JPH0330568A - Picture reader - Google Patents

Abstract

PURPOSE:To keep a conveying path for original read near a read position comparatively narrow and stable by providing an energizing member to energize an original guiding member in a direction where a spacer and a transparent member are abutted. CONSTITUTION:An original guiding member 13 is equipped with a leg (spacer) 14 so that the narrow path (conveying path for original read) can be formed in an interval to a transparent member G. Then, the enough stable conveying path is formed by the energizing force of a coil spring 12. Thus, even when the rear end part of an original transmits through carry-in rollers 4a and 4b, the original guiding member 13 is prevented from floating-up by the restoring characteristic of the original and the path width of the conveying path for original read is not changed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an image reading device such as a copying machine or a facsimile machine, and particularly relates to document conveyance technology during image reading.

(Prior Art) Conventionally, as this type of image reading device, there is one shown in FIG. 4, for example. In the figure, a transparent member 102 such as a platen glass is provided on the upper surface of the reading device body equipped with a reading means 101.
A document transport device is mounted on top. The document conveyance device has a document feed section and a discharge section provided on the same side, and conveys the document S along a conveyance path that has a curved shape, for example, a letter 0.
Upstream and downstream conveyance means, that is, input rollers 103
a, 103b and discharge roller 104a.

104b. A thin transparent document scooping sheet 106 is provided between the outer frames 105a and 105b that pivotally support these rollers, and this sheet guides the document diagonally from above to the reading position C by carry-in rollers 103a and 103b. After passing the reading position, the leading edge of the document is scooped up again and sent to the ejection rollers 104a, 10.
It is designed to lead to 4b. Here, the carry-in roller 103
a.

103b and discharge rollers 104a and 104b are rotating at a constant speed. A document guide member 108 is provided which is rotatable about the ejection roller shaft 107, and a spacer 109 of the document guide member 108 is attached to the transparent member 109.
02, the transparent member near the reading position
The interval between the document guide members can be made extremely narrow, and a passage can be formed using this as a conveyance path for document reading (however, the thickness of the document scooping sheet is ignored). Therefore, it is possible to bring the document S close to the transparent member 102 and always maintain a constant distance therefrom, so that the magnification of the read image by the reading means 101 can be made uniform, and a good read image can be obtained.

(Problem to be Solved by the Invention) However, in the case of the above-mentioned conventional technology, after the document S passes through the reading position C and reaches the ejection rollers 104a and 104b, the rear end of the document S is transferred to the carry-in roller 103a. , 10
3b is removed, the loading rollers 103a and 1
03b and the ejection rollers 104a and 104b, the document S is fed in a curved state by the ejection rollers 104a and 104b.
Only 04a and 104b are transported, and the rotatable document guide member 108 is pushed up by the resilience of the document itself, and the document S sometimes tries to return to a straight line (flat state) (
(Indicated by the broken line in Figure 4). At this time, the conveying force is used to eliminate the slack in the document S, and the ejection rollers 104a, 10
Although the conveyance amount of 4b is constant, the reading position C
, a situation occurs in which there is no movement of the document S, and the same part of the document S is read repeatedly at a constant resolution, resulting in blurring at the trailing edge of the read image, resulting in poor quality reading. There were drawbacks such as difficulty in obtaining images.

The present invention has been made to solve the problems of the prior art described above, and an object thereof is to provide an image reading device that eliminates image blur caused by the restorability of a document.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes transport means on the upstream and downstream sides in the transport direction that transports the document along a transport path that has a curved shape; A reading means is provided at a reading position between the side and downstream side conveying means and reads image information on the conveyed document through a flat transparent member, and a spacer abuts on the transparent member, and the spacer abuts on the transparent member. In an image reading device comprising a document guide member that is movable so as to form a document reading conveyance path having a constant interval with respect to a transparent member near a position, the document guide member is moved in a direction in which the spacer and the transparent member come into contact with each other. It is characterized by comprising a biasing member that biases the.

(Function) In the present invention having the above configuration, by providing a biasing member that biases the document guide member in the direction of contact between the spacer and the transparent member, the document can be moved from the conveyance means upstream of the reading position. When the rear end portion is opened, the original guide member can be prevented from being pushed upward due to the resilience of the original.

(Examples) The present invention will be described below based on illustrated examples. FIG. 2 is an overall configuration diagram showing an image reading device according to an embodiment of the present invention.

