EP0872421B1 - Cutting and transferring station of a flat-bag handling machine operating stepwise - Google Patents

Description

TECHNICAL AREA

The invention relates to a cutting and transfer station according to the preamble of claim 1 a clocked working Sachet machine. After section by section of double-layered parts welded into individual bags existing packaging material web will be replaced by the corresponding one Sealing seams on the side and bottom of a sealed pouch Hand over the flat bag machine. The handover of the bags to Flat bag machine is carried out according to the clocked Operation of the flat bag machine also clocked. The Flat bag machine has several arranged one after the other Workstations where the bags are opened, filled and then be closed on the top. In the The bags filled with food can be packed in powdery, in pieces or other consistency.

STATE OF THE ART

In a known flat-bag machine designed as a rotary machine with upstream cutting and transfer station the one-time folding, Open, double-layer packaging material section by section vertically and also horizontally below by sealing or Welds formed into open-topped bags. In the cutting station the bags that are still connected are separated. Then the individual bags are replaced by the Transfer station removed from the cutting station and each first of the successively arranged work stations of the Flat bag machine fed.

The separation process takes place by a scissor-like Cut by a knife in the area of the sealed seams is made. Before or during the separation process the bags are gripped by grippers or suction cups and others Grippers that move with the bags in each Run and hand over workstations. In these grabs the pouches are held while in the individual Workstations opened, filled and then closed become.

Such a device is of the generic type CH-A-491 001 previously known. Your cutting and transfer station has a transport device downstream of the cutting station, in the individual bag by means of endless revolving conveyor belts gripped by suction and on brought a higher conveying speed to theirs Conveying speed of the circulation speed of the subordinate Adapt flat bag machine. On this transport device are each as a stop for a bag there are several teeth against which the teeth in each the transport device abuts bags that are transported into it and thereby being properly aligned. Then swivel teeth away and give the properly aligned pouch free. The bag is then removed from the endless belts the transport device on an endlessly rotating pair of conveyor belts transported from which the bag then then using two grippers of the flat bag machine is fed. At this cutting and transfer station individual bags fed to the flat bag machine. For flat bag machines that have more than one bag can handle simultaneously, d. H. open, fill and can seal, this is known cutting and transfer station not suitable.

The same applies to the previously known DE-A-22 26 466. The method known thereafter and the method according to it Known device for producing filled flat bag packs also only allow that one after the other Feeding individual bags to a flat bag machine.

To this the performance of a flat bag machine To fix the limiting disadvantage, it is known in the individual Beat two or more bags at a time handle. Especially with flat bag machines, the two or Making more bags per cycle, the bag handover is very consuming. The bags have to be transferred from the cutting station into the grippers on the flat bag machine namely laterally shifted from each other; the distance between bags on the flat bag machine is regular larger than the separating cut between two bags. Thereby is after cutting, that is, after separating the bag, the mutual distance of these bags smaller when he got the right positioning on the flat bag machine have to be.

Additional difficulties arise with a side Shift in that the flat bag machines differ need to handle large bags. This means that Machines can also be format adjustable. To the cutting and This makes the transfer station very high in terms of construction Claims are made, which leads to corresponding costs.

PRESENTATION OF THE INVENTION

The invention is based on this prior art based on the task of an improved cutting and transfer station of the type mentioned for a flat bag machine to specify with a technically simple way any number of bags in groups, d. H. simultaneously can be fed to a flat bag machine.

This invention is characterized by the features of claim 1 given. Developments of the cutting and Transfer station are the subject of subclaims.

From the cutting and transfer station according to the invention at least two bags each of the flat bag machine at the same time fed. According to the invention it is provided that the A transport device is arranged downstream of the cutting station, from which the bags produced in the cutting station are picked up become. The bags can be placed on the transport device regarding the flat bag machine in mutual correct Alignment. The one in the transport device then correctly aligned bags from the usually existing holding device or gripper arrangement recorded and fed to the flat bag machine become. The isolated bags are therefore before handover for example in the transport gripper trained as a rotary machine in front of the Flat bag machine already correctly aligned with each other positioned as they place in the flat bag machine should find.

Due to the possibility of being isolated in the cutting station Pouches in correct mutual spacing To be able to put on the transport device can Format adjustment can be made very easily. conversion work in connection with filling different large or wide bags or readjustments can therefore be technically very simple and still be made extremely accurately.

The correct positioning of the cells in the cutting station Bags on the transport device can be easily Way done in that the transport device accordingly is driven at different speeds. A very simple design of such a transport device is realized by an arbitrarily drivable conveyor belt. If the conveyor belt is designed as a suction belt the bags placed on the conveyor belt can be placed in their respective correct orientation easily maintained and be fixed in position. On the conveyor belt, the Bag then related to their respective transfer position the first workstation, for example as a rotary machine trained flat bag machine are brought.

After an essential embodiment of the invention Cutting station only a single cutting device. This can also apply if several bags are clocked in the Flat bag machine to be traded. This one Separating device can be used as a rotary knife or rotary punch or also as a reciprocating cutting knife be trained. The cutting edge of the cutting device must be used during the respective cutting or cutting process at least approximately the speed of those traveling Have packaging material web.

When arranging the cutting edge on a rotary roller needs the peripheral speed of the cutting edge only with their Contact with the packaging material web moving forward To have the speed of the packaging material web; during their remaining orbital motion can be the orbital velocity of the Cutting edge to be a different one. The latter is used in the in most cases, because the orbital period of the Cutting edge depends on the diameter of the rotating roller and generally not with the mutual spacing of the sealing seams matches in the packaging material web. By means of a Servomotors can change the rotational speed of the rotating roller and thus the cutting edge of the rotary knife respectively variably set by the rotary punch become.

The formation of a rotary punch enables completely new types Bag shapes in the cutting station. So through the punch not only straight dividing lines between neighboring ones Bags, but also arbitrarily curved dividing lines be generated.

It has proven advantageous for the separation process the rotary knife or in particular assign a counter roller to the rotary punch. If so Counter roll is formed as a suction roll, can be the same one with a corresponding corrugated, for example Separation line sucked-in waste piece generated by punching and the piece of waste from its further transport with the individual Bags are held. Such a piece of waste is shown as an example in the drawing.

It has for a trouble-free propulsion of the packaging material web turned out to be useful, the cutting device a Feed roller device for the still inseparable packaging material web vorzuordnen. Both this preferred roller device the transport device can also be motor drives have. The motor drives are on the clock sequence and the mutual spacing of the individual bags matched. If a counter roll is arranged, it is advantageous these are also driven by a motor drive.

The packaging material web is advantageously timed Cutting station fed. Be within one bar step a certain number in succession in the cutting station isolated from bags from the packaging material web. This group of individual bags is transported one after the other by a transport device added. The mutual distance between the bags this group in the transport device corresponds to that mutual distance the bags in the flat bag machine should have. A change in the mutual Distance of the bags by the holding device with which the Bags from the transport device to the flat bag machine are therefore not necessary.

Further advantageous refinements and developments of Invention are the features further specified in the claims as well as the following exemplary embodiments.

BRIEF DESCRIPTION OF THE DRAWING

Fig. 1

eine perspektivische, schematisierte Ansicht einer vor einer Flachbeutelmaschine angeordneten Schneid- und Übergabestation nach der Erfindung,

Fig. 2

eine Darstellung ähnlich Fig. 1, bei der nicht zwei (Fig. 1), sondern vier Beutel pro Takt in der Flachbeutelmaschine gleichzeitig gehändelt werden,

Fig. 3

eine schematisierte Übersicht der verschiedenen Positionen von Beuteln entsprechend der Vorrichtung gemäß Fig. 2,

Fig. 4

eine ausschnittsweise Seitenansicht der Packstoffbahn im Bereich der Schneidvorrichtung bei Beuteln mit einer mittigen Taille und

Fig. 5, 6

eine Draufsicht und eine Seitensicht der Rotationswalze zum Herstellen der Beutelform gemäß Fig. 4.

The invention is described and explained in more detail below with reference to the exemplary embodiments shown in the drawing. Show it:

Fig. 1

2 shows a perspective, schematic view of a cutting and transfer station according to the invention arranged in front of a flat bag machine,

Fig. 2

a representation similar to FIG. 1, in which not two (FIG. 1) but four bags per cycle are handled simultaneously in the flat bag machine,

Fig. 3

2 shows a schematic overview of the different positions of bags corresponding to the device according to FIG. 2,

Fig. 4

a fragmentary side view of the packaging material web in the area of the cutting device for bags with a central waist and

5, 6

4 shows a top view and a side view of the rotary roller for producing the bag shape according to FIG. 4.

WAYS OF CARRYING OUT THE INVENTION

A flat-bag machine designed as a rotary machine, working in a clocked manner 10 has several arranged one after the other Workstations in which two bags at a time can be handled.

In a first work station 12 there are two bags each 16.1 and 16.2 simultaneously by a gripper arrangement 22 for each bag 16.1, 16.2 taken over. Inside the work station 12, the two bags 16.1, 16.2 by two grippers 24 for the bag 16.1 and two grippers 26 for the Bag 16.2 held. Bags 16.1 and 16.2 are already positioned on the conveyor belt 20 so that you are centered Distance 28 the central distance between the two pairs of grippers 24, 26 corresponds. The two gripper assemblies 22 therefore need only perform one movement within a level at a time to be able to.

The individual bags 16.1, 16.2 etc. from a cutting station 30 in their the work station 12 adjacent position shown in Fig. 1 transported.

The individual bags are made from a packaging material web 32 in the present case, fold over once and section by section Attaching longitudinal seal seams 34 and attaching an in Fig. 1, not shown, in the fold area 35 of the packaging material web 32 running transverse sealing seam.

The packaging material web 32 is over preferred rollers, one of which Preferred roller 36 is shown in front of the cutting station 30 in Transport direction 38 moved in cycles. Within a In the present case, two steps are used for the clock step Cutting station 30 fed, passed through the same and placed on the conveyor belt 20.

The preferred roller 36, correspondingly by means of a servo motor M1 is driven, an upper roller 40 is assigned. Between the preferred roller 36 and the counter roller serving upper roller 40, the packaging material web 32 is moved through.

The with longitudinal seal seams 34 and a lower transverse seal seam provided packaging material web 32 reaches the cutting station 30. The cutting station 30 has a top view of the packaging material web 32 acting rotary punch 42. Below the Packaging material web 32, opposite the rotary punch 42, a lower counter roll 44 is positioned. The counter roller 44 has a rotational speed adapted to the rotary punch 42.

The rotary punch 42 is by a not shown Drive motor set in rotation so that its cutting edge 48 at least during their contact with the packaging material web 32 has an orbital speed that of the speed corresponds to the packaging material web 32.

The sections of the packaging material web are cut by the cutting station 30 32 in the area between the longitudinal seal seams 34 isolated and thereby individual bags 16 produced, the then be transferred individually to the conveyor belt 20.

By driving the conveyor belt 20 differently, for example by means of one on its rear deflecting roller 52 acting servo motor M3 can put the bags in their Fig. 1 shown mutually predetermined, arbitrary Distance, which is related below Fig. 2 will be explained in more detail.

The flat bag machine 10.2 shown in FIG. 2 differs differs from the flat bag machine shown in Fig. 1 10 in that not two but four bags 16 (16.1, 16.2, 16.3 and 16.4) together in the Flat bag machine can be handled. Managing includes grasping, opening, filling and closing the bags. Characterized in that the positioning of the on the conveyor belt 20 Bags 16.1, 16.2, 16.3 and 16.4 exactly aligned to the Grippers 24, 26 of the flat bag machine is the Transfer of the bags into the first work station 12.2 possible in a technically simple way. A change of the entire device on bags of different widths through the possibility of driving the conveyor belt 20 as desired, possible without any problems. It also proves to be an economically and technically great simplification that regardless of the number of those to be handled together Bags only ever provided a single rotary punch 42 needs to be.

3 shows snapshots drawn with one another the successively different positions of individual bags represented schematically.

3 the same bags have the same name. In the upper area you can see how a four bags 16.1, 16.2, 16.3, 16.4 containing length section a packaging material web 32 in the area of the cutting edge 48 arrives. The bags have 16.1, 16.2, 16.3, 16.4 one by the mutual distance between the longitudinal sealing seams defined mutual distance a, the their distance a before corresponds to the cutting station. At the same feed rate the web 32 through the rotary punch 42 and possibly through the counter roller 44 onto the conveyor belt 20 moves. The conveyor belt is moved so that the Bag 16.1 from its position A to a position B on the Conveyor belt 20 arrives while following simultaneously another bag 16.2 in position A on the conveyor belt 20 arrives. Then the conveyor belt 20 with driven at a higher speed. As a result, the bag 16.1 comes into a position C. At the same time the bag 16.2 reaches position D because both Bags 16.1 and 16.2 are moved at the same speed become. As a result, the distance between the two bags 16.1 and 16.2 in their positions A, B the same size as in their positions C, D.

During this movement, a third bag 16.3 is open the conveyor belt 20 has been positioned. The third bag 16.3 is again in the starting position A. By another, now slower drive of the conveyor belt 20, the first bag 16.1 comes into a position E, accordingly the second bag 16.2 in a position F and the third bag 16.3 in a position G. The mutual Alignment of bags 16.1, 16.2 and 16.3 remains received in the process. Only their distance from the cutting edge changes 48. At the same time is a fourth bag 16.4 have been placed in position A on the conveyor belt 20. By further transporting the four bags 16.1, 16.2, 16.3, 16.4 from their positions E, F, G and A into the in positions H, I, K, L shown at the bottom of the drawing these four bags 16.1, 16.2, 16.3, 16.4 get into one Position from which they are in the first workstation 12.2 Flat bag machine 10.2 by means of the gripper arrangement 22.2 can be handed over.

, The mutual alignment of the bags in their transfer position in front of the first work station 12.2 can by variation the conveyor speed of the conveyor belt quickly and easy to set. The gripper assembly 22.2 all you need to do is move in one plane.

In Figures 4 to 6 it is shown how bags with not straight side margin can be produced.

On the packaging material web 32 are spaced apart Longitudinal seal seams 34.4 in a manner comparable to the longitudinal seal seams 34 (Fig. 1). The longitudinal seal seams 34.4 have a bulbous shape and close an island-like Area of the packaging material web 32 as a residual piece 60. The sealing jaws have a longitudinal sealing seam 34.4 corresponding Shape.

In the area of the cutting station, the cutting edge 48.4 a cutting edge 50 that corresponds to the dashed line in FIG. 4 equivalent. This die 48.4 is on the roll body Rotary punch 42 is protruding, like the top view on this rotary punch 42 in Fig. 5 and the side view the same in Fig. 6 illustrate. Through the cutting edge 48.4 bags 16.10 are produced in the cutting station, which have a waist-like constriction 70. When transporting these bags 16.10 from the area of Cutting station 30 out and onto the conveyor belt 20 the remaining piece 60 is sucked in by the counter roller 44. The As a result, the remaining piece 60 does not reach the conveyor belt 20.

When the backing roller 44 moves according to the rotary punch speed 42 rotated with the Remnant piece 60 sufficiently far - for example downwards - has moved away from the packaging material web 32, the suction pressure interrupted and the remaining piece 60 - down - from the Counter roll 44 are dropped.

Instead of the waist shape shown in Fig. 4, the Bags also have any side contour. So can the bags also have a bottle shape, for example.

In the present case, is used to control the drives for the Feed roller 36 (M1), counter roller 44 (M2) and the (rear) Deflection roller 52 (M3) from the three servo motors the motor M1 used as the master and the motors M2 and M3 used as the slave. The necessary corrections to prepare for the next punching or cutting process for M2 and the production of the necessary spacing of the bags at M3 in the time when no synchronization is required is. Instead of the M1 motor, any other motor can or any virtual axis used as a master become. In the latter case, the motor Drives M1, M2 and M3 to those controlled by this virtual axis Slaves.

Claims (12)

1. Cutting and transfer station by means of which bags (16) which are produced by being severed in batches from a double-layered packaging-material web (32) are fed to a flat-bag machine (10),

   having a transporting apparatus (20) for the bags (16) produced in the cutting station (30), which is arranged downstream of the cutting station (30) and on which it is possible for the bags (16) to be oriented correctly in relation to one another in respect of the flat-bag machine (10),

   having a retaining arrangement (22), by means of which the bags (16) which are oriented correctly in relation to one another can be received from the transporting apparatus (20) and fed to the flat-bag machine (10),

   characterized in that

   the transporting apparatus (20) can be driven such that at least two bags (16) can be positioned on the transporting apparatus (20) at a predetermineable spacing (28) from one another which corresponds to their spacing (28) from one another on the flat-bag machine (10),

   these at least two bags can be simultaneously removed from the transporting apparatus (20), and fed to the flat-bag machine (10), by the retaining arrangement (22).
2. Station according to Claim 1, characterized in that

   the transporting apparatus (20) is provided alongside the flat-bag machine (10) such that each of the at least two bags (16) can be transported from the transporting apparatus (20) to the flat-bag machine (10) by a movement in one plane.
3. Station according to Claim 1 or 2, characterized in that

   the transporting apparatus (20) can be operated at transporting speeds which can be set as desired.
4. Station according to one of the preceding claims, characterized in that

   the transporting apparatus is a transporting belt (20).
5. Station according to Claim 4, characterized in that

   the transporting belt (20) is a suction belt.
6. Station according to one of the preceding claims, characterized in that

   a single severing apparatus is provided in the cutting station (30),

   the severing apparatus is designed as a rotary blade or rotary punch (42) or as a reciprocating cutting blade.
7. Station according to Claim 6, characterized in that

   the rotary blade or the rotary punch has a plurality of "blades" which are distributed circumferentially in the direction of rotation.
8. Station according to Claim 6 or 7, characterized in that

   the rotary blade or the rotary punch (42) is assigned a counter-roller (44).
9. Station according to Claim 8, characterized in that

   the counter-roller is designed as a suction roller (44).
10. Station according to one of the preceding claims, characterized in that

    an advancement-roller arrangement (36) for the not yet cut packaging-material web (32) is arranged upstream of the cutting station (30),

    motor drives (M1, M3) are provided for the advancement-roller arrangement and for the transporting apparatus.
11. Station according to one of Claims 8 to 10, characterized in that

    a motor drive (M2) is also provided for the counter-roller or suction roller (44).
12. Station according to one of the preceding claims, characterized in that

    the packaging-material web (32) is fed cyclically to the cutting station (30) such that, within the cycle, a group of bags (16), which contains a certain number of bags, is produced by the cutting station (30),

    the group of bags (16) is fed successively to the transporting apparatus (20) such that the bags of a group are oriented correctly in relation to one another on the transporting apparatus.

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