JPH1179439A - Sheet feeding device - Google Patents

Abstract

(57) [Problem] To provide a sheet feeding device capable of feeding even a sheet having a small width without increasing the number of parts and increasing the cost. SOLUTION: Two recording material suction means 2 are fed in a width direction orthogonal to a sheet feeding direction to two moving means 3 provided movably in a vertical direction above a sheet stacking means. By providing an interval capable of adsorbing the sheet having the minimum width among the sheets P, and holding the sheet P in a state in which the sheet P is inclined inward in the width direction at a predetermined angle θ, the adsorbed recording material P in the width direction is The ends are prevented from flexing significantly downwards.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding apparatus and an image forming apparatus having the same, and more particularly to a sheet feeding apparatus in which recording materials are sucked one by one by a recording material suction member and fed.

[0002]

2. Description of the Related Art Conventionally, in a copying machine, a printing machine, and other image forming apparatuses, as a feeding device for a recording material or a thin plate material,
Some include an air suction type sheet feeding device. As such a sheet feeding apparatus, for example, a recording material adsorbing means as disclosed in JP-A-5-058503, JP-A-5-289417, and JP-A-6-127718 is used. A suction pad, a moving means for supporting and moving the suction pad, and a suction force generating means for continuously generating a negative pressure in order to apply a suction force to the suction pad, wherein the suction pad having sucked the green material is provided. There is a configuration in which a recording material is fed by being moved by a moving unit.

[0003]

However, such a conventional sheet feeding apparatus has the following problems.

That is, Japanese Patent Application Laid-Open No. H05-058503 discloses that four suction pads (suckers) are used as recording material suction means evenly over substantially the entire width of a sheet to be used, from the vicinity of one end thereof. On the other hand, since it is provided near the end, the number of components is increased, and further, it is an obstacle to space saving and cost reduction.

In this structure, when a recording material smaller in size than the recording material described in the apparatus of the above-mentioned publication is conveyed, the suction pads located at both ends do not come into contact with the recording material. From there, a large amount of air easily flows into the suction pump, which is the suction force generating means, and when a single suction pump applies a negative pressure to all the suction pads, the necessary negative pressure is reduced. Difficult to get.

As a countermeasure, provision of a new shutoff means such as a valve in the air flow path from the suction pump to the suction pad, provision of a plurality of suction pumps, or provision of a considerably large capacity suction pump, etc. However, there is a problem that any of the measures increases the number of parts or increases the cost.

Japanese Unexamined Patent Publication No. 5-289417 discloses a device in which as many as five suction pads are used as recording material suction means, and the end portions from near one end to the other end of the sheet to be used almost uniformly over the entire width. It is provided in the vicinity, and its problems are the same as those described above.

On the other hand, Japanese Patent Application Laid-Open No. 6-127718 discloses that the number of suction pads is two, but the positions are near one end of substantially the entire width of a sheet to be used and the other end. When a recording material having a size smaller than the recording material depicted in the apparatus of the embodiment in this publication is to be conveyed, the suction pad does not come into contact with the recording material, and the recording material is suctioned. It is impossible to transport.

As a countermeasure, it is conceivable to provide a plurality of suction pads and a plurality of suction pumps, and to provide a moving means for moving the suction pad in a direction perpendicular to the recording material feeding direction. However, there is a problem that the countermeasures also increase the number of parts and increase the cost.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a sheet feeding apparatus capable of feeding a recording sheet (sheet) having a small width without increasing the number of parts and increasing the cost. The purpose is to provide.

[0011]

According to the present invention, there is provided a sheet feeding apparatus for sucking and feeding a sheet stacked on a sheet stacking means, having a concave portion on a bottom surface and generating a negative pressure in the concave portion. Two recording material suction means for sucking the sheet, and provided vertically movably above the sheet stacking means, respectively holding the two recording material suction means, and And two moving means for moving the suction means in the sheet suction direction, wherein the two recording material suction means adjust a minimum width of the fed sheets in a width direction orthogonal to the sheet feeding direction. The sheet is held by the two moving means in such a manner that an interval capable of adsorbing the sheet is provided and the sheet is inclined inward in the width direction at a predetermined angle.

Further, according to the present invention, the recording material suction means is formed of an elastic member, and is formed with a projection which is in contact with the moving means to maintain the recording material suction means at the predetermined angle of inclination. It is characterized by the following.

