JPH01197234A - Device for carrying copy - Google Patents

Abstract

PURPOSE:To prevent operations of a copying machine provided with no copy by providing a rear end control plate which lets the copy on a copy stacker be advanced to the feeding position, and thereby providing a copy setting detection sensor capable of being moved integrally with said plate. CONSTITUTION:When copies D of specified numbers are set in a copy stacker 201 on which a feed opening 288 and a delivery opening 287 are provided at the front section and at the rear section respectively while being faced with each other, a rear end control plate 202 is advanced from the starting point determined by the largest copy in size or from a specified position until the copy D is advanced upto a feed starting position on the feed opening side 288. In this case, a copy setting detection sensor 289 is simultaneously moved integrally with the movement of the rear end control plate 202 in order to detect whether or not the copy is set at all time. Then, after the lowermost copy D has been fed, both of the rear end control plate 202 and the sensor 289 are retreated so as to be restored to their original positions. Thus, this constitution eliminate copying operations provided with no copy, thereby making it possible to prevent copying of no use.

Description

[Detailed description of the invention] [Industrial application field]

The present invention separates originals stacked on an original stacker one by one, automatically feeds them onto the original glass of a copying device, and after exposure processing on the original glass, returns the originals to the original stacker and repeats the process. The present invention relates to a circulation-type document conveying device that can process documents.

[Background of the invention]

In general, a circulating document feeder (RDF) makes copies one by one in a cycle, and circulates the document a number of times equal to the number of copies to be made. In such devices, separation performance at the paper feed section is extremely important. A conventionally adopted paper feeding system with excellent separation performance is the ``already finished one-up return'' system. This is an operation in which the originals stacked on the original stacker are separated and conveyed one by one from the bottom layer to the processing section, and when the originals after exposure processing are returned to the original stacker, they are returned to the top side of the originals currently being fed. is repeated. There are two ways to accomplish this: one uses suction to attract and separate a sheet, and the other uses a paper feed belt and a stop roller that presses against it to separate the sheets by friction, but the latter is better than the former. has the advantage of being less expensive, more compact, and easier to adjust and maintain.

[Problems to be solved by the invention]

By the way, in the above-mentioned document conveying device that uses the "bottom feed and top return" paper feeding method, for example, the document placed on the document stacker is transferred to the paper feed port provided in front of the stacker. Some paper feeding systems employ a paper feeding method in which the document is advanced to the paper feeding start position, the front edge of the document is aligned with the paper feeding start position, and then the documents are fed one by one. In the above-mentioned paper feeding method, the original placed on the original stacker is pushed forward by the trailing edge regulating plate that is in contact with the trailing edge of the original, and the leading edge of the original begins to be fed into the paper feed slot. When the position is reached, the operation of the rear end regulating plate is stopped. A document sensor I/detection sensor is provided to prevent the device from operating when the copy start button is pressed with no document placed on the document stacker. This sensor detects when a document is brought into contact with the trailing edge regulating plate while it is stopped at its original rear position on the document stacker and the trailing edge position is aligned with the surface of the trailing edge regulating plate. It was fixedly installed on the frame on the fixed side of the document conveying device above the rear end regulating plate so as to detect whether or not the document feeder is set. However, with this method of installing the document setting detection sensor, after the trailing edge regulating plate moves and advances the document, the document moves out of the detection range of the detection sensor, and this occurs only at the initial stage of document placement. Although it is possible to check whether or not the original is set, after the trailing edge regulating plate is moved,
In practice, it is impossible to detect whether or not a document is set. In such an installation state of the document set detection sensor, for example, when the trailing edge regulating plate is stopped at the initial position, after detecting the document set, the trailing edge regulating plate moves forward together with the document and detects the document setting. Even if the original is removed from the original stacker for some reason at a position outside the detection range of the sensor, the copying operation starts, so it is impossible to prevent unnecessary copying.

[Means to solve the problem]

The present invention has been made to solve the above-mentioned drawbacks, and is intended to be used when the document is stopped at its original position on the document stacker, or when the document is slid on the document stacker with its trailing edge being pressed. By constantly detecting whether or not a document is placed on the document stacker, both when the document is placed on the document stacker and when the leading edge of the document reaches the paper feed start position, the document is placed on the stacker. It is an object of the present invention to provide a document conveying device that can prevent unnecessary copying such as starting a copying operation even though the document is not set. The above purpose is to provide a paper feed port at the front of the document stacker and a paper ejection port at the rear, and feed the originals placed on the document stacker into the paper feed port side using the trailing edge regulating member on the paper ejection port side. In the document conveying device configured to advance the document to a paper starting position, a trailing edge regulating plate is provided on the paper discharge port side of the document stacker and can be moved back and forth in sliding contact with the stacker, and the document stacker is disposed in front of the trailing edge regulating plate. A document set detection sensor that detects the presence or absence of a document set above and is movable integrally with the regulation plate; the detection sensor and the trailing edge regulation plate are moved forward starting from the maximum document size or a specified position; This is achieved by a document conveying device characterized in that it is provided with a control means for moving the document backward to an older position or a designated position, and is configured to constantly detect the presence or absence of a document on a document stacker.

