JPS617149A - Paper feeding cassette - Google Patents

Abstract

PURPOSE:To make improvements in functionability, equilibration and stability, by coupling a pressure receiving plate, giving pushing force to a paper mounting tray of a paper feeding cassette, loosely within an interval between a pair of paper feeding opposite substances to oppositely come into contact with the pressure receiving plate, and installing it in a way of making its equilibrating motion attainable. CONSTITUTION:A paper feeding cassette 1 is provided with a tray 25 supporting the nearly first half part of paper in its bottom part, and this tray 25 is supported by a spring 34 so as to make it rotatable upward around a pin 33. In this case, a pressure receiving plate 11, giving pushing force to deliver the paper forward, is installed in this tray 25. This pressure receiving plate 11 has a hollow 12 in the central part, and a through hole 16 consisting of both opposed- form concave and convex parts 14 and 15 is formed on this bottom 13, while both upper and lower tension members 17 and 21 are installed with this through hole 16 held in between and coupled together with a screw 20. And, this screw 20 is screwable in any of tapped holes 27-29 formed in a hollow part 26.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to paper feeding force, and in particular, to a paper feeding force suitable for obtaining a predetermined conveying force for sheets of different sizes, for example, with one side combined. It concerns paper power cents.

[Background of the invention]

In conventional paper feed cassettes, in order to apply conveying force to the paper, pressure is applied to the paper tray, and in order to prevent the paper tray from deforming, the board is made thicker or made of plastic. Containers for paper feed cassettes, etc., also need to have a robust structure, and many materials are used to obtain the required conveyance force.

However, even with the above method, there may be cases where it is difficult to maintain the balance necessary to obtain the specified conveying force due to the finishing accuracy of each part or the deformation of the molded product, and advanced parts management is required. This is what I used to do.

[Purpose of the invention]

The present invention has been developed in view of the above, and aims to provide a paper feeding cassette that can reduce the amount of materials used, improve functionality, maintain balance, and ensure stability during long-term use. This is the purpose.

[Summary of the invention]

The configuration of the paper feed sumo wrestler's throat according to the present invention is such that a pressure receiving plate that applies a pushing force for feeding out the paper is attached to the paper feeding cassette which is provided with a plate on which the paper is placed. A pair of paper feeding contact objects facing each other on the plate are loosely coupled within the space between them, and the pressure receiving plate is operated in equilibrium in a direction perpendicular to the paper feeding direction using the loosely coupled portion as a fulcrum. It is configured so that it can be performed.

Further details are as follows.

In a paper feed cassette, for example, a balanced pressure force is required between a pair of rollers or rollers used for paper feeding and the paper that is sequentially extracted. Uniform conveying force is desirable.

However, on the surface of the roller or roller mentioned above,
If the plate on which the paper is placed is even slightly tilted and the pressure force is unbalanced, it will be difficult to convey the paper in a balanced manner. In order to prevent such unbalanced conveyance, a so-called heckler device is added to obtain a predetermined balanced or unbalanced pressing force.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the paper feed system according to the present invention will be described with reference to the drawings.

FIG. 1 is a plan view of a paper feeding cassette according to an embodiment of the present invention, FIG. 2 is a plan view illustrating the relationship between the paper feeding cassette and paper, and FIG. 3 is a plan view of the paper feeding cassette. 4-5 is a front view of the main part showing the related structure with paper feeding rollers, FIG. 6 is a side view of the paper feeding cassette, and FIG. FIG. 8 is a side view showing various aspects of the mounting.

However, the paper feed cassette of this embodiment is for a laser beam printer, and since the laser beam printer outputs information on one side, the paper feed cassette of this embodiment is also designed to match this. Explain things.

That is, the details will be described later in 1. In Fig. 1, ] is the paper feeding sumo wrestler soi, and 2 is ( related to the reference line).
4111 line, which is a temporary resting line that touches the inside of the side plate 9.

IJ is the pressure receiving plate, 14.14-3 is the four parts, 1G is the penetration part,
17 ke, part of the holding part missing, 20' fd, 200 heads of male screws (described later), 23.24 cork plate, 25 plate, 26 1 part, 32 hanging part, 33 bottle, 35 holder. Part 1, 3
G is a bottle, and 37 is a locking claw member.

Therefore, the plate 25 is a sheet of paper (hereinafter referred to as paper).

), and the pressure receiving plate J1 applies a pushing force to the plate 25 to feed out the paper.

Next, first, the paper feeding posture will be explained with reference to FIG.

That is, FIG. 2 is a side view of paper of various sizes stored in the paper feed cassette (hereinafter referred to as cassette) 1, and each paper A of 6 sizes from A3 to A.
, 3. A, 4. A5 and A6 are so-called one-sided paper feeders in which the side surface 4 is aligned with the side line 2.

Then, on the shaft 3 which is rotatably arranged at a predetermined position on a separate bearing (not shown), there is a shaft 3 having the same shape and a large percentage of the friction coefficient, which is related to the phantom sheet feeding contact object. Paper feed rollers (single (referred to as rollers) 5 and 6 made of Y and Q elastic bodies are fixed at a predetermined position at the width position of the paper A-6 of size 6-6).゜The shaft 3 is connected to the drive part through the electromagnetic flanges (not shown) when connecting the tongues 1, -1-, ζ-ji, etc. ('). (Then, the shaft 3 and the rollers 5 and 6 are rotated in a predetermined direction 1y to extract and convey the paper in the direction of the arrow 7 shown in the figure.)

However, the paper exists! II exit (7) When transporting, for example (.
1ZJ, fd, =t +:'+ 5 and 7. < The pressure contact state with 6 is unbalanced! Lee Katagori 5, both: 7 r'
If I is in contact with -, then the conveyance in the direction of arrow 7 can be performed without skew.

This is because the area of the paper is small and the resistance force due to mutual rubbing between the papers is also low.

Next, sizes A4 and A3 will be described.

In this case, for example, if the pressure contact force of the rollers 5 is strong and the rollers 6 are only in contact with each other, conveyance force by the rollers 6 cannot be expected, and the rear part of the paper is shown in the figure on the side of the rollers 5 where the pressure contact force is strong. The paper A4 or A3 is rotated in the direction of the arrow 8, causing a skew, and the rear side of the paper A4 or A3 rides on the side plate 9, causing it to be sent out in a deviated form, and the paper is forced into a limited conveyance path in the width direction of the paper. The paper cannot pass through the paper, resulting in a paper jam.

Papers A4 and A3 have a large area, and the conveying position, that is, the position of the conveying rollers, is biased in one direction, so the mutual sliding force is large in the areas where no conveying force is applied. The unbalance in the pressing forces of the rollers 5 and 6 causes an unbalance in the conveying force and causes a skew in the paper.

Here, in view of the above, the conveying force without causing skew was examined and found to be as follows.

That is, for example, the illustrated conveying force F1 on the roller 5 side is set to 20
0 g, and the conveying force F2 of roller 6 is 300 g,
The paper A3 could be delivered without any skew, and even if the conveyance force F2 was 400 g, the paper A3 could be delivered in a stable manner. Paper A4 was also sent out without any problems.

This is understood to mean that the illustrated force F3, which is the difference between the conveying forces F2 and Fl, acts on the portion where there is no conveying force.

In addition, to measure the above-mentioned conveying forces F1 and F2, each roller is rotated and held down, and a short plate-shaped paper is placed between the paper A4 and each of the rollers 5 and 6. A strip of paper was pressed and pulled out using a spring scale, and the balanced pulling force at that time was measured.

Although the above condition was intentionally created, it is impossible to always secure the above-mentioned conveying force by attaching actually manufactured parts.

Therefore, we have provided a structure according to the present invention. According to this structure, assembly is performed at a normal level, or a large margin for design accuracy is estimated, and furthermore, the number of materials can be reduced. This makes it possible to permanently maintain the state once set.

Next, the details of the caseno+-1 will be explained.

Press + to feed out the paper in cassette 1.
A pressure receiving plate 11 that applies lifting force and a plate 2 on which paper is placed
3 to 5, the configuration of the loose coupling portion with the pressure receiving plate 11 and the balance portion 10 that can perform the balancing operation of the pressure receiving plate 11 will be explained.

That is, in FIG. 3, the pressure receiving plate 11 is provided with a depression 12 in the center, and the bottom 13 is provided with opposing depressions 14.11-2.
．． 14-3 and a convex portion 15 are provided (7 to form a through portion 16).

In fact, near both ends of the pressure receiving plate 11, cork plates 23 and 24 are bonded at positions facing the rollers 5 and 6 described above.

7. Also, the partial holding member 17 is provided with an engaging portion 18 that is fitted into the recessed portion 14 in a loose manner, and further has a cross-shaped engagement shape that can penetrate the through portion 16, and A through hole 19 into which a male screw 20 is inserted is provided.

On the other hand, the lower pressing member 21 has a portion 21' that contacts the upper pressing member 17 in the same shape as described above, and a through hole 22 into which the male screw 20 is inserted is provided in the center.

A recess 26 is provided in the dish 25 in the case 1 so that the pressure receiving plate 11 can be accommodated and perform the prescribed operation, and tapped holes 27, 28, and 29 are provided so that the male screw 20 can be screwed into the tray 25. The recesses 1-4, 14-2, and 14-3 of the pressure receiving plate 11 are provided to match the pitch.

Note that the above-mentioned recess 12 of the pressure receiving plate 11 is formed by the head 20' of the male screw 20 when assembled according to the assembly diagram shown in FIG.
is set to a depth that is lower than the height of the pressure receiving plate 11.

Next, FIGS. 4 and 5 show that the pressure receiving plate J
1 is attached.

That is, the pressure receiving plate 11 is on the lower presser part 21, and is pushed up by the coil spring 34, which will be described later, by an upward force f'' P1.
When the plate 25 is set at a predetermined position by pushing down I7 with the plate 25, the plate 25 can be rotated freely in the direction of the arrow 30 in the fourth figure, exhibiting a so-called Yajirobe-like movement.

Next, in FIG. 4, the relationship between the plate 25, the pressure receiving plate 11, and the rollers 5 and 6 will be explained.

That is, a plurality of coil springs 3, which will be described later, are connected to the plate 25.
Pushing up pressure by 4 1) 1 and F2 acts, and the pressure is applied via the lower pressing member 21 to between the already mentioned cork plates 23 and 24 adhered to the soil of the pressure receiving plate 11 and each of the rollers 5 and 67. If the pressing pressures P3 and F4 are applied, and the distances between the rollers 5 and 6 are t1 and t2, respectively, with the lower pressing member 21 as the fulcrum, the moment from the lower pressing member 21 is t I X P 3. and t2XP4 are equal, so under the condition that t is 12, P 3 = P 4.
If the friction coefficient of 5 and 6 is μm, then the roller 5 mentioned earlier
and 6, respectively, are P3Xμm and P4Xμm, and since P3iP4, F1=F2, and the actual conveyance force is obtained by subtracting the resistance force due to the friction with the next-ranked beaver. However, since the conveyance forces PI and F2 are more than twice the value of the resistance force, they are sufficient conveyance forces to send out the paper.

However, as can be seen in Figure 2 above, the paper Ai and A3 are fed at a position about 100 mm from one side of the tip, so the conveying forces F1 and F2 are not the same value,
Conveying paper on the center side.

8J with large force F2: It is a bad thing.

Therefore, as shown in FIG. 5, the lower pressing member 21 is moved in the direction of the arrow 31, and the distances between the supporting point, which is a loose joint, and the rollers 5 and 6 are set to t3 and A4, respectively. If l 3 = 1.514, the moment equilibrium state is 1.5t4XP5 = t4Xt6, so P6 = 1.5t4XP5/14 = 1.5 P
It becomes 5.

That is, by changing the supporting position of the lower pressing member 21, the ratio of the pressing force applied to each of the rollers 5 and 6 can be set.

Therefore, the conveying force is also generated correspondingly, and the conveying forces F1 and F2 can be set to predetermined values.

In addition, if the structure is as described above, as shown in FIG.
Even if 5 is twisted as shown by the two-dot chain line or in the opposite direction, the pressure receiving plate 11 is not affected by the twisting, and the pushing pressures P1 and F2 change due to, for example, deformation of the plate 25 or cassette 1-1. Even if the pressure acting on the pressure receiving plate 11 changes, the pressure ratio set within the above-mentioned torsion tolerance does not change.

With the above settings, even if there is a difference between the conveying forces F1 and F2, the papers A5 and A86 will not be adversely affected in any way.

In addition, if the cassette 1 is dedicated to a specific paper size, the position of the lower presser member 21 may be set in the four vertical positions suitable for that size using the configuration shown in FIG. 3 above. It is something.

Next, FIG. 6 is a side view of paper A3 stored in the cassette 1 having the above-described configuration.

That is, as described above, side plates 9 are disposed facing each other at predetermined positions in the front center of the cassette 1, and each pin attached to the facing hanging portion 32 of the tray 25 on which paper can be placed is provided. 33 so that the plate 25 can rotate.

Further, a plurality of coil springs 34 are provided between the front part of the plate 25 and the bottom of the cassette, and the plate 25 is connected to the pin 33
It is designed to be biased so that it can be rotated around the center.

Further, as shown in the figure, a locking claw member 37 is attached to the side plate 9 by a pin 36, and a claw 38 is attached to the plate 2 by a spring (not shown).
The locking portion 35 of No. 5 is biased in the locking direction.

Then, the plate 25 is pushed down and positioned at the lowest position.
, the locking portion 35 is locked by the claw 38, and the coil spring 34
is compressed. Paper A3 is to be stored thereafter.

7 and 8 are side views of the cassette 1 installed in the paper feeding device of the printer.

That is, when the cassette 1 is first inserted into a predetermined position as shown in FIG. Then, it comes off from the locking part 35. Accordingly, the plate 25 is pushed up by the pushing force of the coil spring 34, and the paper Zper A3 comes into contact with a plurality of paper feed rollers 40 related to the paper feed counter installed at a predetermined position, and is in a pressed state. It is something that becomes.

The paper feed roller 40 is rotated in the direction of the arrow shown in the figure when feeding the paper, and the paper A3 is extracted and conveyed in the direction of the arrow pointing to the right in the figure, and the conveyed paper passes through the separating section 41, and the paper is In the case of feeding, the sheets are separated by a separating section 41 and sorted one by one.

Here, the separating section 41 includes a delivery roller 42. Exit member 4
3. Rubbing member 44. Stotsunony 41 fulcrum 46. It is composed of a pressure receiving part pin 47 and the like.

That is, the separating section 41 imparts rotation in the direction of the arrow shown in the figure to the delivery roller 42, and rotates the feed roller 42 from a leaf spring which is rotatably supported at a fulcrum 46 as shown in the figure with a sliding member 44 disposed thereon. When the cassette 1 is inserted into the pressure-receiving pin 47, a pushing pressure is applied to the ejecting member 43, and the ejecting member 43 is rotationally displaced, and the sliding member 44 moves the ejecting roller 4 with a predetermined pressure.
2.

Therefore, when double feeding of two sets of papers from the cassette 1 occurs, the frictional force of the rubbing member 44 holds back the paper of the next rank to prevent double feeding.

Next, FIG. 8 shows the posture of the paper A3 after it has been fed out in the attached state.

Note that by pulling out the cassette 1, the pressure receiving unit bin 4
7 is released, the retracting member 43 is rotated due to its own weight, and the sliding member 44 is separated from the delivery o-ler 42.
It is designed to come into contact with a stopper 45.

In FIGS. 7 and 8, a case using a pair of paper feed rollers 40 has been described, but the same applies to the case using the paper feed rollers described earlier.

As described above, the pressure receiving plate 11 is disposed at a predetermined position on the tray 25 which places Pei and S- in the cassette 1 and pressurizes the paper extraction reservoir. Board 11
The pressure receiving plate 1 is loosely connected to the
1, a plurality of rollers 5 and 6 or rollers 40 related to the object to be contacted are made to be able to come into contact with each other, the position of the loose coupling part is set within the interval of the object to be contacted, and the rollers 5 and 40 for that position are set. Since it is possible to obtain a pressing force that is inversely proportional to the ratio of the spacing between the rollers 5 and 6 or the rollers 40, even if the plate 25 and the cassette 1 are twisted in practical use, the rollers 5 and 6
Alternatively, the conveying force of the rollers 40 is always maintained at a set ratio, and when paper is extracted, there is no non-extraction or skew, and stable operation can be maintained.

Therefore, although the embodiment described in "-" is for a racer beam printer and relates to outputting information with one side printed, the present invention is also applicable to copying machines and the like.
It is a versatile item that can be used not only for one-sided alignment, but also for center alignment.

That is, in the case of centering, it is sufficient to provide a balance section in the center of the tray of the cassette.

〔Effect of the invention〕

According to the present invention, savings in materials used, improvement in functionality,
This invention can be said to have excellent practical effects since it is possible to obtain a sheet feeding force that can ensure balance and stability during long-term use.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a paper feeder according to an embodiment of the present invention, FIG. 2 is a plan view illustrating the relationship between the paper feeder and paper, and FIG. , Figures 4 and 5 are enlarged assembled perspective views of the main parts of the paper feed cassette, Figures 4 and 5 are front views of the main parts showing the related structure with the paper feed rollers, and Figure 6 is a side view of the paper feed cassette. 7 and 8 are side views showing various aspects of the mounting. DESCRIPTION OF SYMBOLS 1... Paper feeding cassette, 3... Shaft, 5, 6... Paper feeding roller, 9... Side plate, 10... Balance part, 11... Pressure receiving plate, 12... Hollow, 13 ...Bottom, j4.14-2.
14-3... Recessed part, 15... Convex part, 16... Penetrating part, 17... Upper pressing member, 18... Penetrating part, 1
9... Through hole, 20... Male screw, 21... Lower pressing member, 22... Through hole, 23.24... Cork plate, 25... Dish, 26... Recessed part , 27-29...
Tap hole, 32... Hanging part, 33° 36. 39... Pin, 34... Coil spring, 35... Series 1 Figure 3 also 4-Figure 5

Claims (1)

[Claims] 1. In a paper feeding cassette equipped with a tray on which paper is placed, a pressure receiving plate that applies a pushing force for feeding out the paper is attached oppositely to the tray. The pressure-receiving plate is configured to be loosely coupled within a gap between the pair of paper feeding objects, and to perform a balanced operation in a direction perpendicular to the paper feeding direction using the loosely coupled portion as a fulcrum. A paper feed cassette that is characterized by: 2. In the item described in claim 1, the pressure receiving plate is connected to the sheet feeding object by setting the position of the loose coupling part.
A paper feed cassette that is structured so that the required conveying force can be applied to each paper feed roller.