DE1497213A1 - Method and device for fixing a xerographic powder image - Google Patents

Description

U97213

EAHK IBROX LIMITED, 37/41 Mortimer Street, London, V. 1, England

Method and device for a xerographic powder image.

jjJrfinaung concerns aeraphy and ^; in addition, a new method and a new device for improving the quality of xerographic productions, which are characterized in that the '"non-image areas are free from undesired deposits of the developer powder

j3eiüL ■ xerographic process, for example in the US patent published on October 6, 1942 2 297 691 by Cariacn is the surface a xerographic plate made from. one layer one photoconductive, insulating material on a conductive Underlay, with an even electrical 3-wire strand, then the

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original to be reproduced exposed, usually using conventional Projection method. This exposure discharges the / ! "laugh on the xerographic plate according to the incident Radiation intensity and thus creates a latent electrostatic image on or in the photoconductive layer.

The latent image is developed with an electret ; statically charged, finely distributed substance, such as an electrical. troscopic powder that is in surface contact with the photoconductive Layer is brought, and is held there in a kuster corresponding to the latent electrostatic image will. After that, the developed xerographic image becomes common transferred to a JCopy carrier, where it is by appropriate Funds can be fixed.

The xerographic method is widely used and has found wide conical use by its use in automatic devices that are in a position, to produce excellent productions with rapid throughput. These machines literally make millions every month Copies using a xerographic plate in the fform of a rotating cylindrical 'JrOMuel, one after the other the various stations of the copying process run through t. With each 'working cycle, the ϊ-drum is generally after the transfer process from the best of the development powder cleaned in order for the next AnjBitsCycle Yiieder .aerei.t-ζμ .. be. Such machines work fully automatically from the instant when an operator an Oru.giiaal in the Koplerlage brings, up to the ejection of the free copy,., The: j, e as desired from one or more reproductions of the original

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ginals can commit. "',;

A. Problem that so far the optimal quality of this Production impaired, 1st, the unwanted diffuse Deposition of the xerographic developer - »powder in the background or in the non-image areas of the original production. This

Hangel is generally inherent in the development system, but it can also be caused by dirty originals, by lenses soiled with powder, or the like, which make undesired development appear powdery in the final reproduction , the lurs-ueilent ^ development ^ the maghetic brush, the * cascade development, etc. belong. All these types of development bring the development powder, called "iDoner", to the charge jumper so that it can be developed. In the case of the!. "AskadenentYiicklujig, the developer consists of a combination of a crblger substance in i ⁿ ori ^ of '!' Rfageririigelehen ijad vain IPöxiers, as ceisx ^ ielsrieise is disclosed in US Pat. No. 2,558,416 to Walkup. This is Geüiiscit miä sprayed over the latent '3ild -υα £ - the p-iotolei'jenaen layer. V / as' also i_x.er is used for a üntv-acklungssysteiii, the soner rubs aii the irc. £, srivj:; sti ^ rz | dadiich v ^ ixd an dem ΐο-ner a t ^ iboeiektrisciie liadu-ig vg: ^ e ^ LascÄxteii polarity er z euVt '..iiL cc-i aei "Sr ^ gersu-Oötsiis, vcji Lw ^ \> .e? iDoiier. eatzerat- is, a Laä. ". ^ uer against ^ engeset-teii polarity" xde triboeleitri-. sclie: i Prc ^ ssse vei'lcv-iie :. ^ = CiOch st & tisOiseh * αιι & niaii..weiß. That. :: icit all ^^ -_ & ι? ρ ££; ΐϋώ6ΐ to. Lur "S £ .lue ^. Iiohe or; to the same polajbityu ^:. Ciiisi, \? Earth, the". O, -ι! Irzisl ^ ii ziöciite *. -As Polge "this- uixv": lll : o ^: eneii tri ^ oeleitri & ehsn effect has been &: _ iitlich

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.the incompletely charged loner the endeavor * himself unintentionally deposit in the non-image areas of the xerographic plate, from where he -later transferred to the final copy and is fixed there. In addition, you see, there are more as we know Toner particles in the non-image zones due to purely mechanical forces when the developer of the photoconductive layer is presented * ■ ■.

