JPH03205249A - Paper feeding mechanism for roll paper - Google Patents

Abstract

PURPOSE:To prevent the fall of a flange inserted in both the sides of a roll paper core and prevent the generation of squeak noise by reducing the inside diameter of the core insertion part of a flange smaller than the core inside diameter and installing a rib at a height for pressing the core inside diameter along the insertion direction on the outer periphery of the core insertion part. CONSTITUTION:A flange 1 is inserted to both sides of a roll paper core 4, and the shaft part which projects in the outward direction of the core 4 is set on a frictional member 5 in the bearing part of the device body, and a static force of a certain degree is applied on a roller paper 3 by the frictional resistance with the shaft part. A plurality of ribs 2 formed in the core insertion part of the flange 1 are installed at the height for pressing the inner wall of the core 4 along the outer periphery of the core insertion part, and the distance from the contact part with the inner wall of the core 4 to the center of the rotary shaft of the flange 1 is made uniform. Accordingly, the rib 2 can be pressed uniformly onto the inside wall of the core 4, and the flange 1 is fixed onto the roll paper free from inclination to the core 4, and the fall of the flange 1 is prevented, and the generation of squeak noise is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a paper feeding mechanism for feeding roll paper in an image forming apparatus using roll paper.

(B) Conventional technology Conventionally, in facsimile machines and image forming devices that use roll paper as the paper feed, as shown in Fig. 3, various methods have been used to rotatably support and feed the roll paper. There is.
For example, as shown in Fig. 4, flanges 1 are inserted into both sides of the roll paper core 4, and the shaft parts of the flanges that protrude outward on both sides of the core are set in the bearing part of the main body of the apparatus, so that the roll paper core 4 can be freely rotated. There is a method in which a predetermined amount of the rolled paper 2 is fed to the image forming section 9 by conveying the leading end of the rolled paper by a rotationally driven roller 8.

Here, the flange that is fixed and integrated with the roll paper is
By arranging the friction member 5 on the bearing part of the main body of the device that is in contact with the shaft part 10 protruding outward from the core, it applies an appropriate load to the main body of the roll paper when the leading edge of the roll paper is fed. Prevent unnecessary sagging.

(c) Problems to be solved by the invention By the way, in such a conventional paper feeding mechanism, the fourth
As shown in the figure, if the outer diameter of the core insertion part of the flange is smaller than the inner diameter of the roll paper core, the flange inserted into the core will fall inward due to the weight of the roll paper, placing an unnecessary load on the motor. This may cause overflow or paper feeding failure.

In addition, the insertion portion rubs against the inner wall of the core due to the fall of the flange, which may cause noise. On the other hand, if the outer diameter of the insertion portion of the flange is approximately the same as the inner diameter of the roll paper core, a large force is required to insert and remove the flange into and from the roll paper core, making it very difficult to insert and remove the flange.

This invention was made in consideration of these circumstances, and it is possible to feed roll paper by making it easy to insert and remove the flange, while preventing unnecessary load and noise caused by the flange falling down. It provides a mechanism.

(2) Means for solving the problem In a paper feeding mechanism that inserts flanges for holding roll paper into both sides of the core of the roll paper and feeds a predetermined amount of paper from the roll paper to the image forming section, the core of the flange A paper feeding mechanism characterized in that the outer diameter of the insertion part is smaller than the inner diameter of the core, and a plurality of ribs are provided on the outer periphery of the core insertion part with a height that presses the inner wall of the core along the flange insertion direction. It is.

(E) A rib that can evenly press the inner wall of the core outward with an appropriate force in the same direction as the insertion direction of the working flange, that is, a rib that can press the inner wall of the core outward with an appropriate force, that is, a rib that extends from the center of the rotation axis of the flange to the part of the lip that presses the inner wall of the core. By providing ribs with uniform distances on the core insertion part of the flange, the flanges inserted on both sides of the roll paper core can be prevented from falling inward due to the weight of the roll paper body, as shown in Figure 4. It can be prevented. This eliminates abnormal noise and rubbing noise caused by the insertion portion of the flange rubbing against the inner wall of the core, and also eliminates abnormal loads on the motor and the like. Furthermore, since the ribs reduce the contact area with the inner wall of the core, the flange can be easily inserted and removed without requiring much force.

(f) Example Hereinafter, one example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an explanation of the structure of this invention, in which 1 is a flange, 2 is a rib formed in the core insertion part of the flange, 3 is a roll of paper,
4 is a roll paper core, 5 is a friction member disposed on a bearing portion of the device main body, and 6 is the device main body.

The flanges 1 are inserted into both sides of the roll paper core, and the shaft parts projecting outward from the core are set in bearing parts of the main body of the apparatus and rotatably hold the roll paper. Here, the rib 2 formed in the core insertion portion of the flange is shaped so that the distance 7 from the portion in contact with the inner wall of the core to the center of the rotation axis of the flange is uniform. Therefore, the rib can evenly press the inner wall of the core outward with an appropriate force, and the flange is fixed to the roll paper without tilting within the core.

Compared to a flange having a core insertion portion having the same diameter as the score inner diameter, it can be easily inserted and removed because the area in contact with the inner wall of the core is smaller. FIG. 2 shows a perspective view and a front view of the flange 1 in FIG. 1.

The tip of the set roll paper is conveyed by a rotating roller to feed a predetermined amount of paper to an image forming section. At this time, the friction member 5 applies a certain amount of static force to the roll paper by frictional resistance with the shaft portion of the flange. This moderate load prevents the roll paper from becoming unnecessarily slack and also prevents slanted paper feeding. (G) Effects of the Invention From this invention, by forming a rib in the core insertion part of the flange with an equal distance 7 from the center of the rotation axis of the flange to contact with the inner wall of the core, the flange can prevent the rolled paper from falling inside the core. Fixed. Therefore, it is possible to prevent abnormal noises such as rubbing noises caused by rubbing between the inner wall of the core and the flange insertion portion, and also to eliminate abnormal loads on the motor and the like.

Furthermore, since the contact area with the inner wall of the core is smaller than that of a conventional flange that has a core insertion portion that is approximately the same size as the core inner diameter, the flange can be easily inserted and removed without requiring much force.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the structure of an embodiment of the present invention;
FIG. 2 is a perspective view and a front view of the flange 1 in FIG. 1,
FIG. 3 is a sectional view of a conventional facsimile machine, and FIG. 4 is an embodiment using a conventional flange. 1...flange, 2...rib, 3...roll paper,
4-roll core, 5...Friction member, 6...Image forming device main body, 7...Distance from the center of the rotation axis of the flange to the part of the rib that presses the inner wall of the core.

Claims (1)

[Claims] In a paper feeding mechanism that inserts flanges for holding the roll paper into both sides of the roll paper core and feeds a predetermined amount of paper from the roll paper to the image forming unit, the outer diameter of the core insertion part of the flange is smaller than the inner diameter of the core. A roll paper feeding mechanism characterized in that it is small and that a plurality of ribs are provided on the outer periphery of the core insertion portion with a height that presses the inner diameter of the core along the flange insertion direction.