EP1800553A1 - Method for the functioning of a filter rod machine and filter rod machine - Google Patents

Abstract

The method of operation of a filter rod machine (1,2) for cigarettes uses filter strips (4) from a feed (50) including a filter material fed from a first bale (6) to a second bale (6'). For production of a filter string (24), a first sensor (37) detects the connecting point and produces a first signal (37a). At least in the area of the filter string, from the filter material strip (4) with the connecting point, further working is prevented.

Description

The invention relates to a method for operating a filter rod machine of the tobacco processing industry, wherein filter material is supplied from a supply of a format device of the filter rod machine and from the filter material, a filter strand is formed, wherein the stock comprises a strip of filter material, which is withdrawn from a first bale and the end of the filter material strip of the first bale is connected to the beginning of a filter material strip of a second bale at a connection point. The invention further relates to a filter rod machine of the tobacco-processing industry with a filter material dispensing station, from which a filter material strip can be dispensed from a filter material supply, and with a strand forming device, by means of the filter material strip, a filter strand can be produced.

A corresponding method and a corresponding device for producing filter rods for smokable articles are, for example, from DE 32 24 009 A1 known. In this document it is disclosed that the end of the expiring filter tow is connected to the beginning of a filter tow contained in a second bale. The connection point is stored and recorded on a detector means in good time before the end of the filter screen contained in the first bale. The outgoing end of the filter tow drawn off from the first bale lifts the connection point away from the detector means, which thereby generates a corresponding control signal. The control signal is used to adjust the conveyer and treatment devices passing through the filter tow to the passage of the thicker joint for decreasing the machine speed and / or ejecting the filter rod containing the joint.

It is an object of the present invention to provide a method for operating a filter rod machine of the tobacco-processing industry and a corresponding filter rod machine, by means of which a filter strand with high quality can be produced with as little filter material scrap.

This object is achieved by a method for operating a filter rod machine of the tobacco processing industry, wherein filter material from a supply of a format device of the filter rod machine is fed and from the filter material, a filter strand is formed, wherein the stock comprises a strip of filter material, which is withdrawn from a first bale and wherein the end of the filter material strip of the first bale is connected to the beginning of a filter material strip of a second bale at a connection point, wherein after the production of the filter strand a first sensor detects the joint and generates a first signal which serves to exclude at least the portion of the filter strand made from the strip of filter material with the joint from further processing.

By providing a first sensor which recognizes the joint after the production of the filter strand, it is much more possible to eject the region of the filter strand or filter rods which contain the joint.

In the context of the invention, the term excludes from further processing that the corresponding material is ejected, either as a finished filter rod or only later, when in a machine for the production of smokable articles of the tobacco processing industry, a corresponding filter with the smokable article or the smokable part of a smokable article is or was.

Preferably, the conveying speed of the strip of filter material is slowed down as soon as a second signal has been generated by a second sensor, after the second sensor has measured an exceeding of a predeterminable degree of the decrease in monitoring the decrease in the quantity of the filter material of the first bale. By this measure, which can for example also be supplemented by the fact that the swept by the filter material conveying and treatment devices are set to the passage of the thicker connection point, is used in particular to the filter rod machine and the corresponding components in the filter rod machine, through which the filter strand and thus also the connection point runs, to spare.

Preferably, the first signal also serves to increase the conveying speed of the filter material strip again immediately after detecting the connection point. In the context of the invention, reducing or increasing the conveying speed of the filter material strip also means, in particular, reducing or increasing the speed of the filter rod machine.

Preferably, the second sensor for generating the second signal is a photosensitive sensor which detects the reaching or the consumption of the last layer of the first bale. In particular, this is preferably a camera which, for example, records gray values. The filter material usually has a substantially constant gray value. This can be significantly different to a container in which the bale is stored or the substrate on which the bale is applied. As soon as the last layer of the bale has broken and the strip of filter material has been removed from the detection range of the first sensor, the gray value recorded by the sensor abruptly changes, so that a very accurate measurement of the consumption of the bale or the filter material in the bale is possible. Here, the detection range of the first sensor is preferably a narrow range. In addition, this narrow area will preferably be located where the last windings of the strip of filter material are located in the bale. The sensor may also detect the entire area of the bale or a portion thereof, so that an integral of the gray value of the entire area is recorded and thus the measured signal changes slowly from the value of one or more complete layers of filter material in the bale to completely deflated bale.

