EP1795475A2 - Sheet supports - Google Patents

Abstract

The method involves holding sheets at a front edge and a rear edge of supporting units (15, 16), where the sheets are supported at a stacking medium of a sheet stack (7) by bending the sheets. An auxiliary stack support (5) is retracted for forming an auxiliary stack in a stacking area between the supporting units and a stacking surface by increasing a sheet area. The support units are removed before reaching an end position or after completely retracting the auxiliary stack support by moving from the stacking area to a normal position of the auxiliary stack support. An independent claim is also included for a device for supporting edges of a sheet in a sheet delivery of a sheet processing machine.

Description

The invention relates to a method for receiving an auxiliary stack when replacing a stack of sheets in a sheet delivery of a sheet-processing machine according to the preamble of claim 1 and an apparatus for performing the method according to claim 11.

In sheet delivery arches, auxiliary stackers are often provided for carrying out a non-stop stack change, which are retractable during the conveyance of sheets from a sheet-processing machine in a stacking area of the sheet delivery. For this purpose, facilities are used for example in the form of so-called blinds. A roller blind consists of a series of support elements, which can be moved by means of a drive chain in a gap of the conveyed sheet flow in the region of the sheet delivery. The support members may be wrapped by a blind cloth, thus forming a flat storage surface and take during the replacement of a sheet stack from the sheet delivery during his bow further promoted. In this case, it must continue to be ensured that the sheets resting on the auxiliary stack are stored with the exact edges. The exact stacking should also be maintained when the auxiliary stacking devices are removed from the stacking space again and the stacking process continues normally.
It is also important that the roller blind can be moved into the stack area without interference. It must be ensured that no sheets are hit during insertion and thus moved on the stack or even damaged.

A device of the type mentioned is out EP 0 987 105 A2 known. Herein is disclosed a plurality of arch supports which are mountable at different locations along a support of the apparatus with the aim of supporting them in contact with the undercut edge of a sheet at locations of pressure-free corridors. The arch supports are rod-shaped and are Moving the same in the longitudinal direction together spent from a standby position in a catch position.
One object of the arch supports is to form a gap between a sheet processed in particular by means of a rotary printing machine stacked in the sheet delivery and a bow following on the uppermost sheet, in which then for stack change in the continuous printing an auxiliary pile pad, for example, said roller inserted becomes.

Although the arch supports of the known device are distributed to form a gap along the edge of the sheet to be underpinned in a corresponding number along the edge; However, this does not guarantee that all the arch supports in their catching position one and the same bow, since the processed sheets often have no straight edges.

Furthermore, from the DE 100 00 506 B4 a method for sheet recording during stack change in jibs of printing presses and sheet recording for performing the method known. It is provided to retract a roller blind in the stacking area after lowering a sheet pile, recording fingers are retracted in the front area of the sheet stack below the Einfahrniveau of the blinds for receiving the next sheet. When retracting the roller blind, the sheets are lifted off the receiving finger, so that it can be removed from the stacking area. Thereafter, the blind is moved out with release of the bow in the rear area. The sheet receiver for carrying out the method shows the positioning of the receiving finger below the level of the upper edge of the roller blind.
Procedures and sheet recording have the disadvantage that the roller blind must be very accurately retracted into a gap in the sheet so that it can fall under falling sheets fully and thus can safely accommodate. Furthermore, it is difficult to avoid that depending on the type of printing sheet are hit at its trailing edge, which can lead to disturbances to the damage in the sheet delivery. Finally, the arrangement of the receiving finger in the area below the upper edge of the blinds structurally unfavorable, since appropriate free areas are provided in the blind.

One problem is that at the entrance of auxiliary pile supports, such as e.g. an auxiliary stacking device with blind, can come in a sheet delivery to a production stoppage ranging from crumpled through the blind sheet up to a machine damage. The cause lies essentially in the collision of the respective auxiliary pile carrier (roller blind, sword, rake, etc.) with an edge of a sheet falling on the sheet pile. Furthermore, it may happen that a shift of the sheet to be intercepted by edge hits when retracting the auxiliary pile carrier leads to an unintentional sheet ejection past front stack stops from the boom out.

The aim of the invention is therefore to avoid a shift already resting bow through the roller blind safely and to make the process of taking over the auxiliary stack trouble-free.

The object of the invention is to develop a method according to the preamble of claim 1 and an associated device in the simplest possible way so that a safe at all substrates or machine speeds entry of the auxiliary stack support is made possible without shifting resting bow.

