JP2008030927A - Paper feeding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper feeding device capable of preventing skew of recording media even when two paper feeding rollers are arranged in the direction approximately orthogonal to the feeding direction of the recording media leaving a gap. <P>SOLUTION: The paper feeding device has the paper feeding rollers 6b1, 6b2 which are rotatably supported by the other end of an arm member 6a having swingably supported one end and contact and feed a recording medium P on a paper feeding tray 3. The two paper feeding rollers 6b1, 6b2 are arranged in the direction approximately orthogonal to the feeding direction of the recording medium P leaving a gap. A rotation regulating member 58 having a contact part 58c energized and made contact with the recording medium P on a centerline C passing through the approximately middle of the two paper feeding rollers 6b1, 6b2 and in the position separated from the two paper feeding rollers 6b1, 6b2 is provided. A friction coefficient of the contact part 58c with respect to the recording medium P is set large in the direction approximately orthogonal to the feeding direction of the recording medium P and small in the feeding direction of the recording medium P. The contact part 58c is protruded and formed integrally with the rotation regulating member 58. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sheet feeding device that feeds a sheet-like recording medium placed on a sheet feeding tray by a sheet feeding roller.

  Conventionally, a paper feeding device is used in a recording device such as a copying machine, a printer, a facsimile, etc., and in the paper feeding device, a paper feeding roller is brought into contact with a sheet-like recording medium placed on a paper feeding tray, The recording medium is fed by the rotation of the paper feed roller.

At that time, as disclosed in Patent Literature 1 and Patent Literature 2, the paper feed roller is rotatably supported at the tip of an arm member supported so as to be swingable, and the rotation of the drive motor is fed via the transmission mechanism. The paper feed roller is rotated. Further, the arm member is urged by a spring or the like, and the paper feed roller is brought into contact with the recording medium.
Japanese Patent Laying-Open No. 2005-298115 (see FIG. 6) JP 2002-249248 A

  However, in such a conventional paper feeding device, in order to ensure the feeding of the recording medium, two paper feeding rollers are provided in a direction substantially perpendicular to the feeding direction of the recording medium. The recording medium is skewed due to the difference between the two paper feed rollers.

  For example, there is a backlash between a driven shaft to which two paper feed rollers are attached and an arm member that rotatably supports the driven shaft, the driven shaft is shaken, the recording medium is skewed, In addition, when there is a difference between the diameters of the two paper feed rollers due to manufacturing errors or when there is a difference in friction due to contact between the two paper feed rollers and the recording medium, the two paper feed rollers There is a problem that the recording medium is skewed due to the unbalance.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a paper feeding device that can prevent skew of a recording medium even if two paper feeding rollers are provided in a direction substantially perpendicular to the feeding direction of the recording medium. There is to do.

  In order to achieve this problem, the present invention has taken the following measures in order to solve the problem. That is, a paper feed tray on which a sheet-like recording medium is placed, an arm member supported at one end so as to be swingable, and rotatably supported at the other end of the arm member. A paper feeding roller that feeds the recording medium in contact with the recording medium, wherein the paper feeding roller is substantially perpendicular to the feeding direction of the recording medium. A contact portion that is urged and contacted with the recording medium on a center line passing through substantially the middle of the two paper feed rollers and at a position away from the paper feed roller is provided. The contact portion has a friction coefficient with the recording medium that is large in a direction substantially perpendicular to the feeding direction of the recording medium and small in the feeding direction of the recording medium. That is the paper feeding device.

  The contact portion may be a roller rotatably supported by the rotation restricting member. Alternatively, the contact portion may be formed integrally with the rotation restricting member and protruded toward the recording medium. In that case, you may provide the some protrusion along the said feed direction which contacts the said to-be-recorded medium in the said contact part.

  The rotation restricting member is swingably supported by the arm member, and a recess is formed in the bottom surface of the paper feed tray so that the contact portion enters when the recording medium does not exist. The member is provided with a gear transmission mechanism for transmitting the rotation of the drive gear to the paper feed roller, and further, the rotation transmission by the gear transmission mechanism is caused by the swing of the rotation restricting member when the contact portion enters the recess. It is good also as a structure which provided the clutch mechanism which interrupts | blocks. Alternatively, the rotation restricting member is swingably supported by the arm member, and a recess is formed on the bottom surface of the paper feed tray so that the contact portion enters when the recording medium does not exist. The arm member is provided with a gear transmission mechanism for transmitting the rotation of the drive gear to the paper feed roller, and the arm member is lifted by swinging of the rotation restricting member when the contact portion enters the recess. The paper feed roller may be configured to idle.

