DE1436651B2 - DEVICE FOR TRANSFERRING IN A SERIAL PRINTING DEVICE, FOR EXAMPLE A TYPEWRITER, FOR THE DISPLAY OF THE CHARACTERS FROM A RESERVE TO A WRITING SHEET - Google Patents

Description

The subject of the invention is a device for the transmission of in a serial printing device, z. B. a typewriter, to display the characters serving color particles from a Reservoir on selective areas of the respective writing position of the writing sheet, with the color particles are held electrostatically by the carrier conveying them and one in the writing area Photosensitive layer acting on the electrostatic field of the carrier is provided.

Such devices are known per se. However, an aforementioned device, in particular on a typewriter. There it is necessary that individual characters can be selected via a keyboard and put on paper. You also need to be immediate be visible immediately after writing. In addition, the quality of the typeface is the one must be at least equivalent to the usual typewriter. Research has shown that the The quality of the typeface largely depends on the uniformity of the distribution of the color particles depends on the surfaces of the carrier. The aim of the invention here is to distribute the color particles be adapted to the requirements on the surfaces of the carrier. It is therefore suggested that that the color particles enter the recording area via at least two carriers connected in series be brought, with the surfaces of two adjacent carriers move to their transfer point relative to each other. Their neighboring ones moving relative to one another Carriers ensure an even distribution of the color particles and thus a clean one and flawless typeface.

In a similar device according to U.S. Patent 2,890,923, it is known to have a relatively high Effort to spray the color particles on a carrier. However, this spray device will not be can achieve uniform distribution of the color particles on a carrier.

According to a further feature of the invention, it is expedient if the to promote the color particles serving carriers have different conveying speeds, preferably the following carrier in the conveying direction has a lower speed than the preceding one. Embodiments of the device are described below and with reference to the drawings explained. The drawings represent the following. F i g. 1 shows an arrangement in which a narrow, endless band of carriers in the recording area at a short distance parallel to the recording surface and perpendicular to the line direction

ίο is arranged,

Fig. 2 shows an enlarged exemplary embodiment of the carrier according to FIG. 1 on average,

F i g. 3 a an arrangement in which the carrier in the recording area via a fixed, is guided by the effect of radiation electrically and / or magnetically influenceable, photoconductive layer, F i g. 3 b shows an arrangement according to FIG. 3 a, but with protective layer,

F i g. 4 a an arrangement in which both the removing the paint particles from the storage container first carrier and also the second carrier, which takes over the particles from the first carrier and transports them into the recording area, as a rotatable disk is designed, in side view,

4b shows an arrangement according to FIG. 4a in Front view,

F i g. 5 a a film carrier with tooth-shaped protruding Support surfaces, seen from the recording surface,

FIG. 5b shows the same carrier according to FIG. 5a, seen from the radiation source,

F i g. 6 shows an arrangement in which the first carrier as a disk and the second carrier as a disk with tooth-like projecting support surfaces is formed,

F i g. 7 shows an arrangement in which the second carrier is a stationary one designed as a vibration conveyor Rod is provided, which takes over the color particles from a disc-shaped first carrier, F i g. 8 shows an arrangement in which a, in front of a fixed paper holder, can be displaced in the line direction, a recording head containing a carrier system with a parallel to the recording surface incident beam is provided perpendicular to the recording surface deflecting mirror. As from the schematic representation of an exemplary arrangement for carrying out the invention Recognizing the recording method in FIG. 1 is a rotatable disk 1 first carrier provided, the means explained in more detail below by the action Color particles 3 from a storage container 2 takes over, in which they in a known manner be whirled around in a stream of air.

With an area diametrically opposite the transfer point, the disk 1 lies in a small position Distance parallel to the surface of a second carrier designed as an endless conveyor belt 4, the is guided over rollers 5 and also at a small distance parallel to the recording area the recording surface 6 runs.

