JPH10279103A - Automatic document feeder - Google Patents

Abstract

(57) Abstract: The present invention relates to a document feeder in which it is difficult to remove a document when the document is mis-fed because the paper feed means is on the document transport path. It is another object of the present invention to provide a document feeder capable of avoiding misfeed by a simple and space-saving mechanism. A misfeed processing knob (62) is provided on a drive shaft (56) of a paper feeding means, and when a document is misfeeded, the document is easily removed from a transport path by rotating the misfeed processing knob (62). Avoid document misfeeds.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feed function of an automatic document feeder mounted on a copying machine, a facsimile or the like.

[0002]

2. Description of the Related Art In recent years, with the digitalization of copiers, there has been an increasing demand for feeding originals in page order as in facsimile. Also, in consideration of space saving reasons and the like, turn-feed type copying machines are often used. In this turn paper feeding configuration, a method is adopted in which a document is set upward, and the document is fed and separated from above.

FIG. 9 shows the configuration of turn paper feeding of an automatic document feeder. As shown in FIG. 9, the automatic document feeder includes a document table 1, a call roller 4, a document set stopper 2,
0, pull-out rollers 7a and 7b, and a separation unit. 10 and 11 show the separation unit. As shown in FIGS. 10 and 11, the separation unit includes a reverse roller 6,
0, feed belt driving roller 51, feed belt driven roller 5
2. Document feed upper guide 61 and feed belt drive shaft 56
have.

Next, the operation of the automatic document feeder for feeding a document will be described. In this automatic document feeder,
The document m is set on the document table 1 with the image side of the document facing upward. The original m is set in the original set stopper 20.
, The tip is regulated. By pressing a copy start button (not shown) of the copying machine body, the original stopper 2
0 is released, the paper feed motor (not shown) rotates forward (clockwise), the call roller 4, the paper feed belt 50, and the pull-out roller 7b rotate forward, and the reverse roller 6 and the pull-out roller 7a rotate reversely. The document m set on the document table 1 is fed from the uppermost document by the normal rotation of the call roller 4, and is conveyed to a separation unit constituted by the feed belt 50 and the reverse roller 6. The fed document m is separated one by one by a paper feed belt 50 that rotates forward and a reverse roller 6 that rotates reversely in the document transport direction, and is pulled out of the separation unit by a pair of pull-out rollers 7a and 7b.
As described above, the document m is fed one after another.

[0005]

However, in this case, as shown in FIGS. 10 and 11, in order to transport the original m from the upper side, the paper feed belt 50, the paper feed belt driving roller 51,
The paper feed belt driven roller 52, the document feed upper guide 61, and the paper feed belt drive shaft 56 (feed means and members for guiding the paper feed means) are located above the document set surface, and are relatively small in size. When a document is misfeeded, a situation may occur in which the document cannot be easily processed. At this time, a method of avoiding document misfeeding by opening the conveyance guide portion in a direction in which the document can be easily taken out is generally performed, but a document feeder of the type described above for feeding the document from above. In (2), the drive system is located above the transport surface, which complicates the mechanism, which leads to a complicated and large-sized mechanism, and also to a reduction in the reliability of the machine.

Accordingly, in the case of this type of document feeder, if a misfeed occurs during document feeding, the document is removed by a simple and space-saving mechanism. An object of the present invention is to provide an automatic document feeder capable of removing a document from a document transport path and avoiding a paper jam in order to easily process the document.

[0007]

According to the first aspect of the present invention,
In order to achieve the above object, there is provided a document holding unit for preparing a document in advance, and a document feeding unit that takes out the document from the document holding unit and feeds the document by passing through a document conveyance path, In the automatic document feeder in which the document feeding means is located above the document feeding path, when the document feeding means fails to feed the document and pass through the document feeding path, A document removing means for removing the document from the document transport path is provided.

According to a second aspect of the present invention, there is provided the automatic document feeder according to the first aspect, wherein the document feeding means conveys the document and causes the document to pass through the document conveyance path. The apparatus has a drive shaft for applying a driving force, and the document removing unit rotates the drive shaft to remove a document from the document transport path. According to a third aspect of the present invention, in the automatic document feeder according to the second aspect, the document removing unit includes a cylindrical member so as to cover the drive shaft. The drive shaft is rotated by rotating the drive shaft.

According to a fourth aspect of the present invention, in order to achieve the above object, in the automatic document feeder according to the second aspect, the document removing means includes a lever-shaped member provided on the drive shaft, The drive shaft is rotated by reciprocating a member.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an overall view of an automatic document feeder according to the present invention. As shown in FIG. 1, the automatic document feeder includes a document feeder, a document feeder, and a reverse discharger. The document feeder, the document feeder, and the reverse discharger are independent of each other. Driving means (paper feed mode
, A transport motor, and a reverse discharge motor).

