EP0653983B1 - Process and device for making substantially cylindrical cardboard tubes closed at one end - Google Patents

Abstract

The invention relates to a process and device for making substantially cylindrical cardboard tubes, especially of wound cardboard, closed at one end. A revolving transfer machine (40) used to make these cardboard tubes has a rotary conveyor plate (41) and ten processing positions (I-X). Around, above and partly beneath the rotary conveyor (41) there are processing devices, e.g. a prepressing and presealing device (2), a sealing and rounding device (3), a smoothing device (4), a printer (5), a turning device (6), a gluing device (7) and a pre-bordering and post-bordering device (8 and 9) at distances corresponding to the angular distances between the stations (I-X). The cardboard tubes are vertically fed to the revolving transfer machine (40) in predetermined lengths and diameters via a supply device (1). The finished cardboard tubes are removed from the revolving tranfer machine by an ejector device (10). A stored-program control device (11) controls the entire production cycle.

Description

The invention relates to cardboard forming technology and relates to a method and a device for producing essentially cylindrical cardboard sleeves which are closed on one side, in particular from cardboard.

DE-U-9 201 538 discloses an essentially cylindrical sleeve made of cardboard which is closed on one side and has a stepped, conical, airtightly crimped end. A method and a device for producing such a sleeve is not described. It is only mentioned that such a design of the sleeve can be realized “only with a great deal of effort” without giving any further details on the method.

In the known use of such cylindrical cardboard sleeves closed on one side as attachment sleeves for fireworks rockets, in which these attachment sleeves are each attached to a further sleeve serving as a propellant charge, there is a demand for an inexpensive and simple manufacturing method and a manufacturing device which make it possible to close the closed end to make it as tight as possible. Furthermore, the cardboard sleeve should be made in one piece.

• a) Herstellung von zylindrischen Hülsen mit vorbestimmtem Durchmesser und vorbestimmter Länge,
• b) konisches Zusammenpressen der Hülsenwand an einem Ende der Hülse und
• c) Verdichtung des verpreßten Hülsenendes und kuppenartiges Abrunden der verdichteten Hülsenspitze, so daß letztere eine formstabile Kuppe bildet.

To achieve this object, the manufacturing method according to the invention is characterized by at least the following steps:

• a) production of cylindrical sleeves with a predetermined diameter and a predetermined length,
• b) conically pressing the sleeve wall at one end of the sleeve and
• c) compression of the pressed sleeve end and dome-like rounding of the compressed sleeve tip, so that the latter forms a dimensionally stable tip.

As a result of the marked process steps, a substantially cylindrical cardboard tube, in particular made of cardboard, is closed, the closed tip of which remains dimensionally stable and tight even when the cardboard tube contains an explosion of fireworks effect material, so that the fireworks discharge emerges from the open tube end. Furthermore, the advantage is achieved that the closed sleeve end is relatively tight against atmospheric moisture.

According to a preferred embodiment, the pressing step b has a further step b1, through which the cardboard material is already pre-compressed during the conical pressing together. A smoothing of the inner and outer walls in the region of the compressed sleeve end is preferably carried out by a further step d after step c.

Overall, the manufacturing method according to the invention is preferably characterized in that the cardboard material in steps b, b1, c and d is pressed, compressed and smoothed between an axially movable pressure stamp inside the sleeve and an outer bell acting counter to the stamping force, the The pressure stamp and the bell each have an outer and inner contour that corresponds to the intended compression, compression and smoothing.

The path of the pressure stamp is preferably adjustable given, and the bell is axially resilient, the travel determines the pressure.

In the compression step c, the dome-like rounding is preferably carried out by an anvil arranged immovably axially within the bell, against the concave anvil surface of which the stamp presses the compressed sleeve end.

In the preferred use of the cardboard sleeves produced according to the invention as attachment sleeves for fireworks rockets, these sleeves are already provided with an external label during the sleeve production step a.

In this case, the smoothing step d is preferably followed by a printing step e, through which a desired printing ink is printed on the outside of the smoothed sleeve tip.

A further increased tightness of the shaped sleeve tip is preferably achieved by a gluing step f, through which glue is introduced into the sleeve interior in the area of the sleeve tip.

In order to achieve a tight and secure fit of the sleeve according to the invention on a cardboard tube serving as a propellant charge of a fireworks rocket, the edge of the open sleeve side is preferably flared inwards in a flaring step g.

This flanging step g is advantageously carried out in two sub-steps, namely a pre-flanging script g1, in which the edge is simply bent inwards, and a post-flanging step b2, in which the edge which has already been pre-flanged is further spiraled inwards.

Production steps a - e are preferably carried out with the sleeve tip upright, that is to say with the sleeve tip protruding upwards, and steps f and g with the sleeve reversed, the sleeve tip being at the bottom. The sleeve is turned by a sleeve turning step between steps e and f.

A device according to the invention for producing an essentially cylindrical cardboard sleeve made of cardboard is sealed by
a winding device for winding a cylindrical tube with a predetermined diameter from a cardboard strip,
a cutting device in which the tube is cut into sleeves of a predetermined length,
a pre-pressing device in which the sleeve standing on an axially movable pressure stamp is conically pressed at one end by an outer bell acting counter to the pressure movement of the pressure stamp, the pressure punch and the bell each having an outer or inner contour corresponding to the conical pressing, and a compression and rounding device, which likewise has a pressure ram protruding into the sleeve and a bell surrounding the sleeve at its tip with an outer or inner contour corresponding to the intended compression and rounding, as well as an anvil counteracting the punch tip, and which has a dimensionally stable crest forms on the sleeve.

To achieve the smoothest possible outer surface in the area of the sleeve tip, a smoothing device is preferably provided which smoothes the inner and outer wall in the area of the compressed and rounded sleeve end.

The smoothing device preferably also has a pressure stamp that pushes into the interior of the sleeve and a bell that counteracts the pressure stamp.

If printing from the outside of the sleeve tip is required, a printing device is preferably also provided, which applies printing ink to the outside of the smoothed sleeve tip. This printing device is preferably designed as a pad printing device. For further compression of the sleeve tip, a gluing device is provided, which introduces glue into the sleeve interior in the area of the sleeve tip. The glue is preferably a fast-drying hot glue. According to a preferred development, an edge crimping device is also provided, which crimps the edge of the open sleeve side inwards.

In a preferred further development, the edge flanging device is designed in the form of a pre-flanging and a post-flanging station, the pre-flanging station simply bending the sleeve edge inwards and the post-flanging station further spiraling the sleeve edge inwards.

The production devices are preferred, starting with the pre-pressing device in the form of a rotary transfer machine, with a rotatable rotary conveyor table which has a predetermined number of receiving stations arranged in a circle for the cardboard sleeves and with Workstations arranged above and partially below the rotary conveyor table in accordance with the angular distances of the receiving stations, of which the first station has a feed device for the correct feeding of sleeves of predetermined diameter and predetermined length in a vertical position, the second to fourth stations each have the pre-pressing device, the compression device and rounding device and the smoothing device; the fifth station the printing device; the sixth station a turning device; the seventh station the gluing device; the eighth and ninth stations include the pre-crimping and post-crimping devices, and the tenth station includes an ejection device for ejecting the sleeves produced.

A programmable logic controller (PLC) is preferably used to control the rotary transfer machine, the latter receiving signals from various sensors on the rotary transfer machine and outputting control signals to the production devices.

The rotary transfer machine is preferably designed so that the stamp of each of the stations engages from below the rotary feed table into the interior of the sleeves while the bells and the anvil press onto the sleeve tip from above the rotary feed table.

The turning device has the function of turning the sleeves in the reverse position, in which the sleeve opening is turned up and the sleeve tip is turned down.

According to a particularly advantageous development, the rotary transfer machine preferred according to the invention is designed in such a way that the pre-pressing device is the compression and rounding device and the smoothing device are provided in a common machine stand, a predetermined number of plate springs are provided in axial position between this machine stand on the one hand and the bells of the pre-pressing device, the compression and rounding device and the smoothing device on the other hand, which spring force against each in the Exercise the bell-pushing plunger so that the respective spring travel determines the pressing pressure exerted on the sleeve.

The anvil of the compression and rounding device is preferably mounted unsprung on the machine stand.

In the preferred embodiment of the rotary transfer machine, the punches engaging the inside of the sleeve from below perform an axial pressing movement, while the bells used as a die are immovable apart from the spring travel and the anvil.

Of course, in a kinematic reversal of this process, an axial pressing movement of the machine parts carrying the anvil and the bells can also be carried out with a stationary or only spring-mounted stamp. Furthermore, a combination of both types of movement, in which both the stamp and the respective machine part carrying the anvil and the bells are moved, can be achieved without departing from the essence of the invention.

The preferred embodiment has ten processing stations I-X, including the tube feeder and the tube ejection device.

However, this number is only to be understood as an example.

Of course, such a rotary transfer machine can also have more or fewer processing stations, depending on the type of processing required.

For example, a labeling station can be switched between the smoothing station IV and the printing station V. Between the individual processing stations, additional stations can be used as required, e.g. B. test stations are used, one of which, for. B. pneumatically checks the tightness of the compressed sleeve tip after the gluing step.

The aforementioned press movement of the punch and / or the bells and the anvil, the pressure device and the flanging device can be driven mechanically as well as hydraulically, pneumatically or by a combination of these types of drive.

Fig. 1

schematisch eine Draufsicht auf eine zur Herstellung der erfindungsgemäßen Pappehülsen bevorzugt verwendeten Rundtaktmaschine mit den Bearbeitungsstationen I - X;

Fig. 2

eine Darstellung der in den einzelnen Bearbeitungsstationen I - X vorliegenden Hülsenformen;

Fig. 3A

jeweils in der Vorpreßvorrichtung, der Verdichtungs- und

3B

Abrundungsvorrichtung und der Glättungsvorrichtung zum 3C

3C

Einsatz kommende Werkzeuge;

Fig. 4

einen bei der Vorpreßvorrichtung, der Verdichtungs- und der Abrundungsvorrichtung und der Glättungsvorrichtung eingesetzten Druckstempel;

Fig. 5

einen Längsquerschnitt durch die mit dem Herstellungsverfahren fertiggestellte Hülse in ihrer bevorzugten Verwendungsart.

Further features and advantages are described in more detail below using a preferred embodiment of the manufacturing method according to the invention and the manufacturing device with reference to the drawings. Show it:

Fig. 1

schematically shows a plan view of a rotary transfer machine with the processing stations I - X, which is preferably used for producing the cardboard tubes according to the invention;

Fig. 2

a representation of the sleeve shapes present in the individual processing stations I - X;

Figure 3A

each in the pre-pressing device, the compression and

3B

Rounding device and the smoothing device to 3C

3C

Tools to be used;

Fig. 4

a plunger used in the pre-pressing device, the compacting and rounding device and the smoothing device;

Fig. 5

a longitudinal cross section through the sleeve finished with the manufacturing process in its preferred mode of use.

In the rotary transfer machine shown in FIG. 1, which is designated generally by 40, ten stations I-X arranged in a circle are provided on a rotary conveyor table 41, each of which accommodates a cardboard tube in the various processing stations. The processing stations are also identified with Roman numerals I - X. The individual machining devices, which are designated by Arabic reference numerals 1-10, are arranged around and above and partially below the rotary conveyor table 41. It is assumed, for example, that the rotary feed table 41 rotates counterclockwise. The first station I has a feed device 1, through which the sleeves are fed in the correct diameter and predetermined length in the correct position and transferred to the receiving station I. The sleeve blanks can be provided with an external label.

The processing station II has a pre-pressing and pre-compression device 2, by means of which the sleeve blanks turned further to the station II receive a conically tapering but still open tip.

By the described below with reference to Figures 3A and 4 In addition to the conical shape of the tip, the arrangement of the pressure stamp and bell pre-compresses the cardboard material in the area of this tip. The pressure stamp carries out a pressing movement from bottom to top against the bell which is spring-mounted on the machine stand 20.

The pre-pressed and pre-compressed cardboard tube is transferred to the processing station III, which uses a compression and rounding device 3 to carry out further compression and dome-like rounding of the tube tip. The tool used in the compression and rounding device 3 is explained in more detail below with reference to FIGS. 3B and 4. Here, too, a pressure stamp carries out a pressing movement into the interior of the sleeve against a bell which is resiliently mounted on the machine stand 20 and which extends over the outside of the cardboard sleeve in the region of the sleeve tip. Furthermore, an anvil with a concave anvil surface, immovably fastened to the machine stand 20, is provided, which is used for the rounded tip of the sleeve tip.

The sleeve, which has been compressed and rounded in the area of its tip in the compression and rounding device, is then transferred to the processing station IV, where a smoothing device 4, also equipped with a pressure stamp and a bell, is provided.

A common machine stand 20 is preferably used for the machining devices II-IV.

The sleeve thus provided with a smoothed and compressed dome-like tip is conveyed to the processing station V, where the sleeve tip by means of a printing device 5 is printed with printing ink. The printing device 5 is preferably a pad printer. No actual machining of the sleeve takes place in the following station VI. This is only turned into its reverse position, with its tip pointing downwards, by means of a turning device 6.

In a further processing station VII, a gluing device 7 is provided, which introduces a quick-drying hot glue into the interior of the sleeve in the area of its tip, which further increases the tightness of the sleeve tip. The subsequent processing station VIII contains a pre-flanging device 8 which simply flanges the edge of the open sleeve side. In the subsequent processing station IX, the edge is flanged further by means of a re-flanging device 9, so that it folds spirally inwards. Finally, a further processing station X is provided with an ejection device 10 which effects the ejection of the finished sleeve.

The entire rotary transfer machine 40 is controlled by a programmable logic controller (PLC) 11, which receives sensor signals from various sensors attached to the individual processing stations, which control the correct functioning of the processing devices. The PLC sends control signals to the individual processing devices I - X, so that a smooth and predetermined workflow of the rotary transfer machine is guaranteed.

The sleeves present in the individual stations I - X together with the production steps are illustrated with the aid of FIG. It can be clearly seen that the complete closure, compression and smoothing of the sleeve tip achieved in the stations II - IV to an im supply essential burr-free sleeve that is completely closed in the area of its tip. The tightness is further improved after turning in station VI by gluing in station VII. The pre-flanging and post-flanging in the processing stations VIII and IX finally forms at the open sleeve end a rim suitable for preferred use as a fireworks attachment sleeve, with which the sleeve according to the invention can be plugged onto a propellant sleeve in a sealing manner.

FIG. 3A shows a tool which is preferably used in the pre-compression and pre-compression device 2 and which, in conjunction with the pressure stamp 17 shown in FIG. 4, carries out the conical deformation and the pre-compression of the sleeve tip. The inner contour 18 'of the tool part designated as bell 19 is selected in accordance with the desired conical deformation and compression of the sleeve tip and to match the outer contour 18 of the pressure stamp 17 shown in FIG. Since in the pre-compression and pre-compression device 2 the sleeve tip is not yet completely closed, the bell 19 has an axial blind hole 21 into which the cardboard material of the conically tapered sleeve tip can expand. A predetermined number of plate springs is inserted between the machine stand 20 and an outer flange of the bell, so that the spring travel determines the pressing pressure. The maximum spring travel is limited by an elongated hole 23 in the tool neck and a pin attached to the machine stand 20 and passing through the elongated hole 23.

The compression and rounding device 3 shown in FIG. 3B also has a bell 29 as a pressing tool, which has an inner contour 28 which interacts with the outer contour 18 of a pressure stamp 17 according to FIG. 2. Different 3A, however, the bell 29 is provided with an axial through hole 30 on the bottom of the inner surface of the bell 29, so that the latter can move by the pressure of the pressure stamp 17 around an anvil 31, which passes through the through hole 30 of the bell 29 with a precise fit . The pressing surface of the anvil 31 is concave and corresponds to the convex contour of the dome surface of the pressure ram 17 pressing against it.

While the bell 29 is resiliently supported in a manner similar to the bell 19 according to FIG. 3A by a given number of plate springs 32 relative to the machine stand 20, the anvil 31 is rigidly mounted on the machine stand 20. The construction shown in FIG. 3B, in conjunction with the pressure stamp 17, carries out the compression and the dome-like rounding of the sleeve tip in the processing station III. This can result in the cardboard material flowing into the very small gap between these edges in the area of the inner edge 36 of the bell 29 and the outer edge of the anvil 31, in particular when the tool is worn, which causes burr formation in the area of the sleeve tip. However, since the cardboard material has already been compressed in the pre-compression and pre-compression device 2 of the processing station II, it can no longer flow as much into the gap between the edge 36 and the peripheral edge of the anvil 31 in the compression and rounding device 3, as a result of which the formation of burrs and tool wear are minimized. However, since a certain burr formation in the area of the edge 36 cannot be ruled out due to the high contact pressure, the pressed sleeve tip is smoothed in the subsequent station IV by the smoothing device 4, so that a burr which has nevertheless arisen is smoothed.

This smoothing takes place by means of the tool shown in FIG. 3C, which likewise has a bell 38, which is supported by plate springs 35 on the machine stand 20 and which works in conjunction with a pressure stamp 17. As in FIG. 3A, the maximum path of the bell 38 is limited by an elongated hole 33 through which a pin of the machine stand 20 protrudes. The smoothing of the outer surface of the compressed sleeve tip brought about in processing station IV reduces the wear on the printing pad of the subsequent printing device 5.

1, after printing the tip in station V, the finished pressed sleeve is pushed off the stamp and turned by 180 ° with the tip pointing downwards.

After turning, the sleeve is received in a guide ring (station VI).

In stations VII and IX, in which hot glue is injected from above with a hot glue nozzle into the inside of the sleeve in the area of the sleeve tip, the sleeve is fixed from below by a counterholder and flanged inwards by a tool coming from above. This is done in two steps: At station VIII, the sleeve edge is folded tightly inwards. At station IX, this flanged edge is further rolled up spirally.

Regarding the pressure stamp 17 shown in FIG. 4, it should also be noted that the pressure path of the pressure stamp 17 is adjustable. FIG. 5 shows a cardboard sleeve 12 produced according to the invention in a longitudinal section at the top and in a plan view from below the sleeve tip 13. Shown is the glue entry 14 in the interior of the sleeve in the area of the sleeve tip 13 and the flanged edge 15 on the open side of the cardboard sleeve 12. The pre-flanging and post-flanging device 8 and 9 ensure that the flanging edge has the largest possible radius. This is important for a solid and tight assembly of the cardboard sleeve 12 serving as a container for phyrotechnical effect material on the propellant tube 16 of the firework rocket.

With the rotary indexing machine and the tools described, a cardboard sleeve which is sealed on one side and which is particularly suitable for preferred use as a top sleeve on fireworks rockets can be produced in a rational and space-saving manner. The use of a PLC control enables a very flexible rotary cycle device, which also allows subsequent changes to the production process. The cardboard sleeves produced with the described, preferred rotary transfer machine together with the described tools result in a high production yield at a high throughput rate, i. that is, there are very few unusable cardboard tubes.

Claims (24)

1. Method for the production of a largely cylindrical cardboard tube which is closed at one end and, in particular, made from wound cardboard, characterized by the following steps:

   a) producing cylindrical tubes having a predetermined diameter and predetermined length,

   b) conically pressing together the wall of the tube at one end of the tube and

   c) sealing the pressed end of the tube and rounding, in a conical fashion, the sealed tip of the tube so that the latter forms a cone having a stable shape.
2. Method according to claim 1, characterized in that step b comprises an additional step b1 with which a presealing of the cardboard material is effected during the conical pressing together of the tube wall and further comprising an additional step of

   d) smoothing the inner and outer wall in the vicinity of the sealed tube end.
3. Method according to claim 1 or 2, characterized in that the cardboard material is pressed and sealed in the steps b, b1, c and d, in each case, between an axially movable printing stamp inside the tube and an outer bell acting in opposition to the pressing force of the stamp, whereby the printing stamp and the bell have an outer and inner contour corresponding to the respective intended pressing or sealing.
4. Method according to claim 3, characterized in that the path of the printing stamp is predetermined in an adjustable fashion and the bell is mounted in an axially resilient fashion, whereby the spring path determines the pressing force.
5. Method according to claim 3 or 4, characterized in that the conical rounding in step c is carried out by an anvil arranged axially within the bell in a stationary fashion against the concave anvil surface of which a convex outer surface of the stamp presses the sealed tube end.
6. Method according to one or more of the preceeding claims, characterized in that an additional printing step e is provided for by means of which ink is applied to the outer side of the smoothed tube tip.
7. Method according to one or more of the preceeding claims, characterized in that an additional gluing step f is provided for introducing glue into the tube in the vicinity of the tube tip.
8. Method according to one or more of the preceding claims, characterized in that an additional bordering step g is provided for inwardly bordering the edge at the open side of the tube.
9. Method according to claim 8, characterized in that the bordering step g includes a prebordering step g1 and a postbordering step g2, whereby the edge is simply folded over in the inward direction during prebordering step g1 and is folded further in the inward direction in a spiraling manner during postbordering step g2.
10. Method according to one or more of the preceding claims, characterized in that the production steps a through e are carried out with the tube placed upright upon the stamp, that is to say with the tip of the tube pointing upwardly, and steps f and g or g1 and g2 respectively are carried out with the tube turned around, whereby a tube turning step is provided for between the steps e and f.
11. Method for the production of substantially cylindrical cardboard tubes (12) made from wound cardboard and closed on one end, characterized by
    a winding device for winding a cylindrical pipe of predetermined diameter from cardboard strips,
    a cutting device for cutting the pipe into a tube of predetermined length,
    a prepressing device (2) in which the tube (12), put on an axially movable printing stamp (17), is conically pressed at one end by an outer bell (19) which opposes the pressing motion of the printing stamp (17), wherein the printing stamp (17) and the bell (19) each have an outer or inner contour respectively (18, 18') corresponding to the conical pressing, and a sealing and rounding device (3) also having a printing stamp (17) projecting into the tube (12) and a bell (30) surrounding the tube at its tip (13) with outer and inner contours respectively (28) corresponding to the intended sealing and rounding, as well as an anvil (31) working in opposition to the tip of the stamp for fashioning a cone on the tip of the tube (13) having a stable shape.
12. Device according to claim 11, characterized in that a smoothing device (4) is also provided for smoothing the inner and outer wall in the vicinity of the sealed and rounded tube tip (13).
13. Device according to claim 12, characterized in that the smoothing device (4) comprises a printing stamp (17) projecting into the tube and a bell working in opposition to the printing stamp.
14. Device according to one or more of the claims 11 through 13, characterized in that a printing device (5) is furthermore provided for applying ink to the outside of the smoothed tube tip (13).
15. Device according to one or more of the claims 11 through 14, characterized in that a gluing device (7) is provided for introducing glue (14) to the inside of the tube in the vicinity of the tube tip (13).
16. Device according to claim 15, characterized in that the glue is a quick-drying hot glue.
17. Device according to one or more of the claims 11 through 16, characterized in that a edge-bordering device (8, 9) is furthermore provided for bordering the edge of the open end of the tube in the inward direction.
18. Device according to claim 17, characterized in that the edge bordering device exhibits a prebordering and a postbordering position (8, 9), wherein the prebordering position (8) simply folds the tube edge in the inward direction and the postbordering position (9) folds the edge of the tube (19) further in a spiral fashion towards the inside.
19. Device according to one or more of the claims 11 through 18, characterized by a revolving transfer machine (40) with a rotary conveyor (41) having a predetermined number of receiving positions (I - X), arranged in a circle for the cardboard tubes and having sequential processing positions (I - X) around, above, and partially below the rotary conveyor (41) corresponding to the angular separations of the receiving positions (I - X), of which the first position (I) has a supply device (1) for introducing tubes having a predetermined diameter and a predetermined length into an aligned vertical position, the second through fourth stations (II- IV) having the prepressing device (2), the sealing and rounding device (3) and the smoothing device (4) respectively; the fifth position (V) the pressing device (5); the sixth position (VI) the turning device (6); the seventh position (VII) the gluing device (7); the eighth and ninth positions (VIII, IX) the prebordering and postbordering device (8, 9) and the tenth position (X) an ejection device (10) for ejecting the produced tubes.
20. Device according to claim 19, characterized in that the transporting step of the rotary conveyor (41) and the working steps of the positions (I -X) are controlled by a memory programmable control device (SPS,11).
21. Device according to claim 19 or 20, characterized in that the stamp (17) engages the interior of the tube (12) at each of the stations (II-IV) from below the rotary conveyor (41) whereas the bells (19, 29, 38) and the anvil (31) press the tip of the tube (13) from a location above the rotary conveyor (41).
22. Device according to one or more of the claims 11 through 21, characterized in that the turning device (6) turns the tubes (12) into the opposite position at which the tube opening is turned in the upper direction and the tube tip (13) is turned in the downward direction.
23. Device according to one or more of the claims 11 through 22, characterized in that the prepressing (2), the sealing and rounding device (3) and the smoothing device (4) are provided in a common machine holder (20), wherein a predetermined number of disk springs (22, 32, 35) are provided in the axial position between this machine holder (20) and the bells (19, 29, 38) of the prepressing (2), the sealing and rounding device (3), and the smoothing device (4) which exercise a spring force in opposition to the printing stamp pressing into the respective bells (19, 29, 38) in such a fashion that the corresponding spring path determines the pressing force exercised on the tube (12).
24. Device according to one or more of the claims 11 through 23, characterized in that the anvil (31) of the sealing and rounding device (3) is mounted without spring loading on the machine holder (20).

Images