EP2113374B1 - Folding box gluing machine for manufacturing folding boxes made from blanks - Google Patents

Description

The invention relates to a folding box gluing machine according to the preamble of claim 1.

• Einen Einleger, der die zu verarbeitenden Zuschnitte mit hoher Geschwindigkeit aus einem Stapel nacheinander abzieht und einzeln der nachfolgenden Bearbeitungsstation zuführt,
• eine Faltstation, in der die mit einem Klebestreifen versehenen Zuschnittteile zur Herstellung einer Klebeverbindung um 180° umgelegt, also gefaltet werden,
• eine Überleitstation, die die gefalteten, mit noch nicht abgebundenen Klebenähten versehenen Zuschnitte in allen Teilen exakt ausgerichtet der nachfolgenden Sammel- und Presseinrichtung zuführt und
• eine Sammel- und Presseinrichtung, in der zunächst ein Schuppenstrom aus gefalteten Zuschnitten gebildet wird, der anschließend zwischen Pressbändern für einige Zeit unter Druck gehalten wird, damit die Klebenähte abbinden.

Folding box gluing machines for producing folding boxes from blanks have, as is known, at least the following processing stations:

• An inserter which pulls the blanks from a stack one after the other at high speed and feeds them one by one to the following processing station,
• a folding station in which the blank parts provided with an adhesive strip are folded by 180 °, ie folded, to produce an adhesive bond,
• a transfer station, which supplies the folded, provided with not yet bonded adhesive seams blanks in all parts exactly the following collection and pressing device and
• a collecting and pressing device, in the first a shingled stream of folded blanks is formed, which is then held between press belts for some time under pressure, so that the adhesive seams set.

The blanks are conveyed through the individual stations by driven conveyors. As driven conveyor two or three conveyor belt pairs are used, which are arranged with transverse spacing so that they lead the blanks from above and below holding.

It is known to arrange a discharge device in the transfer station in order to discharge it as defective detected boxes before the shingled stream of boxes is produced at the beginning of the collecting and pressing device. Through the Überleitstation the boxes are still individually and at a distance from each other promoted, so that a single box can be pulled out of the machine. Defective boxes include, for example, boxes that are not adequately glued, boxes that contain folding errors, or boxes that are identified as not belonging to the job during an identity check. As conveying elements, the transfer station has at least two pairs of conveyor belts each consisting of an upper and a lower belt.

In order to remove faulty folding box blanks or folding boxes from the flow, internal Ausschleuseeinrichtungen are known from the prior art in addition to external discharge devices such as plate and Linearauswerfern.

Disc and linear ejectors are devices which are arranged outside next to a belt pair, which serve as conveying elements in the transfer station. These engage on a outside over the belt protruding box part to pull the faulty box between the conveyor belt pair to one side. Such plate and linear ejectors are used in the DE 10 2004 022 211 A1 described as known. Furthermore, a specially designed course of conveyor belts is proposed in order to be able to remove defective boxes more easily from a folding box gluing machine.

In contrast, the transport path is interrupted by a switch device in internal discharge devices. By deflecting the transport path can be deflected up or down, so that the deflected box blanks are discharged. Such an internal ejection device is for example from the DE 698 16 717 T2 known. A disadvantage of these known internal Ausschleusevorrichtungen is that the maximum possible discharge speed due to the physical conditions below the maximum to be processed blank quantity per unit time.

For external Ausschleuseeinrichtungen, as mentioned, as means for pulling out the boxes so-called turntable ejector known that contain a driven at high speed and reaching below the projecting box parts turntable and arranged above clamping elements. In case of a faulty box this is clamped with the clamping elements on the turntable and pulled by the rotation of the machine. Such a device is in the DE 102 24 814 A1 described. Turntable ejectors are reliable and require little construction, but are only suitable for small to medium sized boxes.

Larger boxes are ejected by so-called linear ejector, as in the EP 0 557 609 A1 are described. They contain belt conveyors, between which the boxes are clamped and removed straight from the machine. Linear ejectors require a high construction cost.

Both disc ejectors and linear ejectors do not allow the reliable removal of folded bottom boxes, 4-point boxes, 6-point boxes or boxes with complicated geometries. For these types of boxes, it makes more sense to use internal Ausschleuseeinrichtungen.

