EP1877233A2

EP1877233A2 - Device for separating a plastic clay column, comprising a universal notching device

Info

Publication number: EP1877233A2
Application number: EP06724735A
Authority: EP
Inventors: Rainer Koch; Frank Appel
Original assignee: Hans Lingl Anlagenbau und Verfahrenstechnik GmbH and Co KG
Current assignee: Hans Lingl Anlagenbau und Verfahrenstechnik GmbH and Co KG
Priority date: 2005-05-06
Filing date: 2006-05-05
Publication date: 2008-01-16
Anticipated expiration: 2026-05-05
Also published as: EP1877233B1; CN101175618A; DE102005063327B4; DE102005063454B4; WO2006119929A2; DE102005063327A1; RU2007145195A; CN101175618B; WO2006119929A3; RU2397864C2

Abstract

The invention relates to a device for separating a plastic clay column (2) into slugs (2a), said column being displaced along a conveyor passage (3). The device comprises at least one notching device (1) for notching the clay column (2) and a cutting device for cutting the clay column (2) in the notches, said notching device having notching strips (4) on all sides of the conveyor passage (3). In order to improve the notching device (1), all notching strips (4) are received independently of each other and can be displaced from a release position into a notch position and back which is offset from the center axis (3a) of the conveyor passage (3).

Description

Vorrichtune for separating a plastic clay cord, with a scoring device effective on all sides

The invention relates to a device according to the preamble of claim 1, 21 and 29.

A device according to the preambles of claims 1 and 21 is described in DE 33 06 852 Cl. In this known device, the notching device comprises a plurality of vertical notching strips, which are arranged on a side wall, an angle wall with a horizontal wall leg and a vertical wall leg and a plurality of bottom strips. The notches of a

Strangabschnitts takes place in several steps. In a first notching step, a transported Tonstranglängsabschnitt is stopped, and the side wall is moved with the vertical notching strips laterally against the Clay section and moved so far until the Clay section is located in a arranged next to the previous conveyor section position on the vertical wall leg and under the horizontal wall leg , By applying lateral pressure to the sidewall, the clay strand portion is notched on both opposite sides. In a second notching process, the lower and upper sides of the cladding section are notched between the floor slats and the horizontal wall limb.

This known device is not only complicated in terms of design and process, because the notching is done in two notching operations, but it is also of a large construction, which is required for notching to shift the clay strand section transversely to the conveying passage, which is undesirable or not in many manufacturing facilities is possible. In addition, there is a risk of poor notching and cutting quality because it is difficult to place the notches in a common plane and with a time delay in the cutting plane. The invention has for its object to improve a device of the type specified with respect to the notching device. In particular, the time required for scoring should be shortened. It is also a lateral movement of the clay strand can be avoided and it is also desirable to achieve a favorable load on the clay strand during notches.

This object is solved by the features of claim 1. Advantageous developments of the invention are described in the subclaims.

The invention is based on the finding that a notching of the clay strand in several consecutive notching steps not only an unfavorable load on the clay strand is exercised, but also leads to a difficult construction and control of the notch components.

In the embodiment according to the invention according to claim 1 are all

Notched strips mounted independently of each other and from a release position in an offset to the central axis of the conveyor passage notched position and moved back again. In this case, two opposing Kerbleisten, z. B. two laterally opposed or two superimposed notched strips or all notches, simultaneously be movable in their notch position. In this embodiment of the invention, therefore, the notched strips can be due to their independent arrangement and movement opposite each other and preferably simultaneously move for a notching process against the clays. This makes it possible to achieve a clean circumferential notch and a clean cut. These advantages are in particular due to the fact that the scoring is not time-delayed but at least on two opposite sides simultaneously. As a result, tolerances which are difficult to avoid are not easily avoided, but instead a simultaneous material stress takes place at the peripheral sections of the clay strand, the notches being located at the same time as the Tönstrang, thus ensuring improved shaping of the notches. It can also shorten the time required for notching to the time required to score with a notch bar. In addition, the clays due to the opposite function of opposing notching strips in its conveying position and thus in the Area of the conveying passage remain. Because of the opposing function of the notch ledges, the notches effecting forces on the opposite side form abutment forces centering the clay strand. Due to the possible in the fiction, contemporary design concentric arrangement of the notching strips, it is also easier possible, the notching device for a

To achieve notching with a matched to the conveying speed of the clay strand feed movement to achieve the notches and cutting during a continuous feed of the clay strand.

It is to stabilize the movement drive for the notch strips advantageous to move them by two arranged on both sides of its longitudinal center push and pull devices.

The preferably simultaneous movement of the notching strips can be carried out in a simple manner, in particular, if in each case two adjacent end regions of the notching strips have miter bevels limiting the free spaces in the region of which the notching strips can move into their notched positions and in the notch position on the miter bevels Can form movement stop. Since it is to be expected that accumulates clay material between the miter bevels, it is advantageous at least in one of the miter surface of

Gehrungsschrägen to arrange at least one recess for receiving the sound material. If the recesses are open to the outer periphery, z. As a whole or through channels are open to the outside, the clay material can be discharged to the outside, where it does not bother. This embodiment and movement control of the notching strips according to the invention is particularly well suited in combination with cross-split notching strips, namely so-called chamfering strips, between which a cutting element, in particular a cutting wire, can be moved transversely. As a result, not only the alignment of the notches or chamfers can be improved, but also the escape of the cut with respect to the chamfers, and thus the quality of chamfering and cutting quality.

In the apparatus according to the invention, the notching strips are located in a common transverse plane, wherein they are mounted independently of one another and are movable transversely to the conveying passage. There is therefore the requirement, the device or their notching device in such a way that the notching strips stabilize in their holder at least in the notch position. This object is achieved by the features of claim 14, wherein at least in one corner of the frame-shaped notched strips, the facing ends of two adjacent notching strips in their notch form fit into each other and thereby supported in the longitudinal direction of the conveying passage to each other and thereby stabilized. For this interlocking engagement, the existing notch webs are excellently, each bordering in a recess corresponding cross-sectional shape least in the notch of the adjacent notch strip.

It is particularly advantageous for the recess to be elongate, in particular continuous, in each case in the longitudinal direction of the associated notch. This configuration makes it possible to adjust the recess strip having a notching strip transversely to the passage axis and thereby adapt this notch strip to different cross-sectional dimensions of the strand to be notched. Depending on the arrangement of the notching strips this adjustment can be made horizontally or vertically.

