JPS5820860B2 - Paper feeding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding device, which is suitable for feeding documents to a facsimile machine.

Various types of automatic document feeders have been proposed in the past for feeding documents into facsimile machines. 2. Description of the Related Art A paper feeding device is known that is configured to send out originals sandwiched between the two by means of original feeding rollers.

In this type of paper feeder, the originals are separated in advance by the original holder, so the incidence of paper feeding errors is lower than with other types. When the document separated by the document holder is sent out by the paper feed roller, which is in contact over almost the entire width of the document holder at the part that protrudes from the gap, the contact area becomes excessive and Drag may occur, and double feeding errors may occur due to the generation of static electricity.

Furthermore, in such a case, if there are tears or folds in the leading edge or left and right corners of the originals, the originals may catch on each other, resulting in feeding errors such as double feeding, jamming, and skewing.

In view of the above-mentioned circumstances, it is an object of the present invention to provide a paper feeding device that makes effective use of a document holder, reduces the occurrence of feeding errors, and always reliably feeds paper.

According to the present invention, the present invention has a document mounting table G and a document holder, and a document feeder for feeding the document sandwiched between mutually adjacent nipping plates of the document holder by a document feed roller T. The paper device includes a plurality of clamping plates each having an opening in which the document feed roller is aligned and a large number of holes penetrating in the thickness direction to prevent close contact, and a plurality of clamping plates that are attached to one side edge of the clamping plate. Supporting means for supporting the holding plate in a manner that allows the holding plate to be opened and closed;
This is achieved by an apparatus characterized in that it includes a holding means that fixes the document holder made up of the clamping plate and the support means on the document table by engaging a part of the support means.

According to this configuration, the document is always fed by the document feed roller at the portion where it is held by the clamping plate number, so double feeding errors and document dragging do not occur.

In addition, if the original has defects such as tears, holes, wrinkles, or folds, when setting the original, pay attention to whether or not there is a defect in the part of the original that is located in the opening of the clamping plate, and By preventing a defective portion of the document from being located in the opening, it is possible to prevent feeding failures due to defective portions of the document.

Further, according to the present invention, the clamping plate that clamps the original is provided with a large number of holes penetrating through it to prevent close contact.
Air can easily flow in between the holding plate and the document through these holes.

Therefore, since the nipping plates and the original are prevented from coming into close contact with each other, the original can be reliably sent out from between the nipping plates.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a longitudinal sectional view showing one embodiment of a feeding device according to the present invention.

In this figure, reference numeral 1 indicates a document placement table, and side plates 2 are arranged on both sides of the document placement table 1.

The tip end 1a of the document mounting table 1 stands up at an angle with respect to the document feeding direction indicated by arrow a in the figure.
A lower guide plate 5 that constitutes a document path 4 together with the upper guide plate 3
There's one in a row.

An auxiliary separation roller T supported on a shaft 6 and a separation roller 9 supported on a shaft 8 are provided in the document path 4, with a portion of their circumferential surfaces protruding from each other.

The auxiliary separation roller T is rotated by a drive device (not shown) via a clutch mechanism 6a in a direction opposite to the document feeding direction, and the separation roller 9 is driven by a drive device (not shown). It is designed to be rotated in the same direction as the auxiliary separation roller 7.

A feed roller 10 is disposed above the separation roller 9 and rotates in the document feed direction.

The feed roller 10 and the separation roller 9 may be arranged so as to rotate while contacting each other, or each roller may be arranged as a chopping roller so that their circumferential surfaces are inserted into each other in the axial direction. It may be placed in

The feed roller 10 is fixedly supported on a shaft 11 rotatably supported between the side plates 2, 2, and is rotationally driven by a drive device not shown in the drawing.

The shaft 11 pivotally supports a portion near one end of an arm 12 bent in a dogleg shape, and this arm 12 rotatably supports a paper feed roller 14 by a shaft 13 at the other end, that is, the free end. There is.

A pulley 15 is fixed to the shaft 13, and a pulley 1γ is attached to the shaft 11 via a clutch mechanism 16.

Also, the bent portion of the arm 12 [here is the guide boo IJ1B,
19 and 20 are each rotatably provided.

An endless timing belt 21 is passed around the shaft 1, and the shaft 1
1 rotation is selectively transmitted to the paper feed roller 14 via a clutch mechanism 16.

The tip on the base end side of the arm 12 is pointed in a chevron shape,
The chevron portion 22 engages with a roller 26 of a stopper lever 25 which is pivotally supported by a shaft 23 and is applied with a clockwise rotational force by a spring 24 in the figure.

When one slope 22a of the chevron portion 22 and the roller 26 are engaged, the arm 12 is applied with a spring force in the counterclockwise direction in the figure by the stopper lever 25 around the shaft 11. On the other hand, when the other inclined surface 22b of the chevron portion 22 and the roller 26 are engaged, the arm 12 is temporarily held at the non-sheet feeding position, which is raised from the position shown in the figure. [It's happening]

An optical document detecting means 2T consisting of a combination of a light emitting element and a light receiving element is disposed at the exit of the document passage 4, that is, at the right end of the numbered iron.

