Abstract: A pre-comminuting and metering apparatus, particularly for large plants for shredding paper and similar waste materials. The apparatus includes a pair of cutting rollers arranged at the bottom of a hopper. The cutting rollers are driven in opposite directions and are provided with toothed knife disks. Each knife disk has an inclined circumferential surface defining outermost circumferential edges, wherein the knife disks of the cutting rollers are arranged in pairs and the outermost circumferential edges of each pair of knife disks contact each other. The pairs of knife disks are arranged spaced apart from each other in axial direction of the cutting rollers. The teeth of the knife disks are formed by undercut portions. The undercut portions of the knife disks of each cutting roller are arranged helically offset relative to each other.

Abstract: A paper shredder includes a cutting unit with cutting rollers and a feed table arranged in front of the cutting unit. A conveyor belt for waste material or paper to be comminuted is mounted in the feed table. The conveyor belt extends into an intake gap of the cutting roller. The front end of the conveyor belt formed by a guide roller is mounted spaced from stripping members of the cutting rollers and this distance is bridged by a guide unit for the waste material or paper.

Abstract: A baling press for automatically and mechanically placing and binding one or more binding wires around highly compressed bales of waste material. The baling press includes for each binding plane a separate feeding station, cutting station and twisting station on the opposite side of the pressing shaft. The feeding elements are not mechanically or positively connected to each other. Rather, the feeding elements are all connected to the same pulse generator for carrying out the control of the feeding elements.

Abstract: Protective cover for a combined shredder and compactor. The protective cover is adapted to assume a position to limit access to the cutter of the shredder when the shredder is operating.

Abstract: A drive unit for a knife roller of a shredder having an electric motor to which a motor reduction gear transmission is attached. Recesses are located on both sides of the plane sides of the intermediate gear wheel. Each of the stop surfaces, which are located across from each other, work in cooperation with the in corresponding catch pin on the corresponding free shaft end of the knife roller drive shaft. The stop surfaces and their catch pin represents a free wheeling clutch for forward and reverse start up. There are two catch pins with each their own stop surfaces on each side of the gear wheel.

Abstract: A grooved knife roller for paper shredders. The knife roller has helically extending grooves, wherein the lagging side of each groove in the direction of rotation of the roller and the circumferential surface of the roller include an acute angle to form a hook-like sharp point facing in circumferential direction for cutting paper material in the longitudinal and transverse directions thereof. The lagging side of the groove in the direction of rotation of the roller is rectilinear and is inclined so as to be directed against the direction of rotation of the roller. A transition portion of the groove immediately adjacent the lagging side of the groove is arc-shaped.

Abstract: In a cutting mechanism for shredders fabricated in compact construction it is provided as far as the arrangement of support rods for the wipers is concerned, that within each of the pair of wipers (3, 4) the base parts (3a,4a) approach each other to such an extent that the second support rod (6) located there serves as a common support rod (6) for the one (3) as well as the other (4) of the respective pair of wipers (3, 4).

Abstract: In a cutting mechanism for a document shredder a pair of cutting rollers are disposed in side-by-side relation with disk-shaped circular cutters spaced apart on the rollers. Adjacent circular cutters form annular grooves between them so that the circular cutters on one roller extend into the annular grooves on the other. Wiper plates are located in the annular grooves between the cutters and are arranged in a row extending in the axial direction of the rollers. The wiper plates have tips arranged in a pointed manner with the tips located at the outer circumferential surface of the roller cores. Further, strip-shaped support rods maintain the wiper plates adjacent to the cutting rollers and resting in a positively locked manner on the outer circumferential surfaces of the circular cutters. Each support rod has a pointed tip which engages into an undercut groove in a radially outer surface of each wiper plate.

Abstract: In a channel press for producing bales, preferably tied, of non-metallic waste materials, such as office waste and the like, a press piston is reciprocably mounted in a press channel or shaft into which the waste material is introduced. A knife member is mounted on and is movable with the press piston. A stationary counterknife member is located in the press channel. At least the stationary knife has individual teeth each formed with a point. The teeth are located along a line directed oppositely relative to the line of the cutting edge of the movable knife member.

Abstract: A paper shredder is arranged with a pair of cutting and tearing roller members mounted on bearing members which include semicylindrical recesses within which the roller members are engaged, a pair of support arms which extend from the roller members in the intake direction of the material to be shredded at diverging angles relative to each other, with two pairs of shafts being provided for each of the support arms of the bearing members, the pairs of shafts having longitudinal axes which extend parallel to the axes of the roller members and which are spaced apart a distance taken in the intake direction of the material to be shredded.