JPH01267258A - Recirculating automatic original conveyor - Google Patents

Abstract

PURPOSE:To make the takeout of an original so easily in a way of putting fingers or the hand into a recess part even if a pre-process original mounting position and a takeout position for the processed original are the same by installing the recess part, where the hand or fingers are enterable, on an original stacker top face along the original paper feeding direction. CONSTITUTION:Plural strips of recess parts 3b are installed on the top of an original stacker 3 according to paper size along the original paper feeding direction at the sidelong position of a gate member 7. An original 4 set on the original stacker 3 is pushed by a rear end regulating plate in the state that the gate member 7 goes up, and conveyed by forwarding of an extruding belt 20 and a paper feeding belt 21, coming into contact with a nip part with a stop roller 22, and it is pressed with its own weight by a descent of the guide member 7, then it is fed to an exposure part piece by piece by frictional separation action of the stop roller 22. Then, the processed original 4 is put back onto the original stacker 3 again, and its tip is aligned and loaded on the guide member 7, and after copying is over, it is taken out after putting the hand H in the recess part 3b. Thus, original takeout is easily performable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic document feeder that circulates documents in a closed loop from a document stacker to a processing section and from the processing section to the document stacker.

[Conventional technology]

Generally, a circulating automatic document feeder (RDF) separates the originals stacked on a document stacker one by one starting from the lowest layer and sends them to a processing section, and the documents processed in the processing section are placed on the document stacker again. The paper is returned to the top of the original that is currently being fed. That is, each time the original is circulated, copies can be made one by one.

The originals that have been circulated in this way are stacked on top of the original that is being fed, with the leading edge and width direction properly aligned for the next feeding.

[Problem that the invention seeks to solve]

However, as mentioned above, in a circulating automatic document feeder, the unprocessed document placement position (setting position) and the processed document take-out position are the same, so there is no place to insert your finger when taking out the document, and it is difficult to take out the document. It was becoming difficult.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a circulation type automatic document conveying device that facilitates the removal of documents returned to a document stacker.

[Means for solving problems]

In order to achieve the above object, the present invention provides a circulation system in which documents are circulated in a closed loop from the document stacker through a processing section and back to the document stacker by providing a paper feed port at the front and a paper discharge port at the rear of the stacker. In the type automatic document feeder, a concave portion into which a finger can be inserted is provided on the upper surface of the document stamper along the document feeding 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, and 2 is a main body of a document conveying device (hereinafter referred to as main body). The main body 2 includes a document stacker 3 whose front part is curved. On the document stacker 3, there is a rear edge regulating plate 5 against which the rear end of the document 4 is abutted when setting the document 4, and a rear edge regulating plate 5 that controls the width direction of the document 4. Width regulating plate 6
, 6' are provided. 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. At the same time, the horizontal size of the document can be read by detecting its movable position with a sensor (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 advances due to the pushing action of the trailing edge regulating plate 5, and when the leading edge of the document reaches the detection position of the stack sensor 27, the stack sensor 2
This is a gate member that falls in response to a signal from 7 and is placed on the document 4 due to its own weight. This gate member 7 has the function of holding down the original document 4 to be fed by its own weight, and as described later, it hits the leading edge of the original document that has passed through the processing section 8 and returned onto the document stacker 3, so that it can be fed next time. 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 protrudingly 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 gate member 7 is provided with ribs 3a. A plurality of protrusions 7a are provided on the lower edge of the protrusion 7a 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 leading edge of the document from slipping under the gate.

Further, on the upper surface of the document stacker 3, as shown in FIG. 3B, there is provided a recess 3b having a depth such that the tip of a finger 1-1 can be inserted thereinto, as shown in FIG. 3B. This concave portion 3b is for making it easier to take out the original from the original stacker 3 on which the original before processing and the original after processing are placed.
It is provided in an elongated shape as shown in FIG. 3C so that it can be used in common regardless of the size of the document 4, such as B4, B5, A4, etc.

The recess 3b may be formed by selecting the height of the ribs 3a, 3a provided on the document stacker 3, so that the space between the ribs 3a, 3a may be used as a recess.

The gate member 7 is formed into a U-shape in plan, and both side surfaces 7b and 7c are brackets fixed to the front frame 9 of the main body 2 with screws or the like as shown in the second figure.10.10
The tips of the left and right gate levers 12.12' whose base ends are loosely attached to the shaft 11 rotatably mounted on the shaft 11 above the bracket 1-10. The end of the auxiliary lever 13 is pivoted, and the tip of the lever 13' is pivoted. 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 rX17 that can be reciprocated. There is. Therefore, when the shaft 11 rotates clockwise under the drive from the drive source 17, the push-up pin 14.14' moves the gate lever 12.12'.
is rotated upward via its overhanging portions 12a, 12a', and the gate member 7 is raised as shown in FIG. 4A.

In addition, in the raised position of the gate member 7, the shirt) 1
1 rotates counterclockwise under the drive from the drive source 17, the push-up pin 14.14' and the gate lever 12.12' mounted thereon are rotated downward, and the gate member 7 is rotated in the same direction. Lower it as shown in Figure B. At this time, the push-up pins 14, 14' escape more than the gate member 7 hits the original on the original stacker 3. Therefore,
The gate member 7 is configured to press down the original on the original stamper with its own weight. In order for this gate member 7 to follow the auxiliary lever 13, 13' when it moves up and down,
The front surface of the gate remains substantially perpendicular to the upper surface of the original stamper 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 heald 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 heald surface is the rib 3a of the document stacker 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 cylindrical body 24a to the clutch lever 25.
By pressing the spring 24C downward with the spring boss 2
4d and 24d' to enable free rotation (driven rotation) of the stop roller 22, and the protrusion 24b of the outer cylinder 24a.
When the thalassotile lever 25 is inactive, the rotation of the stop roller 22 can be regulated. 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, the gate member 7
As shown in FIG. 4A, when the shaft 11 rotates and rises through the pin 14, the thalassotile lever 25 lowers and pushes the protrusion 24b of the spring clutch 24 clockwise, while
As shown in FIG. 4B, when the gate member 7 descends as the shirt l-11 rotates in the opposite direction and falls onto the document 4, the clutch lever 25 upwardly separates from the protrusion 24b of the spring clutch 24, and the spring The clutch 24 is returned to its original position by the action of a built-in spring, and the rotation of the stop roller 22 is restricted.

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.

In the one-turn spring clutch 30, the protrusion 30b provided on the outer cylinder 30a hits the tip of the clutch lever 31, which is rotatable in a seesaw shape around a pivot point 31' as shown in FIG. 8A, and the outer cylinder is rotated. When the rotation of the body 30a is restricted, the clutch spring 30c built into the 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. , so that 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 thalasso-chiller 31, the tip of the cam-shaped portion 16b pushes down 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 falls.
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. Used for vertical movement of member 7, clockwise rotation area S
2 is used for swinging the Taranotile 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.

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 projection 30a of the spring clutch outer cylinder 30a comes off and is returned by the spring 31a to a position close to the outer cylinder 30a of the spring clutch 30 whose tip has passed by, 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. Therefore, the half-moon roller 28 always reliably rotates once and then stops.

Further, as shown in FIG. 2, the extrusion belt 20 is placed at multiple locations (three locations in the figure) on the document stacker 3.
They are provided in through holes 32 arranged side by side.

The periphery of this through hole 32 corresponds to the rib 3 on the document stacker 3.
It is raised to the same height as a and has an inclined surface 32a on the front side in the paper feeding direction to prevent the leading edge of the document from getting caught. The upper belt surface is covered with a half-moon roller 28 as shown in FIG.
When the notch of .degree. 29 is upward, it is recessed from the through hole 32, and when the circumferential area of the half-moon rollers 28, 29 is upward, as shown in FIG. 2B, it protrudes. In other words, the document 4 in the fixed position on the document scrubbing car 3 protrudes from the through hole 32 with one rotation of the half-moon rollers 28 and 29, and the Pi of the extruder 1-20! Extruded by rubbing. 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 located at the nip between the paper feed heald 21 and the stop roller 22 ( It will cut into the draft at the cutting point).

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 heald 20 can effectively exert its extrusion force by adsorbing it in the gap between it and the belt 20 or in the heald 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; This is a reversal path for reversing after exposure. The reversing path 37 is used to correct the inversion so that the even-numbered page side of a double-sided original faces the platen glass 36, and to re-invert and correct the order of the pages when returning the exposed original after such correction to the original slider 3. It is designed to draw an upward loop from the same surface as the platen glass 36 and merge with the upper side of the antegrade 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 conveying rollers 38, 39, and 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 the second opening on the paper ejection side and the roller 43. Thus, a tension roller 44 is pressed against 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 conveyance heald 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 transport heald 41. That is, the conveyance heald 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 done while feeding the original on the platen glass.
This is particularly effective when using 1n light.

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
As in the F mode, while the original is transported by the transport belt 41 over the platen glass 36 at a synchronous exposure speed, the optical system 54, which is provided directly below the platen glass 36 and can be fixed in a fixed position or moved, is fixed and exposed. When creating an image on the drum, the document is lowered from the platen glass 36 as in ADF or SDF mode.
When the optical system 54 is stopped at the upper exposure position and exposed while moving to create an image on the drum, it operates so as to protrude above the platen glass.

