JP2003040506A - Sheet discharge device and image forming device - Google Patents

Sheet discharge device and image forming device

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Publication number
JP2003040506A
JP2003040506A JP2001231787A JP2001231787A JP2003040506A JP 2003040506 A JP2003040506 A JP 2003040506A JP 2001231787 A JP2001231787 A JP 2001231787A JP 2001231787 A JP2001231787 A JP 2001231787A JP 2003040506 A JP2003040506 A JP 2003040506A
Authority
JP
Japan
Prior art keywords
sheet
tray
sheets
discharging
provided
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2001231787A
Other languages
Japanese (ja)
Inventor
Seiji Saito
聖治 斎藤
Original Assignee
Ricoh Co Ltd
株式会社リコー
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd, 株式会社リコー filed Critical Ricoh Co Ltd
Priority to JP2001231787A priority Critical patent/JP2003040506A/en
Publication of JP2003040506A publication Critical patent/JP2003040506A/en
Pending legal-status Critical Current

Links

Abstract

(57) [Problem] To provide a sheet discharge device having a configuration capable of eliminating a stacking defect with a simple configuration regardless of the number of stacked sheets. SOLUTION: In a sheet discharging apparatus having a tray having a sheet stacking surface inside a housing, a discharging roller 61 which rotates in a direction in which the sheet 42 can be discharged is provided at an entrance of the tray 60, and the discharging roller 61 A configuration 62 for enhancing the bending rigidity of the discharged sheet is provided on the entrance side of the tray.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet discharging device and an image forming apparatus.

[0002]

2. Description of the Related Art In an image forming apparatus such as a copying machine, a printer, a facsimile machine, or a printing machine, when an image formed on a photoconductor which is a latent image carrier is transferred to a recording sheet, the image is fixed. After that, a sheet such as transfer paper is ejected to a paper ejection tray or the like. As a configuration related to the paper ejection tray, a paper ejection tray that projects to the side of the image forming apparatus is often installed, but in this configuration, the occupied space required for installing the image forming apparatus including the paper ejection tray becomes large. There is a problem called. Therefore, a configuration has been proposed in which the function of the paper discharge tray is provided in a part of the image forming apparatus (for example, Japanese Patent Laid-Open No. 8-337347).

[0003]

Generally, the height of the image forming apparatus is set to the upper limit of the height of the document placing table in consideration of operability, and therefore, the paper discharge provided inside the apparatus. The space in the height direction of the tray is limited. Therefore, it is conceivable to increase the height in the paper discharge tray, but in the case of such a configuration, the height of the entire apparatus also becomes high, resulting in impairing operability.

FIGS. 12 to 14 are views for explaining a defect in the case of a structure in which a paper discharge tray is provided inside the apparatus, that is, a structure capable of discharging paper in the body. In FIG. 12, when a large number of sheets of transfer paper or the like are to be discharged onto the discharge tray A, the sheet receiver arranged below the discharge rollers B in the space allowed for the discharge tray A. It is conceivable to position the surface A1 as low as possible (position indicated by reference numeral H1 in FIG. 12) to secure the stacking thickness of the discharged sheets. Further, in order for the tip of the sheet discharged from the sheet discharge roller B to be smoothly landed on the sheet receiving surface A1 of the sheet discharge tray and stacked, the tip of the sheet discharged is close to the height of the sheet discharge roller B. It is desirable to move the sheet onto the sheet discharge tray A at a height (moving state at the level indicated by reference numeral L1 in FIG. 12). Under such a condition, the shape of the sheet receiving surface A1 in the paper discharge tray A may be such that the height of the sheet receiving surface A1 increases as the distance from the side where the paper discharge roller B is located increases, as shown in FIG. desirable. Further, in order to secure the specified number of sheets to be stacked, it is necessary to maintain the height (H2: H2 = H1) corresponding to the stacking height (H1) on the sheet discharge roller B side even at the leading end in the sheet discharge direction.

However, in such a shape of the sheet discharge tray A, the sheet receiving surface A1 of the sheet discharge tray A is located below the sheet discharge roller B, and the sheet receiving surface on the side away from the sheet discharge roller B is located. Since A1 is located above, the space for stacking sheets is at least H1.
And H2 are required to be added, which may increase the height of the device.

On the other hand, as shown in FIG. 13, in order to prevent the height of the apparatus from increasing in order to secure a predetermined number of sheets to be stacked, as shown in FIG. The height of the device is increased by sacrificing the height of the position where the tip lands and ensuring the height H2 of the loading space so that H1 and H2 overlap in the height direction of the device. It is possible to suppress it. However, in this configuration, when the sheet is discharged, the distance L1 to the position where the leading edge of the sheet is landed becomes long. Therefore, in the case of a discharged sheet, particularly a sheet in which a large amount of curl has occurred, the landing front end is pushed by the discharging force as shown in FIG. 14 to form an obtuse angle (indicated by θ1 in FIG. 14). When landed at, the tip will be rounded and loading failure will occur easily.

An object of the present invention is to provide a sheet discharging apparatus and an image forming apparatus having a structure capable of eliminating a defective stacking regardless of the number of stacked sheets with a simple structure in view of the above-described problems related to the sheet discharging. To do.

[0008]

The invention according to claim 1 is
In a sheet discharge device having a tray having a sheet stacking surface inside a housing, a discharge roller that rotates in a direction capable of discharging a sheet is provided at an entrance of the tray to improve bending rigidity of the sheet discharged by the discharge roller. It is characterized in that a strengthening structure is provided on the entrance side of the tray.

According to a second aspect of the present invention, the bending rigidity of the sheet is strengthened, and the sheet is disposed in the center of the sheet width direction corresponding to the direction perpendicular to the discharge direction of the sheet discharged by the discharge roller. In addition to a portion that passes through the discharge roller, a waisting member constituted by an arm that bends the sheet and directs the sheet toward the sheet receiving surface of the tray is provided at the center in the width direction of the tray. .

The invention according to claim 3 is characterized in that the lining member is capable of changing a bending rigidity strengthening state of the sheets according to the number of sheets stacked on the tray.

The invention as set forth in claim 4 is characterized in that the lumbar support member has a structure capable of changing the sheet discharge direction in accordance with the number of sheets stacked on the tray.

According to a fifth aspect of the present invention, the lumbar support member is swingably provided with a base end provided on the paper ejection tray side as a fulcrum, and the paper is ejected near the base end regardless of the rocking position. It is characterized in that it is provided with a bent portion which comes into contact with a curved sheet to be curved.

The invention according to claim 6 is characterized in that the waist mounting member is capable of detecting the full load state by detecting the stacking amount of the sheets discharged onto the tray.

The invention according to claim 7 is characterized in that the lumbar member is detachably provided to the entrance of the tray.

The invention according to claim 8 is characterized in that the lumbar support member can be housed in a position in the tray that does not interfere with the movement of the sheet.

According to a ninth aspect of the invention, the image forming apparatus is provided with the sheet discharging device according to any one of the first to seventh aspects.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to illustrated embodiments. FIG. 1 is a schematic diagram showing an example of an image forming apparatus in which a sheet discharging apparatus according to an embodiment of the present invention is used. The image forming apparatus shown in FIG. 1 is a compound machine having both functions of a copying machine and a printer. However, the image forming apparatus according to the present invention is not limited to this, and includes not only the facsimile apparatus or the composite function but also the single function.

In FIG. 1, the image forming apparatus is provided with an image reading section 3 for reading an image of a document at an upper portion, and an image forming section 1 is provided below the image reading section 3 with a space S (see FIG. 1) therebetween. It is located in the center of the device. Below the image forming unit 1, a paper feeding unit 2 capable of feeding sheets such as transfer paper is arranged.

As shown in FIG. 1, the image forming apparatus is provided with a manual sheet feeding stand 47 for manually feeding sheets on the right side surface of the image forming apparatus so as to be openable and closable. Manual feed stand 4
7 is normally housed in the image forming apparatus, and is used by turning it about the fulcrum 47J and tilting it as needed. From the front end side of the manual paper feed stand 47, an auxiliary stand 47a stored in the manual paper feed stand 47 is provided.
Can be withdrawn.

