Vibrating table for vibrating stacked material in the form of layers of sheets

Abstract

The invention relates to a vibrating table (1) for vibrating material (2) in the form of layers of sheets, for example stacked printed sheets. The vibrating table (1) has: - a tiltable supporting table (4), wherein the supporting table (4) has a vibrating plate with a supporting surface (5) for placing the stacked material (2), a rear limit stop (6) for the placed stacked material (2) and at least one lateral limit stop (7) for the placed stacked material (2), wherein the supporting table (5) is tiltable from a horizontal position in the direction of the two limit stops (6, 7), - a vibrating means, which is configured to set the vibrating plate of the supporting table (4) in vibrating motion, - a front blowing means (13), - and a rear counter-blowing means.

Description

[0001] Vibrating table for vibrating stacked goods in sheet layers

[0002] Description

[0003] The invention relates to a vibrating table for vibrating material in sheet layers, for example stacked printed sheets.

[0004] Vibrating tables typically have an inclinable support table. The support table includes a vibrating plate with a support surface for placing the stacked goods, a rear stop for the stacked goods placed thereon, and at least one lateral stop for the stacked goods placed thereon. The support table can be tilted from a horizontal position toward the two stops. Furthermore, a vibrating table includes a vibrating device designed to set the vibrating plate of the support table in a vibrating motion. The inclination of the support table and the vibrating motion of the vibrating plate ensure that the individual sheet layers or sheets are precisely aligned with the stops.To prevent unwanted displacement of the stacked, aligned goods after vibration, the stacked goods are usually clamped between the vibrating plate and the clamping device using a clamping device, and the air is spread out between the individual layers of the stacked goods using a movable air spreader. After venting, the stack or stacked goods forms a compact block and can thus be fed, for example, to a downstream cutting station. To improve the vibration result and thus the alignment of the stacked goods, it is generally known to blow air between the layers of the stacked goods with the aid of blowing devices in order to facilitate the displacement of the individual layers of sheets relative to one another. A vibrating table with blowing devices is described, for example, in DE 43 07 361 A1.

[0005] The object of the present invention is to further develop a vibrating table in such a way that it ensures fast, edge-accurate alignment of the material to be vibrated, even with large sheet layers, high weight and / or low grammage.

[0006] This object is achieved by a vibrating table having the features of claim 1. Advantageous further developments are the subject of the dependent claims.

[0007] The vibrating table according to the invention is used for vibrating stacked material in sheet layers, in particular stacked printed sheets. The vibrating table has at least the following components: a tiltable support table, wherein the support table has a vibrating plate with a support surface for placing the stacked material, a rear stop for the stacked material placed thereon, and at least one lateral stop for the stacked material placed thereon, wherein the support table is tiltable from a horizontal position in the direction of the two stops, a vibrating device configured to set the vibrating plate of the support table in a vibrating motion, a front blowing device, wherein the front blowing device has one or more slotted nozzles arranged next to one another in the width direction of the stacked material for discharging air, wherein the one or more slotted nozzles are configured toto blow air from a front edge of the stacked goods facing away from the rear stop between the sheet layers of the stacked goods in the direction of a rear edge of the stacked goods resting against the rear stop, wherein the slot opening of the respective slot nozzle extends in the width direction, wherein the one or more slot nozzles, in particular together, are movable in a vertical direction running perpendicular to the support surface, thus in the stacking direction of the stacked goods, a rear counter-blowing device, wherein the rear counter-blowing device has a plurality of air nozzles for discharging air, wherein the plurality of air nozzles are arranged spaced apart from one another in the width direction of the stacked goods in the region of the rear stop and are configured to blow air from the rear edge of the stacked goods between the sheet layers of the stacked goods in the direction of the front edge of the stacked goods.

[0008] In an embodiment with a plurality of slot nozzles, the plurality of slot nozzles can be movable together and / or independently of one another in the vertical direction.

[0009] In this respect, the vibrating table according to the invention is provided with two opposing blowing devices, each of which blows air into the stacked goods in the direction of the other blowing device.

[0010] In practice it has been shown that blowing air from opposite sides of the stacked goods has a beneficial effect on the precise edge alignment of the individual sheet layers during the jogging process. The idea is that during the jogging process air is blown into the stacked goods from both the rear edge and the front edge. The front edge, which is therefore free of any stops, is exposed to blown air using one or more slot nozzles. Blowing air from the front edge has the advantage that the stacked goods can be exposed to blown air over a large width, basically across the entire width of the front edge, since there are no stops there to prevent or hinder the injection of air. This makes it possible to blow air into the stacked goods along the front edge across the entire width and thus between the sheet layers.It is provided that during the jogging process the one slot nozzle or the several slot nozzles, in particular together, are moved in the vertical direction, thus perpendicular to the support surface or perpendicular to the stacking direction of the stacked goods, which has proven to be particularly advantageous with regard to an accurate and rapid alignment of the sheet layers during the jogging process.

[0011] While the leading edge is exposed to air blast across its entire width, if possible, or at least across a large portion of the entire width, thus at least 50% of the entire width, by means of the front injection device, this is not necessary in the area of ​​the trailing edge. Rather, it has proven particularly advantageous if air is injected only locally in the area of ​​the trailing edge, i.e., in individual areas spaced apart in the width direction, using the air nozzles of the counter-blowing device spaced apart in the width direction.

[0012] It has proven particularly advantageous if the amount of air blown in or the volume flows of the counter-blowing device and the injection device are significantly different, in particular an air flow of the air blown in by the injection device is at least twice as large as an air flow blown in by the counter-blowing device.

[0013] Furthermore, it has proven particularly advantageous if the one or more slot nozzles are arranged in such a way that a closed or substantially closed, flat air board is blown into the sheet layers in the region of the leading edge, which extends over at least 50%, preferably over at least 60%, in particular over at least 90% of the width of the stacked goods.

[0014] It is considered particularly advantageous if the one or more slot nozzles cover a distance in the width direction which corresponds to at least 50% of the width of the support table.

[0015] The injection device preferably has at least four, preferably at least six, in particular at least seven individual slot nozzles. It is considered particularly advantageous if these slot nozzles are arranged such that the slot nozzles adjoin one another without gaps or almost without gaps in the width direction.

[0016] The air nozzles of the counter-blowing device are preferably designed as additional slot nozzles, with a further slot opening of the respective additional slot nozzle extending in the width direction. The cross-section of the respective additional slot opening in the vertical direction is preferably 90% to 120% of the cross-section of the respective slot opening of the slot nozzles of the injection device in the vertical direction.

[0017] It has proven particularly advantageous if the additional slot nozzles are arranged such that a closed or substantially closed, flat air board is blown into the sheet layers in the region of the trailing edge, extending over at least 20%, preferably over at least 30%, in particular over at least 50% of the width of the stacked goods. Preferably, the air board extends over a maximum of 80% of the width of the stacked goods.

[0018] It is considered particularly advantageous if the air nozzles of the counter-blowing device occupy at least 20% of the width of the support table, preferably at least 30% of the width of the support table, in particular at least 50% of the width of the support table. It has been shown that with such a design, a particularly good vibration result can be achieved in a short time. Preferably, the air nozzles of the counter-blowing device occupy a maximum of 80% of the width of the support table.

[0019] While the nozzles of the injection device are slot nozzles, this is not mandatory for the nozzles of the counter-blowing device. In a further embodiment, it is considered advantageous if the air nozzles of the counter-blowing device have a round, particularly circular, outlet cross-section. Preferably, the cross-sections of the air nozzles in the vertical direction are 90% to 120% of the cross-sections of the slot openings of the slot nozzles in the vertical direction.

[0020] In connection with the term “nozzle”, it should be noted that a nozzle does not necessarily, but preferably, have a cross-sectional constriction.

[0021] It is considered particularly advantageous if the counter-blowing device has at least four, preferably at least five, in particular at least six air nozzles. It is considered particularly advantageous if the counter-blowing device has a maximum of ten air nozzles.

[0022] Depending on the stack height and grammage, it has proven advantageous and sufficient if the air nozzles of the counter-blowing device occupy a maximum of 10% of the width of the support table, in particular if the air nozzles of the counter-blowing device have a round, in particular circular, outlet cross-section.

[0023] In particular, if the air nozzles of the counter-blowing device are designed as additional slot nozzles, it is considered advantageous if the air nozzles of the counter-blowing device occupy at least 30% of the width of the support table, preferably at least 40% of the width of the support table.

[0024] In a particularly preferred embodiment, the injection device comprises a first blower device for supplying the slot nozzles of the injection device with air, and the counter-blowing device comprises a second blower device, operating independently of the first blower device, for supplying the air nozzles of the counter-blowing device with air. This makes it easy to vary the air quantity or the volume flows emitted by the nozzles of the counter-blowing device and those emitted by the nozzles of the injection device independently of one another. This allows adaptation to the properties of the stacked goods to be vibrated, for example with regard to the dimensions of the stacked goods, the weight of the stacked goods, and / or the grammage of the sheet layers of the stacked goods.

[0025] It is considered particularly advantageous if the vibrating table has a control device for controlling the injection device and the counter-blowing device. It has proven advantageous if the control device is designed to control the first blower device and the second blower device in such a way that the injection device outputs a volume flow V_In and the counter-blowing device outputs a counter-volume flow V_Counter, wherein a ratio of the volume flow to the counter-volume flow (V_In / V_Counter) is 1.5 to 2.5. This ensures that the sheet layers float well during the vibrating process, particularly with large formats, whereby a good vibrating result can be achieved in a short time.

[0026] However, it is also conceivable that the control device is designed to control the first blower device and the second blower device in such a way that the injection device outputs a volume flow V_In and the counter-blowing device outputs a counter-volume flow V_Counter, wherein a ratio of the volume flow to the counter-volume flow (V_In / V_Counter) is at least 1.8, in particular at least 3.0.

[0027] It is considered particularly advantageous if the air nozzles of the counter-blowing device are vertically movable. In this context, it is considered particularly advantageous if the air nozzles of the counter-blowing device are less vertically movable than the one or more slot nozzles of the injection device.

[0028] It is considered particularly advantageous if the air nozzles and the slot nozzles are designed to move in the vertical direction, in particular back and forth, during the vibrating process.

[0029] With regard to the air nozzles of the counter-blowing device, it is considered particularly advantageous if the air nozzles are formed in a lower region of the rear stop with respect to the vertical direction.

[0030] In a particularly preferred embodiment, the rear stop has through-openings and / or through-slots extending vertically, with the air nozzles being movable along the through-openings and / or through-slots. It is certainly conceivable for the nozzles to extend through the through-slots. The design with through-slots has the advantage that injected air can also escape through the through-openings and / or through-slots, thus preventing air buildup in these areas.

[0031] It is considered particularly advantageous if the slot nozzles and the air nozzles are in the same plane during the process.

[0032] In a preferred embodiment, the vibrating table comprises a gantry frame connected to the tiltable receiving table, wherein the one or more slotted nozzles are mounted in the gantry frame for vertical movement. The one or more slotted nozzles can be mounted in the gantry frame jointly and / or individually, preferably independently, for vertical movement.

[0033] It is considered particularly advantageous if the portal frame can be moved parallel to the support surface in a longitudinal direction perpendicular to the rear stop toward the rear stop. This allows for easy adjustment of the distance of one or more slotted nozzles from the rear stop to achieve optimal adaptation to different formats of the sheet layers of the stacked material.

[0034] It is considered advantageous if the portal frame has a first linear guide extending in the vertical direction, wherein the one slot nozzle or the several slot nozzles, in particular together, are mounted so as to be movable in the first linear guide.

[0035] It is considered particularly advantageous if a hold-down plate that can be moved perpendicular to the support surface and aligned parallel to the support surface is mounted in the gantry frame. The hold-down plate prevents the topmost sheet layer or layers from being deflected too far or even completely detaching from the rest of the stacked goods due to the relatively large amount of air or strong air flow from the slot nozzles of the injection device. The hold-down plate therefore serves to secure and maintain the stacked shape of the stacked goods. It is certainly conceivable that the hold-down plate is arranged at a distance from the topmost sheet layer to allow the sheet layers to float up. In particular, the hold-down plate should not press on the topmost sheet layer or press the stacked goods against the support table, since otherwise the floating required for alignment would not be possible.

