WO2010057466A1

WO2010057466A1 - Brake device for braking and depositing blanks extending laminarly

Info

Publication number: WO2010057466A1
Application number: PCT/DE2009/001606
Authority: WO
Inventors: Hans-Dieter Jacobi; Peter Prante
Original assignee: Rotodecor Gmbh Maschinen- Und Anlagenbau
Priority date: 2008-11-20
Filing date: 2009-11-16
Publication date: 2010-05-27
Also published as: US20110214951A1; DE112009003336A5; DE102008058337A1; EP2346763A1

Abstract

The invention relates to a brake device for braking and depositing workpieces (4), particularly paperboard containers, extending laminarly and fed at a distance from each other, wherein the workpieces (4) are fed into a braking roller (7), the circumferential speed thereof being lower than the feed speed of the workpieces, and at least one cam (14, 15) presses a workpiece (4) passing by the braking roller (7) against the braking roller (7) at the end of the workpiece (4) in the feed direction (8) and reduces the speed of the workpiece (4).

Description

Braking device for braking and depositing areal extending blanks

Description:

The invention relates to a braking device for braking and depositing on a stack of areally extending, spaced supplied workpieces, such as in particular blanks of cardboard or the like made of flexible materials.

Various devices for processing areal extending materials, such as printing and embossing devices, cutters and similar production lines have both a high processing speed and a high transport speed of the material to be processed or processed, with speeds of about 10 m / sec. are quite common.

This raises the problem at the end of such a production line, the workpieces, especially from a flexible material such as blanks or the like slow down and store material gently.

Low material protection is a slowing down of the workpieces by the emergence of the same on attacks. In addition, a clean stacked placement of the workpieces is rarely possible. In most cases, the braked workpieces then simply fall into collection containers. Such braking systems for mostly robust workpieces are hardly suitable for flexible, stacked materials such as sheets, since these deform with the impact on a stop. This results an unacceptable, irregular storage of workpieces on a pile.

In particular for the braking of sheets of paper, cardboard or the like, a so-called trailing edge braking system is described in DE 20 2007 012 356 Ul, for which recourse is made to an elaborate pneumatic sheet brake system.

Against this technical background, the invention has the object to provide a braking device of the type in question available that gently slows down mechanically supplied easily supplied workpieces, and beyond that in a simple manner to a variety of workpieces can be adapted.

This technical problem is solved in a braking device for braking and depositing areally extending, spaced supplied workpieces, in particular of cardboard, according to claim 1 by the measures that the workpieces are fed to a brake drum whose peripheral speed is smaller than the feed rate of Workpieces, and that in the feed direction end of the workpiece at least one cam presses a brake roller passing workpiece against the brake roller and reduces the speed of the workpiece.

The braking device according to the invention has a number of advantages. In particular, it is best suited for cardboard or other, non-self-supporting workpieces, for example, from films in which it would come to a deformation on emergence on a stop. Such is excluded by the end-fitting of the workpiece between the cam and the brake roller. Also a not self-supporting, easily deforming workpiece such as a cardboard or the like retains a largely stretched position or the workpiece receives the time to take before laying on a stack again a stretched position.

In a constructive embodiment can also be provided that the cam protrudes a roller. This structurally simple solution makes it possible to adapt the speed components of roller and brake roller to each other by simply setting a drive. In particular, the circumferential speed of the roller will then be set in such a way that the cam covers a revolution in time corresponding to the feed of a workpiece. In a preferably constant spacing of the supplied workpieces can thus be ensured in a simple manner that the cam engages only at the end of the workpiece to press the workpiece against the brake roller and thus decelerate.

The preferably rounded, the workpiece pressing against the brake roller pressing surface of the cam and the surface of the brake roller can run on each other in the nature of the surfaces of a pair of rollers, with a speed difference in the regularly

Circumferential speeds of the contact surface of the cam and the brake roller will occur. However, the forces caused thereby on the workpiece can be minimized by choice and design of the cam surface, so that there can be no damage to the workpiece by the deceleration process.

In a further constructive embodiment it is provided that the roller is arranged above the brake roller and that the axes of the roller and the brake roller lie in a common plane transverse to the feed direction. These measures allow easy storage of the two rolls and their drives in the manner of calender rolls.