The document feeder includes a document table 1, a call roller 4, a document set stopper 20, a pull-out roller 7,
a, 7b and a separation unit, and the separation unit includes the reverse roller 6 and the sheet feeding belt 50. 2 and 3 show the separating section. As shown in FIGS. 2 and 3, in addition to the above, the separation unit includes a feed belt driving roller 51 and a feed belt driven roller 5.
2, a document feed upper guide 61, a feed belt drive shaft 56, and a document misfeed processing knob 62. Also,
The document conveying section includes a conveying belt 8 and a contact glass 9.
have. The reversing discharge section includes the document discharge trays 2 and 3, reversing drive rollers 10, discharge drive rollers 11, reversal discharge rollers 12, guide rollers 13, discharge rollers 14, first discharge switching claw 15, The second paper discharge switching claw 16 is provided.

Further, the two original discharge trays 2, 3
One is a document discharge tray 2 mounted on the right side of the copying machine main body, and the other is a document discharge tray 3 provided below the document table 1. Document output tray 2
Is a document discharge tray in the single-sided copy mode of the document, and the document discharge tray 3 is a document discharge tray in the double-sided copy mode of the document.

Next, the operation of the automatic document feeder in the single-sided copying mode will be described as an example. The operation in the double-sided copy mode is the same as the operation for paper feeding, and thus the description is omitted. In this automatic document feeder, the document m
Is set on the original table 1 with the image side of the original facing upward. The leading end of the document m is regulated by the document set stopper 20. When a copy start button (not shown) of the copier body is pressed, the original stopper 20 is pressed.
Is released, and the feed motor (not shown) rotates forward (clockwise).
Then, the calling roller 4, the sheet feeding belt 50, and the pull-out roller 7b rotate in order, and the reverse roller 6, the pull-out roller 7a
Rotates in reverse. Document m set on document table 1
Is fed from the uppermost document m1 by the forward rotation of the call roller 4, and is conveyed to a separation unit constituted by the paper feed belt 50 and the reverse roller 6. The fed document m is separated one by one by a paper feed belt 50 that rotates forward and a reverse roller 6 that rotates reversely in the document transport direction, and is pulled out of the separation unit by a pair of pull-out rollers 7a and 7b.

When the leading edge of the original is detected by the registration sensor S1 disposed downstream of the pull-out roller pair 7a, 7b, the driving direction of the paper feed motor is switched from normal rotation to reverse rotation (counterclockwise), and the driving system With the configuration, the call roller 4 and the paper feed belt 50 are stopped, and the pull-out roller pair 7a,
7b is rotated as it is, and the reverse roller 6 changes its direction of rotation and rotates forward to prevent the next original m2 from entering the separation section, and the current original m1 is pulled out by a pair of pull-out rollers 7a, 7a.
The sheet is conveyed from the sheet feeding section to the conveying section by b.

Simultaneously with the reverse rotation of the paper feed motor, the transport motor (not shown) rotates forward, and the original m1 is transported by the transport belt 8 onto the contact glass 9 and stopped at a predetermined position on the contact glass 9. After the registration sensor S1 detects the rear end of the document m1 conveyed by the conveyance belt 8, the conveyance motor conveys the document m1 by a predetermined number of pulses, and then stops the conveyance motor. Stop at a predetermined position.

After the feed motor and the transport motor are stopped, the feed motor rotates forward again, the next original m2 set on the original table 1 is separated and fed, and the registration sensor S1 detects the leading end of the next original m2. After detection, the original document m
2 has been conveyed, the feed motor is stopped, and the original m
The first advance operation is completed (the stop position of the document m2 is in the sheet feeding unit). The original m1 on the contact glass 9 is conveyed forward by the conveying motor after the exposing operation of the copier body is completed, and is conveyed by the conveying belt 8 to the reverse discharge section. In the single-sided copy mode, the first discharge switching claw 15 is at the retracted position (home position), and the lower side of the first discharge switching claw 15 serves as a guide for a document to the document discharge tray 2. ing.
The position in FIG. 1 is a position that has been lowered downward). At the same time as the forward rotation of the transport motor, the reverse discharge motor (not shown) rotates forward, and the original m1 conveyed to the reverse discharge section is moved by a pair of reverse drive rollers 10 and discharge drive rollers 11 to a document discharge tray. 2 is discharged.

Next, a description will be given of a process when a document is misfeeded. FIGS. 4 and 5 are schematic diagrams showing a case where a small-size document is misfeed in the document transport path. In order to remove the original, the original is taken out through a gap, and the original is taken out. However, in the conventional case, it is very difficult to take out the original because various paper feeding mechanisms are provided on the upper side of the original.

Therefore, as shown in FIGS. 2 and 3, a document misfeed processing knob 62 is attached to the front side of the feed belt driving shaft 56. As shown in FIG. 3, the document misfeed processing knob 62 has a cylindrical shape. If necessary, a knob on a knurl or a small groove is dug in the surface.
Prevent slippage when handling by hand. If necessary, rubber may be wound. Since the diameter of the document misfield processing knob 62 needs to be at least a certain size (approximately Φ30), if there is not enough space in the height direction, a place deviated from the document conveyance path (for example, Number side)
Is located. Functionally, the document misfeed knob 6
2 can be integrated with the feed belt drive shaft 56, but since no other parts can be attached during assembly, it is mounted on the shaft by incorporating parallel pins or a one-way clutch. In FIG. 2, when the document misfeed processing knob 62 is rotated clockwise, the paper feed belt 50 is also interlocked, and the document that has become a misfield is moved in the transport direction so that the document can be taken out.

