Abstract: The invention relates to a method for the operation of a gear or profile grinding machine (1) for the grinding of pre-geared or pre-profiled workpieces (2), wherein the machine comprises at least one tool spindle (3) which can carry at least one grinding tool (4) and wherein the machine comprises at least two workpiece spindles (5, 6) which can at least temporarily be driven to the tool spindle (3) for cooperation of the workpiece (2) with the grinding tool (4). To improve the ratio between primary processing time and secondary processing time the invention proposes that the at least two workpiece spindles (5, 6) are pivoted around a respective axis of rotation (7, 8) for transportation from a grinding position (I) to a loading station (II) and vice versa, wherein the rotation of the two workpiece spindles (5, 6) takes place independently from another. Furthermore, the invention relates to a gear or profile grinding machine.

Abstract: The invention relates to a method for the operation of a gear or profile grinding machine (1) for the grinding of pre-geared or pre-profiled workpieces (2), wherein the machine comprises at least one tool spindle (3) which can carry at least one grinding tool (4) and wherein the machine comprises at least two workpiece spindles (5, 6) which can at least temporarily be driven to the tool spindle (3) for cooperation of the workpiece (2) with the grinding tool (4). To improve the ratio between primary processing time and secondary processing time the invention proposes that the at least two workpiece spindles (5, 6) are pivoted around a respective axis of rotation (7, 8) for transportation from a grinding position (I) to a loading station (II) and vice versa, wherein the rotation of the two workpiece spindles (5, 6) takes place independently from another. Furthermore, the invention relates to a gear or profile grinding machine.

Abstract: The invention relates to a hard finishing machine (1). The machine has one tool (4) which is arranged on a tool spindle (3) and a rotary table (5) with an axis of rotation (6) which is aligned vertically, and a workpiece spindle (7) arranged on the rotary table (5) which carries the workpiece (2). To increase the flexibility of the machine, the rotary table (5) has a first rotational position (I) in which the workpiece (2) can be machined by the tool (4), a second rotational position (II) where the workpiece is loaded on the workpiece spindle (7) at a first station (8), and a third rotational position (III) where the workpiece is unloaded at a second station (9).

Abstract: The invention relates to a hard finishing machine (1). The machine has one tool (4) which is arranged on a tool spindle (3) and a rotary table (5) with an axis of rotation (6) which is aligned vertically, and a workpiece spindle (7) arranged on the rotary table (5) which carries the workpiece (2). To increase the flexibility of the machine, the rotary table (5) has a first rotational position (1) in which the workpiece (2) can be machined by the tool (4), a second rotational position (II) where the workpiece is loaded on the workpiece spindle (7) at a first station (8), and a third rotational position (III) where the workpiece is unloaded at a second station (9).

Abstract: An audio system for vehicles, in particular for motor vehicles, comprises a device component (A) permanently fixed to the vehicle, and a mobile component (B) connected to the device component in a mechanically detachable way. The device component further comprises a control unit (1), and the mobile component further comprises a transponder for storing a numerical code. The function of the audio system is interrupted when the mobile component is removed from the device component, and resumed, following an authorization check, when the mobile component (B) is replaced. The authorization check is performed by the control unit which further comprises a comparator unit (2) for comparing the numerical code transmitted by the transponder (T) with a security code previously stored in the device component.

Abstract: A device for limiting access to authorized users, for example, a vehicle access limiting device, includes a control device and a key device. The control device has memory wherein a preset user code and a preset secret code are stored. The key device has a transponder which includes a memory for storing the user code and the secret code transferred from the control device. The transponder emits the user code which has been encoded with the transferred secret code. The control device includes a comparison device which allows access only when the encoded user code emitted by the transponder agrees with preset information stored in the control device. The key device also includes a comparison device which prevents overwriting of the taught secret code unless it also receives the taught user code.

Abstract: The invention relates to a device for checking the user authorisation for access control devices, in particular locking devices for vehicles. The information emitted by the respective transponder (T1 . . . Tn) in key devices (B1 . . . Bn) in each case is compared to preset information, fixed by the secret code, in the control device, relevant for the respective key device (B1 . . . Bn), whereby(a) the relevant secret code for the respective key device (B1 . . . Bn) is stored, by learning it from the control device (A);(b) the information emitted by the respective transponder (T1 . . . Tn) comprises user code information encoded according to the learned secret code;(c) the control device (A) comprises a further memory means (M) in which the number of the key devices (B1 . . . Bn) taught by the control device (A) is stored; and(d) the key devices (B1 . . . Bn) comprise further memory means (M1 . . .