When this detecting means 27 detects the leading edge of the document, it disconnects the clutch mechanisms 6a and 16 that respectively control the rotations of the auxiliary separation roller 1 and the feed roller 10, and when it detects the trailing edge of the document, it disconnects the clutch mechanisms 6a and 16, respectively. A signal connecting t16 is generated.

As shown in the figure, the original document mounting table 1 is capable of stacking a plurality of original documents S, and is also adapted to have a document holder 30 attached thereto.

As clearly shown in FIG. 2, the original holder 30 is attached to the side plate 2 through cutouts 2 at both ends.
8, a plurality of clamping plates 32, and one end of each of the clamping plates 32 is pivotally supported, and the support shaft 3
1 and two support wheels 33 that are substantially integral with each other.

The support shaft 31 and the support ring 33 constitute a support means for the clamping plate 32.

The holding plates 32 have varying lengths so that each holding plate can be easily turned over, and also prevents the original held between adjacent holding plates from coming into close contact with the holding plates. For this purpose, each clamping plate 32 is provided with a large number of fLs 34.

The clamping plate 32 also has a rectangular notch opening 35 in the center of its free end.

As shown in FIG. 1, this notch opening 35 receives the paper feed roller 14 when the original holder 30 is set on the original placing table. There is.

That is, in other words, the paper feed roller 14 is aligned with the notch opening 35 and always engages with the document held between the clamping plates at the notch opening 35.

When feeding a document using the paper feeder configured as described above, by engaging both ends of the support shaft 31 with one of the notches 28 serving as holding means, the document holder 30 is held in place of the document. The document S is placed between each clamping plate 32 of the document holder 30 with the arm 12 fixed on the mounting table 1 and lifted. After the work is completed, the arm 12 is
is pressed down to bring the paper feed roller 14 into contact with the document S at the notch opening 35 of the holding plate 32.

After that, when a start button (not shown in the drawing) of the feeding device is pressed, the auxiliary separation roller 7 and the separation roller 9 are activated.
゜The feed roller 10 and the paper feed roller 14 each rotate in the direction indicated by the arrow.

The document mounting table 1 is held between the clamping plates 32 of the document holder 30.
The topmost one of the stacked originals is placed on the clamping plate 3.
At a portion corresponding to the notch opening 351 of No. 2, the sheet is fed by the feed roller 14 in the direction t shown by arrow a in the figure.

This document passes through the tip 1a of the document placement table 1 and passes through the document path 4.
The document is then sent to the right in the figure by the feed roller 10 through the document path 4.

When sending out such documents, the auxiliary separation roller 7 and the separation roller 9 apply a kinetic force in the opposite direction to the document sending direction to the lower document in the unlikely event that multiple sheets of the document are sent together. , prohibits the original from being sent out at the same time as the upper original.

The paper feed roller 14 is constantly aligned with each notch opening 35 of the holding plate 32 until the uppermost original placed on the original document mounting table 1 and the lowermost original placed on the original table 1 are sent out. All the originals placed on the original placing table 1 are fed by the portions held by the holding plates 32.

Therefore, an excessive feeding force is not applied to the original document, and all the original documents are reliably fed by G.

In the ninth embodiment described above, the paper feed roller 14 was aligned with the notch opening 35 provided in the clamping plate 32, but the clamping plate 32 was arranged so that each of A rectangular opening 36 may be provided, and the paper feed roller 14 may be aligned with this opening 36.

Although the present invention has been described in detail with respect to specific embodiments above, the present invention is not limited to the embodiments described above, and various embodiments are possible within the scope of the present invention. will be clear to those skilled in the art.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical cross-sectional view showing one embodiment of a paper feeder according to the present invention, and FIGS. 2 and 3 are perspective views showing embodiments of a document holder used in the apparatus according to the present invention. 1... Document placement table, 7... Auxiliary separation roller, 9... Separation roller, 10... Feed roller, 14... Feeding Paper roller, 30...
...Document holder, 32...Holding plate, 35...
...notch opening, 36...opening.

Claims (1)

[Scope of Claims] 1. A document holder is provided on the document table, and a document feeding device that feeds the document held between two adjacent nipping plates of the document holder by a document feeding roller [thereby In this case, a plurality of clamping plates are provided with a plurality of grooves for preventing close contact, which penetrate in the thickness direction through the opening where the document feed roller is aligned, and a plate on one side of the clamping plate is engaged with the clamping plate. Then, a part of this support means is engaged with a supporting means for supporting the holding plate so as to be openable and closable, thereby fixing the document holder consisting of the holding plate and the support means on the document mounting table. A paper feeding device characterized by comprising a holding means for holding the paper.