JPH0729698B2 - Feeding roller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to a feeding roller for feeding a sheet material such as paper in a feeding device such as a copying machine or a printer.

<Prior Art> Conventional feed rollers used for conveying a sheet are roughly divided into, for example, a full-circle type and a half-moon type, and the full-circle type is a commonly used configuration. A high friction member is provided on the circumference, while the half-moon type has a part of the outer circumference cut out. The half-moon type is mainly used to feed the sheet materials loaded in the cassette one by one, and has the feature that it does not come into contact with the sheet materials except during feeding (when stopped or immediately after feeding is completed). .

Therefore, in both of these methods, a high friction member such as urethane rubber is arranged at the contact portion with the paper to improve the paper transportability. However, in terms of durability in continuous paper feeding, the high friction member is inevitable. It was necessary to replace the corners regularly to prevent the frictional force from decreasing due to abrasion, aging, paper dust, toner, etc. At that time, in the case of the full-circumference type, as shown in FIG. 7, the driving shaft 3 penetrates through the central portion of the core metal 2 which holds the circumferential high friction member 1, and the driving shaft 3 feeds. In many cases, the front side plate 4 and the rear side plate 5 of the paper apparatus main body are passed over and axially supported. Therefore, in order to replace the high friction member 1, it is necessary to remove the drive shaft 3 from the paper feeding apparatus main body. The replacement work had a drawback that it was very troublesome. Further, in the half-moon type, as shown in FIG. 8, the arc-shaped high friction member 6 is adhered to the core metal 7, and the core metal 7 is fixed to the drive shaft 8 with the screw 9. Even in such a case, when replacing the high friction member 6, it takes a very long time to remove each core metal 7 from the drive shaft 8 and attach the core metal 7 to which the new high friction member 6 is bonded to the drive shaft 8 with screws. Such a work is required, and the cored bar 7 is wasted every time the high friction member 6 is replaced, which is wasteful.

<Problems to be Solved by the Invention> The present invention completely eliminates the above-mentioned drawbacks of the conventional example, and at the same time, in the half-moon type, it was necessary to bond a high friction member to the cored bar part. The present invention makes it possible to attach the high friction member to the core by fitting the high friction member without the need for adhesion, thereby eliminating the need for good adhesion of the high friction member, and improving It is an object of the present invention to provide a completely new technology that enables the use of materials that could not be used in the past because of the friction but poor adhesion.

<Means for Solving Problems> A configuration according to the present invention for solving the above problems is provided in a sheet material feeding device and is driven in a feeding roller that feeds a sheet material by rotating. A cored bar portion fixed to the shaft and a high friction member attached to the cored bar portion for contacting and feeding the sheet material are provided, and the high friction member is continuously connected to form a closed space. The core metal part has an outer peripheral groove for attaching the high friction member, and the core metal part has an outer peripheral groove for mounting the high friction member. The high friction member has an inner circumferential groove formed from a side portion of the cored bar so as to be mounted so that the drive shaft is located outside a closed space formed by a friction member. The thickness of the part attached to the outer peripheral groove is thinner than the thickness of the part attached to the outer peripheral groove. It is characterized by the fact that it has been set.

<Operation> In the above configuration, the endless high friction member is fitted in the outer peripheral groove and the inner peripheral groove of the cored bar, so that the feeding roller can be easily configured and the fitted high friction member. The friction member is stable without shifting in the axial direction of the cored bar.

Further, since the high friction member has a thin inner peripheral groove portion of the core metal portion, the core metal can be easily fitted into the outer peripheral groove and the inner peripheral groove, and the high friction member is Optimal tension (the force with which the high-friction member contracts) can be obtained when it is fitted into the portion, and the adhesion between the high-friction member and the cored bar can be improved.

<Embodiment> Next, one embodiment of the roller according to the present invention will be described in detail with reference to the drawings. FIGS. 1 to 3 each show an embodiment of a full circumference type. FIG. 2 is a perspective view showing a drive shaft 11, a core metal 12 fixed to the drive shaft 11 by a screw a, and a high friction member 10 attached to the core metal 12, respectively, and FIGS. 2 (A), (B), (C). ), (D) are explanatory views of the main part showing a state in which the member 10 is attached to the cored bar 12, and FIG. 3 is an explanatory view showing the shape of the high friction member 10. As is apparent from the above figure, in the present invention, two flanges 13, 13 'are provided on the outer peripheral surface.
After forming a ring-shaped groove 17 between them and fixing a core metal 12 provided with a horseshoe-shaped groove 18 on the inner peripheral surface thereof to the drive shaft 11 with a screw, a horseshoe-shaped urethane rubber or the like is formed. A continuous belt-shaped high friction member 10 made of a material is press-fitted into the groove 17 on the outer peripheral surface and the groove 18 on the inner peripheral surface of the cored bar 12 so as to be wound around the cored bar 12 and fitted therein. Therefore, the high friction member 10 is prevented from shifting in the thrust direction due to the action of the flanges 13 and 13 '.

As shown in FIG. 3, the above-mentioned high friction member 10 has a groove of the core metal 12.
It is formed in a shape similar to the shape that can be accommodated in 17, 18, and the size when it is fitted into the core metal 12 is set to be small in advance. As a result, the high friction member 10 generates a force (tension) to shrink when it is fitted into the core metal 12, and the high friction member 10 causes the high friction member 10 to contract.
Is held in close contact with.

