JPH1025033A - Paper feed roller mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily replace a paper feed roller from the front side of a device. SOLUTION: A paper feed roller 5 is constructed of a paper feeding roller unit 17, in which a roller which rotates while touching the upper face of a paper sheet in a paper feed tray so as to feed the paper sheet is fixed in a roller shaft 7, and a driving rotary shaft unit 18 which transmits a rotational force to the paper feed roller unit 17 on the depth side of a device main body. A shaft part 21 is formed in one end of the paper feed roller unit 17, while a shaft engaging hole 22, to which the shaft part 21 is inserted so as to be engaged, is formed in one end of the driving rotary shaft unit 18. The tip part of the shaft part 21 is formed into a tapering taper shaft part 21a, while a taper hole part 22a whose hole diameter is gradually reduced from the inlet toward the depth is formed in the inlet part of the shaft engaging hole 22. In this way, the paper feed roller unit 17 and the driving rotary shaft unit 18 are easily lugaged mutually by means of the taper parts formed in both of them.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feed roller mechanism for feeding a sheet of paper.

[0002]

2. Description of the Related Art An image forming apparatus such as a copying machine or a printer is provided with a paper feeding device for feeding a sheet of paper. Such a paper feeder is provided with a paper feed roller in which at least a surface layer is formed of a member having a high friction coefficient such as rubber and a paper feed roller is fixed on a roller shaft. The paper is continuously fed by rotating while being pressed against the upper surface of the paper stored in the tray. However, the paper feed roller formed of such a rubber gradually wears out its rubber portion as it is repeatedly used. Therefore, in the case of such a roller, it was necessary to replace it with a new one when the degree of its deterioration became large.

On the other hand, as a sheet feeding apparatus, there is a sheet feeding apparatus of a system called a front loading type in which a sheet feeding tray can be inserted and removed from the front of the apparatus main body. In such a front-loading type paper feeder, the paper feed roller is
A paper feed roller unit with a paper feed roller fixed to the roller shaft,
The paper feed roller is divided into a drive rotary shaft for transmitting a rotational force from a motor to the paper feed roller, and the drive rotary shaft is disposed on the inner side of the apparatus main body.

[0004] The divided portion has, for example, a configuration as shown in FIG. That is, the roller shaft 53 is divided into a paper feed roller portion 51 and a driving rotary shaft portion 52, and the rollers 54, 54 (see FIG. 14) of the paper feed roller portion 51 are fixed.
Is formed by a steel plate having a U-shaped cross section, and a U-shaped pin engaging hole 55 is formed on both side surfaces 53a and 53b at one end of the roller shaft 53 on the side of the drive rotating shaft portion 52, and each pin connection is formed. A notch 56 having a tapered shape with a wide entrance side is formed at the entrance of the hole 55. Further, the drive rotation shaft 52
Is formed of a solid shaft made of metal (for example, a steel bar) having an outer diameter that can be engaged within the U-shaped cross section of the roller shaft 53, and the tip portion thereof is a tapered tapered portion 52a. Then, a through-hole is formed in a portion other than the tapered portion 52a of the driving rotary shaft portion 52, and a rotation-regulating pin 57 is fixed therethrough by press-fitting.

In this paper feed roller, a driving rotary shaft 52 is attached to a fixed portion on the back side of the apparatus, and it is rotated by a rotary drive system. When connecting the paper feed roller unit 51, FIG.
As shown in FIG. 4, the pair of pin engagement holes 55 formed at the front end of the sheet feed roller 51 with the end opposite to the pin engagement hole 55 restricts the rotation of the drive rotary shaft 52. And insert them so that the pins 57 are inserted.

[0006]

However, the operation of inserting the pin engagement hole 55 of the paper feed roller portion 51 into the rotation regulating pin 57 of the drive rotary shaft portion 52 in this manner is performed, for example, in a normal copying machine. In this case, the length L of the feed roller unit 51
However, since it is formed to a length that allows the A4 size paper to be fed sideways and is long to some extent, even if it is attempted to hold it only by the end opposite to the pin engagement hole 55, a person who is not accustomed to it can use the pin 57. However, there is a problem that it is difficult to insert the pin engagement hole 55 into the hole.