The object thus achieved is achieved in a method having the features of claim 1 and an associated device having the features of claim 11.

According to the invention, a method is proposed in which a support or a separating device is arranged in the sheet delivery that the trailing edge and the leading edge of a collision-prone sheet are held so high that the or the auxiliary pile carrier can safely enter below. The support or separation device is arranged so that, after lowering the main stack, with the front and rear edges of the sheet held down lower in the stack center on the surface of the sheet pile and can support it, so that the sheet is held securely until the Auxiliary pile carrier completely is retracted into the stacking area. In this case, the auxiliary pile carrier takes over the bow from the surface of the sheet pile.
It proves to be particularly advantageous that the method allows that separating operations are easily carried out when a first sheet rests only on the front support means, while a second subsequent sheet rests on both the front and on the rear support means. By appropriate Ausfahrbewegungen the front support device during retraction of the auxiliary pile support so the first and the second sheet can be safely separated and the acquisition of the auxiliary stack by the auxiliary stack carrier easily possible.

According to the invention, a device is further proposed, in which a support or a separating device is arranged in the sheet delivery that the trailing edge of a collision-prone sheet is held so high that the or the auxiliary pile carrier can drive safely underneath. Furthermore, a further support or separating device is provided which holds up the leading edge of the same sheet, so that the sheet is held at the entrance of the auxiliary pile support on two support or separating devices until the auxiliary pile carrier is fully retracted into the stacking area.

This device consists of a plurality of support elements, which are arranged in the sheet delivery above the auxiliary pile carrier and the front of the sheet stack of the sheet stack and stand outside of the sheet format. The support elements can be tapered and rounded at their end.

The support elements may be connected to one or more mechanical cross-linking elements whose length is variable, e.g. an elastic cord, a spring-loaded wire rope, a telescopic rod, etc.

In response to a control signal, the support elements enter the stacking space and the beginning and the end of a sheet come to lie on it.

Due to the support of the sheet in the leading edge and in the trailing edge region, a sagging of the printing material up to the upper edge of the sheet pile can be permitted for reliable support.

It may be provided in an advantageous manner that the auxiliary stack carrier retracts only when it is ensured that the sheets still falling beneath the support elements have also arrived in the area below the auxiliary stack carrier. For this purpose, e.g. a corresponding timing provided or the falling sheets are detected by sensors below the support elements.

• (a) Die Anordnung ist kompakt, kostengünstig und kann auf sehr einfache Weise in einem Bogenausleger mit Nonstop-Einrichtung nachgerüstet werden.
• (b) Wesentlich ist die sichere Vermeidung von Kantentreffern und daraus entstehenden Folgen von Produktionsunterbrechung bis zur Beschädigungen.
• (c) Die Reduzierung von Makulatur ist möglich, da der unterste Bogen des Hilfsstapels bei entsprechender Länge der Auflageelemente erst relativ weit innerhalb des Stapelbereichs Kontakt mit dem Hilfsstapelträger hat und so weniger beeinflusst wird.
• (d) Die Bogen werden auch sicher verarbeitet, wenn unterschiedliche Bogen von den Auflageelementen gefangen wurden. Der Hilfsstapelträger übernimmt die Trennung des oberen und unteren Bogens automatisch, so dass es nicht zu Betriebsstörungen kommt.

The described arrangement of support elements has several advantages:

• (a) The arrangement is compact, inexpensive and can be retrofitted in a very simple way in a sheet delivery with non-stop equipment.
• (b) It is essential to safely avoid edge hits and the resulting consequences of production interruption to damage.
• (c) The reduction of waste paper is possible, since the lowermost sheet of the auxiliary stack with a corresponding length of the support elements only relatively far within the stacking area has contact with the auxiliary stack carrier and is less affected.
• (d) The sheets are also safely processed when different sheets have been caught by the support members. The auxiliary pile carrier automatically handles the separation of the upper and lower sheets, so that no malfunctions occur.

In the following, an embodiment of the invention will be described in detail with reference to drawings.

Figur 1

ein Schema eines Bogenauslegers mit einer Non-Stop-Stapelwechseleinrichtung.

Figuren 2 bis 4

schematische Darstellungen zum Ablauf des erfindungsgemäßen Verfahrens und der zugehörigen Vorrichtung im Zusammenwirken mit einem Hilfsstapelträger, und

Figuren 5 und 6

schematische Darstellungen zum Ablauf einer Variante des erfindungsgemäßen Verfahrens und der zugehörigen Vorrichtung im Zusammenwirken mit einem Hilfsstapelträger.

