DE2028868A1 - Method for the repeatable evaluation of information recorded in latent form - Google Patents

Description

Patent attorney 20 2 böb Q Dipl.-Phys. Leo Thul

Stuttgart

A.E.Brewster-D.A. Weir-C.A. Watson-J.R.ttaxfield 68-44-6-1 INTERNATIONAL STANDARD ELECTRIC CORPORATION, New York

Method for the repeatable evaluation of information recorded in latent form

The invention relates to a method for the repeatable, section-wise evaluation of information recorded in latent form in the course of a continuous flow of messages, which information is recorded in Form of an electrographic charge image on a drum or tape-shaped carriers are temporarily stored.

Printing units, which with electrograflseher intermediate recording of the Information in the form of a charge image work, have the disadvantage that not with an uninterrupted flow of messages it is possible to obtain multiple copies of the recordings. In addition, these devices continue to be disadvantageous to see that the information cached and made visible by dusting only comes into the field of vision of the viewer when a certain number of consecutive cells have been recorded.

The object of the invention is to avoid these disadvantages.

According to the method according to the invention, this is achieved by that the carrier has a beginning or a length which the Height of two sections corresponds to that the information each-. wells stored line by line and together in one of the two Sections of the carrier are transferred as the carrier respectively executes a full revolution between the transmission times of the successive lines of information and that during this Turns of the other section of the carrier * to evaluate the information previously transferred to him is available.

Ip.6.1970

vky / eoh 10ft09 / IfIO

BATH

Using an exemplary embodiment, the invention is related explained in more detail below with the drawings.

The drawings show: Figure 1 is a dramatic representation of an electrographic

Printing unit in which the method according to the invention can be used.

FIG. 2 shows a simplified modification of the derate from FIG. 1.

Figure 3 and Figure 4 simplified arrangements according to Figure 1 and 2, respectively, with soft the printing drum is replaced by a rotating magnetic tape.

Figure 5 is a schematic representation of an arrangement which can be used instead of a strobe lamp.

The electrographic printing shown schematically in Figure 1 and display device includes a magnetic set in continuous circulation in the direction of arrow A by means not shown Storage drum on. The speed of rotation is adapted to the line information. Their length is in the range between 228 mm and 5/4 mm. Just above the drum surface 4 is a multi-channel magnetic recording head 2 is arranged, about which by a suitable electrical signal control on a corresponding magnetic charge pattern over the entire length the drum is applied. Associated with the recording head 3 is a code converter which receives the input numerical signals, for example for the charge image to be created In correspondingly · converts control signals.

The speed of rotation of the drum 1 is so high that Jodes Tellbildabftehnl & tee makes one "¥ © 11" revolution during the time of production. This interpretation of the devices'ermögiie.'i * .t m "each Teilbildabschnltt at any point of XrasjMloberfleV che raise fourth Thus, the # Umlaufg®βdiwiMdigkeiS of the mel with a character totality of, for example, 2 $ Q® Band * äv

A.E.Brewster 68-44-6-1

500 characters / sec., Ten revolutions per second. In these Case it leads one full revolution in each case in the time of the Smpfangb from thirty characters. Aa hand of the drum 1 applied clock tracks serve to indicate the angle · 1 position of the drum at every moment be able to determine exactly. The clock pulses are picked up by a scanning head 14, which establishes the necessary synchronization between the drum position and the recording head control. This makes it possible to apply every part of the incoming information at any desired point as a charge image on the drum surface and the individual sections in each to bring any assignment to each other.

With a reception density of three hundred characters / second, the Characters in cell groups of thirty at a time one drum revolution one after the other along the drum shaft to the applied to predetermined locations. There are two in this handling 30-character line space required, which alternates with the Input line to be connected and each of the following group of record thirty code characters. The bin storage remains so long until the drum is in the intended recording position. When the intended drum position is reached the thirty characters are spilled out parallel to the Code converter on the individual tracks of the magnetic head 5, through which the transfer in the form of a magnetic charge image the drum surface 4 takes place. The recording takes place in the time in which the trownel surface has rotated further by the height of one character.

In the meantime the second line memory is filled with the following code characters. With the completion of the first drum revolution, the second line memory is full, while the first is empty again at this point of the tent. The roles of the two cell memories are reversed by switching, with the second line memory remaining in the waiting state until the drum moves is in the recording position predetermined for these characters. This sequence repeats itself until the drum is full,

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With each revolution, the drum surface passes a dusting device 5 * through which the surface 4 with a fine-grain magnet powder is dusted, which in its hue contrasts with the preferred heal hue of the drum surface 4 is available. That which remains on the surface 4 at the previously magnetized points Powder thus makes the recordings visible.

