JP2649991B2 - Discharge roller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge roller which is used in a recording apparatus such as a printer or a copying machine and discharges a processed sheet coming out of a fixing device or the like and stacks it on a stacker.

[0002]

2. Description of the Related Art FIG. 3 is a front view showing the structure of a conventional discharge roller. The discharge roller 1 is constructed by attaching a rubber roller 2 to a shaft 3, and a plurality of projections 4 are formed on the outer periphery of the end of the rubber roller 2. They are integrally formed at equal intervals in the circumferential direction.
The paper coming out of the fixing device or the like is discharged to the stacker by the discharge roller 1, and at the time of this discharge, the projection 4 plays a role of increasing the conveying force.

[0003]

By using the discharge roller having such a structure, the paper is completely discharged, but the rotating rubber roller and the cover portion of the apparatus (provided below the discharge roller). ), The trailing edge of the ejected paper was entangled, resulting in paper jam.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a discharge roller capable of preventing a trailing end of a discharged sheet from being caught between a rubber roller and a cover portion of the discharge roller and stably discharging the sheet. And

[0005]

FIG . 1 illustrates the principle of the present invention.
FIG. 2 is a diagram showing the problem of the present invention with reference to FIG.
The means for deciding will be described. Referring to FIG. 1, the present invention provides a rubber
Roller 12 is attached to the shaft 13 and the processed paper
Rollers that discharge the paper and stack it on the stacker
Larger than the rubber roller 12 at the center of the rubber roller 12.
It is made of a mysterious and harder material,
Characterized in that a spacer 15 lower than the protrusion 14 is provided.
You.

In FIG. 1, reference numeral 11 denotes a discharge row.
This discharge roller staps paper from a fixing device or the like.
The reference numeral 17 denotes a guide
It represents a C part.

[0007]

The paper coming out of the fixing device or the like is discharged from the discharge roller 11.
Is ejected to the stacker, and at the time of this ejection, the protrusions 14 protruding from the rubber roller 12 and the spacer 15 play a role of increasing the conveying force. At the time of this paper discharge, Gomuro
A substantially hollow circle formed by the outer periphery of the ra 12 and the projection 14
Part of the rear end of the paper that has been deformed by bending enters the cylindrical space.
As a result, there is a problem that the trailing edge of the paper is caught between the rubber roller and the cover of the apparatus.

However, in the present invention, the spacer 15 is provided at the center of the rubber roller 12, and since the spacer 15 has a larger diameter than the rubber roller 12,
Of a substantially hollow cylindrical shape constituted by the outer periphery of
Which narrowed the space and caused it to flex and deform
The entry of the trailing edge of the sheet is suppressed, and the sheet is prevented from being entangled.
Further, since the spacer 15 is lower than the protrusion 14, the paper is carried.
The projection 14 bears the feeding force, and the projection 14 is provided.
The end of the rubber roller 12 is shaped like a gear.
At the end, and between the projections 14
Paper is pressed by the protrusions 14
Although the entrainment force of the starting plate 14 is large, the spacer 15 is
It has a small entrainment force because it is cylindrical
The problem of entrapment by the pacer 15 does not occur.
In addition, since the spacer 15 is formed of a material harder than a rubber roller such as a resin or a metal, a stable operation can be performed for a long period of time.

An embodiment of the present invention will be described below with reference to FIG.

FIG. 2 is a view for explaining the structure and operation of the discharge roller of this embodiment. In the drawing, reference numeral 10 denotes a paper discharge unit of the recording apparatus. The paper discharge unit 10 includes a discharge roller 11 for discharging a sheet coming out of a fixing device (not shown), and a discharge roller 1.
1 is provided with a stacker 16 for stacking the sheets discharged by 1.

The discharge roller 11 has a plurality of rubber rollers 12 attached to the shaft 13 as described above, and each rubber roller 12 has a projection 14 and a spacer 15. The shaft 13 is driven and rotated by a drive system (not shown).

The paper 100 coming out of the fixing device is discharged to the stacker 16 by the discharge roller 11. At this discharge, the projections 14 protruding from the rubber roller 12 and the spacer 15 serve to increase the conveying force, and the paper 100 is discharged. Is transported reliably. Moreover, spacers 15 provided in the center portion of the rubber roller 12, Ru diameter der than rubber roller 12
Therefore, the outer periphery of the rubber roller 12 and the projection 14
It will narrow the substantially hollow cylindrical space that is formed,
This serves to prevent the rear end of the sheet bent and deformed toward the guide portion 17 from entering.

The rubber roller 12 provided with the projections 14
The shape of the end is gear-shaped,
The paper that has entered between the protrusion 14 and the protrusion 14
As a result, the protrusion 14 has a large winding force.
However, the spacer 15 is merely cylindrical.
Therefore, the winding force is small, and the
Does not occur , the paper 100 is reliably discharged onto the stacker 16 without being caught in the guide portion side as in the related art. In the present invention, the spacer 15 is formed of a material harder than the rubber roller 12 such as resin or metal.
Therefore , stable operation over a long period of time is possible.

[0014]

As described above, according to the present invention, a spacer having a diameter larger than that of the rubber roller and lower than the projection is provided at the center of the rubber roller, and the spacer impedes the conveying force of the projection. In order to prevent the trailing edge of the paper from being entangled, the paper can be reliably discharged and stacked on the stacker. Further, if the spacer is formed of a material harder than a rubber roller, such as a resin or a metal, a stable operation can be performed for a long time.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a diagram illustrating the configuration and operation of a discharge roller according to an embodiment of the present invention.

FIG. 3 is a front view showing a structure of a conventional discharge roller.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Discharge roller 12 Rubber roller 13 Shaft 14 Projection 15 Spacer 16 Stacker 17 Guide part

Claims (1)

(57) [Claims] 1. A discharge roller configured by attaching a rubber roller (12) integrally provided with a plurality of protrusions (14) on an outer periphery thereof to a shaft (13), and discharging processed paper and stacking the processed paper on a stacker. 12), the rubber roller (1)
2) Made of a larger diameter and harder material
It is, moreover the projection (14) from a lower spacer (15)
A discharge roller, comprising: