SU1170505A1 - Device for indicating amount of magnetic tape in magnetic tape recorder - Google Patents

Abstract

DEVICE FOR INDICATING THE NUMBER MAGNETIC TAPE MACHINE In magnetic recording, comprising associated with the tape transport mechanism zhnym sensor tape footage coupled through a pulse shaper to an input matching schetchika-, a control unit connected with the outputs zhnym tape transport mechanism and relay winding, keys connected control input inputs with an output of the delay unit, the first, second, and counting and storing blocks j are connected to the setup bus, whose display outputs are connected to the display unit, and control of the modes of summation and subtraction: neither with two switching switches of the relay connected via a carnival divider with a potential supply voltage bus, and the common contact of the relay is connected to a zero voltage supply pin, which is designed to improve noise immunity, The first, second and third pulse shapers are entered into it in terms of duration, the outputs connected, respectively, to the counting inputs of the first, second and third counting and storing blocks, the control inputs p In summation and subtraction cycles which are connected via keys to a common relay contact, the input of the first forkshrevatel pulses is connected by the output of the matching counter, the inputs of the second and third pulse formers are connected respectively to the outputs of the transfer signal formers of the first and second counting and storing blocks, and In each counting and storing unit, ten indication inputs from the decoder are connected via an encoder and a delay circuit with a ten control to the inputs of the matching circuits Whose outputs are connected with ten windings poled five GOVERNMENTAL relay contacts through which the two logic O Output shaper signael fishing associated with ten inputs deshio fratora, the first and second inputs formng. The transmitters of the transfer signal of the first and second blocks of counting and storing are connected to the corresponding two out of ten outputs of the decoder, and the third and fourth inputs are connected to the control inputs of the summation and subtraction modes and the control inputs of the encoder, the input of the delay unit is connected to a separate speed control unit . .

