Patent Application
20250074727
This application is based on and claims priority under 35 USC 119 from Japanese Patent Application No. 2023-139614 filed Aug. 30, 2023.
The present disclosure relates to a sheet feed device and an image forming apparatus.
In the related art, as technologies related to a sheet feed device, for example, technologies disclosed in Japanese Unexamined Patent Application Publication No. 2012-166912, Japanese Unexamined Patent Application Publication No. 9-77291, and the like have already been proposed.
In Japanese Unexamined Patent Application Publication No. 2012-166912, a guide member having a guide surface between a storage section and a nip between first and second rollers to nip a sheet, the guide surface guiding the sheet from the storage section toward the nip, is configured to have an enlarged portion in which a distance between the storage section and an end edge of the guide surface on a side of the nip gradually increases from an end portion of the guide surface on an upstream side in a pull-out direction toward the pull-out direction.
Japanese Unexamined Patent Application Publication No. 9-77291 discloses a configuration in which a protruding portion for preventing remaining sheets, which protrudes toward sheets, is provided in a side regulating member on a back side in a pull-out direction of a sheet feed tray, and the protruding portion is disposed higher than an uppermost surface of sheets during sheet feeding.
Aspects of non-limiting embodiments of the present disclosure relate to, in a case where an accommodating section that accommodates a recording medium is pulled out from a housing, preventing the recording medium from remaining inside the housing in comparison with a case where the recording medium comes into contact with a concave portion that is provided in a frame of the housing and is provided with a concave shape toward a sheet feeding direction of the recording medium on a front side in a pull-out direction in which the accommodating section is pulled out.
Aspects of certain non-limiting embodiments of the present disclosure overcome the above disadvantages and/or other disadvantages not described above. However, aspects of the non-limiting embodiments are not required to overcome the disadvantages described above, and aspects of the non-limiting embodiments of the present disclosure may not overcome any of the disadvantages described above.
According to an aspect of the present disclosure, there is provided a sheet feed device including an accommodating section that is provided so as to be pulled out in a pull-out direction intersecting a sheet feeding direction of a housing and that accommodates a recording medium; a concave portion that is provided with a concave shape toward the sheet feeding direction of the recording medium on a front side in the pull-out direction; and a protruding portion that is provided on the accommodating section side so that a member protrudes relative to the concave portion when the concave portion is viewed from the front side to a back side in the pull-out direction.
Exemplary embodiments of the present disclosure will be described in detail based on the following figures, wherein:
Hereinafter, modes for carrying out the present disclosure (hereinafter, referred to as “exemplary embodiment”) will be described with reference to the drawings.
An image forming apparatus 1 according to the first exemplary embodiment is configured as, for example, a color copier. The image forming apparatus 1 includes, at an upper end of an apparatus main body 1a, an image reading device 2 that reads an image of a document (not illustrated). The image forming apparatus 1 has a function of copying an image of a document read by the image reading device 2, and also a function as a color printer or the like that records image information sent from a host computer or the like (not illustrated).
The image forming apparatus 1 includes, inside the apparatus main body 1a, a plurality of image forming devices 10 that form toner images to be developed with toner configuring a developer 4, an intermediate transfer device 20 that holds the toner images formed by the image forming devices 10 and transports the toner images to a secondary transfer position where the toner images are finally secondarily transferred onto a recording sheet 5 as an example of a recording medium, a sheet feed device 50 as an example of sheet feed means according to the present exemplary embodiment that accommodates and transports a required recording sheet 5 to be supplied to the secondary transfer position of the intermediate transfer device 20, a fixing device 40 that fixes the toner images on the recording sheet 5 secondarily transferred by the intermediate transfer device 20, and the like. The plurality of image forming devices 10 and the intermediate transfer device 20 configure image forming means for forming an image on the recording sheet 5. Note that the apparatus main body 1a of the image forming apparatus 1 is formed by a support structure member, an exterior cover, or the like.
