JPS63202545A - Original transporting device - Google Patents

Abstract

PURPOSE:To obtain the same direction of an original in the manual and automatic operation by providing a paper feeding belt and a stop roller and using in common a paper feeding port for feeding documents one by one and a paper feeding port where the stop roller can be trailing-revolved in manual operation. CONSTITUTION:In the automatic paper feed, an original 4 on a stacker 3 is pushed out by a regulating plate 5. Then, a gate 7 is raised, and when the top edge of the original 4 is detected by a sensor 27, the gate 7 lowers to press the original 4, and the revolution of a stop roller 22 is suspended, and the originals 4 are separated one by one from the lowermost part by the drive of a belt 21, and sent onto a platen 8, and again loaded onto the stacker through a circulation passage. In the manual insertion, a manual insertion plate 84 is extended, and the original is inserted between the gate 7 and the belt 21. Since the stop roller 22 is in free turning at this time, the inserted document is sent onto the platen 8 smoothly, and discharged outside the machine by a selecting lever 82. Since a feeding port is used in common, the need of correcting the direction of the original is avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a document conveying device that can feed a document onto a platen glass of a copying machine.

[Background of the invention]

-a, this type of document feeder separates the documents stacked on the document stacker one by one and feeds them onto the platen glass of the copying machine, and the documents after exposure processing are transferred to the outside of the machine on the platen glass. There are two types of document transport devices: one that discharges the document to an ejection tray (ADF) and the other that allows the document to be returned to the document stacker and fed repeatedly (RDF).These document conveyance devices are equipped with a document separation mechanism at their paper feed port. Therefore, if perishable originals that cannot withstand being passed through the separation mechanism or originals that are difficult to separate with one separation mechanism (such as pasted originals or folded originals) are automatically circulated, the reliability will be significantly reduced. It will be necessary to do so. Therefore, in order to be able to feed such originals, conventionally, as shown in FIG. ,
Entrance section 14 with conveyor belt 143 stretched over its upper surface
A manual paper feed plate 145 is provided in communication with ADF and RD.
It is possible to manually feed a document onto the platen glass without passing through the separation mechanism of the paper feed port 141 of F.

146 is an external paper discharge board.

However, in the conventional case described above, there are two paper feed ports, which is not only extremely troublesome to operate, but also
With originals fed in DF mode.

Since the copy side of a document fed in the manual feed mode is reversed, selecting these modes causes the inconvenience of reversing the front and back of the document.

[Purpose of the invention]

This invention is intended to solve the above problem.

It is an object of the present invention to provide a document conveying device that has good operability and does not require the trouble of reversing the front and back of the document. Also,
Another object is to provide a highly reliable document conveying device with a simplified mechanism.

[Structure of the invention]

In order to achieve the above object, the present invention includes a paper feed port that separates documents stacked on a document stacker one by one starting from the lowest one and feeds the documents onto a platen glass of a copying machine; In the document conveying device, the document conveying device is provided with a circulation paper discharge port for returning processed documents to a document stacker, and an external paper discharge port via a switching claw in the middle of the path toward the circulation paper discharge port.

The paper feed port having the separation mechanism and the manual paper feed port are used in common to simplify the structure and to allow documents to be oriented in the same direction.

〔Example〕

Next, the present invention will be explained based on examples with reference to the accompanying drawings.

In FIG. 1, 1 is a copying machine that can select between a copy mode with a moving exposure optical system and a copy mode with a fixed exposure optical system, and 2 is a main body of the document conveying device (hereinafter referred to as the main body).
The main body 2 is a document stacker 3 whose front part is curved.
On the document stuff car 3, there are provided a trailing edge regulating plate 5 against which the trailing edge of the document 4 is abutted when setting the document 4, and width regulating plates 6, 6' for regulating the width direction of the document 4. There is. The width regulating plates 6.6' are connected to racks 6b and 6b' which can alternately slide laterally across the pinion gear 6a on the lower surface of the document stacker 3, and are movable symmetrically about the center. The horizontal size of the document can be read by detecting its movable position with two sensors (not shown). Also,
The trailing edge regulating plate 5 has a function of pushing out the leading edge of the document 4 set on the document stacker 3 to the detection position (regular position) of the stack sensor 27.

