JPH06127722A - Original document separating-feeding device - Google Patents

Abstract

PURPOSE:To prevent the generation of skew and jam by installing an original document separating means and a restraining means which is installed on both the sides of the original document separating means and stops an original document bundle at a proper position when the original document is set so as to revolve in synchronization around a supporting means which supports these means. CONSTITUTION:The original document separating-feeding device of an automatic paper feeding device of a copying machine, etc., is equipped with a separating roller 3 as original document separating means, and each magnet stopper 6 as restraining means for stopping an original document bundle at a proper position when the original document is set is installed at both the sides of the separating roller 3 so that the double feed due to the pushing-up of the separating roller 3 by the top edge of the original document is not generated. In this case, the separating roller 3 and the magnet stopper 6 are made integral, and freely fitted on a shaft 8 so as to revolve relatively, and then frictional plates 12 and 13 are arranged on both the sides, and both 3 and 6 are frictionally engaged by the urging force of a spring 11. Accordingly, even if an original document in upwardly curled form is set, the stop of feed due to the restraint for the top edge of the original document by abrasive grains and the generation of skew and jam can be prevented.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art An automatic paper feeder used to feed an original to a reading position in a copying machine, a facsimile, a reading scanner for information input, etc. There is provided a mechanism for feeding the originals one by one by rotating the feed rollers in contact with each other, and a separation / feeding device having a mechanism for preventing double feeding by the feed rollers. In Japanese Utility Model Laid-Open No. 3-76834, there is a variation in the method of document setting by the user (for example, the method of setting in which the upper layer of many documents sticks out and the leading edge of the document becomes a reverse wedge shape). As a method for maintaining the original separating / conveying performance, stoppers (grinding stone stoppers) provided with abrasive grain layers exhibiting high resistance to sliding on the outer peripheral surface are arranged on both sides in the axial direction of the separating roller, and the feed roller and the feed roller are provided. A sheet feeding device that realizes document separation by cooperation with a separation roller is also disclosed, and this configuration is extremely effective for maintaining stable document separation / conveyance performance.

Further, in the conventional machine, as shown in the exploded view of the separation unit in FIG. 3, the separation roller 3 is rotatably supported around the shaft 8, but the grindstone stopper 6 is different from the separation roller 3. It was independent and was fixed to the shaft 8 with worms 9. That is, FIG. 4 is a block diagram of a separation unit according to the prior art, in which the grindstone stoppers 6 on both sides thereof are made of a spacer 10 or a compression spring 11, a metal and a 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 together with the rotation of the feed roller 2.

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

The above-mentioned proposal is effective in improving the document separating / conveying performance because the leading end of the document is caught by the fine convex projections on the surface of the grindstone stoppers 6 located on both sides of the separating roller 3 in the axial direction. Is to prevent the submersion under the separating roller and the stoppers on both sides thereof. If a stopper having a smooth surface such as a resin such as polyacetal is used instead of the grindstone stopper, the leading end of the original 5 is pressed by the resin stopper 7 and narrowed as shown in FIG. When the lowermost original 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 original bundle and separated from the feed roller 2, and at this time, three sheets or more. If the original document enters between the feed roller 2 and the separation roller, double feeding will occur. If a grindstone stopper is used instead of the resin stopper, the leading edge of the original will catch on a fine convex protrusion early, preventing the original tip from slipping under the stopper, so that the separation roller floats up due to the original bundle during document transportation. There is an advantage that it can prevent. However, in the case of an upward curled document, as shown in FIG. 7, the leading edge of the document 5 is naturally caught by a fine convex projection on the surface of the grindstone stopper 6, which causes non-feeding and document jamming.

[0006]

SUMMARY OF THE INVENTION According to the present invention, there are provided a separation roller which cooperates with a feed roller to separate and feed originals one by one from the lowermost original, and a separation roller which comes into contact with the leading edge of the original during setting. In a document separating / feeding device that is provided on both sides of a separation roller so that the leading edge of the document does not come into contact with each other, and that has a grindstone stopper that exhibits high resistance to sliding with the document,
An object of the present invention is to provide a document separating / feeding device capable of sufficiently maintaining the separating function even when a document having an upward curl is set.

[0007]

According to the present invention, an original conveying means for conveying an original, an original separating means for contacting the original conveying means to separate the original, and a leading end of the original located on both sides of the original separating means. In a document separating / feeding apparatus having a stopper for stopping the bundle of originals at an appropriate position when setting the originals so as not to cause a double feed by pushing up the separator, the stopper and the separator are It is configured so that it can be rotated in synchronization around the supporting means that supports, and the separating means and the stopping means are integrated so that the stopping means can rotate together with the rotation of the separating means. It is characterized by being configured.

[0008]

According to the present invention, since the grindstone stopper can be rotated together with the separating roller, even when a document with a leading edge curled upward is set, the abrasive grains on the surface of the grindstone stopper cause the nip of the document to move toward the nip. In order to guide in the direction (when there is one original in the nip, this action does not work because the separation roller does not rotate, but as long as there is an original in the nip, it does not normally feed. However, it is possible to prevent non-feeding due to the front end of the document being stopped by abrasive grains, document skew (the document is conveyed obliquely), and document jamming. Further, according to the present invention, since the grindstone stopper and the separation roller are integrated, the structure is simplified, and an inexpensive and high-performance document separating / feeding device can be provided.

[0009]

EXAMPLES The present invention will be described below with reference to examples. Note that the exploded view of FIG. 3 will also be referred to. FIG. 1 is a front view showing the configuration of an embodiment of the present invention, in which a separation roller (document separating means) 3 and a grindstone stopper (stopping means) 6 are integrated,
The rubber portion of the separating roller 3 and the abrasive grain portion of the grindstone stopper 6 are integrally rotatable with respect to the shaft (supporting means) 8 shown in FIG. That is, even when the upper curled document is set on the document table 4 as shown in FIG. 1, the document 5 is placed between the feed roller 2 and the separation roller 3.
When the feed roller (document conveying means) 2 is rotating in the feeding direction, the separation roller 3 is rotated by the feed roller 2 due to the friction coefficient of rubber-rubber, and the grindstone stopper 6 is also rotated integrally. , The surface of the abrasive grain guides (moves) the leading edge of the document toward the nip,
The effect of preventing non-delivery is created.

FIG. 2 shows a first embodiment of the separation unit of the present invention.
It is a figure showing two examples, and separation roller 2 and 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 are integrated in advance are loosely fitted to the shaft 8 so as to be rotatable relative to each other, and the friction plates 12 and 13 are arranged on both sides thereof, and further on one side. Has a structure in which a spacer 10 is attached and a spring 11 is attached 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 the abrasive grains to the cored bar of the separation roller 2, the cored bar and the grindstone stopper are separate parts, and they are synchronously rotated by fitting the spigot. A method of making it possible is also considered.

[0011]

According to the present invention, since the grindstone stopper can be rotated together with the separating roller, even if a document with a slight curl is set, the leading edge of the document is stopped by the abrasive grains and the document is not fed. It is possible to prevent the occurrence of skew (documents are conveyed obliquely) and document jams. Further, according to the present invention, since the grindstone stopper and the separation roller are integrated, the structure is simplified, and an inexpensive and high-performance document separating / feeding device can be provided.

[Brief description of 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 a tip of an upper curled document is being guided along a direction toward a nip portion.

FIG. 2 is a diagram showing an 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 by a potato 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 showing a behavior of a separating roller when a document is fed, where FIG. 5A is a case where there is no document in the nip, FIG. 5B is a case where there are two documents in the nip, and FIG. The figure which shows the state at the time of one sheet.

FIG. 6 is a diagram showing 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 edge of a document is caught by a convex protrusion on the surface of a whetstone stopper.

[Explanation of symbols]

1 Feed Roller, 2 Feed Roller (Document Feeding Means), 3 Separation Roller (Document Separating Means), 4 Document Loading Plate, 5 Documents, 6 Grindstone Stopper (Stabilizing Means), 7 Resin Stopper, 8 Axis (Supporting Means), 9 Potato screw, 10 spacer, 11 compression spring, 12 friction plate (resin), 13
Friction plate (metal).

Claims (2)

[Claims] 1. An original conveying means for conveying an original, an original separating means for abutting against the original conveying means to separate the original, and a front end of the original located on both sides of the original separating means pushes up the separating means to cause double feeding. In a document separating / feeding device having a stopper for stopping the bundle of documents at an appropriate position when setting the documents so as not to cause the above-mentioned problem, the stopper and the separator are the supporting means for supporting them. A document separating / feeding device characterized by being configured so as to be able to rotate in synchronization with the surroundings. 2. An original separating / feeding device, characterized in that the separating means and the stopping means are integrated so that the stopping means can be rotated together with the rotation of the separating means.