JPS63160942A - Automatic original feeder - Google Patents

Abstract

PURPOSE:To make up a feeder to be so thin as well as to miniaturize it, by installing a paper feed tray in one side of a platen and also an original passage device in the other side, forming the feeder into a thin type, and performing such a job that turns over both sides of an original and puts it back to the paper feed tray with a selector device is the point midway in the same original passage device. CONSTITUTION:A paper feed tray 5 is installed in one side of a platen 1 and also an original passage device consisting of a roller 10, a turnover drum 11 and a pinch roller 9 in the other side, respectively, forming a feeder into a thin type low in height, and such a job that turns over both sides of an original and puts the original back to the paper feed tray 5 is constituted so as to be carried out with the selector claw 12 installed in the point midway in the same original passage device. And, such a conveying system that feeds the original at the lower side of an endless conveyor belt 2 and discharge it at the upper side is used in combination. Therefore, the original is fed to the platen 1 almost rectilinearly without being curved from one side of the platen 1, and it is discharged in a way of utilizing an upper part of the conveyor belt 2, so that a feeder can be thinly constituted and, what is more, miniaturizable.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an automatic document feeder that feeds and conveys a sheet document to an exposure section of a copying device, and in particular, the present invention relates to an automatic document feeder that feeds and conveys a sheet document to an exposure section of a copying device, and in particular, by repeatedly copying a document into pages. The present invention relates to an automatic document feeder having a function of copying a plurality of copies in the order of a plurality of pages, a function of automatically copying both sides of a document, and further having one or both of these functions.

Conventional Technology In recent years, as the demand for copying devices has increased, it has become possible to create multiple copies of copy sheets in the order of their pages without using a device called a sorter. There are conventional automatic document feeders and reversible automatic document feeders that invert a document and send it to a platen in order to copy both the front and back sides of the document. There are also devices that combine these functions and have both functions.

An example of the conventional automatic document feeder described above will be described below with reference to the drawings.

FIG. 3 shows a front view of a conventional copying machine system, in which the figure A shows a circulation type copying machine 21 equipped with an automatic document feeder 22, and the front figure shows a combination of circulation type and reversal type. Note that 23 indicates a paper feed tray.

When copying, when using the automatic document feeder, the user places the document on the paper feed tray 23 and performs the copying operation, but when copying a book or a multi-sheet document, the user does not use the automatic document feeder. Move the platen open and perform copying operations.

Problems to be Solved by the Invention However, copying machines are generally designed and installed at an optimum height for the user.

This is because in the case of a book document, the automatic document feeder is used open from the platen, and the copying operation section is disposed on the top surface. As mentioned above, in the circulation type, the document is placed on the top of the automatic document feeder, and the document is fed from the bottom of the document and ejected to the top of the original document, so the document feeder is connected to the document feeder. Each discharge section requires a curved passage,
As a result, the device was larger. Further, in combination with the reversing type, a reversing section is required to switch and reverse the front and rear ends of the document, which results in a large size and a high document placement surface as described above.

Increasing the size of the automatic document feeder itself is extremely inconvenient for use, especially for books that cannot use the document feeder or documents that are bound in multiple copies. Place the original, but
It is a pain for the operator to open and move large document feeders, and these copies are typically made frequently. In addition, a type that combines a circulation type and a reversal type employs a method of switching back the original, resulting in an extremely low copying speed. Furthermore, there were other drawbacks such as a complicated structure.

Means for Solving the Problems In order to solve the above-mentioned problems, the automatic document feeder of the present invention is a thin, low-height device that has a paper feed tray on one side of the platen and document passage means on the other side. This apparatus has a configuration in which the switching means provided in the middle of the same original passage means performs the operations of reversing the original from front to back and returning the original to the paper feed tray.

According to the present invention, with the above-described configuration, the original is fed into the platen from one side of the platen in a substantially straight line without being curved, and the upper part of the conveyor belt is used for ejection. This means that the transport system can be made extremely thin.

