KR100476967B1 - Image forming machine having automatic jam removing function and method for removing jam automatically - Google Patents

Abstract

The present invention relates to an image forming apparatus and an automatic jam removing method having an automatic jam removing function capable of automatically removing jammed paper by detecting the paper being meandered so as to be conveyed normally. In order to achieve the above object, an image forming apparatus having an automatic jam removing function according to the present invention includes a paper feeding unit for storing paper and supplying sheets one by one, an image forming unit for forming an image to be printed, and an image. A transfer unit for transferring the image formed by the forming unit to the paper conveyed from the paper feeding unit, a fixing unit for fixing the image transferred on the paper to the paper, and a discharge medium for discharging the paper on which the image is fixed from the fixing unit to the outside It is installed between the unit, each unit and the paper transfer guide unit for guiding the movement of the paper, and the front and rear sides of the paper transfer guide unit between the paper feeding unit and the transfer unit, and detects the width of the paper supplied from the paper feeding unit. It includes a paper feeder, and checks whether the paper fed from the paper feeder meanders with the paper feeder, and if paper feeds, paper feeder It is characterized in that the paper is supplied normally by repeating the operation in the reverse direction and the forward direction.

Description

Image forming machine having automatic jam removing function and method for removing jam automatically}

The present invention relates to an image forming machine, and more particularly, to an image forming machine and an automatic jam removing method having an automatic jam removing function capable of automatically removing jams and continuing feeding of paper when jams are generated.

In general, an image forming machine such as a copying machine or a laser printer separates a plurality of sheets of paper stacked in the paper feeding unit one by one, transfers them to the transfer unit and the fixing unit, forms a predetermined image on the paper, and discharges them to the outside by the discharge unit. . Therefore, it is necessary to monitor whether paper is conveyed to each unit normally without jamming.

Figure 1 shows the arrangement of the paper detection sensor in the image forming apparatus according to the prior art provided with a paper detection sensor for checking whether the jam occurred.

Referring to FIG. 1, the image forming apparatus includes a paper feeding unit 10, a transfer unit 20, a fixing unit 30, a discharge unit 40, and a paper sensor 60.

The paper feeding unit 10 transfers a paper feed cassette 11 for loading and supporting a plurality of sheets, a pickup roller 13 for separating and feeding sheets of paper stacked in the paper cassette 11, and the picked paper. It includes a paper feed roller 15 for feeding to the unit 20.

The transfer unit 20 includes a photosensitive drum 22 on which a predetermined image is formed by an image forming unit (not shown), and a transfer roller 24 provided to face the lower side of the photosensitive drum 22. Thus, the image formed on the photosensitive drum 22 by the image forming unit is transferred to the paper passing between the photosensitive drum 22 and the transfer roller 24 by the transfer roller 24.

The fixing unit 30 is composed of a heating roller 32 for generating a predetermined heat and a pressure roller 34 for applying a predetermined pressure. Therefore, the image transferred onto the paper passing through the fixing unit 30 is fixed to the paper by the heat of the heating roller 32 and the pressure of the pressure roller 34.

The discharge unit 40 is constituted by a pair of rollers so that the paper on which the image is fixed can be discharged to the outside.

In addition, between each of the paper feed unit 10, the transfer unit 20, the fixing unit 30, and the discharge unit 40, a paper feed guide 50 for guiding paper transfer to each unit is provided. .

The paper sensor 60 is provided with a paper feed sensor 61 and a discharge sensor 63, the paper feed sensor 61 is installed between the paper feed roller 15 and the transfer roller 24, the paper discharge sensor 63 Is installed between the fixing unit 30 and the discharge unit 40.

Referring to the action of detecting the paper jam in the image forming machine having the arrangement as described above are as follows.

The pickup roller 13 picks up the paper loaded in the paper feed cassette 11 and transfers it to the paper feed roller 15, and the paper feed roller 15 supplies this paper to the transfer unit 20. The sheet past the paper feed roller 15 moves to the transfer unit 20 while operating the paper feed sensor 61. At this time, the paper feed sensor 61 detects whether the paper picked up by the pickup roller 13 reaches within a predetermined time. If the picked-up paper does not operate the feed sensor 61 within a predetermined time, the pick-up roller 13 cannot pick up the paper or the picked-up paper is between the pick-up roller 13 and the paper feed roller 15. The jam is displayed on the panel of the image forming machine by recognizing the jam.

The paper which operated the paper feed sensor 61 within a predetermined time enters between the transfer roller 24 and the photosensitive drum 22, and the image formed on the photosensitive drum 22 is transferred onto the entered paper.

The sheet having the transferred image is conveyed to the fixing unit 30 along the sheet guide portion 55. The image on the paper entered between the heating roller 32 and the pressure roller 34 of the fixing unit 30 is fixed to the paper by the heat and pressure of the fixing unit 30.

The paper passing through the fixing unit 30 moves to the paper discharge unit 40 along the paper guide 57 while operating the paper discharge sensor 63. At this time, the discharge sensor 63 detects whether the conveyed paper reaches within a predetermined time. If the paper supplied from the fixing unit 30 fails to operate the discharge sensor 63 within a predetermined time, the paper is jammed in the transfer unit 20 or the fixing unit 30, or the paper transfer guide portion therebetween. It is judged that the jam (55) is to indicate the jam occurrence.

The paper in which the discharge sensor 63 is operated within a predetermined time passes through the discharge unit 40 and is discharged out of the image forming machine. By the way, even if the discharge sensor 63 does not return to its original state, that is, ON or OFF within a predetermined time after the discharge sensor 63 is operated, the paper is formed between the fixing unit 30 and the discharge unit 40. It judges that it is jammed and displays the jam occurrence again.

Therefore, when the paper is jammed in any part of the image forming machine, the jam is recognized and displayed to the outside so that the user can know the user, so that the user can open the jammed part and directly remove the jammed paper.

However, the image forming apparatus as described above has a problem in that work efficiency decreases because the image forming apparatus stops every time the paper is jammed, and the user has to open the jammed portion and remove the jam.

If the paper is jammed, the cover can be opened and the motor rotated to release the paper jammed between the rollers.However, if the paper is wrinkled or curled, the paper will be more wrinkled if the motor is rotated. There is a problem that the roller may be completely rolled up and cause the imager to break down.

The present invention has been made to solve the above problems, and provides an image forming machine having an automatic jam removing function that can automatically detect the jam of the paper as well as to automatically eject the jammed paper even when the paper is jammed. The purpose is.

Further, another object of the present invention is to provide an automatic jam removing method for automatically removing paper jam in an image forming machine having an automatic jam removing function.

In order to achieve the above object, an image forming apparatus having an automatic jam removing function according to the present invention includes a paper feeding unit for storing paper and supplying sheets one by one, an image forming unit for forming an image to be printed, and an image. A transfer unit for transferring the image formed by the forming unit to the paper conveyed from the paper feeding unit, a fixing unit for fixing the image transferred on the paper to the paper, and a discharge medium for discharging the paper on which the image is fixed from the fixing unit to the outside It is installed between the unit, each unit and the paper transfer guide unit for guiding the movement of the paper, and the front and rear sides of the paper transfer guide unit between the paper feeding unit and the transfer unit, and detects the width of the paper supplied from the paper feeding unit. It includes a paper feeder, and checks whether the paper fed from the paper feeder meanders with the paper feeder, and if paper feeds, paper feeder It is characterized in that the paper is supplied normally by repeating the operation in the reverse direction and the forward direction.

In addition, it is installed on the front left and right sides of the paper transfer guide portion between the fixing unit and the discharge unit, and further comprises a post-fixed sensor for detecting the width of the paper supplied from the fixing unit, meandering the paper supplied from the fixing unit by the post-fixed sensor (斜 行) It is characterized in that the paper is fed normally by repeatedly operating the fixing unit in the reverse direction and the forward direction when the paper is meandering.

In addition, the transfer unit between the transfer unit and the fixing unit is installed on the front left and right sides of the front end, and further includes a post-transfer sensor for detecting the width of the paper supplied from the transfer unit, meandering of the paper supplied from the transfer unit by the post-transfer sensor (斜 行) It is characterized in that the paper is fed normally by repeatedly operating the transfer unit in the reverse direction and forward direction when the paper is meandering.

Here, the pre-transfer sensor, which is installed between the paper feeding unit and the transfer unit, between the transfer unit and the fixing unit, and between the rear and right sides of each of the paper transfer guides between the fixing unit and the discharge unit, detects the width of the paper passing through, and before fixing. It is preferable to further include a sensor and a discharge sensor.

In particular, when the paper meanders even after the predetermined number of times of repeated operation, it is desirable to display the jam occurrence.

Another embodiment of the image forming apparatus having an automatic jam removing function according to the present invention is installed on the rear left and right sides of the paper transfer guide portion between the paper feed unit and the transfer unit, the pre-transfer sensor for detecting the width of the paper supplied from the paper feed unit. And a discharge sensor installed at the rear left and right sides of the paper transfer guide unit between the fixing unit and the discharge unit and detecting the width of the paper supplied from the fixing unit, and installed at the front left and right sides of the paper transfer guide unit between the transfer unit and the fixing unit. It includes a pre-fusing sensor that detects the width of the paper supplied from the unit, and checks whether the paper fed to each unit is meandered by the pre-transfer sensor, the discharge sensor, and the pre-fusing sensor. It characterized in that the paper is supplied normally by repeatedly operating the unit in the reverse direction and the forward direction.

In addition, the automatic jam removing method according to the present invention includes the step of determining whether the paper meandering, if the paper meandering, the step of trailing the paper by a certain distance, and the step of conveying the backed paper forward again, the paper It is characterized by repeating the above steps until no meandering. At this time, it is preferable to display a jam occurrence when the step of trailing the paper is more than a predetermined number of times.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the image forming apparatus having an automatic jam removing function according to the present invention. The same parts as in the prior art will be described with the same reference numerals.

2, the image forming apparatus having an automatic jam removing function according to the present invention, the paper feeding unit 10, the transfer unit 20, the fixing unit 30, the discharge unit 40, and the paper sensor 70 It includes.

The paper feeding unit 10 transfers a paper feed cassette 11 for loading and supporting a plurality of sheets, a pickup roller 13 for separating and feeding sheets of paper stacked in the paper cassette 11, and the picked paper. It includes a paper feed roller 15 for feeding to the unit 20.

The transfer unit 20 includes a photosensitive drum 22 on which a predetermined image is formed by an image forming unit (not shown), and a transfer roller 24 provided to face the lower side of the photosensitive drum 22. Thus, the image formed on the photosensitive drum 24 by the image forming unit is transferred to the paper passing between the photosensitive drum 22 and the transfer roller 24 by the transfer roller 24.

The fixing unit 30 is composed of a heating roller 32 for generating a predetermined heat and a pressure roller 34 for applying a predetermined pressure. Therefore, the image on the paper passing through the fixing unit 30 is fixed to the paper by the heat of the heating roller 32 and the pressure of the pressure roller 34.

The discharge unit 40 is constituted by a pair of rollers so that the paper on which the image is fixed can be discharged to the outside.

In addition, between each of the paper feed unit 10, the transfer unit 20, the fixing unit 30, and the discharge unit 40, a paper feed guide 50 for guiding paper transfer to each unit is provided. .

Paper detection sensor 70 is installed on the left and right sides of each paper transport guides 53, 55, 57 so as to detect the width of the paper passing through each unit between the respective units (10, 20, 30, 40) do. In addition, the left and right sensors are installed to form a straight line perpendicular to the paper conveying direction so as to confirm the arrival time of the paper. The paper sensor 70 may be used as long as it is a sensor of a type capable of detecting the width of the paper regardless of contact or non-contact. In the present invention, various embodiments may be configured according to the arrangement of the sheet sensor 70. Some representative examples of the arrangement example of the various sheet sensor 70 are as follows.

In the first embodiment, as shown in FIGS. 2 and 3, six paper detection sensors include a front left and right sides of a paper transfer guide 53 between the paper feeding unit 10 and the transfer unit 20, and a transfer unit ( 20 and left and right sides of the front end of the paper conveyance guide part 55 between the fixing unit 30, and the front left and right sides of the paper conveyance guide part 57 between the fixing unit 30 and the discharge unit 40. At this time, the two sensors 72 installed in proximity to the paper feeding unit 10 are called feeding sensors, and the two sensors 74 installed in proximity to the transfer unit 20 are called post-transfer sensors, and the fixing unit 30 The two sensors 76 installed in close proximity to each other are called post-fixed sensors.

In the second embodiment, as shown in FIG. 4, twelve sheet sensors are provided at the left and right sides of the front and rear ends of the paper transfer guide unit 53 between the paper feeding unit 10 and the transfer unit 20, and the transfer unit 20. And left and right sides of the front and rear ends of the paper conveyance guide part 55 between the fusing unit 30 and the fusing unit 30, and the front and rear ends of the paper conveying guide part 57 between the fixing unit 30 and the discharge unit 40. It is. At this time, the twelve paper detection sensors are arranged in a straight line with the two sensors installed in a line close to the paper feed unit 10, the paper feed sensor 72, the pre-transfer sensor 73, the post-transfer sensor 74, the pre-fixed sensor 75 ), Post-fixed sensor 76, and discharge sensor 77.

In the third embodiment, as shown in FIG. 5, six paper detection sensors are provided at the rear left and right sides of the paper transfer guide 53 between the paper feeding unit 10 and the transfer unit 20, and the transfer unit 20. The left and right sides of the rear end of the paper transfer guide portion 55 between the fixing unit 30 and the rear end left and right sides of the paper transfer guide portion 57 between the fixing unit 30 and the discharge unit 40 are provided. In this case, the two sensors 73 installed in proximity to the transfer unit 20 are referred to as pre-transfer sensors, and the two sensors 75 installed in proximity to the fixing unit 30 are referred to as pre-fixed sensors. The two sensors 77 installed close to each other are referred to as a discharge sensor.

In the fourth embodiment, as shown in FIG. 6, four paper sensors are installed in front and rear of the fixing unit 30 so as to detect the width of the paper passing through the fixing unit 30.

In addition, although not shown in the drawings, a control unit for controlling each of the units constituting the image forming apparatus is included, and it is natural that the control unit is equipped with a program for separately controlling each unit according to a signal from the sensor.

Hereinafter, the operation of the image forming apparatus having the automatic jam removing function having the above configuration will be described. First, a first embodiment in which a paper sensor is arranged as shown in FIGS. 2 and 3 will be described.

The pickup roller 13 picks up the paper loaded in the paper feed cassette 11 and transfers it to the paper feed roller 15, and the paper feed roller 15 supplies this paper to the transfer unit 20. The sheet past the paper feed roller 15 moves to the transfer unit 20 while operating the paper feed sensor 72. At this time, the feed sensor 72 is located on the rear of the feed roller 15 in a straight line perpendicular to the advancing direction of the paper, so that the pick-up roller 13 is disposed so that the paper detection sensors can detect the width of the paper. It is detected whether the paper picked up by the paper reaches within a predetermined time. In addition, since the paper feed sensor 72 can detect the left and right ends of the paper passing through, the paper also detects the meandering. That is, when the paper meanders to the right side, the sensor on the right side remains ON, but the sensor on the left side turns off, so that the paper meandering can be detected. Here, meandering means that the paper is conveyed with a slight inclination with respect to the advancing direction.

If the paper feed sensor 72 does not operate within a predetermined time after the paper is picked up, or if only one of the two sensors operates, the paper feed roller 15 is reversed for a predetermined time. After the reverse rotation for a predetermined time, the paper feed roller 15 is rotated again in the paper feed direction to transfer the paper to the transfer roller 24. At this time, it is determined whether the paper feed sensor 72 operates again. If any of the feed sensors 72 do not operate, the feed roller 15 is rotated again and then rotated forward again to feed the paper. This operation is repeated until the two sensors, the paper feed sensor 72, operate normally. This is done by the controller (not shown) controlling each unit of the image forming machine changing the rotation direction of the motor (not shown) driving the paper feed roller 15.

