DE8429978U1 - Storage table for printing machines with a device for marking individual print runs or partial stacks of printed sheets - Google Patents

Description

The present invention relates to a storage table for spinning machines with a device for marking individual editions or partial stacks of printed sheets according to the preamble of claim 1.

When printing in batches, i.e. when printing consecutively from different templates, it can happen that the individual partial stacks with the different print images lie directly on top of each other on the delivery table without the dividing plane between the individual partial stacks being easily identifiable. There are therefore various proposals in the state of the art for distinguishing these individual batches or partial stacks from each other. For example, the so-called swivel

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table storage, i.e. the storage table is slightly swiveled around its vertical axis at the end of a print run so that the subsequent printed sheets of the next print run (or the partial stack formed from them) differ from the previously printed print run by a slightly different storage angle. By alternately swiveling and swiveling the swivel table back, the individual partial stacks can be easily distinguished from one another. However, with such a swivel table storage it is not usual to design the table as a lowering table. It is also disadvantageous to have to make a not inconsiderable structural effort just with regard to the desired marking of the individual print runs, namely having to mount the table in a swiveling manner and having to provide the necessary adjustment mechanism.

It is also known to insert paper snippets between the individual copies to mark them. This has the disadvantage that the paper stack can become skewed and that additional equipment is required, i.e. a special strip insertion device must be provided at a suitable point on the machine, which can also lead to space problems. In addition, this solution can lead to particular difficulties if the delivery table is not designed to be gradually lowered, so that

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the 'otapel top is always in different places *

Based on this, it is the underlying invention!
j Task to further develop the arrangement mentioned above in such a way

&Idigr; den that even without a swivel table or a special

j Strip insertion device enables clear marking of the individual editions or partial stacks on the delivery table of a printing press. This should be done with as little technical or construction effort as possible, i.e. by making the greatest possible use of the construction elements of the printing press that are already present.

This problem is solved according to the invention by patent claim 1. By providing two stops arranged one behind the other in the direction of the sheet weft instead of one as before and by temporarily deactivating the first stop in the direction of the sheet weft, it is possible to achieve perfect marking of the individual print runs or partial stacks with very little additional construction or cost outlay. In comparison to an electronically controlled printing machine with only one stop on the gradually lowerable delivery table, for example, only one additional stop on the delivery table, which is set back in the direction of the sheet weft, is required.

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be provided, whereby the electronic printing machine control must be programmed in such a way that it issues suitable commands for the relative position change between the one (first) stop and the deposit table or the top of the stack. This is done either by causing the already existing drive for the gradually lowerable deposit table to lower the latter briefly in such a way that the top of the stack is located slightly below the lower (horizontal) end of the first or front stop, or this is done by the deposit table or the top of the stack in such a way that the

far from being changed in its position and instead the one (first) stop or its holder is adjusted in its (its) position in relation to the top of the stack, e.g. raised. This can be done in a very simple way

This can be done using an electromagnet, for example.

Such a solution is particularly interesting for (offset) printing machines with automatic printing foil or template changes, where different editions are produced in quick succession by the printing machine. The electronic control of the printing machine ensures that, in coordination with the printing foil change, the relative position of one stop in relation to the weft direction of the printing sheet or to the top of the stack is changed at short notice in such a way that for a possibly unprinted printing sheet

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the way to the next fixed stop is cleared, so that
In this way, a "separation sheet" is inserted between two consecutive editions. The inventive solution
is also possible without automatic printing foil or

Template change is interesting if, for example, it matters, §

to insert a separator sheet after each certain number of identical printed sheets have been stacked on the delivery table |

ßen, which does not even have to be unprinted. &Ggr;

In the attached drawings, two embodiments of the present invention are shown in a basic representation. The actual printing machine is omitted, since only the delivery table and the two stops are shown here .
and their arrangement or adjustability in relation to each other is important.

