JPS63202556A - Original transporting device - Google Patents

Abstract

PURPOSE:To prevent the paper-discharge-disabled state independently of the size of an original by installing a paper discharge port to an original stacker in shiftable ways in the paper discharge direction and installing a supporting member for the original within a shift range. CONSTITUTION:A paper discharge belt 56 is axially supported directly behind an original stacker 3, and laid so as to wind the rear part side of the original stacker 3 into C-figure form by a driving roller 57, auxiliary rollers 60 and 61 installed at the position close to a paper discharge guide plate 55, and the edge part rollers 58 and 59 which can be shifted in the horizontal direction along the upper and undersurfaces of the original stacker 3. The advance and retreat of the edge part rollers 58 and 59 are interlocked, and when the roller 58 advances, the roller 49 retreats, and the tension of the belt 56 is always kept constant. Further, pressing rollers 79, 75, and 76 are installed onto the rollers 58, 60, and 61. The transfer mechanism of the paper discharge belt 56 is constituted as the shift control mechanism of a rear edge control plate 5 in the case when the original is set onto the stacker 3. Therefore, even if a paper discharge port shifts in accordance with the original, nipping is not generated in a transport passage.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention separates documents stacked on a document stacker one by one, automatically feeds them onto a platen glass of a copying machine, and performs exposure processing on the platen glass. The present invention relates to a document conveying device that allows subsequent documents to be returned to the document stacker for repeated processing.

[Background of the invention]

In general, a circulating document feeder (RDF) makes copies one by one in circulation, and circulates the document by the number of copies made. In such devices, separation performance at the paper feed section is extremely important. A ``bottom feed and top return'' method has been adopted as a paper feeding method with excellent separation performance. This separates and conveys the documents stacked on the document stacker one by one from the lowest layer to the processing section6. When returning the original after exposure processing to the original stacker, the operation of returning the original to the top surface of the original being fed is repeated. There are two types of bottom feeding: one uses a sacsilan to adsorb and separate one 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. It has the advantage of being low cost, compact, and easy to adjust and maintain. A typical document conveying device that achieves this is a document stacker 1 whose front side in the paper feeding direction is steeply inclined downward as shown in FIG. 14.
A paper feed port 141 is provided at the lower end of the copying machine 40, and a sheet of original sent from the paper feed port 141 is guided to the top surface of a platen glass 143 of the copying machine through a paper feed path 142, and the document is placed on the platen glass 143. The conveyor belt 144 is rotated forward to the exposure position, and the exposure optical system 1 is moved to the exposure position at that position.
45 is reciprocated to perform exposure processing, the processed original is reversely conveyed by reversing the conveyor belt 144, and is placed on the original stacker 140 through a paper ejection path 146 through a paper ejection port 147 provided above the paper feed port 141. The paper is ejected in the opposite direction to the paper feeding direction and returned to the top surface of the unprocessed originals on the original stacker 140. In this case, unprocessed originals and processed re-stacked originals are separated by a partition plate 14 provided in front of the paper feed port 141.
8, the partition plate 148 rotates once in the counterclockwise direction and rests on the top surface after the last sheet of unprocessed documents passes through the processing section and is restacked. They can be distinguished by placing them on a partition plate 148.

However, in the case of the above device, the document stacker 14
It is necessary to make the inclination angle of 0 steep, and the total height becomes very high.The edge alignment may be poor because the re-stacked originals are set in the paper feed section 141 using their own weight to fall. It may not fall off completely due to bends or curls, and may get caught in the middle.

There is a fear that the separation performance will be significantly degraded, the inclination angle of the document stacker 140 is steep, and there is a risk that the re-stacked documents may slip under the partition plate 148;
It is necessary to once expose the original at the exposure position of the platen glass and then transport it backwards, which causes various problems such as slow original exchange speed.

Therefore, the applicant has provided a trailing edge regulating plate to push the document set on the rear side of the document stacker equipped with a paper feed section at the front and feed it to the paper feed section, thereby allowing document feeding without steeply tilting the document stacker. In addition, if a paper ejection port is provided above the trailing edge regulating plate and can be moved integrally therewith, the document fed from the document stacker passes through the processing section and returns to the document stacker in a closed loop. We found that the problem could be solved. In this case, the trailing edge regulating plate and the paper ejection port provided above it push the original set on the document stacker to the paper feed section, and then the document sent out from the paper feed section is exposed and placed on the document stacker. Before the paper is ejected to
It is necessary to retract the paper to the old position or a specified position determined for each document size, and even if the paper ejection port moves its position according to the document size, etc., the paper is sent out from above the platen glass by the conveyor belt. It has been found that it is necessary to prevent the document from being nipped at all between the R feed belt and the paper ejection port, regardless of its size.

[Purpose of the invention]

In view of the above points, this invention allows the paper ejection port to be moved according to the document size, etc., and furthermore, depending on its position, the document is always nipped between the conveyor belt on the platen glass and the paper ejection port. It is an object of the present invention to provide a document conveying device which is configured as follows.

[Structure of the invention]

In order to achieve the above object, the present invention provides a document transport device including a document stacker having a paper feed section at the front and a paper discharge port on the rear side, in which the paper discharge port is provided to be movable in the paper discharge direction. A document support member is disposed within the movement range of the paper discharge port, and the structure is such that the paper cannot be discharged depending on the size of the document.

〔Example〕

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

In FIG. 1, 1 is the main body of the copying machine, and 2 is a document conveying device. The document conveying device 2 includes a document stacker 3 whose front part is curved, and a trailing edge regulating plate 5 is provided on the document stacker 3 for abutting the trailing edge of the document 4 when setting it.
and a width regulating plate 6.6 for regulating the width direction of the document 4.
' is provided. The width regulating plates 6, 6' are connected to racks 6b, 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 a sensor (9) not shown. Further, 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 bumps the leading edge of the document that has passed through the processing section 8 and returned onto the document stacker 3 for primary 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 stacker 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 FIG. This effectively prevents the tip of the gate from slipping under the gate.

The gate member 7 is formed in a U-shape in plan, and both side surfaces 7b and 7c are brackets 1 fixed to the front frame 9 of the document conveying device 2 with screws or the like, as shown in the second figure.
Shaft 11 rotatably mounted on the upper side of 0.10'
The left and right gate levers 12. have their proximal ends loosely attached.
It is pivotally supported by the distal end of the bracket 12' and the distal end of an auxiliary lever 13.13' whose proximal end is pivoted on the underside of the bracket 10.10'. The gate lever 12.12' is provided with projecting parts 12a, 12a' at the upper part of its inner edge side, and the push-up pin 14.14' implanted in the shaft 11 corresponds to the projecting parts 12a, 12a' on the lower surface thereof. It has become. This shaft 11 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 linked to an output gear 17' of a drive source 17 that can be reciprocated. ing. Therefore, when the shaft 11 is driven by the gate drive source 17 and rotates clockwise, the push-up pin 14.14' moves the gate lever 12.
12' is its overhanging portion 12a.

12a' to raise the gate member 7 as shown in FIG. 4A. In addition, when the shaft 11 is driven from the gate drive source 17 and rotates counterclockwise in the raised position of the gate member 7, the gate lever 12 resting thereon together with the push-up pins 14 and 14'
．． 12' is rotated downward, and the gate member 7 is lowered as shown in FIG. At this time, the push-up bins 14, 14' are designed to escape at an angle greater than the angle at which the gate member 7 hits the original on the original stacker 3. Therefore, the gate member 7
The document appears to be held down by its own weight on the document stacker. When the gate member 7 moves up and down, it follows the auxiliary levers 13 and 13', so that 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, as the drive source 17, it is preferable to use a stamping motor that can generate pulses.

Reference numeral 20 denotes a push-out belt that pushes out the original at the fixed position to the paper feeding position as described above, 21 a paper feeding belt that sends out the original at the paper feeding position from the bottom layer, and 22 which contacts the paper feeding belt 21 to carry out double feeding of originals. This is a stop roller that prevents this. The paper feed belt 21 is stretched between a drive shaft 23 connected to the main motor 100 via an electromagnetic clutch 21a installed on the shaft and a one-way control means (not shown), and a driven wheel 23'. The upper belt surface is the rib 3a of the original stuff car 3
It stands out a little more.

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 cylinder 24a to the thalassotile 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 of the shaft 11 in the opposite direction as shown in FIG. 4B. , when the document 4 is placed on the document 4, 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. I come to do it.

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. As shown in FIG. 7, this one half-moon roller 28 receives driving force from a main motor 100 through a one-turn spring clutch 30 in the same way as the paper feed belt 21.

