JPS5957837A - Automatic sheet feeder - Google Patents

Abstract

PURPOSE:To apply strong carrying force from a preliminary carrying means onto a sheet only when required by arranging an unilateral clutch and a brake mechanism for prventing reverse rotation in a system for transmitting power to the preliminary carrying means. CONSTITUTION:When a document 1 fed from a separating section 7 is held by a reading carry roller 8, the carry roller 5 is driven by said roller 8 through the document 1 but since the rotation of a gear 18 is constant, a spring clutch 21 is loosened. Since the spring clutch 21 will receive driving force from the boss section 5a of a feed roller 5 to transmit rotary force to a rotary shaft 17, a friction member 31 is pressure contacted against the outercircumferential face of the boss section 20a of a timing pulley 20 to apply rotary load higher than the reverse rotation between the rotary shaft 17 and the preliminary carrying roller 3.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides facsimile devices, nuclear copying, etc. 1. Sheets used in image forming equipment! IIv feeding device.

An example of application to a facsimile machine will be described below.

The conventional automatic sheet feeding device has a cylindrical roller that rotates in the direction of feeding sheets, such as manuscript paper, to the reading section of a facsimile machine, and a coefficient of friction μ! between the surface of this cylindrical roller and the manuscript paper. The sheet rotates in the same direction as the friction piece or the cylindrical roller, which has a friction coefficient μm with the original paper that is smaller than μm and larger than the friction coefficient μm between the original 114 papers. In other words, a cylindrical roller (hereinafter referred to as a reversing roller) that rotates in a direction that moves the manuscript paper away from the reading unit is disposed in close proximity to or in contact with it, and a plurality of stacked manuscript papers are arranged in close proximity or in contact with each other. The paper was separated one by one and fed to the reading section.

Therefore, this abrasive material is disposed close to or in contact with the cylindrical roller and separates and feeds the manuscript sheets one by one (hereinafter referred to as the separation section). The operability of this type of equipment is ensured by the reliable feeding of
This is an important point in increasing reliability.

Conventionally, the original stacking table was tilted so that the original sheets stacked on it would reach the recessed portion by their own weight. However, in recent years, there has been a demand for miniaturization and operability of the apparatus, especially ease of handling manuscript paper, and in response to this demand, it has become necessary to make the manuscript loading table horizontal. Therefore, a means (hereinafter referred to as a preliminary conveying means) for conveying the document paper to the separating section is required, but this preliminary conveying means requires sufficient care in setting its conveying force. In other words, if the conveyance force is too strong, it may cause so-called overlap feeding in which multiple sheets of document paper are simultaneously fed against the frictional force of the wall scraper or reversing roller that holds the document sheets other than those to be fed at the moment. Become. In addition, damage to the leading edge of the original paper that is stuck to the hesitation A piece or the reversing roller may occur. on the other hand.

If the conveyance force of the preliminary conveyance means is too weak, it becomes impossible to feed the stacked originals to the separating section against resistance of the conveyance path such as frictional force with the document stacking table and the guide plate.

As a method for dealing with these problems, there is a method in which a non-cylindrical roller is used as the transport means to apply a transport force intermittently to the original paper. but,
In this case as well, the same danger as described above always accompanies the moment when the conveying force is applied.

A sensor is installed on the downstream side of the conveyance path of the 1-separation section to detect document paper, and after only one sheet of document paper has protruded from the 1-separation section, the pressure contact means of the preliminary conveyance roller is released to apply preliminary conveyance force to the document paper. There are also known devices configured so that they do not act.

However, in this case, a plunger and a cam are used to obtain the power to release the pressure of the sensor and preliminary conveyance.

This requires a motor, etc., and a complicated board configuration for control.

The purpose of the present invention is to eliminate the drawbacks of the conventional upper FTE.

The present invention provides a reliable automatic sheet feeding device with a +W+ vehicle configuration. Therefore, in the present invention, the power transmission means of the preliminary conveyance means is improved.

The preliminary conveyance force is applied strongly to the sheet only when necessary, making highly reliable automatic sheet feeding possible.

That is, the present invention achieves the above object by cooperating with a feeding roller that rotates in the direction of feeding the sheets and a rubbing material that is close to or in contact with the feeding roller. (In an automatic sheet feeding device that feeds sheets one by one, a means for conveying the stacked sheets to a portion where the feeding roller and the friction material come into close proximity or contact, and a means disposed downstream of the conveying means, a rotating shaft coaxially holding a power transmitting means for transmitting rotational power to the roller and the feeding roller; a one-sided clutch means provided on the rotating shaft capable of intermittent power transmission; A means of transmitting power from the shaft.

