KR200203262Y1 - Paper sensing device for duplex image forming apparatus - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs.

The present invention relates to a paper detecting device of a double-sided image forming apparatus, and more particularly, to a paper detecting device of a double-sided image forming apparatus capable of detecting the presence or absence of paper in a paper feed cassette and whether or not the paper is progressed for forming a double-sided image with a single sensor. .

I. The technical problem that the invention is trying to solve.

An object of the present invention is to provide a paper detecting apparatus of a double-sided image forming apparatus capable of detecting the presence or absence of paper in the paper feed cassette and whether or not the paper is progressed for forming a double-sided image using one actuator.

All. The gist of the solution of the invention.

The present invention provides a double-sided image forming apparatus having a paper feed cassette and a paper conveying guide, comprising: an actuator rotatable about an axis of rotation formed on an upper side of the paper conveying guide, the actuator being provided so that an end thereof contacts an upper surface of a paper plate; An auxiliary arm extending upward from one side of the actuator; And a first detector and a second detector respectively installed within a radius of rotation of the auxiliary arm.

la. Important uses of the devise.

The present invention is used to detect a sheet of a double-sided image forming apparatus.

Description

Paper Sensing Device for Duplex Imaging Machine

The present invention relates to a paper detecting device of a double-sided image forming apparatus, and more particularly, to a paper detecting device of a double-sided image forming apparatus capable of detecting the presence or absence of paper in a paper feed cassette and whether or not the paper is progressed for forming a double-sided image with a single sensor. .

1 is an internal configuration diagram of a double-sided image forming apparatus according to a general embodiment, in which paper 15 loaded in the paper feed cassette 10 is picked up into the main body by rotation of the pickup roller 20, and the picked up paper 15 moves to the developing device 30 along the conveyance guide 22.

Subsequently, the photosensitive drum 32 of the developer in which the toner was developed on the outer circumferential surface after the electrostatic latent image was formed by the exposure unit 36 transfers the toner image on the paper 15 by interaction with the transfer roller 34, and the toner transferred to the paper 15. The image is fixed to the paper surface by heat and pressure as the paper passes between the heating roller 41 and the fixing roller 40.

Then, the paper 15 passing through the heating roller 41 and the fixing roller 40 passes between the discharge rollers 50, and one end of the paper rotates the reverse guide 42 by the rotational force of the discharge rollers 50. That is, the paper 15 is discharged to the outside through the outlet roller 60 in the case of the single-sided printing while rotating the reverse guide 42.

On the other hand, in the case of double-sided printing, the backside printing must be repeated once more in addition to the above single-sided printing. In this case, when the paper 15 passes the reversal guide 42, a paper detection sensor (not shown) detects the paper and controls the paper detection signal. Will output

Then, the control unit outputs a reverse rotation instruction signal to the drive unit for driving the outlet roller 60, and the drive unit in response to the signal reversely rotates the outlet roller 60. Accordingly, the paper 15 is vertically lowered along the back conveyance guide 62 formed on the lower side of the outlet roller 60 without being discharged to the outside and is turned upside down again, and is then horizontally transported, so that a plurality of back feed rollers 70, 80, and 90 are installed. It passes between the paper feed guides 92. Subsequently, the paper 15 transferred to the pickup roller 20 is discharged to the outside through the outlet roller 60 through an image forming process as in the case of single-sided printing.

On the other hand, the conventional double-sided image forming apparatus has a sensor for detecting the presence or absence of paper in the paper feed cassette, and a sensor for detecting whether or not the paper that has finished forming the single-sided image proceeds to form the image on the remaining back side, respectively.

However, when a separate sensor is provided to detect the absence of paper and whether the paper is transported for double-sided image formation as described above, the internal structure of the double-sided image forming apparatus becomes complicated, and accordingly the work of There was a problem of low efficiency.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a paper detecting apparatus of a double-sided image forming apparatus capable of detecting the presence or absence of paper in a paper cassette and whether or not the paper is progressed for double-sided image formation using a single actuator. .

In order to achieve the above object, the present invention is a double-sided image forming apparatus having a paper feed guide provided with a paper plate and a paper feed guide formed on an upper side of the paper feed cassette, wherein the rotation axis formed on the paper feed guide is centered. An actuator which is rotatable and whose end portion is in contact with the upper surface of the paper plate; An auxiliary arm extending upward from one side of the actuator; And a first detector and a second detector respectively installed within a radius of rotation of the auxiliary arm.

1 is a block diagram showing the inside of a double-sided image forming apparatus according to a general embodiment;

2 is a schematic view showing a paper-free state of a paper cassette of a double-sided image forming apparatus provided with a paper detecting device according to a preferred embodiment of the present invention;

3 is a schematic view showing a state in which paper is fed from a paper feed cassette of a double-sided image forming apparatus of the present invention;

Figure 4 is a schematic view showing a state that the paper is finished for single-sided printing through the transfer guide of the double-sided image forming apparatus of the present invention for the back side printing.

<Explanation of symbols for the main parts of the drawings>

12: paper plate 92: paper feed guide

100: actuator 102: rotation axis

104: secondary arm 106: first detector

108: second detector

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

2 is a schematic diagram showing a paper-free state in a paper feed cassette of a double-sided image forming apparatus provided with a paper detecting device according to a preferred embodiment of the present invention.

As shown in Fig. 2, the double-sided image forming apparatus according to the features of the present invention forms a plate hole 14 in the paper plate length direction at the end of the paper plate 12 of the paper feed cassette, and forms a single-sided image on the upper side of the paper plate 12. If the finished paper is the remaining back, the paper conveyance guide 92, which is a passage conveyed for image formation, is formed.

In addition, the double-sided image forming apparatus formed as described above is provided with a paper detection device according to a preferred embodiment of the present invention, the paper detection device is rotatable about the rotating shaft 102 formed on the upper side of the paper transfer guide 92, the end is An actuator 100 installed in contact with the upper surface of the paper plate 12 and having a hollow 101 formed therein for reducing the weight, an auxiliary arm 104 extending upwardly from one side of the actuator 100, and a second installed within the rotation radius of the auxiliary arm 104, respectively. 1 detector 106 and a second detector 108.

In particular, the first sensor 106 and the second sensor 108 may use a photo sensor or a photo interrupter. First, when using a photo sensor having a light emitting part and a light receiving part formed on the same surface, the auxiliary arm 104 may be used. A surface treatment such as white is performed to reflect light on the inner surface of the end portion of the end.

Accordingly, the first detector 106 and the second detector 108 form a double-sided image according to whether the light emitted from the light emitter is reflected on the inner surface of the end of the auxiliary arm 104 and is detected by the light receiver or not by the light receiver. The paper detection signal is output to the control unit formed in the machine.

On the other hand, when using a photo interrupter having a light emitting unit and a light receiving unit facing each other as the first detector 106 and the second detector 108, light may be absorbed at one end surface of the auxiliary arm 104. Surface treatment to make sure.

Accordingly, the first detector 106 and the second detector 108 are double-sided image forming apparatuses, depending on whether light emitted from the light emitting unit is absorbed by one side of the end of the auxiliary arm 104 and not detected by the light receiving unit or is detected by the light receiving unit. The paper detection signal is output to the control unit formed in the inside.

As shown in FIG. 2, when the paper loaded in the paper cassette is exhausted and there is no paper on the upper surface of the paper plate 12, the actuator 100 is rotated about its rotation axis 102 by its own weight so that the lower end of the actuator 100 has a paper plate 12. Falls into plate hole 14 formed in.

In this case, an end of the auxiliary arm 104 extending upward from the actuator 100 is positioned at the front of the first detector 106. The first detector 106 outputs a sensing signal to the controller, and the controller is configured to input the sensing signal. Detect that there is no paper in the paper plate 12 of the paper cassette.

Fig. 3 is a schematic diagram showing how paper is fed from the paper feed cassette of the double-sided image forming apparatus of the present invention.

Meanwhile, as shown in FIG. 3, in the state where paper remains in the paper feed cassette, the paper 15 loaded on the upper surface of the paper plate 12 of the paper feed cassette obstructs the plate hole 14, so that the end of the auxiliary arm 104 formed in the actuator 100. Is positioned between the first detector 106 and the second detector 108.

Accordingly, the first detector 106 outputs a detection signal to the control unit, and the control unit detects that paper is loaded on the paper plate 12 of the paper cassette from the input detection signal.

Figure 4 is a schematic diagram showing a state that the paper is finished for single-sided printing through the paper transfer guide of the double-sided image forming apparatus of the present invention is transferred for the back side printing.

On the other hand, when the paper 15 is transferred through the paper transfer guide 92 formed on the upper side of the paper cassette as shown in FIG. 4, the paper 15 passing through the paper transfer guide 92 pushes up the lower end of the actuator 100 upwards. .

In this case, as the actuator 100 rotates upwardly about the rotation axis 102, an end portion of the auxiliary arm 104 extending upward from the actuator is positioned in front of the second detector 108, and the second detector 108 sends a detection signal to the controller. The controller detects that the sheet 15 for forming the double-sided image is being transferred through the sheet feed guide 92 from the input detection signal.

As described above, the paper detecting apparatus of the double-sided image forming apparatus according to the embodiment of the present invention detects the presence or absence of paper in the paper cassette and whether the paper is progressed for forming the double-sided image at one place by using one actuator, thereby forming the double-sided image. It simplifies the internal structure of the machine and increases the efficiency of work during inspection and troubleshooting.

Claims (3)

A double-sided image forming apparatus having a paper feed cassette provided with a paper plate and a paper feed guide formed above the paper feed cassette, An actuator rotatable about an axis of rotation formed above the paper conveying guide, the actuator being provided in contact with an upper surface of the paper plate; An auxiliary arm extending upward from one side of the actuator; And a first detector and a second detector respectively installed within the radius of rotation of the auxiliary arm. The apparatus of claim 1, wherein each of the first and second detectors comprises a photo sensor. The apparatus of claim 1, wherein a hollow is formed in the actuator to reduce the weight of the actuator.