EP1199937A1

EP1199937A1 - Device for forming a strip of dough

Info

Publication number: EP1199937A1
Application number: EP00947663A
Authority: EP
Inventors: Robert Sauseng; Richard HÄUSLER
Original assignee: Koenig Maschinen GmbH; Konig Maschinen GmbH
Current assignee: Koenig Maschinen GmbH; Konig Maschinen GmbH
Priority date: 1999-08-03
Filing date: 2000-07-25
Publication date: 2002-05-02
Also published as: WO2001008497A1; CA2378882A1; AT409916B; ATA133699A; AU6138800A

Abstract

A device for forming a strip of dough, comprising a frame (2) and two sets (21, 22) of superposed rollers (23) arranged next to each other, whereby said rollers are driven in order to create a rotating movement about the horizontal axes thereof. The rollers (23) of each set (21, 22) are rotationally mounted on a carrier (24) which can move in relation to the frame (2). The dough passes from top to bottom through a gap which remains between the two sets of rollers (21, 22) and narrows towards the bottom thereof. All of the rollers (23) belonging to a set (21 or 22) are driven in the same direction. The lower rollers (23) of a set (21, 22) are however driven more quickly than the upper rollers belonging to the same set. The carriers (24) for each of the sets (21, 22) can be moved onto each other or away from each other by means of eccentrics (36, 45). An eccentric (36, 45) is mounted on each roller carrier (24) for this purpose. Said eccentric is driven in a rotational direction counter to the direction in which the dough passes. Each roller carrier (24) is mounted on top of another eccentric (36, 45) or connecting rod (51) in a position which is higher than or lower than said eccentric (36, 45). Said other eccentric (36, 45) or connecting rod (51) can be rotationally or pivotally mounted on the frame. As a result, the dough can be shaped into a desired form in a more sparing manner.

Description

Device for forming a dough sheet

The invention relates to a device for forming a dough sheet, with a frame and with two sets of juxtaposed sets of superposed, driven for rotation about their horizontal axes, the rolls of each set being rotatably mounted on a roller carrier movable relative to the frame and the dough passes through the gap narrowing downward between the two roller sets from top to bottom, and wherein all rollers of a set are driven in the same direction, but the lower rollers of the set are driven faster than the upper rollers of the same set, and wherein the roller carriers of the two sets can be moved towards or away from one another by eccentric drives.

As is known, it is difficult to form a mixed batch of dough, the volume of which can vary in size, but mostly is equal to the kneading capacity, and which is usually fed from a hopper, into a continuous dough band which has a predetermined width and an equally predetermined, at least to some extent has constant thickness. These difficulties arise from the fact that mixed dough is sensitive to the stresses that arise when it is formed into a continuous band in terms of its structure, i.e. its physical and chemical properties. This applies in particular to doughs that have a long fermentation time, which is desired in terms of increasing the quality of the product without additional effort (additives).

A device of the type described at the outset has now become known (EP 744 126 A1), in which each set of rollers is rotatably mounted on a pivot lever forming the roller carrier. This pivot lever is articulated at its upper end to the frame and can be pivoted about this articulation point by the eccentric drive. The two roller carriers are always pivoted in opposite directions, so that the gap through which the shaped dough strand emerges from the bottom of the device is alternately enlarged and reduced. Although this allows a continuous strand of dough of a reasonably constant thickness to be achieved, this known device is not completely free of undesirable stresses on the dough, so that damage to the dough structure occurs in particular with sensitive types of dough or dough after a long fermentation time.

The object of the invention is to improve a device of the type described at the outset in such a way that the dough is brought into the desired band shape in a particularly gentle manner. The invention achieves this object in that an eccentric is mounted on each roller carrier, which is driven to rotate in the opposite direction to the direction of the dough, and in that each roller carrier is mounted on a further eccentric or connecting rod at a location higher or lower than this eccentric, this further eccentric or this connecting rod is rotatably or pivotably mounted on the frame. In contrast to the pivoting movement of the two roller carriers occurring in the known construction described above, the subject of the invention involves a movement of each roller carrier which not only contains a horizontal component, but also a clear vertical component, this horizontal or vertical component not only in the lowest rollers the role carrier occurs, but also in the top roles. This results in a wave motion of the two roller carriers, so to speak, so that the dough between the two roller sets not only has a thrust effect due to the circumferential movement of the rollers, but also a pumping effect, the size and type of which depends on how large the eccentricity of the eccentric used is or how long the connecting rods are used and how and where they are articulated on the respective roller carrier. To put it simply, it can be said that the dough is rolled gradually and gently into the desired shape.

