JPS59201073A - Original feeding device - Google Patents

Abstract

PURPOSE:To make a carrying part light, and to open and close easily an exposing plate by separating a driving source of the carrying part and a control part from the carrying part. CONSTITUTION:An original feeding device 1B is constituted of at least a feeding device 2 and a carrying part 3, and the feeding device 2 is provided on one side part of a copying machine body 1A. This feeding device 2 of paper, etc. feeds out an original thorwn in a laminted state, by one sheet each sucsessively from that of the uppermost layer. The fed-out original is fed to a prescribed position on an original placing platen glass 4 by the carrying part 3 whose one end part is supported pivotally by the back face part of the copying machine body 1A and which is provided so that it can be separated from an exposing plate 4, and fed to an original tray 5 after copying is ended. In this way, a driving source for driving the carrying part, and a control part are provided separately from the carrying part, therefore, the weight of the carrying part is reduced, and the exposing plate can be opened and closed easily.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a device that transports an original to a predetermined position on an exposure table provided in an image forming apparatus main body, and discharges the original from the exposure table after exposure. It is.

"Technical Background of the Invention and its Problems" In this type of conventional apparatus, a conveying section that frictionally conveys the original on the exposure table is rotatably supported on the main body of the image forming apparatus, and can be opened and closed with respect to the exposure table. It is composed of

However, since the drive source and control unit for the transport section are also installed within the transport section, the weight of the transport section increases, and there is a problem in that the transport section cannot be opened and closed smoothly.

[Object of the Invention] The present invention has been made in view of the above circumstances, and provides a document feeder that can reduce the weight of the transport section and that can easily open and close the transport section with respect to the exposure table. The purpose is to provide

[Summary of the Invention] In order to achieve the above-mentioned object, the present invention provides an image forming apparatus which has one end rotatably pivoted to the main body of an image forming apparatus and the other end which is provided so as to be separable from the exposure table so that the document on the exposure table can be read. A transport unit that transports the transport unit, a drive source and a control unit that are fixedly attached to the image forming apparatus main body separately from the transport unit and drive and control the transport unit, and a drive source and a control unit that drive and control the transport unit, and A document feeding device is constructed by providing a power transmission means for transmitting power to a conveying section.

(Margin below) [Embodiments of the invention] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic perspective view of an apparatus according to an embodiment of the present invention applied to a copying machine equipped with an automatic document feeding function. In the figure, 1A is the main body of the copying machine, and a document feeding device 1B is provided on the upper part of the main body of the copying machine. Original feeder 1B
is composed of at least a feeding device 2 and a conveying section 3, and the feeding device 2 is provided on one side of the main body 1A of the copying machine. This paper sheet feeding device (hereinafter also simply referred to as a separating and feeding device) 2 is a device that sequentially feeds paper sheets, such as original documents, input in a stack one by one, starting from the end layer, such as the top layer. . The sent document is transferred to a transport section (one end of which is pivotally supported on the rear surface of the copying machine main body 1A) and which is separable from an exposure table (hereinafter simply referred to as document table glass) 4.
The document is transported to a predetermined position (an exposure position) on a document platen glass 4 by a conveying device (hereinafter also referred to as a conveying device) 3, and after copying of the document is completed, the document is sent to a document tray 5. In the drawing, reference numeral 104 is a document stopping means that stops the document conveyed onto the document table glass 4 at the exposure position against the conveyance force of the conveyance section 3, for example. They are arranged in a direction that intersects the direction. In this way, new documents are sent one after another through the separation and feeding device 2 and are provided for copying. d3. In the separation and feeding device, the configuration of the placement section 6 on which the stacked documents are placed is as follows.

That is, a mounting table 6B forming a part of the bottom surface of a stacking chamber 6A that can accommodate a plurality of originals at once in an inclined state is provided in an inclined state. A pair of side regulating plates 6C are disposed on the vertical side of the mounting table 6B and are slidable in a direction perpendicular to the feeding direction depending on the size of the document. In addition, at the inclined upper end part, when setting the original in the transverse direction, it can be rotated and stored on the mounting table 6B as shown by the solid line in the first figure, and when setting the original in the longitudinal direction, it can be rotated and stored in the first As shown by the two-dot chain line in the figure, a document support member 60 is pivotally mounted and rotated by approximately 150 degrees to constitute an extension of the mounting table 6B.

Here, FIG. 2(a) is a schematic side view showing the internal mechanism of the separating and feeding device 2, and FIG. 2(b) is a partial perspective view.
The outline of the separation and feeding device will be explained based on the following. In the figure, the reference numeral 6B is the first stage mounting table, on which originals P are placed in a stacked state. The placed original P is shown in Figure 2 (a
) A stopper that can swing in the directions of arrows AI and A2 (a positioning and pressing section that regulates the positioning of the paper sheets placed thereon and intermittently presses the stacked paper sheets when the positioning regulation is released) The positioning is controlled by a stopper 10 shown in FIG. 2(a). When rotated in the direction of arrow A1, the document P slides diagonally downward under its own weight. A friction braking member, for example, a urethane rubber sheet 101, is provided on the guide plate 100 via a third mylar guide 15C. (See also Figure 2(b)). When such a urethane rubber sheet 101 is provided, documents that have slipped down in a stacked state are frictionally braked by their own weight, and the entire document does not slide sideways to the left in FIG. 2(a). Thereafter, when the original is rotated in the direction of arrow A2 shown in FIG. A feeding section, for example, a feeding roller 11, is provided to reliably feed the original forward by contacting the edgemost layer of the pressed original.

Further, there is provided a separating/feeding unit 2 which separates the outermost layer of the sent document from other documents and sends it to the other side by the cooperation of the feed roller 11 and the stopper 10. The original sent from the original is brought into contact with a pair of registration rollers '13A and 13'B provided at the front of the original, and after the timing for transporting the original is determined, the original is transported towards the original platen glass 4. It is now possible to do so. In addition, as shown in FIG. 2(a), a first mylar guide 15A is provided in front of the feed roller 11,
The stacked documents can be placed smoothly on the placing table 6B. Further, a second mylar guide 15B is provided above the feed roller 11 to the separation feeding section 12.
is provided, and together with the third Mylar guide 15C, it is possible to smoothly and reliably send the original sent by the feed roller 11 to the separation feeding section 12. In addition, a fourth mylar guide 15D, which is bent in a substantially "R" shape, is provided at the front of the third mylar guide 15C, facing the upper guide 103 (see FIG. 2(b)). (see also).

Therefore, the document taken out and conveyed from the separation feeding section 12 is transferred to the fourth mylar guide 15D and the upper guide 103.
This makes it convex upward, and its tip is guided to the nip portion of the pair of registration rollers 13A and 13B. Note that the tip of the fourth mylar guide 15D (with respect to the document conveyance direction) is not fixed, so that it becomes substantially flat when a pressing force is applied from above.

Next, the apparatus of this embodiment will be explained in detail with reference to FIG. 3 showing the drive system of the separation and feeding apparatus.

The device of this embodiment includes the stopper 10, the feed roller 1
1. Separation feeding section 12 and registration rollers 13A, 13B
A conveyor belt 71, which will be described later, and the like are selectively driven by forward and reverse rotation of one drive source. To do this, first, a drive source, for example, a motor 20 capable of forward and backward rotation in the X1 and Y1 directions shown in the third figure, a first pulley 21A fixed to the motor shaft of this motor 20, and the rotation of the first pulley 21A is transmitted. the second pulley 21B and both pulleys 21A.

a first timing belt 22A stretched over 21B;
A first idle gear 23A that rotates integrally with the second pulley 21B, a second idle gear 23B that meshes with the first idle gear 23A, and a first drive gear 24A that meshes with the second idle gear 23B. , a first shaft 25 that rotates integrally with the first drive gear 24A is provided.
The shaft 25 rotates x2 with respect to rotation of the motor 20 in x1 direction.
direction, and rotates in the Y2 direction in contrast to the Y1 direction rotation. The details of the power transmission system from the motor 20 to the first drive gear 24A are shown in Figure 4 (
The structure is shown in the exploded perspective view and assembled perspective view shown in a) and (b).

At the third right end of the first shaft 25 in the drawing, the Y of the first shaft 25 is
A second drive gear 24B is fixed via a first one-way clutch 26A that transmits rotation in only two directions. Further, a third drive gear 24C to which the rotation of the second drive gear 24B is transmitted, a separation feed shaft 35 that rotates in the third illustrated arrow Y3 direction together with the third drive gear 24C, and a separation feed shaft 3rd fixed to 35
the fourth pulley 210 to which the rotation of the third pulley 21C is transmitted, and both pulleys 210, '21
The second timing belt 22B stretched on D and the fourth timing belt 22B
A take-out roller drive shaft 27 that rotates integrally with the pulley 21D in the direction of arrow Y4 is provided.

Further, a first shaft 25 is located at the third left end of the second shaft 25 in the drawing.
A fifth pulley 21E is fixed via a second one-way clutch 26B that transmits only rotation in the two directions indicated by the third arrow in the figure. Further, a sixth pulley 21F to which the rotation of the fifth pulley 21E is transmitted, and both pulleys 21E, 2
Third timing bells 1 to 22C stretched on the 1st floor,
A second shaft 28 is provided which rotates integrally with the sixth pulley 21F in the three directions indicated by the third arrow. This second axis 28
A fourth drive gear 24D is fixed to the third right end in the figure, and a fifth drive gear 24D is roughly meshed with the fourth drive gear 24D.
A drive gear 24E and a first registration roller shaft 29A that can rotate integrally with the fifth drive gear 24E are provided, and one of the registration rollers 1 explained in FIG.
3A is attached to the first registration roller shaft 29A and is rotatable in the four directions indicated by the third arrow in the figure. As explained in FIG. 2, the other registration roller 13B is attached to a freely rotatable second registration roller shaft 29B (=j
It is pressed against the registration roller 13A located below via a biasing member (not shown).