Fig. 1 shows the stacking table

while pressing a pad

(stack top at height N-N); ;

Fig. 2 shows the discard pile after completion \

a support (stack level lowered by the amount X from height N-N to

Longitudinal offset of the separating arch) (
Fig. 3 shows the discard pile before the start of your

new edition (stack level again on

Height N-N raised); and

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Fig. 4 shows the kinematic reversal of the embodiment according to Figs. 1 - 3. The top of the stack always maintains the level N-N, but the stop 2 is adjusted in the vertical direction if necessary (magnet, etc.) so that the gap Y for the longitudinal offset of the separating sheet is created.

Fig. 1 shows the delivery table with the delivery stack 4a on it in the position found during normal printing, i.e. the delivery table is gradually lowered in a manner known per se so that the top of the stack is constantly at approximately the height N-N. The printed sheets conveyed by the discharge roller pair 5 of the printing machine (not shown) onto the delivery stack shoot out in the direction of arrow 7 and then slide along the surface of the delivery stack up to the stop 2, which has a stop front part 2a and a stop rear part 2b. The front stop part 2a has a lower height than the rear stop part 2b, i.e. it extends less far downwards than the rear part 2b. In the normal operating position shown in Fig. 1 during ongoing printing, the incoming sheet stacks slide up to the stop advantage 2a&igr; On the opposite side of the discard pile (left in Figure 1) is a back*- and forth moving stack slide^-

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ber 6 is provided in the usual way, which ensures the formation of a proper stack by pushing any printed sheets that may rebound from the stop 2, 2a back against the stop.

The top of the stack is held at the height N-N in a known manner by a sensor. If this level is exceeded due to the continuously feeding in printed sheets, the delivery table 4 receives a command to lower to the specified height. This sensor can, for example, be a capacitive sensing element arranged in the stacking chipper, which is part of the height control for the delivery table 4. To the extent that the top of the stack rises due to the printed sheets placed on it, the control of the delivery table or the associated drive ensures that the delivery table is lowered during normal printing so that the top of the stack always remains at the same height.

The stop 2 with its front part 2a and the rear part 2b and their displacement in relation to the top of the stack represents the actual core of the invention. A stop 2 with the two stop parts 2a and 2b is attached to a holder 1, which are offset from each other by the amount Z in the sheet insertion direction . The holder 1 is horizontally

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The stop 2 is arranged to be displaceable in the direction of travel - for example by being mounted on a horizontal rod 8 provided on the printing machine - and can thus be adjusted to different sheet lengths. The holder 1 has a pin 9 which engages in an elongated hole 10 in the actual stop 2 and thus arranges this stop 2 so that it can be adjusted in height. Figure 1 shows that the stop 2 rests with its front part 2a on a previously inserted separating sheet and thus limits the forward movement of the subsequent printed sheets on the stack. The stop 2 rests with its own weight on the separating sheet protruding from the stack 4a via the front part 2a. However, it is also possible to generate or increase this load *, for example by means of a spring effect.

As can be seen from the drawings, the stop 2 with the front part 2a and the rear part 2b has approximately the shape of a fork with two prongs lying in the plane of the drawing, whereby the front prong (front part 2a) is somewhat shorter than the rear prong (rear part 2b).

In the embodiment of Figures 1 to 3, after

j termination of a support of the storage table 4 via a .'Control'·'-

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command by the amount X compared to the level N^N, so that a gap of height Y is created between the top sheet of the stack 4a and the lower (horizontal) end of the front stop part 2a. A printed or unprinted separating sheet that has been inserted at this time is only slowed down by the rear stop part 2b, which is offset by the amount Z in the insertion direction, so that a clearly visible separation of the various editions on the deposit table results due to the separating sheet protruding from the stack in the lengthwise direction. As soon as the separating sheet has been placed on the stack, the deposit table 4 receives the control command "upwards", i.e. the deposit table 4 with the stack 4a on it is moved upwards until the top of the stack with the separating sheet on it has reached the height N-N again (Figure 3). The stop advantage 2a rests on the separating sheet 3 that has just been inserted, so that sheets subsequently placed on the stack are again stopped by the stop front part 2a.

The same effect can be achieved by a kinematic reversal according to the embodiment of Figure 4.

To insert a separating sheet 3, the delivery table is not lowered by the amount X as in Figure 2, but the

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The stack side of the stack 4a is always kept at the level N-N and the stop 2 is instead raised by the amount X (Figure 4) via the holder 1 or the rod 8, in order to create a gap of height Y between the top of the stack and the lower horizontal end of the stop front part 2a. The next sheet to be fed in, whether printed or unprinted, will then protrude from the stack by the amount Z in the longitudinal direction, after which the stop 2 is lowered again in such a way that the stop front part 2a rests on the separating sheet 3 (according to Figure 3). The temporary raising of the holder 8 or the stop 2 connected to it via an elongated hole can be done by a magnet or the like and is not shown in more detail.

Another possible design - not shown - with the same effect consists in designing the holder 1, which can be moved longitudinally on the rod 8, in such a way that it takes over the effect of the stop part 2b and the stop part 2a can be moved vertically or actuated on the holder 1 (the latter again, for example, by means of a magnet).

As a further alternative, it is possible to arrange the front stop so that it can pivot around an axis parallel to the front edge of the paper stack, in order to achieve a short-term

To deactivate this front stop, so that a simple marking of the individual supports by means of a separating sheet protruding from the stack of supports is possible without any other constructional effort.

All that matters is the short-term relative displacement between the first or front stop and the top of the stack, whereas the second or rear stop is fixed, although it can be adjusted to different lengths of printed sheets.

HER/bm

Claims (1)

i _a mi &bull; · &bgr; ·« iia &Lgr; &bull;f«*· · · ■ li 4 ····· 1130 Dr. Weitend and «Partner '··'^; Lawyers Dr. Gerd G. Weiland Frank Dahrendorf Alexander Jahr Dr. Elisabeth Weiland Rolf-Dieter Klooß Norbert Parlow Ursel Kappelhoff Rudolf Dietze Herbert Dürkop New Rotaprint GmbH
Reinickendorfer Strasse 46 Berlin65 PROTECTION CLAIMS 1. Storage table for printing machines with a device for marking individual editions or printed sheet sections, which can be gradually lowered to adapt to the increasing stack height, with a stop (2) at the height of the top of the stack to limit the forward movement of the printed sheets running out of the printing machine in the weft direction (7), characterized in that a further stop is fixedly arranged in the weft direction of the printed sheets behind the one stop (2a) and that the top of the stack or the storage table and the one front stop (2a) are temporarily adjustable in relation to one another to clear the path of an incoming printed or separating sheet (3) to the further rear stop (2b). 2. Storage table according to claim 1, characterized in that the one front stop (2 a) is non-adjustable and the stack top or the storage table can be temporarily lowered relative to it. ...12 2000 Hamburg 36 · Neuer Wall 86 · PO Box 305847 Telephone 361307=0 · Teletex403541 weiland · Telefax 372274 · Telex 211365 weipä · GK 229 Conlmerzbank Account 37-32591 Bank code 20040000 Pe|fglr{)amttläm|jiur| 3II9I-2J& .$LiZ 20010020 D» \f(JI»ud nd tirtni &bull; BccMhiMht · &bull; · · · »tr 9 e - Storage table according to claim 1, characterized in that the one front stop is temporarily adjustable and the stack top or the storage table is meanwhile changeable in its height. 4. Storage table according to claim 3, characterized in that the one front stop is mounted so as to be longitudinally or transversely displaceable or pivotable. 5. Storage table according to claim 3 or 4, characterized in that the one front stop is adjustable by an electromagnet. 6. Storage table according to one of the preceding claims, characterized in that the one front stop (2 a) is suspended so as to be vertically adjustable for resting on the dividing arch under its own weight via a lost motion connection (long hole 10). I &diams; Iff #« · 4 *«*« * ·