EP2353408A2 - Transport drum for the tobacco processing industry - Google Patents

Abstract

The spool (10) has a rotatable drum body (12) including a retaining cavity (14) for transporting rod-shaped articles e.g. cigarettes (16), tobacco sticks and/or filter rods, of a tobacco processing industry. The body is formed with radial suction air holes (18) by a pressure source (30) based on the cavity. A control flange (20) is surrounded by the body and sectionally-formed in a circumferential direction. An airflow cross section is narrowed in a region between inner ends of the holes of the body by an inner end of the flange by pressure.

Description

The invention relates to a conveyor drum of the tobacco processing industry with a rotatable drum body, wherein the drum body receiving troughs for transporting or transported rod-shaped articles of the tobacco industry, especially tobacco sticks and / or filter rods or their components, wherein the drum body into the receiving troughs, Preferably, radial, Saugluftbohrungen has, so that the Saugluftbohrungen one or more receiving wells are acted upon by means of a vacuum source with negative pressure, and arranged with a arranged inside the conveyor drum, preferably stationary, control flange, which is surrounded by the drum body.

In machines of the tobacco processing industry, in particular filter attachment machines, conveyor drums are used to transport cigarettes, filter pieces or their components. By the term "components" of the cigarettes and filter rods For the purposes of the invention, sections of paper and the like are also understood to be made of flat and / or sheet material, for example sections and / or webs of cigarette paper, filter paper or tipping paper for joining tobacco pieces with filter plugs.

The conveyance of the aforementioned objects during the manufacture of cigarettes, filters and filter cigarettes is performed in modern production machines of the tobacco processing industry generally by means of conveyor drums, the lateral surface or the drum body for Queraxialen conveyance of rod-shaped objects (cigarettes, filter rods or filter plugs, filter cigarettes) Provide grooves for receiving the objects or for conveying sheet-like and / or sheet-like objects (tipping paper sections and / or webs) is substantially smooth.

During the promotion, these objects of the tobacco processing industry are held by suction on the conveyor drums, which abuts on corresponding channels, usually Saugluftbohrungen. These channels are generally arranged in rows transaxially one behind the other, whose lengths correspond to the dimensions of the objects to be transported transversely to the transport direction.

In filter-tying machines, bar-shaped articles, such as e.g. Tobacco sticks or filter plug or filter rods, transversely promoted in receiving troughs of the conveyor drum. Here, the receiving troughs are arranged at predetermined pitches on the peripheral surface of the conveyor drum.

In addition, for example, off GB-A-2 090 572 a conveyor drum known to the tobacco processing industry.

Based on this prior art, the object of the invention is to reduce the need for or the consumption of vacuum on a machine of the tobacco processing industry, while ensuring that the processing on the machine of the tobacco industry to be transported rod-shaped Articles are kept safe during transport, and it should also be possible, if necessary, to reduce the noise on a machine of the tobacco processing industry.

This object is achieved by a conveyor drum of the tobacco-processing industry with a rotatable drum body, the drum body receiving troughs for transporting rod-shaped articles of the tobacco industry, especially tobacco rods and / or filter rods or their components, wherein the drum body in the receiving troughs, Preferably radial, Saugluftbohrungen has, so that the Saugluftbohrungen one or more receiving wells are acted upon by means of a vacuum source with negative pressure, and arranged with an inside the conveyor drum, preferably stationary, control flange, which is surrounded by the drum body, which is further developed in that the control flange is formed in sections in the circumferential direction such that the air flow cross section in the region or in the transition region between the inwardly facing ends of the Saugluftbohrungen the drum body and the beauf under vacuum Haged or acted upon interior of the control flange is narrowed.

The invention is based on the idea that by a narrowing of the air flow cross section at the transition between the Saugluftbohrungen or the drum bores to the control flange of the cross section of Saugluftbohrungen is partially covered by the control flange, whereby the air flow cross section and the supply cross section is reduced to the receiving wells, whereby the need for vacuum or consumption of vacuum is significantly reduced.

