JPS62249848A - Automatic transfer device for original - Google Patents

Abstract

PURPOSE:To transfer an original with the original face and the focal plane coinciding and obtain a stable image by providing a device spouting or sucking air on an original transfer passage between an automatic transfer device for original and an image forming device main body. CONSTITUTION:When an original 5 is mounted on a paper feed tray 4, a sensor 16 detects it, and a transfer roller 6 and a fan 12 are driven. The air spouted through small holes 13 by the rotation of the fan 12 presses the original 5 to a platen glass 3. If an air sucking system is employed, the original 5 is pressed to a reflector 10. The original having been scanned at an exposure position is discharged to a paper discharge tray 8 by a discharge roller 7. The fan 12 continues to be rotated for a fixed time before the original is fed and while originals 5 are continuously transferred and for a fixed time after the final original is discharged to cool the platen glass 3 and remove paper powder or the like generated during the transfer of originals.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Industrial Application The present invention relates to an automatic document feeder that feeds and discharges documents to and from an image forming apparatus, and specifically relates to an automatic document feeder that feeds and discharges documents to and from an image forming apparatus. The present invention relates to an automatic document feeder for causing a forming device to read a document as it flows.

(b) Conventional technology - a. This type of automatic document feeder automatically feeds the document to the image forming apparatus and discharges the document after the image forming process by scanning. They are arranged with a certain gap between them, which serves as a document transport path.

On the other hand, in the automatic document feeder described above, various documents of different sizes and paper qualities are fed, and the thickness of the conveyance path is made considerably larger than that of a normal document in order to prevent paper jams on the way.

9 Problems to be Solved by the Invention By the way, in the above-mentioned automatic document feeder, since the document conveyance path is considerably larger than the thickness of the document as described above, the document may flap while being conveyed to the image forming apparatus and exposed. In some cases, the document surface and the focus for image formation did not match, resulting in unstable images.

Furthermore, in the fixed reading position type image forming apparatus as described above, since the same area is always exposed, there is a risk that the temperature of that area will rise and the characteristics and shape of parts in the vicinity may change.

(b) Means for solving the problem The present invention aims to solve the above-mentioned problems,
Air is blown or sucked into the document transport path between the automatic document feeder and the main body of the image forming apparatus from the feeder side toward the main body side, or conversely from the main body side toward the feeder device. It is characterized by being configured as follows.

(E) Effect By employing the above means, when automatically feeding a document to the image forming apparatus, the document fed to the document transport path between the automatic document feeder and the main body of the image forming apparatus is By air blowing or suction means provided on the feeding device side or the main body side, the material is pressed against the platen glass surface provided on the main body or the reflecting plate provided on the feeding device, and is transported without flapping at the exposure position. Ru.

Further, this air blowing/suction means also functions as a cooling means for an area where the temperature rises due to constant exposure by a fixed exposure section of the image forming apparatus.

&→ Embodiments Hereinafter, embodiments embodying the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment in which air blowing means is provided on the automatic document feeder side. A platen glass 3 is provided on the upper surface of the image forming apparatus main body l, and the main body exposure position for reading a document is fixed at point P (arrow). Above the image forming apparatus main body 1, there are a feeding roller 6 that feeds out the original 5 from the paper feeding tray 4, and a roller 7 that ejects the original onto the paper ejection tray 8.
, and an air blowing box 9 located therebetween and having a reflecting plate 10 on the lower surface. The gap between the document conveyance path 11 located between the platen glass 3 and the reflection plate 10 is adjusted so that there is a slight margin for the maximum thickness of the document to be conveyed. A fan 12 rotated by a drive source (not shown) is provided in the air blowing box 9 constituting the air blowing means, and air is blown out to the document conveyance path 11 through a small hole 13 provided in the reflection plate 10. Ru. As shown in a plan view in FIG. 2, the reflective plate 10 is provided with a large number of small holes 13 on the document loading and unloading sides except for an area 14 corresponding to the main body exposure position P. This small hole 13 is slanted with respect to the vertical line, so that the blown air is applied to the exposure position P of the main body for reading the document. If adopted, a suction device such as a compressor is used in place of the fan 12. Note that 15 is a document guide, and 16 and 17 are sensors that detect the presence or absence of a document.

Since this embodiment has the above configuration, the original w45
When feeding the document 5 to a fixed exposure position P of the image forming apparatus 1, when the document 5 is placed on the paper feed tray 4, the sensor 16 detects this and sends a signal to drive the feed roller 6 and fan 12. . Air blown out from the small holes 13 by the rotation of the fan 12 presses the original 5 sent from the feeding roller 6 against the platen glass 3. When air suction is used instead of air blowing, the document is pressed against the reflecting plate 10 in the opposite direction. The original scanned at the exposure point Mp is
It is sent to the unloading side while being guided by a guide 15, and is
The document is sent to a paper discharge tray 8 by a discharge roller 7 which is rotated when the document is detected.

The fan 12 is configured to continue rotating for a certain period of time after the document is fed, and continues to rotate for a certain period of time while the document is being continuously conveyed and after the final document is ejected to cool the platen glass. At the same time, paper dust and the like generated due to continuous conveyance of originals are removed.

Next, FIG. 3 shows another embodiment in which air blowing means is provided on the image forming apparatus main body 1 side. A platen glass 18 having a large number of small holes 19 is provided on the top surface of the main body 1 of the image forming apparatus, and the main body exposure position for reading the original is at point P (
arrow). Above the main body 1 of the image forming apparatus, there is a document automatic mechanism that includes a feed roller 23 that feeds out the original Tl 422 from the paper feed tray 21, a discharge roller 24 that discharges the document onto the paper discharge tray 25, and a reflector 26 located between them. A feeding device 2 is provided. platen glass 18
The original mflli? located between the gap between the reflector 26 and the reflector 26? Conveyance route 27
is set so that there is a slight margin for the maximum document thickness to be transported.
The gap has been adjusted. Air supply #128 that constitutes air blowing means built into the image forming apparatus main body 1
Inside, there is a fan 29 rotated by a drive source (not shown).
is provided.

This air supply path has a shape that does not block exposure for image reading, and blows air from a small hole 19 in the platen glass 18 to the document conveyance path. On the platen glass 18,
As shown in a plan view in FIG. 4, a large number of small holes 19 are provided on the document loading and unloading sides except for an area 30 corresponding to the main body exposure position P. This small hole 19 is inclined obliquely with respect to the vertical line, so that the blown air is directed toward the main body exposure position P. When suction is used instead of air blowing, a suction device such as a compressor is used instead of the fan 29. In addition, 31 is a guide for the manuscript, 32
, 33 are sensors that detect the presence or absence of a document.

Since this embodiment has the above-described configuration, when sending the original 22 to the fixed exposure position P of the image forming apparatus 1,
When the document 22 is placed on the paper feed tray 21, the sensor 32 detects this and sends a signal to drive the feed roller 23 and fan 29. Air blown out from the small holes 19 by the rotation of the fan 29 presses the original 22 sent from the feeding roller 23 against the reflecting plate 26. When air suction is used instead of air blowing, the document is pressed against the platen glass 18 in the opposite direction. The original scanned at the exposure position MP is guided by a guide 31 and sent to the delivery side.
A discharge roller 24 rotates when the sensor 23 detects the document.
The paper is delivered to the paper discharge tray 25 by the following. The fan 29 is configured to continue rotating for a certain period of time after the original is fed, and continues to rotate for a certain period of time while the original is being continuously conveyed and after the last original is ejected, thereby cooling the platen glass and cooling the platen glass. It also removes paper dust, etc. generated by continuous conveyance of originals.

In both of the above embodiments, the fan rotates for a certain period of time after the document is fed, but the temperature of the exposure position on the platen glass is detected and the fan is rotated to blow out air even when the temperature exceeds a certain temperature.・It is also possible to perform efficient cooling by suction.

(G) As described in detail, according to the present invention, the means for blowing or sucking air into the document conveying path between the automatic document feeder and the main body of the image forming apparatus is provided on the side of the automatic document feeder or in the image forming apparatus. Since it is provided on the main body side of the forming apparatus, the original ↑ height being conveyed is pressed to a fixed position without flapping, and the document surface and the focal plane are aligned, making it possible to obtain a stable image. Further, since air flows through the document transport path, it is possible to prevent temperature rise at the exposure position, such as the platen glass, even in an image forming apparatus of a fixed exposure position type. Furthermore, it is also possible to remove paper dust caused by continuous conveyance of documents.

[Brief explanation of drawings]

FIG. 1 is a side view showing an embodiment of an automatic document feeder according to the present invention, FIG. 2 is a plan view showing the reflector shown in FIG. 1, and FIG.
The figure is a side view showing another embodiment, and FIG. 4 is a plan view showing the platen glass of FIG. 3. 1...Image forming apparatus main body, 2...Automatic document feeder, 3...Platen glass, 9°°° air blowing box, 10...Reflector, 11...
Document conveyance path, 18... platen glass, 26...
・・Reflector plate, 27・・Hara Ti4 Kotobuki route, 28・
...Air supply path.

Claims (4)

[Claims] (1) In an automatic document feeder that is installed on the main body of an image forming apparatus and feeds and ejects documents for image formation, means is provided for blowing or suctioning air into the document conveyance path that conveys the documents. An automatic document feeder. (2) The automatic document feeder according to claim 1, wherein the image forming device is a fixed reading position type image forming device, and is configured so that the document is read while being fed by the automatic document feeder. . (3) The automatic document feeder according to claim 1 or 2, wherein the means for blowing out or sucking the air is built into the automatic document feeder. (4) The automatic document feeder according to claim 1 or 2, wherein the means for blowing out or sucking the air is built into the main body of the image forming apparatus.