EP1749773B1 - Transport system for a metal sheet printing machine or a metal sheet painting machine - Google Patents

Description

The invention relates to a transport system of a plate press or Blechlackiermaschine, with at least one moving leading edge stop for the installation of the leading edge of a transported metal sheet, with a Seitenausrichteinrichtung for sheet metal side orientation, with a feed drum, which has at least one application mark for the system of the leading edge of the metal sheet, and with a multi-belt belt transport system for aligning the leading edge of the panel with the registration mark, wherein the belt transport system is associated with a retaining means for pressing the metal panel against the belts.

A belt transport system of the type mentioned is known. A transported metal sheet is applied with its front edge for pre-alignment to moving leading edge stops. In this pre-directed position, the metal sheet reaches in the course of further transport into the area of a feed drum, which has at least one application mark. By applying the front edge of the metal sheet to the application mark is a fine alignment, so that a so-oriented metal sheet can then be further processed positionally accurate in a printing unit of the sheet metal printing machine or a coating unit of sheet metal. In order to effect a secure application of the metal sheet to the application mark of the feed drum, a belt-containing belt transport system is provided with a holding means, the Metal sheet with its front edge against the registration mark urges. The holding means serves to push the metal sheet as defined as possible with its leading edge to the application mark. In order to align the transported metal sheet transverse to its direction of movement, a Seitenausrichteinrichtung is provided. Since the page orientation is not yet complete or occurs only when the holding means unfolds its holding action between the belt transport system and the metal sheet, the belts of the belt transport system along with the metal sheet due to Seitenausricht-displacements mitverlagert side. The accuracy of the feed and the reproducibility of the orientation of the metal sheets, is in the known transport system still in need of improvement.

From the WO 03/066490 A2 goes out a belt transport system, are supplied to the sheet plates for aligning a feed drum. On the type of belt used, this literature is not one.

The invention is therefore an object of the invention to provide a transport system of the type mentioned, which causes a highly accurate and reproducible sheet feeder in a metal stamping machine or a Blechlackiermaschine.

This object is achieved in that the belts of the belt transport system are formed as a flat belt. Compared with the toothed belt used in the prior art, flat belts have a much lower belt thickness, with the result that such a flat belt does not shear, tilt or warp in a lateral displacement and consequently, even with a lateral deflection of a precise sheet feeding the application mark ensures the feed drum. The fact that even a laterally deflected flat belt does not tilt its transport surface or changes in height, a precise transport is also possible for a following at a short distance follower board. In particular, it is provided that the holding means is activated shortly before the alignment of the metal sheet at the application mark. If the metal sheet fed to the printing device or the leaking device, the laterally deflected belt can zurückbevor in their undeflected position the following table follows. The follow-up board therefore finds laterally undistorted belts. The flat belt also has the advantage that it is not subject to the polygon effect, that is, it runs at a completely constant speed and not with fluctuating speed, which is caused by the teeth of the known toothed belt. Preferably, the holding force of the holding means can be selected to be large, that is, for example, be selectable / presettable for very thin metal sheets than for thicker metal sheets.

According to a development of the invention it is provided that the belt transport system is designed as Riementrum. It is therefore an endless belt system whose belts are preferably guided by deflection wheels. The individual belts are preferably parallel to each other at a distance from each other, so that the metal sheets are sufficiently supported over their width for safe transport. At least two straps must be present to adequately support the metal sheets. Preferably, more than two belts are parallel to each other.

In particular, it is provided that the flat belts of the belt transport system are guided over belt side guides having deflecting wheels. The belt side guides of the pulleys ensure that the flat belts reproducibly assume a laterally defined position, that is, when they are not deflected by lateral forces, they assume a neutral position defined. Illegal game that causes a laterally oscillating displacement of the belt is avoided by the belt side guides. Additionally or alternatively, spherical deflection wheels may be provided to hold the flat belts in the lane.

According to a development of the invention it is provided that the holding means is a vacuum device. Accordingly, the pressing of the metal sheet to the belts is effected by means of the pressure difference existing between the negative pressure and the ambient pressure.

Additionally or alternatively it can be provided that the holding means is a magnetic device. Such an arrangement can be realized in connection with ferromagnetic metal sheets.

