JP2539171Y2 - Reader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a reading device provided in, for example, a facsimile or the like for reading a sheet-shaped document.

[Conventional technology]

For example, in a reading apparatus such as a facsimile as shown in FIG. 6, when reading a sheet-shaped original 9, the original 9 is sandwiched between the transport roller 1 and the pressure roller 3, and between the transport roller 2 and the pressure roller 4. When these rollers rotate in the directions indicated by the arrows, the original 9 is guided in the conveyance path between the upper guide plate 8 and the lower guide plate 6, and during this time, the opening of the lower guide plate 6 in the middle of the conveyance path. An image such as a character on the original 9 is read by an optical path 10 penetrating through the contact glass 5 provided on the side of the document.
A white pressure plate 7 for a white level is disposed at a predetermined distance from the white pressure plate 7.

[Problems to be solved by the invention]

However, in such a conventional reading apparatus, the white pressure plate 7 is arranged at a predetermined distance away from the contact glass 5 for smooth conveyance of the original 9, so that the conveying roller 1 When the peripheral speed changes in each of the first and second documents, the original 9 flaps between the white pressure plate 7 and the contact glass 5 which are separated from each other, as indicated by a two-dot chain line in FIG. However, even if a straight line image is read by fluttering in this way, there is a problem that the linearity is impaired because the image is read with fluctuation.

In addition to such a conventional example, there is a method in which a white roller is used in place of the white pressure plate to prevent fluttering of the original by reading while holding down the white roller. Of the document, and the background of the document may be scanned.

Then, this invention makes it a subject to solve such a problem.

[Means for solving the problem]

In order to solve the above problems, the present invention has the following configuration.

(1) A contact glass provided in a reading section in the middle of a sheet-like document conveyance path, a white pressure plate provided on the opposite side of the conveyance path opposite to the contact glass, and In a reading device including a document transport roller provided on the downstream side in the transport direction and a pressure roller that presses against the document transport roller to apply a transport force to the document, the reading device includes a roller portion of the pressure roller other than a roller portion. A plurality of sheet-like elastic bodies attached and circling around are provided, and the distal end of the elastic body operates within a range downstream of the reading position of the reading unit in the document conveying direction, and at least one elastic body. The body presses the document being conveyed by the document conveying roller onto the contact glass.

(2) a contact glass provided at a reading section in the middle of a sheet-shaped document conveyance path, a document conveyance roller provided downstream of the reading section in the document conveyance direction, and an axis parallel to the axis of the document conveyance roller. A plurality of sheet-like elastic members that are attached to a shaft and rotate to contact the document to apply a conveying force, wherein the elastic member has a white color, and the tip of any one of the elastic members is always provided. Is located upstream of the reading position of the reading section in the document transport direction.

[Action]

In the configuration of the above (1), the sheet-like elastic body provided at a position other than the roller portion of the shaft portion of the pressure roller is:
By rotating around the pressure roller, the leading end thereof presses the document on the contact glass, and the document at the reading position can be accurately positioned in the optical path direction. Further, since the distal end of the elastic body operates within a range downstream of the reading position in the document transport direction, the white pressure plate is not blocked by the distal end of the elastic body, and the function of the white level is not impaired.

In the configuration of the above (2), instead of the pressure roller, the leading ends of the plurality of sheet-like elastic bodies successively rotate while contacting the original while being deformed, thereby imparting a conveying force. The fluttering can be prevented by suppressing the original. In addition, since the elastic body has a white color and the tip of one of the elastic bodies is always located on the upstream side in the document conveying direction from the reading position, the white elastic body can be used for the white level without a separate white pressure plate. Can be used.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 4 show an embodiment of the reading device according to the present invention. The same components as those in the conventional example are denoted by the same reference numerals, and the description of the configuration and operation common to those already described is omitted.

FIG. 1 shows the configuration of a reading device. In this reading device, as shown in FIG. 2, a shaft portion 4a between two roller portions of a pressure roller 4 is provided with a shaft as shown in FIG.
A sheet-like elastic body 11 is provided so as to extend in the radial direction. The elastic body 11 shown in FIGS. 2 and 3 shows a shape when the reader is not operated, but when the reader is operated, the pressure roller 4 rotates in the direction of the arrow in FIG. The elastic body 11 also swings in the same direction, but its length is much larger than the shortest distance from the axis 4a to the original 9, so that the leading end of the elastic body 11 starts to contact the original 9, and then presses the original 9 down. While maintaining contact for a fairly long distance. FIG. 4 is a perspective view showing the shape of the elastic body 11 at this time. As described above, during operation of the reading device, the leading end of the elastic body 11 rotates with the roller 4 and presses the document 9 on the contact glass 5 to accurately position the document 9 at the reading position in the direction of the optical path 10. Therefore, for example, it is possible to reliably prevent the linear image from being read while fluctuating. The length of the elastic body 11 is set so that the tip of the elastic body 11 does not reach the reading position, that is, the irradiation position of the optical path 10 on the contact glass 5 in FIG. For this reason, it is possible to prevent the white pressure plate 7 from being blocked by the distal end portion of the elastic body 11 and impairing its white level function. As described above, since the white pressure plate 7 is used for the white level, the color of the elastic body 11 does not need to be white, and the material may be rubber, mylar sheet, piano wire, or the like.

FIG. 5 shows another embodiment of the present invention. In the above-described embodiment, the elastic body 11 is provided on the shaft portion 4a other than the roller portion of the pressure roller 4. On the other hand, in this embodiment, there is no roller portion of the pressure roller and the shaft portion 14a is provided.
There is only a, and four sheet-like elastic bodies 21 having a length longer than the reading width of the document are provided on the periphery thereof. As described above, in this embodiment, instead of the pressure roller, the leading ends of the four elastic members 21 come into contact with the document one after another to apply a conveying force. At this time, the leading ends of the elastic members 21 are deformed as shown in the drawing. The document can be held down, and the flutter can be prevented.
The elastic body 21 is formed of a white mylar sheet or the like, and the leading end of one of the elastic bodies 21 is always upstream of the reading position (the position of the optical path 10 in FIG. 1) in the document conveying direction (the first position). The length of the elastic body 21 is set so as to be positioned on the right side in the figure). Therefore, the white elastic body 21 can be used for a white level without providing a white pressure plate separately.

In the above embodiment, the elastic body is provided between the roller portions, but may be provided outside the roller portion. Further, since the elastic body rotates together with the pressure roller, the elastic body also acts as “projection” on the downstream side in the document conveyance direction after passing through the conveyance roller 2.

[Effect of the invention]

As described above, according to claim (1) of the present invention, the sheet-like elastic body provided at a position other than the roller portion of the shaft portion of the pressure roller hangs around the pressure roller, and the leading end portion thereof rotates. Since the original is pressed onto the contact glass and the original at the reading position can be accurately positioned in the optical path direction, the original image can be read with high precision without causing image distortion or the like. It is possible to reliably prevent the linear image from being read while fluctuating. In addition, since the tip of the elastic body operates within a range on the downstream side in the document conveying direction from the reading position,
The white pressure plate is not blocked by the tip of the elastic body, and the function of the white level is not impaired.

According to the second aspect of the present invention, instead of the pressure roller, the leading ends of the plurality of sheet-like elastic bodies successively contact the original and rotate while being deformed, thereby imparting a conveying force. At this time, the original can be suppressed and fluttering can be prevented. In addition, since the elastic body has a white color and the tip of one of the elastic bodies is always located on the upstream side in the document conveying direction from the reading position, the white elastic body can be used for the white level without a separate white pressure plate. Can be used.

[Brief description of the drawings]

1 to 4 are views showing an embodiment of a reading apparatus according to the present invention, FIG. 1 is a structural view thereof, FIG. 2 is a side view of a pressure roller and an elastic body, and FIG. 3 is a pressure roller. FIG. 4 is a perspective view of the elastic body, FIG. 5 is a partial perspective view of the elastic body showing another embodiment of the present invention, and FIG. 6 is a configuration diagram of a conventional reader. . 1,2 ... Convey roller 3,4 ... Pressure roller 4a, 14a ... Shaft 5 ... Contact glass, 6 ... Lower guide plate 7 ... White pressure plate, 8 ... Upper guide plate 9 ... Document, 11,21 …… elastic body

Claims (2)

(57) [Scope of request for utility model registration] A contact glass provided at a reading section in the middle of a conveyance path for a sheet-shaped document; a white pressure plate provided opposite to the contact glass on the opposite side of the conveyance path; In a reading apparatus including a document transport roller provided downstream of a document transport direction and a pressure roller that presses against the document transport roller and applies a transport force to the document, a shaft other than a roller portion of the pressure roller is provided. A plurality of sheet-like elastic bodies attached to and rotating with respect to each other, and a tip of the elastic body operates within a range on the downstream side of the reading position of the reading unit in the conveyance direction of the document, and at least one sheet of the elastic body. A reading device, wherein the elastic body presses a document conveyed by the document conveying roller onto the contact glass. 2. A contact glass provided at a reading section in the middle of a sheet-shaped document conveying path, a document conveying roller provided downstream of the reading section in the document conveying direction, and an axis of the document conveying roller. And a plurality of sheet-like elastic members which are attached to a shaft parallel to and rotate so as to contact the original and apply a conveying force, wherein the elastic member has a white color and any one of the elastic members. Wherein the leading end of the document is located upstream of the reading position of the reading section in the document transport direction.