DE102017106133A1 - Method for controlling a strand cutter and strand machine of the tobacco processing industry - Google Patents

Abstract

The invention relates to a method for controlling a strand cutter (50) of the tobacco processing industry, wherein the strand cutter (50) is designed to form a strand (124, 124 ') formed on a stranding machine (1) into a strand part (124) which is insufficient for further processing ) and a suitable for further processing strand part (124 ') through. The invention further relates to a corresponding stranding machine. The method according to the invention is characterized in that it is possible to predetermine or specify at which point of the strand (124, 124 ') the strand (124, 124') is severed.

Description

The invention relates to a method for controlling a strand cutter of the tobacco-processing industry, wherein the strand cutter is designed to sever a strand formed on a stranding machine in an unsuitable for further processing strand part and a suitable for further processing strand part. The invention further relates to a rod making machine of the tobacco processing industry with a strand cutter, which is designed to cut a strand formed on the strand machine in a suitable for further processing and suitable for further processing strand part, wherein the stranding machine comprises an element insert, the elements, in particular Filter segments placed in a strand or to a strand, wherein a conveying device is provided which promotes the strand longitudinally in a conveying direction.

Here is under a strand of the tobacco processing industry or a strand which is severed by a strand cutter of the tobacco processing industry, a filter strand or a cigarette rod in particular to understand. When starting a stranding machine regularly the first part of the strand formed can not be used for further processing. Only after the formed strand has the required quality characteristics can it be introduced into the further production stages for further processing. It is therefore introduced the unusable initial part of the strand formed in a collecting container and separated from the subsequent usable strand.

This process is commonly referred to as strand cutting, strand breaking or strand cutting and was previously done manually by the operator. Meanwhile, however, corresponding automated devices are known. Such devices have deflecting or guiding means for discharging the unusable initial part of the strand, and they have release means to separate this unusable strand starting part from the subsequent quality strand. The unusable strand starting part is referred to in the context of the invention as an unsuitable for further processing strand part and the suitable quality strand or the quality strand is hereinafter called a suitable for further processing strand part.

Out DE 38 13 786 C2 The Applicant is known a corresponding device. In this document is a device for cutting a strand, which is produced on a rod making machine of the tobacco processing industry, at which the Strandabschneidevorrichtung between a strand forming device and the strand in use length dividing strand subassembly or strand cutting device is arranged and wherein the Strandabschneidevorrichtung a strand guide for deflecting the Strang and a rotating circular knife comprises, known, wherein the strand guide and the rotary circular blade are structurally united so that they are pivotable about a common pivot axis, which intersects with the axis of rotation of the circular blade, so that the rotating circular blade with its cutting edge to Cutting the strand is in this einschwenkbar.

The device for cutting a strand or the strand cutter in the context of this application or this invention thus serves to ensure at the start of a stranding machine that at the moment in which a high-quality strand is formed to cut this strand once, so that the high-quality strand can then be further processed and in particular can then be cut by a conventional cutting device into rod-shaped segments or rod-shaped articles of the tobacco-processing industry, which are then processed further. Thus, for example, tobacco sticks can be produced and fed to a filter attachment machine or filter segments having a multiple use length can be produced accordingly.

So far, it was unproblematic in the production of such products, where exactly in the strand a severing of the strand by a strand cutter took place, since for example in the case of a tobacco rod this is relatively homogeneous and the initial part that was severed, was not used. This looks the same with a filter strand. In a filter strand of filter segments, it was also rather unproblematic when or at which point of the strand cutter cuts through the filter strand. By providing hard filter elements or capsules, which may be filled with a liquid, such as menthol, however, process problems can occur if the strand is not cut in a targeted manner where no capsule is present or no hard filter element or another hard element.

The object of the present invention is to provide a secure and the quality of the strand not influencing possibility even through such strands, the capsules or hard elements, to sever the strand.

This object is achieved by a method for controlling a strand cutter of the tobacco processing industry, wherein the strand cutter is formed, one on one Extruded strand formed in a suitable for further processing strand part and a suitable for further processing strand part, which is further developed by that is specifiable, or is specified, at which point of the strand of the strand is severed.

By means of the method according to the invention, it is possible to efficiently prevent the strand cutter from cutting through places of the strand which would cause impairment of the strand or could disturb the strand cutter in its function or cause too rapid a wear.

If a multi-segment filter strand is preferably formed in which a more stable sheathing is used, and it is predetermined by which type of segment, in particular at which point of this segment, the severing takes place, such stable filter strands can also be severed. It is also possible that a tobacco rod is formed in which flavored capsules are incorporated. In this case, it is preferable if it is specified that the strand cutter, spaced apart from the capsules, cuts through the strand.

Preferably, for severing the strand, at least one dead time is detected between a cut-through control signal of a control device of the strand cutter and the moment of cut-through. As a result, the measured dead time or the detected dead time can be used very efficiently, for example, for the next severing of the strand. A dead time can arise, for example, when the strand cutter is pivoted or moved. A strand cutter according to the DE 38 13 786 C2 has a circular blade, which is pivoted through an axis, which is arranged substantially perpendicular to the axis of rotation of the circular blade, through the strand. Another strand cutter can be used, for example a strand cutter which is guided linearly through the strand for strand cutting with a rotating circular knife.

Preferably, the strand cutter serves to sever two or more strands made in parallel at the same time or to sever them one behind the other at short distances.

Preferably, the dead time is taken into account at least for the subsequent or subsequent severing of the strand. The dead time may change, for example, in that pneumatic parts can switch, for example, at different speeds, so that the dead time may possibly change over the service life of the strand cutter. By taking into account the dead time of a previous severing of the strand, this can be taken into account successively.

Preferably, for severing the strand, the strand velocity and timing of depositing or inserting filter segments or elements into the strand is considered.

Preferably, in the event that the strand cutter performs a pneumatically driven pivoting movement or movement, the applied air pressure is set in relation to the dead time. This has the advantage that it can be more accurately determined how long the dead time is when the applied air pressure is known. At a lower applied air pressure, the dead time will be greater than at a larger applied air pressure. The traversing movement will be performed faster at a larger air pressure than at a low air pressure, so that the moment in which a control signal or cut-through control signal is given to the strand cutter, the severing of the strand will be performed faster if the Air pressure is greater than at a lower air pressure.

Even with the provision of electric motors to provide a pivoting movement or a movement of the strand cutter, a corresponding dead time will be present. These too may possibly change depending on the applied voltage. It is preferably provided to provide a power supply, which provides a constant drive voltage for the pivoting movement or movement of the strand cutter.

Preferably, the point at which the strand is severed, in particular via the control device, can be predetermined by an operator and in particular changeable during operation of the stranding machine. This makes it possible that the operator makes adjustments to the position of severing the strand.

The object is further achieved by a rod making machine of the tobacco-processing industry with a strand cutter, which is designed to sever a strand formed on the strand machine in a suitable for further processing strand part and suitable for further processing strand part, wherein the stranding machine comprises an element insert, the Laying elements, in particular filter segments, in a strand or to a strand, wherein a conveying device is provided, which promotes the strand in a conveying direction longitudinally axially and wherein a control device is provided, which is designed to control the strand cutter so that the strand to a predetermined point of the strand is severed or is severable.

Preferably, the control device is provided with a line speed or speed of the conveyor device, in particular by a machine controller, and / or the control device is designed to use the line speed or the speed of the conveyor device of the strand cutter. As a result, the position accuracy of the point at which the strand is severed, can be improved.

Preferably, the control device takes into account a dead time between a cut-off control signal to be sent or sent from the control device to the strand cutter and the time of cut-through of the strand for the time of the cut-through control signal. The control device is thus preferably designed to send a cut-through control signal as a function of a dead time to the strand cutter, so that the strand cutter can initiate the cutting of the strand at the correct time. The dead time here is the time that elapses between the beginning of the transmission of the cut-through control signal by the control device and the time of complete severing of the strand.

In particular, a first sensor is provided which measures or detects the position of the strand cutter, in particular a position in which the strand cutter has completely severed the strand.

Preferably, the control device is provided with the time of insertion or application of the element on or in the strand or a position of the element inserter of the control device. More preferably, the control device thus receives information about when the element is placed in the strand or on the strand, a speed of the strand and thus, as the distance of the insertion point to the strand cutter is known, and the time that the element needed to get from the moment of insertion to strand cutter and a corresponding dead time required by the strand cutter to sever the strand.

Preferably, a second sensor is provided which, in the case of a pneumatically driven strand cutter, measures the air pressure for operating the strand cutter.

Particularly preferably, an input device is provided, by means of which an operator prescribes or changes the predefinable position at which the strand can be severed.

In strand machines of the tobacco processing industry, in particular Multifilterherstellmaschinen, it may make sense to align the section of the strand cutter on a particular segment or not to cut a particular segment. Accordingly, it is also useful in other machines, such as cigarette rod making machines, wherein in the strand elements are inserted, which should not be damaged, limit the cut of Strandausschneiders to areas where these elements are not present. Such elements or segments may be, for example, capsules with liquids or hard segments. About the control of the strand machine is known where the filter segments or elements in the strand or strand are in order to start the strand cutter accordingly or control. In this case, it makes sense to compensate for dead times, for example signal transit times, compressed air, generation or contact times, inertia, etc. For this purpose, preferably via an input unit, a correction value can be input, which preferably enables a correction in a positive or a negative direction. In addition, the dead time can be measured via an initiator or a sensor, which detects the end position of a strand cutter, and in particular be taken into account for the next cutting off. A corresponding strand cutter is provided according to the invention for providing the strand beginning, in which case the strand beginning of a strand to be used for further processing is meant. Here, preferably, a rotating circular blade is pivoted through the strand and thus cut the strand accordingly. In addition, such a strand cutter can also be used to separate the strand end, in particular when the machine is stopped.

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.

• 1 eine schematische Seitenansicht einer Multisegmentfilterherstelleinrichtung mit einer Strangmaschine,
• 2 eine schematische dreidimensionale Darstellung eines Strangabschneiders im Moment des Durchtrennens eines Strangs und
• 3 eine schematische Darstellung wesentlicher Elemente einer Strangmaschine.

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:

• 1 a schematic side view of a Multisegmentfilterherstelleinrichtung with a stranding machine,
• 2 a schematic three-dimensional representation of a strand cutter at the moment of severing a strand and
• 3 a schematic representation of essential elements of a stranding machine.

In the drawings, the same or similar elements and / or parts are provided with the same reference numerals, so that apart from a new idea each.

1 shows a schematic representation of a Multisegmentfilterherstelleinrichtung. It is a group-forming device 2 and a stranding machine 1. It is with respect to a corresponding Multisegmentfilterherstelleinrichtung particular to the DE 101 55 292 B4 directed.

The group picture device 2 has separate functional units 604, 605.1, 605.2 and 61.1. The functional unit 604 is a soft element unit by means of which two individual filter segments are added to a group of filter segments. The soft elements may be, for example, acetattow elements. For the functional units 605.1 and 605.2 these are also soft element units by means of which a single filter plug or a single filter segment of double the use length is supplied.

At the functional unit 61.1 it is a hard element unit. For example, an element with activated carbon granulate can be processed there. There are provided in the functional units each reservoir 53.1 - 53.3 and 54.1, wherein in the soft element unit 605.1 . 605.2 or 604 a soft element reservoir 53.1 - 53.3 is provided and in the hard element unit 61.1 a hard element reservoir 54.1 , In the soft element units 604, 605.1 and 605.2, soft segments or soft elements, for example of a cellulose acetate or a nonwoven, are processed and the processed segments are placed on a drum 64.1, 64.2. In the hard element unit 61.1 For example, hard segments such as sintered granules, granules-filled tubes or empty tubes are positioned on a drum 64.3.

The group picture device 2 is powered by a power supply unit 58 with energy. For example, multisegment filters for cigarettes having four filter elements can be produced by means of the multisegment filter production device according to FIG. The filter segments deposited on the drums 64.1 to 64.3 are placed on the drums, which are each subsequently followed (63.6, 63.7, 63.5 and 63.6), and combined to form groups of filter segments.

In the functional unit 62 , which is provided as a transfer unit, transfer drums 63.3, 63.2, 63.1 are provided which the group of filter segments to a beater 28 submit. The beater 28 turns the filter segments conveyed in the transverse-axial direction in a longitudinal axial conveying direction 12 and places the correspondingly accepted filter segments in a 1 not shown strand at the right end thereof. As an alternative, the transfer of the filter elements or filter segments, for example, according to the DE-OS 25 34 666 respectively.

The strand-forming device 1 forms a strand from the provided groups of filter segments in a conventional process. For this purpose, the filter segments are placed on a wrapping material strip, which is arranged on a format tape, and by a format device 44 guided. The wrapping material strip is usually stored on reels, which are not shown. Actually, in 1 a bobbin holder 30 shown. In addition, a gluing device 32 and a glue reservoir 33 shown.

Before depositing the filter rod groups on the wrapper strip this is glued. For this purpose, a first gluing device 32 provided, which applies a Innenbeleimung in the form of two juxtaposed, parallel glue strips on the wrapping strip. A second gluing device, which includes a glue reservoir 38, provides the wrapping strip in the region of one edge with a gluing strip for suture gluing.

When starting the stranding machine, this gluing is usually not yet possible with sufficient quality, so that initially a first strand section via a strand cutter 50 in a bin 56 is distracted. Only when the seam has reasonably closed or the machine has taken a corresponding speed, the strand cutter cuts 50 the strand formed in a first part which has landed in the refuse container and which is referred to as unsuitable for further processing strand part and another strand part, which is suitable for further processing and in the conveying direction 12 downstream of the strand cutter 50 can be further processed, for example in a cutting device 48 is cut in filter rods multiple use length. It is also in 1 a push-in drum 57 represented by means of the filter n-times or multiple use lengths, such as 2-, 4- or 6-fold Use length, for further processing, in particular for assembly with tobacco rods in another machine by means of the insertion drum 57 are pushed.

According to the invention is now provided, the strand cutter 50 by means of a control device 10 to control. For this purpose, some dashed lines are shown, the electrical connections of the control device 10 to the loading device or turning drum 28 , the format device 44 and the strand cutter 50 represent. Furthermore, electrical connections to corresponding sensors are shown, such as the sensor 18 which can serve to determine the insertion position or the exact time of insertion of filter segments or a second sensor 16 that can serve to drive the pivoting of the strand cutter 50 to measure present air pressure. In addition, a connection, not shown, to a sensor 14 with the control device 10 be provided, wherein the first sensor measures a position of the strand cutter, for example, an end position, immediately following the transection of the strand formed.

The control device 10 takes the conveying speed of the format device or the format band and the insertion time of the filter segment groups and can, with the help of the known distance and the speed of conveying the strand taking into account the dead time of the strand cutter 50 provide timely control of the motion of the strand cutter.

For this purpose, it is also possible for the operator to adjust the position of the cut or the severing of the strand. This is schematically in 3 shown. There is no turning drum like in 1 shown, but a Einlegerad 29 , by means of which groups of filter segments consisting of a hard segment 160 and a soft segment 161 in receiving troughs 162 are absorbed by the Einlegerad 29 to the strand 124 ' be moved and accordingly attached to the strand or stored. The strand 124 ' moves in the conveying direction 12 ,

The string cutter 50 whose construction is related to 2 will be explained in more detail, cuts the strand 124 ' at a predetermined location in the soft element 161 , The cut portion of the strand 124 enters a garbage container, not shown, whereas the remaining strand 124 ' in the conveying direction 12 to the left in 3 is further promoted. 3 shows the moment in which the strand 124 ' from the other strand part 124 was separated. By means of an input device 8, the operator can now the position Y of the cut relative to the beginning of the soft element or to the end of the soft element 161 to adjust. This can be done for example by a rotary knob or electronically via a touch display.

2 schematically shows in a three-dimensional representation of a corresponding strand cutter, for example, a strand cutter from the DE 38 13 786 C2 with reference to this document with regard to the design of the strand cutter 50 is fully referenced. The reference symbols used essentially correspond to the reference symbols from FIG DE 38 13 786 C2 , whereby for this application a 1 was prefixed. Only the strand cutter was marked with 50.

2 shows a strand cutter 50 in a schematic representation, which can be used for the inventive method in the strand machine according to the invention. Between the formatting device 44 and the cutting device 48 a corresponding strand cutter 50 is arranged. Through the strand cutter 50 the first part of the filter strand 124 formed after starting the stranding machine, which does not yet have the quality features required for further processing, is cut off. The cut off starting pieces or the cut off starting piece of the filter strand 124 gets into a collecting container or a refuse container 56 , The strand cutter 50 has a strand guide 136 for deflecting the unusable initial part of the filter strand 124 after starting the machine up. It is also an unillustrated circular blade provided that in the cover 142 is driven in rotation. The axis of rotation corresponds approximately to the cylinder axis of the housing 141 of the drive motor 139. The cover 142 has a recess in the effective range of the circular knife, not shown 148 , Through this recess suitable for further processing strand 124 ' be guided.

The drive motor 139 is with his case 141 over a bracket 149 around a pivot axis 151 pivotable.

The pivot axis 151 is arranged at a distance from the axis of rotation of the circular blade and perpendicular to this. There is also provided an anvil 152 for supporting the filter string 124 respectively. 124 ' at its cutting by means of the circular knife is used. The counter-holder 152 is for this purpose at the knife-engaging side of the strand 124 ' opposite strand side against the filter strand 124 ' movable. This is the counter-holder 152 pivotally formed.

Both for the pivoting movement of the strand cutter 50 about the pivot axis 151 as well as for the pivotal movement of the counter-holder 152 around a pivot axis 152a are appropriate in 2 only by double arrows symbolized pivoting means 153 and 154 intended. The pivot axes 151 and 152a are in a machine wall 156 stored, behind which are the actual, not visible here drive means. For this purpose, a pneumatic working cylinder can be provided, which at the same time the pivot drive of the strand cutter 50 (via the pivot axis) via corresponding lever arrangements 151 ) and its counter-holder 152 (about the pivot axis 152a ). It can of course be provided for both corresponding controlled individual drives. Preferably, the drives should be tuned so that the anvil 152 undergoes a slight overfeed, so that it is already in the required for the separation cutback holding position before the circular blade on the filter strand 124 . 124 ' touches down.

In 2 is a position of the strand cutter 50 shown, in which the strand cutter 50 is pivoted with its cutting edge of the circular blade.

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. In the context of the invention, features which are identified by "particular" or "preferably" are to be understood as optional features.

LIST OF REFERENCE NUMBERS

1

rod machine

2

Group-forming device

8th

input device

10

control device

12

conveying direction

14

first sensor

16

second sensor

18

third sensor

28

beater

29

insertion wheel

30

bobbin mounting

32

gluing

33

glue reservoir

38

reservoir

44

conveyor

48

cutter

50

strand cutter

53.1 - 53.3

Soft element reservoir

54.1

Hart element reservoir

56

garbage Bin

57

Einstoßtrommel

58

Power supply unit

61.1

Hard element unit

62

Transfer unit

63.1 - 63.7

Transfer drum

64.1 - 64.3

Assembly drum

124, 124 '

filter rod

136

strand guide

139

drive motor

141

casing

142

cover

148

recess

149

bracket

151

swivel axis

152

backstop

152a

swivel axis

153

pivot means

154

pivot means

156

machine wall

160

hard segment

161

soft segment

162

receiving trough

605.1, 605.2

Soft element unit

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 3813786 C2 [0004, 0011, 0041]
• DE 10155292 B4 [0029]
• DE 2534666 [0033]

Claims (13)

A method for controlling a strand cutter (50) of the tobacco processing industry, wherein the strand cutter (50) is formed, formed on a stranding machine (1) strand (124, 124 ') in a suitable for further processing strand portion (124) and a for the further processing suitable strand part (124 ') durchzutrennen, characterized in that can be predetermined, or is specified, at which point of the strand (124, 124') of the strand (124, 124 ') is severed. Method according to Claim 1 , characterized in that a Multisegmentfilterstrang is formed and is specified by what kind of segment, in particular at which point of the segment, the cutting takes place. Method according to Claim 1 or 2 , characterized in that for severing the strand (124, 124 ') at least one dead time between a cut-control signal of a control device (10) of the strand cutter (50) and the moment of severing is detected. Method according to Claim 3 , characterized in that the dead time is considered at least for the subsequent or subsequent severing of the strand (124, 124 '). Method according to one of Claims 1 to 4 characterized in that for severing the strand (124, 124 ') the strand velocity and the timing of depositing or placing filter segments or elements in the strand (124, 124') is taken into account. Method according to one of Claims 3 to 5 , characterized in that in the event that the strand cutter (50) performs a pneumatically driven pivoting movement or movement, the applied air pressure is set in relation to the dead time. Method according to one of Claims 1 to 6 , characterized in that the point at which the strand (124, 124 ') is severed, in particular via the control device (10), can be predetermined by an operator and in particular during operation of the stranding machine (1) is variable. Extrusion machine (1) of the tobacco-processing industry with a strand cutter (50) which is designed to form a strand (124, 124 ') formed on the stranding machine (1) into a strand part (124) unsuitable for further processing and suitable for further processing Strangteil (124 ') durchse, wherein the stranding machine (1) has an element inserter (28), the elements, in particular filter segments, in a strand (124, 124') or to a strand (124, 124 ') sets, wherein a conveying device (44) is provided, which promotes the strand (124, 124 ') in a conveying direction (12) longitudinally axially and wherein a control device (10) is provided, which is designed to control the Strandschnechnider (50) so that the strand ( 124, 124 ') is severed at a predeterminable point of the strand (124, 124') or is severable. Stranding machine (1) after Claim 8 , characterized in that the control device (10) is provided with a line speed or a speed of the conveyor device (44), in particular by a machine control, and / or in that the control device (10) is designed, the line speed or the speed of the conveyor device (10). 44) for controlling the strand cutter (50). Stranding machine (1) after Claim 8 or 9 characterized in that the control device (10) takes into account a dead time between a cut-off control signal to be sent or transmitted from the control device (10) to the strand cutter (50) and the time at which the strand (124, 124 ') breaks for the time of the cut-through control signal , Stranding machine (1) according to one of Claims 8 to 10 , characterized in that the time of insertion or application of the element on or in the strand (124, 124 ') or a position of the element inserter (28, 29) of the control device (10) is provided. Stranding machine (1) according to one of Claims 8 to 11 , characterized in that a first sensor (14) is provided which measures the position of the strand cutter (50), in particular a second sensor (16) is provided, which in the case of a pneumatically driven strand cutter (50) the air pressure for driving of the strand cutter (50). Stranding machine (1) according to one of Claims 8 to 12 , characterized in that an input device (8) is provided, by means of which an operator predetermines or changes the predefinable position at which the strand (124, 124 ') can be severed.

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