Paper feeding device and image forming apparatus

Abstract

The presence or absence of paper is detected by a regulating member that controls the starting position of paper transport. [Solution] A paper feeder comprising a stopping part that abuts the leading edge of the supplied paper to regulate the paper transport start position, a restricting member which moves in the paper transport direction, and a detection unit which detects the presence or absence of paper based on the movement of the restricting member caused by the movement of the stopping part.

Description

Technical Field

[0001] The present invention relates to a paper feeding device and an image forming apparatus.

Background Art

[0002] Patent Document 1 discloses a recording medium loading device including a loading unit capable of loading a plurality of recording media, and a width regulating guide movable in the width direction for regulating and guiding the movement of the recording media loaded on the loading unit in the width direction. The width regulating guide includes a abutting portion movable independently in the width direction separately from the movement of the width regulating guide, and a first detecting means capable of detecting the movement amount of the width regulating guide. The abutting portion includes a second detecting means capable of detecting the movement amount of the abutting portion. Further, Patent Document 2 discloses a paper feeding device that sequentially feeds papers loaded on a paper loading plate to an image forming apparatus, wherein the same sensor detects whether the papers loaded on the paper loading plate are more than a predetermined reference amount and whether the loaded papers are present.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] The paper feeding device is provided with a regulating member for regulating the position of the leading end in the paper conveyance direction and a detecting member for detecting the presence or absence of paper. In this paper feeding device, the leading end of the set paper abuts against the regulating member and the detecting member, respectively.

[0005] However, if the paper size is small or the number of sheets is small, the leading edge of the paper may be pushed back by the regulating and detection members when the paper is loaded, which could lead to false detection of the presence or absence of paper or delays in paper transport.

[0006] The present invention aims to detect the presence or absence of paper by using a regulating member that controls the starting position of paper transport. [Means for solving the problem]

[0007] The invention described in claim 1 is a paper feeding device comprising a stopping portion that abuts the leading edge of the supplied paper to regulate the paper transport start position, the stopping portion moving in the paper transport direction, and a detection portion that detects the presence or absence of paper based on the movement of the regulating member caused by the movement of the stopping portion. The invention described in claim 2 is a paper feeding device according to claim 1, characterized in that the detection unit detects the presence or absence of paper by recognizing the movement of the regulating member with a non-contact sensor. The invention described in claim 3 is a paper feeding device according to claim 2, characterized in that the regulating member is supported by a rotating shaft at one end and has the abutment portion at the other end, swings about the rotating shaft when paper abuts against the abutment portion, and the non-contact sensor detects the presence or absence of paper by the change in the position of the swinging regulating member. The invention described in claim 4 is a paper feeding device according to claim 3, characterized in that the regulating member has a detection area for detection by the non-contact sensor on the side opposite to the rotation axis with respect to the abutment portion. The invention described in claim 5 is a paper feeding device according to claim 1, characterized in that the regulating member has a detection area that is subject to detection by the detection unit at a location outside the transport path through which the paper is transported. The invention described in claim 6 is a paper feeder according to claim 5, further comprising a paper support member that supports the supplied paper from below, wherein the detection area is located below the paper support member. The invention described in claim 7 is an image forming apparatus comprising the paper feeding device described in claims 1 to 6. [Effects of the Invention]

[0008] According to the invention of claim 1, the presence or absence of paper can be detected by a regulating member that regulates the starting position of paper transport. According to the invention of claim 2, compared to the case in which a contact sensor is used to detect the presence or absence of paper, damage to paper and other components can be suppressed. According to the invention of claim 3, the presence or absence of paper can be detected by the movement of the regulating member. According to the invention of claim 4, it is possible to capture changes in the position of the regulating member on a large scale. According to the invention of claim 5, the impact on paper transport can be reduced when detecting the presence or absence of paper. According to the invention of claim 6, the presence or absence of paper can be detected in an area separated from the area where paper is present via the tray. According to the invention of claim 7, an image forming apparatus can be provided that detects the presence or absence of paper by a regulating member that regulates the starting position of paper transport. [Brief explanation of the drawing]

[0009] [Figure 1] This figure shows the image forming apparatus according to this embodiment. [Figure 2] This is a perspective view of the manual paper feed device as seen from the direction of arrow II in Figure 1. [Figure 3] This is an explanatory diagram illustrating the manual paper feed device when no paper is supplied to the tray. [Figure 4] This is an explanatory diagram illustrating a manual paper feed device with paper supplied to the tray. [Figure 5] This is an explanatory diagram illustrating a modified example of the detection unit. [Modes for carrying out the invention]

[0010] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. <Configuration of Image Forming Apparatus> FIG. 1 is a diagram showing an image forming apparatus 1 according to the present embodiment. The image forming apparatus 1 is an example of a paper feeding apparatus. The image forming apparatus 1 includes an image forming unit 10 that forms a toner image on a sheet P, and a fixing unit 20 that heats and presses the toner image formed on the sheet P by the image forming unit 10. The image forming apparatus 1 also includes a paper feed tray 31 that supplies the sheet P to the image forming unit 10. Further, the image forming apparatus 1 includes a manual paper feed device 50 that supplies a specific sheet P such as an envelope or thin paper to the image forming unit 10.

[0011] The image forming unit 10 includes an image carrier 11, a charging device 12, an exposure device 13, a developing device 14, a transfer device 15, and a cleaning device 16.

[0012] The image carrier 11 has a photosensitive layer on its outer peripheral surface and rotates in the direction of the arrow shown in FIG. 1. The charging device 12 charges the rotating image carrier 11 to a predetermined potential. The exposure device 13 selectively exposes the image carrier 11 charged by the charging device 12 to form an electrostatic latent image on the image carrier 11.

[0013] The developing device 14 develops the electrostatic latent image formed on the image carrier 11 with toner to form a toner image on the image carrier 11. The transfer device 15 transfers the toner image on the image carrier 11 to the sheet P by forming an electric field between the transfer device 15 and the image carrier 11. The cleaning device 16 removes toner and the like remaining on the image carrier 11 after transfer. Hereinafter, in this specification, the position where the toner image on the image carrier 11 is transferred to the sheet P is referred to as a transfer portion Tp.

[0014] The paper feed tray 31 sets a stack of paper of a standard size such as A4 or B4 inside the housing 1A of the image forming apparatus 1. On the other hand, the manual paper feed device 50 is used when the user desires to print on paper of a size not set in the paper feed tray 31, envelopes, thin paper, film paper, etc. The manual paper feed device 50 is attached to the housing 1A so as to be rotatable and openable / closable. Details of the manual paper feed device 50 will be described later.

[0015] The paper feed tray 31 includes a feed roll 32 and a separating mechanism 33. The feed roll 32 contacts the uppermost sheet P among the stacked multiple sheets of paper P and feeds this uppermost sheet P to the separating mechanism 33. The separating mechanism 33 is composed of a feed roll arranged to be rotatable and a retard roll whose rotation is restricted, and separates the paper P fed by the feed roll 32 sheet by sheet. Then, the separating mechanism 33 feeds the separated paper P to the downstream side.

[0016] The paper P fed out from the separating mechanism 33 is conveyed to the image forming unit 10 by conveyance rolls provided in the paper path. A registration roll is attached to the paper path. The registration roll supplies the paper P conveyed from the paper feed tray 31 or the paper P fed out by the manual paper feed device 50 to the transfer unit Tp. The registration roll stops when the paper P is conveyed from the upstream side, temporarily stopping the conveyance of the paper P. Then, the registration roll starts rotating at a predetermined timing and supplies the paper P to the transfer unit Tp.

[0017] The image forming apparatus 1 is further provided with a control unit 500 that controls various operations of the image forming apparatus 1. The control unit 500 in this embodiment receives the detection result of the presence or absence of the paper P from a detection sensor 55 described later and controls the image forming operation based on the detection result. For example, when the image forming apparatus 1 detects the absence of the paper P, it performs control to中止 the image forming operation.

[0018] <Configuration of the manual paper feed device> Next, the manual paper feed device 50 in this embodiment will be described using Figures 2 to 4. Figure 2 is a perspective view of the manual feed device 50 as seen from the direction of arrow II in Figure 1. Figure 3 is an explanatory diagram illustrating the manual feed device 50 when no paper P is supplied to the tray 51. Figure 4 is an explanatory diagram illustrating the manual feed device 50 when paper P is supplied to the tray 51. Figures 3 and 4 show the manual feed device 50 as seen from the front of the image forming apparatus 1 (the front side of the paper in Figure 1). The manual feed device 50 is an example of a paper feed device when it is traded as a replacement part or a separately attached part, etc.

