DE2111759A1 - Electrophotographic copier - Google Patents

Description

D II ¹ L. · IN GA GRÜNECKER D R.- ING. H. KINKELDEY DR.-ING. W. STOCKMAIR, Ae, E. ccauf.

PATENT LAWYERS

MONCKEN 22 mu> ! mifionstrasse 43 Telephone 2771 DO / 296744 Te'egromme Monopat Munich Telex 05-2S38O

PH 3830 - 37 / Be

March 11, 1971

OAHON KABTJSHIKI KAISHA

30-2, 3-choine, Shimomaruko, Ohta-ku,
Tokyo, Japan

Elektroiotografisclies copier

The invention relates to an electrophotographic Copier. ■

Electrophotographic copiers currently in existence use for copying an original in sheet or book

form either normal paper or "fein lichteBipfindlich.es" Sheet material. In the case of copiers which are light-sensitive

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When using sheet material, the cost of copying is very high. In contrast For example, the cost of a copy using paper sheets is very low, which is why the devices using them have found widespread use. The ones used in it Intermediate image carriers, however, must be used in the event of damage be interchangeable. Now is the replacement of the intermediate image carrier very cumbersome with such devices or is it necessary to readjust the entire device after it has been replaced, so the advantages achieved by using normal paper are lost again.

An important object of the invention is to provide one electrophotographic copier in a compact design, in which the on wall and space required for replacing the light-sensitive intermediate image carrier limited to a minimum is and in which the inspection or control and maintenance of arranged around the cylindrical intermediate image carrier electrophotographic treatment facilities can be carried out effortlessly after removing the intermediate image carrier.

The invention is particularly directed to an electrophotographic Directed copier, in which a document holder is moved back and forth, the exposure takes place through a slot and the intermediate photosensitive image carrier is in the form of a Drum has. The intermediate image carrier is preferably used as an electrophotographic active, photosensitive body a photo-resistive layer, which is between a surface forming Is arranged insulating layer and an insulating or conductive sub-layer. Copies can be made with the device a template in sheet or book form automatically, quickly and economically on copy carrier material such as sheets of paper od. like, produce.

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The invention relates to an electrophotographic copier which is characterized by a housing by one above an intermediate picture carrier assembly, back and forth bexirep ^ ble original holder, with the intermediate image carrier arrangement one arranged substantially in the center of the housing light-sensitive intermediate image carriers and holding devices for the rotatable mounting of the intermediate image carrier and is fixed removably upwardly from the housing therein by arranged on one side of the intermediate image carrier Chargers, through an optical system for slot exposure of the intermediate image carrier, through a developing device, through on the opposite side of the intermediate image carrier arranged fixing devices as well as cleaning devices, by "arranged on the underside of the intermediate image carrier" Feed or transport devices for a copy carrier material and through an image transmission device.

In the device according to the invention, the different Treatment facilities designed as units or assemblies, \ i? elche easily for control and maintenance purposes and can be built in. In particular, the document holder is what takes up the original to be copied, I move it back and forth placed on top of the device. The copy paper is made using Feeding devices in the form of individual sheets introduced and discharged after copying.

In the middle part of the device housing is the cylindrical one Intermediate image carrier mounted rotatably. On its outer surface he carries a photoresistive layer between an insulating layer forming the surface and an insulating layer or conductive sub-layer is arranged. To the in-between

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Image carriers around are a first charging device, a device for exposure with simultaneous charging, a total exposure device, a developing device, a third charging means, an image transferring means, and Cleaning devices arranged in the specified order in the direction of rotation of the intermediate image carrier.

When it is rotated, the intermediate image carrier is attached to the first charging device by direct current corona discharge positively or negatively charged. At the facility for simultaneous The intermediate image carrier is then exposed and charged with a direct current corona discharge with the first charge opposite polarity or an AC corona discharge exposed while at the same time a ray image of the original to be copied is projected thereon. In the total exposure device will cover the entire surface of the intermediate image carrier is exposed uniformly in order to increase the contrast of the latent image. The one created in this way electrostatic charge image is then created in the developing device using the same or opposite polarity Electrostatically charged toner developed into a negative or positive toner image. The third charger is not necessarily required. However, applying them with the appropriate polarity makes it easier to transfer images the copy paper, which takes place in the following transfer device. The subject of the image transfer is the one still on the intermediate image carrier adhering toner removed therefrom in the cleaning device. The cylindrical intermediate image carrier thus has one cycle or one operation is completed. The copy paper is removed from the intermediate image carrier by means of a detachment device detached, fixed in a fixing device and out of the device carried out.

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Further features, details and advantages of the invention result from the following description of exemplary embodiments with reference to the drawing, which show:

ig. 1 shows an overall view of the photocopier according to the invention,

Jig. Figure 2 is a longitudinal sectional view of the invention Photocopier,

Figure 3 is a cross-sectional view of the device with the arrangement the rotatable cylindrical intermediate image carrier and a reciprocating original holder ,

Fig. 4 is a plan view of the arrangement of the rotatable Intermediate image carrier,

Fig. 5 is an oblique view of the original holder and the Drive device for its back and forth movement, .

6 shows an illustration of the installation and removal of the rotatable intermediate image carrier in an oblique view,

7 shows an illustration of the installation and removal of devices to illuminate the template and charging device,

Fig. 8 is a sectional view of the developing device;

Fig. 9 is an oblique view of devices for the supply from the developer to the development facility,

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Pig. 10 is a partial view of the device according to FIG. 9 on a larger scale,

11 is a side view of the same,

Fig. 12 is a plan view of circulation devices for

the developer in the development facility,

Fig. 13 is a front view of another according to the invention Embodiment of devices for supplying the developer to the developing device,

14 - a side view of the device according to FIG.

15 and 16 side views of a device for opening or closing the outlet opening of a filling funnel,

17 and 18 show two exemplary embodiments of a device for setting the size of rotary steps of an arranged in the single hopper of FIGS. 15 and 16 Auger,

19 is an oblique view of that shown in FIGS. 15 and 16 Shut-off device,

Fig. 20 is a side view of a guide for the copy paper,

21 a partial oblique view of the device according to FIG. 20 on an enlarged scale,

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22 is a side view of devices for controlling

of starting up and. Stopping the development facility,

FIG. 2J is a sectional diagram of the device according to FIG. 22,

24 - an oblique view of the fixing devices of the device according to the invention,

25 is a side view of the same,

26 is a longitudinal sectional view of the same.

Fig. 27 is a sectional view of the cleaning device of the device according to the invention,

28 is a partial plan view of the same on an enlarged scale Scale,

29 is a sectional view of a further embodiment the cleaning device of the device according to the invention,

Figures 30 to 33 used in the cleaning device Brushes for removing the developer,

Fig. 34- means for transporting removed by the cleaning device developer to a collection \

35 shows the method for mounting or detaching a Reference to or from a cleaning roller of the device according to the invention, - _. '

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36 is an end view of a device for controlling the rotation of a cleaning roller,

37 shows a sectional view of the device according to FIG. 36,

38 is a longitudinal sectional view of an embodiment a charging device of the device according to the invention,

39 is a plan view of the same and FIG Fig. 40 is a cross-sectional view of the same.

Fig. 1 shows the copier according to the invention in an overall view. At its top it carries an original holder 11 on which an original is placed with the side to be copied facing down. For the When the slit exposure is carried out, the original holder 11 can be moved back and forth. The copy paper P is through fed to a feed device in individual sheets, passes through the electrophotographic process devices and is discharged through an outlet 12.

A photosensitive layer 1 is formed on the outer surface of a drum 2 rotatable in the direction of the arrow . (Fig. 2). This consists of a surface insulating layer and a conductive or insulating base layer arranged photoresistive layer. To the the rotatable drum 2 forming the intermediate image carrier are a first charging device 4, a device 5 for simultaneous exposure and charging, a total exposure device 6, a development device 7? one third charger 8, an image transmission device 9 and a cleaning device 10 in the specified

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Arranged in order.

The first charging device 4 gives the photosensitive layer Λ of the intermediate image carrier 2 a positive or negative charge by direct current corona discharge. The device 5 for simultaneous exposure and charging charges the photosensitive layer 1 by direct current corona discharge with the polarity opposite to the first charge or by alternating current corona discharge, while at the same time a radiation image of the original to be copied is projected onto the photosensitive layer 1 of the intermediate image carrier 2 in order to generate an electrostatic Generate image. '

The electrostatic latent image is then by means of the total illumination level 6, for example a fluorescent lamp, evenly illuminated to to intensify the effect of the external electric field of the latent image and thus the contrast to improve the electrostatic charge image. at using a toner with an electrostatic Charge from that of the electrostatic latent image opposite polarity is formed in the developing device 7, a positive toner image. Pure development For a negative image, on the other hand, a toner is used whose charge has the same polarity as the charged image. A development process using magnetic brushes or fur brushes is preferably used *

The third charger 8 is not absolutely necessary. Your application with the appropriate

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k ■ '■■■ .-.

