JP2001233497A - Paper feed device and recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely carry printing paper to a printing part by reducing back tension or surely obtaining the carrying force of the printing paper with a carrying roller in a paper feed device having almost a U-shaped feeding passage as viewed from the side, for feeding the printing paper by bending it. SOLUTION: Almost the U-shaped feeding passage as viewed from the side is formed with a paper feed roller 3. A guide roller 24 is installed at the end on a guide surface 24 where a carrying load becomes the largest when the rear end of the paper P is passed through a guide member 19, and the back tension is reduced. An angle regulating member 21 regulates the proceeding angle of the paper P toward the carrying roller 5, increases the contact area with the carrying roller 5, and converts reaction force from the paper 5 into the pressure force of a carrying driven roller 6 to surely carry the paper P with the carrying roller 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeder for feeding a recording material in a printing apparatus, and a recording apparatus having the paper feeder.

[0002]

2. Description of the Related Art A printer is one of recording devices.
Some printers take out the uppermost printing paper from a paper feeding (paper) tray on which a plurality of stacked printing papers (cut sheets) are placed and feed the printing paper to a recording unit (printing unit).

In such a printer, the printing paper taken out from the uppermost position is moved on a feeding path by a rotation operation of a paper feed roller and is fed to a conveyance roller. To the printing unit. At this time, the printing paper is nipped between the transport driven roller that is driven to rotate in contact with the transport roller, and is sent in the transport direction by frictional force due to contact frictional resistance between the outer peripheral surfaces of the two rollers.

Here, when the feeding path of the printing paper does not form a straight line in a side view, for example, the feeding path is curved and inverted along the outer periphery of the paper feeding roller to form a substantially U-shape in a side view. In the case of the feeding path, the leading end and the trailing end of the printing paper, while passing through the paper feed roller, contact with the guide member located outside the outer peripheral surface of the paper feed roller due to the rigidity of the print paper. It will pass through the paper feed roller.

[0005]

However, when the leading end or the trailing end of the printing paper comes into contact with the guide member and a contact frictional resistance is generated between the guide member and the guide member in this way, the printing paper in the feeding direction is not provided. A force is created that opposes progress. When the rear end of the printing paper comes into contact with the guide member, this force is a force against the conveyance of the printing paper by the conveyance roller, that is, the back tension. When back tension occurs, it becomes a force that hinders the conveyance of the printing paper, causing the printing paper to slip at the press-contact portion between the conveyance roller and the conveyance driven roller, or a drive motor or the like for rotating the conveyance roller rotating by a predetermined pitch. Phenomena such as non-rotation occur, and printing cannot be performed at a predetermined position in the printing unit, and a normal printing result cannot be obtained. In particular, when the printing paper is thick glossy paper or the like, the rigidity of the printing paper is high, so that the back tension is increased, and the above-described problem is easily caused.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a paper feeder having a substantially U-shaped feed path in a side view for feeding a curved print sheet. An object of the present invention is to surely convey the printing paper to the printing unit by reducing the back tension or increasing the conveyance force of the printing paper by the conveyance roller.

[0007]

According to a first aspect of the present invention, there is provided a sheet feeding apparatus capable of rotating forward and reverse, and by rotating the sheet feeding apparatus forward and backward, a recording medium is formed. A transport roller that transports a recording material to a recording unit that performs recording, a transport driven roller that rotates following the rotation of the transport roller by pressing against the transport roller, and an upstream side in the transport direction of the transport roller. A feed roller that feeds the recording material to the transport roller and the transport driven roller by being able to rotate forward and reverse, and rotating forward; A substantially U-shaped feeding path in side view that performs feeding while being curved and inverted along the outer periphery, and is located away from the outer peripheral surface of the paper feeding roller, and comes into contact with the recording material in the feeding direction. Having a guide surface for guiding the recording material And a guide member for feeding the recording material in a recording apparatus, the guide surface of the guide member being in contact with the recording material, and feeding the recording material. Are provided, and at least one of the guide rollers is provided at an end of the guide surface on the upstream side in the feeding direction.