In the figure, a document conveyance device A is mounted on a transparent member G (for example, a platen glass, etc.) of a main body B of a reading device. When an instruction to start reading is input to the apparatus, a motor (not shown) of the document transport device A is driven, and each transport roller l to
5 starts rotating. Through this operation, the plurality of originals 7 set on the original paper feed tray 6 with the image side facing upward are fed one by one from the top, and are fed into the conveyance path that forms a curved U-shape. transported along.

At a certain point, the conveyed document 7 makes a U-turn along the curved conveyance path, turns the image surface downward, and moves to the reading position C.
The carry-in roller 4a is located on the upstream side.

4b, it is fed diagonally upward toward the reading position C.

The original 7 that has passed through the reading position C is fed upward again along the conveyance path to the ejection roller 5 located downstream of the reading position C.
a, 5b, and the document is transported by the carry-in rollers 4a, 4b and the discharge rollers 5a, 5b.

During this conveyance, the document image is read by the reading means 8 disposed in the reading device main body B below the reading position C.

Reading by the reading means 8 is performed, for example, by irradiating light through a flat transparent member 9 and forming an image of the reflected light on the image sensor 9. Thereafter, the document 7 is discharged onto the paper discharge tray 10 by discharge rollers 5a and 5b.

FIG. 1 is an enlarged view of the vicinity of the above-mentioned reading position, in which the original 7 is conveyed by carry-in rollers 4a and 4b, and the original guide member 1
3 and a document scooping sheet 14 positioned below it and fixed along the transparent member G, passes through the reading position C, is scooped up again, and is scooped up again by the ejection rollers 5a, 5b to output tray l
is discharged to O. The document guide member 13 is configured to be able to rotate vertically about the discharge roller shaft 5c as a fulcrum, and is further provided with attachments fixed to support plates 11 that protrude from the left and right side plates of the document transport device 8 main body (not shown). The transparent member G is biased by a coil spring 12 as a biasing member.

The document guide member 13 has legs (spacers) 14 outside the document conveyance path so as to form a narrow path (conveyance path for document reading) between it and the transparent member G, and is sufficiently stabilized by the biasing force of the coil spring 12. A conveyance path can be formed. That is, even if the trailing edge of the document passes through the carry-in rollers 4a and 4b, the document guide member 13 will not be lifted up due to the restorability of the document, and the width of the document reading conveyance path will not change.

FIG. 3 is a block diagram showing another embodiment of the present invention. In this embodiment, a sponge member 2 such as maltbrain is used as a biasing member between the support plate 11 and the document guide member 13.
1 is provided, and the present invention can be carried out at a lower cost than using the coil spring 12 in the first embodiment.

Further, a weight having a weight corresponding to the biasing force of the elastic body of the coil spring 1 may be provided on the document guide member 13 as a biasing member.

(Effects of the Invention) The present invention has the above-described configuration and operation, and by providing a biasing member that biases the document guide member in the direction of contact between the spacer and the transparent member, the biasing member is provided on the upstream side of the reading position. When the trailing edge of a document is released from a certain conveyance means, the document guide member is prevented from being pushed upward due to the resilience of the document, and the document reading conveyance path near the reading position is kept relatively narrow and stable. This has the effect of eliminating the trailing edge blur of the read image caused by the floating phenomenon of the original due to its stiffness (restorability), and resulting in a high-quality read image without any disturbance.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of the vicinity of the reading position in an image reading device according to an embodiment of the present invention, FIG. 2 is an overall configuration diagram showing an image reading device implementing the present invention, and FIG. FIG. 4 is a block diagram showing an embodiment of the present invention, and is a block diagram of the vicinity of the reading position in a conventional image reading device. Explanation of symbols 4a. 4b... Carrying-in roller (upstream conveyance means) 5a,
5b... Carrying out roller (downstream conveying means) 8... Reading means 12... Coil spring (biasing member) 13... Original guide member 14... Spacer 21...
・Moltobrain (biasing member) G...Transparent member

Claims (1)

[Scope of Claims] Conveyance means on the upstream and downstream sides of the conveyance direction that convey the document along a conveyance path that describes a curved shape, and the document being conveyed at a reading position between the upstream and downstream conveyance means. a reading means for reading image information through a flat transparent member; and a spacer that abuts the transparent member, and the abutment creates a document reading conveyance path having a constant spacing with respect to the transparent member near the reading position. An image reading apparatus comprising a document guide member that is movable to form a document, further comprising a biasing member that biases the document guide member in a direction in which the spacer and the transparent member come into contact with each other. Device.