However, polarity makes it easier to transfer the the toner image formed on the intermediate image carrier 2 on the copy paper P. The electrostatic transfer of the toner image on the copy paper P takes place in the transfer device 9. After the image transfer Toner still adhering to the photosensitive layer 1 1 is removed therefrom in the cleaning device 10 by means of cleaning rollers.

The copying paper P with the toner image transferred thereon from the photosensitive layer 1 is detached from the intermediate image carrier 2 by means of a detaching device, fixed in the fixing device and discharged through the outlet 12 from the copier. The electrostatic charge of the copy paper P is removed by means of a direct current discharge device 30.

In addition to the devices described above, the copier according to the invention also has drive devices, exposure devices, transport devices, ΒΐεμεΓβίηΓίοΙτΙηΗ ^ βη and the like. A A special feature of the invention is the arrangement of these devices, especially with regard to their and removal as detailed below.

As can be seen from FIG. 3 , the document holder 11 is guided on rollers 17, 18. The roller 17 moves along a rail 1J extending along the housing frame. The roller 18 is mounted in a bracket 16 and moves on a rail 14 arranged in the longitudinal direction of the housing frame. The rail 14 and the roller 18 mounted in the bracket 16 are under-

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half of an inner frame part 15 of the template holder 11 arranged. Lateral displacements of the template holder 11 are due to the double cone shape of the hollow prevents the document holder from moving vertically prevented by a roller 19 mounted in the bracket 16 so that it can move vertically below the rail 14 which is braced with respect to the upper roller 18 by means of springs 20. On the lower frame part 15 of the original holder 11 is a transparent plate 21, for example a glass plate, is arranged. For printing A printing plate 22 is provided for an original on the transparent plate 21.

One in the end disks 1 ^, 1 ^ of the intermediate image carrier 1 arranged bearing 28 penetrating shaft 27 is in retaining plates 25 * * ■ 25o by means of fastening parts 26 / p 26g attached. The retaining plates 25 ^ »25o are through Struts 24 connected to one another and attached to supporting walls 31 / p 3 ^ p "arranged in the device housing the hub of the intermediate image carrier 1 has a drive gear 30 attached.

On a gear wheel G8 on the drive of the intermediate image carrier an actuator CAIH is arranged. It is used to operate a switch MS1, which the Movement of the original holder, a counter and the toner supply controls.

Corresponding grooves 32 are formed on the retaining plates 25, p 252 ^s ^ ⁿ ^ webs 33 and on the supporting walls 3 ^^ »" 3 ^ which serve as guides during the vertical installation and removal of the intermediate image carrier arrangement

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built-in intermediate image carrier assembly is by means of fastening screws 34- secured.

The intermediate image carrier 1 is via a gear G-1, an intermediate gear "" G2 and the drive gear arranged on the hub G4 driven by an electric motor IiT. The intermediate image carrier 1 is driven during operation always in the same direction.

During the exposure, the document holder -11 moves in the direction of arrow A (Fig. 2). Upon termination the exposure, the original holder 11 returns in the direction of arrow B to the starting position. To this Purpose, two pull ropes 351 36 are opposed to each other looped around a drive roller PL and a deflection roller R. The pull cords 35 »36 each have one end at one Bracket 16 attached and the other end to the drive roller PL. Purely the back and forth movement of the original holder 11, two clutches C1, 02 are provided during a working cycle (FIG. 4).

In response to a signal triggered by actuation of a start button, the main motor MT begins, the To drive the intermediate image carrier 1 via the gears G1, G2, G4-. When the switch MS1 is actuated by the switch located on the drive gear G4 of the intermediate image carrier 1 Actuator CAM1 is energized to clutch C1 a drive transmission from the main motor MT via the Gears G1, G2 the clutch C1 and a gear G3 for To manufacture gear wheel GS.

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The gear wheel GS is common with the drive joint PL arranged on a shaft 37. So that is now the drive roller PL is also driven in one direction, in which the pull rope 35 is wound and the pull rope 36 handled-, will-. Accordingly, the document holder 11 now moves at a predetermined speed in the direction of arrow 8, so that the template by a Slit through it, illuminated and a radiation image of the template an.der device 5 for simultaneous exposure and charge is continuously projected onto the intermediate image carrier 1. This creates on the initially charged in the charging device 4 intermediate image carrier 1 an electrostatic charge image.

The circumferential speed of the intermediate image carrier

I stands for the speed of movement of the original holder

II in the direction of arrow A in a specific relationship * At the end of the forward or backward movement of the document holder 11, an actuator CAM2 arranged on the drive gear G8 actuates a microscope holder MS3 _r attached to the device housing, whereby the clutch C1 is released and the clutch G2 is energized. If the direction of rotation of the intermediate image carrier 1 remains the same, the original holder 11 is now driven by the wheels G1, G2, G4-, G5, the clutch C2, the wheels G? and G8 returned to the starting position in the direction of arrow B. A faster return of the document holder 11 can be achieved in that the gear wheel G7 which is in engagement with the gear wheel G8 for the return drive has a smaller number of teeth than that which transmits the drive for the advance. The rapid return of the document holder 11 enables the device to be copied quickly.

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When the original holder 11 arrives in its starting position, an actuator CAM3 arranged on the gear wheel G8 actuates a microswitch MS2, whereupon the main motor MT is braked briefly in order to bring the original holder 11 to a standstill. Shortly after the original holder 11 stops, the clutch C2 is released and the drive transmission between the main motor W MT and the original holder 11 is interrupted. The original holder 11 is thus locked in its starting position. At the same time, the intermediate image carrier 1 is also stopped. The two-stage process described above, in which the original holder 11 is first stopped and only then separated from its drive device, serves to dampen the kinetic energy of the original holder during its return movement.

The illumination system 40 of the copying machine according to the invention includes light sources for illuminating the original, for example in the form of fluorescent tubes 41, ■ h shielding plates 42 and cooling devices, for example a (not shown) fan for cooling the lamp 41 to prevent to decrease the luminance.

The fan directs a flow of cooling air in the longitudinal direction into one of the shielding plates through the document holder 11 42 and an exposure housing 43 limited Space so that the fluorescent lamps 41 are cooled over their entire length. The Fluorescent lamps 41 fed with twice the mains current, to increase their luminosity. As long as there is no exposure, the fluorescent lamps 41 with their Rated current fed, which eliminates the heating-up time and increases the service life of the lamps.

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Light reflected from the original passes through a transparent plate 45 and fastened therein by means of a holder 44 to protect the protective housing 43 against the ingress of dust or the like becomes by -a first at an angle of 4-5 ° to the horizontal An inclined deflecting mirror 46 in the direction of an objective 47 arranged in front of a mirror 48 diverted. The structure of the lens 4? corresponds to one divided into two parts along its axis of symmetry conventional lens with the mirror at its focal point 48 is arranged. The light reflected by the second mirror 48 passes through the objective 47 and a to protect the exposure housing 43 against penetration of dust or the like inserted therein transparent disc 49 and through an opening of the device 5 for Simultaneous exposure and charging to the intermediate image carrier 1.]? for the transparent dust protection disk 49 the use of an electrically conductive one is recommended transparent material, with which the effectiveness of the charging through the device 5 for simultaneous Lets improve exposure and charging.

In Fig. 2 it can be seen that a reflector 50 is a the lamps 41 has a section .. In the area of this The luminosity of the lamp is reduced. The resulting reduction in illumination the "\ irlage" serves to compensate for the decrease in the amount of light in the edge areas of the lens 47 "In one of the shielding plates 42 a slot 5 ^ is formed through which the light from the lamp 41 passes through a shielding plate 52 onto the intermediate image carrier. This light does one Pre-exposure of the intermediate image carrier 1 before charging

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through the first charger 4. The pre-oil seal generally causes an improvement in the image quality "with otherwise unchanged conditions and is in detail in the German patent application P 20 57 456.5-51 described.

The push-off plate 52, the first charging device 4 and the device 5 for simultaneous exposure and charging are combined ^{to form} a unit by means of side plates 53-η> 53o. The side plates 53 ^, 53o have guides 54- for the vertical installation and removal of the unit. This arrangement facilitates the control and maintenance of the first charging device 4 and the device 5 for simultaneous exposure and charging ► This arrangement also facilitates the replacement of the intermediate image carrier 1. Likewise, the light sources 41 are combined with the shielding plates 42 to form a unit which can be pulled out of the side of the device for replacement or cleaning.

