JPH023506B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copying machine that can variably set the copy area on a document placement surface on which a document is placed.

The document table of a conventional copying machine has a document placement surface on which the document is placed when copying, and it is generally composed of a rectangular flat surface or a cylindrical surface that covers the maximum document size, and a position where the document is placed ( It has a document standard that defines the document position (hereinafter referred to as the document position). The document reference is, for example, a reference that aligns the document at a certain position in each of the left-right direction (hereinafter referred to as the X direction) and the front-back direction (hereinafter referred to as the Y direction) of a rectangular document placement surface (either horizontal or vertical) The position of the document relative to the document placement surface is determined by aligning the edges, center line, etc. of the document (FIGS. 1 and 2).

Here, the original is usually assumed to be a sheet or book with a rectangular image surface corresponding to the size of the copy paper used for copying, but it may also be a three-dimensional object or a part of a large document (within the original size). It is a general term for objects to be copied, such as making copies) or simultaneous copying of small-sized documents.

Conventionally, the document reference position is determined to be a fixed position, and the portion of the document to be copied is positioned relative to this position. Further, as described above, the pair of document references in the X and Y directions determines one placement position, that is, the document position, and only one document can be placed when copying.

However, the document placement surface covers the maximum document size, so when copying a small document, for example
A4, A5,
When copying documents such as A6, it is possible to place multiple documents on the document placement surface at the same time. Also, if documents can be placed appropriately on the document placement surface and manuscript standards can be set for the portions to be copied, multiple portions of the document placed on the document placement surface to be copied can be copied without moving the document. be able to.

An example of this is when a bound document is opened, placed on a document placement surface, and each of the opened pages is copied separately.

In this way, it is possible to arbitrarily set multiple document standards and therefore multiple document positions in the XY directions of the document placement surface, and multiple documents can be placed on the document placement surface at the same time. Making it possible to copy the parts to be copied separately adds a very convenient function to conventional copying machines, and the present applicant has filed a patent application.

However, the portion of a manuscript such as a document to be copied does not necessarily match the size of the copying material being used at the time, and may have a small area. In this case, even if you place the original on the original placement surface and set a document reference to determine a certain document position, the image on the copy material will be based on the end surface in the X and Y directions of the copy material that corresponds to the document reference. However, the image is generally formed on the same size as the copying material, and redundant information other than the portion to be copied or the outside of the document (for example, the document cover) is copied.

Therefore, by specifying the position of the original and the portion to be copied in the form of a rectangle as shown in Figure 3a (hereinafter this rectangular area will be referred to as the copy area),
By erasing unnecessary information other than the copy area on the copy material, the document processing function of the copy machine can be further improved.

In FIG. 3a, the document table 51 has a document placement surface 52 which is usually made of a transparent plate, and a direction plate 54 for indicating the document position. It is now possible to place up to A3 size. Furthermore, reference indicators are used to set the document reference in the X and Y directions (56 is the X-index, 57 is the Y
- index) and an area index for setting a copy area (58 is referred to as an XR-index and 59 is referred to as a YR index) are configured to be movable on the indicator board 54. Therefore, when an original 53 (with diagonal lines at the four corners) such as a document is placed on the original placing surface 52 and its copying area 60 is set using the reference index and the area index, the rectangle ABCD becomes the copying area 60. In the illustrated example, if the portion of the original 53 to be copied is an amorphous diagonally shaded area containing the numbers 1, 2, 3, . . .
However, the image is copied in a manner that matches the edge of the copy material 61 corresponding to the document reference indicated by the chain line, and the image outside the copy area 60 is erased and is not copied onto the copy material 61.

That is, an object of the present invention is to provide an apparatus that specifies a portion of an original such as a document to be copied as a copying area, and copies only that area onto a copying material.

To achieve the above-mentioned objects, the present invention includes a document table having a document placement surface for placing a document, an image of the document on the document placement surface being optically scanned and projected onto an electrophotographic photoreceptor. an optical means for transferring the original image formed on the photoreceptor onto a copy material in a transfer station; a copy material feeding means for feeding the copy material to the transfer station; , a setting means for setting an upstream end in the scanning direction of the desired copy area on the document; an illumination means for illuminating a non-image area other than the area corresponding to the desired copy area on the photoreceptor; A first control unit for controlling the time point at which the copy material is fed by the copy material feeding device so that the distance between the position of the tip formed on the copy material and the tip of the copy material is constant based on the tip set by the setting device;
and a second control means for controlling illumination of the photoreceptor by the illumination means to illuminate the non-image area based on the tip set by the setting means. be.

Hereinafter, the present invention will be explained in detail with reference to Examples.
Although this embodiment is an electrophotographic copying apparatus having a mirror scanning system, the present invention is not limited to this embodiment, but can also be applied to full exposure systems such as a moving document table type and a flash exposure type. Ru.

FIG. 4 shows a sectional view of a copying machine suitable for implementing the present invention.

The original on the original placing surface 2 is illuminated by an illumination consisting of a reflective shade 3, a first mirror 4, and an illumination lamp 6, which are positioned directly below the original placing surface and are movable in parallel with the original supported by an appropriate rail. The system is scanned by a scanning system consisting of a second mirror 5 that moves in the same direction at half the speed of the second mirror 5, and a lens 7, a fixed mirror 8,
The image is formed on the photosensitive drum 1 via the photosensitive drum 9. On the other hand, the photosensitive drum 1 rotates in the direction of the arrow on a shaft 10 fixed to the main body, receives a primary charge by a charger 11, and then receives AC charge removal (or charge with a polarity opposite to the primary charge) by a charge remover 12. At the same time, the document image is exposed as described above, and the entire surface is further irradiated with the exposure lamp 14 to obtain a high contrast latent image.

The latent image is then visualized by a developing device 15, and then transferred to a copying material 17 fed from a cassette 16 by a transfer charger 18 in a transfer station, and after the copying material 17 is separated from the photosensitive drum 1. The powder image is heated and pressurized by the fixing device 20 to fix it on the transfer material and is discharged outside the machine.

On the other hand, after the photosensitive drum 1 has been transferred, the residual powder image on its surface is removed by a cleaning device 21, and the photosensitive drum 1 enters the next copying cycle.

Next, in order to facilitate understanding of the present invention, the relationship between the scanning system and paper feeding will be explained.

The copying machine of the present invention, as shown in FIG.
The pulse generating device 30 counts the number of pulses generated and performs various controls. In the movement path of the scanning system, there is a scanning system home position detector H1 and a scanning start detector H2, each of which includes, for example, a Hall position detector H1 and a scanning start detector H2.
An IC is used, and a magnet M1 is fixed on the scanning system side as an actuating piece of the detector. At the starting position shown in FIG. 4, the scanning system magnet M1 is stationary facing the home position detector H1.
In this state, when you press the print button, photosensitive drum 1
rotates, and at the same time the clock pulse generator 30 and pulse counter also operate. After counting the necessary number of pulses, a paper feed signal is issued, and the copy material 17 held in the cassette 16 is fed from the cassette 16 by the operation of the pick-up roll 19 and reaches the register roll 29 via the transport roller 22. Since the register roll 29 stops rotating just before the copy material fed from the cassette arrives, the fed copy material makes a slight loop and stops with its tip in contact with the register roll 29. do.

On the other hand, in the scanning system, the illumination lamp 6 is turned on after a predetermined number of pulses, and the forward clutch CL-1 is turned on to start forward movement and to start image exposure of the document on the document table.

Next, synchronize the image on the photoreceptor with the copy material (make the copy material at the copying position match the visible image on the photoreceptor)
, the aforementioned detector H2 is provided at the position (arrow 23) where the scanning system scans the leading edge of the document, and a signal is output when the scanning system passes this position. This signal corresponds exactly to the leading edge of the image on the photosensitive drum. Using this signal as a reference, clock pulses generated in synchronization with the drum rotation are counted, and the leading edge of the image on the photosensitive drum is moved to a position that leaves a distance on the photosensitive drum corresponding to the distance from the transfer position to the register roll 29. When this occurs, a register activation signal is issued, the copying material is fed again, and transfer is performed in synchronization with the developed image on the photosensitive drum.

