Fujitsu Fanuc Limited

Fanuc Corporation

Ryoji Imazeki

Etsuo Yamazaki

Takao Sasaki

Masayuki Hattori

Michiya Inoue

Katsuaki Kusumi

Yoshihiro Nakajima

Shigeo Nakamura

Mitsuo Kurakake

Hitoshi Matsuura

Hidetsugu Komiya

Etuo Yamazaki

Hiroomi Fukuyama

Yutaka Mizuno

Seiichi Hattori

Yoshimasa Kagawa

Kengo Kobayashi

Masashi Yamaguchi

Serial interchange machine interface circuit

Numerical control device

A method and system for rewriting data in a non-volatile memory in which the rewriting of one access unit of stored data is executed by erase and write cycles, the stored data being protected in the event of an interruption in electric power. In rewriting into second data the first data which is stored in a data storage area of the non-volatile memory, either the first or the second data is stored in a save area of the non-volatile memory, after which the first data in the data storage area is erased, followed by the writing of the second data in the data storage region to complete the rewrite operation.

Method of rewriting data in non-volatile memory, and system therefor

Control device for indexing a stepping rotatable member

Tracer control system

A clamping tracer control system which performs a tracing feed and a pick feed alternately and effects a clamping feed at a preset clamp level and in which, between the pick feed position where the clamping feed is carried out first and the pick feed position where the clamping feed has been completed, tracer control is repeated while changing the clamp level sequentially, and when the clamping feed has been completed in the repeated tracer control, the clamp level is restored to its area of initial value to resume tracer control of the tracing feed and the pick feed alternately in the next area.

Clamping tracer control system

In a system which performs tracer control by calculating the direction and velocity of tracing using signals from a tracer head tracing the model surface, there are provided an input unit for entering data defining the tracing operation, a memory for storing the data and a processor for reading out the data from the memory to control respective parts of a control device. Of the data defining the tracing operation, stored in the memory, data concerning the reference displacement of the tracer head is read out by the processor to change the reference displacement for each profile modeling operation, thereby automatically performing repetitive tracing.

In a power source device for a bubble memory unit consisting of a bubble memory part and a control part, a controlling supply voltage to be applied to both the bubble memory part and the control part is produced by a power source circuit based on a pulse width modulation system. The power source circuit is provided with a circuit which can expand the signal pulse width in excess of its upper-limit value during the ordinary voltage control. When the controlling supply voltage has become lower than a predetermined value, the pulse width is expanded so that the refresh operation may be perfectly executed when the power source device for the bubble memory unit is turned off.

Power source device for bubble memory unit

A portable bubble memory apparatus having a bubble memory cassette for accommodating a bubble memory element, and a portable cassette adapter provided with a cassette holder for loading and unloading the bubble memory cassette, the portable cassette adapter housing a control circuit and peripheral circuitry for the bubble memory element. A signal generator generates a signal to indicate whether the bubble memory cassette has been loaded at the correct position within the cassette holder. If the bubble memory cassette is displaced from the correct position, the generated signal causes the exchange of information between the bubble memory cassette and an external unit to cease. Additionally, if the bubble memory cassette is displaced from its correctly loaded position the electrical connection between the bubble memory cassette and the portable cassette adapter is maintained at least for a period of time, measured from the generation of the signal, required for the bubbles in the bubble memory to shift to a predetermined position, thereby preventing the loss of information stored in the bubble memory element.

Portable bubble memory apparatus

A three-dimensional tracer control system which is provided with an integration circuit for integrating the difference between a Z-axis direction displacement signal and a reference displacement signal and an adder for adding together the above-mentioned difference and the output from the integration circuit. The trace velocity in the Z-axis direction is controlled by the output from the adder, by which it is possible to perform tracing, with the Z-axis direction displacement signal and the reference displacement signal held nearly equal to each other; consequently, machining accuracy is increased.

Three-dimensional tracer control system

A tracer control system which performs tracer control based on a displacement signal from a tracer head tracing the surface of a model and is equipped with the function of freely setting the infeed of a cutter for machining a workpiece. The tracer control system is provided with a first drive system for feeding the tracer head in the Z-axis direction, a second drive system for feeding the cutter head in the Z-axis direction, first and second position detectors for detecting the positions of the tracer head and the cutter head in the Z-axis direction, and a superimposing circuit for superimposing on each other a position detection signal from the first position detector and an infeed command signal for setting the infeed of the cutter head. The cutter head is fed by the second drive system in the Z-axis direction so that the difference between output signals from the superimposing circuit and the second position detector may be reduced to zero.

A method and apparatus for numerically controlling a machine tool having at least two tools which are arranged to move in unison with a constant position relationship with respect to one another, the tools being moved relative to a workpiece in accordance with absolute commands to machine a workpiece in a prescribed manner. A single current position register, comprising a section for storing X coordinates and a section for storing Z coordinates, is provided to store the current position of a first tool. Further provided are arithmetic means, responsive to a command for setting coordinates, for computing the current position of a second tool, as well as pulse distribution means. The method includes the steps of storing the position of the first tool in the current position register prior to machining the workpiece with the first tool, moving the first tool to machine the workpiece in accordance with the current position and an absolute command, computing the current position of the second tool via the arithmetic means in response to the command for setting coordinates to change control from the first tool to the second tool, storing the computed current position in the current position register, and moving the second tool to machine the workpiece in accordance with the content of the current position register and an absolute command.

Method and apparatus for a numerical control device for controlling a

In a tracer control system which controls tracing based on displacement signals from a tracer head tracing the surface of a model, there are provided position detectors for detecting the positions of a tracing machine along the X, Y and Z axes and angle correcting means. The difference between a set trace direction and the actual trace direction detected by the position detectors is obtained for every other fixed distance of movement along the X-axis or Y-axis direction and a trace velocity along the X-axis or Y-axis direction is corrected by the angle correcting means so that the above difference may be reduced to zero, thereby controlling tracing to be performed in the set trace direction.

A programmable sequence controller which enables display of the contents of a storage means for storing input and output data to and from a machine, and which permits numerical values to be set in the storage device from an external unit. The programmable sequence controller utilizes a sending and receiving unit for an exchange of commands and other data with a numerical control device in order to transfer display content and numerical values which have been set. This allows the contents to be displayed on display means provided in the numerical control device, and permits the setting of numerical values which are entered from a data setting means provided in the numerical control device.

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Hachioji, Japan

Ryoji Imazeki