JPH02132474A - Copying device - Google Patents

Abstract

PURPOSE:To prevent a shadow on a copy caused by floating of a corner part of a document in which the corner part is stapled with a staple by providing a means for designating at least one corner part of the document to be copied and a means for obstructing an image formation of its corner part. CONSTITUTION:When a CPU receives a corner erasion mode by a corner erasing key 85, four corner part positions and a size to be erased are displayed by length of a side on a dot matrix indicator 88. An operator designates them and stores them in an NRAM by a memory key 67 and they can be used as the subsequent standard value. Also, the CPU generates flickering data of an eraser 24, based on data of a selected transfer paper size and a document size and stores it in a RAM. When the operator sets a document and depresses a print key 43, and a copy is started, corner erasing data is read out in accordance with a progress and the data and a control signal are sent to the erasor 24, and the corner erasion can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a copying apparatus, and more particularly to a copying apparatus suitable for copying a plurality of stacked original documents with the corners stapled together.

[Prior art and problem to be solved by the invention] The corners of multiple stacked originals are stapled, and the pages of these originals are sequentially attached to a contact glass (original platen) while turning the pages.
I often copy it by setting it on top. At this time,
The corner of the bound part of the manuscript is bent, leaving a triangular missing part.

Furthermore, the original pressure plate is lifted due to overlapping of the originals, and a shadow of that area is created on the transfer paper.

To prevent this from happening, it is necessary to remove the staples and copy the originals separately, and then staple the originals again after copying is completed, which is very time-consuming and complicated.

Regardless of the form of the original bound using such a stable, the boundary between the edge of the original and the original pressure plate may be copied as a shadow, or when copying is performed with the original pressure plate open, the image may fall on the photoreceptor of the original. If there is a misalignment between the projection position of the image and the position of the transfer paper, or if the original size is smaller than the transfer paper size, black streaks may appear around the edges of the copy. To prevent this, conventional models have a frame erase mode that prevents images from forming around the original or transfer paper, or models that always erase the frame, not in a specific mode, regardless of the operator's selection. Are known.

However, since this frame erasing mode is originally intended to copy all the information in the original and prevent shadows and black lines around the edges, it is desirable that the width of the frame be as narrow as possible within the range that achieves the purpose. Therefore, it is usually set to about 2 to 5+ nm. When copying a document with stapled corners and turning the pages, the length of each side is usually 3.
Since the range of the right triangle inside and outside 0 mm is folded back, the shadow of the folded part will appear on the transfer paper with this frame erasing width.

Furthermore, if the width of the frame eraser is widened so that the shadow of the folded part is not captured, there is a possibility that the image of the document will be missing. Therefore, it is not appropriate to use this frame erasing mode as a substitute for corner erasing.

Furthermore, apart from this frame erasing mode, trimming and masking, which designate and erase portions of an image on a document that do not need to be copied, have also been known.

In this case, a coordinate input means for inputting coordinates to specify the area to be erased is required, such as using a digitizer to specify the coordinate area with a stylus pen, or using numerical keys on a copying machine to input the number of copies. In a mode that accepts position data, methods such as using it as a coordinate position input key are used.

However, in order to avoid the processing speed of coordinate data by the digitizer, the trouble of inputting data using numerical keys, and the increase in the number of coordinate data to be processed, the area where the image is erased is parallel to the direction in which the original is scanned when copying. The practical upper limit is a polygonal region with a side and an orthogonal side. Therefore, this function is not suitable for erasing corners.

In addition, due to differences in the size of the original or transfer paper, or differences in the way the original is placed on the contact glass, it is necessary to respecify the area each time the area where the corners should be erased changes.
There is a problem that the operation becomes complicated.

The present invention has been made based on the above-mentioned background, and when copying a plurality of stacked originals with the corner portions stapled and set on a contact glass one by one while turning the pages, the binding of the original is fixed. This prevents the corners of the parts from being bent, resulting in triangular missing parts, which prevents images that are not originally on the original from being formed on the transfer paper, and also prevents the original pressure plate from lifting up due to overlapping originals, which may cause defects on the transfer paper. It is an object of the present invention to provide a copying apparatus which can effectively prevent the formation of shadows and dirt on the corners and has excellent operability.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention is characterized by having a configuration as described below. That is, (1) the present invention is characterized in that it includes an image formation preventing means, such as an eraser, which prevents image formation on at least one corner of a document to be copied (transfer paper);

(2) Corner specifying means for specifying at least one corner of the document to be copied (transfer paper), for example, consisting of a dot matrix display and a numeric keypad, and image formation at the corner specified by the corner specifying means. The image forming apparatus is characterized in that it includes an image formation preventing means such as an eraser.

(3) Corner specifying means for specifying at least one corner of the original (transfer paper) to be copied, such as a dot matrix display and a numeric keypad; and preventing image formation at the corner specified by the corner specifying means. and an image formation preventing means such as an eraser, and the corner specifying means is configured to be able to display a reference position such as a document abutting position and a corner position of the document using symbols such as numerical values or alphabets. It is characterized by the fact that

(4) Specify at least one corner of the original (transfer paper) to be copied. For example, use a corner specifying means consisting of a dot matrix display and a numeric keypad, and specify the size of the corner specified by the corner specifying means. The present invention is characterized by comprising a size specifying means consisting of, for example, a corner size key and a numeric keypad, and an image formation preventing means, such as an eraser, for preventing image formation in the area specified by the size specifying means.

(5) Corner specifying means comprising, for example, a dot matrix display and a numeric keypad, for specifying at least one set of two diagonally opposing corners of the original (transfer paper) to be copied; The present invention is characterized by comprising an image formation preventing means, such as an eraser, for preventing image formation on at least one set of corners specified by the section specifying means.

(6) Corner specifying means for specifying at least one of two sets of opposing corners of a document to be copied (transfer paper), such as a dot matrix display and a numeric keypad; image formation prevention means, such as an eraser, which prevents image formation at the corner designated by the corner designation means, and the corner designation means is configured to set a reference position such as an abutment position of the original and a corner of the original. This feature is characterized in that the positions of the sets can be displayed using symbols such as numerical values or alphabets.

(7) A corner erasing mode selection means such as a corner erasing key for selecting a corner erasing mode that prevents image formation on at least one corner of a document to be copied (transfer paper), and a corner erasing mode selection means such as a corner erasing key, etc. A storage means such as a ROM or RAM for storing corner erasing data, and an image formation preventing means such as an eraser for preventing image formation at the corner based on a command from the corner erasing mode selection means. , characterized in that it is configured to prevent image formation at a designated corner based on corner erasing data stored in advance in the storage means in response to a command from the corner erasing mode selection means. It is something.

(8) Corner erasing mode selection means, such as a corner erasing key, for selecting a mode that prevents image formation on at least one corner of the original (transfer paper) to be copied; and corner erasing mode selection means, such as a corner erasing key, for example, and corner erasing mode selection means, such as the size of the corner erasing area. For example, ROM to store data
Alternatively, a storage means such as a RAM, a corner erasing data changing means that can change the corner erasing data stored in the memory means, such as a corner size key and a numeric keypad, and a corner erasing data changing means that can change the corner erasing data stored in the memory means; The present invention is characterized by comprising an image formation preventing means, such as an eraser, which prevents image formation at the corner based on corner erasing data stored in the means.

(9) Corner erasing mode selection means, such as a corner erasing key, for selecting a mode that prevents image formation on at least one corner of the original (transfer paper) to be copied; For example, ROM to store data
Alternatively, a storage means such as a RAM, an image formation prevention means such as an eraser that prevents image formation at the corner according to a command from the corner erasing mode selection means, and corner erasing data stored in the memory means are read out. a temporary storage means, such as a RAM, for temporarily storing the corner eraser data; and a data changing means, for example, consisting of a corner size key and a numeric keypad, for changing the corner eraser data stored in the temporary storage means; It is characterized in that it is configured to prevent the image forming means from forming an image at the corner based on the corner erasing data changed by the corner erasing data changing means in response to a command from the mode selecting means. It is something.

(10) Corner erasing mode selection means such as a corner erasing key for selecting a corner erasing mode that prevents image formation at all four corners of the original (transfer paper) to be copied, and the size of the corner erasing area, etc. A storage means such as ROM or RAM for storing corner erasing data, and image formation of all four corners are inhibited based on the stored corner erasing data according to a command from the corner erasing mode selection means. The invention is characterized in that it includes an image formation preventing means such as an eraser.