Before fusing, all of the developer substance, namely those on the desired image and those on the unwanted background deposited just loosely pinned on and is therefore very difficult to selectively remove. To Melting is "at the current state of the art! Technology of all powders so permanently fixed that selective elimination even more difficult. 'So the efforts so far have had that To remove deposit on the backgroundj no success, although the necessity has long been recognized.

In addition to the described problem of background deposition, there has long been the vuinsch of being able to "remove unwanted image areas" during the copying process, be it from the original, the transference or the like. .tion of Qx ± ^ ± ^ .ax to copy & uf the latest build. penetrate to the customer nit the latest information su supply. Dauei he _& AoE so far Sonwierigkeiten, 'because it was not possible uie ongevvüli-cei üldDert , icj: ie to remove without hand-intervening in front of the a-cuiüielzf ixiei-eii ^ it, for example to put the copy sheet " ^ m-wlsc-ei. ■

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The present invention provides a new method and a new device that has an improved xerographic Provide a copy by the fact that the diffuse deposit on the background is properly eliminated, and the possibility to gain access Meten, unusual image areas from the final Automatically remove copy. ·

The aim of the invention is to provide a new method and a new device for making xerographic "reproductions to create improved quality.

In accordance with the invention, the improved serographic reproductions are formed on a copy sheet, which is practical Free of diffuse developer powder in the image-free background areas is. At the same time, according to the invention, production is carried out Unexpected Mldf prevented from laughing. The inventive The method and the device according to the invention provide Inclusion in tiiiem autoiuatisclien ^ erOgraphiegerät for the generation xerograpiiisciier reproductions of high quality a rational Improvement so that. the economy of the device is increased significantly. - ■ ---

These and other objects are achieved in accordance with the invention

solved by loubiiiation of chillers and cleaning, whereby

the ooii- ^ elz ^ lied beiu Sciijielzfixieren selectively on the copy medium only for electroscopic substances in mass; idiGhten that a -.ilu. correspond to, act ^ tl .. becomes, while at the same time it is practical is ineffective for the cohesion of the diffuse doner sub- -ütaiiz ß'erin ^ er - "assendioiite, as it is the diffuse background-

a ".jla _w augmentation corresponds Since day fusing so selelitiv going Sien, lce." ii ^ acn since the deposition on äeiu background - aor iieiiii ^ a ^ s ^ h ^ se exrtx'eauit- \ varden, ueispaelsv-else by

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Wipe without affecting the image areas of the! Reproduction

to be attacked. Besides the characteristic of being selective The solamel member is characterized according to fusible fixation the invention still by a warm-up time that compare with the approximately 20 seconds to 15 minutes with previous continuously operating devices is practically zero, as well as a residual heat of almost zero, which is a momentary Abbruah. the öcimelzvorgangs. makes possible. ! This last one iierknial allows the device to be timed to make it ineffective for the passage of reproduced unwanted parts of the picture, so .dab this in the subsequent cleaning be able to ground away. -

Further objects, features and advantages of the invention ^ ehen from the following description with reference to the attached Z eiclmungeri, ^ s aeigen:

! ü'ig.1 a schüiatiscj-ieii. Elevation of an automatic (device in which also the skin fixing and cleaning of the final reproduction is carried out according to the invention) j
Pig. 2 an isometric view of the bcii ^ elzwiedes, dac in

i! ^l ig.1 sclie_.ati ^ ss-eigt istj-. ' -

! B'ig.3 an isometric view of the cleaning device, ax in! fig. 1 shown schematically, iatj

Mg, 4 an isometric view of an iceiiiigjuagsvor ^ aiigs of Hand, the alternative to using the ueiniguui ^ sVor-. direction of the 3? ig.1. after the ocuu.elzfixieren atc.t-ufia.iaeu can ι "

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Pig. 5 and 6 alternative üOna the device, which can be used for one after, the fusing according to the invention are; ·

3? Ig «7 an isometrisolie ffieilaiisicht of a device that the shows temporary ineffectiveness of the fusible link, by daa you unwanted parts of the image on the copy the fusible link can pass without this SGhiaelzf ixiert »

