JPS63138863A - Book scanner - Google Patents

Abstract

PURPOSE:To surely press the end part of an original onto an original platen by energizing an original guide in the direction of the original platen by means of a spring member. CONSTITUTION:Even if at least the end part of an original 1 or a filed document placed on the original platen 19 is folded extremely or curled, since the end part of the original 1 or the filed document is pressed onto the original platen from the ground paper 20 at the tip of the original guide energized in the direction of the original platen 19 by the weight of the original guide itself and the tensile force of the tensile spring 22, the filed document or the end part of the original 1 is in contact onto the original platen 19. Moreover, the tail end of the original guide 8 is in light contact onto a paper discharge roller 9 by the weight of the original guide 8 itself, the original 1 discharged from a platen roller 7 is abutted with the discharge roller 9 and discharged surely to the paper discharge plate 11, but the original guide 8 is energized in a direction opposite to the original platen 19 by the tensile force of the tensile spring 22 and the contact pressure between the original 1 and the paper discharge roller 9 is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a book scanner used in an image reading section of a facsimile machine, a copying machine, an image reading device, etc.

(Conventional technology) FIG. 2 shows the appearance of a conventional book scanner.

FIG. 3 shows the internal structure of a conventional book scanner, and FIG. 4 shows details of the paper ejection section of the automatic document feeder of the conventional book scanner.
When a sheet manuscript 1 [hereinafter referred to as manuscript 1 (see Figure 4)] is placed on the paper feed table 2 and the book scanner is started,
Paper feed roller 32 separation roller 4. Conveyance roller 5. An automatic document feeder 10 consisting of a document guide 6, a platen roller 7, a document guide 8, a paper ejection roller 9, etc. sequentially transports the document 1 from the paper feed table 2 to the paper ejection table 11 which also functions as a document pressure plate. , light g121 reflection fi13.14゜1
5. Optical system 1 consisting of a condensing lens 16 and a light receiving element 17
8, at the conveyed document reading position (see Figure 4),
The images of the transported document 1 are read in sequence (see Figure 3).
.

In addition, a bound manuscript such as a book or manuscript 1 placed on a manuscript table 19 (see Fig. 3 and Fig. 4 @) made of a transparent plate material such as glass.
When the book scanner is started with the document being pressed against the document table 19 by the paper eject table 11 which also serves as a document pressing plate, the placed document reading start position W (see FIG. 4) and the placed document reading limit position M ( (See FIG. 3), the image of the loaded original or original 1 is repeatedly read for a desired number of copies.

By the way, in the conventional book scanner configured as described above, the conveyed original reading position and the loaded original reading starting position are very close to each other as shown in FIG.
A part of the mount 20 that is fixed to the bottom of the paper ejection tray 11 is attached to the paper ejection tray 1.
1, protruding from the end of the placed document reading start position side,
The document guide 8, which is swingably attached to the automatic document feeder lO, is placed on the protrusion of the mount 20 (see FIG. 4).
This prevents the mount 20 from being lifted up by the stacked original or original 1 whose end portion is bent or curled.

However, since the document guide 8 is short and lightweight, if the document 1 is severely bent or curled, the mount 20 will lift up, causing distortion or shadows on the read image of the folded or curled portions. The problem was that it could be done.

(Object of the Invention) The object of the present invention is to prevent the edges of a bound manuscript such as a book or a sheet manuscript from being bent or curled, regardless of the degree of bending or curling. Our goal is to provide a book scanner that can be used reliably.

(Structure of the Invention) In the present invention, a document guide is urged toward a document table by a spring member.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to one drawing.

FIG. 1 shows the configuration of an embodiment of the present invention. The same reference numerals as those in FIGS. 2, 3, and 4 indicate the same parts, and 22 indicates the automatic Document feeder 1
The tension spring 29 has one end attached to the fixed part of the document guide 8 and the other end attached to the document guide 8 which is swingably supported by the automatic document feeder 10. One end is biased toward the document table 19, that is, clockwise in the figure.

In this embodiment configured as described above, even if at least the edge of the bound original or original 1 placed on the original table 19 is severely bent or curled, the weight of the original guide 8 itself and the tension of the tension spring 22 can be maintained. The tip of the document guide 8, which is urged in the direction of the document table 19 by force, presses the end of the loaded document or document 1 from above the mount 20 onto the document table 19, so that The edge of is the original platen 1.
Closely attached to 9.

Also, the rear end of the 1M document guide 8 lightly contacts the paper discharge roller 9 due to the weight of the document guide 8 itself.

The original 1 ejected from the platen roller 7 comes into pressure contact with the ejection roller 9 and is securely ejected onto the paper ejection stand 11. Opposite direction from platform 19.

That is, the document 1 is further biased clockwise in the figure, and the contact pressure between the document 1 and the discharge roller 9 increases.

In the embodiment of the present invention, the tension spring 22 is used as a means for biasing the document guide 8 toward the document table 19. However, instead of this, a spring member such as a compression spring or a plate spring may be used. May be used.

Further, the ffi original reading start position and the placed original reading limit position are determined simply by the original reading direction of the optical system 18, and the positions may be reversed.

(Effects of the Invention) As explained above, according to the present invention, even if the edges of a 1M document are severely bent or curled, it can be easily processed.

Since the edge of the document is pressed against the document table at one end of the document guide, which is urged toward the document table by the spring force of the spring member, there is no distortion or shadow in the scanned image. There is an effect.

Further, since the contact pressure between the original and the paper ejection roller is increased, and the paper ejection force of the paper ejection roller is increased, even thick originals can be easily ejected.

[Brief explanation of the drawing]

Fig. 1 is an enlarged cross-sectional view of essential parts showing the configuration of an embodiment of the present invention, Fig. 2 is a perspective view showing the external appearance of a conventional book scanner, and Fig. 3 shows the internal structure of a conventional book scanner. FIG. 4 is an enlarged sectional view of a main part showing the configuration of a paper discharge section of a conventional automatic document feeder for a scanner. 1...Mail manuscript, 6,8...Manuscript guide,
9... Paper ejection roller, 10... Automatic document feeder, 11... Paper ejection table also used as document pressure plate, 18... Optical system, 19... H8 unit, 20... Mounting sheet, 22・・・
・Spring parts. Patent applicant Rico Co., Ltd. - Figure 1 Figure 2

Claims (2)

[Claims] (1) Image reading of a sheet original transported by an automatic document feeder using a fixed optical system, or a bound original such as a book or a sheet original placed on a document table using the moving optical system In a book scanner that reads images, a portion of a mount fixed to the bottom of the document pressure plate that protrudes from the document pressure plate toward the automatic document feeder is biased toward the document table by a spring member. A book scanner characterized in that one end of a document guide is pressed against the document table. (2) The book scanner according to claim (1), wherein the document guide has a rear end in pressure contact with a paper ejection roller.