JPH078347U - Paper feeder - Google Patents

Abstract

(57) [Abstract] [Purpose] Even if the fed-in sheet is conveyed while being curved and reversed along the separation roller, it does not hinder the smooth conveyance of the sheet by the separation roller. [Structure] A separation roller 5 and a separation pad 6 pressed against the outer peripheral surface of the separation roller 5 are provided. The separating roller 5 and the separating pad 6 cooperate to feed the originals G one by one and convey the fed originals G while reversing the curvature along the outer periphery of the separating roller 5. Auxiliary roller 1
8 is arranged so as to come into contact with the outer peripheral surface of the separation roller 5 so that it can freely rotate. The elastic restoring force of the original G due to the bending is
Even if it acts in a direction away from the separation roller 5, the fed-in document G is reliably brought into close contact with the outer peripheral surface of the separation roller 5 by the auxiliary roller 18 and does not float up from the outer peripheral surface. Therefore, the fed document G is smoothly conveyed as the separation roller 5 rotates.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device for feeding sheets such as originals one by one in a facsimile machine.

[0002]

[Prior art]

 As a document feeding device in a facsimile machine, there is one shown in FIG. 2, for example. As shown in the figure, a supply tray 22 for stacking and supporting the originals G is arranged above the apparatus case 21. A separating roller 23 is provided near the lower end of the supply tray 22, and as the separating roller 23 rotates, the separating roller 23 and the separating pad 24 cooperate with each other so that the document G on the supplying tray 22 is stored. It is separated and put in one by one. The fed document G is conveyed while being curved and reversed along the outer periphery of the separation roller 23 by being guided in the conveyance path 26 between the pair of guide plates 25, and is fed to a document reading unit (not shown). .

[0003]

[Problems to be solved by the device]

 However, as described above, when the fed document G is curved and reversed along the outer periphery of the separation roller 23, the elastic restoring force of the document G due to the curvature acts in a direction away from the separation roller 23, The document G is pressed against the inner wall of the guide plate 25 on the outer peripheral side. As a result, the curved and inverted original G does not come into sufficient contact with the outer peripheral surface of the separation roller 23, and a large sliding resistance is generated between the original G and the guide plate 25, so that the original G is smoothly moved by the separation roller 23. There is a problem that they may not be able to be transported. This problem becomes more remarkable when the original G is stiff, because the elastic restoring force of the original G due to the bending increases.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to separate a rolled-in sheet by conveying it while curving and reversing it along the separating roller. (EN) It is possible to provide a sheet feeding device that does not hinder the smooth conveyance of the sheet due to.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention has a separating roller and a separating member that is pressed against the outer peripheral surface of the separating roller, and cooperates with the separating roller to separate the sheet. In a sheet feeding device that conveys and conveys sheets one by one, an auxiliary roller is provided on the outer peripheral side of the separation roller to bring the conveyed sheets into close contact with the outer peripheral surface of the separation roller.

[0006]

[Action]

 Therefore, according to the present invention, the separating roller and the separating member cooperate to feed the sheets one by one. At this time, for example, even if the fed-in sheet is curved and reversed along the separating roller, the fed-in sheet is surely brought into close contact with the outer peripheral surface of the separating roller by the auxiliary roller. It is transported smoothly by the separation roller.

[0007]

【Example】

 An embodiment in which the present invention is embodied as a document feeder in a facsimile machine will be described in detail with reference to the drawings.

As shown in FIG. 1, a document G insertion port 2 is formed on the upper surface of the device case 1, and a document G ejection port 3 is formed on the rear surface (right side of FIG. 1) of the device case 1. ing. The supply tray 4 for stacking and supporting the original G is arranged in an inclined state at a position corresponding to the insertion opening 2 in the upper part of the device case 1.

The separation roller 5 is rotatably supported in the apparatus case 1 near the lower end of the supply tray 4. The separation pad 6 as a separation member is fixed inside the apparatus case 1 through a support plate 7 so as to face the separation roller 5, and is constantly separated by a leaf spring 8 so as to be pressed against the outer peripheral surface of the separation roller 5. It is urged toward 5. Then, as the separation roller 5 rotates, the originals G on the supply tray 4 are separated one by one from the lowermost original G by the cooperation of the separation roller 5 and the separation pad 6, and the apparatus case 1 Is rolled in.

