JPH0193756A - Simultaneous multicolor copying machine - Google Patents

Abstract

PURPOSE:To prevent the omission of images when multicolor images are formed by reducing images to a sheet size selecting an image including an imprinting member placed on an original platen by a variable magnification mode. CONSTITUTION:When a copying magnification called as anamorphic variable magnification is changed, a scanning unit 112 and a common holder 113 operate to correspond with the copying magnification, however, a lens 116 and mirrors 117 and 118 do not operate similarly. When such an optical system 3 scans an original image, optical image corresponding to the original image is projected on a photosensitive drum 1, which forms electrostatic latent image. A 1st or 2nd developing device 4 or 5 is selectively driven, supplies toner to the electrostatic latent image and makes it visible. The 1st developing device 4 contains developer consisting of magnetic carries and insulating color toner, while the 2nd developing unit 5 contains developer consisting of magnetic carrier and normally used insulating black toner. By replacing the whole developing device with assembly, toner of any color can be selected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a simultaneous multicolor copying machine capable of developing an electrostatic latent image formed by -times of exposure scanning using a plurality of developing devices. More specifically, the present invention relates to a simultaneous multicolor copying machine in which an imprinting member is disposed near the document table.

[Prior Art] Conventionally, it has been proposed to dispose an imprinting member near the document table of a copying machine (Japanese Utility Model Publication No. 60-3840, Japanese Utility Model Application Publication No. 60-23858).

This imprinting member has an image such as a title, a mark, a company name, etc., and is placed on a document table together with a document to be copied.

Also, a copying machine capable of synthetic copying has been proposed.

This copying machine is equipped with a refeeding device for copied copy paper.

That is, by temporarily storing the paper on which a copy image has been formed on one side by the above-mentioned paper refeeding device and refeeding the paper to the image forming section of the copying machine, a copy image is once again printed on the paper surface on which the copy image has already been formed. allow to form. Then, a composite copy image is formed on the same side of the copy paper.

Furthermore, electrophotographic copying machines have conventionally been provided in which the color of toner forming a copied image can be changed. This can be done by, for example, replacing one developing device installed in a copying machine from one for ordinary black toner to one for color toner, or by having two or more developing devices each containing toner of different colors. In a copying machine that can be used selectively, this is done by selecting a developing device through an operator's operation.

[Problems to be Solved by the Invention] Incidentally, since the image imprinted onto the paper by the imprinting member is a title, company name, etc., there is a desire to make this stand out. For this reason, it is conceivable that only the portion of the image that is imprinted by the imprinting member is made to have a different toner color.

Such a change in toner color of a partial image is possible by combining the copying machine capable of composite copying and the copying machine capable of developing by changing the toner color. That is, 1
The first time, only the image on the imprinting member is developed with color toner and copied, and the second time, the area where the imprinting member will be placed is left as a margin, and the original is placed on the document table, and the image is developed with black toner, for example. Copy.

However, in such a combination, firstly, switching or replacing the developing device is troublesome. Furthermore, replacing the original with the imprinting member is also a hassle. Second, it is difficult to position the imprinting member and other original images, and when compositing, images may be misaligned and colors may be mixed.

Furthermore, if an attempt is made to copy the image of the imprinting member and the image of the original paper onto copy paper of the same size as the original at the same size, the area occupied by the imprinting member and the original image will be lost.

The present invention has been devised in view of the above-mentioned circumstances, and it is an object of the present invention to easily set a copying magnification regarding reduction so that image loss does not occur when an imprinting member is placed on a document table. It is an object of the present invention to provide a copying machine which is capable of automatically making the developed toner color of the copied image of the imprinting member different from the developed toner color of the copied image of other parts.

[Means for Solving the Problems] The simultaneous multicolor copying machine according to the present invention scans the original image on the original platen for exposure, and performs scanning according to the magnification command.
A light image projection means for projecting a light image; a photoconductor on which an electrostatic latent image is formed by the light image projected by the light image projection means; and two or more developing devices for developing the electrostatic latent image with toner. a paper feeding means for feeding paper onto which the developed toner image is transferred and fixed near the photoreceptor; and an imprinting member placed on a specific area on the document table as necessary. , a detection means for detecting whether or not the imprinting member is placed on the document table; a variable magnification mode designation switch for setting a variable magnification mode; and a variable magnification mode designation switch for setting a variable magnification mode; magnification change command means for issuing a magnification command regarding reduction determined by the size of the paper to be fed and the size of the imprinting member to the optical image projection means; When it is detected that the imprinting member is placed, an area on the photoconductor corresponding to the specific area on the document table where the imprinting member is placed, and an area outside the specific area where the imprinting member is placed. In the area on the photoreceptor, a developer drive υJ is used to drive and control the developer to develop the electrostatic latent image formed by one exposure scan using different developers.
li1 means.

[Embodiment] Hereinafter, one embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic partial cross-sectional view showing a copying machine according to this embodiment.

As shown in FIG. 1, the copying machine according to this example has an image forming section centered on a photoreceptor drum 1 at approximately medium heat, and above the image forming section is an optical system for exposing and scanning a document. 3, a paper feed section is disposed on the left side of the copying machine, and a fixing and ejection section are disposed on the right side of the copying machine.

In the image forming section, the photoreceptor drum 1 is rotatably supported by a shaft, and a charger 2, a first developer 4, a second developer 5, and a transfer device are arranged around the photoreceptor drum 1 in the direction of rotation (direction of arrow a). Charger 6, separation charger 7, cleaning device 8, and eraser lamp 9 are sequentially removed.

In the image forming section, first, a constant charge is applied to the surface of the photosensitive drum 1 by the charger 2, and a corresponding electrostatic latent image is formed by projecting a light image from the optical system 3.

The optical system 3 starts from below the original glass 44.
It is installed so that the original image of the original placed on it can be scanned, and includes a slit exposure type light source 110 and a first movable mirror 11.
1, and a second and third movable mirror 114 held by a common holder 113.
115, variable magnification lens 116, and mirror 117.11
8. It consists of 11 things. Further, a reed switch 39 is disposed at one end of the upper part of the scanning unit 112.

The scanning unit 112 detects the peripheral speed (■) of the photoreceptor drum 1 (
It moves to the left at a speed of (V/m) (where m is the copying magnification), and the common holder 1
13 is driven by a DC motor (not shown) so as to move to the left at a speed of (v/2m> The lens 1 is not driven by a stepping motor.
16 moves on the optical axis, and the mirror 117.11
This involves the movement of 8.

In addition, when changing the special copying magnification called analog magnification (changing the size of the original image and copy image only in the scanning direction, and maintaining the sameness of the image in the direction orthogonal to the scanning direction), the above-mentioned scanning Unit 112, common holder 1
13 operates according to the copying magnification, and the lens 116
, mirrors 117,118 are not activated.

As the optical system 3 scans the original image, a light image corresponding to the original image is projected onto the photosensitive drum 1, thereby forming the electrostatic latent image. Further, as will be described later, the first developing device 4 or the second developing device 5 is selectively driven to supply toner to the electrostatic latent image and convert it into a pA image.

In this embodiment, the first developing device 4 contains a developer consisting of a magnetic carrier and an insulating color toner, and the second developing device 5 contains a developer consisting of a magnetic carrier and a normally used insulating color toner. A developer consisting of black toner is contained therein. Note that by replacing the entire developing unit in the assembly, any toner color can be selected.

The paper feeding section includes a first paper feeding section 20 including a paper feeding roller 21;
The second paper feed section 22 includes a paper feed roller 3 . Further, the first paper feeding section 2o has a second cassette 20a.
A cassette 22a is attached to the paper feed section 22.

On the other hand, a copy paper conveyance path is constituted by a pair of rollers 24, 25, 31, a pair of timing rollers 26, a conveyor belt 27, a pair of fixing rollers 28, and a pair of discharge rollers 29,30.

As shown in FIG. 8, in the first paper feeding section 20, on the copying machine main body side near the front end of the mounting position of the cassette 20a,
Switch 80.81.82 for outputting the size signal
and 83 are arranged parallel to the cassette front end surface 20a-1 and at a position where they can be operated by the cassette front end surface 20a-1.

The switch 80 on the cassette front end surface 20a-1
In the part facing 181.82.83, there is a cassette 2
A cord part (C) is formed to turn each switch on and off in a predetermined combination by attaching the 0a to the copying machine body. Identifies the size of copy paper being used. The cord portion (C) is associated with a control means described later so that, for example, when the concave portion faces the switch, the switch is not pressed and an output of 1” is obtained. It is possible to identify 24-16 different sizes based on the pattern of concave and convex portions in the width (d) part of the center.Therefore, in the example of Fig. 8, the codes indicating the sizes are shown in the order of switches 83, 82, 81, and 80. , (0010) is output.

