SU966726A1 - Magnetic recording apparatus - Google Patents

Description

(5) MAGNET RECORDING DEVICE

one

The invention relates to instrumentation, in particular, to a magnetic recording technique, in particular, to magnetic recording and information reproducing devices, and can be used in equipment recording information on a magnetic tape.

A magnetic recording device comprising a magnetic tape reversing tape mechanism mounted on recording and reproducing thread heads connected to recording and reproducing units and a control unit is known.

The disadvantages of this device are that, if for various reasons there are stops of the tape mechanism in the recording mode, sections of the magnetic tape tracks unused for recording remain in the device, and in the playback mode the recorded information is partially reproduced. The disadvantages are due to the implementation of the inherent ribbon. a predetermined mechanism of certain time intervals equal to the duration of the deceleration time and the time of the subsequent (after stopping) acceleration of the magnetic tape to the nominal operation of whose speed during which information is not recorded during playback of previously recorded information.

The closest in technical essence to the present invention is a magnetic recording apparatus containing a reversing and high-speed tape mechanism (includes two control mark forming units combined on the output by an OR element, the output of which is the first output of the tape mechanism) magnetic tape, magnetic recording and reproduction heads mounted on it, connected to recording and reproducing blocks (the block includes a recording switch. And the reproducing block is a switch REFERENCE), and connected to ne vym output of the deck control unit (selection unit comprises tracks monostable multivibrator, a delay line and a trigger) which outputs a group associated with "the gate inputs (inputs of switches) recording blocks and vosproizbedoni C2. The disadvantages of the known apparatus are the low efficiency of the use of the magnetic tape during recording and the presence of loss of the recorded information when playing under the conditions of the apparatus with multiple stops of its high speed tape mechanism, due to the fact that in the known apparatus the track sections remain tapes that could not be used to record information or did not participate in the playback process and that occur when the new and repeated nycK & jf. the tape mechanism (especially high speed) due to the implementation of a certain path of the magnetic tape during the deceleration and the acceleration path of the tape during its gathering at a high nominal operating speed. The purpose of the invention is to increase the efficiency of using a magnetic tape when recording and to reduce information loss under the conditions of multiple stops of a tape drive mechanism. The goal is achieved in that a magnetic tape recorder containing a reversible and high-speed tape drive magnetic tape drive, magnetic recording and reproduction heads connected to the recording and reproducing blocks, and connected. A control unit whose output group is connected to the control inputs of the recording and playback units is connected to the first output of the tape-testing mechanism. The first trigger, switch, OR circuit and rear-edge selector of the command front, the second trigger, switch, rear circuit are entered. command front, as well as a logic unit with two outputs and seven inputs, the first of which is connected to the first inputs of the triggers and a separate output of the control unit, one output from the group of outputs of which is connected to the second input of the logical block and the control inputs of the switches, the outputs of which are connected to the second inputs Tpi rrepoB connected by outputs to the third and fourth inputs of the logic unit, the fifth, sixth and seventh inputs of which are connected to the second, third and fourth outputs of the tape mechanism, connected by two command inputs through the OR circuit with separate second and third outputs of the control unit, with this logical block, the first output is connected directly to the second input of the first OR circuit and through the first selector of the falling front of the command with the second input of the first and the first input of the second switch, and the second output directly with the second input of the second OR circuit and through the second selector of the falling front of the command with the first input of the first and second input of the second switch. FIG. 1 is a functional diagram of the described magnetic recording apparatus; FIG. 2 is a diagram of the logic unit used in the device. The proposed magnetic recording apparatus comprises a reversing and high-speed tape mechanism 1 with magnetic tape 2, magnetic recording and playback heads 3, a recording information input bus 5, a recording unit 6, a playback unit 7, a playback output bus 8, a control unit 9. first 10 and the second 11 schemes OR, the first 12 and second 13 triggers and logic block 1t ,. containing the first 15 second 16, third 17, fourth 18, fifth 5, sixth 20 and seventh 21 inputs and the first 22 and second 23 outputs. In addition, in the proposed apparatus, the first 24 and second 25 rear edge selectors of the command and the first 26 and second 27 switches are used. A diagram of the logical unit 1k of a magnetic recording apparatus made on the logical elements is shown in FIG. 2 and