It is therefore also advantageous to form the device or the notching device with an adjusting device, which makes it possible to adjust the adjustable notching strip with respect to their release position and to position, being from this positioned release position in the notch position and moved back again.

The invention also relates to the device or the notching device in such a way that horizontally and / or vertically opposite notching strips are adjustable with respect to their release position and thus adjustable to different cross-sectional dimensions of the strand.

A horizontal and vertical adjustability can be achieved in that the notched strips overlap in each case at one end the adjacent notch strip and are overlapped at the other end of the notch strip adjacent thereto, wherein all notching not only transversely to the passage axis, but also in each case in their longitudinal direction, ie in the circumferential direction of the passage, are movable and adjustable by an adjusting device. The invention is further based on the object to simplify a device according to the preamble of claim 21. This simplification is intended to affect in particular both the construction and the motion control.

This object is solved by the features of claim 21. Advantageous developments are described in the appended subclaims.

This embodiment allows a substantial simplification of the construction and the drive. In this case, the separation process can be done when notching the notch strips or in their notch position, whereby a rational operation is achieved, which also allows a clean cut.

A prescribed combination of the processes notches and cutting or separating can thereby further rationalize production and simplify the design, if several notching and cutting devices are arranged in the longitudinal direction of the passage one behind the other, preferably notched and cut simultaneously.

Although in DE 80 12 592 Ul a device for cutting split plates from a standing on the narrow side of the clay string is described, being arranged on both sides of the clay string opposite two each spaced apart Anfasleisten, which serve as a guide for the intermediate movable cutting element , This prior art device requires considerable design effort and control effort to guide and move the chamfers.

It is also known from EP 0 515 704 B1 to use for forming the notches at least one notch roll, which is moved along the side of the clay strand to be scored and thereby forms the notch. By a with respect to the nailing roll spatially and temporally staggered and effective cutting wire of the clay strand is cut after notching in the notch. This embodiment is constructive and control engineering consuming. The invention is therefore based on the object, a device according to the preamble of claim 29 to improve the cutting while ensuring a small construction.

This object is solved by the features of independent claim 29. Advantageous developments of the invention are described in the appended subclaims.

In the device according to the invention according to claim 29, the notch roller is formed by two pulley discs which are axially spaced from each other, the cutting wire extending between the pulley discs and intersecting the central portion of the pulley discs. In this device, cutting takes place continuously during notching. This not only reduces the processing time, but the device is also of a small

Construction, because the cutting wire is effective in the bow area where the associated roller discs dip into the clay cord and mold the notch. Since the cutting wire is always located in the middle of the roller discs, it is not only always centered in the notch, but it is also its leadership continuously ensured. In addition, during cutting, the notch is continuously formed and stabilized by the roll bow portions always present in front of and behind the cutting wire. Thus, not only a clean notch but also a clean cut is achieved, with the notch perimeter sections and the cut in the common transverse plane being in line with each other.

The embodiment according to the invention can be combined with conventional notching and chamfering devices arranged on adjacent sides of the conveying passage in order to obtain a clean cut also on these sides.

The inventive design also makes it possible to form arranged on both sides of the conveyor passage notch roll holder as a holder for the cutting wire, so that they form the cutting device with the cutting wire. Below, advantageous embodiments of the invention will be explained in more detail with reference to several embodiments and drawings. It shows:

Fig. 1 is a simplified representation of a notching device according to the invention for a device according to the invention for separating a plastic

Tonstranges in the front view, wherein the notching device is in its notch position;

FIG. 2 shows a notching device according to FIG. 1 in a modified embodiment; FIG.

FIG. 3 shows the notching device according to FIG. 2 in its release position; FIG.

4 shows the detail marked X in FIG. 1 in an enlarged view;

Fig. 5 shows the partial section V-V in Fig. 4;

6 shows a simplified representation of a notching device according to the invention in a further modified embodiment for an inventive device for separating a plastic clay cord in the front view, wherein the notching device is in its notch position;

Fig. 7 shows the section VII-VII in Fig. 6;

8 shows a simplified representation of a notching device according to the invention in a further modified embodiment for a device according to the invention for separating a plastic clay cord in the front view, wherein the notching device is in its notched position;

Fig. 9 shows the vertical section IX-IX in Fig. 8; _ _ - - -

10 shows a simplified representation of a notching device according to the invention in a further modified embodiment for an inventive device for separating a plastic clay cord in the front view, wherein the notching device is in its notch position; 11 is a simplified representation of a notching device according to the invention in a further modified embodiment for an inventive device for separating a plastic clay cord in the front view, wherein the notching device is in its notch position;

12 shows a simplified representation of a notching device according to the invention in a further modified embodiment for an inventive device for separating a plastic clay cord in the front view, wherein the notching device is in its notch position;

FIG. 13 shows the vertical section XIH-XHI in FIG. 12; FIG.

14 shows a simplified representation of a notching device according to the invention in a further modified embodiment for an inventive device for separating a plastic clay cord in the front view, wherein the notching device is in its notch position;

Fig. 15 is the vertical section XV-XV in Fig. 14;

16 shows a simplified representation of a notching device according to the invention in a further modified embodiment for an inventive device for separating a plastic clay cord in the front view, wherein the notching device is in its notch position;

17 shows a simple notching and cutting device according to the invention with an initial module and an end module in a further modified embodiment and in a perspective view;

FIG. 18 shows the horizontal partial section Xm-XHI in FIG. 17;

19 shows a multiple notching and cutting device according to the invention with an initial module, several along a conveying passage of the clay cord successively arranged add-on modules and an end module in a perspective view;

FIG. 20 shows the horizontal partial section XX-XX in FIG. 19; FIG.

FIG. 21 a perspective view of an add-on module of the notching device; FIG.

22 shows the lower corner region of two chamfer strips, which form a split notching strip, in an enlarged view in a viewing direction along the conveying passage;

FIG. 23 shows the corner area in the side view from the left; FIG.

Fig. 24 shows the corner area in the bottom view;

FIG. 25 shows the corner area in a perspective bottom view; FIG.

FIG. 26 shows a notching device according to the invention in further modified form. FIG

Design in approximately vertical cutting direction in perspective view;

FIG. 27 shows the notching device according to FIG. 26 in plan view; FIG.

28 shows the notching device in an arrangement with a horizontal cutting direction.

The notching device designated in its entirety by 1 is a component unit of a device not shown in FIGS. 1 to 5 for separating a plastic clay cord 2 into blanks, wherein the clay cord 2 and the blanks are likewise not shown in detail Conveyor be promoted by a - conveyor passage 3. The conveyor passage 3 may extend from an extruder for extruding the clay cord 2.

