DE2110697A1 - Method and apparatus for improving misprints on sheet material - Google Patents

Description

Applicant; Company VACU-BLA3T LIMITED

Title:

Method and apparatus for improving misprints on sheet material

description

The invention relates to a method for improving misprints on sheet material. But the invention also relates generally to a device with the particulate matter from a Storage container is directed to a surface to be treated.

In printing, errors often occur on printed sheet materials such as documents and the like, which generally result have that the sheet material is unusable and unusable. In some cases, a correction slip is attached to the printed article stapled or overprinted the error. But that is not a satisfactory solution to the problem. If at a limited If an error occurs in the number of printed documents or books, it is possible to correct the misprint by hand with an eraser or to rub out abrasives or cover them with a white layer and then print again. But that's a slow one costly and tiresome process. Another difficulty

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smear, which a stain of printing ink that gets onto the paper during printing, can form and which have to be removed, especially with pressure pieces hoiier Quality. It is thus an object of the invention to print from paper can be removed automatically or in a controlled manner at high speed, without significantly damaging the surface of the paper, so that the correct locations, diagrams, illustrations, etc. can print over it.

The invention provides a method of the type mentioned at the beginning, which is characterized in that a jet of particulate Abrasive on the sheet material to replace the misprint and the used abrasive is collected again after use.

The invention also consists in a device for carrying out this method, which is characterized by a device, around a jet of finely divided particulate abrasive at the sheet material, and means to recycle the used abrasive immediately after use collect. The invention then provides that the jet of abrasive is directed into a chamber which is located above the sheet material and to which suction air is connected to the Remove abrasives after use. Continues to exist the invention is that the abrasive with previously determined Speed and under predetermined 7 / inch y-uf the sheet material is directable in a jet of compressed air through an accelerating nozzle.

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= ^ ^. ORtQtNALlMSPECTED

. • ..inc * elterbiidviii: der Erdnourii 'consists in the fact that the 3inric ¹ it n / r between - straightening of ochxei i / means in ei η a 3tra.nl of air aroundi'iiι? T a storage container for the abrasive, the left below by means of a porous ο cn. ei be and above with * eis einij i'üllstöp-3 ·: -ΐ3 vorcc-loosen, a chamber under the porous o-disk, which can be operated with compressed air ν ri II υπ! 't el -T ^ e. "durc. de :, bpeic'ier bemilter and errant Oberh.v Ib der v-or -'- se»: disc, di.e: .. ui'". eiser. a harvest Zylirdor, ■; <;. r · -. · - ciiH'V. ..nEach n.it one; rveiten Lui'tayl .nJer connected to the cir.e. '. koJ Lf-r: jjt i; iiicr coaxial: 2U. ·. ür.iten £ .A ⁷ linäer ei ^ -eci-dneteii i-voi ■.-ii! s:. ·; "■,." e has a coaxial -o-.r: r: i _: - in the. the ii-.eiier: _..ylinder:: egenÜberliefern s cylinder into which the j ^ hands of kolb'-nGtaiiiie eiarreiien can order the latter to vere.M. iieiren, tine radi -.- le. ;;: dun _r : in de :: first cylinder, through the öch eif- - *. it.tel from! e .: v; pe-icherceaalter in l «n first .η Lylinier :: re: en k-. rr,. -inen duct for the passage of i.uft von Tem ex'sten cylinder in aen oi eic .erbehält cberhalc des liiveaud de: = · therein ii.ff ii '"d_iciiei: üchleifmi *. tels, Kanaleinrict ^ nf en with valves that : γμ ' ent ire.'en- "e-. ^{: the} last one. Pages of the column :: s cLz "; etn sw e it er. Air cylinders are vez'D, υπ the valve to open and close, iina 5ie nozzle, which via r.analr.ittel with; he koaxir .len DC: ir -ig of the most cylinders.

The inventor then provides that the direction to the top by 3chieifir.itt-el ucfaiit den brought into an .. air jet Stored: .ulter for the ochieifr. Means that down through iie porous Disk and ofcei: durci: the lid is closed, die Kar.;, er n.it der c orb's en ocheibe, die ar. iie j ^ ruck source en-

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can be closed, canal means that can be connected to a pressure source, which run above the porous disk through the storage container and have a restrictive ignition coaxial in the duct, the / "fester!" opening in the wall of the canal, through the Abrasive from the storage container in the Kf-.nal arrives, and the nozzle connected to the outlet of the duct.

