JP2011162358A - Paper feeding device and image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper feeding device surely separating paper sheets from each other by responding to a size, basis weight, and surface roughness of a paper sheet to thereby stably feed the paper sheets one by one. <P>SOLUTION: The paper feeding device includes: a paper feeding tray 31 on which a bundle of a plurality of paper sheets P is loaded thereon; a paper suction conveyance means 60 sucking the paper sheets P from the top paper sheet P of the paper bundle loaded on the paper feeding tray 31 one by one, by suction of air; and a first blowing means 40 blowing air from a side in a paper feeding direction to an upper part of the paper sheets P stacked on the paper tray 31. The paper suction conveyance means 60 includes: a suction belt 63 extended between a large roller 61 disposed upstream in the paper conveyance direction and a plurality of small rollers 62 positioned downstream of the large roller 61 and smaller in diameter than the large roller 61, and rotated by drive of the large roller 61; a suction means 64 disposed inward of the suction belt 63 to suck air; and a second blowing means 50 blowing air in a paper conveyance direction from the downstream in the paper conveyance direction to the small rollers 62. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a paper feeding device used in an image forming apparatus such as a copying machine, a printer, a facsimile machine, a printing machine, and a multifunction machine, and in particular, can reliably separate and feed paper such as coated paper one by one. The present invention relates to a paper feeding device.

  The image forming apparatus is provided with a paper feeding device that feeds one copy sheet at a time from a plurality of stacked copy paper sheets. In such a sheet feeding device, if a large number of sheets are sent out at a time, a paper jam may occur. Further, if the feeding force is small, misfeeding is likely to occur. For this reason, a device has been devised that can reliably feed one by one. That is, misfeed is prevented by reliably feeding the uppermost sheet of the stacked sheets by increasing the friction coefficient between the sheet feeding roller and the sheet. Also, in order to prevent two or more sheets from being sent, only the topmost sheet is fed by pushing back the second and subsequent sheets by rolling with a rolling roller, padding or separation claw. .

  This method is effective as long as only plain paper for ordinary copying machines is used. However, recently, the use of copying machines and printers has been expanded, and various types of paper such as coated paper have been used. Among these sheets, the adhesion between the sheets when stacked is strong, and it may be difficult to reliably prevent the feeding of a large number of sheets with the above-described sheet feeding device.

  Therefore, there is a method in which a blower opening is provided on the side in the feeding direction of the stacked sheets, air is blown from the blower opening toward a plurality of upper sheets of the stacked sheets, and air is passed between the sheets to separate them. Proposed.

  The separated sheets are sent one by one to the image forming unit by a sheet feeding roller. Some printing presses employ a method of conveying the top sheet while suctioning the top sheet.

  However, the coated paper has a characteristic that the sheets are strongly adhered to each other in a high humidity environment. A bundle of sheets that are in close contact with each other becomes a heavy lump at a low wind speed, and when the air is blown from the side, the adhesion does not peel off and the sheet cannot be lifted.

  In order to solve this problem, it is only necessary to increase the blowing of air to float the paper. However, if this is done, a large force is generated that lifts the paper sucked on the suction belt from below and presses it against the suction belt.

  When air is lifted into a gap that is weakly in close contact between papers and lifted from a bundle of paper, the separation air flow that scrapes the paper downwards even if it is blown with separation air that separates the paper from the front. In this case, the effect of separation cannot be sufficiently obtained due to the collision with the lifting air flow that tries to lift the paper together with the bundle, and double feeding of the paper occurs.

  Japanese Patent Application Laid-Open No. 2004-228561 includes sheet suction and conveyance means that sucks and conveys one sheet at a time from a sheet bundle supported by the sheet stacking means, and wind speed variable means that changes the air wind speed. This is an air feeding type sheet conveying apparatus in which only the uppermost sheet is separated by the sheet suction conveying means by performing a sheet conveying operation when is less than a predetermined value.

JP 2004-131291 A

  In order to obtain good paper separation performance, it is necessary to select an appropriate air volume for the air to be blown with respect to the paper size, basis weight, surface roughness, and the like. However, the proper conditions change even if the paper condition changes due to the surrounding greenhouse temperature environment. Also, the proper conditions change even when the paper is curled, perforated, streaked, or the like, or when dust is applied to the offset printed paper. Since the appropriate conditions are various in this way, it is almost impossible to automatically set the appropriate conditions by incorporating the appropriate conditions into the sheet feeding device from the beginning for each sheet.

