JP2752956B2 - Printer 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 printer paper feeder for feeding sheets one by one to a printing section of a printer.

[0002]

2. Description of the Related Art As shown in FIG.
0 is provided, the paper 20 is stacked on the paper tray 10, and the spring 2 pushes up the paper tray 10 and the uppermost paper 2
Reference numeral 0-a is in contact with the paper feed roller 4 supported on the shaft 3. The uppermost sheet 20-a is fed in the direction of arrow 40 by the rotation of the sheet feeding roller 4. At this time, a sheet separation unit 15 is provided in front of the sheet storage unit 1 in order to prevent sheets other than the sheet 20-a from being fed while being overlapped. The paper separating unit 15 includes the guide 12 and the friction plate 1 that is fixed by being inclined along the ridge of the guide 12 on the side of the paper storage unit 1.
And 1.

In this printer paper feeding device, there is a limit in the thickness and rigidity of the paper in which the paper separating portion works effectively. Depending on the difference in the thickness (rigidity) of the paper, a dedicated paper feeding device is used or the paper separating device is used. Parts had to be replaced.

[0004]

A problem with the prior art is that a thick paper or a thin paper loaded from a paper storage unit is separated one by one from a dedicated paper feeder or a paper feeder suitable for the paper feeder. That is, it is necessary to prepare a paper separating unit.

[0005] The reason is that if the paper separating section is inappropriate for the paper, thick paper or hard-to-bend (strong) paper such as a postcard or an envelope is liable to cause a paper feeding error. Because of the lack of paper stiffness, several sheets were fed together (double feed), making it difficult to separate them one by one.

The present invention makes it possible to separate various types of paper from thick paper to thin paper one by one with a single paper feeder and without replacing the paper separation unit, thereby improving performance and reliability. With the goal.

[0007]

According to the present invention, there is provided a printer sheet feeding device comprising: a sheet storage portion (1 in FIG. 1) for stacking and storing a plurality of sheets; A paper feed roller (4 in FIG. 1) for feeding the upper one,
A sheet separating unit (5 in FIG. 1) supported by a rotating shaft (8 in FIG. 1) parallel to the front side of the sheet, on the front side of the sheet storing unit;
A plurality of sets of slopes (5-a and 5-b in FIG. 1) parallel to the rotation axis and plastic sheets (6 and 7 in FIG. 1) provided on the outer periphery of the sheet separating section, When a set of the inclined surface and the plastic sheet are positioned such that the leading end of the sheet fed from the sheet storage unit by the sheet feeding roller collides with the sheet, the set is rotated about the rotation axis. The slope of the sheet is inclined from the plane perpendicular to the sheet feeding direction so that the upper end is displaced in the sheet feeding direction, the lower side of the set of plastic sheets is fixed to the lower side of the slope of the sheet separating section, and the upper side is free. It is characterized by being an end.

[0008] By rotating the sheet separating section according to the thickness of the sheet (strength) to switch between the slope and the plastic, various sheets can be separated one by one with a single sheet feeding device. .

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a side view showing the configuration of a printer paper feeder according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a sheet storage unit, on which sheets are stacked on the upper surface of a sheet tray 10. 4 is a paper feed roller
By rotating, the paper is transported forward (in the direction of the arrow). Reference numeral 5 denotes a sheet separation unit, and a sheet 20 is provided in front of the sheet storage unit 1.
The main part is a square rod having a substantially square cross-section, which is rotatably mounted on a rotation shaft 8 provided in parallel with one side, and is parallel to the chamfered rotation shaft 8 along opposing edges. Various slopes 5-a and 5-b are provided, and plastic sheets 6 and 7 having different rigidities are attached to each of the slopes 5-a and 5-b. Further, by operating the switching means 9, the sheet separating unit 5 is moved 180 degrees around the rotation shaft 8.
Can be rotated degrees.

FIG. 2 is a view showing a state rotated by 180 degrees with respect to FIG. In FIG. 1, the slope 5-a is positioned such that the leading end of the sheet 20-a fed from the sheet storage unit 1 collides, and in FIG. -A is located such that the tip of the object collides. Slope 5
In the state where −a is located as shown in FIG. 1, the lower side of the plastic sheet 6 is fixed to the lower surface of the inclined surface 5-a of the sheet separating section 5, and the upper side of the plastic sheet 6 is a free end. . Similarly, the plastic sheet 7 is attached to the plastic sheet 6 in point symmetry about the rotation axis 8.