In addition, the pin engagement hole 5
Ideally, in order to engage the pin 57 with the pin 5, the position of the eye should be positioned on the center axis Lc of the drive rotary shaft 52. Is fixed, so that it enters the field of view and the drive rotary shaft 52 becomes invisible, so that the line of sight is shifted from the center axis Lc to a position where the drive rotary shaft 52 is visible during actual work, or a solid line in FIG. As shown in the above, the paper feed roller 51 must be inserted so as to be obliquely shifted with respect to the center axis Lc. Accordingly, although the tapered notch 56 as shown in FIG. 13 is formed in the pin engagement hole 55, the operation of engaging the pin 57 there is a troublesome and troublesome operation. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and in a paper feed roller mechanism of a paper loading device of a front loading type, a paper feed roller can be easily replaced from the front of the device. The purpose is to do.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a paper feeding roller mechanism of a paper loading device of the above-described front loading type, wherein a paper feeding roller is accommodated in a paper feeding tray. The roller that feeds the paper from the paper feed tray by rotating while contacting the upper surface of the fed paper is fixed to the roller shaft, and the rotational force is transmitted to the paper feed roller on the back side of the main body. And a driving rotary shaft portion. A shaft portion is formed at one of one end of the drive rotation shaft portion and one end of the sheet feeding roller portion corresponding to the one end, and a shaft engagement hole for fitting the shaft portion so as to be engageable is formed at the other end. The shaft portion is formed into a tapered tapered shaft portion, and a tapered hole portion is formed at the entrance portion of the shaft engagement hole such that the diameter of the hole gradually decreases as the entrance becomes wider and deeper.

In this way, when the roller is worn, the paper feed roller can be easily separated from the drive rotary shaft by pulling out the paper feed roller from the drive rotary shaft. When a new paper feed roller is attached to the apparatus again, a tapered shaft is formed on one of the shaft of one end of the drive rotary shaft and one end of the paper feed roller. Is provided with a shaft engaging hole into which the shaft portion is fitted so as to be engageable with the tapered hole portion formed at the entrance portion thereof, so that they can be easily engaged with both tapered portions. .

Preferably, at least one of the one end of the drive rotary shaft and the one end of the paper feed roller on the drive rotary shaft side where the shaft and the shaft engaging hole are formed is made of resin.
By doing so, even a complicated shape can be easily manufactured by molding, so that the number of manufacturing steps can be reduced as compared with a case where a shaft-shaped steel material is manufactured by cutting, so that the cost can be reduced. Also, the weight can be reduced.

Further, two rotation regulating blades extending radially outward from the peripheral surface of the shaft at portions other than the tapered shaft portion of the shaft portion, and one projection for preventing erroneous assembly. The blades may be provided at intervals in the circumferential direction, and an engagement groove may be formed to fit the two rotation-controlling blades and one protruding blade into the shaft engagement holes. that way,
The two rotation regulating blades reliably prevent the paper feed roller from rotating relative to the drive rotary shaft. The paper feed roller is made up of a projection blade for preventing erroneous assembly and an engaging groove for fitting the same. The position of the shaft in the rotation direction with respect to the drive rotation shaft portion is reliably regulated, and erroneous assembly is prevented.

Therefore, when the mounting position of the roller in the rotating direction with respect to the roller shaft needs to be restricted in relation to the home position, such as when the roller is a half-moon-shaped roller, the roller is erroneously reversed. Even in the case of assembling, in this case, since the projection blade for preventing erroneous assembly does not fit into the engagement groove, erroneous assembly of the sheet feeding roller unit with respect to the drive rotary shaft can be reliably prevented.

Further, it is preferable that at least one end of the drive rotating shaft portion which engages with the sheet feeding roller portion has a fluorescent property. Then, when the leading end of the roller shaft of the paper feed roller unit is inserted into the drive rotary shaft unit and engaged therewith, even if the inside of the apparatus main body is dark, it engages with the target paper feed roller unit of the drive rotary shaft unit. The work is facilitated because the target is made clear by the fact that one end has a fluorescent property.

Further, the drive rotary shaft is formed integrally with a one-rotation clutch for transmitting a driving force to the drive rotary shaft into a unit, and the unit is detachably provided on the back of the apparatus body. It is preferable to be detachably attached to the rear side of a rear plate provided in the apparatus main body at a predetermined distance from the cover. In this way, when replacing the one-rotation clutch or the driving rotary shaft, if the rear cover is removed, they can be easily removed in a unit state from the rear side of the apparatus main body.