【Example】

Embodiments of the present invention will be described in detail based on the accompanying drawings. In FIG. 1, 100 is a copying machine main body, and 200 is a document conveying device. The document conveying device 200 includes a document stacker 201 whose front part is closed.
1, there are provided a trailing edge regulating plate 202 for abutting the rear end of the document tray when setting the document tray, and width regulating plates 203, 203 for regulating the width direction of the document tray. This width regulating plate 203.203 is the original stacker 201.
The racks 205 and 205 are connected to a pair of racks 205 and 205 that can alternately slide sideways across the pinion gear 204 on the lower surface, and can be moved symmetrically around the center, and a sensor (not shown) detects the movement position. This allows you to read the horizontal size of the original. Further, the trailing edge regulating plate 202 is connected to the document stacker 201.
It has a function of pushing out the leading edge of the document tray set above to the detection position (localization value) of the stack sensor 206. 28
Reference numeral 9 denotes a document setting detection sensor that detects whether a document tray is set on the document stacker 201. The detection sensor 289 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 feeder is stopped at the original position on the document stacker 201, or when the document feeder is sliding on the document stacker 201 with its rear end being pressed, the document feeder moves its leading edge to the paper feeding start position. In either case, it is always detected whether or not a document tray is set on the document stacker 201, so that copying can be performed even if the document tray is not set on the document stacker 201. It is possible to prevent unnecessary copying such as entering the operation. 207 is in the raised position when the original document moves forward due to the pushing action of the trailing edge regulating plate 202, and when the leading edge of the original reaches the detection position of the stack sensor 206, it is lowered by the signal from the stack sensor 206 to release its own weight. This is a gate member that is placed on the document plate. The gate member 2
07 is a paper feed port 288 at the front of the document stacker 201
is placed close to. This gate member 207 has the function of holding down the document sheet to be fed by its own weight, and as described later, it abuts the leading edge of the document sheet that has gone through the processing section and returned onto the document stacker 201, and then the next sheet is fed. It has a function to align the leading edge for paper feeding and to reliably distinguish between restacked originals and originals being fed. In order to effectively utilize these functions, in this embodiment, ribs 2 are provided on the upper surface of the document stacker 201 at appropriate intervals along the paper feeding direction, as shown in FIG.
01a, and a plurality of protrusions 207a are provided at the lower edge of the gate member 207 corresponding to between the ribs 201a, forming a so-called comb-teeth shape. That is, by deforming the document stack on the document stacker 201 into a waveform as shown in FIG. 3 by means of the ribs 201a and the comb-teeth-shaped protrusions 207a, the document stack during paper feeding is made to have some stiffness. This makes it possible to effectively prevent the leading edge of the returned document from slipping under the gate member 207. The gate member 2
Reference numeral 07 is formed in a planar shape, and both side surfaces 207b and 207c are a pair of brackets 210 fixed to the left and right sides of the front frame 209 of the document conveying device 200 with screws or the like, as shown in FIG. The left and right gate levers 212 have their proximal ends loosely attached to the shaft 211 which is rotatably mounted on the upper side of the bracket 210. It is pivotally supported by a pair of auxiliary levers 213 and the tips of 213. The gate lever 212, 212 has projecting parts 212a, 212a on the upper part of its inner edge side, and a pair of left and right push-up pins 214, 214 installed on the shaft 211 correspond to the projecting parts 212a, 212a on the lower surface thereof. It has become. This shaft 211 has a sector gear 2 fixed to its end.
Small gear 21 coaxial with gate cam gear 216 via 15
6A, and the gate cam gear 216 is connected to an output gear 217A of a drive source 217 that can be rotated forward and backward. Therefore, when the shaft 211 rotates clockwise under the drive from the gate drive source 217, the push-up pin 214.2
14 moves the gate lever 212.212 to its overhanging part 2
12a and 212a to raise the gate member 207 as shown in FIG. 4(A). When the shaft 211 is driven by the gate drive source 217 and rotates counterclockwise in the raised position of the gate member 207, the gate levers 212 and 212 mounted on the push-up pins 214 and 214 are moved downward. The gate member 207 is lowered as shown in FIG. At this time, the push-up pins 214, 214 are designed to escape at an angle greater than the angle at which the gate member 207 hits the document on the document stacker 201. Therefore, the gate member 207 is configured to press down the document on the document stacker 201 with its own weight. When the gate member 207 moves up and down, the front surface of the gate remains substantially perpendicular to the upper surface of the document stacker 201 in order to cause the auxiliary levers 213, 213 to follow the movement. That is, gate member 2
No. 07 is designed so that the front angle of the gate can be placed almost perpendicular to the originals regardless of the number of originals. The gate cam gear 216 is provided with a tongue piece 219 that blocks the detection sensor 218 at its initial position. The sensor 218 determines the home position of the gate cam gear 216 when it is blocked by the tongue piece 219,
The driving source 217 is rotated forward and backward by a required angle. As the drive source 217 in this case, it is preferable to use a stamping motor that can be pulse controlled. Reference numeral 220 denotes a push-out belt for pushing out the document sheet at the fixed position to the paper feeding position, as described above. Reference numeral 221 denotes a paper feed belt that feeds out the document sheets at the paper feed position from the lowest layer, and 222 a stop roller that comes into contact with the paper feed belt 221 to prevent double feeding of the document sheets.These constitute separation means. The paper feed bells 1 to 221 have electromagnetic clutches 22 installed on their shafts.
3 and is stretched between a driving roller 225 and a driven roller 226, which are connected to the main motor 250 via a one-way control means (not shown), and the upper belt surface thereof slightly protrudes from the rib 201a of the document stacker 201. There is. A spring clutch 224 is attached to the shaft of the stop roller 222.
is installed. The spring clutch 224 is operated by pressing the protrusion 224b of the outer cylindrical body 224a downward with the clutch lever 227 as shown in FIGS.
24c is loosened from spring pins 224d and 224e to enable free rotation (driven rotation) of the stop roller 222, and the clutch lever 2 is attached to the protrusion 224b of the outer cylinder 224a.
27 is inactive, the rotation of the stop roller 2220 can be regulated. This clutch lever 2
27 is pivotally supported in a hanging manner at the tip of an arm 228 fixed to the shaft 211 in a direction opposite to the push-up pin 214 of the gate lever. Therefore, the gate member 207 is rotated by the rotation of the shaft 211 as shown in FIG.
When the clutch lever 227 is lowered and pushes the protrusion 224b of the spring clutch 224 clockwise, the gate member 207 rotates the shirt l-211 in the opposite direction as shown in FIG. 4(B). When the document is lowered and placed on the document tray, the clutch lever 227 upwardly separates from the protrusion 224b of the spring clutch 224.
is restored to its original position by the action of a built-in spring, and the rotation of the stop roller 222 is restricted. The extrusion belt 220 is formed of a perforated belt stretched between so-called half-moon rollers 229A and 229B whose outer periphery is partially cut out. One half-moon roller 229A is connected to the one-turn spring clutch 229A as shown in FIG.
0 to the main motor 250 as well as the paper feed belt.
The driving force is obtained from. The one-rotation spring clutch 230 has a clutch lever=2 in which a protrusion 230b provided on an outer cylinder body 230a is rotatable in a seesaw shape around a pivot point 231A as shown in FIG. 8(A).
When the rotation of the outer cylindrical body 230a is restricted by hitting the tip of the outer cylinder 230a, the clutch spring 230c built into the clutch spring 230c loosens from the spring posts 230d and 230e (see Fig. 7), and the driving force from the main motor 250 is cut off. At the same time, the tip of the clutch lever 231 is in the state shown in Fig. 8 (B
), the protrusion 2 of the outer cylindrical body 230a of the spring clutch 230
30b, the clutch spring 230c tightens the spring posts 230d and 230e, and the drive from the main motor 250 is transmitted to the half-moon roller 229A. The rear end side of the clutch lever 231 is pressed against the cylindrical portion 216a of the gate cam gear 216 by the spring force of a tension spring 231B. A cam-shaped portion 216b is provided on a part of the circumference of this cylindrical portion 216a. Therefore,
The gate cam gear 216 is the driving source 21 for the gate member 207.
When the cam-shaped portion 216b presses down the rear end side of the clutch lever 231, the tip of the cam-shaped portion 216b comes off from the protrusion 230b of the outer cylindrical body 230a of the spring clutch 230. This swinging of the clutch lever 231 causes the gate member 207 to move downward when the gate member 207 is lowered.
This is done in the rotation region of the gate cam gear 216 that is unrelated to the vertical drive of No. 7. That is, as described above, the gate cam gear 216 has a home position (indicated by the symbol P in FIG. 8) determined by the initial position detection sensor 218 and the tongue piece 219.
A rotation area S1 in the counterclockwise direction from the point P is used for vertical movement of the gate member 207, and a rotation area S2 in the clockwise direction is used for swinging the clutch lever 231. By the way, the gate cam gear 21 used for this swing
In the rotation region S2 of No. 6, the pusher pin 214 has escaped from the gate lever 212, and the sector gear 215 is in a tooth-skipping state with the pinion gear 216A at its tooth end. As mentioned above, the tip of the clutch lever 231 is connected to the outer cylindrical body 23.
When the half-moon roller 229A comes off the protrusion 230b of 0a and the main motor 250 starts rotating the half-moon roller 229A, the gate cam gear 216 rotates counterclockwise due to the reverse rotation of the gate drive source 217, and the rear end side of the clutch lever 231 moves toward the cam. The spring clutch 230 has come off the shaped portion 216b and is returned by the spring 231B to a position close to the outer cylindrical body 230a of the spring clutch 230 whose tip has passed past the protrusion 230b, so that the spring clutch 230 is rotated once by the half-moon roller 229A.
The protrusion 230b of the outer cylinder body 230a is again clutched/<
-231 and disconnects the driving force from the main motor 250. Therefore, the half-moon roller 229A always reliably rotates once and then stops. Further, as shown in FIG. 2, the extrusion belt 220 is provided in through holes 232 arranged side by side at a plurality of locations (three locations in the figure) on the document stacker 201. The peripheral edge of the through hole 232 is raised to the same height as the rib 201a of the document stacker 201, and the front side in the paper feeding direction is an inclined surface 232a to prevent the leading edge of the document from getting caught. When the notch of the half-moon roller 229A1229B is upward as shown in FIG. 9, the upper belt surface is sunk into the through hole 232, as shown in FIG. 9(B).
