JPH0223146A - Original conveying device - Google Patents

Abstract

PURPOSE:To increase the number of originals to be conveyed per unit time by providing such an arrangement that during discharge of a preceding original, the next one of stacked originals is started to be fed. CONSTITUTION:A drive motor is reversed to feed an original D from a paper feed section 200, and then the drive motor is changed over from the reverse mode into its normal mode so that the original D is conveyed on a platen glass pane 11 by means of a second paper feed roller 226 and a follower roller 240, being made into press contact with the glass pane. Further the original D is exposed to light in such a close contact condition that it is pressed against the glass pane 11. After completion of the exposure, the drive motor is normally rotated so that the original passes over the nip position between a paper discharge roller 401 and a pinch roller 403 in a paper discharge section 400, and is stopped in the vicinity of a paper discharge opening. When the drive motor is reversed, the original D intends to move back, but it is forced to be held since a one-way clutch provided at one end of the shaft of the paper discharge roller 401 stops the rotation of the roller 401. Simultaneously, the next original D is fed out. That is, the next original is started to be fed during discharge of the preceding original.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention automatically feeds a document onto a document table (platen glass) of a copying machine, an image reading device, etc., and places the processed document on the document table. This invention relates to an improvement in a document conveying device for ejecting a document from a document.

[Conventional technology]

Generally, this type of document feeder includes a document storage section (paper feed tray) disposed on the side of the document table, and a document feeder that feeds the document sheet by sheet from the paper feed tray toward the document table. a feeding means, which is disposed on the document table, and conveys the fed document and fixes it at an exposure position on the document table surface, and when exposure of a predetermined number of sheets is completed; It is composed of a document conveyance means for discharging the document from the document table, and a paper discharge means for collecting the exposed document and placing it on the paper discharge tray.

Generally, this type of document conveying device is equipped with a document conveying means that presses the document against the platen glass surface of a copying machine using a white endless belt, and conveys the document by the movement of the belt. . That is, this document conveying means covers the entire surface of the platen glass with an endless belt and presses the document, and conveys the document while generating a frictional force with a proper position on the surface of the document by the slight slack of the endless belt. For this reason, (1) a sufficient space in the thickness direction for the belt to rotate was required, resulting in an increase in the overall height and size of the device body;

■The pressing force decreases over time due to fatigue and deterioration of the belt, and troubles due to lack of elasticity tend to occur, resulting in poor maintainability.

■A large, high-output motor must be used to rotate the belt while sliding it on the platen glass.

It had problems such as.

The present applicant has previously proposed an original document conveying device that improves the above-mentioned problems and can simultaneously reduce the thickness of the device and improve maintainability (Japanese Patent Application No. 63-3341).

In order to convey the document of the present invention, a white sheet member is provided in the apparatus body disposed on the copying machine and runs along the platen glass surface, and the document conveyance roller is slid onto the platen glass surface through a through hole provided at an appropriate position in the sheet member. The structure is such that the overall height of the apparatus is low and the document can be conveyed without using an endless belt.

The document conveyance rollers of the document conveyance device are composed of a plurality of roller groups for conveying documents of various sizes on the platen glass, and each roller receives rotational force from a drive source.

[Problem that the invention seeks to solve]

The document transport device consisting of the paper feed section, transport section, and paper ejection section is as follows:
Power is transmitted by one drive source, and the document is conveyed in one direction from the paper feed tray to the paper output tray.

In other words, after the trailing edge of the first original is ejected,
Since a serial processing operation is performed in which the leading edge of the next second document is fed, processing time is wasted when the document is conveyed. In order to reduce this loss time, it is possible to reduce processing time by using multiple drive sources that can be controlled separately and partially overlapping paper feeding, transport, and paper ejection operations. However, this is difficult to implement due to problems such as cost, space, reliability, and maintainability.

[Means for solving problems]

In view of the above points, the present invention improves a document conveyance device that can simultaneously realize thinness and improved maintainability, shortens the entire document conveyance device, and increases the number of documents that can be conveyed per minute.
Another object of the present invention is to provide a highly reliable document conveying device that has a simple structure, is compact, and has high reliability.

