EP0630743A1 - Machine for continuous manufacture of wrappers, pouches, envelopes, etc. - Google Patents

Abstract

The invention relates to a machine for the continuous manufacture of wrappers, pouches, envelopes and similar products (1'), consisting in particular of paper, having at least one front part (2), one rear part (4) and having a stationary bottom consisting of at least one bottom flap (7, 10) and optionally having a closure flap (9), the machine (44) including a plurality of stations for the production of precreases (13-18, 25-27 or 31-34, respectively), for trimming the contour and for gluing and folding and for cutting off web-shaped material (40) or, respectively, for the corresponding processing of an individual blank (1) or preform (1''). The nucleus of the invention lies in the fact that a fold-back device (45, 45') is provided for the backwards displacement of a bottom flap (10) in a zig-zag shape, directed opposite to the transport direction. <IMAGE>

Description

The invention relates to a device for the continuous production of envelopes, bags, mailing bags and the like, in particular made of paper. Like. With the features of the preamble of claim 1.

Devices are known with the aid of which it is possible to continuously carry envelopes, pouches, mailing bags and the like. The like. To produce from individual blanks or from sheet-like material, the envelopes, bags or mailing bags can be made with or without side gussets as well as with side gluing or with central gluing, and they each have a folded and glued, square stand base, which can also be used as a block - or Kreuzboden is called. For the production, the blank or the sheet-like material is first pre-broken and cut to the required extent, glued, folded, separated, prefabricated into a tubular blank and finally closed on the bottom side. For this purpose, the device consists of several stations which are coordinated and work together in terms of their mode of operation and function. Above all, the station used to produce the block or stand base and its device parts are complex and complicated and it is difficult to achieve the same high number of pieces per minute as in the other stations of the device.

The invention has for its object to design a device of the type mentioned so that a continuous production of envelopes, bags, mailers and. Like. Is possible with block or cross bottoms, wherein the bottom formation steps take place during a continuous longitudinal conveyance and the previously known, complicated block bottom formation is avoided. The part device used to form the block bottom should therefore be as simple and uncomplicated as possible and allow a high working speed.

To achieve this object, the invention provides that a zigzag fold-back device is provided for zigzag-shaped, backward movement of a bottom flap.

The zigzag fold-back device is additionally arranged as a special station in the device used to manufacture the envelopes, pouches, mailing bags or the like and is effective without causing an interruption in production. The parts also maintain their position when they pass through the zigzag folding device and do not have to be rotated or turned for this purpose. The Refolding process takes place continuously and automatically at the same speed as the production in the other stations of the device.

The zigzag folding back takes place after the web serving as the starting material or the blank serving as the starting material has received a tubular shape.

According to a preferred embodiment, at least one suction element is provided and engages on a foldable bottom flap and lifts it up substantially parallel to the transport plane, while the tubular cut or the material web brought into the form of a tube is continuously moved on. At the same time, at least one folding knife fixes a pre-folding with its folding cutting edge, so that the bottom flap can then lie on the part to be produced after the suction element has been lowered. The web or blank is moved further while the suction element lowers and the suction element finally releases the bottom flap as soon as the zigzag-shaped folding process is completed.

In a further development of the invention, a plurality of suction elements which are effective at the same time and a plurality of folding knives which are also effective at the same time are provided in order to ensure that the bottom flap is properly folded back in a zigzag fashion.

Further features of the invention emerge from dependent claims in connection with the description and the drawing.

Fig. 1 :

eine Abwicklung eines Zuschnitts von einem Umschlag, Beutel bzw. von einer Versandtasche;

Fig. 2:

eine Darstellung der verschiedenen Verfahrensschritte bei der Herstellung von Umschlägen, Beuteln bzw. Versandtaschen unter Verwendung einer erfindungsgemäßen Vorrichtung;

Fig. 3:

in kleinerem Maßstab eine schematische Seitenansicht einer Vorrichtung zum Herstellen von Umschlägen, Beuteln, Versandtaschen u. dgl.;

Fig. 4:

in größerem Maßstab eine schematische Seitenansicht der Rückfaltvorrichtung zum Arbeiten an bahnförmigem Werkstoff;

Fig. 5:

schematisch in nochmals größerem Maßstab sowie in Seitenansicht eine Einzelheit der Rückfaltvorrichtung aus Fig. 4 mit dem Saugelement beim Ansaugen der vorlaufenden, zickzackförmig rückfaltbaren Bodenklappe und mit dem Falzmesser in der hinteren oder Warteposition;

Fig. 6:

eine Einzelheit wie in Fig. 5 mit angehobenem Saugelement, wobei zugleich das Falzmesser mit seiner Falzschneide am Rückfaltvorbruch anliegt;

Fig. 7:

eine Einzelheit wie in den Figuren 5 und 6, wobei das Saugelement wieder nahezu abgesenkt ist und das Falzmesser mit seiner Falzschneide noch vor dem Zurückschwenken an dem Rückfaltvorbruch anliegt;

Fig. 8:

schematisch eine Draufsicht auf wesentliche Elemente der Rückfaltvorrichtung;

Fig. 9:

in größerem Maßstab eine schematische Darstellung wie in Fig. 4 von einer abgewandelten Ausführungsform für einzeln zu verarbeitende, schlauchförmige Rohlinge.

The invention is described below with reference to exemplary embodiments which are illustrated in the drawing. Show:

Fig. 1:

a processing of a blank from an envelope, bag or from a mailing bag;

Fig. 2:

a representation of the various process steps in the production of envelopes, bags or mailing bags using a device according to the invention;

Fig. 3:

on a smaller scale a schematic side view of a device for producing envelopes, pouches, mailers and. the like;

Fig. 4:

on a larger scale, a schematic side view of the refolding device for working on sheet material;

Fig. 5:

schematically in a still larger scale and in side view a detail of the fold-back device from FIG. 4 with the suction element when sucking in the forward, zigzag-foldable bottom flap and with the folding knife in the rear or waiting position;

Fig. 6:

a detail as in Figure 5 with the suction element raised, the folding knife at the same time resting with its folding blade on the pre-folding.

Fig. 7:

a detail as in Figures 5 and 6, wherein the suction element is almost lowered again and the folding knife with its folding blade is still against the pre-folding before pivoting back;

Fig. 8:

schematically shows a plan view of essential elements of the refolding device;

Fig. 9:

on a larger scale, a schematic representation as in Fig. 4 of a modified embodiment for individually processed, tubular blanks.

A blank 1 for an envelope, bag, mailing bag or the like called product 1 'below. 1 comprises a front part 2 e.g. with a closure flap 3 and two back part halves 5 and 6 forming a back part 4 and a bottom flap 7 and bottom flap halves 8, 9 each arranged on the bottom on the back part halves 5, 6. As soon as the two back part halves 5, 6 are connected to one another by means of central adhesive, there is instead the cut 1 a tubular blank, the two bottom flap halves 8, 9 forming a bottom flap 10 belonging to the back part 4, which is shown in FIG. 2 (method step E) lying on top.

The blank 1 also has a side part 11 or 12 between the front part 2 and the two back part halves 5, 6. These side parts 11, 12 serve to form side folds, for which purpose there are also a plurality of pre-creases in the form of a front longitudinal pre-cut 13 or 14, a back part - longitudinal pre-cut 15 or 16 and one each mean longitudinal protrusion 17, 18 are provided. The longitudinal breaks 13 - 18 divide the side parts 11 and 12 into two longitudinal strips 19 and 2o or 21 and 22, each of which results in side folds 23, 24 in pairs, as is also shown in FIG. 2 (method step L).

Finally, the blank 1 has several cross-cuts. These include a transverse flap protrusion 25, a transverse flap bottom flap 26 and transverse protrusions 27 and 28 located in its extension, which limit the halve flap halves 8, 9. The bottom flap protrusion 26 also extends in a straight line through bottom side flaps 29, 3o, which are located in an extension of the side parts 11, 12.

Also, angle protrusions 31, 32 are provided on the bottom in the side parts 11, 12, and in each case a fold-back protrusion 33 or 34 extends parallel to the transverse protrusions 27, 28 on the base side across the back part halves 5, 6 from their respective outer edge 35, 36 to the respective one Interface 37, 38 of the angle breaks 31, 32 with the respective middle longitudinal breaks 17, 18 of the side parts 11, 12.

The manufacturing process for the production of a product 1 'consists according to Fig. 2 when using web-like material 4o e.g. from the following process steps.

According to method step A, the longitudinal breaks 13-18 as well as the transverse breaks and the angular breaks are first introduced into the material 40. Then the necessary cuts according to the process step B is generated and in method step C the side flap 6 is provided with a glue trace 41 on its inside. In method step D, the side flaps 5 and 6 are folded over, so that a tubular web piece 42 is formed in accordance with method step E. The two bottom flap halves 8 and 9 now together form a bottom flap 10 on the back.

In the next method step X, the bottom flap 1o is set back zigzag parallel to the surface of the tubular web piece 42 against its transport direction (arrow A) in the direction of the arrow b, whereby the bottom flap 1o consisting of the two bottom flap halves 8,9 on the two back part halves forming the back part 4 5, 6 comes to rest. At the same time, the two bottom side flaps 29, 3o fold outwards. This method step X takes place either according to FIG. 2 when the tubular web piece 42 is still connected to the web-shaped material or on an already separated tubular blank 1 ″ according to FIG. 9. The products 1 ′ are separated according to FIG. 2 between process steps Y and F and thus after process step X. However, a blank 1 ″ can also be cut off before process step X.

In the further process steps J, Y, F, K and L, the various parts are glued, folded over and glued to one another to the extent necessary in each case until finally the finished product 1 'according to process step L is present. When the bottom flap 1o is moved back in a zigzag shape, it swings around the folds 33, 34 (Fig. 1) and lies not only on the tubular web piece 42, but also on a with folded back part - transverse strip 43, which is between the cross-folds 27 and 28 on the one hand and the fold-back folds 33, 34 on the other hand according to 2, (process step E). This back part - transverse strip 43 is a back-folding part that serves as a swivel arm for the bottom flap 1o.

Several stations of a device 44 for carrying out the method according to FIG. 2 are shown schematically in FIG. 3. This device 44 also includes a fold-back device 45 for carrying out the zigzag-shaped fold-back process relating to the bottom flap 10. Only this is of interest in the context of the present invention.

According to FIG. 4, the folding-back device 45 comprises a deflection roller 47 mounted in the frame walls 46 for the web-like material 4o, this web-shaped material 4o being fed to the deflection roller 47 in the form of still connected, tubular web pieces 42. Furthermore, a work roller 48 and a pair of pressure rollers 49, 50 and guide elements 51, 52 and 53 and 54 are provided in front of and behind the work roller 48, respectively.

The fold-back device 45 also has at least one suction element 55 and a folding knife 56. Both the suction element 55 and the folding knife 56 are arranged on arms 57 and 58, respectively. The suction element 55 and the folding knife 56 are pivotally mounted around the respective arm 57 or 58 as a radius. This happens around swivel axes 59, 6o, on each of which a suitable drive, not shown in the figures, engages.

According to the top view in FIG. 8, three folding knives 56 are arranged with their holders 61 on the swivel axis 6o. Two folding knives 56 are each located far outside and are effective in the area of the edges of the tubular web pieces 42. 8 there are also a plurality of suction elements 55 which are directed toward the work roll 48 with their suction openings and which may furthermore have fingers 62 which are mechanically effective. A folding plate 63 (FIG. 8) can also be provided instead of a centrally arranged suction element.

The function and mode of operation of the folding-back device 45 is clear above all from the illustrations in FIGS. 5, 6 and 7.

According to FIG. 5, there is a tubular track piece 42, not yet separated from the sheet-like material 4o (FIG. 2), between the two guide elements 51 and 52 and, with its bottom flap 1o advancing in the transport direction a, lies directly under the suction element (s) 55 Suction opening 64 of the suction element (s) 55 is located directly above the bottom flap 10. The other bottom flap 7 of the tubular web piece 42 lies on the work roll 48. Between the two bottom flaps 7 and 1o are the partially folded bottom side flaps 29, 3o, of which one bottom side flap 3o can be seen in FIGS. 5 and 6. According to the working position shown in FIG. 5, the suction element (s) 55 are in a lowered position, while the folding knife (s) 56 are still in their position rear or waiting position.

6, the suction element (s) 55 have raised the bottom flap 10 into a position parallel to the transport direction a or to the transport plane Z in the region of the work roll 48, the back part transverse strip 43 (see also FIG. 2, method step E) in one standing position has reached the level of the tubular track piece 42.

At the same time, the bottom side flaps 29, 30 pivot. Furthermore, the folding knife 56 pivots or it pivots the folding knives 56 into their working position and, with their folding knife edges 65, lie against the fold-forward protrusion 33 and 34, respectively, between the back transverse stripe 43 or the back-fold-back part 43 and the other bottom flap 7 are arranged (Fig. 6).

In the next work step, the suction elements 55 lower again according to FIG. 7, while the folding blades 56 still move with the tubular track piece 42, so that the folding blade cutting edge 65 lies against the folding-back pre-bridges 33, 34 for as long as possible. At the same time, the back part transverse strip 43 / the back fold back part 43 swivels clockwise from the position according to FIG. 6 into the position according to FIG. 7 and finally lies down on the back part 4 when the suction element (s) 55 are pivoted back. At the same time, the bottom flap 1o has laid on the back part transverse strip 43 / the back refolding part 43, with which the zigzag folding back process of the bottom flap 1o has ended.

