JPS63202531A - Paper feeding device - Google Patents

Abstract

PURPOSE:To obtain a paper feeding device with good responsiveness while giving on hitting sound by using a stepping motor for the driving source of a clutch lever for engaging/disengaging a one-rotation spring clutch. CONSTITUTION:A stepping motor 17 transmits power to the shaft of a semicircular roller 28 while, on the other hand, it is immediately reversed after rotating by a defined number of pulses, rotating an gate cam gear 16 counterclockwise. As a result, the rear end side of a clutch lever 31 comes off of a cam shape part 16b while its front end is returned to a position in close vicinity to the outer cylinder body 30a of a spring clutch 30 of which its projection part 30b has passed, by means of a spring 31a. And, when the shaft of the semicircular roller 28 made one rotation, the projection 30b of the outer cylinder body 30a of the spring clutch again hits against the front end of the clutch lever 31, cutting off a driving force from a main motor. Accordingly, even if the rotating speed of the shaft of the semicircular roller 28 is high causing the time required for one rotation of the outer cylinder body 30 to be extremely short, the release and the stopping action of the clutch lever 31 can be rapidly carried out by regulating the rotating speed of the stepping motor 17.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention has nine documents stacked on a document stacker, for example, which are separated and conveyed one by one from the lowest layer to a processing section at a high speed, and after exposure processing. The present invention relates to a paper feeding device suitable for use in a circulation-type document conveying device that repeats the operation of returning the document to the top layer of the document being fed when returning the document to the document stamper.

[Background of the invention]

Generally, the paper feed device used in this type of document conveyance device is the 14th paper feed device.
As shown in the figure, the document stacker 140 is tilted steeply so that the front side in the paper feeding direction faces downward.

Utilizing the slope, the document 14 is placed between the nip between the paper feed belt 141 and the stop roller 142 installed at the lower end of the belt.
The tip of the paper feed belt 141 is rotated and the stop roller 142 acts to prevent double feeding, so that the originals can be frictionally separated one by one starting from the lowest one. In this case, it is necessary to increase the angle of the original stamper 140, and the overall height becomes very high.
Since the document is allowed to fall under its own weight, if the document is folded or curled, it may not fall completely, and as shown by reference numeral 143a, there is a risk that the document will be caught in the middle, resulting in a decrease in the two-separation performance.

In order to solve this problem, the present applicant made the document stacker 150 horizontal or tilted forward upward, and the document 151 set thereon was pushed by an appropriate means and placed on the extrusion belt 152.

A paper feeding device was developed in which the leading edge of a document is forced into the nip between a paper feeding belt 156 and a stop roller 157 in a pattern using a cough pushing belt 152.

The extrusion belt 152 of this paper feeding device is connected to the document stacker 15.
Half-moon roller 15 installed oppositely below the through hole 153 provided at 0
4.155, and is designed to move in and out of the through hole 153 with one rotation of the half-moon roller, starts in synchronization with the rotation of the paper feed belt 156, and stops correctly after one rotation. It looks like this. However, this extrusion belt 1
The one-rotation control mechanism 52 was constructed as shown in FIG. In the figure, 160 is a shaft of a half-moon roller on which an extrusion belt 152 is stretched, and the shaft 160 is a shaft of a half-moon roller with a one-turn spring clamp 161.
It is connected to the main motor via a timing belt 162. As shown in FIG.
65 is released, the built-in spring is tightened and the drive from the main motor is transmitted to the shaft 160 of the half-moon roller, and as shown in FIG. When regulated, a built-in spring loosens and disconnects the driving force from the main motor.

However, the clutch lever 165 of the one-rotation control mechanism shown in FIG. 16 swings in the release direction by energizing the solenoid 166 and pulling its plunger 166' against the spring 167, turning the solenoid 166 off. Since the plunger 166' is pushed out by the spring force of the spring 167 to swing in the locking direction, when the rotation speed of the shaft 160 is high and the time for one rotation of the outer cylinder body 163 is shortened, If the clutch lever 165 is not released and locked quickly in accordance with this, the shaft 160 cannot be correctly stopped in one rotation, and there is a risk that the shaft 160 will rotate two or more rotations. However, in order to make the thalassotile lever 165 swing faster, the suction force of the solenoid 166 is strengthened.
In addition, increasing the spring force of the spring 167 not only required a very large solenoid, but also increased the collision noise of the solenoid plunger during suction and release.

This caused the problem of becoming a large noise source.

[Purpose of the invention]

This invention is to solve the = L problem.

The purpose of this invention is to provide a paper feeding device that rapidly and stably swings the clutch lever that connects and disconnects the one-turn spring clutch that controls one rotation of the extrusion belt, and that does not produce the collision noise that occurs when using a solenoid. .

[Structure of the invention]

In order to achieve the above object, the present invention uses a stamping motor as a drive source for a clutch lever that connects and disconnects a one-turn spring clutch, and is configured to improve responsiveness.

〔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, 2 is a document conveying device main body (
The main body 2 (hereinafter referred to as the main body) includes a document stacker 3 whose front part is raised upward, and on the document stacker 3 there is a trailing edge regulating plate 5 against which the rear end of the document 4 is abutted when placing the document 4 thereon. 40 Width regulation plate 6 for regulating width direction
．． 6' is provided. The width regulating plates 6 and 6' are connected to racks 6b and 6b' which can alternately slide horizontally across the binion gear 6a on the lower surface of the original stamper 3, and are movable symmetrically around the center. 1. 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 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 stamper 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. Therefore, 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 7h are provided on the edge so as to correspond to the gaps between the ribs 3a, forming a so-called comb-teeth shape 6. In other words, the protrusions 7a arrange the original on the document stacker 3 in a comb-teeth shape with the ribs 3a. By deforming it into a waveform as shown in the third figure, the document 4 being fed is given stiffness, while the leading edge of the returning document is effectively prevented 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 attached to the bracket 1-10.1 fixed to the front frame 9 of the main body 2 with screws or the like, as shown in the second figure.
Left and right gate levers 12.12' have their proximal ends loosely attached to shafts 11 rotatably mounted above 0'.
and the tip of an auxiliary lever 13.13' whose base 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 connected to the output gear 1 of a drive source 17 that can be reciprocated.
It is connected to 7'. 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, in the raised position of the gate member 7, the shirt t-1
1 rotates counterclockwise under the drive from the drive source 17, the gate lever 12.12' mounted on the push-up pin 14.14' is 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 stamper 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 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 shut off by the tongue piece 9, and the drive source 17
A stevening motor that can be pulse controlled is used as the drive source 17 for forward and reverse rotation by a required angle.

Reference numeral 20 is the extrusion belt that pushes out the original at the fixed position to the paper feed position, 21 is the paper feed belt that sends out the original at the paper feed position from the bottom layer, and 22 is the pusher belt that is in contact with the paper feed belt 21 to push the original to the paper feed position. This is a stop roller that prevents double feeding.The paper feed belt 21 has 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. ', and its Φ upper belt surface is connected to the rib 3a of the document stamper 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 clutch lever 25 is inactive, the rotation of the stroke roller 220 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 E 1 in a direction opposite to the push-up pin 14 of the gate lever. Therefore, the gate member 7
as shown in FIG.

While 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 clutch lever 25 is lowered onto the original 4, the clutch lever 25 upwardly separates 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. It becomes like this.

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 body 30a 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 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. 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 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 Sl in the counterclockwise direction from the point P is the gate position. A rotation area S2 in the clockwise direction used for vertical movement of the member 7 is used for swinging the clutch lever 31.

That is, in the rotation region S2 of the gate cam gear 16, when the stepping motor 17 rotates clockwise from the point P by a certain number of pulses, the stepping motor 17 rotates in the opposite direction by the same number of pulses.

Incidentally, in the rotation region St of the gate cam gear 16 used for swinging the clutch lever 31, the push-up pin 14
is away from the gate lever 12, and the sector gear 15 is in a tooth-skipping state with the pinion gear 16' at its tooth end.

As mentioned above, the tip of the thalassotile lever 31 is connected to the outer cylinder 30a.
When the half-moon 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 stepping motor 17, and the rear end side of the clutch lever 31 engages with the cam shaped part. 16b, and is returned by the spring 31a to a position close to the outer cylinder body 30a of the spring clutch 30 whose tip has been passed by the protrusion 30b, so that the outer cylinder body of the spring clutch is rotated once by the half-moon roller 28. The protrusion 30b of the clutch lever 31 again hits the tip of the clutch lever 31 and disconnects the driving force from the main motor 100, so that the half-moon roller 28 always makes one complete rotation and 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 stamper 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 2
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 placed in the nip (separation area) between the paper feed belt 21 and the stop roller 22. (point) in a wedge-like manner.

Reference numeral 33 denotes a suction box provided to surround the extrusion belt 20 from the lower surface side of the document stamper 3, and the suction box 33 pushes out 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 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 to enable the pages to be reversed and corrected again, and is designed to draw an upward loop from the same surface as the platen glass 36 and merge 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 in one direction? They are linked via the I 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 the first O diagram. In this case, the timing pulley 47 on the first roller 42 side is fixed to the first roller shaft 42a, and the timing boot IJ48 of the second roller 43 is attached to the second roller shaft 43a via a one-way clutch 49. Further, the circumferential speed of the first roller 42 is configured to be slightly faster than the circumferential speed of the second roller 43 driven via the one-way clutch 49. Therefore, the conveyor belt 41 moves in the forward direction (10th
When rotating in the direction shown by the arrow in the figure, the belt is driven by the driving force from the first roller 42, and the lower belt surface is on the slack side. In this case, the second roller 43 is connected to the one-way clutch 49
However, if for some reason, for example, the conveyor belt 41 slips between the first roller 42 and
One-way clutch 49 that locks when the running speed of the belt decreases because the driving force is not sufficiently transmitted.
Due to this action, the second roller 43 becomes the driving side and can drive the conveyor belt 41. When the conveyor belt 41 is rotated in the opposite direction (counterclockwise), the one-way clutch 49 is locked and the second roller 43 becomes the driving 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 synchronous exposure is performed without feeding the original over 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 mode selectable between fixed position and movement, is lowered from the platen glass, and when in the ADF-IPSDF 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 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 that it can 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 The original document fed out from the paper 41 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 moving bodies 65 and the lower moving bodies 66 which are held in a slidable manner are respectively supported by shafts, and each moving body 65, 66 has two sprockets 1 which are 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 discharge belt 56 is a movement mechanism 11111 of the trailing edge regulating plate 5 against which the trailing edge of the document hits when placing the document on the document stacker 3! ! The rear end regulating plate 5 is attached to the upper moving body 65 so as to cover the front side of the tension roller 58. A convex portion 5a is provided on the lower edge of the document stacker 3 so that the document to be pressed does not slip under the convex portion 5a that can fit into the concave portion 3b of the shallow concave and convex portion parallel to the paper feeding direction provided on the rear upper surface of the document stacker 3. 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, 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 1172 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 that causes

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 Fi 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 press roller that contacts the sheet discharge belt 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 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 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 original stamper 3 using the hinge joint as a fulcrum when feeding originals one by one in SDF mode. There is. When unfolded, the tip of the two-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 to configure the SDF actuator (not shown) to be turned on when the two-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 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 driving source 72 of the trailing edge regulating plate 5 is driven, and the document is pushed out in the paper feeding direction and passed under the gate member 7, and 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 bottle 14 installed on the shaft 11 supporting the gate lever 12 rotates to a position sufficiently away from the gate lever 12. Therefore, regardless of the amount of documents, the gate member 7 can always press the top surface of the document downward with its own weight. Further, the lower edge of the gate member 7 has a comb-teeth shape, and in combination with the upper surface of the document stacker 3 and the ribs 3a, presses the document against the paper feed belt 21 while making the document waveform.

Next, the extrusion belt 20, which had been submerged in the through hole of the document stacker 3, is activated and runs in the paper feeding direction while protruding above the document stacker 3, thereby moving the document between the nip between the paper feed belt 21 and the stop roller 22. At this time, the paper feed belt 21 is not rotated by the action of the electromagnetic clutch 21a, so the pushed out document enters the nip in a wedge shape with the lower document first, and then stops. do.

Next, the electromagnetic clutch 21a is turned on, and the paper feed belt 21 rotates in the paper feeding direction to separate and convey the documents one by one starting from the lowest layer. When the paper feed belt 21 rotates, the extrusion belt 20 is also started in synchronization, so that the bottom document is separated from the stack of documents stacked above it and pushed out in the paper feed direction. act.

Shi7! 1, the trailing edge regulating plate 5 retreats from the gate member 7 to approximately the size of the document.

The sheet of original sent out by the paper feed belt 21 then enters the forward path 35, and a conveyance roller 38 provided along the way
The platen glass 36 and the conveyor belt 41 are nipped at
is transported at a synchronous exposure speed toward After the leading edge of the document crosses the synchronization sensor 85 installed in the middle of the forward path 35 (directly below the Il feed roller 38) and after the timing for each size (large size is at the end length (large size is at the stop of the trailing edge regulating plate) (determined by detecting the position), electromagnetic clutch 2
Turn 1a OFF.

The original transported by the transport roller 38 is transferred to the transport belt 41.
The drum is conveyed over the platen glass 36 at a synchronous exposure speed and then exposed by a fixed optical system 53 to form 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 repeated by changing the feeding timing and the same KIl conveyance speed determined for each copy size and copy magnification until there is no original under the gate member, and the stack sensor 27 detects that there is no original under the gate, When the ejection of the last document is detected by the ejection sensor 86.

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 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 2-reversing path 37, and if the copying machine is equipped with a duplex conveying means, it is possible to make a 2-sided copy of a 2-sided original. Double-sided copying of originals and double-sided copying of double-sided originals are also possible. In addition, when the manual feed plate 84 is unfolded and a document is fed in the SDF mode, the gate member 7
When it is placed in the raised position, the clutch 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. Paper feed belt 2
Rotation can be driven by one rotation. 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.

Next, the action of the one-turn spring clutch 30 that connects and connects the main motor 100 and the half-moon roller 28 will be explained.

When the gate member 7 is placed on the document, the gate cam gear 16 is located at a home position P determined by the initial position detection sensor 18 and the tongue piece 19. The stamping motor that is the driving source for the gate cam gear 16 is designed so that when the gate cam gear 16 rotates clockwise from the point P by a certain number of pulses, it rotates in the reverse direction by the same number of pulses. is the gate cam gear 16 for a certain number of pulses in response to a command from the control unit.
When rotated in the clockwise direction, the cam-shaped portion 16b provided on the cylindrical portion 16a of the gate cam gear 16 pushes down the rear end side of the clutch lever 31 and rotates the tip of the clutch lever 31 in the outer cylindrical body of the spring clutch 30. 30a from the protrusion 30b, thereby transferring the power from the main motor to the half-moon roller 28.
On the other hand, this stevening motor 17 rotates a predetermined number of pulses and then immediately reverses, rotating the gate cam gear 16 in a counterclockwise direction.
The rear end side is removed from the cam-shaped portion 16b, and its tip is returned by the spring 31a to a position close to the outer cylindrical body 30a of the spring clutch 30, which the protrusion 30b has passed, and the shaft of the half-moon roller 28 rotates once. At this time, the protrusion 30b of the outer cylinder 30a of the spring clutch again hits the tip of the clutch lever 31, and the driving force from the main motor 100 is disconnected. Therefore, even if the rotation speed of the shaft of the half-moon roller 28 is high and the time for one rotation of the outer cylinder 30 is extremely short,
It is possible to rapidly release and lock the clutch lever 31 by adjusting the rotational speed of the stepping motor 7, so that there is no delay and the shaft of the half-moon roller 28 can be correctly stopped in one rotation. There is no risk of the shaft rotating more than two revolutions, and the swinging of the thalassotile lever 31 by the cam does not generate any noise such as a collision sound.

It goes without saying that the present invention is applicable not only to ADFs but also to automatic duplex intermediate trays and other recording paper feeding devices.

〔Effect of the invention〕

As explained above, this invention is characterized in that a stepping motor is used as the drive source for the clutch lever that connects and disconnects the one-turn spring clutch.

■When the clutch lever is activated, there is no collision noise like a solenoid plunger.■Since the rotational speed of the stepping motor becomes the rocking speed of the clutch lever, the response frequency is faster and more stable than the solenoid method. ■Even if the response frequency is increased, the size of the stepping motor does not increase significantly, making the device more compact. - By using a stepping motor, there are various excellent effects such as eliminating the problem of temperature rise due to increased suction time as with solenoids.

[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 of 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. A perspective view showing the one-rotation control mechanism of the half-moon roller, FIG. 8A
, B is an explanatory diagram showing the operating state of the same rotation control mechanism, FIGS. 9A and B are explanatory diagrams showing the operating state of the extrusion belt (half-moon roller), and FIG. 10 is a perspective view showing the drive system of the conveyor belt. FIG. 11 is a perspective view showing the operating mechanism of the document stopper;
Figure 12 is a perspective view showing the rear side of the document stacker;
3 is a schematic perspective view showing the drive mechanism of the paper ejection belt and the trailing edge regulating plate, FIG. 14 is a diagram showing a conventional device, FIG. 15 is a diagram showing a comparative example of the conventional device, and FIG. 16A , B is a perspective view showing a conventional example of a one-rotation control mechanism. 3-Document stamper 4-Document 5-Rear end regulating plate 7-Gate member 11-Rotating shaft 12.12'-m--Gate lever 13.13'--Auxiliary lever 14.14'-m-Pushing up Pin 15 - Sector gear 16 - Gate cam gear 17 - Gate drive source 18 - Gate cam gear initial position detection sensor 19 -
- Tongue 20 - Push-out belt 21 - Paper feed belt 22 - Stop roller 30 - M- Rotating spring clutch 30a - Outer cylinder body 30b - Protrusion 31 - Clutch lever Patent Applicant Konishiroku Photo Industry Co., Ltd. 112 Figure 1131!1 Figure 4 (A) (B) Figure 5 Figure 6 ■ Figure 7 Figure 8 (B) Figure 9 Figure 10 Figure 11 Figure II 12 Figure 13 Figure 14

Claims (3)

[Claims] (1) A paper feeding device characterized in that a stepping motor is used to operate a clutch lever that connects and disconnects a one-turn spring clutch. (2) The paper feeding device according to claim 1, wherein the stepping motor is connected to rotate a cylindrical member having a cam forming portion for swinging a clutch lever in forward and reverse directions. (3) When the stepping motor rotates in a certain direction by a certain number of pulses from a home position determined by a tongue piece provided on a cylindrical member and its initial position detection sensor,
3. A paper feeding device according to claim 1 or 2, wherein the paper feeding device is configured to reverse by the same number of pulses.