JPS6216944A - Paper feed device - Google Patents

Abstract

PURPOSE:To surely prevent paper sheets from being fed in an overlapped condition, by floating up a paper sheet with the use of air from first air nozzles to convey the paper by means of a conveyer belt having absorbing holes, and by blowing air from second air nozzles into a gap between paper sheets. CONSTITUTION:A conveyor belt 32 having absorbing holes and positioned directly above paper sheets 2 sucks up the topmost one of the paper sheets 2 and conveys it. An suction air dust 36 is connected at its downstream side to an air box 48 through a jet air duct 38, and jet from first air nozzles 49 blows onto the upper end part of the paper sheet 2 to raise the latter, and jet air from second air nozzles 50 impinges upon an air stream deflecting plate 51 inclined by an angle of alpha with respect to the upper surface of the paper sheet 2. The paper sheet 2 on conveyance is deformed when it comes to a convex section, and when it is further conveyed, an air stream from the second air nozzle is blown onto the bent section of the paper sheet, and therefore, even if another paper sheet is fed overlapped with the former paper sheet, the another paper sheet may be separated by air fed into the gap between the sheets.

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD OF THE INVENTION The present invention relates to a paper feeder that takes out sheets stacked on a paper feeder in order from the topmost one and supplies them to a copying machine, facsimile machine, or the like. 2. Description of the Related Art Conventional paper feeding devices are known to take out a large number of sheets of paper stacked on a paper feeding tray F one by one, starting from the top sheet B, and feed them into a copying machine or the like. It is being However, due to the nature of the paper, it is not possible to separate and feed the paper one by one.
For example, in the case of paper that is frayed by shearing or that is charged with static electricity, the separating action of the paper is insufficient, and paper feed often occurs. In order to eliminate such m-feeding of sheets, the applicant has proposed a so-called bottom feed feeding M1 device as shown in FIGS. 5 and 6, for example. According to this device, a large number of sheets 2 are placed on a pick-up tray 1, and a bottom feed sheet feeding device 3 is provided on the rear side of this sheet feeding tray 1. The paper 2 is rotated counterclockwise in the figure of the conveyor belt 5 wound around the drive roll 4a and the driven roll 4b.
The lowest sheet of paper 2a is conveyed to the left in the figure. Specifically, a vacuum box 6 that generates negative pressure inside by a vacuum fan (not shown) is provided between the conveyor belts 5, and a protrusion that contacts the lowest sheet 221 is provided on the top surface of the bar 1 new box 6. A portion 7 is formed. On the rear side of this protrusion 7, as shown in FIG. 6, a suction port 8 is formed to suck the lowest paper 2a.
As shown in the figure, the leading edge of the lowest paper 2a is bent,
A gap 10 is formed between the sheet 2b and the sheet 2b immediately above it. Due to the function of this gap 10, 2
The lowest sheet 2a is separated from the th sheet 2b so that the sheets can be reliably fed out one by one. The present applicant has proposed an apparatus to which this bottom-feed type paper feeding apparatus is applied, as shown in FIGS. 7 and 8 (Japanese Patent Application No. 1983-020900). To explain this paper feeding device, the sheet 18 to be conveyed is conveyed to the left on the lower surface of a conveyor belt 17 wound around a drive roll 15 and a slave roller 16. At this time, a vacuum box is interposed between the slack side and the tension side of the conveyor belt 17, and a negative pressure is generated in the suction 1] 20 formed in large numbers on the stone surface of the vacuum box 19. The paper 18 is transferred to the conveyor belt 1-1 by negative pressure.
7 and conveys the paper 18 in the direction of belt movement. An air box 21 is provided on the F side of the rear side of the conveyor bells 1 to 17, and this air box 21 supplies suctioned air through a passage (not shown) to generate negative pressure in the vacuum box 19. A first air nozzle 22 and a second air nozzle group 23 provided in the air nozzle 21 blow air in predetermined directions, respectively. The first air nozzle group 22 is for levitating the uppermost sheet of the paper feed 1 to tray (not shown), and the second air nozzle group 23 is for levitating the uppermost sheet of paper that has been levitated and adsorbed to the lower surface of the conveyor belt 17. In order to separate the paper 18 and the paper immediately below it (not shown), an air flow is blown between the two papers to separate them. Problems to be Solved by the Invention However, in this conventional paper feeding device, as shown in FIG. As shown in FIG.
There was a problem in that the leading edge of the paper 18 would be caught in the second air nozzle group 13 and the like, causing a paper jam. The present invention has been made to solve these conventional problems, and uses a suction means to reliably separate the paper adsorbed to the lower surface of the conveyor belt from the paper below it, thereby eliminating paper jams. The purpose is to prevent double feeding. Means for Solving the Problems In order to achieve the object of the present invention, the paper feeding device of the present invention includes a suction means for sucking the uppermost sheet of the sheets stacked on the sheet feeding tray; a first air nozzle group that levitates the uppermost sheet of paper to a position where it can be sucked by the suction means; Consisting of a second air nozzle group for blowing air between sheets of paper, and an air flow impingement wall having a slope inclined with respect to the lower surface of the stacked sheets so as to switch the direction of air flow from the second nozzle group. A convex portion is provided in the rough part to deflect the paper sucked by the suction means, and the convex portion is positioned forward of the point where the air flow from the second air nozzle group collides with the air flow collision wall. A suction port for sucking the paper is opened in the vicinity of both sides of the convex portion or in a portion over the convex portion. Function According to the present invention, the suction means sucks the uppermost paper on the paper feed i~, the conveyance means conveys the suctioned paper in a predetermined direction, and when the paper reaches the position of the convex portion, the The paper becomes warped. When the sheet of paper bent by the convex portion is further conveyed to the rear side by the conveying means, the air flow from the second air nozzle group is blown against the bent portion of the sheet of paper, and the paper immediately below the sheet of paper is then double fed. Even if it is, there is a gap between the bent part of the top sheet and the sheet just below it, so
Air flow enters this gap to separate the topmost sheet from the sheets immediately below it. Therefore, only the uppermost sheet of paper can be conveyed in a predetermined direction by the conveying means while being sucked by the suction means, and thereby the sheets can be separated one by one and conveyed one by one in the predetermined direction. Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. FIG. 1 shows a schematic configuration of one embodiment of the present invention, and FIG.
The figure is a hailstone as seen from the direction of the l-ff1 line in Fig. 1. A paper guide plate 35 for positioning the stacked papers 2 is provided above the paper feeder 1 to the tray 40. Directly above the stacked sheets 2 is a conveyor belt 3 which rotates in the direction of the arrow in FIG.
2 is wound. The transport bells 1 to 32 are provided with suction ports (not shown), and negative pressure is generated near the suction ports by the suction action of air from the vacuum box 35. The upstream side of the intake duct 36 connected to the vacuum box 35 is connected to a vacuum fan 37, and the downstream side thereof is connected to an air box 48 via a fume duct 38. There is a conveyor bell 1 in the middle of the intake duct 36.
- 32 are provided with a vacuum valve 46 for suctioning the uppermost sheet, and on the downstream side thereof, a relief valve 47 is provided for supplying air to a first air nozzle group 49 and a second air nozzle group 50, which will be described later. There is. The first air nozzle group 49 is attached to the air box 48 so that the ejected air hits the upper part of the leading edge of the sheets 2 being deposited. The second air nozzle group 50 is attached to the air box 48 so as to blow air toward an air flow collision plate (air flow collision wall) 51 provided at an angle α with respect to the upper surface of the paper 2. . More specifically, the first air nozzle group 49 generates an air flow that is almost parallel to the sheets stacked on the paper feed trays 1 to 40, and lifts up the uppermost sheets. The first and second air nozzle groups 50, which move the paper to a position where it can be sucked onto the conveyor belt 32, blow an air flow between the topmost sucked paper and the paper just below it. This is designed to ensure the separation of both sheets. Although not shown here, there are three

[J] The second air nozzles if 50 are oriented in the direction in which the ejected air from each other is concentrated, and when these air nozzle jets collide with the air flow collision plate 51, the uppermost sheet and the sheet immediately below it are This creates stagnant pressure between the uppermost sheet of paper and the sheet of paper below it, which cancels out the attraction force due to static electricity between the uppermost sheet of paper and the sheet of paper below it, increasing the separation effect between the two sheets. A "plate 61" shown in FIG. 2 that forms the plate 51 and the vacuum hook 35 is integrally constructed, and a convex portion 62 is formed in a part of the paper suction area of the plate 61.
form. This convex portion 62 is located forward (to the right in FIG. 1, downward in FIG. 2) of the point where the air flow from the second air nozzle group 50 collides with the air flow collision plate 51. It is formed. In addition, the height of the convex portion 62 is set to increase the separation effect between the uppermost sheet of paper sucked to the lower surface of the conveyor belt 32 and the sheet immediately below it, and to prevent problems in suction when the sheet is thick. For example, it is desirable to project downward from the belt surface of the conveyor belt 32 within a range of 2 to 3 #W.
□As roughly shown in Figure 2, the plate 61 has
Air is drawn through suction holes formed in the conveyor belt 32.
A plurality of suction ports 63 are formed to suck □, and the front
□A pair of suction ports 64 are formed near both sides of the convex portion 62 or in a portion overlapping the convex portion 62. The uppermost sheet of paper attracted to the conveyor belt 32 is conveyed in the direction of arrow B shown in FIG. . Furthermore, a 7-queuator 53 is installed on the paper feed tray 40 to detect the height of the paper stacked on the JfC.
When the paper is consumed and its height becomes lower, a switch (not shown) is turned on due to the hard work of the accu-tater 53, and at the same time, a tray motor (not shown) rotates to feed paper from i to 0 to a predetermined position. It is designed so that the upper limit is up to the position. After that, the paper feed tray 40 is placed in the predetermined position 1', and reaches 1J.
Then, since the actuator 536 is on the upper side, the switch is turned off and the paper feed I/ray 40 is stopped at that position by moving one hew one turn. Next, the operation of this embodiment will be explained. First, the vacuum valve 46 is in the closed state, and the relief valve 47 is in the circular fg
, when the vacuum fan 37 is driven, air is supplied to the -LA box 48 via the relief valve 47 and the blower duct 1-38, and air is supplied from the 11th nozzle group 49 and the 2nd air nozzle group 50, respectively. A jet stream is ejected in a predetermined direction. The air from the 1st]-Anosle group 49] is
40-1-x, the air supplied from the other second air nozzle group 50 hits the air flow jetting machine 51, and the air is applied to the uppermost part of the sheets 2 stacked on the top sheet 40-1-x. The paper is fed so as to create stagnation pressure between the sheets immediately below the slot. Therefore, among the sheets placed in the paper feed tray 40, the lower sheets are lifted 7゛y by the first air nozzle 49, and the uppermost sheet is 11 times.
It is measured by the second air nozzle group 50 so that the paper directly below the nozzle and the minute #[1]. When the valve 46 is closed and the relief valve 47 is closed, the valve 46 is closed and the relief valve 47 is closed. Due to the action of the pump 37, a negative n- is generated in the vacuum box 35 through the fume ducts 1 to 36, and this negative pressure is generated in the suction hole (not shown) formed in the conveyor belt 1 at 32, and as a result, the conveyor belt 3
At 20, suck up the Ia 10 paper. At this moment, when the paper is WI-fed to the position of the convex part 62 by the conveyor belt 32, the topmost paper is squeezed by the convex part 62, and
The paper immediately below it does not bend that much, so
h] A gap is created between the leading edge of the upper sheet of paper and the leading edge of the sheet immediately below the groove, and the 21st nozzle 8r50 is inserted into this gap.
