DE102009022756A1 - Schneidtube - Google Patents

Abstract

The present invention relates to a cutting tube for a strand (11) of the tobacco-processing industry with an inlet side (8), an outlet side (9) arranged opposite the inlet side (8) and with a radial, alternating overlapping of the strand (11) and releasing the strand (11) open groove (10) and with a first passage gap (15) and with a second passage gap (16), which allows a low-maintenance operation and ensures an optical quality of cut, characterized in that the head end (20) of the second Passage gap (16) and / or the head end (18) of the first passage gap (15) has a in the direction of the outlet side (9) expanding passage cross-section.

Description

The The present invention relates to a cutting tube for a Strand of the tobacco processing industry with a fastening end and a free end opposite the attachment end and with a first end face, one of the first end face opposite lying second end face, a substantially transverse to the first end side and the second end side arranged inlet side, one opposite the entrance side arranged Exit side and with a strand over the strand at one end of the cutting tube for radial, alternating overlap and releasing the strand of open groove for guiding the strand during a cut, which extends from the first front page to to the second end side extending groove bottom and one of the Nutgrund outwardly extending, first groove wall and one opposite to the first groove wall and of has the groove bottom outwardly extending second groove wall, wherein the first groove wall on the outside of the outlet side is limited and provided with a first passage gap and the second groove wall on the outside of the inlet side is limited and provided with a second passage gap and the first passage gap and the second passage gap across are arranged to the longitudinal extension of the groove bottom.

such Cutting tubes are used to cut strands during manufacture from cigarettes and filters related to initially endless prepared fiber strands in sections useful for further processing to share needs-based length, which also in filter segments produced strands is the case.

there First, the respective material, such as tobacco fibers, Transfer filter fibers and / or filter segments to wrapping paper, along with wrapping paper preformed into a strand, in a border area of wrapping paper and then strand by an overlap of the wrapping paper in the area the applied glue track closed, with an average in the Essentially circular strand arises.

Around to ensure a safe closing of the strand a minimal amount of glue must be used, which in turn the further processing steps, such as cutting to to bring a rapid bonding is. Not always can be avoided that glue residues from the so-called seam or the gluey overlap area of the wrapping paper still leaves while closing the strand downstream cutting process bothers, especially at a Use hot glue or a higher amount on a watery glue and a particularly fast-running Strand.

It It can happen that glue is involved in cutting Device parts, such as knives or strand guides or .. Cutting tubes settles, resulting in a deteriorated cut quality sections leading to a production interruption can. In order to prevent this, manual cleaning operations are always necessary. which can only be done when the machine is at a standstill and thus restrict the machine availability.

When Cutting devices are under in the tobacco processing industry other rotating knife carrier with circumferentially distributed arranged cutting blades, which with a so-called, multi-armed Tubenrad act together.

The Tubenrad carries on cutting arms attached, continuously moving cutting tubes, which are in their cyclical orbit the strand in one Approaching the cycle, spreading it over, for lead the period of the knife passage and the strand after release the cut again, both in the single-strand, and in the Two strand method.

Working and mode of action of a cutting tube bearing, rotating Tubenrads are for example from the publications DE 21 38 834 . DE 23 45 063 . EP 1 905 316 A2 . EP 1 815 757 A1 such as WO 2005/089574 known.

A such Schneidtube is, as explained above, also inferior to growing glue residues.

task The present invention is to provide a cutting tube, which a low-maintenance operation and optimum cutting quality guaranteed.

These Task is by a Schneidtube with the features of the claim 1 solved.

On this way, a deposition and growth of glue residues effectively and effectively prevented at a cutting tube, at least the distance from one cleaning to the next cleaning significantly extended with consistently high cutting quality become.

