JPH02265874A - Circulating type document conveyor - Google Patents

Abstract

PURPOSE:To stably perform the action of sorting a document without being damaged by discriminating a bundle of the document on a document mounting bed to circulate by a sorting arm member dropped by its own weight while lifted by drive force when the sorting arm member is horizontally and helically rotated. CONSTITUTION:A document D, placed in a condition it is loaded, is set being adapted to a rear end restricting plate 202, when a copy button is pressed, a rotary shaft member 274 is rotated with a pulley 278 by a motor, and a document sorter 270 first horizontally rotates its sorting arm member 275A retracted and detached in a horizontal direction from the lowermost layer of the document D. Next, the sorting arm member rises turning along a helical cam surface 273B in an axial restricting member 273, when the sorting arm member reaches a top dead center plane of the cam surface, the sorting arm member is slided horizontally rotating, adapted to a stopper, dislocated from the cam surface, dropped down by the own weight and adapted to the uppermost layer of a bundle of the document D. The sorting arm member successively lowers following a paper feed, accepts a return document and loads it to its upper part and, after circulation of one round, it is dropped downward and detected by a sensor. Thus stable sorting action can be performed without any damage of the document.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention separates and feeds a stack of originals one by one from a stack of originals placed on a document tray, and places them at exposure positions on the glass surface of the document tray. Regarding a circulating conveyance device that feeds a document, discharges the document from the exposure position after exposure processing, and returns it to the document mounting table, specifically, it identifies the document fed to the exposure position and the document returned after exposure processing. The document classification to be performed is related to the device.

[Conventional technology]

Conventionally, a stack of originals to be fed is placed on the original table.
A frictional separation means provided at the feeding end of the document bundle sequentially separates the lowest sheets of the document bundle one by one, and the documents are further fed to a predetermined position on the document table glass (platen glass), and after exposure processing is completed. The original is ejected and returned to the document tray.
2. Description of the Related Art Circulating document conveyance devices (RDH) configured to be stacked on top of a stack of unfed documents are mainly used in electrophotographic copying machines and the like.

In such a circulating document feeder, it is necessary to detect the circulation of documents, and usually a partition arm (separator) is placed in advance on the top layer of the stack of documents stacked on the document tray. The bundle of originals is sequentially stacked on the upper part of the partition arm, and when the last original pressed against the partition arm is fed to the exposure position, the partition arm is retracted from the original placement position, When the last page returns to the document table and is placed on the top layer of the document stack, the partition arm comes into pressure contact with the top layer of the document stack.

There are two types of partition arms: one type in which the partition arm is placed at the rear edge in the feeding direction of the original document stored on the document table, and the other type in which the partition arm is placed on the side surface of the document stack. The side placement format can only be used to align originals of various sizes on one side using one side of the document placement table as a reference surface, but it is not suitable for document transport devices that align documents using the center of the document width as a reference. .

Japanese Patent Publication No. 56-40338 discloses a circulating document conveying device in which a partition arm is arranged at the rear edge of the document in the feeding direction.
US Pat. No. 4,164,347 and the like are known.

[Problems that Komei tries to solve]

When placing the partition arm above the stack of originals placed on the document tray, if the partition arm is driven by rotation of a motor, the partition arm may not be placed above the stack of originals due to the difference in thickness of the stack of originals. It was becoming difficult to control the position to ensure the correct position. Further, even if the aforementioned motor was a pulse motor that could accurately position the partition arm, there was a similar difficulty. Therefore, if the partition arm is deenergized before it reaches the document stack, the partition arm becomes rotatable, causing a phenomenon in which it hits the document and bounces back (rebound).
It has the disadvantage of damaging the originals, and also has the problem of not being able to bundle the originals in an orderly manner.

Next, in the document circulation device described in Japanese Patent Application Laid-Open No. 60-83024, by rotating the motor for a certain period of time, the partition arm is rotated by a drive lever that is integrated with the motor shaft, and the document is placed on the document table. If there is a document, the partition arm comes into contact with the document and stops, and then an overload is applied to the motor, which locks it once and stops its rotation (auto shutoff). Thereafter, as the documents are sequentially fed and the document bundle below the partition arm decreases, the partition arm descends due to its own weight while contacting the document bundle. When there is no document bundle left, the partition arm descends into the notch space below the document table and stops.

However, when the partition arm comes into contact with the document bundle and stops, the partition arm strongly presses against the document surface and is stopped by a motor lock, so there is a risk that the document may be damaged due to overpressure of the partition arm. If the motor 7014 time from when the partition arm contacts the document surface to when the motor stops is too short,
The partition arm may reverse and return.

