JPH0228442A - Paper document conveying device - Google Patents

Abstract

PURPOSE:To eliminate deflection of a rotary shaft of a conveying roller by providing a rotating force transmitting pulley or gear at the central portion of a rotary shaft for each copy conveying roller as an integral part of it, installing a bearing member at the ends of the rotary shaft and attaching a belt or chain between said pulleys or gears, respectively. CONSTITUTION:As a main motor 215 is driven, connection is made to a conveyance drive section 310 via a gear train, causing a driving shaft 311 to rotate. The shaft 311 has bearings 312, 313 installed on mounting plates 314, 315 at its ends. The shaft 311 also has a gear 316 fixed at one end of it and a timing pulley 317 fixed near the other end of it. Thus, As the shaft 311 rotates, a first conveying roller section 330 is rotated via a timing belt 322, a second conveying roller section via a timing belt 323 and a third conveying roller section 350 via a timing belt 324, causing a copy to be conveyed while being pressed against a platen glass by pressing springs 337A, 337B installed at the ends of each of the conveying roller sections 330, 340, 350.

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 transfers the document after exposure processing to the document table. The present invention relates to an improvement of a paper conveyance device for discharging documents from above.

[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, conveys the document fed from the document feeding device, and fixes the document at an exposure position on the document table surface, and when exposure of a predetermined number of sheets is completed, the document is transferred to the document table; It is composed of a document conveying means for discharging the document from the 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 the 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 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 applicant 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. 3341/1982).

The document conveying device of the present invention includes a white fixed sheet member that runs along the platen glass surface in the device main body disposed on a copying machine, and documents are conveyed to the gold platen glass surface through through holes provided at appropriate positions in the sheet member. The rollers are in sliding contact with each other so that the overall height of the apparatus is low, and the document can be transported 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.

A drive source (motor) is arranged outside the white fixed sheet member covering the platen glass, and a gear train,
The rotating shaft of each conveying roller is driven and rotated via a transmission means such as a belt, pulley, chain, or sprocket. The conveying rollers are arranged in a plurality of vertical rows near the center line of the platen glass in the sheet feeding direction. The rotating shafts of each of the transport rollers are extended outward for a long time, and the ends of the shafts are connected to gears, pulleys, tin rockets, etc. of the transmission means. In addition, since the conveyance roller is biased by a spring and presses the platen glass surface and the document paper surface, the rotation axis of the conveyance roller has a bearing portion and has a degree of freedom in the direction perpendicular to the platen glass surface, and the rotation axis of the conveyance roller The shaft end is driven on one side by the gear or the boob and receives a torque.

[Problem that the invention seeks to solve]

The rotating shaft of the conveying roller with such a configuration receives rotational torque at one end of the shaft by a driving force transmission means, and has a conveying roller at the other shaft end, which is biased by a spring and presses the platen glass. Because of this, the circumferential surface of the transport roller gets wedged into the platen glass surface due to the uneven load on the rotation axis of the transport roller, resulting in a large load, which can cause impressions and scratches on the platen glass, and cause damage to the transport roller surface. Deformation, wear,
This causes various problems such as scratches, wrinkles, etc. on the original, heat generation due to motor overload, and motor failure.

[Means for solving problems]

In view of the above-mentioned points, the present invention improves a document conveyance device comprising the white fixed sheet member and a rotationally driven document conveyance roller, which can simultaneously realize a reduction in thickness and an improvement in maintainability.
It is an object of the present invention to provide a document conveyance device that realizes smooth rotation of conveyance rollers and simplification of drive transmission means.

In order to achieve the above object, the present invention provides a paper conveying device for documents, etc., which includes a paper feeding means for feeding documents placed on a paper feed tray sheet by sheet toward a document table of a document exposure section; A paper conveyance means for conveying documents, etc., which is disposed on the document table and includes a plurality of paper conveyance rollers for conveying documents fed from the paper feed means; In a paper conveyance device for documents, etc., which has a paper discharge means that cooperates with a paper conveyance means such as A pulley or a gear is provided integrally, a bearing member is provided at both ends of the rotating shaft, a belt or chain is wound between each pulley or gear in the center, and at least one pulley or gear is provided. It is characterized by being integrated with a drive shaft connected to a drive source.

〔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 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 conveying roller drive system, and FIG. 4 is a perspective view of the conveying section. be.

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,
, and a paper discharge section 400.

The document conveying device 100 has a paper feed tray slanted at the top, which is composed of a foldable movable paper feeder 102 and a fixed paper feed tray 103 fixed to the housing body 101. Original sheets can be placed in a stacked manner, and the leading ends of the original sheets are 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 of the document when feeding the document.

