DE3605472C2 - Electrophotographic copier - Google Patents

Description

The invention relates to an electrophotographic Ko Pier device according to the preamble of claim 1.

An electrophotographic copier of this type is from the DE 25 07 881 A1 known.

The electrophotographic copier described in this document includes
a template area determination device for determining a first and a second template sub-area, where the template area determination device enables the determination of two template sub-areas independently of one another,
Devices for generating charge images of the first and second original partial areas defined by the original area determination device during successive image generation processes,
Key input devices for specifying the respective color with which the charge images of the first and the second sub-area areas are to be developed, and
first and second development devices with different colored developers, which are controlled by a control device in the successive copier operations depending on the respective input of the key input devices for developing the first and the second subarea in different colors.

With the copier described in DE 25 07 881 A1 two template sections can be selected. For each of these before Layer sections are two to the side of the template opening Layered, manually displaceable pointer device instructions for specifying the sub-areas as well as buttons switch for selecting the respective template section assignable color provided.

Copiers of this type, in particular their facilities for Selection of the sub-areas and the selection of the Colors that can be assigned to sub-areas have a com technical structure. Beyond that is yours Use less user-friendly: the made one positions are often inaccurate and / or incorrect.

In the unpublished DE 35 17 397 A1 a Ko described piergerät, which is also a template area-Be mood device for determining template sub-areas and a key input device for inputting the color, in the part of the template to be reproduced is ko should be pierced. However, with the templates area determining means only one front location sub-area and, accordingly, only this Selectable color to assign to sub-area. I.e. if several sub-areas selected from a template and ver to be copied in different colors, the user of the Device do this in several steps, after each  Copy a sub-section of a new setting of sub-area and color must be done.

The invention is therefore based on the object of an electro photographic copier according to the preamble of the patent claims 1 to further develop such that it is simply an open Built control device that allows the for data necessary for the execution of a copy job the start of copying completely and in such a way that the risk of incorrect operation is reduced to a minimum becomes.

According to the invention, this object is characterized by the solved the part of claim 1 claimed features.  

Advantageous developments of the invention are the subject of subclaims.  

The invention is illustrated below with reference to embodiments play with reference to the drawing tert.

Fig. 1 is a sectional view showing the configuration of the copying machine according to an embodiment.

Fig. 2 is a block diagram of a circuit for setting a reproductive speed.

Fig. 3-1 is a perspective view of the copying machine according to another embodiment.

Fig. 3-2 is a plan view of a document platen.

Fig. 4 is a plan view of an operation panel.

Fig. 5 is a block diagram of a display part.

Fig. 6 is a block diagram of an input part.

Fig. 7 is a block diagram of a driver circuit for LED lines.

Fig. 8 is a diagram showing a state when the LED rows are switched.

Fig. 9-1 is a representation of Farbdetektorschaltun gen for developing devices.

Fig. 9-2 shows a memory arrangement which indicates the storage of areas.

Fig. 9-3 shows the contents of a memory when correcting areas.

Fig. 9-4 to 9-7 are flowcharts of processes at a key input for storage or correction of areas.

Fig. 10-4 to 10-3 are flow charts of respective Steue conclusions of the copying machine according to an embodiment.

Fig. 10-4 is a diagram illustrating an example of selecting an area and copying that area on a variable scale.

Fig. 11 is a schematic sectional view of the copying machine according to another embodiment.

Fig. 12 is a sectional view showing a state in which a document is placed on a document platen.

Fig. 13 is a schematic plan view of the template pressure plate.

Fig. 14 is a schematic sectional view showing a state in which the original is placed on a platen.

Fig. 15 is a schematic plan view of the original placed on the platen.

Fig. 16 is a block diagram illustrating the control of a light emitting diode line when using a Digi talisiertastfelds.

Fig. 17 is a block diagram for explaining control operations on developing devices.

Fig. 18 shows a control panel for selecting Be ranges by key input.

Fig. 19 shows another example of an operation panel.

Fig. 1 is a sectional view showing the configuration of an embodiment of a double-sided copier to which an automatic feeder 9 and a sorter 39 are attached. Furthermore, the Fig. 1 shows a pressure plate 90 which can be put in the place of the document feeder. 9 A drum 1 according to FIG. 1 carries on its surface a seamless photosensitive material with amorphous silicon and is axially rotatable. If current is supplied by switching on a main switch 2 , a fixing device 3 is heated. When the fixing device 3 reaches a predetermined temperature, the drum 1 , conveyor belts A, B and C and a fixing roller 5 are rotated by means of a main motor 4 . When the fixing device 3 assumes the predetermined temperature at which it can be fixed, a subsequent voltage control process (preparation process) is carried out and it is determined whether or not there is toner in the developing devices 6 and 7 . Then the main motor 4 is stopped, after which the machine is in standby and waiting for the input of a copy start signal.

First, the types of copying that can be carried out by means of the copying machine according to the invention are briefly described, after which the copying processes are then described in succession. The types of copying include single-sided copying, in which after an image is formed on one side of a transfer paper, the paper will be discharged, two-sided copying, in which the paper is discharged after images have been formed on both sides of the paper, and multiple copying, in which the paper is discharged after multiple images have been assembled on one side of the paper. An intermediate compartment 8 is used for two-sided copying and multiple copying. By means of the plurality of development devices 6 and 7 can be copied onto the paper in several colors. Furthermore, the automatic selection of a changeable copy scale, namely the scale selection and the automatic selection of the paper format, namely the automatic paper format selection are provided in accordance with a determined template format. Furthermore, a zoom function and the like are also provided in the device.

Two-sided copying

First, the copying process for obtaining a two-sided copy from a two-sided original will be described. After the document feeder 9 is a template 10 has been mounted, a button on a control panel described below is 11 duplex copying of two-sided original eingege ben by pressing. Thereafter, a copy number is set and the black developing device 6 is selected, after which a copy start key is operated. The template 10 placed on the template feeder 9 is conveyed onto a template glass plate 12 . In the main part of the copying machine, an illumination lamp 14 assembled with a first scanning mirror 13 to form a unit is placed in a reference position or starting position on a sensor 92 , after which a voltage control (explained below) and a control or regulation of the light are carried out a charge coupling or CCD image sensor for capturing or measuring the template (explained in detail below).

The original 10 is illuminated by means of the illuminating lamp 14 and the light reflected by the original is scanned by means of the first scanning mirror 13 and a second scanning mirror 15 . The first and second scanning mirrors 13 and 15 are moved at a speed ratio of 1: 1/2, whereby the lengths of optical paths in front of a projection lens 16 and a document measuring lens 17 are kept constant during the scanning of the original. In this way, the reflected image light is projected through the lens 17 onto a measuring element or a charge coupling image sensor 18 and also onto the drum 1 via the projection objective 16 , a third mirror 19 and a fourth mirror 20 .

On the other hand, after being discharged by means of a pre-exposure lamp 21 , the drum 1 is subjected to a corona charge with a primary charger 22 (for example with positive charges). The exposure is then carried out through a slit in accordance with the image illuminated by the illumination lamp 14 in order to generate an electrostatic or charge image. During a scan to determine the original format, the charge image is erased by means of an erase lamp 23 , while at the same time a suitable bias voltage for suppressing an AC voltage component is applied to the developing device, thereby preventing the onset of toner with a DC voltage component. As the original information for measuring the original format, the image sensor 18 is supplied with the light reflected from a glass plate 91 in front of the original. However, the intensity of the light reflected from an area where there is no original is set very low. The measurement process with the image sensor is explained below. After completion of the measurement process with the image sensor, the scanning for copying is carried out, the charge image being generated in the manner described above. The charge image is then developed with the selected development device 6 or 7 into a visible image. By means of a paper feed roller 50 , 51 or 52 , a transfer or copy paper is fed from a selected paper feed opening of a hand loading device 24 , an upper cassette 25 , a lower cassette 26 or a stacking compartment 27 and conveyed to a location in front of a registration roller 28 . After a sensor 30 for determining the head part of the original or the image front edge a sensor element 29 attached to the unit comprising the illuminating lamp 14 and the first scanning mirror 13 has been detected, the registering roller 28 is driven after a predetermined time T 1 has elapsed, whereby the paper of the photosensitive drum 1 is fed under precise timing so that the front edge of the charge image is in register with the front edge of the paper. Thereafter, the paper passes through the gap between the drum 1 and a transfer charger 31 , so that the toner image is transferred from the drum 1 to the paper. After this transfer, the paper is detached from the drum 1 by means of a separator 32 . Thereafter, the surface of the drum 1 is nigt gerei means of a cleaning device 33, while at the same time be balanced by means of the pre-exposure lamp 21 voltage or potential changes, whereby the drum is ready for reuse again.