A recording material fed while being curved and inverted along the outer circumference of the paper feed roller is given a certain tension by the rotating operation of the transport roller during printing, and is brought into a state of being in close contact with the paper feed roller. . Therefore, when the end of the recording material is located sufficiently far from the paper feeding roller, the recording material is sufficiently adhered to the paper feeding roller and does not come into contact with the guide member which is located at the outer periphery of the paper feeding roller. In this state, back tension does not occur at this point due to the contact with the guide member.

However, when the end of the recording material approaches the curved reversal portion by the paper feeding roller, the recording material that has been in close contact with the paper feeding roller gradually moves from the upstream side in the feeding direction due to the rigidity of the recording material. The sheet is separated from the sheet feeding roller, and eventually comes into contact with a guide member that is positioned separately from the outer peripheral surface of the sheet feeding roller.
In this case, the surface of the recording material comes into “surface contact” with the end of the guide surface until the end of the recording material rides on the guide surface beyond the upstream end in the feeding direction of the guide surface of the guide member. Contact friction resistance, that is, back tension is generated. Then, since the rear end of the recording material riding on the guide surface comes into contact with the guide surface by point contact, the recording material advances in the feeding direction while generating a lower back tension than when riding on the guide surface.

According to the first aspect of the present invention, at least one guide roller is provided at a position where the back tension due to contact frictional resistance between the guide member and the recording medium is maximized, that is, the guide roller is provided. Provided at the upstream end of the recording material in the feeding direction, it is possible to reduce the contact frictional resistance when the rear end of the recording material passes through the guide member, and to minimize the back tension described above. Can be. Therefore, the recording material can be reliably conveyed to the printing unit by the rotating operation of the conveying roller.

According to a second aspect of the present invention, there is provided a paper feeder capable of rotating forward and reverse, and conveying a recording material to a recording section for recording on the recording material by rotating forward. By pressing against the roller and the transport roller,
A transport driven roller that is driven to rotate in accordance with the rotation of the transport roller; and a transport driven roller that is located upstream of the transport roller in the transport direction and is capable of normal rotation and reverse rotation. A sheet feeding roller that feeds the recording material to a roller; and a sheet feeding device that feeds the recording material in a recording apparatus, wherein the recording material is moved from an outer peripheral surface of the sheet feeding roller. From a distance away,
On a feed path that reaches a pressure contact between the transport roller and the transport driven roller, an angle regulating member that contacts the recording material and regulates a traveling angle of the recording material toward the transport roller is provided. A contact point of the angle regulating member, which contacts the recording material, is a tangent to the transport roller outer peripheral tangent at a pressure contact point between the transport roller and the transport driven roller, when viewing the feeding path of the recording material. Is located on the transport roller side.

According to the second aspect of the present invention, the recording material comes into contact with the recording material on the feeding path where the recording material separates from the paper feeding roller and reaches the conveying roller, and the recording material is conveyed to the conveying roller. An angle regulating member that regulates a traveling angle toward the recording medium, and a contact point of the angle regulating member that comes into contact with the recording material is a conveyance roller and a conveyance driven roller when the feed path of the recording material is viewed from the side. At the contact point with the outer peripheral tangent to the conveying roller, and is located on the conveying roller side, so that the advancing angle of the recording material toward the conveying roller is pushed down to the side where the contact area with the conveying roller increases, In other words, the vehicle travels toward the transport roller with the travel angle being restricted.
Accordingly, the contact area between the conveying roller and the recording material is increased, the contact friction resistance between the recording material and the conveying roller is increased, and the conveying force of the recording material by the conveying roller is increased. The recording material can be reliably transported to the printing section.

According to a third aspect of the present invention, in the second aspect, the contact portion of the angle regulating member that comes into contact with the recording material is driven by the conveyance of the recording material. It is characterized by comprising a rotating guide roller.

According to the third aspect of the present invention, since the contact portion between the angle regulating member and the recording material is a guide roller that is driven and rotated in accordance with the conveyance of the recording material, the contact portion and the recording material are recorded. The transport load due to the frictional contact with the material, that is, the back tension can be reduced, and the recording material can be transported more stably while regulating the angle of the recording material.

