JP3315736B2 - Document Separation Feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an automatic paper feeder used for feeding a document to a reading position in a copying machine, a facsimile, an information input reading scanner, and the like.

[0002]

2. Description of the Related Art In an automatic paper feeder used for feeding a document to a reading position in a copying machine, a facsimile, an information input reading scanner, or the like, a lowermost layer of a document bundle stacked on a document table or the like is used. A separation paper feeder is provided which includes a mechanism for feeding a sheet one by one by bringing a feed roller into contact with a document and rotating the same, and a mechanism for preventing double feeding by the feed roller. Japanese Utility Model Application Laid-Open No. 3-76834 discloses a method of setting originals by a user when there are variations in the manner in which the originals are set (for example, when the upper layer of a large number of originals sticks out and the leading ends of the originals form a reverse wedge shape). As a method for maintaining the document separation / conveyance performance, a stopper (grindstone stopper) provided with an abrasive layer exhibiting high resistance to slip on the outer peripheral surface is disposed on both axial sides of the separation roller, and a feed roller and a feed roller are provided. A paper feeder that realizes document separation by cooperation with a separation roller is disclosed, and this configuration is extremely effective in maintaining stable document separation and conveyance performance.

[0003] In the conventional machine, the separation roller 3 is rotatably supported around an axis 8 as shown in an exploded view of the separation unit in FIG. It was independent and was fixed to the shaft 8 with screws 9. That is, FIG. 4 is a configuration diagram of a separation unit according to the prior art, in which the whetstone stoppers 6 on both sides are made of spacers 10 or compression springs 11, metal and resin.
It has a structure independent of the separation roller 3 via the friction plates 12 and 13. That is, in the conventional structure, it is possible to assume that only the grindstone stopper 6 is stopped even when the separation roller 3 is rotated by the rotation of the feed roller 2.

FIG. 5 is a diagram showing the behavior of the separation roller.
As shown in FIG. 5A, when there is no document in the nip formed by the feed roller 2 and the separation roller 3, the separation roller 3 rotates together with the feed roller 2 due to a large friction coefficient between rubbers. When two originals 5 enter the nip as shown in FIG.
The document on the feed roller side is conveyed by the large friction coefficient between the rubber and the paper. However, since the friction coefficient between paper and paper is smaller than the friction coefficient between rubber and paper of the separation roller 3,
The document on the separation roller side and the separation roller remain stationary. FIG. 5C shows the movement of the separation roller 3 in a state where one document is contained in the nip portion.

The above proposal is effective in improving the document separating and conveying performance because the leading end of the document is caught by a fine convex protrusion on the surface of the grinding stone stopper 6 located on both axial sides of the separation roller 3, and Is prevented from getting under the separation roller and the stoppers on both sides of the separation roller. If a stopper having a smooth surface, such as a resin such as polyacetal, is used instead of a whetstone stopper, the leading end of the original 5 is pressed and narrowed by the resin stopper 7 as shown in FIG. When the lowermost document is conveyed by the feed roller 1 and the feed roller 2, the separation roller (coaxial with the resin stopper 7) is momentarily pushed up by the document bundle and separated from the feed roller 2. When the original enters the space between the feed roller 2 and the separation roller, double feeding occurs. If a whetstone stopper is used instead of a resin stopper, the leading edge of the document will catch on the small convex protrusion as soon as possible, preventing the leading edge of the document from slipping under the stopper. There is an advantage that can be prevented. However, as shown in FIG. 7, in the case of an upwardly curled original, the leading end of the original 5 is caught by a minute convex protrusion on the surface of the grindstone stopper 6, which causes non-feeding and the occurrence of original jam.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a separation roller which cooperates with a feed roller to separate and feed a document one by one from a lowermost document, and a separation roller which comes into contact with the leading edge of the document during setting. In a document separating and feeding device provided with a whetstone stopper which is installed on both sides of the separating roller so that the leading edge of the document does not contact and exhibits high resistance to sliding between the document,
An object of the present invention is to provide a document separating and feeding device capable of sufficiently maintaining a separating function even when a curled document is set.

[0007]

According to the present invention, a conveying means for conveying an original, a separating means for contacting the conveying means and separating the original, and a leading end located on both sides of the separating means to push up the separating means to load the original. In a document separating and feeding apparatus having a stopping means for stopping a bundle of documents at an appropriate position when setting a document so that feeding does not occur, the stopping means and the separating means may include:
That they are configured to rotate synchronously about the supporting means supporting them, and that the stopping means is formed integrally with the separating means and is rotatable with the same center of rotation. It is characterized by having.