In response to a signal triggered by the start button towards the intermediate image carrier 1 begins to rotate. First of all, the pre-exposure takes place by means of the Slit 5 ^ falling light. Then the Charging by the first charger 4. At the Device 5 for simultaneous exposure and charging the intermediate image carrier 1 moved synchronously with the original holder 11 is exposed and charged at the same time, creating an electrostatic latent image. Through the subsequent even illumination of the surface of the intermediate image carrier 1 by means of the total exposure device 6 the contrast of the latent image is increased.

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- ■ 47 -

The subsequent development facility 8 has a pair of side walls 101 and a base plate on, which together form a box-shaped container in which two rotatable between the Seiteiiwandungen Bearing magnetic brushes 102, 103 »two scraper blades "104, 105 and circulation screws 106, 107 are arranged.

The magnetic brushes 102., IO3 each have one non-magnetic shaft on, · as well as a magnetic roller, in which north and south poles are arranged alternately. The magnetic brushes 102 ,. 103 are arranged to one another in such a way that that opposite polarities are opposite to each other (Fig. 8).

The developer 110 is composed of toner and finely divided iron powder as a carrier, polygamy while the supply to the magnetic brushes by means of the circulating screws 106, 107 are thoroughly mixed together. The developer thus mixed is attracted by the magnetic brushes 102, 103. The developer is in predetermined Amount fed from a hopper 108 (Fig. 9) · In doing so, it falls through the filler funnel 108 provided opening 109 and an "opening 111 arranged in the developing device" onto the one end of the circulating screw 106. The circulating screw mixes the concentrated developer 114 supplied from hopper 108 with that in the developing device included developer. 110 and leads the mix of the others Circulating screw 107 closed. Between the circulating screws 106 and 107 a partition wall 112 is arranged so that The developer 110 first moves along the circulation screw 106 must move before entering the processor. ,.

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An opening 113 is formed in the partition wall 112, through which the circulation screw 106 "moved developer 110 reaches the circulation screw 107 and into the developing device. Therein, the developer 110 is picked up by the first magnet roller 102 and by magnetic attraction transferred to the second magnetic roller 103, to v / elcher he

^ adheres evenly and thus forms a so-called magnetic brush ". If the surface of the intermediate image carrier 1 is now on which the electrostatic latent image is formed, swept by the outermost parts of such a magnetic brush, at which the magnetic attraction is generally only weak, these outermost parts become through torn off electrostatic forces of the intermediate image carrier 1, wherein the image is clouded or even destroyed. Around The stripping pawls -104, 105 are used to prevent the magnetic brushes from adversely affecting the image provided, plural marriage, magnetic brushes on a predetermined Shorten the height. The magnetic rollers 102, 103 are driven in the direction of the arrows in Fig. 8, with the latent image

ψ is developed by means of the magnetic brush formed between the intermediate image carrier 1 and the pair of magnetic rollers 102, 103. A visible toner image is created from the latent charge image.

To install the development device 7 device housing or to remove it from the same are on the housing ! Guided tours 115 and at the development facility Guides 116 provided.

Chutes 117 »118 'run around the development device 7, which are opposite the intermediate image carrier 1 open out in dust catcher mouths 119> 120 and with a Dust collection chamber 130 are connected. Scattered or

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- 19- ^:

Flying developer gets through the openings 120 and arrives via the shafts 117, 118 in a bag arranged in the accumulation chamber 130, so that the inside of the photocopier does not have developer flung about by the magnetic rollers 102, 103 can be contaminated. The dust collection chamber 130 and the developing device 107 are as separate units executed, whereby installation and removal of the latter are considerably facilitated.

The filling funnel 108 is on its left side by means of a hinge 108 ^ on the device housing attached (Fig. 10). For expanding the development device 7 or for adding developer to the filling funnel 108 this can be pivoted about the hinge 108 ^. The design of the hopper 108 and the development device 7 as separate units facilitates the installation and removal of the developing device 7 and the filling of developer into the filling funnel 108.

• In the lower part of the funnel 108 there is a Conveyor screw 132 arranged for developers. They are driven by means of a drive device 133 a plunger wreath coil 134 · »which by a of the switch MS1 by the gear G4- arranged on the drive ^ Actuator CAMT is triggered with a Ratchet drive 135 for converting the reciprocating Movement of the coil core in a rotary motion and with two on the shaft of the screw conveyor 132 angeord-. neten overrunning clutches 136, ^ 37 · When the plunger ring coil is energized 134- the screw conveyor 132 becomes gradually

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rotated further, taking a predetermined amount of the developer 114- through the opening 109 into the developer device, 7 falls *

In the event that the automatic feeder the developing device 7 supplied amount of developer is insufficient, for example, when a fc a larger number of copies can be made from an original is, the screw conveyor 132 by means of an outside of the hopper 108 arranged hand crank 139 via a belt 138 and the overrunning clutch 137 can be driven by hand into the respectively desired amount of Entfickler. The developer supply device used has an egg filling opening with a lid and a hand lever to open and close the lid *

The mode of operation of the circulating screws 106 and 107 is explained below with reference to FIG. As already explained above, the development is carried out of the latent image * to a visible during development "means the device according to the invention characterized in that the developer is attracted to the formation of a magnetic brush by Magnetwal2en and then coated, the latent image on the Zwischenbildträger- by the magnetic brush As a result, the ratio of the toner to the carrier changes continuously when copies are made * by continuously replaced map the toner and thoroughly mixed _so, that the tone of the

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developed image remains the same for each copy sheet.

In the described embodiment of the invention, this is achieved in that the two circulating screws 106 _r 107 are arranged on both sides of the partition wall 112 in such a way that they continuously circulate the developer in the axial direction. In order to ensure that the developer gets through the opening 113 at the ends of the circulating screws, the ends of the circulating screws have a counter-rotating screw thread 106-> 10-2. In addition, the passage of the developer is restricted at at least one point between the circulating screws 106, 107 to below the conveying capacity of the circulating screws. The developer is conveyed together with the added toner with thorough mixing by the circulating screw 106 in the direction of the arrow and accumulates at the counter-rotating screw flights 106p. The jammed mixed developer passes through the opening 113 to the developing device 7 in a predetermined amount. Excess developer adhering to the magnet roller 102 is wiped off by the doctor blade 104. The adhesive developer is transferred from the magnetic roller 102 to the magnetic roller 103 and there forms the magnetic brush for the development of the latent image on the intermediate image carrier transported in the direction of the arrow. A part of the by means of the blade 105 from the magnet roller 103

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stripped developer may be attracted to the magnet roller 102 again. The one through the circulating screw 107 developer transported backwards is deflected at its end 107o and arrives again zur Umwälζschnecke 106. In this way is the developer constantly circulated in the "development facility."

The above-described circulation device for the developer has the following advantages: The amount and speed of circulation of the circulated developer is kept constant by the opening 113 formed in the partition 112. As a result, the amount of developer adhering to the magnetic rollers 102, 103 and thus the amount of replaceable toner is also kept constant, so that the developed copies have a uniform density. Likewise, the amount of developer to be scraped off by the blade 104, IO5, and thus the resistance exerted by the blades 104, IO5, is constant, which makes it easier to determine the required drive power. Finally, the amount of developer in circulation can be kept as small as possible, so that symptoms of exhaustion in the developer only occur to a small extent. Another advantage is that the toner fed from the hopper is quickly and thoroughly mixed with the developer returned from the developing device 7. Before the developer reaches the circulating screw IO7 through the throttle opening 113, when it moves along the circulating screw 106 and at its end 106 _? thoroughly mixed so that no uneven concentration occurs even when large amounts of toner are supplied. The two circulating screws 106 and 107 can be the same

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Have structure, woaurcli simplifies their manufacture and is cheaper. ■

To adapt to the increased toner consumption "when copying images or the like or * to the less toner consumption in. Copying originals, which carry only character or the like _T the size of the opening ¹ II3 can by means of an adjusting slide valve or the like may be adjustable.

Figs. 13 to 19 show another embodiment the developer supply device of the invention Copier * There is a hopper 140 on his left side by means of a hinge 142 on the device housing attached 'that he was for the construction of the development facility can be swiveled out of the copier or for filling developer or toner into the filling funnel 140 is * This arrangement therefore facilitates installation and removal the development facility as well as the refilling of Developer in hopper 140.

A gear 152 is provided in the hopper 140 rectangular or angled teeth 153 rotatably mounted. It is engaged with the screw conveyor 143 and is through the rotation of which is driven step by step. At least one stirring blade 154 is attached to the gearwheel to stir the in the feed hopper 140 located developer 1? 0 attached. With this arrangement, the developer is voided prevented in an advantageous manner *

With the swiveling suspension: the feed hopper 140 it is necessary: that its outlet opening 149

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is kept locked as long as it is not over the inlet port. 169 a development facility "is located. A hand-operated closure for this is inconvenient to use and "easily causes contamination of the internal Copier facilities. Therefore, an automatic shutter for the outlet port 149 is preferable.

As from Fig. 1J, 15? 16 is an Ab-P locking member. 155 guided with its end webs 156 in guide slots 157 provided on the outlet opening 149 and loaded by a spring 158. The shut-off member 155 has an outlet opening 149 in the filling funnel 140, corresponding outlet opening 159. For filling in Developer hopper 140 swiveled out to the left the shut-off member 155 is under the tension of the spring 158 held in the position shown in Fig. 15, in which the Outlet opening 149 of the filling funnel 140 through the part of the shut-off element not provided with the outlet opening 159 155 is covered. In this position no developer can Exit the filling funnel fc 140 via the outlet opening 149.

When pivoting the hopper 140 back in the operating position is "the shut-off member 155 by a wall part 160 of the device housing against the action of the Spring 158 moved into the position shown in Fig. 16, in "which the outlet openings 149 of the filling funnel and 159 of the shut-off element 155 lie one above the other. In this Position the screw conveyor 143 developer from the hopper 140 to the opening 169 of the developing device to promote.

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The amount of developer concentrate to be added depends on the type of original. In the case of originals with large black or dark areas, a large amount of developer must be supplied. Accordingly, a smaller amount of developer is required for an original with a few dark areas. The same applies if the size of the copies changes. The automatic developer supply device is generally set to supply a smaller amount. If necessary, a larger amount of developer can then be supplied by manual operation in the manner explained above. _:

The one fed by the automatic feeder The amount of developer can be changed by changing the speed of rotation of the screw conveyor 145. An arrangement for this purpose is shown in Figs. This is the swivel movement of a moving coil drive 143 to enlarge or reduce the individual Rotational steps of the screw conveyor 143 variable. In the embodiment according to FIG. 17, the deflection is one Crank arm 161 of the moving coil drive 145 by means of a handle knob 162 over a Pese 163, a roller 166, a Screw spindle 167 and a stop 164 adjustable. In the embodiment according to FIG. 18, the deflection of the crank arm 161 can be limited by a stop cam 165.

20 and 21 show feed devices 55 and Transport devices 56 for the copy paper.

On by pressing the switch MS1 the actuating member CAM1 triggered on the drive gear G4 becomes a feed roller 57 in

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Rotation offset, which feeds the copy paper P in individual sheets of the transport device 56. This contains first and second pairs of transport rollers 58, 59. The first pair of transport rollers 58 is intermittently driven under the control of signals triggered by means of the actuator CAM1 on the drive gear G4, so that the transport of the copy paper P takes place in a time-controlled manner. This ensures that the toner image developed on the intermediate image carrier Λ is correctly transferred to the copy paper P in the transfer device 9. At the same time, the first pair of transport rollers 58 serves to align the leading edge of the copy paper P in the transverse position.

The second pair of transport rollers 59 is continuously driven and serves to transport the copy paper P. to the image transmission device 9

The leading edge of the copy paper P fed in individual sheets by the feed rollers 57 of the feed device 55 is stopped at the first pair of transport rollers 58, so that the paper P curls up, as shown by the dashed lines P ¹ in FIG. The front edge of the copy sheet P is aligned in the direction of the axes of the first pair of transport rollers 58. In response to a signal triggered by the actuating element CAM2, the rotation of the transport roller pair 58 begins, by means of which the copy paper P is fed to the transport roller pair 59, from which it is transported to the image transmission device 9. There, the copy paper P is placed under pressure on the intermediate image carrier 1 in order to transfer the toner image thereon to the paper P.

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Devices for controlling the operation of the development device are provided in the transport device 56. They contain a Lieht source 6.0, mirrors 61 and 62 and a photoelectric "element 63, which are so arranged in the Bewegungsbahri of the copying paper, to effect the control Deiv developing device 7 with its passage. As long as no sheet of paper P fed \\ ^r ird Thus, the developing device 7 also remains at a standstill, so that the electrostatic charge image is not developed on the intermediate image carrier 1. This prevents contamination of the image transfer device 9 in contact with the intermediate image carrier 1 in the absence of a paper sheet P. Likewise, the cleaning rollers remain in the cleaning device 10 free of contamination.

The paper feed device 55 contains a guide rails 64, 65 which can be easily inserted into and removed from the housing of the device. this retractable copy paper holder. 199. · An. L-shaped guide plates 20Oj 201 are arranged on the right and left sides of the copy paper holder 199. To adapt the size of the copy paper used in each case, the right guide plate 201 can be adjusted in the transverse direction of the copy paper holder 199, while the left guide plate 200 is rigidly attached. Stops 205 are arranged in notches in the L-shaped guide plates 200. They are by springs 20 ^; + loaded inwards and can therefore be placed against the wide edges of the copy paper P under pressure. This device forms a light support for the copy paper and makes it easier to pull off individual sheets.

1098AO / 1565

Ali the outside of the guide plates 200, 201 paper separator levers 207, 208 are pivotable on pins 206 stored. At its free end, each paper separating lever 207, 208 carries a separating claw with a downwardly directed, on the edge of the copy paper P can be placed projection 209 and a horizontally directed, the edge of the paper stack from above loading projection 210. A sheet of paper P moved by the feed roller 57 comes initially in contact with the downwardly directed projection 209 and is retained by this. While that If the middle part of the sheet of paper is moved forward, it will bulge upwards until the top sheet is through the claws are released and then fed to the transport device 56.

To load a stack of copy paper P on the Paper holder 199, a button 67 is first pressed down and a lever arm 66, integral therewith, is pressed clockwise pivoted to the paper separator 107 by attack a downward protrusion 207. * to lift. Through this the separating claws 210 are also lifted off the paper holder 199. Tray Place a stack of copy paper on top of the Copy paper holder 199 releases the button 67 so that the copy release levers 207, 208 are under their own weight Pivot down about the pin 206 until the horizontally extending parts 210 of the separating claws are on top Copy sheet of the stack rest.

For installing the copy paper holder 199 in the housing of the copier or to remove it from the same, the feed roller 57 is activated by turning a handle 68, which is connected to this via a wire 69 or the like, is raised. Through this arrangement

109840/15 65

Is the installation or removal of the copy paper holder 199 relieved.

The one made up of a number of individual roles Feed roller 57 is by means of a shaft 70 mounted on swivel arms 72. The pivot arms 72 are on a drive shaft 71 supported, which the feed roller 57 via chain wheels 73174 · and a chain 75 drives.

The first pair of transport rollers 58 are driven indirectly via a chain wheel 76 and a chain 77 when an electromagnetic clutch C3 (Pig. 21) is actuated. The sprocket 76 is continuously driven. Furthermore, the chain 77 drives a chain wheel 78 arranged on a shaft 78 ^. A gear G9 arranged at the other end of the shaft 78 ^ can optionally be connected in a drive-transmitting manner via a mechanical coupling arrangement 79 to a gear G10 arranged on the drive mile 71. The mechanical coupling arrangement 79 has a lever pivotable about a joint 80, as well as gears G11 to GI3, which are continuously driven by the gear G9 arranged on the shaft 78 ^. The lever 81 is loaded by a spring 82 in a direction in which the gear GI3 is kept out of engagement with the gear G10.

The lower end of the lever 81 is via a damper 83 connected to a plunger coil PL ·. To a signal triggered by pressing the start button the gear wheel G4- connected to the intermediate image carrier 1 is set in rotation. When the switch is pressed MS1 through the actuator CAM1 becomes the plunger core coil

109-840 / 1 66-5

PL energizes and pivots the lever 81 clockwise (Pig. 21). The gear G13 comes into engagement with the gear G-IO, so that the feed roller 57 is driven and a sheet of copy paper P is fed to the first transport roller pair 58.

When the switch MS4- is actuated by means of the actuating element CAM4- pulls clutch C3 and sets the drive connection to the pair of transport rollers 58. At the same time, the plunger coil PL is switched off and as a result, the clutch assembly 79 is released. The drive of the feed roller 57 is thus interrupted, but it rolls during further transport of the copy paper freely on this.

Between tours 85? 86 becomes the copy paper P fed to the second pair of transport rollers 59 and from there between guides 87> 88 through the image transmission device 9 · A beam path 89 »90» 91 runs through the guides 86 to 88 · In the event of an interruption of the beam path 91 through the leading edge of the Copy paper P, the developing device 7 is turned on. The through the beam path 91 between the optical Members 62, 63 determined trigger point is arranged so that the developing device is switched on is before the latent image generated on the intermediate image carrier 1 reaches this. If the beam is interrupted 89 no signal is generated by the leading edge of the copy paper, since the beam path is already interrupted in its part 91 is.

