JPH08208111A - Automatic document feeding device - Google Patents

Abstract

PURPOSE: To provide an image formation device which easily copies a stapled document. CONSTITUTION: An image formation device is provided with an automatic document feeding device for automatically feeding a document to a document loading table, and a staple removal device 38 provided on this automatic document feeding device. The staple removal device has a staple detection mechanism 46 for detecting a staple attached in the document loaded on the automatic document feeding device and a staple removal mechanism 62 for ruing the staple from the document, when the staple is detected by the staple detection mechanism.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic document feeder for automatically feeding a document to a document table of an image forming apparatus.

[0002]

2. Description of the Related Art In recent years, many image forming apparatuses, for example, copying machines equipped with an automatic document feeder (hereinafter referred to as ADF) for automatically feeding a document to a document mounting table have been provided. .

The ADF takes out a large number of set originals one by one and sequentially supplies them to the original placing table. Therefore, when copying a plurality of stapled originals using the ADF, the user needs to mount the originals on the ADF after removing the staples.

[0004]

As described above, when copying a plurality of stapled originals using the ADF, the user needs to remove the staples in advance, which makes the operation troublesome. Further, if the removing tool for removing the needle is not near the copying machine, it may be difficult to copy using the ADF.

On the other hand, if a document is loaded into the ADF with the stylus still attached and copying is started, the document may be torn off or the document may be jammed. The present invention has been made in view of the above points, and an object thereof is to provide an image forming apparatus capable of easily copying a stapled original.

[0006]

In order to achieve the above object, an automatic document feeder of the present invention according to claim 1 is provided in the document feeder for feeding a document to a document table and the document feeder. A detection unit that detects a metal piece attached to the document loaded in the document feeding device.

An automatic document feeder according to a second aspect of the present invention is a document feeder for feeding a document to a document table, and a document provided in the document feeder and mounted on the document feeder. A detection unit that detects the attached metal piece and a removal unit that removes the metal piece from the original when the metal piece is detected by the detection unit are provided.

According to a fourth aspect of the present invention, there is provided an automatic document feeder which comprises a placing section on which an original is loaded, original detecting means for detecting the presence or absence of an original in the placing section, and the original detecting means. Metal detecting means for detecting the presence or absence of a metal piece attached to the original when the presence of the original is detected, and removing means for removing the metal piece from the original when the metal piece is detected by the metal detecting means And a sheet feeding unit that sequentially feeds the documents placed on the placing unit when the presence of the metal piece is not detected and when the metal piece is removed by the removing unit. .

[0009]

According to the automatic document feeder constructed as described above, when the document is loaded in the document feeder, the detecting means detects the presence or absence of the metal piece attached to the document. When the metal piece is detected by the detecting means, that is, when the loaded original is stapled by the needle as the metal piece, the operation of the original feeding device is stopped. As a result, the stapled original is not fed by mistake, and the original is prevented from being damaged or jammed.

Further, according to the automatic document feeder of the second aspect, when the detecting means detects the metal piece attached to the original, the removing means removes the metal piece from the original. According to the automatic document feeder of claim 4, when the document is loaded on the placing portion and the document detecting unit detects the presence of the document, the metal detecting unit detects the presence or absence of the metal piece attached to the document. To be done. When no metal piece is detected by the metal detecting means, the loaded originals are sequentially fed by the paper feeding means. Further, when a metal piece is detected by the metal detecting means, that is, when the loaded original is stapled by the needle as a metal piece, the original is fed by the paper feeding means after the needle is removed by the removing means. To be paper.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a copying machine equipped with an automatic document feeder according to the present invention will be described in detail below with reference to the drawings. As shown in FIG. 1, the copying machine includes a main body 10 and an original placing table (original table) 12 made of a transparent glass plate provided on the upper surface of the main body. On the upper surface of the main body 10,
An automatic document feeder (hereinafter referred to as ADF) 14 for automatically feeding a document to the document table 12 is provided so as to be openable and closable with respect to the document table. The ADF 14 also functions as a document retainer that brings the document D set on the document table 12 into close contact with the document table. Further, on the front part of the upper surface of the main body 10, there is provided a display section 18 for displaying various information, and an operation panel 16 having a large number of keys 20 for inputting various information and setting a copy mode. The key 20 includes a key for setting a needle removal mode described later.