Hereby shows:

FIG. 1

a diagram of a sheet delivery with a non-stop stack change device.

FIGS. 2 to 4

schematic representations for the course of the method and the associated device in cooperation with an auxiliary stack carrier, and

FIGS. 5 and 6

schematic representations for the course of a variant of the method according to the invention and the associated device in cooperation with an auxiliary stack carrier.

FIG. 1 shows a schematic overview of a sheet delivery 1 for a so-called non-stop stack change. In the sheet delivery 1 by means of a conveyor system 10, z. B. an endless chain conveyor, conveyed by a sheet-processing machine forth in the transport direction R continuous finished sheet for stacking. The sheets are placed on a stack of sheets 7 against front stack stops 11. The sheets are pulled in the tray for proper positioning of the conveyor system 10 via a sheet brake 13 and are secured at its rear edge by rear stack stops 14. Sheet brake 13 and stack stops 14 can be connected together and be adjustable together to the required sheet size of the sheet pile 7.

For uninterrupted replacement of a complete sheet stack 7 against a new, empty stack transport means, e.g. an empty stacking pallet 12, an auxiliary stacking device 2 is provided in the sheet delivery 1.

The auxiliary stacking device 2 includes a support frame 3, which is arranged by means of a Hilfssstapelhubwerks 4 in the sheet delivery 1 liftable and lowered. On the support frame 3, an auxiliary stack support 5 - for example in the form of a roller blind - arranged, which is retractable during a stack change in the stacking area of the sheet delivery 1 and by means of which an auxiliary stack 6 can be formed there at times.

For this purpose, the auxiliary stack carrier 5 consists of support elements, such as rods or tubes, which are guided on drive chains on guides in the stacking area of the sheet delivery 1 retractable.
According to a known embodiment, the auxiliary pile support 5 can be provided with a blind cloth covering the support elements, so that a substantially smooth deposition surface is formed on the auxiliary pile support 5. It is also possible to use narrow ribbons or strings to surround the roller blind rods in order to bridge the spaces between the roller blind rods. This sheet edges, in particular the first sheet to be deposited can not get into these spaces.

On the auxiliary stack carrier 5 sheets are deposited to an auxiliary stack 6, wherein the auxiliary stacking device 2 at the Hilfsstapelhubwerk 4 during the formation of the auxiliary stack 6 to maintain a proper distance of the surface of the auxiliary stack 6 of the sheet releasing conveyor system 10 is raised and lowered.

A sheet receiving the sheet during the normal production process, the main stack 7 of the sheet delivery 1 is positioned below the auxiliary stack 6 on a pile support plate 8 at a Stapelhubwerk 9 and is removed in a stack change from the sheet delivery 1, while the auxiliary stack 6 is formed on the auxiliary stacking device 2.

For inserting the auxiliary pile carrier 5 in the stacking area during the production process, ie while the conveyor system 10 continuously supplies sheets, it is first necessary to define a gap in the sheet flow, in which the auxiliary pile carrier 5 can be retracted.
Furthermore, it should be ensured that the sheet or sheets resting on the auxiliary pile carrier 5 can not be displaced beyond the boundary by the front stacking stops 11 during its entry into the stacking area.
According to this support elements 15, 16 are arranged in the sheet delivery 1, that a trailing edge of a collision-prone sheet B is held up while the auxiliary pile support 5 is retracted thereunder. Furthermore, a leading edge of the sheet B is supported in the region of the front stack stops 11.

To explain the arrangement is Figure 2, the initial situation after retraction of the support elements 15, 16 shown in the stacking area. The support elements 15, 16 consist of one or more transverse to the sheet transport direction R in the region of the front and rear upper edge of the sheet stack 7 arranged separating elements, the underside of which is arranged above the upper edge of the auxiliary stack carrier 5. The position of the support elements 15, 16 must be in the rest state outside the predetermined by the sheet stack 7 sheet format. The support elements 15, 16 may be bevelled at their leading edge facing the stack area. Furthermore, the support elements 15, 16 on a controllable drive, by means of which they are retractable at pre-selectable times in the stacking area and can be withdrawn from there again. The support elements 15, 16 may each be provided with an edge stop, which serves for fixing at least the lowermost resting sheet at the front and rear edge in the retracted position.