Additionally or alternatively it can be provided that the holding means is at least one pressing on the metal sheet friction roller. For example, the friction roller acts on the top of the panel while resting on the bottom of the belt transport system. The pressing of the metal sheet on the belt transport system is effected by a corresponding position of the friction roller, which is for example mounted resiliently, so that the spring force acts as a compressive force on the metal sheet.

In particular, it can be provided that the friction roller is guided axially displaceable. If a metal sheet is laterally displaced by means of the lateral alignment device together with the belts of the belt transport system, then this displacement movement can be accompanied by the friction roller, since it is displaceably mounted in the axial direction. In particular, an elastic bearing can be made such that a non-acted friction roller moves back by a restoring force, such as a spring force in a neutral axial position.

According to a development of the invention, it is provided that the holding function of the holding means can be switched on and off. In the case of a vacuum device, the vacuum can be switched on and off. is the holding means is designed as a magnetic device, so an electromagnet is preferably used, which can be switched on and off. In the case of the formation of the holding means as a friction roller, this is arranged to be displaceable, so that it moves in the direction of the metal sheet and can also be moved away from the metal sheet again. In the salaried position, the friction roller bears with its lateral surface against the surface of the metal sheet with contact pressure; In the parked position, friction roller and metal sheet do not touch each other.

The flat belt has in particular a belt thickness of 0.5 to 3 mm, preferably about 1.5 mm. Opposite the belt width is a small to very small belt thickness, that is, the ratio belt width to belt thickness is a multiple of 1. The belt width can be in particular 10 to 80 mm, preferably 20 to 40 mm. The cross section represents in particular a rectangle, in particular an elongated rectangle. The flat belt is preferably made of homogeneous material, so that it is deflected evenly laterally in a side deflection. Furthermore, it preferably consists of elastic material, so that it deflects when a force is applied and returns to its original position when the force is lost.

In particular, it is provided that the application mark is designed as a clamping application mark. This means that after application of the leading edge of the metal sheet, the registration mark closes, so that the leading edge region of the metal sheet is clamped.

The Seitenausrichteinrichtung is preferably formed as the metal sheet laterally centering device. This means that - regardless of the width format of the metal sheet - their pointing in the direction of transport center line is always aligned centrally to the transport system.

In particular, it can be provided that the side alignment device has at least two side guides, in particular side rollers, receiving the metal sheet between them. The side guides are preferably spring-mounted, so that they can transmit corresponding alignment forces on the side edges of the metal sheet. It is also possible for one side guide to be stationary and the other to be movable, in particular spring-loaded. If a fixed width format is specified or at least exists for a print job, the two side guides can also be arranged fixedly at a defined distance from one another. In particular, an adjusting device is provided so that at least one of the side guides can be adjusted to a desired position and then fixed in this position.

A further development provides for a clamping application mark of the application drum before reaching the top dead center in the clamping state spending control device. Consequently, the clamp registration mark closes on the feed drum before reaching top dead center. This closed position is preferably taken very "early" -based on the top dead center position, since the closure is preferably 0 to 20 °, in particular 8 to 16 ° before top dead center.

Furthermore, it is advantageous if the leading edge stop is arranged on a belt rim. It is therefore moved by means of the belt and serves to advance the metal sheet fed to the application mark the feed drum.

Finally, it is advantageous if the belt transport system is associated with a suction zone, magnetic zone and / or Friktionsrollenandrückzone applied to a resting with its front edge on the landing sheet metal plate approximately in the region of its front quarter to the rear quarter of its longitudinal extent with a holding force. The holding force can therefore extend over the entire area, ie from the front quarter to the rear quarter or it is possible that it is in this area, so applying a holding effect only in a narrow zone or over several narrow zones, this zone or zones however, within the said range lies / lie, namely in the area of the front quarter to the rear quarter of the longitudinal extent of the metal sheet.

Figur 1

eine schematische Seitenansicht auf ein Transportsystem einer Blechdruckmaschine oder Blechlackiermaschine,

Figur 2

eine Draufsicht auf die Anordnung der Figur 1,

Figur 3

eine schematische Seitenansicht eines weiteren Ausführungsbeispiels eines Transportsystems,

Figur 4

eine Detailansicht der Anordnung der Figur 3 und

Figur 5

ein Querschnitt durch einen Flachriemen eines Riementransportsystems des Transportsystems.

