JPH0289764A - Automatic document feeder - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to an automatic document feeder used in an image forming apparatus such as a copying machine or a laser beam printer. The present invention relates to an automatic document transport device including a belt.

(B) Prior Art Conventionally, an automatic document feeder equipped with a conveyor belt has been known.As shown in FIG. 3, the automatic document feeder 1a is mounted on a hinge ( (not shown)
It is supported so that it can be opened and closed freely. The automatic document feeder 1 has a document tray 5 on which the document M is stacked, and the tray 5 is provided with a regulating member 6 and a partition member 7 for regulating the movement of the document M in the width direction. It is set up. Further, near the downstream side of the tray 5, there is a document M from the tray 5.
A paper feed roller 9 is provided to feed the paper.
A weight 10 that presses the document M against the roller 9 and is movable up and down is disposed facing the roller 9 . Further, on the downstream side of the roller 9, a retractable stopper 11 for regulating the conveyance of the document M is disposed, and on the downstream side of the stopper 11,
A handling plate 12 for handling the original M is provided. A separating belt 13 and a conveying roller 15 for separating and conveying the originals one by one are arranged in close proximity to the separating plate 12.
A swingable guide 17 that forms part of the paper feed path 16 is provided downstream of the belt 13 and the roller 15 . Further, a pair of registration rollers 19 is arranged downstream of the guide 17, and a sheet bus 18 composed of a pair of guides 18a and 18b is arranged downstream of the roller pair 19. A conveyor belt 20 that covers the entire surface of the platen 3 is disposed downstream of the platen 3 and is wound around a drive roller 21 and a driven roller 22 . Further, the belt 20 is covered with a cover 23, and the cover 2
A discharge window 25 is provided at the tip of the tube 3. On the other hand, a U-shaped paper discharge path 27 is arranged on the left side of the conveyor belt 20, and the inner guide surface of the bent portion of the path 27 is constituted by a large roller 29. A pair of paper discharge rollers 30 is provided. In addition, the paper ejection path 2
A reversing path 31 is communicated from 7 to the upstream side of the pair of registration rollers 19 of the sheet feeding path 16, and a flapper 32 is disposed at a branch point between the reversing path 31 and the sheet ejecting path 27.

If the document M is left on the platen 3 after copying in the pressure plate mode without using the automatic document feeder 1a, the document M is placed on the platen 3 while the automatic document feeder 1a is in use. If a paper jam occurs or the power is turned off and the power is turned off, and then the machine recovers, or if a double feed occurs when transporting the original M using the automatic document feeder 1a, the next time the automatic document feeder 1a is used. When copying is done with
The document M remaining on the platen 3 is conveyed downstream in the document conveyance direction and is discharged out of the machine from the discharge window 25.

(c) Problems to be Solved by the Invention By the way, in the above-described document conveying device 1a, the platen 3
The document M left on the document M may be attracted to the conveyor belt 20 due to frictional electrification and become caught between the conveyor belt 20 and the cover 23 covering the belt 20 . Also,
If an object is placed near the ejection window, the document ejected from the window will be blocked by the object.
The document was caught between the conveyor belt and the cover and was difficult to take out.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an automatic document conveying device that discharges the document caught between the conveyance belt and the cover to the outside of the device.

(:) Means for Solving the Problems The present invention has been made in view of the above-mentioned circumstances. For example, referring to FIG. 1(a), a document (M) is placed at a document processing position (3) A conveyor belt (20) stretched across two rollers (21, 22) that convey the conveyor belt (20)
0), the automatic document feeder (1) includes a protective member (23) that covers the two rollers (21, 22).
), a pressure roller (35) that presses into contact with the conveyor belt (20) provided near the roller (22) on the tip side.
), and a discharge port (36) opened at a position of the protection member (23) facing the pressure roller (35).

(f) Operation Based on the above-described configuration, the original (M) is transported to the original processing position (3) by the transport belt (20) and processed. In addition, when the original (M) is attracted to the conveyor belt (20) and conveyed between the conveyor belt (20) and the protection member (23), the original (M) is attached to the pressure roller (35). The winding of the conveyor belt (20), which changes depending on the curvature, is discharged from the discharge port (36).

Note that the above-mentioned symbols are shown for reference and do not limit the configuration in any way.

(F) Examples Examples of the present invention will be described below with reference to the drawings.

Note that the same parts as those described above are given the same reference numerals and the description thereof will be omitted.

As shown in FIG. 1(a), the automatic document conveyance device l has a pressure roller 35 in pressure contact with the conveyor belt 2o near the driven roller 22, and also has a pressure roller 35 in pressure contact with the conveyor belt 2o.
A discharge port 36 is provided at a position close to the discharge port 5.

The discharge port 36 is located at one edge 2 of the cover 23 adjacent to the discharge port 36, as shown in detail in FIG. 1(b).
3a is lower than the top of the driven roller 22, and the edge 23a constitutes a paper discharge guide.

