JP3750266B2 - Document feeding device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a document feeding device that feeds a document.
[0002]
[Prior art]
In recent years, image reading apparatuses have been widely used to read images from documents. In many cases, the image reading apparatus is provided with a document feeding device for automatically feeding a document to the image reading apparatus. The manuscripts are not only one piece at a time, but also double-leaf paper. Bileaf paper is a slip or the like formed by binding the upper sides of a plurality of sheets with glue or the like. Then, using the document feeding device, the bi-leaf paper is fed to the manuscript reading device, and the uppermost surface of the bi-leaf paper is read.
[0003]
Next, referring to FIGS. 2 and 3, a conventional document feeding device corresponding to the feeding of bileaf paper will be described. As shown in FIG. 2, the document 1 is fed in the conveyance direction N in contact with the paper feed roller 2 that rotates in the direction of the arrow M1. On the downstream side in the conveyance direction N of the paper feed roller 2, there is a pair of a separation roller 3 and a retard roller 4, and the separation roller 3 rotates in the direction of arrow M <b> 2 and sends the document 1 in the conveyance direction N. The retard roller 4 paired therewith is normally (in the case of separate documents one by one) and rotates in the direction of the solid line in the direction of arrow M3 (in the direction returning to the direction opposite to the conveyance direction N). Only the one on the upper stage is allowed to pass, and the others are moved back in the direction opposite to the conveyance direction N.
[0004]
However, when the double-leaf paper is fed out, if the retard roller 4 is operated as usual, a shift movement occurs between the leaves constituting the double-leaf paper, causing troubles such as breakage of the binding margin and bending. Therefore, when feeding out the double-leaf paper, the lever 5 is swung in the direction of the arrow N2 around the shaft support 6, and the retard roller 4 is supported at the tip of the lever 5 and supported by the rotation center 7a. The part 7 is pushed down in the direction of the arrow N3 so that the separation roller 3 and the retard roller 4 are separated from each other. As a result, the retard roller 4 does not come into contact with the double-leaf paper (original 1), thereby avoiding the above trouble.
[0005]
In addition, as shown in FIG. 3, the separation gear 9 is fixed to the end of the drive shaft 8 on which the separation roller 3 is pivotally attached, and the retard gear 11 is attached to the end of the retard shaft 12 on which the retard roller 4 is pivotally attached. There is also an example in which the separation gear 9 and the retard gear 11 are coupled by an idler 10 while being fixed. In this example, the idler 10 is normally pressed against the separation gear 9 and the retard gear 11 by the tip of the pressing lever 13 that swings about the shaft support portion 14 (in the case of separate documents one by one). The gear 9 and the retard gear 11 are connected. When the double-sheet paper document 1 is fed out, the tip of the pressing lever 13 is raised in the direction of the arrow N5 so that the idler 10 is removed from the separation gear 9 and the retard gear 11 so that no rotational force is transmitted to the retard gear 11. It was. By doing so, the retard roller 4 is made free, and the retard roller 4 is rotated around the separation roller 3 to avoid the above trouble.
[0006]
[Problems to be solved by the invention]
However, in any of the above-described conventional techniques, the case of separate originals and the case of bi-leaf papers depend on the mechanical operation using mechanical switching means such as the lever 5 and the pressing lever 13. And switched. In this case, an arrangement space only for the mechanical switching means is required, and it is difficult to provide in the document reading apparatus, and the mechanical operation is likely to be incomplete, and the double-leaf paper tends to be damaged. There was a problem.
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to provide a document feeding device that can supply bi-leaf paper without damaging it.
[0008]
[Means for Solving the Problems]
The document feeding device according to the present invention includes a driving source that generates rotational force in both forward and reverse directions, a paper feed roller that feeds the document in the transport direction, and a downstream side of the paper feed roller in the transport direction. A separation roller that feeds, a retard roller that is arranged so as to be paired with the separation roller and returns a document not on the uppermost stage in a direction opposite to the conveyance direction, and a rotational force of the driving source that supplies the feeding roller and the separation roller And a transmission mechanism for transmitting to the retard roller,
The transmission mechanism rotates the paper feed roller and the separation roller in a direction of feeding the document in the transport direction by the forward rotational force of the driving source when the document is not a bi-leaf paper, and the retard roller is moved to the document. When the original is a double-leaf paper, the paper feeding roller, the separation roller, and the retard roller are moved in the direction in which the original is fed by the reverse rotational force of the drive source. It is rotated in the direction to send to.
[0009]
Further, the transmission mechanism rotates the feed roller and the separation roller in the direction of feeding the document in the transport direction when the rotational force of the drive source is in the forward direction, and returns the retard roller to the direction opposite to the transport direction. When the rotational force of the drive source is in the opposite direction, the paper feed roller and the separation roller are rotated in the direction of feeding the document in the transport direction, and the drive force to the retard roller is interrupted.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The document feeding device according to claim 1 is a drive source that generates rotational force in both forward and reverse directions, a feed roller that feeds the document in the transport direction, and a document that is positioned downstream of the feed roller in the transport direction and transports the document. A separation roller that feeds in a direction, a retard roller that is arranged to make a pair with the separation roller and returns a document that is not on the uppermost stage in a direction opposite to the conveyance direction, and a rotational force of the driving source that feeds the feeding roller, A separation roller and a transmission mechanism for transmitting to the retard roller,
The transmission mechanism rotates the paper feed roller and the separation roller in a direction of feeding the document in the transport direction by the forward rotational force of the driving source when the document is not a bi-leaf paper, and the retard roller is moved to the document. When the original is a double-leaf paper, the paper feeding roller, the separation roller, and the retard roller are moved in the direction in which the original is fed by the reverse rotational force of the drive source. It is rotated in the direction to send to. With this configuration, when feeding a bi-leaf paper document, the retard roller can be rotated in the direction of rotating with the separation roller only by switching the direction of the rotational force of the drive source, and the bi-leaf paper can be damaged. Trouble can be avoided.
[0011]
The document feeding device according to claim 2 is a drive source that generates rotational forces in both forward and reverse directions, a paper feed roller that feeds the document in the transport direction, and a document feed direction that is located downstream of the paper feed roller in the transport direction. A separation roller to be fed to the separation roller, a retard roller that is arranged so as to be paired with the separation roller and returns a document that is not on the uppermost stage in the reverse direction of the conveyance direction, and a rotational force of the driving source to feed the feed roller, the separation roller, and the retard roller The transmission mechanism rotates the paper feed roller and the separation roller in the direction of feeding the original in the conveyance direction and the retard roller conveys the original when the rotational force of the driving source is in the positive direction. When the rotational force of the drive source is in the reverse direction, rotate the paper feed roller and separation roller in the direction to feed the document in the transport direction, and cut off the drive force to the retard roller. To do. With this configuration, when feeding a bi-leaf paper document, the retard roller can be made free and swung around the separation roller only by switching the direction of the rotational force of the drive source. Can be avoided.
[0012]
Next, embodiments of the present invention will be described with reference to the drawings. Here, FIG. 1 is a perspective view of a document feeding device according to an embodiment of the present invention. As shown in FIG. 1, the document feeding device includes a paper feed motor 18 as a drive source that generates rotational force in both forward and reverse directions, a control unit C that controls the direction of rotational force of the paper feed motor 18, and a document. Is disposed so as to be paired with the separation roller 16 and a separation roller 16 that is positioned downstream of the sheet feeding roller 15 in the conveyance direction N and that feeds a document in the conveyance direction N. The original not on the uppermost stage is returned in the direction opposite to the conveyance direction N, and the rotational force of the retard roller 17 incorporating the torque limiter 17 a and the paper feed motor 18 is applied to the paper feed roller 15, the separation roller 16, and the retard roller 17. And a transmission mechanism 20 for transmission.
[0013]
Next, details of the transmission mechanism 20 will be described. Reference numeral 19 denotes an output shaft of the paper feed motor 18. The motor gear 21 mounted on the output shaft 19 rotates in the same direction as the rotation direction of the output shaft 19 (the solid line arrow indicates normal rotation and the broken line arrow indicates reverse rotation). A first gear 22 meshes with the motor gear 21, and the first gear 22 is pivotally attached to a first shaft 23 that is rotatably supported by a frame 24.
[0014]
Further, a second gear 25 is pivotally attached to a position away from the first gear 22 in the first shaft 23. The first gear 22 is engaged with two gears, a fourth gear 28 and a fifth gear 29. Further, the fifth gear 29 meshes with the sixth gear 30.
[0015]
The fourth gear 28 and the sixth gear 30 are pivotally supported by the same relay shaft 31. However, the fourth gear 28 and the sixth gear 30 have built-in one-way clutches 32 and 33, respectively. In the relay shaft 31, when the output shaft 19 rotates in the forward direction, the sixth gear 30 is idled by the one-way clutch 33, and the rotational force of the first gear 22 is transmitted via the fourth gear 28, and the direction of the arrow M4 Rotate to. Further, in the relay shaft 31, when the output shaft 19 rotates in the reverse direction, the fourth gear 28 is idled by the one-way clutch 32, and the rotational force of the first gear 22 is transmitted via the fifth gear 29 and the sixth gear 30. , Rotate in the direction of arrow M4. In other words, the relay shaft 31 rotates in the direction of the arrow M4 regardless of whether the output shaft 19 rotates in the forward or reverse direction.