On the other hand, it is desirable for the scanning system to control its scanning distance depending on the size of the original or the size of the copy material loaded. (after passing through) to switch from forward movement to backward movement.

After the backward movement, the scanning system activates the home position detector H1 and stops. In a copying machine having the above configuration, the apparatus of the present invention will be specifically described.
On the document table 51, a reference index and a region index are movably provided in the vicinity of the document placement surface on guide means fixed inside the document table. (Fig. 6) First, to explain the setting of manuscript standards,
Since the index 56 sets the reference of the copying area 60 in the X direction, the image position on the copying material 61 is such that the line A-B corresponds to the tip of the copying material 61. For this purpose, it is necessary to control the operation of the register roll of the scanning system by moving the X-index 56. The X-index 56 consists of a knob/index section 34 and a holding section 35, is movable on the rail 36, and is connected to the home position detector H.
1. It has an image leading edge detection element H2.

Assuming that the X-index 56 coincided with the reference point 55, which is the normal document position, in the previous copying operation, the scanning system is in the normal home position. In this copying operation, when the reference index is set at the position shown in Figure 3 and the copy operation is started, the necessary pre-processing process is started and the X-index is integrated with the X-index. Since the home position H1 is also moving, the scanning system is a double-acting clutch motor.
CL-2 is activated and moves slightly in the direction of arrow A as shown in FIG. 7, but its movement is restricted by limiter L-1 which is fixed at a position slightly shifted from the original home position. As a result, the forward clutch CL-1 operates and the scanning system moves forward, so the X-
When the home position detector H1 provided integrally with the index and the magnet provided integrally with the scanning system are activated, the home position detector H1 is temporarily stopped at this position as shown in FIG. 8 by a signal from the detector.

Thereafter, when the pre-processing step is completed, the scanning system forward clutch CL-1 is operated in response to a signal from the control device, and the illumination lamp is also turned on to start scanning the document. The scanning length is controlled by counting the number of pulses, which is uniquely set depending on the copying material size or cassette type, as described above. Also, for safety reasons, a limiter L-2 is provided at the right end where the maximum scanning length is completed, and this limiter turns off the forward clutch CL-1 of the scanning system and prevents the set copy material from moving backward, regardless of the cassette. The purpose is to operate the clutch motor CL-2. As described above, the copy material is fed from a predetermined cassette in response to a copy cycle or, if necessary, in advance of the copy cycle, reaches the register roll, and is stopped. After that, in order to operate the register roll with the number of clock pulses based on the document edge detection signal generated by the movement of the scanning system, the image edge and the copying material are precisely aligned, and the scanning length is determined by the number of copying materials or cassettes. Since it is controlled, the length in the scanning direction is uniquely determined by the copy material if only the leading edge of the document is specified. Also, if the distance from the set X-index position to the end of the document (actually the length to be copied) is shorter than the set copy material, the limiter L described above
The scanning is completed by activating the scanning system at -2, so although there is a blank space at the rear end of the copying material, there is no problem with copying.

Next, regarding the Y-direction, as shown in Figure 6,
- Similar to the index, the Y-index 57 is also a knob/index section 38
with a guide 37 installed near the tip of the document table.
The Y-index only moves the reference in a direction perpendicular to the scanning direction.
The copyable area on the side opposite to the reference is determined by the size of the copy material. In this case, if the reference is moved to position C, the image to be transferred on the photoreceptor will also remain shifted relative to the copying material, as shown in FIG. 10. In this case, since the feeding position (passage) of the copy material is fixed, the transferred image will be cut unless the image to be transferred is moved by an amount corresponding to D when the reference is moved relative to the prescribed copy material. . Therefore, Y-
When moving the index, the lens also needs to be moved a predetermined distance in the same direction. That is, as shown in FIG. 11, the lens is moved so that the image corresponding to the reference after movement is projected at the position corresponding to the reference before movement. All you have to do is move the two lenses in the same direction.

