JP6733003B2 - Sheet stacking apparatus, sheet feeding apparatus and image forming apparatus - Google Patents

Description

The present invention relates to a sheet stacking device that stacks sheets, a sheet feeding device including the same, and an image forming apparatus.

In general, an image forming apparatus such as a printer is known in which a remaining amount display section is provided in a display window of a sheet feeding cassette so that the remaining amount of a sheet feeding cassette that stores sheets can be visually recognized from the outside. As such a device, an intermediate plate that can be raised and lowered according to the stacking amount of sheets, an arm that is rotatable in conjunction with the intermediate plate, and a remaining amount of sheets that is provided at the tip of the arm A sheet storage device including a display unit that displays is proposed (see Patent Document 1).

In addition, it is equipped with a remaining amount marker that can be contacted with the middle plate and displays the remaining amount of the sheet. A paper feeding device has been proposed in which the display of the above is changed (see Patent Document 2).

JP, 10-245139, A JP, 2008-195479, A

As in the devices described in Patent Documents 1 and 2, in the configuration in which the intermediate plate is biased toward the feeding roller by the spring and the sheet stacked on the intermediate plate and the feeding roller are brought into pressure contact with each other, the sheet feeding cassette is When pulling out, many lock the middle plate while pushing it down against the spring. When the middle plate is locked or unlocked, the middle plate is pushed down below the position (full paper position) or the locked position of the middle plate in the full paper state.

The sheet storage device described in Patent Document 1 is configured such that when the middle plate descends, the display unit rises via the arm. If the paper is full, the display should ideally be located at the uppermost position of the display window provided on the paper feed cassette, but the middle plate should be moved from the full or locked position to lock or unlock. In order to push down, it is necessary to provide a gap between the display window and the display section. As a result, the user may look at the gap between the display window and the display section and misunderstand that more sheets can be stacked, and there is a risk that the sheets may be overloaded in the paper feed cassette.

According to the present invention, in a sheet stacking apparatus, there is provided a stacking section on which sheets are stacked, the stacking means is provided so as to be drawn out from the apparatus main body, a biasing member that biases the stacking section upward, In a state where the loading means is pulled out from the apparatus main body, a holding means for holding the loading section at the first position and an urging force of the urging member according to an operation of mounting the loading means on the apparatus body. Against the above, the stacking unit is pushed down to a second position below the first position to release the holding of the stacking unit by the holding unit, and the amount of sheets stacked on the stacking unit. a display unit for displaying, the display unit so as to synchronize with the lifting of the loading unit, and a rotating portion that rotates, the rotator, the said releasing means is the stacking unit first It is characterized in that it has an elastic portion that elastically deforms so as not to rotate the rotating portion when it is pushed down from the 1 position to the second position.

According to the present invention, it is possible to prevent the overloading of the sheet over and.

1 is an overall schematic view showing a printer according to a first embodiment of the present invention. The whole perspective view which shows a cassette. It is a figure explaining movement of a middle board at the time of inserting/removing a cassette, (a) is a state where a cassette is attached to a device body, (b) is just before a cassette is pulled out halfway and a middle board is locked. (C) shows the state where the cassette is pulled out to the end. It is a figure which shows the moving relationship of a middle board and a display part, (a) is a state where a middle board is in a 1st position, (b) is a state where a middle board is in a 2nd position, (c) is a middle board. Shows the state where the seats are full. It is a figure which shows the intermediate|middle board which concerns on 2nd Embodiment, and the moving relation of a display part, (a) is a state with the predetermined amount of sheets stacked|stacked on an intermediate|middle board, (b) is an intermediate|middle board in 1st position. A certain state, (c) shows a state where the middle plate is in the second position, and (d) shows a state where the middle plate is full of sheets.

First, a first embodiment of the present invention will be described. The printer 1 (image forming apparatus) according to the first embodiment is an electrophotographic laser beam printer. As shown in FIG. 1, the printer 1 includes a cassette 10 (sheet stacking device) that stores sheets, a feeding unit 60 that feeds the sheets stored in the cassette 10, and an image forming unit that forms an image on the sheets. 70 and a fixing unit 80.