  In particular, in the case of offset printing, dusting powder adheres to the paper feed roller and the like, and the paper conveyance force tends to decrease. Or, the sheets float up as a bundle, and a reliable curling effect cannot be obtained. Also, depending on the paper type, the appropriate conditions may not be compatible.

  In the means for improving the wind effect by changing the wind direction and the wind speed, the sheet conveyance resistance may be caused by the wind direction and the wind speed.

  In addition, since these air blowing units are all mounted on a paper feed tray that can be pulled out, the paper feed device becomes larger, and the image forming apparatus including the paper feed device also becomes larger. The air blowing means can be attached to a relatively large high-speed model, but is difficult to attach to a small image forming apparatus.

  The paper feeding device disclosed in Patent Document 1 is provided with air blowing means for blowing air from the side near the front end in the feeding direction of the paper loaded on the paper feeding tray. However, when feeding coated paper, thick paper with a large basis weight, large-size paper, OHP film, etc., paper separation is insufficient by simply blowing air near the sides of the paper. There is a risk of poor transport.

  The present invention is for solving the above problems, and provides a paper feeding device that can reliably separate paper with respect to paper size, basis weight, surface roughness, and the like, and stably feed the paper one by one. It is intended to provide.

  The object of the present invention is achieved by the following invention.

(1) a paper feed tray for stacking a stack of paper sheets,
A sheet adsorbing and conveying means for adsorbing and conveying one sheet at a time from the uppermost sheet of the bundle of sheets stacked on the sheet feeding tray by air suction;
First air blowing means for blowing air from the side in the paper feeding direction toward the top of the paper stacked on the paper feed tray;
In a paper feeder having
The paper suction conveying means is
It is stretched by a large roller provided on the upstream side in the paper conveying direction and a plurality of small rollers located downstream of the large roller and smaller than the diameter of the large roller, and is rotated by driving the large roller. An adsorbing belt that
A suction means provided inside the suction belt for sucking the air;
Second air blowing means for blowing air in the paper conveyance direction from the downstream side in the paper conveyance direction toward the small roller;
A sheet feeding device comprising:

  (2) The sheet feeding device according to (1), wherein the second blowing unit blows air to the front end of the sheet bundle in the sheet conveyance direction by blowing air in the vicinity of the suction belt.

  (3) The sheet feeding device according to (2), wherein the vicinity of the suction belt is near the front bottom of the suction belt.

(4) having control means for controlling the first air blowing means and the second air blowing means;
The control means causes the air to be blown by both the first air blowing means and the second air blowing means when the paper is adsorbed by the paper adsorbing and conveying means. The sheet feeding device according to any one of the above.

(5) shielding means for shielding air blowing from the first air blowing means;
Paper suction detecting means for detecting that the paper is sucked by the paper suction conveying means,
The control means controls the shielding means when the paper adsorption detection means detects that the paper is adsorbed by the paper adsorption conveyance means, and shields the blowing of air from the first air blowing means, The paper feeding device according to (4), wherein the air blowing is performed only by the second air blowing unit.

(6) a feed sensor that is disposed in the vicinity of the suction belt on the downstream side in the paper transport direction and detects the passage of the paper fed by the paper suction transport means;
When the feed sensor detects the passage of the paper, the control unit controls the shielding unit to resume the blowing of air from the first blower unit. Paper feeder.

  (7) The sheet feeding device according to any one of (1) to (6), wherein the control unit controls driving of the second air blowing unit according to a type of the sheet. .

(8) an image forming unit that forms an image on the image carrier;
A transfer unit for transferring an image on the image carrier to paper;
The sheet feeding device according to any one of (1) to (7), wherein the sheet is conveyed to the transfer unit.
An image forming apparatus comprising:

  As described above, according to the present invention, the following effects can be obtained.

  In addition to the small roller located on the downstream side of the large roller, the second air blowing means for blowing air in the paper conveyance direction from the downstream side in the paper conveyance direction toward the small roller is provided, so that the separation of the paper is improved. It becomes easy to feed out the paper. As a result, the problem that the sheet floats too much and damages the sheet, or a plurality of sheets float together and cannot be separated is solved. That is, it is possible to provide a paper feeding device that can reliably separate the paper with respect to the paper size, basis weight, surface roughness, etc., and stably feed the paper one by one.