Furthermore, the paper is fed and fixed after detaching from the drum 1 by means of the conveyor belt A of the fixing device 3 , after which the paper web is changed over by means of a flap or switch 34 so that the paper is conveyed to a two-sided copy unit 35 . The paper then runs over the conveyor belts B and C, after which it is turned over and placed on the intermediate compartment 8 . After the completion of the exposure processes for the set number of copies, the template 10 'resting on the glass plate 12 ' is conveyed via paths D, E and F of the automatic document feeder 9 and again placed on the glass plate 12 in such a way that now the back of the template 10 is copied. After placing the original 10 , the paper fed from the intermediate compartment 8 by means of a paper feed roller 37 passes through a conveying path G, whereby it is conveyed to the position in front of the registration roller 28 . After the attached to the movable optical system Füh lerglied 29 has been detected by the sensor 30 , the regi strierwalze 28 is driven after the lapse of the predetermined time T₁. As a result, the paper is fed to the drum 1 under precise timing so that the front edge of the charge image coincides with the front edge of the paper. Thereafter, the paper again passes through the gap between the drum 1 and the transfer charger 31 , so that the toner image is transferred from the drum 1 to the paper. After the transfer, the paper is released from the drum 1 by means of the separator loader 32 . The surface of the drum 1 is cleaned by means of the cleaning device 33 , while at the same time potential changes are compensated for by means of the pre-exposure lamp 21 , so that the drum or the devices can be used again.

The paper released from the drum 1 is fed to the fixing device 3 by means of the conveyor belt A and fi xed. Subsequently, the paper is fed to a paper discharge roller 38 by means of the switch 34 and is ejected from there to the sorter 39 . After repeating the above-described operations in a number equal to the set number of copies, copying is completed. The resting on the glass plate 12 template 10 'is ejected via the conveyor path D on a template 40 .

It can also be copied from a one-sided or one-sided template. In this case, the original 10 placed on the document feeder 9 passes through a conveyance path H, being placed on the glass plate 12 , and then the exposure is repeatedly carried out in a number equal to the set number of copies. The paper with the transferred image is collected on the intermediate tray 8 in the manner described above. After the completion of the exposure processes in the set number of copies, the overlaying original 10 'is ejected via the conveying path D onto the original compartment 40 . At the same time as the template is ejected, a next template is fed in and placed on the glass plate 12 . This next template is copied to the other side of the paper, on the one side of which has already been copied and which is stored on the intermediate compartment 8 . Then the paper is ejected toward the sorter 39 . After the exposure processes in the set number of copies have ended, the original is ejected onto the original tray 40 via the conveying path D. These processes are repeated until all templates have been run through once.

Multiple copying

The basic sequence of multiple copying and the movement of the image-receiving material or paper will now be explained. After a document has been placed on the document feeder 9 , the multiple copying is selected by means of a key on the control panel 11 described below and the number of copies is set. The development device to be used is selected from the plurality of development devices. Then a copy start key is operated. Then, the original 10 placed on the original feeding device 9 is conveyed to the exposure position on the original platen glass plate 12 . In the same manner as in two-sided copying, a toner image is formed on the photosensitive drum 1 and transferred to the paper. The paper released from the drum 1 is fed and fixed by the conveyor belt A to the fixing device 3 . Subsequently, the switch 34 changes the conveying path so that the paper is conveyed to a unit 36 for multiple copying. As a result, the paper runs over the conveyor belt B and is then placed on the intermediate compartment 8 by means of a switching device 41 . After repeating the above-described operations in a number equal to the set number of copies, a first copying operation is completed. After the template 10 'resting on the glass plate 12 ' has been ejected via the conveying path H of the automatic conveying device onto the template, in the manner described above, a next template is fed from the template feeding device 9 and placed on the glass plate 12 . Thereafter the signal supplied from the intermediate tray 8 forth by means of the paper feed roller 37 of paper is conveyed via the conveying path G to the position before the registration roller 28 to the same side of the paper to be copied ren. The second copy is carried out in a similar manner as copying to the Copy back surface on the two-sided. The paper released from the drum 1 is fed to the fixing device 3 via the conveyor belt A and fixed. The paper is then fed through the switch 34 to the paper discharge roller 38 and ejected to the sorter 39 . By repeating the operations described above in a number equal to the set number of copies, the copying operation is completed.

Furthermore, the original is conveyed from the glass plate 12 via the conveyor track H onto the original compartment 40 .

An ongoing or continued double copy will now be described. After a template has been placed on the template feed device 9 , a button for inputting the double copy is actuated on the control panel 11 described below, after which the number of copies is set. In the exemplary embodiment, it is provided to select the developing device to be used from the developing devices and, furthermore, to automatically determine a color for a first page and a color for a second page for the double copying. The following explains the operations under the following conditions: A3 original size, direct copying, namely 1: 1 scale copying, automatic paper size selection (APS), predetermined first and second page developing devices (such as black) -Development device for the first side and the red development device for the second side). The copy format for the first page is set to A4 (half of the A3 format). The document transported to the exposure point by means of the document feeder 9 is scanned in the manner described above by means of the first scanning mirror 13 and the illuminating lamp 14 , whereby the charge image is generated in the manner described. The charge image is then developed into a visible image using the preselected black developing device. The paper feed from the upper or the lower cassette or from the stacking compartment is selected in which or in which the paper in A4 format is inserted, which is determined by paper format sensors 42 , 43 and 44 which are attached to these cassettes and respectively the stacking compartment are attached. If, for example, in the upper cassette 25 , the lower cassette 26 and the stacking compartment 27 each paper in the format A3, A4 or B4 is inserted, the paper is fed from the lower cassette 26 by means of the paper feed roller in question, which ent the paper in A4 format holds. The paper is then conveyed to the position in front of the registration roller 28 . After the sensor element 29 attached to the movable optical system or the scanning unit has been detected by means of the image front edge sensor 30 , the registration roller 28 is driven after the lapse of the predetermined time T 1. Thus, the paper is conveyed to the photosensitive drum 1 under precise timing so that the front edge of the charge image coincides with the front edge of the paper. Thereafter, it is transferred to the paper in the manner described above, and the image is fixed to the paper, after which the paper is ejected, whereby the copying process is completed. Then the second page is copied. The device is designed such that, after the exposure scanning for the first side has ended, the movable optical system is automatically returned to the reference position (starting position) on the sensor 92 . The copying for the second page starts from the reference position or starting position on the sensor 92 ; after the Fühlerele element 29 attached to the movable optical system or the scanning unit 45 has been detected by the sensor 30 for detecting the edge of the image, the erase lamp is switched on for a predetermined period of time T 2, which corresponds to the width of the paper in A4 format. This erases the charge image for the first side and the potentials on unused areas, so that only the charge image for the second side remains. The charge image for the second side is developed into a visible image by means of the preselected red developing device (color developing device). By means of the paper feed roller 51 , the paper is fed from the lower cassette 26 , in which the paper in A4 format is contained. This fed paper is conveyed to the location before the registration roller 28 . Thereafter, the registration roller 28 is driven after the lapse of a predetermined time T₃, whereby the paper is guided to the drum 1 under precise timing such that the front edge of the charge image for the second side coincides with the front edge of the paper. Thereafter, the image is transferred to the paper and fixed in the manner described above, completing the copying process. In addition to this, the following combinations can be selected on the control panel described below: two-sided copying and several developing devices; Two-sided copying and double copying; Multiple copying and multiple developing devices; Multiple copying and double copying, etc. There is another function for changing the reproduction speed, namely, the peripheral speed of the drum 1 . That is, the speed of reproduction is changed when the amount of light of the illuminating light on the photosensitive drum 1 is small. If the write or copy function is selected on the control panel 11 , the reproduction speed is automatically set to a low speed.

The device also has the following function: the extinguishing lamp is formed from a number of light elements arranged at small intervals, which can be switched on after the imagewise exposure before development such that any points on the charge pattern on the drum 1 can be deleted. Any charge image can be deleted by switching on any light element of the extinguishing lamp. Images generated in this way can be put together by multiple copying in the colors of several development devices.

The above-mentioned change in Reproduktionsge speed is achieved in the embodiment that a DC motor is used as the drive source or main motor 4 and its speed is variable according to FIG. 2 controlled under phase coupling control GE. That is, a signal from an oscillator 80 is used as a reference signal. From a connected to the DC motor 4 resolver 82 , a speed signal is fed back to a phase coupling or PLL control circuit 81 . The output signal of the control circuit 81 is amplified with an amplifier 83 and output to a driver stage 84 . From the driver stage 84 of the DC motor 4 is driven so that the reference signal from the oscillator 80 is synchronized with the control circuit 81 signal returned. By input signals A 'and B', the frequency of the output signal of the oscillator 80 is changed, whereby the speed is changed. The signals A 'and B' are given by a (not shown) speed command circuit ben.