The object of the present invention is to provide a folding box gluing machine with which faulty blanks can be reliably removed by utilizing the optimum machine speed.

This object is achieved by a folding box gluing machine with the features of the characterizing part of claim 1.

The folding box gluing machine contains, in addition to an internal ejection device, at least one further external ejection device. The respective ejection devices can be controlled depending on the box type and / or the desired operating speed for discharging defective carton blanks.

With this device, it is then possible to use the already described advantages of the individual ejection devices and moreover to combine the advantages.

In a particularly preferred embodiment, the discharge devices are equipped with independent individual drives. This allows the different ones To design Ausschleusevorrichtungen as modules, so as to build the Faltschachtelklebemaschine optimally and flexible.

The invention will be explained in more detail with reference to the embodiments illustrated in the drawings.

Fig. 1

eine schematische Seitenansicht einzelner Stationen einer Faltschachtelklebemaschine

Fig. 2a, 2b

zeigen eine schematische Darstellung eines bekannten Linearauswerfers

Fig. 3

zeigt eine schematische Darstellung eines bekannten Tellerauswerfers

Show it:

Fig. 1

a schematic side view of individual stations a Faltschachtelklebemaschine

Fig. 2a, 2b

show a schematic representation of a known Linearauswerfers

Fig. 3

shows a schematic representation of a known Tellerauswerfers

Fig. 1 shows by way of example the stations of a folding box gluing machine. In the conveying direction (from left to right), this machine starts with an insert 1, which pulls off the blanks to be processed at high speed from one stack in succession and feeds them individually to the following processing stations. On the insert 1 follows a primary crusher 2, which is formed in two stages in the present embodiment. The pre-crusher 2 includes folding elements for folding and folding back folding flaps, so that the corresponding longitudinal scoring lines are made soft and supple.

On the primary crusher 2 follows as the next processing station a folding station 3, at the beginning of a commissioned work 4 for adhesive, usually glue, is arranged. The adhesive applicator 4 contains glue nozzles or glue discs, of which the adhesive is applied in strips on the blanks. Before the folding tabs provided with adhesive strips are folded by folding elements of the folding station 3, the applied adhesive tape is checked. For this purpose, the adhesive strip is scanned contactlessly with a so-called glue seam inspection device. If the tape does not have the required quality, the box is reported as faulty to the central control unit. At the end of the folding station 3, the folding boxes are checked for folding errors. For this purpose, photocells are arranged in this area, of which the length of the box is scanned. Does the length not conform to the given format, For example, because a flap was not folded properly, so this box is reported to the central control unit as faulty.

The folding station 3 is followed by an internal discharge device 7. By means of this defective carton blanks are discharged in a known manner via a controlled switch, for example, down into a container 8.

The internal discharge device 7 is followed by a transfer station 5. This has the primary task, the folded, provided with not yet set adhesive seams cartons aligned in all parts a subsequent collection and pressing device 6 supply. In the transition from the transfer station 5 to the collecting and pressing device 6, a scale flow is produced from the folded boxes. The collecting and pressing device 6 has press belts, by means of which the adhesive seams are held under pressure during conveying until the adhesive has set securely.

In the transfer station 5, a discharge device is additionally arranged, which has an outside next to the conveyor belt pair 9, 9 'or 10, 10' (FIG. Fig. 2a ) includes means for laterally withdrawing defective boxes 12 '. The device for extracting the boxes 12 'is preferably a turntable ejector or a linear ejector, as described in the introduction to the description and the references cited therein. The ejector grips the boxes 12 on an outside over the conveyor belt 9,9 'or 10, 10' projecting part 22 and pulls them out of the machine.

In FIGS. 2a and 2b a known linear ejector is shown by way of example. How out Fig. 2a it can be seen, clamp each two closely superimposed endless conveyor belts 9,9 'and 10, 10' (of which only the upper band is shown), the carton blanks 12 between them and thus form a conveyor line 11. The box blanks are at a speed V _1st moved in the direction of the arrow. Laterally at an angle α to the conveyor section 11, an ejector 13 is shown in the form of a linear ejector. How out Fig. 2b can be seen, the linear ejector consists of a conveyor belt 18 which is guided around two rollers 17 and 19 and a low-friction surface 15. The roller 17 is driven by a motor, not shown. Between conveyor belt 18 and surface 15, the defective carton blanks are pinched and discharged. As a gripper this can serve, for example, a pivotable portion 16 of the conveyor belt, by being guided around a hinged roller 19.

oder aber, dass die Rolle 17 über einen nicht dargestellten unabhängigen Motor mit höherer Geschwindigkeit angetrieben wird.The discharge rate V ₂ is higher than the conveying speed V ₁ . This is realized either by the angle of attack α being selected accordingly $\left(V_2=\frac{V_1}{\cos \alpha }\right)$

or that the roller 17 is driven by an independent motor, not shown, at a higher speed.

