JP3439136B2 - 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.

[0002]

2. Description of the Related Art Conventionally, an apparatus of this type is disclosed in, for example, Japanese Patent Laid-Open No.
No. 267,944. According to this publication, a base having an inclined portion, an inclined surface, a stopper, and a paper support portion, an elevator, and a paper feed roller are shown. Then, at the time of paper feeding, the inclined surface (movable portion) moves, and the paper is fed past the stopper.

[0003]

The above-mentioned apparatus has the first drawback that the paper skews due to the variation in the contact condition between the paper and the feed roller. When the cause of the present invention was investigated, it was found that the inclined surface was entirely formed along the leading end surface of the paper, so that the frictional force between the paper and the inclined surface was large.

Further, in the above-mentioned apparatus, since the inclined surface and the stopper (both movable parts) are provided so as to follow the front end surface of the paper as a whole, there is a second drawback that the structure becomes complicated and the cost becomes high. Therefore, in consideration of the above-mentioned conventional drawbacks, the present invention provides a paper feeding device which prevents the skew of the paper at the time of paper feeding and has a simple structure.

[0005]

In order to solve the above-mentioned problems, the present invention according to claim 1 provides a base having an inclined portion, a triangular portion and a horizontal portion, and the inclined portion for moving up and down the paper. An elevator that is provided, a paper feed roller that feeds the paper, and a stopper that is provided on the triangular portion and has a rotatable protrusion, and the triangular portion is integrally formed on the base. Is.

According to the second aspect of the present invention, the front end surface of the paper abuts on the rising portion of the triangular portion before feeding, and at the time of feeding,
The leading end surface of the paper contacts the protrusion.

According to a third aspect of the present invention, a plurality of the triangular portions are provided at predetermined intervals so as to be aligned substantially parallel to the leading end surface of the paper.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A sheet feeding device 1 according to an embodiment of the present invention will be described below with reference to FIGS. 1, 2, 3, 4, and 6. FIG. 1 is a side sectional view of a printing device 2 using the paper feeding device 1. FIG. 2 is a front view of the paper feeding device 1.
FIG. 3 is a plan view of the paper feeding device 1. FIG. 4 is a perspective view of a triangular portion and a stopper used in the paper feeding device 1.
FIG. 6 is a perspective view of the stopper mainly.

In these figures, the base 3 has a slanted portion 4
And a horizontal part connected to it. Then, the triangular portions 8, 9, 10 are arranged so as to be aligned substantially parallel to the front end portion 7 of the paper 6.
Are formed with a predetermined interval (see FIG. 3). That is, the triangular portions 8, 9 and 10 are formed at a position slightly ahead of the horizontal portion 5 with respect to the joint between the inclined portion 4 and the horizontal portion 5 (FIG. 1). In this way, the triangular portions 8, 9, 10 are not provided separately from the base 3, but are formed integrally with the base 3.

The triangular portions 8, 9 and 10 are formed by connecting rib portions 11 to a triangular shape when viewed from the side. The tip of the rib portion 11 is connected to the horizontal portion 5. The triangular parts 8, 9 and 10 include a rising part 12, a top part 13 and a descending part 14.
Is formed, and a cavity 15 is formed near the center thereof (see FIG. 4).

As shown in FIGS. 1 and 4, the stopper 16 is
It comprises a protrusion 17, a bearing 18, and a hook 19. Axis 2
Reference numeral 0 passes through the bearing 18 and is supported by the triangular portion 9.
One end of the spring 21 is fixed to the hook portion 19 of the stopper 16, and the other end is fixed to the hook portion formed on the horizontal portion 5. The right side surface of the protrusion 17 is in contact with a protrusion (not shown) formed on the triangular portion 9. A clockwise torque is applied to the stopper 16 by the spring 21, the stopper 16 is brought into contact with the protruding portion, and the protruding portion 17 is always oriented substantially vertically. The protrusion 17 has a predetermined angle,
It is rotatably installed. In this way, the stopper 16
Has a protrusion 17 which is provided in each of the triangular portions 8, 9 and 10 and is rotatable.

The elevator 22 is formed in the shape of a plate having a bent edge, and a shaft 23 fixed to the inclined portion 4 serves to
The sides are pivotally supported. The spring 24 is arranged between the vicinity of the other end of the elevator 22 and the convex portion of the inclined portion 4.

Cam receivers 25, 26 projecting upward are formed at appropriate positions of the elevator 22 (see FIGS. 1 and 2). The paper 6 is placed on the elevator 22, and the paper 6 and the elevator 22 are configured to move up and down.

In the horizontal part 5 of the base 3, the triangular parts 8, 9,
A plurality of convex portions 27 each having a triangular side surface are formed at a position apart from 10 (see FIGS. 1 to 3). A plurality of convex portions 28 are formed in the horizontal portion 5 (see FIGS. 1 and 3).

A stop 29 is formed at the right end of the horizontal portion 5 (see FIGS. 2, 3, and 6). Stop 29
Is composed of an ascending portion 30, a descending portion 31, a bearing 32, a protrusion 33, a hook portion 34, and the like. The ascending part 30 and the descending part 31 are provided on the horizontal part 5, or the horizontal parts 5 and 1
It is physically formed. A shaft (not shown) fixed to the descending portion 31 is inserted into the bearing 32.

The hook portion 34 is fixed to one end of a spring (not shown), and the other end of the spring is fixed to a proper position of the base 3. In this way, the protrusion 33 is configured to be rotatable by the force of the spring. A paper support 36 is arranged above the base 3. The shaft portion 36 is supported by holes formed in the right side portion 37 and the left side portion 38 of the base, respectively. Shaft 36
Two paper feed rollers 39 and 40 are fixed in place (see FIG. 2). The paper feed rollers 39 and 40 are formed in a substantially D shape when viewed from the side. The cams 41 and 42 protruding outward so as to be located at the same positions as the cam receivers 25 and 26.
Are fixed to the shaft portion 36. In this way, the paper feed roller 3
Reference numerals 9 and 40 are for feeding the paper 6.

A gear (not shown) is fixed near the end of the shaft portion 36, the gear meshes with another gear, and the other gear is driven by a shaft drive motor (neither is shown). It is configured.

A shaft 43 is arranged substantially in the middle of the horizontal portion 5, the shaft 43 is inserted into a paper feeding roller 44, and the roller 45 is arranged above the paper feeding roller 44. A shaft 46 is arranged near the tip of the horizontal portion 5, and the shaft 46 is a discharge roller 47.
The roller 48 is disposed above the paper discharge roller 47. Further, a paper contact portion 49 is arranged at an appropriate position on the inclined portion 4, and the paper contact portion 49 is configured to be movable in the left-right direction (see FIG. 3). The paper feeding device 1 is configured by the above components.

The printing unit 50 includes, for example, a carriage 51,
The bearing 52, the shaft 53, the head 54 and the like are included. The carriage 51 is formed in a box shape, for example, and a bearing 52 is formed at an appropriate position.
The shaft 53 is arranged to be positioned in the scanning direction of printing, and the shaft 53 is inserted in the bearing 52.

The head 54 is, for example, an ink jet head, for example, 64 orifices are formed in the sub-scanning direction, and a piezoelectric element is arranged in the middle of each orifice. The 64 orifices are narrowed at their tips and connected to the ink tank via tubes (both not shown). By applying a predetermined voltage to each piezoelectric element, an ink droplet is ejected from a predetermined orifice. The paper feeding device 1 and the printing unit 50 constitute a printing device 2.

Next, the operation before sheet feeding will be described with reference to FIGS. First, the user appropriately moves the paper contact portion 49 according to the width of the paper 6 to place the paper 6 on the elevator 22. At this time, the cams 41, 42 fixed to the shaft portion 36
The tips of the cam receivers 25, 26 formed on the elevator 22.
Abutting against each other. Then, at the rotation angle of the shaft portion 36, the D-cut portion 55 formed on the paper feed rollers 39 and 40 is arranged at a position substantially parallel to the surface of the elevator 22.

As a result, the user can place a large amount of paper 6 in the gap between the D-cut portion 55 and the surface of the elevator 22. As described above, the leading end surface 7 of the paper 6 is in contact with the rising portions 12 of the triangles 8, 9 and 10 and is stationary before the paper feeding.

Next, when the user presses a print start switch (not shown), the shaft portion 36 starts to rotate clockwise, and the contact state between the cam 41 and the cam receiver 45 is released (see FIG. 5). ). As a result, the pushing force of the spring 24 causes the elevator 22 to move.
And the paper 6 is pinched between the paper feed rollers 39 and 40 and the surface of the elevator 22.

By setting the friction coefficient between the paper 6 and the paper 6a and the friction coefficient between the paper 6 and the paper feed rollers 39 and 40, the paper feed rollers 39 and 40 rotate to the highest position. Only the paper 6 of No. 6 starts to be fed. After that, the paper 6 advances, and the front end surface 7 of the paper 6 contacts the protrusion 17 of the stopper 16. At this time, the triangular parts 8, 9 and 10 are the front surface 7 of the paper 6.
A plurality of them are formed at a predetermined interval so as to be substantially parallel to. As a result, the descending parts 14 of the triangular parts 8, 9, 10
The area of contact between the paper 6 and the paper 6 is extremely smaller than that of the conventional product. Therefore, the resistance (friction force) that the paper 6 receives from each descending portion 6 becomes small, and the paper 6 is fed straight (without skew).

Further, the front end surface 7 of the paper 6 is provided with a stopper 16
By abutting each of the protrusions (3 pieces in total), the position of the front end surface 7 of the paper 6 is aligned at right angles to the paper feeding direction, and the paper 6 is prevented from skewing.

Further, the paper feed rollers 39 and 40 rotate, and the paper 6 advances. At this time, the force by which the paper feed rollers 39 and 40 move the paper 6 forward is set to be larger than the force by which the protrusion 17 blocks the forward movement of the paper 6. As a result, the front end surface 7 of the paper 6 gets over the protrusion 17 and continues to move forward.

After that, the right corner portion 56 of the front end surface 7 of the paper 6 is
It contacts the protrusion 33 provided on the stopper 29 and turns downward. When the paper 6 further advances, the protrusion 33 turns a little counterclockwise, and the right corner 56 turns over and turns up. As a result, the front end surface 7 of the paper 6 has the protrusion 33
Get over.

In this way, the force by which the protrusion 17 prevents the advance of the paper 6, the force by which the right corner 56 of the paper 6 is reversed, the distance between the surface of the paper 6 and the top of the protrusion 33, etc. are set. By doing so, only one sheet of paper 6 can get over the protrusion 33. In this way, it is possible to prevent a plurality of sheets of paper 6 from being fed simultaneously (double feed).

Further, when the paper feed rollers 39, 40 rotate, the leading end surface 7 of the paper 6 has rib portions 11 of triangles 8, 9, 10.
(See Figure 7). Then, the paper feed rollers 39, 4
0 rotates, and the leading end surface 7 of the paper 6 is sandwiched between the paper feeding roller 44 and the roller 45. At this time, the cams 41 and 42 again come into contact with the cam receivers 25 and 26, and the elevator 22 descends,
In the vicinity of the rear end of the paper 6, the paper feed state by the paper feed rollers 39 and 40 is released.

Instead of this, the front end surface 7 of the paper 6 is fed by the paper feed roller 44, and a predetermined printing is performed by the printing unit 50. When the printing is completed, the paper 6 is ejected by the paper ejection roller 47.

[0031]

According to the first aspect of the present invention, the triangular portion is provided with the stopper having the rotatable protrusion, and the triangular portion is formed integrally with the base. In this way, as in the past,
Since the triangular portion is made stationary without being movable, and is integrally formed on the base without providing another object, the structure is simplified and the cost is reduced as compared with the conventional case.

According to the second aspect of the present invention, since the front end surface of the paper abuts the rising portion of the triangular portion before the paper is fed, a large amount of paper can be stored. Further, since the front end surface of the paper abuts on the protrusion during paper feeding, the front end surfaces can be aligned at right angles to the paper feeding direction, and skew of the paper can be prevented.

According to the third aspect of the present invention, a plurality of triangular portions are provided at predetermined intervals so as to be aligned substantially parallel to the front end surface of the paper. As a result, the area where the descending part of the triangular part and the paper contact each other is much smaller than that of the conventional product. Therefore, the resistance (friction force) that the paper receives from the descending portion becomes small, and the paper is fed straight (without skewing).

[Brief description of drawings]

FIG. 1 is a side sectional view of a printing device 2 using a paper feeding device 1 according to an embodiment of the present invention.

FIG. 2 is a front view of the paper feeding device 1.

FIG. 3 is a plan view of the paper feeding device 1.

FIG. 4 is a perspective view of a triangular portion and a stopper used in the paper feeding device 1.

FIG. 5: The printing device 2 when the paper contacts the stopper
FIG.

FIG. 6 is a perspective view of a stopper portion 29 used in the paper feeding device 1.

FIG. 7 is a side sectional view of the printing device 2 when the paper has passed the stopper.

[Explanation of symbols]

3 bases 4 slope 5 Horizontal part 6 paper 9 Triangle 16 stopper 17 Protrusion 22 Elevator 39 paper feed roller

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-9-12168 (JP, A) JP-A-9-267944 (JP, A) JP-A-7-267416 (JP, A) JP-A-8- 268590 (JP, A) JP 10-109772 (JP, A) JP 9-110222 (JP, A) JP 11-208916 (JP, A) Actual flat 2-145242 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B65H 1/02 B65H 1/04 326

Claims (3)

(57) [Claims] 1. A base having an inclined portion, a triangular portion, and a horizontal portion formed therein, an elevator provided on the inclined portion to elevate and lower the paper, a paper feed roller for feeding the paper, and the triangular portion. Provided with a stopper having a rotatable protrusion,
A paper feeding device, wherein the triangular portion is formed integrally with the base. 2. The front end surface of the paper is in contact with the rising portion of the triangular portion before the paper is fed, and the front end surface of the paper is in contact with the protrusion when the paper is fed. 1 paper feeding device. 3. The paper feeding device according to claim 1, wherein a plurality of the triangular portions are provided at predetermined intervals so as to be aligned substantially parallel to the leading end surface of the paper.