Operating system

Fig. 3-1 is a perspective view of the copying machine according to another embodiment. With 251 a template glass plate is designated, on the surface of a touch pad (digitizing pad) is attached with transparent electrodes.

The coordinates of a selected location or a selected point can be determined in that a pressure pen 252 is placed on the glass plate 251 and pressed. The description of the functional principle of the touch panel is omitted here. It can be seen that the exposure image formed on the photosensitive material is not affected at all by exposure with the original for image formation because the transparent electrodes are used. A switch 253 is attached to the handle 252 . The coordinates are only entered when the switch 253 is actuated. At the edges of the glass plate 251 in the X-direction and the Y-direction light-emitting diode rows 254 are attached, the light-emitting diodes of which can be selectively switched on and off according to commands from a central processing unit (CPU) of the device. A control panel 255 is used to enter control commands into the copier. The control panel can be attached separately.

The Fig. 4 is a plan view of the control panel. The functions of each key are described in sequence below.

Function keys 100 a to 100 e each for SpeI manuals and retrieve copy modes, which can be ge in any desired manner by means of respective keys of the control panel selects. Up to five types of copies can be saved. That is, the types of copies normally used by the user can be saved. For example, special scales used by respective users, certain areas or the like can be saved by a range selection explained below or the like. By simply pressing one of these function keys, a desired type of copy is set immediately. In the copying machine, the respective contents of memories are constantly maintained by means of a data backup power supply.

101 to 110 designate a numeric keypad on which a number of copies is normally set and which, in conjunction with an asterisk key 114, is used to enter various types of data in different asterisk operating modes.

A delete key 111 is used to delete a set number of copies or data. With a reset button 112 , a set operating mode is canceled and a predetermined normal operating mode is set again. The Fig. 4 also shows a Vorheizungstaste 113 Sternsym bol button 114 button for switching to different rating symbol modes, a stop key 115, and a color 116, with any developing devices of a plurality of built-in device Entwicklungsvorrichtun gene selectable are. If a color developing device is selected, a built-in light-emitting diode 150 is also switched on as a warning.

With 117 a copy start key is designated, which is provided with a light-emitting diode 151 . This LED lights up green when copying is possible (except while a copying process is in progress), otherwise it lights up red. With an automatic exposure button 119 , an automatic exposure is selected, in which the original density is measured and the development voltage is corrected accordingly so that a copy is obtained in a suitable density. When the automatic exposure control is selected, a display device 152 lights up. A desired density can be achieved by increasing or decreasing the density value using buttons 118 and 120 for manual adjustment of the density. Pressing the key 118 increases the density, namely a high density. In contrast, pressing the key 120 decreases the density, namely a weak copy. A density value displayed on a display device 153 changes in accordance with the pressing of the keys 118 and 120 . The display devices 152 and 153 serve to display the named density setting conditions. The number of copies is displayed on a 7-segment display device 154 .

A cassette selection key 121 is used to select an arbitrary cassette for the copy paper by hand. This copier is designed to automatically select the paper size or paper. On a display device 155 , the cassette is displayed, which is selected by means of the cassette selection key 121 or automatically.

122 denotes a selection key for selecting a fixed magnification scale, 123 denotes a selection key for selecting a fixed reduction scale, and 124 denotes a key for the automatic scale selection. The automatic scale key 124 causes the correct scale to be set automatically in accordance with the detected original format and a selected paper format or cassette format. The original format is captured by the image sensor 18 . When the automatic scale selection is turned on, a display device 158 lights up. Zoom buttons 125 make it possible to set the scale in percent units using the "+" button or the "-" button. With a direct copy or real format key 126 , the copy scale is set to the scale 1: 1 (100%). A display device 157 lights up during direct copying. 156 with a fluorescent display tube serving as a message display is designated in a dot matrix configuration. The display tube 156 normally shows the set copy scale, the selected cassette or paper format, the type of copy and the like, as well as messages which indicate complicated operations or the like, the occurrence of a malfunction in the device or incorrect operation.

With 127 is a "one-sided → two-sided" copy select button, which is used to automatically copy two one-page originals our use of the intermediate compartment in the device on the two sides of a single sheet of paper. A "two-sided → one-sided" copy select key 128 is used to copy a two-sided original onto one side of two sheets of paper each using an automatic feeder / feeder (RDF). A "two-sided → two-sided" copy select button 129 is for copying a two-sided original onto the two sides of a single sheet of paper using the intermediate tray and the automatic RDF original feeder. A multi-copy select key 130 is for multi-copy for overlaying two or more images on a single sheet of paper using the intermediate tray.

Pressing one of the keys 127 to 130 turns on a display device 159 to 162 corresponding to the keys.

A double copy select key 131 is used to select the mode in which a document placed on the platen is divided into right and left parts, and these two parts are illuminated and scanned in a single operation so that two copies are obtained (each referred to as A copy and B copy).

A double copy / multiple copy select key 132 has the function of superimposing the two copies A and B obtained in the above-described double copy mode on the same paper.

A double copy / two-sided copy selection key 133 functions to copy the A copy and the B copy using the intermediate tray on the front and back of the same paper, respectively.

A frame delete key 134 is used to delete shading or darkening that would occur on the edges of a book template or when double copying in the middle of double-sided pages.

A slide button 135 is used to shift an image right or left. The amount of shift can be adjusted by pressing the number keys while holding down the slide key 135 . The amount of displacement can also be saved using the function keys 100- a to 100- e. On the other hand, when multiple copying is set, in which copying is carried out in two different colors, the registration timing is controlled so that the shift distances coincide with each other in the first and second copies. This was also the case when copying in one color.

An area selection key 136 is used to determine areas and also to unset areas. To determine the area, it is possible to select one of two operating modes, namely an operating mode in which the template has priority (the size of the area to be defined can also be changed in accordance with the variable scale) or an operating mode in which the cassette or the paper format has priority (whereby the size of the area to be defined is constant regardless of the changeable scale). An X / Y key 137 serves here as a data input key for entering coordinates for the area by means of the numeric keypad.

An "inside / outside" button 138 is used to select whether the image should be developed inside or outside the specified area.

A correction key 139 serves as a data recall key for retrieving and correcting set area data.

An automatic switch button 140 is used for automatic switching between the interior and exterior during multiple copying and color development. If the automatic switching key 140 is pressed during the multiple copying, the switching between the inside area and the outside area and between the colors takes place automatically between the first or A copy and the second or B copy.

In the double copying, an automatic color change key 141 is used, which has a function that automatically switches between the development colors for the A copy and the B copy. When the button 141 is pressed, a display device 170 lights up.

Each of the light emitting diodes labeled 157 to 171 represents an operating mode display device which displays a selected operating mode. With display devices 172 to 174 , the number of a set area is displayed. In the copier according to the exemplary embodiment, up to three areas can be selected or set. Display devices 175 and 176 each display the development of the image inside and outside the area selected by the "inside / outside" selection button 138 . A group of light emitting diodes denoted by 177 represents a display device which indicates which of the values Xmin, Xmax, Ymin and Ymax is set for the area.

A key for a range selection by means of the image sensor is designated by 142 . When the key 142 is pressed, a scan is performed with the optical system and a selected area is only recognized by reading markings attached to the original.

A sorting key 143 and a collator or mixing key 144 are also provided. The sort mode and the mix mode are displayed on displays 178 and 179 , respectively.

Fig. 5 is a block diagram showing the basic structure of the display part.

A central processing unit 201 is a microcomputer for controlling the respective display devices and the display elements. The display content is based on data from the central unit of the main unit.

Forty characters of 5 × 7 dots each can be displayed on a fluorescent display tube 206 . Data of five 7-bit bytes is required to represent a character. The 35-bit data are read out serially from a character generator 203 upon a command from the central unit 201 and transferred to a shift register / buffer / driver stage 204 . In this driver stage 204 , 5 byte data, namely 35 bits, are buffered. Then, to set the time of displaying a character, a driver signal 205 outputs a job signal so that a single character is displayed. In this way, characters are displayed dynamically one after the other by the lighting up of the fluorescent display tube. The switch-on or duty cycle is 1/40 or correspondingly less due to blanking periods.

With 208 a light-emitting diode matrix is designated in the display part. This LED matrix is operated by the dynamic switching on of the respective LEDs.

Fig. 6 is a block diagram of peripheral construction parts on an input part of a central processing unit 301 for the control of the main unit. A key matrix 302 represents a group of switches which are attached to respective input keys and which are dynamically queried by the central unit 301 in a known manner, it being determined which key is pressed.

With 304 a digitizer or a digitizing key field is designated. By means of a control circuit 305 , the coordinates X and Y of a location are detected, which is characterized by the application of a light pen or the like. A switch 306 for inputting a trigger signal for coordinate input is attached to the light pen. Central unit 301 reads in the coordinates of the point or location at which the stylus is attached in synchronism with the trigger edge of the trigger signal for the coordinate input.

