ES2222532T3 - CUTTING AND TRANSFER STATION FOR A FLAT BAG TREATMENT MACHINE THAT WORKS BY CYCLES. - Google Patents

Abstract

THE INVENTION REFERS TO A CUTTING AND TRANSPORTATION STATION (10) TO FEED BAGS (16) MANUFACTURED THROUGH THE REGULAR CUTTING OF A DOUBLE-LAYERED BAND MATERIAL (32) TO A MACHINE OF FLAT BAGS (10). THE STATION OF THE INVENTION IS CHARACTERIZED BECAUSE BELOW THE CUTTING STATION (30) A TRANSPORTATION DEVICE (20) IS PLACED FOR THE BAGS (16) MANUFACTURED IN THE CUTTING STATION (30), BECAUSE THE BAGS (16) THE TRANSPORTATION DEVICE (20) MAY BE POSITIONED TO BE FACED WITH REGARD TO THE FLAT BAG MACHINE (10), AND BECAUSE THROUGH A HOLDING DEVICE (22) CAN BE COLLECTED FROM THE TRANSPORT DEVICE (20) THE BAGS (16) ORIENTED FOR AND SEND THEM TO THE FLAT BAG MACHINE (10).

Description

Cutting and transfer station for a flat bag treatment machine that works by cycles

Technical field

The invention relates to a cutting station and transfer according to the preamble of claim 1 of a flat bag handling machine that runs by cycles. After separating the welded parts into sections individual bags of a band of two packing material layers, the bags closed at the bottom and laterally by the corresponding sealing cords are transferred to a flat bag handling machine. The transfer of bags to the flat bag handling machine also has place by cycles corresponding to the operation by cycles of the flat bag handling machine. The machine of flat bag handling has several stations successive work in which the bags are opened, filled and to Then they close at the top. The products food introduced into the bags may have consistency of dust, lumpy or any other type of consistency.

Current state of the art

In a flat bag handling machine known as a rotary machine with cutting station and pre-connected transfer, the band of two packing material open top layers, formed by a single fold, conforms by sections in open bags at the top by means of laces vertical and also horizontal sealing or welding on the part lower. The bags that are still attached are separated in the Own cutting station. Then the station transfer collects individual bags from the station cut and leads them to the first of the workstations successive of the flat bag handling machine.

The separation process takes place through a scissor cutting by separation blades in the zone of the sealing cords. Before the separation process or during it, tweezers or vacuum cleaners grab the bags and they transfer them to other clamps that move together with the subsequent displacement of the bags by the stations of Individual work These tweezers grab the bags while they they open, they fill and then they close at the stations Individual work.

A device of this type is already known by the document CH-A-491001. Your station cutting and transfer has a transport device arranged behind the cutting station, in which each of the individual bags is seized by aspiration using tapes endless conveyors that increase the speed of carrying the bags to adapt it to the speed of flat bag handling machine circulation arranged below. Said transport device has several teeth that act as a stop for a bag in each case. The bag driven in each case to the transport device against these teeth, with what is placed correctly. TO then the teeth are removed and release the placed bag correctly. The endless circulation belts of the device transport then lead the bag to a pair of tapes endless conveyors, from which the bag is then driven to the bag handling machine flat with two tweezers. With this cutting station and transfer is conducted in each case a single bag to the machine of handling flat bags. This cutting station and previously known transfer is not suitable for machines manipulation of flat bags that can be manipulated, that is to say open, fill and close, more than one bag simultaneously.

Something similar happens in relation to the document DE-A-2226466 previously known. The procedure and device disclosed in said document  to produce full flat bag containers also allow only successively drive individual bags to a machine of handling flat bags.

It is known that to eliminate this disadvantage that limits the productivity of a bag handling machine two or more bags can be handled simultaneously in the individual cycle steps The transfer of the bags is very expensive, especially in case of bag handling machines flat that produce two or more bags per cycle. On transfer from the cutting station to the clamps present in the machine handling of flat bags, the bags have to be displaced laterally with each other. Normally, the distance between the bags in the flat bag handling machine it is larger than the separation cut between two bags. Therefore, after the division, that is the separation of the bags, the distance between them is smaller than due for a correct positioning in the bag handling machine flat.

The lateral displacement presents other additional difficulties because the handling machines Flat bags have to handle bags of different sizes. By consequently, the machines must also be of adjustable format. This imposes enormous construction requirements on the station cutting and transfer, which implies some expenses corresponding.

Description of the invention

Starting from this state of the art, the invention aims to indicate a cutting station and Enhanced transfer of the type mentioned in the introduction to a flat bag handling machine, which allows a technically simple way to drive any number of bags by groups, that is to say simultaneously, to a manipulation machine of flat bags

The objective of this invention is met. by means of the characteristics indicated in claim 1. The sub-claims indicate refinements of the cutting and transfer station according to the invention.

The cutting and transfer station according to the invention leads in each case at least two bags simultaneously to the flat bag handling machine. From according to the invention, behind the cutting station is arranged a transport device that collects the bags produced at the cutting station. The bags can be positioned on the transport device in a reciprocal placement correct with respect to the bag handling machine flat. The clamping device or the arrangement of tweezers usually existing can then pick up the bags placed reciprocally correctly in the transport device and drive them to the flat bag handling machine. By consequently, before the transfer in front of the machine handling of flat bags to, for example, tweezers Transportation of flat bag handling machine configured for example as a rotary machine, separate bags they are already positioned with the correct reciprocal placement such as have to be arranged in the bag handling machine flat.

Since the separate bags at the station cut can be deposited on the transport device in the correct placement in terms of reciprocal distance, adjustments Formatting can be carried out very easily. In consequently, adaptation work in relation to filling of bags of different sizes or widths or the work of readjustment can be carried out technically very easily and yet extremely accurate.

The correct positioning of the bags separated at the cutting station on the device transport can take place easily by operating the transport device with a corresponding speed different. A very simple configuration of a device transport of this type is achieved with a conveyor belt of discretionary drive If the conveyor belt is configured as suction tape, the bags deposited on the Conveyor belt can be held and fixed in position Correct corresponding without problems. Then on the tape conveyor, the bags can be put in the position of corresponding transfer with respect to the first station of Work of the flat bag handling machine set for example as a rotary machine.

According to an essential embodiment of the invention, the cutting station has only one device separation. This is also applicable if the handling machine of flat bags you have to cyclically manipulate several bags in each case. This single separation device can be configured as rotating blade or rotating die, or also as a cutting blade with reciprocating motion. During the process cutting or corresponding separation, the blade of the device of separation must be moved at a minimum speed approximately equal to the forward speed of the band of Packing material.

If the blade is arranged on a roller rotating, the peripheral speed of the blade must only be equal to the speed of the packing material band during its contact with the advancing packaging material band; during the rest of its rotating movement, the peripheral speed of the blade can be different. The latter will occur in most of the cases, since the time of a blade revolution It depends on the diameter of the rotating roller and generally not matches the distance between the sealing cords of the packing material band. The speed of rotation of the roller rotating, and consequently of the rotating blade or the die swivel, can be adjusted at discretion in a variable way by A servomotor

The configuration of a rotating die enables the production of fully shaped bags Novelties at the cutting station. Through the die not only they can produce straight separation lines between adjacent bags,  but also separation lines with any type of curvature.

It has been proven that for the separation step it is advantageous to assign a counter roller to the rotating blade or in particular to the rotating die. If this anti-roller is configured as roller vacuum cleaner, you can vacuum a piece of waste produced by punching, for example in the case of a wavy separation line corresponding, and prevent the scrap piece from remaining transported together with the separate bag. The drawings show a example of such a scrap piece.

It has been proven that for a breakthrough without Failure of the packing material band is convenient arrange a roller device in front of the cutting device feed for the band of packaging material not yet divided. Both this advance roller device and the Transport device may have motor drives. The motor drives are coordinated with the cyclic sequence and the reciprocal distance between the individual bags. If installed a counter roller, advantageously this one is also Motor driven.

The band of packing material is conducted advantageously cyclically to the cutting station. During a cycle step, in the cutting station one successively separates determined number of bags of the band of packaging material. This group of individual bags is collected successively by a transport device The reciprocal distance between the bags of this group in the transport device corresponds to the distance that the bags have to present each other in the machine Flat bag handling. Therefore it is not necessary modify the reciprocal distance between the bags using the holding device with which the bags are transported from the transport device to the handling machine of flat bags

Other advantageous configurations and perfections of the invention follow from the characteristics indicated in the claims and of the following realization examples.

Brief description of the drawings

The invention is described and clarified further. in detail based on the embodiments shown in the drawings The drawings show:

Figure 1: A schematic perspective view of a cutting and transfer station according to the invention arranged in front of flat bag handling machine.

Figure 2: A representation similar to Figure 1, in which in the flat bag handling machine simultaneously manipulate four bags per cycle instead of two bags (Figure 1).

Figure 3: A schematic overview of the different positions of the bags corresponding to device according to Figure 2.

Figure 4: A side view of a section of the band of packaging material in the area of the cutting device with bags with a central notch.

Figures 5, 6: A plan view and a view side of the rotating roller to produce the shaped bag according to Figure 4.

Methods of carrying out the invention

A flat bag handling machine 10 that works by cycles, configured as a rotary machine, presents several workstations arranged successively in which They can simultaneously handle two bags in each case.

In a first workstation 12 are collected simultaneously in each case two bags 16.1 and 16.2 by means of a arrangement of tweezers 22 for each bag 16.1, 16.2. Inside of Workstation 12, the two bags 16.1, 16.2 are held by means of two tweezers 24 for the bag 16.1 and two tweezers 26 for the bag 16.2. Bags 16.1 and 16.2 are already positioned in the conveyor belt 20 such that the distance between their centers corresponds to the distance between the centers of the two pairs of tweezers 24, 26. Therefore, it is only necessary that the two clamp arrangements 22 can effect a movement inside of a plane.

The conveyor belt 20 carries the bags individual 16.1, 16.2, etc. from a cutting station 30 in its position shown in Figure 1 adjacent to the station work 12.

Individual bags are produced from a band of packing material 32, in this case by the execution of a single fold and the realization of cords longitudinal sealing 34, as well as the realization of a cord of transverse sealing not shown in Figure 1 and that extends through the area of the fold 35 of the web of material packing 32.

The band of packing material 32 moves cyclically forward in the direction of transport 38 by means of feed rollers, of which a feed roller 36 It is represented in front of cutting station 30. In this case, in one cycle step two bags are taken to the cutting station 30, are passed through it and deposited on the tape conveyor 20.

The feed roller 36, which is driven correspondingly by means of an M1 servomotor, it has an assigned upper roller 40. The band of packing material 40 is moves between the feed roller 36 and the upper roller 40 which It acts as a counter roller.

The packing material band 32, provided with longitudinal sealing cords 34 and a sealing cord transverse, reaches the cutting station 30. The cutting station 30 has a rotating die 42 that acts from above on the band of packing material 32. Below the band of packing material 32 is positioned a lower counter roller 44 opposite the die rotating 42. The counter roller 44 rotates with a rotational speed adapted to rotary die 42.

Rotary die 42 is rotated by means of a drive motor not represented in such a way that its die blade 48 has a peripheral speed corresponding to the speed of the packing material band 32, at least during your contact with it.

The cutting station 30 separates the sections of the band of packing material 32 in the area between the cords of longitudinal sealing 34, thereby producing bags individual 16 which are then transferred to the tape conveyor 20.

Actuating the tape in different ways conveyor 20, for example by means of an M3 servo motor that acts on its rear reversing roller 52, the bags can be place with the default discretionary reciprocal distance represented in Figure 1, which is explained in more detail below in relation to Figure 2.

The 10.2 flat bag handling machine represented in Figure 2 differs from the machine manipulation of flat bags 10 represented in Figure 1 in which in the flat bag handling machine they are not handled jointly in each case two, but four bags 16 (16.1, 16.2, 16.3 and 16.4). The handling includes the collection, the opening, the filling and closing the bags. Since the positioning of bags 16.1, 16.2, 16.3 and 16.4 on conveyor belt 20 takes place with an exact orientation with respect to the tweezers 24, 26 of the flat bag handling machine, the transfer of the bags to the first workstation 12.2 se It can be carried out technically easily. Thanks to the possibility of operating the conveyor belt 20 so discretionary, the adaptation of the entire device to bags of Different width does not present any problem. Another great economic and technical simplification is that it is only necessary provide a single rotating die 42 regardless of the number of bags to be handled together in each case.

Figure 3 schematically shows the different position of individual bags with snapshots drawn one under the other.

In the representation of Figure 3, the balls Same have the same reference. At the top you can observe how a longitudinal section of a band of material 32 packing that includes four bags 16.1, 16.2, 16.3, 16.4 arrives to the area of the die knife 48. The bags 16.1, 16.2, 16.3, 16.4 have a reciprocal distance "a" that is defined by the reciprocal distance between the sealing cords longitudinal and corresponds to its distance "a" in front of the cutting station Band 32 travels with the same speed of advance through the rotary die 42 and if necessary through from counter roller 44 to the conveyor belt 20. The conveyor belt advances in such a way that the bag 16.1 moves from position A to position B on the conveyor belt 20, while at the same time a 16.2 bag reaches the tape conveyor 20 in position A. Then the belt Conveyor 20 is driven with a higher speed. In this way, the 16.1 bag reaches a C position. At the same time, the bag 16.2 reaches position D, given that both bags 16.1 and 16.2 They advance at the same speed. Therefore, the distance between the two bags 16.1 and 16.2 in positions A, B is the same as in positions C, D.

During this forward movement, on the belt Conveyor 20 has placed a third bag 16.3. Third bag 16.3 is now in the initial position A. By another drive of the conveyor belt 20, in this case of slower again, the first 16.1 bag reaches an E position and, correspondingly, the second bag 16.2 reaches a position F and the third bag 16.3 reaches a position G. In this process maintains the arrangement of bags 16.1, 16.2 and 16.3 with each other. Only its distance to the die blade 48 varies. time a fourth bag 16.4 has reached position A on the tape conveyor 20. By another displacement of the four bags  16.1, 16.2, 16.3, 16.4 from positions E, F, G and A until positions H, I, K, L represented at the bottom of the drawing, the four bags 16.1, 16.2, 16.3, 16.4 arrive at a position in which they can be transferred to the first station of Work 12.2 of the flat bag handling machine 10.2 through the arrangement of tweezers 22.2.

The arrangement of the bags with each other in their transfer position in front of the first workstation 12.2 can be adjusted quickly and easily by varying the feed speed of the conveyor belt. That is, the 22.2 clamp arrangement only needs to perform a movement in a flat.

Figures 4 to 6 show how they can be produce bags with a non-straight side edge.

On the band of packing material 32 is produce 34.4 longitudinal sealing cords separated between yes similar to the production of sealing cords Longitudinal 34 (Figure 1). Sealing cords Longitudinal 34.4 have a bulging shape and enclose as an island an area of the band of packaging material 32 as a residual piece 60. The sealing jaws have a shape corresponding to the longitudinal sealing bead 34.4.