Similarly, in the second paper feeding section 22, the cassette 22
Switches 84, 85, 86, and 87 for outputting a size signal are disposed on the copying machine side near the front end of the mounting position a.

The timing roller pair 26 aligns its leading edge with the toner image forming area formed on the photoreceptor drum and sends out the copy paper fed from the paper feed section to the vicinity of the photoreceptor. The delivered copy paper has a toner image transferred thereto by a transfer charger 6, is separated from the surface of the photoreceptor drum 1 by a separation charger 7, passes through a conveyor belt 27, and the toner is melted and fixed by a pair of fixing rollers 28. After the discharge roller pair 29.30
Then, it is discharged onto a discharge tray 32 outside the machine.

On the other hand, after the toner image transfer paper is separated, the remaining toner on the surface of the photosensitive drum 1 is scraped off by the cleaning device 8, and the remaining charge is erased by light irradiation from the eraser lamp 9, and the photosensitive drum 1 is used for the next development. Prepare for.

FIG. 2 is a perspective view showing the upper part of the copying machine. The upper part of the copying machine generally includes a document glass 44, a document feeder 45, a second lever 36 for specifying a color area, and a second lever 36 for specifying a color area.
Lever 36, imprint member 400, and operation panel 10
0,150 are arranged.

(Description of Imprinting Member 400) As shown in FIG. 7, the imprinting member (hereinafter referred to as title plate) 400 includes a base plate 401, a title display portion 402 formed on one surface of the base plate 401, and It is comprised of a protrusion 405 for operating a title plate detection switch 502 (see FIG. 2), and is configured to be rotatable around an auxiliary shaft neck 403.

When the title plate 400 is tilted toward the document table glass 44, a recess is provided at the top of the copying machine corresponding to the protrusion 405 of the title plate 400, and the title protrusion 405 fits into this recess. When inserted, the title plate detection switch 502 provided in the recess is turned on. In addition,
When the title plate 400 is placed on the document platen glass 44, the first developing device 4 and the second developing device 5 are selectively driven as described later, and the document platen 4 corresponding to the title plate 400 is moved.
The image in the longitudinal area No. 4 is developed with color toner, and the image in other areas is developed with black toner to form a copy image.

Further, the base plate 401 has a substantially wedge-shaped cross section (see FIG. 7), and as shown in FIG. 10, the title plate 400
When the title plate 400 is tilted in the opposite direction to the document platen glass 44 with the title display portion 402 facing up, the title plate 400 serves as a paper guide plate of the document feeding device. That is, as shown in FIG.
5 includes a document placement section 451 and a document transport section 452 in the membrane.
(also used as a document presser), and the title plate 400 constitutes a paper conveyance path when the document placed on the document placement section 451 is fed to the document conveyance section 452. Further, in this embodiment, the title display section 402 is constructed by pasting an arbitrary mark or the like on the surface of the base plate 401. However, the title display section 402 may be configured to include a liquid crystal display element, and may be configured to be operable to display an arbitrary shape, etc., on an operation panel, which will be described later, for example.

(Description of the operation panels 100 and 150) As shown in FIG. 2, the operation panel 100 includes a print start key 101, a simultaneous two-color copy mode designation switch 501, and a simultaneous two-color copy mode display LED 12
0, a numerical display section 160, etc. are provided.

Further, as shown in FIG. 9, on the operation panel 150, there are a variable 8 mode selection key 504 for selecting automatic reduction mode or automatic analog mode, a developer selection key 503, an automatic reduction mode display LED 213, and an automatic analog mode display L.
ED214, color display section 2 of the selected developing device
15 are arranged.

Here, in the automatic reduction mode and the automatic analog mode, when trying to form a copy image on paper of the same size as the original, if you try to copy the title display area 402 together with the original, the image will be lost by the amount of the title board 400. This mode is selected to prevent this from occurring (see FIGS. 11(a) and 11(b)). That is, the automatic reduction mode on the operation panel 150 means that when the title plate 400 is placed on the document glass 441, the image including the selected paper size of the cassette and the title plate 400 is reduced to the selected paper size. This is a copy mode in which the image is reduced uniformly in both the width and length directions (Figure 11). In this embodiment, if the size in the feeding direction of the copy paper stored in the cassette of the selected paper feeding section is λ, and the length of the title plate 400 in the same direction is b, then the reduction magnification is (R /(λ+b)
) is given twice. Further, the first paper feeding section 20. Selection of the second paper feed section 22 is performed by a switch (not shown) on the operation panel 100. Here, the above sentence is detected based on the copy paper size signal (by switches 80-87).