In addition, if the above motor ON time is too long, the partition arm is driven by the motor and presses the document surface during document feeding, resulting in large paper feeding resistance, resulting in poor paper feeding, scratches on the document surface, and smeared document images. occurs.

Note that the optimum time for turning on the motor varies depending on the paper quality of the original, and further changes depending on the number of originals (thickness of the stack of originals), so it is impossible to set it to a constant value.

[Means for solving problems]

The present invention eliminates the drawbacks of the conventional example, and ensures that the partition arm is placed above the document stack on the document placement table, and that the partition arm is reliably retracted and re-raised after the document circulation. The object of the present invention is to provide a highly reliable circulating document conveyance device.

That is, it is an object of the present invention to provide a partitioning device that is not affected by the thickness of the original, operates reliably, and does not damage the original.

The above purpose is a circulation type document transport device that separates and feeds a stack of originals placed in a stack on a document placement table one by one, transmits image information, ejects the documents, returns them to the document placement table, and stacks them. In this document, the classification for identifying the circulation of the document bundle on the document table is achieved by a circulating document conveying device characterized in that the arm member is an arm member that moves in a helical manner.

Further, the circulation type document conveying device of the present invention has a rotary shaft member that is integral with the arm member and is rotatable, and a spirally curved surface that rotatably supports the rotary shaft member and is secured to the arm member. a shaft regulating member having a vertical surface; and a driving means for driving the rotary shaft member for a certain period of time; the rotary shaft member having the arm member is rotated by the driving means and detached from the document surface, and then the rotary shaft member having the arm member is rotated, and the rotary shaft member having the arm member is detached from the document surface, and then the rotary shaft member has a vertical surface. The apparatus is characterized in that, after reaching the top dead center of the ascent, the arm member falls under its own weight along the vertical plane, thereby bringing the arm member into pressure contact with the upper surface of the document bundle.

〔Example〕

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

In FIG. 1, 100 is a main body of the copying machine, and 200 is a circulation type document conveying device. The document conveying device 200 includes a document placement table 201 having a front curved shape in the paper feeding direction, and a rear end regulating plate 202 on the document placement table 201 for abutting the rear end of the document tray when setting the document tray. A width regulating plate 203 is provided for regulating the width direction of the document. The width regulating plate 203 is connected to a pair of racks 205 and 205 that can alternately slide horizontally across a binion gear 204 on the lower surface of the document table 201, and can be moved symmetrically around the center. The horizontal size of the document can be read by detecting its moving position with a sensor (not shown). Further, the trailing edge regulating plate 202 has a function of pushing the leading edge of the original set on the original placing table 201 to the detection position (orientation value) of the stack sensor 206. 207 is document mounting table 2
This is a document setting detection sensor that detects whether or not a document tray is set on 01. The detection sensor 207
is installed at the front upper part of the rear end regulating plate 202, and can move integrally with the regulating plate 202.

When the document tray is stopped at the original position on the document tray 201, the rear end of the document tray is pressed and the document tray 201 is stopped.
01 and when the leading edge of the document tray reaches the paper feeding start position, it is constantly checked whether the document tray is set on the document tray 201. The original is placed on the original placing table 20 so that it can be detected.
It is possible to prevent unnecessary copying such as starting a copy operation even though the setting is not set to 1.

Reference numeral 208 denotes a document stopper that is disposed close to the paper feed port of the document mounting table 201 in the paper feed direction.

The document stopper 208 is fixed to the frame of the paper feeding section, and a predetermined parallel gap is formed between its lower end and the upper surface of the document table 201. This document stopper 208 abuts the leading edge of the document to be fed after going around the top surface of the platen glass 102 and returning to the document placement table 201, so that it can be used for feeding the next document. It has a function to align the tip.

Reference numeral 210 denotes a pushing belt for pushing out the document sheet at the fixed position to the paper feeding position as described above. The extrusion belt 210
is a so-called half-moon roller 209 with a part of its outer periphery cut out.
It is formed by a perforated belt stretched between A and 209B. One half-moon roller 209A receives driving force from the main motor 240 via a one-turn spring clutch.

Reference numerals 21 and 1 denote a paper feed belt that sends out the document sheets at the paper feed position from the lowest layer, and 212 a stop roller that comes into pressure contact with the paper feed belt 211 to prevent double feeding of the document sheets. These form a separating means. ing. The paper feed belt 211 is stretched between a drive roller 215 and a driven roller 216, which are connected to a main motor 240 via an electromagnetic clutch (not shown) installed on the shaft and a one-way control means, and the upper belt The surface slightly protrudes from the upper surface of the document mounting table 201.