When the circumferential areas of the half-moon rollers 229A and 229B are upward, they protrude. In other words, the document stacker 201
The original in the upper position is half-moon rollers 229A, 229.
One rotation of B causes it to protrude from the through hole 232. It is extruded by the friction of the extrusion belt 220. in this case,
Since the paper feed belt 221 is stationary with the power from the main motor 250 cut off by the action of the electromagnetic clutch 223, the leading edge of the pushed out document is placed in the nip (separation area) between the paper feed belt l-221 and the stop roller 222. (point) in a wedge-like manner. 233 connects the extrusion belt 220 to the document stacker 201
A suction box that surrounds the bottom of the
The suction box 233 attracts the bottom layer of the document by the suction action of its suction fan 234 in the gap between the through hole 232 and the extrusion belt 220 and the belt hole, and the extrusion force of the extrusion belt 220 becomes effective. It is configured so that it can be used effectively. Reference numeral 235 denotes a paper feeding mechanism 290 related to the above-mentioned document feeding.
The copying machine 1 serves as a processing section 101 for processing originals sent out from the machine.
Anterograde path guided on the platen glass 102 of 00, 2
Reference numeral 37 denotes a reversing path for reversing the document once fed onto the platen glass 102 before or after exposure. The reversing path 237 is used to reverse the even-numbered pages of a double-sided document so that it faces the platen glass 102 surface, and to re-invert and correct the order of the pages when the exposed document is returned to the document stacker 201. It draws an upward loop from the same surface as the platen crow 102 and merges with the upper side of the forward path 235. Reference numeral 238 denotes a conveyance roller provided halfway along the forward path 235, and 239 and 240 denote conveyance rollers provided halfway along the reverse path 237. These transport rollers 238 and 239
, 240 are connected to the main motor 250 via a one-way control mechanism so that they can always rotate in the same feeding direction. Reference numeral 241 is a conveyor belt for conveying the original in the forward and reverse directions on the upper surface of the platen crow 102 . This conveyor belt 241 is stretched between a first roller 242 on the sheet feeding side and a second roller 243 on the sheet discharging side, which are connected to a main motor 250 via a forward/reverse switching means 251. A tension roller 244 is in pressure contact with the upper belt surface near the first roller 242, and the lower belt surface is brought into sliding contact with the platen glass 102 by a plurality of presser rollers 245. The first roller 242 and the second roller 243 are connected to each other by a timing belt 246 as shown in FIG. 1θ. In this case, the timing pulley 247 on the first roller 242 side is fixed to the first roller shaft 242a, and the timing pulley 248 on the second roller 243 side is attached to the second roller shaft 243a via a one-way clutch 249. Further, the circumferential speed of the first roller 242 is configured to be slightly faster than the circumferential speed of the second roller 243 driven via the one-way clutch 249. Therefore,
When the conveyor belt 241 rotates in the forward direction (arrow in FIG. 1O), it runs by the driving force from the first roller 242, and the lower belt surface is on the slack side. In this case, the second roller 243 is designed to slip between it and the one-way clutch 249, but if the conveyor belt 241 slips for some reason, for example, between it and the first roller 242, its driving force is insufficient. The second roller 243 becomes the driving side due to the action of the one-way clutch 249, which locks when the running speed of the belt decreases due to the lack of transmission, and the conveyor belt (241)
It is now possible to drive. Further, the conveyor bell 1
241 in the opposite direction (counterclockwise), the one-way clutch 249 is locked and the second roller 243 becomes the drive side of the conveyor belt 241. That is, the conveyor belt 241 sometimes runs with the first roller 242 on the driving side, and sometimes runs with the second roller 243 on the driving side. This is the original platen glass 10
This is particularly effective when synchronized exposure is performed while feeding on the 2nd. Reference numeral 103 denotes a document stopper provided at the end of the paper discharge side of the platen crow 102, and as shown in FIG. A solenoid 106 is pivotally supported by a solenoid 106 and is connected to the other end of the operating lever 104.
By the action of the spring 107 that opposes this, it is possible to move in and out of the platen glass 102. This document stopper 103 is an exposure optical system that is provided directly below the platen glass 102 and allows a mode to be selected between fixation in a fixed position and movement while conveying the document on the platen glass 102 at a synchronous exposure speed using a conveyor belt 241 as in the RDF mode. System 1
When creating an image on the drum by exposure with 10 fixed, it is lowered from the platen glass 102, and the ADF or SD
When the original is stopped at the exposure position on the platen glass 102 and an image is created on the drum by exposure while moving the optical system 110, as in the F mode, it is necessary to protrude above the platen glass 102. It operates. 255 is a paper discharge guide plate continuous to the exit side of the platen glass 102, and 256 is a paper discharge belt. The paper ejection belt 256 is pivotally supported immediately after the document stacker 201, and is movable horizontally along the upper and lower surfaces of the document stacker 201 in conjunction with a drive roller 257 connected to the main motor 250 via a one-way control mechanism. Pivotally supported upper and lower end rollers 258, 259 and the paper ejection guide plate 25
Auxiliary roller 260.2610 pivoted at a position close to 5