The image forming devices 10 are configured by four image forming devices 10Y, 10M, 10C, and 10K that exclusively form toner images of four colors of yellow (Y), magenta (M), cyan (C), and black (K), respectively. These four image forming devices 10 (Y, M, C, and K) are arranged in a row in an inclined manner in an internal space of the apparatus main body 1a. Among the four image forming devices 10 (Y, M, C, and K), the image forming device 10Y for yellow (Y) is positioned at an upper position along a vertical direction Z and is relatively high, and the image forming device 10K for black (K) is positioned at a relatively low position.
As illustrated in
The photoreceptor drum 11 is obtained by forming an image holding surface having a photoconductive layer (photosensitive layer) made of a photosensitive material on the peripheral surface of a grounded cylindrical or columnar base material. The photoreceptor drum 11 is supported so as to be rotatable in a direction indicated by an arrow A by transmitting drive power from a rotary drive device (not illustrated).
As illustrated in
The exposure device 13 radiates the charged peripheral surface of the photoreceptor drum 11 with light formed according to image information of a document read by the image reading device 2 or image information input to the image forming apparatus 1, to form an electrostatic latent image. At the time of latent image formation, the image information (signal) of the document read by the image reading device 2 or the image information (signal) input to the image forming apparatus 1 by any means is transmitted to the exposure device 13.
The exposure device 13 includes a light emitting diode (LED) print head that forms the electrostatic latent image by emitting light in accordance with the image information toward the photoreceptor drum 11, using a plurality of LEDs as a plurality of light emitting elements arranged in an axial direction of the photoreceptor drum 11. Note that as the exposure device 13, laser light formed in accordance with the image information to perform deflection scanning in the axial direction of the photoreceptor drum 11 may be used.
Each of the developing devices 14 is configured by disposing, inside a housing 140 in which an opening portion at a position facing the photoreceptor drum 11 and a developer accommodating chamber are formed, a developing roll 141 that holds a developer and transports the developer to a developing region facing the photoreceptor drum 11, an agitating and supplying member 142 formed of a screw auger or the like that supplies the developer so as to pass through the developing roll 141 while agitating the developer, an agitating and transporting member 143 formed of a screw auger or the like that transports the developer to the agitating and supplying member 142 while agitating the developer, a layer thickness regulating member 144 that regulates the amount (layer thickness) of the developer held on the developing roll 141, and the like. In the developing device 14, a developing voltage is supplied from a power supply device (not illustrated) between the developing roll 141 and the photoreceptor drum 11. For example, a two component developer that includes non-magnetic toner and a magnetic carrier is used as the developers of four colors.
The primary transfer device 15 is a contact-type transfer device including a primary transfer roll that rotates in contact with the periphery of the photoreceptor drum 11 via an intermediate transfer belt 21 and to which a primary transfer voltage is supplied. As the primary transfer voltage, a DC voltage having a polarity opposite to the charging polarity of the toner is supplied from a power supply device (not illustrated).
As illustrated in
As illustrated in
As the intermediate transfer belt 21, for example, an endless belt made of a material in which a resistance adjusting agent such as carbon black is dispersed in a synthetic resin such as a polyimide resin or a polyamide resin is used. In addition, the belt support roll 22 is configured as a driving roll that is rotationally driven by a driving device (not illustrated), the belt support roll 23 is configured as a flattening roll that holds a traveling position or the like of the intermediate transfer belt 21, the belt support roll 24 is configured as a tension applying roll that applies tension to the intermediate transfer belt 21, and the belt support roll 25 is configured as a backup roll for secondary transfer.
As illustrated in
As illustrated in
The fixing device 40 is configured by disposing a heating rotating body 41 in a drum form or a belt form that is heated by heating means so that a surface temperature is held at a required temperature, a pressurizing rotating body 42 in a drum form or a belt form that rotates in contact with the heating rotating body 41 at a predetermined pressure in a state of being substantially along the axial direction of the heating rotating body 41, and the like. At an exit of the fixing device 40, an exit roll 43 is provided to transport the recording sheet 5 subjected to the fixing processing. In the fixing device 40, a contact portion where the heating rotating body 41 and the pressurizing rotating body 42 come into contact with each other serves as a fixing processing portion that performs required fixing processing (heating and pressurizing).