The drawings illustrate the invention with reference to an embodiment, in which:

FIG. 1

a schematic side view of a transport system of a sheet metal printing machine or sheet metal painting machine,

FIG. 2

a plan view of the arrangement of FIG. 1 .

FIG. 3

a schematic side view of another embodiment of a transport system,

FIG. 4

a detailed view of the arrangement of FIG. 3 and

FIG. 5

a cross section through a flat belt of a belt transport system of the transport system.

The FIG. 1 shows a transport system 1 for the supply of metal sheets 2 ( FIG. 2 ) on a sheet metal or sheet metal painting machine. The sheet metal plates 2 to be supplied are taken from a stack by means of an investor, not shown, and fed by the transport system of the sheet metal printing machine or sheet metal painting machine in a defined position.

The supply from the stack to the transport system with one of the FIG. 1 not emerging Trum such that the supplied metal sheet 2 is guided with its front edge 3 against a leading edge stop 4. The leading edge stop 4 is located on a belt rim 5, wherein the belt core 5 has a plurality of mutually parallel transport belt 6, which are guided at one end to deflection wheels 7 and 8 and the other end to guide wheels 9. The upper strand 10 of the belt hub 5 is associated with a belt transport system 11, wherein the length of the belt transport system 11 is smaller than the distance between the guide wheels 7 and 9. The belt transport system 11 is formed as a belt core 12 and has guide wheels 13 and 14. Der FIG. 2 It can be seen that the belt core 12 has a plurality of belts 15 which are parallel and spaced from each other. The upper run 16 of the belt transport system 11 lies in the plane or slightly above the plane of the upper run 10 of the belt run 5.

The belt transport system 11 is designed as a suction belt system 17. For this purpose, there is a suction box below the upper run 16 18, which is connected to a switchable, not shown vacuum source.

Of the FIG. 2 It can be seen that the deflection wheels 7 are mounted to rotate about a common axis 19. The deflecting wheels 13 are mounted on a common axis 20. The deflection wheels 14 are mounted on a common axis 21. The deflection wheels 9 bear on a common axis 22. Coincident with the axis 22 is a rotation axis 23 for a feed drum 24, which consists of several sections 25, which are preferably located between respectively adjacent guide wheels 9. At the sections 25 of the feed drum 24 a registration mark 26 is arranged, which is designed as a clamping application mark 27 and a plurality of stop elements 28 which can be closed to hold the leading edge portion of the metal sheet 2 and opened to release again.

For the page orientation of the transported sheet metal plates 2, a Seitenausrichteinrichtung 29 is provided which has two opposing side guides 30, 31, wherein the side guide 30 has a side roller 32 which is arranged by means of a spring member 33 to a fixed bearing 34. The side roller 32 can accordingly transversely to by means of an arrow 35 in FIG. 2 shifted transport direction are shifted. The side guide 31 is formed as a fixed roller 36 which is arranged on a fixed bearing 37.

According to FIG. 1 follows - seen in the transport direction of the feed drum 24, a printing cylinder 38 and a counter-pressure cylinder 39 in the case of a metal stamping machine. Is in place of the sheet metal printing machine a Blechlackiermaschine available, the printing cylinder 38 is formed as a painting cylinder 38.

In order to supply to be printed or painted sheet metal plates 2 to the printing nip or Lackierspalt between impression cylinder 38 and impression cylinder 39 or coating cylinder 38 and impression cylinder 39, the following function results:

The individual functional elements described above are operated coordinated by means of a machine control, not shown. From the investor sheet metal plates 2 are separated from a sheet metal stack and fed to the belt core 5 by means of the already mentioned, not shown strand. In this case, the front edge 3 of the metal sheet 2 - seen in the transport direction 35 - urged against the leading edge stop 4 of the belt hub 5. This takes place in that the strand, not shown, a higher speed than the Riementrum 5. After taking over the metal sheet 2 from Riementrum 5 this leads the considered metal sheet 2 of the feed drum 24, at which the clamping application mark 27 is in the open position. Before the front edge 3 of the metal sheet 2 reaches the clamping application mark 27, a lateral alignment of the metal sheet 2 by the side guides 30 and 31, the side edges 40 and 41 of the metal sheet 2 act. Since the side guide 30 is disposed displaceable against spring force, the metal sheet between the side guides 30 and 31 is received without play and thereby centered center. Of the FIG. 2 It can be seen that the Seitenausrichteinrichtung 29 in the region of the suction belt system 17, preferably -in the transport direction 35 seen- at the end of the suction belt system 17 are. The crossing of the Suction box 18 of the suction belt system 17 is initially carried out without a suction effect is exerted on the underside of the metal sheet. Only when the suction region of the suction belt system 17 is completely covered by the moving in the transport direction 35 sheet metal 2, the vacuum is activated, whereby the metal sheet 2 is firmly pulled on the belt 15 of the suction belt system 17. Relative movements between the belt 15 and the metal sheet 2 can therefore take place only with increased effort. This has the consequence that in a page orientation of the metal sheet 2 by means of the Seitenausrichteinrichtung 29, the belt 15 are also displaced laterally. Since the belts 15 are formed as flat belts 42 having a low belt thickness, lateral displacement can be easily performed without causing belt slippage or the like. Rather, the flat belt 42 remain in the transport plane and thus ensure that, despite their Seitenauslenkung- a quiet, flicker-free and precise transport takes place. Since the stop elements 28 of the clamping application mark 27 has a lower speed than the belt 15 of the suction belt system 17, encounters in the course of further movement of the metal sheet 2, its front edge 3 against the stop elements 28 of the clamping application mark 27, wherein the suction of the suction belt system 17 thereto leads that a continuous and tight pressing of the leading edge to the application mark 26 takes place, it can lead to a slippage of the belt 15 relative to the metal sheet 2 and / or the metal sheet 2 is slightly bulged resiliently. The application mark 26 then closes and holds the leading edge region of the metal sheet 2 by clamping.

The arrangement is preferably made such that closing of the clamping application mark 27 takes place when the latter approximately 8 to 16 ° before top dead center. The now correctly and reproducibly aligned metal sheet 2 is then - after the Klerrm application mark 27 has reopened after passing the top dead center, the nip or Lackierspalt the follower cylinder (impression cylinder 38 and impression cylinder 39 or paint cylinder 38 and impression cylinder 39), in particular positionally accurate held by the holding means (vacuum) and / or held by suitable means, not shown, fed. Now, the holding action of the holding means (for example vacuum) is switched off again.

In particular, it is provided that there is a speed difference of 15 to 20% between the suction belt system 17 and the belt core 5. Furthermore, the belt core 5 has a speed difference of 5 to 10% relative to the speed of the application mark 26. Here, the belt core 5 is slower than the suction belt system 17 and compared to the suction belt system 17, the application mark 26 moves slower.

In an alternative embodiment, it may be provided that, instead of the suction box 18, a magnet arrangement is provided which exerts a corresponding force effect on the metal sheet 2. However, the prerequisite is that the metal sheet 2 is a ferromagnetic metal sheet.

According to a further embodiment according to FIG. 3 can be provided that instead of the suction box 18, at least one friction roller 45 is provided, which is then not below the upper run 16, but above the upper run 16 and by means of a displacement device 46 in the direction of the upper run 16 moves and can be removed from the upper strand 16 again. Between the friction roller 45 and the upper strand 16, a clamping action for holding the metal sheet 2 can be deployed. Preferably, the friction roller 45 may be associated with a belt 15 supporting the support roller 47, which consist of a plurality of roller sections, which are each associated with the belt 15. Alternatively, it may be provided that at least one support roller 47 interacts with the friction roller 45 so that the belts 15 of the belt transport system are not in this operating zone, but that these downstream or upstream or both downstream and upstream of the friction roller 45 and the support roller 47th are located. If they are arranged upstream and downstream, so the belt transport system is divided into two individual, flat belt having belt transport systems, which are each preferably formed in a trumpet.

The arrangement is further made such that the force exerted on the metal sheet 2 holding effect, whether by vacuum, by magnetic action or by pressure (in particular friction roller) when conditioning the leading edge 3 of the metal sheet 2 in the front quarter to the rear quarter of the longitudinal extent of the metal sheet 2 is exercised. The holding action for pushing the metal sheet against the application mark 26 accordingly takes place in the middle zone of the metal sheet 2.

The FIG. 4 illustrates the friction roller 45. It is guided rotatably about an axis 48, wherein it is held along its longitudinal extent, that is, axially, displaceable. This displaceability is indicated by means of the double arrow 49. By means of spring means 50 acting on both ends, it is axially centered-in the absence of forces. These Centering always leads to a neutral provision of the friction roller 45 as soon as it is no longer in contact with the metal sheet 2.

The FIG. 5 shows a cross section through a designed as a flat belt 42 belt 15 of the suction belt system 17. It can be seen that there is an elongated, rectangular cross-sectional area. Preferably, the flat belt 15 is made of a homogeneous material, such as rubber, so that it has excellent lateral deflection properties, without causing tilting, throwing, etc.

Claims (16)

1. A conveying system of a metal sheet printing machine or metal sheet coating machine, comprising at least one moving front edge stop (4) for the infeed of the front edge (3) of a transported metal sheet (2), comprising a lateral aligning device (29) for aligning the sides of the metal sheet, comprising an infeed drum (24) including at least one infeed mark (26) for the infeed of the front edge (3) of the metal sheet (2), and comprising a belt conveying system (11) including a plurality of belts (15) and intended for aligning the front edge (3) of the metal sheet (2) with the infeed mark (26), wherein a holding means for pressing the metal sheet (2) against the belts (15) is allocated to the belt conveying system (11), characterized in that the belts (15) of the belt conveying system (11) are designed as flat belts (42).
2. The conveying system according to anyone of the preceding claims, characterized in that the belt conveying system (11) is designed as a belt strand (12).
3. The conveying system according to anyone of the preceding claims, characterized in that the holding force of the holding means can be adjusted/readjusted to a presettable value in its size.
4. The conveying system according to anyone of the preceding claims, characterized in that the holding means is a negative pressure device.
5. The conveying system according to anyone of the preceding claims, characterized in that the holding means is a magnetic device.
6. The conveying system according to anyone of the preceding claims, characterized in that the holding means is at least one friction roller (45) pressing onto the metal sheet.
7. The conveying system according to Claim 6, characterized in that the friction roller (45) is guided such that it can be displaced axially.
8. The conveying system according to anyone of the preceding claims, characterized in that the holding function of the holding means can be activated and deactivated.
9. The conveying system according to anyone of the preceding claims, characterized in that the flat belt (42) comprises a belt thickness ranging from 0.5 to 3 mm, preferably about 1.5 mm.
10. The conveying system according to anyone of the preceding claims, characterized in that the infeed mark (26) is designed as a clamp-type infeed mark (27).
11. The conveying system according to anyone of the preceding claims, characterized in that the lateral aligning device (29) is a device centering the metal sheet (2) at the sides thereof.
12. The conveying system according to anyone of the preceding claims, characterized in that the lateral aligning device (29) comprises at least two lateral guides (30, 31), more particularly lateral rollers (32), receiving the metal sheet (2) between them.
13. The conveying system according to Claim 10, characterized by a control device which puts the clamp-type infeed mark (27) of the infeed drum (24) into the clamping state before it reaches the upper dead center position.
14. The conveying system according to Claim 13, characterized in that the clamp-type infeed mark closes at 0 to 20°, more particularly 8 to 16°, before the upper dead center position.
15. The conveying system according to anyone of the preceding claims, characterized in that the front edge stop (4) is arranged at a belt strand (5).
16. The conveying system according to anyone of the preceding claims, characterized in that a suction zone, magnetic zone and/or friction roller press-on zone forming the holding means are/is allocated to the belt conveying system (11), said suction zone, magnetic zone and/or friction roller press-on zone exerting a holding force on the metal sheet (2) abutting against the infeed mark (26) with its front edge (3) approximately in the region of its front quarter to rear quarter of its longitudinal extension.

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