JP3566572B2 - Paper feeder and image forming apparatus having the same - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sheet feeding device and an image forming apparatus including the same, and more particularly, to a structure of a door member that opens and closes a sheet storage opening provided in a sheet storage unit of the sheet feeding device.
[0002]
[Prior art]
2. Description of the Related Art Some conventional image forming apparatuses include a paper feeder that stores recording paper (sheets) and feeds the recording paper to an image forming apparatus main body. FIG. 9 is a perspective view of such a conventional sheet feeding apparatus and an image forming apparatus provided with the same. In FIG. 9, reference numeral 400 denotes an image forming apparatus having an image forming unit therein, and 400A denotes an image forming apparatus main body. Reference numeral 300 denotes a large-capacity sheet feeding deck which is a sheet feeding device detachably attached to the image forming apparatus main body 400A.
[0003]
The sheet feeding deck 300 is of a side loading type in which recording sheets S are stored in a (sheet) storage section 108 provided therein in a horizontal direction.
[0004]
By the way, a pickup roller (not shown) for feeding out the recording paper S loaded on the recording material loading support part 109 is installed inside the storage part 108 so as to be able to move up and down and rotate freely. After the separated recording paper S is separated one by one by a pair of paper feed rollers (not shown), the recording paper S is conveyed to the image forming apparatus main body 400A, and thereafter, after the image is transferred and fixed inside the image forming apparatus main body. The paper is discharged to a paper discharge unit.
[0005]
By the way, when a plurality of recording papers S are conveyed, the paper supply roller pair is in contact with the paper supply roller for transporting the recording paper S and presses against the paper supply roller and rotates in the opposite direction to the paper supply roller. A retard roller that functions to return the extra recording paper S to the recording paper stacking support 109 is provided.
[0006]
Here, a torque limiter is interposed between the retard roller and the retard shaft as a drive input side. When a torque equal to or more than a predetermined torque is transmitted to the retard roller by the torque limiter, the retard roller is fed. It is designed to rotate with the roller. The contact pressure and the torque value are adjusted so that the retard roller rotates with the paper feeding roller when the recording paper is not held between the paper feeding roller pair or when only one recording paper is conveyed. ing.
[0007]
On the other hand, in the figure, reference numeral 110 denotes a door for opening and closing the storage unit 109, and the door 110 is opened and closed in a horizontal direction about a rotation axis (not shown). A protrusion 103 is provided at the tip of the door 110, and the open / close detection unit 101 provided on the main body side of the sheet feeding deck 300 detects the protrusion 103 to close the door 110. Is detected. The sheet feeding deck 300 is configured to start a sheet feeding operation after the opening / closing detection unit 101 detects that the door 110 has been closed.
[0008]
Here, the opening and closing of the door 110 can be roughly divided into the following two cases. One is a case where the recording paper S is stored in the storage unit 108, and the other is a case where the recording paper S that has caused a recording paper jam (jam) in the storage unit is removed.
[0009]
By the way, in the conventional paper feed deck 300, in order to easily perform the operation of storing the recording paper S or removing the jammed recording paper S, the pressure contact between the paper feed rollers is released or the pickup roller is moved. There is a demand for a configuration for retreating upward, and for this reason, for example, there has been a configuration in which the pressure contact between the paper feed rollers is released and the pickup roller retreats upward in accordance with the movement of the door 110, for example.
[0010]
On the other hand, the door itself may be opened vertically to open the side and top surfaces of the sheet feeding deck 300 so as to facilitate the recording paper storage operation. Similarly to the above, the configuration is such that the pressure contact between the paper feed rollers is released and the pickup roller is retracted upward in accordance with the movement of the door.
[0011]
Here, in the case of such a door that is opened and closed in the vertical direction, unlike a horizontally-opening door, the rotating moment about the center of the rotation axis due to the weight of the door increases, so that a large force is required when the door is opened. Was needed. For this reason, a biasing means such as a torsion coil spring is provided on the rotating shaft to urge the door upward, so that the door can be easily opened and the door is held in an open state. Had to be able to. In this configuration, since the (larger) urging force is generated in the opening direction even when the door is closed, the door is kept closed by another latch, magnet, or the like.
