JP7372080B2 - sheet feeding device - Google Patents

Description

The present invention relates to a sheet feeding device that feeds sheets.

A sheet feeding device that feeds sheets by floating stacked sheets of paper, and sucking and transporting the highest (top) sheet of the floating sheets using a suction conveyance means to feed the paper to a paper feed destination. The device is known.

In such a paper feeding device, in order to feed the stacked sheets one by one, it is necessary to separate the top sheet that is suction-conveyed by the suction-conveying means from the second and subsequent sheets from the top. .

On the other hand, a paper feeding device is known that includes a rectifying member for separating the uppermost sheet from the second or lower sheets from the top (see Patent Document 1).

The above-mentioned rectifying member is formed to extend above the edge of the paper from the upper edge of the air outlet that blows air from the side of the paper above the topmost paper among the stacked papers. .

When air is blown out from the air outlet, a negative pressure is generated between the uppermost sheet of paper and the rectifying member, so that the uppermost sheet of paper is attracted to the rectifying member. When the top sheet of paper is sucked into the rectifying member, air flows from the air outlet between the top sheet of paper and the second sheet from the top, causing the air to flow between the top sheet of paper and the second sheet from the top. The paper is separated.

JP2019-81641A

However, in the paper feeding device including the above-mentioned rectifying member, the uppermost sheet of paper attracted to the rectifying member may peel off from the rectifying member. This phenomenon tends to occur when feeding paper with weak stiffness.

When the uppermost sheet of paper is peeled off from the rectifying member, the uppermost sheet of paper may prevent air from flowing from the air outlet into the space between the uppermost sheet of paper and the second sheet from the top. As a result, it may not be possible to separate the uppermost sheet from the second or lower sheets from the top. As a result, paper feeding problems such as double feeding may occur.

The present invention has been made in view of the above, and it is an object of the present invention to provide a sheet feeding device that can reduce separation defects between the uppermost sheet and the second or lower sheets from the top among stacked sheets. .

In order to achieve the above object, the sheet feeding device of the present invention includes an air outlet that blows air from the side of the sheet above the uppermost sheet of the stacked sheets, and an end of the sheet from above the air outlet. a rectifying member that extends above the flow regulating member; and a pressing member that is disposed ahead of the tip of the flow regulating member in the extending direction and presses the upper surface of the uppermost sheet floating from the stacked sheets. shall be.

According to the sheet feeding device of the present invention, it is possible to reduce separation defects between the uppermost sheet and the second or lower sheets from the top among the stacked sheets.

FIG. 1 is a schematic configuration diagram of a paper feeding device according to an embodiment. 2 is a control block diagram of the paper feeding device shown in FIG. 1. FIG. 2 is a partially enlarged plan view of the paper feeding device shown in FIG. 1. FIG. FIG. 2 is an enlarged view of the vicinity of the main floating air outlet of the paper feeding device shown in FIG. 1. FIG. FIG. 2 is a partially enlarged view of a side fence of the paper feeding device shown in FIG. 1. FIG. FIG. 6 is a diagram illustrating how a pressing member presses a sheet of paper. FIG. 6 is an explanatory diagram showing a state where paper has been peeled off from the rectifying member.

Embodiments of the present invention will be described below with reference to the drawings. The same or equivalent parts and components are designated by the same or equivalent symbols throughout the drawings.

The embodiments shown below exemplify devices etc. for embodying the technical idea of this invention, and the technical idea of this invention includes the material, shape, structure, arrangement etc. of each component. shall not be specified as: The technical idea of this invention can be modified in various ways within the scope of the claims.

FIG. 1 is a schematic configuration diagram of a paper feeding device according to an embodiment of the present invention. FIG. 2 is a control block diagram of the paper feeding device shown in FIG. 1. 3 is a partially enlarged plan view of the paper feeding device shown in FIG. 1. FIG. FIG. 4 is an enlarged view of the vicinity of the main floating air outlet of the paper feeding device shown in FIG. FIG. 5 is a partially enlarged view of the side fence of the paper feeding device shown in FIG. In the following description, the direction perpendicular to the paper surface of FIG. 1 will be referred to as the front-rear direction, and the front direction of the paper surface will be referred to as the front direction. Moreover, the top, bottom, left and right of the paper surface in FIG. 1 are defined as the top, bottom, left and right directions.