When the length of the roller shaft of the paper feed roller unit is set at a predetermined set position of the apparatus main body, the end of the paper feed roller unit on the side of the drive rotary shaft side becomes the device. A length that protrudes toward the rear cover beyond the paper feed roller part penetrating hole formed in the rear side plate provided in the apparatus main body at a predetermined distance from the rear cover detachably provided on the back of the main body. And the size of the two rotation regulating blades cannot be moved to the rear cover side beyond the hole formed in the rear side plate.

In this case, when replacing both the paper feed roller and the drive rotary shaft, the paper feed roller must be first removed from the front side of the apparatus, and then the drive rotary shaft is removed from the rear cover. Even if the drive shaft was removed from the back of the machine by mistake where it should be removed from the back of the machine, the roller shaft is retained in the hole for the feed roller on the rear plate. Being dropped no more.

Further, even if a force is applied to the roller shaft of the paper feed roller unit to pull it out toward the rear side of the apparatus body, the paper feed roller unit having two rotation regulating blades formed on the rear plate. Since the roller shaft is formed so that it cannot move to the rear cover side beyond the through hole, the roller shaft does not move further to the rear plate side. The holding is maintained and it can be prevented from falling off therefrom.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an engagement portion between a paper feed roller portion and a drive rotary shaft portion of a paper feed roller mechanism according to the present invention, FIG. 2 is a side view showing the same paper feed roller mechanism, and FIG. FIG. 2 is a schematic configuration diagram illustrating an example of a copying machine provided with a paper roller mechanism.

The paper feed roller mechanism 2 is provided, for example, in a paper feed device 20 of a copying machine as shown in FIG.
2 is suitable for application to a front-loading type paper feeder that draws out the paper 2. First, the configuration of the entire copying machine provided with the paper feed roller mechanism 2 will be briefly described with reference to FIG. In this copying machine, an openable and closable pressure plate 8 is provided on an upper portion of the apparatus main body 1, an in-body paper discharge tray 11 is provided above the apparatus main body 1, and an image forming section 10 is provided on a lower side thereof. I have. Further, on the lower side, two-stage paper feed trays 12, 12 which can be pulled out, respectively, are provided.

The image forming unit 10 is not directly related to the present invention, so a detailed description thereof will be omitted, but a photosensitive drum 13 rotating in the direction of arrow B is provided therein, and the image forming unit 10 is selected there. The paper P is fed from the paper feed tray 12 of the paper feed stage by the paper feed roller mechanism 2, and an image is formed on the upper surface of the paper P in FIG. Paper P on which the image is formed
The paper discharge direction is selectively divided by a branching section 14 provided on the downstream side of the paper transport of the fixing device 3, and the paper proceeds straight and is discharged to the straight paper discharge tray 16, or the internal discharge tray 1.
1 is discharged.

In FIG. 3, reference numeral 4 denotes a double-sided conveyance path, and when the upper sheet feeding tray 12 is pulled out and a separately prepared double-sided unit is inserted therein, the double-sided mode is selected. P on which an image is formed on one side by the image forming unit 10
Is received in the double-sided conveyance path 4 and sent to the double-sided unit. The paper feed roller mechanism 2 rotates the paper feed roller 5 while contacting the upper surface of the paper P stored in the paper feed tray 12 as shown in FIG.
A roller 6 in the form of a half-moon that feeds the paper P from the upper side, a paper feed roller unit 17 in which a paper presser 19 is fixed to a roller shaft 7, and the paper feed roller unit 17 And the drive rotary shaft 18 that transmits the rotational force.

Then, as shown in FIG.
7 is formed separately at one end of the roller shaft 7 and
, And the tip of the shaft portion 21 is a tapered tapered shaft portion 21a. Further, the drive rotation shaft 18
At one end thereof, corresponding to the shaft portion 21 of the paper feed roller portion 17,
A shaft engaging hole 22 into which the shaft portion 21 is engageably engaged is formed, and a tapered hole portion 22 having an entrance portion of the shaft engaging hole 22 whose diameter is gradually reduced as the entrance is wide and deep.
a (see also FIGS. 4 to 7).

Furthermore, two rotation regulating blades 23, which extend radially outward from the peripheral surface of the shaft with the same length, respectively, on the round shaft portion other than the tapered shaft portion 21a of the shaft portion 21,
23, and one protruding blade 24 having a shorter length than the blade 23 and protruding from the peripheral surface of the shaft for preventing erroneous assembly is provided at intervals in the circumferential direction as shown in FIGS. ing. Further, the two rotation regulating blades 23, 23 and one of the projection blades 24 for preventing erroneous assembly correspond to the shaft engaging hole 22 on the drive rotating shaft portion 18 side. Engagement grooves 25, 25 into which the control blades 23 are respectively fitted, and engagement grooves 26, into which one protruding blade 24 is fitted, are formed.