For a general understanding of the xerographic system into which the invention is incorporated, reference is made to Fig. 1, in which the various components of the sehemati-söh system are illustrated. The xerography machine now described may be of the type disclosed in TJSA Patent 2,945,434 to Eicher et al. As with all xerographic systems that are based on the deu iärfinauiigsthought of the Garlson-I-atent mentioned, a perfect image of the original to be reproduced is projected onto the sensitized surface of a xerograph.:isciiexx plate, where a latent electrostatic image is created. Daaii wii'd ge.v; oj: mlicii ά & π latent charge image ii. With the help of an electroscopically charged jänt-? Fi ekler substance ei ^ viclelt, so_ that a ^ ercgrapliisclies powder image disfigures the de_ latent image au ± \ the surface of the xerogra- lxisc.:e:i Plc .-: - each corresponds. Da-- developed B ^ lä then becomes ^ 's-jf ci._ie ^. ^ o ^ ieträger uL-ertrsgen, v, -o it uittels an iclit ^ ng leadi'ce ^ d fixed ^ ira.

-i Jl _. 1 iöt a lic _J .i'uv. ^ Du.i: c__li'ssi £ _es ü-eiit. »- 3e Io dar-Cc. :. ". L3 _ ■ -: t-oii £ -" ü.-ιj.e ._cc. - _ 6St "^ .- ia ai.ix""i ^^ t. J) t: s

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original to be reproduced, "for example a book Sheet or the like marked '11 is in an imaging station 12. The. Imaging station includes one horizontally arranged, transparent plate 13, such as a glass plate on which the original rests in one position, so that it can be scanned optically. The projection of the original image is done with the help of a scanning mechanism, the has two transversely arranged I-fluorescent lamps 22 and 23, which differs horizontally from the one shown with solid lines Move the Iiage to the position indicated by the dashed line let "This is more precise in the above-mentioned patent" by Eichler described. Light shields 24 and 25 also prevent, in addition to the light necessary for illuminating the original Scattered light is still being emitted · A picture of the .lit Originals is going through. Objective lenses 26 sent that are move horizontally according to the lamps and .The image down through its slit diaphragm 28 on the surface Throw a xerographic plate. The latter has the jjbrm a rotating drum 29. '

The xerographic door drum 29 has a cylinder which is mounted in suitable bearings in the mascara space and is rotated counterclockwise by a motor 50 at constant speed. The velocity is proportional to the scan velocity & m original, wherein the peripheral speed of the TrombeIiläene ^l is equal to the wanderuügs.gescj.winäigkeit LiIU-. The OJr oiiiuiel surface v.eist a layer of piiotoleiteiidem isolating ^ aOt rial ^ 1 -, - üei-spivlweise vitreous selenium, ', the. <.— ei ^ ei- eleitrifce ^. lazy

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tend pad 32 _f, for example aluminum, is applied. 'Gate of the exposure, the drum surface is sensitized with the aid of an Eoroha discharge device 33, which is supplied by a'. expedient source of high potential being energized. The corona discharge device may be of the type described in tTcjA patent 2,965,75 © to Vyverberg.

The exposure of the! Roniiüel with the original discharges the photoconductor light in the areas affected by the light, which creates a latent electrostatic image on the ü ^ om ^ el * in a contour corresponding to the projected image. figuration remains. While the, iEromniel moves on ^ The latent alactrostatic image runs through a development astation 40 »in which one consists of two components Developer substance 41 by means of a developing device 42 is spread over the 3! Drum surface, Me iJntwick-

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Substance can be derived from that described in the Walkup patent lyp aein. ·. *,

In the Ifcitwicklungseinrichtung -äaf two-iiiiliwiGklsr 41 is guided by an appropriately driven front 43 naoli above and in a channel 44 entlaattli, from where it is down on the iroinmal surface and the latent image develops.

The löner-contributor 45 the development, the is consumed in intwiokeln, becomes from a storage container .46 supplements 1 vott where a ^. Expenditure management in controlled » Quantities discharged T.