In order to achieve the above object, the document conveying device of the present invention includes a paper feed section that feeds each document placed on a paper feed tray toward the document table of the document exposure section; a document transport section that transports the originals fed from the paper feed section; and a paper eject roller that transports the originals that have undergone exposure processing in cooperation with the document transport section and onto the paper ejection tray. In the document conveying device, the document conveyance device has a structure in which the document discharge roller has a built-in one-way clutch for preventing reverse rotation, and the drive motor is reversely rotated when the document is fed into the document feed section, Next, the drive motor is rotated in the normal direction to transport the document onto the document table, and then, before the document is ejected when the motor is rotated in the normal direction, the reverse rotation of the document ejection roller is prevented and the second document is transferred. It is characterized by being configured so that it can be sent.

〔Example〕

The present invention will be described below with reference to an embodiment shown in the accompanying drawings.

FIG. 1 is a sectional view of a document conveying device according to the present invention, FIG. 2 is a drive system diagram of the entire document conveying device, and FIG. 3 is a plan view of a paper ejection roller and its drive system.

In these figures, IO is the main body of the copying machine, 11 is a platen glass, 12 is a document rear end stopper plate (abutment plate), and the document conveyance device 100 is mounted above the platen glass 11. The document conveyance device 100 is attached to a hinge portion at the top of the copying machine main body 10 and has a swingable structure, so that the top surface of the platen glass 11 can be opened and closed. The document conveyance device 100 includes a paper feed section 200, a conveyance section 300,
It is composed of three main parts: 1 discharging part 400.

The document conveying device 100 is provided with a paper feed tray at the top, which is composed of a foldable movable paper feed tray 102 and a fixed paper feed tray 103 fixed to the housing main body 101, both of which are inclined. Document paper can be placed in a stacked manner on the paper tray, and the leading edge of the document paper is inserted into the paper feed section 200. Further, a paper width regulating plate 104 is provided on the fixed paper feeding tray 103 so as to be movable in the width direction for regulating the width when setting the document tray.

The fixed paper feed tray 103 has a concave cutout near the center on the downstream side in the paper feed direction, and a movable guide plate is installed in the concave cutout so that it can swing vertically from the upper surface of the fixed paper feed tray 103. It has become. The movable guide plate 105 is connected to a solenoid (not shown).

On the other hand, above the movable guide plate 105, a delivery lever 201 is swingably supported. That is, one end of the shaft of the feed lever 201 is rotatably supported above the paper feed port 106 of the housing body lot, and the other end is lowered by the weight of the feed lever 201 to press against the upper surface of the document tray.

When feeding a document, the movable guide plate 105 is in a raised position and is stopped slightly above the outer circumferential upper surface of the feed roller 212. In this state, the movable paper feed i 102,
When a document tray is set on the fixed paper feed tray 103 and the document tray is pushed forward in the paper feeding direction, the leading edge of the document tray is pushed out along the upper surface of the movable guide plate 105, and
The feed lever 20 is supported upward and hangs down due to its own weight.
1 is pushed up and comes into contact with the outer circumferential surface of a double-feed prevention roller 213 and the lip of the housing body 101, which will be described later, and stops. FIG. 1 is a sectional view showing this document set state.

When the solenoid is energized in response to a paper feed start signal, the movable guide plate 105 is swung and its leading end is lowered and submerged from the upper surface of the fixed paper feed tray 103.

Next, a paper feed unit 200 provided on the left side of the document transport device lOO (FIG. 1) on the downstream side of the paper feed tray feeds the stack of documents inserted from above the paper feed tray, and further A sending means (first paper feeding means) for separating and sending out the original sheets one by one from the bottom layer, and a copying machine main body 10 for transporting the separated document sheets one by one.
and a second sheet feeding means for feeding the sheet onto the platen glass 11 of the printer.

This feeding means includes a feeding roller (first paper feeding roller) 212 loosely fitted into the center of the first drive shaft 210 and driven by the second driving shaft 211;
The double-feed prevention roller 213 is pivotally supported by a double-feed prevention roller mounting plate 214 provided diagonally above the double-feed prevention roller.

FIG. 2 is a drive system diagram of the entire document conveying device.

