DE2939795A1 - ELECTROPHOTOCOPYER - Google Patents

Description

2933795

Patent attorneys

Utnweber & Zimmermann

Rose Valley 71 II. Task

D - 8000 Munich 2

-1.0Kt 1979

Lionel Liloonfield Hoffman rtykoff, New Jersey 07481, USA

El ektropho to copier

The invention relates generally to an Elektropho tokopiergerät in the form of a Ί1 copier for playing back a Copy from an original on a copy sheet and especially on compact plain paper-K. copy machine, its energy requirements is minimal.

Single paper electrophotocopiers are known devices for reproducing originals on ordinary or plain paper. Such devices typically have a reusable one A photoreceptor comprising a conductive substrate coated with a photoconductive material, further a supply of single copy sheets and several operating points for Performing the necessary operations on the photoconductor and copy sheets. In a typical copying sequence, the photoconductor evenly charged and then with the image of an illuminated one Originals exposed. Those parts of the photoreceiver on which the image

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image that falls from the original characters their charging as the charge is dissipated in the exposed areas. Forms on the photoconductive layer of the photoreceptor thus a latent β electrostatic image. Next will the latent image is developed by using the photoreceptor electrically attractable toner particles is brought into contact, which adhere to the charge areas of the photoconductive layer that make up the latent image builds up. The toner image is then transferred to the copy sheet, where the toner is baked onto the sheet to fix the image on it.

The older models of plain paper copiers were generally large, elaborate, and complicated devices that constantly use energy consumed, even in idle or standby mode. The dimensions these devices were great because either one had the photoreceptor supporting drum with a relatively large radius was provided or but a photo re ze ρ to r in the form of a tape or a path that moved past the copy processing points over a long distance. However, devices of this type are unfortunately not suitable for some users whose offices are only small or who need copying is kept within a modest framework.

From the other side, efforts were therefore made to reduce the dimensions of the simple paper copier or to operate in other ways Way to simplify to the spatial and economic needs of the consumer with a relatively low workload who wants to yet make easy paper copies. To illustrate these efforts, for example, refer to the U.S. Patents 4,012,138, 4,017,170, 3,819,261, and 5,606,532 to refer. The devices described in these patents are, however, afflicted with one or several defects, for example in the form of the use of a drum-mounted η photoreceptor, which takes up a relatively large volume of space, a movable one optical system that is expensive and operationally complicated can be, separate tinting and cleaning places and a burner that constantly consumes energy, even if no copies getting produced. Those aimed at dimensional reduction The end result is often the creation of prerequisites

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directions that are difficult to maintain, as access to critical components that need to be serviced, can be hindered by other closely spaced components. There is accordingly a need for a compact device with closely spaced η and easily accessible components required for operation.

A number of copiers use a photoreceptor in the form of a belt or web. These photoreceptors look for one side of the roller or platen from themselves emigrate, which carries the tape, so that a misalignment of the Photoreceptors enters. Others have solved this problem by using crowned drive and support rollers. But these solutions are complex, so that there is still an unmet need consists of a relatively simple and inexpensive tape alignment system.

The invention accordingly has the object of a compact To create simple paper copier in the form of a table-top device, in which the aforementioned deficiencies do not apply.

The energy consumption of the copier should be minimal.

Furthermore, the copier should only consume energy when copies are actually being made with the device.

A relatively short photo receptor belt should also be used.

Furthermore, the photo to receptor belt is supposed to be held by two rollers of unequal size.

The roller axes should be tilted against each other in order to act on the photoreceptor in one direction.

A Z-shaped beam path should continue to be provided and a number of operating points should be practical all as well as the photoreceptor can be placed between the ends of the beam path.

The intention is to provide a control system by which the photoreceptor belt is used in the manufacture of any desired

030015 / 08flß

Copy of an original driven to a rotary movement over two revolutions and that to control the operating sequence to the Operating points is used at each cycle. A number of operational or processing positions should be attached to a hinged upper one Support structure may be provided so that the operating points supported by this can be pivoted, whereby the remaining parts of the device become freely accessible.

A lower removable support structure for the copy paper feed should also be provided so that access to the Devices is made even easier.

A common actuating means should be used for tilting or inclination of the rollers, provided for transferring the developer into the operative position and for supporting the drive roller be.

In summary, it should be noted that the invention is a Copier relates to the above problem in the way is fair, as is briefly outlined below and in the following should then be described in more detail.

The device according to the invention has a photo receptor belt, which is carried by two rollers of different, unequal diameters, namely by a drive roller of relatively large diameter and from a roller of relatively small diameter. The photoreceptor belt therefore takes on a shape that is reminiscent of the shape of a teardrop. The device according to the invention is in a rectangular Housing housed, with the large roller is arranged at the one upper corner, while the small roller from the large roller is generally diagonally offset.

In the context of the invention, the photo is receptor tape in one Perfect alignment is kept by the axes of the two rollers deliberately arranged in an angular position to one another from the outset will. This pre-adjustment of the rollers causes the photoreceptor belt to move laterally as the rollers rotate is acted upon or migrates to one side. In the preferred embodiment, the necessary deflection is achieved by inclination the smaller roller accomplished. At that end of the largest

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»30015/0890

Outer Y / alze, _r , where the band migrates, a splash is arranged. The flange prevents the belt from sliding off the rollers and thus keeps the belt in proper alignment with respect to the other operating locations.

I. Your treatment or operating centers and others Actuators are along the outer surface of the Pho gate sensor tape arranged. A loading point and a development point are provided near the larger roller. A transfer agency and conveyance for the copy sheets is near the smaller roller arranged. A discharge point and a discharge point are located between the smaller roller and the larger roller as well as next to the Transfer agency and the funding for the copy sheets.

In the context of the invention i .st a reciprocating Carriage provided to allow a scan exposure of an original an illumination point can be made with one at the Top of the housing provided below the reciprocating cart Exposure slit is formed. The image of the scanned original arrives via a Z-shaped beam path from the Exposure slot to an illumination point between the loading point and the development center. The most of Treatment or operating centers and other essential means of operation are between the two ends of the Z-shaped beam path provided, resulting in the compactness of the device according to the invention contributes overall.

The device according to the invention has a hinged upper one Support structure on which several operating points are provided. More specifically, the upper support structure is arranged in series Incandescent lamps that serve to erase the image, a discharge or neutralization point, the car, the illumination point with the exposure slit and the illuminating lamps, the optical system (two inclined Mirror with an interposed lens) and the charging point. The upper support structure is located on the top of the housing, in which the device is housed. The support structure is connected to the housing by a hinge that extends the width of the housing extends so that the support structure can be opened or raised like a shell wall. This type of connection enables

light easy access to the rest of the equipment that lie under the upper support structure.

In the context of the invention, a lower support structure is also provided which carries a number of actuating elements which are arranged below the Pho tor ze ρ tors. The lower support structure contains a storage compartment for the copy sheets, in which a stack of Kinfach paper copy sheets is stored, which are used for making copies. The lower support structure also supports two retard rollers and a transfer station. A fed copy sheet is picked up in the nip of the retard rollers, which then delay further conveyance until the right moment, whereupon the copy sheet is fed between the retard rollers so that it comes in perfect alignment with the toned or developed image on the Photoreceptor belt is present. The storage compartment for the copy sheets can be slidingly removed from the lower support structure and pushed back into it when the supply of copy sheets is to be supplemented or another format of the copy sheets is to be selected. In addition, the entire lower support structure can also be removed as a whole, so that the underside of the photoreceptor and the developer can be accessed. The lower support structure is removed from the device in a direction opposite to the direction of movement of the copy sheets. This last-mentioned feature is particularly advantageous in eliminating any paper jams that may occur, since when pulling out the lower support structure, the jammed copy sheets tend to be loosened or loosened in this case, which prevents damage to sensitive components such as those of the transfer point and the photoreactor belt.

