EP1167259A2 - Sheet stacking device and method for controlling the introduction of sheets in a paddle wheel - Google Patents

Abstract

The method is especially. for bank notes fed into sorter pockets (2) of a rotating stacker wheel (1). The presence of notes at a distance to the stacker is determined and evaluated by a sensor. During the evaluation process, a group of at least two notes (7A,B) is taken into consideration, and the kinematics of the stacker are altered dependent upon the evaluation result of this group. The method can be changed from synchronous intake speed, where the note speed is at a defined ratio to the stacker wheel speed, to individual note flow control, where the wheel is controlled individually for each note or each group, if irregularities in note flow are shown up by the evaluation result.

Description

The invention relates to a sheet material stacking device, in particular a spiral stacker, and a method for controlling the infeed of sheet material in Storage compartments of a continuously or intermittently rotating stacker wheel.

Spiral stacker are used for example in sheet inspection and -sorting devices used in which stack of sheets, for example Bundles of banknotes, first separated, then for test purposes passed through a sensor system and finally by means of spiral stackers can be stacked in different stacks. The function The spiral stacker consists of the single sheets that are transported by turning it into a spiral path before it is finally deposited decelerate. It is not critical in most applications, if not every storage compartment of the stacking wheel with one sheet when stacking is occupied or if a storage compartment exceptionally contains more than one Sheet is occupied.

However, care should be taken to ensure that the sheets are handed over at the moment of delivery Do not collide with the stacker wheel with a partition separating the storage compartments. The leading edge of a sheet should therefore be the stacker wheel in one ideal input point between two partitions to be fed collision-free and complete entry of the sheet into a storage compartment sure. Because the leaves due to slippage in the transport system or not always in synchronism due to different sheet formats run into the stacker wheel at an interval, the problem arises exact entry control regardless of whether the stacker wheel is intermittent or rotates continuously. In both cases it is necessary to use an asynchronous To synchronize the sheet feeder and the rotating stacker wheel that each sheet is completely and collision-free in a storage compartment of the stacker wheel is handed over.

DE 27 56 223 C2 proposes a more constant, given Rotation speed of the stacker wheel the deviation of the individual Determine the sheet from its ideal position using a sensor and the leading edge of the sheet with a finger at the moment of Handing over the sheet by an amount proportional to the determined deviation to push down so far that the leading edge of the sheet is at the ideal sheet entry point enters the storage compartment. The quantitative measurement of the position deviation takes place at a distance in front of the transfer point, so sufficient Time to influence the leading edge of the sheet by individual Deflecting the finger is available.

In GB 2 168 687 A and EP 0 082 195 B1 instead of influencing suggested positioning the stacker wheel on the leading edge of the sheet to influence by first approaching the leading edge of the sheet Sheet detected at a certain distance in front of the transfer point and then the walking speed of the stacker wheel is dependent is briefly influenced by the transport speed of the sheet, that the sheet leading edge in the ideal entry point in a storage compartment of the Forklift wheels arrives.

A disadvantage of the last-mentioned solution proposal is that with closely following one another Scroll very high accelerations of the forklift wheel are necessary to get the next storage compartment into the ideal entry position in good time bring to. Another disadvantage arises in connection with overlapping sheets, which is particularly important when processing used banknotes can occur due to their poor condition.

In such cases, the back sheet is likely to fail completely gripped and thrown out of the stacker wheel.

The object of the present invention is therefore a sheet material stacking device as well as a method for controlling the entry of sheet material into storage compartments to provide a stacker wheel, the stacker wheel so is influenced that even with very short leaf spacing or overlapping A defined stacking is enabled.

According to the invention, this object is achieved by a method and a sheet material stacking device with the features of the independent claims solved. Advantageous embodiments of the invention are in it dependent claims specified.

