EP0958219B1 - Stack changing device - Google Patents

Abstract

In a non-stop stack changing device, remaining-stack bars are pulled from the stack area one by one and out-of-line in relation to each other. To this end, a pull/push drive is provided, which makes it possible to push the remaining-stack bars simultaneously into the grooves of a pallet carrying a sheet stack. Furthermore, the pull/push drive makes it possible to pull the remaining-stack bars in pairs from inside outwards out of the stack area. In addition, the remaining-stack bars can be pulled in a first and second sequence in accordance with this model. An individual motor drive is provided for this purpose, which operates interlockingly on each individual remaining-stack bar.

Description

The invention relates to a method according to the preamble of claims 1 and 2 as well a device according to the preamble of claims 3 and 4.

It is known in sheet feeders of sheet printing machines or others sheet processing machines facilities for automated To provide stack changes. These can consist of rake-like structures, so-called residual pile support devices, which with linear and lifting drives horizontal and vertical movement are provided. Such so-called Non-stop stack changers are suitable, for example during printing of paper sheets, i.e. in the machine run, remnants of processed sheet stacks to take over from a grooved pallet, for example a new sheet stack subsequently inserted in the sheet feeder to discontinue. Known devices are characterized by large constructive and assembly costs and require special designs of the Sheet feeder. Furthermore, devices are used, the Remaining stack support device a rake engaging in the grooves of the pallet exhibit. This rake is new when the remaining stack is combined with the used sheet stack as a whole between the two stack parts remove. This entails high driving forces and demands that of the Interface closest arch of the stack very strong. Also are To provide retention means that prevent the stack parts from moving and stress the stack edges. In addition, the operation of the Sheet feeder itself severely disabled or even made impossible. The arc run is difficult to master when changing, so that again and again Waste sheets arise.

Devices have been developed that overcome some of the disadvantages described partially avoid.

DE 3931710 C2 describes a non-stop sheet feeder for Sheet rotation machines known. It has a residual pile support device, those below one leading from the sheet feeder to the sheet rotation machine Belt table is arranged. The residual stack support device has one closed frame on which non-stop rods are arranged, which as Piston rods of individual cylinders are driven by means of a pressure medium can and retractable in the grooves of a pallet carrying a sheet stack are. The non-stop bars are on both sides when retracted of the frame and are to be successively removed from the area of the sheet feeder be removed. Nothing is said about the order. Bridging the gap due to the non-stop rods between the main and remaining stacks an obstacle to a flawless continuous when stacking Processing.

A sheet feeder is known from DE 4203500 A1. It points parallel to Sheet feeder and associated with this end face an auxiliary stack support device as independent unit. In it are individual via a common drive drivable skewers provided in the grooves of a sheet stack carrying Pallet are retractable. The drive has individual chain drives connected to the respective skewers can be coupled. For the guidance and accessibility of the Chain drives require special design measures. The Chain drives completely block the space in front of the sheet feeder, so that this is not accessible. When changing stacks it is provided that the skewers at Combining the main and remaining stacks first on the outside, then in the Middle and finally in the area between the already drawn skewers from the Remove the stacking area so that the rest of the stack is placed gently the stack of sheets should result. However, this succeeds with the required accuracy only with heavy materials such as metal arches, since the arches are in arch in different directions and lower over a large gap that is formed by the skewers.

Finally, DE 19520772 C1 describes a non-stop sheet feeder for Printing machines with retractable and extendable fork bars known. In this Feeders are on both sides of the stacking area transversely to the sheet transport direction movable units of fork rods are provided. The fork bars are connected to each other and together in grooves a stack of sheets carrying pallet retractable. From there, they can take over an auxiliary stack to bridge the period until a new sheet stack is fed. For preliminary approximation of the main and the remaining stack before the final one Unite the fork rods are rectangular in cross section and around one Longitudinal axis rotatable. The fork rods are initially in the upright position inserted orientation to carry the greatest possible load can. They are then turned 90 degrees to approximate them so that the main and residual stacks to each other to the value of the thickness of the narrower side approach. When twisting the fork rods, measures have to be taken to get one Avoid moving the bow closest to the fork rods. this has turned out to be almost impracticable in practice.

