JPH08314332A - Image forming device - Google Patents

Abstract

(57) [Summary] [Purpose] Efficiently copy mixed two-sided originals. The automatic document feeder 3 has a document detecting means for detecting whether the document to be conveyed to the reading section is a double-sided document or a single-sided document, and the documents A and C are double-sided documents at the start of conveyance. Further, by detecting that the original B is a single-sided original at the start of conveyance, the recording paper in which one side of the double-sided original is copied on one side is once fed to the intermediate tray 1 and then recorded again on the opposite side. To the department.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus for reading an original image and forming an image on a recording medium on the basis of an image signal, and more particularly to forming an image on both sides of the recording medium based on a double-sided original. The present invention relates to a possible image forming apparatus.

[0002]

2. Description of the Related Art FIG. 3 is an explanatory diagram of image forming and recording on both sides of a recording sheet based on a double-sided original in a copying machine which is a conventional image forming apparatus.

Reference numeral 1 is an intermediate tray for recording on both sides of a recording sheet corresponding to a double-sided original, 2 is an accommodating tray for accommodating recording sheets, 3 is automatic document feeding for placing originals and conveying them sequentially to a recording unit. Devices 4 are manuscripts.

When recording on both sides, as shown in FIG. 3, the sheet is temporarily stored in the intermediate tray 1 after copying on the first side of the document. Then, the process is performed such that the sheet is again conveyed from the intermediate tray, copied on the second side, and ejected.

[0005]

In the above-mentioned conventional example, when copying a plurality of originals having both sides and one side mixed, a blank image which does not actually exist on the back side of the one-sided original is also copied, and the time is wasted accordingly. Is.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide an image forming apparatus capable of efficiently performing recording even when a single-sided original and a double-sided original are mixed. Is.

[0007]

Therefore, in the image forming apparatus according to the present invention, the automatic document feeding means for sequentially feeding the document to the document reading portion and the reading for reading the image of the fed document and outputting the image signal. Unit, an image forming unit that forms an image on a recording medium based on the image signal, a recording medium conveying unit that conveys the recording medium to the image forming unit and discharges the image recording medium to the outside, and a control that controls each unit. And an automatic document feeder having original detecting means for detecting whether the original to be conveyed to the original reading portion is a single-sided original or a double-sided original. The means includes an intermediate tray for recording on both sides of a recording medium corresponding to a double-sided original, and the control means controls the recording medium conveying means based on a detection signal from the original detecting means to perform double-sided printing. With the configuration which comprises carrying out the recording, it is intended to achieve the above object.

Alternatively, in the above construction, the document detecting means is not provided, and the double-sided document information input means for inputting the number of the double-sided document in the document set in the automatic document feeding means is provided. The above-mentioned object is to be achieved by the constitution characterized by the above.

[0009]

With the above structure, when copying a plurality of originals,
Since the intermediate tray is used for double-sided printing and the paper feeding from the paper tray is switched for single-sided printing, it is possible to perform printing efficiently.

[0010]

【Example】

(First Embodiment) FIG. 1 is a schematic sectional view showing an example of the operation of this embodiment. 1A to 1D are "plural originals A, B, and C (where A and C are double-sided originals and B is a single-sided original).
To copy. Is an explanatory view of the assumption.

FIG. 1A shows an automatic document feeder (AD).
F) A figure in which originals A, B, and C are set on 3. Figure 1 (B)
Is a state in which the first side of the double-sided originals A and C is copied and primarily stored in the intermediate tray 1. The one-sided original B is passed through by the ADF.

FIG. 1C shows a state in which the second side of the double-sided original C is copied and then the single-sided original B is copied. At this time, the copy B is fed from the paper tray 2.

FIG. 1D shows a state in which the second side of the double-sided original A is copied and the operation is completed.

FIG. 2 is a schematic sectional view of an ADF showing a structure for detecting a double-sided original and a single-sided original.

As shown in FIG. 2, the embodiment has a light source 5 for detecting a double-sided original, a single-sided original, and a photosensor 6 on the side of the automatic original feeding device, and either a double-sided original or a single-sided original depending on the reflected light from the back side of the original. Is configured to be detected.

(Embodiment 2) Although Embodiment 2 does not have a structure for detecting a double-sided original or a single-sided original as described in the explanation of the first embodiment, it is manually operated such that "XX sheets are single-sided." By inputting, it is possible to make the same paper feed copy as in the first embodiment.

[0017]

As described above, according to the present invention,
Even if the original is a double-sided original or a plurality of originals including a mixture of single-sided originals, the control means appropriately controls the recording medium conveying means based on the information from the original detection means or the double-sided original information input means to perform double-sided recording. Thus, it is possible to provide an image forming apparatus which can shorten the recording time as compared with the conventional case and improve the recording efficiency.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an operation example of the first embodiment.

FIG. 2 is a schematic sectional view of the automatic document feeder of the first embodiment.

FIG. 3 is an explanatory diagram of image forming and recording on both sides of a recording sheet based on a double-sided original by a conventional copying machine.

[Explanation of symbols]

1 Intermediate tray 2 Storage tray 3 Automatic document feeder 4 Original document 5 Light source for detecting double-sided originals, single-sided originals 6 Photosensors for detecting double-sided originals, single-sided originals A, C Double-sided originals B Single-sided originals

Claims (2)

[Claims] 1. An automatic document feeding unit for sequentially feeding a document to a document reading unit, a reading unit for reading an image of the fed document and outputting an image signal, and an image forming for forming an image on a recording medium based on the image signal. An image forming apparatus comprising: a recording medium conveying unit configured to convey a recording medium to the image forming unit and eject the recording medium to the outside after recording an image; Has an original detecting means for detecting whether the original conveyed to the original reading portion is a single-sided original or a double-sided original, and the recording medium conveying means records on both sides of the recording medium corresponding to the double-sided original. Equipped with an intermediate tray of
The image forming apparatus, wherein the control unit controls the recording medium conveying unit based on a detection signal from the document detecting unit to perform double-sided recording. 2. An automatic document feeding means for sequentially feeding a document to a document reading portion, a reading means for reading an image of the fed document and outputting an image signal, and an image forming for forming an image on a recording medium based on the image signal. Means, a recording medium conveying means for conveying the recording medium to the image forming means and discharging it to the outside after the image recording, and the number of double-sided originals in the original set in the automatic original feeding means. An image forming apparatus comprising a double-sided document information input unit and a control unit for controlling each unit, wherein the recording medium conveying unit includes an intermediate tray for recording on both sides of a recording medium corresponding to a double-sided document. The image forming apparatus, wherein the control means controls the recording medium conveying means based on an input signal from the double-sided document information input means to perform double-sided recording.