The rear side of the document stacker 201 is stretched around the rear side of the document stacker 201 in a C-shape by a group of rollers, and the documents sent out from the conveyor belt 241 can be conveyed in the paper ejection direction by rotation of the drive roller 257 in a fixed direction. It has become. Upper and lower end rollers 25 of the paper ejection belt 256
8.259 is the document conveying device 200 as shown in FIG.
The upper stage moving body 265 and the lower stage moving body 266 are slidably held via roller members in two parallel horizontal grooves 263 and 264 provided on both sides of the frame 262. The moving bodies 265 and 266 are sprockets 267A, 267B, 268A, and 268B that are pivotally supported on both sides of the skeleton 262.
It is connected to the upper and lower sides of a chain 269 stretched through attachments 270 and 271. As shown in FIG. 14(A), the front lower sub-block 1-267A is connected to an intermediate gear 272 by a chain drive source 272 that can be forward and reverse.
It is connected via B. Therefore, the chain drive source 27
When the chain 269 runs in the forward and reverse rotation of 2, the upper end roller 258 and the lower end roller 259 move oppositely to each other, and the belt tension of the paper ejection belt 256 is always maintained constant. becomes. The movement mechanism of the paper ejection belt 256 is the document stacker 20.
This mechanism is configured as a movement control mechanism for the trailing edge regulating plate 202 that forms the trailing edge when a document tray is set on the upper moving body 265. It is attached to cover the front of 258. As shown in FIG. 12, its lower edge is provided with a convex portion 202a that 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 stacker 201, and is pressed by this convex portion 202a. It is designed so that the original does not get stuck underneath. In FIG. 14, 273 is a home position sensor of the rear end regulating plate 202, and this sensor 273 is a home position sensor of the rear end regulating plate 202.
The position blocked by the blocking member 274 provided on the actument 270 coupled to the upper side of the door 269 is determined as the home position of the rear end regulating plate 202. This home position is a position where the rear end of the maximum size (for example, A3 size) document can be abutted. The chain drive source 272 is connected to the control means 7 as shown in FIG.
21 controls the forward/reverse rotation and the amount of rotation. When the original setting detection sensor 289 confirms that the original is set on the original stacker 201, the control means 721 causes the chain drive source 272 to rotate forward in response to the ON signal of the copy button, and returns to the home position 201.
The rear end regulating plate 202 is moved forward starting from p+. The document set detection sensor 289 moves integrally with the rear end regulating plate 202 to detect the document being moved. Therefore, if the document stacker 201 is removed from the document stacker 201 during movement or immediately after the movement is completed, it is immediately detected, a detection signal is transmitted to the control means 721, and the chain drive source 272 is stopped. Zeru. When the leading edge of the document is detected by the stack sensor 206 and the detection signal is received, the chain drive source 272
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, it may be moved back to the home position, but in this embodiment, it is moved back by the size of the document from the front of the gate member 207. In other words, the document is moved back by an amount corresponding to the amount by which the leading edge of the document passes through the gate member 207. This is effective for minimizing the amount of advance of the trailing edge regulating plate 202 when refeeding the document after it has circulated 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 273.
It is provided with means 723 for detecting the amount of movement from 02P, 202P2, to -202Pn, and means 722 for determining the document size with respect to the amount of movement. That is, the determining means 722 determines a plurality of document size information (
For example, A4, A3, B4, B5, etc.)) and a selection circuit that selects necessary document size information from the memory circuit based on the output from the movement amount detecting means 723. Therefore, the size of the document is
The determination result can be determined based on the amount of movement from the initial position to the forward movement point of the chain drive source 272, and the determination result is output to the control means 721, which controls the amount of rotation of the chain drive source 272 during reverse rotation, and controls the rear end regulating plate 202 as described above. The document can be correctly retreated to the specified position corresponding to the document size. Further, the determining means 72
In the memory circuit 2, non-conforming size information (for example, B5 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 output to the main motor control section. It has become. Needless to say, the result of the determination by the determining means 722 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 275 and 276 refer to presser rollers 2 which are in contact with the paper ejection belt 256 from the outside of the paper ejection kite plate 255 through the through holes at positions corresponding to the auxiliary rollers 260 and 261.
