JPH02110043A - Manuscript carrying device - Google Patents

Abstract

PURPOSE:To simultaneously prevent the relief of both the ends of a manuscript by providing the sheet pressing means, which is in a sheet discharge side and making the gap between a sheet member and a manuscript base possible to be opened/closed, with one end, in the sheet discharging means side of a sheet member, pressed to the manuscript base. CONSTITUTION:The rear end of a manuscript D which is sent back on a platen glass 11 is pressed and closely touched to the glass 11 with a sheet member 304. On the other hand, when the member 304 is extendedly provided downward by the pressing drive of the sheet pressing plate 342 in a sheet feeding side a right end part 304b is pulled to a sheet feeding side, a sheet pressing plate 351, which is in a sheet discharging side and incorporated into the part 304b, is rotated in a clockwise direction, and the tip vicinity of the bent surface part of the plate 351 nears the glass 11 to be advanced and stopped until the member 304 is closely touched to the glass 11. In the stopped condition, the vicinity of the right end part of the member 304 is closely touched and pressed to the glass 11 by the spring pressure of the plate 351, and the manuscript D which is at a standstill on the glass 11 is made to closely adhere without relief to retain flatness.

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]

In general, this type of document conveying device includes a document storage section (paper feed tray) disposed on the side of a document table, and a document feeding tray from which documents are fed one by one toward the document table. a feeding means, which is disposed on the document table, transports the document fed from the document feeding device, positions the document at an exposure position on the document table, and when exposure of a predetermined number of sheets is completed, transfers the document to the document table; It is composed of a document conveying 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.

This document conveying device was equipped with document conveying means for pressing a document against the platen glass surface of a copying machine with a white endless belt and conveying 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 frictional force with appropriate places on the surface of the document due to slight slack in the endless belt. For this reason, ■ Sufficient space in the thickness direction is required for the belt to rotate, which increases the overall height of the device and makes it larger.

■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 inventor has previously proposed an original document conveying device which improves the above-mentioned problems and makes the device thinner and easier to maintain at the same time (Japanese Patent Application No. 63-3341).

The document conveying device of the present invention is provided with a document holding sheet member (white fixed sheet member, hereinafter referred to as sheet member) along the platen glass surface in the device main body disposed on a copying machine, and provided at an appropriate position on the sheet member. A document conveying roller is brought into sliding contact with the entire platen glass surface through a through hole, so that the height of the entire apparatus is low and the document can be conveyed without using an endless belt.

In this document conveying device, the document is transported in a forward direction between the platen glass surface and the sheet member in the conveying section, and then the document is reversely conveyed and hits the document trailing end stopper plate (abutment plate). After positioning and stopping, exposure processing is performed. In order to prevent the document from slipping through the gap between the sheet member and the abutting plate and returning to the paper feed section during this reverse feeding, a sheet pressing means is provided that can open and close the gap. In addition, this sheet pressing means presses the rear edge of the original (on the paper feeding side) with a uniform force and exposes it to light, so the rear edge of the original lifts off the platen glass surface and a shadow image is formed on the copied image. The problem has been resolved.

[Problem that the invention seeks to solve]

However, even in such a document conveying device, the following problems exist. In other words, the edge of the sheet member near the leading edge of the original on the platen glass (discharge side) is slightly pulled up and stretched, and remains open so that the original can be transported. It rises freely from the surface or creates unevenness. When the original in this state is exposed and scanned, a shadow image is generated in the copied image or a distorted copied image is formed. As described above, it is difficult to simultaneously prevent both ends of the document from lifting up and completely remove the shadow image.

[Means for solving problems]

In view of the above-mentioned points, the present invention improves a document conveyance device consisting of the white sheet member and a rotationally driven document conveyance roller, which can simultaneously achieve a reduction in thickness and an improvement in maintainability. An object of the present invention is to provide a document conveying device that does not generate shadow images or image distortion due to lifting of the front and rear edges.

