JP2000010369A - Image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To more reliably automatically load a paper sheet even if a paper sheet carrying passage is long in an image forming device for printing a continuous paper sheet by an electrophotographic method. SOLUTION: A paper sheet carrying device 2 has a paper sheet driving mechanism being arranged on the upstream side of photosensitive drums 9, 10 in a paper sheet carrying passage, imparting downstream directional reciprocal feeding motion to a paper sheet 3 and being controlled in driving by the control part, a scuff roller 18 being arranged on the downstream side of the photosensitive drums 9, 10 in the paper sheet carrying passage and imparting feeding directional tensile force to the paper sheet 3 and paper sheet detecting means being arranged in a plurality along the paper sheet carrying passage and offering information on the existence of the paper sheet 3 to the control part so that the control part controls the paper sheet driving mechanism to perform at least one time or more retrials when failing in a first time trial when trying automatic loading for enabling the forefront part of the paper sheet 3 to reach the scuff roller 18 by normally driving the paper sheet driving mechanism in which the forefront part of the paper sheet 3 is set.

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 performing electrophotographic printing on continuous paper, and more particularly, to an improved image forming apparatus capable of more reliably performing automatic loading of continuous paper.

[0002]

2. Description of the Related Art In an image forming apparatus that performs printing by an electrophotographic method, a toner image on a photosensitive drum is transferred and fixed onto a sheet while the sheet is conveyed along a predetermined conveying path by a sheet conveying mechanism. Print is performed. Then, when printing on continuous paper, the paper transport mechanism is
For example, a tractor for forcibly feeding a sheet is disposed upstream of the photosensitive drum, and a scuff roller that applies a pulling force to the sheet in the feed direction is disposed downstream of the photosensitive drum. As a result, continuous paper whose feed speed is regulated by the tractor so as to match the peripheral speed of the photosensitive drum is continuously transported while being given a constant tension. Thus, the continuous paper is conveyed while appropriately contacting the photosensitive drum, and the transfer of the toner image is properly performed.

[0003] Proper printing is possible only when continuous paper exists between the tractor on the upstream side of the photosensitive drum and the scuff roller on the downstream side as described above. Therefore, when loading continuous paper, it is necessary to extend the leading end from the tractor to the scuff roller. For example, if the image forming apparatus is large and prints on both sides, the distance from the tractor to the scuff roller will be considerably long. The task of manually loading paper is very difficult because the parts that you do not want to be crowded are dense. Therefore, this type of image forming apparatus is generally configured to be able to automatically load paper. That is, when the leading portion of the paper is set on the tractor and the auto load function is operated, the tractor is driven forward and the leading edge of the paper is sent to the downstream side, and the paper is automatically guided by a guide or the like to the scuff roller. Can be reached.

[0004]

However, the above-mentioned auto-loading is not to pull the leading end of the paper, but to feed the paper to the leading end to the scuff-roller. If the paper has a fold, the paper jam is likely to occur due to the leading edge of the paper being caught by a guide or the like in the middle of the transport path. In particular, as described above, the image forming apparatus performs printing on both the front and back sides of a sheet, and when the sheet transport path is long and the distance to which the leading end of the sheet is to be sent out is long, the above-described auto-loading is more desirable. Paper jam easily occurs.

[0005] When the automatic loading fails due to the paper jam, the fact that the paper jam has occurred or the location of the paper jam is conventionally displayed, and the manual loading is left to the user.

The present invention has been conceived under such circumstances. In an image forming apparatus that performs printing on continuous paper by an electrophotographic method, even if the paper transport path is long, the present invention is more reliable. The task is to enable automatic loading of paper.

[0007]

DISCLOSURE OF THE INVENTION In order to solve the above problems, the present invention employs the following technical means.

That is, the image forming apparatus provided by the first aspect of the present invention transfers and fixes a toner image on a photosensitive drum to a continuous sheet conveyed by a sheet conveying device along a predetermined sheet conveying path. In the image forming apparatus, the paper transporting device is disposed upstream of the photosensitive drum in the paper transporting path, applies forward and reverse feeding to the paper in a downstream direction, and is driven and controlled by a control unit. A paper drive mechanism, a scaffolder disposed downstream of the photosensitive drum in the paper transport path and applying a pulling force to the paper in the feed direction, and a plurality of scaffolders disposed along the paper transport path and controlling the presence / absence information of the paper. The control unit drives the paper driving mechanism in which the leading portion of the paper is set to the forward direction to scuff the leading edge of the paper. Upon attempting to autoload to bring La, when failed in the first try it is characterized in that for controlling the paper drive mechanism to perform at least one or more retries.

For example, when the leading portion of the continuous paper is set in a paper driving mechanism composed of a tractor and the auto load function is started, the paper driving mechanism is driven forward, and the paper is moved so that the leading portion of the paper reaches the scuff roller. Send out. When it is detected that the top of the sheet has reached the scuff roller or its vicinity, it is determined that the auto load has been normally performed, and the auto load function is stopped. On the other hand, if it is not detected that the leading end of the sheet has reached the scuff load or its vicinity, it is determined that the automatic loading has failed, and the retry is performed at least once or more. That is,
The paper driving mechanism is driven in reverse, the paper is pulled back until the leading end returns to, for example, the initial set position, and then the paper driving mechanism is driven forward again. If it is determined by this retry that the autoloading has been performed normally, the autoloading function stops. On the other hand, if it is determined that the auto-loading has failed even after the retry, the re-trying is performed, or a warning or an audible warning that the auto-loading has failed is issued, or the manual paper loading is prompted. Display.

[0010] As described above, according to the first aspect of the present invention, when the first auto-loading of the sheet fails, at least one retry is performed, so that the probability that the auto-loading will eventually succeed is reduced. Increase.

In a preferred embodiment, when retrying the autoload, the control unit controls the paper driving mechanism to feed the paper at a speed different from the paper feeding speed in the previous trial. More specifically, the paper feed speed in the retry is made lower than the paper feed speed in the previous trial. When the sheet is slowly fed, the leading portion of the sheet is more reliably guided on a predetermined transport path by a guide or the like. Therefore, according to such a configuration, the probability that the autoloading will eventually succeed increases.

In a preferred embodiment, the apparatus further comprises a display unit controlled by the control unit.
The control unit displays a message prompting the user to cut off the leading edge of the sheet in a state where the leading edge of the sheet is returned to the set position when retrying the auto load. If the user cuts the leading part of the continuous paper according to such a display, for example, the folded part at the head of the paper, which was the cause of the failure of the first automatic loading, is removed. The probability of success increases. In the case of using continuous paper in a form in which perforations are formed at predetermined lengths, it is easy to cut off the leading portion of the paper as described above.

In a preferred embodiment, the apparatus further includes a display unit controlled by the control unit, and the control unit performs a display prompting the user to cut the sheet at a predetermined portion when retrying the automatic loading. . If the user cuts the middle part of the continuous paper according to such a display and removes the leading part, for example, the folded part of the paper that caused the failure in the first auto load is removed. Therefore, the probability that the autoload in the retry succeeds increases. In the case of using continuous paper in a form in which perforations are formed at predetermined lengths, it is easy to cut a predetermined portion of the paper as described above. In such a case, a second paper driving mechanism driven and controlled by the control unit is further provided downstream of the photosensitive drum, and the control unit controls the second paper driving mechanism to discharge the cut paper. When the mechanism is controlled, the cut downstream paper is automatically ejected along the transport path, so that a situation in which the photosensitive drum or the like is damaged when removing the cut paper is avoided, and The work required of the user becomes easier.

The image forming apparatus provided by the second aspect of the present invention is configured to transfer and fix a toner image on a photosensitive drum to a continuous sheet conveyed by a sheet conveying device along a predetermined sheet conveying path. An image forming apparatus, wherein the paper transport device is disposed upstream of the photosensitive drum in a paper transport path, and feeds paper in forward and reverse directions in a downstream direction and is driven and controlled by a control unit. A drive mechanism, a scuff roller arranged downstream of the photosensitive drum in the paper transport path to apply a pulling force to the paper in the feed direction, and a plurality of scuff rollers arranged along the paper transport path to provide the presence / absence information of the paper to the controller. The control unit drives the paper driving mechanism in which the leading portion of the sheet is set forward to move the leading portion of the sheet to the scuff roller. That upon attempt to auto load, it is characterized by performing control to vary the speed at which the leading end of the sheet passes through the predetermined section of the sheet conveying path as the velocity through the other sections.

For example, when the leading portion of the continuous paper is set in a paper driving mechanism composed of a tractor and the auto load function is started, the paper driving mechanism is driven forward, and the paper is moved so that the leading portion of the paper reaches the scuff roller. The paper is sent out, and the sending speed is made different depending on which part of the transport path the paper head passes. For example, when the leading end of the sheet passes through a portion that is easily caught, the feeding speed is set lower than when passing through other portions. By doing so, the probability of failure can be significantly reduced while autoloading is performed quickly.

[0016] Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the drawings.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a schematic overall configuration diagram of an embodiment of an electrophotographic image forming apparatus 1 provided with a sheet conveying device 2 characterized by the present invention, and FIG. 2 is a block diagram.

In FIG. 1, the image forming apparatus 1 is configured so as to be able to print on the front and back surfaces of continuous paper by an electrophotographic method. In the state shown in FIG. 1, the continuous paper 3 is loaded in a printable state. In the paper hopper 4, for example, continuous holes 3 in which feed holes are formed at equal intervals on both sides in the width direction and perforations are formed at predetermined lengths are loaded in a zigzag manner. The sheet 3 pulled out from the sheet hopper 4 passes through a tractor 5 as a sheet driving mechanism. The tractor 5 includes a plurality of projections 61 that are arranged in a pair on the left and right corresponding to the width of the sheet and engage with feed holes formed on the left and right side edges of the sheet 3.
By rotating the tractor belt 6 having a force, the paper 3 is forcibly fed in the forward and reverse directions. The tractor belt 6 is wound around front and rear pulleys 6a and 6b. Preferably, the front pulley is driven to rotate in the forward and reverse directions by a motor (not shown). This motor is controlled by the control unit 7
According to FIG. 2, the rotation direction and the rotation speed are controlled as predetermined.

The paper 3 that has left the tractor 5 changes its direction by the guide 8 and moves upward. The first photosensitive drum 9 for transferring the toner image to the back side of the sheet and the second photosensitive drum 10 for transferring the toner image to the front side of the sheet are adjacent to the upward conveying path. They are arranged with their positions shifted in the transport direction. Further, the photosensitive drums 9 and 10 are opposed to each other with the paper 3 interposed therebetween,
Transfer units 11 and 12 are provided. Each photosensitive drum 9,
In 10, an electrostatic latent image is formed by an electrostatic latent image forming device 13, and the electrostatic latent image is developed by a developing device 14 to form toner images on the photosensitive drums 9 and 10. This toner image is transferred to the sheet 3 by the transfer devices 11 and 12. A fixing device 15 for thermally fixing the toner image transferred to the back side of the sheet is disposed downstream of the photosensitive drums 9 and 10 in the upward transport path.

The conveying path heading upward is the guide roller 1
6, a fixing device 17 for thermally fixing the toner image transferred to the front side of the sheet 3 is disposed downstream of the guide roller 16. A scuff roller 18 and a pinch roller 19 are arranged downstream of the fixing device 17 so as to sandwich the sheet 3. These scuff Flora 18
And the printed paper 3 that has passed through the pinch roller 19,
It is stored in the stacker 20 in a folded state.

In the printing state, the tractor 5 basically rotates in synchronization with each of the photosensitive drums 9 and 10, and feeds the continuous paper 3 at the same speed as the peripheral speed of each of the photosensitive drums 9 and 10. On the other hand, the peripheral speed of the scuff roller 18 is set to be higher than the sheet feeding speed. That is, the scuff roller 18 and the pinch roller 19 always pull the sheet 3 in the feed direction by the sliding friction force, apply an appropriate tension to the sheet traveling between the scuff roller 18 and the tractor 5, and apply the sheet to each sheet. The photosensitive drums 9 and 10 are brought into proper contact with the peripheral surfaces thereof.