In addition, the automatic analog mode on the operation panel 150 means that when the title plate 400 is placed on the document platen glass 44, the positions of the lens 116, etc. are kept the same, and the scanning unit 112 is
This is a copy mode in which the image is contracted in the length direction while keeping the short side direction of the document table glass the same by increasing only the scanning speed by a predetermined speed compared to the normal speed (FIG. 11 (1)). Incidentally, the analog magnification ratio in this embodiment is (R/J!+b), where the size of the copy paper in the paper feeding direction is ``text'' and the length of the title plate 400 in the same direction is b.

(Description of the levers 35 and 36) The first lever 35 and the second lever 36 are disposed so as to be movable in the long direction of the original glass 44, and are used to divide the development area by the two developing devices. In this embodiment, when the simultaneous two-color copy mode switch 501 is turned on, the second lever 3
The area sandwiched between 5 and the second lever 36 is used for color development (first
The other areas are defined as black and white development areas (development by the second developing unit 5).

Further, as shown in FIG. 1, a magnet 37 is placed at the bottom of the first lever 35, and a magnet 38 is placed at the bottom of the second lever 36.
is installed. Then, when the scanning unit 112 scans the document image, when the reed switch 39 disposed on the scanning unit 112 moves to the position of the magnet 37 or 38, the reed switch 39 is turned on, and the second lever 35 and the second lever The position of 36 is detected.

Next, the structure and operation of the first developing device 4 and the second developing device 5 will be explained with reference to FIGS. 3 to 6.

Since the second developing device 5 has the same configuration as the first developing device 4, the configuration will be explained using the first developing device 4 as an example. Figure 3,
As shown in FIG. 4, the first developing device 4 includes a developing device 111,
It is composed of a sleeve roller 12, a magnet roller 13, a supply roller 14, and a screw 15.

In the above-mentioned developing device, the screw 15 rotates in the clockwise direction d to convey toner replenished from a toner bottle (not shown) to the supply roller 14 side, and its spindle 15a
are supported by the side walls of the developer tank 11 at both ends.

The supply roller 14 rotates in the clockwise direction C to mix and stir the toner and developer, and supplies the developer onto the sleeve roller 12. Its supporting shaft 1'4a is connected to the side wall of the developer tank 11 at both ends. Supported.

The supply roller 14 and the screw 15 are respectively arranged in transport paths 16 and 17 separated by a partition wall 18, and the transport paths 16 and 17 communicate with each other at both ends of the image forming tank 11.

The sleeve roller 12 is made of a non-magnetic conductive material,
A magnet roller 13 is built-in. Further, the sleeve roller 12 rotates in the clockwise direction d independently of the magnet roller 13, thereby supplying the toner supplied by the supply roller 14 to the developing area on the photoreceptor. The sleeve roller 12 is supported at one side end of the developer tank 11 by a support shaft 12a, and the magnetic roller 13 is supported by a bearing portion 12b.
It is supported by a support shaft 13b.

In the developing device 4, the support shaft 12 of the sleeve roller 12
A belt 21 is hung between the support shaft 14a of the supply roller 514 and the support shaft 14a of the supply roller 14, and the support shaft 14a of the supply roller 514 and the screw 15
A belt 22 is also hung on the support shaft 15a.

A gear 23 is attached to the end of the support shaft 14a of the supply roller 14, and this gear 23 meshes with a drive gear 25 of the first developer motor 24.

Therefore, the first developer motor 24 is driven and the drive gear 25 is
When rotated in the direction of the solid line shown in FIG. 4, the gear 23 and belts 21 and 22 move in the direction of the solid line, respectively, and rotate the sleeve roller 12, supply roller 14, and screw 15 in the directions of arrows S, C, and D, respectively. .

Note that, on the back side of the developing area of the sleeve roller 12, a brush height regulating portion 19 is provided on the upper inner surface of the developing MJ 11.

The magnet roller 13 is built into the sleeve roller 12 and has a plurality of magnets extending in the axial direction. In addition, the magnetic poles located on the outer peripheral surface of these magnets are 5 poles (Nl-N3
, Sl, S2) are asymmetric, N1 is the main pole with the strongest magnetic force, and during development, development is performed at a position opposite to N1. The magnet roller 13 is
One end 13a of the spindle is supported in a bearing recess 12c provided inside the sleeve roller 12, and the other end 13b of the spindle is supported by a bearing recess 12c provided inside the sleeve roller 12.
is supported on the side wall of the developer tank 11, and is moved at a predetermined angle (θ-
40°) can be rotated.

The displacement means 30 for the magnet roller 13 is shown in FIG.
゛As shown in Fig. 6, the lever 31 and the spring 32
and a solenoid 33, and a lever 31
The center portion of the magnet roller 13 is fixed to the end of the support shaft 13b of the magnet roller 13, and one end of a spring 32 fixed to the developer tank 11 is attached to one end of the center portion, and is always biased in the e direction.

A plunger 34 of a solenoid 33 is locked to the other end of the lever 31, and when the solenoid 33 is driven, the lever 31 is rotated in the direction of arrow e' against the biasing force of the spring 32. .

When the solenoid 33 is not driven (off), that is, when the lever 31 is in the state shown in FIG. 5, the magnetic pole N1 of the magnet roller 13 faces the photosensitive drum 1.

Conversely, when the solenoid 33 is activated and turned on), the lever 31
is in the state shown in FIG.
An intermediate portion between the magnetic pole S1 and the magnetic pole 8iN1 faces the photosensitive drum 1.

The above-mentioned developing device is used during development (Fig. 3, second developing device 5
), the magnet l1iN1 is positioned so as to face the developing area X' (solenoid 33' off), and the sleeve roller 12 rotates clockwise (motor 24'
on). The developer supplied by the supply roller 14 first creates a reference developer height by the height regulating section 19 and the magnetic poles N3 and S2.

Next, in a region X' on the photoreceptor facing the magnetic pole N1, a peak is formed by N1, Sl, and S2, which have the strongest magnetic force, and the electrostatic latent image is developed with toner. The developer used for development is transferred to the developer tank 1 by the sleeve roller 12 again.
1 and leaves the sleeve roller 12 at a position where there is no magnetic field between N2 and N3.

On the other hand, during non-development (see FIG. 3, first developing device 4), the intermediate portion between the magnetic pole S1 and the magnetic pole N1 faces the photoreceptor (
Solenoid 33 ON). Further, the sleeve roller 12 is stopped (motor 24 is off).

Hereinafter, a case in which an electrostatic latent image formed by one exposure scan in the above-mentioned copying apparatus is subjected to two-color copying using the developing unit 4.5 (referred to as simultaneous two-color copying) will be schematically explained using FIG. Explain.

First, when the scanning unit 112 performs slit exposure on a specific point on the document glass 44, the electrostatic latent image of the document image is located at a position W on the photosensitive drum 1 shown in FIG.

The electrostatic latent image at the position W is developed by the first developing device 4.
In order to visualize the latent image, it is necessary to move the latent image from the position W to the first developing device 4.
Development can be started after moving to the position of the development area X. That is, the time required for the latent image to move from the position W to the position of the development area X. After the time elapses, the first developer motor 24 is turned on, the first developer solenoid 33 is turned off, and color development by the first developer 4 is started.

Further, the electrostatic latent image at the position W on the photoconductor is transferred to the first developing device 4.
In order to complete the development, it is sufficient to turn off the first developer motor 24 and turn on the first developer solenoid 33 after t1 time from the time when the latent image is at the position W.

On the other hand, in order for the latent image at the position W on the photoreceptor to move to the development area
In other words, in order to develop the latent image at the position W on the photoreceptor with the second developing device 5, after the time (t, +t2) has elapsed since the latent image was at the position W. For example, approximately 12 hours after the latent image is in the first development area
The second developer motor 24' is turned on, and the second developer solenoid 33' is turned off.

Furthermore, in order to complete the development of the latent image at the position W on the photoreceptor by the second developing device 5, after a period of time (t 1 + t , z ) has elapsed since the latent image was at the position W, 2nd vA
Turn off the imager motor 24- and turn off the second developing solenoid 33'.
Turn on.

In this embodiment, in the case of simultaneous two-color copying using the levers 35 and 36, the position at which to switch from black to color development on the original image on the document platen glass 44 is detected using the magnets 37 and 38 attached to the lower part of the lever. and the reed switch 39.

On the other hand, in the case of simultaneous two-color copying using a title board,
A time t has elapsed since the scanning unit 112 reached the predetermined position.
The electrostatic latent image at point W on the photoreceptor at a time point after T is switched from color to black and developed. This time t1-
is determined by (the time required for the scanning unit to scan the length of the timer plate 400 in the scanning direction)×(reduction magnification in the scanning direction), and is given by software by the control means described later.

