauge, together with a feeding roller, is also contemplated, depending on the speed requirements requested by the processing machine.

Preferably the drive means are servomotors, which facilitate greater control of the acceleration and braking of the wheels.

According to a feature of the invention, the feeding table comprises at least two suction zones, the control means being configured to activate/deactivate said suction zones selectively. This configuration of a segmented suction table is an interesting implementation option for a feeding table of a suitable length for large-sized laminar substrates, so that each suction zone can be activated or deactivated according to the lengths of the substrates being fed at any given time.

According to a feature of the invention, the laminar substrate feeder comprises a separator fixable on the feeding table for separation and alignment of substrates. laminar substrates when fed in parallel. Since the suction table is fixed, a movable separator design is not necessary as in the state of the art, thus reducing the difficulty and costs of manufacturing, and being a more reliable implementation without mechanical elements susceptible to failure. This feature in combination with the means of lateral movement of the laminar substrate mentioned above allow the substrate to be brought against the separator so that it acts as a reference, which was not possible in the state of the art due to having a space between the separator and the feeding table for raising the table itself.

According to another feature of the invention, the laminar substrate feeder comprises movement means for its movement to another location, preferably wheels that allow its movement in the direction of movement of the substrate in its feed, to connect it to the corresponding processing machine, or to carry out maintenance tasks.

According to another aspect, the invention also relates to a machine for processing laminar substrates, preferably a machine for applying preparation products, with means for moving in the direction of movement of the laminar substrate, and connectable to the feed inlet of the processing machine, in this case to the preparation product application rollers, the substrate feeder comprising a secondary suction table at the exit of the gauge that provides the traction necessary for feeding the substrate to the processing machine. It should be mentioned that conventionally this type of processing machines comprise a feed table with suction and with wheels at the inlet for feeding and accelerating the laminar substrate coming from the laminar substrate feeder, however, with this configuration it is possible to dispense with the feed table in the preparation product application machine, being able to couple it to the laminar substrate feeder. Thanks to this configuration, maintenance tasks are facilitated, especially for cleaning, providing better access to the dosing and preparation product application rollers of the processing machine. In addition, continuity is provided for the transport of the laminar substrates.

Description of the figures

Figure 1 shows a schematic elevation view of a substrate feeder. laminar according to the state of the art before the laminar substrate begins its displacement.

Figure 2 shows a schematic elevation view of a state-of-the-art sheet substrate feeder with the black arrow indicating the elevation of the suction table.

Figure 3 shows a schematic elevation view of a feeder for laminar substrates according to the state of the art with the black arrow indicating the descent of the suction table.

Figure 4 shows a schematic elevation view of a preferred embodiment of a laminar substrate feeder according to the object of the invention before the laminar substrate begins its movement.

Figure 5 shows a schematic elevation view of a preferred embodiment of a sheet substrate feeder according to Figure 4 at the moment when the rear flank of the sheet substrate has passed the first wheel axle.

Figure 6 shows a schematic elevation view of a preferred embodiment of a sheet substrate feeder according to Figure 4 at the moment when the rear flank of the sheet substrate has passed the second wheel axle.

Figure 7 shows a schematic elevation view of a preferred embodiment of a sheet substrate feeder according to Figure 4 at the moment when the rear flank of the sheet substrate has reached the last wheel axis.

Figure 8 shows a schematic elevation view of a preferred embodiment of a sheet substrate feeder according to Figure 4 at the moment the sheet substrate has left the passage gauge.

Figure 9 shows a schematic perspective/top view of an alternative embodiment of the sheet substrate feeder with two feed lines.

Figure 10 shows a schematic elevation view of an alternative embodiment of the invention with a longer suction table.

Figure 11 shows a schematic elevation view of a feeder for laminar substrates coupled to a machine for applying preparation products, according to the state of the art.

Figure 12 shows a schematic elevation view of a preferred embodiment of a sheet substrate feeder coupled to a product application machine in accordance with the object of the invention.

