EP0903296B1 - Device for separating bags - Google Patents

Description

The invention relates to a device for separating flat sacks lying in a stack, with a sack magazine in which a stack of sacks lies above with the sack magazine in arranged near the bag openings upper suction means and a drivable rolling grille forming an endless loop, consisting of at least two chains and between the chains transverse bars, the at least one engagement section for a passage of the upper suction means and at least forms a support section for resting a sack, the rolling grille enclosing the sack magazine.

Devices for separating and feeding bags with high specific performance are described in DE 38 40 646 C2. Here, the sacks from the sack stack are initially with their bottom part subtracted from the stack of bags first and then in the opposite direction in a position at a distance above the bag stack Open and push on. A device of this kind has the disadvantage that there is no possibility of devices for signing the isolated sack before opening and attaching accommodate. Such signing, i.e. H. on On stamping, printing or contactless spraying of labels however, is a common user requirement.

EP 0 380 905 A1 describes a device of the type mentioned at the beginning Known at the top suction means in the area of Bag bottom are provided and after lifting a bag Rolling grille from the bottom part towards the bag opening drives in. Using the rolling grille, the sack is then turned into a Move the bag opening unit by about one bag length. Installation space for a marking device seems to be present here; the Handling the isolated sack until it is put on one Filling spout is however complicated and requires a complex one Contraption.

Proceeding from this, the invention is based on the object Device for separating bags that are simple is built and works reliably and at complementary means of signing individual sacks unhindered can be added.

• daß die oberen Saugermittel im Bereich der Sacköffnungen angeordnet sind,
• daß untere Saugermittel vorgesehen sind, die zwischen einen von den oberen Saugermitteln angehobenen vereinzelten Sack und den Sackstapel gegen die untere Sackwandung des vereinzelten Sackes im Bereich Sacköffnung bewegbar sind und
• daß die Laufrichtung des Rollgitters in der Ebene der Saugermittel von der Sacköffnung zum Sackboden hin orientiert ist.

The solution to this is a device of the type mentioned at the beginning, with the following further means:

• that the upper suction means are arranged in the area of the bag openings,
• that lower suction means are provided, which are movable between a raised sack by the upper suction means and the sack stack against the lower sack wall of the separated sack in the area of the sack opening and
• that the running direction of the rolling grille is oriented in the plane of the suction means from the bag opening to the bag bottom.

In the device defined herewith, a sack with the upper suction means in the area of its bag opening by a the engaging portions of the rolling grille are raised therethrough and through the upper and lower suction means on both sides be caught and held securely. Essential for this is the possibility of movement of the lower suction means between the isolated sack and the stack of sacks. Here, the swivel lower suction means in the path previously from the upper Suction devices for gripping and lifting a sack in the area has been passed through twice during its opening. For later When opening the isolated sack, the top and the lower suction means with their suction openings with an intermediate one Sack opposite. When moving the Roller grilles in the direction from the bag opening to the floor area then runs a support section of the rolling grille between the lifted the opening end of the sack and the stack of sacks until the Sack completely on the at least one support section of the Roll grille rests. In this position the individual has Sack a stable base so that a sign on its top can be done. Above that by support rails or a support plate stably supported bag support section of the Roll grids are not functionally essential parts of the device provided for singulation, so that a corresponding Marking device without restrictions in the here Installation space introduced and with the device for separating can be connected. Immediately after signing one occasional and stable supported sacks this can be done without further intermediate feed or transfer without loss of time from the upper and lower suction devices can be opened. Essential this is the possibility of movement of the lower suction means between the isolated sack and the sack stack. Here swivel the lower suction means into the path previously used by the upper suction means for gripping and lifting a sack passed twice in the area of its opening. To the When opening the isolated sack, the top and the lower suction means with their suction openings with an intermediate one Sack opposite.

If the sack is opened sufficiently, it can be placed on the sack support lying open sack with suitable spreading and attachments spread out and attached to a filler neck become.