(Description of the control means of the above-mentioned copying machine) The above-mentioned copying machine! The IJ 111 means is mainly composed of a CPU (not shown), which includes a group of keys on the operation panel, paper size detection switches 80 to 87 for copy paper stored in the paper feed cassettes 20a and 22a, and a lever position detection lead. A switch matrix in which three switches and other various switches and sensors inside the copying machine are arranged vertically and horizontally is connected. It is also connected to a group of display LEDs on the operation panels 100, 150 and a numerical display section 160.

Furthermore, this CPU outputs a drive control signal to an image forming element such as an electrostatic charger, and also outputs a drive control signal to an image forming element such as a charger, and also outputs a drive control signal to a developing device drive motor 2.
4.24', solenoids 33, 33', etc., to control the image forming operation.

FIG. 12 shows the main routine of the CPU 70-
It is diyat. First, by turning on the power, etc. □, initial settings are performed (So). That is, each scale register, flag, etc. in the CPLI are set to the initial state.

Next, an internal timer that defines the time for one routine is started (Sl), and if copying is not in progress, the copy mode selection routine (s3), simultaneous two-color selection routine (S4), and other input routines ( Execute S5). If copying is in progress, jump to steps 83 to $5 above and proceed to the copy mode control routine (S6), simultaneous two-color switching routine (87), and other processing routines (
Execute S8). Thereafter, the process returns to 82 after the internal timer started in S2 ends (s9). still,
In this embodiment, the simultaneous two-color selection routine (S4) and the simultaneous two-color switching routine (s7) will be explained, and the explanation of other routines will be omitted.

Figures 13 and 14 are flowcharts showing details of the simultaneous two-color selection routine (S4). As shown in FIGS. 13 and 14, first, a switch 502 is installed on the top of the copying machine.
It is determined whether the output signal of is on (810).

When the output signal of the switch 502 is not on, that is, when the title plate is not placed on the original glass 44, the flag B@1 is set to "o" (S11). Incidentally, flag B is a flag indicating simultaneous two-color copying using a title board, and B-0 indicates cancellation of that mode, and B-1 indicates setting of that mode.

Next, on the edge of the simultaneous two-color copy mode designation switch 501, the simultaneous two-color copy mode display LED
20 is already lit (S12.5
13).

If this LEDI 20 is already on, it is turned off (814) and flag A is set to "OI+" (815).
). This flag A is a flag indicating the simultaneous two-color copy mode using the lever 35.6, and when A=1, the mode is set;
A-0 indicates mode release.

On the other hand, if this LEDl 20 is off, it is turned on (816) and the flag A is set to "°1" (816).
17). That is, at the same time using levers 35 and 36. - In the case of two-color copy mode, the setting of that mode is set using switch 50.
According to the input of 1.

Also, pressing the simultaneous two-color copy mode designation switch 501 once turns it on, and pressing it again turns it off.

On the other hand, when the output signal of the switch 502 is on, that is, when the title plate 400 is placed on the original glass 44, the flag A is set to O'' (818), and the simultaneous two-color copy mode display LED 120 is turned on. (819).

Next, if flag B is set to "00", flag B is set to "1°", and a simultaneous two-color copy mode using a title board is set (822). In step 820, if the flag B is "1", it is determined whether or not there is an on-edge of the variable magnification mode selection key 504 (823), and if there is an on-edge, it is determined whether or not the automatic reduction mode is selected. Determine (824)
. Note that the selection of the variable magnification mode using the key 504 is configured such that automatic reduction mode, automatic analog mode, and normal magnification are sequentially selected in rotation for each key manually.

When it is determined that the automatic reduction mode is selected, the LED 213 is lit and a predetermined reduction ratio is set (
826). Note that this reduction magnification is determined by the size 1 in the paper feeding direction (same as the longitudinal direction of the document glass 44) of the selected paper feed force sensor 1- and the document glass 4 of the title plate 400.
4 (see FIG. 11). Further, the numerical display section 16 on the operation panel 100
0"-2 reduction magnification is displayed (327). Then, the operating conditions for simultaneous two-color copying to be reduced (for example, aI of a timer tT, which will be described later, which defines the color development area) are set (828).

On the other hand, when the automatic reduction mode is not selected, it is necessary to determine whether the automatic analog mode is selected or not.
0), when the automatic Anamo mode is selected, the automatic Anamo mode display 1 and ED214 should be lit 531)
, and set the analog magnification ratio (S32). Note that this analog magnification is also determined from the above size statement and size b (see FIG. 11 (1)). In addition, the numerical display section 160
The analog magnification ratio is displayed, and the simultaneous two-color copy operation conditions for analog magnification are set (S33.534).

In addition, when the automatic reduction mode and automatic analog mode are not selected, that is, when the size is the same, the LED 213
．． 214 and sets the operating conditions for simultaneous two-color copying without scaling (S39.540).

On the other hand, if the variable magnification mode selection key 504 is not on, it is determined whether the title plate detection switch 502 is off (835).

When the title board detection switch 502 is off, the simultaneous two-color copy mode display LED 20 and automatic reduction display L
The ED 213 and the automatic analog mode display LED 214 are turned off, and the flag B is set to "°O" (836 to 838).

Further, when the title board detection switch 502 is in the on state, the process waits until the on state of the print switch is detected. 84 when print switch on edge is detected
0, and set the conditions for simultaneous two-color copying at the same size using a title board.

15 to 23 show the simultaneous two-color switching routine (S7).
) is a flowchart showing details of the process.

The process advances to each of the states (8101) to (8108) in accordance with the value of the binary state number determined in step 5100. By the way, is there a copy machine? 2 when i+71111 is set
The driver state number is set to rOJ.

In the two-color state number rOJ (8101), it is determined in steps (8200) to (8202) whether scanning by the scanning unit 112 is being executed in the simultaneous two-color copy mode, and in step 5203, the registration switch 500 ( (see Figure 1) is turned on.
i do Note that this registration switch 500 is for detecting that the scanning unit 112 is at a predetermined position.

When flag B=1 in 8204, that is, simultaneous two-color copy mode using a title board is set, 5205
~5207, the first developing device 4. Conditions for developing the image (with color toner) are set.

As a result, when the title plate 400 is used, the leading edge side of the scan is developed in color and copied. That is, when using the title board 400, simultaneous two-color copying is performed in which the color is switched from color to black. At 8208, a timer tT is set for a time corresponding to the length of the title plate in the longitudinal direction of the original glass 44 and the reduction magnification, and the dual color state number is also set to "1".

Flag B=O (S204>, that is, in the case of simultaneous two-color copy mode using the levers 35 and 36, simultaneous two-color copying of black → color → black is performed. Therefore, first, the second developing device 5, that is, the black developing The device operates for the first time (8300-8302)
.

Also, set the second power state number to "2".

In the case of two-color state number "1" (simultaneous two-color copying using a title board), after the time tr corresponding to the length of the title board and the reduction magnification has ended (8210>,
At 8211, timer t1 is set. This timer t1 determines that when the timer tT ends, the electrostatic latent image corresponding to the boundary from color to black is transferred from the position W on the photosensitive drum 1 shown in FIG. 3 to the first developing device 4. This is the time required to reach the development area X. At step 5212, the binary state number is set to 6 and the process returns.

2 color state number "2" (simultaneous two color copying switch 39 using levers 35 and 36 is on (S
220), a timer t+ is set at 8221. This is because 1+ causes a time-up in the dual color state number "3" and causes the first developer 4 to perform development.

Then, set ``3.1'' to the second power state number (8222) and return.

In dual color state number "3" (simultaneous two-color copying using levers 35 and 36), when the timer t1 times up in S230, the main pole N1 of the first developer 4 (containing color toner) is connected to the photoreceptor drum. 8231>
, the first developer motor 24 is turned on, and the sleeve roller 1 is turned on.
2 starts rotating (8232). Further, after the developing bias is set to the color level (S233), the timer t2 is set (8234). This t2 timer defines the time t2 required for the same latent image to pass between the development area X of the first developer and the development area X' of the second developer. 2
After setting the color state number to "4", return (8235).When the color state number is "4" (simultaneous two-color copying using levers 35 and 36), 82
After timer t2 set in 34 times up,
In order to retract the main pole N1 of the second developer 5 (containing black toner), the second developer solenoid 33' is turned on at 5241. Then, in 5242, the second developer motor 33' is turned off, and the development in the second developer 5 is completed. Also, set "5" to the second power state number and return <82
43).

For two-color state number "5" (simultaneous two-color copying using levers 35 and 36), the second V'Jl' point, i.e., lever 3 for switching from color to black.
When the reed switch 39 is turned on again by the magnet 38 of No. 6 (S250), the timer t2 is set (S250).
251), then sets "6" to the binary state number (8252).

This timer tz is the same as described above.

When the color state number is "6" (simultaneous two-color copying using levers 35 and 36), the timer t is set to 5260.
1, the first developer solenoid 33 is turned on at 8261 in order to evacuate the main pole N1 of the first developer 4 (color) (<8261).

