SU878709A1 - Apparatus for winding magnetic tape into cassette - Google Patents

Description

The invention relates to the field of instrumentation, more specifically to apparatus for winding a magnetic tape in a cassette.

A tape winding apparatus is known; into a cassette, containing: a tape-carrying mechanism, including a feeding reel and a receiving cassette, kinematically connected to the shafts of the first and second motors, respectively, connected to the corresponding power amplifiers, a frequency sensor of the tape speed connected to the first (by the input of the tape speed change unit and with the clock input of the tape length counter house, and the command block, the first output connected to the reset input of the tape length counter 1.

The disadvantage of this apparatus is that. that after working out a stop winding command, the tape reel cannot be stopped instantly, because of which the belt runs out, which is larger there, the higher the winding speed. The run-down may be several meters. It is impossible to sharply slow down the movement of the magnetic tape, as this may cause damage to the tapes, especially tapes with a width of 3.81 mm and a thickness of several microns.

The purpose of the invention is to improve the quality of winding.

This is achieved by the fact that the device has three decoders, an OR element and two AND elements, and the densers are connected in parallel to the outputs of the tape length counter, the inputs of the OR element are respectively connected with the first output of the tape speed measuring unit and the second output coma unit, and the output element OR - with the first input of the first element, the second input of which is connected to the third output of the command block, and the output to the first power amplifier, and the output of the first decoder connected to the input of the command block, direct outputThe second and inverse outputs of the third encoder are connected via the second element I to the second input of the tape speed measuring unit, the third and fourth inputs of which are respectively connected to the second and second outputs of the third decoder, and the input of the second power amplifier is connected to the third output of the command block.

The drawing shows the scheme of the proposed device.

The device contains a tape mechanism with a razlolozheinggm. And on it is a receiving cassette 1 and a feeding coil 2 with a magnetic tape 3. The receiving tape 1 and the feeding coil 2 are kinematically connected with 30

with electric motors 4 and 5, which are connected to the first and second power amplifiers 6 and 7, representing current key elements. In addition, a frequency sensor 8 for the speed of the lanta, kinematically connected: located with a magnetic tape 3, is located on the tape drive mechanism. The frequency sensor 8 consists of a roller 9, a magnetic lead 3 driven on a shaft, with a toothed disk 10 mounted on it, a system consisting of a light bulb 11 and a phototransistor 12, and a driver 13 pulses. The diameter of the driven roller 9 and the number of teeth of the disk, 10 are chosen so that each signal of the phototransfer 12. received and cut into the teeth of the disk 10 of the beam of the lantern 11 corresponds to the length of the magnetic tape 3, convenient for counting, the imaging unit 13, for example, one a vibrator, intended for forming a short duration impulse, which is used to measure the length of a magnetic tape and for measuring the speed of movement of the tape in the tape speed measuring unit 14. The tape speed measurement unit 14 consists of a generator of 15 stable frequency pulses, connected to the output of the input C of the counter 16, which is connected to the second, fourth and shkoTOiMy inputs of the ZI-17 element by its three discharge outputs. ZI-OR 17 is designed for selective transmission, depending on the enabling signal at the first, third or fifth inputs, the frequency of the signal at its output, and is connected to the inputs of the setup S and informational D trigger 18 and the input of the Overlap of the generator 15. the reset stroke R of the counter 16 and the clock input C of the trigger 18 are connected to the output of the driver of the 13 pulses of the frequency sensor 8. The speed measurement unit 14 is designed to compare the reference frequency and the frequency of the signals of the frequency sensor 8 with the trigger 18. set value. The command unit 19 may consist of two triggers 20 and 21 and a delay element 22. The trigger 20 is designed to fix the process of stopping the movement of the tape in the apparatus, and the trigger 21 to fix the presence or absence of movement of the tape & ny in the apparatus. The delay element 22 is designed to interrupt the process of stopping and moving after the time required for a complete cessation of movement after the arrival of a stop command, and its output is connected to the reset inputs R of flip-flops 20 and 21. Inputs C of flip-flops 20, 21 are connected to the first terminal on which a reset signal must be received (for example, from a button), and the inputs D of these triggers are connected to the second terminal with a potential of zero. Input 5 of the trigger 21 is connected to the third terminal. The start of the movement} L1. The output of the trigger 21 is connected to the input of the first power amplifier 6 and the second input of the first element I 23, which is connected to the output of the second power amplifier 7. In addition, the device contains a tape length counter 24 connected to the clock input C to the output of the frequency sensor 8, the reset input R- to the nerve output (terminal) of the reset in the command unit 19, and its bit outputs to the inputs of the first, second "third decoders 25-27. The direct output of the first decoder 25 is connected with the input of the delay element 22 and the installation input S of the trigger 20 in the command block 19. The direct output of the second decoder 26 and the inverse output of the third decoder 27 are connected to the first and second inputs of the second element And 28. The inverse output of the second decoder 26, the output of the second element P 28 and the direct output of the third decoder 27 are connected respectively with the first, third and fifth inputs of the ZI-OR element 17 in block 14. The output of block 14 (inverse - output trigger 18) direct output of trigger 20 are connected respectively first and second Rin-odes element 29 which is connected with the output of the first input of the first AND gate 23. A second decoder 26 is designed to generate the inverse output of the motion command at a high speed and relieving this command to GDS to-end length of the fill emoy remains several meters. The third decoder 27 is designed to generate, at the exit point, the command of a twi-play with a minimum speed. The second element And 28 is intended to form a command of movement with n-intermediate between maximum and minimum speed. The first decoder 25 is designed to generate a stop motion signal. In order for the cheap ifrafts to work, it is necessary to connect their inputs to the outputs of counter 24 so that if any decoder has worked, then it must keep its state until the counter 24 is reset. The connection of the outputs of counter 24 and decoders 25, 26 , 27 is determined by the desired length of the filing of the magical tape.

