JPH0227666B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention automatically separates a plurality of sheet-like originals stacked at a predetermined location one by one one by one, and places the multiple sheet-like originals on a predetermined location on the document mounting table of the main body of a copying machine. An automatic document feeder that feeds the document using a belt or roller, and transfers (discharges) the document from the document table to the document storage unit after exposure, or
The present invention relates to a copying machine equipped with a document feeding device that replaces the function of separating a plurality of sheet documents one by one in such devices by manually inserting the documents one by one by the operator.

FIG. 1 shows a partial cross-sectional view of a conventional copying machine equipped with a document feeder as described above. Further, FIG. 2 is a perspective view of the main part of the conventional example, and FIG. 3 is a sectional view of the main part of the conventional example. To explain this, 1 is the main body of the copying machine, 2 is a sheet-like original to be copied, and the original is inserted with the side to be copied facing upward by an automatic document separating device (not shown) or by a handler. It is inserted into the mouth 3 as shown by arrow A. 4 and 5 are document feeding guide members, 6, 7,
Reference numerals 8, 9, and 10 feed the original 2 inserted from the original insertion opening 3 onto the original platen 11 made of a glass plate through the path indicated by the dotted line in FIG. These are a feed roller and a rubber belt for transporting (discharging) the original on the mounting table 11 onto the tray 12 that constitutes the original storage section. As illustrated in FIG. 2, the rubber belt 10 is a plurality of elongated endless belts, and the rubber belt 10 and the feed rollers 6, 7,
8 and 9 constitute a document feeding device. Further, 13 in FIG. 1 is an opening/closing lid for allowing the copied originals accumulated on the tray 12 to be taken out of the copying machine, and 14 is a rubber belt 10 located above the original table 11. It is a document cover placed further above the document cover, and is usually made of a white rubber sheet or a sheet member painted white. 1
Reference numeral 5 denotes a stopper for positioning the document inserted through the document insertion slot 3 at a predetermined location on the document mounting table 11.

In the conventional example configured as described above, if the original 2 is a transparent material such as training paper, there is a problem that the boundary line of the rubber belt 10 is also unnecessarily copied. Ta. This will be further explained with reference to FIG.

Light from an image exposure light source 16 movably disposed below the document platform 11 passes through the document platform 11 , and a portion of the light is reflected by the surface of the document 2 on the document platform 11 and is reflected by the mirror 17 . and then to a photosensitive drum (not shown). A portion of the remaining light passes through the plain area, ie, the transparent area, of the original 2, is reflected by the surface of the rubber belt 10 on the back (upper side), passes through the optical path 18, and reaches the photosensitive drum. leading to. In addition, in areas where the rubber belt 10 is not present, the light is reflected from the surface of the document cover 14 located on the back (above) and passes through the optical path indicated by 19.
It reaches the photosensitive drum. In this case, since the illuminance is different between the surface of the rubber belt 10 and the surface of the document cover 14, the reflected light in the optical paths 18 and 19 naturally appears as a difference in illuminance on the photosensitive drum surface.

Furthermore, when viewed from the image exposure light source 16, the light reflected by the shadowed portion 20 of the rubber belt 10 has an even lower illuminance than the reflected light in the optical path 19. Therefore, when copying is performed using a translucent original, the resulting copy will have shading in the vicinity of the boundary line of the rubber belt 10.

The above-mentioned problems are not limited to rubber belt-type document feeders, but can also be found in copying machines equipped with roller-type document feeders.

In order to solve the above problem, a device using a rubber belt wide enough to cover the entire document has been proposed, but with such a structure, the meandering of the belt becomes even more obvious. In order to prevent the meandering, it becomes necessary to take various measures, which leads to the structure of the device becoming more complicated and larger, and the cost to increase. Furthermore, since it is technically difficult, there is a problem of lack of reliability.

The present invention provides a copying machine that solves the above-mentioned problems. Hereinafter, the present invention will be explained based on the illustrated embodiments, and parts having the same functions as those explained in FIGS. 1 to 3 will be denoted by the same reference numerals, and redundant explanation will be omitted.

In FIG. 4, this embodiment is different from the conventional example shown in FIG. A light correcting means for light reflected from the document surface by the image exposure light source (see 16 in FIG. 3) is provided above (at the back) of the long and thin endless rubber belt 10 (see 16 in FIG. 3).

Here, in the embodiment shown in FIG. 4, the light correction means refers to the lamps 21a and 2 that are energized and emit light when exposing the original placed on the original placing table 11.
1b, or one configured with the lamps 21a, 21b and light reflectors 22a, 22b, 22c.

With the above configuration, even if a translucent material such as training paper is used as the original 2, the irradiation light or strong reflected light from the light correction means during exposure will cause the problem as explained in FIG. Since the illuminance unevenness of the reflected light in the optical paths 18 and 19 can be minimized, it is possible to obtain a clear copy in which the boundaries of the document feeder, that is, the rubber belt or the rollers are hardly visible. Moreover, this structure can be implemented with a very simple structure without significantly changing the shape of the conventional document feeder, and its effects are very large.

[Brief explanation of drawings]

Figure 1 is a partially cross-sectional main part configuration diagram of a conventional copying machine.
FIG. 2 is a perspective view of the main part, FIG. 3 is a sectional view of the main part, and FIG. 4 is a partially sectional view of the main part of an embodiment of the present invention. 1...Copy machine body, 2...Document, 6, 7, 8,
9...Feed roller, 10...Rubber belt, 11...
...Original table, 12...Tray, 16...Light source for image exposure, 21a, 21b...Lamp, 22a, 2
2b, 22c... Light reflector, 23... Specular reflection plate or fluorescent plate.

Claims (1)

[Scope of Claims] 1. A sheet-like original placed above a document-placing table, and feeding a sheet-like original to be copied to a predetermined location on the document-placing table, and transferring the copied sheet-like original to the document-placing table. The document feeder includes at least one of a plurality of belts and rollers as a document feeder that can transport documents from below to a document storage unit, and a document feeder is provided with a document feeder including at least one of a plurality of belts and rollers as a document feeder. A copying machine configured to irradiate light for image exposure to a document placed on the document table through the document table, the upper part of the document feeder being located above the document table. A copying machine further comprising a light correction means having a light source that performs light correction on the light reflected from the surface of the original by the image exposure light source. 2. Claim 1, characterized in that the light correction means consists of a combination of a light source and a specular reflection plate.
Copying machine mentioned in section.