JPS5878780A - Recording head - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates generally to an apparatus IK for providing a visible and corresponding magnetically encoded arrangement of data, and more particularly to an apparatus IK for providing a visible and corresponding magnetically encoded arrangement of recorded data. This relates to devices that are stored in a single medium in which there is a fixed positional relationship between both modes and magnetic modes.

Conventional devices of this type typically utilize permanent magnets sprinkled on the type bar of a typewriter.
The permanent magnet is placed within or below the printed type. In these devices, the magnetic data is recorded together with the visible data printed on an opaque paper sheet that has an aerosol coating or is impregnated with magnetic material. When a certain key of the typewriter is struck by the operator's finger, the permanent magnet is brought into contact with or in close proximity to the magnetic part of the sheet, causing the amKa*t- of the sheet to be printed. . Due to the thickness and magnetic properties of the paper, it is not possible to effectively record the material through the paper sheet and onto the target aircraft using a permanent magnet that strikes the sheet from the side or front of the paper. Magnetic through the sheet 4
In the conventional arrangement in which magnetic data is recorded by the magnetic data transmitted through the 18th layer, the K is not sufficient to detect the magnetic data without error. Although no error will occur when recording on a sheet of paper impregnated with magnetic material such as decorative magnetic particles, this sheet of paper generally has a dark tint and colorless particles of koji-sized colorless particles on it. However, it became difficult to separate the visually recorded data.
Of course, it is not possible to erase printed data from a fish that has been soaked with magnetic material.

This is because when the magnetic surface V is erased, a sharp shadow appears on the appearance of the printed data on the sheet, causing irregularities. Such an irregularity makes it difficult to correctly detect the vIa bundle during ribbon return.

One disadvantage of a device of the type in which the permanent 6 stones are carried by the type bar 11 DK cannot be provided without providing a special type bar 1 for spaces, tabs or carriage returns or cords for the typewriter. That's what it means.

If a tab or carriage 9-1 code is not introduced onto the magnetic medium, the time required to read information 1 from the magnetic &:# will be significantly longer than the time required to record the t* information. . If the recording medium is not provided with a space code, it is essential that the medium carries a suitable type of timing or timing trunk. In this case, the recorded data cannot be considered self-clocking or self-synchronizing.

Another disadvantage of devices using permanent magnets in the type bar is that the magnetic flux level is reduced as the platen is mechanically tapped.

Eventually, the magnetic flux level of the magnet is reduced so much that not enough magnetic flux is recorded on the magnetic string to allow positive generation of data during readout. The magnets can be remagnetized by the use of specialized equipment, but such remagnetization operations are expensive and time consuming.Furthermore, an operator is required to Usually not known.

In some conventional devices, the permanent six stones are carried within the letter head itself. Kowara's device has the above-mentioned disadvantages 1-5, and the structure of the character head is mechanically punctured, so even if it is not used much, the head is
There are also some disadvantages (2). Another disadvantage of the type of VK in which the magnet is attached to the head is that small characters such as commas and periods cannot be carried by the magnet. This is because the character head does not have enough tI surface maple for one or more σ] magnets.Therefore, the period , the permanent magnet has its letter k
If you become a KjjM person, you will become something that cannot be separated from you.

Devices in which permanent magnets are mounted below the printhead have additional problems. Generally 1 in such devices only uppercase type may be used. This is because lowercase letters are usually assigned one magnetic structure.

Some devices that have been proposed have uppercase and lowercase letters with two hexagons extending below the letters, but these devices are impractical. This is because different Tie 1 lighters have different sized platens Y, and the platen has a corresponding period 1'
&, This is because after using it for 1K, it often loses its shape. Even devices where lowercase letters and magnets are replaced have problems with platen size and teardrop shapes. This is because the magnet and the capital letters must strike the rounded portion of the platen inwardly at the same time.

Ka below the printed characters! One problem with devices with stones is that magnetically recorded data is not correctly written onto the magnetic medium at the tts of the page. As is well known, typists often do not realize that they are typing the last line of a sheet of paper or below the point where the beast remains horizontally enriched.

The magnetically recorded data below that line becomes difficult to detect accurately. In these devices, there is a possibility that erroneous magnetic pins cannot be completely erased.

Another type of prior art device generates electrical signals in response to actuation of each key on a typewriter keyboard. A different code represents each key. In response to the electrical signals, different areas or spots on the magnetic recording member are created to cover the area required for one character. are the horizontal and vertical matrix positions f/II of the count with equal total area
It is magnetized at i.

