JPH0432859A - Method and device for feeding original - Google Patents

Abstract

PURPOSE:To overlap the trailing edge of a preceding original and the leading edge of an original next fed without interference and to accomplish overlapped feeding by overlapping the trailing edge of the preceding original and the leading edge of the original next fed at a specified position on the front side of a carrying part and feeding them at the same time. CONSTITUTION:This device is provided with a guiding means 29 for preventing the interference of the trailing edge of the preceding original with the leading edge of the original next fed on the front side of resist rollers 30 and 31. When the specified amount of the trailing edge of the preceding original remains on the front side of the rollers 30 and 31, the rollers 30 and 31 are temporarily stopped and the original next fed is overlapped on the remaining part of the preceding original to butt against the rollers 30 and 31, then they are overlapped and fed at the same time. Thus, the feeding in a state where the trailing edge of the preceding original and the leading edge of the original next fed are overlapped is accomplished and the mutual positional relation between both originals is freely controlled thereafter, and the obliquely feeding is prevented from occurring by the mutual interference of the edges of the originals.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a document feeding method and a device therefor, and in particular, the present invention relates to a document feeding method and device thereof, and in particular, the present invention relates to a document feeding method and device thereof, and in particular, by feeding document documents one after another onto a platen of an image forming apparatus, and by feeding multiple document documents at the same time or document feeding device. Each item is subject to exposure processing.

[Prior art] In recent years, in order to secure the storage space for the increasing number of documents,
In order to make it possible to copy a single sheet of original as a single copy, a feeding method known as the so-called two-in-one method or continuous feeding method is used, in which multiple sheets of original are arranged on a platen and exposed at the same time. There is.

Therefore, in order to feed multiple originals onto the platen of an image forming apparatus, it is desirable to be able to freely control the relative positions of the preceding original and the next original. It is required to be delivered.

Conventionally, for this purpose, in a registration roller provided between the separation section and the conveyance section of the device, the rear end of the preceding document is positioned in the pressure contact section of the registration roller, and then the subsequent document is placed in the registration roller. The two documents are brought into contact with the registration rollers, and then fed onto the platen while remaining in contact with each other.

[Problems to be Solved by the Invention] However, in such a conventional method, it is not possible to overlap the trailing edge of the preceding document and the leading edge of the next document, and even in the best case, it is not possible to feed the trailing edge of the preceding document and the leading edge of the next document without any gaps. In most cases, some gap is created during conveyance, and the gap between two documents cannot be adjusted when copying between two documents.

Moreover, on the contrary, the edges of both documents may interfere with each other during conveyance, causing skew feeding.

[Object of the Invention] The present invention has been made in view of the problems in the conventional technology, and provides a so-called two-in-one document feeding method and device in which the trailing edge of the preceding document and the subsequent document are separated. It is possible to feed the leading edge of the original in an overlapping manner, thereby providing the possibility of freely controlling the mutual positional relationship between the two originals, and furthermore, it is possible to feed the original without causing skew feeding due to interference between the edges of these originals. The purpose of this invention is to provide a method and device for the same.

[Means to solve the problem]

These purposes are as follows: (1) In a document feeding method in which a plurality of documents separated into one sheet are sent one after the other onto a platen of an image forming apparatus and the plurality of documents are subjected to exposure processing simultaneously or individually. . A method of feeding a document, in which the trailing edge of the preceding document and the leading edge of the next document are overlapped and fed simultaneously at a predetermined position in front of the conveyance section.

(2) In a document feeding device that sends multiple documents separated into one sheet one after the other onto the platen of an image forming device and exposes the multiple documents simultaneously or individually, one document is a separation unit that separates the original into two parts; a registration roller that abuts the leading edge of the original to adjust its posture and time the feeding; and a transport unit that transports the original onto the platen, and includes at least the registration roller and the transport unit. is equipped with an individual variable speed drive means, and overlaps a predetermined amount of the trailing edge of the preceding document with the leading edge of the next document in front of the conveying section, and feeds the document in an overlapping manner to P[. A document feeder equipped with a control device.

(3) The registration rollers are temporarily stopped with the trailing edge of the preceding document remaining in front of the registration rollers, and the trailing edge of the preceding document remaining in front of the registration rollers is transferred to the next document. A guiding means is provided on the front side of the registration roller 2 for overlapping the leading edge portions of the original documents and abutting them against the registration rollers to simultaneously feed the original documents in an overlapping manner, and for preventing interference between the trailing edge portions of the preceding document and the leading edge portions of the next document to be fed. Document feeding device as described in section.

