JP6971708B2 - Sheet feeding device and image forming device - Google Patents

Description

The present invention relates to a sheet feeding device for feeding a sheet and an image forming apparatus including the same.

Conventionally, a sheet feeding device having an inclined surface member for separating sheets fed by a paper feed roller one by one has been proposed (see Patent Document 1). The inclined surface member has an obtuse angle with respect to the paper feed tray on which the sheets are loaded, and the sheets fed by the paper feed rollers are separated one by one as they pass through the inclined surface. .. An opening is formed in the inclined surface member, and a butt member with which the tip of the sheet abuts protrudes from this opening. The sheet to be inserted into the paper feed tray is set at an appropriate setting position by abutting the tip against the abutting member located at the protruding position.

The abutting member is urged by the spring member toward the retracted position retracted from the inclined surface, and is positioned at the protruding position by being pushed out by the cam member against the urging force of the spring member. The cam member is driven by a motor, and the motor can be driven forward and reverse to move the cam member to a protruding position or a retracted position.

Japanese Unexamined Patent Publication No. 2016-052950

The sheet feeding device described in Patent Document 1 positions the abutting member in the retracted position at the beginning of the job in a job of continuously forming an image on a plurality of sheets, and projects the abutting member at the end of the job. The cam member is controlled so as to be positioned at the position. For this reason, the abutting member does not push back the sheet leaning against the inclined surface in the middle of the job, which may cause a feeding failure.

Therefore, an object of the present invention is to provide a sheet feeding device capable of reducing image defects of a sheet and an image forming device provided with the same.

INDUSTRIAL APPLICABILITY In the sheet feeding device, the sheet feeding device is loaded on the loading surface, a loading portion having a loading surface on which the sheet is loaded, a separated slope portion having an inclined surface having an inclined angle formed by the loading surface, and the loading surface. It has a feeding section that feeds the sheet toward the separation slope portion and a contact surface that the tip of the sheet loaded on the loading surface abuts, and at least a part of the contact surface is the separation slope portion. A contact member that can be moved to a first position that is closer to the feeding portion and a second position where the contact surface is located farther from the separation slope portion to the feeding portion. A transmission mechanism having a driving source for generating a driving force and a rotating body whose stop is controlled for each rotation, and capable of transmitting the driving force of the driving source to the feeding unit via the rotating body, and the rotation. In conjunction with the body, the contact member is positioned at the first position when the rotating body is stopped, and the contact member is moved from the first position to the second position when the rotating body rotates. after moving to a position, e Bei and a moving mechanism for moving toward the first position from the second position, the moving mechanism may feed sheets by the feed section to the abutment member The contact member is moved from the first position to the second position before reaching, and the contact member is moved from the second position to the first position while the sheet passes through the contact member. It is characterized by that.

According to the present invention, the contact member moves between the first position and the second position in conjunction with the rotating body which is connected to the feeding unit and is stopped and controlled for each rotation, so that one sheet is supplied. The contact member can be positioned at the first position each time it is fed, and image defects of the sheet can be reduced.

Overall schematic showing the printer. The perspective view which shows the sheet feeding device. Sectional drawing which shows the sheet feeding apparatus. (A) is a cross-sectional view showing a butt member located at a protruding position, and (b) is a cross-sectional view showing a butt member located at a retracted position. The perspective view which shows the transmission mechanism and the movement mechanism. (A) is a rear view showing a state in which the control gear is located in the standby position, and (b) is a rear view showing a state in which the control gear is rotated by a predetermined amount from the standby position.

〔overall structure〕
Hereinafter, the present embodiment will be described. The printer 10 as an image forming apparatus is an electrophotographic monochrome laser beam printer. As shown in FIG. 1, the printer 10 has an image forming unit 14 that forms an image on the sheet S, a sheet feeding device 13, a fixing device 15, and a discharge roller pair 6.

The sheet feeding device 13 has a control unit 80 that controls each part of the printer 10 including each part of the sheet feeding device 13. Under the control of the control unit 80, the printer 10 forms an image on the sheet S fed by the sheet feeding device 13 based on the image information input from an external device such as a computer. In the present embodiment, the control unit 80 is provided on the control board that controls the printer 10. However, the sheet feeding device 13 is composed of units, and the control unit 80 is provided in the unit of the sheet feeding device to provide a printer. It may be connected to the control unit of 10 by an electric signal.