An air flow from the paper enters and is timed to separate these sheets. In this case, due to the negative pressure generated in the suction port 64, the bending of the leading edge of the highest sheet of paper becomes larger, so the gap becomes larger and the pH function with respect to the lower sheet of paper becomes stronger. Demonstrated. Incidentally, when the negative pressure in the intake air 1-36 rises above a predetermined value, the relief valve 47 is opened. When a predetermined period of time has elapsed after the vacuum valve 4G was switched from the closed state to the closed state, a clutch (not shown) connected to a drive source (not shown) is turned on and driven, rotating the -ru 34 in the direction of the arrow. The transport bell l-32 is driven in the direction of arrow 8. The paper transported by the transport belt 32 passes through the first tray 52 via transport rolls 42 and 43. When the photo sensor 52 detects the leading edge of the paper, the clutch is turned off to stop the operation of the drive roll 34, and the vacuum valve 46 is closed. As a result, the paper that had been attracted until then is peeled off from the conveyor belt 32, and the conveyor rolls 42 and 43 are rotated to supply the paper to a platen glass (not shown) of a copying machine, for example. In this case, since a pair of suction ports 64 for sucking the paper are opened in the vicinity of both sides of the convex portion 62 or in the area over the convex portion, as is clear from a comparison between FIGS. 3 and 4, According to this embodiment, compared to the case of FIG. 4 in which the suction port 64 is not formed, the gap between the uppermost sheet 2C and the lower sheet 2d is larger. second air nozzle group 50
The air flow from the J3
It can be further enhanced. DETAILED DESCRIPTION OF THE INVENTION According to the present invention, when the uppermost sheet of paper adsorbed on the conveyor belt rides on the convex portion, the uppermost sheet of paper and the paper immediately below it are bent due to the bending that occurs at the leading edge of the sheet of paper. By creating a gap between the sheets and actively supplying air flow into this gap, separation of the top sheet from the sheets below it can be reliably achieved, thereby ensuring that the sheets of paper are separated from each other. Clogging and double feeding can be prevented. Therefore, there is an effect that the sheets stacked on the paper feed tray can be separated one by one from the top one and transported without causing a paper jam.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram showing an embodiment of the present invention, Fig. 2 is a view taken along the If-If line in Fig. 1, and Fig. 3 is a sectional view taken along the ■-■ line in Fig. 2. , FIG. 4 is a reference diagram corresponding to FIG. 3 for detailed explanation of the present invention, FIG. 5 is a schematic configuration diagram showing a conventional example, FIG. 6 is a sectional configuration diagram of the main part of FIG. 5, FIG. 7 is a schematic structural diagram of another conventional example, and FIG. 8 is a schematic structural diagram showing the operation of the conventional example shown in FIG. 2...paper, 34...drive 1 call,
35... Bar 1 box, 40... Paper feed tray, 48... Air box,
49... First air nozzle group, 50... Second air nozzle group, 51... Air flow T8 projecting plate, 61... Plate, 6
2... Convex portion, 63... Suction port, 64...
・Suction port.

Claims (1)

[Claims] a suction means for suctioning the uppermost sheet of the sheets stacked on the paper feed tray; a conveying means for transporting the sheet sucked by the suction means; and a suction means capable of sucking the uppermost sheet of paper by the suction means. A first air nozzle group that levitates the paper to a position, a second air nozzle group that blows air between the uppermost paper and the paper below it, and a second air nozzle group that switches the direction of air flow from the second air nozzle group. A sheet feeding device comprising an air flow collision wall having a slope inclined with respect to the upper surface of the sheet, a convex portion for bending the sheet sucked by the suction means, and this convex portion is connected to the second air nozzle group. The paper is formed so that the air flow is located in front of the point where it collides with the air flow collision wall, and a suction port for sucking the paper is opened near both sides of the convex part or in a part over the convex part. Characteristic paper feeding device.