JPH0664301B2 - Sheet document feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Purpose of the invention [Industrial field of application] The present invention is an apparatus for automatically feeding a sheet original to an image reading unit by equipping a copying machine, a facsimile or other image processing apparatus. Feeder, hereinafter abbreviated as DF device).

[Conventional technology]

The DF device is extremely effective in improving the efficiency of copying work, etc., and the method of manually introducing the sheet document into the DF device is a method of manually feeding, and the document is equipped with a separate feeding mechanism for each sheet. A type that automatically introduces the sheet documents stacked and set in the introduction part from the top or bottom one, a circulation feed system that automatically returns and conveys the discharged documents to the document introduction part, double-sided image Various types of systems / mechanisms such as those equipped with an automatic reversing and re-feeding mechanism for documents are put to practical use.

On the other hand, in the case of a copying machine, for example, the image processing apparatus, which is a main body of the present invention, is a small-sized portable type called a personal type, as opposed to a large-sized high-speed or general large-sized / medium-sized model.
Lightweight and low-priced light-duty models have been developed and marketed, and are becoming very popular.

[Problems to be solved by the invention]

However, even a light-duty model such as a personal type can be provided with a DF device to improve the efficiency of copying work.
However, the conventional DF device was originally developed for a high-speed, high-speed or general-type image processing device, and is itself a fairly complicated mechanism, and a high-grade / expensive device. It is unsuitable because it is too functional, expensive and expensive.

Therefore, it is strongly desired to develop and popularize a simple and inexpensive DF device with a simple mechanical structure that is suitable for mounting on an image processing device of a light type such as a personal type and is highly reliable. There is.

An object of the present invention is to provide a simple DF device that can sufficiently meet this demand, and it is a practical DF device of a type that is used especially for an image processing device of a platen moving type.

B. Configuration of the Invention [Means for Solving the Problems] That is, the present invention relates to a raising / lowering member which is locked to a main body of an original moving type image processing apparatus and which can be freely moved up and down with respect to the original surface. A sheet that comes into contact with the document table surface at a position substantially corresponding to the position of the image reading unit of the image processing apparatus with the document table in the tilted state with respect to the document table surface, and rotates or rotates following the document table movement. A document feeding member, a document introduction port for introducing a sheet document between the document table surface and the sheet document feeding member which are in contact with each other, and a document table surface which projects in a state in which the raising / lowering member is tilted with respect to the document table surface. Contact the
The sheet that has passed through the image reading section is separated from the original table surface by the cooperation of the movable original table and the sheet original feeding member, but when the tilting member is opened and raised, the sheet is retracted inward to be stored. A gist of a sheet manuscript feeding device comprising a manuscript peeling member and a discharge port of a sheet manuscript peeled from a surface of a manuscript table.

[Action]

Place the above-mentioned sheet original feeding device against the original table surface of the main body of the image processing apparatus, insert the sheet original through the original introduction port, and place the leading edge of the sheet original between the original table surface and the sheet original feeding member. Hold it in the mouth. In this state, when the document table is driven to move in the direction to convey the document to the image reading section by the operation of the image processing apparatus main body, the above-mentioned inserted sheet document is pressed against the document table surface by the sheet document feeding member. While being inserted, the movable document table and the sheet document feeding member cooperate with each other to automatically and automatically draw in between the document table and the sheet document feeding member, and adjust the position of the image reading unit in close contact with the moving document table surface. Pass through in sequence. In the process of passing through the position of the image reading unit, the images on the document surface are sequentially read from the leading edge side to the trailing edge side, and image processing such as copying is executed by the image processing apparatus main body.

Then, the leading edge side of the automatically fed document passes through the image reading portion position, and when it reaches the sheet document peeling member position, it is peeled and separated sequentially from the document table surface and is deflected and guided to the discharge port side.
With the subsequent movement of the document table, the document is finally completely ejected from the sheet ejection device to the outside of the sheet document feeder.

〔Example〕

FIG. 1 is a partially cutaway external perspective view of a DF device portion of an image processing device A equipped with a DF device A according to the present invention, FIG. 2 is a vertical sectional front view including the image processing device B, and FIG. FIG. 4 is a vertical sectional view of the DF device portion, FIG. 4 is an enlarged sectional view of the mode switching frame portion, and FIG. 5 is a plan view of the DF device with the cover plate removed.

(1) Image Processing Device B The image processing device B (FIG. 2) of this example is a drum-type electronic copying machine that moves a document table according to the Carlson process. Fifty
Is an exterior casing of a copying machine, and has copying execution devices 51 to 62 built therein. That is, reference numeral 51 denotes a photosensitive drum which is rotationally driven around the shaft 51a in a direction indicated by an arrow at a predetermined peripheral speed, and positive or negative uniform charging by the charging device 52 → document illuminating device 53.
And image exposure (slit exposure) by the short focus lens array (product name SELFOC) 54 → toner development by the developing device 55 of the electrostatic latent image formed on the drum surface → charging device 56 for transferring the toner developed image Transfer to the transfer material by means of the process of fixing the image of the transfer material having undergone the toner image transfer by the fixing device 59, and the copy is discharged through the discharge port 63.
From the machine to the copy tray 64 outside the machine. 57 is a cleaning device for cleaning the drum surface after the toner image transfer, 58 is a conveying device for introducing the transfer material separated from the drum surface through the image transfer portion to the fixing device, and 60 is a loading / unloading device for the copying machine. This is a free transfer material cassette, and the transfer materials stacked and stored in the cassette are fed one by one by a paper feed roller 61 and introduced between a drum 51 and a transfer charging device 56 via a registration roller pair 62. .

