JP2020196566A - Sheet feeding device, image reading device, and image formation device - Google Patents

Abstract

To provide a sheet feeding device capable of preventing a lifting tray from interfering with a device body when support means supporting the lifting tray is rotated, while the size of the device is reduced.SOLUTION: An ADF comprises a support tray 21c, which rotatably supports a lifting tray 21d and further is rotatably supported by a device body 10, in a loading tray 21. Further, a guide member 34 standing so as to protrude from an installation surface 26a in the device body 10 is provided. A sliding part 34A of the guide member 34, when the support tray 21c is rotated, slides a slid part 21m of the lifting tray 21d to guide a vertical position. The sliding part 34A includes a first inclined plane 34b which guides the slid part 21m so that the support tray 21c is made to go higher than a state positioned at the lowest part in a rotational direction, and a second inclined plane 34c which guides the slid part 21m so as to be positioned above the first inclined plane 34b.SELECTED DRAWING: Figure 7

Description

The present invention relates to a sheet feeding device, an image reading device, and an image forming device provided with a sheet loading means rotatably supported on the main body of the device.

For example, in an image reading device provided in an image forming device such as a copier, an ejection tray for ejecting an image-read document is generally arranged below a loading tray for loading a sheet which is a document. .. In such an image reading device, in order to enable reading a large amount of documents at one time, an elevating tray is provided on the loading tray, and even if the number of documents is reduced, the tip side is raised to enable feeding by a pickup roller. There is something to do (see Patent Document 1). Further, the document of Patent Document 1 is configured so that the loading tray can be rotated upward in order to take out the original document ejected to the ejection tray and to remove the original jammed document in the ejection section. ing.

Japanese Unexamined Patent Publication No. 2008-156023

By the way, in recent years, miniaturization of the device has been desired, and some devices are provided with an elevating mechanism for an elevating tray and a driving means thereof. When the elevating device provided in the main body of the device is used to elevate the elevating tray, it is necessary to insert the elevating tray into the back. Patent Document 1 discloses that a protrusion (42d) provided below the elevating tray abuts on a flat surface portion (61) to hold the position of the elevating tray when the loading tray rotates. However, if such protrusions are not made small, the loadable amount of documents will be reduced. In addition, when the elevating tray is inserted all the way into the main body of the device, there is a problem that the tip of the elevating tray and the sensor that detects the loading of documents interfere with members such as the flat surface of the main body of the device with only a small protrusion. is there.

Therefore, the present invention is a sheet feeding device capable of preventing the elevating tray from interfering with the device main body when the supporting means for supporting the elevating tray is rotated, while enabling miniaturization. , An image reading device, and an image forming device.

This sheet feeding device includes an elevating tray that can move up and down on the downstream side of the loaded sheet in the feeding direction, a supporting means that rotatably supports the elevating tray and rotatably supports the device body. A seat loading means including the above, an elevating means for raising and lowering the elevating tray, a feeding means for feeding the seat of the elevating tray raised by the elevating means, and a protrusion from an installation surface on the apparatus main body. It is provided with a guide member that guides the slidable portion of the elevating tray by a sliding portion that slides the slidable portion of the elevating tray when the support means is rotated. The sliding portion abuts on the sliding portion in a state where the supporting means is located in the first rotation range above the lowermost position in the rotation direction, and the supporting means is at the lowermost position in the rotation direction. Positioned on a first surface that guides the sliding portion so as to move upward from the state in the state and a second rotation range in which the support means is above the first rotation range in the rotation direction. It is characterized by having a second surface that comes into contact with the sliding portion and guides the sliding portion so as to be located above the first surface.

According to the present invention, when the supporting means for supporting the elevating tray is rotated, the elevating tray can be raised by the first surface of the guide member, and the position of the elevating tray can be maintained upward by the second surface. It is possible to prevent the elevating tray from interfering with the main body of the device.

