JPH07137874A - Sheet feeder and recorder - Google Patents

Abstract

PURPOSE:To fix a position of starting a paper feed while surely performing separation regardless of a degree in stiffness of a sheet. CONSTITUTION:In a sheet feeder, it is provided with a separating member 30 for supporting a point end corner of a sheet 26 loaded in a condition pressed from a back surface side to perform separating the sheet 26 when it is fed, and the separating member 30 is formed by having the first restricting part 30b for restricting moving in a loading direction the point end corner of the loaded sheet 26 and the second restricting part 30c for restricting moving to the downstream in a feed direction the corner of the loaded sheet 26. In this way, a feed direction downstream end part 30e of the first restricting part 30b and a loading direction upper end part 30f of the second restricting part 30c are separated, to form a clearance 30d for enabling the sheet 26 to pass through, and also the loading direction upper end part 30f of the second restricting part 30c is positioned higher than a reverse surface of the feed direction downstream end part 30e of the first restricting part 30b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a plurality of stacked recording devices (printers) as information output devices such as computers and recording devices for recording image forming devices such as copying machines and facsimiles. The present invention relates to a separating member in a recording medium feeding device that separates and feeds a recording medium.

[0002]

2. Description of the Related Art A recording medium loaded is separated and fed,
The following is a conventional recording device for recording by the recording means.

FIG. 15 is a schematic structural view of a carriage equipped with a recording head of a conventional recording apparatus as viewed from the main scanning axis direction.

Reference numeral 101 denotes an ink jet recording head having one or a plurality of nozzles for ejecting ink to perform recording on a recording medium, and 102 denotes the ink jet recording head 10.
1 is an ink tank for supplying ink, 103 is the ink jet recording head 101 and the ink tank 102.
Carriage for carrying out main scanning for printing
Reference numeral 04 is a head holding lever for holding the inkjet recording head 101 and the ink tank 102 on the carriage 103, 105 and 106 are guide shafts for main scanning of the carriage 103, and 107 is a recording medium in a sub-scanning direction. First transport roller for transport, 1
08 is a pinch roller that presses against the first transfer roller 107 to generate a transfer force, 109 is a pinch roller holder that holds the pinch roller 108, and 110 is press contact of the pinch roller 108 that acts on the pinch roller holder 109. A pinch roller spring that generates force, 118 is a paper feed roller,
Reference numeral 119 is a paper feed roller shaft, and 111 is a first conveyance roller 10.
7 is a second conveyance roller provided between the paper feed roller 118 and 112, and 112 is a roller shaft of the second conveyance roller 111.
Reference numeral 13 is a driven roller that presses against the second transport roller to generate a transport force, 114 is a spring that generates a pressure contact force of the driven roller 113, and 129 is paper that detects the edge of the recording medium transported in the sub-scanning direction. An end sensor, 120 is a paper feed cassette for stacking unrecorded recording media, 121 is a pressure contact roller that is held in the paper feed cassette and presses against the second transport roller 111 to generate a transport force, and 122 is a pressure contact roller 121. A pressure contact spring that acts to generate a pressure contact force, a pressure plate 124 that presses a stacked recording medium against a sheet feeding roller, and a pressure plate 124.
, 126 is a recording medium, 123 is a separation claw, 116 is a discharge roller for discharging the recording medium on which recording has been completed, and 115 is the first conveying roller 1.
07, a transfer roller 117 that contacts the outer peripheral surface of the paper discharge roller 116 and transmits the rotational force of the first conveyance roller 107 to the paper discharge roller 116, a driven roller 117 that is in pressure contact with the paper discharge roller 116, and a recording 127. A paper discharge stacker for stacking completed recording media, and a chassis 128 for mounting the guide shafts 105, 106 and the like.

8 and 9 show enlarged views around the separation claw 23. 8 is an enlarged view seen from the same direction as FIG. 15, and FIG. 9 is an enlarged view seen from the recording medium stacking direction.

The separation claw 123 has the tip 123b centered on the rotation support 123a within a certain range and the recording medium 12
It is supported so that it can rotate in the loading direction of 6,
The leading end 123b is arranged so as to act on the corner end on the downstream side in the transport direction of the stacked uppermost recording medium.
The recording medium 126 loaded on the pressure plate 124 by the action of the pressure plate spring 125 is locked by the separation claw tip 123b so as to be urged upward in the loading direction. This separation claw 12
The locking position of the recording medium by 3 is a position where the paper feeding roller 118 can act on the uppermost recording medium stacked.

10 to 13 show the state of separation of the recording medium by the separation claw 123.

When the paper feed roller 118 starts to rotate in the paper feed direction (FIGS. 10 and 11), the paper feed roller 118 acts on the uppermost recording medium of the recording media 126 loaded. At this time, the paper feed roller 118 pushes the recording medium downward from the locking position of the separation claw 123 in the recording medium stacking downward direction. By this operation and the action of the pressure plate spring 125, the urging force of the recording medium 126 to the sheet feeding roller 118 is obtained. At this time, separation claw 12
The leading edge 123b of No. 3 acts on the corner portion of the uppermost recording medium on the downstream side in the transport direction while following the movement of the uppermost recording medium.

When the uppermost recording medium is pressed and conveyed by the paper feed roller 118, the recording medium below the recording medium also moves in the conveying direction due to a slight frictional force between the papers. The tip 123b of 123 is shown in FIG.
As shown in FIG. 9, since a wall is formed in the transport direction, its movement is blocked. Only the top paper is the paper feed roller 11
Since the conveyance force of No. 8 is large, it is conveyed by passing through the wall of the separation claw 123 in the conveyance direction by bending (FIG. 11).
(FIG. 12).

As described above, the recording medium is separated by the separating claw.

Further, as another separating means, a separating claw is not used, but the leading end of the recording medium needs to climb in the vicinity of the leading end on the downstream side in the conveying direction of the loaded recording medium, as shown in FIG. There is a so-called bank separation method in which a bank 128 is provided and the paper is separated by using the force (so-called waist strength) that resists the bending of the paper.

[0012]

However, the conventional separation claw 123 described above has a drawback in that the characteristics of the usable paper are limited.

That is, since the recording medium 126 is bent and separated by the frictional force with the paper feed roller 118, a thick paper or the like is used.
If the paper is stiff, the force against the bending becomes very large, and the force exceeds the frictional force of the paper feed roller 118, and the paper feed roller 118 slips and the recording medium cannot be separated and conveyed. was there.

If the action of the separating claw 123 in the conveying direction is made small so that the separating claw shape corresponds to thick paper, not only the uppermost recording medium of ordinary paper but also the recording medium below it will be included. There was a drawback that it was transported to.

Further, in the bank separation system, since the separation is performed by relying on the force against the bending of the recording medium, the stop position at the time of separating the uppermost recording medium, that is, the feeding start position for the recording medium. There was a drawback that was greatly varied.

Further, since the strength of the paper is used for the separation, there is a drawback that the characteristics of the paper that can be used are limited similarly to the separation claw.

Further, there is a drawback that the size of the apparatus for feeding paper becomes large.

The present invention has been made to solve the above problems, and an object of the present invention is to reliably separate sheets regardless of the stiffness of the sheets and to keep the sheet feeding start position substantially constant. It is to provide a feeding device and a recording device.

[0019]

In order to achieve the above object, according to the present invention, a corner of a leading edge of a sheet stacked in a state of being pressed from the back side is supported to feed the sheet at the time of feeding the sheet. A separation member that performs separation is provided, and the separation member includes a first restricting portion that restricts movement of the corners of the leading ends of the stacked sheets in the stacking direction, and a corner of the stacked sheets to the downstream side in the feeding direction. A sheet feeding device including a second regulation portion that regulates movement, wherein an upstream end portion in the feeding direction of the first regulation portion and a front end portion in the stacking direction of the second regulation portion. Forms a gap through which the sheets can pass separately, and the upper end of the second restricting portion in the stacking direction is higher than the back surface of the downstream end of the first restricting portion in the feeding direction.

The upstream end of the second restricting portion in the stacking direction is preferably inclined to the downstream side in the feeding direction.

The first restriction portion is preferably made of a flexible member.

Further, it is preferable that the second restricting portion is made of a flexible member.

Further, it comprises the sheet feeding device, and a recording section for recording on the sheet fed by the sheet feeding device.

[0024]

In the present invention having the above construction, the stacked sheets are pressed from the back side, so that the uppermost sheet is the first sheet.
The sheet is fed in pressure contact with the back surface of the regulation portion, and the sheet is fed in this state.

When the feeding force acts on the uppermost sheet in the sheet feeding direction in the feeding direction, the leading end of the uppermost sheet in the feeding direction abuts against the upper end of the second regulating portion in the loading direction, and the sheet is fed by the same end. It resists going forward.

At this time, if the force (so-called waist) against the flexure of the sheet fed at this time is weak like ordinary paper, the sheet loses its resistance and the sheet is not accompanied by sheet feeding. The tip of the sheet starts to bend, and at the time when the first regulation portion cannot support the deflection, the leading edge of the sheet comes off from the first regulation portion, and the sheets are separated.

If the force (so-called waist) against the bending of the conveyed recording medium is strong, such as thick paper, the resistance force at the upper end in the stacking direction of the second restricting portion will not be weak, Does not bend.

Since the upper end of the second restricting portion in the stacking direction is higher than the back surface of the downstream end of the first restricting portion in the feeding direction, the sheets below the uppermost part are the second restricting portion. Only the uppermost sheet, which is clamped, is separated and fed through a gap formed between the first regulation portion and the second regulation portion.

When the upper end of the second restricting portion in the stacking direction is inclined toward the downstream side in the conveying direction, the uppermost sheet is aligned with the inclination of the second restricting portion when a strong sheet is fed. You will be guided to the gap smoothly.

When the first restricting portion is made of a flexible member, the restricting portion bends when the uppermost sheet presses the first restricting portion when a strong sheet is fed, The flexure smoothly guides the sheet into the gap.

Also, when the second restricting portion is made of a flexible member, the restricting portion is also acted when the uppermost sheet presses the second restricting portion when a strong sheet is fed. It bends and leans toward the downstream side in the transport direction, and is guided by the tilt to be smoothly guided to the gap.

[0032]

FIG. 7 is a schematic configuration view of a carriage equipped with a recording head of a recording apparatus according to an embodiment of the present invention as viewed from the main scanning axis direction.

1 is an ink jet recording head having one or a plurality of nozzles for ejecting ink to record on a recording medium, 2 is an ink tank for supplying ink to the ink jet recording head 1, and 3 is the ink jet recording head 1 And a carriage for carrying out main scanning for recording by mounting the ink tank 2, a head holding lever for holding the inkjet recording head 1 and the ink tank 2 on the carriage 3, and 5 and 6 for the carriage 3. Is a guide shaft for main scanning, 7 is a first transport roller for transporting the recording medium in the sub-scanning direction, 8 is a pinch roller that presses against the first transport roller 7 and generates a transport force, 9 Is a pinch roller holder for holding the pinch roller 8, and 10 is a pressure applied to the pinch roller 8 by acting on the pinch roller holder 9. Pinch roller spring for generating a force, 1
Reference numeral 8 is a paper feed roller, 19 is a paper feed roller shaft, 11 is a second carry roller provided between the first carry roller 7 and the paper feed roller 18, and 12 is a roller shaft of the second carry roller 11. ,
Reference numeral 13 is a driven roller that presses against the second transport roller to generate a transport force, 14 is a spring that generates a pressure contact force of the driven roller 13, and 29 is a paper sheet that detects the end of the recording medium transported in the sub-scanning direction. An edge sensor, 20 is a paper feed cassette for stacking unrecorded recording media, and 21 is held in the paper feed cassette,
A pressing roller that presses the second conveying roller 11 to generate a conveying force, 22 a pressing spring that acts on the pressing roller 21 to generate a pressing force, and 24 a pressure plate that presses a stacked recording medium against a sheet feeding roller. Reference numeral 25 is a pressure plate spring that acts on the pressure plate 24 to generate a pressure contact force, 26 is a recording medium as a sheet, 23 is a separation claw, 16 is a discharge roller for discharging the recording medium on which recording has been completed, and 15 is a first Transport roller 7 and paper discharge roller 1
6 is a transmission roller that is in contact with the outer peripheral surface of 6 and transmits the rotational force of the first transport roller 7 to the paper discharge roller 16, 17 is a driven roller that is in pressure contact with the paper discharge roller 16, and 27 is a stack of recording media on which recording has been completed. The paper output stacker, 28 is the guide shaft 5,
It is a chassis to which 6 is attached.

1 and 2 show a separating member 30 according to this embodiment.
Is shown. FIG. 1 is a view as seen from the cross-sectional direction of recording medium feeding, and FIG. 2 is a view as seen from the recording medium stacking direction.

The separating member 30 is supported so that its front end can rotate and move in the stacking direction of the recording medium 26 within a certain range around the rotation support portion 30a, and the topmost recording medium with the front end stacked. Is arranged so as to act on the corner end on the downstream side C in the feeding direction.

At the tip of the separating member 30, a surface (first restricting portion) 30b for restricting the movement of the recording medium in a direction (stacking direction) perpendicular to the conveying direction, and a feeding passage surface of the recording medium are provided. A surface that intersects at an angle of 90 ° or more (second restricting portion) 3
0c are formed.

The recording medium 26 loaded on the pressure plate 24 by the action of the pressure plate spring 25 is locked by the surface 30b of the separating member 30 so as to be urged upward from the back side in the loading direction. The locking position of the recording medium by the surface 30b of the separating member 30 is a position at which the paper feeding roller 18 can act on the uppermost recording medium.

The relationship between the tip of the separating member 30 and the loaded recording medium is shown in FIGS. A surface 3 that regulates the movement of the stacked recording media in the vertical direction with respect to the downstream end in the feeding direction.
The positional relationship between 0b and the downstream end 30e in the feeding direction is the surface 3
The downstream end 30e of the recording medium 0b in the feeding direction is provided on the upstream side in the feeding direction with a predetermined distance X from the leading end of the recording medium on the downstream side in the feeding direction.

An upper end 30f in the stacking direction of the surface 30c of the separating member 30 which intersects the feeding passage surface of the recording medium at an obtuse angle.
Intersects with the plane formed by the uppermost recording medium of the stacked recording media at a predetermined distance Y which is several times the thickness of the paper used in the stacking direction of the recording media. Further, the end portion 30f is provided so as to open in the feeding direction with a predetermined angle θ with respect to the stacking direction of the recording media (direction forming 90 ° with respect to the transport passage surface) (FIG. 3).

Then, as shown in FIG. 4, a surface 30b that restricts the movement of the recording medium in the direction perpendicular to the feeding direction and a surface 30c that intersects the feeding passage surface of the recording medium at an angle of 90 ° or more. Means that a gap 30d is formed by separating the recording medium so that the recording medium can pass through during feeding.

When a feeding force acts on the stacked uppermost recording medium by the sheet feeding roller 18 in the feeding direction, the leading end of the uppermost recording medium in the transport direction abuts the surface 30c of the separating member, and the surface 30c causes It resists going in the feeding direction.

If the force (so-called waist) against the bending of the recording medium fed is weak, such as ordinary paper,
The resistance of the recording medium is weakened by this resistance force, and the rotation of the feeding roller 18 causes the area after the leading edge of the recording medium to begin to bend, and the uppermost recording medium is separated by a movement similar to that of a conventional separating claw (Fig. 10 to 13 similar to the conventional example).

If the force (so-called waist) that resists the bending of the fed recording medium is strong, such as thick paper, the recording medium does not bend and the recording medium is rotated in accordance with the rotation of the feeding roller 18. Surface 3 whose tip is provided so as to open in the feeding direction
Since the height (distance) Y of the surface 30c from the plane formed by the recording medium is as small as several times the paper thickness, it is transported over the slope 0c. The recording mediums below the uppermost recording medium stop at the position of the surface 30c (FIG. 5).
~ Fig. 6).

If the surface 30c that intersects the feeding passage surface of the recording medium at an angle of 90 ° or more is formed of a flexible member, it will move in the feeding direction when it is pushed by using a strong paper. Needless to say, since the leading end of the recording medium easily climbs up the slope due to the bending, it is possible to separate and convey a good cardboard.

For the same reason, the surface 30b for restricting the movement of the recording medium in the direction perpendicular to the feeding direction may be formed of a flexible member.

As described above, if this separating member is used, various sheet types can be used without depending on the strength of the paper, and the sheet feeding device in which the feeding start position is substantially constant. Can be provided.

[0047]

As described above, according to the present invention,
The downstream end of the first restriction unit in the feeding direction and the upper end of the second restriction unit in the stacking direction are separated from each other to form a gap through which a sheet can pass, and the upper end of the second restriction unit in the stacking direction is formed. Is higher than the back surface of the downstream end of the first regulating portion in the feeding direction, various paper types can be used without depending on the strength of the sheet, and the feeding start position is almost the same. It is possible to provide a constant, highly reliable, and compact sheet feeding device.

[Brief description of drawings]

FIG. 1 is a sectional view of a sheet feeding device according to an embodiment of the present invention.

FIG. 2 is a plan view of a main part of the device.

FIG. 3 is an enlarged cross-sectional view of a main part of the same device.

FIG. 4 is an explanatory view of an enlarged action of a main part of the device.

FIG. 5 is a cross-sectional view of the main parts of the device.

FIG. 6 is an explanatory view of the operation of the device.

FIG. 7 is a schematic configuration diagram of a recording apparatus according to the embodiment.

FIG. 8 is a cross-sectional view of a conventional sheet feeding device.

FIG. 9 is a plan view of the device.

FIG. 10 is a cross-sectional view of the main parts of the same device.

FIG. 11 is an explanatory view of the operation of the device.

FIG. 12 is an explanatory view of the operation of the device.

FIG. 13 is an operation explanatory view of the same device.

FIG. 14 is an operation explanatory view of another conventional sheet feeding device.

FIG. 15 is a configuration diagram of a conventional recording device.

[Explanation of symbols]

 26 recording medium (sheet) 30 separating member 30b first restricting portion 30c second restricting portion 30d gap 30e downstream end of first restricting portion in feeding direction 30f upper end of stacking direction of second restricting portion

Claims (5)

[Claims] 1. A separation member for supporting a corner of a front end of a sheet stacked in a state of being pressed from the back side to separate the sheet at the time of feeding the sheet, and the separation member is provided for the stacked sheets. Sheet feeding including a first regulating portion that regulates movement of the corner of the leading edge in the stacking direction, and a second regulating portion that regulates movement of the corner of the stacked sheets to the downstream side in the feeding direction. In the device, the downstream end of the first restriction unit in the feeding direction and the upper end of the second restriction unit in the stacking direction are separated from each other to form a gap through which sheets can pass, and A sheet feeding device in which an upper end in the stacking direction of the restricting portion is higher than a back surface of a downstream end of the first restricting portion in the feeding direction. 2. The sheet feeding device according to claim 1, wherein an upstream end of the second restricting portion in the stacking direction is inclined downstream in the feeding direction. 3. The sheet feeding device according to claim 1, wherein the first restricting portion is made of a flexible member. 4. The sheet feeding device according to claim 1, wherein the second restricting portion is made of a flexible member. 5. A recording apparatus, comprising: the sheet feeding device according to claim 1; and a recording unit that records on a sheet fed by the sheet feeding device.