In all embodiments, identical or similar parts are designated by the same reference numerals. The notching device 1 has 4 notching strips 4, which extend on all four sides of the conveying passage 3 across the entire respective side of the conveying passage 3 in a common transverse plane, which is perpendicular to the central axis 3a of the conveying passage 3. The notching strips 4 are each adjustable transversely to the conveying passage 3 by a push and pull drive 5 illustrated in FIG. 1 as a double arrow. The push and pull drives 5 can each z. B. be formed by a spindle drive or by a hydraulic cylinder with a retractable and retractable piston rod. In this case, the notching strips 4 are in each case displaceable in the direction of the conveying passage 3 into a notch position in which a notched bar 4a located at its inner edge has a spacing from the clay strand 2 or at a respective cross-sectional dimension of the conveying passage 3 the notch 4a is pressed by a predetermined notch depth t in the clays 2. The notched ridges 4a each have the desired notch contour or notch angle.

Since the notching strips 4 are of the same design and correspondingly arranged with respect to the conveying passage 3 and are displaceable by the associated push and pull drive 5, a description of the remaining notching strips 4 can be omitted in detail for the sake of simplicity.

In the other embodiments to be described, identical or comparable parts are provided with the same reference numerals.

The embodiment of FIG. 2 differs from the embodiment of FIG. 1 in that here each notching strip 4 are associated with two thrust and traction drives 5, which with respect to the associated notching strip 4 have a circumferentially directed distance from each other and eccentrically and preferably symmetrically attack the associated notched bar 4. The push and pull rods acting on the notching strips 4 are each designated 5a. The push and pull drives 5 are attached to a frame 6, which surrounds the conveying passage 3 in an annular manner and has a correspondingly large central clearance 7 for the conveying passage 3. The frame 6 is a part of the other device, not shown, and held on this. FIG. 3 shows the exemplary embodiment according to FIG. 2 in the retracted release position of the notched strips 4, in which the notching webs 4a are each arranged in an outwardly directed distance a from the clay strand 2 or from a corresponding transverse dimension of the conveying passage 3.

The notching strips 4 have mitred bevels 8 in the region of their respective end regions forming a corner with the adjacent notching strip 4, which make it possible to move the notching strips 4 in the direction of the conveying passage 3 in such a way that they press into the clay strand 2 with their notched ridges 4a protrude into the conveyor passage 3. Preferably, the miter bevels 8 are arranged so that in the notch position shown in FIG. 1, 2 and 4, the miter bevels 8 of the adjacent notching strips 4 abut each other. This also results in a movement stop for the notching movement of the notching strips 4.

Since the notching of the clay strand 2 clay material in the region of the notch 4 b is displaced, it is to be expected that in the notch movement of the notched strips 4 clay material passes between the miter bevels 8. In order to prevent or at least reduce leakage of the clay material laterally from the miter slopes 8, it is advantageous to face one another in at least one, preferably in both

Gehrungsflächen the miter bevels 8 least a recess 9 to be arranged, which receives the clay material. It is further advantageous to arrange in the or the notching strips 4 discharge channels 11 for the clay material, each extending from the recess 9 and at a distance b from the associated notch 4a from the notch 4 open. Through the discharge channels 11 each enclosed between the miter bevels 8 clay material is passed to a channel outlet, in the area the clay material due to its distance b to the clay strand 2 does not affect this, for example by material contact. In the embodiments according to FIGS. 1 to 4, the discharge channels 11 are formed by extending transverse to the ^"miter bevels 8 channels I Ia, the transversely extending in to the side faces of the notching strips 4 channels open 1 Ib, the outlet holes of the thus in the side faces Notching strips 4 are arranged. If the recesses 9 are open towards the outer periphery, the material can be cleanly discharged to the outer periphery.

The penetrating into the material notched surfaces 4c of the notched ridges 4a may correspond to a desired contour and are preferably wedge-shaped, z. B. with a wedge angle of about 90 °.

The notching strips 4 can each have a length L which corresponds to the outer spacing c of the notched ridges 4 a from notched notching strips 4. With such a length L, the mutually adjacent notching strips 4 overlap each other only in the region of the notching webs 4a. In this case, the end faces of the notched strips 4 can be chamfered by inclined surfaces 12, as shown in Figures 1 to 4 and 17 to 26.

For a notching operation, all notching strips 4, in this case four, are simultaneously moved out of their release position according to FIG. 3 into the notching position according to FIGS. 1, 2 and 4. In each case, the notch pressure of opposing Kerbleisten 4 acts as back pressure. The clays 2 is consequently not pressure on one side but from both sides opposite each other simultaneously, whereby the cladding is dimensionally stabilized, which is favorable for a desired maintenance of the position of the cladding with respect to the central axis 3a of the conveyor passage 3. The risk that the clay strand 3 shifts laterally when notching is therefore avoided or low or reduced.

The device comprises at least one cutting device with a perpendicular to the conveyor passage 3 extending cutting wire 13 for horizontal or vertical cutting of the clay cord 2. Such a cutting device is known per se and therefore need not be described in detail. It is arranged offset in the embodiment of FIGS. 1 to 5 with respect to the notching device 1 in the longitudinal direction of the conveying passage 3, and it is effected by a horizontal or vertical movement of the cutting wire 13 through the clay strand 2 in the region of the notches 4 b existing on all sides. The cutting takes place in the notching devices according to FIG. 1 to 5 thus spatially and temporally offset notches with the notching device first The embodiment of the notching device 1 according to FIGS. 6 and 7 corresponds in principle to the above-described embodiments, but it is a notching device 1 for notching a strand 2 with rounded longitudinal edges. In such an embodiment, the notched ridges 4 a are concavely rounded in the region of the existing corners, wherein the notched ridges 4 a rise at their ends rounded in the region of a 1/8 circle and terminate at the miter bevel 8. In this embodiment and also in the exemplary embodiments up to FIG. 15, the notching strips 4 and 4d to 4g are formed by flat strips whose thickness may correspond to the width of the associated notch 4a. Also missing in the embodiment of FIG. 6 z. B. by inclined surfaces 12 trimmed outer corners, the miter 8 8 z. B. extend into the outer corners of the notching strips 4.