7 is in the raised position when the document 4 moves forward due to the pushing action of the rear end regulating plate 5, and when the leading edge of the document reaches the detection position of the stack sensor 27.

This gate member is lowered by a signal from the stack sensor 27 and placed on the original 4 by its own weight. This gate member 7 has the function of holding down the document 4 to be fed by its own weight, and as described later, it hits the leading edge of the document that has passed through the processing section 8 and returned onto the document stacker 3 for the ninth feeding. It has a function that aligns the leading edge of paper and reliably distinguishes between restacked originals and currently fed originals. In order to effectively exhibit these functions, in this embodiment, ribs 3a are provided on the upper surface of the document stuff car 3 at appropriate intervals along the paper feeding direction as shown in the second figure, and the lower end of the gate member 7 is provided with ribs 3a. A plurality of protrusions 7a are provided on the edge corresponding to the gaps between the lips 3a, forming a so-called comb-teeth shape. That is, by deforming the original on the original stacker 3 into a waveform as shown in the third figure by the ribs 3a and the comb-shaped protrusions 7a, the original 4 being fed is given stiffness, while the original being returned is This effectively prevents the tip of the gate from slipping under the gate.

The gate member 7 is formed into a U-shape in plan, and both side surfaces 7b and 7c are brackets 10 and 10 fixed to the front frame 9 of the main body 2 with screws or the like, as shown in the second figure.
The left and right gate levers 12 and 12' have their proximal ends loosely attached to the shaft 11 which is rotatably mounted on the shaft 11 above the bracket. The auxiliary lever 13 and the tip of the auxiliary lever 13' are pivotally supported. The gate lever 12, 12' has projecting parts 12a, 12a' at the upper part of its inner edge side, and a push-up pin 1 correspondingly implanted in the shaft 11 on the lower surface thereof.
4.14' is set to hit. This shaft 1
1 meshes with a small gear 16' coaxial with a gate cam gear 16 via a sector gear 15 fixed to its end, and the gate cam gear 16 is connected to an output gear 17 of a drive source 17 that can be reciprocated.
’ is connected. Therefore, when the shaft 11 is driven by the drive source 17 and rotates clockwise, the push-up pin 14.14' pushes the gate lever 12.12' upwardly through its overhangs 12a, 12a'. The gate member 7 is rotated and raised as shown in FIG. 4A. Further, when the shaft 11 is driven by the drive source 17 and rotates counterclockwise in the raised position of the gate member 7, the gate lever 12.12' mounted on the push-up pin 14.14' is moved. Rotate it downward to lower the gate member 7 as shown in FIG. At this time, the push-up pin 14
．． Reference numeral 14' is designed to allow the gate member 7 to escape at an angle greater than the angle at which it hits the original on the original stacker 3. Therefore,
The gate member 7 is configured to press down the original on the original stacker with its own weight. This gate member 7 causes the auxiliary lever 13, 13' to follow its vertical movement.

The front surface of the gate remains substantially perpendicular to the upper surface of the document stacker 3. That is, the gate member 7 is configured so that the front surface of the gate can be placed at a substantially right angle to the originals, regardless of the number of originals.

The gate cam gear 16 is provided with a tongue piece 19 that blocks the detection sensor 18 at its initial position. The sensor 18 determines the home position of the gate cam gear 16 when it is blocked by the tongue piece 19, and the drive source 17
can be rotated forward or reverse by the required angle. In this case, it is preferable to use a stepping motor that can be controlled by pulses as the drive source 17.

Reference numeral 20 denotes a push-out belt that pushes out the document at a fixed position to the paper feed position as described above; 21 a paper feed belt that sends out the document at the paper feed position from the bottom layer; and 22, which is in contact with the paper feed belt 21 and pushes out the document due to the weight of the document. This is a stop roller that prevents the machine from moving. The paper feed bell 1-21 is connected to the main motor 100 via an electromagnetic clutch 21a installed on its shaft and a one-way control means (not shown).
The upper belt surface is stretched between the drive shaft 23 and the driven shaft 23', which are connected to the drive shaft 23 and the driven shaft 23'.
It protrudes slightly from a.

A spring clutch 24 is installed on the shaft of the stop roller 22. As shown in FIGS. 5 and 6, the spring clutch 24 connects the protrusion 24b of the outer cylindrical body 24a to the clutch lever 25.
By pressing the spring 24c downward with the spring boss 2
4d and 24d' to enable the stop roller 22 to freely rotate (driven rotation), and then loosen the protrusion 2 of the outer cylinder 24a.
When the clutch lever 25 is inactive, the rotation of the stop roller 22 can be restricted. This clutch lever 25 is pivotally supported in a hanging manner at the tip of an arm 26 fixed to the shaft 11 in a direction opposite to the push-up pin 14 of the gate lever. Therefore, as shown in FIG.
When the clutch lever 25 is lowered and pushes the protrusion 24b of the spring clutch 24 clockwise, the gate member 7 is lowered by rotation in the opposite direction of the lever 11 as shown in FIG. 4B. and i! on manuscript 4. When the clutch lever 25 is placed, the clutch lever 25 separates upward from the protrusion 24b of the spring clutch 24, and the spring clutch 24 returns to its original position by the action of the built-in spring, thereby regulating the rotation of the stop roller 22.

The extrusion belt 20 is formed of a perforated belt stretched between so-called half-moon rollers 28 and 29 whose outer periphery is partially cut out. One of the half-moon rollers 28 receives driving force from a main motor 100 through a one-rotation spring clutch 30 as shown in FIG. 7, similar to the paper feed bell 1-21.

In the one-turn spring clutch 30, the protrusion 30b provided on the outer cylinder 3Qa hits the tip of the clutch lever 31, which is rotatable in a seesaw shape around a shaft fulcrum 31' as shown in FIG. When the rotation of the body 30a is restricted, the clutch spring 3Qc built therein is moved to the spring posts 30d, 30.
d' (see Figure 7) and the main motor 100
While the driving force is disconnected from the clutch lever 31, when the tip of the clutch lever 31 comes off the protrusion 30b of the outer cylinder 30a of the spring clutch 30 as shown in FIG. The drive from the main motor 100 is transmitted to the half-moon roller 28.

The rear end side of the clutch lever 31 is pressed against the cylindrical portion 16a of the gate cam gear 16 by the spring force of a tension spring 31a. A cam-shaped portion 16b is provided on a part of the circumference of this cylindrical portion 16a. Therefore, when the gate cam gear 16 is rotated by the operation of the drive source 17 of the gate member 7 and the cam-shaped portion 16b pushes down the rear end side of the clutch lever 31, the tip thereof is rotated by the outer cylindrical body 30a of the spring clutch 30.
It is designed so that it can be removed from the protrusion 30b. This rocking of the clutch lever 31 is caused by the gate cam gear 1 which is unrelated to the vertical drive of the gate member 7 when the gate member 7 is lowered.
This is done in a rotation area of 6. That is, as described above, the gate cam gear 16 has a home position (indicated by the symbol P in FIG. 8) determined by the initial position detection sensor 18 and the tongue piece 19, and the rotation area S in the counterclockwise direction from the point P is the gate position. 9 Clockwise rotation area S used for vertical movement of member 7
t is used for swinging the clutch lever 31. Incidentally, in the rotation region S2 of the gate cam gear 16 used for this swing, the push-up pin 14 escapes from the gate lever 12, and the sector gear 15 has teeth skipped by the small gear 16' at its tooth end. There is.

As mentioned above, the tip of the clutch lever 31 is connected to the outer cylindrical body 30a.
When the semicircular roller 28 comes off the protrusion 30b and the main motor starts rotating the half-moon roller 28, the gate cam gear 16 rotates counterclockwise due to the reverse rotation of the gate drive source 17, and the rear end side of the clutch lever 31 moves toward the cam-shaped portion. 16b, and is returned by the spring 31a to a position close to the outer cylindrical body 30a of the spring clutch 30 whose tip has passed by the protrusion 30b, and is rotated once by the half-moon roller 28. The protrusion 30b again hits the tip of the clutch lever 31, cutting off the driving force from the main motor 100.

The half-moon roller 28 always makes one complete rotation and then stops.

Further, as shown in FIG. 2, the extrusion bells 20 are provided in through-holes 32 arranged horizontally at a plurality of locations (three locations in the figure) on the document stacker 3. The periphery of this through hole 32 is a rib 3a on the document stacker 3.
It was as exciting as it was.

Further, the front side in the paper feeding direction is an inclined surface 32a to prevent the leading edge of the document from getting caught. When the notches of the half-moon rollers 28 and 29 are on top as shown in Figure 9, the upper belt surface is recessed through the through hole 32, and as shown in Figure B, the circumferential area of the half-moon rollers 28 and 29 is on top. When it happens, it stands out. In other words, the document 4 in the fixed position on the document stacker 3
is extruded by the friction of the extrusion belt 20 protruding from the through hole 32 with one rotation of the half-moon rollers 28 and 29. in this case,
Since the paper feed belt 21 is stationary due to the power from the main motor 100 being cut off by the action of the electromagnetic clutch 21a, the leading edge of the pushed out document is at the nip portion (handling point) between the paper feed belt 21 and the stop roller 22. This will cut into the situation.

Reference numeral 33 denotes a suction box provided to surround the extrusion belt 20 from the lower surface side of the document stacker 3. The suction box 33 uses the suction action of its suction fan 34 to pull one of the lowest documents into the through hole 32. It is configured so that the extrusion belt 20 can effectively exert its extrusion force by adsorbing it in the gap or belt hole between the extrusion belt 20 and the extrusion belt 20.

Reference numeral 35 indicates a forward path for guiding the original fed from the paper feeding mechanism 20 onto the platen glass 36 of the copying machine 1, which serves as the processing section 8; The 8-reversing path 37, which is a reversing path for reversing after exposure, is used to correct the inversion so that the even-numbered page side of a double-sided document faces the platen glass 36 surface, or to return the exposed document after such correction to the document stacker 3. This is so that the order of the pages can be reversed and corrected again, and it draws an upward loop from the same surface as the platen glass 36 and merges with the upper side of the forward path 35.

38 is a conveyance roller provided in the middle of the forward path 35;
9.40 is a conveyance roller provided in the middle of the reversing path 37. These conveyance rollers 38 and 39.40 are connected to the main motor 100 via a one-way control mechanism so that they can always rotate in the same feeding direction.

Reference numeral 41 denotes a conveyor belt for conveying the original in the forward and reverse directions on the upper surface of the platen glass 36. This conveyor belt 41 includes a first roller 42 on the sheet feeding side connected to the main motor 100 via a forward/reverse switching means 101;
It is stretched between it and the second roller 43 on the paper ejection side. A tension roller 44 is in pressure contact with the upper belt surface near the first roller 42, and the lower belt surface is brought into sliding contact with the platen glass 36 by a plurality of presser rollers 45.

The first roller 42 and the second roller 43 are connected to each other by a timing belt 46 as shown in FIG. In this case, the timing pulley 47 on the first roller 42 side is fixed to the first roller shaft 42a, and the timing pulley 48 on the second roller 43 side is attached to the second roller shaft 43a via a one-way clutch 49. Also, the first roller 4
The circumferential speed of the second roller 43 is configured to be slightly faster than the circumferential speed of the second roller 43 driven via the one-way clutch 49. Therefore, when the conveyor belt 41 rotates in the forward direction (arrow in FIG. 10), it runs by the driving force from the first roller 42, so that the lower belt surface is on the slack side. In this case, the second roller 43 is designed to slip between it and the one-way clutch 49, but if the conveyor belt 41 slips for some reason, for example, between it and the first roller 42, the driving force is not sufficiently transmitted. Due to the action of a one-way clutch 49, which is locked when the running speed of the belt decreases due to the rotation of the conveyor belt 41, the second roller 43 becomes the driving side and can drive the conveyor belt 41. Further, when rotating the conveyor belt 41 in the opposite direction (counterclockwise direction), the one-way clutch 49 is locked, and the second roller 4
3 is the drive side of the conveyor belt 41. That is, the conveyor belt 41 may run with the first roller 42 on the driving side, or may run with the second roller 43 on the driving side. This is particularly effective when performing synchronized exposure while feeding the original on the platen glass.

Reference numeral 50 denotes a document stopper provided at the paper discharge side end of the platen glass 36, and as shown in FIG. The solenoid 53 connected to the other end of the operating lever 51 and a spring 51' opposing the solenoid 51 allow the operating lever 51 to move in and out of the platen glass 36. This document stopper 50 is RD
While conveying the document over the platen glass 36 with the conveyance belt 41 at a synchronous exposure speed as in the F mode.

When creating an image on a drum by exposure in a fixed state, the optical system 54, which is provided directly below the platen glass 36 and has a selectable mode of fixed position and movement, is lowered from the platen glass, and when in ADF or SDF mode. The original is stopped at the exposure position on the platen glass 36 as shown in FIG.
When an image is created on the drum by exposing the drum 4 while moving it, it operates so as to protrude above the platen glass.

Reference numeral 55 indicates a paper discharge guide plate continuous to the exit side of the platen glass 36, and 56 indicates a paper discharge belt. The paper discharge belt 56 is supported by a shaft immediately behind the document stacker 3, and is connected to a drive roller 57 connected to the main motor 100 via a one-way control mechanism, and a drive roller 57 that is supported by a shaft so as to be able to move horizontally along the upper and lower surfaces of the document stacker 3. supported tension rollers 58, 59;
Auxiliary rollers 60 and 61 that are pivotally supported near the paper ejection guide plate 55 are stretched so as to wrap around the rear side of the document stacker 3 in a C-shape, and rotation of the drive roller 57 in a fixed direction causes the conveyor belt to 41, the document sent out can be conveyed in the paper ejection direction.

Tension rollers 58 and 59, which are the upper and lower ends of the paper ejection belt 56, are mounted on two parallel horizontal grooves 63 and 64 provided in the frame 62 on both sides of the main body 2 through roller members, as shown in FIG. The upper movable bodies 65 and the lower movable bodies 66 which are held so as to be slidable are respectively supported by shafts, and each of the movable bodies 65 and 66 is supported by sprockets, two each being pivotally supported on the front and rear sides of the skeletons 62 on both sides. 67.67'.

It is connected via attachments 70, 71 to the upper and lower sides of a chain 69 stretched between 68 and 68'. The lower front sprocket 67 is connected to a drive source 72 which is capable of forward and reverse rotation via an intermediate gear 72', as shown in FIG. Therefore, when the drive source 72 rotates the chain 69 in the forward and reverse directions, the upper belt portion 56a of the document stacker 3 moves forward or backward together with the tension roller 58 mounted on the upper moving body 65, and the lower belt portion Since the belt 56b moves rearward or forward together with the tension roller 59 which is mounted on the lower moving body 66, the belt tension can always be kept constant.

The movement mechanism of the paper ejection belt 56 is configured as a movement control mechanism of the trailing edge regulating plate 5 against which the trailing edge of a document is placed on the document stacker 3. 5 is attached to the upper moving body 65 so as to cover the front side of the tension roller 58. The lower edge thereof has a convex portion 5a that can fit into a concave portion 3b of a shallow concavo-convex portion parallel to the paper feeding direction provided on the rear upper surface of the document stacker 3.
is provided to prevent the pressed document from slipping under.

Reference numeral 73 denotes a home position sensor for the rear end regulating plate 5, and the sensor 73 determines the position where the blocking member 74 provided on the attachment 70 connected to the upper side of the chain 69 is detected as the home position of the rear end regulating plate 5. This home position is a position where the rear end of the maximum size (for example, A3 size) document can be brought into contact with the document.The document is moved forward from this point until the leading edge of the document 4 is detected by the stack sensor 27. The vertical size of the image can be read. Further, the stack sensor 2
7 detects the leading edge of the document, it outputs a lowering operation signal to the drive source 17 of the gate member 7, and also outputs a lowering operation signal to the drive source 17 of the gate member 7.
A stop signal is output to the drive source 72 of the chain 69 that moves the chain 6, and the drive source 72 causes the rear end regulating plate 5 to retreat from the front of the gate member by a distance corresponding to the document size read as described above. It is designed to output a signal.