The inner region, which is acted upon with negative pressure or with a vacuum in the interior of the control flange, remains at full negative pressure, wherein the constriction of the air flow cross section or the cover of the inwardly pointing ends of the suction air bores of the drum body is designed such that, in the case of a receiving trough occupied by a rod-shaped article ie that the rod-shaped article is arranged in a receiving trough, sufficient holding air or suction air for maintaining the holding force in the receiving trough during transport is kept under rotation of the drum body, whereby the rod-shaped article, e.g. Cigarette being held in the receiving trough.

Here, especially in the transfer area and receiving area of the rod-shaped article on the conveyor drum, the air flow cross sections in the area between the control flange and the Saugluftbohrungen larger to receive the promoted rod-shaped article with a larger holding force in the receiving wells and to hold themselves shortly after the transfer. In the subsequent transport area over the peripheral surface of the conveyor drum or the control flange, a lower holding force is exerted on the conveyed rod-shaped article during transport through the narrowing of the air flow cross section at the Saugluftbohrungen.

In a conveyor drum according to the invention the tobacco processing Industry for transporting cigarettes, filter sticks or their components are provided on the circumference of the conveyor drum in rows transversely axially behind one another and subjected to negative pressure, preferably radial Saugluftbohrungen, preferably each receiving trough having a plurality of Saugluftbohrungen, which are arranged in the longitudinal axial direction side by side. In addition, the Saugluftbohrungen several receiving troughs are arranged in a transverse direction of the conveyor drum in each case in a row one behind the other. The negative pressure which is provided in the interior of the conveyor drum is preferably provided by means of a control flange provided in the interior of the conveyor drum between a transfer area or receiving area in the conveyor drum up to a discharge area at the suction air holes of the conveyor drum or switched accordingly.

In addition, according to an alternative solution or according to a development of the conveyor drum provided that the control flange in the circumferential direction sections at least one or more, the Saugluftbohrungen the drum body associated Saugluftschlitze, so that in particular a Saugluftschlitz the control flange with Saugluftbohrungen the drum body, in the circumferential direction of the Drum body are arranged in a row transverse axial succession, communicate.

The fact that in the transport region of the rod-shaped article on the conveyor drum by means of a narrowing the air flow cross section Saugluftschlitzes the negative pressure at the receiving troughs compared to the receiving area for the rod-shaped article on the conveyor drum while maintaining a sufficient holding force for the transported and recorded rod-shaped Article is provided, the vacuum on the machine is significantly reduced, while it is also possible to reduce by a smaller dimensioning of the vacuum supply and the noise on the machine.

In addition, there is a further advantage of the invention is that at a non-occupancy of the receiving troughs of the conveyor drum, a lower vacuum loss in the transport area arises because the air flow due to the narrowing of the air flow cross-section or due to the narrowing through the Saugluftschlitz in the control not to the value at a Uncirculated Saugluftbohrung can increase.

Moreover, in one embodiment of the conveyor drum is provided that the control flange one or more, in the axial direction of the conveyor drum widened (n), Saugluftbereich and / or Saugluftbereiche, wherein the or the Saugluftschlitze the control flange open into or in the widened Saugluftbereiche. In particular, the suction air areas widened in the axial direction of the conveyor drum are formed in the receiving area of the conveyor drum on the control flange in order to securely receive the rod-shaped articles transferred to the conveyor drum or into the receiving cavities. Subsequently, in the conveying direction of the drum body or the conveyor drum, the receiving troughs are securely held in the transport region of the conveyor drum by means of a vacuum reduced by the suction air slots of the control flange in comparison to the receiving area of the conveyor drum.

In addition, a further embodiment of the conveyor drum is characterized in that the width of a Saugluftschlitzes is smaller than the diameter of the Saugluftschlitz respectively assigned in a series of transverse axial successively arranged Saugluftbohrungen the drum body.

Preferably, furthermore, the width of the suction air area of the control flange widened in the axial direction of the conveyor drum is greater than the diameter of the suction air bores of the drum body of the conveyor drum, preferably arranged in the axial and / or transverse axial direction of the conveyor drum.