In the embodiment of FIGS. 8 and 9, the notching device 1 is formed differently in the region of the mutually facing ends of two notching strips, wherein this modified configuration can be arranged only in one or in two opposite or in all corner regions of the notching device 1. It is the purpose of this modified embodiment to stabilize the bearing of the notched strips, at least in a corner region of the passage 3. The stabilization is achieved in that the one notched bar 4d at least with its notch 4a over at least the notch 4a of the other notching 4e is extended and the other notched strip 4e at least in its overlapped by a notching strip 4d end wall region has a recess 4h for the notch 4a of a notched strip 4d. Preferably, the cross-sectional shape of the recess 4h is adapted to the cross-sectional shape of the notch 4a penetrating therein, that the

Kerbsteg 4a with its z. B. wedge-shaped flanks 4c positively abuts the flanks 4i of the recess 4h and the recess 4h fills. As a result, the two notching strips 4d, 4e are positively supported against one another and stabilized, at least in the longitudinal direction of the passage 3. - - ^"

Both notching strips 4d, 4e are movable between their release position and their notch position in order to carry out a notching process. For the overlapped notching strip 4e, this is also ensured in the notching position of a notching strip 4d, when the overlap dimension with which the notch 4a of a notching strip 4d forms the Notch 4a of the other notching strip 4e overlaps, is greater than the stroke between the release position and the notch position. In the exemplary embodiment, one notched bar 4d is extended to a greater extent beyond the other notched bar 4e, preferably at least to the outer edge of the other notched bar 4e, wherein the recess 4h in the other notched bar 4e extends over its entire width, ie, continuously. As a result, the shaping is simplified because both a notched strip 4 d and the recess 4 h can be formed profiled or continuous. In addition, it is possible in this embodiment, the overlapped notched strip 4e in the longitudinal direction of the overlapping notching strip 4d to move transversely to the passage 3 in order to set different strand dimensions on at least one side of the strand can.

In the area of the remaining corners of the notching device 1, this may be designed differently, for. B. miter bevels 8 of the above embodiments.

However, it is advantageous for the following reasons, the one of the notched bar 4d opposite notched bar 4f and trained in the manner described above other notched bar 4e with respect to a transverse to the other notched bar 4e - here horizontally - extending longitudinal median plane 3b or the vertical longitudinal median plane 3c of the notch 4d, 4e, 4f, 4g limited passage 3 mirror-symmetrical form. This makes it possible to move the notching strips 4e, 4g between the notching strips 4d, 4f in the direction of the passage 3 and back and thus to change the respective cross-sectional dimension of the passage 3 and its horizontal width and set to a desired level. Therefore, it is necessary for the notches of different width strands 2 no special notch 4e. To set a desired width, this notching device 1 is set up so that it can be adjusted with respect to its release position, taking into account the desired width of the passage 3 or strand 2. The cross-section Verstellmaß may be small or large, z. B. be smaller or larger than the height or width of the notched strips 4d to 4g.

In a twisted in the transverse plane by 90 ° arrangement of the notching device 1 shown in FIG. 8, different strand heights can be adjusted. The setting of the respective strand dimension can be done by a suitable adjustment device 4j for adjusting and positioning the respective notching strip 4e, 4g. The adjusting device 4j is illustrated by a double arrow extending transversely to the associated notching strip 4e, 4g. It can be provided centrally for each notching a single adjustment device 4j (not shown), or it can be provided with respect to the longitudinal direction of the notched bar except centrally arranged adjusting devices 4j, as shown in the embodiments of FIGS. 8 to 16 show. By means of the at least one adjusting device 4j, the respective notching strip can be adjusted and adjusted inwards or outwards with regard to its release position. From the release position, the notching strip can be moved by the associated push and pull drive 5 in the notch position and pull back.

Fig. 8 shows the notching strips 4d to 4g in the notch position, in which the notched ridges 4a are pressed by the notch depth t in the strand 2 and with their miter bevels 8 to each other, with the overlapping notched ridges 4a of the upper and lower notched strip 4d, 4f are in the recesses 4h of the side notching strips 4e, 4g. From these notch positions, the notched bars 4d to 4g are moved by the push and pull drives 5 in each case by a transversely outwardly directed movement into the release positions not shown in this embodiment, which, however, are comparable to the release positions shown in FIG.

In the context of the invention, the movements in the notch positions of all notching strips 4d, 4g can take place simultaneously, wherein on both sides in each case a bilateral notching pressure is exerted on the strand 2, which cancels itself. But it is also possible first to move the upper and lower notched bar 4d, 4f in the notch position and then to move the lateral notching strips 4e, 4g in the notch position, the notched webs 4a of the horizontal notching 4d, 4f with the recesses 4h of lateral notching strips 4e, 4g in each case form a guide F, in which the interlocking notched bar ends are held together in a form-fitting manner in the longitudinal direction of the passage 3. If, on the other hand, the notching strips 4d to 4g are moved into the notching position at the same time, they find the abovementioned form-fitting support and stabilization only in the notch movement end position. In the embodiment according to FIGS. 8 and 9, the upper and lower notching strips 4d, 4f have no setting device 4j, so that this notching device 1 can only be adapted to different width dimensions of the respective strand 2. Basically, it is sufficient for a lateral adjustability of the notching device 1 to a desired strand width, if only one of the two lateral notching strips 4e, 4g is adjustable by an adjustment device 4j. If, on the other hand, both lateral notching strips 4e, 4g are adjustable, a symmetrical adjustment relative to the longitudinal axis 3a of the conveying passage 3 can be realized, which is desirable because the strand 2 is preferably conveyed through in the center.

The embodiment of FIG. 10 differs from the embodiment of FIG. 8 differs in that the notched ridges 4 a of the overlapped notched strips 4 e, 4 g extend concavely rounded in their end to limit rounded corners or round corners and a strand 2 with rounded Long edges to score. In the exemplary embodiment, the notched ridges 4a are curved in the region of an angle W of approximately 90 °, wherein they terminate at the end edges 4al on the flanks 4c of the continuously formed notch 4a of the overlapping notching strip 4d, 4f. The inner radius r of the concave curvature is z. B. as large as the notch depth t.

For the realization of the adjustment device 4j there are several functional embodiments. It is essential that the relevant notched bar 4e, 4g relative to a carrier carrying them, z. B. the frame 6, in the respectively desired release position is movable and thus adjustable. This can be z. B. realize that the at least one respective associated push and pull drive 5 relative to the carrier or frame 6 in the direction of the conveyor passage 3 and back is movable and can be fixed in the respective setting position or each at least one associated push and pull rod 5a relative to its guide housing in the direction of the conveyor passage 3 and movable back and pόsitiόnierbar in the respective adjustment position or the respective notched bar 4 relative to the associated at least one push and pull rod 5a is adjustable and positionable in the respective adjustment position. In the embodiment of FIG. 11, the notching device 1 is adjustable both with respect to different strand widths and strand heights.

