JPS63117823A - Automatic paper feeding device - Google Patents

Abstract

PURPOSE:To make it possible to prevent an oblique sheet feeding or a sheet clogging, by moving a pair of original guides furnishing with plural sensors to detect the contact to an original, symmetrically to the center line of an original table. CONSTITUTION:When an original 11 is loaded on an original table 12, a motor 17 is rotated to move original guides 14 and 14 to the center line side of the original table 12, and the original guides 14 and 14 hold the both ends of the original 11 in the condition vertical to a sheet feeding roller 13, while setting the original at the central position of the original table 12. In this case, although a pressure sensor 18 responding to the angles 11a and 11b of the original 11, of the plural pressure sensors 18 installed at the original guides 14 and 14, is contacted to the original, the motor 17 continues to rotate, but when at least two or more pressure sensors of them are contacted to the original, the motor stops. Then a conveyer roller 20 is rotated by a motor 21, and the original 11 is delivered to the sheet feeding rollers 13. In such a way, an accurate automatic paper feeding can be carried out, and an oblique paper feeding or a paper clogging can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an automatic paper feeder used in facsimiles, copying machines, and the like.

2. Description of the Related Art As shown in FIG. 4, this type of apparatus has a document table 1 on which a document is placed, a document guide 2 that is movable symmetrically with respect to the center line of the document table 1, and a document guide 2 that is movable symmetrically with respect to the center line of the document table 1. In order to start feeding the document 4, place the document 4 on the document table 1 and manually adjust the document guide 2 according to the document 4. A method has been used in which the leading edge of the original 4 is made parallel to the feeding roller 3 by sliding the original 4, and the leading edge of the original 4 is brought into contact with the feeding roller 3. Note that 5 in the figure is a paper feed roller drive motor.

Problems to be Solved by the Invention However, with this configuration, there is a problem in that the document guide must be placed in position according to each document.

The above problem arises for the following reasons. In other words, if you neglect to set the document guide, there is a risk that the document will be set diagonally, and any damage may cause diagonal feeding or paper jams.

The present invention has been made in view of the above-mentioned problems, and it is possible to bring the document into a paper feed start state by hitting the document parallel to the paper feed roller without adjusting the document guide to the document one by one. The purpose is to provide an automatically fed 3-page paper format.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a drive for moving a pair of document guides that guide the side edges of the document on the document table symmetrically with respect to the center line of the document table. In addition to providing equipment,
The document contacting surface of each document guide is provided with a plurality of sensors for detecting contact with the document, and is further provided with a conveying means for conveying the document placed on the document table toward the paper feed roller. It is.

According to the above-described structure, when a document is properly placed at the seven-edge position on the document table, the document guides first move toward each other and push the side edges of the document to correct the posture of the document. The leading edge of the paper feed can be made parallel to the paper feed roller, and when the orientation of the document is correctly corrected by the document guides, the document will be placed on at least two sensors of each document guide located on both sides of the document. Since the two sensors make contact with each other, the completion of the document posture correction operation can be detected by the detection signals from two sensors on each side, and the movement of the document guide is stopped.Then, the document is conveyed by the conveying means until it hits the paper feed roller. This eliminates the need to manually set the document guide to match the document each time as in the past, and also prevents slanted paper feeding or paper feeding caused by poor document placement. Problems such as clogging can also be resolved.

Example Hereinafter, the present invention will be described in detail as shown in the drawings.

FIG. 1 is a plan view showing a schematic configuration of an automatic paper feeder according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line II--H in FIG. In the figure, 11 is a document, 12 is a document table on which the document 11 is placed, 13 is a paper feed roller arranged at one end of the document table 12 and feeds out the document 11 on the document table 12, and 14 is a document 11 on the document table 12. A pair of document guides that guide the side edges of the paper feed roller 13 extend perpendicularly to the axis of the paper feed roller 13 and are movable in parallel to the axis of the paper feed roller 13.

As shown in FIG. 3, the pair of document guides 14 include
A drive device consisting of a rack gear 15, a guide gear 16, and a drive motor 17 arranged on the back side of the document table 12 is connected.
The document table 12 is configured to move symmetrically with respect to the center line of the document table 12 by rotation of the drive motor 17 .

In FIGS. 1 and 2, reference numeral 18 denotes a plurality of pressure sensitive sensors attached to the document contacting surface of each document guide 14, which outputs detection signals by contacting the side edges of the document with appropriate pressure. A plurality of transport rollers provided on the document table 12 are partially protruded from the surface of the document table 12, and the rollers are provided on the document table 12.
The structure is such that the document 11 placed on the paper can be transported. 21 is a motor that drives the paper feed roller 13 and the conveyance roller 20; 22;
．． Numerals 23 and 24 are gears that transmit the rotation of the motor 21 to the paper feed roller 13 and the conveyance roller. Appropriate latches ( (not shown) are arranged. 5 is a gear attached to each conveyance roller, and 26 is an idle gear that connects the gear 5. All the conveyance rollers are rotated in the same direction by this gear 5.26. Reference numeral 27 denotes a paper passage sensor that detects passage of the leading edge of the original 11. Although not shown in FIG. 6, the pressure sensor 18 and the paper passage sensor 2
A control device is provided that controls each motor 17, 21, clutch, etc. by signals such as 7 and the like. This control device automatically performs the operations described below, and its circuit configuration can be easily designed, so a description thereof will be omitted.

Next, the operation of the automatic paper feeder having the above configuration will be explained.

Normally, a pair of document guides 14 are in an open state, and the document 11 is placed on the document table 12 between the document guides 14. At this time, the document 11 may be in an inclined state as shown in FIG. When a document 11 is placed on the document table 12, the motor 17 rotates, and as the guide gear 16 rotates, the rack gear 15 moves in the direction of the arrow in FIG.
4 moves in the direction of the arrow in FIG. 1
1 at the center of the document table 12. During this operation, a plurality of pressure sensors 1 attached to each document guide 14
8, the corner 11 of the original 7 Beno manuscript 11. Pressure sensitive sensor 1 facing a, llb
8, the side edge of the original 11 first makes contact and outputs a detection signal, but at this point, the original 11 is not yet set in the correct posture and position, so the rotation of the motor 17 does not stop.
The document guide 14 continues to move in the direction of the arrow.

When the document 11 is corrected to the correct posture by the document guides 14 on both sides and set in the center, the side edges of the document 11 on both sides come into contact with the plurality of pressure sensors 18 of each document guide 4. , the point in time when detection signals from at least two pressure-sensitive sensors 18 of the pressure-sensitive sensors 18 of each document guide 14 are generated is the end of cent of the document, and at this point the rotation of the motor 17 stops, and then , motor 17
rotate slightly in the opposite direction, and widen the document guide [4] from the guide position by about 1 to 2 wn.

Next, the transport roller is rotated by the motor 21 to transport the document 11 toward the paper feed roller 13 . At this time, as described above, the document guide 14 is spread out by about 1 to 2 mm from the guide position, so the document 11 is conveyed smoothly.
In addition, even if the document is placed on the document table 12 at an angle, it is straightened by the document guide 14, so when the document is conveyed by the conveyance rollers, it will not be conveyed at an angle, and the document will not be conveyed diagonally. The leading edge of the original is set parallel to the original.

The conveyance roller 20 stops after an appropriate period of time has elapsed after the document 11 passes the paper passage sensor 27 . This appropriate time is the time when the document 11 hits the paper feed roller 13.

When the original 11 hits the paper feed roller 13 and stops,
The motor 17 for moving the document guide 14 rotates again to move the document guide 14 in the direction of the arrow, and stops with the document 11 being guided to the extent that it does not bend. This completes the paper setting.

Note that in the above operation, the document guide 14
After fixing the orientation of the document and setting it at the center of the document table, the document is spread out a little before being conveyed toward the paper feed roller 13. This may occur if there are irregularities on the side of the document, etc. This is taken into consideration. In addition, after the original 11 hits the paper feed roller 13, the original guide 14 is returned to the position that matches the original, but this is to prevent slight bending of the paper due to machine variations, etc. be. Of course, in the case of automatic paper feeding where these operations are not necessary, they may be omitted.

In the above embodiment, the pressure sensor 18 is used as a guide for each document]
The effect of attaching a plurality of pressure sensors to the paper feed roller 4 is that it is possible to easily detect the state in which the document 11 is straight with respect to the paper feed roller as described above. It can also be used to detect meandering of a document during conveyance. That is, if the document does not come into contact with the pressure-sensitive sensor when conveying the document, the document may be meandering, and in this case, the document guide 14 will automatically open and close. , it is also possible to configure the document to correct meandering of the document.

Further, in the above embodiment, a rack gear is used to move the document guide 14, but the structure is not limited to this.

Further, although a conveyance roller is used as a means for conveying the document on the document table, a belt or the like may be used instead.

Effects of the Invention As is clear from the above description, the present invention includes a driving device that moves a pair of document guides that guide the side edges of a document on a 10-page document table symmetrically with respect to the center line of the document table. A plurality of sensors for detecting contact with the document are provided on the document contact surface of each document guide, and a conveying means is further provided for conveying the document placed on the document table toward the paper feed roller. With this system, a document placed appropriately on the document table is sandwiched between a pair of document guides that are moved toward each other by a drive device, and the document is placed straight against the paper feed roller, that is, the leading edge of the document is fed. When the orientation and position of the document are correctly corrected by the document guides, detection signals are generated from at least two sensors of each document guide located on both sides of the document. Therefore, based on this signal, the movement of the document guide is stopped to prevent the document from sagging, and then the document is conveyed by the conveying means until it hits the paper feed roller, and the paper feed can be started. , there is no need to manually set the document guides each time according to the document as in the past, and there are no problems such as slanted paper feeding or paper jams caused by poor document placement. This has the effect of allowing automatic paper feeding.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a schematic configuration of an automatic paper feeder according to an embodiment of the present invention, FIG.
The figure is a cross-sectional view showing the driving mechanism of the document guide in the above-mentioned apparatus, and FIG. 4 is a schematic plan view of a conventional automatic paper feeder.

Claims (1)

[Claims] A document table on which a document is placed, a paper feed roller placed at one end of the document table to feed the document on the document table, a pair of document guides that guide the side edges of the document on the document table, and a pair of document guides. A drive device that moves the document table symmetrically with respect to the center line, a plurality of sensors that are attached to the document contact surface of each document guide to detect contact with the document, and a paper feed roller that moves the document placed on the document table. An automatic paper feeding device that has a conveying means for conveying toward.