JPS6236940B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to an automatic document feeder for a copying machine for feeding sheet documents one by one onto a platen of a copying machine.

Prior Art This type of document feeder is conventionally known as an automatic document feeder that stacks a stack of documents on a paper feeder and feeds the documents one after another based on commands from the copying machine main body. be. Conventionally known devices of this type have little tolerance for document size, paper thickness, and paper quality, and especially when different types of documents are mixed, the reliability of document feeding becomes extremely poor. Particularly in those equipped with a document reversing device, jams are likely to occur in the document reversing device.

An object of the present invention is to provide an apparatus that eliminates the above-mentioned drawbacks of conventional automatic document feeders, efficiently processes many types of documents, and conveniently performs post-processing of jams generated in a document reversing device. With the goal.

Structure This purpose is to provide a device portion that forms a cover of a document reversing device that is provided extending in the paper discharge direction at the paper discharge position of the document feed endless belt that transports the document onto the platen of a copying machine. This is achieved by making it openable.

Embodiments of the invention will be described below with reference to the accompanying drawings.

In FIG. 1, an automatic document feeder 2 constructed according to the present invention is mounted on a copying machine 1. The automatic document feeder 2 includes an automatic document feeder that automatically feeds stacked sheet documents one by one onto the platen 3 of the copying machine 1, and a manual feeder for manually feeding sheet documents one by one. a paper table 4; a document feed belt 5 that supplies the document from the automatic document feeder onto the platen 3 and serves as a pressure plate during exposure;
The document reversing device includes a document reversing device for reversing the document in order to copy both sides of the document.

The above-mentioned automatic document feeding section consists of an automatic document feed tray 6 that stacks sheet documents, a duct belt 7 that feeds sheet documents stacked on this tray one by one from the top side, and an inverter that cooperates with this duct belt. It is equipped with a stop roller 8. The non-return roller 8 moves slightly so as to rotate in the opposite direction to the running direction of the duct belt 7, and when two sheets of paper are picked up, it blocks the feeding of the lower one and prevents overlapping feeding. Has a function.
A relay device consisting of a relay roller 9 and a guide plate 10 is provided following the automatic document feeder.
This relay device functions to relay the original from the automatic original feeding section to the original feeding belt 5.

The document feed belt 5 is wrapped around a drive roller 11 and guide rollers 12, 12, and rotated along the platen 3 of the copying machine 1 in the direction of the arrow. The stopper 13 is a plate-shaped member that is pressed by the document feed belt 5, and stops the leading edge of the document fed by the document feed belt 5 at this position, and after the exposure operation is completed, retreats downward to prevent the document from passing. It has a function that allows

A manual paper feed roller 14 is provided on the manual paper feed table 4 and serves to feed manually inserted originals to an automatic document feeding system. The first paper feed roller 14 is
A gate 15 and a roller 15A attached to the gate 15 that cooperates with a feed roller 19 to be described later, and further behind the first gate a second gate 16 and a roller 16A attached thereto that cooperate with the document feed belt 5 are arranged. Each of these gates serves to appropriately switch the paper feed path according to the required copy mode, as will be described later.

The document reversing device includes a document reversing belt 17, onto which a double-sided document is fed to be reversed. In this case, the first gate 15 is located at the position indicated by the broken line, and the document whose first side has been exposed reaches the document reverse feed belt 17 via a pair of feed rollers 18 and 19. The document reverse feed belt 17 is driven at low speed in the direction of refeeding the document that has reached the top thereof, and has the function of placing the document placed thereon by its own weight and sending it in the reverse direction. In the case of this function, it is preferable that the original reverse feed belt 17 is in the position shown by the broken line. When only one side of a document is to be copied, the document feed/reverse belt 17 serves as a one-sided document holder on which the copied documents can be stacked. At this time, the original reverse feed belt 17 is not driven to the low position shown by the solid line but remains stationary.

Above the document feed belt 5 is a double-sided document tray 20.
is arranged, and a pair of discharge rollers 21 is provided at the entrance thereof. When used documents accumulate on the document holder 20, the automatic paper feed tray 6 can be flipped up to take out the documents. Original reverse feed belt 1
When single-sided originals accumulate on 7, the manual feed tray 4
Flip up or remove it to remove the original. or,
When a jam occurs in the document reversing device, the manual paper feed table 4 can be similarly flipped up or removed, and the jammed document on the document reversing belt 17 can be taken out.

When performing single-sided copying of originals stacked on the automatic paper feed tray 6, as shown in FIG.
The gate 15 is in the raised position (the position indicated by the broken line in FIG. 1). The originals sent out one by one by the duct belt 7 reach the platen 3 of the copying machine 1 by the relay device and the original feeding belt 5, and are positioned by the stopper 13 and copied. Next, the document feed belt 5 and the feed roller pair 18, 19
The original is ejected onto the reverse feed belt 17.

When a single-sided original is manually fed, the original reverse feed belt 17 and the first gate 15 are in the position shown in FIG. 2, and the second gate 16 is also in the raised position shown in FIG. The document fed from the manual paper feed roller 14 is fed to the roller pair 15A,
19, the roller 16A, and the document feed belt 5, the document reaches the document feed belt 5, is thereby sent onto the platen 3, and is ejected onto the document reverse feed belt 17 after being copied as described above.

When making double-sided copies of originals stacked on the automatic paper feed tray 6, the first gate 15 and the second gate 16 are initially in the positions shown in FIG. 2, and the original reverse feed belt 17 is in the position shown in FIG. It is located in a high position and is driven at low speed. The original that has reached the platen 3 by the relay device and the original feed belt 5 and has been copied on one side is ejected onto the original reverse feed belt 17, but since this belt 17 is being driven in the direction of the arrow, it will not be printed again. The document is sent back, and at this time, it reaches the document feed belt 5 via the roller pair 15A, 19, the roller 16A, and the document feed belt 5, and is thereby sent onto the platen 3 again. In this case, the original reaches the platen 3 in an inverted state compared to the first case, and the opposite side is copied. Since the first gate 15 and the second gate 16 have been switched to the solid line position and the broken line position shown in FIG.
1, the original documents are discharged onto the double-sided document tray 20, and stacked there.

When manually feeding double-sided originals, the first gate 15 and the second gate 16 are initially in the positions shown in FIG. 2, and the original reverse feed belt 17 is in the high position shown in FIG. Same as example. For manually feeding originals, feed roller 14, roller pairs 15A, 19
The document reaches the document feed belt 5 via the roller 16A, and is thereby sent to the platen 3. The rest is the same as described in the previous example.

In the embodiment shown in FIG. 4, the positions of the manual paper feed tray 4 and the automatic paper feed tray 6 are exchanged, and accordingly, the manual paper feed roller consists of a pair of rollers 22, 22, and the automatic paper feed tray 6 is Duct roller 23
is located. It is also rotatable around the pivot portion 24. Therefore, by rotating the tray 6 upward around the pivot portion 24, the original reverse feed belt 17 is brought into an open state. The functionality of this embodiment is the same as the first embodiment shown in FIGS. 1-3.

When copying documents that cannot be automatically fed or semi-automatically manually, such as thick paper, thin paper, or books, flip up the automatic document feeder itself to release the platen, and then use the method described above. Of course, you can place your manuscript there.

In the first embodiment shown in FIGS. 1 to 3 and the second embodiment shown in FIG. 4, the document reversing belt also serves as a single-sided document holder, but this is not always necessary. By switching the first and second gates, it is possible to discharge even a single-sided original onto the double-sided original platen 20.

As described above, the automatic document feeder according to the present invention selects the most reliable copying method according to the type, size, thickness, and presence or absence of folds of the document to be copied due to the way the file is laid out. I can do it. For example, for large documents, use the manual feed tray.
When copying documents that are not large in size but have a large number of sheets, stacking them on the automatic paper feed tray will improve operational efficiency. Furthermore, when a jam occurs in the document reversing device, the jammed document can be easily removed by flipping up or removing the manual feed table or paper feed tray that forms the cover of the document reversing device.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of an automatic document feeder according to the present invention, FIGS. 2 and 3 are diagrams for explaining the operation of the same apparatus, and FIG. 4 is a diagrammatic explanatory diagram of a second embodiment of the present invention. It is. 1... Copy machine, 2... Automatic document feeder, 3...
...Platen, 4...Manual feed tray, 5...Document feed belt, 6...Automatic feed tray, 14...Manual feed roller, 17...Document reverse feed belt.

Claims (1)

[Scope of Claims] 1. In an automatic document feeder for a copying machine, a paper feed tray 6 on which sheet documents are stacked and placed; an automatic paper feed mechanism 7, 8 that feeds out the stacked documents one by one; A document feeding endless belt 5 transports the original onto the platen 3 of the copying machine for exposure: The document is placed at the paper ejection position of the document feeding endless belt 5, and after one side of the original has been copied, the document is reversed and the document feeding endless belt 5 is moved again. A document reversing device 17 that forms a cover of this document reversing device and serves as a paper feed tray for manually feeding sheet documents is provided, and the reversing device is also used as a paper output tray when making one-sided copies. Thing: An automatic document feeder characterized by the following. 2. The automatic feeding device according to claim 1, wherein the device portion is openable.