JP2015074504A - Sheet housing device and image formation device equipped with sheet housing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of possibility that an overloading state occurs when a sheet is loaded by alignment with a loading limit index provided at a side regulation member in a state where the side regulation member is spread.SOLUTION: An auxiliary support part 3b having the same height with a tray 2 is provided near a loading limit index 5, thus, overloading increase is prevented which is caused by the fact that a bottom surface of a sheet falls by a cut 2b of the tray 2.

Description

  The present invention relates to a sheet storage device that stores sheets and an image forming apparatus including the sheet storage device.

  2. Description of the Related Art Conventionally, an image forming apparatus such as a printer or a copying machine includes a sheet storage device that stores a sheet on which an image is formed. The sheet stored in the sheet storage device is fed to form an image on the sheet.

  The sheet storage device includes a tray (middle plate) on which sheets are stacked, a rear end regulating member and a side regulating member that regulate the position of the sheet on the tray.

  These restricting members are provided so as to be movable so as to correspond to various sheet sizes. The tray moves up and down according to the stacking amount so that the height position of the uppermost sheet is constant. The restricting member and the tray can be moved (lifted / lowered) independently so as not to increase the size of the apparatus. Therefore, the tray is provided with a notch portion to ensure the movement range of the restricting member.

  For example, in a large-sized printer that can handle a large size such as 13 × 19 inches, it has been required to support a small-size sheet such as a postcard. On the other hand, in order to prevent sheet misalignment and skew during sheet feeding, the side regulating member needs to abut on the side edge of the sheet as long as possible. Therefore, in order to satisfy the function, the notch is inevitably enlarged.

  If such a large cutout is formed in the tray, the tray may bend due to the cutout, the stacked sheets may be deformed, and the sheets may not be stacked stably. Patent Document 1 discloses an apparatus in which an auxiliary paper stacking plate that covers a notch and that is movably provided on a tray is interlocked with the movement of a regulating member.

JP 58-17028 A

In the configuration of Patent Document 1, it is possible to cover the notch portion of the tray, but the structure becomes complicated.
Accordingly, an object of the present invention is to realize stable sheet feeding with a simple configuration.

  The sheet storage device of the present invention includes a notch, a sheet support means for supporting the sheet, and a movable portion so as to be able to enter the notch, and the position of the end portion of the sheet supported by the sheet support means is determined. A regulating means for regulating, and an auxiliary support portion that is provided at a position corresponding to the notch in the regulating means and supports the sheet at substantially the same height as the sheet supporting means.

  According to the present invention, sheets can be stably stacked with a simple configuration.

An image forming apparatus according to an embodiment of the present invention. The perspective view and top view of a storage cassette. Sectional drawing of the state which expanded and narrowed the side control member. The perspective view and upper view which show 2nd Embodiment. The perspective view and upper view of a comparative example. Sectional drawing of the state which expanded and narrowed the side control member in the comparative example.

  FIG. 1 is a front view of an image forming apparatus 100 as an example of an embodiment according to the present invention.

  A storage cassette 1 serving as a sheet storage device that stores sheets in a stacked state is provided in the image forming apparatus 100 so that the storage cassette 1 can be pulled out toward the front of the apparatus main body 102. The storage cassette 1 is provided so that a user can set paper, OHT, or the like as a sheet on which an image is formed. Sheets are supplied to the storage cassette 1 in a state where the storage cassette 1 is pulled out to the front side of the image forming apparatus 100. In the present embodiment, three storage cassettes 1 having the same configuration are provided side by side.

  The sheet stored in the storage cassette 1 is fed from the uppermost sheet by a feeding mechanism 15 including a feeding roller disposed in the apparatus main body 102. An image is formed on the sheet fed by the feeding mechanism 15 by the image forming unit 101. For example, an image is formed on a sheet based on image information read by an image reading unit provided in the image forming apparatus 100 or image information transmitted to the image forming apparatus 100 from an external connection cable.

  Next, the storage cassette 1 will be described in detail.

(First embodiment)
FIGS. 2A and 2B are a perspective view and a top view of the storage cassette. Each of FIGS. 3A and 3B shows a cross-sectional view of the storage cassette 1 with the side regulating member narrowed and widened.

  The storage cassette 1 includes a main body case 1 a, a tray (support member) 2 that supports stacked sheets on a support surface on the upper surface, side restriction members 3 and 4, and a rear end restriction member 12.

  The tray 2 as the sheet support means is supported by the main body case 1a so as to be rotatable about the rotation shaft 1b. In the tray 2, notches 2 a are formed on both sides in the width direction orthogonal to the sheet conveyance direction 80.

  The tray 2 is moved up and down by a lift-up mechanism 103 (see FIG. 1) provided in the apparatus main body 102. That is, the position in the height direction of the tray 2 is adjusted by the lift-up mechanism 103 so that the uppermost sheet on the tray 2 becomes a position suitable for feeding by the feeding mechanism 15. When the storage cassette 1 is pulled out, the engagement with the lift-up mechanism 103 is released, and the tray 2 moves to its lower limit position shown in FIG.

  The side regulating members 3 and 4 abut against the end of the sheet stacked on the tray 2 in the width direction orthogonal to the conveyance direction 80 to regulate the position of the sheet. The side regulating member 3 and the side regulating member 4 are supported so as to be slidable on the main body case 1a so as to move in opposite directions in conjunction with a rack portion and a pinion described later.

  The side regulating members 3 and 4 are movably provided at positions corresponding to the size of the stacked sheets. The tray 2 is set to have a length in the width direction in accordance with the dimension in the width direction of the largest sheet among the stackable sheet sizes. Therefore, when stacking sheets smaller than the maximum size sheet, it is necessary to move the side regulating member 3 into the tray 2, and the tray 2 has a notch portion so as not to interfere with the side regulating member 3. 2a is formed. Further, the notch portion 2a is set to have a dimension in the width direction in accordance with the dimension in the width direction of the smallest sheet among the stackable sheets. When a small-sized sheet is stacked, the side regulating members 3 and 4 are inserted into the notch 2a to regulate the end of the sheet. In this way, by forming the notch 2a in the tray 2, it is possible to restrict the position of the side edges of all sheets with respect to the stackable sheet size.

  The side regulating member 3 includes a main body 30 that extends in the vertical direction and contacts the end of the sheet in the width direction, and an end support 3 a that extends in the horizontal direction from the lower portion of the main body 30. The main body 30 is set to be long in the conveyance direction 80, and more reliably prevents the sheet sent from the tray 2 in the conveyance direction 80 from being inclined. The end support 3a is formed at a right angle to the main body 30 so that the main body 30 of the side regulating member 3 is perpendicular to the bottom surface of the main body case 1a. The end support portion 3a supports a part of the lower surface of the set sheet.

  On the upper surface of the end support portion 3a, an auxiliary support portion 3b that protrudes upward and supports the lower surface of the stacked sheets is provided. The height position of the auxiliary support portion 3b is set to be substantially the same height as the upper surface (support surface) of the tray 2 located at the lower limit position. Note that the end support portion 3a can support the lower surface of the sheet at a place other than the auxiliary support portion 3b, for example, at a location upstream of the auxiliary support portion 3b in the conveyance direction 80.

  The side regulating member 3 further includes a rack portion 31 that further extends in the horizontal direction from the end support portion 3a. The rack portion 31 extends below the tray 2. The end support portion 3 a and the rack portion 31 constitute an extending portion that extends in the horizontal direction from the main body portion 30 and at least a part of which can be positioned below the tray 2.

  The side restricting member 4 has the same configuration as the side restricting member 3 and includes an end support portion 4a, an auxiliary support portion 4b protruding upward from the end support portion 4a, and a rack portion 41.

  A pin-on gear (not shown) that meshes with the rack portion 31 of the side regulating member 3 and the rack portion 41 of the side regulating member 4 is provided below the tray 2. By being connected via the pinion gear, the side regulating member 3 and the side regulating member 4 are interlocked so as to move in opposite directions.

  A stacking limit index 5 indicating the position of the stacking limit of sheets is provided on the downstream side of the conveyance direction 80 in the main body 30 of the side regulating member 3. The position of the stacking limit index 5 in the conveyance direction 80 (the direction parallel to the upper surface of the tray 2 and intersecting the sliding movement direction of the side regulating member), and the conveyance of the auxiliary support portions 3b and 4b that support the sheet. The position in the direction 80 corresponds. That is, the auxiliary support portion 3 b that supports the sheet is provided immediately below the stacking limit index 5.

  The amount of sheets that can be stacked on the tray 2 is limited so that the stacked sheets do not exceed the height of the side regulating members 3 and 4 or the sheets do not interfere with the feeding mechanism 15 disposed on the storage cassette 1. It is necessary to keep. The loading limit index 5 is provided on the upper side of the side regulating member 3 that is easy for the user to see as a means for indicating the loading limit amount.

  3A and 3B are cross-sectional views of the storage cassette 1 with the side regulating members 3 and 4 narrowed and widened, respectively.

  As shown in FIG. 3B, even when the side regulating member 3 is expanded to fit the large size sheet S <b> 2, the auxiliary support portion 3 b is almost the same as the tray 2 on the sheet bottom surface near the stacking limit index 5. Support at the same height. Accordingly, the sheets can be stacked stably. Further, even when a large-size sheet S2 is set, the bottom surface of the sheet in the vicinity of the stacking limit index 5 does not fall. That is, by stacking sheets according to the stacking limit index 5 regardless of the size of the stacked sheets, it is possible to prevent the sheets from being stacked exceeding the maximum stacking capacity that can be stored in the storage cassette 1. The effect of preventing the loading exceeding the maximum loading capacity due to the provision of the auxiliary support portion 3b will be described in detail below in comparison with a comparative example.

<Comparative example>
5 and 6 show a configuration in which the auxiliary support portion is not provided as a comparative example. 5A and 5B are a perspective view and a top view, respectively, of a comparative example. Each of FIGS. 6A and 6B is a cross-sectional view showing a stacked state when the side regulating member 3 is narrowed to fit the small size sheet S1 and widened to fit the large size sheet S2.

  As shown in FIG. 6A, when the side regulating member 3 is narrowed according to the small size sheet S <b> 1, the tray 2 is on the bottom surface of the sheet S in the vicinity of the stacking limit index 5. Therefore, when the user sets sheets according to the stacking limit index 5, the stacking capacity near the side regulating member 3 (loading limit index 5) is the same as the maximum stacking capacity Hc that can be stored in the storage cassette 1. The sheet stacking height Tc in the vicinity of the feeding mechanism 15 is also substantially the same as the maximum stacking amount Hc (Tc = Hc). Therefore, the clearance Cc between the upper surface of the sheet S and the feeding mechanism 15 is sufficiently ensured as designed.

  On the other hand, as shown in FIG. 6B, when the side regulating member 3 is expanded in accordance with the large size sheet S2, the sheets may be overloaded as follows.

  That is, there is no tray 2 on the bottom surface of the sheet in the vicinity of the stacking limit index 5, and the bottom surface of the sheet in the vicinity of the stacking limit index 5 is lowered by the thickness t of the tray 2. When the user sets a sheet according to the stacking limit index 5, the stacking amount Ho is close to the side regulating member 3 (loading limit index 5) by the thickness t of the tray 2 than the maximum stacking amount Hc that the storage cassette 1 can store. Increased (Ho = Hc + t). This means an overloading state where the original maximum loading capacity Hc has been exceeded. Accordingly, the sheet stacking height To in the vicinity of the feeding mechanism 15 is also increased by the thickness t of the tray 2 (To = Ho = Hc + t). Therefore, the clearance Co between the upper surface of the sheet S and the feeding mechanism 15 is smaller than the design designation position by the thickness t of the tray 2 (Co <Cc).

  Therefore, when the storage cassette 1 is taken in and out of the apparatus main body 102, there is a possibility that a defect occurs in which the upper part of the sheet stacked on the feeding mechanism 15 contacts and interferes. Such a defect is more likely to occur when the sheet S is warped or curled. Further, in an overloaded state, there is a risk of causing a feeding failure such as folding or tilting of the sheet when feeding the sheet. In addition, in an overloaded state, there is a risk that problems such as sheet remaining on the apparatus main body may occur when the storage cassette is attached or detached.

  When a sufficient clearance between the feeding mechanism 15 and the uppermost surface of the sheet S is to be secured in order to avoid contact between the feeding mechanism 15 and the upper portion of the sheet S, the apparatus must be enlarged in the height direction. . This is particularly noticeable when a plurality of storages are provided in the height direction.

  For the above problem, it is conceivable to set the position of the stacking limit index 5 in anticipation that the end of the stacked sheets is lowered as shown in FIG. 6B. However, in this case, the amount of sheets that can be set is reduced while the side regulating member 3 is moved so as to regulate a small-sized sheet.

  Compared with the comparative example shown in FIGS. 5 and 6, in the present embodiment, as shown in FIG. 3, when matched with the stacking limit index 5, the sheet stacking amounts are small size sheet S1 and large size sheet S2. Be the same. Therefore, the sheets to be stacked can be within the maximum stacking amount regardless of the size. Therefore, there is little occurrence of overloading that the user unintentionally causes.

(Second Embodiment)
Next, the cassette provided in the sheet feeding apparatus according to the second embodiment of the present invention will be described.

  FIGS. 4A and 4B are a perspective view and a top view of the storage cassette shown in the second embodiment. Since the components other than the tray of the storage cassette 1 of this embodiment are the same as those of the first embodiment, the differences from the first embodiment will be described in detail.

  The present embodiment is different from the first embodiment in that the tray 2 shown in the first embodiment is provided with an escape portion 2b that allows the auxiliary support portions 3b and 4b to escape. Even if the auxiliary support portions 3b and 4b are added, by providing the escape portion 2b in the tray 2, it is possible to cope with a smaller size sheet while preventing overloading.

  As described above, overloading is prevented by stacking according to the stacking limit display regardless of the sheet size in the width direction, sheets can be stacked stably, and stable sheet feeding can be realized. .

DESCRIPTION OF SYMBOLS 1 Cassette 2 Tray 2a Notch 3 Side regulation member 3a End part support part 4 Side regulation member 4b Auxiliary support part 5 Loading limit index 15 Feed mechanism 100 Image forming apparatus

Claims (7)

A sheet support means provided with a notch and supporting the sheet;
Regulation means that is movable so as to be able to enter the notch, and regulates the position of the end of the sheet supported by the sheet support means;
A sheet storage device comprising: an auxiliary support portion provided at a position corresponding to the notch in the regulating means and supporting a sheet at substantially the same height as the sheet support means.   2. The sheet according to claim 1, further comprising: a limit index provided in the regulating means, the limit index indicating a limit of a height of a stacked sheet, and the auxiliary support portion is provided immediately below the limit index. Storage device.   The sheet storage device according to claim 1, wherein the restricting unit includes a support portion that supports a sheet, and the auxiliary support portion protrudes upward from the support portion.   The sheet storage device according to any one of claims 1 to 3, wherein the sheet support means includes an escape portion corresponding to the auxiliary support portion. A body case,
A support member supported by the main body case and supporting the sheet by a support surface;
A main body extending in a vertical direction to regulate an end portion of the sheet supported by the support member; and an extending portion extending in a horizontal direction from the main body, and is slidably movable. A regulating member supported by the body case;
An auxiliary support part that protrudes upward from the extension part of the restriction member and supports the sheet supported by the support member;
A position in a direction that intersects the moving direction of the restricting member and parallel to the support surface is provided in the restricting member in a direction corresponding to the position of the auxiliary support portion, and limits the height of the seat that is stored. A sheet storage device characterized by having an index to be indicated.   The sheet storage device according to claim 5, wherein the support surface and the auxiliary support portion have substantially the same height. A sheet storage device according to any one of claims 1 to 6,
An image forming apparatus comprising: an image forming unit that forms an image on a sheet stored in the sheet storage device.

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