Annarath works as follows.

In the initial state, the magnetic tape 3 is loaded into the path of the tape-stretch mechanism and connected to the right-hand reel of the cartridge 1, and the first lemma of resetting the command unit 19 receives a pulse, which sets its triggers 20, 21 and counter 24 to zero , and it means that at the direct outputs of the descramblers-25, 26, 27 there will be levels “O. The signal from the third output of the command block

19 turns off the power amplifiers 6 and 7, and from the inverse output of the second decoder 26, the enabling level “1. So, as soon as the output of the frequency sensor 8 to the first input of the block 14 pulses: do not stop, then the level of "O" is set at its output, i.e., the speed is lower than the specified one. To start the movement to the third terminal of the command block of block 19, an imllus enters, which sets the trigger 21 to the state "1" and turns on the power amplifier 6 at the third output of the command block. The shaft of the electric motor 4 then begins to rotate and accelerate into the cassette 1 magnetic tape 3 with the acceleration. At the same time, the power amplifier 7 is turned on, so that the signal "1. The acceleration process continues until the frequency of the signals from the output of frequency sensor 8 exceeds the frequency set by generator 15, counter 16, and Z-OR element 17 of block 14. Once this happens (i.e., as soon as the speed will exceed the settable), at the output of the block 14, the level “1” will be set, which will go through the elements OR 29, And 23 and turn on the amplifier 7 of the power. As a result, deceleration will begin, which continues until the frequency of the slave frequency sensor 8 is below the setpoint. Thus, the speed of the MarHnfHoft tape 3 is controlled. In the process, the output of the frequency sensor 8 o is the signals of accumulates the counter to 24. When the outputs of the counter 24. connected to the inputs of the second decoder 26, in TC uvOV.ni "1, the decoder 26 is set to one state. In this case, the fourth input of block 14 will receive a signal with the level “O, and the third input will receive a signal from the second element I 28 with the level“ 1. The given frequency will decrease by a factor of two times, and therefore the steady-state speed will decrease by the same time. When signals with levels of "1" at the outputs of counter 24 connected to the inputs of the third decoder 27 are transmitted, then at the direct output of the decoder 27 the signal will be set to state "1, and at the output of the second element I 28 to" O " . As a result, the minimum speed will be set until the signal levels at the first decoder 25 match. At the same time, the signal at the output of the decoder decoder 25 sets the trigger 20 to the state 1 and arrives at the delay element 22, signal "1 from the second output of the command block 19 passes

through the elements OR 29, and 23 and includes

power amplifier 7 for braking the engine. The stopping process occurs until the delay element 22 arrives at the reset inputs R of the 2: 0 and 21 flip-flops, causing the power amplifiers 6 and 7 to turn off, and the movement to stop. After this, a magnetic lect 3 can be used to perform other operations, such as cutting it and connecting to the left coil of the cassette 1, and then installing the new cassette and refilling it.

The economic effect of using the device is determined by high accuracy.

measurements at high tape rewinding speed.

Claims (1)

1. US Patent No. 4062719, cl. 156502, 1977.