DE2646950A1 - METHOD AND DEVICE FOR STACKING CUTS - Google Patents

Description

3 26AB9oO

PATENT LAWYERS

Dipl.-Ing. P. WIRTH Dr. V. SCHMiED-KOWARZIK Dipl.-Ing. G. DANNENBERG ■ Dr. P. WEINHOLD Dr. D. GUDEL

281134 '. 6 FRANKFURT AM MAIN

TELEPHONE (0611) " _: .

287014 CJH. CSCHENHEIMF-R GTRASSE 3B

October 15, 1976

Gu / Schu Pall I

Universal Corrugated Box Machinery GmbH
Justus-Liebig-Strasse 6051 Ober-Roden

Method and device for stacking blanks

The invention relates to a method and a device for stacking flat-folded> glued blanks _f the sequentially counted on a conveyor track conveyed to a height-adjustable stacking table on which they are deposited aligned, wherein after reaching a predetermined number of data stored on the stack blanks which then next conveyed blank is deposited on a support independent of the stacking table and located above the stacking table until the stack formed underneath has been transferred from the stacking table to another conveyor track.

Such a method and apparatus are known from Grobman's US Pat. No. 3,892,168. there

809818/0411

are located on the downstream side of the stacking table, viewed in the conveying direction of the stacks Fingers that are placed in the fall path of the blanks falling from the conveyor track onto the stacking table and from the Fall trajectory can be withdrawn. A blower is provided above the stacking table, which blows on the stack and thus presses the topmost blank onto the blanks below.

To form stacks of a counted number of blanks, the fingers are moved out of an upper, extended waiting position pivoted into the fall path of the blanks, so that the continuously further conveyed blanks -now on the Fingers fall. The stack formed under the fingers on the stacking table can therefore be ejected in the conveying direction will. The ejector piston is then moved back to its starting position and the stacking table is in its upper position The starting position is raised and the fingers are withdrawn, pivoted upwards and in this upper position in the mentioned position Starting position pulled out »When the fingers are withdrawn from the trajectory of the blanks, the one formed on the fingers becomes Partial stack deposited on the raised stacking table < During the subsequent movements of the fingers to complete the cycle, the stack continues to be formed until by sending the signal mentioned, the pingers can be swiveled back into the fall trajectory, etc. «

It is particularly disadvantageous that for the mentioned Cycle of pivoting movements and drawing in and pulling out movements of the fingers requires a relatively long time. The dem Stacking table feeding conveyor can therefore only work at a certain maximum speed, which is not may be exceeded, because otherwise a new stack will be formed sooner than the fingers return to the starting position

■ st

$ 09818/0411

have been returned. With today's conventional conveying capacities of such machines of about 18,000 sheets per hour and with the time specified in the cited US patent specification for the completion of a cycle of ^s j seconds, the result is that stacks of 23 and more sheets can be counted with the known machine * ISs is therefore not possible to form stacks with a smaller number of sheets or «precisely counted blanks, unless the conveying capacity of the machine is reduced accordingly«

The invention avoids these disadvantages based on proposing a method and a device for stacking flat-folded, glued blanks, which while maintaining the maximum conveying capacity of today's machines through a high counting accuracy and the The ability to create stacks with a smaller number of blanks is also possible with counting accuracy.

Based on a procedure of the aforementioned] Art this is achieved according to the invention in that the respective lowermost blank of a new stack to be formed is opposite the other blanks are placed laterally offset on the support, which then the offset blank in its entirety submits and carries.

These movements can take place very much faster than in the previously described method. Because it is only necessary, the continuous on the conveyor track with possibly the maximum conveying speed Machine conveyed blanks to count and after reaching a preselectable number the next cut to arrive in the specified way laterally by a small amount Measure to offset, so that next this laterally offset blank is placed on the support that up to has not made any movement at this point in time.

