JPH07215538A - Sheet material double feed detection device, sheet material feeding device, and image recording device - Google Patents

Abstract

(57) [Abstract] [Purpose] Sheet material double feed detection means for sheet material continuous feeding and feeding system, sheet material feeding device and image recording apparatus including such continuous feeding and feeding system To
With an inexpensive configuration, the double feed detection function always works correctly,
Even if a double feed occurs, for example, in an image recording apparatus, it is possible to clearly distinguish a photographed or read document from a non-photographed or unread document. [Structure] Sheet material thickness detecting means 6, 7, 49 for detecting the thickness of a fed sheet material S, which is provided in a continuous sheet feeding and conveying path of sheet material, and a sheet from the sheet material thickness detecting means. The multi-feed detecting means 100 detects that the sheet material is double-fed based on the material thickness detection signal, and the multi-feed detecting means stores the thickness of the first sheet material in the continuous feeding of the sheet material. And a multi-feed determining unit that determines whether or not the multi-feed is performed by comparing the memory sheet material thickness with the second and subsequent sheet material thicknesses.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet material double feed detecting device in a continuous sheet feeding and conveying system for a sheet material, and a sheet material feeding device and an image recording apparatus including such a continuous sheet feeding and conveying system.

[0002]

2. Description of the Related Art For example, in an image recording apparatus or image forming apparatus such as a rotary camera, a copying machine, a printer, a facsimile, a printing apparatus, etc., a sheet material such as an original, a transfer paper, a recording paper, a printing paper or the like is fed from a paper feeding section. An image recording process or an image forming process is performed by continuously feeding one sheet to an image reading unit such as a photographing unit / photoelectric reading unit / exposure unit or an image forming unit such as a transfer unit / printing unit. There is also a sheet material processing apparatus that continuously feeds one sheet from a paper feeding section to an appropriate processing section to perform processing such as punching, cutting, and coating.

For the sake of convenience, an image recording apparatus for sequentially recording images of sheet-like objects such as checks on a recording medium such as microfilm will be described as an example. FIG. 7 is a schematic configuration diagram of an example of a rotary camera as such an image recording device.

Reference numeral 51 is a camera main body, and 52 is a paper feed section connected to the camera main body. When a sheet-like subject such as a check (hereinafter referred to as a document or a paper) is inserted into the sheet feeding port 53 of the sheet feeding unit 52, the inserted document is fed by the sheet feeding roller 54.
And the separation roller 55 sequentially separates and conveys the sheets one by one from the top in the sheet feeding section 52 at high speed and continuously,
It is introduced into the camera body 51 through a sheet path 57 composed of 6.56. 61 and 62 are the seat path 5
A pair of intermediate transfer rollers arranged at the end of No. 7, 58/59
Reference numeral 60 denotes a roller pair and a sensor of a paper thickness detecting mechanism arranged between the roller pair of the sheet feeding roller 54 / separation roller 55 of the sheet path 57 and the intermediate transfer roller pair 61/62, which will be described later.

The original introduced from the side of the paper feed section 52 to the side of the camera body 51 is a roller 63.
Belt 6 hung on rollers such as 64, 65, 66, etc.
7, a lower conveyance belt mechanism including pinch rollers 68, 69 and the like conveys the inside of the camera body 51 to the inner side, and then conveys upward along the rollers 66 to form a pair of front and rear parallel glass plates (guide glass ) Pass between 70 and 71.

In the process of passing, both sides of the conveyed document are passed through the glass plates 70 and 71 on that side and the illumination lamp 7
Illuminated by 2.73. Reflected light of the illumination light on the front surface side and the back surface side of the original enters the slits 74 and 75 on the respective sides through the glass plates 70 and 71, respectively, and reaches the camera chamber 76 via an optical system (not shown) to scan the original. The image information on the front side and the image information on the back side are reduced and projected onto the microfilm.

The original document which has been photographed and passed between the glass plates 70 and 71 is provided with rollers 77, 78 and 79, belts 80 attached to those rollers, rollers 81, 82 and 83 and belts attached to those rollers. It is conveyed upward by an upper conveyor belt mechanism composed of 84 and the like, and then conveyed to the front side, and is sequentially ejected from the ejection port 85 onto the paper ejection tray 86 to be stacked.

In the paper feed section 52, the paper thickness detection mechanism 5
8.59.60 has a structure as shown in FIG.
That is, of the upper and lower roller pairs 58 and 59, the lower roller 58 holds both ends of its shaft 58a by fixed bearings, and the upper roller 59 fixes one end of its shaft 59a. The bearing is held by a bearing, and the shaft ends on the other side are held by a movable (not shown) bearing having a freedom of movement in the vertical direction and pressed against each other. And this roller pair 58.
When the document S passes between the 59, the upper roller 59 is pushed up according to the thickness of the document S, and the shaft 59 of the roller 59 is
The movable bearing side of a is displaced upward. The upward displacement is detected by the sensor 60. That is, the thickness of the document passing through the roller pair 58/59 is detected.

The sensor 60 always measures the thickness of the fed document, and when the thickness exceeds a preset thickness, it is judged that the document has been fed multiple times, and a warning is issued or the document is fed. The drive of the roller 54 was stopped. Based on this, the operator has stopped the apparatus or removed the document left in the apparatus to perform the re-imaging process.

[0010]

However, in the conventional example, since the potentiometer is used as the sensor 60 to obtain the thickness of the document, the structure becomes very expensive. Further, the operator had to check the thickness of the document before feeding the sheet, and had to input the thickness. Furthermore, when documents of different thicknesses are continuously fed, the double feed detection function may not work properly.

Even if a warning is given after determining that the document has been double-fed, since the images are continuously shot at high speed, the originals will be taken with the images overlapped, and it will not be known which document was double-fed, and the original image will be taken. Have to start over. Even if the separation roller drive is stopped after double feeding is detected,
The originals are shot with overlapping. Therefore, the double-fed original must be re-photographed, and not only is the microfilm wasted, but there are more images of the original captured on the film than there is in the original, making it easier to search when browsing the microfilm. However, there was a drawback that problems would occur.

The same applies not only to the rotary type camera of the above-described example, but also to an apparatus for recording image information of a document on a recording medium such as an optical disk, a magnetic tape, a floppy disk, an image forming apparatus such as a copying machine or a printer, or a sheet. The same applies to a sheet material feeding device, a sheet material processing device, and the like capable of continuously feeding one sheet material such as a document, a transfer paper, a recording paper, and a printing paper like a material processing device.

Therefore, according to the present invention, the double feed detecting means for the sheet material has an inexpensive structure, and the double feed detection function always works properly. Even if the double feed occurs, for example, in an image recording apparatus, photographing or reading is performed. It is an object of the present invention to provide a sheet material double-feed detection device, a sheet material feeding device, and an image recording device capable of clearly distinguishing an already-written original document from an unphotographed or unread original document. .

[0014]

SUMMARY OF THE INVENTION The present invention is characterized by the following constitutions, a sheet material double feeding detection device, a sheet material feeding device,
And an image recording device.

(1) Sheet material thickness detecting means for detecting the thickness of the fed sheet material, which is provided in the continuous feeding and conveying path of the sheet material, and the sheet material from the sheet material thickness detecting means. It has a double feed detecting means for detecting that the sheet material is double-fed based on the thickness detection signal, and the double feed detecting means is means for storing the sheet material thickness of the first continuous sheet feeding of the sheet material. ,
A sheet material double-feed detection device having a double-feed determination means for determining whether or not a double-feed is performed by comparing the memory sheet material thickness and the sheet material thicknesses of the second and subsequent sheets.

(2) A sheet for detecting the thickness of the fed sheet material, which is provided in the sheet material conveying path of the sheet feeding section having the sheet material conveying means capable of continuously feeding the sheet material. The material thickness detecting means, the double feeding detecting means for detecting that the sheet material is double fed based on the sheet material thickness detection signal from the sheet material thickness detecting means, and the sheet feeding section can be independently stopped. The double feed detecting means has means for storing the first sheet material thickness of the continuous sheet feeding of the sheet material, the memory sheet material thickness and the second and subsequent sheet material thicknesses. 2. A sheet material feeding device, comprising: a multi-feed discriminating means for discriminating whether or not a multi-feed is made by comparing the above.

(3) The sheet material feeding device as described in (2), characterized in that the sheet feeding section stopping means is operated by the double feeding detection signal of the double feeding determining means.

(4) When the sheet material thickness detection signal has changed by a specified value or more and the change of a further specified value or more is seen before returning to the original level, the double feeding detecting means determines the double feeding. The sheet material feeding device as described in (2) above.

(5) The sheet feeding section stopping means double feeds sheets to a predetermined position so as to separate a normal sheet feeding section and an abnormal sheet feeding section based on the double feeding detection signal from the double feeding detecting section. The sheet material feeding device according to (2), having means for stopping the material.

