SU1007132A1 - Device for indicating of magnetic tape consumption - Google Patents

Abstract

A DEVICE FOR INDICATING A FLOW OF A MAGNETIC TAPE, containing coil speed sensors with magnetic tape, a switch, a first pulse shaper, a magnetic tape motion sensor connected via a second pulse shaper to a signal input of a frequency splitter, the output of which is connected to the count input of a binary counter, the pogram output terminals connected to information inputs of the memory register, and a block of indicators, characterized in that, in order to improve operational characteristics. tick, a one-shot, a rear edge of the pulses and three elements OR are entered into it, while the outputs of the sensors of the turns of the coils with magnetic tape are connected through a series-connected switch and the first pulse shaper to the control input of the memory register through the selector of the falling edge of the pulses and with the first triggering input of the radio-vibrator, the second auxiliary input connected to the output of the second forg "1 pulse generator, and the output with the installation input of the split frequency bodies, the first output of the memory register is connected to the first input of the indicator block and to the first inputs of the first, second and third ele (L cops, OR, the second output - with the second inputs of the first, second and third elements OR, the third output - with the third the inputs of the second and third 5 elements OR, the fourth output - with the fourth input of the third element OR, and the outputs of the first, second and third elements OR are connected respectively to the second, third and fourth inputs of the indicator block. CO 1C

Description

The invention relates to instrument making, namely, to devices for indicating duration and warning about the close end of a recording, and can be used in a memory recording apparatus. A device for indicating the end of a magnetic tape is known, comprising a lateral assembly speed sensor and a magnetic tape movement sensor coupled with its formers, pulses, a trigger, a pulse counter matching circuit and a UJ indicator. A disadvantage of the known device is that it provides the signaling of the end of the magnetic tape without prior indication of its consumption. And it is necessary in the indication of the flow of the magnetic tape until the signaling of its endings is turned on, since the current stock of magnetic tapes allows the operator, in particular, to ensure the normal functioning of the equipment and to prepare in advance for the end of the tape magnetic carrier (or its individual recording tracks), as close as possible Essentially, the invention is a device for searching a recording area on a magnetic medium, which also carries out flow and end indication of the magnetic tape and contains sensors for rotating the coils of the magnetic tape (each of which includes a code disk attached to the corresponding side node and located between the respective light source and photoreceiver), the switch, the first pulse shaper, the magnetic tape motion sensor (consists of a rotating bypass roller, attached to its ovym disk disposed between the light source and photodetector) connected via a second pulse generator to the input of the divider, binary counter C23 and the block indicator. The disadvantages of the known device are that it has a relatively large error in indicating the flow rate of the magnetic tape, is characterized by an insufficiently simple and arduous form of presenting information about the flow rate and the ending of the exact magnetic carrier. The aim of the invention is to improve its performance. The goal is achieved by the fact that the device containing the sensors of turns of the coils with magnetic tape, the switch, the first pulse picker, the magnetic tape motion sensor connected through the second pulse shaper to the signal input of the frequency divider, the output of which is connected to the counting one. A binary counter, outputs located at the bit connected to the information inputs of the memory register, and a block of indicators, a one-shot, a rear edge selector of the pulses and three OR elements are inserted, while the outputs of the speed sensors X1 are connected to the magnetic tape through a series-connected switch and the first driver 1 mplus with a control input of the memory register, with an installation input of a binary counter through the pulse edge selector and with the first trigger input of the one-shot, the second auxiliary The first input of the memory register is connected to the first input of the indicator unit and to the first inputs of the first, second and third elements I | 1I-, the second output with the second inputs the first, second and third elements OR, the third output - with the third inputs of the second and -the circuit elements OR, the fourth output - to the fourth input of the third element OR, the fourth output - with the fourth input of the third element OR, and the outputs of the first, second and The third OR elements are connected respectively to the second, third and fourth inputs of the indicator block. FIG. 1 shows a functional diagram of the device $ in FIG. 2 shows temporary diaphragms explaining how the device works. A device for indicating the consumption of magnetic tape 1 located on coils 2 and 3 in a tape drive mechanism of a magnetic recording apparatus (not shown) contains sensor A of turns of coil 2, sensor 5 of turns of coil 3, sensor 6 of movement of magnetic tape 1, switch 7, first 5 and second 9 pulse shapers.

frequency divider 10, one-shot AND selector of the falling edge of pulses binary counter 13, memory register C, multivibrator 15, first .16, second 17 and third 18 OR elements and indicator block 19 consisting of first 20, second 21, third 22 and fourth 23 indicators. (for example, LEDs).

The device works as follows.

. C1 switch 7 connects to the input of the imager 8 pulses the speed sensor of the supply coil. For example, when the magnetic tape 1 moves in the direction in which it is rewound from the coil 2 to the coil 3, the output of the speed sensor will be connected to the input of the pulse shaper 8.

We consider the operation of the device from the moment when the entire supply of magnetic tape 1 is on the supply coil, i.e. there is a maximum diameter roll of magnetic tape.

Each sensor t and 5 turns in the proposed device is made up of a permanent magnet mounted on a rotating side node and interacting with a reed switch, which forms the output signal of the sensor and is fixed near the side node. At the same time, the reed switch is triggered once per turn of the side node, i.e. coils with tape mounted on this node.

The pulse shaper 8 converts the signals from sensors 4 and 5 turns into square pulses with the necessary parameters (the signal at the shaper 8 output is a diagram a, Fig. 2).

After the beginning of the movement of the magnetic tape 1 in the path of the tape mechanism of the magnetic recording apparatus, i.e. after the start of rotation of the supply coil at the output of the imaging unit 8, the first pulse starts up, which triggers the one-shot 11. At the output of the one-shot (positive pulses in diagram b, Fig. 2). an impulse is formed, the duration of which is equal to the duration of the shortest in duration of the rotation of the supply coil, which it performs when there are several turns of magnetic tape 1 on it.

At the time of termination of the short output pulse of the driver 8

A trailing edge selector 12 generates a short pulse, which sets the binary counter 13 to the zero state. In order to form the output pulse in the one-shot 11, a relatively high-frequency sequence of pulses from the motion sensor 6 is obtained at the output of the pulse shaper E. This ensures the automatic preservation of proportionality between the duration of the output pulse of the one-shot 11 and the linear velocity of the magnetic tape in the path of the tape mechanism. In this case, the one-shot 11 is performed containing, for example, a series-connected pulse counter and a trigger. The one-shot works as follows. The output sequence of pulses of the formative 9 is fed to the counting input of the counter (the second, auxiliary input of the one-shot 11). A short trigger pulse from the output of the imaging unit 8 is supplied to the installation (to the zero state) input of the counter and to the first input of the trigger. This trigger is switched and the front of the output pulse of the one-shot 11 is formed at its output. The counter counts the output pulses of the driver 9. After some time. the time determined by the required duration of the output pulse of the one-shot 11 and equal to the product of the time interval following the output pulses of the driver 9, installed on the counting module of the one-shot counter 1 1, at the output of this counter appears a pulse that resets the trigger of the one-shot 11 to its original state. At the output of this trigger, the back, front of the output pulse of the one-shot 11 is formed.

The output pulse of the one-shot 11 is set to the zero state frequency divider 10. The frequency divider 10 remains locked in this state for the duration of the output pulse of the one-shot 11.

After the end of the output pulse of the oscillator 11, the frequency divider starts to work and on its output (chart B, Fig. 2) there appear pulses that are counted by a binary counter 13. 51 The sequence of pulses at the output of frequency divider 10 ends when the next pulse appears From the feed coil speed sensor, the next, second, after the tape begins to move, the output pulse of the windrower 8, with a leading edge, starts the one-shot 11 and writes to the memory register k a parallel binary output binary code counter 13. On the falling edge of this pulse, binary counter 13 is reset, and so on. Thus, the binary counter 13 has the ability to count the pulses generated by the frequency divider in the time interval (which we call the measurement interval) from behind the front of the output pulse of one vibrator 11 and to the leading edge of the next output pulse of the turns of the feeding coil. In other words, the measurement interval in duration is equal to the difference between the duration of a given revolution of the supply coil and the duration of one revolution of the supply coil with a minimum number (several turns) of a magnetic tape wound around it. The ratio of the pulse frequency of the motion sensor in divider 10 is calculated so (for the device variant considered for example) that over the maximum measurement interval on the counting input of the binary counter 13 received fifteen pulses. So after the end of the first (and after the end of a series of subsequent measurement intervals), the maximum by the duration of the measurement interval, the binary code 1111 is recorded in the memory register k, since the binary counter 13 counts fifteen pulses for this measurement interval. In this case, all the outputs of the memory register T, and, consequently, at the outputs of the elements OR 16, 17 and 18, potential signals are established. As a result, in the block of indicators 19 all its indicators 20, 21, 22 and 23 are turned on. Memory register 1 is designed to store information 2 "about the current stock of the magnetic tape on it in the time interval between adjacent pulses of the rotational speed sensor of the supply coil. During the movement, the magnetic tape 1 is gradually unwound from the supply reel. At the same time, the duration of the turns of the supply coil is gradually reduced and, accordingly, the duration of the measurement interval is reduced (since the duration of the output pulse of the one-shot 11 at a uniform linear speed of the magnetic tape remains unchanged). In accordance with this, the number of pulses in the stack that have time to enter a counter input of a binary counter 13 for the measurement interval. The proposed device differs from the known simple, very arduous and at the same time quite informative and accurate way of indicating the consumption of a large amount of magnetic tape. This method consists in the fact that information on the current stock of magnetic tape in the form optimal for the operator is created by switching on in a certain way, for example, at least four separate indicators. In this case, the algorithm for turning off the indicators depending on the stock of the magnetic tape is as follows. As the magnetic tape is consumed, at the same time, the light of the first vehicle all is first 23, second 22, third 21 and fourth 20 indicators, then second 22, third 21 and fourth 20, then third and fourth and then only one fourth indicator, respectively, when On the feeding coil there is a magnetic tape, not less than (approximately) 1 / 2,1 / t, 1/8 AND 1/16 of its maximum. quantities in the proposed tape drive mechanism. The state of the block of 19 indicators (all four of its indicators are on) does not change until the interval duration is more than doubled, since when writing codes 1111 to 1000 in register 1 of the memory (eight pulses counts binary counter 13) the output status of all the elements OR 1b, 17 and 18 does not change. When the duration of the measurement interval is reduced by more than two times, a packet of pulses occurs on the counting input of the binary counter 13, consisting of yxte of seven pulses, and a parallel code 0111 is entered into the register I of the memory. From such a code at the outputs of the register 13 memory and up to code 0100 "a block of 19 indicators simultaneously includes only the first three of its indicators 22, 21 and 20, since there will be potential signals at the output of the element OR 16 (diagram d, Fig. 2), at the output of the element OR 17 (diagram e, fig, 2) and at the output of the element OR 18 (diagram ma d, Fig. 2). Next, the device works in the same way (diagram b, g, fig. 2) after the measurement interval becomes shorter than the pulse period at the output of frequency divider 10 (the end of the beat diagram of fig. 2). there is no signal (binary code unit) and at the output of the low-order bit of register 1 of the memory. The fourth indicator 20 of the block 19 can be controlled, for example, by a pulse signal of the Multivibrator 15, arriving at the input of the element OR 16 (the end of the diagram g, 1 Fig. 2), i.e. will blink. The flashing of four of that indicator of block 1E draws the attention of the operator to the fact that the recording of information in the given direction of movement of the magnetic tape ends. The invention provides improved operational, namely, ergonomic characteristics of the device for indicating the consumption of a magnetic tape. At the same time, due to the presentation of information on the consumption of a magnetic tape in the form of an in-depth picture, which is created by a number of individual indicators that are included in a certain way, the use of the device reduces the time for the operator to perceive the results of indicating the consumption of magnetic tape. And the fact that the change in this picture begins only after a half-consumption of the magnetic tape and the frequency of these changes increases towards the end of the magnetic tape on the supply coil, allows the operator to be less distracted to observe the flow of the magnetic tape when it is still is significant.

Claims (1)

DEVICE FOR INDICATING MAGNETIC TAPE CONSUMPTION, comprising coil speed sensors with magnetic tape, a switch, a first pulse shaper, a magnetic tape motion sensor connected through a second pulse shaper to a signal input of a frequency divider, the output of which is connected to a counting input of a binary counter, and outputs of a bit-wise connected to information inputs of the memory register, and a block of indicators, characterized in that, in order to improve operational characteristics. a teak, a single-vibrator, a trailing edge selector, and three OR elements are introduced into it, while the outputs of the revolution sensors of the coils with a magnetic tape are connected through a series-connected switch and the first pulse shaper with a control input of the memory register, with the setting input of the binary counter via a selector of the trailing edge of the pulses and with the first triggering input of the one-shot, the second auxiliary input connected to the output of the second pulse forwarder, and the ~ output - with the installation input of the divider pilots at the first memory register output connected to a first input of the display unit and to the first inputs of the first, second and third elements. OR, the second output — with the second inputs of the first, second, and third OR elements, the third output — with the third inputs of the second and third OR elements, the fourth output — with the fourth input of the third OR element, and the outputs of the first, second, and third OR elements are connected respectively to second, third and fourth inputs of the indicator block. So yo 1 '