In the main body 10, as will be described later, an image reading section for reading the image of the original D placed on the original placing table 12, an image forming section for forming a developer image according to the read image, There is provided a known component (not shown) that forms an image in accordance with an electrophotographic process, such as a sheet feeding unit that supplies copy sheets to the image forming unit.

As shown in FIGS. 2 and 3, the ADF 14
Is a document tray 2 as a mounting portion on which the document D is placed.
2. An empty sensor 23 as a document detecting means for detecting the presence or absence of a document, a pickup roller 24 for taking out the document from the document tray 22 one by one, a paper feed roller 25 for conveying the taken out document, and the front end of the document. An aligning roller pair 26, an aligning sensor 28 provided on the upstream side of the aligning roller pair for detecting the arrival of a document, and a size sensor 29 for detecting the size of the document D are provided.

Further, the ADF 14 is provided with a conveyor belt 30 arranged so as to cover almost the entire document placing table 12.
The document D fed from the left side in FIG. 3 to the document placing table 12 by the sheet feeding roller 25 and the aligning roller pair 26 is sent to a predetermined position on the document placing table by the conveyor belt 30 and positioned.

In the ADF 14, a reversing roller 31, a reversing sensor 32, a flapper 33, and a discharge roller 34 are arranged at the end opposite to the aligning roller pair 26 with the conveyor belt 30 in between. After the image information of the document D is read by the document reading unit in the copying machine main body 10, the document D is sent out from the document placing table 12 by the conveyor belt 30, and the reversing roller 31, the flapper 33, and the discharge roller 34 are fed. It is discharged onto the document discharge section 35 on the upper surface of the ADF 14.

When reading the back side of the document D, the flapper 3
The document D conveyed by the conveyor belt 30 is switched by switching 3 and is reversed by the reversing roller 31, and then is conveyed to a predetermined position on the document table 12 by the conveyor belt 30 again.

As will be described later, the ADF 14 drives the paper feed motor 36 that drives the pickup roller 24, the paper feed roller 25, and the aligning roller pair 26, the conveyor belt 30, the reversing roller 31, and the paper discharge roller 34. And a conveyance motor 37 for Then, the pickup roller 24, the paper feed roller 25, the aligning roller pair 2
6, the conveyor belt 30, the paper feeding motor 36, and the conveyor motor 37 constitute the paper feeding means in the present invention.

The ADF 14 is the pickup roller 2
4 is provided with a needle removing device 38 provided on the upstream side.
The staple removing device 38 detects whether or not the document D placed on the document tray 22 has a staple, that is, whether or not the document is stapled. Remove this. Hereinafter, the configuration of the needle removing device 38 will be described in detail.

As shown in FIGS. 2 to 5, the needle removing device 38 includes a support plate 40 having a substantially rectangular shape.
A needle detection mechanism and a needle removal mechanism, which will be described later, are attached. The support plate 40 includes a pair of parallel guide rails 41.
It is slidably supported by. The guide rail 41 extends in a direction orthogonal to the feeding direction of the document D, and each end thereof is fixed to the support frame 42 of the ADF 14.

Further, a transport motor 43 capable of rotating in the forward and reverse directions is attached to the support frame 42, and a toothed belt 44 is provided between a drive gear 43a fixed to the rotary shaft of the transport motor and a driven gear (not shown). It has been passed. The toothed belt 44 extends in the vicinity of one of the guide rails 41 in parallel with the guide rate, and a part of the belt 44 is provided on the support plate 4.
It is fixed at 0. Therefore, by driving the transport motor 43, the support plate 40 is reciprocated along the guide rails 41. End sensors 41 are provided at both ends of the movable range of the support plate 40.

The guide rail 41 and the transport motor 4
3 and the toothed belt 44 function as a moving unit that moves a detection unit of a needle detection mechanism, which will be described later, along the document. A support arm 45 is fixed to the lower surface of the support plate 40 and extends downward. A lower end portion 45a of the support arm 45 is bent at a right angle and extends substantially parallel to the support plate 40, and a needle detection mechanism 46 as a metal detection means is provided at this lower end portion.

As shown in FIGS. 4, 6 and 7, the needle detecting mechanism 46 includes a movable lever 48 to which a detecting portion 47 is attached, and a driving portion for reciprocally driving the movable lever. The movable lever 48 is formed in an elongated rectangular shape and has a long hole 48a formed along the longitudinal direction thereof and a rack 48b formed at one side edge thereof. Then, the movable lever 48 is attached to the lower surface side of the lower end portion 45a by a pair of guide pins 49 fixed to the lower end portion 45a of the support arm 45 through the elongated hole 48a, in the direction of arrow A,
That is, the support plate 40 can reciprocate along the direction orthogonal to the moving direction.

The detecting portion 47 is fixed to one end of a movable lever 48 and is moved integrally with the movable lever. As the detection unit 47, for example, a metal sensor that magnetically detects a needle as a metal piece is used. In addition, as a detection unit,
You may use the sensor etc. which detect a needle optically.

The drive unit has a drive motor 50 fixed to the upper surface of the lower end portion 45a, and the rotation shaft of the drive motor extends through the lower end portion 45a to the lower surface side. A pinion gear 50a is fixed to the extended end of the rotary shaft and meshes with the rack 48b of the movable lever 48. Therefore, by driving the drive motor 50, the detection unit 47 is moved between the detection position shown in FIGS. 6 and 7 that largely projects from the lower end portion 45a of the support arm 45 and the retracted position adjacent to the lower end portion 45a. It At the detection position, the detection unit 47 faces one side edge of the document D set on the document tray 22. By moving the support plate 40 in this state, the detection unit 47 moves along one side edge of the document D and detects the presence or absence of a staple.

On the other hand, as shown in FIGS. 4, 5 and 8, a substantially rectangular rotary plate 52 is rotatably provided on the upper surface of the support plate 40. That is, a circular through hole 53 and a pair of arc-shaped guide holes 5 are formed in the substantially central portion of the support plate 40.
4 and a pair of arcuate through holes 55 are formed.
The guide hole 54 and the through hole 55 are formed coaxially with the through hole 53, and one guide hole 54 and one through hole 55 are provided on both sides of the through hole 53. Then, the rotating plate 52 is inserted into the guide hole 54 and is inserted into the rotating plate 52.
A pair of guide pins 55 fixed to the support plate 40 are rotatably mounted on the support plate 40 around the axis of the through hole 53.

The rotating plate 52 has one end 5 formed in an arc shape.
2a, and a tooth 57 is cut at one end thereof. Further, on the upper surface of the support plate 40, the rack 5 meshed with the teeth 57 is formed.
A drive rod 58 having 8a is reciprocally provided along the tangential direction of the one end portion 52a. Further, the pinion gear 60 meshes with the rack 58a of the drive rod 58,
The pinion gear is fixed to a rotary shaft of a drive motor 61 fixed to the lower surface side of the support plate 40. Then, by driving the drive motor 61, the rotary plate 52 is rotated via the drive rod 58.

The needle removing mechanism 62, which functions as a removing means for removing the needle from the document D, is attached to the rotating plate 52 and is rotatable integrally with the rotating plate. Needle removal mechanism 62
Is provided with a solenoid 64 that functions as a driving means, and this solenoid is provided with a pair of support posts 63 so that the rotating plate 5
It is supported on the upper surface of 2. The plunger 65 of the solenoid 64 extends downward through the rotary plate 52 and the through hole 53 of the support plate 40. The plunger 65 is biased in the retracting direction, that is, upward by a compression coil spring 66 wound around the plunger between its tip and the lower surface of the rotating plate 52.

The needle removing mechanism 62 also includes a pair of substantially V-shaped removing claws 68. One ends of these removal claws 68 are rotatably supported on the tip of the plunger 65 by a holding ring 69. And the solenoid 64
The pair of removing claws 68 are moved up and down together with the plunger 65 with respect to the original by energizing the document.

At the other end of the removing claw 68, a convex claw portion 68 is provided.
a and a concave claw portion 68b are formed respectively, and these claw portions are formed so as to be meshed with each other by rotating the pair of removal claws 68 in a direction in which they approach each other. Then, as will be described later, by interlocking the claw portions 68a and 68b with the needle of the document D interposed therebetween, the needle can be removed from the document. The removal claw 68 is
A leaf spring 70 provided between them is normally biased in the opening direction so that the claw portions 68a and 68b are separated from each other.

Further, the needle removing mechanism 62 closes the removing claw in accordance with the descending operation of the removing claw 68 and also functions as a holding mechanism 72 for holding the document D near the needle.
It has. The holding mechanism 72 includes a pair of guide arms 74 fixed to the lower surface of the rotating plate 52, and these guide arms extend downward through the through holes 55 of the rotating plate. A pair of pressing arms 75 is provided inside the pair of guide arms 74, and extends downward beyond the guide arms 74.

Each holding arm 75 has a long hole 75a formed at the upper end thereof, and a guide pin 76 protruding from the opposing guide arm 74 is inserted into this long hole.
Further, each pressing arm 75 has a guide pin 75b extending upward from the upper end thereof, and the guide pin 75b extends upward through the through hole 55 of the support plate 40 and the rotating plate 52. The extended ends of these guide pins 75b are in contact with the leaf springs 78 fixed to the plunger 65, respectively. Therefore, each pressing arm 75 is supported movably along the extension direction of the pressing arm while being guided by the guide pins 75b and 76. A compression spring 79 is installed between each pressing arm 75 and the corresponding guide arm 74, and the pressing arm 75 is normally urged upward by this compression spring.

As can be seen from FIG. 8, the pair of guide arms 74 are provided so as to be inclined such that the distance between them gradually becomes narrower downward, and similarly, the pair of presser arms 75 include these. The intervals are provided so as to be gradually narrowed downward. Also, the removal claw 68
Is located between the pair of presser arms 75, and the leaf spring 7
0 are pressed against the opposing pressing arms.

As shown in FIGS. 9 to 11, when the solenoid 64 is energized and the plunger 65 descends, the leaf spring 78 also descends integrally with the plunger. Then, the leaf spring 7
The guide pin 75b is pressed by 8 and the pair of pressing arms 75 descends against the biasing force of the compression spring 79. Then, the lower end of the pressing arm 75 contacts the document D and presses the part of the document near the needle S. The document D has a different thickness depending on its type, and the height at which the pressing arm 75 contacts the document also differs. However, when the plunger 65 further descends after the lower end of the pressing arm 75 contacts the document D, the leaf spring 78 elastically deforms to absorb the difference in the document thickness.

On the other hand, as the plunger 65 descends, the pair of removing claws 68 also descend. At this time, the removal claw 68 descends while being in contact with the opposing pressing arm 75. And
Since the interval between the pressing arms 75 is gradually narrowed downward, the pair of removal claws 68 are pressed by the pressing arms 75 and gradually close. Accordingly, the claw portion 68a,
68b gradually approaches, starts engaging after contacting the document D, and completely meshes with each other when the plunger 65 is completely lowered. During this time, as shown in FIG.
a and 68b enter between the document D and the needle S, and the needle S is removed from the document.

As shown in FIGS. 4 and 13, the needle removing device 38 includes a storage mechanism 80 for receiving and storing the needle S removed by the removing claw 68. Storage mechanism 80
Is a needle receiving tray 82 provided at the lower end portion 45a of the support arm 45 movably between a receiving position located below the removing claw 68 and a retracted position retracting from the removing claw, and a storage box for storing the needle. 83 and a guide tray 84 for guiding the needle received by the needle receiving tray to the storage box.

The storage mechanism 80 has a structure in which the lower end portion 45a of the support arm 45 is in the direction of arrow B, that is, the guide rail 41.
First mounted movably along a direction orthogonal to
Drive arm 85 and a second drive arm 86 movably attached in the direction C of the arrow orthogonal to the first drive arm. Racks 85a and 86a are formed on the first and second drive arms 85 and 86, respectively, and in these racks, the pinion gear 8 driven by a drive motor 87 attached to the support arm 45 is formed.
8 meshes.

An intermediate portion of the needle receiving tray 82 is rotatably connected to the first drive arm 85 via a pivot pin 89. A guide pin 90 is provided at the rear end of the needle receiving tray 82, and the guide pin is slidably engaged with a long hole 91 formed at the front end of the guide tray. The middle portion of the guide tray 84 is rotatably connected to the second drive arm 86 via the pivot pin 92. Further, the guide pin 9 is provided at the rear end of the guide tray 84.
4 is provided, and this guide pin is slidably engaged with an elongated hole 95 formed in the storage box 83.

When the drive motor 87 is driven, the first and second drive arms 85 and 86 move leftward and upward in FIG. 13, respectively, and the needle receiving tray 82 moves to the receiving position shown in the figure. Then, the needle received by the needle receiving tray 82 from the removing claw 68 is sent to the storage box 83 via the guide tray 84.

When the drive motor 87 is reversely driven after the needle is stored, the first and second drive arms 85 and 86 are provided.
Move to the right and downward respectively, and the needle receiving tray 82
Is moved to the support arm 45 side and retracted from below the removal claw 68.

FIG. 14 schematically shows the construction of the control system and drive system of the copying machine constructed as described above. As can be seen from this figure, the control system includes a main control unit 100 that controls the operation of the entire copying machine. The main control unit includes the image reading unit 4, the image forming unit 6, the paper feeding unit 7, and the operation panel. 16 are connected. Further, the main control unit 100 has
A ROM 102 in which various control data and the like are recorded, and a RAM 104 which stores data and the like detected by various sensors and performs various arithmetic processes are connected.

The ADF 14 has an ADF control section 108 connected to the main control section 100 via the ADF interface 106 of the apparatus main body 10. This ADF control section includes:
A motor driver 110 that drives a paper feed motor 36 and a conveyance motor 37, an empty sensor 23, an aligning sensor 28, a size sensor 29, and a reversing sensor 32.
Is connected.

On the other hand, the ADF control unit 108 is connected to a control unit 112 for controlling the operation of the needle removing device 38. A motor driver 114 that drives the carry motor 43, a motor driver 116 that drives the drive motors 50, 61, 87, a driver 118 that drives the solenoid 64, a detection unit 47, and an end sensor 41 are connected to the control unit 112. .

Next, the operation of copying the stapled document D using the ADF 14 by the copying machine configured as described above will be described. As shown in FIG. 15, first, a plurality of originals D stapled by the needle S are AD-printed.
The document tray 22 of F14 is loaded. In this case, FIG.
As shown in FIG. 3, the document D is loaded so that the side edge portion including the end portion stapled by the staple S is located on the insertion side, that is, is located on the take-out roller 24 side of the ADF 14.

Then, the operator operates the operation panel 16
When the copy start key is pressed after the desired copy mode is set via the, the empty sensor 23 of the ADF 14 is pressed.
The presence or absence of the document D is detected by. When the presence of the document D is detected, the conveyance motor 43 of the needle removing device 38 is turned on, and the needle removing mechanism 38 and the needle detecting mechanism 46 are moved along with the support plate 40 along the guide rail 41. In addition,
The detection unit 47 of the needle detection mechanism 46 is normally arranged at the detection position. Therefore, the detection unit 47 moves in a state of facing the insertion side side edge portion of the document D as the support plate 40 moves,
The presence or absence of the needle S is detected.

When the needle is not detected by the detector 47,
That is, when the document D is not stapled, the transport motor 43 is reversed at the time when the support plate 40 is detected by the end sensor 41, and the staple removing device 38 is returned to its home position. After that, the document D is sequentially sent to the document table 12 by the ADF 14, and the document D is copied in accordance with the set copy mode.

On the other hand, when the detection unit 47 detects the needle S, the conveyance motor 43 is stopped and the movement of the needle removing device 38 is stopped. Here, when the staple removal mode is not set together with the copy mode, for example, the operator does not know that the document is stapled and the operator sets the document in the ADF 14
When it is loaded into the printer, the main control unit 100 stops the operation of the ADF 14 and displays a warning such as “the document is stapled” on the display unit 18 of the operation panel 16.

When the operator presses the needle removal mode setting key in response to the warning, or when the needle removal mode is set in advance, the drive motor 50
Is turned on and the detector 47 is moved to the retracted position. Then, in this state, the removing operation of the needle S is started.

First, according to the position of the needle S detected by the detector 47, the rotation motor 61 rotates so that the opening / closing direction of the pair of removing claws 68 is orthogonal to the extending direction of the needle S. The plate 52 is rotated. Then, the solenoid 64 is energized and the plunger 65 is lowered. As a result, the pair of pressing claws 75 and the removing claw 68 descend, and as shown in FIGS. 10 to 12, while pressing the document D on both sides of the staple S by the pressing arm 75, the pair of the removing claws 68 removes the staple from the document D. S is removed.

Then, the energization of the solenoid 64 is turned off. Then, the urging force of the compression coil spring 66 raises the removal claw 68 and the pressing arm 75 together with the plunger 65. At the same time, the drive motor 87 of the storage mechanism 80 is driven so that the needle receiving tray 82 is at the receiving position, that is, the removing claw 6
Moved below 8. Then, the removal claws 68 open in the direction in which they are separated from each other as they rise, so that the claw portions 68a, 6a
The needle S removed by 8b is disengaged from the claw portion and dropped onto the needle receiving tray 82, and is further sent to the storage box 83 and stored therein. After the needle S is stored, the conveyance motor 43 is driven to reverse,
The needle removing device 38 is returned to the home position. This allows
The needle removal operation ends.

After that, the drive motor 50 is turned on and the detector 47 moves to the detection position, and then the carry motor 43 is driven. As a result, the detection unit 47 again moves while facing the insertion-side side edge of the document D, and detects the presence or absence of the needle S. Then, when the detection unit 47 does not detect the needle, the transport motor 43 is reversed at the time when the support plate 40 is detected by the end sensor 41, and the needle removing device 38 is returned to its home position. After that, ADF14
Then, the original D is sequentially sent onto the original table 12 and the original D is copied in accordance with the set copy mode.

According to the image forming apparatus constructed as described above, when a document is loaded in the automatic document feeder, the presence or absence of the staple attached to the document is detected by the staple detecting mechanism 46 of the staple removing device 38. It When the staple detection mechanism 46 detects a staple, that is, when the loaded document is stapled, the operation of the automatic document feeder is stopped. As a result, the stapled original is not fed by mistake, and the original is prevented from being damaged or jammed.

Further, when the staple removing mode is set and the staple detecting mechanism 46 detects a staple attached to the original, the staple removing mechanism 62 automatically removes the staple from the original. Therefore, even when a plurality of stapled originals are copied using the automatic document feeder, the user does not need to remove the stylus in advance and the copying operation can be easily performed.

The present invention is not limited to the above-described embodiments, but can be variously modified within the scope of the present invention. For example, in the above-described embodiment, the removing claw 68 may be formed of an electromagnet, and the removed needle may be once adsorbed and held by the removing claw and then discharged into the storage box. In this case, the removed needle can be prevented from being accidentally dropped, and the needle can be more reliably removed and stored. Further, although the removed needle storage mechanism 80 is configured to be driven by an independent drive motor 87, it is configured to operate by utilizing the driving force of the plunger by connecting the drive arm 86 to the plunger 65. May be.

Further, in the above embodiment, the stylus is removed from the original only when the stylus removal mode is set. However, if the stylus is detected regardless of the presence or absence of the stylus removal mode setting, automatic detection is performed. The needle may be selectively removed.

[0055]

As described above in detail, according to the present invention, the staple can be automatically removed from the stapled original, and the stapled plural originals can be easily damaged. It is possible to provide an automatic document feeder that can feed paper without doing so.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which an automatic document feeder of a copying machine according to an embodiment of the present invention is opened.

FIG. 2 is a perspective view showing the automatic document feeder.

FIG. 3 is a sectional view of the automatic document feeder.

FIG. 4 is a perspective view showing the entire needle removing device of the copying machine. .

FIG. 5 is a perspective view showing a support plate of the needle removing device and a drive mechanism thereof. .

FIG. 6 is a side view of a needle detecting mechanism of the needle removing device.

FIG. 7 is a rear view of the needle detecting mechanism of the needle removing device.

FIG. 8 is a side view showing a needle removing mechanism of the needle removing device in a state where a removing claw is opened.

FIG. 9 is a side view showing a needle removing mechanism of the needle removing device with the removing claw closed.

FIG. 10 is a perspective view showing a part of the needle removing mechanism in a state where the removing claw is opened.

FIG. 11 is a perspective view showing a part of the needle removing mechanism with the removing claw closed.

FIG. 12 (a) is a side view showing a state in which a needle is pulled up by the removing claw, and FIG. 12 (b) is a plan view showing a state in which a needle is pulled up by the removing claw.

FIG. 13 is a side view showing a storage mechanism of the needle removing device.

FIG. 14 is a block diagram schematically showing the overall configuration of the copying machine.

FIG. 15 is a flowchart showing an operation when copying a stapled document by the copying machine.

FIG. 16 is a perspective view showing a state in which a stapled document is loaded in the automatic document feeder.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Copier, 12 ... Original document feeder, 14 ... Automatic document feeder, 38 ... Needle removing device, 46 ... Needle detecting mechanism, 47 ... Detecting part, 52 ... Rotating plate, 62 ... Needle removing mechanism, 64 ... Solenoid, 65 ... Plunger, 68 ... Removal claw, 75 ... Holding arm, 80 ... Storage mechanism, 100 ... Main control section.

Claims (5)

[Claims] 1. A document feeding device for feeding a document to a document table, a detection means provided in the document feeding device for detecting a metal piece attached to the document loaded in the document feeding device, and the metal piece. An automatic document feeder including: a stop means for stopping the operation of the document feeder when the above is detected. 2. A document feeding device for feeding a document to a document table, a detection means provided in the document feeding device for detecting a metal piece attached to the document loaded in the document feeding device, and the detection means. An automatic document feeder including a removing unit that removes the metal piece from the original when the metal piece is detected by the. 3. A document feeding device for feeding a document to a document table, and a detection means provided in the document feeding device for detecting a metal piece attached to the document loaded in the document feeding device, which can mesh with each other. Drive means for removing the metal piece from the document by engaging the claw portion of the removing means at a position facing the metal piece with reference to the detection result by the detecting means And an automatic document feeder. 4. A placing section on which an original is placed, an original detecting means for detecting the presence or absence of the original in the placing section, and when the presence of the original is detected by the original detecting means, the original is attached to the original. A metal detecting means for detecting the presence or absence of the metal piece, a removing means for removing the metal piece from the original when the metal piece is detected by the metal detecting means, and a case where the presence of the metal piece is not detected and An automatic document feeder comprising: a sheet feeding unit that sequentially feeds documents placed on the placing unit when the metal pieces are removed by the removing unit. 5. A document feeding device that feeds a document to a document table, a detection unit that is provided in the document feeding device, and detects a metal piece, and a detection unit that detects a metal piece in a document loaded in the document feeding device. Referring to the detection result by the detection unit, a detection unit that has a moving unit that moves along the detection unit and that detects the metal piece attached to the document, a pair of removal units that have a claw portion that can mesh with each other, An automatic document feeder comprising: a drive unit that engages the claw portion of the removing unit at a position facing the metal piece to remove the metal piece from the document.