  In the paper feeding device of the present invention, the two paper feeding rollers are provided in a direction substantially perpendicular to the feeding direction of the recording medium so that the two paper feeding rollers and the recording medium are in contact with each other. Even if a rotational moment is applied to the recording medium without being symmetric with respect to the center line, the rotational moment is canceled by the frictional force caused by the contact between the contact portion and the recording medium. There is an effect that skewing can be prevented.

  In addition, by using a roller for the contact portion, the friction coefficient in the feeding direction of the recording medium can be made very small, so the load on the transport motor can be reduced. Alternatively, by making the contact portion integral with the rotation restricting member, the contact portion has a simple configuration and can be easily formed. At this time, by providing a plurality of protrusions at the contact portion, the friction coefficient in the direction substantially perpendicular to the feeding direction of the recording medium can be easily increased.

  Furthermore, when the contact part enters the recess of the paper feed tray, the clutch mechanism prevents the transmission of rotation by the gear transmission mechanism, thereby preventing the paper feed roller from rotating while contacting the bottom surface of the paper feed tray. it can. Alternatively, when the contact portion enters the recess of the paper feed tray, the paper feed roller can be prevented from rotating while contacting the bottom surface of the paper feed tray by lifting the arm member and causing the paper feed roller to idle.

The best mode for carrying out the present invention will be described below in detail with reference to the drawings.
FIG. 1 is a perspective view illustrating an appearance of a multifunction machine 1 using the sheet feeding device according to the present embodiment, and FIG. 2 is an enlarged side sectional view of the multifunction machine 1. In the following description, the vertical direction is expressed with reference to the state shown in FIGS. 1 and 2, and the front-rear direction is expressed with the side on which a paper feed tray 3 described later is provided as the front side (front). The left and right directions are expressed when the multifunction device 1 is viewed from the front side (front side).

  This multifunction device 1 has an image recording function, an image reading function, a color copy function, a facsimile function, and the like. As shown in FIGS. An image reading device 12 used for reading is provided.

  The image reading device 12 is of a sheet feed type, and is fed between a document feed roller 14 and a document discharge roller 16 by a pair of upper and lower document feed rollers 14 and a pair of upper and lower document discharge rollers 16. The contact image sensor 18 for reading a document reads an image written on the document and outputs an image signal.

  On the other hand, a recording apparatus 7 is provided in the apparatus main body 2 below the image reading apparatus 12, and a paper supply apparatus 11 for supplying a sheet-like recording medium P such as paper is provided at the bottom of the apparatus main body 2. Is provided.

  The recording apparatus 7 is equipped with an ink jet recording head 4 that records an image on a recording medium P by ejecting ink from the lower surface, and the recording head 4 is mounted, and can reciprocate in a direction perpendicular to the paper surface of FIG. The carriage 5 is provided. In the recording apparatus 7, a platen 26 is provided on the lower surface of the recording head 4 in the carriage 5. The platen 26 has a flat shape extending in the left-right direction and supports the recording medium P from below so as to face the recording head 4. .

  As shown in FIG. 2, on the upstream side of the platen 26 in the paper discharge direction (arrow B direction), conveyance (resist) for conveying the recording medium P to the upper surface of the platen 26 (lower surface of the recording head 4). As the rollers, a driving roller 34 and a nip roller 36 facing the driving roller 34 from below are arranged. Further, on the downstream side of the platen 26 in the paper discharge direction (arrow B direction), a paper discharge roller 28 that is driven to convey the recording medium P that has passed through the recording device 7 to the paper discharge unit 10 along the paper discharge direction. A spur roller 29 urged toward the paper discharge roller 28 is disposed opposite to the spur roller 29.

  A paper discharge unit 10 on which the recording medium P on which an image is recorded by the recording device 7 is discharged with its recording surface facing upward is disposed on the upper side of the paper supply device 11, and a paper discharge port 10 a is in the main body 2. It is opened in common with the front opening 2a. The recording medium P discharged from the paper discharge unit 10 in the paper discharge direction (arrow B direction) is stacked and accommodated on a paper discharge tray 10b located inside the opening 2a.

