Abstract: The invention relates to a method and an apparatus for producing a workpiece with internal toothing, especially an internal geared wheel, by using a cup shaped preform (N) with a substantially cylindrical side wall (N1) and a mandrel (5) with an external profile (6) according to the internal toothing to be produced, as well as with a forming tool which reduces the outside diameter of the cylindrical side wall during an advancing movement, as a result of which the material of the cylinder wall region flows into the external profile (6) of the mandrel (5). In accordance with the invention, the forming tool is configured as a drawing ring (14) ensuring the ironing of the cylinder wall region (N1) during an advancing movement and that two tool elements act upon the preform (N) during the ironing, which tool elements produce axial compressive stresses in the cylinder wall region (N1) of the preform.

Abstract: The invention relates to a hydromechanical clamping device having two movable die halves and two punches, a first hydraulic piston, and a second hydraulic piston. The second die half is fixed to the frame and the second punch is arranged on the second hydraulic piston. The first hydraulic cylinder is connected to a third hydraulic cylinder. The latter acts on a fourth hydraulic piston. The first hydraulic cylinder is connected to the third hydraulic cylinder, so that the pressure medium displaced from the first hydraulic cylinder during a feed movement flows into the third hydraulic cylinder and the third hydraulic piston moves the fourth hydraulic piston in the feed direction, so that pressure medium is displaced into the second hydraulic cylinder, and the requisite forming pressure can be applied to the second hydraulic piston and the punches move toward one another.

Abstract: The invention relates to a recording or reproduction apparatus with a holding and removing device for disc-type recording media which facilitates the emplacement and removal of the recording medium. According to the invention, the holding and removing device is formed by a cover of the hub of the disc turntable, by means of which, during the emplacement or removal of the recording medium, the holding force with which a recording medium is held on the disc turntable is reduced. The loading on the recording medium during emplacement or removal is thereby advantageously reduced and the special configuration of the cover as restoring means has the result that no additional individual parts are necessary. In an advantageous manner, the recording medium is both held and centered on the disc turntable with a force which is greater than a resistance encountered by the recording medium during emplacement or removal.

Abstract: The invention relates to a hydromechanical clamping device having two movable die halves (M1, M2) and two punches (S1, S2), a first hydraulic piston (K1) being mounted in a displaceable manner in an axially movable first hydraulic cylinder (Z1), and a second hydraulic piston (K2) being mounted in a displaceable manner in a second hydraulic cylinder (Z2). The second die half (M2) is fixed to the frame and the second punch (S2) is arranged on the second hydraulic piston (K2). According to the invention, the first hydraulic cylinder (Z1) is connected to a third hydraulic cylinder (Z3), in which a third hydraulic piston (K3) is mounted. The latter acts on a fourth hydraulic piston (K4), which is guided in a fourth hydraulic cylinder (Z4).

Abstract: The invention relates to a method and an apparatus for producing a workpiece with internal toothing, especially an internal geared wheel, by using a cup-like preform (N) with a substantially cylindrical side wall (N1) and a mandrel (5) with an external profile (6) according to the internal toothing to be produced, as well as with a forming tool which reduces the outside diameter of the cylindrical side wall during an advancing movement, as a result of which the material of the cylinder wall region flows into the external profile (6) of the mandrel (5). In accordance with the invention, the forming tool is configured as a drawing ring (14) ensuring the ironing of the cylinder wall region (N1) during an advancing movement and that two tool elements act upon the preform (N) during the ironing, which tool elements produce axial compressive stresses in the cylinder wall region (N1) of the preform.

Abstract: A rack drive contains a suspension tooth element which is formed by a rack which has a guide opening parallel to its row of teeth. The rack opening is guided on a bearing bolt of the drive pinion for the rack. The suspension tooth element is preferably connected via a drive pin to a device which can be variably positioned and is produced integrally from an acetyl polymer. The rack drive can advantageously be used as a positioning device for controlling a scanning and/or recording device in a recording and/or playback unit for optical recording media but is not limited to such.

Abstract: A turntable for disc-shaped records includes a disc-centering hub for engaging a centering aperture in the disc-shaped record. A bushing is coaxial with the disc-centering hub and connects the turntable to a driving mechanism. A circular part connects the bushing to an annular outer bearing surface. The annular outer bearing surface has a step portion forming a shoulder normal to the bearing surface and imbedded in the edge of the circular part. The shoulder rises above the circular part to support the disc-shaped records above the circular part by the hub and the bearing surface.

Abstract: A price-calculating scale for self-service use equipped with an input keyboard with key fields provided with pictographs of goods, the price per kilogram of which is entered in the scales by means of the appropriate key field. For the purpose of adaptation to the current type of goods to be priced, an exchangeable key pads having a varied arrangement of the key fields is provided. The scale is programmable to automatically adapt to each key pad.

Abstract: A visual display apparatus comprises a multisegment bar display (2) having display characters (16) divided into two groups. In the first group individual outer segment bars (17) are each associated with a respective permanent marking which indicates a specific information item or class of information items, and are connected in a closed cycle whereby the instantaneously actuated display can be advanced forward or backward in the closed cycle from one segment bar (17) to another by keys (4,5). A sequence of display patterns representing parameter values is displayed in the second group of display characters (16), which sequence and which set depends on the segment bar (17) which is instantaneously actuated in the first group, and a desired parameter value can be selected from among the sequence by depressing an "acceptance" key (6).

Abstract: A balancing scale or electromagnetically compensated weighing apparatus has an independently actuatable and temperature-sensitive magnetic device for balancing a load member; the magnetic device forms a magnetic circuit, and includes a temperature-sensitive corrective device affecting the circuit in at least two locations, so as to substantially temperature-compensate the magnetic circuit over a predetermined temperature range.

Abstract: The damping arrangement includes a cylinder with various diameters in order to first attain a slow movement of the piston through the restricted position and to cause it to move faster through the enlarged portion. Such movement controls the lowering speed of the platform onto the knife edges and the slower movement is present until the platform comes into contact with the knife edges thereby preventing a damage of the knife edges.

Abstract: An electronic scale apparatus for use in determining the net weight of an object placed on a weighing scale features selecting means operable for generating a digital signal corresponding to the dead weight of the object, digital to analog conversion means coupled to the selecting means and operable for producing a first analog signal corresponding to the digital signal, the weighing scale being operable for producing a second analog signal corresponding to the gross weight of the object, a differential amplifier coupled to the conversion means and to the weighing scale and being operable for producing a third analog signal substantially equal to the difference between the first and second analog signals, whereby the third analog signal represents the net weight of the object.