Preferably, the conveying speed of the strip of filter material slows down after a third signal has been generated by a third sensor representing movement of the junction to or in the filter rod machine. In such a sensor may be a corresponding sensor such as the DE 32 24 009 A1 act. The sensor there is designated by the reference numeral 44 or 51.

Preferably, the region of the produced filter strand is excluded from further processing which is produced during the slow conveying speed. The filter strand that is produced during the slow conveying speed usually has different properties than the filter strand that was produced at the normal, higher conveying speed, which is why this region is preferably excluded from further processing.

When the first bale is conveyed translationally, in particular horizontally, from a filter material delivery station to an exit, the second bale is conveyed in translation, in particular horizontally, from an inlet to the filter material delivery station, the inlet and the outlet being arranged on different sides of the filter material delivery station are, a particularly efficient and störungsunanfällige variant of the bale change is possible.

Preferably, when lowering the conveying speed, if the bales are positioned so that a guiding device is disposed substantially centrally of the bales in the filter material dispensing station, with filter material being drawn through the guiding device, the stretching of the filter material strip will not substantially change during the bale changing.

Preferably, the second bale is first placed substantially centrally after full emptying of the first bale under the guide device.

A further variant is when, for bale replacement, a guide device is provided in the filter material delivery station for guiding filter material to a removal device, which is pivoted from a position substantially centrally above the first bale into a position substantially centrally above the second bale. A further variant, which is preferred, is when a guide device is provided in the filter material delivery station for guiding filter material to a removal device, wherein the guide device is arranged substantially centrally between the first and the second bale. In the latter variant, the guide device is preferably stationary.

The object is further achieved by a filter rod machine of the tobacco-processing industry with a Filtermaterialabgabestation from which a filter material strip can be delivered from a filter material supply, and with a strand forming device by means of the filter material strip a filter strand is produced, wherein a first sensor is provided is configured to detect a junction of the filter material strip of a first filter material bale and the filter material strip of a second filter material bale, wherein the first sensor is arranged downstream of the strand forming device.

Preferably, a strand or Filterstabauswurfvorrichtung is provided downstream of the first sensor. Particularly elegant and material-saving is the filter rod machine according to the invention when the first sensor part of a measuring device or in a measuring device is provided, which is provided for determining the amount of components of the filter strand. For this purpose, in particular to the DE 102 00 320 A1 the applicant, which is to be incorporated in full in the disclosure of this patent application. Here, the sensor 37 shown in FIG. 1 or the sensor 38, which are called there measuring device 37 and 38, not only generate corresponding signals that are used to control components of the filter strand, but also for detecting the connection point. This makes it possible in particular to save another sensor or another measuring device. Preferably, the in Fig. 1 and the associated description of DE 102 00 320 A1 provided device used to detect a connection point in the filter strand and in particular to exclude at least this area of the filter strand, which includes the connection point to provide from further processing and / or to increase the speed of the filter rod machine back to a predetermined speed.

If a control device for controlling the speed of the filter rod machine is provided, wherein the output of the first sensor is connected to an input of the control device, a particularly efficient control of the speed of the filter rod machine is possible. Another preferred embodiment of the filter rod machine according to the invention, which has independent inventive character, then exists when a second sensor for monitoring the decrease in the amount of filter material of the first bale and for generating a second signal is provided at a predetermined level of decrease of the amount of filter material is exceeded , This allows a very precise control of the speed of the filter rod machine, in particular the time of slowing down the Filter strand machine makes more precisely specifiable. Preferably, the output of the second sensor is connected to the input of a control device for controlling the speed of the filter rod machine. Further preferably, the second sensor is a photosensitive sensor, in particular a camera.

A particularly efficient and secure transfer of bales is possible if a filter material dispensing station is provided, in which two bales of filter material arranged next to one another can be introduced, wherein the bales can be conveyed, in particular horizontally. Preferably, a guide device for guiding filter material from a bale to a take-off device is provided, wherein the guide device is at least temporarily stationary.

If the guide device is arranged substantially centrally over a bale or two bales, a uniform pre-stretching of a strip of filter material is possible. Preferably, the guide device is designed to be pivotable, wherein a guide element is pivotable from a position substantially centrally above the first bale to a position substantially centrally above the second bale. The guide device is or preferably comprises a ring (s).

