DE1597793A1 - Process for the production of offset printing plates - Google Patents

Description

ve # u iel v V "asaerierter crt 12 1 ni a ', ele hal eh - cht A ei 13 ic 1 i e Lup u 1 o 7, adem eie B ' ek al w »b L wobul is the value of the # c electrode # .3 'PanAing of the metal layer and / or dle duration of de-i, - T-.mpulse Depending on the signals irgodu.1, -1art, the duroh Xn-derunEon of the scanning, on the Dukunient to be re-produced, exposed ray bundles the can d "# t # -i." th and v, w3 & achen der auf, B, The ee # vz EI2-k; 4 "iT, -c-de ej-.ije ## die. d'exe iL.P raprt, duuierandei # the nrid your eln kv-% ez # 3.ie u,., id and Dec e *. # Z-3 ## -! -, ha-, at, #n -n it.- In the pürmi one Plate, the metal layer of which is destroyed point by point was, modüvdh the substrate is exposed. Before i "iF.n z., Eggie thread-shaped 'die kontinut-erli, -, 11 practiced the job is moved, so that the Blektrodeg is connected to it the electrical energy is consumed., bedridden renewed and kept clean, "7.4", d. -If you have., As a base cA.ne .1% »1: (3t ..- # du7." used that for all unfamiliar Process can be reproduced. to chIlded Is'- he 'lndu:,., Grs ge # miKf, - through i for the cu D-ulturnent, e: «Lr" c E.41. Direction to the system iaid fst-k #; 1- # aLziven -qj.! j, 2 * e C.1: ineE i ». #. üi -.;,. li # Inde114, one with des Dok # .1m3rit # s, which is a thread- and a pre- of an Otent'tal to the a1Z3 there! # der : i.v't7 unA desgen value and / or duration can be modulated as a function of the analysis and transformation of the light signals generated by the light beam scanning of the document.

In an advantageous embodiment of the invention, there is the electrode from a notalltaden or tape that-or. the upper part of a well-pointed rod holder is moved continuously.

An embodiment of the invention is explained in more detail with the aid of the drawings. The figures show: FIG. 1 an exhaustion-free arrangement, FIG. 2 is a perspective view of the in Ylg. Arrangement shown 1, Fig. 3 in an enlarged Naästab a cross section through part of the arrangement of Fig. 19 Fig. 4 In a still larger scale a detail of Fig. 39 is a cross-sectional of FIG. 4 inclined Unselheitlo Vig. 6 a perspective view of the Abtaotoiwiohtvfflp Ylg. 7 a detail of the pig. 63, 8 shows a block diagram of the arrangement according to the invention. Vig. 9. The In de * block diagram deit The In Pig. 1 shown arrangement are used to produce from Kll% otieeA out of a photographic document. > V.1 like " arrangement belongs to a phato- 1 that is on a pillar 2 be, # iegb & i, Lat and in das3 wan that to reproduce decorative doctorate -inserts, you do that of traditional construction type "creates an image to & In Clar gewünse.b.fen Oi. "Sse deu cliché, # i. Ylg. 2) denotes di-uh parallel to 1 e # 1 generated figure in two M. Directions. To this point 1 en 5 $ 6 attached-! "That themselves - Moved to the vertical direction The controls for moving the carriage and slide bars are in Pig. 6 and 7 shown.-The two Oleitstangen 5, 6 are firmly connected at their ends with a support 51 so that they can slide along two parallel rods 52, 53. The two rods 529 53 are connected to a rigid frame 54 feet and run perpendicular to the two Gleitatangen 5, 6. Der the Support 51 is along / both rods 52e 53 by one electric motor 56 moves, which drives a spindle 57 , the nut 58 attached to the carrier 51 in elner runs. The spindle 57 is rotatably mounted in the frame 51 at both of its ends. Corresponding to the direction of rotation of the motor 56 , the carrier 51 and thus the slide rods 5 and 6 move in the Y direction or in the opposite direction.