The image forming unit 70 (image forming unit) includes a laser scanner 71, a photosensitive drum 72, a developing roller 73, and a charging roller 74. When the image forming command is output to the printer 1, the image forming process by the image forming unit 70 is started based on the image information input from an external computer or the like connected to the printer 1. The laser scanner 71 irradiates the photosensitive drum 72 with laser light based on the input image information. At this time, the photoconductor drum 72 is previously charged by the charging roller 74, and an electrostatic latent image is formed on the photoconductor drum 72 by being irradiated with laser light. Thereafter, the electrostatic latent image is developed by the developing roller 73, and a toner image is formed on the photosensitive drum 72.

In parallel with the above-described image forming operation, the sheets S stacked on the cassette 10 are fed by the feeding unit 60. At this time, the middle plate 12 on which the sheets S are stacked is urged upward by the coil spring 13, and the leading end of the sheets S stacked on the middle plate 12 comes into pressure contact (contact) with the feeding roller 61. .. The feeding roller 61 is controlled so as to rotate clockwise only during feeding, and the sheets S are separated and fed one by one by the feeding roller 61 and the separation pad 62 of the feeding unit 60. The fed sheet S is conveyed to the registration unit 92. The cassette 10 and the feeding unit 60 constitute a sheet feeding device 65.

The registration unit 92 forms a loop on the sheet S to correct skew, and conveys the sheet S toward the transfer nip N formed by the photosensitive drum 72 and the transfer roller 75 at a predetermined conveyance timing. The toner image formed on the photosensitive drum 72 is transferred to the sheet S by applying a transfer bias from the transfer roller 75 at the transfer nip N. The sheet S on which the toner image is transferred is conveyed to the fixing unit 80 by the conveying belt 91, the toner image is fixed by the heating roller 81 and the pressure roller 82 of the fixing unit 80, and the sheet S is discharged onto the discharge tray 94 by the discharge roller pair 93. Is discharged to.

As shown in FIGS. 1 and 2, the cassette 10 is rotatably supported by a cassette main body 11 (stacking means) that stores sheets and a rotary shaft 14 of the cassette main body 11, and the sheets S are stacked therein. And a plate 12 (loading section). The cassette 10 includes a coil spring 13 (biasing member) that is an elastic member that biases the intermediate plate 12 upward toward the feeding roller 61, and a width direction and a rear end of the sheets stacked on the intermediate plate 12. The width regulating members 15 and 16 and the rear end regulating member 17 for regulating

Further, the cassette 10 has holding members 18 and 18 (holding means) that hold the intermediate plate 12 by contacting the intermediate plate arms 12a and 12a that are integrally formed with the intermediate plate 12 and extend in the width direction of the sheet. Interlocking means 50 (see FIG. 4) described later is included. The intermediate plate arms 12a and 12a may be provided separately from the intermediate plate 12. The cassette 10 is mounted in the apparatus main body 1A of the printer 1 by being moved in the arrow F direction. In addition, a handle (not shown) is provided on one side surface 11a (exterior surface) of the cassette body 11, and the user can grasp the handle and pull out the cassette 10 in the direction opposite to the arrow F direction.

Next, the movement of the intermediate plate 12 when the cassette 10 is pulled out and when the cassette 10 is mounted will be described with reference to FIG. 3A is a state in which the cassette is attached to the apparatus main body, FIG. 3B is a state in which the cassette is pulled out halfway and the intermediate plate is locked, and FIG. 3C is a state in which the cassette is pulled out to the end. Shows the removed state. Further, the intermediate plate 12 is located at the first position in FIG. 3(c) and located at the second position in FIG. 3(b). In addition, although the middle plate arms 12a and 12a of the middle plate 12 are locked by the holding members 18 and 18 provided at both ends of the middle plate 12, only one holding member 18 and one middle plate arm 12a will be described. The description of the other side is omitted.

The holding member 18 is rotatably provided with respect to the cassette body 11, and has a protrusion 18a and a holding surface 18b capable of holding the middle plate arm 12a. The holding member 18 is biased to the holding position (the position shown in FIGS. 3B and 3C) by the biasing spring 19 (holding biasing member) shown in FIG. When pressed, it is movable to the release position (the position shown in FIG. 3A). As shown in FIG. 3C, the middle plate 12 is held at the first position by holding the middle plate arm 12a by the holding surface 18b of the holding member 18 located at the holding position. The holding member 18 and the biasing spring 19 form a holding means 40.

A first release section 3 and a second release section 4 are formed at a position where the cassette 10 is inserted and removed in the apparatus body 1A of the printer 1, and the first release section 3 is a first guide that inclines downward. The surface 3a and the second guide surface 3b form a mountain (substantially triangular shape). The second releasing portion 4 is formed so as to be able to press the protruding portion 18a of the holding member 18, and when the cassette 10 is attached to the apparatus main body 1A, the holding member 18 is urged by the second releasing portion 4 to urge the spring 19. It is pressed against and is held at the release position. The first releasing unit 3 and the second releasing unit 4 form a releasing means 5.

When the cassette 10 is pulled out from the apparatus body 1A in the direction of the arrow G, the middle plate arm 12a of the middle plate 12 is moved to the first guide surface 3a of the first releasing portion 3 as shown in FIGS. It is guided downward by the (guide surface). Further, the protrusion 18a of the holding member 18 slides on the second releasing portion 4 while maintaining the releasing position.

Then, when the cassette 10 is further pulled out, as shown in FIG. 3B, the middle plate arm 12a comes into contact with the lower end of the first guide surface 3a (or the second guide surface 3b), and the middle plate 12 moves from the first position. Is also located at the second position, which is below the distance d. At this time, the second releasing portion 4 is separated from the protruding portion 18a of the holding member 18, and the holding member 18 is moved to the holding position by the biasing spring 19. When the holding member 18 moves from the release position to the holding position, the holding member 18 rotates without interfering with the middle plate arm 12a because there is a gap between the holding surface 18b and the middle plate arm 12a by the distance d. be able to. The holding surface 18b of the holding member 18 located at the holding position faces the middle plate arm 12a of the middle plate 12.

When the cassette 10 is further pulled out, as shown in FIG. 3C, the middle plate arm 12a is biased upward by the coil spring 13 and guided by the second guide surface 3b, so that the middle plate arm 12a is held. The intermediate plate 12 is held in the first position by coming into contact with the holding surface 18b of the plate 18.

On the other hand, while the cassette 10 is being mounted toward the apparatus main body 1A in the direction opposite to the arrow G, as shown in FIGS. The guide surface 3b moves downward, and the middle plate 12 moves from the first position to the second position. When the cassette 10 is further inserted toward the apparatus main body 1A, the second releasing portion 4 presses the protrusion 18a of the holding member 18 against the urging force of the urging spring 19 to release the holding member 18 from the holding position. Move to position. At this time, since there is a gap between the holding surface 18b and the middle plate arm 12a by the distance d, the holding member 18 can rotate without interfering with the middle plate arm 12a.

That is, the releasing means 5 holds the intermediate plate 12 after pushing it down to the second position below the first position against the biasing force of the coil spring 13 in accordance with the operation of mounting the cassette 10 on the apparatus main body 1A. The holding of the intermediate plate 12 by the means 40 is released.

When the holding member 18 moves to the release position, the middle plate arm 12a is unlocked, and when the cassette 10 is further inserted, the middle plate arm 12a is biased upward by the coil spring 13 and the first guide surface 3a. It is guided by and moves upward. As a result, the intermediate plate 12 rises as shown in FIG. 3A, and the sheets S stacked on the intermediate plate 12 come into pressure contact with the feeding roller 61.

Next, the configuration and operation of the interlocking device 50 will be described with reference to FIG. The interlocking unit 50 engages with a rotation arm 33 that is rotatably supported by the cassette body 11 about a rotation shaft 32 and a guide groove 20 formed in the cassette body 11, and is movable up and down on the cassette body 11. And a moving member 31 supported by. The rotating arm 33 has one end branched into a Y shape and has a first contact portion 33a that contacts the lower surface (lower side) of the middle plate 12 and a second contact that contacts the upper surface (upper side) of the middle plate 12. And a portion 33b are formed. The intermediate plate 12 is provided so as to project between the first contact portion 33a and the second contact portion 33b.

A notch 35 is formed at the base end portion of the first contact portion 33a, and an elastic portion 33c (restricting means) that is thin and elastically deformable by the notch 35 is integrated with the rotating arm 33. Has been formed. On the other end of the rotating arm 33 with the rotating shaft 32 sandwiched between the first contact portion 33a and the second contact portion 33b, a third contact capable of contacting the rib 31b of the moving member 31. The portion 33d is formed. In addition, in the present embodiment, the entire rotating arm 33 is made of an elastic material, but only the elastic portion 33c may be made of an elastic material.

The moving member 31 has a display portion 31a penetrating a through hole 11b formed in the one side surface 11a of the cassette body 11 and a rib 31b. The moving member 31 moves up and down in conjunction with the rotation of the rotating arm 33, as the third contact portion 33d contacts the rib 31b as the rotating arm 33 rotates. More specifically, the moving member 31 rises via the rotating arm 33 when the intermediate plate 12 descends, and descends via the rotating arm 33 when the intermediate plate 12 rises. The display portion 31a penetrates the through hole 11b and is formed flush with the one side surface 11a of the cassette body 11, and has a good appearance.

Next, the operation of the interlocking means 50 will be described. As shown in FIG. 4A, when the cassette 10 is pulled out from the apparatus main body 1A, the intermediate plate 12 is held by the holding means 40 at the first position as described above. At this time, the upper end of the moving member 31 contacts the stopper 11c formed on the cassette body 11 to position the uppermost position of the display unit 31a. At this time, the gap G1 between the upper edge (end edge) of the through hole 11b and the upper surface of the display section 31a is almost empty.

In the process of mounting the cassette 10 on the apparatus main body 1A, the intermediate plate 12 moves to the second position below the first position as described above. At this time, as shown in FIG. 4B, when the intermediate plate 12 moves from the first position to the second position, the first contact portion 33a of the rotating arm 33 is pressed downward by the lower surface of the intermediate plate 12. It Then, a rotational moment that presses the moving member 31 upward is generated in the rotating arm 33, but the stopper 11c restricts the upward movement of the moving member 31, and the elastic portion 33c formed thinly. The stress is concentrated and the elastic portion 33c is elastically deformed. That is, the movement of the intermediate plate 12 is absorbed by the elastic portion 33c so as not to be transmitted to the display portion 31a. As a result, the gap G2 between the upper edge (end edge) of the through hole 11b and the upper surface of the display unit 31a is equal to the gap G1 (G1=G2).

The position of the middle plate 12 when the cassette 10 is attached to the apparatus main body 1A and the middle plate 12 is full of sheets is as shown in FIG. 4(c). Is slightly above. Therefore, for example, when the cassette 10 is mounted on the apparatus main body 1A with the intermediate plate 12 fully loaded with the sheets S, the intermediate plate 12 moves slightly upward from the first position. 31 moves slightly. Therefore, the gap G3 between the upper edge (end edge) of the through hole 11b and the upper surface of the display unit 31a at this time is slightly wider than the gap G1 or the gap G2 (G3=G1+δa).

The movement of the display unit 31a has been described by taking the case where the cassette 10 is mounted (inserted) in the apparatus main body 1A as an example. However, when the cassette 10 is pulled out from the apparatus main body 1A, the intermediate plate 12 is in the first position. To move to the second position downwards. At this time, the elastic portion 33c is elastically deformed so that the display portion 31a does not move.