  The paper feeding device 11 has a box-like shape with an opening at the top, and a paper feeding tray 3 that accommodates the recording medium P placed thereon via an opening 2 a formed on the front side of the device main body 2. The apparatus main body 2 is detachably provided in the front-rear direction.

  In the present embodiment, the paper feed tray 3 is a recording medium P such as A4 size, letter size, legal size, postcard size, etc., whose short side (width) is orthogonal to the feeding direction (front-rear direction, arrow A direction). A plurality of sheets can be placed and accommodated in a direction extending in the direction (left-right direction). In the present embodiment, the sheet-like recording medium P includes not only paper but also all transported bodies such as resin as long as recording is performed.

  The paper feed tray 3 is formed to be extendable and contractible in the direction parallel to the recording medium P to be placed, and a part of the paper feed tray 3 is pulled out to the outside on the front side of the apparatus main body 2 as shown in FIG. It is formed so that it can be. In the present embodiment, an A4 size recording medium P can be placed on the paper feed tray 3 that protrudes outside the apparatus main body 2.

  A cover member 41 is swingably supported on the front side of the apparatus body 2. The cover member 41 is formed in a substantially flat plate shape, and the width in the left-right direction of the cover member 41 is substantially the same as the width in the left-right direction of the opening 2 a of the apparatus body 2.

  The cover member 41 is swung from a state in which the cover member 41 is erected in the vertical direction as shown by a thin line in FIG. 2 to a state in which the cover member 41 is tilted almost horizontally to the front side as shown by a solid line in FIG. The paper feed tray 3 drawn to the front side is covered with a cover member 41 to prevent dust and dust from entering.

  As shown in FIG. 2, an inclined separation plate 8 for paper separation is disposed on the back side (rear end side) of the paper feed tray 3. The inclined separation plate 8 is formed in a convex curved shape in plan view so as to protrude at the center in the width direction (left-right direction) of the recording medium P and to recede toward the left and right ends of the recording medium P in the width direction. At the center of the recording medium P in the width direction, a sawtooth elastic separation pad (not shown) for promoting separation by contacting the leading edge of the recording medium P is provided.

  The recording medium P separated by the paper feeding device 11 so as to proceed along the feeding direction (the direction of arrow A) is laterally formed in the gap between the first conveyance path body 30 and the second conveyance path body 32. The paper is transported to a substantially U-shaped transport path 9 and fed to a recording device 7 provided above the paper feed tray 3.

  In the paper feeding device 11, one end of an arm member 6 a for feeding the recording medium P from the paper feeding tray 3 is disposed around the drive shaft 6 d parallel to the recording medium P on the apparatus main body 2 side. The arm member 6a is supported so as to be swingable in the vertical direction, and two paper feed rollers 6b1 and 6b2 are rotatably supported on the other end of the arm member 6a.

  The arm member 6 a is brought into contact with the recording medium P placed on the paper feed tray 3 by the weight of the paper feed rollers 6 b 1, 6 b 2, etc. or the urging force of a spring (not shown). The paper feed rollers 6b1 and 6b2 and the elastic separation pad of the inclined separation plate 8 described above cooperate to separate and convey the recording media P loaded on the paper feed tray 3 one by one.

  3 is an enlarged perspective view of the arm member 6a provided with the paper feed rollers 6b1 and 6b2 according to the present embodiment. FIG. 4 is an enlarged side view of the arm member 6a provided with the paper feed rollers 6b1 and 6b2 according to the present embodiment. FIGS. 5 and 5 are enlarged bottom views of the arm member 6a provided with the sheet feeding rollers 6b1 and 6b2 according to the present embodiment. FIG. 6 is a schematic configuration diagram of the arm member 6a, the gear transmission mechanism 6c, and the rotation restricting member 58 of the present embodiment. FIG. 7 is a recording medium of the two paper feed rollers 6b1 and 6b2 and the contact portion 58c of the present embodiment. It is explanatory drawing which shows the contact to P.

  The two paper feed rollers 6b1 and 6b2 are fixed to both ends of the driven shaft 51, respectively, and the driven shaft 51 is rotatably supported by the distal end portion of the arm member 6a supported by the drive shaft 6d. The two paper feed rollers 6b1 and 6b2 are respectively arranged on both sides of the arm member 6a, and the two paper feed rollers 6b1 and 6b2 are provided in a direction substantially orthogonal to the feeding direction of the recording medium P. Opened.