The movements of the carriage 4 on the slide rods are brought about by an electric motor 61 which is attached to the carrier 51 and whose shaft carries a drum 62. A rope 639 runs on the sell drum 62 and is guided by pulleys 64: 65-, 66, 67 mounted on the carrier 51 . The two ends of the rope are 2, as indicated at 71 and 72, attached to the two ends of the side arm 4. Corresponding to the direction of rotation of the motor 61, the slide moves on its slide rods in direction XI or x2.

For a given position of the Gleitstangei53 6 sleeps is itten 4 in the direction of the arrow Xi along the slide bars moved forward step by step. As soon as it has reached the end of its path, the slide rods 5, 6 are shifted by one step in the direction of the arrow Y, whereupon the carriage 4, again step by step, on its slide rods 5, 6 in the opposite direction in the direction of the Arrow X2). When it has reached the end of its path ,, # the slide rods 5, 6 are again moved one step in the direction of arrow Y. and the carriage 4 moves again, along its slide rods,, step by step in the direction the arrow Xl. the movement of the carriage 4, the entire surface of the photographic magnification is shown the ichiittene near the UhelfIRche systematically the Echlitten moves on its slide rods s. B., mean at cNER üeschwindigkeit of lo cm / lake .

The dwell time of the slide is a few fractions of a second less than the time necessary to fix the slide, but which is longer and a few milliseconds. In this example, the solution for forming is about To lines per am.

The scanned point of the photographic enlargement 21 is realized by a window / (Fig. 2) that in the surface of the carriage 4 is provided and above which there is a vibrating leaf 12 -befindetg whose frequency z. B. 65o Nz-, is.

Parallel to the image plane of the photographic enlargement and the systematic scanning movement of the carriage is a preferably translucent base 13 (e.g. made of acetate, polyenter or polyvinyl), which is covered on its surface with a thin metallic layer 14 (e.g. made of silver, copper , Nickel or 3.umlnium) with a thickness of the order of 0.15 ig is docked. This metal layer is at the Banis potential through lateral contacts 16. an electrical supply system 18 connected.

The gravitation device consists of a thread-like electrode 21 which moves continuously on a pointed electrode carrier 22 (FIGS. 4 and 5). which in the exemplary embodiment is shaped like a cutting edge and at an acute angle. This emergency electrode consists of x. B. from a thin one Metallbwid or thread with a diameter of "a4" Magnitude of Vlo m. Der Notalltaden (or das Netail tape is unwound from a supply roll 24 » runs over guide rollers 259 269 27p 283, slides on your electrode carrier 22, around the tip of which he air " is guided by Unlon rollers 31, 329 339 34 and winds up on a receptacle 35 . The roles 24 and 35 have been used by electrical notors like this 9 because the thread is constantly taut. The lead electrode carrier 22 mechanism is mounted on the slide 4. The electrode carrier 22 consists, for. au * one leaning material and the Schlitteri.4 is located, # nlöh regarding / underlay 13 at an equal height, yourself di . o filiform electrode 21 Vit the metal slide of the pad is in radio tube. whereby, by gently pressing the lead trigger 22 *, the lead electrode is accurately guided between the lead carrier and the emergency bag.

An increased potential is applied to the tad-shaped electrode 21 by an electrical sensor system 18 via a conductor 419 with the axes of the wire, which is made of metal, for guiding the electrode serving fflun rollers 27 and 32 electrically. is bound. The bundle of light from the scanned photographic images Enlargement penetrates through the yo »ttr 11, -you one Igollimtor, wilt the surface of s. 3. o # I m2 forms, and arrives at an objective 43 and a deflection device 44, which sends the bundle of light to a photographic electrical should 45 forwards. The light spot of $ 0 on the photoelectric should meets » is in elektrItehe t» ng * w »Mlt, 9 dewo Changes the Xnderungen of the LiehtInteneItät reproduce scanning light bundles. An electronic one Device, which will be described below, tranntor- ed tHe modulations in light intensity In modulations the electrical potential &, which is passed through the conductor 41 has been transferred to the thread-like electrode 21. The working wines of the arrangement according to the invention is with follows: The photographic document (e.g. slide or Negative) from which the cliché is to be made, is inserted into the pre-enlarger 1 , the one of which a very hard image in which the "rUe" produces the attached clichés in the plane which is scanned by the penster 11 of the carriage * 4. While the slide effects the syntenatic scanning of the magnification in the manner given above, the Libbttleok tangled in the objective 43 is guided by the U * 4 * nk device 44 to the photoelectric cell 45, through whose modulated excitation the taden-shaped electrode is placed over an electronic device is supplied with correspondingly modulated electrical energy. The split 12 is used for »that of. to randomize the light picked up by the photoelectric cell in such a way that the current emitted by the cell is itself modulated. Thus, the signal can be properly amplified. A demodulator synchronized to the frequency of the plate then demodulates the signal. The modulation frequency of the lights here corresponds to the downstep; However, that is not absolutely necessary: Lich.