As shown in FIGS. 1 to 4, a paper feeding device (corresponding to a sheet feeding device) 1 according to the present embodiment includes a paper feeding table 2, a lifting motor 3, a paper feeding guide plate 4, and a sabaki gate 5. , two side fences 6 , two pressing members 7 , an end fence 8 , a floating section 9 , a separation section 10 , a conveyance section 11 , an upper limit sensor 12 , and a control section 13 .

The paper feeding device 1 is a device that feeds paper (equivalent to a sheet) P to a printing section (not shown) of a printing device. The direction from left to right in FIG. 1 is the direction in which the paper P is transported by the transport unit 11 during the paper feeding operation. Upstream and downstream in the following description refer to upstream and downstream in the direction in which the paper P is conveyed by the conveying section 11.

The paper feed tray 2 is used to stack paper P used for printing. The paper feed tray 2 is configured to be movable up and down.

As shown in FIG. 3, the paper feed tray 2 is formed with a fence insertion hole 2a into which a side fence 6 to which a side floating mechanism section 22 and a side separation mechanism section 42, which will be described later, are attached is inserted. Two fence insertion holes 2a are formed corresponding to the two side fences 6, respectively. One fence insertion hole 2a is formed at the front end of the paper feed tray 2, and the other fence insertion hole 2a is formed at the rear end of the paper feed tray 2.

The elevating motor 3 raises and lowers the paper feed tray 2.

The paper feed guide plate 4 is a member that regulates the position of the downstream end (right end) of the paper P on the paper feed table 2 . The paper feed guide plate 4 is disposed near the downstream side of the paper feed table 2 and below the downstream end of a belt unit 51, which will be described later.

As shown in FIGS. 3 and 4, the paper feed guide plate 4 has a notch 4a in the center in the front-rear direction for blowing air from the main flotation mechanism section 21 (to be described later) onto the paper P on the paper feed table 2. It is formed by cutting out the top of the section.

The sabaki gate 5 is a member that dams up sheets P other than the uppermost sheet P attracted to the transport section 11 among the sheets P floated by the floating section 9 . Two Sabaki gates 5 are installed in the lower vicinity of the downstream end of the conveyance section 11 and spaced apart from each other in the front-rear direction.

The side fence 6 is a member that regulates the position of the paper P on the paper feed table 2 in the front-rear direction (width direction). The two side fences 6 are spaced apart from each other in the front-rear direction. The side fence 6 is inserted into the fence insertion hole 2a of the paper feed table 2, and is configured to be movable in the front-back direction within the range of the fence insertion hole 2a.

As shown in FIGS. 3 to 5, the side fence 6 is formed with a side floating air outlet 16 and a side separation air outlet (corresponding to an outlet) 17. Further, the side fence 6 is provided with a flow regulating member 18. Note that FIG. 5 is a diagram of the rear side fence 6 viewed from the front side.

The side floating air outlet 16 is an outlet for a side floating air flow generated by a side floating mechanism section 22, which will be described later. The side separation air outlet 17 is an outlet for a side separation airflow generated by a side separation mechanism section 42, which will be described later. That is, the side separation air outlet 17 is an outlet that blows air from the front and rear sides of the paper P above the uppermost paper P among the paper sheets P stacked on the paper feed table 2. .

The rectifying member 18 pulls the uppermost sheet P of the sheets P floated by the floating unit 9 on the sheet feed table 2, and creates a space between the uppermost sheet P and the second sheet P from the top. This is a member that allows the side separation airflow to flow. The rectifying member 18 extends from above the side separation air outlet 17 to above the end of the paper P on the paper feed table 2 in the front-rear direction. The rectifying member 18 is inclined so as to become higher toward the center of the paper feed tray 2 in the front-rear direction.