Furthermore, DAS 1095297 is a sheet feeder with several Stacking hoists known. It has a fork-shaped residual stack support device on, which is provided with insertable residual stack bars in the grooves of a pallet. The device enables a remnant of a stack of sheets to be taken over from the pallet for the continuous feeding of the sheets during a new sheet stack is inserted into the sheet feeder. The residual stacking device is with a separate hoist parallel to the main stacking hoist within the Sheet feeder connected so that the remaining stack can be raised continuously. The The working area of the residual pile carrier is restricted. The Remaining pile support device hinders access to the sheet feeder.

The aim of the invention is to improve the device for stack change so that the disadvantages described are avoided.

The object of the invention is to provide a device of the type mentioned improve that batch change in a simple and continuous manner is possible, whereby the sheet transport must not be disturbed and the sheets be spared during the change process, so that none due to the stack change conditional waste occurs.

The solution to the problem arises from the patent claims.

It is advantageous that independently movable support and spacer bars are provided in the device, which are drawn from the stacking area not at the same time, but with a time delay, to relieve the sheet material. In this case, a different height of the two rod types can preferably be provided, which produces a flowing settling movement of the remaining stack on the sheet stack. The pulling movement of the bars has no influence on the rest of the stack, so that the paper sheets directly affected are spared, since little or no restraining forces are required.
In particular, the continuous removal of the remaining stack bars from the inside to the outside and in two stages enables the remaining stack to be gently deposited on the sheet stack.
In addition, it is advantageous to make the remaining stacking rods of different lengths depending on the type, so that an improved workflow is created.

Fig. 1

einen Bogenanleger in Seitenansicht,

Fig. 2

einen Bogenanleger in Draufsicht,

Fig. 3

eine Stapelwechselvorrichtung in Draufsicht,

Fig. 4

eine Stapelwechselvorrichtung bei der Übernahme eines Reststapels,

Fig. 5 bis 8

einen Wechselvorgang und

Fig. 9

eine Stapelwechselvorrichtung während des Stapelwechsels.

The invention is illustrated below with reference to drawings. Here show:

Fig. 1

a sheet feeder in side view,

Fig. 2

a sheet feeder in top view,

Fig. 3

a stack changing device in plan view,

Fig. 4

a stack changing device when taking over a remaining stack,

5 to 8

a change process and

Fig. 9

a stack changing device during the stack change.

In Figure 1, a sheet feeder 2 is connected to a sheet processing Machine, for example shown with a sheet printing machine 1. in the Sheet feeder 2, a sheet stack S is used for processing. The Sheet stack S can by means of a main stacker, which is not shown here is shown to be raised in time with the sheet processing. The bow of the Sheet stack S are separated at the top and the Sheet printing machine 1 fed in a sheet stream. In the sheet feeder 2 is For this purpose, a sheet separation device 4 is provided, which with a whole Number of diverse controls for format-dependent settings and for Settings of the supply with suction or blown air is provided. The Controls are used to coordinate the various functions of the Sheet separation device 4 on the need-based transport of the sheets from sheet feeder 2 to sheet printing machine 1. In sheet feeder 2 is still a residual stack support device 3 is arranged, that of the sheet-fed printing press 1 facing end of the sheet feeder 2 is assigned. The Remaining stack support device 3 is provided with a frame 6 in which Remaining stacking rods 7 are mounted to be longitudinally displaceable. By means of the frame 6 is the Remaining stack support device 3 suspended from a remaining stack lifting mechanism 5. The Remaining stacking hoist 5 is only in its position here, but not in details indicated. The residual pile hoist 5 serves a residual pile H im To hold sheet feeder 2 and lift in time with the sheet processing. Therefore the rest of the stacker 5 is also synchronized with the main stacker controllable. The residual pile hoist 5 consists of the sheet feeder 2 connected vertical guide rails 8, on which the frame 6 is guided, and has, for example, lifting chains, by means of which the residual stack support device 3 can be raised or lowered.