In the case of the iris, an eye-catching embodiment of the invention "n" g '. in which the thread-like electrode is in direct contact with the metal layer 14 of the base 13 , a local heating occurs at the contact point between the electrode and the metal layer due to the Juliettekt, which severely destroyed the emergency layer and was at a voltage in the order of magnitude of 1 to 20 volts and an output of ogl to o35 watts. The modulation of the energy and / or the duration of the impulses projecting onto the electrode 6b ffl thus cause a modulated destruction of the emergency layer, as a result of which the photographic document is reproduced on the cliché.

One could regulate the strength of the reproduction by metering the intensity and the duration of the pulse.

The electronic device will now be described in accordance with. From a «Poto.t» r @ t4rker 81 (Fig. 8) 9 of the Liehteignale in electrical quantities ttbertrteo these quantities get to a Spolcherschaltung 82.die -the word the electrical impulse "a. Which with a Lieht. Excitation on the The anode of the photometallic device appears for a certain time that is sufficient for sampling in the sequence of steps.

Shower the Gamu-Veretärker 83 can "trap 'Jerforderlioh, the electrical input quantities reduced and Inverttert. It is necessary, in fact," the big Kontrute to reduce s. As a slide to acceptable for the Papierdruok differences, which in stage 84 he follows. Through special regulations " which affect the response characteristics of the Gaica amplifier and the full shape of the sawtooth generator 86 , the contrasts of the object to be reproduced can either be changed overall or selectively depending on certain optical densities.

These special measures make it possible to improve or change the quality of a reproduction in very large proportions and thus to achieve the desired effect.

A signal is available at the output of the circuit (Fig. 9a1, which can be corrected and changed at the discretion of the Bedlenungamann; these continuous voltages are compared at 87 with a linear sawtooth, the value of which is of opposite polarity (Fig. 9b). the Kulldurch gear to the algebraic sum of (a + b) bestimt overturning the comparator (Fig. 90, whereby the trigger 88 is turned on, the (between ti and t2, a signal Fig. emits 9d)., which via a pulse generator 89, the Electrode 21 feeds.

