EP3853133A1

EP3853133A1 - Synchronously adjustable tubular bag forming unit

Info

Publication number: EP3853133A1
Application number: EP19779414.2A
Authority: EP
Inventors: Tobias Nitsche
Original assignee: Formerfab GmbH
Current assignee: Formerfab GmbH
Priority date: 2018-09-21
Filing date: 2019-09-23
Publication date: 2021-07-28
Also published as: WO2020058532A4; WO2020058532A1

Abstract

The invention relates to a forming unit for forming a tube from a material web, comprising: a base frame (2); two forming elements (3) arranged next to one another on the base frame (2), mounted such that they move obliquely to the transport direction of the material web (1), and each comprising a segment of the forming edge (12), and a seam former (22), arranged in the region of the web run-out cross-section (13), for forming a longitudinal seam in the material web (1); and an adjustment unit which acts synchronously on both forming elements (3) to change the cross-section of the tube to be created.

Description

Synchronous adjustable tubular bag forming device

The invention relates to a

Tubular bag forming device for forming a

Hose from a material web, for forming, filling and sealing machines, with an adjustment device.

Generic shaping devices for forming a

A wide variety of hoses made from a material web are known. These shaping devices are in

Packaging machines, which are also known as tubular bag machines or forming, filling and sealing machines, are used to form a flat, flexible material web into a tube. Depending on the direction of the

Material web in the forming process differentiates between vertical and horizontal tubular bag machines.

Vertical tubular bag machines are preferred for

Packing of bulk goods used in tubular bags, whereas horizontal tubular bag machines are used in particular for packing general cargo. The forming of the material web from the flat to the tubular state takes place within the tubular bag machine on a forming device. Some shaping devices have a shoulder part on which the flat cross section of the

Material web is first curved, and a prism part, on which the curved cross section is formed into a closed tube cross section. This type of

Forming devices are called form shoulders.

In addition to the crease-free forming, ie guiding the material web so that folds and tears in the material has been found to be a main problem of such shape shoulders that a separate shape shoulder is required for each hose cross section to be produced.

In addition to the high costs associated with keeping multiple

Shaped shoulders for one and the same tubular bag machine is disadvantageous with this solution that longer downtimes are inevitable when changing the format in order to replace the shaped shoulder, realigning deflection rollers for the material web, etc.

An object of the invention is to improve

Specifying shaping devices for tubular bag machines, which are adjustable in a manner that an adaptation to changing in a relatively simple manner

Hose cross sections can be made without the

To have to replace the forming device as a whole.

To solve this problem, a shaping device for forming a hose from a material web is proposed with a first forming area in which the material web is guided from a web inlet straight line to a forming edge and is thereby formed from a flat to a curved state, and one downstream of the first Forming area adjoining second forming area, in which the material web is guided from the forming edge to a web outlet cross-section and is thereby deformed from the curved to a tubular state, which comprises the following: a base frame, two on the base frame

Forming elements arranged next to one another and slanted relative to the transport direction of the material web, each with a segment of the forming edge, and a seam former for forming, arranged in the region of the web outlet cross section a longitudinal seam in the material web, and a

Adjustment device that acts synchronously on both shaping elements to change the hose cross section to be produced.

With the proposed shaping device, it is possible for the first time to change the format of the one to be produced

Hose cross section quick, reproducible and

automated. The adjusting device can comprise, for example, one or more servo motors which act on the shaping elements in order to close them

adjust that the hose cross-section is increased or decreased in width and / or in its height.

In order to make the height of the hose cross-section to be adjustable as well as the width, one is required

Design of the shaping device provided that the shaping elements each comprise a first partial element and a second partial element, the second partial element abutting the first partial element in a minimum position and the second partial element forming a gap in the forming edge that increases with increasing distance from the first partial element is adjustable to a maximum position, and the adjustment device for changing the

Hose cross section to be produced also acts synchronously on both second sub-elements.

In a further development of the invention it is provided that the adjusting device for each shaping element comprises an elastic traction means, one end of which is connected to a front end of a shaping element and the other end of which is connected to a rear end of a

Forming element is connected. That way they can Forming elements on the base plate so back and forth

be moved that the width of the tube cross section to be produced is changed, the two

Shaping elements are moved back and forth along an adjustment path that runs obliquely to the transport direction of the packages. It is still advantageous

provided that the traction means is guided by an arrangement of deflection rollers so that the traction means even when the traction means moves the

Forming element always remains taut. Alternatively, the adjustment device for each shaping element

naturally also include another adjustment mechanism, which is designed, for example, as a lever mechanism, linkage or the like.

It can advantageously be provided that the

Shaping elements are arranged on a slide plate, which is displaceable on the base plate in the horizontal plane. In this way, all elements of the

Molding device that move in the same way as the molding elements themselves, with these on the

Sliding plate can be summarized.

To ensure that the packages are exactly through the forming area of the

To be able to guide the shaping device, it can further be provided that, seen in the transport direction, a side guide for laterally guiding the packages is arranged in front of and behind each shaping element

Transport path of the package-extending adjustment path is shifted with. This particularly advantageous embodiment enables extensive automation of the

Format adjustment in the proposed Shaping device.

In embodiments of the proposed shaping device in which the shaping elements are realized by means of a traction means such as a toothed belt or the like, the side guides can advantageously be formed at least partially by the ends of the traction means. For example, on the respective slide plate in front of and behind the

Forming element, a fastener for the traction means can be attached, to which the respective end of the

Traction means is attached so that the front and rear section of the traction means, insofar as these run parallel to the transport path of the packages, simultaneously serve as length-adjustable side guides for the packages.

Alternatively or additionally, it can be provided that the side guides each overlap two

Include side guide elements, the overlap of which is changed when the shaping element is displaced, so that the total length of the side guide elements is increased or decreased. This extends the

Side guides, regardless of the current position of the shaping elements, always from the front edge of the base plate to the entry into the forming area, i.e. the front end of the shaping element, as well as from the outlet from the

Forming area, i.e. the rear end of the shaping element, to the rear edge of the base plate.

Side guide elements can, as already described above, through the front and rear end of a

Traction means are formed, the associated overlapping side guide element, for example by a lateral Housing wall one movable with the molding element

Housing can be formed.

Alternatively, they can overlap each other

Lateral guide elements, for example by a side housing wall of a movable with the forming element

Housing and a side housing wall of an additional housing movable only transversely but not longitudinally to the transport direction of the packages.

The invention is described below with reference to two

Exemplary embodiments and associated drawings explained in more detail. Show

Fig. 1 shows a basic structure of an adjustable

Shaping device,

2 to 5 a first embodiment of the

shaping device according to the invention, and

6 and 7 a second embodiment of the

shaping device according to the invention.

In Fig. 1 is a patent pending at the same time

Shaping device shown in which the

Hose cross section is adjustable in two dimensions, so that both the width and the depth of the

Tubular cross-section can be varied.

A plate-shaped base frame 2 forms the basis of the device, on which packages 4 are moved in a transport direction, while a material web 1 passes through

Shaping elements 3 from a flat state into one

tubular state is transferred, which encloses the packages 4. The base frame 2 has slots 21 which serve to bring the side edges of the material web with progressive deformation under the base frame 2, where these side edges are placed one above the other by a seam former 22 arranged on the underside of the base frame 2, so that a fin seam is formed, which then (by a here not shown

Welding device) can be welded, which completes the formation of a packaging tube.

The shaping elements are designed symmetrically to one another in a manner similar to known devices and by means of an adjustment guide element 33, which is slot-shaped (not shown here)

Adjustment path of the base frame 2 at an angle to

The direction of transport of the packages 4 and the material web 1 is displaceable and can be locked at any position, the adjustment tracks being V-shaped and the seam former 22 being arranged at the apex of the V-shaped arrangement of the adjustment tracks.

The two shaping elements 3 each enter

Forming edge segment, i.e. the forming edge 12 is not formed in one piece. Due to the proposed further subdivision of the shaping elements 3 into a first partial element 31 and a second partial element 32, which is carried by the first partial element 31, the forming edge segments 12 are also divided again, i.e. each of the two shaping elements 3 contains two subsegments of the shaping edge 12.

The V-shaped adjustability of the two shaping elements 3 relative to the base frame 2 enables the width of the web outlet cross section 13 to be increased, as in the case of known devices vary .

