EP2024235A1

EP2024235A1 - Vertical bagging machine comprising two linear motors

Info

Publication number: EP2024235A1
Application number: EP07723678A
Authority: EP
Inventors: Roman Kammler; Ralf Bardtke; Walter Baur
Original assignee: Rovema Verpackungsmaschinen GmbH and Co KG; Rovema GmbH
Current assignee: Rovema GmbH
Priority date: 2006-05-12
Filing date: 2007-03-28
Publication date: 2009-02-18
Also published as: US20090260333A1; DE102006022193B4; US7866131B2; WO2007131572A1; DE102006022193A1

Abstract

The invention relates to a vertical bagging machine (1), equipped with a first linear motor (18) for displacing a transversal seal unit (10) in a first direction, preferably vertically (20), and a second linear motor (19) for executing a displacement in a second direction, preferably horizontally (21 ), in order to displace a heat-sealing jaw (11) in the latter direction or to cause two heat-sealing jaws (11, 12) to be displaced against one another by means of a gear (22). The linear motors (18, 19) are interconnected (23) by means of a cross formation. Each linear motor (18, 19) consists of a primary part (24, 26) and a secondary part (25, 27). The cross formation (23) forms a stable connection for the linear motors (18, 19) that act in displacement directions running perpendicularly to one another.

Description

Vertical tubular bag machine with two linear motors

The invention relates to packaging machine construction and there a vertical bagging machine. Such packaging machines are well known.

DE 195 35 510 A1 discloses a vertical tubular bag machine with a film web drawn off from a supply roll by means of a take-off. In this case, a forming shoulder is used for forming the film web into a film tube and a format tube for receiving and filling the film tube. A longitudinal sealing device is provided for welding the longitudinal edges of the film web and for producing a longitudinal seam of the film tube. A transverse sealing device with two sealing jaws movable relative to one another is used to produce transverse seams on the film tube and a separating device for separating the generated tubular bag from the film tube. A mechanism is provided for holding the sealing jaws, and a drive for moving the transverse sealing device to move the sealing jaws relative to each other. In order to open and close the transverse sealing device on the one hand very quickly and on the other hand transverse sealing device to move up and down to allow rapid transverse welding of a continuously moving film tube has in this known flow wrapper the drive on two linear motors, of which the first linear motor for a movement of the transverse sealing device in a first direction (the vertical) is provided, and the second linear motor for exerting a movement in a second direction (the horizontal) is used to move a sealing jaw in this direction, or both sealing jaws via a gear to cause an opposite movement. The linear motors are connected to each other via a connection, and each linear motor consists of a primary part and a secondary part. Transmissions for producing an opposing sealing jaw movement are known in great variety.

The known drive has the disadvantage that a part of a linear motor is directly connected to a part of the other linear motor, resulting in a low stability of the entire drive.

It is the object of developing a vertical tubular bag machine of the type described above so that this disadvantage is eliminated.

The object is solved according to the characterizing part of claim 1. Thereafter, a cross is provided as a connection between the linear motors, the two bars extending transversely to each other. On the opposite sides of the cross, on the one hand, a part of the one linear motor and, on the other hand, a part of the other linear motor are fastened to the different beams. On the opposite sides, a guide is also provided parallel to a beam. A part of a linear motor is attached to a stationary mount. His other part is attached to one side of the cross. Part of the other linear motor is attached to the other side of the cross, and its other part is movable relative to this part and connected to the transverse sealing device. At the parts which are not attached to the cross, at least one carriage for moving the part along a guide is provided in each case.

The proposed innovation has the advantage that the drive is very stable. The two parts of the different linear motors are mounted on opposite sides on the cross and form together with the cross a stable design. While a linear motor is used for moving, preferably for raising and lowering the cross, the transverse sealing device is closed and opened by operating the other linear motor. The bars of the cross hold the perpendicular to each other acting parts of the different linear motors.

Advantageous embodiments of the tubular bag machine according to the invention are described in claims 2 to 15.

