JP3073085B2 - Paper feed mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeding mechanism for feeding a plurality of originals stacked on a chute one by one from a top surface by a pick roller.

[0002] When a double feed occurs in which a plurality of originals are fed in a state of being overlapped, a part of read data is lost. For this reason, it is desirable that the paper feeding mechanism has a configuration in which double feeding is as difficult as possible.

In order to prevent double feeding from occurring, it is necessary to increase the separating ability for separating the uppermost original from the lower original.

[0004] Although the above-mentioned separation ability can be increased by using the air adsorption type, the mechanism is complicated, large, and expensive.

Therefore, it has been desired to realize a sheet feeding mechanism having a simple structure and a large separating ability.

[0006]

FIG. 13 shows a conventional paper feed mechanism 1 as an example.

In the figure, reference numeral 2 denotes a pick section, and 3 denotes a separation section.

Reference numeral 4 denotes a pick roller and reference numeral 5 denotes a separator roller. The belt is driven by a motor 6 and both are rotated clockwise.

Reference numeral 7 denotes a shooter on which a plurality of originals 8 are stacked.

Reference numeral 9 denotes a spring for pushing up the shooter 7.

Reference numeral 10 denotes a gate which acts on a document below the uppermost document and restricts the document from being sent.

A pad 11 is pressed against the separator roller 5 by a spring 12.

The upper surface 8 c of the document 8 is pressed against the pick roller 4 by the spring force of the spring 9.

When the motor 6 is driven, the pick roller 4
Then, the separator roller 5 rotates clockwise, and the original document 8-1 at the uppermost position is picked by the pick roller 4, sent out over the gate 10, and sent to the separation unit 3.

The separating section 3 separates the originals when the originals are multi-fed, and only the uppermost original 8-1 is sent out into the transport path 13.

[0016]

Although the separating section 3 has a function of preventing double feeding, considering the reliability of the separating section 3 and the like, it is necessary to minimize the occurrence of double feeding in front of the separating section 3. It is desirable.

That is, firstly, the originals are sent out from the chute 7 in a state where they are separated from each other. Secondly, even when a plurality of originals are sent out, before reaching the separation section 3, It is desirable to restrict conveyance of a document other than the document at the uppermost position.

In view of the above-mentioned conventional paper feed mechanism 1 from the above viewpoint, the original 8 is kept stacked on the chute 7 without any separation, that is, the burrs or perforations on the end face when the original is cut. It is pressed against the pick roller 4 with the effect of the burr remaining. For this reason, the uppermost original 8-1
And the lower document may be sent out integrally.

Since the gate 10 is merely a metal plate, the gate 10 has a small ability to separate the originals sent from the shooter 7 in an overlapping state.

For this reason, a plurality of originals are often sent to the separating section 3 in a state of being overlapped with each other. In some cases, the originals may be double-fed in the transport path, and the reliability is not sufficient. Was not.

[0021]

According to a first aspect of the present invention, there is provided a feeder having a configuration in which a plurality of sheets stacked on a chute are sent out from an upper surface side by a pick roller, and the fed sheets are separated and sent out one by one. A paper mechanism, wherein the hopper is provided rotatably about the shooter side, and is located at a first position on the extension of the shooter and supports a sending-out side portion of the stacked plurality of sheets; , Plate members and
A mechanism for rotating the plate member, the tip of the plate member
Side locks the tip side of the hopper, and the plate member and the hopper
Are arranged so as to form a V-shape to feed the paper.
At this time, the plate member is rotated, and the plate member and the
When feeding the paper, the hopper is rotated from the first position to the second position while the angle between the hopper and the paper is increased, and the feeding side portion of the paper is pushed up to pick up the upper surface. And a hopper rotating means for pressing the roller.

According to a second aspect of the present invention, in the paper feed mechanism, a plurality of sheets stacked on the chute are sent out from the upper surface side by a pick roller, and the fed sheets are separated and sent one by one. A hopper that is rotatably provided about the side and is at a first position on the extension of the chute and that supports a delivery side portion of the plurality of stacked sheets; a plate member and the plate; Rotating member
And the leading end side of the plate member is
The leading end side is locked, and the plate member and the hopper form a V-shape.
The above-mentioned plate part is
When the material is rotated, the angle between the plate member and the hopper becomes
While feeding the paper, the hopper is rotated from the first position to the second position while feeding the sheet,
A hopper rotating means for pushing up the sending side portion of the sheet and pressing the upper surface against the pick roller, and a friction member provided at a portion where the sheet sent from the shooter gets over.

[0023]

According to the first aspect of the present invention, when the plate member is rotated,
When the hopper rotates to the second rotation position, the plate member and the hopper are rotated.
The angle between the paper and the paper
The paper is bent because only the sending side of the paper is pushed up
And the paper on the upper side of the
Forward in the paper feed direction, and the feed side naturally forms a wedge
Forms, the end face of the paper is stepped, and the paper is
The paper is separated one by one,
Is prompted.

In the invention according to claim 2, the plate member is turned.
It is in hopper when rotated to a second rotational position, the plate member
And the angle between the hopper and
Only the sending side of the paper is pushed up and the paper
It is bent and used for the upper side
The paper advances further in the paper feed direction, and the feed side naturally
Form the shape, the end face of the paper is stepped, and the paper is
And the paper is separated one by one.
Separation is encouraged. The friction member acts on a sheet below the uppermost sheet and generates a friction force acting in a direction opposite to a direction in which the sheet is fed.

[0025]

FIG. 1 shows a sheet feeding mechanism 20 according to an embodiment of the present invention, and FIG. 2 shows a document reading apparatus 21 to which the sheet feeding mechanism 20 of FIG. 1 is applied.

In FIG. 2, originals are conveyed from a paper feed mechanism 20 one by one along a conveyance path 22 as indicated by an arrow 23.
The content of the original is read by the optical unit 24 on the way, and finally discharged and stored in the stacker 25.

Reference numeral 26 denotes a motor drive circuit, and the control circuit 2
7 is operated by a control signal. The control circuit 27 receives detection signals from the original sensors 28a and 28b.

Reference numeral 29 denotes a motor, and a motor drive circuit 26
To rotate the plurality of feed rollers 30 and the like.

The pulley 31 has a built-in one-way clutch 32 for transmitting only clockwise rotation.

The paper feed mechanism 20 includes a pick section 40 and a separation section 41 as shown in FIG.

The separating section 41 is the same as the conventional one, and has a configuration in which a separator pad 43 is pressed against a separator roller 42 by a spring 44.

A one-way clutch 45 for transmitting only clockwise rotation is incorporated in the separator roller 42.

The pulley 46 of the motor 29 also incorporates a one-way clutch 47 for transmitting only counterclockwise rotation.

Next, a description will be given of the configuration of the pick section 40 which is a main part of the present invention.

A shooter 50 is fixed.

Reference numeral 51 denotes a hopper, which is pivotally supported on a shaft 52 at an end of the chute 50 near the separating portion 41, and has a first position P ₁ shown in FIG. ₁ and a second position P ₂ shown in FIG. And can rotate between them.

At the first position P ₁ , the hopper 51
It is located on the extension surface of the shooter 50 and supports the portion 8a on the sending side of the document 8.

At the second position P ₂ , the hopper 51 is bent upward with respect to the chute 50,
Only the sending-side portion 8a of the document 8 is pushed up.

Numeral 53 denotes a plate member, and a pulley 5 near the upper end.
4 is fixed to the shaft 55, and the first position Q ₁ shown in FIG.
When is pivotable between a second position Q ₂ to which is shown in FIG.

The tip side 53a of the plate member 53 is
The tip of is locked.

At the first position Q ₁ , the opening angle α between the plate member 53 and the hopper 51 is approximately 90 degrees, and the plate member 5
Reference numeral 3 functions as a stopper for receiving the end face 8b on the document sending side.

In the process of rotating from the _first position Q ₁ to the second position Q ₂ , the plate member 53 rotates the hopper 51 clockwise to the second position P ₂ . In the second position Q _2,
The opening angle β between the plate member 53 and the hopper 51 is an obtuse angle,
The plate member 53 has an angle close to horizontal and functions as a gate.

A friction member 56 is provided on the upper surface of the end 53b of the plate member 53 on the side opposite to the leading end 53a to which the original is fed.

The friction member 56 has a large coefficient of friction μ ₂ (see FIG. 10) with the original, and is, for example, a mixture of cork and urethane rubber, a synthetic resin having a textured surface, or a leather member.

A torque limiter 57 is incorporated between the pulley 54 and the shaft 55.

The second positions P ₂ and Q ₂ change according to the thickness of the document.

Reference numeral 58 denotes a pick roller, which is substantially
And is belt-mounted with the separator roller 42.

Next, the operation of the paper feed mechanism 20 having the above configuration will be described.

The paper feed mechanism 20 is initially in the state shown in FIGS. 1 and 2, and both the hopper 51 and the plate member 53 are in the first position.
At positions P ₁ and Q ₁ .

A plurality of originals 8 are stacked on a shooter 50 as shown in FIGS. The sending-out side portion 8 a of the document 8 is supported on the hopper 51. Also,
The sending-side end face 8 b of the document 8 is received by the plate member 53.