When the half-moon roller 209A starts rotating by the main motor 240, the driving force from the main motor 240 is separated by a spring clutch (not shown) that rotates along with the half-moon roller 209A and stops one rotation.

Therefore, the half-moon roller 209A always reliably makes one rotation and stops.

Further, the extrusion belt 210 is provided in each of the through-holes 201 which are arranged side by side at a plurality of locations on the document mounting table 201. When the notches of the half-moon rollers 209A and 209B are on top as shown in FIG.
．． a, and protrudes when the circumferential areas of the half-moon rollers 209A and 209B are upward. In other words, the original platen 2
The document in the fixed position on 01 is half-moon roller 209A,
With one rotation of 209B, it is extruded by the friction of the extrusion belt 210 that protrudes from the through hole 201a. In this case, the paper feed belt 211 is connected to the main motor 2 by the action of an electromagnetic clutch.
Since the power from 40 is cut off and the document stands still, the leading edge of the extruded document is connected to the paper feed belt 211 and the stop roller 2.
12 nip parts (one wedge-shaped part will be cut into the nip part).

Reference numeral 213 denotes a suction box provided to surround the extrusion belt 21O from the lower surface side of the document mounting table 201, and the suction box 213 uses the suction action of its suction fan 214 to draw one of the lowest sheets of documents into the through hole 201a. 111 is configured so that the extrusion belt 210 can be adsorbed in the gap between the extrusion belt 210 and the belt hole, and the extrusion force of the extrusion belt 21O can be effectively exerted.

A is a forward path that guides the document fed from the paper feeding mechanism related to the document feed described above onto the platen glass 102 of the copying machine 100 which becomes the exposure processing section 101, and B is a path on the platen glass 102. This is a reversing path for reversing the document once fed before or after exposure. The reversing path B can correct the reversal so that the even-numbered page side of a double-sided document faces the platen glass 102 surface, and can re-invert and correct the order of the pages when returning the thus corrected and exposed document to the document mounting table 201. It is designed to draw an upward loop from the same surface as the platen glass 102 and merge with the upper side of the antegrade path A.

218 is a conveyance roller provided in the middle of the forward path A;
19 and 220 are conveyance rollers provided in the middle of the reversing path B. These transport rollers 218.21.9, 22
0 is connected to the main motor 240 via a one-way control mechanism so that it can always rotate in the same feeding direction.

Reference numeral 221 denotes a conveyor belt for conveying the original in the forward and reverse directions on the upper surface of the platen glass 102.

This conveyor belt 221 is connected to a first roller 2 on the sheet feeding side connected to a main motor 240 via a forward/reverse switching means 217.
22 and a second roller 223 on the paper ejection side. A tension roller 224 is in pressure contact with the upper belt surface near the first roller 222, and the lower belt surface is in sliding contact with the platen glass 102 by a plurality of presser rollers 225, 225, 225.

The first roller 222 and the second roller 223 are connected to each other by a timing belt (not shown). When the conveyor belt 221 rotates in the forward direction (clockwise in FIG. 1), it runs by the driving force from the first roller 222, and the lower belt surface is on the slack side. In this case, the second roller 223
is designed to slip between the one-way clutch and the one-way clutch. Furthermore, when rotating the conveyor belt 221 in the opposite direction (counterclockwise), the one-way clutch is locked;
The second roller 223 becomes the driving side of the conveyor belt 221.

That is, the conveyor belt 221 sometimes runs with the first roller 222 on the driving side, and sometimes runs with the second roller 223 on the driving side. This is particularly effective when synchronized exposure is performed while the document is being fed on the platen glass 102.

Reference numeral 103 denotes a document stopper provided at the end of the platen glass 102 on the paper discharge side, and is capable of moving in and out of the platen glass 102. This document stopper 103
In this case, the original is transferred to the conveyor belt 22 as in the original circulation copying mode.
1, while transporting the photoreceptor over the platen glass 102 at a synchronous exposure speed, the exposure optical system 110, which is provided directly below the platen glass 102 and has a selectable mode of fixed position and movement, is used to expose the photoreceptor drum in a fixed state. When creating an image, the original is lowered through the platen glass 102, stopped at the exposure position on the platen glass 102 as in the ADF or SDF mode, and exposed while moving the front optical system 110, and then placed on the drum. When creating an image thereon, it operates so as to protrude above the platen glass 102.