In contrast to the known construction described above, according to the invention the eccentrics act directly on the respective roller carrier, whereas in the known construction the pivotable roller carrier is connected to an eccentric pin of the drive via a connecting rod.

According to a development of the invention, the rollers of the two roller sets have the same diameter, which lowers the production costs and makes it easier to adjust the different speeds and the thrust and pump effects caused thereby on the dough as desired.

According to a particularly advantageous development of the invention, each roller carrier is formed by two walls that laterally delimit the gap. The ends of the rollers can be mounted in these walls, for example by means of bearing pins, and the drive elements for the rotational movement of the rollers can also be held by the roller carriers. With such a construction, the walls forming the roller supports can form the lateral boundary for the dough that flows through the gap between the roller sets and thus determine the width of the dough sheet to be produced as side panels, if this has not already been done, e.g. through the outlet cross section of a hopper or the like.

According to a development of the invention, the eccentric (s) or the connecting rod (s) can be adjustable. This adjustability can include a change in the eccentricity of the eccentric and / or a change in its bearing point and / or a change in the length and / or the articulation points of the connecting rod. In this way, the movement of the roller carrier and thus the effect of its rollers on the dough can be varied, so that one can adapt to different dough qualities, which is particularly important for processing differently viscous doughs.

It is particularly useful above that of the driven roller sets limited gap next to the uppermost rollers, two further sets of freely rotatable, stacked rollers next to each other, preferably the gap delimited by these two roller sets is at least as wide as the average width of the gap delimited by the driven roller sets. The space between these further roller sets forms a compensation space for a quantity of dough which lies between the driven roller sets carried by the roller carriers and is pushed up during the movement of these roller sets and thereby extends beyond the uppermost rollers of the two driven roller sets. This pushed-up amount of dough is taken up by the above-mentioned compensation space and released again as soon as the driven roller sets move away from each other again. It is expedient to arrange the rollers of each of the further roller sets one above the other in the vertical direction and to dimension them the same size, but to keep the diameter of the rollers of these further roller sets smaller than that of the driven rollers. As is known, it is often desirable to introduce one or more flowable substances onto or into the dough. Such substances can be, for example, baking oil, separating oil, olive oil, but also egg white, honey, sugar solution or oxygen or fermentation gases to influence the properties of the dough, further humectants, especially water, as preparation for subsequent sprinkling or dusting, e.g. with poppy seeds, sesame etc. , or caustic soda for the production of savory biscuits, gloss for the production of brioche, substances (in particular oils) to improve taste, etc. The invention offers the possibility of such a loading of the dough with the flowable material in the course of passing the dough through the intermediate the gap located in the driven roller sets. For this purpose, according to the invention, at least one roller is designed with at least one channel running in its longitudinal direction for the supply of a flowable medium to the dough, the roller jacket surrounding this channel being designed as a sintered body which is permeable to this medium. The medium to be applied to the dough can flow through or diffuse through this sintered body, if desired the working medium applied to the dough can be incorporated into the dough by the stresses exerted by the roller sets. It is advantageous that a much more uniform application of the medium to the dough can be achieved in this way than was previously possible by the usual dripping on or spraying on the medium. Furthermore, the losses are significantly reduced, since the medium can be applied to the dough with the rollers completely exactly and therefore nothing or almost nothing escapes from the rollers past the dough. This results in precise metering of the amount of medium to be applied to the dough and avoiding contamination of neighboring machine parts. Furthermore, this application is more flexible with regard to different types of medium to be applied and more precisely with regard to the local application.

For rolls designed in the above sense, sintered bodies made of food-safe, dough-repellent material, preferably polyamide, are recommended according to the invention. The average molecular weight for this is suitable to be chosen, e.g. about 800 to 1200, preferably about 1000, the sintering volume being 60 to 90% (corresponding to a void content of 40 to 10%). Sintered bodies made of sintered plastic granules with an average grain size of 0.2 to 1.0 mm are particularly suitable in the context of the invention.

Further characteristics and advantages of the invention result from the description of exemplary embodiments, which are shown schematically in the drawing. Fig. 1 shows an embodiment in vertical section. FIG. 2 shows the driven roller sets used in the construction according to FIG. 1, which are mounted in the roller carriers, on a larger scale. Fig. 3 is a section along the line III-III of Fig. 2. Fig. 4 shows an embodiment variant of Fig. 2 and Fig. 5 is a section along the line VV of Fig. 4. Figs. 6 to 9 show in sections similar to FIGS. 2 and 4 further variants. 10 and 11 show two variants for the adjustment of the gap between the two sets of rollers. 12 shows in vertical section the supply of a flowable medium to the rollers and FIG. 13 is a section along the line XII-XII of FIG. 12.