With such a cutting tube can be over five times longer operating time - without interrupting cleaning operations - achieve. In the presently proposed embodiment of the cutting tube, a knife entering the cutting gap of the cutting tube can be securely guided even at high rotational speed and high cutting speed, and for continuous wear ning the cutting gap while the process is running or during production. This is made possible by the configuration of the cutting gap with passage gaps in the course of the entry of the knife in the direction of the outlet of the knife. While in a channel-like narrow portion of the cutting gap, the cyclically occurring and oscillating blade is precisely guided, the radially outer cutting edge when passing through the cutting gap or the passage gaps, the approximately conically widening trained cutting gap or the passage gaps continuously clean , Corresponding to the passage of the blade of the cutting gap is formed at its in the cutting tube inside the head end approximately conically widening to the exit side. In this case, it is particularly easy for the entering knife cutting edge to dissipate any glue residues adhering to inner surfaces of the cutting tube to the outside, since a discharge resistance in the region opening towards the exit side in width and / or height is markedly reduced in this area.

advantageous Embodiments and developments of the Schneidtube are the dependent claims, as well the description of an embodiment of a Schneidtube refer to.

Next a self-cleaning effect ensures the proposed Schneidtube by the special design of the cutting gap or the passage column a minimum contact surface for a Accumulation of glue residues and guaranteed nevertheless an optimal, low-friction knife guide. Independently from the self-cleaning effect described above and hereinafter has the proposed cutting tube according to a Embodiment of claim 10 and optionally in the claims 11 to 14 specified developments an embodiment, which preventively settling or attaching glue residues counteracts, by a minimized guide surface for an entering knife.

The in the cutting gap of the cutting tube opposite each other Guide surfaces are spaced such that when adjusting the cutting tube orientation for precise Operation intervention of a knife at standstill of the machine a game-afflicted Passage of the knife is possible and that in case of operation a frictionless passage with simultaneous Support function guaranteed at knife vibrations is.

Of the previously explained preventive effect by specifically Plateauartig configured guide surfaces in The cutting gap can also be independent of the above set explained self-cleaning effect, so that This aspect has its own inventive step. A cutting tube with this preventive effect does not have to be a provided according to claim 1 extending the Have passage cross section in the direction of the exit side, so that provided in claim 10 back to claims 1 to 9 in connection with a combination the two aforementioned effects is to be understood. Such a cutting tube solves the above-mentioned Task, without the aforementioned extension of the passage cross-section according to claim 1.

The The present invention will be described below with reference to one of FIGS illustrated embodiment of a cutting tube closer explained.

1 shows a schematic plan view of the exit side of the cutting tube.

2 shows a schematic plan view of the inlet side of the cutting tube 1 ,

3 shows a schematic section through the Schneidtube along the section line AA in 2 ,

4 shows a schematic, perspective sectional view of the cutting tube, in an enlarged view.

The in the 1 to 4 shown cutting tube is constructed substantially in much the same as a double fork and comprises two mutually transversely arranged guide forks, one of which the strand 11 during his cut and the other a knife 21 during the strand cutting leads.

The cutting tube includes a mounting end 1 and one the attachment end 1 opposite, free end 2 , in particular from 3 is apparent.

The attachment end 1 is provided with a rectangular in section upwardly open attachment groove for receiving a molded part, not shown, of a support arm, also not shown. The attachment end 1 is with a parallel to the aforementioned groove extending, cylindrical bore 3 provided for receiving a clamping bolt, not shown, which has two threaded holes for receiving fastening screws. The groove bottom of the aforementioned fastening groove has two through holes 4 for the fixing screws, of which one in 4 (upper part) is shown.

The Schneidtube is made of powder metallurgical steel, has a high hardness and is on the above-described, klem mende fastening by the clamping bolt, the threaded holes, the mounting screws and the through holes in a material-optimized manner reliably releasably and adjustably attached to the support arm. As in 4 shown, are aligned with the above-mentioned through holes 4 one blind hole each 5 arranged opposite to the groove bottom of the mounting groove on the circumference of the bore for receiving the clamping bolt. The attachment end 1 may also be designed differently in a modification of the present embodiment, for example, as is apparent from the publications mentioned above.