As drives, for example, pneumatic cylinders can be provided, by means of which the support elements 15, 16 are movable directly or indirectly parallel to the sheet transport direction R. The drive can alternatively also be mechanical, electrical or hydraulic.
In this case, a control signal is generated by the machine control or manually controlled by the operator on the way drives the support elements 15, 16 retract into the stacking space on the format edge of the sheet pile 7. In this state, the front end of a sheet B rests on the support member 16 and the rear end of a sheet B comes to lie on the support member 15. In this position, the sheet B can rest on its edges on separate edge stops on the support elements 15, 16.

The support elements 15, 16 are usually arranged horizontally or parallel to the sheet transport direction R. Depending on the type of substrate is one in sheet travel direction R sloping arrangement advantageous. For this purpose, an adjustability can be provided such that the angle of inclination of the support elements 15, 16 can be changed.

The auxiliary stack carrier 5 only enters when it is ensured that the sheets B still falling underneath the separating device 15 have also arrived in the area below the auxiliary stack carrier 5. For this purpose, e.g. Waiting a corresponding time or the falling bow are detected as described below the height of the support element 15 sensor.

The control of the support elements 15, 16 can be random, time or angle controlled or controlled by sensors. In the case of the above-described sensory control detect one or more sensors, the falling arc or the gaps between the falling bow and thus allow targeted entry at least of the support element 15 in a gap between two sheets.

The function of the support elements 15, 16 will be explained below with reference to Figures 2 to 4 for a first embodiment.

Fig. 2:

In einem ersten Schritt wird der Bogenstapel 7 auf der Stapeltragplatte 8 zur Einleitung des Wechselvorganges abgesenkt. Der Hilfsstapelträger 5 steht weiterhin zum Einfahren in den Stapelbereich bereit. Die Auflageelemente 15, 16 werden nunmehr in einer ggf. detektierten Bogenlücke in Bogentransportrichtung R bzw. gegen die Bogentransportrichtung R unter einem ankommenden fallenden Bogen B in den Stapelbereich und oberhalb des Bogenstapels 7 eingefahren. Der nunmehr sich auf die Auflageelemente 15, 16 auflegende Bogen B senkt sich im Bereich der Mitte des Bogenstapels 7 auf dessen Oberfläche ab und liegt so in geringem Umfang durchgebogen über seine ganze Länge abgestützt auf.

Fig. 3:

Die Auflageelemente 15, 16 halten die weiterhin ankommenden fallenden Bogen B an ihrem vorderen und hinteren Ende hoch, wobei die bogen B sich in der Mitte durchsenken. Der Hilfsstapelträger 5 wird nun in den durch die Stapelabsenkung definierten Spalt oberhalb der Oberfläche des Bogenstapels 7 und unterhalb der Auflageelemente 15, 16 in Bogentransportrichtung R in den Stapelbereich eingefahren. Dabei hebt der Hilfsstapelträger 5 die Bogen B von der Oberfläche des Bogenstapels 7 ab und übernimmt sie auf einen an seiner Oberseite angeordneten Tragbereich. Der Tragbereich kann durchgehend flächig oder in Längsrichtung streifen- oder linienförmig und als abrollende Oberfläche von Rollen, Bändern, Streifen oder Schnüren ausgebildet sein. Der Hilfsstapelträger 5 ist mit seiner Oberkante dabei in geringem Abstand oder berührend zur Unterseite der Auflageelemente 15, 16 angeordnet. Dadurch liegen die Bogen B nun in einer nur noch sehr wenig gekrümmt ausgebildeten Lage auf dem Hilfsstapelträger 5 auf. Der Bogenstapel 7 wird nunmehr auf der Stapeltragplatte 8 abgesenkt und kann aus dem Bogenausleger 1 entnommen werden.

Fig. 4:

Die Auflageelemente 15, 16 werden nun aus dem Stapelbereich in bzw. entgegen der Bogentransportrichtung R zurückgezogen. Die inzwischen ankommenden und auf den Auflageelementen 15, 16 aufliegenden Bogen B werden dabei vollständig auf dem Hilfsstapelträger 5 abgelegt und bilden dort einen Hilfsstapel 6. Durch die Ausfahrbewegung der Auflageelemente 15, 16 aus dem Stapelbereich in ihre Ausgangsstellung entsteht keine Längsverschiebung von Bogen B, da der Hilfsstapel 6 zwischen den vorderen und hinteren Stapelanschlägen 11, 14 gehalten wird. Die minimale Absenkbewegung an den Rändern des Hilfsstapels 6, kann den Hilfsstapel 6 nicht unzulässig verlagern. Wenn eine leere Stapelpalette 12 mittels der Stapeltragplatte 8 bis unterhalb des Hilfsstapelträgers 5 angehoben wurde, kann der Hilfsstapel 6 als neuer Bogenstapel 7 auf der Stapelpalette 12 gebildet werden. Dazu wird auch der Hilfsstapelträger 5 wieder entgegen der Bogentransportrichtung R aus dem Stapelbereich zurückgezogen, wodurch die Bogen des Hilfsstapels 6 sich auf die Stapel palette 12 ablegen.

The starting position is not shown in detail. For this purpose, the sheet stack 7 is positioned on the stack pallet 12 and on the stack support plate 8 and has reached its maximum height approximately. The support elements 15, 16 are then in waiting position outside of the stack area of the supported in the sheet transport direction R of the conveyor system 10 and released incoming falling bow B ready. The support element 16 is arranged here in the smallest possible distance below the front stack stops 11. Likewise, the auxiliary stack carrier 5 is still provided in the waiting position outside of the stack area.

Fig. 2:

In a first step, the sheet stack 7 is lowered on the stack support plate 8 to initiate the change process. The auxiliary stack carrier 5 is still ready to enter the stack area. The Support elements 15, 16 are now retracted in an optionally detected arch gap in the sheet transport direction R or against the sheet transport direction R under an incoming falling sheet B in the stacking area and above the sheet pile 7. The now resting on the support elements 15, 16 bow B lowers in the region of the center of the sheet pile 7 on the surface and is so bent to a small extent over its entire length supported on.

3:

The support members 15, 16 keep the incoming incoming bow B at its front and rear ends up, the bows B sink through in the middle. The auxiliary stack carrier 5 is now moved into the stack defined by the stacking gap above the surface of the sheet pile 7 and below the support elements 15, 16 in the sheet transport direction R in the stacking area. In this case, the auxiliary pile carrier 5 lifts the sheet B from the surface of the sheet stack 7 and takes it over a arranged on its upper support area. The support area can be continuously flat or in the longitudinal direction strip or linear and be designed as a rolling surface of rollers, belts, strips or cords. The auxiliary stack carrier 5 is arranged with its upper edge while at a small distance or touching the underside of the support elements 15, 16. As a result, the sheets B are now in an only slightly curved position on the auxiliary stack carrier 5. The sheet stack 7 is now lowered onto the stack support plate 8 and can be removed from the sheet delivery 1.

4:

The support elements 15, 16 are now withdrawn from the stack area in or against the sheet transport direction R. The now arriving and resting on the support elements 15, 16 sheet B are thereby completely deposited on the auxiliary stack carrier 5 and form there an auxiliary stack 6. By the extension movement of the support elements 15, 16 from the stack area to its initial position does not produce longitudinal displacement of sheet B, da the auxiliary stack 6 is held between the front and rear stack stops 11, 14. The minimum lowering movement at the edges of the auxiliary stack 6, the auxiliary stack 6 can not shift inadmissible. When an empty stacking pallet 12 has been raised to below the auxiliary stacking carrier 5 by means of the stacking support plate 8, the auxiliary stack 6 can be formed as a new stack of sheets 7 on the stacking pallet 12. For this purpose, the auxiliary stack carrier 5 is again withdrawn against the sheet transport direction R from the stack area, whereby the sheets of the auxiliary stack 6 deposit on the stack pallet 12.

The function of the support elements 15, 16 will be further explained below with reference to Figures 5 and 6 for a second embodiment.

Fig. 5:

Der Bogenstapel 7 ist zu Beginn des Wechselvorganges abgesenkt.
Der Hilfsstapelträger 5 steht zum Einfahren bereit. Wie erkennbar sind die Auflageelemente 15, 16 in unterschiedlichen Höhenniveaus bzgl. der Stapeloberfläche angeordnet, wobei sich das hintere Auflageelement 15 auf einem Niveau oberhalb des vorderen Auflageelementes 16 befindet. Dies ist vorteilhaft, wenn an der hinteren Stapelkante ein Stapelanschiag 14 vorgesehen ist, der mit gesonderten Rückhalteelementen für die Bogenausrichtung versehen ist, wobei diese insbesondere zur Überbrückung der durch den Hilfsstapelträger 5 vorgegebenen Einfahrlücke für eine störungsfreie Bogenausrichtung nützlich sind. Wenn die Auflageelemente 15, 16 unter fallenden Bogen B in den Stapelbereich eingefahren werden kann, bei dieser Anordnung ein Bogen B' an seiner Vorderkante von dem Auflageelement 16 gefangen werden, wobei sein Ende auf der Stapeloberfläche aufliegt, während ein nächster Bogen B" auf beiden Auflageelementen 15, 16 aufliegt und sich im Bereich der Mitte auf den Bogenstapel 7 absenkt. Zwischen den Bogen B' und B" zeigt sich also ein zum Bogenende hin öffnender Spalt S.