For this purpose, it is provided in a preferred embodiment that the widened or suction air areas of the control flange are formed in the transfer area or in the receiving area of the conveyor drum for male rod-shaped article.

Moreover, preferably in the conveyor drum in a development or the widened Saugluftbereiche the control flange, preferably in the transfer area or in the receiving area of the conveyor drum for male rod-shaped article over several, preferably all, suction holes of a receiving trough or the receiving troughs throughout, ie. uninterrupted or uninterrupted in the longitudinal axial direction, widened formed so that in the longitudinal axial direction of a receiving trough several or all Saugluftbohrungen the receiving trough in the region of or continuously widened Saugluftbereiche are acted upon at the same time with negative pressure or are.

Advantageously, the one or more suction air slots of the control flange narrowing the air flow cross section are formed in the transport region of the rod-shaped articles on the conveyor drum.

According to a preferred embodiment it is further provided that the width of the inwardly facing ends of the Suction holes narrowed air flow cross section is adjustable.

Furthermore, a development of the conveyor drum is characterized in that the air flow cross section with respect to the circumferential direction of the conveyor drum or on the circumferential direction of the control flange in cross section, preferably continuously changed.

In addition, the object is achieved by a machine of the tobacco-processing industry, in particular filter attachment machine, which is formed with a conveying drum according to the invention described above. To avoid repetition, reference is expressly made to the above statements.

Further features of the invention will become apparent from the description of embodiments according to the invention together with the claims and the accompanying drawings. Embodiments of the invention may satisfy individual features or a combination of several features.

Fig. 1

schematisch eine Ansicht einer erfindungsgemäßen Fördertrommel der Tabak verarbeitenden Industrie;

Fig. 2a

eine schematische, perspektivische Ansicht einer erfindungsgemäßen Fördertrommel,

Fig. 2b

eine perspektivische Ansicht einer erfindungsgemäßen Fördertrommel in einer schematisierten Detailansicht;

Fig. 3a bis 3e

schematisch im Querschnitt jeweils eine Ausgestaltung des Übergangsbereichs zwischen einem Steuerflansch und einem Trommelkörper einer Fördertrommel.

The invention will be described below without limiting the general inventive idea by means of embodiments with reference to the drawings, reference being expressly made to the drawings with respect to all in the text unspecified details of the invention. Show it:

Fig. 1

schematically a view of a conveyor drum of the tobacco processing industry according to the invention;

Fig. 2a

a schematic, perspective view of a conveyor drum according to the invention,

Fig. 2b

a perspective view of a conveyor drum according to the invention in a schematic detailed view;

Fig. 3a to 3e

schematically in cross section in each case an embodiment of the transition region between a control flange and a drum body of a conveyor drum.

In the following figures, identical or similar elements or corresponding parts are provided with the same reference numerals, so that a corresponding renewed idea is dispensed with.

In Fig. 1 schematically is a view of a conveyor drum 10 of a schematically designated machine of the tobacco-processing industry M shown. For example, a machine designed as a filter attachment machine has a plurality of conveyor drums. For example, under the name MAX, a filter attachment machine from HAUNI Maschinenbau AG is known.

The conveyor drum 10 has a rotatable or rotationally driven outer drum body 12, for reasons of clarity and representability in Fig. 1 shown in cross section. The drum body 12 has over its circumference on receiving wells 14, in which rod-shaped articles, such as cigarettes or filter rods or components thereof, are transported transaxially.

In Fig. 1 a receiving trough 14 is shown in cross section, in which a cigarette 16 is arranged as a rod-shaped article. The drum body 14 also has radial suction air holes 18, which open on the outside of the drum body 12 in the recessed surface of the receiving wells 14 and in the sink of the receiving wells 14. The diameter of the Saugluftbohrungen 18 is in conveyor drums of the tobacco processing industry typically between 2.5 mm to 5 mm.

Inside the conveyor drum 10, a stationary control flange 20 is arranged, which is surrounded by the drum body 12. The control flange 20 is substantially pot-shaped or cylinder-jacket-like and connected to a vacuum source 30, shown schematically, to supply the Saugluftbohrungen 18 of the drum body 12 with negative pressure or to apply.

The control flange 20 has on the peripheral surface in the region of the transfer of rod-shaped articles over a plurality, preferably all, suction holes 18 of a receiving recess 14 continuous, widened passage portion 22, so that the sucked air passages 18 conveyed past the passage area 22 are subjected to negative pressure, whereby the given cigarettes 16 are placed securely after the transfer into the receiving troughs 14. After the transfer and receiving the filter cigarettes 16 in the receiving troughs 16, the occupied receiving troughs 16 are further promoted by the rotation of the drum body 12, wherein the Saugluftbohrungen 18 continue to be subjected to negative pressure.

The control flange 20 has in the connection, based on the conveying direction of the filter cigarettes or the direction of rotation of the drum body 12 in the suction air holes 18 parallel next to each other arranged Saugluftschlitze 24 to pressurize the Saugluftbohrungen 18 after passing the Saugluftbohrungen 18 at the passage region 22 with negative pressure. The passage area 22 is widened in the axial direction of the conveyor drum 10. The Saugluftschlitze 24 open or begin at the passage area 22 and are formed in the circumferential direction or in the conveying direction of the drum body 12 in a predetermined section over the circumference of the control flange 20 in the suction air holes 18.

In this case, the width of the Saugluftschlitze 24 is smaller than the width or the diameter of Saugluftbohrungen 18. In the subsequent to the passage portion 22 transport area or transport section, the Saugluftschlitze 24 are formed, wherein the width of Saugluftschlitze 24 is dimensioned so that a sufficient holding force is formed in the suction holes 18 for holding the transported or to be transported filter cigarettes 16. Typically, the width of the suction air slots 24 is between 0.5 mm to 2.0 mm.

In the upper area of the Fig. 1 is a section of a top view of the conveyor drum 10 and on a receiving trough 16 is shown above the filter cigarette 16, which is acted upon by the Saugluftschlitz 24 with suction air surface 26 is smaller than the round cross-sectional area of the Saugluftbohrung 18th

In the FIGS. 2a and 2 B are perspective views of the conveyor drum 10 is shown, for reasons of representability and clarity of the drum body 12 is shown broken. From the FIGS. 2a and 2 B It can be seen that the Saugluftschlitze 24 each have a number of successively arranged transaxially Saugluftbohrungen 18 of distributed over the circumference receiving troughs 14 is assigned, so that by applying a negative pressure in the control flange 20 with respect to the passage area 22 reduced vacuum applied to the Saugluftbohrungen 18.

In the FIGS. 3a to 3e Various embodiments of the transition region between the control flange 20 in the interior and the Saugluftbohrungen 18 of the drum body 12 are shown. In Fig. 3a is covered by a one-sided cover of the inwardly facing end of Saugluftbohrung 18 by means of the control flange 20, whereby the air flow cross-section is narrowed from the interior of the control flange 20 to the continuous suction air hole 18.

According to Fig. 3b the control flange 20 is formed in the transition region to the Saugluftbohrung 18 with a chamfer 28, wherein the control flange 20 by a cover of the inner end of the Saugluftbohrung also narrows the air flow cross-section, whereby the suction effect is reduced by the applied or provided negative pressure in the Saugluftbohrung 18.

In Fig. 3c is schematically the adjustability of the control flange 20 (see. Fig. 3a ), whereby the area covered by the control flange 20 at the inner end of the suction air hole 18 is adjusted accordingly.

In Fig. 3d schematically a wedge-shaped body of the control flange 20 is shown, whereby also the air flow cross section at the inner end of the suction air bore 18 is lowered or is.

In Fig. 3e a further embodiment of the transition region between the control flange 20 and the drum body 12 is shown, wherein the control flange 20 has movable bodies inside in the axial direction to narrow the air flow area at the inner end of the suction air hole 18 of the drum body 12 so that the bodies of the control flange 20 overlap the inner end of the suction air hole 18, whereby the suction air-exposed one Area is reduced or is.

