JPH0571500B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a paper feeding device used in image forming apparatuses such as copying machines, printers, and facsimile machines, and feeding laminated sheets such as manuscripts or papers one by one. It is something.

Prior Art As shown in FIG. 8, an air blowing nozzle 05 is arranged in front of the stacked paper 03 of the paper tray 01, and a notch 0 formed in the front of the paper tray 01 is provided.
In the conventional paper feeder in which a vacuum transport 06 as a vacuum delivery device is provided in the paper feeding device 2, air blown from an air blowing nozzle 05 is blown between each sheet of paper from the front edge 04 of the laminated paper 03. The paper 03 is suspended in the air, and only the lowest layer of paper 03a is sucked by the vacuum transport 06 and sent in the paper feeding direction X.

In such a paper feeding device, as shown in FIG. 9, when the laminated paper 03 has a curved curl in the width direction, the portion of the bottom paper 03a that is not sucked into the vacuum transport 06 may curve upward.

Also, when the suction surface of the vacuum transport 06 is located below the paper tray 01, both sides of the paper 03 tend to warp upward.

Problems to be Solved by the Invention If the portion of the bottom layer paper 03a that is not sucked by the vacuum transport 06 warps upward, when the paper is sent out in the paper feeding direction X by the vacuum transport 06, The edge of the upwardly warped portion catches on the air blowing nozzle 05, causing a jam.

Means and Effects for Solving the Problems The present invention relates to an improvement of a paper feeding device that overcomes the above-mentioned difficulties, and includes a stacked sheet storage section for storing stacked sheets, and a stacked sheet storage section in which the stacked sheets are stored in the storage section. a suction/feeding means for sucking the lowest sheet of paper downward and feeding it in the paper feeding direction; and a suction/feeding means located in front of and above the feeding of the laminated sheet for feeding the same laminated sheet. In a sheet feeding device comprising a gas blowing means for blowing gas toward the edge, the suction and feeding means is located near the feeding edge on the bottom surface of the laminated sheet storage section and approximately at the widthwise center of the feeding edge. On the bottom surface of the laminated sheet storage section, the part directly below the suction and delivery means is the lowest, and the part is formed in an inclined shape such that it becomes higher as it moves away from the lowest part in the width direction, and the gas A sheet pressing member is provided adjacent to the air outlet of the spraying means in the width direction and whose lower surface slopes obliquely upward from the lower edge of the air outlet toward the upper side of the sheet. It is something to do.

Since the present invention is configured as described above,
Gas can be blown from the outlet of the gas blowing means toward the delivery edge of the laminated sheets in the laminated sheet storage section to suspend the laminated sheets in the air, and this floating In this state, by operating the suction and delivery means, the bottom sheet of the stacked sheets can be sucked downward and sent out in the paper feeding direction. Even if the portion of the lowermost sheet sucked by the suction/delivery means that deviates laterally from the suction/delivery means is bent toward the information, the outer side portion of the lowermost sheet Since the sheet is guided by the inclined lower surface of the sheet holding member and sent out in the sheet feeding direction, it can be reliably conveyed without jamming.

Further, in the present invention, the suction and feeding means is arranged near the feeding edge on the bottom surface of the laminated sheet storage section and directly below the widthwise center of the feeding edge, and on the bottom surface of the laminated sheet storage section, The portion directly above the suction and delivery means is the lowest, and is formed in an inclined shape such that the height increases as you move away from the lowest portion in the width direction, so that most of the laminated sheets in the laminated sheet storage section are is supported by the bottom surface of the stacked sheet storage section which is located outside the portion directly above the suction and delivery means, and the floating effect of the blown gas from the gas blowing means is stronger in the portion directly above the suction and delivery means. This is facilitated even more smoothly, and it is possible to prevent sheets from being sent out in a stacked state of two or more sheets, and to ensure that sheets are sent out one by one.

Embodiment The present invention will be described below with reference to FIGS. 1 to 7, which are suitable for copying machines.
An embodiment shown in the figure will be described.

The paper set tray 1 is a corner registration type in which paper 9 of sizes from B5 to A2 can be set in the left corner. A cutout 3 is provided in the paper set tray 1 so that the upper part of the perforated belt 12 of the vacuum transport 10 is exposed adjacent to the paper feed edge 2, and is located to the left of the center of the width of the paper set tray 1. The paper set tray 1 is formed in the shape of a hollow dish so that the support surfaces 5 on both sides are located at the highest level via the sloped surface 4 that is inclined upward from the lowest notch 3. When placed in a stacked manner, most of the weight is supported by the inclined surface 4 and both side support surfaces 5.

Further, a guide groove 7 oriented in the paper feeding direction is formed in the tray side plate 6, and a backstop 8 is provided so as to be movable and adjustable in the paper feeding direction while being guided by the guide groove 7. The backstop 8 is adjusted accordingly.

Furthermore, the vacuum transport 10 includes:
Two pairs of transfer rolls 11, perforated belts 12 each spanning the transfer rolls 11, and a vacuum manifold 13 located inside the perforated belt 12 and provided with a large number of suction holes 14 on the upper surface. , a protrusion 15 that is located between the left and right perforated belts 12 and raises the center portion of the paper 9 upward; and a suction fan 17 whose suction portion is communicated with the vacuum manifold 13 via a suction duct 16. It's getting more familiar.

Furthermore, a flying manifold 1 of the air blowing device 18 is located in front of and above the paper delivery edge 2 of the paper set tray 1.
9 is arranged, and the air blowing device 18 has ten nozzles 20 and 21 arranged at a predetermined interval in the width direction of the tray. 20 is low;
The nozzle 21 located to the right is located higher than that.

Moreover, the flying manifold 19 is connected to the discharge side of the blowing fan 22 via a duct (not shown).

Further, seven paper presser guide members 23 protruding toward the paper set tray 1 are arranged in the flying manifold 19 at predetermined intervals in the width direction, and the lower guide surface 24 of the synchronized paper presser guide member 23 is The delivery side transfer roll 1 of the vacuum transport 10 from above the cut tray 1
It is inclined downwardly towards 1.

Furthermore, a paper alignment member 25 is arranged at the center of each width of the left and right perforated belts 12, and when the paper 9 is stored in the paper set tray 1, the feeding edge of the paper 9 is placed in the upright position of the paper alignment member 25. It abuts the surface 26 so that its delivery edges are aligned.

Furthermore, a pair of upper and lower conveyance rolls 27 is provided on the paper sending side of the vacuum transport 10 and the flying manifold 19, and a paper guide 28 is stretched from the upper surface of the perforated belt 12 to the lower conveyance rolls 27. At the same time, a paper guide 29 is stretched parallel to the paper guide 28 from the transport roll 27 in the sending direction side,
When the delivery edge of the paper 9 approaches the transport roll 27, the suction fan 17 is automatically stopped by a sensor (not shown).

Since the embodiment shown in FIGS. 1 to 7 is constructed as described above, the stacked paper 9 is moved to the left side of the paper set tray 1 and placed on the same paper set tray 1, and the backstop 8 is opened by blowing air. When the sheet 9 is moved toward the attaching device 18 and the feeding edge of the sheet 9 collides with the sheet aligning member 25, and the blowing fan 22 of the air blowing device 18 is operated, the nozzle 20,
Air is blown out from 21 toward the delivery edge of the paper 9, and the stacked paper 9 is lifted into a floating state by this blown air.

In this floating state, when the suction fan 17 of the vacuum transport 10 is operated and the transfer roll 11 is rotated, the laminated paper 9
Among them, only the lowest layer of paper 9 is sucked by the perforated belt 12 and transferred toward the suction fan 17 as the transfer roll 11 rotates, and when the leading edge of the lowest layer of paper 9 reaches the conveyance roll 27. , the transfer roll 11 and the suction fan 17 are stopped, and only the bottom layer paper 9 is moved to the paper guide 2 by the transport roll 27.
8 and 29, and is conveyed to a transfer section of a copying machine (not shown).

When the paper 9 is transported, the upper surface of the perforated belt 12 of the vacuum transport 10 is located below the both side support surfaces 5 of the paper set tray 1,
Since the bottom layer of paper 9 is sucked onto the upper surface of the perforated belt 12, even if both sides of the bottom layer of paper 9 curve upward, the delivery edge of the bottom layer of paper 9 will not touch the end surface of the flying manifold 19. without contact,
The pair of upper and lower transport rolls 27 are pushed down by the guide surface 24 of the paper holding guide member 23.
Since it is guided smoothly, jams are prevented from occurring.

In addition, since the protrusion 15 is protruded at the center of the width direction of the vacuum manifold 13, the part of the paper 9 directly above this protrusion 15 is curved toward the information, and air is formed between the stacked papers 9. The stacked paper 9 is sufficiently supplied and flowed backward, and the laminated paper 9 is lifted up into a floating state by the air over the entire surface, and the frictional force between the paper sheets 9 is reduced so that the paper 9 can be smoothly conveyed.

Furthermore, since the paper presser guide member 23 is located directly above the protrusion 15, even if the lowermost sheet 9 is bent upward by the protrusion 15, the guide surface 23 of the paper presser guide member 23 Therefore, the flying manifold 19 is reliably transported without colliding with the end face thereof.

Furthermore, since both sides of the stacked paper 9 are supported by the support surfaces 5 on both sides of the paper set tray 1, the paper 9
are stably supported and the nozzles 20, 21
Even with a relatively small amount of blown air, the floating state can be efficiently set.

[Brief explanation of the drawing]

FIG. 1 is a side view illustrating an embodiment of the paper feeding device according to the present invention, FIG. 2 is a plan view thereof, FIG. - line, V-V line and - in Figures 2 and 7
A cross-sectional side view cut along the line, Figure 7 is the second
4, FIG. 8 is a perspective view of a conventional paper feeding device, and FIG. 9 is a perspective view of a case in which the laminated paper has a tendency to curl. DESCRIPTION OF SYMBOLS 1... Paper set tray, 2... Paper delivery edge, 3... Notch, 4... Inclined surface, 5... Both side support surfaces, 6... Tray side plate, 7... Guide groove, 8...
... Backstop, 9 ... Paper, 10 ... Vacuum transport, 11 ... Transfer roll, 12
... Perforated belt, 13 ... Vacuum manifold, 14 ... Suction hole, 15 ... Projection, 16 ... Suction duct, 17 ... Suction fan, 18 ... Air blowing device, 19 ... Flying manifold ,2
0, 21...Nozzle, 22...Blowout fan, 2
3...Paper presser guide member, 24...Guide surface,
25... Paper alignment member, 26... Upright surface, 27...
...Conveyance roll, 28, 29...Paper guide.

Claims (1)

[Claims] 1 a laminated sheet storage section that stores laminated sheets;
a suction/feeding means for sucking the lowest sheet of the laminated sheets in the storage section downward and sending it out in the paper feeding direction; and a gas blowing means for blowing gas toward the delivery edge of the sheet, wherein the suction and delivery means is located near the delivery edge on the bottom surface of the laminated sheet storage section and at the delivery edge of the sheet. Located directly below the widthwise center of the edge, on the bottom surface of the laminated sheet storage section,
A portion directly below the suction/delivery means is the lowest, and is formed in an inclined shape such that it becomes higher as it moves away from the lowest portion in the width direction. A sheet feeding device characterized in that a sheet pressing member is provided, the lower surface of which is inclined obliquely upward from the lower edge of the sheet toward the upper side of the sheet.