With regard to an adjustability of the strand height is basically to be noted that it requires only an adjustability of the release position only the upper notched bar 4d, because the bottom of the strand 2 is always the same height even in the presence of different strand heights, which by a non-adjustable in this regard conveyor support for the strand. 2 is conditional.

In the embodiment according to FIG. 11, the horizontally or vertically mutually opposite corner regions of the frame-shaped notching strip arrangement are not mirrored with respect to the vertical longitudinal center plane 3c or the horizontal longitudinal center plane 3b of the conveying passage 3, as in the exemplary embodiment according to FIG. 8, but are twisted equally and by 90 ° trained and arranged. Therefore, all notching strips are designed so that they partially or completely overlap the adjacent end of the other notching strip with their one end region and have the recess 4h at their other end, wherein they at least in this recess region of the notch end associated with this notch with one in the recess 4h enclosing notch 4a are overlapped. In other words, the corner regions formed by adjoining end regions of the notched strips are in principle of the same design, but in each case the corner region following in the circumferential direction is arranged rotated by 90 ° relative to the previous corner region and formed. This is achieved in that the notched strips each have the preferably continuous recess 4h at one end, into which the notch 4a of the adjacent overlapping notching strip surrounds, and at its other end with the associated notch 4a into the preferably continuous recess 4h adjacent to this end Border notch bar.

In addition, all notching strips 4d to 4g are each adjustably mounted in their longitudinal direction, namely in the same circumferential direction and by a second adjustment device 4k adjustable and positioned in the respective adjustment position. These adjusting devices 4k make it possible to adjust the respectively associated notching strip 4d to 4g in the circumferential direction and their overlapped ends to the desired transverse dimension of the strand 2, ie to the desired width and / or height to adjust. For this adjustability, different relative movements can be exploited, which have already been described for the adjusting device 4j. In the sense of these alternative embodiments for the adjusting device 4j, the adjusting devices 4k can also be formed in each case.

For an adjustment and adjustment of the strand width, the lower notching strip 4f and the laterally overlapping notching strip 4e are displaced horizontally, namely to the left or right, so that the overlapping lateral notching strip 4e is in the desired release position. In a corresponding manner, the upper notching strip 4d and the opposite lateral notching strip 4g are adjusted horizontally and adjusted by positioning, which allows the setting device 4k for the upper notching strip 4d and allows at least one setting device 4j for the lateral notching strip 4g.

For a reduction or increase in the strand height, the right-side notching strip 4e and the upper notching strip 4d are adjusted and positioned downwards or upwards, which enables at least one setting device 4k for the lateral notching strip 4e and at least one setting device 4j for the upper notching strip 4g , so that the upper notching strip 4d is in the desired release position.

For horizontal and vertical reduction or enlargement of the notching strip arrangement, all notching strips 4d to 4g are adjusted and positioned as described above and thus adjusted.

Since a vertical adjustment of the lower notching strip 4f is not required because of a constant height of the underside of the strand and therefore their release position is not changed normally, there is no need for vertical adjustment of the side notched bar 4g overlapped by the lower notched bar 4f. That is, for the lower notching bar 4f, there is no first setting device 4j, and for the underlapped side notching bar 4g, no second notching device 4k is required. For the same construction, however, these adjusting devices may be present, which is illustrated by dash-dotted representation. The exemplary embodiments according to FIGS. 12 to 17 differ from the previously described exemplary embodiments in that a notching and cutting device is provided for notching and cutting the clay strand 2 in a common transverse plane. This notching device is formed by a chamfering device 14, which presses chamfers 14a, 14b into the clay strand 2 at the edges of the ends of formations 2a to be cut, wherein two respective chamfers 14a, 14b adjacent to one another on the cutting plane of the clay strand 2 together form a notch , In this embodiment, on both sides of the conveying passage 3, two transverse split notching strips, namely so-called Anfasleisten 15 arranged parallel to each other - as seen along the conveyor passage 3 - the design of the undivided notching 4 correspond, so to describe the Anfasleisten 15 to the description of the notched strips 4 including the miter surfaces 8 and the push and pull drives 5 reference is made.

As regards the joints present in the corner area between the notching strips, the exemplary embodiment of FIGS. 12 and 13 corresponds to the exemplary embodiment according to FIGS. 6 and 7, the embodiment according to FIGS. 14 and 15 to the exemplary embodiment according to FIGS. 8 and 9, the exemplary embodiment FIG In the latter case, the notched strips 4 and 4d to 4g are formed by the Anfasleisten 15 and a special notching device, namely a chamfering device 14, form. In contrast to the exemplary embodiment according to FIG. 18, however, the chamfering strips 15 are formed by flat chamfering strips 15 whose thickness corresponds essentially to the thickness of the chamfering webs 15b of the exemplary embodiment according to FIG. 18, while the chamfering strips 15 of FIG Embodiment of FIG. 18 are formed in an angular cross-section.

Seen in the cross section according to FIGS. 3, 15 and 18, the chamfering strips 15 have a distance d extending from one another along the conveying passage 3 and thus a slot 15e therebetween which, in the region of their edges facing the conveying passage 3, takes into consideration a movement play of the cross-sectional size of the cutting wire 13 corresponds to the cutting device. The chamfering surfaces 15a corresponding to the desired cross-sectional shape of the chamfers 14a, 14b on the chamfering strips 15 are preferably also wedge-shaped surfaces, which form an acute angle, in particular approximately 45 °, with the transverse cutting plane. The thus z. B. oblique Fasungsflächen 15 a are arranged transversely in the direction of the conveyor passage 3 extending chamfers 15 b, where the push and pull drive 5 acts directly or indirectly. In the embodiment, the chamfers 15 with their chamfers 15b and bar webs 16 are formed angularly, the push and pull drives 5 engage the bar webs 16. The two bevel strips 15 are mirror-inverted with respect to the sectional plane Es. Between the chamfer web 15b and the power web 16, an angular chamfer foot 15c may be arranged. The existing between the chamfers 15b slot is outside funnel-shaped divergent, in particular in the region of the thickened Fasenstegfüße 15c to facilitate the insertion of the cutting wire 13. The configuration of the recesses 9a in the view of FIG. 24 is the same as the previously described embodiment.