Fig. 1

eine schematische Seitenansicht einer Ausführungsform einer erfindungsgemäßen Filterstrangmaschine,

Fig. 2

eine schematische Draufsicht auf einen Teil einer erfindungsgemäßen Filterstrangmaschine in einer anderen Ausführungsform,

Fig.3

eine entsprechende schematische Draufsicht gemäß Fig. 2 in einem fortgeschrittenen Verfahrenszustand,

Fig.4

eine schematische Draufsicht entsprechend Fig. 3 in einem weiter fortgeschrittenen Verfahrenszustand,

Fig. 5

eine schematische Draufsicht auf einen Teil einer erfindungsgemäßen Filterstrangmaschine in einer weiteren Ausführungsform,

Fig. 6

eine schematische Draufsicht auf einen Teil einer erfindungsgemäßen Filterstrangmaschine in einer weiteren erfindungsgemäßen Ausführungsform.

The invention will be described below without limiting the general inventive idea by means of embodiments with reference to the drawings. With respect to all details of the invention not explained in detail, reference is expressly made to the drawings. Show it:

Fig. 1

a schematic side view of an embodiment of a filter rod machine according to the invention,

Fig. 2

1 is a schematic plan view of a part of a filter rod machine according to the invention in another embodiment,

Figure 3

FIG. 2 shows a corresponding schematic plan view according to FIG. 2 in an advanced method state, FIG.

Figure 4

3 is a schematic plan view corresponding to FIG. 3 in a further advanced method state,

Fig. 5

1 is a schematic plan view of a part of a filter rod machine according to the invention in a further embodiment,

Fig. 6

a schematic plan view of a portion of a filter rod machine according to the invention in a further embodiment of the invention.

1 shows a schematic side view of an embodiment according to the invention of a filter rod machine comprising a treatment device 1 and a processing device 2. The filter rod machine is used to produce a filter strand 24, for example for the production of filter rods 28 for cigarettes and other smokable articles. The illustrated device for producing filter rods 28 may, for example, be a model of the product line KDF marketed by the applicant. The device consists of two main assemblies, a processing device 1 for filter tow supplied in an endless filter material strip 4 and a processing device 2 for producing wrapped filter rods 28.

The processing device 1 has a pair of rollers 3 for the continuous removal of an endless filter material strip 4 from a bale 6. After removal from the bale 6 of the filter tow 4 passes on its way to the pair of rollers 3, on which it is guided over a guide roller 5, two air nozzles 7 and 8, which serve to spread and loosening of the fabric of the filter material strip 4.

In the direction of movement of the strip of filter material 4 after the air nozzle 8 and before the pair of rollers 3 is serving as an air conditioning device for the filter material strip 4 climatic chamber 10 through which the filter material strip 4 is passed. In the climatic chamber 10, the filter material strip 4 is supplied with water vapor from a water vapor source 10a or dry hot air from a hot air source 10b. To regulate the humidity of the filter material strip 4, the humidity in the climate chamber 10 can be controlled by the supply of water vapor can be controlled by means of one of a control or regulating device 43 according to arrow 10e or control line 10e controllable control valve 10c, while the supply of dry hot air can be controlled by means of a controllable by the control or regulating device 43 via the control line 10f control valve 10d.

After the climatic chamber, a pre-stretching roller pair 13 provided with a drive controllable by a control 14 is arranged to pre-stretch the filter material strip 4. The stretching of the filter material strip 4 to eliminate the so-called residual crimp in the strip of filter material is done by deflecting the strip of filter material 4 from its movement path through a dancer roller 15. The dancer roller 15 is acted upon via a controllable by the controller 14 actuator 16 with a defined force, so that the Tensile stress in the filter material strip 4 between the Vorreckwalzen 13 and the roller pair 3 assumes a desired predetermined value. As a result, the residual crimp in the strip of filter material 4 is pulled smoothly. This results in a variable extension of the filter material strip 4, whereby the position of the dancer roller 15 changes. The position of the dancer roller 15 is measured by the controller 14 via the actuator 16 and controlled by controlling the conveying speed of the Vorreckwalzen 13 to a constant value. To this is on the DE 101 52 162.6 referred to the applicant.

The roller pair 3 is followed by two further roller pairs 9 and 11. All roller pairs 3, 9 and 11 are driven individually. The rotational speed of the roller pair 9 essentially corresponds to the conveying speed in the processing device 2. The rotational speed of the roller pair 3 is smaller than that of the roller pair 9, so that the roller pairs 3 and 9 form a stretching device for the material strip 4. By stretching the mass of the filter tow is determined in the finished filter rods 28, whereby the mass can be adjusted by controlling the conveying speed of the first pair of rollers 3. The rotational speed of the roller pair 3 can be controlled according to the control line 3a by a control / regulating device.