Reference numeral 55 denotes a temporary paper discharge guide continuous to the exit side of the platen glass 36, and 56 denotes a paper discharge belt. The paper ejection belt 56 is supported by a shaft immediately after the original stacker 3, and is movable horizontally along the upper and lower surfaces of the original stacker 3 and a drive roller 57 connected to the main motor 100 via a one-way control mechanism. Tension rollers 58, 59 are pivotally supported by
Then, the rear side of the document stacker 3 is moved to C by the auxiliary rollers 60 and 61 that are pivotally supported near the paper ejection guide plate 55.
It is stretched so as to be rolled up into a shape, and the document sent out from the conveyor belt 41 can be conveyed in the paper ejection direction by rotation of the driving roller 57 in a fixed direction.

Tension rollers 58 and 59, which are the upper and lower ends of the paper ejecting 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 moving bodies 65 and the lower moving bodies 66 which are slidably held together are supported by shafts, and each of the moving bodies 65 and 66 has two sprockets pivotally supported on the front and rear sides of the skeletons 62 on both sides. 67.67'.

It is connected to the upper and lower sides of a chain 69 stretched between 68 and 68' through attachment members 1-70 and 71.

The lower front sprocket 67 is connected to a drive R72 which is capable of forward and reverse rotation via an intermediate gear 72', as shown in Figure 13. Therefore, when the drive source 72 rotates the chain 69 in the forward and reverse directions, the upper belt portion 56a of the document stamper 3 moves forward or backward together with the tension roller 58 that is pivoted 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 the document is abutted when setting the document on the document stacker 3. The tension roller 5 is attached to the upper moving body 65.
It is attached to cover the front of 8. The lower edge is provided with a convex portion 5a that can fit into a concave portion 3b of a shallow concave and convex portion parallel to the paper feeding direction provided on the rear upper surface of the document stamper 3, so that the document to be pressed does not slip under the convex portion 5a. It consists of

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, the gate member 7 is driven a.
In addition to outputting a lowering operation signal to 17, the moving body 65.6
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.

75 and 76 are 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, and 77 are the upper rear ends of the both side frames 62 of the main body 2. A ceiling guide plate 78 has its proximal end hinged to the top, and 78 is a paper ejection log guide plate that faces the upper moving body 65 on which the tension roller 58 is pivoted, with a slight gap above the upper surface of the upper belt part of the paper ejection belt 56. , 79 connect the paper ejection belt 56 through the through hole from the upper surface of the paper ejection log guide plate 78.
This is the presser roller that is in contact with the The ceiling guide plate 7
7 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 groove 81 provided on the upper edge of the upwardly inclined rear plate fits in a rectangular shape, and the document advanced on the guide surface of the ceiling guide plate 77 can be reliably guided between the paper ejection log guide plate 78 and the paper ejection belt 56. That's what I do.

Reference numeral 82 denotes a switching claw provided in the middle of the paper ejection guide plate 55 for switching the processed original between a circulating paper ejection path A that leads to the original stamper 3 and an external paper ejection path B that leads to the 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 feed plate whose proximal end is hingedly connected to the top surface of the top end of the ceiling guide plate 77. Usually, the manual feed plate 84 is
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 original stamper 3 using the hinge joint as a fulcrum when feeding originals one by one in SDF mode. There is. At this time of unfolding, the tip of the manual feed plate 84 reaches near the paper feed belt 21. Further, the 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 to configure the SDF actuator (not shown) to be turned on when the manual feed plate 84 is unfolded.

In the embodiment described above, the originals are stacked and set with the copy side facing up, aligned in page order from the top, and the rear ends are abutted against the rear end regulating plate 5 at the home position. Furthermore, after regulating the width direction with the temporary width regulation 6.6', input the number of copies to be made, turn on the copy button, and at the same time, 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 force of the driving source 72 of the trailing end regulating plate 5 is moved by one range, and the document is pushed out in the paper feeding direction so that the bottom of the gate member 7 is closed. When the leading edge of the document is detected by the stack sensor 27, the drive source 17 is activated to lower the gate member 7. At this time, the shaft 11 supporting the gate lever 12
The pin 14 installed in the gate lever 12 rotates to a position where it can be measured sufficiently. 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 heald 21 while forming a waveform.

As described above, when the push-up pin 14 is sufficiently far away from the gate lever 12, the gate cam gear 16 is rotated by the rotary drive source 17, and the cam forming portion 16b rotates the protrusion of the outer cylindrical body 30a of the one-turn spring clutch 30. Half-moon roller 28.
29 is connected to the main motor 100 and the extrusion belt 20 is run, the document is transferred to the paper feed belt 21 and the stop roller 2.
It is pushed out towards the nip with 2. At this time, the paper feed belt 21 remains unrotated due to the action of the electromagnetic clutch 21a, so the pushed out document enters the model between the paper feed belt 21 and the stop roller 22 more than the lower layer. and stop.

