JP2001146337A - Paper carrying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a change of the document moving speed in a reading part due to the load fluctuation when a rear end of a paper sheet is drawn from a paper sheet separating device in an ADF using the retard roller separating method. SOLUTION: As paper sheet carrying device for ADF 1, a paper sheet separating device 10, a carrying roller device 15, a reading roller device 20 formed of a large diameter driving roller 21 at a curved part and pinch rollers 22, 22a are arranged, and an image of a document to be carried at a constant speed is read by a scanning device set in a platen 23. The carrying speed v1 in the carrying roller device is set a little higher than the carrying speed v2 in the reading roller device so as to generate a sag of the paper sheet inside of a curved passage 19, and the speed fluctuation to be generated when a rear end of the paper sheet is drawn from the paper sheet separating device 10 is absorbed by the sag of the paper sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying device in an image reading apparatus, and more particularly, to a sheet conveying speed by a reading roller for conveying a sheet at an image reading position so that the sheet conveying speed does not vary. The present invention relates to a paper transport device that has been used.

[0002]

2. Description of the Related Art In a paper feeder provided in an apparatus such as an automatic document feeder (ADF), a document set on a document tray is separated one by one and conveyed toward a reading unit, and is then transferred to a platen of the reading unit. On the other hand, the reading device is fixed, and the image of the conveyed document is read. The ADF
A pickup roller for taking in sheets from a document tray, a sheet separating apparatus for separating sheets one by one and sending them to a reading unit;
In addition, a reading roller device that conveys the sheet at a constant speed in the reading unit is provided. When the ADF is combined with a flatbed scanner mechanism (FBS) and arranged above the image forming apparatus, the paper transport path of the image reading apparatus is formed in a substantially U-shaped lateral direction, and the paper is extremely formed. It is necessary to be configured to bend and feed with a small radius.

In the case of the above-described configuration, a large-diameter transport roller (reading roller) is arranged inside a U-shaped transport path,
It is considered desirable to form a reading roller device by forming a curved portion of the conveyance path and arranging a reading unit at a position facing the large-diameter conveyance roller. When the reading roller device is configured by using a large-diameter transport roller, a pinch roller is provided with respect to the large-diameter transport roller in the upstream and downstream portions of the reading unit in order to maintain a constant paper transport speed in the reading unit. Are arranged so that the paper transport speed can be kept constant. Further, on the upstream side of the reading roller device, there is provided a sheet separating device in which a separate roller and a retard roller are arranged to face each other.

In a sheet separating apparatus provided upstream of the reading roller apparatus, a separate roller and a retard roller are arranged to face each other, and the separate roller is configured to impart a feeding action in a sheet conveying direction. .
On the other hand, the retard roller performs a transport operation in the direction opposite to the paper transport direction in order to separate the multi-fed paper and return it to the document tray. In a state where the sheet is nipped therebetween, the sheet is provided via a torque limiter or the like so that the sheet is rotated in the transport direction following the sheet transported by the separate roller. Then, the paper separated by the paper separating device is transported toward the reading roller device via a transport roller device disposed downstream thereof.

[0005]

In the paper transport device provided in the ADF, when the paper is straddling between the paper sorting device and the reading roller device, the paper transport speed in the paper sorting device is increased by the reading roller device. , The reading roller device conveys the sheet in a pulled state. When the trailing edge of the sheet comes out of the sheet separating device, a load change occurs in the reading roller device, and the load change may cause the reading roller device to over rotate. This is transmitted to the sheet, and the movement of the sheet in the reading unit becomes unstable, which affects reading of an image. Further, in the state where the retard roller of the sheet separating apparatus is separating sheets, and in the state where one sheet is nipped by the sheet separating apparatus and the retard roller is wrapped around the sheet, the sheet is separated from the downstream conveying roller apparatus. It is assumed that the load fluctuates, and that the load fluctuation in the sheet separating device directly acts on the reading roller device and affects the sheet conveying speed in the reading roller device. Therefore, if a speed change occurs in the reading roller device, the read image appears as expansion and contraction or distortion, which affects the image quality of the read image.

SUMMARY OF THE INVENTION An object of the present invention is to provide a sheet conveying apparatus in which the influence of load fluctuation on sheets in a sheet separating apparatus and a conveying roller apparatus does not affect the sheet conveying speed in a reading roller apparatus.

