JPH07191420A - Document size detection device for image processing device - Google Patents

Abstract

PURPOSE:To detect original size by neither taking much detecting time nor requiring many detectors. CONSTITUTION:This device is provided with a first carriage 411 optically scanning an original D placed on an original platen 2. Two detectors 44 and 45 are provided at positions whose phases are mutually shifted in a scanning direction on the carriage 411. When the automatic detection mode of the original size is selected, the carriage 411 is moved to the prescribed position and the size of the original placed on the platen 2 is decided according to the detected results of two detectors 44 and 45 in a state where the carriage 411 is moved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image processing apparatus such as a copying machine having a document size detecting function for detecting a document size.

The present invention relates to a document size detecting device of an image processing apparatus for detecting the size of a document placed on a document placing table of an image processing apparatus such as a copying machine for copying a document image.

[0003]

2. Description of the Related Art Conventionally, the following method has been used to detect the size of a document placed on a document table glass as a document table of a copying machine or the like.

First method: Two detection sensors are provided on a scanning carriage for scanning an original, and the scanning carriage is moved to detect the size of the original.

In this method, the two detection sensors are mounted side by side in the direction perpendicular to the scanning direction.

Second method: A detection sensor is fixedly provided on the optical system unit to detect the size of the document.

However, in the case of the first method, it takes time from the time when the document is placed on the platen glass until the scanning carriage moves and the size of the document is detected, so that the operability is poor. was there.

Also, in the case of the second method, the A size series,
A large number of sensors are required to detect the paper sizes of various types of originals in the JIS (Japanese Industrial Standard) size series such as the B size series, and moreover, the letter size (L
For the purpose of using T (legal size) and leisure size (LD) series paper, the mounting position of the sensor had to be changed.

Further, it is impossible to detect the paper size of the specified size used only by the specified user.

[0010]

SUMMARY OF THE INVENTION The present invention eliminates the drawbacks such as detection time required and a large number of detectors as described above. An object of the present invention is to provide a document size detection device for an image processing device that does not require a detector.

[0011]

A document size detecting device for an image processing apparatus according to the present invention comprises a scanning means for optically scanning a document placed on a document table, wherein the scanning direction is provided on the scanning means. , Two detection means provided at positions that are out of phase with each other, a selection means for selecting an automatic detection mode of the document size, and the scanning means is moved to a predetermined position when the automatic detection mode is selected by this selection means. A moving means for moving the scanning means to a predetermined position by the moving means, and a judging means for judging the size of the original placed on the original table according to the detection results of the two detecting means. Has been done.

The document size detecting device of the image processing apparatus according to the present invention has a scanning means for optically scanning a document placed on a document table, and the scanning means has the phases shifted from each other in the scanning direction. Two first provided in position
Detecting means, at least one second detecting means fixed to the lower part of the original table, selecting means for selecting an automatic detection mode of the original size, when the automatic detecting mode is selected by the selecting means. A moving means for moving the scanning means to a predetermined position, and the document table according to the detection results of the first and second detecting means in a state where the moving means moves the scanning means to the predetermined position. It is composed of a determination means for determining the size of the document placed on the.

The document size detecting device of the image processing apparatus according to the present invention has a scanning means for optically scanning a document placed on a document table, and the scanning means has the phases shifted from each other in the scanning direction. Two detection means provided at the position, a selection means for selecting the automatic detection mode of the document size, and when the selection means selects the automatic detection mode,
Moving means for moving the scanning means to a predetermined position, in a state where the scanning means is moved to a predetermined position by the moving means,
Depending on the detection results of the two detection means, the determination means for determining the size of the original placed on the original table, the instruction means for instructing to change the predetermined position of the scanning means, and the instruction of the instruction means And a changing means for changing the predetermined position of the scanning means.

The document size detecting device of the image processing apparatus of the present invention has a scanning means for optically scanning a document placed on a document table, and the scanning means has a phase shifted from each other in the scanning direction. Two detection means provided at the position, a selection means for selecting the automatic detection mode of the document size, and when the selection means selects the automatic detection mode,
Moving means for moving the scanning means to a predetermined position, in a state where the scanning means is moved to a predetermined position by the moving means,
A determination unit that determines the size of a document placed on the document table according to the detection results of the two detection units, a storage unit that stores a plurality of predetermined positions of the scanning unit, and a predetermined position of the scanning unit. And changing means for selectively changing to a predetermined position of the scanning means stored in the storage means in response to an instruction from the instruction means.

[0015]

According to the present invention, in the above-described structure, the scanning means for optically scanning the original placed on the original table is provided, and the scanning means is provided at a position shifted in phase from each other in the scanning direction. Two scanning means are provided, and when the automatic detection mode of the document size is selected, the scanning means is moved to a predetermined position, and in this moved state, the document is detected according to the detection results of the two detection means. The size of the original placed on the table is determined.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows the external appearance of a copying machine as an image forming apparatus of the present invention, and FIG. 3 shows the internal structure of the copying machine. That is, 1 is the main body of the copying machine,
A document table (transparent glass) 2 that supports the document D is fixed to the upper surface of the main body 1. This is the document platen 2 fixed scale 2 ₁ is provided as a set reference document D, further, in the vicinity of the document table 2 document cover 1 ₁ openably are provided.

The document D placed on the document table 2 is
The scanning system including the exposure lamp 4, the mirrors 5, 6, and 7 reciprocates in the direction of the arrow a along the lower surface of the document table 2, so that the exposure scanning is performed during the reciprocation.
In this case, the mirrors 6 and 7 move at half the speed of the mirror 5 so as to maintain the optical path length.

The reflected light from the original D by the scanning of the scanning system, that is, the reflected light from the original D by the light irradiation of the exposure lamp 4 is reflected by the mirrors 5, 6, 7 and then,
Through the zooming _lenses block 8, further Mira -9 _1,
It is reflected by 9 ₂ and 9 ₃ and guided to the photoconductor drum 10 so that the image of the document is formed on the surface of the photoconductor drum 10.

[0020] The exposure lamp 4, a mirror 5, 6, 7, zoom lens block 8, the optical system 3 is constituted by a mirror -9 _1, 9 _2, 9 _3.

The exposure lamp 4 and the mirror 5 are provided on the first carriage 41 ₁ , the mirrors 6 and 7 are provided on the second carriage 41 ₂ , and the mirrors 9 ₁ and 9 ₂ are provided on the third carriage 41 _3. There is.

The magnification changing lens block 8 is moved by a magnification changing mechanism (not shown) to change the magnification (enlargement ratio, reduction ratio), and the minimum unit that can be set is 1.
%.

The photoconductor drum 10 rotates in the direction of the arrow b in the figure, and the surface is first charged by the charging charger 11, and then the image is slit-exposed at the exposure section Ph to electrostatically charge the surface. A latent image is formed. The electrostatic latent image is visualized by the toner attached by the developing device 12. The developing device 12 is detachable from the copying machine main body 1.

On the other hand, the paper (image forming medium) is fed from the selected upper feed cassette 13 ₁ or lower feed cassette 13 ₂ to the feed rollers 14 ₁ and 14 ₂ and the roller pair 1.
The sheets are taken out one by one by 5 ₁ and 15 ₂ and guided to the registration roller pair 17 through the paper guide paths 16 ₁ and 16 _{2, and} are guided to the transfer portion by the registration roller pair 17. Here, the paper feed cassette 13
₁ , 13 ₂ are detachably provided on the lower right end of the main body 1, and either one of them can be selected on an operation panel described later.

Further, each of the above-mentioned paper feed cassettes 13 ₁ and 13 ₂
Are cassette size detection switches 50 ₁ and 50, respectively.
₂ detects the cassette size. The cassette size detection switches 50 ₁ and 50 ₂ are composed of a plurality of micro switches that are turned on / off according to the insertion of cassettes of different sizes. Further, a manual feed guide 13a is provided on the upper surface of the paper feed cassette 13 ₁ , and a sheet manually inserted through the manual feed guide 13a is guided to the roller pair 15 ₁ by a delivery roller 14a. After that, the sheet is conveyed similarly to the sheet fed from the sheet feeding cassette 13 ₁ .

On the other hand, the sheet sent to the transfer portion is brought into close contact with the surface of the photoconductor drum 10 at the transfer charger 18, so that the toner image on the photoconductor drum 10 is formed by the action of the charger 18. Transcribed. The transferred sheet P is electrostatically peeled from the photosensitive drum 10 by the action of the peeling charger 19, is conveyed by the conveying belt 20, and is sent to the fixing device 21 provided at the end portion thereof. The transferred image is fixed by passing through.

Then, the sheet after fixing is sent to a pair of delivery rollers 2.
2 is discharged to the tray 25 outside the main body 1. After the transfer, the photosensitive drum 10 is returned to the initial state by removing the residual toner on the surface by the cleaner 26 and erasing the residual image by the charge eliminating lamp 27.

Reference numeral 29 is a cooling fan for preventing the temperature inside the main body 1 from rising.

On the first carriage 41 ₁ , in addition to the exposure lamp 4 and the mirror 5, as shown in FIG. 1, a light distribution plate 42 for distributing the light from the exposure lamp 4 and reflected light from the original D. A slit 43 for guiding the sheet to the mirror 5 and two detectors 44 and 45 for detecting the document size are provided. Detector 4
Reference numerals 4 and 45 are provided at positions displaced in the scanning direction (direction a) of the first carriage 41 ₁ , and the detector 44 is
The detector 45 is provided at a position (b direction; a direction perpendicular to the scanning direction of the first carriage 41 ₁ ) that is turned on with respect to the document D placed on the 4th and 4th sides and the B4 side. It is provided at a position where the document D placed vertically is turned on (direction b; direction perpendicular to the scanning direction of the first carriage 41 ₁ ).

The first carriage 41 ₁ is provided with detectors 44, 4 as shown in FIG. 1 when an automatic document size detection mode key provided on an operation panel described later is selected.
5 is, for example, a document D when an A4 portrait document D is placed.
It has been moved to a position that straddles the (right) end of the so that it is in a standby state.

As a result, when only the detector 44 is turned on, it is determined that the A4 horizontal document D is placed, and when only the detector 45 is turned on, it is determined that the A4 vertical document D is placed. When both the detectors 44 and 45 are turned on, the document D on the A3 horizontal side
It has come to be judged that it is placed.

Although the standby position is the A size system,
If there are many B size systems,
You may change it. For example, the manuscript size detection change mode is selected using the ten keys or the like, and the change from the A size system to the B size system is selected in this mode. By this selection, the standby position is set so that the detectors 44 and 45 are set to B
5 The position is changed so as to straddle the (right side) end portion of the document D when the vertical document D is placed.

Next, the control circuit will be described with reference to the block diagram shown in FIG.

That is, a main control section 51 for controlling the entire copying machine is provided. The main control unit 51 stores an operation panel 52 for instructing various operations, a copying unit 53 for performing a copying operation, a control program, a memory 54 for storing various data, and the detector 4.
A document size detection unit 55 for detecting the document size based on the detection signals from 4, 45 is connected.

The operation panel 52 is composed of a display unit for guiding the operation contents and the like, keys for making various settings, a document size automatic detection mode key, a ten-key pad and the like. The document size detection change mode can be selected by the ten keys or the like.

The copying unit 53 has a moving mechanism 53a for moving the internal first carriage 41 ₁ in the operating direction a, and the moving mechanism 53a is moved when the original size automatic detection mode key is pressed. , The first carriage 4
1 ₁ is set to the standby position.

In the state in which the original size automatic detection mode key is turned on and the first carriage 41 ₁ is set to the standby position, the original size detection unit 55 detects the detector 44.
When only this is turned on, it is determined that the document D on the A4 side is placed,
When only the detector 45 is turned on, it is determined that the A4 portrait original D is placed, and when both the detectors 44 and 45 are turned on, A
It is determined that the three-sided document D is placed, and the determination result is output to the main control unit 51.

As a result, the main control section 51 selects a sheet corresponding to the original size from the original size detecting section 55 and causes the copying section 53 to execute the copying operation.

The standby position may be changed between domestic and foreign (overseas), for example. For example, select the original size detection change mode (serviceman mode) using the numeric keypad, etc.
Select to change from / B size system to LT (letter) / LD (leisure) system. By this selection, the standby position is changed so that the detectors 44 and 45 straddle the (right side) end portion of the document D when the letter-size vertical document D is placed. The standby position is stored in the memory 54 and is read by the selection. For example, domestic "01" and foreign "02" are selected,
Country A, country B, country C, or country D is selected, and the standby position stored in the memory 54 corresponding to the selection is read out and the first carriage 41 ₁ is moved to this other position. .

As a result, when the change to the LT (letter) / LD (ledger) system is selected, as shown in FIG. 5, when only the detector 44 is turned on, the document D placed next to the LT is placed. When only the detector 45 is turned on, the LT
It is determined that the vertical document D is placed, and when both the detectors 44 and 45 are turned on, it is determined that the LD horizontal document D is placed.

Further, although the A size system and the B size system are switched, as shown in FIG. 6, one fixed detector 46 is provided at a position between A4 vertical and B5 vertical, and this detector 46 is used. It may be used to determine whether it is the A size system or the B size system, and change to the A size system or the B size system according to the determination result.

As shown in FIG. 7, the detector 4
In addition to 4, 45, fixed detectors 47, 48, 49 may be provided so that almost all of the A size system and the B size system can be detected by the detection result of each detector. In this case, the detector 47 is provided between B5 and A4 side,
The detector 48 is provided between the A4 landscape and the B5 portrait, and the detector 49 is provided between the B picture portrait and the A4 portrait.

Further, the standby position may be changed to a position for detecting a specific paper of a specific size other than the standard size. For example, select the original size detection change mode (serviceman mode) using the numeric keypad, etc., select the change to specific paper in this mode, and then set the number of movement steps in the scanning direction or the movement value (mm). Give instructions.
As a result, the standby position is changed so that the detectors 44 and 45 straddle the (right side) end portion of the document D when the vertical document D of the specific paper is placed.

As described above, in comparison with the conventional method,
Since there is no time to detect by moving the scanning carriage, the size of the original can be detected at the moment when the original is placed on the original table, so that the operability is improved. Further, as compared to the conventional method, by changing the stop of the scanning carriage and the standby position, it is possible to easily change the correspondence to A / B size type documents and LT / LD type documents.

A user who uses a specific sheet (for example, mixed use of LT / LD type and A / B size type originals. Use a deformed size sheet with a binding margin for a file, etc.) In the case of, it can be dealt with by changing the stop / standby position of the scanning carriage.

Therefore, by providing the two detectors on the scanning carriage of the copying machine at positions that are out of phase with each other in the scanning direction, inexpensive and short-time detection is possible.

[0047]

As described above in detail, according to the present invention,
It is possible to provide a document size detecting device for an image processing device that does not require a large number of detectors and does not require detection time.

[Brief description of drawings]

FIG. 1 is a diagram showing a relationship between a document size detector and a document according to an embodiment of the present invention.

FIG. 2 is an external view showing the configuration of a copying machine according to the present invention.

FIG. 3 is a sectional view showing an internal configuration of a copying machine.

FIG. 4 is a block diagram showing the overall configuration of a copying machine.

FIG. 5 is a diagram showing a relationship between a document size detector and a document.

FIG. 6 is a diagram showing a relationship between a document size detector and a document.

FIG. 7 is a diagram showing a relationship between a document size detector and a document.

[Explanation of symbols]

2 ... manuscript table D ... manuscript 41 ₁ ... first carriage 44, 45 ... detector

Claims (4)

[Claims] 1. An image processing apparatus having scanning means for optically scanning a document placed on a document table, wherein two detection means are provided on the scanning means at positions shifted in phase from each other in the scanning direction. Selecting means for selecting the automatic detection mode of the document size, moving means for moving the scanning means to a predetermined position when the selecting means selects the automatic detection mode, and the scanning means by the moving means. A document for an image processing apparatus, comprising: a determination unit that determines a size of a document placed on the platen according to the detection results of the two detection units in a state where the document is moved to a predetermined position. Size detection device. 2. An image processing apparatus having a scanning means for optically scanning a document placed on a document table, wherein two first scanning means are provided on the scanning means at positions shifted in phase from each other in the scanning direction. Detecting means, at least one second detecting means fixedly provided on the lower part of the original table, selecting means for selecting an automatic detection mode of the original size, and this selecting means selects the automatic detection mode. When the scanning means is moved, the scanning means is moved to a predetermined position, and the scanning means is moved to the predetermined position by the movement means in accordance with the detection results of the first and second detection means. A document size detection device for an image processing apparatus, comprising: a determination unit that determines the size of a document placed on the document table. 3. An image processing apparatus having scanning means for optically scanning a document placed on a document table, wherein two detecting means are provided on the scanning means at positions shifted in phase from each other in the scanning direction. Selecting means for selecting the automatic detection mode of the document size, moving means for moving the scanning means to a predetermined position when the selecting means selects the automatic detection mode, and the scanning means by the moving means. Judging means for judging the size of the original placed on the original table according to the detection results of the two detecting means in the state of being moved to the predetermined position, and instructing means for instructing to change the predetermined position of the scanning means. An original size detecting device for an image processing apparatus, comprising: a changing unit that changes a predetermined position of the scanning unit according to an instruction of the instructing unit. 4. An image processing apparatus having scanning means for optically scanning a document placed on a document table, wherein two detecting means are provided on the scanning means at positions shifted in phase from each other in the scanning direction. Selecting means for selecting the automatic detection mode of the document size, moving means for moving the scanning means to a predetermined position when the selecting means selects the automatic detection mode, and the scanning means by the moving means. A determination unit that determines the size of a document placed on the document table according to the detection results of the two detection units in a state where the scanning unit moves to a predetermined position, and a plurality of predetermined positions of the scanning unit are stored. Storage means, instructing means for instructing to change the predetermined position of the scanning means, and change for selectively changing to the predetermined position of the scanning means stored in the storage means in response to the instruction of the instructing means Document size detection device of the image processing apparatus characterized by comprising a stage, a.