DE1199602C2 - DEVICE FOR CROSSING, SLITTING AND TRIMMING RECTANGULAR, FINISHED CUTS FOR FOLDING BOXES, FOLDING CONTAINERS OR THE LIKE - Google Patents

Description

The invention relates to a device for transverse grooving, slitting and trimming of rectangular, Cut to size for folding boxes, folding containers or the like with blunt butting closure flaps, with two pairs lying one behind the other in the working direction rotating rollers, one of which is tools for trimming the sealing flap and the other carries other tools for slitting.

When erecting a folding box from a rectangular one with fold lines and slots Blank, the opposite end edges of the blank are generally stapled or fastened to one another in some other way, so that one is rectangular in cross-section, but with open Ended box is formed, whereupon flaps formed at the ends of the box are folded in to form the top and bottom of the folding box. The ones on the top and lower edge of the four folding box walls existing flaps that form the base and the lid should form, designed so that all four upper and lower lobes are the same length. In general two tabs from the fold line to the free end edge each have a length half that is as large as the dimensions of the bottom or the lid of the folding box, so that the against each other give the adjacent end edges of the flaps of the folding box a certain strength. If the other two Tabs on the same base or lid of the folding box are the same length, then overlap the two end edges mutually, or there is a space or a gap between the two end edges, so that no support or stabilization can be achieved.

In British patent specification 587 129 a method is described in which two of the lobes be shortened so that both pairs of flaps on both the bottom and the lid of the folding box Edge to edge butt against each other (»buttflap cutting«).

This procedure is used relatively often in the manufacture of folding boxes.

The device proposed in British Patent Specification 587 129 consists of a whole Series of pairs of rollers arranged in such a way that the first pair of rollers grooves the cardboard, which extend in the direction of the inserted blanks through the device and thus fold lines Form between the adjacent side walls of the folding box. The second pair of roles of these Device slits grooves in the transverse direction, thus forming fold lines between the walls and the rag. The third pair of rollers of the device is provided for slitting, each lobes separated from the adjacent lobes on each side. The fourth and fifth pairs of rollers are used for printing, and the last pair of rollers is provided with cutters to to shorten the flaps and thereby achieve the so-called »butt flap cutting«.

The one described in British Patent Specification 587129 Apparatus does not provide satisfactory results under today's machine conditions Folding boxes, as modern machines producing folding boxes run much faster and no precise trimming of the blanks can be achieved with the device described can. It has been found that in most cases the flaps are trimmed too short or too long causing overlaps or spaces between the lobes.

It is believed that the inaccuracies arise from the fact that the various blanks are not gripped in the same way in the different roller pairs. For example the blanks are stacked before being introduced into the device, so that those in the lower part of the stack located blanks are partially compressed and a smaller one Have a diameter than the normal blanks, which means that they pass through the device more quickly. Due to the storage, blanks can be in the upper or in the lower part of the stack bend or warp, causing delays when a blank hits a nip reached before the blank has become sufficiently flat again.

These difficulties can vary depending on the material used appear. However, they play with the device described in British Patent No. 587129 plays a big role, since the trimming process is done as the last operation and the

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Possible errors up to this point and trimming of rectangular, to finished size

add. brought blanks for folding boxes, FaIt-

US Pat. No. 2,164,436 describes a container or the like with a device butt against each other for rotary printing trimming, with the closing flaps, with two in the working direction the thin cardboard box from a continuous 5 consecutive pairs of rotating rollers, Belt in a single pair of treatment rollers, one of which is a tool for trimming cut and grooved. As in this device, the flap and the other tools only a single pair of rollers is used for slitting, which is characterized by there is almost no risk of displacements occurring in the material which is to be moved in the working direction, the first pair of rollers knife-cutting, ίο and abutments for trimming the closure die Device is only suitable for thin flaps and the tools for transverse grooves and that Cardboard material, which in a continuous pair of rollers, the tools for slitting Tape can be rolled up and does not carry thicker ones as well as garbage grabs.

and harder cardboard materials. The so-called In a preferred embodiment of the

"Butt flap cutting" is thin cardboard material according to the invention, the knives exist

materials useless, since the abutting end from cutting blades held in slotted strips

edge the flaps a certain thickness of the cardboard, which increases over the length of the creasing rollers.

Require cardboard to stretch the appropriate and on these are adjustable.

To gain effect. In another preferred embodiment

2 164 436 boxes shown are trough-shaped *> of the device according to the invention are the

Boxes that are made without a lid and designed as sawtooth blades, for which hard,

presumably should be pushed into each other. The flexible cutting sticks on the opposite

Side walls are assigned roller from the base part or bottom part.

folded away. In the U.S. Patent In another preferred embodiment

2164 436 shown device is a template as according to the invention, the cutting sticks consist of

required, which are manufactured separately and attached to the whale rubber or foamed plastics. At a

zenpaar must be attached. The shape and the further preferred embodiment of the device

Dimensions of the box are determined by the arrangement according to the invention, the device for

tion of the cutting knife on this template dib- Removal of the cut pieces from a

animals. Shall boxes of other sizes made from 30 bed of nails or from spikes to which scraper blades

then the full template of must be assigned.

the pair of rollers are removed in contrast to the waste gripper in the device according to the the invention described in British patent specification 587 129 can consist of a bed of nails or of benen device in which you have different corresponding tips or spikes in addition to the Setting size ranges can consist of 35 slotting knives or wheels by means of modification. On them the tool arrangement on the individual rollers, the cut pieces are impaled, the mate. In the device described above then be stripped off later. This is how it came into being also a lot of waste. fahr eliminated that the pieces on the blanks

In US Pat. No. 1 977 812, there is a retention and disrupt the following operations. the

Direction described, the 40 separate pieces also do not stand up and come

Roll pairs consists, around a certain grooves, between the device. At high speed

Slitting and printing. This precedence working devices, through the two

direction is designed so that one setting or, for example, 12,000 cuts per hour run is

Regulation of the angular position of one creasing mechanism - this is essential to ensure uninterrupted operation

tool around the pair of rollers is accompanied by a 45 to achieve.

similar adjustment of the angular position of a with the device according to the invention can Slot tool around the adjacent pair of rollers. Cut to size for folding chess if Use the device to subdivide a blank or the like so that the blunt Different size is to be processed and an abutting closure flap with different sizes Dimension between parallel 50th accuracy meet, namely on The grooves that make the folds are necessary for the following two operations: The snow-making flap on the bottom and on the top of the folded layer the ("butt flap cutting") itself and the grooves that are to form, then the slots are arranged so the length of the tabs are determined on the net that they performed on the lines of the corresponding RiI- same pair of rollers, so that a Verlen end and continue to end at these crease lines, 55 slip or shift the blank between even if the crease line arrangements in relation to the trimming process and the creasing process is adjusted to the leading edge of the blank. is completely eliminated. Second will be this The so-called »butt flap cutting« is in these operations at the beginning of the processing by the device not planned at all. guided so that a possible slipping of the feed

The invention was therefore based on the object of providing a device for transverse grooving, slitting and cutting when machining in the second pair of rollers.
In the following description, the devices blanks for folding boxes, folding containers device according to the invention with reference to the figures in the od.

the accuracy, at high speed. 65 Fig. 1 shows a schematic view of a paperboard

works and material scrap is avoided. processing device according to the invention;

This object has been achieved according to the invention FIG. FIG. 2 shows a side view of one of the FIGS. 1

pairs of rollers represented by a device for transverse grooving, slitting;

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F i g. 3 shows a partial top view of the pre-shortening of the flaps, representing the last work step,

direction, and with the device according to the invention is the

F i g. 4 shows a blank. Cut to shorten the flaps, d. H. the snow-making

First of all, in FIG. Figure 4 shows a typical blank along the lines 24 with the same roller which can be erected into a folding box 5 pairs, as the creasing of the folds 12 and 13 can be accomplished. Before it is positioned by the device and essentially carried out before the point in time, the blank is rectangular and has been guided in which the pair of rollers carries out the slitting of lines 14 to 21 in the direction of arrow A and transversely to this. As a result, not only is the length and a width that correspond to the overall dimensions of the number of roller pairs (which already corresponds to a remarkable finished blank. Although this is not essential savings in capital costs, operating costs, but this assumption means that repair costs and necessary space are easier) following description. diminished, but there will be additional benefits

Before introduction into the device or at one of the tolerances required for the realization or earlier or later point in time within the precision limits which, at high speeds, the cut along the four parallel lines 15 must be adhered to is reached. In part, this is the sequence of dash-dotted lines 11 grooved; This can be done with the fact that the dimensions χ and y are obtained from the same pair of rollers produced in the corresponding creasing rollers or thereby, the same pair of rollers and cutting that the blank transversely to the direction of the arrow A th result, so that a slip or the like. Between on through a per se known creasing device is eliminated and is guided by successive pairs of rollers. ao partly it arises from the fact that these cuts too

In the cut shown, creasing lines must take place earlier in the production process

along the dashed lines 12, 13 transversely to the additional later, so that adding

guidance direction can be switched off by the device with the help of errors. Furthermore, the development

are formed by creasing or compression strips, and removal of cut pieces when realizing

there are slots at both ends of the blank as the disclosure of the invention more easily accessible, which is later

namely, slots along lines 18 become clear.

through 21 at one end and slots 14 through 17 at the end of FIG. 1 points the device to the other end of the blank. F i g. 4 shows this invention essentially two pairs of rollers 30 and 31 blank in a state in which it is only partially open, the first of which is processed for shortening the tabs 22 at the front end and at the other 30 and for producing the grooves 12, 13 and the second end is machined. The lines 11 give the creasing is used for slitting. It is most clear from FIG. 2 lines again when the blank becomes one in the transverse direction that the pair of rollers 30 is erected from two cylindrical sections, and which consists of the one of which the upper two creasing or lines 14 to 21 are dividing lines between the lap upsetting grooves 32, 33 and two projecting ones, the Verpen 22 and the end tabs 23, which are folded to form 35 closing tabs cutting knives, ie blades 34, 35 bottom and lid of the folding box. One of the creasing tools is a must. The dimensions of the tabs can be adjusted to allow the distance between the bending lines to be changed, dimensions of the box parts in FIGS. 12 and 13 (FIG. 4). Each blade is coordinated, ie the wider box side 34, 35 is 2 y wide on the circumference compared to the one facing it, where y is the dimension of the flap 23 40 arranged creasing tool adjustable. The length of each from the fold 12 to the free edge results, so that with itself the cut 24 and its position in relation to the lobes supporting one another with their edges axis of the roller pair is also after loosening 23 at this end of the folding box the edges of known clamping devices adjustable flaps are directly opposite each other. In cash. The areas adjacent to the tools are the same as the narrow rollers are covered with rubber blocks, which when measuring the box 2 x, where χ indicates the degree of mutual engagement of the rollers compressed flaps 22 from the fold to the free edge. and spring back to the cardboard

This latter condition requires a cut to be stripped of the tools,

cutting the part between line 24 and the lower roller in FIG. 2 carries two creased or

free edge of the blank to the flaps 22 to 50 compression strips 36, 37 and two cutting strips 38, 38 a.

shorten so that they can be adjusted with respect to the roller axis, as described above, without

to overlap, butt meet, and what is possible in the case of the cutting strips 38, 38 a-

this enabling cut is the further in the way by their attachment with adhesive, but in the

Device carried out operation. Case of tools 36, 37 by a synchronous

It can be seen that the lower part of the drive is reached, which allows when

cut essentially according to the illustration a recessed creasing tool relative to the other

according to FIG. 4 is not new per se and is actually removed, the associated tool accordingly

Corresponds to blanks that move in known Vorrich-. Such a synchronous drive is in itself

lines are produced by known methods, known; it is not the subject of the invention and

after initially rotating grooves the folds 60 need no description.

11 formed, the folds 12 and 13 as the second after the in the direction of the cut, through

placed, as the third along the lines 14 to 21 seen the roller pairs 30, 31, front edge of the

slits and fourth, the shortening blank just explained has run through the pair of rollers 30,

the lap later supported edge to edge, it runs between the pair of rollers 31, which the

pen is carried out, all of this with one being made 65 slots along lines 14 to 21, wherein

special pair of rollers and very often with between it can be practical, the running-in of the blank

the third and fourth operations switched on in the pair of rollers 31 to make so that in the-

Pressure rollers is carried out, so that actually this moment the trailing edge of the blank

is still detected in the pair of rollers 30. Again, slot devices are known and required hence no particular description, except for the fact that they are made up of pairs of Knife and groove strips 39, 39 α exist, which are adjustable about the roller axis in order to meet the requirements of the cut to be coordinated. A number of knife sets are along the roll axis arranged, one set being provided for cutting each slot. Between the sets of knives can the roller has blocks or buffers 40 which cooperate and grip the pieces between them,

which are cut off when the slitting knives cut the edges of the lobes and in doing so along the Cutting lines 24 run. One of each pair of blocks has spikes (barbed if necessary) or waste grippers 41 which impale the cut parts in order to remove them around the roller axis the level of the blank and to guide a doctor blade with respect to the Vorrichrichtung is firm and serves to hold the parts in place while the spikes pull out of them, whereupon the parts fall on a conveyor 42 a to guide them away.

For this purpose 3 sheets of drawings 409 646/324

Claims (5)

Patent claims: 1. Device for transverse grooving, slitting and trimming of rectangular, finished dimensions Brought blanks for folding boxes, folding containers or the like with butt against each other butting closure flaps, with two rotating pairs lying one behind the other in the working direction Rollers, one of which has tools for trimming the sealing flap and the other Carries tools for slotting, characterized in that the in the working direction first pair of rollers knife and abutment for trimming the sealing flaps and the tools for transverse grooves and the other pair of rollers, the tools for slitting and waste grabs wearing. 2. Apparatus according to claim 1, characterized in that the knife is slotted out in There are bars held cutting blades, which extend over the length of the creasing rollers and are adjustable on these. 3. Device according to one of claims 1 or 2, characterized in that the blades are designed as sawtooth blades, which hard, but flexible cutting strips on the Counter roll are assigned. 4. Device according to one of claims 1 to 3, characterized in that the cutting strips consist of rubber or foamed plastics. 5. Device according to one of claims 1 to 3, characterized in that the device consists of a bed of nails or spikes to remove the cut pieces, to which scraper blades are assigned.