JPS62235145A - Sheet feed device - Google Patents

Abstract

PURPOSE:To minimize the possibility of influence of thicknesses of sheets during sheet separation, in a sheet feed device such as an automatic original feed device or the like for a copying machine, by alternately arranging feed and separating rollers in a noncontacting condition. CONSTITUTION:An original Q is nipped between feed and separating rollers 253, 265 in a noncontact condition. Further, the thus nipped original is conveyed by the feed roller 253 while another original following the original Q is expelled, that is, primary separation is effected. The original Q having been primarily separated is subjected to secondary separation by means of feed and separating rollers 257, 269. Since the feed roller 253 and the separating roller 265 are not make in contact with each other, they may easily nap an original irrespective of its thickness. Further, the overlapping amount between the rollers 253 and 265 is set such that they does not give any curl to the original and a thin original is bent into a corrugated form to have high firmness. Accordingly, an original may be easily napped between the rollers 257, 269.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is applicable to copying machines, laser printers, liquid crystal printers,
Sheet feeding devices that are attached to the sheet intake ports of image forming devices such as printing machines, and automatic document feeders that automatically feed documents onto the platen of image processing devices such as copying machines, facsimile machines, and image processing devices. The present invention relates to a sheet conveying device.

[Conventional technology]

Conventionally, an automatic document feeder installed in an image processing device such as a copying machine moves a document loaded on a document tray by, for example, a feed roller that rotates in the conveyance direction of the document and feeds the document, and a feed roller that rotates in the document conveyance direction and feeds the document by contacting the feed roller. A separation roller is provided, which rotates in the opposite direction to the direction in which the document is transported, and removes the document sent out by the feed roller.The document is separated and sent out one by one, and this document is sent onto the platen with a conveyance belt. When the original is set at the reference position and copying is completed, the original is ejected from the platen by a conveyor belt and stored in one ejection tray.

[Problem that the invention seeks to solve]

In such an automatic document feeder, since the feed row 2 and the separation roller rotate in opposite directions while in contact with each other, it is difficult to grip the document and the leading edge of the document is easily bent.

For this reason, if the feeding roller and separation roller are made non-contact, the leading edge of the document is less likely to break, but if the document is thin, the amount of overlap between the feeding roller and separation roller must be increased. If the two-bit amount is increased, in the case of a thick original, the original will have a curl. Therefore, since the overlap amount must be changed depending on whether the original is thin or thick, it is difficult to set the amount of overlap.

[Purpose of the invention]

An object of the present invention is to obtain a sheet conveying device that is hardly affected by the thickness of the sheet when separating the sheets.

[Means for solving the problem, α]

Therefore, the present invention provides a sheet conveying device that separates a plurality of sheets into one sheet and conveys the first sheet.
a separating means 191 for rejecting a sheet following a sheet conveyed by the first feeding means in a non-contact manner with the first feeding means;
A feeding means of P1%2 that conveys the sheet being sent out while being separated by the feeding means of Sl and the first separating means, and a feeding means of P1%2 that is in contact with this second feeding means and is conveyed by the second feeding means. The present invention is characterized in that a second separating means is provided for rejecting a sheet that follows the sheet being conveyed.

[Effect]

Therefore, the first feeding means! ! ! 'Since the $1 separating means is non-contact, it is easy to grip the sheet regardless of its thickness, and the amount of overlap between the first feeding means and the first separating means can be adjusted to suit thick sheets. Even if the amount is set so that it does not stick to the thin sheet, the first feeding means and fjS
Since the separation means i bends in a wave-like manner and becomes stiff, even if the second feeding means and the separation means @2 are in contact with each other, the sheet is likely to be caught between them, which prevents the separation of the sheets. There are fewer restrictions on sheet thickness.

[Embodiments of the invention]

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

Structure> rjS1 As shown in FIG. 1, an automatic document feeder fi75 is mounted on a platen 77 of an image processing apparatus, for example, a copying machine 7.

This automatic document feeder i75 includes a document tray 207,
A separation feeding unit 209 separates the original set on the original tray 207 into one sheet and sends it out, and the separation feeding unit 2
A reversing unit 210 that reverses the original sent from 09 or the original supplied from the platen 77, a transport unit 211 that transports the original on the platen 77, and the original that has been copied is discharged through the reversing unit 210. The storage tray 215 includes a paper ejecting section 213 for accommodating the document ejected from the paper ejecting section 213, and a storage tray 215 for accommodating the document ejected from the document ejecting section 213, so that the document can be ejected to the side from which the document was fed.

The separation feeding section 209 has a paper feeding port 2 as shown in FIG.
A sensor 201 detects whether the document Q is placed in the paper feed port 217, a non-circular kick roller 219, for example, that sends out the document Q set in the paper feed port 217, and
A kick roller rotates in the document transport direction and is provided facing the paper feed path 222 formed by the paper feed guides 218 and 220 and the document presser 221 that presses the document Q inserted into A first feeding unit, for example, a feeding roller 253, which conveys the original sent out by the feeding roller 219, rotates in a direction opposite to the feeding direction of the original, and rejects the original that follows the original fed by the feeding roller 253. The first separating means includes, for example, a separating roller 265, a feeding roller 253, and a separating roller 2, which rotates in the document conveyance direction.
Twelve feeding means, for example, a feeding roller 257, which transports the original that is sent out while being primarily separated by the feeding roller 65; For example, a second separating means for rejecting the original document that is separated by 26 separation rollers, a sensor 203 that detects the leading edge of the document that has been secondarily separated by the feeding roller 257 and the separation roller 269, and a sensor 203 that detects the leading edge of the document that has been sent out after being separated by the feeding roller 257 and the separation roller 269; It is equipped with a rhenostroller 227 that renostrits the tip of the.

Note that the rollers 253, 257, 265, and 269 are, for example, rubber rollers. Further, as shown in Fig. Pt53, the feeding roller 253 and the separating roller 265 are arranged alternately in a non-contact state. The feeding roller 253 and the separation row 2265 are provided to overlap in the diametrical direction. On the other hand, the feeding roller 257 and the separation roller 269 are provided in contact with each other.

The document holder 221 includes a first arm 245 that rotates around a pongee 243, and a second arm 249 that rotates around a pongee 247 provided at the tip 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 second arm 249 presses the tip of the document.

The reversing unit 210 includes a forward and reverse roller 2223, pressure rollers 225 and 229 that are in pressure contact with the forward and reverse roller 223, a reversing path 231 that switches back the document and reverses the document, and a sensor that detects the document. 232, a conveyance path switching kite 233, and a guide 235 that guides the original on the reversing path 231 onto the platen 77 and guides the original on the platen 77 to the reversing path 231.

The fine feed section 211 is attached to the rear surface of the copying machine 7 via a hinge so that it can be opened and closed, and the document can also be set on the platen 77 by manual operation.

As shown in FIG. 1, this conveying section 211 includes rollers 281.
A conveyor belt 285 stretched between the conveyor belts 283 and pressure rollers 287, 289, and 291 that press the conveyor belt 285 against the platen 77 are provided.

The paper ejection section 213 includes a paper ejection path 293 connected to the reversing path 231 , an elastic guide 294 such as a synthetic resin sheet that prevents the document conveyed through the paper ejection path 293 from entering the paper feed path 222 , and an ejection path 293 . A paper ejection sensor 295 for detecting a document to be transferred and paper ejection rollers 297 and 299 for ejecting the document are provided.

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

In the state of menarche, the kink roller 219 is in the position shown in FIG. Further, the document presser 221 is raised.

When the original fiHQ is inserted into the paper feed port 17 with the copy side facing up, the sensor 201 detects the original Q. Next, copy conditions are set by operating an operation panel (not shown).

When a print button (not shown) is pressed in this state, the sleeve 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 moves the document Q to the kick low 2.
219, and the four tips of the second arms are at g, W4
Hold the tip.

Further, the kick roller 219 rotates and sends out the document Q starting from the bottom sheet. This original IQ is gripped by a feeding roller 253 that rotates in the conveyance direction and a separation roller 265 that rotates in a direction opposite to the conveyance direction, which are in a non-contact state. and,
While conveying the loaded document with the feeding roller 253,
The document following this document is rejected by the separation row 2265 and
Next separation takes place. The original document Q that has been subjected to the primary division w1 is divided into two parts a by a feeding roller 257 that rotates in the transport direction and a separation roller 269 that rotates in the vertical direction (with respect to the transport direction).

By the way, when the leading end of the original MQ is detected by the sensor 203, the feeding rollers 253° 257 and the separating rows 2265, 269 are stopped after a predetermined time T1.

Here, the predetermined time T1 is from the time when the leading edge of the document Q passes the sensor 203 to the registration roller 227 and the forward/reverse rotation roller 2.
The time is set to be sufficient for the original mQ to come into contact with the rolling contact section 23 and deflect. Therefore, the tip of the original ff1Q, which is bent due to the secondary separation, is rennosted.

A predetermined time T2 (T
2 > T 1) After that, the forward and reverse rollers 223 are moved slightly 4'@ in the direction of the solid line arrow, and the leading edge of the document is held between the registration rollers 227 and the forward and reverse rollers 223, and the document is transported with no deflection. wait.

When copying preparations of the copying machine 7 are completed in this state, the forward/reverse rotation roller 223 and the feeding rollers 257, 253, which rotate in the direction of the solid line arrow, send out the original Q. This sent out document Q has elasticity between the id 294 and the forward/reverse (rotation) roller 22.
3, and is guided by a conveyance path switching guide 233 indicated by a broken line and supplied to a comparison path 231. When the rear end of the document in the conveyance direction is detected by the sensor 232, the conveyance path switching id 233 is switched as shown by the solid line, and the normal operation roller 223 is rotated in the direction of the broken line arrow. For this reason, the document is sent out with the t& end at the beginning, passing above the ID 235 and onto the platen 77.

Then, the original is transported over the platen 77 by the transport belt 285 and set at the reference position, and a copying operation is performed.

When the copying is completed, the conveyor belt 285 rotates in the reverse direction, and the document passes from above the platen 77 under the id 235.
When the document is sent to the path 231 and the trailing edge of the document is detected by the sensor 232, the conveyance path switching j-id 233 is switched and the forward/reverse rotation roller 223 rotates in the direction of the dashed arrow.

Therefore, the original is switched banked and supplied to the paper discharge path 293. When the trailing edge of the document Q is detected by the sensor 232, the next document on the document tray 207 is first fed out in the same manner as described above, and the leading edge of the document is held between the reno roller 227 and the forward/reverse roller 223. Wait for the document to be conveyed in this state.

The document supplied to the paper ejection path 293 is passed through the paper ejection roller 297
, 299 onto the storage tray 215. At this time, when the rear end of the original 8S is detected by the sensor 295, the previously delivered original is sent onto the platen 77.

<Effects of Example> According to this example described above, the following effects can be obtained.

(1) Since the feed roller 253 and separation roller 265, which perform the primary separation, are in a non-contact state, it is easy to hold the document regardless of the thickness of the document, and the feed roller 253 and separation roller 265 are not in contact with each other. - Set the balump amount to an amount that does not cause curls on thick originals, and in the primary separation, thick originals are easily separated, and thin I! '1. Even if it becomes difficult to separate the manuscripts,
Thin originals are bent in a wavy manner by the alternately arranged feeding rollers 253 and separation rollers 265, making them stiff, so even if the feeding rollers 257 and separation rollers 2269 are in contact, the originals may not be held between them. It becomes easy to be mixed in, and it is separated in the secondary stage. That is, there are fewer restrictions on the thickness of the original when separating the original.

(2) Since the feed roller 253 that performs the primary separation and the separation roller 265 are not in contact with each other, there is less resistance and it is easier to hold the document in its mouth (there is less chance of gaps occurring during engraving, and the feed roller 253 Since the secondary separation is performed by the feeding row 2257 and the separation roller 269 while being held in the separation roller 265, skew is difficult to occur even during the secondary separation.

(3) Since the feeding roller 253 and separation roller 265, which perform the primary separation, have little resistance against the original, it is possible to easily process the paper during printing even though two-stage separation is performed.

[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 the second separation means, but is it possible to use a fixed rubber roller or a rubber pad?
It may be separated into one member. Also, 1st. Second
feeding means and the first. The second separating means may be a belt or the like. Furthermore, rollers, belts, etc. may be combined. Further, when using a roller, it is not limited to a rubber roller, and a trousers roller or the like may be used.

(3) 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.

(4) In the embodiment described above, the feeding roller 257 and the separation row 2269 are brought into continuous contact, but they may be brought into contact at least only during separation.

〔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 first feeding means for conveying the sheet and the feeding means of this fjSl are connected in a non-contact manner. a first separating means for rejecting the sheet following the sheet conveyed by the first feeding means; and a sheet being separated by the first feeding means and the first separating means that are in non-contact with each other and sent out. a second feeding means for conveying the sheet to be transported, and a separating means of 52 ft. that contacts the second feeding means and rejects the sheet following the sheet conveyed by the second feeding means. Therefore, it is possible to obtain a sheet conveying device that is hardly affected by the thickness of the sheet when separating the sheets.

[Brief explanation of drawings]

Figures 1 to 3 are diagrams showing one embodiment of the present invention, in which Figure 1 is a cross-sectional view showing the configuration of an automatic document feeder, and Figure 2 is a sectional view of the separate feeding section of the VC position for automatic document feeding. A sectional view showing the configuration,
FIG. 3 is a diagram showing the arrangement of the feeding roller and separation roller. 7... Copy machine 75... Automatic document feeder 2
07... Original tray 209... Separation feeding section
210...Reaction section 211...Transportation section 213
...Paper discharge section 219...Kick low 2 221.
・Document holder 223 ・Forward/reverse rotation roller 22
7...Renos) o-ra 231...Reverse path
253°257... Feeding roller 265,269.
・Separation roller

Claims (6)

[Claims] (1) In a sheet conveying device that separates a plurality of sheets into one sheet and conveys the sheets, the first feeding means for conveying the sheet and the first feeding means are arranged in a non-contact manner to the first feeding means. a first separating means for rejecting a sheet that follows the sheet conveyed by the feeding means; and a second separating means for conveying the sheet that is sent out while being separated by the first feeding means and the first separating means that are in non-contact with each other. and a second separating means that contacts the second feeding means and rejects the sheet that follows the sheet conveyed by the second feeding means. Conveyance device. (2) The sheet conveying apparatus according to claim 1, wherein a plurality of the first feeding means and the first separating means are arranged alternately. (3) In the sheet conveying device according to claim 2, the first feeding means and the first separating means, which are arranged alternately, overlap in a direction perpendicular to the sheet conveying direction. A sheet conveying device characterized by being provided. (4) In the sheet conveying device according to claim 1, the first and second separating means are rotating bodies that rotate in a direction opposite to the sheet conveying direction. Device. (5) The sheet conveying apparatus according to claim 1, wherein the first and second separating means are fixed friction members. (6) The sheet conveying apparatus according to claim 1, wherein the second feeding means and the second separating means can be moved toward and away from each other.