JPH0829851B2 - Automatic paper feeder - Google Patents

Description

The present invention relates to an automatic paper feeder for paper such as originals.

[Prior Art] Conventionally, for example, in an automatic paper feeder for feeding a plurality of stacked originals one by one to a document reading portion in a facsimile machine, as shown in FIG. 13, the surface is made of sponge material. A separating roller 1 is provided and a rubber separating piece 2 is provided.
Is provided, one end of the separating piece 2 is supported by one end of the supporting piece 3, and the other end of the supporting piece 3 is rotatably supported by a shaft 4, and one end of the supporting piece 3 is pressed by an elastic member 5. Then, one end of the separation piece 2 comes into elastic contact with the separation roller 1. Further, an auxiliary roller 6 is provided so that when the original 7 is inserted, the auxiliary roller 6 comes into contact with the original at the lowest position of the original 7, as shown in FIG.

[Problems to be Solved by the Invention] However, in this conventional apparatus, for example, as shown in FIG. 14, when a document 7 is forcibly inserted, the leading end of the document 7 is formed into a wedge shape by the separation roller 1 and the separation piece 2. There is a problem that the separation piece 2 is separated from the separation roller 1 by entering the space of (1) and a plurality of originals 7 are simultaneously fed.

Further, as shown in FIG. 15, if the stacking amount of the originals 7 exceeds the allowable range, in this case also the separating piece 2 separates from the separating roller 1 and a plurality of originals 7 are simultaneously fed. there were.

Further, as shown in FIG. 16, when the original 7 is not sufficiently inserted, the feeding force of the original 7 by the auxiliary roller 6 is lost due to the frictional force between the original placing table 8 and the original 7, and the original 7 is fed. There was a problem that disappeared.

Therefore, according to the present invention, the insertion position of the paper can be surely positioned, so that the separation piece does not separate from the separation roller at the time of insertion of the paper, and the paper feeding force of the auxiliary roller can be increased to ensure the paper. The present invention intends to provide an automatic paper feeder capable of feeding one by one.

Further, the invention according to claim (2) is to provide an automatic paper feeding device capable of more surely feeding the sheets one by one.

Further, the invention according to claim (3) is to provide an automatic sheet feeding device capable of efficiently controlling the sheet feeding force of the sheet by the auxiliary roller.

Further, according to the invention described in claim (4) and the invention described in claim (5), when the stacking amount of the stacked sheets exceeds the allowable stacking amount, it can be detected and can be notified, and more reliable sheet The present invention aims to provide an automatic paper feeding device capable of feeding.

[Means for Solving the Problems] The invention according to claim (1) is an automatic paper feeding device that feeds a plurality of sheets, which are stacked and inserted, by frictionally separating the sheets one by one, and one end is rotatable. A sheet insertion preventing member that is supported by the shaft and has a one-way clutch in the bearing portion to prevent excessive insertion of the sheet at the other end; rotating means for rotating this preventing member at the time of feeding; An auxiliary roller for transferring the lowermost sheet to the contact portion between the separation roller and the separation piece elastically contacting the separation roller, and a weight that is arranged to oppose the auxiliary roller so as to be vertically movable via the sheet. There is provided a roller and a weight roller driving unit that is positioned above the sheet so that the weight roller is separated from the sheet when the sheet is not fed and that is moved downward so that the sheet is placed on the sheet when the sheet is fed.

The invention according to claim (2) is the automatic paper feeding device according to claim (1), in which an auxiliary separating piece having a fulcrum different from that of the separating piece and elastically contacting the separating roller at the same portion as the separating piece is provided. It is provided.

According to a third aspect of the present invention, in an automatic sheet feeder for feeding a plurality of sheets inserted by laminating a plurality of sheets by frictionally separating the sheets one by one, one end thereof is rotatably supported and a bearing portion is provided. A one-way clutch is provided to prevent the paper from being over-inserted at the other end, a rotation means for rotating this prevention member at the time of feeding, and a separation roller for separating the lowest paper at the time of feeding. An auxiliary roller that is moved to a contact portion of the separation roller that elastically contacts the separation roller; a weight roller that is vertically opposed to the auxiliary roller with a sheet interposed therebetween; a separation roller and the separation piece. A paper detection sensor that is provided at or near the contact area or downstream of where the paper is fed, and detects the paper, and the weight roller is usually positioned above to separate from the paper. Does not detect the paper The can weight roller is provided with a weight roller driving means for moving downward so as to put on the paper.

