JP2004083268A - Sheet feeder and recording device incorporating the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet feeder having guide rollers provided with high precision at a low cost for regulating the advancing direction of a sheet of printing paper, and properly regulating the advancing direction of the sheet of paper even if the precision is lowered. <P>SOLUTION: In a sheet feeding route substantially U-shaped from a side view, the guide rollers 15b, 15c are provided near an ending position of a reverse curving section of the sheet of paper P, and the advancing direction of the edge of the sheet of paper P is regulated by the guide rollers 15b, 15c. The guide roller 15b can be provided easily and with precision without being affected by parts precision and assembling precision, by elastically coming into contact with a sheet feeding roller 3. The guide roller 15c is composed to approach the sheet feeding roller 3 as a second sheet guide member 17 separates from the sheet feeding roller 3, and the advancing direction of the sheet of paper P is properly maintained. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sheet feeding device for feeding a recording material in a recording device typified by a facsimile, a printer, and the like. The present invention relates to a sheet feeding device having a substantially U-shaped feed path. The present invention also relates to a recording device provided with the sheet feeding device.
[0002]
[Prior art]
In a printer as one of the recording apparatuses, the top printing paper is taken out one by one from a paper feed tray on which a plurality of stacked printing papers (cut sheets) are placed, and is taken out to a recording unit (printing unit). Some include a paper feeding device for feeding. In the paper feeding device, a hopper disposed at the bottom of the paper feeding tray lifts the printing paper upward, abuts (presses) the paper feeding roller, and then rotates the paper feeding roller to print the uppermost printing paper. The paper is taken out and fed to the recording unit.
[0003]
By the way, depending on the arrangement of the sheet feeding tray, the sheet feeding roller, and the recording unit, a feeding path in which the print sheet is inverted and curved by the sheet feeding roller, that is, a substantially U-shaped shape when the feeding path is viewed from the side. In some cases, such a feeding route is formed. In a sheet feeding device having such a feeding path, a printing sheet is guided downstream by a guide member having a concave curved surface along the outer periphery of a sheet feeding roller. Then, for example, a configuration may be adopted in which print paper is taken out from a paper feed tray disposed below, is reversed and curved by a paper feed roller, is sent to an upper recording unit, and recording is performed.
[0004]
[Problems to be solved by the invention]
By the way, since the printing paper is inverted and curved by the paper feed roller as described above, after exiting the curved section, the user tries to return to the original posture. Therefore, the traveling direction of the printing paper that has passed through the curved section is in the direction away from the paper feed roller. Therefore, it is desirable to provide a guide roller for pressing the printing paper toward the paper feed roller at the end of the curved section, and to regulate the traveling direction of the printing paper by the guide roller.
[0005]
Here, if the component accuracy or the assembly accuracy is reduced, an error occurs in the arrangement position of the guide roller, which may cause a problem that the traveling direction of the printing paper cannot be appropriately regulated. Therefore, in order to prevent such a problem, it is necessary to improve the component accuracy and the assembly accuracy, but in this case, the cost is increased.
[0006]
Therefore, the present invention has been made in view of such a situation, and a problem thereof is to dispose a guide roller that regulates the traveling direction of a printing paper with high accuracy and at low cost, and to make sure that an error occurs in the disposition position by any chance. An object of the present invention is to provide a sheet feeding device capable of appropriately regulating the traveling direction of a printing sheet even when the sheet is generated.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the paper feeding apparatus according to claim 1 of the present application winds and feeds a recording material around an outer peripheral surface, thereby feeding a recording material having a substantially U-shape in side view. A recording material guide that has a feeding roller that is driven to rotate and forms a path, and has a concave curved surface along the outer peripheral surface of the paper feeding roller, and guides the recording material downstream by the concave curved surface. A member, a plurality of guide rollers are provided along the recording material feeding direction on the concave curved surface, and guide the recording material to the downstream side by being rotated by contact with the recording material, A sheet feeding device that feeds the recording material one by one to a conveyance roller that conveys the recording material, which is located downstream of the feeding path, and exits a curved section in the feeding path. The traveling direction of the recording material is arranged at the most downstream side of the plurality of guide rollers. The first guide roller and the second guide roller disposed upstream from the first guide roller are configured to be regulated, and can be swung when the recording material feeding path is viewed from the side. The first guide roller and the second guide roller are pivoted on a swing member provided on the recording material guide member so that the second guide roller elastically contacts the paper feed roller. Supported, the swinging member can swing around the second guide roller in a state of elastic contact with the paper feed roller as a fulcrum, and as the concave curved surface separates from the paper feed roller, the One guide roller is configured to swing in a direction to press the recording material toward the paper feed roller.
