JP2007302453A - Paper feeding device and image forming device having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manual insertion paper feeding device not hindering miniaturization of an image forming device. <P>SOLUTION: The paper feeding device 20 in a storage position is pulled out to the side of the image forming device 100 by pulling a grip part 24 provided at the end of a drawer unit 20A, in a direction of an arrow mark A, and moved into a pull-out position where a sheet material P can be fed by manual insertion. Compared with a conventional structure of providing a paper feeding device for feeding the sheet material P by manual insertion, to be developable at the side face of the image forming device, the side face of the image forming device 100 does not project. The image forming device 100 can thereby be miniaturized. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a paper feeding device used in an image forming apparatus such as a copying machine and a printer, and an image forming apparatus including the paper feeding device.

  Some image forming apparatuses include a sheet feeding device that can manually supply a sheet material to an image forming unit (Patent Document 1).

This sheet feeding device is provided on the side surface of the image forming apparatus, and expands the tray around a hinge provided at a lower portion. Then, by placing the sheet material on the developed tray, the sheet material is supplied to the image forming unit by a manual conveyance roll provided separately from the conveyance roll that sends the sheet material of the paper feed cassette to the image forming unit. be able to.
JP-A-8-104449

  However, since the tray is provided with a guide member that guides the sheet material to the transport roll, the image forming apparatus becomes larger by the height of the guide member even if the sheet feeding device is folded to the side surface of the image forming device. This is an obstacle to miniaturization.

  In view of the above-described facts, the present invention has a problem in that a sheet feeding device that can manually supply a sheet material does not interfere with downsizing of an image forming apparatus.

  A sheet feeding device according to a first aspect of the present invention is a sheet feeding device capable of manually supplying a sheet material to an image forming apparatus, a drawer unit housed in the image forming apparatus so as to be capable of being pulled out, and the drawer unit And a guide member that guides the sheet material to a sheet feeding unit that conveys the sheet material to the image forming unit.

  According to the above configuration, the drawer unit of the sheet feeding device is housed in the image forming apparatus, and the sheet material can be sent to the sheet feeding unit via the guide member by being pulled out.

  As described above, since the sheet feeding device is stored in the image forming apparatus when not in use, the side surface of the image forming apparatus protrudes as compared with a conventional structure that can be unfolded on the side surface of the image forming apparatus. There is no. Thereby, the image forming apparatus can be reduced in size.

  The sheet feeder according to claim 2 of the present invention is characterized in that, in claim 1, the drawer unit is provided with a tray on which a sheet material is placed and guides the sheet material to the guide member. To do.

  According to the above configuration, the drawer unit is provided with the tray for guiding the placed sheet material to the guide member. For this reason, it is not necessary to support the sheet material by hand, and operability is good.

  According to a third aspect of the present invention, in the paper feeding device according to the second aspect, the drawer unit is inclined at the storage position of the drawer unit to store the tray in the drawer unit, and the drawer unit In the pulled-out position, an interlocking member that stands up and deploys the tray so that a sheet material can be placed thereon is provided.

  According to the above configuration, the interlocking member is stored in the drawer unit by tilting the tray at the storage position of the drawer unit. Furthermore, this interlocking member stands up at the drawing position of the drawing unit and unfolds the tray so that the sheet material can be placed thereon. For this reason, the trouble of developing the tray can be saved.

  A sheet feeding device according to a fourth aspect of the present invention is the paper feeding device according to any one of the first to third aspects, wherein the pull-out unit is provided with a separation roll that prevents double feeding of sheet material, and the pull-out unit is The first paper feed roll and the separation roll that feed the sheet material stacked in the paper feed cassette provided in the image forming apparatus to the image forming unit at a storage position stored in the image forming apparatus serve as a paper supply unit, The second paper feeding roll and the separation roll for feeding the manually fed sheet material to the image forming unit at the drawing position where the drawing unit is pulled out from the image forming apparatus serve as a paper feeding means.

  According to the above configuration, at the storage position of the drawer unit, the sheet feeding unit that sends the sheet material stacked in the sheet feed cassette to the image forming unit is configured by the separation roll and the first sheet feed roll provided in the drawer unit. Further, at the drawing position of the drawing unit, a sheet feeding means for feeding the manually fed sheet material to the image forming unit is configured by the separation roll and the second sheet feeding roll provided in the drawing unit.

