JPS6187185A - Copying device - Google Patents

Abstract

PURPOSE:To improve partial working property of copying by adhering a mark sheet for specifying an area to be copied in an original to an optional position of the original and forming a detecting means for recognizing the mark sheet and a control means for controlling copying operation for partial copying corre sponding to the specified area. CONSTITUTION:It is supposed to make parts P3-P4 of an original 2 blank without copying them. A mark sheet 20a indicating a pattern for the start of image formation disabling operation is adhered to the leading end of an unnecessary part and a mark sheet 20b indicating the pattern for the end of the image formation disabling operation is adhered to the final end of the unnec essary part. When the copying operation is started and the mark sheet 20a adhered to the original 2 is recognized by a detector, an erase lamp is turned on, all charge on a photosensitive body is completely erased and the same state as a blank picture is formed. When the pattern of the succeeding mark sheet 20b is recognized by the detector, the erase lamp is turned off and the electrostatic latent image of the original 2 is still formed on the photosensitive body as it is.

Description

[Detailed description of the invention] Technical field The present invention relates to a copying apparatus.

BACKGROUND OF THE INVENTION In general, when considering a copying operation, it is not always desirable to copy the entire surface of a document, but it is often desirable to copy only the portion excluding unnecessary portions.

Point 1: Usually, the methods of creating a secondary manuscript by cutting and pasting only the necessary parts of a manuscript, or of covering unnecessary parts with blank paper and copying them, are extremely time-consuming and troublesome.

On the other hand, since digital copying machines generally allow image editing, it is possible to make partial copies of only necessary parts. However, if you look at the method, once the original is scanned and memorized.

This is a tedious process, as it requires displaying the area on the display and specifying the area before actually copying the area.

However, even in analog copying machines, a device that made it possible to copy only the necessary parts was released in Japanese Patent Application Laid-Open No. 57-163.
This is disclosed in Japanese Patent No. 246.

This has a document table on the top for placing the document, and a slidable indicator with a pointer facing the document table to indicate the area of the document that corresponds to the area of the document indicated by this indicator. This device is equipped with a charging area regulating means that places charges only on the area of the photoreceptor surface. According to this, it is possible to efficiently detect an arbitrary section of a document and copy that section. However, when looking at the section specification method,
It must be specified by sliding the indicator with the document side facing down on the contact glass.
Whether or not the desired section has been set correctly cannot be determined until the actual copy results are seen. Also, the sections were initially set correctly.

Even so, there is an inconvenience that the document may shift due to wind pressure when the pressure plate for fixing the document is opened and closed, and the section to be read may also shift or slip. Furthermore, because the sections are set on the contact glass, it is not suitable for devices that are equipped with an ADF (automatic document feeder) or the like to automatically feed originals onto the contact glass.

the purpose The present invention was made in view of these points.

Regardless of whether it is a digital copy machine or a regular analog copy machine,
It is an object of the present invention to provide a copying device which can easily and accurately specify sections for partial copying and has good workability.

Structure In order to achieve the above object, the present invention provides a mark sheet that can be attached to any position of the original document to indicate the area to be copied in the original document, and the mark sheet affixed to the original document is used before or during the copying operation. The present invention is characterized in that a detecting means that can be recognized is provided, and a control means is provided for controlling the copying operation so as to perform a partial copy corresponding to the indicated area of the mark sheet detected by the detecting means.

Hereinafter, one embodiment of the present invention will be described based on the drawings. First, FIG. 2 schematically shows an ordinary analog copying machine, in which a document 2 is set on a contact glass 1 with its front end aligned with a reference position Po. And the copy button is O
When the copy operation is started, the first scanner 5, which includes the lamp 3 and the first mirror 4, moves to the reference position fi.
Starting from the home position on the right side of l Po, scan the original 2 in the direction of the arrow. At this time, the original image is exposed onto the photoreceptor 10 by an optical system consisting of mirrors 6, 7, 8 and lenses 9, and an electrostatic latent image is formed. This is because the photoreceptor 10 has already been uniformly charged by the charger 11. Thereafter, the electrostatic latent image is developed into a visible image by the developing device 12, and transferred to the transfer paper 13 fed at a predetermined timing by the action of the transfer charger 14. After this transfer charger 14 is separated from the photoreceptor 10 by a separation charger 15, it is sent to a fixing device (not shown) by a conveyor belt 16 and is discharged. On the other hand, the toner remaining on the photoconductor IO is cleaned and removed by the cleaning device 117, and the static electricity is eliminated by the static elimination charger 18. Here, an erase lamp 19 is provided between the image forming section and the developing device 12, and erases charges at the front and rear edges and both sides of the image other than the original image.