[0036] Preferably, the hold-down plate is fixed to the portal frame with respect to its widthwise orientation. This design is particularly simple and straightforward to achieve. Practice has shown that, regardless of whether the support table is tilted toward a left-hand stop or a right-hand stop, a fixed hold-down plate is sufficient to achieve the desired effect. Adjusting the hold-down plate has proven to be unnecessary.

[0037] The hold-down plate is preferably a cut-to-size plate made of cardboard or plastic with a magnetizable or magnetic coating and is magnetically attached to a support element connected to the portal frame and movable in the vertical direction. This design has the advantage that, by appropriately cutting the plate, it can be easily adapted to the format of the stack to be jogged. The plate is preferably cut to completely or almost completely cover the format of the sheets in the stack to be jogged.

[0038] In one embodiment, a plurality of front hold-down elements are mounted in the portal frame, wherein the front hold-down elements are arranged next to one another in the width direction, wherein the plurality of front hold-down elements can be transferred independently of one another from an initial position to a hold-down position and vice versa, wherein the front hold-down element, in the hold-down position, limits the floating of the sheet layers in the vertical direction. In a manner analogous to the hold-down plate, this prevents the uppermost sheet layer(s) from being deflected excessively due to the relatively large air volume or strong air flow of the slot nozzles of the blowing device, or even from becoming completely detached from the remaining stacked goods.The respective hold-down element can be transferred from the starting position to the hold-down position, for example, by vertically moving and / or pivoting the front hold-down element. The provision of several independently movable front hold-down elements allows adaptation to the width of the stacked goods to be vibrated. Furthermore, transferring the front hold-down elements to the starting position facilitates feeding the stacked goods onto and / or removing them from the support table, particularly when a mechanical gripper is used for such a process.

[0039] In one embodiment, one or more rear hold-down elements are mounted in the rear stop, which limit the vertical floating of the blade layers in the region of the trailing edge. Particularly when the air nozzles are designed as slot nozzles, the provision of one or more rear hold-down elements has proven particularly advantageous. The respective rear hold-down element can be stationary with respect to the rear stop. However, it is also conceivable for the respective rear hold-down element to be movable.

[0040] It has proven particularly advantageous if the one or more slot nozzles are movable along the width direction and can be fixed in position in the width direction using a fixing device. This allows adaptation to the direction of inclination of the support table and thus to the position of the stacked goods during the vibrating process, since the width covered by the slot nozzles is generally smaller than the width of the support table. If the support table is tilted to the right during vibrating, the one or more slot nozzles are also moved to the right beforehand and then fixed in this position. If the support table is tilted to the left during vibrating, the one or more slot nozzles are also moved to the left beforehand and then fixed in this position.It is considered advantageous if the vibrating table has a linear guide extending in the width direction, wherein the one or more slotted nozzles, in particular together, are displaceably mounted in the linear guide and can be fixed in position in the width direction via a clamping device. The position can be fixed, for example, by clamping using a quick-action clamping device. The linear guide can be a rail guide, for example.

[0041] In one embodiment, the vibrating table comprises a drive motor configured to move the one or more slotted nozzles along the width direction, in particular to move the multiple slotted nozzles together along the width direction. This allows for adaptation to the inclination direction of the support table and thus to the position of the stacked goods during the vibrating process, since the width covered by the slotted nozzles is generally smaller than the width of the support table.

[0042] When using multiple slot nozzles, it has proven particularly advantageous if the multiple slot nozzles, especially together, are displaceable in the width direction. However, it is also entirely conceivable for the multiple slot nozzles to be displaceable independently of one another along the width direction, allowing the slot nozzles to be arranged further apart to cover a wider format, or closer together to cover a smaller format in the width direction.

[0043] When using multiple slot nozzles, it has proven particularly advantageous if, in one embodiment, at least one, preferably each, of the multiple slot nozzles can be moved vertically independently of the other slot nozzles from a parked position to a use position, wherein the parked position is located vertically above the use position. In the parked position, the slot nozzle is preferably positioned such that air emitted by the slot nozzle does not impinge on the front edge of the stacked goods, for example, by arranging the slot nozzle above the stacked goods in the parked position.This advantageously allows the injection device to be adapted to the dimensions of the stacked goods by moving those slot nozzles that would inject air along the width of the stacked goods and / or the inclination of the support table into the parking position, depending on the width of the stacked goods and / or the inclination of the support table, and thus preventing air from being injected into the front edge of the stacked goods. This is particularly advantageous when the independently movable slot nozzle is fluidically coupled to another of the multiple slot nozzles of the injection device, such that air can only be injected jointly through the movable slot nozzle and the other slot nozzle.If the movable slot nozzle is positioned outside the stacked goods in terms of the width of the stacked goods and would therefore blow past the stacked goods from the side, the movable slot nozzle can be moved into the parking position, whereby turbulence at the lateral edge of the stacked goods caused by air blown in there can be avoided, which could have a negative effect on the shaking process.

[0044] It is considered particularly advantageous if the injection device has one or more deflector plates, whereby the deflector plates cover the slot opening of the one or more slot nozzles in the parked position when the one or more slot nozzles are in the parked position. This prevents air from being blown towards the rear stop or onto the front edge of the stacked goods by a slot nozzle in the parked position. In addition, the deflector plate achieves a flow resistance in the area of ​​the slot nozzle in the parked position that is similar to that which would be the case if the slot nozzle were blowing onto stacked goods, for example in the use position. In terms of flow technology, the deflector plate essentially simulates the front edge of stacked goods in order to achieve a flow resistance that essentially corresponds to that of stacked goods.As a result, a similar dynamic pressure is achieved by the impact shield when the slot nozzle is in the parked position as with the fluidically coupled slot nozzle that blows onto the front edge of the material, whereby the volume flow through the respective slot nozzle of the fluidically coupled slot nozzles is approximately the same, regardless of whether one of the fluidically coupled slot nozzles is in the parked position and therefore does not blow onto the front edge of the stacked material.