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 101, 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, when a document tray is set on the movable paper feeder 102 and 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. At the same time, the feed lever 201 is supported upward and hangs down due to its own weight.
The lower surface of is pushed up and comes into contact with the outer circumferential surface of a double-feed prevention roller 213 and a rib of the housing body 101, which will be described later, and is stopped. 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 swings and its tip portion descends, sinking below the upper surface of the fixed paper feed tray 103.

Next, on the left side of the document conveying device 100 (FIG. 1), a paper feed unit 200 provided 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 sheets one by one from the bottom layer, and a copying machine main unit IO for sending 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;
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. 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 2+5 rotates in the normal direction, power is not transmitted and the main motor 2+5 rotates freely.

On the other hand, on the axis of the second drive shaft 211, second paper feed ports 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, two gears 227 and 228 containing a directional clutch 7 and a shaft-fixed gear 229 are respectively 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 the 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 rotor 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 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 folding position among the document bundles 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, or 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 the second and subsequent documents from being electrically fed 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 multiple feeding section 300.

The conveyance unit 300 is for conveying a document on the platen glass 11, and includes a white fixed sheet member 304 and document conveyance rollers 301, 302, and 303 as main components. The white fixing sheet member 304 is used to press the document during exposure, and is made of plastic, which has solid lubricating properties.
It is made of a plastic material (in this example, PET=polyethylene terephthalate) and completely covers the upper surface of the platen glass. The white solid sheet member 304 has an end on the paper feed section 200 side connected to the twisted coil/(in particular, an end on the paper discharge section side)/fixed section 101a of the housing main body 101. Furthermore, three through holes 304a are provided at appropriate locations along the center line of the white fixed sheet member 304, so that the ends of the document conveying rollers 301, 302, and 303 protrude.

The document conveyance rollers 301, 302, and 303 are for conveying the document on the platen glass 11, and are provided through the through hole 30.
4a, each through hole 30 on the back side of the upper member 304 is configured so that the original document can be rotated and conveyed by frictional force while being pressed through the upper member 304.
A total of 3 pieces are provided corresponding to 4a. The roller 301.
The surface of 302 and 303 is covered with an elastic material with high frictional force (for example, a rubber or plastic sponge body),
The end portion is in contact with the surface of the platen glass 11 through the through hole 304a. In addition, document transport rollers 301, 302.
Reference numeral 303 is capable of forward and reverse rotation so that the final position of the document tray can be finely adjusted during exposure.

3 and 4 show the white fixed sheet member 30 of the conveyance section.
4 taken out and viewed from the platen glass 11 side. FIG.

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 motor shaft of the main motor 215 is connected to the conveyance drive unit 310 via a gear train to drive the drive shaft (station shaft) 31.
1 to rotate. FIG. 5 is a sectional view of the conveyance drive section 310.

The drive shaft 311 has bearings 312 and 313 degrees near both ends of the shaft, and a mounting plate 314 that fixes the bearings 312 and 313.
315, and is rotatably supported by the shaft. Further, a gear 316 is fixed to one shaft end of the drive shaft 311, and a timing pulley 317 is fixed to the vicinity of the other shaft end. The gear 3
16 meshes with a small-diameter gear 320 that is rotatable on an idler shaft 319 fixed to a mounting plate 318. The small diameter gear 320 is integrated with the large diameter gear 321, and the gear 321
is a gear 2 that is integrated with the drive shaft of the main motor 215.
It meshes with 16.

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. Note that the timing belts 322, 323, and 324 may be timing chains. FIG. 6 is a sectional view of these conveyance roller sections. Further, FIG. 7 is an exploded perspective view of the conveyance roller section. In addition, the above-mentioned conveyance roller part 330.340.350
Since they are all made up of common members, the first conveyance roller section 330 will be explained below as a representative.

A timing pulley 331 is fixed to the center of a rotating shaft 301a that is integral with the document transport roller 301. Further, bearings 332A and 332B made of a steel-based sintered alloy are fitted to both ends of the rotating shaft 301a.

The bearings 332A, 332B are inserted into vertically elongated holes of the front and rear conveyor roller mounting plates 333 and 334, respectively, and are prevented from rotating at the notches. After the rotating shaft 301a of the document conveying roller 301 is inserted into the mounting plates 333 and 334 together with the bearings 332A and 332B, its axial direction is regulated by a roller stopper member 335.

The mounting plates 333 and 334 have shafts 336A and 336A, respectively.
336B is installed, and pressure springs 337A, 33
7B fits loosely. On the other hand, one end of the mounting plates 333A, 334B is bent at a right angle to form protrusions 333a, 334.
b, and one ends of the ribs 337A, 337B are locked therein. The other ends of the pressing springs 337A and 337B are pressed against the outer circumferential surfaces of the bearings 332A and 332B, so that both ends of the rotating shaft 301a are biased, and the outer circumferential surface of the document transport roller 301 is pressed against the surface of the platen glass 11. do.

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, and the timing belt 3
23 rotates the timing pulley 341 and the rotation is transmitted. In addition, timing pre 317.33
1.341.351 may be a timing gear.

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 in the same manner as described above to move the platen glass 11.
Apply pressure to the side.

The document fed from the paper feed section 200 toward the platen glass 11 is transferred to the conveyance roller 30 of the conveyance section 300 shown in FIG.
1.302.303, the document slides on the platen glass 11, and the rear end of the document plate hits the document rear end stopper (abutment plate).
Pass 12.

After the trailing edge of the document being fed passes the document detection sensor 241 and a trailing edge detection signal is generated, a certain number of pulses are counted.

When this number of pulses is counted up, the main motor 2
15 is changed from normal rotation to reverse rotation again, and the second paper feed roller 2
The document tray 26 is set in a predetermined position on the platen glass 11 by slightly reversing the document tray and abutting the rear end of the document tray against the abutting plate 12.

Thereafter, after a predetermined pulse count, the white fixed sheet member 304 presses the document against the platen glass 11, and exposure scanning and image forming processing of the document are subsequently started within the copying machine main body 10.

After completing the exposure scan, the document passes through the transport section 300,
Paper discharge roller 401 and pinch roller 402 of paper discharge section 400
, 403 and is discharged, and placed on an external paper discharge tray 106.

Paper discharge sensor 40 provided in the conveyance path of the paper discharge section 400
4, when the leading edge or trailing edge of the document is detected,
The feeding operation for the second and subsequent documents is repeated in the same manner as above.

〔Effect of the invention〕

As described above, the paper conveyance device for originals, etc. of the present invention is a roller conveyance type document conveyance device that has realized a thinner device and improved maintainability. A pulley for transmitting rotational force is integrally provided in the section, and a bearing member and a pressure spring are provided at both ends of the rotating shaft, and a belt or chain is wound between each of the boars in the center, and at least one Since the pulley is integrated with the drive shaft connected to the drive source, each document conveyance roller is rotationally driven by the bobbin in the center, and is driven by the pressure springs at both ends. Pressed evenly onto the platen glass surface. This eliminates the biasing load on the document withdrawal roller during rotation, and eliminates problems such as motor overload and motor lock caused by abnormal loads. Furthermore, problems such as damage to the document transport roller and platen glass surface have been significantly improved. Furthermore, the structure of the conveying section is simplified, resulting in excellent effects such as lower cost and improved reliability.

In the above description, the document conveyance device has been described, but the present invention can also be applied to a general paper conveyance device.

[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 diagram of the entire drive system of this document conveying device, FIG. 3 is a plan view of the conveying roller drive system, and FIG. 4 is a perspective view of the conveying section. , 5th
FIG. 6 is a cross-sectional view of the conveyance drive section, FIG. 6 is a cross-sectional view of the conveyance roller section, and FIG. 7 is an exploded perspective view of the conveyance roller section. 100... Document conveyance device 101... Housing main body 200... Paper feed section 300... Conveyance section 301, 302. 303... Document conveyance roller 30
4... White fixed sheet member 310... Conveyance drive unit 311... Drive shaft 3
12, 313.332A, 332B...Bearing 317
．． 331.341.351...Timing pulley (gear) 322, 323.324...Timing belt (
Chain) 330...First conveyance roller part 340...Second conveyance roller part 350...Third conveyance roller part 333, 334...Conveyance roller mounting plate 337A, 3
37B... Pressing spring 400... Paper discharge section D...
Manuscript applicant share

Claims (1)

[Claims] a paper feeder that feeds the original placed on a paper feed tray sheet by sheet toward a document table of a document image exposure section; and a document arranged on the document table and fed from the sheet feeder. A paper transport means for originals, etc., consisting of a plurality of paper transport rollers for transporting originals, etc., and a paper transport means for transporting originals, etc., which have undergone exposure processing, are conveyed in cooperation with the above-mentioned paper transport means for originals, etc., and discharged onto a paper ejection tray. In a paper conveyance device for documents, etc., having a sheet ejecting means, a pulley or a gear for transmitting rotational force is provided integrally at the center of the rotation shaft of the paper conveyance roller for each document, etc., and a pulley or a gear is provided at both ends of each rotation shaft. A bearing member is provided, a belt or chain is wound between each of the pulleys or gears in the center, and at least one pulley or gear is integrated with a drive shaft that connects to a drive source. Paper transport device for manuscripts, etc.