An example is shown in FIG. A rail 39 is oriented at one end of the optical system box in a direction perpendicular to the optical axis, a lens holder 40 is movably supported on the rail 39, and a pulley 41 is attached to a part of the lens holder.
The wires are rotatably supported on a shaft, each end of which is optically fixed, and after passing through the pulley, the Y-marker 57 is passed through a deflection pulley 43 fixed to the main body.
It is fixed at

As is clear from the figure, the pulley works as a movable pulley, so when the Y-marker 57 is moved, the lens 7 is moved integrally with the lens holder 40 by half of the movement.
move in the same direction.

Although a copying machine having a mirror scanning system with a fixed document table has been described as an embodiment, the present invention is not limited thereto.

In a copying apparatus of a movable document table type, the home position of the document table can be moved using an X-index, and in the case of a full exposure system such as a flash exposure type, the objective can be achieved by moving the lens.

Also, in any case, as for the Y-index, it is natural that the lens can be moved in the same way as in the embodiment.

Next, a method for erasing images outside the copy area will be described according to an embodiment.

2. Description of the Related Art Conventionally, in image forming apparatuses using electrophotography, a photoreceptor having a photoconductive layer is used as an image carrier. Such an image carrier is subjected to a voltage application process such as charging and static elimination using a corona discharger, and a light irradiation process such as optical information, to form an electrostatic latent image on its surface. The above-mentioned electrostatic latent image is later visualized using a developer. In the case of dry development, a powder developer with a particle size of 5 to 15 μm is used, while in the case of wet development, dispersed particles are developed in a carrier liquid. It is visualized by the agent. The visible image on the latent image carrier obtained in the above manner is transferred to a copying material such as plain paper, which is superimposed on the latent image carrier via the visible image, while applying voltage using a discharger, roller electrode, etc. do. The copying material on which the visible image has been obtained is then forcibly separated from the image carrier, heat is generated by a heating means such as a heat roller or a heater, and the visible image is fixed thereon.
In an apparatus using a latent image transfer system (TESI) electrophotographic method, after the latent image is formed, the latent image is transferred to a copying material capable of retaining charge, and then the chargeable member is transferred from the image carrier. There is a method that separates and develops and fixes it.

FIG. 12 shows that a control light is emitted by a mask member to illuminate a photoreceptor area other than the photoreceptor area on which the set original copy area is imaged, that is, a photoreceptor area corresponding to outside the set copy area to eliminate static. 5 is a partial view showing a mechanism for controlling the formation of an electrostatic latent image on a photoreceptor, and corresponds to the image exposure section in FIG. 4. FIG. In the figure, the light sources 62 for controlling the image area include point light sources sufficient to uniformly illuminate the entire width direction of the photoreceptor 1', or light sources sufficient to illuminate the entire width direction of the photoreceptor 1' in the axial direction. It is a line light source with a sufficient irradiation width. This light source 62 irradiates the image area with control light 63 for controlling the formation of the electrostatic latent image, and the light amount and irradiation area are regulated by the slit 68, and the electrostatic charge on the unnecessary latent image area on the photoreceptor 1' is reduced. to erase.

Reference numeral 66 denotes a mask member for controlling the control light 63 within a predetermined width, and is rotatably supported by a shaft 67, and is movable to positions 66' and 66'' indicated by two-dot chain lines in the figure.

FIG. 13 shows control means for the mask member 66. Control of rotational movement around a shaft 67 is performed by a pulse motor MX via gears 70, 71 fixed to the mask member 66 and a transmission system 72. Further, the width is controlled by moving the mask member 66-2 in the direction of the arrow with respect to the mask member 66-1, and this is performed by a pulse motor MY via a pulley 73 and a wire 74.

