JPH07117777B2 - Document feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention enables to feed originals stacked on an original stacker one by one to a platen glass and return them to the original stacker again after exposure processing so that they can be repeatedly fed. This document is related to the original document feeder. BACKGROUND OF THE INVENTION Generally, in a document feeder, documents stacked on a document stacker are separated one by one and fed onto a platen glass of a copying machine, and the originals after the exposure process on the platen glass are taken out of the machine. (ADF) and the originals stacked on the original stacker are separated one by one and fed onto the platen glass of the copying machine, and the originals after the exposure processing are re-produced on the platen glass. There is one that can be returned to the stacker so that it can be fed repeatedly (RDF). Separation performance at the paper feed section is extremely important in such document feeders. The “bottom feed” method is one of the methods that have been conventionally adopted as this method with excellent separation performance. There are two methods, one is to use suction to separate the originals one by one, and the other is to separate the originals one by one. The latter is lower cost and more compact than the former. There is an advantage that maintenance is easy. FIG. 16 shows a conventional document feeder equipped with the above-mentioned friction separation type sheet feeder. In the figure, 160 is a document stacker, which is placed in front of the document stacker 160. First paper feed unit 161 that separates documents by friction
In the path communicating from the first paper feed unit 161 to the processing unit 162
The third paper feed section 164 is provided in 3. The first sheet feeding unit 161 includes a sheet feeding belt 161a connected to a driving source (not shown) via an electromagnetic clutch MC1 and a separation roller 161b that is in non-rotational sliding contact with the upper surface of the sheet feeding belt 161a. By rotating the paper feeding belt 161a in the paper feeding direction while the front end of the original document that has been bitten into the mouth is blocked by the separation roller 161b, one original document in the lowermost layer that is in direct contact with it is rubbed by friction. It can be sent. In this case, the document feeding by the feeding belt 161a is stopped before the trailing edge of the document comes out of the pressure contact a with the separating roller 161b, and the subsequent feeding is handled by the second feeding unit 164. That is, if the trailing edge of the original comes out of the pressure contact point a between the paper feed belt 161a and the separation roller 161b, the next original will be continuously sent out. Therefore, the feeding of the second paper feeding unit 164 is performed by the paper feeding belt 161.
This is performed while sliding the pressure contact point a between the a and the separation roller 161b on the trailing edge side of the document. However, the stop of the paper feed belt 161a is normally performed by the front end of the original kicking the original synchronizing sensor 165 provided in front of the second paper feeding unit 164 to turn off the electromagnetic clutch MC1. For a large document and a small document, the length of the trailing edge of the document remaining behind the pressure contact a between the paper feed belt 161a and the separation roller 161b is different. For example, if the original length of the B5 size document length of l _1, A3 size and l _2, A3 size original is for longer by l ₂ -l _1, lingering behind the correspondingly only the pressure point a. Therefore, when the document is fed by the second paper feed unit 163 after the feeding belt 161a is stopped, the length of the document having a longer length is larger than the length of sliding the pressure contact a, that is, the friction resistance is large, and the length of the document is small. As a result of the delay in reaching the exposure point b of the processing unit 162 as compared with the original, the result is that the timing of synchronous exposure varies depending on the original length. [Object of the Invention] In view of the above points, an object of the present invention is to provide an original conveying apparatus in which the synchronous exposure timing is constant for originals of any size. [Configuration of the Invention] An object of the present invention is to have a sheet feeding unit having a drive source and a separation roller that is in sliding contact with the sheet feeding unit in a non-rotating state, and frictionally separates documents on a document stacker one by one. In a document feeding apparatus including one sheet feeding section and a second sheet feeding section in a path communicating from the first sheet feeding section to the platen glass, a document length detecting means for detecting a document length on the document stacker is provided. And a control means for changing the operating time of the first sheet feeding portion according to the length of the document detected by the means. The sheet feeding means includes sheet feeding means such as a sheet feeding belt having a driving source and a sheet feeding roller.

〔Example〕

Next, the present invention will be described based on embodiments with reference to the accompanying drawings. In FIG. 1, 1 is the main body of the copying machine, and 2 is the document feeder. The document feeder 2 is provided with a document stacker 3 whose front portion is in a front rising shape, and a trailing edge regulating plate 5 for abutting the trailing edge of the document 4 on the document stacker 3 when setting the document 4.
And lateral width regulating plates 6 and 6 ′ for regulating the width direction of the original 4.
