EP0227617A2 - System for transmitting commands, particularly to motor-driven transport means - Google Patents
System for transmitting commands, particularly to motor-driven transport means Download PDFInfo
- Publication number
- EP0227617A2 EP0227617A2 EP86830380A EP86830380A EP0227617A2 EP 0227617 A2 EP0227617 A2 EP 0227617A2 EP 86830380 A EP86830380 A EP 86830380A EP 86830380 A EP86830380 A EP 86830380A EP 0227617 A2 EP0227617 A2 EP 0227617A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- commands
- transmission
- circuit
- command signals
- circuits
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000002093 peripheral effect Effects 0.000 claims abstract description 20
- 239000004020 conductor Substances 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 6
- 230000005540 biological transmission Effects 0.000 claims description 28
- 238000005070 sampling Methods 0.000 claims description 14
- 230000001788 irregular Effects 0.000 claims 1
- 238000004804 winding Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 3
- 230000002547 anomalous effect Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005007 materials handling Methods 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 238000010200 validation analysis Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/40—Applications of devices for transmitting control pulses; Applications of remote control devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/40—Applications of devices for transmitting control pulses; Applications of remote control devices
- B66C13/44—Electrical transmitters
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
- G08C19/12—Electric signal transmission systems in which the signal transmitted is frequency or phase of ac
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
- G08C19/30—Electric signal transmission systems in which transmission is by selection of one or more conductors or channels from a plurality of conductors or channels
Definitions
- the present invention relates to systems for the transmission of commands to peripheral means, particularly to motor-driven transport means and principally to automatic carriages on rails for the overhead conveyance of materials, wherein a main station is provided that generates and sends command signals to the peripheral means which house on-board receiving and handling circuits for the command signals.
- One is dealing, for example, with commands for starting, changing from one speed to another, slowing, stopping, reversing, the carrying out of various operative functions by tools mounted on the motor-driven transport means themselves.
- the bus-bars are generally fixed to the core of the rail carrying it or to a flat strip or other support located above or to the side of the rail, a common arrangement, for example, in cases in which the self-propelled vehicle is a bridge crane or other translatory machine.
- the present invention aims at overcoming the disadvantages of the prior art, particularly to enable the sending of a plurality of command signals without the need to use an individual bus-bar for each command.
- the object of the invention is to provide means for the transmission of commands to motor-driven transport means which is simple, efficient and easy to install.
- the present invention provides a system for the transmission of a plurality of commands to peripheral means, particularly motor-driven transport means and principally automatic carriages on rails for the overhead conveyance of materials, which provides a main station that generates and sends command signals to the peripheral means which house on-board circuits for receiving and handling the command signals, characterised in that the plurality of commands is obtained by a coded signal formed from a sine wave which is sent to the peripheral means through a single conductor.
- Two phases of the mains voltage are supplied, across the terminals R and S, to the primary winding 1 of a transformer 2 which has a secondary winding 3 and a central earth outlet.
- the two ends of the secondary winding 3 are connected respectively to a first rectifier circuit 4 and a second rectifier circuit 5.
- Each of the two rectifier circuits 4 and 5 has two output terminals and contains two diodes arranged with inverse polarities so that the two outputs of each rectifier circuit comprise half-waves of the mains voltage with opposite polarities.
- the four outputs of the two rectifier circuits are fed respectively to the inputs of four switch circuits 6, 7, 8 and 9 which are controlled by four respective control signals from a matrix coding circuit 10 controlled by a command selection circuit 11 through an opto-insulated interface circuit 12.
- the four outputs of the switches 6, 7, 8 and 9 are fed to an adding circuit 13 of the "OR" type, the output of which is fed to a command bus-bar B7.
- Figure 2 shows the waveforms of command signals; those indicated A to F may occur at points of the circuit of Figure 1 indicated by corresponding letters.
- the waveforms indicated G and H are also command signals which can be created by the apparatus shown in Figure 1.
- a bus-bar B6 carries control signals and signals of anomalous operation from the transport means to the ground station by the same method as that described for the transmission of the command signals from the ground station to the transport means.
- the voltages present on the bus-bars B1 and B2 are used to create in the block 14 the various supply voltages for the electronic circuits present in the apparatus on the transport means.
- the voltages present on the bus-bars B1 and B2 are also fed to the input of a mains synchronism generator circuit 15 which has two outputs supplying the control inputs of a sampling circuit 16.
- the sampling circuit 16 has an input connected to an opto-insulated interface 17 which receives the command signals from the bus-bar B7.
- the output of the sampling circuit 16 is fed to a digital integrator 18 which enables the validation of a command signal only after it has received a predetermined number of half-waves and its cancellation only after it has received the same number with a different composition.
- the signal output by the integrator 18 is supplied to an automatic operating control circuit 19 for the transport means.
- This circuit 19 oversees all the translation, actuation and working operations of the motor-driven transport means and typically may comprise a microprocessor.
- the automatic operating control circuit 19 also receives input signals through an opto-insulated interface 20 from a unit 21 which controls external control devices: these devices carry out, for example, the function of preventing collisions of the transport means, signalling states of emergency, an alarm for the opening of heat safety devices, etc..
- the control circuit 19 therefore also has an output connected to a coded signal generator 22 for generating signals relative to the operating conditions of the apparatus, which is similar to that located at the ground station and shown in Figure 1.
- Another output of the control circuit 19 leads to a visual display device 23 for displaying the state of the apparatus.
- a final output of the circuit 19 is fed to a multiplexer circuit 24 which converts the command signals into operating signals for a control module 25 of the motor 26.
- the module 25 also received the three three-phase voltages R, S and T necessary for supplying power to the transport means and for the operations it has to carry out.
- control panel 27 which outputs command signals to the circuit 24 through an opto-insulated interface 28.
- An OUT output is also available for supplying command signals to other peripheral units.
- a primary winding of a trasnformer 30 which has a secondary winding 31 with a central earth outlet is indicated 29.
- the two terminals of the secondary winding 31 are connected respectively to a first rectifier circuit 32 and a second rectifier circuit 33.
- the two rectifier circuits are identical whereby the two outputs of the rectifier circuits comprise positive half-waves which are 180° out of phase with each other in that the rectifier circuits receive the balanced signals from the secondary winding 31 with the central earth outlet.
- the signals output by the two rectifier circuits 32 and 33 constitute synchronism signals derived from the voltage present on the bus-bars B1 and B2 and serve to define time periods associated with "positive phases” or "negative phases".
- the signals U and V are then supplied to timing inputs of a first sampling circuit 34 and a second sampling circuit 35.
- the two sampling circuits 34 and 35 also receive the command signals to be decoded from the bus-bar B7, each through a respective rectifier circuit 36 and 37 and a squaring circuit 38 and 39.
- the two rectifier circuits 36 and 37 rectify respectively the positive half-waves and the negative half-waves contained in the command signals.
- sampling circuits 34 and 35 are two "AND" gates whose inputs receive both the synchronism signal from the synchronism generator circuit (15; 30, 32, 33) and the command signals to be decoded from the squaring circuits 38 and 39.
- the outputs of the four AND gates constitute the outputs L, M, N, O of the sampling circuit and, according to the signal present at their terminals, may have the various command signals to be passed to the control circuit 19 of the transport means.
- the code is generated at the ground station essentially through the rectifier circuits 4 and 5, the coding matrix (6, 7, 8, 9 and 10), and the adding circuit 13 (see Figure 1).
- the outputs from the secondary winding 3 have the waveforms A and B which represent the mains voltage with opposite phases.
- the waveform A which can be considered as having a "positive" phase, gives rise to two waveforms C and D at the output of the rectifier circuit 4 which represent respectively the positive and negative positive-phase waveforms of the coded command signals.
- the waveform B represents the "negative" phase and the signals which this produces at the output of the rectifier circuit 5 are the positive and negative half-waves (E and F) - with a negative phase - of the coded command signal.
- the bus-bar B7 carries the coded command signals sent to the ground station. These may be in the form of one of the eight waveforms shown in Figure 2.
- the sampling circuit 16 decodes them and, after the digital integrator 18 has confirmed their validity, feeds them to the control circuit 19 which in turn feeds them through the multiplexer 24 to the circuits which directly control the motor 26 of the transport means.
- the decoding of the command signals occurs as follows.
- the main voltage present at the terminals R and S generates, through the balanced transformer 30 and the rectifier circuits 32 and 33, a series of positive half-waves which exist only at the respective instants corresponding respectively to the positive phases and to the negative phases, and thus act as period synchronism signals for the AND gates.
- the signals output by the squaring circuit 38 are constituted solely by positive half-waves, whatever their time phase, while the signals output by the squaring circuit 39 are constituted solely by negative half-waves, whatever their time phase.
- the AND gates can repeat at their outputs L, M, N, O the eight combinations of command signals which are present on the bus-bar B7 from the ground station.
- the signals output at the terminals L, M, N and O correspond to the eight waveforms shown in Figure 2 in accordance with the following table.
- the eight states of the outputs L, M, N and O constitute the decoded command signals which serve to control the transport means.
- These means may also have an on-board generator 20, 21, 22 for signals of the operating conditions, which may be complete, like that which generates the eight ground command signals, but which may also be formed more economically with only two of the four switches 6, 7, 8 and 9 provided in the ground station.
- the reduced circuit could generate three of the eight waveforms shown in Figure 2 which will still be sufficient for diagnosis, that is, for indicating the presence, absence or anomalies or various signals, and transmitting this data to the ground station.
- An anomaly may be any one of the following conditions occurring on the carriage: operation of emergency push-button, thermal switch open, actuation of anti-collision device.
- an important advantage of the present invention lies in the fact that the command signals used are a function of the phase of the command voltage relative to the line voltage and not of its amplitude: this makes the system less sensitive to disturbance.
- the signal coding processor of the present invention for commanding different operations, not only those relating to overhead self-propelled carriages or automatically guided vehicles on the ground, but generally for the sending of a plurality of signals on a single conductor.
Abstract
Description
- The present invention relates to systems for the transmission of commands to peripheral means, particularly to motor-driven transport means and principally to automatic carriages on rails for the overhead conveyance of materials, wherein a main station is provided that generates and sends command signals to the peripheral means which house on-board receiving and handling circuits for the command signals.
- Many methods and devices are known for the remote control of apparatus or machines driven by electric motors.
- For example, in the field of materials handling in manufacturing industries, it is necessary to use methods and devices for the remote control of the functions inherent to the operations carried out by vehicles moved by electric motors, particularly those running on rails.
- In these cases, several transmission lines (cables, rails, bus-bars) are often used which transmit the command signals generated by control apparatus located at a ground station to the self-propelled vehicle through sliding contact brushes.
- One is dealing, for example, with commands for starting, changing from one speed to another, slowing, stopping, reversing, the carrying out of various operative functions by tools mounted on the motor-driven transport means themselves.
- In the example of an application to self-propelled carriages on rails, the bus-bars are generally fixed to the core of the rail carrying it or to a flat strip or other support located above or to the side of the rail, a common arrangement, for example, in cases in which the self-propelled vehicle is a bridge crane or other translatory machine.
- When the number of commands to be transmitted is considerable, the number of conductors or bus-bars also increases. Difficulties are thus generated in the arrangement of the bus-bars, particularly in the case of the arrangement of the conductors on the core of the slide rail for an overhead self-propelled system where the conductors for supplying the drive motors of the individual carriages must also be housed.
- In the case of self-propelled carriages on rails, the need has now been reached to arrange 7, 8, 9 and up to 10 bus-bars or the like, with the disadvantage that, because of the limited dimensions of the rail profile, it is necessary to limit the maximum number of bus-bars which can be housed and hence the number of commands which can be given.
- Sometimes recourse is made to external auxiliary command lines if the functions to be controlled exceed those that can be controlled by the number of bus-bars which can be housed along the core of the rail and, moreover, attempts are made to produce extremely compact assemblies to the detriment of the ease of installation and maintenance.
- If it were wished to use remote control systems with electromagnetic signals instead of bus-bars, however, it would be necessary to mount complex receiving circuits on the self-propelled carriages, while the system itself would also be exposed to the industrial environment where it would be prone to serious malfunctions because of the noise and electromagnetic interference created by the other equipment in operation.
- The present invention aims at overcoming the disadvantages of the prior art, particularly to enable the sending of a plurality of command signals without the need to use an individual bus-bar for each command.
- Therefore, the object of the invention is to provide means for the transmission of commands to motor-driven transport means which is simple, efficient and easy to install.