The paper feeding operation is entirely performed by the motor 29.

The motor 29 first rotates forward and rotates counterclockwise as shown by the line I in FIG.
When the originals 8a and 28b detect the original, they rotate in the reverse direction and rotate clockwise.

As the motor 29 rotates as described above, the sheet feeding operation is sequentially performed as shown in FIGS.

Operation for Preparing Documents to be Discharged from Each Other When motor 29 starts and rotates forward, rollers 42 and 58 rotate clockwise.

The pulley 46 rotates counterclockwise, the pulley 54 rotates counterclockwise via the belt, the plate member 53 rotates counterclockwise via the torque limiter 57, and the hopper 51 rotates clockwise. Is rotated.

Due to the above rotation of the hopper 51, as shown in FIG. 8, only the sending side portion 8a of the original 8 is pushed up, and the original 8 is bent. The upper original of the sending-side portion 8a further advances in the sheet feeding direction, and the sending-side portion 8a naturally forms a wedge shape as indicated by reference numeral 8a-1.

As a result, the end face 8b of the original 8 is stepped, and the original 8 is separated and the originals are separated one by one.

The hopper 51 is further rotated by the plate member 53, and the upper surface of the original 8 is pressed against the pick roller 58 rotating clockwise, and the original 8-1 on the upper surface is moved as shown in FIGS. , Sent out.

Here, in a state where the originals 8 are stacked on the chute 50, the originals 8 are pressed against the pick roller 58 by the burrs on the end faces or the perforations, even if the originals are connected to each other. At the previous stage, the originals are disconnected from each other, so that the originals 8-1 are sequentially fed out.

The pressing force F ₁ on the pick roller 58 on the upper surface of the document 8 is determined by the torque limiter 57 and always takes a predetermined value regardless of the amount of the document 8.

With this, the original 8 can be sent out stably.

Document 8 below lowermost document 8-1
Operation for Preventing Document -2 from Being Sent to Separation Unit 3 (1) Now, consider a case where document 8-2 is sent out by being dragged by document 8-1.

As shown in FIG. 10, the originals 8-1 and 8-2 are about to be sent out over the end 53b of the plate member 53 which is inclined almost horizontally.

At this time, the lower original 8-2 is
Contact with.

[0065] Here, the coefficient of friction mu ₂ against the friction member 56 of the original 8-2 is greater than the coefficient of friction mu ₁ for the original 8-2 document 8-1.

For this reason, the original 8-2 is hardly advanced further by the frictional force F ₂ , and only the upper original 8-1 is sent to the separating section 41.

When the leading end 8-1a of the original 8-1 reaches the separation section 41, the original 8-1 is conveyed by the separator roller 42 in addition to the pick roller 58 as shown in FIGS. Sent with power.

(2) The leading end 8-1a of the original 8-1 is
When the sensor reaches the positions a and 28b, the sensors 28a and 28b detect the original 8-1, and the motor 29 is rotated in reverse (see FIG. 7).

When the motor 29 rotates in the reverse direction and rotates clockwise, the one-way clutch 45 enters the non-rotation transmitting state,
The rotation of the pulleys 42 and 58 stops.

The one-way clutch 32 enters the rotation transmitting state, and the feed roller 30 is rotated clockwise. Thereafter, the original 8-1 is pulled out by the feed roller 30 and sent.

Further, the one-way clutch 47 is in a non-rotation transmitting state, and the action of gravity and the spring force stored in the document 80 causes the plate member 5 to rotate as shown in FIGS.
3 is rotated to the first position Q ₁ in the clockwise direction, the hopper 51 rotates to the first position P ₁ in the counterclockwise direction.

The inclination angle θ of the friction member 56 with respect to the horizontal is increased, the friction member 56 becomes more upright and also functions as a stopper, and the ability of the friction member 56 to prevent the original 8-2 from further moving is increased. .

As a result, the document 8-2 is reliably prevented from proceeding beyond the friction member 56.

[0074] Incidentally, in the process of the plate member 53 is rotated returned to the first position Q ₁ in the clockwise direction as described above, the original 8
The end face 8b moves by rubbing the plate member 53, and the document 8 is separated as shown in FIG.

As described above, each time one document is fed out, the document 8 is separated twice and separated sufficiently.

For this reason, the double feeding is less likely to occur in a later fed original.

[0077]

As described above, according to the first aspect of the present invention, the angle formed between the plate member and the hopper when the plate member is rotated to rotate the hopper to the second rotation position. Is bigger
So that only the sending side of the paper
The paper is pushed up and the paper is bent, and
Paper on the upper side of the minute
The output side naturally forms a wedge shape, and the end face of the paper is stepped
The paper is sorted and separated one by one.
And the paper can be separated. Also,
Since a plurality of sheets are pressed against the pick roller in a separated state, even if there is a factor of double feeding such as burring of the end face of the sheet, double feeding may be less likely to occur.