Between the pairs of rollers 9 and 11 is an applicator 12 for applying a plasticizer, such as triacetin, on the guided between the roller pairs 9 and 11 guided filter material strip 4. The supply of the plasticizer to the applicator 12 by means of a metering pump 33 via a feed line 34 from a softener supply 36. The metering pump 33 can be controlled by the control or regulating device 43 via a control line 33a.

The processed, sprayed with plasticizer strip of filter material 4 passes over the pair of rollers 11 of the processing unit 1 in an inlet hopper 17 of the housing 2a having a processing device 2, in which he summarized and on a deducted from a reel 18 and by means of a glue nozzle having Beleimvorrichtung 19 with Glued serving wrapper strip is hung up. The wrapping strip 21 and a filter material strand 4a formed by combining the filter material 4 reach a format strip 22 which guides both components through a format 23 which wraps the wrapping strip 21 around the filter material bar 4a and forms an endless filter strand 24. The speed of the format belt 22 is controlled by a main controller 25 via a control line 25a and tuned to the also determined by the main controller 25 by controlling the drives of the roller pairs 9 and 11 according to the control lines 25a and 25c specific conveying speed of the stretched filter tow 4.

The filter strand 24 passes through a seam plate 26, in which the adhesive seam is dried. Subsequently, filter rods 28 are cut off continuously from the filter strand 24 by means of a knife apparatus 27, which are transferred by an accelerator 29 into a discharge drum 31, in which they are conveyed in the transverse-axial conveying direction. From the Ablegertrommel 31 enter the filter rods 28 to a Ablegerband 32, from which they are fed to a further processing or intermediate storage or excluded from further processing by an ejector, not shown.

Downstream of the seam plate 26 and upstream of the knife apparatus 27, a first and a second measuring device 37, 38 are arranged, which are the proportions of the components of the strand 24, namely dry filter tow, softener and water can detect separately. The second measuring device 38 comprises a microwave measuring system with a measuring head with a microwave source and a microwave detector, which detects the microwaves emanating from the microwave source and penetrates the filter strand 24 to generate and deliver two measured values 38a and 38b to the evaluating device 42. These measurements allow, for example, a statement about the water content and the common proportion of the chemically similar components plasticizer and filter tow in the filter strand 24. A suitable measuring method and a corresponding device are, for example, from EP 0 791 823 A2 to be taken from the applicant.

The measuring frequency of the measuring device 37 may be in the range of radio or microwaves or in the optical or in the infrared range. When using wavelengths in the infrared range, the first measuring device 37 comprises an optical measuring head with an infrared radiation source and an infrared detector, which detects the emanating from the infrared radiation source, the filter strand 24 penetrating infrared waves. The intensity of the infra-red light penetrating the filter strand 24 is not influenced by a proportion of plasticizer in the filter strand 24, so that the infrared detector emits an evaluation signal to the evaluation device 42 via an amplifier which corresponds only to the proportion of the dry filter tow material in the filter strand 24. In this way, in a particularly simple manner, the connection point 45, which can be detected by connecting the end of the filter strand 4 from the bale 6 with the beginning of the filter strand 4 ', which is produced from the bale 6'. Instead of the infrared measuring head, a measuring head can be used, which works with microwaves. This may be a cavity resonator, which is acted upon by only one frequency act. For measurement in the range of Radio waves can be provided, for example, a nuclear magnetic resonance measurement in which the magnetic moments of the atomic nuclei of the substance to be measured are aligned by an external magnetic field and then excited by radio waves in an energetically higher state in which they are oriented substantially parallel to the external magnetic field. A possible embodiment of such a measuring device, for example, the DE 33 12 841 A1 taken from the applicant.

In order to enable an efficient and gentle filter material transition from a bale 6 to a bale 6 ', is, in particular according to FIG. 1, proceed as follows. First, the end of the filter material strand 4 of the bale 6 is connected, for example, in a connecting device 48 with the filter material strip 4 'of the bale 6', so that a junction 45 results, for example, twice as much filter material as the filter material strips 4 and 4 '. A connection can be made, for example, with an adhesive.