[0012]
[Problems to be solved by the invention]
However, in such a conventional paper feed deck, a mechanism for detecting opening and closing of the door and a mechanism for releasing the pressure contact between the paper feed rollers and retreating the pickup roller upward are separately provided, so that the structure is different. Was complicated and led to an increase in cost.
[0013]
In particular, in the case of a door that opens upward, if the door is held at a desired opening angle, the spring force of the torsion coil spring becomes large. When such a torsion coil spring having a large spring force is used, the urging force in the opening direction in the closed state also becomes large, and a strong mechanism is required as a mechanism for holding the door in the closed state. .
[0014]
However, if the holding mechanism is strengthened in this way, when opening the door, the door released from the holding mechanism will open with too much momentum, or to what angle by the user's operation because there is no latch feeling It was difficult to judge whether it was good or too open, and in the worst case, the hinge part might be damaged.
[0015]
Therefore, the present invention has been made in view of such a situation, and when a door (member) is opened, it is possible to hold the door at a desired opening angle, to detect opening and closing of the door, It is an object of the present invention to provide a sheet feeding device having a simple structure for releasing the pressure contact between (separating sheet feeding means) and retracting a pickup roller (conveying means), and an image forming apparatus having the same.
[0016]
[Means for Solving the Problems]
The present invention includes a sheet storage unit provided inside the main body, and a door member that opens and closes a sheet storage opening provided in the sheet storage unit, and a sheet feeding operation when the door member is closed. When the door member is opened, a moving member pressed and moved by a pressing portion provided on the door member, and opening of the door member is detected by movement of the moving member. Configured detecting means, and engaging means for, when the door member is opened at a predetermined angle, engaging with a pressing portion provided on the door member and holding the door member opened at a predetermined angle. Wherein the moving means is urged by an urging means in a direction opposite to the moving direction, and maintains the engagement state with the engaging means by the urging force of the urging means. .
[0017]
The present invention further includes a sheet storage unit provided inside the main body, and a door member that opens and closes a sheet storage opening provided in the sheet storage unit, and feeds paper when the door member is closed. When the door member is opened, a moving member that is pressed by a pressing portion provided on the door member and moves, and the opening of the door member is detected by the movement of the moving member. And an engaging means for engaging with a pressing portion provided on the door member to hold the door member opened at a predetermined angle when the door member is opened at a predetermined angle. Wherein the engaging means is a recess or a notch provided in a contact portion of the moving member with the door member.
[0018]
Further, the present invention is configured such that a conveying unit that is provided so as to be able to contact and separate the sheet stored in the sheet storage unit and sends out the sheet while contacting the sheet, and a sheet that is sent from the conveying unit is separated one by one. A pair of pressurized separated sheet feeding means for feeding the sheet, a separating mechanism for separating the conveying means, which is in contact with the sheet, from the sheet when the door member is opened, and when the door member is opened. A pressure releasing mechanism for separating the pair of separated paper feeding means and pressing the pair of separated paper feeding means when the door member is closed; and a separating mechanism and a pressure releasing mechanism in conjunction with movement of the moving member. And an actuating member for actuating.
[0020]
Further, in the invention, it is preferable that the sheet storage portion stores the sheet from a substantially horizontal direction, and the sheet storage opening is formed over a side surface and an upper surface of the main body.
[0023]
Further, according to the present invention, in an image forming apparatus including an image forming unit and a sheet feeding device that feeds a sheet to the image forming unit, the sheet feeding device is detachably mounted on an image forming apparatus main body, It is characterized by any of the above.
[0024]
Further, as in the present invention, when the door member is opened, the detecting means detects the opening of the door member by the movement of the moving member pressed by the pressing portion provided on the door member, and sets the door member at a predetermined angle. When the door is opened, the pressing part provided on the door member is engaged with the engagement means provided on the contact part of the moving member with the door member, and the door member is held in an opened state at a predetermined angle.
[0025]
Further, when the door member is opened, the conveying member provided to be able to contact and separate from the sheet stored in the sheet storing portion is conveyed by an operating member interlocking with the movement of the moving member when the conveying member is in contact with the sheet. A separation mechanism that separates the unit from the sheet and a pressure release mechanism that separates a pair of press-contacted separated sheet feeding units that separate and feed the sheets sent from the conveyance unit one by one are operated.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0027]
FIG. 1 is a perspective view of an image forming apparatus provided with a sheet feeding device according to an embodiment of the present invention. In FIG. 1, reference numeral 200 denotes a printer which is an example of the image forming apparatus; A paper feed port formed on the side wall surface of 200A, 100 is a large-capacity side deck which is a paper feeder detachably mounted on the printer main body 200A, and 10 is an upper door which is a door member of the side deck 100. .
[0028]
Here, as shown in FIG. 2, the printer 200 includes a controller 31 for controlling the printing operation of the printer 200, the paper feeding operation of the side deck 100, and the like. When it is detected that the upper door 10 is opened based on the signal, if the sheet feeding operation is being performed, the sheet feeding motor 33 is stopped, and the pickup roller 8 serving as the conveying unit and the sheet feeding unit serving as the pair of separated sheet feeding units are stopped. The roller 11 and the retard roller 9 are stopped.
[0029]
Further, when the upper door 10 is opened as described above, the pickup roller 8 is retracted upward and the sheet feeding roller 11 and the retard roller 9 are separated from each other as described later.
[0030]
The reason why the pickup roller 8 is retracted upward when the upper door 10 is opened is that, for example, when the upper door 10 is opened to remove a jam of recording paper (jam paper), the pickup roller 8 performs recording. If the jammed paper is pulled down, the drive system of the pickup roller 8 must be rotated through the jammed paper when the jammed paper is pulled out, so that the paper becomes very heavy, the jammed paper is damaged, and the like. In the worst case, the recording paper pieces left in the storage portion enter the image forming apparatus main body, and cause serious damage to the image forming apparatus main body.
[0031]
Further, the paper feed roller 11 and the retard roller 9 are separated from each other because, when performing a jam processing, if the jam paper is stopped in a state of being sandwiched between the paper feed roller 11 and the retard roller 9, the jam paper is removed. This is because a drive load sufficient to rotate a drive system such as a paper feed roller may be applied to the jammed paper when trying to pull it out, which may result in damage to the jammed paper.
[0032]
In this embodiment, when the upper door 10 is opened, the lifter motor 32 is rotated in the reverse direction to lower the lifter plate 30 so that the jam clearing operation and the storage operation of the recording paper can be easily performed. By performing such control, it is possible to secure a good recording paper storage property and to improve the jam clearing property.
[0033]
In FIG. 3, reference numeral 34 denotes a printer unit of the printer 200 which is an image forming unit, and the controller 31 applies, for example, the recording paper fed from the side deck 100 by the printer unit 34 to the printer 200 shown in FIG. The document image read by the reader unit 202 provided at the top is printed out.
[0034]
On the other hand, in FIG. 1, reference numeral 50 denotes a recording paper (sheet) storage unit of the side deck 100. When storing the recording paper S, the upper door 10 is opened and recording formed on the side and upper surfaces of the side deck main body 100A. The paper (sheet) storage opening 51 is opened.
[0035]
Here, the side deck 100 is mounted at a slightly lower position of the printer main body 200A, and is configured to store the recording paper S from a substantially horizontal direction. Accordingly, the upper door 10 is moved as shown in FIG. It is configured to rotate up and down around a rotation shaft 5 provided on the side deck main body 100A.
[0036]
In the present embodiment, for example, the upper door 10 is moved in the opening direction so that the moment applied to the rotating shaft 5 can be reduced by the weight of the upper door 10 and the upper door 10 can be opened with a small force. A rotating spring (not shown) for urging is attached, so that the operability of the user at the time of the opening operation can be improved.