Next, the electromagnetic clutch 21a is turned on, and the paper feed belt 21 rotates in the paper feeding direction. At this time, the paper feed belt 21
Since the stop roller 22 in contact with the stack is maintained in a non-rotating state, the bottom layer of the document is sent out by the paper feed belt 21, and the second and subsequent document bundles are held down by the stop roller 22 and the heavy transmission is prevented. When the paper feed belt 21 rotates, the extrusion belt 20 is also started in synchronization, and during one rotation, only the bottom document is separated from the stack of documents stacked above it, and the paper is fed. It acts to push out in the direction. 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 to the clutch F after a timing for each size.

The original transported by the transport roller 38 is transferred to the transport heald 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 on the guide surface of the ceiling guide plate 77,
The paper is guided to the lower side of the temporary paper ejection log guide 78, passes between the paper ejection heald 56 and the presser roller 79 in contact with it, 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 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. When the stack sensor 27 detects that there are no more documents under the gate, and the discharge sensor 86 detects that the last document has been ejected, the gate member 7 is raised again and the trailing edge regulating plate 5 stacks the documents. The above operation is repeated until the set number of copies is completed. However, the number of copies set is completed,
When this is detected by the paper discharge sensor 86, the trailing end regulating plate 5 returns to its home position and prepares for the next operation.

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

Further, during the above-mentioned operation, when the gate member 7 is lowered and placed on the original, it will always come into pressure contact with the original due to its own weight, regardless of the amount of the original. Therefore, the lowest layer of originals sandwiched between the gate member and the original stacker is sent out by rotating the extrusion belt once with the one-turn clutch and rotating the paper feed heald by turning on the electromagnetic clutch. After the sent original is exposed to the same pJ on the platen glass (exposure while moving the original), it is returned to the upper surface of the original on the original stacker, and the leading edge is aligned by hitting the gate member. In this case, since the document pressed by the gate member is deformed into a wave shape by the pressing force of the gate member, the ejected paper is reliably prevented from slipping into the lower surface of the gate.

Therefore, when taking out the original that has been returned to the original stacker 3 after completing the required number of cycles, insert the tip of your finger into the recess 3b provided on the original stacker 3 along the paper feeding direction. This will be done as soon as possible.

〔Effect of the invention〕

As explained above, the present invention provides a circulation type automatic document stacker in which a document stacker is provided with a paper feed port at the front and a paper discharge port at the rear, and circulates documents from the document stacker through a processing section and back to the document stacker in a closed loop. The feeding device is characterized in that a recess into which a finger can fit is provided on the top surface of the document stamper in alignment with the document feeding direction, so that the document placement position before processing (cent position) and the take-out position for processed documents can be easily adjusted. Even if they are the same, the excellent effect is that the document can be easily taken out by inserting a finger into the recess.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which 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. Explanatory diagram showing the deformed state of the pressed original, Figure B
4A is a side sectional view showing the recess into which a finger is inserted; FIG. 4C is a plan view showing the relationship between the recess and the document size; FIGS.
is an explanatory diagram showing the operating state of the gate member, and Figure 5 is a partially cutaway front view of the spring clutch installed on the stop roller shaft.
FIG. 6 is a side sectional view of the same, FIG. 7 is a perspective view showing one rotation control mechanism of the half-moon roller, FIGS. 8A and 8B are explanatory views of the operating state of the same rotation control mechanism, and FIG. 9A. B is an explanatory diagram showing the operating state of the extrusion belt (half-moon roller), FIG. 10 is a perspective view showing the drive system of the conveyance heald, and FIG.
12 is a perspective view showing the rear side of the document stacker, and FIG. 13M is a schematic perspective view showing the drive mechanism for the paper ejection belt and rear end regulating plate. 3.--Document stacker 3a--Rib 3b--Concavity 4--Document 5--Rear edge regulating plate 7-Gate member 10.10'-m-Bracket 11-Shaft 12.12'--Gate lever special Applicant Konica Co., Ltd. Figure 2j Figure 3 (A) Figure 3 (S) Figure 4 (A) (B) Figure 5 Figure 6 Figure 7 Figure 8 (B) Figure 9 Figure 10 Figure 11 Figure 12 Figure 13

Claims (1)

[Claims] In a circulation type automatic document feeder that has a paper feed port at the front of the document stacker and a paper ejection port at the rear thereof, and circulates documents from the document stacker through a processing section and back to the document stacker in a closed loop, there is no need to place your fingers or fingers on the top surface of the document stacker. What is claimed is: 1. A circulation-type automatic document feeder, characterized in that a recess into which a document is inserted is provided along the document feeding direction.