Is provided. 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 (fixed position) of the means (stack sensor) 27 for detecting the vicinity of the paper feed port. The amount of movement of the trailing edge regulating plate 5 varies depending on the length of the document, and the length of the document can be known by detecting the amount of movement by the movement amount detection sensor 501 as shown in FIG. Further, the lateral width restricting plates 6 and 6 ′ are respectively connected to racks 6b and 6b ′ which can be slid sideways on both sides of the pinion gear 6a on the lower surface of the original stacker 3, and are symmetrical about the center of the original according to the lateral width of the original. It is movable to. Since the lateral width regulating plates 6 and 6'are manually adjusted to the lateral width of the original document, the lateral size of the original document can be known by detecting its position by the position detection sensor 601 as shown in FIG. Reference numeral 7 denotes a gate member. The gate member 7 is in a 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 27 It is lowered by the operation of the gate drive source 17 which is driven by the signal from and is placed on the original 4 by its own weight or a spring. The gate member 7 has a function of pressing the original 4 to be fed, and the processing unit 8 circulates around the leading edge of the original returned to the original stacker 3 as will be described later, and the next original is fed. For this reason, the leading edge is aligned, and the stacking original and the unprocessed original being fed are reliably distinguished. Therefore, in order to effectively exhibit these functions, in this embodiment, ribs 3a are provided on the upper surface of the original stacker 3 at appropriate intervals along the sheet feeding direction as shown in FIG. A plurality of projecting pieces 7a are provided on the lower end edge so as to correspond to the spaces between the ribs 3a to form a so-called comb tooth shape. That is, the original on the original stacker 3 is deformed into a waveform by the ribs 3a and the protrusions 7a arranged in a comb shape as shown in FIG. It is possible to effectively prevent the leading edge of the returned document (processed document) from going under the gate. The gate member 7 is formed in a U-shape in plan view, and both side surface portions 7b, 7c thereof are fixed to the front skeleton 9 of the document feeder 2 by brackets 10, 1 as shown in FIG.
The front ends of the left and right gate levers 12 and 12 'whose base ends are loosely fitted to a shaft 11 rotatably mounted on the upper side of 0', and the base ends below the brackets 10 and 10 '. It is pivotally supported by the tips of the auxiliary levers 13 and 13 'that pivotally support the parts. The gate levers 12 and 12 'have overhanging portions 12a and 1
2a 'is provided, and the shaft is correspondingly provided on the lower surface
The push-up pins 14 and 14 'planted in 11 come into contact. This shaft 11 meshes with a small gear 16 'coaxial with a gate cam gear 16 via a sector gear 15 fixed at its end, and the gate cam gear 16 is connected to an output gear 17' of a reversible drive source 17. ing. Therefore, when the shaft 11 receives the drive from the gate drive source 17 and rotates in the clockwise direction, the push-up pins 14 and 14 'move the gate levers 12 and 12' upwards through the protrusions 12a and 12a '. It is rotated to raise the gate member 7 as shown in FIG. Also, the gate member 7
When the shaft 11 is driven in the counterclockwise direction by the drive from the gate drive source 17 in the ascending position of the
The gate levers 12, 12 'mounted on the gates 14, 14' are rotated downward to lower the gate member 7 as shown in FIG. At this time, the push-up pins 14 and 14 'are arranged so that the gate member 7 can escape more than the angle at which the original stacker 3 hits the original. Therefore, the gate member 7 is suitable for pressing the original document on the original stacker by its own weight or spring. The gate member 7 follows the auxiliary levers 13 and 13 'when it moves up and down, so that the front surface of the gate is kept substantially vertical to the upper surface of the original stacker 3. That is, the gate member 7 can be placed so that the front angle of the gate can be set almost at right angles to the originals regardless of the number of originals (thickness of the original stack). The gate cam gear 16 has a detection sensor for its initial position.
A tongue piece 19 that blocks 18 is provided. The sensor 18 makes the home position of the gate cam gear 16 when it is cut off by the tongue piece 19 and causes the drive source 17 to rotate normally and reversely by a required angle. Drive source 17 in this case
It is preferable to use a stepping motor capable of pulse control. 20 is the pushing belt for pushing the document at the fixed position to the feeding position as described above, 21 is the first feeding unit for feeding the document at the feeding position from the lowermost layer, 38 is the processing from the first feeding unit 21 It is a second paper feeding unit provided in the path 35 communicating with the unit 8. A synchronization sensor (original detection sensor) 85 is provided in front of the second paper feed unit 38 as shown in FIG. The first paper feed unit 21 is a paper feed unit that is stretched between a drive shaft 23 linked to the main motor 100 via an electromagnetic clutch 21a and a driven shaft 23 'that faces the drive shaft 23. belt
21 'and a separation roller 22 that is in sliding contact with the upper surface of the separation roller 22
It consists of and. The upper belt surface of the paper feeding belt 21 'slightly projects from the rib 3a of the document stacker 3. The separation roller 22 is attached to the fixed shaft 22a via a spring clutch 24.

Therefore, the electromagnetic clutch of the paper feeding belt 21 'of the first paper feeding unit 21 is
H21a is commanded by the control means 201 provided in the copying machine main body 1.
To the detection value detected by the movement amount detection sensor 501
The ON time (paper feeding belt 21 '
Operation time) is controlled. That is, the control means 201 controls the paper feed
Of the extrusion belt 20 at the pressure contact point a between the belt 21 'and the separation roller 22.
After the leading edge of the original has been bitten by movement, or through the processing unit 8.
And received the signal that the original was returned to the original stacker 3.
After that, the electromagnetic clutch 21a is turned on and the paper feed belt 21 'is activated.