According to a fourth aspect of the present invention, in an automatic paper feeding device that feeds a plurality of sheets that are stacked and inserted by frictionally separating the sheets one by one, one end thereof is rotatably supported and a bearing portion is provided. A one-way clutch is provided to prevent the paper from being over-inserted at the other end, a rotation means for rotating this prevention member at the time of feeding, and a separation roller for separating the lowest paper at the time of feeding. An auxiliary roller that is moved to a contact portion of the separation roller that comes into elastic contact with the separation roller, a weight roller that is vertically opposed to the auxiliary roller via a sheet, and a weight roller when not feeding. The paper is preliminarily detected by detecting the position of the weight roller that moves the weight roller downward so as to be separated from the paper, and moves the weight roller downward so that the weight roller is placed on the paper during feeding. Set allowable product It is provided with a laminated amount detecting means for detecting whether or not exceeded the amount.

The invention according to claim 5 is, in the automatic sheet feeding device according to claim 4, informed when the stacking amount of sheets detected by the stacking amount detecting means exceeds a preset allowable stacking amount. Means are provided.

[Operation] In the invention described in claim (1), when a sheet is inserted, the leading end of the sheet is blocked by the sheet insertion blocking member, and the insertion is positioned. Therefore, the leading edge of the paper does not reach the separation piece. Then, at the time of feeding, the sheet insertion blocking member is rotated by the rotating means to release the blocked state of the sheet. Then, when the auxiliary roller is operated, the sheets are transferred one by one from below to the contact portion between the separation roller and the separation piece. At this time, since the weight roller is placed on the sheet on the auxiliary roller, the frictional force between the auxiliary roller and the sheet, that is, the feeding force increases, and the sheet is reliably transported.

Further, in the invention described in claim (2), when the stacked amount of the inserted sheets is extremely large, a plurality of sheets are transferred to the contact portion between the separation roller and the separation piece at one time by the operation of the auxiliary roller. There is a risk that When such a situation occurs, the separation piece may be separated from the separation roller and the sheets may be fed in a double manner. The auxiliary separation piece supplements the separation piece to prevent double feeding.

Further, in the invention according to claim (3), the weight roller is usually located at a position separated from the sheet, and the sheet is transported only by the auxiliary roller. However, if the sheet is not conveyed by the auxiliary roller only, the sheet detection sensor detects that the sheet is not conveyed and the weight roller is placed on the sheet. Therefore, the frictional force of the sheet feeding by the auxiliary roller is increased, and the sheet is reliably fed.

Further, in the invention described in claim (4), it is possible to detect that the stacking amount of the inserted sheets may exceed the allowable stacking amount.

Further, in the invention described in claim (5), it is possible to detect and inform that there is a case where the loading amount of the inserted sheets exceeds the allowable loading amount.

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

In FIGS. 1 and 2, reference numeral 11 denotes a separation roller having a surface made of a sponge material and rotatably provided on a rotating shaft 12,
Reference numeral 13 is a rubber separating piece 13 whose one end is supported by one end of the supporting piece 14 with respect to the supporting piece 14 and whose other end is fixed to the other end of the supporting piece 14. The other end of the support piece 14 is rotatably supported by a shaft 15, and one end of the support piece 14 is pressed by an elastic member 16 to bring one end of the separation piece 13 into elastic contact with the separation roller 11.

Reference numeral 17 designates one end rotatably supported by a shaft 18 and a one-way clutch 19 in its bearing portion, and the other end portion when a manuscript 20 which is a plurality of laminated sheets is inserted.
A paper insertion blocking member keyed so as to prevent the leading end of 20 from being inserted too much, 21 is an auxiliary roller that interlocks with the separation roller 11, and 22 is a document 20 between the auxiliary roller 21 and the auxiliary roller 21. It is a weight roller that is provided so as to be movable up and down.

The weight roller 22 is moved up and down by an arm 25 connected to a plunger 24 that moves forward and backward by a solenoid 23. When the solenoid 24 sucks the plunger 24, the arm 25 rotates clockwise to move the weight roller 22. It is designed to be lowered. That is, the solenoid 2
3, the plunger 24 and the arm 25 constitute a weight roller driving means.

Reference numeral 26 is a motor constituting a drive source, and the power of the motor 26 is applied to drive rollers 28 and 29 for moving the document 20 sent from the separation roller 11 on the scanner unit 27 and the separation roller 11. .

Power from the motor 26 is transmitted to the separation roller 11 via an electromagnetic clutch 30, and rotation of the separation roller 11 is controlled at a predetermined timing during feeding. Therefore, the auxiliary roller 21 that is interlocked with the separation roller 11 is also operated at the same timing.

Reference numeral 31 denotes a document insertion detection sensor that detects insertion of the document 20.

In this embodiment having such a structure, when a plurality of stacked originals 20 are inserted, the originals 20 are inserted as shown in FIG.
The leading end of the sheet comes into contact with the other end of the sheet insertion preventing member 17 to prevent further insertion and positioning is performed. And manuscript 20
The document insertion detection sensor 31 detects the insertion of the document.

Then, the motor 26 operates and the sheet insertion blocking member 17 moves to the fourth position.
As shown in the figure, it rotates counterclockwise and comes into contact with the shaft 12. When they abut, the one-way clutch 19 acts to idle.

At this time, the separation roller 11 and the auxiliary roller 21 are electromagnetic clutches.
It is stopped because gear transmission is blocked by 30.

When the energization of the solenoid 23 is started in this state, the plunger 24 is attracted, the arm 25 is rotated clockwise as shown in FIG. 5, and the weight roller 22 is lowered to be placed on the document 20. At the same time, the electromagnetic clutch 30 is energized and the power of the motor 26 is transmitted to the separation roller 11 and the auxiliary roller 21.

Documents stacked in this way by the rotation of the auxiliary roller 21
The lowest document of 20 is first sent to the contact portion between the separation roller 11 and the separation piece 13, and then is fed from the separation roller 11 to the scanner unit 27 through the drive roller 28 to read the document. . The originals stacked in this way are sequentially separated and fed to read the originals, and when the separation and feeding of the final original 20 is completed, the motor 26 is rotated in the reverse direction.
As shown in the figure, the sheet insertion blocking member 17 is rotated clockwise by an angle φ to return to the original position, and is ready for the next feeding. The weight roller 22 also returns to its original position by stopping the energization of the solenoid 23.

In this way, the insertion position of the document 20 is determined by the sheet insertion blocking member 17 so as to be always at the predetermined position. Therefore, even if the document 20 is forcibly inserted, the leading end of the document is separated from the separation roller 11 and the separation piece 13. Will not be pushed into the contact area. Therefore, the document 20 is separated by the auxiliary roller 21 into the separation roller 11
The sheets are surely fed one by one to the contact portion between the separating piece 13 and the separating piece 13. Further, since the weight roller 22 is placed on the original when the original is fed, the frictional force between the auxiliary roller 21 and the original 20 becomes larger, and therefore the feeding force of the original 20 by the auxiliary roller 21 becomes larger. Even if the document 20 is not sufficiently inserted, the document 20 can be reliably fed to the separation roller 11.

Thus, it is possible to surely automatically feed the documents 20 one by one.

Next, another embodiment of the present invention will be described with reference to the drawings.
The same parts as those in the above-described embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 7, the separation piece 13 is separated from the separation piece 13.
An auxiliary separation piece 41 having a rotation fulcrum different from that of is provided, and one end of the auxiliary separation piece 41 is brought into elastic contact with the separation roller 11 at the same portion as the separation piece 13.

In this embodiment having such a structure, when the originals 20 to be inserted are loaded too much, the friction between the sheets becomes large, and a plurality of originals are simultaneously sent to the separation roller 11 by the rotation of the auxiliary roller 21. There is a risk of being. When such a situation occurs, the separation piece 13 will separate from the separation roller 11. However, even if the separating piece 13 is separated, the auxiliary separating piece 41 compensates for it, so that the document 20 is simultaneously separated into plural sheets by the separating roller 11
It is possible to prevent the sheet from being fed from the scanner unit 27. Thus, it becomes possible to more reliably feed the originals one by one.

Further, as shown in FIG. 8, a paper detection sensor 51 for detecting the passage of the original 20 is provided at the contact portion between the separation piece 13 and the separation roller 11, and the solenoid 15 is not always energized at the start of feeding. The sheet detection sensor 51 is energized only when it does not detect the passage of the document.

In the present embodiment having such a configuration, the weight roller 22 is normally located at an upper position apart from the document 20. Therefore, in this state, the originals 20 are sent one by one to the separating roller 11 only by the operation of the auxiliary roller 21.

If the document 20 is not delivered, the paper detection sensor 51 does not detect the passage of the document, so that the solenoid 23 is energized for the first time, and the arm 25 rotates clockwise as shown in FIG. Then, the weight roller 22 is placed on the document 20. In this way, the frictional force between the auxiliary roller 21 and the original 20 is increased, and the original is surely separated by the separating roller 11.
Will be sent to.

Since the control of placing the weight roller 22 on the document 20 is performed only when the document is not fed to the separation roller 11 in this way, the number of energizations to the solenoid 23 can be reduced and the solenoid 23 can be used. The heat generation can be kept low. Also, the plunger 24 by the solenoid 23,
By reducing the number of operations of the arm 25 and the weight roller 22, the generation of noise can be prevented as much as possible.

As shown in FIGS. 10 and 11, a light shielding member 62 is provided at one end of the shaft 61 supporting the weight roller 22, and the light emitting element and the light receiving element are arranged to face each other with the light shielding member 62 interposed therebetween. A light transmission type sensor 63, which is a load detection means, is arranged.

And the light transmission type sensor 63 is operated at the timing when the solenoid 23 operates, and when detecting the light transmission at that time, the detection output is sent to the display device 64 which is a notification means,
The display device 64 is made to display a warning message, for example, "many originals".

In the present embodiment having such a configuration, when the stacking amount of the original document 20 is within the preset allowable stacking amount, the solenoid 23 is energized and the plunger 24 rotates the arm 25 in the clockwise direction. When the weight roller 22 descends and is placed on the document 20, the light blocking member 62 is in a position to block the light from the light emitting element of the light transmissive sensor 63 as shown in FIG. Therefore, even if the light transmission type sensor 63 operates, the light from the light emitting element does not reach the light receiving element.

However, if the load amount of the document 20 may exceed a preset allowable load amount, a weight roller placed on the document 20 may be used.
Since the position of 22 is high, the light shielding member 62 does not descend to a position for shielding the light transmitted from the light emitting element of the light transmissive sensor 63 to the light receiving element as shown in FIG. 12 (b). Therefore, when the light transmission type sensor 63 operates, the light from the light emitting element is received by the light receiving element, and it is detected that the stacking amount of the document 20 exceeds the allowable stacking amount. Then, the detection output is supplied from the light transmissive sensor to the display device 64, and the display device 64 displays "many originals". As a result, the operator knows that the amount of stacked documents is too large, and reduces the number of documents 20 to be within the allowable stacking amount.

In this way, when the stacking amount of documents exceeds the allowable stacking amount, it is detected and notified, so that the stacking amount of documents can always be kept within the allowable stacking amount. It is possible to prevent the trouble that the paper is fed between the separation roller 11 and the separation piece 13 and a plurality of originals are simultaneously fed to the scanner unit 27 side.

In the present embodiment, a light transmission type sensor is used as the load amount detecting means, but the present invention is not necessarily limited to this, and other types of sensors such as switches such as micro switches and magnetic sensors are used. May be Further, in the above-mentioned embodiment, the one using the display device as the notification means has been described, but the present invention is not limited to this, and a buzzer or the like may be used.

It should be noted that each of the above-described embodiments has been described as being applied to a device for automatically supplying an original and reading it by a scanner, but the present invention is not necessarily limited to this. For example, an automatic paper feeding device for a copying machine or a laser printer. And so on.

[Effect of the Invention] As described in detail above, according to the present invention, it is possible to reliably position the insertion position of the paper, so that the separation piece does not separate from the separation roller when the paper is inserted, and the paper is fed by the auxiliary roller. It is possible to provide an automatic paper feeding device capable of increasing paper strength and reliably feeding paper one by one.

[Brief description of drawings]

1 to 6 show an embodiment of the present invention. FIG. 1 is a side view of a main part, FIG. 2 is a plan view of the main part, and FIGS. 3 to 6 are for explaining the operation. Partial side views of FIGS.
FIG. 12 shows another embodiment of the present invention. FIGS. 7 to 9 are partial side views, FIG. 10 is a plan view of relevant parts, FIG. 11 is a partial side view, and FIG. 13 is a partial perspective view showing the positional relationship between the light transmission type sensor and the light shielding member with respect to the amount, FIG.
FIG. 16 is a partial side view showing a conventional example. 11 ... Separation roller, 13 ... Separation piece, 17 ... Paper insertion blocking member, 19 ... One-way clutch, 20 ... Original, 21 ...
Auxiliary roller, 22 …… Weight roller, 23 …… Solenoid, 24
...... Plunger, 25 …… Arm, 26 …… Motor.

Claims (5)

[Claims] 1. An automatic paper feeder for frictionally separating and feeding a plurality of papers inserted by laminating a plurality of papers, one end of which is rotatably supported, and a bearing portion of which is provided with a one-way clutch. A sheet insertion blocking member for preventing excessive insertion of the sheet at the other end, a rotating means for rotating the blocking member at the time of feeding, a separation roller for the lowermost sheet at the time of feeding, and elastic contact with the separation roller. Auxiliary roller that is moved to the contact portion with the separating piece, a weight roller that is vertically opposed to the auxiliary roller via the paper sheet, and a weight roller from the paper sheet when not feeding. An automatic paper feeding device, characterized in that a weight roller driving means is provided which is positioned above to be separated and moves downward so that the weight roller is placed on the sheet at the time of feeding. 2. The automatic paper feeder according to claim 1, further comprising an auxiliary separating piece having a fulcrum different from that of the separating piece and elastically contacting the separating roller at the same portion as the separating piece. Automatic paper feeder. 3. An automatic paper feeder for frictionally separating and feeding a plurality of sheets of paper, which are inserted by laminating a plurality of sheets, one end of which is rotatably supported and a bearing portion is provided with a one-way clutch. A sheet insertion blocking member for preventing excessive insertion of the sheet at the other end, a rotating means for rotating the blocking member at the time of feeding, a separation roller for the lowermost sheet at the time of feeding, and elastic contact with the separation roller. The auxiliary roller that is moved to the contact portion with the separating piece, the weight roller that is vertically opposed to the auxiliary roller with the sheet interposed therebetween, and the contact portion between the separating roller and the separating piece. Alternatively, a sheet detection sensor that is provided in the vicinity of the downstream side where the sheet is fed from the contact portion and detects the sheet, and the weight roller is normally positioned above to separate from the sheet, and the sheet detection sensor during feeding Detects the paper Automatic feeding device, characterized in that the weight roller is provided with a weight roller driving means for moving downward so as to put on the paper when no. 4. An automatic paper feeder for frictionally separating and feeding a plurality of papers inserted by laminating a plurality of papers, one end of which is rotatably supported and a bearing portion of which is provided with a one-way clutch. A sheet insertion blocking member for preventing excessive insertion of the sheet at the other end, a rotating means for rotating the blocking member at the time of feeding, a separation roller for the lowermost sheet at the time of feeding, and elastic contact with the separation roller. Auxiliary roller that is moved to the contact portion with the separating piece, a weight roller that is vertically opposed to the auxiliary roller via the paper sheet, and a weight roller from the paper sheet when not feeding. Weight roller driving means for moving the weight roller downward so that the weight roller is placed on the sheet at the time of feeding, and the downward movement position of the weight roller is detected to detect the sheet. Is set in advance Automatic feeding device, characterized in that provided stacked amount detection means for detecting whether or not exceeds the allowable stacking amount that is. 5. The automatic sheet feeding device according to claim 4, further comprising an informing unit for informing when the stacking amount of sheets detected by the stacking amount detecting unit exceeds a preset allowable stacking amount. An automatic paper feeder.