In the takeover areas, d. H. at the points where the paint particles from the storage container 2 to the first carrier 1, from there to the second carrier 4 and finally from this to the Recording surface 6 are transferred, primarily controllable magnet systems 7, 8 and 9 are attached, which have the task of

effect of their field on the magnetically influenceable color particles to exert an attraction of the particles in the direction of the pole face and thus to bring about their transfer to the next adjacent carrier. Instead of or to support the action of these magnets, electrodes Ta, 8a and 9a connected to the high-voltage potentials E ₁ , E _H or E _a can also be provided as required. The electrodes can also be formed by the pole faces of the magnetic bodies themselves, so that these are possibly directly connected to the high-voltage potentials.

Arrangements are also conceivable in which alternating voltages are superimposed on the holding potentials at at least one of the transmission stations in such a way that on the takeover side, e.g. B. at 8a, the holding potential E _H periodically increased by a pulse voltage of appropriate frequency and at the same time on the delivery side, z. B. at 1, the holding potential E ₁ is periodically reduced by a synchronous, 180 ° phase-shifted pulse voltage. By adding up the instantaneous values of the voltages effective at such a transmission station, with relatively low maximum values of the voltage amplitudes at a suitable transmission frequency, on the one hand, reliable transmission of the particles and, on the other hand, adequate adhesion to the respective carrier can be ensured.

In detail, the electrophysical ones are used for the electrostatic and magnetic particle takeover Properties of the color particles 3 and the carrier 1 and 4 in a known manner according to the electrostatic and / or magnetic requirements. There are many variations possible. For example, the carrier can consist of electrically conductive material and directly be connected to the holding and takeover potentials. It is also possible to use the Manufacture carrier made of electrically insulating material and with a to a suitable potential connected conductive layer to be provided over which the photosensitive layer is applied.

With the formation of the one immediately adjacent to the recording surface 6, in the area of the radiation Carrier 4 made of conductive material or with a conductive layer must be taken care of be that this layer is made radiolucent.

The ink particles are generally used to facilitate heat-fixing of the written characters consist of a thermoplastic base material to which color additives are added. If necessary, the color additives can either themselves have ferromagnetic properties, or ferromagnetic substances can be added separately to the base body of the particles.

The electrostatic holding or transmission forces can be carried out in a manner known per se charges sprayed onto the carrier or by the effect of the influence on the conductive layer of the The potential connected to the carrier can be exerted, with the color particles correspondingly if necessary their electrical property itself with an additional positive or negative charge can be provided.

In connection with the application of the exemplary embodiment described, it is also provided that the respective opposite surface parts of the first carrier 1 and the second carrier 4 move on their path at different speeds. In an advantageous embodiment, the speed V _{1 of} the effective surface track of the disk 1 can be a multiple of the speed K 1 of the carrier 4.

For the transmission of the typeface to be recorded, as already proposed, the radiation source 10 and the template carrier 11 provided for the optional profiling of the beam 12 are attached within the endless loop of the carrier 4. The temporal effectiveness of the radiation source as well as the currents controlling the transmission magnets 7, 8 and 9 and / or the electrostatic potentials E ₇ , E ₈ and E ₉ can, for example, interact with the keystrokes of a typewriter keyboard using a keyboard that is customary for such purposes and is therefore not described here electronic time control can be effected automatically. y

An example embodiment of the carrier 4 is shown on a greatly enlarged scale in FIG. 2 shown.

4 a therein is a radiation-permeable film body made of a flexible, insulating material. The surface of the film body facing the recording surface 6 is covered with a radiation-permeable, electrically conductive layer 4 b, e.g. B. od a vapor-deposited metal layer. Like. Provided, which in turn is coated with a thin, photoconductive layer 4 c of a known type.

Of course, at the edges of the conveyor belt lying outside the recording area the photoconductive layer is missing. For this, the aforementioned conductive layer can be galvanized here be reinforced so that they can be connected to suitable contact means, e.g. B. contact rollers, with an outer Potential can be connected.