[0008]
According to the first aspect of the present invention, it is possible to simplify the structure of the guide roller for regulating the traveling direction of the recording material, to attach the guide roller at low cost and with high accuracy, and to cause an error in the arrangement position. In this case, the traveling direction of the recording material can be appropriately regulated. That is, two guide rollers, a first guide roller and a second guide roller provided upstream of the first guide roller, are provided near the end position of the curved section forming the feeding path having a substantially U-shaped shape. Accordingly, the traveling direction of the recording material that has exited the curved section is regulated. Here, the first guide roller and the second guide roller are attached to one swinging member, and the swinging member is configured to elastically contact the second guide roller with the sheet feeding roller. Attached to the recording material guide member. Accordingly, since the second guide roller is positioned by resiliently contacting the second guide roller with the paper feed roller, the arrangement of the second guide roller and the first guide roller downstream of the second guide roller is performed. The first guide roller and the second guide roller can be disposed at low cost and with high accuracy without the need for high component accuracy and high assembly accuracy because the installation position is easily determined.
[0009]
Next, the swing member is attached to the recording material guide member so as to be able to swing, and the swing direction is such that the concave curved surface provided on the recording material guide member is separated from the sheet feeding roller. The direction is such that the first guide roller presses the recording material toward the paper feed roller. In other words, even if the recording material guide member is not properly attached and the concave curved surface is separated from the paper feed roller, the swing member that supports the first guide roller and the second guide roller is supported. Is that the first guide roller presses the recording material toward the paper feeding roller, whereby the traveling direction of the recording material does not point in the direction away from the paper feeding roller. Direction can be appropriately regulated.
[0010]
According to a second aspect of the present invention, in the first aspect, the transport roller is disposed in a traveling direction of the recording material in a state where the first guide roller presses the recording material toward the paper supply roller. It is characterized by being located.
According to the invention described in claim 2 of the present application, since the transport roller is positioned in the recording material advancing direction in a state where the first guide roller presses the recording material toward the paper feed roller, The recording material that has passed through the first guide roller proceeds straight to the transport roller, thereby preventing the recording material from traveling in an unintended direction and causing a paper jam. Can be fed to the transport rollers.
[0011]
The paper feeding device according to claim 3 of the present application is the paper feeding device according to claim 1 or 2, in which the recording material joins the substantially U-shaped feeding path near the end position of the curved section and directs the recording material toward the transport roller. And a second feeding path for feeding the sheet.
According to the invention described in claim 3 of the present application, the second portion that joins the substantially U-shaped feeding path near the end position of the curved section and feeds the recording material toward the transport roller. Since the paper feed path is provided, the operation and effect of the invention described in claim 1 of the present application can be obtained in a paper feeder having such a second paper feed path.
[0012]
According to a fourth aspect of the present invention, in the third aspect, in the third aspect, the substantially U-shaped feeding path is joined near the end position of the curved section to convey the roll paper wound in a roll shape. A roll paper feeding path for feeding the paper toward the rollers is further provided.