The whole schematic which shows the printer which concerns on this embodiment. The schematic diagram which shows the image reading apparatus which concerns on this embodiment. The upper perspective view which shows the loading tray which concerns on this embodiment. The lower perspective view which shows the loading tray which concerns on this embodiment. A side sectional view showing a loading tray according to this embodiment. (A) A diagram showing a state in which the elevating tray is in the lowermost position, and (b) a diagram showing a state in which the elevating tray is in an elevated position. (A) A diagram showing a state in which the loading tray is in the lowermost position, (b) a diagram showing a position of the loading tray in a state where the sliding portion is on the first inclined surface, (c) a diagram showing the position of the loading tray in a state where the sliding portion is on the first inclined surface, (c) the sliding portion is the second The figure which shows the position of the loading tray in the state which is in the inclined surface, (d) the figure which shows the state which shows the state which the loading tray is in the uppermost position.

Hereinafter, the image reading device and the image forming device according to the present invention will be described with reference to the drawings. The dimensions, materials, shapes, relative arrangements, and the like of the components described in the following embodiments are not intended to limit the scope of application of the present technology to those unless otherwise specified. ..

[Outline configuration of printer]
First, a schematic configuration of the printer 101 as an image forming apparatus will be described with reference to FIG. As shown in FIG. 1, the printer 101 includes a printer main body 101A and an image reading device 103. The image reading device 103 arranged above the printer main body 101A includes a reading unit 30 and an ADF 1 as described in detail later, and optically scans the document D to read image information. The manuscript D is a sheet such as paper, envelopes, or other paper, or a plastic film such as an overhead projector sheet (OHT). The image information converted into an electric signal by the image reading device 103 is transferred to the control unit 122 provided in the printer main body 101A. In the present embodiment, the front side of the device when standing facing the operation panel (not shown) for operating the printer 101 is defined as the front side, and the back side of the device is defined as the back side.

The printer main body 101A has an image forming unit 119 that forms an image on a sheet P that is a recording medium, a sheet feeding unit 54 that feeds the sheet P to the image forming unit 119, and a manual feeding unit 117. ing. The sheet feeding unit 54 includes sheet storage units 137a, 137b, 137c, and 137d capable of storing sheets of different sizes. The sheets stored in each sheet storage unit are unwound by the pickup roller 52, separated one by one by the feed roller 53a and the retard roller 53b, and delivered to the corresponding transfer roller pair 120. Then, the sheet P is transferred to the registration roller pair 136 by being sequentially delivered to the plurality of transfer roller pairs 120 arranged along the sheet transfer path.

The sheet P placed on the manual feed tray 137e of the manual feed feed unit 117 by the user is fed to the inside of the printer main body 101A by the feed roller 138 and conveyed to the registration roller pair 136. The registration roller pair 136 stops the tip of the sheet P to correct the skew, and restarts the transfer of the sheet P in accordance with the progress of the image forming operation, which is the process of forming the toner image by the image forming unit 119.

The image forming unit 119 that forms an image on the sheet P is an electrophotographic unit including a photosensitive drum 121 that is a photoconductor. The photosensitive drum 121 is rotatable along the transport direction of the sheet P, and around the photosensitive drum 121, a charging device 118, an exposure device 123, a developing device 124, a transfer charging device 125, a separation charging device 126, and a cleaner 127 are provided. Is placed. The charger 118 uniformly charges the surface of the photosensitive drum 121, and the exposure device 123 exposes the photosensitive drum 121 based on the image information input from the image reading device 103 or the like, and an electrostatic latent image is formed on the photosensitive drum 121. To form.

The developer 124 contains a two-component developer containing toner and a carrier, and develops an electrostatic latent image into a toner image by supplying charged toner to the photosensitive drum 121. The toner image supported on the photosensitive drum 121 is transferred to the sheet P conveyed from the registration roller pair 136 by the bias electric field formed by the transfer charger 125. The sheet P to which the toner image is transferred is separated from the photosensitive drum 121 by the bias electric field formed by the separation charger, and is conveyed toward the fixing portion 129 by the pre-fixing conveying portion 128. Adhesions such as transfer residual toner remaining on the photosensitive drum 121 without being transferred to the sheet P are removed by the cleaner 127, and the photosensitive drum 121 prepares for the next image-forming operation.