In order to achieve the above object, the document conveying device of the present invention includes a paper feeding means for feeding each document placed on a paper feed tray toward the document table of the document exposure section; A document conveyance means is disposed in the paper feed means and includes a document conveyance roller that conveys the document fed from the paper feed means and a white sheet member that presses the document against the surface of the document table; In a document conveyance device having a paper ejecting means that cooperates with a conveyance means to transport and eject a paper onto a paper ejection tray,
A paper feeding side sheet pressing means is provided for pressing one end of the white sheet member on the paper feeding means side against the document table to open and close a gap between the sheet member and the document table; A paper ejection side sheet pressing means is provided which presses one end of the sheet member on the paper ejection means side against the document table in response to the pressing means to open and close the gap between the sheet member and the document table. This is a characteristic feature.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a cross-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 cross-sectional view of the conveyance section of the document conveyance device, and FIG. 4 is a main part of the conveyance section. It is a perspective view showing a constituent member.

In these figures, 10 is a main body of the copying machine, 11 is a platen glass, 12 is a document trailing end stopper plate (abutment plate), and the document transport device +00 is mounted above the platen glass 11. The document transport device lOO is attached to a hinge portion at the top of the copying machine main body IO and has a swingable structure, so that the top surface of the platen glass 11 can be opened and closed.

The document conveying device 100 includes a paper feeding section 200, a conveying section 300,
The paper discharge section 400 is composed of three main parts.

The document conveyance device 100 has a paper feed tray slanted at the top, consisting of a foldable movable ring paper tray 102 and a fixed paper feed tray 103 fixed to the housing main body 101. Document paper can be placed in a stacked manner on the paper feed tray, and the leading edge of the document paper is inserted into the paper feed section 200. Ma? =, 104 is a paper width regulating plate for regulating the width of the document.

The stationary 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 105 is installed in the concave cutout so that it can swing vertically from the top surface of the fixed paper feed tray 103. It's free. 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, the shaft portion at one end of the feed lever 201 is connected to the housing body 101.
is rotatably supported above the paper feed port 106, and the other end is lowered by the weight of the feed lever 201 to press against the upper surface of the document tray.

w. When feeding a document, the movable guide plate 105 is in the raised position and is stopped slightly above the outer circumferential upper surface of the feed roller 212. In this state, the movable paper plate 102
When a document tray is set on the fixed paper feed tray 103 and pushed forward in the paper feeding direction, the leading edge of the document tray is pushed along the upper surface of the movable guide plate 105 and pushed upward. Feed lever 2 supported and hanging down due to its own weight
Double feed prevention roller 21 (described later) by pushing up the bottom surface of 01
3 and the lip of the housing body 101 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 feeder 100 and on the downstream side of the paper feed tray feeds the stack of documents inserted from above the paper feed tray, and then feeds the stack of documents inserted from the top of the paper feed tray. It is provided with a sending means (first paper feeding means) for separating and sending sheets one by one, and a second paper feeding means for feeding the separated documents onto the platen glass 11 of the main body IO of the copying machine.

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;
A 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 drive shaft 210.
A gear 2 that is integrated with a delivery roller 212 that is loosely fitted to the
It meshes with 25. That is, 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 being transmitted with power from the second drive shaft 211 only when the main motor 215 rotates in the reverse direction. When the motor 215 rotates in the normal direction, no power is transmitted and the motor 215 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.

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

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 roller 212 and double feeding 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 feed rollers 226, 226 fixed to both sides of the feed roller 212 which is loosely fitted into the feed roller 212, and a driven roller 240 which is pressed against the lower surface of the rollers 226, 226 so as to be rotatable. There is.

The second paper feed rollers 226, 226 can be driven independently of the feed roller 212, and
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 freely 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 row 2226 continues to rotate after that, and the separated paper feed row 2226 continues to rotate.
The original sheets are successively fed to the transport section 300.