[0045] The injection device preferably comprises a plurality of slot nozzles, wherein the injection device has a support bar extending in the width direction, wherein the slot nozzles are each detachably fastened to the support bar. This allows quick and easy adjustment of the injection device to the width format of the stacked goods. With a larger width format, a larger number of slot nozzles is used than with a smaller width format. With a fixed number of slot nozzles, the problem arises that with a smaller width format, air flows laterally past the stacked goods, which has a detrimental effect on the vibrating result. In addition, if the slot nozzles protrude laterally beyond the side edge of the stacked goods, there is the problem that any side stop cannot be moved up to the side edge of the stacked goods.

[0046] It is considered advantageous if the support bar has a plurality of quick-action clamping devices arranged side by side in the width direction for releasably fastening the slot nozzles to the support bar. A suspension structure is attached to the respective slot nozzle, the respective slot nozzle being suspended in one of the quick-action clamping devices by means of the suspension structure. The respective quick-action clamping device comprises a clamping device for clamping the position of the respective suspension structure in the quick-action clamping device. The clamping device is preferably manually operable and comprises a toggle lever. The quick-action clamping device can be designed, for example, as an eccentric clamp.

[0047] Preferably, the support bar has at least four, in particular at least six, preferably at least eight, particularly preferably exactly eight quick-action clamping devices for releasably fastening the slot nozzles to the support bar.

[0048] It is considered advantageous if each slot nozzle has a centering element protruding in the width direction, wherein the centering element of the slot nozzle is inserted into a corresponding centering opening of the adjacent slot nozzle to center the slot openings of the adjacent slot nozzles. This ensures that, with detachable slot nozzles, the slot openings are aligned as precisely as possible. If the slot openings were offset vertically, the same sheet layer would be underflown by the air discharged by one slot nozzle and overflown by the air discharged by the other slot nozzle, which would have a detrimental effect on the shaking process.

[0049] It is considered advantageous if the slot nozzles are suspended in the quick-clamping device and, when the quick-clamping device is released, can be moved to a limited extent in the width direction, allowing the centering element of the slot nozzle to be inserted into the centering opening of the adjacent slot nozzle, or vice versa. The quick-clamping device is then clamped, thereby securing the corresponding slot nozzle in position.

[0050] It is considered advantageous if the air discharged from the slot nozzle is directed at an angle to the support surface of the support table. Preferably, the air discharge direction and the support surface of the support table form an angle of 1° to 8°. This angle range has proven suitable for different stack heights and grammages.

[0051] Preferably, the one or more slot nozzles are pivotable relative to the support surface to change the outflow direction of the air emitted by the slot nozzles relative to the support surface. Depending on the stack height and grammage, it has proven advantageous if the outflow direction of the air emitted by the slot nozzles is slightly inclined relative to the support surface, particularly to ensure that the air also flows through the lower sheet layers, since the support surface of the support table limits downward movement of the one or more slot nozzles.

[0052] In a preferred embodiment, the rear stop is provided with a plurality of discharge channels spaced apart from one another in the width direction, extending in the vertical direction, and closed at the rear for discharging the air blown between the sheet layers of the stacked material by the blowing device and exiting at the rear edge in the vertical direction. The discharge channels are preferably open at their lower end facing the support surface. The discharge channels are preferably open at their upper end facing away from the support surface.

[0053] To form the discharge channels, it is entirely conceivable for the rear stop to have a plurality of spacers protruding in the direction of the stacked goods, extending perpendicular to the support surface and spaced apart in the width direction, such that a vertically running outlet channel is formed between each two adjacent spacers. These spacers can certainly be formed by separate elements that are connected to the rear stop. It is entirely conceivable for the spacer elements to be detachably connected to the rear stop in order to achieve adjustment of the discharge channels by exchanging the spacers. It is considered particularly advantageous if the respective discharge channel has a depth of at least 4 mm, in particular of at least 15 mm. In this case, “depth” is understood to mean the extension of the respective discharge channel in a direction perpendicular to the width extension and perpendicular to the vertical direction.

[0054] It is considered particularly advantageous if the air nozzles of the counter-blowing device are arranged in the area between the discharge channels. It is also considered particularly advantageous if the discharge channels are free of air nozzles. In a further embodiment, at least one discharge channel is arranged between the air nozzles of the counter-blowing device.

[0055] It is considered particularly advantageous if the rear stop has a plurality of spacers, with an air nozzle of the counter-blowing device being formed in every second spacer.

[0056] It is considered particularly advantageous if air nozzles formed in a spacer are spaced from a leading edge of the spacer. This prevents damage caused by an excessive air flow from the air nozzles or even mechanical contact between the respective air nozzle and the trailing edge of the stacked goods.

[0057] In a particularly preferred embodiment, the vibrating table is provided with a control device for controlling the injection device and the counter-blowing device, wherein the control device is configured, depending on the dimensions of the stacked goods and / or the weight of the stacked goods: to adjust the volume flows output by the counter-blowing device and / or the injection device during the vibrating process and / or to move the one slot nozzle or the multiple slot nozzles of the injection device and / or the air nozzles of the counter-blowing device along predetermined travel profiles during the vibrating process. With regard to the travel profiles, it is certainly conceivable for the slot nozzles or the slot nozzle of the injection device to be moved back and forth in the vertical direction, wherein the stacked goods are not necessarily blown completely through in the vertical direction during each travel.

[0058] In principle, it is conceivable and advantageous for the vibrating table to have a stop ruler that can be moved in the width direction to limit the movement of the stacked goods in the width direction and, if necessary, to push protruding sheet layers into the stacked goods by closing the movable side stop. It is also entirely conceivable for this movable side stop to perform a tapping motion during the vibrating process to promote or accelerate the alignment of the stacked goods during the vibrating process.

[0059] Preferably, the cross section of the respective slot nozzle in the vertical direction and / or the cross section of the respective further slot nozzle in the vertical direction is from 8 mm to 15 mm.