All mentioned features, including the drawings alone to be taken as well as individual features that are disclosed in combination with other features are considered alone and in combination as essential to the invention. Embodiments of the invention may be accomplished by individual features or a combination of several features.

LIST OF REFERENCE NUMBERS

10

conveyor drum

12

drum body

14

receiving trough

16

Cigarette

18

Saugluftbohrung

20

control flange

22

Passband

24

Saugluftschlitze

26

Suction air applied surface

28

bevel

30

Vacuum source

M

Machine of the tobacco processing industry

Claims (11)

The drum (10) of the tobacco processing industry with a rotatable drum body (12), the drum body (12) receiving troughs (14) for transporting rod-shaped articles (16) of the tobacco processing industry, in particular tobacco rods and / or filter rods or their components , wherein the drum body (12) in the receiving wells (14), preferably radial, Saugluftbohrungen (18), so that the Saugluftbohrungen (18) of one or more receiving wells (14) by means of a vacuum source (30) are subjected to negative pressure, and with a control flange (20) arranged inside the conveyor drum (10) and preferably stationary, which is surrounded by the drum body (12), characterized in that the control flange (20) is formed in sections in the circumferential direction such that the air flow cross section in the area between the inwardly facing ends of the Saugluftbohrungen (18) of the Drum body (12) and the acted upon or pressurized with negative pressure inside the control flange (20) is narrowed. Conveying drum (10) according to the preamble of claim 1 or claim 1, characterized in that the control flange (20) in sections at least one or more, the Saugluftbohrungen (18) of the drum body (12) associated Saugluftschlitze (24), so in that, in particular, a suction air slot (24) of the control flange (20) communicate with suction air bores (18) of the drum body (12) which are arranged in the circumferential direction of the drum body (12) in a row transversely in succession. Conveying drum (10) according to claim 1 or 2, characterized in that the control flange (20) has one or more, in the axial direction of the conveyor drum (10) widened (n), Saugluftbereich (22) or Saugluftbereiche (22), wherein the or the suction air slots (24) of the control flange (20) open into the widened suction air region (22) or into the widened suction air regions (22). Conveying drum (10) according to claim 2 or 3, characterized in that the width of a Saugluftschlitzes (24) is smaller than the diameter of the Saugluftschlitz (24) respectively associated in a row queraxial successively arranged Saugluftbohrungen (18) of the drum body (12). Conveying drum (10) according to claim 3 or 4, characterized in that the width of the axial direction of the conveyor drum (10) widened Saugluftbereichs (22) of the control flange (20) is greater than the diameter of, preferably in the axial and / or in the transverse axial direction of the conveyor drum (10) arranged Saugluftbohrungen (18) of the drum body (12) of the conveyor drum (10). Conveying drum (10) according to any one of claims 3 to 5, characterized in that the or the widened Saugluftbereiche (22) of the control flange (20) in the transfer region of the conveyor drum (10) are formed for male rod-shaped article (16). Conveying drum (10) according to one of claims 3 to 6, characterized in that the or the widened Saugluftbereiche (22) of the control flange (20), preferably in the transfer region of the conveyor drum (10) for male rod-shaped article (16), over several, preferably all, Saugluftbohrungen (18) of a receiving trough (14) or the receiving troughs (14) are formed widened throughout. Conveying drum (10) according to one of claims 2 to 7, characterized in that the suction air slot or slots (24) of the control flange (20) are formed in the transport region of the rod-shaped articles (16) on the conveyor drum (10). Conveying drum (10) according to one of claims 1 to 8, characterized in that the width of the constricted air flow cross section is adjustable. Conveying drum (10) according to one of claims 1 to 9, characterized in that the air flow cross section relative to the circumferential direction of the conveyor drum (10) on the Circumferential direction of the control flange (20) in cross section, preferably continuously changed. Machine (M) of the tobacco-processing industry, in particular a filter attachment machine, with a conveying drum (10) according to one of Claims 1 to 10.

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