In FIG. 1, reference numerals 1 to 3 denote a plurality of sensors arranged along the paper transport path from the tractor 5 to the scuff roller 18 to detect the presence or absence of the paper. A non-contact reflection type photosensor is used, which detects the presence or absence of an object by detecting the reflected light from the object with a light receiving element. These sensors ~
Is provided to the control unit 7 (FIG. 2). In FIG. 1, reference numeral 21 denotes a feed roller as a second sheet drive mechanism for contacting the sheet 3 when necessary and forcibly feeding the sheet to a downstream side or a discharge path indicated by a virtual line. The feed roller 21 is also provided with the control unit 7 (FIG. 2).
Is controlled and driven. Although not shown, guide means for defining the paper transport path are appropriately provided. However, in the embodiment shown in the drawings, there are many sections in which a sheet in which the toner images on the front and back sides are not fixed remains conveyed, and in such a section, it is not possible to provide a guide means for contacting the print area of the sheet.

Although the continuous paper 3 is continuous, its length is finite. As described above, in order to load the continuous paper 3 into a printable state, the continuous paper 3 needs to pass from the tractor 5 to the scuff roller 18. The image forming apparatus 1 according to the present invention has an automatic loading function for automatically performing such sheet loading. In this case, the user sets the leading portion of the sheet on the tractor 5. Then, when the automatic loading function is started, the tractor 5 is driven in the forward direction, and the paper 3 is sent out. The sheet is led to the scuff roller 18 while being guided by a guide or the like, and the auto loading is completed.

In the present invention, the tractor 5 and the feed roller 21 are controlled by the control unit 7 during such an automatic loading function, as shown in FIG. As described above, the tractor 5 has its forward and reverse rotation directions (paper feed direction) and rotation speed (paper feed speed) controlled. The feed roller 21 is controlled so as to contact the cut sheet and discharge the sheet as necessary. The control unit 7 also performs control for performing a predetermined display on the display unit 22 provided at an appropriate part of the image forming apparatus 1. In addition, information on the presence or absence of the sheet from the sensor and information from the open / close sensor 23 of the maintenance cover provided on the front surface of the apparatus are input to the control unit 7. The control unit 7 is configured by, for example, a microcomputer.

Next, a first control example by the control unit 7 will be described with reference to the flowcharts of FIGS.

When the autoloading function is started by the user turning on the switch while the leading end of the continuous paper 3 is set in the tractor 5, the counter in the control unit is set to 1 (S101). Is driven to rotate forward at a preset speed (S102), and a timer in the control unit is started (S102).
103). As a result, the continuous paper is sent out on the downstream side of the transport path. Then, it is detected whether or not the leading portion of the sheet is normally traveling on the transport path. That is, as shown in FIG. 1, a total of six paper sensors are arranged in the middle of the transport path from the tractor 5 to the scuff roller 18, but every predetermined time after the timer starts as described above. Then, the paper 3 is
Is checked (S104).
To S109). If the sheet has passed through all the sensors within each predetermined time (S104 to S109: N
O), indicating that the leading edge of the sheet has reached the scuff roller 18 without any problem, the tractor 5 is stopped assuming that the auto load has succeeded (S109a), and the auto load function ends.

On the other hand, for example, if the leading edge of the sheet has not reached the sensor within a predetermined time (S104: NO), it indicates that the sheet has already jammed between the tractor 5 and the sensor. In this case, the tractor 5 is stopped (S110), and it is determined whether the counter has reached the set number of times, that is, whether the number of autoload attempts has reached the predetermined number of times, for example, three (S11).
1) If the number has reached the predetermined number (S111: Y
ES), a warning is displayed (S117), and the auto load function ends. This warning is displayed by, for example, displaying on the display section that "Autoloading has failed. Open the front cover and manually load the paper."

If the number of times of the auto-load trial in which the paper jam has occurred has not reached the predetermined number (S111: NO), the auto-load is retried as follows. First, the sheet is returned to the initial set state by driving the tractor 5 in reverse until the sensor is turned off (S112), and a message is displayed indicating that the sheet head is cut off if necessary (S113). That is, for example, a notice is displayed, such as "Perform auto loading again. Open the front cover and remove the leading edge of the paper at the perforation." By confirming that the front cover has been closed, it is determined that the leading portion of the sheet has been cut off in accordance with the above-mentioned notice (S114: YES), and the set speed of the tractor 5 is set to a lower speed than in the previous trial (S114). (S115), 1 is added to the counter (S11).
6), repeat the steps from S102. In this way, when the auto-loading fails, the leading edge of the paper is cut off at the perforation, thereby removing the fold at the leading edge of the paper, which is a cause of most of the auto-loading failures. The probability of success increases. Also, by making the feed speed of the tractor 5 in the retry slower than the speed in the previous retry, the probability of success in the retry is increased.