To express each character in a mountain-like manner, the horizontal flat material of the number -2>E
& , II, a single head cannot read all of the data associated with a particular character. Moreover, because the shears of ai spots placed on each letter are different and the positions of those spots are different, the borders formed by these devices are not self-timed and therefore fEiJ calculations are different. There must be a standardization track.

In addition to the above-mentioned I'&lI combinations, this device lacks complete keyboard encoding, such as spacing, carriage returns, shifting between upper and lower case letters, and excluding the letters Ail.

The above-mentioned drawbacks of conventional devices can be eliminated by the system of the present invention! lc will be arrested. The apparatus of the present invention utilizes a single flexible recording medium for recording in visually readable and magnetic modes. More specifically, the medium is formed from a paper sheet of a suitable color, such as white, with a surface portion covered with a thin film or strip.

In response to each key actuation of the coded typewriter, a bipolar magnetic data bit is applied to the surface area of the magnetic film. The magnetic data represented by each character is applied to the magnetic film using a coreless magnetic recording head formed from a single conductor. Each conductor is selectively energized by a selected and pressed key ILK according to a certain code representing the selected key IL. ) is written for each character. Contains shift key and parity bit. From that, the same number of bits are added to the magnetic record, which is OI bipolar data, where both letters and lowercase letters are arranged and read out and self-clocked. Check the placement. Sequential addition to this data record yields a single track of data representing sequential character and function key selections and operations; therefore, the record is completely self-timed and has no synchronized track. is not required.

The tfllr' recording head has a tie fiber in edge contact with the sheet of the platen, preferably one conductor of the recording head, so that optimum magnetic flux linkage is achieved between the conductor of the head and the magnetic recording element. The surface of the magnetized film KI
It is placed above and behind the body so that it makes N-contact. By placing the recording head above the point where the type bar makes contact with the bottom of the page. This eliminates the problem of overflow of data recorded on the sheet.The problem of overflow at the top of the sheet does not occur. This is because sufficient spacing or headings are provided at the top of each page.

The following margin: A magnetic recording head constructed according to the present invention can be used as a magnetic F-bell medium! It is provided with a number of conductors arranged so as to touch each other and having a very small cross-sectional area.

In a typical recording head, 36 conductors are provided. In this case, eight of those conductors have a magnetic flux f
& media, and the other remaining conductors act as spacers between the flux supply conductors. In one embodiment,
The conductors are comprised of a plurality of single turns of wire; in another embodiment, the conductors are in the form of very thin strips.

In both of these embodiments, some of the conductors have longitudinal axes that are offset parallel to each other. These conductors are arranged in phase space so that the magnetic flux recorded by them K never exceeds the space required for the largest character typed by an unbalanced typewriter.

In order that sufficient bipolar magnetic flux can be imparted to the magnetic medium by the conductors, the conductors are energized with a current having a very large peak amplitude of sufficiently short duration so that the conductors are not damaged. . It has been found that a current pulse having a peak M of about 20 amps and a duration of 30 microseconds provides sufficient magnetic flux to the recording medium to obtain accurate results. The circuitry used to generate these pulses essentially comprises switches such as silicon controlled rectifiers and capacitors. The charge stored in the capacitor is discharged through the silicon controlled rectifier when the gate electrode of the rectifier is energized.

It is an object of the present invention to provide a new magnetic recording head with static recording and erasing capabilities and a bit density of about 160 bits per inch. The present invention will be described in more detail with reference to embodiments of the present invention.

VISUAL AND MAGNETIC RECORDING MEDIA Before describing the apparatus of the present invention in detail, reference is made to Figure 1 for representative examples of data recorded by the apparatus of the present invention. In these figures, Fe, O,
Or i? e, 0. A conventional bond paper sheet 21, approximately 2-3 mils thick, is shown having a flexible spread sheet covering film or layer 22 of a highly magnetized material such as. The coating layer 2
2, magnetic data bits are recorded and stored 5. Covering layer 22 typically has a thickness of about 0.5 mm. It is applied to the entire surface of one side of the bond paper sheet 21 by a conventional method.

As shown in 1-5, essentially the same corner area requires a conventional type-printed alphanumeric or bond paper sheet! It is printed on l. Typical ordinary typewriter
The number of characters is 10 inches, and the spacing between each line is approximately 0.1.
It is designed to be S inch. Based on this representative example, each position assigned to and occupied by an alphanumeric character is about 100 mils wide and about 16 mils high.
It is 0 mil. Complete 50-key typewriter - Uppercase and lowercase letters from the keyboard are printed on bond paper sheet 21, single-spaced if necessary.

