DE1247835B - Device for closing the overlapping seams of jacket blanks for paper vessels u. like - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

PATENT LETTERING

Int. CL:

Number:

File number:

Registration date:

B31d

German class: 54 f-2/30

M 64635 VII b / 54 f
March 24, 1965
17th August 1967
March 14, 1968

Display day:

Issue date:

The patent specification corresponds to the patent specification

The invention relates to a device for closing the overlapping seams of jacket blanks for vessels made of paper, plastic or metal foil with at least one closing cup for Receiving a blank and with a mandrel that the preformed blank by placing it on the Inner jacket of the closing cup converted into the final jacket shape, as well as with one through one Sealing jaw protruding through the slot in the closing cup to seal the overlap seam.

In devices of this type, the sealing or the firm joining of the overlapping points has hitherto been carried out in that the two overlapping flaps on the inner overlapping side contain a layer of glue which has already dried. This is generally a heat seal glue. The mandrel that causes the shape to be formed is heated and pressed against the overlap by spreading or a force acting from the side, so that the overlapping parts of the jacket experience a sealing pressure between the metal cup and the mandrel and are thereby firmly joined together. When using heat-sealable cardboard, in which the entire inside of the jacket blank is lined with a heat-sealable material, e.g. B. with a polyethylene layer, this process is difficult because the heat must be transferred to the heat-sealed seam from the polyethylene-coated side through the paper. The polyethylene layer itself is heated to a great extent and therefore easily sticks to the mandrel or forms bubbles as a result of excessively high temperature. One was forced by these phenomena to switch to other methods, for example that the jacket surfaces are wound on mandrels and finished in such a way that heating jaws coming from the outside seal the jacket. However, this process requires completely different types of equipment and machines. Where machines according to the previously described method were available, the first thing to do was to heat the closing beakers and keep the mandrels cold or artificially cool them. In this case, the cold mandrel penetrates the preformed blanks in the closing cup and, as described above, is also pressed against the cup wall, the heat coming from outside. This method, too, has the disadvantage that the side wall lies in the generally heated metal cup for a relatively long time and the paper is unnecessarily preheated, as a result of which it can easily warp. In addition, this operation is mostly used to speed up the device for closing the overlapping
Seams of jacket blanks for
Paper vessels and the like

Patented for:

Maschinenfabrik Rissen G. m. B. H.,

Hamburg-Rissen, Suurheid 20

the machine cycles is divided and on so-called turntable presses or turntables z. B.

* 5 six such MetaHbecher are attached in the first the jacket blank is brought in. For bringing in these cut-to-size cloaks there there are various methods, e.g. B. the blanks are pushed in, with due to Guides which form the overlap, or the side walls are on an upstream device Rolled up in so-called roll pots and thereby brought into the metal cups in an overlapped form. The exact position of the coats cannot be guaranteed. It is therefore a special facility intended for aligning the jacket in a next station before the sealing takes place.

It is also known to tangentially insert the blank through a slot in the closing cup, the pushers being controlled to release the inserted blank as soon as the front edge of the blank sliding along the inner circumference of the cup, the cup slot has reached again and the point of overlap lies in the area of this slot, through which subsequently a sealing jaw passes through. The position of the jacket blank for the seal is thereby determined the insertion device determines. However, good accuracy is only possible if the effort is relatively high available.

The invention is based on the object of a device of this type in which the seal the alignment takes place by means of a sealing jaw which passes through a slot in the closing cup of the jacket blank to be carried out independently of the insertion device. The solution is there in that a rotary drive equipped with a driving mandrel is provided for the blank and that the slot provided in the closing cup is opposite to the direction of rotation of the blank and as a stop for the external overlap

809 516/271

has pungskante of the blank formed edge.

The alignment of the jacket blank in the cup is initially carried out as before by a Centering mandrel, so that the jacket leans against the walls of the lock cup, but with the centering mandrel at the same time still exerts a rotary movement on the jacket, with which not only the cup moves in its diameter is aligned, but also with which the seam is in the desired angular position is brought. The tendency of the jacket cut to open up to the outside is exploited, in that the edge of the jacket, as soon as it comes into the slot, wants to move tangentially and now abuts the stop edge in the slot without additional flaps or the like being provided would have to be. The rotary movement of the jacket is caused, for example, by a Nose attached to the mandrel.

While in FIG. 1 and 2 of the drawing show a known arrangement of a jacket seam formation is, the F i g. 3 to 5 an embodiment of the Invention schematically, in F i g. 3 a cup with a non-aligned jacket blank and in FIGS. 4 and 5 a cup with a centering device in transverse and longitudinal sections.