Assuming that the elastic portion 33c is not provided, when the intermediate plate moves downward from the first position to the second position, the display portion 31a moves upward via the rotating arm 33. Therefore, the gap between the through hole 11b and the upper surface of the display unit 31a must be opened by the amount of the movement of the display unit 31a upward. Then, this gap becomes wide, and there is a risk that the user may misunderstand that more sheets can be stacked even though the cassette 10 is full of sheets, resulting in overloading.

Therefore, in this embodiment, the elastic portion 33c is provided on the rotating arm 33 so that the display portion 31a does not move when the intermediate plate 12 is at the first position and at the second position. As a result, the gap G1 and the gap G2 can be made almost zero, and it is possible to prevent the sheets from being overloaded. Further, since the display unit 31a is interlocked with the middle plate 12 via the rotating arm 33 except when the middle plate 12 is moved downward from the first position to the second position, the remaining amount of the sheet from the fully loaded state is reduced. The sheet amount in the cassette 10 can be continuously recognized until it becomes zero.

In addition, in this Embodiment, although the elastic part 33c was formed in the base end part of the 1st contact part 33a, it is not limited to this and the elastic part should just be formed in somewhere in the interlocking means 50. For example, an elastic portion that elastically deforms when the intermediate plate 12 moves from the first position to the second position may be provided on the third contact portion 33d side of the rotating arm 33, and the rib 31b of the moving member 31 may be provided. It may be provided.

In addition, in the present embodiment, the rotating arm 33 and the moving member 31 are composed of separate members, but they may be composed of one member. Further, the rotating arm 33 may be configured to be slidable in the vertical direction without rotating about the rotating shaft 32.

Further, in the present embodiment, the through hole 11b through which the display unit 31a penetrates is provided on one side surface of the cassette body 11 on the upstream side in the sheet feeding direction, but the present invention is not limited to this. For example, the interlocking means 50 may be arranged so as to extend in the direction orthogonal to the feeding direction, and the through hole may be formed in the cassette body 11 in the direction orthogonal to the sheet feeding direction. At this time, the downstream end side of the intermediate plate 12 in the feeding direction projects between the first contact portion 33a and the second contact portion 33b of the rotating arm 33.

Next, a second embodiment of the present invention will be described. The second embodiment is a modification of the configuration of the interlocking means of the first embodiment, and is the same as the first embodiment. The configuration will be described by omitting illustration or by attaching the same reference numerals to the drawings.

The cassette 100 (sheet stacking apparatus) according to the second embodiment of the present invention has an interlocking unit 150. As shown in FIG. 5A, the interlocking means 150 includes a rotating arm 133 which is supported by the cassette body 11 so as to be rotatable about a rotating shaft 132, and a guide groove 20 formed in the cassette body 11. And a moving member 131 that is supported by the cassette body 11 so as to be vertically movable. Note that FIG. 5A shows a state in which the cassette 100 is mounted on the apparatus main body 1A and a predetermined amount of sheets are stacked on the intermediate plate 12. The rotating arm 133 (rotating member) has one end branched into a Y-shape, and has a first contact portion 133a that contacts the lower surface of the middle plate 12 and a second contact portion 133b that contacts the upper surface of the middle plate 12. And are formed. The intermediate plate 12 is provided so as to project between the first contact portion 133a and the second contact portion 133b.

A fan shape capable of abutting on the ribs 131b and 131d of the moving member 131 on the other end side of the rotating arm 133 with the rotating shaft 132 sandwiched between the first contact portion 133a and the second contact portion 133b. The portion 133d is formed. The fan-shaped portion 133d has an arc surface 133e centered on the rotation shaft 132.

The moving member 131 has a display portion 131a penetrating a through hole 11b formed in the one side surface 11a of the cassette body 11 and ribs 131b and 131d. The moving member 131 moves up and down in conjunction with the rotation of the rotating arm 133 by the fan-shaped portion 133d contacting the ribs 131b and 131d as the rotating arm 133 rotates. More specifically, the moving member 131 rises via the rotating arm 133 when the middle plate 12 descends, and descends via the rotating arm 133 when the middle plate 12 rises. The display portion 131a penetrates the through hole 11b and is formed flush with the one side surface 11a of the cassette body 11, and has a good appearance.

Next, the operation of the interlocking means 150 will be described. As shown in FIG. 5B, when the cassette 100 is pulled out from the apparatus main body 1A, the intermediate plate 12 is held by the holding means 40 in the first position as described above. At this time, the circular arc surface 133e of the fan-shaped portion 133d is in contact with the end portion 131c of the rib 131b, and the uppermost position of the display portion 31a is positioned. At this time, the gap g1 between the upper edge (edge) of the through hole 11b and the upper surface of the display unit 131a is almost empty.

In the process of mounting the cassette 100 on the apparatus main body 1A, the intermediate plate 12 moves to the second position below the first position as described above. At this time, as shown in FIG. 5C, when the intermediate plate 12 moves from the first position to the second position, the first contact portion 33a of the rotating arm 33 is pressed downward, and the fan-shaped portion 133d. Rotates upward (counterclockwise). However, since the arcuate surface 133e of the fan-shaped portion 133d and the end 131c of the rib 131b are in contact with each other, the end 131c slides on the arcuate surface 133e and the moving member 131 does not move in the vertical direction.

That is, the movement of the middle plate 12 is absorbed by the absorbing means configured by the arc surface 133e and the rib 131b (sliding portion) so as not to be transmitted to the display portion 131a. As a result, the gap g2 between the upper edge (edge) of the through hole 11b and the upper surface of the display unit 31a is equal to the gap g1 (g1=g2).

The position of the middle plate 12 when the cassette 100 is attached to the apparatus main body 1A and the middle plate 12 is full of sheets is as shown in FIG. 5(d). Is slightly above. Therefore, for example, when the intermediate plate 12 is fully loaded with the sheets S and the cassette 100 is attached to the apparatus main body 1A, the intermediate plate 12 moves slightly upward from the first position, so that the fan-shaped portion 133d of the rotating arm 133 is formed. Moves slightly downward (clockwise). At this time, the end 131c of the rib 131b is still in contact with the circular arc surface 133e of the fan-shaped portion 133d. Therefore, the gap g3 between the upper edge (end edge) of the through hole 11b and the upper surface of the display unit 31a at this time is equal to the gap g1 and the gap g2 (g3=g1=g2).

Note that the movement of the display unit 131a has been described by taking the case where the cassette 100 is mounted (inserted) in the apparatus body 1A as an example, but the middle plate 12 is also in the first position when the cassette 100 is pulled out from the apparatus body 1A. To move to the second position downwards. At this time, the end 131c of the rib 131b formed on the moving member 131 slides on the circular arc surface 133e of the fan-shaped portion 133d formed on the rotating arm 133, so that the display 131a does not move. is there.

As described above, according to the present embodiment, the position of the display unit 131a is the same not only in the first position and the second position of the intermediate plate 12 but also in the position when the sheets are full. As a result, the gap g1, the gap g2, and the gap g3 can be set to almost zero, and the sheets can be prevented from being overloaded.

1: image forming apparatus (printer), 1A: apparatus main body, 3: first release section, 3a: guide surface (first guide surface), 4: second release section, 5: release means 10, 100: sheet stacking Device (cassette), 11: loading means (cassette body), 11a: exterior surface (one side surface), 11b: through hole, 11c: restricting portion (stopper), 12: loading portion (middle plate), 13: biasing member (Coil spring), 18: holding member, 18b: holding surface, 19: holding urging member (urging spring), 131: moving member, 31a, 131a: display portion, 33a: first contact portion, 33b: first 2 contact portions, 33c: regulating means (elastic portion), 40: holding means, 50, 150: interlocking means, 65: sheet feeding device, 70: image forming means, 131: moving member, 131b: regulating means (sliding means) Moving part, rib), 132: rotating shaft, 133: rotating member (rotating arm), 133e: regulating means (arc surface), G1, G2, g1, g2: gap, S: sheet

Claims (15)

A stacking unit that has a stacking unit for stacking sheets, and is provided so as to be able to be drawn out from the apparatus main body;
A biasing member that biases the stacking portion upward,
Holding means for holding the stacking section at a first position in a state where the stacking means is pulled out from the apparatus main body;
According to the operation of mounting the stacking unit on the apparatus main body, the stacking unit is pushed down to the second position lower than the first position against the biasing force of the biasing member, and the stacking unit performs the stacking. Release means for releasing the holding of the section,
A display unit for displaying the amount of sheets stacked on the stacking unit;
A rotating unit that rotates so as to interlock the display unit with the lifting and lowering of the stacking unit;
The rotating part has an elastic part that elastically deforms so as not to rotate the rotating part when the releasing means pushes down the stacking part from the first position to the second position.
A sheet stacking device characterized by the above. The rotating portion has a first contact portion that contacts the lower side of the stacking portion, and a second contact portion that contacts the upper side of the stacking portion,
The elastic portion is elastically deformed by the lower side of the loading portion pressing the first contact portion when the loading portion moves from the first position toward the second position,
The sheet stacking device according to claim 1, wherein: The stacking unit has a bottom plate disposed below the stacking unit,
The elastic portion is elastically deformed by pressing the first contact portion toward the bottom plate by the lower side of the loading portion when the loading portion moves from the first position to the second position. To do
The sheet stacking device according to claim 2, wherein: The elastic portion is provided at a base end portion of the first contact portion,
The sheet stacking apparatus according to claim 2, wherein the sheet stacking apparatus is a sheet stacking apparatus. The elastic portion is a thin portion that is thinner than the base end portion of the second contact portion.
The sheet stacking device according to claim 4, wherein: The second contact portion of the rotating portion links the display portion with the stacking portion when the stacking portion moves from the first position to a third position above the first position. And move continuously,
The sheet stacking device according to claim 2, wherein the sheet stacking device is a sheet stacking device. A moving member that has the display unit and is movable by being pressed by the rotating unit;
The stacking unit has a restricting unit that restricts movement of the moving member when the stacking unit moves from the first position to the second position.
7. The sheet stacking device according to claim 1, wherein the sheet stacking device is a sheet stacking device. The stacking unit has a through hole through which the display unit penetrates,
The sheet stacking apparatus according to claim 1, wherein the sheet stacking apparatus is a sheet stacking apparatus. The display unit is formed flush with the exterior surface of the stacking unit,
The sheet stacking apparatus according to claim 1, wherein the sheet stacking apparatus is a sheet stacking apparatus. A position of the stacking unit in a state where the stacking unit is attached to the apparatus main body and sheets are fully loaded is higher than the first position.
The sheet stacking apparatus according to claim 1, wherein the sheet stacking apparatus is a sheet stacking apparatus. The holding means has a holding surface capable of holding the stacking unit, and is rotatably supported, and the holding member at a position capable of holding the stacking unit located at the first position. A holding urging member for urging,
The sheet stacking apparatus according to claim 1, wherein the sheet stacking apparatus is a sheet stacking apparatus. Said releasing means, when said loading means is mounted on the apparatus main body, a first release portion for pushing down the loading unit against the urging force of the pre-Symbol urging member to the second position, with the holding A second release portion for rotating the holding member against the biasing force of the biasing member,
The sheet stacking device according to claim 11, wherein: The first release section has a guide surface that guides the stacking section toward the second position when the stacking unit is pulled out from the apparatus main body.
The sheet stacking device according to claim 12, wherein A sheet stacking device according to any one of claims 1 to 13,
A feeding roller configured to feed the sheets stacked on the stacking unit,
The urging member urges the stacking unit upward so that the sheets stacked on the stacking unit come into contact with the feeding roller,
When the stacking unit is pulled out from the apparatus main body, the stacking unit is lowered to the first position to release the contact between the sheet stacked on the stacking unit and the feeding roller.
A sheet feeding device characterized by the above. A sheet feeding device according to claim 14;
Image forming means for forming an image on a sheet fed from the sheet feeding device,
An image forming apparatus characterized by the above.

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