(6) In an image recording apparatus for carrying out an image recording process by continuously feeding one sheet-shaped original from the paper feeding section to the image reading section, the image forming apparatus is provided in the original conveying path and An original thickness detecting means for detecting the thickness, a double feeding detecting means for detecting that the originals are double-fed based on a signal from the original thickness detecting means, and an independent stopping of the paper feeding section. And a means for storing the thickness of the first original document in continuous feeding of the original document,
An image recording apparatus comprising: a multi-feed determination unit that determines whether or not a multi-feed is performed by comparing the stored document thickness with the thicknesses of the second and subsequent documents.

(7) The image recording apparatus according to (6), characterized in that the sheet feeding section stopping means is operated by the double feeding detection signal of the double feeding determining means.

(8) The double feed detecting means determines that the document is double fed when there is a change in the document thickness detection signal by a predetermined value or more and a further change by the predetermined value or more before returning to the original level. (6) The image recording apparatus described in (6).

(9) The above-mentioned paper feeding section stopping means, based on the multi-feeding detection signal from the multi-feeding detecting means, carries out multi-feeding of originals to a predetermined position so as to separate a normal paper feeding portion and an abnormal paper feeding portion. The image recording apparatus according to (6), having means for stopping.

(10) The image recording apparatus is a photographing apparatus for continuously feeding one sheet of a document sheet from the paper feeding section to the photographing section to perform photographing and recording processing (6) to (9).
The image recording device described in 1.

[0025]

In the present invention, an inexpensive member such as a photo interrupter may be used as the means for determining the thickness of the feeding sheet material.
By this means, the thickness of the first sheet of the continuously fed sheet material is automatically measured, and the slice is then detected for double feeding, so that the correct operation can be performed. Then, instead of using a fixed slice, it is possible to detect that the sheet material has changed in two stages.

Further, after the double feed is detected, the driving of the paper feed section is stopped, and then the unprocessed sheet material is discharged, so that the image recording apparatus can re-photograph from the multi-fed unphotographed original, The film is not wasted and the operability is good.

That is, by providing a paper thickness detecting mechanism using an inexpensive photo interrupter in the middle of the sheet material conveying path, a reliable double feed detecting function can be realized at low cost.

By using the double feed detection auto mode,
The user can use the double-feed detection function without being aware of the sheet material thickness, and it works correctly even for different sheet material thicknesses.

Further, by stopping the paper feeding unit even when double feeding occurs, in an image recording apparatus such as a rotary camera, for example, a photographed document and a non-photographed document are distinguished so that the user can clearly see them, and Re-shooting can be performed without wasting the film, and since the number of fed originals and the number of original images shot on the film match, no problem occurs in the search when browsing the microfilm.

[0030]

【Example】

<Embodiment 1> (FIGS. 1 to 5) FIG. 1 is a schematic configuration diagram of an apparatus according to the present embodiment. The device of this example is a rotary camera.

Reference numeral A denotes a camera body, and B denotes a paper feeding unit which can be attached to and detached from the camera body A. Reference numeral 1 denotes a paper feed plate provided in the paper feed unit, on which a sheet-like document S such as a check (hereinafter referred to as document or paper) as a subject is placed and set. The placed set document S is formed by a pair of rollers 4 and 5 (paper feeding means capable of continuous feeding) of a feeding roller 4 rotating in the feeding direction and a separating roller 5 rotating in the opposite direction to the feeding direction. By cooperation, the upper ones are sequentially separated and conveyed into the sheet feeding unit B.

The conveyed document passes between a pair of detection rollers 6 and 7 forming a part of a paper thickness detection mechanism (paper thickness detection means) described later, rollers 8 and 9, and a belt 10 hung on these rollers. , Pinch roller (conveyance presser roller) 11/12/1
Camera body A by a belt transport mechanism composed of 3 etc.
Be introduced to the side.

The document S introduced from the side of the paper feed unit B to the side of the camera body A is rollers 15, 16, 17, and 18, belts 19 wound around these rollers, and pinch rollers 21.
It is conveyed upward from the horizontal conveyance by a lower belt conveyance mechanism composed of 22 and the like, and passes between a pair of parallel glass plates (guide glasses) 24 and 25 which are exposure units.