The cutting tube has a first end face 6 and one of the first end face 6 , opposite second end face 7 on. The first front page 6 and the second end face 7 each have one to the free end 2 towards inward angled course (cf. 1 and 2 ).

Cross to the first end 6 and the second end face 7 (see 1 and 2 ) is an entry side 8th which is in a top view 2 is shown, and the entrance side 8th Opposite an exit side 9 which is in a top view 1 is shown arranged.

At the free end 2 The cutting tube is an outwardly open groove 10 for guiding a strand 11 during a cut. With the groove 10 becomes the strand 11 radially, alternately overlapped and released when the cutting tube is driven cyclically on its support arm, wherein they are the strand 11 approaches, takes hold of him, supports, then releases again and moves away from him.

The groove 10 has a from the first end face 6 up to the second end face 7 extending groove bottom 12 on. From the groove bottom 12 extends outwards, towards the free end 2 the Schneidtube a first groove wall 13 and one outwards, towards the free end 2 the cutting tube second groove wall 14 , The first groove wall 13 is on the outside of the outlet side 9 limited and is with a first passage gap 15 Mistake. The second groove wall 14 is outside of the entrance side 8th limited and is with a second passage gap 16 Mistake.

The first passage gap 15 and the second passage gap 16 are each transverse to the longitudinal extent of the groove bottom 12 arranged. By this arrangement, a section is ensured in which the end faces of the cut strand sections are aligned and flat exactly transverse to the longitudinal axis of the strand. The first passage gap 15 extends from his at the free end 2 situated foot 17 up to his over the groove bottom 12 lying headboard 18 ,

The second passage gap 16 extends from his at the free end 2 situated foot 19 up to his over the groove bottom 12 lying headboard 20 ,

The longitudinal extent of the first passage gap 15 and the second passageway gap 16 or the first groove wall 13 and the second groove wall 14 are dimensioned such that an in 3 schematically partially broken illustrated knife 21 at the beginning of his contact with the strand 11 already in both transit hospitals 15 . 16 or the first groove wall 13 and the second groove wall 14 is guided in a thus formed cutting gap. This ensures a particularly precise cut.

In a modification of the illustrated embodiment, the respective longitudinal extent of one of the passage gaps 15 . 16 or the two passage gaps 15 . 16 or the respective groove wall 13 . 14 reduced so that at a cut start of the strand 11 the knife 21 only in one of the passage gaps 15 . 16 is led, there is a reduced - but also still usable - cut quality.

The head end 20 of the second passage gap 16 points towards the exit side 9 towards expanding passage cross-section. The head end 18 the first passage gap 15 points towards the exit side 9 towards expanding passage cross-section.

In a modification of the illustrated embodiment may also be provided, the headboard 20 with an at least partially constant, non-expanding passage cross-section and the head end 18 with one in the direction of the exit side 9 widening passage cross-section to provide a sufficient self-cleaning effect.

In the in the 1 to 4 illustrated embodiment, the first groove wall 13 and the second groove wall 14 the same length. They extend the same length at the average in semi-circular groove bottom 12 then to the free end 2 with the respective formation of an end phase (cf. 3 and 4 ).

The phases of the two mutually facing groove walls 13 . 14 form one to the free end 2 diverging section of the groove 10 with which the strand 11 is gently übergreifbar.

The first passage gap 15 is designed longer than the second passage gap 16 , in relation to their respective extension from their respective, at the free end 2 lying foot end 17 . 19 up to their respective above the groove bottom 12 lying headboard 18 . 20 ,

Also in case of uneven long groove walls 13 . 14 is the first passageway 15 longer than the second passage gap 16 formed, but with respect to their respective extent of the groove bottom 12 up to their respective above the groove bottom 12 lying headboard 18 . 20 ,

The passage cross section of each passage gap 15 . 16 is in the direction of the longitudinal extension of the respective passage gap 15 . 16 towards the attachment end 1 the cutting tube in the area of the head ends 18 . 20 formed widening. Expressed differently, their respective width or clear width takes over the bottom of the groove 12 at least in sections. To the bottom of the groove 12 and a certain part beyond that to the beginning of the head ends 18 . 20 each have a narrow parallel gap, in particular with a gap width of about 0.3 mm, depending on the width of the knife 21 considering a desired game.