The transport unit 300 is on the platen glass 11! ! It is for conveying the document D, and includes document conveyance rollers 301, 302, and 303 that press the document sheet to forward and reverse the document, drive means that drives the conveyance roller in forward and reverse directions, and a white document holding sheet member (hereinafter referred to as The main components include a sheet member (referred to as a sheet member) 304 and a sheet pressing means for pressing and releasing the sheet member 304.

The document conveyor rollers 301, 302, and 303 are for conveying the document on the platen glass 11. The document conveyor rollers 301, 302, and 303 are for conveying the document on the platen glass 11. The document conveyor rollers 301, 302, and 303 are for conveying the document on the platen glass II. Holes 305, 306, 30
This is provided to correspond to 7. The rollers 301 and 302
, 303 are covered with an elastic material having a large frictional force (for example, a rubber or plastic sponge body), and the ends thereof are in contact with the surface of the platen glass 11 through through holes 305, 306, and 307. In addition, the document transport roller 301
302 and 303 are capable of forward and reverse rotation 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 drive rotational force of the main motor 215 is transmitted through the gear trains 216, 312, 313, and 314 to rotate the drive shaft 311.

A timing pulley 31 fixed to the shaft end of the drive shaft 311
5 has toothed pulleys at two locations on both ends, and timing belts 316 and 317 are wound around the pulleys, respectively, so that the document transport roller 301 of the first transport roller section 301O and the document transport roller 302 of the second transport roller section 3020 are moved. The conveyance roller 302 is made rotatable. In addition, the third conveyance roller section 3030
The document conveyance roller 303 is connected to the second conveyance roller section 302.
Driving force is transmitted from the timing belt 318 to the timing belt 318, and the rotation is possible. Note that both ends of these document conveyance rollers 301, 302, and 303 are biased by springs, and the outer peripheral surface of the document conveyance roller 301 is pressed against the surface of the platen glass 11.

The sheet member 304 is used to press the document during exposure, and is made of a plastic material with solid lubricity (PET-polyethylene terephthalate in this embodiment), and completely covers the upper surface of the platen glass. The sheet member 3
04 is completely opaque white, and its whiteness is at a density of 0.
06 or less.

In addition, at appropriate locations along the center line of the sheet member 304,
Through holes 305, 306, and 307 are provided so that a portion of the cylindrical circumferential surface of the document transport rollers 301, 302, and 303 protrudes.

Left end 304a of the sheet member 304 on the paper feed unit 200 side
is adhesively fixed within the bent portion of the sheet retaining plate 321. Both protruding ends of the sheet stopper plate 321 are connected to the paper feed section 2.
It is fixed to the frame of 00 with screws.

FIG. 5 is a plan view showing the drive system of the sheet pressing means that presses and releases the vicinity of the left end portion 304a of the sheet member 304, and is a detailed view of the swingback plate portion (E) in FIG. 2 and its surroundings. .

In the figure, a gear 216 fixed to the drive shaft of the main motor 215 is a gear 217 of the first intermediate shaft. A timing belt 220 rotates a timing pulley 219 of the second intermediate shaft and a gear 221 via a timing pulley 218 .

The gear 221 meshes with a gear 3301 which is spring-coupled with a spring clutch 330 fixed to a third intermediate shaft 331. The spring clutch 330 is used to maintain the contact state when a paper feed-side sheet suppressing plate 342 (described later) contacts the abutting plate 12 and to prevent excessive load from being applied thereto.

A gear 334 that is integral with the intermediate shaft 331 meshes with a gear 340 fixed to the shaft end of a pressing drive shaft 341 via an idler gear 337.

Both shaft ends of the pressing drive shaft 341 are fitted into bearings 339 and 339 and are rotatably installed. The pressing drive shaft 34
A seat pressing plate 342 (swingback plate) is fixed to 1 with screws.

The sheet pressing plate 342 has the same width as the sheet member 304, and has the same width as the sheet member 304 so that the vicinity of the left end 304a of the sheet member 304 can be pressed toward the abutting plate 12 with a uniform force, as shown in FIG. It has a trough-like shape with a U-shaped cross section and a smooth convex curved surface on the contact side. The three protruding plane parts at the upper part of the sheet pressing plate 342 are screwed to the pressing drive shaft 341 with machine screws.

