JP3338191B2 - Book original transporter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a book original conveying apparatus used in an image forming apparatus such as a copying machine or a printer, and more particularly, to an apparatus in which an upstream conveying roller and a downstream conveying roller are arranged at upstream and downstream positions of an image reading section, respectively. The present invention also relates to a book document conveying device which supports these rollers so as to move up and down in accordance with the thickness of the book document, and conveys the book document without causing an impact when passing through the rollers.

[0002]

2. Description of the Related Art Generally, in an image forming apparatus such as a copying machine or a printer, an image of a document is read by scanning a moving platen on which a sheet-shaped or book-shaped document to be copied is placed, or placing the document on a fixed platen. This is done by scanning the optical system with the device placed. In recent years, instead of such a configuration, a so-called original moving type apparatus has been implemented in which an original to be copied is moved and scanning is performed without scanning the platen or the optical system. The original moving type apparatus is particularly useful for an apparatus using a large original such as A0 or A1 size, and does not require a scanning mechanism for moving a heavy apparatus such as a platen or an optical system. There is an advantage that the configuration can be simplified and the size can be reduced.

[0003] In this type of apparatus, an upstream conveying roller and a downstream conveying roller are generally provided at upstream and downstream positions of an image reading section, respectively, and the sheet-like or book-shaped document is traversed by the conveying rollers by the image reading section. Exposure scanning is performed by passing the light.

Conventionally, the upstream transport roller and the downstream transport roller are provided so as to move up and down independently of each other, that is, movably in the thickness direction of the document to be transported. The upstream transport roller and the downstream transport roller are each pushed up by the document, and allow the document to pass therethrough and act to transport the document in a predetermined direction by contact with the document.

[0005]

In such a configuration, when a document to be conveyed is a document such as a book having a certain thickness or more (hereinafter, referred to as a book document), the document described above is generally used. Although the apparatus having the above configuration is used, when the book document enters the upstream transport roller or the downstream transport roller, impact (or vibration) is given to the document or the machine by collision between the leading edge of the book document and the roller. Such an impact does not cause a serious problem when entering the upstream roller, but the impact (or vibration) when the document enters the downstream transport roller is already being read while the image of the book document is being read. There is a serious problem that a high quality copy image cannot be formed due to a natural blur or an error.

[0006]

[0007]

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is directed to a book original conveying apparatus for conveying a book original along a platen to an image reading unit.
A frame for supporting an upstream transport roller in a book document transport device in which an upstream transport roller and a downstream transport roller are respectively disposed at upstream and downstream positions of the image reading unit, and a book document is transported by these transport rollers and passes through the image reading unit. The apparatus is pivotally supported with respect to the apparatus main body at a position downstream of the upstream conveyance roller, and the frame apparatus is supported with a downstream conveyance roller pivotally so that the roller is located downstream with respect to a pivot point. The upstream and downstream transport rollers are urged by independent urging means in the direction of pressing the book document, and the downstream transport roller is moved to the rollers according to the upward movement of the upstream transport roller pushed up by the book document. Is operated to move upward prior to the entry of the book original.

[0009]

In such a configuration, when the upstream transport roller is pushed up due to the entry of the book document, the interlocking means moves the downstream transport roller upward prior to the entry of the book document, and moves the book document to the downstream transport roller. Easy entry and minimizes impact due to collision with downstream transport rollers.

[0010]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 3 are schematic side views showing different operation states of an example of a book document conveying device according to the present invention, and FIG. 4 is a top view thereof.

In FIG. 1 to FIG. 3, reference numeral 1 denotes a platen for guiding a book original along its upper surface, and the book original is oriented from left to right in FIG. It is entered manually and guided to cross the image reading unit 2. Although not shown, an optical device such as a CCD scanner or a lens / mirror is arranged below the image reading unit 2 to digitally read an image of a book document passing through the image reading unit 2 or to read an analog image. And a copied image is formed by a well-known electrophotographic system according to the read information. Further, a suitable guide member is provided on the platen so as to be detachable or movable in accordance with the size of the document so as to press the side surface of the book document and guide the book document in a predetermined direction.

At each of an upstream position and a downstream position of the image reading unit 2, an upstream transport roller 3 and a downstream transport roller 4 are disposed above the platen 1 so as to face the platen 1, in other words, a book document guided on the platen. It is arranged so as to be in contact with the rear surface and transport it. The upstream transport roller 3 and the downstream transport roller 4 are composed of rollers having substantially the same diameter, and as shown in FIG.
Are attached at appropriate intervals.

As shown in FIG. 4, the support shafts 6 and 7 of the upstream transport roller 3 and the downstream transport roller 4 are supported at both ends by a pair of frame devices 8 having a left-right symmetric structure. The frame device 8 is supported by a fixed portion 11 of the device main body at a position downstream of the upstream transport roller 3 by two vertically parallel arms 9 and 10, respectively. In the illustrated example, one end of each of the arms 9 and 10 is pivotally attached to the fixing portion 11 by pins 12 and 13, and the other end is pivotally attached to the frame 16 of the frame device 8 by pins 14 and 15. The frame device 8 is formed so as to be movable up and down.

The frame 16 has a shape which is bent in a U-shaped cross section in a direction perpendicular to the plane of FIG.
One end of each of the arms 9 and 10 is provided on the inner surface of the
It is pivoted by 4 and 15. On the other hand, on the inner wall 16b of the frame 16, the support shaft 6 of the above-described upstream transport roller 3 is
7 rotatably supported. Pulleys 18 are fixed to both ends of the support shaft 6, respectively.
The drive transmission belt 19 hung on 8 receives a drive from a suitable driving device, and rotates the support shaft 6 and thus the upstream transport roller 3 at a predetermined speed. This drive is performed by the drive transmission belt 19.
To the support shaft 7 of the downstream transport roller 4 described later,
The downstream transport roller 4 is rotated at the same speed as the upstream transport roller 3.

On the other hand, arms 21 are respectively supported on inner walls 16b of the left and right frame bodies 16 by columns 22 so as to be pivotable. The arm 21 extends downstream, and the support shaft 7 of the above-described downstream transport roller 4 is rotatably supported by a bearing 23 at one end thereof. The drive transmission belt 19 is hung to apply drive to the downstream transport roller 4.

In such a configuration, FIGS.
As shown in FIG. 5, the frame device 8 is constantly urged in the direction in which the upstream transport roller 3 comes into contact with the platen 1 by a tension spring 26 having one end attached to the frame device 8 and the other end attached to the device main body at both side positions. I have. Similarly, the other end of the tension spring 27 having one end attached to the frame device 8 is attached to the end of the arm 21 supporting the downstream transport roller 4 opposite to the end supporting the roller 4. The downstream transport roller 4 is constantly urged in a clockwise direction as viewed in the drawing, that is, in a direction in contact with the platen 1.

Next, the operation of the above configuration will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 1 shows a state before a book document is transported, and includes an upstream transport roller 3 and a downstream transport roller 4.
Both are in contact with the platen 1 or at a position close to the platen 1. In this state, when the book document B is inserted into the upstream transport roller 3 along the upper surface of the platen 1 from the left side of the figure, as shown in FIG. 2, the upstream transport roller 3 is pushed up by the book document and follows the thickness thereof. Move upward. This movement simultaneously moves the downstream transport roller 4 upward through the arm 21. As is clear from the drawing, the amount of movement of the downstream transport roller 3 that moves in conjunction with the movement is set so as to be smaller than the thickness of the book document B that enters.

The upstream transport roller 3 pushed up by the book original transports the book original B so as to pass through the image reading section 2 by rotation thereof and sends it to the downstream transport roller 4. At this time, the downstream transport roller 4 is
Since the book document B has already been moved upward and is in a position to receive the thickness of the book document B, the book document B enters the downstream transport roller 4 smoothly without any shock (or vibration), and blurs when reading an image. It does not occur.

Next, when the rear end of the book document B passes through the upstream transport roller 3, the transport roller 3
Returns to the position shown in FIG. 1 and stands by for the next document feed.

[0020]

As described above, according to the present invention, it is possible to minimize the impact due to the collision with the transport rollers during the transport of the book document, and perform reading without image blurring.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing a standby state of a book document conveying device according to the present invention.

FIG. 2 is a schematic side view of the book document feeder showing a state different from that of FIG. 2;

FIG. 3 is a schematic side view of the book document feeder showing a state different from that of FIG. 1 or 2;

FIG. 4 is a schematic top view of the book document conveying device of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Platen 2 Image reading part 3 Upstream conveyance roller 4 Downstream conveyance roller 8 Frame device

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B65H 5/06 G03B 27/62 G03G 15/00 107 H04N 1/00 108

Claims (1)

(57) [Claims] In a book document conveying device for conveying a book document to an image reading section along a platen, an upstream conveying roller and a downstream conveying roller are arranged at upstream and downstream positions of the image reading section, respectively. In a book document transporting device that transports a book document and passes through an image reading unit, a frame device that supports an upstream transport roller is pivotally supported with respect to the apparatus body at a position downstream of the upstream transport roller, and the frame device The downstream transport roller is pivotally supported so that the roller is located downstream with respect to the pivot point, and the upstream and downstream transport rollers are biased in a direction of pressing the book document by independent biasing means. Following the upward movement of the upstream transport roller pushed up by the book document, the downstream transport roller A book document feeder that operates to move upward before a document enters.