Successive characters on the same line are printed one after the other on the sheet 21, as in printing by an ordinary typewriter.

As can be seen from No. 11d, in direct alignment with each alphanumeric character printed on sheet 21, bipolar magnetic data is suitably encoded to represent any single key on that typewriter keyboard. There are specific combinations of eight bits. The data bits are depicted as four short straight lines forming a single track of magnetic bits on the 44111 layer 22. Certain representative combinations of eight bits are illustrated in FIG. The area that occupies those eight bits is approximately the same width as one typewritten character.

Similarly, since these eight bits are the binary coded representation of one % character, the height of each of those one bits is approximately the same as the height of that character. Each group of eight bits responds to a corresponding key actuation [and is recorded simultaneously (or in-situ) in the magnetic overlayer 22 at a position slightly above its corresponding key print indicia] to generate a character. A predetermined constant or l-to-l positional relationship is provided between the rows and the corresponding multi-bit magnetic data tracks consisting of a series of 8-bit groups.

Therefore, in the word rHgADINGJK in Figure 1, the letters jAJ are typeprinted in the line just below the position where the corresponding representative magnetic bit is recorded, but in the width direction of the sheet. The relative positions of the recorded visual and magnetic data along are aligned.

Therefore, the horizontal rows of alphanumeric data are offset from and parallel to the rows of a single track of magnetic data on the magnetized side of the recording medium by a certain distance.

Each alphanumeric character also evokes its specific character5! ! ! in some defined perpendicular relationship (typically aligned) with each group of eight specifically encoded magnetic bits.

The first six magnetic bits of the spike loop indicate which key on the typewriter keyboard was pressed; the seventh bit indicates whether the shift lever was pressed while the character was being recorded (uppercase or lowercase). ).

The last bit, ie, 1*, is used as a parity bit for error checking.

The parity check used is such that some odd number of rlJ and [01 bits are induced for each character. To illustrate, for the lowercase letter raJ, the first six bits are 101001 and the seventh bit is
The ``l'' bit indicates that the shift lever was not actuated, and the eighth bit is also the r31 bit, which provides the desired parity check. For the capital letter rA, the first 6 bits are the same as ``1'', i.e. tot
Although it is oot? The 4Ith bit is recorded as a ``0'' bit indicating that the shift key was activated on the keyboard, and the last bit is recorded as a ``0'' bit giving the required odd parity check. .

Eight magnetic bits for each key are simultaneously formed in the magnetic coating layer 22 by applying a corresponding number of rapidly changing currents to the magnetic coating layer 220 assigned areas.

Each magnetic bit thus formed has a north and south pole laterally separated from each other by a relatively small distance, and the orientation of each pole along the width of the paper is determined by its recorded Shows the character code.

The centers of each magnetic bit are separated by a sufficient distance to provide sufficient separation between adjacent magnetized regions to obtain a voltage waveform that is well defined to meet the readback requirements of that particular device. bit away from the center. A single track of magnetic bit groups is formed in the 6m layer 22 of the magnetic sheath 22, corresponding in position to the letter space of the sheet 21. As a result, a self-synchronized serial device can be used to read the magnetic record.

FIGS. 4 to 7 show an embodiment of the recording apparatus of the present invention for simultaneously writing recording and magnetic recording by a human being in the sheet 21 and the magnetic coating layer 22, respectively. has been done. Referring to FIG. 4, this device operates by pressing the backspace key 27. Special erase key 28 for erasing magnetic data. Space par 29. An ordinary electric tie with a total 50 key keyboard with uppercase and lowercase letters along with a carriage return key 30 and a shift key 31.

Equipped with a printer.

Erase - + - 28, space par 29. The carriage return key 30 and the shift 4-31 have a permanent magnet 32 fixed to the downward extending portion thereof. Each of these magnets may be moved past its associated reed switch 35 when its associated key or key is pressed. The reed contacts of each switch close in response to passage of the magnet.

The electrical signal generated when the reed switch closes is activated by the erase key 28. Space par 29. It shows which of the carriage return key 30 or shift key 31 was pressed by the typist.

In addition to the special signals induced in response to the depression of keys 28, 30 and 31 and bar 29, signals are likewise generated when any of the other keys on the typewriter keyboard are pressed.