By continuous removal of the filter material strip 4 by the guide ring 49 in the processing device 1, the bale 6 is reduced or shrinks this existing in the bale 6 material more and more. By means of an optical sensor 46, which may be a camera, for example, is detected in the detection direction 47, when the last layer of filter material strip 4 is reached in the bale 6 or when the last layer of the filter material strip 4, the area was deducted in the detection 47th of the optical sensor 46 is located. At this moment, a signal is supplied to the main controller 25 via a signal line 46a, for example. Thereupon, the speed is instantaneously or with a predeterminable time delay, which in particular depends on the speed of the removal of the filter material strip 4 the filter rod machine reduced. It is also the components through which the filter material strip 4 passes, are at least partially pulled apart, so that the components of the filter rod machine are spared by the reduced speed and also the pulling apart of these components. A corresponding signal may also be supplied to the main control 25 from a third sensor 48 ', which represents the removal of the connection point 45 from this sensor.

The joint 45 then passes through the filter rod machine and in particular the processing device 1 and the processing device 2 and is wrapped in the format 23 by a wrapping material strip 21 and formed into a filter strand 24. The measuring device 37 can then be designed as above in order to detect the moment in which the filter strand has the connection point 45. This signal can then be used to exclude this area of the filter strand from further processing and / or to increase the speed of the filter rod machine again to a higher predefinable value. It may also be useful to exclude the portion of the filter string from further processing made during the slower operation of the filter rod machine.

Fig. 2 shows a plan view of a part of a filter rod machine according to the invention in a further embodiment. It is the treatment device 1 shown schematically, starting from which a boom 51 holds a guide ring 49 through which the filter material strip, not shown, is guided. Furthermore, no bales are shown, but only corresponding bale containers 60 and 60 '. In Fig. 2, the bale container 60 and thus located in this bale container not shown bale centered below the guide ring 49 arranged to achieve the lowest possible and constant pre-stretching of the filter material strip. The end of the filter material strip 4 leads to a connecting device 48, in which this is connected to the beginning of a further strip of filter material 4 '. It is also the out of the bale container 60 'leading out end of the filter material strip marked with 4 ".

The bale container 60 is located in a filter material dispensing station 50 which is preferably hermetically sealed. There are two locks 52 and 52 'are provided to prevent connection with the ambient air. Also shown in FIG. 2 is the optical sensor 46 which detects the end of the filter material strip of the bale disposed in the bale case 60. Further, the joint 45 is shown and also shown that the end of the filter material strip 4 "of the bale, which is arranged in the bale container 60 ', is introduced into the connecting device 48.

FIG. 3 shows the device from FIG. 2 in a schematic top view, with the bale container 60 'being introduced into the filter material delivery station 50. The bale container 60 is still in an emptying position and the bale container 60 'in a kind of waiting position.

4 shows a further plan view of the embodiment according to FIGS. 2 and 3 in an advanced process stage, in the meantime the bale container 60 has been completely emptied out of the filter material dispensing station 50, the bale container 60 'has been transported centrally under the guide ring 49 into the emptying position and another bale container 60 "in the Near the entrance lock 52 'of the filter material delivery station 50 has been promoted. The end of the filter material strip 4 "of the bobbin which is arranged in the bale container 60 'is connected via a schematically indicated connection 45 to the beginning of the filter material strip 4 of the bale in the bale container 60" and the end of this filter material strip 4' is already in the connection device 48 been introduced.

The exemplary embodiment illustrated in the exemplary embodiments of FIGS. 2 to 4 makes it possible to change without changing the filter rod machine when changing a filter material strip bale or tow bale. The only manual intervention is to connect the filter material strip end of the drainage ball to the beginning of the new bale. In particular, according to FIGS. 2 to 4, an automatic sequence takes place with a corresponding transport system of the bales.

FIG. 5 shows a further plan view of part of a filter rod machine according to the invention, this being an alternative embodiment of the invention. In this embodiment, two bale containers 60 and 60 'are disposed in the filter material discharge station 50. The transition from one bale to another bale occurs in particular in that the guide ring 49 is pivoted from a substantially central position above the one bale to a substantially central position above the further bale. The current position is shown by a solid line of the guide ring 49 and a holder of the guide ring 49 and the alternative position by a dashed and slightly lighter gray representation. Accordingly, it is possible to pivot the optical sensor 46 by a device, not shown, or to move accordingly. After emptying a container 60 and 60 ', the sensor 46 is thus moved to the corresponding position above the substantially complete bale and also according to the guide ring 49 is pivoted substantially in the middle above the bale. The empty bale container can be replaced by a full bale container. It is also possible to move the connecting device 48 accordingly.

In this embodiment, possible variations in the pre-stretch during bale exchange are compensated by the pivot mechanism of the trigger ring. The Towballenzuhr or the Ballenbehälterzu- and removal can be done automatically or not automatically.

FIG. 6 shows a further schematic plan view of part of a further filter rod machine according to the invention, wherein the guide ring 49 is arranged substantially centrally between the two bale containers 60 and 60 '. Also in this embodiment, the optical sensor 46 can be moved accordingly. The method is indicated in this figure by a double arrow.

In all embodiments, it can be provided that a camera or an optical sensor 46 detects the end of the bale and gives a signal to the machine control. The machine speed is then preferably lowered to safely drive the joint through the machine. When the joint passes through the machine, it is detected by a sensor and ejected from the machine. The machine then runs up again to set speed.

In the corresponding automatic method, in particular According to FIGS. 2 to 4, the beginning and the end of the respective bales are connected by an operator by means of the connecting device 48. After the joint has been created, the joint is positioned accordingly. There is then, for example, a push of a button, so that the new bale can be driven into the cabin or the filter material dispensing station 50 and positioned there. The tow strands or filter material strands are guided so that they do not twist during retraction. At this moment, a new bale can be delivered. The intended sensor 46 detects the last position in the outgoing bale. The machine speed is lowered and the two bales present in the filter material delivery station 50 are moved so that they are centered on the extension arm 51. The joint is retracted and the sensor 37 of Figure 1 recognizes the joint and the joint is then ejected. After ejection of the tow connection point, the new bale moves centrally to the extension arm 51. The expired bale or container for this purpose is discharged. As soon as the corresponding position is reached, the machine is accelerated again to the maximum line speed.

LIST OF REFERENCE NUMBERS

1

treatment device

2

processing device

2a

casing

3

roller pair

3a

control line

4, 4 ', 4 "

Filter material strips

4a

Filter material strand

5

idler pulley

6, 6 '

bale

7

air nozzle

8th

air nozzle

9

roller pair

10

climatic chamber

10a

Steam source

10b

Warm air source

10c

control valve

10d

control valve

10e

control line

10f

control line

11

roller pair

12

applicator

13

Vorreckwalzenpaar

14

control

15

dancer roll

16

actuator

17

feed hopper

18

reel

19

gluing device

21

wrapping strip

22

format tape

22a

driving device

23

format

24

filter rod

25

main control

25a, b, c

control line

26

Nahtplätte

27

knife apparatus

28

filter rod

29

accelerator

31

offshoot drum

32

offshoot band

33

metering

33a

control line

34

feed

36

plasticizers stock

37

first measuring device

37a

reading

38

second measuring device

38a, b

reading

42

evaluation

43

Control or regulating device

44

data line

45

junction

46

optical sensor

46a

reading

47

detection direction

48

connecting device

48 '

third sensor

49

guide ring

50

Filter material delivery station

51

boom

52, 52 '

lock

60, 60 ', 60 "

ball container

Claims (20)