After the twisting, the powder image runs eiiii ■

'' Transfer station 50 _t where a second corona

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discharge device 52 »which is similar to device 33, is transferred onto a sheet of copy paper 53. The copy sheets are stacked on a storage table 54 and are from passed there individually by means of a mechanical feeder 55. This pushes the top sheet of the stack between rotating feed rollers 56, which coordinate the sheet with the arrival of the developed image at the XTb transfer station bring it into contact with the rotating drum *

A pick-up mechanism ensures the transmission * 57 for removing the copy sheet from the drum surface, from where the Kcpierblatt on an endless conveyor 5S, brought will. This transports the copy sheet through the According to the invention, smelting device 6o and cleaning device 61, as will be described in more detail later, this will be The image remains on the copy sheet with the help of the Scximel link fixed while the iuier wished diffuse EuIv er deposition in the background using the cleaning device Will get removed. The finished copy then runs through others Transport rollers into a vertical conveyor system 65 that carries the copy delivers to a copy holder 66, which is on the top surface of the housing Io is arranged. The copy came from there turn away

Haph of transmission passes through the surface o.er xerographic drum a cleaning station 7o, where they are from a brush 71 is turned away so that "the remaining" on the Removal of remaining developing substance from the drum surface will. The powder removed by the irom ^ el is extracted with the help of a Fan 73 sucked through an opening 72 and into a

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ausn-ehmbareii co-loot el 74 on genoiaaeii. The drum surface then passes a discharge station 75 where it is illuminated by a fluorescent lamp 76. In this one, the £ üiromiiieloberflache completely is with licnt flooded _r SSO DAFE each about residual electrostatic charge of it is removed. In the system, there are appropriate Iicrt dazzles, which all shine light with the exception of the projected image - during the migration of the Irommel from a point shortly before the sensitization by the Eorona discharge device 33 to behind the development station 4o from the Tr oia ^ e praise him keep away from the area »

In the following, ^{reference is made to J 1} Ig >> 2, where the melting device of FIG. 1 is shown in more detail. Üas fusible link has two semi-ring-shaped machined brackets 8o and 81, which are used for fastening in the device of Pig.1. Everyone. The bracket is pierced and receives an internally polished Heflektorgehäuse 82, which is designed in a semicircle. At its lower end, the housing runs out into two opposite planes 8f and 84, which converge at an angle to the horizontal and form a continuous opening 85 between them. A sheathed hearing lamp 86, which is held in a base 87, is connected to an adjustable junction element 86, which extends axially through the housing and parallel to the ciilitz 85. I / ie Lauipe is characterized ctj.rcix the j? T ± Lig.keit aua, predominantly an otralil-ang iiaiie äe ^. I-nfrero.tgebiet with a \ u

• length LUiI; εr 2 '-, 2 Likron ausziustnäe:!, V »as eirier j? Adenteiaperaturvon annUl_c.rnc 1 poo ⁰ !, Tiats ^ richt * xij. in the order shown.

ninc-t die- 'L- -_. _w ee ^ üe seIcIiε o-jsiluu. ^ a that the reflective

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Inner surface of housing 82 shows a picture of the lamp's thread system on 'throws a copy sheet 89 which passes underneath. Through this the image areas 9o are melted down without the loosely scattered toner particles 91 on the background areas would be noticeably attacked »Optionally, other keflector shapes, like elliptical, double parabolic and the- " same used to charge the light source To depict the ochmelite on the copy sheet.

The exact conditions under which the lamp operated is, are regulated by the voltage, which is supplied by a controllable transformer 88, in such a way that the desired ff-adentempergitur is maintained »Das Papier ·, commonly used in xerography, is in Reflecting the above-mentioned length range so strongly that the lamp emits energy when it is optimally set, which is only selectively effective and only `` the large amount of toner particles present, -that embody the image, heated. This can be explained by the theory that the part of the radiation energy, e.g. 3. radiation close to the infrared range, which is directed at the toner images, is absorbed and that these image areas are heated thereby. Simultaneously reflects the copy carrier, whose surface for the emitted The wavelength is highly reflective, the received radiation, instead of absorbing it. Alsi becomes the radiant energy, which falls on the commonly glazed paper surface, which is lighter in color than the developer, does not produce thermal energy

transformed, whereas aie pigmented.i. devopers, the ii_ general black si_id, strong v, are heat-absorbing, so άε_Γ;

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They convert the radiation into thermal energy and are fused onto the paper surface. At the same time, the diffuse loner has in and on 'the background areas "such: send eights low mass that it absorbs the smelters, ungenüngende amounts of radiation So the areas behave reflective _r as if no £ would oner present -Reproduktionen of.. · Typewritten templates typically have image densities above 0.6, while the diffuse ions on the background usually have densities below o.1 »

When the lamp has the desired temperature, 75? £ of the energy emitted by the radiation source is below 2 ^% '[2. Micron. In this area of length, the paper reflects strongly, while the developer toner absorbs most of the incident energy. In the locations of the image j configuration occurs melting of 3) onerablagerung a, \ because the radiation energy is absorbed and increases the ÜJonertemperatar, in turn, heated by conduction the paper. At the same time, the smaller particles, which represent the diffuse background deposition, and a larger: quotient surface. Volume, because they lose most of the energy they have absorbed through radiation and convection and therefore do not heat the paper sufficiently for the binding. The incident energy that causes the melting generally consists of direct radiation from the lamp, which is limited by the exposure slit 85, as well as the focused radiation which passes through the slit and that from the reflector system of the Housing formed image of the dtraiiluxigscjzelle

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contains. The effectiveness of selective silencing can be achieved by the ratio of direct radiation to that through the focus The energy density emitted by safe radiation can be changed.

Jür selective öcimielziixierung _o e ^ of -Erfindung AESS was one. 135o-Vatt-LaL.pe used, as it is manufactured by the General Electric Coupany as l'ype Ϊ- 2'i'2 «volfracilainpe nit quartz bulb. Paper speeds of about 1.4 inches / second (3.5 ciii / s) resulted in the no tv; The final sciu-elsy / effect with a transformer setting, which eircspracn a consumption of about 700 watts through the lamp. 1 '''The original transformer settings were also usable at speeds of up to 1.7 inches / second (2o - 43 ϊεϊ / s). The longer waves emitted by the lamp should be limited, is used by a Ii ο tor bi ^; lostrieoenes GreblEs.e b2 , Ud air volumes of over 1o Xubikxuss per minute (o.2ö m. ^J /iid.u.) from the environment into the housing at the 'Lei ^^ e past üu bevie ^ eii, which exit through the slot 85. This keeps the i'e ^^ er6: - ture of the lamp bulb low, so that very little energy is emitted from the bulb. In this way the bulb is prevented from a second radiator is used, since this would otherwise cause the melting in part.

After the basing of the ο co ^ e lagixe des, the image areas 9o aux the copy sheet 89 are permanently x'ixitrt, v; -ixuc. the diffuse particles on a background are only loosely so that they can be wiped off or otherwise eliminated, there are various "procedures" for the other side. as useful orviieseii. ^ 1λ ui ^ ues ferfö ^ rexi wira curü ^.

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Device of Pig.1 and 3 embodies an automatic Removal of background deposit allowed. The direction of the gate 61 "causes a cascade cleaning of the copy sheet that you by one between parallel guide members 95 and 96 guide gap formed ?, ird. The sheet is then from the mouth of two driven ICl enroll en -97 "and 93 detected, which it in an inlet slot 118 on the front rope of the Push in the device.

The Heiiiigmigsvorrichtung 61 comprises a moderately deep tank Ιοί, which is approximately semi-cylindrical shaped on its boae surface and at its ends by end walls to2. and 1o3 is complete. It contains a "certain length of electroscopic carrier spheres 115 which is sufficient, among other things, to attract the fixed toner and remove it from the decorative sheet. The electroscopic carrier spheres 115 are of the type normally used in association with" the developing toner and are described, for example, in the patent from walkup. “Here, however, these little little carriers are initially used - without the addition of toner. Bearing plates 99 are attached to the end walls. in these a 'shaft 1o4 is mounted, on which a paddle wheel 1o5 sits, which lets the carrier balls on the middle side of the passing Zopierblatxes -here.Oriese.ln, xäe ociiaufeln 1o6 of the och on elrades are ri: ± gs around the »skins- I04 fastened - .. ■ tied and in v.ese: itliehen χί & ο-ι forwards in ^ direction of rotation. curved. On this, <sise they carry the jJi'LgarkLrelchen all around in the 2s.:3k and endless en ze unxer liiiT.Tir-.mi ^ the centrifugal force, while they siCxi: .e ^ enlü ^ Lig ^ u ^ e_ li- O ^ ie ^ cl ^ -i ^ move. The uC "aufelrs.Q-."Ii'u το. H - ^ - l.ctcr Ho gtur-eit, ier Lc * r a. ^^ £ _.eiisenea- ■

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be 111 and a timing belt 112 with a pulley 113 connected is »which is stuck on the shaft 1.o4. The paddle wheel will be on the order of about at high speed Rotated 2oo rpm.

The top of the thank you is covered by a cover 116 locked to prevent! that the moving wearers little balls escape. The cover has several 'air holes 117' through which the inside of the tank is kept at the pressure of the surroundings will. The lid 116 has a width slightly less than the full width of the tank, and is arranged as - *. See the drawings -. That an inlet slot 118 remains free through which the copy sheets 89 get into the tank., As well as a Exit '119 through which the copy sheets leave the tank. The carrier balls contained in the tank paint over the copying sheet passing through under a spray effect and pull because of their inherent triboelectric Properties that are de-staii- during continuous movement. the are, all loosely held powder from άβϋΐ underneath passing copy sheet 89 from. As a result, there occurs & Copy sheet through exit 119; practically exempt from eilleu Toner particles except those in the image areas have been permanently fixed beforehand. A flexible mushroom wiper 122 is attached to the exit part of the lid, who wipes the copy sheet passing by, Ui .. zu verüiaaei'ii, that adhering to the surface of the copy sheet. iUbuckle-.chen escape. After frequent verv.e_iaux; g v.erden the 'jJrc-gerkii «- gelchen with toner, contaminated uid need-by, a fresh one Mllung be replaced, the emerging copy sheet is vca

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the mouth of two revolving conveyor rollers 123 and -. 124 taken, which push it through a guide slot formed by guide parts 125 and 126, from where the copy sheet arrives in the conveyor 6 ^ mentioned above.

Instead of the one shown in FIG. 1, other automatic cleaning devices can also be used. 5 shows a brush cleaning system 135 through which the copy sheet 89 is drawn over a stationary plate 14o with the aid of two rotating conveyor roller pairs 136 and 137. The cleaning device has one or more rotating brushes 138 which are driven by a motor 139. The 3orsten of the brush are constantly brought into contact with the image surface of the copy sheet passing through. The brushes are accommodated in a housing 141 which is continuously evacuated by a fan 142 with a motor 143. The brushes, which remain in constant contact with the surface of the copy sheet, achieve the same cleaning effect as the cascade cleaning device previously described. The brushes are preferably characterized by the triboelectric attraction of the loose powder particles and can, for example, consist of natural or synthetic fibers known in the art. The vacuum generated by the fan 142 draws the stripped toner particles from the bristles of the brush and sucks them through a two-size filter so that the brush remains relatively clean for a long time. ; "■ 6 shows another Beinigungsvorriolitung 15o '' This is equipped with automatic, kontinuierliohtii supply a soft, intended for single use Qe ''

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Woven, such as cotton, in the form of a continuous web 151 "The roll is fed from a pre-winding roller 152 and runs over two soft, resilient guide rollers 153 and 154" which press the web against the surface of the copy sheet passing through. The web is then ^s up by a take-up roll 155 taken which is driven by a motor 156th The web travels at a relatively slow speed compared to the speed of travel of the copy sheet, and preferably in the opposite direction to the latter. As a result, the cleanest part of the web meets the lowest concentration of diffuse toner 91. With a disposable web material, the dirty, used material on the take-up roll can be thrown away, and it can also be cleaned for reuse.