[0060] The following figures illustrate the invention in more detail using several exemplary embodiments, without being limited to these. They show:

[0061] Fig. 1 shows an embodiment of a vibrating table according to the invention with a front blowing device and a rear counter blowing device in a perspective view obliquely from the front with stacked goods,

[0062] Fig. 2 the vibrating table according to Fig. 1 in a view from the rear,

[0063] Fig. 3 the vibrating table according to Fig. 2 in a front view,

[0064] Fig. 4 the vibrating table according to Fig. 2 in a view from above, Fig. 5 the vibrating table in a sectional view according to the line VV in Fig. 4,

[0065] Fig. 6 the vibrating table in a view along the line VI-VI in Fig. 4,

[0066] Fig. 7 a partial area of ​​the blowing device of the vibrating table according to Fig. 1 in a view obliquely from the front,

[0067] Fig. 8 a partial area of ​​the blowing device of the vibrating table according to Fig. 1 in a view obliquely from the rear,

[0068] Fig. 9 a slot nozzle of the injection device in a perspective view,

[0069] Fig. 10 shows a further embodiment of the vibrating table according to the invention with a front blowing device and a rear counter blowing device in a perspective view obliquely from the rear with stacked goods,

[0070] Fig. 11 the counter-blowing device of the vibrating table according to Fig. 10 in a view from behind,

[0071] Fig. 12 the counter-blowing device of the vibrating table according to Fig. 10 in a front view,

[0072] Fig. 13 the counter-blowing device of the vibrating table according to Fig. 10 in a perspective view from behind,

[0073] Fig. 14 the counter-blowing device of the vibrating table according to Fig. 10 in a perspective view from the front,

[0074] Fig. 15 shows the blowing device of the vibrating table according to Fig. 10 in a perspective view. In the figures, the spatial directions, namely the vertical vertical direction Z, the horizontal width direction Y, and the horizontal longitudinal direction X, are indicated by arrows.

[0075] Figs. 1 to 8 show a vibrating table 1 for vibrating stacked material 2 in sheet layers. The stacked material 2 consists of printed sheets 3 stacked in a stacking direction, which in this case is identical to the vertical direction Z.

[0076] The vibrating table 1 has an inclinable support table 4, wherein the support table 4 has a vibrating plate with a support surface 5 for placing the stacked goods 2. The support table 4 has a rear stop 6 and a lateral stop 7 for the stacked goods 2 placed on top. The rear stop 6 can be moved in the vertical direction Z, so that the rear stop 6 can be moved into a lowered position in which the rear stop 6 is shifted downwards relative to the support surface 5, and thus does not protrude from the support surface 5. In the lowered position of the rear stop 6, the stacked goods 2 can be pushed off the support surface 5 in the longitudinal direction X. The two stops 6, 7 enclose a right angle and serve to align the stacked goods 2 resting on the support surface 5 during the vibrating process.In order to align the stacked goods 2 resting on the support surface 5, the support table 4 is tilted from a horizontal position, thus from a position in which the support surface 5 is horizontally aligned, in the direction of the two stops 6, 7 in order to achieve precise edge alignment of the stacked goods 2 at the stops 6, 7. In the figures, the support table 4 is not tilted, so that the support surface 5 is horizontally aligned.

[0077] A vibrating device 10 in the form of a vibrating motor, shown only schematically in Fig. 5, is attached to the vibrating table 1 and is designed to set the vibrating plate and thus the support surface 5 into a shaking or vibrating movement in a known manner. On the underside of the support table 4, two guide rails 8 are arranged laterally for a U-shaped portal frame 9 spanning the support table 4. The portal frame 9 can be moved parallel to the support surface 5 in the longitudinal direction X in the direction of the rear stop 6 and vice versa. A spreading device (not shown in detail) is mounted in the portal frame 9. Following the shaking process, the air can be pressed out of the stacked goods 2 by means of the spreading device.The spreading device is lowered onto the stacked material 2 to spread the air out of the stacked material 2 and is then moved in the longitudinal direction X by means of the portal frame 9 in order to spread the air between the individual layers of the stacked material 2.

[0078] Furthermore, a hold-down device in the form of a hold-down plate 11, which can be moved perpendicularly to the support surface 5, is mounted in the portal frame 9. This hold-down plate 11 serves to hold down the stacked goods 2 and in particular the uppermost printed sheet 3 or the upper printed sheets 3 in order to prevent the uppermost printed sheets 3 from becoming detached during the jogging process and / or to prevent the uppermost printed sheets 3 from floating excessively during the jogging process.

[0079] To improve and accelerate the jogging process, particularly with high stack levels, the jogging table 1 has a front blowing device 13, wherein the front blowing device 13 has seven slot nozzles 14 arranged side by side in the width direction Y of the stacked product 2 for discharging air. The slot nozzles 14 are configured to blow air from a front edge 15 of the stacked product 2 toward a rear edge 16 of the stacked product 2, said rear edge 16 resting against the rear stop 6, in order to introduce air between the individual printed sheets 3, thereby promoting floating and thus movement of the individual printed sheets 3 relative to one another during the jogging process.

[0080] The blowing device 13 makes it possible to reliably align large formats and / or high stack layers and / or low grammage printed sheets by means of the vibrating table 1.

[0081] The slot opening 17 of the respective slot nozzle 14 extends in the width direction Y, wherein the slot nozzles 14 are jointly movable perpendicular to the support surface 5, thus in the vertical direction Z. For this purpose, the slot nozzles 14 are fastened to a common support bar 18, wherein the support bar 18 is connected to the portal frame 9 so that it can be moved in the vertical direction Z. The movement of the support bar 18 in the vertical direction Z is driven by two spindle drives 12. The two spindle drives 12 and the support bar 18 are attached to two guide carriages 30, which in turn are attached along a rail guide 31 extending in the width direction Y and fastened to the portal frame 9, and can be manually moved along this rail in the width direction to align the support bar 18 in the width direction Y.In the desired orientation in the width direction Y, the guide carriages 30 can be fixed in position on the rail guide 31 by means of an adjustable clamping device 33.