In Figure 2, the sheet feeder 2 is shown in a view from above. To the Sheet feeder 2 closes in the direction of sheet travel indicated by arrows a so-called belt table 20, over which the one generated by the separation Sheet current to the sheet processing machine e.g. the printing press 1 is transported. The position of the sheet separation device 4 is also shown in FIG Assignment to the rear edge of the sheet stack S can be seen. The orientation of the Remaining stacking bars 7 are shown in their arrangement in relation to the sheet feeder 2, only the two outer remaining stacking rods 7 are shown and the others are indicated with lines of action. The position shown is for example, the standby position before initiating a Change process or the waiting position outside the operating area of the sheet feeder 2. The remaining stacking bars 7 are within the Remaining pile support device 3 performed so that it is in the position shown Take up the horizontal position outside the area of the sheet feeder 2. The rest of the stack support device 3 with its frame 6 is by means of Guide rails 8 guided on the sheet feeder 2 and vertically movable. The Rest pile hoist 5 is again only indicated in its position and is on the top of the guide rails 8, for example on the frame of the Sheet feeder 2, grips from there on frame 6 of residual stack support device 3 and moves them up and down on the guide rails 8.

From Figure 1 it can be seen that the residual stack support device 3 by means of Guide rails 8 is installed directly in the sheet feeder 2. The Residual pile hoist 5 is on the one hand while supplying the printing press 1 can be raised and lowered with a bow and, on the other hand, the residual stack support device 3 outside the processing area for the actual batch change movable. This arrangement in the sheet feeder 2, this is of his front-side operator side very easily accessible.

FIG. 3 shows a complete representation of the residual stack support device 3. The frame 6 is guided vertically on the guide rails 8. The rest of the stacking rods 7 in the form of supporting rods 7A and spacing rods 7B are guided in the frame 6 in a front support rail 9. A traction drive 11 for occasionally pulling the support rods 7A and spacer rods 7B is arranged on a rear mounting rail 10. The position shown is the waiting position. Furthermore, drives 12 are provided on both sides for the longitudinal displacement of the rear support rail 10 on guide rails 13 on the frame 6. The drives 12 determine the position of the rear mounting rail 10 at the rear end or within the frame 6. The front mounting rail 9 is firmly connected to the frame 6.
The support rods 7A or spacer rods 7B are of different heights. The support rods 7A are, for example, approximately twice as high as the spacer rods 7B. The term height means the expansion of the support rods 7A or spacer rods 7B perpendicular to the plane of extent of the residual stack support device 3. The effect of this measure is shown in detail in the following diagrams.

The support rods 7A and spacer rods 7B can be of the same length. In a preferred embodiment, the support rods 7A are longer than that Spacer bars 7B. The support rods 7A are used to take over a remaining stack H first the load bearing and must be dimensioned accordingly, whereby the load is to be diverted into another suspension element (see Fig. 4).

The residual stack support device 3 is shown in operation in FIG. The support rods 7A, and the spacer bars 7B are by means of the drives 12 together with the rear mounting rail 10 advanced relative to the front mounting rail 9 and inserted in grooves of a pallet P carrying the sheet stack S. Front support rail 9 and rear support rail 10 are located with the traction drive 11 now parallel in front of the pallet P, the rest of a sheet stack S, the so-called residual stack H carries. The pallet P and the remaining stack H become not touched by the front mounting rail 9. The longer and higher Support rods 7A lie on a residual stack lifting rail 14 in the direction of sheet travel seen front end in the sheet feeder 2. This residual stack lifting rail 14 is coupled with a linear actuator and for supporting the support rods 7A and the lifting movement provided during production. The Remaining stack lifting rail 14 and the remaining stack lifting mechanism 5 are both with the Main stacker of the sheet feeder 2 connected or at least so mechanically or control technically coupled with each other that they at Batch processing especially when merging the remaining stack H can be lifted synchronously with a new sheet stack S.

From Fig. 4 it can also be seen that in the position shown Remaining stack support device 3 with support rods 7A inserted into the pallet P. and spacer bars 7B the space within the frame 6 free and the frame 6 is open to the rear. For handling it can be important that the Support rods 7A and spacer rods 7B early, i.e. long before that actually necessary change process can be inserted into the grooves of the pallet P. The remaining stack support device 3 can then together with the sheet stack S. be raised until the stack change must actually take place. Then it is Only lift the remaining stack H from the pallet P. If the remaining stacking rods 7 have moved again, i.e. the batch union has taken place, the Remaining stacking rods 7 can immediately be retracted into the new pallet P.

The actual process of changing the stack is shown below in FIGS. 5 to 8 gradually reproduced.