For other forms of cleaning the copy sheet in the device described above, the copy sheet can be used together with the diffuse loner 91 on the background let the device run out. Then the background deposition can wiped off the copying surface by hand in the manner of FIG. 4 with a soft cotton fabric 13o or the like will. In J? Ig.4 it can be seen that the upper rope of the copy sheet that has already been wiped with the üaumwοHappen is almost or completely free of the diffuse background deposition 91, while the lower part, the still to be wiped off, any such dxffu.se particles contains

As mentioned, the Lanipe 86 chosen is preferred characterized by their ability to

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Melting force through radiation to achieve the necessary working state practically immediately after the power supply. »Furthermore, the lamp has an extremely low residual heat so that it interrupts the main emission of melting energy within about 100 milliseconds after being switched off. This property of the preferred type of lanipen enables controlled switching on and off in a way that certain lines of the copy sheet can pass under the fusible link without the relatively thin toner masses of the image areas of these cells melting as otherwise. V / ie 'already mentioned There has long been a desire to be able to delete unwanted image areas in order to bring the message up to date. Various control cams, gears, clocks or the like can be used to temporally relate the circuit of the clay device to the movement of the on the melting device one passing copy sheet and off in l ig.7 a paper transport 161 is shown ^-.?. of the may be described in US Patentscurift of liiciihorn among others Fr. '5 o99 945 of the type transport uses a G-ripe rod 162, which is connected to two opposite endless friction chains 164 and has several individual u-rings 165, i ie the Iiopierblatt 39 on the ochmelzvorrich 'tung voroeltrans ^ crtleren. ■.

. Ti, beis ^ i 'lsv / else that O'C - ^ elZlauipe at the right trcnscortlage of ICopierblattes, ά.la "if the ScAimelzen läiiga of ν he alilaufenden band cies sheet veriiindert weräs: i should Abz ULSclitlteii, I-1 a l._iki-osciialter 1o5 provided-, the iiBcs ^ i ei-ier de .. · ^ reioketten u_aä ZTvar ^ wisc ^ en these and

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the side hand of the copy sheet is attached. Of the Microswitch is in the circuit of the melting device and has a long contact arm 166 which slopes up from the switch into the path of the "moving G-tire" bar extends and is released from it. Once the grab bar detects the contact arm, the switch switches the melting direction for a certain period of time, Ms the G-tire bar has completely traversed the contact arm 166. The length of the contact is based on the dimension of the copy to be deleted coordinated that j if the copy sheet is running at 1.4 inches / sec " (3 * 5 cm / s) passes through »the melt link for the duration of approximately 0.35 seconds is switched off, which over time coincides in which the piece to be deleted arrives and the Melting point happens Kople ^ blaitei v?! ??! * -Viif scnon beeohriöbeni the non-enamel-fixed Piece away. There may be appropriate delays ctie controlled shutdown are provided the melting device on every desired piece of the copy sheet to vote *,

In the foregoing description, a new method and apparatus is disclosed "by which the ultimate quality of a xerographic reproduction by the elimination of the; undesirable s, iDoneis diffuse in the background areas is improved _# At the same time allow the erfiiidungsgemäße method and apparatus according to the invention eliminate unwanted .Bildteile of reproduction line by line. They offer a very advantageous method, the Gfe "samtq.ua, ihität without expensive and time-consuming fixtures or '. 909824/0556 BAD onmiHAL ''

Controls as used up to now have been improved au ·. "So the invention provides a simple and very effective smock

at hand to resolve a difficulty solion.lange ; waiting for a solution. (

Many variations are within the scope of the invention

in the above construction and many quite different ones.

Execution forms possible. The subject of the drawings should - therefore "only be an example and not a restrictive one Have an effect «

909824/0556 bad o ^

Claims (1)