[0007]

According to the present invention, there is provided a sheet separating apparatus for separating and conveying a sheet, and a reading roller apparatus for conveying a sheet to an image reading unit disposed downstream of the sheet separating apparatus in the sheet conveying direction. The present invention relates to a sheet transport device having the same. The invention according to claim 1 of the present invention is characterized in that a transport roller device is disposed between the paper separating device and the reading roller, and the paper is transported while forming a slack between the transport roller device and the reading roller. And By providing the sheet with slack, a load variation in the roller device upstream of the reading roller device does not affect the sheet conveyance speed in the reading unit.

According to a second aspect of the present invention, the paper transport speed of the transport roller device is set higher than the paper transport speed of the reading roller. Therefore, by setting the transport speed of the transport roller device to be higher than that of the reading roller device, a slack is formed in the sheet, and the transmission of the load fluctuation by the slack portion of the sheet can be prevented.

According to a third aspect of the present invention, the guide path is provided at an interval capable of holding the slack of the paper even in the conveyance path on which the slack of the paper is formed, even if the paper is the maximum size used. Features. Further, even with the maximum size of paper that can be used in the image reading apparatus, it is possible to provide a sufficient slack in the transport path to absorb the load fluctuation.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a sheet conveying device according to the present invention. FIG. 1 illustrates an ADF (automatic document feeder) 1 used in combination with a facsimile machine or an image forming apparatus and used for reading a document image. In the automatic document feeder 1, the sheet is transported through a transport path configured in a substantially U-shape in a horizontal direction, and the transport path includes a transport path 14 from an insertion port 14a, a curved path 19, and ,
It comprises a discharge path 24 connected to the discharge tray 72, and is configured so that an image of a document is read by a reading device at a position of a platen 23 disposed below the curved path 19. In the automatic document feeder 1, an intermediate frame 30 and an upper frame 3 are provided in combination with a base frame 2 disposed above the image forming apparatus. The intermediate frame 30 is provided so as to be able to swing around the shaft 18 of the drive roller 17 of the transport roller device 15.

In the example shown in FIG. 1, the pickup roller 5 which is positioned at the paper insertion opening 14a and is supported by the swingable arm 6 for transporting the paper in the paper transport path; 10, a transport roller device 15, a reading roller device 20 in which a large-diameter drive roller 21 and a plurality of pinch rollers 22, 22a are disposed, and a discharge roller device 25. Among the rollers, the upper frame 3 includes a pickup roller 5 for taking in a sheet from a tray, a separate roller 11 of a sheet separating device 10, and a pinch roller 16 of a transport roller device 15.
And a pinch roller 22 for the large-diameter drive roller 21.

The two pinch rollers 16 and 22 are mounted on a roller support frame 7a supported by a stay 7 disposed on the upper frame 3 via a biasing spring and a support arm (not shown). Are pressed against the corresponding drive roller with a constant pressing force. A guide plate 8 facing the large-diameter drive roller 21 of the curved path 19 is disposed on the upper frame 3 to serve as a guide for the upper surface of the sheet in the curved path 19. Further, a guide member 9 and a guide film 9a are arranged as a guide at the lower part of the curved path 19, and the paper fed from the transport roller device 15 is
It is guided toward the drive roller 21 of the reading roller device 20.

The intermediate frame 30 has a document tray 7
1, an upper cover (see FIG. 2) serving as a lower guide plate for a sheet insertion port 14a, a retard roller 12 of a sheet separating device 10, a driving roller 17 of a transport roller device 15, and a driving roller of a discharge roller device 25. 27 are provided. Further, a large-diameter drive roller 21 and a pinch roller 22a for performing a transport operation on the curved path 19 of the sheet transport path, and a pinch roller 26 of a discharge roller device 25 are disposed on the base frame 2, and the base frame 2 Reference numeral 2 denotes a reading unit and a guide plate member for a transport path on the discharge side. In the apparatus having the above-described configuration, when the paper is jammed in the paper conveyance path, the nip pressure of the nip portion of the conveyance roller device 15 is adjusted, and other maintenance is performed, the apparatus is sequentially opened from the upper frame. By doing so, the work can be performed by opening the paper transport path or exposing each component member.

In the automatic document feeder 1, in order to feed a sheet along a sheet feed path, a sheet insertion port 1 is provided.
The paper is taken in by the pickup roller 5 arranged corresponding to the tray 4a, and sent to the transport path 14. Then, a separating action for the sheet is provided between the separate roller 11 and the retard roller 12 of the sheet separating apparatus 10, and only one sheet is fed toward the transport roller apparatus 15. The paper fed by the transport roller device 15 is nipped between the large-diameter drive roller 21 as the reading roller device 20 and the pinch roller 22 on the curved path 19 of the paper transport path, and passes through the reading section of the platen 23. . A guide film 23b and a white platen 23a are arranged above the platen 23 with a space through which the paper can pass, and used as a guide on the back side of the paper.

In the reading roller device 20, since the paper conveyance speed is maintained constant between the large-diameter driving roller 21 driven at a constant speed and the two pinch rollers, the paper passes through the platen 23. The original is configured so that the moving speed of the image plane does not change. The document whose image has been read as described above leaves the nip portion between the large-diameter drive roller 21 and the pinch roller 22a, passes through the discharge path 24, and is provided with the drive roller 27 and the pinch roller 26 provided opposite to each other. The paper is sent out to the discharge tray 72 by the device 25.

In the automatic document feeder 1, the upper frame 3 and the intermediate frame 30 are sequentially opened so that maintenance of the apparatus can be dealt with. FIG. 2 shows an intermediate frame 3 arranged in the automatic document feeder 1.
0, the intermediate frame 30 is formed by combining a frame 31 formed of a sheet metal and an upper cover 35 serving as a guide plate disposed thereon.
The transport roller device 15 is provided so as to be swingable about a shaft 18 of a drive roller 17. In order to drive the retard roller 12 disposed on the intermediate frame 30,
A transmission gear group 42 supported by the transmission link 40 is disposed, and a shaft 18 of the drive roller 17 of the transport roller device 15 is provided.
Is transmitted via the gear group 42 from the gears provided in the gears. Then, the driving force transmitted to the shaft 18 of the driving roller 17 of the transport roller device 15 is transmitted to the output gear 42 g at the end via the transmission gear group 42, and from the output gear to the shaft 13 of the retard roller 12. When the sheet 13g is engaged with the gear 13g to transmit the drive to the retard roller 12 and perform the sheet separating operation, the retard roller 12 is rotated so as to convey the sheet in the reverse direction with respect to the sheet conveying direction by the separate roller 11. .

The intermediate link 45 is disposed on the shaft 13 of the retard roller 12 via a shaft support 47, and a lower shaft support 48 is locked to the pin member 43. The handle 46 is held by hand. Can be lifted upwards. A pivot 48 of the intermediate link 45 with respect to the pin member 43
Has an opening having substantially the same width as the width of the D-cut portion provided in the pin member 43, and when the transmission link 40 is rotated counterclockwise about the shaft 18 via the shaft support 41, The shaft support 48 of the intermediate link 45 can be detached from the pin member 43.

Further, the positional relationship between the retard roller 12 and the shaft 13 is set, and the shaft support 48 of the intermediate link 45 is set.
The drive transmission to the retard roller is maintained by maintaining the meshing position of the output gear 42g of the transmission gear group 42 and the output gear 42g with respect to the gear 12g of the retard roller 12 by the coupling relationship between the transmission gear 40 and the pin member 43 of the transmission link 40. Be able to do well. In order to make the axis of the retard roller coincide with the axis of the separate roller 11, the illustration of the retard roller 1 is omitted.
By using means for supporting the second shaft 13 so as to be movable only in the vertical direction, the pressing position where the retard roller 12 and the separate roller 11 contact each other (the position where the paper is nipped).
Can always be set to a fixed position.

In addition to the drive transmission mechanism, a pressing force adjusting member 50 as shown in FIGS. 1 and 2 is provided for setting the pressing force of the retard roller 12 against the separate roller 11. The pressing force is adjusted by the screw member 58 and the spring 59 in combination with the pressing plate 55. Adjustment link 51
Is with respect to a shaft support 41 that swings the transmission link 40,
It is arranged on the opposite side via the shaft 13 of the retard roller 12, and the shaft 2 of the drive roller 27 of the discharge roller device 25
8 and is arranged so as to protrude toward the tray side of the intermediate frame 30 via the shaft support portion 53 provided in 8. One end of the adjustment link 51 that can swing through the shaft support 53 is configured as a pressing portion 52 that contacts the lower surface of a corresponding member provided on the shaft 13 of the retard roller 12, and the other end of the adjustment link 51 A pressing plate 55 protruding from the portion is provided, and the pressing portion 52 presses the shaft 13 of the retard roller 12 from below by a pressing action of the spring 59 from the pressing plate.

In the paper transport device provided in the ADF, since the transport speed of the paper separating device 10 is lower than the transport speed of the transport roller device 15, the paper is transported between the transport roller device 15 and the paper separating device 10. In the stretched state, the sheet is conveyed while the conveying roller device 15 is pulling the sheet. Therefore, when the rear end of the sheet comes out of the sheet separating apparatus 10, the conveyance roller apparatus 15 loses the load. The roller device 15 is over-rotated momentarily, and the load fluctuation is caused by the reading roller device 2 passing through the sheet.
0, and the movement of the sheet at the reading position becomes unstable. A similar problem occurs when the trailing edge of the paper slips out of the transport roller device 15 in a state where the paper straddles the transport roller device 15 and the reading roller device 20.
Therefore, in order to prevent the movement of the sheet at the reading position from becoming unstable, the automatic document feeder 1 sets the sheet feed speed (roller peripheral speed) of each roller device as described below. are doing.

In the automatic document feeder 1, a sheet separating device 10, a feed roller device 15, and a reading roller device combining a large-diameter feed roller 21 and pinch rollers 22, 22a for feeding a sheet in a sheet feed path. The transport speed at 20 is set to different values. For example,
When the transport speed of the separating roller 11 of the paper separating device 10 is v3, the transport speed of the transport roller device 15 is v1, and the transport speed of the reading roller device 20 is v2, the relationship v1>v2> v3 is set. ing. Then, the transport roller device 15 and the sheet separating device 1
0, when the sheet is conveyed during the transfer roller device 15
The paper is conveyed as if it were pulled.

When the sheet is located between the transport roller device 15 and the reading roller device 20, the transport speed (v1) of the transport roller device 15 is reduced.
Is faster than the paper transport speed (v2), the paper is slack in the curved path 19 downstream of the transport roller device 15, and a state in which the paper is pulled between the two rollers does not occur. Actually, the relationship of the conveying speed by the roller device is such that the value of v2 is 99 to 99.5% with respect to v1.
It is considered that it is better to set in the range of
The ratio of 2 can be set arbitrarily. In addition,
In the present embodiment, the transport path 19 provided between the transport roller device 15 and the reading roller device 20 has a guide plate 8 on its upper surface.
Are disposed, and the lower surface is regulated by the guide members 9 and 9a and the large-diameter drive roller 21, respectively. When the speed difference between v1 and v2 is set and the thickness T of the transport path (the interval between the upper and lower guide members) is set to about 5 mm, the slack formed on the sheet in the curved path 19 is A4. The upper surface curved between the upper and lower guide members is curved to the extent that it slides on the guide plate 8 in the case of feeding the paper of the size in the vertical direction.
There is only a slight undulation in the interior.

As described above, since the transport speed of the paper in the paper transport path is set, the rear end of the paper being transported over the paper separating device 10 and the transport roller device 15 is separated from the paper separating device. At the moment of exit from the device 10,
Since the conveyance roller device 15 loses the resistance of the sheet separation device 10, the conveyance roller device 15 is over-rotated. However, since a slack is formed in the sheet downstream of the conveyance roller device, the speed variation of the sheet by the conveyance roller device 15 does not affect the reading roller device 20. Since the reading roller unit 20 conveys the original at the reading unit while conveying the paper at a constant speed, the read image information may have problems such as expansion and contraction or distortion, or may affect the image quality of the read image. Can be prevented.

In the paper transport path configured as described above, when the paper is transported at a high speed, the paper is strongly slid on the guide plate on the curved path, and static electricity is generated due to the slide between the paper and the guide plate. . The charging of the static electricity is particularly remarkable in a plastic guide plate having no conductivity. The paper sliding on the guide plate is also transported in the paper transport path while being charged. The speed at which the charged paper is conveyed in the paper conveyance path is not constant,
An effect such as a change in the speed at which the document passes through the reading unit occurs, which leads to a problem that when reading is performed while the document is moved by the automatic document feeder, a defect occurs in the obtained image information.

The problem that the paper is charged is that as the size of the automatic document feeder is reduced and the radius of the curved path for guiding the document is reduced, and as the paper transport speed is increased, the paper is transferred to the guide plate. Are liable to slide strongly against Therefore, in order to cope with the above-described problem of the charging of the paper, for example, it is considered that the guide plate of the paper transport path may be formed of conductive plastic so that the generated static electricity is immediately released. However, configuring the paper conveyance path using a plastic material for the conductive guide plate as described above also causes a significant increase in the manufacturing cost of the apparatus.