In the course of the passage, both front and back surfaces of the conveyed document S are illuminated by halogen lamps (illumination lamps) 26 and 27 through the glass plates 24 and 25 on the sides thereof, respectively. The reflected light of the illumination light on the front side and the back side of the document passes through the glass plates 24 and 25, the mirrors 28 and 29 and the slits 30 and 31 on each side, and is guided to a camera unit (camera room) not shown in the drawing. Then, a miniature exposure is taken on the microfilm.

The photographed original that has passed between the glass plates 24 and 25 has rollers 32, 33, 34 and 35, a belt 36 hung on these rollers, and pinch rollers 37, 38 and 39.
Is conveyed upward by the upper belt conveying mechanism consisting of
Then, the paper is conveyed to the front side along the roller 35 and is discharged to the paper discharge table 40.
It is discharged one after another and piled up.

The belt transport mechanism on the paper feed unit B side is in communication with the lower transport mechanism on the camera body A side via a clutch 14 (paper feed unit stopping means), and the paper feed unit B engages this clutch 14. It is driven by receiving power transmission from the side of the camera body A via. By turning off the clutch 14, the power to the sheet feeding unit B is cut off. That is, the paper feeding unit can be stopped independently.

Reference numeral 23 denotes a document detection sensor (paper sensor) disposed next to the pinch roller 21 of the lower belt transport mechanism on the camera body A side, and a signal from the sensor 23 is a drive control of the micro film of the camera unit. Used for.

FIG. 2 is a block diagram of the document thickness detecting mechanism. The upper roller 6 of the pair of upper and lower paper thickness detection rollers 6 and 7 has both ends of its roller shaft 6a rotatably held by bearings 42 and 42 fixedly arranged (positionally fixed) on the device side plates 41 and 41, respectively. A pulley 43 is provided at the shaft end on one side thereof, a belt 44 is hung on the pulley 43, and power is transmitted through the belt 44 and the pulley 43 to be rotationally driven. The lower roller 7 has a shaft end on one side of the roller shaft 6a (detection shaft) rotatably held by a bearing 45 fixedly arranged on the device side plate 41, and the other shaft end on the device side plate 41 in the vertical direction. The movable bearing 46, which is provided with a degree of freedom of rotation, is rotatably held by the bearing, and the movable bearing 46 is constantly pushed up and urged by the spring 47 to press the lower roller 7 against the lower surface of the upper roller 6. is there.

Therefore, when the original S separated and fed by the paper feed roller 4 and the separation roller 5 next enters and passes through the pressure nip portion of the pair of upper and lower paper thickness detection rollers 6 and 7, it is conveyed. The lower roller 7 is pushed down against the spring 47 according to the paper thickness of the document S, and the roller shaft 7a of the lower roller 7 uses the fixed bearing 45 as a fulcrum to move the movable bearing 46.
The side moves down. Then, the roller shaft end on the side of the movable bearing 46 that has moved downward pushes down the blade 48 of the photointerrupter 49 which is a paper thickness detection sensor. Then, the paper thickness detection sensor 49 outputs according to the movement amount of the blade 48, that is, the thickness of the document S.

FIG. 3 shows the output characteristic of the paper thickness detecting sensor 49, and the output changes depending on the moving distance of the blade 48. For example, when there is no document S between the upper and lower roller pairs 6 and 7, an output corresponding to the document thickness is obtained, such as x point, and y point when there is, and the movement of the blade 48 when the document S passes through. L
Since the range is within the range, a linear output with respect to the document thickness can be obtained and the paper thickness can be detected.

FIG. 4 shows a block diagram of the control system.
The paper thickness signal from the paper thickness detection sensor 49 is the A / D converter 10
By 1, it becomes a binary signal and is input to the control circuit 100.

The control circuit 100 determines whether or not there is a double feed by comparing the stored document thickness with the means for storing the thickness of the first original document for continuous feeding and the second and subsequent original document thicknesses. It has a double feed determining means.

The control circuit 100 also controls the operation unit 103 and the display unit 104, and also controls the paper feed unit drive clutch 14, the main drive motor 105, and the like.

The method of double feed detection will be described below. In FIG. 5, the original S is a pair of upper and lower rollers 6 and 7 of the paper thickness detection mechanism.
The signal obtained when entering and passing in between is shown.
FIG. 5A shows that three originals S have successively passed.

There are two methods of detecting the double feed: a manual mode and an automatic mode.