The image forming unit 14 includes a detachable process cartridge 11, an exposure device 3, and a transfer roller 12, and the process cartridge 11 includes a photosensitive drum 1, a charging roller 2, a developing roller 4, and the like. have. The photosensitive drum 1 has a cylindrical member and a photosensitive layer arranged on the surface of the cylindrical member, and can be rotated by driving a motor (not shown). The charging roller 2 charges the surface of the photosensitive drum 1 to a uniform potential by the applied charging voltage. The exposure apparatus 3 scans the laser beam to form an electrostatic latent image of the image on the surface of the photosensitive drum 1. The developing roller 4 carries toner and supplies it to the photosensitive drum 1, and develops an electrostatic latent image of the photosensitive drum 1 as a toner image.

In parallel with the image forming process by the image forming unit 14, the sheet S is fed from the sheet feeding device 13 and is conveyed to the nip N1 of the transfer roller pair 17. Then, the sheet S is conveyed toward the transfer nip N2 formed by the photosensitive drum 1 and the transfer roller 12 by the transfer roller pair 17. A registration roller pair that transfers the sheet S may be provided between the transfer roller pair 17 and the transfer nip N2 in accordance with the transfer timing in the transfer nip N2.

The toner image supported on the photosensitive drum 1 is transferred to the sheet S at the transfer nip N2 by applying a bias voltage to the transfer roller 12. Adhesions such as transfer residual toner remaining on the photosensitive drum 1 without being transferred to the sheet S are removed by a cleaner (not shown). The sheet S on which the unfixed image is formed is heated while being pressurized by the fixing roller pair 5 of the fixing device 15. As a result, the toner image transferred to the sheet S is melted and fixed. The sheet S on which the image is fixed by the fuser 15 is discharged to the discharge tray 18 by the discharge roller pair 6, and the printing operation is completed.

[Sheet feeder]
As shown in FIG. 1, the sheet feeding device 13 has a feeding tray 8 as a loading unit, and the feeding tray 8 has a loading surface 8a on which the sheet S is loaded. The feeding tray 8 is provided with an auxiliary tray 7 that can be pulled out. The position of the seat S loaded on the loading surface 8a is regulated by a pair of side regulating plates (not shown) in the width direction orthogonal to the seat feeding direction. In FIG. 1, the right side is the front surface (operation side) of the printer 10, and an insertion port 81 for inserting the sheet S into the sheet feeding device 13 is formed on the front surface of the printer 10.

A transport guide 21 is provided downstream of the feed tray 8 in the sheet feeding direction, and the transport guide 21 supports a flag member 19 that is rotatable around a rotation shaft 33. The flag member 19 is arranged so as to project from the transport guide 21 toward the front side (right side in FIG. 1) of the printer 10 in a natural state, and when the user inserts the sheet S into the feeding tray 8, the flag member 19 of the sheet S is arranged. It is pressed by the tip and rotates. By rotating the flag member 19, the photo sensor 20 is shielded from light, and it can be detected that the sheet S is loaded on the feed tray 8.

FIG. 2 is a perspective view showing the seat feeding device 13, and FIGS. 3 and 4 are cross-sectional views showing the seat feeding device 13. In addition, in these FIGS. 2 to 4, the illustration of the flag member 19 is omitted. As shown in FIG. 2, the sheet feeding device 13 includes a feeding mechanism 23, a transmission mechanism 40 capable of transmitting the driving force of the motor M as a driving source to the feeding mechanism 23, and a butt member 52 described later. It has a movable moving mechanism 60 and a movable mechanism 60.

The feeding mechanism 23 has a rotating shaft 25, a holder 24 rotatably supported by the rotating shaft 25, and a pickup roller 26 as a feeding unit rotatably supported by the tip of the holder 24. ing. The holder 24 has a drive train 27 composed of gears or the like between the rotary shaft 25 and the pickup roller 26, and the rotation of the rotary shaft 25 is transmitted to the pickup roller 26 via the drive train 27. .. The holder 24 can swing according to the height of the sheet bundle loaded on the loading surface 8a (see FIG. 1) of the feeding tray 8. Then, the pickup roller 26 rotates with the pickup roller 26 in contact with the uppermost seat S, so that the seat S is fed toward the transport guide 21.

