JP2949534B2 - 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 feeder incorporated in a printer, a scanner or the like.

[0002]

2. Description of the Related Art FIG. 4 is a schematic diagram for explaining the structure of an OCR scanner. In FIG. The sheet (original) conveyed by the sheet feeding device 10 is sent to the reading unit 111. In the reading unit 111, reading is performed by irradiation of the fluorescent lamp 112, and the sheet that has been read is conveyed to a conveying system including a plurality of feed rollers and is stacked.
It is discharged to 3.

FIG. 2 is a schematic explanatory view of the structure of a conventional sheet feeding device 10 (FIG. 2A is a front view, FIG. 2B is a plan view, FIG.
(C) is a side view), in which 1 is a hopper table on which sheets and forms are mounted, 2 is a pick roller, and 3 is a separation mechanism. Note that, in this drawing, papers and forms mounted on the hopper table 1 are omitted.

[0004] The separating mechanism 3 is provided as shown in FIG.
To a drive pulley 4, a driven pulley 6, the conveying belt 7 stretched over these pulleys is constituted by a separation roller 8 pressed against the conveyor belt 7 a built-in torque limiter. The pick roller 2 and the pulley 4 are driven by a common drive source (not shown) and rotate in the direction of the arrow.
As a result, the paper 1 is fed out by the pick roller 2,
The sheet is conveyed between the conveyance belt 7 and the separation roller 8 .

[0005] The separation roller 8 rotates (belt 7) when only one sheet or form is fed out by the pick roller 2.
When the number of sheets is two or more, the operation is stopped by the action of the torque limiter to prevent double feed.

[0006]

In this paper feeder, the following various problems have arisen in response to the demand for improving the transport accuracy of papers and forms. In other words, the pick roller and the paper,
There is a problem in that the paper and the papers proceed obliquely while being conveyed (skewed) due to causes such as a bias in contact with the papers and a deviation in the diameter of the pick roller. FIG. 3 illustrates a case where the contact state between the left and right pick rollers 2 and 2 is not uniform due to the warpage of the hopper table 1 (the contact pressure differs between the left and right).

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sheet feeding device capable of solving skew of sheets and documents fed by a pick roller.

[0008]

According to the present invention, a hopper table 11 on which a recording medium is placed and a hopper table 1
1 Rotate by contacting the recording medium such as paper, form, etc., and record
A paper feeder having at least a plurality of pick rollers for feeding out a medium , wherein the hopper table 11 is made of an elastic material.
This hopper table 1 can be formed and bent.
1st and 2nd adjustment members 14 and 15 fixed to the back of
Tighten the hopper table 11 several picks
Hopper table so that it abuts the rollers evenly
End portion 1 including a contact portion of the nozzle 11 with the pick roller
There is provided a tilt adjusting means for adjusting the tilt of 1a.

Further, the inclination adjusting means of the sheet feeding device is provided with
It is fixed to one end 11a side of the back surface of the upper table 11.
Rigid first adjusting member 14 and first adjusting member 1
4 and fixed to the back of the hopper table 11 at an interval.
Second adjusting member 15 and first and second screws 16,
17 and the first adjusting member 14 is a second adjusting member.
A first screw 1 formed on one side opposite to the first screw 15
6 and a second adjusting member 15
The second screw 17 formed on the other side opposite to
And a second adjusting member 15 having a first hole 21
Is opposed to the first screw hole 22 of the first adjusting member 14.
Second hole 2 formed in position and through which the first screw 16 passes
5 and a position facing the first hole 21 of the first adjustment member 14.
Second screw hole 2 formed in
6).

[0010]

The inclination of the pick roller contact portion of the hopper table can be adjusted by the inclination adjusting means. Therefore, even if the contact between the pick roller and the recording medium on the hopper table is biased due to the accuracy of the parts, the bias can be eliminated by adjusting the inclination of one end of the hopper table. This bias adjustment is performed in the following procedure by the tilt adjusting means of the second configuration.

The tilt adjustment is performed by rotating the first screw or the second screw. For example, when the first and second screws are right-handed screws, when the first screw is rotated clockwise, the gap between the first adjusting member and the second adjusting member in the vicinity thereof is reduced, and the hopper table is rotated. Has one end inclined in one direction. When the second screw, which is displaced in the first direction from the first screw, is rotated clockwise, the gap between the first adjusting member and the second adjusting member in the vicinity thereof is reduced,
One end of the hopper table tilts in the opposite direction as described above.

As described above, since the inclination of one end of the hopper table can be adjusted by the inclination adjusting means to eliminate the bias of contact between the pick roller and the recording medium, the problem of skew of the recording medium can be solved. Become.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is an explanatory view of a main part structure of a sheet feeding device of the present embodiment (FIG. 1A is a bottom view, and FIG.
1A is a cross-sectional view, and FIG. 1C is a cross-sectional view of FIG.
In the drawing, 11 is a hopper table, and 12 is a tilt adjusting means. The paper feeder is provided with a pick roller and a separation mechanism similar to those of the related art, in addition to these members.

The hopper table 11 is formed of an elastic material such as plastic, and further has a notch 13a formed in a part of its peripheral wall 13 to intentionally lower the bending rigidity so as to locally deform. Let me do it. A pick roller (not shown) is configured to face and contact one end 11a on the left side of the notch 13a.

The inclination adjusting means 12 is a rigid (metal) first member.
Adjustment member 14 and rigid (metal) second adjustment member 15
And a first screw (right-hand screw) 16 and a second screw (right-hand screw) 17.

The first adjusting member 14 is fixed to the left side of one end 11a of the hopper table 11 on the left side of the notch 13a by a flathead screw 18. The first adjusting member 14 is integrally formed with two flanges 19 and 20 parallel to the surface of the hopper table 11. The flange 19 is provided with a hole 21 into which the second screw 17 is fitted, and the flange 20 is provided with a screw hole 22 into which the first screw 16 is screwed.

The second adjusting member 15 is fixed to the right rear side of the notch 13a of the hopper table 11 by a countersunk screw 23. The second adjustment member 15 is integrally formed with a flange 24 parallel to the surface of the hopper table 11. Flange 24 is flange 19, 20
And the flange 24 has a screw hole 22
And a screw hole 2 in which the first screw 16 fits and which faces upward of the screw hole 2 and in which the second screw 17 faces and fits below the hole 21.
6 are provided.

The first screw 16 is inserted through the hole 25 into the screw hole 2.
2 and the second screw 17 passes through the hole 21 and
Screwed to 6. The second screw 17 is shifted in the first direction (rightward) with respect to the first screw 16.

One end 11a which is a pick roller contact portion
Can be precisely adjusted by tightening the first and second screws 16 and 17. That is, the first
When the screw 16 is rotated clockwise and tightened, the flange 20 moves to the flange 24 side, and one end 11a is
The portion is inclined in the direction of arrow C in FIG. When the second screw 17 is rotated clockwise and tightened, the flange 19 moves toward the flange 24, and the one end 11a is inclined in the direction of arrow C 'in FIG. 1B. Thereby, the bias of the contact of the pick roller with the hopper table 11 can be eliminated. The one end 11a is inclined by the screw tightening as described above because the hopper table 11 is formed of an elastic body, and by forming the notch 13a in the peripheral wall 13 as in the present example, the one end 11a is inclined. The inclination of the portion 11a is more easily performed.

In the above description, the inclination adjustment at one end of the hopper table has been described. However, when there is a pick roller at the other end, similar inclination adjusting means is provided at this end. Just do it.

[0022]

As described above, the present invention provides a plastic
Hopper that can be bent by being formed of an elastic body such as a hook
-On the back surface of the table 11, the first and second adjustment members 14,
15 between the first and second adjusting members 14 and 15.
Hopper that contacts the pick roller in response to the tightening of
-Adjust the inclination of at least one end 11a of the table 11
For use on the hopper table 11
Evenly contact the pick roller with the recording medium such as paper, form, etc.
Can be fine-tuned to prevent skew
Thus, there is an advantage that the paper can be fed smoothly.

[Brief description of the drawings]

FIGS. 1A and 1B are explanatory views of a main part structure of a sheet feeding device according to an embodiment of the present invention, wherein FIG. 1A is a bottom view, and FIG.
FIG. 1C is a cross-sectional view taken along arrow A, and FIG. 1C is a cross-sectional view taken along arrow B of FIG.

FIG. 2 is a schematic diagram illustrating the structure of a conventional sheet feeding device.
2A is a front view, FIG. 2B is a plan view, and FIG. 2C is a side view.

FIG. 3 is a diagram illustrating a problem of a conventional sheet feeding device.

FIG. 4 is a schematic diagram illustrating the structure of an OCR scanner device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Hopper table 11a One end part 12 Inclination adjustment means 14 1st adjustment member 15 2nd adjustment member 16 1st screw 17 2nd screw 19,20,24 Flange 21,25 hole 22,26 Screw hole

──────────────────────────────────────────────────続 き Continued from the front page (56) References JP-A-2-117523 (JP, A) JP-A-1-149332 (JP, U) JP-A-57-99844 (JP, U) JP-A-4 33161 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B65H 1/00-3/68

Claims (2)

(57) [Claims] A hopper table (1) on which a recording medium is placed;
1), said hopper - rotates in contact with the recording medium on the table (11), at least provided with the sheet feeding apparatus and a plurality of pick roller for feeding the recording medium, the hopper table (11) and forming an elastic body, the fixed to the rear surface of the hopper table (11)
By tightening between the first and second adjustment members (14, 15),
The hopper table (11) is moved to the plurality of pick rows.
The hopper table so that the hopper table
(11) Including the contact portion with the pick roller
A sheet feeding device provided with a tilt adjusting means for adjusting a tilt of an end (11a) . Wherein said inclination adjusting means, the back surface of the one end of the hopper table (11) and the first adjustment member rigid fixed to (11a) side (14), the first adjustment member (14) And the hopper at an interval
A second adjusting member (15) fixed to the back surface of the table (11); and first and second screws (16, 17), wherein the first adjusting member (14) includes the second adjusting member (14). Adjustment member
(15) The first member formed on one side opposite to the first member.
A first screw hole (22) for screwing the screw (16) of
On the other side opposite to the second adjustment member (15),
A first hole through which the formed second screw (17) passes
(21), wherein the second adjusting member (15) includes the first adjusting member.
(14) at a position facing the first screw hole (22).
A second hole through which the formed first screw (16) passes
(25) and the first adjusting member (14).
The second screw formed at a position facing the hole (21);
This and a second threaded hole to be screwed (26) to (17)
The sheet feeding device according to claim 1, wherein: "