The sheet feed device 50 is disposed at a position below the image forming devices 10 (Y, M, C, and K) of yellow (Y), magenta (M), cyan (C), and black (K) along the vertical direction Z. The sheet feed device 50 is mainly configured by a plurality of (or a single) sheet accommodating bodies 51 that accommodate the recording sheets 5 of a desired size, type, and the like in a stacked state, pickup rolls 52 that feed the recording sheets 5 one by one from the sheet accommodating bodies 51, feed rolls 53a, and retard rolls 53b. The sheet accommodating body 51 is, for example, attached to a front surface side (a side surface that a user faces during operation) of the apparatus main body 1a, and to the front side of a paper surface in the illustrated example so that the sheet accommodating body 51 can be pulled out. Note that the sheet feed device 50 will be described in detail later.
Examples of the recording sheet 5 include plain paper, thin paper, an overhead projector (OHP) sheet, and the like used in an electrophotographic copier, a printer, or the like. In order to further improve the smoothness of the surface of the image after fixing, the surface of the recording sheet 5 is also preferably as smooth as possible, and for example, so-called thick paper or the like having a relatively large basis weight, such as coated paper obtained by coating the surface of the plain paper with a resin or the like, and art paper for printing, can also be used. As the recording sheet 5, envelopes of various sizes can be used.
Between the sheet feed device 50 and the secondary transfer device 30, a sheet feed transport path 56 that includes a plurality of (or a single) sheet transport roll pairs 54 and 55 which transport the recording sheet 5 sent out from the sheet feed device 50 to the secondary transfer position, a transport guide (not illustrated), and the like are provided. The sheet transport roll pair 55 is configured as, for example, a registration roll that adjusts a transport time of the recording sheet 5. In addition, a sheet discharge transport section 58 including first to fourth sheet discharge transport paths 57a to 57d for discharging the recording sheet 5 after fixing which is sent out from the exit roll 43 of the fixing device 40 to a sheet discharge device 60 provided in the upper portion of the apparatus main body 1a is provided above the fixing device 40 along the vertical direction Z.
The sheet discharge device 60 includes first and second discharge trays 61 and 62 of a so-called in-body discharge type provided in an upper portion of the apparatus main body 1a, and a third discharge tray 63 provided on a side surface (a left side surface in the drawing) of the sheet discharge transport section 58 so as to face the outside. The first sheet discharge transport path 57a branching from the second sheet discharge transport path 57b and including a first sheet discharge roll pair 64 for discharging the recording sheet 5 to the first discharge tray 61, the third sheet discharge transport path 57c branching from the second sheet discharge transport path 57b and including a second sheet discharge roll pair 66 for discharging the recording sheet 5 to the second discharge tray 62, and the fourth sheet discharge transport path 57d branching from the third sheet discharge transport path 57c and including a third sheet discharge roll pair 67 for discharging the recording sheet 5 to the third discharge tray 63 are provided inside the sheet discharge transport section 58.
In
Inside the apparatus main body 1a, as illustrated in
In
Further, reference signs 145 (Y, M, C, and K) in
In addition, in
A basic image forming operation performed by the image forming apparatus 1 is described below.
Here, an operation of forming a full-color image configured by combining toner images of four colors (Y, M, C, and K) using the four image forming devices 10 (Y, M, C, and K) will be described.
In the image forming apparatus 1, when the control device 100 receives instruction information of a request for an image forming operation (printing), the four image forming devices 10 (Y, M, C, and K), the intermediate transfer device 20, the secondary transfer device 30, the fixing device 40, and the like are started.
Next, in each of the image forming devices 10 (Y, M, C, and K), first, each of the photoreceptor drums 11 rotates in a direction indicated by an arrow A, and each of the charging devices 12 charges the surface of each of the photoreceptor drums 11 to a required polarity (a negative polarity in the first exemplary embodiment) and potential. Subsequently, the exposure device 13 radiates the charged surface of the photoreceptor drum 11 with light emitted based on image signals obtained by converting image information input to the image forming apparatus 1 into respective color components (Y, M, C, and K) to form electrostatic latent images of the respective color components formed by required potential differences on the surface.