In addition to these signals, the erase key 28 and shift) +-3
All signals generated in response to depressing one of the other keyboard keys are fed via a multi-lead cable 37 to a diode-encoded matrix indicated generally by the reference numeral 36.

Electrical signals supplied to the IJ are obtained by closing each switch. As mentioned above, the states of these switches are under the control of magnets associated with each key on the keyboard. If there are 50 other keys in total, there are 50 additional switches and 50 additional connection leads.

Matrix 36 indicates that if actuation of a selected key on the keyboard closes the associated switch and connects one of the 50 leads to ground, eight predetermined binary electrical signals will be output to that matrix. It is constructed so that it is generated simultaneously on eight fat bodies coming out of the cous. first 6
The second bit indicates which key on the keyboard was pressed, the seventh bit indicates whether the shift key 31 was pressed, and the 84th bit is used as a security check. There is. Special codes are associated with the space pars 29 and carriage returns 30, such that the binary bit combinations for these middle keys differ from those of the other keys, but are such that they maintain a no(ity check).

To maintain parity check for uppercase letters,
The diode encoding matrix 36 is connected to the shift key 31
means for generating an "O" bit as the 1% bit if activated, and means for inverting the parity check for each character in response to activation of -31 during shift. Eight predetermined signals obtained from the outputs of the diode encoding matrix 36 are applied to a recording circuit 39. High amplitude current pulses generated in recording circuit 311 open normally closed relay contacts in switching circuit 38 to recording head 41, which is fixed above platen 42 in typically horizontal alignment with type guide 43. Added.

Referring to FIG. 11!1, Nos. 5-6, the magnetic recording head 41 is fixed to an arm 45 having an enlarged inner end fixed to a hollow shaft 47. As shown in FIG. The hollow shaft 47 is integrally attached to the frame of the typewriter. The head 41 is the type guide 4
3 and are typically arranged vertically at the center K1m of the frame of the typewriter. Arm 46 and spatula +4
The shaft 47, which carries 1tt, typically carries the medium 21
．． In order to record magnetic characters on either part of the platen 22, the length is approximately three times the length of the platen 42. The signal from switch 3B is sent to cable 48
A hole 46A is sheathed with a cylindrical shape and inserted into the shaft 47 and extends across the arm 46 and a portion of the shaft 47.
The head 41 is supplied by a conductor passing through the shaft and exiting from inside the arm. Each of the conductors forming cable 4B is connected to a collar-type multi-terminal connector plug 6.
00 connected to one terminal bin. The multi-terminal connector plug 60 is manually inserted into the connector receptacle 59 of the head 41, as illustrated in FIGS. 1 and 5.

Magnetic Recording - Details of Recording Head In general @6 Referring to Figure, one head 41 is a coreless magnetic head with three sections A, B and C! Price 5. Each of these sections is equal in width, typically xoo mil, and each section serves a different function determined by some selected mode of typewriter operation. The first section is formed by a single continuous conductor with two end leads 49A and 49B, typically having 52 turns, which are keyed. Erase the characters recorded in (delete dl)
K) is activated when required. During one erasing mode, in section B between sections A and C, certain magnetized regions of the magnetic coating layer 22 are erased while recording thereon, thus making the recording accuracy and integrity higher. . To do this, both 4W of recording sector *yB'
6 or the marginal area of section B' and C.
is extinguished by suitably energizing a spaced winding separate from each of the. Similarly, during its erase mode, the sectioner erases the marking area and the marginal area of previously recorded characters. By demagnetizing the marginal region,
The possibility that previously recorded and unerased magnetic bits will remain on a sheet 21 that is reinserted into the typewriter with a slight offset is reduced. In section C adjacent to section BKII, a certain preceding character
In the darkness recorded in ', certain areas are similarly erased.

Section C is formed by a number of turns formed by a single continuous conductor having lead ends 51A and stB.

Typically, each conductor has a conductor of 0. It is made of 1.75 mil diameter copper wire coated with a 1 mil thick electrically insulating layer of polyurethane. Each conductor is connected to the head frame 41
' is wound uniformly around a mandrel-shaped portion 52 such that the elongated section of each turn is in direct contact with the magnetic coating layer 22. Since each section of the conductor is coated with an insulating layer, short circuits between four adjacent bodies are prevented. Portions of the recording head other than the conductor wrapped around section 52 are preferably formed of a suitable insulating material such as a polymer or epoxy resin.