However, the above-mentioned tension changes due to variations in the dimensional accuracy of the cored bar 12, and the larger the wall thickness of the high friction member 10, the larger the amount of change in tension. At this time, if the tension is small, the high-friction member 10 and the cored bar 12 are likely to be displaced, and if this displacement occurs, feeding failure of the sheet material or the like occurs. Further, when the tension is large, the workability at the time of attaching the high friction member 10 to the core metal 12 is deteriorated, and further, the high friction member 10 is attached to the core metal 12 in a state where the elastic force is reduced. It is easily worn. The amount of change in tension due to variations in the dimensional accuracy of the cored bar 12 can be stabilized by reducing the wall thickness of the high friction member 10, but the contact portion of the high friction member 10 with the paper against wear. A certain thickness is required in terms of durability and the like.

Therefore, in the high-friction member 10 of the present invention, the thickness of the portion that comes into contact with the paper is set to be thick, and the thickness of the portion that enters the center of the cored bar 12 is set to be thin so that the thickness varies partially. . That is,
The high-friction member 10 is configured such that the high-friction member 10 has a thickness smaller than that of a portion attached to the outer peripheral groove 17 formed in the core metal 12 and smaller than that of a portion attached to the inner peripheral groove 18. Optimal tension when fitted into 12 (high friction material
10 is the force to shrink). This allows
Adhesion between the high friction member 10 and the core 12 can be improved.

Next, FIGS. 4 to 6 each show a half-moon type embodiment, and FIG. 4 is a perspective view showing a half-moon shaped core metal 15,
5 (A), (B), and (C) are explanatory views showing the half-moon-shaped high friction member 14 and the cored bar 15, respectively, and FIG.
It is explanatory drawing which shows the state which attached. As is apparent from the above figure, the groove 20 is provided on the outer peripheral surface of the half-moon shaped core metal 15 in this embodiment by two half-moon shaped flanges 19 and 19 ', and the member 14 is formed on the inner peripheral surface thereof. Is formed with a groove 21 into which the lower part thereof can be fitted, and the cored bar 15 is fixed to the drive shaft 11 via a screw a. Therefore, the half-moon-shaped member 14 is configured such that the outer peripheral surface thereof is fitted into the groove 20 and the lower portion thereof is pressed into the groove 21 so as to be wound around the cored bar 15. Further, particularly in the case of the half-moon type, a small roller 16 is provided for coming into contact with the first fed sheet of paper and pushing down the sheet.

The above embodiment is a description of a drive shaft rotating type, but the present invention is not limited to this type, and the same applies to a type in which the drive shaft holding the core bar moves in parallel. Of course, it can be applied. Further, the feeding roller according to the present invention can be applied to either a roller for separating a sheet material from a load or a roller for conveying the separated sheet material, but the present invention is not limited to these rollers. Also, it goes without saying that they may be assembled by using a releasable adhesive.

<Effects of the Invention> As described above, in the present invention, the high friction member of the feeding roller is configured to be fitted into the outer peripheral groove and the inner peripheral groove of the cored bar portion. Therefore, the high friction member is displaced in the axial direction. In addition, it is not necessary to remove the cored bar portion or the drive shaft as in the conventional case when replacing the high friction member due to a reduction in frictional force, and only the high friction member can be easily replaced by a simple operation. Therefore, the conveyance of the sheet material is stable and
There is no waste because it can be used any number of times without throwing away the cored bar and the like as in the past.

In addition, since the high friction member is set so that the thickness of the portion attached to the inner peripheral portion is set to be smaller than the thickness of the portion attached to the outer peripheral groove of the core metal portion, the high friction member can be fitted into the core metal portion. To obtain the optimum tension (the force of contraction of the high-friction member) when the high-friction member is fitted into the cored bar, and to improve the adhesion between the high-friction member and the cored bar. Can be done.

[Brief description of drawings]

FIG. 1 is a perspective view showing components of this embodiment, FIG. 2 (A) is a sectional view of a roller, (B) is a left side view thereof,
(C) is a front view thereof, (D) is a right side view thereof, FIG. 3 is an explanatory view showing an embodiment of a high friction member, FIG. 4 is a perspective view showing a cored bar of another example, and FIG. (A) is a side view of the member, (B) is a front view of the core bar, (C) is a right side view thereof, FIG. 6 is a side view of a roller of another example, and FIGS. 7 and 8 are conventional examples, respectively. It is explanatory drawing which shows the roller. 1,6,10,14 are high friction members, 2,7,12,15 are core metals, 3,
8, 11 are drive shafts, 13, 13 ', 19, 19' are flanges, 16 are rollers, and 17, 18, 20, 21 are grooves.

Claims (1)

[Claims] 1. A feeding roller which is provided in a sheet feeding device and which feeds a sheet material by rotating, a core metal portion fixed to a drive shaft, and a sheet material attached to the core metal portion. A high-friction member for contacting and feeding the high-friction member, and forming the endless shape so as to continuously connect the high-friction member to form a closed space, An outer peripheral groove for mounting a friction member is provided, and for mounting the high friction member on the inner peripheral surface of the core metal part so that the drive shaft is located outside a closed space formed by the high friction member. The inner peripheral groove formed from the side portion of the core bar portion, the high-friction member, the thickness of the portion attached to the inner peripheral groove is thinner than the thickness of the portion attached to the outer peripheral groove A feeding roller characterized by being set.