Reference numeral 65 denotes an upper surface plate of the outer casing 50 of the copying machine, 1 denotes an original exposure slit hole as an image reading portion formed in a width direction of the upper surface plate at a substantially central portion of the upper surface plate, and the photosensitive drum 51 has a lower portion below the slit hole 1. The longitudinal axis of the slit hole 1 and the generatrix of the photosensitive drum 51 are parallel to each other. The short focus lens array 54 is located between the slit hole 1 and the photosensitive drum 51. The document illumination device 53 has a slit hole 1
The part is illuminated from the bottom evenly in the longitudinal part.

Reference numeral 2 is a transparent glass plate or the like which is arranged above the upper plate 65 of the exterior casing of the copying machine so as to be slidable in the left-right direction on the upper plate through guide rails 5 and 6 (Figs. 1 and 3). It is a movable platen made of flat plate. Specifically, an edge member 3 and a relatively wide extension plate portion 4 are provided on the front side edge portion and the back side edge portion of the document table 2, respectively, and the edge member 4 and the extension plate portion 4 are placed on the upper surface plate 65, respectively. And is supported by the left and right guide rails 5 and 6.

The original table 2 is always on standby at the home position at the position indicated by the solid line in FIGS. 1 and 2 which is within the surface range of the upper plate 65 of the outer casing of the copying machine. Thus, each time a copy start signal is issued from a control circuit (not shown), a reciprocating drive mechanism (not shown) such as a pinion rack mechanism or a rope mechanism operates to move the upper plate 65 on the upper right side in FIG. The forward movement a is performed until the forward movement end position a'indicated by a two-dot chain line, and then the backward movement b is immediately performed in the opposite left direction. This backward movement b of the document table is continued until the document table passes the first home position and further reaches the backward movement end position b'in the three-dot chain line on the right side. Immediately after reaching the backward movement end position b ', the movement is again changed to the forward movement a and returned to the initial home position to complete one reciprocating cycle and enter the standby state. Here, the forward movement of the original table 2 from the home position to the forward movement end position a ′ and the forward movement of the backward movement end position b ′ to the home position are respectively for convenience sake.
It is called the first half forward and the second half forward.

Reference numeral 7 denotes a rail strip formed on the upper surface of the extension plate portion 4 of the document table 2 along the longitudinal direction in the direction of movement of the document table, and 8 denotes a stationary member 66 integrated with the outer casing of the copying machine on the side facing the extension plate portion 4. Rails formed in the direction of movement of the platen, and thus rails parallel to the rails 7 and 9 are engaged with the rails 7 and 8 via engaging rails 10 and 11, respectively. A slide plate freely slidable along the lines 7 and 8, and 12 is connected to the platen 2 side of the slide plate 9 via an extension plate portion 12A so as to be tiltable with respect to the platen 2 around the shaft 13 as a center. In the original pressing plate, a hard exterior plate 12a, a relatively thick hard material layer 12b such as a synthetic resin sponge attached to the back surface side thereof, and a white sheet 12c such as an EVAL sheet attached to the lower surface thereof. Therefore, it is possible to cover the entire upper surface area of the document table 2 sufficiently. Having a size that.

(2) Sheet mode / book mode switching mechanism 14 is a sheet mode switching state in which the slide plate 9 connected to the document pressing plate 12 is locked to the side of the immovable member 66 integrated with the exterior casing of the copying machine, the document table. It is a mode switching piece that selectively switches to three states, that is, a book mode switching state in which it is locked to the 2 side, and a neutral state in which it is not locked to any of the stationary member 66 side and the document table 2 side.

In this mode switching piece 14, a finger hook knob 14a is projected to the upper surface side of the slide plate at a substantially central portion of the slide plate 9, and first and second locking pieces 14b and 14c are integrally formed at the lower end of the knob 14a. Engaging rail 10 on the back of the slide plate
It is located between 11 and is freely slidable along the guide elongated hole 15 in the width direction of the slide plate 9, that is, in the direction substantially perpendicular to the slide direction along the rails 7 and 8 of the slide plate 9. The knob 14a is attached along the guide hole 15 to the original holding plate 12.
The sheet mode switching position S when the knob position is moved to the hole end position on the side opposite to the sheet side, and conversely the book mode switching position B when the knob position is moved to the hole end position on the document holding plate 12 side. The intermediate position between the two is the neutral position N
Is.

When the knob 14a is positioned at the neutral position N, the first and second locking pieces 14b.1 of the mode switching piece 14 are
4c does not engage with either the stationary member 66 side or the document table 2 side, and the slide plate 9 (that is, the document pressing plate 12) is attached to the document table 2 or the copying machine main body along the rails 7 and 8. On the other hand, it is free to slide and move independently in the left-right direction.

