as shown in fig1 a shredding machine 2 is provided for receiving stripping means 1 according to the invention . machine 2 has a flat casing provided with a tearing or cutting tool 3 with substantially identical cutting rollers 4 extending approximately across the entire width of the casing between bearing brackets . the outer circumference of each rollers 4 has ring disk - like cutting disks 5 uniformly distributed over approximately the entire length of the roller . between disks 5 are interposed annular slots 6 , with an only slightly greater width than the cutting disks . the cutting disks 5 of each cutting roller 4 engage in the annular slots 6 of the facing cutting roller 4 such that the cutting disks 5 extend almost to the associated bottoms 7 of the slots 6 . the cutting disks of the cutting rollers 4 meshing in this way are circumferentially provided with profiling effects , e . g ., slots cutting and tearing teeth , etc ., for producing a particle cut by means of such profiling effects . the slots or teeth appropriately do not extend to the slot bottom 7 and for reasons or simplicity are not shown in detail in fig1 to 3 . the slots , e . g ., can be defined in rectangular manner and can in the circumferential direction have a smaller extension than the intermediate members left behind . the teeth are roughly equal - sided pointed , saw tooth - like forms with sloped facets leading in the working direction or truncated on the tooth head . above the roller gap between the cutting rollers 4 issues a funnel - shaped , constricted shaft defined by the casing cover , for introducing material to be processed . the shaft extends over the working width of the cutting rollers 4 and is provided for introducing the material to be comminuted , e . g ., one or more layers of paper . for each cutting roller 5 , the stripping means 1 has a number of strippers 8 , 9 or 10 , 11 substantially precisely corresponding to the number of annular slots 6 , so that there is a single stripper engaging in each annular slot 6 . all the strippers are reversible and interchangeable , having plates and approximately t - shaped stripping bodies . the strippers , for example , are sheet metal stamped parts , appropriately having the same thickness as the cutting disks 5 and therefore engaging with the associated annular slot 6 with a very small clearance of only a few tenths of a millimeter . the strippers 9 to 11 are fixed relative to the casing . in the main working rotation direction according to arrow 12 , the cutting rollers 4 rotate with respect to the fixed strippers 9 to 11 so that the circumferential surfaces of the rollers 4 move downwards in the vicinity of cutting zone 14 . the rollers rotate in the opposite direction according to arrow 13 in the reversing direction . strippers 8 , 9 or 10 , 11 of the particular cutting roller 4 are in each case arranged in two separate groups 15 , 16 of separately mounted strippers . the groups alternate such that a stripper 8 or 9 of one group 15 or 16 engages in an annular slot 6 and a stripper 9 or 8 of the other group 16 or 15 engages in an adjacent annular slot 6 . in each case the particular annular slot 6 is free of strippers over its remaining circumference and at least up to the cutting zone . strippers 8 , 9 or 10 , 11 of the two groups 15 , 16 of each cutting roller 4 are reciprocally displaced around the associated roller axis relative to one another by an angle of at least 30 ° to 60 ° and preferably at least approximately 90 °, so that the strippers act on circumferential areas of the particular cutting roller 4 which are spaced at a distance along an arc . adjacent strippers 8 , 9 or 10 , 11 of the particular group 15 or 16 have in each case an inside spacing with respect to one another corresponding to the width of a specific number of annular slots 6 , plus the thickness of a number of cutting disks 5 , increased by one compared with said number . in the represented embodiment this spacing is the same as the width of an annular slot , plus the thickness of two cutting disks 5 . the central spacing between adjacent strippers consequently corresponds to the disk - to - disk pitch spacing or to an integral multiple of the longitudinal pitch or division of the particular cutting roller . appropriately , all the spacings are identical , but the spacings can also alternate or be made similar . in the area of each group 15 , 16 of strippers , there is a gap between adjacent strippers , the gap extending over at least one annular slot 6 and the flanking cutting disks 5 . as shown in fig2 passage gap 17 is thus formed for the material , substantially completely limited over its circumference and which is laterally bounded by the adjacent strippers 8 or optionally the flanking cutting disks 5 , the associated slot bottom 6 and the support arrangement for the strippers . the gap 17 as shown in the view according to fig2 is , for example , approximately t - shaped . as a result of the curved surfaces of the cutting roller and the facing boundary surface of the support arrangement , the passage gap 17 tapers in funnel - shaped manner from the two inlet or outlet sides towards its center . the particular passage gap 17 is then followed in the circumferential direction by the associated stripper of the other group , so that the passage gaps , with respect to the annular slots 6 , alternate corresponding to the strippers . in order that the material has completely left the strippers 8 of the upstream group before reaching the next group of strippers 9 in the working rotation direction , there is an adequately large inside distance along the arc or arc spacing 18 between the strippers 8 , 9 or 10 , 11 of the two groups 15 , 16 . the spacing 18 can be much smaller than the circumferential extension of a stripper and can , e . g ., be between a few radians and a maximum slightly more that 45 °. each of the approximately t - shaped strippers 9 to 11 , has a central or symmetry plane substantially located in an axial plane of the associated cutting roller 4 . each t - shaped stripper forms with the transverse t - web at the top of its t - shape a concave inner face 21 , curved around the associated roller axis . inner face 21 is located at a relatively small spacing with respect to the associated slot bottom 7 and has approximately the same curvature as the slot bottom . this inner face 21 passes into end faces 22 , which are parallel to one another , approximately parallel to said axial plane . as the ends of the t - transverse web or member , inner face 21 forms with end faces 22 on either side of the stripper in each case one stripping edge 23 or 24 , which is bounded in acute - angled , like a paring edge . the stripping edges 23 directed counter to the main working rotation direction ( shown by arrow 12 ) are effective during the normal operation of cutting tool 3 . the oppositely - directed cutting edges 24 are mainly effective during reverse operation . the mounting or securing of the strippers is accomplished such that they are tiltable to a limited extend about an axis parallel to the associated roller axis and spaced from the roller circumference . therefore , the particular effective stripping edge 23 or 24 under the loads which occur is drawn in self - adjusting manner against the associated slot bottom 7 and consequently at least approximately acts to scrape the slot bottom . the arc spacing of the two stripping edges 23 , 24 of each stripper 9 to 11 is appropriately between approximately 30 ° and 120 °, preferably approximately 90 ° or slightly smaller . strippers 8 , 9 or 10 , 11 of each group 15 or 16 are mounted in packet - like manner in closed constructional units , in each case on two cylindrical supporting rods 27 . the ends of supporting rods 27 are fixed on the casing or on the associated bearing brackets of cutting rollers 4 . the two supporting rods 27 are located in the associated axial plane of cutting roller 4 , radial to the same and in successive manner . supporting rods 27 traverse bores in the t - foot portions of the strippers , which can have limited bearing play with respect to the supporting rods 27 for said limited tilting capability . all the groups of strippers can be formed by identical , corresponding constructional units and are therefore interchangeable . between adjacent strippers , rectangular , plate - like spacers 25 are arranged with corresponding bores on supporting rods 27 . the external dimensions of said spacers 25 are slightly smaller than the corresponding external dimension of the t - foot portions of the strippers , so that on all sides the spacers are set back with respect to said outer edges . the side of each spacer 25 facing the particular cutting roller 4 forms a planar guide surface 26 as a corresponding boundary of the associated passage gap 17 . the planar guide surface 26 is approximately tangential to the circumference of the associated cutting roller 4 . the material passing through the passage gap 17 is drawn along surface 26 into the passage gap 17 and then moved out again . the stripping edges 23 of the corresponding groups 15 of strippers 8 , 10 located closest to the narrowest point of cutting zone 14 have , with approximately 50 °, a smaller arc spacing from said narrowest point than the stripping edges 24 of the other group 16 pointing in the opposite direction and next to said narrowest point . therefore the first mentioned stripping edges 23 are very rapidly reached by the material after passing out of the cutting zone 14 . the material is then removed from the annular slot 6 by said stripping edges 23 and between the two groups 15 of strippers 8 , 10 is led substantially vertically downwards , the associated , faces 22 of said strippers 8 , 10 acting as guide faces . strippers 8 , 10 have a greater spacing than the slot depth of the annular slot 6 from the median plane of the cutting zone 14 approximately at right angles to the common axial plane of cutting rollers 4 , particularly roughly twice as large . thus , the two material flows 28 led away from these stripping edges 23 , as indicated by the dot - dash arrows in fig1 are led downwards in spaced manner from one another . the material flows 29 located between material flows 28 in the roller longitudinal direction are removed from the associated annular slot 6 by the stripping edges 23 of the strippers 9 , 11 furthest from the cutting zone 14 in the circumferential direction . these flows 29 are consequently dropped downwards at a much further horizontal spacing from the median plane of cutting zone 14 . the guide faces formed by the approximately horizontal end faces 22 of strippers 9 , 10 , as a result of the described construction , are located approximately in the horizontal direction or at right angles to the median plane of cutting zone 14 . these end faces are at a distance from the corresponding upright guide faces 22 of the other strippers 8 , 10 of the associated cutting roller 4 which distance can be approximately half the internal diameter of the annular slot 6 , is appropriately larger than the same , and is preferably approximately at least 3 / 4 of said internal diameter . a guide body is preferably provided in the movement area of the material flows 28 , 29 leaving the cutting zone 14 or the cutting rollers 4 and the guide elements formed by strippers 8 to 11 . the guide body is provided for at least one of the two outer material flows 29 , and may include a guide plate 30 , with an inclined guide face , which appropriately faces the median plane of cutting zone 14 . guide plate 30 is struck by material flow 29 during its downward movement in such a way that flow 29 is correspondingly directed away in sloping manner . thus , material flow 29 can be wholly or partly moved towards the central material flows 28 again , so that the particles of said material flows in part mix , at the latest on reaching a lower collecting point . a lower collecting point can in simple manner be formed by a container , flexible bag or the like , fastened to the bottom of the shredding machine or the casing , the guide plates 30 appropriately projecting beyond the underside of the casing , and being open in the vicinity of cutting tool 3 . in the embodiment according to fig1 and 2 , the median planes of strippers 8 , 10 of the lower groups 15 are approximately parallel to one another and parallel to the median plane of cutting zone 14 , i . e ., vertical in the present case . the median planes of strippers 9 , 11 of the upper groups 16 are aligned with one another and are approximately in the common axial plane of cutting rollers 4 , i . e ., approximately horizontal in the present case . accordingly there is an average arc spacing between the two groups of approximately 90 °. as a function of the circumferential extension of the strippers , this arc spacing can also be smaller or , as illustrated by arc spacing 19 in fig3 larger , for example approximately 135 ° or more , e . g ., approximately 180 °. the inside arc spacing 18a is approximately 45 ° in this embodiment . the arc angle over which the particular stripper 8a or 9a extends in the circumferential direction is designated 20 in fig3 . otherwise the same numerals are used in fig3 as in fig1 and 2 , but are followed by the letter &# 34 ; a &# 34 ;. all the strippers 9 to 11 form in the embodiments shown in fig1 to 3 so - called primary strippers , because their stripping edges 23 or 24 during the particular rotation direction of the cutting rollers 4 are the first and only ones which are reached by the material received in the associated annular slot . based on the working rotation direction , it is conceivable to provide behind the particular primary stripper or stripping edge a secondary stripper or stripping edge for the associated annular slot .