[0037]
By configuring the recording paper storage unit 50, the recording paper storage opening 51, and the upper door 10 in this manner, the opening surface when the upper door 10 is opened is wide and easy to access, and the user can easily access the recording paper S. It is possible to lighten the opening operation feeling when performing the storing operation and the jam clearing operation.
[0038]
Incidentally, in FIG. 3, reference numeral 1 denotes a lever member which is a movable member which is swingably held on the side deck main body 100 </ b> A via a swing shaft 6. One end 1 a of the lever member 1 is connected to the upper door 10. It is in contact with the arm member 3 constituting the pressing portion provided from below.
[0039]
Further, a step portion 1A as an engagement means is formed at one end portion 1a of the lever member 1. For example, when the recording paper S is stored, when the upper door 10 is opened, an arm provided on the upper door 10 is provided. The member 3 first pushes one end 1a of the lever member 1 to swing the lever member 1, and thereafter, when the upper door 10 is opened to a predetermined angle, the arm member 3 fits into the step portion 1A of the lever member 1. It is designed to fit.
[0040]
Here, since the lever member 1 is urged by an urging means (not shown) in a direction opposite to the direction of arrow B, the arm member 3 is stuck in the step portion 1A by the urging force of the urging means. The upper door 10 can be held in an open state at a predetermined angle.
[0041]
As a result, it is not necessary to increase the spring force of the rotary spring (not shown) provided on the rotation shaft 5, and accordingly, the urging force in the opening direction when the door is closed does not increase as in the related art. Further, since a strong holding mechanism is not required as the holding mechanism in the closed state of the door, it is possible to prevent the door opened from the holding mechanism from being opened with excessive force. Further, since a latch feeling can be obtained, if the user opens the door to a predetermined angle, it can be determined that the door is at a predetermined open position, and the door is not opened too much as in the related art, and in the worst case, the hinge is not damaged.
[0042]
In the present embodiment, the step of the step portion 1A of the lever member 1 is set at 6 mm, and the inclination angle at which the upper door 10 is held is set at 60 degrees, thereby providing a good latch feeling and opening operation feeling. Has been created.
[0043]
Reference numeral 4 denotes a photosensor which is an example of a detecting unit for detecting the opening of the upper door 10. The photosensor 4 is shielded from light by a part of the lever member 1 when the upper door 10 is closed, for example. When the upper door 10 is opened and the lever member 1 swings, the light blocking by the lever member 1 is released and the lever member 1 is turned on.
[0044]
The controller 31 (see FIG. 2) detects that the upper door 10 has been opened based on the change of the photo sensor 4 from the OFF state to the ON state. In the case of the present embodiment, the photo sensor 4 is set to change from the OFF state to the ON state when the lever member 1 is tilted 5 degrees from the position where the upper door 10 is closed.
[0045]
Reference numeral 2 denotes a pressure release input arm which is an operating member which is swingably supported on a side deck body 100A of the side deck 100 via a rocking shaft 7, and one end of the pressure release input arm 2 has a lever. A first convex portion 2a is formed on the other end 1b of the member 1 to be in contact with the upper portion, and a second convex portion 2b is formed on the other end of the member 1 and is in contact with the upper end of the pickup release link 12 shown in FIG.
[0046]
Here, the pickup release link 12 is fixed to a pickup release shaft 16 as shown in the figure, and is rotatably held by the side deck main body 100A via the pickup release shaft 16.
[0047]
A shaft 12a protrudes from the lower end of the pickup release link 12, and a retard release link 13 is rotatably and movably attached to the shaft 12a through an elongated hole 13a formed at the upper end. Have been. Further, a retard release arm 15 is attached to the lower end of the retard release link 13 via a mounting shaft 17.
[0048]
With this configuration, when the upper door 10 is opened and the lever member 1 swings, and the pressure release input arm 2 swings accordingly, the second convex portion 2b of the pressure release input arm 2 rotates. The upper end of the pickup release link 12 is pressed, and the pickup release link 12 rotates.
[0049]
Further, when the pickup releasing link 12 rotates in this way, the pickup releasing link 12 rotates and the retard releasing link 13 rotates, and accordingly, the retard releasing arm 15 rotates, and a retard holder 19 described later is pressed. It is supposed to.
[0050]
The pickup release link 12, the retard release link 13, the retard release arm 15, and the retard holder 19 constitute a pressure release mechanism for releasing the pressure contact between the paper feed roller 11 and the retard roller 9.
[0051]
On the other hand, in FIG. 4, reference numeral 18 denotes a roller holder that rotatably supports the pickup roller 8, and the roller holder 18 rotates around the roller shaft 24 of the paper feed roller 11 rotatably supported by the side deck body 100A. It turns.
[0052]
Here, as shown in FIG. 5, the pickup roller 8 is configured to rotate in synchronization with the sheet feeding roller 11 by the rotation drive directly input via the idler gear 23. Further, the pickup roller 8 operates so as to repeat ascending and descending for each sheet during the sheet feeding operation, so that the recording paper S is sent to the sheet feeding roller side one by one.
[0053]
The roller holder 18 is urged by the urging spring 20 toward the recording paper indicated by an arrow F 'so that the roller holder 18 comes into contact with the recording paper with a predetermined contact pressure when the pickup roller 8 is in a lowered state. .
[0054]
On the other hand, as shown in FIG. 4, a pickup release arm 14 is provided at the other end of the pickup release shaft 16 of the pickup release link 12, and the pickup release arm 14 rotates integrally with the pickup release link 12. As a result, the locking portion 18a protruding from the roller holder 18 is pressed. The pickup releasing link 12, the pickup releasing arm 14, and the roller holder 18 constitute a separating mechanism for separating the pickup roller 8 from the recording sheet S.
[0055]
By being pressed by the pickup release arm 14 in this manner, the roller holder 18 rotates upward about the roller shaft 24 while resisting the urging spring 20, whereby the pickup roller 8 is temporarily removed. Even if the user has landed on the recording paper, the user is forced to retreat upward.
[0056]
4 and 5, reference numeral 19 denotes a retard holder which rotatably supports the retard roller 9 via a retard shaft 25. The retard holder 19 rotates around the side deck main body 100A via a rotation shaft 22. It is movably held, and is urged by a retard spring 21 toward the sheet feed roller at a predetermined retard pressure. When the upper door 10 is opened, the retard holder 19 is pressed by the retard release arm 15 and rotates in the direction of arrow G as described above, whereby the retard roller 9 is separated from the paper feed roller 11, and The pressure contact is released.
[0057]
The retard roller 9 rotates in a direction opposite to the sheet feeding direction by a driving force transmitted from a driving source (not shown) to the retard shaft 25. Further, the retard roller 9 is configured to run idle when a torque equal to or more than a predetermined torque is transmitted by a torque limiter 26 attached to a retard shaft 25, and a plurality of recording sheets are fed by the function of the torque limiter 26. The paper is not set.
[0058]
Next, a door opening detection operation, a retracting operation of the pickup roller 8 and a separating operation of the retard roller of the sheet feeding device configured as described above will be described.
[0059]
When the user opens the upper door 10 for, for example, clearing a jam, the upper door 10 rotates in the direction of arrow A shown in FIG. 3, and the arm member 3 provided on the upper door 10 One end 1a is pressed, whereby the lever member 1 swings in the direction of arrow B. Here, when the lever member 1 swings in this way, the photo sensor 4 was in the OFF state before the swing of the lever member 1 because a part of the lever member 1 was shielded from light. When the lever 1 swings, a part of the lever member 1 is displaced from the optical axis of the photosensor 4, and the light blocking of the photosensor 4 is released, and the ON detection is performed.
[0060]
The controller 31 detects that the upper door 10 has been opened based on the change of the photosensor 4 from the OFF state to the ON state. The roller 8, the paper feed roller 11, and the retard roller 9 are stopped.
[0061]
Also, when the upper door 10 is opened by the user and is opened to a predetermined opening angle, the arm member 3 provided on the upper door 10 fits into the step portion 1A of the lever member 1 as shown in FIG. . At this time, since the lever member 1 is urged in the direction opposite to the direction of the arrow B, the arm member 3 is held in a state of being fitted into the step portion 1A by this urging force. It is kept open until
[0062]
On the other hand, when the lever member 1 swings in this way, the press-contact release input arm 2 is pressed by the lever member 1 and swings in the direction of arrow C in the figure. When the pressure release input arm 2 swings in this manner, the second protrusion 2b of the pressure release input arm 2 presses the upper end of the pickup release link 12 as shown in FIG. It rotates in the direction of arrow D with the pickup release shaft 16 as the center of rotation.
[0063]
Further, when the pickup release link 12 rotates in this manner, the pickup release arm 14 provided at the other end of the pickup release shaft 16 presses the locking portion 18a protruding from the roller holder 18, and the roller The holder 18 rotates in the direction of arrow F shown in FIG.
[0064]
As a result, the pickup roller 8 attached to the other end of the roller holder 18 is forcibly retracted upward even if it has fallen on the recording paper to be removed.
[0065]
On the other hand, when the pickup release link 12 rotates in this manner, the retard release link 13 rotatably and movably attached to the lower end of the pickup release link 12 uses the shaft 12a of the pickup release link 12 as a fulcrum in the direction of arrow E in FIG. To rotate.
[0066]
Then, when the retard release link 13 rotates in this manner, the retard release arm 15 attached to the mounting shaft 17 of the retard release link 13 rotates in the direction of arrow E in FIG. The retard holder 19 rotates in the direction G in the drawing while opposing the retard spring 21, the retard roller 9 is separated from the sheet feeding roller 11, and the pressure contact is released.
[0067]
As described above, when the upper door 10 is opened, the pickup roller 8 is retracted, and the retard roller 9 is separated, so that good operability can be realized when removing the jammed recording paper. .
[0068]
Further, when the upper door 10 is opened, it is detected that the upper door 10 is opened by the movement of the lever member 1 and the separation mechanism and the pressure release mechanism are operated in conjunction with the movement of the lever member 1. The structure for detecting the opening and closing of the upper door 10, releasing the pressure contact between the retard roller 9 and the paper feed roller 11, and retracting the pickup roller 8 can be simplified, and the cost can be reduced.
[0069]
In the present embodiment, since it is assumed that the side deck 100 is separated from the printer main body 200 to perform the jam processing, the detachable lever (not shown) is set to be displaced according to the position from the printer main body 200, and By inputting the displacement of the detachment lever to the other end of the retard release arm 15 in conjunction with the detachment operation of the side deck 100 from the printer main body 200, the retard release arm 15 is rotated in the direction of arrow E in FIG. Is also good.
[0070]
Here, when such an input is performed, the separation of the retard roller 9 and the retraction of the pickup roller 8 upward are performed equally by the reverse input sequence of the link mechanism described above. ing.
[0071]
In the above description, a photo sensor is taken as an example of the detecting means. However, the same effect can be obtained by a contact type sensor such as a micro switch that detects the movement of the lever member 1 by contact with the lever member 1. Needless to say. In the description so far, the stepped portion 1A provided on the lever member 1 has been described as an example of the engagement means, but it goes without saying that a depression, a V-shaped bend, or other concave shape may be used.
[0072]
【The invention's effect】
As described above, according to the present invention, when the door member is opened at a predetermined angle, the moving member that is pressed by the pressing portion provided on the door member and moves is provided at the contact portion with the door member. By engaging the pressing portion of the door member with the combining means, the door member can be held in an open state at a predetermined angle.
[0073]
Further, when the door member is opened, the opening of the door member is detected by the movement of the moving member, and the sheet is sent out from the separating mechanism and the conveying unit that separates the conveying unit from the sheet in conjunction with the movement of the moving member. Activating a pressure release mechanism that separates a pair of press-contact separated sheet feeding means that separates and feeds separated sheets one by one, detects opening and closing of the door member, cancels pressure contact of the separated sheet feeding means, and retracts the conveyance means. Structure can be simplified.