The clock oscillator 92 fulfills several functions, the main one of which is the frequency the pw * te (about, 650, ft t, "o To ftu""Per m bet one genchwindia »it vcm Uno second rmutco boots to dw% WO of the saw tooth generator 869 the chipwffl tIr 34 to 14 Point goes back to zero (Pis. 9b). With calls from Ukt ossillator 92 is also a 93 to reset the memory 82 eiffl- switches, and finally comes with a win Phanenverschlebung "over who is ready * b« ebroben » Circuit $ a Ganentladungslaffl at Deliehten Ate too reproducible «documents excited. The k »lb» teulas are in Vig. 9f and the signal the osmillator in 90 shown. The words and effects of level and control can be made visible on a steering sailloscope 94 been used for this purpose on a waaffle Deflect the 8-a-nals the Säpzabn% mrato » 86 and the differentiated signals the TriMexe 88j, the to the so-called "Wohneltu-EL * ktrode", received. Km will receive a very applicable to this Assigns " Picture of the regulations to be implemented. The trigger 88 only activates a » special * Circuit which the electrode 21 is a "r" ite wedge-shaped Tensions with a rounded tip »and old wafters wedge-shaped stresses that spreobem one zrimm "tialtwftion geromt $ Ind" eieeut # Autatt the emergency shift through a through the JOUIO- Stfekt b "iM @ * overheating to seretören, this may a »h by Funkoneahlag $ By Mn the electrode at a distance (e.g. a few tenths of a meter) to the metal loop Ult. The between the electrode. md the metal layer jumping points and the thereby erxeugbe Utze seretören the emergency rage. The Pmke »mrgie and / or the duration of the sparks generpaden ZWulve cause the modulation, the dead for the reproduction of the document. The «« tellt "clichés can in this manner ago to the usual must be mulgled to which she own the same Zdohtduroblizeiquet societies. In other words, “the success of the invention Xlischees created by electronic destruction have the same optical properties in the transparency like the clichés " the after the usual photographic and photochromic Process so they can be used in of the same wines and using the same procedures be treated further. If a transparent plate was used as the base 13 , xang came, if necessary, to make reproductions of the cliché.

The clichés can be updated immediately. with this some # -Probedruoko can be produced, because the printer's ink was very good at the points of the base that were used by the Netallsohicht. The constant renewal of the electrode at your place of work enables a continually clean surface, so that the metallic particles that arise during the destruction can not contaminate the electrode and the delicacy and regularity of the preparation process do not affect the process.

Kan has achieved very good results with a decoding speed of about 3 am / sec.

Claims (3)

Claims 1. A method for producing clichés for oftenset printing (typographic printing and light printing), where a black-and-white or colored photographic document (slide, negative or similar) is taken as the starting point, in that an emergency layer covering a base ElectricalInpulao supplied by an electrode is locally heated and destroyed by the electrode scanning the surface of the metal layer synchronously with a light beam scanning the surface of the document to be reproduced, the value of the electrode voltage being related to the voltage of the metal layer and / or the duration of the Electrode recorded pulses are modulated as a function of signals . the durob Xndermgen the Lichtinteneität the scanned "" Rende Produgfe-on to re-. Ü # kunent autsetroftenen ßtrahl "bgndeln J" are generated. 2. The method according to claim 1 ", characterized in that the local heating of the metal layer 2.cht by the Joule-Etfekt is achieved with the aid of direct contact between the electrode and the metal layer. 3. The method according to claim 1, characterized in that The local heating of the metal loop has been achieved by sparks which jump between the metal layer and the electrode kept at a distance (a few tenths of a µm) . 4. 'Method according to one of the preceding claims ", characterized in that a thread-like or band-like element is used as the metal lead that is moved past the processing point. Pre-lighting for carrying out the method according to one of the preceding claims, characterized by a photographic imaging system (1) for you to ropffluni, * »must document 9 eim Installation (Fig. 6) BM system tables and M * - 8093ivOn scanning offlliohor points the documents with Eilte Oifflb LichtbÜndele (20) b * im with emergency CM 8bOrBOM ». v U £ $ »i» oil permeable, below (13). ei »zur UchthOnielabtaatmg synohronisterte w2nri UM (Fig. 4) for palpation the docu »ntsq the one den-shaped ziektrode (21) . transmits and eim electro "specific Vorrjohtun4 (#Lg. 8) for applying a voltage potential to the sheet metal rod, d « greater than the potential of the emergency overfilled under INM Is and then « Vor. wAloder Duration in Ab ~ & »it von der Anae" and Transform mation of the LichtifflIe mdullort, which duroh the Liehtsträhl-Mutuna the Dokiment @ has been generated. Vorriohtung »oh claim 59 & oumb ipk« mejoh »t» that the lead electrode (21) ave an " emergency or" b «. the And there is 9 dft AOWer about svfflpitst «Blektro4« - traver (22) contimder14 whether moving is * Vorriohtmg after requirement 5 ~ 6.0 duua "h gek« M- solob »te du dig UnterINp (13) ilohtdurobUseig ist.