The knob 14a is positioned at the neutral position N, and the slide plate 9 is moved along the rails 7 and 8 to move the original holding plate 12 to the original table 2 which is in the standby position at the home position.
When the knob 14a is slid to the seat mode switching position S in a state where the knobs are just aligned and aligned (Figs. 1 and 2), as shown in Figs. The front end of the stopper 14b is fitted into the notch 8a formed in the side of the rail strip 8 on the side of the stationary member 66 through the hole 11a formed in the side surface of the engaging rail strip 11. As a result, the slide plate 9, that is, the document pressing plate 12 is fixed to the immovable member 66.
When the original table 2 is moved and driven so that it is integrally locked to the side of the copying machine body (sheet mode switching state), the original pressing plate 12 does not move and only the original table 2 is driven to move. become.

When the knob 14a is slid to the book mode switching position B, the tip of the second locking piece 14c of the top 14 passes through the hole 10a formed in the side surface of the engaging rail 10 and the rail on the extension plate 4 side of the document table. It is in a state of being fitted into the notch portion 7a formed on the side portion of the strip 7. As a result, the slide plate 9
That is, the document holding plate 12 is locked integrally with the document table 2 (book mode switching state), and when the document table 2 is driven to move, the document pressing plate 12 also moves together with the document table 2. become.

(3) DF device A In the DF device A of this embodiment, the document holding plate 12 is also used as a tilting member, and is attached to a substantially central portion of the document holding plate.

Reference numeral 16 denotes a slit opening formed in the widthwise direction of the document holding plate 12 at a substantially central portion thereof. The slit opening 16 aligns the document holding plate 12 with the document table 2 which is in the standby position at the home position. Then, when the document holding plate 12 is laid down on the document table 2 with the knob 14a switched to the position of the sheet mode S or the book mode B, the image reading of the upper plate 65 of the main body of the copying machine through the document table 2 is performed. It faces the original document exposure slit hole 1 as a part.

The side wall on the left side and the side wall on the right side of the slit opening 16 are respectively inclined surfaces 12 which are inclined downward toward the back side of the document holding plate.
d · 12e (FIGS. 2 and 5).

Reference numerals 17 and 18 (Figs. 1 to 3 and 5) show side plates formed by elevating the upper surface of the document holding plate at the front and rear ends of the slit opening 16, and 19 shows the front plate 17 to the front side. A handle for opening and closing (tilting) the document holding plate that is formed by extending and projecting 2
Numerals 0 and 21 are bearing plates integrally attached to the inside of the both side plates 17 and 18.

Reference numeral 22 denotes a paper discharge roller shaft rotatably supported by the bearing plates 20 and 21, and 23 denotes a plurality of paper discharge rollers fixed along the length of the shaft 22 at intervals. This is a friction roller made of elastic sponge such as moltoprene. Each of these paper discharge rollers 23 is always in proper contact with the inclined side wall surface 12e on the right side of the slit opening 16.

Reference numeral 24 denotes a thin sheet-like elastic member (for example, polyethylene terephthalate sheet (trade name Mylar)) as a sheet document peeling member, which is attached along the length to the inclined side wall surface 12e on the right side of the slit opening 16. The lower edge portion thereof extends from the slit opening 16 to the back side of the document holding plate 12, and when the document holding plate 12 is laid down on the document table 2, the document plate 2 is appropriately bent against the elasticity. It comes into contact with.

25, 26, 27, (FIGS. 5 and 3) are a position near the front end of the discharge roller shaft 22 and a position near the rear end.
The first, second, and third arm members, 28 (fifth and fifth arms), which are positioned at three positions nearer to the front end than the longitudinal center of the shaft 22 and are swingably supported about the shaft 22, respectively. Similarly, a timing roller fixed to the front end of the discharge roller shaft 22 is shown, 29 is a sheet original feeding roller shaft 30 supported by bearings between the tip ends of the second and third arm members 26 and 27, and 30. A plurality of sheet original feeding rollers rotatably supported individually on the shaft 29 at intervals along the longitudinal direction of the shaft, located in the slit opening 16, and holding the original pressing plate 12 on the original table 2. When it is tilted up, it comes into contact with the document table 2 surface portion substantially corresponding to the position of the image reading unit 1 of the image processing apparatus main body.
Reference numeral 31 (FIG. 5) is a rotary shaft bearing-supported at the tip of the first arm member 25, 32 is a drive take-off roller fixed to the rotary shaft, and 33 is a one-way clutch 33 on the shaft 31.
A timing roller 34 is attached and supported via a, and a timing belt 34 is suspended between the timing roller 33 and the timing roller 28 fixed to the paper discharge roller shaft 22. The drive take-up roller 32 comes into contact with the upper surface of the front edge member 3 of the document table 2 when the document pressing plate 12 is pushed down on the document table 2.

