JP3083580U - Paper feeder - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prevent a "large number of avalanches phenomenon" of paper in a paper feeding device by restricting a displacement width of a pickup roller in a direction away from a paper supporting surface. SOLUTION: A friction surface 81 is provided, which abuts on a leading end 101 of a sheet leaning on a sheet supporting surface 21 to provide slip resistance. The pickup roller 6 is provided at the upper end of the movable member 5 that can swing back and forth about the horizontal axis 4. The receiving member 9 for receiving the contact portion 71 provided on the movable member 5 is
To be provided. The displacement width of the pickup roller 6 regulated by the contact of the contact portion 71 with the receiving member 9 is set within a range in which the leading ends 101 of a plurality of sheets follow and do not move to positions beyond the leading ends of the friction surfaces 81.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 According to the present invention, the pickup roller comes into contact with a sheet feeding device, in particular, one of the uppermost sheets of a large number of sheets leaning on the sheet support surface, and a feed force is applied to the sheet by rotation of the pickup roller. The present invention relates to a paper feeding device adapted to be used.

[0002]

[Prior art]

 FIG. 3 schematically shows a conventional sheet feeding apparatus of this type. In the drawing, reference numeral 1 denotes a housing, 2 denotes a paper receiver, and 3 denotes a frame. The housing 1 incorporates a movable member 5 that swings in the up-and-down direction around the horizontal axis 4 in a standing posture. The movable member 5 is formed by a vertically long case containing a gear group (an example of a rotation transmission mechanism) for transmitting the rotation of a motor (not shown), and the upper end thereof is transmitted by the gear group. A pickup roller 6 that rotates by receiving the rotation force of the motor is provided. At the lower end of the movable member 5, a pin-shaped spring receiving portion 71 located below the position where the horizontal shaft 4 is disposed is protrudingly provided. A spring body 7 composed of a coil spring is stretched between a spring receiver 72 provided on the base cover 12. The urging force of the spring body 7 constantly urges the pickup roller 6 in the direction approaching the paper support surface 21 of the paper receiver 2. Further, the frame 3 is provided with a resin member 8 called a backlash friction which is located below the paper support surface 21 of the paper receiver 2. The resin member 8 has an elongated shape in the sheet feeding direction indicated by the arrow f, and its upper surface abuts against the leading end 101 of the sheet 100 leaned against the sheet supporting surface 21 and slides on the leading end 101 of the sheet 100. It is formed as a friction surface 81 for providing resistance.

In this paper feeder, when the paper 100 is not leaned against the paper support surface 21, the paper feed roller 6 is elastically urged by the force of the spring body 7 and is in elastic contact with the paper support surface 21. When setting the paper 100 leaning on the paper support surface 21, the required number of papers 100 are divided between the paper support surface 21 and the paper feed roller 6 elastically contacting the paper support surface 21, and the paper The front end 101 of 100 is pressed against the friction surface 81. At the time of paper feeding, the paper feeding roller 6 rotates in the direction of the arrow R due to the rotational force of the motor, and the feeding force is applied to the uppermost sheet 100 with which the paper feeding roller 6 is in contact by the friction force at this time. The leading edge 101 of the paper 100 is slid over the friction surface 81 and sent out as indicated by an arrow f.

In such a sheet feeding device, when the force of the spring body 7 is too strong, the sheet 100 is divided between the sheet supporting surface 21 and the pickup roller 6 when the sheet 100 is set on the sheet supporting surface 21. This makes it difficult to set the sheet 100 and the pick-up roller 6 so that the sheet 100 cannot be easily divided when the sheet 100 is set. Conversely, if the force of the spring body 7 is too weak, the contact pressure of the pickup roller 6 against the sheet 100 becomes too small, and it becomes difficult for the feed force due to the rotation of the pickup roller 6 to be applied to the sheet 100. Therefore, the force of the spring body 7 can be easily set so that one sheet of paper 100 is inserted between the paper support surface 21 and the pickup roller 6. The force is adjusted so that the force is sufficiently applied to the sheet 100.