Due to the horizontal arrangement then results in a gap between the roller and the brake roller, which, at a constant peripheral speed of the roller and thus the cam, periodically released or closed by this. The supply of the workpieces takes place in a plane lying between the roller and the brake roller, so that the workpiece enters the open gap and only with closing of the gap by the cam at the end of the workpiece, this is pressed down on the brake roller. As a result of the initially free entry of the workpiece into the gap between the roller and the brake roller and the downward movement of the end of the workpiece during deceleration occurs in elastic workpieces such as sheets of a cardboard or the like to an upward deflection.

As appropriate, it has been proven ^' when the cam and / or the roller is operationally replaceable or are. Adapting to the material thickness of the workpiece is therefore unproblematic because, depending on the material thickness of the workpiece, the height of the cam can be adjusted over the roller. In addition, by the choice of material of the cam, for example a stainless steel, a plastic or a rubber, the surface finish of the workpiece are taken into account, so that they are gently pressed even at a speed difference of the peripheral speeds of the brake roller and the cam. Such can also be taken into account by the surface finish of the contact surface, for example by a coating or structure, such as scales, grooves or the like. It has also proven to be advantageous if the cam is adjustable transversely to the feed direction. In particular, the cam can be fixed axially displaceable on the roller so that, for example, printed cardboard can be detected and braked outside the actual pressure range. The printed image of such a cardboard remains securely undisturbed. Furthermore, by this measure, for example. Punches be taken as a carry handle.

In the braking device according to the invention it is further provided that the angular velocity of the roller carrying the cam is adjustable. In this way, the time interval can be predetermined, in which the open gap remains between the brake roller and the roller, so that a workpiece can enter this gap undisturbed. Only at the end of the workpiece is the cam end of the workpiece pressing it down against the brake roller. By this measure, various lengths of the workpieces are taken into account.

In the case of frequently changing dimensions of workpieces or differently spaced workpieces, a sensor system may further be provided which measures the length and / or distances of workpieces in the feed direction and in which a controller sets the angular velocity such that the cams press each workpiece against the brake drum , Thus, an adaptation to different lengths of the workpieces can be carried out in a simple manner and also irregularities in the sequence of feeding the workpieces can be easily compensated. Likewise, the point of application of the cams on the workpieces can be adjusted. In the braking devices in question for braking and depositing areal extending workpieces occurs in the braking zones regularly to a jam of the workpieces. To counteract this problem, workpieces after passing through the braking device according to the invention are scaly, but spaced superimposed on a magazine, a pallet or the like fed in a dropping motion. In order to make this possible safely, the roller follows in the feed direction at least one guide band which rotates above the workpiece. An emigration of the workpieces upwards due to bending as a result of the free entry into the gap and the end-side pressing down to the brake roller is thus reliably prevented. Rather, the scaly superimposed workpieces are moved away from the guide belt and stored on, for example, a pallet or in a magazine in the falling motion.

There may be gaps and cams across the feed direction. If, in particular, a centrally arranged, central guide band is provided, it is bordered by two cams, as it were. In particular labile workpieces such as cardboard or similar bows, which regularly comes to a bending in the braking process, are so safely guided and filed.

Appropriately, it is further provided that the rotational speed of the guide belt of the feed speed of the workpieces approximately equal, in particular is the same, so that the workpieces with entry into the gap between the roller and the brake drum experience no speed reduction, if, for example. Bends bending the guide band invest. In a constructive design can be provided that a drive shaft of a drive and one of the guide band are connected via a belt, which eliminates the need for an independent drive of the guide band. It is particularly thought that the drive of the guide belt via a belt drive together with the drive of the workpieces of the braking device supplying conveyor devices such as conveyor belts or the like.

In production lines for workpieces, in particular so-called in-line production lines, the above-described braking device will be arranged at the end. After stacking the workpieces, a transfer to a packet inverter can take place, which then turns the stack on a conveyor belt or another conveyor. For an increase in capacity can also be provided that two brake devices according to the invention a switch is connected upstream. It is preferred that the braking devices following the turnout are arranged offset in height and that a transfer device transfers the stacked by the braking devices packages to a packet inverter. A space-saving design of a high-capacity production line is thus made possible.

The invention will be explained in more detail with reference to the drawing, in which only exemplary embodiments are shown schematically. In the drawing shows:

1 is an isometric view of a brake device according to the invention,

2 is a side view, 3: a plan view,

4 is an enlarged view and is based on the

Fig. 5: the use of the braking device further explained.

FIG. 1 shows, in an isometric view, a braking device 1 according to the invention for braking and depositing areally extending, in particular equally spaced, supplied workpieces 4, preferably cardboard boxes, for example, printed, punched and singulated at high speed in a production line 2 (not shown) for example, 500 m / min and with high clock frequency of about 10 pieces / sec. the braking device 1 are supplied.

Braked by the braking device 1, such workpieces 4 are stored in bspw. A magazine 3 exactly stacked.

In the illustrated embodiment, the workpieces 4 are supplied to a linkage 5 of a conveyor belt 6 a brake roller 7 in the feed direction 8 according to the arrow. The rotating according to arrow 9 brake roller 7 with belt drive

10 has a peripheral speed which is dimensioned significantly smaller than the feed speed of the sheets 4 in the feed direction 8.

Above the brake roller 7, a further roller 11 is arranged, wherein the axis 12 of the brake roller 7 in a plane transverse to the feed direction 8 with the axis 13 of the roller

11 is arranged. In a plane 22 of the gap between the roller 11 and the brake roller 7, the supply of the workpieces 4 takes place.

The roller 11 projects two cams 14, 15, which, as shown in FIG. 4, press a workpiece 4 passing through the brake roller 7 downwards against the brake roller 7 and thus reduce the speed of the workpiece 4.

The angular velocity of the shaft 11 is adjusted so that the cams 14,15 the workpiece 4 always press against the end of the brake roller 7, in which one revolution of the cam 14, 15 takes as long as a workpiece 4, taking into account the distance of the workpieces 4 with each other is supplied.

The cams 14,15 or possibly the complete roller 11 can be replaced operationally and / or the cams can be adjustable transversely to the feed direction 8, so that an adaptation to different workpieces 4 is easily possible. If the workpiece 4 is, for example, a sheet printed on the upper side, then the cams 14, 15 are set in such a way that such a workpiece 4 on unprinted surfaces ends with the brake roller 7 passing from the cams 14, 15 against the brake roller 7 can be pressed. Damage to the upper-side print image of the workpiece 4 is then excluded. Correspondingly, geometries of the workpieces 4 can also be taken into account, for example punched-out sections.

On the basis of the above-described measures, an adaptation of the preferably rounded contact surface 16 by a suitable material selection of the cams 14, 15, a coating or surface structuring on the workpieces 4 can be carried out for a gentle pressing against the brake roller 7. To further account for different lengths of workpieces 4, the angular velocity of the roller 11 is adjustable, so that the interval at which the cams 14,15 impinge on the brake roller 7 while enclosing a workpiece 4 is adjustable. To automate such, not shown in the drawing sensor can measure the length and / or distances of workpieces in the feed direction 8, after which a controller the

Angular velocity of the shaft 11 is such that the cams 14,15 each workpiece 4 press exact end in time with the feed against the brake roller 7 down.

Are the workpieces 4 relatively easily bendable sheets, they will, as shown in Figure 4, with the entry into the free gap between the roller 11 and the brake roller 7 and further with the deceleration and after release by the cams 14,15 stop until they impinge on the front edge side on a guide strip 17 rotating above the workpieces 4. As a result of the high clock frequency of braked workpieces 4, these are, as indicated, in an imbricated manner superimposed on one another and fed from the guide belt 17 to the magazine 3 and stored stacked neatly in a falling motion.

Figure 3 also shows that the cams 14,15 and the guide belt 17 are set to gap, here the centrally located guide belt 17 is bordered by the cams 14,15 as it were.

The rotational speed of the guide belt 17 corresponds substantially, preferably exactly the feed rate of the workpieces 4 in the feed direction 8 in front of the braking device 1. Thus, no reduction in speed of the workpiece 4, if this is done with the free entry into the Gap between the brake roller 7 and the roller 11 and the braking bends and rests on the front edge side of the guide belt 17.

A drive of the guide belt 17 can be done in a simple manner via a belt 18 which is driven by an electric motor drive 19 of the feeders of the workpieces 4 as the conveyor belt 6 with. The brake roller 7 and the roller 11 each have their own drives 20,21, so that the peripheral speeds of the two rollers 7,11 in a simple manner independently of each other, can be set for themselves.

FIG. 5 shows on the right a transport device 23, for example two transport belts enclosing a workpiece, at the end of a production line, not further shown, for workpieces extending in a planar manner. This area extending, spaced in Fig. 5 supplied from the right workpieces such as cardboard at the end of the transport device 23 to a switch 24, are operated by the two braking devices 25,26 according to the invention.

The braking devices 25,26 put the workpieces braked as a stack 27,28. This stacking of the workpieces is staggered in time, so that each one of the stack 27,28, which is completed, can be transferred via transport devices 29,30 to a height-adjustable transfer device 31. This is, provided with a height-adjustable conveyor device 32, shown in Fig. 5 in two positions, Stapel.33 in a packet inverter 34, which records after turning taken stack this example, on a transport device 35 for removal.

Claims

Claims:

1. Braking device for braking and depositing areal extending, spaced supplied workpieces, in particular of cardboard, characterized in that the workpieces (4) of a brake roller

(7) whose circumferential speed is smaller than the feed speed of the workpieces, and that in the feed direction (8) end of the workpiece (4) at least one cam (14,15) a the brake roller (7) passing workpiece (4) against presses the brake roller (7) and reduces the speed of the workpiece (4).

2. Braking device according to one or more of the preceding claims, characterized in that the cam (14,15) of a roller (11) protrudes.

3. Braking device according to claim 2, characterized in that the cam (14,15) covers a revolution in the time corresponding to the supply of a workpiece (4).

4. Braking device according to one or more of the preceding claims 2 to 3, characterized in that the roller (11) over the brake roller (7) is arranged and that the axes (12,13) of the roller (11) and the brake roller (7 ) lie in a common plane transverse to the feed direction (8).

5. Braking device according to one or more of claims 2 to 4, characterized in that the supply of the workpieces (4) in a between the roller (11) and the brake roller (7) lying plane (22).

6. Braking device according to one or more of the preceding claims, characterized in that the cam (14,15) and / or the roller (11) with cam (14,15) is operatively interchangeable / are.

7. Braking device according to one or more of the preceding claims, characterized in that the cam (14,15) transversely to the feed direction (8) is adjustable.

8. Braking device according to one or more of the preceding claims, characterized in that the angular velocity of the cam (14,15) bearing roller (11) is adjustable.

9. Braking device according to claim 8, characterized in that a sensor measures the length and / or the distances of workpieces in the feed direction and that a controller sets the angular velocity of the roller such that the cam presses each workpiece end against the brake roller.

10. Braking device according to one or more of the preceding claims, characterized in that in the feed direction (8) of the roller (11) at least one above the workpiece (4) rotating Pührungsband (17) follows.

11. Braking device according to one or more of the preceding claims, characterized in that cams (14,15) and guide belts (17) transversely to the Feed direction (8) are set to gap.

12. Braking device according to one or more of the preceding claims, characterized in that the rotational speed of the guide belt (17) corresponds to the feed rate of the workpieces (4).

13. Braking device according to one or more of the preceding claims, characterized in that a drive shaft of a drive (19) and one of the guide belt (17) via a belt (18) are connected.

14. Production line for workpieces, characterized by an end provided braking device (25,26) according to one or more of the preceding claims.

15. Production line according to claim 14, characterized in that the braking device (25, 26) is followed by a packet turner (35).

16. Production line according to one or more of the preceding claims 14 to 15, characterized in that two braking devices (25,26) a switch (24) is connected upstream.

17. Production line according to claim 16, characterized in that the switch (25) following brake devices (25,26) are arranged offset in height and that a transfer device (31) of the braking devices (25,26) stacked packets (27 , 28) to a packet inverter (35) passes.