This invention provides an automatic sheet feeding device characterized in that it includes a braking device that applies a load resistance to the rotating shaft that is larger than the idling torque of the dC one-way clutch device.

Hereinafter, an embodiment to which the present invention is applied will be described with reference to one drawing.

FIG. 1 is a side view for explaining the operation of an automatic feeding device to which an embodiment of the present invention is applied.

In the figure, a number of manuscript papers 1 are stacked on a horizontal manuscript stacking table 2. Following the document loading table 2, a non-cylindrical pre-conveyance roller 3 and a roller 4 above which clamps and presses the document sheet 1 being conveyed are elastically arranged by a spring 4a. These preliminary conveyance rollers 3 and rollers 4
This provides a preliminary conveying force. A feeding roller 5 that rotates in the direction of feeding the original paper 1 is disposed downstream of the preliminary conveying roller 3, and a part of a friction piece 6 is provided in pressure contact with or in close proximity to this roller 5. . Here, the coefficient of friction j between the outer circumferential surface of the feeding roller 5 and the original paper 1 is μm, the coefficient of friction between the roof scraper 6 and J'ji', 4'7;1 a 1 is μm, and the coefficient of friction between the original paper IIJ! ]! Let the I-ship be μ, then the materials and shapes of each are determined so as to support the relationship between μ, 〉μ, and 〉μ. The JjA+'tu paper is separated one by one in the separating section 7ζ where the feeding roller 5 and the friction piece 6 are arranged IM, and is further sent to the conveyance system A on the downstream side. This conveyance system A includes reading conveyance rollers 8, 10. and pressure welding rollers 9 that press against each other.
11, the rollers 8 and 1O are spaced apart, and the sensor 16 and the reading section 12 are arranged therebetween. The document sheets separated one by one are conveyed by a predetermined conveyance amount I11 by the conveyance system A. The image passes through the reading section 12. The image is displayed on a mirror 13 located at the bottom of the reading section 12. The image is formed on the image sensor 15 through the lens 14 and converted into an electrical signal. Here, the sensor 16 is used to detect the leading edge and trailing 1/iM of the JQ paper to determine the conveyance amount at the reading section 12 years old.

In order to detect the leading and trailing edges of the document paper 1 that is continuously fed by the sensor 16, the power transmission system is configured so that the circumferential speed of the reading conveyance rollers 8 and 10 is greater than the circumferential speed of the paper feed roller 5. Then, the force blown into the reading carry-in roller 8 and the roller 9 is λ, and then the force 1 is fed by the feeder 1]-ra 5.
1. The space between the paper and the original paper is increased. Minute # [
f: 1) When the manuscript paper from B 7 is blown into the feed roller 8 and the roller 9, due to the difference in circumferential speed between the rollers 8 and 5, the manuscript paper 4? The feed roller 5 is driven by the conveyance roller 8 (via the roller) 47. Note that it is necessary that the feed row 55 is provided with a one-sided clutch to cut off the power from the power transmission system.

Figure 2 shows the seat of the present invention! It is a top view (-? IS section 1lIi) of the ItIJ feeding device.

In the figure, a fixed shaft 26 is disposed 1t with the feeding direction of the manuscript paper 1 cut 04, and a preliminary loading roller 3 is rotatably ζ. This is fitted. Furthermore, a rotating tit 17 is disposed parallel to this fixed shaft 26, and feeding (]-] ra 5-j, υ, and gear upper 8 are rotatably fitted to this rotating llll 1117, respectively. A collar 19 and a Quimink pulley 20 are each fixed to the rotating shaft 17 with a parallel pin or the like.Furthermore, one spring clutch is attached to the boss portion 18a of the gear 18, the collar 19, and the boss portion 5a of the feeding roller 5. 21 is attached to the outer surfaces of these three members. That is, a spring clutch 21 is provided to engage each of the rotating shaft 17, the gear 18, and the feeding roller 5. fixed timing pulley 2
0 and the preliminary conveyance roller 3 are connected via the belt 27 to the C! Il
v force is transmitted. Note that the drive motor 22
The gear 23 attached to the output shaft meshes with the gear 1 and the gear 24 of the reading and conveying roller 8 to transmit power to each other, and the roller 8 and the roller 10 transmit rotational power via a timing belt 25. Communicate.

In this device, when a plurality of original sheets 1 are loaded on the original loading table 2 and the drive motor 22 is started in response to a # transmission signal, the gear 18 is rotated 5 times as shown by the arrow in FIG. Then, it rotates counterclockwise in the H1 direction. Here, suppose that the fine clutch 21 is wound with a right-handed screw.

The spring clutch 21 is tightened by the rotation of the gear 18, and the power is transmitted from the boss portion 18 to the collar 19, and further transmitted to the introduction roller 5 by valving the boss portion 5a. Since the collar 19 is fixed to the rotation 11Illl17, the power is rotation! 11117° Timing pulley 20 and belt 2
The preliminary conveyance roller 3I is transmitted through FA4?4.
G1 is transported to minute y',b +XlS7. Separation part 7
In.

Feed roller 5 and the feed roller 5 in close proximity or contact ``1-
Due to the above-mentioned cooperation with the friction piece 6, only the original paper in the lower layer of the jet is fed in the direction of the reading conveyance roller 8, and the other original papers 1 are stopped at the separating section. 1 minute later! l1l
When the document sheet fed out from the portion 7 is bitten by the reading conveyance roller 8, the sheet of document sheet is continuously fed at the circumferential speed of the reading conveyance roller 8. At this time, as described above, the feeding roller 5
is driven by the reading conveyance roller 8 through the original paper,
jL+e Taking and straining feed roller 8 (1) Rotates at speed J standard. Since the number of revolutions of the seventh wheel 18 is constant, the manuscript paper is readable at A
When the feed roller 5 is bitten by the V feed roller 8, the rotational speed of the feed roller 5 becomes higher than that of the gear 18.

First, even though the gear 18 is rotating counterclockwise, the spring clutch 21 is
8, the rotational power of the gears 1 and 8 is no longer transmitted to the feeding roller 5 and the collar 19, and the rotating shaft 1
7 and the preliminary conveyance roller 3 as well, the rotational power is no longer transmitted. Therefore, the conveyance force is not applied to the document paper that is stopped.

Now, the trailing edge of the manuscript paper fed out from the feed roller 5 is 1 minute.
When the sheet passes through the 1L section 7 (FIG. 1), the power transmitted from the reading conveyance roller 8 to the feed roller 5 via the document sheet is cut off. Therefore.

The spring clutch 21 is tightened again, and the gear 18 to the collar 19
The power is transmitted to the feed roller 5#. At the same time, the preliminary conveyance roller 3 is also driven, and the remaining original papers that are still stationary are reliably fed to the separating section 7. In this way, the above operation is repeated.

FIG.
This is a partial side view showing the operation of the iI conveying roller 3, and shows a case -8- in which four other structures are used for the pressure contact structure of the roller 4.

As shown in FIG.
As shown in Figure 3, the shape and dimensions are determined so that it has a flat surface 4173/3b that does not protrude from the top surface of the original I^ treetop mounting base 2. In the figure, the non-circular part 9M is shown with a square cross section, but it is not necessarily necessary to have this shape; if necessary, other polygonal cross sections such as triangular, triangular, etc., or other cross-sectional shapes may be used. 4 is rotatably attached to the tip of an arm 28. The other end of this arm 28 is rotatable in a fixed position, and its middle part is pressed by a spring 29 to hold the one-length M manuscript platform 2. A stopper 30 is installed so that there is a gap g between the sieve on the top surface and the quotient on the bottom surface of the roller 4.

When this device is removed, the non-circular part 1 and the conveying roller 3 are placed on the side I.
When IJυ, the bottom layer of the plate (-paper) that is fed out from the top 3a of the screen (this is where the manuscript paper is loaded and the paper is conveyed) and the paper is collected in the Bitten by conveyance roller 8 and roller 9.

The non-cylindrical preliminary conveyance roller 3 from the motor 22 is rotated! When the assistance provided by I is cut off, the non-cylindrical preliminary conveyance roller 3
The bottom layer of original paper continues to rotate around the top part 3II of the paper until it reaches the state shown in FIG. 3 (+>1. In this state,
Since the stopper 30 maintains a gap g between the roller 4 and the top surface of the document loading table 2 at that height, the non-cylindrical preliminary conveyance roller 3 is not rotated by the original f-high paper, and the power is cut off. Therefore, it stops in the state shown in FIG. The preliminary transport function is completely stopped.

Here, a one-way clutch generally transmits some (1) torque even if it is rotated in a direction that does not reach 1 m of power. However, in a case where the spring clutch 21 is used, the twisting force in the opposite direction cannot be avoided. Even if the spring clutch 21 is loosened by rotating at a high speed, the spring clutch 21 will rotate due to the driving force from the boss portion 5a of the feeding roller 5, and the collar 1
Transfers the rotational force to the rotation @17 where 9 is added together. This rotational force is transmitted to the preliminary conveyance roller 31 by the timing pulley 20 and timing belt 27. Here, since the preliminary conveyance resistance of the sheet is extremely small, even a twisting force of this degree will apply conveyance force to the sheet.

Therefore, in this embodiment, the rotation shaft 17 and the preliminary conveyance roller 3
A rotational load larger than the above-mentioned drag force is provided between the unidirectional clutch and the unidirectional clutch so as to increase the reliability of the VJ'r engagement operation.

Examples of this will be explained below.

That is, as shown in FIG.
The outer circumferential surface i of the boss portion 20a is formed 114 so as to press against the bank material 31 to apply braking.

This 1+'SU' 31 is made of a suitable material such as felt or rubber, and is pressed against the boss portion 20a1 of the timing pulley 20 by a fixed spring 32 or a plate spring 32.

As in the above embodiment, the frictional force causes t! In the method of multiplying PI' i by the frequency of use and environmental conditions,
'% IP of member: 3t'=changes in force may occur.

FIG. 5 shows a further 14th embodiment which eliminates these drawbacks.

In this embodiment, the boss portion 2 of the timing pulley 20 is
0b is a non-cylindrical shape, and 5 this non-cylindrical boss portion 20bl
The flat spring 32 is pressed against the plate spring 32, and the braking force is applied to the leaf spring 32 in a pulsating manner. In this case t
Yes, you can get a stable groan suppressing effect without using a massage shrine.

Still other examples will be shown.

; In the embodiment shown in Fig. 86, in the power transmission thread that is transmitted by gears instead of the timing belt 27, a thrust-side braking device (1j Te Therefore, it is a little thing.For that reason, /to fire color'
In shi 0, 1 rule yi of 1 guide car 33! 1ljll to ! 1
A washer 34 is provided, and a compression coil spring 35 is installed between this washer 34 and the rigid side plate 40.
・Jke 7 Komono, gear 331! A thrust force in the direction of the thrust force is applied by the pressure head coil spring 35 through the washer 34 for one-ill movement.

In the embodiment 17 described above, an appropriate lλ braking effect can be achieved by appropriately selecting the spring force, the thickness of the brake, or the shape.

Furthermore, an example of the song is shown in FIG.

In this embodiment, as shown in FIG. 7, the hydrodynamic i1+lJ
Power may also be used. In this case, goo sink 36
A liquid 37 with an appropriate viscosity is sealed inside, and when a blade 38 placed on a 1st wheel 33 rotates in the liquid, it receives a sea bream force. Since such parts using liquid tamper are widely used, it is possible to realize them at low cost by selecting an appropriate part shape.

As explained above, according to the present invention, due to the predetermined step 114C, a strong conveying force can be applied to the sheet by the pre-feeding means only when necessary. Thereby, a highly reliable automatic sheet feeding device can be obtained.

In the above explanation, the self-excited feeding mechanism of a document reading device was explained as an example, but the present invention can also be used as a self-exciting paper feeding device that feeds cut recording paper to a recording section I. That's not a big deal. A similar effect can also be obtained with a machine 1η in which the table on which sheets (manuscript paper, nuclear copy paper, film sheets, etc.) are stacked is tilted.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a side view of part D1 of a non-inventive embodiment in which a facsimile machine is applied, and Figs. . 2... Gengoku mounting table 3, 28... Hand-carved conveyance roller 5' Feeding roller 6... Grinding piece 8, 10... ・Reading conveyance roller 22..., ・Motor 32 ... Leaf spring 34 ... Washer 35 - Compression coil spring 36 ... Casing 37 ... Liquid 38 ... Impeller 5 j 32 ? Z 3z and 7

Claims (1)

[Claims] (1) A feed roller that rotates in the direction of sheet feeding and a roller that is close to or in contact with the first feed roller work together to feed out several sheets one by one one by one. In automatic sheet feeding equipment. means for conveying the stacked sheets to a portion where the feeding roller and the friction H are close to or in contact with each other; a rotating shaft disposed downstream of the conveying means and coaxially holding a feeding roller and a power transmission means for transmitting rotational power to the feeding roller; A one-way clutch means provided on the rotating shaft and capable of intermittent power transmission. Of Self-single sheet feeding device.