EP0924057B1 - Method and apparatus for making two bags simultaneously - Google Patents

Description

The invention initially relates to a method for the simultaneous production of two bags each, in particular vending machine bags from successive ones Cross cutting and cross cutting formed double film web sections one flat-lay tubular film web made of thermoplastic plastic as well as for packets Stack the bags, the double film web sections being separated by a Direction of movement of the tubular film web extending longitudinal cut in two beforehand bags provided with receiving holes are divided by a Transfer device detected and on the spacing of the receiving holes next to each other arranged pins of a stacked moving pin stack conveyor be filed. Such a method and a device for its implementation is in US 5,085,111.

In the manufacture of such bags, especially if they are machine bags , it is particularly important because of the precise fit in the packaging machine that the position of the location holes on the bags is precisely positioned. If not In this case, it is not possible to stack exact bags in the pack, because the Receiving holes in the tubular film web and the pins of the pin stack conveyor are not sufficiently coordinated. This leads to stack formation undesirable malfunctions or the need for the bag making facilities and / or to let the pen stack conveyors run more slowly.

In addition to the exact arrangement of the mounting holes, there are also effects Web width fluctuations of the tubular film web negatively affect the manufacturing tolerances out.

EP 0701895-A describes a machine and a method for producing Plastic bags are known in which the position of a cross cutting device along Direction of movement of the film web is adjusted. A detector near the cross cutter recognizes the contour of recesses in the film web and controls it depending on the position of the cutting device.

The invention has for its object a method for the simultaneous production of two bags each, in particular vending machine bags, made of double film web sections to propose a flat tubular film sheet made of thermoplastic material, by the manufacturing and / or setting inaccuracies of the facilities for Manufacture of the bags and / or stack of bags related disadvantages, which affect the precise location Positioning the bags and thus affect their precise stacking, so quickly be compensated for as much as possible by means of a particularly simple device trained funds.

In procedural terms, this problem is solved in that the Tubular film web and the devices for producing the bags and / or the Bag stacks are automatically controlled relative to each other, the control with the exception of the unwinding area of the tubular film web, that the Tubular film web is guided correctly and the facilities for producing the Bags and / or the stack of bags with respect to a predetermined longitudinal end Marking of the tubular film web driven and opposite the tubular film web are automatically adjusted transversely to their direction of travel.

According to the solution according to the invention, when the position changes, the Tubular film web no longer adjusts it itself, but rather the bag-forming one controlled or stacking facilities themselves. This machine control and Adjustment can be carried out much faster and more accurately than a modulation and adjustment of the tubular film web, especially if it is with comparatively high web speed is moved. Through this simple and in particular quick adjustment of the facilities can be the usual Avoid material loss of the tubular film web and at the same time is the exact positioning for example of receiving holes in automatic bags compared to the Longitudinal cutting edge guaranteed in an optimal manner, so that the handling of Vending machine bags, for example in packaging machines, e.g. B. bread or bread slices pack, is also improved.

The specified marking on the tubular film web can be done in different ways and Can be achieved, for example, in that a serving as a tax mark longitudinal marking line applied to the tubular film web, preferably is printed on. This print can either already be made during the extrusion of the Tubular film web or during its subsequent assembly, i.e. when editing for Formation of bags can be applied.

Another option is to do without a line print entirely, rather one of the two edges or both edges of the tubular film web than to use the specified marking.

Regardless of whether it is a line scan or a conventional one Edge scanning, it is particularly advantageous if the modulation of the Equipment necessary for bag formation during the Bag production takes place several times if necessary. With others Words this means that the sampling and the subsequent modulation if necessary, each in the area of the individual bag-forming devices is made.

In the case of a specific embodiment, this can be done in terms of the device, for example achieve that the modulation via a scanning device in the form of a scanning head, for example in the area of a bottom folding device, a punching device, a slitter and optionally a strip cutter is made, that is, in all known devices that are used for the production of bags, especially vending machine bags, are necessary.

Figur 1

eine Seitenansicht einer Beutelherstellmaschine,

Figur 2

eine Seiten- bzw. Bodenfalten bildende Einrichtung,

Figur 3

eine vergrößerte perspektivische Darstellung einer Streifenschneideinrichtung,

Figur 4

eine perspektivische Darstellung einer Lochstanzeinrichtung,

Figur 5

eine perspektivische Darstellung einer Querschweißtrenneinrichtung zur Bildung von Bahnabschnitten,

Figur 6

eine perspektivische Darstellung einer Bahnüberführungseinrichtung mit einem Teil einer Stapelvorrichtung,

Figur 7

eine perspektivische Darstellung eines Teils der Stapelvorrichtung im Bereich einer Längsschneideinrichtung,

Figur 8

eine perspektivische Darstellung der Stapeleinrichtung nach Trennen der Bahnabschnitte durch die Längsschneideinrichtung zur gleichzeitigen Bildung von zwei Beuteln bzw. Beutelpacken,

Figur 9

eine Vorderansicht der in Figur 8 dargestellten Einrichtung,

Figur 10

eine Aufsicht auf eine erste Ausführungsform eines Doppelfolienbahnabschnitts,

Figur 11

eine abgewandelte Ausführungsform eines Doppelfolienbahnabschnitts,

Figur 12

einen schematischen Verfahrensablauf bei der Konfektionierung mit einer Linienabtastung,

Figur 13

einen entsprechenden schematischen Verfahrensablauf mit einer Kantenabtastung und

Figur 14 und 15

eine Einzelheit der Stapelvorrichtung.

A preferred embodiment of the invention is shown in the drawing and is explained in more detail below. Each shows in a schematic representation:

Figure 1

a side view of a bag making machine,

Figure 2

a device forming side or bottom folds,

Figure 3

2 shows an enlarged perspective illustration of a strip cutting device,

Figure 4

2 shows a perspective illustration of a hole punching device,

Figure 5

1 shows a perspective illustration of a cross welding separating device for forming web sections,

Figure 6

1 shows a perspective illustration of a web transfer device with part of a stacking device,

Figure 7

2 shows a perspective illustration of a part of the stacking device in the region of a longitudinal cutting device,

Figure 8

2 shows a perspective illustration of the stacking device after the web sections have been separated by the slitting device for the simultaneous formation of two bags or bag packs,

Figure 9

6 shows a front view of the device shown in FIG. 8,

Figure 10

a plan view of a first embodiment of a double film web section,

Figure 11

a modified embodiment of a double film web section,

Figure 12

a schematic process flow in the assembly with a line scanning,

Figure 13

a corresponding schematic procedure with an edge scan and

Figures 14 and 15

a detail of the stacking device.

In Figure 1, a bag making machine 1 is shown schematically, for simultaneous Manufacture of two bags, so-called automatic bags, trained and is set up. An unwind stand 2 with a winding roll 3 is part of the machine a tubular film web 4 made of thermoplastic material. The tubular film web 4 is within a processing state 5 indicated only schematically above housed drive rollers and tensioning rollers, not shown. At the Processing stand 5, a marking line printing unit 6 is arranged, on which the Tubular film web 4 is passed and its function explained in more detail below becomes. The processing stand 5 also takes a side or bottom folding insertion device 7 (see FIG. 2) and a strip cutting device 8 (see FIG. 3), the Meaning is explained in more detail below. Behind the processing stand 5 is one Hole punching device 9 arranged (see FIG. 4), the function of which is also shown below is described in more detail. The hole punching device 9 is followed by a cross welding separating device 11 (see FIG. 5) and a transfer device 12, to which a Stacking device 13 with a pin stack conveyor 14 connects. In the area the latter is finally arranged a longitudinal cutting device 15 (see FIG. 7).

The bottom gusset insertion device 7 shown in FIG. 2 has in a manner known per se Side swords 16, through the formation of an air bubble inside the tubular film Side folds 17, which represent a bottom fold in the finished bag, into the Tubular film web 4 can be introduced. The side swords 16 are one Not shown device transverse to the direction of movement of the tubular film web 4th adjustable. The training is such that during the run the tubular film web 4 as a function of one described in more detail below Marking an automatic control and adjustment takes place.

The tubular film web is in the area of the strip cutting device 8 shown in FIG 4 guided over a deflection roller 21. The strip cutting device 8 has one Support rod 22, which is arranged in the left part of the processing station 5. On Support block 23 is adjustably fixed on the support rod 22. The support block 23 supports Spacing-arranged cutting knives 24 which are arranged such that they separate a strip 25 from the top of the tubular film web 4, so that in a gap 26 is formed in the upper web. This way you can use a border create provided bags, d. H. in such bags used as vending machine bags the marginal edges delimiting the bag openings are not at the same height.

The hole punching device 9 shown in FIG. 4 has two adjustment drives 27, via the perforated tools 29 seated on support plates 28 can be actuated, with the aid of which Area of the gap 26 in each case two adjacent bore holes 31 in the tubular film web 4 can be introduced, the meaning below is explained in more detail.

After punching the receiving bores 31, welding is carried out according to FIG of double film web sections 35 by means of the cross seal separating device 11 Cross cut welding device 11 has a lower welding roller 32 and an upper one Welding bar 33, which is movable substantially in the vertical plane. By Activation of the separating welding device 11 when the tubular film web 4 is at a standstill there are separating weld seams 34 which lead to the individual double film web sections 35 lead.

According to Figure 6, these double film web sections from a transfer device 12 taken over, for this purpose radially extending arms 36 has, which is driven by a rotating shaft 38 rotating about a bearing piece 37 become. With the aid of this transfer device 12, the double film web sections can be 35 after rotating through 180 °, place on the stacking device 13, which is only partially shown in FIG. This stacking device 13 has the pin stack conveyor 14, whose pins 39 projecting upwards in pairs corresponding to the distance between the receiving bores 31 in the double film web sections 35 are arranged. In this way, double film web sections can be Place in stacks on the pin stack conveyor 14 in a manner known per se.

With the help of the longitudinal cutting device 15 shown in Figure 7, the on both sides of the Pin stack conveyor 13 depending double film web section 35 in two Cut the bag packs lengthways, as shown in Figure 8. To this end the longitudinal cutting device 15 has two drive units 41 with a cutting bar 42, a cutting knife 43 attached to it, which is essentially in vertical direction can be moved up and down. The two themselves through the Longitudinal cut bag packs are shown in Figures 8 and 9 with 35 a and 35 b referred to.

The cutting knife is used to connect or block the individual bags in packages 43 brought to a certain temperature so that when penetrating of the cutting knife the superimposed edges of each bag stack welded together or fused.

Figures 10 and 11 are two different configurations of bags shown, which is generated by the method and the device according to the invention can be. Figure 10 illustrates with an edge or a lip provided machine bags, in which the upper, defining the bag opening Edges are not at the same level, as seen from the removal of strip 25 Figure 3 and the resulting gap 26 results.

FIG. 11 illustrates the configuration of a double film web section according to perforations 44 have been created by means of a perforator (not shown). After the double film web sections along the line A into two individual bags have been separated, the edges of the bags are level because of the perforation line 44 is formed in both surfaces.

FIGS. 14 and 15 show a spreading device 18 which is in the region of the Pin stack conveyor 14 is arranged and about a common pivot axis 19 has pivotable spreading arms 20. The spreading of the packs of bags is necessary to pack the bags on, not shown, substantially U-shaped trained wire brackets. The wire brackets are hand made from below introduced what was previously not possible on two-track machines.

In Figure 12 is shown in a schematic representation, as with the aid of a scanning device 45 and a marking line 46 on the tubular film web 4 a desired relative Alignment of the bag-forming facilities, in particular with regard to the bottom fold insertion device 7, the strip cutting device 8 and the punching device 9 is made opposite the tubular film web 4. According to that in FIG. 12 The process sequence shown is first on the underside of the tubular film web 4 with the help of the marking line printing unit 6, the marking line 46 on the underside of the Tubular film web 4 applied (see FIG. 12 a).

In cooperation with this marking line 46, for example on the Tubular film web 4 is printed, a probe 47, for example one works Photocell of the scanner 45 together, in such a way that at one Deflection the associated device, so for example the bottom folding insertion device 7 is controlled accordingly. For this purpose, according to FIG. 12 b non-contact scanning head 47 each through a transmission line 49, and with the interposition of known control and amplifier units 51 with the Adjustment device connected. In each case a motor 52 of an actuator 53 and the necessary devices between probe 47 (sensor) and the servomotor 52 are directed according to the respective requirement. As a continuously working control system everyone gives Sensor separate command.

The other devices are adjusted individually. An adjustment is made according to FIG. 12 c when cutting a strip 26 by the strip cutting device 8 and / or in the case of FIG. 12 d when the receiving bores 31 are drilled in The area of the gap 26 in the area of the punching device 9.

Instead of scanning an applied marking line 46, it is also according to FIG. 13 conceivable, the scanning and modulation on the basis of the longitudinal edges 48 to make the tubular film web 4, as is known per se. For the invention is characteristic, however, that the run of the tubular film web 4 is not corrected, but again the appropriate facilities, such as B. the bottom folding insert 7, the strip cutting device 8 and the punching device 9. Not shown, but in the same way, the stack-forming devices, such as z. B. adjust the pin stack conveyor 13.

Claims (11)

1. Method of simultaneously producing in each case two bags, in particular vending-machine bags, from successive double film web sections, formed by transverse welding and transverse severing, of a laid-flat tubular film web (4,) made of thermoplastic material, and of stacking the bags in groups, it being the case that the double film web sections (35) are divided up, by a longitudinal severing cut extending in the movement direction of the tubular film web (4), into two bags which have previously been provided with accommodating bores (31), are gripped by a transfer device (12) and are set down, in a stack-forming manner, on pins (39) which are arranged one beside the other at the spacing of the accommodation bores (31) and belong to a wicket conveyor (14) which moves in keeping with the groups, characterized in that the tubular film web (4) and the devices for producing the bags and/or the bag stacks (35a, 35b) are automatically compensated for relative to one another, the compensation, with the exception of the unwinding region of the tubular film web (4), taking place such that the tubular film web (4) is guided in the appropriate position and the devices for producing the bags and/or the bag stacks (35a, 35b) are activated in relation to a predetermined longitudinally running marking (46, 48) of the tubular film web (4) and are adjusted automatically in relation to the tubular film web (4), transversely to the running direction thereof.
2. Method according to Claim 1, characterized in that a longitudinally running marking line (46) serving as a control marking is applied to, preferably printed onto, the tubular film web (4).
3. Method according to Claim 2, characterized in that the marking line (46) is applied to the tubular film web (4) during extrusion or fabrication.
4. Method according to Claim 1, characterized in that the marking line (46) is applied to the underside of the tubular film web (4).
5. Method according to Claim 1, characterized in that the predetermined marking on the tubular film web (4) is formed by the longitudinally running edges (48) of the latter.
6. Method according to one or more of Claims 1 to 5, characterized in that sensing of the marking line (46) or of the edges (48) of the tubular film web (4) and activation of the devices for producing the bags and/or the bag stacks (35a, 35b) take place a number of times, as required, during the bag-production period.
7. Method according to Claim 6, characterized in that the sensing and the subsequent activation are carried out, if necessary, in each case in the region of the individual devices for producing the bags and/or bag stacks (35a, 35b).
8. Method according to one or more of Claims 1 to 7, characterized in that the double film web sections (35) can be spread apart in the stacking region by a spreading device, in order for it to be possible for wire brackets to be introduced from beneath.
9. Apparatus for implementing the method according to one of Claims 1 to 8, having devices for producing the bags and/or the bag stacks (35a, 35b), namely a bottom-folding device (7), a hole-punching device (9), a transverse welding/severing device (11), a transfer device (12), a wicket conveyor (14), a longitudinal cutting device (15) and, if appropriate, a strip-cutting device (8), characterized by a sensing device (45) and a compensating and adjusting device which is coupled thereto, the compensating and adjusting device being in operative connection with at least one of the devices for producing the bags and/or bag stacks (35a, 35b), with the result that the bag-forming or bag-stacking devices can be aligned relative to the longitudinally running marking (46, 48) of the tubular film web.
10. Apparatus according to Claim 9, characterized in that in each case one sensing device (45) and one activating and adjusting device which is coupled thereto are arranged at least in the region of the bottom-folding means (7), of the hole-punching device (9) and, if appropriate, of the strip-cutting device (8).
11. Apparatus according to Claim 10, characterized in that the sensing device (45) has at least one sensing head (47) which responds to a marking line (46), applied to the tubular film web (4) by a marking-line printer (6), or to the longitudinally running edges (48) of the tubular film web (4).

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