EP1842814B1 - Device for replacing a first material web by a second material web - Google Patents

Abstract

The apparatus has supports displaceable in a direction parallel to each other between an outer reload position and an inner supply position. A set of shafts (6, 8) on the supports extends parallel to the direction and is adapted to carry rolls (1, 2) of a material strip (3). A feeder unit pulls off the strip of one of the rolls in the supply position of the respective support. A cutter (10) on each of the supports cuts the respective strip, and a glue joiner (11) on each of the supports glues a leading end of the respective strip. A direct-current motor is provided for driving a feed roller.

Description

The invention relates to a device for replacing a material web arranged on a work roll by a further material web provided on a standby roll, having a first, a first tensioning shaft for the splice unit having a roller and a second splicing unit having a second tensioning shaft for the second roller.

Such devices are used in practice, when the material to be processed in a machine wound on large supply rolls is provided, of which continuously or clocked the material is withdrawn as a running web or as packaging material, usually as a film web for the goods.

Application examples can be found in the textile industry, in printing presses and in particular in the packaging industry, which has to meet high demands on purity and faultlessness in the packaging of pharmaceutical products. Furthermore, due to the finite length of the material web provided on the supply roll, an exchange of the supply roll is required on a regular basis, which results in a casual distinction between the work roll currently active in the production process and the standby roll held ready as a reserve. In the EP 167 917 The disclosed device is considered to be the closest prior art.

The invention has for its object to make the regularly carried out measures of change between the work role and the readiness role for the user as simple as possible.

This object is achieved according to the invention in a device of the type mentioned in that for the preparation of Splicevorganges all splice units is slidably mounted in the defined by the axis of the associated tensioning waves direction, and that each of the splicing units comprises a cutting unit and a bonding table.

This inventive design results in several advantages. On the one hand, of course, the accessibility to the two splicing units is improved, which alternately carry the work roll and the standby roll; on the other hand, if the work role has been wound up and needs to be replaced by a new stand-by role, the user can make the necessary manipulations in one to the current one Run web offset layer, so that production disturbances in the running web are avoided by the user. The assignment of the cutting unit and the bonding table to the two splicing units also ensures that the material web provided on the ready roll can assume a precisely defined initial state and initial position at its free end.

For this purpose, it is advisable that in the cutting unit, a counter knife and a pressure medium-operated adjustable cutting blade are arranged, between which the material web runs. Furthermore, it is favorable if the cutting unit for fixing the material web comprises a fixing unit, so that the position of the material web is reliably fixed before, during and after cutting.

By means of a simple construction, this is achieved by the fixing unit is associated with a vacuum suction. Furthermore, a pressure-medium-operated adjustable clamping plate is arranged in the fixing unit. This clamping plate lends itself to a large-area clamping of the material web, while the vacuum suction device is preferably kept ready for the free end of the material web.

In order to achieve an orderly timing in the connection of the two webs, the adhesive table is associated with a pressure medium actuated adjustable pinch roller, which forces a distance of a material web to the other web and prevents premature bonding.

In order to enable a simple transfer of the material web from the cutting unit to the bonding table and to securely and precisely fix the position of the material web on the bonding table, at least one vacuum suction device for the material web is associated with the bonding table, wherein the bonding table furthermore has suction channels for a material web Having to be fixed adhesive tape.

In order to facilitate the change of the unwound work role and their replacement by a new standby role, the arrangement is such that the tension shafts in their circumferential direction pressure medium operable blades for tensioning the associated role and a disc brake with electronically pressure control.

With the above-described device, it is possible to finally prepare the operation of connecting the two webs of material to the work roll and the standby roll by a user. However, the time must still be determined when the splicing process itself is to be executed. For this purpose, the design is such that in each splice unit, a sensor for detecting the web end of the associated role is provided, wherein the sensor is designed as an inductive sensor for detecting the rotational speed of the clamping shaft.

Since preferably during the splicing process itself the production process should not be stopped, the material web must continue to be made available from a supply to the production process. For this purpose, it is provided that the material web on the work roll by a between a working position and a Splicestellung pivotable pendulum is guided.

To compensate for tolerances, the design is such that the bonding table is resiliently mounted.

In addition, that a, in particular rubberized feed roller for advancing the material web is provided, which is active for normal operation, between two Splicevorgängen and also can be used for flat rolling the splice point on a counter-roller.

It makes sense that for the drive of the feed roller, a DC motor is provided, which is associated with a transmission.

For the precise further transport of the cut material web, a pneumatic drive with an electromagnetic clutch is provided.

Alternatively, there is also the possibility that a servomotor is provided for the drive of the rubberized feed roller and the further transport of the cut material web. This servo replaces the task of the DC motor described under point 14 at the same time.

Fig. 1

die schematische Darstellung einer Vorderansicht der erfindungsgemäßen Vorrichtung mit den beiden spiegelbildlich aufgebauten Spliceeinheiten,

Fig. 2

eine isolierte, perspektivische Darstellung der in Figur 1 linken Spliceeinheiten in ihrer herausgezogenen Stellung,

Fig. 3

einen Längsschnitt IV-IV durch die Schneideinheit und den Klebetisch aus Figur 2,

Fig. 4A-4D

die einzelnen Verfahrensschritte zum Vorbereiten des Splicevorganges an der Schneideinheit,

Fig. 5A

eine der Figur 1 entsprechende Darstellung zur Kennzeichnung des Details in den Figuren 5B bis 5D,

Fig. 5B-5D

die Darstellung der Abfolge der Klebetischstellungen während des Splicevorganges, und

Fig. 6

eine perspektivische, schematische Darstellung der Vorschubeinheit zum Transport des beim Spicevorganges abgeschnittenen Folienendes mittels einer gummierten Vorschubwalze und einer Gegenrolle.

In Figur 1 ist eine Vorrichtung gezeigt, die zum Ersetzen einer auf einer Arbeitsrolle 1 angeordneten Materialbahn 3 durch eine auf eine Bereitschaftsrolle 2 bereitgestellten weiteren Materialbahn 3 dient. Die Bezeichnung Arbeitsrolle 1 ist dabei gewählt, da von dieser Arbeitsrolle 1 die Materialbahn 3 für den Produktionsprozess abgezogen und durch ein zwischen einer Arbeitsstellung und einer Splicestellung verschwenkbaren Pendel 4 der weiteren Verarbeitung zugeführt wird, während die Bereitschaftsrolle 2 als Reserve bereitgehalten wird, wenn die Arbeitsrolle 1 abgewickelt ist. Um einen störungsfreien Produktionsprozess zu ermöglichen, muss die eine Materialbahn 3 mit der anderen Materialbahn 3 verbunden werden, so dass für den fortgesetzten Produktionsprozess die Bereitschaftsrolle 2 die Funktion der Arbeitsrolle 1 übernehmen kann. Die Bezeichnung Arbeitsrolle 1 und Bereitschaftsrolle 2 ist also funktional zu einem gegebenen Zeitpunkt zu verstehen und wechselt im Laufe des Betriebs der Vorrichtung stetig zur Benennung der einzelnen Rolle 1, 2.In the following the invention will be explained in more detail in an embodiment shown in the drawing; show it:

Fig. 1

the schematic representation of a front view of the device according to the invention with the two mirror image constructed Spliceeinheiten,

Fig. 2

an isolated, perspective view of the in FIG. 1 left splice units in their withdrawn position,

Fig. 3

a longitudinal section IV-IV through the cutting unit and the bonding table FIG. 2 .

Figs. 4A-4D

the individual method steps for preparing the splicing process on the cutting unit,

Fig. 5A

one of the FIG. 1 Corresponding illustration for marking the details in the FIGS. 5B to 5D .

Figs. 5B-5D

the representation of the sequence of adhesive setting during the Splicevorganges, and

Fig. 6

a perspective, schematic representation of the feed unit for transporting the cut off during Spicevorganges foil end by means of a rubberized feed roller and a counter-roller.

In FIG. 1 a device is shown which serves for replacing a material web 3 arranged on a work roll 1 by a further material web 3 provided on a stand-by roll 2. The term work roll 1 is chosen because of this work roll 1, the material web 3 for the Removed production process and is supplied by a pivotable between a working position and a splitting position pendulum 4 further processing, while the standby role 2 is kept ready as a reserve when the work roll 1 is unwound. In order to enable a trouble-free production process, the one material web 3 must be connected to the other material web 3, so that the standby roller 2 can take over the function of the work roll 1 for the continued production process. The term work roll 1 and standby roll 2 is thus to be understood as functional at a given point in time and constantly changes in the course of operation of the device to designate the individual roll 1, 2.

The device has a first splicing unit 5 with a first tensioning shaft 6 and a second splicing unit 7 with a second tensioning shaft 8, which in its circumferential direction druckmittelbetätigbare lamellae 9 for tensioning the associated roller 1, 2, that is the work roll 1 or the standby roll 2, as well have a disc brake with electro-pneumatic pressure control.

In preparation for the splicing process, each of the splicing units 5, 7 is displaceably mounted in the direction defined by the axis of the associated tensioning shaft 6, 8. Furthermore, each splice unit 5, 7 also has a cutting unit 10 and a resiliently mounted for tolerance compensation bonding table 11, wherein in the cutting unit 10, a counter knife 12 and a pressure medium-operated adjustable cutting blade 13 are arranged, between which the material web runs ( FIG. 3 ). In addition, the cutting unit 10 for fixing the material web 3 comprises a fixing unit 14, which is associated with a vacuum suction 15 and further comprising a pressure medium-operated adjustable clamping plate 16.

The adhesive table 11 is assigned a pressure-medium-actuated adjustable pinch roller 17 ( FIG. 4 ), which furthermore also has a vacuum suction device 18 and suction channels 19 for fixing the position of an adhesive tape 20 to be fastened to the material web 3.

In the splicing unit 5, 7, a sensor for detecting the web end of the associated roller 1, 2 is arranged, which is designed as an inductive sensor for detecting the rotational speed of the clamping shaft 6, 8.

With a device of the above construction, it is possible to carry out the splicing operation in the following manner.

The starting point is the state in FIG. 1 in which the right-hand splice unit 7, the work roll 1 is arranged, while in the left splice unit 5, the standby roller 2 is positioned. It is thus shown the state in which the previously arranged in the left splice unit 5 work roll 1 is already removed by relaxing the slats 9 of the tensioning shaft 6 and replaced by a standby roller 2 with a complete tape roll. In order to prepare the splicing operation, the user has to pull the beginning of the material web 3 of the stand-by roll 2 in the extracted splicing unit 5 to the cutting unit 10 and align it for a correct web run the user has to pay attention to a tight trajectory ( Fig. 2 ). Once the correct position of the material web 3 is reached, the fixing unit 14 is activated and then the cutting unit 10 in order to achieve a perfect, not frayed, undamaged or kinked web start ( Fig. 4A ). This web start is threaded again and clamped by the fixing unit 14 ( Fig. 4B ).

In the apparatus according to the invention, the splicing process is carried out by utilizing an adhesive tape 20, which is mounted on the material web 3 on one side from above. For this purpose, it is possible to provide the user with a marking line so that the latter can place the adhesive tape 20 in the center of the end of the material web 3 and thus of the splice point. In order to prevent hooking at the splicing point, it is recommended that the free end of the material web 3 be bevelled at an angle with the adhesive tape 20 ( Fig. 4C ). The thus prepared end of the material web 3 is withdrawn from the cutting unit 10 and pivoted by 270 ° down to the bonding table 11 and positioned ( Fig. 4D ), on which the position is secured by the vacuum suction 18 and the suction channels 19. After these actions, the preparatory activities to be performed by the user are completed, and the splicing unit 5 can be pushed back for subsequent automatic splice execution.

If the speed drop or the extension of the rotation time of the tensioning shaft 8 is detected by the inductive sensor, the loose web end of the work roll 1 in the other splicing unit 7 is detected by the fixing unit 14 clamped. The bonding table 11 of the work roll 1 carrying splice unit 7 is extended and at the same time the pinch roller 17 of the bonding table 11 from the other splicing unit 5 is operated ( Fig. 5C ); In this case, the further production process is maintained by the provided by the pendulum 4 supply of the material web 3. The cutting device 10 of the work roller 1 carrying the second splice unit 7 cuts off the material web 3 and the web end of the material web 3 from the working roll 1 bearing splice unit 7 is positioned on the bonding table 11; Subsequently, the bonding table 11 of the standby roller 2 carrying splice unit 5 extends ( Fig. 5D ), whereby the splicing process takes place. Thereafter, the vacuum applied to all the vacuum cups 18 and suction channels 19 is switched off and the fixing unit 14 is opened open the splicing unit 5. The two adhesive tables 11 are moved back and the material web 3 can be deducted from the converted into the work roll 1 standby role 2 from the first splicing unit 5 to replenish the pendulum 4 associated stock and to continue production, wherein the feed of the material web 3 during the production process by means of a rubberized feed roller 22, which is, however, also used for the flat rolling of the splice point on a counter-roller 23. For driving the feed roller 22, a DC motor is provided, which is associated with a transmission.

For the precise further transport of the cut material web 3, a pneumatic drive 21 is provided with an electromagnetic clutch.

Claims (19)

1. Device for replacing a material web (3) arranged on a working roll (1) with a further material web (3) provided on a reserve roll (2), comprising a first splicing unit (5) having a first clamp shaft (6) for one roll (1, 2) and a second splicing unit (7) having a second clamp shaft (6) for the second roll (1, 2), characterised in that in preparation for the splicing process, each of the splicing units (5, 7) is mounted so as to be displaceable in the direction defined by the axis of the associated clamp shafts (6, 8), and in that each of the splicing units (5, 7) comprises a cutting unit (10) and a gluing table (11).
2. Device according to claim 1, characterised in that a counter blade (12) and a cutting blade (13) adjustable by means of a pressure medium, between which the material web (3) extends, are arranged in the cutting unit (10).
3. Device according to either claim 1 or claim 2, characterised in that the cutting unit (10) comprises a fixing unit (14) for fixing the material web (3).
4. Device according to claim 3, characterised in that at least one vacuum suction cup (15) is associated with the fixing unit (14).
5. Device according to either claim 3 or claim 4, characterised in that a clamping plate (16) adjustable by means of a pressure medium is arranged in the fixing unit (14).
6. Device according to any one of claims 1 to 5, characterised in that a hydraulically adjustable clamping roll (17) is associated with the gluing table (11).
7. Device according to any one of claims 1 to 6, characterised in that at least one vacuum suction cup (18) for the material web (3) is associated with the clamping table (11).
8. Device according to any one of claims 1 to 7, characterised in that the gluing table (11) comprises suction channels (19) for an adhesive tape (20) which is to be fastened to the material web (3).
9. Device according to any one of claims 1 to 8, characterised in that the clamp shaft (6, 8) comprises, in the peripheral direction thereof, discs (9) actuatable by means of a pressure medium for clamping the associated roll (1, 2) and a disc brake with electropneumatic pressure control.
10. Device according to any one of claims 1 to 9, characterised in that a sensor for detecting the end of the material web on the associated roll (1, 2) is provided in each splicing unit (5, 7).
11. Device according to claim 10, characterised in that the sensor is configured as an inductive sensor for detecting the rotational speed of the clamp shaft (6, 8).
12. Device according to any one of claims 1 to 11, characterised in that the material web (3) on the working roll (1) is guided by a pendulum (4) which is pivotable between a working position and a splicing position.
13. Device according to any one of claims 1 to 12, characterised in that the gluing table (11) is mounted resiliently.
14. Device according to any one of claims 1 to 13, characterised in that a feed roll (22) is provided for feeding the material web (3).
15. Device according to claim 14, characterised in that the feed roll (22) is provided for rolling the splicing location flat against a counter roll (23).
16. Device according to any one of claims 1 to 15, characterised in that a DC motor is provided for driving the feed roll (22).
17. Device according to claim 16, characterised in that a transmission is associated with the DC motor.
18. Device according to any one of claims 1 to 17, characterised in that a pneumatic drive (21) with an electromagnetic coupling is provided for the precise continued transport of the cut-off material web (3), in order to produce a flush join between the two material webs (3).
19. Device according to any one of claims 1 to 17, characterised in that a servo motor is provided for the precise continued transport of the cut-off material web (3).

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