A pair of upper and lower guide plates 9 and 10 are arranged in the apparatus case 1 between the insertion port 2 and the discharge port 3, and a conveyance path 11 for a document G is formed between the guide plates 9 and 10. There is. The upstream sides of both guide plates 9 and 10 are curved in an arc shape along the outer periphery of the separation roller 5, and the downstream sides thereof extend toward the discharge port 3. Then, the fed-in document G is guided into the conveyance path 11 and conveyed along the outer periphery of the separation roller 5 while being curved and inverted.

The reading window 12 is formed in the upper guide plate 9, and a light source 13 and an image sensor 14 are arranged inside the apparatus case 1 so as to face the reading window 12. Then, the light source 13 irradiates the original document G conveyed in the transport passage 11 with light through the reading window 12, and the reflected light from the original document G is guided through the reading window 12 to the image sensor 14, whereupon the original document G is read. The image on G is read.

A pair of feed rollers 15 are arranged on the downstream side of the guide plates 9 and 10. By the rotation of the feed rollers 15, the original G after image reading is fed, and the original G is ejected. It is discharged from the outlet 3 to the outside of the device case 1. The discharge tray 16 is supported by the apparatus case 1 below the discharge port 3, and the originals G discharged from the discharge port 3 are stacked and placed on the discharge tray 16.

A through hole 17 is formed in the curved portion of the lower guide plate 10 so as to face the outer peripheral surface of the separation roller 5. Then, the auxiliary roller 18 is arranged so as to come into contact with the outer peripheral surface of the separation roller 5 through the through hole 17, and can be idled.

In the document feeding device configured as described above, when the separation roller 5 is rotated, the documents G on the supply tray 4 are separated one by one from the lowermost document G, and the apparatus is placed. It is put into Case 1. Then, the fed document G is guided into the conveyance path 11 and conveyed along the outer periphery of the separation roller 5 while being curved and inverted.

At this time, even if the elastic restoring force of the document G due to the bending acts in the direction away from the separation roller 5, the fed-in document G is surely brought into close contact with the outer peripheral surface of the separation roller 5 by the auxiliary roller 18. Therefore, it does not float up from the outer peripheral surface. In this manner, in the state in which the curved document G is closely adhered to the outer peripheral surface of the separation roller 5 by the auxiliary roller 18, the original G is spread over a wide range of about half the outer peripheral surface of the separation roller 5. Are closely attached. That is, for example, as compared with the case where the original G is in close contact with the outer peripheral surface of the separation roller 5 only at the portion corresponding to the separation pad 6, the original conveyance force of the separation roller 5 can be improved. Therefore, the fed document G can be smoothly conveyed as the separation roller 5 rotates. Further, since the document G is not pressed against the inner wall of the lower guide plate 10, a large sliding resistance is not generated between the curved document G and the guide plate 10, and the document G Transport can be carried out more smoothly.

As shown by a chain line in FIG. 1, a feed roller 27 is normally arranged downstream of the separation roller 5 for feeding the document G in the conveyance path 11. However, as in this embodiment, if the original G is brought into close contact with the outer peripheral surface of the separation roller 5 by the auxiliary roller 18 and the separation roller 5 rotates, the original G can be reliably fed. The feed roller 27 can be omitted. Therefore, the structure can be simplified and the number of parts can be reduced, so that the manufacturing cost can be reduced.

The present invention is not limited to the above-described embodiment, and the configurations of the respective parts may be modified and embodied as follows, for example, without departing from the spirit of the present invention. (1) Arranging a plurality of auxiliary rollers 18 along the outer circumference of the separation roller 5. (2) The present invention is embodied in a device having a paper feeding mechanism other than a facsimile device, such as a printer or a copying machine.

[0018]

[Effect of device]

 As described above in detail, according to the present invention, even if the fed-in sheet is conveyed along the separation roller while being curved and inverted, the separation roller does not hinder the smooth conveyance of the sheet. Shows excellent effects.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing an embodiment in which the present invention is embodied as a document feeding device in a facsimile machine.

FIG. 2 is a partial cross-sectional view showing a conventional document feeding device.

[Explanation of symbols]

5 ... Separation roller, 6 ... Separation pad as a separation member, 1
8 ... Auxiliary roller.

Claims (1)

[Scope of utility model registration request] 1. A sheet feeding device having a separating roller and a separating member which is brought into pressure contact with an outer peripheral surface of the separating roller, and which cooperates with the separating roller to separate and convey sheets one by one. In the sheet feeding device, an auxiliary roller is provided on the outer peripheral side of the separation roller for adhering the fed sheet to the outer peripheral surface of the separation roller.