JPH05139565A - Automatic document feeding device - Google Patents

Abstract

PURPOSE:To eliminate generation of useless vibrations and noises due to colliding of fine irregularities on a belt surface with a stopper when a carrying belt advances. CONSTITUTION:Carrying capacity of a document by an appropriate frictional resistance between a carrying belt 1 and the document (P) is secured by forming a smooth surface of the carrying belt 1 in an automatic document feeding device for an advancing direction, and forming a hair line 2 having fine irregularities for the direction normal to the advancing direction, and at the same time, generation of vibrations and noises is eliminated by removing fine collision with a document stopper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic document feeder, and more particularly to an automatic document feeder which automatically conveys a document onto a contact glass of an image forming apparatus by a conveyor belt.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, a conveyor belt of an automatic document feeder is provided with a large number of minute irregularities (embosses) 2b on the surface of the conveyor belt 1 and the irregularities 2b of the conveyor belt 1 and the original document. By setting the frictional force between the contact glass 3 having the document stopper 4 and the document P to a sufficiently large frictional force with respect to the document P, a conveyance force for conveying the document P is provided.

[0003]

However, in the conventional automatic document feeder, as shown in FIG. 7, due to the fine unevenness (emboss) 2b formed on the surface of the conveyor belt 1, as shown in FIG.
Since the unevenness 2b repeatedly collides with the corner 4a of the document stopper 4, there is a problem that unnecessary vibration and noise are generated. The present invention aims to solve such problems.

[0004]

To achieve the above object, the present invention provides the following automatic document feeder.
That is, the present invention is an automatic document feeder having a transport belt for transporting a document on a contact glass, wherein the transport belt surface is smooth in the traveling direction and in the direction orthogonal to the traveling direction. An automatic document feeder, characterized in that a hairline having fine irregularities is formed.

[0005]

In the above construction, since the surface of the conveyor belt forms a smooth hairline in the traveling direction, collision does not occur with the stopper. In addition, the surface of the conveyor belt forms a hairline with fine irregularities in the direction perpendicular to the direction of travel to secure the conveying force by friction with the original and convey the original against the frictional force of the glass surface. To act like.

[0006]

Embodiments of the present invention will now be described with reference to the drawings, showing how the construction of the present invention is actually embodied, together with its operation.

FIG. 1 is an explanatory view of one embodiment of the present invention. In FIG. 1, reference numeral 1 denotes an endless rubber conveyor belt. Hairline 2 is formed. This conveyor belt 1
A contact glass 3 is located below the contact glass 3, and a document stopper 4 is fixed to one end of the contact glass 3, and a hairline 2 of the conveyor belt 1 is in light contact with a corner 4a of the document stopper 4. The transport belt 1 rotates in the traveling direction to transport the document P onto the contact glass 3 and then rotates in a slightly opposite direction so that the trailing edge of the document P moves to the stop surface 4b of the document stopper 4. The original P is correctly positioned at a predetermined position and stopped.

FIG. 2 shows A surrounded by the one-dot chain line in FIG.
It is a partial expanded perspective view of a part, and is a detailed explanatory view of the hairline 2. On the surface of the conveyor belt 1 in the figure, a plurality of hairlines 2 are arranged regularly along the traveling direction. That is, it is shown that the surface of the conveyor belt 1 is formed smoothly in the traveling direction, while innumerable fine irregularities are formed in the direction orthogonal to the traveling direction.

FIG. 3 is a partially enlarged side view of the portion B surrounded by the alternate long and short dash line in FIG. 1, in which the hairline 2 on the lower surface of the conveyor belt 1 is in contact with the corner 4a of the document stopper 4. Since the hairline 2 is formed smoothly in parallel with the traveling direction of the conveyor belt 1, a fine collision does not occur at the corner 4a of the document stopper 4 when the conveyor belt 1 rotates.

FIG. 4 is a plan view showing the appearance of the hairline of FIG. 1, and shows that innumerable hairlines 2 are regularly formed along the traveling direction of the conveyor belt 1.

FIG. 5 is a plan view showing another embodiment of the hairline of the present invention. The difference of the other embodiment from the one embodiment is that the one embodiment has a regular geometric line. On the other hand, the hair line 2a according to the other embodiment does not require such regular geometrical precision, but has a hairline along the traveling direction of the conveyor belt 1 as if it were a brush. In addition, a large number of slightly irregular herains 2a having a natural feel, like a trace swept with a broom are provided. Therefore, according to this other embodiment, the hairline 2a does not require any particular precision, which facilitates the manufacture. That is, the other embodiment characterized in that the hairline 2a is provided has the effect of preventing a minute collision with the document stopper 4 and suppressing the generation of vibration and noise, while the manufacturing cost of the conveyor belt is reduced. It is possible to have the effect of reducing
It is needless to say that the regular geometric hairline 2 of the above-mentioned one embodiment can drastically reduce vibration and noise more than the hairline 2a of the other embodiments.

As described above with reference to the embodiments, the present invention forms a hairline on the surface of a conveyor belt which is smooth in the traveling direction and has fine irregularities in the direction perpendicular to the traveling direction. Therefore, the conveyance belt does not collide with the corner of the document stopper while holding the conveyance force,
Therefore, it is possible to eliminate the possibility of generating minute vibrations and noise.

[0013]

As described above, according to the present invention, the surface of the conveyor belt is formed with a number of hairlines that are smooth in the traveling direction and have fine irregularities in the direction orthogonal to the traveling direction. It is possible to eliminate minute collisions with respect to the document stop, and suppress the generation of vibration and noise accompanying the operation of the apparatus. Further, since the conveyance belt is provided with a myriad of fine hairlines, there is an effect that the conveyance force can be secured by an appropriate frictional force between the conveyance belt and the document so that the document can be conveyed reliably.

[Brief description of drawings]

FIG. 1 is a perspective explanatory view of an embodiment of the present invention.

FIG. 2 is a partially enlarged perspective view of part A in FIG.

FIG. 3 is a partially enlarged side view of part B in FIG.

FIG. 4 is an explanatory plan view of an embodiment of the hairline of the present invention.

FIG. 5 is a plan view of another embodiment of the hairline of the present invention.

FIG. 6 is an explanatory diagram of a conventional example.

FIG. 7 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 1 Conveyor belt 2 Hairline 2a Hairline 3 Contact glass P Original

Claims (1)

[Claims] 1. An automatic document feeder having a conveyor belt for conveying an original on a contact glass, wherein the surface of the conveyor belt is smooth in the traveling direction and in the direction perpendicular to the traveling direction. An automatic document feeder, which is characterized in that a hairline having fine irregularities is formed.