In order to cope with the above-mentioned problem that the paper is charged, a guide plate, which is assumed to be strongly slid in the paper transport path shown in FIG. The guide plate is attached to the frame of the device connected to the ground, so that the static electricity generated on the guide plate can be easily released. The conductive guide plates disposed in the paper transport path include guide plates 8 and 8a above the curved path 19 and a reading roller device 20.
Plate 2 that covers the discharge side of the sheet and the lower side of discharge path 24
9, 29 a and the frame 31 on the lower surface of the intermediate frame 30. The frame body 31 is a member on which the paper discharged from the reading roller device 20 slides strongly, and is a member that is easily charged together with the guide plate 29 on the lower surface of the discharge path 24. The large-diameter transport roller 2
The white platen 23a located on the lower surface of the platen 23 and on the upper surface of the platen 23 is also a member on which the paper slides strongly.

As described above, the guide plate on which the sheet conveyed in the sheet conveying path slides strongly is formed as a conductive member formed by processing a sheet metal, and the conductive guide plate is formed. 8, 8a, 29, 29a, 31 can be connected to the metal of the frame of the device. And
Even if the paper is sent to the conductive guide plate while being strongly slid at high speed, even if static electricity is generated, the static electricity is released to the ground through the frame, so that the paper remains charged. It will not be transported. Further, when the charged paper is conveyed and comes into contact with the conductive guide plate, the charged static electricity is released to the ground through the guide plate, so that the paper remains charged. In particular, it is possible to prevent the sheet passing through the portion read by the platen 23 from being affected by static electricity. Further, as described above, when the guide plate disposed at a predetermined position in the paper transport path is made of a material having conductivity, static electricity removal such as a conductive brush used in a conventional copying machine or the like is performed. There is no need to provide any means, and the configuration of the image reading apparatus can be simplified. In addition,
As described above, the sheet is made to be slack in the curved path 19 formed between the transport roller device and the reading roller device, so that the sheet comes into contact with the conductive guide. Static electricity can be easily released. In addition to the above configuration, if the relationship between the transport speeds of the transport roller device 15 and the reading roller device 20 is V1> V2, a slack is formed in the curved path 19 formed between the transport roller device 15 and the reading roller device 20. While the paper is being conveyed. At this time, since the paper is conveyed while the slack portion of the paper is in contact with the guide plate 8, static electricity is generated and the reading speed is not constant. Therefore,
By forming the guide plate 8 with a conductive member created by processing a sheet metal, the paper is not transported while being charged, and the transport speed of the paper changes when passing through the reading portion. Can be prevented.

The example shown in FIG. 3 shows a configuration of a reading device 60 provided integrally with the image forming apparatus. A scanning unit frame 61 is provided with a scanning device 63 configured as shown in FIG. . The scanning device 63 includes a full-rate carriage 64 provided with a lamp 64a and one mirror m1, and two opposing mirrors m2, similarly to a device used in a conventional copier scanning device. m3
Are provided in combination with a half-rate carriage 65 for disposing the. Then, light reflected from the document (information read from the document) is imaged on a CCD 69 through a lens 68, and the CCD 69 converts a light signal into an electric signal and transmits the signal to an image information processing unit of an image forming apparatus. Make up. In the scanning device 63, in order to drive the full rate carriage 64 and the half rate carriage 65, a drive pulley 66 having a diameter set to 2: 1 is provided.
66a is coaxially arranged, and a mechanism is provided for moving the two carriages in conjunction with each other via wires 67, 67a wound around the respective drive pulleys.

An original of a book is placed on the upper part of the frame 61, and the FBS (flatbed scanner) is used.
And a platen 23 disposed below the document feeder 1 corresponding to an ADF (automatic document feeder). The platen 6
2, the document is set by opening the upper opening / closing frame 70, and by closing the upper opening / closing frame 70, the platen cover 73 presses the image surface of the original on the upper surface of the platen to scan the set original. Do. For the original set on the platen 62, the full-rate carriage 64 of the scanning device 63 reciprocates by the length of the original in the scanning direction according to the detection information of a sensor (not shown). Reads the image information while moving at half the speed of the full rate carriage 64, and outputs it as an electric signal from the CCD 69.

Using the reading device 60, the document tray 7
When scanning the original set in 1, the setting of the original in the original tray 71 is performed by operating the control device in response to a detection signal of a detection unit (not shown), or using the original conveyance unit in the control panel. This is performed by inputting a command to perform the scanning. Then, the full-rate carriage 6 of the scanning device 63 is
4 is stopped at a position corresponding to the platen 23, the half-rate carriage 65 is moved to the left end of the scanning unit frame 63, and the originals are sequentially transferred from the original tray 71 one by one.
The document is transported into the mold transport path, and the image of the document is read at the platen 23.

Therefore, in the scanning device arranged on the scanning section frame 61, the two platens 62, 23
A scanning device can be set to handle any document, and image data can be transmitted using the transmission function of the facsimile device or recorded using the function of the copier. Can be printed on paper. Also,
In the case where the automatic document feeder 1 shown in the embodiment is used alone, and in the case where the automatic document feeder 1 and the FBS are integrated with each other, the reading device can be configured as a reading device by itself. . Further, in general, it can be used as a document reading unit provided integrally with an image forming apparatus or as a reading device of a facsimile apparatus.

In the apparatus shown in FIG. 3 as well, in order to deal with the problem of static electricity in the paper transport path of the automatic document transporter 1, the paper is slid strongly as in the case of FIG. The guide plate can be made of a conductive material. Further, since the problem of the charging of the paper in the paper transport path becomes a problem not only in the automatic document transport apparatus but also in a general copying machine or the like, the paper is also charged in the paper transport path of the electrophotographic copying machine. A guide plate or the like for a curved path that is strongly slid may be formed of a guide plate having the same conductivity as that of the present embodiment. When static electricity is generated on the paper, if the paper can be easily released to the frame, various problems caused by the charged paper being conveyed can be avoided.

[0033]

Since the apparatus of the present invention is constructed as described above, a conveying roller device is disposed between the sheet separating device and the reading roller, and the sheet is disposed between the conveying roller device and the reading roller. Since the paper is conveyed while forming slack, by giving the paper slack, the load fluctuation in the roller device in the upstream part of the reading roller device affects the paper conveyance speed in the reading unit. I will not give. If the transport path in which the slack is formed in the sheet is a conductive member, the slack of the sheet comes into contact with the guide plate, so that the static electricity of the sheet can be easily released. In addition, by setting the transport speed of the transport roller device to be higher than that of the reading roller device, a slack is formed in the sheet, so that the load fluctuation can be prevented from being transmitted by the slack portion of the sheet. Furthermore, since the transport path on which the slack of the paper is formed is arranged at intervals capable of holding the slack of the paper even for the paper of the maximum size to be used,
Even a sheet of the maximum size that can be used in the image reading device can have enough slack in the transport path to absorb the load fluctuation.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a structure of an automatic document feeder.

FIG. 2 is an explanatory diagram of a configuration of an intermediate frame arranged in FIG. 1;

FIG. 3 is an explanatory diagram of an image reading apparatus incorporating the mechanism of FIG. 1;

[Explanation of symbols]

1 automatic document feeder, 2 base frame, 3
Upper frame, 5 Pickup rollers, 8
Guide plate, 10 paper separating device, 11 separate roller, 12 retard roller, 14
Transport path, 15 transport roller device, 17 drive roller, 19 curved path, 20 reading roller device, 2
1 Large-diameter drive roller, 22 / 22a pinch roller, 23 platen, 24 discharge path, 25
Discharge roller device, 29 guide plate, 30 intermediate frame, 31 frame frame, 35 upper cover, 45 intermediate link, 50 pressing force adjusting member,
60 reading device, 61 frame, 62 platen, 63 scanning device, 64 full rate carriage, 65 half rate carriage, 68
Lens, 69 CCD.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Koji Yamamoto, inventor F-term (reference) 3F049 DA12 DA14 EA14 LA02 LB02 3F101 FB14 LA02 LB02 5C062 AA02 AA05 AB17 AB31 AB32 AC11 AD06 BA00

Claims (3)

[Claims] 1. A sheet conveying device comprising: a sheet separating device that separates and conveys a sheet; and a reading roller device that conveys a sheet to an image reading unit disposed downstream of the sheet separating device in a sheet conveying direction. A sheet conveying device, wherein a conveying roller device is disposed between a sheet separating device and a reading roller, and the sheet is conveyed while forming a slack between the conveying roller device and the reading roller. 2. A paper transport speed of the transport roller device,
2. The sheet conveying device according to claim 1, wherein the sheet conveying speed is set higher than the sheet conveying speed of the reading roller. 3. A conveyance path on which a slack of a sheet is formed, wherein a guide plate is arranged at an interval capable of holding the slack of the sheet even if the sheet is the maximum size used. 3. The paper transport device according to 1 or 2.