(4) Immediately after the trailing edge of the preceding document passes through the registration rollers, the conveying section is temporarily stopped, and when the next document overlaps a predetermined amount of the trailing edge of the preceding document, the conveying section is conveyed. In order to restart the unit and feed both documents in an overlapping manner, and to prevent mutual interference during forming, a stepped portion is provided immediately after the registration roller to lower the rear portion of the document. document feeder.

(5) The next document is temporarily stopped at the position where a predetermined amount of the leading edge of the next document comes out of the registration roller, and at the same time, the preceding document is reversely fed so that the trailing edge of the preceding document and the next document are separated. The tip protruding from the registration roller is overlapped, and then both documents are fed in an overlapping manner, and when the trailing edge of the preceding document and the leading edge of the next document overlap, they are prevented from interfering with each other. 3. The document feeding device according to item 2, further comprising guide means for guiding a trailing edge of the preceding document that is being fed backwards, immediately after the registration roller.

This can be achieved by

[Function] In an original feeding method in which a plurality of originals are fed one after the other and exposed on the platen of an image forming apparatus simultaneously or for each original, the method of the present invention is applicable to the method of the present invention. At a predetermined position, the trailing edge of the preceding document and the leading edge of the next document are overlapped by a predetermined minute amount to enable overlapping feeding.

In this feeding method, a guide means is provided in front of the registration roller to prevent interference between the trailing edge of the preceding document and the leading edge of the next document, and a predetermined amount of the trailing edge of the preceding document is aligned with the registration roller. When the document remains in front of the roller, the registration roller is temporarily stopped, and the next document is superimposed on the remaining portion of the preceding document and abuts against the registration roller,
Thereafter, in the document feeding device configured to simultaneously feed the documents in an overlapping manner, the preceding document is temporarily stopped with a predetermined amount t11100 of the document size stored in the control device remaining on the upstream side of the registration roller. Then, the subsequent original is abutted against the registration rollers while being guided by the interference-preventing guide means.

Then, when the rear part of the next document is sufficiently curved and its posture is adjusted, the preceding document and the next document are simultaneously fed toward the conveying section with their ends overlapped.

In the feeding method of the present invention, in order to prevent mutual interference when the trailing edge of the preceding document and the leading edge of the next document overlap, the trailing edge of the document is dropped immediately after the registration roller. Immediately after the trailing edge of the preceding document passes the registration roller, the conveying section is temporarily stopped so that the next document overlaps a predetermined amount of the trailing edge of the preceding document. In an apparatus configured to restart the conveying section at the position where the original document is placed and feed both original documents in an overlapping manner, the preceding original passes through the registration rollers and falls into the stepped portion, where it temporarily stops. Then, this time, the next document starts to advance from the registration rollers, and when it has advanced by a predetermined amount of overlap, the conveying section is activated again, and both documents are sent in an overlapping manner. Moreover, since the trailing edge of the preceding document falls on the stepped portion as described above, and the next document advances from above, there is no interference between the trailing edges of the preceding document and the next document.

In the method of the present invention, when the trailing edge of the preceding document and the leading edge of the next document overlap, the trailing edge of the preceding document is guided immediately after the registration roller to prevent interference with each other. A guide means is provided to temporarily stop the next document at a position where a predetermined amount of the leading edge of the next document comes out of the registration roller, and at the same time, reversely feed the preceding document to move the trailing edge of the preceding document. In the feeding device configured such that the protruding leading edge of the next document overlaps with the protruding leading edge of the next document, the trailing edge of the document moving backward after passing the guide means avoids the leading edge of the next document by the guiding device. Because it can be avoided upwards or downwards,
The trailing edge of the preceding document and the leading edge of the next document can overlap without interference, and when a predetermined overlap occurs, both documents begin to advance together.

[Example 1] FIG. 1 is an overall view of a first embodiment of a document feeding apparatus implementing the feeding method of the present invention, and FIG. 2 shows the main parts thereof.

The document feeding device 10 is placed on the upper surface of the platen P of the image forming apparatus C, and includes a document tray 11 on which a document is placed, a paper feed section 20 that separates the document into one sheet and feeds the document, and a document feeder 20 that separates the document into one sheet and feeds the document.
Conveying unit 40 that conveys upward and positions it. It consists of a discharge section 50 for discharging R-lighted documents, a discharge tray 12 for collecting discharged documents, and the like.

The paper feed section 20 includes a pickup roller 21 that contacts and feeds out the bottom paper of the stacked originals, a weight leaf spring 22 that presses the top paper, a separation roller 24 that contacts and separates the bottom paper, and blocks the second and subsequent papers. It is composed of a separation pad, a/do 25, registration rollers 30.31, etc., and furthermore, as shown in FIG. 2(a), the trailing edge of the document is curved between the separation roller 24 and the registration rollers 30. A reversal space 28 is constituted by an outer guide plate 26 and an inner guide plate 27.

Further, the registration rollers 30 and 31 are variable drive rollers M
The transport unit 40 is connected to the OT I, and the transport unit 40 is connected to the downstream side thereof.
An introduction path 33 is provided for guiding the original to just before.

A size sensor 3 detects the document size by detecting the front edge and rear edge of the document through the reversing space 28.
2 are arranged.

Furthermore, as shown in the figure, the outer guide plate 26 is provided with two guide means for preventing the trailing edge of the preceding document and the leading edge of the next document from interfering with each other.

The conveyance section 40 is connected to a variable speed MOT II, and consists of a conveyor belt 43 extending between a pair of belt rollers 41 and 42.
A plurality of press rollers 44 are arranged on the platen side of the conveyor belt 43.

The discharge section 50 has a discharge guide 51 around the discharge roller 52.
and a reverse feed guide 54, and a switching claw 53 is provided for switching between ejecting the exposed original as is or inverting and transporting the exposed original in reverse for copying the back side.

The feeding device 10 is equipped with a control device (not shown), and its operation will be explained in the following operation description.

Next, the operation will be explained with reference to the flowcharts in FIGS. 2(b) and 3.

In this type of document feeding device 210, either a single sheet feeding mode or a continuous feeding mode is normally selected, but here, multiple documents are simultaneously fed to an image forming apparatus (hereinafter referred to as
The case of so-called continuous feeding mode in which the image is sent onto the platen P of C (referred to as the main device) will be explained.

When the start button is pressed, the feeding device 10 starts feeding the first document according to a command from the main device C (Sl);
Subsequently, a separation operation is performed, and for the first time, the first document is separated into one sheet and sent (S2).

Next, the leading edge of the document is detected (S3), and if the leading edge is detected (S4), the trailing edge of the document is subsequently detected, and the timer TMI starts (S5), while the second document is fed out and separated (S
8. S9).

The first document is stopped once by the timer TMI up (S6, S7), and at this time, the rear end of the first document is at a position past the guide means 29 provided on the outer guide plate 26.

On the other hand, the timer TM2 starts when the leading edge of the 2N document is detected by the size sensor 32 (S10), and at that time up (Sll), it is sent by the conveyance section 40 together with the first document and stopped at the fixed position. , Each operation of simultaneous exposure processing of two sheets is performed (S12.13.14
).

While the timer TM2 is in operation, the leading edge of the second original runs on the guide means 29 and progresses as shown in FIG. 2(b).
) 195), the leading edge of the first document hits the registration rollers 3o and 31 without interfering with the trailing edge of the first document, and at the time of time-up, the leading edge of the first document overlaps with the trailing edge of the first document.
Further, the rear portion of the second document is largely curved into the reversal space ll128, and the oblique posture that may have occurred during separation is corrected.

Next, a second embodiment of a feeding device that implements the feeding method of the present invention will be described based on FIGS. 4(a) and 4(b).

In the feeding device 260 of the second embodiment, the preceding document is stopped immediately after exiting the registration rollers 30.31, and when the next document is pushed out of the registration rollers 30.31 by a predetermined amount, both documents are overlapped. It's about sending it.

In the above operation, the rear edge of the document is
．． Immediately after exiting 31, a stepped portion 61 into which the rear end portion falls is provided. The trailing edge of the preceding document extends along the introduction path 33 due to the rigidity of the document itself, and does not interfere with the leading edge of the succeeding document (see FIG. 4(b)).

Next, a third embodiment of a feeding device that implements the feeding method of the present invention will be described with reference to FIGS. 5(a) and 5(b).

In the feeding device 70 of the third embodiment, the registration roller 30
．． A guide means 71 is provided in the introduction path 33 immediately downstream of the guide means 31 as shown in the figure. This guide means 71 is made of a thin elastic material and is tilted forward, and allows the document to pass easily in the direction of travel, but guides the document toward its base in the opposite direction. , it is designed not to allow the progression to continue.