In the image forming section 1, a charging device 6 for charging the surface of the photoconductor 5 around the drum-shaped photoconductor 5 used as an image carrier, and a laser beam for image information on the surface of the photoconductor 5. An exposing device 7 for irradiating the surface of the photoconductor 5, and a developing device 8 for visualizing an electrostatic latent image formed by being exposed on the surface of the photoconductor 5.
A transfer device 9 that transfers the toner image developed on the photoconductor 5 to the sheet 42, a cleaning device 10 that removes and collects the toner remaining on the surface of the photoconductor 5 after the transfer, and the like are arranged.

The paper feed unit 2 is mainly provided with a paper feed cassette 21 for stacking and storing sheets 42 such as unused transfer paper. A backing sheet or the like may be set in the sheet feeding cassette 21. The paper feed cassette 21 is attachable to and detachable from the image forming apparatus from the front side of the apparatus, and improves operability and workability during sheet replenishment. Sheets 42 are stacked on the bottom plate 22 that is rotatably supported in the sheet feeding cassette 21, and a spring 24 presses the uppermost sheet 42 against the sheet feeding roller 23. In FIG. 1, reference numeral 23A indicates a friction pad for separating sheets. In the sheet feeding unit 2, when an image forming command is issued, the uppermost sheet 42
Is sent out from the paper feeding cassette 21 by the rotation of the paper feeding roller 23 and the separating action of the friction pad 23A, and the registration roller 1 provided in front of the transfer portion (position of the transfer device 9).
It is transported to 4. The conveyed sheet 42 is temporarily stopped from being conveyed by the registration rollers 14,
The toner image is copied with the timing set so that the positional relationship between the upper toner image and the leading edge of the sheet 42 becomes a predetermined position, and the toner image is copied when passing through the transfer portion.

In the image reading section 3, in order to read and scan an image of an original document (not shown) placed on the contact glass 32, an original illumination light source 43 and a plurality of mirrors 4 are provided.
The reading traveling body 31 made of 4M reciprocates. The image information scanned by the reading traveling body 31 is read as an image signal by a photoelectric conversion element 44 such as a CCD installed behind the lens 31a. The read image signal is digitized and image-processed. The image reading unit 3 forms an electrostatic latent image on the surface of the photoconductor 5 by the emission of a laser diode (not shown) of the exposure device 7 based on the image-processed signal. That is, the light from the laser diode reaches the photoconductor 5 via a known polygon mirror or lens, and forms an electrostatic latent image on the surface of the photoconductor 5. The electrostatic latent image moves with the rotation of the photoconductor 5, is visualized by the toner supplied from the developing device 8, and further moves toward the transfer device 9. Although not shown, an automatic document feeder for automatically feeding a document onto the contact glass is attached above the image reading unit 3. The automatic document feeder can be arbitrarily attached and detached and does not necessarily have to be installed in the image forming apparatus.

In the space S, a tray (hereinafter referred to as a paper discharge tray) 60 for accommodating the sheet 42 discharged from the fixing device 11 after fixing is arranged. In addition,
In FIG. 1, reference numeral 11A indicates a fixing roller equipped in the fixing device 11, and reference numeral 11B indicates a pressure roller.

FIG. 2 is a schematic diagram showing a first example of the embodiment of the present invention. In FIG. 2, the paper discharge tray 6
A discharge roller 61 including a pair of rollers capable of sandwiching and conveying the discharged sheet is provided at the entrance corresponding to the side where the sheet is discharged. The discharge rollers 61 are arranged at a plurality of positions along the width direction of the sheet corresponding to the direction perpendicular to the sheet discharge direction indicated by the arrow, and the rotation direction capable of discharging the sheet tangentially is set. There is.

Near the entrance of the discharge tray 60,
A waist attachment member 62 is provided at a position after the leading edge of the discharged sheet has passed the discharge roller 61. The waist attachment member 62 is located behind the discharge roller 61 in the sheet discharge direction, and as shown in FIG. 3, is made up of an arm that faces the upper surface of the sheet at the widthwise center of the sheet.
The stiffening member 62 has a base end supported on the upper surface side of the paper discharge tray 60, and a free end directs the sheet toward the sheet receiving surface 60A of the paper discharge tray 60 with an angle θ2 (see FIG. 2). It is provided in a tilted state.

Since this embodiment has the above-mentioned configuration,
The sheet 42 discharged by the discharge roller 61 comes into contact with the support member 62 when passing through the discharge roller 61. As shown in FIG. 3, the waist attachment member 62 can be curved downward in the widthwise central portion of the sheet 42 separately from the portion sandwiched by the discharge rollers 61. This allows
Since the sheet 42 is tensioned in the width direction and the bending rigidity in the discharge direction is enhanced, the sheet 42 is directed and moved at an acute angle θ2 with respect to the sheet receiving surface 60A of the discharge tray 60. . As a result, the sheet receiving surface 60A
Since the bending rigidity at the leading end of the sheet 42 that has reached the point is increased, the sheet 42 can move on the sheet receiving surface 60A without rolling when reaching the sheet receiving surface 60A.

Next, a second example according to the embodiment of the present invention will be described. FIGS. 4 and 5 are schematic diagrams for explaining the configuration of the second embodiment. In the embodiment shown in the same drawing, it is possible to change the bending rigidity enhancement state and the discharge direction according to the number of stacked sheets. It has a feature.

In FIG. 4, a waist attachment member (indicated by reference numeral 62 'for convenience) is provided at a position similar to that of the embodiment shown in FIG. 2, and is composed of an arm swingable from the base end as a starting point. There is. On the way from the base end to the free end, a bent portion 62A is provided at a position where it can contact the sheet discharged from the discharge roller 61 regardless of the swing angle.
The shape is such that the position of the free end is higher than the base end in the horizontal direction with the bent portion 62A as the boundary.

Since this embodiment has the above-mentioned configuration,
When the number of sheets stacked on the sheet receiving surface 60A of the sheet discharge tray 60 is small, the waist attachment member 62 'falls down toward the sheet receiving surface 60A. Therefore, the sheet discharged from the discharge roller 61 comes into contact with the bent portion 62A and is bent downward in the widthwise central portion, while the leading end of the sheet 42 moving in the bent state is bent from the bent portion 62A. When separated, it moves from the position of the bent portion 62A toward the free end of the waist attachment member 62 '. At this time, the waist attachment member 62 '
Since the free end of the sheet is deviated from the extension line of the base end with the bent portion 62A as a boundary, the sheet 42 moves immediately after contacting the bent portion 62A without contacting the free end of the lumbar support member 62 '. can do. As a result, as shown by the chain double-dashed line in FIG. 4, the sheet 42 that has passed through the discharge roller 62 hangs downward as in the case where the bent portion 62A is eliminated and the shape of the mere linear member is formed. Therefore, the leading end of the sheet 42 is directed toward the sheet receiving surface 60A.

On the other hand, when the number of sheets stacked on the sheet receiving surface 60A increases, the waist attachment member 62 'rises in conjunction with the free end rising from the state shown in FIG. 4 as shown in FIG. For this reason, the position of the bent portion 62A of the waist attachment member 62 'is also displaced upward, and the discharge position of the sheet from the discharge roller 61 is unchanged, so that the position facing the discharged sheet is changed. However, this causes the downward pressing force on the discharged sheet 42 to change.

As the number of stacked sheets increases, the stacking height of the sheets 42 also increases. Therefore, the stacked sheets 42
The free end of the stiffening member 62 'resting on the upper surface of the will approach in the horizontal direction. Therefore, the sheet 42 curved by the bent portion 62A changes the discharging direction when being guided by the free end of the waist attachment member 62 'whose swing position is changed in proportion to the number of stacked sheets (Fig. 5, change from the direction indicated by the chain double-dashed line to the direction indicated by the solid line). As a result,
When the number of loaded sheets increases and the loading height increases,
Since the discharged sheet is guided by the free end of the waist attachment member 62 'at the height position corresponding to the stacking height, the sheet is stacked on the uppermost sheet-like surface of the stacked sheets without hanging down midway. Will be loaded.

In the present embodiment, the weight of the waist member 62 'which swings so as to approach the horizontal direction in proportion to the number of loaded sheets is
The weight of the newly discharged sheet 42 is set so that the discharged sheets are not displaced in the discharging direction. This prevents the ejected sheet from being pushed when the ejected sheet is rubbed by the movement of the newly ejected sheet, and prevents the leading end positions from becoming uneven between the sheets. it can.

Next, still another example according to the embodiment of the present invention will be described. The embodiment shown in FIG. 6 is characterized in that it is possible to detect the number of stacked sheets by means of a waist attachment member. In FIG. 6, the waist attachment member 62 ′ is an arm that can be swung about the base end as a fulcrum similarly to the configuration shown in FIG. 4, and a protrusion 62B is provided on the base end side.
A stacking state detection sensor 63, which is an optical sensor provided in a housing portion (not shown) of the paper discharge tray 60, is arranged at a position facing B. The stacking state detection sensor 63 can output a signal that warns that the sheets 42 stacked on the paper discharge tray 60 are full when the sheets are shielded from light by the protrusions 62B of the mounting member 62 ′.

Since the present embodiment has the above-described structure, as shown in FIG.
In the non-full load state, the protrusion 62B of the waist attachment member 62 'does not shield the loaded state detection sensor 63 from light. When the full load state in which the sheets 42 overflow from the sheet discharge tray 60 is reached, the waist attachment member 62 'approaches the horizontal direction according to this state, and the projection 62B is in the loaded state, as described in the description with reference to FIG. The detection sensor 63 is shielded from light. As a result, it is possible to warn that the discharge tray 60 is full of sheets. If the discharge operation is stopped in response to this warning, it is possible to prevent the sheets from becoming stuck. Therefore, so-called defective discharge can be prevented.

Next, another example according to the embodiment of the present invention will be described. The embodiment shown in FIG. 7 is characterized in that the waist attachment member is provided detachably from the paper discharge tray.
In FIG. 7, the waist attachment member 62 ′ is swingably provided with the base end as a fulcrum as in the case shown in FIG.
A pair of support pins 62C having an axial direction in the width direction of the seat 42 are provided at the base end.

A support member 64 having a receiving portion 64A into which the support pin 62C can be inserted and removed is provided on a wall portion (not shown) of the paper discharge tray 60.

Since this embodiment has the above-mentioned structure,
The support member 62 'can be used by being attached to the support member 64 when the function of enhancing the bending rigidity of the seat is to be exerted. Therefore, depending on the paper type of the sheet 42, when a type for which bending rigidity is not required to be strengthened, such as a thick sheet, is discharged, or when it becomes an unnecessary component for some users, the support member 64 is attached to the waist. The member 62 'is removed. As a result, it is possible to provide the lumbar support member 62 'as a retrofit component, so that it is possible not only to reduce the user's burden of purchasing the device, but also to increase the bending rigidity unlike a thick sheet or the like. When a sheet is used, it is possible to prevent the lumbar support member 62 'from interfering with the discharge of the sheet and enable smooth discharge. In addition, it is possible to prevent the waist attachment member 62 ′ from being inadvertently touched and damaged when the stacked sheets 42 are taken out by removing the waist attachment member 62 ′.

Next, still another example according to the embodiment of the present invention will be described. The embodiment shown in FIGS. 8 to 11 is characterized in that the swingable waist member can be maintained in a state of being contrasted with the sheet discharge path. In FIG. 8, a waist attachment member 62 ′ that can swing about the base end as a fulcrum, as in the configuration shown in FIG. 4, has a sheet discharge path (shown by a chain line in FIG. 8), as shown in FIG. It can be fixedly held in the position retracted from.

FIG. 9 is a view for explaining the structure of the base end of the waist attachment member 62 '. In the same figure, the waist attachment member 6 is shown.
At the base end of 2 ', a support piece 62D protruding in the extension direction of the waist attachment member 62' is provided, and the support piece 62D includes:
A protruding member 62E protruding in the width direction of the seat is fixed. In the present embodiment, the projecting member 62E is formed of a spherical body, which allows the base end to be swung in the vertical direction and allows the projecting member 62E to fall over the supporting piece 62D with the cross-sectional center as the fulcrum. It can be rotated clockwise or counterclockwise.