The lower support structure is also suitable for actuating a number of essential actuating elements or operating points by guiding them into the respective positions provided for this purpose and disengaging them again. The larger roller and development site (a magnetic brush developer) are connected to the lower support structure by a combination of linkage and curves. If the lower support structure is pulled out, so

Ö3Ö015 / 089Ö

if the intermediate roller is shifted in the direction of the drive roller, see above that the photo gate ze ρ gate hinge is relaxed. Also is the magnetic brush disengaged from its operating position in which it is with the Photo to receptor band is brought into cover. The photo receptor band as such can be exchanged and the magnetic brush is for maintenance purposes or accessible to fill up the tint. if If the lower support structure is pushed in all the way, it comes out of the connecting rods and the curves existing combination in action and causes a displacement or indentation of the smaller roller into their normal working position, which tightens the photoconductor belt and the axis of the larger roller is adjusted at an angle to the smaller roller. Also, the magnetic brush is in their Shifted actuation position in which it is with the photoreceptor and covers.

The lower support structure also provides a certain amount of support for the larger roller, which is essentially on the housing Is arranged in a cantilevered manner. A strut carried by the lower support structure engages the unab ge supported end of the larger one Roller on and thus serves to provide additional support and alignment of the larger roller and the photo gate ze ρ to rs against the rest Operating points and operating elements.

No energy is required to run the copier in State of readiness to drive. The development office and the fixing point also bear in common within the scope of the invention

to the relatively low energy requirements for making the copies during the actual copying process. To this end, the Development unit has a magnetic brush developer that is used for processing a corresponding pressure-fixable η tweeter is suitable. The development site also has the puncture of a cleaning site , at which the untransferred toner is removed from the photoreceptor belt, eliminating the need for dedicated to provide a cleaning device, which is normally a suction device would understand. At the fusing site, two pressure fusing rollers are provided to which a copy sheet is fed carries a tinted or developed image. The one from the fuser rollers The pressure exerted on the copy sheet and the toner is sufficient to make the

Ö30Ö1S / 08ÖG

To fix the driver on the Konieblatt permanently, so that it is not it is necessary to provide an electrically heated stoving device.

The control system provided within the scope of the invention comprises a set of curves by means of which a set of corresponding control switches is actuated, which in turn serve to selectively start up or switch on certain operating points and other essential operating elements. The control system causes the photo receptor belt to make two revolutions for each copy. At the beginning of the first revolution, the larger roller is coupled to a main motor, the rotating movement of the magnetic brush begins and the '/ Jagen moves from a basic position over the exposure slit. Practically simultaneously with the initiation of the first cycle, the control system starts the lamp of the illumination point and the charging point. During the first revolution, the copy sheet is fed to the retard rollers. At a predetermined point in time, the control system actuates the retard rollers so that; the copy sheet comes into contact with the toner image and is aligned on this, whereupon the transfer of the toner to the copy sheet is initiated. As the leading edge of the scanned area on the photoreceptor wraps around the smaller roller, the copy sheet is separated from the photoreceptor and fed to the nip of the fuser rollers. The leading edge of the remaining latent image is then passed out along with non-transferred tint to the image erase lamps and unloading wn, which they like that remain in operation throughout the copy.

When the second revolution of the photoreceptor begins, begins the return of the carriage to the starting position. The tax system disables the corona charger and healing lamps Operation. The latter is necessary to clean the Pho tor ze ρ tor from not transmitted tweeter. During the photo re ze ρ to r in the second round is passed by the magnetic brush, the not transferred Toner particles attracted by the magnetic brush, as practical the total electrostatic charge of the speaker at the discharge point was neutralized. The Ko ro na transmission device becomes one out of operation at a predetermined point in time during the first cycle

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7.939795

sets, so that a charging of the non-exposed areas of the photoreceptor is avoided. If only one copy is to be made, the entire copier is switched off at the end of the second cycle. If, on the other hand, several copies are to be made, the above sequence of operations is repeated for each copy until the desired one Number of copies is present, whereupon the copier is put out of operation.

Further details, advantages and features of the invention result from the following description and the drawing expressly those regarding all details not described in the text is referred. En show:

Fig. 1 shows a scheme ti elevation of the erfi η dungs ge according η Copier;

Fig. 2 is a partial side view showing the upper support structure in the raised position (solid lines) and in the working position (broken lines) »

3A is a partial perspective internal view of the one Side of the niagne brush, photoreceptor belt and rollers as well of the lower support structure, in the drawing Parts have broken off *

3B is a perspective partial view of the tilting device for the intermediate roller »

FIG. 4 is a view in the manner of FIG. 3A, but from FIG seen from the other side of the device »

FIG. 5A is a side view of the tilting device in FIG the working position;

FIG. 5B shows a side view of the tilting device in FIG the relaxation position »

Figure 6a. a side view corresponding to FIG. 5A of the Tightened photoreceptor bands in alignment with the Magnetic brush »

FIG. 6b shows a side view of the FIG. 5B corresponding to relaxed photoreceptor band that no longer aligns itself

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030015/0888

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7A through 7F are a series of views showing the holding approximately curve η are shown;

8 is a schematic perspective view of the Drive system, slightly overdrawn in places to clarify the drive connection between the components of the drive system »

Figure 9 is an electrical schematic diagram for the copier proposed tax system »and

Fig. 10 is a held in the form of a bar diagram representation of the loading sequence of operations of the copier for single and Multiple copy operation.

First of all, the components required for operation will be explained in more detail will. The copier 10 has a rectangular reciprocating carriage 12 that is movable on the top of a housing 11 is stored. The carriage 12 has a transparent platen 14 on which the originals for copying face down be placed downwards. Above the support plate 14 is an opaque movable upper part 16 is provided, which has a white surface which faces the support plate 14. The top 16 is connected to the carriage 12 on one side. In the preferred In the embodiment, the upper part 16 consists of a relatively flexible material held by a hinge or joint with one the longer sides of the carriage 12 is connected. Opposite to The hinged side of the upper part 16 has a handle 17. The handle 17 is used to raise and lower the upper part 16 by the operator when an original is placed on the platen 14 or is to be taken from there.

The carriage 12 takes the basic position in the illustration of FIG that is on the far right in the viewing direction. in the During a copy run, the carriage moves in the viewing direction left for a predetermined distance long enough for the copier to make 10 fourteen inch (355 mm) copies Can make originals. Below the car is a light

Job

(130015/0090

place, which is generally designated by the reference number 20 is provided. The illuminated point has a relatively narrow, translucent one Window 27, which is arranged on the top 19 of the housing 11 is. The window 27 extends in the width of the top I9. No light source is effectively arranged below the window. The light source comprises two lamps 28 which are aligned in the axial direction and which are partially supported by a profiled reflector 30 are surrounded, which serves to emit the light emitted by the lamps 28 to point at the window 27. In the course of in the ^ e direction of view right-to-left movement of the carriage 12 is the Original located on the carriage passed over the window 27 used to illuminate and illuminated with the light of the lamps 28. In other words, the original is over the spot 20 subjected to scanning illumination.

An image of the original is made on a general basis with the Reference number 35 designated sealing point on a photoreceptor tape 40 transferred. The image is transmitted along a Z-shaped path through an optical system 21 comprising two inclined Mirrors 22 and 26 and a lens 24. An image of the illuminated original falls on the mirror 22 when this is over the Window 27 moved away. The image is reflected from the mirror 22 to the lens 24, a collecting lens. The lens 24 is on the second inclined mirror 26, which in turn focuses the focused image on a located at the AbIichtungstelle 35 Part of the photo gate ze ρ torbande s 40 is reflected. The photo receptor belt 40 passes through the photographic point at a predetermined speed in synchronism with the movement of the carriage 12 as it passes through the illumination point 20. The driving force for the rotary movement a drive roller 42 is driven by a main motor 62 via a suitable Drive system supplied, which has a (only partially shown) Engines drive chain 6l. The drive chain 6l also drives others Organs, such as a magnetic brush 37, the carriage 12, a conveyor roller 46 and two retard rollers 48 · A second motor 63 is used for driving control cams 64 and pressure fixing rollers 54

As already mentioned, the photo receptor band is 40 below the Z-shaped optical system 21 from a drive

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roller 42 of relatively large diameter and carried by a tension roller of relatively small diameter. The drive roller 4 ² and the tension roller 44 are diagonally offset from one another and their respective axes are arranged in an angular position to one another, ie the axes are canted or not arranged parallel to one another. Thanks to the relative size difference between the drive roller 42 and the tension roller 44, the photoreceptor belt 40 assumes a shape similar to that of a teardrop. As such, the photoreceptor belt 40 has an upper photosensitive layer, preferably consisting of zinc oxide (ZnO), which is coated on a conductive substrate, which is preferably a metallized polyester film, for example an aluminum-based mylar film.