In FIG. 1, a paper feed roller 4 is a top paper 20- of a stacked paper (from thin paper to plain paper) 20.
a, and transports the sheet 20-a forward (in the direction of arrow 40). The sheet 20-a moves, and the angle of the separation means 5 at the front is sharp , that is, with respect to the transport direction of the sheet 20-a.
The plastic sheet 6 having low rigidity on the inclined surface 5-a at an inclined angle close to a right angle direction is pressed. The plastic sheet 6 comes into contact with the steep slope 5-a and stops. The papers 20 other than the topmost paper 20-a are pushed forward only by the frictional force between the papers, but come into contact with the plastic sheet 6 and stop. Further, the paper feed roller 4 rotates, and the uppermost paper 20
-A, the conveying force exceeds the reaction force of the plastic sheet 6 having low rigidity, and the paper 20-a is moved by one.
Only the sheets are transported separately.

When the sheet is thick, the sheet separating section 5 is rotated 180 degrees by the switching means 9 in advance from the state of FIG. 1 as shown in FIG. The operation is basically the same as that of the thin paper shown in FIG. 1, except that the rigidity of the plastic sheet 7 and the angle of the plastic sheet 7 are gentle, that is, how the paper 20-a is conveyed.
By using the inclined surface 5-b having an angle close to the direction parallel to the direction, the reaction force of the plastic sheet 7 is increased, and only one of the uppermost sheets 20-a can be separated and conveyed.

It is to be noted that not only the slope and the plastic sheet are provided at only two places in the paper separating portion, but also provided at each ridge at four places so that the slope angle and the plastic sheet rigidity at each place are different. You may. Further, the cross section of the sheet separating section may be a polygon such as an equilateral triangle or a regular pentagon, and a plurality of sets of slopes and plastic sheets may be provided in the sheet separating section.

[0016]

As described above in detail, according to the printer sheet feeding apparatus of the present invention, the sheet separating section is rotated to change the sheet into an optimum slope and a plastic sheet according to the thickness of the sheet. In addition, the paper can be separated and fed regardless of the thickness and the material of the paper. This makes it possible to separate various types of paper from thin paper to postcards and thick paper such as envelopes without using a single paper feeder and without replacing and replacing the paper separation unit.

[Brief description of the drawings]

FIG. 1 is a side view illustrating a configuration of a printer sheet feeding device according to an embodiment of the present invention.

FIG. 2 is a side view of the printer sheet feeding device of FIG. 1 in a state where a sheet separating unit 5 is rotated by 180 degrees in order to feed a thick sheet.

FIG. 3 is a side view of a conventional printer paper feeding device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paper storage part 4 Paper feed roller 5 Paper separation part 6 Plastic sheet 7 Plastic sheet 9 Switching means 10 Paper tray 11 Friction plate 12 Guide 13-15 Paper separation part 20 Paper

Claims (4)

(57) [Claims] A sheet storage unit for stacking and storing a plurality of sheets, a sheet feeding roller for feeding an uppermost sheet stacked in the sheet storage unit, and a sheet in front of the sheet storage unit. A sheet separating portion pivotally supported by a rotation axis parallel to the front side of the sheet, and a plurality of sets of inclined surfaces and plastic sheets parallel to the rotation axis provided on the outer periphery of the sheet separation portion, When the sheet separating unit is rotated about the rotation axis and the pair of the slope and the plastic is positioned so that the leading edge of the sheet sent from the sheet storage unit by the sheet feeding roller collides, The set of slopes is inclined from a plane perpendicular to the sheet feeding direction such that the upper end is displaced in the sheet sending direction, and the lower side of the set of plastic sheets is fixed to the lower side of the slope of the sheet separating section and the upper side is Free end Printer feed apparatus according to claim Rukoto. 2. A plurality of sheets provided on an outer periphery of the sheet separating section.
Sets of ramps and plastic sheets parallel to the axis of rotation
Plastic sheets have different rigidities depending on the group.
The printer paper feeding device according to claim 1, wherein 3. The apparatus according to claim 1, wherein said sheet separating section is provided on an outer periphery of said sheet separating section.
A set of slopes and plastic sheets parallel to the axis of rotation
Sent from the paper storage unit by the paper feed roller
The slope when the leading edge of the paper is positioned to collide
The angle of the paper to the direction in which the paper is sent out
3. The method according to claim 1, wherein
Printer paper feeder. 4. A main part of the paper separating section has a substantially square cross section.
Use a square bar on each of the opposing edges of this square bar
The sheet according to claim 1, 2 or 3, wherein a set of worksheets is provided.
Printer paper feeder.