Communications: electrical – Continuously variable indicating – With particular transmitter
Patent
1985-09-19
1987-05-12
Myracle, Jerry M.
Communications: electrical
Continuously variable indicating
With particular transmitter
34082571, G08C 1908
Patent
active
046653996
DESCRIPTION:
BRIEF SUMMARY
STATE OF THE ART
The invention relates to a device for transmitting of binary data between a mobile data carrier an a stationary station, in particular between a workpiece support and a finishing or control station on transfer conveyors or assembly conveyors of the type stated in claim 1.
In an already suggested device of this type (DE-OS 33 31 694) the two resonant circuits which are mounted on ferrite cores are guided along very tightly with respect to each other when passing each other for safeguarding the data transmission during a data transmission between the data carrier formed by a workpiece support and a stationary station formed by a finishing or control station. This requires a very accurate positioning of the workpiece support on the assembly conveyors. The operating safety of the data transmission suffers if the workpiece support is not accurately aligned. The fading out process in the inductively coupled coils is time delayed or time accelerated depending on the binary values of the data at the side of the data carrier for a data transmission from the data carrier to the stationary station. The voltage value is scanned during a fading out process at a certain point in time on the stationary station for demodulating the transmitted data and the binary value is determined therefrom.
For the data transmission from the stationary station to the mobile data carrier the frequency of the switch pulse sequence for transmitting the binary value is fixed logically 1 to f and for transmitting the binary value logically 0 to 4/5f. BY a frequency modulation on the data carrier side, the transmitted binary value is recovered.
ADVANTAGES OF THE INVENTION
The device in accordance with the invention with the features of claim 1 has the advantage that the distances which have to be inductively bridged between the data carrier and the stationary station can be enlarged without impairing the operating safety. The maximum permissible distance between the coils is at least doubled with respect to the known unit by means of the resonance transmission. This means a larger permisssible tolerance range when aligning the tool support in the transfer conveyor or on the assembly conveyor. By means of the amplitude modulation during the data transmission from the data carrier to the stationary station the device also becomes less critical against a change in the stray inductance and against structural element tolerances.
Advantageous embodiments of the invention are obvious from the further claims 2-13.
An advantageous embodiment of the invention results from claim 5. A sufficient restoration of the binary signal from the data carrier to the stationary station is assured by this structure of the demodulation circuit to the stationary station side of the amplitude demodulation, without being influenced by slow fluctuations of the pulses of the transmitter being formed by the coils, for example, by changing the distance of the ferrite cores of the two resonance circuits. In particular, it is assured that the pulse width of the binary signals is not unduly changed which is particularly important for a sufficient data transmission.
An advantageous embodiment of the invention results from claim 7. In view of the frequency jump 2:1 during the data transmission from the stationary station to the data carrier it is assured that the device remains securely in resonance.
An advantageous embodiment of the invention also results from claim 4 and 11. In view of the given synchronisation latch it is assured that a change of the data signals to be transmitted becomes only effective at the beginning of the next cycle period.
DRAWING
The invention is explained by means of an exemplified embodiment illustrated in the drawing and is explained in more detail in the following. The drawing shows:
FIG. 1 is a circuit diagram of a device for data transmission from a mobile data carrier to a stationary station and vice versa,
FIG. 2 (including parts a-e) is a diagram of the signal path at selected locations in the circuit diagram of the de
REFERENCES:
patent: 3026504 (1962-03-01), Aurand et al.
Fauser Edwin
List Hans
Schirmer Gunter
Myracle Jerry M.
Robert & Bosch GmbH
Striker Michael J.
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