The one-rotation spring clutch 30 has a protrusion 30b provided on the outer cylinder 30a, as shown in FIG. 8A (see FIG. 8A). When the rotation of the cylindrical body 30a is restricted, the clutch spring 30c built into the cylinder body 30a engages the spring bosses 30d and 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 S1 in the counterclockwise direction from the point P is the gate member. Rotation area S in the clockwise direction used for vertical movement of 7.
2 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 half-moon roller 28 comes off the protrusion 30b and the main motor starts rotating, 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 thalassotile lever 31 moves away from the cam shaped portion 16b. The protrusion of the spring clutch's outer cylinder body 30a is returned by the spring 31a to a position close to the outer cylinder body 30a of the spring clutch 30, which has come off and the tip of which the protrusion 30b has passed, and is rotated once by the half-moon roller 28. 30b hits the tip of the clutch lever 31 again, 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 belt 20 is provided in through holes 32 arranged side by side 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 results in wedge-shaped penetration into the area.

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

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 first 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 of the second roller 43 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 *transport 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 the exposure optical system 54, which is installed directly under the platen glass 36 and can be fixed in a fixed position or moved in a selected mode, is exposed in a fixed state to create an image on the drum, it is lowered from the platen glass, and the exposure optical system 54 is set in the ADF or SDF mode. When the document is stopped at the exposure position on the platen glass 36 and the optical system 54 is moved while exposing the document to create an image on the drum, 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 original stuff car 3, and is connected to a drive roller 57 connected to the main motor 100 via a one-way control mechanism, and a shaft so that it can move horizontally along the upper and lower surfaces of the original stuff car 3. supported upper and lower end rollers 58;
59 and a group of 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 stuff car 3 in a C-shape, and the driving roller 57 is rotated in a certain direction. The document sent out from the conveyor belt 41 can be conveyed in the paper ejection direction by the rotation of the conveyor belt 41 .

Upper and lower end rollers 58 of the paper ejection belt 56,
Reference numeral 59 denotes a frame 62 on both sides of the document conveying device 2 as shown in the twelfth figure.
The shafts are mounted between the upper moving bodies 65 and the lower moving bodies 66, which are slidably held via roller members in two parallel horizontal grooves 63 and 64, and the respective moving bodies 65 .66 is connected via attachments 70, 71 to the upper and lower sides of a chain 69 stretched between sprockets 67, 67', 68, and 68', which are pivotally supported, two each on the front and rear sides of the frame 62 on both sides. . and,
The front lower sprocket 67 is connected to a chain drive source 72 which can be rotated in forward and reverse directions via an intermediate gear 72', as shown in FIG. Therefore.

When the chain drive source 72 rotates the chain 69 in the forward and reverse directions, the belt portion 56a on the upper side of the document stacker 3 moves forward or backward together with the upper end roller 58 pivoted on the upper stage moving body 65, and the lower side Since the belt portion 56b moves rearward or forward together with the lower end roller 59 that is pivoted on the lower moving body 66, the belt tension can be maintained constant at all times.

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 the document is abutted when setting the document on the document stacker 3. The upper end roller 58 is attached to the upper moving body 65.
It is installed to cover the front of the As shown in FIG. 12, the lower edge is provided with 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 upper surface of the rear portion of the document stacker 3, so that the document to be pressed is lowered. It is configured so that it does not sneak into the system.

In FIG. 13, reference numeral 73 denotes a home position sensor of the rear end regulating plate 5, and the sensor 73 is a blocking member 7 provided on an attachment 70 connected to the upper side of the chain 69.
4 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, when the stack sensor 27 detects the leading edge of the document, it 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 movable bodies 65 and 66, and the drive source 72 moves the gate member by a distance corresponding to the document size read as described above from the trailing end regulating plate 5. It is designed to output a signal that causes the vehicle to retreat from the front.

Reference numerals 75 and 76 refer to presser rollers that contact 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; A ceiling guide plate with the base end hinged to the top end.

Reference numeral 78 denotes an upper moving body 6 that supports the upper end roller 58 on its axis.
5, a paper discharge port guide plate facing the upper surface of the upper belt portion of the paper discharge belt 56 with a slight gap therebetween;

Reference numeral 79 denotes a document pressing roller that contacts the paper ejection belt 56 through a through hole from the upper surface of the paper ejection port guide plate 78. The ceiling guide plate 77 is provided with a plurality of ribs 80 facing 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 recessed grooves 81 provided on the upper edge of the upwardly inclined rear plate of the opening guide plate 78 fit in a rectangular shape, and the document that has advanced along the guide surface of the ceiling guide plate 77 is guided between the paper ejection port guide plate 78 and the paper ejection belt 56. We will make sure to provide you with guidance during this time.

Reference numeral 82 denotes a switching claw provided in the middle of the paper ejection guide plate 55 for switching the processed document between a circulating paper ejection path A that leads to the document stacker 3 and an external paper ejection path B that moves the processed original 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, a mark indicating the size of the document to be fed is attached to the top surface of the nine manual feed plate 84 when it is unfolded, so that the document insertion position can be known. Furthermore, it is convenient that the SDF actuator (not shown) is turned on when the two-hand feed plate 84 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 the rear ends abutting against the rear edge regulating plate 5 at the home position. Furthermore, after regulating the width direction with the width regulating plates 6 and 6', inputting the number of copies to be made and turning on the copy button, the gate drive source 17 that drives the gate member 7 is activated, and the gate member 7 is stacked underneath. Raise it to a position where the original can enter sufficiently.

Next, the chain drive source 72 is started, and the intermediate gears 72',
The chain 69 rotates forward through the sprocket 67, and attachments 70 and 71 are attached to the upper and lower sides of the chain 69.
The upper end roller 58, which is pivoted on the upper stage moving body 65, which is connected via the upper stage moving body 65, moves forward.The lower end roller 59, which is pivoted on the lower stage moving body 66, moves rearward. . Therefore, the trailing edge regulating plate 5 attached to the upper moving body so as to cover the front of the upper end roller 58 moves forward while pushing the trailing edge of the document, and allows the leading edge of the document to pass under the gate member 7. However, when the leading edge of the document is detected by the stack sensor 27, the chain drive source 72 is stopped, the gate drive source 17 is reversed, and the gate member 7 is lowered.

At this time, the bottle 14 installed on the shaft 11 rotates to a position sufficiently away from the gate lever 12 and escapes, so that the gate member 7 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 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 deforming the document into a waveform.

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 I.
7, and the half-moon roller 28.2 is rotated by moving up and down the clutch lever 31, which is engaged with the protrusion 30b of the outer cylindrical body 30a of the one-turn spring clutch 30 by its 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 document enters the tree shape between the paper feed belt 21 and the stop roller 22 and stops there.

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 210 rotates, the extrusion belt 20 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 moves it in the paper feed direction. It acts like pushing it towards the target. In other words, the double feeding prevention function of the stop roller 22 is further improved.

Thereafter, the chain drive source 72 reverses, and the rear end regulating plate 5 retreats together with the upper end roller 58 moored to the chain 69 and moving rearward. In this case, the lower end roller 59 moves forward, and the tension of the paper ejection belt 56 does not change. Since the moving distance until the document is detected can be read in advance as the document size, the document moves backward leaving a distance from the front of the gate member 7 corresponding to the read size. Therefore, similarly to the trailing edge regulating plate 5, the paper ejection port, which is made up of a paper ejection port guide plate 78 provided on the upper moving body 65 and a document holding roller 79 in pressure contact with the paper ejection port, also has a different position depending on the document size. Become.

A sheet of the document thus sent out by the paper feed belt 21 enters the forward path 35 and passes through the transport roller 3 provided along the way.
8, the platen glass 36 and the conveyor belt 41
is transported at a synchronous exposure speed toward After the leading edge of the document crosses the synchronization sensor 85 provided in the middle of the forward path 35 (directly below the wt feed roller 38) and at a timing for each size, the electromagnetic clutch 21a is turned off.

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 discharge guide plate 55 and is discharged toward the document stacker 3 by the paper discharge roller 56. In this case, the document is supported by presser rollers 79, 75, and 76 that come into contact with the roller support portion of the paper ejection belt 56 through a through hole from the outer surface of the paper ejection port guide plate 78 and the paper ejection guide plate 55 that constitutes the paper ejection path. Therefore, even if the paper ejection port moves its position according to the document size, etc., the document fed out by the conveyor belt from above the platen glass will remain between the transport belt and the paper ejection port regardless of its size. There is no possibility that the paper will not be nipped at all, and the paper will not be unable to be ejected.

Further, the documents discharged onto the document stacker 3 are stacked again with their front and rear ends aligned by the gate member 7 and the trailing edge regulating plate 5, and their widths aligned by the width regulating plates 6, 6'. Therefore, the paper feeding performance during the primary paper feeding is improved.

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.

The above operation is performed when a one-sided original is copied on one side in the RDF mode. Therefore, the document stopper 50 provided at the paper ejection side end of the platen glass 36 of the copying machine 1 is recessed below the platen glass 36, and the exposure optical system 54 is in a fixed position mode. , this is AD
When the F mode is set, the exposure optical system 54 is in the movement mode, and the document stopper 50 provided at the end of the platen glass 36 on the paper discharge side protrudes above the surface thereof.

After the original is brought into contact with the original and stopped at that position (that is, the exposure position), and the exposure optical system 54 is moved to perform the copying operation for the set number of copies, the original is moved back to the original stopper 50, and
The sheet is sent in the discharge direction by reactivation of the conveyor belt 41, passes through a switching claw 82 provided in the middle of the paper discharge guide plate 55, and is discharged from the paper discharge port outside the machine to the paper discharge tray 83.

In addition, when copying a double-sided original on one side in the RDF mode, the original sent out from the original stacker 3 is transferred to the forward path 3.
When the paper is fed to the platen glass 36 through 5, the last page will be on top on the platen glass 36, so first,
- After stopping the document fed onto the 3rd surface of the variable platen glass,
■Reverse the conveyor belt 41 and transfer the original to the reversing path 37.
The original is turned over in a somersault shape, and exposed by the fixed optical system 54 on the platen glass 36 with the last page facing down. ■After exposure, the conveyor belt 4
1 is reversed, the original is passed through the reversing path 37 again, the page order is corrected, the other page is exposed on the platen glass 36 with the other page facing down, and the operation is returned to the original stacker 3, repeating the operations from ■ to ■. The single-sided copy of the double-sided original is completed.

Therefore, in order to make double-sided copies of a single-sided original, when the above-mentioned step (2) is activated, the original is returned to the original stacker 3 without being exposed to light, and only even-numbered pages are copied during the - cycle.

In the second cycle, odd-numbered pages are copied, and as a matter of course, the 1-reversal operation is not required during the copying of odd-numbered pages.

Of course, the paper feeding operation of the transfer paper on the copying machine 1 side is also performed in accordance with the above-mentioned document conveyance operation.

〔Effect of the invention〕

As explained above, the present invention provides a document transport device having a document stacker provided with a paper feed section at the front and a paper discharge port on the rear side, in which the paper discharge port is provided movably in the paper discharge direction, and the paper discharge port is provided movably in the paper discharge direction. The feature is that the document support member is placed within the movement range of the paper slot, so even if the paper ejection slot moves on the document stacker according to the document size, etc., the document will not be sent out from above the platen glass by the conveyor belt. Regardless of the size of the document, the document is always nipped between the conveyor belt and the paper ejection port, and the document has an excellent effect in that it is never impossible to eject the document.

[Brief explanation of the drawing]

1 to 13 show embodiments of this 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 an explanatory diagram 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 diagram showing the operating state of the gate member. A perspective view of a half-moon roller rotation control mechanism, FIGS. 8A and 8B are explanatory diagrams showing the operating state of the same rotation control mechanism, and FIGS. 9A and 9B are
B is an explanatory diagram showing the operating state of the extrusion belt (half-moon roller), FIG. 10 is a perspective view of the drive system of the conveyor belt, FIG. 11 is a perspective view of the operating mechanism of the document stopper, and FIG. 12 is a diagram of the document stacker. A perspective view showing the rear side, FIG. 13 is a schematic perspective view showing a drive mechanism for a paper ejection belt and a rear end regulating plate, and FIG. 14 is a schematic cross-sectional view of a conventional example. 3--Document stacker 4-Document 20-Extrusion belt 21...Paper feed belt 22--Stop roller 56-Paper discharge belt 57--Drive roller 58, 59...-Upper and lower end rollers 60 .61
- Auxiliary roller 65 - Upper stage moving body 66 - Lower stage moving body 67.67', 68.68' - Sprocket 69 -
Chain 70.71-Aku Notimento 72-Chain drive source patent Applicant Konishiroku Photo Industry Co., Ltd. Figure 2 ll3r! IJ Figure 4 (A) (B) Figure 5 Figure 6 Figure 7 Figure 8 (B) Figure 9 Figure 10 Figure 11. 12th t! ! Figure 13

Claims (3)

[Claims] (1) In a document transport device having a document stacker with a paper feed section at the front and a paper ejection port on the rear side, the paper ejection port is provided to be movable in the paper ejection direction, and the movement range of the paper ejection port is A document conveying device characterized in that a document supporting member is disposed therein. (2) A paper ejection belt is stretched by a plurality of roller groups on the rear side of the document stacker so as to wrap around the portion in a C-shape, and the upper end roller and the lower end of the paper ejection belt A patent claim in which a document rear end regulating plate is provided at a position covering the front side of the upper end roller and a paper discharge port guide plate is provided at a position covering the upper end roller. The document conveying device according to item 1. (3) The document supporting member is a presser roller that contacts the roller support portion of the paper ejection belt from the outer surface of the paper ejection guide plate that constitutes the paper ejection port guide plate and the paper ejection path. The document conveyance device described in Section 1.