The procedural mode of operation of the arrangement described so far is as follows:

By the influence of the transfer magnets 7 and / or an electrostatic voltage E ₁ [is continuously transmitted upon rotation of the disc 1, a portion of the pulverized, mixed up swirled in the reservoir 2 color particles 3 in a thin layer on a circular ring area of the conveyor belt 4 facing surface of the disk 1 and held there by electrostatic forces resulting from a voltage E _1. As a result of the current inhomogeneity of the dust vortex, the precipitation of the color particles on the recording track of the disc 1 will have a certain unevenness, which, however, changes constantly in structure due to the constant movement of the dust vortex over the length of the entire recording track of the disc 1.

In addition, since the speed ratio between the mentioned recording track of the rotating disk 1 and the conveyor belt 4 can assume a value V ₁ ZV the disk I. However, this means that the carrier 4 due to the statically changing distribution of the particles on the receiving track of the disc 1 with a largely uniform color

7 8

dust layer is provided, which also causes essential uncontrolled potential relationships

is thicker and stronger than a layer can be.

could, in the case of a one-time direct transfer, so that the retention of the transferred color

Carrying from the storage container to the conveyor belt particles is also ensured if

would be applied. 5 already a relative-

On the carrier 4, as already mentioned, displacement between the paper carriage and which the color recording system transmitted from the disc 1 has occurred by one or more particles through the steps lying on its metal layer can be provided that potential and / or by means of a spray applied to the basic field in a not shown but near device 13 (FIG. 1) applied electrostatic charge in a lying manner by expanding the pole face. The holding of the magnet 9 and / or the high-voltage electrical forces can be selected in such a way that, despite the switched-on trode 9 ", the transmission magnet 8 and / or the transmission is locally shaped in such a way that the respectively transmitted powder image of a voltage E ₈ adheres to the Color particles on the character are sufficient even after several indexing carriers, they remain unchanged during its feed movement 15 gene. That has to take away from the transmission area. term advantage that with typing errors in these places

The movement of the carrier 4 and thus the still simple elimination of the transferred

Introduction of the color particles in the recording characters without erasing is possible. The elimination

area can either be gradual or whatever for the creation of such a sign can be about means

a high writing speed and a simple 20 of a brush, by a magnet, by a

structural design of the drive advantageous electrostatically operating auxiliary device or the like.

is to be done continuously. take place. Likewise, removing one is wrong

As soon as the carrier 4 according to the above-mentioned character through a suction nozzle with a sufficiently strong Hch, which is provided with the circulation device for the in and uniform color powder layer, 25 paint to be swirled together in the reservoir, the first printing process is connected to particles on the keyboard can be. The distant color pipe. In this way, in the stencil carrier 11, the characters to be printed are automatically fed back to the supply of characters to be printed in a container that is already present,
whose position is selected and in connection with this, it is conceivable that a subsequently the radiation source 10, ζ. B. a 30 of these possible extinguishing devices from a be light source, switched on. To press the special delete key generated in this way, so that a filmed beam 12 hits the carrier 4, misspelled characters penetrate by hitting the key and the radiation-permeable key can be removed again immediately. Foil body 4 a as well as the electrically conductive In order, on the other hand, to fix the transferred layer 4 b and reach the characters in the layer 35, the following photosensitive, eg photoconductive layer 4 c. an on the recording area in line direction, it produces in local, the projecting device following line section means to be effective, writing image corresponding areas a reduction in the known manner by softening the electrical resistance of the layer. At or liquefaction of the thermoplastic components can therefore, as the dye itself knows its solid connection, introduce the electrical charge of the surface of the recording surface. For example, the carrier 4 to the electrically conductive layer 4b can flow locally in this line section, so that the color particles 3 now with trimmed and time-limited infrared radiation cause a reduced force held on the conveyor belt to heat the powder images. Become another. 45 possibility is that the transferred

At the moment of the local lowering of the stop characters when advancing in the line direction a force, ie at the same time with the occurrence of the high-frequency dielectric and / or magnetic radiation 12, the transmission field of the alternating field will pass that the color particles for the gnets 9 and / or the electrostatic field of the pot-fixing process is sufficiently heated,
Tials E ₉ effective in such a way that now all 50 units can, of course, also be heated by convection of the recording surface held on the carrier 4 with reduced force. Color particles over the small air gap s of two. On the back of the recording mode of play 0.2 mm, a heating surface 6 adjacent to this can suddenly be transferred onto the surface and there can be seen which the writing surface locally corresponds to the projected characters corresponding, read 55 heated up to the permissible temperature. Another bares, initially not yet fixed powder image is a possibility, that one just as well represent. a line segment of effective hot airflow

The color particles that are transferred in this way onto the recording surface 6 directly onto the transferred characters can act by a ma-. The turbulence of this air flow must be gnetic pre-excitation, of course, by the field of an additional 60, so that the adhesive forces, the borrowed permanent magnets and / or a static bias of the powder image on the recording surface 6 are not overcome ,
can be held. If this is to be done electrostatically, in all the mentioned cases of fixing the par position of the particles, a regulation can be useful to fix the electrode on the back of the heat supply depending on the Schrcib-Aufzeiehnungsblattes lightly be realized.
To provide an insulating layer so as not to be caused by a target in the above-described procedural different conductivity of the recording arrangement of the carrier 4, as mentioned, with a

οπή Γ ""> τη

9 10

continuous speed are driven and the carrier 14 a solid with the photoconductive the, then the feed path in the second at the layer connected protective plate should 15 c voreiner maximum writing speed of 30 lines, which is only across its surface is electrically conductive approximately thirty times the extent per second. Such a thing Corresponding to the height of a character, so around 5 platelets can, for example, consist of one in itself 100 mm, so that when printing a text-glued bundle thinner, mutually more isolated sign did not cut out gaps in the previous impression and then apply wires to the In the powder layer of the carrier, the new impression is polished on one side as a sliding surface and falsified on the other can. However, where it does not combine so much on their side with the photoelectric layer if absolutely flawless characters arrive, io will be seen. Then the photoconductive especially when on average with essential layer of the plate conductive with the base plate borrowed lower speed is written, 15 a connected.

probably half of this value, so also with the execution explained above

50 mm / sec, completely sufficient. Approximate example on the carrier 4 are electrostatic

As soon as the transmission field is due to about 15 bound charges when the radiation occurs

Activation of the magnet 9 is effective, subject to locally derived by the photoconductive layer 15 b,

the released in the manner described and whereby the color located at these points

particles 3 migrating from the carrier 4 to the recording surface 6 are exposed to a reduced holding force

the particles are both in their inertia and from the field of the magnet 9 and / or from

the direction of movement of the carrier as well as an electrostatic transfer field on the

magnetic acceleration are transferred in vertical Rieh recording sheet 6,

direction to the recording surface. Another constructive solution will show the

movement component in the direction of the conveyor belt Fig. 4a and 4b, in which instead of the conveyor

due to the resistance of the surrounding air, a body of revolution 4, z. B. a disc 21,

hesitates, while the velocity is provided perpendicular to the 25 whose area in the recording

Recording surface through the accelerating area parallel and at a small distance opposite

Field is further increased. the recording sheet 6 is arranged and the

Assuming a distance between the axis 22 is rotatably mounted in line height. The conveyor belt 4 and the recording surface 6 of rotation of the disc also takes place gradually about 0.2 mm and an average transmission 30 or continuously. In parallel and at a low speed of the color particles of 10 ^{: 1} mm / sec stood to it as the primary means of conveyance, a rough calculation of the deflecting body of rotation, here also a disk error with a maximum value of about 10 ~ - mm. 23, which is rotatable on an axis 24, but such a slight deflection is superimposed. It serves in cooperation with the teres permissible, especially since it has a uniform effect on the 35 magnet 7 and / or an electrostatic transferring whole characters and therefore carrying system 7 α in the manner described for only a practically undetectable total removal of the color particles from the Displacement of the supply in the direction of the carrier movement, container 2.

works. The disk 21, which is very advantageous per se, therefore consists of at least one Continuous movement of the carrier does not require any 4 ° of their rotation to rethink the recording area opposite. stroking circular ring area from an electrically

In a modification of the instructions explained above, radiation-permeable material or in order to the method according to the invention, a radiation-permeable, non-conductive material is given numerous other possible solutions. material that is supplied to the recording sheet 6. First, the embodiment according to FIGS. 1 45 turned side with a conductive and radiation- and 2 modified to the effect that the transparent layer is covered. In addition, running, endless carrier made of a very thin, it carries an annular photoconductive layer 21c.
unprepared plastic tape 14 made of insulating The transfer of the color particles is made in ana-material. As FIG. 3a shows, this slides logically as in the case of the pre-belt explained in relation to FIG. 1, after it is provided with an electrical charge in a spray device 13 50 passage by the action of the magnet 8 and / or (FIG. 1) electrostatic system 8a on the color particles deposited on the disc and on the 23 facing the recording surface 6. The side has been coated with paint dust 3, using the rotating guide plate 15, which is also expedient in this construction, the base number of which is the disk 23 to be larger than that of the body 15 α electrically conductive and at least 55 disk 21. The on the disk 21 recording area is transparent to radiation and the transmitted color particles 3 is covered under the influence of b which faces the conveyor belt surface with a beam 12 selectively photoconductive layer in the same manner 15th transferred to the recording sheet 6.

As with FIG. 2 explained, can of course with the explained method and its

also between a non-conductive base body 60 implementation previously proposed example

15 a and the photoconductive layer 15 & an elec-

Trically conductive and radiation-permeable layer drawing process with continuously moving

be provided. Carrier 4, 14 or 21 that the

To the photoconductive layer drawing sheet 6 shown characters only visible in this arrangement

15 b before an undesirably strong abrasion by 65 if the recording device or the

to protect the plastic tape 14 sliding on it, paper holder by the stepping mechanism of the

an embodiment according to Fig. 3b can be selected machine in one of the next Zcilenpositionen

the. It has moved between the photoconductive layer. Generally one will

can easily accept, especially since, as has already been explained, a misspelled one Character can still be erased without erasing in the second or third switch position. aside from that either the recording system or the paper holder can be temporarily activated by means of a control button can be shifted by an appropriate amount, whereby the written character for the Scribe becomes visible. Finally, with automatic writing machines, what is just written is visible Characters not required because the characters you write are in a punched tape or the like. Are pre-stored and are therefore not subject to any direct source of error during the write process.

If one nevertheless wants to have the respectively written character under control at all times, a procedural device can be provided in which a carrier 31 according to FIG. 5 a is used. 31a therein is a radiation-permeable film strip which, in terms of its width, represents the base body of the carrier. A radiation-permeable metal coating 31 b is applied to it. This coating is then covered in the narrow hatched areas of areas 31 c of a photoconductive layer.

In this case, the carrier formed in this way is controlled by a switching mechanism controlled by the keyboard progressed discontinuously in the rhythm of the writing process. It is done in the same way as in Fig. ] shown, the color powder 3 in dotted by the magnet 8 and / or the electrostatic system Drawn areas 31 ei transferred to the carrier.

The selective transfer of the particles to the recording sheet 6 then takes place in a Way, as they are also already shown in FIG. 1 has been explained.

F i g. 5 b shows the carrier for this writing system seen from the side of the radiation source. As one recognizes, after each writing process, the written character is through one of the free areas 31a immediately readable in connection with the text previously written in the line as soon as following the extinction of the radiation, the carrier 31 is automatically advanced by an amount determined by the height of the recording area.

Similarly, as shown in FIG. 6 shows that the writing system according to FIGS. 4a and 4b can also be modified for the step feed. The carrier 36, which is designed as a circular disk, can be coated in a very similar manner to the strip 31 of FIGS. 5a and 5b. The radiation-permeable conductive layers are each limited to tooth-like arranged surfaces 36b, which are in conductive connection with a metallization 36c of the central disk area facing the recording surface and are connected to the high-voltage potential F via this. The conductive surfaces 36b are, corresponding to the areas 31c (FIG. 5a), covered by individual photoconductive layers.

The transfer of the color particles to the individual intermittently advancing tooth surfaces 36 ft, as in the embodiment according to FIGS. 4a and 4b, also in this case by a carrier 23 designed as a disk.

As shown in FIG. 6, the respective written character is immediately visible in the exemplary arrangement shown therein as soon as a tooth gap 36 α releases the last written character due to the automatic advancement of the disk 36.

From the multitude of possible constructions as a basis for the implementation of the principle Recording method is yet another embodiment in FIG. 7 shown schematically, which avoids a circumferential carrier carrying the color particles into the recording area and thereby completely eliminates any signs of wear and tear. In this case, the carrier consists of a flat, elastically suspended rod 41, which is only slightly wider in the direction of the rows than the actual one Recording area. It consists essentially of a radiation-permeable material and can, as with the systems already described, either with a radiation-permeable, be provided with an electrically conductive layer or consist of conductive material itself. In the recording area it is also on the side facing the recording surface 6 with a photoconductive one Layer 41c covered.

The side of this carrier 41 facing the recording surface are conveyed by conveying means, such as they have already been described, e.g. B. by a disc 23 removed from the reservoir 2 Color particles 3 expediently fed at the lower end.

The carrier coated in this way is known per se and therefore not explained in more detail here Medium, e.g. B. by piezoelectric drive systems 43 and 43 ', in a similar manner to known ones Vibratory conveyors set in vibration. Thereby act on the supplied color particles besides the When the paint particles are fed underneath, the force of gravity to be eliminated is that of the vibration system generated acceleration forces and the previously mentioned electrostatic holding forces and cause together a time-defined migration of the finely divided particles from the lower end of the Rod towards its upper end. Of course, the reverse direction of conveyance is also possible then gravity assists the process to easily materialize.

The vibration frequency used is expediently chosen so high that unwanted noise and resonance phenomena within the machine are avoided will. The frequency can therefore expediently be in the ultrasonic range.

Compared to normal vibratory conveyors, where the gravity component is constantly constant remains, can with the proposed system for conveying color particles in a typewriter possibly the electrostatic holding voltage depending on the vibration

Generators 43 and 43 'supplied excitation voltage be modulated. This supports the effect of the conveying component of the acceleration forces, assuming the voltages are in the correct mutual phase relationship. In this case, it can be expedient to switch on the transmission magnet 9 or the electrostatic transmission field 9 a only for the duration of the action of the radiation 12 on the carrier 41 in a pulsed manner

13 14

which the particles on the recording surface 6 Of course, it is also possible in this case,

overlay the restrained field of rest. instead of a profiled beam for

When wandering through the recording implementation of the method, a grid-like area to use a beam of rays that is not deflected to form a character without being Deten color particles finally arrive at the above principle of the invention essentially something Ren end of the rod 41 and there are changes. To do this over the entire range of lines Suction device 44 to the circuit, d. H. which a constant level of the recorded Reservoir 2, supplied again. To ensure the typeface is, however, in this

The above for the incident according to the invention behind the deflection system additionally a drawing method proposed arrangements to switch on known compensating optics,
are primarily intended for the case that the It should finally be noted that the carrier of the recording sheet 6 is advanced in the line direction of the above-explained explanations of the. The recording system drawing system mentioned is a radiation-permeable layer of the support or a conductive layer with it, as is the case with most mechanical typewriters, while the paper trolleys that interact with such a guide, even from a machine, for example, are extremely easy to carry out, are photo-technically applied and possibly galvanically step-by-step Row direction moved. reinforced very fine grid can consist of

If, however, value is placed on the process, the meshes the radiation on the photosensitive

This can also be extended to machines that work with a layer.

If the paper holder is fixed, it is disadvantageous that the 20 Otherwise nothing will change the essence of the invention

entire recording aggregate, d. H. Changed the emitter when to increase the sensitivity

10, the stencil carrier 11 and / or others other than those effective in the recording area

Beam generating means 12, stepwise in layers of the support or a guide plate in

Move line direction. Therefore, in a manner known per se, there are still further layers,

supplement to the implementation of the method 35 z. B. semiconducting barriers od. Like., In addition

Serving devices proposed, an to the mentioned photoconductive layer are provided

Order according to fig. 8 to be provided in which the and cooperate with this.

Radiator 10 and the stencil carrier 11 fixed to the frame. In addition, it can also be provided that

are attached. As the illustration shows, with a continuous conveyance of the color

In this case, emitters laterally on the machine 30 particles through one of the carriers 4, 21, 31, 36 or

be attached so that the 41 generated by it in the recording area the time of the effective

Beams 12 parallel to the recording sheet 6 sameness of the radiation only a fraction of the time

runs and according to its profiling in the particle migration over the entire recording

Stencil carrier 11 on a recording area, d. H. about the height of a

flat inclined mirror falls. Through this mirror 35 character field makes up.

46 the bundle of rays is reversed at a right angle

steered and consequently hits perpendicularly on the endless color particle track of one of the carriers 4, 14,

In front of the recording surface arranged recording 21, 31, 36 no irregularities as a result of the

organ 47 on. The mirror 46 and the previously removed color particle areas occur

drawing organ 47 are in a write head 48 40 can, can also be provided that the dem

summarized, depending on the key recording sheet 6 associated carrier after

stop by the stepping mechanism of the machine passing the recording area in front of the new one

is moved along by the recording surface 6. Coating by known means from those for the

This arrangement has the advantage that the head does not affect the previous recording operation.

can be carried out particularly easily. He is getting rid of 45 used paint particles. The distance

therefore, without any noteworthy switching noise from these paint particles, for example, can also

Writing position to writing position movable and by suction devices or by magnetic

without annoying impact noise in the output and / or electrostatic removal devices

position resettable. be made.

1 sheet of drawings

Claims (17)

Patent claims: 1. Apparatus for the transmission of in a serial printing device, z. B. a typewriter, for the representation of characters serving color particles from a storage container on selective areas of the respective writing position of the writing sheet, the Color particles are held electrostatically by the carrier conveying them and one in the writing area photosensitive layer acting on the electrostatic field of the carrier is provided, characterized in that the color particles (3) have at least two series-connected Carriers (1, 4; 1, 14; 23, 21; 1, 31; 23, 36; 23, 41) are brought into the recording area, the surfaces of two adjacent carriers at their transmission point relative to one another move. 2. Apparatus according to claim 1, characterized in that the to promote the color particles (3) serving carriers (1, 4; 1, 14; 23, 21; 1, 31; 23, 36; 23, 41) differ from one another have corresponding conveying speeds, preferably the following in the conveying direction Carrier (4, 14, 21, 31, 36, 41) has a lower speed than the previous one (1, 23). 3. Apparatus according to claim 1 and 2, characterized in that in parallel and slightly Distance to the removal opening of a storage container (2) for paint particles (3) flat partial area of a carrier suitable for receiving these color particles (1, 23) is provided, which is attached to a second carrier (4, 21, 36, 41) at another point on its conveying surface. parallel and opposite at a small distance, and that this second carrier in turn on one other, mainly flat point of its conveying surface parallel and at a short distance is arranged opposite the recording sheet (6). 4. Device according to claims 1 to 3, characterized in that the recording sheet (6) directly associated carrier (4, 14, 21, 31, 36, 41) consists of a radiation-permeable, electrically conductive carrier body (eg 3 a, 31a) or consists of a radiation-permeable, essentially non-conductive carrier body provided with a radiation-permeable, conductive layer (eg 4b, 31b) and is also provided with a photosensitive layer on the side facing the recording sheet. 5. Device according to claims 1 to 4, characterized in that the recording sheet (6) directly associated carrier (4, 14, 31) is designed as a conveyor belt, while the carrier interacting with it either also from a conveyor belt or from a body of revolution, e.g. B. a disc (1, 23). 6. Apparatus according to claim 1, characterized in that the carrier directly associated with the recording sheet (6) consists of an insulating film tape (14) and that this tape is guided in the recording area by a tight-fitting guide member (15) consisting of a radiation-permeable, electrically conductive guide body (15a) or of a radiation-permeable, essentially non-conductive carrier body provided with a radiation-permeable, conductive layer and carrying a photosensitive layer (ISb) on the side facing the recording sheet. 7. Apparatus according to claim 4 or 6, characterized in that the optional the carrier (4, 21, 31, 36, 41) or its guide (15) provided conductive layer as primarily formed photographically and / or galvanically applied, electrically conductive grid is. 8. Device according to claims 1 to 7, characterized in that the tape-shaped carrier (4, 14, 31) directly assigned to the recording sheet (6) extends in its longitudinal extent perpendicular to the line direction ( runs. 9. Device according to claims 1 to 3, characterized in that the recording sheet (6) directly associated carrier as a body of revolution, e.g. B. as a disc (21, 36) is formed, while the second, cooperating with him carrier also consists of a Body of revolution, e.g. B. a disc (23) or a conveyor belt. 10. Apparatus according to claim 9, characterized in that the axis of the recording sheet (6) directly associated, disc-shaped carrier (21, 36) arranged at line height perpendicular to the recording surface is. 11. Device according to claims 3 to 10, characterized in that the drive of the the carrier (31, 36) directly associated with the recording surface (6) takes place discontinuously. 12. The device according to claim 11, characterized / characterized in that the drive of the up ^ - drawing sheet (6) directly associated carrier takes place essentially during the radiation pauses. 13. Apparatus according to claim 8 and 9, characterized in that the carrier (31, 36) directly associated with the recording sheet (6) is provided with tooth-shaped surfaces (31c, 36b ) which are effective for the duration of the radiation, between which transparent surfaces Surface areas (31α, 36α) are arranged which, following the irradiation, after the carrier has been advanced accordingly, make the character just transferred visible in each case. 14. Apparatus according to claim 1 and 2, characterized in that the or not directly with the recording sheet (6) interacting carrier (1, 23) from a electrical conductor, an electrical conductor coated with an insulating layer or from a consist of insulating material coated with a conductive layer. 15. Device according to claims 1 to 13, characterized in that the electrically conductive tend layers (4 c, 15 a, 31 b, 36 c) of the carriers (4, 21, 23, 31, 36, 41) are connected to a holding potential (E) via the mechanical bearing elements (5, 24). 16. The device according to claim 13, characterized in that all tooth-shaped surfaces (31c, 36b ) on one side, ie on an edge of a band-shaped carrier (31) or in the middle part of a disk-shaped carrier (36) with one another and over the bearing members (5, 22) are connected to a holding potential. 17. The device according to claim 13, characterized in that in a band-shaped Carrier (31) provides the electrical connection of the tooth-shaped surfaces (31c) on the edge that does not cover the last characters written.