Fig. 7 is a block diagram of a driver circuit for the lines arranged to display the selected areas on the edge of the platen glass plate. LED rows are lined up along the edge of the glass plate in the Y direction and the X direction, the LEDs of which are dynamically switched on and off via driver stages 307 and 308 .

Fig. 8 illustrates a state in which the light emitting diodes of the LED rows 309 and 310 are turned on. Assuming that the copying of the area shown in dashed lines in FIG. 8 has been selected, the X and Y coordinates of the area selected for the image generation are switched on, which is shown in FIG. 8 by the dashed lines of the light-emitting diodes is. In contrast, if copying outside the range is selected, the light-emitting diodes shown in broken lines remain switched off, while the other light-emitting diodes are switched on. On the other hand, the light-emitting diodes can also be switched on in an opposite manner for a sub-area lying in the selected area, from which no image is generated.

Fig. 9-1 shows color detector circuits for the development devices. Color detection switches 313 and 314 are closed by projections 311-1 and 312-1 attached to developing devices 311 and 312 , respectively. The central unit 301 determines the color of the development device used from the on and off switching states of the color detector switches 313 and 314 . That is, each development device is assigned a certain switching pattern for a respective color. For example, if three color detector switches are used as shown in Fig. 9-1, seven, namely (2³-1) colors can be distinguished.

The setting of areas will now be explained. . ": Normal Template 2: area selection 1... Normal cassette" when pressing the Bereichwähltaste 136 of Figure 4, on the message display tube 156 display. The message corresponding to the currently selected memory content is shown flashing. The operating mode can also be changed by pressing the "1" or "2" key on the numeric keypad. When only the range selection key 136 is pressed, a sequence of these display operations is brought about.

The case will now be explained that the range selection in with respect to the template. With this loading Drive mode are used to select the range from the in with reference to the coordinate origin specified the values for the X-axis (in the sub-scanning direction, nam Lich in the direction of scanning with the optical System) and the Y axis (in the main scanning direction, namely in the direction of the scan on the image sensor) entered. When copying with a changed scale the selected area is also automatically enlarged or reduced.

Using the numeric keypad 101 to 110 of the X / Y selection key 137 , coordinate points Xmin, Xmax, Ymin and Ymax are successively determined, whereby the determination of an area is completed. That is, the respective data are entered in the order X / Y, Xmin, X / Y, Xmax, X / Y, Ymin, X / Y, Ymax, X / Y of the key operations. The respective coordinates are entered in millimeter units.

If the X / Y key 137 is pressed after the numerical values have been entered, the LEDs of the display group 177 are switched on in succession. In this way, the operator can determine that the coordinate has been entered for each point. In this case, the respective coordinate is entered according to the interactive or dialog method by means of a message on the display tube 156 , such as by means of the message "area 1: coordinate Xmin... ○○○ mm". Therefore, the operator can easily set the necessary data even when he operates the device for the first time.

After an area has been selected by this input of the four points, the indicator 172 lights up to report that an area has been selected. Furthermore, copying within the range is automatically selected and the display device 175 is switched on. With the inside / outside button 138 you can switch to copying outside the area.

On the other hand, an area can also be determined with the touch pad using a group of switches of the transparent electrodes on the platen glass plate 251 .

In this case, the original is placed on the glass plate so that the image side is facing upwards. In this case, however, there is a reference point at the left front corner of the glass plate and thus differs from the reference point at the left rear corner that is actually used for copying. In this state, by placing or pressing the stylus 252 on the template, two points on a diagonal of a desired area are determined (the area being limited to a rectangle). Then, with the stylus 252 attached, the input switch 253 is actuated. The coordinates of the point touched by the stylus 252 are input by means of a signal generated when the input switch 253 is pressed or released. Coordinates are not entered when points are selected by applying the stylus while continuously pressing the input switch 253 .

When selecting the coordinates with the stylus, simply pressing a single point determines the two coordinates X and Y simultaneously. Therefore, two of the light emitting diodes 177 are switched on at the same time. Furthermore, since the entered coordinates are displayed as numerical values on the message display tube 156 simultaneously with the input, they can be confirmed under visual observation. According to the above description, the area can be set by determining only two points on a diagonal with such an input via the transparent digitizing touch panel.

There is now the range selection by means of a charge dock tion device or the image sensor described.

First, an original on which an area is to be selected is placed on the platen and copied using a color developing device (other than black). With a marker pen or the like, the desired area on the copy is marked by a strongly drawn frame. The original copy is developed in color because it is necessary to obtain a difference in density between this color and the color of the marker pen. The aim should be to develop in a somewhat thin color so that the desired area can be distinguished. Furthermore, the template can also be covered with a transparent sheet, thin paper or the like and the desired area marked on this sheet or paper. Next, the copy, the see-through sheet, the thin paper or the like is put back on the platen and the image sensor loading range key 142 is pressed. Thereupon begins scanning with the optical system, in which the marked area is recognized by means of the image sensor 18 arranged in the optical path. It is now assumed that only a partial area can be recognized in the area determination with a single scan. In this case, the recognized area can be determined and the coordinates are displayed on the message display tube.

In this way, the range can be selected using three types of input methods, namely by means of the numeric keypad, by means of the stylus or by means of the image sensor. Using any combination of these methods, up to three areas can be selected and also saved using the function keys 100- a to 100- e. Furthermore, the entered area data can be checked on the message display tube 156 and can also be observed on the LED rows 254 arranged along the X-axis and the Y-axis next to the original platen glass plate 251 .

After the definition, the areas can be selected using the correction key 139 . That is, by pressing the correction key 139 once, the first area is selected. The second area is selected by pressing the correction key 139 again. The third area is selected by pressing the correction button 139 again. The correction mode is switched off by pressing the correction button 139 a second time, while the first area is then selected again by pressing the correction button 139 again. Furthermore, by selecting the X and Y coordinates using the X / Y key 137, these coordinates can be called up successively for the message display. Under these conditions, the set area can also be corrected by changing the stored area data using the number keys. It is evident that the numerical values entered by means of the transparent digitizing touch panel or touch touch panel, by means of the image sensor or the like can be corrected with the numeric keypad.

Furthermore, by selecting an area with the correction button 139 and pressing the delete button 111, a certain area alone can be deleted.

Having the area as described above as well as copying inside or outside the area have been selected, the copy will be deleted device that matches the image inside or outside the Area corresponding charge image deleted so that the desired copy is generated.

On the other hand, the area can also be selected the fact that the device is designed so that the operator the switching on and off of the LEDs of the LED lines can be ordered and the light diodes are switched on in a certain zone.

After the area coordinates have been determined by the central unit 301, the light emitting diodes of the erase or blank area formed as the light emitting diode line are determined by the central unit at the times corresponding to the coordinates Xmin to Xmax for the undersampling direction (X direction) of the image formed on the drum The lamp for copying outside the area is switched on and switched off for copying within the area. From the central processing unit 301 , the LEDs corresponding to the coordinates Ymin to Ymax for the main scanning direction (Y direction) of the image on the drum are switched on for the copying out of range and for copying within of the area switched off. This will result in a copy of the interior or exterior.

Now the key input when selecting the area will be wrote.

Fig. 9-2 shows a read / write memory (RAM) or memory for the range selection, the wertnied membered three bits identifiers are indicative of the storage areas 1 to 3. If an area is set by means of the ten key, the touch pad or the like, the identifier for the number of this area is set.

Fig. 9-3 shows schematically the content of memory locations during an area correction. If a new area is selected, the identifier for the number of the new area is set, while at the same time the data of the four points (Xmin, Xmax, Ymin, Ymax) are saved for the respective area. Since up to three areas can be selected, a corresponding number of storage locations are provided in the main memory.

When an area is corrected or deleted, the area is selected by means of the correction button 139 , whereby the data for the selected area are entered in a correction storage location in the working memory. Furthermore, the points are selected by means of the X / Y key 137 and the corresponding data are corrected by means of the numeric keypad and the delete key, after which the data are again stored in the assigned memory location in the working memory and the correction is thus completed. The area correction program executed for a respective key input is described below with the aid of flow diagrams.

Fig. 9-4 is a flow chart for the input by means of the correction key 139th

If it is determined in step 1 that the correction button is pressed, the area number for the correction upgraded to area 1, 2 or 3 chooses (step 2). If, however, under the selected Area number no area is saved yet skipped this number (so that the correction Reichsnummer always remains "0" if none of the areas is saved). After area 3, the Area No. 1 selected.

In step 3, they are already in the memory le for the correction transferred data into the assigned nete memory location and the data for the Area with the newly dialed number in the memory digit entered for the correction (step 4).

Then a point number is set to "0" (step 5).

Fig. 9-5 is a flowchart for the entry with the X / Y button 137th

If the X / Y key 137 is operated (step 6), it is checked in step 7 whether a new area is being selected or not. When a new area is selected, various processes are carried out, but are omitted in the description (step 10).

In step 8, the correction area number is checked. When the correction area number is "0", namely, no correction is made, the operation of the X / Y key 137 is disregarded. If the correction range number is entered, the point number is selected in step 9 as follows:

Point No. 0 (origin) → Point No. 1 (Xmin) →
Point No. 2 (Xmax) → Point No. 3 (Y-min) →
Point No. 4 (Y-max) → Point No. 0.

Fig. 9-6 is a flowchart for an input with the delete key 111.

If it is determined in step 11 that the delete button 111 has been operated, a check is made in step 12 as to whether or not the currently selected area should be corrected. If no correction and no determination or selection is made, the set number of copies is deleted (step 16). If the area is to be corrected, a check is made in step 13 as to whether the point number has been dialed or not (namely, the point number is "0" or not). If the point number is "0", the area storage is canceled at a step 14 (namely, the memory identification in the area selection memory is reset). If the point number is selected, namely differs from "0", the memory data for the selected point are deleted in a step 15, ie set to "00". If, for example, the point number "1" is selected, "0" is used instead of "EDIT Xmin" in the correction memory location of the main memory.

Fig. 9-7 is a flow diagram for an input with the numeric keypad 101 to 110.

If at step 17 an entry with the tens keyboard is determined, follow steps 18 and 19. If at steps 18 and 19 it is determined that a Area to correct or choose will be at a step 20 the entered with the number keys Data as data for the selected point number in the Correction memory location of the main memory entered.

In contrast, if no area is corrected or a is set, are entered with the numeric keypad data as numerical data for setting the Number of copies or the like entered (step 21).

Fig. 3-2 is a representation of the plate template overlay. A command section 320 is formed on the front side of the digitizing touchpad 304 formed with the transparent electrodes. A command is entered in the same way as when entering the coordinates for the area selection by pressing or applying the stylus. In this case, the coordinates of the point touched by the stylus are read. If the read coordinates are those of a point in the original platen, an area or a copy scale is determined. If the coordinates are those of a point in the area of the command section, the command corresponding to the coordinates is selected. Fig. 3-2 shows a command area 321 for copying the image within the selected area in black, a command area 322 for copying the image within the selected area in color (such as in red), a command area 323 for copying the image outside the selected area in black, a command area 324 for copying the image outside the selected area in color, a command area 325 for deleting the coordinates entered by means of the stylus, a command area 326 for copying the black image within the selected area and the color image outside the selected area and a command area 327 for copying the color image within the selected area and the black image outside the selected area. In this way, the area and the color can be determined using the touch pad.

It can be seen that the touch pad is not on the front layered glass plate must be formed, but on the front of the document cover or separately may be attached from the main part of the copier.

Various functional principles can be used for the touch panel pien be considered, such as identifying a Place a resistance value, one electrostatic capacity or a deformation factor or by means of light.

The copying machine according to this embodiment has the original size detection device with the image sensor 18 and has the cassette or paper format input device and the projection lens 16 , which is designed as a zoom lens for continuously changing the copying scale, whereby the copying scale or the paper format can be selected automatically .

When the copy start key 117 is pressed, a prescan starts with the optical system. The image of the original is projected onto the image sensor in order to detect the original format. For this purpose, the pressure plate 90 forms out as a mirror surface, so that there is a density difference between the original and the mirror surface, whereby the template format can be determined from the locations of changes in density. The eraser prevents the toner from settling on the charge image corresponding to the mirror surface area and producing a visible image. There are some originals in which, due to their high densities, it is determined that there is no original. Therefore, if it is determined that there is no original on-hook, the voltage on the lighting lamp, the reference level for discrimination and the like are changed, after which prescan is again performed, whereby the original size is detected.

If the position of the determined template deviates from the reference point by a distance that is greater than a predetermined value, this fact is reported as an incorrect template position by means of the message display tube 156 . After that, the execution of the copying process is blocked. Similarly, an alarm is displayed and the copy is subsequently blocked when it is determined by means of the image sensor 18 that the original is placed at an angle. In this case, the inclination of the template is determined from the coordinates of the corners of the template or from the gradient or the inclination of the template edge.

However, sometimes the operator makes a forward deliberately laid on at an angle. In this case the copying process can be carried out when using a Alarm switch (not shown) the alarm is canceled becomes. Thereby to determine the template format and  for automatic selection of the copy scale or The coordinates of that point moved the farthest from the reference point lies. The extinguishing device is required for this as delete the part determined outside the template.

Further, if the original is placed so that it is offset with respect to the X-axis (in the direction of scanning with the optical system), the image is automatically shifted with the scanning timing and the paper feed timing (registration roller operating timing 28 ) can be set accordingly so that a usable image can also be generated.

On the other hand, when generating an alarm signal or an alarm display by pressing the Copy start button ignoring the warning ko be pierced.

If for that in the manner described above he document size is either a cassette or paper format or a copy scale, the each other value is automatically calculated and set (automatic scale selection or automatic Paper size selection).

The one calculated from the template format and scale Paper size is not always a standard size. Therefore the smallest in this calculation as the first condition Format for the calculated paper format Cassette used. To prevent as a result little mistake or determination error the template Genformat erroneously than format one step larger the data for the original format is recorded as Data processed for a format that is minor  is smaller than the actual format (i.e., a Tolerance allowed). In practice, a A few millimeters in the X direction and in the Y- Approved direction.

On the other hand, a suitable copy scale from the Original size and the cassette or paper size averages. In general, however, it is common for one Standard format on a changed copy scale to copy another standard format (the copying in 1: 1 scale, namely copying from a standard format to the same standard format). If hence the determined template format with the standard format matches or is almost the same, can also preferably instead of the precisely calculated scale one of these special standards between these normfor maten can be chosen.

As a copy paper format, the manufacturer also certain standard format in some cases by the user or special formats are often used in a country. At the copier according to the invention can also be used for such Universal cassettes for the automatic selection of dimensions stave or paper size according to this special formats, the dimensions are saved in the X and Y directions become. In this case, the storage can be of the same type how to select a range in three ways become.

First, the device is in standby mode on a Star symbol operating mode switched. Thereby at the Message display tube in interactive mode the dimensions indicated and ordered as follows:

"Universal 1: X (vertical): --- mm
Y (horizontal): --- mm ".

In the initial state where nothing is prescribed is a maximum paper size A3, LGR or the same set.

In this state, the dimensions in the X and Y directions are entered in 1 mm units using the number keys. Likewise, an original can be placed on the glass plate 251 and the paper format can be entered by means of the transparent electrodes, or the paper format can be detected and stored by scanning with the image sensor. The image sensor scan is effected by means of the area selection key 142 . This format acquisition and storage takes place only in the universal cassette storage operating mode from the star symbol operating modes (*).

As described above, the automatic Choice of paper size and copy scale also at non-standard template format, not the Standard paper format and any scales between the formats.

On the other hand, with a copier, in which the range selection function is provided, the automatic selection of copy scale or paper formats in that the paper format or the Scale along with the format of the selected area is used instead of the original format.

The scale setting procedure is described below ben.  

In this copier, the scale can be set using the transparent touch panel on the platen in addition to the fixed scale selection keys 122 and 123 , the zoom keys 125 for selecting any scale, the automatic scale selection key 124 and the like. In this case, the scale can be set by selecting a scale setting mode from the star symbol operating modes and specifying two points on the touch pad on the platen. That is, the scale is set according to the ratio between the distance from the point indicated by the first touch to the reference point for the original to the distance from the point indicated by the second touch to the reference point for the original. If the second touch determines a point that is wider than the point specified on the first touch, a scale for the image enlargement is achieved. In contrast, if a closer point is determined with the second touch, a scale for image reduction is achieved. This entry is also shown on the message display tube as follows:

"1st distance: 2nd distance = --- mm: --- mm → ---% ".

In the same way, the changeable scale can also by inserting two values using the ten keys be determined. It is also possible that be according to these two scale determination procedures calculated scale adjustable in the copier Scale range exceeds. To make it possible desired scale or enlargement by repeating copying twice can in this copier when the scale or  Magnification cannot be achieved by copying once is also a yardstick for a second copy be prescribed as follows:

"○○○% = 1.): ○○○%, 2.): ○○○%"

After the first copying, it will be under changed dimensions bar made copy placed on the platen and entered the displayed scale, then again is copied so that a copy at the desired scale is achieved.

Therefore, with this device, at the copying scale of 50 to 150% are adjustable, copy scales in the range from 25 to 225%.

The scale for the second copy can be done after finishing the first copy can be set automatically.

Furthermore, the copy scale can also be entered on the touchpad in connection with a template capture can be determined with the image sensor. That is, at the key the points are determined with the stylus correspond to a desired format to which the copier area should be enlarged or reduced. After that the template is placed and the template format in a pre-scan determined. The copy scale can now from the relationship between these two formats be true. The number of repetitions of the copy rens can be chosen as long as a ver deterioration in image quality is permitted.

Fig. 10-1 is a flowchart of the determination of the copy scale using the touch pad or the ten key pad. First, the first coordinates are entered with the stylus or the numeric keypad, which for example correspond to the template format (step 1). Next, second coordinates such as B. given the coordinates corresponding to a desired copy format (step 2). To enter the coordinates, a point on a diagonal is selected through the origin on the platen glass. When entering the coordinates using the number keys, it is sufficient to enter only the X coordinate or only the Y coordinate. The copy dimension rod CM is calculated from the ratio of the entered second coordinates to the entered first coordinates (step 3). It is then checked whether or not the calculated copy scale is within the range of a reduction or enlargement possible in the copier (step 4). If the scale is within the possible range, this copy scale is displayed (step 8). If the scale is outside the possible range, the root is drawn from the calculated copy scale CM to determine whether the scale can be achieved by copying twice or not (step 5). The root value is then used to check whether the copying scale CM is within the range that is possible by copying twice or not (step 6). If the scale is within the more possible range, the root value received is used as the scale and the scales for the first and second copying are displayed (step 9). If the scale is outside of the range that can be copied twice, this is indicated by a warning indicator on the message display tube (step 10).

If the standards for the first and the second copy ren are the same, namely the root of the are the desired scale, the scale for the second  Copy cannot be set.

The standards for the first and second copying must not necessarily achieved by root pulling. Rather, the first measure can be that of the first Copy achievable scale can be set. When the quotient of the division can then be used as a second measure the first calculated or desired copy scale as Dividend and the resulting first standard as a divi be used. There are therefore various types Combinations possible. Furthermore, it is obvious that by copying three or four times a far is achievable from a wider scale range, if not the image quality must be taken into account.

The control of the copying operations will now be described with reference to the flowcharts in Figs. 10-2 and 10-3 with respect to double copying, multiple copying, area selection, etc. At step 11, it is checked whether the copy start key is operated or not. If the copy start key is operated, the copy routine is executed (step 12). The copying routine is explained with reference to Fig. 10-3. First, the copy scale CM and the copy density are determined, and accordingly the lens, the development bias and the like are set (steps 30 and 31). A color selection is then determined, namely it is checked whether the color copying is selected or not (step 32). If color copying is not selected, the black developing device is selected (step 33). If color copying is selected, the color developing device is selected (step 34). It is then determined whether an area is selected for copying or not (step 35). If a range has been selected, it is determined whether or not the selection was made using the cassette or the paper format as a reference variable with a variable scale (step 36). If the paper size is not used as a reference, the template is the normal, so that the area itself is enlarged or reduced in accordance with the changed scale. Therefore, an area is set as the target area, which is obtained by multiplying the selected area by the copying scale CM determined in step 30 (step 37). As a result, for copying the image outside or within this area, it is sufficient to switch on the light-emitting diodes for fading out or deleting corresponding to the new area. It is then determined which operating mode was selected with the inside / outside button, namely whether the copying of the image was selected inside or outside the area (step 38). If the inner area is to be copied, an identifier is set which has the effect that the image outside the area is deleted by appropriate control of the blank exposure lamp (step 39). If the outside area is selected, another identifier is set which causes the image within the area to be deleted (step 40).

If no area is selected, the above is not applicable described control. It is then checked whether that continued or double copying is selected or not (Step 41). When double copying is selected, to determine the scan length determines whether the A copy is to be generated (namely the left half of the placed Template to be copied) (step 42). For the A copy an identifier for executing the A-scan is ge (where the left half of the original placed is scanned) (step 43). If not the A copy an identifier for executing the B- Sampling set (where the right half of the original is scanned) (step 44). If double copying  is not selected, will correspond to the original format scanned. The copying processes of exposure, Ent wrap, transfer, fixation, etc. are accordingly the conditions set out in the previous Decision steps were determined (step 45).

The copying routine proceeds as described above. Referring to FIG. 10-2 is then determined at step 12-1, whether the duplex copying is selected. If two-sided copying is selected, the sheet of paper is placed face up on the intermediate tray (step 12-2). If two-sided copying is not selected, a step 13 determines whether the multiple copying is selected or not. If multiple copying is not selected, the paper is ejected onto a paper discharge tray (step 14). If multiple copying is selected, the sheet of paper is placed face down on the intermediate tray (step 15). Then it is determined whether or not the automatic change of color and area is set in the device, namely whether the button 140 or 141 for the automatic change between copying the image inside and outside the area or the automatic change of color between the first and second copies have been pressed or not (step 16). If automatic switching is set, there is a color change and between copying inside and outside the area (step 17). It is then checked whether the continued or double copying is selected or not (step 18). If double copying is not selected, pressing the copy start key is waited for by hand (step 20). If continued double copying is selected, the copying routine is executed again (step 21).

Fig. 10-4 shows as an example a case in which a region is selected and the copy in a different degree rod is effected to the image outside the region. At (a) a template is shown in which the selected area is shown by a dashed line 350 . When copying on a different scale with the original as normal, the area is also enlarged or reduced as shown in (b), so that the image within the enlarged or reduced area is copied completely without image loss. If, however, copied on a normal scale with the cassette or the paper format as normal, the area at (c) is not enlarged or reduced and only the image is enlarged or reduced, so that the case can also occur that a Part of the picture is dropped.

The color change in two-sided copying in the double copying mode will now be described. Two originals (A4 or smaller) are placed on the platen. Then, the double copy / two-sided copy selection key 133 is pressed. Furthermore, the automatic color change key 141 is pressed. This sets an operating mode in which two-sided copying continues in different colors. At this time, when the copy start key 117 is pressed, only the original placed on the left side is scanned and copied onto the front of the recording paper. The paper is then placed on the intermediate compartment. Here, the switching or actuating device 41 is ge up, so that the recording paper is placed with the copy side up on the intermediate compartment. For the color change, the exposure device is automatically changed and then the next original is scanned. Here, the empty exposure lamp is switched on during the scanning of the first original, so that no charge image is generated for the first original. The recording paper placed on the intermediate tray is conveyed to the position in front of the registration roller and then conveyed to the drum at the time when the front edge of the charge image for the second original coincides with the front edge of the recording paper. If a binding margin is to be formed, the time is set forward or backward by a time corresponding to the binding margin. The image of the original on the right is copied onto the back of the recording paper, after which the printed paper is ejected from the machine. In this way, a two-sided copy is obtained, in which images of different colors are copied on the front and the back.

When the actuator 41 is set down, the recording paper is placed face down on the intermediate tray. In this way, a multiple copy is produced in which the image of the left template and the image of the right template are copied in different colors.

On the other hand, two-sided copying or Multiple copying an area can be selected and copied. The color change can also be made in another operating mode than the continued double copying. In the case of multiple copying and two-sided copying After the first scan, the Ent changed winding device and then the second Ab groping waited.  

FIG. 11 is a sectional view of the copying machine according to another embodiment. In Fig. 11, 501 denotes a photosensitive drum. After the drum 501 has been loaded uniformly with a charger 502 , a charge image is generated on the drum 501 in accordance with image light 503 from a template. A light emitting diode line 504 is normally used to remove the charges of an image-free area; the LED line is also used in this embodiment to delete any area of the template.

To select an arbitrary area of the original FIG an original is in accordance. 12 521 placed with the image side up on a Vorlagenandruckplatte 520th The position of the template can be determined in a precise manner by covering the placed template 521 with a job menu or job selection sheet 522 ( FIG. 13). The original is placed so that it abuts a reference point at the upper left corner of the original pressure plate 520 . The template is displayed or copied so that its left edge becomes a reference line.

A touch pad or digitizer is embedded in the master pressure plate 520 . By touching two points (X1, Y1) and (X2, Y2) on the diagonal of a selected area, an area can be defined in which these two points lie in the diagonal corners.

If, according to the template is applied 521 to the selected area on an original support glass 523 Fig. 14, the front and back are reversed to the position before. Referring to FIG. 15, the upper left corner of the glass plate 523 is used as a system reference point and the original placed so that its left edge serves as a reference line. Therefore, the top side and the bottom side are swapped in the Y direction of the template.

In this way, the template 521 is placed with its left edge as the reference line, in reverse to the support on the template pressure plate 520 on the glass plate 523 . Therefore, the position value read in by means of the touch field with regard to the X direction is essentially identical to the actual position of the original 521 on the glass plate 523 , but there is an opposing relationship with respect to the Y direction between such points.

Referring to FIG. 16, the particular to a Berührungstastfeld 531 analog coordinate data by an A / D converter are converted into digital data 532nd This digital data is input into a central unit 534 and converted and further stored in a memory (RAM) 535 . The signal processed by the central unit 534 is fed to a driver circuit 536 , by means of which the blinking of light-emitting diodes of a light-emitting diode line 537 is controlled.

The switching of the light-emitting diode line 537 or 504 is carried out with regard to the direction of the scanning of the original (X direction) in accordance with the point in time at which the position of the drum corresponding to the value X1 reaches the light-emitting diode line 504 and in accordance with the time through which the drum point of X1 passes controlled to X2. With regard to the direction perpendicular to the direction of the scanning of the original (Y direction), the switching of the light-emitting diode row is controlled in such a way that a number of the light-emitting diodes is switched on. Although the original is placed on the glass plate in the opposite direction to the position on the touch panel, the central unit 534 corrects this.

The exemplary embodiment according to FIG. 11 is explained in more detail below. The photosensitive drum 501 is charged uniformly with the charger 502 . With the image light 503 , the drum 501 is exposed image-wise so that the charge image is generated. The charge image for a non-selected area of the original is deleted in the manner described above by means of the LED line 504 or 537 . In this way, the charge image is generated only for that area of the original which is determined by the points (X1, Y1) and (X2, Y2). The charge image for the selected area is developed using a red developing device 505 . To prevent developing in black, a black developing device 506 is placed in a position sufficiently far from the drum 501 , or a bias voltage is applied to the black developing device 506 with a polarity such that the attraction of the black Toner to the photosensitive material is prevented, whereby the development in black is avoided. The image developed or made visible with the red toner is transferred electrostatically by means of a transfer charger 507 to image-receiving material 509 , which is conveyed through a paper feed guide 510 . The image-receiving material 509 is released from the drum 501 by means of a separating unloader 508 and conveyed further by means of a conveyor device 511 . By means of a fixing device 512, the image 19202 00070 552 00004 001000280000000200012000285911909100040 0002003605472 19083auf is fixed to the image receiving material 509th For multiple copying, the image receiving material with the fixed image is returned with a switch 513 via a conveyor track 514 to a location near the paper feed guide 510 .

After the transfer, the toner remaining on the drum 501 is removed by a cleaning device 515 . A charge erase lamp 516 equalizes the potential on the drum, after which the copying cycle for the generation of the next black image is carried out. In the same manner as in the previous copying cycle, a charge image corresponding to the image light 503 from the original is generated on the drum 501 loaded uniformly with the loader 502 . In this case, however, contrary to the charge image for the selected area deleted in the previous cycle, the charge image for the area not deleted in the previous cycle is deleted by means of the LED line 504 ( 537 ) (in which case the area to be deleted and the area not to be deleted area to be deleted can be completely redetermined).

The image data in the selected area obtained in the previous cycle is stored in the memory (RAM) 535 . In the second cycle, the central unit 534 reads out and converts the image data from the memory 535 , whereby the switch-on time and the switch-on number of the light-emitting diodes of the light-emitting diode row 537 are controlled in such a way that the light-emitting diodes which are switched on are essentially those which are not switched on in the previous cycle or are the LEDs are switched on in the opposite direction to those in the previous cycle.

The charge image area not erased in the second cycle is developed by the black developing device 506 . Therefore, as in the previous cycle, the black developing device 506 is now placed in the red developing device 505 in a position remote from the drum 501 . Alternatively, such a bias is applied to the red developing device 505 in contact with the drum 501 that there is no development in red. The copy paper developed in the previous cycle with the red toner is fed by means of a registration roller 517 under a timing which is correct according to the position of the image on the drum. The image developed or made visible with the black toner is electrostatically transferred to this copy paper using the transfer charger 507 . Then the paper is released from the drum 501 with the separating unloader 508 and conveyed on by means of the conveying device 511 . Then the image is fixed by means of the fixing device 512 . The paper is then discharged using the switch 513 , so that the two-color copy is automatically obtained.

The operation of the developing devices in automatically generating the two-tone copy will now be described with reference to FIG. 17.

In general, when using developers Multi-color mechanical fixtures  Way the development devices not to be used by means of a plunger, an eccentric cam or the like at a distance from the photosensitive drum brought up heads for applying developer closed a development cylinder or the like.

On the other hand, when it comes to skip development Developer not using the photosensitive drum Contact; therefore this procedure is regarding the Preventing color mixing compared to magnetic brush most advantageous from two components. In some cases it is also sufficient just the development bias to use. It can be seen that also in this In this case, the color mixture becomes even more reliable can be changed that for the unused developers tion devices the mechanical device for the Avoid using the color mix.

If the area, the color assignment and the color type are selected by pressing buttons on an operating panel 540 according to FIG. 17 and then the copy start button is pressed, the device is operated by means of the central unit 534 in the automatic two-color copying mode.

The operation when the output voltage of a high voltage converter 541 for red development is applied to the red developing device 505 when copying an area selected for display in color in red will now be described.

The set value of a density adjuster (not shown) is input to the CPU 534 and converted such that a DC bias control signal is input to the high voltage converter 541 through a D / A converter 539 . This control signal is input to a differential amplifier 542 and then to a DC / DC converter 543 . Further, a signal from a tunable oscillator 546 is input to the converter 543 . A pulse current generated by a pulse generator 548 is amplified by a current amplifier 549 and then stepped up with an step-up transformer 544 . The increased by the step-up transformer 544 AC component is added to the output signal of the converter 543 . The output signal of the step-up transformer 544 is applied to the red developing device 505 . In this case, a DC bias switch 545 and an AC bias switch 547 of the high voltage converter 541 are switched to generate high DC voltage and high AC voltage.

On the other hand, in a high-voltage converter 550 for black development by a signal from the central unit 534, the delivery of an AC voltage is blocked and by switching on a DC bias switch 545 'only a high DC voltage is output, which is controlled so that the black toner from the Black developing device 506 is not attached to the drum.

A black color second color copying program stored in a ROM 538 will now be explained. In this case, contrary to copying in red, the DC and AC components from the high voltage converter 550 are turned on for the black development in the same manner as in the red development. In contrast, in the high voltage converter 541 for red development, the high AC voltage is turned off, while the high DC voltage is controlled to such a voltage that no red toner from the red developing device is applied to the drum.

It was described above that the two high span conversion converter for red development and black development winding were used. However, if the development properties for red and black are the same it is also possible in connection with the fix and Removing the developing devices a common High voltage converter for a single color development too use. Furthermore, the transformer for the high AC voltage can be shared while geson derte converter provided for the high DC voltage become.

In the exemplary embodiments, the range was selected the digitizing or touch panel used, each but there is no limitation to this; rather can a method is used in which the coordinates the template can be read and entered with keys.

The operation for the automatic two-color copying by selecting an area by key input will now be described with reference to FIG. 18.

First, for an area selected by pressing an area selection key 630 , copying within the area ( 631 ) or copying outside the area ( 632 ) is selected. The selected copy type is indicated with LEDs 633 or 634 . Next, pressing a color selection key 640 determines the color for the selected area. If, for example, the image in the interior of the selected area is to be copied in color, the interior area is selected using the area selection button 630 ( 631 ) and the color ( 641 ) is selected using the color selection button 640 . Next, using a number keys 670, the coordinates of the selected area are determined by entering two points on a diagonal of the rectangular area. That is, an input key 671 is pressed, after which the coordinates (X1, Y1) and (X2, Y2) are entered. After the respective coordinates have been entered, the entry of the coordinates is ended by pressing the enter key 671 (*) again. This entry is made regardless of how many copies are set. For example, for X1 = 10, Y1 = 5, X2 = 20 and Y2 = 15 the following key entry is made:

* 1 0 * 5 * 2 0 * 1 5 *

Next, two keys 661 and 662 are selected. That is, if the key 661 is selected, only the specific area is copied in a single color selected by a color key 660 . In the other case, when the button 662 is selected, the selected area is copied in a selected single color, after which the other areas are then copied in a non-selected other color (such as black), namely the automatic two-color copying is carried out.

In this way, a copy start button 680 only has to be pressed after the area selection, the color selection, the coordinate determination and the color type selection.

Another method may also be considered in which the color key 660 is not provided, but respective display fields 661 and 662 are used as copy keys for color copying.

Only one was used in the exemplary embodiments  rectangular area selected, but two can also or more areas or an area in complicated form be selected when the touch keypad, the Zen tral unit and the memory each sufficient capacity have acted

Furthermore, although in the embodiments Development devices for black and color (at red, for example), but it's obvious that also two color development devices (for example for red and green) can be used. The inventive design is also in use applicable by two or more developing devices. Although as a charge extinguishing device, the LED line was used, on the other hand, other before directions such as a liquid crystal shutter line or the like can be used.

FIG. 19 is a diagram showing another example of exporting approximately the copying machine. In this embodiment, two different areas can be selected and these areas can be copied in different colors.

Fig. 19 shows the control panel in this example embodiment.

The control panel basically includes an area selection key 730 , a color selection key 740 and a coordinate selection key 750 . Since the control panel according to this embodiment is one for a multi-color copier having two colors such as red and black, the color selection key 740 has a red selection key 741 and a black selection key 743 .

The operation in automatic two-color copying under area selection by key input will now be described with reference to FIG. 19. First, for range selection , an enter key 731 for range selection key 730 is pressed to set the range selection mode. Next, the color selection key 741 or 743 for the color selection key 740 is pressed to select the color for the selected area.

To copy the area designated by the points (X1, Y1) and (X2, Y2) in red, the red selection key 741 is pressed. By pressing the red selection button 741 , an indicator light 742 is switched on. At the same time, a light-emitting diode 752 for the points (X1, Y1) and (X2, Y2) on a coordinate selection field 751 is switched on, whereby the entry of the coordinates is commanded. By entering the coordinates using the touch pad on the master pressure plate 520, the coordinate values on the coordinate selection field 751 are displayed.

Subsequently, in order to copy the area designated by dots (X3, Y3) and (X4, Y4) in black, the area selection key 730 and the black selection key 743 for the color selection key are pressed. After determining the lighting of a light-emitting diode 744 and a light-emitting diode 753 on the coordinate selection field 751 , the coordinates (X3, Y3) and (X4, Y4) are entered via the touch key field. The respective coordinates are displayed on the coordinate selection field 751 .

Next, pressing enter 731 will report the end of the entry.

After the original has been placed on the glass plate 523 , the number of copies is set by means of a keyboard 760 and a copy start key 770 is pressed as in the ordinary copying, whereby the copying process is initiated.

The coordinates selected with the touch pad according to the method described above be stored in the memory (RAM) 535 .

In the same manner as in the first color copying in the above-described embodiment, when the charge image is formed on the photosensitive drum, only the area of the original defined by the points (X1, Y1) and (X2, Y2) is made by the red developing device 505 developed. Meanwhile, the black developing device 506 is controlled in the same manner as in the above-described embodiment.

In the same way as that described above Embodiment is the developed image on the Image receiving paper transferred and the copy cycle for the second color executed.

In the same way as in the previous copying cycle, the charge image corresponding to the image light 503 from the original is generated on the drum 501 previously loaded uniformly by means of the loader 502 . In this case, however, the charge image for the area other than the through the points (X3, Y3) and (X4, Y4) specified area is cleared for the black copy by using the LED array 504th

The image data for the selected area are stored in the memory 535 . During the copying cycle, this data is read from the central unit 534 from the memory 535 and converted. The on times of the light emitting diodes of the light emitting diode row 504 and their number are controlled in such a way that the light emitting diodes corresponding to the points (X3, Y3) and (X4, Y4) are switched on.

Since the image of the area designated by the points (X3, Y3) and (X4, Y4) is developed by the black developing device 506 in this second copying cycle, the black developing device 506 now becomes the red developing device 505 in a manner similar to the previous cycle offset sufficiently far from the drum 501 or a bias voltage is applied with such a polarity that no red toner is applied to the photosensitive material. The image developed or made visible with the black toner is transferred to the image-receiving paper under a timing which corresponds to the position of the image on the drum, which is fed by means of the registration roller 517 in the same way as in the embodiment described above and which is then discharged from the device becomes.

With the copying process described above, auto receive a two-tone copy, in which two selected areas in different colors are developed.

Two-color copying was used as an example Multiple copying described in the embodiment, however, two-sided copying can be selected if a copy is to be made with the selected ones Areas in different colors on the at the sides of the copy paper are copied. In this case only need to follow the procedure described above after fixing the copy in the first color and before  leading back to the paper feed point side and back of the copy paper swapped become.

In the embodiment described above the two-color copying was shown, however can also be used for copying in three or more colors multicolored copying can be achieved by meh more development devices are provided and in the same way as in the above described example, the copying cycles are repeated.

The copier according to the invention can also be a digital one Copier, where the original is on photoelectric Read way and an image signal as a digital signal is processed. In this case only that has to be chosen appropriate area to the printer be.

Claims (18)

1. Electrophotographic copier with
a template area determining device for determining a first and a second template partial area, the template area determining device enabling the determination of two template partial areas independently of one another,
Devices for generating charge images of the first and second template sub-areas defined by the template area determining device during successive image generation processes, key input devices for specifying the respective color with which the charge images of the first and second template sub-areas are to be developed, and
first and second development devices with developers of different colors, which are controlled by a control device in the successive copying processes depending on the respective specification of the key input devices for developing the first and the second partial area in different colors,
characterized in that
the template area determining means consists of means for setting two-dimensional coordinates of a template support area on which the template is placed, and
the control device is constructed such that it

• - after commands of the area selection mode for the first template section by means of a display device prompts an operator to completely enter the data required to determine the first template section and the color with which the charge image of the first template section is to be developed,
• - after the range selection mode for the second template sub-area has been instructed, the display device prompts the operator to enter all the data required to determine the second template sub-area and the color with which the charge image of the second template sub-area is to be developed, and
• - After actuation of a copy start key, the development of the charge image of the first template sub-area defined by the template area determination device in the assigned first color and the charge image of the second template sub-area defined by the template area determination device in the assigned second color are initiated.

2. Copier according to claim 1, characterized in that an inside / outside button ( 138 ; 631 , 632 ) is provided, by means of which it is possible to set whether the template area determined by the template area determining device lies within or outside the specified coordinates. 3. Copier according to one of the preceding claims, characterized in that the original area determining device is formed by a numeric keypad ( 101 to 110 ; 670 ; 760 ). 4. Copier according to one of claims 1 or 2, characterized in that the original area determining device has an image sensor ( 18 ) which detects the coordinates of markings made on the original. 5. Copier according to one of claims 1 or 2, characterized in that the original area determining device has a arranged on the original plate, consisting of transparent electrodes touch keypad ( 304 ) and a pressure pen ( 252 , 253 ). 6. Copier according to claim 5, characterized in that the setting of the coordinates of original sub-areas is carried out by pressing the pressure pen ( 252 , 253 ) on the touch pad ( 304 ). 7. Copier according to one of the preceding claims, characterized in that at the edge of the template plate light-emitting diode lines ( 309 , 310 ) are provided, the light-emitting diodes of which indicate the template area determined by means of the template area determination device. 8. Copier according to one of claims 1, 2 or 7, characterized in that the template area determination device has operating elements which enable the setting of the template sub-areas by selective switching on and off of the LEDs of the LED rows ( 309 , 310 ). 9. Copier according to one of the preceding claims, characterized in that the coordinates entered via the template area determination device are displayed on the display device ( 156 ; 751 ). 10. Copier according to one of the preceding claims, characterized in that when copying, a charge image is first generated, the full picture of the template to be copied corresponds, and that before the development of the charge pattern each outside of the template area Determining device for certain sub-areas of the template lying charge image areas by means of a Extinguishing device to be deleted. 11. Copier according to one of the preceding claims, characterized in that upon pressing the copy start button Prescan to determine the original size and Location of the template is carried out on the platen. 12. Copier according to claim 11, characterized in that an alarm indicator is activated and copying is blocked if the template is slanted and / or related a normal support position offset on the support is on the hook. 13. Copier according to claim 12, characterized in that an alarm switch to cancel the alarm and to Execution of copying is provided.   14. Copier according to claim 12, characterized in that the alarm display ( 156 ) is switched off and the copying is carried out when the copy start key is pressed again. 15. Copier according to one of the preceding claims, characterized in that an automatic copy sheet selector is provided, which depends on the selected Reproduction scale and depending on the format of the copying template sections a suitable Select copy sheet size. 16. Copier according to one of claims 1-14, characterized in that an automatic magnification selection direction is provided, which depending on selected copy sheet format and depending on Format of the template sections to be copied select a suitable image scale. 17. Copier according to one of the preceding claims, characterized in that the first developing device in one Development position and yourself the second development device is in a non-development position, when the charge image develops in the first color should be, and that the first development  direction in the non-development position and the second development device in the development position on if the charge image is in the second color should be developed. 18. Copier according to one of claims 1 to 16, characterized in that to the first developing device Development bias is applied, which is a developing of the charge image in the first color, and on the second developing device is developing before voltage is applied, which is the development of the Prevents charge image in the second color if that Charge image to be developed in the first color and that to the first developing device Development bias is applied, which is a developing of the charge image in the first color prevented, and on the second developing device is developing before voltage is applied, which is the development of the Charge image in the second color allows if that Charge image to be developed in the second color.