SU440554A1 - Registering device - Google Patents

Description

one

The invention relates to general purpose measuring instruments.

A recording device is known comprising a clock pulse driver, a switch associated with a power source, a time and control unit, and diodes. Such a device provides the printing of symbols and numbers characterizing the output time, for printing the control signals and the control signals themselves. However, a significant level of interference from the synchronizing pulse shapers leads to the printing of false characters and numbers when using the known recording device.

The purpose of the invention is to improve noise immunity.

For this, the recording device is equipped with serially connected low-pass filters connected to the clock pulse shaper, minimum limiters connected via diodes to the switch, and OR circuits connected to the print node of the time and control signals.

The drawing shows one of the possible variants of the proposed recording device.

The proposed recording device contains shapers 1 and 2 of synchronizing pulses, which are respectively included in the printing mechanisms 3 and 4. The printing mechanisms 3 and 4 contain only two shapers 1 and 2 of synchronizing pulses, although their number can be much larger, which is determined by number of printed characters and numbers. Each of the formers 1 and 2 of the clock pulses is connected to the input of one of the low-pass filters consisting of capacitors 5 and resistors 6 and 7. The outputs of the lower filters are connected to the inputs of minimum limiters made on transistors 8 and series-connected resistors 9 and 10. Each of the minimum limiters associated with the synchronization pulse generator 1 is connected to one of the inputs of the OR circuit, the output of which is connected to the signal printing unit 11

time and control. The other input of each OR circuit is connected to one of the minimum limiters associated with the driver 2 clock pulses. Each OR circuit consists of two diodes

12 and resistor 13.

The proposed recording device also contains a switch 14, the fixed contacts 15 and 16 of which are connected via resistors 17 to the power source 18. Fixed contact 15 is connected via diodes

19 with the inputs of all the minimum limiters associated with the driver 1 clock pulses. A fixed contact 16 is connected via diodes 19 to the inputs of all minimum limiters associated with the driver 2 clock pulses. Each diode 19, together with one of the low-pass filters and one of the minimum limiters, is part of the selector 20 of clock pulses.

The printing mechanisms 3 and 4 receive synchronized pulses distributed in time, each of which determines the imprinting of the corresponding character or number. However, through the selectors 20 to the node of the printing of time sipnals and controlled synchronization pulses from only one printing mechanism 3 or 4, the choice of which is determined by the state of the switch 14. The selectors 20 also provide suppression of interference

with shapers 1 and 2 clock pulses.

The proposed device can be used to document time signals and control signals of communications equipment.

Subject invention

A recording device containing clock drivers, a switch connected to a power source, a time signal printing and control unit, and diodes characterized in that, in order to improve noise immunity, it is provided with serially connected low-pass filters connected to the clock drivers, limiters on the minimum, connected via diodes to the switch, and OR circuits connected to the print node of the time and control signals.