When each magnetic bit is recorded on the magnetic overlayer 22, only every fifth turn of section B' (see FIG. 6) is energized; the remaining turns for that bit are placed between the energized turns. Used as a spacer.

Eight single conductors are interposed in certain juxtaposed and spaced turns of the continuous winding of mandrel 52. Each such recording conductor forms a turn or less than a complete turn on the mandrel, and typically has a length that covers the top, bottom, and -faces of the mandrel, as shown in Figure @6. Appropriately labeled. Also, each sickle conductor is separated by four spaced turns that are simply spacers and are not supplied with signals. In Figure 6, reference number 4
53-1 and 5B-2 are the IMl and second characters of a certain character.
The recording volume (b) for the bit of is shown, and the subbey range is indicated by the reference numeral s4.

The seventh and eighth recording turns are designated by reference numbers 53-7 and 53-8, respectively. Of course, the dimensions shown in Figure 6 are extremely KIII-corrupted, with record number 153-1 for the first bit of a character and the last bit (eighth bit) of that character. record winding 5
The total lateral distance between 3-8 is typically on the order of 68 mils. Volume 1 for recording bits of 1st and kg2
In the method described above for spacing pils 3-1 and 53-2, four spacer conductors precisely separate each of the other six recording turns 53-3...53-8 from each other. used to maintain the condition. Thus, section B is defined by turns connected to leads 49A and 498, and section B is defined by leads 50A and 5oB6cW! section C is defined by lead 51A and 518Km connected turns; lead 49i3, 5OA and soB
, stA are commonly connected by a single terminal.

As described above, the leads 49B, 50A and 50B, 51A are one continuous iI! ! - I have been the president since
Recording lead group 53-IA, 53-IB,...53
-11A, 53-sB are the corresponding recording turns 53-1°...53- which are less than a complete l turn.
No magnetic core material is used in the head 41;
Additionally, turns with 4e edges are used as spacers between IIHI recording turns. Sufficient magnetic flux, Vol.-5
3-1, 5S-2...53-8 are applied with i & intensity current pulses, and the windings are brought into contact with the magnetic coating layer 22.
By making it 5, those volumes 1!1! It is applied to the magnetic coating layer 22 by IK.

As explained below, a current flow having a peak value of about 20 amperes S for about io microseconds (loose winding 53)
A circuit is provided for adding to -1, 5 N--, -53-8. Such current causes the magnetic layer 22 to
Sufficient magnetic flux is generated around these turns to suitably change the magnetic state of a given area. Even at very high and wide grits, the duration of their pulses is so short that the conductors will not get overheated to the point of damage. It may be modified such that a winding is used to record each bit. In such a configuration, the direction of current flowing through the first of those two turns is opposite to the direction of current flowing through the second winding for the same bit, and that @1 When the winding is 1 and the specific bit is z4rt, it is switched to the current source @1, and the second winding 1g1G1 .
．． When the binary rOJ is to be recorded, a switch is made to the second current forest. As in the case of the embodiment shown in FIG. 6, the recording turns for each bit correspond to each magnetic i! Each of the areas is separated by fourteen spacer turns to give the desired edge spacing. FIG. 7 shows another embodiment of the placement head. In this recording head 41, the magnetic layer 22 and the head 4
Contact 4' with surface 58' of 1! , ill-like @J@2
It is maintained by a plurality of apertures 89 perpendicular to the surface of the head contacting the head.

Aperture 89 communicates with a common hole 9° formed in head 41 during its fabrication and connected to a suitable source of fluid pressure, such as a vacuum pump (not shown). The pump applies a subatmospheric pressure of about 13 bonds per square inch to the magnetic 1141 layer 22 through the apertures 89. This vacuum winds the recording medium 53-1...
- Sufficient to hold - while remaining firmly in contact with 53-8. This is controlled by a solenoid valve 9l-1 (see FIG. 1) provided in the pipe 91. Moreover, the pressure applied through the pipe 91, which is equal to or higher than atmospheric pressure, is 'f
It may be controlled by an in-line solenoid pulp provided at 191.

According to yet another embodiment of the present invention, erasing and recording-1
The plate axes of 1- are mutually orthogonal, ie arranged at right angles to each other. In such a case, in erasure 4 -
are erased before recording or in response to pressing the backspace key, and are placed at the position of each Confucian one-character sentence in the middle section B of FIG. Therefore, these two elimination turns are shown in section Man and C in Figure 6.
The windings are arranged perpendicularly to the windings respectively drawn in .

According to another embodiment of the invention, the recording conductors and the erasing conductors are all arranged one character apart, parallel to each other and with their respective longitudinal axes aligned. The two erasure and record windings are therefore arranged perpendicular to the lanes shown in sections A, B and C of FIG.

In yet another embodiment, the recording conductors are arranged perpendicular to the erasing conductors and separated by one character from each other. Therefore, the recording turns are orthogonal to the recording turns shown in section /B of FIG.

The winding of the head 41 has a dimension of X! The dimension Y in the direction perpendicular to the surface of the magnetic covering layer 220 is set to a ratio such that approximately the same current density is given to the corresponding wire conductor 61.

All other factors being equal, the wear life of the recording winding is increased because considerably more metal is available in the strip-shaped winding IIK. A set of spacer strips 95-1, 95-2 corresponding to two of the spacer turns 54 in section B of FIG. 6 of the recording head is illustrated before being connected.

The strip 96 corresponds to the recording turns 53-1...5 in FIG.
Records corresponding to one of 3-8) This is an IJ tube.

Reference numeral 97 designates the strip corresponding to the first turn of the head to which lead 49A is joined in FIG. Strips 98-1 and 98-N represent typical erase strips in a section of the recording head.

01ko='@ indicates the series connection of the terminal strip 97 and the juxtaposed erase strip 98-1 and the series connection between the various spacer strips 95 and between these spacers 95 and the adjacent strips 98-N. strip 98
-1 is electrically connected via lead 49 to strip 97 which receives the erase current pulse. The walls and sides of the various strips may be coated with a layer of a suitable electrically insulating material to prevent short circuits between them. The material may be a suitable epoxy compound which is deposited on all surfaces of the strips except for the leading edge of each strip web which contacts the 22 kg magnetic coating layer.

To interpose recording strip 96 between two other strips, such as strips 95-1 and 98-N, the two parallel legs of each strip are bent in opposite directions from the plane of the strip ( (See Figure 2) Strip 96
It is made to pass between the branch arms of. after that,
A physical and electrical connection is made between each downwardly and upwardly extending end portion of strips 95-1 and 98-N. Similarly, connections are made between all juxtaposed strips except for those used for recording, such as strip 96.

Magnetic Recording - Detailed Arrangement of Typewriter Mechanism Windings 53-1, 53-2...53-8 are in effective contact with the magnetic surface of the magnetic heating layer 22 in FIG. For pressing, the head 41 is positioned just above the platen 42 and contoured along its lower surface to closely match the cylindrical portion of the platen 420 just above the point at which the type bar 25 strikes the sheet 21. There is.

In order to maintain contact between the magnetic wave s22 and the conductors 53-1...53-8, the platen 61 is connected to the platen 42.
sprinkled on the carriage assembly 50 substantially immediately above the
It has a longitudinal axis extending parallel to the longitudinal axis of the lower platen. The platens 42 and 61 are connected to a pin hole 63 located a distance inside the edge of the sheet to positively feed the sheet and maintain the sheet in horizontal alignment. It carries a radially projecting pin 62 for mating.

Referring to FIGS. 4 and 5, the magnetic covering layer 22 is connected to conductors 53-1...53- by transparent hold-down plates 64 spanning between opposing columns of bins 620.
8 can be firmly contacted. Carriage assembly 50
A pin 65 fixed to the plate 64 is hinged to the upper right end of the plate 64 so as to be able to pivot, as shown in FIG. The lower left end of the plate 64 has a pin 66 that selectively engages a hole (not shown) in an abutment member 67 secured to the carriage assembly 50. The hold down plate 64 is a magnetic layer 22.
In order to make good electrical contact with the conductors 53-1, . . . , 53-8 of the head 41, the cross-sectional width of the lower end thereof is enlarged.

Despite the trap of rubbing between the surface of the sheet 210 and the surface of the magnetically covered layer 22, the clamping action of the elongated spring clips 68 maintains proper alignment. A clip 68 is connected at each end of the plate 64 such that when the pins rotate, a longitudinal slot 69 formed in the clip 68 connects the pin 6 of the platen 61.
The second uke is allowed. As shown in Figure 11g5, the end of the clip 68 far from the hinge pin 65 is
The platen 640 is connected to the platen 64 and is formed to extend parallel to the semicircular upper portion of the platen 640 so that the platen 64 can be freely ejected from under the platen 61. Platens 42 and 61 are rotated together and synchronously by belt drive 70 to ensure that pin 62 engages and drives sheet 21 and magnetic layer 22.

Magnetic Recording - General Description of Recording Operation A magnetic bit is recorded on one magnetically assisted layer 22 at the same time as a corresponding character is printed onto the sheet 21. A typical recording would be for the operator to press some selected letter key on a keyboard such as that shown in FIG. It is started by being made K.

When its corresponding switch closes, ground potential is applied to the conductors connected to one of the switches and which are among the conductors bundled into cable 37. In response to grounding this particular conductor, the diode coding matrix 3
6 generates eight two-way signals in parallel on its eight output conductors. These eight signals are applied to the recording circuit 39 through the switches 38 and to the conductors 53-1...53-8 as shown in FIG.

Each of the conductors 53-1...53-8 is connected to a block 59.
via its associated leads and terminal connections to
The binary "l" signal, which receives a different predetermined unique two-pass signal, flows in one direction through the conductors, resulting in a binary "0" signal.
” Signals flow in opposite directions through these conductors.

The binary "l" and "0" currents flowing in the conductors 53-1...53-8 generate magnetic flux in opposite directions depending on the polarity of its VLk applied to each lead and turn. . In response to the clockwise and counterclockwise magnetic fluxes cast from the conductors 53-1 and 53-2, the surface area of the magnetically covered layer 22 that is in direct contact with these conductors is the representative of the magnetically covered layer 220. The targets ζ are magnetized in opposite directions across a width of 3 mils.

If adjacent conductors 53-1 and 53-2 are sufficiently separated from each other, for example by 10 mils, then the center of magnetic flux concentration caused by the current passing through these conductors will also be tir-xo.
Only the mill is separated. The edge effect of magnetic flux extends approximately 15 mils to each of the centers of the turns, so there is approximately a 7 mil gap between adjacent magnetic flux regions of the magnetic layer 22. The 7 mil spacing between the opposite edges of the magnetic bits recorded in the magnetic ridge layer 22 is equal to the distance between adjacent recording turns 53-1 and 53-.
provided by four spaced turns 54 inserted between the two. Because of the spacing between adjacent recorded bits, the magnetic data stored in the magnetic layer 22 can be easily read by a conventional magnetic read head.

The current pulse required to drive the recording winding is
Typically, the pulse has a very steep rising edge and a gradual falling edge. Typically, the pulses have a maximum amplitude on the order of 20 amps and fall to values of 1 amp or less over time intervals of about 100 microseconds.

All of the operations described above for recording magnetic bits on the magnetic layer 22 occur in a time less than or equal to the interval between actuation of the type bar and release of the platen 42 before the tamper strikes it.

The magnetic bits are attached to the magnetic coating 1@2 while the platen 42 is fixed to maintain the recorded bits in alignment.
It is important that 2Kk be recorded.

magnetic erasure When the operator knows that an error was not made, the sentence ′,.

A device is provided for erasing the bits associated with the characters.

At this time, the operator presses the standard backspace key 27 until the character requiring correction is centered between the spaced apart vertical guide bars of the type guide 43. Make space. After the stamped characters are aligned with the type guide 43, the operator activates the error correction erase key 28 such that the permanent magnet attached to the key extension passes the associated reed switch in the process and causes it to close. Press.

Finally, in response to the closing of this switch, the erase control 7
1 induces a signal to energize the relay, and leads 50A and 50BK are connected to the connected terminal and recording winding 53-1...
...5! -8 are electrically connected in series and all turns of section B are chemically connected in series. Current supplied to one turn in section B therefore flows in the same direction through all other turns in that section, and thus across the entire width of the character space of magnetic dove 22.

After all the windings in section B are connected in series, the cancellation circuit 72 generates a plurality of short impulse coefficient current pulses having a waveform similar to a damped sine wave with a duration on the order of 100 milliJ seconds. respond to occur. The current supplied by erase circuit 72 to switch 38 is approximately 20 amps peak and 0! It has a moderate impact coefficient. Because of the damped sinusoidal waveform of the pulses applied by the erasure circuit 72 to the series connected windings in section BK, the magnetic flux is removed by erasure from the area where the character to be erased is located, and the magnetic flux is completely removed from the entire area of the character to be erased.

This is because the turns in section B are all connected in series. Therefore, even if a printed character and its associated magnetic data are perfectly aligned with the type guide 43, the magnetic bits representing that character are erased.

Magnetic erasure of characters centered between the spaced apart vertical bars of the type guide 43 in FIG. 4 can also be performed.

