EP3216356B1 - Glueing of strips of material for the tobacco processing industry - Google Patents

Description

The invention relates to a device for applying glue to a strip of material in the tobacco processing industry with a glue application element, in particular an anilox roller, arranged in a housing, with glue being or is conveyed away from the housing by means of a discharge line connected to the housing.

To connect cigarette filters to tobacco sticks, tipping paper sheets are usually provided which, on the one hand, each envelop the filter and, on the other hand, connect a head end of the tobacco stick to the filter with a protruding edge. The filter is usually joined to the tobacco stick by gluing, with glue being applied to a tipping paper strip from which the tipping paper leaves are cut.

From the European patent application EP-A-1 147 716 describes a device for applying glue to a wrapping material or a wrapping strip of a rod-shaped article in the tobacco-processing industry. In order to produce a glue pattern with glue-free areas on the wrapping strip, the device has means for interrupting the supply of glue to the wrapping strip.

Another glue applicator is off EP-A-0 616 854 known, wherein by means of the glue application device, liquid glue, in particular in the form of a glue pattern, is applied to a web of paper, plastic, cardboard or the like. Here, a glue is provided from a storage chamber in an engraving receiving and the glue is provided in an application zone in cooperation with a counter roller from the engraving onto the web. The glue application device described is preferably part of a filter attachment machine for cigarettes. Liquid glue, preferably aqueous polyvinyl acetate glue, is continuously applied to a tipping paper strip, which is then cut into tipping paper sheets to connect tobacco sticks and filter plugs.

In addition, under the name TPA3000 from CB Kaymich & Co. Limited, Sheffield, Great Britain, a gluing device for gluing tipping paper strips is known, which is used, for example, in filter attaching machines with the name MAX of the patent applicant. Here, glue is taken from a glue supply by means of a rotating wheel and introduced into a glue chamber. From the glue chamber, glue is removed by means of the anilox roller having cells and transferred to a predetermined transport speed applied covering paper strips.

At high production speeds on a filter attachment machine, e.g. up to 20,000 cigarettes per minute, it can happen that the glue is insufficiently applied to the covering paper strip or that gaps or interruptions form due to process-related malfunctions in the glue system.

In addition, in EP-B-1,500,438 a device for applying a flowable mass to a moving web of material in the tobacco-processing industry, in particular for applying glue to a web of paper, described, which is used as a gluing device in a filter attachment machine for the production of filter cigarettes. With this device, liquid glue is continuously applied from a supply to a tipping paper strip, which is then cut in the tipping paper sheet to connect tobacco sticks and filter plugs. With such a device, flowable masses, for example glue, of the most varied of types are applied to different webs of material.

In CH 676 805 A5 Furthermore, a method and a device for applying a flowable mass to a non-textile web are disclosed, the mass being removed from the supply by means of a removal conveyor and conveyed to the web. In particular, the removal conveyor is designed as an anilox roller. The mass not transferred to the web is conveyed back into the area of the supply by the removal conveyor, the layer of mass not transferred to the surface of the removal conveyor being conveyed through a channel through which the oppositely flowing mass is pressed.

Based on this state of the art, the object of the present invention is to improve the handling of gluing devices in the tobacco processing industry when used on machines in the tobacco processing industry, in particular filter attaching machines, in particular to increase the degree of cleanliness in a simple manner. This object is achieved by the features of claim 1.

In a device for applying glue to a strip of material in the tobacco processing industry with a glue application element arranged in a housing, in particular an anilox roller, glue being conveyed to the housing or glue application element by means of a feed line connected to the housing or is and / or where glue is or is conveyed away from the housing by means of a discharge line connected to the housing, it is provided that at least one flow stop device is provided in the feed line, such that a flow or backflow of the glue conveyed or conveyable in the feed line is or is prevented or reduced and / or at least one flow blocking device is provided in the discharge line, such that a flow or backflow of the glue conveyed or conveyable in the discharge line is or is prevented or reduced.

It is provided here that during a production stop of a machine in the tobacco processing industry, in particular a filter attachment machine, a gluing apparatus, which has an outer housing and a glue application element, for example in the form of an anilox roller, is completely removed from the machine, for this purpose, the supply line and / or the discharge line are detachably coupled to the housing of the gluing apparatus, whereby an uncontrolled leakage of glue from the housing or glue pot of the gluing apparatus or from the supply line and / or the discharge line to the, in particular open, , Joints is prevented. Since no glue escapes from the lines or from the housing due to the glue flow blocking devices provided at the connection points, the cleanliness in the area of the gluing apparatus on the machine is significantly increased. This also keeps the machine clean and improves the handling of the gluing apparatus.