  A gear 52 is fixed to one end of the drive shaft 6d, and the rotation of a conveyance motor (not shown) is transmitted to the gear 52, so that the drive shaft 6d is rotationally driven. A drive gear 54 is integrally attached to the drive shaft 6d, and a driven gear 56 is integrally attached to the driven shaft 51.

  A gear transmission mechanism 6c is provided in the arm member 6a, and the rotation of the drive gear 54 is transmitted to the driven gear 56 via the gear transmission mechanism 6c. In the present embodiment, the gear transmission mechanism 6c includes first to fourth intermediate gears 6c1, 6c2, 6c3, and 6c4. The first to fourth intermediate gears 6c1, 6c2, 6c3, 6c4 are rotatably supported by the arm member 6a, the first intermediate gear 6c1 is engaged with the drive gear 54, and the fourth intermediate gear 6c4 is driven. The first to fourth intermediate gears 6c1, 6c2, 6c3, and 6c4 are sequentially engaged with the gear 56, respectively. The arm member 6a is formed in a substantially box shape having an open top, and a gear train extending from the drive gear 54 to the driven gear 56 is accommodated in the box.

  A cam (not shown) is formed on the side wall of the paper feed tray 3, and a cam follower portion 6e is formed integrally with the arm member 6a. When the paper feed tray 3 is pulled out of the apparatus main body 2, the cam moves the cam follower portion 6e. Accordingly, the paper feed rollers 6 b 1 and 6 b 2 are swung upwardly from the paper feed tray 3. This prevents the paper feed rollers 6b1 and 6b2 from colliding with the paper feed tray 3 when the paper feed tray 3 is taken in and out.

  As shown in FIG. 6, a rotation restricting member 58 is supported on the distal end side of the arm member 6 a so as to be swingable around a fulcrum pin 59. The rotation restricting member 58 is raised from the fulcrum pin 59 toward the rear side in the feeding direction of the recording medium P, and is raised obliquely upward from the rear end of the flat portion 58a toward the arm member 6a. And an inclined portion 58b.

  Further, the rotation restricting member 58 includes a contact portion 58c protruding from the flat portion 58a toward the recording medium P. As shown in FIG. 7, the two paper feed rollers 6b1 and 6b2 are arranged with the arm member 6a therebetween and spaced in the direction substantially perpendicular to the feeding direction of the recording medium P. 58c is arranged on a center line CL parallel to the feeding direction passing through the intermediate point 60 of the two sheet feeding rollers 6b1 and 6b2. The intermediate point 60 is a point substantially in the middle of the contact point of the two paper feed rollers 6b1 and 6b2 that are in contact with the recording medium P with the recording medium P, and is a virtual point on the recording medium P. It is.

  Further, the contact portion 58c is disposed at a position away from the intermediate point 60, and it is preferable that the distance from the contact portion 58c to the intermediate point 60 is large. However, if a large distance is ensured, the rotation restricting member 58 becomes large. Therefore, the contact portion 58c may be provided to the extent that the rotation restricting member 58 does not become larger than the arm member 6a. In addition, it is preferable that the contact portion 58c be in contact with the recording medium P until the leading end of the recording medium P is sandwiched between the driving roller 34 and the nip roller 36 when the recording medium P is inserted. .

  The rotation restricting member 58 is urged so that the contact portion 58 c contacts the recording medium P by its own weight, spring urging force, or the like. Further, the friction coefficient μ between the contact portion 58c and the recording medium P is large in the direction substantially orthogonal to the feeding direction of the recording medium P, and is small in the feeding direction of the recording medium P. In the present embodiment, the cross-sectional shape perpendicular to the recording medium P including the center line CL is such that the contact portion 58c is formed in a triangular shape, and the tip of the contact portion 58c contacting the recording medium P is formed in an arc shape. The friction coefficient μ in the feeding direction with the recording medium P is reduced. In addition, the width of the contact portion 58c in the direction orthogonal to the feeding direction of the recording medium P is formed substantially constant, and the cross-sectional shape orthogonal to the center line CL is formed in a substantially rectangular shape. The friction coefficient μ is formed to be large. Note that the recording medium P may be arranged so that the middle in the width direction coincides with the center line CL.

Next, the operation of the sheet feeding device 11 of the present embodiment described above will be described.
First, when an image is recorded on the A4-sized recording medium P, the recording medium P is placed on the paper feeding tray 3 and the paper feeding tray 3 is mounted on the apparatus main body 2. Further, the cover member 41 is swung to cover the paper feed tray 3 with the cover member 41.

  When recording on the recording medium P, the recording medium P from the paper feed tray 3 is separated and conveyed one by one by the paper feeding rollers 6b1 and 6b2 and the elastic separation pad of the inclined separation plate 8. The recording medium P is fed to the recording device 7 via the transport path 9 and ink is ejected from the recording head 4 in accordance with image data read by the image reading device 12, and an image is recorded on the recording medium P. Record. The recording medium P that has passed through the recording device 7 is transported to the paper discharge unit 10 along the transport path 9.

  When the recording medium P is fed by the two paper feeding rollers 6b1 and 6b2, if the two paper feeding rollers 6b1 and 6b2 are not balanced, an acting force that causes the recording medium P to skew is applied. For example, there is a backlash or the like between the driven shaft 51 to which the two paper feed rollers 6b1 and 6b2 are attached and the arm member 6a that rotatably supports the driven shaft 51, and the driven shaft 51 is the intermediate point described above. When rocking around 60, the contact between the two paper feed rollers 6b1 and 6b2 and the recording medium P is not symmetric with respect to the center line CL, and is in an unbalanced state. When the two paper feed rollers 6b1 and 6b2 are rotationally driven in this unbalanced state, a rotational moment M about the intermediate point 60 acts on the recording medium P, and the recording medium P is skewed. The acting force works. Further, the diameters of the two paper feed rollers 6b1 and 6b2 may differ due to manufacturing errors or the contact points between the two paper feed rollers 6b1 and 6b2 and the recording medium P may be symmetric with respect to the center line CL. If the two paper feed rollers 6b1 and 6b2 are in contact with the recording medium P in an unbalanced state, the rotational moment M about the intermediate point 60 acts on the recording medium P, and the recording medium The acting force that skews P works.

  When the recording medium P is fed, a frictional force acts between the contact portion 58 c and the recording medium P due to the contact between the contact portion 58 c and the recording medium P. Even if the rotational moment M acts on the recording medium P due to imbalance between the two paper feed rollers 6b1 and 6b2, the rotational moment M is canceled by the contact between the contact portion 58c and the recording medium P. Frictional force works.

  The friction coefficient μ between the contact portion 58c and the recording medium P is large in a direction substantially orthogonal to the feeding direction of the recording medium P. Accordingly, the frictional force that cancels the rotational moment M is large, and even if the rotational moment M occurs, the skew of the recording medium P can be prevented. Further, since the friction coefficient μ between the contact portion 58c and the recording medium P is small in the feeding direction of the recording medium P, even if the contact portion 58c is provided, an increase in the load on the transport motor can be suppressed.

  In order to cancel the rotational moment M, it is preferable that the friction coefficient μ in the direction substantially orthogonal to the feeding direction of the recording medium P is large. Further, providing the contact portion 58 c at a position away from the intermediate point 60 is advantageous for canceling the rotational moment M. When the recording medium P is nipped and fed by the drive roller 34 and the nip roller 36, skewing by the two paper feed rollers 6b1 and 6b2 is less likely to occur.

  It is difficult to manufacture and arrange the two paper feeding rollers 6b1 and 6b2 in a perfectly balanced shape so as to be symmetric with respect to the center line CL. It becomes complicated. The skew of the recording medium P can be prevented with a simple configuration provided with the contact portion 58c.

  Next, the feeding device according to the second embodiment will be described with reference to FIGS. FIG. 8 is an enlarged perspective view of the arm member 6a provided with the paper feed rollers 6b1 and 6b2 according to the second embodiment, and FIG. 9 is a diagram of the arm member 6a provided with the paper feed rollers 6b1 and 6b2 according to the second embodiment. FIG. 10 is an enlarged side view, and FIG. 10 is an enlarged bottom view of the arm member 6a provided with the sheet feeding rollers 6b1 and 6b2 of the second embodiment. In addition, about the same member as embodiment mentioned above, the same number is attached | subjected and detailed description is abbreviate | omitted. The same applies below.