In the present embodiment, the flow regulating member 18 is attached along the upper edge of the side separation air outlet 17 on the inside surface of the side fence 6 (on the paper feed table 2 side). However, due to the side separation airflow blown out from the side separation air outlet 17, the topmost paper P is attracted to the rectification member 18 and is sucked by the rectification member 18, and the topmost paper P and the second paper P from the top are separated. The rectifying member 18 may be arranged above and away from the upper edge of the side separating air outlet 17 as long as it is possible to allow the side separating airflow to flow between them. The distance between the rectifying member 18 and the side separation air outlet 17 in this case can be determined experimentally.

The pressing member 7 is for pressing the upper surface of the uppermost sheet P floating from the sheets P stacked on the sheet feeding tray 2. The two holding members 7 are arranged in parallel between the two flow regulating members 18 with the conveying section 11 in between in the front-rear direction. That is, the holding member 7 is arranged ahead of the tip of the rectifying member 18 in the extending direction.

The pressing member 7 is arranged near a conveying surface 56b of the conveying section 11, which will be described later, in the front-rear direction. Specifically, the pressing member 7 is arranged in a position in the front-rear direction such that the conveyance resistance does not become so large that the paper P swells between it and the conveyance surface 56b and prevents the conveyance unit 11 from conveying the paper P. has been done.

The pressing member 7 is arranged above the paper feed guide plate 4 in the left-right direction. The left end of the holding member 7 is arranged above the right end of the paper P on the paper feed tray 2.

Further, the pressing surface 7a, which is the lower surface of the pressing member 7 that presses the paper P, is arranged at the same height as the conveying surface (corresponding to the suction surface) 56b of the conveying section 11 or at a position higher than the conveying surface 56b.

The end fence 8 is a member that regulates the position of the upstream end (left end) of the paper P on the paper feed table 2 . The end fence 8 is arranged above the paper feed tray 2. The end fence 8 is configured to be movable in the left and right direction.

The floating unit 9 blows air onto the paper P on the paper feed tray 2 to float the paper P. The floating section 9 includes a main floating mechanism section 21 and two side floating mechanism sections 22.

The main floating mechanism section 21 blows air to float the paper P on the paper feed table 2 from the downstream side. The main floating mechanism section 21 is arranged near the downstream side of the paper feed tray 2. The main flotation mechanism section 21 includes a main flotation fan 26, a shutter 27, and two main flotation air outlets 28.

The main floating fan 26 blows air onto the paper P on the paper feed table 2 from the downstream side to generate a main floating airflow for floating the paper P.

The shutter 27 switches on and off the main floating air flow from the main floating air outlet 28 . While the main flotation fan 26 is being driven, when the shutter 27 is open, the main flotation airflow is blown out from the main flotation air outlet 28, and when the shutter 27 is closed, the main flotation airflow is blown out from the main flotation air outlet 28. The blowing of the main floating airflow is stopped.

The main floating air outlet 28 is an outlet for a main floating air flow generated by driving the main floating fan 26 . The two main floating air outlets 28 are arranged in the lower vicinity of the downstream end of the conveying section 11 and spaced apart from each other in the front-rear direction.

The two side floating mechanisms 22 are arranged so as to be spaced apart from each other in the front-rear direction with the paper feed table 2 in between. The two side floating mechanisms 22 are installed one each on the outside of the two side fences 6.

The front side floating mechanism section 22 blows air to float the paper P on the paper feed tray 2 from the front side. The rear side floating mechanism section 22 blows air to float the paper P on the paper feed tray 2 from the rear side. The side levitation mechanism section 22 includes a side levitation fan 31 and a shutter 32.

The side floating fan 31 blows air onto the paper P on the paper feed table 2 from the side floating air outlet 16 of the side fence 6 to generate a side floating airflow for floating the paper P.