If the head of the sheet does not reach the sensor within a predetermined time (S105: NO), it is determined that the sheet has jammed between the sensors, and if the sheet does not reach the sensor (S106: NO). If the paper does not reach the sensor (S107: NO), the sensor informs the sensor that the paper has jammed between the sensors. If not (S108: NO), it indicates that a jam has occurred between the sensors. In these cases, the retry is performed as described above unless the number of trials reaches the set number.

If the head of the sheet does not reach the sensor within the predetermined time (S109: NO), it indicates that the sheet has jammed between the sensors. In this case, in this control example, Instead of returning the sheet to the original set position and performing the retry as described above, the front portion of the sheet is removed in that state and the retry is performed. The tractor 5 is stopped (S118), and it is checked whether the number of trials has reached a predetermined number (S119). If the number of trials has not reached the predetermined number (S119: NO), the sheet is cut at a predetermined portion. Is displayed (S120).
This display is, for example, a reminder display that "Retry auto loading. Open the front cover and cut the paper at the perforation near the blinking display." Then, in addition to the notice display, the vicinity between the sensors is blinked on a liquid crystal display or the like that schematically shows the transport route. By confirming that the front cover has been closed, it is determined that the sheet has been cut in accordance with the above notification (S121: YES), and the feed roller 21 has been cut.
To remove the paper downstream of the cut section. The removal of the removed paper may be performed by sending the transport path to the downstream side, or by sending a separately provided discharge path as shown by a virtual line in FIG. Then, 1 is added to the counter (S122a), and the tractor 5 is driven again in the forward direction (S123). It returns to S109. When the number of trials that caused the jam has reached the set number (SS119: Y
ES), a warning is displayed (S125), and the auto-load function is terminated as in the above. In this case as well, the retry is performed after the jammed sheet head is removed, so that the probability of success is increased.

Next, a second control example by the control unit 7 will be described with reference to the flowchart of FIG.

In this control, the sheet feeding speed when the leading portion of the sheet passes through the section where the sheet jam is likely to occur in the sheet conveying path is made slower than the sheet feeding speed when passing through the other sections, thereby enabling the automatic loading. Is to increase the probability of success. In this control example, the section indicated by the reference numerals A and B in FIG. 1, that is, the sheet feed speed when the head of the sheet passes through the fixing units 15 and 17 is reduced.

First, in a state where the leading end of the continuous paper 3 is set on the tractor 5, when the auto load function is started by a user turning on a switch or the like,
The tractor 5 is driven forward at a preset speed (S2
01). Then, it is sequentially confirmed that the leading portion of the sheet has passed through the sensor, the sensor, and the sensor (S202 to
(S204) When the head of the sheet reaches the sensor (S204: YES), the tractor 5 is decelerated (S2).
05). As a result, the speed at which the leading portion of the sheet passes through the first fixing device 15 becomes slower than the speed before that. Next, when the leading portion of the sheet has passed the sensor, that is, when the leading portion of the sheet has passed through the first fixing device 15 (S206: YES), the speed of the tractor 5 is increased to its original speed (S207). . Then, when the leading edge of the sheet reaches the sensor in front of the second fixing device 17 (S20).
8: YES), and reduce the tractor speed again (S20)
9) At the time when the sensor reaches the sensor at the outlet of the second fixing device (S210), the tractor speed is increased to the original speed, and finally the tractor 5 is stopped (S211), and the auto load function ends. .

Of course, the scope of the present invention is not limited to the above embodiment. First, in the embodiment,
Although the image forming apparatus that performs electrophotographic printing on the front and back surfaces of a sheet has been described as an example, the invention is not limited to this, and the present invention can be similarly applied to an image forming apparatus that performs printing on only one side of a sheet. Further, in the first control example, the head of the sheet is notified at the time of retrying. However, the case where the retry is performed simply without performing such a step is, of course, included in the scope of the present invention. Further, in the first control example, the tractor speed is reduced at the time of retry, but a case where the tractor is retried at the same speed as the previous time is, of course, included in the scope of the present invention. In addition, a case where control is performed by combining the first control example and the second control example is, of course, included in the scope of the present invention.

[0036]

As described above, according to the present invention, in an image forming apparatus which performs printing on continuous paper in an electrophotographic manner, if an attempt to auto-load a paper fails, a retry is performed. Finally, the probability of successful autoloading increases.

According to the present invention, when performing the automatic loading, the paper feeding speed in the conveyance section where the paper jam is likely to occur is made slower than the feeding speed in the other sections. While ensuring a higher probability of success.

As a result, a practical paper auto-loading function can be achieved even when the paper transport path is long.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram illustrating an example of an electrophotographic image forming apparatus according to the present invention.

FIG. 2 is a control block diagram of the electrophotographic image forming apparatus shown in FIG.

FIG. 3 is a flowchart illustrating a first control example of the electrophotographic image forming apparatus illustrated in FIG. 1;

FIG. 4 is a flowchart illustrating a first control example of the electrophotographic image forming apparatus illustrated in FIG. 1;

FIG. 5 is a flowchart illustrating a second control example of the electrophotographic image forming apparatus illustrated in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Image forming apparatus 2 Paper conveyance apparatus 3 Continuous paper 7 Control part 9,10 Photosensitive drum 18 Scuff roller

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H027 DC03 EE03 EE05 EK10 FA13 2H072 AA16 AA22 AA32 AB09 AB10 AB28 CA01 CA04 DA04 FB03 HA04 3F105 AA02 AB02 BA41 CA18 CB01 DA22 DA51

Claims (6)

[Claims] 1. An image forming apparatus configured to transfer and fix a toner image on a photosensitive drum to a continuous sheet conveyed by a sheet conveying device along a predetermined sheet conveying path, wherein the sheet conveying device includes: A paper drive mechanism that is disposed upstream of the photosensitive drum in the paper transport path, applies forward / reverse feed movement to the paper in the downstream direction, and is driven and controlled by the control unit; and a downstream side of the photosensitive drum in the paper transport path. And a sheet detection means for providing a sheet with presence / absence information of the sheet to the control unit, and a plurality of scuff rollers for applying a pulling force to the sheet in the feeding direction, and a sheet detection unit for providing the sheet existence information to the control unit. , The first attempt failed when trying to auto-load the paper drive mechanism with the leading edge of the paper set to the forward drive to bring the leading edge of the paper to the scuff roller. If the is characterized in that for controlling the paper drive mechanism to perform at least one or more retries, the image forming apparatus. 2. The image forming apparatus according to claim 1, wherein the control unit controls a paper driving mechanism to feed the paper at a speed different from the paper feeding speed in the previous trial when retrying the automatic loading. 3. A display unit controlled by the control unit, wherein the control unit returns the head of the sheet to the set position when retrying the auto-loading. 2. A display for prompting resection is provided.
Or the image forming apparatus according to 2. 4. The apparatus further includes a display unit controlled by the control unit, wherein the control unit performs a display prompting a cutting of a sheet at a predetermined portion when retrying auto loading.
The image forming apparatus according to claim 1. 5. A second drive controlled by the control unit.
Is further provided on the downstream side of the photosensitive drum, and the control unit controls the second unit to discharge the cut sheet.
The image forming apparatus according to claim 4, wherein the image forming apparatus controls the paper driving mechanism. 6. An image forming apparatus configured to transfer and fix a toner image on a photosensitive drum to a continuous sheet conveyed by a sheet conveying device along a predetermined sheet conveying path, wherein the sheet conveying device comprises: A paper drive mechanism that is disposed upstream of the photosensitive drum in the paper transport path, applies forward / reverse feed movement to the paper in the downstream direction, and is driven and controlled by the control unit; and a downstream side of the photosensitive drum in the paper transport path. And a sheet detection means for providing a sheet with presence / absence information of the sheet to the control unit, and a plurality of scuff rollers for applying a pulling force to the sheet in the feeding direction, and a sheet detection unit for providing the sheet existence information to the control unit. When trying to auto-load the front of the paper to the scuff roller by driving the paper drive mechanism with the front of the paper set forward, the top of the paper And performing control to vary the velocity through the predetermined section of the feed path and the velocity through the other sections,
Image forming device.