Then the drum surface treated in this way passes a viewing station, in which the recordings on the surface 4 can be viewed through a viewing window 8 via a mirror 6 can. The mirror 6 causes an upside-down playback ™ be the recordings, so that the recording by the write head 3 must also be upside down in order to be readable Get typeface. With regard to the field of view, the diameter of the drum should be selected so large that the The viewing area is not subject to excessive curvature. Due to the high speed of rotation of the drum, precautions must be taken that the latent records are also legible. This can be achieved with the aid of a conventional stroboscope lamp 13, which is directed towards the viewing area.

Un when looking at it does not give the impression of a blurred image it is necessary because the strobe flashes are very short. This means that a very high output is required.

The strobe flashes are synchronized with the rotating drum or belt in such a way that a single flash of light is generated during each cycle of the drum or belt. The respective flash of light is triggered when the associated sub-area of the recording is in the viewing position. In this way, it is possible to compare two or more sub-areas by appropriately assigning the light foil, in that the sub-areas are superimposed on one another in a freely selectable manner.

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For example, if it is necessary to use a set of character lines as the one Partial area, with a different set of character lines than the others Subarea, to be compared, the two flashes of light to be generated within a drum or belt revolution can be triggered in this way that the sub-areas appear superimposed when viewed, whereby the lines of one sub-area come to lie in the spaces between the other sub-area. In this case it is Of course, it is necessary that the space between the lines is large enough to accommodate another line of characters *

The storage drum 1 completes its circulation as it passes through the printing station 9 and the downstream cleaning station 7, where the magnetic powder adhering to the drum surface is removed, to then start a new revolution with the passage under the magnetic recording head 5. I depend on the Operation of the latter can optionally erase the previous recording by a demagnetizing device 3 a provided will.

The magnetic recording head 3 can take many forms. A basic support must be fulfilled, namely that he extends over the entire recording length of the drum and one Has a large number of recording tracks and composes the characters in rows according to the mosaic principle.

The printing station 9 comprises a paper supply roll 11, from which a continuous paper web is guided over a pressure roller 9 'which presses it against the outer surface of the drum 1 in the event of a recording transfer. During this process the movement of the drum 1 and the paper web is in the direction and speed the same. As the drum rolls on the paper web 10 under pressure, the magnetic powder image is transferred from the drum surface 4 to the paper web 10 in a manner known per se. , .For this reason it was already in the application of the charge image on the drum 1 by ά · η recording head 3 of this Uta-Cod

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This is taken into account in that these recordings have already been made the wrong way round « ao that legible viewing is only possible via the aforementioned mirror 6. After the transfer, the paper web 10 runs through a heating device 12, which fixes the powder image on the paper web 10 by the action of warnings. This then emerges from the device housing at a suitable point.

It is clear that if the pressure roller 9a is kept constantly in contact with the drum surface 4, all information or parts thereof are imprinted as soon as the drum rotates, with each part or parts of the information being imprinted several times will. This way of working is of course undesirable. Rather, there is a requirement for a continuous display of the information received, but at the same time it should be possible to create one or more copies of certain parts of the information displayed under the control of the operator. For this reason, the application of the pressure roller 9a on the drum surface 4 is effected by a controllable lifting magnet 9b. This magnet and the paper transport motor 9c can be controlled either by the operator via the release button 19 or by the signal input via a detector device 18, a control device 15 being interposed in both pills.

The time can be determined by an information transmission signal to which the print can be made. For example, a short message of thirty or fewer characters can be printed immediately after the first turn of the tronmel, while in the case of a long message of e.g. ninety cells of ninety characters each, two hundred and seventy tronmel turns are solemn to complete.

The sheet length of the individual prints can be changed separately. ä @ n paper transports »chanismus beirnt«, Di® iJBng »üem setelftfeidfrei Forward travel is determined by a ®Ktapr © eli®sid © ii l ®rwQwaofoub äöi ³ ■ fap & erbahn before the pressure roller host created 9a, M gleiofc "Mais® result of lower sohriftfzvie band indeia <a £ @ 'Papi @ rfoalm after . Lifting off the pressure roller §a, a @ efe ura @ira «a hQBtismZem Bstrag is terbcwegt.