  Thus, by sharing one separation roll, the number of parts and the cost can be reduced. In addition, using the same separation roll makes it easier to manage parameters such as spring pressure and roll diameter.

  According to a fifth aspect of the present invention, in the paper feeding device according to the fourth aspect, the drawer unit is configured to swing a bottom plate on which sheet materials are stacked and the guide member is provided, and an end portion of the bottom plate. A support means for movably supporting; an urging means for urging the bottom plate upward; an abutting portion formed on the bottom plate and pressed by a cam that rotates in conjunction with the second paper feed roll; It is characterized by having.

  According to the above configuration, the end portion of the bottom plate on which the sheet material is stacked is supported so as to be swingable by the support means, and further biased upward by the biasing means. In addition, since the abutting portion of the bottom plate is pressed each time the sheet material is fed by the cam that rotates in conjunction with the second paper feed roll, the sheet material can be set even if a plurality of sheet materials are set on the bottom plate. Are sent out one by one without being double fed.

  According to a sixth aspect of the present invention, in the paper feeding device according to the fourth or fifth aspect, the drawer unit is provided so as to be capable of being drawn out to the paper feeding cassette provided so as to be capable of being pulled out in the image forming apparatus. It is characterized by.

  According to the above configuration, since the sheet feeding device is provided in the sheet feeding cassette provided in the image forming apparatus, the dead space in the drawing direction of the sheet feeding cassette can be effectively used. Further, it is not necessary to secure the mounting space by increasing the height of the image forming apparatus.

  According to a seventh aspect of the present invention, in the paper feeding device according to the fifth or sixth aspect, the image forming apparatus is provided with a lock unit that pushes down and locks the bottom plate. The bottom plate is pushed down and locked by the locking means.

  According to the above configuration, the bottom plate is pushed down and locked by the locking means at the storage position. For this reason, it does not hinder the conveyance of the sheet material from the sheet feeding cassette.

  A paper feeding device according to an eighth aspect of the present invention includes the paper feeding device according to any one of the first to seventh aspects.

  According to the above configuration, since the image forming apparatus includes the paper feeding device according to any one of claims 1 to 7, the image forming apparatus can be downsized.

  According to the present invention, a sheet feeding device that can manually supply a sheet material can be configured not to hinder downsizing of the image forming apparatus.

  An embodiment of an image forming apparatus 100 provided with a sheet feeding device 20 according to the present invention will be described with reference to FIGS.

  As shown in FIG. 10, a paper feed cassette 21 that can be pulled out from the image forming apparatus 100 is disposed in the lower part of the housing 102 of the image forming apparatus 100. Sheet materials P supplied to 100 image forming units 111 are stacked. Further, in the paper feed cassette 21 is housed a paper feed device 20 that can manually supply a sheet material to be described later to the image forming unit 111 of the image forming apparatus 100.

  The sheet material P stacked on the sheet feeding cassette 21 is sequentially taken out by the pickup roll 104, and further includes a first sheet feeding roll 122 that is rotationally driven and a separation roll 22 provided in the sheet feeding apparatus 20. It is configured to be conveyed one by one by paper means.

  Further, a transport roll 106 is disposed at a predetermined position in the housing 102, and constitutes a transport path 108 for transporting the sheet material P. Further, guide members 128 are disposed on both sides of the conveyance path 108, and the sheet material P is guided along the conveyance path 108. In the following, the terms “upstream” and “downstream” simply mean upstream and downstream in the transport direction, respectively.

  In the middle of the conveyance path 108, the photosensitive drum 110 is disposed so as to be in contact with the sheet material P, and rotates while being in contact with the sheet material P. The surface of the photosensitive drum 110 is charged by a charging device (not shown), and then a laser beam corresponding to image information is irradiated by the exposure device 112 to form an electrostatic latent image. The electrostatic latent image is developed (visualized) by supplying toner from the developing device 114.

  The image forming unit 111 includes a photoconductive drum 110 and a transfer roll, and the photoconductive drum 110 holds the sheet material P between the transfer roll 130 and is in close contact with the sheet material P. As a result, the toner image on the photosensitive drum 110 is transferred to the sheet material P, and an image is formed on the sheet material P.