When the copy paper P leaves the part 91 of the beam path with its rear edge, is also no signal triggered because the beam path is still in his

109840/1565

- -5Λ -

Part 89 is interrupted * If, however, the rear edge of the copy paper leaves part 89 of the beam path, so the control devices are used to stop the development device actuated.

Because of "the two release points on the parts 91 and 89 of the ray path "occurs the development of the latent Picture earlier. and stops later, so that the area of the intermediate image carrier 1. is larger than the latent image on it ... The development time is therefore determined by the time, which the development paper for the passage through the two parts 90, 86 of the beam path.

The second pair of transport rollers 59 is connected directly to the main drive motor MT via the chain 77 and is continuously driven by the latter. Should the second transport roller pair 59 stop due to a malfunction while the copy paper 3? is still on the way through its nip, then the removal of the stuck copy paper from the transport device 56 is extremely difficult, especially when the drive motor HT is running, ie without stopping the second transport rollers 59. To make it easier to remove a stuck sheet of paper, the roller 59 ^ of the pair of transport rollers 59 ¹ J- ^ cL, the guide 86 is attached to a side plate 9 ^, which is pivotable about a hinge 93 relative to the side walls 92 of the main part of the transport device 56. By pivoting the side plate 9 ^ the transport roller 59p u ¹¹ ^ ^ i ^e guide 86 can be pulled off the path of movement of the copy paper. This arrangement makes it considerably easier to troubleshoot the copier.

109840715 65

211 759 - 52 -

Another embodiment of devices for controlling the developing devices in the copier according to the invention is shown in FIGS. There are two microswitches 171 in the path of the Eopierpapie.ro? 172 are arranged in such a way that they can be actuated by the copier paper P being transported. The two microswitches Y] Λ , 172 are parallel to each other between a voltage source S and the drive motor MT for driving the developing device * The microswitch Y] Λ is arranged at a point that it is actuated by the leading edge of the transported copy paper P when the The leading edge A of the latent image on the intermediate image carrier 1 reaches the entry point B of the developing device 7 or is just before it. The second microswitch 172 is arranged at a distance 1 behind the first microswitch 71, the distance 1 being equal to the distance on the intermediate image carrier 1 over which the developing device is in operation or somewhat longer than this.

The microswitch Y] Λ is closed by the front edge of the copy paper moved in synchronism with the rotational movement of the intermediate image carrier 1, whereupon the motor MT begins to drive the developing device 7. The ■ actuation of the microswitch 172 by the leading edge of the copy paper P does not trigger a signal, since the microswitch. switch 171 is already closed. Accordingly, no change occurs when microswitch 171 is opened, since microswitch 172 is still closed. Only when the trailing edge of the copy paper leaves the microswitch 172 and thus opens it, the circuit of the motor MT is interrupted and the development

1098 4.0 / 1565

direction 7 comes to a standstill. The development of the latent image on the intermediate image carrier 1 thus takes place from its leading edge A over a distance which corresponds to the distance 1 over which the copy paper P. is transported. Thus, the length of the area on the intermediate image carrier 1, which is in the period between the closing of the microswitch 171 and opening of microswitch 172 is subjected to development equal to the length of the copy paper P.

That through the first and second pairs of transport rollers 58, 59 of the feed device 55 of the image transmission device 9 supplied copy paper is there pressed against the toner image produced on the intermediate image carrier by means of a roller. The roller is preferably made made of an electrically conductive material.

At or near the image transmission device 9 are Detachment devices for detaching the copy paper from the intermediate image carrier 1 arranged after the image transfer.

In it is a release tape 250 over a sector _s . of the cylindrical intermediate image carrier 1 is arranged between this and the copy paper P (Mg. 20). The tape 250 consists, for example, of polyester filia 50 µm thick and runs along at least one side edge of the copy paper so that it overlaps it by about 10 mm. The release tape 250 is held taut by means of a spring 251 attached to one end thereof. A detachment roller 252 arranged directly behind the image transfer device 9 is ^{driven at a rotational speed which is 1} greater than that of the intermediate image carrier 1. The detachment belt 250 has a wrap angle of

1098Λ0 / 1Β65

2 11 ■> 7 ^ 9

less than 180 ° in the A "blending roller 252 out and runs further in a direction leading away from the intermediate image carrier 1. After the image transfer, the side edge becomes of the copier paper P through the release tape 250 detached from the intermediate image carrier 1 and fed to a conveyor belt 253, "which removes the copy paper P from the intermediate image carrier 1 feeds away from the fixing device.

The fixing device shown in Fig. 24, 25, 26

P device has an upper and a lower chamber 300, 301. The upper chamber 300 is through with the lower chamber 301 a hinge 302 connected so that the fixing device lets open. In the open position is the upper Kemmer 300 secured by a support arm 303. This arrangement facilitates the removal of stuck copy paper from the fuser.

The upper chamber 300 contains an upper fixing device 305 with infrared lamps or heaters 304, Bolls arranged around the fixing device 305 3O6 guided wires, which allow direct contact with the Kofc Prevent paper with the lamps or heaters 304. The upper fixing device 305 is on guides 320, 321 can be pulled out laterally from the upper chamber 3OO.

The lower chamber 30I contains a lower fixing device 313 with an infrared lamp or a radiator 3O8, rollers 309, conveyor belt rollers 310, wires 3II guided over the rollers 309 and over the rollers 310 guided conveyor belts 312 'for transporting the copy paper through the fixing device. The lower fixing

109840/1565

- 55 -

furnishings. 313, like the more frequent performances Laterally - pull out of the lower chamber 301.

The two-part design of the fixing device facilitates maintenance and repair work in an advantageous manner to it. , .- ■■■■

Above the upper chamber 300 of the fixing device is a guide plate or baffle plate 3.14- such arranged that air heated in the fixing device by means of a blower along the baffle plate .314 can be ejected from the fixing device.

109840/166 5

211: 7-59

That baffle plate 314- is arranged so that the side edge facing the fan 315 is higher than the one facing it. In this way, overheating of the B ¹ IxI device is effectively prevented.

In the cleaning device 10 are cleaning rollers '506 and 507 held in contact with the intermediate image carrier 1 under pressure and driven in the opposite circumferential direction (Fig. 27.28). The two cleaning rollers each have a roller body 502 or 503 made of elastic material, which on a shaft 5OO or * 50I arranged and with a cleaning cloth 504 or 505. '

The cleaning device has a first and a second. Chamber 509 and 510 respectively, polygons are separated by a partition 5O8. In the first cleaning chamber 509 there is the first cleaning roller 506, a brush ^roller 513 and a screw conveyor 515 for discharging the toner brushed off by the brush roller 513yon of the first cleaning roller 5Ο6 to a toner receiving container 514-. The brush roller 513 has a Shaft 5II on which bristles 512 are attached in a spiral or star shape. The bristles 512 are arranged in such a way that they brush the cleaning roller 5Ο6 in order to brush off the toner therefrom.

An upright stop plate 516 for knocking out the toner hanging between the bristles 512 of the brush roller 513 is provided transversely to the first cleaning chamber 509. The falling toner is blocked by eir. Guide plate 517 ^ ⁽ - '^ Conveyor screw 515 supplied..

1 0 9 8 4 0/1 B B B

ORIGINAL

At the entrance of the first cleaning chamber 509 is a Roller 518 is arranged at a small distance from the intermediate image carrier 1 and driven in the direction of the arrow. The roller 518 serves this also prevents toner from falling out of the cleaning device to prevent. The distance between the roller 518 and the Intermediate image carrier 1 is determined by spacer rings 519, which are freely rotatable in contact with the intermediate image carrier 1. '

The second cleaning roller 50? in. the second cleaning chamber 510 is used to remove toner that has not yet been wiped off the intermediate image carrier 1 by the first cleaning roller 506 to remove. The second cleaning chamber 510 contains the second cleaning roller 507, a brush roller 522 accordingly the roller brush 513 in the first cleaning chamber 509, and an upright stop plate 513 corresponding to the stop plate 516 in the first cleaning chamber to knock out of the toner from the roller brush 522. In the second cleaning chamber 510 opens a suction line 524- for suctioning off the toner thrown around like a mist. In the lower part of the Fptokopiergerätes is a (not shown) suction device -arranged, "which a bag for the aspirated Contains toner. Coarser particles of toner will fall through you Slot 525 between the partition wall 508 and the housing of FIG Cleaning: ^ a device in the direction of the "screw conveyor 515 in the first cleaning chamber 509 · The cleaning device is pivotally mounted on a shaft 526 to the copier housing and by means of a spring-loaded hook 527, ■ which hooks into the strut 24 of the intermediate image carrier arrangement, held in the operating position in which-the two Cleaning rollers 506.5Ο7 with a certain pressure in the system are held on the intermediate image carrier 1. To expand the

j 098AO / 1 565

-3B-

Intermediate image carrier 1 or to replace the cleaning orphans, the cleaning device can be turned in a counter-clockwise direction Swivel away from the intermediate image carrier 1.