[0008]

According to the present invention, the grindstone stopper can be rotated together with the separation roller, so that even if a document whose curl is slightly curled upward is set, the abrasive grains on the surface of the grindstone stopper cause the leading edge of the document to be nipped. This action does not work because the separation roller does not rotate when one document is in the nip, but it is usually not fed as long as the document is in the nip. It is not possible to prevent non-feeding, document skew (conveyance of the document obliquely), and document jam due to the front end of the document being stopped by the abrasive grains. Further, according to the present invention, since the grindstone stopper and the separation roller are integrated, the configuration is simplified, and an inexpensive and high-performance document separation and feeder can be provided.

[0009]

The present invention will be described below with reference to examples. It should be noted that the exploded view of FIG. 3 shown in the conventional example is also referred to. Figure 1 is a front view showing the structure of an embodiment of the present invention, by integrating the separation roller (separation means) 3 and the grindstone stopper (stop means) 6, the shaft support means 8 shown in FIG. 3 On the other hand, the rubber portion of the separation roller 3 and the abrasive portion of the grindstone stopper 6 are integrally rotatable. That is, even when the upper curled document is set on the document table 4 as shown in FIG.
No document 5, when rotating the feed roller (conveyance means) 2 is the feed direction between the rubber - separation roller 3 by the friction coefficient of the rubber is rotated together by the feed roller 2, the grinding wheel stopper 6 Also rotates together, the surface of the abrasive grains guides (moves) the leading edge of the document toward the nip portion, and a non-feed prevention effect is produced.

FIG. 2 shows one of the constitutions of the separation unit of the present invention.
FIG. 5 is a view showing two examples, in which a separation roller 2 and a whetstone stopper 6 are shown.
It is a side view which shows that and are integrated. That is, in this example, the separation roller 2 and the grindstone stopper 6, which have been integrated in advance, are loosely fitted to the shaft 8 so as to be relatively rotatable, and the friction plates 12, 13 are arranged on both sides thereof. Has a structure in which a spacer 10 and a spring 11 are assembled to the other. As for the integration of the separation roller 2 and the grindstone stopper 6, in addition to the method of directly attaching abrasive grains to the core of the separation roller 2, the core and the grindstone stopper are separate parts, and the synchronous rotation is performed by fitting the spigot. There is also a way to make it happen.

[0011]

According to the present invention, a grindstone stopper ( stopper )
It is possible to stage) is rotated together with the separation roller (separation means), even original curled upward slightly is set, the document leading edge is not sent and the document skew (document due to stopped by abrasive grinding wheel stopper The document can be prevented from being jammed. Further, according to the present invention, since the grindstone stopper and the separation roller are integrated, the configuration is simplified, and an inexpensive and high-performance document separation and feeder can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing a state in which a separation roller and a grindstone stopper are integrated according to the present invention, and the leading end of an upper curl document is to be guided in the direction of a nip portion by rotating.

FIG. 2 is a diagram showing one example of a configuration of a separation type unit of the present invention.

FIG. 3 is an exploded view showing that a grindstone stopper is fixed to a shaft with a pot screw independently of a separation roller in a conventional machine.

FIG. 4 is a configuration diagram of a conventional separation type unit.

5A and 5B are diagrams illustrating the behavior of a separation roller when a document is fed, where FIG. 5A illustrates a case where there is no document in the nip, FIG. 5B illustrates a case where there are two documents in the nip, and FIG. The figure which shows the state when there is one sheet.

FIG. 6 is a diagram illustrating a state in which a large number of originals are compressed and narrowed by a resin stopper.

FIG. 7 is a diagram showing a state in which the leading end of a document is caught on a convex protrusion on the surface of a grindstone stopper.

[Explanation of symbols]

1 feed roller, 2 a feed roller (conveyance means), 3
Separation roller (separation means), 4 platen 5 original, 6
Grindstone stopper (stop means), 7 resin stopper, 8
Shaft (support means), 9 pot screws, 10 spacer, 11 compression spring, 12 friction plate (resin), 13 friction plate (metal).

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B65H 3/52 B65H 3/06 G03G 15/00 H04N 1/00

Claims (2)

(57) [Claims] 1. A transporting means for transporting a document, a separating means for contacting the transporting means and separating the document, and a document feeder located on both sides of the separating means so that the leading edge of the document pushes up the separating means to prevent double feeding. In a document separating and feeding apparatus having a stopping means for stopping a bundle of documents at an appropriate position when setting a document, the stopping means and the separating means rotate synchronously around supporting means supporting them. And a document separation and feeding device. 2. A conveying means for conveying a document, a separating means for contacting at least a part of the conveying means and separating the document,
A document separating and feeding device having stopping means positioned on both sides of the separating means to stop the document bundle at an appropriate position when setting the document so that the leading edge of the document pushes up the separating means and does not cause double feeding; The stopping means is formed integrally with the separating means , and
A document separating and feeding device characterized in that it can be rotated with the same center of rotation .