As shown in FIG. 3, the transport guide 21 as the main body portion has an inclined surface 21a having an angle θ1 formed by the feeding tray 8 with the loading surface 8a having an obtuse angle. A slope cover 49 having a low transfer resistance is provided on the surface of the inclined surface 21a so as to smoothly guide the sheet S to the transfer roller pair 17. Further, the transport guide 21 supports a separating member 50 urged by a separating spring 51 so as to project from the inclined surface 21a and the inclined surface cover 49 toward the pickup roller 26. The separation member 50 and the separation spring 51 are provided with three symmetrical transport path centers in the width direction. The separation member 50, the slope cover 49, and the transport guide 21 constitute the separation slope portion 70.

The surface 50a of the separating member 50 has a plurality of irregularities formed along the inclined surface 21a, and the separating member 50 has a protruding position protruding from the inclined surface 21a and the slope cover 49 toward the pickup roller 26 and an inclined surface. It is possible to move to the evacuation position to evacuate to the inside of 21a. When the sheet S is fed by the pickup roller 26, the separating member 50 moves from the protruding position to the retracting position against the urging force of the separating spring 51, but the surface of the separating member 50 has irregularities. , The sheets S can be effectively separated one by one.

A transport roller pair 17 is arranged downstream of the separating member 50 in the traveling direction D of the sheet. The transport roller pair 17 has a drive roller 29 and a driven roller 30, and the driven roller 30 is urged toward the drive roller 29 by a spring (not shown) with a predetermined pressure. The rotating shaft 29a of the drive roller 29 is rotatably supported by the bearing 31, and the bearing 31 is fitted to the transport guide 21.

[Abutting member]
As shown in FIGS. 2 and 3, an opening 21b is formed in the inclined surface 21a, and the abutting member 52 as an abutting member is housed in the opening 21b. The opening 21b and the abutting member 52 are provided with two symmetrical transport path centers in the width direction. As shown in FIG. 5, the left and right abutting members 52, 52 are provided on the rotation shaft 52a, and a stopper bent in a U shape is provided between the left and right abutting members 52, 52. A portion 56 is provided.

The abutting member 52 can rotate between the protruding position shown in FIG. 4A and the retracted position shown in FIG. 4B by rotating the rotation shaft 52a, and the stopper portion When the 56 abuts on the transport guide 21 or other frame, the movement is restricted at the retracted position. The abutting member 52 has a contact surface 57 capable of contacting the tip of the sheet S, and the contact surface 57 is formed in a stepped shape having a plurality of curved surfaces. Therefore, even when the tip of the sheet S vigorously contacts the contact surface 57 of the abutting member 52, the force acting on the sheet S can be dispersed and the damage to the sheet S can be reduced.

When the abutting member 52 is located at the protruding position as the first position, as shown in FIG. 4A, at least a part of the contact surface 57 is located closer to the pickup roller 26 than the separation slope portion 70. positioned. At this time, as shown in FIG. 3, the angle θ2 formed by the contact surface 57 and the loading surface 8a of the feed tray 8 is an acute angle. Therefore, when the user inserts the sheet S into the sheet feeding device 13, the sheet S can be reliably abutted by the contact surface 57. As a result, it is possible to prevent the seat S from leaning against the inclined surface 21a or getting over the inclined surface 21a and being niped into the transport roller pair 17, and it is possible to reduce feeding defects.

When the abutting member 52 is located at the retracted position as the second position, the contact surface 57 is located at a position farther from the separation slope portion 70 to the pickup roller 26 as shown in FIG. 4 (b). .. Therefore, when the sheet S is fed by the pickup roller 26 and passes through the separation slope portion 70, the contact surface 57 of the abutting member 52 does not abut on the sheet S. As a result, when the sheets S are separated one by one by the separation slope portion 70, the abutting member 52 does not interfere with the sheet S, and the sheets S can be reliably separated.

[Transmission mechanism]
Next, the transmission mechanism 40 will be described in detail with reference to FIG. As shown in FIG. 5, the transmission mechanism 40 has an input gear 41, a control gear 42, an output gear 43, a solenoid 44, and a locking claw 58, and is driven by a motor M. The force can be transmitted to the pickup roller 26 (see FIG. 2).

The motor M rotates in only one direction to generate a driving force. The input gear 41 is connected to the motor M, and the output gear 43 is fixed to a rotating shaft 25 (see FIG. 2) for rotating the pickup roller 26. Gear portions are formed on the outer peripheral surfaces of the input gear 41 and the output gear 43 over the entire circumference. The control gear 42 as a rotating body includes a locked portion 42b to which the claw portion 58a of the locking claw 58 can be locked, and a first tooth missing portion 59a and a second tooth portion 59a in which the gear portion is not formed only on a part of the outer peripheral surface. It has a missing tooth portion 59b. The locked portion 42b, the first missing tooth portion 59a, and the second missing tooth portion 59b are provided at different positions in the axial direction of the control gear 42. In addition, in each of the plane orthogonal to the axial direction including the first missing tooth portion 59a and the plane orthogonal to the axial direction including the second missing tooth portion 59b, other than the first missing tooth portion 59a and the second missing tooth portion 59b. A gear portion is formed on the outer peripheral surface of the control gear 42 in the portion.

As shown in FIG. 5, the rotation position (phase) of the control gear 42 in a state where the claw portion 58a of the locking claw 58 locks the locked portion 42b is set as the standby position. In the state where the control gear 42 is located in the standby position, the input gear 41 faces the first tooth missing portion 59a, and the output gear 43 faces the second missing tooth portion 59b. Therefore, the driving force is not transmitted to each other between the input gear 41, the control gear 42, and the output gear 43.

The locking claw 58 is urged in a direction of locking the locked portion 42b by a spring (not shown), and by operating the solenoid 44, the locked portion 42b resists the urging force of the spring. On the other hand, it moves so that it is in an unlocked state. That is, when the solenoid 44 is activated, the locked state between the locking claw 58 and the locked portion 42b of the control gear 42 is released. Further, the control gear 42 has a built-in compression spring (not shown), and when the locked state between the locking claw 58 and the locked portion 42b is released, the control gear 42 is displaced by the urging force of the compression spring. Rotate a predetermined amount. As a result, the gear portion of the control gear 42 and the input gear 41 mesh with each other, and the driving force is transmitted from the input gear 41 to the control gear 42.

[Movement mechanism]
Next, the moving mechanism 60 will be described in detail with reference to FIGS. 5 to 6 (b). As shown in FIGS. 5 to 6B, the moving mechanism 60 has a link member 53, and the link member 53 is attached to the link member 53 from one end of a rotation shaft 52a to which the abutting members 52, 52 are fixed. An engaging hole portion 53a that can be engaged is formed in the engaging portion 52b extending in a crank shape. That is, the engaging portion 52b is provided so as to be radially offset from the rotating shaft 52a. The link member 53 can move in the direction of arrow E1 and the direction of arrow E2 opposite to the direction of arrow E1, and is urged in the direction of arrow E1 by the link spring 54 as an urging portion.

As shown in FIG. 6A, a half-moon-shaped protrusion 62 is provided on the side of the control gear 42 facing the link member 53, and a boss portion 42a extends axially from the protrusion 62. There is. The boss portion 42a is arranged at a position different in the radial direction with respect to the rotation center 42c of the control gear 42, and is configured to make a circular motion by rotating the control gear 42. Further, the return lever 45 is configured to be abuttable to the flat surface portion 62a of the protrusion 62, and the return lever 45 is rotatably supported around the rotation shaft 45a. The return lever 45 is urged toward the flat surface portion 62a by the lever spring 46. Further, the link member 53 has a semicircular boss engaging portion 53b that can be engaged with the boss portion 42a, and a cam portion 53c that is pressed while sliding on the protrusion 62. The boss portion 42a as the positioning portion engages with the boss engaging portion 53b as the engaging portion to position the abutting member 52 at the protruding position.