- Hence, in order to achieve these objects, the present invention provides a system for the transmission of a plurality of commands to peripheral means, particularly motor-driven transport means and principally automatic carriages on rails for the overhead conveyance of materials, which provides a main station that generates and sends command signals to the peripheral means which house on-board circuits for receiving and handling the command signals, characterised in that the plurality of commands is obtained by a coded signal formed from a sine wave which is sent to the peripheral means through a single conductor.
- Further objects and advantages of the present invention will become clear from the detailed description which follows and from the appended drawings provided purely by way of non-limiting example, in which:
- Figure 1 shows part of the circuit which generates the command signals and is located in the ground station forming part of the system of the present invention;
- Figure 2 shows the waveform of command signals which are used to control the functions of the transport means, in accordance with the present invention;
- Figure 3 is a block-schematic diagram of the circuit mounted on the transport means, in accordance with the present invention;
- Figure 4 shows part of the decoding circuit for the command signals mounted on the transport means, in accordance with the present invention.
- In Figure 1, which shows the application of the invention to the case of the trasmission of commands used to control self-propelled vehicles which move on a rail, three input terminals for a three-phase supply voltage taken from the mains are indicated R, S and T.
- Two phases of the mains voltage are supplied, across the terminals R and S, to the
primary winding 1 of a transformer 2 which has a secondary winding 3 and a central earth outlet. The two ends of the secondary winding 3 are connected respectively to a first rectifier circuit 4 and asecond rectifier circuit 5. Each of the tworectifier circuits 4 and 5 has two output terminals and contains two diodes arranged with inverse polarities so that the two outputs of each rectifier circuit comprise half-waves of the mains voltage with opposite polarities. - The four outputs of the two rectifier circuits are fed respectively to the inputs of four
switch circuits - The four outputs of the
switches circuit 13 of the "OR" type, the output of which is fed to a command bus-bar B7. - Figure 2 shows the waveforms of command signals; those indicated A to F may occur at points of the circuit of Figure 1 indicated by corresponding letters.
- The waveforms indicated G and H are also command signals which can be created by the apparatus shown in Figure 1.
- In Figure 3, the power bus-bars which carry the power supplies to the transport means are indicated B1, B2, B3 and B4, while the bus-bar which carries the command signals generated by the ground station by means of the apparatus shown in Figure 1 is indicated B7.
- In the preferred embodiment, however, a bus-bar B6 carries control signals and signals of anomalous operation from the transport means to the ground station by the same method as that described for the transmission of the command signals from the ground station to the transport means.
- The voltages present on the bus-bars B1 and B2 are used to create in the
block 14 the various supply voltages for the electronic circuits present in the apparatus on the transport means. - The voltages present on the bus-bars B1 and B2 are also fed to the input of a mains
synchronism generator circuit 15 which has two outputs supplying the control inputs of asampling circuit 16. - The circuit details for the realisation of the
mains synchronism generator 15 and thesampling circuit 16 will be shown in Figure 4. - The
sampling circuit 16 has an input connected to an opto-insulatedinterface 17 which receives the command signals from the bus-bar B7. The output of thesampling circuit 16 is fed to adigital integrator 18 which enables the validation of a command signal only after it has received a predetermined number of half-waves and its cancellation only after it has received the same number with a different composition. - The signal output by the
integrator 18 is supplied to an automaticoperating control circuit 19 for the transport means. Thiscircuit 19 oversees all the translation, actuation and working operations of the motor-driven transport means and typically may comprise a microprocessor. - The automatic
operating control circuit 19 also receives input signals through an opto-insulatedinterface 20 from a unit 21 which controls external control devices: these devices carry out, for example, the function of preventing collisions of the transport means, signalling states of emergency, an alarm for the opening of heat safety devices, etc.. - The
control circuit 19 therefore also has an output connected to a codedsignal generator 22 for generating signals relative to the operating conditions of the apparatus, which is similar to that located at the ground station and shown in Figure 1. - Another output of the
control circuit 19 leads to avisual display device 23 for displaying the state of the apparatus. - A final output of the
circuit 19 is fed to amultiplexer circuit 24 which converts the command signals into operating signals for acontrol module 25 of themotor 26. Themodule 25 also received the three three-phase voltages R, S and T necessary for supplying power to the transport means and for the operations it has to carry out. - In order to enable additional manual control of the transport means, a
control panel 27 is also provided which outputs command signals to thecircuit 24 through an opto-insulatedinterface 28. - The selection of the manual or automatic operation is effected by means of a signal indicated M/A in the drawings.
- An OUT output is also available for supplying command signals to other peripheral units.
- In Figure 4, a primary winding of a
trasnformer 30 which has asecondary winding 31 with a central earth outlet is indicated 29. The two terminals of thesecondary winding 31 are connected respectively to afirst rectifier circuit 32 and asecond rectifier circuit 33. The two rectifier circuits are identical whereby the two outputs of the rectifier circuits comprise positive half-waves which are 180° out of phase with each other in that the rectifier circuits receive the balanced signals from thesecondary winding 31 with the central earth outlet. - Hence, the signals output by the two
rectifier circuits - The signals U and V are then supplied to timing inputs of a
first sampling circuit 34 and asecond sampling circuit 35. The twosampling circuits respective rectifier circuit squaring circuit rectifier circuits - Within the
sampling circuits squaring circuits - The outputs of the four AND gates constitute the outputs L, M, N, O of the sampling circuit and, according to the signal present at their terminals, may have the various command signals to be passed to the
control circuit 19 of the transport means. - The operation of the system described is as follows.
- With the use of the means described above, the transmission of a plurality of commands to the transport means through a single conductor is made possible with the use of a suitably coded signal.
- The code is generated at the ground station essentially through the
rectifier circuits 4 and 5, the coding matrix (6, 7, 8, 9 and 10), and the adding circuit 13 (see Figure 1). - More particularly, again with reference to the waveforms shown in Figure 2, it is known that the outputs from the secondary winding 3 have the waveforms A and B which represent the mains voltage with opposite phases. The waveform A, which can be considered as having a "positive" phase, gives rise to two waveforms C and D at the output of the rectifier circuit 4 which represent respectively the positive and negative positive-phase waveforms of the coded command signals.
- Similarly, the waveform B represents the "negative" phase and the signals which this produces at the output of the
rectifier circuit 5 are the positive and negative half-waves (E and F) - with a negative phase - of the coded command signal. - With these signals (C, D, E and F) present at the four inputs of the
switches circuit 13 by the appropriate closure of the switches controlled by the matrix circuit 10. - It is thus possible to send eight different coded command signals on the bus-bar B7, corresponding to an equal number of functions which have to be carried out by the motor-driven transport means.
- The operation of the control system on the transport means is explained in Figures 3 and 4.
- The bus-bar B7 carries the coded command signals sent to the ground station. These may be in the form of one of the eight waveforms shown in Figure 2. The
sampling circuit 16 decodes them and, after thedigital integrator 18 has confirmed their validity, feeds them to thecontrol circuit 19 which in turn feeds them through themultiplexer 24 to the circuits which directly control themotor 26 of the transport means. - More particularly, the decoding of the command signals occurs as follows.
- The main voltage present at the terminals R and S generates, through the
balanced transformer 30 and therectifier circuits - The signals output by the squaring
circuit 38 are constituted solely by positive half-waves, whatever their time phase, while the signals output by the squaringcircuit 39 are constituted solely by negative half-waves, whatever their time phase. - By combining the signals output by the squaring
circuits -
- Hence, the eight states of the outputs L, M, N and O constitute the decoded command signals which serve to control the transport means.
- These means may also have an on-
board generator switches - In this case, the reduced circuit could generate three of the eight waveforms shown in Figure 2 which will still be sufficient for diagnosis, that is, for indicating the presence, absence or anomalies or various signals, and transmitting this data to the ground station.
- In this instance, it is necessary to add the bus-bar B6.
- An anomaly may be any one of the following conditions occurring on the carriage: operation of emergency push-button, thermal switch open, actuation of anti-collision device.
- It is also important that the entire system be manually controllable and hence the
circuits - From the description given the advantages of the method and apparatus for the transmission of commands, particularly to motor-driven transport means and principally to automatic carriages on rails for the overhead transport of material, which is the subject of the present invention are clear.
- In particular, these are represented by the fact that it is possible to send a plurality of command signals without the need to use a single bus-bar for each command. Moreover, the means for the transmission of commands is simple and easy to install because of an appreciable reduction in bulk due to the elimination of supplementary external cables and a smaller number of parts, and consequently has greater reliability and lower plant costs.