[0019] As shown in Figure 2, the manual feed device 50 is provided with a tray 51 on which a sheet of paper P or a bundle of paper P is placed, and which serves as a transport path for the paper P to be conveyed. The tray 51 is an example of a paper support member. The manual feed device 50 is also provided with a feed roll 52 that sends the paper P supplied to the tray 51 to a sorting section 56 (see Figure 3). The sorting section 56 is also provided that sorts the paper P sent out by the feed roll 52 one sheet at a time and sends it downstream. The sorting section 56 consists of a feed roll 53 (see Figure 3) that is rotatably arranged and a retard roll 54 (see Figure 3) whose rotation is restricted.

[0020] Furthermore, the manual feed device 50 is provided with a regulating member 60 that is placed on the transport path of the paper P and regulates the position of the leading edge of the paper P in the transport direction (hereinafter also referred to as the "transport start position"). The manual feed device 50 is also provided with a stopper mechanism 100 that restricts the movement of the regulating member 60 to a certain range (see Figure 3). Furthermore, a detection sensor 55 is provided that detects the presence or absence of paper P based on the movement of the regulating member 60. The detection sensor 55 is composed of, for example, a non-contact sensor such as an optical sensor. As an optical sensor, for example, a light-shielding sensor can be used. The top of the manual feed device 50 is covered by a cover member. Note that the paper handling unit 56 may be configured to be provided on the housing 1A side of the image forming apparatus 1.

[0021] The tray 51 has the function of holding the paper P and also serving as a transport path for paper transport, and is formed in a plate shape. The tray 51 is provided with a support surface (hereinafter referred to as the "paper support surface 51C") that supports the paper P from below. The paper support surface 51C of the tray 51 has a through hole 51D that allows the tray 51 to pass through from above and below.

[0022] The manual feed device 50 is provided with a rotating shaft 75 that extends in a direction perpendicular to the paper transport direction of the paper P and parallel to the paper support surface 51C of the tray 51. This rotating shaft 75 is installed so as to be able to move up and down relative to the paper support surface 51C of the tray 51. This rotating shaft 75 is the rotating shaft of the feed roll 52 and also supports the regulating member 60. By moving up and down, the rotating shaft 75 positions the feed roll 52 upward when waiting before transporting the paper P, and positions the feed roll 52 downward when transporting the paper P.

[0023] As shown in Figure 3, the regulating member 60 has a support portion 61 and an arm 62 extending from the support portion 61. The regulating member 60 also has a stopper surface 63 that functions as a stopper against which the paper P abuts, and a detection area 64 which is an area detected by the detection sensor 55.

[0024] The support portion 61 supports the restricting member 60 so that it can rotate around the rotation axis 75. As a result, the support portion 61 swings about the rotation axis 75. A protrusion 66 is formed on the support portion 61. This protrusion 66 is used to restrict the movement of the restricting member 60 to a certain range. More specifically, it defines the movement of the restricting member 60 between the state in which no paper P is placed on the tray 51 and the state in which paper P is placed on the tray 51 and the paper P is pushed to the transport start position.

[0025] The arm 62 facilitates the oscillation of the regulating member 60, which moves under its own weight. The abutment surface 63 is formed on the arm 62, and the shape of the arm 62 plays a role in determining the abutment position of the paper P. In this embodiment, the arm 62 is formed to extend in an L-shape from the support portion 61, and the abutment surface 63 is formed on the inside of the L-shape. This configuration allows the abutment surface 63 to be in a shape favorable for transporting the paper P, such as being approximately perpendicular to the paper support surface 51C when the leading edge of the paper P is abutted against it.

[0026] Furthermore, the abutment surface 63 is oriented perpendicular to the paper transport direction of the paper P and has a constant thickness relative to the width direction of the paper P. This ensures that the paper P is supported by a surface, resulting in stable abutment. The abutment surface 63 is also formed to have a constant height relative to the paper support surface 51C. This allows for the abutment position of a predetermined number of stacks of paper P. In other words, even when multiple sheets of paper P are supplied to the tray 51, the top and bottom sheets of paper P are supported at approximately the same angle to the abutment surface 63, thereby reducing misalignment of the paper P during setup.

[0027] The detection area 64 is the area to be detected by the detection sensor 55, and in this embodiment, it is provided on the extension of the arm 62. In this embodiment, the restricting member 60 has a stopper surface 63 formed above the through hole 51D formed on the tray 51, and the detection area 64 is formed below the through hole 51D. In other words, the stopper surface 63 of the restricting member 60 is formed in the transport path, and the detection area 64 is formed on the opposite side of the tray 51 from the stopper surface 63.

[0028] It can also be said that the regulating member 60 has a detection area 64 on the opposite side of the rotation axis 75 from the arm 62. In this embodiment, it can also be said that the regulating member 60 has a detection area 64 at a location outside the transport path of the paper P.

[0029] As shown in Figure 3, the manual feed device 50 in this embodiment is provided with a stopper mechanism 100 that restricts the movement of the restricting member 60 to a certain range, including the area where the support portion 61 above the restricting member 60 is formed. The stopper mechanism 100 has a protrusion 66 formed on the support portion 61, and a first stopper wall 101 and a second stopper wall 102 that contact this protrusion 66. The second stopper wall 102 retracts to a position where it does not obstruct the movement of the restricting member 60 when the paper P is fed out by the feed roll 52.

[0030] The protrusion 66 has a first surface 66a that contacts the first abutment wall 101 and a second surface 66b that contacts the second abutment wall 102. The position of the regulating member 60 before the paper P is set is determined by the first surface 66a of the protrusion 66 contacting the first abutment wall 101. The position of the regulating member 60 after the paper P is set is determined by the second surface 66b of the protrusion 66 contacting the second abutment wall 102.

[0031] <Movement of regulatory components> Next, the movement of the regulating member 60 will be explained using Figures 3 and 4. As shown in Figure 3, in the pre-paper-loading state where no paper P is supplied, the clockwise R1 movement of the regulating member 60 due to its own weight, as shown in Figure 3, is restricted by the first surface 66a of the protrusion 66 contacting the first abutment wall 101. As a result, the abutment surface 63 of the regulating member 60 is set to the pre-paper-loading position, which allows the user to load the paper P. Furthermore, if the detection sensor 55 is composed of an optical sensor including a light-emitting part and a light-receiving part, at the position of the regulating member 60 in the pre-paper-loading state, the light from the light-emitting part is blocked, for example, by the detection area 64. If the light from the light-emitting part is blocked by the detection area 64, the detection sensor 55 detects that there is no paper P.

[0032] As shown in Figure 4, in the paper-set state with paper P supplied, the regulating member 60 rotates in the counterclockwise direction R2 from the state shown in Figure 3 as the inserted paper P abuts against the abutment surface 63, pushing the abutment surface 63. At this time, the second surface 66b of the protrusion 66 of the regulating member 60 hits the second abutment wall 102, and the rotational movement of the regulating member 60 stops. As a result, the abutment surface 63 of the regulating member 60 is set to the paper-transport start position. Furthermore, if the detection sensor 55 is composed of an optical sensor including a light-emitting part and a light-receiving part, at the position of the regulating member 60 in the paper-set state, the light from the light-emitting part is not blocked by the detection area 64. When light from the light-emitting part is not blocked by the detection area 64, the detection sensor 55 detects the presence of paper P.

[0033] Subsequently, when an instruction is given to start transporting the paper P supplied to the tray 51, the rotating shaft 75 moves downward. As the rotating shaft 75 moves downward, the feed roll 52 comes into contact with the paper P. Also, as the rotating shaft 75 moves downward, the support portion 61 of the regulating member 60 also moves downward. As the support portion 61 moves downward, the second surface 66b of the protrusion 66 is released from contact with the second abutment wall 102, allowing the regulating member 60 to rotate counterclockwise.

[0034] Then, the paper P is transported by the rotation of the feed roll 52. At this time, the regulating member 60 is allowed to rotate counterclockwise, and the paper P moves by pushing against the abutting surface 63 of the regulating member 60, and moves to the sorting section 56 consisting of the feed roll 53 and the retard roll 54. After that, the paper P, sorted one sheet at a time by the feed roll 53 and the retard roll 54, moves downstream.

[0035] In the detection by the detection sensor 55 described above, the light from the light-emitting part is blocked by the detection area 64 when no paper P is supplied, and the blocking is released by the detection area 64 when paper P is supplied. However, the detection by the detection sensor 55 may be reversed. That is, the light from the light-emitting part is not blocked by the detection area 64 when no paper P is supplied, and the blocking is released by the detection area 64 when paper P is supplied. In this embodiment, by providing the detection area 64 on the regulating member 60, the presence or absence of paper P can be detected by the regulating member 60.

[0036] <Modified image of the detection unit> Next, we will explain modified examples of the structures shown in Figures 3 and 4 using Figure 5. In the examples shown in Figures 3 and 4, the presence or absence of paper P was detected by detecting a detection area 64 formed on the extension of the arm 62 of the restricting member 60 using an optical sensor. In contrast, in the modified example, the presence or absence of paper P is detected by detecting another position of the restricting member 60, without providing a detection area 64 at the position where the arm 62 of the restricting member 60 is extended. Note that the same symbols are used for configurations similar to those described above, and a detailed explanation is omitted here.

[0037] Figure 5 is an explanatory diagram illustrating a modified example of the detection unit. In this modified example, the first surface 66a of the protrusion 66 functions as the detection area 80 in the modified example. In this modified example, a detection sensor 105 for detecting the detection area 80 is provided on the first abutment wall 101 of the stopper mechanism 100. As the detection sensor 105 in the modified example, for example, a sensor that detects contact can be used.

[0038] As shown in Figure 5, in the pre-paper-setting state where no paper P is supplied, the clockwise R1 movement of the regulating member 60 due to its own weight is restricted by the first surface 66a of the protrusion 66 contacting the first abutment wall 101. The abutment surface 63 of the regulating member 60 is set to the pre-paper-setting position where the user can set the paper P. At this time, the first surface 66a of the protrusion 66 is in contact with the first abutment wall 101. That is, the detection area 80 is in contact with the detection sensor 105. In this modified example, when the detection area 80 is in contact with the detection sensor 105, the detection sensor 105 detects that there is no paper P.

[0039] When paper P is supplied, the regulating member 60 rotates counterclockwise (opposite to the clockwise direction R1) as the paper P abuts against the abutment surface 63, which is pushed. Then, the second surface 66b of the protrusion 66 of the regulating member 60 hits the second abutment wall 102, and the rotation of the regulating member 60 stops. As a result, the abutment surface 63 of the regulating member 60 is set to the paper P transport start position. At this time, the first surface 66a of the protrusion 66 is not in contact with the first abutment wall 101. That is, the detection area 80 is not in contact with the detection sensor 105. In this modified example, when the detection area 80 is not in contact with the detection sensor 105, the detection sensor 105 detects the presence of paper P.

[0040] In the modified version, the first surface 66a of the protrusion 66 is used as the detection area 80, and the presence or absence of paper P is detected by whether or not the first surface 66a is in contact with the detection sensor 105. Alternatively, the opposite surface of the protrusion 66 may be used as the detection area 80. That is, the second surface 66b of the protrusion 66 is used as the detection area 80. In this case, the detection sensor 105 is provided on the second abutment wall 102. The presence or absence of paper P is then detected by whether or not the second surface 66b is in contact with the detection sensor 105.

[0041] In the modified example shown in Figure 5, a contact sensor is used as the detection sensor 105, but the system is not limited to this. An optical sensor including a light-emitting part and a light-receiving part may also be used as the detection sensor 105. In this case, the detection sensor 105 is installed, for example, above the support part 61, in a location where it can detect changes in the position of the protrusion 66 formed on the support part 61. The detection sensor 105 then detects the presence or absence of the paper P by determining whether or not the light from the light-emitting part is blocked by the protrusion 66. At this time, the protrusion 66 can be said to be functioning as a detection area 80.

[0042] In this modified example, the regulating member 60 also has a detection area 80, so the regulating member 60 can detect the presence or absence of paper P. Furthermore, in this modified example, it is not necessary to extend the arm 62 all the way down to the bottom of the tray 51.

[0043] Although embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the above embodiments. Embodiments of the present invention are not limited to manual paper feed devices, but can also be applied to, for example, an automatic document feeder that automatically feeds supplied paper one sheet at a time to the image reading unit. Furthermore, various modifications and substitutions of configurations that do not depart from the technical concept of the present invention are included in the present invention.

[0044] <Note> (((1))) A paper feeder comprising a stopper that abuts the leading edge of the supplied paper to regulate the paper transport start position, the stopper moving in the paper transport direction, and a detection unit that detects the presence or absence of paper based on the movement of the regulating member caused by the movement of the stopper. (((2))) The paper feeding device according to (((1))), characterized in that the detection unit detects the presence or absence of paper by recognizing the movement of the regulating member with a non-contact sensor. (((3))) The paper feeding device according to (((2))), characterized in that the restricting member is supported by a rotating shaft at one end and has the abutment portion at the other end, swings about the rotating shaft when paper abuts against the abutment portion, and the non-contact sensor detects the presence or absence of paper by the change in the position of the swinging restricting member. (((4))) The paper feeding device according to (((3))), characterized in that the regulating member has a detection area on the opposite side of the rotation axis from the abutment portion for detection by the non-contact sensor. (((5))) The paper feeding device according to any one of (((1))) to (((4))), characterized in that the restricting member has a detection area that is subject to detection by the detection unit at a location outside the transport path through which the paper is transported. (((6))) The paper feeding device according to (((5))), further comprising a paper support member that supports the supplied paper from below, wherein the detection area is located below the paper support member. (((7))) An image forming apparatus equipped with a paper feeding device as described in any one of items (((1))) to (((6))).

[0045] According to the invention of (((1))), the presence or absence of paper can be detected by a regulating member that regulates the starting position of paper transport. According to the invention of (((2))), compared to the case in which a contact sensor is used to detect the presence or absence of paper, damage to paper and other materials can be suppressed. According to the invention of (((3))), a single component can be provided with a function for determining the starting position for paper transport and a region for detecting the presence or absence of paper. According to the invention of (((4))), it is possible to make it easier to detect changes in the position of the regulating member and to improve the accuracy of detecting the presence or absence of paper. According to the invention of (((5))), it is possible to prevent obstruction of paper transport. According to the invention of (((6))), the device can be miniaturized by saving space. According to the invention of (((7))), the presence or absence of paper can be detected by a regulating member that regulates the starting position of paper transport. [Explanation of Symbols]

[0046] 1…Image forming apparatus, 10…Image forming unit, 11…Image holder, 12…Charging device, 13…Exposure device, 14…Developing device, 15…Transfer device, 16…Cleaning device, 20…Fixing unit, 31…Paper feed tray, 50…Manual feed device, 51…Tray, 52…Feed roll, 53…Feed roll, 54…Retard roll, 55…Detection sensor, 56…Screwing unit, 60…Regulating member, 61…Support unit, 62…Arm, 63…Butt surface, 64…Detection area, 75…Rotation axis, 100…Stopping mechanism

Claims

1. A restricting member having a stopper portion that abuts the leading edge of the supplied paper to regulate the paper transport start position, and the stopper portion moves in the paper transport direction, A detection unit that detects the presence or absence of paper by the movement of the regulating member caused by the movement of the abutment portion, A paper feeder equipped with a paper feeder.

2. The paper feeding device according to claim 1, characterized in that the detection unit detects the presence or absence of paper by recognizing the movement of the regulating member with a non-contact sensor.

3. The regulating member is supported by a rotating shaft at one end and has the abutment portion at the other end, and when the paper comes into contact with the abutment portion, it swings about the rotating shaft. The paper feeding device according to claim 2, characterized in that the non-contact sensor detects the presence or absence of paper by a change in the position of the oscillating regulating member.

4. The paper feeding device according to claim 3, characterized in that the regulating member has a detection area for detection by the non-contact sensor on the side opposite to the rotation axis with respect to the abutment portion.

5. The paper feeding device according to claim 1, characterized in that the restricting member has a detection area that is subject to detection by the detection unit at a location outside the transport path through which the paper is transported.

6. The system further includes a paper support member that supports the supplied paper from below, The paper feeding device according to claim 5, characterized in that the detection area is located below the paper support member.

7. An image forming apparatus comprising the paper feeding device according to claims 1 to 6.

Images