[0016]
Further, the relay shaft 31 is connected to the separation shaft 34 that holds the separation roller 16 by pulleys 35 and 36 and a belt 37. The separation roller 16 together with the relay shaft 31 depends on the rotation direction of the output shaft 19. Regardless, the document rotates in the conveyance direction N. Similarly, the paper feed shaft 38 that holds the paper feed roller 15 is connected to the separation shaft 34 by pulleys 39 and 40 and a belt 41. The paper feed roller 15 and the separation roller 16 rotate the output shaft 19. Regardless of the direction, the document is rotated so as to be fed in the conveyance direction N.
[0017]
The second gear 25 meshes with the third gear 26 that is pivotally attached to the end of the retard shaft 27, and the retard roller 17 is held on the retard shaft 27. Accordingly, the retard roller 17 rotates in a direction to return the document in the direction opposite to the conveyance direction N when the output shaft 19 rotates forward, and rotates in a direction to send the document in the conveyance direction N when the output shaft 19 reverses.
[0018]
Next, the operation of the document feeding device of this embodiment will be described. First, when feeding a normal document that is not bi-leaf paper, the controller C sets the rotation direction of the paper feed motor 18 to normal rotation. Therefore, the paper feed roller 15 and the separation roller 16 rotate so as to send the document in the transport direction N, and the retard roller 17 rotates so as to return the document in the direction opposite to the transport direction N.
[0019]
On the other hand, when feeding a bileaf original, the control unit C sets the rotation direction of the paper feed motor 18 to reverse. For this reason, the paper feed roller 15, the separation roller 16, and the retard roller 17 rotate so as to feed the document in the conveyance direction N, and troubles such as breakage of the bileaf paper are avoided. Here, in order to cope with double-leaf paper, it is only necessary to switch the rotation direction of the paper feed motor 18, and it is not necessary to add a mechanical mechanism only for that purpose. For this reason, the arrangement space for a mechanical mechanism is unnecessary, and it can respond to a double-leaf paper reliably by electrical switching.
[0020]
In order to release the drive of the retard roller 17 when feeding the double-leaf paper, for example, a one-way clutch that transmits only the rotation in the direction of the solid arrow is provided between the retard shaft 27 and the third gear 26. That's fine.
[0021]
【The invention's effect】
According to the present invention, it is possible to reliably feed the bileaf paper without causing trouble, and no special arrangement space is required for accommodating the bileaf paper.
[Brief description of the drawings]
FIG. 1 is a perspective view of a document feeding device according to an embodiment of the present invention. FIG. 2 is a sectional view of a conventional document feeding device. FIG. 3 is a perspective view of a conventional document feeding device.
15 Feed roller 16 Separation roller 17 Retard roller 18 Feed motor 20 Transmission mechanism

Claims (2)

A driving source that generates rotational force in both forward and reverse directions, a paper feed roller that feeds a document in the transport direction, a separation roller that is located downstream of the paper feed roller in the transport direction and sends a document in the transport direction, and the separation roller A retard roller arranged in a pair with respect to the original and returning a document not on the uppermost stage in the reverse direction of the conveyance direction, and a transmission for transmitting the rotational force of the drive source to the paper feed roller, the separation roller, and the retard roller With a mechanism,
The transmission mechanism rotates the paper feed roller and the separation roller in a direction of feeding the document in the transport direction by the forward rotational force of the driving source when the document is not a bi-leaf paper, and the retard roller is moved to the document. When the original is a double-leaf paper, the paper feeding roller, the separation roller, and the retard roller are moved in the direction in which the original is fed by the reverse rotational force of the drive source. A document feeding device, wherein the document feeding device is rotated in the direction of feeding to the document. A driving source that generates rotational force in both forward and reverse directions, a paper feed roller that feeds a document in the transport direction, a separation roller that is located downstream of the paper feed roller in the transport direction and sends a document in the transport direction, and the separation roller A retard roller arranged in a pair with respect to the original and returning a document not on the uppermost stage in the reverse direction of the conveyance direction, and a transmission for transmitting the rotational force of the drive source to the paper feed roller, the separation roller, and the retard roller With a mechanism,
The transmission mechanism rotates the paper feed roller and the separation roller in a direction to feed the document in the transport direction when the rotational force of the driving source is in the forward direction, and the retard roller rotates in the direction opposite to the document transport direction. When the rotational force of the drive source is in the reverse direction, the feed roller and the separation roller are rotated in the direction of feeding the document in the transport direction, and the drive force to the retard roller is cut off. A document feeding device characterized in that:

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