Detailed description of the invention

In view of the aforementioned figures, and in accordance with the numbering adopted, one can observe in them a preferred embodiment of the invention, which comprises the parts and elements that are indicated and described in detail below.

According to figures 1 to 3, an exemplary embodiment according to the state of the art can be observed. As can be seen in figure 1, the length L2 from the gauge (4') of passage until the cardboard sheet (3.1') is stepped on by a pressing roller (10') has to be less than the length L1 from the flank or rear edge of the cardboard sheet (3.T) to the vertical axis of the first wheels (6') that said edge of the cardboard sheet (3.1') would encounter in its motion, with the objective that no wheel (6') remains in contact with the next cardboard sheet to be fed. Since it is necessary to comply with this relationship between the lengths L1 and L2, for shorter substrates such as a cardboard sheet (3.1') of approximately 600mm in length, the feeding table (5') would be limited in length resulting in a feeding table (5') that would not be valid for cardboard sheets (3.1') of great length.

Furthermore, to prevent the next cardboard sheet from coming into contact with the wheels (6’) when the outgoing cardboard sheet (3.1’) is being fed, as can be seen in figure 2, a feeding table (5’) is raised, so that when said feeding table (5’) is raised, as the wheels (6’) are fixed, they do not come into contact with the next cardboard sheet (3’).

Once the back edge of the cardboard sheet (3.1') has passed through the gauge (4') and is divided by the pressing roller (10') and the feeding roller (8'), as can be seen in figure 3, the suction table (5') lowers to its initial position allowing the next cardboard sheet to lower and contact the wheels (6') for its movement.

As indicated, this movement of the suction table (5') generates friction on the cardboard sheets (3.1'), and when the suction table (5') is in the raised position the cardboard sheet (3.T) is slowed down by the friction with said suction table (5'), so greater traction is necessary with the feed roller (8') which requires the pressure exerted by the press roller (10') to be greater, and consequently marks and defects are produced on the cardboard sheets (3.T) which force them to be discarded.

To solve these problems that arise in the state of the art, looking at Figures 4 to 8, a cycle of the feeding process of an example of a practical embodiment of a feeder of laminar substrates (1) according to the invention can be visualized, the laminar substrate preferably being a cardboard sheet (3.1).

In figure 4 you can see how the cardboard sheet (3.1) of the stack of cardboard (3), due to the weight it has on top due to the stack of cardboard (3), contacts the feeding table (5) with suction and the corresponding wheels (6) that rotate to apply the necessary acceleration for feeding the cardboard sheet (3.1) to a processing machine.

The novelty of the invention is presented at the instant of the cycle represented in figure 5, in this case the suction table (5) is fixed, and to prevent the next cardboard sheet from being dragged ahead of time, once the rear edge of the cardboard sheet (3.1) has reached the vertical of the axis of the first wheels (6), so that said axis stops when passing the vertical and before the next cardboard sheet contacts the wheels (6). The rest of the wheel axles (6) will continue moving providing traction to the cardboard sheet (3.1).

To carry out said stop of the axis, the invention preferably comprises an independent drive for each wheel axle (6), preferably said drive being a servomotor, so that the cardboard feeder (1) comprises control means that give the stop signal to the servomotor that drives the first wheel axle (6). The moment when the rear edge of the cardboard sheet (3.1) has reached the first axle of the wheels (6) will be calculated by the control means, for example, by reading times at the exit of the rollers (8, 10) where readings are made of the front and rear edges of the cardboard sheets (3.1) to check that the feeding is being carried out correctly.

Thus, the control means, based on these readings and the dimensions of the cardboard sheet (3.1) and the feed speeds, etc., calculate when the rear edge of the cardboard sheet (3.1) will reach the axle of the wheels (6), and with this information it will send the stop signal to the servo motor.

As can be seen in figure 6, when the rear edge of the cardboard sheet (3.1) reaches the second axle of the wheels (6), the second servomotor will stop in the same way as the first, leaving the third axle of the wheels (6) in motion. With this configuration, the next cardboard sheet will rest on the fixed feeding table (5) with suction, but will not be dragged as it has no traction, and the protruding cardboard sheet (3.1) will have sufficient traction so as not to need a pressing roller (10) or so that the pressure exerted by said pressing roller (10) is minimal and does not produce defects in the cardboard sheets (3.1).

In relation to figure 7, once the rear flank of the cardboard sheet (3.1) has passed through the last wheel axle (6), the last axle and its corresponding wheels (6) will stop, the cardboard sheet (3.1) being fed towards the processing machine with sufficient traction provided by the roller (8) and/or its pressing roller (10).

Once the cycle is finished, after the rear edge of the substrate has cleared the stack of cardboard in its advance, all wheel axles (6) will be actuated by the servomotors to provide traction to the next cardboard sheet and start a new cycle.

According to an alternative embodiment, in figure 9 a cardboard feeder arrangement (1) with two feeding lines can be seen, comprising a separator (9) fixed to the feeding table (5) that separates and guides both cardboard sheets (3.1). In this case, the adaptation to the different dimensions of the cardboard sheets will be carried out by means of retention and guidance of the storage area of the stack of cardboards (3), said separator (9) remaining fixed at all times on the feeding table (5). Feeding (5). This arrangement facilitates manufacturing and avoids errors and failures that can occur in solutions known in the state of the art that comprise a gap between the feeding table and the separator to allow the feeding table to rise.

In figure 10 you can see an example of an embodiment in which, thanks to the advantages provided by the invention, specifically the greater traction provided by the wheels (6) that maintain the movement of the cardboard sheet (3.1) until it exits through the gauge (4), it is possible to use cardboard sheets (3.1) of greater length, even for example up to 5000mm. For this purpose, a longer suction table (5) will be necessary to have more wheels (6) to provide greater traction.

In this case, in order to adapt to the different lengths, it is contemplated that the suction table (5) is segmented, so that there are several suction zones (5.1). Depending on the length of the stack of cardboard (3), the control means will close the suction of the suction zones (5.1) that are outside the length of the stack of cardboard (3) and the axles of the corresponding wheels (6) will remain motionless. This creates a versatile cardboard feeder (1) adapted to different cardboard lengths (3.1).

According to another aspect of the invention, a cardboard processing machine that can be coupled to the cardboard feeder (1) and the assembly formed by both machines is also contemplated. The processing machine is preferably, for the practical implementation shown in the figures, a preparation product application machine (11).

Starting from the state of the art shown in figure 11, it can be seen how conventionally the cardboard feeder (T) is arranged in a fixed manner in a production line, while the preparation product application machine (11') is movable in the direction perpendicular to the sheet.

For this embodiment of the state of the art, the preparation product application machine (11') comprises a suction table (11.1) for feeding the cardboard sheet (3.1) to provide the necessary speed to said cardboard sheet (3.1) at the entrance of the application rollers (13'). With this solution, for maintenance work, the machine (11') is decoupled from the cardboard feeder (1'), however, for cleaning the dosing roller (12') and the application rollers (13'), access is difficult due to the presence of the suction table (11.1) for feeding which prevents the machine from being opened. easy access to these rollers for cleaning, resulting in long maintenance stops that significantly reduce production.

This problem is solved in the invention, for an embodiment in which the cardboard feeder (1) comprises a secondary suction table (7) with its corresponding wheels (7.1) at the exit of the gauge (4). With this configuration, the appropriate speed is provided to the cardboard sheet (3.1) according to the requirements of the application rollers (13) of the preparation product application machine (11), and as it is not necessary to include the feed roller (8) and its corresponding pressing roller (10) due to the traction provided by the secondary suction table (7), in this case the cardboard feeder (1) can be directly coupled to a preparation product application machine (11) without a feed suction table (11.1).

As can be seen in figure 12, both the cardboard feeder (1) and the preparation product application machine (11) have means of movement in the direction of movement of the cardboard sheet (3.1), so that they are directly coupled, providing continuity in the movement of the cardboard sheet.

(3.1) from the stack of cardboard (3) to the application roller (13) of the preparation product application machine (11).

According to an alternative embodiment, as can be seen in Figure 13, the feeding table (5) comprises means for lateral movement of the cardboard sheet.

(3.1), in this case rotating axes with wheels (6) inclined with respect to the perpendicular to the direction of movement of the cardboard sheet (3.1), so that the cardboard sheet (3.1) moves towards the lateral guide of the supply and guidance area (2) or towards the separator (5), to take it as a reference in the feeding of the cardboard sheet (3.1) to the processing machine.

All the distinctive features of the invention mentioned above provide greater productivity by achieving higher feeding speeds of the cardboard sheet, by not producing defects resulting from friction, pressing down of the pressing roller, and by not producing jams. Also providing greater smoothness of movements that will avoid misalignments, etc.

Claims

1.- Feeder of laminar substrates for processing machines comprising: - supply and guiding elements (2) of at least one stack of laminar substrates (3) with a gauge (4) of adjustable height for the passage of a single laminar substrate (3.1) at a time, - a feeding table (5) with suction and with a plurality of wheels (6) arranged integrally with at least one axis of rotation for feeding by means of the displacement of the laminar substrate (3.1), - and traction means located after the gauge (4) in the direction of movement of the laminar substrate (3.1) to direct the laminar substrate (3.1) to the processing machine, characterized in that the feed table (5) is fixed, and comprises control means configured to selectively stop the rotation of the corresponding rotation axis. 2.- Laminar substrate feeder (1) according to claim 1, wherein the control means are configured to stop the corresponding rotation axis before the next laminar substrate (3.1) being fed contacts the wheels (6) of said axis. 3.- Laminar substrate feeder (1) according to claims 1 or 2, comprising a plurality of rotating axes with their corresponding wheels (6), comprising drive means for each axis and/or group of rotating axes, the control means being configured to stop the drive means corresponding to the axis or group of rotating axes to be stopped before the next laminar substrate (3.1) being fed contacts the wheels (6) of the corresponding rotating axis. 4.- Laminar substrate feeder (1) according to any one of the preceding claims, wherein the wheels (6) are configured to have free movement in case their axis of rotation stops. 5.- Laminar substrate feeder (1) according to any one of the preceding claims, wherein at least one rotation axis can rotate in the opposite direction to the movement of the cardboard sheet. 6.- Laminar substrate feeder (1) according to any one of the preceding claims, wherein the feeding table (5) comprises means for lateral movement of the laminar substrate (3.1). 7.- Laminar substrate feeder (1) according to the preceding claim, wherein the means for lateral movement of the laminar substrate (3.1) are at least one wheel (14) configured to laterally move the laminar substrate (1) towards the lateral guide of the supplying and guiding elements (2). 8.- Laminar substrate feeder (1) according to any one of the preceding claims, wherein the traction means are at least one feed roller (8). 9.- Laminar substrate feeder (1) according to any one of claims 1 to 7, wherein the traction means are a secondary feeding table (7) with suction and with displacement wheels (7.1) with independently driven axes and/or axes driven jointly by a single drive. 10.- Laminar substrate feeder (1) according to any one of the preceding claims, wherein the drive means are servomotors. 11.- Laminar substrate feeder according to any one of the preceding claims, wherein the feeding table (5) comprises at least two suction zones (5.1), the control means being configured to activate/deactivate said suction zones (5.1) selectively. 12.- Laminar substrate feeder according to any one of the preceding claims comprising a separator (9) fixable on the feeding table (5) for separating laminar substrates (3.1) when they are fed in parallel. 13.- Feeder of laminar substrates according to any one of the preceding claims comprising movement means for moving it to another location. 14.- Processing machine with means for moving the machine, and connecting it at its feed inlet to a cardboard feeder (1) according to any one of claims 7 to 13.