Reference numeral 77 denotes a ceiling guide plate whose base end is hingedly connected to the upper rear end of the frame 262 on both sides of the document conveying device 200, and 278 a ceiling guide plate that connects the upper end roller 258 to the upper stage moving body 265, and the paper ejection bell l-256. A paper discharge log guide plate 279 facing the upper surface of the upper belt portion with a slight gap is a press roller that contacts the paper discharge belt 256 through a through hole from the upper surface of the paper discharge log guide plate 278. A document setting detection sensor 289 detects whether a document tray is set on the document stacker 201. The document set detection sensor 289 is fixedly mounted on the paper discharge log guide plate 278. The ceiling guide plate 277 is provided with a plurality of ribs 280 oriented in the paper ejection direction on the lower surface which serves as a guide surface, so that directionality can be imparted to the document. The concave grooves 281 provided on the upper edge of the upwardly inclined rear plate of the ceiling guide plate 278 fit in a rectangular shape, and the document that has advanced along the guide surface of the ceiling guide plate 277 is placed between the paper discharge guide plate 278 and the paper discharge belt 256. We make sure that we can guide you accordingly. FIG. 13 is a sectional view of the installation part of the document set detection sensor 289. The document set detection sensor 289 is fixedly mounted on the paper discharge plate 278 with its front portion protruding forward. A through hole 2 is provided on the front lower surface of the detection sensor 289.
89a is bored, and the projected light from inside the detection sensor 289 and the reflected light to the detection sensor are transmitted through the through hole 28.
9a. The detection sensor 289 is a detection sensor in which a light projecting section and a light receiving section, each of which includes a light emitting LED and a phototransistor, are provided within the same frame. Light emitter (light emitting L)
The projection light projected from the rear end regulating plate 202 passes through the through hole 289a and reaches the reflecting 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 passes through the through hole 289a again and reaches the light receiving section (photo 1 to transistor). FIG. 16 is a circuit diagram of the document set detection sensor 289. In the figure, D1 is a light emitting LED, and PTr is a phototransistor. Also, the P attached to the tip of the lead wire
1 to P3 are bin numbers of a 3-bin connector (not shown) and are used as a guide when connecting wires to the connector. If there is no original on the original stacker 201, the projected light from the LED is reflected by the reflection plate 202, and then the reflected light reaches the phototransistor. When the phototransistor PTr detects the reflected light, it transmits a detection signal. Original set detection sensor 289
constitutes a control circuit with the control means 721 via the 3-pin connector, and includes phototransistors PTr,
When detects the reflected light, the voltage at the end of the lead wire whose pin number is P2 in the figure increases, and a current corresponding to the voltage increase flows through the circuit. This current is a detection signal and is transmitted to the control means 721 to stop the operation of the chain drive source 272. Reference numeral 282 denotes a circulation paper discharge path A provided in the middle of the paper discharge guide plate 255 that directs the processed original to the document stacker 201.
and an external paper discharge path B toward a paper discharge tray 283 outside the machine.
When the rear end regulating plate 202 returns to the home position, it moves to open the external paper discharge path B, and when the rear end regulating plate 202 is not at the home position, it moves to open the circulating paper discharge path A. This switching action may be accomplished using a solenoid or other suitable mechanical mechanism. Reference numeral 284 denotes a manual feed plate whose base end is hinged to the top surface of the top end of the ceiling guide plate 277. Usually, the manual feed plate 284 is folded so as to overlap the top surface of the ceiling guide plate 277 as shown in FIG. When feeding documents one by one in mode, the document stacker 20 uses the hinge joint as a fulcrum.
It can be expanded to cover 1. At this time of expansion, the tip of the manual feed plate 284 reaches near the paper feed bell l-221. Further, the manual feed plate 284 has a mark indicating the size of the document to be fed on the top surface when unfolded, so that the document insertion position can be known. Furthermore, it is convenient to configure the SDF actuator (not shown) to be turned on when the manual feed plate 284 is unfolded. In the embodiment described above, the originals are stacked with the copy side facing up, aligned in page order from the top, and set with their rear ends abutting against the rear edge regulating plate 202 at the home position. Furthermore, after regulating the width direction with the width regulating plate 203.203, inputting the number of copies to be made and turning on the copy button, the gate drive source 217 that drives the gate member 207 is activated, and the gate member 207 is stacked underneath. Raise it to a position where it can fully enter. Next, the chain drive source 272 is started, and the intermediate gear 272
The upper moving body 2 rotates the chain 269 normally through the B1 sprocket 267A, and is connected to the upper and lower sides of the chain 269 through attachments 270 and 271.
The upper end roller 258 axially mounted on the lower stage moving body 266 is moved forward, and the lower end roller 259 axially mounted on the lower stage moving body 266 is moved rearward. Therefore, the trailing edge regulating plate 202 attached to the upper stage moving body 265 so as to cover the front side of the upper end roller 258 moves forward while pushing the trailing edge of the document, and moves the leading edge of the manuscript under the gate member 207. However, when the leading edge of the document stack is detected by the stack sensor 206, the chain drive source 272 is stopped by the action of the control means 721, the gate drive source 217 is reversed, and the gate member 207 is lowered. . At this time, the pin 214 installed in the shaft 211 rotates to a position sufficiently away from the gate lever 212 and escapes, so that the gate member 207 can always press the top surface of the document downward with its own weight regardless of the amount of documents. Further, the lower edge of the gate member 207 has a comb-like shape,
Together with the upper surface rib 201a of the document stacker 201, the document is pressed against the paper feed bell 1-221 while being deformed into a waveform. As mentioned above, the push-up bottle 21 is pressed against the gate lever 212.
4 is sufficiently far away, the gate cam gear 216
is rotated by the gate drive source 217, and the cam-shaped portion 2
16b, the half-moon roller 229. When A and 229B are connected to the main motor 250 and the extrusion belt 220 is run,
The document is pushed toward the nip between the paper feed belt 221 and the stop roller 222. At this time, the paper feed belt 221 remains unrotated due to the action of the electromagnetic clutch 223, so the pushed out document enters the nip between the paper feed belt 221 and the stop roller 222 in a wedge shape before the lower layer. and stop. Next, the electromagnetic clutch 223 is turned on, and the paper feed belt 221 rotates in the paper feeding direction. At this time, the paper feed belt 22
Since the stop roller 222 that is in contact with
The second and subsequent document bundles are stopped by a stop roller 222 to prevent double feeding. This paper feed belt 2
When the belt 21 rotates, the extrusion belt 220 also starts in synchronization, and during one rotation, it attracts and separates only the bottom document from the stack of documents stacked above it, and pushes it in the paper feeding direction. It acts to release. That is, the stop roller 222
This will further improve the double feed prevention function. 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 221 enters the forward path 235, is nipped by a conveyance roller 238 provided on the way, and is conveyed toward the platen glass 102 and the conveyance belt 241 at a synchronous exposure speed. Ru. The electromagnetic clutch 223 is turned off at a timing for each size after the leading edge of the document crosses a synchronization sensor 285 provided midway through the forward path 235 (directly below the conveyance roller 238). The original transported by the transport roller 238 is transferred to the transport bell l-
At step 241, the drum is conveyed over the platen glass 102 at a synchronous exposure speed and exposed using the fixed optical system 110 to create an image on the drum. The exposed document moves upward along the paper discharge guide plate 255 and is discharged toward the document stacker 201 by the paper discharge roller 256. In this case, a presser roller 279 is brought into contact with the roller support portion of the paper ejection belt 256 through a through hole from the outer surface of the paper ejection guide plate 278 and the paper ejection guide plate 255 constituting the paper ejection path.
．． 275 and 276 support the document, paper ejection port 2
Even if 87 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 will never be nipped between the conveyor belt and the paper ejection port 287, and the document will not be ejected. . Further, the documents discharged onto the document stacker 201 are stacked again with their front and rear ends aligned by the gate member 207 and the trailing edge regulating plate 202, and their widths aligned by the width regulating plates 203 and 203. Therefore, the paper feeding performance during the next paper feeding is improved. The above-mentioned feeding operation is repeated until the document under the gate member runs out by changing the feeding timing and synchronous conveyance speed determined for each copy size and copy magnification. Then, when the stack sensor 206 detects that there are no more documents under the gate, and the discharge sensor 286 detects that the last document has been ejected, the gate member 207 is raised again and the trailing edge regulating plate 202 stacks the documents. The above operation is repeated until the set number of copies is completed. When the set number of copies is completed and the number of copies is detected by the paper discharge sensor 286, 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 RDF 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
Although the exposure optical system 110 is in fixed position mode,
When this is set to ADF mode, the exposure optical system 11
0 is the movement mode, and the original stopper 103 provided at the end of the platen glass 102 on the paper ejection side protrudes above that surface, hits the original and stops at that position (that is, the exposure position), and the exposure optical system 110 moves and copies the set number of copies, the original is moved to the original stopper 10.
3 and reactivation of the conveyor belt 241, the switching claw 2 provided in the middle of the paper ejection guide plate 255 is sent in the ejection direction.
82 and is discharged from an external paper discharge port to a paper discharge tray 283. Furthermore, in the case of single-sided copying of a double-sided original in RDF mode, when the original sent from the original stacker 201 is fed to the platen glass 102 via the forward path 235,
Since the last page is on top on the platen glass 102, first, after stopping the document fed onto the surface of the platen glass 102, the transport bell 241 is reversed, and the document is sent to the reversing path 237. The original is turned over in a somersault manner, and the final page is exposed on the platen glass 102 by the fixed optical system 110. - After the exposure is completed, the conveyor bell l-241 is reversed again, the original is passed through the reversing path 237 again, the page order is corrected, the other page side is facing down, and the original is exposed on the platen glass 102 and transferred to the original stacker 202. Return to. By repeating the operations from ■ to ■, a single-sided copy of a double-sided original is completed. Therefore, in order to make a double-sided copy of a double-sided original, when the above-mentioned step (2) is activated, return it to the original stacker 201 without exposing it, and -
In one cycle, only even numbered pages are copied, and in the second cycle, odd numbered pages are copied. Naturally, when copying odd-numbered pages, no reversing operation is required. Of course, copy machine 1
The feeding operation of the transfer paper on the 00 side is also performed in accordance with the above-mentioned document conveyance operation.

【Effect of the invention】

According to the present invention, there is provided a trailing edge regulating plate that moves the original on the original stacker forward to the paper feeding start position, and an original set detection sensor that is movable integrally with the trailing edge regulating plate. Since the document stacker always detects whether or not the document is placed on the document stacker, it is now possible to detect whether or not the document is set on the document stacker before, during, or after the document is moved. It is now possible to provide a document conveying device that can prevent unnecessary copying, such as operating the copying machine without using the copying machine.

[Brief explanation of the drawing]

1 to 15 show embodiments of the present invention, FIG. 1 is a front sectional view of the document conveying device, FIG. 2 is a perspective view showing the document stacker and paper feeding mechanism, and FIG. 3 is a gate member. An explanatory diagram showing a deformed state of a document pressed on a document stacker,
4(A) and 4(B) are explanatory diagrams showing the operating state of the gate member, FIG. 5 is a partially cutaway front view of the spring clutch provided on the stop roller shaft, FIG. 6 is a side sectional view of the same, and FIG. Figure 7 is a perspective view of the half-moon roller one rotation control mechanism, Figure 8 (A), (
B) is an explanatory diagram showing the operating state of the same rotation control mechanism, No. 9
Figures (A) and (B) are explanatory views showing the operating state of the extrusion belt (half-moon roller), Figure 10 is a perspective view of the drive system of the conveyor belt, Figure 11 is a perspective view showing the operating mechanism of the document stopper, Fig. 12 is a perspective view showing the rear side of the document stacker, Fig. 13 is a sectional view of the installation part of the document set detection sensor on the rear side, and Fig. 14 shows the drive mechanism of the paper ejection belt and the rear end regulating plate. FIG. 15 is a perspective view of the main part, FIG. 15 is an explanatory diagram of the same, and FIG. 16 is a circuit diagram of a document set detection sensor. 200... Document conveyance device 201... Document stacker 202... Trailing edge regulating plate 202b... Reflective plate 2
06... Stack sensor 207... Gate member 278... Paper discharge log guide plate 287... Paper discharge port 288... Paper feed port 28
9... Original set detection sensor 290... Paper feeding mechanism 721... Control means D.
・Manuscript

Claims (1)

[Claims] The document stacker has a paper feed slot at the front and a paper output slot at the rear, and the document placed on the document stacker is moved to the paper feed start position on the paper feed slot side by the trailing edge regulating member on the paper output slot side. In the document transport device configured to move forward, a trailing edge regulating plate that slides on the stacker and can move back and forth is provided on the paper discharge port side of the document stacker, and a document set on the document stacker is disposed in front of the trailing edge regulating plate. A document set detection sensor that is movable together with the regulation plate detects the presence or absence of the document, and the detection sensor and the trailing edge regulation plate are moved forward from the maximum document size or the designated position as a starting point, and from the forward point to the old position or What is claimed is: 1. A document conveying device, comprising a control means for moving the document backward to a specified position, and configured to constantly detect the presence or absence of a document on a document stacker.