The prerequisite is that in the sheet feeder 2 a sheet stack S by means of Main stacker during processing, i.e. Separation of the sheets the top of the sheet stack S and their removal in the sheet stream to Printing machine 1 is continuously raised. A point is reached at which only has a remaining stack H of predetermined height from the sheet stack S is available. Depending on the processing speed, only remains a certain period of time until the remaining stack H is also used up. Within this period, a new sheet stack S must be in sheet feeder 2 Are available, otherwise the processing must be interrupted. Therefore, at the predetermined time, depending on the amount of Remaining stack H from the sheet stack S the process for changing the stack in progress set.

FIG. 5 shows schematically how a residual stack H, or the rest of the Sheet stack S, is lifted off the pallet P. This happens because the remaining stacking rods 7 are inserted into the grooves of the pallet P and Pallet P is lowered by means of the main stacker. Then wear first only the higher and elongated support rods 7A, as shown in Figure 4 on the Reststackhubschiene 14 lying on the rest of the stack H. The lower Spacer bars 7B are exposed, but guided by the mounting rails 9, 10. The Support rails 9 and 10 are at this time in a compact position parallel to each other with a small distance from the rear edge of the Remaining stack H positioned. It can be provided that the in relation to the Thinner spacer bars 7B for switching functions on the inside of the stack are extended and also rest on the remaining stack lifting rail 14. Likewise, all spacer bars 7B can be placed on the residual stack lifting rail 14 be designed to be hangable.

FIG. 6 shows how a new sheet stack S is raised against the rest of the stack support device 3 from below. The support rods 7A are in contact with the remaining stack H from above and with the sheet stack S from below. The support rods 7A are thus firmly guided. In terms of control technology, it should be borne in mind that the lifting movement of the remaining stack H and sheet stack S, as already explained above, must be synchronized. When the sheet stack S runs against the support rods 7A, a sensor in the residual stack lifting rail 14 can, for example, initiate the synchronization of the lifting movements of the remaining stack H and sheet stack S and also the pulling movement that now begins.
In a variant, the inner spacer bars 7B can already be in contact with the two stacking surfaces. Then there would only be no support rods 7A in the middle and the remaining stack H would already be lowered there by the height difference of the support rods 7A and spacer rods 7B.

In Figure 7 it is shown that the thicker support rods 7A have already been removed. This process can be carried out, for example, by means of individual drives, but drive connections, for example traction means, can also be stretched out between the traction drive 11 arranged on the rear support rail 10 and the support rods 7A or the spacer rods 7B. To pull the support rods 7A are then individually connected to the traction drive 11, the support rods 7A being released, for example, directly in pairs and thus being pulled in pairs by means of the traction drive 11 from the space between the remaining stack H and the stack of sheets S until they rest against the rear support rail 10 . The train sequence is preferably controlled so that the support rods 7A are subsequently pulled outwards from the center of the stack. As a result, the remaining stack H slowly descends from the center of the stack outwards to the stack edges to a second level, which is represented by the spacer bars 7B. This situation is shown in Figure 7. In the simplest case, the spacer bars 7B are shorter than the support bars 7A and, in the position shown, practically only perform a control function for the continuous stacking, since they no longer rest on the rest of the stacking lifting rail 14 and therefore cannot derive any load.
However, it can also be provided that the spacer bars 7B are of the same length as the supporting bars 7A and then also rest on the residual stack lifting rail 14. This can be used, for example, to detect the end of the pulling movement on the residual stack lifting rail 14 designed as a touch rail and does not impair the control function for stacking. Only the time required for pulling is a little longer.

In Figure 8 is finally the initiation of the completion of the train movement shown. Now in the same rhythm, i.e. preferably in pairs, díe thinner spacer bars 7B, which only have the remaining stack H from the sheet stack S disconnect, but no longer perform a lifting or carrying function, for example also from the center of the stack in pairs outwards towards the stack edges drawn. The auxiliary stack H is now again in a continuous manner Movement on the sheet stack S without the remaining stack H facing each other would move the sheet stack S and therefore clamped by means of restraint be or should be fixed in relation to the sheet stack S. this applies both in the direction of the pulling movement of the remaining stacking rods 7 to the rear Stack edge as well as in the transverse direction to the side stack edges. The Stack change is thus after the union of residual stack H and sheet stack S completed and the remaining stack support device 3 can be repositioned.

FIG. 9 shows the relationship of the pulling movement to the device once again clarified within the sheet feeder 2. The support rods 7A and Spacer bars 7B alternately lie in grooves of a pallet P (one on the other the webs between the grooves of the pallet P normally the sheet stack S has to be presented on top). The support rods 7A are on the Remaining stacking lifting rail 14. The same applies in the case shown to the inner ones Spacer bars 7B, which are only half the height of the support bars 7A. The The pulling process of the support rods 7A begins with those closest to the center of the stack thicker support rods 7A, which are drawn as a pair as shown. Doing so the auxiliary stack H slowly in this area on the thinner spacer bars 7B on. Pulling the thicker support rods 7A and subsequently the thinner ones Spacer bars 7B are fluid and always in close succession separated from each other. For this is a device for controlling the train movement intended. This can be directly in the train drive 11 for the support rods 7A or Spacer bars 7B can be integrated or via further control means on the Actuate the traction drive of each individual support rod 7A or spacer rod 7B.

I. - Bei Erreichen einer Mindesthöhe des Bogenstapels S wird der Stapelwechselvorgang gestartet.

II. - Die Tragstäbe 7A und die Distanzstäbe 7B werden gemeinsam vom Gestell 6 aus in die Nuten der Palette P unterhalb des Bogenstapels S eingeschoben, wobei der Bogenstapel S an der Rückseite zur Reststapeltragvorrichtung 3 hin frei bleibt.

III. - Die Tragstäbe 7A werden von der Reststapelhubschiene 14 unterfahren und angehoben bis der Reststapel H von den Tragstäben 7A getragen wird.

IV. - Die Palette P wird abgesenkt und aus dem Bogenanleger 2 entfernt.

V. - Der Reststapel H wird mittels des Reststapelhubwerkes 5 kontinuierlich zur Vereinzelung der Bogen weiter angehoben.

VI. - Ein neuer Bogenstapel S wird in den Bogenanleger 2 eingesetzt und mittels des Hauptstapelhubwerkes angehoben.

VII. - Bei Berührung der Oberseite des Bogenstapels S mit der Unterseite der Tragstäbe 7A wird der Ziehvorgang der Tragstäbe 7A eingeleitet.

VIII. - Die Tragstäbe 7A werden einzeln oder paarweise von innen nach außen zwischen Reststapel H und Bogenstapel S herausgezogen.

IX. - Der Reststapel H legt sich von innen nach außen kontinuierlich auf den Distanzstäben 7B ab.

X. - Die Reststapelhubschiene 14 wird frei, die Reststapeltragvorrichtung 3 übernimmt keine Last mehr, die verbleibenden Distanzstäbe 7B haben nur noch Steuerungsfunktion für die Stapelvereinigung.

XI. - Die Distanzstäbe 7B werden kontinuierlich von innen nach außen zwischen Reststapel H und Bogenstapel S herausgezogen.

XII. - Der Reststapel H legt sich von innen nach außen kontinuierlich auf der Oberseite des Bogenstapels S ab.

The batch change therefore takes place as follows:

I. - When a minimum height of the sheet stack S is reached, the stack changing process is started.

II. - The support rods 7A and the spacer rods 7B are pushed together from the frame 6 into the grooves of the pallet P below the sheet stack S, the sheet stack S remaining on the back to the rest of the stack support device 3.

III. - The support rods 7A are moved under by the residual stack lifting rail 14 and raised until the residual stack H is carried by the support rods 7A.

IV. - The pallet P is lowered and removed from the sheet feeder 2.

V. - The residual stack H is continuously raised by means of the residual stack lifting mechanism 5 to separate the sheets.

VI. - A new sheet stack S is inserted into the sheet feeder 2 and raised by means of the main stacker.

VII. - When the top of the sheet stack S touches the underside of the support rods 7A, the drawing process of the support rods 7A is initiated.

VIII. - The support rods 7A are pulled out individually or in pairs from the inside to the outside between the remaining stack H and the stack of sheets S.

IX. - The remaining stack H is continuously deposited on the spacer bars 7B from the inside to the outside.

X. - The remaining stack lifting rail 14 becomes free, the remaining stack supporting device 3 no longer takes on a load, the remaining spacer bars 7B only have control functions for the stack union.

XI. - The spacer bars 7B are continuously pulled out from the inside to the outside between the remaining stack H and the stack of sheets S.

XII. - The remaining stack H is continuously deposited on the top of the sheet stack S from the inside out.

I. - Die Reststapeltragvorrichtung 3 wird nach dem Ziehen der Tragstäbe 7A und Distanzstäbe 7B sofort bis zur Stapelunterkante des neuen Bogenstapels S abgesenkt.

II. - Die Tragstäbe 7A und Distanzstäbe 7B werden in die Nuten der Palette P eingeführt, wobei der Einschubweg kleiner ist als der Gesamteinschubweg.

III. - Die Reststapeltragvorrichtung 3 wird lastfrei mit dem Bogenstapel S synchronisiert angehoben.

IV. - Bei Erreichen der Grenzhöhe des Bogenstapels S werden die Tragstäbe 7A und die Distanzstäbe 7B im Rahmen des Restweges bis zur Gesamteinschublänge (wobei die Hinterseite des Bogenstapels S zur Reststapeltragvorrichtung 3 hin frei bleibt) eingeschoben.

V. - Die Reststapelhubschiene übernimmt die Tragstäbe 7A.

VI. - Der Ablauf wird wie oben beschrieben fortgesetzt.

In a modified version of the process, the procedure is as follows:

I. - After the support rods 7A and spacer rods 7B have been pulled, the rest of the stack support device 3 is immediately lowered to the bottom edge of the stack of new sheets S.

II. - The support rods 7A and spacer rods 7B are inserted into the grooves of the pallet P, the insertion path being smaller than the total insertion path.

III. - The rest of the stack support device 3 is lifted synchronously with the sheet stack S in a load-free manner.

IV. - When the limit height of the sheet stack S is reached, the support rods 7A and the spacer bars 7B are pushed in as part of the remaining path up to the total insertion length (the rear side of the sheet stack S remaining free towards the residual stack support device 3).

V. - The remaining stack lifting rail takes over the support rods 7A.

VI. - The process continues as described above.

The whole procedure has the advantage that the remaining stack H is the sheet stack S continuously approaching, so that no jump points when removing the Remaining stacking rods 7 arise, which affect the sheet separation or the Removal of the sheets from the sheet feeder can be disruptive or even Could interrupt the operation. This initially applies to the permanent Tracking of the top of the stack opposite the sheet separation device, where a distance must be maintained within a tolerance range. Still applies this for the removal of sheets after the separation, since at the front edge of the sheet stack S or residual stack H control means, e.g. a so-called Arch flap are provided that release or block the arch path. A predetermined height tolerance must also be observed here so that the Leading edge of the sheet during removal by the pushing movement of the Trailing edge of the sheet does not strike and is thus compressed.

The pulling movement of only two remaining stacking bars 7 at the same time can also the position of the sheets in the sheet plane in the area of the stack union is not influence. Therefore, retention measures can damage the bow could be dispensed with.

In a further embodiment, not all of the Insert remaining stack support rods 7. So with very thick sheet materials, the due to its stability only slowly when pulling the support rods 7A increasing gap between the in the gap between sheet stack S and lower the remaining stack H, the spacer bars 7B are omitted. So that will the exchange process is accelerated because there is time to pull the spacer bars 7B is saved.

Likewise, support rods 7A can be omitted in pairs in the middle of the stack, so that the auxiliary stack H is immediately lowered onto the spacer rods 7B there. The adaptation process on the stack surface with respect to the separating device can be supported by first slowly lowering the pallet P.
The corresponding remaining stacking rods 7 do not have to be removed for these measures. It is sufficient to decouple or block the corresponding drive means. Of course, these remaining stacking rods 7 are then not inserted into the grooves of the pallet P before the stack change.

Claims (10)

