JP2019116390A - Sheet loading device, sheet feeding device, and image formation apparatus - Google Patents

Abstract

To provide a sheet loading device which allows a user to continuously recognize an amount of sheets stored in loading means and prevents overloading, a sheet feeding device, and an image formation apparatus.SOLUTION: A sheet loading device comprises: holding means which holds an intermediate plate 12 (loading part) at a first position in the state where a cassette body 11 (loading means) is withdrawn from a device body; release means which releases holding of the intermediate plate 12 by the holding means by pressing the intermediate plate 12 down to a second position lower than the first position against an energization force of a coil spring (energization member) when the cassette body 11 is attached to the device body; and linkage means 50 which has a display part 31a for displaying the position of the intermediate plate 12 and is linked with ascending/descending of the intermediate plate 12. The linkage means 50 has an elastic part 33c (absorption means) which regulates the display part 31a so as not to change the position of the display part 31a when the intermediate plate 12 is pressed down from the first position to the second position.SELECTED DRAWING: Figure 4

Description

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

  Generally, there is known an image forming apparatus such as a printer provided with a remaining amount display unit in a display window of a sheet feeding cassette so that the remaining amount of the sheet feeding cassette for storing sheets can be visually recognized from the outside. As such an apparatus, a middle plate provided movably up and down according to the loading amount of sheets, an arm rotatably provided interlockingly with the middle plate, and a tip end of the arm provided with the remaining amount of the sheet And a display unit for displaying a sheet storage device has been proposed (see Patent Document 1).

  In addition, it is provided with a remaining amount marker which is provided so as to be in contact with the middle plate and displays the remaining amount of the sheet, and after the middle plate rises a predetermined height from the full paper state, contacts the remaining amount marker. There has been proposed a sheet feeding apparatus in which the display of is changed (see Patent Document 2).

Japanese Patent Application Laid-Open No. 10-245139 JP 2008-195479 A

  As in the apparatuses described in Patent Documents 1 and 2, in the configuration in which the middle plate is biased toward the feeding roller by a spring and the sheet stacked on the middle plate is pressed against the feeding roller, the sheet feeding cassette is used. When pulling out, the inner plate is often locked in a state of being pushed down against the spring. Then, when the middle plate is locked or released, the middle plate is pushed down more than the position (full paper position) of the full-sized middle plate and the lock position.

  In the sheet storage device described in Patent Document 1, when the middle plate is lowered, the display unit is elevated via the arm. If the paper is full, it is ideal for the display unit to be positioned at the highest position of the display window provided in the paper feed cassette, but for locking or unlocking the middle plate from the full paper position or the lock position In order to push it down, it is necessary to provide a gap between the display window and the display unit. As a result, the user sees the gap between the display window and the display unit, and misunderstands that the sheet can be further stacked, and there is a possibility that the sheet may be overloaded on the sheet feeding cassette.

  Further, in the sheet feeding device described in Patent Document 2, the remaining amount marker is used until the predetermined number of sheets is reduced from the full sheet state to abut on the remaining amount marker only after the middle plate rises a predetermined height from the full sheet state. The display of will never change. Therefore, the user can not continuously recognize the amount of sheets stored in the sheet feeding cassette, and may not correctly recognize the remaining amount of sheets.

  Therefore, the present invention is configured to prevent the display unit from moving even when the stacking unit moves downward from the first position while being able to continuously recognize the remaining amount of the sheet, and the sheet that solves the problems described above An object of the present invention is to provide a loading device, a sheet feeding device, and an image forming apparatus.

  The present invention relates to a sheet stacking apparatus, comprising: a stacking unit on which sheets are stacked, and a stacking unit provided so as to be able to be pulled out with respect to an apparatus main body, an urging member biasing the stacking unit upward, In a state in which the loading unit is pulled out with respect to the apparatus main body, the biasing unit holds the loading unit at the first position, and the biasing force of the biasing member according to the operation of mounting the loading unit on the apparatus main body. Releasing means for pushing the loading unit to a second position below the first position to release the holding of the loading unit by the holding unit, and interlocking means linked to the elevation of the loading unit , And the interlocking means has an elastic portion that elastically deforms when the release means pushes the loading unit from the first position to the second position.

  Further, according to the present invention, in the sheet stacking apparatus, the sheet stacking apparatus includes a stacking unit on which the sheets are stacked, and a stacking unit provided to be able to be drawn out with respect to the apparatus main body, and a biasing member that biases the stacking unit upward. And holding means for holding the loading unit in the first position in a state where the loading means is pulled out with respect to the apparatus main body, and the biasing member according to an operation in which the loading means is mounted on the apparatus main body. Release means for pressing the loading unit against the biasing force to a second position below the first position to release the loading unit from the holding unit, and a sheet loaded on the loading unit And an interlocking unit interlocking with the elevation of the loading unit, the interlocking unit setting the loading unit from the first position to the second position. When pressing down, Having a regulating means for regulating the display unit so that location does not change, characterized in that.

  According to the present invention, when moving the loading unit from the first position held by the holding unit to the second position below the first position, the loading unit and the display unit are not interlocked. Therefore, even if the loading unit is at the first position, it is not necessary to provide a gap between, for example, the display unit and the through hole through which the display unit passes, and it is possible to prevent the sheet from being overloaded.

FIG. 1 is an overall schematic view showing a printer according to a first embodiment of the present invention. The whole perspective view showing a cassette. It is a figure explaining the motion of the middle plate at the time of inserting and removing a cassette, and (a) is a state where the cassette is attached to the apparatus main body, (b) is just before the cassette is pulled out halfway and the middle plate is locked. The state of (c) shows the state in which the cassette is completely pulled out. It is a figure showing the movement relation of a middle board and a display part, and (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 Indicates that the seat is full. It is a figure which shows the movement relation of a middle plate and a display part concerning a 2nd embodiment, and (a) is a state where sheets of predetermined amount were loaded on the middle plate, (b) is a middle plate in the 1st position. In a certain state, (c) shows a state in which the middle plate is at the second position, and (d) shows a state in which 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) for storing sheets, a feeding unit 60 for feeding sheets stored in the cassette 10, and an image forming unit for forming an image on a sheet 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 an image formation command is output to the printer 1, an image forming process by the image forming unit 70 is started based on image information input from an external computer or the like connected to the printer 1. The laser scanner 71 irradiates laser light toward the photosensitive drum 72 based on the input image information. At this time, the photosensitive drum 72 is previously charged by the charging roller 74, and an electrostatic latent image is formed on the photosensitive drum 72 by being irradiated with the 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 sheet S stacked on the cassette 10 is 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 is in pressure contact (contact) with the feeding roller 61. . The feeding roller 61 is controlled 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. A sheet feeding device 65 is configured by the cassette 10 and the feeding unit 60.

  The registration unit 92 forms a loop on the sheet S to correct skew, and conveys the sheet S toward a 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 onto 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 has been transferred is conveyed to the fixing unit 80 by the conveyance belt 91, and the toner image is fixed by the heating roller 81 and the pressure roller 82 of the fixing unit 80. Discharged into

  As shown in FIGS. 1 and 2, the cassette 10 is rotatably supported by the cassette main body 11 (loading means) for storing sheets and the pivot shaft 14 of the cassette main body 11, and the sheets S are being loaded. And a plate 12 (loading unit). Further, the cassette 10 includes a coil spring 13 (biasing member), which is an elastic member that biases the middle plate 12 upward toward the feeding roller 61, and a width direction and a rear end of a sheet stacked on the middle plate 12. And the rear end regulating member 17.

  Further, the cassette 10 is formed integrally with the middle plate 12 and is held in contact with the middle plate arms 12a and 12a extending in the width direction of the sheet to hold the middle plate 12 (holding means) 18; And interlocking means 50 (see FIG. 4) described later. The middle plate arms 12 a and 12 a may be provided separately from the middle plate 12. The cassette 10 is mounted on the apparatus main body 1A of the printer 1 by being moved in the direction of the arrow F. Further, a handle (not shown) is provided on one side surface 11a (the exterior surface) of the cassette body 11, and the user can hold the handle and pull out the cassette 10 in the direction opposite to the arrow F direction.