The drive shaft of the main motor 215 includes gears 216 and 217, timing pulleys 218 and 219, and a timing belt 22.
0, gear 221 coaxial with timing pulley 219, second
The second drive shaft 211 is rotated via a gear 222 that is integral with the drive shaft 211 . A gear 22 with a built-in one-way clutch 223 is provided at one shaft end of the second drive shaft 211.
It has 4. This gear 224 is connected to the first riA moving shaft 2
It meshes with a gear 225 that is integral with the feed roller 212 that is loosely fitted to the roller 10 . In other words, with respect to the main motor 215 which rotates in forward and reverse directions, the feed roller 212 loosely fitted to the first drive shaft 210 rotates by receiving power from the second drive shaft 211 only when the main motor 215 rotates in the reverse direction.
When the main motor 215 rotates normally, no power is transmitted to it and it rotates freely.

On the other hand, on the axis of the second drive shaft 211, second paper feed rollers 226 and 2 are provided on both sides of the feed roller 212, respectively.
26 is fixed to the shaft and rotates together with the drive shaft.

Further, near the shaft end of the first drive shaft 210, two gears 227 and 228 having a built-in directional clutch and a shaft-locked gear 229 are respectively attached.

On the other hand, a gear 230 is fixed to the shaft end of the second drive shaft 211, and the gear 230 meshes with a gear 227 at the shaft end of the first drive shaft 210 via an idler gear 231.

Thus, the first drive shaft 210 and the second paper feed rollers 226 and 226 integral therewith have the function of constantly rotating in the paper feeding direction in response to the forward and reverse rotations of the main motor 215.

A gear 229 fixed to the first drive shaft 210 is connected via an idler gear 232 to a third drive shaft (torque limiter shaft) 234 having a gear 233 fixed to one shaft end.
power is transmitted to. A gear 236 having a torque limiter 235 is provided at the other shaft end of the third drive shaft 234 . The gear 236 meshes with a gear 238 which is integral with the double feed prevention roller 213 via an idler gear 237. The double feed prevention roller 213 is pressed against the feed roller 212 with a predetermined pressure to form a nip.

As described above, the first drive shaft 210 rotates in one direction regardless of whether the main motor 215 rotates in the forward or reverse direction, and the double-feed prevention roller 213 coupled to the first drive shaft 210 through gears can also rotate in one direction.

A second paper feed roller 226 is fixed to the first drive shaft 210 that loosely fits and supports the feed roller 212 during document feeding by the feed cooler 212 and the double feed prevention roller 213.
．． The feed roller 226 also rotates at the same speed and in the same direction as the feed roller 212, and plays an auxiliary role in feeding the document in a U-turn.

The second paper feeding means of the paper feeding means 200 is connected to the first drive shaft 21.
It consists of two second paper feed rollers 226, 226 fixed to both sides of the feed-out row 2212 which is loosely fitted into the feed roller 2212, and a driven roller 240 which is pressed against the lower surface side of the rollers 226, 226 so as to be rotatable. There is.

The second paper feed roller 226, 226 has a slightly larger diameter than the feed roller 212, can be driven independently from the feed roller 212, and is furthermore
2 rotates in the same direction so as not to interfere with the feeding of the original document.

The driven roller 2
A document detection sensor 241 is provided near the pressure contact position 40 . The document detection sensor 241 turns ON when the leading edge of one document separated and sent out at the nip position among the document bundle passes, and turns ON when the trailing edge of the document passes.
It is designed to be FF.

When the document detection sensor 241 detects the leading edge of the document, the solenoid is turned off after a certain period of time after generating the detection signal.
N to operate each member of the link mechanism and lower the movable guide plate 105.

At the same time, the main motor 215 shifts from reverse rotation to forward rotation. (No rotation is transmitted to the gear 228 that incorporates a directional clutch), the first drive shaft 210 continues to rotate in the same direction, and the second paper feed roller 226 fixed to the shaft 210 also continues to rotate in the same direction. Rotate.

However, as the main motor 215 shifts to forward rotation, the second drive shaft 211 also shifts from reverse rotation to forward rotation, but the gear 224 is freed by the one-way clutch 223 provided at the shaft end of the second drive shaft 211. As a result, rotation is no longer transmitted to the gear 225 that meshes with the gear 225 and the delivery roller 212 that is integral with the gear 225.

Here, when the leading edge of the document is pressed and held between the second paper feed roller 226 and the driven roller 240, the feed roller 212 rotates seven times and the second paper feed roller 226 rotates forward.
The document paper tightly wound around the paper feed roller 212 is driven to rotate in the paper feeding direction.