After turning off the motor 24 of the first developing device (826
2> sets timer t2 (8253), and sets r7J to the binary error state number (8264). That is,
Until the rear end of the area developed in color reaches the area X' developed in the black developing device (second developing device 5) (time t
Regarding z), if both are not stopped, problems such as color mixing will occur.

In the case of dual color state number "7" (simultaneous two-color copying using a title board), after the timer t2 times up at 5270, the solenoid 33' of the second current fm15 is turned off at 5271 and the main iN1 is turned off. facing the photoreceptor 1, 5
At step 272, the second developer motor 24' is turned on to rotate the sleeve roller and start development. Also, 2 at 5273
Returns after setting the error state number to "0".

[Operations and Effects of the Invention] In the present invention, when the imprinting member is placed on the document table in the variable magnification mode, the reduction is determined by the size of the fed paper and the size of the imprinting member. An electrostatic latent image is formed according to a magnification command related to the image.

Then, this electrostatic latent image is placed on the imprinting member.

Therefore, according to the present invention, it is possible to easily create a copy image on copy paper, in which the color of the image imprinted by the imprint member is different from that of other parts, and there is no image loss.

In addition, compared to the case of making reduced multicolor copies using conventional copying machines capable of composite copying, there is no need to manually replace or switch the developing device, calculate the copy magnification, etc., and there is no need to replace the original. . Furthermore, the copying speed is fast because - exposure scans are sufficient.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional schematic diagram showing a copying machine according to this embodiment, FIG. 2 is a perspective view showing the upper part of the copying machine according to this embodiment, and FIGS. 3 and 4 are developing Explanatory diagram showing the configuration of the vessel, No. 5
, FIG. 6 is an explanatory diagram of the construction of the displacement means of the magnet row 513, FIGS. 7 and 10 are explanatory diagrams of the title plate 400, and FIG. 8 is an explanatory diagram of the size detection section of the paper stored in the paper feed cassette. FIG. 9 is a plan view of the copying machine without showing the operation panel 150. FIG. 11 is an explanatory diagram of the automatic reduction mode and automatic analog mode using a title board, and FIG. 12 is a flowchart 1 to 13 showing the main routine of C P tJ that constitutes the control means of the copying machine. Figure 14 is
Details of the simultaneous two-color selection routine r;'lL! Figures 15 to 23 of the 70 chart shown in Figure 1 are flowcharts showing evaluation of the Kainan two-color switching routine. 4...First developing device 5...Second developing device 39...
・Reed switch 400...Imprinted member (title plate) Patent applicant
Minolta Camera Co., Ltd. Representative Patent Attorney Hiroshi OkawaFigure 4Figure 5Figure 6Figure 10Figure 8Figure 9Figure 17Figure 18

Claims (3)

[Claims] (1) A light image projection means that exposes and scans the original image on the document table and projects a light image according to a magnification command, and forms an electrostatic latent image using the light image projected by the light image projection means. a photoreceptor, two or more developing devices for developing an electrostatic latent image with toner, and a paper feeding means for feeding paper onto which the developed toner image is transferred and fixed near the photoreceptor. an imprinting member placed on a specific area on the document table as necessary; a detection means for detecting whether the imprinting member is placed on the document table; and setting a variable magnification mode. a variable magnification mode designation switch for: under the variable magnification mode, issuing a magnification command regarding reduction determined by the paper size fed by the paper feeding means and the size of the imprinting member to the light image projection means; a magnification change command means, and when it is detected that the imprinting member is placed on the document table in the magnification change mode, the image forming unit corresponds to a specific area on the document table where the imprinting member is placed; Different developing devices are used to develop the electrostatic latent image formed by one exposure scan in the area on the photoconductor and the area on the photoconductor corresponding to the outside of the specific area where the imprint member is placed. A simultaneous multicolor copying machine, comprising: a developing device drive control means for driving and controlling the developing device. (2) The simultaneous multicolor copying machine according to claim 1, wherein the specific area and the outside of the specific area on the document table are divided by predetermined portions in the scanning direction of the image projecting means. (3) The magnification command regarding the reduction may be an anamorphic reduction magnification command that reduces the image only in the scanning direction of the optical image projection means, or a normal reduction magnification command that reduces the image uniformly in the scanning direction of the optical image projection means and a direction orthogonal thereto. A simultaneous multicolor copying machine according to claim 1, which is a reduction magnification command.