JP2001348134A - Paper carrier device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set appropriate kickout characteristics and to ensure the carrying of paper sheets in the carrying direction without issuing any abnormal sound such as a sliding sound (abrasion sound) even if installing a kickout roller. SOLUTION: Interlocking rollers 20 are provided in the both ends of a carrier roller 9, and the tips of arms 11a of the kickout roller 11 are abutted on the outer circumference of the interlocking rollers 20 to interloekingly rotate the kickout roller 11 and the interlocking rollers 20 so that the rotating arms 11a of the kickout roller 11 are prevented from sliding relative to the outer circumference of the interlocking rollers 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper transport device for transporting a document or recording paper to a predetermined position, such as a facsimile machine or a copying machine, and more particularly, to a paper transport device for kicking out paper in a transport direction. The present invention relates to a sheet transport device.

[0002]

2. Description of the Related Art FIG. 4 is a diagram showing the overall construction of a conventional automatic document feeder, wherein 1 is a pickup roller installed on a document set table, 2 is a pressing plate for pressing a document against the pickup roller 1, and 3 and 4 Is a separation roller and a feed roller for separating and transporting the document one by one, 5 is a reading roller pair, 6 is a document reading sensor, 7 is a contact glass, 8 is a document pressing plate for pressing the document against the contact glass 7, 9 is a transport roller, 1
Reference numeral 0 denotes a pressure roller that presses against the transport roller 9, and reference numeral 11 denotes a kick roller provided coaxially with the pressure roller 10.

[0005] As shown in FIG. 5, a pressure roller 10 is longer than a transport roller 9, and is provided with a kick-out roller 11 having a plurality of elastic arms 11 a provided at both ends around the periphery thereof. The arm 11a has a length protruding from the outer periphery of the pressure roller 10, and the transport roller 9 and the pressure roller 10 rotate together. Usually, the transport roller 9 is formed of an elastic material such as rubber, and the pressure roller 10 is formed of a rigid body such as a synthetic resin.

In the automatic document feeder shown in FIGS. 4 and 5,
The set document is fed to the nip between the separation roller 3 and the feed roller 4 by the rotation of the pickup roller 1, and the documents are separated and conveyed one by one at the nip portion and sent to the reading roller pair 5. Then, the reading roller pair 5
Sends a document to a reading position of the document reading sensor 6 on the contact glass 7 at a predetermined speed.

[0005] The read original is discharged to the outside by a conveying roller 9 and a pressure roller 10 as shown in FIG. At the time of this discharge, the arm 11a of the ejection roller 11
In the discharge direction, so that the rear end of the document D is reliably discharged from the nip N between the transport roller 9 and the pressure roller 10.

[0006]

In the conventional document feeder provided with the conventional kick-out roller 11, as shown in FIG. 7, when the feed roller 9 and the pressure roller 10 are observed from the longitudinal direction, D passes through the nip N between the conveying roller 9 and the pressure roller 10 at the center, but the arms 11a of the ejection rollers 11 push up the document D on both sides, and the document D is sheared at this position. You will receive power. Even if this shearing force is applied, there is no problem if the paper is stiff (thick paper, etc.), but it is susceptible to weak paper (thin paper, etc.), causing a jam or fluttering of the document. .

For this reason, conventionally, as shown in FIG. 8, a transport guide plate 15 is extended at a position where the transport roller 9 and the pressure roller 10 are installed, and the transport guide plate 15 is
This problem has been addressed by abutting the tip of one arm 11a to prevent the ejection roller 11 from pushing up the original, or by reducing the diameter of the ejection roller 11.

However, the provision of the transport guide plate 15 means that the arm 11a of the rotating kick-out roller 11 slides with respect to the transport guide plate 15 because the transport guide plate 15 is fixed. There is a problem that a sliding noise (frictional sound) is generated, and a reduction in the diameter of the ejection roller 11 causes a decrease in ejection performance.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned conventional problems and to set an appropriate kicking characteristic without generating abnormal noise such as sliding noise (frictional sound) even when a kicking roller is installed. It is an object of the present invention to provide a sheet transport device capable of reliably transporting a sheet in a transport direction.

[0010]

According to a first aspect of the present invention, a sheet is conveyed by a conveying roller and a pressing roller pressed against the conveying roller so as to sandwich the sheet. In a paper transport apparatus provided with a kick roller provided coaxially with a pressure roller to kick a sheet in a transport direction, a diameter of the kick roller is made larger than a diameter of the pressure roller, and the roller is pressed against the kick roller. The transport roller is provided with a continuous roller that rotates together with the transport roller. With this configuration, a continuous roller that rotates together with the kick roller is provided at a portion where the kick roller presses against and kicks out the sheet. In addition, there is no portion that slides with the kick roller as in the related art, and no abnormal noise such as sliding noise (friction noise) is generated. Further, by appropriately changing the diameter and the like of the continuous roller, the setting of the ejection characteristic becomes easy.

According to a second aspect of the present invention, in the paper transport apparatus according to the first aspect, the ejection roller is formed of an elastic material, and the continuous roller is formed of a rigid body.
With this configuration, the paper can be reliably kicked out by installing the kicking roller so as to bite into the continuous roller.

According to a third aspect of the present invention, in the paper transporting apparatus according to the first or second aspect, the ejection roller has a configuration in which a plurality of elastic arms are protruded around the periphery. With this configuration, kicking out of the sheet is performed effectively.

According to a fourth aspect of the present invention, in the paper transporting apparatus according to the first or second aspect, the diameter of the continuous roller is smaller than the diameter of the transporting roller. It is possible to prevent problems such as bending and wrinkling.

According to a fifth aspect of the present invention, in the paper transporting apparatus of the first, second or third aspect, the continuous roller is formed integrally with the transporting roller. Then, cost reduction becomes possible.

According to a sixth aspect of the present invention, in the paper transport apparatus according to the fifth aspect, the central portion of the transport roller is a portion that is in pressure contact with the pressure roller, and both end portions are continuous roller portions. And

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. 4 to 8.
The members corresponding to those described in (1) are denoted by the same reference numerals, and detailed description is omitted.

FIG. 1 is an overall configuration diagram of an automatic document feeder for explaining an embodiment of the present invention, FIG. 2 is a perspective view of a main part in this embodiment, and FIG. 3 is a side view of a main part shown in FIG. The pressure roller 10 is longer than the transport roller 9 and is provided with a kick-out roller 11 provided with a plurality of elastic arms 11a around both ends thereof. The arm 11a is a pressure roller. The transport roller 9 and the pressure roller 10 rotate along with each other. Transport roller 9
Is formed of an elastic material such as rubber, and the pressure roller 10 is formed of a rigid body such as a synthetic resin.

A continuous roller 20 made of a rigid body is provided at both ends of the transport roller 9.
The tip of 1 a abuts on the outer periphery of the continuous roller 20, so that the ejection roller 11 and the continuous roller 20 can rotate together, and the arm 11 a of the rotating kick roller 11 contacts the outer periphery of the continuous roller 20. It is configured so as not to slide with respect to.

Therefore, since the ejection roller 11 and the continuous rotation roller 20 do not slide, there is no occurrence of abnormal noise due to sliding and friction as in the conventional case. Further, since it is easy to change the outer diameter of the ejection roller 11, the setting can be changed so as to improve the ejection performance by appropriately setting the shape of the ejection portion.

Further, if the diameter of the continuous roller 20 which is a rigid body is larger than the diameter of the transport roller 9 and becomes convex, side effects such as buckling of the transported paper and wrinkling of the paper are concerned. Further, since the transport roller 9 is formed of an elastic material and is worn over time,
If the diameter of the continuous roller 20 is the same as the diameter of the transport roller 9, the diameter of the continuous roller 20 may be larger than the diameter of the transport roller 9 when used for a long time. Should be smaller than the diameter.

The continuous roller 20 is installed by extending the conveying roller 9 to a position where the conveying roller 9 comes into contact with the tip of the arm portion 11a of the kicking roller 11, and contacting the pressing roller 10 at the center of the conveying roller 9. It is conceivable to adopt a stepped structure in which the diameter of the transfer roller 9 is small, and the portions (both ends) of the transport roller 9 that come into contact with the leading end of the ejection roller 11 have a small diameter. That is, the transport roller 9 and the continuous roller 20
By integrally forming the two roller structures, the structure can be simplified and the cost can be reduced.

[0022]

As described above, according to the paper conveying apparatus of the present invention, a continuous roller is provided at the portion where the kick roller comes into pressure contact to kick out the paper, and the continuous roller is rotated together with the kick roller. Since such a portion that slides with the kick roller can be eliminated, generation of abnormal noise such as sliding noise (friction noise) can be prevented. Further, it is easy to change the diameter and the like of the continuous roller, which is a paper ejection portion of the ejection roller, and it is possible to improve ejection characteristics.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an automatic document feeder for describing an embodiment of the present invention.

FIG. 2 is a perspective view of a main part in the embodiment of the present invention.

FIG. 3 is a side view of a main part according to the embodiment of the present invention.

FIG. 4 is an overall configuration diagram of a conventional automatic document feeder.

FIG. 5 is a perspective view showing a kick-out roller portion in the conventional device of FIG. 4;

FIG. 6 is an explanatory diagram of a document discharge state in the conventional apparatus of FIG. 4;

FIG. 7 is an explanatory diagram of a document discharge state of the conventional apparatus of FIG. 4 as viewed from a roller longitudinal direction.

FIG. 8 is an explanatory diagram of a configuration for solving a problem when using a conventional kick-out roller.

[Description of Signs] 9 Conveyance Roller 10 Pressure Roller 11 Kick-Out Roller 11a Arm 20 Continuous Roller

Claims (6)

[Claims] A transport roller and a pressure roller that presses against the transport roller to transport the sheet so as to sandwich the sheet, and further includes a kick roller that is provided coaxially with the pressure roller and kicks the sheet in the transport direction. Wherein the diameter of the kick roller is larger than the diameter of the pressure roller, and a continuous roller is provided on the transfer roller for pressing and rotating with the kick roller. Transport device. 2. The ejection roller is formed of an elastic material,
2. The sheet conveying device according to claim 1, wherein the continuous roller is formed of a rigid body. 3. The sheet conveying device according to claim 1, wherein the kick roller has a configuration in which a plurality of elastic arm portions protrude around the periphery. 4. The apparatus according to claim 1, wherein a diameter of the continuous roller is smaller than a diameter of the transport roller.
Paper transport device according to the above. 5. The paper transport apparatus according to claim 1, wherein said continuous roller is formed integrally with said transport roller. 6. The sheet conveying device according to claim 5, wherein a center portion of the conveying roller is a portion that is in pressure contact with the pressure roller, and both end portions are continuous roller portions.