The sheet pressing plate 342 is formed by pressing a thin spring plate, and when it is folded down, the plate material is
Stainless steel plates, phosphor bronze plates, beryllium bronze, etc. of about 0.2 to 0.31 are used.

The sheet pressing plate 342 can uniformly press the entire length of the tip of the abutting plate 12 via the sheet member 304 when the sheet pressing plate swings, which will be described later.

On the other hand, the right end portion 304b of the sheet member 304 on the side of the paper discharge section 400 is wound around the outer periphery of a sheet pressing plate (swingback plate) 351 of the sheet pressing means 350 on the paper discharge side and fixed with adhesive.

FIG. 6 is a partially enlarged perspective view of the sheet pressing means 350 on the discharge side.

The sheet pressing plate 351 is the sheet pressing plate 3 on the sheet feeding side.
It is formed by pressing a thin spring plate in the same way as 06.
A stainless steel plate, a phosphor bronze plate, a beryllium bronze plate, or the like with a thickness of about 2 to 0-3 mm is used.

The sheet pressing plate 351 has the same width as the sheet member 304,
Moreover, it has a trough-like shape with a U-shaped cross section and a smooth convex curved surface on the side in contact with the sheet member 304. The convex curved surface can uniformly press the entire surface of the platen glass 11 via the sheet member 304 when the sheet pressing plate swings (see FIG. 7(B)). Further, the convex curved surface allows the sheet pressing member 351 to separate from the surface of the platen glass 11 when the sheet pressing plate 351 rotates in the opposite direction,
It is maintained at a predetermined parallel gap (see FIG. 7(A)).

The three protruding plane parts at the upper part of the sheet pressing plate 342 are as follows:
It is screwed onto the pressing driven shaft 352 using a machine screw. The pressing driven shaft 352 is attached to a bearing portion 353A of the holding member 353.
It is pivoted and can rotate freely. Further, a torsion spring 354 is fitted in the pressing driven shaft 352, one end of which is locked in a notch in the housing body 101, the other end is locked in a part of the seat pressing plate 351, and the The pressing plate 351 is biased by a spring so that the sheet member 304 is always separated from the platen glass 11.

Next, the operation of the document conveyance section of the document conveyance device of the present invention will be explained. In FIG. 7, both the sheet feeding side sheet pressing plate 342 and the sheet discharging side sheet pressing plate 351 are connected to the platen glass 1.
1 is an enlarged cross-sectional view showing a separated state of the sheet member 304 after retracting from the surface of FIG.

From the document stack on the paper feed section 102, 103, the paper feed section 20
During the sequential conveyance of documents, in which one document sheet is fed at 0, the main motor 215 rotates in the normal direction, and the gear 216.degree.
17, the gear 3301 in the spring clutch 330 rotates normally through the timing pulleys 218 and 219, the timing belt 220, and the gear 221.

Due to this forward rotation, the spring clutch 330 is integrally rotated forward via the coil spring 3304, and the cam 3302
The intermediate shaft 331 that is integral with the press drive shaft 341 rotates in the normal direction through a gear train (334°338.340).

That is, the spring clutch 330 and each gear rotate, and the seventh
As shown, the sheet pressing plate 342 is swung upward,
It becomes a stopped posture at the upper position.

As a result, the sheet member 3 is held by the sheet retaining plate 321 and comes into contact with the convex curved surface of the gutter-like portion of the sheet pressing plate 342.
The left end 304a of 04 is the right end 3 of the sheet member 304.
The sheet is pulled up above the platen glass 11 and the abutting plate 12 by the spring biasing force of a torsion spring 354 that is engaged with a sheet pressing plate 351 that is integral with the sheet pressing plate 351. At this time, the sheet pressing plate 35 on the paper discharge side
1 is rotated counterclockwise by the tension of the torsion spring 354, and the lower end of the curved surface portion of the sheet pressing plate 351 is
It is spaced apart from the surface of the platen glass 11.

Therefore, a space is created between the upper side of the abutment plate 12 and the lower surface of the sheet member 304, and the document fed from the paper feed section 200 is fed toward the platen glass 11 through this space. . Further, a gap is also created between the stretched sheet member 304 and the platen glass 11, and the document passes through the space above the abutment plate 12 and slides on the platen glass 11, and is then continued to be transported by the transport section 300. Rollers 301, 302
, 303, the trailing edge of the document being fed while sliding on the platen glass 11 passes the document detection sensor 241, generates a trailing edge detection signal, and then counts some pulses. The rear end is the document rear end stopper (abutment plate)
Pass 12.

When this number of pulses is counted up, the main motor 2
15 is changed from normal rotation to reverse rotation, and the document conveying roller 3
01, 302, and 303 are reversed to move the document tray slightly backward. This reverse rotation of the main motor 215 simultaneously drives the gear train of the swingback plate (E). That is, due to the reverse rotation of the main motor 215, the gear 3301 of the spring clutch 330 rotates in the reverse direction via the paper feed unit drive transmission system (F). The gear 3301 that rotates in the opposite direction is the coil spring 3
By rotating the cam 3302 in the reverse direction via the cam 304, the intermediate shaft 331 that is integral with the cam 3302 is reversely rotated. As a result, the pressing drive shaft 341 rotates in the opposite direction, and the sheet pressing plate 342 presses the sheet pressing member 304 to come into contact with the upper surface of the abutting plate 12.

FIG. 8 is an enlarged sectional view showing a state in which the sheet member 304 is brought into close contact with the platen glass 11 side by the pressing operation of both the sheet pressing plates 342 and 351.

Subsequently, as the main motor 215 continues to rotate in the reverse direction, the gear 33 old is driven to rotate, but the gear 334 continues to rotate slightly due to the tightening rotation of the coil spring in the spring clutch 330. As a result, the pressing drive shaft 341 also continues to rotate slightly, and the sheet pressing plate 342 presses the upper surface of the abutment plate 12 somewhat strongly via the sheet member 304, so that
The gap between the sheet member 304 and the abutting plate 12 is reliably closed (see FIG. 8).

Therefore, the rear end of the document that has been reversely fed on the platen glass 11 will not jump over the abutment plate 12 and return to the paper feed section 200 side. Further, the rear end of the document is pressed against the platen glass 11 by the sheet member 304, and the rear end of the document is not lifted up, so that a good exposure condition is achieved.

Further, when the sheet pressing plate 342 is in contact with the abutting plate 12, the spring clutch 330 is activated and no constant torque load is applied.

On the other hand, when the sheet member 304 is stretched downward by the pressing drive of the paper feeding side sheet pressing plate 342, the sheet member 304
The right end portion 304b of the sheet press plate 351 on the paper discharge side, which is integrated with the right end portion 304b of the paper sheet 304b, is rotated clockwise. 11, the sheet member 304 advances until it finally comes into close contact with the platen glass 11, and then stops.

In this stopped state, the right end portion of the sheet member 304 is closely pressed against the platen glass 11 due to the spring pressure of the sheet pressing plate 351.
The original document stationary above is kept in close contact with the sheet member 304 without lifting up due to the close pressing force of the sheet member 304, and its flatness is maintained.

Furthermore, since the pressing plate 351 is made of an elastic material and a thin elastic member having an elastic shape, the sheet member 304
Even if there is an error in the assembly relative parallelism of the pressing driven shaft 352, the sheet member 304 can be completely tightly closed over the entire area of the document tray.

The rear end of the original document comes into contact with the abutting plate 12 and stops, and while being pressed by the sheet member 304, exposure scanning and image forming processing of the original document are started in the copying machine main body IO.

When the exposure scan is completed, the main motor 215 rotates in the normal direction again, the document transport rollers 301, 302, and 303 rotate in the normal direction, and the pressing drive shaft 341 and the sheet pressing plate 342 on the paper feeding side rotate counterclockwise. In conjunction with this, the sheet pressing plate 351 on the paper discharge side also rotates counterclockwise via the sheet member 304 to release the pressure on the sheet member 304, so that the sheet member 304 presses against the platen glass 11.
This allows for smooth document transport. At the same time, the gap on the abutment plate 12 is also opened, making it possible to feed the next document.

After exposure, the document passes through the conveyance section 300 and is delivered to the paper ejection roller 401 and pinch rollers 402.4 of the paper ejection section 400.
03, the paper is ejected by being pressed and clamped by the paper ejection tray 4.
06.

When the leading edge or the trailing edge of the original document is detected by the sheet ejecting sensor provided in the conveyance path of the sheet ejecting section 400, the feeding operation for the second and subsequent original sheets is repeated in the same manner as described above.

〔Effect of the invention〕

As mentioned above, the document conveyance device of the present invention is a roller conveyance type document conveyance device that has realized a thinner device and improved maintainability, and has a fixed sheet member that presses the document against the platen glass surface. The vicinity of the end on the side of the paper sheet and the end on the side of the sheet discharge part are simultaneously pressed against the platen glass 11 by two elastic sheet pressing means, respectively.
The sheet member can be pressed against the entire surface of the document, including the trailing edge and leading edge of the document, without any gaps, and this presses against the raised edges of the document, making the flatness accurate and stable, and transferring it to the recording paper. The image forming position has also become more accurate.

In particular, the leading edge of the document no longer appears raised, and the occurrence of shadow images at the leading edge of the recording paper has been eliminated.

Furthermore, since the sheet pressing plate elastically abuts against the abutment plate, there is no mechanical impact noise, and no solenoids are used, so the sheet presser operates smoothly and generates no noise. Moreover, the structure is simple and the drive is reliable, providing excellent effects.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a document conveying device according to the present invention, FIG. 2 is an overall drive system diagram of this document conveying device, FIG. 3 is a cross-sectional view of the conveyance section of the document conveyance device, and FIG. 4 is a cross-sectional view of the conveyance section of the document conveyance device. 5 is a plan view showing the drive system of the sheet pressing means, FIG. 6 is a partially enlarged perspective view of the sheet pressing means on the discharge side, and FIGS. 7 and 8 are sheet pressing means. FIG. 3 is an enlarged cross-sectional view showing the operating state of the plate and sheet member. 10...Copying machine main body 11...Platen glass ([stacking table]) 12...Document rear end stopper (abutting plate) 100...
Document conveyance device 200...Paper feeding section (paper feeding means) 300...Conveyance section (document conveyance means) 301, 302.303...Document conveyance roller 304.
・・Document holding sheet member (sheet 321 ・sheet stop plate 330 ・spring clutch 341 ・press drive shaft 342 ・sheet feed side sheet press plate 350 ・sheet discharge side sheet press means 351 ・...Sheet pressing plate 352...Press driven shaft 353...Holding member 354...Torsion spring D...Document

Claims (1)

[Claims] a paper feeding means for feeding the originals placed on a paper feeding tray one by one toward the original table of the original exposure section; A document conveyance means consisting of a document conveyance roller that conveys the document and a white sheet member that presses the document against the surface of the document table, and the document that has undergone exposure processing is conveyed in cooperation with the document conveyance means and discharged onto the paper output tray. In the document conveying device having a paper ejecting means, a paper feeding side sheet pressing means that presses one end of the white sheet member on the paper feeding means side against the document table to open and close a gap between the sheet member and the document table. and a paper ejector that presses one end of the sheet member on the paper ejecting means side against the document table in response to the sheet pressing means on the paper feeding side, thereby opening and closing the gap between the sheet member and the document table. A document conveying device characterized in that a side sheet pressing means is provided.