It is expediently provided that the nozzle in the box-like Chamber is arranged and this has a bottom plate with an opening through which the jet of abrasive Kar.n, which is arranged close to and under the base plate of the chamber, hit the oil.

It is advantageous if an air-permeable ring-shaped seal around the un under the opening in the base plate of the Kaffrrer is arranged.

A refinement of the invention provides, Ger the Karrmer is provided at opposite sides with slots, one of which is opened to the atmosphere and the other to a cooling fan of a t Staubsarr.irlereinheJ be connected.

Furthermore, it is useful if the device can be moved easily is positioned with respect to the sheet material so that the jet of abrasive is directed to the desired location on the sheet material is accessible.

In the drawing, a number of exemplary

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Forms of the invention illustrated and shows

i? ig. 1, 2 and 3 each schematically and in cross section one of '' three devices to improve misprints,

Fig. 4 is a plan view of a complete improvement device of misprinting with a storage tank and a blower chamber,

Pig. 5 shows a side view of the device according to FIG. 4, FIG. 6 shows a rear view of the device according to FIG.

7 shows in detail a section through the storage container the blower chamber according to Fig. 4 and

FIG. 8 shows in detail a section through a storage container and a blower chamber in a different embodiment than in FIG. 7th

According to Fig. 1 to 3, the particulate material is directed at a limited angle to the paper on the paper A, either by it is transported in a stream B of compressed air through a nozzle C, or by centrifugal force by means of a multi-vane wheel D is directed to which the particulate material is fed. Immediately after-the particulate matter on the paper is struck, it is removed by suction. That can be achieved by means of a collecting ring E which tightly surrounds the accelerating nozzle, as shown in FIG. 1, by means of a special collection nozzle F placed close to and at an angle to the accelerating nozzle or the multi-vane wheel ict, as Fig. 2 shows, or by means of a viewing chamber G, in which the accelerating nozzle or the multi-vane wheel is arranged and through which a collecting air flow is passed, such as

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ÖfttölNAL INSPECTED

it 1 ' ¹ Ig. 3 shows.

■ If the collecting ring is used, which accelerates the nozzle surrounds an air-permeable rim: I the Sarr.melring against seal the paper to be treated. This hung can be made from tufts of hair or permeable plastic etc. and prevents the escape of particulate matter into the surrounding atmosphere, allowing air to be drawn into the ring.

angular alumina, silicon carbide, etc. are among the abrasives useful as particulate material, although the invention is in no way limited to the use of these substances. The suitable size range for the abrasive is between 6-16 microns and 19-47 microns, ie sizes 600 and 320. The abrasive is aimed at the paper at an angle of 90 ° to 15 ° to the plane of the paper by means of compressed air from a pressure of preferably 703 to 3,515 g / cm (correct: 10 to 50 lbs / square inch) or it is centrifugally thrown away by means of a propeller. It has been found that the more acute the angle to the plane of the paper, the faster the pressure is removed, although there is a risk that the surface of certain types of paper will be more susceptible to damage if the angle at which the abrasive is directed is is extremely pointed. It has been found that it is possible under Verv. grounding of 400 britdoBsh aluminum powder, which is directed at an angle of tO to 50 on the surface, black print of high-

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211Ö697

High-quality coated paper nitte-ls compressed air of 2,109 gr / cm (correct: 3 G Ibs / squnre inch) inr ^; rhulb from 2 to 3 seconds to eu'.i'ernen, V. if large areas of pressure have to be removed, aarir: v.erial means provided for the means for hurling the bchiei / K-it teiu and move the suction nozzles over the paper.

i.-Orrnnlerv / eise sees the device or machine for carrying out the method according to the invention from Littein, in order to transport sheets of paper or the like individually onto a flat surface, as is customary in printing, after which the grinding! It is directed towards the paper sheet from a fixed or leased source. In the latter. In this case, the ae wei-un.-sgfsjhvi.idi ^ .Kci-f "of the abrasive over the paper surface can be up to 30.4 · - 'm / min, although a speed of - 04b .is 9» 144 m / min, is usually suitable.

On the other hand, it may be necessary ei ^{Λ βη} small r'leck ._ur correction i u remove. This can be easily achieved INAEM blow ur.d oainmelmittel to .a arm be mounted, which pushed and lowered onto the paper can in order to a spot z \ i bl'-sen. The sheets can be stacked in a stack, the top sheet being removed after each ileck-Elas operation, or the sheets are sniffed into position between each ileck-Elas operation against a registration device.

In .ien cases where an accelerating nozzle is used the hole can be as small as e.g. 0.25 mm, to reach a small pale trail. Vr'enn a big 3-eclsse-

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If current is generated, such as with centrifugal acceleration of the particles, a template Y (Fig. 3) made of rubber, steel or other suitable material can be used to restrict the area at which the particle material is directed.

When the misprint is removed, the paper can be properly overprinted. This can be done on a special machine. But with ongoing applications, the print removal ' and overprint operations are more conveniently performed sequentially on the same machine by switching paper feed, the application of particulate matter and the overpressure process are synchronized so that there is sufficient time for removal of the misprint 'is available.

Another embodiment is shown in FIGS. 5, 6 and 7, respectively
from a storage container 1 in which particulate material 2 is stored. Below the storage container there is a feed valve 3 which meters a controlled amount of particulate material into an air stream which is conveyed along a blower hose 4, which is made of rubber, plastic or similar flexible material, and a nozzle 5. The nozzle 5
accelerates the flow of air and particulate matter and directs it as a concentrated jet 6 onto a sheet of material 7,
d & s is to be treated. In order to obtain a very small jet for the correction of a single flaw, the bore of the nozzle can be as small as 0.25 mm, for example.

The nozzle 5 is arranged within a chamber 8 to the

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Jet of air and ochleifmit: el to get back and to prevent dai? it spreads out next to the particular area to be treated. An outlet line 9 is connected to the chamber and consists, for example, of a circular or rectangular pipe with a transition pipe piece 10 which connects a Sarr.melschlitz 11 over the side of the ivar; u, it. The Auslaisieituiig 9 is connected to a riaugiuitstroui to collect particulate matter and abrasion from the Ki.mmer. An advantageous alternative is to connect a sub-fan (not shown) to the inde of the outlet line by means of a flexible (Jj ¹ Ig. 4) vacuum hose 12. On the side of the chamber opposite the collecting slot, an access slot 13 is provided, causing a high velocity air stream to pass over the bottom of the chamber to remove the particulate material immediately after the impact on the sheet material.

The storage container 1 is at its upper iinde with a quick-acting jj'üllstöpsel 14 provided to fill up particulate matter to be able to. Below the storage container there is a cap 15, which is a porous disc 16 made of ceramic or sintered Bronze etc., which contains a lower floor of the storage container forms. The porosity of the disk must be such that the air can pass through the disk, but particulate matter is prevented from passing. Move horizontally through the storage tank There is a extending through above the porous layer Supply pipe 17 is provided which has a stepped bore 18. In the narrower (exit-side) ßohrungsbereich is the blower hose 4 fitted, which by means of a Druck.ri.n-

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ges 19 is set, so that the Sc-laucrer.de rerade into the larger (inlet-side) bore area rr- "t. The inlet-.rj.-side end of the supply pipe 17 is ¹ " rr.it a: Adaptation tube piece 20 connected, ah which in turn an air cylinder ^ -r 21 f-.a ~ ^ - is closed. A piston rod 22 one in de β ^ ur'tz ;. lirder piston has a strange odor poor rrror ::. tes ^ n- de and is of such length that it, vienn them full -.us. is stretched, she ;: sealed the ancle aes Crecläiiesschlauch '-. s

4 sets.

In operation, the compressed air is pressurized zo is passed through a hose 23 üoer the porous disc 26 in the storage container 1. Iv.it compressed air vird a -.inten & r air cylinder 21 supplied located Scnlaucn 24 - ird the piston rod 22 is extended to the line of the seal Gecläseschiauches 4 so that no air can flow from the storage tank. When the Sc .-. Lauch 24 is exhausted ujvI a front hose 25 of the air cylinder is pressurized int, pulls the piston rod back and air flows from the Jο-iche 'container through a hose 26 via aas Zui'unrrohr 1 ί, the Blower hose 4 and finally through the blower 5. This results in a vertical air flow through the spreader container, which makes the very fine particle material, which is for example 10 microns small, flowing and causes the particle material to flow freely. The extent to which the flow rate is achieved is controlled by the vertical air flow that flows through the bore of the nozzle

5 is limited. The lorosity of the disk 16 and the dimensions of the storage container 1 can also be set,

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to vary the flowability. A mouth 27 that is somewhere can be arranged around the wall of the supply pipe 17, allows the toilet material to flow into the supply pipe, so that it enters the air stream and is accelerated by the nozzle 5.