[Feeding operation]
Next, the operation of the transmission mechanism 40 and the operation of the moving mechanism 60 will be described together with the feeding operation of feeding the sheet. Hereinafter, a case where a continuous print job for continuously printing on a plurality of sheets is input will be described.

First, before the continuous printing job is input, the control gear 42 is located in the standby position, and as shown in FIG. 6A, the boss portion 42a engages with the boss engaging portion 53b. Moreover, the return lever 45 is in contact with the flat surface portion 62a. Further, the solenoid 44 is in a non-operating state, and as shown in FIG. 5, the claw portion 58a of the locking claw 58 locks the locked portion 42b of the control gear 42. As a result, the control gear 42 is securely held in the standby position. At this time, the first tooth missing portion 59a and the second missing tooth portion 59b of the control gear 42 face the input gear 41 and the output gear 43, respectively. Further, the abutting member 52 is located at a protruding position as shown in FIG. 4A. The user inserts the sheet S from the insertion port 81 (see FIG. 1) in the state where the abutting member 52 is located at the protruding position, and the tip of the sheet S is the contact surface 57 of the abutting member 52. Butt to.

When a continuous print job is input, the control unit 80 (see FIG. 1) drives the motor M in one direction and operates the solenoid 44 for a predetermined time to move the locking claw 58. Then, the locked state of the claw portion 58a of the locking claw 58 and the locked portion 42b of the control gear 42 is released, and the control gear 42 is rotated in one direction by a compression spring (not shown) built in the control gear 42. start. When the control gear 42 rotates, the input gear 41 meshes with the gear portion of the control gear 42, and the driving force of the motor M is transmitted to the control gear 42 via the input gear 41.

As the control gear 42 is rotated by the driving force of the motor M, the boss portion 42a provided on the control gear 42 is separated from the boss engaging portion 53b of the link member 53 as shown in FIG. 6 (b). The engagement between the boss portion 42a and the boss engaging portion 53b is released. Further, the return lever 45 is rotated by the protrusion 62 against the urging force of the lever spring 46. Then, the link member 53 moves in the direction of arrow E1 due to the urging force of the link spring 54, and the engaging hole portion 53a engaged with the engaging portion 52b moves in the direction of arrow E1 as shown in FIG. As a result, the rotation shaft 52a rotates. As a result, the abutting members 52, 52 fixed to the rotation shaft 52a move from the protruding position to the retracted position. The link member 53 moves relatively quickly because the boss portion 42a and the boss engaging portion 53b are disengaged from each other and the link member 53 moves quickly due to the urging force of the link spring 54. Therefore, the abutting member 52 moves relatively quickly from the protruding position to the retracted position. Specifically, the abutting member 52 moves from the protruding position to the retracted position with a quick movement of several tens of milliseconds.

After the abutting member 52 moves to the retracted position, the output gear 43 begins to mesh with the gear portion of the control gear 42. That is, the second tooth missing portion 59b of the control gear 42 is provided in a wider range than the first missing tooth portion 59a, and the output gear 43 is the first from the standby position until the control gear 42 rotates by a predetermined angle. 2 It remains facing the missing tooth portion 59b. Therefore, the seat S is not fed by the pickup roller 26 until the abutting member 52 moves to the retracted position.

When the output gear 43 is rotated by the control gear 42, the pickup roller 26 is rotated and the seat S is fed from the loading surface 8a. Before the control gear 42 makes one rotation from the standby position, the boss portion 42a provided on the control gear 42 is in sliding contact with the cam portion 53c of the link member 53. The boss portion 42a presses while sliding against the cam portion 53c, and the link member 53 moves in the direction of arrow E2 against the urging force of the link spring 54 as shown in FIG. 6A. As the link member 53 moves in the direction of arrow E2 in this way, the abutting member 52 gradually moves from the retracted position to the protruding position. Then, the boss portion 42a engages with the boss engaging portion 53b when the control gear 42 is in the standby position, and at this time, the abutting member 52 returns to the protruding position.