Subsequently, the image forming devices 10 (Y, M, C, and K) develop the electrostatic latent images of the respective color components formed on the photoreceptor drums 11 by supplying the toners of the corresponding colors (Y, M, C, and K) charged to the required polarity (negative polarity) from the developing rolls 141 and electrostatically adhering the toners. By this development, the electrostatic latent images of the respective color components formed on the photoreceptor drums 11 are visualized as toner images of four colors (Y, M, C, and K) developed with the toners of the corresponding colors.
Next, when the toner images of the respective colors formed on the photoreceptor drums 11 of the image forming devices 10 (Y, M, C, and K) are transported to the primary transfer position, the primary transfer devices 15 (Y, M, C, and K) cause the toner images of the respective colors to be primarily transferred to the intermediate transfer belt 21 of the intermediate transfer device 20, which rotates in a direction indicated by an arrow B, so as to be sequentially superimposed on each other.
In addition, in each of the image forming devices 10 (Y, M, C, and K) in which the primary transfer is completed, the drum cleaning device 16 cleans the surface of the photoreceptor drum 11 by scraping off and removing the adhered substances. Thus, each of the image forming devices 10 (Y, M, C, and K) is made ready for the next image forming operation.
Subsequently, in the intermediate transfer device 20, the toner image primarily transferred by the rotation of the intermediate transfer belt 21 is held and transported to the secondary transfer position. On the other hand, the sheet feed device 50 feeds a required recording sheet 5 to the sheet feed transport path 56 in accordance with the image forming operation. In the sheet feed transport path 56, the sheet transport roll pair 55 as the registration rolls sends out and supplies the recording sheet 5 to the secondary transfer position in accordance with the transfer timing.
At the secondary transfer position, the secondary transfer roll 31 of the secondary transfer device 30 collectively secondarily transfers the toner images on the intermediate transfer belt 21 to the recording sheet 5. In addition, in the intermediate transfer device 20 in which the secondary transfer is completed, the belt cleaning device 26 removes and cleans adhered substances such as toner remaining on the surface of the intermediate transfer belt 21 after the secondary transfer.
Subsequently, the recording sheet 5 to which the toner image is secondarily transferred is separated from the intermediate transfer belt 21 and the secondary transfer roll 31, and is then transported to the fixing device 40. In the fixing device 40, the recording sheet 5 after the second transfer is introduced and passed through a contact portion between the rotating heating rotating body 41 and the pressurizing rotating body 42, so that necessary fixing processing (heating and pressurizing) is performed and the unfixed toner images are fixed on the recording sheet 5. Finally, in an image forming operation of forming an image only on one side of the recording sheet 5 after fixing, the recording sheet 5 is discharged to any one of the first to third discharge trays 61 to 63 installed in an upper portion of the apparatus main body 1a via the first to fourth sheet discharge transport paths 57a to 57d.
When images are formed on both sides of the recording sheet 5, the recording sheet 5 with an image formed on one side is not discharged to the first discharge tray 61 by the first sheet discharge roll pair 64, and the rotation direction of the first sheet discharge roll pair 64 is switched to the reverse rotation direction while the first sheet discharge roll pair 64 holds a rear end of the recording sheet 5. The recording sheet 5 transported in the reverse direction by the first sheet discharge roll pair 64 is transported to the two-sided transport path 70 including the sheet transport roll pair 69 and the like, and is transported again to the sheet transport roll pair 55 in a state where the front and back are reversed. The sheet transport roll pair 55 feeds and supplies the recording sheet 5 to the secondary transfer position in accordance with the transfer timing, forms an image on a back surface of the recording sheet 5, and discharges the recording sheet 5 having the image fixed on the back surface to one of the first to third discharge trays 61 to 63 installed in an upper portion of the apparatus main body 1a via one of the first to fourth sheet discharge transport paths 57a to 57d.