[0082] The respective slot nozzle 14 is detachably attached to the support bar 18, wherein the support bar 18 has, for this purpose, several, namely eight, quick-action clamping devices 19 arranged along the support bar 18 for fastening the individual slot nozzles 14. In order to fasten the slot nozzles 14 to the support bar 18, a bow-shaped suspension structure 20 is attached to the respective slot nozzle 14, wherein the respective slot nozzle 14 is suspended in one of the several quick-action clamping devices 19 by means of the suspension structure 20. To fix the position of the respective suspension structure 20 on the support bar 18, the respective quick-action clamping device 19 has a clamping plate 21 which can be advanced in the direction of the support bar 18 by turning an eccentric lever 22, whereby the suspension structure 20 is held in a clamping manner between the support bar 18 and the clamping plate 21. In the present case, only seven of the eight quick-action clamping devices 19 are equipped with a slot nozzle 14.The outermost quick-clamping device 19, on the right in Fig. 3, is unequipped. However, this quick-clamping device 19 can also be equipped with a slotted nozzle 14.

[0083] In order to align the slot openings 17 of the slot nozzles 14 as precisely as possible to one another and thereby avoid an offset of the slot openings 17 in the vertical direction Z, the respective slot nozzle 14 has a centering element 23 protruding in the width direction Y, wherein the centering element 23 is inserted into a corresponding centering opening 24 of the adjacent slot nozzle 14.

[0084] The slot nozzles 14 of the injection device 13 are supplied with air via a first blower device (not shown in detail), the slot nozzles 14 being connected to the first blower device for this purpose via flexible hoses (not shown in detail).

[0085] In order to prevent air from accumulating in the stacked goods 2 and to promote complete blowing through of the stacked goods 2 in the longitudinal direction X, the rear stop 6 has a plurality of discharge channels 25 which are spaced apart from one another in the width direction Y and extend perpendicular to the support surface 5 in the vertical direction Z, and are closed at the rear. They are used to discharge the air blown in between the layers of the stacked goods 2 by means of the blowing device 13 and exiting at the rear edge 16 of the stacked goods 2 upwards and downwards in the vertical direction Z. The stacked goods 2 rests against the projections 26 delimiting the discharge channels 25 in the longitudinal direction X. In the present case, the discharge channels 25 are open both upwards and downwards, whereby a particularly efficient discharge of the air exiting at the rear edge 16 is achieved.

[0086] In order to prevent the injected air from escaping on the side opposite the lateral stop 7, the vibrating table 1 has a stop ruler 27 which can be moved in the width direction Y of the stacked goods 2, wherein this stop ruler 27 is moved to the side edge of the stacked goods 2 opposite the lateral stop 7 and is thus adapted in terms of its position to the format of the printed sheets 3 or the stacked goods 2.

[0087] In addition to the front blowing device 13, the vibrating table 1 has a rear counter-blowing device, wherein this counter-blowing device has a plurality of air nozzles 28 for discharging air, wherein the plurality of air nozzles 28 are arranged at a distance from one another in the width direction Y of the stacked goods 2 in the region of the rear stop 6 and are configured to blow air from the rear edge 16 of the stacked goods 2 between the sheet layers of the stacked goods 2 in the direction of the front edge 15 of the stacked goods 2. In the present case, five air nozzles 28 are arranged in the region of the rear stop 6 and can be moved together in the vertical direction Z. For this purpose, the air nozzles 28 are fastened to a common support beam 29, wherein the support beam 29 can in turn be moved in the vertical direction Z by means of two spindle drives 12.

[0088] While the slot nozzles 14 of the front blowing device 13 blow air almost across the entire width Y of the stacked product 2 and are directly adjacent to one another for this purpose, the air nozzles 28 of the rear counter-blowing device are spaced apart from one another and each have a circular outlet cross-section. By means of the air nozzles 28 of the rear counter-blowing device, air is therefore only blown into the stacked product 2 from the rear edge 16 in a limited local manner and at spaced-apart points. The rear counter-blowing device has proven advantageous in that, with particularly large-format printed sheets 3 or sheet layers of the stacked product,

[0089] 2 reliably enables the air blown in by the front blowing device 13 to flow from the front edge 15 to the rear edge 16. The air nozzles 28 of the rear counter-blowing device slightly lift the individual layers of the stacked material 2 by the air blown in from the rear edge 16, so that the flow resistance for the air blown in from the front edge 15 is reduced and thereby enables complete blowing from the front edge 15 to the rear edge 16. Since only the layered sheets need to be lifted, relatively few air nozzles 28 and a relatively low volume flow can be used and the desired effect can still be achieved. The rear counter-blowing device allows the blowing device 13 to work with a lower volume flow than would be necessary if there were no rear counter-blowing device.This prevents the front edge of the printed sheets 3 from being stressed during blowing in and any damage to the front edge or even tearing of the printed sheets 3.

[0090] By providing the rear counter blowing device, printed sheets can also be

[0091] 3 with low grammage and / or high stack layers can be reliably vibrated without the risk of tearing or ripping.

[0092] As can be seen in particular from Fig. 5, an air nozzle 28 is arranged in every second projection 26 of the rear stop 6, wherein the projections 26 in which an air nozzle 28 is arranged have a through-slot 32 which extends in the vertical direction Z. The respective air nozzle 28 is arranged in this through-slot 32 and can be moved along the through-slot 32 in the vertical direction Z. The respective air nozzle 28 is set back from the rear edge 16 of the stacked goods 2 which rests against the rear stop 6, so that the respective air nozzle 28 is spaced from the rear edge 16. This prevents damage to the rear edge 16 of the stacked goods 2 due to mechanical action by the air nozzles 28.

[0093] The counter-blowing device is supplied with air via a second blower device, which is not identical to the first blower device that supplies air to the slot nozzles 14 of the injection device 13. It is considered particularly advantageous if the first blower device is larger than the second blower device, or if the front injection device 13 is supplied with more blowing air than the rear counter-blowing device.

[0094] Figs. 10 to 15 show a further embodiment of the vibrating table 1 or components of the further embodiment of the vibrating table 1. The further embodiment differs from the embodiment according to Figs. 1 to 9 essentially by the features described below.

[0095] The air nozzles 28 of the counter-blowing device are additional slot nozzles 40, which are designed similarly to the slot nozzles 14 of the inlet device 13. These additional slot nozzles 40, in this case four, each have an additional slot opening 41 extending in the width direction Y. The slot nozzles 40 are in turn mounted in a common support beam 29 and can be moved together in the vertical direction Z. The rear stop 6 has through openings 42, wherein the additional slot nozzles 40 can be moved along the through openings 42 in the vertical direction Z.

[0096] It has been shown that the use of additional slot nozzles 40 in the counter-blowing device is particularly advantageous for large-format sheets and a large stack height.

[0097] Five front hold-down elements 50 are mounted in the portal frame 9, wherein the front hold-down elements 50 are arranged next to one another in the width direction Y, wherein the front hold-down elements 50 can be transferred independently of one another from an initial position into a hold-down position. In Figure 10, the three left front hold-down elements 50 are in the hold-down position and the two right hold-down elements 50 are in the initial position. In the hold-down position, the front hold-down elements 50 limit the floating of the sheet layers in the vertical direction Z. In a manner analogous to the hold-down plate 11, this prevents the uppermost sheet layer(s) from being deflected excessively due to the relatively large air volume or strong air flow of the slot nozzles 14 of the injection device 13 or even from becoming completely detached from the remaining stacked goods 2.The transfer of the respective hold-down element 50 from the initial position to the open position is carried out in the present case by a movement in the vertical direction Z combined with a pivoting of the front hold-down element 50.

[0098] Two rear hold-down elements 51 are mounted in the rear stop 6, which limit the floating of the sheet layers in the vertical direction Z in the area of ​​the rear edge 16 of the stacked material 2.

[0099] Figure 15 shows the injection device 13 of the further embodiment of the vibrating table 1 in isolation. The plurality of slot nozzles 14 are spaced apart from one another in the width direction Y, with a spacer 60 being arranged between each adjacent slot nozzle 14 in the width direction Y, with the respective spacer 60 protruding relative to the plurality of slot nozzles 14 in the direction of the rear stop 6. In addition, a spacer 60 is arranged next to each of the slot nozzles 14 located on the outside in the width direction Y. The spacers 60 serve in particular to prevent mechanical contact between the slot nozzles 14 and the stacked goods 2 during a vibrating process or a pushing-out process. The spacers 60 can also protrude relative to the slot nozzles 14 in the direction of the support table 4 in the vertical direction Z.This allows the spacers 60 to contact the support surface 5 of the support table 4 without the slotted nozzles 14 contacting the support surface 5 of the support table 4. This allows for particularly good and clean pushing off of the vibrated material 2 from the support table 4. In particular, with such a design, even the lowest sheet layers can be contacted by the spacers 60 in order to push them cleanly off the support table 4. The spacers 60 have a plastic glider at their end facing the support table 14 to promote damage-free sliding off the support surface 5. The spacers 60 are movable in the vertical direction Z.

[0100] The respective slot nozzle 14 can be moved independently of the other slot nozzles 14 in the vertical direction Z from a parked position to a use position, wherein the parked position in the vertical direction Z is above the use position. In Figure 15, the two left-hand slot nozzles 14 are in the use position, whereas the two right-hand slot nozzles are in the parked position. This advantageously allows the injection device 13 to be adapted to the width of the stacked goods 2 by, depending on the width of the stacked goods 2 and / or the direction of inclination of the support table 4, those slot nozzles 14 which would inject air laterally to the side of the stacked goods 2 in the width direction are moved into the parked position and thus do not inject air into the stacked goods 2.

[0101] The injection device 13 has a respective impact shield 61 assigned to the respective slot nozzle, wherein the impact shields 61 are arranged such that, when the respective slot nozzle 14 is in the parked position, the impact shields 61 cover the slot opening 17 of the slot nozzle 14 in the direction of the rear stop 6. This prevents air from being blown in the direction of the rear stop 6 from a slot nozzle 14 in the parked position. In addition, the impact shield 61 achieves a flow resistance in the region of the slot nozzle 14 in the parked position that is similar to that which would be the case if the slot nozzle 14 were blowing onto stacked goods 2. In terms of flow technology, the impact shield 61 essentially simulates a leading edge 15 of stacked goods 2 in order to achieve a flow resistance that essentially corresponds to that of stacked goods 2.As a result, a similar dynamic pressure is achieved by the impact shield 61 in the slot nozzle 14 in the parking position as in the fluidically coupled slot nozzle 14 in the parking position, which blows onto the front edge 15 of the material 2, whereby the volume flow through the respective slot nozzle 14 of the fluidically coupled slot nozzles 14 is approximately the same, regardless of whether one of the fluidically coupled slot nozzles 14 is in the parking position and therefore does not blow onto the front edge 15 of the stacked material 2.