(11) A corner erasing mode selection means, such as a corner erasing key, for selecting a mode for preventing image formation on at least one corner of a document to be copied (transfer paper); A size change specifying means consisting of a corner size key and a numeric keypad, for example, which can specify a change, and an eraser, etc., which prevents image formation at the corner based on the corner erasing data specified by the size change specifying means. The image forming apparatus is characterized by comprising an image formation preventing means.

(12) A corner erasing mode selection means, such as a corner erasing key, for selecting a mode that prevents image formation on at least one corner of the original (transfer paper) to be copied, and specifying a change in the size of the image forming area. A size change specifying means consisting of, for example, a corner size key and a numeric keypad, and a corner eraser data specified by the size change specifying means based on a command from the corner eraser mode selecting means, form an image of the corner. and an image formation prevention means such as an eraser, and the shape of the area for preventing image formation is determined by the original (transfer paper).
The object is a triangle with two sides parallel to the sides of the triangle, and the items to be changed by the size change designation means are the lengths of each of the two orthogonal sides of the triangle.

(13) A corner for abutment that is commonly used for each document, a document detection means for detecting the presence or absence of a corner of the document abutted against the corner for abutment, and a corner for abutment for the document that is abutted against the corner for abutment. An image formation preventing means for preventing image formation on the corner of the abutted document, and a control means for activating the image formation preventing means when the document detecting means confirms that there is no document at the abutting corner. It is characterized by the fact that

(14) An abutment corner commonly used for all originals, a rotatable document pressure plate that presses the document abutted against the abutment corner onto the contact glass, and an opening of the document pressure plate. a pressure plate rotation detection means for detecting the degree and direction of movement; a document detection means for detecting the presence or absence of a document portion abutted against the abutment corner; and a document corner abutted against the abutment corner. The document pressure plate rotation detecting device detects that the document pressure plate is closed below a predetermined angle, and the document detecting device detects that the document is placed at the abutting corner. and a control means for confirming that the image formation prevention means is not present and then activating the image formation prevention means.

[Example] Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing the appearance of a copying apparatus according to an embodiment of the present invention, and FIG. 2 is a schematic configuration diagram of this copying apparatus. First, the configuration of the copying apparatus will be explained with reference to FIGS. 1 and 2.

Reference numeral 1 denotes a contact glass on which a document is placed, and the document is pressed by a document pressure plate 2 and brought into close contact with the contact glass 1 . As shown in FIG. 2, below the contact glass 1, there is an optical scanning system consisting of an exposure lamp 3, a first mirror 4, a second mirror 5, a third mirror 6, a lens 7, a fourth mirror 8, etc. It has. An image formed by reflected light from the original is formed on the surface (photosensitive surface) of the photosensitive drum 9 via this optical scanning system.

In this embodiment, the document is fixed, and this optical scanning system is mechanically moved in synchronization with the rotation of the photosensitive drum 9 to scan the document. In document scanning, a first carriage (not shown) that mounts the exposure lamp 3 and the first mirror 4 and a second carriage (also not shown) that mounts the second mirror 5 and third mirror 6 are driven at a speed ratio of 2=1. Thus, the optical path length between the document surface and the photosensitive surface of the photosensitive drum 9 is kept constant.

Further, the position of the lens 7 is precisely controlled along the optical axis direction by a variable magnification motor (not shown). The paper feed system has two stages. That is, when the paper feed cassette 11 is selected,
The transfer paper is fed out by driving the paper feed roller 13 and the feed roller 14.

Or, if the paper feed cassette 12 is selected, the paper feed roller 15
The transfer paper is fed out by driving the feed roller 16. The fed-out transfer paper passes between registration rollers 17 and is guided to photosensitive drum 9.

A cleaning unit 22 is installed around the photoreceptor drum 9.
, electrification charger 23, eraser 24, developing device 10, transfer charger 19, separation charger 20, and separation claw 1
8 etc. are arranged at predetermined positions.

The eraser 24 extends in the axial direction of the photoconductor 9 (perpendicular to the plane of the paper), has an opening on the surface facing the photoconductor 9, and has a large number of light emitting diodes arranged inside.
The blinking of each light emitting diode is controlled by the control of a CPU 90 (see FIG. 4), which will be described later. The eraser 24 erases unnecessary charges on the photoreceptor 9, as will be described later, to prevent unnecessary images from being formed on the transfer paper.

A fixing device 2 is installed downstream of the photosensitive drum 9 in the transfer paper flow direction.
1, a conveyance path controller, a paper ejection roller, etc. 191 are provided. The conveyance path controller includes a control roller 25
, 26 and a switching claw 31.
It has a function of switching the conveyance path of the transfer paper after leaving the paper to the front discharge conveyance path, the upper reverse conveyance path, or the lower paper refeed conveyance path.

The copying apparatus shown in Figures 1 and 2 is a normal electrophotographic copying apparatus with editing functions and information addition functions added, and each part of the apparatus is sequence-controlled by a control section. ing.

FIG. 3 is a block diagram showing an outline of the electric circuit of this copying apparatus.

This copying machine uses a microprocessor (CPU) for control.
)90 is used. The bus line of CPU90 has CPU9
System controller 91, CP that controls input/output of 0
An eraser 24, a program memory (ROM) 93, and a read/write memory (RAM) 94 that erase unnecessary charges on the photosensitive drum 9 according to data and commands from the U90.
, a nonvolatile memory (NRAM) 95 backed up by a battery 100 and a backup circuit 96, an I/○ interface 97, 98, a clock unit 92 operated by a dedicated battery, and the like are connected.

A group of sensors such as a separated jam sensor, a sensor & switch unit, a jam indicator, an operation board 42, an editor 40 for inputting an area to be edited, a vector to be moved, a predetermined editing mode, etc. are connected to the engineering/○ interface 97. has been done.

The I/O interface 98 includes a driver unit that controls the position of the lens 7 by rotating the variable magnification motor, a lamp regulator that adjusts the voltage applied to the exposure lamp 3, and a fixing heater control that controls the temperature of the fixing device 21. a high-voltage power supply that supplies high voltage to each charger, a drum heater controller that controls the temperature of the photoreceptor drum 9, a servo motor that servo-controls the rotation angle of the photoreceptor drum 9, the document scanning speed of the optical scanning system, etc. A controller, a clutch/solenoid driver that controls energization/deenergization of each clutch and solenoid, a power supply unit 99 that supplies constant voltage to each component of the device, and the like are connected.

The CPU 90 sets conditions for executing image processing based on an operator's operation input on the operation board 42 . FIG. 4 shows the appearance of the operation board 42. The functions of each key will be explained with reference to this figure.

43: The print key is a transparent type switch, and the edge lamp on the back side lights up (rayday set) to indicate that copying is possible, and the red lamp lights up to indicate that copying is not possible (layday reset). At the time of lay-day setting, a copy start instruction is received.

44: Ten key Receives an instruction to set the number of copies, or in the inner erase and outer erase modes, an instruction to specify the erase area. Normally, the number of copies is set to one, but when making two or more copies of the same original (repeat processing), the operator operates this numeric keypad 44 to instruct the number of copies up to 99. can do. The CPU 90 displays the number of copies set according to this instruction on the display 46, and displays the number of copies made during the repeat process on the display 47.

In the inner erase and outer erase modes, the operator inputs coordinate data that specifies the erase area. The coordinate data is obtained by providing a transparent sheet with vertical and horizontal scale lines and a guide display indicating the position where the original is to be placed, setting the original on the transparent sheet, and reading the coordinates of the position to be erased.

The CPU 90 stores the input coordinate data and sets an erasure area. In addition, each coordinate is expressed as a 3-digit number, and C
The PU 90 displays the input values on the displays 46 and 47.

45: Clear stop key Receiving an instruction to correct the number of copies set according to the operation of the numeric keypad 44, the erase area, or the area input by the editor 40. Further, during the repeat processing, an instruction to cancel the repeat processing is received.

48: Interrupt key Receives an interrupt instruction. The CPU 90 stores the already set copy conditions in the RAM 94 in response to the operation of this key, interrupts another copy condition (interrupt processing) in response to the operator's operation, and lights up the interrupt display lamp 49. . If an interrupt instruction is received while setting interrupt processing, the copy condition is restored to the previous copy condition stored in the RAM 94 and the interrupt indicator lamp 49 is turned off.

5o: Paper feed selection key Receives a paper feed system switching display for selecting the upper paper feed cassette 11 or the lower paper feed cassette 12. The CPU 90 cancels the currently set paper feed system and sets the other one in response to the operator's paper feed system switching instruction. When the upper paper feed system is set, the size is displayed on the transfer paper size display 53 of the upper paper feed cassette 11 and the upper paper feed lamp 54 is turned on. When the lower paper feed system is set, the transfer paper size of the lower paper feed cassette 12 is displayed on the size display 51 and the lower paper feed lamp 52 is turned on. The transfer paper size is read from a barcode provided on the paper feed cassette. Further, when the paper feed cassette of the paper feed system being set is out of transfer paper, the paper out indicator 74 is turned on.

55: Magnification key When enlarging or reducing a copy of an original, an instruction to update the magnification is received. The CPU 90 sequentially shifts and sets the fixed variable magnification set in the ROM 93 in response to the operation of the magnification key, and displays the variable magnification on the magnification display 56. Further, since this variable magnification changes the size of an electrostatic latent image when scanning an original by an optical scanning system, the document scanning speed is set by multiplying the reciprocal of the set variable magnification.

63: Duplex 1 key Receives a double-sided original copy instruction to automatically create a double-sided copy from a double-sided original. When double-sided original copying is set, the CPU 90 receives a copy start instruction, copies the first side (front side) of the original onto the first side (front side) of the transfer paper, and after fixing it with the fixing device 21, first, Switch the conveyance path controller to the reversing conveyance path side, and turn the feed roller 30 (see Figure 2).
The transfer paper is sent to the reversing conveyance path. Next, the conveyance path controller is switched to the paper refeed conveyance path side, the feed roller 30 is reversed, and the transfer paper is guided to the paper refeed tray 34 by the feed roller 32 and the conveyance belt 33.

On the other hand, after scanning the first side (front side) of the original, the original is turned upside down by the automatic document feeder (ADF) which also serves as a pressure plate, and placed with the second side (back side) facing down. is fed to a predetermined position, and a copy start instruction is given to the CPU 90.

When the CPU 90 receives a copy start instruction, the CPU 90 starts the paper feed roller 3.
5 and the feed roller 36, the transfer paper whose first side (front surface) has already been copied is transferred to the registration roller 1.
7 and start making a copy of the second side (back side). When copying of the second side (back side) is completed, the conveyance path controller is switched to the front paper ejection conveyance path side, and the paper is ejected to an external tray (not shown). The duplex lamp 64 is turned on while double-sided original copying is being set. If you do not have an ADF or
When DF is used solely for the function of a pressure plate,
The transition from copying the first side (front side) to copying the second side (back side) does not occur automatically, but when the operator turns over the document, places it on the contact glass 1, and presses the print key 43.

61: Double-sided 2 key Receives a double-sided copy instruction to automatically create a double-sided copy from a single-sided original. When double-sided copying is set, the CPU 90 receives a copy start instruction, copies the original image of the single-sided original onto the first side (front side) of the transfer paper, fixes it in the fixing device 21, and then performs the same process as described above. Re-feed tray 34
lead to.

After that, if an ADF is installed, the ADF ejects the first original, feeds the next original to a predetermined position on the contact glass 1, and sends the CPU 90 to copy it onto the second side (back side) of the transfer paper. Instruct to start.

Upon receiving a start instruction, the transfer sheet on which the first side (front side) has been copied is fed out from the paper refeeding tray 34, and the original image of the next single-sided original is copied onto the second side (back side).

If the ADF is not equipped, or if the ADF is used only as a pressure plate, the copying of the first side (front side) will not automatically proceed to the copying of the second side (back side), and the operator will have to copy the next document. Transfer is performed by placing it on the contact glass 1 and pressing the print key 43. During double-sided copy setting, the double-sided 2 lamp 62 is turned on.

59: Synthetic key Receive synthesis instructions to perform synthesis functions.

When the CPU 90 sets composition according to the operation of this key 59, the CPU 90 switches the conveyance controller directly to the paper feed conveyance path side, and
The transfer paper that has come out of the fixing device 21 is transferred to the re-feed tray 3 without being reversed.
Lead to 4. Upon receiving the next copy start instruction, the transfer paper is fed out from the paper re-feeding tray 34, and the original image of the next original is superimposed on the side of the transfer paper that has already been copied.

When instructing synthesis, the synthesis lamp 60 is turned on.

57: Reverse paper discharge key Receives a reverse paper discharge instruction to reverse and discharge the copied transfer paper. When the CPU 90 sets reverse paper discharge in response to the operation of the reverse paper discharge key 57, the CPU 90 controls the conveyance path controller to reverse the transfer paper that has come out of the fixing device 21 and discharges the paper with the copied side facing down. do.

In this case, the conveyance controller is first switched to the reverse conveyance path side to feed the transfer paper to the reverse conveyance path, then switched to the discharge conveyance path, the feed roller 30 is reversed, and the paper is discharged by the feed rollers 28 and 29. .

This happens when you make double-sided copies of an odd number of single-sided originals, and if you make the last copy with a normal single-sided copy,
This is inconvenient because the directions of the copies are not aligned. In such a case, the operator instructs reverse paper ejection. During the reverse paper discharge setting, the reverse paper discharge lamp 58 is turned on.

66: Inner erase key Receives an instruction to set a mode for erasing the inner part of the specified area. When this key 66 is operated during the standard setting mode, the CPU 90 cancels the standard mode, sets the inner erase mode, and turns on the inner erase lamp 70. Further, when this key 66 is operated while the inner erase mode is set, the inner erase mode is canceled, the standard mode is set, and the inner erase lamp 70 is turned off.

65: Receive an instruction to set a mode for erasing the outer portion of the outer erase key designated area. When this key 65 is operated during the standard mode setting, the CPU 90 cancels the standard mode, sets the outside erase mode, and turns on the outside erase lamp 69. Further, when this key 65 is operated while the outside erase mode is set, the outside erase mode is canceled, the standard mode is set, and the outside erase lamp 69 is turned off.

67: Memory key, 68: Call key Receives a storage instruction to store a copy condition in the NRAM 95 and an instruction to call the copy condition stored in the NRAM 95. N.R.
The number corresponding to the copy condition storage area of AM95 is displayed on the dot matrix display 88.

77: Receive an instruction to divide the copyable area on the transfer key contact glass 1 into two areas in the scanning direction and copy them continuously. The modes instructed by the transfer key 77 include a mode in which two areas are copied onto separate transfer sheets, a mode in which two areas are copied on the front and back sides of one sheet of transfer paper, and a mode in which two areas are copied on one side of one sheet of transfer paper. Each time the transfer key 77 is pressed while being guided by the dot matrix display 88, the three modes change sequentially to receive instructions from the operator.

When the transfer mode is set, the transfer indicator 81 is turned on.

76: Binding Margin Key Receives an instruction to form a margin at the leading or trailing edge of the transfer paper and to change the binding margin forming mode and binding margin width data. Lead edge binding, trailing edge binding, and no binding margin displayed on the dot matrix display 88 change each time the binding margin key 76 is pressed, and are selected and instructed by the operator. When the binding margin mode is set, the binding margin is displayed! Turn on 80.

75: Frame erase key Receives a frame erase mode for forming a margin around the transfer paper and an instruction to change frame width data. When the frame eraser mode is set, the frame eraser indicator 79 is turned on.

71: Movement key Accepts a mode in which the image of the original is moved in the scanning direction of the optical scanning system and copied onto transfer paper, and a mode in which data on the amount of movement is accepted. When setting the movement mode,
The movement indicator 78 is turned on.

85: Corner erase confirmation key Accepts a mode for forming a margin at a corner and a mode for confirming the position and size of a corner.

When the corner erasing confirmation mode is set, the corner erasing confirmation indicator 82 is turned on. When the corner erasure confirmation mode is set, the dot matrix display 88 shows a triangle mark 41 (see FIG. 1) corresponding to the center position of the document provided on the document abutting plate on one side of the contact glass 1. A triangular mark 41', a rectangular frame line indicating the outline of the document, and numbers 1 to 1 marked in order at each corner of the rectangular frame line.
The number 4 and the length of the side perpendicular to the size of the corner to be erased are displayed. In this display example, the size of the corner to be erased is displayed as 30 mm.

86: Corner size key Receives an instruction to change the size data for erasing a corner. When this is instructed, the numerical value of the size of the corner to be erased displayed on the display 88 flashes, and the new data entered manually using the numeric keypad 44 is accepted.

FIG. 5 shows an editor 40 (coordinate input device) that can replace the numeric keypad 44 and allow easier input of coordinate data, width data, movement data, etc. associated with editing. A triangular mark 41' provided on the right side of the editor 40 indicates the center position of the leading edge of the original when the original is placed on the editor 44, and corresponds to the triangular mark 41 shown in FIG.

That is, the editor 40 turns the image side of the document into the front side,
Specify an area by aligning the center of the leading edge with the triangular mark 41', rotate the original 180 degrees left and right, turn it over, and align the center of the leading edge of the original with the triangular mark 41 of the original abutting plate on the contact glass 1. By placing them together, a correspondence relationship between the editor 40 and the contact glass 1 is determined so that editing can be performed for the region designation data and the designated region.

When the mode is set to accept area data, the CPU 90 recognizes a rectangular area having sides perpendicular to the scanning direction of the optical scanning system using two inputs from the editor 40. In a mode that accepts width data such as frame erasing and binding margin, the distance in the scanning direction component of the optical scanning system between two points is recognized as the width. In the movement mode, the specified order of the scanning direction components of the two points is determined to be the vector direction, and the length thereof is taken as the movement amount. The editor 40 is provided with an inner erase key 66, a memory key 67, a binding margin key 76, a frame erase key 75, a movement key 71, etc., which have the same functions as the operation board 42, and allows input with a stylus pen 72. It has become.

The operator inputs desired copy conditions by appropriately operating keys provided on the operation board, and then inputs a copy start instruction using the print key 43. The CPU 90 uses this copy start instruction as a trigger signal to perform a copy operation based on the copy conditions described above.

First, a normal copy operation will be explained. FIG. 6 is a flowchart of the copy operation. A rough explanation of this flowchart is as follows.

S1: When the power switch is turned on, the output board, RAM, etc. are cleared to initialize the copying machine.

82 to S6: Scan the protection circuit, etc. to detect abnormalities in each part of the device, and also read the transfer paper size of the paper feed cassette and store it in the RAM.

If there is an abnormality in the protection circuit, an abnormality is displayed on the operation board 42. When the abnormality is removed and the copying machine is ready for operation, the abnormality display is reset.

S7: Set the standard mode, set the number of copies: 1, paper feed system 2 upper stage, variable magnification 2 equal magnification, movement: none, and set the state of no other keys as the copy conditions.

S8: A state in which the erase area is set based on the size of the transfer paper and data on the leading edge and trailing edge according to the transfer paper size of the set paper feed system, stored in the memory, and the erase area data can be sent to the eraser 24. Make it.

If the copy is possible, press -35 on the print key 43.
Turn on the green lamp and set copy ready.

S9: Read input from the operator via the operation board 42 and write it to the RAM.

SIO~816: When the print key 43 is pressed and a copy start instruction is input, a copy is created according to the set copy conditions. When the copy cycle ends, an end cycle is started and the number of copies is displayed on the display 47.

S17: When an abnormality such as a paper jam occurs in the copying apparatus, the apparatus is stopped and abnormality processing such as a jam display is performed.

818-S20: Create a set number of copies by repeat processing. At this time, when the operator operates the clear stop key 45, the repeat processing is stopped.

821 to S24: An input waiting loop is formed when the set number of copies are completed or the repeat is stopped.

S22: When the operator operates various mode setting switches on the operation board during the input waiting loop, a corresponding operation sequence is set.

S23: Every time a key on the operation board is operated and a corresponding operation sequence is set, the elapsed time timer is reset.

S24: If a mode other than the standard mode is set and there is no key operation within a predetermined period of time, the mode is automatically returned to the standard mode.

Next, to explain the operation sequence of the main parts in a little more detail, when a copy start instruction is input, each component is controlled in the order of start cycle (S12), copy cycle (S13), and end cycle (S14) to process the copy process. Execute.

The start cycle (S 1 2) is performed for the purpose of stabilizing the mechanical vibration system and equalizing the initial exposure conditions. First, a drive circuit such as a main motor is energized, and then the photosensitive surface is cleaned while the photosensitive drum 9 is rotated. This cleaning is performed by the cleaning unit 22.
The photosensitive surface of the photosensitive drum 9 is cleaned and neutralized by a pre-cleaning static eliminating lamp and a grounded conductive brush, and the toner remaining on the surface is wiped away by a cleaning blade. Once the drive system has stabilized and the photosensitive surface has been cleaned and neutralized, the next copy cycle begins.

In the copy cycle, first, the charger 23 uniformly charges the photosensitive surface of the photosensitive drum 9, and the eraser 24
After exposing the original image according to the transfer paper size, unnecessary areas are erased.

Next, the optical scanning system is driven in synchronization with the rotation of the photosensitive drum 9 to start scanning the document surface. Through this scanning, the reflected light from the original is irradiated onto the photosensitive surface of the photoreceptor drum 9, the surface potential changes depending on the intensity of the reflected light from the original, and an electrostatic latent image is formed on the photoreceptor drum 9. This electrostatic latent image is visualized by toner adhering to it while the photoreceptor drum 9 rotates and passes through a developing device 10 .

The transfer paper, which has been conveyed to the registration roller 17 before the start of exposure, is fed toward the photoreceptor drum 9 by controlling the registration roller 17 at a predetermined timing according to the rotation of the photoreceptor drum 9. When the transfer paper passes under the transfer charger 19 to which a predetermined voltage is applied, it comes into contact with the toner image formed on the photosensitive surface of the photosensitive drum 9,
The toner image is transferred.

The transfer paper on which the toner image has been transferred is separated from the photosensitive drum 9 by a separation charger 20 and a separation claw 18, and is sent to a fixing device 21 via a conveyor belt. Fuser 2
1 has a roller with a built-in heater, and the toner image on the transfer paper is fixed here. The photosensitive surface after the toner image transfer passes through the cleaning unit 22 by the rotation of the photosensitive drum 9, and cleaning and charge removal are performed in the same manner as described above.

The CPU 90 controls the conveying path controller according to the copying conditions set by the operator, and conveys the transfer paper after leaving the fixing device 21. After making a copy according to the copy conditions, the paper is ejected from the ejection conveyance path to an external tray.

After repeating the above copy cycle for a set number of copies, in an end cycle (S14), the photosensitive surface is cleaned and static electricity is removed while the photosensitive drum 9 rotates once in order to maintain stability and protect the photosensitive surface. If there is a copy start instruction during this end cycle, the start cycle is omitted and the copy cycle is executed.

When the CPU 90 is set to a mode that requires partial erasure such as binding margin, border erasure, inner erasure, outer erasure, and corner erasure, the CPU 90 operates the numeric keypad 44 or editor 40, or erases the binding margin, frame erasure, and corner erasure. In this case, when correction data is not input, an erase area is set according to preset data, and the eraser 24 is controlled according to the erase area to erase unnecessary charges on the photosensitive surface.

FIG. 7 is a perspective view of the eraser 24. As shown in the figure, on the eraser 24, a large number (for example, 120) of LEDs 83 are arranged in a line along the width direction of the photosensitive drum 9, and each LED 83 is turned on and turned on individually by the drive controller 40 and the plate 84. It can be turned off.

Next, the corner erasing mode set by the corner erasing key 85 and the corner size key 86 will be explained.

When the corner erasing key 85 is operated and the CPU 90 accepts the corner erasing mode, the dot matrix display 88 displays a mark 41', four frame lines indicating the outline of the document, and four corners as shown in FIG. The numbers 1 to 4 indicating the position of the corner and the length of the side perpendicular to the size of the corner to be erased are displayed. What is displayed in the display 88 as r size 30J is the length of the orthogonal sides.

The square frame line shown on the display 88 indicates the relationship between the original and the triangular mark 41 at the center of the original abutting plate when the original is placed on the contact glass 1 with the side to be copied facing down.

This is different from the case where the editor 4o specifies the position of the area to be erased inside or outside of the original with the side of the original to be copied facing up, for operational convenience. In other words, flip over the document whose corners are stapled and press the contact glass 1.
It is displayed exactly as it was when it was placed on top.

Depending on which of the four corners needs to be erased, the operator can
By specifying the numbers ˜4 using the numeric keypad, you can specify the corner to be erased. The triangular part of the corner before being specified is displayed with an outline, and once specified, the interior of the triangle is filled in so that the operator can confirm the selection result.

There is no limit to the number of corners to be specified, and any number from 1 to 4 can be selected. This is because when copying a corner-bound original while turning the pages, the number of turned pages gradually increases and the number of remaining pages decreases. Since the posture and the posture that makes it easier to set as you proceed with page turning often change, select multiple corners to be erased in advance and erase the corners again during the copying process. This function eliminates the need to reselect the location.

The shape of the area to be erased is a right-angled isosceles triangle corresponding to the corner of the original or transfer paper. The size is displayed on the display 88 by numerically indicating the length of orthogonal sides. If this number is not specified by the operator, the initial value is 3.
Values within and outside 0 mm are stored in the ROM 93, and the values are displayed and corner erasing processing is executed based on the data. An operator who wishes to repeatedly use a value different from the initial value can store the value different from the initial value in the NRAM 95 using the memory key 67 in the corner erasing mode. Since the data stored in the NRAM 95 is retained after the copying machine is powered off, it is used as a standard value for subsequent corner erasing mode.

The size of the triangular missing part that is created when the original is turned over depends on the position of the staples that bind the document, so even if you erase the corners using the data stored in the ROM 93 or NRAM 95, the missing part will still be hidden. A shadow appears on the copy, M! There may be an inconvenience that 16 data are deleted. In such a case, the operator can change the size of the corner eraser using the corner size key 86 according to the condition of the document to be copied.

When the corner size key 86 is pressed, a numerical value indicating the length of the side of the right triangle in the area to be erased flashes on the display 88, and new data can be entered using the numeric keypad 44. The input numerical value is displayed as it is in a flashing manner, and when the corner size key 86 is further pressed, it is displayed continuously and becomes valid data for corner erasing.

This data is 82 in the flowchart shown in Figure 6.
It is reset when the time is up in step 4, and when the corner erasing mode is specified thereafter, corner erasing is performed using the data stored in the memory.

When the operator selects the corner erasing mode and determines the size of corner erasing, the CPU 90 selects the transfer paper size selected at that time, the document size obtained from the ADF, or the document size obtained by the document size detector. Based on the data, data for blinking the eraser 24 is created from the specified corner position data and the corner size data, and is stored in the RAM 94.

When the operator sets a document and presses the print 1 key 43 to start a copy cycle, the corner eraser data is read out as the copy sequence progresses, and data and control signals are sent to the eraser 24 via the interface 97. , blinks at a predetermined timing to prevent the corner image from being formed on the transfer paper.

In the above explanation, the shape whose corners are erased is a right-angled isosceles triangle, but as explained in FIG. When erasing a corner by controlling their lighting, if the corner to be erased is on the upstream side in the scanning direction of the scanning optical system, the number of LEDs 83 to be lit is reduced at a predetermined timing. , the LED lights up when the corner to be erased is on the downstream side in the scanning direction.
By sequentially increasing the number of 83, the hypotenuse of the triangle to be erased becomes step-like.

The timing to change the number of lit LEDs 83 is determined by the CPU 90.
If the running time of the photoreceptor drum 9 cannot be made to match the pitch of the eraser 24 due to processing reasons, it will not become a right-angled isosceles triangle but will become a scalene triangle.

The light of LED83 that is lit is LED8 that is not lit.
It leaks into the irradiation area of step 3 and the border is not clear. Although there are several factors that prevent these erased shapes from becoming right-angled isosceles triangles, the object of the present invention, which is to prevent contamination due to corner bending, can be achieved. Furthermore, it is also possible to positively form a scalene triangle to accommodate the fact that the staple is attached offset from the corner.

It is also possible to approximate the oblique side to a curved line and combine this with the frame erase mode to provide a function such as rounding the edges around the image.

FIG. 10 is a flowchart of corner erasing control, FIG. 11 is a diagram for explaining the corner erasing amount and erase amount, FIG. 12 is an eraser drive circuit diagram, and FIG. 13 is a timing chart when transmitting erase data.

In this specific example, L of 2.5+nm pitch 120 dots is used.
An example is described in which corners are erased by irradiating a photoreceptor drum with an eraser having an ED array.

The corner erasing control routine is a routine that is called every time a drum clock (a clock signal generated every 0.25 mm of the circumference of the photosensitive drum in synchronization with the drive of the main body) interrupts.

81-S2: It is determined whether the erase off flag=1. The erase/off flag is a flag used for determining the end of control in addition to the corner erase mode. When the leading edge of the latent image formed on the photosensitive drum is detected in S2, corner erasing control is started.

83~S5: As mentioned before, the LED pitch of the eraser is 2.5m+n bit, and the photoreceptor drum is 0.25m.
Because it is controlled by mn pitch, the drum clock 10
A control routine is entered every 2.5 fields of pulse.

86 to S7 The erase amount b (see FIG. 11) calculated at the time of inputting the square erase mode is calculated from the corner erase amount a by r a
It is obtained from X 5 / 2 = b J, and the corner erasure amount a is in units of m. In this step 0〈b is YES
If so, it means that the mode has been set, and if No, the erase off flag is set to 1 at 87, and the erase is turned off thereafter.

S8: Edit the above erase amount b/○ Interface 9
Input and set as erase data from the communication serial port of 7.

S9: Transmission uses synchronous mode, TXD (
(see Figure 12), on data from O to 0 bit, b+1
SC off data from to 120 bits in 8-bit units
K (see Figure 12) for a total of 120 bits (1
5 bytes). The data of the LED 120 is then sequentially input to the shift register, latch, and driver (TD62801). Once all have been input, the erase on the opposite side is obtained in the same way by inverting the data from the center and incrementing the data by 1 for the lower side, and the LED is lit by the LATCH output.

Figure 13 is a timing chart for transmitting erase data in synchronous mode. As shown in the figure, the erase data to be transmitted has a fixed character length of 8 bits, no validity bit, and is serially transmitted from the least significant bit (LSB). It is designed to be transmitted at the rising edge of the clock (SCK).

S10: By subtracting the erase amount b and reducing the next light emission bit by 1, repeating the process until the erase amount becomes 0, corner erasure as shown in FIG. 11 is performed.

Normally, documents are often stapled at the top left corner, and the orientation in which they are set on the contact glass is generally constant. Therefore, by using the used corner-erasing data as the registered data thereafter, in many cases, the operator does not need to instruct the operator to change the corner-erasing data, thereby improving operability.

Furthermore, rather than fixing this registration data to match the average usage of the copying device, it is better to update the registration data to match the usage of the copying machine, as it will be more responsive to each individual's special usage.
It is possible to further improve operability.

If the corner that the operator wants to erase matches the corner registered in advance as an area to be erased, the operation of specifying the corner to be erased can be omitted. If frequently used corners are registered in advance, the operation of specifying the corners can often be omitted.

On the other hand, if it is inconvenient to delete the registered corner, enter the number of the triangle that is also displayed on the numeric keypad 4.
By specifying 4, it can be excluded from the area to be erased.

The data on the position of the corner and the size of the corner which the operator has been instructed to add or change is set by rewriting the data in the RAM 94. The display 88 is controlled by the set corner erase data, and is also used to determine the erase amount described above.

Next, the situation of a document when a large number of documents whose corners are stapled are sequentially copied will be described with reference to FIGS. 8 and 9.

FIG. 8(a) shows a state in which the upper left corner of the document 101 is bound with staples 102 when viewed from the top surface. The state shown in FIG. 8(b) is when the first document 101 is turned over and placed next to the final document. At this time, since all the corners of the second and subsequent documents are folded, the thickness of the document 101 causes the document 101 to shift at the right side and bottom edge of the multiple documents 101, as shown in the figure. As the number of pages turned increases further, as shown in Figure 8 (c
), a misalignment occurs between the top side and the left side of the turned document 101. This is the reason why it becomes increasingly difficult to set the original when copying by erasing one corner.

As another example, there is an example in which the pages are turned over as shown in FIG.

