JPH0585627A - Paper feeding device and image reading device - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the inclination angle of the sheet material mounting table and to downsize the sheet feeding device. [Structure] At a lower end 29A and a rear end 29B of a sheet material mounting table 29, a spring 30 interposed between the sheet material mounting table 29 and the facsimile main body 1, and an electromagnet 35 fixed to the facsimile main body 1. , A vibration generator 33 including an attracting iron plate 36 fixed to the lower surface of the sheet material mounting table 29.
Each of the vibration generators 33 is configured to apply vertical vibrations to the document table 29 when the document 3 is fed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device provided in a facsimile, a copying machine, a printer or the like.

[0002]

2. Description of the Related Art As a document feeding device for a facsimile, there is known a document feeding device in which a document placing table (sheet material placing table) is attached to a facsimile body (image reading apparatus body) in an inclined state.

In this document feeding device, a document (sheet material) placed on the document placing table is slid by utilizing the inclination of the document placing table and is fed to a document feeding section located downstream.

In general, the upper surface of the document placing table is provided with ribs, rollers and the like for improving the smoothness of the document so as to prevent defective feeding. The ribs and rollers reduce the frictional force between the upper surface of the document table and the document.

Further, there is also one in which a conveying roller for forcibly promoting the sliding of the original is provided on the original placing table.

[0006]

However, in the case of the above-described conventional document feeding device, the document placing table must be tilted at a large angle in order to surely slide the document, and therefore the document feeding device is required. Becomes larger in the vertical direction. When the original is stuck to the original placing table due to static electricity or the like, the original cannot be slid not only by the ribs and rollers but also by the conveying rollers, which causes a paper feed failure. Due to the inclination of the document placing table, when a plurality of sheets are set, the sheets slide down from the upper sheet or the middle sheet slides down, and the leading ends of the sheets become uneven.
For this reason, the upper side or the middle sheet is conveyed to the original conveying system and the conveyance order of the sheets is changed, or one sheet is
There is a problem that the sheets are not overlapped but are conveyed in an overlapping manner.

Therefore, the present invention has been made in view of the above circumstances, and the sheet material can be surely slid even when the inclination angle of the sheet material mounting table is small, and the sheet material is protected from static electricity or the like. An object of the present invention is to provide a sheet feeding device that can be peeled off and slid even if it is attached to a sheet material mounting table, and that the sheet front ends can be aligned when the sheet is set.

[0008]

For example, referring to FIG. 1, the present invention has a sheet material mounting table (29) attached to the image reading apparatus main body (1) in an inclined state. A sheet feeding device of a type in which a sheet material (3) placed on a sheet material placing table (29) is slid using the inclination of the sheet material placing table (29) and is fed to a downstream sheet material conveying section (6). Pertain to.

In order to achieve the above-mentioned object, the present invention allows the sheet material placing table (29) to be fed to the sheet material placing table (29) when feeding the sheet material (3) placed on the sheet material placing table (29). It is characterized by having a vibration generating means (33) for giving vibration.

Further, the image reading apparatus main body (1) has a sheet material mounting table (29) attached in an inclined state,
A sheet feeding method in which the sheet material (3) placed on the sheet material placing table (29) is slid by utilizing the inclination of the sheet material placing table (29) and sent to the downstream sheet material conveying section (6). In the apparatus (2), a vibration generating means for vibrating the sheet material placing table when feeding the sheet material placed on the sheet material placing table, and the sheet conveying section (6).
A sheet damming member (42) located upstream of the sheet damming member (3) for damming the sheet material (3), and a vertically moving means (43) for vertically moving the sheet damming member (42) from the sheet material conveying surface (46). It is characterized by having.

[0011]

According to the above construction, when the sheet material (3) is fed, the sheet material placing table (29) on which the sheet material (3) is placed is given from the vibration generating means (33). It vibrates due to vibration. Therefore, the sheet material (3) is sent to the downstream sheet material conveying section (6) by utilizing the inclination of the sheet material mounting table (29) by the action of the vibration. As a result, it is possible to prevent the sheet material (3) from sticking to the sheet mounting table (29) and the occurrence of sheet feeding failure due to the sticking. When the sheet material (3) is fed, the sheet damming member (42) is raised by the up-and-down means (43), and the sheet material mounting table (29) vibrates by the vibration given from the vibration generating means (33). Therefore, the sheet material mounting table (2
9) The sheet material (3) placed on the sheet material slides on the sheet material placing table (29) by the vibration of the sheet material placing table (29) and is stopped by the sheet damming member.

As a result, the leading ends of the sheet material (3) can be aligned. Further, when the sheet material (3) is fed, the sheet damming member is lowered by the up / down means, and the sheet material mounting table (29) is vibrated by the vibration given from the vibration generating means (33). Therefore, the sheet material mounting table (2
9) The sheet material (3) placed on the sheet material placing table (29) is deprived of the frictional force and the sticking force with the sheet material placing table (29) by the vibration of the sheet material placing table (29). Gliding through.

As a result, the sheet material (3) can be slid even if the inclination angle of the sheet material mounting table (29) is small.
In addition, the sheet material (3) is subjected to static electricity, etc.
Even if it is attached to 9), it can be peeled off and slid.

The reference numerals in parentheses are for reference to the drawings and do not limit the structure in any way.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

Here, the case where the present invention is applied to a document feeding device of a facsimile is shown. <Embodiment 1> FIG. 1 shows a facsimile equipped with a document feeder according to Embodiment 1 of the present invention.

First, the outline of this facsimile will be described.

The present facsimile is equipped with an original document feeding device 2 outside the facsimile main body 1, and an original document reading device 5 in the facsimile main body 1 for an original document (sheet material) 3 to be transmitted to a counterpart facsimile by the original document feeding device 2. To feed.

The original 3 fed from the original feeding device 2 is conveyed to the original reading device 5 by the original conveying device 6.

The document feeding device 6 includes a pair of separation rollers (retard roller pair) 7 for separating and feeding one document 3 when a plurality of documents 3 are fed from the document feeding device 2, and this pair of separation rollers. A pair of paper feed rollers 9 that conveys the original 3 sent by the sheet 7 onto an original platen glass 11 described later, and the original platen glass 1
1 is composed of a pair of paper discharge rollers 10 and the like for discharging the manuscript 3 of which the manuscript has been read out of the machine.

The document reading device 5 reads the document 3 conveyed by the document conveying device 6 and transmits an image signal to the facsimile of the other party.

The document reading device 5 includes a document table glass 11 as a document reading section, a light source 12 for irradiating the document table glass 11 with light, and a light L reflected from the document table glass 11.
Mirrors 13 and 15 for reflecting light, and a lens 1
6 and a photoelectric conversion element (CCD) 17 and the like.

Further, the facsimile body 1 is provided with an image information recording section (printer section) 19 for recording the image information received from the facsimile of the other party.

The image information recording section 19 includes a roll-shaped recording sheet 21 rotatably stored in the storage section 20, a platen roller 22 for pulling the recording sheet 21 out of the storage section 20, and a platen roller 22. Recording head 23 for recording (printing) the received image on the recording sheet 21
A cutter 25 for cutting the recording sheet 21 after image recording to a predetermined length, a pair of paper discharge rollers 27 for discharging the cut recording sheet 21 to a stacker 26 outside the machine, and the like.

The original document feeder 2 of the present invention is a plastic original document attached to the sheet stopper member 42 provided immediately before the separation roller pair 7 and the facsimile main body 1 in a gently inclined state (small inclination angle). It has a mounting table 29.

The seat damming member 42 includes a lifting mechanism 4
3 is provided. The up-and-down mechanism 43 includes an electromagnet 44 fixed above the sheet dam member 42.

The document table 29 is attached to the facsimile main body 1 via springs (coil springs) 30 and 31 arranged at the lower end 29A and the higher end 29B. In this case, the document platen. Lower end 2 of 29
9A is fitted in the paper feed port 32 of the facsimile main body 1.

The lower end 29A of the document table 29
A vibration generating mechanism 33 for applying vertical vibrations to the document table 29 is provided at the upper end 29B.

The vibration generating mechanism 33 is used for the facsimile main body 1
Side fixed to the electromagnet 35, and an attracting iron plate 36 fixed to the lower surface portion of the document table 29 facing the electromagnet 35.
And the spring 30.

Next, FIG. 2 shows a flowchart of the paper feeding operation including the document setting.

Before the original 3 is set on the original table 29, the up-and-down mechanism 43 raises the sheet damming member 42 by the drive circuit shown in FIG. 3 (S1). That is, manuscript 3
C, which is the control device for the entire facsimile before it is set
The PU 37 outputs a drive signal to the electromagnet driver 39. As a result, the electromagnet driver 39 energizes the electromagnet 44. As a result, the sheet damming member 42 is attracted to the electromagnet 44 and rises. After the document is set (S2), the vibration generating mechanism 33 applies vertical vibration to the document placing 29 by the drive circuit shown in FIG. 3 (S3), that is,
The CPU 37, which is a control device for the entire facsimile, outputs a drive signal to the electromagnet driver 39. Thus, the electromagnet driver 39 can repeatedly energize and deenergize the electromagnet 35. Therefore, the electromagnet 35 repeats the adsorption and non-adsorption operations on the adsorption iron plate 36 which is separated, and as a result, the attraction force of the electromagnet 35 and the repulsive force of the spring 30 act alternately on the document table 29. The document table 29 vibrates vertically.

As described above, when the original placing table 29 vibrates in the vertical direction by the vibration applied from the vibration generating mechanism 33, the original 3 placed on the original placing table 29 having a small inclination angle, or the original placed by static electricity or the like. The original 3 attached to the table 29 is deprived of the frictional force and the sticking force with the original table 29 due to the vibration, slides on the inclined original table 29, and is stopped by the sheet dam member 42. The tips are aligned.

When the document 3 is fed (S4), the up-and-down mechanism 43 lowers the sheet damming member 42 by the drive circuit shown in FIG. 3 (S5). That is, the CPU 37, which is a control device for the entire facsimile when the document 3 is fed, outputs a drive signal to the electromagnet driver 39. As a result, the electromagnet driver 39 does not pass the electromagnet 44. As a result, the sheet damming member 42 separates from the electromagnet 44 and descends. After that, the vibration generating mechanism 33 applies vertical vibration to the document table 29 by the drive circuit shown in FIG. 3 (S6).

As described above, when the original placing table 29 vibrates in the vertical direction by the vibration applied from the vibration generating mechanism 33, the original 3 placed on the original placing table 29 having a small inclination angle or the original placed by static electricity or the like. The original 3 attached to the table 29 is deprived of the frictional force and the sticking force with the original table 29 due to its vibration, and slides on the inclined original table 29.
Then, it is sent to the nip portion of the separation roller pair 7 via the paper feed port 32 of the facsimile main body 1.

In FIG. 4, the vibration generating mechanism 3 is mounted on the document table 29.
Original 3 with and without vibration from 3
The relationship between the document placing table 29 and the document placing table 29 is shown.

The original document 3 placed on the original document table 29 that is gently inclined is in a state where it does not slide due to the frictional force between the original document table 29 and the original document table 29 (FIG. 4 (a)). When the document table 29 vibrates in the direction of arrow A, the document table 29
The normal force between and is significantly dampened. Since the magnitude of the friction force is determined by the vertical force, when the vertical force decreases, the friction force also attenuates. Therefore, the original 3 slides in the direction of arrow B due to the inclination of the original table 29 (FIG. 4 (b)).

FIG. 5 shows the state of the leading edge of the document when the document 3 is set. When the original is set, the edges are not aligned (Fig. 5 (a)). When the document placing table 29 vibrates in this state, the document is indicated by the arrow B due to the relationship described with reference to FIG.
The sheet slides in the direction and is stopped by the sheet damming member 42 so that the leading ends are aligned (FIG. 5 (b)). Further, at the time of conveying the original, the upper end of the sheet damming member 42 descends below the sheet conveying surface 46 as shown in FIG. 5C, and the upper sheet 3 is conveyed to the separation roller pair. <Embodiment 2> FIG. 6 shows a facsimile equipped with a document feeder according to Embodiment 2 of the present invention.

In the present facsimile, the same members as those of the above-described first embodiment are designated by the same reference numerals, and the description of those which are functionally unchanged will be omitted.

In the document feeder 2 of this embodiment, the vibration generating mechanism 4 including the eccentric cam 40 and the springs 30 and 31 at the lower end 29A and the higher end 29B of the document table 29 is used.
1 is provided.

In the case of this vibration generating mechanism 41, the eccentric cam 4
When 0 is continuously rotated at a constant speed, the eccentric cam 40
As a result, the pushing force of 10 and the restoring force of the spring 30 alternately act on the document placing table 29, so that the document placing table 29 vibrates in the vertical direction.

In FIG. 7A, the eccentric cam 40 is attached to the document table 29.
7B shows the state in which the pushing force is applied, and FIG. 7B shows the state in which the restoring force of the spring 30 acts on the document table 29.

The eccentric cam 40 is used by the CPU when the document 3 is fed.
It is rotated by a motor (not shown) whose drive is controlled by 37.

In the first and second embodiments, the vibration generating mechanism 33 for vertically vibrating the document placing table 29,
Although the case where the document mounting table 41 is provided is shown, the same operation can be obtained even when the vibration generating mechanism for horizontally vibrating the document placing table 29 is provided.

Further, although the vibration generating mechanisms 33 and 41 of the first and second embodiments use the coil spring as the spring 30, they may be replaced by a leaf spring.

Further, the vertical mechanism 43 may be replaced with one using the cam used in the vibration generating mechanism 41.

Further, the present invention can be widely applied not only to the document feeder of the facsimile but also to, for example, the manual feeder of the copying machine or the feeder of the printer.

[0047]

As described above, in the sheet feeding device of the image reading apparatus of the present invention, the sheet material placing table is vibrated when the sheet material is fed, so that the inclination angle of the sheet material placing table is small. Even if the sheet material is stuck to the sheet material mounting table due to static electricity or the like, the sheet material can surely slide and be fed.

Therefore, the paper feeding device can be downsized. In addition, the reliability of sheet feeding does not deteriorate due to the material of the sheet material or the environment.

Further, in the case of the sheet feeding device of the present invention, it is not necessary to provide ribs or rollers for sliding the sheet material on the sheet material mounting table as in the conventional case, so that the shape of the sheet material mounting table is complicated. Also, the sheet material does not become dirty with ribs or the like.

Further, by aligning the leading ends of the sheets when setting the sheets, it is possible to greatly enhance the reliability of the sheet conveyance.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a facsimile equipped with a document feeding device according to a first embodiment of the present invention.

FIG. 2 is a flowchart related to the paper feeding operation.

FIG. 3 is a block diagram of a drive circuit that drives an electromagnet of a vibration generating mechanism for vibrating the top and bottom of a sheet damming member and the document placing table of the document feeding device.

FIG. 4 is a vertical cross-sectional side view showing the relationship between the document placing table when the document placing table is not vibrating and when the document placing table is vibrating.

FIG. 5 is an alignment operation diagram of a sheet front end by a sheet damming member.

FIG. 6 is a vertical sectional side view of a facsimile equipped with a document feeding device according to a second embodiment of the invention.

FIG. 7 is a vertical cross-sectional side view showing the operation of the vibration generating mechanism of the document feeding apparatus.

[Explanation of symbols]

 1 Facsimile Main Body (Image Reading Device Main Body) 2 Original Paper Feeding Device (Paper Feeding Device) 3 Original Document (Sheet Material) 5 Development Reading Device (Reading Device) 6 Original Document Conveying Device (Sheet Material Conveying Section) 29 Original Plate (Sheet Material) Placement table 33, 41 Vibration generating mechanism (vibration generating means) 42 Sheet damming member 43 Vertical moving means (vertical moving mechanism) 46 Sheet conveying surface

Claims (5)

[Claims] 1. A sheet material mounting table mounted in an inclined state with respect to a main body of an image reading apparatus, and a sheet material mounted on the sheet material mounting table is slid by utilizing the inclination of the sheet material mounting table. In a sheet feeding device of the type that feeds the sheet material placed on the sheet material placing table to a sheet material conveying unit downstream, a vibration generating unit for vibrating the sheet material placing table when feeding the sheet material placed on the sheet material placing table is provided. A sheet feeding device having. 2. A sheet material placing table mounted in an inclined state with respect to the main body of the image reading apparatus, and a sheet material placed on the sheet material placing table is slid using the inclination of the sheet material placing table. And a vibration generating means for applying vibration to the sheet material placing table when the sheet material placed on the sheet material placing table is fed. A sheet feeding device that is located upstream of the sheet conveying portion and that restrains the sheet material; and an up-and-down means that moves the sheet retaining member up and down with respect to the sheet material conveying surface. .. 3. A sheet material mounting table mounted in an inclined state with respect to the main body of the image reading device, and a sheet material mounted on the sheet material mounting table is slid using the inclination of the sheet material mounting table. In the image reading device in which the image is read by the reading device, the sheet material is fed to the sheet material transporting unit downstream, and the image of the sheet material transported by the sheet material transporting unit is fed. An image reading apparatus having a vibration generating means for giving vibration to the sheet material mounting table at that time. 4. A sheet material mounting table mounted in an inclined state with respect to the main body of the image reading apparatus, and a sheet material mounted on the sheet material mounting table is slid using the inclination of the sheet material mounting table. In the image reading device in which the image is read by the reading device, the sheet material is fed to the sheet material transporting unit downstream, and the image of the sheet material transported by the sheet material transporting unit is fed. In this case, a vibration generating means for giving vibration to the sheet material mounting table, a sheet damming member located upstream of the sheet transporting material transporting portion for damming the sheet material, and the sheet damming member on the sheet material transporting surface. An image reading apparatus comprising: an up / down unit for moving up and down. 5. The image reading device according to claim 3, wherein the image reading device is a facsimile.