JP2003276890A - Paper feeder, and recording device therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce fear of the overlapped feeding of recording paper at low cost by fixedly defining a load of a reverse roller to a paper feeding roller, in a paper feeder wherein the reverse roller is disposed releasably from the paper feeding roller. <P>SOLUTION: One end side of a rotary shaft 23 drivenly rotatably journaling the reverse roller 74 in a state that the reverse roller 74 has constant rotation resistance is freely inserted in a first oblong hole 24 long in a swing direction of the rotary shaft 23, while the other end side of the rotary shaft 23 is freely inserted in a second oblong hole 25 long in the swing direction of the rotary shaft 23. An energizing member 21 energizes the rotary shaft 23 by spring force of a torsion coil spring 22 provided in a contracted state. The first oblong hole 24 is formed with a reverse roller load restriction part 241 restricting the load of the reverse roller 74 to the paper feeding roller 71 by restricting a position of the rotary shaft 23 in an energizing direction by the energizing member 21 shown by a symbol H. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mounted on a recording device such as an ink jet recording device and automatically feeds recording paper toward a recording execution area of the recording device, and a paper feeding device. Recording device.

[0002]

2. Description of the Related Art As an example of a sheet feeding device of a recording device, a recording device is provided with a detachable sheet feeding cassette, and recording sheets stacked in the sheet feeding cassette are automatically directed one by one toward a recording execution area. What is fed is generally known. A part of this paper feeding device is mounted on the paper feeding cassette side, and the paper feeding device is configured with the paper feeding cassette attached to the recording device.

By the way, when the uppermost recording paper stacked by the rollers that are driven and rotated is fed in the paper feeding direction, several sheets of recording paper stacked under the uppermost recording paper are fed. However, there is a fear that the uppermost recording paper may be sent together with the recording paper due to frictional resistance on the surface of the recording paper or static electricity between the recording papers. In order to prevent such a so-called double feeding of recording papers in which several recording papers are fed to the paper feeding path at one time, the paper feeding device is provided with the topmost recording papers stacked. When feeding the recording papers, a separating mechanism for separating the overlapping recording papers is indispensable.

As an example of this separating mechanism, one using a reverse roller rotating in a direction opposite to the paper feeding direction is known. In order to prevent double feeding of recording paper, the separating mechanism using this reverse roller is designed to prevent the double feeding of the recording paper by the reverse roller that is driven and rotated from the lower side of the recording paper fed in the direction opposite to the paper feeding direction. The recording paper attached to the lower side of the upper recording paper is separated, sent to the paper feed cassette side, and returned to the paper feed cassette.

The reverse roller has a rotation shaft, which rotates in a direction opposite to the paper feed direction, having a rotation resistance larger than the friction resistance between the recording papers and smaller than the friction resistance between the paper supply roller and the recording papers. It is rotatably supported. As a result, when a plurality of recording papers in an overlapping state are sandwiched between the paper feed roller and the reverse roller, the recording papers in contact with the reverse roller will not rotate due to the frictional resistance between the recording papers. Since the frictional resistance between and is larger, the reverse roller rotates in the direction opposite to the paper feeding direction by the rotation of the rotating shaft and is returned to the paper feeding tray. Then, when there is only one sheet of recording paper sandwiched between the paper feed roller and the reverse roller, this time the frictional resistance between the reverse roller and the rotary shaft causes a gap between the paper feed roller and the recording paper. Since the frictional resistance is larger, the recording paper is fed in the paper feeding direction by the rotation of the paper feeding roller, and the reverse roller is driven by the recording paper to be fed and rotated in the paper feeding direction.

However, in such a separation mechanism using a reverse roller, the reverse roller is rotatably supported by a rotary shaft that rotates in a direction opposite to the paper feeding direction so as to be driven and rotatable with a certain rotation resistance. The so-called back tension will act on the recording paper. And
As a result, the accuracy of carrying the recording paper carried by the recording paper carrying means is reduced. Therefore, in such a separating mechanism, the reverse roller is arranged so that the reverse roller can be released, that is, separated from the paper feed roller, and after the recording paper is fed, the reverse roller is released from the paper feed roller to perform recording. Prevents back tension from acting on the paper.

However, since the reverse roller is releasably arranged, when the force acting in the rotation direction of the gear that transmits the rotation to the rotation shaft acts on the rotation shaft, the rotation shaft is moved in that direction. As a result, the load of the reverse roller with respect to the paper feed roller fluctuates. In other words, by arranging the reverse roller so that it can be released, the problem of back tension acting on the recording paper is solved, but this causes the load of the reverse roller on the paper feed roller to fluctuate, and the separation of the recording paper There will be a new problem of reduced performance.

As a conventional technique for solving such a problem, a sheet feeding device disclosed in Japanese Patent Laid-Open No. 7-315604 is known. The paper feeding device disclosed in this publication is a driven gear (gear) attached to a rotating shaft of a retard roller (reverse roller) movably arranged in a state of being biased by a feed roller (paper feeding roller). )When,
One or more idler gears (intermediate gears) between the drive gear (gear) mounted on the rotary shaft of the rotary drive force source
Is provided to transmit the driving force of the rotational driving force source to the rotating shaft of the retard roller. Thus, by disposing one or more idler gears between the drive gear and the driven gear, the force in the rotational direction of the drive gear acting on the rotation shaft of the retard roller can be reduced, and the retard roller It is possible to prevent the pressing force from becoming too large due to the force in the rotational direction being added to the force for pressing the roller toward the feed roller.

[0009]

However, although the conventional sheet feeding device disclosed in the above publication can reduce the force in the rotational direction of the rotary driving force source acting on the rotary shaft of the reverse roller, Since the force still acts on the rotating shaft of the reverse roller, the load of the reverse roller on the paper feeding roller fluctuates. This reverse roller separation mechanism requires that the load of the reverse roller with respect to the paper feed roller be specified with high accuracy, and even a slight change in this load causes multiple feeding of recording paper, that is, a state in which multiple recording papers are overlapped. The phenomenon that the paper is fed easily occurs. Therefore, although there is a small amount, there is a possibility that the separation performance of the recording papers may still decrease, and there is a risk that double feeding of the recording papers may occur. Also, since it is necessary to arrange one or more intermediate gears,
There is a problem that the cost of the sheet feeding device is increased.

The present invention has been made in view of such a situation, and its object is to provide a reverse roller for the paper feed roller in the paper feed device in which the reverse roller is arranged so as to be released from the paper feed roller. It is to realize at a low cost that the load of (4) is regulated to be constant and the risk of double feeding of recording paper is greatly reduced.

[0011]

In order to achieve the above-mentioned object, the invention according to claim 1 of the present application has a paper feed cassette capable of stacking recording papers, and a paper feed cassette downstream of the paper feed cassette. A sheet feeding roller which is provided and is rotatable in the sheet feeding direction;
The rotary shaft that is driven and rotated in the direction opposite to the paper feeding direction is driven with a rotation resistance that is greater than the frictional resistance between the recording papers and less than the frictional resistance between the paper feeding roller and the recording papers. A rotatably supported reverse roller, and a reverse roller release means configured to support the reverse roller in a state of being urged to the paper feed roller and to be released to a position separated from the paper feed roller. A sheet feeding device provided with the rotary shaft, wherein both ends of the rotation shaft are movably supported in the long hole direction while being loosely inserted in the long holes formed on both side surfaces of the paper feeding cassette. The load of the reverse roller with respect to the paper feed roller in a state in which the reverse roller is biased to the paper feed roller is defined by the rotational force of the rotation transmission means that transmits the rotation to the rotation shaft. A reverse roller load restricting portion that restricts the moving position of the rotary shaft in the biasing direction of the reverse roller by the reverse roller release means so that the rotary shaft does not move to a position exceeding the load. It is provided in the long hole where the side is loosely inserted,
This is a paper feeding device characterized by the above.

As described above, the load of the reverse roller with respect to the paper feed roller is regulated on the rotary shaft by the reverse roller load regulating portion formed in the elongated hole movably supporting one end side of the rotary shaft. The reverse roller release means regulates the movement position of the reverse roller in the urging direction so that it does not move to a position exceeding the load. The load of the reverse roller on the roller is
It is possible to prevent the load prescribed by the biasing force of the reverse roller release means from being exceeded.

Thus, according to the sheet feeding device of the present invention, the load of the reverse roller with respect to the sheet feeding roller is reduced by the rotational force of the rotation transmitting means for transmitting the rotation to the rotating shaft. Since it is possible to prevent the load defined by the urging force of the release means from being exceeded, the load of the reverse roller with respect to the paper feed roller can be defined to be constant. Therefore, it is possible to reduce the deterioration of the separation performance of the recording paper due to the fluctuation of the load of the reverse roller with respect to the paper feeding roller.
The effect that the risk of double feeding of recording paper can be significantly reduced is obtained.

Further, since the reverse roller load restricting portion formed in the elongated hole movably supporting one end side of the rotary shaft, the load of the reverse roller with respect to the paper feed roller can be regulated to be constant. Unlike the conventional case, it is not necessary to provide an intermediate roller or the like, and it is possible to obtain a working effect that the risk of double feeding of recording paper can be significantly reduced at low cost.

According to a second aspect of the present invention, in the first aspect, the reverse roller release means is provided on a side surface of the paper feed cassette in which a long hole is formed in which one end side of the rotary shaft is loosely inserted. A sun gear that is rotatably supported and is driven to rotate in the paper feeding direction, and a planetary gear that is rotatably transmitted to one end of the rotation shaft and that is rotatably engaged with the sun gear. The planetary gear rotates in a direction opposite to the paper feeding direction by rotating the sun gear in the paper feeding direction, and a force in a direction for pressing the reverse roller against the paper feeding roller is applied to the planetary gear. The paper feeding device is characterized by comprising a planetary mechanism that acts on.

As described above, the planetary mechanism including the sun gear and the planetary gear attached to one end of the rotary shaft can move the rotary shaft while rotating the rotary shaft in the direction opposite to the paper feeding direction. As a result, the reverse roller pivotally supported by the rotary shaft can be released. Further, the force in the direction of pressing the reverse roller against the sheet feeding roller acts on the planetary gears by the force in the direction of rotation of the sun gear, so that the rotating shaft is pushed in the direction in which the reverse roller is pressed against the sheet feeding roller. Then, the reverse roller load restricting portion provided in the elongated hole in which one end side of the rotating shaft is loosely inserted restricts the moving position of the rotating shaft that is pressed in the direction in which the reverse roller is pressed against the sheet feeding roller.

Therefore, it is possible to prevent the load of the reverse roller from the paper feed roller from exceeding the specified load, and it is possible to prevent the load from becoming smaller than the specified load. That is, by arranging the sun gear on the rotary shaft so that the force in the direction in which the reverse roller is pressed against the paper feed roller acts, the load of the reverse roller on the paper feed roller becomes smaller than the specified load. Therefore, the load of the reverse roller with respect to the paper feed roller can be regulated to be constant.

Thus, according to the sheet feeding device of the invention as claimed in claim 2, the sheet feeding device provided with the reverse roller release means by the general planetary mechanism including the sun gear and the planetary gears is claimed. The effects of the invention described in Item 1 can be obtained.

According to a third aspect of the present invention, in the second aspect, in the reverse roller release means, a cam arranged on the rotation shaft of the sun gear pivotally supports the reverse roller. The reverse roller holder is pushed to swing the reverse roller away from the paper feeding roller, thereby releasing the reverse roller. It is a device.

As described above, the cam disposed on the rotary shaft of the sun gear pushes the reverse roller holder that pivotally supports the reverse roller, and separates the reverse roller from the paper feed roller. Since the sun gear is rotated, the rotation shaft can be rotated via the planetary gears and the reverse roller can be released.

Thus, according to the sheet feeding device of the invention described in claim 3 of the present application, in addition to the effect of the invention described in claim 2 of the present application, by rotating the sun gear, the sun gear is rotated through the planetary gear. Since the rotary shaft can be rotated and the release operation of the reverse roller can be performed, the effect that the reverse roller release means can be configured at a low cost with a small number of parts is obtained.

The invention according to claim 4 of the present application includes claims 1 to
In any one of 3 above, the oblong hole in which the other end side of the rotating shaft is loosely inserted is provided with a long hole of the rotating shaft at the moving position of the rotating shaft in a state where the reverse roller is in contact with the paper feeding roller. It has a shape that does not regulate the position of the other end,
This is a paper feeding device characterized by the above.

That is, since the other end side of the rotating shaft is in a free state at the moving position of the rotating shaft in the state where the reverse roller is in contact with the sheet feeding roller, the rotating shaft is at one end side of the rotating shaft. Since the reverse roller and the reverse roller are supported at two positions in contact with the paper feed roller, the accuracy of the load of the reverse roller on the paper feed roller depends on the length of the long hole supporting one end side of the rotating shaft. It depends on the accuracy of the reverse roller load regulation unit. In this way, by restricting the load by the reverse roller load restricting portion at one location, the reverse roller load restricting portions are provided at both ends of the rotating shaft without making the other end side of the rotating shaft in a free state, and A desired accuracy can be easily obtained as compared with the case where the load is regulated by the two reverse roller load regulating section rotary shafts.

As a result, according to the sheet feeding device of the invention described in claim 4, any one of claims 1 to 3 of the application.
In addition to the function and effect of the invention described in the item (1), the accuracy of the reverse roller load restricting portion can be easily increased,
It is possible to obtain an effect that the load of the reverse roller can be easily regulated with high accuracy.

The invention described in claim 5 of the present application includes
4 is a sheet feeding device, wherein the reverse roller is pivotally supported at a position offset to the one end side of the rotation shaft.

According to the sheet feeding device of the invention of claim 5, in addition to the effect of the invention of any one of claims 1 to 4, the reverse roller has one end of the rotary shaft. Since it is pivotally supported at a position biased to the side, the position of the rotary shaft in the portion closer to the reverse roller is regulated, and thereby the load of the reverse roller can be regulated more accurately. The effect is obtained.

The invention described in claim 6 of the present application is the invention defined in claims 1 to 3.
In any one of 5 above, the reverse roller is disposed immediately downstream of the paper feeding cassette in the paper feeding direction, and the reverse roller of the paper feeding cassette is disposed at a position biased by the paper feeding roller. The paper feeding device is characterized in that the outer peripheral surface of the reverse roller closes a space between the outlet of the recording paper and the outer peripheral surface of the paper feeding roller.

The recording sheets stacked in the paper feeding cassette are pressed against a driving rotary member such as a pickup roller by a hopper or the like during the paper feeding operation, and are conveyed in the paper feeding direction by the rotation of the driving rotary member. . The recording paper conveyed in the paper feed direction is sandwiched between the paper feed roller and the reverse roller urged by the paper feed roller, and a plurality of overlapping recording papers are separated, Only the upper recording paper is fed to the paper feed path by the paper feed roller.

The recording paper sandwiched between the paper feed roller and the reverse roller in a state of being overlapped with each other has a frictional resistance between the paper feed roller and the recording paper and a frictional resistance between the recording paper and the recording paper. , And the reverse rotation resistance of the reverse roller, first, between the recording papers with the smallest frictional resistance,
Recording sheets lower than the uppermost recording sheet are conveyed in the drive rotation direction of the reverse roller (rotational direction opposite to the sheet feeding direction), and only the uppermost recording sheet is conveyed in the sheet feeding direction. As a result, among the recording papers sandwiched between the paper feed roller and the reverse roller in the state of being overlapped, the uppermost recording papers are fed in the paper feeding direction, and the lower recording papers are fed. They are conveyed and separated in the opposite directions.

Then, when the recording paper sandwiched between the paper feed roller and the reverse roller is only the uppermost recording paper, friction between the paper feeding roller and the recording paper (uppermost recording paper) is generated. Since the driven rotation resistance of the reverse roller is smaller than the resistance, the reverse roller is driven by the driving rotation of the paper feed roller to convey the uppermost recording paper and rotates in the paper feed direction. As described above, since the reverse roller is rotatably supported by the rotary shaft that is driven and rotated in the direction opposite to the paper feeding direction and has a certain frictional resistance, the paper is fed by the drive rotation of the paper feeding roller. There is no fear that a large load acts on the recording paper.

Then, when the reverse roller is separated from the paper feed roller in the state where the uppermost recording paper is sandwiched between the paper feed roller and the paper feed auxiliary roller, the reverse roller causes the reverse roller to move. After that, the recording paper is rotated in the rotation direction opposite to the paper feeding direction, and the separated recording paper is returned to the paper feeding cassette in the opposite direction to the paper feeding direction.

As described above, since the reverse roller for separating the overlapping recording papers in the state of being biased by the paper feed roller is disposed immediately downstream of the paper feed cassette in the paper feed direction, the reverse roller is used. It is less likely that the start edge of the recording paper separated by the recording paper exit of the paper feed cassette and the reverse roller will stop between the recording paper exit of the paper feed cassette and the reverse roller. can do.

Further, at the position where the reverse roller is biased by the paper feed roller, the outer peripheral surface of the reverse roller closes the gap between the outlet of the recording paper of the paper feed cassette and the outer peripheral surface of the paper feed roller. As described above, the leading edge of the recording paper that has jumped out of the outlet of the paper feed cassette hangs down in the gap between the paper feed cassette and the reverse roller, and remains in the state of protruding from the outlet of the paper feed cassette. It is possible to prevent that.

Thus, according to the sheet feeding device of the invention described in claim 6 of the present application, any one of claims 1 to 5 of the present application
In addition to the function and effect of the invention described in the item (1), the starting end of the recording paper in a state of being projected between the exit of the recording paper of the paper feed cassette and the reverse roller is It is possible to reduce the possibility that it will stop in the middle, and to prevent it from hanging from the exit of the paper feed cassette by hanging in the gap between the paper feed cassette and the reverse roller. Therefore, it is possible to reduce the possibility that the recording paper that is dragged by the recording paper that is being fed and that has jumped to the exit of the paper feed cassette cannot be completely returned into the paper feed cassette by the reverse roller. As a result, there is an effect that the risk of double feeding of recording paper and paper jam can be further reduced.

According to a seventh aspect of the present invention, in the sixth aspect, the reverse roller disposed on the downstream side of the sheet feeding cassette in the sheet feeding direction is provided by the reverse roller release means. A driven roller that is rotatable when driven to rotate by the drive rotation of the paper feed roller when the recording paper is being conveyed in the paper feed direction when it is moved to a position away from The paper feeding device is characterized in that it is provided with a paper returning means configured to move to a position where the vicinity of the start end of the recording paper protruding to the exit of the recording paper is pressed.

As described above, by the driven roller which can be rotated by the conveyance of the recording sheet conveyed in the sheet feeding direction by the driving rotation of the sheet feeding roller, the vicinity of the starting end of the recording sheet protruding to the outlet of the sheet feeding cassette. Since it is pressed against the reverse roller, the rotational force of the reverse roller, which rotates in the direction opposite to the paper feeding direction, can be reliably transmitted to the vicinity of the start end of the recording paper protruding to the exit of the paper feeding cassette. Thereby, the operation of returning the recording paper protruding from the exit of the paper feed cassette into the paper feed cassette can be performed more reliably.

As a result, according to the sheet feeding device of the invention described in claim 7 of the present application, in addition to the effect of the invention of claim 6 of the present application, the recording paper protruding to the outlet of the paper feed cassette is reversed. Since the operation of returning to the inside of the paper feed cassette by the roller can be performed more reliably, the recording paper that is dragged by the recording paper being fed and jumped out to the exit of the paper feed cassette is fed by the reverse roller. It is possible to obtain the function and effect that it is possible to reduce the possibility that the ink cannot be completely returned.

The invention described in claim 8 of the present application includes claims 1 to
A recording apparatus including the sheet feeding device according to any one of 7 above. According to the recording apparatus of the invention described in claim 8 of the present application, it is possible to obtain the effects of the invention of any one of claims 1 to 7 of the application in the recording apparatus.

[0039]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. First, a schematic configuration of an inkjet recording apparatus as a “recording apparatus” according to the present invention will be described. FIG. 1 shows a "recording device" according to the present invention.
FIG. 2 is a perspective view showing an embodiment of the ink jet recording apparatus as described above, and FIG. 2 is a side view of a main part thereof.

In the ink jet type recording apparatus 50, a carriage guide shaft 61 is provided as a recording execution means for executing recording by ejecting ink onto the recording surface of the recording paper P while reciprocating in the main scanning direction X. Axial supported, main scanning direction X
A carriage 62 that moves to the right is provided. The carriage 62 has a recording head 6 for ejecting ink onto the recording paper P.
3 is installed. A platen 53 that faces the recording head 63 and defines the distance between the head surface of the recording head 63 and the recording paper P is provided. And the carriage 62
The operation of ejecting ink from the head surface of the recording head 63 onto the recording paper P while reciprocating in the main scanning direction X and the operation of conveying the recording paper P in the sub-scanning direction Y by a predetermined amount are alternately repeated. As a result, recording is performed on the recording paper P.

Further, the ink jet type recording apparatus 50 is
A sheet feeding cassette 70 capable of stacking a large number of recording sheets P is configured to be mountable, and with the sheet feeding cassette 70 mounted, a gate roller 73 arranged in the sheet feeding cassette 70 and a reverse roller The roller 74, the hopper 75, the biasing means 77 of the hopper, the high friction member 76, and the paper feed roller 71 and the pickup roller 72 arranged in the ink jet recording apparatus 50, the “paper feed device” according to the present invention. Is composed.

Further, in the ink jet type recording apparatus 50, a conveyance driving roller 51 and a conveyance driven roller 52 are provided as "recording sheet conveying means" for intermittently conveying the fed recording sheet P in the sub-scanning direction Y. It is arranged. The conveyance driving roller 51 is rotationally controlled by the rotation driving force source, and the recording driving paper 51 is conveyed in the sub-scanning direction Y by the rotation of the conveyance driving roller 51. A plurality of transport driven rollers 52 are provided,
When the recording paper P is biased by the transport driving rollers 51 individually and is transported by the rotation of the transport driving rollers 51,
The recording paper P is brought into contact with the recording paper P and is rotated following the conveyance of the recording paper P.

A paper detector 56 is arranged on the upstream side of the conveyance driving roller 51 in the sub-scanning direction Y. Paper detector 56
Has a habit of self-returning to the standing posture and has a lever portion 56a pivotally supported in a state of protruding into the conveyance path of the recording paper P so as to be rotatable only in the recording paper conveyance direction. When the tip of the lever portion 56a is pushed by the recording paper P, the lever portion 56a rotates, and the recording paper P is detected.

Further, in the ink jet type recording apparatus 50, as a "recording sheet discharging means" for discharging the recording sheet P after recording is executed, a sheet discharging drive roller 54 and a sheet discharging driven roller 55.
Is provided. The paper ejection drive roller 54 is rotationally controlled by a rotational drive force source, and the recording paper P after recording is ejected in the sub-scanning direction Y by the rotation of the paper ejection drive roller 54. The paper discharge driven roller 55 is a toothed roller that has a plurality of teeth around it and is sharply sharpened so that the tips of the teeth make point contact with the recording surface of the recording paper P. The paper discharge driven rollers 55 are individually provided to the paper discharge drive rollers 54 so as not to damage the recording surface after recording.
The recording paper P is biased by a biasing force weaker than the biasing force of 2, and when the recording paper P is ejected by the rotation of the paper ejection drive roller 54, the recording paper P comes into contact with the recording paper P and rotates following the ejection of the recording paper P. Then, the recording paper P after recording is discharged to the downstream side in the sub-scanning direction Y by the paper discharge drive roller 54 and the paper discharge driven roller 55.

Paper ejection drive roller 54 and paper ejection driven roller 5
On the downstream side of 5, a curved path 3 is formed as a "discharge path" for inverting the recording paper P while curving the recorded recording surface inward and discharging the recording paper P to a paper discharge tray (not shown). . The curved path 3 inverts the surface of the recording paper P after recording and discharges the recording paper P in the discharge direction E while curving the recording surface inward as illustrated. A plurality of paper discharge drive rollers 31 and a plurality of paper discharge driven rollers 32 are arranged in the curved path 3.

The paper ejection drive rollers 31a to 31d are rotationally controlled by a rotational drive force source, like the paper ejection drive roller 54 described above, and the recording paper P on the curved path is ejected by the rotation of the paper ejection drive rollers 31a to 31d. It is discharged in the direction E. Also,
The paper discharge driven rollers 32 a to 32 d are the paper discharge driven rollers 55.
Similarly, the toothed roller has a plurality of teeth around it, and the tips of the teeth are sharply pointed so as to make point contact with the recording surface of the recording paper P. The recording paper P is discharged in the discharge direction E by the rotation of the discharge driving rollers 31a to 31d, respectively, by being biased to the discharge driving rollers 31a to 31d individually by a biasing force weaker than the biasing force of the transport driven roller 52 described above. When the recording paper P is ejected, the recording paper P comes into contact with the recording paper P and rotates following the ejection of the recording paper P.

Next, the structure of the "paper feeder" according to the present invention will be described. FIG. 3 shows a schematic configuration of a “paper feeding device” according to the present invention, and FIG.
FIG. 3 is a cross-sectional view of a main part showing a schematic configuration of a “paper feeder”, and FIG. 3B is an enlarged view of a part thereof.
It should be noted that the figure shows a state viewed from a side surface opposite to the side view shown in FIG.

The paper feed cassette 70 is constructed so that it can be attached to and detached from the ink jet type recording apparatus 50, and the paper feed cassette 70 mounted in the ink jet type recording apparatus 50 is provided in the ink jet type recording apparatus 50. The roller 71 and the like, and the components mounted on the paper feed cassette 70, constitute a “paper feed device” of the inkjet recording apparatus 50. In the paper feeding cassette 70, a hopper 75 is arranged on a tray portion 70a on which the recording papers P can be stacked. The hopper 75 is arranged so as to be swingable in the vertical direction (the direction indicated by the reference symbol G) with the shaft 75a as the swing shaft. At the time of paper feeding, the hopper 75 and the tray portion 70a
The recording paper P is swung upward by the urging force of the coil spring 77 that is contracted between the recording paper P and the recording paper P, and is pushed up from below to the pickup roller 72. Pickup roller 7
The rotation driving force of a sheet feeding motor (not shown) is transmitted to the driving roller 2 for driving and rotating in the rotation direction indicated by reference numeral A.
The recording paper P pressed by 5 is fed to the paper feed cassette 70.
The paper is sent in the paper feed direction from the exit.

A paper feed roller 71 is arranged in the ink jet recording apparatus 50. With the sheet feeding roller 71 and the sheet feeding auxiliary roller 73 arranged in the sheet feeding cassette 70,
The recording paper P sent from the tray section 70a is nipped by the pickup roller 72, and the recording paper P is directed toward the above-mentioned "recording paper conveying means" by the rotation of the paper feed roller 71 in the rotation direction indicated by the reference numeral B. Send out. The paper feed assisting roller 73 is rotatably supported by the paper feed, and is disposed in a state of being urged by the paper feed roller 71, and feeds the recording paper P sent out to the “recording paper conveying means”. While being pressed against the roller 71, the recording paper P is rotated by being driven. Further, the paper feed auxiliary roller 73 reduces the back tension acting on the recording paper P when the recording paper P is conveyed in the recording execution area by the “recording paper conveying means”.
It is arranged so that it can be released from 1.

The paper feed cassette 70 includes a reverse roller 7
4 are provided. The reverse roller 74 is a rotary shaft (not shown, shown and described later) that is driven by the rotational driving force of the paper feeding motor to rotate in a direction opposite to the paper feeding direction (rotational direction indicated by reference numeral C). Further, it is rotatably supported by the shaft while having a constant rotation resistance. The reverse roller 74 is urged to the paper feed roller 71 by a constant urging force, and the reverse roller 74 and the peripheral surface of the paper feed roller 71 are urged.
Only the uppermost recording sheet P1 is separated from the overlapping recording sheets P at the contact surface with the peripheral surface. Further, it is releasably arranged by "reverse roller release means" for moving the reverse roller 74 to a position separated from the paper feed roller 71.

The rotational resistance between the rotary shaft which is driven and rotated in the direction opposite to the paper feeding direction (the rotational direction indicated by the reference numeral C) and the reverse roller 74 which is rotatably supported by the rotary shaft is: The separation performance of the recording paper P by the reverse roller 74 is greatly affected. This rotation resistance is set to be smaller than the frictional resistance between the peripheral surface of the paper feed roller 71 and the contact surface of the recording paper P and larger than the frictional resistance between the overlapping recording papers P and P. ing. Therefore, in a state where two or more recording sheets P are overlapped and sandwiched between the peripheral surface of the sheet feeding roller 71 and the peripheral surface of the reverse roller 74, the recording sheet contacting the peripheral surface of the sheet feeding roller 71. P is a paper feed roller 71
Is sent in the paper feeding direction by the rotation of.

On the other hand, with respect to the recording paper P in contact with the peripheral surface of the reverse roller 74, the rotational resistance of the reverse roller 74 is larger than the frictional resistance between the overlapping recording papers P. The tray unit 70 rotates in the rotation direction opposite to the shown paper feeding direction, and thereby the tray unit 70
It is returned in a. Then, the recording paper P nipped between the peripheral surface of the paper feed roller 71 and the peripheral surface of the reverse roller 74 is 1
When the number of sheets is only one, the rotational resistance of the reverse roller 74 is smaller than the frictional resistance between the peripheral surface of the paper feed roller 71 and the contact surface of the recording paper P. Therefore, the recording paper P is delivered in the paper feeding direction. At the same time, the reverse roller 74 is driven to rotate in the rotation direction indicated by the reference symbol D.

In this way, the reverse roller 74 is rotatably supported by the rotary shaft which is driven and rotated in the direction opposite to the paper feeding direction so as to be driven and rotatable with a certain rotation resistance, so that the plurality of rollers are superposed. Since the recording papers P can be separated, it is possible to reduce the risk of double feeding in which a plurality of recording papers P are stacked.

Since the reverse roller 74 is arranged in the immediate vicinity of the exit portion of the paper feed cassette 70 as shown in the figure, the reverse roller 74 is provided at the beginning of the recording paper P jumping out of the exit portion of the paper feed cassette 70. Depending on the tray section 70
It is possible to reduce the risk that the starting end of the sheet will stop at the exit portion of the sheet feeding cassette 70 when the sheet is returned to a. Further, in addition to the reverse roller 74 being disposed in the vicinity of the exit portion of the paper feeding cassette 70 as shown in the drawing,
It is arranged at a position that closes the space between the outlet of the paper feed cassette 70 and the peripheral surface of the paper feed roller 71. As a result, it is possible to reduce the possibility that a plurality of recording papers P will enter the space between the outlet of the paper feed cassette 70 and the peripheral surface of the paper feed roller 71.

Further, in the paper feeding cassette 70, the driven roller 1 as "paper returning means" is disposed in the vicinity of the paper feeding roller 71 so as to be rotatably supported by the driven roller 1. The driven roller 1 will be described in detail later. Further, in the paper feed cassette 70, an inclined surface 78 that is inclined toward the tray portion 70a is formed on the tray portion 70a at the exit portion of the recording paper P as illustrated. Due to the inclination of the slope 78, the recording paper P in which the start end is protruding from the exit
Easily fall into the tray portion 70a.

FIG. 4 is an enlarged side view of the main part of the "paper feeder" according to the present invention. Paper feed roller 71
A gear 11 is arranged to be capable of transmitting rotation on a rotary shaft 14 that supports the. The rotation of the paper feeding motor is controlled by the gear 11
Is transmitted to the rotation shaft 14 via the paper feed roller 71, and the paper feed roller 71 rotates in the rotation direction indicated by the reference sign B. The rotation of the paper feeding motor is also transmitted to the sun gear 12 that is axially supported by the paper feeding cassette 70 while being engaged with the gear 11 so as to be rotatable. The rotation of the gear 11 causes the sun gear 12 to rotate in the direction indicated by the symbol E.

When the sun gear 12 is engaged with the sun gear 12 so as to be rotatable, the planetary gear 13 axially supported so as to be swingable in the direction indicated by the reference numeral F is rotated by the sun gear 12. , And rotates in the direction indicated by the symbol C. The planetary gear 13 is axially supported by an oscillating body 12a that is oscillatably arranged with the rotation shaft of the sun gear 12 as an oscillating shaft, and the planetary gear 13 constitutes a planetary mechanism together with the sun gear 12. In addition, the planetary gear 13 has a rotating shaft 23 that supports the reverse roller 74.
It is attached so that rotation can be transmitted. Therefore, the rotating shaft 23 rotates in the direction indicated by the reference symbol C, that is, in the direction opposite to the direction of the sheet feeding by the sheet feeding roller 71, while swinging in the direction indicated by the reference symbol F by the rotation of the feeding motor. You can

FIG. 5 is a cross-sectional view of the main part of the front view of the construction of the "paper feeder" according to the present invention. Driven roller 1
Are provided on both sides of the paper feed roller 71,
The two driven rollers 1 are movably arranged by swinging the driven roller holder 41 while being supported by one driven roller holder 41. The reverse roller 74 is connected to the rotary shaft 2 via the reverse roller holder 74a.
It is rotatably supported on the rotary shaft 23 by the rotative movement of the rotary shaft 23. One end side of the rotating shaft 23 is formed on a side surface of the tray portion 70a, and is long in the swinging direction of the rotating shaft indicated by the symbol F.
Second elongated hole 25 formed in the side surface of the tray portion 70a and elongated in the swinging direction of the rotating shaft, which is also indicated by the symbol F. Is inserted into.

Further, in the paper feeding cassette 70, as a biasing means for biasing the reverse roller 74 to the paper feeding roller 71 with a predetermined load, the rotary shaft 23 is slidably in contact with the rotary shaft 23.
The biasing members 21 for biasing in the direction indicated by the symbol H are arranged on both sides of the reverse roller 74, respectively. The urging member 21 is configured to urge the rotating shaft 23 by the spring force of the contracted torsion coil spring 22. Then, the rotation shaft 23 is rotated by the rotation of the paper feeding motor transmitted to the sun gear 12 being transmitted to the planetary gear 13 attached to one end side loosely inserted in the first elongated hole 24. Therefore, a force in the direction of rotation (see FIG. 4) of the sun gear 12, that is, a force in the direction of pressing the reverse roller 74 against the paper feed roller 71, acts on the rotary shaft 23.

Therefore, in addition to the urging force of the two urging members 21, the rotating shaft 23 has the same force as the direction in which the reverse roller 74 is pressed against the sheet feeding roller 71, that is, the urging direction H of the urging member 21. A directional force will act on that one end. Therefore, the load between the sheet feeding roller 71 and the reverse roller 74, which is defined by the urging force of the two urging members 21, is the force in the rotational direction indicated by the symbol E of the sun gear 12, and the reverse roller 74 By being pressed against the paper feed roller 71, the load becomes larger than the specified load. And thereby
The separation performance at the time of separating the recording paper P will decrease. Therefore, a reverse roller that restricts the load of the reverse roller 74 with respect to the paper feed roller 71 by restricting the position of the rotary shaft 23 in the biasing direction by the biasing member 21 indicated by the symbol H in the first elongated hole. Load regulation unit 24
1 is formed.

Since the position on the one end side of the rotating shaft 23 is regulated by the reverse roller load regulating portion 241, the reverse roller 74 is moved to the sheet feeding roller 71 by the force in the rotational direction indicated by the symbol E of the sun gear 12. By being pressed, the load of the reverse roller 74 on the paper feed roller 71 can be prevented from becoming larger than the specified load. In addition, the force in the rotational direction indicated by the symbol E of the sun gear 12 is the force in the direction in which the reverse roller 74 is pressed against the sheet feeding roller 71, and the reverse roller load regulation unit 2
Since the position of the rotary shaft 23 in that direction is regulated by 41, it is possible to prevent the force in the direction opposite to the biasing direction H of the biasing member 21 from acting on the rotary shaft. Therefore, it is possible to prevent the load of the reverse roller 74 on the paper feed roller 71 from being reduced.

The second elongated hole 25 is formed by the reverse roller 7
The position of the rotary shaft 23 is not regulated in the swing position of the rotary shaft 23 in the state where 4 is biased to the paper feed roller 71. Therefore, the reverse roller load regulation unit 24
1, the load of the reverse roller 74 with respect to the paper feed roller 71 can be regulated only by regulating the position of the one end side of the rotary shaft 23, so that the position of the reverse roller load regulating section 241 can be regulated with high accuracy. Good, the position of the rotary shaft 23 can be regulated more easily and more accurately than the position of the rotary shaft 23 is regulated by both the first elongated hole 24 and the second elongated hole 25.

Next, the paper feeding operation of the "paper feeding device" according to the present invention will be described with reference to FIGS. FIG. 6 shows a state before the start of paper feeding of the “paper feeder” according to the present invention.

The driven roller 1 is rotatably supported by the driven roller holder 41. Driven roller holder 41
Are swingably arranged with the rotation axis of the pickup roller 72 as the swing axis. Further, the driven roller 1 is pivotally supported on one end side of the driven roller holder 41, and the other end side of the driven roller holder 41 and the ink jet recording apparatus 50.
A coil spring 42 is extended between the main body and the main body. Due to the spring force of the coil spring 42, the driven roller holder 41 is biased by the driven roller 1 in a direction in which the driven roller 1 swings toward the reverse roller 74. The swing position of the driven roller holder 41 is regulated by the cam 43 that is rotated by the rotation of the paper feeding motor.

The rotary shaft 23 is pivotally supported on one end side of a reverse roller holder 44 as "reverse roller release means" for releasing the reverse roller 74 from the paper feed roller 71. The reverse roller holder 44 has a shaft 44.
It is arranged so as to be swingable with a as a swing axis. A coil spring 45 extends between the other end of the reverse roller holder 44 and the main body of the inkjet recording apparatus 50. The spring force of the coil spring 45 exerts an urging force on the reverse roller holder 44 in a direction in which the circumferential surface of the reverse roller 74 swings to a position where the circumferential surface of the reverse roller 74 contacts the circumferential surface of the sheet feeding roller 71. Further, the reverse roller holder 44 is provided with a cam 46 that is rotated by the rotation of the paper feeding motor.
The swing position is regulated.

FIG. 7 shows the paper feeding operation of the “paper feeder” according to the present invention, and shows the state immediately after the start of the paper feeding operation.

When the paper feeding motor starts to rotate, the following operations are started substantially at the same time. First, the hopper 75 rises in the direction indicated by reference sign G1 and presses the recording sheets P stacked on the tray portion 70a against the peripheral surface of the pickup roller 72. The pickup roller 72 rotates in the rotation direction indicated by the symbol A, and the recording paper P pressed by the hopper 75 is sent toward the paper feed roller 72. The paper feed roller 71 rotates in the rotation direction indicated by the symbol B. The rotary shaft 23, which supports the reverse roller 74, rotates in the direction indicated by the symbol C. The cam 46 rotates in the direction indicated by the symbol L, the reverse roller holder 44 swings in the direction indicated by the symbol F1 by the spring force of the coil spring 45, and the peripheral surface of the reverse roller 74 is the feeding roller 71. Abut the peripheral surface. At this point, the rotary shaft 23 is rotating in the direction indicated by the reference symbol C, but the reverse roller 74 is rotating in the direction indicated by the reference symbol D following the rotation of the sheet feeding roller 71. The paper feed auxiliary roller 73 moves to a position where it abuts on the paper feed roller 71 while being urged. The cam 43 is
It rotates in the direction indicated by the symbol K. At this point,
Since the rotation position of the cam 43 is the rotation position where the regulation position of the driven roller holder 41 by the cam 43 does not change, the swing position of the driven roller holder 41 does not change.

FIG. 8 shows the paper feeding operation of the "paper feeding device" according to the present invention. After the paper feeding operation is started, a plurality of overlapping recording papers P are fed by the paper feeding roller 71 and the reverse roller 7.
4 shows a state in which it is sandwiched between 4 and 4.

When the recording paper P is delivered toward the paper feed roller 71 by the rotation of the pickup roller 72, the plurality of recording papers P are delivered in a superposed state due to factors such as frictional resistance between the recording papers P. There is a possibility. Therefore, the plurality of recording papers P are sandwiched between the paper feed roller 71 and the reverse roller 74 in an overlapping state.

FIG. 9 shows the sheet feeding operation of the "sheet feeding device" according to the present invention, in which a plurality of overlapping recording sheets P sandwiched between the sheet feeding roller 71 and the reverse roller 74. Shows the state of being separated.

At the time when the paper is nipped between the paper feed roller 71 and the reverse roller 74, the hopper 75 descends in the direction indicated by the symbol G2. As a result, the recording paper P nipped between the paper feed roller 71 and the reverse roller 74.
In addition, other recording paper P is prevented from being dragged and sent out. Then, the recording paper P1 in the overlapped state is sandwiched between the paper feed roller 71 and the reverse roller 74.
The recording paper P2 and the recording paper P2 are separated as follows.

The reverse roller 74 has a rotary shaft 23, which rotates in a direction opposite to the paper feeding direction indicated by the reference numeral C, and has a friction resistance smaller than the frictional resistance between the peripheral surface of the paper feeding roller 71 and the recording paper P. Further, it is rotatably supported by the shaft while having a rotational resistance larger than the frictional resistance between the recording sheets P. Therefore, the recording paper P1 is
It is sent in the paper feed direction. Since the rotational resistance of the reverse roller 74 is larger than the frictional resistance between the recording paper P1 and the recording paper P2, the recording paper P2 is arranged so that the reverse roller 74 rotates in the rotation direction of the rotation shaft 23 (the rotation direction indicated by the symbol C). ), So that it is fed in the direction of returning it into the tray portion 70a.

Only the recording paper P1 is fed by the paper feed roller 7
1 and the reverse roller 74, the rotation resistance of the reverse roller 74 is smaller than the frictional resistance between the peripheral surface of the paper feed roller 71 and the recording paper P. Then, the reverse roller 74 is driven in the paper feeding direction and driven by the recording paper P1 to rotate in the direction indicated by the symbol D. Further, when the recording paper P2 is again sandwiched between the paper feed roller 71 and the reverse roller 74 by the reverse roller 74 being driven to rotate in the direction indicated by the code D, the reverse roller 74 is again indicated by the code C. The recording paper P2 is rotated in the direction shown, and is sent in the direction of returning it again into the tray portion 70a. By such a separating operation, the recording paper P1 and the recording paper P2 are separated, and only the recording paper P1 in contact with the paper feed roller 71 is fed.

FIG. 10 shows the paper feeding operation of the "paper feeding device" according to the present invention, in which the separated recording paper P1 is used.
Shows the state in which the paper is fed by the rotation of the paper feed roller 71. The recording paper P1 is sandwiched between the paper feed roller 71 and the paper feed auxiliary roller 73, is pressed against the paper feed roller 71 by the paper feed auxiliary roller 73, and is rotated by the paper feed roller 71 to be a "recording paper conveying unit". The sheet is fed toward the transport driving roller 51 and the transport driven roller 52.

FIG. 11 shows the paper feeding operation of the “paper feeder” according to the present invention, and shows the state in which the reverse roller 74 is released from the paper feeding roller 71.

The reverse roller holder 44 swings in the direction indicated by the symbol F2 by the cam 46 which rotates in the direction indicated by the symbol L, and the reverse roller 74 becomes the paper feeding roller 71.
Released in a position slightly separated from. The release position is defined by the shape of the cam 46. As a result, the back tension of the reverse roller 74 causes the recording paper P1 being fed by the paper feeding roller 71.
Will not work against. The reverse roller 74 continues to rotate in the direction indicated by the symbol C as the rotary shaft 23 rotates.

Further, the driven roller holder 41 swings in the direction indicated by the reference sign M1 by the cam 43 which rotates in the direction indicated by the reference sign K. As a result, the driven roller 1 moves in the direction indicated by the symbol M1, the driven roller 1 is pressed against the recording paper P1 by the spring force of the coil spring 42, and is rotated while being driven in contact with the recording paper P1. The recording paper P2 below the paper P1 is pressed against the peripheral surface of the reverse roller 74. Therefore, when the recording paper P2 is pressed against the driven roller 1, the recording paper P2 comes into close contact with the reverse roller 74 and the rotation of the reverse roller 74 is reliably transmitted. By the rotation, it is surely returned to the inside of the tray portion 70a.

FIG. 12 shows the paper feeding operation of the "paper feeding device" according to the present invention. The recording paper P2 pressed against the reverse roller 74 by the driven roller 1 is moved to the tray by the rotation of the reverse roller 74. It shows a state of being returned to the inside of the portion 70a.

In this way, the recording paper P2 sandwiched between the paper feed roller 71 and the reverse roller 74 in the state of being overlapped with the recording paper P1 is separated from the recording paper P1, and the driven roller 1 reverses the reverse roller 74. The reverse roller 74 is rotated and is reliably returned to the inside of the tray portion 70a. Since the driven roller 1 is rotatably supported by the driven roller 1, almost no back tension is applied to the recording paper P1 that is in contact with the driven roller 1, and the recording paper P1 is below the recording paper P1. P2 can be pressed against the reverse roller 74.

FIG. 13 shows the paper feeding operation of the "paper feeding device" according to the present invention, and shows the state in which the paper feeding operation is completed.

The recording paper P1 nipped by the paper feeding roller 71 and the paper feeding auxiliary roller 73 and fed, the starting end of the recording paper P1 reaches the conveyance driving roller 51 and is nipped by the conveyance driving roller 51 and the conveyance driven roller 52. In this state, the conveyance driving roller 51 is rotated (rotation in the rotation direction indicated by reference numeral S) to convey the sub-scanning direction Y. The paper feed assisting roller 73 is designated by reference numeral J2.
Released in the direction indicated by. Further, the cam 46 rotates in the direction indicated by the symbol L and the reverse roller holder 44 swings in the direction indicated by the symbol F2, whereby the reverse roller 74 is released to the position shown in the figure. Further, the cam 43 rotates in the direction indicated by the symbol K, and the auxiliary roller holder 41 swings in the direction indicated by the symbol M2, whereby the driven roller 1 is released to the position shown in the figure. Therefore, it is possible to prevent the back tension due to the paper feed auxiliary roller 73, the reverse roller 74, and the auxiliary roller 1 from acting on the recording paper P1 being conveyed in the sub scanning direction Y by the rotation of the conveyance driving roller 51. Therefore, it is possible to prevent the conveyance accuracy of the recording paper P1 from decreasing.

The invention of the present application is not limited to the above embodiments, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the invention of the present application. Needless to say.

[0083]

According to the present invention, in the paper feeding device in which the reverse roller is arranged so that the reverse roller can be released from the paper feeding roller, the load of the reverse roller with respect to the paper feeding roller is regulated to be constant, and the double feeding of the recording paper is performed. It is possible to significantly reduce the risk of the above at a low cost.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of an ink jet recording apparatus as a “recording apparatus” according to the present invention.

FIG. 2 is a side view of essential parts showing an embodiment of an ink jet recording apparatus as a “recording apparatus” according to the present invention.

FIG. 3 shows a schematic configuration of a “paper feeding device” according to the present invention, and FIG. 3A is a cross-sectional view of essential parts showing a schematic configuration of the “paper feeding device”. (B) is an enlarged view of a part thereof.

FIG. 4 is a side view of a main part showing an enlarged configuration of a “paper feeding device” according to the present invention.

FIG. 5 is a cross-sectional view of essential parts showing the configuration of a “paper feeder” according to the present invention from the front.

FIG. 6 is a view showing a state before the start of paper feeding of the “paper feeder” according to the present invention.

FIG. 7 shows a paper feeding operation of the “paper feeder” according to the present invention, and shows a state immediately after the start of the paper feeding operation.

FIG. 8 shows a sheet feeding operation of a “sheet feeding device” according to the present invention, in which a plurality of overlapping recording sheets are sandwiched between a sheet feeding roller and a reverse roller after the sheet feeding operation is started. It shows the state of being closed.

FIG. 9 is a view showing a paper feeding operation of a “paper feeding device” according to the present invention, showing a state in which a plurality of overlapping recording papers sandwiched between a paper feeding roller and a reverse roller are separated. It is shown.

FIG. 10 shows a paper feeding operation of the “paper feeder” according to the present invention, and shows a state in which separated recording papers are fed by rotation of a paper feeding roller.

FIG. 11 shows a paper feeding operation of the “paper feeder” according to the present invention, and shows a state in which the reverse roller is released from the paper feeding roller.

FIG. 12 is a view showing a paper feeding operation of a “paper feeder” according to the present invention, showing a state in which a recording paper pressed against a reverse roller by a driven roller is returned to the inside of the tray by the rotation of the reverse roller. It is shown.

FIG. 13 shows a paper feeding operation of a “paper feeding device” according to the present invention, and shows a state in which the paper feeding operation is completed.

[Explanation of symbols]

1 Driven roller 11 sun gear 12 planetary gears 21 Biasing member 24 First slot 241 Reverse roller load regulation unit 25 Second slot 41 Driven roller holder 44 Reverse roller holder 50 inkjet recording device 51 Transport drive roller 52 Transport driven roller 53 Platen 54 Paper ejection drive roller 55 Paper ejection driven roller 56 paper detector 61 Carriage guide shaft 61S Sub carriage guide shaft 62 carriage 63 recording head 70 paper cassettes 71 paper feed roller 72 Pickup roller 73 Paper feed auxiliary roller 74 Reverse roller 75 hopper P recording paper X main scanning direction Y sub-scanning direction

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2C059 AA04 AA05 AA18 AA22 AA26                 3F343 FA02 FB04 FC01 GB01 GC01                       GD01 JD04 JD09 KB05 KB12                       LA04 LA15 LC07 LC27 LD26                       MB04 MB13 MB14 MC12 MC17                       MC23

Claims (8)

[Claims] 1. A paper feed cassette capable of stacking recording sheets, a paper feed roller disposed on the downstream side of the paper feed cassette in the paper feed direction and drivingly rotatable in the paper feed direction, and the paper feed direction. And a rotational shaft that is driven and rotated in the opposite direction to the rotational shaft having a rotational resistance greater than the frictional resistance between the recording papers and less than the frictional resistance between the paper feed roller and the recording papers. Paper feed including a supported reverse roller and a reverse roller release unit configured to support the reverse roller in a state of being biased to the paper feed roller and to be released to a position separated from the paper feed roller. An apparatus, wherein both ends of the rotary shaft are movably supported in the long hole direction in a state of being loosely inserted in the long holes formed on both side surfaces of the paper feeding cassette, and are rotated by the rotary shaft. Rotation of the rotation transmission means for transmitting The reverse roller is configured so that the rotation shaft does not move to a position where the load of the reverse roller on the paper feed roller in a state in which the reverse roller is biased by the force due to force exceeds a specified load. A reverse roller load restricting portion for restricting a moving position of the rotating shaft in a biasing direction of the reverse roller by a release means is provided in an elongated hole in which one end side of the rotating shaft is loosely inserted. And the paper feeder. 2. The reverse roller release means according to claim 1, wherein the reverse roller release means is rotatably supported on a side surface of the paper feed cassette in which a long hole is formed in which one end side of the rotary shaft is loosely inserted. A sun gear that is driven to rotate in the paper feeding direction; and a planetary gear that is rotatably transmitted to one end side of the rotation shaft and that engages with the sun gear so that the sun gear can rotate. By rotating in the paper feeding direction, the planetary gear rotates in a direction opposite to the paper feeding direction, and a planetary mechanism is provided in which a force in a direction for pressing the reverse roller against the paper feeding roller acts on the planetary gear. Paper feeding device characterized by 3. The reverse roller release means according to claim 2, wherein a cam arranged on a rotation shaft of the sun gear pushes a reverse roller holder pivotally supporting the reverse roller. Then, the reverse roller is rocked in a direction in which the reverse roller is separated from the paper feeding roller, whereby the reverse roller is released. 4. The method according to claim 1, wherein
The long hole in which the other end of the rotary shaft is loosely inserted does not regulate the position of the other end of the rotary shaft at the moving position of the rotary shaft in the state where the reverse roller is in contact with the paper feed roller. A paper feeder characterized by having a shape. 5. The method according to any one of claims 1 to 4,
The sheet feeding device, wherein the reverse roller is pivotally supported at a position offset to the one end side of the rotating shaft. 6. The method according to any one of claims 1 to 5,
The reverse roller is arranged in the immediate vicinity of the downstream side of the paper feeding direction of the paper feeding cassette, and at the position biased by the paper feeding roller, the outlet of the recording paper of the paper feeding cassette, A paper feeding device, characterized in that the outer peripheral surface of the reverse roller closes the outer peripheral surface of the paper feeding roller. 7. The method according to claim 6, wherein the reverse roller arranged downstream of the paper feed cassette in the paper feed direction is moved to a position separated from the paper feed roller by the reverse roller release means. Further, a driven roller that is rotatable by being driven by the conveyance of the recording sheet conveyed in the sheet feeding direction by the driving rotation of the sheet feeding roller is provided on the reverse roller, and the recording sheet protruding to the outlet of the sheet feeding cassette. A paper feeding device comprising a paper returning means configured to move to the position where the vicinity of the starting end of the paper is pressed. 8. A recording apparatus comprising the sheet feeding device according to claim 1.