The Fig. 3 shows an example of a known Tellerauswerfer. The Tellerauswerfer 30 is also like in Fig. 2a shown linear ejector 13 is arranged side of the conveyor line 11 so that it can detect the protruding portions 22 of the boxes 12 so as to auszuschleusen faulty boxes 12 '.

The Tellerauswerfer 30 includes a permanently rotating at high speed, flat turntable 31 which is driven by an electric motor 32 and which is arranged immediately outside next to the conveyor belt pairs 9, 9 'and 10, 10'. The turntable 31 of the ejector 30 is made of metal or plastic. But it can also be made of metal and wear a plastic coating. It is also conceivable to apply a coating to a metal plate, such as a molybdenum-containing alloy.

Furthermore, the Tellerauswerfer 30 contains at least two pressure plates 33, 34, which are arranged in the direction of joining 11 behind the center and at the outer edge of the turntable 31 in a row. The angle between the pressure plates 33, 34 and the conveyor belt pairs 9,9 'and 10,10' is adjustable via a rotary joint 35 in the holding device of the pressure plates 33, 34. The first pressure plate 33 in the conveying direction is oriented at an acute angle inclined towards the conveying direction of the belt pairs 9,9 'and 10,10' to the outside. The second pressure plate 34 in the conveying direction is preferably at an angle of greater than 45 degrees to the conveying direction of the belt pairs 9,9 'or 10, 10' set. The pressure plates 33, 34 are freely rotatably and movably mounted. In this case, the distance between the turntable 31 and the pressure plates 33, 34 are adjusted by means of an angle-shaped lever 36 and an associated adjusting screw 37, wherein the pressure plates 33, 34 do not rest on the turntable 31. About a stop 38 of the two-sided lever 39 for receiving the freely rotatably mounted pressure plates 33, 34 held parallel to the turntable 31. The required back pressure to the stop 39 is generated by a spring element 40.

The control of the respective Ausschleuseeinrichtungen via a control device 41, not shown. <B> LIST OF REFERENCES </ b> 1 depositors 18 conveyor belt 2 primary crusher 19 role 3 folding station 4 Adhesive factory 22 protruding box section 5 transfer station 6 Collecting and presser 30 Telle ejector 7 internal discharge device 31 turntable 32 electric motor 8th container 33 puck 9.9 ' conveyor belts 34 puck 10, 10 ' conveyor belts 35 swivel 11 Conveying direction / distance 36 lever 12, 12 ' boxes 37 adjusting screw 13 Linear ejector 38 39 Stop lever 15 surface 40 spring element 16 swiveling section 41 control 17 role

Claims (4)

1. A folding box gluing machine for manufacturing folding boxes from blanks, comprising several stations (1, 2, 3, 4, 5, 6, 7), wherein one of the stations is a folding station (3) in which blanks provided with an adhesive strip are folded and a subsequent station is a transfer station (5), wherein the folding box gluing machine comprises at least two pairs of conveying means each consisting of an upper belt and a lower belt, and wherein at least one external discharge device is provided in the transfer station (5),
   characterized in that
   a further station which is designed as an internal discharge device for defective boxes is provided before the transfer station (5), and that a control unit (41) is provided which controls the respective discharge device (7) depending on the type of box and/or the operation speed as a discharge station.
2. A folding box gluing machine according to claim 1,
   characterized in that
   said at least one external discharge device is designed as a linear ejector (13).
3. A folding box gluing machine according to claim 1,
   characterized in that
   said at least one external discharge device is designed as a plate ejector (30).
4. A folding box gluing machine according to any one of the preceding claims,
   characterized in that
   the respective discharge device is driven by independent single drives which are controlled by said control unit (41).

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