226 is a paper discharge guide plate continuous to the exit side of the platen glass 102, and 227 is a paper discharge belt. The paper ejection belt 227 is pivotally supported immediately behind the document mounting table 201 in the feeding direction.
A drive roller 228 is connected to the main motor 240 via a one-way control mechanism, and upper and lower end rollers 229 and 230 are pivotally supported so as to be movable in the horizontal direction along the upper and lower surfaces of the document table 201. and the paper discharge guide plate 22
Auxiliary rollers 231, 232.
A group of rollers 233 moves the rear side of the original table 201 to
The drive roller 228 is stretched so as to be rolled into a mold shape.
By rotating in a certain direction, the document sent out from the conveyor bell l-221 can be conveyed in the paper ejection direction.

Upper and lower end rollers 22 of the front paper discharge belt 227
9.230 slides via a roller member into two parallel horizontal grooves 242.242 and 243.243 provided on both side frames 241.241 of the document conveying device 200 as shown in FIGS. 2 and 3. Upper stage moving body 244 that can be held
and the lower moving body 245, and each moving body 244, 245 is connected to the skeleton 2 on both sides.
Attachments 248.41.241 are attached to the upper and lower sides of the chain 247, which is stretched between sprockets 246A, 246B, 246G, and 246D, which are supported by two sprockets at the front and rear of the sprocket 241.
They are connected via H.249. The lower front tin rocket 246A is connected to a chain drive source 250 that can be reversed forward and backward.
The gears are connected to each other via intermediate gear trains 251A and 251B. Therefore, if the chains 247, 247 run with the forward and reverse rotation of the chain drive source 250, the upper end roller 229
The lower end rollers 230 move oppositely to each other, and the belt tension of the paper discharge belt 227 is always maintained constant.

The movement mechanism of the paper ejection belt 227 is the document mounting table 201.
This is configured as a movement control mechanism for the trailing edge regulating plate 202 against which the trailing edge is abutted when a document tray is set thereon, and the trailing edge regulating plate 202 touches the upper moving body 244.
It is attached to cover the front of the upper end roller 229. As shown in FIG. 3, a convex portion 202a is provided on the lower edge of the original table 201, which can fit into a concave portion 201b of a shallow concavo-convex portion parallel to the paper feeding direction provided on the rear upper surface of the document table 201. It is configured so that the original to be pressed does not slip under.

In FIG. 3, reference numeral 252 denotes a home position sensor of the rear end regulating plate 202, and the sensor 252 detects the rear end at a position blocked by a blocking member 253 provided on an attachment l-248 connected to the upper side of the chain 247. This is determined as the home position of the regulation plate 202. This home position is the maximum size (for example, A3 size)
Be sure to place the rear edge of the original against it.

The chain drive source 250 is controlled by a control means 25 as shown in FIG.
4 controls the forward/reverse rotation and the amount of rotation.

This control means 254 detects that the original is set on the original placing table 201 by the original setting detection sensor 207.
When confirmed, the chain drive source 250 is rotated in the normal direction by the ON signal of the copy button, and the
The rear end regulating plate 202 is advanced starting from 02PI. The document set detection sensor 207 is connected to the rear edge regulating plate 20
2, and detects the misalignment of the document during movement. Therefore, if the document is removed from the top of the document t2 device 2 during movement or immediately after the movement is completed for some reason, it will be immediately detected and a detection signal will be transmitted to the control means 254 and the chain drive source 250 will be activated. make it stop. When the leading edge of the document is detected by the stack sensor 206 and the detection signal is received, the chain drive source 250
After stopping, reverse the rotation. As a result, the rear end regulating plate 2
02 moves backward using its stop position as its forward movement point. In this case, the document may be moved back to the home position, but in this embodiment, the document is moved back by the size of the document from the front of the document stopper 208.

This is effective for minimizing the amount of advance of the trailing edge regulating plate 202 when refeeding the document after the document has been fed once.

In order to determine the document size, the forward movement point (stack sensor detection point) 2 is moved from the initial position 202P of the trailing edge regulating plate 202 detected by the home position sensor 252.
It is provided with means 255 for detecting the amount of movement from 02P, 202P2, to -202Pn, and means 256 for determining the document size with respect to the amount of movement. That is, the determining means 256 determines a plurality of document size information (
For example, A 4 , A 3 , B 4 , B 5 , etc.)) and a selection circuit that selects necessary document size information from the memory circuit based on the output from the movement amount detection means 255. . Therefore, the size of the document can be determined by the amount of movement of the trailing end regulating plate 202 from the initial position to the forward movement point, and the determination result is output to the control means 254, and the amount of rotation of the chain drive source 250 when reversed is controlled. As described above, the trailing edge regulating plate 202 can be correctly retreated to the designated position corresponding to the document size. In addition, in the storage circuit of the determining means 256, non-conforming size information (for example, 85 or less) is stored together with a plurality of document size information, and when the document is determined to be non-conforming, an operation prohibition signal is sent to the control section of the main motor. It is designed to output . Needless to say, the result of the determination by the determining means 256 is also output to the control section for selecting the transfer paper on the copying machine main body side, so that it is possible to feed the transfer paper that matches the original size.