  In addition, an image forming apparatus including a paper feeding device can prevent double feeding regardless of the type of paper, and can form an image on a paper in an image forming unit.

1 is an overall configuration diagram of an image forming apparatus including an image forming apparatus main body, an image reading apparatus, an automatic document feeder, and a large-capacity paper feeder. FIG. 3 is a perspective view illustrating a main part of the large-capacity paper feeding device according to the present invention. FIG. 3 is a front sectional view of a large capacity paper feeding device. The top view of a paper feeder. The side view of a paper feeder. Sectional drawing which shows the paper adsorption | suction conveyance process by the 1st ventilation means and the 2nd ventilation means. FIG. 3 is a block diagram illustrating a control configuration of a sheet feeding device. 6 is a timing chart showing control of the paper feeding device.

  Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to the embodiments described below.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Image forming apparatus]
FIG. 1 is an overall configuration diagram of an image forming apparatus including an image forming apparatus main body A, an image reading apparatus SC, an automatic document feeder DF, and a large-capacity paper feeder LT.

  The image forming apparatus main body A shown in FIG. 1 includes an image forming unit including a photoconductor (image carrier) 1, a charging unit 2, an image exposure unit 3, a developing unit 4, a transfer unit 5, a cleaning unit 6, and the like, and a fixing unit 7. And a paper transport system.

  The paper transport system includes a paper feed cassette 10, a first paper feed unit 11, a second paper feed unit 12, a paper discharge unit 14, a transport path switching unit 15, a circulation refeed unit 16, and a reverse paper discharge unit 17. Has been.

  The document d placed on the document table of the automatic document feeder DF is transported by the paper feeding means, and one or both side images of the document d are read by the optical system of the image reading device SC and read by the image sensor CCD. It is. The analog signal photoelectrically converted by the image sensor CCD is subjected to analog processing, A / D conversion, shading correction, image compression processing and the like in the image processing unit 20 and then sent to the image exposure apparatus 3.

  In the image forming unit, processes such as charging, exposure, development, transfer, separation, and cleaning are performed.

  In the image forming means, a charge (in this embodiment, negative charge) is applied to the photosensitive member 1 by the charging means 2, and an electrostatic latent image is formed by laser light irradiation from the image exposure device 3. The electrostatic latent image is visualized by 4 and becomes a toner image (negative charge in the present embodiment). Next, the paper P stored in the paper feed cassette 10 is conveyed from the first paper feed means 11. The paper P is conveyed in synchronism with the toner image by the second paper feeding means 12 composed of registration rollers. Thereafter, the paper P is fixed by the fixing device 7 after the toner image is transferred by the transfer means 5.

  The paper P after fixing is discharged out of the apparatus by the paper discharge means 14. On the other hand, the transfer residual toner on the photosensitive member 1 is removed by the cleaning unit 6. In the case of double-sided copying, the paper P on which the image is formed on the first side is sent to the circulation refeed unit 16 and reversed, and after the image is formed on the second side again by the image forming unit, the paper discharge unit 14 Is discharged out of the apparatus. In the case of reverse paper discharge, the paper P branched from the normal paper discharge path is switched back by the reverse paper discharge means 17 and turned upside down, and then discharged from the apparatus by the paper discharge means 14.

  The large-capacity paper feeding device LT connected to the image forming apparatus main body A includes a paper feeding device main body 30, a first air blowing means 40, a second air blowing means 50, a paper suction conveying means (paper feeding means) 60, and the like. A large amount of paper P is accommodated, and the paper P is fed to the image forming apparatus main body A one by one.

  The sheet feeder main body 30 includes a sheet feed tray 31, a leading end restricting member 32, a trailing end restricting member 33, and a guide rail 34. The paper feed trays 31 are configured in three stages, and each paper feed tray 31 is configured to be able to be pulled out from the large-capacity paper feeder LT by a guide rail 34. The maximum paper feed amount of the large capacity paper feeder LT is about 10300 sheets.

  FIG. 2 is a perspective view showing a main part of the large-capacity paper feeder LT of the present invention, FIG. 3 is a front sectional view of the large-capacity paper feeder LT, FIG. 4 is a plan view thereof, and FIG.

  In these drawings, the stacked sheets P are placed on the sheet feeding tray 31 and accommodated so as to be lifted and lowered by a mechanism (not shown). The side regulating member 41 is movable in the direction intersecting the feeding direction of the paper P, in this embodiment, in the paper width direction, and on both sides of the paper P in accordance with the paper width of the stacked paper P. Lightly press to regulate the positions of both sides of the paper P. The leading edge regulating member 32 regulates the position of the leading edge of the paper P in the feed direction. The rear end restricting member 33 is movable in the length direction of the paper P and restricts the position of the rear end in the feed direction of the paper P.

  As shown in FIG. 3, the rear end regulating member 33 is provided with a height detection sensor PS3 that detects the height of the paper P near the uppermost portion.

  In order to maintain the height of the stack of sheets stacked on the sheet feed tray 31 at an optimum height for blowing air and blowing the sheet P, the control means described later is configured to display the height shown in FIG. Based on the detection result of the height detection sensor PS3, a lift motor (not shown) is driven to perform control to raise the paper feed tray 31.

  As shown in FIG. 3, a sheet suction conveyance unit 60 is disposed in the vicinity of the leading end of the sheet P in the feeding direction. The sheet adsorbing and conveying means 60 has an adsorbing belt 63 that rotates by winding a large roller 61 and two small rollers 62 connected to a drive source. The suction belt 63 has a large number of small-diameter through holes. A suction unit 64 is disposed inside the suction belt 63 and transports the paper P while sucking it through the suction belt 63.

  When the suction belt 63 rotates while sucking the paper P, the uppermost paper P in the paper bundle accommodated on the paper feed tray 31 advances in the direction of the arrow X shown in the figure and is fed into the image forming apparatus main body A.

  A paper suction detection sensor PS1 disposed in the vicinity of the suction surface of the suction belt 63 detects that the uppermost surface of the paper P has been sucked.

  A feed sensor PS2 disposed in the vicinity of the suction belt 63 on the downstream side of the sheet feeding direction of the sheet feeding tray 31 detects the passage of the sheet P to be fed.

  In the vicinity of the suction belt 63 on the downstream side of the sheet feeding direction of the sheet feeding tray 31, the second blower unit 50 is fixed to the sheet feeding apparatus body 30. The 2nd ventilation means 50 is comprised by the electric fan etc. Note that the second air blowing unit 50 may be configured to be attached to the paper feeding device main body 30 so as to blow air to the front end portion of the sheet bundle through a duct.

  The electric fan 51 of the second air blowing means 50 is attached with the air blowing port 53 facing upward. The air blown upward is changed in direction by the guide plate 52, blown obliquely upward from the blower port 53, and blown to the vicinity of the suction belt 63 of the paper suction conveyance unit 60.

  The driving of the second blower 50 is controlled according to the type of the paper P. In other words, OHP film, trace paper, coated paper with a smooth surface, paper with perforations and lines, etc., and dust printed on offset printed paper. To ensure separation.

  As shown in FIGS. 2 and 5, first air blowing means 40 that blows air to the upper part of the paper P stacked in the paper feed tray 31 from the side perpendicular to the feeding direction of the paper P is provided on both sides of the paper feed tray 31. Placed on the surface. The first blowing means 40 has an electric fan 42 that blows air on the upper part of the paper P from the air blowing ports 44 on both sides orthogonal to the feeding direction of the paper P.

  The first air blowing means 40 is disposed on the side regulating member 41. The electric fan 42 is attached with the air outlet 44 facing upward. The air blown upward is changed in direction by 90 ° by the guide plate 42 and blown out from the blower opening 44 in the horizontal direction. The air blowing port 44 is opened near the upper end of the side regulating member 41. The width of the air outlet 44 is substantially the same as the width of the air outlet of the first air blowing means 40. A positional relationship is desirable such that the uppermost sheet P is located approximately at the center of the upper and lower ends of the air outlet 44. Since the first air blowing means 40 is attached to the side restriction member 41, even when the size of the paper P is changed, the first air blowing means 40 can be moved together by moving the side restriction member 41. Become. In addition, although the 1st ventilation means 40 and the ventilation port 44 are provided in the both sides of the paper P in this Example, you may make only one side.