Now, for example, as shown in FIG. 1(, ), the document 2 is a blank page because I do not want to copy portions 13 to 24 from the leading edge P1 to the trailing edge P2 of the document 2. Consider the case where you want to set the state.

A mark sheet is provided for specifying such a section, and a mark sheet 20a with a pattern of 0, which is the start of no image formation, is pasted to the tip of the unnecessary portion.

A mark sheet 20b having a pattern of 0 indicating the end of non-imaging is attached to the rear end of the unnecessary portion. On the other hand, inside the copying machine, a detector 21 is provided integrally with the first scanner 5, facing the contact glass 1 and capable of optically recognizing the mark sheet 20.

In such a configuration, the operation when copying using the original 2 shown in FIG. 1(a) will be described. first,
The original 2 is set on the contact glass l so that the leading edge P1 of the original 2 coincides with the reference position Pa. Then, when the copy button is turned ON, the copy operation is started in the same manner as in the case described above. During this copying operation, when the detector 21 recognizes the O pattern on the mark sheet 20a pasted on the original 2, a signal to turn on the erase lamp 19 also in the original image area is output, and the erase lamp 19 turns on. do. As a result, the digit 1 of the manuscript 2
All charges on the photoreceptor 10 are erased from the portion corresponding to 9P3, resulting in the same state as a blank image. As scanning progresses further, the next mark sheet 20 is detected by the detector 21.
When the pattern b is recognized, erase lamp 1
The lighting signal 9 is canceled and the light goes out, and the electrostatic latent image of the original 2 remains formed on the photoreceptor 1O as at the beginning.

By controlling the copying operation based on the detection signal from the detector 21, the copying operation is performed except for the sections P3 to P4, that is, the transfer paper 13 is in a partial copy state on which a copy image is formed as shown in FIG. 1(b). is obtained.

In this way, according to the two embodiments, the operator can directly specify the section to be erased while looking at the document surface of the document 2 using the mark sheets 20a and 2Ob method, so that the range can be specified easily and accurately. Good workability for one part copy.

In this embodiment, an example has been described in which image formation is not performed in the section P3 to P4 of the document 2, but this section P3 to P4 is
It is clear that partial copying of only the sections P1 to P3, etc. can also be done in the same way. Further, although the erase lamp 19 is normally turned off and turned on during unnecessary image sections, it may be controlled so that it is turned on all the time and turned off during necessary image sections.

Further, in this embodiment, the mark sheets 20a and 20b are detected and controlled during the actual copying operation, that is, at the same time as image exposure, but prior to the actual copying operation, pre-scanning is performed and the mark sheets 20a,
The respective distances to 20b may be read in advance and the copy operation may be controlled based on this data. In particular, as will be described later, in the case of an ADF device or a 5ADF device that is superior to the ADF device, by reading the mark sheet while conveying the document toward the contact glass 1, it is possible to know the timing of erasing the image in advance, and the mark sheet A contact type detection means can also be used.

Furthermore, as a method for erasing images from unnecessary image sections.

In addition to the erase lamp 19 lighting method, there is also a method for turning off the charger 11 and a method for turning off the transfer charger 14.
F, a method of increasing the developing bias in the image device 12, or a combination of these methods.

In addition, when the detector 21 is installed over the entire width in the width direction, the mark sheet 20a is also used in the direction perpendicular to the scanning direction.
, 20b so that the lighting area of the erase lamp 19 can be controlled, as shown in FIG.
It is also possible to obtain a partial copy extracted from the original 2 as shown in FIG. 3(b). Conversely, if this part is required, a mark sheet 20c of a different pattern is attached to the document 2 as shown in FIG. It is also possible to extract a partial copy as shown in Figure (b).

Next, embodiments of a mark sheet and its detection means suitable for a copying machine equipped with an ADF device (or 5ADF device) will be described with reference to FIGS. 5 to 13. First, FIG. 5 schematically shows an ADF device, in which a document 2 is sent in by a feed roller 22, is further conveyed by a conveyor belt 23, and is stopped and set at a predetermined position on a contact glass l for copying. . Here, feed roller 2
A document detection sensor 24 for detecting the presence or absence of the document 2 is provided between the conveyance belt 23 and the document detection sensor 24 .

Therefore, the mark sheet 25 affixed to the original 2 is made of conductive material, and its color is, for example, white or a color that cannot be copied.