Reference numerals 257 and 258 refer to a presser roller 2 that contacts the paper ejection belt 227 from the outside of the paper ejection guide plate 226 through a through hole at a position corresponding to the auxiliary rollers 231 and 232.
Reference numeral 59 indicates a ceiling guide plate connected to the upper rear end of both side frames 241 of the document conveying device 200, and reference numeral 260 indicates a ceiling guide plate connected to the upper part of the rear end of the frame 241 on both sides of the document conveying device 200;
A paper ejection log guide plate 261 facing the upper surface of the upper belt portion with a slight gap is a presser roller that contacts the paper ejection belt 227 through a through hole from the upper surface of the paper ejection log guide plate 260. Reference numeral 207 denotes a document setting detection sensor that detects whether a document tray is set on the document table 201. The document set detection sensor 207 is fixedly installed on the paper discharge log guide plate 260.

The document set detection sensor 207 is connected to the paper discharge log guide plate 2.
60 with the front portion protruding forward. A through hole is bored in the front lower surface of the frame body to which the detection sensor 207 is attached, and light projected from the frame body of the detection sensor 207 and light reflected to the detection sensor pass through the frame through hole. It is supposed to be done. The above detection sensor 20
Reference numeral 7 denotes a detection sensor in which a light emitting part and a light receiving part, each of which is composed of a light emitting LED and a phototransistor, are provided within the same frame. The projection light projected from the light projection part (light emitting LED) passes through the frame through-hole and reaches the reflection plate 202b integrally projected forward from the lower edge of the rear end regulating plate 202. The reflected light reflected by the reflection plate 202b is
Passes through the frame through hole again and passes through the light receiving section (phototransistor)
reach.

Reference numeral 262 denotes a switching claw provided in the middle of the paper ejection guide plate 226 for switching between a circulating paper ejection path C in which processed originals are directed toward the document mounting table 201 and an external paper ejection path in which the processed originals are directed to the paper ejection tray 263 outside the machine. Then, when the trailing edge regulating plate 202 returns to the home position, it moves to open the external paper discharge path, and when the trailing edge regulating plate 202 is not at the home position, it opens the circulating paper discharge path C. It is movable. As shown in FIG. 5, the switching pawl 262 is fixed to a support shaft 264 rotatably supported by the skeleton 241 at both ends. A contact plate 265 is provided inside the end of the support shaft 264.
is fixed thereto, and when a protrusion 244a protruding from one end surface of the upper moving body 244 presses the abutment plate 265, the switching pawl 262 is activated. Upper moving body 244
is stopped at the home position, the switching claw 26
2 continues its operation and opens the external paper discharge path.

When the upper moving body 244 moves and leaves the home position, the tip of the protrusion 244a separates from the surface of the contact plate 265, and the spring 266 provided at the top of the corresponding sliding plate 265 acts to pull the contact plate 265. However, the switching claw 262 opens the circulating sheet discharge path C.

The upper moving body 244 is equipped with the upper end roller 229, the trailing edge regulating plate 202, and the document set detection sensor 207 as described above. It is suspended nearby and forms an integral part (as shown in Figs. 1 to 5). FIG. 6(A) is a plan view of the device 270, FIG. 6(B), and FIG. 6(C).
is a sectional view thereof.

A shaft regulating member 27 is provided at the lower part of the upper board 271 having a mouth shape.
3 is fixed. A rotary shaft member 274 is rotatable and movable up and down in the inner cylindrical portion of the shaft regulating member 273. The upper part of the rotating shaft member 274 is divided into an arm member 2.
75 is fixed. In this section, the arm member 275 integrally forms a small diameter arm portion 275A.

Further, a spirally curved cam surface 273B is formed on the peripheral wall of the shaft regulating member 273. The cam shape of the cam surface 273B is shown in FIG. That is, 09 to 90 degrees is the bottom dead center plane 273A, and 90'' to 270 degrees is the helical curved surface 27.
3B, and at 270° to 3600 the top dead center plane 27
3C, and forms a vertical plane 273D at the 360° position.

The upper end of the rotating shaft member 274 is rotatably fitted and supported by a bearing 276 fixed to the upper substrate 271, and the lower end is rotatably fitted and supported by a bearing 277 fixed to the lower substrate 272. , can be rotated up and down. Further, the circumferential surface of the intermediate portion of the rotating shaft member 274 is cut into parallel planes, and is fitted into the oval hole of the large diameter pulley 278, so that it can rotate as a body and can slide in the axial direction. be. Note that the upper substrate 271 and the lower substrate 272 are arranged and fixed in parallel by a stay 279.

A cam surface 278A is formed on the lower surface of the large diameter pulley 278, and a micro switch 278A is formed on the lower surface of the large diameter pulley 278.
80.

At the bottom of the other end of the lower board 272, a motor 281. Ohm 282. A drive unit housing 284 containing a worm wheel 283 is installed, and a small diameter pulley 286 fixed to the upper end of a drive shaft 285 that is integrated with the worm wheel 283 applies rotational force to the large diameter pulley 278 via a belt 287. introduce.

Further, a holding member 288 is fixedly provided at the lower part of the lower substrate 272, and a swinging lever 29 is supported by a rotating shaft 289 passing through the holding member 288.
0 is swingably supported. When the rotating shaft member 274 descends to the vicinity of the bottom dead center, the swinging lever 290 is pressed against one end and swings clockwise around the rotating shaft 289, and the slow closing plate portion at the other end , photo interrupter-29
The optical path No. 1 is closed late, and the reaching of the bottom dead center position of the rotating shaft member 274 is detected to generate a signal.

Next, the operation of the document sorting apparatus L270 according to the present invention will be described. FIG. 7(A) is a side view of the device 270 showing the document classification at the start of operation, and FIG. 7(B) is a sectional view thereof.

■The trailing edge regulating plate 202 is in the home position with the originals stacked and the copy side facing up, aligned in page order from the top.
Place the rear end against the After further regulating the width direction with the width regulation plates 203, 203, the number of copies to be created is input, and the copy button is turned on.

■The motor 281 is turned on, and the worm 282, which is integrated with the motor shaft, is driven, and the worm wheel 283° and the small diameter pulley 286. Large diameter pulley 27 via belt 287
8 is rotated. As a result, the rotation of the rotating shaft member 274 is restricted and the rotation is freely movable in the axial direction with respect to the large-diameter gooley 278.
is rotated. If this rotation is within the range of Oo~906,
The arm member 275 horizontally rotates about the bottom dead center plane 273A and retracts and leaves the lowermost layer of the document stack stacked on the document table 201 in the horizontal direction.

■As the motor continues to drive, the rotating shaft member 274 is further rotated, and in the range from 90'' to 270°, the document classification is the member 2.
The side surface of the arm portion 275A of 75 is connected to the shaft regulating member 27.
It rotates upward while slidingly contacting the spiral cam surface 273B of No. 3.

■The rotating shaft member 274 is further rotationally driven, and 270' to 3
In the range of 6o0, the arm portion 275A slides on the top dead center plane 273C of the cam surface of the shaft regulating member 273, and the arm portion 275A rotates at the top dead center. FIG. 6 shows this state.

(2) When the rotating shaft member 274 is rotated around 360°, the arm portion 275A comes into contact with the stopper surface of the stopper member 292 fixed to the upper substrate 271, and falls from the top dead center plane 273C of the cam surface. Due to the weight of the rotating shaft member 274, it slides on both parallel cut surfaces of the rotating shaft member 274 and the oval hole of the large diameter pulley 278, and freely falls vertically downward along the vertical surface 273D of the shaft regulating member 273. , press the top layer of the document stack.

■When the rotating shaft member 274 and the large-diameter pulley 278 whose rotation direction is regulated are rotated by one rotation + σ angle, the large-diameter pulley 278
The cam surface 278A on the lower surface engages with the microswitch 280 to generate a motor stop signal and stop the motor 281.

- By stopping the motor 281, the arm portion 275A does not rotate, and the weight of the rotating shaft member 274 presses the document surface. After that, as the document stack below the arm portion 275A is fed, the document bundle decreases to the arm portion. 275A gradually descends, and at the same time, the circulated originals are gradually deposited above the arm portion 275A.

■When the number of documents below the arm section 275A reaches zero, the arm section 275Al'! It falls below the document placement plate 201,
During document classification, the member 275 comes into contact with the bottom dead center plane 275A of the shaft regulating member 273 and stops.

At this bottom dead center position, the lower end of the rotating shaft member 274 presses one end of the swinging lever 290 to swing it, late closing the optical path of the photo interrupter 291, and generating a detection signal indicating that the bottom dead center position has been reached. and displays the completion of one circulation of the document stack.