. 5 Method for! Fixing a heat fusible Powder! Idea on one. Copy carrier, except for the powder image still has diffuse powder in the non-image areas ι d-ä-s has a lower.-Liassendiohte than the developed one Image, characterized in that a) the surface of the copy medium for a predetermined period of time long exposure to near infrared radiation .be, d ^ .e is able to melt a powder density corresponding to the image by heating, whereas it is practically ineffective for melting a diffuse pulper. appropriate powder density,
and that · b) the surface of the copy carrier is cleaned, wherein selectively the unsophisticated, diffuse powder from the Surface is removed, 809824/0556 bathroom 2. Verfahr s according to claim 1, characterized in that the powder image is a developed xerographic image. 3. The method according spoke 1 or 2, characterized in that that the radiation acting on the picture in the main ν.em Vvelleiilängebereich "up to a maximum of 2.5 ilikrön listened to. . . 4 »Method according to claim 1, 2 or 3» characterized in that that purification consists in the fact that a lot of, ' electroscopic irägerkugelchen -'over the surface of the Copy medium can be sprayed to the loosely seated on it To remove powder particles electrostatically. 5 »Method according to claim 1, 2 or 3, characterized in that the agreement" consists "that the surface the copy carrier wiped off with a soft fiber material will. · 6 «method according to claim 1 ,. 2 or 3 »characterized by that cleaning consists in brushing the surface of the copy medium with a brush Bristles are relatively clean of powder particles, 7 · ö-erät zuii producing a χ er ο graphic reproduction, in de: ^ a developed xer ο graphic copy of an original is produced on the surface of an ICopy carrier, with a pralitiseii unavoidable.-At; Iu. ₀ orjaig -vcn diffriseru iüit- 909824/0856 BAD ■■■■■ ^ K- / ■■ . ■ ^_:; ■ ;; ■,:. wiokler powder in the non-image areas with a lower mass density ι all-the developed image has, her * - is identified, by the following a production ■ without deposits and diffiieem developer in the non-image areas providing the correctness &) tine SohmelaTerriohtung Ί (6ο) with · one; Radiation source * the-one near that. Infrared radiation emits, is appropriate over the Eppieiräger and controllable in such a way that it diohten the developer console in measures that the. ν :; "'" developed-image entöpreohenf anohmelt, but on ■ the developer Maseendiohien «» that of the diffuse storage b) - a ^x SeinigtogsDoor direction || 1) | die- on the surface of the Xopieträge; re after the Schmelgsfixierung becomes effective - ": ■■■ - tajad dal ö.iöh * b ^ geiehmoajsene intwieklerpulVer removed * / 8, G-eraii naeh Anepliuoh 7 »marked by the fact that the StratLlungseLuelle der SohmelaTorriohiaing a liampe (86) is | whose radiation in the main sacrh is less than 2 * 5 microns = Wavelength has * G-device naoh anaprueft 7 or 8, thereby e that the 3Jampe is held in a housing (82), in of the bottom a slit | 65) for the radiation to exit formed ie-fe, which are directed at the oil surface of the continuously passing copy carrier (89) underneath is. 909824/0550 1o. Device according to claim 9, characterized in that the lamp housing (82) around the lamp emits radiation has reflective surface and with respect to the Position of the lamp is geometrically shaped such that it focuses the radiation through the slot. 11. Device according to one of claims 7 "to to., Characterized by a conveyor (58) that carries your copy carrier one after the other from an image receiving station to the drum device and transported from there to the equipment. 12. Device according to one of claims 7 to 11 »characterized in that that the inclining device comprises a rotating brush (138) which is constantly in contact with the Surface of the Iiopia carrier (89) "remains. (J? Ig.5) Device according to one of Claims 7 to 11, characterized characterized in that the inclination device is a soft one Having a length of fabric (151) and a direction (152-156), who keep them in constant contact with the J flat brings. (i? ig.6) 14. Device according to one of claims 7 to 11, characterized in that that the cleaning device is a cascade or Spray device (61) is a lot electroacoustic kettle (115) containing 'loading (1o1) has, ueijsen V / Ülnae an inlet (118) 809824 / 0S56 BAD OB4QINAL , and form an outlet (119) through which a melt- .fixed copy (89) enters or exits, as well as a "Vorriohtungteil" (1o5> To6) that the Q) carrier beads are in contact with the surface of the device passing through Copy carrier brings such. that the developer particles sitting loosely on the image surface are removed from the " To be deducted trostatically. (S ¹ Ig. 3) c 15. Device according to one of claims 7 to 14, characterized in that that the radiation source of the ochmelzvorrichtung has the property, practically immediately after switching on to send out the energy necessary for melting, , and that they have an extremely low residual heat after switching off having. 16. The device according to claim 155, characterized by a Control (165,166) for the radiation source, which this . in accordance with the arrival of unwanted picture lines of the developed xerographic copy in the Melting position switches off for a certain period of time. BATH 90982A / 0556 it « -ψτ