Another version of the cleaning device of the he found straight copier is shown in Fig. 29 ″ to J4-. In it, two cleaning rollers 531, 532 arranged parallel to one another are in contact with the intermediate image carrier under pressure 1 held and in this opposite circumferential direction driven. The outer surfaces of the cleaning rollers 531, 532 are covered with a velvet-like material.

Two brush rollers 535 »536 are driven in opposite directions to the cleaning rollers 531» 532 so that they brush them. Upright stop webs 537, 538 are arranged in such a way that the outer ends of the bristles of the brush rollers 535 »555 strike them in order to knock out the toner. He throws toner around in the cleaning device and is sucked off through a suction opening 539. The air inlet in ψ the suction opening is less than 0.8 nr / min. The contamination of the cleaning rollers 531 by toner falling from the cleaning roller 532 is prevented by a guide plate 5 ¹ VO . The guide plate 5 ^ -0 continues downward in a baffle plate 5 ^ 0 ^. This serves to deflect the toner thrown off in a range of 20 ° above and below a line xy to a conveyor roller 5 ^ 3. Free-flying toner passes through an opening 5 ^ 1-Op formed in ^{the guide plate 5 ^ 1 -Op to the} suction opening 539 · The accumulation of flying toner on a sealing skirt 552 is prevented by a further partition 5 ^ 1. Another one

109840/1 565

59 -

Baffle plate 542di ent to it, .den in one. V / in] rides »he el eil · from 20 °. Above all) and below a line xj through the stop tog 538 to deflect the toner knocked off by the borates -536 downwards and to prevent the toner from scattering in the cleaning device. The screw conveyor 5 ^ -3 transports the toner falling on it to a collecting container 55-3 »The above-mentioned parts' 531 to .5 ^v +3 are arranged at a suitable mutual distance in a housing ^ AA- . This is pivotably mounted in a joint -54-5 so that the entire cleaning device and intermediate image carrier 1 can be pivoted away. A Haie en 5 ^ -7 loaded by a spring 5 ^ 6 is suspended in a strut 5 ^ 8 of the housing of the copier and holds the cleaning device in the operating position in which the cleaning rollers 53 ^ ₅ 532 are under pressure . in contact with the intermediate image carrier I.sind the pressure of the Reinigungsv / alzen 531, 532 is adjustable by means of the spring 546 A lid 5 ^ -9 eggs Reinigungr;. means; by means Elemmschrau- ._ ben 551 attached to the housing ^ MA. The sealing skirt 552 is held in contact with the intermediate image carrier 1 at an angle of about 15 in such a way that it cannot scrape off any toner from it "To-prevent the falling of toner from the cleaning device between the intermediate image carrier 1 and the housing 5 ^ 4 ..- Toner falling onto the sealing skirt 552 is-fed-to the-screw conveyor 54-3. Above the cleaning roller 532 an air outlet opening 553 is provided arranges.

Even more adherent to the surface of the intermediate image carrier 1 Toner T is mostly- by the first cleaning roller 531 wiped. Thereafter, still adhering toner residues e T 'become

109840/1565

completely removed by the second cleaning roller 532. The one picked up by the cleaning rollers 531 and 532 Toner is removed by means of the brush rollers 535 or 536 ', so that always, a cleaned surface of the cleaning rollers 531? 532 with the intermediate image carrier 1 in contact comes. The brush rollers 535 »536 carrying the toner clean themselves on the stop bars 537? 538 so that the Cleaning rollers 531? 532 with clean brushes at all times be coated.

Toner falling directly from cleaning roller 531 is through the sealing skirt 552 and the horizontal part the partition 5 ^ -1 of the screw conveyor 5 ^ 3 supplied. At the Toner stuck to the cleaning roller 531 is cleaned by means of the brush roller 535 is brushed off and also falls onto the screw conveyor 543- picked up on the cleaning roller 532 and toner brushed therefrom by the roller brush 536 passes Via the guide plate 540 also to the screw conveyor 543. At the stop bars 537? 538 from the brush rollers 545 resp. 537 whipped toner also falls onto the auger 543. The screw conveyor 543 transports falling on it Toner to a toner collecting container 553 · When the bristles of the brush roller 536 hit the stop web 538, thrown around Toner is deflected downward by the baffle 542 and via the suction opening 539 outside of the Cleaning housing 544 arranged (not shown) Collector supplied. In this way, the interior of the housing 544 of the cleaning device is always free kept from impurities.

10 9 8 4 0/1565

Just a thorough cleaning of the cleaning equipment or to replace the brush rollers 535? 536 will be the clamping screws 551 loosened, the cover 54-9 opened. Pure the control and maintenance of the intermediate image carrier 1 is the cleaning device with its housing 54-4- around the joint 54-5 swiveled away. . ■

The hardness of the cleaning rollers 531 *. 532 is about ' 20 °, the diameter 50 or 66 mm, the speed of rotation about 0.2 to 0.5 "RPM and the pressing force about 20 to 30 kp over a width of 270 mm.

■ In the in Pig. 30 and 31 illustrated brush roller are Kylon bristles 554- with a thickness of 200 µm and one Length of 10 mm held in bores 556, which are in spiral shape with a pitch of 60 mm at a mutual distance of 5 mm are arranged. In another version are the bristles 554- inserted into a U-shaped metal profile 557, whose legs are pressed together to hold the bristles securely ("Pig. 32A and B). The in this way The manufactured brush is then wrapped around a shaft. at Yet another embodiment of the roller brush is the Bristles. 554 - in spiral grooves in a roller body - 555 Resin used. The circumference of the brush rollers 535, 536 preferably overlaps that of the cleaning rollers 531, 532 by about 2 mm. Its speed of rotation is around 60 rpm with an outer diameter of 36 mm. Improved at higher speed the cleaning performance, the service life of the cleaning material with which the cleaning rollers 531? 53.2, is shortened as a result.

109840/1565

♦ si

The stop plates or webs 537, 538 preferably protrude by about 2 mm into the brush rollers 535, 536 Such an arrangement largely avoids damage to the brush rollers by the stop plates or webs. Included however, there is a risk that the toner will soften and stick to the stop plates 537, 538. Such to the Stuck toner can damage the Guide the brush roller. However, if it is knocked off the stop plates by the rotating Bürgt ste, it falls into shape from crusts and collects in the housing of the cleaning in- ^ direction, where it obstructs the access of toner falling from the brushes and cleaning rollers to the screw conveyor. TJm this one To prevent danger, stop parts in the form of round rods can be provided, which are freely rotatable. aside from that the round rods can be coated with a fluorine plastic. By coating with fluorine plastic the softening and setting of the toner can be reduced or even with stop parts in the form of metal sheets or webs even avoid it altogether.

w -. 'Figure 25 shows a method for obtaining a surface of a cleaning roller with a cleaning material, for example a velvet-like fabric, so that the cleaning material is easily replaceable. Since the cleaning material is kept in contact with the intermediate image carrier under pressure and is also brushed by the brush roller, it wears out very quickly, with toner then getting stuck between the universally spun fibers. The removal of the stuck toner by means of the roller brush becomes increasingly difficult during operation, as a result of which the cleaning performance deteriorates. The cleaning material is therefore to be regarded as grinding material, which can be renewed as required.

109 8 40/156 5

¹ For this purpose, the cleaning material 586 initially; a ¹ piece cut off, which is a little longer than the tJfflf "ang" of the roller 5 ^ 7 · At the front edge of the cut off piece ^; A binding material 582, for example a double-sided ribbed strip, is attached to the underside of the cleaning material in a width of 10 "to 20 mm and the cleaning material is thus attached to the cleaning roller 587 (FIG. 35-0. Then it is wound the cleaning material 586 around the cleaning roller 587, including thieves being rotated in the direction of the arrow / The rear edge of the cleaning material 586 overlaps the front edge attached to the roller by a width of about 10 to 20 mm and is firmly connected to it (Fig.

