EP1925557B1 - Turning and sealing station for packaged goods of varying size and film packaging machine for packaged goods of varying size - Google Patents

Abstract

A first machine unit (FMU) (11) takes the form of a packing station with a vertical packer. A second machine unit (51) has a rotating station. On the FMU there is a machine frame (12) and a covering hood (13). On the front side there is a moving control desk (32). Two mounting devices (14,15) each carry foil reserve rolls (16,17), from each of which strips of flat foil material are unwound. Independent claims are also included for the following: (1) A device for cutting off projecting ends on foil bags by a torch with pieces of packaging of different sizes in respect of the direction of conveying a preset width; (2) A device for enveloping and welding in pieces of packaging of different sizes in foil material.

Description

The invention relates to a method and a device for welding off supernatants of film bags with respect to the transport direction predetermined width, the Packgutstücke changing size included.

The invention further relates to a method for wrapping and welding of in particular flexible Packgutstücken changing size or changing formats, such as textiles, and an apparatus for performing this method.

From the DE 196 21 205 C2 a device is known, are surrounded with the Packgutstücke tubular of a film web. In each case in front of and behind a packaged piece of goods, the film tube is cut off with a separating welding knife oriented transversely to the transport direction of the film web. With further arranged on both sides of the Packgutstückes side Trennschweißmessern then lateral Trennschweißnähte be generated, thereby closing the film tube as packaging bag on all sides around the Packgutstück. In this case, the length of the separated film tube sections can be adapted to the detected with sensor means length of Packgutstücke. However, since the width of the film bag is determined by the fixed distance of the lateral Trennschweißmesser, an adaptation to the width of the Packgutstücke is not possible, but lateral projections can arise. In order to remove these, the transport direction of an already welded Packgutstückes is changed by 90 ° and the already closed film packaging with another transverse to the new direction of transport Separating welding device separated immediately before or behind the Packgutstück in a final separation process. The dimensions of the device used for this purpose are extremely unfavorable with respect to the required footprint.

From the DE 10 2005 025706 B3 a return packaging machine for wrapping and welding of Packgutstücken of varying size in film material is known in which aligned on a stationary Ausrichtkante Packgutstücke are wrapped in a Halbfolienschlauch and transverse cross-welding between the individual Packgutstücken be placed transversely on a Verschließkante, whereupon longitudinal welding along the still open longitudinal edge of the half-film tube takes place. The transverse displacement of Packgutstücke not yet closed hose cover is technically complicated.

The invention has for its object to provide a method and an apparatus with which supernatants of plastic bags, which have based on the transport direction predetermined width, but contain packaged items of varying size, can be separated in a space-economical manner

Furthermore, a method and apparatus for wrapping and welding of Packgutstücken changing size in film material to be improved so that Packgutstücke with a large range of stack heights and formats in varying order in space-economical manner can be packed reliable, the application to Banderoliereranlagen as well as should be possible on Halbfolienschlauchanlagen.

• Drehen der einzelnen Packgutstücke um 90°, so daß der zuvor seitlich liegende Überstand in Transportrichtung nach vorne oder hinten weist,
• Weitertransport der einzelnen Packgutstücke in der vorherigen Transportrichtung, Abtrennen der Überstände durch Quertrennschweißen der Folienbeutel vor oder hinter den einzelnen Packgutstücken.

The solution consists in a method for welding off supernatants of foil bags with respect to the transport direction predetermined width, the Packgutstücke of varying size, the Packgutstücke relative to the transport direction in each case inside a longitudinal edge of the foil bag tightly abut and on the other longitudinal edge of the foil bag alternately wide one-sided protrusion over the individual packaged goods, with the following steps:

• Turning the individual items to be packaged by 90 °, so that the supernatant lying supernatant in the transport direction to the front or back,
• Further transport of the individual items to be packaged in the previous transport direction, separation of the supernatants by cross-section welding of the foil bags in front of or behind the individual packaged goods.

• Einschlagen der einzelnen Packgutstücke in Verpackungsfolie, wobei sich obere und untere Folienlagen auf die Ober- und Unterseiten der Packgutstücke legen,
• erstes Quertrennschweißen der oberen und unteren Folienlagen quer zur Transportrichtung der Packgutstücke jeweils unmittelbar hinter der hinteren Stirnseite und vor der vorderen Stirnseite der einzelnen Packgutstücke,
• Längstrennschweißen der oberen und unteren Folienlagen an zumindest einer Längsseite der einzelnen Packgutstücke in festem Abstand von der anderen Längsseite der einzelnen Packgutstücke, so daß sich allseitig geschlossene Folienbeutel vorgegebener Breite unabhängig von der Größe der einzelnen Packgutstücke bilden, wobei die Packgutstücke jeweils innen an einer Längskante der Folienbeutel dicht anliegen und an der anderen Längskante des Folienbeutels ein wechselnd breiter Überstand über die einzelnen Packgutstücke entsteht,
• Drehen der einzelnen Packgutstücke um 90°, so daß der zuvor seitlich liegend Überstand in Transportrichtung nach vorne oder hinten weist,
• Weitertransport der einzelnen Packgutstücke in der vorherigen Transportrichtung, Abtrennen der Überstände durch Quertrennschweißen der Folienbeutel dicht vor oder hinter den einzelnen Packgutstücken,

wobei die Packgutstücke einen insgesamt linearen Transportweg durchlaufen.The solution also consists in a method for wrapping and welding of packaged items of varying size in film material, with the following steps:

• Wrapping the individual packaged goods in packaging film, with top and bottom film layers laying on the top and bottom sides of the packaged goods,
• first cross-cutting welding of the upper and lower film layers transversely to the transport direction of the Packgutstücke each directly behind the rear end face and in front of the front end face of the individual Packgutstücke,
• Longitudinal separation welding of the upper and lower film layers on at least one longitudinal side of the individual Packgutstücke at a fixed distance from the other longitudinal side of the individual Packgutstücke so that all sides closed foil bag predetermined width regardless of the size of the individual Packgutstücke form, the Packgutstücke each inside a longitudinal edge of Tightly against the film bag and at the other longitudinal edge of the film bag, a varying overhang over the individual Packgutstücke arises,
• Turn the individual items to be packaged by 90 °, so that the previously laterally projecting projection in the transport direction to the front or back,
• Further transport of the individual items to be packaged in the previous transport direction, separation of the supernatants by cross-section welding of the foil bags close to or behind the individual packaged goods,

wherein the Packgutstücke go through an overall linear transport path.

The dimensions of the individual Packgutstücke can be detected with appropriate sensors. The acquired data is then converted into control signals for driving the longitudinal transport means and for actuating the first cross-cut welding and the final cross-cut welding.

In this case, it is provided in particular that the first cross-cutting welding as far as the separation process is concerned, only a central region detected and contiguous lateral edge strips exist. The welds can also cover the entire width of the film webs. The edge strips connect the individual wrapped Packgutstücke each other and can support the transport of Packgutstücke with appropriate drive and guide.

During the subsequent longitudinal separation welding, the lateral edge strips lying outside the longitudinal welding points are then separated from the foil bag and the waste portions are wound up. The longitudinal separation welding entlag the longitudinal side of the Packgutstücke can be carried out at the same time on the entire length of the film bag in standing film bags. Preferably, however, longitudinal welding takes place progressively along the longitudinal side of the items to be packaged in the case of moving foil bags, with stationary thermal separation welding knives being able to be used.

In this case, an adjustment of the transverse spacing of the means for longitudinal separation welding is dispensed with the variable width dimensions of the individual Packgutstücke to achieve optimum packaging performance. With the longitudinal split welding, the packaged goods are welded in on all sides by welding the upper and lower film layers over the entire length of the packaged goods.

The abutment of the supernatants initially located on one side takes place only after the inventive turning of the Packgutstücke by 90 °, with only the feed in the original direction of transport through the second Quertrennschweißvorrichtung must be controlled individually. In contrast, no adjustments to the adjustment of the longitudinal or transverse separation welding devices are required. The inventive turning the Packgutstücke a purely linear concatenation of all parts of the system is possible, so that can be realized space-economical installation plans even when using multiple devices in a factory building. A transverse displacement of the film bag in the transport path, in which it could easily come to a slipping and deformation of the Packgutstücke within the foil bag, is completely avoided.

An insertion of the packaged goods on a lateral contact edge is to be assumed for the further sequence of the process. Automation of side-by-side insertion or transfer is possible with simple suitable means of delivery. The detection of the length and the height of the individual Packgutstücke can be done by means of suitable sensors, in particular contactless.

After a first process management (four-side welding machine), it is provided that a joining of two film webs to a film curtain in front of the front end faces of the Packgutstücke in a first transport position and the transverse cutting welding behind the rear end faces of Packgutstücke takes place in the same position in a second transport position, in particular for Two consecutive packaged goods in one operation.

After a second process management (forming shoulder machine), it is proposed that a half-film tube is made by rolling double-lying material from a roll of material, spreading the two layers and deflecting by 90 °, or that rolled flat film material from a roll of material and placed twice in a longitudinal folding station to a half-film tube is, with the individual Packgutstücke are then inserted longitudinally in the half-film tube, wherein they are largely in contact with the connecting edge of the upper and lower film layer. This is followed by transverse cutting welding in front of the front end faces of the packaged goods in a first transport position or transverse cutting welding behind the rear end faces of the packaged goods at the same location in a second transport position, in particular for two successive packaged goods in a single operation.

While in the former Bandander the longitudinal separation welding must be at a fixed distance from each other at two longitudinal edges, in the Halbfolienschlauchtechnik a longitudinal welding process only on one longitudinal side is required, the weld has a fixed transverse distance from the opposite longitudinal edge of Packgutstücke, which is predetermined by the Anlagefluchtlinie.

The laterally separated projections, ie the waste portions are removed in the transport direction. In this case, it is particularly favorable, time or speed decoupling the further transport of the separated supernatant from the further transport of the wrapped Packgutstückes to prevent re-sticking of the film material at the separation point. The individual laterally separated supernatants should be removed as exactly as possible in the longitudinal direction.

The inventive turning of the individual Packgutstücke takes place after a lifting of the longitudinal transport means, wherein after turning takes place a Wiederabsenken on the longitudinal transport means. The previously supernatant supernatant is preferably turned backwards. Subsequently, the items to be packaged are individually transferred to a further transport position, in which they have passed through a second cross-cutting device exactly, wherein the supernatant is separated in a subsequent cross-cutting welding process over the entire width of the film bag. The separated supernatants are discharged horizontally or downwards transversely to the transport direction.

In a particularly favorable procedure, it is proposed that at least the upper film layer be perforated before the all-round welding of the film bag for pressure equalization in the region of the initially lateral supernatant and the perforation are separated during final cross-cutting welding to separate the supernatant from the film bag. Hereby, excessive air pockets in the foil bag can be avoided during the first-time all-round welding, or the times can be reduced until the first-time all-round welding. Since the perforations are provided in the final supernatant to be welded off, the total packaging remaining after the final cross-cut welding is finally hermetically sealed.