Reference numerals 75 and 76 denote presser rollers that come into contact with the paper ejection belt 56 from the outside of the paper ejection guide plate 55 through through holes at positions corresponding to the auxiliary rollers 60 and 61.

Reference numeral 77 indicates a ceiling guide plate whose base end is hingedly connected to the upper rear end of the both side skeletons 62 of the main body 2, and 78 indicates a ceiling guide plate connected to the upper stage movable body 65 on which the tension roller 58 is mounted on the upper part of the upper belt part of the paper ejection belt 56. The sheet discharge log guide plate 79 facing each other with a slight gap is a presser roller that contacts the sheet discharge heald 56 through a through hole from the upper surface of the sheet discharge log guide plate 78. The ceiling guide plate 77 is provided with a plurality of ribs 80 facing in the paper ejection direction on its lower surface, which serves as a guide surface, so as to be able to impart directionality to the original.

A concave groove 81 provided on the upper edge of the upwardly inclined rear plate of the paper ejection log guide plate 78 is fitted into the rib 80 in an irregular manner, and the document that has advanced along the guide surface of the ceiling guide plate 77 is guided to the paper ejection log guide plate 78. and the paper discharge belt 56.

Reference numeral 82 denotes a switching claw provided in the middle of the temporary paper ejection guide 55 for switching between a circulation ejection path A in which processed originals are directed to the document stacker 3 and an external ejection path B that is directed to a paper ejection tray 83 outside the machine. , the switching pawl 82 is movable to open the external paper ejection path B when the trailing end regulating plate 5 returns to the home position, and opens the circulating paper ejecting route A when the trailing end regulating plate 5 is not at the home position. It is movable so that it can be opened. This switching action may be accomplished using a solenoid or other suitable mechanical mechanism.

Reference numeral 84 denotes a manual insertion plate whose proximal end is hingedly connected to the upper surface of the distal end of the ceiling guide plate 77, and the nucleus insertion plate 84 is usually attached to the first
As shown in the figure, it is folded so as to overlap the top surface of the ceiling guide plate 77, and can be unfolded to cover the document stacker 3 using the hinge joint as a fulcrum when feeding documents one by one in SDF mode. There is. At this time of unfolding, the tip of the single manual feed plate 84 reaches near the paper feed belt 21. Further, the two-manual feed plate 84 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 if the SDF actuator (not shown) is turned on when the nine manual feed plates 84 are unfolded.

In the above embodiment, the originals are stacked with the copy side facing up, aligned in page order from the top, and then placed by abutting the trailing edge against the trailing edge regulating plate 5 at the home position. Furthermore, after regulating the width direction with the width regulating plate 6.6', input the number of copies to be made, and at the same time turn on the copy button, the gate member 7
The drive source 17 that drives the gate member 7 is activated, and the gate member 7 is raised to a position where the stacked documents can sufficiently enter therebeneath.

Next, the drive source 72 of the trailing end regulating plate 5 is driven to push the document in the paper feeding direction and pass under the gate member 7. Then, when the leading edge of the document is detected by the stack sensor 27,
The drive source 17 operates to lower the gate member 7. At this time, the pin 14 installed on the shaft 11 that supports the gate lever 12 rotates to a position sufficiently away from the gate lever 12. Therefore, the gate member 7 can always press the upper surface of the document downward with its own weight regardless of the amount of documents. Further, the lower edge of the gate member 7 has a comb-teeth shape, and in combination with the upper surface rib 3a of the document stacker 3, the document is pressed against the paper feed belt 21 while forming a waveform in the document.

As mentioned above, when the push-up pin 14 is sufficiently far away from the gate lever 12, the gate cam gear 16 is connected to the drive source 1.
7, and the half-moon roller 28.2 is rotated by moving up and down the thalassotile lever 31 which is engaged with the protrusion 30b of the outer cylinder body 30a of the one-turn spring clutch 30 by the cam forming portion 16b.
9 is connected to the main motor 100 and the extrusion belt 20 is run, the original is transferred to the paper feed belt 21 and the stop roller 22.
It is pushed out towards the nip. At this time, the paper feed belt 2
1 remains unrotated by the action of the electromagnetic clutch 21a, the pushed-out original enters the nip between the paper feed belt 21 and the stop roller 22 in a wedge shape than the lower layer and is stopped.

Next, the electromagnetic clutch 21a is turned on, and the paper feed belt 21 rotates in the paper feeding direction. At this time, the stop roller 22 in contact with the paper feed belt 21 is maintained in a non-rotating state, so the bottom layer of the document is sent out by the paper feed belt 21, and the second and subsequent documents are transferred to the stop roller. 22 to prevent one double feed. When the paper feed belt 21 rotates, the extrusion belt 20 also starts in synchronization, and during one rotation it attracts and separates only the bottom document sheet from the stack of documents stacked above it, and in the paper feed direction. It acts to push it towards. In other words, the double feeding prevention function of the stop roller 22 is further improved.

As described above, the trailing edge regulating plate 5 stops when the leading edge of the document is detected by the stack sensor 27, 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 21 enters the forward path 35, is nipped by the conveyance roller 38 provided on the way, and is transferred between the platen glass 36 and the conveyance belt 4.
1 at a synchronous exposure speed. After the leading edge of the document crosses the synchronization sensor 85 provided in the middle of the forward path 35 (directly below the conveyance roller 38), the electromagnetic clutch 21a is turned off at a timing for each size.

The original transported by the transport roller 38 is transferred to the transport belt 41.
While conveying the image on the platen glass 36 at a synchronous exposure speed, the image is exposed using a fixed optical system 53 to create an image on the drum. The exposed document moves upward along the paper ejection guide plate 55 and is conveyed while being held between the paper ejection belt 56 and presser rollers 75 and 76 that are in pressure contact with the paper ejection belt 56.
Exit to the top side and move forward along the guide surface of the ceiling guide plate 77.

The paper is guided to the lower side of the paper ejection log guide plate 78, passes between the paper ejection belt 56 and the presser roller 79 that is in contact with the paper ejection belt 56, and is ejected toward the document stacker 3.

In this way, the originals discharged onto the original stacker 3 hit the gate member 7 and are aligned for the next feeding. In this case, since the lower edge of the gate member 7 has a comb-teeth shape, the document is prevented from slipping under the gate member.

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 are no originals under the gate member, and the stack sensor 27 detects that there are no originals under the gate, and finally When the paper ejection sensor 86 detects that the original is ejected.

The gate member 7 is raised again, the stacked document is sent out using the trailing end regulating plate 5, and the above operation is repeated until the set number of copies is completed, and this is detected by the paper ejection sensor 86. Then, the rear end regulating plate 5 returns to its home position and prepares for the secondary operation.

Note that the above operation is for a case where a single-sided original is made a single-sided copy, but it is possible to make a single-sided copy of a double-sided original by using the 1 reversing path 37, and if the copying machine is equipped with a duplex conveying means, it is possible to make a single-sided copy of a 9-sided original. Double-sided copying of originals and double-sided copying of double-sided originals are also possible.

Next, a case will be described in which the two-manual feed plate 84 is unfolded and a document is fed in the SDF mode.

In this case, the gate member 7 is placed in the raised position.

The thalasso-tire lever 25 acts on the protrusion 24b of the outer cylindrical body 24a of the spring clutch 24 installed on the shaft of the stop roller 22, and the spring of the spring clutch 24 is loosened, so that the stop roller 22 stops against the rotation of the paper feed belt 21. The driven rotation becomes possible. As a result, the manual feed document is nipped between the paper feed belt 21 and the stop roller 22 driven by the paper feed belt 21, and is smoothly sent out. The document thus sent out is guided onto the platen glass 36 through a forward path, and is conveyed to the exposure position on the platen glass 36 by a conveyor belt 41.

It hits the document stopper 50 that protrudes there and stops. The optical system 54 then moves and exposes.

Create an image on the drum. Exposure by moving the optical system 54 is repeated for one copy.

After the exposure process, the original is sent in the ejection direction by retracting the original stopper 50 and reactivating the conveyor belt 41, and is ejected from the external paper ejection port via the switching pawl 82 provided in the middle of the ejection guide plate 55. It is discharged into a tray 83.

〔Effect of the invention〕

As explained above, the present invention includes a paper feed port that separates documents stacked on a document stacker one by one starting from the lowest layer and feeds the documents onto the platen glass of a copying machine; A document conveying device comprising a circulation paper discharge port for returning processed documents to a document stacker, and an external paper discharge port via a switching pawl in the middle of a path toward the circulation paper discharge port, which has the above-mentioned separation mechanism. It features a common paper feed slot and manual paper feed slot, so when making multiple copies from multiple originals, place the original on the original stacker and feed the bottom original one by one to the platen. The document is transported onto the glass and placed back on top of the topmost document on the document stacker while performing synchronous exposure.

An automated function that repeats this operation as many times as necessary to sequentially create a stack of copies that correspond to the stack of originals, and a stacker for the same original that can significantly reduce reliability when automatically circulated, such as pasted or folded originals. The original can be fed in single sheets and conveyed onto the platen glass using a one-manual feeding method.

It has an added function to eject the original after positioning and exposure, and since the original feeding port is for both manual and automatic feeding, it has the effect of allowing the original to be oriented in the same direction.

[Brief explanation of the drawing]

1 to 13 show embodiments of this invention. Fig. 1 is a front sectional view of the main body of the document conveying device, Fig. 2 is a perspective view showing the document stacker and paper feeding mechanism, and Fig. 3 is an explanation showing the deformed state of the document pressed onto the document stacker by the gate member. Figures 4A and 4B are explanatory diagrams showing the operating state of the gate member, Figure 5 is a partially cutaway front view of the spring clutch provided on the stop roller shaft, Figure 6 is a side sectional view of the same, and Figure 7. is a perspective view of the one-rotation control mechanism of the half-moon roller, FIG. 8A
, B is an explanatory diagram showing the operating state of the rotating side '4B mechanism, Figures 9A and B are explanatory diagrams showing the operating state of the extrusion belt (half-moon roller), and Figure 10 is a perspective view of the drive system of the conveyor belt. 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, and FIG. 13 is a schematic diagram showing the drive mechanism of the paper ejection belt and rear end regulating plate. The perspective view and FIG. 14 are schematic cross-sectional views of a conventional example. 1-Copying machine 2...Document transport device body 3-Document stacker 4-Document 20-Extrusion belt 21-Paper feed belt 22-Stop roller Patent Applicant Konishiroku Photo Industry Co., Ltd. Figure 2 O Figure 31 ! ! Figure 4 (A) (B) r and 1 25 Figure 5 Figure 6 Figure 7 Wi Figure 8 (A) +4 (B) Figure 9 II Figure 12 Figure 13

Claims (4)

[Claims] (1) A paper feed port that separates the stacked originals on the original stacker one by one starting from the lowest layer and feeds the sheets onto the platen glass of the copier, and the processed originals on the platen glass. In a document conveying device equipped with a circulation paper discharge port for returning to the stacker, and an external paper discharge port via a switching claw in the middle of the path toward the circulation paper discharge port, a paper feed port having the separation mechanism and a manual paper feed are provided. A document conveying device characterized by having a common paper opening. (2) The paper feed port having the separation mechanism is connected to a paper feed belt;
The document conveying device according to claim 1, further comprising a stop roller in contact with the stop roller for preventing double feeding of documents. (3) The document conveying device according to claim 2, wherein the stop roller is in a state where it can be driven to rotate in the manual paper feeding mode. (4) The copying machine can select a copy mode in which the exposure optical system is moved and a copy mode in which the exposure optical system is fixed, and when the copy mode is in the copy mode in which the exposure optical system is moved, the original is moved to the original exposure position on the platen glass. 2. The document conveying device according to claim 1, further comprising a document stopper that protrudes to stop the document and is recessed under the platen glass when in a copy mode in which the exposure optical system is fixed.