Description

The invention relates to instrumentation, in particular to a magnetic recording technique. A device for indicating the position of a magnetic tape, containing speed sensors with magnetic tape, is connected via a pulse shaper to the input of a matching counter (divider), a ten-down reversing counter and a control unit. The disadvantages of the known device are the impossibility of fully infecting a magnetic field. tapes in absolute terms to its length, for example, meters, i.e. The known device cannot be used to provide a quick search with a high Accuracy of the beginning of the required section of magnetic tape; low noise immunity at the moment of switching on the modes of movement of the magnetic tape as well as when the tape-drive mechanism is stopped; the greater error in indicating the amount of magnetic tape when used in a magnetic recording apparatus, in which relatively large lengths of magnetic tape are used for recording information, the closest to the proposed technical essence and the achieved result is a device for indicating the amount of magnetic tape, a magnetic tape meter sensor connected with a tape mechanism connected through a pulse shaper to a matching counter input; The outputs with a tape mechanism and a relay coil, a key connected by control inputs with an output of a delay unit are the first, second and third counting and memorizing blocks connected to the initial installation bus, the display outputs of which are connected to the display unit, and mode control inputs summation and subtraction - with two ontact relays connected via a resistive divider. With a supply voltage bus 12.. A disadvantage of the known device is low noise immunity at the moment of switching on the movement mode of the magnetic tape and when the tape-drive mechanism is stopped in the Stop mode of operation of the magnetic recording apparatus. The purpose of the invention is to increase the noise immunity of the device for indicating the number of magnetic tapes in a magnetic recording apparatus. The goal is achieved by the fact that a device for indicating the amount of magnetic tape in a magnetic recording apparatus contains a magnetic tape meter sensor connected with a tape mechanism connected through a pulse shaper to a matching counter input, a control unit connected by outputs with a tape mechanism and a relay winding , keys connected by control inputs with an output of a delay unit, first, second and third blocks of counting and storing connected to the bus of the initial installation, display outputs which are connected to the display unit, and the inputs of the control of the summation and subtraction modes — with two relay contacts connected via a resistive divider to the supply voltage bus — the first, second and third pulse shapers are entered in duration, the outputs are connected respectively to the counting inputs of the first matching circuit, the second and third blocks of counting and storing, the control inputs of the summation and subtraction modes of which are connected via keys to the common contact of the relay, the input of the first pulse generator by the duration is connected: with the output of the matching counter, the inputs of the second and third pulse formers are connected respectively with the outputs of the first and second block transfer and storage signal formers, and in each counting and storing unit ten indication codes from the decoder are connected via an encoder and a delay circuit ten control inputs of the matching circuits, the outputs of which are connected to the ten windings of five polarized relays, through the contacts of which two outputs of the logic driver in connection with the ten inputs of the decoder, the first and second inputs of the transfer signal formers of the first and second counting and storing blocks are connected to the corresponding two of the ten decoder outputs, and the third and fourth inputs are connected to the control of the summation And subtraction and control inputs the encoder, the input of the delay unit is connected to a separate output of the control unit. In the drawing. The depicted diagram of the device. A device for indicating the amount of a magnetic tape — in a magnesium recording apparatus — contains a tape-testing mechanism 1 with magnetic tape 2, a sensor of 3 meters, a former 4; pulses, matching counter 5, the first - the third 6-8 pulse shapers by duration, the first third 9-11 counting and storing units, the display unit 12, the block 13-; control, relay 14, contact group 15 relay 14, bus 16 summation bus 17 subtraction, dual resistive divider 18, potential 1 and zero 20 bus supply voltage, delay block 21, first 22 and second 23 keys and bus 24 initial installation. Each counting and storing unit contains an encoder 25, a group 26 of ten delay circuits 27, a group 28 of ten coincidence circuits 29, a group of 30 of five polarized relays 3 each of which has the first 32 and second 33 windings and the first 34 and the second 35 contact groups, the logic driver 36, the decoder 37, and the transfer signal generator 38. A sensor 3 meters, whose output is connected to the input of the pulse former 4, whose output is connected to the matching input of the counter 5, the output of which is connected to the input of the first pulse former 6 pulses in duration, the output which is connected to the counting input of the first counting and storing unit 9, the signal output of which is connected to the input of the pulse shaper 7 in duration, the output of which is connected to the counting input of the second counting and storing unit 10 The signal output of which is connected to the input of the third shaper 8 pulses in duration, the output of which is connected to the counting input of the third account 11 and memorization unit. The display outputs of the counting and storing units 9-11 are connected to the corresponding input | Ca 054 of the display unit 12. The output control unit 13 is connected to the command inputs of the tape drive mechanism 1, with a relay winding 14; and an input of a delay unit 24, the output of which is connected to the control inputs of the keys 22 and 23. The resistive divider 18 is connected to the potential bus 19 of the supply voltage, and the outputs to the buses 16 summation and 17 subtract .-. tangles that are separately connected to two switching contacts of the contact group 15 of relay 14, the general contact of which is connected to the null bus 20 of the supply voltage. Bus 16 is summed via key 22, and bus 17 subtracting through key 23 is connected to the zero bus 20 of the supply voltage. Control inputs are connected to buses 16 and 17, respectively, by summing and subtracting blocks 9-11 of counting and storing. With the initial installation bus 24, the initial installation inputs of the counting and storing units 9-11 are connected. . In each of the counting and storing units, the ten outputs of the encoder 25 are connected to the inputs of group 26 of ten delay circuits 27, the outputs of each are connected to the first inputs of group 28 of ten two-input coincidence circuit 29, the second inputs of which are interconnected, and their point the connection is the counting input of the counting and storing unit. The outputs of group 28 of ten matching circuits 29 are connected to the windings of group 30 of five polarized relays 31, through ten contact groups of which two outputs of the logic driver 36 are connected to ten inputs of decoder 37. Ten outputs of decoder 37 are respectively connected The ten inputs of the encoder 25 and at the same time are the outputs of the indication of the counting and storing unit. The inputs for controlling the summation and subtraction of the connection block 51Y with two controllers; the inputs of PMfrator 25 and the first two inputs of the transfer signal generator 38, the other two inputs, which are connected to the last two outputs of the decoder 37. The output of the transfer signal generator 38 is the signal output of the counting unit and memorize. Consistently included blocks 9-11 of the account and memorize form

three decimal reversible counter. The counting and storing blocks are counting decades of this counter. Moreover, block 9 of counting and storing is a counting decade:; the younger bit of a three-digit decimal number, highlighted by three digital indicators of the display unit 12.

The device works as follows. In Stop mode, i.e. when the tape mechanism 1 is off and the tape 2 is stationary, the On command. There is no counter on the control inputs of keys 2.2 and 23. In this case, the keys 22 and 23 are closed and the summation buses 16 and 17 subtracts are shorted through them with a zero bus 20 of the supply voltage. The three-decade decimal counter is blocked.