[Brief description of the drawings]
FIG. 1 is a perspective view of an image forming apparatus provided with a sheet feeding device according to an embodiment of the present invention.
FIG. 2 is a control block diagram of the image forming apparatus.
FIG. 3 is an enlarged view of an upper door portion of the paper feeding device.
FIG. 4 is a perspective view illustrating a separation mechanism and a pressure release mechanism of the paper feeding device.
FIG. 5 is a diagram illustrating a state of a pickup roller, a sheet feeding roller, and a retard roller when the upper door is closed.
FIG. 6 is a perspective view illustrating the state of the upper door when the upper door is opened.
FIG. 7 is a perspective view illustrating a state of a separating mechanism and a pressure release mechanism when the upper door is opened.
FIG. 8 is a diagram illustrating a state of a pickup roller, a sheet feeding roller, and a retard roller when the upper door is opened.
FIG. 9 is a perspective view of a conventional sheet feeder and an image forming apparatus including the same.
[Explanation of symbols]
1 lever member
1A Step
2 Pressure release input arm
3 Arm members
4 Photo sensor
8 Pickup roller
9 retard roller
10 Upper door
11 Paper feed roller
12 Pickup release link
13 retard release link
14 Pickup release arm
15 Retardation release arm
18 Roller holder
19 retard holder
31 Controller
34 Printer section
50 Recording paper compartment
51 Recording paper storage opening
100 side deck
200 printer
200A Printer body

Claims (5)

A sheet storage unit provided inside the main body, and a door member that opens and closes a sheet storage opening provided in the sheet storage unit, and performs a sheet feeding operation when the door member is closed In the device,
When the door member is opened, a moving member that is pressed and moved by a pressing portion provided on the door member,
Detection means configured to detect the opening of the door member by movement of the moving member,
When the door member is opened at a predetermined angle, engagement means for engaging with a pressing portion provided on the door member and holding the door member opened at a predetermined angle,
Equipped with a,
The paper feeder is characterized in that the moving means is urged by an urging means in a direction opposite to the moving direction, and the engagement state with the engaging means is maintained by the urging force of the urging means . A sheet storage unit provided inside the main body, and a door member that opens and closes a sheet storage opening provided in the sheet storage unit, and performs a sheet feeding operation when the door member is closed In the device,
When the door member is opened, a moving member that is pressed and moved by a pressing portion provided on the door member,
Detection means configured to detect the opening of the door member by movement of the moving member,
When the door member is opened at a predetermined angle, engagement means for engaging with a pressing portion provided on the door member and holding the door member opened at a predetermined angle,
With
The paper feeding device according to claim 1, wherein the engaging means is a concave portion or a notch provided in a contact portion of the moving member with the door member. Conveying means that is provided so as to be able to contact and separate from the sheet stored in the sheet storage unit and sends out the sheet in contact with the sheet,
A pair of press-contacting separated sheet feeding means for separating and feeding the sheets sent from the conveying means one by one;
When the door member is opened, a separation mechanism that separates the conveyance unit that is in contact with the sheet from the sheet,
When the door member is opened, the pair of separated sheet feeding units are separated from each other, and when the door member is closed, a pressure release mechanism that presses the pair of separated sheet feeding units,
An operating member that operates the separation mechanism and the pressure release mechanism in conjunction with the movement of the moving member;
3. The sheet feeding device according to claim 1, further comprising: The sheet storage unit is a structure that is substantially housed than the horizontal sheet, said sheet accommodating opening sheet feeding apparatus according to claim 1 or 2, wherein the is formed over the side surface and upper surface of the body. In an image forming apparatus including an image forming unit and a sheet feeding device that feeds a sheet to the image forming unit,
Image forming apparatus, wherein the sheet feeding device is intended while being detachably attached to the image forming apparatus main body, according to any one of claims 1 to 4.

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