Packaged goods of maximum width are also rotated in the turning station by 90 °, although in this case no first side or after turning backward supernatant is present, which would have to be separated. In that regard, the perforation is retained in the foil bag in these Packgutstücken.

• eine Drehstation zum Drehen der einzelnen Packgutstücke um 90°,
• eine Quertrennschweißvorrichtung zum Verschweißen und Abtrennen eines Überstandes an einer vorderen oder hinteren Stirnseite der Packgutstücke, die ursprünglich eine Längsseite der Packgutstücke bildete,
• sowie Längstransportmittel in linearer Anordnung und Verkettung.

The solution consists in addition in a device for welding off supernatants of foil bags with respect to the transport direction predetermined width, the Package goods of varying size included,
characterized by the features:

• a turning station for turning the individual packaged goods by 90 °,
• a cross-cutting device for welding and separating a supernatant at a front or rear end side of the packaged goods, which originally formed a longitudinal side of the packaged goods,
• as well as longitudinal transport means in a linear arrangement and concatenation.

• Mittel zum Einschlagen der einzelnen Packgutstücke in Verpackungsfolie, so daß sich obere und untere Folienlagen auf die Ober- und Unterseiten der Packgutstücke legen,
• eine erste Quertrennschweißvorrichtung zum Verschweißen und Abtrennen von Folienhüllen jeweils an der hinteren Stirnseite und an der vorderen Stirnseite der Packgutstücke,
• Längstrennschweißvorrichtungen zum Verschließen von Folienbeuteln auf zumindest einer Längsseite der einzelnen Packgutstücke, die in festem Querabstand zur gegenüberliegenden Langseite der jeweiligen Packgutstücke angeordnet sind,
• eine Drehstation zum Drehen der einzelnen Packgutstücke um 90°,
• eine zweite Quertrennschweißvorrichtung zum Verschweißen und Abtrennen eines Überstandes an einer vorderen oder hinteren Stirnseite der Packgutstücke, die ursprünglich eine Längsseite der Packgutstücke bildete,
• sowie Längstransportmittel in linearer Anordnung und Verkettung mit den einzelnen Vorrichtungen und der Drehstation.

The solution also consists in a device for wrapping and welding of Packgutstücken of varying size in film material comprising:

• Means for wrapping the individual items to be packaged in packaging film, so that upper and lower layers of film are placed on the upper and lower sides of the packaged goods,
• a first cross-cutting welding device for welding and separating foil sheaths respectively at the rear end side and at the front end side of the packaged goods,
• Longitudinal separation welding devices for closing foil bags on at least one longitudinal side of the individual packaged goods, which are arranged at a fixed transverse distance to the opposite long side of the respective Packgutstücke,
• a turning station for turning the individual packaged goods by 90 °,
• a second cross-cutting device for welding and separating a supernatant at a front or rear end side of the Packgutstücke, which originally formed a longitudinal side of the Packgutstücke,
• as well as longitudinal transport means in a linear arrangement and concatenation with the individual devices and the turning station.

The essential features here are longitudinal separation welding devices in fixed positions, in particular in pairs at a fixed transverse distance from each other, if the Packgutstücke retract in a four-side welding machine in a film curtain formed from two flat films, or a single longitudinal separation welding device at a fixed transverse distance to the contact edge, if the Packgutstükke at a form shoulder machine wrapped in a half-film tube. In both cases, after the longitudinal separation welding an off-center offset laterally internal system of Packgutstücke given at a longitudinal edge in the film bag, since the Packgutstücke be used adjacent to a contact edge in the device.

Dispensing with adjusting means for constantly changing setting for the longitudinal separating devices on an alternating width of the individual Packgutstücke simplifies the device significantly.

The lateral distance of the two-sided longitudinal separation welding devices from each other or the side distance of the individual longitudinal separation welding device from the opposite bearing rail for the Packgutstücke is fixed in this case, so that the longitudinal separation welding can be done with simplified means and accelerated.

An outstanding feature of the device according to the invention lies in a turning station, in which the Packgutstücke be moved from its unbalanced lateral position with respect to the foil bag in a rotated position by 90 °, in the previously lying supernatant now forward or preferably backward relative to the Packaged goods points.

Finally, a second Quertrennschweißvorrichtung of importance, which can now weld in the transport direction forward or preferably rearwardly projecting supernatant, so that the Packgutstücke changing size or changing formats are welded on all four sides fitting and without major residual spaces. The passage of the individual packages through the second cross-cutting device is easily scanned by suitable means to control the cross-cutting device thereafter.

The turning station preferably has a plurality of arranged in a grid in a plane transport rollers, which are in particular driven, wherein the rotating station has a liftable and gradually to each 90 ° rotatable lifting and rotating table, which comprises a plurality of arranged in a grid breakthroughs , which in two 90 ° from each other different rotational positions so on the Transport rollers are lowered, that they penetrate the openings with upper roller segments. In this case, it is provided in particular that the transport rollers and the apertures are arranged in a square grid. Furthermore, it is proposed that the lifting and rotary table is connected via a lifting and turning gear with cams with a single stepper motor.

The roles of the rotating station are divided into four jointly driven blocks, between which may lie a cross-shaped arrangement of suction in the lifting and rotating table, which are applied during lifting and turning with negative pressure to prevent slippage of the film bag due to inertial forces.

Immediately behind or preferably immediately before the second cross-cutting device in the transport direction means for lateral lateral removal of the separated supernatants are provided, as for example in the DE 196 21 205 C2 are described, which is incorporated herein by reference. Alternatively, instead, novel means may be provided for transversely discharging the separated supernatants, as described in greater detail below.

The rollers of an exit roller conveyor can be gummed beginning with the second cross-cutting device to effectively stop a resting film bag when stopping so that the incoming Packgutstück slips forward due to inertial forces in the film bag, so that the determined by the final cross-cut welding bag length can be minimized.

A preferred embodiment of a device according to the invention is shown in the drawings and will be described below.

1. a) in Seitenansicht
2. b) in Draufsicht;

FIG. 1 shows an overall device

1. a) in side view
2. b) in plan view;

1. a) in Seitenansicht
2. b) in Draufsicht;

FIG. 2 shows the turning station of a device according to the invention

1. a) in side view
2. b) in plan view;

FIG. 3 shows a separated supernatant discharge device in a first embodiment;

FIG. 4 shows a separation device for separated supernatants in a second embodiment.

The two representations of FIG. 1 will be described together below.

The apparatus clearly comprises a first machine unit 11, in the form of a packing station, which constitutes a so-called high packer, and a second machine unit 51, which comprises a turning station 55.

On the machine unit 11, a machine frame 12 and a cover 13 are to be distinguished. On the front of a sliding control panel 32 is shown. There are two holders 14, 15 can be seen, each carrying a film supply roll 16, 17, from which each uncoiled flat sheet material is unwound via upper drive and guide means 26 and lower drive and guide means 27 and welded together wrapped in the device Packgutstücke on all sides with film material to wrap.

The packaged goods are introduced into an insertion device 19 from the left and run through the entire device from left to right. The insertion device 19 essentially comprises an inlet conveyor belt 18 and right and left guide rails 20, 21, wherein the right guide rail 20 serves as a support rail for all Packgutstücke. Here, the Packgutstücke can be brought into contact with the right guide rail 20 manually or with mechanical guiding means. An investment line is designated A. On the intake conveyor belt 18 follows an outlet conveyor belt 22, wherein the conveyor belts 18, 22 in successive Arrangement form a horizontal transport plane T. The drive and guide means 26,27 for the lower film web and the upper film web cause the film webs are brought together in front of a first Quertrennschweißvorrichtung 28 in the transport plane T and are connected to each other in the first Quertrennschweißvorrichtung 28 before and behind each Packgutstück by cross-cutting. Here, the lower film web is guided between the inlet conveyor belt 18 and the outlet conveyor belt 22 up to the transport plane T, so that the lower film web comes to lie on the underside of the Packgutstücke, while the upper film web over the front end, the top and the rear Face of the packaged goods lays. Via a non-contact detection of the height and the length of the individual Packgutstücke in the region of the inlet into the device ensures that each Packgutstück is stopped immediately after passing through the first Quertrennschweißvorrichtung 28 and then pressing a downwardly lowerable crossbar of the first Quertrennschweißvorrichtung 28 the two Film webs are connected directly behind a Packgutstück to loop-shaped wrapping of Packgutstückes, wherein the two film webs are simultaneously connected to each other immediately before the next Packgutstück and the film webs between the two emerging welds are separated by means of a cutting edge.

The two weld seams are produced by sealing strips or upper punches arranged parallel to the cutting edge on the crosspiece, which can be lowered to a lower punch located slightly below the transport plane T, which is raised simultaneously over the transport plane T for welding and cutting.

In this way, around the Packgutstücke around foil covers that rest on the top and bottom and the front and rear end, while the two sides of the Packgutstücke are still open. The wrappings are in the form of belt loops, with lateral overhangs being provided in each case.

From the separation process, two lateral edge strips are excluded, where the Packaged goods still stuck together and taken for further transport of Packgutstücke taken.

On the cross-beam of the first cross-cutting device 28, a cutting tool 23 is laterally mounted on the inlet side, with which at each separation and welding operation, i. Each time the upper and lower film webs are welded together, an approximately 5 mm wide slot is created which penetrates the film webs. This slot later serves to vent the closed foil bag.

Immediately at the outlet side of the cross-cutting device 28, but independently controlled by this, a horizontal with a vertical actuating cylinder adjustable ventilation plate 29 is arranged, which is covered on the bottom with foam and hangs before each cross-cutting on the respective Packgutstück to the upper film web to press this. In this case, the displaced air can escape at the rear edge of the aforementioned belt loop, the lateral projections of which are already compressed in the region of the edge strips of closing and drive means.

In the further transport of the packaged in the aforementioned belt loops packed Packgutstücke by the outlet conveyor belt 22 regardless of the specific width of the individual Packgutstückes longitudinal welding takes place on both sides of Packgutstückes at a fixed distance from each other, the transverse distance of two longitudinal separation devices 24, 25 is predetermined and about the transverse distance the guide rails 20, 21 corresponds to each other. The longitudinal separating welders 24, 25 preferably have fixed thermal cutting welding blades. The upper film web and the lower film web are first combined for longitudinal split welding on both sides of the Packgutstücke by the closing and drive means in a plane. This plane may be above the transport plane T, so that both parts of the lower film web and parts of the upper film web are used to form the lateral parts of a closed film bag. In the longitudinal separation welding devices 24, 25 are simultaneously with the longitudinal welding the separated side projections on both sides of the Packgutstücke, wherein the individual orientation of the Packgutstücke, on the Anlagefluchtlinie A the individual Packgutstück each rests on the right in the transport direction in an oversized foil bag inside. The separated on both sides supernatants, which are continuously interconnected, are driven and wound on spools 30, 31, which are arranged on the front side of the machine frame 12. The packaged items which are welded on all sides are then discharged from the machine unit 11 via the discharge conveyor belt 22 and transferred to the machine unit 51.

Also on the machine unit 51, a machine frame 52 and a cover 53 can be seen. The machine unit 51 comprises an inlet roller conveyor 54, which adjoins the outlet conveyor belt 22 at a small distance in the same transport direction, a rotating station 55 and an outlet roller conveyor 56. The rotary station 55 comprises a lifting and rotating table 57 with a lifting and turning gear 58 and drivable rollers 59, which are arranged in a square grid and each penetrate with an upper segment provided with punched-Hub- and turntable 57 in its rest position. At least the length of the individual Packgutstücke is detected when entering the turning station 55 with non-contact sensor means. Once a Packgutstück in the transport direction centrally rests on the lifting and turntable 57, the rollers 59 are stopped in the field of turning station 55 and raised the lifting and rotating table 57, so that the Packgutstück rests on the openwork surface of the lifting and rotating table and lifted off the rollers. Thereafter, the lifting and rotating table is rotated by 90 °. The supernatant of the film bag, which previously lies on the left in the transport direction, is hereby rotated in the transport direction towards the rear relative to the packaged item. Subsequently, the lifting and rotating table 57 is lowered again and the rollers 59 in the area of the rotating station 55 are driven again so that the packaged product piece reaches the separately drivable outfeed roller track 56. After complete passage of a Packgutstückes by a second Quertrennschweißvorrichtung 60, the outlet roller conveyor 56 is stopped and now separated in the transport direction supernatant in the cross-cutting device 60 from the film bag. The cross-cutting device 60 also has a height-adjustable crosspiece on which a separating welding knife or a heatable upper punch is arranged. which can be lowered by means of the cross-beam to a slightly below the transport plane T lower punch. Immediately before the cross-cutting device 60 is a device for discharging the now completely separated from the tubular bag waste portion. The discharge device fits within the roller conveyor 56 in a narrow area on the inlet side of the cross-cutting device 60.
Instead of the inlet roller conveyor 54 may also be used consisting of a plurality of parallel endless belts infeed conveyor belt.

After the waste component has been removed, the package item which is tightly welded on all sides is discharged from the machine unit 51 by means of the outlet roller conveyor 26.

With regard to the sensors and the controller, the following details are to be addressed.

On the machine unit 11, an arrangement 71 of several superimposed horizontally arranged light barriers is set up in the inlet area, with which the height of the incoming Packgutstücke can be detected. Due to the height determined, the height of the cross-beam of the cross-cutting device 28 is controlled so that the Packgutstücke the cross-cutting device 28 can pass through trouble-free.

Also in front of the cross-cutting device 28, a vertically arranged light barrier 72 is provided, which controls after determining the passage of a Packgutstückes the outlet conveyor belt 26 with a certain amount of wake, that this is stopped by the Packgutstück immediately after passing the Quertrennschweißvorrichtung 28. In this case, the required trailing of the upper film web is controlled by the above-mentioned detected height.

At the inlet to the machine unit 51 is a vertically oriented light barrier 73, which immediately stops the inlet conveyor belt 18 upon detection of an incoming Packgutstückes and thus the Nachschieben more Packgutstücke prevents, provided that it must be noted that the inlet roller conveyor 54 of the machine unit 51 is stationary. The latter may be the case when the turning station 55 is occupied by a Packgutstück.

On the machine unit 51, a further vertically oriented light barrier 74 is arranged, which stops the inlet roller conveyor 54 after the entry of a Packgutstückes, if it is certain that there is still a Packgutstück on the rotating station 55. Only when such Packgutstück has left the turning station 55, the inlet roller conveyor 54 is driven again.

With a further vertically aligned light barrier 75, the length of the incoming to the rotating station 55 Packgutstückes is detected, taking into account a reasonable follower in the transport direction central position of Packgutstückes with the lifting and turntable 57 is sought before the rollers 59 of the rotating station 55 stopped become.

Immediately behind the light barrier 75 is a horizontally oriented transversely to the direction of transport light barrier 76, with a complete separation of two successive Packgutstücke is checked. If it comes to the interruption of this light barrier 76 after passing a leading Packgutstückes, it is prevented that the leading Packgutstück is stopped in the rotating station; Rather, the corresponding successive, still connected by film parts Packgutstücke be passed through the machine unit 51 without turning in the rotating station 55 and without Querabschweißen in the cross-cutting station 60 and then ggfls if necessary. manually discharged.

Before the cross-cutting device 60 is another vertically arranged light barrier 77, the output roller conveyor 56 with a certain caster controls after determining the passage of a Packgutstückes that this is stopped immediately after passing the Quertrennschweißvorrichtung 60 through the Packgutstück so that the Querabschweißen of rear-facing supernatant can be done very close to Packgutstück. This air can escape through the previously mentioned slot, which ultimately in the separated supernatant remains.

The two representations of FIG. 2 will be described together below.

It is a lifting and rotating table 57 shown of approximately square shape, which has a plurality of arranged in a square grid openings 61 and lifted by a lifting and rotating device 58 from the position shown and can be rotated stepwise by 90 °. The lifting and rotating table 57 has rounded corners 62 to keep the indicated by a circle pivot range K low. The lifting function as well as the twisting is performed by a single stepping motor 63 with a cam-controlled lifting and turning gear 64. Below the lifting and rotating table 57 is an arrangement of rollers 59, which consist of four square blocks, each block having a plurality of rollers on a common shaft, wherein an equally large plurality of waves in each block is parallel to each other. In the lowest position of the lifting and rotating table 57, the rollers 59 penetrate with their upper segments, the apertures 61, while the openwork surface 65 of the lifting and rotating table thereof in a raised position above the upper periphery of the rollers 59. By lifting the lifting and rotating table 57, an overlying Packgutstück be lifted from the rollers 59, so that it can be rotated freely with the lifting and rotating table. After turning by 90 °, the lifting and turntable 57 can be lowered again, the rollers 59 again engage in the square grid of the openings 61 in the lifting and turntable, so that an overlying Packgutstück after turning by 90 ° again by means of the drivable Rolls 59 can be moved in the unmodified transport direction. Between said blocks of rollers 59 are in a cross-shaped arrangement, a plurality of suction openings 65 which are acted upon by vacuum channels 66 exclusively when driving and rotating the lifting and rotating table 57 to prevent slipping of the film bag.

In FIG. 3 a discharge device for separated overhangs in a known per se embodiment is shown, which is arranged in front of the second cross-cutting device within the outlet roller conveyor. The discharge device 81 is in Viewed transport direction considered and includes a support assembly 82 to which a parallelogram 83 with actuating cylinder 84, a set of rollers 85 is arranged liftably. This is shown in the figure in the lowest position in which the rollers rest on the upper run 87 of an endless belt arrangement 86. The endless belt 88 is in this case driven by a drive motor 89, while the rollers of the roller set 85 run free and are taken along by the endless belt.

A cutting edge of a separated overhang is clamped when lowering the parallelogram 83 between roller assembly 85 and endless belt 88 and discharged horizontally and transversely to the transport direction from the general transport path upon actuation of the drive motor 89. A deflecting arrangement designated generally by 90 deflects the separated projection laterally from the transport path downwards.

In FIG. 4 a discharge device 91 is shown in a novel second embodiment, wherein the representation represents a vertical longitudinal section in the transport direction in the region of the second cross-cutting device. The transport plane T and rollers 92 of the outfeed roller conveyor 56 are also recognizable, as are parts of the second transverse cutting device, namely a welding punch 93 and a lower punch 94.

Immediately in front of the cross-cut welding device on the inlet side, a depressing strip 95 which can be actuated independently of the welding punch 93 is deflected downwards during the separating welding or immediately after the separating welding, where it can be clamped between a fixed drive roller 96 and a pivotable roller 97 , After retraction of the strip 95 and when driving the drive roller 96, the supernatant can be discharged perpendicular to the transport direction down from the transport path. On the outlet side of the cross-cut welding device, a further roller 98 of the outlet roller conveyor 56 can be seen, which in particular, as mentioned earlier, can have a rubberized surface, as well as the further rollers adjoining to the right.

Arrows reflect the direction of transport in all figures.

LIST OF REFERENCE NUMBERS

11

packing station

12

machine frame

13

cover

14

upper bracket

15

lower bracket

16

upper film roll

17

lower film roll

18

Einlaufförderbad

19

infeed

20

right guide rail

21

left guide rail

22

Exit conveyor belt

23

cutting tool

24

Longitudinal separation welder

25

Longitudinal separation welder

26

upper management and tightening agents

27

lower management and tightening agents

28

Cross cutting welder

29

vent plate

30

Kitchen sink

31

Kitchen sink

32

control panel

51

Turning and welding station

52

machine frame

53

cover

54

Feed roller conveyor

55

turning station

56

Outfeed roller conveyor

57

Lift and turntable

58

Lifting and turning device

59

roll

60

Cross cutting welder

61

breakthrough

62

corner

63

stepper motor

64

Lifting and turning gear

65

suction

66

Vacuum channel

81

reject device

82

carrier

83

parallelogram

84

actuating cylinder

85

roller set

86

belt arrangement

87

upper strand

88

endless belts

89

drive motor

90

redirecting

91

reject device

92

transport roller

93

upper punch

94

lower punch

95

Depressing bar

96

capstan

97

movable role

98

transport roller

A

System alignment

T

transport plane

K

swivel range

Claims (44)

1. A process of removing, by welding, protrusions on film bags whose width is predetermined with reference to the direction of transport and which contain pieces of packaged goods of varying size, wherein the packaged goods, with reference to the direction of transport, on the bag inside, closely rest against one longitudinal edge of the film bags and wherein, on the other longitudinal edge of the film bags, there exists a unilateral protrusion of variable width which projects from the individual pieces of packaged goods,
   characterised by the following process stages;
   turning the individual pieces of packaged goods by 90°, so that the previously laterally positioned protrusion, in the direction of transport, points to the front or to the rear;
   continuation of transport of the individual pieces of packaged goods in the previous direction of transport;
   severing the protrusions by transverse severance welding of the film bags in front of or behind the individual pieces of packaged goods.
2. A process according to claim 1,
   characterised in
   that the operation of turning the individual pieces of packaged goods is effected by lifting and lowering said pieces from and on longitudinal transport means.
3. A process according to any one of claims 1 or 2,
   characterised in
   that, while turning the individual pieces of packaged goods, the previously laterally positioned protrusion is turned backwards in the direction of transport.
4. A process according to any one of claims 1 to 3,
   characterised in
   that the protrusions severed in front of or behind the pieces of packaged goods are laterally removed transversely to the direction of transport.
5. A process according to any one of claims 1 to 3,
   characterised in
   that the protrusions severed in front of or behind the pieces of packaged goods are removed downwardly perpendicularly relative to the direction of transport.
6. A process according to any one of claims 1 to 5,
   characterised in
   that, prior to the transverse severance welding operation, the longitudinal dimensions and the height of the individual pieces of packaged goods are recorded by contact-free sensor means.
7. A process according to any one of claims 1 to 6,
   characterised in
   that, prior to the turning operation, the length of the individual pieces of packaged goods is recorded by contact-free sensor means.
8. A process according to any one of claims 1 to 7,
   characterised in
   that, prior to the second transverse severance welding operation, the length of the individual pieces of packaged goods, excluding the front and rear protrusions, is recorded by contact-free sensor means.
9. A process of enveloping and welding-in pieces of packageable goods of varying size into film material, including the following process stages;
   wrapping the individual pieces of packageable goods in packaging film, wherein upper and lower film layers rest on the upper side and lower side of the pieces of packageable goods;
   first transverse severance welding of the upper and lower film layers transversely to the direction of transport of said pieces, directly behind the rear end face and in front of the front end face of the individual pieces,
   longitudinal severance welding of the upper and lower film layers on at least one longitudinal side of the individual pieces of packaged goods at a fixed distance from the other longitudinal side of the individual pieces, so that, independently of the size of the individual pieces of packaged goods, there are formed film bags of a predetermined width which are closed on all sides, wherein said pieces, on the inside, closely rest against one longitudinal edge of the film bag and wherein, at the other longitudinal edge of the film bags, there occurs a variably wide unilateral protrusion projecting from the individual pieces;
   turning the individual pieces of packaged goods by 90°, so that the previously laterally positioned protrusion points to the front or rear in the direction of transport;
   continuation of the transport of the individual pieces of packaged goods in the previous direction of transport;
   severing the protrusions by a second transverse severance welding operation carried out on the film bag in front of or behind the individual pieces.
10. A process according to claim 9,
    characterised in
    that the operation of wrapping the individual pieces of packageable goods is effected by moving same into a film curtain which consists of an upper length of film and a lower length of film which can be pulled off perpendicularly and which opens up transversely to the direction of transport. (Machine welding on four sides).
11. A process according to claim 9,
    characterised in
    that the operation of wrapping the individual pieces of packageable goods is effected by moving same into an infinite film semi-hose which consists of an upper length of film and a lower length of film, which lengths of film are connected to one another at a longitudinal edge and which extend in the direction of transport. (Forming shoulder machine).
12. A process according to any one of claims 9 to 11,
    characterised in
    that the operation of turning the individual pieces of packaged goods is effected by lifting and lowering said pieces from and on longitudinal transport means.
13. A process according to any one of claims 9 to 12,
    characterised in
    that, during the operation of turning the individual pieces of packaged goods, the previously laterally positioned protrusion is turned towards the rear in the direction of transport.
14. A process according to any one of claims 9 to 13,
    characterised in
    that the protrusions severed from the film bags in front of or behind the pieces of packaged goods are removed towards one side, transversely to the direction of transport.
15. A process according to any one of claims 9 to 13,
    characterised in
    that the protrusions severed from the film bags in front of or behind the pieces of packaged goods are removed downwardly, perpendicularly to the direction of transport.
16. A process according to any one of claims 9 to 15,
    characterised in
    that the longitudinal severance welding operation takes place progressively along the longitudinal sides of the pieces of packaged goods, with the film bags continuously being moved.
17. A process according to any one of claims 9 to 16,
    characterised in
    that, prior to subjecting the film bags to the first transverse severance welding operation behind the pieces of packaged goods, the upper film layer is pressed against the upper side of said pieces.
18. A process according to any one of claims 9 to 17,
    characterised in
    that, prior to the film bags being welded on all sides, the upper film layer, for pressure compensating purposes, is perforated in the region of the initially lateral protrusion and that, during the final second transverse severance welding operation, for the purpose of severing the protrusion, the perforation is severed from the film bag.
19. A process according to any one of claims 9 to 18,
    characterised in
    prior the transverse severance welding operation, the longitudinal dimensions and the height of the individual pieces of packaged goods are recorded by contact-free sensor means.
20. A process according to any one of claims 9 to 19,
    characterised in
    that, prior to the turning operation, the length of the individual pieces of packaged goods is recorded by contact-free sensor means.
21. A process according to any one of claims 9 to 20,
    characterised in
    that, after the first transverse severance welding operation and after the longitudinal severance welding operation, complete severance of the film bags is tested by contact-free sensor means.
22. A process according to any one of claims 9 to 21,
    characterised in
    that, prior to the transverse severance welding operation, the length of the individual pieces of packaged goods, excluding the front and rear protrusions, is recorded by contact-free sensor means.
23. A device for removing, by welding, protrusions at film bags whose width is predetermined with reference to the direction of transport and which contain pieces of packaged goods of variable size,
    characterised by the following features:

    a turning station (55) for turning the individual pieces of packaged goods by 90°;

    a transverse severance welding device (60) for welding and severing a protrusion at a front or rear end face of said pieces, which originally formed a longitudinal side of said pack,

