JPH09278193A - Sheet guiding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the sheet guiding device which can magnify a discrimination effect even when a medium remaining in a sheet guide frame is small in quantity. SOLUTION: This sheet guiding device is provided with a sheet guide frame 11 housing a medium 12, a sheet guide 17 which is supported so as to be freely rocked within the sheet guide frame 11, and holds the medium 12, a hopping roller 15 which is disposed while being faced to the forward wall 11b of the sheet guide frame 11, and is supported in such a way as to be freely rotated, an energizing means pressing the medium 12 against the hopping roller 15 by way of the sheet guide 17, and with a friction member which is disposed while being adjacent to the tip end of the forward wall 11b of the sheet guide frame 11, and discriminates the medium 12 together with the hopping roller 15. An inclined surface is formed at the tip end of the sheet guide 17. The medium 12 set in the sheet guide frame 11 is pressed against the hopping roller 15 at all times by the energizing means by way of the sheet guide 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet guide device.

[0002]

2. Description of the Related Art Conventionally, a serial printer is provided with a cut sheet feeder, and by setting a plurality of media in the cut sheet feeder, it becomes possible to continuously supply the media to a printer mechanism. ing. A sheet guide device is arranged in the cut sheet feeder to guide the medium.

FIG. 2 is a first state diagram of a sheet guide device of a conventional cut sheet feeder, and FIG. 3 is a second state diagram of a sheet guide device of a conventional cut sheet feeder. In the figure, 11 is a sheet guide frame for accommodating a medium 12, and the sheet guide frame 1
1 comprises a bottom wall 11a and a front wall 11b. Further, 13 is a pressure spring, 15 is a hopping roller which is rotatably supported so as to face the tip of the front wall 11b.
Reference numeral 6 denotes a brake shoe provided at the tip of the front wall 11b so as to be in contact with the hopping roller 15, and 17 denotes a sheet guide which is swingably supported in the sheet guide frame 11 and holds the medium 12.

The pressure spring 13 constantly presses the medium 12 set on the sheet guide frame 11 against the hopping roller 15 via the sheet guide 17. Therefore, when a pulse motor (not shown) is driven by a signal from a controller (not shown) of the serial printer and the hopping roller 15 is rotated, the media 12 are separated and fed one by one.

In this case, the sheet guide frame 11 is prevented so that a plurality of media 12 are not fed at the same time.
The brake shoe 16 is disposed at the tip of the. The brake shoe 16 is made of a foamed body, has fine irregularities formed on the surface thereof, and has a front wall 11 of the seat guide frame 11.
It is arranged at an angle set with respect to b. Therefore,
The uppermost medium 12 in the sheet guide frame 11 is conveyed by friction between the sheet guide frame 11 and the hopping roller 15. However, the tips of the second and subsequent mediums 12 collide with the surface of the brake shoe 16 to cause bubbles. It will not be transported because it will be caught in the unevenness of the.

[0006]

However, in the conventional sheet guide device described above, when the amount of the medium 12 remaining in the sheet guide frame 11 becomes small,
The medium 12 after the second sheet is conveyed together with the medium 12 on the top. That is, as shown in FIG. 2, when the amount of the medium 12 remaining in the sheet guide frame 11 is large, the sheet guide 17 is pushed down by the medium 12 provided between the sheet guide frame 11 and the hopping roller 15. The medium 12 and the bottom wall 11a of the sheet guide frame 11 are substantially parallel to each other.

As a result, as for the angle at which the tip of the medium 12 abuts on the surface of the brake shoe 16, that is, the abutting angle θ, the maximum amount (full capacity) of the medium 12 is set in the sheet guide frame 11. If 145
It becomes [°]. On the other hand, as shown in FIG. 3, when the amount of the medium 12 remaining in the sheet guide frame 11 becomes small, the sheet guide 17 is pushed up by the pressure spring 13, so that the medium 12 moves toward the sheet guide frame 11. It is inclined with respect to the bottom wall 11a.

As a result, the abutting angle θ becomes large, for example, 158 ° when the last medium 12 in the sheet guide frame 11 is fed. by the way,
The discrimination effect for separating the media 12 one by one by the hopping roller 15 and the brake shoe 16 depends on the abutting angle θ, and becomes smaller as the abutting angle θ increases. As a result, double feeding, jamming and the like occur.

The present invention solves the problems of the conventional sheet guide device and provides a sheet guide device capable of increasing the discrimination effect even when the amount of the medium remaining in the sheet guide frame is small. The purpose is to do.

[0010]

To this end, in the sheet guide device of the present invention, a sheet guide frame for accommodating a medium and a sheet guide for supporting the medium swingably in the sheet guide frame are provided. A hopping roller which is arranged to face the front wall of the sheet guide frame and is rotatably supported; biasing means for pressing a medium against the hopping roller via the sheet guide; and a front portion of the sheet guide frame. The hopping roller is disposed adjacent to the tip of the wall, and has a friction member that discriminates the medium together with the hopping roller.

An inclined surface is formed at the tip of the sheet guide.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view of a sheet guide device according to an embodiment of the present invention, and FIG. 4 is a detailed view of the sheet guide device according to an embodiment of the present invention. In the figure, 11 is a sheet guide frame for accommodating a medium 12, and the sheet guide frame 11 comprises a bottom wall 11a and a front wall 11b. Further, 13 is a pressure spring as an urging means, and 15 is the front wall 1
A hopping roller 16 is rotatably supported so as to face the tip of the front wall 1b, and the hopping roller 16 is adjacent to the tip of the front wall 11b.
A brake shoe 17 serving as a friction member disposed in contact with the hopping roller 15 is swingably supported in the sheet guide frame 11, and a medium 12 is provided.
Is a sheet guide for holding.

The pressure spring 13 constantly presses the medium 12 set on the sheet guide frame 11 against the hopping roller 15 via the sheet guide 17. Therefore, when a pulse motor (not shown) is driven by a signal from a controller (not shown) of the serial printer and the hopping roller 15 is rotated, the media 12 are separated and fed one by one.

In this case, the sheet guide frame 11 is prevented so that a plurality of media 12 are not fed at the same time.
The brake shoe 16 is disposed at the tip of the. The brake shoe 16 is made of a foamed body, has fine irregularities formed on the surface thereof, and has a front wall 11 of the seat guide frame 11.
It is arranged at an angle set with respect to b. Therefore,
The uppermost medium 12 in the sheet guide frame 11 is conveyed by friction between the sheet guide frame 11 and the hopping roller 15. However, the tips of the second and subsequent mediums 12 collide with the surface of the brake shoe 16 to cause bubbles. It will not be transported because it will be caught in the unevenness of the.

When the amount of the medium 12 remaining in the sheet guide frame 11 decreases, the sheet guide 17 is pushed up by the pressure spring 13, so that the medium 12 is inclined with respect to the bottom wall 11a of the sheet guide frame 11. To be made. In this case, when the abutting angle θ increases, the discrimination effect decreases accordingly,
Double feed and jam will occur.

Then, the taper surface 17a is formed as an inclined surface by slightly cutting the tip of the sheet guide 17 so that the abutting angle θ does not become large.
As shown in FIG. 4, the sheet guide 17 is usually provided with a friction plate 18 so that the lowermost medium 12 and the sheet guide 17 do not rub, so that only the tip of the friction plate 18 is provided. The tapered surface 17a can also be formed. Then, when the maximum amount (full capacity) of the medium 12 is set in the sheet guide frame 11, the inclination angle Θ of the sheet guide 17 is set to α, and the last medium 12 in the sheet guide frame 11 is fed. When the inclination angle Θ of the sheet guide 17 is β, the tip angle γ of the tapered surface 17a is γ = β-α. When α = 145 [°] β = 158 [°], γ = 13 [°].

Next, the operation of the sheet guide device having the above construction will be described. FIG. 5 is a first state diagram of the sheet guide device according to the embodiment of the present invention, and FIG. 6 is a second state diagram of the sheet guide device according to the embodiment of the present invention. As shown in FIG. 5, when the maximum amount of the medium 12 is set in the sheet guide frame 11, the tip of the medium 12 maintains its shape due to the weight and waist of the medium 12 itself and the influence of the tapered surface 17a. Do not receive Therefore, the tip of the medium 12 strikes the surface of the brake shoe 16 at the abutment angle θ θ = α, which is the same as the inclination angles Θ and Θ = α of the sheet guide 17 main body.

Then, as the printing is repeated, the amount of the medium 12 remaining in the sheet guide frame 11 decreases, and the inclination angle Θ of the main body of the sheet guide 17 gradually increases, but the weight of the medium 12 itself decreases. Since the stiffness also disappears, the tip of the medium 12 is influenced by the tapered surface 17a and gradually curves along the tapered surface 17a.

As a result, the abutting angle θ does not change. Furthermore, when printing is repeated and the last medium 12 is fed, the front end of the medium 12 is completely curved along the tapered surface 17a. At this time, the inclination angle Θ of the sheet guide 17 main body
Is Θ = β, the abutment angle θ is smaller than the tilt angle Θ by the tip angle γ, and θ = Θ−γ = β−γ.

However, since the tip angle γ is γ = β-α, the abutting angle θ is θ = β- (β-α) = α.

Therefore, the abutting angle θ can be maintained at the value when the maximum amount of the medium 12 is set in the sheet guide frame 11. The sheet guide 17 is rotated about the fulcrum depending on the amount of the medium 12 remaining in the sheet guide frame 11, and the inclination angle Θ of the sheet guide 17 itself linearly changes. On the other hand, the weight and waist of the medium 12 also change substantially linearly in proportion to the number of the medium 12.

In this embodiment, the tapered surface 17a is formed as the inclined surface, but a curved surface can be formed instead of the tapered surface 17a. Next, the influence of the thickness of the medium 12 on the sheet feeding when the amount of the medium 12 remaining in the sheet guide frame 11 is small will be described. FIG. 7 is a third state diagram of the sheet guide device according to the embodiment of the present invention, and FIG. 8 is a fourth state diagram of the sheet guide device according to the embodiment of the present invention.

In the figure, 12 is a medium, 15 is a hopping roller, 16 is a brake shoe, and 17 is a sheet guide. Whether the thick medium 12 is used as shown in FIG. 7 or the thin medium is used as shown in FIG.
The medium 12 can be abutted on the surface of the brake shoe 16 at the same abutment angle θ. That is, the thickness of the medium 12 has almost no influence on the sheet feeding.

The present invention is not limited to the above-mentioned embodiments, but can be variously modified based on the spirit of the present invention, and these are not excluded from the scope of the present invention.

[0025]

As described above in detail, according to the present invention, in the sheet guide device, the sheet guide frame for accommodating the medium and the medium which holds the medium swingably in the sheet guide frame are held. A sheet guide, a hopping roller that is disposed so as to face the front wall of the sheet guide frame and is rotatably supported, a biasing unit that presses a medium against the hopping roller through the sheet guide, and the sheet. A friction member is disposed adjacent to the front end of the front wall of the guide frame, and discriminates the medium together with the hopping roller.

An inclined surface is formed at the tip of the sheet guide. In this case, the urging means constantly presses the medium set in the sheet guide frame against the hopping roller via the sheet guide. Therefore, when the hopping roller is rotated, the medium
Sheets are separated and fed.

Further, the uppermost medium in the sheet guide frame is conveyed by friction with the hopping roller, but the second and subsequent mediums are not conveyed because the front end abuts against the surface of the friction member. . When the maximum amount of medium is set in the sheet guide frame, the tip of the medium maintains its shape due to the weight of the medium itself and the waist, and is not affected by the tapered surface. Therefore, the leading edge of the medium strikes the surface of the friction member at the abutment angle that is the same as the inclination angle of the sheet guide body.

Then, as the printing is repeated, the amount of the medium remaining in the sheet guide frame decreases and the inclination angle of the sheet guide body gradually increases.
Since the weight of the medium itself decreases and the stiffness disappears, the tip of the medium is influenced by the tapered surface and gradually curves along the tapered surface. As a result, the butting angle does not change.

Therefore, since the abutting angle can be maintained at the value when the maximum amount of medium is set in the sheet guide frame, the discrimination effect can be increased. As a result, double feeding and jamming will not occur.

[Brief description of drawings]

FIG. 1 is a side view of a sheet guide device according to an embodiment of the present invention.

FIG. 2 is a first state diagram in the sheet guide device of the conventional cut sheet feeder.

FIG. 3 is a second state diagram of the sheet guide device of the conventional cut sheet feeder.

FIG. 4 is a detailed view of the sheet guide device according to the embodiment of the present invention.

FIG. 5 is a first state diagram of the sheet guide device according to the embodiment of the present invention.

FIG. 6 is a second state diagram of the sheet guide device according to the embodiment of the present invention.

FIG. 7 is a third state diagram of the sheet guide device according to the embodiment of the present invention.

FIG. 8 is a fourth state diagram of the sheet guide device according to the embodiment of the present invention.

[Explanation of symbols]

 11 Seat Guide Frame 11b Front Wall 12 Medium 13 Pressure Spring 15 Hopping Roller 16 Brake Shoe 17 Seat Guide 17a Tapered Surface

Claims (1)

[Claims] 1. A sheet guide frame for accommodating a medium, and a sheet guide for supporting a medium, which is swingably supported in the sheet guide frame.
(C) a hopping roller which is disposed so as to face the front wall of the sheet guide frame and is rotatably supported;
(D) urging means for pressing the medium against the hopping roller via the sheet guide, and (e) friction arranged to be adjacent to the tip of the front wall of the sheet guide frame and discriminating the medium together with the hopping roller. And (f) an inclined surface is formed at the tip of the sheet guide.