Around the circumference of the photo gate zep to rban de s 40 is one Number of components required for operation of the copier 10 are arranged. In particular, a two-wire corona charger 52 is shown in FIG Compared to the photo gate zep torband 40 arranged, namely approximately in the introduction position with respect to the drive roller 42 » seen in the direction of view of FIG. The corona charger 32 is used to torbande on the zinc oxide surface of the photoreceiver s 40 to apply a uniform electrostatic charge. the Drive roller 42 rotates clockwise in the viewing direction, so that the evenly charged surface of the photoreceptor belt from the corona charger 52 to the sealing site moved. With the illumination point is a wing-like lock 34 functionally connected. The shutter 34 is in the copier 10 arranged movably in such a way that he of the operator can be actuated to regulate the amount of light that strikes the photo receptor tape 40 at the Ablichtungstelle 35. Corresponding a well-known photocopying method is the photo to receptor tape 40 electrically discharged in the exposed areas, so that a latent (undeveloped) electrostatic image remains, the the labeling areas (printing parts) of the original to be copied is equivalent to.

In the course of the rotary movement of the drive roller 42, the latent image passed along a development point 36, which in

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With respect to the drive roller 42 in the viewing direction of FIG. 1 is arranged in the three o'clock position. The development center 36 has a loading magazine 39, which has a supply of the tinting agent β contains, in the preferred embodiment of the invention a two-component speaker is used, consisting of iron filings and a pressure-fixable marking material »but can a single component speaker can also be used. Such sounders and development points are known from the prior art and therefore only needs to be dealt with insofar as this their function in the overall context of that carried out with the copier 10 The copying process. It may therefore suffice to say that a rotating magnetic brush 37 tinting agent from the On issue magazine 39 picks up and the sounder with the Pho tore ze ρ torband 40 brings in touch. In the areas of charging or des The toner particles become the latent image on the photo receptor tape electrostatically attracted and held in place, creating the latent image is being developed.

The toned or developed image leaves the development site 36 and moves to the transfer site 50 where a Corona transmission device 51 »d-t two wires is provided. In time with the appearance of the toned JiI des an the corona transfer device 51 meets at the transfer point 50 also insert a copy sheet. The copy sheet is made from a Copy sheet supply 45 supplied, which is stored in a pull-out compartment 102. A conveyor roller 46 serves to guide the uppermost Copy sheet from the copy sheet supply 45 via a paper guide 47 in the nip of the retardation rollers 48 · To a predetermined At this point in the course of a copy cycle, the deceleration rollers are used 48 for advancing the copy sheet along a paper guide 49 until it contacts that carried by the photoreceptor belt 40 developed image. Thanks to the corona transmission facility 51 generated electrical charge, the toner particles are now attracted by the photoreze ρ torband 40 in the direction of the copy sheet, to which they now loosely cling.

The copy sheet is from the photo to receptor belt 40 through the Cooperation of the tension roller having the small diameter

separated with the relative stiffness of the copy sheet. In other words, when the photo receptor belt runs around the tension roller 44, the copy sheet no longer follows the photo receptor belt 40. Instead, the leading edge of the copy sheet is now moving away from the photoreceptor belt along a path that is initially tangential to tension roller 44. The copy sheet is finally fed to the nip of the pressure fixing rollers 54 ^{by a paper guide 5 2.}

The pressure fixing rollers 54 are two rollers made of stainless steel which are spring loaded for mutual contact with a linear pressure of approximately 53 »58 kg / cm. The axes of the pressure fixing roller η 54 are slightly canted against each other, to keep the rollers in contact. Otherwise, the fuser rollers would have a tendency to deform, causing the Terminal point a gap would arise. The speed of rotation the pressure fixing roller 54 is sized so that the speed of a copy sheet is slightly less as it passes through the rollers is as dit, - speed of feeding the copy sheet to the Pressure fixing rollers. This is necessary to ensure that the pressure fixing rollers Do not remove the copy sheet prematurely from the photo receptor tape 40, i.e. before transferring the speaker to the Copy sheet has ended, creating a poor, streaky copy would arise. The copy sheet can therefore bulge a little before it is completely passed through the pressure fixing roller η 54. Such a slight bulge does not damage the initially loosely adhering toner image carried by the copy sheet. Under the action of the pressure fixing rollers 54 on the pressure fixable With the high pressure applied, the image is permanently fused on the copy sheet as it fuses the pressure fusing rollers 54 on the way to the Collection compartment 56 passes through.

After the developed image has been transferred, a latent electrostatic remains on the photo gate ze ρ gate tape 40 Residual image and a certain portion of the driver that was not transmitted. While the photo gate ze ρ torband 40 continues on its way, happens there is a corona discharge device 58 with a single wire to which

030015/0890

neutralizes any charge still present on the driver that has not been transferred will. Next, the photo receptor belt 40 runs under one Series arrangement of image erase lamps 60 in the form of (preferably four) light bulbs through. The light of the picture erase lamps 6o illuminates the photo receptor belt 40, causes a discharge of the latent Be etbildbe rich on the photo gate tape 40 and thus erases something still existing electrostatic best image.

While the photo receptor belt 40 is now starting the second cycle, the return of the carriage 12 begins from the position on the far left in the viewing direction to the position on the far right Position or the basic position. During the second round, the corona charger 32 and the corona transfer device 51 are in place put out of service. Due to the way the picture erase lamps 6o and the corona discharge device 58 adheres to the untransferred Now only loosely attach the driver to the photo receptor tape 40. If the If the sounder that is not transmitted reaches the magnetic brush 37, it will not transferred tint from the photo receptor tape 40 to the magnetic brush 37 tightened. The magnetic brush 37 therefore has a double Puncture-wise: during the first cycle the magnetic brush 37 develops cleans the electrostatic latent image and on the second cycle the magnetic brush 37 does not remove the photo receptor tape from any still present transferred proportions of the tint. After the second round the Pho tore ze ρ torband 40 is then cleaned of the tweeter and ready for use to make a new copy.

As can be readily seen from Figure 1, most of the major operational components of copier 10 are intermediate between the two Arranged at the ends of the Z-shaped beam path, i.e. between the inclined mirrors 22 and 26. In particular, the photo is receptor tape 40, the corona charger 32, the developing station 36, the corona transfer device 51 »the corona discharge device 58 and the Image erasing lamps 60 all within a relatively compact volume of space housed, which is limited in a vertical view of the web ends of the Z-shaped optical system. The design of the optical system thus interacts with the spatial arrangement of the main control elements in the sense that a Simple paper copier of compact dimensions ve rhäl tni a se η created

030015/0890

In addition, the above-described enables optical System 21 a significant reduction in what is usually used for bracing of the reciprocating carriage 12 required structure. The relatively light construction of the arrangement for supporting the carriage 12 is shown in Fig. 8, it can be seen that one side of the Carriage 12 is mounted on a guide rail 80 which has an upper slide groove 81a and a lower slide groove 81b. Several sliding displaceable mounting brackets 82 each have two grooves 8 3a and 83b facing the sliding grooves 81a and 81b, respectively. Several Bearing balls 84 rotate freely in the mutually facing sliding grooves 81a and 81b and grooves 83a and 83b, respectively. Multiple joints 85 (viz one hinge for each bracket) are at one end with the one side of the support plate 14 connected and at the other end with one of the mounting brackets. An immovable slide rail 86 is used to support that side of the support plate 14 that the hinged Side is opposite. In the preferred embodiment is the support plate 14 here is 419 mm long and loads as it moves by no more than 255 now via the copier 10. Such A relatively small overhang is achieved in that the window 27 serving for illumination is removed from one of the ends of the copier And not far from the middle part of the upper side of the Copier 10 is provided. As mentioned earlier, the arrangement of the window remote from the end face of the copier becomes 27 with unrestricted maintenance of the functional tasks by the Z-shaped optical system allows.

The upper support structure will now be described. For this purpose, reference is made to Fig. 2, which is one of the by the invention Mediated advantages can be seen with regard to the upper support structure 70. The following components are attached to the upper support structure 70 mounted: the carriage 12, the window 27 serving for illumination, the Z-shaped optical system 21, the serving for illumination Lamps 28 and reflector 30, corona charger 58, the array of image erase lamps 60, corona charger 32 and the shutter 34 · The upper support structure is by an elongated C-shaped support arm 7I is hinged to a central housing 90. Of the

middle

OS001S / 089Ö

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middle part of the support arm 71 is fixed to the underside of the in the i3e direction of view on the left side of the cattle of the upper support structure s tied together. The two ends of the support arm 71 are connected to the respective vertical parts of the upper support structure and the central housing 90 connected to perform pivoting movements

A pneumatic support J2 comprises a gas pressure cylinder 73 and an extension rod 74 which is hinged at one end to the central housing 90 and at the other end to the upper support structure 70. When the upper support structure 70 is raised to access the copier 10 To achieve this, the pneumatic support 72 holds the upper support structure 70 in the raised position, as shown in FIG. 2. If the upper support structure 70 is then lowered again into the working position, the extension rod is drawn into the gas pressure cylinder 7i.

We shall now go into more detail about the central building. Within the central housing 90 of the copier 10 are the Most of the other components required for operation are arranged. The one Side of the central housing 90 has a (not shown) casting that acts as a boom support for one end of the drive roller 42 acts. On the support of the other end of the drive roller 42 will have to come back. Apart from the components mounted on the lower support structure 100, the remaining components are suitable Way in the mutual positions shown in FIG built into the central housing 90.

The lower support structure is shown in FIGS. 5A, 5B, 6a and 6B and comprises a pull-out drawer 104> consisting of two roughly triangular-shaped side walls 105 and 106, a base plate 107 and an end plate 108. The side walls 105 and 106 are on the base plate 107 i ⁿ fixedly arranged at a predetermined distance from the relevant edge edges. Control surfaces 95 and 96 are provided between the respective side wall 105 »106 and the corresponding marginal edge of the base plate 107. The control surfaces 95 and 96 serve a number of purposes which will be discussed later. The drawer I04 can be pulled completely out of the copier 10 by using a handle provided as part of the end plate 108

Ö30015 / 03ÖA

109 grasps and attracts.

As mentioned above, the drawer carries

104 a number of components required for operation, which are below the Photoreceptor belt 40 are arranged. The corona transmission device 51 extends across the front flattened ends the side walls 105 and IO6 on which it is supported. There are two opposite, elongated U-shaped slots 110 and 111 are provided, which are arranged behind the corona transfer device 51 are, namely a slot for each of the side walls 105 and IO6. the Deceleration rollers 48 are mounted in the slots 110 and 111 and arranged. The ends of the retard rollers 48 are each of one Spring 112 or II3 on the relevant one of the two side walls

105 and IO6 spanned, whereby the retardation rollers held together will. A drive gear carried by one of the rollers 114 protrudes beyond the spring 112 for actuation connection with a Clutch CL2, which can optionally be used to transmit the drive effect can serve from the main motor 62 to the deceleration rollers 48, when a copy sheet is in the position of contact with that of the Photo receptor belt 40 carried developed image are promoted target.

The pull-out tray 102 for the copy paper is also carried by the drawer 104. The pull-out compartment 102 is positioned generally at an angle of approximately ten degrees from the horizontal. In such an angular position, the copy sheets located in the pull-out compartment press against the front wall 10 3 of the pull-out compartment due to their own weight. The side walls 101a and 101b of the pull-out compartment 102 have recesses 99a and 99b near the front wall 103. These recesses 99a and 99b engage lips 115a and 115b, respectively, which are arranged on the inner sides of the side walls 105 and I06 of the drawer. In the base plate 107, an opening is provided to allow the sliding shelf 102 may be arranged so that the recesses 99a and 99 ^b correspond to the lips 115a and 115b. In this way, the pull-out compartment 102 is mounted at an angle of approximately ten degrees.

The drawer 104 also carries the conveyor rollers 46 for the Copy sheets. Two more U-shaped slots Il6a and Il6b are in

Ö3001S / 0890

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the side walls 105 and 106 of the drawer are provided. The axis The conveyor roller 46 extends transversely to the drawer 104 and is mounted on the side walls 105 and IO6 in the slots Il6a and Il6b. At one end, the axis of the conveyor roller 46 carries a chain wheel 117. A clutch CL3 (not shown) is used for optional purposes Coupling of the sprocket 117 to the main motor 62 when read on top lying copy sheet are conveyed from the copy sheet supply 45 target. The pull-out tray 102, which contains the copy sheets, is disposed below the feed roller 46 so that when actuated the respective uppermost copy sheet from the copy sheet supply 45 is fed to the clutch CLJ.

As already mentioned, control surfaces 95 and 96 are provided along the outer edges of the base plate 107. A tension roller actuating rod 120, also shown in FIG. 3A, has an angle support 121 which is pivotably mounted at its corner on the support wall 130 of the magnetic brush arrangement. A roller 122 for engaging the control surface 95 and for running onto this control surface is connected to one end of the angle bracket 121. The other end of the angle bracket 121 is pinned to a connecting arm 123. A Spannwal ze ns te 11 rail 124 extends behind the idler roller 44 i the transverse direction ⁿ in the width of the copying machine The upper end of Sp annwal ze η β te 11 rail 124 is arranged between two inner walls I70 and 171 "of which this is worn, pivoted. The lower end of the tension roller adjusting rail 124 is pinned to the connecting arm 123. A short connecting link 125 is pinned at one end to the tensioning roller adjusting rail 124, while the other end of the connecting link 125 is connected to the axis of the tensioning roller 44. Another short connecting member 126 mediates the connection between the other end of the tensioning roller 44 and the corresponding end of the tensioning roller adjusting rail 124 in a similar manner 126 is loaded in such a way that the connecting member (and with it the tension roller 44) is pressed in the direction which is indicated in FIG. 5B by the directional arrow 128.

030015 / OÖflO

When it is inserted in the operation d --- s drawer 104 lnuft the hell 122 to the control surface 95, whereby the angle bracket 121 in the SSE trach tungsri rect of Fig. 3A and Fig. 5A and 5B in a clockwise direction about its pivot point is pivoted · Depending on the pivoting movement of an angle bracket 121, the connecting arm 123 is moved in the direction of the tensioning roller 44. The movement of the connecting arm 123 is shared via the tensioning roller part rail 124 and the short connecting links 125 and 126 on both sides of the tensioning roller 44. The tension roller 44 is therefore moved as indicated by the direction arrow 128, so that the photo receptor belt 40 is tightened accordingly and that the axis of the tension roller 44 is tilted a little with respect to the drive roller 42. The corresponding inclination or tilting is achieved thanks to the mounting of the axis of the tensioning roller 44 in end slots in the inner walls 170 and 171, which are provided with a mutual height difference. It is obvious to a person skilled in the art that there are several equivalent methods for producing the same tilting effect.

The angle support 121 also serves to guide the feed magazine 39 ″ ½ of the magnetic brush into the working position on the photo receptor belt 40 and to move it out of this position. As can be seen from the illustration in FIGS. 6A and 6B, the feed magazine is 39 is mounted on a sliding plate 140. Ede sliding plate is in turn slidably mounted horizontally between two inner support walls I30 and 131 for the feed magazine with the magnetic brush. A vertical flange 141a protrudes from the sliding plate 140 downward between the vertical flange 141a of the sliding plate and one from the lower part An elongated leaf spring 142a is inserted into the inner support wall 131 upwardly protruding from the bottom flange 143a. When the drawer 104 is pushed in, the angle support 121 presses against the leaf spring 142a, whereby the slide plate 140 is loaded against the photoreceptor belt also on the other side of the sliding plate 140 provided, as can be seen from the illustration of FIG. 3A. When the drawer 104 is pulled out, the leaf springs accordingly load the slide plate (and therefore also the feed magazine 39

Magnetic brush

090015/0890

Ζ3

uagne brush) to move away from the photo gate ze ρ hinge 40.

The other cam effects produced by drawer 104 are also illustrated in Figures 6a and 6B. The curved control surface 97 is carried by the base plate 107 of the drawer 104. One end of a tapered support arm 135 is pivotably mounted on the inner support wall 131. The other or pointed end of the support arm 133 is pressed by the control surface 97 into a notch 134 provided in the end support 135 of the drive roller 42. The other end of the drive roller 42 is held in a cantilevered manner by an axle 136 which is rotatably mounted on a housing plate 137, which is a further inner wall.

The correct position of the pull-out tray 102 for the copy paper is fixed by a retaining clip 150, as shown in FIGS. 7A through 7C is shown. The retaining clip 150 is pivotable on the drawer 104 supported and has a resilient arm 151 which against the side wall 101b of the pull-out compartment 102 presses. In the side wall 101b is a recess 152 is provided for receiving the resilient arm 151, so that the control surface engages through a wall opening 180 and strikes against the housing 11, thereby further moving the pull-out compartment 102 is prevented. The operator feels one here Resistance and then knows that the pull-out compartment 102 is properly inserted. The resistance of the arm 15I is easily overcome so that the pull-out tray 102 can be easily pulled out to replenish the copy sheet supply or to change the paper size.

A support curve 155 provided on one side of the drawer 104 enables the operator to partially pull out the drawer 104 up to a central position in which the photo gate zep torband 40 (as shown in FIG. 6b) is relaxed and in which the magnetic brush from which photo gate zep hinge 40 has moved away. As can be seen from FIGS. 7D to 7F , the mounting curve 155 is pinned at one end to the base plate 107 of the drawer 104. A spring 159 (FIG. 7A) connected to the mounting curve 155 loads the mounting curve in the sense of an outward movement or a movement running clockwise in the viewing direction.

030015/0880

supply. The housing 11 has a wall opening 180. When pulling out of drawer 104 becomes the leading edge of bracket 155 pressed into the wall opening 180. As a result of the curved shape However, the front edge slides out of the wall opening again and the drawer can be pulled out until a projection l6l in the Wall opening 180 engages and comes into contact with housing 11. In this position, the photo receptor belt 40 is relieved or relaxed and the magnetic brush has withdrawn from the drive roller 42. If the operator intends to pull the drawer 104 all the way out, pressure on the front edge of the mounting curve 155 'is sufficient the projection l6l in the viewing direction counterclockwise is pivoted and emerges from the wall opening 180, so that the entire drawer 104 can now be easily removed.

The control system will now be explained. The control system 200 (shown in Figure 9) includes a motor feed and lamp shell device 201, a clutch control circuit 202, an extinguishing lamp circuit 203 and a feed circuit 204 · The copier 10 can can be fed from any 115-volt alternating current connection. Between the AC power source and the copier is connected to a fuse Fl. A safety circuit breaker SL has switch arms SLA and SLB which open when the upper support structure 70 is raised. Of the The main motor 62 and the i / otor 63 are controlled via the contacts KL-I and Kl-2 a main relay Kl fed. The lamps 28 used for illumination are fed via a switch S2 and a triac ignition circuit 205.

The remaining parts of the control system 200 are via a transformer T1 and via full-wave rectifier bridges B1 and B2 a DC power supplied. In particular, be out of the exit the full-wave rectifier bridge Bl fed the image erasure lamps 60, which always remain switched on when the copier 10 is in operation, but also corona high voltage supplies B3. B4 and B5.

From the corona high voltage supply parts B3, B4 and B5 the corona charger 32, the corona transmitter 51 and the corona discharge device 58 is fed with direct voltages, while also applying a DC bias to the magnetic brush 37 is given. A considerable reduction in the size of such equations

power supply parts

030015/0800

293979b

Power supply parts is achieved by using a β High frequency oscillator circuit 206. Two transistors Q5 and Q6 are connected to their emitters, while they are connected to the respective Base on opposite ends of the primary side of a hysteresis transformer T2 are placed. The secondary of the hysteresis transformer T2 is with power transformers T3, T4 and T5 for the Corona devices connected in which the high AC voltage output the Hy steresis transformer T2 is further transformed, whereupon it is rectified in the corona high voltage supply parts B3, B4 and B5 so that DC voltages of -6.5 kV, 5> 5 kV and -5.5 kV on the corona charger 32, the corona discharge device 58 or the corona transmission device 51 can be given. A potentiometer Pl supplies the direct current bias in the amount of -350 V for the magnetic brush 37 · Between the hy steresis transformer T2 and the power transformers η T3 and T5 for the corona charging unit and the corona transmitter are switches S8 and S9, respectively laid for controlling the corona charging unit 32 or the corona transmission device 51 serve. DLe corona discharge device 58 remains practically during the entire operation of the copier 10 switched on.

The remaining control functions for the copier iq _s j.nd are located in the clutch control circuit 202. The copier 10 has four electromagnetic clutches CL1 to CL4. The clutch CL1 is used to couple the main motor 62 to the drive chain 61. The clutch CL2 for the paper feed couples the conveyor roller 46 for the copy sheets to the drive chain 6l. Accordingly, the clutches CL3 and CL4 are used to couple the deceleration rollers 48 and the drive roller 42 to the drive chain 6l. The four clutches CL1 to CL4 are shown schematically as coils in the clutch control circuit 202. Each coupling has a current path or several current paths which can be used to excite the couplings, as will be explained in more detail below 30II.

The main relay Kl is in a similar manner as a coil shown. As already mentioned, the contacts Kl-I and Kl-2 of the main relay Kl for controlling the main motor 62 and the motor

tors 63. A third contact Kl-3 is one Latching contact that controls the main relay KL in the Be actuated state holds as long as the main relay KL is supplied with power.

There are several current paths available on which the main relay Kl can be energized. One of these current paths is through formed a pulse circuit comprising a transistor Ql and two diodes D9 and DlO. Another current path is over a multiple copy r switch S5 is formed when this is in the position MC (Mehrfachkopierbe drive) is turned over. Also via a drive roller control switch S6 and the diode D9, a current path is set up for the main relay KL, as well as via a delay roller switch S7 and a diode D7 · A last current path is established via the drive roller control switch S6 and the diode D9.

A photo transi stör Q3 is arranged on one side below the photo door reception door band 40. The? Ho gatezep hinge 40 has a relatively narrow band incision 8 which is approximately 25 mm long and which is close to the edge of the photo gate ze ρ torbande s as well as arranged outside its mappable control area is. The light emitted by the image erase lamps 60 passes through the Ribbon cut 8 through it and meets the photo transistor Q3. When light falls into the phototransistor Q3, it is switched off, so that the clutch CL4 for the drive roller 42 is de-energized, whereby the photo receptor band comes to a standstill. As the photoreceptor belt 40 should perform two rotations for each copy, the effect of the photo to transistor Q3 on the first rotation is through the Drive roller control switch s6 canceled, which was closed at the time is when the tape cut 8 over the photo to transi disturb Q3 runs away. Another transistor Q2 in clutch control circuit 202 serves a similar purpose as the drive roller control switch S6. In multi-copy operation, a transistor Q4 becomes at Completion of the second revolution of the photoreceptor belt from the Pulsed transistor Q2 so again clutch CL4 to Making the next copy is put into operation.

As can be seen from FIGS. 1 and 8, a set of control cams for actuating a control switch arrangement 66 is rotatably mounted. The switches in the control switch assembly 66 include the

Counter

030015/0890

switch S2 (exposure lamps), switch S4 (conveyor roller for the copy sheets), drive roller control switch S6, delay roller switch S7) switch 38 (corona charging unit) and switch S9 (corona transfer device), with the relevant component in brackets in the copier 10 is called, which is subject to the control action of the switch concerned. The control cams in the control cam set are each eccentrically shaped in such a way that they open and close the relevant switch at a predetermined point in time in the copy cycle. In the course of a copy cycle, the control cams 64 of the control cam set each perform a full revolution or a rotary movement through 360. During this time, the P ho to receptor belt 40 revolves twice. In the preferred embodiment, the photoreceptor belt 40 is eighteen inches (457 mm) long to accommodate copies of the American standard format, and the photoreceiver belt therefore moves 914 mm for each copy. In Fig. 10 is a bar graph is shown in which the operation of the switches in the control switch assembly 66 and the occurrence of critical events to the degrees of rotation of the control cams 64 and the moving distance of the Pho gates zeptorbande s is set in relationship. The bars assigned to the switches show the rotational positions of the eccentric control surfaces of each control cam in a reciprocal relationship.

The drive system of the copier 10, which is shown in FIG. 8, will now be discussed in more detail. As already mentioned two motors are provided, namely the main motor 62 and the totor 63 for the burn-in rollers or pressure-fixing rollers. The latter Motor is used to drive the pressure fixing rollers 54 via a Drive chain 182 which goes around a drive sprocket 183 of the pressure fixing rollers and is guided around an IvIotorkettenrad 9. The magnetic brush 37 is also driven by the motor 63 for the pressure fixing roller η, by means of a drive sprocket 13 coaxial with the drive sprocket 18 3 is mounted for the pressure fixing rollers. Of the The output of the drive sprocket 13 is transferred to a drive sprocket 15 for the magnetic brush via a drive chain 57 and an intermediate wheel or chain idler 185 transferred.

Π30015 / 0890

The ϊ / agen 12 and the other driven parts are from driven by the main rotor 62. A wagon drive chain 65 is up two sprockets 69a and 69b passed around, each on the respective Are arranged at the end of the carriage track. A yoke 67 is connected to the carriage and an IiLtnehraerstift 68 is connected to the yoke 67 in is movable in the perpendicular direction is with the carriage drive chain 65 connected. The drive shaft of the main motor 62 carries in coaxial Arrangement of a sprocket 69a for the carriage drive. When the main engine 62 runs, the carriage drive chain 65 moves around the two Sprockets 69a and 69b. The Mi tnehmerstift 68 takes this (firmly yoke 67 connected to the carriage 12 during the movement of the carriage drive chain 65 with. When the driver pin 68 is one of the two chain wheels 69a and 69b, the car is first slowed down, whereupon its direction of movement is reversed, so that it is a back and forth Performs float.

The Antriebke tts 6l provides the drive for the other driven parts. The conveyor rollers 46 for the paper feed are connected to the drive chain 6l via two meshing spur gears 23 and 25 which are driven via a chain wheel 1 and the clutch CL2. In a similar way, the deceleration rollers 49 are also connected to the drive chain 61 via two spur gears 31 and 33 which are driven via a chain wheel 2 and the clutch CL3. A chain wheel 43 supplies the drive for the large-diameter drive roller 6, 2 via the clutch CL4. The set of control cams 64 located on the output side of an S curve expensive nke ttenrade β and is driven via coaxial reduction gears 3 ^au nd 3b. The wheel base is designed so that the control cams 64 perform a full revolution while the photo gate ze ρ gate belt 40 rotates twice.

■ "Let us now go into more detail about the operational processes. When the copy switch S3 is closed, the transformer Tl powered so that the image erase lamps 60 and the corona discharge device 58 were put into operation and the DC bias of -350 V is applied to the magnetic brush 37. In the coupling Expensive circuit 202, the clutch CLl is energized. In addition, the Transistor Ql through the resistor R7 and the capacitor ClO

e y nbe gre j f e nde

030Ö15 / 08ÖÖ

Comprehensive RC circuit for a period of about 400 milliseconds controlled in the switched-on state, namely until it is charged of the capacitor ClO up to its capacity. While the transistor Ql is switched on, the main relay Kl via the diodes D9 and DlO fed. As a result, the three contacts of the Main relay Kl, so that the main motor 62 is fed via the contact Kl-I is, the motor 63 via the contact Kl-2 and the transformer Tl now via the contact Kl-3. The clutch CL4 for the drive roller is also via the transistor Ql and the diodes DIl and DlO excited. The main motor 62 is thus put into operation, the Car begins its movement in the direction of the illuminated area and above away and the photo receptor belt 40 runs around, as well as the set of control cams 64.

After the control cams 64 have rotated by 6 (corresponding approximately to a distance of the photoreceptor belt 40 from approximately 12 mm), the switch S2 closes and the lamps 28 used for exposure are put into operation.

It has already been mentioned that the transistor Ql switches off as soon as the capacitor ClO is fully charged. The cam operated Drive roller control switch S6 is accordingly for switching after a 5 ° rotation set before the capacitor ClO fully discharges to create a second and permanent current path for the main relay Kl and to make the clutch CL4 available for the drive roller so the photoreceiver belt 40 moves over its intended range of motion can move on.

After a 10 ° turn, switch S4 switches for the Copy paper feed, which activates the clutch CL2 for the paper feed is excited. The feed rollers for the copy paper begin to run and transport the top copy sheet into the nip of the still unactuated retardation rollers 48. The switch S4 opens after a 38 ° rotation, so that a copy sheet bulges slightly between the feed roller 46 for the copy paper and the Kiemmetelle of the retardation rollers 48 remains.

After a 21 ° turn, the switch S8 switches for the corona charging unit 32, so that it is connected to the DC power supply

030015/0890

is fed with -6.5 kV. If the photoreceptor belt now passes under the corona charging unit 52, the photosensitive zinc oxide layer is consequently charged uniformly. 7 / ie from the above description, the image of the original carried over the exposure slit in the form of the window 27 is ^{thrown at the photographic point 35 a} ^ f the charged photo gate zep torband 40. The exposed areas of the Pho torezeptorbandes 40 are discharged, so that a latent electrostatic image is formed. Wenr; This image passes under the magnetic brush 37, toner particles are attracted, which adhere to the electrostatic charge image, so that this image is made visible or developed therewith.

Whom; the developed image is sent to the transmission center 50 and when the control cams have turned 100, it switches Delay roller switch S7 > So that the clutch CL 3 for the deceleration rollers is excited. That already in the nip of the deceleration rollers 48 inserted copy sheet is now transported by the retard rollers 48 in synchronism with the developed image, so that the image and the copy sheet the transfer station 50 in one Reach and run through mutual leakage position. While the image and the copy sheet are now at the transfer point 50 approach, the failure S9 closes to control the corona transfer device (Rotational position 116) so that the corona transfer device 51 connected to the DC power supply with -5i5 kV will. At the transfer point 50, the toner particles are thus attracted to the copy sheet and adhere to it while the copy sheet continues its movement and now into the clamping point the pressure fixing rollers 54 enters. Under the influence of pressure the pressure fixing roller becomes the tinting agent on the copy sheet permanently fixed, whereupon this is deposited in the collecting compartment 56.

When the control cams 64 rotate into the rotational positions I65 ⁰ , 180 ° and 185 °, the respective switches S8, S2 and S6 open, whereby the corona charging unit 32 and the lamps 28 used for exposure are switched off, while the current path to the Main relay Kl is interrupted via the drive roller control switch S6. The main relay Kl is meanwhile over the other

Current path

030015/0890

Current path held by the clutch control serving Delay roller switch S7 runs.

The clutch CL4 for the drive roller is held through the phototransistor Q3 and the transistor Q4. It should be remembered here that Q3 is a photo transistor that blocks the transistor Q4 (and therefore brings the drive roller 42 to a standstill) as soon as light strikes this photo transistor Q3. But this is the case when the band incision θ in the photo receptor tape over the photo transi disturbance Q3 runs away. On the inde of the first cycle or the first rotation of the Pho torozeptorbande s 40, the actuation effect of the Photo Transi sto rs Q3 is canceled by the drive roller control switch S6. The drive roller control switch S6 maintains a current path to the clutch CL4 for the drive roller up to the rotation position of 185 °, which is sufficient so that the band incision 8 can be completely led away over the photo transi stör y3. At the beginning of the second revolution of the photoreceptor belt 40, the phototransistor Q3 is thus dark and the drive roller A, 2 continues its rotary movement, while the return of the carriage 12 begins in the basic position. During the second revolution of the photoreceptor belt 40, the transfer process is ended, the switch S9 for controlling the corona transfer device 51 opens and this is de-energized.

It has already been mentioned that the corona discharge device 58 and the image erase lamps 6θ practically for the entire duration of the both revolutions of the photoreceptor belt 40 remain in operation. the Leading edge of the one containing the untransferred tinting agent latent residual image passes under the corona discharge device 58, which neutralizes any remaining charge that is on the Töner was caused by the corona transmitter 51. The image erasing lamps 60 irradiate the photo gate ze ρ gate tape, whereby the latent electrostatic Kestbild is discharged. After the still the remaining tweeter has been neutralized and the photoreceptor has been discharged, there is hardly any power left or no power at all, which hold the remaining speaker on the photo receptor tape 40 could. So if the photo receptor tape is now on the second round moved past the magnetic brush 37, the toner particles become

030015/0890

from the Pho tore ze ρ torband 40, which in this way from the toner particles cleaned, attracted to the magnetic brush.

The photo to receptor belt 40 then continues to rotate until the Bandeinsciini tt 8 runs over the phototransistor Q3. That from Light emitted from the image erase lamps 60 passes through the tape cut 8 and falls on the phototransistor Q3, causing the transistor Q4 is switched off. After transistor Q4 has now turned off is, the remaining current path for the clutch CL4 is now interrupted, so that the drive roller 42 is put out of operation. Next, the delay roller switch S7 opens »whereby the power supply to the clutch CL3 for the retard rollers is terminated is, as well as the power supply of the main relay Kl. The three contacts of the main relay Kl therefore open, so that the contact Kl-I switches off the main motor 62, the contact Kl-2 the luotor 63 and the contact Kl-3 the transformer Tl. By switching off of the transformer Tl is the DC voltage supply terminated by the Vo 11 we ggl ei chri ch te r bridge B1, so that the image erase lamps 60 and the corona discharge device 58 are de-energized. The direct current output of the full-wave rectifier bridge also listens accordingly B2 on, whereby the clutch CLl is opened. This is a combined clutch and brake arrangement, so that all devices driven by the main motor 62 share can now be braked to a standstill.

If several copies are to be made of one and the same original, the multiple copy switch S5 is closed at the beginning of the first cycle of the first copy. The multiple copy switch S5 is a separate control switch that can be switched on and off by the operator; if desired, it can also be combined with one of several known automatic copy number control devices (for example with a pawl arrangement), which the! Making a predetermined number of copies opens. In any case, however, the main relay Kl remains energized via the multiple copy switch S5 when the multiple copy switch S5 is switched to the LC position (multiple copy position) until the cycle has ended, whereupon the multiple copy switch S5 opens

0300 15/0890

will. Similarly, the ground path to the base of transistor Q2, the normally se by the Mehrfachkopierschal ter S5 in its position SC (single copy position) is maintained, now open, so that transistor Q2 can be pulsed like this will be explained below.

When Liehrfachkopierbe are operating essentially the individual copying processes repeated in succession. But that remains Main relay KL at the end of the second cycle of the photoreceiver strip 40 » when the delay roller switch S7 switches to the open position, via the multiple copy switch S5 in its position MC formed current path is excited. In addition, opening the Delay roller switch S7 in a 100 ms pulse, which is from the Induction coil of clutch CL5 and capacitor C9 is generated. The 100 ms pulse is applied to the base of transistor Q2, the in turn applied a pulse to transistor Q4, whereby the clutch CL4 is energized so long that the band incision 8 over the Pho to tear disruptive Q3 can run away, which has a similarity with the process of applying pulses to the clutch CL4 by the Transistor Ql when initiating single copy operation. After the Band incision 8 led away over the phototransi disturbance Q3 and this is darkened again, transistor Q4 is on, so that the clutch CL4 is fed without interruption. The phototransmitter Q3 is activated by the drive roller control switch on each subsequent copy S6 blocked as in single copy mode. When the last copy is made, the multiple copy switch S5 is set on the second cycle of the photo gate hinge 40 in the position SC (single copy position) knocked down. When the multiple copy switch S5 is set to the SC position is, the base of transistor Q2 is grounded, whereby the Impulseing of the transistor Q4 is prevented by which the clutch CL4 could be re-energized. By opening the multiple copy switch S5, the other earth path is also to Main relay Kl interrupted, so that the main relay Kl is de-energized and the device comes to a standstill as in the case of Einzelkopierbe, if now the delay roller switch S7 is opened.

Claims

030015/0890

Claims (21)

tent claims / 9yv »ν Ο 1. ilektrophotokopiergerät in the form of an 11 schkopiergeräts for reproduction one & opie from an original on a copy sheet by a drive roller (42) with a relatively large diameter, a tension roller (44) with a relatively small diameter, a photoreceptor belt (4C) embracing a conductive substrate, the outer surface of which is coated with a photoconductive substance is, wherein the photo to receptor band (40) for locomotion along a predetermined movement path in a movable arrangement carried by the drive roller (42) and the tension roller (44), means in the form of a main motor (62) for driving the photoreceptor belt (40) along the predetermined movement path, medium in the form of a window (27) and several lamps (28) for lighting an original, a reciprocating carriage (12) for guiding an original over the ones used for lighting jili t te 1, several arranged near the large drive roller (42) means in the form of a corona charger (32) for charging the photoconductive Surface, an optical system (21) for imaging the illuminated original on the charged photoconductive surface to form an electrostatic latent image and one Magnetic brush (37) for tinting the latent image while making it visible of the image, means in the form of retardation rollers (48) for conveying a copy sheet in contact with the toned image on the photo gate tape (40), a transfer means in the form of a Corona transmission device (51) for the most extensive η transmission the toned image from the photoreceptor belt (40) onto the copy sheet and vibrators in the form of pressure fixing rollers (54) for pressure fixing of the toned image on the copy sheet, with the pressure fixing rollers (54) operationally with respect to the relative Small diameter tension roller (44) for taking over the Copy sheet when it is detached from the photo gate zep gate tape running around the tension roller (44) having the small diameter (40) are arranged. 2. Kiek tropho tokopie rge advises according to claim 1, characterized in that that the means used for illuminating have an exposure slit encompass in the form of a window (27) through which the original Π3ΟΟ1Β / Ο89η ORIGINAL INSPECTED nal can be illuminated, while the means used for imaging a Include optical system (21) that has a Z-shaped beam path which extends from one end to the exposure slit in ibrm of the window (27) to the other end on the large drive roller (42) extends, wherein the beam path extends substantially the same length as the Pho gate ze ρ torband (40), which is used for Charging means in the form of the corona charger (32), the lamp serving for tinting in the form of the magnetic brush (37) and the Transmission means in the form of the corona transmission device (51) and wherein the beam path is provided above it. 3. Electrophotocopier according to claim 1, characterized in that that extinguishing and neutralizing agent in the form of a corona discharge device (58) and in the form of image erase lamps (60) for erasing of the latent image and to neutralize untransferred Proportion of loudspeakers in terms of actuation close to the photo gate ze ρ hinge (4θ) along the predetermined path of movement and in the direction of movement behind the transfer means in the shape of the corona transfer device (51) are arranged, with non-transmitted, neutralized tones by the means serving for tinting in Form of the magnetic brush (37) from the photo to receptor tape (40) at Running the photoreceptor belt (40) over the magnetic brush (37) are removable and the photo gate zep torband (40) can thereby be cleaned in preparation for making a subsequent copy. 4. Electrophotocopier according to claim 3> characterized, that the copier (10) has a hinged upper support structure (70) for the common support of the means used for lighting in the form of the window (27) and the lamps (28), the ones used for imaging la ttel in the form of the optical system (21), the deletion and Neutralizing agent in the form of the corona discharge device (58) and the image erase lamps (60) and the means for charging in the form of the corona charging unit (32), the upper Support structure (70) to allow access to the photoreceptor belt (40) and the tinting agent in the form of the magnetic brush (37) can be opened in a pivoting movement. 5. Electrophotocopier according to claim 1, characterized in that 030015/0809 that means for angular displacement of the axes of the drive roller (42) and the tension roller (44) are provided with respect to one another, the photo gate ze ρ gate belt (40) for performing a lateral movement in a predetermined direction towards one end of the Drive roller (42) and the tension roller (44) during the port movement of the photoreceptor belt (40) along its predetermined path of travel is resilient. 6. Electrophotocopier according to claim 5, characterized in that that one of the drive roller (42) or the tension roller (44) endsei tig supported Fl is provided on sch arrangement against which the Photo to receptor band (40) is movable in the lateral direction and through which the Pho gate ze ρ gate tape (40) in a predetermined position is durable. 7. Electrophotocopier with means for illuminating an original, means for moving the original back and forth movable along the means used for lighting, one for locomotion along a predetermined endless path of movement arranged photo to receptor band, several close to this trajectory arranged means including a means for charging the photoreceptor belt, a means for exposing the photoreceptor belt with an image of the illuminated original under production of a latent image on the photo receiver tape, a Means for toning the latent image and an agent for transferring of the toned image on a copy sheet, indicated by a control system (200) for making a copy of the original with two revolutions of the photoreceptor belt along (40) its predetermined trajectory, comprising a means in the form a clutch control circuit (202) for advancing the photoreceptor belt (40) over two revolutions along the predetermined movement path and means in the form of a motor supply and lamp circuit (201) and a feed circuit (204) for feeding the for lighting serving means in the form of lamps (28) and the for charging means in the form of a corona charging unit (32) during the first cycle and for switching off the lighting serving means and the means serving for charging in the second round. ti. Electrophotocopier according to Claim 7, characterized in that the control system (2CC) has a shaker in the form of a feed circuit (204) for feeding the cloth used for the transfer in the form of a corona transfer device (51) after the first revolution of the photoreceptor belt (4ü ) and a means to switch off the zurr. Transfer serving agent engages before the end of the second revolution of the photoreceptor belt (40). 9. Klektrophotokopiergerät according to claim 7 »characterized in that that in the direction of movement behind the one serving for transmission Means arranged in the form of a corona transmission device (51) Means in the form of a coronae η ti a de ei nri rect (58) and in Form of image erasing lamps (60) for erasing the latent image and for neutralization still remaining on the photo gate ze ρ hinge (40) Loudspeaker components are provided, the control system (200) means in the form of an extinguishing lamp circuit (203) and a feed circuit (204) for feeding the gowns used for extinguishing and neutralizing practically during the entire duration of both circuits of the photoreceptor band (4o), whereby the latent Image is erasable and the non-transmitted speaker components can be neutralized and the non-transmitted speaker components during the second round of the Pho tore zeptorbande s (4θ) in preparation the making of a subsequent copy can be removed using the tinting device in the form of a magnetic brush (37). 10. Electrophotocopier according to claim 7, characterized in that: that the control system (20C) interacts with the photoreceptor belt (40) encompasses hooking means connected to this for joint movement in the form of a band incision (θ), furthermore sensing means in the form of picture erase lamps (60) and in the form of a Phototransi stors (Q3) to perceive the passing of the ,. arkierungsmi ttels at a predetermined point and on the sensing means appealing and effective with the to move the Pho tore zeptorbande s (40) serving smock in the form of a main engine (62) connected IvIi ttel in the form of a transistor (Q4) and a Coupling (CL4) to deactivate the photoreceptor band (40) after a predetermined even number of revolutions, wherein the The number of these rounds is twice the number of copies desired is equivalent to 0 % 0 Ö 1 6/0 8 8 A is equivalent to. 11. Elektrophotokoüiergerüt according to claim 10, characterized in, that the on the sensing means in the form of the image erase lamps (6o) and of the photo transistor (Q3) responsive oil the means used for lighting in the form of lamps (28), the litte 1 used for tinting in the form of a Llajjne brush (37), the means for transferring in the form of a corona transfer device (51) and used for deletion and neutralization Vibrate in the form of a corona discharge device (58) and in the form of image erase lamps (60) for switching off the respective means after a predetermined even number of revolutions of the Pho tore ze ρ to rband (40) are connected. 12. Elektropho tokopierge advises according to claim 10, characterized in that that the marking agent is a hole in the shape of a Tape incision (8) in the photo to receptor tape (40) and that Sensing means one arranged on one side of the band incision (8) Light source in the form of one of the image erase lamps (60) and one arranged on the other side of the band incision (8) Including a photodetector in the form of a Pho totransi stors (Q3). 13 · Single paper copier with an one between two for tape storage and for .sand transport along a predetermined endless .Motion track serving rollers carried in a movable arrangement Housing containing photoreceptor belt, a means for tinting a latent electrostatic image on the photo receptor belt, means for transferring the toned image onto a plain copy paper sheet, two retard rollers for conveying one Copy sheet in contact with the toned image on the photoreceptor belt and a compartment for receiving a supply of copy sheets, characterized by a support frame and a frame η in the form a drawer (104), which is used to adjust the position of the copy sheet compartment in the form of a pull-out compartment (102) in a working position can be engaged and disengaged therefrom and that when moving into the working position for the storage and adjustment of the retardation rollers (48) and the means used for the transfer in the form of a corona transfer device (51) in the respective working position fl300i5 / 089fl with respect to the ho tore ze ρ gate hinge (40) can be actuated. 14. Single paper copier according to claim 13, characterized in that that tightening means in the form of an effective with the support and Setting frame in the form of the drawer (104) connected and with one of the rollers in the form of a drive roller (42) and a tension roller (44) for moving one of the rollers in the form of the tension roller (44) when moving away from the other roller in the form of the drive roller (42) when the support and adjustment frame is engaged of the drawer (104) in the working position nste 11 ge rod s (l20) are provided, with the photo to receptor tape (40) is punishable by work. 15 · ^ infachpapier copier according to claim 13, characterized in that that the medium used for tinting is in the form of a magnetic brush (37) for making movements between one for rotating the photoreceptor belt (40) serving first position in accordance with the photo to receptor tape (40) and one of the photo gate ze ρ gate tape (40) removed, allowing the replacement of the photo receptor belt (40) second position is arranged, in operating connection with the support and adjustment frame in the form of the drawer (lü4) Lageabstimrnungsmi tte] in the form of an angle bracket (l2l), in Form of a sliding plate (140), in the form of Ve r ti kai flansche η (l41a, 141b), in the form of leaf springs (l42a, 142b) and in the form of bottom flanges (l 43a, 143b) are provided, which when adjusted of the support frame and frame in the form of the drawer (IO4) in the Working position for engaging the agent used for tinting in Shape of the n.agne tbürste (37) in the position of conformity with the photoreceptor belt (40) are operable. l6. Single paper copier according to claim 13 »characterized in that that of the copier (ίο) to support the rollers in the form of Drive roller (42) and the tension roller (44) carried and in the Working position of the support and adjustment frame in the form of the drawer (104) through the movable drawer (104) to grip the rollers in the form of the drive roller (42) and the tension roller (44) as well as their storage be operable movable means are provided. 17 · Single paper copier according to claim 13 »characterized in that an adjustment curve in the form of a retaining clip (15C) is provided for the paper compartment in the form of the pull-out compartment (102), which is supported by the movable support and adjustment frame in the form of the drawer (104) and has an arm (151) loaded against a notch in the form of a recess (152) in the pull-out compartment (102), the pull-out compartment (102) being able to be brought into an operating position in which the arm (51) of the retaining clip ( Ι5θ) engages in the recess (15 ² ) of the pull-out compartment (102). 18. Single paper copier according to claim 1}, characterized in that that one on the movable support and adjustment frame in the form of Drawer (104) pivotally mounted and for gripping on the housing (II) of the copier (10) when pulling out the drawer (IO4) in a predetermined unbe actuated position against the housing (ll) loaded support curve (155) is provided, wherein the Support curve (155) before fully pulling out the support and adjustment frame in the form of the drawer (104) from the copier (lO) can be disengaged from the engagement. 19. Elektropho tokopiergerät for reproducing a * copy of an original on a copy sheet by transferring a toner image from a photoreceptor to the copy sheet, indicated by a first roller in the form of a drive roller (42), a second roller having a smaller diameter than the first roller in the form a tension roller (44) and a photo receptor belt (4ü) on the The drive roller (42) and the tension roller (44) are movably arranged for movement in a predetermined movement path, wherein the axes of the drive roller (42) and the tension roller (44) are angularly offset from one another and wherein the photoreceptor belt (40) when moving along the predetermined trajectory thereby to perform one in a predetermined direction can be loaded laterally against the one end of the drive roller (42) and the tension roller (44) directed movement. 20. Elektropho tokopiergerät according to claim 19, characterized in that that one of the one of the rollers in the form of the drive roller (42) and the tension roller (44) endsei tig supported flange arrangement is provided is seen against which the Pho gate ρ gate hinge (40) in the side Direction is movable, the photo to rczeg gate hinge (40) essentially can be kept in the same side position. 21. Electrophotocopier according to claim 19, characterized in that that the copier (10) two spaced apart vertical Support walls in the form of two inner walls (170, 171) for rotatable mounting the Y / rolls in the form of the drive roll (42) and the tension roll (44), the drive roller (42) with its axis is arranged perpendicular to these two inner walls (170, 171), while the axis of the tension roller (44) with respect to the drive roller (42) is offset at an angle. Ö3OÖ15 / O890