Then, the lowermost one of the manuscripts is sent out. And the manuscript
Of the document comes out from the second paper feed section 38
When kicked, after a certain count, turn off the electromagnetic clutch 21a,
Stop the first paper feed section 21 (paper feed belt 21 '). This place
In that case, the second paper feed unit 38 continues its operation. original
After the document tip kicks the document edge detection sensor 85,
The timing until the switch 21a is turned off depends on the document length.
Longer manuscript length based on the whole data table
The small and small ones should be short, and the paper feed belt 21 '
And behind the pressure contact a of the separating roller 22 (original stacker
Side), the length of the trailing edge of
It is kept constant. In other words, the second paper feed section
The amount of slip that slides on the pressure contact a when the document is fed by the 38
It is set to be constant regardless of the length of the manuscript. The spring clutch 24 of the separating roller 22 is shown in FIGS.
The protrusion 24b of the outer cylinder 24a with the clutch lever 25
The spring bosses 24d and 24d ′ by pressing the spring 24c
Can be loosened more and the separation roller 21b can rotate freely (driven rotation)
The clutch lever 25 on the protrusion 24b of the outer cylinder 24a.
The rotation of the separation roller 21b can be regulated when there is no action.
It is growing. This clutch lever 25 is the shaft
Fixed to 11 in the direction opposite to the push-up pin 14 of the gate lever
The arm 26 is pivoted at the tip of the arm 26. Obey
The gate member 7 is rotated by the shaft 11 as shown in FIG. 4A.
When it is raised via pin 14, the clutch lever 25 is lowered.
And push the protrusion 24b of the spring clutch 24 clockwise.
On the other hand, by rotating the shaft 11 in the opposite direction as shown in FIG.
When the door member 7 is placed on the original 4, the clutch lever 25
Moves upward from the protrusion 24b of the spring clutch 24,
The clutch 24 returns to the old position by the action of the built-in spring, and the separation lock
The rotation of the roller 22 will be restricted. The extruding belt 20 is a so-called semi-partially cut-out outer periphery.
Formed by a perforated belt stretched between the moon rollers 28 and 29
Has been done. The one half moon roller 28 is as shown in FIG.
The same as the paper feed belt 21 ′ through the one-rotation spring clutch 30.
In this way, the driving force can be obtained from the main motor 100.
ing. The one-rotation spring clutch 30 has a protrusion 30b provided on the outer cylinder body 30a.
Rotates in a seesaw shape around the shaft fulcrum 31 'as shown in Fig. 8A.
The outer cylinder body 30 comes into contact with the tip of the clutch lever 31 that is possible.
When the rotation of a is restricted, the built-in clutch
The latch spring 30c is loosened from the spring bosses 30d, 30d '(see Fig. 7).
The drive force from the main motor 100 is disconnected.
Meanwhile, the tip of the clutch lever 31 is as shown in FIG. 8B.
When the spring clutch 30 is disengaged from the protrusion 30b of the outer cylindrical body 30a, the clutch
The latch spring 30c tightens the spring bosses 30d and 30d '.
The drive from the main motor 100 is transmitted to the half-moon roller 28.
It is growing. The rear end side of the clutch lever 31 is the gate cam gear 16
Is pressed against the cylindrical part 16a of the spring by the spring force of the tension spring 31a.
The A cam-shaped portion 16b is formed on a part of the circumference of the cylindrical portion 16a.
It is provided. Therefore, the gate cam gear 16 is
The cam source 16b is rotated by the operation of the drive source 17 of the material 7,
Push down the rear end of the clutch lever 31 and the tip will
Be careful not to disengage from the protrusion 30b on the outer cylinder 30a of the net clutch 30.
ing. The swing of the clutch lever 31 causes the gate member 7 to swing.
Is not related to the vertical drive of the gate member 7 when the
It is performed in the rotation area of the special gate cam gear 16. That is, the game
The tokam gear 16 has the initial position detection sensor 18 as described above.
Home position determined by tongue piece 19 (indicated by symbol P in FIG. 8)
And the rotation area S in the counterclockwise direction from the point P₁
Is used to move the gate member 7 up and down, and
Transfer area S₂Is used to swing the clutch lever 31
The By the way, the gate cam gear used for this swing 16
Rotation area S₂Then push-up pin 14 escapes from gate lever 12.
I am. As described above, the tip of the clutch lever 31 projects from the outer cylindrical body 30a.
The half-moon roller 28 is turned off by the main motor, leaving the start 30b.
When the rolling starts, the gate cam gear 16 is moved to the gate drive source.
It rotates counterclockwise with the reverse rotation of 17 and the clutch lever 31
The rear end side of the cam is disengaged from the cam-shaped portion 16b, and the tip is protruded 30b
Approached the outer cylinder 30a of the spring clutch 30
The spring 31a returns it to the position
The protrusion 30b of the outer cylinder body 30a of the spring clutch that has rotated once around
Hit the tip of the clutch lever 31 again, and the main mode
Disconnect the driving force from the motor 100. Therefore, half moon roller 28
Will always make one complete revolution and stop. Further, the extrusion belt 20 is the original belt as shown in FIG.
Horizontal at multiple locations (three locations in the figure) on the draft stacker 3
It is provided in the through holes 32 arranged in a line. This transparent
The periphery of the hole 32 is at the same height as the rib 3a on the original stacker 3.
The top of the original is pulled up on the front side in the paper feeding direction.
It has an inclined surface 32a to prevent it from hanging. And above
As shown in Fig. 9, the belt surface has the cutouts of the half-moon rollers 28, 29.
When it is on the upper side, it is submerged from the through hole 32,
When the circumference area of the moon rollers 28, 29 is up, it protrudes.
The On the original stacker 3 at the first delivery of each circulation
The original 4 in the fixed position is transparent with one rotation of the half-moon rollers 28 and 29.
Extruded by friction of the extrusion belt 20 protruding from the hole 32
The In this case, the electromagnetic clutch 21a of the paper feed belt 21 'is OFF
The power from the main motor 100 is cut off.
Since it is stationary, the leading edge of the extruded document is the feed belt.
21 'and the pressure contact a of the separation roller 22 are wedged.
Become. 33 is the push-out belt 20 from the lower surface side of the document stacker 3.
The suction box provided to surround the suction
The box 33 is at the bottom of the document due to the suction action of its suction fan 34.
One of the layers is provided with a gap or a gap between the through hole 32 and the extrusion belt 20.
The suction force of the extrusion belt 20 can be effectively exhibited by adsorbing with the bolt hole.
It is configured so that it can be done. 36 is the platen glass of the copying machine main body 1 which serves as the processing unit 8.
And 37 expose the original once fed on the platen glass 36.
It is a reversal path for reversing before or after light exposure. Anti
The transfer path 37 is the back side of the double-sided original (the lower surface on the original stacker)
Can be corrected so that it faces the platen glass 36 side,
The original thus corrected and exposed is returned to the original stacker 3.
So that you can re-correct the page order
It is for the first time and faces upward from the same surface as the platen glass 36.
Draw a loop so that it joins the upper part of the forward path 35.
It has become. 39 and 40 are conveyance rollers provided in the reverse path 37.
The The second paper feed unit 38 and the conveyance rollers 39 and 40 are the main
The same feed method is always applied to the motor 100 via the one-way control mechanism.
They are connected so that they can rotate in any direction. 41 indicates the document in the forward direction on the upper surface of the platen glass 36.
And a conveyor belt for conveying in the opposite direction. This transport
The belt 41 is the main motor 1 via the forward / reverse switching means 101.
The first roller 42 on the paper feed side connected to 00 and the second roller on the paper discharge side.
It is stretched between the cable and Lara 43. Then first roller 42
The tension roller 44 is pressed against the upper belt surface near the
The lower belt surface is platen-garaged by multiple pressing rollers 45.
It is designed to be in sliding contact with the space 36. The first roller 42 and the second roller 43 are tied as shown in FIG.
They are connected to each other by a ming belt 46. in this case,
The timing pulley 47 on the first roller 42 side is the first roller shaft 42.
The timing pulley 48 on the second roller 43 side is fixed to a.
Mounted on the second roller shaft 43a via the one-way clutch 49.
It has been. The peripheral speed of the first roller 42 is a one-way clutch.
Slightly faster than the peripheral speed of the second roller 43 driven via 49
It is configured for speed. Therefore, the conveyor belt 41
Is the first row when rotating in the forward direction (arrow in Fig. 10)
Drive with the driving force from the rack 42, and the lower belt surface is not on the slack side.
It has become so. In this case, the second roller 43 is unidirectional
It is designed to slip with the clutch 49, but
For some reason, for example, slippage with the first roller 42
Occurs, and the driving force is not sufficiently transmitted,
One-way clutch that locks when driving speed decreases
The second roller 43 becomes the driving side by the action of
It is designed to drive the Rult 41. In addition, the transfer
When the belt 41 is rotated in the opposite direction (counterclockwise)
In this case, the one-way clutch 49 is locked and the second roller 43 is
It is the driving side of the conveyor belt 41. That is, the conveyor belt 41 is
When one roller 42 runs on the drive side,
There are cases in which LA 43 runs on the drive side. This is Hara
Synchronous exposure is performed while sending the draft on the platen glass
This is especially effective in the case. Reference numeral 50 denotes an original document sheet provided at the end of the platen glass 36 on the paper discharge side.
At the topper, the stopper 50 is at the center as shown in FIG.
Part is connected to one end of actuating lever 51 that can rotate like a seesaw
It is pivotally supported by a shaft 52 and is connected to the other end of the operating lever 51.
By the action of the solenoid 53 and the spring 51 'facing it
It is possible to appear and disappear on the platen glass 36
The This document stopper 50 can be used to
Carry on the platen glass 36 at the synchronous exposure speed with the conveyor belt 41.
While it is being sent, it is fixed in place under the platen glass 36.
With the optical system 54 fixed, which allows you to select the fixed and movement modes,
If you are exposing to create an image on the drum
The original and insert the original as in ADF or SDF mode.
The optical system 54 is stopped by stopping at the exposure position on the ten glass 36.
When creating an image on the drum by exposing while moving
Works to project above the platen glass. 55 is a continuous paper ejection guide on the exit side of the platen glass 36.
The plate, 56 is a discharge belt. The discharge belt 56 is
It is pivotally supported immediately after Tucker 3 and linked to main motor 100.
Along the drive roller 57 and the upper and lower surfaces of the original stacker 3
The upper and lower sides are rotatably supported so that they can move horizontally.
The end rollers 58, 59 and the discharge guide plate 55 near each other
A roller group consisting of auxiliary rollers 60 and 61 that are axially supported
So that the rear side of the original stacker 3 is rolled into a C-shape
It is stretched around the conveyor belt by the rotation of the drive roller 57.
The original sent from the 41 can be conveyed in the paper discharge direction.
It has become. The upper and lower end rollers 58 and 59 of the discharge belt 56 are
As shown in the twelfth illustration, provided on both side skeletons 62, 62 of the document feeder 2.
The two parallel horizontal grooves 63 and 64 are slid through roller members.
Between the upper moving bodies 65 and 65 and the lower moving body 6 which are movably held.
It is mounted between 6 and 66, and the moving body 65 and 6 respectively.
6 is a sprocket which is axially supported by two pieces in front and behind the skeletons 62 on both sides.
Ket (can be replaced with wire pulley) 67,67 ',
The upper side of the chain (wire) 69 stretched over 68 and 68 '
And the lower side via attachments 70 and 71.
Then, one sprocket 67 can be used in both normal and reverse directions as shown in FIG.
Connected to an effective chain drive source 72 through an intermediate gear 72 '
There is. Therefore, when the chain drive source 72 rotates forward and backward,
When 69 travels, upper end roller 58 and lower end roller 59
Will move in opposition to each other, and the discharge belt 56
The belt tension will always be kept constant. The moving mechanism of the discharge belt 56 is placed on the original stacker 3
The above-mentioned rear end regulation that hits the rear end when setting the draft
The rear end is configured as a movement control mechanism for the plate 5.
The regulation plate 5 is provided on the upper moving body 65 in front of the upper end roller 58.
It is installed so as to cover. And at its bottom edge
The document stacker 3 is installed on the rear upper surface and is parallel to the paper feeding direction.
Providing a convex portion 5a that can be fitted in the concave portion 3b of the shallow concave-convex portion,
So that the document to be pushed out does not get under the trailing edge regulation plate 5.
It is composed. Then, the rear end regulation plate 5 is attached to the chain 69.
Provided on the attachment 70 coupled to the upper side
The home position sensor 73 is blocked by the blocking member 74.
The position that was set is the home position (initial position). This ho
The original is the maximum size (for example, A3 size)
It is the position where the rear end of the can be struck. The rear end regulation plate 5 is at the home position as shown in FIG.
5p is the starting point to move forward, and the tip of manuscript 4 pushed to this
The edge is detected by the stack sensor 27, and the detection signal
When the control unit 721 receives the signal, the control unit 721 waits for a certain number of pulses.
21 stops the chain drive source 72 and moves its position to the forward point 5p.
₁, 5p₂… As 5pn (the forward point moves depending on the size of the original)
It can be controlled to move backward. In this case,
Although it may be moved back to the home position, in this embodiment,
Sensor for detecting the amount of movement of the rear end regulating plate 5 from the front of the boot member 7
-Document size determined by the detection value detected by 501
Move backward by (length of original in the feeding direction). That is, Hara
The amount is almost equivalent to the amount that the tip of the manuscript passed through the gate member 7.
The trailing edge when re-feeding the originals
The amount of advance of the regulation plate 5 is minimized. 75 and 76 are ejected at the positions corresponding to the auxiliary rollers 60 and 61.
Touch the paper discharge belt 56 from the outside of the paper guide plate 55 through the through hole.
The pressing roller in contact with 77 is a skeleton on both sides 6 of the document feeder 2.
2 Ceiling guide plate with the base end hinged to the upper part of the rear end, 78
Is ejected to the upper stage moving body 65 which is mounted on the upper end roller 58.
Make a slight gap on the upper surface of the upper belt of belt 56
The discharge port guide plate, 79 is the upper surface of the discharge port guide plate 78.
Through the through hole to the press belt
It is La. The ceiling guide plate 77 is attached to the lower surface that serves as a guide surface.
Is provided with a plurality of ribs 80 facing the paper discharge direction,
The ribs are designed to be directional
80 is installed on the upper edge of the rear plate that is inclined upwards of the exit guide plate 78.
The recessed groove 81 fits like a nest and guides the ceiling guide plate 77.
Documents that have moved forward on the surface are ejected from the ejection guide plate 78 and the ejection belt 56.
It is configured so that it can be reliably guided between and. Reference numeral 82 denotes a processed document provided in the middle of the discharge guide plate 55.
Circulation discharge path A toward the document stacker 3 and discharge from outside the machine
With the switching claw that switches between the outboard discharge path B toward the tray 83,
The switching claw 82 returns the rear end regulating plate 5 to the home position.
When returning, move to open the paper ejection path B outside the machine,
Circulation output when the trailing edge regulation plate 5 is not at the home position
It is designed to be movable so as to open the path A. this
The switching operation uses a solenoid but other suitable machine
You may go to the physical mechanism. Reference numeral 84 denotes a hinged connection of the base end side to the upper end surface of the ceiling guide plate 77.
It is a combined manual feed plate, and the manual feed plate 84 is normally as shown in FIG.
It is folded so that it overlaps with the upper surface of the ceiling guide plate 77.
Hinge joint when feeding documents one by one in DF mode
It can be developed to cover the document stacker 3 with the fulcrum as a fulcrum.
It is like this. At the time of this expansion, the tip of the manual feed plate 84 is fed.
It reaches near the paper belt 21 '. In addition, on the manual feed plate 84
Shows the size of the document to be fed on the top side when opened.
The mark is attached so that the original insertion position can be identified.
The Furthermore, when the manual feed plate 84 is unfolded, an SDF (not shown)
It is convenient to configure the actuator for power ON
Is. As shown in FIG. 15, the copying machine main body 1 includes
Paper is fed from the document stacker 3 and passed through the forward path 35
The light from the optical system 54 is exposed on the original sent to the glass 10 36.
The light from the source 541 is emitted, and the reflected light is passed through the mirror.
Irradiate the photoconductor drum 211. Around the photosensitive drum 211
The charger 212, the developing device 213, the transfer device 214 and the cleaning device
Box 215 is provided, and it can be rotated with the photosensitive drum 211.
Feed transfer sheets from the sheet storage container between the copying machine 214
Paper feeding means 216a to 216c, which fixes the developer on the sheet after transfer.
A fixing device 217 for wearing is provided. Original with the transfer device 214
The copy sheet obtained by transferring the draft information is
When only surface copying is required, send to the final processing unit 300
If you need a copy on the back side (duplex copying),
A branch provided in the middle of the passage 218 to the final processing unit 300
A sheet stack provided below the photosensitive drum 211 from the point 219.
It is stored in the car 220 with the copy side facing up.
Single-sided copy sheets stored in this sheet stacker 220
Is sent out from the bottom by the paper feeding means 221, and the blank side of the back
Is supplied to the transfer device 214 with the photosensitive drum 211 side facing the photosensitive drum 211 side.
After the surface copy, it is sent to the final processing unit 300 via the fixing device 217.
It is done. This final processing unit 300 is a pan for punching binding holes in copy sheets.
Stitching means using stapler and stapling means
Lower tray 301 with and without such means
It has an upper tray (offset tray) 302.
If the final processing mode is selected, the copy sheet
Are stored in the lower tray 301, and are
It comes to be accommodated in the upper tray 302 via the junction point 303.
ing. This upper tray 302 holds copy sheets constant for each page.
Means for stacking and accommodating by shifting the quantity alternately are provided.
The later sorting work is made easier. In the above embodiment, the originals are stacked in page order from the top.
After layering and in the home position with the side to be copied facing up
On the document stacker 3 so that the rear edge of the edge regulating plate 5 abuts
And set the width of the document to match the original.
After moving 6 and 6 ', enter the number of copies to make and copy button
When is turned on, the moving position of the width regulating plates
-601, the detection signal is controlled by the document feeder
It is output to the part 721. Also, when the copy button is turned on as described above, the gate
The drive source 17 is activated, and the gate document 7 is placed under
Raise to a position where you can fully enter. Next, the chain drive source 72 is started and the intermediate gear 72 ', the sp
Rotate the chain 69 forward through the rocket 67,
Attached to the upper and lower sides of 69 via attachments 70 and 71
The upper end roller 58 axially mounted on the upper moving body 65
The lower end roller 59, which is axially mounted on the lower stage moving body 66, is moved forward.
Move it backwards. Attached to this upper moving body
The trailing edge regulating plate 5 moves forward while pushing the trailing edge of the document,
The leading edge passes under the gate member 7, but the tip of the original
When the edge is detected by the stack sensor 27, the document feeder
The control unit 721 of No. 2 stops the chain drive source 72.
The At this time, the movement amount detection sensor 501 of the rear end regulating plate 5
The length of the document is detected by the
Output to the control unit 721 of the device 2 and the main body of the copying machine
1 is output to the control means 201. Therefore, the control unit 721 of the document feeder 2 controls the gate drive source 1
7 is reversed and the gate member 7 is lowered, but at this time
Pin 14 planted on shaft 11 is more than gate lever 12
Since the gate member 7 rotates to a position away from it and escapes,
Do not press the upper surface of the draft downwards by its own weight or spring force.
The The lower edge of the gate member 7 has a comb-like shape.
The original stacker 3 and the upper rib 3a of the original stacker 3
Press the paper feed belt 21 while deforming it into a shape. As mentioned above, the push-up pin 14 is sufficient for the gate lever 12.
At the remote position, the gate cam gear 16 is the gate drive source.
It rotates by 17, and its cam forming part 16b makes one rotation spring club.
Clutch lever locked to the protrusion 30b of the outer cylinder 30a of the switch 30
Raise and lower 31 to move half-moon rollers 28, 29 to main motor 1
Connect the paper to 00 and run the extrusion belt 20.
Is pushed toward the pressure contact point a between the belt 21 'and the separation roller 22.
The At this time, the electromagnetic clutch 21a is off,
Since the belt 21 'is stopped, the pushed original is fed.
The pressure contact point a between the belt 21 and the separation roller 22 enters in a wedge shape. Next, the control means 201 of the copying machine main body 1 uses the electromagnetic clutch 21a.
Turn ON and operate the paper feed belt 21 '. Therefore, the bottom layer
One manuscript is sent out. This paper feed belt 21 'times
The extruding belt 20 also operates at the same time as it turns, and
The paper is adsorbed and extruded in the paper feeding direction. Thus, one sheet of original sent by the paper feed belt 21 '
The tip of the manuscript enters the forward path 35 and the second feeding
It is nipped in the paper section 38 and the leading edge of the document
When you get out and kick the document edge detection sensor 85,
The electromagnetic clutch 21a is turned off at the timing
21 (paper feed belt 21 ') is stopped. The second paper feed section 38
Is continuously driven even after the paper feed belt 21 'is stopped.
Therefore, the original is sent to the platen glass 36 at the synchronous exposure speed.
And is transferred to the conveyor belt 41. In this case, the leading edge of the original
Is installed in the middle of the forward path 35 (in front of the second paper feed section 38).
The optical system 54 after a certain pulse after crossing the sensor 85.
Then, the image of the document information is created on the photosensitive drum. That
The control means 201 of the copying machine main body 1 operates the photosensitive drum 211.
Copy paper from the paper feeder 216 at the timing that matches the image
The paper is fed to the transfer device 214. Note that the time from ON to OFF of the electromagnetic clutch 21a is the document length.
Based on the data table determined by
And the rear of the pressure contact a of the separation roller 22 (original stack
The length of the trailing edge of the original that remains on the
Instead, it is kept almost constant. Thus, the original document after the exposure processing is placed on the discharge guide plate 55.
Document stacker by the discharge roller 56 while moving up along
It is discharged toward 3. In addition, the originals discharged on the original stacker 3 are
The front and rear ends are aligned by the material 7 and the rear end regulating plate 5,
It is re-stacked in a state where the width is made uniform by the control plates 6 and 6 '.
The Therefore, the paper feeding performance during the next paper feeding will be improved.
The The sending operation is defined for each copy size and copy ratio.
Gate section by changing the delivery timing and synchronous transfer speed
Repeat until there is no manuscript under the material. And under the gate
Stack sensor 27 detects that there are no more originals
Check that the last document has been ejected by the paper ejection sensor 86.
When it is taken out, the gate member 7 is lifted again to move the rear end regulating plate 5
Feed the stack of documents with and hold until the set number of copies is completed.
Repeat the above operation. Then the set number of copies was completed,
Is detected by the paper discharge sensor 86, the trailing edge regulating plate 5 is
Return to the home position of and prepare for the next movement. The above operation is for single-sided copy in RDF mode.
Is. Therefore, the platen glass 36 of the copying machine body 1 is discharged.
The document stopper 50 on the edge of the paper is the platen glass 36
The exposure optical system 54
Is in fixed position fixed mode, but this is ADF mode
If the exposure optical system 54 is in the moving mode when set to
In both cases, the original scans provided at the edge of the platen glass 36 on the paper discharge side.
The topper 50 protrudes above the surface and hits the original document
Position (that is, the exposure position), and the exposure optical system 54 moves.
After the set number of copies has been copied,
By retracting the document stopper 50 and restarting the discharge belt 41,
Paper is sent in the direction of paper ejection, and the cutting guide provided in the middle of the paper ejection guide plate 55
The paper is ejected from the external paper ejection port to the paper ejection tray 83 through the replacement pawl 82. If you want to make a double-sided copy of a single-sided original, first copy the original.
The original set on the stacker is unexposed
The number of drafts is counted and it is judged whether it is an even number or an odd number. This
In case of, the number of sheets is counted by the sensor in the middle of the forward path 35.
To activate a counting counter (not shown) via 85
Is done by. As a result, if the number of manuscripts is 4
For example, on the main body 1 side of the copying machine, from the document feeder 2 to the platen glass.
The final fourth page sent to page 36 is printed on one side of the transfer paper.
make a copy. Then, the original is returned to the original stacker 3 and
The copy paper is below the photoconductor drum (not shown)
The copy surface is on top of the transfer paper stacker (not shown)
Stack so that This one sided copy paper
Is the platen glass from the document feeder 2
When it is sent to the stack, the transfer paper stack is synchronized with this.
Feed the photoconductor drum from the car with the non-copy side facing up.
It is printed and the third page is copied and discharged. Similarly, 2
Repeat page, page 1, but if there are 3 pages
In case of copying, copy the final 3rd page and immediately eject it, then 2 pages
Transfer the transfer paper with the copied eyes to the transfer paper stacker
Feed from the stacker, copy the first page, and eject
The Rukoto. If you want to copy 1-sided originals on both sides,
Documents sent from -3 pass through the forward path 35 and platen
When the paper is fed to the glass 36, it will be the final on the platen glass 36.
Since the page will be on top, feed once to the 36 side of the platen glass
Stops when the trailing edge of the printed document is placed on the glass
After that, the conveyor belt 41 is rotated in the reverse direction, and the original is reversed in the path 37.
The original, and flips the manuscript like a somersault,
Fixed optical system 54 on platen glass 36
Exposure, and in synchronization with this, the paper feeder 21 of the copying machine main body 1
Copy on the copy paper fed from 4. This is a copy
The transferred paper is ejected as it is. Original after exposure
The draft is again in the reversing path by reversing the conveyor belt 41.
The page order is corrected through 37, and the other page is
It is exposed below on the platen glass 36
It is copied to the next copy paper fed from the paper feeder. Shi
After copying, it is returned to the original stacker 3. This work
By repeating the operation, the one-sided copy of the two-sided original is completed. If you want to make a two-sided copy of a two-sided original, first
Copy only the page. In other words, copy the manuscript
After feeding on the lath, it is reversed through the reverse path 37 and even pages
Exposure with the face down and make a single-sided copy of the transfer paper. Shi
After that, the original is passed through the reversal path 37 again and is not exposed.
Transfer paper to stacker 3 and transfer paper on one side
Is stacked on the copy paper stacker in the copier body 1.
The In this way, copying of all even pages is completed.
After that, copying of odd pages is started. This odd number
When copying a page, it becomes unnecessary to reverse the original.
The transfer paper is sent out from the transfer paper stacker, and
The copy is made on the opposite side of the transfer paper. That is, 4 pages
3 pages on the opposite side of the transfer paper on which the second page is copied
On the other side of the eyes and the second page, copy the first page and so on.
-It will be done. [Advantages of the Invention] As described above, the present invention is a sheet feeding device having a drive source.
And a separation roller that is in non-rotational sliding contact with the paper feeding means.
Hold and separate the originals on the original stacker one by one
Communication between the first paper feed unit and the platen glass from the first paper feed unit
In a document feeder that has a second paper feed section in the
Document length detection to detect the document length on the document stacker.
Incorporating intelligent means, corresponding to the document length detected by the means
Providing control means for changing the operating time of the first paper feeding unit
Because it is characterized by the fact that the
The length from the pressure contact between the paper belt and the separation roller to the rear edge of the document
That is, the amount of slip of the document sent by the second paper feed unit is constant
Therefore, depending on the size of the original, the timing of synchronous exposure may vary.
It also has the excellent effect of preventing rattling.
Is.

[Brief description of drawings]

1 to 15 show an embodiment of the present invention, FIG. 1 is a front sectional view of a document feeder, FIG. 2 is a perspective view showing a document stacker and a sheet feeding mechanism, and FIG. 3 is a gate member. Explanatory diagram showing the deformed state of the originals pressed on the original stacker,
4A and 4B are explanatory views showing the operating state of the gate member, and FIG.
Figure 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, Figure 7 is a perspective view of the rotation control mechanism of the half-moon roller, and Figures 8A and 8B are the same rotation. 9A and 9B are explanatory views showing an operating state of the extrusion belt (half-moon roller), FIG. 10 is a perspective view of the drive system of the conveyor belt, and FIG. 11 is a document stopper. 12 is a perspective view showing the rear side of the document stacker, FIG. 13 is a schematic perspective view showing the drive mechanism of the discharge belt and the trailing edge regulating plate, and FIG. 14 is the document. FIG. 15 is an explanatory view of the control system of the conveying device, FIG. 15 is an explanatory view of the structure of the copying machine main body and its control system, and FIG. 16 is a schematic explanatory view of a conventional paper feeding mechanism. 1 ... Copier main body 2 ... Original feeding device 3 ... Original stacker 4 ... Original 5 ... Rear end regulation plate 20 ... Extrusion belt 21 ... First paper feed section 21 '... Paper feed belt 22 ... ... Separation roller 27 ... Stack sensor 38 ... Second paper feed unit 85 ... Original document edge detection device sensor (synchronous sensor) 201 ... Copier body control means 501 ... Moving amount detection sensor (document length detection means) 601 ...... Position detection sensor (document width detection means) 721 ...... Control section of document feeder

Claims (1)

[Claims] 1. A first paper feed unit having a paper feed unit having a drive source and a separation roller which is in sliding contact with the paper feed unit in a non-rotating state, and frictionally separates the documents on a document stacker one by one. And a second sheet feeding section in a path communicating from the first sheet feeding section to the platen glass, the original document conveying apparatus having a document length detecting unit for detecting a document length on the original stacker, An original conveying apparatus comprising a control means for changing the operation time of the first paper feeding section in accordance with the original length detected by the means.