  In the second embodiment, instead of the contact portion 58c integrated with the flat portion 58a described above, a contact portion 58e using a roller is used, and the roller-like contact portion 58e protrudes from the flat portion 58a of the rotation restricting member 58. The pair of rib portions 58f are rotatably supported via a rotation pin 61. The contact portion 58e is provided at the same position as the contact portion 58c described above, and the driven shaft 51 and the rotation pin 61 of the two paper feed rollers 6b1 and 6b2 are arranged in parallel.

  By using a roller for the contact portion 58e, the friction coefficient μ in the feeding direction of the recording medium P can be made very small, so that the load on the transport motor can be reduced. Further, when the outer periphery of the contact portion 58e is covered with a material having a large friction coefficient such as rubber, the friction coefficient μ in the direction substantially orthogonal to the feeding direction of the recording medium P can be made very large.

  Next, a paper feeding device according to a third embodiment different from the above-described embodiment will be described with reference to FIGS. FIG. 11 is an enlarged perspective view of the arm member 6a provided with the paper feed rollers 6b1 and 6b2 according to the third embodiment. FIG. 12 shows the arm member 6a provided with the paper feed rollers 6b1 and 6b2 according to the third embodiment. It is an enlarged bottom view.

  In the third embodiment, a plurality of protrusions 58d parallel to the feeding direction are further formed on the contact portion 58c of the above-described embodiment, and the friction coefficient in a direction substantially orthogonal to the feeding direction of the recording medium P is formed. μ is larger. As a result, the rotational moment M is further suppressed, and the skew of the recording medium P can be prevented.

Next, a feeding device according to a fourth embodiment will be described with reference to FIG. FIG. 13 is an explanatory diagram showing a schematic configuration of the fourth embodiment.
In the fourth embodiment, one end of the swing member 64 is swingably supported on the drive shaft 6d, and the first intermediate gear 6c1 meshed with the drive gear 54 at the other end of the swing member 64 is rotatable. It is supported. As shown in FIG. 13 (a), the first intermediate gear 6c1 is engaged with the second intermediate gear 6c2, and the transmission position for transmitting the rotation of the drive gear 54 to the driven gear 56 by the gear transmission mechanism 6c; As shown in FIG. 13B, the swinging member 64 can be swung to a blocking position where the first intermediate gear 6c1 is separated from the second intermediate gear 6c2 and cannot transmit rotation.

  A rotation restricting member 66 is supported on the arm member 6a so as to be swingable around the fulcrum pin 68, and a contact portion using a roller similar to that of the second embodiment described above is provided at the tip of the rotation restricting member 66. 66a is rotatably supported.

  A concave portion 70 is formed on the bottom surface of the paper feed tray 3, and the concave portion 70 has a rotation restricting member 66 when the recording medium P runs out of the paper feed tray 3 as shown in FIG. The contact portion 66a is formed at a position where the contact portion 66a enters. Then, when the contact portion 66a enters the recess 70, the rotation restricting member 66 swings, and the pin portion 66b provided at the rear end of the rotation restricting member 66 pushes up the first intermediate gear 6c1, and the second portion It is comprised so that it may be set as the interruption | blocking position spaced apart from the intermediate gear 6c2. In the present embodiment, a clutch mechanism 72 is constituted by the swing member 64, the first intermediate gear 6c1, the second intermediate gear 6c2, and the rotation restricting member 66.

  As a result, as in the above-described embodiment, even if the rotational moment M acts on the recording medium P by the two paper feed rollers 6b1 and 6b2, this rotation is caused by the contact between the contact portion 66a and the recording medium P. The frictional force works to cancel the moment M.

  The friction coefficient μ between the contact portion 66a and the recording medium P is large in a direction substantially orthogonal to the feeding direction of the recording medium P. Accordingly, the frictional force that cancels the rotational moment M is large, and even if the rotational moment M occurs, the skew of the recording medium P can be prevented.

  Further, when the recording medium P runs out of the paper feed tray 3, the contact portion 66a enters the recess 70, the rotation restricting member 66 swings, the clutch mechanism is set to the cutoff position, and the rotation of the driven gear 56 is cut off. . Therefore, even if the two paper feed rollers 6b1 and 6b2 come into contact with the bottom surface of the paper feed tray 3, the paper feed rollers 6b1 and 6b2 do not rotate. Therefore, there is a friction member such as cork on the bottom surface of the paper feed tray 3. However, it is possible to prevent noise and the like by causing the two paper feed rollers 6b1 and 6b2 to idle without being damaged.

  Alternatively, when the contact portion 66a enters the recess 70 without providing the clutch mechanism 72, the arm member 6a is lifted by the swing of the rotation restricting member 66, and the two paper feed rollers 6b1 and 6b2 are idled. By doing so, damage or noise may be prevented.

  The present invention is not limited to such embodiments as described above, and can be implemented in various modes without departing from the gist of the present invention.

1 is a perspective view illustrating an appearance of a multifunction machine using a sheet feeding device as an embodiment of the present invention. 1 is an enlarged side sectional view of a multifunction machine according to an embodiment. It is an expansion perspective view of an arm member provided with a paper feed roller of the present embodiment. It is an enlarged side view of the arm member provided with the paper feed roller of this embodiment. It is an enlarged bottom view of an arm member provided with a paper feed roller of this embodiment. It is a schematic block diagram of the arm member of this embodiment, a gear transmission mechanism, and a rotation control member. It is explanatory drawing which shows the contact to the to-be-recorded medium of the two paper supply rollers and contact part of this embodiment. It is an expansion perspective view of an arm member provided with a paper feed roller of a second embodiment. It is an enlarged side view of the arm member provided with the paper feed roller of the second embodiment. It is an enlarged bottom view of the arm member provided with the paper feed roller of the second embodiment. It is an expansion perspective view of an arm member provided with a paper feed roller of a third embodiment. It is an enlarged bottom view of an arm member provided with a paper feed roller of a third embodiment. It is explanatory drawing which shows schematic structure of 4th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... MFP 2 ... Device main body 3 ... Paper feed tray 4 ... Recording head 5 ... Carriage 6a ... Arm members 6b1, 6b2 ... Paper feed roller 6c ... Gear transmission mechanism 6c1, 6c2, 6c3, 6c4 ... Intermediate gear 6d ... Drive shaft 6e ... cam follower section 7 ... recording device 8 ... inclined separating plate 11 ... paper feeding device 12 ... image reading device 26 ... platen 51 ... driven shaft 52 ... gear 54 ... driving gear 56 ... driven gear 58, 66 ... rotation restricting member 58a ... Flat part 58b ... inclined part 58c, 58e, 66a, 66c ... contact part 58d ... ridge 59 ... fulcrum pin 60 ... intermediate point 61 ... rotating pin 64 ... oscillating member 68 ... fulcrum pin 70 ... concave part 72 ... clutch mechanism

Claims (6)

A paper feed tray on which a sheet-like recording medium is placed;
An arm member having one end swingably supported;
A paper feed roller that is rotatably supported by the other end of the arm member and feeds the recording medium in contact with the recording medium of the paper feed tray;
In a paper feeder provided with
Two paper feed rollers are provided with a gap in a direction substantially perpendicular to the feed direction of the recording medium,
A rotation restricting member having a contact portion that is urged to come into contact with the recording medium on a center line passing through substantially the middle of the two paper feeding rollers and at a position away from the paper feeding roller; The sheet feeding device, wherein the contact portion has a coefficient of friction with the recording medium being large in a direction substantially orthogonal to a feeding direction of the recording medium and being small in a feeding direction of the recording medium.   The sheet feeding device according to claim 1, wherein the contact portion is a roller rotatably supported by the rotation regulating member.   The sheet feeding device according to claim 1, wherein the contact portion is formed integrally with the rotation restricting member and protrudes toward the recording medium.   The sheet feeding device according to claim 3, wherein the contact portion includes a plurality of protrusions along the feeding direction in contact with the recording medium. The rotation restricting member is swingably supported by the arm member, and a recess is formed on the bottom surface of the paper feed tray so that the contact portion enters when the recording medium does not exist.
Further, the arm member is provided with a gear transmission mechanism that transmits the rotation of the drive gear to the paper feed roller, and further, the gear transmission mechanism is caused by swinging of the rotation restricting member when the contact portion enters the recess. The sheet feeding device according to claim 1, further comprising a clutch mechanism that blocks conduction of rotation caused by the rotation. The rotation restricting member is swingably supported by the arm member, and a recess is formed on the bottom surface of the paper feed tray so that the contact portion enters when the recording medium does not exist.
Further, the arm member is provided with a gear transmission mechanism for transmitting the rotation of the drive gear to the paper feed roller, and further, the arm member is moved by swinging of the rotation restricting member when the contact portion enters the recess. The sheet feeding device according to claim 1, wherein the sheet feeding roller is configured to lift and idle.

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