The sheet P conveyed to the fixing portion 129 is sandwiched between roller pairs and heated while being pressurized, and the image is fixed by melting and fixing the toner. When the image output is completed, the sheet P from which the fixed image is obtained is discharged to the discharge tray 130 protruding outward from the printer main body 101A via the discharge roller pair 40. When an image is formed on the back surface of the sheet P in double-sided printing, the front surface and the back surface of the sheet P that has passed through the fixing portion 129 are exchanged by the reversing portion 139, and the sheet P is conveyed to the registration roller pair 136 by the double-sided conveying portion 140. To. Then, the sheet P whose image is formed again by the image forming unit 119 is discharged to the discharge tray 130.

[Image reader]
Next, the image reading device 103 will be described in detail. As shown in FIG. 2, the image reading device 103 reads the ADF (automatic document transporting device) 1 that feeds and discharges the documents loaded on the loading tray 21 and discharges the documents to the ejection tray 23, and the documents transported by the ADF 1. It includes a unit 30 and. The reading unit has an image reading unit 31 that reads an image on the surface of the document D. Further, the loading tray 21 constitutes a sheet loading means. That is, the ADF 1 constitutes a sheet feeding device that feeds the document D as a sheet to the image reading unit 31. The ADF1 is rotatably supported by a hinge with respect to the reading unit 30 so that the platen glass 33 can be opened. Further, the document D, which is an example of the sheet, may be a blank sheet or may have an image formed on one side or both sides.

The ADF1 is provided with a loading tray 21 as a sheet loading means, and the loading tray 21 can be raised and lowered by rotating the support tray 21c as a support means and the rotation shaft 21j with respect to the support tray 21c as fulcrums. An elevating tray 21d is provided. Further, the device main body 10 of the ADF 1 is provided with a device cover 11 that covers the inside of the device. The device cover 11 forms an opening 10A for receiving the document D, and the elevating tray 21d is inserted into the opening 10A. Further, the ADF1 includes an elevating plate 22 as an elevating means for elevating and lowering the elevating tray 21d, a pickup roller 29a as a feeding means, and a separation pad 21b as a separating means inside the device cover 11 (see FIG. 3). , And a feeding roller 29b. Further, the ADF1 has a registration roller pair 29c, a transport roller pair 29d, 29e, 29f, an image reading unit 27, and a discharge roller pair 29g inside the device cover 11. The ADF 1 is provided with a discharge tray 23 as a discharge loading means for loading the document D discharged from the discharge roller pair 29 g. The downstream side of the discharge roller vs. 29 g in the sheet transport direction constitutes the discharge port 25 for discharging the document D to the discharge tray 23.

On the other hand, the reading unit 30 has a platen glass 32, a platen glass 33, and an image reading unit 31. The image reading unit 31 is configured to be movable in parallel with the platen glass 33 by a wire or belt driven by a motor (not shown). Further, a mirror 311, a lens 312, and a CCD type sensor 313 are provided inside the image reading unit 31, and the mirror 311 irradiates the document D with light reflected from a light source (not shown). It reflects and reads the image with the sensor 313 via the lens 312. The image reading unit 27 built into the ADF 1 is also configured in the same manner as the image reading unit 31.

The image reading device 103 has a scanning mode in which the document D loaded on the loading tray 21 is fed by the ADF1 and the document image is scanned, and a fixed reading mode in which the document placed on the platen glass 33 is scanned. The image information is read from the document D. The scanning mode is selected when the document D loaded on the loading tray 21 is detected by the document presence / absence sensor 21a described later, or when the user explicitly instructs the printer body 101A by an operation panel or the like.

The case where the scan mode is executed will be described. First, as shown in FIG. 6A, the elevating tray 21d is located at the lowermost position. From this state, when there is a feed command signal, the elevating plate 22 that is driven and connected to the drive shaft 22a that is driven and rotated via the gear mechanism by a motor (not shown) is rotated, and the elevating plate 22 is moved to the elevating tray 21d. The elevating tray 21d is raised as shown in FIG. 6B by abutting against the back surface. Then, the pickup roller 29a is raised together with the document D while the pickup roller 29a is in contact with the uppermost document D on the elevating tray 21d. Then, the document D is fed by rotationally driving the pickup roller 29a, and is separated one by one by giving a transport resistance to the document D other than the uppermost document D at the separation nip formed by the separation pad 21b.