According to the invention described in claim 4 of the present application, near the end position of the curved section, it joins with the substantially U-shaped feeding path, and feeds the rolled roll paper toward the transport roller. Since the roll paper feeding path for feeding is further provided, the operation and effect of the invention described in claim 1 of the present application can be obtained in a paper feeding apparatus having such a roll paper feeding path.
[0013]
According to a fifth aspect of the present invention, in the paper feeding device according to any one of the first to fourth aspects, the swinging member presses the reversing curved portion of the recording material reversed and curved by the paper feeding roller from outside. Accordingly, the recording material has an assist function for assisting a traveling force for advancing the recording material from the reverse curved portion to the preceding feeding path.
[0014]
According to the fifth aspect of the present invention, the force (apparent rigidity of the recording material) in which the recording material travels downstream through the curved section due to the curved section in the feeding path is reduced. Even in this case, the assisting member assisting the advancing force of the recording material allows the recording material to move strongly toward the downstream side without losing to an obstacle that hinders the progress of the recording material. .
[0015]
That is, in a sheet feeding apparatus that adopts a sheet feeding method in which a recording material is inverted and curved by a sheet feeding roller to feed the recording material, the recording material is affected by an obstacle existing on the feeding path by the inversion bending portion. It is easy to receive. In other words, the recording material is likely to bend in the reversing curved portion. For example, the recording material abuts on the feeding path on the downstream side in the feeding direction from the reversing bending portion to hinder the advance of the recording material. When there is an obstacle, when the leading edge of the recording material comes into contact with the obstacle, the reversing curved portion easily bends, whereby the leading edge of the recording material does not temporarily advance from the obstacle. Stagnate.
[0016]
The occurrence of the bending not only gives the recording material a bending habit, but also hinders the smooth feeding operation of the recording material, and in particular, the obstacle comes in contact with the recording material and prevents the recording material from passing therethrough. In the case of a recording material detecting device for detecting, it is impossible to accurately detect passage of the recording material.
[0017]
However, according to the present invention, since the swinging member has an assist function of pressing the reversing curved portion of the recording material from the outside, the recording material can be strongly advanced from the reversing curved portion. And the above-mentioned problem can be solved.
[0018]
According to a sixth aspect of the present invention, in the sheet feeding apparatus according to any one of the first to fifth aspects, the recording material guide member is provided rotatably as viewed from a side of a recording material feeding path. By moving, it can be retracted from the paper feed roller.
According to the sixth aspect of the present invention, the recording material guide member is provided to be rotatable when viewing the feeding path of the recording material, and can be retracted from the paper feed roller by rotating. Therefore, when a paper jam or the like occurs, the recording material can be easily removed. On the other hand, the arrangement positions of the first guide roller and the second guide roller may be out of order. Since the first guide roller presses the recording material against the paper feeding roller as the recording material guiding member (concave curved surface) separates from the paper feeding roller, the recording material guiding member does not return to an appropriate position. However, the traveling direction of the recording material can be appropriately regulated.
[0019]
A recording apparatus according to a seventh aspect of the present invention is a recording apparatus that performs recording on a recording material, and includes the sheet feeding device according to any one of the first to sixth aspects.
According to the invention as set forth in claim 7 of the present application, the recording apparatus includes the paper feeder as set forth in any one of claims 1 to 6 of the present invention. 6 can obtain the same operation and effect as the invention described in any one of 6.
[0020]
The recording apparatus according to the eighth aspect of the present invention is the recording apparatus according to the seventh aspect, wherein the recording medium is fed from the front side of the recording apparatus, and the recording medium is reversed and curved by the feeding path having the substantially U-shape. The recording medium on which the recording has been performed is discharged again toward the front side of the recording apparatus.
According to the invention of claim 8 of the present application, the recording material is fed from the front side of the recording apparatus, and the recording material is reversed and curved by the feeding path having the substantially U-shape to perform the recording. In a recording apparatus having a configuration in which the recording material is discharged again toward the front side of the recording apparatus, it is possible to obtain the same operation and effect as the above-described invention according to any one of claims 1 to 6 of the present application. .