[0102] List of reference symbols

[0103] 1 vibrating table

[0104] 2 stacked goods

[0105] 3 printed sheets

[0106] 4 support table

[0107] 5 Support surface

[0108] 6 rear stop

[0109] 7 side stop

[0110] 8 Guide rail

[0111] 9 portal frames

[0112] 10 vibrating device

[0113] 11 Hold-down plate

[0114] 12 spindle drive

[0115] 13 Blowing device

[0116] 14 Slot nozzle

[0117] 15 leading edge

[0118] 16 trailing edge

[0119] 17 Slot opening

[0120] 18 Support bar

[0121] 19 Quick release device

[0122] 20 Hanging structure

[0123] 21 clamping plate

[0124] 22 eccentric lever

[0125] 23 Centering element

[0126] 24 Centering opening

[0127] 25 discharge channel

[0128] 26 lead

[0129] 27 Stop ruler

[0130] 28 Air nozzle

[0131] 29 supporting beams

[0132] 30 Guide carriage 31 Rail guide

[0133] 32 through slot

[0134] 33 clamping device

[0135] 40 additional slot nozzle 41 additional slot opening

[0136] 42 passage opening

[0137] 50 front hold-down element

[0138] 51 rear hold-down element

[0139] 60 Spacer element 61 Impact shield

[0140] X Longitudinal direction

[0141] Y latitude direction

[0142] Z vertical direction

Claims

Patent claims 1. Vibrating table (1) for vibrating stacked material (2) in sheet layers, comprising: - an inclinable support table (4), wherein the support table (4) has a vibrating plate with a support surface (5) for placing the stacked goods (2), a rear stop (6) for the stacked goods (2) placed thereon and at least one lateral stop (7) for the stacked goods (2), wherein the support table (5) is inclinable from a horizontal position in the direction of the two stops (6, 7), - a vibrating device (10) which is designed to vibrate the vibrating plate of the support table (4) into a shaking movement, - a front injection device (13), wherein the front injection device (13) one or more slot nozzles (14) arranged side by side in a width direction (Y) of the stacked goods (2) for discharging air, wherein the one or more slot nozzles (14) are designed to blow air from a front edge (15) of the stacked goods (2) facing away from the rear stop (6) between the sheet layers of the stacked goods (2) in the direction of a rear edge (16) of the stacked goods (2) resting against the rear stop (6), wherein a slot opening (17) of the respective slot nozzle (14) extends in the width direction (Y), wherein the one or more slot nozzles (14), in particular jointly, are movable in a vertical direction (Z) running perpendicular to the support surface (5), - a rear counter-blowing device, wherein the counter-blowing device has a plurality of air nozzles (28) for discharging air, wherein the plurality of air nozzles (28) are arranged spaced apart from one another in the width direction (Y) of the stacked goods (2) in the region of the rear stop (6) and are designed to blow air from the rear edge (16) of the stacked goods (2) between the sheet layers of the stacked Goods (2) towards the front edge (15) of the stacked goods (2).

2. Vibrating table (1) according to claim 1, wherein the injection device (13) has a first blower device for supplying the slot nozzles (14) with air and wherein the counter-blowing device has a second blower device operating independently of the first blower device for supplying the air nozzles (28) of the counter-blowing device with air.

3. Vibrating table (1) according to one of claims 1 to 2, wherein the plurality of slot nozzles (14) are spaced apart from one another in the width direction (Y), wherein a spacer (60) is arranged between slot nozzles (14) adjacent in the width direction (Y), wherein the spacer (60) protrudes in the direction of the rear stop (6) relative to the plurality of slot nozzles (14), in particular to avoid mechanical contact between the slot nozzles (14) and the stacked goods (2) during a vibrating process or a pushing-out process.

4. Vibrating table (1) according to one of claims 1 to 3, wherein the air nozzles (28) of the counter-blowing device are movable together in the vertical direction (Z).

5. Vibrating table (1) according to one of claims 1 to 4, wherein the rear stop (6) has through openings (42) and / or through slots (32) which extend in the vertical direction (Z), wherein the air nozzles (28) are movable along the through openings (42) and / or through slots (32).

6. Vibrating table (1) according to one of claims 1 to 5, wherein the air nozzles (28) of the counter-blowing device are designed as further slot nozzles (40), wherein a further slot opening (41) of the respective further slot nozzle (40) extends in the width direction (Y).

7. Vibrating table (1) according to one of claims 1 to 6, wherein the vibrating table (1) has a portal frame (9) connected to the tiltable receiving table (4), wherein the one slot nozzle (14) or the plurality of slot nozzles (14) are mounted jointly and / or each movable in the vertical direction (Z) in the portal frame (9).

8. Vibrating table (1) according to claim 7, wherein the portal frame (9) is movable parallel to the support surface (5) in a longitudinal direction (X) extending perpendicular to the rear stop (6) in the direction of the rear stop (6).

9. Vibrating table (1) according to one of claims 1 to 8, wherein the one or more slot nozzles (14) are jointly displaceable along the width direction (Y) and are positionally fixable in the width direction (Y) by means of a fixing device.

10. Vibrating table (1) according to one of claims 1 to 9, wherein the injection device (13) comprises a plurality of slot nozzles (14), wherein the injection device (13) has a support bar (18) extending in the width direction (Y), wherein the slot nozzles (14) are each detachably fastened to the support bar (13).

11. Vibrating table (1) according to claim 10, wherein the support bar (18) has a plurality of quick-action clamping devices (19) formed next to one another in the width direction (Y) for releasably fastening the slot nozzles (14) to the support bar (18), wherein a suspension structure (20) is attached to the respective slot nozzle (14), wherein the respective slot nozzle (14) is suspended in one of the quick-action clamping devices (19) by means of the suspension structure (20), wherein the respective quick-action clamping device (19) comprises a clamping device for clamping the position of the respective suspension structure (20) in the quick-action clamping device (19).

12. Vibrating table (1) according to one of claims 1 to 11, wherein the one or more slot nozzles (14) are pivotable relative to the support surface (5) in order to change an outflow direction of the air emitted by the slot nozzles (14) relative to the support surface (5).

13. Vibrating table (1) according to one of claims 1 to 12, wherein a plurality of discharge channels (25) spaced apart from one another in the width direction (Y), extending in the vertical direction, closed at the rear are formed on the rear stop (6) for discharging the air blown in between the sheet layers of the stacked material (2) by means of the blowing device (13) and exiting at the rear edge (16).

14. Vibrating table (1) according to claim 13, wherein the respective discharge channel (25) has a depth of at least 4 mm.

15. Vibrating table (1) according to one of claims 1 to 14, wherein the vibrating table (1) has a control device for controlling the blowing device (13) and the counter-blowing device, wherein the control device is designed to, depending on the dimensions of the stacked goods (2) and / or the weight of the stacked goods (2): - to adjust the volume flows emitted by the counter-blowing device and / or the injection device (13) during the shaking process and / or - to move the one or more slot nozzles (14) of the injection device (13) and / or the air nozzles (28) of the counter-blowing device along predetermined travel profiles during the shaking process, in particular to vary the output volume flows during the process.

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