  A fixing device 116 is disposed on the downstream side of the photosensitive drum 110. The fixing device 116 includes two rolls, and includes a heating roll 116H having a heater therein and a pressure roll 116N. The sheet material P is sandwiched and rotated by these two rolls to heat the sheet material P and fix the toner of the sheet material P to the sheet material P.

  A discharge roll 118 is disposed on the downstream side of the fixing device 116, and the sheet material P on which the toner image is fixed is discharged to a discharge tray 126 provided in the housing 102 by the discharge roll 118. ing.

  A scanner 120 is provided above the housing 102 so that image information formed on a sheet or the like can be read.

  In the image forming apparatus 100 configured as described above, an image is formed as follows.

  First, a charger (not shown) to which a voltage is applied uniformly charges the surface of the photosensitive drum 110 with a predetermined potential.

  Subsequently, the exposure device 112 forms an electrostatic latent image on the charged photosensitive drum 110 based on the image data read by the scanner 120.

  That is, an electrostatic latent image corresponding to image data is formed on the photosensitive drum 110 by turning on and off the exposure device 112 based on video data supplied from a control device (not shown). Further, the electrostatic latent image is visualized as a toner image by toner supplied from the developing device 114.

  Therefore, the sheet material P taken out from the paper feed cassette 21 by the pickup roll 104 is sent out one by one along the guide 124 by the first paper feed roll 122 and the separation roll 22 to the transport path 108, and is sent to the transport roll 106. The toner image is transferred between the photosensitive drum 110 and the transfer roll 130 by being nipped and conveyed. The transferred toner image is fixed on the sheet material P by passing between a heating roll 116H and a pressure roll 116N provided in the fixing device 116, and is discharged to a discharge tray 126 by a discharge roll 118.

  Next, the paper feeder 20 will be described.

  As shown in FIG. 2, the paper feed cassette 21 is provided with a mounting table 23 integrally with the paper feed cassette 21 in the drawing direction. Further, guide walls 25 (see FIG. 1) are erected from both ends of the mounting table 23 in the width direction. Between the guide walls 25, a drawer unit 20A that is a housing of the paper feeding device 20 capable of manually feeding the sheet material P to the image forming unit 111 is housed so as to be drawable.

  As shown in FIG. 1, by pulling the grip portion 24 provided at the end of the drawer unit 20 </ b> A in the direction of arrow A, the sheet feeding device 20 in the storage position is pulled out to the side of the image forming apparatus 100. The sheet material P is moved to a drawing position where the sheet material P can be manually fed.

  In this way, since the paper feeding device 20 is provided in the paper feeding cassette 21, the dead space in the drawing direction of the paper feeding cassette 21 can be used effectively.

  Further, the side surface of the image forming apparatus 100 does not protrude as compared with a conventional structure in which a sheet feeding device that manually supplies the sheet material P is provided on the side surface of the image forming apparatus. Thereby, the image forming apparatus 100 can be reduced in size.

  Further, the drawer unit 20 </ b> A is provided with a bottom plate 42 that guides the sheet material P to the second paper feed roll 40 that conveys the sheet material P to the image forming unit 111. Further, behind the bottom plate 42, a tray 26 is provided that is developed to a position where the sheet material P can be placed by pulling out the sheet feeding device 20.

  Specifically, as shown in FIG. 4, the tray 26 is pivotally supported on the drawer unit 20 </ b> A by a rotation shaft 26 </ b> A provided at the front end (image forming apparatus 100 side). Further, a coil spring 28 is disposed below the tray 26, and the tray 26 is biased upward by the spring force of the coil spring 28. The image forming apparatus 100 is provided with a substantially triangular storage member 60 that pushes down the tray 26 at the storage position of the paper feeding device 20.

  With this configuration, in the storage position, the tray 26 is pressed downward by the storage member 60, tilted, and stored in the drawer unit 20A. 9, the tray 26 is released from the pressing force of the storage member 60, rotates about the rotation shaft 26A by the spring force of the coil spring 28, and moves upward. Here, the tip of a rod-like link 36 is rotatably attached to the rear end of the tray 26, and a pin 37 attached to the base end of the link 36 is provided on the side surface of the drawer unit 20A. It is movably inserted into the arcuate guide groove 20B. As a result, the tray 26 is rotated by the spring force of the coil spring 28, and at the same time, the pin 37 of the link 36 moves from one end to the other end in the guide groove 20B and stops. When the pin 37 stops, the link 36 stands up and the tray 26 is developed to a position where the sheet material P can be placed. In this state, the link 36 functions as a support bar that supports the tray 26.

  Therefore, it is not necessary to manually support the rear end of the sheet material P placed on the bottom plate 42. Further, when the drawer unit 20A is pulled out, the tray 26 is expanded by the spring force of the coil spring 28, so that the tray 26 is expanded. Save time and effort.

  Moreover, the cross-sectional shape of the tray 26 is a U-shape opened upward, and the first extension tray 30 is disposed on the upper side of the tray 26 along the U-shaped cross-section. Further, a second extension tray 32 is disposed on the upper side of the first extension tray 30 along the first extension tray 30.

  Cylindrical guide pins 32A are provided on both side surfaces of the second extension tray 32. The guide pins 32A are fitted into guide grooves 30C provided on the side surfaces of the first extension tray 30 to guide grooves 30C. It is possible to move inside.

  As shown in FIG. 8, the guide pin 32 </ b> A is guided by the guide groove 30 </ b> C by grasping the grip portion 32 </ b> D provided at the end of the second extension tray 32 and pulling out the second extension tray 32 from the first extension tray 30. The second extension tray 32 stops.

  Thereby, the placement surface on which the sheet material P is placed is widened at the rear end of the first extension tray 30, and a large size sheet material P can be placed. The second extension tray 32 stops at a position where it is pulled out by a fitting portion (not shown) provided on the first extension tray 30.

  Further, cylindrical guide pins 30 A are provided on both side surfaces of the first extension tray 30 disposed on the upper side of the tray 26, and the guide pins 30 A are guide grooves 26 C provided on the side surfaces of the tray 26. It is fitted and can move in the guide groove 30C.

  As shown in FIG. 7, by grasping the grip portion 32D provided in the second extension tray 32 and pulling out the first extension tray 30 from the tray 26, the guide pin 30A reaches the end of the guide groove 26C, The first extension tray 30 stops.

  As a result, the placement surface on which the sheet material P is placed is further expanded at the rear end of the tray 26, and a larger-size sheet material P can be placed. The first extension tray 30 stops at the position where the first extension tray 30 is pulled out by the frictional force generated between the first extension tray 30 and the tray 26.

  As shown in FIGS. 1 and 6, a guide plate 42 </ b> A that regulates the set position of the sheet material P in the width direction is provided on the sheet placement surface of the bottom plate 42. The bottom plate 42 urges the front end of the placed sheet material P toward the half-moon-shaped second paper feed roll 40 provided in the image forming apparatus 100 by the spring force of the coil spring 44.

  Specifically, the rear end of the bottom plate 42 is pivotally supported on the drawer unit 20A by the rotation shaft 42B, and the front end of the sheet material P placed on the bottom plate 42 is secondly supplied to the lower surface of the bottom plate 42. A coil spring 44 is provided as a biasing unit that biases the paper roll 40. In this way, the coil spring 44 pushes the bottom plate 42 upward from below the bottom plate 42, so that the leading edge of the sheet material P placed on the bottom plate 42 can be pressed against the second paper feed roll 40. The drawer unit 20A is provided with a stopper 47, and the bottom plate 42 pushed up by the coil spring 44 hits the stopper 47 and stops at a predetermined position.

  Further, eccentric cams 52 are provided at both ends of the rotation shaft 50 of the second paper feed roll 40, and the eccentric cam 52 rotates in conjunction with the second paper feed roll 40. As shown in FIG. 6, when the arcuate surface of the second paper supply roll 40 faces downward and the sheet material P is conveyed, the outer peripheral surface of the eccentric cam 52 moves to a position away from the bottom plate 42, and the bottom plate 42 presses the leading end of the sheet material P against the second paper feed roll 40 by the spring force of the coil spring 44.

  Further, the separation roll 22 pivotally supported by the drawer unit 20 </ b> A is disposed to face the second paper feed roll 40 with the sheet material P interposed therebetween. As described above, the separation roll 22 is disposed opposite to the first paper supply roll (see FIG. 2) at the storage position of the paper supply device 20, and the sheet material P stacked on the paper supply cassette 21 is transferred to the image forming unit. 111 (see FIG. 10), and the sheet material P placed on the bottom plate 42 and disposed opposite to the second paper feed roll 40 at the drawing position where the drawing unit 20A is drawn is placed on the image forming unit 111 (FIG. 10). (See)).

  Specifically, the separation roll 22 is pivotally supported by a box-shaped bracket 46 that is partially opened, and the rotating shaft 29 of the bracket 46 is pivotally supported by the rib 20C of the drawer unit 20A. A coil spring 48 is provided below the bracket 46. The coil spring 48 pushes up the bracket 46 so that the separation roll 22 pivotally supported by the bracket 46 is supplied to the second paper feed. It is biased toward the roll 40. The bracket 46 is provided with a stopper (not shown) so that the separation roll 22 stops at a predetermined position.

  The separation roll 22 has a built-in torque limiter 22A, and is given a predetermined (relatively large) torque in advance, and a predetermined nip pressure is maintained by the coil spring 48 from the second paper feed roll 40. Yes. For this reason, when receiving the rotational force of the second paper feed roll 40 through one sheet material, it rotates without moving relative to the sheet material P, but 2 to 3 sheet materials P are fed in a double feed. Since the frictional resistance between the two or three sheet materials P is small, only the uppermost sheet material P is conveyed to the image forming apparatus 100 (see FIG. 10) by the second paper feed roll 40, and the lower layer The sheet material P is prevented from being fed by the rotational resistance of the separation roll 22.

  Further, as shown in FIG. 5, when the arc surface of the second paper feed roll 40 faces upward and the sheet material P is not conveyed, the outer peripheral surface of the eccentric cam 52 is a contact portion formed on the bottom plate 42. 42C, the front end of the bottom plate 42 is pressed downward. Thus, even if a plurality of sheet materials P are set on the bottom plate 42, the bottom plate 42 is swung in accordance with the rotation of the second paper feed roll 40 by the eccentric cam 52, so that the sheet materials P one by one. Can be sent out.

  With this configuration, only one sheet of the uppermost layer of the plurality of sheet materials P set in the sheet feeding device 20 is fed by the sheet feeding means of the second sheet feeding roll 40 and the separation roll 22 as shown in FIG. The toner image on the photosensitive drum 110 is transferred to the sheet material P. Further, the toner is fixed to the sheet material P by the fixing device 116 disposed on the downstream side of the photosensitive drum 110. Further, the sheet material P is discharged to a discharge tray 126 provided in the housing 102 by a discharge roll 118 disposed on the downstream side of the fixing device 116.

  Further, as described above, the separation roll 22 for preventing the multi-feed of the sheet material P stored in the sheet feeding cassette 21 and the separation roll 22 for the sheet material P manually fed by the sheet feeding device 20 are shared. ing. Thereby, the number of parts and cost reduction are achieved. Also, by using the same separation roll 22, parameter management such as spring pressure and roll diameter becomes easy.

  Next, an operation for storing the paper feeding device 20 in the image forming apparatus 100 will be described.

  As shown in FIG. 8, first, the grip portion 32D of the second extension tray 32 is pushed to house the first extension tray 30 in the tray 26, and further, the grip portion 32D is pushed further as shown in FIG. The second extension tray 32 is stored in the first extension tray 30.

  Next, the paper feeding device 20 is housed in the image forming apparatus 100 by pushing the grip portion 24 of the drawer unit 20A in the direction B shown in FIG.

  Specifically, as shown in FIG. 4, at the same time as the drawer unit 20 </ b> A is pushed in, the tray 26 compresses the coil spring 28 along the outer surface 60 </ b> A of the storage member 60 provided in the image forming apparatus 100. It is tilted and stored in the drawer unit 20A.

  Further, as shown in FIG. 3, the bottom plate 42 is locked along the outer surface 62 </ b> A of the locking member 62 as a locking unit provided in the image forming apparatus 100 while the front end portion is pushed downward. . By pushing down the front end portion of the bottom plate 42, as shown in FIG. 2, it does not hinder the conveyance of the sheet material P stacked on the sheet feeding cassette 21.

FIG. 5 is a front view illustrating the sheet feeding device according to the embodiment of the present invention and illustrating a state of a drawing position in which the sheet material P can be manually fed. 1 is a front view illustrating a sheet feeding device according to an embodiment of the present invention and a state in which the sheet feeding device is housed in an image forming apparatus. FIG. 3 is a perspective view illustrating a state in which the bottom plate and the like of the sheet feeding device according to the embodiment of the present invention are housed in the image forming apparatus. FIG. 3 is a perspective view illustrating a tray of the sheet feeding device according to the embodiment of the present invention and a state in which the tray is housed in the image forming apparatus. The perspective view which showed the bottom plate etc. of the paper feeder which concerns on embodiment of this invention, and showed the state which the bottom plate was further urged | biased by the cam in the drawing position where the sheet material P can be manually fed It is. FIG. 5 is a perspective view showing a bottom plate and the like of the sheet feeding device according to the embodiment of the present invention, and a state in which the bottom plate is not biased by a cam at a drawing position where the sheet material P can be manually fed. . The perspective view which showed the tray etc. of the paper feeder which concerns on embodiment of this invention, and also showed the state which pulled out the 1st extension tray and the 2nd extension tray further in the drawer | drawing-out position where the sheet material P can be supplied manually. FIG. FIG. 5 is a perspective view showing a tray or the like of the sheet feeding device according to the embodiment of the present invention, and further showing a state in which the first extension tray is pulled out at a drawing position where the sheet material P can be manually fed. The perspective view which showed the tray etc. of the paper feeder which concerns on embodiment of this invention, and the state which accommodated the 1st extension tray and the 2nd extension tray further in the drawer | drawing-out position where the sheet material P can be supplied manually. FIG. 1 is a schematic configuration diagram of an image forming apparatus according to an embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 20 Paper feeder 20A Drawer unit 21 Paper cassette 22 Separation roll 26 Tray 28 Coil spring (interlocking member)
36 links (interlocking members)
40 Second paper feed roll 42 Bottom plate 42A Guide plate (guide member)
42B Rotating shaft (supporting means)
42C Contact part 44 Coil spring (biasing means)
50 Rotating shaft 52 Eccentric cam (cam)
62 Locking member (locking means)
100 Image forming apparatus 111 Image forming unit 122 First paper feed roll

Claims (8)

A sheet feeding device capable of manually supplying a sheet material to an image forming apparatus,
A drawer unit stored in the image forming apparatus so as to be capable of being pulled out;
A guide member that is provided in the drawer unit and guides the sheet material to a sheet feeding unit that conveys the sheet material to the image forming unit;
A sheet feeding device comprising:   The sheet feeding device according to claim 1, wherein the drawer unit is provided with a tray on which a sheet material is placed and guides the sheet material to the guide member.   The drawer unit is tilted at the storage position of the drawer unit to store the tray in the drawer unit, and is raised at the drawer position of the drawer unit so that the sheet material can be placed on the tray. The paper feeding device according to claim 2, further comprising an interlocking member. The drawer unit is provided with a separation roll for preventing the sheet material from being double-fed,
At the storage position where the drawing unit is stored in the image forming apparatus, the first paper supply roll and the separation roll that feed the sheet material stacked on the paper supply cassette provided in the image forming apparatus to the image forming unit are supplied. Paper means,
The second paper feeding roll and the separation roll for feeding the manually fed sheet material to the image forming unit at the drawing position where the drawing unit is pulled out from the image forming apparatus serve as a paper feeding unit. The sheet feeding device according to any one of 1 to 3.   The drawer unit includes a bottom plate on which sheet materials are stacked and the guide member is provided, support means for swingably supporting an end portion of the bottom plate, and biasing means for biasing the bottom plate upward. The sheet feeding device according to claim 4, further comprising: a contact portion formed on the bottom plate and pressed by a cam that rotates in conjunction with the second sheet feeding roll.   6. The sheet feeding device according to claim 4, wherein the drawer unit is provided so as to be able to be pulled out to the sheet feeding cassette provided so as to be capable of being pulled out from the image forming apparatus.   The image forming apparatus is provided with a lock unit that pushes down and locks the bottom plate, and the bottom plate is pushed down and locked by the lock unit in the storage position of the drawer unit. The paper feeding device according to claim 5 or 6.   An image forming apparatus comprising the paper feeding device according to claim 1.

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