When the double feed detection is activated in the manual mode, the operator first selects the manual mode on the operation unit 103 (FIG. 4) and selects one of the originals to be photographed.
Feed the sheets. The control circuit 100 samples the paper thickness of the original document every 1 ms as shown in FIG. 5B, averages these values, and records them as paper thickness data. Furthermore, 1.5 times the current paper thickness is set as the slice level. After completing the settings, feed the document you want to shoot. During continuous paper feeding, the control circuit 100 constantly monitors the paper thickness every 1 ms. When the slice level is exceeded as shown in FIG. Put out or sound the buzzer.

On the other hand, when the double feed detection is activated in the auto mode, the auto mode is selected by the operation unit 103, and subsequently the photographed originals may be continuously fed. In the control circuit 100, the slice level is set according to the thickness of the first sheet of continuous paper feeding, and for the second and subsequent documents, double feed is monitored with reference to this slice level.

By the way, in the auto mode, the thickness of the first sheet of continuous paper feeding is set, so that if the first sheet is double-fed, the detection cannot be performed correctly. There 2
1 if the thickness of the paper after the first is less than half of the thickness of the first
A warning is issued by double feeding the first sheet ((d) of FIG. 5).

<Embodiment 2> (FIG. 6) In many cases, the originals to be photographed include those having different paper thicknesses. In such a case, as shown in FIG.
The change in paper thickness is detected in a sheet of paper and the judgment of double feeding is made.
Here, one sheet of paper is a portion f in which the paper thickness values equal to or larger than the minimum paper thickness are continuous, and the control circuit 100 first changes the paper thickness signal above the minimum paper thickness from where there is no paper like g. If there is, it is determined that the document has started to pass through the paper thickness detection units 6 and 7. While the document is passing, the paper thickness is monitored every 1 ms, and if there is a change more than the minimum paper thickness such as h, it is judged as a double feed. As a result, even if originals having different paper thicknesses are mixed and continuously fed, the double feed detection function works properly.

<Embodiment 3> After the multi-feed detection function determines that the multi-feed has occurred, the paper feed section B controls the paper feed section drive clutch 14 (FIG. 1) from the control circuit 100 to detect the multi-fed original. Feeder B so that the leading edge stops between rollers 9 and 13
By cutting off the drive of the original S
2, S3, S6, and S7 remain in the paper feed section B, and the originals S1 and S5 before that are continuously conveyed by the belt 19 and are photographed. That is, the undelivered originals S2, S3, S
6, S7 remain in the paper feed section B, and the photographed subject S1,
Surely separated from S5.

The operator selects the originals S2, S remaining in the paper feed section B.
When the operation unit 103 performs an operation of rejecting 3, S6, S7, the paper feed unit drive clutch 14 is re-engaged and the unphotographed originals S2, S3, S6, S7 are discharged to the stacking table 40. At this time, it may be discharged to a discharge port (not shown) having a different structure. Alternatively, the sheet feeding unit drive clutch 14 may be configured to be reversible and may be discharged to the sheet feeding port. The discharged originals are re-photographed after confirming the order.

By providing the paper thickness detecting mechanism (FIG. 2) using the photo interrupter 49 in the middle of the sheet-like document conveying path as in the apparatus of the first to third embodiments, it is possible to inexpensively and reliably perform the double feeding. A detection function can be realized. By using the multi-feed detection auto mode, the user can use the multi-feed detection function without being aware of the paper thickness, and can properly function for different paper thicknesses. Further, even if a double feed occurs, by stopping the paper feed section B, the photographed document and the unphotographed document can be clearly discriminated from each other so that the user can re-photograph without wasting the microfilm and feed the document. Since the number of originals and the number of captured original images on the film match, no problem occurs in the search when browsing the microfilm.

Although the rotary type camera has been described above as an example,
The present invention is not limited to this, and the image information of the original is recorded on the optical disc.
A single sheet material such as an original, transfer paper, recording paper, printing paper, etc. such as a device for recording on a recording medium such as a magnetic tape / floppy, an image forming device such as a copying machine / printer, a sheet material processing device, etc. It can also be applied to a sheet material feeding device and sheet material processing device capable of feeding.

[0054]

As described above, according to the present invention, there is provided a sheet material double-feeding detecting device in a continuous sheet feeding / conveying system for a sheet material, a sheet material feeding device and an image recording apparatus including such a continuous feeding / conveying system. The material double feed detection means has an inexpensive structure, and the double feed detection function always works properly. Even if a double feed occurs, for example, in an image recording apparatus, a document that has been photographed or read and a document that has not been photographed or has not been photographed. The originals that have already been read can be clearly distinguished, and the intended purpose is often achieved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an apparatus (rotary camera) according to a first embodiment.

[Fig. 2] Configuration diagram of paper thickness detection mechanism

[Fig. 3] Output characteristic diagram of paper thickness detection sensor (photo sensor)

FIG. 4 Block diagram of control system

5A to 5D are paper signal diagrams, respectively.

FIG. 6 is a paper thickness signal diagram of the apparatus according to the second embodiment.

FIG. 7 is a schematic configuration diagram of a conventional example device (rotary type camera).

FIG. 8 is an explanatory diagram of a paper thickness detection mechanism.

[Explanation of symbols]

A camera body B paper feed unit (paper feed unit) S original (sheet material) 4.5 paper feed roller / separation roller (paper transport means capable of continuous paper feed) 6/7 49 paper thickness detection roller pair Paper thickness detection sensor (sheet material thickness detection means) 100 Control circuit (double feed detection means) 14 Paper feed section drive clutch (paper feed section stop means)

Claims (10)

[Claims] 1. A sheet material thickness detecting means for detecting the thickness of the fed sheet material, which is provided in a continuous sheet feeding and conveying path of the sheet material, and a sheet material thickness from the sheet material thickness detecting means. A multi-feed detecting means for detecting that the sheet material is double-fed based on the detection signal, wherein the multi-feed detecting means stores the thickness of the first sheet material in the continuous feeding of the sheet material; A sheet material double-feed detection device having a double-feed determination means for determining whether or not a double-feed is performed by comparing the memory sheet material thickness and the sheet material thicknesses of the second and subsequent sheets. 2. A sheet material conveying path of a sheet feeding section having a sheet material conveying means capable of continuously feeding sheet materials,
Sheet material thickness detection means for detecting the thickness of the fed sheet material, and a weight for detecting that the sheet material is double-fed based on a sheet material thickness detection signal from the sheet material thickness detection means. The sheet feeding detection means and the sheet feeding portion stopping means capable of independently stopping the sheet feeding portion are provided, and the double feeding detection means stores the sheet material thickness of the first continuous sheet feeding of the sheet material. A sheet material feeding device, comprising: a double feed determining means for determining whether or not a double feed is performed by comparing the memory sheet material thickness with the second and subsequent sheet material thicknesses. 3. The paper feed section stopping means is operated by a double feed detection signal of the double feed determining means.
The sheet material feeding device described in. 4. The double feed detecting means determines that the sheet material thickness detection signal is a double feed when the sheet thickness detection signal has changed by a predetermined value or more, and further changes by a predetermined value or more before returning to the original level. The sheet material feeding device according to claim 2. 5. The sheet material feeding means for stopping the sheet feeding, based on the double feeding detection signal from the double feeding detecting means, feeding the sheet material to a predetermined position in order to separate a normal feeding portion and an abnormal feeding portion. The sheet material feeding device according to claim 2, further comprising means for stopping. 6. An image recording apparatus for performing an image recording process by continuously feeding sheet-shaped originals from the paper feeding unit to the image reading unit, the thickness of the fed originals being provided in the original conveying path. It is possible to independently stop the document thickness detecting unit for detecting the height, the multi-feed detecting unit for detecting that the document is double-fed based on a signal from the document thickness detecting unit, and the sheet feeding unit independently. Comparing the stored original document thickness with the second and subsequent original document thicknesses, the double feed detection means has a possible paper feed unit stopping means, and the double feed detection means stores the original document thickness of the first continuous document feed. An image recording apparatus comprising: a multi-feed discriminating means for discriminating whether or not the multi-feed is performed. 7. The paper feed section stopping means is operated by a double feed detection signal of the double feed determining means.
The image recording device described in 1. 8. The multi-feed detecting means determines that the document is double-fed when the document thickness detection signal has changed by a prescribed value or more and further changed by a prescribed value or more before returning to the original level. The image recording apparatus according to claim 6, wherein. 9. The paper feed section stopping means detects the duplication of originals fed to a predetermined position so as to discriminate between a normal paper feed portion and an abnormal paper feed portion based on a multifeed detection signal from the multifeed detection means. The image recording apparatus according to claim 6, further comprising a stopping unit. 10. The image recording apparatus according to claim 6, wherein the image recording apparatus is a photographing apparatus that continuously feeds a sheet-shaped document from a sheet feeding section to a photographing section for one sheet and performs a photographing recording process. Image recording device.