The elevating plate 22 raises the elevating tray 21d each time a predetermined number of documents D are fed, and is controlled so that the highest document D has an optimum height for feeding. When the document presence / absence sensor 21a, which will be described later, detects that the document D has disappeared, the elevating plate 22 is rotated in the opposite direction by a motor (not shown), and the elevating tray 21d is rotated by its own weight as shown in FIG. 6A. It descends to the lowest position in the direction.

As shown in FIG. 2, the document D separated one by one is fed to the registration roller pair 29c by the feeding roller 29b, and the tip of the document D hits the registration roller pair 29c in the stopped state, and the document The skew of D is corrected. The original D whose skew is corrected is conveyed by the registration roller pair 29c, and is conveyed toward the platen glass 32 and the image reading unit 31 by the transfer roller pairs 29d, 29e, 29f. The platen rollers 29h and 29i are arranged so as to face the platen glass 32, and the platen rollers 29h and 29i guide the document D passing through the platen glass 32 so as not to float from the platen glass 32.

The image on the front surface of the document D is read by the image reading unit 31 via the platen glass 32, and the image on the back surface of the document D is read by the image reading unit 27. The image information photoelectrically converted by the light receiving elements of the image reading units 31 and 27 is transferred to the control unit 122 (see FIG. 1). Then, the document D that has passed through the image reading unit 27 is discharged to the discharge tray 23 by the discharge roller pair 29g.

On the other hand, the fixed reading mode is selected when the apparatus detects the document D placed on the platen glass 33 or when the user explicitly instructs the printer body 101A by the operation panel or the like. In this case, the document D on the platen glass 33 does not move, and the image reading unit 31 moves along the platen glass 33 to scan the document D. Similarly, the image information photoelectrically converted by the light receiving element of the image reading unit 31 is transferred to the control unit 122 (see FIG. 1).

[Details of loading tray]
Next, the structure of the loading tray 21 will be described with reference to FIGS. 3 to 5. As shown in FIG. 5, the loading tray 21 is roughly configured to include a support tray 21c and an elevating tray 21d. As shown in FIGS. 3 and 4, the support tray 21c has side wall portions 21n at both ends in the width direction orthogonal to the feeding direction of the document D, and is integrally downstream from the side wall portions 21n in the feeding direction. It has an arm portion 21h extending to the side. A first rotating shaft 21g extending outward in the width direction is formed on the arm portions 21h, and the rotating shaft 21g is engaged with an engaging hole (not shown) in the device main body 10 of the ADF1. To. That is, the entire loading tray 21 is rotatably supported by the first rotating shaft 21g with respect to the apparatus main body 10. A stopper portion 21i formed in a protruding shape is formed at the tip of the arm portion 21h, and when the loading tray 21 is rotated upward, it comes into contact with a regulation portion (not shown) of the apparatus main body 10. , Restrict to the uppermost position of the loading tray 21. As shown in FIG. 4, the bottom surface of the support tray 21c is formed in a shape that does not hinder the ejection of the document D.

Further, as shown in FIG. 5, a second rotation shaft 21j is formed at the upstream end of the support tray 21c in the feeding direction. On one of the elevating trays 21d, an engaging groove 21e that rotatably engages with the second rotating shaft 21j is formed. That is, the elevating tray 21d is rotatably supported with respect to the support tray 21c.

As shown in FIG. 3, the upper surface of the elevating tray 21d is a loading surface on which the document D is loaded, and side regulating members 21f are provided on both sides of the loading surface so as to be slidable in the width direction, and the document D is provided. It is configured so that the positions of both ends in the width direction of the can be regulated. The side regulating members 21f are driven and connected to an interlocking mechanism including, for example, a rack and pinion mechanism so as to slide and move in interlocking with each other in the width direction. This interlocking mechanism is housed between the support tray 21c and the elevating tray 21d in the vertical direction.

Further, as shown in FIG. 3, a separation pad 21b is embedded in the central portion of the elevating tray 21d on the downstream side in the feeding direction in the width direction so that the loading surface and the upper surface are substantially the same plane. Further, on the downstream side of the separation pad 21b in the feeding direction, a document presence / absence sensor 21a for detecting the presence / absence of the document D on the elevating tray 21d is arranged. As shown in FIGS. 4 and 5, the sensor main body of the document presence / absence sensor 21a is arranged below the elevating tray 21d, and wiring connected to the sensor main body is arranged. A sensor cover 21k that covers the sensor body and a part of the wiring is attached to the lower surface of the elevating tray 21d.

Further, a plurality of tip portions 21s having a comb tooth shape are integrally formed at the downstream end portion of the elevating tray 21d in the feeding direction. Then, as shown in FIGS. 4 and 5, a plurality (two) sliding portions 21m are integrally formed on the lower surface of the elevating tray 21d in a form offset from the tip portions 21s at different positions in the width direction. Be prepared for. These sliding portions 21m are formed so that the lower side has a semi-cylindrical shape.

[Shape and operation of guide member]
Subsequently, the guide member 34 that guides the vertical position of the elevating tray 21d when the loading tray 21 is rotated will be described with reference to FIGS. 7 (a) to 7 (d). In addition, in FIGS. 7A to 7D, in order to explain the rotation angle, it is virtual from the center O of the first rotation shaft 21g to the upper end on the downstream side of the side wall portion 21n in the feeding direction. The lines A1 to A3 will be shown and described.

As described above, the device main body 10 of the ADF1 is formed with the discharge port 25 (see FIG. 2), and as shown in FIGS. 7 (a) to 7 (d), the device main body 10 has the discharge port 25. An ejection guide member 26 that forms an ejection space for loading the ejected document D is provided above. The upper surface of the discharge guide member 26 is an installation surface 26a on which the guide member 34 is installed, that is, the guide member 34 is erected so as to protrude from the installation surface 26a.

The guide member 34 is composed of a plate-shaped rib integrally formed with the discharge guide member 26, and its upper surface is configured as a sliding portion 34A on which the sliding portion 21m of the elevating tray 21d described above slides. Has been done. The sliding portion 34A has a seating surface 34a, a first inclined surface 34b as a first surface, and a second inclined surface 34c as a second surface from the downstream side in the feeding direction of the document D. They are formed so that they are continuously connected. In particular, the first inclined surface 34b and the second inclined surface 34c are configured to be connected by a curved surface portion 34d formed in a curved surface shape that is arcuate when viewed from the width direction.

As described above, the seating surface 34a of the guide member 34 is separated from the slidable portion 21m when the elevating tray 21d is rotated by the elevating plate 22 and raised (see FIG. 6B), and the elevating tray 21d The sliding portion 21m is seated when the sliding portion is lowered. In the present embodiment, the seating surface 34a is formed on an inclined surface that rises toward the upstream side in the substantially horizontal direction or slightly in the feeding direction. However, regardless of the shape and angle of the seating surface 34a, it is sufficient that the lowermost position in the rotation direction when the elevating tray 21d is lowered can be positioned. Although the seating surface 34a is described as being formed on the guide member 34, the installation surface 26a itself of the discharge guide member 26 may be used. Further, as shown in FIG. 7A, when the loading tray 21 is at the lowermost position, a virtual line from the center O of the first rotation shaft 21g to the upper end on the downstream side of the side wall portion 21n in the feeding direction. Is at the position of the virtual line A1.

The first inclined surface 34b extends in a direction inclined at a first angle with respect to the horizontal direction so that the upstream side in the feeding direction is upward from the seating surface 34a. In other words, the loading tray 21 rotates upward. It is formed so that the elevating tray 21d moves upward when it is lifted. As shown in FIG. 7B, the first inclined surface 34b has a slidable portion 21m in the first rotation range x1 from the virtual line A1 to the virtual line A2 when the loading tray 21 is at the lowermost position. It slides while abutting and guides the elevating tray 21d upward.

The second inclined surface 34c extends in a direction inclined at a second angle smaller than the first angle with respect to the horizontal direction so that the upstream side in the feeding direction is upward, and the loading tray 21 is rotated upward. The elevating tray 21d is formed so as to move slightly upward at the time. As shown in FIG. 7D, the second inclined surface 34c slides on the loading tray 21 while the sliding portion 21m is in contact with the second rotation range x2 from the virtual line A2 to the virtual line A3. , Guide the elevating tray 21d slightly upward. In the present embodiment, the second inclined surface 34c is also inclined upward with respect to the horizontal direction, but it may extend in the horizontal direction.

From the state shown in FIG. 7A, for example, when the user tries to take out the document D discharged to the discharge tray 23 and lifts the upstream side of the loading tray 21 in the feeding direction upward, the loading tray 21 rotates first. It rotates around the center O of the shaft 21g as a fulcrum. When the loading tray 21 is rotated upward in this way, the tip portion 21s of the elevating tray 21d is on the downstream side in the feeding direction with respect to the first rotation shaft 21g, so that if there is no guide member 34, the tip portion 21s is downward. I will head. However, as shown in FIG. 7B, the slidable portion 21m is guided upward by the first inclined surface 34b. Therefore, when the loading tray 21 is rotated upward, the elevating tray 21d rotates upward with respect to the rotating loading tray 21 with the second rotation shaft 21j as a fulcrum, and particularly the tip. The portion 21s is pushed upward in the form of a rapid rise. As a result, the tip portion 21s and the sensor cover 21k are prevented from interfering with the installation surface 26a of the discharge guide member 26.

When the loading tray 21 is further rotated, the slidable portion 21m smoothly rides over the curved surface portion 34d, and the slidable portion 21m is guided to the second inclined surface 34c as shown in FIG. 7C. To. As described above, if the guide member 34 is not provided, the tip portion 21s of the elevating tray 21d will be directed downward, but since the sliding portion 21m is guided upward or horizontally by the second inclined surface 34c, the tip portion is The portion 21s is maintained at a position above the horizontal. Therefore, similarly, the tip portion 21s and the sensor cover 21k are prevented from interfering with the installation surface 26a of the discharge guide member 26. When the sliding position of the sliding portion 21m moves from the first inclined surface 34b to the second inclined surface 34c, it is smoothly moved by the curved surface portion 34d, so that the operating force of the loading tray 21 does not change suddenly. Does not cause discomfort to the operator.

Then, as shown in FIG. 7D, when the loading tray 21 is rotated to the uppermost position, the stopper portion 21i formed on the arm portion 21h hits the regulation portion (not shown) of the apparatus main body 10. In contact with each other, the loading tray 21 is regulated so as not to rotate upward any more. That is, the stopper portion 21i has a predetermined gap (clearance) between the upper surface of the elevating tray 21d and the upper end 11a forming the upper side of the opening 10A of the device cover 11 by contacting the regulating portion of the device main body 10. Is configured to exist. As a result, the elevating tray 21d is prevented from interfering with the device cover 11, and the elevating tray 21d and the device cover 11 are protected.

When the loading tray 21 is rotated downward by the user from the position shown in FIG. 7D, it only moves in the opposite direction on the same locus as when ascending, and thus the description thereof will be omitted.

As described above, in the ADF1 according to the present embodiment, the sliding portion 21m of the elevating tray 21d is guided by the first inclined surface 34b and the second inclined surface 34c in the sliding portion 34A of the guide member 34. As a result, it is possible to prevent the tip portion 21s of the elevating tray 21d and the sensor cover 21k from interfering with the discharge guide member 26 of the apparatus main body 10 when the loading tray 21 is rotated.

In the present embodiment described above, the ADF1 has been described as an example of the sheet feeding device, but the present invention is not limited to this, for example, an elevating tray in which the manual feed tray for manually feeding the sheet to the image forming unit 119 moves up and down. It can also be applied to cases such as having.

Further, in the present embodiment, the guide member 34 formed on the discharge guide member 26 as a plate-shaped rib has been described, but the present invention is not limited to this, and the guide member is separately attached to the discharge guide member. It does not have to be plate-shaped. That is, the sliding portion 34A and the sliding portion 21m of the guide member 34 are offset from the tip portion 21s of the elevating tray 21d, the sensor cover 21k, the elevating plate 22, and the like at different positions in the seat width direction. Any shape may be used as long as it is arranged so as not to interfere with each other.

Further, in the present embodiment, the sliding portion 34A of the guide member 34 provided with two inclined surfaces, a first inclined surface 34b and a second inclined surface 34c, has been described. However, the present invention is not limited to this, and if there is a portion having a function such as the first inclined surface 34b and the second inclined surface 34c, for example, three or more inclined surfaces may be formed. Further, although the first inclined surface 34b and the second inclined surface 34c are linear when viewed from the seat width direction, they may be formed so as to be appropriately curved.