According to a fourth aspect of the present invention, in the paper feeder according to the second or third aspect, the angle regulating member is configured to:
Supporting the conveyance driven roller, having a second rotation axis parallel to a first rotation axis of the conveyance driven roller, and being installed to be rotatable about the second rotation axis; Second
The rotation shaft is provided between a first rotation shaft of the conveyance driven roller and a contact point between the angle regulating member and the recording material, which is located most upstream in the feeding direction. And

The transport of the recording material by the transport roller is performed in cooperation with the contact friction resistance between the transport roller and the transport driven roller at the pressure contact portion between the two rollers and the recording material, and the rotational force of the transport roller. It is done by working. Therefore, in order to increase the contact frictional resistance, it is preferable that the pressing force at the pressing portion be higher.

On the other hand, in the second or third aspect, the angle regulating member for regulating the advancing angle of the recording material toward the transport roller pushes down the recording material with a constant force, so to speak, the recording material in the angle regulating member and the angle regulating member. Contact point receives an upward reaction force from the recording material.

According to the fourth aspect of the present invention, it is possible to change the upward reaction force into a pressing force that the conveyance driven roller presses against the conveyance roller. That is, when the contact point receives an upward reaction force from the recording material, the reaction force becomes a turning force about the second rotation axis of the angle regulating member, and the turning force is turned downward by the transport driven roller. Is transmitted as the pressing force. In other words, the so-called "leverage principle" defines the contact point as a "point of force", the second rotation axis of the angle regulating member as a "fulcrum", and the transport driven roller as an "operating point". It can be used as a pressing force for pressing the transport driven roller against the transport roller. This makes it possible to increase the contact frictional resistance between the transport roller, the transport driven roller, and the recording material without providing any special means, thereby increasing the transport force of the recording material by the transport roller. Thus, the recording material can be reliably transported to the printing unit.

According to a fifth aspect of the present invention, there is provided a paper feeder capable of rotating forward and reverse, and conveying a recording material to a recording unit for recording on the recording material by rotating forward. By pressing against the roller and the transport roller,
A transport driven roller that is driven to rotate in accordance with the rotation of the transport roller; and a transport driven roller that is located upstream of the transport roller in the transport direction and is capable of normal rotation and reverse rotation. A paper feed roller for feeding the recording material to the roller, a paper feed driven roller that is driven to rotate in accordance with the rotation of the paper feed roller by being pressed against the paper feed roller, and the paper feed roller for feeding the recording material. A sheet feeding device for feeding the recording material in the printing apparatus, comprising: a feeding path having a substantially U-shape in a side view for feeding while being curved and inverted along the outer periphery of the paper roller. Item 5 includes the guide member according to Item 1, and the angle regulating member according to any one of Claims 2 to 4, and further includes a guide surface of the guide member further including a downstream end in a feeding direction. And the end portion and the sheet feeding driven row Between the guide rollers is always provided for moving the driven once accordance feeding of the recording material, characterized in that.

According to the fifth aspect of the present invention, since the guide member according to the first aspect and the angle regulating member according to any one of the second to fourth aspects are provided,
The same operation and effect as those of the first aspect and any one of the second to fourth aspects can be obtained. Further, the guide surface of the guide member further includes an end portion on the downstream side in the feeding direction, and
Since a guide roller that is driven and rotated in accordance with the feeding of the recording material is always provided between the end portion and the paper feed driven roller, the leading end of the recording material is guided by the guide member when the recording material is fed. , The contact frictional resistance when passing through is reduced, and a more stable series of sheet feeding operations can be performed.

According to a sixth aspect of the present invention, there is provided a recording apparatus including the sheet feeding device according to any one of the first to fifth aspects.

According to the invention described in claim 6 of the present application, the same effect as the above-described invention described in any one of claims 1 to 5 of the present invention can be obtained in a recording apparatus.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS <Outline of Ink Jet Printer> An outline of an ink jet printer as a "recording apparatus" according to the present invention will be described with reference to FIGS. A description will be given centering on the rotating roller group forming the path. FIG. 1 is a schematic side view of the ink jet printer 100, and FIG. 2 is a plan view (top view) of the ink jet printer 100. (However, in FIG. 2, some components in FIG. 1 are omitted.) Ink jet printer (hereinafter simply referred to as “printer”)
That. ) 100 has a substantially U-shaped feeding path in side view as a feeding path of printing paper (cut sheet, hereinafter simply referred to as “paper”) P as a “recording material”. On this feed path, a paper feed tray 1, a paper feed roller 3, a transport roller 5, a carriage 8, and a paper discharge roller 7 are provided.

The paper feed tray 1 holds a plurality of stacked sheets P
And is detachably attached to the printer 100 with the paper P stored. Installation is
This is performed by being inserted almost horizontally from the near side of the printer 100 (left side in FIG. 1) to the back of the printer 100 (right side in FIG. 1).

Below the paper feed tray 1, a hopper 2 and a hopper holder 18 are arranged. The hopper 2 is attached to the bottom of the paper feed tray 1 so as to be rotatable about a hopper shaft 2a. The hopper holder 18 is attached to the bottom of the hopper 2 so as to be rotatable about the hopper holder shaft 18a. It forms part of the bottom. The paper feed tray 1 is pushed upward by a convex portion 18c provided on the hopper holder 18 pushing up the hopper 2 by the urging force of a spring 18b, and the paper P stacked on the paper feed tray 1 is pushed up.
Is pressed against the paper feed roller 3, and the paper P is sent out by the rotation of the paper feed roller 3.

As shown in FIG. 2, a plurality of paper feed rollers 3 (five in this embodiment) are attached to the paper feed roller shaft 3a. Some of them (three in this embodiment)
Is configured such that a sheet of paper P is wound around the surface of the roller and is easily fed. The rubber material 3b is not attached to the surface of the other paper feed rollers 3 (two in this embodiment), and these paper feed rollers 3 are formed by the paper feed roller 3 having the rubber material 3b. To assist in feeding. These paper feed rollers 3
Is driven to rotate (forward rotation and reverse rotation) about a paper feed roller shaft 3a by a drive motor (not shown).

A plurality (three in the present embodiment) of paper feed driven rollers 4 are provided on the back surface of the paper feed roller 3 so as to be able to advance and retreat with respect to the paper feed roller 3 having the rubber material 3b. . The paper feed driven roller 4 is pressed against the paper feed roller 3 during a feeding operation for feeding the paper P to the transport roller 5, and is driven to rotate according to the rotation of the paper feed roller 3. The paper feed driven roller 4 is separated from the paper feed roller 3 during printing in which the paper P is transported by the transport roller 5 in order to eliminate the back tension of the paper P. Further, at this time, the paper feed driven roller 4
Is slightly projecting from the guide surface 26 of the guide member 19, so that the contact frictional resistance when the leading end or the trailing end of the paper P passes is reduced, thereby also reducing the back tension.

Returning to FIG. 1, an auxiliary roller 10 for assisting the feeding operation by the paper feed roller 3 is provided near the side of the paper feed roller 3. The auxiliary roller 10 is supported by an auxiliary roller holder 10a. Auxiliary roller 1
At 0, the drive motor is not connected, and is configured to rotate freely in contact with the paper P as the paper P is fed.

A separation pad 11a as sheet separation means for preventing double feeding of the sheet P and a pad holder 11 are provided at a lower rear portion of the sheet feeding roller 3. pad·
The holder 11 is configured to be able to advance and retreat with respect to the paper feed roller 3, and a separation pad 11 a installed on the pad holder 11.
Is pressed against the roller surface of the feed roller 3 and is released. Here, if the friction coefficient between the rubber material 3b and the paper P is μ1, the friction coefficient between the separation pad 11a and the paper P is μ2, and the friction coefficient between the papers P is μ3, μ1>
Since μ2> μ3, the paper feed tray 1
When the uppermost paper P stacked on the paper feed tray 1 is sent out by pressing it against the paper feed roller 3, the uppermost paper P, which is lower than the next paper P, is double-fed. Is prevented from being sent. In addition, the separation pad 11a and the pad holder 11 are separated from each other to eliminate back tension during printing in which the paper P is transported by the transport roller 5.

Guide surfaces 25 and 26 for guiding the paper P are provided along the outer peripheral surface of the paper feed roller 3 around the paper feed roller 3.
Members 1 as "guide members" each having
Reference numerals 7 and 19 are provided at a fixed distance from the outer peripheral surface of the paper feed roller 3 (the outer peripheral surface of the rubber material 3). The guide member 17 includes a plurality of guide rollers 15.
A and 15B (six in this embodiment) are the guide members 1
9 is provided with guide rollers 24 (three in this embodiment: see FIG. 2) to reduce the transport resistance of the paper P when the leading and trailing edges of the paper P pass.