FIGS. 6 and 7 are schematic diagrams when the misfeed document is taken out by the lever.
The document misfeed processing lever 65 in this case is provided with stoppers 65a and 65b on the sides as shown in FIG.
The movable range of the document misfeed processing lever 65 is regulated by c and 61d. Document misfeed lever 6
5 is provided with a one-way clutch. That is, in FIG.
Is moved in the direction of a, the paper feed belt drive shaft 56 is driven by the one-way clutch, and the paper feed belt 50 rotates (clockwise) to move the original in the transport direction and take out the original. When the document misfeed processing lever 65 can no longer be moved by the regulating member 61c, it is moved in the direction b in FIG. In this direction, the one-way clutch of the lever is not locked, so that the sheet feeding belt 50 does not move. When the document misfeed processing lever 65 returns to the position of the regulating member 61d, the lever is moved in the direction a again, and this operation is repeated until the document can be taken out.
Even if there is not enough space between the upper guide 61 and the drive shaft 56, there is no problem in this case. Therefore, by increasing the shape of the lever to some extent, the force for operating the lever is reduced. can do.

As described above, even if a misfeed of the document occurs, the document can be easily removed from the document transport path, and the document can be prevented from being misfeeded.

[0021]

According to the first aspect of the present invention, since the document removing means for removing the document from the document transport path is provided, it is possible to remove the document that could not pass through the document transport path. You can avoid misfeeds. According to the second aspect of the present invention, since the driving force for passing the document from the transport path is obtained by the rotation of the drive shaft, the document can be removed only by applying a rotational movement to the drive shaft, and a large-scale apparatus is required. Without misfeeding quickly.

According to the third aspect of the present invention, since the cylindrical member is provided on the drive shaft for providing the driving force for transporting the original, the original can be transported with a small operation force, and the misfeed can be prevented. You can get around quickly. According to the fourth aspect of the present invention, since the member on the lever is provided on the drive shaft for applying the driving force for conveying the original, the original can be conveyed with a small space and with a small operation force. You can quickly get around from the feed.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of an automatic document feeder according to the present invention.

FIG. 2 is a diagram illustrating a separation unit of the automatic document feeder according to the embodiment;

FIG. 3 is a diagram illustrating a separation unit of the automatic document feeder according to the embodiment;

FIG. 4 is a diagram illustrating a case where a misfeed of a document occurs in a separation unit of the automatic document feeder according to the embodiment;

FIG. 5 is a diagram illustrating a case where a misfeed of a document occurs in a separation unit of the automatic document feeder according to the embodiment;

FIG. 6 is a diagram in which a document misfeed processing lever is provided on a feed belt driving shaft of the automatic document feeder.

FIG. 7 is a diagram in which a document misfeed processing lever is provided on a feed belt drive shaft of the automatic document feeder.

FIG. 8 is a diagram illustrating a stopper of a document misfeed processing lever.

FIG. 9 is a diagram showing an example of turn feeding of the conventional automatic document feeder.

FIG. 10 is a diagram illustrating an example of a separation unit of a conventional automatic document feeder.

FIG. 11 is a diagram illustrating an example of a separation unit of a conventional automatic document feeder.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Document table 2 Document discharge tray 3 Document discharge tray 4 Recall roller 6 Reverse roller 7 Pull-out roller 8 Conveyor belt 9 Contact glass 10 Reverse drive roller 11 Discharge drive roller 12 Reverse discharge roller 13 Guide roller 14 Discharge roller 15 First discharge switching claw 16 Second discharge switching claw 20 Document set stopper 50 Feed belt 51 Feed belt drive roller 52 Feed belt driven roller 56 Feed belt drive shaft 61 Document feed upper guide 62 Document misfeed processing knob 65 Document misfeed processing lever

Claims (4)

[Claims] A document holding unit for preparing a document in advance; and a document feeding unit for taking out the document from the document holding unit and feeding the document through a document conveying path. In the automatic document feeder in which the document feeding means is located above the document feeding path, the document feeding means may not feed the document and pass the document when the document feeding means cannot pass through the document feeding path. An automatic document feeder having a document removing means for removing a document from a document transport path. 2. The automatic document feeder according to claim 1, wherein the document feeder has a drive shaft for applying a driving force for conveying the document and passing the document through the document transport path. An automatic document feeder, wherein the removing means removes the document from the document transport path by rotating the drive shaft. 3. The automatic document feeder according to claim 2, wherein said document removing means includes a cylindrical member covering said drive shaft, and rotates said drive shaft by rotating said cylindrical member. An automatic document feeder, wherein 4. The automatic document feeder according to claim 2, wherein the document removing means includes a lever-shaped member provided on the drive shaft, and the drive shaft is rotated by reciprocating the lever-shaped member. An automatic document feeder, wherein