JPS60171939A - Paper feeder for picture image forming device - Google Patents

Abstract

PURPOSE:To enable cassette paper feed while adapting to a carrying device having oblique feed roller and referential guide by releasing the trailing edge of sheet from the sideface limiting member upon feeding of the leading edge of sheet to the position of pressing means through function of paper feed means. CONSTITUTION:A sideface limiting member 15 for limiting the sideface of paper when containing paper is provided to be released immediately before passing of paper to an oblique feed roller 7 thus to never limit the paper after passing to the oblique feed roller 7. The sideface limiting member 15 is formed such that the distance L2 from the trailing edge of paper to the front end of one sideface limiting member 15 under containment of paper will be shorter than the carrying distance L1 between paper feed operation and completion of process. Consequently, cassette paper feed is enabled while adapting to a carrying system having oblique feed roller and referential guide and the structure for positioning the paper feed cassette is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding device in an image forming apparatus, and more particularly, to a paper feeding device using a paper feeding cassette in an image forming apparatus such as a copying machine or a printing device.

In such an image forming apparatus, in order to form a correct image on a sheet such as copy paper, the sheet must be correctly guided and fed into the image forming apparatus.

For this reason, conventional paper feeding devices in which a paper cassette is loaded into the conveyance device of an image forming apparatus have been provided with a sheet running standard guide inside the paper cassette to prevent sheets from shifting in the lateral direction. . The side regulating plate (sheet running reference kite) 2 of this paper feed cassette l is @1
As shown in the figure, it extends long in the paper feeding direction so that the sheet can always be restrained until the paper feeding is completed.

Therefore, when such a paper feed cassette is used by loading it into a conveyance device having a skew feeding roller and a running reference guide, there is a problem that paper jams are likely to occur due to skew feeding and poor paper feeding. was there.

That is, as shown in FIG. 2, the paper sent out from the paper feed cassette 1 by the action of the paper feed roller 3 and the separation claw 4 is conveyed as shown by arrow A, and the paper is conveyed as shown by arrow B by the diagonal feed roller 7. Although the force is applied, the movement of the paper is regulated by the side regulating plate 2, so the paper is fed obliquely as shown by arrow C by the action of the oblique feed roller 7. Therefore, the original functions of the oblique feed roller 7 and the reference guide 8 cannot be fully demonstrated, and the above-mentioned problems are likely to occur.

Incidentally, the skew feeding roller and the reference guide are particularly effective in the case of manual paper feeding, and since the paper is fed while being pressed against the side surface of the paper or the base lug kite, skewing or the like does not occur.

The present invention has been made in view of the above-mentioned drawbacks of the conventional example, and provides a paper feeding device in which a paper feeding cassette is loaded into a conveying device equipped with an oblique feeding roller and a reference guide so that paper can be accurately fed. The purpose is to provide.

Hereinafter, the present invention will be explained based on the illustrated embodiments.

FIG. 3 is a perspective view of one embodiment of a paper feed cassette constituting the paper feed device according to the present invention, and in the figure, 11 is a paper feed cassette, 12 is a middle plate, 13 is a spring, and 14 is a separation claw. .

Then, by pushing up the middle plate 12 with the /hene 13, the sheets stacked on the middle plate 12 are pushed up.

The separation claw 14 has the function of keeping the paper constant by coming into contact with the upper part of the paper surface pushed apart by the intermediate plate 12 and the spring 13, and also has the function of separating only the topmost paper during paper feeding. . Note that after the paper is released from the separation claw 14, the side surface of the separation claw 14 is designed to be always lower than the top of the paper so that the side surface of the paper is not restricted.

Further, reference numeral 15 denotes a side regulating plate that regulates the side surface of the paper when storing the paper, and is released immediately before the fed paper is transferred to the diagonal feed roller 7, and after being transferred to the diagonal feed roller 7, the plate is released. It is designed not to impose any restrictions on paper.

Reference numeral 16 denotes a rear regulating plate for the stored paper, which prevents the stored paper from being attached to and removed from the separating claw 14 during paper storage.

Furthermore, in FIG. 4, reference numeral 7 denotes a guide for defining a paper reference, and is a skew feed roller that works in cooperation with a reference guide 8 to correct the skew of paper feed, control the running position, and convey the paper. Reference numeral 3 denotes a roller for transferring the paper stored in the paper feed cassette 11 to the diagonal feed roller 7, which is called a paper feed roller. This paper feed roller 3 is composed of a half-moon-shaped rubber roller, and has the function of transporting the paper from the cassette 11 to the diagonal feed roller 7. At the same time, after the conveyance operation is completed, it does not come into contact with the paper surface, and the diagonal feed roller 7, so that no binding force is applied to the paper being fed.

In the above configuration, when the paper feed roller 3 operates, the uppermost paper is fed by the separation claw 14 to the position of the oblique feed roller by being given a feeding force as shown by arrow A' in FIG. At this time, the restriction on paper feeding by the side regulating plate 15 is released,
A feeding force is applied to the paper by the oblique feeding roller 7 in the direction shown by the arrow B'. Therefore, the side surface of the paper is always pressed against the surface of the reference guide 8, and the paper can be fed while correcting the skew. (Arrow C').

In other words, the distance IIIL1 conveyed at the completion of the paper feeding operation (until the leading edge of the paper reaches the oblique feed roller 7 due to the rotation of the paper feeding roller) is longer than the front end of one side regulating plate 15 from the trailing edge of the paper when the paper is stored. This is because the side regulating plate 15 is formed so that the distance 1111 L 2 to the surface is shorter. However, it is sufficient that either one of the side regulating plates 15 satisfies this condition. Note that ΔX is a gap formed between the reference guide 8 and the side regulating plate 15.

In the above embodiment, the side surface of the separating claw and the base plate are kept lower than the height of the paper feeding surface in order to eliminate the lateral restraint on the paper during paper feeding, but the paper feeding timing is controlled mechanically or using a sensor. You may also measure your time as you go. In other words, the side butts operate to restrain the sides of the paper until just before the paper is delivered to the skew feed roller, and then, after the paper is delivered to the skew feed roller, the restraints are released and the paper is Even if a mechanism that eliminates the constraint is used, it is possible to feed paper in the same manner as in the above embodiment in a system having an oblique feed roller and a base (guide).

Further, as shown in FIG. 5, the paper feed roller 13 may be configured to form a unit when the paper feed cassette 21 and the nails 24 are fastened together, and the paper feed roller 13 may be detachably attached to the conveying device. In other words, with this configuration, it is also possible to perform automatic paper feeding using a manual paper feeding conveyance device that includes only the oblique feed roller 7 and the reference guide.

As described above, the paper feeding device according to the present invention is configured to use a cassette that releases the lateral restraint of the paper after paper feeding. This has the advantage that it is possible to feed paper in a cassette while adapting it to the conveyance system that it has.

Furthermore, even if the paper feed cassette is not loaded into the transport device 6 with such high precision, the paper can be fed correctly. Therefore, the structure for positioning the paper feed force sensor l' is simplified, and the apparatus can be made smaller and simpler.

In addition, since there is no need for accuracy when installing the cassette I, and for positioning the paper feeding device itself when connecting the paper feeding device including the cassette to the printer as an option (external feeder), the attachment/detachment mechanism is simpler and cheaper ( This has the effect of reducing costs (low cost).

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional paper feed cassette, and Figure 2 is a perspective view of a conventional paper feed cassette.
FIG. 3 is a plan view illustrating the paper feeding operation when using the cassette shown in FIG. 3; FIG.
FIG. 4 is a plan view illustrating the paper feeding operation when the cassette shown in FIG. 3 is used, and FIG. 5 is a side sectional view of another embodiment. 3.13...Paper feed roller 7...Diagonal feed roller 8...
・・・・・・・・・・・・Driving standard guide 11・・・・
・・・・・・Paper cassette 14・・・・・・・・・
...Separation claw 15...Side regulation plate Applicant: Canon Co., Ltd. Figure 1, Exhibit 2

Claims (3)

[Claims] (1) A sheet-shaped travel reference guide, means for pressing the side surface of the sheet against the guide, and a paper feeding means for feeding the sheet from the tray and feeding it to the means; A sheet feeding device in a forming apparatus, comprising: a side regulating coffin member that guides the side surface of a stored sheet; (2) The paper feeding device described in the patent is characterized in that the paper feeding means is arranged on the side of the paper feeding cassette. (3) Claims (1) to (3) described in Claim (1), characterized in that the paper feeding means is disposed on the side of the suppressing means. A paper feeding device according to any of paragraphs.