In the described manner with the cleaning material wound "cleaning roller moves in the opposite direction to the intermediate image carrier 1 and 'the brush roller. (Fig. 27 bis 29). Forces exerted on the cleaning material run in the winding direction, so that during cleaning Do not detach the intermediate image carrier 1 from adhering toner * can. To renew the cleaning material 586 can be unroll this effortlessly from the cleaning roller 587 (Fig. 35c, 35D) * The cleaning roller ^ itself does not need to be replaced to become. In that the maintenance described above can be carried out by an operator without difficulty is feasible, the cleaning roller described is special economically. In addition, the possibility Keeping the cleaning rollers clean at all times, all in one Improvement of the copies made,

* the cleaning material

109840 / 1565-

Ba the cleaning roller 58? via a reduction gear with a gear ratio of more than to 1. drive-transmitting with the. Main motor is coupled, it is not possible without interrupting the drive connection to the main motor to replace the cleaning roller 587 of the cleaning material 586 to rotate by hand. on the other hand a complicated clutch arrangement would be impractical for this purpose. .

To keep the cleaning roller 58? "To enable by hand anyway, is with the device according to the invention
a ratchet wheel 574 - by means of a pin 581 outside the side wall 583 of a cleaning device on the shaft 584 - attached to the cleaning roller 587 (Pig. 36, 37). A pawl 573 and an associated tension spring 571 are on
a plate 570 attached, which in turn directly or
is fastened by means of screws 578 to a drive gear 585 arranged next to it and held by a spring ring 579. ■

- ■■ '■■ ■' ■ '.... ■

Due to the arrangement explained above, the cleaning roller is freely rotatable in the direction of the arrow in FIG. 36 when the cleaning device is swiveled away from the photosensitive intermediate image carrier, so that even an inexperienced operator can easily replace the cleaning material 586. Instead of the locking drive 57 ^ to 57 ^ - an overrunning clutch or the like can also be provided.

109840/1565

In a modified embodiment of the invention can in the cleaning device instead of the elastic cleaning rollers "Existing scraper strips made of an elastic material, which are in contact with the intermediate image carrier 1 and can be pulled out laterally on the device housing are.

In the photocopying machine, reliability and ease of maintenance are two important factors. Accordingly are different in the photocopier according to the invention Facilities provided that increase operational safety and facilitate maintenance and care. One of these devices concerns the charger of the device. The device according to the invention contains three charging devices, namely the first charging device 4, the device 5 for simultaneous exposure and charging and the third charger 8. The first charger 4 and the device 5 for simultaneous exposure and Charging are combined in a common unit, to remove it from the device by simply pulling it out to facilitate upwards. The third charger can also be used 8 can be easily removed from the device.

Because the charging devices with a high operating voltage 'can work if the discharge electrode or the discharge wire is damaged or torn off dangerous situation arise. The device according to the invention contains therefore an electrical safety device for the automatic Interrupting the "connection between the charging device and a voltage source if it is torn off or damaged of the discharge wire or the electrode. This arrangement is described in detail below with reference to FIGS. 38, 39. ,

1 098 AO / .1 5.65 ■

The charging device contains wire electrodes 400, Shielding plates 401 and insulating brackets 402, 403 The insulating brackets 402, 40J are at the ends of the Shielding plate 401 attached. On the holder 403 is a connection 404 for connection to a high voltage source attached in the device housing. Is on the bracket part 402 a handle knob-405 attached. Using adjusting screws 408, 409 are on the insulating holders 402, 403 adjustable guides 406, 407 for adjusting the position of the electrodes 400 held. By turning the adjusting screws 408, 409, the guide parts 406, 407 can be moved vertically, in order to set the most favorable distance between the intermediate image carrier 1 and the charging electrodes 400. The guide part 407 is provided with notches 410 for receiving the wire electrodes 400 to their mutual spacing within the shielding plate 401. to ensure »The Wire electrodes 400 are each provided with one end Screws 411 attached to the insulating bracket 402. The other ends of the wire electrodes 400 are through on the guide part 407 formed notches 410 out, looped around pins 412, through a slot 413 in the holder 403 out and attached to a pull pin 415. Of the Pull pin 415 is loaded to the left by a spring 414 and electrically connected to terminal 404.

When the wire electrodes 400 tear, the tension pin 415 is displaced to the left by the spring 414 and comes into contact with the closure plate 416, which fastened by means of the adjusting screw 409 and conductive with the shielding plate 401 is connected, whereby the high voltage is now connected to ground. This leads the charging device now no. ©: Hpsh tension more.

109840/1. £ 6 5

^! As from Fig. ' 39 borrowed, insulating cover members 417, 418 are detachably attached to the brackets 402, .403 "in such a way that only the part of the wire electrodes on which the corona discharge takes place is exposed.

The precisely guided transport of the copy paper through the entire photocopier is extremely important for the correct operation of the same. For this reason, J recommended the use of "monitoring equipment. Which indicate a possible setting of the copy paper · in any process equipment of the device ^1. Such devices are the hard seats of a copy paper provide an indication or fast automatically turn off the device. ·

After the intermediate image carrier 1 of the invention Device triggered by pressing a start button If the signal begins to rotate, the is actuated Microswitch MS4 "by the actuator CAW4. As a result the actuator CAM4 controls the synchronization of the Transport of the copy paper by the first transport roller pair 58 to the image transmission device 9 with the rotation of the intermediate image carrier 1, so that the developed toner Mld on the intermediate image carrier 1 in the image transmission device 9 exactly is transferred to the desired location on the copy paper P. Between the start of the transport of the copy paper P through the first pair of transport rollers 58 and the actuation of one on the other the timer device arranged by the fixing device through the copy paper is assumed to be a period of time T ^. One Timer (not shown) on order is on a period of time Tp set which is shorter than that by the intermediate image carrier required for one revolution, but longer than T ^.

1098 AO / 1 56 5 - ■ ^ V

2? 11759

The timer is so arranged that ER- at dear ·· revolution of the intermediate image carrier 1 gleiciizeitig with the ";. Is operable by the Betätigimgsglied GiIHl control switch MS1 If after the period ¹ S ^ soch no actuation of the timer arrangement Yoo durcli the Foirderkamt © this E © pier- papiers P, an alarm display is triggered or · the heating devices of the sixierrichiaing are switched off.

• ■ '■■■. ■■■ .. ■ · ■' · ■ '. ■ '.: ■

The timer device 700 can be an IC switch, but a light source "0i" in connection with a photoelectric element JQ2 (Kg 24) is more expedient. Such an arrangement ensures reliable monitoring regardless of the properties of the copy paper or the copy carrier material.

109840/1565

Claims (8)

Patent claims ; ~ λ3 electrophotographic copier \. characterized by a housing, by an original holder (11) movable back and forth above an intermediate image carrier assembly, the intermediate image carrier assembly having a light-sensitive intermediate image carrier (1) arranged essentially in the center of the housing and holding devices (24 to 27) for the rotatable mounting of the intermediate image carrier and is removably attached to the housing in this, by arranged on one side of the intermediate image carrier charging devices (4, 5. 7), by means of fixing devices (300 to "$ 12) as well as cleaning facilities (1O), through at the Underside of the intermediate image carrier (1) arranged Feeder or Transport facilities (55,56) for a Kbpi carrier material (P) and through an image transfer— facility (9). 2. Copier according to claim 1, d a d u r c h g e k e η η ζ e ic h η e t that the optical system one light-tight housing (43) with mirrors arranged therein 109840/1565 (44,48) and an objective arranged in front of a mirror (47) has that at least one light source (41) for illuminating an original, partially enveloping the light sources Reflectors (50) and shields (42) are present, in which the light sources (41) together with the Reflectors (50) are held, and that the shields (42) laterally from the housing (43) can be pulled out therein are arranged. 3. Copier according to claim 2, characterized in that that a reflector (50) is partially cut out and that a shield (42) has a cutout corresponding to the cutout of the reflector, through which light from the light source (41) can be projected onto the intermediate image carrier (1) is. 4.. Photocopier, marked by a housing, by one on top of this. reciprocable document holder (11) with drive devices (35i36 ϊϊ /, β) for its back and forth Movement, through an, electrophotographic directionally sensitive intermediate image carrier (1), 'which in Holders (25) of an intermediate image carrier arrangement is rotatably mounted essentially in the middle of the housing, by one on one side of the intermediate image carrier (1) arranged first charger (4), a device (5) for simultaneous exposure and charging, an optical system (40 to 50) 10 "98AO / 1565 and a developing device (7) through on the opposite side of the intermediate image carrier (1) arranged "ITljclereinrichtungen (300 to 312) and Einigungselnrichtungen (10), through below the Facilities located in the intermediate image carrier (55.56) for supply T> betw. the transport of a carrier material and by an image transmission device (9) j wherein the intermediate image carrier arrangement in the Housing is arranged upwardly removable from this and the first charging device (4) and the Device (5) for simultaneous exposure and charging can be removed from the housing in an upward direction unit arranged therein are combined. 5. Copier according to one of claims 1 to 4, d a d u r c h ge ken η ζ eic h η e t that the developing device (7) a container (100) for the developer, two rotatable between side walls Magnetic brushes mounted on the Entleklungseinrichtung (7) (102, ^ 03) ^ 'scraper blades (104,105) for Limiting the diameter of the magnetic brushes and two . "on both sides of a partition (112) for circulating the Developer's rolling snow, which can be driven in opposite directions (106,107) which has both right and also left-hand screw parts' (106 ^, IÖ62 107 ^ 1, 107p) where "at the partition with a Passage opening (ii3) for the developer opposite is provided in a place where the right and the left common part of at least one circulatory tendon (106,107) meet. ·. * '- 98 40/1585 SZ 6. Eopiergerätr according to claim 5 * dadurchgek e rr. η, ζ ei clae t,. that the opening (113) is dimensioned in such a way that the throughput of the developing developer passing through is lower than the quantity of material that can be conveyed by means of the circulating screws (106, 107). 7 · Copy machine after. Claim 5 or 6, - as the U. deer ken β. ζ e χ eh · a e. t that the. Development in ^; direction (7) also developer / refill devices with a filling funnel (108), a screw conveyor (1-32) arranged on its bottom and devices (134 to 136) for their intermittent drive; has, and that the developer by means of these ITachfülleinriehtungen. Can be introduced into the developer container (100) via an opening (111) formed on the upper side of the developer container (100). 8. Copier according to claim 7 * thereby g- & -> «- ■ k e η ii ze i. c h η e t, .that the opening and closing Opening (111) of the developer container (100) in response to the opening and closing of an outlet opening (109) of the funnel (108) can be brought about. 9. Copier according to claim 7 or 8, characterized geke η η ζ eic hn et that the hopper (108) also has a with the screw conveyor (132) in engagement. / And by means of this intermittently drives ^: bare ¹ .Stir device ( 152 to 154). 109840/1565 SZ 10 -.- "■. Copier according to at least one of claims 1 to 9, d a d ur c 2r g e k e η η ζ e i c h η e t that the feed "or feed and transport devices (55» 56) for 'the copy carrier material (P) a holder. (199) for the material (P), at least one feed roller (57) for "piece-by-piece" feeding of the material, pairs of transport rollers (58 * 59) in its guideway, guide plates (85 to 88) and devices for controlling the start-up and stopping the development facility (?). 11. Copier according to claim 10, d a d u r c h g e k e η η ζ e i c h ηe t that the control devices for Starting and stopping the development device (7) two at a mutual distance in the guide track of the Copy carrier material (P) arranged scanning devices (62,63 or 60,61), by means of which the operation the developing device (7) from the arrival of the leading edge of the copy carrier material (P) at the first scanning device until its trailing edge emerges from the second scanning device can be effected. 12. Copier according to claim 11, characterized that the first and second scanning devices are microswitches (I7I and 1? 2, respectively). 13 · Copier according to claim 11, d ad u r c h g. e k e η η ζ e i c h η e t that the first and second scanning devices by a light source (60), a pair of mirrors (6-1,62) and a photoelectric element (63). 109 8ΛOV1565 14. Copier according to claim 10, characterized in that one roller of a pair of transport rollers (59) ^un ^ one of the corresponding guide plates (85) is attached to the main part of the housing. and that the other roller (59p) of the relevant pair and optionally a guide plate (86) is attached to a retaining wall (94-) which can be pivoted open for access to the guide path of the copy carrier material (P). 15. Copier according to at least one of claims 1 to 14, characterized in that the fixing device has an upper and a lower chamber (300 or 301), which each heating devices (304, respectively, 308) and around which one each Chain or at least one wire (307 or 311) around the individual, Sprockets or guide rollers (3Ο6 or 309) arranged around chambers are guided. W 16. -Copier according to claim I5, characterized 'ge - k en η ζ egg level that the fixing device a in its upper part (305) formed air chamber, an air baffle (314-) arranged inclined in its upper part and a suction fan (315) located at one end of the chamber. 17. Copier according to claim. 15 »by g e k e η -η, ζ e i η e t, that the upper and the lower Part (305 or 31.3) of the fixing device are arranged therein so that they can be pulled out laterally from the housing. 109 840/156 5 ^J copier according to v / ehigsfeens · one of claims 1 i7 ^ - "4 ^: ä d ü rc ^ h '"' g "ek e '^; η η ζ calibrate' e ~ t -, ■ that the cleaning device (10 ) "sum cleaning the intermediate image carrier" (1) under pressure type has these 'attachable elastic parts';"· - ■ - '' ^: ''''"-'- ■ "'-' ■ · ■ · - ■■ · ■■ "· 19. Kopiergörät according to "claim 18, since you r e la: ge kenn 2 eich η et that the elastic parts as scrapers, blades,: strips and the like. Made of elastic material and" sideways * can be pulled out of the 'housing are arranged therein. '· -' ■ ■ '·''■'"■ 20. ''Copier according to' AnSpI ¹ UCh 1-8 or 19, - d ä through geke ^: η η * ζ 'ei C ^- h ^: η ^ e 1 /,' ■ - that the cleaning device (10) rotates ■ ReIiiI-gu> ögsWaiz% n ^: '' - 'C5ö6 ¹ _i 5ö7)''madeof' easy 'elastic material, brush rollers (5 ^ 13,522)' for cleaning the cleaning rollers, a chamber (509) for the first cleaning roller (5Ο6) with a toner collector (514315) and part of a chamber (510) arranged in its lower part; for: the second rotatable cleaning roller ^v e (507) ^{: n} as well as one together with this ^; maneuvering brush roller (5 ^: 22 ^! } ⁱ - ^; un'd toner from SaUg ¹ C Einriehtungen (52 ¥) ^; auf'Weist. ■ "■■"^; * ^; ·· - ·· ^ - - ■■ - ■ · ■ ■ '■ -' ■■. ■>·;. ■ ■:.: ■. .V _: ■., - ■ 21. A copier according to claim 20, characterized in that the cleaning device furthermore has a roll n (5 * i8) ^ zuTni ITer- ^ '-' ■ which is arranged in the direction of rotation of the intermediate image (1) near its entrance side Challenges of aliens toner from the -Rdinigungsein-- ■ <■ - includes direction '. "''"'' * "- ^! - '^:; - · - ¹ - ¹ ' - '■■ ■■ - · - ■'? -. / I; · H 22. - Copier according to claim · 20 or 21 ,, dadurc h. geke η η ζ e I ch η et that the cleaning device (10) also contains a sealing skirt (552) arranged in Drelirichtun ^ of the intermediate image carrier (i) near its entrance to prevent toner from falling out of the cleaning device. 25. Copier according to one.der claims 20 to 22, characterized in that the The cleaning device (10) is also located between the free ends of the bristles (512 or 521) of the brush rollers (513 "or 522) extending fixed parts (516 or 523) contains. 24. Copier according to at least one of claims 20 to 23, characterized in that each of the cleaning rollers (506, 507) has a roller body (502 or 503) made of elastic material and a roller body enveloping cleaning material (586), which with a transverse edge along a parallel to the Axis of the roller body (502, 503) extending line cohesively connected to this, in the direction of rotation Wrapped around the cylinder in the opposite direction to the cylinder and with the other transverse edge, overlapping the first. _. Transverse edge is firmly attached to this. 25. Copier according to at least claim 4, characterized in that a third charging device (8) is present and that each charging device 1098 40 / 1.56 5. ORIGINAL IPISPECTK) SI Asehirjiiplatteii (4Q1), at both ends of which are consolidated, insulating holding parts (4Qv?), at least one between this extending discharge wire, a the discharge ^, a spring holding the wires under tension and one. Addition contains (41§), 26, copier at least after. Claim 4 ,. furthermore geke η η ζ e i q ¹ O, η etdurqk on the setting Tron Eopieträgeriaaterial (P) appealing instructions. Copying machine naßk Dadure claim 26, characterized h that the ÜTaerv / achungseiiirichtungeii (QAI-LJMS) for 41agreifen a ^ ^ eitn hiaeranordiaung. of the time YQni beginning of Yorseliubs hzyi, transport of the. Copy carrier material (P) Ms to its exit from the transport facilities as well as a "certain period of time adjustable timer limit, by means of which the setting of the copy carrier material (P) can be triggered indicating the signal _? if the The transport or advancement time of the copy carrier material (P) is longer than the time span set on the timer arrangement, 8 8 40/1185