However, if the paper feed sensor 72 does not operate normally even when the reverse rotation and the forward rotation are repeated, this process may be repeated indefinitely. Therefore, when the paper feed sensor 72 does not operate normally even when the paper feed roller 15 is rotated in a predetermined number of times, the user can remove the jam directly. At this time, the predetermined number of times can be determined by experimentally obtaining the number of times the jammed paper is released by forward and reverse operation.

The paper passing through the paper feeder 72 within the predetermined time and operating both paper feeders enters between the transfer roller 24 and the photosensitive drum 22 and is transferred onto the paper on which the image formed on the photosensitive drum 22 enters. do.

The sheet having the transferred image is conveyed to the fixing unit 30 along the sheet guide portion 55.

The paper passing the transfer unit 20 passes over the post-transfer sensor 74 to operate two sensors. If the post-transfer sensor 74 does not operate within a predetermined time or only one of the two sensors operates, the roller of the transfer unit 20 rotates in the reverse direction to move the paper a predetermined distance in the reverse direction. Thereafter, the transfer unit 20 operates in the forward direction so that the paper passes over the post-transfer sensor 74 again. At this time, it is again determined whether both transfer sensors 74 operate normally. If the normal operation does not work, the repeat operation continues as with the paper feeding unit 10. In addition, when the post-transfer sensor 74 does not operate properly even after a predetermined number of times, the occurrence of jam is displayed to the outside as described above.

The paper which normally operates the post-transfer sensor 74 enters the fixing unit 30 along the paper feed guide 55. The image on the paper entered between the heating roller 32 and the pressure roller 34 of the fixing unit 30 is fixed to the paper by the heat and pressure of the fixing unit 30.

Paper passing through the fixing unit 30 moves to the discharge unit 40 while operating the sensor 76 after fixing. At this time, after fixing the sensor 76 detects the state of the paper being conveyed in the same way as the previous paper feed sensor (72). If the paper supplied from the fixing unit 30 does not operate the sensor 76 after fixing within a predetermined time or only one of the sensors is operated, the rollers of the fixing unit 30 are reversed and rotated forward to fix. The rear sensor operates normally to discharge the paper to the outside. In this case, even after a predetermined number of forward and reverse operations, when the sensor does not operate normally, jams are displayed to the outside.

The image forming apparatus having the automatic jam removing function having the arrangement of the paper detection sensors according to the second, third and fourth embodiments also operates in the same manner as the image forming apparatus of the first embodiment described above, and thus the detailed description is omitted. do.

As described above, an automatic jam removing method for automatically detecting a paper jam by detecting the state of the paper by the paper sensor in the image forming apparatus having the automatic jam removing function and automatically removing the jam will be described in detail.

Referring to FIG. 7, the automatic jam removing method first determines whether the paper to be conveyed meanders (S10). At this time, the paper jam, meandering, and meandering amount can be determined by comparing the time at which any one of the paper detection sensors capable of sensing the left and right sides of the paper and the time at which the two sensors are operated. If the meandering amount of the paper is within the prescribed value, the subsequent printing process is continued (S40). In other words, if the paper sensor is a paper feed sensor, the paper enters the transfer unit and the image is transferred to the paper.

If the amount of meandering of the paper is more than the prescribed value, the paper is followed (S20). That is, the paper is reversed by stopping the motor for operating the roller and rotating the motor in the reverse direction again. When the paper is conveyed to the rear of the predetermined distance again by rotating the motor in the forward direction to convey the paper forward (S30). After that, the paper sensor detects whether the paper is meandering (S10). If the amount of paper meandering is more than the specified value, the back-and-forth operation of moving the paper backwards and forwarding is continuously repeated so that the paper meandering is within the specified value.

At this time, if the meandering of the paper does not fall within the prescribed value within a predetermined number, it is preferable to add a step of displaying the jam occurrence to the outside. In other words. After determining whether the paper meanders as shown in FIG. 8 (S10), if the paper is in a meandering state, it is determined whether the number of times the paper has been reversed again is a predetermined number or less (S100). Therefore, if the number of times of paper trailing is more than the predetermined number of times, the occurrence of jam is displayed (S110).

The jam removing method detects the meandering of the paper in advance so that the paper is conveyed normally, so that the meandered paper is jammed and wrinkled.

According to the image forming apparatus and the automatic jam removing method having the automatic jam removing function as described above, even if a jam occurs on the paper, the jam may be automatically removed, so that the jammed paper is wrinkled or rolled on the roller to damage the image forming machine. You will not. In addition, the inconvenience that the user must remove the jammed paper directly is reduced.

As described above, according to the image forming apparatus having the automatic jam removing function according to the present invention, not only the jam of the paper can be detected but also the jam state of the paper can be automatically solved and discharged even when the paper is jammed.

In addition, according to the jam removing method according to the present invention, the jam of the paper can be automatically removed by detecting the meandering of the paper in advance so that the paper is conveyed normally.

The present invention is not limited to the above-described specific embodiments, and various modifications can be made by those skilled in the art without departing from the gist of the invention as claimed in the claims. Such changes are intended to fall within the scope of the claims.

1 is a view showing the arrangement of a sheet sensor in an image forming machine according to the prior art;

2 is a view showing the arrangement of a sensor for detecting a paper in the first embodiment of the image forming apparatus having an automatic jam removing function according to the present invention;

3 is a plan view of the sensor arrangement of FIG.

4 is a view showing the arrangement of a sensor for detecting a paper in a second embodiment of the image forming apparatus having an automatic jam removing function according to the present invention;

5 is a view showing the arrangement of the sensor for detecting the paper in the third embodiment of the image forming apparatus having an automatic jam removing function according to the present invention;

6 is a view showing the arrangement of a sensor for detecting a sheet in a fourth embodiment of the image forming apparatus having an automatic jam removing function according to the present invention; and

7 is a flowchart showing an embodiment of an automatic jam removing method according to the present invention;

8 is a flowchart showing another embodiment of the automatic jam removing method according to the present invention.

* Description of the symbols for the main parts of the drawings *

10; Paper feeding unit 11; Paper Feed Cassette

13; Pickup roller 15; Feed Roller

20; Transfer unit 22; Photosensitive drum

24; Transfer roller 30; Fusing Unit

32; Heating roller 34; Press Roller

40; Discharge unit 50,53,55,57; Paper Transfer Guide

70; Paper sensor 72; Feed sensor

73; Pre-transfer sensor 74; Post transfer sensor

75; Pre-fixed sensor 76; Sensor after fixing

77; Badge sensor

Claims (13)

