Electrical control safety system comprising photocells or equivalent sensors

• US 20070018600A1
• Filed: 07/14/2006
• Published: 01/25/2007
• Est. Priority Date: 06/06/2002
• Status: Active Grant

• Current Assignee: Nice S.p.A. (Nice Group SpA)
• Original Assignee: Nice S.p.A. (Nice Group SpA)
• Inventors: Marchetto, Oscar, Cuzziol, Fulvio, Sandrin, Luigi, Tomasella, Sergio
• Granted Patent: US 7,291,998 B2
• Time in Patent Office: Days
• US Class Current: 318/466
• CPC Class Codes: E05F 15/00 Power-operated mechanisms for wings motor-operated accessories in locks for completing closing or initiating opening of a wing E05B17/00
• CPC Class Codes: E05F 15/70 with automatic actuation
• CPC Class Codes: E05Y 2400/822 Light emitters, e.g. light emitting diodes [LED]
• CPC Class Codes: E05Y 2400/83 Travel information display
• CPC Class Codes: G05B 19/042 using digital processors G05B19/05 takes precedence
• CPC Class Codes: G05B 2219/25132 Superposition data signals on power lines for actuators
• CPC Class Codes: G05B 2219/25163 Transmit twice, redundant, same data on different channels, check each channel
• CPC Class Codes: G05B 2219/2628 Door, window

Abstract

Electrical control safety system comprising two photocells or equivalent sensors applied on a sliding gate CA, the two photocell systems FC1, FC2 being composed respectively of at least two transmitters FC1-T,FC2-T and two receivers FC1-R,FC2-R, and the control safety system being cyclically able to make to operate during a first operating time interval the first photocell system FC1 while the second photocell system is disabled, and being cyclically able during a second operating time interval, subsequent to the first one, to make to operate the second photocell system FC1 while the first photocell system is disabled.

Claims

1. An electrical control safety system comprising two safety devices applied on a sliding gate, the control safety system being cyclically able to make to operate during a first operating time interval the first safety device while the second safety device is disabled, and being cyclically able during a second operating time interval, subsequent to the first one, to make to operate the second safety device while the first safety device is disabled.

2. The electrical control safety system according to claim 1, comprising as safety devices at least two photocell systems or equivalent sensors applied on the sliding gate, the two photocell systems being composed respectively of at least two transmitters and two receivers and the control safety system being cyclically able to make to operate during a first operating time interval the first photocell system while the second photocell system is disabled, and being cyclically able during a second operating time interval, subsequent to the first one, to make to operate the second photocell system while the first photocell system is disabled.

3. The electrical control safety system according to claim 2, comprising at least four peripheral units connected with a network and each connected to one of the transmitters or the receivers, and further comprising a central unit being prepared so that it transmits over said network digital information packets to the peripheral units.

4. The electrical control safety system according to claim 3, wherein the at least four peripheral units are arranged so that they detect the packets and extract from these a clock signal with a period which will be identical for all four units.

5. The electrical control safety system according to claim 4, wherein the period of the clock signal is divided into two equal parts:

during the first part only two of the at least four peripheral units are activated, and during the second part only the remaining units of the at least four peripheral units are activated.

6. The electrical control safety system according to claim 4, wherein unit identification codes are assigned to the at least four peripheral units, two odd codes and two even codes respectively, two units being able to activate respectively one transmitter and one receiver of the photocell system during an odd sub-period of each period of the extracted clock signal, while other two units are able to activate respectively the other transmitter and the other receiver of the photocell system during an even sub-period of each period of the extracted clock signal.

7. The electrical control safety system according to claim 3, wherein the central control unit is adapted to be electrically connected to an electric motor for controlling operation thereof.

8. The electrical control safety system according to claim 3, wherein the central unit is adapted to be electrically connected to a device for entering requests of movement of a gate or a door or similar element on which the at least two photocells or equivalent sensors are applied.

9. The electrical control safety system according to claim 3, wherein the central unit is adapted to establish communication with the at least four peripheral units through exchange of packets of digital information according to the “

master-slave”

technique wherein the central unit operates as “

master” and

the peripheral units operate as “

slaves”

.

10. The electrical control safety system according to claim 3, wherein the central unit is adapted to cyclically poll every peripheral unit with the transmission of one or more data packets to which the peripheral unit is adapted to respond by transmitting a response data packet.

11. The electrical control safety system according to claim 10, wherein each peripheral unit is adapted to send over the network a response data packet comprising the status of the peripheral unit itself.

12. The electrical control safety system according to claim 10, wherein the central unit, in the event a peripheral unit has not been responding, is adapted to wait for all the units to be polled, and then to perform a last check on the non-responding unit.

13. The electrical control safety system according to claim 10, wherein the data packet transmitted over the network comprises a data part and a check part.

14. The electrical control safety system according to claim 3, wherein the central unit is prepared so that it transmits over the network digital information packets at a fixed rate.

15. The electrical control safety system according to claim 3, wherein the data packet transmitted over the network comprises a data part and a check part.

16. The electrical control safety system according to claim 3, wherein the network comprises two wires.

17. The electrical control safety system according to claim 5, wherein unit identification codes are assigned to the at least four peripheral units, two odd codes and two even codes respectively, two units being able to activate respectively one transmitter and one receiver of the photocell system during an odd sub-period of each period of the extracted clock signal, while other two units are able to activate respectively the other transmitter and the other receiver of the photocell system during an even sub-period of each period of the extracted clock signal.

18. The electrical control safety system according to claim 11, wherein the central unit, in the event a peripheral unit has not been responding, is adapted to wait for all the units to be polled, and then to perform a last check on the non-responding unit.