With the assumed total running speed of the drum 1 out of ten The entire Troamel surface runs ten times in revolutions / second the second passes under the pressure roller. Thus, with a precisely timed control of the pressure roller 9a ten copies per second of each »section created on the drum circumference will. Thus, while recording in a section can still is going on, a pre-recorded section for evaluation can be used. E.g. a drum with a circumference of 635 μ can be divided into e.g. two sections the size of a page of text, every 317 ran up, subdivide. Assuming any of these Pages contain ninety cells of ninety characters each, two hundred and seventy copies of each can be made, while at the same time the other half of the drum is covered with two hundred and seventy groups of thirty characters each. As soon as the required number of copies made from the first half of the drum 1st, the recording on this section can be deleted in order to be ready to receive the third page of text. Oils recording of the third side can begin once the recording is completed, etc. If a sheet is provided with only a group of thirty characters, only one copy of the previous page is possible. In practice, however, it rarely happens that more than twelve Copies are needed. This can always be achieved if the following page contains at least four full lines of text.

The fact that the device is able to provide a continuous or interrupted flow of information in the form of code characters a speed of ten to six hundred characters / second to process, does not require that the drum necessarily with the the aforementioned speed rotates. With an increase in the code characters located in the cell memories, the speed of rotation of the drum can be correspondingly lower, whereby the The demands on the dusting device 5 become less and a reduction in the paper transport speed would be associated with this.

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From the foregoing it can be seen that by the method according to the invention it is possible to end the recording of one information page and continue the recording on the next page, without interrupting the incoming flow of information or losing information. At the same time it is possible during the Record the information on one side in the course of each Rotation of the drum 1 in a known manner a copy of the other Page to create.

That described in detail in connection with the printing unit of FIG The method according to the invention can of course also be used with devices of a different design, some of which are exemplary below Executions are briefly described.

For example, the presentation of the viewing area can through the omission of a mirror 6 and the application of the latent recordings on the drum surface in a directly readable form be simplified. In this case, the inversion of the magnetic powder image must take place in the course of the transfer to the paper web 10, so that the writing on the prints also appears in the correct order.

Figure 2 shows a modification of the device of Figure 1 which operates in the manner described above. The parts Jk and assemblies not shown remain unchanged. In this version with a direct view of the viewing area, the viewing window 8 is on the other side of the housing.

The drum surface 4 comes into contact with a planned pressure evaluation after passing the viewing area. a transfer roller 111 which is pressed by a magnet, not shown. In the process, the magnetic powder image on the drum surface 4 is transferred to that of the roller 111. In the course of its rotation, the roller 111 prepared in this way then comes into contact with the moving paper web 10, which has the same linear speed as the roller 111 during the transfer printing process

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owns. As a result of the counterpressure of the roller 9a, the powder image is transferred to the paper surface under pressure from the roller 11 in a readable form transfer. Which adhere to the surface of the roller 111 remaining powder particles are in the course of their further rotation removed by a suction device 114 before the roll surface comes into contact with the drum surface 4 again.

In this case, the use of special technical means is necessary because the magnetic powder does not easily adhere to a conventional soft transfer roller. For this reason is the roller 111 on its surface with a uniform mosaic provided with magnetic points or the roller has, for example, a thin layer of rubber with a suitable structure and a sticky surface.

The 4ite © * Ti magnetic point mosaic takes the powder image from the drum surface 4 without any loss of quality. The transfer to the paper web takes place in the manner described above by pressing into the Paper fibers with subsequent heat treatment. The required heat is generated here as a result of the contact pressure during the transfer. This can be large enough to cause the powder particles to fuse with the paper, so that in this case none separate heater 12 is required.

If the transfer roller 111 is provided with a rubber pad, so causes the sticky structure of the rubber a relief of the transfer from the drum surface 4 to the paper web 10 the pneumatic arrangement shown in FIG. 2 is also used for this arrangement Suction device for removing the remaining powder particles which are still adhering to the roller 111 after the transfer.

The drum 1 used in Figure 1 and Figure 2 can be replaced by a magnetic tape suitable width, which is designed in the form of a loop guided around pulleys, can be replaced.

FIG. 5 and FIG. 4 show simplified modifications of the one shown in FIG and FIG. 2 illustrated arrangements in which the printing drum 1

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is replaced by a magnetic tape la. That as a closed loop trained band la is guided by UK steering rollers 2 and by a Motor 2a driven in the direction of arrow Ä.

In these drawings are parts that are in their construction and puncture with the correspondence shown in Figure 1 and Figure 2, provided with the same reference numerals.

Like the surface 4 of the drum 1, the belt la, in contrast to the magnetic powder, also has a bright reflective surface. As can be seen from FIG. 3, the recording head 3 is located on the opposite side of the tape 1 a with respect to the surface to be dusted. This arrangement was chosen in order to avoid the wear of the head 3 by powder residues. In this case, the tape la must be designed so that the magnetic recording can take place in penetration through the tape material. To produce the copies, the paper web 10 is brought into contact with the tape surface in one of the ways described above using the rolling process.

It should be noted that the above applied to magnetic The processes described in the printing units according to the invention do not apply to them Application limited 1st, but with many other printing principles can find a meaningful application.

An alternative to the stroboscopic device described above is shown the schematic representation of FIG. 5 essentially consists of welch® one between the drum or belt surface 4 and the viewer arranged, rotating glass rod 16 square cross-section with a sufficiently high refractive index.

The glass rod 16, which has a length corresponding to the width of the drum 1 or of the strip 1 a, is set in rotation in the direction of arrow Y by means not shown. The relative rates are 4 and surface of the glass rod 16 are matched to each other, ü @ & B di fortschreitend® movement of the records on the surface 4 due to the refraction 'is exactly compensated in the rotating glass rod.

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The thickness of the glass rod 16, the index of refraction and the angular velocity must be such that the line viewed through two opposite sides of the rod is optically deflected, which the movement of the drum or belt surface 4 in the viewing area exactly compensated.

With certain operating modes it is still necessary to have a provide pulsating light source 17 in order to superimpose different Avoid partial recording areas on the drum. In this case, however, the light pulse duration is as long as the area of the surface 4 to be observed remains visible through the glass rod 16.

When the angular velocity of the drum or belt and the Glass rods 16 are essentially the same and if the part or parts to be viewed is not more than a quarter of the Take the drum or band circumference, then a constant lighting the surface 4 take place. In this case, a pair of polarization units should be used to prevent superimposition Find use, the one unit between the glass rod 16 and either the surface 4 or the viewing window 8 to be arranged while the other is to be attached to a surface of the glass rod 16 is.

The one mentioned polarization unit can through the viewing window 8 can be formed. The (| Adjacent surfaces of the glass rod 16 are marked with an opaque Covering provided. The polarization units are in the line of sight twice during each revolution of the glass rod 16 Operator. However, the arrangement is designed so that the viewing of the surface 4 only in one of the bar positions, i.e. if the image part or parts to be viewed are in the viewing position, is given.

In order to ensure a stabilized image of the recordings during the successive revolutions of the drum or the belt, is the speed of rotation of the glass rod 16 on the orbital

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matched and synchronized with the time of the drum or tape.

On the other hand, the stabilization of the visual image can also be achieved by swinging the glass rod «« 16 \ m its axis *

5 claims

4 sheets of drawings with 5 figures

BATH ORIGINAL

Claims (1)

Claims (Tj method for the repeatable, section-wise evaluation of information recorded in latent form in the course of a continuous flow of messages, which information is temporarily stored in the form of an electro-graphical charge image on a rotating drum-shaped or band-shaped carrier, characterized in that the carrier (1,1a) has a circumference or has a length which corresponds to the height of two sections, that the information ^ j is stored line by line and transmitted together in one of the two sections of the carrier (1, la), that the carrier (1,1a) executes a full revolution between the transmission times of the successive information lines and that during these revolutions the other section of the carrier (1,1a) is available for evaluating the information previously transmitted to it. 2. Arrangement for carrying out the method according to claim 1, characterized in that the carrier (l, la) is provided over its entire circumference or length with clock tracks, which is assigned a scanning head (l4) and that through this scanning head (14) the time of transmission of the line at the stored infor- mation i is determined on the support. j5. Arrangement for carrying out the method according to claim 1, characterized in that the carrier (1, 1 a) can be seen over a limited area after it has been dusted with electrographic powder and is illuminated by a pulsating light source, the cycle of which corresponds to the Ural course of the carrier (1, 1a) synchronized 1st. 4. Arrangement for carrying out the method according to claim 1, characterized in that the carrier (1,1a.) Can be seen after dusting with electrographic powder over a limited area and that in the viewing direction in front of the »carrier. (1, Ia) ' .. ratio sz _BATH A.E.Breweter 68-44-6-1 ~ 14 - across xu deesen l & slimfrichtung a ßlftsafcab (16) »it square ·« Cross-section is arranged, which spiehroii to the circulation cycle The carrier (1, Ia) rotated or in SeSiifisigsmg heel set will. 5 * Arrangement according to claim 4, da ^ uyeli ^ kgimzelohfiet »that two are «dafi one of the remaining areas of» covered in the unit i «t and ü & B ®ira d®n a viewing window (8) a» second PölarisatioKSgiriiSieit blMet. June 10, 1970 ir Empty soap