    as well as longitudinal transport means (18, 22, 59, 54, 56) arranged and interlinked linearly.
24. A device according to claim 23,
    characterised in
    that the turning station (55) comprises a plurality of transport rollers (59) which are arranged in a grid in one plane and which, more particularly, are drivable jointly, and that the turning station comprises a liftable hoisting and turning table (57) which is to be turned by at least 90° and which comprises a plurality of apertures (61) which are arranged in a grid and which, in two rotational positions differing from one another by 90°, can be lowered on to the transport rollers (59) in such a way that they penetrate the apertures (61) with upper roller segments.
25. A device according to claim 24,
    characterised in
    that the hoisting and turning table (57) is provided with suction openings (65) which are subjected to a vacuum during the lifting and turning operations.
26. A device according to any one of claims 24 or 25,
    characterised in
    that the transport rollers (59) and the apertures (61) are arranged in a square grid.
27. A device according to any one of claims 24 to 26,
    characterised in
    that the hoisting and turning table (57) is connected to a stepping motor (63) via a hoisting and turning drive (58).
28. A device according to anyone of claims 23 to 27,
    characterised in
    that, directly in front of the transverse severance welding device (60), there is provided a pair of infinite belts or roller sets which drivably rotate transversely to the direction of transport and which run on one another in such a way so as to be separatable from one another.
29. A device according to any one of claims 23 to 27,
    characterised in
    that, directly in front of the transverse severance welding device (60), there is arranged a pair of rollers which separatably run one above the other underneath the transport plane T and whose axes extend transversely to the direction of transport, of which rollers at least one is drivable.
30. A device according to claim 29,
    characterised in
    that directly in front of the second transverse severance welding device (60), there is provided a high-level movable low-pressure strip for introducing a welded-off protrusion between the rollers which are separated from one another.
31. A device according to any one of claims 23 to 30,
    characterised in
    that the rollers of a run-out roller track (56) are coated with gum behind the transverse severance welding device (60) for effectively stopping the film bags.
32. A device for enveloping and welding pieces of packageable goods of variable size in film material, comprising
    means for wrapping the individual pieces of packageable goods in packaging film, so that upper and lower film layers come to rest on the upper sides and lower sides of said pieces;
    a first transverse severance welding device (28) for welding and severing film envelopes at the rear end face and at the front end face of the individual pieces of packaged goods;
    longitudinal severance welding devices (24, 25) for welding film bags and for severing edge strips on at least the longitudinal side of the individual pieces, which devices (24, 25) are arranged at a fixed transverse distance from the opposed longitudinal side of the respective pieces;
    a turning station (55) for turning the individual pieces by 90°;
    a transverse severance welding device (60) for welding and severing a protrusion at a front or rear end face of the pieces, which originally formed a longitudinal side of the pieces;
    as well as longitudinal transport means (18, 22, 59, 54, 56) which are linearly arranged and interlinked relative to one another.
33. A device according to claim 32,
    characterised in
    that the means used for wrapping purposes comprise a device for producing a vertical film curtain which can be pulled off in the direction of transport and which envelopes the pieces of packageable goods from the front end face. (Machine welding on four sides).
34. A device according to claim 32,
    characterised in
    that the means used for wrapping purposes comprise a device for producing an infinite film semi-hose which extends in the direction of transport and which envelopes the pieces of packageable goods from a longitudinal side. (Forming shoulder machine).
35. A device according to any one of claims 32 to 34,
    characterised in
    that the turning station (55) comprises a plurality of transport rollers (59) which are arranged in a grid in one plane and which, more particularly, are drivable jointly, and that the turning station comprises a hoisting and turning table (57) which can be lifted and which can be turned by at least 90° and which comprises a plurality of apertures (61) which are arranged in a grid and which can be lowered on to the transport rollers (59) in two rotational positions which differ from one another by 90° in such a way said transport rollers (59) penetrate the apertures (61) with upper roller segments.
36. A device according to claim 35,
    characterised in
    that the hoisting and turning table (57) is provided with suction openings (65) which, during the lifting and turning operation, are subjected to vacuum.
37. A device according to any one of claims 35 or 36,
    characterised in
    that the transport rollers (59) and the apertures (61) are arranged in a square grid.
38. A device according to any one of claims 35 to 37,
    characterised in
    that the hoisting and turning table (57) is connected by a stepping motor (63) via a hoisting and turning drive (58).
39. A device according to any one of claims 32 to 38,
    characterised in
    that directly in front of the second transverse severance welding device (60) there is provided a pair of infinite belts or roller sets which rotate so as to be drivable transversely to the direction of transport and which run on one another so as to be separatable from one another.
40. A device according to any one of claims 32 to 38,
    characterised in
    that, directly in front of the transverse severance welding device (60), there is arranged a pair of rollers which separatably run one above the other underneath the transport plane T and whose axes extend transversely to the direction of transport, of which rollers at least one is drivable.
41. A device according to claim 40,
    characterised in
    that directly in front of the second transverse severance welding device (60), there is provided a height-adjustable press-down bar for introducing a welded-off protrusion between the rollers which are separated from one another.
42. A device according to any one of claims 32 to 41,
    characterised in
    that, in the direction of transport, directly behind the first transverse severance welding device (28), there is provided a horizontal, vertically movable pressure plate (ventilation plate) (29) above the film tracks.
43. A device according to any one of claims 32 to 42,
    characterised in
    that, in the transverse direction, inside the at least one longitudinal severance welding device (24, 25), there are arranged movable means for perforating at least the upper film layer, which device (24, 25), more particularly, is firmly connected to an upper movable transverse beam of the first transverse severance welding device (28).
44. A device according to any one of claims 32 to 43,
    characterised in
    that the rollers of a run-out roller track (56) are coated with gum behind the second transverse severance welding device (60) for effectively stopping the film bags.

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