JP2023155972A - Paper feeder, and paper feeding method - Google Patents

Abstract

To provide a paper feeder capable of feeding paper piece by piece even when paper to be fed is thin paper.SOLUTION: A paper feeder 100 of the present invention is provided with: a paper feeding table 11 loading paper X; a guide plate 2 vertically installed on the paper feeding table 11 and abutting to a front edge of the loaded paper X; a back guide 3 having an abutment surface 31 abutting to a rear edge of the loaded paper X; a sucking hole 12 sucking the paper X downward; a sucking pump supplying negative pressure to the sucking hole 12; a paper feeding roll 13 moving the paper X forward or rearward in a paper feeding direction; a support hook 5 supporting a lower edge of a front side of a bundle of the stacked paper X in a state where it is separated from the paper feeding table 11; and a paper rear edge receiving part 32 provided between a lower edge of the abutment surface 31 and the paper feeding table 11. The rear edge of paper in the lowest layer is retreated and then advanced so as to be received in the paper rear edge receiving part 32 as sucking the paper in the lowest layer of the loaded paper using the sucking pump.SELECTED DRAWING: Figure 1

Description

The present invention relates to a paper feeding device and a paper feeding method for feeding paper materials one by one to a printing device, a punching device, etc., and particularly relates to a paper feeding device and a paper feeding method for feeding thin paper.

Conventionally, as a paper feeding device that feeds paper to a printing machine, etc., paper materials are stacked one by one from the bottom with the downstream edge touching a guide plate vertically installed on a paper feeding table, and a roller is used to feed paper materials one by one from the bottom. A paper feeding device that feeds paper in a conventional manner is widely used (for example, see Patent Document 1).

The paper feeding device 9 (see FIG. 6) of Patent Document 1 feeds thick paper X such as a cardboard sheet, and feeds the lowest layer paper X1 of the thick paper X stacked between the guide plate 902 and the back guide 905. While being sucked downward by a suction hole 12 provided in the paper table 11, the paper feed roll 13 flows downstream through the gap 22 between the paper feed table 11 and the guide plate 902.

Japanese Patent Application Publication No. 2016-055071

However, in the paper feeding device 9 of Patent Document 1, the height of the gap 22 is adjusted so that only one sheet of thick paper The problem is that it is difficult to increase the height.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a paper feeding device that can separate and feed sheets of paper one by one even if they are thin.

The invention made to solve the above problem is a paper feeding device that feeds stacked papers in order from the bottom with the thickness direction in the vertical direction, and includes a paper feeding table on which the paper is stacked, and a top surface of the paper feeding table. a guide plate that is vertically disposed on the board and comes into contact with the leading edge of the stacked papers; a back guide that has a contact surface that comes into contact with the trailing edge of the stacked papers; and a suction hole that sucks the papers downward. a suction pump that supplies negative pressure to the suction hole; a paper feed conveyor consisting of a paper feed roll or a belt conveyor that moves the paper forward or backward in the paper feeding direction; and a rotation drive for the paper feed conveyor. a servo motor that supports the front lower edge of the stacked stack of papers in a state separated from the paper feed table; a paper trailing edge accommodating section including a gap provided therein; and a control section for controlling the servo motor and the suction pump; At the same time, the servo motor and the suction pump are controlled so that the trailing edge of the lowest layer paper is accommodated in the paper trailing edge accommodating portion and then moved forward.

In the paper feeding device according to the present invention, the lower edge of the front side of the bundle of stacked papers is supported by the support piece so as to be spaced apart from the paper feeding table, and the lowest layer paper among the stacked papers is Since the paper is moved backward while being sucked downward and then moved forward, even if the paper is thin, it can be separated and fed one by one, and it is possible to prevent multiple sheets from being erroneously fed.

In the paper feeding device of the present invention, the back guide has a trailing surface provided at the rear of the paper trailing edge accommodating section, and the control section brings the lowest layer paper sent rearward into contact with the trailing surface. After that, it is preferable to control the servo motor so as to feed the lowest layer paper forward in the paper feeding direction.
In this way, a trailing surface is provided at the rear of the paper trailing edge accommodating section, and after the bottom layer paper fed backward is brought into contact with the trailing surface, the bottom layer paper is fed forward in the paper feeding direction. By doing so, it is possible to accurately align the intervals in the conveyance direction of the sheets to be fed.

Preferably, the support piece has a downwardly inclined tip. This makes it easier for the fed paper to slip out backwards.

It is preferable that the angle θ between the upper surface of the support piece and the guide surface of the guide plate that abuts the front edge of the paper is 80 degrees or more and 100 degrees or less. By doing this, it is possible to suppress the stacked papers from coming apart.

The present invention is a paper feeding method that uses a paper feeding device to feed sheets stacked with the thickness direction up and down in order from the bottom. a guide plate that is vertically disposed above a paper table and comes into contact with the leading edge of the stacked papers; a back guide that has a contact surface that comes into contact with the trailing edge of the stacked papers; and a back guide that sucks the papers downward. a suction hole for supplying negative pressure to the suction hole; a servo motor capable of moving the paper back and forth in the paper feeding direction; and a suction pump for supplying negative pressure to the suction hole; a support piece that supports the paper table while being spaced apart from the paper table; and a paper trailing edge accommodating section that includes a gap provided between the lower end of the abutment surface of the back guide and the paper feed table; The method includes a paper feeding method characterized in that the lowermost layer paper is sucked by the suction hole while the lowermost layer paper is retreated so that the trailing edge of the stacked papers is accommodated in the paper trailing edge accommodating section. .

In the paper feeding method of the present invention, the paper feeding device has a back guide provided at the rear of the paper trailing edge accommodating section, and the lowermost layer paper fed rearward by the servo motor is It is preferable that the lowermost layer paper is conveyed forward in the paper feeding direction by the servo motor after it is brought into contact with the rear collision surface.

As explained above, according to the paper feeding device and the paper feeding method of the present invention, even thin paper can be separated and fed one by one. transmission can be suppressed.

FIG. 1 is a side view showing a paper feeding device according to an embodiment of the present invention in use. FIG. 2 is an enlarged front view of main parts showing the lower end of the guide plate in FIG. 1; FIG. 2 is an enlarged side view of a main part showing the lower end of the guide plate in FIG. 1; FIG. 2 is an enlarged side view of a main part showing the vicinity of a guide surface of the back guide in FIG. 1; 2 is an explanatory diagram showing how paper is fed in the paper feeding device of FIG. 1. FIG. FIG. 2 is a side view showing a conventional paper feeding device.

Embodiments of the present invention will be described in detail below using appropriate drawings. However, the present invention is not limited to the following embodiments.

FIG. 1 shows a paper feeding device 100 according to a first embodiment of the present invention. The paper feeding device 100 is used to feed paper X stacked with the thickness direction in the vertical direction from the bottom to the next process device such as a printing machine or a punching device. and a back guide 3. The symbol Y in FIG. 1 is a conveyor that conveys the paper X to the next process device.

The paper feeding device main body 1 includes a horizontal plate-shaped paper feeding table 11, a suction hole 12 that sucks the paper X to be fed downward, and a suction pump (not shown) that supplies negative pressure to the suction hole 12. Paper feed rolls (paper feed conveyors) 13, 13, ... that move the paper X forward or backward in the paper feeding direction, a servo motor (not shown) that rotationally drives the paper feed rolls 13, 13, ..., and a control system. (not shown), and is configured to flow the paper X stacked on the upper surface 11a of the paper feeding table 11 back and forth in the paper feeding direction.

As shown in FIGS. 2 and 3, the guide plate 2 has a long plate shape, and extends from the horizontal bar 4 that traverses the top of the paper feed table to the upper surface 1a of the paper feed table 11 in the thickness direction in the paper feed direction ( It is suspended in the depth direction in Fig. 2). A guide surface 21 whose upper side is inclined toward the upstream side in the paper feeding direction is provided on the surface of the lower end of the guide plate 2 on the upstream side in the paper feeding direction (the front side of the paper in FIG. 2, the right side in FIG. 3). There is.

As shown in FIG. 2, two guide plates 2 are provided at intervals in the width direction of the paper feed table 11. A paper feed gap 22 consisting of a gap is provided so as to be changeable as appropriate depending on the size and thickness of the paper X. The guide plate 2 includes a pair of left and right support hooks 5, 5 that support the front lower edge Xc of the stacked bundle of papers X in a state separated from the paper feed table 11.

As shown in FIGS. 2 and 3, the support hook 5 is screwed to the inner side surface of the guide plate 2 via a sliding plate 6. The support hook 5 has an L-shape formed by bending a plate material, has a vertical portion 51 and a support piece 52 that is bent forward with respect to the vertical portion 51, and is slidable by a screw allowance 53 that is bent at a right angle from the side of the vertical portion 51. It is fixed to the plate 6.

The sliding plate 6 is fixed to the side surface of the guide plate 2 with hexagon socket bolts 62 through elongated holes 61 that extend vertically. The support hook 5 adjusts the height of the support piece 52 from the paper feed table 11 by loosening the hexagon socket bolt 62 and sliding the sliding plate 6 up and down. The upper surface 52a of the support piece 52 is preferably inclined so that the tip thereof is downward, and it is particularly preferable that the angle θ between the support piece 52 and the guide surface 21 is 80 degrees or more and 100 degrees or less. This makes it easier for paper X to come out backwards.

As shown in FIG. 4, the back guide 3 includes a contact surface 31 that comes into contact with the trailing edge of the stacked papers It includes a rear end surface 33 provided at the rear of the paper trailing edge accommodating section 32, a hook 34 for lifting the trailing edge Xb of the stacked bundle of papers X, and a hand crank 35 (see FIG. 1). The contact surface 31 is provided so as to be movable back and forth by a hand-cranked handle 35. The contact surface 31 is provided so that its upper side is inclined rearward so as to be substantially parallel to the guide surface 21 of the guide plate 2, and the magnitude of the inclination can be changed.

When using the paper feeding device 100, as shown in FIG. 5(a), first, the leading edge Xa of the bundle of papers At the same time, the lower edge Xc of the front side is placed on the support piece 52 of the support hook 5, and it is loaded between the guide plate 2 and the back guide 3.

When the paper feeding device 100 is operated to start feeding paper in this state, the suction pump is operated and the bottom layer paper X1 of the stacked papers At the same time, the servo motor is operated to rotate the paper feed roll 13 backwards and pull out the lowest layer paper X1 backwards. The lowermost paper X1 that has been pulled out has its leading edge X1a separated from the support piece 52, retreats so that its trailing edge X1b is accommodated in the paper trailing edge accommodating portion 32, and then collides with the rear end surface 33. The suction pump continues to suck paper X at a constant pressure from the start of paper feeding until the paper feeding is completed.

When the bottom layer paper X1 collides with the collision surface 33, as shown in FIG. It is transferred to the conveyor Y on the downstream side through the gap 22.

As described above, the paper feeding device and the paper feeding method of the present invention are not limited to the embodiments described above. For example, the number of supporting pieces is not limited to two, but may be one, three or more. It is not necessary to provide a rear collision surface on the back guide. The paper feed conveyor is not limited to a paper feed roller, but may be a belt conveyor made of an endless annular belt. The tip of the support piece does not need to be inclined downward, and the angle with the guide surface may be less than 80 degrees or more than 100 degrees. The guide surface does not need to be inclined.