  When the first air blowing means 40 is driven, air is discharged from the air blowing port 44 and air is blown onto several sheets at the top of the stacked paper P. Air is blown from one end of the paper P through the paper to the other end. As a result, the upper several sheets of the paper P are separated one by one. The sheet adsorbing and conveying means 60 takes out only the uppermost sheet P from the sheet P thus separated and reliably sends it to the downstream side.

  As shown in FIGS. 2 and 3, the air inlet of the first air blowing means 40 is shielded by the shielding means and can be opened and closed. That is, the shielding member (shutter) 45 of the shielding means is pivotally supported by the shaft 46 and opened and closed by the solenoid SOL. The control means controls the shielding member 45 so that it can be freely opened and closed, and performs switching control between execution and non-execution of the air blowing by the first air blowing means 40.

  FIG. 6 is a cross-sectional view showing a sheet suction conveyance process by the first blower 40 and the second blower 50.

  FIG. 6A shows a paper suction process. By the first blower V1 blown up by the first blower 40 (the white arrow in the figure), a small number of sheets P on the upper layer of the bundle of sheets stacked on the sheet feed tray 31 are lifted against the weight of the sheets. Then, it is adsorbed by the intake air V3 (open arrow in the figure) due to the negative pressure of the adsorption belt 63. The second blower V2 (the white arrow in the figure) blown up by the second blower 50 blows the vicinity of the front bottom of the suction belt 63.

  FIG. 6B shows a paper separation process. When the shielding member 45 shields the air inlet of the first air blowing means 40 and stops air blowing, the air blown only by the second air blowing means 50 passes between the uppermost sheet P1 and the lower sheet P2. The uppermost sheet P1 is adsorbed by the intake air V3 of the sheet adsorbing and conveying means 60, and separated from the sheet P of the sheet bundle excluding the uppermost sheet P1. The sheet P2 below the separated uppermost sheet P1 descends in the direction of the arrow due to the weight of the sheet P2, and is accommodated on the sheet P.

  Thus, by repeating the air blowing of the first air blowing means 40 and the second air blowing means 50, the floating of the several sheets P2 on the upper part of the sheet bundle spreads over almost the entire surface of the air blowing ports 44, 53, and the gaps between the respective sheets Are almost the same interval. And air passes through this gap. As a result, the separation of the paper P1 is improved and the paper P1 is easily sent out. As a result, the problem that the floating of the sheet P1 becomes too large and damages the sheet, or a plurality of sheets are floated together and cannot be separated is solved.

  After the separation of the paper P1 from the paper P2, the driving means (not shown) of the paper suction transport means 60 starts to drive, and the single paper P1 sucked by the suction belt 63 is transported.

  FIG. 7 is a block diagram showing a configuration of control of the paper feeding device, and FIG. 8 is a timing chart showing control of the paper feeding device.

  When the sheet adsorption detection sensor PS1 detects that the adsorption belt 63 of the sheet adsorption conveyance unit 60 has adsorbed the sheet P1, the control unit controls the shielding member 45 to be openable and closable, and the first blowing unit 40 performs air blowing. Switch non-implementation.

  The control unit detects that the sheet suction detection sensor PS1 (see FIG. 3) disposed in the vicinity of the suction belt 63 detects that the sheet P1 is sucked by the sheet suction transport unit 60, and then the sheet by the sheet suction transport unit 60. During the time until the delivery of P1 is started, the air inlet of the first air blowing means 40 is shielded by the shielding member 45 so that the air blowing is not performed.

  Further, the shielding member 45 is only when the paper suction detection sensor PS1 detects the suction of the paper P1 and when the feed sensor PS2 does not detect the paper P1, that is, before the paper P1 is sent out. Air is blown in the open state.

  The shielding time of the shielding member 45 may not be exactly the same as the above timing. However, if the shielding time is limited to the moment when the feeding of the paper P1 is started, the shielding time becomes extremely short, and the separation effect of the paper P1 is obtained. Absent. Further, when the sheet suction detection sensor PS1 detects the suction of the paper P1, if the shielding member 45 is always shielded, the paper P1 is not attracted to the suction belt 63 due to insufficient air lifting of the paper P1, and a paper feeding failure occurs. Sometimes. That is, a paper feed failure occurs even if the shielding time is too long or too short. As the best timing, as shown in FIG. 8, for the first sheet P1, when the sheet adsorption detection sensor PS1 is on and the feed sensor PS2 is off and in a state before the start of sheet feeding, the solenoid SOL is turned on and the shielding member 45 is closed. When the feed sensor PS2 is on, the shielding member 45 is opened.

