JPS62264138A - Sheet conveying device - Google Patents

Abstract

PURPOSE:To obtain a conveying device which performs double feed during first separation and which hardly breaks a sheet separated during secondary separation, by forming the arrangement of first feed means and separating means to be identical wit the arrangement of second feed means and separating means. CONSTITUTION:There are provided a feed roller 253, a separating roller 265, a feed roller 257 and a separating roller 265 to conduct two stage separation. The arrangement of the first feed roller 253 and the separating rollers 265 for first stage separation is made to be identical with the arrangement of the second feed roller 257 and the separating roller 269 for second stage separation. Accordingly, even if a sheet subjected to double feed during first stage separation is subjected to second stage separation by the separating roller 269 for separating the same, the separating roller 265 for first stage separation is rotated at a speed equal to that of the separating roller 269 for second stage separation, and therefore, the sheet separated by the separating roller 269 is directly fed rearward by the separating roller 265 so that the double-fed sheet is prevented from being broken. Accordingly, it is possible to provide a sheet conveying device that hardly breaks a sheet which is double-fed during first stage separation and separated during the second stage separation.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is applicable to copying machines, laser printers, liquid crystal printers,
An automatic document that automatically feeds a document onto a sheet feeding device attached to the sheet intake port of an image forming device such as an Iso, or a platen of an image processing device such as a copying machine, facsimile, or Image League. The present invention relates to a sheet conveying device such as a feeding device.

(Prior Art) Conventionally, an automatic document feeder installed in an image processing device such as a copying machine includes a feed roller that rotates and feeds the document stacked on a document tray in the document conveyance direction, and a feed roller that feeds the document, and A roller is provided facing the roller, rotates in the opposite direction to the direction in which the document is conveyed, and separates the documents and feeds them out one by one by means of a roller that rejects the documents sent out by the feed roller. The document is conveyed onto the platen by a conveyor belt, set at a reference position, and after copying is completed, the document is discharged from the platen by the conveyor belt and stored in a paper discharge tray.

[Problem that the invention seeks to solve]

In such an automatic document feeder, if multiple documents are fed (group feed), some documents will not be copied, so improvement in separation performance is required. Therefore, the inventor thought about separating the sheets twice, but
If two-stage separation is simply performed, the sheet will be more likely to be damaged as the number of separations increases.

[Purpose of the invention]

An object of the present invention is to provide a sheet conveyance device that improves separation performance and is less likely to damage sheets.

[Means for solving problems]

S7-1 9 1 [yu] In the sheet transport system that transports the sheets separately, the first transport means that transports the sheets, and the first a first separating means for rejecting a sheet that follows the sheet conveyed by the feeding means; and a second feeding means for conveying the sheet being sent out while being separated by the first feeding means and the first llPa means. and a second separating means for rejecting the sheet following the sheet conveyed by the second feeding means to perform two-stage separation, and the first feeding means and the first separating means
The separating means, the second feeding means, and the second separating means have the same structure.

[Embodiments of the invention]

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

1. As shown in FIG. 1, an automatic document feeder r1175 is mounted on the platen 77 of an image processing apparatus, such as a copying machine 7, so that it can be opened and closed by a hinge.

The automatic document feeder 75 includes a document tray 207, a separation and feeding section 209 that separates the document set on the document tray 207 into one sheet, and sends out the document separated into one sheet.
a conveyance unit 211 that conveys the original sent out from 9 over the platen 77; a reversal ejection unit 213 that reverses and ejects the original after copying; and a storage unit that stores the original ejected from the reversal ejection unit 213. The document tray 215 is provided with a tray 215, so that originals are automatically fed into the tray 215.

Further, the conveying section 211 and the reversing ejecting section 213 are integrated with the cover C, and are attached to the back of the copying machine 7 via a hinge so that they can be opened and closed, and the cover C is opened upward together with the conveying section 211 and the reversing ejecting section g213. This allows the original to be set on the platen 77 by manual operation.

The separation and feeding section 209 is! ! As shown in Figure l't2, a sensor 201 detects whether or not a document Q is set in the paper feed port 217, a non-circular kick roller 219 that sends out the document Q set in the paper feed port 217, and a Paper mouth 2
A document presser 221 that presses the document inserted into the document feeder 17 against a kick roller 219 and a document feed path 222 formed by paper feed guides 218 and 220 are provided facing the document feed path 222, which rotates in the document conveyance direction. The feeding means of tjSl that conveys the original sent out by 219, for example, the feeding roller 253, rotates in the opposite direction to the conveying direction of the original,
A first separating means, for example, a separating roller 265, which rejects the original following the original being conveyed by the feeding roller 253; A second feeding means for conveying, for example, a feeding roller 257, and a second separation mechanism that rotates in a direction opposite to the conveying direction of the document and rejects the document that follows the document being conveyed by the feeding σ-roller 257. The means includes, for example, a separating roller 269, a sensor 203 that detects the leading edge of the document separated and sent out by the feeding roller 257 and the separating roller 269, and a registration roller 227 and a pressure roller 229 that registers the leading edge of the document. Note that the rollers 253, 257, 265, and 269 are, for example, rubber rollers.

The document holder 221 includes a first arm 245 that rotates around a pongee 243 and a second arm 249 that rotates around a shaft 247 provided at the distal end side of the first arm 245. , the tip of the first arm 245 presses the document against the kick roller 219, and the tip of the arm 249 of fjS2 presses the tip of the document.

The kick roller 219, the feed rows 2253, 257, and the separation rollers 265, 269 are driven by the motor M1 via a drive transmission mechanism. Further, the registration roller 227 is driven by a motor M2.

By the way, the coefficient of friction between the document and the feeding roller 253 is μ2, and the coefficient of friction between the document and the separation roller 265 is μ2,
If the coefficient of friction between the original and the feed row 2257 is μ1, the coefficient of open friction between the original and the separation roller 269 is μ, and the coefficient of friction between the originals is μ, then, for example, μ 1> μ 2> μ μ The friction coefficient is set so that the following relationships hold: 〉μ,〉μμm=μkoμ2=μ4.

Further, if the rotational speed of the feeding roller 253 is 1, the rotational speed of the separation roller 265 is 2, the rotational speed of the feeding roller 257 is v, and the rotational speed of the separation roller 269 is v4,
For example, the rotational speed is set so that the following relationship holds: V, > V2 V 3 > V 4 V + = V 3 V 2 = V −.

The conveying section 211 includes rollers 281 and 28 as shown in FIG.
71 conveying belt 285 stretched between 3 and pressure roller 2 that presses this conveying belt 285 against the platen 77.
87,289,291.29・1.

3 is provided.

The reversal discharge section 213 includes a reversal path 295 and a conveyance roller 2.
97,299, discharge sensor 300. Discharge roller 301.
303 is provided. Note that the roller 283, the conveyance roller 299, and the discharge roller 303 are driven by a motor M3.

Operation> With the above configuration, this device operates as follows.

In the initial state, the kick roller 219 is in the position shown in FIG. Further, the document presser 221 is raised.

When the original 8SQ is inserted into the paper feed port 17 with the copy side facing down, the sensor 201 detects the original Q by fabricating a primary vibration panel (not shown) and setting copying conditions.

When a print button (not shown) is pressed in this state, the motor M1 rotates. As a result, the peg 243 of the document holder 221 rotates clockwise in the figure, and the document holder 221 falls onto the document Q.

Therefore, the tip of the first arm 245 presses the document Q against the kick roller 219, and the tip of the second arm 49 presses the tip of the document.

Also, due to the operation of motor M1, kick low '7219,
Feeding rollers 253, 25? , separation roller 265.269
rotates. Therefore, the kick roller 219 sends out the document Q starting from the bottom sheet.

This original mQ is held between a feed roller 2253 that rotates in the transport direction and a separation roller 265 that rotates in the opposite direction to the transport direction. A separation row 2265 rejects the signal and performs primary separation.

The primary separated document Q is then subjected to secondary separation by a feeding roller 257 that rotates in the transport direction and a separation roller 269 that rotates in a direction opposite to the transport direction.

By the way, when the leading edge of the separated document Q is detected by the sensor 203, the motor M1 stops after a predetermined time T1.

Here, the predetermined time T1 is the original W! The tip of IQ is sensor 20
The time period is set to be sufficient for the document Q to come into contact with the rolling contact portion of the reno roller 227 and the pressure roller 229 after passing through the document Q 3, and to cause the document Q to bend.

Therefore, the leading edge of the bent document Q is rennosted.

A predetermined time T2 (T2
>TI) After that, the motor M2 is slightly rotated, and the leading edge of the document is held in the opening between the reno roller 227 and the pressure roller 229, and the document is placed on standby in a state where no deflection is eliminated.

When the copying preparation of the copying machine 7 is completed in this state, the motors M 1 and M 2 rotate, and the registration roller 227
, feeders 257 and 253 send out the original MQ, and the sent out original mQ is sent onto the platen 77. When the trailing edge of the original Q is detected by the sensor 203, the motor M2 stops, and the next original is fed out in the same manner as described above by the continued rotation of the motor M1, and the registration a-ra 2 .27 and the pressure roller 229 hold the leading edge of the document in their mouths.

On the other hand, the motor M3 rotates at the same time as the motor M2 rotates, and the document is conveyed over the platen 77 by the conveyance bell 285 and set at the reference position. Then, the i-photographing operation is performed.

When the copying is completed, the conveyor bell 285 rotates to send the document from above the platen 77 to the reversing path 295, where it is reversed and discharged. At this time, when the trailing edge of the document is detected by the sensor 300, the R document discharged from the 0 reversal path 295, through which the first document is sent onto the platen 77, is stored in the storage tray 215.

<Effects of the Heavenly Embodiment> According to this embodiment described above, the following effects can be obtained.

Since the feeding roller 253 and the separating roller 265, and the feeding roller 257 and the separating roller 269 are provided to perform 2151 degree separation, when the separating roller 265 is separating documents, the separating roller Further separation is performed at 269, and the separation performance of the original is improved, and the feeding roller 253 and separation roller 265 for primary separation and the feeding roller 257 and separation roller 269 for secondary separation are moved in both directions. -V# configuration, even if the double-fed sheet in the primary separation is separated and rejected by the separation roller 269 in the secondary separation, the separation row 2265 in the primary separation will be separated by the separation roller 269 in the secondary separation. They rotate at the same speed, and the sheet rejected by the separation roller 269 is directly sent rearward by the separation roller 265, making it difficult for the double-fed sheet to be damaged.

[Modified example]

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and, for example, the following modifications are possible.

(1) In the above embodiment, the sheet conveying device is applied to the separation and feeding section 203 of the automatic document feeder 75, but it can also be applied to the separation section of a large-capacity sheet feeding device that accommodates a large amount of copy paper to be supplied to a copying machine or the like. It can also be applied to

(2) First. Separation rollers 265 and 269 that rotate in the opposite direction to the conveying direction of the sheet are shown as separation means of $2, but separation may be performed using a friction member such as a fixed rubber roller or a rubber pad. ．． the second feeding means and the first feeding means; The second separating means may be a belt or the like.

(:() In the above embodiment, the feeding roller 253 and the separating roller 265, and the feeding roller 257 and the separating roller 26
9 are brought into contact with each other, however, a plurality of them may be provided on the same axis and arranged alternately in a non-contact state. Also, the contact state and non-contact state may be combined 6b.

Note that when in a non-contact state, they are provided so as to overlap each other in the diametrical direction.

(4) In the above embodiment, a device that feeds sheets from the bottom paper is shown, but the present invention can also be applied to a device that feeds sheets from the top paper.

〔Effect of the invention〕

As explained above, according to the present invention, in a sheet conveying device that separates and conveys a plurality of sheets into one sheet, the sheet conveying device includes a first feeding means for conveying the sheet, and a first feeding means for conveying the sheet. The first step is to reject the sheet that follows the sheet that is
a separating means, a second feeding means for conveying the sheet sent out while being separated by the first feeding means and the $1 separating means, and a second feeding means for following the sheet conveyed by the m2 feeding means. Since the second separating means for rejecting the sheets is provided to perform two-stage separation, the separation performance is improved and the first feeding means ′ and the first
Since the separating means, the second feeding means, and the second separating means have the same structure, double feeding occurs in the primary separation and separation occurs in the secondary separation.

It is possible to obtain a sheet conveying device in which the sheets are not easily damaged.

[Brief explanation of drawings]

Figures 151 to 12 are diagrams showing an embodiment of this invention.
Figure m1 is a cross-sectional view showing the structure of the automatic document feeder, and FIG. 2 is a cross-sectional view showing the structure of the separation feeding section of the automatic document feeder. 7... Copy machine 75... Automatic document feed')l? t
207... Document tray 209... Separation and feeding section 211... Conveyance section 213... Anti-paper discharge i
1s 219...Kick roller 221...
Document holder 227... Registration roller 229
... Pressure roller 25: (, 257 ... Feeding roller
265.269...Separation roller

Claims (9)

[Claims] (1) In a sheet conveying device that separates and conveys a plurality of sheets into one sheet, there is a first feeding means that conveys the sheet, and a sheet that follows the sheet conveyed by the first feeding means. a first separating means for displacing the sheet; a second feeding means for conveying the sheet separated by the first feeding means and the first separating means; and a sheet conveyed by the second feeding means. a second separating means for rejecting a sheet that follows a sheet following the sheet, and the first feeding means and the first separating means are the same as the second feeding means and the second separating means. A sheet conveying device characterized by having the following configuration. (2) In the sheet conveying device according to claim 1, the first feeding means and the first separating means, and the second feeding means and the second separating means are both A sheet conveying device characterized by contacting under the same conditions. (3) In the sheet conveying device according to claim 1, the first feeding means and the first separating means, and the second feeding means and the second separating means are A sheet conveying device characterized in that the same number of sheets are alternately arranged in contact with each other. (4) In the sheet conveying device according to claim 3, the first feeding means and the first separating means are arranged alternately, and the second feeding means and the second separating means are arranged alternately. A sheet conveying device characterized in that the separating means are provided so as to overlap each other by the same amount in a direction perpendicular to the sheet conveying direction. (5) In the sheet conveying device according to claim 1, the first and second separating means are the same rotating body that rotates in a direction opposite to the sheet conveying direction. Sheet conveyance device. (6) The sheet conveying apparatus according to claim 1, wherein the first and second separating means are the same fixed friction member. (7) In the sheet conveying device according to claim 1, the difference between the coefficient of friction of the first feeding means with respect to the sheet and the coefficient of friction of the first separating means with respect to the sheet and the coefficient of friction of the second feeding means with respect to the sheet. A sheet conveying device characterized in that the difference between the coefficient of friction of the feeding means and the coefficient of friction of the second separating means is made the same. (8) In the sheet conveying device according to claim 1, the sheet separation performance of the first feeding means and the first separation means, and the separation performance of the sheet by the first feeding means and the second separation means, A sheet conveyance device characterized in that the sheet separation performance of the separation means is the same for both. (9) In the sheet conveying device according to claim 1, the sheet conveying speed by the first feeding means and the first separating means, and the speed at which the sheet is conveyed by the first feeding means and the first separating means, A sheet conveying device characterized in that the sheet conveying speed by the separating means is the same for both sheets.