- Finally, it should be noted that an important advantage of the present invention lies in the fact that the command signals used are a function of the phase of the command voltage relative to the line voltage and not of its amplitude: this makes the system less sensitive to disturbance.
- This detail is very important for applications in industry. In order further to improve this characteristic, digital integrators are also provided. Clearly, an expert in the art may make numerous variations to the method and apparatus for the transmission of commands, particularly to motor-driven transport means and principally to automatic carriages on rails for the overhead transport of materials, which is the subject of the present invention, without thereby departing from the scope of the novel principles of the inventive idea.
- Among these possible variations may be mentioned the possibility of using the power bus-bars themselves for sending the coded command signals.
- Alternatively, mention may be made of the use of the signal coding processor of the present invention for commanding different operations, not only those relating to overhead self-propelled carriages or automatically guided vehicles on the ground, but generally for the sending of a plurality of signals on a single conductor.
Claims (19)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT6808885 | 1985-12-20 | ||
IT68088/85A IT1184036B (en) | 1985-12-20 | 1985-12-20 | PROCEDURE AND DEVICE FOR THE TRANSMISSION OF COMMANDS ESPECIALLY TO MOTORIZED TRANSPORT VEHICLES |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0227617A2 true EP0227617A2 (en) | 1987-07-01 |
EP0227617A3 EP0227617A3 (en) | 1988-01-07 |
Family
ID=11307755
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86830380A Withdrawn EP0227617A3 (en) | 1985-12-20 | 1986-12-18 | System for transmitting commands, particularly to motor-driven transport means |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0227617A3 (en) |
IT (1) | IT1184036B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0336051A2 (en) * | 1988-04-02 | 1989-10-11 | AKO-Werke GmbH & Co | Circuit arrangement with an electro-mechanic programmed switching device and electronic evaluation circuit for apparatus |
DE4108347A1 (en) * | 1991-03-12 | 1992-09-17 | Mannesmann Ag | Hoist drive control system with encoder and decoder - galvanically sepd. by opto-isolator in data lines powered by 40 V line driver for interference suppression |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH203276A (en) * | 1938-08-18 | 1939-02-28 | Touristique Pour Le Numerotage | Device for the electrical transmission of various messages respectively. Commands. |
US3488517A (en) * | 1966-06-29 | 1970-01-06 | Merseyside & North Wales Elect | Control systems |
JPS53112016A (en) * | 1977-03-11 | 1978-09-30 | Mitsubishi Electric Corp | Signal transmitter |
-
1985
- 1985-12-20 IT IT68088/85A patent/IT1184036B/en active
-
1986
- 1986-12-18 EP EP86830380A patent/EP0227617A3/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH203276A (en) * | 1938-08-18 | 1939-02-28 | Touristique Pour Le Numerotage | Device for the electrical transmission of various messages respectively. Commands. |
US3488517A (en) * | 1966-06-29 | 1970-01-06 | Merseyside & North Wales Elect | Control systems |
JPS53112016A (en) * | 1977-03-11 | 1978-09-30 | Mitsubishi Electric Corp | Signal transmitter |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN, vol. 2, no. 145, 4th December 1978, page 9092 E 78; & JP-A-53 112 016 (MITSUBISHI DENKI K.K.) 30-09-1978 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0336051A2 (en) * | 1988-04-02 | 1989-10-11 | AKO-Werke GmbH & Co | Circuit arrangement with an electro-mechanic programmed switching device and electronic evaluation circuit for apparatus |
EP0336051A3 (en) * | 1988-04-02 | 1990-05-09 | Ako-Werke Gmbh & Co Kg | Circuit arrangement with an electro-mechanic programmed switching device and electronic evaluation circuit for apparatus |
DE4108347A1 (en) * | 1991-03-12 | 1992-09-17 | Mannesmann Ag | Hoist drive control system with encoder and decoder - galvanically sepd. by opto-isolator in data lines powered by 40 V line driver for interference suppression |
Also Published As
Publication number | Publication date |
---|---|
IT8568088A0 (en) | 1985-12-20 |
IT1184036B (en) | 1987-10-22 |
EP0227617A3 (en) | 1988-01-07 |
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