Further, a seventh pulley 21G is provided at the intermediate portion of the first shaft 25.
1 to which is fixed, an eighth pulley 21H to which the rotation from the seventh pulley 21G is transmitted, and both pulleys 21G, 2
A fourth timing belt 22D stretched around 1H and a third shaft 30 that rotates integrally with the eighth pulley 21H are provided. Note that this third shaft 30 includes a driving shaft 30A that rotates integrally with the eighth pulley 21H, and a driving shaft 30A that rotates integrally with the eighth pulley 21H.
A and a driven shaft 30B are separated from each other, and both shafts 30A and 30B are connected and connected by a clutch 31. Here, the structure of this clutch 31 will be explained based on FIGS. 5(a) and 5(b). That is, the fifth
As shown in Figure (a), a driving boss member 31A is attached to be rotatable together with the driving shaft 30A, and a driven boss member 31B is attached to be rotatable integrally with the driven shaft 30B, and the driving boss member 31A is attached to be rotatable together with the driven shaft 30B. One end of a spring joint 31G is externally fitted onto the spring joint 31G, and the other end of the spring joint 31C is fixedly held to the driven boss member 31B. Further, a sleeve 31D is fitted onto the spring joint 31C, and one end of the sleeve 31D is fixedly attached to one end of the spring joint 31C, and a locking protrusion 31E is provided on the outer periphery of the sleeve 31D. is located. Furthermore, as shown in FIG. 5(b'), near the sleeve 311), there is a base 31F, an intermittent lever 31G swingably provided on the base 31F, and an intermittent lever 31G that is rotated in the direction of arrow C1. The biasing member 311 to bias the intermittent lever 31G in the direction of arrow C against the biasing force of the biasing member 31H.
A clutch engagement/disconnection section 31K is provided, which is constituted by a solenoid 31J that rotates in two directions. In such a latch 31, when the solenoid 31J is demagnetized, the distal end 31G- of the intermittent lever 31G engages with the locking protrusion 31F of the sleeve 31D, and at this time, as shown in FIG. ) Since the rotation of the sleeve 31D shown in ) is restricted, the boss portion 31A- of the driving boss member 31Δ slips on the inner diameter of the spring joint 31G, and the torque of the driving shaft 30A is reduced to the driven shaft 30B.
is not transmitted. Furthermore, when the solenoid 31J is energized, the distal end 31G- of the intermittent lever 31G is disengaged from the locking protrusion 31E of the sleeve 31D, so that the sleeve 31D shown in FIG. 5(a) becomes free at this time. The torque of the driving shaft 30A is transmitted to the driven shaft 30B by the frictional force between the inner diameter portion of the spring joint 31C and the boss portion 31A- of the driving boss member 31A.

Next, the stopper 10 is driven via the first shaft 25, the separating and feeding shaft 35, the take-out roller shaft 27, and the third shaft. The feed roller 11 and the separation feed 12 will be explained in detail. The drive system of this part is the part shown in section 8 of FIG. 3, and corresponds to the part shown in FIG. 2(a).

FIG. 6 is a detailed perspective view of portion J shown in the third figure.

As shown in FIG. 6, the stopper 10 is provided so as to be able to swing slightly (in a direction perpendicular to the sending direction of the original P) via a bin 41 attached to the center of one end of a stopper holding member 40. . This is to uniformly press the document at the tip of the stopper 10.

The other end of the stopper holding member 40 is fixed to a cam lever shaft 42, and a cam lever 4 is attached to the end of the shaft 42.
3 is installed. A biasing member 44 is attached to the cam lever 43, and constantly biases the cam lever shaft 42 to rotate in the direction A2 in the fourth figure. Then, the cam lever 43 is actuated to move the stopper 10 in FIGS. 6 and 2 (a).
), a cam 44 is attached (pull) to the driven shaft 30B of the third shaft 30 as shown in FIG. is shown in Fig. 2 (a > and 6th illustrated arrow AI)
, in the direction of arrow A2, and when it is rotated in the direction of arrow A1, the document P shown in FIG. The back side of P is pressed by the stopper 10 and is pushed diagonally upward.

As shown in FIGS. 3 and 6, the feed roller 11 is a feed roller that is rotatably inserted into an intermediate portion of a pair of arms 50 that are rotatably attached to the take-out roller drive shaft 27. A roller shaft 51 is provided, and is attached to both ends of the feed roller shaft 51 so as to be integrally rotatable. In order to drive the feed roller 11, the third shaft 3
The first drive sprocket 52 is attached to the driven wheel 30B of
A is attached so as to be able to rotate integrally with the feed roller shaft 51, and the feed roller shaft 51 rotates only in the 5 directions indicated by the arrows in FIGS. 3 and 6.
The second drive sprocket 52B is connected to the feed roller shaft 5 via the third one-way clutch 26C.
1, and a first ladder chain 53A is stretched between both sprockets 52A and 52B. However, the feed roller 11 is connected to the driven shaft 30B.
When it is rotated in the 5 directions shown by the arrows in FIGS. 3 and 6, it is rotated in the 6 directions shown by the arrows in FIGS. will be sent to the destination by friction. Since the original is forcibly sent to the other side, it can be reliably sent to the separation and feeding section 12 shown in FIG. 2 <a>.

As shown in FIGS. 3 and 6, the separation feeding section 12 includes a take-out roller shaft 55 rotatably inserted near the free ends of the pair of arms 5o, and both ends of the take-out roller shaft 55. a fourth drive sprocket 52D fixed to the intermediate portion of the take-out roller shaft 55; and a third drive sprocket 52D of the take-out roller shaft 27.
4 and 6, which transmits only the rotation in the direction of arrow Y4 shown in the figure.
Take-out roller shaft 27 via one-way clutch 26D
a third drive sprocket 52C provided in A limited power transmission mechanism 58 that transmits the rotational torque of the feed shaft 35 within a certain range, and a separation roller that is arranged opposite to the take-out roller 56 and to which the torque is transmitted via this limited power transmission 8M4?458. 59. Note that the pair of arms 50 are biased downward in FIG. 6 by a biasing member (not shown), so that the pair of arms 50
9 and is in contact with a certain force.