Note that since the first drive shaft 210 continues to rotate in the normal direction, the double-feed prevention roller 213 continues to rotate in the normal direction to prevent double feeding of the second and subsequent documents and return them. Further, the second paper feed roller 226 continues to rotate after that, and the separated paper feed roller 226 continues to rotate.
The original sheets are successively fed to the transport section 300.

The conveyance unit 300 is for conveying a document on the platen glass 11, and includes a white sheet member 304 and document conveyance rollers 301, 302, and 303 as main components. Note that the conveyance unit 300 may be an endless conveyance belt. The white sheet member 304 is used to press the document during exposure, and is made of a plastic material with excellent solid lubricating properties (in this embodiment, PET=polyethylene terephthalate), and completely covers the upper surface of the platen glass. The white sheet member 304 has its end on the paper feed section 200 side connected to a torsion coil spring, and its end on the paper discharge section side connected to the fixing part 101a of the housing body 101, respectively. In addition, at appropriate locations along the center line of the white sheet member 304,
Three through holes 304a are provided, and the cumulative conveyance roller 301
, 302° and 303 end portions protrude.

The cumulative conveyance rollers 301, 302, and 303 are for conveying the yK document on the platen glass 11, and are used to convey the yK document on the platen glass 11.
A total of three through holes 304a are provided on the back side of the white sheet member 304 so that the document can be rotated and conveyed by frictional force while being pressed through the holes 304a.

The surfaces of the rollers 301, 302, and 303 are covered with an elastic material having a large frictional force (for example, a rubber or plastic sponge), and the ends thereof are in contact with the surface of the platen glass 11 through the through holes 304a. Further, the document conveying rollers 301, 302, and 303 can be rotated in forward and reverse directions so that the final position of the document tray can be finely adjusted during exposure.

The main motor 215 is connected to the paper feed section 200 and the conveyance section 3.
00 is driven at the same time. That is, the gear 216 that is integrated with the main shaft of the main motor 215 is connected to the conveyance drive section 310 via a gear train to rotationally drive a drive shaft (station shaft) 311. A gear 31 is attached to one shaft end of the drive shaft 311.
6, a timing pulley 317 is fixed near the other shaft end. The gear 316 meshes with a gear 320 having a smaller diameter. The small-diameter gear 320 is integral with a large-diameter gear 321, and the gear 321 meshes with the gear 216, which is integral with the motor shaft of the main motor 215.

In this way, the driving rotational force of the main motor 215 is transmitted to the gear train 21.
6.321.320.316, and the drive shaft 3
Rotate 11.

A timing pulley 317 fixed to the shaft end of the drive shaft 311
has toothed boob portions at two locations on both ends, and can be rotated by winding timing belts 322 and 323 respectively.

A first conveyance roller section 330 is disposed on the feeding upstream side of the driving conveyance section 310 with a timing belt 322 interposed therebetween. In addition, a timing belt 323 is provided on the downstream side of the feed.
A second conveyance roller section 340 is disposed via a timing belt 324, and a third conveyance roller section 350 is disposed further downstream on the feeding side via a timing belt 324.

A timing pulley 331 is fixed to the center of a rotating shaft 301a that is integral with the document transport roller 301. Both rotational shafts of the timing pulley 331 are rotatably supported by bearings. Both ends of the rotating shaft are biased by springs, and press the outer circumferential surface of the document transport roller 301 against the surface of the platen glass 11.

The first conveyance roller section 330 configured in this way is pressed against the platen glass 11 and is also pressed against the timing belt 32 wound around the timing pulleys 317 and 331.
Drive is transmitted by 2.

The document conveyance roller 302 of the second conveyance roller section 340 is similarly biased by the spring, and the timing belt 3
23 rotates the timing pulley 341 and transmits the mouth expansion.

The document transport roller 303 of the third transport roller section 350 is
The above timing pulley 341 and timing belt 324
The timing pulley 351 receives the driving force of the timing pulley 351, and is rotated together with the timing pulley 351. The spring biasing force also presses the conveyance roller 303 to apply pressure to the platen glass 11 side in the same manner as described above.

Next, the structure and drive system of the paper discharge section 400 will be explained with reference to FIGS. 2 and 3.

401 401 is a paper ejection roller, which is integrated with the rotating shaft 410. Pinch rollers 402.402. below (near the introduction opening) are attached to the left and right paper ejection rollers 401.401. and the pinch roller 403°40 above (near the discharge opening)
3 are supported by mounting plates 408 and 409, respectively, and are urged by a spring and are in pressure contact with the above-mentioned paper ejection roller.

Near both ends of the rotating shaft 410, paper discharge guide rollers 411. 411 is loosely fitted and rotatable.

Both shaft ends of the rotating shaft 410 are attached to a mounting plate 4 having bearings 412.
It is rotatably supported by 13.

A one-way clutch 4 is provided at one end of the rotating shaft 410.
A gear 415 having a built-in gear 14 is attached. The gear 415 is connected to an idler shaft 417 embedded in an adjustment plate 416.
The gear 418 is inserted into the shaft and meshes with the rotatable gear 418. The gear 4
A timing belt 420 is wound around a timing pulley 419 that is integral with the timing belt 18 and rotates. The other timing pulley 421 that rotates in mesh with the timing belt 420 is connected to an idler shaft 423 embedded in a mounting plate 422.
It is fitted into and rotatably supported. The timing pulley 421 is a gear 320.3 of the drive system of the conveying section 300.
21 and is driven and rotated by a main motor 215 via a gear 216.

Next, FIG. 4 (
This will be explained using the document conveyance process explanatory diagrams A) to (F) and the time chart of FIG.

First, a document is placed on a paper feed tray consisting of a fixed paper feed tray 103 and a movable paper feed tray 102 with the recording surface facing upward, and the leading edge of the document is inserted into the feed section at the frontage of the paper feed section. do. Note that for convenience of explanation, the operation of transporting two original documents Dr and Dx will be described.

(A) First Paper Feed When the copy button is pressed in this state, the solenoid is energized by the paper feed start signal to lower the tip of the movable guide plate 105, and at the same time, the main motor 215 starts rotating in reverse. Due to the reverse rotation of the main motor 215, the stacked originals, D, are transported to the feed roller (first paper feed roller) 2.
12 and the feed lever 201 and sent out.
At the nip position between the feed roller 212 and the double-feed prevention roller 213, the upper document D8 is returned, and only the lower document D□ is separated and fed.

CB) When the leading edge of the second fed document passes the document detection sensor 241,
150m5 after the detection signal, turn off the solenoid.
Then, the movable guide plate 105 is returned upward, and the main motor 215 is switched from reverse rotation to normal rotation. As a result, the feed roller 212 becomes free to rotate, and the second paper feed roller 226 is driven to rotate and the driven roller 2 that presses against it.
40, the document slides on the upper surface of the abutting plate 12, reaches the platen glass 11, and the white sheet member 30
The sheet member 304 slides while passing through the gap with the sheet member 304.
The document is conveyed under pressure by document conveyance rollers 301, 302, and 303 which are driven and rotated through the through hole 304a of the document sheet and moved forward.

(C) *When the rear end of the document abutting document passes the document detection sensor 241, after counting up 45 pulses from the generation of the detection signal, the main motor 215 is switched from reverse rotation to forward rotation. At the start of this switching, the rear end of the document feeder is on the right side of the stopper surface of the abutting plate 12, but due to the reverse rotation of the main motor 215, the document conveyance roller
01, 302, and 303 are driven and rotated clockwise to move the original document back and bring it into contact with the stopper surface of the abutting plate 215. Further, after counting up 45 pulses and counting 28 more pulses, the white sheet member 304 is lowered by the swing-back plate section (see (E) in FIG. 2) driven by the main motor 215, and Since the gap with the plate 12 is closed, the document will not jump over the abutment plate 12 and return to the paper feed section 200 side. Further, the original document is pressed against the platen glass 11 by the white sheet member 304 and is brought into close contact with the platen glass 11. Exposure is performed while the document D1 is stopped and in close contact.

(D) Start of Paper Discharge When the exposure described above is completed, the main motor 215 is switched from reverse rotation to forward rotation again. As a result, the conveyance roller 3
01, 302, and 303 rotate in the normal direction and eject the document from the paper ejection section 4.
Send in the direction of 00. The leading edge of the document passes through a guide plate, passes through a nip position between a paper ejection roller 401 that rotates normally, and a pinch roller 402 that comes into pressure contact with the paper ejection roller 401, and then passes through a paper ejection section 40.
It passes through the detection position of the paper discharge sensor 404 provided in the conveyance path of No. 0. Due to the generation of this document leading edge detection signal, the main motor 215 is switched from normal rotation to reverse rotation, but due to the inertia of the normal rotation of the main motor 215, the document D1 moves forward.
It passes through the nip position between the paper discharge roller 401 and the pinch roller 403, reaches near the paper discharge opening, and stops.

(E) Paper ejection - Due to the time stop and the reverse rotation of the first paper feed main motor 215, the conveyance roller 301°3
02 and 303 reverse and attempt to move back the vicinity of the rear end of the document D1 which is clamped under pressure.

On the other hand, since the one-way clutch 414 is provided at the shaft end of the paper ejection roller 4Dl, when the main motor 215 reverses rotation, it is locked and rotation is stopped.

At this time, the paper ejection roller 40 of the pinch rollers 402 and 403
If the pressing force to 1 is set to be strong, the vicinity of the tip of the document holder will be strongly held by these rollers, and the document will be removed by the reverse rotation of the transport rollers 30, 302, and 303.
It overcomes the backward force of the rear end and holds the i drafter in a forced stop state.

Also, when the main motor 215 is reversed, the paper feed section 2
00, the conveyance section 300 is in a state similar to that shown in FIG. 4(A), the feed roller 213 rotates normally, and the next document D2 passes through the nip position with the double feed prevention roller 213 and is fed. That is, during the process of discharging the first document D1, the second document D2 is fed and the first document feeding starts.

(F) Resuming paper ejection and second paper feeding When the leading edge of the second document D2 passes the document detection sensor 241, the main motor 215 is switched from reverse to forward rotation, and the document is fed as in FIG. 4(B). The document DI is conveyed from the second paper feeding position toward the platen glass 11, and the document DI is discharged and conveyed by the normal rotation of the paper discharge roller 401 and the conveyance rollers 301, 302, and 303, and is ejected from the paper discharge opening to be externally discharged. Place it on a paper plate 406. Second manuscript D of immersion
2, the conveyance and discharge operation is repeated in the same manner, and the paper discharge tray 4 is sequentially
Loaded on 06.

In the above embodiment, the main motor is reversed in the process shown in FIG. The present invention can also be applied to a document conveyance device having a structure in which the leading edge of the document abuts a movable abutment plate on the downstream side of conveyance at one end of a platen glass while the motor continues to rotate normally.

〔Effect of the invention〕

As mentioned above, the document feeder of the present invention is a roller feeder type document feeder that has realized a thinner device and improved maintainability. Since this feature is characterized in that the documents are overlapped so as to start feeding, it is possible to shorten the conveyance interval between each document and increase the number of documents conveyed per unit time. Further, the increase in cost for implementing this device is kept to a minimum, and the device operates more stably and is highly effective in improving reliability.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the document conveying device according to the present invention, FIG. 2 is a drive system diagram of the entire document conveying device, FIG. 3 is a plan view of the paper ejection roller and its drive system, and FIG. 4 is a diagram of the document conveying device according to the present invention. FIG. 5, which is a diagram illustrating the operation process of the document conveying device, is a time chart thereof. DESCRIPTION OF SYMBOLS 11...Platen glass (original platen) 12...Abutting plate 100...Document transport device 101...Housing body 102...Movable paper feed tray 103...Fixed paper feed tray 1
05... Movable guide plate 200... Paper feeding section 201.
...Feeding lever 212...Feeding roller 213...Double feed prevention roller 215...Main motor (drive source) 241...yK detection sensor 300...Transportation section 301, 302, 303... Kindness conveyance roller 304・
... White sheet member 400 ... Paper discharge section 401 ... Paper discharge roller 4
02.403... Pinch roller 404... Paper discharge sensor 406... Paper discharge tray 414
...One-way clutch

Claims (1)

[Claims] a paper feed unit that feeds the originals placed on the paper feed tray one by one toward the original platen of the original exposure unit; In the document transport device, the document transport unit includes a document transport unit that transports the original, and a paper discharge unit that works in cooperation with the document transport unit to transport the document that has undergone exposure processing, and discharges the document onto the paper discharge tray by a paper discharge roller. The paper roller has a structure in which a one-way clutch for preventing reverse rotation is built in, and when the document is fed into the paper feed section, the drive motor is reversely rotated, and then the drive motor is rotated forward to convey the document onto the document table. , and then, before the document is completely ejected when the motor rotates forward, reverse rotation of the paper ejection roller is prevented and a second document is fed.