The shutter 32 switches on/off the blowing of the side floating airflow from the side floating air outlet 16. While the side floating fan 31 is being driven, when the shutter 32 is open, side floating air flows out from the side floating air outlet 16, and when the shutter 32 is closed, the side floating airflow blows out from the side floating air outlet 16. Blowout of the side floating airflow is stopped.

The separating section 10 separates the uppermost sheet P of the sheets P floated by the floating section 9 from the second and subsequent sheets P from the top. The separation section 10 includes a main separation mechanism section 41 and two side separation mechanism sections 42 .

The main separation mechanism section 41 flows air from the downstream side between the uppermost sheet P floated by the floating section 9 and adsorbed to the transport section 11 and the second sheet P from the top. The main separation mechanism section 41 includes a main separation fan 46 and two main separation air outlets 47 .

The main separation fan 46 blows air from the downstream side between the top paper P and the second paper P from the top that have been attracted to the transport unit 11, and separates the top paper P and the second and subsequent sheets from the top. A main separation airflow for separating the paper P is generated.

The main separation air outlet 47 is an outlet for the main floating air flow generated by driving the main separation fan 46. The two main separation air outlets 47 are arranged in the lower vicinity of the downstream end of the conveying section 11 and spaced apart from each other in the front-rear direction. The main separation air outlet 47 blows air upward toward the conveying section 11 .

The two side separation mechanisms 42 are arranged so as to be spaced apart from each other in the front-rear direction with the paper feed table 2 in between. The two side separation mechanisms 42 are installed one each on the outside of the two side fences 6. The side separation mechanism section 42 is arranged adjacent to the right side of the side floating mechanism section 22.

The side separation mechanism section 42 pulls the uppermost sheet P of the sheets P floated by the floating section 9 toward the rectifying member 18, and separates the uppermost sheet P from the second sheet P from the top. A side separation airflow for this purpose is blown out from a side separation air outlet 17 of the side fence 6. The side separation mechanism section 42 includes a side separation fan 48 that generates side separation airflow.

The conveyance section 11 attracts and conveys the uppermost sheet P of the sheets P floated by the floating section 9 by air suction. The conveyance section 11 includes two belt units 51, a conveyance motor 52, a chamber 53, and a suction fan 54.

The belt unit 51 attracts and holds the paper P and transports it. The two belt units 51 are arranged in parallel in the front-rear direction. The belt unit 51 is disposed straddling the right end of the paper feed tray 2 in the left-right direction. The belt unit 51 includes a conveyor belt 56, a drive roller 57, and a driven roller 58.

The conveyance belt 56 is an annular belt that is stretched around a drive roller 57 and a driven roller 58. A plurality of belt holes 56a are formed in the conveyor belt 56 over the entire circumference. The conveyance belt 56 attracts and holds the paper P on the conveyance surface 56b, which is the lower surface of the conveyance belt 56, by the suction force generated in the belt hole 56a by the drive of the suction fan 54. The paper P is transported by the drive roller 57 driving the transport belt 56 to rotate (endless movement) while holding the paper P by suction.

The drive roller 57 rotates (endlessly moves) the conveyor belt 56. The drive rollers 57 of the two belt units 51 are connected to each other by a shaft 59.

The driven roller 58 supports the conveyor belt 56 together with the drive roller 57 . The driven roller 58 rotates as a result of the rotating conveyor belt 56 . The driven rollers 58 of the two belt units 51 are connected to each other by a shaft 60.

The conveyance motor 52 rotates the drive roller 57 by rotating the shaft 59 .

The chamber 53 forms a negative pressure chamber for generating suction force in the belt hole 56a of the belt unit 51. The chamber 53 holds the belt unit 51 therein so that the conveying surface 56b of the conveying belt 56 is exposed. A ventilation hole (not shown) is formed in a portion of the bottom plate of the chamber 53 through which the conveyor belt 56 passes. By suctioning air into the chamber 53 through the belt hole 56a of the conveyance surface 56b of the conveyor belt 56 and the ventilation hole of the chamber 53, a suction force is generated in the belt hole 56a.