Through the above-described operation, the recording sheet 5 having, on one side or both sides, a full-color image formed by combining toner images of four colors is output.
As illustrated in
The sheet accommodating body 51 is attached so as to be able to be pulled out, for example, to a front surface (side surface that a user faces during operation) side of the apparatus main body 1a as an example of a housing, and to the front side of the paper surface in the illustrated example.
As illustrated in
In the apparatus main body 1a, detection means (not illustrated) for detecting the pulling-out of the sheet accommodating body 51 when the user places his/her hand on the grip portion 517 of the operation panel 516 when pulling out the sheet accommodating body 51 from the apparatus main body 1a are provided.
A bottom plate 518 on which a plurality of sheets of recording sheet 5 are placed in a stacked state is disposed at the bottom wall portion 511 of the sheet accommodating body 51. The bottom plate 518 is attached to the front and rear portions 514 and 515 of the sheet accommodating body 51 so that an end portion 518c on the downstream side along the sheet feeding direction is rotatable upward around rotation fulcrums 518b provided at both end portions along the depth direction (width direction) Y intersecting the sheet feeding direction at an end portion 518a on an upstream side along the sheet feeding direction. On the back surface of the end portion 518c of the bottom plate 518 on the downstream side along the sheet feeding direction, a crank-shaped drive member 519 that rotates the bottom plate 518 along an up-down direction in a state where the recording sheets 5 are stacked is rotatably provided at the bottom wall portion 511 of the sheet accommodating body 51. When the sheet accommodating body 51 is attached to the sheet feed position of the apparatus main body 1a, a driving force is transmitted from drive means (not illustrated) provided in the apparatus main body 1a, and the drive member 519 is rotationally driven in a required direction over a required angle.
Furthermore, the bottom plate 518 is configured to, when detection means (not illustrated) detect that the sheet accommodating body 51 has been pulled out from the apparatus main body 1a, descend to the bottom wall portion 511 by driving of the drive member 519 by drive means (not illustrated) on the apparatus main body 1a side.
On the other hand, when the detection means (not illustrated) detect that the sheet accommodating body 51 is attached to the sheet feeding position of the apparatus main body 1a, the drive member 519 is driven by the drive means (not illustrated) on the apparatus main body 1a side, and the bottom plate 518 moves to the sheet feeding position where the uppermost recording sheet 5 among the recording sheets 5 accommodated in the sheet accommodating body 51 abuts against the pickup roll 52.
As illustrated in
The bottom plate 518 is provided with a plurality of openings 524 each having a rectangular shape in plan view and allowing movement of the end guide 521 and the side guides 522 and 523.
In the sheet feed device 50, as illustrated in
Further, in the sheet feed device 50, the feed roll 53a and the retard roll 53b for separating and feeding the recording sheets 5 fed by the pickup roll 52 one by one are disposed on the downstream side of the pickup roll 52 along the sheet feeding direction so as to be rotationally driven at a required timing. The feed roll 53a comes into pressure contact with the retard roll 53b and transports only the uppermost one sheet of the recording sheet 5 among the recording sheets 5 fed by the pickup roll 52 to the downstream side along the sheet feeding direction. On the other hand, the retard roll 53b is urged to rotate in the reverse direction to the feed roll 53a, and performs an operation of transporting the second and subsequent recording sheets 5, which are fed together with the uppermost recording sheet 5, in the reverse direction to the sheet feeding direction so that the plurality of sheets of recording sheets 5 are not fed at the same time.
Two pickup rolls 52, two feed rolls 53a, and two retard rolls 53b are disposed in the center of the recording sheets 5 along the width direction intersecting the sheet feeding direction with respect to each sheet accommodating body 51.