If, according to claim 2, the secondary parts of the linear motors are firmly connected to the cross, the assembled cross is relatively light and therefore movable with relatively little drive energy. Then a stationary primary moves the cross. The power supply and the cooling of the primary part can be carried out in an advantageous manner also stationary. The second primary part is then movable relative to the cross. This has the advantage that its heat can be better dissipated when it is freely movable. In addition, its thermal expansion does not disturb the cross. The same applies to the stationary primary part whose heat dissipation hardly heats the cross. A relatively heated cross could result in an inaccurate seal jaw orientation due to its thermal expansion, which could result in leaky cross seams.

Are the guides attached to the cross (claim 3), so they stabilize the cross. A hardened guide surface increases their service life. Sliding bearings, rolling bearings, ball bearings, roller bearings or guided wheels can be used on the guides. As a guide are two mutually parallel rails (claim 4). These can be connected along their entire length with a beam to give it a higher stability. In a particularly preferred embodiment, they can each be made in one piece with the two beams or the entire cross in order to stabilize even more. In addition, a very high stability of the entire drive can be achieved by a full-surface adhesion of the parts to be cross-linked with the linear motors (claim 6).

The cross and the connection to the sealing jaws are guided in a safe manner if, according to claim 5, four carriages are provided on each part movable along a guide, two carriages each being guided along a common rail.

Does the cross on its opposite sides in each case a material recess with this limiting edge on (claim 7), the cross is very easily executed. The edges increase the soapy of the cross. In this case, the entire drive is designed to be very compact, when the parts firmly connected to the cross are each provided in a material recess (claim 8).

Extend according to claim 9, the firmly connected to the cross parts along the j eweiligen beam and run between the rails, so a compact, stable design is achieved, both beams and thus the cross are relatively easy. A further weight saving is achieved if the cross of a light metal, in particular aluminum or magnesium, consists (claim 10).

Is there at least one secondary part of a series of juxtaposed, separate secondary part segments, the secondary segments are each connected by means of a fastening to the cross (claim 1 1), it is achieved that it is at different expanding components as a result of heating of the magnet equipped secondary part not to warping or deforming the cross is coming. Since the secondary part becomes warmer than the beam bearing it, the secondary part has a greater thermal expansion than the beam if the materials of the secondary part and of the beam are the same or if the secondary part has a greater coefficient of linear expansion than the beam or the cross. Alone by a loose juxtaposition of the secondary segments this is allowed to press against each other after a thermal expansion to close the sum of all gaps between them, which occur solely for assembly reasons, and so compensate for a total of a greater linear expansion. Consequently, there is no curvature of the cross, which usually expands to a lesser extent, since it is not as hot as the secondary segment segments.

For assembly reasons, it makes sense that each secondary segment is connected via its own bottom part or a separate housing with the cross (claim 12). Then the material of the bottom part or of the housing and an intervening gap for the heated length expansions are relevant.

Lying according to claim 13, the bottom parts or the housing at room temperature tight or to form a gap to each other and has the material of the bottom parts or the housing has a smaller, in particular significantly lower coefficient of linear expansion than the material of the cross, the cross is also distorted not with heating of the secondary part and heating by heat conduction to the cross. By significantly less is meant that the cross expands at a done by operation of the secondary part heating by a greater difference in length than the secondary part. Is provided as the material of the bottom parts or the housing steel and as a material of the cross aluminum (claim 14), it is achieved on the one hand that the cross is relatively easy, and therefore is movable without much energy expenditure, and on the other hand that it expands with a larger coefficient of linear expansion than the secondary parts. A Curvature of the cross does not occur in such a way. As a rule, no gap must be provided between the secondary parts.

Finally, the length expansion can not be fully considered when heated if according to claim 15, the bottom parts or the housing at room temperature in each case bear against each other to form a gap. For those commonly used in mechanical engineering, such as steel, aluminum and magnesium, gaps with a width of about 10 micrometers are generally sufficient.

As attachment is z. B. a screw or a local bonding.

In the following, the proposed vertical tubular bag machine will be described with reference to embodiments illustrative figures. It shows:

FIG. 1 is a side view of a cross, on the vertically aligned beam of which two rails are formed, between which a secondary part of a first linear motor extends, a stationary primary part sitting this linear motor on the rails in order to displace the cross in the vertical direction;

FIG. 2 is a sectional view of the cross of FIG. 1 cut along A-A of FIG. 1;

Figure 3 is a side view of the subject of Figure 1, but with something relative to the stationary primary part up set cross;

Figure 4 is a side view of the back of the cross of Figure 1, wherein on the horizontally oriented beam, a secondary part of a second linear motor is mounted to move a primary part along horizontally oriented rails, and additionally with a transverse sealing device of a vertical tubular bag machine whose sealing jaws are separated from each other by a horizontal movement of the primary part;

Figure 5 in a 90 degrees offset to the view of Figure 1

View the cross of Figure 1;

Figure 6 is a side view of a vertical bagging machine whose transverse sealing device by means of a drive according to the figures 1 to 5 moves in the vertical direction and also opened and closed;

Figure 7 is a side view of a cross with two perpendicularly acting linear motors according to Figure 1, but with secondary parts, consisting of a series of separate, each connected to the cross secondary part elements;

Figure 8 is a sectional view of the cut along B-B of Figure 7 object of Figure 7;

FIG. 9 shows a side view of the rear side of the object of FIG

FIG. 7 with the transverse sealing device of FIG. 4;

FIG. 10 shows a sectional view of the secondary part for the actuation of the transverse sealing device of FIG. 9 at a low operating temperature of the secondary part;

Figure 1 1 in a sectional view of the secondary part of Figure 10, but at a higher operating temperature, and

12 shows a sectional view and in a magnification of a detail of the subject of Figure 1 first

In a vertical tubular bag machine 1 with a withdrawn from a supply roll 2 by means of a trigger 3 to a Umlenkrol- Ie 38 deflected film web 4 is a forming shoulder 5 for forming the film web 4 to a film tube 6 and a format tube 7 for receiving and filling the film tube 6 (Figure 6). A longitudinal sealing device 8 is provided for welding the longitudinal edges of the film web 4 and for producing a longitudinal seam 9 of the film tube 6. A transverse sealing device 10 with two mutually movable sealing jaws 1 1, 12 is used to produce transverse seams 13 on the film tube 6 and a separator 14 for separating the generated tubular bag 15 from the film tube 6. A mechanism connected to a fastening 39 16 holds the sealing jaws 11, 12 ( FIG. 4, FIG. 6). By means of a drive 17, the transverse sealing device 10 is opened and closed and moved up and down to produce two transverse seams 13 simultaneously and along with the continuously moving down film tube 6. During this welding process, the sealing jaws 1 1, 12 are closed. Subsequently, they are separated from each other and the transverse sealing device 10 is moved upwards, there to start at a distance of a bag length again a welding of transverse seams 13 in the compressed film tube 6.

A drive 17 for moving the transverse sealing device 10 has two linear motors 18, 19 (FIGS. 1 to 5). The first linear motor 18 is provided for movement of the transverse sealing device 10 in the vertical 20. The second linear motor 19 serves to exert a movement in the horizontal 21 in order to move the sealing jaws 1 1, 12 in this direction in opposite directions. In this case, both sealing jaws 11, 12, caused by a known conventional transmission 22 to an opposite movement, when a primary part 26 of the second linear motor 19 is reciprocated. The linear motors 18, 19 are connected to each other via a cross 23. Each linear motor 18, 19 consists of a primary part 24, 26 and a secondary part 25, 27. The two bars 28, 29 of the cross 23 are arranged transversely to each other. On the two opposite sides of the cross 23 In each case, a secondary part 25, 27 of a linear motor 18, 19 attached to a different beam 28, 29. In addition, a guide 30, 31 parallel to a beam 28, 29 is provided on the opposite sides. A primary part 24 of the first linear motor 18 is fixed to a stationary holder 32. The secondary part 25 of this linear motor 18 is mounted on one side of the cross 23. A secondary part 27 of the other linear motor 19 is mounted on the other side of the cross 23. The primary part 26 of the second linear motor 19 is movable relative to this secondary part 27 and connected to the transverse sealing device 10 in order to open and close it. On the primary parts 24, 26, which are not attached to the cross 23, four carriages 33 for moving the primary parts 24, 26 along the guides 30, 31 are provided in each case.

The secondary parts 25, 27 are glued to the cross 23 in order to stabilize it. The cross 23 and the guides 30, 31 may be made of a single piece of aluminum for thermal expansion reasons, with a separate, hardened guide surface, each guide 30, 31 consisting of two mutually parallel rails 34, 35. Alternatively, rails 34, 35 of hardened steel may be used. The cross 23 points to the opposite

Pages each have a material recess 36 with a limiting edge 37 on this. The secondary parts 25, 27 extend over the beams 28, 29 and are in each case glued between two rails in a material recess 36.

While the primary part 24 of the first linear motor 18 moves the cross 23 and with this the transverse sealing device 10 up and down, the second linear motor 19 opens and closes the transverse sealing device 10 by a reciprocating movement of its primary part 26 relative to its secondary part 27 and thus to the cross The secondary parts 25, 27 are hardly heated in contrast to the primary parts 24, 26, so that the cross 23 does not increase the accuracy of the movement of the sealing jaws 11, 12 undergoes longitudinal expansion as a result of excessive heating.

In the exemplary embodiment of FIGS. 7 to 12, the two secondary parts 25, 27 of the cross 23 consist of a series of separate secondary part segments 40 arranged on one another. The secondary part segments 40 are each connected to the cross 23 by means of a fastening 41. As attachment 41 j eweils a screw is used. Each secondary segment 40 is connected to the cross 23 via a bottom part of a housing 42. The floor parts, and thus the housing 42, are at room temperature, d. H. in not yet operated linear motors 18, 19 close to each other (Figure 10). The material of the housing 42 together with respective bottom part is steel. This has a lower coefficient of linear expansion than the material of the cross 23, which is aluminum. Thus, until a respective operating temperature of the linear motors 18, 19 is reached by heat release of the magnets 44, the cross 23 expands more to form gaps 43 than the secondary parts 25, 27 (FIGS. 11 and 12). As a result, the cross 23 equipped with the secondary parts 25, 27 does not warp, so that the guides 30, 31 remain exactly aligned and the service life of the drive is significantly increased. As a result, the sealing jaws 1 1, 12 are moved exactly and in each case similar transverse seams 13 are produced on the film tube 6. The statements made in the first exemplary embodiment (FIGS. 1 to 6) apply correspondingly to the exemplary embodiment of FIGS. 7 to 12.

The term secondary segment 40 is to be understood as meaning a plurality of magnets 40 in one unit or in each case a single magnet 44. For assembly reasons, it is advantageous not to connect the magnets 44 individually with the cross 23, but each screw a group of magnets 44 with the cross 23 or glue. A single-screw connection for a group that is bounded laterally, two screws side by side or one single narrow adhesive trace transverse to the longitudinal extent of the secondary part 25, 27 is advantageous. This allows a free expansion of the secondary part segment 40 without the cross 23 being curved thereby.

Claims

claims

1. vertical tubular bag machine (1) with a of a supply roll (2) by means of a trigger (3) withdrawn film web (4), a forming shoulder (5) for forming the film web (4) to a film tube (6), a format tube (7 ) for receiving and filling the film tube (6), a longitudinal sealing device (8) for welding the longitudinal edges of the film web (4) and for producing a longitudinal seam (9) of the film tube (6), a transverse sealing device (10) with two mutually movable sealing jaws ( 1 1, 12) for producing transverse seams (13) on the film tube (6), a separating device (14) for separating the generated tubular bag (15) from the film tube (6), a mechanism (16) for holding the sealing jaws (1 1, 12), and a drive (17) for moving the transverse sealing device (10), wherein the drive (17) comprises two linear motors (18, 19), of which the first linear motor (18) for a movement of the transverse sealing device (10) in a first direction, in front Preferably, the vertical (20) is provided, and the second linear motor (19) for exerting a movement in a second direction, preferably the horizontal (21) is used to move a sealing jaw (1 1) in this direction, preferably both sealing jaws ( 1 1, 12) via a gear (22) to cause an opposite movement, wherein the linear motors (1 8, 19) are connected to each other via a connection, and j each linear motor (18, 19) of a primary part (24, 26 ) and a secondary part (25, 27), characterized in that the connection is a cross (23), the two bars (28, 29) extending transversely to each other, that on the opposite sides of the cross (23) in each case a part (24, 25, 26, 27) of another linear motor (18, 19) on another beam (28, 29) is fixed, that on the opposite sides in each case a guide (30, 31) parallel to a Beam (28, 29) is provided, that a part (24, 25, 26, 27) of a linear motor (18, 19) on a stationary support (32) is fixed, and its other part (24, 25, 26, 27 ) is fixed on one side of the cross (23), that a part (24, 25, 26, 27) of the other linear motor (18, 19) on the other side of the cross (23) is fixed, and its other Part (24, 25, 26, 27) relative to this part (24, 25, 26, 27) is movable and connected to the transverse sealing device (10), and that on the parts (24, 25, 26, 27), not fixed to the cross (23), at least one carriage (33) for moving the part (24, 25, 26, 27) along one

Guide (30, 3 1) is provided.

2. tubular bag machine according to claim 1, marked thereby, that in each case the secondary parts (25, 27) of the linear motors (18,

19) are fixedly connected to the cross (23).

3. tubular bag machine according to claim 1 or claim 2, characterized in that the guides (30, 31) on the cross (23) are fixed, wherein preferably the guides (30, 31) have a hardened surface.

4. tubular bag machine according to one of claims 1 to 3, characterized in that as a guide (30, 31) two mutually parallel rails (34, 35) are provided.

5. Tubular bag machine according to claim 4, characterized in that on each along a guide (30, 31) movable part (24, 25, 26, 27) four carriages (33) are provided, wherein in each case two carriages (33) along a common Rail (34, 35) are guided.

6. tubular bag machine according to one of claims 1 to 5, characterized in that the fixed to the cross (23) connected parts (24, 25, 26, 27) are glued to the cross (23).

7. tubular bag machine according to one of claims 1 to 6, characterized in that the cross (23) on the opposite sides in each case a material recess (36) having a limiting edge (37).

8. tubular bag machine according to claim 7, characterized in that the fixed to the cross (23) connected parts (24, 25, 26, 27) are each provided in a material recess (36).

9. A tubular bag machine according to claim 4 and claim 8, characterized in that the fixed to the cross (23) connected parts (24, 25, 26, 27) along the j eweiligen beam (28, 29) extend and between the rails ( 34, 35).

10. tubular bag machine according to one of claims 1 to 9, characterized in that the cross (23) made of a light metal, in particular aluminum or magnesium.

1 1. A tubular bag machine according to one of claims 1 to 10, characterized in that at least one secondary part (25, 27) consists of a series of juxtaposed, separate secondary part segments (40), wherein the secondary part segments (40) in each case by means of a fastening (41 ) are connected to the cross (23).

12. tubular bag machine according to claim 1 1, characterized in that each secondary segment (40) via a bottom part or a housing (42) with the cross (42) is connected.

13. tubular bag machine according to claim 12, characterized in that the bottom parts or the housing (42) at room temperature tight or with the formation of a gap (43) abut each other, and that the material of the bottom parts or the housing (42) has a lower coefficient of linear expansion as the material of the cross (23).

14. tubular bag machine according to claim 13, characterized in that as the material of the bottom parts or the housing (42) steel and as a material of the cross (23) aluminum is provided.

15. tubular bag machine according to claim 1 1 or claim 12, characterized in that the bottom parts or the housing (42) at room temperature in each case with the formation of a gap (43) abut each other.