100 Paper feeding device 11 Paper feeding table 12 Suction hole 13 Paper feeding roll (paper feeding conveyor)
2 Guide plate 22 Gap 3 Back guide 31 Contact surface 32 Paper trailing edge accommodating section 33 Rear end surface 52 Support piece 52a Top surface X Paper X1 Bottom layer paper X1b Trailing edge Xc Lower edge

The present invention is a paper feeding method that uses a paper feeding device to feed sheets stacked with the thickness direction up and down in order from the bottom. a guide plate that is vertically disposed above a paper table and comes into contact with the leading edge of the stacked papers; a back guide that has a contact surface that comes into contact with the trailing edge of the stacked papers; and a back guide that sucks the papers downward. a suction hole that supplies negative pressure to the suction hole, a suction pump that supplies negative pressure to the suction hole, a paper feed conveyor consisting of a paper feed roll or a belt conveyor that moves the paper forward or backward in the paper feeding direction, and the paper feed conveyor a servo motor that rotationally drives the stacked paper bundle, a support piece that supports the lower edge of the front side of the stacked stack of paper in a state separated from the paper feed table, and a lower end of the contact surface of the back guide and the paper feed table. and a paper trailing edge accommodating section consisting of a gap provided between the stacked papers . The paper feeding method includes the step of retracting the lowest layer paper so that it is stored in a paper trailing edge storage section and then advancing it .

Unexamined Japanese Patent Publication No. 2016-50071

Claims (6)

A paper feeding device that feeds stacked papers in order from the bottom with the thickness direction facing up and down,
A paper feed table for loading paper,
a guide plate that is vertically disposed above the paper feed table and comes into contact with the front edge of the stacked papers;
a back guide having a contact surface that contacts the trailing edge of the stacked papers;
a suction hole that sucks the paper downward;
a suction pump that supplies negative pressure to the suction hole;
a paper feed conveyor consisting of a paper feed roll or a belt conveyor that moves the paper forward or backward in the paper feeding direction;
a servo motor that rotationally drives the paper feed conveyor;
a support piece that supports the lower edge of the front side of the stacked bundle of papers in a state separated from the paper feed table;
a paper trailing edge accommodating portion consisting of a gap provided between the lower end of the contact surface of the back guide and the paper feed table;
comprising the servo motor and a control unit that controls the suction pump,
The control unit is configured to move the lowermost layer of the stacked papers while sucking the lowermost layer of the paper using the suction pump, to move the lowermost layer of paper backward so that the trailing edge of the lowest layer of paper is accommodated in the paper trailing edge accommodating portion, and then to move it forward. A paper feeding device that controls the servo motor and the suction pump. The back guide has a rear end surface provided at the rear of the paper trailing edge accommodating section,
2. The control unit controls the servo motor to cause the bottom layer paper sent backward to come into contact with the rear collision surface, and then to feed the bottom layer paper forward in the paper feeding direction. paper feed device. The paper feeding device according to claim 1, wherein the support piece has a tip inclined downward. The paper feeding device according to claim 1, wherein an angle θ between the upper surface of the support piece and a guide surface of the guide plate that abuts the front edge of the paper is 80 degrees or more and 100 degrees or less. A paper feeding method that uses a paper feeding device to sequentially feed stacked sheets of paper with the thickness direction in the vertical direction from the bottom,
The paper feeding device includes a paper feeding table on which paper is stacked, a guide plate that is vertically disposed above the paper feeding table and contacts the front edge of the stacked paper, and a guide plate that contacts the trailing edge of the stacked paper. A back guide having a contact surface that abuts, a suction hole that sucks the paper downward, a suction pump that supplies negative pressure to the suction hole, and a feeder that moves the paper forward or backward in the paper feeding direction. A paper feed conveyor consisting of a paper roll or a belt conveyor, a servo motor that rotationally drives the paper feed conveyor, and a support that supports the front lower edge of the stacked stack of papers in a state separated from the paper feed table. a paper trailing edge accommodating portion comprising a gap provided between the lower end of the contact surface of the back guide and the paper feed table;
The feeder is characterized in that the lowermost layer of paper is sucked by the suction hole while the lowermost layer of paper is retreated so that the trailing edge of the loaded paper is accommodated in the paper trailing edge accommodating section by the servo motor. paper method. The paper feeding device includes a rear guide in which the back guide has a trailing surface provided at the rear of the paper trailing edge accommodating section, and after the bottom layer paper sent rearward by the servo motor comes into contact with the trailing surface, 6. The paper feeding method according to claim 5, wherein the lowermost layer paper is fed forward in the paper feeding direction by the servo motor.

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