  When the second sheet P2 is discharged, the sheet suction detection sensor PS1 is switched from on to off, and when the feed sensor PS2 is turned off and a predetermined time elapses, the sheet suction detection sensor PS1 is turned on again by the third sheet P. The solenoid SOL is turned on and the shielding member 45 is closed.

  As described above, by providing shielding means for lifting air and controlling the timing so that it can be freely opened and closed, even when a strong lifting force is generated on the bundle of paper by the lifting air, the separating air can separate the paper. Cuts off the lifted air flow and does not cause a collision between the lifted air flow and the separated air flow, so the paper can be separated efficiently and even with coated paper in a high humidity environment with high adhesion. Paper feeding that does not occur is possible.

  Although the large-capacity sheet feeding device LT connected to the image forming apparatus main body A has been described as the sheet feeding apparatus according to the present invention, the present invention can also be applied to the sheet feeding cassette 10 disposed in the image forming apparatus main body A.

30 Paper feeder main body 31 Paper feed tray 32 Front end restricting member 33 Rear end restricting member 40 First air blowing means 41 Side portion restricting member 42 Electric fan 43 Guide plate 44 Air outlet 45 Shielding member (shutter)
46 Shaft 50 Second air blowing means 51 Electric fan 52 Guide plate 53 Air blowing port 60 Paper adsorbing and conveying means (paper feeding means)
63 Suction belt 64 Suction means A Image forming apparatus main body LT Large-capacity paper feeding devices P, P1, P2 Paper PS1 Paper suction detection sensor PS2 Feed sensor SOL Solenoid V1 First air blow V2 Second air blow V3 Intake

Claims (8)

A paper feed tray for stacking a stack of paper sheets,
A sheet adsorbing and conveying means for adsorbing and conveying one sheet at a time from the uppermost sheet of the bundle of sheets stacked on the sheet feeding tray by air suction;
First air blowing means for blowing air from the side in the paper feeding direction toward the top of the paper stacked on the paper feed tray;
In a paper feeder having
The paper suction conveying means is
It is stretched by a large roller provided on the upstream side in the paper conveying direction and a plurality of small rollers located downstream of the large roller and smaller than the diameter of the large roller, and is rotated by driving the large roller. An adsorbing belt that
A suction means provided inside the suction belt for sucking the air;
Second air blowing means for blowing air in the paper conveyance direction from the downstream side in the paper conveyance direction toward the small roller;
A sheet feeding device comprising:   2. The sheet feeding device according to claim 1, wherein the second blowing unit blows air to a front end in a sheet conveyance direction of the sheet bundle by blowing air in the vicinity of the suction belt.   The sheet feeding device according to claim 2, wherein a vicinity of the suction belt is a vicinity of a front bottom portion of the suction belt. Control means for controlling the first air blowing means and the second air blowing means;
The said control means performs the ventilation by both the said 1st ventilation means and the said 2nd ventilation means, when the said sheet | seat is adsorb | sucked by the said sheet | seat adsorption | suction conveyance means. The sheet feeder according to item 1. Shielding means for shielding the blowing of air from the first air blowing means;
Paper suction detecting means for detecting that the paper is sucked by the paper suction conveying means,
The control means controls the shielding means when the paper adsorption detection means detects that the paper is adsorbed by the paper adsorption conveyance means, and shields the blowing of air from the first air blowing means, The paper feeding device according to claim 4, wherein the air blowing is performed only by the second air blowing unit. A feed sensor that is disposed in the vicinity of the suction belt on the downstream side in the paper transport direction and detects the passage of the paper fed by the paper suction transport means;
6. The supply according to claim 5, wherein when the feed sensor detects the passage of the paper, the control unit controls the shielding unit to restart the blowing of air from the first blower unit. Paper device.   The sheet feeding device according to claim 1, wherein the control unit controls driving of the second air blowing unit according to a type of the sheet. An image forming unit that forms an image on the image carrier;
A transfer unit for transferring an image on the image carrier to paper;
The paper feeding device according to any one of claims 1 to 7, wherein the paper is transported to the transfer unit.
An image forming apparatus comprising: