DE2043095C3 - Magnetic tape labeling device on a key-operated typewriter - Google Patents

Description

apply a single bit to the data track. The position of this bit on the data track is used for Identification of the character. This position is represented by an assigned type wheel.

In contrast to this known device, in the device according to the invention, which A key-operated typewriter with a continuously rotating type carrier is based on a certain one; Character initially defined by the time at which a key impulse occurs with respect to the previous angular momentum has elapsed, the character momentum form a time base. If this point in time is assumed, then according to the invention intended sequence of further events essentially in that the character in question immediately, d. H. without the support of the arithmetic unit of an electronic data processing system, is brought onto the magnetic tape, in coded form.

The inscription device according to the invention enables character-by-character serial writing a cassette magnetic tape, so does not require a storage device that is more than just to be written to Must store characters, and ensures a step-by-step traversal of the magnetic tape with the help of simple mechanical devices that require neither a motor nor a clutch and controlled by the signals from the logic circuits of the machine.

The device according to the invention uses the rotation and drawing pulses of the disk machine on the one hand, to print out the typed characters and, on the other hand, to encode the characters in binary Implement signals, using a second group of logic circuits, which is also the coding circuit and which takes some signals from the first group of logic circuits, also known as the selection circuit is called. If, based on a time defined by an angular momentum, the Number of character pulses is counted until a key pulse occurs, then this number enables identify the character.

. It can be seen that the most important element of the coding circuit is a counter called the main counter that counts the received pulses in binary. The binary digits emerging in series from this counter operate the write head for the magnetic tape. If the typewriter has no more than 64 characters, then the characters can be encoded using a six-digit binary code.

In the device according to the invention, two pulses are provided which precede the pulses, which represent the six codes. So you can give the magnetic tape the necessary time, without acceleration to become, d. H. assume a sufficiently constant speed. It is there necessary to reset the logic coding circuit to zero over all eight pulses. This Resetting is done with the help of an auxiliary counter. This steps in time with the one defining the characters Impulses and emits a signal with the eighth impulse, which the desired setting to zero causes.

An embodiment of the invention is shown in the drawing. In this shows
• F i g. 1 the simplified perspective illustration of part of an embodiment of the typewriter according to the invention with a block diagram of its signal circuits,

Fig. 2 a switching scheroa of the selection circuit and the coding circuit,

F i g. 3 is a diagram explaining the mode of operation of the selection circuit,

Fig. 4 is a diagram to explain the mode of operation the coding circuit and

F i g. Fig. 5 schematically shows the structure of the magnetic tape recorder.

First, the basic equipment of the typewriter will be described in broad outline (FIG. 1). An electric motor 1 continuously rotates a type wheel 10, a pulse wheel 20 with a single tooth made of magnetic material, a pulse wheel 30, the circumference of which has as many teeth made of magnetic material as the machine has buttons (for characters and functions), and the distributor finger 41 a distributor 40. The engine 1 runs z. B. at 20 rev / sec.
The pulse generator wheel 20 generates one pulse per revolution in a coil 22 wound on a magnetic core 23. In the example chosen, these rotary impulses have a frequency of 20 Hz. The impulse wheel 30 generates a number of character or function impulses in a coil 32 wound on a magnetic core 33, which are temporally evenly distributed over a cycle of rotation. Assuming that the pulse wheel has fifty teeth, forty of which are assigned to the characters and two to the functions, namely carriage return with line feed and space bar, the frequency of the character or function pulses in the given example is 1000 Hz.

A platen 2 carries a sheet of paper 3 and is by means of a conventional, not shown Roller feed shifted in the longitudinal direction.

An elastic keyboard 50 embodied in a printed circuit is connected to the distributor 40 via a connecting web 4. This distributor is a cylinder which has a ring electrode 42 and a plurality of radial electrodes 43 _t to 43 _{s0 on the inside} . The ring electrode 42 is connected to the coil 32, and each of the radial electrodes is connected to a character _{or function key 5I 1} to 5I ₅₀ . The distributor finger 41 carries at its end a metal plate 410 which, in the course of a cycle, produces a selectively capacitive coupling between the ring electrode and the radial electrode corresponding to its position.

The keys 51 are distributed on the surface of a key field 50 and are by placing a Typist's finger operated. In parallel with all buttons is an amplifier 60 as a busbar connected to the impulses emanating from the buttons. The key impulses then appear at its output on.

The angular momentum emanating from the coil 22 is applied directly to an input 10O _{1 of} the selection circuit 100 , which controls the impact of the characters on the paper. Furthermore, the angular momentum runs directly to an input 20O _{1 of} a coding circuit 200, which codes the characters entered in binary digits for labeling on magnetic tape. After all, the angular momentum is indirectly via the terminal with a certain delay! 100 “of the circuit 100 is transmitted to an input 20O _{4 of} the coding circuit 200.
The Zeicltienimpulse emanating from the coil 32

are applied directly to an input 10O _{3 of} the circuit 100 and to an input 20O _{3 of} the circuit 200 and indirectly with a certain delay and after a validity check to an input 20O _{2 of the} same circuit.

The angular momentum occurs shortly after the last character pulse of the orbit, as the pulse wheels 20 and 30 are slightly rotated against each other.

One touch of button 5I ₁ . of the keypad 50 by a finger generates a pulse which, after amplification and shaping in the amplifier 60, is transmitted as a key pulse? to input 10O _{2 of} the selection circuit 100. This key pulse is not applied directly to the coding circuit 200; it influences this circuit only through the temporal effect that it triggers in the circuit 100. This circuit supplies a pressure signal which appears at the output terminal 10O ₄ and excites the stop electromagnet 11. This magnet has a swap core that acts as a hammer and hits the touched character on the sheet of paper 3 in flight. Another control signal, which appears at the output terminal 10O ₅ , triggers the drive units which perform switching functions such as "carriage return and line switching" and "empty switching".

The encoder circuit 200 (Fig. 5) controls the magnetic tape recorder 300 with the following signals:

signals coded at terminal 20O ₅ which feed a write signal generator 301 which in turn feeds the write head 302 located in front of the magnetic tape 304 which is progressively passing through;

to terminal 20O ₇ synchronization pulses for controlling the write signal generator, which are sent at the frequency of the character pulses;

At terminal 20O ₀ pulses which, after amplification, feed the winding of an electromagnet 306 with plunger core 307, which carries a pawl 308 and with this pawl that moves back and forth acts on the teeth of a ratchet wheel 310, which gradually advances the magnetic tape and the winding via belts - And unwinding reels 314, 316 of the magnetic tape operated.

The simplified electrical diagrams of circuits 100 and 200 are shown in FIG. 2 shown.

The selection circuit 100 has three inputs. namely an input 10O ₁ for the angular momentum, an input 100 _? for the key pulses and an input 10O ₃ for the character pulses. The circuit comprises five bistable flip-flops 101, 102, 103, 111 and 112 of known design, six AND gates 104, 105, 106, 114, 116, 117, five delay lines 107.108.109, 113 and 115 and three amplifiers 110, 118 , 118 '. This assembly works as follows: If the motor 1 of the disc machine is not running, then no pulse is applied to the inputs 10O ₁ , 10O ₂ , 10O _{3 of} the circuit, and as a result the flip-flops 101, 102, 103 are at zero, and gates 104, 105, 106 are closed.

If the motor is put into operation but the keypad 50 is not used, the circuit 100 does not come into operation as long as no angular momentum is applied to the terminal 100. Since the AND gate 106 remains closed, the character pulse delivered by the coil 33 (FIG. 1) to the terminal 10O _{3 has no effect.} The same applies to the key pulse that is _{applied to the input 10O 2} , since the AND gate 105 is also closed.

As soon as the first angular impulse is applied to the terminal 10O ₁ , the flip-flop 101 changes from zero to one, and because of the interposed delay line "107 with" a certain delay T ₁ . Since the AND gate 104 constantly receives the angular momentum directly at one of its inputs and a voltage is applied to its second input with a delay τ from the flip-flop 101 when it changes to state one, the gate 104 does not initially open. However, because the flip-flop 101 remains at one, the gate 104 is opened at the second angular impulse.

The signal emerging from gate 104 sets flip-flop 102 to one, which in turn sets to first input of the AND gate 105 applies a permanent voltage.

The subsequent rotary impulses do not change the states of the flip-flops 101 and 102, and it follows from this that the gate 105 lets through a key impulse as soon as this is applied to the terminal 10O ₂ .

The capacitive effect of a finger on a key of the keypad 50 causes _{a key pulse to appear at the terminal 10O 2} , which immediately sets the flip-flop 103 to the state one because the AND gate 105 is open, and which also has a certain _{Delay T 2} generated by delay line 108 resets flip-flops 101 and 102 to zero, so that _{gates 104 and 105 close again at time T 2} after the key pulse has passed through AND gate 105.

The voltage from the flip-flop 103 transitioning from zero to one is _{applied to the first input of the AND gate 106 with a certain delay T 3} caused by the delay line 109, which then lets a character pulse through as soon as it reaches the terminal 100 , is created.

When this character pulse has passed through gate 106, it continues with that of the amplifier 110 supplied energy, the stop electromagnet 11 in action and the flip-flop 103 back to zero, whereby the gate 106 closes.

This key pulse has thus reset the circuit 100 to the initial state in which it is before using the typewriter. As long as the typist doesn't put their finger between them two successive rotary impulses from a key of the keypad 50, can accordingly the flip-flop 102 are not set to the state one, and further key pulses that are generated by leaving the finger on the same key, have no effect on the stop electromagnet 11th

But as soon as the finger leaves the key, the typewriter is unlocked and the stop is made a new character can be pressed.

It should also be noted that the electromagnet 11 also directly with the one passing through the AND gate 105 Signal could be actuated without switching on the character pulse following the key pulse. But that brings with it the danger that in terms of time

Shortened stop pulses occur when AND gate 210 is applied _{to the input 20O 1} for the following angular pulse, the straight one during the duration of a key pulse. Besides that

Effect of the finger would change considerably. he opens the AND gate 209 for the character pulses,

. The: Delay _{times T 1} , T ₂ , T _{3 of} the delay that are applied to input 20O ₃ . the

Lines 107, 108, 109 can in the order of magnitude 5 flip-flop 202 which is at zero holds the 'AND gate

a few microseconds. It is to be 212 and the zero flip-flop 203 that

Tone, - that the character display is not closed by the TA AND gate 213.

The six-digit main counter 204 counts the time.

following character impulse. It is therefore necessary to use the small pulses that pass through the AND gate 209-

Shifting the key impulses a bit. go until the validity of the key

If a function key of the keypad actuation pulse is activated at the terminal 10O _{7 of} the circuit 100, then the electromagnet 11 must not be triggered. This key pulse sets the flip-flop 201 to be. The selection circuit 100 must therefore write back to zero, whereby the AND gates 210 and ben block for all functions. This is done via 209 and the AND gate 211 is closed as an AND gate 116. Furthermore, the carriage return must be opened. The counter 204 no longer counts and runs and control the line circuit, which remains with the help as a result with the numerical equivade AND gate 117, the output of which is with the lent of the keyed character,
an amplifier 118 is connected, which supplies the energy to the input 20O ₁ , which is required to actuate the drive elements for the angular momentum brought about via the AND gate 211 and to carry out these functions. 20 sets flip-flop 202 to one, which is the AND gate

In the following it is assumed that the function 212 opens.

impulse for "carriage return and line feed" The character impulses with the period T (Fig. 4),

the last character pulse is α, which is applied _{to the input 20O 3 immediately before and}

the angular momentum t occurs (line 2 in FIG. 3). Furthermore, run through the AND gate 212, are then of

it is assumed that the function pulse »empty- 25 is counted by an auxiliary counter 205, 107, 208,

circuit «as the first character pulse b immediately The auxiliary counter 205 emits a signal that once,

occurs after the angular momentum. Taking into account- delayed by delay line 207 by 2 Γ,

gunp the fact that the triggering pulses set flip-flop 203 to one, which sets the AND

are those character impulses that open on the key gate 213, and on the other hand through the

If pulses follow, the triggering radio delay line 208 is delayed by 8 T , via the

tion pulses α and b ' in line 3 of FIG. 3. OR gate 214 is running, and counter 205 itself

The rotating and flip-flops 202 and 203 applied to the input 10O _{1 back to zero and}

impuls r simultaneously sets flip-flops 111, 112 on flip-flop 201 to one.

One. The AND gate 117 opens for the character- The gate 213 is thus closed after it

pulse a coming from the exit of gate 106. 35 let six character impulses pass, which act as syn-

The character pulse d continues after a chronizing pulse via the output terminal 20O ₇

Delay line 113 is sent to the recording device 300 for a defined time.

Flop 111 to zero, whereby the gate 117 is again These six impulses are with C ₃ , C ₄ ... C _s (line

is closed. In addition, the from shift (b), F i g. 4).

th of the flip-flop 111 generated signal after a 40 The counter 204 can operate as a shift register.

Delay in a delay line 115 to it, He will be in the intervals between these six

to open the AND gate 114, which is used for the Zei synchronizing signals via the delay line

chenimpuls b 'becomes permeable, which in turn pushed the 206 five times in a row. At the exit

Flip-flop 112 resets to zero, which means that an opening of 200 _s of counter 204 occurs.

of gate 116 results. 45 following binary digits, which correspond to the six digit

It can be seen that the symbol impulses correspond to the weighting of the symbol equivalent and

stronger 110 and the terminal 10O ₄ run while the to be written on the magnetic tape is encoded

the function impulse for »display carriage return and line characters. These are six binary digits

circuit ”is sent via the amplifier 118 and the terminal to the write signal generator 301 (Fig. 5).

10O _{5 is} running, and the function impulse "empty circuit", 50 It should be noted that output 200, des

the six-digit counter 204 for both the characters and the function with the one output of the

"Space bar" occurs, connected via amplifier 118 'and sixth flip-flops (digit weight 6).

the terminal 10O ₅ '. The six synchronization pulses C ₃ to C ₈ thus control

The operation of the logical generation of the six write signals in dependent coding circuit 200 is described below. 55 validity of the respective state of this sixth flip-The terminal 20O ₁ receives the rotary impulses, the flops.

Terminal 20O ₃ the character pulses, terminal 20O ₄ If you take a "long" pulse for the

the second angular momentum and the terminal 20O ₂ the was one of this flip-flop and a "short"

tested key impulse. Impulse for the state zero, then run one after the other

The first angular momentum has no effect on the 60 other operations:
logic circuits of the circuits 100 and 200. The

second angular impulse, which with a certain delay the impulse C ₅ controls the first from the counter

tion at the terminal 10O _{6 of} the selection circuit 204 delivered write pulse with the digit

100 appears, an input of an OR weight becomes six, since it is the sixth digit of the counter

Tores 214 applied, whereby the flip-flop 201 65 has not yet changed its state;

to one, the flip-flops 202, 203 and the counter of the delayed by the line 206 pulse C ₃

205 can be set to zero. shifts the counter 204 by one digit, and

The flip-flop 201 set to one opens the therefore the sixth position assumes the state

^ 7

ίο

which is communicated to her through the fifth digit; the pulse C ₄ controls the second write pulse supplied by the counter 204 , which corresponds to the digit weight five;

the pulse C ₁ delayed by the line 206 shifts the counter 204 by one digit, and consequently the sixth digit takes on the state of the fourth digit, and so on.

One possible way of representing the characters to be written on tape is in line (h) of FIG. 4th specified. Each cycle time T = Ims is divided into three Times 773 = 0.33 ms. The binary digit one corresponds to a write current with a duration of 2 773 and the Binary digit zero corresponds to a write current with a duration of 773.

The step feed controlled by the signals appearing at the output of the flip-flop 202 runs ahead of the write signals by 2 ms. B. can be between 10 and 20 cm / s.

Finally, in the example chosen, it is possible to use fifty print characters per revolution and six Code digits to decrease the mechanical speeds and frequencies of the write signals. This can e.g. B. be effected by the following arrangement:

In the light coming from the terminal 20O ₃ line of the AND gate 209 and the input can be the gate, and 212 a by four dividing frequency divider 215 (shown in phantom g in F i. 2) between the input to be inserted, by the angular momentum Zero is reset. As a result, the AND gates 212, 213 are actuated with a follow-up time of 4 ms instead of 1 ms, and the writing speed on the magnetic tape is slowed down accordingly.

The throughput times of the magnetic tape [line (g) in FIG. 4] amount to then

4 (2+ 6+ 2) = 40 ms,

and the belt speed drops to a quarter and is in the range of 2.5 to 5 cm / s.

In this case, the clock times for dividing the signal writing duration into three times T / 3 can be supplied by the voltage divider 215 dividing by four, the third digit being lengthened to two lines.

In addition, a seventh pulse can be added to the coding in a known manner, which is added to the Parity of previous pulses is tied. In this way you can read the magnetic tape by control a parity check can be performed.

F i g. 5 shows, in schematic and conventional form, the structure of a magnetic tape recorder 300 connected to the typewriter.

The write signal generator 301 feeds the read head 302, which presses the magnetic tape 304 lightly against a felt strip 303. As stated above, the write signals from the main counter 204 are applied to the terminal _{30O 1} connected to the output 200 _{s of} the coding circuit 200 and the terminal 300 _s connected to the output 20O _{7 is} the output from the auxiliary counter 205 (FIG. 2). outgoing synchronization pulses.

A power amplifier 305 is fed by the pulses emanating from the flip-flop 202. As already mentioned, the power amplifier excites the winding of the electromagnet 306 with plunger core 307, which carries the pawl 308 which is arranged pivotably and held under tension by a spring 309.

When the plunger core is attracted by the electromagnet, the pawl acts on a tooth of the gearwheel 310. This gearwheel is set in rotation until the tooth that is gripped is released from the pawl. After this switching step, the gear wheel is locked by a roller 311 which engages between two teeth under the action of a spring 312. The plunger returns to its original position and the pawl engages the next tooth.

The drive roller 322, against which the magnetic tape 304 is pressed by a rubber roller 323 , and a belt pulley 324 with two grooves are seated on the shaft carrying the gear 310. The pawl 308 thus pushes the magnetic tape 304 over the wheel 310 and effects the unwinding of this tape on the take-up reel 314 via a belt 313 , the belt 313 being able to slide more or less depending on the filling of the reel 314. In this way, the passage of the magnetic tape caused by the intermittent advance of the tape can also be absorbed. The tension of the magnetic tape placed on the supply reel is maintained by the cross belt 315 .

In addition, the magnetic tape between the rollers 317 and 319 is deflected into a slight loop with the aid of a roller 318 pressed by a spring 320 , which has the following purpose: With each relatively sudden advance of the magnetic tape, the length advanced by the drive roller 322 is from that between the Rollers 317, 318, 319 removed from deflected pieces, which causes very low inertial forces. After each step feed, the loop between these rollers is formed again, whereby the supply reel 316 is given a relatively dampened rotational movement.

Later, the information written on the cassette magnetic tape can be continuously updated with large Speed from a computer or a corresponding device, for example in real-time operation, to be read.