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
First, an overall configuration of an inkjet printer (hereinafter, referred to as a “printer”) 100 as a “recording device” according to an embodiment of the present invention will be outlined with reference to FIG. Here, FIG. 1 is a schematic side sectional view of the printer 100.
[0022]
In FIG. 1, a printer 100 feeds printing paper (single-sheet paper, hereinafter simply referred to as “paper”) P as a “recording material” to a recording unit by a paper feeding device 50.
The sheet feeding device 50 mainly has a substantially U-shaped feeding path in side view, as a feeding path (conveying path) of the sheet P, for feeding the sheet P by inverting and bending the sheet P by the sheet feeding roller 3. A sheet feed tray 1 is provided at the start side of the U-shaped feeding path, and sheets P are fed out of the sheet feeding tray 1 one by one by a sheet feeding roller 3 and provided at the end side of the U-shaped feeding path. The paper is fed to a transport roller (paper feed roller) 6.
[0023]
A plurality of paper feed rollers 3 are attached to the paper feed roller shaft 3a, and are rotated (forward and reverse) by a drive motor (not shown) around the paper feed roller shaft 3a.
A rubber material (not shown) is wound around the roller surface of the paper feed roller 3, and the paper P is wound around the surface.
[0024]
The paper feed tray 1 has a configuration capable of storing a plurality of stacked sheets of paper P, and a hopper 2 serving as the bottom of the paper feed tray 1 is disposed below the paper feed tray 1. The hopper 2 has a hopper rotating shaft (not shown) at the bottom of the sheet feeding tray 1 and is provided so as to be swingable clockwise and counterclockwise in FIG. 1 around the hopper rotating shaft. . A hopper spring 18 for urging the hopper 2 upward is attached to the hopper 2 so that the paper P stacked on the hopper 2 can be pressed against the paper feed roller 3 by the urging force of the hopper spring 18. Has become.
[0025]
The hopper 2 is pushed down by a hopper pressing means (not shown) to a substantially horizontal state as shown in FIG. 1 against the urging force of the hopper spring 18, and the paper P stacked on the hopper 2 3 is maintained at a distance from the roller surface. On the other hand, when the pressing state of the hopper 2 by the hopper pressing means is released, the hopper 2 swings counterclockwise in FIG. 1 around the hopper rotation axis by the urging force of the hopper spring 18, whereby The paper P stacked on the hopper 2 is pressed against the roller surface of the paper feed roller 3. When the paper feed roller 3 rotates counterclockwise in FIG. 1 in the pressed state, the uppermost sheet P (the sheet P in FIG. 1) is rotated. _u ) Is fed.
[0026]
Next, a pad holder 11 having a separation pad 11a is provided below the paper feed roller 3. The pad holder 11 is provided so as to be swingable clockwise and counterclockwise in FIG. 1 around a rotation shaft 11 b, and is rotated in a direction in which the separation pad 11 a is pressed against the paper feed roller 3 by the pad spring 10. Being energized. The pad holder 11 presses the separation pad 11a against the roller surface of the paper feed roller 3 by the urging force of the pad spring 10 during the paper feeding operation. The separation pad 11a is configured to swing in a direction in which the separation pad 11a is retracted from the paper feed roller 3.
[0027]
Subsequently, a paper feed driven roller 4 is provided on the back side of the paper feed roller 3 in FIG. The paper feed driven roller 4 is provided so as to be able to advance and retreat with respect to the paper feed roller 3, and at the time of paper feeding, is pressed against the roller surface of the paper feed roller 3 to nip the paper P with the paper feed roller 3. I do. During printing, the pressing is released to reduce the transport load.
[0028]
Around the paper feed roller 3, there are concave curved surfaces 16 a and 17 d respectively along the outer peripheral surface of the paper feed roller 3, and the recording material that guides the sheet P to the downstream side by the concave curved surfaces 16 a and 17 d. A first paper guide member 16 and a second paper guide member 17 as “guide members” are provided at a fixed distance from the outer peripheral surface of the paper feed roller 3. The first paper guide member 16, the second paper guide member 17, and the paper feed roller 3 are used to feed the paper P by bending and reversing the paper P (hereinafter, this portion is referred to as a “reversed curved section”). To form
[0029]
Here, on the concave curved surface 17d of the second paper guide member 17, a guide roller 15a that is driven to rotate in contact with the paper P, a guide roller 15b as a "second guide roller", and a "first guide" Guide rollers 15c as "rollers" are sequentially provided toward the downstream in the feeding direction. The leading end of the paper P advances downstream while contacting the concave curved surfaces 16a and 17d when passing through the reverse curved section. However, the guide rollers 15a to 15c contact the paper P and are driven to rotate. The load when the paper P advances while contacting the concave curved surfaces 16a and 17d is reduced. In addition, the guide rollers 15b and 15c also have a function of regulating the traveling direction of the leading end of the sheet P toward the transport roller 6 through the reverse curved section, which will be described later in detail.
[0030]
Next, downstream from the reversing curved section, a transport driven roller holder 18 is provided upward, and a third paper guide member 19 is provided vertically below such that the third paper guide member 19 faces vertically. The transport driven roller holder 18 has a substantially U-shaped shape in a side view, and the lower surface thereof forms a linear paper P feeding path with the third paper guide member 19.
[0031]
A paper detection lever 13 is mounted between the paper feed roller 3 and the transport roller 6. The paper detection lever 13 has a substantially “U” shape when viewed from the side, is rotatable about a substantially central rotation shaft 13 a, and has a lower end portion for feeding the paper P. It is provided to cross. Then, when the leading edge of the sheet P passes, the sheet detecting lever 13 rotates so as to be pushed upward, and this is detected by a detection unit (not shown). The size of the sheet P can be detected by passing the rear end of the sheet P.
[0032]
Subsequently, downstream of the third paper guide member 19, a transport roller 6 that transports the paper P at a constant pitch is provided. The transport roller 6 includes a transport drive roller 6a that is rotationally driven, and a transport driven roller 6b that is pressed against the transport drive roller 6a and is driven to rotate. The pair of rollers nip the sheet P, and The paper P is transported at a constant pitch to the downstream side by the rotation of the transport drive roller 6a.
The transport driven roller 6b is supported at the downstream end of the transport driven roller holder 18 described above.
[0033]
Downstream of the transport roller 6, a recording head 8b and a platen 9 are provided so as to face up and down. The recording head 8 b is provided at the bottom of the carriage 8 that reciprocates in the main scanning direction while being guided by a carriage guide shaft 12 that extends in the main scanning direction (the front and back direction of the paper surface of FIG. 1). Ink is ejected to P. The platen 9 supports the paper P from below, thereby defining the distance between the printing surface of the paper P and the recording head 8b.
[0034]
A discharge roller 7 that discharges the sheet P on which recording has been performed is provided downstream of the recording head 8b. The paper discharge roller 7 includes a paper discharge drive roller 7a that is driven to rotate, and a paper discharge driven roller 7b that is driven and rotated in contact with the paper discharge drive roller 7a. The pair of rollers nip the paper P. The paper P is discharged by the rotation of the paper discharge drive roller 7a.
[0035]
By the way, the printer 100 takes out the paper P (cut sheet) from the paper feed cassette 1 arranged at the lower part as described above, and feeds the paper P by inverting and bending the paper P by the paper feed roller 3 to feed the paper P in a side view. It mainly has a feeding path, but has two other feeding paths (second and third feeding paths) for feeding the recording material from above the sheet feeding device 50. .
[0036]
The other two feeding paths merge with the above-described substantially U-shaped feeding path near the end position of the reverse curved section. More specifically, a paper guide member 20 is provided in an inclined position above the paper guide 17 (see also FIG. 2). _t Is formed between the third paper guide member 19 and the conveyance driven roller holder 18 to form a second paper supply path. Further, a roll paper roll R wound in a roll shape is rotatably supported behind the second paper guide member 17 (see FIG. 2). _r The third feeding in which the roll paper indicated by is passed under the paper guiding member 20 and between the third paper guiding member 19 and the transport driven roller holder 18 in the same manner as in the above-described second feeding path. A path has been formed.
[0037]
The outline of the printer 100 has been described above. Hereinafter, the regulation of the traveling direction of the sheet P by the guide rollers 15b and 15c will be described in detail with reference to FIGS. Here, FIGS. 2 and 3 are schematic side sectional views of the entire printer 100, and FIGS. 4 and 5 are side sectional views of a main part of the printer 100 (partly enlarged view of FIG. 1).
[0038]
First, the function of the second paper guide member 17 that supports the guide rollers 15b and 15c will be described with reference to FIGS. The second paper guide member 17 guides the paper P to the downstream side by the concave curved surface 17d as described above, but in order to easily remove the paper when a paper jam occurs with the paper feed roller 3. By rotating about the rotation shaft 17a, the concave curved surface 17d is retracted from the paper feed roller 3 as shown in the change from FIG. 2 to FIG. 3, and the paper feed roller 3 can be exposed. ing.
[0039]
Next, the guide rollers 15b and 15c will be described in detail with reference to FIGS. As shown in FIG. 4, the guide rollers 15b and 15c are pivotally supported by a swing member 22 that is swingably provided on the second paper guide member 17, and the guide roller 15c is located at the most downstream side of the curved section. The guide roller 15b is located upstream of the guide roller 15b.
[0040]
The swinging member 22 is provided by a protrusion 22 a being loosely inserted into a vertically elongated hole 17 c formed in the second paper guide member 17. The swinging member 22 has a bar spring 23, and one end of the bar spring 23 is provided so as to elastically contact the spring contact portion 17 b of the second paper guide member 17, so that the whole is directed vertically downward. It is in a state of being energized.
[0041]
Here, the guide rollers 15b and 15c have a function of regulating the traveling direction of the sheet P that has exited the reverse curved section. That is, when the sheet P exits the reverse curved section, the leading end of the sheet P tends to be diagonally upward and to the left in FIG. 4 in order to correct the curved state and return to the original state. Try to move away from the surface). Then, the leading end of the sheet P may eventually come into contact with the transport driven roller holder 18, thereby causing a paper jam. Therefore, the guide rollers 15b and 15c regulate such behavior of the sheet P, and the tangents of the guide rollers 15b and 15c are set so that the advancing direction of the leading end of the sheet P is straight toward the transfer roller 6. Both rollers are arranged so as to be directed straight to the roller. With such an arrangement, it is possible to prevent a problem that the leading end of the paper P advances upward after exiting the curved section and abuts on the conveyance driven roller holder 18 to cause a paper jam. .
[0042]
Next, when the second paper guide member 17 is mounted, the position of the guide roller 15b is determined by elastically contacting the paper feed roller 3 by the functions of the long hole 17c and the bar spring 23. ing. That is, since the swing member 22 is vertically displaced by the rod spring 23 while being displaceable in the vertical direction by the long hole 17c, the guide roller 15b elastically contacts the paper feed roller 3 by this, and Is determined.
[0043]
On the other hand, the second paper guide member 17 is rotatable about a rotation shaft 17a (see FIG. 2) so as to easily remove the paper when a paper jam occurs as described above. Thus, the arrangement positions of the guide rollers 15b and 15c change with the rotation of the second paper guide member 17.