The size of the mouth 27 is chosen so that a correct flow of Teilcl ^ enmaterial is guaranteed and when the Piston rod 22 and touching the blower hose 4, the air and particle material flow suddenly stops. Conversely, if the storage container is arranged near the chamber, then the length of the blower hose 4 is minimal. When the piston rod is withdrawn, then the flow of air and particulate matter through the nozzle occurs essentially instantaneously without that it suddenly increases due to excess abrasive, which lies in the blower hose 4. It is important that the piston rod, when it has retracted, is well off the muzzle 27 is removed, so that a grinding of the piston rod through Particulate matter is avoided.

The blower hose and the nozzle 5 are expediently in the chamber within a tubular holder 28 and arranged to place abrasives at a suitable angle direct the paper material through an opening 29 in the bottom plate 30 of the chamber. In many cases this is a removal of misprints it is desirable to reduce the abrading effect to a very small one Restrict area. For this purpose, the holder 28 is fastened in such a way that it receives particulate material through a very small opening 31 of a Template 32 aligns, which is made of abrasion-resistant guu: mi or art

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substance is made. The stencil can easily be replaced in adaptation to the area to be treated and is in its position from a simple bracket 33 held.

When it is desired to remove more than a single stain from the sheet material, the holder 28 becomes movable stored, e.g. in a rubber transverse wall 34. This allows the nozzle 5 to pass through a large area around its central position Actuation of a handle 35 are directed. There is a viewing window on the top of the chamber for all modes of operation 36 provided in order to be able to estimate the erasing effect easily.

In operation, the bottom plate 30 can be placed directly on the sheet material 7 when particulate material is through the nozzle
is judged. With such an arrangement dust from the erasing activity can also penetrate in places between the base plate and the sheet material around the opening 29, although this is normally not harmful for the subsequent correction. However, if the seal 37 made of air-permeable material such as felt around the Cffnuns; intended
buft is drawn into the chamber in places to remove the dust, although the particulate material cannot escape from the chamber. The air access slot 13 can then
can be reduced in area or completely removed, so that the air as a whole enters through the opening 29.

Another embodiment of the invention shown in FIG

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ORWilNAL INSPECTED

consists of a storage container 58 in which there are particles; aterial 59 is located. In the:. Storage tank is a supply valve 60 provided that a controlled Ivenge of particle material ir. An air flow from ^ i-it, by means of which it along ei nem Ge blown hose 61 made of rubber, plastic or the like flexible material and transported through a nozzle 62 will. This accelerates the flow of air and particulate matter and directs it as a concentrated beam 63 against a sheet of material 64 to be treated.

The nozzle 62 is disposed within a chamber 88 that t the flow of air and ocnleifmittel on nium and ver .- inthe L that he about to be treated "J ^l. In addition, the distributed cozy Kamrer is a Auslai31eitung?. 65, which consists, for example, of a round or rectangular pipe with a transition pipe piece 66, wherein: a 3am 1-slot 67 is formed over the front side of the chamber. The outlet line 65 is connected to an exhaust air flow to remove particulate matter and dust An advantageous possibility consists in connecting a dust collection ventilator, not shown, to the end of the outlet line 65 by means of a flexible vacuum hose, for example 12 in FIG which allows the air flow to enter at a rate sufficient to prevent the escape of particulate material, thereby causing the particulate material to immediately after impacting the sheet material e is removed. The opening 68 also serves as a viewing opening, so that the effect of the impact of the grinding

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by means of who can be observed.

