JPH01318460A - Original carrying device - Google Patents

Abstract

PURPOSE:To surely prevent the back copy of a 2-sided original by using a 2-sided original setting means and a density changing means which gives an instruction to a picture processor to change the reference of density for the original reading process or the picture output process based on the input signal of the original setting means. CONSTITUTION:A control part 300 of an original carrying device contains a density changing means 301. The means 301 is programmed so that it outputs a changing instruction to a control part 400 of a copying machine for the reference of density for the original reading process of an original reading part or for the copy process of a copy part based on the input signal sent from a 2-sided original setting button 4. As a result, the back copy can be avoided even with a 2-sided original. That is, both the reading and printing densities of the copying machine are changed to the densities for copy of a 2-sided original when this 2-sided original is once set. Then the density level is lowered so as to avoid the 'back copying'.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial field of application The present invention is used to connect to an image processing device such as a copying machine, facsimile machine, image league or scanner, and to feed a document to the device or the like. The present invention relates to a document conveying device that ejects a processed document from the device.

(b) Conventional technology In recent years, image processing devices such as copying machines (hereinafter, for convenience of explanation,
This will be explained using a copying machine as an example. ) Automation has been making great progress. In particular, document transport devices configured to automatically place a document on the platen of a copying machine have become commonplace.

On the other hand, there are many copying machines that are capable of double-sided copying, and there are increasing opportunities for double-sided originals that are copied by double-sided copying machines and have images on both the front and back sides to be passed through the document transport device. In particular, in a document conveying device having a mechanism for reversing documents, double-sided documents are often passed through.

Conventionally, when a double-sided document is passed through a document conveying device, once the density is set, both the double-sided document and the single-sided document are processed with the same density. Furthermore, even when automatic density adjustment W (AEI) is used, the density of single-sided originals and double-sided originals is adjusted in the same mode.

←1 Problems to be solved by the invention By the way, in the case of double-sided originals, the thickness of the original is thin,
When the transparency of the document is high or the density of the document is extremely high, there is a drawback that so-called "show-through" occurs in which even the content on the back side of the document is transmitted to the front side and duplicated.

In this case, the user has to set the density again, which takes time and effort, and many defective copies occur.

In addition, when single-sided or double-sided originals are irregularly mixed17, the user has to adjust the density each time, which is not only cumbersome (but also defeats the original purpose of automation). There is a risk of it being damaged.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a configuration for changing the processing density standard for a double-sided original when the double-sided original is transported, thereby solving the above-mentioned problems.

(b) Means for Solving the Problems The present invention has been made in view of the above-mentioned circumstances. For example, as shown with reference to FIGS. Connect to the image processing device (2) to output,
The original (M) is placed at the original reading position (
In the document transport device (1), which transports the document to the document reading position (3) and discharges the document from the document reading position (3),
), the image processing device (2
), and a density changing means (301) for outputting an output to change the density standard for document reading processing or the density standard for image output processing of the image forming processing device (2). be.

Further, the double-sided document setting means (4) may be arranged in the image processing device (2).

It is also connected to an image processing device (2) that reads and outputs the image of the document (M), and the document (M) is transferred to the image processing device (2).
In a document transport device (1) that transports a document to a document reading position (3) and discharges the document from the document reading position (3),
Based on the double-sided document detection means (101) that detects a double-sided document having images on both the front and back sides when conveying the document (M) to the document reading position (3), and the double-sided document detection means (101) that detects the double-sided document. density changing means () for outputting to the image processing device (2) a density standard for document reading processing or a density standard for image output processing of the image processing device (2);
301).

In addition, in order to eliminate the density difference between a single-sided original and a double-sided original, a thickness detection means (2) is provided for detecting the thickness of the original when the original fi (M) is conveyed to the original reading position (3).
00), and if the thickness of the document is greater than a predetermined thickness, the density reference change may not be output.

Similarly, in order to eliminate density differences, the document reading position (
3) comprises a transparency detection means (110) for detecting the transparency of the original (M) when conveying the original (M), and does not output a change in the density standard when the transparency of the original is more than a predetermined value. You can do it like this.

(e) Effect Based on the above-described configuration, when the double-sided document setting means (4) is inputted when the document (M) is conveyed to the document reading position (3) of the image processing device (2), the double-sided document Setting means (4
) is output from the density changing means (301) to the image processing device (2) to change the density standard for document reading processing or the density standard for image output processing, for example, the standard for close-up density. The density standard for document reading processing or the density standard for image output processing in the image processing device (2) is changed so that show-through will not occur even if the document is double-sided.