On the other hand, at the start of document feeding, the chain drive source 250 is started, intermediate gears 251A, 252B, sprocket 2
46A, the chain 269 is rotated normally, and attachments 248 and 249 are attached to the upper and lower sides of the chain 247.
The upper end row 2229, which is pivoted to the upper moving body 244 coupled to the upper moving body 244 via the
5 is moved rearward in the paper feeding direction. Therefore, the trailing edge regulating plate 202 attached to the upper moving body 244 so as to cover the front of the upper end roller 229 moves forward while pushing the rear end of the document tray, and moves the leading edge of the document tray below the document stopper 208. Although it passes through
When the leading edge of the document is detected by the stack sensor 206, the chain drive source 250 is activated by the action of the control means 254.
stops.

Next, the main motor 240 is driven, and the half-moon roller 2
09A, 209B and the extrusion belt 210, the document feeds the paper feed belt 211 and the stop roller 212.
It is pushed out towards the nip. At this time, the paper feed bell l-
211 remains unrotated due to the action of the electromagnetic clutch, the pushed out document enters the nip between the paper feed belt 211 and the stop roller 212 in a wedge shape before the document in the lower layer and is stopped.

Next, the electromagnetic clutch is turned ON, and the paper feed bell)・21
1 rotates in the paper feeding direction. At this time, the stop roller 212 in contact with the paper feed belt 211 is maintained in a non-rotating state, so the bottommost document is sent out by the paper feed belt 2111, and the second and subsequent documents are transferred to the stop roller 211. 2
12 to prevent double feeding. This paper feed bell I-2
When rotating 11, the extrusion belt 2I is rotated.

The scanners also start in synchronization, and during one revolution, only the bottom layer of the original is absorbed and separated from the stack of originals stacked above it.
It acts to push out the paper in the feeding direction.

As described above, the trailing edge regulating plate 202 stops when the leading edge of the document is detected by the stack sensor 206, and then retreats from that position to a specified position determined by the size of the document.

In this way, a sheet of original sent out by the paper feed belt 211 enters the forward path A, is nipped by the conveyance roller 218 provided on the way, and is directed toward the platen glass 02 and the conveyance bell +-221 at a synchronous exposure speed. transported by After the leading edge of the document crosses the synchronization sensor 234 provided in the middle of the forward path A (directly below the conveyance roller 218) and after the timing for each size! Turn off the magnetic latch.

The original transported by the transport roller 218 is transferred to the transport belt 2.
At step 21, the photoreceptor is exposed to light using a fixed optical system 110 while being conveyed on the platen glass +02 at a synchronous exposure speed to form an image on the photoreceptor drum. The original document after exposure processing moves upward along the paper discharge guide plate 226 and is discharged toward the document table 201 by the paper discharge belt 227. In this case, the presser rollers 257 and 2 are brought into contact with the roller support portion of the paper ejection belt 227 through a through hole from the outer surface of the paper ejection guide plate 260 and the paper ejection guide plate 226 constituting the paper ejection path.
58 and 261 support the yK paper, paper ejection port 2
Even if 67 moves its position according to the document size etc.
Regardless of the size of the document fed by the conveyor belt from above the platen glass 102, the document is never nipped between the conveyor belt and the paper ejection port 267, and the document cannot be ejected. There isn't.

Further, the originals discharged onto the original placing table 201 are re-stacked with their front and rear edges aligned by the original stopper 208 and the trailing edge regulating plate 202, and with their widths aligned by the width regulating plates 203, 203. Ru.

The above-mentioned feeding operation is changed to the feeding timing and synchronous conveyance speed determined for each copy size and copy magnification, and is repeated until there is no remaining document on the document mounting table 201. Then, when the stack sensor 206 detects that there is no remaining document left, and the discharge sensor 268 detects that the last document has been ejected, the trailing edge regulating plate 202 feeds out the stacked document until the set number of copies is completed. Repeat the above action. When the set number of copies is completed and the number of copies is detected by the paper discharge sensor 268, the trailing edge regulating plate 202 returns to its home position and prepares for the next operation.

The above operation is performed when a one-sided original is copied on one side in the RDH mode. Therefore, the platen glass 10 of the copying machine 100
The original stopper 103 provided at the end of the paper ejection side of No. 2 is recessed below the platen glass 102, and
The exposure optical system 110 is in fixed position mode.

Furthermore, in the case of single-sided copying of a double-sided original in the RDH mode, as described above, when the original sent from the original placing table 201 is fed to the platen glass 102 via the forward path A, the final sheet on the platen glass 102 is Since the page is on top, first, after stopping the original fed onto the -degree platen glass 102 surface, the transport belt 221 is reversed, the original is sent to the reversing path B, and the original is reversed in a somersault shape. , and is exposed by the fixed optical system 110 on the platen glass 102 with the last page facing down. ■ After the exposure is completed, the conveyor belt 221 is reversed again, the original is passed through the reversing path B again, the pages are corrected, the other page side is facing down, and then exposed on the platen glass 102, and the original is placed on the original mounting table 2. Return to. By repeating the operations from ■ to ■, a single-sided copy of a double-sided original is completed.

Therefore, in order to make double-sided copies of a double-sided original, when the above-mentioned step (2) is activated, return it to the original platen 2 without exposing it to light, copy only the even-numbered pages in the - cycle, and copy the odd-numbered pages in the second cycle. . Naturally, when copying odd-numbered pages, no reversing operation is required. Of course, the feeding operation of the transfer paper on the copying machine 100 side is also performed in accordance with the above-mentioned document conveying operation.

In any of the above modes, when the process is completed, the synchronization sensor 234 detects the passage of the final document, and after each size timing, the CPU sends a signal to end the copying operation.

Note that the device for the above document classification is a circulating document conveyance device (R
This invention is effective when applied to a document setting section (DH), but it is also applicable to a document conveying device in which the document setting section and the ejected document placement surface are the same.

〔Effect of the invention〕

As explained above, the circulation type document conveyance device of the present invention has the following features:
The originals set or restacked on the document tray are returned to the document tray in a closed loop from the document tray through the paper feed section and the processing section. The document sorting member operates smoothly by horizontal rotation and spiral rotation, without damaging the document.
The operation of the manuscript classification is stable. In addition, it has become possible to stably classify documents and efficiently process documents regardless of the number of documents.

[Brief explanation of drawings]

1 to 8 show embodiments of the present invention, FIG. 1 is a front sectional view of the document conveying device, FIG. 2 is a perspective view of the document ejecting section, and FIG. 3 is a perspective view of the document discharging section. A partial perspective view, FIG. 4 is an explanatory diagram of the drive of the paper ejecting belt and rear end regulating plate, FIG. 5 is a perspective view of the vicinity of the paper ejecting section including the device, and FIG. 6 is a plane view of the device. FIG. 7 is a side view and a sectional view of the apparatus in the document section, and FIG. 8 is a diagram illustrating the operation of the arm member in the document section. lOO...Copying machine 200...Document transport device 201...Document placement table 202...Rear edge regulating plate 206...Stack sensor 207...Document set detection sensor 208...Document standby 220. ...Extrusion belt 234...Synchronization sensor (document leading edge detection sensor) 2
35... Original reversal detection sensor 240... Main motor 252... Home position sensor 270... Original classification is loading fi 273... Axis regulating member 273A.
... Bottom dead center plane 273B ... Spiral cam surface 273
C...Bottom dead center plane 273D...Vertical plane 274
...Rotation regulating member 275...Arm member 275A...Arm portion 278...Large diameter pulley 278A...Cam surface 280...Microphone switch 291...Foot interrupter 292...Stop collar Part D...Manuscript

Claims (4)

[Claims] (1) In a circulation type document transport device that separates and feeds the originals one by one from a stack of originals placed in a stack on the document placement table, ejects the documents after transmitting image information, and returns them to the document placement table and stacks them. . A circulation type document conveying device, wherein the sorting arm member for identifying the circulation of the document bundle on the document mounting table is an arm member that moves in a spiral manner. (2) a rotating shaft member that is integral with the dividing arm member and is rotatable; and a shaft regulating member that rotatably supports the rotating shaft member and has a spirally curved surface and a vertical surface that engages with the arm member. and a driving means for driving the rotating shaft member for a predetermined period of time, the rotating shaft member having the arm member is rotated by the driving means, detached from the document surface, and continues to rise along the spiral curved surface, and rises upward. 2. The circulating document conveying device according to claim 1, wherein after reaching the point, the device falls under its own weight along the vertical plane to bring the arm member into pressure contact with the upper surface of the document stack. (3) A claim characterized in that the drive means for driving the rotating shaft is provided with a detection means, and the angular position at which the arm member turns downward from the top dead center is detected, and the drive source of the drive means is turned off. Item 1. The circulating document conveyance device according to item 1. (4) A detecting means is provided below the rotating shaft, and the detecting means generates a completion signal of document circulation conveyance by detecting a lowered position of the rotating shaft.
The circulating document conveyance device described in .