RECORDING APPARATUS
There is provided a recording apparatus including: a hopper which is swingably installed on which paper sheets are placed; a feeding roller which is rotatably installed in a downstream side of the hopper in a feeding direction and feeds the recording media; a media guide surface which is opposed to an outer peripheral surface of the feeding roller with a gap therebetween; a separating roller which is installed in a downstream side of the media guide surface in the feeding direction and separates the paper sheets through cooperation with the feeding roller, in which the shortest distance between the outer peripheral surface of the feeding roller and the media guide surface in the gap becomes long along with the rotation of the feeding roller during one rotation of the feeding roller.
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1. Technical Field
The present invention relates to a recording apparatus.
2. Related Art
An ink jet printer as an example of a recording apparatus includes a mechanism feeding a plurality of paper sheets which are placed in a stacked state to a recording unit by separating the paper sheets one by one. For example, JP-A-2005-112496 includes a hopper 80 which is swung with a rocking shaft 81 of
When the hopper 80 is swung in the swinging direction D11, a plurality of paper sheets P11 on an upper part among the plurality of paper sheets P10 which are placed in the stacked state enter the gap G. The plurality of paper sheets P11 which enter the gap G stops further on an upstream side in a feeding direction E than the nip position N between the feeding roller 83 and the retard roller 85. When the feeding roller 83 of
However, there are cases where the position of the rotational axis J10 changes along with the rotation of the feeding roller 83 and the distance C between the outer peripheral surface 84 and the rotational axis J10 is not equally formed over the outer periphery depending on the dimensional accuracy of components processing. Therefore, when the feeding roller 83 of
Accordingly, a force pressing the plurality of paper sheets P11 which enter the gap G increases due to the outer peripheral surface 84 and the guide surface 82 along with the rotation of the feeding roller 83. As a result, there are problems that the plurality of paper sheets which enter the gap G, among the plurality of paper sheets P11 are transported further on a downstream side in the feeding direction E than the nip position N between the feeding roller 83 and the retard roller 85 to be multi-fed; and the driving rotation of the feeding roller 83 stops.
SUMMARYThe invention can be realized in the following forms or application examples.
APPLICATION EXAMPLE 1According to this application example, there is provided a recording apparatus including: a hopper which is swingably installed on which recording media are placed; a feeding roller which is rotatably installed in a downstream side of the hopper in a feeding direction and feeds the recording media; a medium guide surface which is opposed to an outer peripheral surface of the feeding roller with a gap therebetween; a separating roller which is installed in a downstream side of the media guide surface in the feeding direction and separates the recording media through cooperation with the feeding roller; and a recording unit which makes a record on the recording media separated by the feeding roller and the separating roller, in which the shortest distance between the outer peripheral surface of the feeding roller and the media guide surface in the gap becomes long along with the rotation of the feeding roller during one rotation of the feeding roller.
In this case, the shortest distance between the outer peripheral surface of the feeding roller and the media guide surface in the gap becomes long along with the rotation of the feeding roller during one rotation of the feeding roller. Accordingly, in the gap where the outer peripheral surface of the feeding roller and the media guide surface are opposed to each other, it is possible to suppress the distance of the gap where the outer peripheral surface of the feeding roller and the media guide surface that are opposed to each other from becoming short along with the rotation of the feeding roller depending on the dimensional accuracy of components processing. For this reason, increase of a force pressing the paper sheets, which enter the gap, caused by the outer peripheral surface of the feeding roller and the media guide surface along with the rotation of the feeding roller can be suppressed. Therefore, it is possible to suppress the recording media from being multi-fed by the feeding roller and the separating roller; the stoppage of the driving rotation of the feeding roller; and the stoppage of the printer.
APPLICATION EXAMPLE 2In the recording apparatus, the feeding roller may be configured to have a circular arc portion and a linear portion which make an approximately D shape from a side view, the outer peripheral surface viewed from a rotational axis of the feeding roller in an axis direction forms the circular arc portion, and the rotational axis is installed to be deviated from the center of the circular arc portion toward an opposite side to a starting end in the outer peripheral surface viewed from the feeding roller in the rotation direction.
In this case, in the gap where the outer peripheral surface of the feeding roller and the media guide surface are opposed to each other, it is possible to suppress the distance of the gap where the outer peripheral surface of the feeding roller and the media guide surface are opposed to each other from becoming short along with the rotation of the feeding roller depending on the dimensional accuracy of components processing. For this reason, increase of a force pressing the paper sheets, which enter the gap, caused by the outer peripheral surface of the feeding roller and the media guide surface along with the rotation of the feeding roller can be suppressed. Therefore, it is possible to suppress the recording media from being multi-fed by the feeding roller and the separating roller; the stoppage of the driving rotation of the feeding roller; and the stoppage of the printer.
APPLICATION EXAMPLE 3In the recording apparatus, the outer peripheral surface viewed from the rotational axis of the feeding roller in the axis direction may include a first outer peripheral surface that forms a portion of the circular arc portion; and a second outer peripheral surface that is continuous from the first outer peripheral surface and has a distance between the center of the circular arc portion and the second outer peripheral surface which becomes shorter as the second outer peripheral surface is located further on a finishing end side.
In this case, it is possible to suppress the distance of the space where the outer peripheral surface of the feeding roller and the media guide surface that are opposed to each other from becoming short. In addition, the distance of rotating the recording medium while being pinched by the feeding roller and the separating roller becomes long. For this reason, increase of a force pressing the paper sheets, which enter the gap, caused by the outer peripheral surface of the feeding roller and the media guide surface along with the rotation of the feeding roller can be suppressed. Therefore, it is possible to suppress the recording media from being multi-fed by the feeding roller and the separating roller; the stoppage of the driving rotation of the feeding roller; and the stoppage of the print.
The invention will be described with reference to the accompanying drawings, wherein like numbers reference like elements.
Hereinafter, embodiments of the invention will be described with reference to the drawings.
Embodiment 1In a downstream side of a feeding direction (sub scanning direction X) of the hopper 3, a feeding roller 2 is provide in a center portion in the main scanning direction Y. A separating roller 14 provided below the feeding roller 2 of
The separating roller 14 is rotated along with the feeding roller 2 when pinching a paper sheet in a nip position between the separating roller 14 and the feeding roller 2. However, the separating roller 14 is not rotated along with the feeding roller 2 when two or more paper sheets are multi-fed. For this reason, a paper sheet on an uppermost portion which comes into contact with the feeding roller 2 is fed to a downstream side in the feeding direction, conversely paper sheets other than the paper sheet on the uppermost portion which comes into contact with the feeding roller 2 are not fed to the downstream side in the feeding direction. Accordingly, it is possible to separate the multi-fed paper sheets.
A paper returning lever 8 is provided on both sides of the feeding roller 2 of
A carriage 11 that reciprocates in the main scanning direction Y in a state of being fixed to an endless belt (not shown) which is rotatively driven by a carriage motor 9 is provided in the downstream side of the feeding roller 2 in the feeding direction. The carriage 11 loads an ink cartridge 10 for accommodating ink and a recording head 15 of
A paper sheet which is fed by the feeding roller 2 and the separating roller 14 is transported in the sub scanning direction X along with a support 13 by a carrier driving roller 16 and a carrier driven roller 12 that is rotated along with the carrier driving roller 16 in a contacted manner.
Characters or images are recorded on the paper sheet which is transported in the sub scanning direction X by the ink discharged from the recording head 15 that reciprocates in the main scanning direction Y. The recorded paper sheet is discharged to the downstream side in the sub scanning direction X by a discharge driving roller 17 and a discharge driven roller 18 which is driven in contact with the discharge driving roller 17.
A recording unit 19 is configured to include the carriage 11, the recording head 15, the support 13, the carrier driving roller 16, and the carrier driven roller 12.
The feeding roller 2 is an approximately D shaped roller from a side view which has a circular arc portion and a linear portion. The feeding roller 2 has a friction layer 21 where an outer peripheral surface 21c which is capable of forming the nip portion in contact with the separating roller 14 is formed of rubber or the like; and a flat portion 21d where a portion of a circle A which is indicated with a dashed line that extends from the outer peripheral surface 21c is cut.
Central angle R1 is an angle which is opened by setting a center S1 of the circular arc as a center. The friction layer 21 is formed within the range of the central angle R1. Distances K1 from the center S1 of the circular arc to any points of the outer peripheral surface 21c are equal over the range of the central angle R1. In this embodiment, the center angle R1 is 180°.
A media guide surface 30 which is disposed with a gap B is installed in a position opposing the outer peripheral surface 21c. When the feeding roller 2 makes one rotation in a rotation direction D3, in the outer peripheral surface 21c, a side first opposing the media guide surface 30 is a starting end 21a and a side opposing the media guide surface 30 later than the starting end 21a is a finishing end 21b.
When the hopper 3 swings in the direction of arrow D1, a lower end portion of the paper sheets P placed on the hopper 3 in a stacked state is connected to the media guide surface 30 and is pushed up toward an upper side in the vertical direction Z along with an upstream side guide surface 4 (refer to
As described above, a paper sheet P is separated from the plurality of paper sheets P which enters the gap B through the cooperation of the feeding roller 2 and the separating roller 14 to be fed to the downstream side in the feeding direction along with a downstream side guide surface 31.
In this embodiment, the rotational axis J1 of the feeding roller 2 of
That is, by the time when the state of the feeding roller 2 becomes the terminal state of rotation of
Hereinafter, the printer 1 described in this embodiment includes: the hopper 3 which is swingably installed on which the paper sheets P are placed; the feeding roller 2 which is rotatably installed in the downstream side of the hopper 3 in the feeding direction and feeds the paper sheets P to the downstream side of the hopper in the feeding direction; the media guide surface 30 which is opposed to the outer peripheral surface 21c of the feeding roller 2 with the gap therebetween; the separating roller 14 which is installed in the downstream side of the media guide surface 30 in the feeding direction and separates the paper sheets P through the cooperation with the feeding roller 2; and the recording unit 19 which makes a record on the paper sheets P separated by the feeding roller 2 and the separating roller 14.
The outer peripheral surface 21c viewed from the rotational axis J1 of the feeding roller 2 in the axis direction forms a circular arc and the rotational axis J1 is installed to be deviated from the center S1 of the circular arc toward the opposite side to the starting end 21a that first opposes the media guide surface in the outer peripheral surface 21c.
By such a configuration, the shortest distance between the outer peripheral surface 21c of the feeding roller 2 and the media guide surface 30 in the gap B becomes long along with the rotation of the feeding roller 2 during one rotation of the feeding roller 2.
Accordingly, in the gap B where the outer peripheral surface 21c of the feeding roller 2 and the media guide surface 30 are opposed to each other, it is possible to suppress the distance of the gap B where the outer peripheral surface 21c of the feeding roller 2 and the media guide surface 30 are opposed to each other from becoming short along with the rotation of the feeding roller 2 in the rotation direction D3 depending on the dimensional accuracy of components processing. For this reason, the increase of the force pressing the paper sheets P, which enter the gap B, caused by the outer peripheral surface 21c of the feeding roller 2 and the media guide surface 30 along with the rotation of the feeding roller 2 can be suppressed. Therefore, it is possible to suppress the recording media from being multi-fed by the feeding roller 2 and the separating roller 14; the stoppage of the driving rotation of the feeding roller 2; and the stoppage of the printer.
Embodiment 2In Embodiment 2, a feeding roller where an outer peripheral surface that is capable of coming in contact with a separating roller is formed in a range of 180° or greater of a central angle will be described.
The outer peripheral surface 22d in a friction layer 22 of the feeding roller 2a is configured to have a first outer peripheral surface 22d1 which is formed in a range of a central angle R1; and a second outer peripheral surface 22d2 which is continuous from the first outer peripheral surface 22d1 and which is formed in a range of a central angle R2. A boundary position 22b shows a boundary position between the first outer peripheral surface 22d1 and the second outer peripheral surface 22d2.
The first outer peripheral surface 22d1 viewed from the rotational axis J2 in the axis direction forms a circular arc from a starting end 22a to the boundary position 22b. A distance K1 from a center S2 of the circular arc to any points of the first outer peripheral surface 22d1 are equal over the range of the central angle R1. In this embodiment, the center angle R1 is 180°.
In the second outer peripheral surface 22d2 viewed from the rotational axis J2 in the axis direction, a distance K2 from the center S2 of the circular arc becomes shorter as the second outer peripheral surface is located further on a finishing end 22c side that opposes the media guide surface later than the starting end 22a during one rotation of the feeding roller 2a.
The rotational axis J2 of
That is, by the time when the feeding roller 2a becomes the state that the boundary position 22b of
That is, in the feeding roller where the outer peripheral surface is formed in the position of the circle F to which the circular arc of the first outer peripheral surface 22d1 is extended, when the feeding roller is further rotated in the rotation direction D3 from the state where the boundary position 22b opposes the media guide surface 30 as in
As described above, this embodiment includes the second outer peripheral surface 22d2 where the distance K2 (refer to
Accordingly, a distance L5 in the gap B between the second outer peripheral surface 22d2 and the media guide surface 30 in the terminal state of rotation of
As described above, the outer peripheral surface 22d viewed from the rotational axis J2 of the feeding roller 2a in the axis direction in this embodiment is configured to have a first outer peripheral surface 22d1 that forms the circular arc and the second outer peripheral surface 22d2 that is continuous from the first outer peripheral surface 22d1 and has the distance K2 from the center S2 of the circular arc which becomes shorter as the outer peripheral surface is located further on the finishing end 22c side. Accordingly, it is possible to suppress the distance of the gap where the outer peripheral surface 22d of the feeding roller and the media guide surface are opposed to each other from becoming short after the feeding roller 2a is rotated at certain times and the length of the outer peripheral surface 22d in the rotation direction D3 from becoming long. Therefore, the distance of rotation while pinching the paper sheets P by the feeding roller 2a and the separating roller 14 becomes long.
For this reason, even in the range in which the second outer peripheral surface 22d2 and the media guide surface 30 are opposed to each other by the rotation of the feeding roller 2a, it is possible to suppress the distance of the gap B where the second outer peripheral surface 22d2 of the feeding roller 2a and the media guide surface 30 are opposed to each other from becoming short along with the rotation of the feeding roller 2a depending on the dimensional accuracy of components processing. For this reason, the increase of the force pressing the paper sheets P, which enter the gap B, caused by the second outer peripheral surface 22d2 of the feeding roller 2a and the media guide surface 30 along with the rotation of the feeding roller 2a can be suppressed. Therefore, it is possible to suppress the paper sheets from being multi-fed by the feeding roller 2a and the separating roller 14; the stoppage of the driving rotation of the feeding roller 2a; and the stoppage of the printer. Furthermore, the other configurations of the printer of this embodiment are the same as the configurations of the printer 1 described in Embodiment 1.
Embodiment 3In this embodiment, a feeding roller which is formed such that a distance between a rotational axis and an outer peripheral surface becomes short toward a finishing end from a starting end of the outer peripheral surface will be described.
A circle H indicated with a dashed line is a circle having a radius W with a straight line that connects a starting end 23a in the outer peripheral surface 23c on which a friction layer 23 is formed and a rotational axis J3. A distance K3 between the outer peripheral surface 23c and the rotational axis J3 becomes shorter as the outer peripheral surface is located on a finishing end 23b that opposes the media guide surface later than the starting end 23a during one rotation of the feeding roller 2c.
Accordingly, the shortest distance L6 between the outer peripheral surface 23c of the feeding roller 2c and a media guide surface 30 in a gap B becomes long along with the rotation of the feeding roller 2c during one rotation of the feeding roller 2c.
By such a configuration, in the gap B where the outer peripheral surface 23c of the feeding roller 2c and the media guide surface 30 are opposed to each other, it is possible to suppress the distance of the gap B where the outer peripheral surface 23c of the feeding roller 2c and the media guide surface 30 are opposed to each other from becoming short along with the rotation of the feeding roller 2c in a rotation direction D3 depending on the dimensional accuracy of components processing. For this reason, increase of a force pressing paper sheets P, which enter the gap B, caused by the outer peripheral surface 23c of the feeding roller 2c and the media guide surface 30 along with the rotation of the feeding roller 2c can be suppressed. Therefore, it is possible to suppress the paper sheets P from being multi-fed by the feeding roller 2c and the separating roller 14; the stoppage of the driving rotation of the feeding roller 2c; and the stoppage of the printer.
The other configurations of the printer of this embodiment are the same as the configurations of the printer 1 described in Embodiment 1. In Embodiments 1 to 3, the printer provided with the recording head 15 that ejects the ink has been explained, but such configurations are also applicable to an electrophotographic-type recording apparatus provided with a photoreceptor.
The entire disclosure of Japanese Patent Application No. 2012-277755, filed Dec. 20, 2012 is expressly incorporated by reference herein.
Claims
1. A recording apparatus comprising:
- a hopper which is swingably installed on which recording media are placed;
- a feeding roller which is rotatably installed in a downstream side of the hopper in a feeding direction and feeds the recording media;
- a media guide surface which is opposed to an outer peripheral surface of the feeding roller with a gap therebetween;
- a separating roller which is installed in a downstream side of the media guide surface in the feeding direction and separates the recording media through cooperation with the feeding roller; and
- a recording unit which make a record on the recording media separated by the feeding roller and the separating roller,
- wherein the shortest distance between the outer peripheral surface of the feeding roller and the media guide surface in the gap becomes long along with the rotation of the feeding roller during one rotation of the feeding roller.
2. The recording apparatus according to claim 1,
- wherein the feeding roller is configured to have a circular arc portion and a linear portion which make an approximately D shape from a side view,
- wherein the outer peripheral surface viewed from a rotational axis of the feeding roller in an axis direction forms the circular arc portion, and
- wherein the rotational axis is installed to be deviated from the center of the circular arc portion toward an opposite side to a starting end of the circular arc portion in the outer peripheral surface viewed from the feeding roller in the rotation direction.
3. The recording apparatus according to claim 2,
- wherein the outer peripheral surface viewed from the rotational axis of the feeding roller in the axis direction includes a first outer peripheral surface that forms a portion of the circular arc portion; and a second outer peripheral surface that is continuous from the first outer peripheral surface and has a distance between the center of the circular arc portion and the second outer peripheral surface which becomes shorter as the second outer peripheral surface is located further on a finishing end side that opposes the media guide surface later than the starting end.
Type: Application
Filed: Dec 16, 2013
Publication Date: Jun 26, 2014
Applicant: SEIKO EPSON CORPORATION (Tokyo)
Inventor: Shintaro KOMURO (Shiojiri-shi)
Application Number: 14/107,749