While the approach of a sheet leading edge is determined in the prior art and was evaluated to take measures based on the data determined that are suitable for collision-free running in of the To ensure sheet in a storage compartment, the invention also provides that a group or groups of at least two sheets are sensed and can be evaluated, and that based on the evaluation result measures are taken for this group or groups of leaves, which are capable of a reliable handover of all sheets of this Ensure group in the storage compartments of the stacker wheel. By the Evaluation not only the next approaching sheet but at least the next two sheets approaching, it becomes possible anticipating the entry of the sheets into the stacker wheel for the whole Control group of leaves. In particular, the kinematics of the stacker wheel be influenced in a forward-looking manner, with the influence on the location and / or speed and / or acceleration of the Stacker wheels can relate.

For this purpose, a sheet material sensor is provided which has one or more Determines information about the approaching sheet material, for example the Distance between two sheets, the length of a sheet or the total length several overlapping sheets, the total thickness of several itself overlapping sheets, or other information, which conclusions allow the relative location of two or more sheets.

The sheet material sensor is expediently at a sufficient distance arranged in front of the stacker wheel so that the information about the following Sheet evaluated relative to the previous sheet and a corresponding one Influence on the forklift wheel can be made, before running the leading sheet into a storage compartment of the stacker wheel starts. The distance between the stacker wheel and the sheet material sensor should be therefore correspond to a length that results from the maximum length of the editing sheets, the normal distance between the sheets and an additional route, the additional route depending of the transport speed is such that it is sufficient Time to evaluate the sheet material sensor information and suitable Influencing the individual leaf flow is available.

A preferred embodiment of the invention provides for distance measurement between two sheets and the total length measurement of the sheets or to combine overlapping sheets. This is in easily possible with a single sheet sensor, for example can be designed as a light barrier and preferably located in the distance to the stacker wheel described above. By means of the light barrier the presence of sheet material in the transport path can be easily determine. The period of time between two consecutive serves Scrolling passes as a measure of the distance between the sheets and the time that elapses between the distance measurement as Measure of the length of a sheet or group of sheets. If that determined distance and / or length in an impermissible manner from one predefined threshold value deviates from a predefined, with the sheet material singling rate synchronized movement of the stacker wheel deliberately deviated and on the stacker wheel according to the individual determined leaf flow influenced by the stacker wheel either accelerated, braked or stopped, or only with very little Speed rotates.

Depending on the type of irregularity found, the following are examples Measures conceivable: If a distance between two sheets is found, which is below a minimum distance, the truck wheel can stop for a short time or rotate at a very slow rotation speed, so that both sheets can enter a common storage compartment. alternative can temporarily increase the speed of rotation of the truck wheel to compensate for the shortened distance, so that the two leaves enter separate storage compartments.

If the determined distance exceeds a predetermined maximum distance, So it makes sense to brake the truck wheel briefly in order to enlarge it Distance to be taken into account, so that both sheets reliably in each other separate storage compartments.

Exceeds the determined length of a sheet or group of itself overlapping sheets a predetermined maximum length, the stacker wheel stopped or rotating at a slow speed or at least be slowed down to the extent that all leaves of this group completely picked up by sheets in a common storage compartment become. If not before this sheet group has entered the storage compartment it is determined that the next sheet or the next sheet group follows with a sufficient distance, the stacker wheel makes sense stopped so that the next sheet or the next one Sheet group can enter the same stacker compartment. Only when on again sufficiently large distance is determined, the stacker wheel on the next storage compartment positioned and, if necessary, again from the individual Leaf flow control on the synchronized control (synchronization the stacker wheel rotation speed with the sheet separation rate) changed.

In the event that a group of overlapping sheets with a Thickness sensor is determined, it makes sense to stop the stacker wheel, because a statement about the total length of the overlapping Leaves and thus a statement of the length of time the leaves take to shrink in the storage compartment, is not easily possible. The The stacker wheel is only positioned on the next storage compartment when again a sufficient distance between two sheets or sheet groups is detected.