  Next, with reference to FIG. 3, the movement of the middle plate 12 when the cassette 10 is pulled out and mounted will be described. 3 (a) shows the state in which the cassette is attached to the main body of the apparatus, FIG. 3 (b) shows the state immediately before the cassette is pulled out and the middle plate is locked, FIG. 3 (c) shows the cassette drawn to the end Indicated removed. The middle plate 12 is located at the first position in FIG. 3 (c) and at the second position in FIG. 3 (b). Although the middle plate arms 12a and 12a of the middle plate 12 are locked by the holding members 18 and 18 provided on both ends of the middle plate 12, only one holding member 18 and one middle plate arm 12a will be described, The explanation of the other side is omitted.

  The holding member 18 is provided rotatably with respect to the cassette main 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 urged to the holding position (the position shown in FIGS. 3B and 3C) by the urging spring 19 (holding and urging member) shown in FIG. It is configured to be movable to the release position (the position shown in FIG. 3A) by being pressed. 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 positioned at the holding position, as shown in FIG. 3 (c). A holding means 40 is constituted by the holding member 18 and the biasing spring 19.

  A first release unit 3 and a second release unit 4 are formed in the apparatus main body 1A of the printer 1 at positions where the cassette 10 is inserted and removed, and the first release unit 3 is a first guide that inclines downward. The surface 3a and the second guide surface 3b are formed in a mountain shape (substantially triangular shape). The second release portion 4 is formed to be able to press the protrusion 18 a of the holding member 18, and the holding member 18 is biased by the second release portion 4 in a state where the cassette 10 is attached to the apparatus main body 1A. Is pressed against and held in the release position. The first releasing unit 3 and the second releasing unit 4 constitute a releasing means 5.

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

  When the cassette 10 is further pulled out, as shown in FIG. 3B, the middle plate arm 12a abuts on the lower end of the first guide surface 3a (or the second guide surface 3b), and the middle plate 12 starts from the first position. Is also located at the second position below the distance d. At this time, the second release portion 4 is separated from the protrusion 18 a 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 of the distance d between the holding surface 18b and the middle plate arm 12a. be able to. The holding surface 18 b of the holding member 18 positioned at the holding position faces the middle plate arm 12 a of the middle plate 12.

  When the cassette 10 is further withdrawn, as shown in FIG. 3C, the middle plate arm 12a is urged upward by the coil spring 13 and guided by the second guide surface 3b, and the middle plate arm 12a is a holding member The middle plate 12 is held at the first position while being in contact with the 18 holding surfaces 18b.

  On the other hand, while the cassette 10 is mounted toward the main assembly 1A in the direction opposite to the arrow G, as shown in FIGS. 3 (c) and 3 (b), the middle plate arm 12a is the second of the first release portion 3. It moves downward by the guide surface 3b, and the mid plate 12 moves from the first position to the second position. Further, when the cassette 10 is inserted toward the apparatus main assembly 1A, the second release portion 4 presses the projection 18a of the holding member 18 against the biasing force of the biasing spring 19, and the holding member 18 is released from the holding position. Move to position. At this time, since there is a gap of the distance d between the holding surface 18b and the middle plate arm 12a, the holding member 18 can be rotated without interfering with the middle plate arm 12a.

  That is, the releasing means 5 holds the inner plate 12 against the biasing force of the coil spring 13 in the second position below the first position in accordance with the operation of mounting the cassette 10 in the apparatus body 1A. The holding of the middle plate 12 by the means 40 is released.

  When the holding member 18 moves to the release position, the lock of the middle plate arm 12a is released, and the cassette 10 is further inserted, the middle plate arm 12a is urged upward by the coil spring 13 and the first guide surface 3a. It is guided by and moves upward. As a result, the middle plate 12 ascends as shown in FIG. 3A, and the sheet S stacked on the middle plate 12 is brought into pressure contact with the feeding roller 61.

  Next, the configuration and operation of the interlocking means 50 will be described with reference to FIG. The interlocking means 50 engages with a pivoting arm 33 rotatably supported by the cassette main body 11 about a pivot shaft 32 and a guide groove 20 formed in the cassette main body 11 so that the cassette main body 11 can be moved up and down. And a movable member 31 supported by the The pivoting arm 33 is branched at one end side into a Y-shape, and a first contact portion 33 a 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. The portion 33 b is formed. The middle plate 12 is provided so as to protrude between the first contact portion 33a and the second contact portion 33b.

  A notch 35 is formed at the base end of the first contact portion 33 a, and the elastic portion 33 c (regulating means) that can be thin and elastically deformed by the notch 35 is integrally formed with the pivoting arm 33. It is formed. A third contact that can contact the rib 31b of the moving member 31 at the other end of the pivot arm 33 with respect to the first contact portion 33a and the second contact portion 33b with the pivot shaft 32 interposed therebetween. A portion 33d is formed. In the present embodiment, the entire pivoting arm 33 is formed of an elastic material, but only the elastic portion 33c may be formed of an elastic material.

  The moving member 31 has a display portion 31 a which penetrates a through hole 11 b formed in one side surface 11 a of the cassette main body 11 and a rib 31 b. The moving member 31 moves up and down in conjunction with the rotation of the rotation arm 33 by the third contact portion 33 d coming into contact with the rib 31 b as the rotation arm 33 rotates. More specifically, the moving member 31 ascends via the pivoting arm 33 when the middle plate 12 descends, and descends via the pivoting arm 33 when the middle plate 12 ascends. The display portion 31a is formed to be flush with the side surface 11a of the cassette body 11 by penetrating the through hole 11b, and the appearance is good.

  Next, the operation of the interlocking means 50 will be described. As shown in FIG. 4A, in the state where the cassette 10 is pulled out from the apparatus main body 1A, the middle 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 abuts on the stopper 11 c formed on the cassette body 11, and the uppermost position of the display portion 31 a 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 portion 31a is hardly vacant.

  In the process of attaching the cassette 10 to the apparatus main assembly 1A, as described above, the middle plate 12 is moved to the second position below the first position. At this time, as shown in FIG. 4B, when the middle plate 12 is moved from the first position to the second position, the first contact portion 33a of the pivot arm 33 is pressed downward by the lower surface of the middle plate 12. Ru. Then, a rotational moment is generated in the pivoting arm 33 so as to press the moving member 31 upward, but the upward movement of the moving member 31 is restricted by the stopper 11 c and the elastic portion 33 c formed thin. The stress is concentrated, and the elastic portion 33c is elastically deformed. That is, the movement of the middle plate 12 is absorbed by the elastic portion 33 c so as not to be transmitted to the display portion 31 a. Thus, the gap G2 between the upper edge (edge) of the through hole 11b and the upper surface of the display portion 31a is equal to the gap G1 (G1 = G2).

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

  The above-described movement of the display portion 31a has been described by taking the case where the cassette 10 is mounted (inserted) in the apparatus main body 1A as an example, but also when the cassette 10 is pulled out of the apparatus main body 1A Move downward to the second position. At this time, it goes without saying that the display portion 31a does not move due to elastic deformation of the elastic portion 33c.

  Assuming that the elastic portion 33c is not provided, when the middle plate moves downward from the first position to the second position, the display portion 31a moves upward via the pivot arm 33. Therefore, the gap between the through hole 11b and the upper surface of the display unit 31a has to be made as much as the display unit 31a moves upward. Then, even though the gap is wide and the sheets are fully loaded in the cassette 10, the user may misunderstand that the sheets can be further loaded, which may result in overloading.

  Therefore, in the present embodiment, an elastic portion 33c is provided on the pivoting arm 33 so that the display portion 31a does not move depending on whether the middle plate 12 is in the first position or in the second position. As a result, the gap G1 and the gap G2 can be made substantially zero, and sheets can be prevented from being overloaded. In addition, since the display unit 31a interlocks with the intermediate plate 12 via the pivot arm 33 except when the intermediate plate 12 moves downward from the first position to the second position, the sheet remaining amount is full from the full state. The sheet amount in the cassette 10 can be recognized continuously until it becomes zero.

  In the present embodiment, although the elastic portion 33c is formed at the base end of the first contact portion 33a, the present invention is not limited to this, and the elastic portion may be formed anywhere in the interlocking means 50. For example, an elastic portion that elastically deforms when the middle plate 12 moves from the first position to the second position may be provided on the third contact portion 33 d side of the rotating arm 33, and the rib 31 b of the moving member 31 is You may provide.

  Moreover, although the rotation arm 33 and the movement member 31 were comprised from another member in this Embodiment, you may comprise from one member. Further, the pivoting arm 33 may be configured to be slidable in the vertical direction without pivoting around the pivoting shaft 32.

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

  Next, the second embodiment of the present invention will be described. In the second embodiment, the configuration of the interlocking means of the first embodiment is changed, and the second embodiment is the same as the first embodiment. About the structure of, illustration is abbreviate | omitted or it attaches | subjects and demonstrates the same code | symbol to a figure.

  The cassette 100 (sheet stacking apparatus) according to the second embodiment of the present invention has an interlocking means 150. As shown in FIG. 5A, the interlocking means 150 includes a pivoting arm 133 pivotally supported by the cassette body 11 about a pivot shaft 132 and a guide groove 20 formed in the cassette body 11. And a movable member 131 which is engaged with and supported by the cassette main body 11 so as to be movable up and down. In FIG. 5A, the cassette 100 is attached to the apparatus main body 1A, and a predetermined amount of sheets are stacked on the middle plate 12. The pivoting arm 133 (the pivoting member) is branched at one end into a Y-shape, and 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 being formed. The middle plate 12 is provided so as to protrude between the first contact portion 133a and the second contact portion 133b.

  A sector shape that can contact the ribs 131b and 131d of the moving member 131 on the other end side of the turning arm 133 with respect to the first contact portion 133a and the second contact portion 133b with the turning shaft 132 interposed therebetween. A portion 133 d is formed. The fan-shaped portion 133 d has an arc surface 133 e centered on the pivot shaft 132.

  The moving member 131 has a display portion 131a penetrating through a through hole 11b formed in one side surface 11a of the cassette main body 11, and ribs 131b and 131d. The moving member 131 moves up and down in conjunction with the rotation of the pivoting arm 133 as the fan-shaped portion 133d abuts on the ribs 131b and 131d as the pivoting arm 133 pivots. More specifically, the moving member 131 is elevated via the pivoting arm 133 when the middle plate 12 is lowered, and is lowered via the pivoting arm 133 when the middle plate 12 is raised. The display portion 131a is formed to be flush with the side surface 11a of the cassette main body 11 through the through hole 11b, and the appearance is good.

  Next, the operation of the interlocking means 150 will be described. As shown in FIG. 5B, in the state where the cassette 100 is pulled out from the apparatus main body 1A, the middle plate 12 is held by the holding means 40 at the first position as described above. At this time, the 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 portion 131a is hardly vacant.

  In the process of attaching the cassette 100 to the apparatus main body 1A, as described above, the middle plate 12 is moved to the second position below the first position. At this time, as shown in FIG. 5C, when the middle plate 12 is moved from the first position to the second position, the first contact portion 33a of the pivot arm 33 is pressed downward, and the fan-shaped portion 133d Rotates upward (counterclockwise). However, since the arc 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 arc 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 of the arc surface 133 e and the rib 131 b (sliding portion) so as not to be transmitted to the display portion 131 a. Thus, the gap g2 between the upper edge (edge) of the through hole 11b and the upper surface of the display portion 31a is equal to the gap g1 (g1 = g2).

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

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

  As described above, according to the present embodiment, the positions of the display portions 131a are the same not only at the first position and the second position but also at positions when the sheets are full. As a result, the gap g1, the gap g2 and the gap g3 can be made substantially zero, and sheets can be prevented from being overloaded.

  1: image forming apparatus (printer), 1A: apparatus main body, 3: first release unit, 3a: guide surface (first guide surface), 4: second release unit, 5: release unit, 10, 100: sheet stacking Device (cassette) 11: loading means (cassette main body) 11a: exterior surface (one side) 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 biasing member (biasing spring), 131: moving member, 31a, 131a: display portion, 33a: first contact portion, 33b: first 2 contact portion, 33c: restricting means (elastic portion), 40: holding means, 50, 150: interlocking means, 65: sheet feeding device, 70: image forming means, 131: moving member, 131b: restricting means (sliding Moving part, rib), 132: rotation axis, 133: rotation member (rotation Over arm), 133e: regulating means (arc surface), G1, G2, g1, g2: clearance, S: sheet

Claims (15)

A loading unit having a loading unit on which sheets are loaded, and provided so as to be able to be pulled out with respect to the apparatus main body;
A biasing member for biasing the loading portion upward;
Holding means for holding the loading unit at a first position in a state where the loading means is pulled out with respect to the apparatus main body;
The loading unit is pushed down to the second position below the first position against the biasing force of the biasing member according to the operation of mounting the loading unit on the apparatus body, and the loading by the holding unit is performed. Release means for releasing the holding of the part;
Interlocking means interlockingly moving up and down the loading unit;
The interlocking unit has an elastic portion that elastically deforms when the release unit pushes the loading unit from the first position to the second position.
A sheet loading device characterized by The interlocking unit has a display unit for displaying the amount of sheets stacked on the stacking unit.
The sheet stacking apparatus according to claim 1, wherein the sheet is stacked. A loading unit having a loading unit on which sheets are loaded, and provided so as to be able to be pulled out with respect to the apparatus main body;
A biasing member for biasing the loading means upward;
Holding means for holding the loading unit at a first position in a state where the loading means is pulled out with respect to the apparatus main body;
The loading unit is pushed down to the second position below the first position against the biasing force of the biasing member according to the operation of mounting the loading unit on the apparatus body, and the loading by the holding unit is performed. Release means for releasing the holding of the part;
The display device includes a display unit for displaying the amount of sheets loaded on the loading unit, and interlocking means interlocking with lifting and lowering of the loading unit.
The interlocking unit has a control unit configured to control the display unit so that the position of the display unit does not change when the release unit pushes the loading unit from the first position to the second position.
A sheet loading device characterized by The restriction means is an elastic portion that elastically deforms when the loading portion moves from the first position to the second position.
The sheet stacking apparatus according to claim 3, wherein The interlocking means has a first contact portion that contacts the lower side of the loading portion, and a second contact portion that contacts the upper side of the loading portion,
The elastic portion elastically deforms when the lower side of the loading unit presses the first contact portion when the loading unit moves from the first position toward the second position.
The sheet stacking apparatus according to any one of claims 2 to 4, wherein the sheet is stacked. The loading unit includes a restricting unit that restricts the movement of the display unit when the loading unit moves from the first position toward the second position.
The sheet stacking apparatus according to any one of claims 2 to 5, wherein the sheet is stacked. The interlocking means is rotatably supported by the loading means, has a rotating member interlocked with the elevation of the loading unit, the display unit, and is movable by being pressed by the rotating member. , And
The restriction means includes an arc surface formed on the rotation member and centered on the rotation axis of the rotation member, and the arc surface when the loading unit moves from the first position to the second position. And a sliding portion sliding on the
The sheet stacking apparatus according to claim 3, wherein The loading means has a through hole through which the display unit passes,
The gap between the end edge of the through hole and the display unit does not change even if the loading unit moves from the first position to the second position.
The sheet stacking apparatus according to any one of claims 2 to 7, characterized in that The display unit is formed flush with the exterior surface of the loading means.
The sheet stacking apparatus according to any one of claims 2 to 8, wherein The position of the loading unit in a state in which the loading unit is mounted on the apparatus body and the sheets are full is located above the first position.
The sheet stacking apparatus according to any one of claims 1 to 9, wherein the sheet is stacked. The holding means has a holding surface capable of holding the loading unit, and a holding member rotatably supported and the holding member at a position capable of holding the loading unit positioned at the first position. And a holding and biasing member for biasing.
The sheet stacking apparatus according to any one of claims 1 to 10, wherein The releasing unit is configured to press the loading unit to a second position below the first position against the biasing force of the holding biasing member when the loading unit is mounted on the apparatus body. A release unit; and a second release unit configured to rotate the holding member against the biasing force of the holding and biasing member.
The sheet stacking apparatus according to claim 11, wherein the sheet is stacked. The first release unit has a guide surface for guiding the loading unit toward the second position when the loading unit is pulled out of the apparatus main body.
The sheet stacking apparatus according to claim 12, wherein the sheet is stacked. A sheet stacking apparatus according to any one of claims 1 to 13.
A feeding roller for feeding a sheet stacked on the loading unit;
The biasing member biases the stacking unit upward such that the sheet stacked on the stacking unit contacts the feeding roller.
The contact between the sheet stacked on the stacking unit and the feeding roller is released by lowering the stacking unit to the first position according to an operation in which the stacking unit is pulled out from the apparatus main body.
Sheet feeding apparatus characterized in that. A sheet stacking apparatus according to any one of claims 1 to 13.
An image forming unit configured to form an image on a sheet fed from the sheet stacking apparatus;
An image forming apparatus characterized by

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