The Anfaege 15b are fixedly connected to the associated strip web 16 and thus each form a moving unit, in the sense of the above embodiments each by one or two push and pull drives 5 between the chamfer shown in Fig. 18 and the retracted (not shown) release position is movable.

The chamfer strips 15 also have, in the region of their miter slopes 8, at least one recess, which is open to the outside and can lead away the clay material. In this embodiment, the recesses are each "divided" by the distance d between the Anfasleisten 15, denoted by 9a and not only to the outside, but also open to the slot 15c.

As FIGS. 22 to 25 show, the recesses 9a are mirror-inverted with respect to the sectional plane Es (FIG. 23) and the miter bevels 8 (FIG. 22) and are formed by recess surfaces 9c diverging outwards and relative to the sectional plane Es. These recess surfaces 9c are preferably formed to abut the edge 15d formed by the miter 8 exit. The recess surfaces 9c may also leak at a small outward distance from the edges 15d (not shown).

In this embodiment, the chamfering located between the miter bevels 8 clay material is pinched off by the edges 15d and separated to the outside, whereby in the corner regions of the Clay 2 clean chamfers are achieved.

The configuration of the recesses 9a in the view of FIG. 24 is the same as the previously described embodiment.

Since all Anfasleisten 15 also with respect to the miter bevels 8 and recesses 9 a formed the same and are arranged and driven on the circumference of the conveying passage 3 and driven as the notching strips 4, it is only necessary to simplify the following description.

As already the notching device 1 of the embodiment according to FIGS. 1 to 5, the chamfering devices 14 and the cutting device illustrated by the cutting wire 13 are advanced in a manner known per se with the advancing speed of the clay cord 2 for a notching and cutting operation.

For a chamfering operation, the chamfering strips 15 are preferably pushed simultaneously against the clay strand 2, whereby they press into their cleavage strand 2 with their chamfering edges 15b two chamfers 14a arranged in mirror image.

The cutting of the clay strand 2 by a per se known cutting device, of which only the cutting wire 13 is shown, during the Anfasbewegung and / or when the Anfasleisten 15 are in their Anfasstellung and / or then when the Anfasleisten 15 in their Release position to be moved back. In this case, the cutting device is located with the cutting wire 13 in the cutting plane Es. For the chamfering and cutting of the next molded article 2a, the movements of the chamfering strips 15 and the cutting wire of the cutting device repeat accordingly. The embodiment according to FIGS. 17 and 18 thus comprises a single notching and cutting device.

The advantages described above are also achieved when initially only two, in particular laterally opposing notching strips 4 or chamfer strips 15 and then the other two preferably also be advanced simultaneously. Particularly advantageous is the simultaneous advancement of all notch or chamfer strips 4 or 15. The above also applies to the return movement of the notched strips 4 or chamfers 15.

In the embodiment according to FIGS. 17 and 18, the chamfering strips 15 form an initial module Ma and an end module Mz. For a simultaneous cutting of a plurality of shaped articles 2a, a plurality of such modules and cutting devices are arranged one behind the other in the desired number in the longitudinal direction of the conveying passage 3 in the mold length , wherein the chamfering and cutting in the sense of the above-described possibilities in all Anfasvorrichtungen 14 and cutting devices can be done at the same time. It is advantageous for simplifying the device to combine the adjacent starting and end modules of such modules Mx to a construction and movement unit, so that only a push and pull drive 5 is required, as shown in FIGS. 19 and 20 show. FIGS. 19 and 20 show a plurality of such add-on modules Mx according to FIG. 21, which are each combined with an initial module Ma and an end module Mz and are in operation for chamfering and cutting at the same time.

As shown in FIG. 20, a plurality of end modules Mz may be arranged one behind the other in the passage direction and the groove 2a may be scored and cut, wherein a group comprising an initial module Ma, one or more attachment module Mx and an end module Mz preferably simultaneously scores and cuts the strand 2a, so that an at least two opposing notching strips 4 or chamfering 15 comprehensive scoring or all notching strips 4 or Anfasleisten 15 comprehensive notching and cutting operation for the group can preferably be done simultaneously. In the context of the invention, it is possible not to connect the Anfasleisten 15a of the add-on modules Mx each other, but preferably by at least one own associated push and pull drive 5 to move simultaneously, as indicated in phantom in Fig. 20.

In the embodiments according to FIGS. 26 to 28, a notching device 21 with two notching rollers 23 is provided, wherein a cutting device with a cutting wire 13 is integrated in the notching device 21 so that notching and cutting take place simultaneously.

This notching device 21 has on two opposite sides of the clay strand 2 or conveying passage 3 each a z. B. fork-shaped roller holder 22, are rotatably mounted on the respective two roller discs 23 a, 23 b of a nailing roller 23 about at least one approximately parallel to the central axis 3 a extending axis 24 or shaft. The roller discs 23a, 23b are arranged at an axial distance e from each other which is equal to or taking into account a movement clearance larger than the cross-sectional dimension of the cutting wire 13, which therefore not only between the roller discs 23a, 23b of both notch rollers 23 has room, but the roller discs 23a , 23b define the cutting wire 13 with their sides facing each other, whereby the cutting wire 13 receives a guide and is stabilized.

The roller discs 23a, 23b have on their circumference the desired notch contour or the desired notch angle.

In the area of the axes 24 and the web 22a of the roll holder 22, the cutting wire 13 may extend through channels disposed therein when it is to extend further to an associated cutting device. The cutting wire 13 may also extend radially adjacent to the axles 24 or shafts. It is essential that the cutting wire extends in the central region of the roller discs 23a, 23b and crosses the circumference of the roller discs 23a, 23b in the bow portion B, in which the roller discs 23a, 23b dip into the clay cord 2 during notches. In the context of the invention, the roll holder 22 can also form holding and guiding parts for the cutting wire 13 and thus form the cutting device in this regard.

The notching device 21 is thus combined with the cutting device, so that it is possible to simultaneously score and cut the clay strand. The cut direction illustrated by a double arrow may be vertical (Fig. 26) or horizontal (Fig. 28). In the case of a vertical cutting direction, the roll holders 22 and notching rolls 23 are in a lateral position with respect to the clay strand 2 or the conveying passage 3. In the case of a horizontal cutting direction, these parts are located above and below the clay strand 2 or conveying passage 3.

The notching device 21 is moved with the cutting wire 13 for notching each from one side of the clay strand 2 and conveying passage 3 to the other side. Therefore, there is no need for movements of the notch rollers 23 between a release position and a notch position on the clay strand 2 to and away from this, as is the case with the notch and Anfasleisten 4, 15 of the case.

It is also possible within the scope of the invention, however, to move the scoring roller 23 or two scoring rollers 23 arranged opposite one another with respect to the conveying passage 3 by means of a drive between a release position and a notch position.

For a notching and cutting operation, the two arranged on opposite sides nicking rollers 23 from a position in which it is with the cutting wire 13 on an other side of the clay strand 2 or conveyor passage 3, moved to the opposite side, wherein the nailing rollers 23rd Immerse the notch depth t in the clay strand 2 and roll with the advance of the notch rollers 23 two opposing notches simultaneously. At the same time, the clay strand 2 is cut with the cutting wire 13 arranged between the roller discs 23a, 23b in the continuous immersion region B.

In order to obtain a clean molding edge at least on the side of the clay strand 2 on which the cutting wire 13 exits, it is advantageous, on this side, preferably also on the opposite inlet side, a Anfasvorrichtung 25 with two transversely to the conveyor passage 3 extending chamfers 26a, 26b to be arranged, which have a along the central axis 3a directed distance from each other, which corresponds taking into account the cutting gap d the transverse dimension of the cutting wire 13 with movement play. Both Anfasleisten 26 a, 26 b is at least one push and pull drive 5, z. B. in the above sense, associated with which the Anfasleisten 26 a, 26 b are movable between their release positions and notch positions, as has been described for the Anfasleisten 15.

The Anfasleisten 26a, 26b are moved to the formation of an associated bevel in the clay strand 2 against this, before the notch rollers 23 are moved with the cutting wire 13 for performing those notches against the clay strand 2. In order to avoid a collision of the roller discs 23a, 23b with the Anfasleisten 26a, 26b, the latter have at their ends inside preferably to the notch shape of the roller discs adapted recesses 26c, through which the roller discs 23a, 23b are movable.

In order to ensure a trouble-free insertion of the cutting wire 13 in the slot between the chamfers 26a, 26b, the slot has at its the

Conveyor passage 3 side facing away from a funnel-shaped extension 26e.

In this notching device 21, the notch rollers 23 may or may not be driven at a peripheral speed corresponding to the feed speed at the time of cutting. In the first case (driven), the load on the material of the strand 2 is relatively low because the material does not have to drive the detent rollers 23 with respect to their rolling motion. In the second case, the rotary drive of the notching rollers 23 or roller discs 23a, 23b takes place by a entrainment function of the material. - - -

A drive 27 for one or each of the scoring rollers 23 may, for. B. have a rack 31 which extends parallel to the cutting direction and by a drive connection, for. B. a gear train 28, with the associated scoring roller 23rd connected is. In the context of the invention, a respective associated electric drive motor for the pick rollers 23 may be provided.

In the notching device 21, a notch roller 23 need not be present on each of the opposite sides. This notching device 21 also works when only one notch roller 23 is present with the cutting wire 13 on one side. On the opposite side of the notch device z. B. in place of a nailing roll two more Anfassleisten 26 a, 26 b with associated push and pull drives 5 have.

In all embodiments, the movement of the cutting device or cutting wire 13 (Figures 1 to 18 and 26 to 28) or the cutting units 13 (Figures 19 and 20) forming a moving unit may be controlled so that the cutting movement of each of the and same side to the other side. The one or more cutting wires 13 are thereby moved back after each cut to always cut starting from the same side. This makes it necessary that the cut clay strand 2 after cutting by a spreader must be mechanically moved slightly apart (several mm) to create a gap in which the cutting wire 13 can be moved back without the clay strand 2 or the cut Touching shaping.

However, within the scope of the invention, it is also possible and advantageous for rational reasons to bidirectionally control the cutting device or the cutting wire or wires 13. That is, the cutting wire (s) 13 are alternately moved alternately from one side of the clay strand 2 and the conveying passage 3 to the other side and then from this other side to the one side, cutting the clay strand 2. In such a control, there is no Leerhub more, but it is cut at both transverse movements of the or the cutting wires 13 alternately from one side to the other side.

It is also advantageous in all embodiments in a conventional manner, the or the cutting wires 13 or in the Anführungsbeispielen according to FIG. 26 to 28 of notching device 21 and cutting wire 13 combined unit as a function of the conveying speed of the Tonstranges 2 in the Streaglaufrichtung 10 when notching and cutting to move at the conveying speed, so that the notching, and cutting during the promotion of the Tonstranges 2 can take place.

It is also possible within the scope of the invention to move the cutting wire or wires 13 with a horizontal cutting direction or vertical cutting direction. In both cases, the cutting wire or wires 13 are preferably arranged in a position inclined with respect to the cutting direction, which is shown schematically in FIGS. 1 and 2.

In the above-described embodiments, the notched surfaces 5c are described as wedge surfaces. In the context of the invention, the notched webs 4a and the chamfer webs 15b may have convexly rounded notched surfaces 4c or beveled surface. The notched surfaces 4c or chamfer surfaces can also be angled roof-shaped in cross-section.

Claims

claims

1. A device for separating a along a conveyor passage (3) movable plastic clay cord (2) in moldings (2a), with at least one notch device (1) for notching the clay cord (2) and a

Cutting device for cutting the clay cord (2) in the notches, wherein the notching device (1) on all sides of the conveyor passage (3) arranged notching strips (4), characterized in that all notching strips (4) are mounted independently of each other and from a

Release position in a to the central axis (3a) of the conveyor passage (3) offset offset notch position and back again.

2. Apparatus according to claim 1, characterized in that two mutually opposite notching strips (4), preferably two mutually laterally opposite notching strips (4e, 4g), or all notching strips (4d to 4g) are simultaneously movable into their notched position, in particular also back simultaneously are movable.

3. Apparatus according to claim 1 or 2, characterized in that the notching strips (4) in each case by a centrally arranged or two arranged on both sides of its longitudinal center push and pull devices (5) are movable.

4. Apparatus according to claim 3, characterized in that the pushing and pulling devices (5) on a frame (6) are supported, which surrounds the conveying passage (3).

5. Apparatus according to claim 4, characterized in that the frame (6) is formed by a plate.

6. Device according to one of the preceding claims, characterized in that each have two adjacent end portions of the notching strips (4) miter bevels (8).

7. Apparatus according to claim 6, characterized in that in one or both mutually facing mitring surfaces of the miter bevels (8) at least one recess (9) for receiving

Clay material of the clays (2) is or are arranged.

8. Apparatus according to claim 7, characterized in that the at least one recess (9) to the outer peripheral region of

Notching strips (7) is open.

9. Apparatus according to claim 8, characterized in that the at least one recess (9) up to or close to the

Corner edges (15d) extending from the miter slopes (8) and the conveyor passage (3) facing notched surfaces (14c) of the notching strips (4) are formed.

10. Device according to one of claims 7 to 9, characterized in that extending from the one or more recesses (9) at least one channel (I Ia, IIb) in the associated notching strip (4) and at an outlet hole (Hc) emerges, with respect to the recess (9) is offset to the outside.

11. Device according to one of the preceding claims, characterized in that the notching strips in each case by two in the circumferential direction of the conveying passage (3) side by side extending chamfers (15) formed are spaced from each other in the longitudinal direction of the conveying passage (3), wherein a cutting device is provided with a cutting wire (13) movable between the chamfers (15) across the conveying passage (3).

12. The device according to claim 10, characterized in that two or more in the longitudinal direction of the conveying passage (3) spaced from each other groups are provided with two Anfasleisten (15) and a cutting wire (13) for chamfering and cutting in

Essentially movable simultaneously.

13. The apparatus according to claim 12, characterized in that of two adjacent groups each other in the

Passage direction (10) following Anfasleisten (15) are interconnected and by a common push and pull device (5) are movable.

14. Device according to one of the preceding claims, characterized in that of two mutually adjacent in a corner notching strips (4d, 4e) the one notched bar (4d) at least with its notch (4a) over at least the notch (4a) of the other notching strip ( 4e) is extended, and the other notching strip (4e) has a recess (4h) at least in its end wall region overlapped by the one notching strip (4d), which is adapted to the cross-sectional shape of the notch (4a) of one notching strip (4d).

15. The apparatus according to claim 14, characterized in that the one notched bar (4d) to change at least to the outer edge of the

Notching strip (4d) extends and the recess (4h) in the other notching strip (4e) extends continuously.

16. The apparatus of claim 14 or 15, characterized in that the vertically and / or horizontally opposing notching strips (4d, 4f or 4e, 4g) with respect to the central axis (3a) of the conveying passage (3) are arranged mirror-symmetrically and formed.

17. Device according to one of claims 14 to 16, characterized in that the overlapping notching strips (4d, 4f) are upper and lower notching strips or lateral notching strips (4e, 4g).

18. Device according to one of claims 14 to 17, characterized in that at least one, preferably both, overlapped notching strips (4e, 4g) by an adjusting device (4j) with respect to their release position in the direction of the

Delivery passage (3) and back adjustable and can be positioned in the respective adjustment position.

19. The apparatus according to claim 15, characterized in that the notched strips (4d to 4g) are formed and arranged rotated in their circumferentially following corner regions each with respect to the previous corner region by 90 °.

20. The apparatus according to claim 19, characterized in that the upper and lower notching strip (4d, 4f) and at least one lateral notching strip (4e) each adjustable by an adjusting device (4k) in the circumferential direction and in the respective adjustment position ^~ are.

21. An apparatus for separating a plastic clay strand (2) movable along a conveying passage (3) into moldings (2a), with at least one Notching device for notching the clay cord (2) and a cutting device for cutting the clay cord (2) in the notches, wherein the notching device has notching bars arranged on all sides of the transport passage (3) and movable between a release position and a notch position, characterized in that the Notching strips are each formed by two adjacent in the circumferential direction of the conveyor passage (3) extending chamfers (15) having a in the longitudinal direction of the conveying passage (3) directed distance (d) from each other, wherein a cutting device with a

Cutting wire (13) is provided, which is movable transversely through the conveying passage (3) between the Anfasleisten (15).

22. The apparatus according to claim 21, characterized in that two or more in the longitudinal direction of the conveying passage (3) spaced apart groups are provided with two Anfasleisten (15) and a cutting wire (13) which for chamfering and cutting substantially simultaneously movable are.

23. The device according to claim 22, characterized in that of two adjacent groups which in the passage direction (10) following Anfasleisten (15) are interconnected and by a common push and pull device (5) are movable.

24. Device according to one of claims 14 to 23, characterized in that the one another in the passage direction (10) following Anfasleisten (15) by a strip web (16) are interconnected and the thrust and

Pulling device (5) on the bar web (16) attacks.

25. Device according to one of the preceding claims, characterized that in each case two adjacent end regions of the notched strips (4) or chamfer strips (15) have miter bevels (8).

26. The device according to claim 25, characterized in that arranged in one or both mutually facing mitring surfaces of the miter bevels (8) at least one recess (9, 9a) for receiving clay material of the Tonstranges (2) or are.

27. The device according to claim 26, characterized in that extending from the one or more recesses (9) at least one channel (IIa, IIb) in the associated notching strip (4) and at an outlet hole (Hc) emerges, with respect to the recess ( 9) is offset outwards.

28. The device according to claim 26 or 27, characterized in that the recessed surfaces (9c) at the corner edges (15d) of the Anfasflächen (15a) or at a small distance thereof expire.

29. Apparatus for separating a plastic clay cord (2) movable along a conveying passage (3) into shaped bodies, comprising at least one notching device (21) with an at least one side of the conveying passage (3) arranged on a notch roll (23) for notching the clay cord ( 2) and a cutting device having a cutting wire (13) extending transversely to the conveying passage (3) for cutting the clay cord (2) in the notch, characterized in that the tacking roller (23) is formed by two roller discs (23a, 23b), which have an axial distance from each other, wherein the cutting wire (13) extends between the roller discs (23a, 23b) and the central region of the

Roller discs (23a, 23b) cuts.

30. The device according to claim 29, characterized that on the opposite side of the conveying passage (3), two roller discs are arranged, which have an axial distance from each other, wherein the cutting wire (13) also extends between these roller discs (23a, 23b) and cuts the central region thereof.

31. The apparatus of claim 29 or 30, characterized in that on the said nipper roller (23) adjacent sides of the conveying passage (3) each have a chamfering device with a cutting gap (d) for the cutting wire (13) is provided.

32. Apparatus according to claim 31, characterized in that the chamfering devices each by two the cutting gap (d) between them having chamfers (26 a, 26 b) are formed by a pushing and pulling device (5) transversely to the conveying passage (3) between a release position and a Anfasstellung are movable.

33. Apparatus according to claim 32, characterized in that the Anfasleisten (26 a, 26 b) at their ends inside recesses (26 c) for the passage of the roller discs (26 a, 26 b).