Further, in the present embodiment, the shape of the tip portion 21s of the elevating tray 21d has been described as having a comb-teeth shape, but the present invention is not limited to this, and any shape as long as it does not interfere with the guide member 34 is described. It may be. For example, it may be formed in a plate shape and may have a groove through which the plate-shaped guide member 34 passes.

Further, in the present embodiment, the document presence / absence sensor 21a is attached to the lower surface of the elevating tray 21d, but the present invention is not limited to this, and the document presence / absence sensor 21a may be attached to the installation surface 26a of the discharge guide member 26. .. In this case, the sliding portion 34A may be formed by the guide member 34 so that the tip portion 21s of the elevating tray 21d does not interfere with the document presence / absence sensor 21a.

1 ... Sheet feeding device (ADF): 10 ... Device body: 10A ... Opening: 21 ... Sheet loading means (loading tray): 21a ... Sensor (document presence / absence sensor): 21c ... Support means (support tray): 21d ... Elevating tray: 21i ... Stopper part: 21m ... Sliding part: 21k ... Sensor cover: 22 ... Elevating means (elevating plate): 23 ... Discharge loading means (discharge tray): 26a ... Installation surface: 27 ... Image reading unit: 29a ... Feeding means (pickup roller): 31 ... Image reading unit: 34 ... Guide member: 34A ... Sliding part: 34b ... First surface (first inclined surface): 34c ... Second surface (second inclined surface) : 101 ... Image forming apparatus (printer): 103 ... Image reading device: 119 ... Image forming unit: x1 ... First rotation range: x2 ... Second rotation range

Claims (8)

A sheet loading means including an elevating tray that can move up and down on the downstream side in the feeding direction of the loaded sheet, and a supporting means that rotatably supports the elevating tray and is rotatably supported by the apparatus main body. ,
Lifting means for raising and lowering the lifting tray and
A feeding means for feeding the seat of the lifting tray raised by the lifting means, and a feeding means.
The elevating tray is slid by a sliding portion that is erected so as to protrude from the installation surface of the apparatus main body and slides the slided portion of the elevating tray when the support means is rotated. It is equipped with a guide member that guides the part.
The sliding part is
The support means abuts on the sliding portion in a state where it is located in the first rotation range which is above the lowermost position in the rotation direction, and is above the state where the support means is at the lowermost position in the rotation direction. The first surface that guides the sliding portion so as to face
The supporting means abuts on the sliding portion in a state of being located in the second rotation range which is above the first rotation range in the rotation direction, and is located above the first surface. It has a second surface for guiding the sliding portion as described above.
A sheet feeding device characterized by that. The first surface extends in a direction inclined at a first angle with respect to the horizontal direction.
The second surface extends in a direction inclined at a second angle smaller than the first angle with respect to the horizontal direction, or extends in the horizontal direction.
The sheet feeding device according to claim 1, wherein the sheet feeding device is characterized in that. The sliding portion guides the sliding portion so that the elevating tray does not interfere with the installation surface when the supporting means is rotated.
The sheet feeding device according to claim 1 or 2. The support means has a sensor cover installed on the lower side of the elevating tray and accommodating a sensor for detecting the presence or absence of a seat and a part of wiring connected to the sensor.
The sliding portion guides the sliding portion so that the sensor cover does not come into contact with the installation surface when the seat loading means is rotated.
The sheet feeding device according to any one of claims 1 to 3, wherein the sheet feeding device is characterized. The device body has an opening for receiving the sheet inside.
The elevating tray is arranged so that a part thereof is inserted into the opening.
The support means has a stopper portion that abuts on the device main body and regulates upward rotation when rotated to the uppermost position.
A gap exists between the upper end of the opening and the elevating tray in a state where the support means is rotated to the uppermost position.
The sheet feeding device according to any one of claims 1 to 4, wherein the sheet feeding device is characterized. The sheet feeding device according to any one of claims 1 to 5.
An image reading unit for reading an image of a sheet fed by the sheet feeding device is provided.
An image reader characterized by this. A discharge loading means, which is arranged below the support means and loads a document that has been ejected by reading an image by the image reading unit, is provided.
The image reading device according to claim 6. The image reading device according to claim 6 or 7,
An image forming unit for forming an image read by the image reading device on another sheet is provided.
An image forming apparatus characterized in that.

Images