The first passage gap 15 and the second passage gap 16 are with their respective headboards 18 . 20 from the exit side 9 to the entrance side 8th or seen in reverse viewing direction in each other transiently formed (see 3 and 4 ). In this way creates a continuous cutting gap, as explained above.

The cutting tube forms one from the entrance side 8th in the area of the head end 20 to the exit side 9 in the area of the head end 18 extending and widening passage space 22 for the knife 21 out. The passageway 22 has a substantially teardrop-shaped contour in section. The teardrop-shaped contour is formed by a from the inlet side 8th to the exit side 9 extending partial cone lateral surface 23 and to the partial cone surface 23 each circumferentially subsequent, flat passage phases 24 , The formation of the aforementioned contour is particularly detailed from the 4 for clarity in 3 a simplified representation of this contour is reproduced. In 4 is the aforementioned transition from the Teilkegelmantelfläche 23 to the passage phase indicated by a solid line.

The passageway 22 has one from the entrance side 8th to the exit side 9 extending upper boundary line 25 on (in 3 from right to left and in 4 running from left to right), which is arranged rising relative to the Horizonta len. The upper boundary line 25 forms the line of partial cone lateral surface 23 , on which the - viewed in section - the farthest from the groove bottom 12 or the free end 2 - Depending on the reference point - distant points of the passage space 22 lie. The angle α of the increase is in the illustrated embodiment in about 2 °. He should hardly fall below an angle of 1 ° in modifications of the embodiment.

The passageway 22 points two from the entrance side 8th to the exit side 9 extending lower boundary lines 26 on (in 3 from right to left and in 4 running from left to right), which are arranged in each case falling relative to the horizontal. The lower boundary lines 26 are each through a passage phase 24 and a respective inside in the first passage gap 15 and in the second passage gap 16 provided guide plateau 27 educated. The two lower boundary lines 26 are each inclined to the horizontal in the illustrated embodiment. The angle β of the inclination is in the illustrated embodiment in about 11 °. He should hardly fall below an angle of 1 ° in modifications of the embodiment.

On the entrance side 8th is, in particular 2 in plan view and 3 shows in section, a the second passage gap 16 u-fömig embracing, from the entrance side 8th outwardly projecting and partly outside on the second groove wall 14 extending paragraph 28 intended. By the paragraph 28 become the second groove wall 14 and the over the second groove wall 14 lying section of the cutting tube in the region of the second passage gap 16 increased in wall thickness.

As already explained above, both the first passage gap 15 , as well as the second passage gap 16 one guide plateau each 27 on. Every guide plateau 27 is flat and in the respective passage gap 15 . 16 formed protruding. Every guide plateau 27 extends from the entrance side 8th to the exit side 9 in a first direction. In a second direction, each guide plateau extends 27 from the respective lower boundary line 26 towards the free end 2 the cutting tube. The first direction is transverse to the above-mentioned second direction.

The respective leadership plateau 27 is on the entry side by a break-in phase 29 limited, which at the entrance side 8th in the second passage gap 16 is arranged extending and partly from the second groove wall 14 and partly from one to the head end 20 extending portion of the cutting tube is formed.

The respective leadership plateau 27 is out on the outlet side by a phase-out 30 limited, which at the exit side 9 in the first passage gap 15 is arranged extending and partly from the first groove wall 13 and partly from one to the head end 18 extending portion of the cutting tube is formed.

