JP3229071B2 - Sheet ejection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for placing a sheet on a sheet.
The present invention relates to a sheet discharging device for discharging a sheet onto a surface .

[0002]

2. Description of the Related Art For example, in a laser printer, when sheets after recording are stacked face-down, the sheets are stacked in the order of pages. Therefore, there is an advantage that it is not necessary to change the page order after picking up the sheet from the sheet mounting surface. On the other hand, since the recording surface faces downward, it is difficult to check the recording status on the sheet until the user picks it up from the sheet placement surface. -There is a disadvantage that it takes time to find out poor image quality such as insufficient density and background contamination.

[0006] Conventionally, as shown in FIG. 6, when the recorded sheet S is discharged from the paper discharge port 1a of the apparatus main body 1, both sides of the width of the recorded sheet S are left and right as shown in FIG. The guide member 3 is inserted into the guide member 3 and abutted against the front end 3a thereof, and the guide member 3 is rotated counterclockwise around the shaft 4 by the strength of the stiffness of the sheet S to the viewing position shown in FIG.
In some cases, the recording surface is visible from the front as shown by an arrow a.

In such a conventional image recording apparatus, both sides of the width of the recorded sheet S need to be taken out of the left and right guide members 3 and visually ejected onto the sheet placing surface 2 after the visual recognition.

For this reason, in the conventional image recording apparatus described above, cams 6 and 7 are provided between the guide member 3 and the bearing 5 as shown in FIG. Is pressed against the cam 7.
Then, when the guide member 3 is turned to the visual recognition position,
By the action of the cams 6 and 7, the guide member 3 is moved from the two-dot chain line position in FIG. 9 to the solid line position, and the distance between the guide members 3 is enlarged from l in FIG. 8 to L in FIG. Both sides are taken out of the guide member 3, fall on the sheet placing surface 2, and are stacked face down.

[0005]

However, in the conventional image recording apparatus, since the cams 6 and 7 are provided between the guide member 3 and the bearing 5 and are pressed by the coil spring 8, the structure becomes complicated. There was a problem that the number of parts increased and the cost increased.

Therefore, the present invention according to claim 1, when discharging a recorded sheet in a face-down state onto a sheet mounting surface , can easily record the state of recording on the sheet from the outside .
Visible over as large an area as possible
With the possible time visible as soon as possible after the door emissions, easy
The purpose is to release the hook at the front end of the seat with a simple structure.
Target.

It is a further object of the present invention to provide a simple structure for performing a return operation for the next sheet after releasing the sheet.

[0008]

According to a first aspect of the present invention, there is provided a sheet discharging apparatus for discharging a recorded sheet in a face-down state on a sheet mounting surface on which a sheet is mounted.
Means and the leading edge of the sheet discharged by the sheet discharging means
Only as the sheet is ejected,
And swing up the front edge of the seat
It has a hook member, and the hook member has turned by a certain angle.
When the angle of engagement with the leading edge of the sheet changes, the
Release the stop state and drop the sheet on the sheet placing surface.
And a sheet leading end guide means .

The invention according to claim 2 is the invention according to claim 1.
In the invention, the hook member is hooked on the leading end of a sheet.
When the stop state is released, the state returns to the original state by gravity .

[0010]

According to the present invention, the sheet leading end guide means B is provided with
The leading end of the sheet S discharged from the sheet discharging means A
The sheet S faces down while the locking member 13 is engaged.
In the discharge direction. Then, the sheet S is discharged
The hook member 13 is rotated by the waist of the sheet S
Then, when the leading end of the sheet S is turned up, the recording surface of the discharged sheet S can be visually recognized from the outside . In this way,
When the seat S rotates by a certain angle or more, the tip of the hook member 13 is
The angle between the end and the tip of the sheet S hooked on it,
The hooking angle changes, and the hooking state of the leading end of the sheet S is released.
Thus, to release the locking state of the seat S, Ru are stacked in a face-down state that sheet S on the sheet placing surface 12 is dropped.

According to the second aspect, the hooking portion 13b
When the hooked state of the sheet S and the leading end of the sheet S is released, the hook member 1 is released.
The tip of 3 falls on the sheet mounting surface 12 by gravity.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1, according to one embodiment of the present invention
1 shows an overall schematic configuration of a laser printer including a sheet discharging device .

