Abstract: A procedure and an apparatus for producing an image based on contrast discrimination in an image forming apparatus with one-dimensional or multidimensional image field.

Abstract: A brake for a substantially light-constructed transport carriage includes a frame part, wheels and a part for drawing the carriage, the draw part being turnably carried in the frame part so that it can be lifted into vertical position to produce a braking effect. The problems encountered in existing brake mechanisms include wear and consequent abundant need of maintenance, and unreliable operation of the brakes. These are solved by arranging in the carriage between the draw means and the wheels, preferably the front wheels, a mechanism by which the front wheels turn in opposite directions when the draw part is lifted into its upper position.

Abstract: A bridge and stopper mechanism for an apparatus for lateral transfer of roller pallets, the apparatus serving to transfer roller pallets and employing bridges as extensions of rails between the shelving and the transporter body, the stopper being placed on the shelving to control the access of roller pallets to the lateral transporter. To reduce the number of hydraulic cylinders and to simplify the operation of the mechanism, the invention is implemented in such manner that at least one stopper actuator lever is pivoted on each end of the internal transporter body, the said levers being connected to the bridges and moving along with these. When pressing against the base of the stopper peg, the stopper actuator lever is turned from a horizontal position to a low position.

Abstract: A method and apparatus for controlling a direct current motor of an elevator during emergency braking by conducting a current generated by the motor through a braking resistor are disclosed, in which a semiconductor switch connects the braking resistor across the motor during the emergency braking and a mains voltage to the motor is simultaneously interrupted.

Abstract: A way of placing chokes with air core, such as thyristor commutating chokes, in a three-phase alternating current rectifier. With a view to eliminating the drawbacks of air-core chokes especially in three-phase rectifying applications, the three chokes of three phases, wound in the same winding direction, are placed on one and the same plane at the corner points of an imagined triangle which brings the chokes as close together as possible.

Abstract: The present invention concerns a speed limiter for lifts provided with catch device. The tension force acting on the lifting rope of an elevator is greatly variable. A detrimental feature herein is the jerky stopping of the rope sheave, resulting in looping of the rope and delay of the onset of braking effect. The invention serves the object to eliminate these drawbacks and to provide an improved speed limiter.

Abstract: This invention concerns dual rail transportation system (1) used with roller pallets on which the wheels (2) of at least one pair of wheels are swiveling. On the margins of the running surface (5) of one rail (4) have been provided relatively low steering flanges (6) with a spacing (a) nearly the same as the breath (b) of the wheel traveling thereon. The other rail has a flat running surface sufficiently wider than the surface (5) of the one rail (4) to permit swiveling of the wheel traveling thereon. The roller pallet will hereby be steered with high accuracy on the rails.

Abstract: A theatrical stage, comprising a plurality of side-by-side, screw-operated shearlegs tables, each such table having its own operating mechanism connected to the operating vertical screw. The screw is pivotally connected to the shearlegs members by dual transmission members, by which movement of the table platform is made almost linear in relation to the rotation of the screw. The vertical movement of the platform of the shearlegs tables is synchronized by employing as operating mechanism, electro-hydraulic step motors for each table, with a brake mounted on each screw for arresting rotary motion of the step motor.

Abstract: A pulse floor selector for a lift, with a floor and location determining system based on counting pulses indicating the lift's velocity, with the aid of electronics thereto appropriate. Dense pulse floor selection is used for determining the lift's location, in particular in modern high speed lifts. To serve as pulse former, generally a pulse transmitter (PA) mechanically coupled with the motor is required, which supplies a number of pulses (PT) proportional to the distance traversed. The present invention represents a different approach wherein the requisite pulses are formed without transmitter. In the means of the invention, there has been connected to the tachometer generator (TG) giving the velocity of the lift, an analog/digital converter (A/D) which delivers to the electronics taking care of floor and location determination, a pulse train (PT) of which the frequency is proportional to the lift's velocity, whereby the total number of pulses per time unit is thus proportional to the distance travelled.

Abstract: The present invention concerns a method for improving the dynamic converter drive for a direct current elevator motor, in which the said motor is controlled by adjusting the magnetization of the generator linked to the lifting motor, such adjustment being achieved by means of a power electronics stage controlled by the elevator speed control system, using at least elevator speed and motor current consumption (or other current information proportional thereto) as feedback parameters.

Abstract: Procedure and apparatus for conveying the input and output data of a process or of other computer-controlled apparatus or equipment to a processor system comprising one or several central units with memories. The input and output data (I/O) are separated from the central units by means of I/O memories and the data transfer between the input and output data matching unit or interface and the I/O memories is performed by an I/O copier.

Abstract: A pick-up means for roller pallets in such applications where the roller pallets (1) run on rails (2) on tracks (3). At the discharge end of the tracks there is a stop (4) preventing the discharge of roller pallets until a pick-up means (6) provided with a travelling surface (5) comes to get the roller pallets meant to be dispatched. The pick-up means of the invention is characterized in that it comprises a slide (8) movable in its longitudinal direction and provided with a transporter (7), said slide being at a pick-up operation movable in under the first roller pallet (1) on the rails (2), while at the same time it will disengage the stop (4) so that the roller pallet moves onto the travelling surface (5) of the pick-up means, being pulled by the slide (8). The pick-up operation is now accomplished with considerably greater safety and speed than with any apparatus of prior art.

Abstract: This procedure and apparatus is used for transferring data between central units or processors in a multi-processor system. The system includes one or several central units (3) with memories (4). The data to be transferred between central units (3) or processors are separated from their internal bus (6) by means of joint memories (2) and that the data transfer between the joint memories (2) is effected by a separate copying means (1).

Abstract: A procedure for adjusting the stopping of an elevator as accurately as possible on desired level with the aid of the deceleration instruction (DR). From the elevator's deceleration instruction (DR) a sample is taken at the beginning and at the end of deceleration, these are compared with each other and the linearity of deceleration is adjusted on the basis of the result obtained. The invention also concerns an elevator deceleration measuring circuit for carrying out the procedure. The measuring circuit, connected to the deceleration instruction (DR) of the elevator, comprises a display unit such as for instance two light-emitting diodes (D4,D5) by which the result can be ascertained if the deceleration instruction is increasing or decreasing.

Abstract: An elevator speed control system permitting rotation of the motor with short-circuited rotor at full speed, wherein the thyristors controlling said motor permit the motor to rotate at full speed and when the elevator is running in the lighter direction, operation of the motor as generator at an over-synchronous speed. The system comprises a control unit assembled of components known in themselves in the art by which the instruction value is increased considerably past the actual value, whereby the motor with short-circuited rotor is left to rotate at full speed, and that on commencing retardation the instruction value is dropped directly to be consistent with the actual value.

Abstract: Procedure for monitoring the phase sequence in a three-phase network, for instance in lift operation. Between the normal voltage vectors (R,S,T) indicating the phases are added extra vectors (R',S') which are mutually opposed and equal vectors, and that the extra vectors (R',S') and the voltage vectors (R,S,T) are added up and on the basis of the sum thus obtained, necessary steps are taken.

Abstract: An improvement of a thyristor converter drive wherein a thyristor converter drives a load, such as an electric machine, with which a series resonance circuit (1) has been connected in parallel. The components (2,3) of the series resonance circuit (1) are so selected that the charging phase and discharging phase of the circuit have equal length.

Abstract: A method and apparatus for switching thyristor bridges in converting alternating current statically to direct current by the aid of two thyristor bridges connected in parallel so that a direct current machine consuming direct current will receive both positive and negative current. One and the same analog voltage controls both thyristor bridges so that when the controlling analog voltage is positive the first bridge is open and when the controlling analog voltage is negative the second bridge is open, and that as the circuit approaches zero-current state the bridges shift to a reciprocally oscillating mode of operation.

Abstract: A method and apparatus for monitoring current data in a thyristor-controlled direct current drive, the drive system comprising two thyristor bridges converting alternating current into direct current for the drive motor and a current measuring unit. With the aid of a current controller the drive system is caused to operate in one of two different modes of operation, so that as the system approaches zero current condition, the normal mode of operation changes to an oscillating mode, the direct current circuit being monitored with the aid of a delayed current indicator datum in the zero current situation as well.

Abstract: Apparatus for interfacing weighing data with a lift control system that has been carried out with an operator amplifier circuit comprising a speed controller amplifier (NS) of which the plus terminal has been connected to ground and at the minus terminal enter the speed set-point value and the current speed value and further from the minus terminal has been connected to the output of the speed controller amplifier a stabilizing resistor (R1), and a stabilizing capacitor (C1). The apparatus comprises a start switch (K1) which short-circuits the stabilizing resistor (R1) and an auxiliary start switch (K1A) which connects the juncture of the stabilizing resistor (R1) and capacitor (C1) to the terminals of the weighing data resistors (R7) and (R8). The other end of the latter weighing datum resistor (R8) is connected to the output of the speed controller amplifier (NS) and to the other end of the foremost weighing datum resistor (R7) has been connected the external weighing datum.