A method for operating a filter rod machine (1, 2) of the tobacco processing industry, wherein filter material (4-4 ") from a supply (50) of a format device (23) of the filter rod machine (1, 2) is supplied and from the filter material (4-4). 4 "), a filter strand (24) is formed, the reservoir (50) comprising a strip of filter material (4-4") withdrawn from a first bale (6, 6 ') and the end of the strip of filter material (4-4 ") of the first bale (6) is connected to the beginning of a filter material strip (4-4") of a second bale (6 ') at a connection point (45), characterized in that after the production of the filter strand (24) a first sensor (37) detects the joint and generates a first signal (37a) which serves to cause at least the portion of the filter string (24) formed by the strip of filter material (4-4 ") with the joint (45) was excluded from further processing. A method according to claim 1 or the preamble of claim 1, characterized in that the conveying speed of the filter material strip (4-4 ") is slowed down after a second signal (46a) has been generated by a second sensor (46) as soon as the second sensor ( 46) in monitoring the decrease in the amount of filter material (4-4 ") of the first bale (6) has measured the exceeding of a predetermined degree of decrease. A method according to claim 2, characterized in that for generating the second signal (46a), the second sensor (46) is a photosensitive sensor, which detects the reaching or the exhaustion of the last layer of the first bale (6). A method according to claim 1, characterized in that the conveying speed of the strip of filter material (4-4 ") is slowed down, after a third signal has been generated by a third sensor (48 '), moving the connection point (45) to or in the Filter strand machine (1, 2) represents. Method according to one of claims 1 to 4, characterized in that the region of the produced filter strand (24) is excluded from further processing, which is produced during the slow conveying speed. Method according to one of claims 1 to 5, characterized in that, for the bale change, the first bale (6) is conveyed in a translatory manner from a filter material delivery station (50) to an exit (52), the second bale (6 ') being conveyed in translation from an inlet (52') to the filter material delivery station (50), wherein the input (52 ') and the output (52) are disposed on different sides of the filter material delivery station (50). A method according to claim 6, characterized in that when lowering the conveying speed, the bales (6, 6 ') are positioned so that a guide device (49) in the Filtermaterialabgabestation (50) substantially centrally of the bales (6, 6') with filter material (4-4 ") pulled through the guide device (49). A method according to claim 7, characterized in that the second bale (6 ') is arranged substantially centrally after the first bale (6) has been completely emptied under the guide device (49). Method according to one of claims 1 to 5, characterized in that for bale changing a guide device (49) in the filter material delivery station (50) for guiding filter material (4-4 ") to a puller (21, 24) is provided by a substantially centrally above the first bale (6) arranged position in a substantially centrally above the second bale (6 ') arranged position is pivoted. Method according to one of claims 1 to 5, characterized in that a guide device (49) in the filter material discharge station (50) for guiding filter material (4-4 ") is provided to a puller (21, 24), wherein the guide device (49) is arranged substantially centrally between the first and the second bale (6, 6 '). A filter rod making machine (1, 2) of the tobacco processing industry comprising a filter material dispensing station (50) from which a strip of filter material (4-4 ") can be dispensed from a filter material supply (6, 6 ', 6") and a strand forming device (23), by means of which from the filter material strip (4-4 ") a filter strand (24) can be produced, characterized in that a first sensor (37) is provided, which is designed to be a connection point (45) of the filter material strip (4-4") a first filter material bale (6) and the filter material strip (4-4 ") of a second filter material bale (6 ') to recognize, wherein the first sensor (37) downstream of the strand forming device (23) is arranged. Filter rod machine (1, 2) according to claim 11, characterized in that the first sensor (37) is part of a measuring device (37, 38) or in a measuring device (37, 38) is integrated, which is used to determine the amount of components of the filter strand (24) is provided. Filter rod machine (1, 2) according to claim 11 or 12, characterized in that a control device (25) for controlling the speed of the filter rod machine (1, 2) is provided, wherein the output of the first sensor (37) with an input of the control device ( 25) is connected. Filter rod machine (1, 2) according to one of claims 11 to 13 or the preamble of claim 11, characterized in that a second sensor (46) for monitoring the decrease in the amount of filter material (4-4 ") of the first bale (6) and for generating a second signal (46a) when a predeterminable Degree of decrease in the amount of filter material (4-4 ") is provided. Filter rod machine (1, 2) according to claim 14, characterized in that the output of the second sensor (46) to the input of a control device (25) for controlling the speed of the filter rod machine (1, 2) is connected. Filter rod machine (1, 2) according to claim 14 or 15, characterized in that the second sensor (46) is a photosensitive sensor, in particular a camera. Filter rod machine (1, 2) according to one of claims 11 to 16, characterized in that a Filtermaterialabgabestation (50) is provided, in which two juxtaposed bales (6, 6 ') filter material (4-4 ") can be introduced, wherein the Bales (6, 6 ') are translationally conveyed. Filter rod machine (1, 2) according to claim 17, characterized in that a guide device (49) for guiding filter material (4-4 ") from a bale (6, 6 ') to a take-off device (5, 13) is provided, the guide device (49) is at least temporarily stationary. Filter rod machine (1, 2) according to claim 18, characterized in that the guide device (49) substantially centrally via a bale (6, 6 ') or two bales (6, 6') is arranged. Filter rod machine (1, 2) according to claim 18 or 19, characterized in that the guide device (49) is designed to be pivotable, wherein a guide element (49) from a position substantially centrally above the first bale to a position substantially centrally above the second Bale is swiveled.

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