The initial installation of the device is performed (if necessary) by submitting the appropriate command to the bus 24.

When the movement mode of the magnetic tape 2 is activated, a potential On command is received from a separate output of the control unit 13. the counter through the block 21 of the blocking delay of the decimal counter to the control inputs of the keys 22 and 23, which are opened.

Depending on the included direction of movement of the magnetic tape, a potential command is added. Summation over bus 16 or Subtraction on pin 17.

When the magnetic tape 2 is moving, the pulses from the output of the sensor 3 of the metering pass through the shaper 4 pulses to the counting input of the matching counter 5. The pulses at the output of this counter have a follow-up period proportional to 1 m of the moving magnetic tape. Formed by the duration of the pulses, the meter comes from the output of the imaging unit 6 pulses by duration to the counting input of the first counting decade (to the counting input of block 9).

 The counting and memorizing unit works in the following way.

The initial setup command sets all the polarized relays of the unit to a certain state. According to this state, a certain parallel ten-bit binary code is established on the common contacts of ten contact 5 groups of group 30 of five polarized relays 31, which are fed to ten inputs of the decoder 37; The logical signals for the formation of this code are represented by a driver 36,

10 On the inputs of the decoder 37, a parallel decimal code acts, which is fed to the corresponding ten inputs of the encoder 25, and is also used to control the digital

15 indicator of this bit.

In the absence of the Summation (Subtraction) command, the encoder 25 is turned off. This means that the signals on all ten of its outputs are absent, respectively, there are no resolving signals and on all the first inputs of the coincidence circuits of group 28 of the ten circuits 29 of coincidence. ; Let the next state of ten

25. Contact groups of 30 five polarized relays 31 correspond to the presence of the signal of digit 3 at the third output of the decoder 37. This signal goes to the third input of the encoder 25. Depending on how the command is generated (Summation or Subtraction), the encoder 25 generates a signal to one of its two respective outputs .. This signal

- a delayed signal arrives at the first input of one of the two corresponding coincidence circuits of the group 28 of the ten coincidences 29. After that, the counting and memorization unit is ready.

“To receive the next pulse 1 meter.

The incoming 1 meter impulse passes through the prepared matching circuit to one of the two windings 32, 33 of the corresponding polarized relay 31-. The relay pulse 1 meter switches to the second steady state. In this case, the parallel binary code changes on common contacts, ten contact groups of polarized relays 31 and, consequently, on the inputs of the decoder 37. As a result, a signal appears at the fourth output (including digit 4) of the decoder 37 when the summation mode is on or at the second output (including digit 2) of the decoder 37 when the subtraction mode is on.

Claims (1)

DEVICE FOR INDICATION ^: NUMBERS OF MAGNETIC TAPE IN A MAGNETIC RECORDING APPARATUS, containing a tape meter meter connected to the tape drive and connected via a pulse former to the input of the matching counter with the output of the delay unit, the first, second and third counting and storage units are connected to the initial setup bus, the indication outputs of which are connected to the indication unit, and in The sum and subtraction control modes are with two relay switching contacts connected via a resistive divider to the potential supply voltage bus, and the relay general contact is connected to the supply voltage zero bus, which is necessary in order to increase noise immunity, the first, second and third pulse shapers are introduced into it in duration, the outputs are connected, respectively, to the counting inputs of the coincidence circuits of the first, second and third blocks of counting and storing, control mode inputs the summation and subtraction of which are connected via keys to a common relay contact, the input of the first pulse shaper is connected by the output of the matching counter, the inputs of the second and third pulse shapers are connected respectively to the outputs of the shapers ® of the transfer signal of the first and second counting and memorizing blocks, and each block of counting and storing ten outputs of indications from the decoder are connected through an encoder and delay circuits with ten control inputs of matching circuits, the outputs of which rykh are connected to ten windings of five polarized relays, through the contacts of which two outputs of the shaper of logical signals are connected to ten inputs of the decoder, the first and second inputs of the shaper. The signal shifters of the transfer of the first and second counting and memorizing blocks are connected to the corresponding two out of ten outputs of the Decoder, and the third and fourth inputs are connected to the inputs of control of the summation and subtraction modes and the control inputs of the encoder, the input of the delay unit is connected to a separate control unit.