A support member 65 for supporting the base end is provided on the wall portion (not shown) of the paper discharge tray 60 on which the base end of the waist attachment member 62 'is supported. Support member 65
Is a cylindrical body that is tapered from the base fixed to the wall to the tip, and has a slit 65A in the vertical direction and a radial outside in the horizontal direction with the center in the circumferential direction of the cylindrical body as a base point. A pair of protruding concave portions 65B is formed. The inside of the support member 65 is formed in such a size that the projecting member 62E of the waist mounting member 62 'can be fitted and rotated.

The slit 6 formed in the support member 65
As shown in FIG. 10 (A), 5A is a waist attachment member 62 '.
When the support member 62D of FIG.
It can be swung in the up-and-down direction with the plane of 0 (A) as a fulcrum, and the concave portion 65B fits the support piece 62D of the lumbar support member 62 'as shown in FIG. 10 (B). be able to.

In the state shown in FIG. 10A, the waist attachment member 62 'can swing on the free end side.
In the state shown in (B), the waist attachment member 62 'can be maintained in a state in which it cannot be swung. In addition, in FIG.
In order to clearly show the fitting state between the protruding member 62E of the pressing member 62 'and the inside of the support member 65, the outer diameter of the protruding member 62E is shown small for convenience, but in reality, rotation is possible with less resistance. The dimensional relationship is set.

Since this embodiment has the above-mentioned structure,
As shown in FIG. 11, the lumbar support member 62 ′ includes the support member 6
By inserting the support piece 62D into the slit 65A of No. 5, the projecting member 62E enters the inside of the support body 65, and the base end is supported by the support member 65 in a state in which it is prevented from falling. When the bending rigidity is enhanced with respect to the discharged sheet 42, the supporting member 62 ′ is attached to the supporting piece 62 ′.
By swinging D while facing the slit 65A of the support member 65, it is possible to exhibit the same bending rigidity enhancing function as the configuration shown in FIGS. 4 to 7 described above.

On the other hand, in order to maintain the state in which the waist attachment member 62 'is retracted from the discharge path of the sheet 42, the waist attachment member 62' is rotated clockwise or counterclockwise.
This state is the state shown in FIG. 10 (B), in which the support piece 62D of the lumbar support member 62 'has the concave portion 65B of the support member 65.
Fit inside. As a result, the support member 62 'can be kept in a state in which it cannot be swung, and as shown in FIG.

When the lumbar support member 62 'in the retracted state is used again for strengthening the bending rigidity of the seat, the base end of the lumbar support member 62' in the state shown in FIG. Alternatively, the support piece 62D of the lumbar support member 62 ′ is rotated counterclockwise so that the support member 62 ′ has the slit 65A of the support member 65.
By allowing them to face each other, the lumbar support member 62 'is allowed to swing.

In the above-described embodiment, since it is possible to prevent the setting of the flexural rigidity from being enhanced and the obstruction of discharge by the lumbar support member 62 or 62 'simply by providing the lumbar support member 62 or 62'. Open 2000
Unlike the configuration disclosed in the above-mentioned publication, there is no need for a configuration for raising the receiving surface of the sheet in addition to a member for pressing the upper surface of the sheet, as disclosed in Japanese Patent Publication No. 118411. With the simple configuration, it is possible to obtain the above-described operation.

[0047]

According to the inventions of claims 1 and 2,
The bending rigidity of the sheet discharged onto the tray, in particular, the bending rigidity can be increased by bending the center in the sheet width direction separately from the other parts, so that the sheet does not curl up in the discharging direction. You can As a result, it becomes possible to eliminate a stacking failure caused by the fact that the leading edge of the sheet curls and collides with the sheet receiving surface so that the sheet easily rolls.

According to the third aspect of the present invention, since the bending rigidity strengthening state can be changed according to the number of stacked sheets to be discharged, it is possible to impart appropriate bending rigidity to the sheets according to the number of stacked sheets. You can As a result, the number of stacked sheets, that is, the deformation of the sheet front end due to the impact when the sheet front end abuts is changed according to the change in the abutting position, and thus the defective loading can be eliminated.