-4 809816/0411

The support therefore undergoes the laterally offset blank at that edge which is opposite to the other blanks is offset laterally. It is in its normal waiting position, so close to the continuously formed pile. Only when the laterally offset blank is on the support with the edge pulled out to the side has settled, the support performs a movement in such a way that it grips under the entire blank and thereby to Fully carries. During this time, the conveyor track continuously conveys the blanks that are on the underside Blank are continuously deposited via a stop becomes at the same time or afterwards * d.b, during the filing the continuously conveyed sheet on the bottom blank, this bottom blank around the offset piece brought back so that all blanks are placed on the support stacked on top of each other.

During this time, the counted stack formed tinter aem offset blank was ejected so that - similar to the previously mentioned previously known method - the stacking table can then be raised again to its starting position. The cycle then begins all over again. In contrast to the previously described method, however, in the present invention the stacking table is not lowered continuously, but in stages, which results in a more precisely aligned stack.

The device for carrying out the method is characterized in that the support is a pair of controlled-driven ones Has chains that are laterally next to the stack to be formed and parallel to the displacement direction of the laterally offset blank are located, and on which protrude into the area of the stack at a distance from each other There are blocks. This significantly reduces the time it takes to complete a cycle, because only both chains need to be driven until

809816/0411

the mentioned blocks from the mentioned waiting position directly next to the stack that is being formed are completely driven under the fall path of the blanks. The distance between the chains is namely chosen so that the blanks can pass freely fall between the chains _t if neither of the blocks are in said dropping track. Only when the blocks have been brought into the fall path by a predetermined amount of movement of the chains do the blocks form the support for the continuously conveyed blanks. Several rows of such blocks can be attached to each chain so that the chains only need to be moved a fraction of their length to complete a cycle. For this reason, it is preferred if a section with chain links with blocks is followed by a section with chain links without blocks, the length of the sections corresponding approximately to the width of a stack «

Another preferred device for carrying out the method is characterized in that at the end of the conveying path the conveyor track a pair of rollers is arranged, which is controlled displaceable in the axial direction. This will in a structurally simple manner and very quickly the 'mentioned lateral displacement of the relevant, paid blank achieved.

Furthermore, it is preferred if, as a hold-down device above the stacking table, a driven one inclined with respect to the horizontal Tape is provided, which pulls the topmost blank on the stacking table to a stop. This The hold-down device works significantly better than the fan in the aforementioned US patent. This is especially true for Smaller format cuts. In addition, the hold-down device according to the * invention prevents the splice of the can open the top boxes. Also will be the top

809816/0411

- S, - g 264695Ü

Tabs of each folded blank were drawn towards the stop via the powered belt, thereby improving one Folding the blanks results. Instead of the driven belt, one or more driven rollers can also be used be provided.

The invention is explained in more detail below with the aid of an exemplary embodiment from which further important ones emerge Features result. It shows:

Fig. 1 - schematically in a side view, the essentials Components of a device according to the invention;

Fig. 2 - the middle part of this device with the Stacking table and further details in a view corresponding to FIG. 1 on an enlarged scale;

FIG. 3 - a section along III - III of FIG. 2.

Fig. 4 - in a plan view of a modified imple mentation form the output side of the device can be swiveled Tying unit.

Glued and folded blanks come from a folding section, not shown in the drawing, for boxes in the conveying direction 1 of the machine to a front table 2, on which they are conveyed up an inclined path. This is a driven belt 3 is provided, which has a number of idle rollers 4 drives that form a conveyor track for the blanks. Located above the row of idle rollers 4 a plate 5, which is suspended from arms 6. The blanks are so between the top of the row of Idle rollers 4 and the underside of the plate 5 conveyed « The arms 6 are pivotably attached to a part of the machine frame 7.

The blanks arriving along this conveyor track in the direction of arrow 1 are counted by a photocell 8. An in The conveying direction of the last pair of rollers 9 can be controlled via an electromagnet, not shown, in the direction perpendicular to the Paper plane of FIG. 1 shifted by a predetermined distance

809816/0411 ~ 7

will. In the Pig's view, 3 this is to the right.

The continuously conveyed blanks are then placed on a height-adjustable stacking table 10 (see also Fig. 2), they are conveyed against a back stop 11 brings. Stops are also provided laterally, of which FIG. 3 shows an adjustable stop 13. The distance of the stops from each other is adjustable to the "respective format of the conveyed blanks. The stacking table 10 is lowered a certain number of stacked blanks at a lower level when it reaches _f in which its upper side with the upper side of a transfer table 14 is aligned. A plunger 15 pushes then the counted stack formed on the stacking table 10 in the direction of arrow 1 onto the transfer table 14 * where this ejected stack conveys the other stacks on the transfer table by one width at a time.

The thus formed, counted stacks 16 are kept aligned by means of a guide bar 17 extending parallel to the transfer table 14. You then come to. a tying unit 18 which can be displaced adjustably in the direction of arrow 19. The Umsclinureinhe.it has a work table 20 which is arranged at a distance from the end of the transfer table 14. As a result, a gap 21 is formed between the tables 14 and 20, via which the tying unit can tie around the stack 16 located approximately in the middle above this gap with a suitable band. "

So that the tying up of the stacks 16 each in the middle Can be done stack, the Umsohnüreinheit 18 is in the direction of the arrow 19 slidable and adjustable. The transfer table is telescopic for this length compensation,

809816/0411

_What follows from what has been said? that the top of each bundle is at a constant height. The bundles are above the height-adjustable guide bar 17 'under the appropriate pressure so that the individual blanks in the bundle cannot slip. It is practical, contrary to common practice, to arrange the closure element of the constriction over the bundles. In addition, the tying unit can be rotated 90 °. This allows the bundles to be tied lengthways or crossways.

For this purpose, Figure 4 shows an arrangement of _f at aer the Umschnüreinheit 18 about a horizontal axis 22 in the broken line position is pivotable, in the direction of arrow 23. The transfer table (4 is for this reason -. As well as the guide rail 17 - continued rectangular. A slide 24 pushes a stack in front of it without pivoting onto the L-shaped continuation 25 of the transfer table 14, where the stack can then be tied in the longitudinal direction with the tying unit 18 pivoted.

In the following the details of the operation of the support formed by chains are explained in the region of the stacking table 14, in particular with reference to the figures 2 and 3. FIG. In the conveying direction 1 in front of and behind the stacking table 10 there is a driven, endless chain 26. Blocks 27 tapering towards the front are attached to the chains Stack 16 corresponds, followed by chain links without such blocks, followed by such a row with blocks, etc. This is shown in FIG. Both chains are driven synchronously by a motor 28 and a drive shaft 29 as well as a belt drive 30 with a toothed wheel 51. The row of blocks 27 and the chain links are without such blocks

"9 809816/0411

both chains 26 are provided at the same points in each case. The chains are driven in the direction of arrow 32. Figures 2 and 3 show a position of the chains in which a row of the blocks 27 is located in the downward path of the blanks, so that the previously over the pair of rollers 9 laterally The lowermost blank drawn out and all subsequently conveyed blanks rest on the blocks 27. In the The aforementioned waiting position of the chains 26 is the foremost block of each row of blocks just before the edge of the stack formed underneath, so that the one mentioned laterally The pulled-out blank falls on this pair of blocks with its pulled-out edge. Then both chains driven very quickly and synchronously in the direction of arrow 32, so that the position shown in Fig. 2 and 3 is reached, in which a stack can form over the blocks, over this stack is a hold-down that orders from a driven belt 33, which the blanks in Direction of arrow 34 to stop plate 12 promotes. The tape 33 is over a further belt 35 and this again by one driven shaft 36 driven.

The method of operation of the machine described is therefore as follows, reference being made to the preceding description of the example. The incoming from the Faltpartie _f glued and folded blanks which are later to produce folding cartons are conveyed in P.feinrichtung 1 and counted by the photocell. 8 The photocell forwards the impulses to an adjustable addition counter. If the number preselected on this counter has been transported through the pair of rollers 9 and the photocell 8, the counter emits a reset pulse. This pulse causes the pair of rollers to perform a corresponding lateral movement. The next cut of the next bundle is thereby moved laterally. In the stack that is being formed, each bottom blank of the new stack protrudes laterally,

-10 809816/0411

This stack is built up on the stacking table 10, which can be moved vertically up and down. To the extent that new ones from above If blanks are delivered, the stacking table is steered downwards. The newly arriving blanks on the stack are guided up to the back stop 11, which can be set accordingly for the format to be processed * The The top sheet is printed downwards by the hold-down j53. The hold-down device also punctures the pre-alignment of the blanks. The actual alignment takes place in a tried and tested manner in that the stacked blanks are pressed against the stop 11 by the oscillating plate 12 will.

The lower part of the stack must now be aligned, counted Bundles are ejected. As a result, this bundle is removed from the rest of the stack by pushing in the blocks 27 separated. The distance between the chains 26 is slightly larger than the stack size, so that the stack between the chains is unimpeded can be steered down. When lowering the stacking table with the stack, the counted one is supported on the side cut forward on the first block of each row of blocks on the chains .26. The Stacking table moved a little lower, creating a gap between the preceding blank and the stack going down Gap arises. The chains start now and pull the blocks with their pointed ends into the emerging ones Gap. So that the blocks do not drag along in their running direction, there are controlled blanks on the opposite side of the stack Stops 13 are provided. After the blocks have been drawn in, the upper part of the stack rests fully on the blocks while which is separated under part for ejection. The ram pushes the bundle out in the machine's direction of travel and pulls it immediately returns to the "starting position". The stacking table and the chains are raised again by the height of the bundles that have become free continue for the length of a row of blocks. The upper part of the stack of

$ 09816/0411 -11

stripped off the blocks and slipped onto the stacking table, so that the next cycle can begin.

The bundle was ejected onto the transfer table 14, which is directly attached to the stacking table * The transfer table preferably has an upper side which consists of a smooth sheet metal. Further treatment of the outcast Bundle has already been explained above,

Manufacturers of tying units are e.g. the following companies:

Ämpag GmbH + Co. KG
P.O. Box 50 11 80
5000 Cologne 50

Legamatic SNC C-O

INTECMA

Corso di Porta Vittoria 18

I - 20122 Milan

0. Siebeck OHG
Packaging machines
P.O. Box 60
6930 Ebersbach

Signode made of dry goods
Packaging and labeling PO Box 16
Johannesgasse 2.3
A - 1015 Vienna.

- Expectations

809816/0411

Claims (5)

Gu / Schu Universal Corrugated Box Machinery GmbH 6051 Ober-Roden Case I Patent or protection claims 1. Method of stacking flat-folded, - glued Blanks that are counted one after the other on a conveyor track and conveyed to a height-adjustable stacking table on which they are placed in alignment, after reaching a predetermined number of on the Stacks of blanks deposited then the next conveyed blank on an independent of the stacking table and the support located above the stacking table is deposited until the stack formed underneath is removed from the stacking table has been given to another conveyor track, characterized in that the each Bottom blank of a new stack (16) to be formed is laterally offset from the other blanks is placed on the support, which then grips and carries the offset blank in its entirety. 2. Device for performing the method according to claim 1 , characterized in that the • support has a pair of controlled driven chains (26) which are located laterally next to the stack to be formed (16) and parallel to the direction of displacement of the laterally offset blank, and on which are spaced apart in the area of the Stack protruding blocks (27) are. 809816/0411 3. Vorrichtlang according to claim 2 _f characterized in that on a section with chain links with blocks (27) is followed by a section with chain links without blocks, wherein the length of the sections corresponds approximately to the width of a stack. 4. Device for performing the method according to claim 1, characterized in that on At the end of the conveying path of the conveying path, a pair of rollers (9) is arranged, which are controlled in the axial direction is movable. 5. Device for performing the method according to claim 1, characterized by> that as a hold-down device above the stacking table (10) a driven belt (33) inclined to the horizontal is provided, which pulls the top blank on the stacking table to a stop, 809816/0411