However, in operation, the previous original is moved to the registration roller 3.
When it reaches 0.31, it is temporarily stopped and then retreated by a predetermined amount. Then, the next document is transferred to the registration roller 3.
When the document exceeds a predetermined amount by 0.31, both documents are fed in an overlapping manner.

When the trailing edge of the preceding document is fed backwards, it is avoided by the guide means 71 to the upper side of the introduction path 33 as shown in FIG. 5(b), thereby preventing interference with the leading edge of the following document. do not have.

Further, the registration rollers and the conveyance section each have separate variable drive sources MOT1. Since it is driven by MOTn, by controlling the shape, it is possible to freely control the relative positional relationship between the preceding document and the next document. Note that the registration rollers and the conveyance section may be configured with one motor, and a variable speed clutch may be connected to either the registration roller length or the conveyance section.

[Effects of the Invention] As described above, according to the invention of claim 1, at a predetermined position in front of the conveyance section, the trailing edge of the preceding document and the leading edge of the next document are overlapped and fed at the same time. As a result, the trailing edge of the preceding document and the leading edge of the next document overlap without interference, and overlapping feeding is possible.

Further, according to the second aspect of the invention, since the registration rollers and the conveying section are each driven by separate variable drive sources, by controlling the shaping, the relative relationship between the preceding document and the next document can be adjusted. Tri! ! It is possible to freely control the wind.

[Brief explanation of drawings]

1 to 3 show a first embodiment of this invention,
Fig. 1 is an overall configuration diagram of the document feeding device, Fig. 2 (a) is a structural diagram of the main parts, Fig. 2 (b) is an explanatory diagram of the operation, Fig. 3 is a flowchart of the operation, and Fig. 4 ( a) is the second aspect of the present invention.
4(b) is an operational explanatory diagram, and FIG. 5(a) is a main M ellipse diagram of the third embodiment.
Figure (b) is also an explanatory diagram of the operation. 10 Document feeding device (first embodiment) 20 Paper feeding section 29 Guide means 40 Conveying section 60 Document feeding device (second embodiment) 61 Step section 70 Document feeding device (third embodiment) 71 Guide section MOT I Registration roller drive motor MOT
Transport unit drive motor

Claims (5)

[Claims] (1) In a document feeding method in which a plurality of documents separated into one sheet are sent one after the other onto a platen of an image forming apparatus, and the plurality of documents are subjected to exposure processing simultaneously or individually, the transport section A method for feeding a document, characterized in that the trailing edge of the preceding document and the leading edge of the next document are overlapped at a predetermined position in front and fed simultaneously. (2) In a document feeding device that sends multiple documents separated into one sheet one after the other onto the platen of an image forming device and exposes the multiple documents simultaneously or individually, one document is a separation unit that separates the original into two parts; a registration roller that abuts the leading edge of the original to adjust its posture and time the feeding; and a transport unit that transports the original onto the platen, and includes at least the registration roller and the transport unit. is a control device that includes an individual variable speed drive means and simultaneously overlaps and feeds a predetermined amount of the trailing edge of the preceding document and the leading edge of the next document in front of the conveying section. A document feeding device characterized by comprising: (3) The registration rollers are temporarily stopped with the trailing edge of the preceding document remaining in front of the registration rollers, and the trailing edge of the preceding document remaining in front of the registration rollers is transferred to the next feed. Guide means is provided on the front side of the registration rollers to overlap the leading edges of the originals and abut them against the registration rollers so as to simultaneously feed the originals in an overlapping manner, and to prevent interference between the trailing edge of the preceding original and the leading edge of the next fed original. The document feeding device according to claim 2, characterized in that: (4) Immediately after the trailing edge of the preceding document passes through the registration rollers, the conveying section is temporarily stopped, and when the next document overlaps a predetermined amount of the trailing edge of the preceding document, the conveying section is conveyed. In order to restart the registration roller and feed both documents in an overlapping manner, and to prevent interference with each other when the documents overlap, a stepped portion is provided immediately after the registration roller to drop the rear end of the document. 3. The document feeding device according to claim 2. (5) The next document is temporarily stopped at the position where a predetermined amount of the leading edge of the next document comes out of the registration roller, and at the same time, the preceding document is reversely fed so that the trailing edge of the preceding document and the next document are separated. The tip protruding from the registration roller is overlapped, and then both documents are fed in an overlapping manner, and when the trailing edge of the preceding document and the leading edge of the next document overlap, they are prevented from interfering with each other. 3. The document feeding apparatus according to claim 2, further comprising guide means for guiding the trailing edge of the preceding document being fed backwards, immediately after the registration roller.