As described above, the shaft 21 of the paper feed roller 17
The tip of the drive rotary shaft 18 has a complicated shape. In this embodiment, the shaft 21 and the drive rotary shaft 1
Since each of the members 8 is formed by molding with resin, it can be easily manufactured. Therefore, the number of manufacturing steps can be reduced as compared with the case where the shaft-shaped steel is manufactured by cutting, so that it can be manufactured inexpensively and the weight can be reduced.

It is to be noted that the drive rotary shaft portion 18 can be manufactured at a low cost without forming the entirety of the resin as long as at least a portion having the shaft engaging hole 22 is formed of a resin. In addition, contrary to the above-described embodiment, the shaft portion 21 is formed on the drive rotating shaft portion 18 side, and two rotation regulating blades 23, 23 and one projection for preventing incorrect assembly are provided there. Blades 24 are formed, shaft engaging holes 22 are formed on the side of the paper feed roller portion 17 corresponding thereto, and engagement grooves 25, 25 for fitting rotation-controlling blades 23, 23 therein, respectively;
An engagement groove 26 into which the projection blade 24 is fitted may be formed.

As shown in FIG. 2, the drive rotation shaft 18 is
The drive unit 30 is formed integrally with a one-rotation clutch 31 that transmits a driving force to the drive rotation shaft portion 18. The drive unit 30 includes upper and lower two-stage paper feed trays 12, 1.
A drive rotary shaft 18 and a one-rotation clutch 31 for transmitting a rotational force to each of the two paper feed roller units 17 are provided. Further, in this copying machine, a rear cover 27 is detachably provided on the back surface of the apparatus main body 1, and a rear side plate 28 is provided in the apparatus main body 1 at a predetermined distance from the cover 27. 28 is removably attached to the back surface 28a side.

When the paper feed roller 5 is set on the apparatus main body 1, the shaft 21 of the paper feed roller 17 is engaged with the shaft engaging hole 22 formed on the drive rotary shaft 18 shown in FIG.
2, the two rotation regulating blades 23, 23 are engaged with the engaging grooves 25, 25, and one projecting blade 24 is engaged with the engaging groove 26 (FIG. 1). (See FIG. 2).

If the user tries to insert the shaft 21 into the shaft engaging hole 22 by erroneously turning the paper feed roller 17 upside down in FIG. Do not fit into the engaging groove 26, and therefore they cannot be assembled. Therefore, the operator immediately notices that the direction of the sheet feeding roller unit 17 is reversed. Therefore, when the roller 6 is a half-moon-shaped roller as shown in FIG. 10 as in the paper feeder of this embodiment, the roller 6 is provided with a linear notch surface 6a at the home position. As described above, the roller shaft 7 must be attached to the position facing the sheet surface Pa, but this can be surely performed.

As shown in FIG. 2, the shaft 21 of the sheet feed roller 17 (not shown in FIG. 2 and therefore see FIG. 1) is held in a proper posture and the shaft engaging hole on the side of the drive rotary shaft 18 is provided. In a state where the blade is inserted into the predetermined depth into the rotation groove 22, the two rotation regulating blades 23 are fitted into the engagement grooves 25, 25.
As a result, the relative rotation of the sheet supply roller unit 17 with respect to the drive rotation shaft unit 18 is reliably prevented. Therefore, the rotational force from the driving rotary shaft 18 is reliably transmitted to the paper feed roller 17.
To the roller shaft 7.

The feed roller 5 is inserted into the shaft engaging hole 22 of the drive rotary shaft 18 to a predetermined depth, and the shaft 21 of the roller shaft 7 is inserted.
The round shaft 36 fixed to the end on the opposite side of FIG.
As shown in (1), the inside of the front plate 34 of the apparatus main body 1 is formed into a shaft holding hole 34a having a larger inner diameter than the round shaft portion 36 and having a notch in a part. In this state, a shaft holding member 35 (see also FIG. 2) also serving as a bearing is fitted into the round shaft portion 36, a screw is inserted into a fixing hole 35a formed in the shaft holding member 35, and the screw is inserted into the hole 35a. It is screwed and fixed to the side plate 34.

In this copying machine, for example, when the paper feed roller 5 is replaced for maintenance or the like, the paper feed tray 12 of the paper feed stage to be replaced is replaced with the shaft holding member 35 described with reference to FIG. The screw is removed by loosening the screw from 34, and the round shaft portion 36 is lowered to be out of the notch of the shaft holding hole 34a. Then, the portion of the paper feed roller unit 17 to which the roller 6 shown in FIG. 2 is attached is pulled out to the front side of the apparatus main body 1 on the right side in FIG.

By doing so, the paper feed roller portion 17 can be easily separated from the drive rotary shaft portion 18. Then, a new paper feed roller unit 17 is attached to the apparatus again. At this time, the shaft engaging hole 22 at one end of the drive rotary shaft unit 18 is formed with a tapered hole portion 22a at the entrance as described with reference to FIG. Paper feed roller unit 1
Since the tapered shaft portion 21a is formed in the shaft portion 21 of 7, the engagement thereof can be easily performed by the tapered portions provided on both sides.

Incidentally, in this copying machine, a rear cover 27 is detachably provided on the back surface of the apparatus main body 1 as described with reference to FIG. Therefore, when replacing the paper feed roller 17 and the drive rotary shaft 18 together, first remove the paper feed roller 17 from the front surface of the apparatus main body 1, and then remove the drive rotary shaft 18 from the rear cover 27. The original removal method is to remove the drive rotary shaft 18 from the rear side of the apparatus main body 1 by mistake. Since the shaft 21 is disengaged from the drive rotary shaft 18, it may fall.

However, in this paper feed roller mechanism,
When the length of the roller shaft 7 of the paper feed roller unit 17 is set at a predetermined set position of the apparatus main body 1 as shown in FIG. Since the tip of the shaft portion 21 which is the end portion on the shaft portion 18 side is formed to have a length protruding toward the rear cover 27 beyond the paper feed roller portion penetrating hole 28b formed in the rear plate 28, the shaft is formed. Even if the drive rotary shaft 18 is disengaged from the portion 21, the roller shaft 7 may fall down because the shaft 21 is held in the hole 28b for the feed roller portion of the rear plate 28. Absent.

When the drive rotary shaft 18 (FIG. 2) is taken out from the rear side of the apparatus and disengaged from the shaft 21 of the sheet feeding roller section 17, the roller shaft 7 is moved to the rear side of the apparatus. (FIG. 12
When the roller shaft 7 moves to the left), the round shaft portion 36 at the end of the roller shaft 7 on the opposite side to the drive rotation shaft portion 18 is
5, the paper feed roller unit 17 may fall. However, in this paper feed roller mechanism, even if a force is applied to the roller shaft 7 to move the roller shaft 7 to the rear side of the apparatus main body 1, the two rotation regulating blades 23,
Since the size of the roller shaft 23 cannot be moved to the rear cover 27 beyond the hole 28b formed in the rear side plate 28, the movement of the roller shaft 7 to the rear of the apparatus is restricted, so that the roller shaft 7 The round shaft portion 36 does not fall off the shaft holding member 35.

When the paper feed roller unit 17 is to be replaced, the paper feed tray 1 of the corresponding paper feed stage must be replaced as described above.
2 is pulled out of the apparatus main body 1, but the interior of the apparatus main body 1 is still dark, so a new paper feed roller section 17 is inserted by aiming the shaft section 21 at the tip thereof into the shaft engaging hole 22 of the drive rotary shaft section 18. The work is hard to do. Therefore, the driving rotary shaft 18
If at least one end of the paper feed roller portion 17 which engages with the shaft portion 21 is made to have a fluorescent property by applying a fluorescent paint to the shaft portion 21, the shaft portion 21 can The workability is improved because the target becomes clear when the object is inserted into the engagement hole 22.

[0038]

As described above, according to the paper feed roller mechanism of the present invention, the tapered portions are provided at both the engagement portions of the one end of the drive rotating shaft and the one end of the paper feed roller. When replacing the paper feed roller for maintenance or the like, the replacement operation can be easily performed even from the front of the apparatus.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an engagement portion between a paper feed roller unit and a driving rotary shaft of a paper feed roller mechanism according to the present invention.

FIG. 2 is a side view showing the paper feed roller mechanism.

FIG. 3 is a schematic configuration diagram showing an example of a copier provided with the paper feed roller mechanism.