The storage container 5ö is provided with a jT.ilikapps 69 at the top so that it can be loaded with parts: su kü ^ r.en. , "-. r. the bottom side of the storage tank becomes a porous" Jo hoi be '-'O made of ceramic, sintered bronze etc.,: .ii ^f : .tels bolts -jcier ^ hr.iic'-e devices against a Dicr.tdng 71 ^! ius juarri o.A. teri -: - l held. The porosity of the disc is such that nft. ■ can flow through the pane, but T material cannot tear. They extend horizontally through the jp ^ ic häiter - just above the r.orcsen ocneit- a feed pipe 72 and the blower hose 61. Lie.e sir.-χ by means of iViUttern 73 and flexible rings 74 in inner 3 tellur; - üest-ehhl th so that an escape of xeiic ^ enrtaterie j. ν r · Indian. is. Between the supply tube 72 and the ^Gedl: 61 iseschlauch the Zufuurventil is fitted 60 which is an opening f-7 ^r> Mifv /, us the flow of air along the supply pipe 72 to control ability. In another pipe 76, having an opening 77, causes particulate matter to flow from the storage container 08 in a controlled amount into the pipe 76 and along the conduit 61 to the nozzle 62 where it is accelerated and is directed at the sheet material.

During operation, compressed air is in a controlled iviafie so sent through a κ ear 78 that it passes through the porous Disk 70 passes through and the particle material 5 °) makes flowable. The particulate matter then becomes unwilling flow through the opening 77 when compressed air enters the Uufunr-

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pipe 72 is sent and flows through the supply valve 60. and the geclase hose 61. To prevent the flow of air by pressurizing the storage container through the porous disk, a hose 87 feeds from one above the surface of the The same material located point of the storage container in the g 65.

The opening 77 can be arranged anywhere around the feed valve 60 and is selected in size so that a correct flow of particulate material is achieved.

As in i''ig. 7 shown, the blower hose 61 can be rigid of the chamber 88 so as to direct a jet of particulate material at an appropriate angle onto the sheet material through an opening 79 in the bottom plate oO of the chamber. As already described above, a Template 81 can be provided, which is held in position by means of a tab 82 and has an opening or mouth 83, about the effect of the blower jet on the paper on a specific one Restrict area.

The nozzle can of course be manipulated by hand,

to be directed over the ranze surface of the opening 79, wherein it is readily observable through the upper opening 68. ? / can, as already described above, An air-permeable seal 84 may be attached to the bottom of the chamber around the opening to prevent dust or dust from escaping Particulate matter on the surface of the sheet material

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prevent. It has been found that by shaping the front edge of the rear wall as shown at 85 and removing the seal across the front edge of the opening, some of the air drawn through the plenum slot 67 will enter through the bottom guard 86 and can more effectively dust and particulate material from your sheet material sweep k ^r: nn.

The in E ¹ Ig. The device shown in FIG. 8 can generally be used as a grinding smock blower, for example for the industrial cleaning of parts. It can be used with or without a closing chamber.

Around the nominal material on each sheet of sheet material 7 or 64, i -: -: t it is essential that the It can easily be moved over the sheet material a "jcr. must be fixed in a predetermined position, if a batch of sheets to correct: is. If every patient is then brought to the treatment center, it will be done every time the same area for an improvement erased, '. -rlei'jhzeit it is desirable that the canisters should be able to be healed from ßlr-ttrnmaterial is to remove the treated sheet and a new one Insert sheet. Finally, urr, to simplify the operation: en, the control of the particle matter stream automatically done by lowering the K & :. ir:, er onto the sheet material. This requirement can be achieved in various ways will. A suitable facility is shown and works fox as follows:

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Around the outlet line 9 there is a lower guide tube 38 made of Uylon (entered Wz) or a similar friction unit Material consists, and rolls 40 arranged. These are so arranged that the guide tube slides freely over the outlet line but has a minimum of sideways mobility. the Chamber can be moved so that it fully covers the sheet material is enough, and can be determined in this position by means of the screw 41, which is on the outlet line on the attacks the lower guide tube.

At the top of the lower guide tube is opposite this rotated by 90 °, an upper guide tube 42 is rigidly attached, which is in a similar manner with lateral guides 43 and Rollers 44 is provided. This moves over a transverse rod or a transverse tube 45, the one Has a length sufficient for the chamber 8 to fully cross the width of the sheet material. The upper guide tube can be determined by means of a screw 46 which engages the transverse pipe.

The ends of the transverse tube are in two laterally arranged ball bearings 47, which are attached to vertical end plates 48 of a base frame 49. This can rotate the transverse tube about its longitudinal axis, thereby lifting the chamber off or onto the sheet material is lowered. A crank arm 50 is attached to one end of the transverse tube, which by means of a pin 51 is attached to a fork 52. The fork is attached to

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the piston rod of an air cylinder 53 »which in turn is attached to a Trunnion 54 is attached. When compressed air is now supplied to a lower connecting line 55, the piston rod extends, the transversely extending tube 45 rotates and offsets the chamber from the BMtrnmaterial. Conversely, the Kaciner lowers itself in tight contact with the sheet material when pressurized air is supplied to an '56 top connecting line.

It's a simple thing to move the board and the To coordinate the flow of particulate material by means of a pneumatic or a JP electropneumatic control device in such a way that to the following with reference to Fir. 7 described To obtain operating sequence. We: η the control device is switched on, then Drueklu / t gets into the hoses 23, 24 and 55. This pressurizes the storage tank and closes the supply valve 3 to prevent any flow to prevent air and particulate matter through the nozzle 5. At the same time, the chamber is lifted from the sheet material. By loosening the screws 41 and 46, the chamber can be split into two Directions are moved so that the beam of Jjuft and ■ particle material, when the chamber is lowered, each selected area of the sheet material 7 is erased. It can be a foot operated Control valve can be provided to relieve the hose 55 from pressure and the hose 56 under pressure set and after a set period of time to remove the pressure from the hose 24 and the hose 25 under pressure to put. This will lower the chamber onto the sheet material, causing a flow of air and particulate matter through

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• - 1Q -

the nozzle 5 occurs. Conversely, if the foot-operated control valve is no longer operated, the air cylinder 21 will first streak to stop the blower jet, and after a set period of time the air cylinder 53 will live in the chamber of the sheet material 7. It is therefore only necessary to provide an author from JlattKOte.- ial between the actuations of the foot-operated valve in order to remove a misprinted area from a stack of sheets. Because j he -Jaugkraft, which is applied to the chamber to the particle ^ Ateria] recover, h; .. the sheet material t is the Jrtei- fu r to d v-r Kml; snag .he 'when raised dieae will. The camera wonder: · ... earth with a retractable piston 57, which is arranged on the third side of the chamber and the base plate 30 protrudes over a short distance below.

although the foregoing is just one system for practicing the invention describes, many changes are possible without from To give way to the basic principle of the invention. Typical examples such .-. nd rounds are:

a: With rich lever storage and conversion equipment, it came to be like it is shown in rir. e:. flow of air and aterial along de: air blower hose 4 from a non-pressurized storage container: to generate it ¹ in a similar "t.eise ri.it deceleratoru>: ~ controlled how it

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for the control of the supply valve air cylinder 21 described. ben is. The flowing air that is admitted via the pipe 78 would always take effect when the control • facility is switched on "

b) In the device shown, the recovery fluid transports the particulate matter and dust to a 3taubsamtfiler-fan unit, where it can be separately recovered and reused. The recovery line can be connected to a recovery unit which is arranged above the storage container 1 or 58. Through this it becomes possible to store the recovered particulate material ready for reuse, using a transition valve is provided between the recovery unit and the storage container.

c) The tubular nozzle holder 28 can be mechanically operated, to cover a large area of the sheet material in the chamber 8. On the other hand, by controlling the pressure the chamber on the sheet material, the chamber automatically the sheet material can be moved to cover a larger area erase than is otherwise possible.

d) As an alternative to the rigidly mounted to the chamber ^ ru · the chamber may be fitted with a counterweight hinged arm and the end, wherein the i-.uslaßleitung 9 is entirely formed as a flexible hose.

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OWQINAL INSPECTED

It goes without saying that the foregoing description is only exemplary and that Jünzelneiten for Aucfi the i'Jrxindun "· can be changed without being affected by the beansr; ruchten to give way to üriridim ^ s thoughts.

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Claims (10)

- 99 - Ia tent claims Γ 1 .J method for "Verbesaern von iTenidruck auf / ^ :. tt.? .. teri ^ i, characterized in that dai; an otranl of parts er.i'ör. '.'. Abrasive on the sheet · aterial to -ie., share it: · pressure is directed and the used abrasive ri ^ c brow bodice · el is. 2. Voi'x-ichtung for the implementation of the 'procedure η er ..rispruc! -. 1, characterized by a ^ iririctung, ui :. eiri -.- i,; JlranL (6) of finely divided tei_chenföraiii; en ocnleiimit: el to prepare the sheet material (7), and a ^ irricntunp- to collect the used abrasive immediately after georauch. 3. Apparatus according to claim 2, characterized in that the jet (6) of abrasive is directed into a chamber (8) which is arranged above the sheet material (7) and is connected to the suction air in order to restore the abrasive after use remove. 4. Apparatus according to claim 2 or 3, characterized in that the abrasive can be directed at a predetermined speed and at a predetermined angle to the BIa ttnu-'terial (7) in a jet (6) of compressed air through an accelerating nozzle (5). 5. Apparatus according to claim 2, 3 or 4 » characterized by yekennzeich- 109841/0186 - 23 - net that the device for directing abrasive in a jet (6) of air comprises a storage container (1) for the abrasive, which is closed at the bottom and by means of a porous disc (16) and at the top by means of a filling plug (14), a Chamber below the porous disc, which can be connected to a compressed air source, air-actuated valve means across the storage container and just above the Lorosen disc, which have a first cylinder which is connected at one end to a second air cylinder (22) which has a piston a piston rod (22) arranged coaxially with the first cylinder, a coaxial bore in the; derr. cylinder opposite to the second cylinder, in which the end of the piston rod can engage to close the latter, a radial opening (27) in the first cylinder, durci: the abrasives from the storage container into the first cylinder: «.ann, a channel for the passage of jjuft from the first cylinder into the storage container above the level of the abrasive contained therein, t \ an si devices with valves which are connected to the second air cylinder (21) on opposite sides of the piston ii to open the valve: un? to close, and the nozzle (5), which is connected via channel means with the coaxial bore of the first cylinder. 6, Yoi-direction according to Claim 2, characterized in that the device for directing grinding means brought into an air jet (6) comprises the storage container (1) for _f the tail:;. ittel, the bottom through the porous disc (16) 109841/0186 - 24 - and at the top through the iüllstöpsel (14) ab ^ enchlos.r-en, the chamber under the porous disk, which? .. ι · ι the pressure source can be connected, to a JJrucklui'tquelie hriXchLiai b-re him al - medium, which extend above the porous older ocheibe by the opeicher- bo and a ¹ s ^ n T ¹ -; eide ^ lindun? koi.xlal in the canal, the further jüündu '' - ¹ '- (27) in the vVandun? "of the canal, through the och. eifnittel voir 3rei-:'^; · er-i ' ^! -.' lt <- -r in the: channel irelano-t, and the sv. den kJul ^ Q des r.analf;? in? 'escnIosseine nozzle (5). 7. VorriC'.tun ^ according to one of claims 2 Lis 6, characterized in that the nozzle (5) in the ^ cir "". Chtely ■ ;: borrowed chamber: ·· (8) is arranged and the.; E eir ^ e bottom plate (30) having a uffnu ·:;.?, having · "(29) through which the beam (6) ßlüttm of abrasive on the Toriel may take (7), which close oei ur.3 u ^v ter the liodenplatre the ivar-r ^ he Toggle is ordered. 8. Vorricr.t '/ · .., / rif-c /. j-.nspriich 7, d-By J /: ennzeichnet ge k, as> a Iui ^{- t:::} s-; \. ^; lssi; - e rzi.qf <'rx' i; - e! .io. t - ^ - r * 37; r ^ - ·· u: r. the ur.d vr: ter of the ti-'only:' (29) in 6 r ; o; R> r \ .n · te Ow der Ke ser (^) ä-.-Eord'.e '. i. ·; * -. 9.. jj.-ric - "-" ^ nn: c. "a 'jer ... rsj.r'Jc -.''- -; .- ir; · ;, κ.-";rc'-', - ej-: °: nzeic.-re t , da .. · die Kerr.-.er (8j ar: ei ^r .; v .. er, - R? en "oer ■ ie -.-- γ · π -? «Γ oeiten -:. ·. Slitzer. (11, 15, v-rcet.er ist, vo:;" - ilen eirer:; ar: ■ _ * .'osph-ire :: i. ^K - e ^ '': ne \ int ur. \ a the other at ei: .er Yen *:! "'or one; * g''! E ^ ::.: jer'^; .: /; - j /. · ./.-ichlit - .Vbar 109841/0186 - ^ = 5 - SAD ORfQINAL int. 10. vorrici.tu-'u · -i.cn. ^ Rusendung 2, ck-durcJa .- 'eke.nnzeichr.et that it is easy; btv / ei-'b- r arranged with respect to the sheet material ii-t ,, so dijG the jet of abrasive is directed towards the er-V; 'with the steepest parts of the sheet material. 109841/0186