The double-sided document setting means (4) is the image processing device (2).
The same applies even if it is placed in

Furthermore, when equipped with a double-sided document detection means (101),
The original (M) is at the original reading position (3) of the image processing device (2).
), if it is detected that the document is a double-sided document, the document is sent from the density changing device (301) to the image processing device (2) in the same way as described above based on the double-sided document detection by the double-sided document detecting device (101). The density standard for document reading processing or the density standard for image output processing is output to be changed, and the density standard for document reading processing or image output processing in the image processing device (2) is a double-sided document. will also be changed to prevent bleed-through.

Moreover, the thickness detection means (200) or the transparency detection means (
110), the thickness or transparency of the original (Ml) to be transported to the original reading position (3) is detected, and the original (Ml) is detected.
) is above the specified thickness, or when the transparency is above the specified value, there is no risk of show-through even in double-sided originals, so the change in the density standard is not output, and the difference in density between single-sided and double-sided originals is not output. occurrence is avoided.

Note that the above symbols are shown for reference and do not limit the configuration in any way.

(F) Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 shows a document conveying device 1 to which the present invention is applied to a copying machine 2.
FIG. The document conveyance device 1 includes a mechanism for reversing the front and back of the document.

As shown in FIG. 2, the document conveyance device 1 is disposed above the copying machine 2 and has a full-surface belt wound around a driving roller 5 and a driven roller 6 facing the platen 3 of the copying machine 2. 7. One end of a shaft 32a of a motor 32 is connected to the shaft 5a of the drive roller 5, and a clock disk 33 is fixed to the other end of the shaft 32a.

A photointerrupter 35 is arranged close to the clock disk 33. The photo interrupter 35 is a clock disk,
The moving amount of the entire belt 7 is controlled by changing the number of 33 slits. And belt 7
In the upper main body 9 of the apparatus, there is disposed a paper discharge tray 10 for receiving and taking out processed documents.

The paper feed tray 11 is rotatably attached around a hinge 100. By rotating the paper feed tray 11 in the direction of the arrow, the document on the discharge 1-ray 10 can be easily taken out.

When the document conveyance device 1 is used, a discharge roller 27 is provided to discharge the document M conveyed by the full-surface belt 7. A pair of bending guides 2 is provided downstream of the entire belt 7.
9 are arranged.

Further, on the left side of the paper feed tray 11, there is a paper feed roller 13 that feeds the original 815M placed on the paper feed tray 11 one sheet at a time from the lowest position, and a paper feed roller 13 that rotates counterclockwise to convey the original M. Conveyor bell I-15 rotates counterclockwise to transport document M 1
A separation belt 16 that separates sheets one by one, a pair of transport rollers 17 that transports the original document M, and a sensor 36 that detects the leading and trailing ends of the original wIM are provided. This constitutes a feeding path 19 for feeding the document M onto the platen 3. A reversing path 20 for reversing the document M is connected to the feeding path 19 . The reversing path 20 is provided with a reversing roller 21 , a large reversing roller 22 , and a reversing roller 23 .

Then, when the paper feed tray 11 is closed and a star 1 key (not shown) of the copying machine 2 is pressed, the paper feed roller 13 starts rotating and feeds the document M from the lowest position. The document M is separated and conveyed from the bottom one by one by the conveyor belt 15 and the separation bell ←16, and further, the document M is held and conveyed by a pair of conveyance rollers 17 and is placed between the entire surface belt 7 and the platen 3. inserted. Next, as the belt 7 rotates, the document M is placed on the document placement reference 37 on the platen 3, and is copied by a copying section (not shown) of the copying machine 2. After copying, the document M is conveyed to the right by the full-surface belt 7 that is rotated by the driving of the drive roller 5, passes through a pair of bending guides 29, is held between a pair of paper discharge rollers 27, and is discharged onto a paper discharge tray 10. Ru.

Furthermore, when the duplex copying mode is set in the copying machine 2, after the copying of one side of the original M is completed in the same manner as in the single-sided copying mode described above, the original M is conveyed to the left by the full-surface belt 7, and is transported to the reversing path. 20. Furthermore, manuscript M
For example, it is held in the reversing path 20 by the reversing roller 21 and the large reversing roller 22 and the large reversing roller 22 and the reversing roller 23 and is conveyed to the conveying roller pair 17, and then conveyed to the conveying roller pair 17.
7 and inserted between the entire surface belt 7 and the platen 3.

The document M is placed with the uncopied side facing down on the document placement reference 37 on the platen 3 by the full-surface belt 7, and is copied by a copying section (not shown) of the copying machine 2. Then,
The original M, which has been copied on both sides, is conveyed to the right by the full-surface belt 7, passes through a pair of bending guides 29, is held by the paper ejection rollers 27, and is ejected onto the ejection sheets 1 to 10, thereby causing the original M Double-sided copying is completed.

On the other hand, when the document is a double-sided document, the document conveyance device 1
It is configured to output to the copying machine 2 in order to change the a-degree standard for processing double-sided originals, and the double-sided original detection means will be described below.

<When equipped with a double-sided original setting means> A double-sided original setting button 4 constituting a double-sided original setting means is arranged in the copying machine 2 or the original transport device 1. This button is pressed when transporting a double-sided original having a double-sided original, or when copying a double-sided original. In addition, the control unit 300 of the document conveying device 1 includes:
Density changing means 301 is provided, and the density changing means 301 sends a message to the control section 400 of the copying machine 2 based on an input signal from the double-sided document setting button 4, so that the copying machine 2 changes the original in its original reading section. It is programmed to change the density standard for reading processing or the density standard for copying processing in the copying unit so that it will not show through even if it is a double-sided original, and to output it. Then, when the user presses the button 4 and then presses the start key, the original M
is placed on the platen 3, and reading processing is performed.

However, since the double-sided original setting has been made, the reading and printing density of the copying machine 2 has been changed to the double-sided original density.

That is, the density is changed to a low value to prevent "bleed-through" from occurring. Specifically, you can increase the light intensity of the optical system lamp in the document reading section of the copying machine 2, lower the primary charging voltage of the photosensitive 1-ram in the copying section, or increase the slice level in the case of a digital copying machine. lower.

The double-sided original setting button 4 is effective not only for double-sided copying of a double-sided original, but also for single-sided copying of a double-sided original.

In this case, it is preferable to use the original m conveyance device which is not equipped with a front-back reversing mechanism.

In addition, by linking this double-sided original setting button 4 with the mode specification of double-sided original → double-sided copy or double-sided original → single-sided copy of the copying machine 2, the density of the double-sided original is always changed when the double-sided original is transported. It is in good condition. In this case, the document transport device is limited to a document conveying device equipped with a front-back reversing mechanism.

Case in which double-sided document detection means is provided> As shown in FIG. Automatically detects whether it is single-sided or single-sided. The sensor 101 is provided near the original path line near the pair of transport rollers 17,
The back side of the passing document M is monitored j7, and it is determined whether or not it is a double-sided document.

In other words, in the case of a single-sided original, the back side is pure white, so the output of the sensor 101 does not fluctuate (see FIG. 4 [al.
reference). In addition, in the case of a double-sided document, since there is information on the back side as well, the output of the sensor 101 fluctuates (see Fig. 4).
b) #sho). Then, when a double-sided document is detected, based on the detection of the double-sided document, the density changing unit 301 outputs an output to the control unit 400 of the copying machine to lower the density standard for document processing in the same manner as described above. Furthermore, when the original is one-sided, the density standard is not changed.

When equipped with a document thickness or transparency detecting means As shown in FIG. It is placed on the document standard side in the same width direction. The reason for this is that the edges (side edges) of the document are hidden by other areas and have less noise.

The sensor 110 is a transmission type sensor that detects the transparency of the document passing through the pass line, and determines whether the document is likely to be "bleed through" or vice versa. For example, the fifth
As shown in the figure, the output voltage of the sensor 110 is at level V when there is no document, compared to the reference level 8. , thin paper (
For example, when the paper weight is 52.3 g/m2), the level is vH1, and when the thickness is 104 g/m2, the level is V. When the level is higher than the reference level v6, it is determined that "bleed-through" is likely to occur.

A case will be described in which the above-described double-sided image detection sensor 101 and the transparency detection sensor 110 are combined.

First, the sensor 10 determines whether the document is double-sided or single-sided. If it is a single-sided original, the density is not changed and processing is performed as before. In the case of a double-sided original, the sensor 110
If the output level of V8 is lower than the reference level V8, the density is not changed because the document is unlikely to cause "bleed-through". On the other hand, if it is higher than the standard level ■8, the original is prone to "bleed-through" and the density should be changed (see Figure 8 [
c1). Therefore, the density changing unit 301 outputs the image to the control unit 400 of the copying machine in order to change the density.

In the case of double-sided originals with extremely high transparency or thin originals, even the above-mentioned density change may not be able to cope with the problem.

In such a case, the processing may be stopped and controlled to prevent copy mistakes.

The double-sided setting means and the transparency detection sensor 110 may be combined.

Further, the document thickness detecting means 200 can be used instead of the transparency detecting means 110. For example, as shown in FIG.
, 17 b, auxiliary plate 201, spring 204, sensor 2
It comes from 03. This thickness detection means 200 is provided in association with the above-mentioned pair of conveyance rollers 17 (see FIG. 2).

The lower end of the auxiliary plate 201 is rotatably supported around a pin 2.02, and the driven-side conveyance roller 17b is rotatably attached between the two. Conveyance roller 17a
The roller 17b is pressed against the roller 17b. A flag portion 2° 1a is provided at the upper end of the auxiliary plate 201 to allow entry and exit into the sensor 203.

When a thick original passes between the pair of transport rollers 17a and 17b, the flag 20 of the auxiliary plate 201
1a moves further to the left in the drawing and largely blocks the sensor 203, reducing the output of the sensor 203 (see FIG. 7). Also, when a thin document passes, the sensor 20
The output of 3 is higher than that of cardboard. In this way, the thickness of the document is detected.

Concentration control based on the detection results is the same as described above.

The original thickness detection means 200 and the double-sided original detection means 101 or the double-sided original setting means 4 can also be combined.

In this case as well, the same control as described above is performed.

Although the document conveying device 1 disposed in the copying machine 2 has been described, the copying machine 2 may be replaced by a paper feeder, a fax machine, a league or a scanner that only reads documents.

(G) As described in detail, according to the present invention, the double-sided document setting means and the density standard for document reading processing or image output processing to the image processing device are changed based on the input signal of the setting means. Since the document feeder is equipped with a density changing means that outputs an output to change the density standard for document reading by the image processing device or image output processing when the document to be transported is a double-sided document, the document feeder It is possible to reliably prevent bleed-through on a double-sided document being transported, and to automatically perform good image processing without bleed-through on the document.

Further, even if the double-sided document setting means is disposed in the image processing apparatus, the same effect as described above can be obtained.

Furthermore, the above-mentioned effects can also be obtained by an invention that includes a double-sided document detecting device instead of the double-sided document setting device.

Furthermore, if a thickness detection means or a transparency detection means is provided, it is possible to stop outputting to change the density standard when the thickness or transparency of the original exceeds a predetermined value, and to change the density standard between single-sided and double-sided originals. It is possible to avoid the occurrence of a density difference in image processing between the two cases.

[Brief explanation of the drawing]

FIG. 1 is a control circuit diagram according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of a document conveying device according to an embodiment of the present invention, and FIG. 3 is a diagram showing the arrangement positions of a double-sided document detection sensor and a transparency detection sensor. FIG. 4 is a diagram showing the output of the double-sided document detection sensor, FIG. 5 is a diagram showing the output of the transparency detection sensor, FIG. 6 is a side view showing the configuration of the thickness detection sensor, and FIG. The diagram showing the output, FIG. 8, is flowchart 1. 1 Original transport device, 2 Image processing device (copying machine)
, 3 Original reading position (platen), 4 Double-sided original setting means (Double-sided original setting button), 101 Double-sided original detection means (reflective sensor), 110 - Original transparency detection means (transparency detection sensor), 200 Original thickness detection Means, 301 Density changing means, M Original
. Figure 4 (a) (b)

Claims (1)

[Scope of Claims] 1. A document conveyor that is connected to an image processing device that reads and outputs an image of a document, transports the document to a document reading position of the image processing device, and discharges the document from the document reading position. In the apparatus, a double-sided document setting device performs an input operation when conveying a double-sided document having images on both the front and back sides to the document reading position; and a double-sided document setting device that inputs the image to the image processing device based on an input signal from the double-sided document setting device. A document conveying device comprising: a density changing unit configured to output a density standard for document reading processing or a density standard for image output processing of a forming processing device. 2. The document conveying device according to claim 1, wherein the double-sided document setting means is arranged in the image processing device. 3. In a document conveying device connected to an image processing device that reads and outputs an image of a document, and conveying the document to a document reading position of the image processing device and ejecting the document from the document reading position, the document reading device a double-sided document detecting means for detecting a double-sided document having images on both the front and back sides when the document is transported to a position; A document conveying device comprising: density changing means for outputting to change a density standard for document reading processing or a density standard for image output processing. 4. The apparatus is characterized by comprising a thickness detection means for detecting the thickness of the original when the original is conveyed to the original reading position, and does not output a change in the density standard when the thickness of the original is more than a predetermined thickness. The document conveying device according to claim 1, 2 or 3. 5. The apparatus is characterized by comprising a transparency detection means for detecting the transparency of the original when the original is transported to the original reading position, and does not output a change in the density standard when the transparency of the original is more than a predetermined value. The document conveying device according to claim 1, 2 or 3.