JPH0138098Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a document conveyance device, and more particularly, to a document conveyance device incorporated in an automatic document separation device applied to a facsimile machine or the like.

(Prior Art) Some document conveyance devices incorporated in automatic document separation devices are capable of continuously feeding a plurality of sheet documents.

As shown in FIG. 1, such a document conveying device includes a document feeding roller 2 provided at the exit of a document stacking section 1A, and a separating roller 3 that abuts the roller 2 across the document feeding path. , a feeding roller 4 and a discharging roller 5 are provided at the entrance and exit of the document scanning section 1B, respectively, in the document feeding direction (direction indicated by arrow A in the figure).

The operation of this document conveying device is as follows.

That is, during document feeding, the document feeding roller 2, separation roller 3, feeding roller 4, and ejection roller 5 each rotate in the direction of the arrow shown in the drawing, which corresponds to the feeding direction of the document.

The documents in the document stacking section 1A are moved by the action of a feed roller 2 that rotates in a direction corresponding to the feeding direction (direction indicated by arrow A in the figure) and a separation roller 3 that rotates in the opposite direction. Only the document on the side of the feeding roller 2 is fed out from the document stacking section 1A, and then passed through the document scanning section 1B by the feeding roller 4 and the discharge roller 5.

While the document passes through the document scanning section 1B, the contents of the document are read by a reading scanning means 8 including an illumination lamp 6 and a photoelectric conversion element 7 provided in the scanning section 1B.

In addition, in the figure, symbols 4A and 5A indicate driven rollers of the feed roller 4 and the discharge roller 5, respectively.

By the way, when a document is intermittently fed to the document scanning section, it is necessary to intermittently feed the document from the document stacking section. It was necessary to perform drive control to vary the timing of rotation.

In other words, while the preceding document is fed by the feed roller and the discharge roller, it is necessary to maintain the document feeding roller in a stopped state so as not to feed out the subsequent document.

However, in conventional devices of this type, as shown in Japanese Patent Application Laid-open No. 53-38919 and Japanese Patent Publication No. 58-2145, rotation control of the feed roller and ejection roller in the document scanning section is difficult. However, it has not been realized that the rotation of the roller of the document feeding section can also be controlled by the single motor described above.

Therefore, as an example of controlling the rotation of the roller in the document feeding section, a motor is provided separately from that for the roller in the document scanning section, and the rotation is transmitted from this motor to the document feeding roller using a clutch provided between the two. There is only one that performs continuous control using a mechanism, and as a result, such an apparatus has the disadvantage that the structure of the document conveying apparatus is complicated.

(Purpose) This invention was made in view of the above, and
The purpose is to eliminate the above drawbacks,
It is possible to control the rotation of the feed and discharge rollers of the document scanning section as well as the rotation of the rollers of the document feeding section using a single drive source.

(Structure) The present invention rotates the document feed roller, feed roller, and discharge roller in the same direction, that is, in the rotation direction corresponding to the document feeding direction, when the single drive source rotates in the normal direction. The present invention is characterized in that, when the driving source is reversed when the preceding original is fed to the original scanning unit, the feeding roller and ejection roller of the original scanning unit are rotated in the same direction. .

The present invention will be described below with reference to the illustrated embodiments.

In addition, in the drawings after FIG. 2, the same members as those shown in FIG. 1 are designated by the same symbols.

FIG. 2 shows the main parts of the embodiment of the present invention.

In the figure, the support shaft 4a of the feeding roller 4 has
A first gear 10 as a first transmission body and a second gear 11 as a second transmission body are respectively attached.

The first gear 10 and the second gear 11 are mounted on a support shaft 4a via one-way clutches 10a and 11a (see FIG. 3) provided on each side, respectively.
The one-way clutches 10a, 11a are configured to transmit the rotation to the spindle 4a when the first and second gears 10, 11 rotate counterclockwise in the figure with respect to the spindle 4a. .

The above-mentioned counterclockwise direction is set in such a direction that the rotating direction of the feeding roller 4 coincides with the direction corresponding to the feeding direction of the document S (direction indicated by arrow A in FIG. 1).

A pulley 12, which is a transmission section from a drive source, is integrally attached to the first gear 10.

On the other hand, as a driving source, a stepping motor 13 capable of forward and reverse rotation is employed, and a pulley 14 is attached to this support shaft 13a.

A belt 15 is hung between the pulley 12 on the first gear 10 side and the pulley 14 on the drive source side, and the rotation of the stepping motor 13 is caused by the rotation of the stepping motor 13.
5 to the first gear 10.

A third gear 16, which is a third transmission body, meshes with the first gear 10. It is mounted via a one-way clutch 16a (see FIG. 3) that transmits only rotation to the support shaft 2a.

A first intermediate gear 17, which is a first intermediate transmission body, meshes with the second gear 11, and a second intermediate gear 18, which is a second intermediate transmission body, meshes with the first intermediate gear 17 and the first gear 10. are interlocking with each other.

On the other hand, a pulley 19 is attached to the support shaft 4a of the feed roller 4.
However, there is also a pulley 2 on the spindle 5a of the discharge roller 5.
0 are provided respectively, and by winding the belt 21 between these pulleys, the feeding roller 4
and the discharge roller 5 are arranged to move in the same direction.

Further, on the document entrance side of the document scanning section 1B, a document detection means 22 consisting of a light emitting element 22a and a light receiving element 22b for detecting the leading edge of the document fed to the scanning section 1B is provided. .

The document detecting means 22 is electrically connected to the stepping motor 13, and is configured to switch the direction of rotation of the stepping motor 13 when the leading edge of the document is detected.

In the document conveying device configured as described above, when the stepping motor 13 rotates clockwise in FIG. 2, the pulley 12 and the first gear 10 integrated therewith rotate clockwise via the belt 15. move. At this time, the one-way clutch 10a of the first gear 10 is in a state of not transmitting the rotation to the feeding roller 4 because the rotation direction of the first gear 10 is clockwise.

On the other hand, the third gear 16 rotates counterclockwise in conjunction with the first gear 10, and the second gear 11 rotates in a counterclockwise direction in conjunction with the first gear 10. Since the intermediate gear 17 rotates counterclockwise, the document feeding roller 2 and the feeding roller 4 rotate counterclockwise via the one-way clutches 16a and 11a in the third gear 16 and the second gear 11. Rotate.

In conjunction with the rotation of the feed roller 4, the discharge roller 5 also rotates counterclockwise via the belt 21.

In this state, the original is fed out from the original stacking section 1A and passes through the original scanning section 1B.

When the leading edge of the document is detected by the document detecting means 22, the rotating direction of the stepping motor 13 is switched to the opposite direction.

When the stepping motor 13 rotates counterclockwise in FIG.
Gear 10 rotates counterclockwise.

When the first gear 10 rotates counterclockwise, the feed roller 4 rotates counterclockwise via the one-way clutch 10a built therein, causing the same rotation as when the motor rotates forward as described above. The position will be maintained.

Further, the second gear 11 rotates clockwise via the second intermediate gear 18 and the first intermediate gear 17, but this rotation is caused by a one-way clutch 11a within the second gear 11. I can't tell it to roller 4.

Therefore, in conjunction with the counterclockwise rotation of the feed roller 4, the discharge roller 5 is also maintained to rotate counterclockwise via the belt 21.

On the other hand, the third gear 16 rotates clockwise by being driven by the first gear 10, but this rotation is caused by a one-way clutch 16a built in the third gear 16, which feeds out the document. It is not transmitted to roller 2.

Therefore, the document feeding roller 2 is rotated by the third gear 1.
It is maintained in a state in which it cannot be rotated from zero, and rotates as the document being fed by the feeding roller 4 moves.

The document feeding roller 2 stops co-rotating when the trailing edge of the document leaves the roller 2, thereby blocking the leading edge of the subsequent document.

Note that when feeding multiple originals continuously without interruption, the stepping motor is turned off after the leading edge of the original is detected by the original detection means until the leading edge of the subsequent original reaches the feeding roller 4. The rotation of the document feeding roller 2 may be maintained by controlling the number of steps of the motor so as to rotate the document.

(Effects) According to the present invention, a single motor that controls the rotation of the feed roller and ejection roller used for feeding the document in the document scanning section also controls the rotation of the roller for feeding the document. Therefore, it is possible to simplify the rotation control mechanism for each roller between the document feeding section and the document discharging section.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of a document conveying device applied to a document separation mechanism, FIG. 2 is a schematic perspective view showing main parts of an embodiment of the present invention, and FIG. 3 is a
-P arrow sectional view, FIG. 4 is a schematic view showing the operation of the embodiment of the present invention. 2... Original feeding roller, 4... Feeding roller, 4a... Support shaft, 5... Ejection roller, 10...
First transmission body, 11...Second transmission body, 12...Pulley, 13...Drive source, 15...Belt, 16...
Third transmission body, 17... First intermediate transmission body, 18...
Second intermediate transmission body, 10a, 11a, 16a... one-way clutch.

Claims (1)

[Scope of Claim for Utility Model Registration] In a document feeding device that feeds a document from a document stacking section to a document scanning section, a rotatable document feeding roller provided in a document feeding path at the exit of the document stacking section; a rotatable feeding roller and a discharging roller provided in the document feeding path at the entrance and exit of the document scanning section in the document feeding direction; a drive source that is rotatable in forward and reverse directions and can be stepped; a first transmission body having a one-way clutch that is provided via a transmission unit that can be interlocked with the drive source and transmits rotational motion in the document feeding direction to the paper feed roller; a second transmission body, which is provided coaxially with the first transmission body and has a clutch having the same function as the one-way clutch, and is capable of being engaged with and driven by the first transmission body;
a third power transmission body having a one-way clutch that transmits rotation in the feeding direction of the document to the document feeding roller; a first rotatable intermediate power transmission body that engages with the second transmission body; a second intermediate transmission body that engages with the first transmission body and the first intermediate transmission body; and a second intermediate transmission body that is provided between the feeding roller and the discharge roller and rotates both of the rollers in the same direction. interlocking means, when the drive source rotates normally, the second intermediate transmission body engages with the first transmission body and the second intermediate transmission body engages with the second intermediate transmission body. Rotate the
A one-way clutch provided thereon controls the feed roller, a one-way clutch of a third gear engaging the first gear causes the document feeding roller, and the interlocking means connects the ejection roller. When the drive source is in reverse rotation, the feeding roller is rotated through the one-way clutch of the first transmission body, and the feeding roller is ejected through the interlocking means. Each roller is rotated in the rotation direction corresponding to the document feeding direction,
The document conveying device is configured such that rotation of the document feeding roller is disabled through the one-way clutch of the third transmission member.