Reference numeral 35 denotes a cover plate that covers the space between the front side plate 17 and the back side plate 18, and is detachably attached to the upper bent edges of the front bearing plate 20 and the back bearing plate 21 with screws 36. Reference numeral 37 is a fin plate for guiding sheet originals arranged in parallel on the back side of the cover plate, and 38, 38 and 39 are leaf springs similarly mounted and supported on the back side of the cover plate. The side is in contact with the upper side of the sheet original feeding roller shaft 29. The leaf spring 39 is in contact with the upper surface of the first arm member 25. When the document pressing plate 12 is tilted with respect to the document table 2 by the pressing force of the leaf springs 38, 38, 39, the contact state of each sheet document feeding roller 30 with the document table 2 surface, and the driving force. The document table front edge member 3 of the roller 32
The contact state with the upper surface of the is stably and elastically maintained.

Reference numeral 40 is a sheet original introduction port, 41 is the same discharge port, 42 is a sheet original introduction guide tray which is arranged on the upper surface of the original document holding plate on the side of the sheet original introduction port 40 so as to be tilted up and down around a shaft 43,
The stand 44 can be held in an upright posture by inclining it toward the sheet document introduction port 40, and by folding the stand 44 around the shaft 44a toward the back side of the tray 42, it is tilted to the upper surface of the document holding plate. (Fig. 2, dashed-dotted line in Fig. 2, Fig. 7). Reference numeral 42a is a sheet document side edge guide side wall formed upward along the inner side edge of the tray. Reference numeral 44b (FIG. 2) is a plurality of stand lower end receiving projections formed on the upper surface of the document holding plate, and the inclination of the tray 42 can be adjusted by selecting the projections for receiving the stand lower end. Reference numeral 44c denotes a holding state holding piece of the tray 42 with respect to the document holding plate 12, which is formed on the back side of the tray 42 and is provided on the left side wall surface of the document holding plate 12 when the tray 42 is pushed down to the document holding plate 12. The tray 42 is held in the collapsed state by the elastic contact and the friction locking force.

Reference numeral 45 (FIG. 3) is a rolling roller arranged on the back side of the document holding plate extension plate portion 12A, which is provided on the upper surface of the document table extension plate portion 4 when the document holding plate 12 is tilted with respect to the document table 2. The original pressing plate 12 is in contact with and supports the weight of the original pressing plate 12.

(4) Sheet Mode Copy This is a case where a sheet document is automatically conveyed by using the DF device A to perform a copy process. In the same manner as described in the item (2)-, the document holding plate 12 is locked to the main body of the copying machine to switch to the sheet mode switching state. The document holding plate 12 is placed on the document table 2 only by tilting it. The sheet document introduction guide tray 42 is raised to an appropriate inclination angle with respect to the sheet document introduction port 40 of the DF device A.

Sheet document _{O S} onto the inclined tray 42 (first-2 view)
Of the tray with the image surface to be copied facing downward and the back side of the original abutting against the inner surface of the guide side wall 42a formed along the back side of the tray 42. Slide down the inclined surface and insert the leading edge of the document from the inlet 40 to D
The document is inserted into the F-apparatus A, and the leading edge of the original is abutted against the contact nip portion between the sheet original feeding roller 30 and the original table 2 to be received.

Then, the copy start button 46 (Fig. 1.5) is pressed. The ON signal is input to the control circuit and the first half forward movement a of the document table 2
Is started. In this case, since the document pressing plate 12 is locked to the main body of the copying machine, the document pressing plate 12 does not move and only the document table 2 moves forward. During the first half of the forward movement of the document table 2, the sheet document feeding roller 3 which is in contact with the document table 2
0 is accompanied not rotated by the forward movement a of the document table 2, but the direction of rotation is the direction opposite to the retraction direction of the sheet document, leading edge of the document O _S is feed sheet document roller 30 and platen 2
The contact nip portion with and is kept in a state of being directly received. The drive roller 32 in contact with the upper surface of the front edge member 3 of the document table 2 and the shaft 31 integral with the drive roller 32 also rotate, but the direction of rotation is a one-way clutch 33.
In the idling direction of a, the rotational force is not transmitted to the timing roller 33 attached to the shaft 31 via the one-way clutch 33a. That is, the paper discharge roller 23 does not rotate.

As soon as the document table 2 reaches the forward movement end position a ', it is turned to the backward movement movement b. FIG. 6 (a) shows a state at the time when the document table 2 reaches the forward movement end position a ', and at this time, the document leading end reference mark M position on the right side of the document table 2 (fifth position).
The figure shows a position substantially corresponding to the longitudinal axis position of the image exposure slit hole 1 which is the image reading portion of the copying machine main body.

When the document table 2 is turned to the backward movement b, the sheet document feeding roller 30 and the drive pickup roller 32 are driven to rotate in the opposite direction to the above case. This by the original _{O S}
In a state where the leading edge is substantially equal to the original front end reference mark M position of the document table 2, and the inner side of the side of the original O _S (tray 4
2 is an edge 2a of the original plate extension plate 4 on the original plate 2 side (FIG. 3 and FIG. 5).
In a state of substantially matching with, the document is clamped between the feeding roller 30 and the surface of the document table 2 and pressed against the surface of the document table 2, and together with the document table 2 at the same speed as the backward movement speed of the document table 2. The document is retracted and conveyed from the tray 42 side in the original moving direction of the document table, and sequentially passes through the position of the image reading unit 1 from the leading edge side.

That is, the original O _S is an image processing apparatus B side of the paper feed timing by the leading edge as described above is conveyed to the image reading portion 1 in a state of being substantially equal to the original front end reference mark M position of the document table right side And the resist match. Further, one-side reference conveyance is performed with the edge portion 2a on the document table 2 side as a reference.

Further, the rotation of the drive take-up roller 32 is transmitted to the shaft 22 through the shaft 31, the one-way clutch 33a, the timing roller 33, the timing belt 34, and the timing roller 28, and the paper discharge roller 23 discharges the sheet original from the discharge port 41 to the DF device A. Is driven to rotate at a peripheral speed substantially the same as the backward movement speed of the document table 2 in the direction of discharging outward.

The distal end side of the document O _S is deflected by the separation member 24 which is in contact with the platen 2 side passes through the image reading portion 1 position scooped up from the platen 2 side to the discharge port 41 direction, the paper discharge roller 23 on the way Receiving the paper ejection force by the rotation of the
Exit from DF device A from 1. Transportation of Ban not above document O _S proceeds to the backward movement b rather subsequent document table 2.
FIG. 6 (b) shows a state in which the document table 2 is being moved back and forth.

And passed through the original O _S is the image reading unit 1 position the rear end until the document table 2 reaches the backward end position b 'end,
In addition, the upper surface of the document pressing plate 12 on the side of the sheet discharge port 41 is used as a tray to completely discharge the sheet from the sheet discharge port 41. Fig. 6
(c) is a diagram of a state in which the document table 2 reaches the backward movement end position b '.

The document table 2 which has reached the backward movement end position b ′ is immediately moved to the second half forward movement a.
Is returned to the first home position and is in a standby state.

Thus, the sheet document O _S in conjunction with the backward movement b of the platen 2 is conveyed automatically to the image reading section 1 located at the same speed as the backward moving speed of the document table 2, the image reading of the document O _S In the process of passing the position of the portion 1, the reading of the original image (in this example, the slit image forming exposure of the original image on the surface of the photosensitive drum 51) is sequentially performed from the front end side to the rear end side of the image, and the copy machine B copies the copy. Creation is done. The original O _S ended readings are automatically discharged to the DF apparatus A out.

(5) Book mode copying This is for copying thick originals such as books. The above
According to the procedure described in the item (2)-, the document holding plate 12 is locked to the document table 2 so that the book mode is set. Since the sheet document introduction guide tray 42 is not used, the sheet document introduction guide tray 42 is laid down and locked on the upper surface of the document pressing plate 12 as shown in FIG.

The document pressing plate 12 and raised to open around a shaft 13 from above the document table 2 upward, placing a thick original O _B to be copied to _(Figure 7) to the image plane down on the document table 2. In this case, the side of the back side of the document O _B is butt on the document table 2 side edges 2a of the platen extending plate section 4 (FIG. 5), the tip sides by mating the original tip reference mark M located Place it. Covered defeat original pressing plate 12 over the placed original O _B. Document pressing plate 12 is covered on the original O _B with a certain degree of thickness so as to cover even almost horizontal state, connected through the shaft 13 in the vertical direction of the long hole 13a as in the fourth illustrated for the slide plate 9 There is.

After setting the manuscript O _B in the manner described above, press the copy start button 46. The ON signal is input to the control circuit, and the first half forward movement a → backward movement b → second half forward movement a of the document table 2 is performed as in the case of the sheet mode copying. However, this movement of the platen 2 is made in a state carrying the set original O _B and the document pressing plate 12 thereon. FIG. 7 shows a state when the document table 2 reaches the forward movement end position a '.
Tip portion of the document O _B At a this state is located in the image reading unit 1 position. The platen 2 is backward b, backward end position b sequentially sequentially passed through the image reading an image reading portion 1 position toward the rear end side from the leading end side original O _B in the course to reach the 'is made The copy machine B makes the copy.

The document table 2 which has reached the backward movement end position b ′ is immediately moved to the second half forward movement a.
After returning to the home position, it returns to the first home position and enters the standby state. Open the document retainer plate 12 from the document table 2 and raise the document O
_Take out _B.

In the case of copying a plurality of sheets of the same original (multi-copy), if the copy start button 46 is pressed after setting the required number of sheets with the numeric keypad 47 (Figs. 1 and 5) in advance, the original table 2 is driven to reciprocate ab. A is continuously executed the set number of times, and the set number of copies is output from the copying machine B.

If it is desired to obtain a plurality copy of the same document for sheet document O _S, it may be copy processing in this book mode copying system.

(6) Inspection and maintenance of DF device A When the knob 14a is set to the neutral switching position N, the first and second locking pieces 14b and 14c of the top 14 are engaged with both the stationary member 66 side and the document table 2 side. Not related to each other, the slide plate 9, that is, the document pressing plate 12 to which the DF device A is assembled
Is freely slidable in the left-right direction with respect to the platen 2 or the copying machine body along the rails 7 and 8 until the slide plate 9 comes off from the rails 7 and 8. By moving 9 to the left or right, the document pressing plate 12 with the DF device A attached thereto can be removed from the copying machine body and the document table 2. Therefore, the inspection and maintenance of the DF device A can be easily performed by the above removal. For simple inspection, etc., screw down 3
It is also possible to remove the cover plate 35, which is 6.36.

(7) Additional description of sheet document peeling member 24 (eighth to eleventh)
The tangent line 24a of the lower edge of the sheet original peeling member 24 to the surface of the original table 2 is a direction c- perpendicular to the reciprocating directions a and b of the original table.
If it is c, the tip end surface of the sheet document O _S is will be abuts at full width at a time to the tip end surface of the member 24, damaging the copy edge by generating a shock to the document, causing displacement of the original It is also possible that there are cases. Therefore, in this example, as shown in FIG. 8, the tangent line 24a between the lower edge of the member 24 and the surface of the document table 2 is at an angle with the direction c--c perpendicular to the document table reciprocating direction a.b. θ is attached. That manuscript _{O S}
An angle θ is provided so that the document 24 can be smoothly abutted against the document 24 and the document can be scooped. In particular, the corner portion 24b, which strikes first, has a larger angle θ '.

As described above, the document 24 is always smoothly and scooped from the surface of the document table 2 by mounting the member 24 at an angle with respect to the line of the end portion of the document so that the document and the member 24 do not collide with the entire width at one time.

Further, if the lower edge portion of the sheet original peeling member 24 is fixedly provided so as to be constantly projected (functional state) from the slit opening 16 to the back surface side of the original pressing plate 12, the sheet lowering edge portion is inadvertently touched. Since there is a possibility of damaging the portion by colliding with or hooking another object, it is usually preferable to keep the housed state retracted inward of the slit opening 16.

10 to 11 show examples of such configurations.

In the example of FIG. 10, when the document holding plate 12 is tilted with respect to the document table 2 with respect to the shaft 70, the document pressing plate 12 is brought into contact with the upper surface of the front edge portion 3 of the document table 2 or the upper surface of the extension plate portion 4 of the document table 2. The lever 72 is fixed, and the lever 72 is always urged to rotate clockwise about the shaft 70 by a spring (not shown). When the document holding plate 12 is opened and raised from the document table 2, the lever 72
Is rotated clockwise by the spring as shown by the chain double-dashed line, and the member 24 is rotated and held in the stored state shown by the chain double-dashed line.
When the document holding plate 12 is pushed down on the document table 2, the lever 7
The lower end portion 2 of the original plate 2 abuts against and is received by the upper surface of the front edge member 3 of the original table 2 or the upper surface of the extension plate portion 4, and the subsequent original document holding plate 12
The shaft 70 rotates counterclockwise due to the fall of the
The lower end of 4 is automatically converted into a functional state in which it touches the surface of the document table 2 as shown by the solid line.

In the example shown in FIG. 11, an electric switch 73 is provided which is turned on when the document holding plate 12 is tilted to the document table 2 and is turned off when the document holding plate 12 is opened and raised. The member 24 is held in the functional state shown by the solid line by rotating it counterclockwise via the lever 74b, and is rotated clockwise by the OFF signal to switch and hold it in the storage state shown by the two-dot chain line. It is a thing.

(8) Another configuration example of the DF device A (FIGS. 12 to 14) In the DF device A of this example, the sheet document feeding roller 30 also serves as a drive take-up roller, and is provided with a sheet document introduction roller 75. The members common to those in the examples of FIGS. 1 to 5 are designated by the common reference numerals, and the description thereof will be omitted.

The shaft 29 of the sheet document feeding roller 30, the shaft 22 of the sheet discharge roller 23, and the shaft 76 of the sheet document introducing roller 75 are all rotatably held in parallel between the front bearing plate 20 and the rear bearing plate 21. There is. The feeding roller 30, the paper discharge roller 23, and the introduction roller 75 are fixedly attached to the respective shafts 29, 22, and 76, and the paper discharge roller 23 and the introduction roller 75 are respectively on the right side and the left side of the slit opening 16. Is always in proper contact with the inclined side wall surfaces 12d and 12e. The feeding roller 30 is in a state in which the lower surface of the document pressing plate 12 is in contact with the surface of the document table 2 when the document pressing plate 12 is tilted over the document table 2.

Reference numerals 77 and 78 respectively denote a first gear and a first timing roller, which are attached to the front end of the sheet original feeding roller shaft 29 via one-way clutches 77a and 78a, and 79 and 80, respectively.
Is a second gear and a second timing roller fixedly attached to the front end portion of the paper discharge roller shaft 22, respectively. 81 and 82 allow the front bearing plate 20 to rotatably support the pin shafts 81a and 82a, respectively. Further, they are a pair of idler gears meshing with each other, one idler gear 81 meshing with the first gear 77, and the other idler gear 82 meshing with the second gear 79. A timing belt 83 is suspended between the first and second timing rollers 78 and 80.

Reference numeral 84 is a third timing roller attached to the rear end of the sheet original feeding roller shaft 29 via a one-way clutch 84a, 85 is a fourth timing roller fixed to the rear end of the sheet original introducing roller shaft 76, 86 Is the third and fourth
Is a timing belt suspended between the timing rollers 84 and 85.

As described above, the sheet original feeding roller 30 has its lower surface brought into contact with the surface of the original table 2 when the original pressing plate 12 is tilted on the original table 2, and the forward movement a and the backward movement b of the original table 2 are performed. It rotates following with. Here, the roller 30 accompanying the forward movement a of the document table 2 and the shaft 2 integral with the roller 30
When the rotation direction X of 9 is forward rotation and conversely the rotation direction Y accompanying the backward movement b is reverse rotation, the one-way clutches 77a, 84 of the first gear 77 and the third timing roller 84.
The a engages with the gear 77 and the roller 84 only when the shaft 29 is in the reverse rotation Y, that is, when the document table 2 is in the backward movement b, and rotates the gear and the roller in the reverse rotation Y integrally with the shaft 29. While the first
Contrary to the above, the one-way clutch 78a of the timing roller 78 rotates the shaft 29 in the forward rotation X, that is, the document table 2 is driven forward.
The roller 77 is engaged with the roller 77 only when
Rotate forward X together with 9.

Therefore, the sheet original introduction roller 75 is held in a stopped state because the rotational force of the shaft 29 in the forward rotation direction X is not transmitted to the third timing roller 84 when the original table 2 is moving forward a. When the document table 2 is in the backward movement b, the rotational force of the shaft 29 in the reverse direction Y is the one-way clutch 84.
a → third timing roller 84 → timing belt 86
→ Transmitted to the shaft 76 via the fourth timing roller 85, the shaft 76 rotates in the same Y direction as the shaft 29, and the sheet document introduction roller 75 rotates in the document pull-in direction. still,
The diameters of the timing rollers 84 and 85 are set so that the rotational peripheral speed of the roller 75 is substantially equal to the backward movement speed of the document table 2.

On the other hand, when the document table 2 is in the forward movement a, the paper discharge roller 23 does not transmit the rotational force of the shaft 29 in the forward rotation direction X to the first timing roller 78, but to the first gear 77. Since it is transmitted, the rotational force is idler gears 81 and 82 →
The second gear 79 is transmitted to the paper discharge roller shaft 22, and the shaft 22
Rotates in the Y direction opposite to the shaft 29, and the roller 23 rotates in the document discharge direction. When the document table 2 is in the backward movement b, the rotational force of the shaft 29 in the reverse direction Y is not transmitted to the first gear 77 contrary to the above, but is transmitted to the first timing roller 78. Therefore, the rotational force is transmitted to the timing belt 83 → the second timing roller 80 → the paper discharge roller shaft 22, the shaft 22 rotates in the same Y direction as the shaft 29, and the roller 23 rotates in the document discharge direction. That is, the discharge roller 23 moves back and forth b even when the document table 2 is moving forward a.
Even when it is being rotated, it is driven to rotate in the document discharge direction in conjunction with any of them. The gear ratio and the like of the power transmission system are set so that the rotation peripheral speed of the discharge roller 23 substantially matches the moving speed of the document table 2.

9 (a) to 9 (e) are document feeding process diagrams at the time of sheet mode copying by the DF apparatus A of this example. In this figure, for simplification, the DF device A shows only the sheet original introduction roller 75, the sheet feeding roller 30, the sheet discharging roller 23, and the peeling member 24.

(a) drawing a quiescent state, its on to the sheet document O _S with the image surface facing down using the top portion of the left side of the document pressing plate 12 than the DF system A portion as a sheet document placing tray placed, and sets a document O _S and the leading edge portion of the document to the state abutting one another contact nip portion between the inclined side wall surface 12d of the document introduction roller 75 and the slit opening 16. It is also possible to perform the above set of original O _S using it of course is provided with a document introduction guide tray 42 dedicated to those of the first to fifth illustrated example.

Then, when the copy start button is pressed, the original table 2 moves forward a in the first half to reach the forward movement end position a '. Figure (b) shows the state at this point. While the document table 2 is moving forward in the first half, the document feeding roller 30 and the discharge roller 23 are rotated in the X direction and the Y direction, respectively, in conjunction with the movement of the document table (Fig. (A)). The document introducing roller 75 does not rotate and is kept in a stopped state. Thus the set original O _S is the set state of the feeding Sarezu beginning is maintained.

When the document table 2 reaches the forward movement end position a ', the document table 2
The position of the reference mark M on the right side of the document is located to the left of the contact portion between the document feeding roller 30 and the surface of the document table 2 by a distance l. This distance l, the contact of the leading edge position of the original O _S which is received by the contact nip portion between the inclined side wall surface 12d of the document introduction roller 75 and the slit opening 16, the document feeding roller 30 and the platen dihedral It is approximately equal to the length of the original transport path to the copy.

The document table 2 which has reached the forward movement end position a'is immediately turned to the backward movement movement b. Along with the backward movement of the document table 2, the document introducing roller 75, the feeding roller 30, and the paper discharging roller 2
All rollers 3 becomes rotated state in the Y-direction, the original O _S a rotational force of the document introduction roller 75 is retracted automatically into the DF system A. When the tip of the retracted original O _S reaches the contact portion between the document feeding roller 30 and the platen 2, platen 2
The position of the reference mark M at the leading edge of the document just reaches the position of the contact portion, and the registration with the sheet feeding timing on the image processing apparatus B side is matched. Figure (c) shows the state at this point.

Same speed addition crowded with backward movement speed of the document table 2 while being pressed against the platen 2 surface and between the original O _S is the feed roller 30 and the platen 2 by the document table 2 of subsequent backward movement b And is conveyed together with the document table 2 and sequentially passes through the position of the image reading unit 1 from the front end side. When the leading end of the document O _S passes through the image reading unit 1 position, with a release member 24 in contact with the platen 2 side are deflected scooped up from the platen surface to the discharge port 41 direction, the discharge roller 23 in the middle The rotation causes the sheet to be discharged, and the sheet exits the DF device A.

Tip of the document O _S between the up document table 2 reaches the backward end point b ', in a state of passing through the image reading unit 1 position bled from the contact portion between the document feeding roller 30 and the platen 2 and which, when the original O _S is small-sized end is further completely discharged to the outside of the DF system a. Original O _S is not Kira completely missing in the large size and is the document table 2 is backward end position b 'to reach the point that the rear end is still outlet within 41 At a when. Figure (d) shows this state.

However, even in such a state, the sheet discharge roller 23 continues to move in the Y direction, that is, the document is discharged, as described above, until the document table 2 is continuously turned to the second half forward movement a and returns to the first home position. since rotates in a direction, the original O _S of large size is also completely fed out to the outside of the DF system a. (e)
The figure shows an intermediate state of the second half forward movement a of the document table 2.

The book mode copying is the same as in the case of the example shown in FIG.

(9) Others The document feeding roller 30 may be an endless belt member that comes into contact with the surface of the document table 2 and is driven to rotate.

Although the DF device A of the embodiment has a document holding plate 12 which is openable and closable with respect to the document table 2 and is incorporated therein as a raising and lowering member, the DF device A of the image processing apparatus having the document holding plate 12 or not. It is also possible to adopt a form in which the DF device A can be independently tilted up and down with respect to the document table 2.

The image processing apparatus B is not limited to the copying machine of the embodiment, but may be an image reading apparatus or a facsimile apparatus having a fixed image pickup element array such as a CCD array as an image reading element.

C. Effect of the Invention The sheet document peeling member of the sheet document feeder of the present invention described above is in a functional state in which the sheet document peeling member is in contact with the document table surface so that the sheet document can be peeled, and a storage state in which the sheet document peeling member is drawn inward of the apparatus and does not contact the document table surface With the movable structure that can be converted to the state, when the apparatus is opened and raised from the document table, it is held in the stored state, so that a hand or another object is inadvertently struck or hooked on the protruding portion. It is prevented that the member is damaged. Moreover,
The function state / storage state of the sheet document peeling member is linked to the up / down movement of the device with respect to the document table, and when the device is folded down against the document table, the function state is changed and held in conjunction therewith, which is more reliable. Is safe.

[Brief description of drawings]

FIG. 1 is a partially cutaway external perspective view of an embodiment of a DF apparatus according to the present invention, FIG. 2 is a vertical sectional front view including an image processing apparatus, and FIG. 3 is a vertical sectional view of a DF apparatus section. The figure is an enlarged cross-sectional view of the mode switching frame, Fig. 5 is a plan view of the DF device with the cover plate removed, and Figs. 6 (a) to 6 (c) are document feeding during sheet mode copying. FIG. 7 is a process diagram, FIG. 7 is a state diagram when the document table reaches the forward end point position in book mode copying, FIG. 8 is a plan view of the sheet document peeling member, and FIGS. (e) is a sheet document feeding process diagram,
10 to 11 are examples of a mechanism for selectively switching the sheet original peeling member between a functional state and a stored state, FIG. 12 is a plan view of a main part of another embodiment of the DF apparatus, and FIG. It is a side view. A is a DF device, B is an image processing device, 1 is an image reading unit,
2 is a reciprocating type document table, 30 is a sheet document feeding roller, 2
3 is the same paper discharge roller, 75 is the same introduction roller, and 24 is a sheet original peeling member.

Claims (1)

[Claims] 1. A raising / lowering member which is locked to a main body of a moving original platen and which can be freely moved up and down with respect to the surface of the original platen. A sheet original feeding member which is in contact with the surface of the original table substantially corresponding to the position of the image reading unit of the image processing apparatus main body and is driven to rotate or rotate in accordance with the movement of the original table; A document introducing port for introducing a sheet document between the surface of the document table and the sheet document feeding member that are in contact with each other; The sheet original that has passed through the image reading section is separated from the surface of the original table by the cooperation of the moving original table and the sheet original feeding member, but when the raising member is opened and raised, the sheet original is inwardly moved. Sheet retracted sheet original separating member and sheet separated from the surface of the original table Composed by comprising: a discharge port for discharging the paper, a sheet original feeding apparatus characterized by.