The limited power transmission mechanism 58 is configured as shown in FIG. A spring joint 62 is positioned on one end surface side of the separation roller shaft 35 and is externally fitted onto the separation roller shaft 35 . One end of the spring joint 62 is fixedly held by a spring support member 63 fixedly attached to the separation roller shaft 35, and the other end of the spring joint 62 is connected to a part of the separation roller boss 61. The cylindrical portion 61a protruding from the side end surface is fitted onto the outside with its inner diameter portion tightened. Then, the axial torque of the separation roller shaft 35 is transmitted to the separation roller boss 61 on which the separation roller 59 is attached by the frictional force between the inner diameter part of the spring joint intro 2 and the outer peripheral surface of the cylindrical part 618 of the separation roller boss 61. It has become. Further, when a certain braking torque is applied to the separation roller boss 61 via the separation roller 59, the cylindrical portion 61a of the separation roller boss 61 slips on the inner diameter portion of the spring joint 62, so that the rotation of the separation roller 59 is restricted. It has become. The separation roller 59 is made of a urethane rubber material with a hardness of 80°, for example, in order to obtain a constant braking force through friction with the original, and has a well-finished surface that prevents dirt and grime from forming over time. It is also able to respond to changes.

Thus, the take-out roller 56 rotates in the direction of the third arrow Y5, and the separation roller 59 rotates in the direction of the third arrow EJJ Y3.
However, when a plurality of documents are stacked and contact the nip portion of both rollers 56 and 59,
The uppermost document is sent forward by the rotation of the take-out row 556, and the document below it is returned in the opposite direction by the rotation of the separation roller 59. Depending on the frictional force between the documents, the limited power transmission mechanism 58 is prevented from slipping. As a result, it is ensured that only the uppermost document is taken out. When the taken out document is being conveyed, the frictional force between the document being conveyed and the separation roller 59 acts as a braking torque sufficient to cause the limited power transmission mechanism 58 to slip, so that the bottom surface of the document is The separation roller 59 will be reversed. Note that while the top layer document is being conveyed, when the document below it is about to enter between the take-out roller 56 and the separation roller 59, the braking torque is released and the separation roller 59 rotates in the Y3 direction in the third figure as described above. and then return it in the opposite direction.

Note that a document detecting section 6 detects whether or not a document is placed on the placing table 6B (see FIG. 1 and FIG. 2(a)).
5 is provided. As shown in FIG. 9, this includes a Rondoro 6 fixed to a frame (not shown), a detection lever 67 rotatably provided on a rod 66, and a detection lever 67 fixed to the driven shaft 30B of the third shaft 30, and the Detection lever 6
7, and a detector 6 that optically detects the presence or absence of the tip 67A of the detection lever 67.
9, when a stacked document is inserted from the direction shown in FIG. It is determined that when there is no original, the tip end 67A of the detection lever 67 shuts off the detector 68, so that it can be determined that there is no original.

Next, the operation of the separating and feeding device 3 will be explained with reference to FIG. 10.

FIG. 10(a) is an explanatory diagram of the state before inputting the original. First, a plurality of documents P are piled up and put into the stacking chamber 6A at once. At this time, the document P placed in the collection chamber 6A is the 10th document P.
As shown in Figure (b), the detection lever 67 is pushed away to disable the detector 68, thereby detecting the presence of paper. The document P placed in the stacking chamber 6A is placed on the loading table 6B by a side regulating plate 6C, a stopper 10 protruding from the inclined lower end of the loading table 6B, and this stopper 10 and this stopper 10.
- The feed roller 11 that comes into contact with the collar holds both ends and the tip of the feed roller 11 in a positioned position on standby.

Next, when a start button (not shown) of the document feeder 1B is pressed, the motor 20 is rotated in the third direction X1 in the drawing, and the solenoid 31J is energized. When the solenoid 31J is energized, the clutch 31 becomes connected as explained in FIGS. 5<a) and (b'), and the motor 2o
The x1 direction rotation is transmitted from the first shaft 25 to the driven shaft 30B via the driving shaft 3°A of the third shaft 3o, and this shaft is rotated in the X5 direction in the third diagram.

Due to this rotation, the first drive sprocket 52
A. Second drive sprocket 52B1 first ladder chain 53A and fourth one-way clutch 26C
The feed roller 11 rotates in the direction X6 shown in the third figure, and the cam 44 attached to the driven shaft 30B rotates, causing the cam lever 43, cam lever shaft 42, etc. Through this, the stopper 10 rotates and descends in the direction of arrow A1 in FIG. 10(C). Then, as shown in FIG. 10 (C'), the document P gradually slides downward diagonally from the top layer. Among the group of originals that have slipped down, the originals that are closer to the loading table 6B (lower-layer originals) have a greater frictional force between their leading edges and the urethane rubber sheet 101; The leading edge of the group of original documents is reliably stepped and frictionally braked. Therefore, it is possible to prevent the entire group of original documents that have fallen down from sliding sideways and the top layer of originals coming into contact with the outer circumferential surface of the take-out roller 56 and the separating roller. It is possible to completely avoid a situation where the uppermost layer of the document cannot be bitten into the contact portion with 59. When the cam 44 is roughly rotated, the header 10 is rotated in the direction of the arrow A2 in FIG. 10(d) following the return stroke of the cam curve of the cam 44, and the uppermost document P is fed. Press it against the roller 11. The document pressed against the feed roller 11, that is, the top layer document, is transferred to the take-out roller 5 by the feed roller 11, which rotates in the direction of arrow x6 in FIG. 10 (0').
6 and the separation roller 59. This operation is performed during one rotation of the driven shaft 30B, and as the driven shaft 30B rotates once, the same operation as shown in FIGS. 10(C) and 10(d) is performed. (Fig. 10(e), (f)). As a result, the document on the top layer is always placed before the document located below it by the take-out roller 5.
6 and the separation roller 59.