Reference numeral 10 in the figure denotes an image recording apparatus main body, in which the right side in the figure is a front face 10a and the left side is a back face 10b.
And In this embodiment, the upper surface 1
0c, a sheet mounting surface 12 is provided, and
A sheet discharging means A for discharging the recorded sheet S toward the front face 10a is provided near the 0b side as described later. That sea
Above a sheet discharge port 11 of the sheet discharge means A, which will be described later.
A sheet tip guide means B is provided.

The sheet discharging means A is for discharging the sheet S to the sheet stacking surface 12, and has a sheet discharging port 1
1 and a paper discharge roller 24 provided facing the sheet discharge port 11.

The sheet leading end means B is provided for discharging the sheet.
While holding the leading end of the sheet S discharged from the discharging means A
Hook member for opening the sheet S by guiding it in the discharge direction
13. As shown in FIG. 2, the hook member 13 has a slightly elongated lever shape, and has a mounting shaft 13a protruding from both sides of a base end, and a sheet discharging means at a front end (free end).
13b for hooking the leading end of the sheet discharged from the printer
Is provided. The engaging portion 13b has a slightly wide plate-like shape, and is formed to have a substantially L-shaped cross section by bending its tip to one side at least 90 degrees. Then, the hook member 13 is connected to the sheet discharging section shown in FIG.
A mounting shaft 13a is rotatably mounted on the mounting portion 14 above the outlet 11 with the locking portion 13b facing downward, and the locking portion 13b is provided on the sheet mounting surface 12 by gravity.

On the other hand, in the main body 10 of the image recording apparatus, a photoreceptor 17 is disposed substantially at the center, a transfer unit 18 is disposed below the photoreceptor 17, and a fixing unit 19 is disposed on the left side thereof in the drawing. Then, the front 10a of the image recording apparatus main body 10
, A paper cassette 20 is detachably attached.

However, when recording on the sheet S,
As shown in FIG. 1, the sheet S in the sheet feeding cassette 20 is sent out by the rotation of the sheet feeding roller 21 and abutted between the pair of registration rollers 22.
The sheet S is conveyed to the lower side of the photoreceptor 17 while keeping the timing. Then, an image formed on the surface of the photoconductor 17 is transferred to the upper surface of the sheet S by a transfer unit 18 by a charger, an optical writing unit, a developing unit, or the like (not shown). After the transfer, the sheet S is guided by a conveyance guide (not shown) and is fixed by the fixing device 19.
To the heating roller 19a and the pressure roller 19
b, the transfer image on the sheet S is fixed.

Then, the sheet S leaving the fixing unit 19 is
The sheet is discharged by the discharge roller 24 after passing between the transport guides 23.
Discharge from mouth 11. Then, abut the sheet <br/> over preparative tip discharged from here to the hook member 13, with the output sheet S is further discharged, the hook member 13 is rotated at the waist of the sheet S, the The sheet S is guided in the discharge direction along the inner wall surface of the hook member 13 . And that shi
The tip of the sheet is discharged while sliding, and is caught by the hook 13b.
That either. When then further sheet S is discharged, as shown in FIG. 3, the leading end of the sheet S toward the discharge direction, knob
Ri is that on turning toward the front side. And the discharge sheet S
Is visible from outside as indicated by the arrow.

However, as the discharged sheet S is further discharged, the leading end of the sheet S and the hook member 13 are hooked.
The angle formed with the stop portion 13b, that is, the hook angle increases.
And the hook portion is rotated by the discharging force of the sheet S.
The leading end of the sheet S comes off from the hook 13b of the material 13 . this
As a result , the holding state of the hook 13b is released.
The sheet S falls, and as shown in FIG.
Stack up face down. At this time, the hook 13b falls on the stacked sheets S at the same time and the sheet S is pressed from above by the hooks 13b.

In the illustrated embodiment, the hook member 13 is formed of an elongated plate. However, as shown in FIG. 5, for example, the hook member 13 may be formed by bending a thin rod-shaped member.

[0021]

Effect of the Invention] Thus, according to the sheet discharging device of the present invention, on the sheet placing surface for placing the sheet, the sheet discharging hand for discharging the printed sheet in a face-down state
Step and the leading end of the sheet discharged by the sheet discharging means.
Only as the sheet is ejected, the sheet
Pivot around the waist and flip up the sheet
A hook member, and the hook member is rotated by a certain angle.
The angle of engagement with the leading edge of the seat changes and the leading edge of the seat
Remove the state and drop the sheet on the sheet mounting surface
A sheet leading edge guide means.
As the sheet with the leading end hooked to the
Latch on the sheet tip after the sheet tip is turned up
Guide the sheet at the waist of the sheet to release
The means is adapted to rotate.

That is, according to the present invention, the sheet discharging means
After the sheet is ejected, the sheet is guided until it is released.
The hook member of the sheet tip guide means
With the sheet edge turned up
Sheet that is ejected face down
All contents are visible from outside except for the sheet edge.
The guide members hold the left and right sides in the sheet width direction.
Because the part is not visible
The invisible area is greatly reduced. This allows the seat
It is said that it is much easier to check the description and it is convenient
In addition, after the sheet is discharged, it will be visible earlier in time.
To quickly determine whether the description on the sheet is defective.
To be able to make quick and good decisions
It is convenient.

Further, according to the present invention, when the angle formed between the sheet front end and the hook member, that is, the hooking angle is turned over a predetermined angle, the front end of the sheet naturally separates from the hook member. The guide member, which holds the left and right sides in the width direction of the sheet, moves to the left and right sides to release the sheet when it rotates more than a certain angle. Since the structure is simpler than that of a simple mechanism, the number of parts can be reduced and cost can be reduced.

Furthermore , according to the present invention, for example,
The sheet to be curled is
However, the leading edge of the sheet should be
Rotate the hook member at the waist of the seat while hanging on the hook member
The music of the sheet is
Discharge in the state of being bent in the opposite direction to the habit
The sheet curled downwards
The sheet is placed on the sheet loading surface with its curl corrected.
Highly reliable sheet discharge that can be tacked
The device can be provided.

Further, according to the second aspect,
When the hook at the leading end of the sheet is released
It gives a turning habit to return to its original state by the gas gravity
When the tip of the sheet comes off from the hook of the hook member,
Since the engagement portion drops into the sheet stacking surface by gravity, after a stack of sheets, the stacked sheets can be pressed from above by the hook member, for example, under the influence of wind of the installed air conditioner near or the like can be prevented that the stack sheet is disturbed.

[Brief description of the drawings]

FIG. 1 shows a sheet discharge device according to an embodiment of the present invention.
FIG. 2 is an overall schematic configuration diagram of the obtained laser printer.

FIG. 2 is a perspective view of a hook member provided in the laser printer.

FIG. 3 is a state diagram of the laser printer showing a state where the hook member is rotated by a discharge sheet and a recording surface of the sheet is checked from the outside.

FIG. 4 is a state diagram of the laser printer showing a state in which the stack of discharged sheets is pressed by a hook member after the stacked discharged sheets.

FIG. 5 is a perspective view showing another example of a hook member provided in the laser printer.

FIG. 6 is a schematic configuration diagram of a conventional laser printer.

FIG. 7 is a state diagram of the laser printer showing a state in which a guide member provided in the laser printer is rotated by a discharge sheet and a recording surface of the sheet is checked from the outside.

FIG. 8 is an enlarged sectional view of a joint between the guide member and the bearing in the state of FIG. 6;

FIG. 9 is an enlarged cross-sectional view of a joint between the guide member and the bearing in the state of FIG. 7;

[Explanation of symbols]

 10Image recordingDevice body 10aImage recordingFront of device main unit 10bImage recordingRear surface of apparatus main body 12 Sheet mounting surface 13 Hook member 13b HookA Sheet discharging means B Sheet tip guide means  S sheet

Claims (2)

(57) [Claims] 1. A sheet discharging apparatus for discharging a recorded sheet in a face-down state on a sheet mounting surface on which a sheet is mounted.
And only the leading edge of the sheet discharged by the sheet discharging means.
Stop, and as the sheet is discharged,
Hook that pivots and flips up the sheet tip
When the hook member rotates by a certain angle,
The angle of engagement with the leading edge of the seat changes,
Remove and drop the sheet onto the sheet mounting surface
A sheet discharging device comprising a tip guide means . 2. The front end of a sheet is hooked on the hook member.
3. The seat according to claim 2, wherein a rotation habit of returning to an original state by gravity when the state is released is provided .
Discharge device.