Abstract: A workplace document shredder is located with its cutting mechanism, gear and electric motor in a self-supporting, integral casing which carries all the functional parts and circumferentially surrounds the same. The bearings of the cutting rollers are contained in bearing inserts, which are inserted from above in corresponding recesses of the casing. A container made from easily manufacturable material, such as corrugated paper, carries the apparatus and a hood is placed over it.

Abstract: In a document shredder (1) each tool roller (7, 11) has two tool strippers (8, 9 or 12, 13) with in each case at least one support rod (15) and associated stripping bodies (28), so that two rows of stripping bodies (28) are provided in spaced manner in the circumferential direction of the tool roller (7, 11). In the vicinity of at least one longitudinal area of the tool roller (7, 11) particularly prone to bending deformation in place of the stripping body (28) is provided a support body (30), which positively connects the support rods (15) of two tool strippers (8, 9 or 12, 13) and the tool rollers (7, 11) and which can also act as a stripper. As a result of the frame-like locking of the tool roller and the support rods a significant stiffening occurs, which makes it possible to give smaller dimensions to the tool roller (7, 11) and/or the support rods (15).

Abstract: A workplace document shredder is located with its cutting mechanism, gear and electric motor in a self-supporting, integral casing, which carries all the functional parts and circumferentially surrounds the same. The bearings of the cutting rollers are contained in bearing inserts, which are inserted from above in corresponding recesses of the casing. A container made from easily manufactureable material, such as corrugated paper, carries the apparatus and a hood is placed over it.

Abstract: A document shredder (11) has a cutting mechanism (13), which is driven via a gear (25) by an electric motor (26). In the return movement a diode (30) is connected in, which reduces the voltage supplied to the motor and therefore its maximum torque.This avoids material being jammed on the top of the cutting mechanism during the return movement in such a way that the cutting mechanism cannot be rotated again during the following forward movement.

Abstract: A cutting mechanism (11) for torsion cut has two cutting rollers (12, 13), cutting disks (14, 15), which in each case have a steep cutting face (22) and a sloping back face (23). The transitions between the latter and the roller body are generously filleted and the ratios between the cutting disk spacing, height, etc. are such that the opening (29) for the cut strips (28) has a compact and well rounded shape, so that the strips do not tend to get caught.

Abstract: For shredding EDP printouts in the form of zig-zag-folded web stacks, a feed mechanism is provided, which has several compartments rearwardly inclined somewhat with respect to the vertical. The webs are removed from the stacks standing therein via the web guide formed by the leading edge of the compartment. A projection formed by a wire crossbeam holds back the stack if it is drawn upwards during removal.

Abstract: The cutting tool (3) formed by two cutter blocks (7) of a shredding machine has a stripping means with two stripping grids (10) located between the cutter blocks (7) and two stripping plates (11) located outside the cutting zone and which in each case engage in the gaps (9) between the cutting disks (8) of the cutter blocks (7). The stripping plate (11) associated with each cutter block (7) by one-piece construction is constructionally combined with the associated stripping grid (10), so that there is a very precise alignment of the stripping plate (11) with respect to the stripping grid (10) and all the stripping plates (11) and all the stripping grids (10) can be secured with common supporting plates (30).

Abstract: In a stripping means for shredding machines or the like with spaced interleaved cutting disks (5), primary strippers (8, 9 or 10, 11) closest to the cutting zone engage in a circumferential zone of the associated cutting roller (4), but only in every other annular slot (6). The intermediate annular slot (6) is occupied by strippers (9, 8 or 11, 10) at another circumferential zone of cutting roller (4). An advancing load of comminuted material does not simultaneously strike all the primary strippers over the entire roller length for stripping. Instead, the load strikes the strippers in time succession. The primary strippers form guide elements through which adjacent material flows (28, 29) of the comminuted material are spaced and then can optionally be brought together again for mixing purposes. As a result it is much more difficult to re-associate parts of the material flows or the particles forming the flows in attempting to recover the position of the comminuted parts in the non-comminuted original.

Abstract: A cutting tool for shredding machines has two cutting rollers meshing with cutting disks, which have "tooth on tooth" aligned, forwardly tilted, sloping sawteeth. At their tips, the teeth have notches, so that the tips are twice serrated. The slope of the teeth is such that when they engage in the material to be comminuted they face one another in substantially centrally loaded manner.

Abstract: In an electrically powered machine subject to occasional blockage, the speed, power consumption, torque and/or rate of deceleration are displayed by successive illumination of light-emitting diodes in a row. Predetermined limit values for these parameters alone or summed with one another are defined and optical couplers are positioned at corresponding locations on the row to detect parameters reaching the limits. Detection causes initiation of disconnection, braking, reversal or other means for alleviating the stoppage.