As shown in FIG. 1, the transport roller 5 is located downstream of the paper feed roller 3 and the paper feed driven roller 4 in the feeding direction, and is rotationally driven by a drive motor (not shown).
The transport driven roller 6 is driven to rotate by being pressed against the transport roller 5. The transport roller 5 and the transport driven roller 6 pinch the paper P, and at a constant pitch in the sub-scanning direction (FIG. 1).
To the left).

Between the transport roller 5 and the paper feed roller 3,
A plurality of angle regulating members 21 (to be described later, 6
Pieces: see FIG. 2), but the ink jet printer 100
Is attached to a support post 20 which is a part of the frame of FIG.
A and two auxiliary regulating rollers 16B are attached. The angle regulating member 21 regulates the angle at which the paper P travels from the paper feed roller 3 to the transport roller 5.

Between the transport roller 5 and the paper feed roller 3,
A paper detector 13 is attached as "detecting means" for detecting the passage of the recording material. The paper detector 13 detects the paper P
Detect the leading and trailing ends of This detection signal is given to a control unit described later to detect the current position of the paper P,
It is used for identifying the size of the object.

The carriage 8 includes a carriage (not shown).
The motor is configured to reciprocate along the guide shaft 12 in the main scanning direction (the direction of the front and back of the paper in FIG. 1). An ink cartridge 8a is detachably mounted on the carriage 8, and the ink in the ink cartridge 8a is sent to a recording head 8b provided on the surface of the carriage 8 facing the paper P. The recording head 8b discharges ink from a nozzle row (not shown) formed on the surface facing the paper P onto the paper P conveyed onto the platen 9, thereby performing printing.

<Structure and Operation and Effect of Guide Member> Next, the structure of the guide members 17 and 19 and the guide rollers 24, 15A, 1 will be described with reference to FIGS.
The operation and effect of 5B will be described in detail. FIG. 3 and FIG.
FIG. 4 is a side view schematically illustrating a roller group contributing to the feeding of a sheet P with a focus on a sheet feeding roller when the feeding path is viewed from the side.

In FIG. 3 and FIG.
The guide surface 26 is located downstream of the guide member 19 in the feeding direction, and guides the leading edge of the sheet P when passing the leading edge.
Further, it has guide rollers 15A and 15B for reducing the contact frictional resistance when the tip passes. The guide roller 15B is provided at the most downstream side in the feeding direction with respect to the guide surfaces 25 and 26, that is, at the end of the guide surface 26. The guide roller A is a guide roller.
It is provided between the roller 15B and the paper feed driven roller 4.
The guide surface 26 is formed to have a smooth surface to reduce the contact frictional resistance with the paper P, and the guide rollers 15A, 1
5B is provided so as to slightly protrude from the guide surface 26 so as to contact the paper P. Guide rollers 15A, 15B
Reduces the contact frictional resistance when the leading edge of the paper P passes through the guide surface 26, and reduces the leading edge of the paper P by the guide roller 15B.
Until the sheet P is guided by the regulating roller 16A (see FIG. 1) in the feeding direction.

The guide member 19 is located upstream of the guide member 17 in the feeding direction, and has the above-described paper feed driven roller 4 and guide roller 24. Guide roller 2
4 are guide surfaces 25, 2 as shown in FIGS.
6, at the most upstream side in the feeding direction, that is, at the end of the guide surface 25. In addition, other guide rollers may be appropriately provided on the guide surfaces 25 and 26 in order to reduce the conveyance resistance of the paper P.

Next, the function and effect of the guide roller 24 will be described. 3 shows a state in which the sheet P1 is in a transport state and the rear end of the sheet P1 is out of the range of FIG. 3 (left side), and FIG. 4 shows a state in which the rear end of the sheet P1 reaches the guide roller 24. . In FIG. 3, the sheet P1 is conveyed in the direction of the arrow (left side) by the rotation of a conveying roller (not shown). A constant conveying force (tension) is applied to the sheet P1 by the rotation operation of the conveying roller, whereby the sheet P1 comes into close contact with the outer peripheral surface of the sheet feeding roller 3. At this time, the paper feed roller 3 is driven to rotate in synchronization with the conveyance of the paper P1 in the counterclockwise direction in the figure so that back tension is not generated due to the contact frictional resistance between the paper P1 and the paper feed roller 3.

As shown in FIG. 3, when the rear end of the paper P1 is located far enough from the paper feed roller 3 (on the left side in FIG. 3), the paper P1 is removed from the rear of the paper P1 from the paper feed roller 3. The sheet P1 is fed in the feeding direction while contacting the sheet P2 at the top of the sheet feeding tray 1. At this time, the sheet P1 has a rear end located sufficiently far from the sheet feeding roller 3; 3 and placed in contact with the auxiliary roller 10. Accordingly, the auxiliary roller 10 rotates in a counterclockwise direction in FIG.
Does not contact the guide members 17 and 19.

Next, as shown in FIG. 4, as the rear end of the paper P1 approaches the paper feed roller 3, the paper P1 forms an obtuse angle with the paper feed tray 1 near the auxiliary roller 10. Therefore, the sheet P1 is separated from the auxiliary roller 10,
In addition, it is separated from the paper feed roller 3 from the upstream side in the feeding direction and gradually approaches the guide member 19. When the sheet P1 comes into contact with the guide member 19, contact friction resistance, that is, back tension is generated between the sheet P1 and the guide member 19.
However, in this case, a guide roller 24 is provided at a point where the sheet P1 comes into contact with the guide member 19.
Accordingly, the contact friction resistance between the sheet P1 and the guide member 19, that is, the back tension is greatly reduced, and the sheet P1 can be transported by the transport rollers reliably.

<Structure and Operation and Effect of Angle Restricting Member> Next, the structure of the angle restricting member 21 will be described with reference to FIG. FIG. 5A is a plan view (top view) showing the structure of the angle regulating member 21, and FIG. 5B is a side view. The angle regulating member 21 includes a transport driven roller 6, a regulating roller 16
A and an auxiliary regulating roller 16B are provided rotatably. A rotation shaft 23 for rotation is provided in the angle regulating member 21 through a coil spring 22, and is installed so as to be rotatable around the rotation shaft 23.

The angle regulating member 21 is an ink jet
It is attached to a column 20 that forms the printer 100.
The support column 20 is provided with a guide portion (not shown) for restraining the upward movement of the rotation shaft 23 in FIG. 5B, and the rotation shaft 23 is guided by the guide portion and the side surface of the support column 20. Have been. Further, a claw 26 is provided on the support 20, and by restricting one end of the coil spring 22, the rotating shaft 23 is pressed against the side surface of the support 20 by a spring force that expands both ends of the coil spring 22. On the other hand, the other end of the coil spring 22 extends near the middle of the two transport driven rollers 6 provided in the angle regulating member 21. Therefore,
The rotating shaft 23 receives a spring force that moves upward by a spring force at which both ends of the coil spring 22 expand, but the rotating shaft 23 moves upward due to the guide portion provided on the column 20. Is constrained, and is pressed against the guide portion by the spring force. Thereby, the rotating shaft 23 is fixed to the column 20 by the spring force of the rotating shaft 23 pressed against the guide portion and the above-described spring force of the column 20, so that the angle regulating member 21 is moved. Fixed. At the same time, the transport driven roller 6 is driven by the coil spring 22.
Of both ends receive the expanding spring force, and are pressed against the conveying roller 5 by the spring force.

Next, the operation and effect of the angle regulating member 21 will be described with reference to FIGS. FIGS. 6 and 7 are side views of the feeding path in which only the rotating roller group (but partially omitted) in FIG. 1 is simply illustrated for convenience of explanation. The roller 16A and the auxiliary regulating roller 16B are connected to the angle regulating member 21.
It is attached as one unit.

First, the regulation of the advance angle of the sheet P toward the transport roller 5 will be described with reference to FIG. In FIG. 6, the conveying roller 5 and the conveying driven roller 6 are formed such that a straight line passing through the center of both rollers is perpendicular to a vertical line V at an angle α (for example, 11
°). This is to prevent the paper P sent from the transport roller 5 from floating on the platen 9 (see FIG. 1) located on the left side of the transport roller 5. Also, the tangent T (which forms an angle (90 + α) ° with the vertical line V) at the pressure contact point between the transport roller 5 and the transport driven roller 6 is:
A transport roller 5 and a transport driven roller 6 are provided so as to be in contact with the outer periphery of the paper feed roller 3. Therefore, when the angle regulating member 21 does not exist, the paper P separated from the paper feed roller 3 travels to the transport roller 5 along a feed path indicated by a tangent line T.

However, the regulating rollers 16A and 16B are installed such that the contact point with the sheet P is located on the side of the conveying roller 5 with respect to the tangent line T. Therefore, the regulating rollers 16A, 1
6B, the paper P is tangent to the tangent T at an angle β (for example, 2
(°), the traveling angle is regulated to the conveying roller 5.

Here, the regulating rollers 16A, 16B regulate the advancing angle of the sheet P in a direction of pressing the sheet P downward to the sheet feeding roller 5, whereby the sheet P is moved by a drive motor (not shown). The contact area between the rotating roller 5 and the transport roller 5 can be increased, thereby increasing the contact frictional resistance between the transport roller 5 and the paper P, thereby increasing the transport force of the transport roller 5 and ensuring more reliability. The paper P can be conveyed at the same time.

The auxiliary regulating roller 16B assists the regulation of the angle of the sheet P by the regulating roller 16A.
The angle regulation of the sheet P by the regulation roller 16A is ensured. Therefore, from this viewpoint, rollers other than the above may be provided as appropriate, and conversely, the operation and effect of the present invention can be obtained without providing the auxiliary regulating roller 16B.

Next, the regulating roller 16A will be described with reference to FIG.
The relationship between the transfer driven rollers 6 will be described. As described above, the transport driven roller 6 is moved by the spring force of the coil spring 22 provided on the angle regulating member 21.
Pressed. On the other hand, since the regulating roller 16A presses the sheet P from above, the regulating roller 16A receives an upward reaction force N1 from the sheet P at the contact point C1 with the sheet P. here,
Since the angle restricting member 21 is installed so as to be rotatable about the rotating shaft 23, the reaction force N1 is a rotating force with the rotating shaft 23 as a fulcrum shaft. Then, the rotating power is transmitted to the transport driven roller 6 as an action point by a so-called lever principle, and becomes a downward pressing force N2.

Accordingly, the transport driven roller 6 is
In addition to the downward pressing force due to the spring force of the coil spring 22, the pressing force N2 is further obtained, whereby the contact friction resistance at the contact point C2 of the transport driven roller 6, the transport roller 5, and the paper P is reduced. As a result, the transport force of the paper P due to the rotation of the transport roller 5 is increased, so that the paper P can be transported reliably.

In other words, the angle regulating member 21 provided to regulate the angle of advance of the sheet P toward the transport roller 5
However, since the conveyance driven roller 6 also has a function of increasing the pressing force pressing the conveyance roller 5, the contact area between the paper P and the conveyance roller 5 increases due to the advance angle regulation of the paper P by the angle regulating member 21, and the conveyance roller 5 is not only increased, but at the same time
Is increased, so that the transport force of the sheet P by the rotation of the transport roller 5 can be effectively and economically increased by a synergistic effect.

Although the present embodiment has been described with respect to an embodiment in which the present invention is applied to a printer, it goes without saying that the present invention can be applied to a recording apparatus such as a copying machine and a facsimile.

[0051]

As described above, according to the present invention,
In a paper feeding device having a substantially U-shaped feeding path in side view that performs feeding while bending and reversing the printing paper along the outer circumference of the paper feeding roller, the transport load accompanying the transport of the printing paper, that is, the back tension, A guide roller to be reduced is provided on the feeding path, or an angle regulating member is provided to increase the conveying force of the conveying roller, so that the printing paper can be stably and surely conveyed. Printing results can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic side view of an ink jet printer according to the present invention.

FIG. 2 is a schematic plan view (top view) of the ink jet printer.

FIG. 3 is a schematic side view of a feeding path, showing details around a sheet feeding roller of the printer.

FIG. 4 is a schematic side view of a feeding path, showing details around a sheet feeding roller of the printer.

FIG. 5A is a plan view (top view) of an angle regulating member of the printer, and FIG. 5B is a side view.

FIG. 6 is a schematic side view of a feeding path, illustrating angle regulation of a printing sheet by an angle regulating member of the printer.

FIG. 7 illustrates an angle regulating member, a conveyance driven roller,
FIG. 4 is a schematic side view of a feeding path, illustrating a relationship between regulating rollers.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 ink jet printer 3 paper feed roller 4 paper feed driven roller 5 transport roller 6 transport driven roller 15A, 15B, 24 guide roller 16A regulating roller 16B auxiliary regulating roller 17, 19 guide member 20 support 21 angle regulating member 22 coil Spring 23 Rotating shaft 25, 26 Guide surface P, P1, P2 Printing paper

Claims (6)

[Claims] A transport roller that transports the recording material to a recording unit that performs recording on the recording material by rotating forward and reversely; A transport driven roller that is driven and rotated in accordance with the rotation of the transport roller; and a transport driven roller that is located upstream of the transport roller in the transport direction and is capable of normal rotation and reverse rotation. A feed roller that feeds the recording material to the recording medium; a substantially U-shaped feeding path in a side view that feeds the recording material by bending and inverting the recording material along the outer periphery of the feed roller; A guide member having a guide surface that is located apart from the outer peripheral surface of the paper roller and that guides the recording material in a feeding direction by contacting the recording material. For paper feeder that feeds materials A guide surface of the guide member, a plurality of guide rollers that are in contact with the recording material and that are driven to rotate in accordance with the feeding of the recording material are provided; A sheet feeding device provided at an end of the guide surface on the upstream side in the feeding direction. 2. A transport roller for transporting a recording material to a recording unit for performing recording on the recording material by rotating forward and reverse, and by pressing against the transport roller, A transport driven roller that is driven and rotated in accordance with the rotation of the transport roller; and a transport driven roller that is located upstream of the transport roller in the transport direction and is capable of normal rotation and reverse rotation. A paper feed roller for feeding the recording material in a recording apparatus, wherein the recording material is separated from an outer peripheral surface of the paper feed roller. An angle regulating member that contacts the recording material on a feeding path from a position to a pressure contact point between the conveyance roller and the conveyance driven roller, and regulates a traveling angle of the recording material toward the conveyance roller. Set The contact point of the angle regulating member that comes into contact with the recording material may be, when viewing the feeding path of the recording material, viewing the conveyance roller at a pressure contact point between the conveyance roller and the conveyance driven roller. A sheet feeding device, wherein the sheet feeding device is located on the side of the transport roller with respect to an outer peripheral tangent. 3. The feeding device according to claim 2, wherein the contact portion of the angle regulating member that comes into contact with the recording material comprises a guide roller that is driven and rotated in accordance with the conveyance of the recording material. Paper equipment. 4. The angle regulating member according to claim 2, wherein the angle regulating member supports the transport driven roller, and has a second rotation axis parallel to a first rotation axis of the transport driven roller. A second rotation axis of the angle regulating member, a second rotation axis of the conveyance driven roller, and a first rotation axis of the conveyance driven roller, the angle being the most upstream in the feeding direction. A sheet feeding device provided between a regulating member and a contact point of the recording material. 5. A transport roller for transporting the recording material to a recording unit for performing recording on the recording material by rotating forward and reverse, and by pressing against the transport roller, A transport driven roller that is driven and rotated in accordance with the rotation of the transport roller; and a transport driven roller that is located upstream of the transport roller in the transport direction and is capable of normal rotation and reverse rotation. A paper feed roller that feeds the recording material to the paper feed roller; a paper feed driven roller that rotates in accordance with the rotation of the paper feed roller by being pressed against the paper feed roller; A sheet feeding device for feeding the recording material in a printing apparatus, comprising: a feeding path having a substantially U-shape in side view for feeding while being curved and inverted along the outer circumference of a roller. The guide according to 1 A material, and the angle regulating member according to any one of claims 2 to 4, wherein the guide surface of the guide member further includes an end portion on the downstream side in the feeding direction, and the end portion. Between the paper feed driven roller,
A sheet feeding device, wherein a guide roller that is driven and rotated in accordance with the feeding of a recording material is always provided. 6. A recording apparatus comprising the sheet feeding device according to claim 1. Description: