JPH0435310Y2 - - Google Patents

Description

[Detailed explanation of the invention] <Industrial field of application> This invention relates to a paper feeding device. More specifically, this invention is related to a paper feeding device, and more specifically, it transmits conveying force to the paper by a paper feeding roller, and is installed coaxially with the paper feeding roller. The present invention relates to a paper feeding device that guides the paper while holding the edge thereof using auxiliary rollers.

<Prior art> Conventionally, such a paper feeding device has a groove formed at a predetermined position on the rotating shaft of the paper feeding roller, and an E
A stopper ring such as a ring or a G-ring is attached to hold the auxiliary roller in a specified position, and a boss is formed at a specified position.
A device in which the auxiliary roller was fixed using this boss portion as a stop was adopted.

<Problems to be solved by the invention> In each of the above-mentioned conventional paper feeding devices, not only is it necessary to form a groove or a boss portion, but also members such as a stopper ring are required, resulting in a complicated structure. There is a problem in that not only does this cause problems, but also that the holding operation of the auxiliary rollers becomes complicated.

Furthermore, it is necessary to mount the auxiliary roller at a position where the guide member constituting the paper feed path does not get in the way, and there is a problem in that the accuracy of auxiliary roller mounting must be increased.

<Purpose of the invention> This invention was made in view of the above-mentioned problems, and aims to provide a paper feeding device that allows easy installation of auxiliary rollers and simplifies the installation structure of the auxiliary rollers. is intended to provide.

<Means for Solving the Problems> In order to achieve the above object, the paper feeding device of this invention has a lower guide member and an upper In a paper feeding device configured to lead to a paper feeding path composed of a guide member, the upper guide member is formed at a position not facing the paper feeding roller, protruding toward the rotating shaft side of the paper feeding roller, and spaced apart from each other by a predetermined distance. The auxiliary roller is provided with a plurality of protrusions, and an auxiliary roller that is loosely inserted into the rotating shaft of the paper feed roller so as to be freely slidable in the axial direction.
A predetermined portion of the rotary shaft away from the paper feed roller is arranged between a pair of adjacent predetermined protrusions, and these protrusions restrict the rotation shaft from sliding more than a predetermined amount in the axial direction. It is characterized by being held in place.

<Function> If the paper feeding device has the above configuration, the auxiliary rollers,
With the axial position of the rotating shaft roughly set, the auxiliary rollers are simply placed between a predetermined pair of adjacent protrusions, and the auxiliary rollers are aligned with the axis of the rotating shaft by the pair of protrusions. It is installed in a state where the slide in the direction more than a predetermined amount is regulated. Therefore, the auxiliary roller can be attached without requiring any special member for positioning the auxiliary roller, such as a conventional stopper ring, making the attachment extremely easy.

<Examples> Hereinafter, examples will be described in detail with reference to the accompanying drawings showing examples.

FIG. 2 is a schematic diagram of a copying machine equipped with a paper feeding device, in which a stack bypass mechanism, designated as a whole by reference numeral 1, is provided on the right side of the copying machine in the drawing. A limit switch 3 is provided at the bottom of the paper holder 2, and a limit switch 3 is provided at the top of the paper holder 2, and the copy paper P comes into contact with the paper holder 2 in order along the paper transport direction. In some cases, the guide member 4 rotates in a direction opposite to the copy paper pressing direction (clockwise in the figure).
The guide member 4 is movable up and down along the direction of a long hole 6 provided in the side plate of the paper feed section, and as the guide member 4 rotates, its shaft is lifted upward, and the limit switch 3 It consists of a forward feed roller 5 which begins to rotate upon detecting the leading edge of the sheet P and conveys the copy paper P to the leading end of the paper holder 2, and a paper feed roller 7 provided at the leading end of the paper holder 2. The paper feed roller 7 waits in contact with the copy paper P until copying is started by pressing a copy start button (not shown). At the bottom of the paper feed roller 7, a friction pad 8 for preventing double feeding is configured to be pressed into contact with the paper feed roller 7 by a biasing means such as a spring 9.

The copy paper P conveyed from the stack bypass mechanism 1 into the copying machine by the paper feed roller 7 passes through the paper feed path formed by the upper and lower guide plates 10, 10, and is transferred to the upstream side of the registration roller 12 in the copy paper conveyance direction. A limit switch 11 is provided for detecting the leading edge of copy paper.
After a predetermined period of time has elapsed, the conveyance of the copy paper P is temporarily stopped at the registration roller 12, and then the copy paper P is conveyed, thereby correcting the skew feeding of the copy paper P and adjusting the timing with the exposure system. There is. Copy paper P conveyed from registration roller 12
is conveyed to the transfer section T through a conveyance path formed by the upper and lower guide plates 13, 13, in order to transfer the toner image formed on the photoreceptor drum 14 onto the copy paper P.

Further, a copy paper supply cassette 15 is attached to a cassette receiving portion 16 at the bottom of the copying machine main body. The copy paper supply cassette 15 is provided with a paper loading plate 17 and a push-up plate 19 that urges the paper loading plate 17 from below to bring the upper end of the copy paper into contact with the paper feed roller 18. Paper feed roller 18
A friction pad 20 is brought into contact with the lower part of the sheet P, and the copy sheets P are fed one by one to the conveyance path. The copy paper P supplied from the copy paper supply cassette 15 is conveyed to the transfer section T as shown by the one-dot chain line. That is, a conveyance path 21, a conveyance roller 22, a lower roller 23 pressed into contact with the conveyance roller 22 by a leaf spring 24, and a conveyance path 25 are provided in this order along the conveyance direction, and the conveyance path 25 is connected to the upper and lower guide plates 10, 10. It merges into the conveyance path formed in this way.

Next, referring to FIG. 1, install the copy paper supply cassette 1.
The copy paper feeding mechanism from No. 5 will be explained in more detail.

The paper feed path 21 includes a lower guide member 26 and an upper guide member 27 that also serves as a support member for the conveyance roller 22.
It is composed of. Then, the upper guide member 2
7 is formed by integral molding of synthetic resin, and in the direction perpendicular to the conveyance direction of the copy paper P,
By alternately forming a plurality of protrusions 28 and grooves 29, friction with the copy paper P is reduced. The protrusion 28 is formed in such a shape that only the portion directly facing the paper feed roller 18 is cut out in advance so as not to come into contact with the paper feed roller 18.
The remaining portion protrudes toward the copy paper supply cassette 15 and intersects with an imaginary plane extending from the outer surface of the paper feed roller 18.

Furthermore, an auxiliary roller 31 having the same diameter as the paper feed roller is attached to a predetermined position of the rotation shaft 30 to which the paper feed roller 18 is attached, so as to be slidable in the axial direction of the rotation shaft 30. copy paper P
The guide can be reliably guided while the end is pressed.

Therefore, when installing the paper feed roller 18, rotation shaft 30, and auxiliary roller 31, the paper feed roller 1
8 is positioned so that it directly faces the friction pad 20, and the auxiliary roller 31 is positioned (however,
(In this state, the auxiliary roller 31 is only temporarily positioned and may slide.) After that, the rotating shaft 30 may be rotatably mounted at a predetermined position on the main body of the copying machine. The roller 31 has its outer peripheral edge aligned with the corresponding pair of protrusions 2.
By being located between 8 and 8, free sliding is restricted, that is, the position is completely positioned.

After that, the rotating shaft 30 is driven by a drive source (not shown).
By rotating the paper feed roller 18 and the friction pad 2,
0, it is possible to reliably transport the copy sheets P one by one.

Note that this invention is not limited to the above-mentioned embodiment. For example, instead of forming the protrusion 28 by forming the groove 29, the protrusion may be formed by arranging a plurality of plate materials together. In addition, various design changes can be made without changing the gist of the invention.

<Effects of the invention> As described above, this invention is capable of holding the auxiliary roller at a predetermined position on the rotating shaft by a pair of adjacent predetermined protrusions on the upper guide, which is superior to conventional stopper rings, etc. This provides a unique practical effect in that the auxiliary roller can be easily attached without requiring any special member for positioning the auxiliary roller.

[Brief explanation of drawings]

FIG. 1 is a schematic view showing an embodiment of the paper feeding device of this invention, and FIG. 2 is a longitudinal sectional view showing the main parts of the copying machine. 18...Paper feed roller, 26...Lower guide member, 2
7...Upper guide member, 28...Protrusion, 30...Rotating shaft, 31...Auxiliary roller.

Claims (1)

[Claims for Utility Model Registration] In a paper feeding device in which paper conveyed by a paper feeding roller fixed at a predetermined position on a rotating shaft is guided to a paper feeding path composed of a lower guide member and an upper guide member. , a plurality of protrusions formed on the upper guide member at a position not facing the paper feed roller so as to protrude toward the rotation shaft side of the paper feed roller and spaced apart from each other by a predetermined distance; It is equipped with an auxiliary roller that is loosely inserted in a free state, and the auxiliary roller is arranged between a pair of adjacent predetermined protrusions, and these protrusions allow the rotating shaft to slide by a predetermined amount or more in the axial direction. A paper feeding device characterized in that the rotating shaft is held at a predetermined position away from a paper feeding roller in a regulated state.