JPH0361219A - Sheet carrying device - Google Patents

Abstract

PURPOSE:To ensure separation in a sheet carrying device for a copying machine, etc., by arranging a slope guide between a placing board and a separating means and providing a wedge member sloping in the same direction as the slope guide on the placing board. CONSTITUTION:A downslope wedge member 10 is provided on a placing board 2 and a similar downslope guide member 9 is also arranged between the placing board 2 and a separation portion 6. A preliminary carrying roller 4 and a separating roller 7 are placed in sequence at lower positions than the placing board 2 so as to be exposed in part on the guide member 9. In this way, the ends of stacked sheets S on the placing board 2 can be made in a wedge form to run along a press-contact member 8. It is thus possible to ensure separation.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a sheet conveyance device for documents, etc., which is applied to copiers, printers, etc., rather than facsimile.

<Prior Art> In facsimiles and the like, a document is conveyed by a conveying means to an optical reading system at a predetermined speed, its contents are read, and the document is transmitted to a recording system.

FIG. 8 shows an example of a document conveyance/reading system installed in a facsimile machine or the like.

According to the figure, a document f2 mounting table 100 that also serves as a device cover
When a plurality of originals S are set on the holder and a reading operation is performed, several originals S from the bottom among the plurality of originals S set above are read.
is guided by a document guide 110 provided on substantially the same horizontal plane as the document placement table 100 and conveyed by a direct conveyance roller 120 and a pressure contact member 130 that is in pressure contact with this, and is conveyed by a separation roller 140 and a pressure contact member 150 that is in pressure contact with this. The pieces are separated one by one.

Then, the separated document S is transported by the pair of transport rollers 160a and 160a.
60b, 170a, 170b, while passing through the optical reading means 180, light is irradiated from the light source 180a of the optical reading means 180, and the reflected light is reflected by the ξ sea 18.
0b and a lens 180c, light 1 from a CCD or the like is incident on a conversion element 180d, where it is converted into an electrical signal, and this signal is transmitted to a predetermined recording system.

<Problems to be Solved by the Invention> In the above-mentioned document conveyance/reading system, in order to reliably separate the stacked documents S one by one at the separation section consisting of the separation roller 140 and the pressure contact member 150, it is necessary to stack a plurality of documents S. The leading edge of the stack of originals is separated, and the end surface of the leading edge becomes the fourth
Although it is preferable that the wedge shape is shown in FIG.
0 are substantially on the same plane, the leading edge of the document bundle is not separated as shown in FIG.
40 parts may be transported.

For this reason, the conveyance force of the preliminary conveyance roller 120 is set to be large, and the leading edge of the document bundle is separated by the preliminary conveying roller 120 so that the end face of the leading edge changes from a perpendicular state to a wedge shape, or the separation roller 140 is Measures have been taken to separate the sheets one by one by setting a large conveying force to separate the leading edge of the stack of documents, that is, by breaking the end face of the leading edge from a perpendicular state into a wedge shape, but in both cases. The pinching force against the original documents S is strong, and the frictional force between the original documents S becomes large, so that so-called double feeding (multiple sheet feeding) may occur, in which the original documents S are conveyed while being overlapped without being separated from each other.

The present invention has been made to solve the problems of the prior art described above, and its purpose is to always reliably separate sheet materials one by one, regardless of the material, thickness, number, etc. of the sheet materials. An object of the present invention is to provide a sheet conveying device that can convey sheets.

<Means for Solving the Problems> The means for solving the above problems and applied to the embodiments described below are as follows: A sheet mounting table on which a sheet material is placed; a separating means for separating the sheet material one by one; a guide part inclined so as to guide the sheet material from the sheet storage stand to the separating means; and a guide part provided on the sheet placing stand and extending in the same direction as the guide part. It is characterized by comprising a wedge-shaped member that is slanted.

According to the above means, when the leading end of a plurality of sheet materials (sheet material bundle) stacked on the sheet loading table is pushed into the entrance side of the separating section, the leading end is bent along the guide section. As a result, the end surface of the tip portion becomes wedge-shaped.

At this time, depending on the material, thickness, number, etc. of the sheet material,
The leading end of the sheet bundle may try to deform into a curved shape without following the guide, but since the rear end of the sheet bundle is lifted up by the wedge-shaped member, such deformation can be minimized. available.

Therefore, the sheet materials on the sheet mounting table are sent to the separating section by the conveyance means, and are reliably separated one by one in the separating section.

If the wedge-shaped member is removably attached to the sheet mounting table, select and attach the wedge-shaped member with the optimal inclination angle depending on the material, thickness, number, etc. of the sheet material. becomes possible.

<Example> Hereinafter, an example of a sheet conveying device according to the above means will be described.

[First example]

Fig. 1 is a side sectional view of the sheet transport device, Fig. 2 is a perspective view of the sheet transport device, Fig. 3 is a sectional view of the entire facsimile equipped with the sheet transport device, and Figs. b) is an explanatory diagram showing the state of the end surface of the leading edge of a sheet bundle (original bundle);
The figure is an explanatory side cross-sectional view illustrating the curved state of the leading end portion of a sheet bundle (original bundle).

First, an outline of the entire facsimile will be explained with reference to FIG.

Reference numeral A in FIG. 3 denotes the main body of the factor counting device, which is composed of an original conveyance/reading system B and a recording system C.

The document conveyance/reading system B includes a document placement table 2 serving as a sheet storage table that also serves as a cover for the facsimile apparatus main body A;
A preliminary conveying section 3 includes a preliminary conveying roller 4 that conveys the document S as a sheet material from the document placing table 2 and a pressure contact member 5 that presses against the preliminary conveying roller 4; A sheet conveying device 1 is equipped with a separating section 6 consisting of a separating roller 7 that separates sheets one by one and a pressing member 8 that presses against the separating roller 7.

In addition, the document transport reading system B includes a sheet transport device 1.
Optical reading means 1 for reading the document st conveyed from
1 (Original table glass 11a as a reading section, light 11
1b), a photoelectric conversion element 11e) consisting of a mirror 11c, a lens lid, a CCD, etc., and this optical reading means 11
The pair of document feed rollers 12a and 12b are arranged on the entrance side (right side in FIG. 3) of the optical reading means 11, and the exit side (right side in FIG.
A pair of manuscript rollers 13a arranged on the left side of FIG. 3,
13b etc. are equipped.

The recording system C also includes a storage section 17 that stores the roll-shaped recording sheet 16, a platen roller 18 that pulls out the roll-shaped recording sheet 16 from the storage section 17, and a roll-shaped storage section 18 that pulls out the rolled recording sheet 16 from the storage section 17. a decurling mechanism 19 (decal shaft 19a1 guide shaft 19b) that removes curling of the recording sheet 16; a recording pad 2o that generates heat in response to an image signal and records a predetermined image on the pulled-out recording sheet opening 6; a cutter 21 that cuts the rear end of the recording sheet 16 on which is recorded; a paper discharge roller 22 that discharges the canted recording sheet 16;
Equipped with stacker 23 etc.

Next, a portion of the sheet conveying device 1 will be described in detail with reference to FIGS. 1 and 2. Note that the sheet conveying device 1 is shown with the pressing member 5 omitted in FIG. 1, and the sheet conveying device 1 with the pressing member 5.8 omitted in FIG.

Sliders 2a and 2b are provided at the center of the upper surface of the document table 2 to align both side portions of the document S and to guide the both side portions in the direction of the arrow shown in FIG. ) is movably installed.

Further, the preliminary conveyance rollers 4 constituting the preliminary conveyance section 3 are used for the document s! The separating roller 7 constituting the separating section 6 is arranged at a lower position than the upper surface of the mounting table, and the separating roller 7 forming the separating section 6 is arranged at a lower position than the preliminary conveyance roller 4.

A window hole 9 through which a part of the preliminary conveyance roller 4.4 and the separation roller 7 are exposed is provided between the document placement table 2 and the separation unit 6.
A downwardly inclined guide portion 9 having a, 9a and 9b is provided.

This guide section 9 separates the document S from the document placement table 2 at the separation section 6.
It is inclined downwardly from the vicinity of the upstream side of the feed roller 4 in the conveyance direction to the vicinity of the downstream side of the separation roller rough.

Therefore, a plurality of documents S are stacked on the document table 2, and the leading edge of the stacked documents S (document bundle) is moved along the guide section 9 between the separating roller 7 of the separating section 6 and the pressing member 8. When the document is pushed into the space 6a (near the upstream side of the separating section 6) formed by the original and the leading edge of the original is pushed in as shown in FIG. 4(a). ! It is bent relative to the part placed on the mounting table, and the tip portion is thereby split and the end surface of the tip portion becomes wedge-shaped. That is, as shown in FIG. 6B, the end surface of the tip portion is aligned with the inclined pressure contact member 8.

Here, the inclination angle θI (see FIG. 2) of the guide section 9 with respect to the upper surface of the document mounting table 2 is determined by the inclination angle θI (see FIG. It suffices if the edge of the leading edge is wedge-shaped when the portion is separated, and the material of the document S,
Although it differs depending on the thickness, number of sheets, etc., it may be set within the range of 5 @ to 30 @.

However, even if the skew angle θ of the guide section 9 is set as described above, depending on the paper quality, thickness, number of sheets, etc. of the document S, the leading end of the document bundle may bend along the guide section 9. As shown in FIG. 5, the document may be deformed into a curved shape as shown in FIG. is the angle θ.

′ becomes larger.

In this way, the angle θ between the leading end of the document bundle and the guide section 9. ′ becomes large, the lowest original S becomes prefiiff
If the document S is separated from the feed roller 4 (a gap is created between the lowest document S and the preliminary roller 4), the document S
Even if the document does not move away from the preliminary conveyance roller 4, the weight of the document bundle hardly acts on the preliminary conveyance roller 4, or the leading edge of the document bundle hits the separation roller rough and is moved downstream (optically) from the separation roller 7 in the conveyance direction. reading means ll side)
or may no longer be transported.

Therefore, in order to prevent this, the sliders 2a, 2
A wedge-shaped member 10 is provided between b and is inclined so that it is lower on the guide part 9 side and higher on the side away from the guide part 9.

This wedge-shaped member 10 is provided at the rear end of the document bundle to prevent the leading end of the document S from separating from the preliminary conveyance roller 4 or hitting the separation roller rough when the leading end of the document S is bent by the guide section 9. It raises the part slightly,
As a result, as shown in FIG. 1, the angle θ between the leading end of the document bundle and the guide portion 9 is increased. It is possible to obtain a deformed state of the document bundle such that θ becomes small (θ.×θ.′).

Here, the inclination angle θ8 of the wedge-shaped member 10 with respect to the upper surface of the document mounting table 2 is smaller than the inclination angle θ1 of the guide portion 9, and is set to about 5° to 25°.

The wedge-shaped member lO is set to such an angle range.
If the inclination angle θ2 of is smaller than 5'', the wedge-shaped member 1
If the effect of providing 0 is not obtained and the inclination angle θ2 of the wedge-shaped member 10 is larger than 25°, the guide portion 9 presses the end face of the leading end of the document bundle by the pressing member 8 as shown in FIG. 4(b). This is because it will not be possible to make it comply with the above.

Further, the height C of the wedge-shaped member 10 is set lower than the height d of the sliders 2a and 2b, as shown in FIG. 1, so that the document bundle does not protrude from the sliders 2a and 2b.
Both sides of the document S are guided by sliders 2a and 2b.

Furthermore, as shown in FIG. 2, the width e of the wedge-shaped member IO is set smaller than the distance f between the sliders 2a and 2b when the sliders 2a and 2b are brought closest to each other, It is designed so that it does not get in the way of 2b's movement.

Furthermore, the tip of the wedge-shaped member 10 is connected to the slider 2.
It is located almost on the same line as the front end surface of a%2b. When the tip of the wedge-shaped member 10 protrudes from this position, the wedge-shaped member IO approaches the guide portion 9 and the operation cover 14 (see FIGS. 1 and 3) gets in the way when setting the document S. Also, ff1ffl of the original S is the preliminary conveyance roller 4.
If the document bundle cannot be sufficiently deformed (see FIG. 1), or if the tip of the wedge-shaped member 10 retreats from the above-mentioned position and becomes too far away from the guide member, the wedge-shaped member 10 is removed. No effect is obtained.

Note that the document conveying and reading system B is covered with an operation cover 14 except for the document placing table 2 portion. and,
Although not shown, the operation cover 14 is equipped with various operation keys etc. on the front side and electronic circuits etc. on the back side.

Further, on the back side of the operation cover 14, the pressure contact member 5.
8. A document feed roller 12b and a document discharge roller 13b are attached, and when the operation cover 14 is opened, these pressure contact members 5.8, document feed roller 12b, and document discharge roller 13b are attached to the facsimile apparatus main body A. The preliminary conveyance roller 4, separation roller 7, and document feed roller 1 are attached to the side.
2a1 is separated from the document ejecting roller 13a so that jamming of the document S, etc. can be easily performed.

Further, the preliminary conveying roller 4 of the preliminary conveying section 3 is formed into a substantially elliptical shape, consisting of a circumferential portion and a flat portion. Further, as shown in FIG. 3, the pressure contact member 5 of the manual conveyance unit 3 is swingably attached to the back side of the operation cover 14 via a pin 5a, and is also supported by a spring (not shown) for preliminary conveyance. The roller 4 is urged in the direction of the roller 4 and is pressed against the preliminary conveyance roller 4 .

When the preliminary conveyance roller 4 rotates and the circumferential part faces the pressure contact member 5, the circumferential part comes into pressure contact with the pressure contact member 5, and when the flat part faces the pressure contact member 5, the flat part comes into pressure contact with the pressure contact member 5. A gap is created between the member 5 and the document S, so that the document S is intermittently conveyed.

Further, the pressure contact member 8 of the separation section 6 is swingably attached to the friction piece 8a and the back side of the operation cover 14, and is attached to the F2.
Friction piece holder 80 that pushes the 11 pieces 8a toward the separation roller 7 side
and a spring 8c, and the spring force of the spring 8c acts on the friction piece 8a via the friction piece holder 8b, so that the friction piece 8a comes into pressure contact with the separation roller 7.

Further, the document feeding roller 12b and the document feeding roller 13
When the operation cover 14 is closed, the spring force of the pressing spring 15 urges the document feeding roller 12a and the document feeding roller 13a.

Further, as shown in FIG. 3, the document mounting table 2 is provided so as to be openable and closable with respect to the main body A of the factor printing apparatus using a bin 2c as a fulcrum, and accommodated when replacing the rolled recording sheet 16, etc. Section 17 can be opened.

Further, a decurling shaft 19a constituting the decurling mechanism 19 of the recording system C is provided on the back side of the document*2 table 2, as shown in FIG. Further, the guide shaft 19b of the decurling mechanism 19 is connected to the recording sheet 16.
As the winding diameter of the recording sheet 16 becomes smaller, it rotates about the pin 19c as a fulcrum as shown by the dotted line in the figure, and the decurling shaft 19a of the recording sheet 16 is rotated to support the conveyance roller 4, separation roller 7, document feed roller 12a, The original document roller 13a rotates in the direction of the arrow shown in FIG. Light is emitted, and the reflected light enters the photoelectric conversion element 11e via the mirror 11c and the lens lid, where it is converted into an electrical signal and transmitted to a predetermined recording system.

Further, during recording, the platen roller 18 rotates to pull out the rolled recording sheet 16 from the storage section 17 , and the decurling mechanism 19 removes curls from the rolled recording sheet 16 and conveys it to the recording head 20 . Then, a predetermined image is recorded on the recording sheet 16 by a recording head 20 that generates heat in response to an image signal, the trailing edge of the image is cut by a cutter 21, and the sheet is discharged to a stacker 23 by a paper discharge roller 22.

According to the first embodiment, when reading a document,
The leading end of the document bundle is bent along the guide section 9, and the end surface of the leading end becomes wedge-shaped when the document bundle is separated. There is.

Reference numeral 24 in FIG. 3 is a power supply for the main body A of the facsimile machine.

Next, the operation of the first embodiment will be explained.

When reading the original, the original S is the original 1II3! Stand 2
Set multiple sheets stacked on top of the document S.
A space portion 6a formed by the separating roller 7 of the separating portion 6 and the pressing member 8 along the guide portion 9
Push it all the way.

At this time, the document S is detected by a document sensor (not shown) provided on the inner surface of the operating section 14 near the iJIm feed roller 4, and the document S is moved in the direction of the arrow shown in FIG. The leading edge of the original bundle is bent and fanned along the guide part 9, and the end surface of the leading edge becomes wedge-shaped, while the rear part of the original bundle is bent and fanned along the guide part 9. The end portion is slightly lifted by the wedge-shaped member 10, so that the weight of the document bundle acts on the preliminary conveyance roller 4.

Then, when the document reading operation is started, the conveying force of the preliminary 6 is increased (the pressing force of the pressing member 5 against the preliminary conveying roller 4 and the pressing force of the pressing member 8 against the separation roller 7 are increased) to separate the document bundle. There is no need for sorting, and so-called double feeding (feeding of multiple sheets), in which the documents S are conveyed in an overlapping manner without being separated from each other, does not occur.

In addition, the pre-01wt feed roller 4 and separation roller 7 are
Since it is located below the stand 2, the amount of upward protrusion of the operation cover 14 that covers these with respect to the document 11r1 and the stand 2 is reduced, and the overall height of the facsimile apparatus main body A can be reduced. Further, since it is not necessary to increase the pressing force of the pressing member 8 against the separation roller 7, that is, it is not necessary to place the pressing member 8 in an almost upright state and strongly press it against the separating roller 7, the pressing member 8 can be laid down. (By reducing the inclination angle of the pressing member 8), the overall height of the facsimile apparatus main body A can be further reduced.

Furthermore, the rear end of the document bundle is slightly lifted by the wedge-shaped member 10, and the leading end of the document bundle is bent in a curved shape and lifted off the preliminary conveyance roller 4, preventing it from hitting the separating roller rough. Conveying force is reliably transmitted from the rollers 4 to the document S.

Furthermore, in order to prevent the leading edge of the document bundle from lifting up from the preliminary conveyance roller 4, it is not necessary to press the document bundle strongly against the pressing member 5 (JIS feed roller 4).
A situation in which a thin document S jams or a thick document S is fed twice does not occur.

[Second example]

FIGS. 6(a) to 6(d) show a second embodiment of the sheet conveying device 1. FIG.

According to this second embodiment, the wedge-shaped member 10 is detachably attached to the document vi mounting table.

That is, the engagement legs 10 are provided at the four corners of the bottom surface of the wedge-shaped member 10.
a, and sliders 2a, 2 of the document placement table 2 are provided.
An engagement hole 2c, in which the cough engagement leg 10a is removably engaged, is provided in the center between the openings.

When attaching the wedge-shaped member 10 to the document 74M'l1 stand 2, the engagement leg 10a is once bent inward as shown by the dotted line in FIG. 6(c), and the engagement leg 10a is inserted into the engagement hole 2c. When pushed in almost completely, the restoring elastic force of the engagement JIl 1110a returns to the original state, and the engagement leg 10a is locked to the periphery of the engagement hole 2c.

When the wedge-shaped member 10 is detachably attached to the document IT stand 2 in this way, the wedge-shaped member 10 having the optimum inclination angle θ2 according to the paper quality, thickness, etc. of the document S can be selected and used. It becomes possible to do so.

[Third Example]

FIG. 7 shows a third embodiment of the sheet conveying device 1. As shown in FIG.

According to this third embodiment, the separation roller is moved from the center position of the preliminary conveyance roller 3 to the portions of the guide portion 9 on both sides in the width direction perpendicular to the document conveyance direction, that is, the portions on which both end portions of the document S in the width direction are applied. Sheet path portions 9c, 9c having a predetermined width are formed over seven positions. Note that the parts other than the seat path section 9c have the same configuration as the first embodiment, so the same reference numerals are given and the explanation thereof will be omitted.

The sheet path section 9C29c is formed by recessing the upper surface of the portion of the guide section 9 on both sides in the width direction, and its bottom surface 9C' is gently curved against the substantially horizontal document guide surface 11f of the optical reading means 11. It is inclined.

Here, the width L of the sheet path portion 9C (LL).

L,) is A4 size (210mm) or B4 size (25mm).
For example, the distance from the center of the guide section 9 to 85 mm (L2
) to 150 questions (L, ”).

By providing the sheet path portion 9c in this way, even if there is a change in the conveyance path when the trailing edge of the document S comes off the separation roller 7 and moves to the optical reading means 11 during conveyance of the document S,
That is, even when the document S is shifted from the inclined guide portion 9 to the substantially horizontal document guide surface 11f, the change in the conveyance path of the document S at both ends in the width direction is kept small by the sheet path portion 9C.

Therefore, when the trailing edge of the document S leaves the separation roller 7,
There is little wobbling at both ends of the document S in the width direction, and there is very little disturbance in the read image due to the wobbling, making it possible to obtain a good read image.

[Other Examples]

In the first and second embodiments, a case has been described in which the sheet a feeding device 1 is installed in the document conveying/reading system B of a facsimile machine to convey the document S, but the present invention is not limited to this. It can also be installed in the sheet a transport system to transport recording sheets.

Furthermore, in the first, second, and third embodiments, the guide section 9 is constructed separately from the document mounting table 2, but the guide section 9 and the document mounting table 2 may be constructed integrally. good. In this case, when the guide section 9 and the document mounting table 2 are opened, the guide section 9
It becomes possible to simultaneously open the operation cover 14 in some parts.

Furthermore, in the first, second and third embodiments, the case where the inclination angle θ2 of the wedge-shaped member 10 was set smaller than the inclination angle θ1 of the guide portion 9 was shown, but the inclination angle θ2 of the wedge-shaped member 10 was set smaller than the inclination angle θ1 of the guide portion 9. may be set larger than the inclination angle θ1 of the guide portion 9. In this case, the direction of inclination of the end surface of the leading end of the document bundle is as shown in FIG. 4(C).
Since this is the opposite side to that in the third embodiment, the pre-01 conveyance roller 4 and separation roller 7 may be provided on the operation cover 14 side.

<Effects of the Invention> As described above, according to the present invention, a guide section is provided on the sheet mounting table, and a guide section is provided on the sheet mounting table, the guide portion being inclined with respect to the sheet placing table so as to guide the sheet material from the sheet placing table to the separating means. Since a wedge-shaped member is provided which is inclined in the same direction as the guide portion, the sheet materials can always be reliably separated and conveyed one by one regardless of the material, thickness, number, etc. of the sheet materials.

In addition, when a wedge-shaped member is removably attached to the sheet mounting table, a wedge-shaped member with an optimal inclination angle should be selected and attached according to the material, thickness, number, etc. of the sheet material. This makes it possible to separate and transport sheet materials one by one more reliably.

[Brief explanation of drawings]

1 to 3 show a first embodiment of the present invention,
FIG. 1 is a side sectional view of the sheet feeding device, FIG. 2 is a perspective view of the sheet feeding device, FIG. 3 is a sectional view of the entire facsimile equipped with the sheet feeding device, and FIG. )
(C) to (C) are explanatory diagrams showing the state of the end surface of the leading edge of a sheet bundle (original bundle), and FIG. FIGS. 6(a) to 6(d) are side sectional views showing
A second embodiment of the feeding device is shown, in which figure (a) is an exploded perspective view with some parts omitted, figure (a) is a back view of the wedge-shaped member, and figure (c) is a side view of the same. , FIG. 7(d) is a partial cross-sectional view showing how the wedge-shaped member is attached to the sheet mounting table, and FIG. 7 is a partially omitted perspective view showing the third embodiment of the sheet conveying device. FIGS. 8 and 9 show the prior art. FIG. 8 is a partial side sectional view, and FIG. 9 is an explanatory diagram showing the state of the end surface of the leading end of the document bundle in the prior art. A is the main body of the facsimile machine, B is the document transport and reading system,
C is a recording system, 1 is a sheet conveyance device, and 2 is a sheet mounting table (
3 is a preliminary transport section, 4 is a preliminary transport roller, 5 is a pressure contact member, 6 is a separation section, 7 is a separation roller, 8 is a pressure contact member, 9 is a guide section, 10 is a wedge-shaped member, 10a is an engagement leg, and 2c is an engagement hole.

Claims (2)

[Claims] (1) A sheet mounting table on which a sheet material is placed, a separating means for separating the sheet materials transported from the sheet mounting table by a transporting means one by one, and a separating means for transferring the sheet material from the sheet mounting table to the separating means. A sheet conveyance system comprising: a guide section inclined with respect to the sheet mounting table so as to guide the sheet; and a wedge-shaped member provided on the sheet mounting table and inclined in the same direction as the guide section. Device. (2) The sheet conveying device according to claim 1, wherein the wedge-shaped member is configured to be detachably attached to the sheet mounting table.