However, in addition to the total thickness, the total length of the overlapping sheets determined and evaluated, so it can be determined exactly at which point the overlap begins and ends. Under these conditions it is possible to accelerate by short-term acceleration the stacker wheel separates the overlapping sheets in this way to ensure that the sheets run into separate storage compartments. However, it must be ensured that the acceleration is not too violent and speeds of the stacker wheel breaking in Prevent leaves or cause them to be ejected.

For most of the aforementioned embodiments, it makes sense to use one Speed sensor for determining the speed of sheet transport to provide the storage compartments of the stacker wheel depending on the The time remaining to transport the sheet material to the stacker wheel, to be able to position in time. Furthermore, the transport speed in influencing the kinematics of the stacker wheel in such a way be considered that the shrinking of a leaf or a group of sheets in a storage bin is just completed before the next one Sheet or the next group of sheets in the next tray enters.

The stacker wheel advantageously rotates at single or multiple synchronous speeds, the synchronous speed v _s resulting from the nominal singling rate r _N (sheets per minute) and the number n _F of storage compartments per revolution. A multiple synchronous speed means that in nominal operation of the machine, ie with synchronized singling rate and stacker wheel speed, not every compartment of the stacker wheel is occupied with a sheet. This reduces the risk that successive sheets interfere with stacking if they collide with kinks or folds. When a group of sheets with small spacing arrives, each storage compartment can be specifically assigned one sheet in order to reduce the duration of the positioning of the stacker wheel on the next desired storage compartment.

A special embodiment of the invention provides that in addition to or instead of influencing the kinematics of the stacker wheel Sheet material speed in at least a partial area of the sheet material transport route is affected to irregularly spaced leaves or themselves bring overlapping sheets to a normalized distance so that the Shrinkage of a sheet more often becomes possible for each storage compartment. This is a Transport system provided which has at least one transport route segment has, whose transport speed depends on the sheet material sensor information can be influenced.

According to a further special embodiment of the invention in addition to or instead of influencing the kinematics of the stacker wheel an influence on the leaves by means of one or more control fingers take place, as is basically the case mentioned in the introduction DE 27 56 223 C2 the disclosure content of which is explicitly referred to here is taken.

In the following, the invention is exemplified with reference to the accompanying Described drawings.

Where:

Fig. 1

shows a spiral stacker according to the present invention;

Fig. 2

shows the principle of distance measurement;

Fig. 3

shows the principle of total length measurement; and

Fig. 4

shows the principle of total thickness measurement.

The overall view of a spiral stacker shown schematically in FIG. 1 shows a stacker wheel 1 with a number distributed spirally over the circumference Storage compartments 2, which are formed by partitions 20. The stacker wheel 1 rotates in the direction of arrow 10 and takes sheets 7A, 7B, which over a in Direction of arrow 11 driven transport system 5 are fed into the Storage compartments 2 and transports the sheets in the circumferential direction of the Stacker wheel 1 until it is finally removed from the storage compartments by a scraper 4 2 are pulled and fall onto a stack 3. The spirally curved Partitions take on the function of the transported Sheets 7A, 7B to be braked continuously.

In the case of a continuously driven stacker wheel 1, it is important that the sheet 7A at the optimal entry point 15 in the storage compartment 2nd runs in, so that the sheet 7A has completely run into the storage compartment 2, before the lower partition 20 of the storage compartment 2 enters the entry point 15 passes.

In normal operation, the rotation of the stacker wheel 1, regardless of whether the stacker wheel 1 rotates intermittently or continuously, is synchronized with the singling rate and rotates with the synchronous speed v _S , which results from the nominal singling rate r _N , ie the number of sheets separated per minute, and the number n _{F of} the storage compartments 2 evenly distributed over the circumference of the stacker wheel 1 as: v S = r N / n F ,

The stacker wheel preferably rotates at a multiple of the synchronous speed appropriate speed.

A sheet material sensor 16 is arranged at a greater distance from the stacker wheel 1. The sheet material sensor 16 is designed as a light barrier and detects this The presence or absence of sheet material in the transport system 5. Between the sheet material sensor 16 and the stacker wheel 1 is near the Stacker wheels 1 arranged a proximity sensor 6, which is also a light barrier is formed and serves the leading edge of an approaching Detect sheet 7A. On this proximity sensor 6 can under In particular, circumstances are waived, as will be explained below if a sheet transport speed sensor 17 is provided is.

With a synchronized separation of similar leaves without any irregularities (distance variations or overlapping of leaves), a synchronized cycle length t _{0 of} successive leaves 7A, 7B results, which is inversely proportional to the separation rate v _N and is composed of a time span t _L (standard length), this is the time it takes a sheet to be transported over any point of the transport system and a time period t _a (synchronized distance) that passes between two successive sheets 7A, 7B.

Both the synchronized distance t _a and the standard length t _L are determined with the sheet material sensor 16.

The distance between the proximity sensor 6 and the sheet material sensor 16 is selected to be greater than the synchronized cycle length t ₀ , so that at the point in time when the leading sheet 7A reaches the proximity sensor 6, an evaluation device 18 already evaluates the information supplied by the sheet material sensor 16 is and is certain whether the synchronized cycle length t ₀ between the two successive sheets 7A, 7B lies within predetermined tolerance limits or whether there is an impermissible irregularity, for example in the distance between the two sheets or in the total length of a sheet or a group of sheets. At the moment when the proximity sensor 6 detects the arrival of a sheet 7A, information about the position of the next sheet 7B is already available, so that the kinematics of the stacker wheel 1 can be influenced in a manner coordinated with the individual, asynchronous sheet flow. In the simplest case, the stacker wheel 1 is stopped to allow incoming overlapping sheets or sheets with a short distance between successive sheets to enter a common storage compartment 2, and only when the distance between two successive sheets 7A, 7B is above a minimum distance brought the next storage compartment 2 of the stacker wheel 1 into the run-in position. A position sensor 14 provides information about the exact positioning of the stacker wheel, which detects the stacker wheel position on the basis of a contact disk 13 and forwards it to the evaluation unit 18. If the position sensor 14 has only a resolution which corresponds to the number of storage compartments 2 or the dividing walls 20, a higher resolution can be achieved by evaluating information from the drive of the stacker wheel 1 in addition to the position sensor 14. If the drive is formed by a stepper motor, the steps taken by the stepper motor can be counted, for example. Since it is known how many steps there are between two partitions 20 or storage compartments 2, the exact position can thus be determined.

The detection of various irregularities and the measures to be taken thereon will now be described in more detail with reference to FIGS. A section of the transport path of the sheet material 7 in the direction of the arrow is shown schematically, the sheets 7A, 7B and 7A, 7B, 7C each defining a group of sheets whose relative position to one another is determined and evaluated by means of the sheet material sensor 16, to suitably influence the kinematics, ie the position, the speed or the acceleration, of the stacker wheel 1 on the basis of the evaluation result. Here, t ₀ denotes the synchronized cycle length, that is to say the distance between two successive sheets in synchronized operation without irregularities occurring, which is composed of the synchronized distance t _a and the length t _{L of} the sheet material to be processed, as previously explained.

Fig. 2 shows the case of an irregularity in the distance between the sheets 7A, 7B. The actual distance t ' _a between the leaves 7A, 7B of this group of leaves is smaller than the synchronized distance t _a . If no measures are taken, this can result in the trailing sheet 7B still running with its front sheet edge into the storage compartment 2, in which the leading sheet 7A has already been received, so that the trailing sheet 7B collides with the partition 20. By the proximity sensor 6 determining the arrival of the leading sheet 7A at a point in time at which the irregularity of the sheet spacing has already been recognized and evaluated, a suitable measure can be taken to prevent this collision.

For example, the singling wheel 1 can be stopped so that all incoming sheets 7A, 7B, ... can be received in a common storage compartment 2 until the sheet material sensor 16 has a sufficiently large distance t ' _a ≥ t _a to a subsequent sheet 7C or a subsequent one Group of sheets reports that the stacking wheel continues to cycle. On the other hand, if the speed sensor 17 provides information about the sheet material transport speed and is taken into account when influencing the kinematics of the stacker wheel 1, it is also possible to specifically influence the rotational speed of the stacker wheel 1 in such a way that the trailing sheet 7B enters the next desired storage compartment 2 enters. For this purpose, the stacker wheel 1 only has to be briefly accelerated or prepositioned by a corresponding amount. Conversely, if the distance t ' _a between the sheets 7A and 7B of the group of sheets 7A, 7B is greater than the synchronized distance t _a , the stacker wheel 1 only has to be braked by a corresponding amount in order to ensure that the lagging sheet 7B does not collide to reach the next desired storage compartment.

Instead of stopping the stacker wheel 1 completely, this can also be slow be moved so that the stacker wheel 1 during the period of The sheets 7A, 7B only run in by a fraction of the storage compartment 2 moved on.

3 shows the case in which the sheet material sensor 16 determines an overall length t _{L of} the sheet or of the group of sheets 7A, 7B, 7C which is above the standard length t _L. At the time when the approach of the leading sheet 7A is reported by the proximity sensor 6, it is already clear that a measure must be taken that a group of overlapping sheets 7A, 7B, ... must be shrunk.

This measure can in turn consist in stopping the stacker wheel 1 or moving it at a low speed until all the sheets in this group of sheets are accommodated in the same storage compartment 2, ie until the sheet material sensor 16 reports a distance t ' _a between two successive sheets which is larger or larger is equal to the synchronized distance t _a . In other words, if the sheets 7A, 7B, 7C are followed by a further sheet, the distance t ' _{a of which is} comparatively small, measures are taken to influence the stacker wheel, as described in connection with FIG. 2.

FIG. 4 shows a case in which the sheet material sensor 16 is (at least also) designed as a thickness sensor. That is, the sheet material sensor 16 determines on the basis of the actually determined thickness d 'of the sheet material whether there is an impermissible deviation from the predetermined sheet material thickness d ₀ and, in the positive case, concludes that a group of sheets 7A, 7B overlap. As a measure thereupon, the same measures come into consideration as were explained in connection with FIG. 3, where also overlapping sheets were determined (however on the basis of the determination of the total length t ' _L ).

The sheet material sensor 16 designed as a thickness sensor can also be used as a light barrier be formed, however, the intensity of the leaf material light shining through is measured. This allows you to use a single sensor both the leading edge of the leading sheet 7A (simple Light barrier) as well as the front edge of the following sheet 7B and the trailing edge of the leading sheet 7A (intensity measurement) determine their exact location. This enables the stacker wheel 1 taking into account the sheet material transport speed accelerate that the sheets 7A and 7B enter separate storage compartments 2. That is, the information is also in this particular embodiment of the sheet transport speed of interest, for example can be determined by means of the speed sensor 17 by the Rotational speed of a transport wheel is determined.

The proximity sensor 6 can also be dispensed with, since it is only the Provides information that sheet material 7 is approaching stacker wheel 1, in order to get the sheet material into a storage compartment 2 in time necessary measures to influence the kinematics of the stacker wheel 1 to be able to meet. But is the speed of sheet transport, for example through the speed sensor 17, known, the range is sufficient Sheet material sensor 16 for determining the point in time at which the sheet material will hit the stacker wheel 1. Because this time comes in easily determined from the quotient of the sheet material sensor distance Transport speed.

Taking the transport speed into account when determining the Influencing measures on the kinematics of the stacker wheel can be advantageous can also be used to control the movement of the stacker wheel to adjust the time available for shrinking the next sheet so that the positioning of the stacker wheel until the next one arrives Sheet is just completed.

1 sees as additional or separate Measure before that the transport system 5 is a transport route segment 12A, 12B, the transport speed of which can be influenced. Depending on, which arrangement of the sheets 7A, 7B of a group of sheets 7A, 7B is determined by the sheet material sensor 16, the speed of the Transport route segments 12A, 12B controlled. Gaps within groups of leaves can be varied on the synchronized distance and overlapping sheets can be pulled apart. This makes stacking from one sheet per storage compartment possible more often.

As a further additional or separate measure, a control finger is shown in FIG. 1 8, which is transported in the direction of arrow 9 vertically from above onto the Leaf material acts and with which it is therefore possible, the leaf material to press downwards relative to the transport direction, for example in In the case of rapidly successive sheets, the trailing sheet 7B to the next to deflect the desired storage compartment 2, even if this storage compartment has not yet reached the actual entry position at this point.

With the help of the latter two measures, d. H. the individual Control of the sheet material transport speed in a transport segment and / or deflecting the sheet material at the transfer point to the stacker wheel 1 by means of one or more control fingers 8, it is also possible to control the sheet feed in the storage compartments 2 of the stacker wheel 1, without necessarily influencing the fork wheel kinematics got to. In both cases, however, it is advantageous to take the respective measure based on information taken from a group of sheets 7A, 7B, ... are derived so that a predictive influence on the System is possible.

It is evident that from the described control of the intake of Sheet material in a stacking device by evaluating a group of at least two sheets must always be deviated if not there are at least two sheets for evaluation, such as this is the case for the entry of the first sheet.

The invention not only enables irregularities to occur from synchronized operation to individual leaf flow control switch, but is also particularly suitable for constantly in mode the individual leaf flow control to work when, for example Sheet material of various formats must be stacked.

It is also possible to load the sheet material in the transport system and / or in the spiral stacker both along its long side and along its short Transport and / or file page.

It is also possible that the truck is constructed according to a concept which deviates from the described spiral stacker, in which the sheet material but are still handed over to the truck at defined times must to ensure safe and good storage in the truck. On such a stacker can have, for example, a rotating drum, which has openings on its surface at certain intervals, which with are under a negative pressure. Others periodically, continuously or intermittently operated stacking devices, for example as patchers can be formed, are also possible if as with rotating Stacker statements can be made about the times at which the sheet material is picked up by the stacking devices to the to enable described control.

Claims (24)

Method for controlling the entry of sheet material (7) into a stacker (1, 2), in particular into storage compartments (2) of a continuously or intermittently rotating stacker wheel (1), in which the presence of sheet material at a defined distance in front of the stacker ( 1, 2) is sensed and evaluated and the kinematics of the stacker (1, 2) is influenced as a function of the evaluation result, characterized in that when evaluating a group of at least two sheets (7A, 7B, 70) of the sheet material (7 ) is taken into account and the kinematics of the stacker (1, 2) is influenced as a function of the evaluation result for this group of sheets (7A, 7B, 70). Method according to Claim 1, characterized in that a switchover from a synchronized feed control, in which the sheet material speed is in a defined ratio to the rotational speed of the stacker wheel (1), to an individual sheet flow control, in which the kinematics of the stacker wheel (1) for each sheet or each group of leaves (7A, 7B, 70) is controlled individually if the evaluation result for the group of leaves shows irregularities in the leaf flow. Method according to claim 1 or 2, characterized in that the sensory detection of the sheet material (7) takes place at a distance in front of the stacker wheel (1) which is greater than the length or width of the largest sheet to be stacked. Method according to one of claims 1 to 3, characterized in that the sensory detection of the sheet material (7) is used to determine the distance (ta ') between two successive sheets (7A, 7B). Method according to Claim 4, characterized in that the stacker wheel (1) is braked or stopped or rotates at a very slow speed if the distance (ta ') is smaller than a predetermined distance (ta) so that both blades (7A, 7B ) enter a common storage compartment (2). Method according to claim 4, characterized in that the stacker wheel (1) is accelerated when the distance (ta ') is smaller than a predetermined distance (ta) so that both sheets (7A, 7B) enter separate storage compartments (2) , Method according to one of Claims 1 to 6, characterized in that the sensory detection of the sheet material (7) is used to determine the total length (tL ') of overlapping sheets (7A, 7B). Method according to claim 7, characterized in that the stacker wheel (1) is braked or stopped or rotates at a very slow speed if the total length (tL ') is greater than a predetermined length (tL), so that all the sheets (7A, 7B , 7C) of the group of sheets enter a common storage compartment (2). Method according to claim 7, characterized in that the stacker wheel (1) is accelerated if the total length (tL ') is greater than a predetermined length (tL), so that all or individual sheets (7A, 7B, 7C) of the group of Feed the leaves into separate storage compartments (2). Method according to one of claims 1 to 9, characterized in that the sensory detection of the sheet material (7) is used to determine the total thickness (d ') of overlapping sheets (7A, 7B). Method according to Claim 10, characterized in that the stacker wheel (1) is braked or stopped or rotates at a very low speed if the total thickness (d ') is greater than a predetermined minimum thickness d, so that both sheets (7A, 7B) in enter a common storage compartment (2). Method according to one of Claims 1 to 11, characterized in that the sheet material speed is taken into account when influencing the rotational speed of the stacker wheel (1) in such a way that the entry of a sheet or a group of sheets into a storage compartment (2) has just been completed before run the next sheet or the next group of sheets into the next storage compartment (2). Method according to one of claims 2 to 12, characterized in that the stacker wheel (1) rotates with synchronized inlet control at a synchronous speed v _S = r _N / n _F , where r _{N is} the nominal singling rate in sheets per minute and n _{F is} the number of storage compartments denote per revolution of the truck wheel. Method according to one of claims 2 to 12, characterized in that the stacker wheel (1) rotates with synchronized run-in control with an integer multiple of the synchronous speed v _S = r _N / n _F , where r _{N is} the nominal singling rate in sheets per minute and n _F the Indicate the number of storage compartments per revolution of the stacker wheel. Method according to one of claims 1 to 14, characterized in that the sheet material speed is influenced in at least one partial area (12a) of the sheet material transport route depending on the evaluation result. Method according to one of claims 1 to 15, characterized in that the sheet material (7) is deflected perpendicularly to the sheet material transport direction immediately before entering a storage compartment (5) of the stacker wheel (1) by means of one or more control fingers (8) depending on the evaluation result. in order to influence the entry point (15) at which the sheet material (7) runs into the storage compartment (5). Sheet goods stacking device, in particular spiral stackers, comprising: a stacking device (1) for receiving sheet material (7) in the form of individual sheets or a group of sheets (7A, 7B, 7C) and with a periodic, continuous or intermittent drive, a transport system (5) for feeding sheet material (7) to the stacking device (1), a sheet material sensor (16) for detecting the presence of sheet material (7) in the transport system at a defined distance from the stacking device (1), an evaluation device (18) for evaluating the sheet material sensor data and A control device (18) for influencing the kinematics of the drive of the stacking device (1) depending on the evaluation result, characterized in that sheet material sensor data of a group of at least two sheets (7A, 7B, 7C) are taken into account in each evaluation result. Sheet goods stacking device according to claim 17, characterized in that the distance to the stacking device (1) is greater than the length or width of the largest sheet to be stacked. Sheet material stacking device according to claim 17 or 18, characterized in that the sheet material sensor (16) is designed as a light barrier. Sheet goods stacking device according to one of claims 17 to 19, characterized in that a transport speed sensor (17) is provided. Sheet material stacking device according to one of claims 17 to 20, characterized in that the sheet material sensor (16) is a sheet material thickness sensor. Sheet material stacking device according to one of claims 17 to 21, characterized in that a proximity sensor (6) is provided between the sheet material sensor (16) and the stacking device (1). Sheet goods stacking device according to one of claims 17 to 22, characterized in that the transport system (5) has at least one transport path segment (12a, 12b), the transport speed of which can be influenced as a function of the evaluation result. Sheet material stacking device according to one of claims 17 to 23, characterized in that one or more control fingers (8) are provided which, depending on the evaluation result, the sheet material (7) immediately before entering a storage compartment (2) of the stacking device (1) perpendicular to the sheet material transport direction distracted.

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