On the other hand, Japanese Patent Application Laid-Open No. 7-109035 (first prior art) discloses a technique for aligning the leading ends of a plurality of sheets stacked on a horizontal hopper table of a sheet feeding device. . Japanese Utility Model Application Laid-Open No. 60-47745 (second prior art) discloses that the paper stacked on a paper feed tray is pulled out on a friction plate by a pull-out roller and then pulled out on the friction plate. A technique has been disclosed in which a sheet is fed one by one by applying a feeding force to a separated sheet by a separation roller.

[0006]

[Problems to be solved by the invention]

 In the conventional paper feeder described with reference to FIG. 3, when the paper 100 leaned against the paper support surface 21 is left in a high humidity environment, for example, the paper 100 becomes wet and the leading end 101 becomes sharp. Wavy deformation may occur. If the leading end 101 of the sheet 100 is wavy deformed, the leading end 101 of the sheet 100 does not come into contact with the friction surface 81 when the feed force is applied by the pickup roller 6, or does not come into contact therewith. Even if the frictional surface 81 is used, the frictional surface 81 may slip on the frictional surface 81 without providing an appropriate sliding resistance. When such a situation occurs, not only one sheet of paper 100 with which the pickup roller 6 is in contact, but also a plurality of sheets of paper 100 overlapping below the sheet 100 following the sheet 100 are kept overlapping. The situation that it is sent occurs. In this case, since the force of the spring body 7 is adjusted as described above, one sheet 100 with which the pickup roller 6 is in contact and a plurality of sheets 100 under the sheet 100 are kept overlapping. When the paper 100 is fed, the pickup roller 6 is pushed out by the paper 100 as shown by the phantom line in FIG. 3, and the pickup roller 6 moves away from the paper support surface 21 against the force of the spring body 7 (arrow F). ), And as a result, the “multiple-sheet avalanche phenomenon” occurs in which the leading ends 101 of the plurality of sheets of paper 100 that are still overlapped are sent over the leading end 82 of the friction surface 81. A state in which such a “multiple-sheet slack phenomenon” occurs is a paper feed failure state. Under such a state, it is impossible to perform a printing process at a print destination, for example, a print area. As a result, smooth printing operation is impeded.

Here, the first prior art described above merely discloses a technique for aligning the leading ends of a plurality of sheets, and thus prevents the “multiple-sheet avalanche phenomenon” by using this technique. It is not possible.

In the second prior example, when more than two sheets of paper are pulled out on the friction plate by the pull-out roller, only one of the sheets is separated by the separation roller or the friction plate. Cannot be separated and sent out by the action of the above, so that the above-mentioned "multiple-sheet avalanche phenomenon" cannot be prevented. Further, in the second prior example, since two rollers, a draw-out roller and a separation roller, are used, the number of parts increases, the structure becomes complicated, and the price is high.

The present invention has been made under the above circumstances, and it is an object of the present invention to provide a sheet feeding device capable of preventing the above-described “multiple-sheet avalanche phenomenon” with a simple configuration.

[0010] Another object of the present invention is to provide a paper feeder capable of preventing the above-mentioned "multiple-sheet avalanche phenomenon" without increasing the number of parts.

Further, the present invention provides a paper feeder capable of preventing the above-described “multiple-sheet avalanche phenomenon” by simply adding a simple modification to the conventional paper feeder described with reference to FIG. With the goal.

[0012]

[Means for Solving the Problems]

 In the paper feeding device according to the present invention, the sliding resistance is applied to the leading edge of the paper resting on the paper supporting surface under the paper supporting surface on which a large number of sheets are stacked. And a pickup roller for applying a feed force by contacting the uppermost sheet leaning against the sheet supporting surface so as to be displaceable in a direction near and far from the sheet supporting surface. Has been deployed.

In the present invention, there is provided a displacement width regulating means for regulating a displacement width of the pickup roller in a direction away from the paper support surface, and a displacement width of the pickup roller regulated by the displacement width regulating means is provided. When a feed force is applied to one sheet that the pickup roller is in contact with, the leading ends of a plurality of sheets overlapping the lower side of the one sheet follow the friction. It is set within the range where it does not move to a position beyond the end of the surface.

According to this, in the initial stage in which the feeding force is applied to the sheet by the pickup roller, one sheet in contact with the pickup roller and a plurality of sheets overlapping below the same are kept overlapping. Even if it is sent, the displacement width of the pickup roller is regulated by the displacement width regulating means, and the regulation restricts the displacement width of the plurality of sheets overlapping the lower side of one sheet with which the pickup roller is in contact. Since the leading edge of the sheet does not move to a position beyond the leading end of the friction surface, the "multiple-sheet avalanche phenomenon" in which a large number of sheets are sent out in an overlapping manner does not occur.

In the present invention, it is desirable that the pickup roller is elastically urged by a spring body in a direction approaching the paper support surface. According to this, by adjusting the force of the spring body, it is possible to easily set a single sheet separately between the sheet supporting surface and the pickup roller, and to set the rotation of the pickup roller. And a state in which the feeding force is sufficiently applied to the sheet.

In the present invention, the displacement width restricting means is a receiving member that receives a contact portion provided on the movable member displaced together with the pickup roller and regulates the displacement width of the pickup roller. It is desirable to be provided on the fixed side member of the paper feeding device. The movable member is swingably mounted in an upright posture around a horizontal axis, the pickup roller is provided at an upper end of the movable member, and the contact portion is located at a position closer to the horizontal axis. It is preferable that the movable member is provided on the lower side of the movable member. According to this, it is possible to easily configure the displacement width regulating means by the receiving member. In particular, if a configuration is adopted in which the receiving member is provided integrally with the housing of the paper feeder, the receiving member can be configured by a projection formed on the housing, and the like. It is possible to provide a paper feeder that does not cause the “large number of avalanches phenomenon” without increasing the score.

In the present invention, the coil spring is stretched between the pin-shaped spring receiving portion protruding from the lower end of the movable member and the spring receiving portion provided in the housing. It is preferable that the contact portion and the pin-shaped spring receiving portion are shared by the same member. According to this, since it is not necessary to form the contact portion with a separate member from the pin-shaped spring receiving portion, it is possible to provide a sheet feeding device which does not cause the "large number of slanting phenomenon" without increasing the number of parts. Will be able to do it.

In the present invention, it is preferable that the friction surface is formed by a surface of a resin member which is elongated in a paper feeding direction. According to this, the friction surface can be formed at low cost.

The paper feeder according to the present invention can be configured by simply modifying the conventional paper feeder described with reference to FIG. For this purpose, for example, a friction surface that abuts against the leading edge of the paper resting on the paper supporting surface and imparts a sliding resistance to the leading edge of the paper, for example, below the paper supporting surface on which a large number of sheets are stacked and leaned. The friction surface is formed by the surface of a resin member elongated in the paper feeding direction, and a pickup roller that applies a feeding force by contacting the uppermost sheet leaning against the paper supporting surface is provided by the pickup roller. The pickup roller is provided so as to be displaceable in the near and far directions with respect to the surface, and the pickup roller is mounted so as to be swingable in the front-rear direction in an upright posture about a horizontal axis and accommodates a rotation transmission mechanism for the pickup roller. A pin-shaped spring receiver is provided at the upper end of the movable member, and is provided at the lower end of the movable member and located below the location where the horizontal axis is disposed. A spring body composed of a coil spring that elastically urges the pickup roller in a direction approaching the paper supporting surface is stretched between the paper feeding device and a spring receiving portion provided in a housing of the paper feeding device. In the paper feeder, the receiving member for restricting the displacement width of the pickup roller in a direction away from the paper supporting surface by receiving a contact portion formed by the same member as the pin-shaped spring receiving portion is formed in the housing. The displacement width of the pickup roller, which is provided integrally with the pickup member and is regulated by the receiving portion being received by the receiving member, is determined when the feeding force is applied to one sheet of paper contacted by the pickup roller. In this case, the leading edge of a plurality of sheets overlapping the lower side of the one sheet follows and does not move to a position beyond the leading end of the friction surface. It is, it is possible to adopt a configuration that.

[0020]

[Embodiment of the invention]

 FIG. 1 is a schematic configuration diagram of a paper feeding device according to an embodiment of the present invention, and FIG. 2 is a schematic configuration diagram for explaining an operation for preventing a “multiple-sheet avalanche phenomenon”.

The sheet feeding device shown in FIGS. 1 and 2 has a leading end 101 of a sheet 100 leaned on the sheet supporting surface 21 under a sheet supporting surface 21 on which a large number of sheets 100 are stacked. A friction surface 81 is provided, which abuts on the leading edge 101 of the paper 100 and provides slip resistance to the leading end 101 of the paper 100. The friction surface 81 is formed by a surface of the resin member 8 called a backlash that is elongated in the paper feeding direction f. . Further, a pickup roller 6 for applying a feeding force by contacting the uppermost sheet 100 leaned against the sheet supporting surface 21 is provided so as to be displaceable in a direction near and far from the sheet supporting surface 21. An upper end of a movable member 5 which is a vertically long case in which a pickup roller 6 is mounted so as to be able to swing back and forth in a standing posture about a horizontal axis 4 and accommodates a rotation transmitting mechanism (for example, a gear group) for the pickup roller 6. And a pin-shaped spring receiving portion 71 provided at a lower end portion of the movable member 5 and located below the location where the horizontal shaft 4 is disposed, and a spring provided in the housing 1 of the sheet feeding device. A spring body 7 composed of a coil spring that elastically urges the pickup roller 6 toward the paper support surface 21 is stretched between the receiving portion 72 and the receiving portion 72. This is the same as the conventional paper feeding apparatus described with reference to FIG. Further, other matters such as the point that the sheet supporting surface 21 is formed by the surface of the sheet receiver 2 are the same as those of the conventional sheet feeding apparatus described with reference to FIG.

The sheet feeding device shown in FIGS. 1 and 2 is different from the conventional sheet feeding device described with reference to FIG. 3 in that a receiving member 9 having an upward projection is provided on a base cover portion 12 of a housing 1. The base cover 12 and the synthetic resin are integrally formed, and the same width as the pin-shaped spring receiving member 71 is used for the displacement width when the pickup roller 6 is displaced in the direction away from the paper support surface 21. The point is that the contact portion 91 is regulated by being received by hitting the receiving member 9. The displacement width of the pickup roller 6, which is regulated by the contact portion 91 being received by the receiving member 9, is such that the feeding force is applied to one sheet 100 with which the pickup roller 6 is in contact. At this time, it is set within a range in which the leading ends 101 of the plurality of sheets 100 overlapping the lower side of the one sheet 100 do not move to a position beyond the leading end 82 of the friction surface 81.

In the paper feeder configured as described above, the pickup roller 6 comes into contact with the uppermost sheet 100 of the sheets leaning against the sheet support surface 21, and the uppermost sheet 100 is rotated by the rotation of the pickup roller 6. Feeding force is applied to one sheet of paper 100. Therefore, in an appropriate state, only the leading end 101 of one sheet of paper 100 with which the pickup roller 6 is in contact slides on the friction surface 81, overcoming the sliding resistance, and is sent out beyond the leading end 82 of the friction surface 81.

However, when the paper 100 leaned against the paper support surface 21 is left in a high-humidity environment, for example, the paper 100 may be wet and the leading end 101 may have wavy deformation. Therefore, when a feed force is applied by the pickup roller 6, the leading end 101 of the paper 100 does not contact the friction surface 81, or even if the leading end 101 is in contact with the friction surface 81, a moderate slip resistance is generated from the friction surface 81. May slip on the friction surface 81 without being applied. When such a situation occurs, not only one sheet 100 in contact with the pick-up roller 6 but also a plurality of sheets that follow the sheet 100 and overlap the lower side as shown in FIG. A situation occurs in which the sheets of paper 100a are sent while overlapping. When such a situation occurs, the pickup roller 6 is pushed out by the paper 100a as shown in FIG. 2, and the pickup roller 6 moves away from the paper support surface 21 against the force of the spring body 7 (arrow). F).

However, in this embodiment, the displacement width of the pickup roller 6 in the direction away from the paper support surface 21 (arrow F) is restricted by the receiving portion 91 being received by the receiving member 71. The displacement width is within a range in which the leading ends 101a of the plural sheets of paper 100a that remain overlapping do not move to a position beyond the leading end 82 of the friction surface 81. This eliminates the occurrence of the “multiple-sheet avalanche phenomenon” in which the leading end 101 of the paper 100 is sent over the leading end 82 of the friction surface 81. Therefore, a situation does not occur in which the paper 100 is fed out one sheet at a time, and the printing operation at the destination of the paper 100, for example, in the print area, is hindered by the “multiple-sheet avalanche phenomenon”.

In this embodiment, the receiving member 71 is an example of a displacement width regulating unit that regulates a displacement width of the pickup roller 6 in a direction away from the paper support surface 21 (arrow f). Therefore, other members can be used for the displacement width restricting means. For example, a stopper capable of restricting the displacement width of the pickup roller 6 within the above range while preventing the sheet feeding action of the pickup roller 6 from being hindered may be used as the displacement width regulating means. Alternatively, a stopper that regulates the displacement width of the pickup roller 6 that receives a predetermined portion of the movable member 5 that is displaced together with the pickup roller 6 may be used as the displacement width regulating means. As a specific example in this case, a bracket, a shaft, or the like of a motor that is a rotation driving source of the pickup roller 6 can be cited.

As can be seen from a combination of FIG. 2 for the embodiment of the present invention and FIG. 3 for the conventional paper feeder, in the embodiment and the conventional paper feeder, the pick-up roller 6 is used. Can be displaced about the horizontal axis 4 in a direction away from the paper support surface 21. In the conventional paper feeding device, a means for regulating the displacement width of the pickup roller 6 is not provided, whereas in the embodiment, the displacement width of the pickup roller 6 is regulated within the above-described range by the receiving member 9. It has become. Therefore, the displacement width of the pickup roller 6 indicated by the displacement angle θ1 in FIG. 2 is smaller than the displacement width of the pickup roller 6 indicated by the displacement angle θ2 in FIG.

[0028]

[Effect of the invention]

 As described above, according to the paper feeder of the present invention, the `` multiple-sheet avalanche phenomenon '' of paper is prevented by restricting the displacement width of the pickup roller in a direction away from the paper support surface. Since the receiving member integrally formed with the housing can be adopted as the displacement width restricting means, it is possible to prevent the "large number of avalanche phenomenon" of the paper with a simple configuration without increasing the number of parts. Therefore, not only can the paper feeding device be provided at low cost, but also the operation stability, such as the printing operation in the printing area where the paper is sent, is improved.

Further, according to the present invention, it is possible to prevent the “multiple-sheet avalanche phenomenon” of paper by simply adding a simple modification to the conventional paper feeding device described with reference to FIG. It also has the advantage of being able to.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a sheet feeding device according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram for explaining an operation of preventing a “multiple-sheet avalanche phenomenon”.

FIG. 3 is a schematic configuration diagram of a conventional sheet feeding device.

[Explanation of symbols]

 Reference Signs List 1 housing 4 horizontal axis 5 movable member 6 pickup roller 7 spring body 8 resin member 9 receiving member (displacement width regulating means) 21 paper support surface 71 spring receiving portion 72 spring receiving portion 81 friction surface 82 tip of friction surface 91 contact portion 100 Paper 101 Leading edge of paper f Paper feed direction

Claims (8)

[Utility model registration claims] An underside of a sheet supporting surface on which a large number of sheets are stacked, a friction surface which abuts on the leading end of the sheet resting on the sheet supporting surface and imparts sliding resistance to the leading end of the sheet is provided. The pickup roller is disposed, and the friction surface is formed by a surface of a resin member elongated in the sheet feeding direction, and the pickup roller that applies the feeding force by contacting the uppermost sheet leaning against the sheet supporting surface is provided on the sheet supporting surface. A movable member which is a vertically elongated case which is disposed so as to be displaceable in the near and far directions with respect to the pickup roller, and which is mounted so as to be able to swing back and forth in a standing posture about a horizontal axis, and which accommodates a rotation transmitting mechanism for the pickup roller. And a pin-shaped spring receiving portion provided at the lower end of the movable member and located below the location of the horizontal axis, and the paper feeding device. A sheet feeding device in which a spring body made of a coil spring that resiliently urges the pickup roller in a direction approaching the paper support surface is stretched between a spring receiving portion provided in a housing of the apparatus and A receiving member that regulates a displacement width of the pickup roller in a direction away from the paper supporting surface by receiving a contact portion formed by the same member as the pin-shaped spring receiving portion is provided integrally with the housing, The displacement width of the pickup roller, which is regulated by the contact portion being received by the receiving member, is such that when a feeding force is applied to one sheet contacting the pickup roller, the one sheet Is set within a range in which the leading ends of a plurality of sheets overlapping under the following surface do not move to a position beyond the leading end of the friction surface. Paper feeder. 2. A lower surface of a sheet supporting surface on which a large number of sheets are stacked, and a friction surface which abuts on the leading end of the sheet resting on the sheet supporting surface and imparts sliding resistance to the leading end of the sheet. A sheet feeder that is provided, and is provided with a pickup roller that contacts the uppermost sheet placed on the sheet support surface and applies a feeding force so as to be displaceable in a near-far direction with respect to the sheet support surface. The apparatus further includes a displacement width regulating unit that regulates a displacement width of the pickup roller in a direction away from the paper support surface, and a displacement width of the pickup roller regulated by the displacement width regulating unit is such that the pickup roller contacts the pickup roller. When a feeding force is applied to a single sheet of paper, the leading ends of a plurality of sheets overlapping below the one sheet follow the friction surface. Sheet feeding apparatus characterized by being determined in a range which will not move to a position beyond the tip. 3. The sheet feeding device according to claim 2, wherein the pickup roller is elastically urged by a spring body in a direction approaching the sheet supporting surface. 4. The displacement width regulating means is a receiving member that receives a contact portion provided on a movable member displaced together with the pickup roller and regulates the displacement width of the pickup roller. 4. The sheet feeding device according to claim 2, wherein the sheet feeding device is provided on a fixed member of the device. 5. The movable member is mounted so as to be swingable in an upright posture around a horizontal axis, the pickup roller is provided at an upper end of the movable member, and the contact portion is provided at a position where the horizontal axis is disposed. 5. The paper feeding device according to claim 4, wherein the paper feeding device is provided below the movable member. 6. The paper feeding device according to claim 5, wherein the receiving member is provided integrally with a housing of the paper feeding device. 7. The spring body is a coil spring stretched between a pin-shaped spring receiving portion protruding from a lower end of the movable member and a spring receiving portion provided on the housing. ,
7. The paper feeding device according to claim 6, wherein the contact portion and the pin-shaped spring receiving portion are shared by the same member. 8. The paper feeder according to claim 2, wherein said friction surface is formed by a surface of a resin member elongated in a paper feed direction.