1. Process for automatic continuous changing of a sheet pile (S) in a sheet feeder (2) on a sheet processing machine with a residual pile carrier device (3) which contains residual pile bars (7A, 7B) for timely receiving of a residual pile from a palette, for continuous raising of the residual pile (H) in the meantime and its subsequent deposition on to a newly introduced sheet pile (S) approaching the residual pile (H) from below, wherein the residual pile bars (7A, 7B) can be inserted into the pile region and can be removed again from the pile region at least staggered with respect to one another, characterised in that the residual pile is taken over over its entire surface, in that the residual pile bars (7A, 7B) can be moved in common below the residual pile and the residual pile is continually made to approach the sheet pile (S), in that the residual pile bars (7A, 7B) can be pulled out of the pile region in pairs starting from the centre of the pile and stepwise towards the outside to the side edges of the sheet pile (S).
2. Process for automatic continuous changing of a sheet pile (S) in a sheet feeder (2) on a sheet processing machine with a residual pile carrier device (3) which contains residual pile bars (7A, 7B) for timely receipt of a residual pile (H) from a palette, for continuously lifting the residual pile (H) in the meantime and its subsequent deposition on a new sheet pile fed in and made to approach the residual pile (E) from below, wherein the residual pile bars (7A, 7B) can be moved into the pile region and can be removed again from the pile region at least staggered relative to one another, characterised in that the residual pile is taken over over its entire surface, in that a first part of the residual pile bars (7A, 7B) takes over in common the residual pile to a first level, that the residual pile is continuously approached to the sheet pile (S), in that the first residual pile bars (7A, 7B) separately from one another can be pulled from the pile region from the centre towards the outside, that the residual pile (H) accordingly is deposited on a further portion of the residual pile bars (7A, 7B) so that the residual pile prior to unification with the sheet pile (S) is brought to a second level lying closer to the surface of the sheet pile (S), and that the residual pile is deposited on to the sheet pile (S), in that the second residual pile bars (7A, 7B) separately from one another can be pulled from the pile region from the centre towards the outside.
3. Device for changing a sheet pile in accordance with the process in Claim 1 in a sheet feeder (2) on a sheet treating machine with a main pile lifting unit for lifting and lowering a sheet pile (S), with a residual pile carrier device (3), which contains the residual pile bars (7A, 7B) for timely receipt of a residual pile (H) and its transfer to a newly fed in sheet pile (S), wherein the residual pile bars (7A, 7B) are provided with drive means for generating a longitudinal movement staggered with respect to one another, in such a fashion that they can be pushed into the pile region and at least can be removed staggered relative to one another from there, and a residual pile lifting unit (5) for lifting the residual pile carrier device (3), characterised in that the residual pile bars are constructed as carrier bars (7A) and as distance bars (7B) provided with respect to the carrier bars (7A) of lesser thickness, that carrier bars (7A) and distance bars (7B) are arranged alternating and that the drive means of the distance bars (7B) are rendered stationary or uncoupled.
4. Device for changing a sheet pile in accordance with the process in Claim 2 in a sheet feeder (2) on a sheet processing machine with a main pile lifting unit for lifting and lowering a sheet pile (S), with a residual pile carrier unit (3), which contains residual pile bars (7A, 7B) for timely receipt of a residual pile (H) and its transfer to a newly fed in sheet pile (S), wherein the residual pile bars (7A, 7B) are provided with drive means for generating a longitudinal movement staggered with respect to one another, in such a fashion that they can be moved into the pile region and are removable from there at least staggered with respect to one another, and a residual pile lifting unit (5) for raising the residual pile carrier device (3), characterised in that residual pile bars (7A, 7B) are provided of differing thickness.
5. Device according to Claim 3, characterised in that residual pile bars (7A, 7B) are provided of differing thickness and length.
6. Device according to Claim 3, characterised in that residual pile bars (7A, 7B) are provided of differing thickness in a symmetrical arrangement alternating across the width of the residual pile carrier device (3).
7. Device according to Claim 3, characterised in that residual pile bars (7A, 7B) of differing length and thickness are provided in a symmetrical arrangement alternating across the width of the residual pile carrier device (3).
8. Device according to one of Claims 3 to 7, characterised in that the residual pile bars are constructed as carrier bars (7A) and distance bars (7B) and that the carrier bars (7A) are thicker than the distance bars (7B), preferably approximately double the thickness.
9. Device according to one of Claims 5, 7 or 8, characterised in that the residual pile bars are constructed as carrier bars (7A) and distance bars (7B) and that the carrier bars (7A) are longer than the distance bars (7B) preferably by at least the dimension of the width of a residual pile lifting rail (14) of the sheet feeder (2).
10. Device according to one of Claims 3 to 9, characterised in that the lateral distances of the effective residual pile bars are variable in such a fashion that the particular driven carrier bars (7A) and distance bars (7B) or even all of the distance bars (7B) can be unlinked or rendered stationary.

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