EP0333986B1 - Receiving device - Google Patents

Description

The proposed device relates to the depositing of sheets leaving a sheeter, according to the preamble of claim 1.

A device of this type is already known, for example, from DE-A-14 61 211. In this device, sheets that have been separated from a web by a cross cutter run to a collecting cylinder. When enough sheets have been collected on this collecting cylinder these collected sheets are combined with a sheet also leaving the cross cutter. This creates a package of arches, which consists of at least two arches. This sheet package arrives in a further strip line, the drive of which can be delayed if necessary, so that the sheets are picked up by this strip line at a relatively high speed, held between the strips of this strip line and then slowed down due to the drive of the strip line and then placed on a tray can. Since the strips of this strip line have to be guided, they are looped around guide rollers or guide rollers which are mounted in a stationary manner in a machine frame. If the belts are decelerated and then of course accelerated again, then of course not only the belts themselves, but also the guide elements for the belts and at least part of the associated drive must of course also be accelerated or decelerated. This causes high mass forces to master these processes and also requires a lot of energy.

From DE-B-10 31 322 a further device is previously known in which sheet packs to be deposited are braked by essentially gripping jaws gripping the rear end of the sheet pack to be deposited between belts rotating at a relatively high speed. With the help of these clamping jaws, the rear end of the sheet package is gripped and forced to a slow speed, however, the speed of the sheet packages to be deposited is changed abruptly. The individual sheets of the sheet package can slide against each other, for example, which makes it difficult to deposit all sheets properly. In addition, unwanted markings can occur on the sheet by gripping them with clamping jaws or the like. In addition, it is proposed in DE-B-10 31 322 to mount the band line downstream of the collecting cylinder on a hinged holder consisting of at least two parts. This holder must be opened every time the sheet package assumes the slow speed. This also results in undesirably large inertia forces, which leads to a limitation of the working speed of this device.

On the basis of GB-A-857 871, another device is known in which sheet packs are to be pushed one over the other in such a way that the sheet packs which initially follow one another come to lie overlapping one another in a scale-like manner. In this case, the preceding sheet bundle is pressed onto a slower rotating belt with the help of rollers running between the belt lines. The fact that the slowdown is enforced with the help of rollers, this device very easily results in undesirable markings on the sheet to be deposited. In addition, it is also possible here that the sheets of a sheet package slide very easily against one another, which is also not desirable. In addition, the individual sheet packages must even be able to slide against each other if they get into the tray. This way it is not guaranteed that there is a stack with straight edges in the tray.

Finally, it is known from DE-B-21 41 340 to arrange the tape line device in a device for depositing sheets so that either the fast rotating belts or the slowly rotating belts grip sheets between them. Here, however, only sheets are overlapped, so that only the rear parts of these sheets in the running direction of the sheets are braked. This results in relatively abrupt changes in the speed of the sheets. In addition, a cross cutter is not directly downstream of this device and, moreover, does not contain a device for collecting several sheets.

Based on this prior art, the applicant has the task of improving this device so that there is no abrupt change in the speed of the sheet, the sheet guide elements and their drives when the sheets or sheet packets to be deposited are slowed down, and moving masses are kept as low as possible .

This object is achieved in that tape line devices have upper and lower tape lines which, in the area downstream of the collecting cylinder, have an essentially identical engagement line with the sheets to be deposited, that the second tape line device consisting of individual tapes reaches between the individual tapes of the first tape line device and that Both the upper and the lower ribbon cables consist of at least one fast and one slow rotating ribbon cable and either the fast rotating lower and upper ribbon cables or the slowly rotating lower and upper ribbon cables grasp the bends to be deflected between them, by changing the routing of the ribbon cables when braking of the bend package, the bend package increasingly loses contact with the fast rotating ribbon cables and increasingly gains contact with the slowly rotating upper and lower ribbon cables.

The fast or slow rotating ribbon cables can have different engagement times with the arch packages to be deposited. The guide rollers for the fast, slow, lower and upper belts are mounted in a corresponding frame in such a way that the path of the respective belt is essentially fixed for the entire operating time of the machine. The tapes of the individual tape lines can at least part of their way described in one cycle are deflected from their original path with the help of fixed but pivotably mounted cams. These cams are mounted in the machine frame in such a way that when one of these cams is pivoted, the associated slow or fast, lower or upper band runs through an arc, which arc can also be a double arc, ie an arc in the sense of a large Latin S, so that the sheet to be deposited or the sheet package to be deposited is given a so-called pinching.

Because of the solution chosen, the sheets or sheet packages to be deposited can be conveyed either at a relatively high or at a relatively low speed. When changing from one speed to the other, only the lowest possible mass is moved, this movement is also not necessary at high belt speeds, but can also be kept low. In addition, the movement of the cams is spread over a relatively long period of time, which can also be used to brake the bends. The sheets are not pulled obliquely during the braking process. They run out of the entire ribbon line as separate, separate bundles of sheets, so they do not have to be stacked on top of each other in the filing unit, but can be placed one on top of the other and therefore do not interfere with the formation of a later stack that contains several or many sheets or bundles of sheets. In addition, a relatively large ratio of relatively faster to relatively slower becomes Speed of the sheets or bundles of sheets to be deposited achieved. This ratio can not only 1: 2, but for example some other ratio, such as. B. 1: 5 or 1:10. The relatively high speed can also be absolutely very high, so that it does justice to today's machining speeds of today's machines or even exceeds them. In this way it is possible that the storage of the sheets no longer leads to a limitation of the running speed of the upstream machine.

The proposed device is explained in more detail with reference to an exemplary embodiment schematically illustrated in the attached figures. This embodiment can be modified in various ways without leaving the idea on which the device is based. In the present context, non-essential machine parts are not shown in the figures because of a clearer representation. However, the parts which are not shown are sufficiently known to the person skilled in the art.

• Fig. 1: Seitenansicht
• Fig. 2: Seitenansicht, unmittelbar stromab von Fig. 1
• Fig. 3: Schnitt III-III in Fig. 2, bei Nichtzeichnung der den Sammelzylinder umschlingenden Bandleitung

The individual figures mean:

• Fig. 1: side view
• 2: side view, immediately downstream of Fig. 1st
• Fig. 3: Section III-III in Fig. 2, when the ribbon cable wrapping around the collecting cylinder is not drawn

A web 1 made of paper, foil, fabric, metal, plastic or the like is fed to a cross cutter by a conveyor device, which consists for example of rollers 2 and 3. This cross cutter consists, for example, of a revolving cylinder 4, to which a knife 5 is fastened, and a stationary and fixed bottom knife 6. Instead of such a cross cutter, however, any other cross cutter can also be used, for example, such a cross cutter, in which the revolving knife an upper and a lower rotatable cylinder are attached. The type of upstream cross cutter has no significant influence on the design of the proposed filing system.

After sheets 7 have been cut off from the web 1 by the cross cutter, these sheets (shown better in FIG. 1 because they are detached from the supporting tape line) run one behind the other to a tape line system in which, among other things, a collecting cylinder 8 is integrated. On that side of the collecting cylinder 8 which faces away from the cross cutter, pivotable tongues 9 are arranged in such a way that sheets 7 arriving from the cross cutter can either be fed to the collecting cylinder 8 or passed past the collecting cylinder 8. Only one of these tongues can be seen in FIGS. 1 and 2. Further tongues of the same size and of the same size can be arranged one behind the other in the viewing direction of FIGS. 1 and 2 and each leave a space between them. In this way, each Incoming bends are optionally directed in the desired direction, and space is also created so that tapes and tape lines of the tape line system can pass between adjacent tongues. The mutual spacings of the tongues can also be so large that a plurality of relatively narrow adjacent strips can run between two tongues. These tapes can also keep a distance between them.

Although only one strip of each strip line can be seen in FIGS. 1 and 2, a plurality of strips of the same type can be seen one behind the other in FIGS. H. in reality be arranged side by side. Each band can have a certain distance from its neighboring band, so that it is possible for different bands of different band lines to interlock like a prong or for bands of one band line to pass between the bands of another band line.

The strips of the strip line 10 not only wrap around the collecting cylinder 8, but also the guide rollers or guide rollers 11, 12, 13 and 14. They are arranged below the path of the sheets or packs of sheets to be deposited and are therefore called "lower bands".

Downstream of the collecting cylinder 8 there is a ribbon line 15 with so-called slow lower ribbons. The strips of this strip line loop around guide rollers or guide rollers 16 to 21. Next to it there is a ribbon line 22 with relatively fast lower bands. The tapes of this ribbon line loop around the guide rollers or guide rollers 23 to 26. The guide rollers / guide rollers 23 lie behind the guide rollers / guide rollers 16 in the direction of view of FIGS. 1 and 2. The guide rollers 23 and 16 also have the same diameter and therefore cover one another in FIGS. 1 and 2. The guide rollers 25 and 28 are driven, the guide roller 25 being driven at the relatively high and the guide roller 18 at the relatively low speed. In addition, the slow-moving belts 15 are arranged one behind the other in the direction of view of FIG. 1, ie between the fast rotating belts 22.

At least one relatively fast upper belt line 27 and one slowly rotating upper belt line 28 are arranged one above the other in the direction of view of FIGS. The belts of the belt line 27 loop around the guide rollers or guide rollers 29 to 32, the belts of the slow belt line 28 the guide rollers or guide rollers 33 to 36. One of the respective guide rollers is driven, for example guide roller 29 is driven as well as guide roller 25, so that both the belts lower fast tape 22 and the tapes of the upper fast tape 27 get the same speed. Guide roller 33 is driven, for example, at the same speed as guide roller 18, so that the tapes of the upper slow tape line 28 get the same speed as the tapes of the lower slow tape line 15.

Through the choice and definition of the different guide rollers, the paths that the ribbon cables describe during their circulation are essentially determined. These paths are laid so that there is essentially between the guide rollers / guide rollers 16, 23 and 35 on one side and 21, 26, 32 and 36 on the other side for both the upper and for the lower and both for each rapid as well as for the respectively slow ribbon cables results in an engagement path on which the ribbons of the various ribbon cables can be pressed against the sheets or sheet packages to be deposited. This engagement distance is essentially the same length for the upper and lower bands and for relatively fast and relatively slow bands. The upper fast bands are preferably arranged one behind the other in the viewing direction of FIG. 3 above the lower fast bands, that is to say in the same effective plane. Analogously to this, the upper slow bands lie above the lower slow bands, also one behind the other in the viewing direction of FIG. 3. In this way, the sheets or packages of sheets to be deposited can be gripped by the belts and transported away by the cross cutter with the help of the rotating movement of the belts.

Axes 37 to 40 are fixed in place within the engagement path, but can be pivoted.

A first cam 41 and a second cam 42 are fastened on the axis 37. The cam of the first cam 41 extends, for example, over a center angle of 90 degrees and the cam of the second cam 42 extends, for example, over a center angle of 270 degrees. In this way, the effective cams complement each other to a full angle of 360 degrees. Corresponding to the number of slow or fast ribbon lines arranged one behind the other in the direction of view of FIGS. 1 and 2, an equal number of cam disk pairs 41 and 42 are lined up in succession on the axis 37, preferably alternately, such that a first cam disk 41 is capable of each , by pivoting the axis 37 with its effective surface "from the inside" against a fast upper band of the fast upper band line 27. Analogously to this, each cam plate 42 is able to press against a slowly revolving band of the slow upper band line 28 by pivoting the axis 37. The fact that the cam disks 41 and 42 are fastened on the same axis 37 and, moreover, mutually out of phase, ensures that, when the axis 37 is pivoted appropriately, only one of the two types of cam disks becomes effective. This means that, depending on the angle at which the axis 37 is pivoted, either the respective band of the fast band line or the respective band of the slow band line is deflected out of its originally predetermined run as the sheet bundle passes.

Analogously to this, first cams 43 and second cams 44 are fastened on the axis 38. When the axis 38 is pivoted, in particular as a result of a tooth engagement with gear wheels attached to the axes 37 and 38, the first cam plate 43 is pivoted in the same manner but in the opposite direction of rotation as the first cam plate 41 and the second cam plate 44 analogously to the second cam plate 42 The radial elevation of the first and second cams is so large, preferably the same, that when the effective center angle comprising the elevation is pivoted in, the respective ribbon cables are deflected out of the way that they would follow if the central angle of the cam disk, which is not a radial elevation, against the respective ribbon cables is directed.

Corresponding to the axes 37 and 38, a pair of axes 39 and 40 can also be pivoted on the outlet side of the strip line system and is mounted in a stationary manner in the machine frame. First cams 45 and second cams 46 are fastened on the axis 39, first cams 47 and second cams 48 are fastened on the axis 40. The first cams 41, 43, 45 and 47 are identical to one another and are fastened on their axes in such a way that they rotate together the same angle of rotation can be pivoted. Care is taken to ensure that, for example, with the aid of a toothed belt connecting the axes 37 to 40, the swivel angles of the axes 37 to 40 are kept constant with one another. Next to it are the second cams 42, 44, 46 and 48 are identical to one another and can be pivoted, for example, using the same toothed belt by the same angle among one another.

In addition, care is taken to ensure that the guide rollers 32 of the fast tape line 27 have a smaller diameter on the outlet side of the tape line system than the guide rollers 36 of the slow tape line 28. Similarly, the diameter of the guide rollers 26 is smaller than that of the guide rollers 21. This ensures that sheets or sheet packs arriving between the tape lines are in any case conveyed out of the tape lines at the slow speed. In addition, however, it is optionally also possible to let the sheets run through the ribbon lines at the faster speed, so to speak, unchecked, if this should be desired by the user when using the device.

From the perpendicular through the center of the collecting cylinder, the perpendicular through the centers of the axes 37 and 38 preferably have an unequal distance. Analogously to this, the perpendiculars placed through the centers of the axes 39 and 40 are preferably unequal to one another from the vertical through the center of the collecting cylinder 8. Due to the chosen construction of the position of those axes about which cams can be pivoted and the amount of the selected pivot angle, either the first cams 41, 43, 45 and 47 can be against the fast rotating belts of the upper belt line 27 or the lower belt line 22 pressed are and these bands are thus slightly deflected from their path, which is essentially predetermined by the guide rollers 31, 36, 16 and 21. In this way, a sheet or a sheet package can be clamped between the rapidly rotating upper and lower ribbon lines and quickly transported to a storage area 49. By swiveling the axes 37 to 40 appropriately, however, the rapidly rotating ribbon cables can also be released from the pressure exerted by the first cam disks 41, 43, 45 and 47 and instead the ribbons of the upper and lower slow-moving ribbon cables can be released with the aid of the second cam discs 42, 44, 46 and 48 are pressed against the sheet packs. If, in addition, the pivoting is carried out in a certain temporal relationship to the arrival of the sheets, then it is possible that, for example, four sheets are collected on the collecting cylinder 8 when the tongues 9 are in the appropriate position, and that these four sheets are preferably followed by a fifth sheet run together between the fast running upper and lower ribbon lines 27 and 22. When the end of the sheet package has left the collecting cylinder 8, the tongue 9 can be pivoted on the one hand in order to enable the collection of another sheet package on the collecting cylinder. On the other hand, by pivoting the axes 37 to 40, the pressure exerted by the fast belts on the sheet package can be released and instead the slowly rotating belts 28 and 15 can be pressed against the sheet package. Because the axes 37 and 38 and the axes 39 and 40 are offset from one another, the package of sheets to be deposited passes through an S curve. As a result, the force with which the circulating belts grip the sheet bundle between them is increased on the one hand, and on the other hand the sheet bundle itself is deflected during its run, which increases its stability. As a result of corresponding pivoting of the axes 37 to 40 and the first and second cams attached to them in a phase-correct manner, the sheet package increasingly loses contact, for example, with the fast rotating belts, gains increasing contact with the slowly rotating upper and lower belts and is thereby braked. A certain path is available for this braking process, which is given by the length of the engagement distance, ie by the distance between the guide rollers 16 and 35 on one side and the guide rollers 26/21 and 32/36 on the other side. The pivoting of the axes 37 to 40 is such that the pressure of the relatively fast running upper and lower ribbon lines and the pressure of the relatively slow rotating upper and lower ribbon lines and the time length of this pressure on the sheet package 7 clamped between them according to the number of Collection cylinder to be collected arc is changed. A corresponding phase-precise drive for axes 37 to 40 complements the device.

The tapes of the various ribbon cables consist of commercially available, elastic, preferably plastic. Appropriate drives complement the facility. The ribbon lines are preferably across the width of the sheet package to be deposited Either distributed so that they capture the sheet on unprinted areas, provided that the sheets should have been printed by a previous processing process, or printed or coated sheets are dried so strongly before reaching the storage system that slipping tapes of the storage system on a sheet from the Printing ink or coating agent can no longer rub off existing order. The fact that the cams for the fast rotating ribbon cables have a different effective length (at their effective center angle) than the cams for the slowly rotating ribbon cables result in different engagement times for the fast or the slow ribbon cables. These central angles can have different values, depending on how many sheets are to be collected on the collecting cylinder. The fast rotating ribbon lines preferably have the same surface speed as the collecting cylinder. The slowly rotating ribbon cables have a running speed which corresponds to the number of sheets to be deposited together in a sheet package, ie for example a quarter or a fifth of the speed of the fast ribbon cables. If necessary, the cams 48 can also be omitted, so that the sheet packets to be deposited at the exit of the depositing / conveyor system are in any case gripped by the slowly moving conveyor belts.

Instead of a single deposit 49, several deposit points, for example three in a row, can be arranged in such a way that sheet packs to be deposited optionally one of the storage locations or another can be fed. In this case, it is advantageous if the speed at which the sheets or bundles of sheets to be deposited are deposited is the same at all depositing locations.

The mass forces that occur when braking the bends are low. There are therefore only the lowest possible, in a practical sense, no forces that could have an undesirable effect on the course of the entire device.

Claims (5)

1. Device for depositing sheets (7) leaving a transverse cutter (5, 6) and cut from a web (1) of paper, film, fabric, metal, plastics or the like, having a belt guide system (15, 22, 27, 28) downstream of the transverse cutter (5, 6) and a collecting cylinder (8) temporarily receiving at least one sheet (7), the sheet or sheets (7) on the collecting cylinder (8) being combined with a sheet (7) subsequently leaving the transverse cutter (5, 6) and the sheets (7) combined to form a sheet bundle being slowed together and deposited with the aid of a first belt guide device (22, 27) and with the aid of a second belt guide device (15, 28) characterized in that the belt guide devices have upper (27, 28) and lower (15, 22) belt guides which, in the region downstream of the collecting cylinder (8), opposite the sheets (7) to be deposited, have a substantial similar engagement section, in that the second belt guide device (15, 28), comprising individual belts ( (15, 28), reaches between the individual belts of the first belt guide device (22, 27), and in that both the upper (27, 28) and the lower (15, 22) belt guides comprise at least one rapidly (22, 27) and one slowly (15, 28) revolving belt guide, and either the rapidly revolving lower and upper belt guides or the slowly revolving lower and upper belt guides grip the sheets to be deposited between them, with the sheet bundle, as a result of the altered guidance of the belt guides on braking the sheet bundle, increasingly losing contact with the rapidly revolving belt guides and increasingly gaining contact with the slowly revolving upper and lower belt guides.

2. Device according to Claim 1, characterized by different periods of engagements of the rapidly (22, 27) or the slowly (15, 28) revolving belt guides.

3. Device according to Claim 1, characterized by a fixed mounting of guide rolls (16, 21, 23, 26, 31, 32, 35, 36) for the rapid, slow, lower and upper belt guides (15, 22, 27, 28) such that the path of the respective belt guide (15, 22, 27, 28) is substantially fixed for the entire operating time of the machine.

4. Device according to Claim 1, characterized by a control device for altering guidance of the belt guides, which contains cam plates (41 to 48) which are mounted to be fixed and pivotal.

5. Device according to Claim 4, characterized by mounting the pivotal cam plates (41 to 48) such that, by pivoting the associated cam plates (41 to 48) to deflect the belt guides, the respective slow or rapid upper or lower belt describes a curve.

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