Next, the operation of this embodiment will be explained.

When a document M is placed on the document tray 5 and a start key (not shown) is pressed, the partition member 7 rotates and rides on the uppermost document to distinguish unprocessed documents from processed documents.

At the same time, the paper feed roller 5 starts rotating, the weight 10 descends, and the stopper 11 retracts to press the document M against the paper feed roller 9. As a result, the manuscript M
are fed to the nip between the conveyance roller 15 and the separation belt 13, the leading edge of which is removed by the separation plate 12, and then separated one by one by the roller 15 and the belt 13, leaving only the lowest document M. It is conveyed to a pair of registration rollers 19. Then, the document M comes into contact with the pair of rollers 19 to form a loop. At this time, the guide 17 moves to the position shown by the dashed line (see FIG. 1) to allow the document M to form a loop. Then, the document M is conveyed between the platen 3 and the conveyor belt 20 by a registration roller pair 19 that starts rotating at a predetermined timing, and the image is read by a copying section (not shown) of the copying machine 2. Furthermore, after the reading is completed, the document M is conveyed to the left by the conveyor belt 20, passes through the paper discharge path 27, and is conveyed to a pair of paper discharge rollers 30, where it is stacked on the document tray 3 by the pair of rollers 30. The document M is ejected to the top. Then, document tray 5
Copying of the unprocessed originals M stacked on the machine is sequentially performed by the same operation as described above.

Further, in the case of a double-sided document, the document M whose image on the first side has been read by the same operation as described above is conveyed to the left by the conveyor belt 20, and guided by the flapper 32 from the paper ejection path 27 to the reversal path 31. . Then, the document M comes into contact with the pair of registration rollers 19 to form a loop, and the skew is corrected. Then, the document M is conveyed between the platen 3 and the conveyor belt 20 by a pair of registration rollers 19 that start rotating at a predetermined timing, and the image on the second side is read by the same operation as described above, and the image is transferred to the document tray 5. is discharged to.

By the way, if an operator performs a copying operation by placing a document M on the platen 3 by hand without using the automatic document feeder 1, and uses the document feeder L with the document placed on the platen 3, When the document M is fed from the document tray 5 using the same method, the document M left on the platen 3 is conveyed to the right by the belt 20 when the conveyor belt 20 rotates in the same manner as described above, and is ejected from the ejection window 25. be done. At this time, if the document M is attracted to the conveyor belt 20 due to frictional charging or the like, the document M is conveyed between the cover 23 and the conveyor belt 20, and the winding of the conveyor belt 20 is caused by the curvature.
When the leading edge of the document M comes off from the belt 20, the document M
is scooped up by the edge 23a of the cover 23 and discharged from the exhaust port 36 to the outside of the machine.

In addition, when the automatic document feeder 1 is in use and the document M is placed on the platen 3, the copying machine 2 may experience a paper jam or an electric current.
If an FF occurs and the paper jam is cleared or the power is restored, or if a double feed occurs when the document M is transported by the document transport device 1, the next time the document M is transported by the document transport device 1, the platen When the original M placed on the platen 3 or the original M to be transported to the platen 3 first is transported between the cover 23 and the transport belt 20 by the same operation as described above,
The document M is discharged from the discharge port 36 by the same operation as described above.

In the above-mentioned embodiment, the pressure roller 35 is arranged at a position where the winding angle of the conveyor belt 20 increases, but the present invention is not limited to this, and as shown in FIG. The pressure roller 35 may be disposed at a position where the pressure roller 35 is changed. If this is done, the curvature of the conveyor belt 20 becomes sharply smaller at the pressure roller 35 portion, so that the document M is more easily peeled off than the conveyor belt 20.

(G) As described in detail, according to the present invention, the document caught between the conveyor belt and the protective member is discharged from the discharge port, so that the document caught between the conveyor belt and the protective member is It is possible to eliminate the trouble of ejecting the original document that has been caught up in the document from the ejection port and taking out the original document from between the conveyor belt and the protection member.

[Brief explanation of the drawing]

FIG. 1(a) is a front sectional view showing an automatic document feeder according to the present invention, and FIG. 1(b) is a front sectional view showing the main parts thereof. Moreover, FIG. 2 is a front sectional view showing another embodiment of the present invention. Furthermore, FIG. 3 is a front sectional view showing a conventional example. 1, la”・Automatic document conveyance device 3...Document processing position 20...Conveyor belt 21
．． 22...Roller 23...Protective member 35...
・Pressure roller 36...Discharge port M...Document

Claims (1)

[Scope of Claims] 1. An automatic document conveying device comprising: a conveyance belt stretched between two rollers that conveys a document to a document processing position; and a protective member that covers the conveyance belt; The protective member is characterized by comprising: a pressure contact roller that is provided in the vicinity of the leading end roller of the rollers and presses into contact with the conveyor belt; and a discharge port that is opened at a position facing the pressure contact roller of the protection member. Automatic document transport device.