JPH01236146A - Original paper feeder - Google Patents

Abstract

PURPOSE:To make a reading part so as to read an original righteously by constituting it to give load smaller than feeding force of the original to at least more than two spots parted at both sides of the original in the opposite feeding direction at an interval between a feed roller and a read roller. CONSTITUTION:An original 10 set onto an original table is fed one by one after being discriminated by a feed roller 12 and a separator 14, and delivered to a reading part of an image sensor 18 by a read roller 16. With this delivery, the original 10 is taken out one by one, having each one read in a main scanning direction X as feeding it in a sub-scanning direction Y. Here if the original 10 is fed by the feed roller in leaving it set in a state of being skewed intact, a tip of the original comes into contact first with either of two loading means 20, 20. If so, bending moment is produced in the original 10 with a side of the loading means 20 previously contacted as the fulcrum point, as in an arrow E, by load in the opposite feeding direction given to the original 10 from the loading means 20 previously contacted, and thus any skew of the original 10 is remedied.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a document feeding device used in an image reading device or the like.

2. Description of the Related Art A conventional apparatus of this type has a document 10 as shown in FIG.
a separator 14 that separates the originals 10 one by one by slidingly contacting the fed paper o-212; and a reading roller that feeds the separated originals 10 to the reading section of the image sensor 18. 16, the originals 10 set on a document table (not shown) are taken out one by one and read in the main scanning direction X while being fed in the sub-scanning direction Y.

In this case, the paper feed roller 12 is rotated and driven in the direction of the arrow (A) from the rotating shaft 12A via the one-way clutch mechanism, thereby feeding the document 10 in the direction of the arrow (A).

Further, the reading roller 16 frictionally engages with the document 10 fed from the paper feed roller 12, and is rotationally driven in the direction of arrow (B), thereby driving the document 10 in the sub-scanning direction Y. Then, it is delivered to the reading section of the image sensor 18.

Here, the reading roller 16 feeds the document 10 to the reading section at a driving speed slightly faster than the driving speed of the paper feed roller 12. This prevents the document 10 from sagging during feeding. At this time, the paper feed roller 12 rotates along with the document 10 driven by the reading roller 16 through the intervention of the one-way clutch mechanism.

Problems to be Solved by the Invention However, with this configuration, there is a problem in that the original is often fed crooked and read diagonally.

The above problem arises for the following reasons.

That is, since the speed at which the document is driven by the reading roller is faster than that of the paper feed roller, if there is a slight bend in the document that has been sent, the document 10 and the paper feed roller 12 will be separated from each other, as shown in FIG. A rotational moment is generated in the direction of the arrow (toward) using the abutting part as a fulcrum.

For this reason, the curvature of the original 100 increases greatly during feeding, and the original 10 ends up being read diagonally.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a document feeding device that can feed a document from an appropriate direction to a reading unit and read the document correctly.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a paper feed roller that discriminates and feeds original documents one by one, and a feed roller that feeds the originals fed from this paper feed roller to a reading section. The apparatus is configured to apply a load smaller than the feeding force of the original in the opposite feeding direction to at least two or more locations distributed on both sides of the original between the reading rollers. .

According to the above-described structure, the present invention allows a document set in a crooked state to receive a rotational moment in a direction that corrects the crookedness while being fed from the paper feed roller to the reading roller. Therefore, it becomes possible to send the original to the reading section from the proper direction and read it correctly.

Embodiment FIGS. 1 and 2 show a schematic configuration of a document feeding device according to an embodiment of the present invention, in which 10 indicates a document, 12
is a paper feed roller, 14 is a separator, 16 is a reading roller,
18 is an image sensor, and 18 is a load means.

Here, the paper feed roller 12 is rotationally driven in the direction of arrow 0) from the rotating shaft 12A via a one-way clutch mechanism (not shown), thereby feeding the original 10 in the direction of arrow 0).

The separator 14 is constituted by a plate-shaped elastic friction member such as rubber, and separates the originals 10 one by one by slidingly contacting the paper feed roller 12 with the originals 10 interposed therebetween.