The present invention also provides a sheet feeding apparatus for sucking and feeding sheets stacked on sheet stacking means.
Two recording material attracting means having a concave portion on the bottom surface and generating a negative pressure in the concave portion to attract the sheet, and are provided movably in the vertical direction above the sheet stacking means; Two moving means for holding the material adsorbing means substantially vertically, and for moving the recording material adsorbing means in the sheet adsorbing direction at the time of sheet adsorbing;
The two recording material sucking means are held by the two moving means in a width direction orthogonal to the sheet feeding direction and with an interval capable of sucking a sheet having a minimum width among the fed sheets. On the other hand, the shape of the bottom surface is inclined inward in the width direction so that the angle formed between the sheet and the bottom surface in contact with the sheet is a predetermined angle.

Further, the present invention is characterized in that the recording material suction means is formed of an elastic member, and is formed with a projection which comes into contact with the moving means and maintains the recording material suction means in a substantially vertical state. Is what you do.

According to the present invention, there is provided a sheet feeding apparatus for sucking and feeding sheets stacked on a sheet stacking means.
Two recording material attracting means having a concave portion on the bottom surface and generating a negative pressure in the concave portion to attract the sheet, and are provided movably in the vertical direction above the sheet stacking means; And two moving means for holding the material adsorbing means and moving the recording material adsorbing means in the sheet adsorbing direction when the sheet is adsorbed, wherein the two recording material adsorbing means have a width orthogonal to the sheet feeding direction. In the direction
The sheet having the smallest width among the fed sheets is held by the two moving units at an interval capable of adsorbing the sheet having the smallest width. It is characterized by being inclined toward the inside in the width direction so as to be inclined inward in the width direction at an angle.

Further, as in the present invention, the two recording material suction means are attached to two moving means provided movably in the vertical direction above the sheet stacking means, in the width direction orthogonal to the sheet feeding direction. By providing an interval capable of adsorbing the sheet having the minimum width among the fed sheets, and holding the sheet inclined at a predetermined angle inward in the width direction, the width of the adsorbed recording material in the width direction is maintained. Are prevented from bending significantly downward.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic sectional view of a copying apparatus as an example of an image forming apparatus provided with a sheet feeding apparatus of the present invention. In FIG. 1, reference numeral 50 denotes a copying apparatus. The copying apparatus 50 includes a paper cassette 55 as sheet stacking means on which recording paper P as a sheet is stacked. The recording paper P stacked in the paper cassette 55 is supplied by the sheet feeding device 1A. After being fed to the pair of paper rollers 15 and 16, the process cartridge 52 passes through a pair of registration rollers 63 a and 63 b having a function of correcting the inclination of the recording paper P.
To be transported to

The recording paper P on which an image has been formed by the process cartridge 52 is further transported by a transport belt 73.
The image is fixed by being guided to a fixing device 75 via a pre-fixing guide 74, and thereafter discharged from a discharge port 78 downstream of the fixing device 75 and placed on a discharge tray 79.

Here, the process cartridge 52
Is constituted by a photosensitive drum 68, a developing sleeve 67, a cleaning blade 69 of the photosensitive drum, a toner (not shown), a stirring mechanism thereof, and a waste toner container. A transfer charger 70 is provided at a position facing the photosensitive drum 68.

On the other hand, the transport belt 73 has rollers 71, 7
2 and rotatably supported by rollers 72
Are driven by driving means (not shown). The transport belt 73 is given an appropriate tension by a tensioner (not shown) of the roller 72.

The fixing device 75 includes a heat roller 76 having a built-in heater and a pressure roller 77.
Thermal fixing of the toner printed on the recording paper P is performed in the nip portions 6, 77. The pressure roller 77 is pressed against the heat roller 76 by a spring (not shown).

In FIG. 1, reference numeral 80 denotes an original table glass on which an original is placed. Below the original table glass 80, an illumination lamp 81, an image forming lens 85, and mirrors 82 and 8 are provided.
An optical system including 3, 84, and 86 is provided, and the optical system irradiates a predetermined position of the photosensitive drum 68 with reflected light 87 from the document.

Reference numeral 91 denotes a pressure plate which is disposed on the original platen glass 80 so as to be openable and closable, and which presses an original appropriately.
Reference numeral 1 is provided with a pressure contact sheet 90 made of a sponge-like member having an appropriate hardness on the original contact surface side. Reference numeral 96 denotes a manual paper feed port. The manual paper feed port 96 is used when a recording material such as thick paper or thin paper which is difficult to feed from a cassette is used. The recording material from the manual paper feed port 96 is conveyed by rollers 97 and 98.

FIG. 2 shows the sheet feeding apparatus 1A.
FIG. 3 is a schematic perspective view of the sheet feeding apparatus.
It is -A sectional drawing.

In FIGS. 2 and 3, reference numeral 1 denotes a main frame of the sheet feeding device 1A, and the following members constituting the sheet feeding device 1A are fixed to the main frame 1.
Or it is engaged.

Reference numeral 2 denotes a pair of (two) suction pads serving as recording material suction means, and reference numeral 3 denotes one end of the suction pad 2 which is rotatably held within a predetermined range. Is a swing arm which is a moving means for moving in a suction direction.

The suction pad 2 is formed of an elastic member such as rubber, and has a concave portion 2a having a substantially conical shape on the bottom surface. When the recording paper is fed, a negative pressure is generated in the concave portion, so that both ends of the recording paper P cut in a predetermined size in the feeding direction can be sucked.

By the way, the pair of suction pads 2, 2
Is held in the swing arm 3 in the width direction orthogonal to the recording paper feeding direction and at an interval that does not hinder the suction of the minimum width recording paper among the recording papers that can be used by the copying machine 50. By providing the suction pads 2 and 2 at such positions, it is possible to stably convey a recording sheet having a minimum width without increasing the number of parts and increasing the cost.

By the way, when the suction pads 2 and 2 are provided at such positions, when the recording paper wider than the minimum width recording paper, for example, the recording paper P as shown in FIG. The suction pads 2 and 2 suck the vicinity of the center of the recording paper P. Here, when the vicinity of the center of the recording paper P is sucked in this way, both side edges in the width direction of the recording paper P are largely bent downward, and a conveying roller pair 1 described later is used.
There is a possibility that the delivery of the recording paper to the recording papers 5 and 16 may be hindered and stable conveyance may not be performed.

Therefore, in the present embodiment, as shown in FIG. 4, a protrusion 2b is provided at the upper end of the suction pad 2, and this protrusion 2b is brought into contact with the bottom surface of the swing arm 3 so that the suction pads 2, 2 Is tilted inward by a predetermined angle θ in a direction orthogonal to the transport direction. When the recording paper P is sucked by inclining the suction pads 2 and 2 in this manner, a force is applied to the recording paper P in a direction in which both side edges are pulled up, and the force is applied to the lower side of the recording paper both side edges. The recording paper is reliably delivered to the transport roller pairs 15 and 16 and stable transport is possible.

On the other hand, the swing arm 3 is rotatably supported by the movable table 5 via the pin 3a, and holds the suction pad 2 by the tension coil spring 7 attached between the movable table 5 and the movable table 5. It is urged in a direction to pull up an end 3b on the other side (hereinafter referred to as the other end), that is, in a direction to press the suction pad 2 against the recording paper.

The moving table 5 has a part of the bracket 5.
By engaging the groove portion 5a 'of "a" with a not-shown notch of the main frame 1, it is slidably held by the main frame 1 and recorded by a tension coil spring 6 having one end fixed to the main frame 1. The paper P is urged in the feeding direction.

Reference numeral 4 denotes a recording paper retainer. The recording paper retainer 4 is rotatably supported by the rotating arm 3 via a pin 4a, and is urged downward by a compression spring 40 in the drawing.
Further, it is stopped at a predetermined position by a stopper 4b.

A drive shaft 8 is connected to a motor (not shown). The drive shaft 8 rotates the first cam 9, the second cam 10, and the third cam 13. The first cam 9 comes into contact with the other end 3b of the swing arm 3 from above to move the swing arm 3 up and down. Further, the second cam 10 comes into contact with the contact portion 5b formed at the end (hereinafter referred to as the other end) of the movable base 5 opposite to the side on which the tension coil spring 6 is attached, from the inside,
This is for moving the movable table 5 in parallel with the tension coil spring 6.

The third cam 13 is for driving the suction pump 11 by rotating a link 12 for driving the suction pump 11 which is a suction force generating means around a rotation shaft 12a. . Here, this suction pump 11
Has the ability to secure a negative pressure to obtain a predetermined suction force even when using plain paper with relatively high air permeability or recording paper generally used in copiers by obtaining a predetermined drive. And is fixed to the main frame 1 by the bracket 11a.

The suction pump 11 is configured to generate a predetermined negative pressure during the upward operation of a vertically movable partition (not shown) provided inside the suction pump 11. 14 and 14a, the concave portion 2 of the suction pad 2
a can be reached. And
Due to this negative pressure, the suction pad 2 has a suction force capable of suctioning a predetermined number of recording sheets.

The link 12 has two substantially L-shaped arms 121 and 122 and is rotatably attached to the main body of the sheet feeding apparatus. Note that one arm 121 of the link 12 is urged by an urging means (not shown) to press against the third cam 13, and the other arm 122 moves the movable portion 11 b of the suction pump 11 so as to drive the suction pump 11. Is engaged with the upper end.

On the other hand, reference numerals 15 and 16 denote paper feed roller pairs.
The paper feed roller pairs 15 and 16 are urged by urging means (not shown) in a direction approaching each other, and are driven by a motor (not shown) to convey the recording paper P. In order to constitute a paper separating means, the pair of paper feed rollers 15, 16 rotate one roller 16 in a direction opposite to the sheet feeding direction to convey only one sheet of recording paper P into the copying apparatus. You may make it.

In the above configuration, FIGS. 3, 5 to 7
The operation of the present embodiment will be described with reference to FIG. In addition,
FIGS. 3, 5 to 7 show a state in which the number of recording sheets loaded on the paper cassette 55 is large and the position of the uppermost recording sheet is high.

FIG. 3 shows a standby state before paper feeding. In this state, the largest portion of the first cam 9 is in contact with the other end 3b of the swing arm 3 from above, whereby the swing arm 3 keeps a substantially horizontal state, and the suction pad 2 It is separated from the recording paper P. In addition, the second cam 10 has the largest radius portion in contact with the contact portion 5b of the movable base 5, whereby the movable base 5 is stopped at the left end position of its movable range.

Further, the recording paper retainer 4 includes a compression spring 40.
, And is stopped at a predetermined position by the stopper 4b, and is separated from the recording paper P. Further, the third cam 13 is in contact with the first arm 121 of the link 12 in a state before the movable portion 11b of the suction pump 11 is pulled up, so that the suction pump 11 does not generate a negative pressure. It is in a state.

FIG. 5 shows a state in which the suction pad 2 attempts to suck the recording paper P. In this state, the first cam 9, the second cam 10, and the third cam 13 are moved from the state shown in FIG. 8 and starts to rotate in the direction of arrow R. Here, the first cam 9 is separated from the other end 3b of the swing arm 3 by the rotation of the first cam 9 by this rotation. The suction pad 2 swings downward due to the force, so that the suction pad 2 comes into pressure contact with the recording paper P.

When the number of sheets of recording paper loaded in the paper cassette 55 is reduced, the first cam 9 has its minimum radius abutting on the other end 3b of the swing arm 3 and swings accordingly. The suction pad 2 side of the arm 3 swings further downward than in the case of FIG.

The recording paper presser 4 is urged downward by the compression spring 40 to abut the recording paper P and press the recording paper P. At this time, the second cam 10 has the largest radius portion still in contact with the contact portion 2b of the movable base 5, whereby the movable base 5 stops at the left end position of its movable range. I have.

On the other hand, the third cam 13 has its maximum radius gradually contacting the link 12, and the movable portion 11 b of the suction pump 11 is being pulled upward through the link 12. As a result, the suction pump 11 generates a negative pressure, and air flows in due to the air permeability of the recording paper P. However, the negative pressure value in the suction pump 11 reaches a value sufficient to adsorb the recording paper P. Then, the suction of the recording paper P is started at a predetermined negative pressure value.

FIG. 6 shows a state in which only the uppermost recording paper P 'among the attracted recording papers P is separated. In this state,
The first cam 9 has an intermediate radius portion between the maximum radius and the minimum radius of the first cam 9 abuts on the other end 3b of the swing arm 3, whereby the swing arm 3 is slightly shifted from the state shown in FIG. With this, the suction pad 2 moves upward, and the uppermost recording sheet P ′ is pulled upward. The recording paper presser 4 is urged downward in the figure by a compression spring 40, contacts the uppermost recording paper P ', and presses the recording paper P'.

Here, the second sheet from the top has a weaker attraction force than the uppermost recording sheet P ', and is thus held down by the separation claw 20 and the recording sheet holder 4 to the weaker attraction force. During this time, the rigidity of the recording paper overcomes, and there is also a frictional force due to the pressing force from the recording paper retainer 4, so that the second and subsequent sheets are separated from the uppermost recording paper P '.

On the other hand, the second cam 10 has the largest part of its radius in contact with the moving table 5 and stops at the left end position of its movable range. The third cam 13 is still in contact with the link 12 at its maximum radius. This allows
The suction pump 11 continues to generate a negative pressure, and as a result, the suction pad 2 suctions the recording paper P ′.

FIG. 7 shows a state in which the sucked recording paper P ′ is sent out toward the pair of paper feed rollers 15 and 16.

In this state, the largest portion of the radius of the first cam 9 abuts on the other end 3b of the swing arm 3, whereby the swing arm 3 returns to a substantially horizontal state. Further, since the second cam 10 has a minimum portion of the radius abutting on the moving table 5, the moving table 5 moves in the arrow X direction by the spring force of the extension coil spring 6.

At this time, as shown in FIG. 8, the suction pad 2 overcomes the influence of the weight of the recording paper P 'by the elastic force of the projection 2a, maintains the predetermined angle θ, and as a result, the recording paper P'
The sagging amount y due to the influence of the gravity at both ends of the substrate can be kept small. As a result, the recording paper P ′ is kept close to a horizontal state as a whole in the width direction.
Transfer to 5 and 16 can be performed without any trouble.

As shown in FIG. 9, when the predetermined angle θ is previously set to be larger than that in FIG. 8, the sag amount y becomes larger, but even in this case, as in the case of FIG. Is maintained close to a horizontal state as a whole in the width direction, so that the transfer to the roller pairs 15 and 16 can be performed without any trouble.

By the way, the recording paper P 'is moved to the roller pair 15, 1
6, the recording paper presser 4 is stopped at a predetermined position similar to the position shown in FIG.
Although there is slight contact with the recording paper, the pressing force is not applied, and the frictional force is extremely small, so that there is no trouble in the conveyance of the recording paper.

The contact position of the third cam 13 with the link 12 is at a position where the movable portion 11b of the suction pump 11 is returning to the state before the movable portion 11b is pulled upward, and the air permeability of the recording paper P Therefore, there is air guided into the pump by the suction operation, and the air is being discharged.
Indicates a state in which no negative pressure is generated, and the feed roller pair 1
The unnecessary suction force of the suction pad 2 after the transfer to the suction pads 5 and 16 is not generated.

After that, the recording paper P 'delivered to the pair of paper feed rollers 15, 16 is applied to the paper guide plate 6 shown in FIG.
Registration roller pair 63a, 63 while being guided by 5, 66
By b, it is transported to the process cartridge 52.
On the other hand, the image information of the original (not shown) is illuminated by an illumination lamp 81 below the original platen glass 80, reflected by an imaging lens 85 and mirrors 82, 83, 84, and 86, and becomes reflected light 87. Irradiation is performed at 68 predetermined positions.

The image formed on the photosensitive drum 68 is developed by the developing sleeve 67, and is transferred to the conveyed recording paper P 'by the transfer charger 70.
Further, the recording paper P ′ is further transferred to the fixing device 75 by the transport belt 73.
Sent to Then, the toner printed on the recording paper P ′ is thermally fixed by the heat roller 76, and thereafter,
The sheet is placed on the discharge tray 79 via the discharge port 78, and the recording is completed.

In the above description, a case has been described in which the suction pad 2 is tilted to prevent both ends in the width direction of the recording paper P from bending downward. Instead of inclining the suction pad 2 without limitation, for example, as shown in FIG.
The shape of the bottom surface 2d may be inclined inward in the width direction so that the angle formed between the bottom surface 2d contacting the recording paper P and the recording paper P is a predetermined angle θ.

In this case, it is necessary to hold the suction pad 2 'substantially perpendicular to the recording paper P. For this reason, for example, as shown in FIG. And the projections 2c are brought into contact with the bottom surface of the swing arm 3 to elastically hold the suction pad 2 '.

Also, the suction pad 2 is held vertically without, for example, setting the angle of the suction pad 2 ′ itself or the angle between the suction pad 2 and the swing arm 3 instead of inclining the suction pad 2. The swinging arm itself may be inclined so that the suction pad 2 is inclined inward in the width direction at a predetermined angle θ.

In the above description, the case where the recording paper P is suctioned by one suction pump 11 has been described. However, this suction pump 11 may be connected to each suction pad 2.

[0062]

As described above, according to the present invention, 2
By setting the interval between the two recording material suction means to be an interval at which the sheet having the minimum width among the fed sheets can be sucked, the sheet having the minimum width can be stably fed. . Further, by inclining the two recording material suction means at a predetermined angle, it is possible to prevent a marked downward bending of both ends in the width direction of the suctioned recording material. Thus, a sheet feeding apparatus capable of feeding a sheet having a small width without increasing the number of parts and increasing the cost is provided.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a copying apparatus as an example of an image forming apparatus provided with a sheet feeding device of the present invention.

FIG. 2 is a schematic perspective view of the sheet feeding device.

FIG. 3 is a sectional view of the sheet feeding device taken along line AA.

FIG. 4 is a diagram illustrating a configuration of a suction pad of the sheet feeding device.

FIG. 5 is a diagram showing a state when the sheet feeding device starts a recording paper suction operation.

FIG. 6 is a diagram showing a state in which only the uppermost recording paper is separated from the recording paper sucked by the recording paper suction operation.

FIG. 7 is a diagram showing a state in which the sucked recording paper is sent out to a pair of paper feed rollers.

FIG. 8 is a view for explaining the state of the uppermost recording sheet sucked by the suction pad.

FIG. 9 is a view for explaining a state of the uppermost recording sheet sucked by a suction pad inclined more deeply than the inclination shown in FIG. 8;

FIG. 10 is a diagram illustrating a configuration of a suction pad of a sheet feeding device according to a second embodiment of the present invention.

[Explanation of symbols]

 1A Sheet feeding device 2, 2 'Suction pad 2a Recess 2b, 2c Recess projection 2d Bottom surface 3 Swing arm 11 Suction pump 50 Copier 55 Paper cassette P, P' Recording paper

Claims (5)

[Claims] 1. A sheet feeding apparatus for sucking and feeding sheets stacked on a sheet stacking means, comprising: a two-recording device having a concave portion on a bottom surface and generating a negative pressure in the concave portion to suction the sheet. A material adsorbing means; and a vertically movable member provided above the sheet stacking means, respectively holding the two recording material adsorbing means, and moving the recording material adsorbing means in the sheet adsorbing direction when the sheet is adsorbed. Two moving means for moving the recording medium, wherein the two recording material suction means are arranged in a width direction orthogonal to the sheet feeding direction, and are capable of sucking a sheet having a minimum width among the fed sheets. And a sheet feeding device which is held by the two moving means in a state of being inclined inward in the width direction at a predetermined angle. 2. The recording material adsorbing means is formed of an elastic member, and is formed with a projection which is in contact with the moving means to keep the recording material adsorbing means in the inclined state at the predetermined angle. The sheet feeding device according to claim 1, wherein 3. A sheet feeding apparatus for sucking and feeding a sheet stacked on a sheet stacking means, wherein two recordings having a concave portion on a bottom surface and generating a negative pressure in the concave portion to suck the sheet. A sheet adsorbing means, and a vertically movable member provided above the sheet stacking means, and each of the two recording material adsorbing means is held substantially vertically, and the sheet adsorbing means is used for sheet adsorbing during sheet adsorbing. And two moving means for moving the recording material in the width direction orthogonal to the sheet feeding direction, and for sucking a sheet having a minimum width among the fed sheets. The shape of the bottom surface is inclined inward in the width direction so that the angle formed between the bottom surface in contact with the sheet and the sheet becomes a predetermined angle while being held by the two moving means with a possible interval. Shape and a sheet feeding apparatus, characterized in that the. 4. The recording material adsorbing means is formed of an elastic member, and has a projection which is in contact with the moving means and maintains the recording material adsorbing means in a substantially vertical state. 3. The sheet feeding device according to 3. 5. A sheet feeding apparatus for sucking and feeding a sheet stacked on a sheet stacking means, wherein two recordings having a concave portion on a bottom surface and generating a negative pressure in the concave portion to suck the sheet. A material adsorbing means; and a vertically movable member provided above the sheet stacking means, respectively holding the two recording material adsorbing means, and moving the recording material adsorbing means in the sheet adsorbing direction when the sheet is adsorbed. The two recording material suction means are capable of suctioning a sheet having a minimum width among the fed sheets in a width direction orthogonal to a sheet feeding direction. While being held by the two moving means at an interval, the moving means is inclined inward in the width direction such that the two recording material suction means are inclined inward in the width direction respectively at a predetermined angle. Sheet feeding apparatus characterized by there.