Fig. 6:

Die Auflageelemente 15, 16 halten die weiterhin ankommenden fallenden Bogen B an ihren Enden hoch, wobei die Bogen B sich in der Mitte durchsenken. Der Hilfsstapelträger 5 wird nun in den durch die Bogen B' und B" begrenzten Spalt S in Bogentransportrichtung R in den Stapelbereich eingefahren, hebt dabei die Bogen B und B' von der Stapeloberfläche 7 ab und übernimmt sie auf seinen Tragbereich.
Gleichzeitig wird der nur halb hochgehaltene Bogen B' durch die Vorderkante des Hilfsstapelträger 5 von dem Bogen B" getrennt und bleibt auf der Stapeloberfläche liegen.
Bevor die Vorderkante des Hilfsstapelträgers 5 die äußerste Begrenzung der Auflageelemente 16 erreicht werden diese in Bewegung gesetzt und aus dem Stapelbereich zurückgezogen. Die Rückzugbewegung der Auflageelementen 16 kann synchron zur Bewegung des Hilfsstapelträgers 5 erfolgen. Ebenso ist eine vor- oder nacheilende Bewegung möglich. Hierbei ist von Bedeutung wie steif der Bedruckstoff ist.
Aus diesem Grund kann die Ansteuerung des Bewegungsbeginns des Antriebes der Auflageelemente 16 relativ zur Bewegung des Hilfsstapelträgers 5 verstellbar sein. Der Bewegungsbeginn kann bei dünneren Bedruckstoffen später erfolgen als bei steiferen Bedruckstoffen.
Somit werden die Bogen B' und B" vollständig getrennt. Der Bogen B' bleibt dabei auf der Stapeloberfläche liegen, der Bogen B" wird zum untersten Bogen des Hilfsstapels 7, der nun aufgebaut wird. Nach dem vollständigen Einfahren des Hilfsstapelträgers 5 werden auch die Auflageelemente 15 aus dem Stapelbereich zurückgezogen.

The starting situation is to be understood from the process sequence as in the first embodiment to the situation according to FIG.

Fig. 5:

The sheet stack 7 is lowered at the beginning of the change process.
The auxiliary stack carrier 5 is ready for retraction. As can be seen, the support elements 15, 16 are arranged at different height levels with respect to the stack surface, the rear support element 15 being at a level above the front support element 16. This is advantageous if a Stapelanschiag 14 is provided at the rear stacking edge, which is provided with separate retaining elements for sheet alignment, which are particularly useful for bridging the predetermined by the auxiliary stack carrier 5 Einfahrlücke for trouble-free sheet alignment. If the support elements 15, 16 can be moved under falling sheet B in the stacking area, in this arrangement, a sheet B 'caught at its leading edge of the support member 16, with its end resting on the stack surface, while a next sheet B "on both Support elements 15, 16 rests and in the area the middle of the sheet stack 7 lowers. Between the bows B 'and B "so there is a gap opening towards the bow end S.

Fig. 6:

The support elements 15, 16 keep the incoming incoming bow B at their ends high, the bow B sink through in the middle. The auxiliary stack carrier 5 is now moved into the space bounded by the sheets B 'and B "gap S in the sheet transport direction R in the stack area, thereby lifts the sheets B and B' from the stacking surface 7 and takes over on its support area.
At the same time, the only half-held sheet B 'is separated from the sheet B "by the leading edge of the auxiliary pile carrier 5 and remains on the stack surface.
Before the front edge of the auxiliary pile carrier 5 reaches the outermost boundary of the support elements 16, these are set in motion and withdrawn from the stack area. The retraction movement of the support elements 16 can take place synchronously with the movement of the auxiliary stack support 5. Likewise, a forward or lagging movement is possible. It is important how stiff the substrate is.
For this reason, the control of the start of movement of the drive of the support elements 16 relative to the movement of the auxiliary stack support 5 can be adjusted. The beginning of movement can be done later with thinner substrates than with stiffer substrates.
Thus, the sheets B 'and B "are completely separated, the sheet B' remains on the stacking surface, the sheet B" becomes the lowermost sheet of the auxiliary pile 7, which is now being built up. After complete retraction of the auxiliary pile carrier 5 and the support elements 15 are withdrawn from the stack area.

The arrangement of the support elements 15, 16 is selected substantially oriented on the lower edge of the front stack stops 11. In combination with the required lowering of the sheet pile 7 at the beginning of a stack change process can be achieved so that the sheet B experience the least possible deflection before entering the auxiliary pile support 5. The positioning becomes essentially At the same time, however, it is ensured that a gap in the stream of the sheet B falling in the stacking area of the sheet delivery 1 is unambiguously found, so that no sheet B is damaged when the auxiliary pile carrier 5 enters the stacking area or the changing operation can be disturbed.

The support elements 15, 16 may be formed as sheet-like elements to which edge stops are mounted upwardly projecting, if necessary. Each edge of the sheet stack 7 may each have a plurality of support elements 15, 16 may be provided, which are arranged substantially centrally to the stacking edge or symmetrically. It may also be a shift of the support elements 15, 16 are provided parallel to the stack edge.
In further embodiments, the support elements 15 and / or 16 may be supplemented by means of releasable linear support elements, such as cables, connected to their front end. Thus, the effective support surface of the support elements 15 and / or 16 for the front and rear edge of the sheet B can be increased in an advantageous manner.

An advantage of the method and the device according to the invention is that the sheets B are always securely supported in the intermediate storage on the support elements 15, 16 and in the acquisition by the auxiliary stack carrier 5. An impermissible shift by edge hits or the entrance of the auxiliary pile support 5 is reliably avoided, so that a consistently trouble-free stack change is possible.

LIST OF REFERENCE NUMBERS

1

sheet delivery

2

Auxiliary stacker

3

supporting frame

4

Hilfsstapelhubwerk

5

Auxiliary pile carrier

6

waste pile

7

main pile

8th

Pile carrier plate

9

Stapelhubwerk

10

conveyor system

11

sheet stop

12

stacking pallet

13

sheet brake

14

stack stop

15

support element

16

support element

R

Sheet transport direction

B

bow

S

gap

Claims (20)

A method for forming an auxiliary stack when replacing a sheet stack in a sheet delivery of a sheet processing machine with an auxiliary stacking device for undertaking the auxiliary stack during a non-stop stack change, with a plurality of separating elements disposed outside edges of the sheet stack to form a gap in a stream of a conveyor system which is conveyed and released onto the sheet stack,
characterized, - that the sheet stack (7) at the beginning of the change process to form a Einfahrlücke for an auxiliary pile support (5) below stack stops (11, 14) is lowered, such that the stack upper edge is below the height of the stack stops (11, 14), - that of a fixed support means above the auxiliary stacking device (2) at least one in a sheet transport direction (R) leading edge against the sheet transport direction (R) associated support element (16) and of a formatate adjustable support means above the auxiliary stacking device (2) at least one of Sheet transport direction (R) trailing edge of a sheet (B) associated support element (15) in the sheet transport direction (R) are retracted from a basic position in the stacking area of the sheet delivery (1), - That the support elements (15, 16) of the resting sheet (B) upright at its front and rear edge, wherein the (B) are supported under deflection in the stack center on the sheet stack (7), - That the auxiliary pile support (5) for forming an auxiliary stack (6) in the stacking area between the support elements (15, 16) and the stack surface by raising the sagged arc areas and with further on the support elements (15, 16) resting sheet (B) retracted becomes, - And that the support elements (15, 16) before reaching the end position or after complete entry of the auxiliary pile support (5) are removed from the stack area by moving into its normal position. Method according to claim 1,
characterized,
that the respective one or more support elements (15, 16) is substantially centrally or symmetrically to a plane in the extension of the arc (B) transversely to the sheet transport direction (R) moved into the stack area. Method according to claim 1,
characterized,
in that the respective one or more support elements (15, 16) are moved substantially synchronously into the stack area and / or are withdrawn from the stack area. Method according to claim 1,
characterized,
that the respective one or more support elements (15, 16) are retracted at various times in the batch region and / or retracted from the pile region. Method according to claim 1,
characterized,
that the / the support elements (16) are retracted at an earlier time than / the support elements (15) from the pile region. Method according to claim 1 or 2,
characterized,
in that the one or more bearing elements (16) are retracted essentially in a plane just above the upper edge of the auxiliary stacking device (2) and that the one or more support elements (15) extend substantially in a plane above the support elements (16) parallel to the extent of Sheet (B) transversely to the sheet transport direction (R) are retracted into the stacking area. Method according to claim 6,
characterized,
in that when undertaking the beginning of the sheet of a sheet (B ') is arranged by means of the support elements (16) under an arc (B ") which is underpinned by the support elements (15), the auxiliary pile support (5) between the sheet (B ') and the sheet (B ") is moved into the stacking area, wherein the front end of the sheet (B') rested on the support element (16) by means of the auxiliary pile support (5) from the support on the / the support elements (16 ) is pulled out. Method according to claims 5 and 7,
characterized,
that the / the support elements (16) substantially synchronously retracted to the retracting movement of the auxiliary pile carrier (5) from the pile region, wherein the retracting movement of the / of the bearing elements (16) begins before the leading end of the auxiliary pile carrier (5), the outermost boundary of the support elements (16) reached in the stack area. Method according to claims 2 to 8,
characterized,
in that the one or more supporting elements (15, 16) are retracted into the stacking area while tensioning a support region tapering outwards. Method according to one or all of claims 1 to 9,
characterized,
that by means of sensors a gap in the flow of falling sheets (B) is felt and that one or more support elements (15, 16) after leaving the sheet (10) to be held high the following arc (B) from the region of the sensors under tension of a outside tapered bearing area are retracted into the stacking area. Apparatus for supporting edges in at least one sheet in a sheet delivery of a sheet processing machine having auxiliary stacking means for forming an auxiliary stack during a non-stop stack change of a stack of sheets with separators located outside edges of the stack of sheets to form a gap in a stream conveyed by a conveyor system and released on the sheet stack falling bow,
characterized,
in that at least one support element (15) in the sheet conveying direction (R) is insertable into the stacking area of the sheet delivery arm (1) on a format-adjustable carrying device above the auxiliary stacking device (2),
in that at least one support element (16) is arranged to be retractable against the sheet conveying direction (R) in the stacking area of the sheet delivery arm (1) on a frame-fixed carrying device above the auxiliary stacking device (2),
in that the support elements (15, 16) are formed before the entry of an auxiliary pile carrier (5) for supporting a front and rear edge of the sheet (B),
in that the support elements (15, 16) are arranged at a distance above the surface of the sheet stack (2), so that the sheets (B) rest on the support elements (15, 16) with their central part on the surface of the sheet stack held thereunder (7)
and that the support elements (15, 16) are arranged above the upper edge of the auxiliary pile support (5), so that they are completely or not at all underrun when entering the stacking area. Device according to claim 11,
marked by
one or more support elements (15, 16) arranged centrally and / or symmetrically with respect to the front or rear edge of the sheet stack (7) and can be moved into the stack area. Device according to claim 11,
marked by
one or more support elements (15, 16) provided substantially in a plane parallel to a sheet transport plane and retractable into the stack area. Device according to claim 11,
marked by
one or more support elements (15, 16) provided substantially in different planes arranged parallel to a sheet transport plane and retractable into the stack area. Device according to one of claims 11 to 14,
marked by
one or more substantially flat or one-dimensional support elements (15, 16). Device according to one of claims 11 to 15,
marked by
Support elements (15, 16) which are connected to tensionable, linear and flexible support elements for clamping a one of the support elements (15, 16) to the lateral stacking edges tapered support area. Device according to one of claims 15 or 16,
marked by
Support elements (15, 16), which are arranged sloping extending from the edge of the stacking area to the inner region towards the surface of the sheet transport plane. Device according to claims 11 to 17,
marked by
the arrangement of the released from the conveyor system (10) in the height or above or below the support elements (15, 16) falling arc (B) detecting sensors. Device according to claims 11 to 18,
marked by
the arrangement of the released from the conveyor system (10) in the height or above or below the support elements (15, 16) falling arc (B) detecting sensors. Device according to claims 11 to 19,
marked by
the arrangement of drives and associated control devices for the support elements (15, 16), by means of which the support elements (15, 16) are retractable synchronously, simultaneously or at different times and / or with different movement characteristics in the stack area and retractable from the stack area.

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