Suitable suction and gripper means, which also essentially can be used here are in the 196 50 653.0-27 described. Suitable means for spreading and attaching the occasional sacks on a sack filler neck are in the 196 04 718.8-27. To the extent permitted, the content of this Applications referenced, their disclosure content here should be included.

Depending on the size of the sack magazine and the itself the resulting length of the rolling grille is preferably two to three contact areas, each with intervening engagement areas provided on the rolling grille.

After attaching an isolated sack, the sack remains unchanged Position of the rolling grille with a next sack the upper suction means at its opening end and through the engagement section located under the upper suction means pulled through. Then the lower suction means moved against the top. Then the rolling grille moved by one position, again with a support section between the sack to be separated and the sack stack pushes until the entire sack on the at least one support section of the rolling grille.

In a preferred embodiment it is provided that the rolling grille in Area of the suction means forms an inclined ramp to which a horizontal support plane in the running direction of the rolling grille connects. In this way, the degree of lifting necessary of the opening end of the sack to be separated be, since this is from the inside of the the loop formed loop comes out before it over the level of the contact surface is raised. As soon as the one to be separated Sack with the opening end using the upper suction means from the inside of those formed by the rolling grille Loop is led out and the lower suction means in their are brought up, the roller grille can move to be placed between those picked up at the opening end and sack held in from both sides and the stack of sacks retracted to become. Both the upper and lower suction cups medium lead their movements through one in the oblique area Ramp lying engagement section of the rolling grille through out; the rolling grille can only be set in motion, when the upper and lower engagement means in an upper Position are.

In a further embodiment it is provided that the loop formed by the rolling grille essentially modified rectangle by the inclined ramp. In this Way, the rolling grille can be closely adapted to the sack magazine, without significantly increasing the size of the device.

It is further provided that the length of the at least one Engagement section corresponds at least to the length of the ramp and that the length of the at least one support section of the rolling grille at least the length of the guide rails Support level corresponds. At the usual height of the sack magazine the rolling grille preferably comprises three engagement sections and three support sections.

The preferred configuration of the upper suction means is that these are movable in a vertical guide and in the area retractable ramp into the loop of the rolling grille are. By designing the movement of the top Suction means can the engagement sections in the rolling grille relative be kept small.

In a special embodiment of the lower suction means, that these are partially below the sloping ramp are arranged and by the at least one engagement section of the rolling grille through to just above the inclined ramp can be moved. The lower suction means are used to securely hold the sack when moving the Rolling grille when separating to open the already separated Sacks needed. The arrangement is convenient to the Location of the engagement section of the rolling grille in the area of adjusted sloping ramp. The lower suction means are preferably pivoted about a horizontal axis.

The upper and lower suction means can separate the sack open symmetrically to its median plane. Sacks of different Length and width can be handled without any adjustment measures become.

Known spreading and attachment means for spreading the bag opening and for attaching the bag to a bag filler neck are cheaper to the device for separating Adjusted in such a way that the lower end of pivotable Spreading and Aufsteckmittel in the area immediately above the inclined ramp can be swiveled. This is the area held by the upper suction means and the lower suction means and open bag opening into which the spreading and Then insert the plug-in device unhindered from the rolling grille and the Spread the bag open and pick it up.

A preferred embodiment of the invention is in the Drawings and is shown below for better understanding described.

Fig. 1

eine erfindungsgemäße Vereinzelungsvorrichtung mit ergänzenden Aufspreiz- und Aufsteckmitteln sowie einem Sackfüllstutzen in Seitenansicht;

Fig. 2

die Vorrichtung nach Fig. 1 mit Einzelheiten der oberen und unteren Saugermittel;

Fig. 3

die Vorrichtung nach Fig. 1 in Stirnansicht.

Here shows

Fig. 1

a separating device according to the invention with additional spreading and plug-on means and a bag filler neck in side view;

Fig. 2

the device of Figure 1 with details of the upper and lower suction means.

Fig. 3

the device of FIG. 1 in front view.

In Figure 1 is in a machine frame shown only in dashed lines 11 shows a sack magazine 12 in which a stack of sacks lying horizontally on top of each other with the sack opening behind can be inserted facing left. On the left is a column structure 13 is shown in which various handling devices for the bags are stored. The sack magazine 12 is surrounded by a rolling grille 14, which is an endless closed Loop forms over five sets of pulleys 15-19 runs. The rolling grille 14 comprises three not with bars equipped engagement sections 20 and three with each support sections provided with ten bars 21. The rolling grille 14 includes chains 22 and bars 24 connecting them Deflection rollers tension in the side view in the direction of the bars seen essentially a rectangle, however by the arrangement of the pulleys 15, 16 an inclined ramp 23 is generated at the top left corner. The length of the engagement sections 20 corresponds approximately to the distance between the deflection rollers 15, 16 from each other, i.e. H. the length of the ramp 23. The length of the Support sections 21 correspond essentially to the distance between the pulleys 16 and 17. Between these is a Pair of support rails 25, the support section lying thereon 21 stably supported. Above these support rails 25 is space for arranging a marking device for isolated Keep bags free. The rolling grille 14 is by means of a drive roller 28 driven by a belt drive are driven by a geared motor 26, the output effected via an output roller 27. In the area of column construction 13 vertically movable upper suction means 31 are provided, by an engagement section located in the area of the ramp 23 20 between the pulleys 15, 16 in the interior of the Loop retractable and removable from this. they are shown here in a lower position. The upper suction means 31 comprise a vacuum box 33 and a suction opening 32, with which the top sack in the sack magazine 12 at its opening end, that comes to the left in the sack magazine, grasp and from the inside of the loop through the engaging portion 20 pull out. On the machine frame 11 are still in the area the inclined ramp 23 lower suction means 34 can be seen that around a pivotable hollow shaft 36 designed as a suction tube is rotatable are, the lower suction means 34 in a dashed line shown position in a vertically downward direction Position and in a solid position in one through the engaging portion 20 through about 135 ° counter-clockwise pivoted position are shown. In the latter position, the lower suction means 34 with a suction opening 35 the lower sack wall of an isolated Hold on to the sack, which is then moved upwards the upper suction means 31 can be opened. In the area the inclined ramp 23 are spreading blades 37 in two Positions shown that are pivotable about a pivot bar 38 are attached to the swivel arms 39. The spreading vanes 37 are in turn opposite the swivel arms 39 swiveling. To the left of the column structure 13 is in dashed lines a filler neck 51 with flaps not explained here and jaws recognizable, on which a single and from the spreading blades 37 spread bag can.

In Figure 2, the upper suction means 31 and the lower suction means 34 again as details and thus easily recognizable shown. The upper suction means 31 are in here shown an upper position, the suction opening 32 slightly lies above the support plane of the rolling grille 14. The lower Suction means 34 are shown in two positions as shown in Figure 1; in the solid line shown by 135 ° counterclockwise swiveled position they lie on the upper suction means 31 at. The upper suction means 31 are from this position to go up another amount so that the bag opening is opened by placing the bottom bag wall in the vicinity the opening is held by the lower suction means 34 and the top bag wall near the bag opening from the top Suction means 31 from the first-mentioned lower sack wall is subtracted. As far as further figures in Figure 2 are entered, is related to their description referenced with Figure 1.

3 shows the machine frame 11 with the column structure 13 again shown in dashed lines. Of the different Parts of the rolling grille drive are one of the left Deflection rollers 15, 16 and 19 and on the right one of the deflection rollers 17 and 18 and the driven roller 27 and the drive roller 28 shown. The sack magazine 12 can also be seen. The upper suction means 31 are in the center of the machine frame 11 shown with the vacuum box 33 and the suction opening 32. The upper suction means 31 are in their uppermost and partial shown in its lowest position and in an intermediate position indicated by dashing before opening the sack. The upper suction means 31 are in a guide device 49 stored in the column structure 13 and by means of an actuating cylinder 50 vertically adjustable. By extending a position cylinder 53 the middle position of the upper suction means is reached. The pivotable hollow shaft is of the lower suction means 34 36 recognizable, on the via an angle lever 41, an actuating cylinder 42 attacks with which the lower suction means 34 is pivoted can be. In addition to the suction means there are gripper means 44 shown, which are also attached to the swivel bar 38, on which, via a tab 45, an actuating cylinder, not shown here can attack to twist the pivot beam 38. The gripper means 44 comprise two pivot arms 46 which are independent from each other in the longitudinal direction of the swivel bar 38 for adjustment can be adjusted to the bag width. At the bottom End of the swivel arms 39 are adjustable in pairs against each other Clamping jaws 47 are provided which can be actuated via actuating cylinders 48 are. With these jaws 47, the occasional Bags can be detected in the area of their gussets. Independently represented by the swivel beam 38, but connected to it, is one of the expansion blades 37 open to spread Sacks shown, the first together with the swivel arms 39 is pivotable about the pivot bar 38 and the second compared to this by a rotating beam 40 connected to it again is pivotable. The lower suction means are over a manifold 43 attached to the hollow shaft with negative pressure acts on the upper suction means via a flexible line 52.

Claims (8)

1. A device for isolating bags resting on one another in a flat condition in the form of a stack, having a bag magazine (12) in which the stack of bags is positioned, having upper suction elements (31) arranged above the bag magazine (12) in the vicinity of the bag openings, and having a drivable rolling grid (14) which forms an infinite loop and consists of at least two chains (22) and grid bars (24) positioned transversely between the chains, and which forms at least one engagement portion (20) to allow the passage of the upper suction elements (31) and at least one supporting portion (21) to accommodate a bag, wherein the rolling grid (14) encloses the bag magazine (12),
   characterised in

   that the upper suction elements (31) are arranged in the region of the bag openings,

   that there are provided lower suction elements (34) which are movable between an isolated bag lifted by the upper suction elements (31) and the stack of bags against the lower bag wall of the isolated bag in the region of the bag opening, and

   that the running direction of the rolling grid (14) in the plane of the suction elements (31, 34) is orientated from the bag opening towards the bag base.
2. A device according to claim 1,
   characterised in
   that, in the region of the suction elements (31, 34), the rolling grid (14) forms an inclined ramp (23) which, in the running direction of the rolling grid (14), is adjoined by a horizontal supporting plane.
3. A device according to claim 2,
   characterised in
   that, in the region of the horizontal supporting plane, there are arranged supporting rails (25) for firmly supporting a bag resting thereon below the rolling grid (14).
4. A device according to any one of claims 2 or 3,
   characterised in
   that the rolling grid (14), if viewed in the direction of the grid bars (24), substantially forms a rectangle modified by the inclined ramp (23).
5. A device according to any one of claims 2 to 4,
   characterised in
   that the length of the supporting rails (25) corresponds at least to the length of a supporting portion (21) and that the length of the ramp (23) substantially corresponds to the length of an engagement portion (20).
6. A device according to any one of claims 1 to 5,
   characterised in
   that the upper suction means (31) are movable in vertical guiding means and that, in the region of the inclined ramp (23), they are movable into the infinite loop formed by the rolling grid (14).
7. A device according to any one of claims 1 to 6,
   characterised in
   that the lower suction means (34) are pivotable around a horizontal axis.
8. A device according to any one of claims 1 to 7 with expanding and slipping-on means (37) for expanding the bag opening and slipping the isolated bag on to a filling sleeve (51),
   characterised in
   that the pivotable expanding and slipping-on means (37) can be pivoted into the region directly above the ramp (23).

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