The reason why the mark sheet 25 is white is because characters, symbols, codes, etc. can be written on the mark sheet as necessary. In addition, this mark sheet 2 that can be attached to the original 2
5 has a shape with as few corners as possible, such as a circle, so that it is difficult to peel off. On the other hand, a contact type detection brush 26 is provided as a detection means for detecting such a conductive mark sheet 25. This detection brush 26 is.

As shown in FIG. 7, it has a sandwich structure consisting of a pressurizing leaf spring 27, an insulator 28 such as plastic, and an electrode 29 divided into two forks.

Here, the diameter of the mark sheet 25 is made sufficiently larger than the distance W between the electrodes 29a and 29b of the detection brush 26, as shown in FIG. Although such an electric current 29 may be brought into direct contact with the original 2, it is necessary to apply pressure to bring the detection brush 26 (electrode 29) into complete contact with the mark sheet 25 on the original 2. This pressure becomes a frictional force against the original 2, and it is difficult to maintain a balance with the paper passing performance of the original 2. Therefore, in this embodiment, an indirect contact method is adopted in which a conductive roller 30 is interposed between the document 2 and the detection brush 26, as shown in FIG. 9, in order to have a high contact pressure and improve paper passing performance. It is something. This conductive roller 30 is formed by providing conductive rubber 33a, 33btl-- which is divided into two by a non-conductive rubber 32 around an insulating bearing 31, corresponding to the electrodes 29a, 29b (see FIG. 10). Thereby, the presence or absence of the mark sheet 25 can be determined by the conductive rubbers 33a and 33b of the conductive roller 30.
It is detected by the current flowing between the electric currents 29a and 29b of the detection brush 26 through the electric current 29a and 29b of the detection brush 26. FIG. 11 shows a mark sheet sensor circuit 34 that includes a kind of switch made up of a mark sheet 25 and a conductive roller 30 (detection brush 26), and the signal is input to a hysteresis amplifier 35 through an integrator made of C and R for noise removal. This hysteresis amplifier 35 outputs mark sheet detection No. 18 as a 0.1 signal.

Here, as shown in FIG. 6, the conductive roller 30 and the detection brush 26 are installed at the ends of the document detection sensor 24 on the same straight line in a direction perpendicular to the document feeding direction. ing. This is the document detection sensor 24.
The mark sheet 25a, based on the detection of the leading edge of the document by
This is to read the pasting position of 25b. In addition, the mark sheet 25 is arranged in correspondence with the arrangement of the detection brush 26, etc.
a and 25b are also pasted on one side of the document 2.

Regarding the control system, as shown in FIG. 12, the paper presence/absence signal from the document detection sensor 24 and the mark sheet detection signal from the mark sheet sensor circuit 34 are input to the microprocessor unit 36. Further, a rotation signal of a constant period is inputted to the microprocessor unit 36 from a paper feed drive section 37 that rotates the feed roller 22. Based on these signals, the microprocessor unit 36 controls turning on and off the erase lamp 19.

In such a configuration, when the original 2 is fed onto the contact glass 1 (that is, before the actual copying operation), the original 2 is
The positions of mark sheets 25a and 25b relative to each other are detected. FIG. 13 is a timing chart showing this detection operation. That is, the position detection of the mark sheets 25a and 25b is performed by the paper feed drive unit 37 that drives the feed roller 22.
Using the rotation signal as a reference, the number of pulses of this rotation signal is counted from the time when the leading edge of the document is detected by the document detection sensor 24, and the counted value at the time when the mark sheets 25a and 25b are detected is stored. In other words, the count value in one section T1 indicates the position of the mark sheet 25a, and the count value in one section T2 indicates the position of the mark sheet 25b. In addition.

When the document detection sensor 24 and the detection brush 26 are not on the same line but are located back and forth in the feeding direction.

It is only necessary to correct the count value by the distance.

In parallel with this detection operation, document feeding continues.
The original 2 is set at a predetermined position on the contact glass l, and the copying operation is actually started.

At this time, the erase lamp 19 is
is controlled and a partial copy is made. For example, when the copying operation advances to the position corresponding to the mark sheet 25a, the copying operation is performed according to the count value detected in advance.

At that point, the erase lamp 19 is turned on, and the photoreceptor 10
All charges on the top are erased, leaving the image in the same state as a blank image.

When such an operation continues until the position corresponding to the mark sheet 25b is reached, the erase lamp 19 is controlled to be turned off again, and the normal image forming operation is resumed.

As a result, as shown in FIGS. 1(a) and 1(b), partial copying is performed without copying between the mark sheets 25a and 25b. Of course, on the contrary, the erase lamp 19 may be turned on from the beginning and turned off between the mark sheets 25a and 25b, so that a partial copy between the mark sheets 25a and 25b can be obtained. In this method, the first mark sheet 2
In order to align the position of 5a (the first position to be actually copied) with the position of the leading edge of the image on the photoreceptor lO, the partial copy is transferred by advancing the optical system by a distance corresponding to the count value of the mark sheet 25a. It may also be formed at the tip of the paper 13. Alternatively, instead of the advance method using the optical system, the same effect can be achieved by changing the transfer position by changing the registration of the transfer paper 13. Also, the former mark sheet 25a.

In the method of erasing between the mark sheets 25b, by changing the scanning speed of the optical system for scanning between the mark sheets 25a and 25b, a partial copy may be made on the transfer paper 13 in a state different from the actual interval between the mark sheets 25a and 25b. If the optical system is made faster, the erase interval will be shorter and the image will be reproduced, and if the optical system is made slower, the erase interval will be longer and the image will be reproduced.

In this way, according to the conductive mark sheet 25 method,
Since a contact type detection means can be used, it can be effectively used in devices equipped with a document feeding mechanism such as an ADF device. As a result, the timing at which the image should be erased can be known in advance, making erase control easier. In addition, the mark sheet 25 method makes it easy and accurate to specify the erase section, and especially for those equipped with an ADF device, the mark sheet 25 can be affixed to each document in advance and stacked, so even partial copies can be made easily. Continuous processing can be performed that takes advantage of the features of the ADF device.

Next, embodiments of a non-contact mark sheet using magnetism and its detection means will be described with reference to FIGS. 14 to 20. First, the copying apparatus shown in FIG. 14 is basically the same as that shown in FIG. 2, and the same parts are designated by the same reference numerals.

In this embodiment, the first scanner 5 includes a detector 21.
Instead, a magnetic sensor 38 is mounted to face the contact glass l. In other words.

The detection area of this magnetic sensor 38 is the contact glass 1
In addition, the position is set at a position preceding the reading of the document by the lamp 3 or the like. However,
The mark sheet 39 affixed to the original 2 is made of a magnetic material, and its color is white or the same color as the background of the original 2.

Such mark sheets 39a, 3'9b are, for example, the first
As shown in FIG. 4(a), these are pasted at both ends of the portion of the original 2 to be copied.

A mark sheet 39a from such a magnetic sensor 38
, 39b controls the copying operation, and a block diagram thereof is shown in FIG. First, a sensor signal from the magnetic sensor 38 is input to a control section 41 via a comparator 40. This control section 41 also receives a signal from a scanner position detection section 42 that detects the position of the first scanner 5 and the like. Based on these signals, the control unit 41 controls the erase lamp 19, the paper feed unit 44, the charging power source 45, etc. via the driver 43, and performs selective copying, partial enlargement copying, etc. of arbitrary sections of the original 2. It is.

In this configuration, Figure 15 (,) is now displayed in manuscript 2.
The operation of pasting the mark sheets 39a and 39b as shown in FIG. 17 and extracting and partially copying only the images between the mark sheets 39a and 39b will be described with reference to the flowchart of FIG.

First, when copying starts, it is first checked whether sampling copy mode is specified, and if it is not specified, normal copying operation is performed.

On the other hand, if the sample copy mode is selected, the erase lamp 19
The first scanner 5 and the like will start scanning with the light on. As a result, the charge on the photoreceptor 10 charged by the charger 11 is removed by lighting the erase lamp 19, so that no latent image is formed as in the case of a blank image. The scanning progresses and the magnetic sensor 38
When the first mark sheet 39a is detected, a timer is started to correct the time difference between the detection signal of the magnetic sensor 38 and the reflected light of the document irradiated onto the photoreceptor 10. When this timer times up, the erase lamp 19 is switched off. As a result, the charge on the photoreceptor 10 is not removed by the erase lamp 19, and the formation of a latent image by the light reflected from the original begins as usual.

When the scanning progresses further and the second mark sheet 39b is detected by the magnetic sensor 38, the time difference is corrected by the timer as in the case described above, and then the erase lamp 1 is turned on again.
9 is turned on and no latent image is formed. In this way, as shown in FIG. 15(b), the mark sheet 3
9a and 39b, a partial copy of only the image of section 1 specified for sampling is obtained.

Here, as shown in FIG. 18, the magnetic sensor 38 can be constructed of a sensor whose magnetic flux of a detection coil changes depending on the presence of a mark sheet 39 made of a magnetic material. In this figure, a magnetic core 46 made of ferrite having an opening in the direction of the contact glass 1 is provided.
An excitation coil 47 and a detection feedback coil 48 are wound around the coil 6 . Further, the magnetic core 46 is provided at a distance 1111g where the magnetic flux Φ emitted from the magnetic core 46 flows through the contact glass 1 and the original 2 by fringing.

The magnetic sensor 38 having the structure shown in FIG. 18 is connected to a blocking oscillation circuit 49 as shown in FIG. The output of this blocking oscillation circuit 49 is the comparator 4
It is entered as 0. In this blocking oscillation circuit 49, when a voltage is applied to the starting resistor R1 by the power supply v1, a current flows to the base of the one-oscillation transistor Tr, and this transistor Tr is turned on. As a result, current flows through the exciting coil 47 and the magnetic core 46 is excited.

On the other hand, the voltage induced in the feedback coil 48 wound around the magnetic core 46 is input to the base of the transistor Tr via the resistor R2 and the capacitor Ct, so that the excitation current flowing through the transistor Tr increases. As a result, the induced voltage in the feedback coil 48 also increases further, and when the magnetic core 46 is saturated, the polarity of the induced voltage in the feedback coil 48 is reversed and the transistor Tr is turned off. Then, when the magnetic core 46 is reset, the transistor T' is turned on again.
The series of operations described above are repeated to continue oscillation. The current flowing through the transistor Tr due to such an oscillation operation is taken out as a voltage by the resistor R3, input to the comparator 40, and compared with the reference voltage v2. here,
As shown in FIG. 18, the magnetic core 46 used has an air gap magnetic path (air gap). As a result, when the magnetic flux in the air gap of the magnetic core 46 crosses the mark sheet 39 made of magnetic material, the magnetic permeability of the magnetic loop changes, and the saturation magnetic flux density of the magnetic core 46 changes accordingly.
Furthermore, the presence or absence of the mark sheet 39 is detected by utilizing the changes in the oscillation frequency of the blocking oscillation circuit 49 and the current flowing through the resistor R3.

As shown in FIG. 20, a mark sheet 50 made of a magnetized hard magnetic material is used.

Reed switch 51 whose contacts are opened and closed by the magnetic flux Φ
may be used as a magnetic sensor.

Further, although these embodiments have been explained using an analog type copying machine, it is obvious that the present invention can be similarly applied to a digital copying machine (including a facsimile machine, an image data collection device, etc.).

Effects Since the present invention is configured as described above, the area to be partially copied can be easily and accurately specified using the mark sheet method while actually looking at the original surface of the original, thereby improving the work efficiency of partial copying. It is something that can be done.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of the present invention, and FIG. 1 is a plan view of an original and transfer paper. FIG. 2 is a schematic side view of the copying apparatus, FIGS. 3 and 4 are plan views of the original and transfer paper, and FIGS. 5 to 13 show a second embodiment of the present invention. The figure is a side view, FIG. 6 is a plan view of the document, FIG. 7 is a sectional view of the detection brush, FIG. 8 is a plan view, FIG. 9 is a perspective view, FIG. 1O is a sectional view of the conductive roller, and FIG. 11 is a sensor circuit diagram, FIG. 12 is a block diagram, FIG. 13 is a timing chart, and FIGS. 14 to 20 show a third embodiment of the present invention.
15 is a schematic side view of the copying device, FIG. 16 is a block diagram, FIG. 17 is a flowchart, and FIG. 18 is a side view showing the configuration of a magnetic sensor.
FIG. 19 is a circuit diagram, and FIG. 20 is a side view. 2... Original, 20... Mark sheet, 21... Detector (detection means), 25... Mark sheet, 26...
・Detection brush (detection means), 38...magnetic sensor (
Detection means), 39... Mark sheet, 50... Reed switch (detection means) Applicant Ricoh Co., Ltd. Figure J, 3 (a) u (a) Country (b) Country (b) March Figure 3.17 Figure 3 "3 Figure 1 Other countries Ichiatsu" 5 Country Otsu "j

Claims (1)

[Claims] A mark sheet indicating an area to be copied in a document is provided so as to be affixed at any position on the document, and a detecting means is provided which can recognize the mark sheet affixed to the document prior to or during a copying operation, and this detecting means is provided. 1. A copying apparatus comprising: a control means for controlling a copying operation so as to perform a partial copy corresponding to a specified area of a mark sheet detected by a copying apparatus.