However, in this case as well, it is difficult to copy all the originals 101 in this state, and when the number of originals 101 to be folded increases and more than half of the originals 101 are folded, the corners indicated by chain lines 103 are changed to the corners indicated by chain lines 104, or If the original document 101 is not set as shown in FIGS. (b) and (c), it will be very difficult to set it on the contact glass 1, so it is often more convenient to change the position of the corner to be bent.

The corners must be erased when copying not only stapled originals, but also stapled originals that are folded back and read, resulting in creases in the corners, or stapled originals. Even if you remove the stable and copy the original in pieces, you can prevent the holes formed by the stable from being copied or the shadows of the original's folds from being copied. effective.

FIG. 14 is an enlarged plan view of an operation board in a copying apparatus according to a second embodiment of the present invention.

The difference between this embodiment and the first embodiment shown in FIG. 4 is that in the dot matrix display 88, pairs of diagonal corners that can be erased are displayed with numbers 1 and 2.

To determine which set of corners to erase, press “1” on the numeric keypad 44.
” or “2” or “1” and “2” (select all corners), and the corners specified in this way are erased in the same way.

To explain this more specifically, as the page turning progresses as shown in FIG.
The position that makes it easier to set the document on the document abutting plate will change.

In other words, when the number of pages turned is relatively small,
It is easier to set the document by abutting the left side of the document in Figure (b), and the gap between the abutment plate and the document can be easily eliminated. As the page continues to turn, it is easier to set the page by hitting the right side of FIG. 8(c). In order to copy in a direction that is easy to set, the orientation of the original must be rotated 180 degrees during the copying process. 1
If the document is rotated by 80 degrees, the binding position of the document will naturally move to a position symmetrical to the point rotated by 180 degrees. In order to accommodate this movement, if the corner to be erased is specified in advance at a point-symmetrical (diagonal) position, the operator does not have to re-specify the corner to be erased during a series of copying operations. This improves operability.

In this example, as shown on the display 88, the upper left corner and the lower right corner form a set with the number "1", and the lower left corner and the upper right corner form a pair. They form a set and are numbered "2". However, the present invention is not limited to this, and the upper and lower corners may be combined into pairs, such as the upper right and lower right corners being one set, and the upper left and lower left corners being one set. , can also be deleted at the same time.

In this way, each set has two corners, but if the same code, such as a numerical value, alphabet, or other mark, is attached to each corner, the relationship between a pair of sets can be made clear without complicating the display. Operator operations can be facilitated.

As mentioned before, if you copy a corner-bound manuscript while turning the pages, the number of pages turned will gradually increase and the number of remaining pages will decrease, so it is best to set it on the contact glass at first. The position of the original that is easy to read and the position that makes it easy to set the page as you turn the pages often change. Therefore, if a plurality of corners to be erased are selected in advance, there is no need to select a new position to be erased during the copying process, and the copying process can be performed continuously.

FIG. 15 is an enlarged plan view of an operation board in a copying apparatus according to a third embodiment of the present invention.

In this embodiment, when the corner erase key 85 is operated, the CPU
90 receives the corner erase mode, as shown in FIG. 15, the dot matrix display 88 displays a triangular mark 41', a rectangular frame line indicating the outline of the document, and 4 areas registered in advance as areas to be erased. 3 corners (all the triangles are filled in as shown in the figure) and a numerical value (size 30) indicating the size to be erased.

In this embodiment, the corners to be erased are predetermined to be all four corners, so the operator does not need to specify the positions of the corners. That is, by selecting the corner erasing mode, the erasing area is automatically determined, which simplifies the operation. Note that in this embodiment, the corner to be erased is indicated on the display 88.
However, since the corner to be erased is fixed, the display of its position may be omitted.

Normal manuscripts have margins at each of the four corners, so
Erasing all four corners rarely causes any inconvenience.

As mentioned earlier, when copying a corner-bound original while turning the pages, the position that makes it easier to set the original on the contact glass will change from the beginning to when the pages are turned. Well, there are many things that change. If all four corners are used as erasing areas as in this embodiment, there is no need to consider the position of the corner to be erased when the orientation of the document is changed during copying.
Easy to operate.

FIG. 16 is an enlarged plan view of an operation panel in a copying apparatus according to a fourth embodiment of the present invention.

In this example, depending on the condition of the original to be copied,
The operator can change the size of corner erasing using the corner size key 86. When the corner size key 86 is pressed, the lengths of the vertical and horizontal sides of the right triangle in the area to be erased are displayed as numerical values on the dot matrix display 88, as shown in FIG. It flashes and new data can be entered using the numeric keypad 44. The input order is predetermined, and in this embodiment, it is vertical and horizontal.

When the operator inputs vertical data as a two-digit number,
The same numerical values as the vertical data are accepted and displayed for the horizontal data, and the mode automatically shifts to a mode in which horizontal data can be entered. In this state, the vertical and horizontal values are the same, which means that the isosceles triangle area is designated as the corner-erasing area. Here corner size key 86
By pressing , the blinking numerical value will be displayed continuously and become valid data for corner erasing.

If you want to change the horizontal length to the vertical length, you can enter the desired value using the numeric keypad 44 in the mode where horizontal data can be input. In this case, the entered vertical and horizontal values will be displayed as they are, blinking, and the corner size key 8 will be displayed.
By pressing 6, the data is displayed continuously, and becomes valid data for the erased corner area of the scalene triangle.

Once the vertical and horizontal data are determined, the shape of each corner to be erased is determined. For any of the four corners, the vertical data determines the vertical length, and the horizontal data determines the horizontal length, so
The shape of each corner to be erased is a symmetrical area with respect to a bisector parallel to the sides of the original (transfer paper).

As mentioned above, when you input vertical data, that data becomes horizontal data as well, because in many cases when using a corner eraser, you only need to erase an area where the vertical and horizontal lengths are equal. This is intended to improve operability by omitting data input operations.

17 is a perspective view of a copying apparatus according to a fifth embodiment of the present invention, FIG. 18 is a perspective view of an editor, FIG. 19 is an enlarged plan view of an operation board in the copying apparatus, and FIG. 20 is a perspective view of the copying apparatus. A schematic configuration diagram, FIG. 21 is a block diagram showing an outline of an electric circuit.

In the embodiments so far, a triangular mark 41 is attached to the center of the contact glass 1, as shown in FIG. I have explained the device.

In this embodiment, as shown in FIG. 17, a triangular mark 41 on the contact glass 1 is placed near the lower left corner, and this corner is where the original is set, regardless of its size. This figure shows an example of a so-called one-sided reference type copying apparatus, which serves as a reference position that is commonly abutted.

Correspondingly, in the editor 40 shown in FIG. 18, a triangular mark 41' is provided near the lower right corner. Further, in the dot matrix display 88 shown in FIG. 19, a triangular mark 41' is attached to the lower left corner of a rectangular frame indicating the outer shape of the document.

When the corner erasing confirmation mode is set, the corner erasing confirmation key 85 shown in FIG.
A mark 41' corresponding to mark 4 (see FIG. 17), which is provided on the document abutment plate around the document abutment plate and indicates the corner to which the document should be abutted, is displayed. Additionally, a rectangular frame indicating the outline of the document, the corner to be erased, and the length of the sides perpendicular to the size of the corner to be erased are displayed numerically.

The copy cycle of the copying apparatus will be explained using FIG. 20. First, the photosensitive surface of the photosensitive drum 9 is uniformly charged by the charging charger 23. Subsequently, the optical scanning system is driven at a speed synchronized with the rotation of the photosensitive drum 9, and scanning of the document surface is started. When the scanning position reaches the vicinity of the leading edge of the document, use the exposure lamp 3 as a light source to determine whether or not there is a document at the common corner 41 (see FIG. 17) of the document abutting section (reference position). a detection unit 11 that receives reflected light from the
Detected by 0.

The position for detecting the presence or absence of a document is 3Hl from the leading edge of the document.
The position is 5+nm from the end.

This is because when detecting the presence or absence of a document, if there is a black image of the document, it will be determined that there is no document, so it is detected as close to the edge of the document as possible (most documents have margins around them). This selection was made to prevent an erroneous =60 determination, and to enable erasing even if the presence or absence of a document is detected after the start of exposure and corner erasing is performed based on the detection result. During the time lag between the exposure position and the erase position of the photoconductor, the CPU 9 performs detection for corner erasing and data processing up to the start of erase.
0 must be terminated. Conversely, if the detected position is too close to the edge of the document, there is a risk that a gap caused by misalignment of the document set may be mistakenly determined to be a missing corner of the document. For this reason, the position for detecting the presence or absence of a document was determined as described above.

The detection unit 110 shown in FIG. 20 is placed in a position that does not interfere with the movement of the document scanning system and can receive reflected light from a common corner 41 of the document abutting section. Although not shown, the detection unit 110 includes a light emitting element, a lens, a filter, and the like. Since the lens focuses on the document surface, the light receiving element detects the presence or absence of the document at the corner using a signal with a high S/N ratio.

In order to detect the presence or absence of a document with the document pressure plate 2 closed,
The surface of the document pressure plate 2 facing the contact glass 1 is colored yellow, which is included in the spectrum band to which the photoreceptor drum 9 is highly sensitive. This yellow colored original pressure plate 2
reflects yellow light when irradiated by the exposure lamp 3, and the photoreceptor drum 9 has high sensitivity to light in this band, so the potential of the photoreceptor drum 9 is approximately the same as that of the white part of the document. This eliminates background stains caused by yellow coloring on copies. It is not necessary to color the entire surface of the document pressure plate 2 yellow because only the portion that detects the presence or absence of a document needs to be colored yellow.

On the other hand, the detection unit 101 is equipped with a filter that blocks light with wavelengths longer than yellow, and receives strong light when reflected from white paper, which is a general background, and receives weak light when it receives light reflected from the yellow document pressure plate 2. receive. Therefore, if a corner of the document is bent and a missing area is formed, it will receive reflected light from the document pressure plate 2, and therefore weak light will be received.

Here, the original pressure plate 2 does not necessarily have to be yellow only for the purpose of detecting missing corners of the original.

For example, detection is possible even if the color is black. If a corner of the document is missing, it will be detected and
Since a margin is created at the corresponding corner, there is no problem even if it is black. However, if the document is thin and there are no missing corners, the black of the document pressure plate on the back may show through, causing background stains on the copy. ing.

When the scanning position of the document reaches the leading edge of the document, if the light received by the detection unit I-110 is weak, it is determined that there is a missing corner of the document, and as a result, the corner erase mode is activated. ).

The light reflected by the scanning of the original by the optical scanning system is irradiated onto the photosensitive surface, the surface potential of which changes depending on the intensity of the reflected light from the original, and an electrostatic latent image is formed on the photosensitive surface of the photosensitive drum 9. .

An eraser 24 erases unnecessary areas after exposing the original image according to the transfer paper size. At this time, if the detection unit 110 detects a missing corner of the document and the corner erasing mode is set, the area corresponding to the corner is also erased 63 . After that, develop, transfer, fix, eject the paper, and follow the usual methods.
Various operations such as cleaning are performed.

Next, we will explain the partial erase function that the CPU 90 executes when instructions such as binding margin, border erase, move, inner erase, outer erase, etc. are given from the keys on the operation board 42, and when the corner erase mode is automatically set. .

When the CPU 90 is set to a mode that requires partial erasure, and when correction data is not input due to operation of the numeric keypad 44 or editor 40, binding margin, or border erasure, the CPU 90 inputs data according to preset data, or Unnecessary charges on the photoreceptor are erased by detecting the omission of each drum of the original, setting an erasing area, and controlling the eraser 24 on and off according to the erasing area.

After the operator sets the document, the copying cycle starts by pressing the print key 43, and when the optical scanning system determines whether the corner of the document is missing, corner erasing data is read out as the copying sequence progresses, and the interface 97
Data and control signals are sent to the eraser 24 via the eraser 24 to blink at a predetermined timing to prevent the corner image from being formed on the transfer paper.

Therefore, in this embodiment, the corner to be erased is determined to be the corner against which the document is commonly abutted.

Therefore, the operator does not need to select or specify the position of the corner, and when the corner erasing mode is selected, the corner erasing area is automatically determined, simplifying the operation.

Furthermore, since the erase area is a common corner that does not depend on the document size, it is very easy for the operator to understand the operation.

In this embodiment, the corner to be erased is displayed on the display 88, but since the corner to be erased is fixed, it is not necessary to display it.

FIG. 22 is an enlarged view of an operation board in a copying machine according to a sixth embodiment of the present invention.

The difference between this embodiment and the fifth embodiment is that in this embodiment, as shown in the figure, there is a corner marked with a triangular mark 41', and an opposite corner on the corner line with the corner. Both parts can be specified at the same time. Therefore, even if the orientation of the document changes, the operator does not need to specify the position of the corner.

Note that also in these fifth and sixth embodiments,
It goes without saying that the size of the corner can be changed as necessary.

23 and 24 are diagrams for explaining a pressure plate opening angle detection means of a copying apparatus according to a seventh embodiment of the present invention.

This embodiment is also a one-sided reference type copying machine like the fifth embodiment, and therefore the positions of the triangular marks 41 and 41', the arrangement of the keys on the operation board, the position of the detection unit 110, and the outline of the electric circuit. Since the configuration and the like are almost the same as those shown in FIGS. 17 to 21, their explanation will be omitted.

The operator inputs desired copying conditions by appropriately operating the keys on the operation board 42, sets the original against a predetermined corner on the contact glass 1, and closes the original pressure plate 2.

It is composed of a photointerrupter 111 and the like that detects the opening angle of the document pressure plate 2 so that the detection unit 110 can detect the presence or absence of a document when the document pressure plate 2 reaches a predetermined angle while being closed. A pressure plate closing angle detection means is provided.

Next, the configuration, operation, etc. of this pressure plate closing angle detection means will be explained using FIGS. 23 and 24.

The original pressure plate 2 is configured to rotate around a support shaft 112 as shown in 2', 2', 2. A light shielding plate 113 is integrally attached to the base end side of the original pressure plate 2.
The light-shielding plate 113 also rotates 113'', 113'113 in response to the open/closed states 2', 2'2 of the document pressure plate 2. A photo-shielding plate 113 is used as a switch for detecting the closing angle of the document pressure plate 2. The inruptor 111 includes the light shielding plate 11
It is provided at a predetermined position in the rotation area No. 3.

In this embodiment, when the closing angle θ of the document pressing plate 2 becomes approximately 30 degrees or less, the light shielding plate 113 blocks the detection position of the photo-inrupter 111, and due to the blocking operation, the photo-inrupter 111 receives the }IIGH signal. It is designed to output . The output signal of this photo-inrupter 111 is inputted to the CPU 90 via an interface 97 as one of the sensors and switches 114 shown in FIG.

When the CPU 90 detects that the output of the photo-inrupter 111 changes from LOW to HIGH, that is, the opening degree and moving direction (closing direction) of the document pressure plate 2, the detection unit 110 outputs a signal indicating whether or not a corner of the document is missing. In order to capture the light, the light emitting diode in the detection unit 110 is turned on. The output of the detection unit 110 obtained as a result is read, and when the reading is completed, the light emitting diode is turned off to prevent an adverse effect on the image when copying the original. In other words, when the document pressure plate 2 reaches a predetermined angle (for example, about 30 degrees) during the closing process, by detecting the presence or absence of missing parts at the corners of the document, the parts corresponding to the corners of the document pressure plate become white. However, the presence or absence of missing corners can be determined without being affected by this.

In this embodiment, the light shielding plate 1 rotates together with the original pressure plate 2.
13 and a photointerceptor 111 placed at a predetermined position.
Although the pressure plate closing angle detecting means is constituted by the above, the present invention is not limited to this, and for example, mechanical means such as a micro switch, magnetic means such as a reed switch, etc. can be applied.

[Effects] The present invention has the above-described configuration, and when copying a plurality of stacked originals with the corners stapled, the originals are set one after another on a contact glass while turning the pages. With a simple operation, it is possible to prevent the formation of triangular missing parts due to folded corner parts, or the lifting of the original pressure plate due to overlapping originals, and the appearance of shadows on copies.

Therefore, it is possible to obtain a copy with no stains on the corners without removing the staples, and since there is no need to remove the staples each time, there is no need to remove the corners of the original, which will cause damage to the original.

In addition, when setting the corner erasing mode, the document abutment reference position and the position of each corner to be erased are displayed. Therefore, the operator can accurately specify the corner to be erased while looking at this display, and there will be no erroneous operation.

Furthermore, when specifying the corner to be erased and its size, the operation is very simple because the size to be erased is the same for each corner and there is no need to specify the size one by one. .

Furthermore, if a corner specifying means is provided for specifying at least one of the two sets of opposing corners of a document, the position of the corner may be moved as the document posture changes during a series of copying operations. There is also no need to re-specify the position of the corner to be erased during the copying process, improving operability.

Furthermore, if a corner erasing data changing means for changing the corner erasing data is provided, the position of the corner to be erased or (and)
The size of the corner can be easily and reliably changed.

Additionally, if all four corners of the document are predetermined to be erased, the operator can specify the position of the corner to be erased, or select the corner to be erased each time the document is set in a different position. There is no need to change the position, simplifying the operation.

If the lengths of the two orthogonal vertical and horizontal sides of the triangle to be erased can be changed, image formation prevention areas can be created in various triangular shapes other than isosceles triangles depending on the direction of the staple, etc. It is possible.

Furthermore, in the case of the so-called one-sided reference type, which has an abutment corner that is commonly used for all manuscripts, the corner to be erased is determined to be the corner abutted against the abutment corner. There is.

Therefore, the operator does not need to select or specify the position of the corner, and when the corner erasing mode is entered, the corner is automatically erased, which simplifies the operation.

Additionally, if the corners of the document are detected while the document pressure plate is being closed, there is no need to determine the erase data after optical scanning begins, which has the advantage of providing more leeway in data processing. There is.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the external appearance of a copying device according to an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of the copying device, FIG. 3 is a block diagram showing an outline of an electric circuit, and FIG. 4 is an operation board. 5 is a perspective view of the editor, FIG. 6 is a flowchart of the copying operation, FIG. 7 is a perspective view showing the appearance of the eraser, and FIGS. 8(a), (b), (C) and Figure 9 is a diagram to explain the situation of the original when copying, Figure 10
11 is a diagram for explaining the amount of corner erasure, FIG. 12 is an eraser drive circuit diagram, FIG. 13 is a timing chart when transmitting eraser data, and FIGS. 14 and 15. 16 is an enlarged plan view of the operation board in the copying apparatus according to the second to fourth embodiments of the present invention, and FIG. 17 is a perspective view of the copying apparatus according to the fifth embodiment of the present invention. Fig. 18 is a perspective view of an editor connectable to the copying machine, Fig. 19 is an enlarged plan view of the operation board in this embodiment, Fig. 20 is a schematic configuration diagram of the copying machine, and Fig. 21 is an outline of the electric circuit. FIG. 22 is an enlarged plan view of an operation board in a copying apparatus according to a sixth embodiment of the present invention, and FIGS. 23 and 24 are views showing the opening of the pressure plate of a copying apparatus according to a seventh embodiment of the present invention. It is a side view of an angle detection means. 1... Contact glass, 2... Original pressure plate,
24... Eraser, 41... Triangle mark, 52... Mark, 42... Operation board, 67... Memory key, 82...・・・・・・
・Corner eraser indicator, 83...LED, 84...
Drive control board, 85... Corner eraser key, 86.
... Square size key, 90 ... CPU, 94 ...
・RAM, 95...NRAM, 101...
...Manuscript, 102...Stable, 110...
...detection unit, 111 ... photo interrupter, 113 ... light shielding plate. Agent: Patent attorney Kenjiro Take (1 other person) Figure 10 Figure 11 G Figure 17 Figure 18

Claims (14)

[Claims] (1) A copying apparatus comprising an image formation preventing means for preventing image formation on at least one corner of a document to be copied. (2) A corner specifying means for specifying at least one corner of a document to be copied, and an image formation preventing means for preventing image formation at the corner specified by the corner specifying means. A copying device characterized by: (3) A corner specifying means for specifying at least one corner of a document to be copied, and an image formation preventing means for preventing image formation at the corner specified by the corner specifying means, the corner 1. A copying apparatus, wherein the copy specifying means is configured to display a reference position for setting a document and a corner position of the document. (4) a corner specifying means for specifying at least one corner of a document to be copied; a size specifying means for specifying the size of the corner specified by the corner specifying means; 1. A copying apparatus comprising: an image formation preventing means for preventing image formation in a designated area. (5) Corner specifying means for specifying at least one set of two opposing corners of a document to be copied, and image formation of at least one set of corners specified by the corner specifying means. What is claimed is: 1. A copying apparatus comprising: an image formation preventing means for preventing image formation. (6) Corner specifying means for specifying at least one of two sets of opposing corners of a document to be copied, and an image that prevents image formation at the corner specified by the corner specifying means. 1. A copying apparatus comprising: a corner specifying means configured to display a reference position at which a document is set and a position of a set of corners of the document. (7) a corner erasing mode selection means for selecting a corner erasing mode that prevents image formation on at least one corner of a document to be copied; a memory means for storing corner erasing data; and a corner erasing mode selecting means. and an image formation preventing means for preventing image formation on the corner based on a command from the corner erasing mode selection means, the corner erasing mode selection means selects a designated corner erasing mode based on the corner erasing data stored in advance in the storage means. 1. A copying apparatus, wherein the copying apparatus is configured to prevent image formation at a corner where the image is formed. (8) corner erasing mode selection means for selecting a mode for preventing image formation at at least one corner of a document to be copied;
a storage means for storing corner erasing data; a corner erasing data changing means for changing the corner erasing data stored in the memory means; and a corner erasing data changing means capable of changing the corner erasing data stored in the memory means, 1. An image formation preventing means for preventing image formation at the corner based on corner erasing data. (9) corner erasing mode selection means for selecting a mode that prevents image formation at at least one corner of a document to be copied;
a storage means for storing corner erasing data; an image formation preventing means for inhibiting image formation at the corner according to a command from the corner erasing selection mode means; and reading the corner erasing data stored in the memory means. and a corner erasing data changing means for changing the corner erasing data stored in the temporary memory means, and the corner erasing data changing means is provided with a command from the corner erasing mode selection means. A copying apparatus characterized in that the image formation preventing means is configured to prevent image formation at the corner based on the corner erasing data changed by the means. (10) a corner erasing mode selection means for selecting a corner erasing mode that prevents image formation at all four corners of a document to be copied; a memory means for storing corner erasing data; and the corner erasing mode selecting means 1. An image formation preventing means for preventing image formation at all four corners based on corner erasing data stored in accordance with a command from a copying apparatus. (11) Corner erasing mode selection means for selecting a mode for preventing image formation on at least one corner of a document to be copied; and a size change specification for specifying a change in the size of the area where image formation is to be prevented. and an image formation preventing means for preventing image formation at the corner based on corner erasing data specified by the size change specifying means. (12) Corner erasing mode selection means for selecting a mode for preventing image formation on at least one corner of a document to be copied; and a size change specification for specifying a change in the size of the area where image formation is to be prevented. and an image formation preventing means for preventing image formation at the corner based on corner erasing data specified by the size change specifying means in response to a command from the corner erasing mode selecting means, and preventing the image formation. A copy characterized in that the shape of the area is a triangle with two sides parallel to the sides of the original, and the change item of the size change designation means is the length of each of the two orthogonal sides of the triangle. Device. (13) A corner for abutment that is commonly used for each document, a document detection means for detecting the presence or absence of a corner of the document abutted against the corner for abutment, and a corner for abutment for the document that is abutted against the corner for abutment. An image formation preventing means for preventing image formation on the corner of the abutted document, and a control means for activating the image formation preventing means when the document detecting means confirms that there is no document at the abutting corner. A copying device characterized by: (14) An abutment corner commonly used for all originals, a rotatable document pressure plate that presses the document abutted against the abutment corner onto the contact glass, and an opening of the document pressure plate. a pressure plate rotation detection means for detecting the degree and direction of movement; a document detection means for detecting the presence or absence of a corner of the document abutted against the abutment corner; and a document detection means for detecting the presence or absence of a corner of the document abutted against the abutment corner; An image formation preventing means for preventing image formation at the corner, and the pressure plate rotation detecting means detecting that the document pressure plate is closed below a predetermined angle, and the document detecting means detects whether the document is placed at the abutment corner. and control means for confirming that there is no image formation preventing means and activating the image formation preventing means.