JPH10329969A - Conveying mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conveying device, by which a plane type medium can be conveyed while dust and chips on its surface are removed, at a low cost without any increase in a size of the device. SOLUTION: This device is provided with a roller 2 conveying a plane type medium, and the roller 2 is provided with a spiral groove 9 arranged on the surface, which is brought into contact with the medium when the roller 2 is arranged on the medium to be conveyed. The spiral groove 9, whose spiral direction is inverted in the central part in the roller shaft direction, is formed so that it is tilted downward to the left in the left side from the central part in the roller shaft direction while it is tilted downward to the right side in the right side from the central part, in the front view from the conveying direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transport mechanism having a roller for transporting a flat medium such as a document or a recording sheet, and more particularly to a transport mechanism having a mechanism for removing dust adhering to the surface of a medium. .

[0002]

2. Description of the Related Art Conventionally, a facsimile machine, a printer or a copying machine has a transport mechanism for transporting a document to a reading section and a transport mechanism for transporting recording paper to a recording section or a printing section. Such a transport mechanism generally transports paper such as an original and recording paper by rollers, and includes a removing unit for removing dust adhered to the paper so that dust does not adhere to the paper in the reading unit or the printing unit. There are things. As a typical example of such a removing unit, there is a brush removing mechanism that comes into contact with the paper surface, and there is a device that removes dust and paper shavings attached to the surface by a brush.

As another removing means, there is a cleaner roller. The cleaner roller contacts the surface of the sheet to be conveyed and removes dust attached to the surface of the sheet.

Further, as another removing means, there is an electrostatic removing device which adsorbs dust by static electricity.

[0005]

In the conventional removing means, a brush removing mechanism for removing dust adhering to the paper by a brush generates static electricity due to friction between the brush and the paper being conveyed, and the surrounding dust becomes static electricity. However, there is a disadvantage that the toner adheres to the medium again. In order to prevent such a drawback, it is conceivable to use a conductive brush, but the brush becomes expensive.

Further, when a cleaner roller and a static eliminator are used, they must be provided in the transfer device, so that the transfer mechanism becomes large and expensive.
Not economic.

Further, when a brush or cleaner roller is used, it is necessary to replace or clean the brush or cleaner roller when the removed dust is accumulated.
It was troublesome.

SUMMARY OF THE INVENTION An object of the present invention is to provide a transporting apparatus which can transport a flat medium such as a manuscript or recording paper while removing dust and shavings at a low cost without increasing the size of the apparatus.

Another object of the present invention is to provide a conveying apparatus which does not require cleaning of a component for removing dust.

[0010]

SUMMARY OF THE INVENTION A transport mechanism according to the present invention includes a roller for transporting a planar medium, the roller being disposed on a medium to be transported and having a spiral groove on a surface in contact with the medium. Having.

In order to remove dust on the medium at the left and right ends of the roller, the spiral groove is formed by reversing the spiral winding at a predetermined position in the roller axis direction. When the helical groove is viewed from the front, the spiral groove is formed so as to be lower left from the predetermined position and lower right from the predetermined position.

In order to remove dust most effectively from the surface of the medium, the spiral groove is formed such that the spiral is wound around the center in the axial direction of the roller, and the roller is moved from the transport direction. When viewed from the front, the spiral groove is preferably formed so as to be lower left on the left side from the center in the roller axis direction, and to be lower right on the right side from the center.

[0013]

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the transport mechanism of the present invention. In the drawing, a roller pair of a driving roller 2 and a driven roller 3 and a pair of a reading device 1 and a platen roller 4 are arranged in the conveying direction of the document 1. The drive roller 2 and the reading device 5 are arranged on the reading surface side of the document 1.

The document 1 is guided by a pair of conveyance guides 6 and conveyed to a nip portion between the driving roller 2 and the driven roller 3. The rotation of the driving roller 2 and the driven roller 3 causes the document 1 to be paired. The document is conveyed to the reading device 5 via the conveyance guide 7. The reading device 5 includes a platen roller 4
The information written on the original 1 is read while being depressed by the controller 1 to generate a read signal.

The driving roller 2 is rotated by a driving force from a motor (not shown). A spiral groove 9 is formed on the surface of the driving roller 9. The spiral groove 9 is formed so as to be divided into right and left from the center (point A) in the axial direction of the drive roller. That is, the spiral winding of the spiral groove 9 is reversed with respect to the center point A. The winding is left-handed from the center point A to the left and right-handed from the center point A to the right. When the drive roller 2 is viewed from the front in the transport direction, the spiral groove 9
Is formed so that the left side from the center point A becomes lower left and the right side from the center point A becomes lower right.

Next, an operation of removing dust by the driving roller 2 will be described with reference to FIGS. FIG. 2 (a),
3B and FIGS. 3A and 3B show the drive roller 2 and the driven roller 3 shown in FIG. 1 in an enlarged manner at the left end when viewed from the transport direction.

As shown in FIG. 2A, it is assumed that the dust 11 is on the left side of the center point A of the driving roller 2 when viewed from the direction in which the original 1 is conveyed. The dust 11 is picked up by the rotation of the drive roller 2 in the spiral groove 9 on the left side of the center point A in FIG. 1 as shown in FIG. With the rotation of the driving roller 2,
The dust 11 is lifted upward while remaining inside the spiral groove 9 as shown in FIG. The dust 11 lifted upward moves to the left end while falling to the lower left along the spiral due to gravity, and finally reaches the spiral groove 9 as shown in FIG.
Falls to the end of the driving roller from the gap at the left end.

When the dust 11 is on the right side of the center point A of the driving roller 2 when viewed from the direction of transport of the original 1,
The dust 11 is picked up in the spiral groove 9 on the right side of the center point A by the rotation of the drive roller 2. With the rotation of the driving roller 2,
The dust 11 is lifted up while being inside the spiral groove 9. The garbage 11 lifted upwards moves down the right along the spiral due to gravity, and finally moves into the spiral groove 9.
Falls to the end of the drive roller from the gap at the right end.

As described above, only by providing a groove in the drive roller 2, dust adhering to the document and shavings of the document can be removed, so that the number of components of the transport mechanism does not increase.
The size can be reduced.

Thus, it is possible to prevent the dust on the document from adhering to the reading device and causing a reading error.

The embodiment of the present invention is not limited to the embodiment described above. For example, the drive roller 2 having the spiral groove 9 may be a roller that conveys a recording sheet to a recording unit or a printing unit.

The position where the spiral groove 9 is wound in the opposite direction is the center point A of the drive roller 2 as shown in FIG. It may be on the right or left side. Thus, dust can be removed from the left and right ends of the drive roller 2.

In the extreme, there is no position where the winding is reversed,
It may be simply a spiral in one direction. In this case, dust can be eliminated only in one direction. For example, in FIG.
When the spiral is wound leftward (downward to the right) when the drive roller 2 is viewed from the front in the transport direction, the dust on the right side (left side) of the original document is transported to the left side of the drive roller 2. It takes time, but elsewhere the elimination takes less time.

However, the embodiment shown in FIG. 1 is the most effective in that dust at all positions on the document is quickly removed to both ends of the drive roller outside the document.

The present invention is not limited to a mechanism for transporting a sheet such as a document or a recording sheet, but is also applicable to a mechanism for transporting another flat medium.

[0027]

As described above, according to the present invention,
By transporting a flat medium such as a document using a transport roller with spiral grooves without increasing the size of the transport mechanism, dust such as paper dust and rubber roller shavings can be transported outward from the transport path. Can be discharged.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a transport mechanism of the present invention.

FIG. 2 is a view showing the operation of a driving roller in FIG. 1;
FIGS. 3A and 3B are enlarged perspective views of a left end portion of a driving roller as viewed from a document conveying direction.

FIGS. 3A and 3B are diagrams showing a continuation of FIG. 2 in the operation of the drive roller in FIG. 1; FIGS. 3A and 3B are perspective views in which a left end portion of the drive roller is enlarged when viewed from a document conveying direction;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 original 2 drive roller 3 driven roller 4 platen roller 5 reading device 6 transport guide 7 transport guide

Claims (3)

[Claims] 1. A transport mechanism having a roller for transporting a planar medium, wherein the roller has a spiral groove on a surface arranged on the medium and in contact with the medium. 2. The spiral groove is formed in such a manner that the spiral is wound around a predetermined position in the roller axial direction, and when the roller is viewed from the front in the transport direction, the spiral groove is formed. The transport mechanism according to claim 1, wherein the transport mechanism is formed so that the left side from the predetermined position is lower left and the right side from the predetermined position is lower right. 3. The spiral groove is formed so that the spiral is wound around a center portion in the roller axial direction as a boundary, and when the roller is viewed from the front in the transport direction, the spiral groove is formed. 2. The transport mechanism according to claim 1, wherein the transport mechanism is formed so that the left side from the center portion is lower left and the right side from the center portion is lower right.