JP3534150B2 - Paper feeder - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeding device applied to a device such as a printer.

[0002]

2. Description of the Related Art Positioning a stack of recording sheets below a recording / writing section has been widely adopted as a means for reducing the space occupied by the apparatus. Since there is a step at the junction of the paper guides and the confluence of the paper transport path because the path must be formed in a U shape, when thick recording paper passes through these parts, The strong stiffness of the paper causes a repellant sound, or the strong stiffness causes a forward pushing force that adversely affects printing.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides a new paper feeding device having such a U-shaped feeding path, which can eliminate the above-mentioned inconvenience caused at the inverted portion thereof. To do.

[0004]

That is, according to the present invention, in order to achieve the above-mentioned object, it is provided below the recording / writing section.
One of disposed the stack of the paper, printing writing through the respective U-shaped sheet transport path a sheet from the both the stack unit
In the paper feeding apparatus that supplies the parts, door in a closed state constitutes one of the outside of the U-shaped sheet guide path, and in the open state you opening the outer U-shaped paper guide path <br /> members, while attached openably to the case body, the confluence of the two U-shaped sheet guide path, on which is located an inner surface on the inside
The U-shaped paper guide path constitutes a part of the U-shaped paper guide path whose outer surface is located outside and is supported by a hinge portion.
It is by the guide member rotatable substantially triangular, the inner U
It was attached so as to open the letter paper guide path .

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. The drawings show an embodiment of the present invention applied to an inkjet printer.

Below the ink jet type recording / writing unit indicated by reference numeral 1 in the drawing, sheet feeding units 2U, 2L for feeding recording sheets of different sizes or different types.
Are arranged in a stacked manner, and hoppers 3U and 3L for accommodating respective recording papers are detachably attached to these, and the recording is pulled out from the inside of the upper hopper 3U by the upper pickup roller 4U. As for the paper, it goes through the sub paper feed roller 5 and the lower pickup roller 4L.
The recording paper pulled out from the lower hopper 3L is fed via the U-shaped paper guide 7 toward the flat paper conveyance path 8 extending in the front and rear of the recording / writing unit 1.

Therefore, on the front side of the upper sheet feeding unit 2U, that is, on the right side in the drawing, the sub sheet feed roller 5 and the roller 6 rolling in contact with the sub sheet feed roller 5 are provided on the upper side of the flat sheet transport path 8 in the sheet transport direction. U-shaped paper guides 7 are formed in these nip portions A so as to meet each other, and further, at the confluence portion between the sub paper feed roller 5 and the U-shaped paper guide 7. , The guide surface 9 whose inner side is along the sub paper feed roller 5
A substantially triangular movable guide member 9 whose outer surface 9b is a part of the U-shaped paper guide 7 is rotatably attached so that it can be opened to the right in FIG. 1 with the hinge portion 9c as a fulcrum.

By the way, reference numeral 10 in the drawing denotes a case main body which covers the recording / writing unit 1 and the upper sheet feeding unit 2U.
On the front side of the case main body 1, a front door 12 that can be opened at a right angle to the right side of FIG. 1 with a hinge 11 provided at the lower end of the upper sheet feeding unit 20 as a fulcrum is provided so as to be openable and closable. Arc-shaped guide surface 1 provided on the inner surface of the front door 12
U-shaped paper guide 7 provided with 3 on the upper paper feeding unit 2U side
By arranging the lower half portion and the outer side surface 9b of the movable guide member 9, a lower paper guide path is configured.

In the front door 12, a manual feed guide surface 14 extending horizontally toward the nip portion A between the sub paper feed roller 5 and the roller 6 is provided at the upper end of the guide surface 13 along the outer surface 9b of the movable guide member 9. Is formed toward the outside, and further the front door 1
A hinge 15 is provided on the upper part of 2 at substantially the same position as the manual feed guide surface 14, and the hinge 15 includes
A manual feed guide plate 16 having an inner surface as a manual feed surface 17 is provided so as to be openable and closable so as to be horizontally opened to the front side.

A printer constructed in this way is usually
As shown in FIG. 1, the movable guide member 9 is erected and its inner guide surface 9a is put along the paper feed roller 5 to form an upper paper guide path, and the outer surface 9b of the U-shaped paper guide 7 is formed. By making it a part and further covering it with the front door 12, the inner guide surface 13 is arranged so as to be along the lower half of the U-shaped guide 7 and the outer surface 9b of the movable guide member 9. It is used to form a paper guide path.

Further, in this state, when it becomes necessary to manually feed a postcard or the like, as shown in FIG. 2, the manual feed guide plate 16 on the upper part of the front door 12 is opened to the right side in FIG. , Postcards, etc. on the inner manual feed surface 17 and the manual feed guide surface 1
The paper is fed by inserting it into the nip portion A between the sub paper feed roller 5 and the roller 6 while moving along the line 4.

On the other hand, when a paper jam occurs in the lower paper guide path, the front door 12 is opened to the right side in FIG.
As a result, the U-shaped paper guide 7 can be exposed to the outside, and the sub paper feed roller 5 can be exposed to the outside by tilting the movable guide member 9 to the right side in FIG. The resulting paper jam can be easily treated.

Although the present invention has been described with reference to the embodiment applied to a printer, the paper feeding device according to the present invention can be applied to other devices such as a copying machine and a facsimile. You can

[0014]

As described above, according to the present invention , by the door member and the movable guide member member, the popping noise that occurs immediately after the trailing edge of the paper leaves the guide surface is reduced. In addition, the forward pushing force generated by the strong stiffness of the paper can be reduced, and the adverse effect on the printing accuracy can be eliminated.

Moreover, by separating the paper guide path, it is possible to perform a sufficient guide function even for small size paper and weak paper.
By opening the door member and the movable guide member member, it is possible to remarkably improve the jam processing.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an apparatus showing an embodiment of the present invention in a normal use state.

FIG. 2 is a diagram showing a manual sheet feeding state of the above apparatus.

FIG. 3 is a diagram showing a jam processing state of the same apparatus.

[Explanation of symbols]

1 Recording / writing unit 2U, 3L paper feeding unit 5 Sub paper feed roller 6 U-shaped paper guide 9 Movable guide member 13 Guide surface 16 Manual feed board

Claims (2)

(57) [Claims] 1. A stack of two sheets is provided below the recording / writing unit, and the sheets are supplied from both stacks to the recording / writing unit via respective U-shaped paper transport paths. In the paper feeding device, a door member that constitutes one of the outer U-shaped paper guide paths in the closed state and opens the outer U-shaped paper guide path in the open state is attached to the case body so as to be openable and closable. on the other hand, the merging portion of both U-shaped paper guide path, the inner surface on the inside
The U-shaped paper guide path is located, the outer surface constitutes a part of the U-shaped paper guide path is located in the outer, and the hinge portion
A paper feeding device, wherein a substantially triangular guide member supported and rotatable is attached so as to be openable so as to open the U-shaped paper guide path inside. 2. The paper feeding device according to claim 1, wherein a guide member for inserting a manual paper for inserting a paper toward the merging portion is attached to the door member so as to be openable and closable.