[0044]
Here, FIG. 5 shows that the second paper guide member 17 is not mounted in an appropriate state, and the distance between the concave curved surface 17d and the outer peripheral surface of the paper feed roller 3 is slightly larger than the appropriate state (the state shown in FIG. 4). This shows a state in which the state is as follows. As described above, when the second paper guide member 17 is not properly mounted, the arrangement positions of the guide rollers 15b and 15c also change, and in some cases, the paper This means that the direction of travel cannot be properly regulated. However, since the position of the guide roller 15b is determined by elastically contacting the outer peripheral surface of the feed roller 3 as described above, the feed roller 15b is moved within a range in which the swinging member 22 can be displaced in the vertical direction. The displacement of the mounting position of the second paper guide member 17 with respect to the third paper guide member 3 can be absorbed, and the guide roller 15b is arranged at the correct position.
Therefore, as described above, the guide rollers 15b and 15c can be attached with high simplicity, low cost, and high accuracy without improving the component accuracy and the assembly accuracy.
[0045]
In addition, as shown in FIGS. 4 and 5, as the second paper guide member 17 separates from the paper feed roller 3, the swing member 22 is caused to move by the urging force of the bar spring 23 to guide the guide roller 15b (more specifically, 4 and 5, that is, the guide roller 15 c swings in the direction in which the guide roller 15 c approaches the paper feed roller 3. . Therefore, even if the second paper guide member 17 is mounted with the second paper guide member 17 slightly separated from the paper feed roller 3 as shown in FIG. 5, the tangential direction between the guide roller 15b and the guide roller 15c does not face upward. Therefore, the traveling direction of the leading end of the sheet P can be always maintained in an appropriate state. Further, in the present embodiment, since the transport roller 6 is positioned in the traveling direction of the sheet P in a state where the guide roller 15c presses the sheet P by the swinging member 22 swinging, the sheet P The paper P can be appropriately fed to the transport roller 6 without causing the paper P to advance in an unintended direction and causing a paper jam.
[0046]
By the way, since the sheet P has a reverse curved section, the sheet P is easily affected by an obstacle existing on the feeding path on the downstream side from the reverse curved section. That is, the sheet P is likely to bend in the reversing curved portion, and when the sheet detecting lever 13 is in contact with the leading end of the sheet P downstream from the reversing curved section as in the present embodiment, the leading end of the sheet P is When the sheet P comes into contact with the sheet detection lever 13, the reversing curved portion easily bends, whereby the leading end of the sheet P temporarily stops at the sheet detection lever 13. This causes a problem that the smooth feeding of the paper P is hindered and that accurate detection of the passage of the paper P cannot be performed.
[0047]
However, the swing member 22 can swing around the guide roller 15b as a fulcrum in the state shown in FIG. 4, and when the sheet P comes into contact with the concave curved surface 22b of the swing member 22, the urging force of the bar spring 23 is applied. As a result, the reverse curved portion of the sheet P is pressed from the outside by the concave curved surface 22b, whereby the sheet P can be strongly advanced from the reverse curved portion to the end. That is, since the swinging member 22 has an assisting function of assisting the advancing force of the sheet P, even if the sheet P has a feeding path that forms a reverse curved portion, the sheet P can be appropriately rotated. It becomes possible to feed.
[0048]
【The invention's effect】
As described above, according to the present invention, in the first guide roller and the second guide roller that regulate the traveling direction of the sheet P exiting the reverse curved section, both rollers are attached to the swing member, Since the swing member makes the second guide roller elastically contact the paper feed roller, the positions of the second guide roller and the first guide roller downstream therefrom are easily determined, and high component accuracy and high assembly accuracy are achieved. And the first guide roller and the second guide roller can be arranged at low cost and with high accuracy. The swinging direction of the swinging member is such that the first guide roller presses the recording material toward the sheet feeding roller as the recording material guide member provided with the swinging member moves away from the sheet feeding roller. Therefore, even if the recording material guide member is mounted in such a manner as to be separated from the paper feed roller, the swing member that supports the first guide roller and the second guide roller is Since the first guide roller presses the recording material toward the paper feeding roller, it is possible to appropriately regulate the traveling direction of the recording material.
[Brief description of the drawings]
FIG. 1 is a schematic side sectional view of an ink jet printer according to the present invention.
FIG. 2 is a schematic side sectional view (overall view) of the inkjet printer according to the present invention.
FIG. 3 is a schematic side sectional view (overall view) of the ink jet printer according to the present invention.
FIG. 4 is a side sectional view of a main part of the inkjet printer according to the present invention.
FIG. 5 is a side sectional view of a main part of the ink jet printer according to the present invention.
[Explanation of symbols]
1 Paper tray
2 Hopper
3 Paper feed roller
4 Paper feed auxiliary roller
6 Transport rollers
7 Discharge roller
8 carriage
8b recording head
9 Platen
10 Pad spring
11 Separation pad holder
11a Separation pad
13 Paper detection lever
15a Guide roller
15b Guide roller (second guide roller)
15c Guide roller (first guide roller)
16 First paper guide member
17 Second paper guide member
18 Conveyance driven roller holder
19 Third paper guide member
22 Swinging member
23 bar spring
50 paper feeder
100 inkjet printer
P printing paper

Claims (8)

A recording material that is wound around the outer peripheral surface and fed, thereby forming a feeding path of the recording material having a substantially U-shape in a side view, and a rotationally driven paper feed roller;
A recording material guide member having a concave curved surface along the outer peripheral surface of the paper feed roller, and guiding the recording material downstream by the concave curved surface;
A plurality of guide rollers are provided along the recording material feeding direction on the concave curved surface, and guide rollers that guide the recording material to the downstream side by being driven and rotated in contact with the recording material, A sheet feeding device that feeds the recording material one by one to a conveyance roller that conveys the recording material, which is located downstream of the feeding path,
The advancing direction of the recording material exiting the curved section in the feeding path is set to a first guide roller disposed at the most downstream side of the plurality of guide rollers and to an upstream side from the first guide roller. It is configured to be regulated by the second guide roller provided,
Swinging means provided on the recording material guide member so as to be swingable when the feeding path of the recording material is viewed from the side and to make the second guide roller elastically contact the paper feeding roller; The first guide roller and the second guide roller are pivotally supported by a member, and the swing member can swing around the second guide roller in a state of elastic contact with the paper feed roller. And, as the concave curved surface is separated from the paper feed roller, the first guide roller is configured to swing in a direction of pressing the recording material toward the paper feed roller,
A sheet feeding device characterized by the above-mentioned. 2. The sheet feeding device according to claim 1, wherein the transport roller is positioned in a recording material advancing direction in a state where the first guide roller presses the recording material toward the sheet feeding roller. . 3. The second feeding path according to claim 1, wherein the second feeding path joins the substantially U-shaped feeding path near the end position of the curved section and feeds the recording material toward the transport roller. A paper feeding device, comprising: 4. The roll paper feeder according to claim 3, wherein the roll paper feeder joins with the substantially U-shaped feed path near an end position of the curved section and feeds the rolled roll paper toward the transport roller. A sheet feeding device further comprising a path. 5. The recording material according to claim 1, wherein the swinging member presses the reversing curved portion of the recording material reversely curved by the paper feed roller from the outside, so that the recording material is removed from the reversing curved portion. It has an assist function that assists the traveling force to advance the previous feed route,
A sheet feeding device characterized by the above-mentioned. The recording material guide member according to any one of claims 1 to 5, wherein the recording material guide member is rotatably provided in a side view of a recording material feeding path, and is rotated to retract from the paper feed roller. A paper feeding device characterized in that it can be used. A recording apparatus for performing recording on a recording material, comprising: the sheet feeding device according to claim 1. 8. The recording material according to claim 7, wherein the recording material is fed from the front side of the recording apparatus, and the recording material is reversed and curved by the feeding path having the substantially U-shape. A recording apparatus having a configuration for discharging paper toward a front side of the apparatus.

Images