According to the invention of claim 2, the plate member is turned.
It is in hopper when rotated to a second rotational position, the plate member
And the angle between the hopper and
Only the sending side of the paper is pushed up and the paper
It is bent and used for the upper side
The paper advances further in the paper feed direction, and the feed side naturally
Form the shape, the end face of the paper is stepped, and the paper is
And the paper is separated one by one.
Separation can be promoted. Also, sent from the shooter
There is a friction member in the area where the
Therefore , even when the sheets are multi-fed, the lower sheet can be effectively prevented from being sent over the friction member by the frictional force applied by the friction member.

As a result, it is possible to effectively prevent the sheets from being multi-fed to the separation unit, and to surely prevent the sheets from being multi-fed from the separation unit.

[0080]

[0081]

[0082]

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of a sheet feeding mechanism of the present invention.

FIG. 2 is a schematic configuration diagram of a document reading apparatus to which the paper feeding mechanism of FIG. 1 is applied.

FIG. 3 is a diagram illustrating a first stage of the sheet feeding operation.

FIG. 4 is a diagram illustrating a second stage of the sheet feeding operation.

FIG. 5 is a diagram illustrating a third stage of the sheet feeding operation.

FIG. 6 is a diagram illustrating a fourth stage of the sheet feeding operation.

FIG. 7 is a diagram illustrating an operation of a motor during a sheet feeding operation.

FIG. 8 is a diagram illustrating an operation of a document when the hopper rotates.

FIG. 9 is an enlarged view showing a main part of FIG. 3;

FIG. 10 is a diagram illustrating a state when a document is sent out beyond the edge of the plate member.

11 is an enlarged view showing a main part of FIG. 4;

FIG. 12 is an enlarged view showing a main part of FIG. 5;

FIG. 13 is a diagram showing a conventional example.

[Explanation of symbols]

 8 Stacked Documents 8-1 Document at Top Position 8-2 Second Document from Top 8a Feeding Side Part 8a-1 Feeding Side Part Wedge-Shaped 8b Feeding End Face 8c Top Surface 20 Feeding Mechanism 21 Document Reading device 22 Conveyance path 24 Optical unit 25 Stacker 26 Motor drive circuit 27 Control circuit 28a, 28b Document sensor 29 Motor 30 Feed roller 31, 46, 54 Pulley 32, 45, 47 One-way clutch 40 Pick unit 41 Separation unit 42 Separator roller 43 Separator pad 44 Spring 50 Shooter 51 Hopper 52 Shaft 53 Plate member 53a Tip 53b Document feed end 56 Friction member 57 Torque limiter 59 Pick roller

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B65H 1/08 B65H 3/52 310 B65H 3/56 330

Claims (2)

(57) [Claims] 1. A feeding a plurality of sheets stacked on the chute from the top side by the pick roller, the paper feeding mechanism configured to feed separate the fed sheets one by one, about the shoe data side rotatably provided, in the first position which is on an extension of the chute, to support a side partial delivery of the paper use a plurality of sheets which are the stacked hot
And a plate member and a mechanism for rotating the plate member.
The tip side of the material locks the tip side of the hopper, and the plate member and
The hopper and the hopper are arranged so as to form a V-shape.
At the time of ejection, the plate member is rotated, and
While as the angle between the hopper is large, by rotating the said hopper to a second position Ri by said first position,
Pushes up the side component feed among the above for feeding, serial mechanism this <br/> upper surface, characterized in that a structure having a <br/> hopper rotating hand stages of pressing to the pick roller. 2. A feeding a plurality of sheets stacked on the chute from the top side by the pick roller, the paper feeding mechanism configured to feed separate the fed sheets one by one, about the shoe data side rotatably provided, in the first position which is on an extension of the chute, to support a side partial delivery of the paper use a plurality of sheets which are the stacked hot
And a plate member and a mechanism for rotating the plate member.
The tip side of the material locks the tip side of the hopper, and the plate member and
The hopper and the hopper are arranged so as to form a V-shape.
At the time of ejection, the plate member is rotated, and
While as the angle between the hopper is large, by rotating the said hopper to a second position Ri by said first position,
Pushes up the side component feed among the above for feeding, hopper rotating hand stage pressing the <br/> upper surface to the pick roller
When paper feed mechanism, characterized in that a structure and a friction member provided on the portion where the sheet fed from the chute climbs over.