In the metal or closing cup 1 according to FIG. 1 there is a jacket blank 3, which was previously shown in has been aligned with another operation, and the closing punch 2 is in this jacket blank penetrated. There is just about a gap between the locking ram 2 and the locking cup 1 large that the paper fits in between with an overlap. The vertical limitation of the jacket 3 according to below is given by a plunger 5, which later ejects the jacket. In the lock cup 1 is located a window through which a pressure piece 4 passes, which in turn by a screw 6 on Falling out is prevented. A jaw 7 coming from the outside presses against this window piece 4, the movement with adjustable spring pressure or, for example, by means of a hydraulic piston generated in the direction of arrow 8. So that the pressure piece is initially against the side 9 of the lateral surface pressed; this in turn presses against the punch 2, and the punch itself is then against the metal cup 1 pressed against, so that between the mandrel and cup in the point indicated at 10 the overlap is compressed. Other methods use a instead of pressure Window from the outside also the thorn pushed apart by a wedge. Use other methods a lever to push the mandrel against the overlap. It is clear from the sketches that with In these procedures it does not matter which one exact location or angular alignment the overlap 10 is located. You just have to be roughly opposite that Window pressure piece 4 lie so that there is no lateral displacement of the pressure curve, but in the area from 5 to 10 mm, the position does not matter here. It will be different if you try wants to make the overlap with a flap from the outside through a slot. Located the jacket cut z. B. so in the closing cup, as in F i g. 3 then would occur upon penetration of the centering dome, the overlap occurs at a point opposite the point where it is when closing from the outside belongs.

It is now according to the invention by a nose 11, which sits on a centering mandrel and which is moved in the direction of arrow 12, the inner blank edge 15 by rotating the mandrel, the outer blank edge 13 in the position in which the overlap come for the purpose of sealing is supposed to be held. This is illustrated in more detail in FIG. 4. The nose here is part of a centering punch 14. It is designed like a knife, and behind this knife there is a long leaf spring 12 a (FIG. 5), that of the nose 12 a Outward tendency. The nose 12 is the front part of a flat piece 12 c located in a slot 12 b , behind which the leaf spring 12 a is located. A pin 12 d prevents the flat piece from falling out. When the centering punch is rotated, this nose 12 now grips behind the inner blank edge 15 and rotates the entire blank in the direction of the arrow. Since the blank has the tendency to revert to the flat shape from the curved shape into which it was forced, the edge 13 of the blank is pressed against the periphery of the inner delimiting surface of the closing cup. From the moment when the blank edge 13 comes past the first edge of the slot 16, it is no longer forced into the rounded shape, but straightens in the form of a tangent and will thereby hit the edge 17 of this lock beaker slot.

The centering punch is stopped with its movement at this moment. The rotational alignment of the centering punch 14 is only due to the jacket length and the position of the slot or the Slot edge 17. In the starting point of the rotary movement, the nasella is about 20 to 30 ° in front of the normal position of the jacket blank edge 15 so that it is detected in all cases. The rotary motion is ended when the edge 15 is in front of the slot edge 17 by the overlap width. About this position of the jacket blank, which is normally retained by its internal stress, possibly still To secure in particular, suction holes 18 can now be connected to suction air, so that the coat cannot change this position again. In the next station, the one when switching on is reached, now comes the one aligned according to the diameter and the angular position overlapped jacket blank in the area of a thermostatically heated closing jaw 20. This is advanced in the direction of the arrow so that the sealing pressure is now generated by the jaw 20. Before the Jaw 20 has proceeded is in the closing cup with the aligned jacket blank contained therein penetrated a locking pin, not shown here. Between this mandrel and the heated one Closing jaw 20 is now sealed.

So that during the alignment process the jacket blank also really does against the slot edge 17 is pressed, in view of the relatively thin cardboard thickness (about only 0.2 to 0.5 mm) the device must be made particularly precise. Since the parts are partially overhung, it's over For this reason it is provided that the centering mandrel 14, which has a conical taper in its front end 22 in order to be able to push apart the roughly aligned coat in any case, seated axially movably on a spindle-like mandrel 23. The spindle 23 carries a self-running tip

24, which in turn penetrates into the plunger 25. The plunger 25 corresponds to that described in FIG Plunger 5. It is used to limit the alignment and insertion of the jacket blank form below; in a later station it is moved in the direction of arrow 26 to finish the formed Eject coat from the lock cup. The actual centering pin 14 can now move when it penetrates adjust the spindle 23 axially so that it just touches the paper walls with its own weight and so a minimal friction, always determined by its own weight the paper. The rotation is then carried out by rotating the spindle 23, which in turn Via the pin 27 and a groove 18 present in the centering mandrel, the centering mandrel during rotation takes away. The rotation of the spindle 23 is controlled by suitable gear parts, e.g. B. by rotary magnet, generated by a compressed air rotating unit or by levers. In the case of an indexing table arrangement, two or more sealing stations in succession.

Claims (3)

Patent claims: 1. Device for closing the overlapping seams of cladding blanks for vessels Made of paper, plastic or metal foil with at least one closing cup for receiving of a blank and with a mandrel, which the preformed blank by applying to the Inner jacket of the closing cup converted into the final jacket shape, as well as with a through Sealing jaw passing through a slot in the closing cup for sealing the overlap seam, characterized in that a equipped with a rotary drive driver mandrel (14) is provided for the blank and that the The slot provided in the closing cup is opposite to the direction of rotation of the blank lying and designed as a stop for the outer overlapping edge of the blank Has edge (17). 2. Apparatus according to claim 1, characterized in that the one with a driving nose (11) provided centering pin (14), which the alignment of the jacket blank radially and with regard to makes its angular position, after penetrating into the lock cup on his extreme end is centered by a rotatable tip (24). 3. Apparatus according to claim 1 and / or 2, characterized in that the closing cup Contains suction lines (18) that ensure the position obtained by the centering for so long until it is sealed in the next operation. Considered publications:
U.S. Patent No. 3,049,979. 1 sheet of drawings 709 637/54 8.67 © Bundesdruckerei Berlin