The guide plateau 27 is thus surrounded by adjacent surfaces, which seen from the guide plateau have a sloping course. In the embodiment described and explained above, the cutting tube is integrally formed. In a modification of the embodiment described above, however, a multi-piece design of the cutting tube is possible.

For example, a modification of the above embodiment by a two-piece design of a cutting tube made by two parts, which are connected to each other by means of fastening means. In such a modification, it is particularly advantageous to provide a dividing plane which extends through the planes of symmetry of the two passage gaps 15 . 16 extends, for example, along the section line AA according to 2 ,

In addition to the above description of the embodiment is to be noted that a sole design of a cutting tube with a minimized in terms of its support or contact surface Führungsplateau 27 It is already possible to reduce the occurrence of glue growths and deposits to a minimum. Alone already by this configuration, a life of such a cutting tube can already be significantly extended. Should there be glue deposits despite such a minimized support or contact area, these can be due to the proposed configuration of the passage gaps 15 . 16 or their head ends 18 . 20 be eliminated in the form of an ongoing self-cleaning effect.

In addition to the above-described and explained embodiments of the cutting tube is still with a view 4 to note that the design of the groove bottom 12 also leads to an optimized strand guidance. In the in 4 shown view of an embodiment of a Schneidtube is the groove bottom 12 by two in the longitudinal extent of the groove bottom 12 successive sections formed. At about the height of the first passage gap 15 a first section is provided, which has a cylindrical partial jacket surface. Subsequently, a second section is provided on this cylindrical partial jacket surface, which extends in the direction of the second end face 7 extends and has a partial cone sheath. Expressed differently, this second section again provides an entry area for the strand 11 formed, which a gentle absorption of the strand 11 guaranteed. The aforementioned first section in turn ensures precise guidance of the strand 11 immediately near the cut.

With the here proposed and explained training a Schneidtube a precise cut of the strand 11 achievable over extremely long, maintenance-free production intervals. The proposed cutting tube allows the use of otherwise difficult to handle glue types.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 2138834 [0008]
• - DE 2345063 [0008]
• - EP 1905316 A2 [0008]
• EP 1815757 A1 [0008]
• WO 2005/089574 [0008]

Claims (15)