contains NOT 28-30 circuits, AND 31-36 circuits, and OR 37 38 circuits. Logic block 14 can be executed AND on. the basis of a programmable logic array, for example, is a type of programmable read-only memory (PROM) K556PT4. The information input bus 5 is connected to the information input of the recording unit 6, the outputs of which are connected to the magnetic recording heads 3. The magnetic playback heads are connected to the inputs of the playback unit 7, the output of which is connected to the information output bus 8. Magnetic recording heads 3 and playback Cs are mounted on a tape mechanism 1 and are coupled with a magnetic tape 2 moving in its path 2. First output of tape mechanism 1 (signal output The end of the tape is connected to the input of the control unit 9 first separate output of the second (output the Stop command is connected to the first input 15 of logic unit 1, the first input of the trigger 12 and the first input of the trigger 13. The second separate output (output of the command “Move forward”) of the control unit 9 is connected to the first input of the OR 10 circuit, and the second separate output ( you The command Backward) of the control unit 9 is connected to the first input of the circuit OR 1 The outputs of the circuit OR 10 and 11 are connected to the First and second command inputs of the tape drive mechanism 1 respectively. The output group of the control block 9 (the outputs of the parallel binary control code of the switching the magnetic tape 2 recording-replay tracks are connected respectively to the control inputs of the recording unit 6 and the control inputs of the playback unit 7- One output from this group of outputs of the control unit 9 (the output of the lower half of the pair It is connected to the second input 1b of logic unit 1, the control input of the switch 26 and the control input of the switch 27. The output of the first switch 2b is connected to the second input (installation) of the first trigger 12, and the output of the second switch 27 is connected to the second input Home (installation) of the second trigger 13- The outputs (direct) of the triggers 12 and 13 are connected to the third 17 and fourth 18 inputs of the logic block k, respectively. The fifth 19, sixth 20 and seventh 21 inputs of logic unit C are connected respectively to the second output (output of the potential signal Direction back), the third output (output of the potential signal Speed is nominal) and the fourth output (output of the potential signal Direct direction) of the tape drive mechanism 1. The first output 22 (the output of the Motion 6 command is straight forward for rollback) of the logic unit T is connected to the second input of the OR 10 circuit and the input of the selector of the falling front of the 2k command. The second output 23 (the return motion command output (for rollback) is connected to the second input of the OR 11 circuit and the rear edge selector input of the command 25. The output of the selector, the rear edge of the 2k command is connected to the second input of the switch 26 and the first input of the switch 27, and the output of the rear selector the front of the command 25 is connected to the first input of the switch 26 and the second input of the switch 27. The switches 26 and 27 can be assembled on the basis of logic circuits 2I-2IL.The device works as follows. High-speed tape mechanism 1 transports a magnetic NU 2 with a high working scraper (equal, for example, 3 m / s) in the Direct direction and in the Return direction. Each time at the end of the magnetic tape T during its movement in the direction of Reverse, the tape drive mechanism 1 forms on its first output signal The end of the tape, which enters the control unit 9. The control unit 9 by the signal The end of the tape switches the direction of movement of the magnetic tape 2 in the tape drive mechanism 1 and generates control signals in the form of parallel binary codes that enter the recording blocks 6 and unit 7-. These signals are used to turn on the corresponding magnetic recording heads 3 at the output of recording unit 6 and the magnetic heads of reproduction k at the input of reproducing unit 7 Recorded information is fed to the input of recording unit 6 via bus 5. Reproducible information is fed to the output of the device, from the output of the reproducing unit 7 via bus 8. The device performs long-term and continuous recording of information by sequentially recording it on the by-used tracks (or groups, tracks) reversed at the ends of the magnetic field. nd belt 2. Likewise, may be carried out and reproduction of the recorded information. The working stroke of the magnetic tape 2 is turned on / off by the command Move forward or Backward, which are formed by the control unit 9 and received from its second and third moves to the first and second command inputs of the tape drive mechanism 1, respectively, through the circuit OR 10 and the circuit OR 11. During the movement of the magnetic tape 2 from the working speed and, depending on the direction of its movement, potential signals are formed on the second, third and fourth outputs of the tape-breaking mechanism 1, respectively. Return direction, nominal speed or not. the board directly. In the absence of commands, Motion Direct and Movement Back, i.e. when the tape drive is turned off (stopped), the Stop command is set at the first output of the control unit 9. To eliminate the effect of long-term acceleration and deceleration of the magnetic tape on the technical and economic characteristics of the magnetic recording apparatus in the proposed apparatus, each time the tape-drive mechanism is turned on, as well as when the power supply of the apparatus is turned on, the magnetic tape fails for the required distance in the opposite direction. (low bit of the output code of the control unit) direction. In this case, the algorithm of operation of the apparatus after turning on the working stroke of the magnetic tape 2, for example, in the direction of Pryo next. On the leading edge of the Stop command, the tape movement mode is activated in the Return direction. In this case, the magnetic tape first brakes, and then after it stops completely, it begins to accelerate in a given direction back. After the tape reaches its nominal operating speed in this direction, the tape moves in the direction of the right. The magnetic tape is braked and then reversed. When the signal then appears. The direction of the direct-belt mechanism 1 stops completely. The apparatus works in a similar way when the operating mode of the movement of the magnetic tape is turned on in the reverse direction. The Stop command turns on (unlocks) the logic unit 14. From the leading edge of the Stop command, the triggers 12 and 13 are activated (switched). 9 6 The low bit signal of the output parallel binary code of the control unit 9 is additionally used in logic block 14 (it goes to its second input 16) and to control the switches 26 and 27- Let the low (zero) level of the low-order signal (no signal) correspond to the direction of movement of magnetic tape 2, and the high (potential) direction of the direction of movement of magnetic l Bags 2 in the path of the tape drive mechanism 1. The output Parallel binary code of the control unit 9 and, in particular, the state of its low-order bit do not change after a temporary, for example, accidental power outage of the apparatus. In the absence of a signal at the control input of the switches 2b and 27, the outputs of the switches are connected to their first inputs. And if there is a potential signal at the control input of the switches 26 and 27, the outputs of the switches are connected to their second inputs. In the process of performing rollback, the Vk block operates as follows. The magni on tape 2 moves at a working speed in the direction of Prmo. At the same time, potential signals are present. The speed is nominal and the direction is direct, respectively, at inputs 20 and 21 of logic unit 14. Immediately after switching on the operating mode of movement of the magnetic tape, the first input 15 of logic unit 14 receives the Stop command, which unlocks all circuits 31-36. The inputs 17 and 18 of the logic unit receive potential signals from the outputs, respectively, of the flip-flops 12 and 13 of the device, cocked by the Stop command. There is no signal at input 16 of logical blek 14 (the forward direction is set), and therefore a potential signal is established at the output of the inverter 28. The magnetic tape still continues to move at a speed close to the nominal one. In logic unit 14, the first AND 35 triggers, the output of which passes through the OR circuit 38 to the output of block 23. Further, this signal as a command Backward movement (for rollback) goes through the circuit OR 11 of the apparatus to the second command input of the tape drive mechanism 1 and switches on the mode of movement of the magnetic tape 9 in the Back direction. The magnetic tape 2 is braked after some time after the start of which the signal is received. Nominal speed. In this case, the second coincidence circuit BZ triggers, the output signal of which maintains the switched on mode of movement of the magnetic tape in the Return direction during the subsequent acceleration of the tape in this direction. As a result of deceleration, the magnetic tape stops completely and then begins to accelerate in the direction of Return. The signal Direction is taken straight ahead and a signal Direction is set back at input 19 of the logic block Tt. The circuit 35 switches off. After the tape reaches the nominal operating speed in reverse direction, a signal appears again. The speed is nominal at the input 21 of the logic unit. In this case, the signal at the output of the inverter 30 is removed, as a result of which the AND 36 circuit is turned off. The command Backward movement (for rollback) is removed from the output 23 of the logical block k. At the end of this command, the selector 25 generates a short pulse, which, via switch 2b, resets the first trigger 12 to its initial state. This establishes a potential signal at the output of the NOT circuit 29 logic unit and the output signal of the circuit 33 and passes through the circuit OR 37 to the output 22 of the logic block. Further, this signal as a command. The forward movement (for rollback) goes through the OR 10 circuit of the device to the first command input of the tape drive mechanism 1 and switches on the movement mode of the magnetic tape 2 in the Direct direction. There is a braking tape. After stopping it completely and then changing its direction of movement, the signal is Direction Direct. Signal Direction back is respectively removed. In this case, Scheme I 33 disables the Motion direct (for rollback) command from the output 22 of the logic block 14. At the time of the end of this command, the selector generates a short pulse, which through switch 27 resets (switches) second

swarm trigger 13 to its original state. The tape drive mechanism 1 stops.

Claims (2)

loss of information during reproduction in the conditions of multiple stops of the tape mechanism, in ap26. In the process of automatic execution in a similar manner of rollback of the MANITIAL TAPE after switching on the operating mode of the tape movement in the Back direction, the other three schemes AND 31, 32 and 3 of the logical block are involved. The technical and economic efficiency of the present invention is to increase the efficiency of using a magnetic tape during recording and to reduce the loss of recorded information when playing a magnetic recorder with multiple stops of its high-speed tape mechanism, which are achieved as a result of the automatic implementation of magnetic recoil in the proposed device. tapes each time when the tape mechanism stops and when the power supply is turned on. well, exceeding the total length of the path of the magnetic tape run-out during its braking and the path of the subsequent acceleration of the tape to a high nominal operating speed. In the continuous playback mode, in the presence of random temporary power cuts, the proposed apparatus provides playback without loss of the entire volume of recorded information, which is especially important in cases of periodic use in the recording equipment of an automatic one-time full reproduction of valuable information recorded during a unique experiment by remotely controlled magnetic equipment. records The invention The magnetic recording apparatus, comprising a reversing and high-speed tape mechanism with a magnetic tape, magnetic recording and playback heads connected to recording and reproducing units and connected to a first output of a tape driving mechanism a control unit, a group of outputs of which is connected to control inputs recording and reproducing blocks, characterized by the fact that, in order to increase the efficiency of the use of a magnetic tape during recording and to reduce 96parates, the first trigger of comm the tator, the OR circuit and the front-edge selector of the command, the second trigger com, the mutator, the OR circuit and the front-edge selector of the command, as well as a logic unit with two outputs and seven inputs, the first of which is connected to the first trigger inputs and a separate output control unit, one output from the group of outputs of which is connected to the second input of the logic unit and control inputs of the switches, the outputs of which are connected to the second inputs of the flip-flops connected by the outputs to the third and fourth inputs of the logic unit, fifth, sixth and the seventh inputs of which are connected to the second, third and fourth outputs of the tape mechanism connected by two command 12 inputs through the OR circuit with separate second and third outputs of the control unit, while the logic block with the first output is connected directly to the second input of the first OR circuit and The first selector of the falling edge of the command with the second input of the first and the first input of the second switch, and the second output - directly with the second input of the second OR circuit and through the second selector of the falling front command s to a first input of a first and a second input of the second switch. Sources of information taken into account during the examination 1. USSR author's certificate Vf 336692, cl. G 11 B 15/18, 11.06.70. 2. For the USSR № 2759968 / 18-10, “l. G 11 5/00, 11/26/1979 (prototype). 5 o Oh oh 15 j3 CD A y / | Sp: P Pc n / / 1L   - -k ../. f5 f 26 I THEM