In addition, in FIG. 13, the opening of the mask member 66-2 is closed by a member not shown.

FIG. 15 shows a state in which the mask member blocks the light source 62 of the control light 63, and in the figure, the width W corresponds to the length of the copy area in the Y direction. The light source 62 now includes a plurality of lamps 62-0, 62-n (n
=1,...), 62-R.

The lamp 62-0 is configured so as not to affect the other lamp groups by the light-shielding plate 69-0, and is not controlled by the mask member 66, so it always provides an irradiation area of width W ₀ on the photoreceptor 1'. Form. Therefore, no latent image is always formed on the photoreceptor 1' in an area of width _W0 , which becomes a blank space. If the boundary line WLO between the width W and the width _W0 corresponds to the reference line 55X in FIG. do.

Further, if it is necessary to cut out a part of the edge of the original image 53', the edge of the original image 53' corresponding to the reference line 55X can be set in an area having a width _W0 . At this time, the portion of the image that extends beyond the width W ₀ of the original image 53' is cut out and becomes a margin.

The lamps 62-1 to 62-n constitute a light source controlled by the mask member 66, and the light shielding plate 69-n
As a result, the influence of lamp interaction is alleviated, and light is shielded by the mask member 66, thereby forming a copy area 60 having a width W. If the width W is now set at the position shown in Fig. 15, its boundary line
In order to clarify the WLO or WL, that is, to sharpen the edges of the image area, the distance b between the photoreceptor 1' and the tip of the mask member 66 or the light shielding plate 69-0, and the distance between them and the filament 62F of the lamp 62. The ratio of c may be set to b/c≦1.

Furthermore, regarding the boundary line WL, the lamp 62-8 in the vicinity is turned off and the mask member 66-2 is turned off instead.
It is necessary to compensate by lighting the lamp 62-R, which moves integrally with the lamp 62-R.

In the above embodiment, b≒c≒40 to 50 mm was sufficient. Furthermore, the position of the lamp 60-0 is changed to the light shielding plate 69-.
By arranging it as close as possible to 0, it is possible to obtain a sharp boundary. In order to obtain a sharp boundary, it is preferable to use a lamp with a point light source, but in the case of a linear or patterned light source (filament, etc.), the lamp 6 as shown in Fig. 15 is used.
It is effective to arrange the filament 62F of 2-0 or 62-R so that it is perpendicular to the surface of the photoreceptor 1'. Alternatively, the light may be irradiated onto the photoreceptor 1' using a lens.

In the above embodiments, an apparatus to which the electrophotographic method described in Japanese Patent Publication No. 42-23910 is applied was cited as an example, but other apparatuses such as the Carlson method that form a latent image by a charging process and an image irradiation process can also be used. The present invention can be achieved by providing an illumination means separate from the image illumination after or at the same time as the process. Of course, depending on the characteristics of the photoreceptor, it is possible to carry out the light irradiation according to the present invention even before the charging step.

FIG. 3b shows an image area 53' (hereinafter referred to as the original image) corresponding to the original. In the figure, a rectangle ABCD including an amorphous shaded area (portion to be copied) represents a copying area 60, other parts indicate unnecessary image areas, and 61 indicates the position of copying material. The original image 53' advances in the direction of the arrow and is sequentially scanned with the slit exposure width. In the figure, the distance between A and B (between D and C) corresponds to the width of the copy area 60, and the distance between A and D (between B and C) corresponds to the length.

FIG. 14 is a diagram showing an example of the operation of the mask member 66 to obtain the copy area 60 from the original image 53' of FIG. 3b. The left side of each of Figures 1 to 4 is a cross section (V-V' cross section) within the copy area.
The right figure is a diagram illustrating how the mask member 66 controls the irradiation area of the control light of the image area with respect to the exposure light of the original image on the photoreceptor 1'. In the left side diagram of FIG. 14, the solid line and dotted line along the drum-shaped photoreceptor 1' are the image I to be formed from the assumed original image as shown in FIG. 3b on the surface of the photoreceptor 1'. It moves on the photoreceptor 1' in synchronization with the rotation of the photoreceptor 1' in the direction of the arrow. In image I, the solid line portion corresponds to the copy area (area 60 in FIG. 3b), and the dotted line portion corresponds to the unnecessary image area. Further, in the figure on the right, an area 65 surrounded by a dotted line indicates an irradiation area of the control light 63 in the image area with respect to the exposure light 64 of the original image.

As shown in FIG. 14, until the document image is scanned and the position of the leading end A-B of the copy area in image I reaches the light irradiation area 65, the mask member 66 is not used to control the control light 63 in the image area. completely out of the optical path. As a result, the light irradiation area 65 on the photoreceptor 1' receives the control light 63 over the entire surface, and the electric charges in the area are erased. Therefore, the electrostatic latent image in the area from the tip of image I to position A-B is completely erased, and when trying to obtain a copy as shown in Figure 3b, the portion corresponding to the above area is erased. The image will appear white and no image will be formed. Next, when the position A-B shown in Image I progresses and reaches the light irradiation area 65, the lower end of the mask member synchronizes with the progress of the position A-B, as shown in FIG. and start descending in the direction of the arrow. Subsequently, the mask member 66 descends until it completely blocks the control light 63, and then stops. This state is shown by the mask member 66' in FIG.
is maintained until it reaches. Therefore, the light irradiation area 65
The control light 63 is prevented from irradiating the area corresponding to the mask member 66, and the electrostatic latent image in the area remains without being erased. On the other hand, irradiation area 6
The control light 63 is irradiated onto a region of 5 corresponding to the portion not shielded by the mask member 66, and the electrostatic latent image in the region is erased. Therefore, when attempting to obtain a copy as shown in FIG. 3b, an image will be formed only in the copy area 60.

Further, when the position C-D shown in image I advances and reaches the light irradiation area 65, the upper end of the mask member 66 moves to the position C-D as shown in FIG. 14.
It starts to descend in the direction of the arrow in synchronization with the progress of the control light 63, and finally descends to a position where it is completely out of the optical path of the control light 63, and then stops. The above position is maintained until the image I completely passes through the light irradiation area 65, that is, until the scanning of the original image is completely completed. Therefore, the electrostatic latent image in the area from position C-D to the rear end of image I is erased, and the area of the copy corresponding to the above-mentioned area has the same image as the area from the leading edge to position A-B. No image is formed at all.

When scanning of the original image is completed, the mask member 66 rises in the direction of the arrow in FIG. 14 and returns to the original position shown in FIG. 14.

The above is an example showing the operation of the mask member 66 for obtaining a necessary image in the present invention. As a result, it is possible to accurately and easily obtain an image of the copy area 60 excluding the peripheral portion of the original image 53 shown in FIG. 3B.

In addition, even if the mask member 66 does not descend in complete synchronization with the advancing speed of the electrostatic latent image projected on the photoreceptor, for example, even if the mask member 66 is lowered faster, the control light can be adjusted accordingly. Of course, it would be better if 63 was irradiated more strongly.

The copy area has X-index 56 and XR in the X direction.
Since it is defined by the index 58, it is possible to realize the above-described operation of the mask member 66 by operating the control means of the mask member 66 in conjunction with the operation of the scanning system.

That is, in a copying cycle, the scanning system starts from the home position set by the X-index 56, and when scanning of the copying area 60 begins, a scanning start position detector H2 outputs a scanning start signal. As a result, the mask member 66 is rotated by a certain angle by a driving means such as a pulse motor MX and then stopped. This is the process from when the position A-B shown in image I in FIG. 14 advances and reaches the light irradiation area 65 to the position of the mask member 66' in FIG. handle.

Next, when the scanning system reaches the detector H3 of the XR-index 58, it issues a signal indicating the end of scanning of the copy area 60. As a result, the mask member 66 is again rotated by a certain angle and stopped, and when the entire image area corresponding to the copy material size has been scanned, the microphone member 66 is returned to its original position. This is the C-
From the time when the position D reaches the light irradiation area 65, the first
4 This corresponds to the process in which the mask member 66 returns to its original position in FIG.

Next, since the Y direction is defined by the Y-index 57 and the YR-index 59, the image position on the photoreceptor is controlled in conjunction with the Y-index 57, and the area is controlled by the YR-index. Just control it.

That is, as shown in FIG. 6, the length of the copy area in the Y direction corresponds to the interval between the Y-index 57 and the YR-index 59. Therefore, Y-index 57 and YR-index 5
9 position signal using a potentiometer, for example.
PMY and PMYR detect the voltage drop value or resistance value from the reference point 55, and the AD converter ADY converts it into a digital signal and subtracts it. This digital signal is sent to the motor control circuit MCY to operate the pulse motor MY. As a result, the pulse motor MY moves the mask member 66-2 in the direction of the arrow to a predetermined position, and moves the mask member 66-2 so as to define the range of the control light corresponding to the YR-index 59.
Determine the width of 6.

In the above description of the present invention, an apparatus has been described in which a copying area is defined using a reference index and an area index, and the end portion of the copying material corresponding to the document reference is aligned with the document reference on the document placement surface to make a copy.

However, the present invention is not limited to this technique, and the document reference is fixed to the reference lines 55X and 55Y in FIG. It is also possible to realize a device that specifies a copy area by using the copy area. That is, the third
56 and 57 in Figure a also serve as area indicators.

In this case, the position of the original image on the copy material is constant, and it is necessary to erase the image between the reference line 55X and the copy area by adjusting the Y-index 57. Therefore, in FIGS. 13 and 15, the mask member 6
6-1 must be movable like the mask member 66-2, and a lamp corresponding to the lamp 62-R must be provided.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams showing conventional document standards, FIGS. 3a and 3b are plan views showing the document placement section in the present invention, and FIG. 4 is a sectional view of a copying machine suitable for the present invention. , Fig. 5 is a perspective view showing the driving relationship between the scanning system and paper feed, Fig. 6 is a perspective view showing the reference index and area indicator, and Figs. 7 and 8 show the relationship between the scanning system and the detector. FIG. 9 is a perspective view showing the interlocking relationship between the index and the lens, FIGS. 10 and 11 are explanatory views showing the relationship between the original image and the transferred image, and FIG.
13 is a sectional view showing a mechanism for controlling the formation of an electrostatic latent image on a photoreceptor of the present invention, FIG. 13 is a perspective view showing a control means for a mask member, and FIGS. 14 to 4 are operating states of the mask member. FIG. 15 is a cross-sectional view showing the control means in a light-shielding state. 51 is a document table, 52 is a document placement surface, 53 is a document, 56, 57, 58, 59 are indicators, 60 is a copy area, 61 is a copy material, H ₁ , H ₂ , H ₃ are detectors, 7
62 is a light source, 63 is control light for the image area, 65 is an irradiation area, and 66 is a mask member.

Claims (1)

[Scope of Claims] 1. An original table having an original placing surface for placing an original, an optical means for optically scanning an image of the original on the original placing surface and projecting the image onto an electrophotographic photoreceptor. , a transfer unit for transferring the original image formed on the photoreceptor onto a copying material in a transfer station; a copying material feeding unit for feeding the copying material to the transfer station; a setting means for setting the leading end of the desired copy area on the upstream side in the scanning direction; an illumination means for illuminating a non-image area other than the area corresponding to the desired copy area on the photoreceptor; a first control means for controlling the time point at which the copy material is fed by the copy material feeding means so that the distance between the position of the tip formed on the copy material and the tip of the copy material is constant based on the set tip; A copying machine capable of setting a copy area, comprising: second control means for controlling illumination of the photoreceptor by the illumination means to illuminate the non-image area based on the tip portion set by the setting means.