A suction fan 54 exhausts air from the chamber 53. When the suction fan 54 exhausts air from the chamber 53, air is sucked into the chamber 53 from outside the chamber 53 through the belt hole 56a of the conveyance surface 56b of the conveyance belt 56 and the ventilation hole of the chamber 53. The suction fan 54 is arranged above the chamber 53.

The upper limit sensor 12 is for detecting whether or not the uppermost sheet P of the sheets P stacked on the sheet feed tray 2 is at a predetermined sheet upper limit position. The upper limit sensor 12 is a reflective optical sensor.

The control unit 13 controls the entire operation of the paper feeding device 1 . The control unit 13 includes a CPU, RAM, ROM, hard disk, and the like.

Next, the operation of the paper feeding device 1 will be explained.

When instructed to start feeding, the control unit 13 starts driving the main floating fan 26, the two side floating fans 31, the main separation fan 46, the two side separation fans 48, and the suction fan 54. Both the shutter 27 and the two shutters 32 are in an open state.

As a result, a main floating airflow is blown out from the main floating air outlet 28, a side floating airflow is blown out from the side floating air outlet 16, a main separation airflow is blown out from the main separation air outlet 47, and a side separation airflow is blown out from the side separation air outlet 17. Further, an attractive force is generated in the belt hole 56a of the belt unit 51.

Due to the main floating air current and the side floating air current, the uppermost sheets of paper P among the sheets P on the paper feed table 2 float, and the uppermost paper P among the floated sheets P is transferred to the belt unit 51. It is attracted to the conveyance surface 56b.

Here, when the paper P floats up, a side separation airflow is blown out from the side separation air outlet 17 above the uppermost paper P in the vicinity of the side fence 6 . As this side separated airflow flows along the rectifying member 18, a negative pressure state is created between the rectifying member 18 and the uppermost sheet P. As a result, the uppermost sheet P is attracted to the rectifying member 18 and is attracted to the rectifying member 18 . As a result, a side separation airflow flows between the uppermost sheet P and the second sheet P from the top.

On the other hand, on the main separation mechanism section 41 side, after the uppermost sheet P is attracted to the conveyance surface 56b, the main separation airflow blown out from the main separation air outlet 47 transfers the uppermost sheet P attracted to the conveyance surface 56b. Flows toward the upstream side (left side) along.

As a result, between the top sheet P and the second sheet P from the top, the main separation airflow, the side separation airflow from the front side, and the side separation airflow from the rear side collide, as shown in FIG. As shown, positive pressure is generated. The downstream end of the uppermost sheet P pushed up by this positive pressure is pressed by the pressing member 7.

In this state, the control unit 13 controls the shutter 27 and the two shutters 32 to close. Further, the control unit 13 controls the conveyance motor 52 to start driving the belt unit 51 after the shutters 27 and 32 are completely closed.

When the belt unit 51 starts driving, the uppermost sheet P attracted to the transport surface 56b starts to be transported rightward.

Further, by closing the shutters 27 and 32, the main floating airflow from the main floating air outlet 28 and the side floating airflow from the side floating air outlet 16 are stopped. As a result, the positive pressure between the topmost sheet of paper P and the second sheet of paper P from the top pushes down the second and subsequent sheets of paper P from the top, so that the topmost sheet of paper P and the second sheet from the top The following paper P is separated. The second and subsequent sheets of paper P fall onto the paper P remaining on the paper feed table 2.

As described above, while the uppermost sheet P is conveyed by the belt unit 51, the second and subsequent sheets of paper P from the top fall. When the falling of the paper P is completed, the paper P other than the paper P conveyed by the belt unit 51 returns to the state where it is stacked on the paper feed table 2.

After the paper P has finished falling, at a predetermined upper limit detection timing, the control unit 13 determines whether the uppermost paper P among the papers P on the paper feed table 2 is at the upper limit position based on the output signal of the upper limit sensor 12. Decide whether or not. If it is determined that the uppermost sheet P is not at the upper limit position, the control unit 13 raises the paper feed tray 2 until the uppermost sheet P reaches the upper limit position.

Next, the control section 13 stops the belt unit 51 at a predetermined timing after the belt unit 51 starts driving. After that, the control unit 13 opens the shutter 27 and the two shutters 32 in order to feed the next sheet P, and feeds the topmost sheet of sheets P of the sheets P on the sheet feed tray 2. bring to the surface.

By repeating the above operations, the sheets P are sequentially fed from the sheet feeding device 1 to the sheet feeding destination.

As described above, the paper feeding device 1 includes the pressing member 7 that presses the upper surface of the uppermost sheet P floating from the sheets P stacked on the sheet feeding tray 2.

Here, unlike this embodiment, when there is no pressing member 7, the uppermost sheet P is pushed to the rectifying member 18 by the positive pressure generated between the uppermost sheet P and the second sheet P from the top. The uppermost sheet P may be peeled off from the rectifying member 18 due to the swelling between the sheet P and the conveyance surface 56b.

The uppermost sheet P that has been separated from the rectifying member 18 may take a position in which the end portion in the front and back direction is curved downward, as shown in FIG. 7 . When the uppermost sheet P takes the posture shown in FIG. 7, the side separation airflow comes to hit the upper surface side of the uppermost sheet P, and the posture shown in FIG. 7 is fixed. In this state, the side separation airflow is prevented from flowing into the space between the uppermost sheet P and the second sheet P from the top.

As a result, the positive pressure generated when the main separation airflow and the side separation airflow collide in the space between the topmost paper P and the second paper P from the top is reduced, and the It may become impossible to separate the second and subsequent sheets of paper P from the paper P. As a result, paper feeding problems such as double feeding may occur.

On the other hand, in the paper feeding device 1, since the pressing member 7 presses the uppermost sheet P, the uppermost sheet P is prevented from expanding between the rectifying member 18 and the conveying surface 56b. Therefore, the uppermost sheet P is separated from the rectifying member 18 and becomes in a position as shown in FIG. 7, which prevents the side separation airflow from flowing into the space between the uppermost sheet P and the second sheet P from the top. It can be prevented from happening. This makes it possible to reduce separation failure between the top sheet P and the second or lower sheets P from the top.

Further, in the paper feeding device 1, the pressing surface 7a of the pressing member 7 is arranged at the same height position as the transporting surface 56b of the transporting section 11 or at a position higher than the transporting surface 56b. This prevents empty feeding from occurring due to the pressing member 7 preventing the paper P from being attracted to the transport surface 56b. As a result, while suppressing the occurrence of empty feeding, it is possible to reduce separation defects between the uppermost sheet P and the second or lower sheets P from the top.

Here, when the holding surface 7a of the holding member 7 is arranged at a higher position than the conveyance surface 56b, the holding surface 7a may be arranged at a lower position than the designed position due to the influence of component tolerances, etc. However, it is possible to arrange the holding surface 7a at the same height position as the conveying surface 56b or at a position higher than the conveying surface 56b. Therefore, it is possible to prevent the pressing member 7 from interfering with the adsorption of the paper P to the conveying surface 56b.

Note that the holding member 7 may be movable in the front-rear direction (the direction in which the flow regulating member 18 extends). For example, the position of the pressing member 7 in the front and back direction may be adjustable by a drive mechanism having a motor or the like. Thereby, the position of the pressing member 7 in the front and back direction can be adjusted depending on the paper type, paper size, etc. For example, even when the paper size (width) is large, it is possible to prevent the paper P from swelling between the presser member 7 and the transport surface 56b and transport resistance from increasing to the extent that transporting the paper P is hindered, and to The position of the pressing member 7 can be adjusted so as to prevent the paper P from expanding between the paper P and the rectifying member 18 and peeling off from the rectifying member 18 as in the state shown in FIG. 7 .

Further, in the embodiment described above, the holding member 7 is arranged at a position where it presses the downstream end (right end) of the paper P, but the position of the holding member 7 in the left-right direction is not limited to this, and the position of the holding member 7 is not limited to this. Any position that can hold the paper P between it and the transport surface 56b may be used.

Further, as long as the position of the side fence 6 is fixed, the pressing member 7 may extend over the entire area between the flow regulating member 18 and the conveyance surface 56b in the front-rear direction.

Further, the configuration may be such that the floating section 9 is omitted, or the floating section 9 and the main separation mechanism section 41 may be omitted.

The present invention is also applicable to devices that feed sheets other than paper.

The present invention is not limited to the above-described embodiments as they are, but can be embodied by modifying the constituent elements within the scope of the invention at the implementation stage. Moreover, various inventions can be formed by appropriately combining the plurality of components disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiments.

[Additional notes]
This application discloses the following invention.

(Additional note 1)
an air outlet that blows air out from the side of the sheet above the uppermost sheet of the stacked sheets;
a rectifying member extending from above the air outlet to above the end of the sheet;
A sheet feeding device comprising: a pressing member disposed ahead of the tip of the straightening member in the extending direction and pressing the upper surface of the uppermost sheet floating from the stacked sheets.

(Additional note 2)
further comprising a conveyance unit that attracts and conveys the uppermost sheet floating from the stacked sheets to a suction surface,
The pressing member has a pressing surface that presses the upper surface of the uppermost sheet, and the pressing surface is arranged at the same height as the suction surface or at a higher position than the suction surface. The sheet feeding device according to Supplementary Note 1.

(Additional note 3)
The sheet feeding device according to appendix 1 or 2, wherein the holding member is adjustable in position in the extending direction.

1 Paper feeding device 2 Paper feeding table 3 Lifting motor 4 Paper feeding guide plate 5 Sabaki gate 6 Side fence 7 Pressing member 8 End fence 9 Floating section 10 Separating section 11 Conveying section 12 Upper limit sensor 13 Control section 16 Side floating air outlet 17 Side Separation air outlet 18 Rectifying member 21 Main levitation mechanism 22 Side levitation mechanism 26 Main levitation fan 27, 32 Shutter 28 Main levitation air outlet 31 Side levitation fan 41 Main separation mechanism 42 Side separation mechanism 46 Main separation fan 47 Main separation air outlet 48 Side separation fan 51 Belt unit 52 Conveyance motor 53 Chamber 54 Suction fan 56 Conveyance belt 56b Conveyance surface

Claims (4)

an air outlet that blows air out from the side of the sheet above the uppermost sheet of the stacked sheets;
The uppermost sheet extends from above the air outlet to above the edge of the sheet, and the air blown from the air outlet creates a negative pressure between the uppermost sheet and the uppermost sheet, and floats from the stacked sheets. A rectifying member that attracts
By pressing the upper surface of the uppermost sheet that is disposed ahead of the tip of the straightening member in the extending direction and floating from the stacked sheets, the uppermost sheet attracted to the straightening member can straighten the uppermost sheet. A sheet feeding device comprising: a pressing member that suppresses peeling from a sheet member ; further comprising a conveyance unit that attracts and conveys the uppermost sheet floating from the stacked sheets to a suction surface,
The pressing member has a pressing surface that presses the upper surface of the uppermost sheet, and the pressing surface is arranged at the same height as the suction surface or at a higher position than the suction surface. The sheet feeding device according to claim 1. a conveyance unit that conveys the uppermost sheet floating from the stacked sheets;
Disposed below the conveyance unit on the downstream side of the stacked sheets in the sheet conveyance direction by the conveyance unit, and between the uppermost sheet and the second sheet from the top held by the conveyance unit. , further comprising another air outlet that blows out air that collides with the air blown out from the air outlet,
The sheet feeding device according to claim 1, wherein the pressing member is arranged above a downstream end of the stacked sheets in the conveying direction. The sheet feeding device according to any one of claims 1 to 3, wherein the holding member is adjustable in position in the extending direction.