It includes a paper feeding unit for supplying paper, a transfer unit for transferring the image formed by the image forming unit to the paper conveyed from the paper feeding unit, and a paper moving path, and a paper conveying guide for guiding the conveyance of the paper. In the image forming machine, A paper feed sensor and a pre-transfer sensor installed on the front left and right sides and the rear left and right sides of the paper transfer guide unit between the paper feeding unit and the transfer unit to sense the width of the paper supplied from the paper feeding unit, Check whether the paper fed from the paper feeding unit is meandered by the paper feeding sensor or the pre-transfer sensor, and when the paper is meandering, the paper feeding unit is supplied in a normal manner by repeatedly operating the paper feeding unit in the reverse direction and in the forward direction. An image forming machine having an automatic jam removing function, characterized in that to make. The method of claim 1, A fixing unit for fixing the image transferred onto the paper to the paper; A discharge unit for discharging the paper on which the image is fixed from the fixing unit to the outside; And It is installed on the front left and right sides of the paper transfer guide portion between the fixing unit and the discharge unit, and further comprising a post-fusing sensor for detecting the width of the paper supplied from the fixing unit, After the fixing, the sensor checks whether the paper fed from the fixing unit is meandering, and when the paper is meandering, repeatedly operates the fixing unit in the reverse direction and the forward direction so that the paper is normally supplied. An image forming machine having an automatic jam removing function. The apparatus of claim 2, further comprising a post-transfer sensor installed at left and right sides of the front end of the paper transfer guide unit between the transfer unit and the fixing unit, and detecting a width of the paper supplied from the transfer unit. Check whether the paper fed from the transfer unit is meandered by the post-transfer sensor, and if the paper meanders, repeat operation of the transfer unit in the reverse direction and the forward direction so that the paper is normally supplied. An image forming machine having an automatic jam removing function. 4. The pre-fusing sensor and the discharge sensor according to claim 3, wherein the pre-fusing sensor and the discharge sensor are installed between the transfer unit and the fixing unit and at the rear left and right sides of each of the paper transfer guides between the fixing unit and the discharge unit, and detect the width of the paper passing through. Image forming apparatus having an automatic jam removing function characterized in that it further comprises. 4. An image forming apparatus having an automatic jam removing function according to any one of claims 1 to 3, wherein a jam is displayed when the sheet meanders even after the predetermined number of times of repeating the operation. A paper feeding unit which stores paper and supplies the paper one by one; An image forming unit for forming an image to be printed; A transfer unit for transferring the image formed by the image forming unit to the paper conveyed from a paper feeding unit; A fixing unit for fixing the image transferred onto the paper to the paper; A discharge unit for discharging the paper on which the image is fixed from the fixing unit to the outside; A paper transfer guide unit installed between the units and guiding movement of the paper; And And a pre-transfer sensor installed at the rear left and right sides of the paper transfer guide unit between the paper feeding unit and the transfer unit, and detecting a width of the paper supplied from the paper feeding unit. Check whether the paper fed from the paper feeding unit is meandered by the pre-transfer sensor, and when the paper is meandering, repeatedly operates the paper feeding unit in the reverse direction and in the forward direction so that the paper is supplied normally. An image forming machine having an automatic jam removing function. The apparatus of claim 6, further comprising a discharge sensor installed at the rear left and right sides of the paper transfer guide unit between the fixing unit and the discharge unit and detecting a width of the paper supplied from the fixing unit. Check whether the paper fed from the fixing unit is meandered by the discharge sensor, and when the paper meanders, the paper is supplied normally by repeatedly operating the fixing unit in the reverse and forward directions. Image forming machine with automatic jam removal function. According to claim 7, It is installed on the left and right sides of the front end of the paper transfer guide portion between the transfer unit and the fixing unit, and further comprises a pre-fusing sensor for detecting the width of the paper supplied from the transfer unit, Check whether the paper fed from the transfer unit is meandered by the pre-fusing sensor, and if the paper meanders, repeat operation of the transfer unit in the reverse direction and the forward direction so that the paper is supplied normally. An image forming machine having an automatic jam removing function. The image forming apparatus according to any one of claims 6 to 8, wherein the jam is displayed when the paper meanders even after the predetermined number of repeated operations are performed. A paper feeding unit which stores paper and supplies the paper one by one; An image forming unit for forming an image to be printed; A transfer unit for transferring the image formed by the image forming unit to the paper conveyed from a paper feeding unit; A fixing unit for fixing the image transferred onto the paper to the paper; A discharge unit for discharging the paper on which the image is fixed from the fixing unit to the outside; A paper transfer guide unit installed between the units and guiding movement of the paper; And And installed at front left and right sides and rear left and right sides of the fixing unit and detecting a width of the paper supplied from the transfer unit. The sensor checks whether the paper fed from the transfer unit is meandered, and when the paper meanders, the transfer unit or fixing unit is repeatedly operated in a reverse direction and a forward direction so that the paper is normally supplied. Image forming machine having an automatic jam removing function, characterized in that. 11. An image forming apparatus having an automatic jam removing function according to claim 10, wherein a jam is displayed when the sheet meanders even after the predetermined number of repeat operations have been performed. In the automatic jam removal method of the image forming machine is installed on the left and right sides of the paper transfer guide for guiding the paper transfer, and having a sensor for detecting the width of the paper to be transferred, Determining whether the paper meanders; If the paper meanders, backing the paper a distance; Conveying the trailing paper to the front again; Repeating the steps until the paper does not meander. 13. The automatic jam removing method of claim 12, wherein when the step of trailing the paper is a predetermined number or more, a jam occurrence indication is displayed.