The above is stop control for each rotation of the control gear 42, that is, one rotation control. However, by one rotation of the control gear 42, the seat S is moved at least until the tip is nipped into the transfer roller pair 17. .. The sheet S nipped in the transfer roller pair 17 is conveyed downstream in the sheet transfer direction by the transfer roller pair 17, and at this time, the pickup roller 26 abuts on the transferred sheet S and is carried around. However, in the state where the control gear 42 is located in the standby position, the second missing tooth portion 59b of the control gear 42 and the output gear 43 face each other, so that the rotation of the output gear 43 is transmitted to the control gear 42. It is possible to prevent tooth skipping and breakage of the gear.

Then, in the continuous printing job, the motor M rotates until the job is completed, and the solenoid 44 is operated in accordance with the feeding timing of each sheet S. As a result, each time one sheet is fed, the boss portion 42a is disengaged from the boss engaging portion 53b, presses the cam portion 53c, and engages with the boss engaging portion 53b. Perform a series of operations. Therefore, the abutting member 52 moves from the protruding position to the retracted position before the sheet S reaches the abutting member 52.

Further, while the sheet S passes through the abutting member 52, the abutting member 52 moves from the retracted position to the protruding position. At this time, the abutting member 52 is moved from the retracted position to the protruding position by the link member 53 pressed along the cam portion 53c by the boss portion 42a, but is more than when moving from the protruding position to the retracted position. Operation is slow. That is, when the abutting member 52 moves from the protruding position to the retracted position, the link member 53 moves relatively quickly in the direction of arrow E2 due to the urging force of the link spring 54. Further, when the abutting member 52 moves from the retracted position to the protruding position, the link member 53 moves along the cam portion 53c by the boss portion 42a at a speed slower than the speed at which the link member 53 moves due to the urging force of the link spring 54. It is slowly pressed in the direction of arrow E1.

As a result, when the abutting member 52 moves from the retracted position to the protruding position, the vibration of the sheet S by the abutting member 52 can be reduced, and image defects can be reduced. Further, since the abutting member 52 moves from the retracted position to the protruding position while the sheet S passes through the abutting member 52, it is possible to close the space between the sheets of the sheet S and improve the productivity. Further, the control gear 42 can be miniaturized.

Further, since the abutting member 52 returns to the protruding position every time one sheet is fed, it is possible to reduce the sheet S from leaning against the separation slope portion 70 in the middle of the job and reduce the feeding failure. can. Further, although the motor M rotates only in one direction, the abutting member 52 can be moved between the protruding position and the retracted position in conjunction with the feeding of the seat S with a simple mechanical configuration. , Cost reduction and miniaturization can be achieved.

In this embodiment, one rotation control of the control gear 42 is realized by using the solenoid 44, the first tooth missing portion 59a, the second missing tooth portion 59b, and the like, but the present invention is not limited to this. For example, the first missing tooth portion 59a of the control gear 42 is omitted, the input gear 41 is configured to always mesh with the control gear 42, and a torque limiter is provided between the input gear 41 and the rotation shaft of the input gear 41. May be good. Further, a configuration in which the control gear 42 is controlled by one rotation by an electromagnetic clutch or another clutch mechanism may be applied. Further, if the operation of moving the abutting member 52 from the retracted position to the protruding position is configured to be slower than the operation of moving from the ejected position to the retracted position, the control gear 42 does not have to be controlled for one rotation. ..

Further, the feed tray 8 may be provided with a middle plate that can be raised and lowered, and the middle plate may be raised and lowered in accordance with the one-rotation control of the control gear 42. For example, a cam may be provided on the rotating shaft 25, and a cam follower that can engage with the cam may be provided on the middle plate. Further, the holder 24 for raising and lowering the pickup roller 26 may be swung for each sheet.

Further, although the present embodiment has been described using the electrophotographic printer 10, the present invention is not limited thereto. For example, the present invention may be applied to a full-color electrophotographic printer or other image forming apparatus such as a copier, a facsimile, or a multifunction device. The present invention can also be applied to an inkjet image forming apparatus that forms an image on a sheet by ejecting an ink liquid from a nozzle.

8: Loading part (feeding tray) / 8a: Loading surface / 10: Image forming device (printer) / 13: Sheet feeding device / 14: Image forming part / 21: Main body part (transport guide) / 21a: Inclined surface / 21b: Opening / 26: Feeding part (pickup roller) / 40: Transmission mechanism / 42: Rotating body (control gear) / 42a: Positioning part (boss part) / 52: Contact member (butting member) / 53: Link member / 53b: Engaging part (boss engaging part) / 53c: Cam part / 54: Bounce part (link spring) / 57: Contact surface / 60: Moving mechanism / 70: Separation slope part / M : Drive source (motor) / θ2: Angle (angle)

Claims (11)

A loading section with a loading surface on which the sheet is loaded,
A separated slope portion having an inclined surface having an obtuse angle with the loading surface,
A feeding unit that feeds the sheet loaded on the loading surface toward the separated slope portion, and a feeding unit.
A first position having an abutting surface to which the tip of a sheet loaded on the loading surface abuts, and at least a part of the abutting surface located closer to the feeding portion than the separation slope portion, and the above. A contact member that can be moved to a second position where the contact surface is located farther from the separation slope portion to the feeding portion.
The drive source that generates the driving force and
A transmission mechanism having a rotating body whose stop is controlled for each rotation and capable of transmitting the driving force of the driving source to the feeding unit via the rotating body.
In conjunction with the rotating body, the contact member is positioned at the first position when the rotating body is stopped, and the contact member is moved from the first position to the first position when the rotating body rotates. after moving to the second position, Bei example and a moving mechanism for moving toward the first position from the second position,
The moving mechanism moves the abutting member from the first position to the second position before the sheet fed by the feeding unit reaches the abutting member, and the sheet moves the abutting member. The contact member is moved from the second position to the first position during passage.
A sheet feeding device characterized by that. Wherein the feeding unit by the rotating body is rotated 1 is fed one sheet of stacked sheets on the stacking surface,
The sheet feeding device according to claim 1. The moving mechanism has a positioning portion provided on the rotating body, an engaging portion that can be engaged with the positioning portion, a link member connected to the contact member, and the contact member having the second contact member. It has an urging portion that urges the link member so as to move toward a position, and has.
The contact member is held at the first position against the urging force of the urging portion by engaging the positioning portion with the engaging portion of the link member.
The sheet feeding device according to claim 1 or 2, wherein the sheet feeding device is characterized by the above. The positioning portion engages with the engaging portion when the rotating body is stopped.
The sheet feeding device according to claim 3, wherein the sheet feeding device is characterized by the above. The positioning portion is arranged at a position different in the radial direction with respect to the rotation center of the rotating body.
The sheet feeding device according to claim 3 or 4, wherein the sheet feeding device is characterized by the above. The link member has a cam portion pressed by the positioning portion and has a cam portion.
When the rotating body makes one rotation, the positioning portion is disengaged from the engaging portion, presses the cam portion, and engages with the engaging portion.
The sheet feeding device according to any one of claims 3 to 5, wherein the sheet feeding device is characterized. The link member is moved by the urging force of the urging portion so that the contact member is positioned at the second position by disengaging the engaging portion from the positioning portion, and the link member is moved by the urging force of the urging portion. When the cam portion is pressed by the positioning portion against the urging force of the urging portion, the contact member is moved from the second position to the first position.
When the cam portion is pressed by the positioning portion, the link member is moved at a speed slower than the speed at which the link member is moved by the urging force of the urging portion.
The sheet feeding device according to claim 6. The separation slope portion includes an opening in which the contact member located at the second position is stored, a main body portion having the inclined surface, and a separating member arranged along the inclined surface and having a plurality of irregularities. Have,
The sheet feeding device according to any one of claims 1 to 7. The angle formed by the loading surface and the contact surface of the contact member located at the first position is an acute angle.
The sheet feeding device according to any one of claims 1 to 8, wherein the sheet feeding device is characterized. The drive source is a motor that rotates in only one direction.
The sheet feeding device according to any one of claims 1 to 9. The sheet feeding device according to any one of claims 1 to 10.
An image forming unit for forming an image on a sheet fed by the sheet feeding device is provided.
An image forming apparatus characterized in that.

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