The flow stop device is preferably arranged in the supply line between a pump, in particular a pressure pump, and the housing and / or the flow stop device is arranged in the discharge line between a pump, in particular a suction pump, and the housing. Here, the pump of the feed line and the pump of the discharge line are arranged outside the housing, ie outside the housing, and in particular on the machine side of the machine.

In addition, a further development is characterized in that the flow barrier device is designed as a constriction, in particular with a constriction or a line constriction device, which is configured with respect to the line cross-section of the supply line or the discharge line. A targeted narrowing of the flow cross-section in the supply line and / or in the discharge line also prevents the glue from flowing or flowing back into the supply lines.

For this purpose, it is further provided that the line constriction device is designed as a flow barrier disk or as a preferably controllable or regulatable valve. In this case, the flow barrier disk is preferably elastic, the flow barrier disk being designed to be self-opening, so that when a delivery pressure or suction pressure is applied, glue passes through the locking disk while conveying the glue, while when the conveying pressure is switched off, the locking disk automatically allows glue to pass through or exit the locking disk prevented. For this purpose, for example, the flow barrier disk is designed as an elastic disk with one or more slots. A flow of the glue in the supply lines, ie in the supply line and in the discharge line, can also be achieved by a switchable or adjustable valve, so that the valve is or is closed before the gluing apparatus is removed, so that no glue is conveyed in the supply lines , whereby no glue emerges from the housing or the lines at the point of separation of the supply line or the supply line and the discharge line.

Furthermore, it is provided in a preferred embodiment that the supply line and / or the discharge line each have at least one line coupling or connecting piece, preferably arranged on the housing of the glue application element, the flow blocking device preferably being formed in the area of the line coupling or in the line coupling. For example, the housing of the glue applicator has connecting stubs that are coupled to the supply line and / or the discharge line, the flow stop device being designed, for example, in the form of a valve, the valve being closed when the gluing apparatus is removed from the machine and when it is inserted on the machine and the connection to the supply line and / or the discharge line is or is open.

The line coupling of the supply line and / or the line coupling of the discharge line preferably each have a nozzle or connection piece, preferably protruding outward on the housing of the glue application member, so that the gluing apparatus or the housing of the gluing apparatus can be easily installed on the machine is or is connected or coupled to the glue supply lines. Correspondingly, safe decoupling from the glue supply lines is also possible when dismantling the gluing apparatus from the machine.

In one embodiment, the nozzles or the connecting nozzles on the housing have corresponding flow-blocking devices in order to prevent glue from dripping out or inadvertently escaping from the nozzles, for example during dismantling.

In addition, it is advantageous if the flow barrier device is designed as a vacuum source arranged in or on the supply line, so that glue is conveyed or can be conveyed in the supply line against the direction of flow of the glue provided in the supply line, or if the flow barrier device is in or on the discharge line arranged vacuum source is formed so that glue is conveyed or can be conveyed in the discharge line in the direction of flow of the glue provided in the discharge line, preferably with an interrupted or stopped glue supply in the supply line.

This makes it possible, for example, for glue to be withdrawn from the coupling point in the supply line or in the discharge line, whereby a flow barrier device is formed accordingly. By pulling back the glue at the contact point of the coupling or at the connection point, moving with negative pressure, the glue is also prevented from dripping out.

Furthermore, in a method for operating a device for applying glue to a strip of material in the tobacco processing industry with a glue application element arranged in a housing, in particular an anilox roller, glue being conveyed to the housing or glue application element by means of a feed line connected to the housing and / or wherein glue is conveyed out of the housing by means of a discharge line connected to the housing, the housing being releasably connectable to the feed line and / or the discharge line, it is provided that before decoupling the housing with the feed line glue from the feed line and / or from the housing by means of a vacuum source is sucked off and / or glue is removed from the discharge line and the housing before the housing is decoupled from the discharge line.

It is provided that before dismantling the gluing apparatus from a machine or before removing the housing of the glue applicator or the gluing device, glue from the housing and glue in the supply line or in the discharge line is at least partially removed, so that after the Removal or suction of the glue from the lines and / or the housing during the dismantling of the gluing apparatus, no glue drips out of the corresponding devices and the connection points, whereby a clean removal of the gluing apparatus is possible.

Furthermore, in one embodiment of the method it is additionally or alternatively possible that after coupling the housing of the gluing apparatus to the discharge line, the discharge line and the housing are filled with glue, in particular before glue is applied to a strip of material. The fact that an empty discharge line and an empty housing is introduced into the discharge lines and the housing before the machine or the gluing of a strip of material of the tobacco processing industry glue is put into operation means that after the machine or the gluing apparatus has been put into operation, little or no there is no air in the glue that is discharged from the housing via the discharge line.