As illustrated in
As illustrated in
As illustrated in
As illustrated in
As illustrated in
Incidentally, as described above, in the sheet feed device 50, the sheet accommodating body 51 is pulled out from the apparatus main body 1a when the recording sheets 5 are replenished in the sheet accommodating body 51. Then, in the sheet feed device 50, the pull-out operation of the sheet accommodating body 51 is detected by the detection means (not illustrated), and as illustrated in
At this time, it takes a certain time until the pull-out operation of the sheet accommodating body 51 is detected by the detection means and the bottom plate 518 of the sheet accommodating body 51 actually starts to descend. Therefore, in the sheet feed device 50 in the related art, the sheet accommodating body 51 may be pulled out from the apparatus main body 1a after the pull-out operation of the sheet accommodating body 51 is detected and before the bottom plate 518 has completely descended to the bottom wall portion 511. In particular, there is a technical problem in that so-called remaining sheet, in which the recording sheets 5 remain inside the apparatus main body 1a, occurs, for example, in a case where the number sheets of recording sheets 5 accommodated in the sheet accommodating body 51 is large, the sheet accommodating body 51 is pulled out before the uppermost recording sheet 5 among the recording sheets 5 accommodated in the sheet accommodating body 51 is sufficiently separated from the pickup roll 52, and the recording sheet 5 accommodated in the sheet accommodating body 51 abuts against the support frame 84 or the like of the apparatus main body 1a positioned on the front side along the pull-out direction.
In some cases, the sheet accommodating body 51 is pulled out from the apparatus main body 1a in a state where the leading end of the recording sheet 5 is transported to the downstream side along the sheet feeding direction by the pickup roll 52. Also in this case, the recording sheets 5 accommodated in the sheet accommodating body 51 abut against the support frame 84 or the like of the apparatus main body 1a positioned on the front side along the pull-out direction, so that so-called remaining sheet occurs in which the recording sheets 5 remain inside the apparatus main body 1a.
In contrast, in the sheet feed device 50 in the related art, in order to prevent the uppermost recording sheet 5 or the like in the sheet accommodating body 51 from abutting against the support frame 83 and remaining inside the apparatus main body 1a when the sheet accommodating body 51 is pulled out from the apparatus main body 1a, as illustrated in
However, as illustrated in
To further explain, in the sheet feed device 50 in the related art, as illustrated in
Then, in the sheet feed device 50 in the related art, the corner portion 5b of the recording sheet 5 on the downstream side along the pull-out direction cannot completely pass through the concave portion 90 provided in the attachment frame 89 of the apparatus main body 1a, and abuts against the attachment frame 89 of the apparatus main body 1a, thus still having a risk of causing a so-called remaining sheet in which the recording sheet 5 remains inside the apparatus main body 1a.
In view of this, the sheet feed device according to the first exemplary embodiment is configured to include a concave portion having a concave shape toward the sheet feeding direction of the recording medium on the front side in the pull-out direction of the accommodating section, and a protruding portion provided on the accommodating section side so that a member protrudes relative to the concave portion when the concave portion is viewed from the front side to the back side in the pull-out direction.
That is, as illustrated in
The concave portion 90 may of course be provided directly in the support frame 84 of the apparatus main body 1a, but is not limited to the case of being provided directly in the support frame 84.
In the sheet feed device 50 according to the first exemplary embodiment, as illustrated in
As illustrated in
As illustrated in
Incidentally, as illustrated in
As a result, the concave portion 90 is provided with a concave shape toward the sheet feeding direction of the recording sheet 5 on the front side along the pull-out direction of the sheet accommodating body 51. A nip between the feed roll 53a and the retard roll 53b is disposed at an entrance of the concave portion 90. A leading end of the introduction plate 525 of the sheet accommodating body 51 is positioned above the inclined portion 94b in the lower end portion 94 of the concave portion 90. The lower step portion 94c in the lower end portion 94 of the concave portion 90 prevents the vertical plate portion 892 of the attachment frame 89 from interfering with the introduction plate 525 of the sheet accommodating body 51.
Furthermore, as illustrated in
As illustrated in
As illustrated in
The protruding portion 97 is formed in a triangular pyramid shape in the middle of the guide surface 82 along the curved shape of the first guide member 80. Since the protruding portion 97 is formed in a triangular pyramid shape, the recording sheet 5 can be guided more smoothly as compared with a case where the protruding portion 97 protrudes in a shape other than the triangular pyramid shape. A side surface 971 positioned at an outer end of the protruding portion 97 along the longitudinal direction of the first guide member 80 is disposed so as to be flush with an outer side surface of the first guide member 80. In addition, the triangular side surface 972 positioned on the inner side of the protruding portion 97 is disposed so that a lower end edge 972a of the side surface 972 is inclined from the outer end of the first guide member 80 along the longitudinal direction toward a sheet passing region, in a non-sheet passing region of the first guide member 80. In this way, by providing the protruding portion 97 in the non-sheet passing region, it is possible to prevent the protruding portion 97 from interfering with the recording sheet 5 to be fed, compared to a case where the protruding portion 97 is provided in the sheet passing region.
Furthermore, an end edge 972b including the vertex of the triangular pyramid positioned on the upstream side of the side surface 972 of the protruding portion 97 along the sheet feeding direction is disposed in a state of standing along the vertical direction Z. As a result, as illustrated in
In other words, the end edge 972b positioned on the upstream side of the side surface 972 of the protruding portion 97 along the sheet feeding direction is a member provided so that a part of the protruding portion 97 protrudes relative to the concave portion 90 toward the sheet accommodating body 51 (the right side in the drawing) side when the concave portion 90 is viewed from the front side toward the back side in the pull-out direction of the sheet accommodating body 51. Thus, by providing the end edge 972b of the protruding portion 97 so as to protrude relative to the concave portion 90 on the sheet accommodating body 51 (toward the right in the drawing) side, the recording sheet 5 can be prevented from coming into contact with the concave portion 90 even when attachment errors occur in the protruding portion 97, as compared with a case where the end portion on the front side along the pull-out direction is flush with the vertical portion 92 of the concave portion 90.
As illustrated in
Therefore, as illustrated in
Then, the recording sheet 5 moves along the side surface 972 of the protruding portion 97 in accordance with the pull-out operation of the sheet accommodating body 51, moves inside the concave portion 90 relative to the vertical portion 92 of the concave portion 90 of the attachment frame 89, that is, moves on the sheet accommodating body 51 side, and is prevented from coming into contact with the concave portion 90 of the attachment frame 89 and remaining inside the apparatus main body 1a.
In the sheet feed device according to the first exemplary embodiment, in a case where the accommodating section that accommodates the recording medium is pulled out from the housing in the following manner, it is possible to prevent the recording medium from remaining inside the housing in comparison with a case where the recording medium comes into contact with the concave portion that is provided in the frame of the housing and is provided with the concave shape toward the sheet feeding direction of the recording medium on the front side in the pull-out direction in which the accommodating section is pulled out.
That is, as illustrated in
At that time, in the sheet feed device 50, for example, in a case where the sheet accommodating body 51 is pulled out before the bottom plate 518 is completely descend to the bottom wall portion 511 or in a case where the leading end of the recording sheet 5 is positioned in the vicinity of the feed roll 53a and the retard roll 53b positioned on the downstream side of the pickup roll 52 along the sheet feeding direction, the sheet accommodating body 51 may be pulled out in a state where the uppermost recording sheet 5 comes into contact with the pickup roll 52 and rotates in the clockwise direction in accordance with the pull-out operation of the sheet accommodating body 51.
Then, in the sheet feed device 50, as illustrated in
Note that in the above-described exemplary embodiment, although the full-color image forming apparatus has been described, it is needless to say that the present disclosure can be similarly applied to a monochrome image forming apparatus.
Further, in the above-described exemplary embodiment, the case where the protruding portion 97 is provided in the first guide member 80 has been described, but the protruding portion 97 is not limited to the case where the protruding portion 97 is provided in the first guide member 80, and may be configured to be provided in another member, for example, the attachment frame 89 or the like.
(((1))) A sheet feed device comprising:
| Number | Date | Country | Kind |
|---|---|---|---|
| 2023-139614 | Aug 2023 | JP | national |