In the embodiment according to FIGS. 1 to 3, the dough to be processed, which can have a long fermentation time, for example kettle cooking, is filled from above into a filling funnel 1, the capacity of which suitably corresponds to the nominal capacity of the kneader through which the dough was previously edited. The hopper 1 is placed on the machine frame 2 and has an outlet opening 3 at the bottom, the width of which, measured normal to the plane of the drawing, already determines the width of the dough strand or band to be produced. From the outflow opening 3, the dough 4 passes between two endless belts 5, 6, which are guided over rollers 7, 8, of which the rollers 7 are driven in such a way that the two belts 5, 6 rotate stepwise or continuously in the direction of the arrows 9 , The two bands 5, 6 are arranged obliquely with their longitudinal extent so that the smaller rollers 8 are below and the vertical axis 10 of the funnel 1 adjacent. The guidance of the belts 5, 6 can be designed by construction parts (not shown here) in such a way that the two lowermost rollers 8 change their position periodically, so that the gap 11 between the two rollers 8 changes its size and / or its position with respect to the axis 10 changes periodically. The dough 4 passes from the gap 11 between two rollers 12 or rollers, which rotate in opposite directions in the direction of the arrows 13 and can be driven in this direction, but need not. The gap 14 between the two rollers 12 first determines the thickness of the dough strand or band emerging from the roller pair 12 and, if desired, its size can be adjustable. The dough belt produced in this way arrives on a conveyor belt 15 which transports the dough 4 to another in the frame 2 of the device attached funnel 16 leads. As a result, the dough sheet fed to the hopper 16 again loses its reasonably uniform thickness, which is, however, restored in a manner described later. The outflow opening 17 of the hopper 16 can - but need not - have a width that corresponds to that of the outflow opening 3 and can determine the width of the dough sheet to be produced. The dough passes from the hopper 16 between two sets of rolls 18, 19, each of which has four rolls 20 of the same size, one above the other in the vertical direction. These rollers are freely rotatable, their circumferences are closely adjacent to one another or even touch one another. The rollers 20 are fixed in place in the frame 2, expediently in side plates adjoining the outflow opening 17.

The roller sets 18, 19 are followed by further roller sets 21, 22, each of which has four rollers 23 arranged one above the other in the exemplary embodiment shown. The rollers 23 of each of the roller sets 21, 22 are supported at their ends designed as shaft ends 69 by means of roller bearings 25 (FIG. 3) on roller carriers 24 which - measured normal to the axial direction of the rollers 23 - are considerably wider than the diameters of the rollers 23, which diameter is appropriate for all rollers 23 the same. In this way, each roller carrier 24 consists of two walls 54 supporting the rollers, which form side plates for delimiting the side of the dough strand, with usually only a narrow gap 26 (FIG. 2) remaining between two roller carriers 24, which the relative movement of the two roller carriers 24 one on the other to or away from each other. The bearings of the rollers 23 in the roller carriers 24 are selected so that in all positions of the roller carriers 24 the distance between two opposing rollers 23 decreases downwards, i.e. in the direction of flow of the dough, so that the flow for the Teiges significant gap 50 between the roller sets 18, 19 tapered down. The dough 4 emerges from the roller chair formed by the two roller sets 21, 22 in the form of a continuous dough belt of constant width and approximately constant thickness and arrives on a conveyor belt 27 which is guided over a roller 29 driven by a motor (not shown), so that it revolves in the direction of arrow 28. This conveyor belt 27 can be used for further processing, e.g. Forming, portioning etc. handed over to the delivery point 30, or these further processing of the dough 4 can be carried out partially or completely on the section of the conveyor belt 27 lying to the side of the roller chair 31.

The rollers 23 of each roller set 21, 22 are driven in the same direction, the direction of rotation is indicated by arrows 32 (Fig. 1, 2). These directions of rotation are directed in opposite directions on the two roller sets 21, 22, so that the dough located between the two roller sets 21, 22 is conveyed downward by the rollers 23. Each roller set 21, 22 is driven by a motor 33 (FIG. 3), which drives chain wheels 35 via a chain 34, which with the bearing pins 69 of the rollers 23 are rotationally connected. Since the two roller carriers 24 execute a relative movement, a separate drive of this type is expediently provided for the rollers of each roller carrier 24 (FIGS. 6 to 9). However, by means of a suitable translation between chain 34 and sprockets 35, the arrangement is always chosen such that the lower rollers 23 rotate at a higher number of revolutions than the upper rollers 23.

A further movement is superimposed on the described rotary movement of the rollers 23, which is transmitted to the rollers 23 via the roller carrier 24. For this purpose, each roller carrier 24 is driven by an eccentric 36. Each eccentric 36 has an eccentric disk 37 which is rotatably mounted in the frame 2 by means of bearings 38 and carries an eccentric pin 39 which is extended to a rod running in the axial direction of the rollers 23, which connects the two roller carriers 24 lying on both sides of the rollers 23 , This rod-shaped eccentric pin 39 is rotatably mounted in the roller carriers 24 by means of bearings 40. This arrangement is shown in FIGS. 2 and 3. The arrangement can, however, also be reversed, that is to say that the eccentric disks 37 are mounted in the roller carriers 24 and the eccentric pins 39 in the frame 2. In the embodiment shown, the one eccentric disk 37 carries a centrally arranged chain wheel 41 which is connected by a chain 42 from one Motor 43 is driven. The chain 42 runs over a further sprocket 44, which drives a further eccentric 45, the eccentric disk 46 and the eccentric pin 47 of which are mounted in an analogous manner in the frame 2 or in the roller carrier 24, as was described for the eccentric 36.

This mounting on eccentrics 36, 45 is the same for the roller carriers 24 of the two roller sets 18, 19, only mirror-inverted with respect to the axis 48 of the gap 26.

The direction of rotation of the motor 43 or the running direction of the chain 42 is selected such that the eccentric pins 39 and 47 perform a circular orbital movement in the direction of the arrows 49, that is to say counter to the running direction of the dough in the gap 50 between the two roller sets 21, 22. The two eccentric pins 39, 47 are offset angularly relative to one another. 2 shows, the lower eccentric pin 39 has almost reached its highest position, whereas the upper eccentric pin 47 is only at the beginning of its upward movement. This results in the rotation of the eccentrics 36, 45 for the two roller sets 21, 22, a movement superimposed on their orbital movement, which contains both a horizontal component and a vertical component. There is therefore a movement of the two roller sets 21, 22 towards and away from each other and up and down, but the lower rollers 20 of the two roller sets 21, 22 approach or move away from each other the most at another time than the upper rollers 20 of these roller sets. The wobbling movement of the two sets of rollers 21, 22 thus produced results in a pressure or kneading effect on the dough, which, however, is gentle on the dough, so that the dough is gently brought into the desired shape of the dough sheet becomes. This results in a certain braking effect on the dough flowing between the rollers 20, caused by the correspondingly chosen direction of rotation of the eccentrics 36, 45. However, this braking effect is opposed by the promoting effect of the rotating movement of the rollers 20 about their axes, the lower rollers 20 of each roller set 21, 22 rotate faster than the upper rollers of the same roller set. This different rotational speed of the individual rollers 20 can easily be achieved by choosing the size or number of teeth of the chain wheels 35 interacting with the chain 34. Through the interaction of all these movements, the dough is not only pumped through or pressed through the gap 50 which is tapered downward between the roller sets 21, 22, but is also gradually and gently rolled into the desired shape.

The embodiment according to FIGS. 4 and 5 differs from that according to FIGS. 1 to 3 in that connecting rods 51 occur instead of the upper eccentrics. Each connecting rod 51 is pivoted at one end by means of a pivot bearing 52 on the frame 2, with its other end on the relevant roller carrier 24, likewise pivotable. The latter articulation point 53 is expediently chosen such that it coincides with the axis of the top roller 20. In this embodiment, the connecting rods 51 are directed downward from the pivot bearings 52 and against the gap 50. The mode of operation is essentially the same as in the embodiment according to FIGS. 1 to 3. FIGS. 6 to 9 show different embodiments for those components which cause the aforementioned wobbling movement of the two roller carriers 24. The embodiment according to FIG. 6 is basically the same as that according to FIG. 4, i.e. eccentric drive at the bottom and connecting rod bearing at the top, the connecting rods 51 being directed inwards and downwards from their articulation points 52 on the housing 2. The embodiment according to FIG. 7 differs from this in that the connecting rods

51 are directed upwards from their articulation points 52 on the housing 2.

In the embodiment according to FIG. 8, the eccentric bearing is arranged at the top and the connecting rod linkage at the bottom. The connecting rods are directed downwards and inwards from the articulation points on the housing. The articulation point 53 is therefore no longer at the top roller 20 of the respective roller set 21 or 22, but at the bottom roller 20.

The embodiment according to FIG. 9 differs from this in that the connecting rods 51 are directed upward from their pivot bearings 52 on the housing 2.

6 to 9 also schematically show the drives previously described for the rotation of the rollers 20 and the drive of the eccentric 36 or 45 used in each case.

In addition, FIGS. 1, 2 and 6 to 9 show devices with which the mean width of the gap 50 remaining between the two roller sets 18, 19, which is decisive for the flow of the dough, can be changed. This Devices include adjustment drives which act on the two roller carriers 24. For this purpose, in the described embodiments, each roller carrier 24 is provided in its lower region with a toothed rack 55 which meshes with a toothed wheel 56 rotatably mounted on the frame 2. This makes it possible to adjust the two roller carriers 24 in the direction of the double arrows 57. The set position can be locked by fixing elements, not shown.

FIG. 10 shows the adjustment possibility described in the extreme position, in which the two lower sections of the two roller carriers 24 are the closest to each other, so that the gap 50 between the two roller sets 18, 19 has reached its narrowest setting at the bottom. As shown in FIG. 10, the previously described setting option for the width of the gap 50 mainly affects its lower section. If it is desired to also adjust the upper section of the gap 50, a similar adjustment option can also be provided for the upper sections of the two roller carriers 24, as shown in FIG. 11. The adjustment range can extend so far that the edges of the walls 54 forming the roller supports 24 touch each other in pairs, as shown in FIG. 11.

An analog adjustment possibility can of course also be used for the pivot bearing 52 of the connecting rod 51.

It is expedient to provide the adjustment elements described, in particular the toothed racks 55 and the gear wheels 56, in the region of the eccentrics 36 or 45 or the articulation points 52 of the connecting rods 51. If desired or necessary, however, the adjustment drives described for the width of the gap 50 can also act on the roller carriers 24 at other points.

In the embodiment according to FIGS. 12 and 13, a flowable medium can be introduced into individual or all of the rollers 20 of the roller sets 18, 19, which medium passes through the rollers 20 onto the dough. For this purpose, each roller 20 has at least one channel 59 running in its longitudinal direction, expediently arranged in the region of the roller axis 58, in which the flowable medium, e.g. Baking oil, egg white, flavoring solutions, but also oxygen or fermentation gases to influence the properties of the dough, in the direction of arrow 60 from a line 61 via a rotary coupling

62 is initiated. The channel 59 is expediently formed by a hollow shaft 63 made of steel, the end of which is turned away from the rotary coupling 62 is closed. The wall of the hollow shaft

63 has a plurality of radially running openings 64 through which the flowable medium can flow to the jacket 65 of the roller 20. This jacket 65 is expediently provided on its inside with an annular distributor space 66, into which the medium flows in the direction of the arrows 67 and from which it enters the jacket 65. In order to allow the flow through the jacket 65, it consists of a sintered body which is permeable to the medium, advantageously of a dough-repellent material, eg polyamide with an average molecular weight of about 1000, the sintering volume being 60 to 90% (corresponding to a void content of 10 to 40%). Such a porous sintered body can consist of plastic granules with an average grain size of 0.1 to 1.0 mm, for example 0.2 to 0.35 mm. The medium introduced into such a sintered body passes through this sintered body or diffuses through it and thus reaches the peripheral surface 68 of the jacket 65 and thus the dough 4 in contact with this peripheral surface.

Such an application of the medium to the dough 4 is advantageous both with regard to the local application and with regard to the uniformity of the application and the avoidance of contamination of neighboring machine parts.

As shown in FIG. 12, several rollers 20 can be connected together to the line 61, into which the medium to be applied to the dough 4 is fed under pressure by a pump, not shown. An alternative to this is to connect individual rollers 20 to different lines 61 so that different media can be applied in different doses.

As shown in FIGS. 1 and 12, the device formed by the roller sets 18, 19 is located above the roller chair 31 formed by the roller sets 21, 22. The purpose of this is to collect any dough quantities rising upward from the roller chair 31 during the pumping movement of the roller sets 21, 22 and to guide them back into the roller chair 31. For this purpose, the rollers 20 of the roller sets 18, 19 are freely rotatable, the circumferential surfaces of these rollers 20 expediently touch one another in order to prevent the dough from escaping laterally. A similar contact of the peripheral surfaces 68 of the rollers 20 is also given in the embodiment according to FIG. 12, but not mandatory, as shown in FIG. 1, where the individual rollers 23 are at a small distance from one another with their peripheral surfaces.

As shown in FIG. 1, the rollers 20 of the roller sets 18, 19 are arranged next to the uppermost rollers 23 of the roller chair 31. The gap delimited by the roller sets 18, 19 is at least as wide as the average width of the gap 50 of the roller frame 31. The rollers 20 lying one above the other in the vertical direction are equal in size to one another, but their diameters are consistently smaller than the diameter of the rollers 23 of the roller frame 31st

Claims

Patent claims:

1. Device for forming a sheet of dough, with a frame (2) and with two sets (21, 22) arranged next to one another, one above the other, for rotating movement about their horizontal axes driven rollers (23), the

Rollers (23) of each set (21, 22) are rotatably mounted on a roller carrier (24) which is movable relative to the frame (2) and the dough (4) is left to narrow downwards between the two roller sets (21, 22) Nip (26) passes from top to bottom, and wherein all the rollers (23) of a set (21, 22) in the same direction, but the lower rollers (23) of the set (21, 22) faster than the upper rollers (23 ) of the same set (21, 22) are driven, and wherein the roller carriers (24) of the two sets (21, 22) can be moved towards and away from one another by eccentric drives, characterized in that an eccentric (24) on each roller carrier (24) 36, 45), which is driven counter to the direction of rotation of the dough (4) and that each roller carrier (24) is located at a location higher or lower than this eccentric (36, 45) on a further eccentric (36, 45 ) or a connecting rod (51) is mounted, this further eccentric (3rd 6, 45) or this connecting rod (51) is rotatably or pivotably mounted on the frame (2).

2. Device according to claim 1, characterized in that the rollers (23) of the two roller sets (21, 22) have the same diameter among themselves.

3. Device according to claim 1 or 2, characterized in that each roller carrier (24) is formed by two walls (54) laterally delimiting the gap (50).

4. Apparatus according to claim 1, 2 or 3, characterized in that the eccentric (s) (36, 45) or the connecting rod (51) are adjustable, e.g. by changing the eccentricity and / or the bearing point of the eccentric (36, 45) and / or by changing the length and / or the articulation points of the connecting rod (51).

5. Device according to one of claims 1 to 4, characterized in that the connecting rod (51) from its articulation point (53) on the roller carrier (24) is directed obliquely upwards or obliquely downwards.

6. Device according to one of claims 1 to 5, characterized in that two eccentrics (36, 45) lying on both sides of the gap (50) are driven synchronously, but in opposite directions.

7. Device according to one of claims 1 to 6, characterized in that above the gap of the driven roller sets (21, 22) limited gap (50) subsequent to the top rollers (23), two further sets (18, 19) free rotatably mounted, stacked rollers (20) are arranged next to one another, the gap delimited by these two roller sets (18, 19) preferably being at least as wide as the average width of the gap (50) delimited by the driven roller sets (21, 22) ,

8. The device according to claim 7, characterized in that the rollers (20) of each of the further roller sets (18, 19) lie one above the other in the vertical direction and are equal in size to one another.

9. The device according to claim 7 or 8, characterized in that the rollers (20) of the further roller sets (18, 19) have smaller diameters than the driven rollers (23).

10. Device according to one of claims 1 to 9, characterized in that the two roller carriers (24) are adjustable towards and away from each other by additional adjustment drives.

11. The device according to claim 10, characterized in that the adjusting drives on the roller carriers (24) have fixed racks (55) which mesh with rotatably mounted on the frame (2) gear wheels (56).

12. The device according to one of claims 1 to 11, characterized in that at least one roller (23) has at least one channel (59) running in its longitudinal direction for the supply of a flowable medium to the dough and that the roller jacket surrounding this channel (59) (65) is designed as a sintered body permeable to this medium.

13. The apparatus according to claim 12, characterized in that the sintered body made of dough-repellent material, in particular polyamide with a molecular weight of about 800 to 1200, e.g. about 1000, the sinter volume is 60 to 90%.

14. The apparatus according to claim 13, characterized in that the sintered body made of sintered plastic granules with an average grain size of 0.1 to 1.0 mm, e.g. 0.2 to 0.35 mm.