Embodiment Below, an automatic document feeder according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of an automatic document feeder according to an embodiment of the present invention. Reference numeral 1 denotes a platen glass of a copying machine, and the lower side of an endless conveyor belt 2 is in contact with the upper side of the platen glass.

This conveyor belt 2 is driven by a pair of tensile rollers 3 driven by a motor (not shown), and its lower surface is brought into sliding contact with the platen glass 1 by a pair of presser rows 24.

Reference numeral 6 denotes a paper feed tray, and 6 a separation roller that works together with a feed roller 7 to send only the bottommost sheet of multiple documents to the feed roller 8.
feed paper. A pinch roller 9 works together with the feed row 28.1o, the reversing drum 11, and the conveyor belt 2 to feed the document.

Reference numeral 12 is a switching claw for switching the direction in which the document is guided. Reference numeral 13 denotes a pair of paper discharge a-ra for returning the exposed original to the paper feed tray 5.

The separation row 26, the feed roller roughs 8, 10, and 14, the paper discharge roller 13, the reversing drum 11, and the conveyor belt 2 are each driven by a motor (not shown).

16, 17, 18 and 19 are document guide walls or guide plates.

Next, the operation will be explained with reference to FIG. First, when copying one side of a document, place the document 2° on the paper feed tray 5 in page order with the side to be copied facing upward and the last page at the bottom, as shown in Figure 2-1. . When the start switch is pressed here, the bottom document 2o-1 is moved to the right by the feed roller 14, separated into only one sheet by the separation roller 6 and the feed roller rough, and further moved to the right by the feed roller 8. It enters between the conveyor belt 2 and the platen glass 10 and is moved onto the platen by the conveyor belt 2. The manuscript does not stop here, but moves further to the right as shown in Figure 2-
2, it passes along the outer periphery of the reversing drum 11 by the feed roller 1o and returns to the lower surface of the conveyor belt 2 by the feed row 210 under the guidance of the switching pawl 12 which is switched by a renoid (not shown). At this time, the original 20-1 is reversed, so the side to be copied is on the lower side, that is, on the platen glass 1 side, and the document 20-1 is placed at a predetermined position on the platen glass 1 as shown in Fig. 2-1.
It stops like this. Next, at this position, the original 2o-1 is exposed and copied. After that, the document 2°-1 is moved to the right by the conveyor belt 2, the feed row 1o, and the reversing drum 11, and is further reversed. At this time, the direction of the switching claw 12 is changed, and the conveyor belt 2. At this time, the lowermost document 2o-2 remaining on the paper feed tray 5 is moved by one sheet to the right by the feeders a-714, 7, 8 and the separation row 26, and reaches the platen glass 1.

Furthermore, as shown in FIG. 2-4, the original 2o-1
The document 20-2 is returned above the document 2o on the paper feed tray 5, and at the same time, the document 20-2 is reversed by the reversing drum 11, reaches a predetermined position on the platen glass 1, stops, and is exposed. In this way, the original 20 is sequentially exposed to light starting from the last page and copied by the copying machine.

Even after all pages have been copied, the original 2o is repeatedly circulated in the above order until the desired number of copies have been copied.

Next, the case of copying both sides of the original 20 will be described. The original 20 is placed on the paper feed tray 6 so that the front side of the first page faces upward, the last page faces the bottom, and the back side faces downward. When the start switch is pressed here, the bottom document 20-1, which is the last page, is moved to the right by the feed roller 14, separated into only one sheet by the separation row 26 and the feed sheet a-27, and then the document 20-1, which is the last page, is moved to the right by the feed roller 14, and separated into only one sheet by the separation row 26 and the feed sheet a-27. 8, the platen glass 1 is moved further to the right by the conveyor belt 2 as shown in Fig. 2-1.
It moves to a predetermined position above and stops. Here, manuscript 2o-
The back side of 1 is exposed and copied.

Thereafter, the document 20-1 is moved to the right by the conveyor belt 2, further guided by the reversing drum 11 to the switching claw 12, and its leading end returns to the lower surface of the conveyor belt 2, as shown in FIG. 2-2. At this time, the conveyor belt 2 moves in the opposite direction to
As shown in Figure 1, it reaches a predetermined position on the platen glass 1 and stops. Here, since the original 20-1 is inverted, its front side faces the platen glass 1, and in this state it is exposed and copied. Thereafter, the original 2o-1 is moved to the right by the conveyor belt 2, the feed roller 210, and the reversing drum 11 and is further reversed. At this time, the direction of the switching claw 12 has changed and the second
It is guided above the conveyor belt 2 as shown in Figure 6. Thereafter, the lowermost document 2O-2Ifi remaining in the paper feed tray 6 starts moving to the right by the feed row 214. Furthermore, manuscript 2o
-1 is the document 2 on the paper feed tray 6 by the paper ejection row 213.
At the same time, the original 2o- is returned to above 0 as shown in Figure 2-4.
2 is separated into one sheet by the separation row 26, the feed row 27.8, and the conveyor belt 2, and when it reaches a predetermined position on the platen glass 1, it is stopped and exposed. In this way, the original 2o is exposed and copied in order from the back side of the last page to the front side. Further, even after the front side of the first page has been copied, the original 2o is repeatedly circulated in the above order until the desired number of copies have been copied. Since the pages are sequentially fed from the last page to a predetermined position on the copying machine's platen, copied, and stacked in the same order on the paper feed tray, they can be fed repeatedly. A typical copying machine has a paper ejecting structure called face-up, in which the first copied copy sheet faces upward and the next copy sheet is placed on top of it, so when combined with the automatic document feeder of the present invention, the original Not only does the page order of the copy sheet match the page order of the copy sheet, but also the page order of the copied original, and since the device can be made thin, it is easy to operate when combined with a copying machine.

According to the present invention, the paper feed tray is provided on one side of the platen substantially in a straight line with the platen, so that the document placement surface is lowered and operability is improved.

Furthermore, by combining the conveyance system that feeds originals on the lower side of the endless conveyor belt and ejects the originals on the upper side, the structure can be made much thinner than before, and the reversing mechanism can be attached to the platen. By extending it laterally, the document can be conveyed smoothly, and the device can be made thinner and more compact.

Further, the automatic document feeder of the present invention has a simple structure, high reliability, can be manufactured at low cost, and has many advantages such as high copying speed.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional configuration diagram of an automatic document feeder according to an embodiment of the present invention, FIG. 2 is a diagram for explaining the movement of the document in FIG. 1, and FIG. 3 is a diagram showing a conventional automatic document feeder. FIG. 3 is a front view of the device attached to a copying machine. 1...Platen glass, 2...Transport belt, 6...Paper feed tray, 11...Reversing drum, 12...Switching claw , 13...
Paper discharge count - LA, 2o... Manuscript.

Claims (2)

[Claims] (1) A paper feeding unit that feeds originals onto the platen from a paper feeding tray that is provided on one side of the platen and that can store a plurality of originals, and a paper feeding unit that is provided on the other side of the platen that feeds originals from the paper feeding tray. a loop-shaped document passage means that allows a document that has passed through the platen to be conveyed onto the platen again; a conveyance means that conveys the document on the platen to the paper feed tray side or the opposite side; and the platen. a paper discharging means for discharging the exposed original onto the paper feed tray while passing through the document passage means; An automatic document feeder characterized in that it has a switching means for selectively guiding the document. (2) An endless conveyor belt is provided on the platen, and the lower side of the conveyor belt conveys the document onto the platen,
2. The automatic document feeder according to claim 1, wherein the upper side also serves as a part of the paper ejecting means.