New L 1. - Magnetic erasure in and just before the area where characters are to be encoded can also be done. Additional erase modes may be entered manually by pressing the erase key 28 on the keyboard and/or automatically using movement of the type bar mechanism. Type guide 43
Each circuit used to effect manual and/or automatic erasure of an area on the air outlet layer 22 corresponding to a portion of the recording medium centered between the parts of the recording medium is described in U.S. Pat.
It is disclosed in No. 05.

In other words, in the manual erase mode, when the erase key 28 of the MD keyboard is pressed, application of erase current to that area of the magnetic layer 22 is started essentially before recording in the same area. Therefore, this manual erase mode is primarily used to modify previously recorded data. In the automatic erase mode, application of an erase current to a designated area of the magnetic coating layer 220 is started during normal operation of the keeper mechanism. Also disclosed in the above patent is an apparatus for sending an erase signal to the recording head of the present invention to provide both of these modes of operation of the head.

[Brief explanation of the drawing]

Figure 1 shows human readable data and magnetic data::5'
- indicates the state of the recording head of the present invention relative to the paper sheet and platen on which the upper left hand portion of the sheet corresponds directly to the characters printed on the front side of the paper sheet and is applied thereto by the recording head. FIG. 6 is a perspective view shown folded back to show the magnetic bit; FIG. 2 is a perspective view of a variation of a magnetic recording head in which a thin metal IJ tube is utilized as the recording conductor. FIG. 3 shows a typical arrangement of interconnect metal IJ tags that provide the recording section of the recording head. FIG. 4 is a perspective view showing an embodiment of a typewriter encoder constructed according to the present invention together with circuit blocks. FIG. 5 is a sectional view taken along the line 5--5 in FIG. 4, showing the relationship of the magnetic recording head of the present invention in combination with other parts of the tie 1 writer mechanism. FIG. 6 is an enlarged perspective view of a portion of a recording head frame and flux generating winding constructed in accordance with the present invention. FIG. 7 is a perspective view showing a device for bringing the magnetically covered α layer into contact with the windings of the recording head.

Claims (9)

[Claims] (1) Multiple aligned. an electrically conductive erase conductor having an erase conductor, the erase conductor accepting an electrical signal to erase a magnetizable surface opposite the surface;
and a plurality of recording conductors, each electrically conductive, having a magnetic recording surface disposed between and substantially interplaying with the magnetic erasing surfaces, the recording conductors being encoded. Since it accepts electrical signals, it is possible to magnetize MII according to the code f! A recording head characterized in that it is configured to impart magnetic polarity to opposing areas on its surface. (2) A number of recording conductors are provided on the head, and a magnetic erasing surface separates the recording conductors substantially equidistantly apart. ! I. The recording head according to item 1. (3) said erase conductor has a plurality of magnetic erase surfaces disposed on either side of the outermost recording conductor, said quantity also being arranged to erase magnetizable surface areas on either side of the outermost recording conductor; The recording head according to claim 2, (4) A recording head according to claim 3, wherein the magnetic erasing surfaces are provided on both sides of the outer recording conductor leg. (5) a magnetic eraser having a support of electrically insulating material, a plurality of interconnected electrically conductive members having an erase surface thereof placed side by side on said support for receiving an electrical erase signal; and a magnetic recording mechanism having a plurality of spaced apart recording conductors disposed in different pairs of intermediate members for receiving respective encoded electrical erase signals. A recording head for recording and erasing magnetic information on a magnetized medium. (6) It is provided in a large number of recording conductors spaced apart at substantially equal distances, and the erasing member is provided Km on both sides of the outermost one of the chronology recording conductors. distribution head. (7) The recording gutter according to claim 6, wherein the erasing member between adjacent recording conductors separates the recording conductors at practically equal distances. (8) The support body is in the form of an extension, and the magnetic erasing mechanism has a long wire rod having a plurality of turns wound concentrically on the support body, and Claim 7, wherein each winding portion constitutes one of said erased portions.
Recording head as described in section. (9) A recording head according to Paragraph 8 of Claim TdjA, in which each recording conductor is a single turn of wire rod mounted on the support between adjacent portions of wire rods constituting an erasing member in contact with each other. . a housing enclosing the αG recording support and having an opening of vIa therein, in which a magnetizing medium communicates with a region adjacent to the housing; A recording head according to claim 1, having a mechanism coupled to the housing for causing fluid flow through the opening in a direction forcing it toward the recording mechanism.