Furthermore, in a device for applying glue to a strip of material of the tobacco processing industry with a glue application element arranged in a housing, in particular an anilox roller, glue is or is conveyed to the glue application element by means of a supply line connected to the housing and / or wherein by means of a Housing connected discharge line glue is or is removed from the housing, provided that two, in particular controllable, valves are provided in the supply line to the housing between a first feed pump or pressure pump and the housing, preferably in front of the inlet to the housing, and two, in the discharge line between the housing and a second feed pump or suction pump, in particular controllable valves are provided.

By using at least two switchable valves in the supply line and in the discharge line, on the one hand, a reliable operation of a gluing apparatus is achieved during the production of products on a machine in the tobacco processing industry, since glue is reliably used when the valves are switched in the flow direction via the supply line Pressure pump is conveyed and at the same time glue is sucked out of the housing from the discharge line via the valves switched in the open position and an output side of the second suction pump. In addition, a drip-free removal or dismantling of the gluing apparatus from the machine is achieved when the four valves are switched to the blocking position, so that a dripping out or an overflow of glue in the supply line or in the discharge line is avoided.

In addition, in a further embodiment of the device it is possible that a connecting line is provided between the supply line and the discharge line between two valves of the supply line and between two valves of the discharge line, whereby a type of bypass line is achieved between the supply line and the discharge line.

It is also advantageously provided that in the connecting line between the two valves of the supply line and between the two valves of the discharge line in the connecting line a, in particular controllable, valve is arranged. This makes it possible, by switching the valves in the supply line and the discharge line as well as in the connecting line between them via the already existing pressure pump and the suction pump, which is also present, to part of the tobacco processing industry after the gluing apparatus has been inserted at the corresponding point on the machine Drainage line and is filled after assembly of the gluing apparatus, in which case the first valve on the outlet side of the drainage line on the housing is switched to the open position, while the second valve of the drainage line is in the blocking position, so that glue from the pressure pump via the first output-side valve of the supply line and is conveyed via the valve in the open position of the connecting line to the discharge line, the first outlet-side valve in the discharge line also being in the open position, while the inlet-side valve on the housing to the suction pump in S. is locked. After the gluing apparatus has been placed on the machine, the valves in the supply line and the discharge line are switched to the open position, while the valve in the connecting line between the supply line and the discharge line is in the blocking position. To form a glue circuit, the pressure pump in the supply circuit and the suction pump in the discharge circuit are connected to a common glue supply, so that the pressure pump delivers glue from the glue supply, while the suction pump feeds the glue removed from the housing of the glue application unit to the glue supply via the discharge line .

To remove the gluing apparatus with the housing, the first outlet-side valve on the pressure pump is switched to the blocking position, while the second valve is in the open position. Further In the discharge line circuit, the first valve on the outlet side of the housing is in the blocking position, while in the discharge line the second valve arranged on the input side of the suction pump is in the open position, the valve arranged in the connecting line between the supply line and the discharge line also being in the open position, so that Before removing the gluing apparatus, glue is removed from the supply line and the gluing apparatus by applying a negative pressure via the suction pump.

When removing or dismantling the gluing apparatus from the production machine of the tobacco processing industry, for example a filter attachment machine, the valves of the supply line and the valve in the connecting line are in the blocking position, while when the suction pump is switched on, the valves on the discharge line are in the open position, so that glue is pumped out of the housing of the gluing apparatus. This is preferably done for a predetermined time in order to remove a predetermined amount of glue from the housing of the gluing apparatus. All valves are in the blocking position for removal, in which case both pumps, i.e. both pressure pump and suction pump, are switched off.

In addition, a closed glue circuit is formed on a machine in that the pressure pump or the first feed pump is connected on the input side to a glue store and / or the suction pump or second feed pump is connected to a glue store on the output side, the pressure pump and the suction pump being particularly preferably connected to the same glue store are connected.

The object is achieved by the features of claim 1 and further developed by a device for applying Glue on a strip of material in the tobacco processing industry with a glue application element arranged in a housing, in particular an anilox roller, whereby glue is or is conveyed to the housing or glue application element by means of a feed line connected to the housing and / or where glue is removed from the housing by means of a discharge line connected to the housing Housing is or is conveyed away, wherein the discharge line is connected to a glue supply, wherein the discharge line is designed with an air separation device, preferably arranged in the glue supply, in order to separate air bubbles contained in the discharged glue from the glue, which is further developed by the air separation device is arranged as a riser pipe in the glue supply, so that the glue flowing back in the discharge line is introduced into the glue supply through a riser pipe. The use of an air separation device in the glue circuit formed for the gluing apparatus removes air from the glue in a reliable manner, the air being preferably separated out as a result of gravity.

Furthermore, the device is advantageously developed in that in the lower area of the riser pipe and in the area of the connection between the discharge line and the glue supply a glue take-off point is provided outside the riser pipe, which is connected to the feed line for feeding glue to the glue application element. This makes it possible for glue that is returned to an opening in the glue supply to be introduced into the glue supply via the discharge line and, at the same time, using the riser pipe to separate out the air or air bubbles in the returned glue, and at the same point of contact with the glue supply or at the opening a removal point is also provided, the glue to be removed being removed in the lower region of the riser pipe.

In addition, a housing of a glue application device of the tobacco processing industry with a glue application device arranged in the housing, in particular an anilox roller, is provided, with a connection coupling for connecting a feed line for feeding glue into the housing being provided on the outside of the housing, with a coupling below the connection coupling A collecting container is arranged and / or a connection coupling is provided on the outside of the housing for connecting a discharge line for discharging glue from the housing, a collecting container being arranged below the connection coupling. By using collecting containers below the connection couplings, a reliable drip protection is achieved when removing a gluing device from the housing of the device.

Furthermore, a sensor is provided above the bottom of the housing in a housing of the glue application element of the tobacco processing industry with a glue application element arranged in the housing, in particular an anilox roller, the level of glue in the housing being detected in a contactless manner by means of the sensor. Because the glue level above the housing base is determined in a contactless manner, the level is reliably and directly monitored during the operation of a glue applicator on a machine in the tobacco processing industry, since the sensor is aimed at the free surface of the glue, so that the glue level in the housing is not monitored on the side of the wall surfaces of the housing, which means that no reliable level measurement is possible due to the adhesion of the viscous glue.

For this purpose, it is also provided that the sensor is an ultrasonic sensor is formed, wherein by means of the sensor an ultrasonic measurement signal generated is directed from above, preferably vertically, onto the free surface of the glue in the housing or above the housing base.

For this purpose, it is proposed according to an advantageous embodiment that a guide channel is arranged on the ultrasonic sensor so that the ultrasonic measurement signal in the guide channel is or is guided to an exit side of the guide channel, with the ultrasonic measurement signal from above, in particular vertically, onto the surface of the glue or on the exit side the bottom of the housing is or will be directed. The guide channel can be connected to the sensor, preferably releasably, on the coupling side of the ultrasonic measurement signal. The position of the sensor can be chosen arbitrarily; The decisive factor is that the ultrasonic measurement signal emerging on the outlet side of the guide channel is directed vertically downwards above the glue in the housing or above the housing base.

It is also provided that the sensor is arranged accordingly on the top of the housing.

It is further provided that glue is or is conveyed to the housing or glue application member by means of a supply line connected to the housing.

Furthermore, the object is achieved by a machine of the tobacco processing industry, in particular a filter attachment machine, which is equipped with an above-described device for applying glue to a strip of material in the tobacco processing industry, reference being expressly made to the above statements to avoid repetition.

Further features of the invention will become apparent from the description of embodiments of the invention together with the claims and can be seen in the accompanying drawings.

Fig. 1

schematisch einen Kreislauf für die Versorgung einer Leimauftragungsvorrichtung;

Fig. 2

schematisch eine Darstellung einer Leimauftragungsvorrichtung im Längsschnitt;

Fig. 3a, 3b

schematisch einen Verbindungsstutzen in einer perspektivischen Darstelllung und in einem Querschnitt

Fig. 4a, 4b

schematisch verschiedene Ansichten eines weiteren Verbindungsstutzens;

Fig. 5a

einen Querschnitt durch eine weitere Ausführungsform eines Verbindungsstutzens;

Fig. 6a, 6b

verschiedene Ansichten der Außenseite eines Gehäuses eines Leimauftragungsorgans;

Fig. 7

schematisch eine Verbindungskupplung einer Zuführ- und Abführleitung für Leim an einem Leimvorrat;

Fig. 8a bis 8d

schematisch einen Leimkreislauf zur Versorgung eines Leimauftragungsorgans der Tabak verarbeitenden Industrie mit Leim.

In the following, the invention is described by way of example on the basis of exemplary embodiments without restricting the general inventive concept, with express reference being made to the figures with regard to all inventive details not explained in more detail in the text. Show it:

Fig. 1

schematically a circuit for the supply of a glue application device;

Fig. 2

schematically a representation of a glue application device in longitudinal section;

Figures 3a, 3b

schematically a connection piece in a perspective representation and in a cross section

Figures 4a, 4b

schematically different views of a further connecting piece;

Figure 5a

a cross section through a further embodiment of a connecting piece;

Figures 6a, 6b

various views of the outside of a housing of a glue application member;

Fig. 7

schematically a connection coupling of a supply and discharge line for glue on a glue supply;

Figures 8a to 8d

schematically a glue circuit for supplying a glue application member of the tobacco processing industry with glue.

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

Fig. 1 shows schematically a circuit for the supply of a glue application member of the tobacco processing industry, which is arranged in a housing 4 or a glue container.

In order to supply glue from a glue supply 40 to the glue application element arranged in the housing 4, a feed pump or pressure pump 42 is connected to the glue supply 40 via a line 41. On the output side, the pressure pump 42 is connected to the input side of the housing 4 via a delivery line 43.

In order to discharge glue from the housing 4 or the glue container, the housing 4 has on its output side a connection to a discharge line 45 which is connected to a suction pump 46. Excess glue is conveyed away from the housing 4 or the glue container by means of the suction pump 46 and returned to the glue supply 40 via a connecting line 47.

The in Fig.1 The circuit shown for supplying the glue application member arranged in the housing 4 is part of an in Fig. 1 schematically designated filter attachment machine M. Under the name MAX, for example, a filter attachment machine from the applicant is known.

Based on Fig. 2 the mode of operation of a glue application device or a gluing apparatus in the tobacco processing industry is explained by way of example. Fig. 2 shows a glue application device in longitudinal section. The glue application device has an anilox roller 5 which is arranged in a housing 4 and is driven to rotate and is driven to rotate in the direction of the arrow 6 shown. The cells of the anilox roller 5 enter a glue distribution chamber 7 of a glue chamber 3 and take up the glue introduced in the glue distribution chamber 7 and emerge in the area of a scraper or squeegee 8 on the top. The cells filled with glue are then conveyed to a glue application zone 9 while the roller 5 rotates through which a paper web 10 to be continuously glued is conveyed.

A corresponding glue pattern is applied to the underside of the paper web 10 by taking up glue from the cells of the anilox roller 5. For safe guidance of the paper web 10 in the area of the glue application zone 9, guide rods 11 or guide rollers are provided on the top. In a further embodiment, it is conceivable that the screen roller 5 interacts with a counter roller in the region of the glue application zone 9 in order to apply a corresponding glue pattern to the underside of the paper web 10. After glue has been removed from the cells of the anilox roller 5, the cells are rotated back to the glue distribution chamber 7.

The glue distribution chamber 7 is glue via the external conveying line 43 (cf. Fig. 1 ) and an internal supply line 13 of the glue distribution chamber 7. For this purpose, the feed line 43 is connected on the inlet side to the feed pump 42 (cf. Fig. 1 ) connected so that glue is conveyed into the supply line 13 from an external glue supply via the external conveying line 43.

How out Fig. 2 Furthermore, it can be seen that the glue chamber 3 is pressed against the surface of the anilox roller 5 via a pressure device 22 arranged on the rear side of the glue chamber 3. The pressing device 22 can be formed in one embodiment by means of springs or compressed air cylinders or the like.

The glue that is not used in the glue chamber 3 is removed from the glue chamber 3 and collected in the glue container or in the housing 4 on the underside of the housing. The glue 20 collected in a glue sump is in the housing 4 by means of a suction pipe 26 which is connected to the discharge line 45 (cf. Fig. 1 ) is connected, drained. Here, a negative pressure generated by the suction pump 46 via the discharge line 45 (cf. Fig. 1 ) and placed the suction tube 26 immersed in the glue 20 so that the glue 20 collected on the housing bottom is removed from the interior of the housing.

An ultrasonic sensor 21 is also arranged on the upper side in the interior of the housing above the glue 20 or above the housing bottom, so that the level of the glue 20 collected in the housing 4 is detected by means of the ultrasonic sensor 21. The ultrasonic measurement signal of the ultrasonic sensor 21 is directed vertically downwards onto the free surface of the glue 20, so that the level of the glue in the housing 4 is detected by means of the ultrasonic sensor 21, whereby the collected glue 20 is sucked in by the suction pump 46 at a predetermined glue level (see. Fig. 1 ) via the suction pipe 26 and the discharge line 45 (cf. Fig. 1 ) Will get removed.

A straight guide channel 27 is located below the ultrasonic sensor 21 arranged, are coupled into the ultrasonic measurement signals of the ultrasonic sensor 21 on the upper or upper entry side and are guided or guided through the guide channel 27 to the lower exit side. The ultrasonic measurement signals on the exit side of the guide channel 27 are directed vertically downwards onto the free surface of the glue 20 or onto the housing base. In an embodiment not shown here, the guide channel 27 can also have curves or arcs, the ultrasonic measurement signals being directed downwards onto the glue 20 on the exit side of a guide channel provided with bends or arcs. This makes it possible to provide the sensor at any desired or preferred location on the housing, with the ultrasonic measurement signals from the sensor being passed through the guide channel, which is preferably closed at the side.

In the Figures 3a, 3b various views of a connecting piece 51 are shown. Fig. 3a shows schematically a perspective view of the connecting piece 51, while in Figure 3b a cross section through the connecting piece 51 is shown. The connecting piece 51 has a shaft-like insertion side 52 and an outer ring 54 and a connection head 53 facing away from the insertion side 52, the insertion side 52 being attached to the housing outer wall of a housing 4 (cf. Fig. 1 , Fig. 2 ) of a gluing apparatus is introduced into a bore or the like, so that the connecting head area 53 with the conveying line 43 or 45 (cf. Fig. 1 ) can be connected. The connection head 53 protrudes from the housing. The connecting head 53 is circular and has a kidney-shaped passage area 54 through which glue is conveyed.

In Figure 3b a cross section through the connecting piece 51 is shown. How out Figure 3b As can be seen, the insertion side 52 is hollow or hollow-cylindrical on the inside, the insertion side 52 having a constant inside diameter over the entire length. The passage area 54 is narrowed in relation to the inner cross-sectional area of the insertion side 52, the passage area 54 being formed with a predetermined inclination with respect to the hollow cylindrical conveying area of the insertion side 52.

The narrowing of the flow cross-section and the ramp-like increase in the passage area 54 ensure that when the connection head 54 is separated from a conveying line, e.g. when the glue application element with the housing 4 is dismantled from the machine, glue does not come out of the area due to the ramp-like design of the passage area 54 Connection stub 51 can emerge, since due to the rising passage area 54, the glue cannot pass over the outer edge of the passage area.

In this respect, the rise in the passage region 54 prevents the glue from flowing or flowing back out of the interior of the insertion side 52. In this way, a flow barrier device is formed so that when the housing with the glue application element is separated from a conveying line using an in Figures 3a and 3b Connection piece shown little or no glue can escape from the connection piece.

In Figures 4a and 4b a further connection piece 61 is shown, which also prevents a flow or back flow of glue. The one in the Figures 4a and 4b Connection piece 61 shown also has an insertion side 62 and an outer ring 65 and a likewise tubular connection head 63. On the On the outside of the connection head 63, a circular locking disk 66 made of rubber or another elastic material is arranged inside, the locking disk 66 having slots 67 which are arranged in a star-like manner to one another.

If the connection head 63 is connected to a conveying line for conveying in or conveying away glue from a housing, and if glue is conveyed in one direction through the connecting piece 61 with the application of a conveying pressure or a suction pressure, the pie-like parts formed by the slots 67 are Locking disk 66 pushed away from each other or pushed apart, so that glue passes through locking disk 66.

If no glue is conveyed, the elastic pie-like disc parts of the locking disc 67 move back into their original rest position, so that glue does not escape to the outside from the interior of the connecting piece 66. In the rest position, a locking effect of the locking disk 66 is achieved, whereby a flow or backflow of glue from the interior of the connecting piece 61 is prevented.

Fig. 5 shows in cross section a connecting piece 71 which is designed in the manner of an automatic shut-off valve. For this purpose, the connecting piece 71 has in the interior a compression spring 73 mounted on one side, by means of which a ball 74 arranged on the other side of the spring is pressed against the other narrowed outlet of the connecting piece 71. If the connecting piece 71 is pulled off a conveying line, the ball 74 closes the right opening of the connecting area due to the application of the spring force by the spring 73, whereby by closing the opening a flow or backflow of glue in the connecting body 71 from the right opening of the connecting piece 71 is prevented.

In order to open the shut-off valve in the connecting piece 71, the correspondingly connected area of a delivery line has a pin or the like to press the ball in the connecting piece 71 inwards, whereby the passage opening in the right area is opened and glue is conveyed through the connecting piece 71 can.

Using the in Figures 3a, 3b as well as 4a, 4b and Fig. 5 Connection pieces 51, 61 and 71 shown, a flow or backflow of glue from the connection piece when the delivery pressure is not applied or when dismantling the delivery lines prevents the flow or backflow of glue out of the connection piece. If the connecting pieces 51, 61 and 71 are arranged with their plug-in sides on the housing outer walls of a housing for a glue application element, this prevents glue from escaping from the housing or from the connecting piece when a glue application device is dismantled from a machine of the tobacco processing industry, whereby clean handling of the gluing apparatus results.

In Figures 6a and 6b are shown in further embodiments perspective views of a housing outer wall of a gluing apparatus, with collecting containers below the connection points 81, 82 for the conveying lines for conveying and for conveying glue into the housing 4 and out of the housing 4 are arranged. A collecting container 83 is arranged below the connections 81, 82, so that when a gluing apparatus is dismantled from the connections 81, 82, any glue that drips out is collected by the collecting container 83, whereby the assembly point on the machine of the tobacco processing industry is kept clean of glue becomes.

The in Figure 6b The embodiment shown is shown on the housing wall below the connections 81 in each case a collecting container 84, 85 in order to catch glue emerging from the housing 4 at the connection points 81, 82 for the conveyor lines when the gluing apparatus is dismantled.

In Fig. 7 a glue supply 91, for example in the form of a bag or the like, is shown schematically. The glue supply 91 has a removal point 92 on the lower side, at which glue is removed from the glue supply 91 at the same time and at the same time glue is taken via the connecting line 47 (cf. Fig. 1 ) Glue is returned from a housing of a glue application member into the glue supply 91. For this purpose, the connection line 47 is connected to a connection head 94 via a connection 93.

The connection head 94 is firmly connected to the glue supply 91 at a corresponding opening in the glue supply 91. Inside the glue supply 91, the connection head 94 has a riser pipe 95 which, in the area of the connection area with the conveying line 47, has holes or openings 97 in the lower area, so that the glue conveyed back by a glue application element through the openings 97 into the interior of the riser pipe 95 passes through, and the glue, which may have air bubbles or air inclusions, is conveyed upwards in the interior of the riser pipe 95, whereby the air bubbles are separated from the glue. The degassed glue emerges at the upper end of the riser pipe 95 and flows to the quantity of glue present in the glue supply 91, which is provided with the reference number 96.

The riser pipe 95 protrudes into the glue supply 91 and is in the area the removal point 92 in the lower area of the glue supply 91 is surrounded by a nozzle 98, whereby between the outer wall of the riser pipe 95 and the inner wall of the nozzle 98 glue can flow down to the removal point 92, since the outer wall of the riser pipe 95 and the inner wall of the nozzle 97 separate from each other are spaced. By applying a negative pressure to the conveying line 41, glue is conveyed away from the glue supply 91 via a connection 89 connected to the connecting head 94.

In order to reliably separate the return of glue from the housing 4 of the glue application element into the glue supply 91 and the removal of glue from the glue supply 91, the connection head 94 has a seal 88 which is arranged outside the glue supply 91 on the riser 95, see above that glue can be removed from the glue supply via the conveying line 41.

In the Figures 8a to 8d are various schematic representations of a glue circuit for the supply of a glue application member arranged in the housing 4, with which strips of material from the tobacco processing industry, in particular paper webs, are provided with glue or with a glue pattern. In the Figures 8a to 8d different operating modes are shown.

The supply line for glue into the housing 4 or to the glue application element in the housing 4 has two controllable valves 111, 112. The discharge line 45 leading back to the glue supply 40 also has two valves 113, 114 arranged in series. Between the supply line 43 and the Discharge line 45 is formed between the valves 111 and 112 and between the valves 113 and 114 of the discharge line 115, a further connection line 120, wherein in the connection line 120 a valve 121, in particular control valve is arranged. Depending on the switching of the valves 111, 112, 113, 114, 121 and the operation of the feed pump 42 and the suction pump 46, different operating modes are possible.

In Figure 8a the operating situation is shown in which the gluing apparatus with the housing 4 is mounted or used on the machine, for this purpose the housing 4 is filled with glue on the suction side until a level sensor detects a predetermined glue level in the housing 4, so that the Feed pump 42 is switched off. Here, the valve 112 and 113 is in the blocking position, the valves 111, 121 and 114 being switched to the open position, so that when the feed pump 42 is switched on, glue is conveyed from the glue supply 40 into the housing 4 until a corresponding glue level is reached in the housing.

The production situation is in Figure 8b shown schematically. Here, the valves 111, 112 in the supply line 43 are switched to the open position. Likewise, the valves 113, 114 in the discharge line 45 are also switched to the open position. The valve 121 is in the blocking position, so that no glue is conveyed from the feed pump 42 to the discharge line 45. When the feed pump 42 is switched on, glue is conveyed from the glue supply 40 into the housing 4 or to the glue application element, so that glue images are applied to a material web, in particular a paper web, by means of the glue application element, in order to glue covering paper sheets, for example on a filter attachment machine. The unused glue is pumped out of the housing 4 via the discharge line with the valves 113, 114 switched to the passage and the suction pump 46 switched on, back into the glue supply 40.

Should the gluing device be removed from the Are removed from the machine, the facilities are Figure 8c mode shown. Here, glue is first conveyed away in the supply line 43 and glue on the pressure side from the glue application element. For this purpose, the pressure pump 42 is switched off while the suction pump 46 is switched on. The valves 111 and 114 are in the blocking position so that when the valves 112, 121 and 113 are switched on, ie switched to the open position, glue is fed back from the pressure side of the gluing apparatus from the housing 4 into the glue supply 40.

When removing the gluing apparatus (cf. Figure 8d ) with the housing 4, ie when the housing 4 is removed from the machine, the pressure pump 42 is switched off and the valves 111, 112 and 121 are switched to the blocking position. When the valves 113, 114 are open and the suction pump 46 is switched on, glue is fed back from the suction side of the housing 4 into the glue supply, with the suction pump 46 in particular being switched on for a predetermined period of time in order to remove a corresponding predetermined amount of glue from the housing 4.

The suction pump 46 is then switched off and the valves 113, 114 switched to the blocking position, so that the covering apparatus with its housing 4 can be separated from the lines 43 and 45, and an almost glue-free gluing apparatus, that is, there is little glue in the housing 4, can be dismantled from the machine.

All of the features mentioned, including those that can be taken from the drawings alone and also individual features that are disclosed in combination with other features, are considered to be essential to the invention alone and in combination. Embodiments according to the invention can be fulfilled by individual features or a combination of several features.

Reference list

3

Glue chamber

4th

casing

5

Anilox roller

6th

arrow

7th

Glue distribution chamber

8th

Squeegee

9

Glue application zone

10

Paper web

11

Guide rod

13

supply line

20th

glue

21st

Ultrasonic sensor

22nd

Pressing device

26th

Suction pipe

27

Guide channel

40

Glue supply

41

management

42

Pressure pump

43

Delivery line

45

Delivery line

46

Suction pump

47

Delivery line

51

Connecting piece

52

Insertion side

53

Connection head

54

Passage area

55

ring

61

Connecting piece

62

Insertion side

63

Connection head

65

ring

66

Lock washer

67

slot

71

Connecting piece

81

connection

82

connection

83

Collecting container

84

Collecting container

85

Collecting container

88

poetry

89

connection

91

Glue supply

92

Tapping point

93

connection

94

Connection head

95

Riser pipe

96

glue

97

Breakthrough

98

Support

111

Valve

112

Valve

113

Valve

114

Valve

120

Connecting line

121

Valve

M.

Filter attachment machine

Claims (6)

1. A device for applying glue to a strip of material (9) for the tobacco processing industry, comprising a glue applicator (5), in applicator an anilox roll (5), arranged in a housing (4), wherein glue has been or is conveyed out of the housing (4) by means of a discharge line (45) connected to the housing (4), wherein the discharge line (45) is connected to a glue supply, wherein the discharge line (45) is designed having an air separation device, preferably arranged in the glue supply, in order to remove from the glue air bubbles contained in the glue conveyed away, characterized in that the air separation device is arranged in the glue supply as a rising pipe (95), such that the glue flowing back in the discharge line (45) is guided into the glue supply through the rising pipe (95).
2. The device according to claim 1, characterized in that a glue withdrawal point that is connected to the feed line (43) for feeding glue to the glue applicator (5) is provided outside the rising pipe (95) in the lower region of the rising pipe (95) and in the region of the connection of the discharge line (45) to the glue supply.
3. The device according to claim 1 or 2, characterized in that the rising pipe (95) comprises openings (97) in the lower region, such that the glue conveyed back from a glue applicator passes through the openings (97) into the interior of the rising pipe (95).
4. The device according to any one of claims 1 to 3, characterized in that the rising pipe (95) projects into the glue supply and is surrounded by a pipe socket (98) in the lower region of the glue supply in the region of the withdrawal point (92), wherein glue can flow downwards to the withdrawal point (92) between the outer wall of the rising pipe (95) and the inner wall of the pipe socket (98), wherein the outer wall of the rising pipe (95) and the inner wall of the pipe socket (97) are spaced apart from one another.
5. The device according to any one of claims 1 to 4, characterized in that glue has been or is conveyed to the housing (4) or glue applicator (5) by means of a feed line (43) connected to the housing (4).
6. A machine for the tobacco processing industry, in particular a filter assembler, comprising a device for applying glue to a strip of material for the tobacco processing industry according to any one of claims 1 to 5.

Images