When this biting operation is completed, the motor 20
is reversed and rotates in the direction of the third arrow Y1 in the figure. Then, the first shaft 25, first one-way clutch 26A, separation feeding shaft 35, take-out roller drive shaft 27, and fourth
The take-out roller 56 rotates at a low speed of about 10 mm/sea in the direction of arrow Y5 in FIG. The action of the rotating separation and feeding shaft 35 and the limited power transmission mechanism 58 attempts to rotate the separation roller 59 in the opposite direction to the document feeding direction. At this time, as shown in FIG. 10(h), at the moment when the uppermost document P1 or the original IPx in the vicinity thereof is not completely bitten by the contact portion between the take-out roller 56 and the separation roller 59, the take-out roller 56 is The frictional rotational force transmitted to the spring joint 62 is shown in FIG. 8(a).
The take-out roller 56 rotates in the forward direction as a driving roller, and the separation roller 59 rotates in the forward direction as a driven roller, exceeding the reverse friction rotational force of the separation roller 59 transmitted through the separation roller 59. If this operation continues, the outer periphery of the take-out roller 56 made of natural rubber material with a large coefficient of friction will ensure that the document P1 or px is brought into contact with the take-out roller 56 and the separation roller 59 as shown in FIG. 10(i). Invite. Note that due to the difference in frictional resistance, the separation roller 59 rotates in the direction to take out the original when one sheet is taken out, and in the direction to return the original when two or more sheets are taken out. And Figure 10 (0)
As shown in , if one sheet is reliably taken out by the cooperative action of the two pairs of rollers, it is fed a predetermined m by the action of the take-out roller 56, and the fourth
Due to the joint action of the mylar guide 1°5D and the upper guide 103, the document P is made to have an upwardly convex shape, and its tip is guided toward the contact portion of the pair of registration rollers 13A and 13B, as shown in FIG. As shown in (j), the leading edge of the document P is bitten by the contact portion of the registration rollers 13A, 13B, and the document is waved between the take-out roller 56 and the registration rollers 13A, 13B, so that the leading edge misalignment is corrected. The motor 20 is temporarily stopped.

Here, regarding the document feeding and separating functions between the take-out roller 56 and the separating roller 59, FIGS. 10(k) and (1)
) will be further explained in detail. Ideally, as the stopper 10 descends, the uppermost document on the placement guide 6B is bitten into the contact portion between the take-out roller 56 and the separation roller 59. However, if you mix manuscripts of different paper quality,
Furthermore, there is no guarantee that the documents will be ideally separated in a stepwise manner (the document located below the top document will be separated by the take-out roller 5).
6 and the separation row 559 may bite on an extremely rare occasion).

As described above, forced separation is performed by the action of the take-out roller 56 and separation roller 59, which are activated with a time delay. In reality, the moment two or more originals are caught in the contact portion of both rollers 56 and 59 in any form, the friction conveying force that is transmitted by the take-out roller 56 to the uppermost original PX1, the uppermost original PX1. PX2 and PX2 (or PX3) are frictionally conveyed under the conveying force of
The conveyance force is transmitted to the upper surface of the document PR in contact with the separation roller 59 as a friction conveyance horn. But on the other hand, the 8th
The separation roller 59 is stronger than the frictional conveying force between the originals received from the separating roller 59, which is transmitted through the spring joint 62 shown in FIG. This can be achieved by setting a large value for the frictional conveyance value transmitted to the PR. Therefore, the manuscript P,
R is returned toward the mounting table 6B by the action of the separation roller 59, and the originals PX1, PX2 (PX3
') advances in the take-out direction by the action of the take-out roller 59. Here, it is assumed that the reverse circumferential speed VR of the separation roller 59 is set to approximately three times VF with respect to the circumferential speed VF of the take-out roller 56, and that the document PX1 in contact with the take-out roller advances 10 m+ from the multi-feed state. Then, the document PR that is in contact with the separation roller 56 is returned approximately 30 mm. However, if the distance 1 (not shown) from the contact point between the take-out roller 56 and the separation roller 59 to the leading edge of the original PR at the moment when separation starts is 30 m111 or less (X), the return amount of l-X is The amount of return is transmitted to the document PX2 (or PX3) located above PR, and the amount is returned instantly. This is repeated to perform the separation action, and the document PX1 comes into contact with the lower surface of the document PX1 that is in contact with the take-out roller 56. The separation roller 59 continues to try to push back the document on PX 1, but a spring joint 62 shown in FIG. 8(a) is interposed between the separation roller 59 and the separation roller shaft 35. The upper surface of the document PX1 receives a friction conveying force in the take-out direction from the take-out roller 56, while the lower surface of the document PXI receives the force of the separation roller 59, which receives a friction driving force via a spring joint 62. Since the frictional conveying force transmitted by the take-out roller 56 to the upper surface of the document PX1 is much larger than the frictional force transmitted from the spring joint 62 to the separation roller 59, the document PX1 is taken out and conveyed as the take-out roller 56 rotates. Here, the bottom surface of the document PX1 is separated by the separation roller 56.
Since the frictional rotational force transmitted from the spring joint 62 to the separation roller 59 is greater than the frictional rotational force transmitted from the spring joint 62 to the separation roller 59, the original P
The lower surface of X1 does not slip against the separation roller 59, and in cooperation with the take-out roller 56, only the uppermost document PX1 is reliably separated from the roller contact portion and taken out and conveyed.

Next, the document separation ability of the take-out roller 56 and the separation roller 59 will be explained based on FIG. 10 (1). The take-out roller 56 and the separation roller 5 in a state immediately before starting separation
A pair of registration rollers 13A located in front of the contact portion of No. 9 in the conveyance direction.

The distance to the contact part of 13B is 1. The distance from the tip of the document table that is caught in the contact area between the take-out roller 56 and the separation roller 59 in a multi-feed state to the contact area of both rollers 56 and 59 is 11, 12, 13...the circumference of the IR1 take-out roller 56. The speed is VF, the circumferential speed of the separation roller 59 is VR, and 3VF.
If we temporarily set = VR, then 3(L-11) >12+13
+... Separation action is performed within the range that satisfies the IR.

The originals that have been completely separated and fed are shown in Figure 10.
j) as described based on the registration roller 13A.
, 13B and is waved, and the motor 20 is temporarily stopped. After a predetermined period of time has elapsed, the motor 20 is rotated in the direction of the third arrow x1, and as a result, the first shaft 25. Second one-way clutch 26B, third timing belt 22C1 second shaft 28,
A pair of registration rollers 13A and 13B are rotated via fourth and fifth drive gears 24D and 24E and first and second registration roller shafts 29A and 298, and the document is shown in FIG. 10(m). In this way, it is transported toward the above-mentioned transport device 3 in accordance with a predetermined timing such as image processing.

Note that if a document jam occurs while the take-out roller 56 and the separation roller 59 are in contact with each other, the arm 50 is automatically deflected by operating a roller contact release means (not shown) to break the contact and easily remove the document. Mounting table 6B
It is possible to pull it out towards. At this time, the mounting table 6B
Although there is one or more originals P on top, the contact between both rollers 56 and 59 has been cut off, and the originals cannot be separated and fed.

Next, the conveyance device 3 will be explained. In FIG. 3, the reference numeral 3 schematically shows the drive system of the transport device, and FIG. 11 is a schematic side cross-section of the transport device, etc.

This conveyance device includes a pair of belt rollers 70A, 70B, an endless conveyor belt 71 that is stretched between both belt rollers 70A, 70B, and slides and conveys the original on the document table glass 4 by frictional force. a plurality of suppressing means 109 disposed on the inner diameter side of the document table glass 4 and applying pressure to the conveyor belt 71; and the belt roller 70A.
A power intermittent device 72 for intermittent power transmission to and from the belt roller 70B, and a discharge roller 73 driven by power from the belt roller 70B.

In addition, near the tip of the document table glass 4 along the document conveyance direction, as described above, the document conveyed onto the document table glass 4 is stopped at the exposure position against the conveyance force of the conveyance device 3, for example. Document stopping means 104 is arranged so as to be adjustable in position and intersect with the document conveyance direction. In this conveyance device 3, the conveyance belt 71, which rotates in the direction of the arrow ×3, is driven in the direction of the third arrow ×7 by the rotation of the motor 20 in the direction of the third arrow ×1, and the registration roller 13A.

The original sent out at 13B is slid and conveyed on the original platen glass 4 shown in FIG. 11, brought into contact with the original stopping means 104, and stopped at the exposure position. After the copying of the original is completed, the original is conveyed again and discharged onto the original tray 5.

Here, details of the pressing means 109 will be explained. For example, in the pressing force means 109, a pressure roller 109A is rotatably arranged on the inner diameter side of the conveyor belt 71, and a shaft (not shown) of each pressure roller 109A is biased by a biasing member such as a plate spring (not shown). Pressure is applied to the conveyor belt 71 toward the surface of the document table glass 4. By providing such a pressing means 109, it becomes possible to smoothly slide and convey the original on the original platen glass 4. In particular, even after the original contacts the original stopping means 104, the transporting force is applied to the original by the transport belt 71, and the pushing is aligned so that the entire leading edge of the original comes into contact with the original stopping means 104. Therefore, the pressure roller 109A located at the front (front in the conveyance direction) of the document, which is likely to cause waves during alignment, is not shown in the figure so that a larger pressing force is applied than the other pressure rollers. Said ``A''
force member is selected. Therefore, the tension is particularly increased in the portion of the conveyor belt 71 near the document stopping means 104 to prevent the document from waving, and to ensure that distortion-free image information is obtained from the document during exposure in the copying machine main body 1A. becomes possible. In addition, the pressure roller 109A and a force member (not shown) are specially arranged to have four pressure parts on the conveyor belt 71 at predetermined intervals along the direction intersecting the document feeding direction. By configuring the suppressing means 109, it is possible to obtain a frictional conveyance force that can ensure an appropriate conveyance speed for the document, and a conveyance force strong enough to easily cause waves in the document can be applied to the document. This makes it possible to achieve high reliability at low cost.Furthermore, the pressure is applied to the conveyor belt 71 so as to have four rows of pressurizing parts at predetermined intervals along the document feeding direction. By configuring the suppressing means by specially arranging the row 5109A and a biasing member (not shown), it is possible to improve the linear conveyance of the document with a simple structure.

Next, details of the power interrupting device 72 will be explained with reference to FIG. 12 as well.

This power intermittent device 72 is connected to the second shaft 28 (motor) shown in FIG. (This is an example of a drive unit 81 in which a drive system from 20 to the second shaft 28 is fixedly arranged with respect to the sheet conveyance surface.)
When the transmission of rotation is cut off and the conveying device 3 is rotated in the direction of the first arrow E in the figure, so that the document table glass 4 and the conveying belt 71 are in contact with each other, the rotation of the second shaft 28 shown in FIG. It is placed in a standby state where it can be transmitted. That is, as shown in FIG. 12, the power intermittent drive gear (hereinafter simply referred to as the sixth
(also referred to as a drive gear) 24F, a holder arm 75 rotatably attached to the second @ 28, a biasing member 76 for rotationally biasing the holder arm 75 in the direction indicated by the arrow in the twelfth figure, and a rotationally biasing a stopper 77 that engages with the holder arm 75 and locks it at a predetermined position (restricts rotation); and a stopper 77 that is rotatably supported by the boulder arm 75 and meshes with the sixth drive gear 24F. a first pitch circle having an outer diameter approximately equal to the pitch circle diameter of the idle gear 78 and a rotation center axis that is the same as that of the idle gear 78; The disk 107 is attached to the roller @70A' of the roller 70A and can come into contact with and separate from the idle gear 78, and the direction of the line of action of the force acting on the idle gear 78 from the sixth drive gear 24F is the center of rotation. and the rotation center of the sixth drive gear 24F. Consisting of a second pitch circle disk 108 that has an outer diameter approximately equal to the pitch circle diameter of the driven gear, has the same rotation center axis as that of the driven gear, and is capable of rolling contact with the first pitch circle disk 107. has been done.

Therefore, when the conveyor belt 71 and the document table glass 4 are in contact (the state shown in FIG. 12), the rotation of the second shaft 28 is transmitted to the sixth drive gear 24F, and the idle gear 78 is rotated. It is rotated in the direction of the arrow in the figure. By the way, the seventh
The position and rotational direction of the idle gear 78 with respect to the seventh drive gear 24G are set in such a direction that the rotation of the idle gear 78 bites into the seventh drive gear 24G and obtains a component force as described above. Therefore, since the conveyance device 3 can be moved away from the document table glass 4 for m distances, when the conveyance device is closed and the conveyance belt 71 and the document table glass 4 are about to come into contact with each other, the idle gear 78 There are cases where the peak of the seventh drive gear 24G meets the peak of the seventh drive gear 24G and transmission of power becomes impossible at that point.
The drive gear 24G and the idle gear 78 momentarily mesh at the peaks and valleys, and the drive system is completely connected.

Then, the idle gear 78 and the seventh drive gear 24G
When the two mesh with each other, the first pitch circle disc 1
07 and the second pitch circle disk 108 contact each other at their outer peripheries so as to be able to roll and come into contact with each other.

Therefore, the idle gear 78 and the seventh drive gear 2
The center-to-center distance with 4G is regulated by both discs 107 and 108, and both gears can perform ideal meshing rotation as if rolling in contact with each other in the pitch circle, preventing noise and vibration during power transmission. Uneven wear of both gears can be prevented. Note that especially when such a configuration is applied to a gear with low precision, it is possible to prevent noise and vibration caused by the low precision of the gear. Then, the rotation of the seventh drive gear 24G is transmitted to the O-rough 0A,
The conveyor belt 71 is
The original is conveyed by friction between the lower surface of the document platen glass 4 and the upper surface of the original platen glass 4. In addition, the document table glass 4 and the conveyor belt 7
1, or when placing the original directly on the document table glass 4 without using the separation/feeding device 2, move the conveyance device 3 in the direction of arrow F as shown in FIG. Rotate to open. Then, the seventh drive gear 24G separates from the idle gear 78, and the holder arm 75 engages the biasing member 76.
is urged to rotate in the direction of the eleventh arrow shown in the figure, and when it has rotated by a predetermined amount, the rotation is restricted by the stopper 77. In such a state, even if the motor 20 is driven, the conveyor belt 71 will not rotate, so the safety of the work (cleaning the conveyor belt 71, removing jammed documents, manually setting the document) is ensured. be done.

Next, the details of the document stopping means 104 are shown in FIG. 13 (a>,
This will be explained with reference also to (b). 104 in each figure
The one shown by A has a step at one end in the transverse direction, and a drive shaft 104B bent into an approximately L shape is attached to the other end with both ends protruding, and the drive shaft 104B is conveyed on the document table glass 4. This is a stop plate that comes into contact with an incoming document and stops it at the exposure position. and the drive shaft 1
The first protrusion 104Ba of the drive shaft 104B is loosely fitted to the first stop holder 104C, the second protrusion 104Bb of the drive shaft 104B is loosely fitted to the second stop holder 104D, and the stop plate 104A is loosely fitted to the first stop holder 104C. It is rotatable relative to the In this state, the first stop holder 104C is movable in the document conveyance direction, for example, the long hole 104C
The second stop holder 104D is attached to the upper surface of the copying machine main body 1A with screws via the stop plate 1A.
104A is a second stop holder 104 with arrows α 1 and α 2 not shown in FIG.
It is configured such that it can be rotated in the direction and the exposure position can be adjusted. Note that both the stop holders 104C and 104
D also has the function of positioning the document table glass 4 by pressing the end surface of the document table glass 4 and the upper surface in the vicinity thereof with its leading end. Further, as shown in FIG. 3(b), a tension coil spring 104F is attached to the middle part of the L-shaped bent part 104BC of the drive shaft 104B, and a plunger 1 of the plunger type solenoid 104F is attached to the end part.
04F= is connected, and is configured to be rotatable about the drive shaft 104B in the directions of arrows β1 and β2 shown in FIG. 13(b). By configuring the document stopping means 104 in this way, when adjusting the exposure position of the document according to the characteristics of the copying machine main body, it is possible to adjust the exposure position of the document while comparing the position of the actual copy image with respect to the copy paper. Therefore, the adjustment work is extremely easy and can contribute to higher quality image formation. After the exposure of the original document is completed, the plunger type solenoid 104F is energized and the stop plate 104A is rotated in the direction β1 shown in FIG.

As is clear from the above description of the separation/feeding device 2 and the conveyance device 3, the document feeder constituted by these includes a drive source (motor) 20 (see FIG. 3) that drives the conveyance section 3. ) and a control section 120 (see FIG. 11) that controls the drive of the conveying section are provided separately from the conveying device 3, so that the conveying device 3 is extremely lightweight. The device can be opened with great ease when opening in the direction of the first arrow F shown in the figure.

Note that the above-mentioned embodiments are merely examples, and within the scope of the gist of the present invention.
It goes without saying that various modifications are possible.

[Effects of the Invention] As is clear from the above description, in the document feeding device of the present invention, the drive source that drives the transport section and the control section that controls the transport section are provided separately from the transport section. Therefore, the weight of the transport section can be reduced, and the transport section can be easily opened and closed relative to the exposure table, which has excellent effects.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of a device according to an embodiment of the present invention applied to a copying tray equipped with an automatic document feeding function, and FIG. 2 is a schematic side view showing the internal mechanism of the paper sheet separation and feeding device. FIG. 3 is an explanatory diagram showing the drive system of the paper sheet separation and feeding device and the paper sheet conveyance device, and FIGS. 4(a) and (b)
FIG. 5(a) is an exploded perspective view showing a part of the drive system; FIG. 5(a) is an assembled perspective view; (b) is an exploded perspective view of the clutch, an exploded perspective view of the clutch disengagement section, Figure 6 is a detailed perspective view of the J section shown in Figure 3, Figure 7
The figure is a schematic perspective view of the vicinity of the cam lever, and Figures 8(a) and 8(b)
) is an exploded perspective view of the limited power transmission mechanism.
The figure is a schematic perspective view of the document detection unit, and Figures 10(a) to (I)
ll) is an explanatory diagram of the operation of the separation and feeding device, FIG. 11 is a schematic side sectional view of the conveyance device, etc., FIG. 12 is a schematic perspective view of the power interrupter, and FIGS. 13(a) and (b) are document stoppages. FIG. 1 is an exploded perspective view of an assembled perspective view of the means. 1A...Image forming apparatus main body, 1B...Document feeder, 3...Transport unit, 4...Exposure table, 20...Drive source, 24F...Drive gear for power intermittent, 24G. ... Driven gear for power intermittent, 71... Conveyor belt, 72... Power transmission means (power intermittent device), 78... Intermediate gear for power intermittent, 107... First pitch circle disk,
108...Second pinch circle disc, 109.
...Pushing means, 120...Control unit Fig. 2 (0) Fig. 2 (b) 00 24A Fig. 5 (0) 0B 0A Fig. 8 35

Claims (6)

[Claims] (1) In a device that transports a supplied original to a predetermined position on an exposure table provided in the image forming apparatus main body, and then discharges the original from the exposure table after exposure, one end is rotated to the image forming apparatus main body. a conveyance section which is pivotably supported and whose other end is provided so as to be separated from the exposure table, and which conveys the document on the exposure table; A document feeding device comprising: a drive source and a control section that drive and control a transport section; and a power transmission means that transmits power from the drive source to the transport section. (2) The conveyance section includes an endless conveyor belt that slides and conveys the original on the exposure table using frictional force, and a suppressing means that is arranged on the inner diameter side of the conveyor belt and applies pressure to the conveyor belt toward the exposure table. A document feeding device according to claim 1, comprising: (3) A plurality of the pressing means are arranged along the document feeding direction, and the pressing means having the highest force in the document feeding direction has a larger pressing force than the other pressing means. Document feeder. (4) The pressing means is arranged to have four rows of pressing portions on the conveyor belt at predetermined intervals along the document feeding direction. document feeder. (5) The pressing means is arranged to have four pressing portions against the conveyor belt at predetermined intervals along a direction perpendicular to the direction in which the document is fed. The document feeding device according to any one of Items 4 to 4. (6) The power transmission means includes a power intermittent drive gear to which power from the drive source is transmitted, a power intermittent intermediate gear that meshes with the power intermittent drive gear, and a pitch of the power intermittent intermediate gear. A first having an outer diameter approximately equal to the circular diameter and having a rotation center axis that is the same as that of the rotation center axis.
The pitch circle disk is provided in the conveying section and is capable of coming into contact with and separating from the power intermittent intermediate gear, and the direction of the line of action of the force acting from the power intermittent drive gear to the power intermittent intermediate gear is aligned with the center of rotation. A drive gear for power intermittent disposed in a direction intersecting a line segment connecting the center of rotation of the drive gear for power intermittent, and a driven gear for power intermittent having an outer diameter approximately equal to the pitch circle diameter of the driven gear for power intermittent, and the center of rotation thereof. A document feeder according to claim 1, further comprising a second pitch circle disk having a rotational center axis that is the same as the axis, and in which power to the transporting section is cut off when the transporting section is separated from the exposure table. Device.