For this purpose 4 sheets of drawings

Claims (1)

Claim: • Magnetic tape labeling device on a ^ key-operated typewriter with continuously revolving type carrier, with a rotary pulse generator connected to the type carrier in a rotationally fixed manner, which supplies one rotary pulse per revolution, ^and i Circularly distributed character pulses, whereby a key pulse is generated by depressing one of the keys and wherein the character corresponding to the depressed key is determined by the number of those character pulses that are generated between an angular pulse and the subsequent key pulse, characterized in that a binary main counter (204) is provided for the character pulses occurring between an angular pulse and a key pulse, which can be switched on by means of a triggering device (201, 209) controllable by a rotary pulse and switched off by means of a stopping device (201) controllable by a subsequent key pulse a blocking device (107, 101, 104) is provided for the angular pulse following the key pulse which has actuated the stopping device (210) so that this subsequent angular pulse has no influence on the main counter; an auxiliary counting device (205, 207 , 308) for selecting a predetermined number of character pulses after the rotary pulse following the key pulse that has occurred, that these selected character pulses serve as synchronizing pulses for the step-by-step advancement of the magnetic tape (304) of the magnetic tape storage device (300) and that after a fixed number of pulses at the beginning of this series of selected character pulses, the number of remaining character pulses corresponding to the number of code elements of a code character to be recorded can be supplied to the selected sequence of a control device (206) for triggering a reading process of the main counter (204) operating as a shift register when reading out d that the binary digit values which are stored in the main counter and which represent the typed characters can be fed one after the other to a magnetic head control stage (301) of the magnetic tape storage device (300) . 55 , ·> The invention relates to a magnetic tape labeling " control device on a key-operated typewriter with a continuously rotating type carrier, with a rotary pulse encoder connected to the type carrier in a non-rotatable manner, which generates a rotary pulse per revolution supplies, and with a character pulse generator, the character pulses evenly distributed over a cycle outputs, whereby a key pulse is generated by pressing one of the keys and wherein the character corresponding to the pressed key by the number of those character pulses that are generated between an angular impulse and the subsequent key impulse. The encoded on the magnetic tape, which is preferably contained in a small cassette of known type. written Characters are simultaneously struck by the typewriter in plain text, as they are in the DT-OS 19 20 470 is described. In the known device, angular impulses, i.e. circular impulses, character impulses and Key pulses, fed to a program-controlled data processing system, from which the output of the data is also possible on a magnetic tape, whereby the output and the storage process runs in detail under the control of the program of the data processing system. The basic possibility of storing data on a magnetic tape, a special device-related one However, implementation is not described in more detail. In addition, it proves to be disadvantageous that for Saving in principle computing time from the central Arithmetic unit is required. Building on this prior art, the invention is based on the object of a magnetic tape labeling device on a key-operated typewriter of the type mentioned above, through which a direct, character-wise, serial Saving of characters in a magnetic tape is made possible, which is on the keyboard of the typewriter entered. To solve this problem, the invention provides that a binary main counter for the between an angular pulse and a key pulse is provided character pulses that occur by means of a triggering device controllable by an angular pulse can be switched on and by means of a by a subsequent key pulse controllable stopping device can be switched off, that still a locking device t'for the angular momentum following that key pulse is present which the stopping device has operated so that this following angular momentum has no influence on the main counter, that further an auxiliary counter for selecting a predetermined number of character pulses after the angular impulse following the key impulse is present that these selected character pulses as synchronizing pulses for the step-by-step advancement of the Magnetic tape of the magnetic tape storage device and that after a specified number of Pulses at the beginning of this series of selected character pulses represent the number of code elements of a code character to be recorded corresponding number of the remaining character pulses of the selected Sequence of a control device for triggering a reading process when reading out as a shift register working main counter can be supplied and that the characters stored in the main counter are keyed in representing binary place values one after the other of a magnetic head control stage of the magnetic tape storage device are supplied. The device according to the invention differs from another known device, such as them in IBM Techn. Disc. Bull., Vol. 7, 1964, p. 468, in their structure and in their mode of operation basically: In this known device, the is selected using a keyboard Characters entered in a register in coded form. A comparator serves as a decoding device in order to