While the suction elements 55 lift the bottom flap 10, the tubular web piece 42 moves further in the transport direction a, and when the suction element (s) 55 lower the bottom flap 10 again, the folding back process is completed. The folding blades 56 have a largely only stabilizing function.

As FIGS. 4-7 also show, the arms 57 of the suction elements 55 and the arms 58 of the folding blades 56 are each arranged approximately perpendicular to one another in the waiting and in the working position. Furthermore, the pivot axes 59, 60 of the suction elements 55 and the folding knife 56 lie parallel to the transport plane of the tubular web pieces 42 and transversely to the transport direction a of the web pieces 42. The folding knife 56 finally each has a folding knife edge 65 pointing in the transport direction a.

While FIGS. 4-7 relate to a fold-back device 45 when working on still connected tubular web pieces 42, FIG. 9 shows a fold-back device 45 'for tubular blanks 1' 'which have already been cut into individual pieces. The suction elements 55 and the folding knives 56 as well as their storage and their drives do not differ from those of the fold-back device 45. The only difference is that the work roll 48 'has a suction device 7o with suction openings 71 on its circumference or a gripper device so that the individual , tubular blanks 1 '' are securely held on their circumference. Furthermore, additional guide rollers 72 and guide elements 73 are provided in order to ensure proper functioning.

Details of the suction device 7o or the gripper device are of no interest here and are generally known.

The product 1 'is an envelope, the back part 4 of which consists of two back part halves 5 and 6, which are connected to one another by means of central adhesive. The back part 4 can, however, also be in one piece and connected to one or the other side part 11 or 12 by means of side gluing. It is also possible that the product 1 'has no side folds 23, 24 (see FIG. 2, method step L). The products 1 'can thus be designed differently, and nevertheless a Z-shaped or zigzag-shaped refolding of the one bottom flap 1o is possible with the aid of the back part transverse strip 43 or the back refolding part 43. The invention is therefore not limited to the use of certain products and also not to the specifically illustrated exemplary embodiments, rather further modifications are possible without deviating from the basic inventive idea.

This also includes those embodiments of the invention according to which the suction elements 55 execute a linear or at least partially linear lifting movement. It is also possible to use a work roll 48 'with its suction device 7o according to FIG. 9 in conjunction with the fold-back device 45 according to FIGS. 4-7.

Claims (11)

Device for the continuous production of envelopes, bags, mailers and the like, in particular made of paper. Like. Products (1 ') with at least one front part (2), a back part (4) and with a stand base consisting of at least one bottom flap (7, 1o) and optionally with a closing flap (9), the device (44) having several Stations for generating pre-breaks (13 - 18 or 25 - 27 or 31 - 34), for trimming the contour and for gluing and folding as well as for cutting off sheet material (4o) or for processing a single blank (1) or blank (1 ''), characterized in that
a fold-back device (45, 45 ') is provided for zigzag-shaped, backward movement of a bottom flap (1o). Device according to claim 1, characterized in that the fold-back device (45, 45 ') comprises at least one suction element (55) and one folding knife (56). Device according to one or more of the preceding claims, characterized in that a plurality of suction elements (55) and a plurality of folding knives (56) are provided. Device according to one or more of the preceding claims, characterized in that the suction elements (55) and the folding blades (56) are each arranged on arms (57, 58) and are pivotably mounted around the arms (57, 58) as a radius. Device according to one or more of the preceding claims, characterized in that the arms (57) of the suction elements (55) and the arms (58) of the folding blades (56) are each arranged approximately perpendicular to one another in the waiting and in the working position. Device according to one or more of the preceding claims, characterized in that the swivel axes (59, 60) of the suction elements (55) and the folding knife (56) parallel to the transport plane of the tubular web pieces (42) / tubular blank (1 '') and transversely are arranged for the transport direction of the web pieces (42) / blanks (1 ''). Device according to one or more of the preceding claims, characterized in that the folding knife (56) has a folding knife edge (65) pointing in the transport direction. Device according to one or more of the preceding claims, characterized in that the folding knife (56) engages on a pre-folding fold (33, 34) of a back folding part (43). Device according to one or more of the preceding claims, characterized in that the suction elements (55) act on the rear bottom flap (1o). Device according to one or more of the preceding claims, characterized in that the suction element (55) engages the bottom flap (1o), lifting it in a parallel position to the transport plane and further transporting the tubular web piece (42) / the tubular blank (1 '') is set back and then lowered and driven. Device according to one or more of the preceding claims, characterized in that the suction elements (55) perform an at least partially linear lifting movement.

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