In addition, due to the further subdivision of the shaping elements 3 into a first partial element 31 and a second partial element 32, the proposed device makes it possible to vary the height of the web outlet cross section 13.

In the exemplary embodiment, the second sub-element 32 is held on the first sub-element 31 by a telescopic rod 34, which enables the second sub-element to be steplessly adjusted, namely between a minimum position in which the second sub-element 32 touches the first sub-element 31, so that the two sub-segments the forming edge 12

abut, and a maximum position in which there is a gap between the two sub-segments of the forming edge 12.

If the second sub-element 32 is moved away from the minimum position, there is an increasing gap between the first sub-element 31 and the second sub-element 32 and thus also between the two sub-segments of the forming edge 12. However, this gap is closed by the

Bridging element 35, which is a flexible stainless steel wire in the exemplary embodiment, which is attached to the second partial element 32 and is pulled with the movement of the second partial element 32 away from the first partial element 31 from a guide that the first partial element 31 for

Bridging element 35 and in which the

Bridging element at any point by means of a locking element 36, which is realized in the exemplary embodiment by a screw.

2 to 5 show improvements to a first embodiment of this shaping device on the one hand, allow the shaping elements 3 to be adjusted synchronously and, on the other hand, thus make the setting possible to be automated. 2 and 3 show a first set-up state of the molding device in two

4 and 5 show a second set-up state of the molding device in two different views.

For this purpose, the shaping device has an adjusting device which has an elastic one for each shaping element 3

Traction means 51, for example a toothed belt or

the like, one end of which is connected to a front end of a shaping element 3 and the other end of which is connected to a rear end of a shaping element 3. The traction means is driven by a drive roller 52, which in turn does not have one here

shown drive device such as a servo motor or the like is driven. The traction means 51 is guided through an arrangement of deflection rollers 53 such that the traction means 51 also through the traction means 51

caused movement of the shaping element 3 always remains taut. Some deflection rollers 53 are arranged on the base plate 2 so that they are perpendicular to

Can move the transport direction of the material web, but not in the transport direction. The shaping elements 3 and some other deflection rollers 53 are each arranged on a sliding plate 54, which is on the base plate 2 in the

Horizontal plane, the oblique to the transport direction of the

Material path extending adjustment path of the shaping elements 3, is displaceable, which also means that on the

Slide plate 54 arranged pulleys with the

Shaping elements 3 are moved when the Forming device is reset.

The two drive rollers 52 can, for example, either with a common or with their own

Drive device to be connected, or one of the two drive rollers 52 is on the one hand with a

Drive device and on the other hand with the other

Drive roller 52 connected, for example by gears or a belt drive, for example on the

Bottom of the base frame 2 is arranged.

The front and rear ends of the two traction means 51 form side guides 23 for the packages 4 on their way through the forming area of the shaping device, in which the packages 4 are enclosed by the tube cross section that is formed.

The front end of the traction mechanism 51 is fastened to the sliding plate 54 in the immediate vicinity of the front end of the shaping element 3. From this fastening point to the first deflection roller 53 (which can only be moved transversely to the transport direction) on the front edge of the base plate 2, the traction means 51 forms a front side guide 23 for the packages 4. If the shaping element (at an angle to the transport direction)

adjusted, the length of the front changes

Side guide 23 and at the same time it moves with the first guide roller 53 transversely to the transport direction. Together, the change in length and the transverse movement of the

Side guide 23 that it always has the required length and is in the correct position.

The rear end of the traction means 51 is in the immediate vicinity of the rear end of the shaping element 3 on the sliding plate 54 attached. From the last deflection roller 53 (only movable transversely to the transport direction) on the rear edge of the base plate 2 up to this fastening point, the traction means 51 forms a rear side guide 23 for the

Packages 4. If the shaping element (at an angle to

Transport direction) adjusted, the length of the rear side guide 23 changes and at the same time it moves with the last deflecting roller 53 transversely to the transport direction. Together, the change in length and the transverse movement of the side guide 23 ensure that it always has the required length and is in the correct position.

6 and 7 show improvements to a second exemplary embodiment of the proposed shaping device, which largely corresponds to the first exemplary embodiment

matches. The main differences are in the side guides 23.

In the exemplary embodiment shown here, the

Side guides 23 two overlapping each

Side guide elements 23a, 23b, the overlap of which is changed when the shaping element 3, 31, 32, 33 is displaced, so that the total length of the side guide 23

is enlarged or reduced. As a result, the side guides 23 always extend regardless of the current position of the shaping elements 3, 31, 32, 33 from the front edge of the base plate 2 to the entry into the forming area, i.e. the front end of the forming element 3, 31, 32, 33, as well as from the outlet from the forming area, i.e. the rear end of the shaping element 3, 31, 32, 33, to the rear edge of the base plate 2.

The overlapping side guide elements 23a, 23b are formed by lateral housing walls of a housing 61 which is movable with the shaping element 3, 31, 32, 33 and an additional housing 62 which is movable only transversely but not longitudinally to the transport direction of the packages 4.

Synchronous adjustable tubular bag forming device

Reference sign

1 web of material

11 straight web

12 forming edge

13 web exit cross-section

2 base frame

21 slot

22 seam formers

23 side guide

23a, 23b side guide element

3 shaping element

31 first sub-element

32 second sub-element

33 adjustment guide element

34 telescopic rod

35 bridging element

36 locking element

4 packages

51 traction means

52 drive roller

53 pulley

54 sliding plate

61 housing

62 additional housing

Claims

Synchronous adjustable tubular bag forming device claims

1. forming device for forming a tube from a material web,

- With a first forming area in which the

Material web is guided from a web inlet straight line to a forming edge and is thereby formed from a flat to a curved state,

- A second forming area downstream of the first forming area, in which the material web extends from the forming edge to one

Web exit cross-section is guided and is thereby transformed from the curved into a tubular state, comprising

- a base frame (2),

- Two on the base frame (2) side by side

arranged, diagonally to the transport direction of the

Material web (1) movably mounted forming elements (3), each with a segment of the forming edge (12), and

- A seam former (22) arranged in the region of the web outlet cross section (13) to form a

Longitudinal seam in the material web (1), and

- An adjustment device to change the hose cross-section to be produced on both

Forming elements (3) acts synchronously.

2. Molding device according to claim 1, wherein

- The shaping elements (3) each have a first

Partial element (31) and a second partial element (32) comprise, wherein

- The second sub-element (32) in a minimum position abuts the first sub-element (31) and

- The second sub-element (32) is adjustable up to a maximum position, forming a gap in the forming edge (12) that increases with increasing distance from the first sub-element (31), and

- The adjustment device for changing the

Hose cross section to be produced also acts synchronously on both second sub-elements (32).

3. Molding device according to claim 1 or 2, wherein the adjusting device for each shaping element 3 comprises an elastic traction means (51), one end of which is connected to a front end of a shaping element (3) and the other end of which is connected to a rear end of a shaping element (3) is connected.

4. Molding device according to one of claims 1 to 3, in which the traction means (51) is guided by an arrangement of deflecting rollers (53) such that the traction means (51) also at a through the traction means (51)

caused movement of the shaping element (3) always remains taut.

5. Molding device according to claim 1 or 2, wherein the adjusting device for each shaping element (3) comprises a lever mechanism or linkage.

6. Molding device according to one of claims 1 to 5, in which the shaping elements (3) each have one

Slide plate (54) are arranged on the

Base plate (2) is displaceable in the horizontal plane.

7. Molding device according to one of claims 1 to 6, in which, seen in the direction of transport, a side guide (23) for guiding the packages (4) laterally is arranged in front of and behind each shaping element (3), which guides the packages (4) when the shaping element (3) moves along the oblique to the transport path of the packages (4)

Adjustment path is shifted with.

8. Molding device according to claim 7, wherein the

Side guides (23) are at least partially formed by the ends of a traction means (51).

9. Molding device according to claim 7, wherein the

Side guides (23) two overlapping each

Side guide elements (23a, 23b) comprise, the

Overlap is changed when the shaping element (3) is shifted, so that the total length of the

Side guide elements (23a, 23b) is enlarged or reduced.

10. Molding device according to claim 9, wherein the

overlapping side guide elements (23a, 23b) through lateral housing walls of a housing (61) movable with the shaping element (3, 31, 32) and one only transversely but not longitudinally to the transport direction of the

Packages (4) movable additional housing (62) are formed.