In the area of the cutting station, the blade of die 48.4 has a cutting edge 50 corresponding to the dashed line of Figure 4. This die profile 48.4 protrudes from the rotating die roller body 42, such as illustrate the plant of said rotary die 42 shown in the Figure 5 and the side view thereof shown in Figure 6. By means of the die knife 48.4, in the cutting station produce 16.10 bags that have a narrowing 70 by way of notch During the transport of these bags 16.10 from the area of the cutting station 30 towards the conveyor belt 20, the counter roller 44 sucks the residual part 60. From in this way, the residual part 60 does not reach the conveyor belt twenty.

When counter roller 44, which rotates correspondingly to the speed of the rotating die 42, has been separated with the residual piece 60 far enough - by example down - from the band of packing material 32, it can interrupt the suction pressure so that the counter roller 44 unload residual part 60 down.

Instead of the notched shape represented in the Figure 4, the bags can also present any other desired lateral contour. For example, the bags can also have a bottle shape

In this case, to control the drives for the feed roller 36 (M1), the counter-roller 44 (M2) and the reversing roller (rear) 52 (M3), of the three servomotors the M1 motor is used as master and the M2 and M3 engines as slaves. The corrections necessary for the preparation for the next process of die cutting or cutting are carried out in M2 and the establishment of the  necessary distance from the bags is made in M3 at the time which does not require any synchronism. Instead of the M1 engine You can also use any other engine as a master or even any virtual axis. In the latter case, the M1, M2 and M3 motor drives become controlled slaves by said virtual axis.

Claims (12)

1. Cutting and transfer station for drive to a flat bag handling machine (10) bags (16) produced by separating sections of a two-layer packing material band (32)

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with a transport device (20) for the bags (16) produced in the  cutting station (30), which is arranged behind the cutting station (30) and on which the bags (16) in a correct reciprocal placement with respect to the flat bag handling machine (10),

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with a holding device (22) with which the bags can be collected  (16), which are reciprocally placed correctly in the transport device (20), to drive them to the machine for handling flat bags (10),

characterized because

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he transport device (20) can be operated such that at least two bags (16) can be positioned on it a predetermined reciprocal distance (28) corresponding to its reciprocal distance (28) in the bag handling machine flat (10),

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he clamping device (22) can simultaneously collect these at least two bags of the transport device (20) and drive them to the flat bag handling machine (10)

2. Station according to claim 1, characterized in that,

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he transport device (20) is arranged next to the machine manipulation of flat bags (10) so that each of the at least two bags (16) can be transported from the transport device (20) to the handling machine flat bags (10) by a movement on a plane.

3. Station according to claim 1 or 2, characterized in that

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he transport device (20) can operate with speeds of transport adjustable in a discretionary way.

4. Station according to one of the preceding claims, characterized in that

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he transport device is on a conveyor belt (twenty).

5. Station according to claim 4, characterized in that

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the Conveyor belt (20) is a suction belt.

6. Station according to one of the preceding claims, characterized in that

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the cutting station (30) only presents a single device separation,

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he separation device is configured as rotating blade or  rotary die (42), or also as a cutting blade with back and forth motion.

7. Station according to claim 6, characterized in that

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the rotating blade or rotating die has several "blades" distributed peripherally in the direction of rotation.

8. Station according to claim 6 or 7, characterized in that

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the rotating blade or rotating die (42) is associated with a counter roller (44).

9. Station according to claim 8, characterized in that

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he anti-roller is configured as a roller suction (44).

10. Station according to one of the preceding claims, characterized in that

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by in front of the cutting station (30) a device is arranged of feed roller (36) for the band of packaging material (32) not yet divided,

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is it so respective motor drives (M1, M3) provided for the feed roller device and for the device transport.

11. Station according to one of claims 8 to 10, characterized in that

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a drive is also provided to motor (M2) for the counter-roller or roller suction (44).

12. Station according to one of the preceding claims, characterized in that

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the packing material band (32) is cyclically driven to the cutting station (30) such that within the cycle the station cutting group (30) produces a group of bags (16) that includes a certain amount thereof,

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he bag group (16) is successively led to the device transport (20) so that the bags of a group meet on the transport device in reciprocal placement correct.