According to the fourth aspect of the present invention, since the discharge direction of the sheets can be changed according to the number of stacked sheets, the deformation of the discharged sheet leading edge such that the leading edge is rounded with respect to the stacked sheets is performed. A form of discharge that does not occur can be adopted. As a result, it becomes possible to smooth the sliding when the leading edge of the discharged sheet hits the stacked sheets and eliminate defective stacking.

According to the fifth aspect of the present invention, since the waist-providing member provided so as to be swingable is provided with the bent portion that can be bent by contacting the seat regardless of the rocking position. Even if the rocking position changes depending on the number of stacked sheets, the bending rigidity of the sheet can be strengthened, and the bending size of the sheet can be changed depending on the rocking position of the bending portion to change the bending rigidity strengthening state. As a result, it is possible to prevent the sheets from being directed downward as the number of stacked sheets increases, and it is possible to eliminate stacking failure of the sheets that tends to occur when the sheets are directed downward, and it is possible to eliminate defective loading. Become.

According to the sixth aspect of the present invention, since the loading state can be detected by the bending member which is the bending rigidity reinforcing member of the sheet, the bending rigidity reinforcing member can also be used for the detection at the time of full loading. As a result, different functions can be configured with a single member, and the configuration can be simplified.

According to the seventh aspect of the invention, since the waist attachment member can be attached and detached, the installation form can be selected. As a result, it is possible to prevent defective loading due to enhanced bending rigidity in accordance with the number of loaded sheets, and to remove the defective sheets before shipping them, thereby reducing the burden of purchasing parts on the user.

According to the invention as defined in claim 8, since it is possible to select a mode in which the bending rigidity of the sheet is not enhanced and this function is not necessary, it is possible to prevent the discharge of the sheet when it is not necessary. As a result, it is possible to prevent the sheet stacking failure and the sheet discharge failure.

According to the ninth aspect of the present invention, it is possible to prevent the stacking failure of the sheets discharged after the image formation by only the supporting member. Therefore, it is possible to discharge the sheets without the stacking failure with a simple structure. be able to.

[Brief description of drawings]

FIG. 1 is a schematic diagram illustrating an example of an image forming apparatus including a sheet discharging device according to an exemplary embodiment of the present invention.

FIG. 2 is a schematic diagram for explaining a configuration used in an example of the sheet ejection device according to the embodiment of the present invention.

FIG. 3 is a partial perspective view for explaining a configuration of a main part of the sheet discharging device shown in FIG.

FIG. 4 is a schematic diagram for explaining a configuration used in another example of the sheet ejection device according to the embodiment of the present invention.

FIG. 5 is a schematic diagram for explaining one aspect of another embodiment shown in FIG.

FIG. 6 is a partial perspective view for explaining a main part of a configuration used in still another example of the sheet discharging device according to the embodiment of the present invention.

FIG. 7 is a partial perspective view for explaining a main part of a configuration used in another example of the sheet discharging device according to the embodiment of the present invention.

FIG. 8 is a schematic diagram for explaining one aspect of a configuration used in still another example of the sheet ejection device according to the embodiment of the present invention.

FIG. 9 is a partial perspective view for explaining a configuration for obtaining the aspect shown in FIG.

FIG. 10 is a cross-sectional view taken along the arrow indicated by reference numeral (10) in FIG. 9, in which (A) shows the swingable state of the waist mounting member,
Each of (B) shows a state of being stored in the retracted position.

FIG. 11 is a view showing a detached state of the waist attachment member shown in FIG.

FIG. 12 is a schematic diagram showing an example of a configuration in which a paper discharge tray is provided inside a housing.

FIG. 13 is a schematic diagram for explaining a conventional example used for solving the problem in the configuration shown in FIG.

FIG. 14 is a schematic diagram for explaining a defect in the configuration shown in FIG.

[Explanation of symbols]

42 sheets such as transfer paper 60 paper discharge tray 61 discharge rollers 62, 62 'waist mounting member 62A bent portion 62B projection 62C provided on the waist mounting member support pin 62D provided on the waist mounting member 62D of the waist mounting member Support piece 62E provided at the base end Projecting member 63 provided on the support piece 63 Stacked state detection sensor 64 Support member 64A Support portion 65 of support pin 62B Support member 65A Slit 65B Concave portion

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 2H072 AA09 AA17 AA28 AB27 CA01                 3F048 AA02 AA04 AA05 AB01 BA04                       BB10 BC04 CB12 DA09 DC12                       EB40                 3F053 HA06 HB12 HB22 LA02 LA05                       LA07 LB03

Claims (9)

[Claims]
1. A sheet discharge device having a tray having a sheet stacking surface inside a housing, wherein a discharge roller that rotates in a direction capable of discharging a sheet is provided at an entrance of the tray, and the sheet is discharged by the discharge roller. A sheet discharging device, characterized in that a structure for strengthening the bending rigidity of the sheet is provided on the entrance side of the tray.
2. The sheet discharging device according to claim 1, wherein the bending rigidity of the sheet is strengthened, and the sheet is discharged from the discharging roller at a center in the sheet width direction corresponding to a direction perpendicular to the discharging direction. In addition to the portion that passes through the discharge roller, a waisting member constituted by an arm that bends the sheet and directs the sheet toward the sheet receiving surface of the tray is provided in the widthwise center of the sheet. A sheet discharging device.
3. The sheet discharging apparatus according to claim 1 or 2, wherein the waist mounting member can change a bending rigidity strengthening state of the sheets according to the number of sheets stacked on the tray. A sheet ejection device characterized by the above.
4. The sheet discharging apparatus according to claim 2 or 3, wherein the waist attachment member has a structure capable of changing a sheet discharging direction according to the number of stacked sheets discharged onto the tray. A sheet ejection device characterized by the above.
5. The sheet discharging apparatus according to claim 3 or 4, wherein the waist attachment member is swingably provided with a base end provided on the paper discharge tray side as a fulcrum, and is shaken near the base end. A sheet discharging device, which is provided with a bent portion that makes contact with a discharged sheet and bends regardless of the dynamic position.
6. The sheet discharging device according to claim 2, wherein the waist attachment member is capable of detecting a full load state by detecting a stacking amount of sheets discharged onto the tray. A sheet ejection device characterized by the above.
7. The sheet discharging apparatus according to claim 2, wherein the waist attachment member is detachably attached to an entrance of the tray. apparatus.
8. The sheet discharging apparatus according to claim 2, wherein the waist attachment member has a structure capable of being stored in a position in the tray that does not interfere with the movement of the sheet. A sheet ejection device characterized by the above.
9. An image forming apparatus comprising the sheet discharging device according to claim 1. Description:
JP2001231787A 2001-07-31 2001-07-31 Sheet discharge device and image forming device Pending JP2003040506A (en)

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Application Number Priority Date Filing Date Title
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006003649A (en) * 2004-06-17 2006-01-05 Brother Ind Ltd Image forming apparatus
JP2009113949A (en) * 2007-11-07 2009-05-28 Fuji Xerox Co Ltd Discharge device and image forming device
JP2010006606A (en) * 2008-05-29 2010-01-14 Canon Inc Sheet stacking device and image forming device
KR101447983B1 (en) 2010-03-19 2014-10-13 후지제롯쿠스 가부시끼가이샤 Image formation apparatus

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006003649A (en) * 2004-06-17 2006-01-05 Brother Ind Ltd Image forming apparatus
US7912418B2 (en) 2004-06-17 2011-03-22 Brother Kogyo Kabushiki Kaisha Image-forming device
US8401459B2 (en) 2004-06-17 2013-03-19 Brother Kogyo Kabushiki Kaisha Image-forming device
JP2009113949A (en) * 2007-11-07 2009-05-28 Fuji Xerox Co Ltd Discharge device and image forming device
US8235383B2 (en) 2007-11-07 2012-08-07 Fuji Xerox Co., Ltd. Discharge device and image forming apparatus
JP2010006606A (en) * 2008-05-29 2010-01-14 Canon Inc Sheet stacking device and image forming device
KR101447983B1 (en) 2010-03-19 2014-10-13 후지제롯쿠스 가부시끼가이샤 Image formation apparatus

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