Cutting tube for a strand ( 11 ) of the tobacco processing industry with an attachment end ( 1 ) and one the attachment end ( 1 ) opposite, free end ( 2 ), and with a first end face ( 6 ), one of the first end face ( 6 ) opposite the second end face ( 7 ), one substantially transverse to the first end face ( 6 ) and the second end face ( 7 ) arranged inlet side ( 8th ), one opposite the entrance side ( 8th ) arranged exit side ( 9 ) and with a strand ( 11 ) at the free end ( 2 ) for radially, alternately spreading and releasing the strand ( 11 ) open groove ( 10 ) for guiding the strand ( 11 ) during a cut which extends from the first end face ( 6 ) to the second end face ( 7 ) extending groove bottom ( 12 ) and one of the groove bottom ( 12 ) outwardly extending, first groove wall ( 13 ) and one opposite to the first groove wall ( 13 ) and of the groove bottom ( 12 ) outwardly extending second groove wall ( 14 ), wherein the first groove wall ( 13 ) on the outside of the outlet side ( 9 ) is limited and with a first passage gap ( 15 ) and the second groove wall ( 14 ) on the outside of the entrance side ( 8th ) is limited and with a second passage gap ( 16 ) and the first passage gap ( 15 ) and the second passage gap ( 16 ) transversely to the longitudinal extension of the groove bottom ( 12 ) are arranged, wherein the first passage gap ( 15 ) from his at the free end ( 2 ) ( 17 ) up to its over the groove bottom ( 12 ) lying headboard ( 18 ) and the second passage gap ( 16 ) from his at the free end ( 2 ) ( 19 ) up to its over the groove bottom ( 12 ) lying headboard ( 20 ) and the head end ( 20 ) of the second passage gap ( 16 ) and / or the headboard ( 18 ) of the first passage gap ( 15 ) in the direction of the exit side ( 9 ) has expanding passage cross-section. Cutting tube according to claim 1, characterized in that the first passage gap ( 15 ) longer than the second passage gap ( 16 ) is formed, based on their respective extent of their at the free end ( 2 ) of the cutting tube located foot end ( 17 . 19 ) to their respective above the groove bottom ( 12 ) lying headboard ( 18 . 20 ) in the case of equal groove walls ( 13 . 14 ), in the case of uneven groove walls ( 13 . 14 ) relative to their respective extent starting from the groove bottom ( 12 ) to their respective above the groove bottom ( 12 ) lying headboard ( 18 . 20 ). Cutting tube according to claim 1, characterized in that the passage cross section in the direction of the longitudinal extent of a passage gap ( 15 . 16 ) is widening, in particular towards the attachment end ( 1 ). Cutting tube according to one of claims 1 to 3, characterized in that the first passage gap ( 15 ) and the second passage gap ( 16 ) with their respective head end ( 18 . 20 ) from the exit side ( 9 ) to the entrance side ( 8th ) are formed merging into each other. Cutting tube according to one of claims 1 to 4, characterized in that a from the inlet side ( 8th ) in the area of the head end ( 20 ) of the second passage gap ( 16 ) to the exit side ( 9 ) in the area of the head end ( 18 ) of the first passage gap ( 15 ) extending and widening the passage space ( 22 ) is trained. Cutting tube according to claim 5, characterized in that the passage space ( 22 ) has a substantially teardrop-shaped contour in section. Cutting tube according to claim 5 or 6, characterized in that the course of the from the inlet side ( 8th ) to the exit side ( 9 ) extending upper boundary line ( 25 ) of the passage space ( 22 ) is rising, in relation to the horizontal, in particular with an angle α of about 1 °. Cutting tube according to one of claims 5 to 7, characterized in that the course of a, from the inlet side ( 8th ) to the exit side ( 9 ) extending lower boundary line ( 26 ) of the passage space ( 22 ) is inclined, with respect to the horizontal, in particular with an angle β of more than 1 °. Cutting tube according to one of claims 1 to 8, characterized in that on the inlet side ( 8th ) a second passage gap ( 16 ) U-shaped encompassing, from the entrance side ( 8th ) outwardly projecting and partly on the outside on the second groove wall ( 14 ) extending paragraph ( 28 ) is provided. Cutting tube according to one of claims 1 to 9, characterized in that the first passage gap ( 15 ) and / or the second passage gap on the inside an at least partially planar and projecting guide plateau ( 27 ) exhibit. Cutting tube according to claim 10, characterized in that the guide plateau ( 27 ) on the entry side by a run-in phase ( 29 ), which in particular at the entrance side ( 8th ) into the second passage gap ( 16 ) is arranged extending and partly from the second groove wall ( 14 ) and partly from one to the head end ( 20 ) extending portion is formed. Cutting tube according to claim 10 or 11, characterized in that the guide plateau ( 27 ) on the outlet side by a phase-out phase ( 30 ) is limited, which in particular at the exit side ( 9 ) into the first passage ( 15 ) is arranged extending and partly from the first groove wall 13 and partly from one to the head end ( 18 ) extending portion is formed. Cutting tube according to one of claims 10 to 12, characterized in that the guide plateau ( 27 ) in the direction of the head ends ( 18 . 20 ) by an inside in the respective passage gap ( 15 . 16 ) intended passage phase ( 24 ), in particular from the entrance side ( 8th ) to the exit side ( 9 ). Cutting tube according to claim 13, characterized in that the passage phase ( 24 ) in the direction of the entrance side ( 8th ) to the exit side ( 9 ) increases in width and in particular is flat. Cutting tube according to one of claims 1 to 14, characterized in that it is formed in one piece or several pieces, in particular two pieces of two parts, which are connectable to each other by means of fastening means, with a through the two passage gaps ( 15 . 16 ) graduation level.