JP2003095480A - Document carrying device and image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a document, etc., under an actuator from being torn by the actuator when closing an opening/closing cover without damaging the actuator installed when opening the cover. SOLUTION: This document carrying device has a paper feeding tray 201 for setting the document d, a feeding means for delivering the document d set to the paper feeding tray 201, the openable/closable opening/closing cover 162 located on an upper part of the feeding means, the actuator 160 installed in the opening/closing cover 162 and operated by the document d set to the paper feeding tray 201, and a sensor S60 for detecting the document d by the operation of the actuator 160. The opening/closing cover 162 is provided with a regulation means 173 for regulating movement of the actuator 160. The regulation means 173 enables the actuator 160 to detect the document d by the sensor S60 when closing the cover 162 and stays the actuator 160 at a prescribed portion of the opening/closing cover 162 when opening the cover 162.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention conveys an original document for forming an image by an image forming apparatus such as an electrophotographic copying machine, a printer, a facsimile, and a multifunction peripheral or a printing machine having a plurality of functions of these. The present invention relates to a document conveying device and an image forming device that can read an image.

[0002]

2. Description of the Related Art In a document feeder provided in such a digital image forming apparatus, the documents stacked on a sheet feeding tray are separated and conveyed one by one, and both sides of the document can be read by a reading section. There is something like this.

As such an original conveying apparatus, as shown in FIG. 15, the originals stacked on the sheet feeding tray 100 are separated one by one by a separating mechanism 101, and the originals are aligned and conveyed by a registration mechanism 102. When reading one side of a document, the reading unit 103 discharges the sheet to the reading and discharging tray 105, and when reading both sides of the document, the switching gates 106a and 106b feed the sheet to the reversing unit 107 to invert the sheet. 10
By switching 6c, one side of the document is read by the reading unit 103 and sent again to the reversing unit 107 to be inverted, and the other side of the document is sent to the reading unit 103, and the reading unit 103 reads and discharges the discharge tray 10.
There is a sheet to be discharged in 5.

In this document feeder, a photointerrupter type sensor S50 as a detection means for detecting the document set on the paper tray 100, and an actuator 120 for separating the sensor S50 from the presence or absence of the document are separated. Further, a photo interrupter type sensor S51 and an actuator 130 are provided on the downstream side of the reading unit 103 as detection means for detecting the discharge of the document.

[0005]

When the actuator for detecting the original set on the paper feeding tray is attached to the openable / closable opening / closing cover as described above, if the cover is opened when the original is jammed, The actuator could be exposed and damaged.

Further, when the opening / closing cover is closed from the open state, the opening / closing cover is closed in a state where the actuator hangs downward due to its own weight. Therefore, if a document remains under the actuator, the remaining document may be broken. There was also.

The present invention has been made in view of the above points, and an original document conveying device in which an actuator installed when the cover is opened is not damaged and an original document under the actuator is not broken by the actuator when the opening / closing cover is closed. Another object of the present invention is to provide an image forming apparatus.

[0008]

In order to solve the above-mentioned problems and to achieve the object, the present invention has the following constitution.

According to the first aspect of the present invention, there is provided "a paper feeding tray for setting a document, a feeding means for feeding the document set on the paper feeding tray, and an openable / closable opening located above the feeding means. In an original conveying apparatus having a cover, an actuator installed on the open / close cover and operated by an original set on the paper tray, and a sensor for detecting the original by the operation of the actuator, a movement of the actuator on the open / close cover is provided. Characterized in that the regulating means is configured such that when the cover is closed, the actuator can detect a document by the sensor, and when the cover is opened, the actuator stays at a predetermined position of the open / close cover. Document transport device. ].

According to the first aspect of the present invention, even if the opening / closing cover is opened at the time of processing the original jam,
By storing the actuator in a fixed position when the cover is opened, damage to the actuator can be prevented. Also, even if the document under the actuator remains when the cover is closed, it will not break. Furthermore, since the restricting means restricts the movement of the actuator, the cost is low.

The invention according to claim 2 provides the "claim 1
An image forming apparatus comprising the document feeding device according to the item 1. ].

According to the second aspect of the present invention, even if the opening / closing cover is opened when the document is jammed,
The actuator installed on the open / close cover will not be damaged. Further, even when there is a document under the actuator when the opening / closing cover is closed, the document is not broken by the actuator.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of an image forming apparatus equipped with a document feeder of the present invention will be described with reference to the drawings, but the present invention is not limited to this embodiment.

FIG. 1 is an overall configuration diagram of an image forming apparatus 1 equipped with a sheet post-processing device FS, a document feeding device DF, and an image reading device (scanner) SC.

The illustrated image forming apparatus main body 1A includes an image processing section 2, an image writing section 3, an image forming section 4, a high voltage power source section 5, a cassette sheet feeding section 6, a fixing device 7, a sheet discharging section 8 and an automatic two-sided copy. Re-transporting means (ADU) 9 for

An image reading device SC and a document feeding device DF are mounted on the upper portion of the image forming apparatus main body 1A.
A sheet post-processing device FS is connected to the sheet discharge unit 8 side in the upper left portion of the image forming apparatus body 1A shown in the figure.

A document d placed on the document table of the document feeder DF with its first side facing upward is conveyed in the direction of the arrow and one side or both sides of the document are read by the optical system of the image reading device SC. And is read by the CCD image sensor C1.

The analog signal photoelectrically converted by the CCD image sensor C1 is subjected to analog processing, A / D conversion, shading correction, image compression processing, etc. in the image processing section 2 and then sent to the image writing section 3. .

In the image writing section 3, the output light from the semiconductor laser is applied to the photosensitive drum 4A of the image forming section 4 to form a latent image. In the image forming section 4, processing such as charging, exposure, development, transfer, separation and cleaning is performed, and the image is transferred onto the sheet S conveyed from the cassette sheet feeding section 6. The sheet S carrying the image is fixed by the fixing device 7, and is sent from the paper output unit 8 to the sheet post-processing device FS. Alternatively, the single-sided image-processed sheet S sent to the re-conveying unit 9 by the sheet discharge path switching plate 8A is subjected to double-sided image processing again in the image forming section 4, and then the sheet discharge section 8 is formed.
It is sent to the sheet post-processing device FS by the sheet discharge roller 8B.

The sheet post-processing device FS is detachably attached to the upper left portion of the image forming apparatus body 1A. The sheet post-processing device FS includes a sheet conveying unit 10, a sheet discharging unit 20, a post-processing unit 30, and an elevating and discharging unit 40, which are arranged in the sheet post-processing device body 45.

In FIG. 1, on the right side in the main body 1A of the image forming apparatus, the cassette sheet feeding section 6 is located below the image forming apparatus main body 1A in the height direction with the image forming section 4 as the center, and the fixing device is located above the fixing apparatus. 7 and a paper discharge unit 8 are provided. With this vertical arrangement, a substantially vertical sheet conveyance path is formed. The paper S delivered from the cassette paper supply unit 6 is conveyed along the vertically upper paper conveyance path and is discharged to the outside of the image forming apparatus main body 1A.

A sheet conveying path by the re-conveying means 9 is formed substantially parallel to the vertical sheet conveying path.

By forming the above-described vertical paper transport path, the shortest paper transport path from the cassette paper feed unit 6 to the paper discharge unit 8 is formed.

The sheet conveying means 10 of the sheet post-processing apparatus FS is housed in the space above the image forming apparatus main body 1A shown in the figure. The sheet entrance portion 11 of the sheet conveying means 10 is connected to the sheet ejection roller 8B of the sheet ejection section 8 of the image forming apparatus main body 1A. Further, in this mounted state, the sheet discharging unit 20 of the sheet post-processing apparatus FS is provided in the space portion on the upper left side of the image forming apparatus body 1A in the figure.
And the post-processing means 30 is accommodated. The elevating and ejecting means 40 including a plurality of ejection trays (also referred to as bins) 41 and elevating and lowering drive means 42 is located on the left side of the post-processing means 30 in the figure.

Next, the document feeder will be described with reference to FIGS. 2 is a cross-sectional view of the original document conveying device, FIG. 3 is a plan view of the original document conveying device, FIG. 4 is an enlarged sectional view of a main part of the original document conveying device, FIG. 5 is an enlarged view of a switching portion, and FIG. 6 shows a drive system. FIG. 8 is a side view, FIG. 7 is a plan view showing a drive system of the delivery roller, and FIG.
9 is a plan view showing the drive system of the reversing roller, FIG. 9 is a view showing the arrangement of the sensors and actuators of the document feeding portion, FIG. 10 is a view showing a state in which the open / close cover is open, and FIG. 11 is a state in which the open / close cover is closed. 1 is a diagram showing the actuator of FIG. 1, FIG. 12 is a diagram showing the actuator with the opening / closing cover opened, and FIG.
3 is a diagram showing a single-sided sheet feeding path, and FIG. 14 is a diagram showing a double-sided sheet feeding path.

The document feeder DF includes a document feeder 20.
0, a document discharge unit 300, and a document transport unit 400 are arranged.

The document feeding section 200 has a sheet feeding tray 201 on which a plurality of documents can be set, and a pair of regulating plates 202 for positioning the document in the sheet width direction are movable in the sheet width direction. It is provided in. Further, on the paper feed tray 201, sensors constituting the document size detecting means S11, S12 for detecting the size of the placed document are arranged at two places, and the document size is set when the documents having the same size are read. Detect.

The document discharge section 300 has a discharge tray 301, and this discharge tray 301 is arranged below the document feed section 200. The document transport unit 400 is placed on the discharge tray 301.
The document that has been conveyed so that one side can be read or that has been conveyed so that both sides can be read is ejected.

The document conveying section 400 includes a first conveying path 410 on the upstream side, a second conveying path 420 and a third conveying path branched on the downstream side.
It has a transport path 430 and a discharge section 440.

A movable original pressing plate 520, a sending roller 412, and a separating roller 413 are arranged in the first conveying path 410. The separation roller 413 includes a double feed prevention roller 90.
0 is pressed, and the multi-feed preventing roller 900 becomes the separating roller 41.
It rotates following the rotation of 3.

The movable original pressing plate 520 is raised at every sheet feeding to press the original against the sending roller 412 and the separating roller 41.
A feeding unit that presses the original document 3 and separates and conveys the original document one by one by the separation roller 413, and sends out the original document set in the paper feed tray 201 by the delivery roller 412, the separation roller 413, and the double feed prevention roller 900. Make up.

Further, on the downstream side of the separation roller 413, a sensor which constitutes the document length detecting means S21 is arranged, and further, a registration roller 414 for correcting the timing and bending of the fed document is arranged. .

A document reading section 42 is provided in the second transport path 420.
A pre-reading roller 421 that conveys the document to the second position, a reading roller 423 that holds the document by the reading unit 422, and a post-reading roller 424 that guides the read document to the discharge unit 440 are arranged.

On the downstream side of the pre-reading roller 421, a sensor constituting the document leading edge detecting means S31 is arranged. The pre-reading roller 421, the reading roller 423, and the post-reading roller 424 can rotate forward and backward.

The third conveying path 430 is provided with a reversing unit 432 for reversing an original and conveying it to the reading unit 422. The reversing unit 432 has a first reversing roller 433 and a second reversing roller 434. It is arranged. First reversing roller 43
The third and second reversing rollers 434 can rotate forward and backward. A paper discharge roller 441 is arranged in the discharge unit 440.

The feed roller 412, the separation roller 413, the double feed prevention roller 900, the registration roller 414, and the first and second reversing rollers 433 and 434 are driven by the first motor M1.

Next, the drive system of the first motor M1 will be described. The drive system of the first motor M1 is arranged on the back side of the image forming apparatus main body 1A. The rotational force from the motor shaft 500 of the first motor M1 is transmitted to the driven gear 504 of the drive shaft 503 arranged above via the drive gear 501 and the timing belt 502, and the pulley 505 fixed to the drive shaft 503 is rotated. To do.

By the rotation of the pulley 505, the pulley 507 is rotated via the timing belt 506, and the gear 508 coaxial with the pulley 507 is rotated and transmitted to the clutch mechanism 600. The clutch mechanism 600 includes a clutch shaft 601, a clutch gear 602 rotatably provided on the clutch shaft 601, and an electromagnetic clutch 603 arranged on the clutch shaft 601. Electromagnetic clutch 6
When the clutch gear 602 rotates by connecting 03, the clutch shaft 6
01 rotates integrally, and the rotation of the clutch gear 602 is not transmitted to the clutch shaft 601 when released.

When the clutch shaft 601 rotates, the clutch shaft 6
The gears 510 and 511 provided on 01 rotate integrally, and the gears 512 to 513 which mesh with the gear 510
514 is interlocked and rotates, and the pulley 516 provided in the intermediate shaft 515 of the gear 514 is rotated. The rotation of the pulley 516 is transmitted from the pulley 518 to the drive shaft 519 via the timing belt 517.

The movable original pressing plate 520 moves up and down by the rotation of the drive shaft 519, and the original on the movable original pressing plate 520 is pressed against the feeding roller 412. A torque limiter 521 is arranged on the drive shaft 519. The lifting / lowering operation of the movable original pressing plate 520 is regulated by the torque limiter 521, and the original pressing force of the movable original pressing plate 520 is adjusted.

The rotation of the gear 511 of the clutch shaft 601 causes the gears 522 and 530 to rotate together. The drive shaft 536 is rotated by the rotation of the gear 522, and the double feed prevention roller 900 below the separation roller 413 provided on the drive shaft 536 is rotated. Further, the drive shaft 531 rotates via the gear 530, and the rotation of the drive shaft 531 is transmitted to the roller drive shaft 533 via the mechanical coupling 532. The rotation of the roller drive shaft 533 rotates the separation roller 413 and the delivery belt drive shaft 535 through the timing belt 534. The rotation of the delivery roller drive shaft 535 causes the delivery roller 412 to rotate in conjunction with each other.

The mechanical coupling 532 is shown in FIG.
As shown in (b) and (c), the pin 532c provided at the tip of the drive shaft 531 is engaged with the pin groove 532b of the coupling 532a provided on the roller drive shaft 533. Further, a coupling return spring 532d is provided between the drive shaft 531 and the coupling 532a, and the coupling return spring 532d always has the pin 532c.
The coupling 532a is biased so as to come into contact with the end portion 532b1 of the pin groove 532b in (c).

When the feeding of the original placed on the paper feed tray 201 is completed, the first motor M1 is rotated in the reverse direction to lower the movable original pressing plate 520 and move to the position shown by the solid line in FIG. , The drive shaft 531 rotates in the reverse direction and the coupling return spring 532d causes the coupling 532a to cause the pin 53
2c moves to the position shown by the chain double-dashed line in FIG. 7C, and the pin 532c abuts against the end portion 532b1 of the pin groove 532b and is held.

When the first motor M1 is rotated in the normal direction when the original is placed on the paper tray 201 and sent out again, the drive shaft 531 rotates in the normal direction, but the pin 532c has two points in FIG. 7 (c). Because of the position shown by the chain line, the coupling 532a rotates and the pin 532c moves in the pin groove 532b to move the end 532b.
2 is not transmitted until it abuts, and the pin 532c is not transmitted to the pin groove 532.
By contacting the end portion 532b2 of b, the coupling 5
The rotation is transmitted to the roller drive shaft 533 via 32a.

Thus, the pin groove 532b delays the transmission in the rotation direction of the coupling 532a, and the separation roller 413 is pressed until the movable original pressing plate 520 presses the original.
The rotary drive is not transmitted to the drive roller, and the operation of the separation roller 413 and the movable original pressing plate 520 is mechanically delayed so that the first motor M1 which is the drive source can be rotated normally and reversely. Can operate in control.

Further, the movable original pressing plate 520, the feeding roller 412, the separation roller 413, and the double feeding prevention roller 90.
No. 0 is driven by the first motor M1 and has the same drive source, so that the number of parts is reduced, and the arrangement space is easy to secure and the structure is compact.

The rotation of the gear 511 of the clutch shaft 601 causes the gears 540 and 541 to rotate in conjunction with each other, the gear 543 of the registration roller drive shaft 542 also rotates, and the rotation of the registration roller drive shaft 542 lowers the registration roller 414. The side roller rotates, and the upper roller rotates together.

A gear 550 is fixed to the drive shaft 503, and this gear 550 rotates a gear 552 of a drive cylinder 551 rotatably supported by the drive shaft 519. By the rotation of the gear 552, the drive shaft 556 is driven from the pulley 553 of the drive cylinder 551 through the timing belt 554 and the pulley 555.
To rotate. The drive roller 55 is provided at the center of the drive shaft 556.
7, the upper roller of the second reversing roller 434 is rotated by the drive roller 557, and the lower roller is rotated in conjunction therewith.

A gear 558 is provided at the end of the drive shaft 556. The rotation of the gear 558 causes the gears 559 and 560 to rotate, and the gear 560 causes the drive shaft 561 to rotate. The drive shaft 561 is provided with an upper roller of the first reversing roller 433, and the upper roller and the lower roller rotate together.

Pre-reading roller 421, reading roller 423,
The post-reading roller 424 and the paper discharge roller 441 are driven by the second motor M2. The drive system by the second motor M2 will be described. The drive system by the second motor M2 is arranged on the back side of the image forming apparatus main body 1A. Second motor M2
701 of the motor shaft 700, the pre-reading roller 421
The belt 706 is stretched around the pulley 703 of the drive shaft 702 and the pulley 705 of the drive shaft 704 of the post-reading roller 424, and the pre-reading roller 421 and the post-reading roller 424 rotate together. This belt 706 has an idle roller 7
At 07, pressure adjustment is performed.

A belt 713 is stretched over the pulley 710 of the drive shaft 702 of the pre-reading roller 421 and the pulley 712 of the drive shaft 711 of the read roller 423, and the pre-reading roller 4
21 and the reading roller 423 rotate in conjunction with each other.

A gear 714 is provided on the drive shaft 704 of the post-reading roller 424, and the rotation of the gear 714 causes the gear 71 to rotate.
5, 716 is transmitted to the gear 718 of the drive shaft 717, and the rotation of the drive shaft 717 causes the lower roller and the upper roller of the paper discharge roller 441 to rotate in conjunction with each other.

In addition, in the first transport path 410, the second transport path 420 and the third transport path 43 on the downstream side of the first transport path 410.
A first switching member 450 that can be switched to 0 is provided. The first switching member 450 is rotatably provided integrally with the support shaft 453. An arm 453a is provided at one end of the support shaft 453, and an arm 453 is provided at the other end.
b is provided, the arm 453a is biased by the spring 451, the first switching member 450 opens the second transport path 420,
The third transport path 430 is closed. Further, the arm 453b is operated by the solenoid 452 against the spring 451. When the solenoid 452 is operated, the second conveyance path 420 is closed and the third conveyance path 430 is opened.

Further, a second switching member 460 and a third switching member 470 which are integrally formed are rotatably supported on the support shaft 453. The second switching member 460 and the third switching member 470 are biased by the spring 471, the second switching member 460 opens the second transport path 420, and the third switching member 470.
Closes the third transport path 430.

The second transport path 420 includes the first transport path 410.
And a second switching member 460 that is urged in one direction to enable conveyance from both sides of the third conveyance path 430.
The switching member 460 is biased by the spring 471 so as to allow the conveyance from the first conveyance path 410 and regulate the conveyance from the third conveyance path 430, but the document is conveyed from the third conveyance path 430. When the original is conveyed, it can be automatically opened and conveyed.

A third switching member 470, which is urged in one direction to enable conveyance from both sides of the first conveyance path 410 and the second conveyance path 420, is arranged in the third conveyance path 430. The 3 switching member 470 uses the spring 471 to move the first transfer path 4
The first transport path 410 is urged so that the transport from the third transport path 430 is regulated and the transport from the third transport path 430 is permitted.
When an original is conveyed from the original, the original can be automatically opened and conveyed by the conveyance of the original.

First switching member 450, second switching member 460
The third switching member 470 can be opened and closed with the support shaft 453 of the same shaft arranged at the confluence of the first conveyance path 410, the second conveyance path 420, and the third conveyance path 430 as a fulcrum.
It is easy to secure the installation space at one place and can be downsized.

Further, on the downstream side of the reading section 422, a fourth switching member 490 capable of switching between the reversing section 432 and the discharging section 440 is provided so as to be rotatable integrally with the support shaft 493. An arm 493a is provided at one end of the support shaft 493, and an arm 493b is provided at the other end.
3a is urged by a spring 491 to open the inlet 440a of the discharge portion 440 and close the inlet 432a of the reversing portion 432. Further, the arm 493b is operated against the spring 491 by the solenoid 492, and
When 92 is operated, the inlet 440a of the discharge part 440 is closed,
The inlet 432a of the reversing unit 432 is opened.

In this embodiment, as shown in FIG.
In the document transport section 400 that transports and reads the document,
Photo interrupter type sensor S60 and sensor S60
An actuator 160 is provided for separating the transmission and the shielding depending on the presence or absence of a document. Sensor S60
Is attached to a skeleton 1000 made of a resin material, and the actuator 160 is attached to an opening / closing cover 162 that can be opened / closed for releasing when a document is jammed.

The actuator 160 includes an operating portion 160a.
The supporting member 160b and the blade portion 160c are provided, and the operating portion 160a and the blade portion 160c are integrally swingably supported by the opening / closing cover 162 with the supporting portion 160b as a fulcrum.

A coil spring 180 is provided on the support portion 160b of the actuator 160. The coil spring 180 has one end locked to the locking pin 181 of the opening / closing cover 162 and the other end locked to the locking pin 182 of the operating portion 160a, so that the operating portion 160a is always open / closed.
It is urged so as to contact the stopper 183 of 62.

The blade portion 160 of this actuator 160
When c is at the position of the sensor S60, it is detected that the document is not in the document transport section 400, and the blade section 160c causes the sensor S to move to the sensor S60.
When it is not at the position of 60, it is detected that the document is in the document conveying section 400.

That is, when the original is not conveyed, the operating section 160a and the blade section 160c are in the positions shown by the solid lines in FIG. 9, and when the original is conveyed, the operating section 160a is pushed by the original and two points are shown in FIG. It is rotated and lifted as shown by the chain line. In this way, the operating portion 160a rotates against the coil spring 180 as shown by the chain double-dashed line, so that the blade portion 160c moves from the position where the solid line sensor S60 is blocked to the position where the double-dashed line penetrates. However, since the sensor S60 is out of the position, the presence of the document is detected by the transmission.

When the original is conveyed, the operating portion 160a is automatically moved downward by the coil spring 180 to the position shown by the solid line in FIG.
Since there is a position of 60, the absence of a document is detected by the shielding.

The actuator 160 includes a support portion 16
0b is attached to the opening / closing cover 162, and the opening / closing cover 1
Reference numeral 62 is attached to the front cover 163 via a support shaft 164 so as to be openable and closable. Further, the front cover 163 is openably and closably supported by the skeleton 1000 via a support shaft 169.

Therefore, when a document is clogged in the document transport section 400 for transporting and reading the document,
As shown in FIG. 10, the front cover 163 is opened with the support shaft 169 as a fulcrum, and the opening / closing cover 162 is opened with the support shaft 164 as a fulcrum in the arrow direction.
The original jam can be removed by removing the original jammed in the paper.

The actuator 160 is attached to the opening / closing cover 162 side, and when the original is jammed when the original is conveyed and read, the actuator 160 is released when the opening / closing cover 162 is opened and released. A space for various original jams can be secured, and the actuator 160 is not damaged during the processing for original jams.

Further, the actuator 1 is attached to the opening / closing cover 162.
A regulation means 173 for regulating the movement of the 60 is provided. As shown in FIGS. 11 and 12, the regulating means 173 includes a mounting portion 173a, a pressing portion 173b, and a regulating portion 173.
have c. The mounting portion 173a of the restricting means 173 is rotatably mounted on the support portion 162a of the opening / closing cover 162, and the restricting portion 173c and the locking portion 16 of the opening / closing cover 162.
A spring 174 is provided between the restriction portion 1 and 2b.
The end portion 173c1 of 73c is in contact with the blade portion 160c of the actuator 160.

When the opening / closing cover 162 is closed, FIG.
1, the protrusion 173b1 of the pressing portion 173b abuts the receiving portion 1000a of the skeleton 1000, and the spring 1
74 is in an extended state, and the blade portion 160c of the actuator 160 can detect the document d at the position of the sensor S60.

When the opening / closing cover is opened when the original is jammed, the spring 17 in the extended state is opened as shown in FIG.
4 contracts, which causes the end portion 173c1 of the restriction portion 173c.
Pushes the blade portion 160c of the actuator 160 so that the actuator 160 stays at a predetermined position of the opening / closing cover 162 when the cover is opened.

Therefore, even if the opening / closing cover 162 is opened during the jam processing of the document d, the damage of the actuator 160 can be prevented by storing the actuator 160 in the fixed position when the cover is opened. Further, even if the document d under the actuator 160 remains when the cover is closed, it will not be broken. Further, since the restricting means 173 restricts the movement of the actuator 160, the structure is simple, so that no cost is required.

Further, a photo interrupter type sensor S70 is provided in the ejecting section 440 for ejecting the read document.
Further, an actuator 170 is provided for separating the sensor S70 from the presence or absence of an original document so that the sensor S70 can be shielded or shielded. The actuator 170 has an actuating portion 170a, a support shaft portion 170b, and a blade portion 170c.
The operating portion 170a and the blade portion 170c are swingably supported integrally with each other with 70b as a fulcrum. When the operation section 170a is pushed by the conveyance of the document d and the actuator 170 swings, and the blade section 170c of this actuator 170 is at the position of the sensor S70, it is detected that the document is not in the discharge section 440, and the blade section is detected. When 170c is not at the position of the sensor S70, it detects that the document is in the discharge section 440.

When reading one side of the document d in this embodiment, as shown in FIG. 13, the one side of the document d is conveyed by the one-sided paper feed path P1 for reading and discharging the one side by the reading unit 422.

That is, the documents d stacked on the paper feed tray 201
Are separated and conveyed one by one, and the timing and bending of the document sent by the registration roller 414 are corrected. First
Since the switching member 450 closes the third transport path 430,
The document d is conveyed from the first conveyance path 410 to the second conveyance path 420.

At this time, the second switching member 460 opens against the spring 461 by the conveyance of the document d, and the reading unit 422 reads one side of the document d. The read document d is discharged onto the discharge tray 301 through the discharge unit 440 because the fourth switching member 490 closes the inlet 432a of the reversing unit 432 and opens the inlet 440a of the discharge unit 440. To be paper.

When reading both sides of the original document d, as shown in FIG. 14, one side of the original document d is read by the reading unit 422.
Then, the sheet is guided to the reading and reversing unit 432, and the other side of the document d is read from the reversing unit 432 by the reading unit 422 and is conveyed to the double-sided paper feed path P2.

That is, the documents d stacked on the paper feed tray 201
Are separated and conveyed one by one, and the timing and bending of the document sent by the registration roller 414 are corrected. The solenoid 452 operates and the first switching member 450 opens the third transport path 430, and the document d is transported from the first transport path 410 to the third transport path 430.

In the third conveying path 430, the driving of the clutch mechanism 600 is connected, the first motor M1 is normally rotated, and the first reversing roller 433 and the second reversing roller 434 of the reversing unit 432 are normally rotated. The original document d is carried in by the clutch mechanism 6
The drive of 00 is released and the first motor M1 is rotated in the reverse direction. As a result, the first reversing roller 433 and the second reversing roller 43
4 reverses and switches back the document d and conveys it.
Through the switching member 460 and the third switching member 470, the third transport path 430 is transported to the second transport path 420, and the reading unit 4
22 reads one side of document d.

In the read document d, the solenoid 492 is actuated and the fourth switching member 490 causes the reversing section 4 to move.
32 inlet 432a is opened, and outlet 440 inlet 440
Since a is closed, the first motor M1 is rotated in the reverse direction to rotate the pre-reading roller 421, the reading roller 423, and the post-reading roller 424.
Reversely, the first motor M1 is normally rotated, the first reverse roller 433 and the second reverse roller 434 of the reverse section 432 are normally rotated, and the reverse section 432 is passed through the inlet 432a of the reverse section 432.
Sent to.

In the normal rotation of the first motor M1, the drive of the clutch mechanism 600 is connected and the feed roller 41
2. The separation roller 413 and the registration roller 414 rotate, the double-sided original is reversed, and the next original is conveyed to the registration roller 414 at the timing of conveying to the reading unit 422.
Transport has been completed.

Then, the driving of the clutch mechanism 600 is released, the first motor M1 is reversely rotated, the first reverse roller 433 and the second reverse roller 434 are reversely rotated, and the document d is switched back and conveyed, and the second switching is performed. From the third conveyance path 430 to the second conveyance path 420 via the member 460 and the third switching member 470.
Then, the reading section 422 reads the other side of the document d. The productivity can be improved by reversing the double-sided original document, conveying the next original document to the registration roller 414 at the timing of conveyance to the reading unit 422, and ending the conveyance.

The original document d that has been read is the fourth
The switching member 490 closes the inlet 432a of the reversing section 432.
Since the inlet 440a of the discharge unit 440 is opened, the sheet is discharged onto the discharge tray 301 through the discharge unit 440.

The document conveying device capable of reading one side of the document d and both sides of the document d is a document in which the leading end of the document is abutted by a pair of rollers arranged upstream of the reading unit 422 and downstream of the reversing unit 432. It has a registration mechanism A, and this document registration mechanism A is composed of a pre-reading roller 421.
The document registration mechanism A is placed upstream of the reading unit 422 and in the reversing unit 4.
It is arranged downstream of 32, and the front end of the document is abutted and aligned by a pair of rollers of the document registration mechanism A.

A resist loop forming space SP1 that allows a loop of the originals d generated when aligning the originals d by the original document registration mechanism A is formed in the single-sided sheet passing path P1, and a resist loop forming space SP2 is formed in the double-sided sheet passing path P2. Then, the loop of the original document d generated when aligning the original documents by the original document registration mechanism A is set as the registration loop forming spaces SP1, SP.
By allowing 2 for the original d, it is possible to surely correct the bending of both one side and both sides of the original document d.

Further, the document position detecting means S41 is arranged on the upstream side of the document registration mechanism A, and the document position detecting means for detecting the position of the document immediately after the confluence of the single-sided sheet passing path P1 and the double-sided sheet passing path P2. By disposing S41, it is possible to detect the position of the document d on one side or both sides of the document d.

In addition, the second conveyance path on the downstream side from the first conveyance path 410
It has a first switching member 450 capable of switching between the transport path 420 and the third transport path 430, and the first transport member 420 has a first switching member 450.
A second switching member 460 that is urged in one direction to enable conveyance from both sides of the transport path 410 and the third transport path 430 is provided, and the third transport path 430 includes the first transport path 410 and the second transport path 430. A third switching member 470 is provided that is urged in one direction to enable conveyance from both sides of the conveyance path 420.

Further, the pre-reading roller 421, the reading roller 423, and the post-reading roller 4 arranged on the second transport path 420.
Reference numeral 24 denotes a pair of forward / reverse rotatable conveying rollers, and first and second reversing rollers 433 and 434 arranged in the third conveying path 430 are a pair of forward / reverse rotatable conveying rollers. The paper discharge rollers 441 of the unit 440 are also a pair of transport rollers that can rotate in the forward and reverse directions.

When originals d of different sizes are placed on the paper tray 201 for reading, the original size cannot be determined when the originals d are placed on the paper tray 201.
The document is conveyed from the conveyance path 410 to the second conveyance path 420, and the document length detection means S21 determines the document size.

When the determination of the original size is completed, the second
The pre-reading roller 421, the reading roller 423, and the post-reading roller 424 arranged on the conveyance path 420 are reversely rotated, the paper discharge roller 441 of the discharge unit 440 is also reversely rotated, and the first reverse is arranged on the third conveyance path 430. The roller 433 and the second reversing roller 434 are reversed to return the document d from the second conveyance path 420 to the third conveyance path 430. Then, the third transport path 430
The first reversing roller 433 and the second reversing roller 434 arranged in the forward direction are rotated in the normal direction, and the pre-reading roller 421, the reading roller 423, and the post-reading roller 42 arranged in the second transport path 420.
4 is rotated in the normal direction, and further, the discharge roller 441 of the discharge unit 440 is also rotated in the normal direction to switch back, and then from the third conveyance path 430 to the second
The document d is conveyed to the conveyance path 420, and the reading unit 422 reads the document d.

The delivery roller 412, by the first motor M1
The separation roller 413, the double feed prevention roller 900, the registration roller 414, and the first reversing roller 431 and the second reversing roller 432 are driven, and the pre-reading roller 4 is driven by the second motor M2.
21, the reading roller 423, the post-reading roller 424, and the paper discharge roller 441 are driven, and the feeding roller 412, the separation roller 413, the double feeding prevention roller 900, and the registration roller 414.
Is provided with a clutch mechanism 600 capable of connecting and disconnecting the drive, and when the document is fed, the clutch mechanism 600 is connected to drive the feed roller 412, the separation roller 413, the double feed prevention roller 900, and the registration roller 414. The first reversing roller 431 and the second reversing roller 432 are driven,
At the time of reversal, the clutch mechanism 600 is released and the feeding roller 412, the separation roller 413, the double feeding prevention roller 900,
The registration roller 414 is not driven.

In the embodiment of the present invention, the document conveying device connected to the copying machine is shown. However, an image forming apparatus such as a printer or a facsimile, a multifunctional machine having a plurality of these functions, a light printing machine, or the like. The present invention can also be applied to a document feeder used by connecting with

[0092]

As described above, according to the first aspect of the present invention, even if the opening / closing cover is opened when the original is jammed, the actuator is damaged by storing it in a fixed position when the cover is opened. Can be prevented. Also, even if the document under the actuator remains when the cover is closed, it will not break. Furthermore, since the restricting means restricts the movement of the actuator, the cost is low.

According to a second aspect of the present invention, the document feeder according to the first aspect is provided, and even if the opening / closing cover is opened during the jam processing of the document, the actuator installed in the opening / closing cover is It will not be damaged. Further, even when there is a document under the actuator when the opening / closing cover is closed, the document is not broken by the actuator.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an image forming apparatus equipped with a sheet post-processing device, a document conveying device, and an image reading device.

FIG. 2 is a sectional view of a document feeder.

FIG. 3 is a plan view of a document feeder.

FIG. 4 is an enlarged cross-sectional view of a main part of the document feeder.

FIG. 5 is an enlarged view of a switching unit.

FIG. 6 is a side view showing a drive system.

FIG. 7 is a plan view showing a drive system of a delivery roller.

FIG. 8 is a plan view showing a drive system of a reversing roller.

FIG. 9 is a diagram showing an arrangement of a sensor and an actuator of a document feeding unit.

FIG. 10 is a diagram showing a state in which an opening / closing cover is opened.

FIG. 11 is a diagram showing the actuator with the opening / closing cover closed.

FIG. 12 is a diagram showing an actuator with an opening / closing cover opened.

FIG. 13 is a diagram showing a single-sided sheet passing path.

FIG. 14 is a diagram showing a double-sided sheet passing path.

FIG. 15 is a cross-sectional view of a conventional document feeder.

[Explanation of symbols]

DF document feeder 1 Image forming device 1A Image forming apparatus main body 160,170 actuator 162 Open / close cover 173 Regulation means 201 paper tray 400 Document feeder 424a driven roller 424b Drive roller 440 discharge section S60, S70 Photo interrupter type sensor d manuscript

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masaru Aoki             2970 Ishikawa-cho, Hachioji-shi, Tokyo Konica Stock Association             In-house (72) Inventor Nobutaka Kato             1-7 Minamimachi, Higashi-Kurume City, Tokyo Metropolitan Government             Part 1-510 Room (72) Inventor Osamu Kato             3-1, Sakaemachi, Higashimurayama-shi, Tokyo 28             Yonekawa Mansion Room 309 F-term (reference) 2H076 BA08 BA15 BA35 BA52 BB02                 3F048 AA01 AB02 BA02 BB10 CB03                       CB04 DA01 DC09

Claims (2)

[Claims] 1. A paper feed tray on which an original is set, a feeding means for feeding the original set on the paper feed tray, an openable / closable open / close cover located above the feed means, and installed on the open / close cover. In an original conveying device having an actuator that operates according to an original set on the paper feed tray and a sensor that detects the original by the operation of the actuator, the opening / closing cover includes a restricting unit that restricts the movement of the actuator. The document conveying device, wherein the regulating means is configured such that the actuator can detect a document by the sensor when the cover is closed and the actuator stays at a predetermined position of the open / close cover when the cover is opened. 2. An image forming apparatus comprising the document feeding device according to claim 1.