The reading roller 16 is rotationally driven in the direction of the arrow (b), thereby delivering the document 10 that has been discriminated and fed from the paper feed roller 12 to the reading section of the image sensor 18 . This reading roller 16 feeds and drives the original 10 at a driving speed slightly faster than the driving speed of the paper feed roller 12 in order to prevent the original 10 from sagging during feeding.

Loading means are disposed at two symmetrically distributed locations on both sides of the document 10 in the feeding path between the paper feed roller 12 (!: the reading roller 16). Each of the load means 20, 20 is constituted by a fixedly installed pressing table n and a pressing film piece that constantly presses the pressing table η.

When the original 10 fed from the paper feed row 212 passes between the pressing table B and the pressing film piece C applied by the load means, the feeding force of the original 10 is smaller than the feeding force of the original 10. The load is received in the opposite direction.

The operation of the document feeding device configured as described above will be described below.

1 and 2, first, originals 10 set on a document table (not shown) are separated and fed one by one by a feeding roller 12 and a separator 14. The fed document 10 is delivered to a reading section of an image sensor 18 by a reading roller 16. This is υ, manuscript 1
Take out the 0's one by one and replace them.

The image is read in the main scanning direction X while being sent in the scanning direction 'IUY'.

Here, as shown in FIG. 1, when the document 10 is set in a bent state and is fed by the paper feed row 212, the leading edge of the document 10 being fed is bent by two load means. It comes into contact with either one of 20 and 20 first. Then, due to the load applied to the document 10 in the opposite direction from the load means that came into contact with it first, the load means that came into contact with it first is applied to the document 10, as shown by the arrow (E). With the addition as a fulcrum, a bending moment is generated to correct the bending of the document 10.

As described above, while the document 10 is being fed from the paper feeding roller 12 to the reading roller 16, the document 10 is subjected to a rotational moment in a direction that corrects the bending due to the application of the load means. Thereby, the document 10 can always be sent to the reading unit from the proper direction and read correctly. Such a correction effect occurs even when the original 10 is bent in any direction by disposing the plurality of loading means 20 on both sides of the original 10.

In the above embodiment, the load means are arranged at two places, but they may be arranged at more than two places. Further, the pressing means can also be constructed using an actuator such as that used in, for example, υ Mitsu 81 inch or Micro Sinch.

Effects of the Invention As is clear from the above description, the present invention has advantages in that the present invention has advantages in that the paper feed roller separates and feeds the originals one by one, and the reading roller feeds the originals fed from the paper feeding roller to the reading section. By applying a load smaller than the feeding force of the original in the counter-feeding direction to at least two or more locations distributed on both sides of the original, the original set crooked can be fed. During feeding from the paper roller to the reading roller, the original is subjected to a rotational moment in a direction that corrects 9, so that the original is sent from the proper direction to the reading unit so that it can be read correctly. This has the effect that it is possible to

[Brief explanation of the drawing]

FIG. 1 is a front view showing a schematic configuration of a document feeding device according to an embodiment of the present invention, FIG. 2 is a side view showing a schematic configuration of the device, and FIG. 3 is a schematic diagram of a conventional document feeding device. A front view showing the configuration. 10... Original, 12... Paper feed roller, 12A...
Rotating shaft, 14...Separator, 16...Reading roller, 18...Image sensor (reading unit), application...Loading means, n...Press table, d...Press film piece.

Claims (1)

[Claims] A paper feed roller that feeds a document by being rotationally driven via a one-way clutch mechanism; a separator that discriminates the document by slidingly contacting the paper feed roller; and a separator that separates the document by slidingly contacting the paper feed roller. The document is fed to two or more locations distributed on both sides of the document between a reading roller that is fed out to the reading section at a drive speed that is slightly faster than the drive speed, the paper feeding roller, and the reading roller. A document feeding device comprising a load means for applying a load smaller than the force in a counter-feeding direction.