FIG. 4 is a front view showing a driving rotary shaft part constituting the paper feed roller mechanism of FIG. 1;

FIG. 5 is a left side view of the drive rotary shaft.

FIG. 6 is a sectional view taken along line CC of FIG. 5;

FIG. 7 is a sectional view taken along line DD of FIG. 5;

FIG. 8 is a plan view showing a shaft provided in the paper feed roller of FIG. 1;

FIG. 9 is a front view of the shaft.

FIG. 10 is a schematic diagram showing a state in which rollers of the paper feed roller mechanism of FIG. 2 are at a home position.

11 is a front view showing a state in which the sheet feeding roller unit of FIG. 1 is set at a predetermined position of the apparatus main body.

FIG. 12 is a plan view for explaining a state in which a sheet feeding roller unit does not drop even when a driving rotation shaft unit of FIG. 1 is removed.

FIG. 13 is a perspective view illustrating a configuration of a conventional paper feed roller mechanism that can be divided into a paper feed roller unit and a driving rotary shaft unit.

FIG. 14 is a schematic diagram for explaining a method of assembling a paper feed roller unit that can be divided from the conventional drive rotation shaft unit.

[Explanation of symbols]

 1: Apparatus main body 5: Paper feed roller 6: Roller 7: Roller shaft 12: Paper feed tray 17: Paper feed roller 18: Driving rotary shaft 21: Shaft 21a: Tapered shaft 22: Shaft engaging hole 22a: Tapered hole 23: Rotation control blade 24: Projection blade 25, 26: Engagement groove 27: Rear cover 28: Rear plate 30: Drive unit 31: 1 rotation clutch

Claims (6)

[Claims] 1. A paper feeding roller mechanism of a front loading type paper feeding device, comprising a paper feeding roller for feeding paper stored in a paper feeding tray, wherein the paper feeding tray can be inserted and removed from a front surface of an apparatus body. A paper feed roller unit having a roller shaft fixed to a roller shaft for rotating the paper feed roller while contacting the upper surface of the paper stored in the paper feed tray while feeding the paper from the paper feed tray; A drive roller shaft for transmitting a rotational force to the paper roller unit on the back side of the apparatus main body; and one end of the drive rotation shaft unit and one end of the paper feed roller unit corresponding to the one end. While forming the shaft,
On the other hand, a shaft engaging hole for fitting the shaft portion so as to be engageable is formed, and a tip end portion of the shaft portion is a tapered shaft portion, and an entrance is wide and deep in an entrance portion of the shaft engaging hole. A paper feed roller mechanism characterized by forming a tapered hole portion whose diameter gradually decreases as it goes. 2. An end of the drive rotary shaft and one end of the paper feed roller on the drive rotary shaft side where at least the shaft and the shaft engaging hole are formed are both made of resin. The paper feed roller mechanism according to claim 1, wherein 3. The paper feed roller mechanism according to claim 1, wherein two portions of the shaft portion other than the tapered shaft portion radially extend outward from a peripheral surface of the shaft. And one protruding blade for preventing erroneous assembly are provided at intervals in the circumferential direction, and the two rotation restricting blades and one protruding blade are fitted into the shaft engaging holes, respectively. A sheet feed roller mechanism, wherein an engagement groove for causing the sheet feed roller is formed. 4. The feeding device according to claim 1, wherein at least one end of said driving rotary shaft portion which engages with said sheet feeding roller portion has a fluorescent property. Paper roller mechanism. 5. The paper feed roller mechanism according to claim 1, wherein the drive rotary shaft is unitized with a one-rotation clutch that transmits a driving force to the drive rotary shaft. The unit is formed, and the unit is detachably attached to a rear surface of a rear side plate provided in the apparatus main body at a predetermined distance from a rear cover detachably provided on the rear surface of the apparatus main body. Paper feed roller mechanism. 6. The paper feed roller mechanism according to claim 3, wherein the length of the roller shaft of the paper feed roller is set when the paper feed roller is set at a predetermined set position of the apparatus main body. A feed roller unit formed on a rear plate provided in the apparatus main body at a predetermined distance from a rear cover in which an end of the roller unit on the drive rotation shaft side is detachably provided on a back surface of the apparatus main body. A size that is formed to a length protruding toward the rear cover beyond the hole for penetration, so that the two rotation regulating blades cannot move to the rear cover side beyond the hole formed in the rear side plate. A paper feed roller mechanism characterized in that: