JPS60232351A - Document feeder - Google Patents

Abstract

PURPOSE:To prevent damage of a document and to prevent the occurrence of a trouble caused by document feed by providing a cover plate for covering the surface of documents stored in a stack with detection means for detecting foreign matter in the documents to automatically detect the foreign matter. CONSTITUTION:A near-by switch 18 is connected in parallel to a detection circuit 19 along the frame portion of a cover plate 15. If a metal piece for stapling documents such as staples of a Hotchkiss is left behind in documents stored in a document storing receptacle, the near-by switch 18 near the staple 20 makes a contact point 181 when it senses the staple 20. Whereupon, the detection circuit 19 is closed, so that ''foreign matter'' is displayed on a display device 21 disposed in the circuit. According to the display, an operator stops a work and removes the staple 20 from the documents to prevent accidents such as damage of documents and the like. Corresponding to the operation of the display device 21, the operation of a copying machine may be automatically stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an original document feeder used in an image recording apparatus such as a copying machine or a facsimile machine that reproduces an image of an original onto another sheet of paper.

Conventional technology In image recording devices such as copying machines, the original is placed on the original supporting surface and processes such as copying are performed. For example, an automatic document feeder is provided that feeds the documents one by one onto a document support surface.

I would like to use this type of automatic document feed. -1・
In this case, the following problems are likely to occur. That is,.

The documents processed by the automatic document feeder are often one-size-fits-all documents that have been stored in various formats, and are often stapled together, for example. These binding hardware must be removed before loading the document into the automatic document feeder, but if they are not removed by mistake, the device will automatically feed the document one sheet at a time. As a result, various troubles occur such as damage to the original or abnormalities in the feeding of one original.

Problems to be Solved by the Invention The present invention improves the conventional automatic document feeder as described above, and provides an automatic document feeder that automatically detects if you forget to remove the binding metal fittings and notifies you when you open the document. The device is what you are trying to get.

Means and Function for Solving the Problems In order to solve the above problems, in the present invention, a cover plate is provided to cover the surface of the documents stored in a stacked manner, and foreign matter interposed in the documents is removed from the cover plate. Provide a detection means to detect it.

According to the present invention, even if there are binding metal fittings remaining in the document without being removed, the detection means detects the binding metal fittings,
Since the information is displayed to the operator using an indicator or the like, problems such as document damage do not occur.

Example The present invention will be explained below with reference to the illustrated embodiments.

FIG. 1 shows a copying machine equipped with a document feeding device according to the present invention, where 2 is a casing of a main body of the copying machine, and a platen glass 2 serving as a document supporting surface is provided on the upper surface of the casing. Equipment necessary for copying, such as an exposure system and a photoreceptor, are arranged inside the lower part of the platen glass 2, so that the image of the original placed on the platen glass 2 is copied onto paper. There is.

A document feeder 3 is also provided on the upper surface of the casing 1, and this document feeder includes a delivery portion 31 that accumulates and stores a large number of documents and sends out the documents one by one onto the platen glass 2; and a conveyance section 32 that conveys the document to a predetermined position on the platen glass 2.

A document storage container 4 is provided in the sending portion 3I, and documents 5 to be copied are stacked and stored in the storage container 4. The document storage container 4 has a middle bottom 7 which is biased upward by a spring 6, and the stacked documents 5 are pushed up by the middle bottom 7, and the topmost document is associated with a vinyl roll 8 and rolled up. be sent to the left. Then, the platen glass 2 is moved by the feed roll 9.
Above said conveying part 3. You can proceed to

The conveying part 3□ consists of left and right parts 11 (a pair of goosenecks and a conveyor bell passed between these pulleys) 12, and is fed onto the platen glass 2 as described above. The document is further advanced to a predetermined position by the conveyor belt 12. A positioning member 13 is provided on the output side of the transport section 32 adjacent to the platen glass 2 so as to be able to rise and fall freely up and down. When carrying in a document, the positioning member 13 is raised upwardly, so that the leading edge of the document is aligned with the positioning member. The conveyor belt 12 is configured to stop when it comes into contact with the conveyor belt 13. When carrying out the copied original to the original carrying out section I4, the positioning member 13 is collapsed downward.

A cover plate 15 is provided on the upper part of the document storage container 4 so as to be openable and closable via a hinge 16, and the vinyl roll 18 is also attached to @1.
7, the cover plate 15 is provided so as to be able to swing vertically.
After opening roll a upward and storing the document in document storage container 4, cover plate 15 and roll 8 are swung downward to cover the surface of document 5 with cover plate 15, and roll 8 is placed on the document surface. to relate to.

The cover plate 15 does not necessarily have to cover the entire surface of the original 5;
For example, as shown in FIG. 2, it may be formed into a frame-shaped member. The cover plate 15 shown in the figure has three frame parts 1.5. +
152-153, and each of these frame portions is configured to cover the peripheral edge of a document of a predetermined size, for example, B6-4 or E4 size, stored in the document storage container 4 (1). The roll 8 is associated with the surface of the document 50 through the space between these frame portions.

Each of the frame portions 15+, 15□, and 153 of the cover plate 15 is provided with detection means for detecting binding metal fittings such as a stapler interposed within the document 5. In this embodiment, a proximity switch [8] is used as the detection means. A proximity switch opens and closes contacts by detecting changes in the electric field or magnetic field when a metal or magnetic object approaches. , is widely used in various fields as a switch that detects the presence or absence of an object and its position without contacting the object.In this embodiment, such a proximity switch 18 is used as shown in FIGS. 2 and 3.
Each frame part 15. ．． 15. , 153, and each of these proximity switches [8 is connected in parallel to the detection circuit 19; however, in FIG.
and the contact piece [8, are schematically shown.

Since the cover plate 15 is constructed as described above, the pressure applied by the metal fittings used to bind the originals, such as a stapler, remains in the originals 5 stored in the original storage container 4, as shown in FIG. If the proximity switch is close to the claw 20 [
8 responds to this pressure application and its contact [81 closes.

Then, the detection circuit 19 is closed, and the display 21 provided in the circuit 19 displays "Foreign object present". This allows the operator to stop the operation and remove the claw 20 from the document 5, thereby preventing accidents such as damage to the document. The conductive wire may be extended into the main body of the copying machine and provided at an appropriate location in the main body, or the operation of the copying machine may be automatically stopped in response to the operation of the display 21.

The arrangement interval of the proximity switch L8 is determined according to the metal sensing range of the switch [8. In addition, since the manuscript is bound at its periphery, as described above, the frame portion 15. It is sufficient to provide proximity switches [8] only at +152-153.

In order to detect binding metal fittings interposed in a document, it is possible to use various detection means other than the above-mentioned proximity switch. If a high-frequency current is passed through this, the presence of a metal piece can be detected by changes in the inductance of some loops.

In addition, the frame portions 15+, 15z of the cover plate 15,
In 153, a fiber optic system in which a large number of optical fibers are bundled in a plate shape is arranged with its input end face facing the document surface, and the difference in intensity of reflected light from the document surface is photoelectrically detected. It is also possible to detect the presence of foreign matter in the periphery of the document. According to such a detection means, it is possible to detect even when the members binding the originals are not made of metal.

In the above embodiment, the cover plate 15 is provided on the document storage container 4 by a hinge 16 so as to be openable and closable; however, the cover plate 15 is made into a single unit separate from the document storage container 4 and simply placed on the document 5. It can also be used as a personal item. In this case, the detection circuit 19 and the display 21 are also preferably provided on the cover plate I5. Note that the present invention is not limited to these embodiments, and it goes without saying that many further modifications can be made within the scope of the present invention.

Effects of the Invention As described above, in the present invention, in a document feeding device that is provided adjacent to an image recording device such as a copying machine and feeds documents stored in a stacked manner onto the support surface one by one, A cover plate is provided to cover the surface of the document stored in the storage, and a detection means is provided on the cover plate to detect foreign matter intervening in the document. Even if the document is being fed, this can be automatically detected, thereby preventing damage to the document when attempting to feed the bound document one by one, and various other troubles caused by abnormal document feeding. You can do it.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view of a copying machine equipped with a document feeder according to the present invention, FIG. 2 is a plan view of a cover plate, and FIG. 3 is a sectional view thereof. 1...Casing, 2...Platen garanu (document support surface), 3...Document feeder, 4...Document storage container,
5... Document, 6... Spring, 7... Middle bottom, 8... Vinci roll, 9... Feed roll, 10-1.1... Pulley, 12... Conveyance bell 113...・Positioning member-
14...Pa document delivery section, 15...Cover plate, I6...
Hinge, 17...Arm, L8...Proximity switch, 19
...detection circuit, addition...claw-21...indicator.

Claims (1)

[Claims] In a document feeding device that is provided adjacent to a document support surface of an image recording device and feeds document sheets stored in a layered manner onto the support surface one by one, a cover plate that covers the surface of the document stored in a layered manner. What is claimed is: 1. A document feeding device, characterized in that the cover plate is provided with a detection means for detecting a foreign object interposed in the document.